src/common/sessiond-comm/inet.h

   1 /*
   2  * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #ifndef _LTTCOMM_INET_H
   9 #define _LTTCOMM_INET_H
  10
  11 #include <limits.h>
  12
  13 #include "sessiond-comm.h"
  14
  15 /* See man tcp(7) for more detail about this value. */
  16 #define LTTCOMM_INET_PROC_SYN_RETRIES_PATH "/proc/sys/net/ipv4/tcp_syn_retries"
  17 #define LTTCOMM_INET_PROC_FIN_TIMEOUT_PATH "/proc/sys/net/ipv4/tcp_fin_timeout"
  18
  19 /*
  20  * The timeout value of a connect() is computed with an algorithm inside the
  21  * kernel using the defined TCP SYN retries so the end value in time is
  22  * approximative. According to tcp(7) man page, a value of 5 is roughly 180
  23  * seconds of timeout. With that information, we've computed a factor of 36
  24  * (180/5) by considering that it grows linearly. This is of course uncertain
  25  * but this is the best approximation we can do at runtime.
  26  */
  27 #define LTTCOMM_INET_SYN_TIMEOUT_FACTOR         36
  28
  29 /*
  30  * Maximum timeout value in seconds of a TCP connection for both send/recv and
  31  * connect operations.
  32  */
  33 extern unsigned long lttcomm_inet_tcp_timeout;
  34
  35 /* Stub */
  36 struct lttcomm_sock;
  37
  38 /* Net family callback */
  39 extern int lttcomm_create_inet_sock(struct lttcomm_sock *sock, int type,
  40                 int proto);
  41
  42 extern struct lttcomm_sock *lttcomm_accept_inet_sock(struct lttcomm_sock *sock);
  43 extern int lttcomm_bind_inet_sock(struct lttcomm_sock *sock);
  44 extern int lttcomm_close_inet_sock(struct lttcomm_sock *sock);
  45 extern int lttcomm_connect_inet_sock(struct lttcomm_sock *sock);
  46 extern int lttcomm_listen_inet_sock(struct lttcomm_sock *sock, int backlog);
  47
  48 extern ssize_t lttcomm_recvmsg_inet_sock(struct lttcomm_sock *sock, void *buf,
  49                 size_t len, int flags);
  50 extern ssize_t lttcomm_sendmsg_inet_sock(struct lttcomm_sock *sock,
  51                 const void *buf, size_t len, int flags);
  52
  53 /* Initialize inet communication layer. */
  54 extern void lttcomm_inet_init(void);
  55
  56 #endif  /* _LTTCOMM_INET_H */