From 7d07a68c251080f8f2cfd071b7b3f7d1093a3375 Mon Sep 17 00:00:00 2001
From: Nikolay Aleksandrov <nikolay@nvidia.com>
Date: Tue, 22 Sep 2020 10:30:20 +0300
Subject: [PATCH] net: bridge: mcast: when igmpv3/mldv2 are enabled lookup
(S,G) first, then (*,G)
If (S,G) entries are enabled (igmpv3/mldv2) then look them up first. If
there isn't a present (S,G) entry then try to find (*,G).
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/bridge/br_multicast.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index e1fb822b9ddb81..4fd690bc848f07 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -127,10 +127,28 @@ struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
switch (skb->protocol) {
case htons(ETH_P_IP):
ip.dst.ip4 = ip_hdr(skb)->daddr;
+ if (br->multicast_igmp_version == 3) {
+ struct net_bridge_mdb_entry *mdb;
+
+ ip.src.ip4 = ip_hdr(skb)->saddr;
+ mdb = br_mdb_ip_get_rcu(br, &ip);
+ if (mdb)
+ return mdb;
+ ip.src.ip4 = 0;
+ }
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
ip.dst.ip6 = ipv6_hdr(skb)->daddr;
+ if (br->multicast_mld_version == 2) {
+ struct net_bridge_mdb_entry *mdb;
+
+ ip.src.ip6 = ipv6_hdr(skb)->saddr;
+ mdb = br_mdb_ip_get_rcu(br, &ip);
+ if (mdb)
+ return mdb;
+ memset(&ip.src.ip6, 0, sizeof(ip.src.ip6));
+ }
break;
#endif
default:
--
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