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socket: Add new OSMO_SOCK_F_NO_MCAST_ALL option 

Using this option at socket creation, the caller can request disabling
the IP_MULTICAST_ALL socket option.

Change-Id: I5ab5de45c0b64ceb3636ea98245a23defa24ffd4
This commit is contained in:
Harald Welte 2017-07-13 16:33:16 +02:00
parent bc43a62f41
commit 37d204a120
2 changed files with 12 additions and 0 deletions
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2
include/osmocom/core/socket.h
View File

@ -22,6 +22,8 @@ struct osmo_fd;
#define OSMO_SOCK_F_NONBLOCK (1 << 2)
/*! disable multiast loop (IP_MULTICAST_LOOP) */
#define OSMO_SOCK_F_NO_MCAST_LOOP (1 << 3)
/*! disable receiving all multiast even for non-subscribed groups */
#define OSMO_SOCK_F_NO_MCAST_ALL (1 << 4)
int osmo_sock_init(uint16_t family, uint16_t type, uint8_t proto,
const char *host, uint16_t port, unsigned int flags);

10
src/socket.c
View File

@ -132,6 +132,16 @@ static int osmo_sock_init_tail(int fd, uint16_t type, unsigned int flags)
}
}
if (flags & OSMO_SOCK_F_NO_MCAST_ALL) {
rc = osmo_sock_mcast_all_set(fd, false);
if (rc < 0) {
LOGP(DLGLOBAL, LOGL_ERROR, "unable to disable receive of all multicast: %s\n",
strerror(errno));
/* do not abort here, as this is just an
* optional additional optimization that only
* exists on Linux only */
}
}
return 0;
}