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ipv4/igmp: Don't drop IGMP pkt with zeros src addr 

Don't drop IGMP packets with a source address of all zeros which are
IGMP proxy reports. This is documented in Section 2.1.1 IGMP
Forwarding Rules of RFC 4541 IGMP and MLD Snooping Switches
Considerations.

Signed-off-by: Edward Chron <echron@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Edward Chron 2019-01-31 15:00:40 -08:00 committed by David S. Miller
parent f66ebd14a7
commit 1d2f4ebbbe
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/route.c
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@ -1608,7 +1608,8 @@ int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
return -EINVAL;
if (ipv4_is_zeronet(saddr)) {
if (!ipv4_is_local_multicast(daddr))
if (!ipv4_is_local_multicast(daddr) &&
ip_hdr(skb)->protocol != IPPROTO_IGMP)
return -EINVAL;
} else {
err = fib_validate_source(skb, saddr, 0, tos, 0, dev,