conntrackd: add clause to enable ctnetlink reliable event delivery

This patch adds the NetlinkEventsReliable clause, this is useful
to turn on reliable Netlink event delivery. This features
requires a Linux kernel >= 2.6.31.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/netlink.c b/src/netlink.c
index 5c07201..a43f782 100644
--- a/src/netlink.c
+++ b/src/netlink.c
@@ -75,6 +75,18 @@ struct nfct_handle *nl_init_event_handler(void)
 		CONFIG(netlink_buffer_size_max_grown) =
 					CONFIG(netlink_buffer_size);
 
+	if (CONFIG(netlink).events_reliable) {
+		int on = 1;
+
+		setsockopt(nfct_fd(h), SOL_NETLINK,
+			   NETLINK_BROADCAST_SEND_ERROR, &on, sizeof(int));
+
+		setsockopt(nfct_fd(h), SOL_NETLINK,
+			   NETLINK_NO_ENOBUFS, &on, sizeof(int));
+
+		dlog(LOG_NOTICE, "reliable ctnetlink event delivery "
+				 "is ENABLED.");
+	}
 	return h;
 }