On Sun, Feb 17, 2019 at 03:29:22PM +0100, Sebastian Gottschall wrote: > according to user reports this patch will cause a serious regression. igmp > snooping is not working anymore with this patch > > Am 02.11.2018 um 19:34 schrieb Greg Kroah-Hartman: > > 4.19-stable review patch. If anyone has any objections, please let me know. > > > > ------------------ > > > > From: Hangbin Liu <liuhangbin@xxxxxxxxx> > > > > [ Upstream commit 5a2de63fd1a59c30c02526d427bc014b98adf508 ] > > > > Based on RFC 4541, 2.1.1. IGMP Forwarding Rules > > > > The switch supporting IGMP snooping must maintain a list of > > multicast routers and the ports on which they are attached. This > > list can be constructed in any combination of the following ways: > > > > a) This list should be built by the snooping switch sending > > Multicast Router Solicitation messages as described in IGMP > > Multicast Router Discovery [MRDISC]. It may also snoop > > Multicast Router Advertisement messages sent by and to other > > nodes. > > > > b) The arrival port for IGMP Queries (sent by multicast routers) > > where the source address is not 0.0.0.0. > > > > We should not add the port to router list when receives query with source > > 0.0.0.0. > > > > Reported-by: Ying Xu <yinxu@xxxxxxxxxx> > > Signed-off-by: Hangbin Liu <liuhangbin@xxxxxxxxx> > > Acked-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx> > > Acked-by: Roopa Prabhu <roopa@xxxxxxxxxxxxxxxxxxx> > > Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> > > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > > --- > > net/bridge/br_multicast.c | 10 +++++++++- > > 1 file changed, 9 insertions(+), 1 deletion(-) > > > > --- a/net/bridge/br_multicast.c > > +++ b/net/bridge/br_multicast.c > > @@ -1420,7 +1420,15 @@ static void br_multicast_query_received( > > return; > > br_multicast_update_query_timer(br, query, max_delay); > > - br_multicast_mark_router(br, port); > > + > > + /* Based on RFC4541, section 2.1.1 IGMP Forwarding Rules, > > + * the arrival port for IGMP Queries where the source address > > + * is 0.0.0.0 should not be added to router port list. > > + */ > > + if ((saddr->proto == htons(ETH_P_IP) && saddr->u.ip4) || > > + (saddr->proto == htons(ETH_P_IPV6) && > > + !ipv6_addr_any(&saddr->u.ip6))) > > + br_multicast_mark_router(br, port); > > } > > static void br_ip4_multicast_query(struct net_bridge *br, Is this also a problem in 4.20? This patch went into 4.20-rc1, so it has been around for a while with no reported issues that I can find. Any pointers to the reports? thanks, greg k-h
