netdev - [PATCH net-next 09/16] net: bridge: mcast: when igmpv3/mldv2 are enabled lookup (S,G) first, then (*,G)

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Date:   Mon, 21 Sep 2020 13:55:19 +0300
From:   Nikolay Aleksandrov <razor@...ckwall.org>
To:     netdev@...r.kernel.org
Cc:     roopa@...dia.com, davem@...emloft.net,
        bridge@...ts.linux-foundation.org,
        Nikolay Aleksandrov <nikolay@...dia.com>
Subject: [PATCH net-next 09/16] net: bridge: mcast: when igmpv3/mldv2 are enabled lookup (S,G) first, then (*,G)

From: Nikolay Aleksandrov <nikolay@...dia.com>

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@...dia.com>
---
 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 e1fb822b9ddb..4fd690bc848f 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:
-- 
2.25.4