Begin forwarded message:
Date: Wed, 03 Apr 2019 04:49:49 +0000
From: bugzilla-dae...@bugzilla.kernel.org
To: step...@networkplumber.org
Subject: [Bug 203137] New: Bridge does not forward multicast if
multicast_querier is enabled
https://bugzilla.kernel.org/show_bug.cgi?id=203137
Bug ID: 203137
Summary: Bridge does not forward multicast if multicast_querier
is enabled
Product: Networking
Version: 2.5
Kernel Version: 5.0.3
Hardware: All
OS: Linux
Tree: Fedora
Status: NEW
Severity: normal
Priority: P1
Component: Other
Assignee: step...@networkplumber.org
Reporter: liam.mcbir...@boeing.com
Regression: Yes
When multicast querier is enabled on a bridge, multicasts are not forwarded
according to the multicast forwarding database.
"bridge mdb" shows the multicast forwarding entries but they are not forwarded
to the ports.
Manually adding the port to the bridge multicast DB works.
Wireshark shows the packets arriving on the bridge but not being sent out the
proper port.
The regression was introduced by commit
19e3a9c90c53479fecaa02307bf2db5ab8b3ffe3, "net: bridge: convert multicast to
generic rhashtable" by Nikolay Aleksandrov <niko...@cumulusnetworks.com>.
Steps to reproduce:
ip link add br0 type bridge mcast_querier 1
ip link set br0 up
ip link add v2 type veth peer name v3
ip link set v2 master br0
ip link set v2 up
ip link set v3 up
ip addr add 3.0.0.2/24 dev v3
ip netns add test
ip link add v1 type veth peer name v1 netns test
ip link set v1 master br0
ip link set v1 up
ip -n test link set v1 up
ip -n test addr add 3.0.0.1/24 dev v1
# Multicast receiver
ip netns exec test socat
UDP4-RECVFROM:5588,ip-add-membership=224.224.224.224:3.0.0.1,fork -
# Multicast sender
echo hello | nc -u -s 3.0.0.2 224.224.224.224 5588
Observe that 'bridge mdb' has an entry for 224.224.224.224 on port v1.
Observe that the multicast packets are seen on v2, v3 and br0 but not v1.
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