templog: network/uip.c annotate

annotate network/uip.c @ 107:56d09a0969b5 avr-http

Import uIP and the PPP implementation from https://code.google.com/p/avrusbmodem/

author	Matt Johnston <matt@ucc.asn.au>
date	Fri, 07 Sep 2012 23:53:53 +0800
parents
children

rev	line source
107 56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 #define DEBUG_PRINTF(...) /printf(__VA_ARGS__)/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 /**
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 * \addtogroup uip
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 * @{
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 /**
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 * \file
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 * The uIP TCP/IP stack code.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 * \author Adam Dunkels <[email protected]>
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 /*
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 * Copyright (c) 2001-2003, Adam Dunkels.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 * All rights reserved.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 * Redistribution and use in source and binary forms, with or without
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 * modification, are permitted provided that the following conditions
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 * are met:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 * 1. Redistributions of source code must retain the above copyright
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 * notice, this list of conditions and the following disclaimer.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 * 2. Redistributions in binary form must reproduce the above copyright
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24 * notice, this list of conditions and the following disclaimer in the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 * documentation and/or other materials provided with the distribution.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 * 3. The name of the author may not be used to endorse or promote
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 * products derived from this software without specific prior
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 * written permission.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41 *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 * This file is part of the uIP TCP/IP stack.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 * $Id: uip.c,v 1.30 2010/10/19 18:29:04 adamdunkels Exp $
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 /*
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 * uIP is a small implementation of the IP, UDP and TCP protocols (as
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50 * well as some basic ICMP stuff). The implementation couples the IP,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 * UDP, TCP and the application layers very tightly. To keep the size
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 * of the compiled code down, this code frequently uses the goto
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 * statement. While it would be possible to break the uip_process()
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 * function into many smaller functions, this would increase the code
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55 * size because of the overhead of parameter passing and the fact that
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 * the optimier would not be as efficient.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58 * The principle is that we have a small buffer, called the uip_buf,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59 * in which the device driver puts an incoming packet. The TCP/IP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 * stack parses the headers in the packet, and calls the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61 * application. If the remote host has sent data to the application,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 * this data is present in the uip_buf and the application read the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 * data from there. It is up to the application to put this data into
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 * a byte stream if needed. The application will not be fed with data
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 * that is out of sequence.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67 * If the application whishes to send data to the peer, it should put
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	68 * its data into the uip_buf. The uip_appdata pointer points to the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 * first available byte. The TCP/IP stack will calculate the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	70 * checksums, and fill in the necessary header fields and finally send
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71 * the packet back to the peer.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 #include "uip.h"
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 #include "uipopt.h"
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 //#include "net/uip_arp.h"
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 //#include "net/uip_arch.h"
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79 #if !UIP_CONF_IPV6 /* If UIP_CONF_IPV6 is defined, we compile the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 uip6.c file instead of this one. Therefore
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81 this #ifndef removes the entire compilation
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 output of the uip.c file */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	84
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	86 #include "net/uip-neighbor.h"
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	87 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	88
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	89 #include <string.h>
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	92 /* Variable definitions. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	95 /* The IP address of this host. If it is defined to be fixed (by
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 setting UIP_FIXEDADDR to 1 in uipopt.h), the address is set
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97 here. Otherwise, the address */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	98 #if UIP_FIXEDADDR > 0
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99 const uip_ipaddr_t uip_hostaddr =
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	100 { UIP_IPADDR0, UIP_IPADDR1, UIP_IPADDR2, UIP_IPADDR3 };
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 const uip_ipaddr_t uip_draddr =
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102 { UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3 };
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103 const uip_ipaddr_t uip_netmask =
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 { UIP_NETMASK0, UIP_NETMASK1, UIP_NETMASK2, UIP_NETMASK3 };
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105 #else
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 uip_ipaddr_t uip_hostaddr, uip_draddr, uip_netmask;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107 #endif /* UIP_FIXEDADDR */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109 const uip_ipaddr_t uip_broadcast_addr =
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff } };
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 #else /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 { { 0xff, 0xff, 0xff, 0xff } };
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 const uip_ipaddr_t uip_all_zeroes_addr = { { 0x0, /* rest is 0 */ } };
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118 #if UIP_FIXEDETHADDR
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119 const struct uip_eth_addr uip_ethaddr = {{UIP_ETHADDR0,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	120 UIP_ETHADDR1,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121 UIP_ETHADDR2,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122 UIP_ETHADDR3,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123 UIP_ETHADDR4,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	124 UIP_ETHADDR5}};
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 #else
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126 struct uip_eth_addr uip_ethaddr = {{0,0,0,0,0,0}};
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127 #endif
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 /* The packet buffer that contains incoming packets. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	130 uip_buf_t uip_aligned_buf;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132 void uip_appdata; / The uip_appdata pointer points to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133 application data. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	134 void uip_sappdata; / The uip_appdata pointer points to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	135 the application data which is to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	136 be sent. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	137 #if UIP_URGDATA > 0
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	138 void uip_urgdata; / The uip_urgdata pointer points to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	139 urgent data (out-of-band data), if
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	140 present. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	141 u16_t uip_urglen, uip_surglen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 #endif /* UIP_URGDATA > 0 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	144 u16_t uip_len, uip_slen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 /* The uip_len is either 8 or 16 bits,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146 depending on the maximum packet
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147 size. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	148
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	149 u8_t uip_flags; /* The uip_flags variable is used for
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	150 communication between the TCP/IP stack
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	151 and the application program. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	152 struct uip_conn uip_conn; / uip_conn always points to the current
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	153 connection. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	154
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	155 struct uip_conn uip_conns[UIP_CONNS];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	156 /* The uip_conns array holds all TCP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	157 connections. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	158 u16_t uip_listenports[UIP_LISTENPORTS];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159 /* The uip_listenports list all currently
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160 listning ports. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	161 #if UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162 struct uip_udp_conn *uip_udp_conn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163 struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	164 #endif /* UIP_UDP */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	165
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166 static u16_t ipid; /* Ths ipid variable is an increasing
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	167 number that is used for the IP ID
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168 field. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	169
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	170 void uip_setipid(u16_t id) { ipid = id; }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	171
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	172 static u8_t iss[4]; /* The iss variable is used for the TCP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	173 initial sequence number. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	174
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175 #if UIP_ACTIVE_OPEN \|\| UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	176 static u16_t lastport; /* Keeps track of the last port used for
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	177 a new connection. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178 #endif /* UIP_ACTIVE_OPEN \|\| UIP_UDP */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	179
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	180 /* Temporary variables. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	181 u8_t uip_acc32[4];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	182 static u8_t c, opt;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183 static u16_t tmp16;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	184
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	185 /* Structures and definitions. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	186 #define TCP_FIN 0x01
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	187 #define TCP_SYN 0x02
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	188 #define TCP_RST 0x04
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	189 #define TCP_PSH 0x08
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	190 #define TCP_ACK 0x10
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	191 #define TCP_URG 0x20
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	192 #define TCP_CTL 0x3f
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	193
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 #define TCP_OPT_END 0 /* End of TCP options list */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	195 #define TCP_OPT_NOOP 1 /* "No-operation" TCP option */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	196 #define TCP_OPT_MSS 2 /* Maximum segment size TCP option */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	198 #define TCP_OPT_MSS_LEN 4 /* Length of TCP MSS option. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	199
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	200 #define ICMP_ECHO_REPLY 0
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	201 #define ICMP_ECHO 8
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	202
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	203 #define ICMP_DEST_UNREACHABLE 3
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	204 #define ICMP_PORT_UNREACHABLE 3
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	205
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	206 #define ICMP6_ECHO_REPLY 129
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	207 #define ICMP6_ECHO 128
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	208 #define ICMP6_NEIGHBOR_SOLICITATION 135
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	209 #define ICMP6_NEIGHBOR_ADVERTISEMENT 136
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	210
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	211 #define ICMP6_FLAG_S (1 << 6)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	212
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	213 #define ICMP6_OPTION_SOURCE_LINK_ADDRESS 1
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214 #define ICMP6_OPTION_TARGET_LINK_ADDRESS 2
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	215
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	216
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	217 /* Macros. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	218 #define BUF ((struct uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN])
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	219 #define FBUF ((struct uip_tcpip_hdr *)&uip_reassbuf[0])
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	220 #define ICMPBUF ((struct uip_icmpip_hdr *)&uip_buf[UIP_LLH_LEN])
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	221 #define UDPBUF ((struct uip_udpip_hdr *)&uip_buf[UIP_LLH_LEN])
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	222
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	223
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	224 #if UIP_STATISTICS == 1
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	225 struct uip_stats uip_stat;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	226 #define UIP_STAT(s) s
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	227 #else
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	228 #define UIP_STAT(s)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	229 #endif /* UIP_STATISTICS == 1 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	230
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	231 #if UIP_LOGGING == 1
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	232 #include <stdio.h>
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	233 void uip_log(char *msg);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234 #define UIP_LOG(m) uip_log(m)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235 #else
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236 #define UIP_LOG(m)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237 #endif /* UIP_LOGGING == 1 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239 #if ! UIP_ARCH_ADD32
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 void
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241 uip_add32(u8_t *op32, u16_t op16)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	243 uip_acc32[3] = op32[3] + (op16 & 0xff);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	244 uip_acc32[2] = op32[2] + (op16 >> 8);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	245 uip_acc32[1] = op32[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	246 uip_acc32[0] = op32[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	247
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	248 if(uip_acc32[2] < (op16 >> 8)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	249 ++uip_acc32[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	250 if(uip_acc32[1] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	251 ++uip_acc32[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	252 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	253 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	254
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	255
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	256 if(uip_acc32[3] < (op16 & 0xff)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	257 ++uip_acc32[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	258 if(uip_acc32[2] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	259 ++uip_acc32[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	260 if(uip_acc32[1] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	261 ++uip_acc32[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	262 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	263 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	264 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	265 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	266
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	267 #endif /* UIP_ARCH_ADD32 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	268
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	269 #if ! UIP_ARCH_CHKSUM
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	270 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	271 static u16_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	272 chksum(u16_t sum, const u8_t *data, u16_t len)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	273 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	274 u16_t t;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	275 const u8_t *dataptr;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	276 const u8_t *last_byte;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	277
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	278 dataptr = data;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	279 last_byte = data + len - 1;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	280
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	281 while(dataptr < last_byte) { /* At least two more bytes */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	282 t = (dataptr[0] << 8) + dataptr[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	283 sum += t;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	284 if(sum < t) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	285 sum++; /* carry */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	286 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	287 dataptr += 2;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	288 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	289
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	290 if(dataptr == last_byte) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	291 t = (dataptr[0] << 8) + 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	292 sum += t;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	293 if(sum < t) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	294 sum++; /* carry */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	295 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	296 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	297
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	298 /* Return sum in host byte order. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	299 return sum;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	300 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	301 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	302 u16_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	303 uip_chksum(u16_t *data, u16_t len)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	304 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	305 return uip_htons(chksum(0, (u8_t *)data, len));
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	306 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	307 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	308 #ifndef UIP_ARCH_IPCHKSUM
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	309 u16_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	310 uip_ipchksum(void)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	311 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	312 u16_t sum;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	313
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	314 sum = chksum(0, &uip_buf[UIP_LLH_LEN], UIP_IPH_LEN);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	315 DEBUG_PRINTF("uip_ipchksum: sum 0x%04x\n", sum);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	316 return (sum == 0) ? 0xffff : uip_htons(sum);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	317 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	318 #endif
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	319 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	320 static u16_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	321 upper_layer_chksum(u8_t proto)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	322 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	323 u16_t upper_layer_len;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	324 u16_t sum;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	325
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	327 upper_layer_len = (((u16_t)(BUF->len[0]) << 8) + BUF->len[1]);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	328 #else /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	329 upper_layer_len = (((u16_t)(BUF->len[0]) << 8) + BUF->len[1]) - UIP_IPH_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	330 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	331
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	332 /* First sum pseudoheader. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	333
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	334 /* IP protocol and length fields. This addition cannot carry. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	335 sum = upper_layer_len + proto;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	336 /* Sum IP source and destination addresses. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	337 sum = chksum(sum, (u8_t )&BUF->srcipaddr, 2 sizeof(uip_ipaddr_t));
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	338
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	339 /* Sum TCP header and data. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	340 sum = chksum(sum, &uip_buf[UIP_IPH_LEN + UIP_LLH_LEN],
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	341 upper_layer_len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	343 return (sum == 0) ? 0xffff : uip_htons(sum);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	344 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	345 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	346 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	347 u16_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	348 uip_icmp6chksum(void)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	349 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	350 return upper_layer_chksum(UIP_PROTO_ICMP6);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	351
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	352 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	353 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	354 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	355 u16_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	356 uip_tcpchksum(void)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	357 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	358 return upper_layer_chksum(UIP_PROTO_TCP);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	359 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	360 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	361 #if UIP_UDP_CHECKSUMS
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	362 u16_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	363 uip_udpchksum(void)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	364 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	365 return upper_layer_chksum(UIP_PROTO_UDP);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	366 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	367 #endif /* UIP_UDP_CHECKSUMS */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	368 #endif /* UIP_ARCH_CHKSUM */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	369 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	370 void
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	371 uip_init(void)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	372 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	373 for(c = 0; c < UIP_LISTENPORTS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	374 uip_listenports[c] = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	375 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	376 for(c = 0; c < UIP_CONNS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	377 uip_conns[c].tcpstateflags = UIP_CLOSED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	378 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	379 #if UIP_ACTIVE_OPEN \|\| UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	380 lastport = 1024;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	381 #endif /* UIP_ACTIVE_OPEN \|\| UIP_UDP */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	382
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	383 #if UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	384 for(c = 0; c < UIP_UDP_CONNS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	385 uip_udp_conns[c].lport = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	386 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	387 #endif /* UIP_UDP */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	388
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	389
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	390 /* IPv4 initialization. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	391 #if UIP_FIXEDADDR == 0
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	392 /* uip_hostaddr[0] = uip_hostaddr[1] = 0;*/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	393 #endif /* UIP_FIXEDADDR */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	394
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	395 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	396 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	397 #if UIP_ACTIVE_OPEN
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	398 struct uip_conn *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	399 uip_connect(uip_ipaddr_t *ripaddr, u16_t rport)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	400 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	401 register struct uip_conn conn, cconn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	402
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	403 /* Find an unused local port. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	404 again:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	405 ++lastport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	406
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	407 if(lastport >= 32000) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	408 lastport = 4096;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	409 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	410
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	411 /* Check if this port is already in use, and if so try to find
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	412 another one. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	413 for(c = 0; c < UIP_CONNS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	414 conn = &uip_conns[c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	415 if(conn->tcpstateflags != UIP_CLOSED &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	416 conn->lport == uip_htons(lastport)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	417 goto again;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	418 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	419 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	420
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	421 conn = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	422 for(c = 0; c < UIP_CONNS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	423 cconn = &uip_conns[c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	424 if(cconn->tcpstateflags == UIP_CLOSED) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	425 conn = cconn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	426 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	427 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	428 if(cconn->tcpstateflags == UIP_TIME_WAIT) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	429 if(conn == 0 \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	430 cconn->timer > conn->timer) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	431 conn = cconn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	432 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	433 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	434 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	435
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	436 if(conn == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	437 return 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	438 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	439
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	440 conn->tcpstateflags = UIP_SYN_SENT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	441
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	442 conn->snd_nxt[0] = iss[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	443 conn->snd_nxt[1] = iss[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	444 conn->snd_nxt[2] = iss[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	445 conn->snd_nxt[3] = iss[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	446
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	447 conn->initialmss = conn->mss = UIP_TCP_MSS;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	448
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	449 conn->len = 1; /* TCP length of the SYN is one. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	450 conn->nrtx = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	451 conn->timer = 1; /* Send the SYN next time around. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	452 conn->rto = UIP_RTO;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	453 conn->sa = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	454 conn->sv = 16; /* Initial value of the RTT variance. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	455 conn->lport = uip_htons(lastport);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	456 conn->rport = rport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	457 uip_ipaddr_copy(&conn->ripaddr, ripaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	458
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	459 return conn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	460 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	461 #endif /* UIP_ACTIVE_OPEN */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	462 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	463 #if UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	464 struct uip_udp_conn *
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	465 uip_udp_new(const uip_ipaddr_t *ripaddr, u16_t rport)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	466 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	467 register struct uip_udp_conn *conn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	468
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	469 /* Find an unused local port. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	470 again:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	471 ++lastport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	472
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	473 if(lastport >= 32000) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	474 lastport = 4096;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	475 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	476
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	477 for(c = 0; c < UIP_UDP_CONNS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	478 if(uip_udp_conns[c].lport == uip_htons(lastport)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	479 goto again;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	480 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	481 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	482
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	483
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	484 conn = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	485 for(c = 0; c < UIP_UDP_CONNS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	486 if(uip_udp_conns[c].lport == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	487 conn = &uip_udp_conns[c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	488 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	489 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	490 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	491
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	492 if(conn == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	493 return 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	494 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	495
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	496 conn->lport = UIP_HTONS(lastport);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	497 conn->rport = rport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	498 if(ripaddr == NULL) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	499 memset(&conn->ripaddr, 0, sizeof(uip_ipaddr_t));
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	500 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	501 uip_ipaddr_copy(&conn->ripaddr, ripaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	502 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	503 conn->ttl = UIP_TTL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	504
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	505 return conn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	506 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	507 #endif /* UIP_UDP */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	508 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	509 void
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	510 uip_unlisten(u16_t port)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	511 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	512 for(c = 0; c < UIP_LISTENPORTS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	513 if(uip_listenports[c] == port) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	514 uip_listenports[c] = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	515 return;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	516 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	517 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	518 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	519 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	520 void
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	521 uip_listen(u16_t port)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	522 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	523 for(c = 0; c < UIP_LISTENPORTS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	524 if(uip_listenports[c] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	525 uip_listenports[c] = port;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	526 return;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	527 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	528 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	529 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	530 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	531 /* XXX: IP fragment reassembly: not well-tested. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	532
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	533 #if UIP_REASSEMBLY && !UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	534 #define UIP_REASS_BUFSIZE (UIP_BUFSIZE - UIP_LLH_LEN)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	535 static u8_t uip_reassbuf[UIP_REASS_BUFSIZE];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	536 static u8_t uip_reassbitmap[UIP_REASS_BUFSIZE / (8 * 8)];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	537 static const u8_t bitmap_bits[8] = {0xff, 0x7f, 0x3f, 0x1f,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	538 0x0f, 0x07, 0x03, 0x01};
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	539 static u16_t uip_reasslen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	540 static u8_t uip_reassflags;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	541 #define UIP_REASS_FLAG_LASTFRAG 0x01
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	542 static u8_t uip_reasstmr;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	543
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	544 #define IP_MF 0x20
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	545
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	546 static u8_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	547 uip_reass(void)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	548 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	549 u16_t offset, len;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	550 u16_t i;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	551
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	552 /* If ip_reasstmr is zero, no packet is present in the buffer, so we
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	553 write the IP header of the fragment into the reassembly
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	554 buffer. The timer is updated with the maximum age. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	555 if(uip_reasstmr == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	556 memcpy(uip_reassbuf, &BUF->vhl, UIP_IPH_LEN);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	557 uip_reasstmr = UIP_REASS_MAXAGE;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	558 uip_reassflags = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	559 /* Clear the bitmap. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	560 memset(uip_reassbitmap, 0, sizeof(uip_reassbitmap));
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	561 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	562
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	563 /* Check if the incoming fragment matches the one currently present
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	564 in the reasembly buffer. If so, we proceed with copying the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	565 fragment into the buffer. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	566 if(BUF->srcipaddr[0] == FBUF->srcipaddr[0] &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	567 BUF->srcipaddr[1] == FBUF->srcipaddr[1] &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	568 BUF->destipaddr[0] == FBUF->destipaddr[0] &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	569 BUF->destipaddr[1] == FBUF->destipaddr[1] &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	570 BUF->ipid[0] == FBUF->ipid[0] &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	571 BUF->ipid[1] == FBUF->ipid[1]) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	572
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	573 len = (BUF->len[0] << 8) + BUF->len[1] - (BUF->vhl & 0x0f) * 4;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	574 offset = (((BUF->ipoffset[0] & 0x3f) << 8) + BUF->ipoffset[1]) * 8;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	575
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	576 /* If the offset or the offset + fragment length overflows the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	577 reassembly buffer, we discard the entire packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	578 if(offset > UIP_REASS_BUFSIZE \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	579 offset + len > UIP_REASS_BUFSIZE) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	580 uip_reasstmr = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	581 goto nullreturn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	582 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	583
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	584 /* Copy the fragment into the reassembly buffer, at the right
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	585 offset. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	586 memcpy(&uip_reassbuf[UIP_IPH_LEN + offset],
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	587 (char )BUF + (int)((BUF->vhl & 0x0f) 4),
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	588 len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	589
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	590 /* Update the bitmap. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	591 if(offset / (8 * 8) == (offset + len) / (8 * 8)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	592 /* If the two endpoints are in the same byte, we only update
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	593 that byte. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	594
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	595 uip_reassbitmap[offset / (8 * 8)] \|=
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	596 bitmap_bits[(offset / 8 ) & 7] &
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	597 ~bitmap_bits[((offset + len) / 8 ) & 7];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	598 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	599 /* If the two endpoints are in different bytes, we update the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	600 bytes in the endpoints and fill the stuff inbetween with
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	601 0xff. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	602 uip_reassbitmap[offset / (8 * 8)] \|=
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	603 bitmap_bits[(offset / 8 ) & 7];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	604 for(i = 1 + offset / (8 * 8); i < (offset + len) / (8 * 8); ++i) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	605 uip_reassbitmap[i] = 0xff;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	606 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	607 uip_reassbitmap[(offset + len) / (8 * 8)] \|=
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	608 ~bitmap_bits[((offset + len) / 8 ) & 7];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	609 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	610
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	611 /* If this fragment has the More Fragments flag set to zero, we
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	612 know that this is the last fragment, so we can calculate the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	613 size of the entire packet. We also set the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	614 IP_REASS_FLAG_LASTFRAG flag to indicate that we have received
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	615 the final fragment. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	616
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	617 if((BUF->ipoffset[0] & IP_MF) == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	618 uip_reassflags \|= UIP_REASS_FLAG_LASTFRAG;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	619 uip_reasslen = offset + len;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	620 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	621
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	622 /* Finally, we check if we have a full packet in the buffer. We do
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	623 this by checking if we have the last fragment and if all bits
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	624 in the bitmap are set. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	625 if(uip_reassflags & UIP_REASS_FLAG_LASTFRAG) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	626 /* Check all bytes up to and including all but the last byte in
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	627 the bitmap. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	628 for(i = 0; i < uip_reasslen / (8 * 8) - 1; ++i) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	629 if(uip_reassbitmap[i] != 0xff) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	630 goto nullreturn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	631 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	632 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	633 /* Check the last byte in the bitmap. It should contain just the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	634 right amount of bits. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	635 if(uip_reassbitmap[uip_reasslen / (8 * 8)] !=
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	636 (u8_t)~bitmap_bits[uip_reasslen / 8 & 7]) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	637 goto nullreturn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	638 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	639
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	640 /* If we have come this far, we have a full packet in the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	641 buffer, so we allocate a pbuf and copy the packet into it. We
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	642 also reset the timer. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	643 uip_reasstmr = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	644 memcpy(BUF, FBUF, uip_reasslen);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	645
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	646 /* Pretend to be a "normal" (i.e., not fragmented) IP packet
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	647 from now on. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	648 BUF->ipoffset[0] = BUF->ipoffset[1] = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	649 BUF->len[0] = uip_reasslen >> 8;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	650 BUF->len[1] = uip_reasslen & 0xff;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	651 BUF->ipchksum = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	652 BUF->ipchksum = ~(uip_ipchksum());
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	653
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	654 return uip_reasslen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	655 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	656 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	657
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	658 nullreturn:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	659 return 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	660 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	661 #endif /* UIP_REASSEMBLY */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	662 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	663 static void
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	664 uip_add_rcv_nxt(u16_t n)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	665 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	666 uip_add32(uip_conn->rcv_nxt, n);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	667 uip_conn->rcv_nxt[0] = uip_acc32[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	668 uip_conn->rcv_nxt[1] = uip_acc32[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	669 uip_conn->rcv_nxt[2] = uip_acc32[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	670 uip_conn->rcv_nxt[3] = uip_acc32[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	671 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	672 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	673 void
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	674 uip_process(u8_t flag)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	675 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	676 register struct uip_conn *uip_connr = uip_conn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	677
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	678 #if UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	679 if(flag == UIP_UDP_SEND_CONN) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	680 goto udp_send;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	681 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	682 #endif /* UIP_UDP */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	683
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	684 uip_sappdata = uip_appdata = &uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	685
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	686 /* Check if we were invoked because of a poll request for a
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	687 particular connection. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	688 if(flag == UIP_POLL_REQUEST) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	689 if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	690 !uip_outstanding(uip_connr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	691 uip_flags = UIP_POLL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	692 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	693 goto appsend;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	694 #if UIP_ACTIVE_OPEN
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	695 } else if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_SYN_SENT) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	696 /* In the SYN_SENT state, we retransmit out SYN. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	697 BUF->flags = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	698 goto tcp_send_syn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	699 #endif /* UIP_ACTIVE_OPEN */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	700 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	701 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	702
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	703 /* Check if we were invoked because of the perodic timer fireing. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	704 } else if(flag == UIP_TIMER) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	705 #if UIP_REASSEMBLY
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	706 if(uip_reasstmr != 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	707 --uip_reasstmr;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	708 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	709 #endif /* UIP_REASSEMBLY */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	710 /* Increase the initial sequence number. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	711 if(++iss[3] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	712 if(++iss[2] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	713 if(++iss[1] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	714 ++iss[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	715 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	716 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	717 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	718
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	719 /* Reset the length variables. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	720 uip_len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	721 uip_slen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	722
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	723 /* Check if the connection is in a state in which we simply wait
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	724 for the connection to time out. If so, we increase the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	725 connection's timer and remove the connection if it times
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	726 out. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	727 if(uip_connr->tcpstateflags == UIP_TIME_WAIT \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	728 uip_connr->tcpstateflags == UIP_FIN_WAIT_2) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	729 ++(uip_connr->timer);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	730 if(uip_connr->timer == UIP_TIME_WAIT_TIMEOUT) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	731 uip_connr->tcpstateflags = UIP_CLOSED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	732 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	733 } else if(uip_connr->tcpstateflags != UIP_CLOSED) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	734 /* If the connection has outstanding data, we increase the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	735 connection's timer and see if it has reached the RTO value
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	736 in which case we retransmit. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	737
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	738 if(uip_outstanding(uip_connr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	739 if(uip_connr->timer-- == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	740 if(uip_connr->nrtx == UIP_MAXRTX \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	741 ((uip_connr->tcpstateflags == UIP_SYN_SENT \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	742 uip_connr->tcpstateflags == UIP_SYN_RCVD) &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	743 uip_connr->nrtx == UIP_MAXSYNRTX)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	744 uip_connr->tcpstateflags = UIP_CLOSED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	745
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	746 /* We call UIP_APPCALL() with uip_flags set to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	747 UIP_TIMEDOUT to inform the application that the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	748 connection has timed out. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	749 uip_flags = UIP_TIMEDOUT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	750 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	751
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	752 /* We also send a reset packet to the remote host. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	753 BUF->flags = TCP_RST \| TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	754 goto tcp_send_nodata;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	755 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	756
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	757 /* Exponential backoff. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	758 uip_connr->timer = UIP_RTO << (uip_connr->nrtx > 4?
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	759 4:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	760 uip_connr->nrtx);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	761 ++(uip_connr->nrtx);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	762
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	763 /* Ok, so we need to retransmit. We do this differently
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	764 depending on which state we are in. In ESTABLISHED, we
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	765 call upon the application so that it may prepare the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	766 data for the retransmit. In SYN_RCVD, we resend the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	767 SYNACK that we sent earlier and in LAST_ACK we have to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	768 retransmit our FINACK. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	769 UIP_STAT(++uip_stat.tcp.rexmit);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	770 switch(uip_connr->tcpstateflags & UIP_TS_MASK) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	771 case UIP_SYN_RCVD:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	772 /* In the SYN_RCVD state, we should retransmit our
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	773 SYNACK. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	774 goto tcp_send_synack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	775
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	776 #if UIP_ACTIVE_OPEN
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	777 case UIP_SYN_SENT:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	778 /* In the SYN_SENT state, we retransmit out SYN. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	779 BUF->flags = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	780 goto tcp_send_syn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	781 #endif /* UIP_ACTIVE_OPEN */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	782
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	783 case UIP_ESTABLISHED:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	784 /* In the ESTABLISHED state, we call upon the application
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	785 to do the actual retransmit after which we jump into
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	786 the code for sending out the packet (the apprexmit
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	787 label). */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	788 uip_flags = UIP_REXMIT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	789 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	790 goto apprexmit;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	791
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	792 case UIP_FIN_WAIT_1:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	793 case UIP_CLOSING:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	794 case UIP_LAST_ACK:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	795 /* In all these states we should retransmit a FINACK. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	796 goto tcp_send_finack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	797
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	798 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	799 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	800 } else if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	801 /* If there was no need for a retransmission, we poll the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	802 application for new data. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	803 uip_flags = UIP_POLL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	804 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	805 goto appsend;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	806 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	807 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	808 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	809 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	810 #if UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	811 if(flag == UIP_UDP_TIMER) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	812 if(uip_udp_conn->lport != 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	813 uip_conn = NULL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	814 uip_sappdata = uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	815 uip_len = uip_slen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	816 uip_flags = UIP_POLL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	817 UIP_UDP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	818 goto udp_send;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	819 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	820 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	821 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	822 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	823 #endif
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	824
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	825 /* This is where the input processing starts. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	826 UIP_STAT(++uip_stat.ip.recv);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	827
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	828 /* Start of IP input header processing code. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	829
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	830 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	831 /* Check validity of the IP header. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	832 if((BUF->vtc & 0xf0) != 0x60) { /* IP version and header length. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	833 UIP_STAT(++uip_stat.ip.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	834 UIP_STAT(++uip_stat.ip.vhlerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	835 UIP_LOG("ipv6: invalid version.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	836 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	837 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	838 #else /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	839 /* Check validity of the IP header. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	840 if(BUF->vhl != 0x45) { /* IP version and header length. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	841 UIP_STAT(++uip_stat.ip.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	842 UIP_STAT(++uip_stat.ip.vhlerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	843 UIP_LOG("ip: invalid version or header length.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	844 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	845 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	846 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	847
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	848 /* Check the size of the packet. If the size reported to us in
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	849 uip_len is smaller the size reported in the IP header, we assume
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	850 that the packet has been corrupted in transit. If the size of
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	851 uip_len is larger than the size reported in the IP packet header,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	852 the packet has been padded and we set uip_len to the correct
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	853 value.. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	854
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	855 if((BUF->len[0] << 8) + BUF->len[1] <= uip_len) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	856 uip_len = (BUF->len[0] << 8) + BUF->len[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	857 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	858 uip_len += 40; /* The length reported in the IPv6 header is the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	859 length of the payload that follows the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	860 header. However, uIP uses the uip_len variable
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	861 for holding the size of the entire packet,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	862 including the IP header. For IPv4 this is not a
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	863 problem as the length field in the IPv4 header
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	864 contains the length of the entire packet. But
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	865 for IPv6 we need to add the size of the IPv6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	866 header (40 bytes). */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	867 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	868 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	869 UIP_LOG("ip: packet shorter than reported in IP header.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	870 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	871 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	872
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	873 #if !UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	874 /* Check the fragment flag. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	875 if((BUF->ipoffset[0] & 0x3f) != 0 \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	876 BUF->ipoffset[1] != 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	877 #if UIP_REASSEMBLY
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	878 uip_len = uip_reass();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	879 if(uip_len == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	880 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	881 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	882 #else /* UIP_REASSEMBLY */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	883 UIP_STAT(++uip_stat.ip.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	884 UIP_STAT(++uip_stat.ip.fragerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	885 UIP_LOG("ip: fragment dropped.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	886 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	887 #endif /* UIP_REASSEMBLY */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	888 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	889 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	890
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	891 if(uip_ipaddr_cmp(&uip_hostaddr, &uip_all_zeroes_addr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	892 /* If we are configured to use ping IP address configuration and
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	893 hasn't been assigned an IP address yet, we accept all ICMP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	894 packets. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	895 #if UIP_PINGADDRCONF && !UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	896 if(BUF->proto == UIP_PROTO_ICMP) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	897 UIP_LOG("ip: possible ping config packet received.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	898 goto icmp_input;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	899 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	900 UIP_LOG("ip: packet dropped since no address assigned.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	901 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	902 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	903 #endif /* UIP_PINGADDRCONF */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	904
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	905 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	906 /* If IP broadcast support is configured, we check for a broadcast
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	907 UDP packet, which may be destined to us. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	908 #if UIP_BROADCAST
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	909 DEBUG_PRINTF("UDP IP checksum 0x%04x\n", uip_ipchksum());
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	910 if(BUF->proto == UIP_PROTO_UDP &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	911 (uip_ipaddr_cmp(&BUF->destipaddr, &uip_broadcast_addr) \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	912 (BUF->destipaddr.u8[0] & 224) == 224)) { /* XXX this is a
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	913 hack to be able
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	914 to receive UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	915 multicast
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	916 packets. We check
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	917 for the bit
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	918 pattern of the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	919 multicast
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	920 prefix. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	921 goto udp_input;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	922 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	923 #endif /* UIP_BROADCAST */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	924
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	925 /* Check if the packet is destined for our IP address. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	926 #if !UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	927 if(!uip_ipaddr_cmp(&BUF->destipaddr, &uip_hostaddr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	928 UIP_STAT(++uip_stat.ip.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	929 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	930 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	931 #else /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	932 /* For IPv6, packet reception is a little trickier as we need to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	933 make sure that we listen to certain multicast addresses (all
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	934 hosts multicast address, and the solicited-node multicast
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	935 address) as well. However, we will cheat here and accept all
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	936 multicast packets that are sent to the ff02::/16 addresses. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	937 if(!uip_ipaddr_cmp(&BUF->destipaddr, &uip_hostaddr) &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	938 BUF->destipaddr.u16[0] != UIP_HTONS(0xff02)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	939 UIP_STAT(++uip_stat.ip.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	940 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	941 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	942 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	943 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	944
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	945 #if !UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	946 if(uip_ipchksum() != 0xffff) { /* Compute and check the IP header
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	947 checksum. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	948 UIP_STAT(++uip_stat.ip.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	949 UIP_STAT(++uip_stat.ip.chkerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	950 UIP_LOG("ip: bad checksum.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	951 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	952 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	953 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	954
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	955 if(BUF->proto == UIP_PROTO_TCP) { /* Check for TCP packet. If so,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	956 proceed with TCP input
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	957 processing. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	958 goto tcp_input;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	959 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	960
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	961 #if UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	962 if(BUF->proto == UIP_PROTO_UDP) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	963 goto udp_input;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	964 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	965 #endif /* UIP_UDP */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	966
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	967 #if !UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	968 /* ICMPv4 processing code follows. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	969 if(BUF->proto != UIP_PROTO_ICMP) { /* We only allow ICMP packets from
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	970 here. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	971 UIP_STAT(++uip_stat.ip.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	972 UIP_STAT(++uip_stat.ip.protoerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	973 UIP_LOG("ip: neither tcp nor icmp.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	974 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	975 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	976
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	977 #if UIP_PINGADDRCONF
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	978 icmp_input:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	979 #endif /* UIP_PINGADDRCONF */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	980 UIP_STAT(++uip_stat.icmp.recv);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	981
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	982 /* ICMP echo (i.e., ping) processing. This is simple, we only change
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	983 the ICMP type from ECHO to ECHO_REPLY and adjust the ICMP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	984 checksum before we return the packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	985 if(ICMPBUF->type != ICMP_ECHO) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	986 UIP_STAT(++uip_stat.icmp.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	987 UIP_STAT(++uip_stat.icmp.typeerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	988 UIP_LOG("icmp: not icmp echo.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	989 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	990 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	991
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	992 /* If we are configured to use ping IP address assignment, we use
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	993 the destination IP address of this ping packet and assign it to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	994 ourself. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	995 #if UIP_PINGADDRCONF
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	996 if(uip_ipaddr_cmp(&uip_hostaddr, &uip_all_zeroes_addr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	997 uip_hostaddr = BUF->destipaddr;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	998 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	999 #endif /* UIP_PINGADDRCONF */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1000
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1001 ICMPBUF->type = ICMP_ECHO_REPLY;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1002
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1003 if(ICMPBUF->icmpchksum >= UIP_HTONS(0xffff - (ICMP_ECHO << 8))) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1004 ICMPBUF->icmpchksum += UIP_HTONS(ICMP_ECHO << 8) + 1;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1005 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1006 ICMPBUF->icmpchksum += UIP_HTONS(ICMP_ECHO << 8);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1007 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1008
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1009 /* Swap IP addresses. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1010 uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1011 uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1012
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1013 UIP_STAT(++uip_stat.icmp.sent);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1014 BUF->ttl = UIP_TTL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1015 goto ip_send_nolen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1016
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1017 /* End of IPv4 input header processing code. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1018 #else /* !UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1019
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1020 /* This is IPv6 ICMPv6 processing code. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1021 DEBUG_PRINTF("icmp6_input: length %d\n", uip_len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1022
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1023 if(BUF->proto != UIP_PROTO_ICMP6) { /* We only allow ICMPv6 packets from
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1024 here. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1025 UIP_STAT(++uip_stat.ip.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1026 UIP_STAT(++uip_stat.ip.protoerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1027 UIP_LOG("ip: neither tcp nor icmp6.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1028 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1029 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1030
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1031 UIP_STAT(++uip_stat.icmp.recv);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1032
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1033 /* If we get a neighbor solicitation for our address we should send
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1034 a neighbor advertisement message back. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1035 if(ICMPBUF->type == ICMP6_NEIGHBOR_SOLICITATION) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1036 if(uip_ipaddr_cmp(&ICMPBUF->icmp6data, &uip_hostaddr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1037
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1038 if(ICMPBUF->options[0] == ICMP6_OPTION_SOURCE_LINK_ADDRESS) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1039 /* Save the sender's address in our neighbor list. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1040 uip_neighbor_add(&ICMPBUF->srcipaddr, &(ICMPBUF->options[2]));
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1041 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1042
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1043 /* We should now send a neighbor advertisement back to where the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1044 neighbor solicication came from. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1045 ICMPBUF->type = ICMP6_NEIGHBOR_ADVERTISEMENT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1046 ICMPBUF->flags = ICMP6_FLAG_S; /* Solicited flag. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1047
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1048 ICMPBUF->reserved1 = ICMPBUF->reserved2 = ICMPBUF->reserved3 = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1049
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1050 uip_ipaddr_copy(&ICMPBUF->destipaddr, &ICMPBUF->srcipaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1051 uip_ipaddr_copy(&ICMPBUF->srcipaddr, &uip_hostaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1052 ICMPBUF->options[0] = ICMP6_OPTION_TARGET_LINK_ADDRESS;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1053 ICMPBUF->options[1] = 1; /* Options length, 1 = 8 bytes. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1054 memcpy(&(ICMPBUF->options[2]), &uip_ethaddr, sizeof(uip_ethaddr));
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1055 ICMPBUF->icmpchksum = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1056 ICMPBUF->icmpchksum = ~uip_icmp6chksum();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1057
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1058 goto send;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1059
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1060 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1061 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1062 } else if(ICMPBUF->type == ICMP6_ECHO) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1063 /* ICMP echo (i.e., ping) processing. This is simple, we only
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1064 change the ICMP type from ECHO to ECHO_REPLY and update the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1065 ICMP checksum before we return the packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1066
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1067 ICMPBUF->type = ICMP6_ECHO_REPLY;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1068
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1069 uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1070 uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1071 ICMPBUF->icmpchksum = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1072 ICMPBUF->icmpchksum = ~uip_icmp6chksum();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1073
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1074 UIP_STAT(++uip_stat.icmp.sent);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1075 goto send;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1076 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1077 DEBUG_PRINTF("Unknown icmp6 message type %d\n", ICMPBUF->type);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1078 UIP_STAT(++uip_stat.icmp.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1079 UIP_STAT(++uip_stat.icmp.typeerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1080 UIP_LOG("icmp: unknown ICMP message.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1081 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1082 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1083
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1084 /* End of IPv6 ICMP processing. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1085
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1086 #endif /* !UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1087
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1088 #if UIP_UDP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1089 /* UDP input processing. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1090 udp_input:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1091 /* UDP processing is really just a hack. We don't do anything to the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1092 UDP/IP headers, but let the UDP application do all the hard
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1093 work. If the application sets uip_slen, it has a packet to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1094 send. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1095 #if UIP_UDP_CHECKSUMS
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1096 uip_len = uip_len - UIP_IPUDPH_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1097 uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1098 if(UDPBUF->udpchksum != 0 && uip_udpchksum() != 0xffff) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1099 UIP_STAT(++uip_stat.udp.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1100 UIP_STAT(++uip_stat.udp.chkerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1101 UIP_LOG("udp: bad checksum.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1102 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1103 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1104 #else /* UIP_UDP_CHECKSUMS */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1105 uip_len = uip_len - UIP_IPUDPH_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1106 #endif /* UIP_UDP_CHECKSUMS */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1107
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1108 /* Make sure that the UDP destination port number is not zero. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1109 if(UDPBUF->destport == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1110 UIP_LOG("udp: zero port.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1111 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1112 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1113
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1114 /* Demultiplex this UDP packet between the UDP "connections". */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1115 for(uip_udp_conn = &uip_udp_conns[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1116 uip_udp_conn < &uip_udp_conns[UIP_UDP_CONNS];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1117 ++uip_udp_conn) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1118 /* If the local UDP port is non-zero, the connection is considered
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1119 to be used. If so, the local port number is checked against the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1120 destination port number in the received packet. If the two port
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1121 numbers match, the remote port number is checked if the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1122 connection is bound to a remote port. Finally, if the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1123 connection is bound to a remote IP address, the source IP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1124 address of the packet is checked. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1125 if(uip_udp_conn->lport != 0 &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1126 UDPBUF->destport == uip_udp_conn->lport &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1127 (uip_udp_conn->rport == 0 \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1128 UDPBUF->srcport == uip_udp_conn->rport) &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1129 (uip_ipaddr_cmp(&uip_udp_conn->ripaddr, &uip_all_zeroes_addr) \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1130 uip_ipaddr_cmp(&uip_udp_conn->ripaddr, &uip_broadcast_addr) \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1131 uip_ipaddr_cmp(&BUF->srcipaddr, &uip_udp_conn->ripaddr))) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1132 goto udp_found;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1133 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1134 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1135 UIP_LOG("udp: no matching connection found");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1136 #if UIP_CONF_ICMP_DEST_UNREACH && !UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1137 /* Copy fields from packet header into payload of this ICMP packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1138 memcpy(&(ICMPBUF->payload[0]), ICMPBUF, UIP_IPH_LEN + 8);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1139
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1140 /* Set the ICMP type and code. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1141 ICMPBUF->type = ICMP_DEST_UNREACHABLE;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1142 ICMPBUF->icode = ICMP_PORT_UNREACHABLE;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1143
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1144 /* Calculate the ICMP checksum. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1145 ICMPBUF->icmpchksum = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1146 ICMPBUF->icmpchksum = ~uip_chksum((u16_t *)&(ICMPBUF->type), 36);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1147
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1148 /* Set the IP destination address to be the source address of the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1149 original packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1150 uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1151
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1152 /* Set our IP address as the source address. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1153 uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1154
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1155 /* The size of the ICMP destination unreachable packet is 36 + the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1156 size of the IP header (20) = 56. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1157 uip_len = 36 + UIP_IPH_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1158 ICMPBUF->len[0] = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1159 ICMPBUF->len[1] = (u8_t)uip_len;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1160 ICMPBUF->ttl = UIP_TTL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1161 ICMPBUF->proto = UIP_PROTO_ICMP;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1162
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1163 goto ip_send_nolen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1164 #else /* UIP_CONF_ICMP_DEST_UNREACH */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1165 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1166 #endif /* UIP_CONF_ICMP_DEST_UNREACH */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1167
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1168 udp_found:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1169 uip_conn = NULL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1170 uip_flags = UIP_NEWDATA;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1171 uip_sappdata = uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1172 uip_slen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1173 UIP_UDP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1174
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1175 udp_send:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1176 if(uip_slen == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1177 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1178 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1179 uip_len = uip_slen + UIP_IPUDPH_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1180
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1181 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1182 /* For IPv6, the IP length field does not include the IPv6 IP header
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1183 length. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1184 BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1185 BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1186 #else /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1187 BUF->len[0] = (uip_len >> 8);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1188 BUF->len[1] = (uip_len & 0xff);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1189 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1190
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1191 BUF->ttl = uip_udp_conn->ttl;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1192 BUF->proto = UIP_PROTO_UDP;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1193
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1194 UDPBUF->udplen = UIP_HTONS(uip_slen + UIP_UDPH_LEN);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1195 UDPBUF->udpchksum = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1196
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1197 BUF->srcport = uip_udp_conn->lport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1198 BUF->destport = uip_udp_conn->rport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1199
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1200 uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1201 uip_ipaddr_copy(&BUF->destipaddr, &uip_udp_conn->ripaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1202
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1203 uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPTCPH_LEN];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1204
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1205 #if UIP_UDP_CHECKSUMS
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1206 /* Calculate UDP checksum. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1207 UDPBUF->udpchksum = ~(uip_udpchksum());
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1208 if(UDPBUF->udpchksum == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1209 UDPBUF->udpchksum = 0xffff;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1210 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1211 #endif /* UIP_UDP_CHECKSUMS */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1212
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1213 goto ip_send_nolen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1214 #endif /* UIP_UDP */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1215
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1216 /* TCP input processing. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1217 tcp_input:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1218 UIP_STAT(++uip_stat.tcp.recv);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1219
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1220 /* Start of TCP input header processing code. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1221
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1222 if(uip_tcpchksum() != 0xffff) { /* Compute and check the TCP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1223 checksum. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1224 UIP_STAT(++uip_stat.tcp.drop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1225 UIP_STAT(++uip_stat.tcp.chkerr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1226 UIP_LOG("tcp: bad checksum.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1227 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1228 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1229
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1230 /* Make sure that the TCP port number is not zero. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1231 if(BUF->destport == 0 \|\| BUF->srcport == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1232 UIP_LOG("tcp: zero port.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1233 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1234 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1235
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1236 /* Demultiplex this segment. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1237 /* First check any active connections. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1238 for(uip_connr = &uip_conns[0]; uip_connr <= &uip_conns[UIP_CONNS - 1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1239 ++uip_connr) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1240 if(uip_connr->tcpstateflags != UIP_CLOSED &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1241 BUF->destport == uip_connr->lport &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1242 BUF->srcport == uip_connr->rport &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1243 uip_ipaddr_cmp(&BUF->srcipaddr, &uip_connr->ripaddr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1244 goto found;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1245 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1246 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1247
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1248 /* If we didn't find and active connection that expected the packet,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1249 either this packet is an old duplicate, or this is a SYN packet
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1250 destined for a connection in LISTEN. If the SYN flag isn't set,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1251 it is an old packet and we send a RST. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1252 if((BUF->flags & TCP_CTL) != TCP_SYN) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1253 goto reset;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1254 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1255
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1256 tmp16 = BUF->destport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1257 /* Next, check listening connections. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1258 for(c = 0; c < UIP_LISTENPORTS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1259 if(tmp16 == uip_listenports[c]) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1260 goto found_listen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1261 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1262 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1263
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1264 /* No matching connection found, so we send a RST packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1265 UIP_STAT(++uip_stat.tcp.synrst);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1266
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1267 reset:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1268 /* We do not send resets in response to resets. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1269 if(BUF->flags & TCP_RST) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1270 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1271 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1272
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1273 UIP_STAT(++uip_stat.tcp.rst);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1274
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1275 BUF->flags = TCP_RST \| TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1276 uip_len = UIP_IPTCPH_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1277 BUF->tcpoffset = 5 << 4;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1278
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1279 /* Flip the seqno and ackno fields in the TCP header. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1280 c = BUF->seqno[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1281 BUF->seqno[3] = BUF->ackno[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1282 BUF->ackno[3] = c;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1283
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1284 c = BUF->seqno[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1285 BUF->seqno[2] = BUF->ackno[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1286 BUF->ackno[2] = c;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1287
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1288 c = BUF->seqno[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1289 BUF->seqno[1] = BUF->ackno[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1290 BUF->ackno[1] = c;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1291
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1292 c = BUF->seqno[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1293 BUF->seqno[0] = BUF->ackno[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1294 BUF->ackno[0] = c;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1295
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1296 /* We also have to increase the sequence number we are
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1297 acknowledging. If the least significant byte overflowed, we need
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1298 to propagate the carry to the other bytes as well. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1299 if(++BUF->ackno[3] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1300 if(++BUF->ackno[2] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1301 if(++BUF->ackno[1] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1302 ++BUF->ackno[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1303 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1304 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1305 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1306
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1307 /* Swap port numbers. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1308 tmp16 = BUF->srcport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1309 BUF->srcport = BUF->destport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1310 BUF->destport = tmp16;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1311
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1312 /* Swap IP addresses. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1313 uip_ipaddr_copy(&BUF->destipaddr, &BUF->srcipaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1314 uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1315
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1316 /* And send out the RST packet! */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1317 goto tcp_send_noconn;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1318
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1319 /* This label will be jumped to if we matched the incoming packet
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1320 with a connection in LISTEN. In that case, we should create a new
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1321 connection and send a SYNACK in return. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1322 found_listen:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1323 /* First we check if there are any connections avaliable. Unused
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1324 connections are kept in the same table as used connections, but
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1325 unused ones have the tcpstate set to CLOSED. Also, connections in
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1326 TIME_WAIT are kept track of and we'll use the oldest one if no
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1327 CLOSED connections are found. Thanks to Eddie C. Dost for a very
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1328 nice algorithm for the TIME_WAIT search. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1329 uip_connr = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1330 for(c = 0; c < UIP_CONNS; ++c) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1331 if(uip_conns[c].tcpstateflags == UIP_CLOSED) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1332 uip_connr = &uip_conns[c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1333 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1334 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1335 if(uip_conns[c].tcpstateflags == UIP_TIME_WAIT) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1336 if(uip_connr == 0 \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1337 uip_conns[c].timer > uip_connr->timer) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1338 uip_connr = &uip_conns[c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1339 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1340 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1341 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1342
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1343 if(uip_connr == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1344 /* All connections are used already, we drop packet and hope that
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1345 the remote end will retransmit the packet at a time when we
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1346 have more spare connections. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1347 UIP_STAT(++uip_stat.tcp.syndrop);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1348 UIP_LOG("tcp: found no unused connections.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1349 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1350 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1351 uip_conn = uip_connr;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1352
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1353 /* Fill in the necessary fields for the new connection. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1354 uip_connr->rto = uip_connr->timer = UIP_RTO;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1355 uip_connr->sa = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1356 uip_connr->sv = 4;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1357 uip_connr->nrtx = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1358 uip_connr->lport = BUF->destport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1359 uip_connr->rport = BUF->srcport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1360 uip_ipaddr_copy(&uip_connr->ripaddr, &BUF->srcipaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1361 uip_connr->tcpstateflags = UIP_SYN_RCVD;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1362
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1363 uip_connr->snd_nxt[0] = iss[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1364 uip_connr->snd_nxt[1] = iss[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1365 uip_connr->snd_nxt[2] = iss[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1366 uip_connr->snd_nxt[3] = iss[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1367 uip_connr->len = 1;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1368
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1369 /* rcv_nxt should be the seqno from the incoming packet + 1. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1370 uip_connr->rcv_nxt[3] = BUF->seqno[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1371 uip_connr->rcv_nxt[2] = BUF->seqno[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1372 uip_connr->rcv_nxt[1] = BUF->seqno[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1373 uip_connr->rcv_nxt[0] = BUF->seqno[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1374 uip_add_rcv_nxt(1);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1375
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1376 /* Parse the TCP MSS option, if present. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1377 if((BUF->tcpoffset & 0xf0) > 0x50) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1378 for(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2 ;) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1379 opt = uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1380 if(opt == TCP_OPT_END) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1381 /* End of options. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1382 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1383 } else if(opt == TCP_OPT_NOOP) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1384 ++c;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1385 /* NOP option. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1386 } else if(opt == TCP_OPT_MSS &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1387 uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == TCP_OPT_MSS_LEN) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1388 /* An MSS option with the right option length. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1389 tmp16 = ((u16_t)uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + c] << 8) \|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1390 (u16_t)uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + 3 + c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1391 uip_connr->initialmss = uip_connr->mss =
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1392 tmp16 > UIP_TCP_MSS? UIP_TCP_MSS: tmp16;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1393
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1394 /* And we are done processing options. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1395 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1396 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1397 /* All other options have a length field, so that we easily
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1398 can skip past them. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1399 if(uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1400 /* If the length field is zero, the options are malformed
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1401 and we don't process them further. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1402 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1403 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1404 c += uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1405 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1406 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1407 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1408
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1409 /* Our response will be a SYNACK. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1410 #if UIP_ACTIVE_OPEN
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1411 tcp_send_synack:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1412 BUF->flags = TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1413
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1414 tcp_send_syn:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1415 BUF->flags \|= TCP_SYN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1416 #else /* UIP_ACTIVE_OPEN */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1417 tcp_send_synack:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1418 BUF->flags = TCP_SYN \| TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1419 #endif /* UIP_ACTIVE_OPEN */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1420
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1421 /* We send out the TCP Maximum Segment Size option with our
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1422 SYNACK. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1423 BUF->optdata[0] = TCP_OPT_MSS;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1424 BUF->optdata[1] = TCP_OPT_MSS_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1425 BUF->optdata[2] = (UIP_TCP_MSS) / 256;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1426 BUF->optdata[3] = (UIP_TCP_MSS) & 255;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1427 uip_len = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1428 BUF->tcpoffset = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) << 4;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1429 goto tcp_send;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1430
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1431 /* This label will be jumped to if we found an active connection. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1432 found:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1433 uip_conn = uip_connr;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1434 uip_flags = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1435 /* We do a very naive form of TCP reset processing; we just accept
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1436 any RST and kill our connection. We should in fact check if the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1437 sequence number of this reset is wihtin our advertised window
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1438 before we accept the reset. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1439 if(BUF->flags & TCP_RST) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1440 uip_connr->tcpstateflags = UIP_CLOSED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1441 UIP_LOG("tcp: got reset, aborting connection.");
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1442 uip_flags = UIP_ABORT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1443 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1444 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1445 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1446 /* Calculate the length of the data, if the application has sent
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1447 any data to us. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1448 c = (BUF->tcpoffset >> 4) << 2;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1449 /* uip_len will contain the length of the actual TCP data. This is
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1450 calculated by subtracing the length of the TCP header (in
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1451 c) and the length of the IP header (20 bytes). */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1452 uip_len = uip_len - c - UIP_IPH_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1453
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1454 /* First, check if the sequence number of the incoming packet is
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1455 what we're expecting next. If not, we send out an ACK with the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1456 correct numbers in, unless we are in the SYN_RCVD state and
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1457 receive a SYN, in which case we should retransmit our SYNACK
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1458 (which is done futher down). */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1459 if(!((((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_SYN_SENT) &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1460 ((BUF->flags & TCP_CTL) == (TCP_SYN \| TCP_ACK))) \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1461 (((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_SYN_RCVD) &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1462 ((BUF->flags & TCP_CTL) == TCP_SYN)))) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1463 if((uip_len > 0 \|\| ((BUF->flags & (TCP_SYN \| TCP_FIN)) != 0)) &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1464 (BUF->seqno[0] != uip_connr->rcv_nxt[0] \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1465 BUF->seqno[1] != uip_connr->rcv_nxt[1] \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1466 BUF->seqno[2] != uip_connr->rcv_nxt[2] \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1467 BUF->seqno[3] != uip_connr->rcv_nxt[3])) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1468 goto tcp_send_ack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1469 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1470 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1471
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1472 /* Next, check if the incoming segment acknowledges any outstanding
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1473 data. If so, we update the sequence number, reset the length of
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1474 the outstanding data, calculate RTT estimations, and reset the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1475 retransmission timer. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1476 if((BUF->flags & TCP_ACK) && uip_outstanding(uip_connr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1477 uip_add32(uip_connr->snd_nxt, uip_connr->len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1478
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1479 if(BUF->ackno[0] == uip_acc32[0] &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1480 BUF->ackno[1] == uip_acc32[1] &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1481 BUF->ackno[2] == uip_acc32[2] &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1482 BUF->ackno[3] == uip_acc32[3]) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1483 /* Update sequence number. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1484 uip_connr->snd_nxt[0] = uip_acc32[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1485 uip_connr->snd_nxt[1] = uip_acc32[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1486 uip_connr->snd_nxt[2] = uip_acc32[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1487 uip_connr->snd_nxt[3] = uip_acc32[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1488
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1489 /* Do RTT estimation, unless we have done retransmissions. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1490 if(uip_connr->nrtx == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1491 signed char m;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1492 m = uip_connr->rto - uip_connr->timer;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1493 /* This is taken directly from VJs original code in his paper */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1494 m = m - (uip_connr->sa >> 3);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1495 uip_connr->sa += m;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1496 if(m < 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1497 m = -m;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1498 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1499 m = m - (uip_connr->sv >> 2);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1500 uip_connr->sv += m;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1501 uip_connr->rto = (uip_connr->sa >> 3) + uip_connr->sv;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1502
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1503 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1504 /* Set the acknowledged flag. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1505 uip_flags = UIP_ACKDATA;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1506 /* Reset the retransmission timer. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1507 uip_connr->timer = uip_connr->rto;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1508
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1509 /* Reset length of outstanding data. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1510 uip_connr->len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1511 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1512
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1513 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1514
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1515 /* Do different things depending on in what state the connection is. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1516 switch(uip_connr->tcpstateflags & UIP_TS_MASK) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1517 /* CLOSED and LISTEN are not handled here. CLOSE_WAIT is not
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1518 implemented, since we force the application to close when the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1519 peer sends a FIN (hence the application goes directly from
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1520 ESTABLISHED to LAST_ACK). */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1521 case UIP_SYN_RCVD:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1522 /* In SYN_RCVD we have sent out a SYNACK in response to a SYN, and
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1523 we are waiting for an ACK that acknowledges the data we sent
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1524 out the last time. Therefore, we want to have the UIP_ACKDATA
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1525 flag set. If so, we enter the ESTABLISHED state. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1526 if(uip_flags & UIP_ACKDATA) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1527 uip_connr->tcpstateflags = UIP_ESTABLISHED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1528 uip_flags = UIP_CONNECTED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1529 uip_connr->len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1530 if(uip_len > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1531 uip_flags \|= UIP_NEWDATA;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1532 uip_add_rcv_nxt(uip_len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1533 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1534 uip_slen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1535 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1536 goto appsend;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1537 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1538 /* We need to retransmit the SYNACK */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1539 if((BUF->flags & TCP_CTL) == TCP_SYN) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1540 goto tcp_send_synack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1541 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1542 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1543 #if UIP_ACTIVE_OPEN
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1544 case UIP_SYN_SENT:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1545 /* In SYN_SENT, we wait for a SYNACK that is sent in response to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1546 our SYN. The rcv_nxt is set to sequence number in the SYNACK
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1547 plus one, and we send an ACK. We move into the ESTABLISHED
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1548 state. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1549 if((uip_flags & UIP_ACKDATA) &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1550 (BUF->flags & TCP_CTL) == (TCP_SYN \| TCP_ACK)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1551
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1552 /* Parse the TCP MSS option, if present. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1553 if((BUF->tcpoffset & 0xf0) > 0x50) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1554 for(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2 ;) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1555 opt = uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1556 if(opt == TCP_OPT_END) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1557 /* End of options. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1558 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1559 } else if(opt == TCP_OPT_NOOP) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1560 ++c;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1561 /* NOP option. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1562 } else if(opt == TCP_OPT_MSS &&
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1563 uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == TCP_OPT_MSS_LEN) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1564 /* An MSS option with the right option length. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1565 tmp16 = (uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + c] << 8) \|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1566 uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 3 + c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1567 uip_connr->initialmss =
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1568 uip_connr->mss = tmp16 > UIP_TCP_MSS? UIP_TCP_MSS: tmp16;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1569
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1570 /* And we are done processing options. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1571 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1572 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1573 /* All other options have a length field, so that we easily
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1574 can skip past them. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1575 if(uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1576 /* If the length field is zero, the options are malformed
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1577 and we don't process them further. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1578 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1579 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1580 c += uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1581 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1582 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1583 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1584 uip_connr->tcpstateflags = UIP_ESTABLISHED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1585 uip_connr->rcv_nxt[0] = BUF->seqno[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1586 uip_connr->rcv_nxt[1] = BUF->seqno[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1587 uip_connr->rcv_nxt[2] = BUF->seqno[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1588 uip_connr->rcv_nxt[3] = BUF->seqno[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1589 uip_add_rcv_nxt(1);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1590 uip_flags = UIP_CONNECTED \| UIP_NEWDATA;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1591 uip_connr->len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1592 uip_len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1593 uip_slen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1594 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1595 goto appsend;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1596 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1597 /* Inform the application that the connection failed */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1598 uip_flags = UIP_ABORT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1599 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1600 /* The connection is closed after we send the RST */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1601 uip_conn->tcpstateflags = UIP_CLOSED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1602 goto reset;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1603 #endif /* UIP_ACTIVE_OPEN */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1604
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1605 case UIP_ESTABLISHED:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1606 /* In the ESTABLISHED state, we call upon the application to feed
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1607 data into the uip_buf. If the UIP_ACKDATA flag is set, the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1608 application should put new data into the buffer, otherwise we are
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1609 retransmitting an old segment, and the application should put that
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1610 data into the buffer.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1611
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1612 If the incoming packet is a FIN, we should close the connection on
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1613 this side as well, and we send out a FIN and enter the LAST_ACK
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1614 state. We require that there is no outstanding data; otherwise the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1615 sequence numbers will be screwed up. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1616
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1617 if(BUF->flags & TCP_FIN && !(uip_connr->tcpstateflags & UIP_STOPPED)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1618 if(uip_outstanding(uip_connr)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1619 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1620 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1621 uip_add_rcv_nxt(1 + uip_len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1622 uip_flags \|= UIP_CLOSE;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1623 if(uip_len > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1624 uip_flags \|= UIP_NEWDATA;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1625 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1626 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1627 uip_connr->len = 1;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1628 uip_connr->tcpstateflags = UIP_LAST_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1629 uip_connr->nrtx = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1630 tcp_send_finack:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1631 BUF->flags = TCP_FIN \| TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1632 goto tcp_send_nodata;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1633 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1634
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1635 /* Check the URG flag. If this is set, the segment carries urgent
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1636 data that we must pass to the application. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1637 if((BUF->flags & TCP_URG) != 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1638 #if UIP_URGDATA > 0
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1639 uip_urglen = (BUF->urgp[0] << 8) \| BUF->urgp[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1640 if(uip_urglen > uip_len) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1641 /* There is more urgent data in the next segment to come. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1642 uip_urglen = uip_len;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1643 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1644 uip_add_rcv_nxt(uip_urglen);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1645 uip_len -= uip_urglen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1646 uip_urgdata = uip_appdata;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1647 uip_appdata += uip_urglen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1648 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1649 uip_urglen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1650 #else /* UIP_URGDATA > 0 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1651 uip_appdata = ((char *)uip_appdata) + ((BUF->urgp[0] << 8) \| BUF->urgp[1]);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1652 uip_len -= (BUF->urgp[0] << 8) \| BUF->urgp[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1653 #endif /* UIP_URGDATA > 0 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1654 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1655
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1656 /* If uip_len > 0 we have TCP data in the packet, and we flag this
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1657 by setting the UIP_NEWDATA flag and update the sequence number
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1658 we acknowledge. If the application has stopped the dataflow
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1659 using uip_stop(), we must not accept any data packets from the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1660 remote host. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1661 if(uip_len > 0 && !(uip_connr->tcpstateflags & UIP_STOPPED)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1662 uip_flags \|= UIP_NEWDATA;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1663 uip_add_rcv_nxt(uip_len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1664 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1665
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1666 /* Check if the available buffer space advertised by the other end
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1667 is smaller than the initial MSS for this connection. If so, we
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1668 set the current MSS to the window size to ensure that the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1669 application does not send more data than the other end can
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1670 handle.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1671
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1672 If the remote host advertises a zero window, we set the MSS to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1673 the initial MSS so that the application will send an entire MSS
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1674 of data. This data will not be acknowledged by the receiver,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1675 and the application will retransmit it. This is called the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1676 "persistent timer" and uses the retransmission mechanim.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1677 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1678 tmp16 = ((u16_t)BUF->wnd[0] << 8) + (u16_t)BUF->wnd[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1679 if(tmp16 > uip_connr->initialmss \|\|
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1680 tmp16 == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1681 tmp16 = uip_connr->initialmss;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1682 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1683 uip_connr->mss = tmp16;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1684
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1685 /* If this packet constitutes an ACK for outstanding data (flagged
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1686 by the UIP_ACKDATA flag, we should call the application since it
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1687 might want to send more data. If the incoming packet had data
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1688 from the peer (as flagged by the UIP_NEWDATA flag), the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1689 application must also be notified.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1690
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1691 When the application is called, the global variable uip_len
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1692 contains the length of the incoming data. The application can
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1693 access the incoming data through the global pointer
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1694 uip_appdata, which usually points UIP_IPTCPH_LEN + UIP_LLH_LEN
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1695 bytes into the uip_buf array.
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1696
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1697 If the application wishes to send any data, this data should be
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1698 put into the uip_appdata and the length of the data should be
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1699 put into uip_len. If the application don't have any data to
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1700 send, uip_len must be set to 0. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1701 if(uip_flags & (UIP_NEWDATA \| UIP_ACKDATA)) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1702 uip_slen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1703 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1704
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1705 appsend:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1706
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1707 if(uip_flags & UIP_ABORT) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1708 uip_slen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1709 uip_connr->tcpstateflags = UIP_CLOSED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1710 BUF->flags = TCP_RST \| TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1711 goto tcp_send_nodata;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1712 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1713
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1714 if(uip_flags & UIP_CLOSE) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1715 uip_slen = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1716 uip_connr->len = 1;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1717 uip_connr->tcpstateflags = UIP_FIN_WAIT_1;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1718 uip_connr->nrtx = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1719 BUF->flags = TCP_FIN \| TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1720 goto tcp_send_nodata;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1721 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1722
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1723 /* If uip_slen > 0, the application has data to be sent. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1724 if(uip_slen > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1725
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1726 /* If the connection has acknowledged data, the contents of
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1727 the ->len variable should be discarded. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1728 if((uip_flags & UIP_ACKDATA) != 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1729 uip_connr->len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1730 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1731
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1732 /* If the ->len variable is non-zero the connection has
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1733 already data in transit and cannot send anymore right
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1734 now. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1735 if(uip_connr->len == 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1736
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1737 /* The application cannot send more than what is allowed by
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1738 the mss (the minumum of the MSS and the available
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1739 window). */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1740 if(uip_slen > uip_connr->mss) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1741 uip_slen = uip_connr->mss;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1742 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1743
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1744 /* Remember how much data we send out now so that we know
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1745 when everything has been acknowledged. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1746 uip_connr->len = uip_slen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1747 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1748
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1749 /* If the application already had unacknowledged data, we
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1750 make sure that the application does not send (i.e.,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1751 retransmit) out more than it previously sent out. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1752 uip_slen = uip_connr->len;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1753 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1754 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1755 uip_connr->nrtx = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1756 apprexmit:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1757 uip_appdata = uip_sappdata;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1758
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1759 /* If the application has data to be sent, or if the incoming
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1760 packet had new data in it, we must send out a packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1761 if(uip_slen > 0 && uip_connr->len > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1762 /* Add the length of the IP and TCP headers. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1763 uip_len = uip_connr->len + UIP_TCPIP_HLEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1764 /* We always set the ACK flag in response packets. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1765 BUF->flags = TCP_ACK \| TCP_PSH;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1766 /* Send the packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1767 goto tcp_send_noopts;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1768 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1769 /* If there is no data to send, just send out a pure ACK if
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1770 there is newdata. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1771 if(uip_flags & UIP_NEWDATA) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1772 uip_len = UIP_TCPIP_HLEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1773 BUF->flags = TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1774 goto tcp_send_noopts;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1775 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1776 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1777 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1778 case UIP_LAST_ACK:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1779 /* We can close this connection if the peer has acknowledged our
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1780 FIN. This is indicated by the UIP_ACKDATA flag. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1781 if(uip_flags & UIP_ACKDATA) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1782 uip_connr->tcpstateflags = UIP_CLOSED;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1783 uip_flags = UIP_CLOSE;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1784 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1785 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1786 break;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1787
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1788 case UIP_FIN_WAIT_1:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1789 /* The application has closed the connection, but the remote host
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1790 hasn't closed its end yet. Thus we do nothing but wait for a
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1791 FIN from the other side. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1792 if(uip_len > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1793 uip_add_rcv_nxt(uip_len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1794 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1795 if(BUF->flags & TCP_FIN) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1796 if(uip_flags & UIP_ACKDATA) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1797 uip_connr->tcpstateflags = UIP_TIME_WAIT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1798 uip_connr->timer = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1799 uip_connr->len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1800 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1801 uip_connr->tcpstateflags = UIP_CLOSING;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1802 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1803 uip_add_rcv_nxt(1);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1804 uip_flags = UIP_CLOSE;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1805 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1806 goto tcp_send_ack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1807 } else if(uip_flags & UIP_ACKDATA) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1808 uip_connr->tcpstateflags = UIP_FIN_WAIT_2;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1809 uip_connr->len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1810 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1811 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1812 if(uip_len > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1813 goto tcp_send_ack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1814 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1815 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1816
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1817 case UIP_FIN_WAIT_2:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1818 if(uip_len > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1819 uip_add_rcv_nxt(uip_len);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1820 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1821 if(BUF->flags & TCP_FIN) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1822 uip_connr->tcpstateflags = UIP_TIME_WAIT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1823 uip_connr->timer = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1824 uip_add_rcv_nxt(1);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1825 uip_flags = UIP_CLOSE;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1826 UIP_APPCALL();
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1827 goto tcp_send_ack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1828 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1829 if(uip_len > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1830 goto tcp_send_ack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1831 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1832 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1833
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1834 case UIP_TIME_WAIT:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1835 goto tcp_send_ack;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1836
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1837 case UIP_CLOSING:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1838 if(uip_flags & UIP_ACKDATA) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1839 uip_connr->tcpstateflags = UIP_TIME_WAIT;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1840 uip_connr->timer = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1841 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1842 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1843 goto drop;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1844
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1845 /* We jump here when we are ready to send the packet, and just want
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1846 to set the appropriate TCP sequence numbers in the TCP header. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1847 tcp_send_ack:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1848 BUF->flags = TCP_ACK;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1849
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1850 tcp_send_nodata:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1851 uip_len = UIP_IPTCPH_LEN;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1852
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1853 tcp_send_noopts:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1854 BUF->tcpoffset = (UIP_TCPH_LEN / 4) << 4;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1855
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1856 /* We're done with the input processing. We are now ready to send a
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1857 reply. Our job is to fill in all the fields of the TCP and IP
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1858 headers before calculating the checksum and finally send the
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1859 packet. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1860 tcp_send:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1861 BUF->ackno[0] = uip_connr->rcv_nxt[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1862 BUF->ackno[1] = uip_connr->rcv_nxt[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1863 BUF->ackno[2] = uip_connr->rcv_nxt[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1864 BUF->ackno[3] = uip_connr->rcv_nxt[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1865
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1866 BUF->seqno[0] = uip_connr->snd_nxt[0];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1867 BUF->seqno[1] = uip_connr->snd_nxt[1];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1868 BUF->seqno[2] = uip_connr->snd_nxt[2];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1869 BUF->seqno[3] = uip_connr->snd_nxt[3];
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1870
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1871 BUF->proto = UIP_PROTO_TCP;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1872
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1873 BUF->srcport = uip_connr->lport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1874 BUF->destport = uip_connr->rport;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1875
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1876 uip_ipaddr_copy(&BUF->srcipaddr, &uip_hostaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1877 uip_ipaddr_copy(&BUF->destipaddr, &uip_connr->ripaddr);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1878
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1879 if(uip_connr->tcpstateflags & UIP_STOPPED) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1880 /* If the connection has issued uip_stop(), we advertise a zero
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1881 window so that the remote host will stop sending data. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1882 BUF->wnd[0] = BUF->wnd[1] = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1883 } else {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1884 BUF->wnd[0] = ((UIP_RECEIVE_WINDOW) >> 8);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1885 BUF->wnd[1] = ((UIP_RECEIVE_WINDOW) & 0xff);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1886 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1887
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1888 tcp_send_noconn:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1889 BUF->ttl = UIP_TTL;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1890 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1891 /* For IPv6, the IP length field does not include the IPv6 IP header
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1892 length. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1893 BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1894 BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1895 #else /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1896 BUF->len[0] = (uip_len >> 8);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1897 BUF->len[1] = (uip_len & 0xff);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1898 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1899
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1900 BUF->urgp[0] = BUF->urgp[1] = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1901
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1902 /* Calculate TCP checksum. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1903 BUF->tcpchksum = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1904 BUF->tcpchksum = ~(uip_tcpchksum());
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1905
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1906 ip_send_nolen:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1907 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1908 BUF->vtc = 0x60;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1909 BUF->tcflow = 0x00;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1910 BUF->flow = 0x00;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1911 #else /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1912 BUF->vhl = 0x45;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1913 BUF->tos = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1914 BUF->ipoffset[0] = BUF->ipoffset[1] = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1915 ++ipid;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1916 BUF->ipid[0] = ipid >> 8;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1917 BUF->ipid[1] = ipid & 0xff;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1918 /* Calculate IP checksum. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1919 BUF->ipchksum = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1920 BUF->ipchksum = ~(uip_ipchksum());
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1921 DEBUG_PRINTF("uip ip_send_nolen: chkecum 0x%04x\n", uip_ipchksum());
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1922 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1923 UIP_STAT(++uip_stat.tcp.sent);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1924 #if UIP_CONF_IPV6
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1925 send:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1926 #endif /* UIP_CONF_IPV6 */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1927 DEBUG_PRINTF("Sending packet with length %d (%d)\n", uip_len,
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1928 (BUF->len[0] << 8) \| BUF->len[1]);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1929
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1930 UIP_STAT(++uip_stat.ip.sent);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1931 /* Return and let the caller do the actual transmission. */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1932 uip_flags = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1933 return;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1934
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1935 drop:
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1936 uip_len = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1937 uip_flags = 0;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1938 return;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1939 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1940 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1941 u16_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1942 uip_htons(u16_t val)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1943 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1944 return UIP_HTONS(val);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1945 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1946
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1947 u32_t
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1948 uip_htonl(u32_t val)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1949 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1950 return UIP_HTONL(val);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1951 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1952 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1953 void
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1954 uip_send(const void *data, int len)
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1955 {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1956 int copylen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1957 #define MIN(a,b) ((a) < (b)? (a): (b))
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1958 copylen = MIN(len, UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN -
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1959 (int)((char )uip_sappdata - (char )&uip_buf[UIP_LLH_LEN + UIP_TCPIP_HLEN]));
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1960 if(copylen > 0) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1961 uip_slen = copylen;
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1962 if(data != uip_sappdata) {
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1963 memcpy(uip_sappdata, (data), uip_slen);
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1964 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1965 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1966 }
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1967 /---------------------------------------------------------------------------/
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1968 /** @} */
56d09a0969b5 Import uIP and the PPP implementation from Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1969 #endif /* UIP_CONF_IPV6 */

Mercurial > templog

annotate network/uip.c @ 107:56d09a0969b5 avr-http