ip_mc_clear_src resets the imc->sfcount and imc->sfmode, without taking into account the current number of sockets listening on that multicast struct, which can lead to bogus routes for local listeners. On NETDEV_DOWN/UP event, if there were 3 multicast listeners for that interface's address, the imc->sfcount[MCAST_EXCLUDE] will be reset to 1. And after that a listener socket destroys, multicast traffic will not be delivered to local listeners because __mkroute_output drops the local flag for the route (by checking ip_check_mc). Signed-off-by: Veaceslav Falico <vfalico@xxxxxxxxxx> diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index 1fd3d9c..b14f371 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -1775,9 +1775,6 @@ static void ip_mc_clear_src(struct ip_mc_list *pmc) kfree(psf); } pmc->sources = NULL; - pmc->sfmode = MCAST_EXCLUDE; - pmc->sfcount[MCAST_INCLUDE] = 0; - pmc->sfcount[MCAST_EXCLUDE] = 1; } -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
