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netlink-socket: Add functions for joining and leaving multicast groups.

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When this library was originally implemented, support for Linux 2.4 was
important.  The Netlink implementation in Linux only added support for
joining and leaving multicast groups after a socket is bound as of Linux
2.6.14, so the library did not support it either.  But the current version
of Open vSwitch targets Linux 2.6.18 and over, so it's fine to add this
support now, and this commit does so.

This will be used more extensively in upcoming commits.

Reviewed by Justin Pettit.
This commit is contained in:
Ben Pfaff
2011-01-09 16:57:45 -08:00
parent 18c58479a1
commit cceb11f5b1
10 changed files with 97 additions and 72 deletions
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11
lib/rtnetlink.c
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@@ -89,13 +89,20 @@ rtnetlink_notifier_register(struct rtnetlink *rtn,
rtnetlink_notify_func *cb, void *aux)
{
if (!rtn->notify_sock) {
int error = nl_sock_create(NETLINK_ROUTE, rtn->multicast_group, 0, 0,
&rtn->notify_sock);
struct nl_sock *sock;
int error;
error = nl_sock_create(NETLINK_ROUTE, &sock);
if (!error) {
error = nl_sock_join_mcgroup(sock, rtn->multicast_group);
}
if (error) {
nl_sock_destroy(sock);
VLOG_WARN("could not create rtnetlink socket: %s",
strerror(error));
return error;
}
rtn->notify_sock = sock;
} else {
/* Catch up on notification work so that the new notifier won't
* receive any stale notifications. */