From c7b725be84985532161bcb4fbecd056326998a77 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Tue, 15 Aug 2017 18:38:42 -0700 Subject: [PATCH] net: igmp: Use ingress interface rather than vrf device Anuradha reported that statically added groups for interfaces enslaved to a VRF device were not persisting. The problem is that igmp queries and reports need to use the data in the in_dev for the real ingress device rather than the VRF device. Update igmp_rcv accordingly. Fixes: e58e41596811 ("net: Enable support for VRF with ipv4 multicast") Reported-by: Anuradha Karuppiah Signed-off-by: David Ahern Reviewed-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- net/ipv4/igmp.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c index 498706b072fb..caf2f1101d02 100644 --- a/net/ipv4/igmp.c +++ b/net/ipv4/igmp.c @@ -1007,10 +1007,18 @@ int igmp_rcv(struct sk_buff *skb) { /* This basically follows the spec line by line -- see RFC1112 */ struct igmphdr *ih; - struct in_device *in_dev = __in_dev_get_rcu(skb->dev); + struct net_device *dev = skb->dev; + struct in_device *in_dev; int len = skb->len; bool dropped = true; + if (netif_is_l3_master(dev)) { + dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); + if (!dev) + goto drop; + } + + in_dev = __in_dev_get_rcu(dev); if (!in_dev) goto drop; -- 2.30.2