Mercurial > dropbear

annotate netio.h @ 1857:6022df862942

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Use DSCP for IP QoS traffic classes The previous TOS values are deprecated and not used by modern traffic classifiers. This sets AF21 for "interactive" traffic (with a tty). Non-tty traffic sets AF11 - that indicates high throughput but is not lowest priority (which would be CS1 or LE). This differs from the CS1 used by OpenSSH, it lets interactive git over SSH have higher priority than background least effort traffic. Dropbear's settings here should be suitable with the diffservs used by CAKE qdisc.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 25 Jan 2022 17:32:20 +0800
parents f787f60f8e45
children 1d86a58fb52d
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1 #ifndef DROPBEAR_NETIO_H
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2 #define DROPBEAR_NETIO_H
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3
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4 #include "includes.h"
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5 #include "buffer.h"
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6 #include "queue.h"
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7
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8 enum dropbear_prio {
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9 DROPBEAR_PRIO_DEFAULT = 10,
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10 DROPBEAR_PRIO_LOWDELAY = 11,
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11 DROPBEAR_PRIO_BULK = 12,
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12 };
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13
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14 void set_sock_nodelay(int sock);
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15 void set_sock_priority(int sock, enum dropbear_prio prio);
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16
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17 int get_sock_port(int sock);
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18 void get_socket_address(int fd, char **local_host, char **local_port,
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19 char **remote_host, char **remote_port, int host_lookup);
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20 void getaddrstring(struct sockaddr_storage* addr,
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21 char **ret_host, char **ret_port, int host_lookup);
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22 int dropbear_listen(const char* address, const char* port,
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23 int *socks, unsigned int sockcount, char **errstring, int *maxfd);
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25 struct dropbear_progress_connection;
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26
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27 /* result is DROPBEAR_SUCCESS or DROPBEAR_FAILURE.
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28 errstring is only set on DROPBEAR_FAILURE, returns failure message for the last attempted socket */
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29 typedef void(*connect_callback)(int result, int sock, void* data, const char* errstring);
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30
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31 /* Always returns a progress connection, if it fails it will call the callback at a later point */
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32 struct dropbear_progress_connection * connect_remote (const char* remotehost, const char* remoteport,
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33 connect_callback cb, void *cb_data, const char* bind_address, const char* bind_port);
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35 /* Sets up for select() */
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36 void set_connect_fds(fd_set *writefd);
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37 /* Handles ready sockets after select() */
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38 void handle_connect_fds(const fd_set *writefd);
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39 /* Cleanup */
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40 void remove_connect_pending(void);
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41
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42 /* Doesn't actually stop the connect, but adds a dummy callback instead */
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43 void cancel_connect(struct dropbear_progress_connection *c);
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45 void connect_set_writequeue(struct dropbear_progress_connection *c, struct Queue *writequeue);
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46
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47 /* TODO: writev #ifdef guard */
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48 /* Fills out iov which contains iov_count slots, returning the number filled in iov_count */
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49 void packet_queue_to_iovec(const struct Queue *queue, struct iovec *iov, unsigned int *iov_count);
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50 void packet_queue_consume(struct Queue *queue, ssize_t written);
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51
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52 #if DROPBEAR_SERVER_TCP_FAST_OPEN
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53 /* Try for any Linux builds, will fall back if the kernel doesn't support it */
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54 void set_listen_fast_open(int sock);
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55 /* Define values which may be supported by the kernel even if the libc is too old */
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56 #ifndef TCP_FASTOPEN
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57 #define TCP_FASTOPEN 23
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58 #endif
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59 #ifndef MSG_FASTOPEN
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60 #define MSG_FASTOPEN 0x20000000
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61 #endif
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62 #endif
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64 #endif
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