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lib: add a function to configure tcp keepalive parameters

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New function setsockopt_tcp_keepalive() is added to enable TCP keepalive
mechanism for specified socket. Also TCP keepalive idle time, interval
and maximum probes are configured.

Signed-off-by: Xiaofeng Liu <xiaofeng.liu@6wind.com>
Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Xiaofeng Liu 2017-12-05 10:25:16 +01:00 committed by Philippe Guibert
parent 9982282d41
commit 5c480b5db3
2 changed files with 71 additions and 0 deletions
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49
lib/sockopt.c
View File

@ -699,3 +699,52 @@ int sockopt_tcp_mss_get(int sock)
return tcp_maxseg;
}
int setsockopt_tcp_keepalive(int sock, uint16_t keepalive_idle,
uint16_t keepalive_intvl,
uint16_t keepalive_probes)
{
int val = 1;
if (setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val)) < 0) {
flog_err_sys(EC_LIB_SYSTEM_CALL,
"%s failed: setsockopt SO_KEEPALIVE (%d): %s",
__func__, sock, safe_strerror(errno));
return -1;
}
#if defined __OpenBSD__
return 0;
#else
/* Send first probe after keepalive_idle seconds */
val = keepalive_idle;
if (setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, &val, sizeof(val)) <
0) {
flog_err_sys(EC_LIB_SYSTEM_CALL,
"%s failed: setsockopt TCP_KEEPIDLE (%d): %s",
__func__, sock, safe_strerror(errno));
return -1;
}
/* Set interval between two probes */
val = keepalive_intvl;
if (setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL, &val, sizeof(val)) <
0) {
flog_err_sys(EC_LIB_SYSTEM_CALL,
"%s failed: setsockopt TCP_KEEPINTVL (%d): %s",
__func__, sock, safe_strerror(errno));
return -1;
}
/* Set maximum probes */
val = keepalive_probes;
if (setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT, &val, sizeof(val)) < 0) {
flog_err_sys(EC_LIB_SYSTEM_CALL,
"%s failed: setsockopt TCP_KEEPCNT (%d): %s",
__func__, sock, safe_strerror(errno));
return -1;
}
return 0;
#endif
}

22
lib/sockopt.h
View File

@ -153,6 +153,28 @@ extern int sockopt_tcp_mss_set(int sock, int tcp_maxseg);
* Socket to get max segement size.
*/
extern int sockopt_tcp_mss_get(int sock);
/*
* Configure TCP keepalive for a given socket
*
* sock
* Socket to enable keepalive option on.
*
* keepalive_idle
* number of seconds a connection needs to be idle
* before sending out keep-alive proves
*
* keepalive_intvl
* number of seconds between TCP keep-alive probes
*
* keepalive_probes
* max number of probers to send before giving up
* and killing tcp connection
*/
extern int setsockopt_tcp_keepalive(int sock, uint16_t keepalive_idle,
uint16_t keepalive_intvl,
uint16_t keepalive_probes);
#ifdef __cplusplus
}
#endif