Messages in this thread | | | Subject | Re: [PATCH 4.19 01/24] bridge: do not add port to router list when receives query with source 0.0.0.0 | From | Sebastian Gottschall <> | Date | Sun, 17 Feb 2019 15:29:22 +0100 |
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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@gmail.com> > > [ 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@redhat.com> > Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> > Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com> > Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com> > Signed-off-by: David S. Miller <davem@davemloft.net> > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> > --- > 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, > > >
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