kernel: implement optinal multicast->unicast conversion for igmp snooping

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41367 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 748 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.10/645-bridge_multicast_to_unicast.patch b/target/linux/generic/patches-3.10/645-bridge_multicast_to_unicast.patch
new file mode 100644
index 0000000000..cb5b760b3b
--- /dev/null
+++ b/target/linux/generic/patches-3.10/645-bridge_multicast_to_unicast.patch
@@ -0,0 +1,373 @@
+--- a/net/bridge/br_multicast.c
++++ b/net/bridge/br_multicast.c
+@@ -630,7 +630,8 @@ struct net_bridge_port_group *br_multica
+ 			struct net_bridge_port *port,
+ 			struct br_ip *group,
+ 			struct net_bridge_port_group __rcu *next,
+-			unsigned char state)
++			unsigned char state,
++			const unsigned char *src)
+ {
+ 	struct net_bridge_port_group *p;
+ 
+@@ -645,12 +646,33 @@ struct net_bridge_port_group *br_multica
+ 	hlist_add_head(&p->mglist, &port->mglist);
+ 	setup_timer(&p->timer, br_multicast_port_group_expired,
+ 		    (unsigned long)p);
++	if ((port->flags & BR_MULTICAST_TO_UCAST) && src) {
++		memcpy(p->eth_addr, src, ETH_ALEN);
++		p->unicast = true;
++	}
+ 	return p;
+ }
+ 
++static bool br_port_group_equal(struct net_bridge_port_group *p,
++				struct net_bridge_port *port,
++				const unsigned char *src)
++{
++	if (p->port != port)
++		return false;
++
++	if (!p->unicast)
++		return true;
++
++	if (!src)
++		return false;
++
++	return ether_addr_equal(src, p->eth_addr);
++}
++
+ static int br_multicast_add_group(struct net_bridge *br,
+ 				  struct net_bridge_port *port,
+-				  struct br_ip *group)
++				  struct br_ip *group,
++				  const unsigned char *src)
+ {
+ 	struct net_bridge_mdb_entry *mp;
+ 	struct net_bridge_port_group *p;
+@@ -677,13 +699,13 @@ static int br_multicast_add_group(struct
+ 	for (pp = &mp->ports;
+ 	     (p = mlock_dereference(*pp, br)) != NULL;
+ 	     pp = &p->next) {
+-		if (p->port == port)
++		if (br_port_group_equal(p, port, src))
+ 			goto found;
+ 		if ((unsigned long)p->port < (unsigned long)port)
+ 			break;
+ 	}
+ 
+-	p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
++	p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY, src);
+ 	if (unlikely(!p))
+ 		goto err;
+ 	rcu_assign_pointer(*pp, p);
+@@ -702,7 +724,7 @@ err:
+ static int br_ip4_multicast_add_group(struct net_bridge *br,
+ 				      struct net_bridge_port *port,
+ 				      __be32 group,
+-				      __u16 vid)
++				      __u16 vid, const unsigned char *src)
+ {
+ 	struct br_ip br_group;
+ 
+@@ -713,14 +735,14 @@ static int br_ip4_multicast_add_group(st
+ 	br_group.proto = htons(ETH_P_IP);
+ 	br_group.vid = vid;
+ 
+-	return br_multicast_add_group(br, port, &br_group);
++	return br_multicast_add_group(br, port, &br_group, src);
+ }
+ 
+ #if IS_ENABLED(CONFIG_IPV6)
+ static int br_ip6_multicast_add_group(struct net_bridge *br,
+ 				      struct net_bridge_port *port,
+ 				      const struct in6_addr *group,
+-				      __u16 vid)
++				      __u16 vid, const unsigned char *src)
+ {
+ 	struct br_ip br_group;
+ 
+@@ -731,7 +753,7 @@ static int br_ip6_multicast_add_group(st
+ 	br_group.proto = htons(ETH_P_IPV6);
+ 	br_group.vid = vid;
+ 
+-	return br_multicast_add_group(br, port, &br_group);
++	return br_multicast_add_group(br, port, &br_group, src);
+ }
+ #endif
+ 
+@@ -898,6 +920,7 @@ static int br_ip4_multicast_igmp3_report
+ 					 struct net_bridge_port *port,
+ 					 struct sk_buff *skb)
+ {
++	const unsigned char *src = eth_hdr(skb)->h_source;
+ 	struct igmpv3_report *ih;
+ 	struct igmpv3_grec *grec;
+ 	int i;
+@@ -943,7 +966,7 @@ static int br_ip4_multicast_igmp3_report
+ 			continue;
+ 		}
+ 
+-		err = br_ip4_multicast_add_group(br, port, group, vid);
++		err = br_ip4_multicast_add_group(br, port, group, vid, src);
+ 		if (err)
+ 			break;
+ 	}
+@@ -956,6 +979,7 @@ static int br_ip6_multicast_mld2_report(
+ 					struct net_bridge_port *port,
+ 					struct sk_buff *skb)
+ {
++	const unsigned char *src = eth_hdr(skb)->h_source;
+ 	struct icmp6hdr *icmp6h;
+ 	struct mld2_grec *grec;
+ 	int i;
+@@ -1006,7 +1030,7 @@ static int br_ip6_multicast_mld2_report(
+ 		}
+ 
+ 		err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
+-						 vid);
++						 vid, src);
+ 		if (!err)
+ 			break;
+ 	}
+@@ -1235,7 +1259,8 @@ out:
+ 
+ static void br_multicast_leave_group(struct net_bridge *br,
+ 				     struct net_bridge_port *port,
+-				     struct br_ip *group)
++				     struct br_ip *group,
++				     const unsigned char *src)
+ {
+ 	struct net_bridge_mdb_htable *mdb;
+ 	struct net_bridge_mdb_entry *mp;
+@@ -1260,7 +1285,7 @@ static void br_multicast_leave_group(str
+ 		for (pp = &mp->ports;
+ 		     (p = mlock_dereference(*pp, br)) != NULL;
+ 		     pp = &p->next) {
+-			if (p->port != port)
++			if (!br_port_group_equal(p, port, src))
+ 				continue;
+ 
+ 			rcu_assign_pointer(*pp, p->next);
+@@ -1294,7 +1319,7 @@ static void br_multicast_leave_group(str
+ 	for (p = mlock_dereference(mp->ports, br);
+ 	     p != NULL;
+ 	     p = mlock_dereference(p->next, br)) {
+-		if (p->port != port)
++		if (!br_port_group_equal(p, port, src))
+ 			continue;
+ 
+ 		if (!hlist_unhashed(&p->mglist) &&
+@@ -1313,8 +1338,8 @@ out:
+ 
+ static void br_ip4_multicast_leave_group(struct net_bridge *br,
+ 					 struct net_bridge_port *port,
+-					 __be32 group,
+-					 __u16 vid)
++					 __be32 group, __u16 vid,
++					 const unsigned char *src)
+ {
+ 	struct br_ip br_group;
+ 
+@@ -1325,14 +1350,14 @@ static void br_ip4_multicast_leave_group
+ 	br_group.proto = htons(ETH_P_IP);
+ 	br_group.vid = vid;
+ 
+-	br_multicast_leave_group(br, port, &br_group);
++	br_multicast_leave_group(br, port, &br_group, src);
+ }
+ 
+ #if IS_ENABLED(CONFIG_IPV6)
+ static void br_ip6_multicast_leave_group(struct net_bridge *br,
+ 					 struct net_bridge_port *port,
+ 					 const struct in6_addr *group,
+-					 __u16 vid)
++					 __u16 vid, const unsigned char *src)
+ {
+ 	struct br_ip br_group;
+ 
+@@ -1343,7 +1368,7 @@ static void br_ip6_multicast_leave_group
+ 	br_group.proto = htons(ETH_P_IPV6);
+ 	br_group.vid = vid;
+ 
+-	br_multicast_leave_group(br, port, &br_group);
++	br_multicast_leave_group(br, port, &br_group, src);
+ }
+ #endif
+ 
+@@ -1351,6 +1376,7 @@ static int br_multicast_ipv4_rcv(struct 
+ 				 struct net_bridge_port *port,
+ 				 struct sk_buff *skb)
+ {
++	const unsigned char *src = eth_hdr(skb)->h_source;
+ 	struct sk_buff *skb2 = skb;
+ 	const struct iphdr *iph;
+ 	struct igmphdr *ih;
+@@ -1426,7 +1452,7 @@ static int br_multicast_ipv4_rcv(struct 
+ 	case IGMP_HOST_MEMBERSHIP_REPORT:
+ 	case IGMPV2_HOST_MEMBERSHIP_REPORT:
+ 		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+-		err = br_ip4_multicast_add_group(br, port, ih->group, vid);
++		err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
+ 		break;
+ 	case IGMPV3_HOST_MEMBERSHIP_REPORT:
+ 		err = br_ip4_multicast_igmp3_report(br, port, skb2);
+@@ -1435,7 +1461,7 @@ static int br_multicast_ipv4_rcv(struct 
+ 		err = br_ip4_multicast_query(br, port, skb2);
+ 		break;
+ 	case IGMP_HOST_LEAVE_MESSAGE:
+-		br_ip4_multicast_leave_group(br, port, ih->group, vid);
++		br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
+ 		break;
+ 	}
+ 
+@@ -1452,6 +1478,7 @@ static int br_multicast_ipv6_rcv(struct 
+ 				 struct net_bridge_port *port,
+ 				 struct sk_buff *skb)
+ {
++	const unsigned char *src = eth_hdr(skb)->h_source;
+ 	struct sk_buff *skb2;
+ 	const struct ipv6hdr *ip6h;
+ 	u8 icmp6_type;
+@@ -1557,7 +1584,8 @@ static int br_multicast_ipv6_rcv(struct 
+ 		}
+ 		mld = (struct mld_msg *)skb_transport_header(skb2);
+ 		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+-		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
++		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
++						 src);
+ 		break;
+ 	    }
+ 	case ICMPV6_MLD2_REPORT:
+@@ -1574,7 +1602,7 @@ static int br_multicast_ipv6_rcv(struct 
+ 			goto out;
+ 		}
+ 		mld = (struct mld_msg *)skb_transport_header(skb2);
+-		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
++		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
+ 	    }
+ 	}
+ 
+--- a/net/bridge/br_private.h
++++ b/net/bridge/br_private.h
+@@ -101,6 +101,9 @@ struct net_bridge_port_group {
+ 	struct timer_list		timer;
+ 	struct br_ip			addr;
+ 	unsigned char			state;
++
++	unsigned char			eth_addr[ETH_ALEN];
++	bool				unicast;
+ };
+ 
+ struct net_bridge_mdb_entry
+@@ -158,6 +161,7 @@ struct net_bridge_port
+ #define BR_MULTICAST_FAST_LEAVE	0x00000008
+ #define BR_ADMIN_COST		0x00000010
+ #define BR_ISOLATE_MODE		0x00000020
++#define BR_MULTICAST_TO_UCAST	0x00000040
+ 
+ #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ 	u32				multicast_startup_queries_sent;
+@@ -469,7 +473,8 @@ extern struct net_bridge_port_group *br_
+ 				struct net_bridge_port *port,
+ 				struct br_ip *group,
+ 				struct net_bridge_port_group *next,
+-				unsigned char state);
++				unsigned char state,
++				const unsigned char *src);
+ extern void br_mdb_init(void);
+ extern void br_mdb_uninit(void);
+ extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
+--- a/net/bridge/br_mdb.c
++++ b/net/bridge/br_mdb.c
+@@ -340,7 +340,7 @@ static int br_mdb_add_group(struct net_b
+ 			break;
+ 	}
+ 
+-	p = br_multicast_new_port_group(port, group, *pp, state);
++	p = br_multicast_new_port_group(port, group, *pp, state, NULL);
+ 	if (unlikely(!p))
+ 		return -ENOMEM;
+ 	rcu_assign_pointer(*pp, p);
+--- a/net/bridge/br_forward.c
++++ b/net/bridge/br_forward.c
+@@ -170,6 +170,29 @@ out:
+ 	return p;
+ }
+ 
++static struct net_bridge_port *maybe_deliver_addr(
++	struct net_bridge_port *prev, struct net_bridge_port *p,
++	struct sk_buff *skb, const unsigned char *addr,
++	void (*__packet_hook)(const struct net_bridge_port *p,
++			      struct sk_buff *skb))
++{
++	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
++
++	if (!should_deliver(p, skb))
++		return prev;
++
++	skb = skb_copy(skb, GFP_ATOMIC);
++	if (!skb) {
++		dev->stats.tx_dropped++;
++		return prev;
++	}
++
++	memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
++	__packet_hook(p, skb);
++
++	return prev;
++}
++
+ /* called under bridge lock */
+ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
+ 		     struct sk_buff *skb0,
+@@ -232,6 +255,7 @@ static void br_multicast_flood(struct ne
+ 	struct net_bridge_port *prev = NULL;
+ 	struct net_bridge_port_group *p;
+ 	struct hlist_node *rp;
++	const unsigned char *addr;
+ 
+ 	rp = rcu_dereference(hlist_first_rcu(&br->router_list));
+ 	p = mdst ? rcu_dereference(mdst->ports) : NULL;
+@@ -242,10 +266,19 @@ static void br_multicast_flood(struct ne
+ 		rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
+ 			     NULL;
+ 
+-		port = (unsigned long)lport > (unsigned long)rport ?
+-		       lport : rport;
+-
+-		prev = maybe_deliver(prev, port, skb, __packet_hook);
++		if ((unsigned long)lport > (unsigned long)rport) {
++			port = lport;
++			addr = p->unicast ? p->eth_addr : NULL;
++		} else {
++			port = rport;
++			addr = NULL;
++		}
++
++		if (addr)
++			prev = maybe_deliver_addr(prev, port, skb, addr,
++						  __packet_hook);
++		else
++			prev = maybe_deliver(prev, port, skb, __packet_hook);
+ 		if (IS_ERR(prev))
+ 			goto out;
+ 
+--- a/net/bridge/br_sysfs_if.c
++++ b/net/bridge/br_sysfs_if.c
+@@ -190,6 +190,7 @@ static BRPORT_ATTR(multicast_router, S_I
+ 		   store_multicast_router);
+ 
+ BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
++BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UCAST);
+ #endif
+ 
+ static const struct brport_attribute *brport_attrs[] = {
+@@ -214,6 +215,7 @@ static const struct brport_attribute *br
+ #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ 	&brport_attr_multicast_router,
+ 	&brport_attr_multicast_fast_leave,
++	&brport_attr_multicast_to_unicast,
+ #endif
+ 	&brport_attr_isolate_mode,
+ 	NULL
diff --git a/target/linux/generic/patches-3.14/645-bridge_multicast_to_unicast.patch b/target/linux/generic/patches-3.14/645-bridge_multicast_to_unicast.patch
new file mode 100644
index 0000000000..b550120b7b
--- /dev/null
+++ b/target/linux/generic/patches-3.14/645-bridge_multicast_to_unicast.patch
@@ -0,0 +1,375 @@
+--- a/net/bridge/br_multicast.c
++++ b/net/bridge/br_multicast.c
+@@ -634,7 +634,8 @@ struct net_bridge_port_group *br_multica
+ 			struct net_bridge_port *port,
+ 			struct br_ip *group,
+ 			struct net_bridge_port_group __rcu *next,
+-			unsigned char state)
++			unsigned char state,
++			const unsigned char *src)
+ {
+ 	struct net_bridge_port_group *p;
+ 
+@@ -649,12 +650,33 @@ struct net_bridge_port_group *br_multica
+ 	hlist_add_head(&p->mglist, &port->mglist);
+ 	setup_timer(&p->timer, br_multicast_port_group_expired,
+ 		    (unsigned long)p);
++	if ((port->flags & BR_MULTICAST_TO_UCAST) && src) {
++		memcpy(p->eth_addr, src, ETH_ALEN);
++		p->unicast = true;
++	}
+ 	return p;
+ }
+ 
++static bool br_port_group_equal(struct net_bridge_port_group *p,
++				struct net_bridge_port *port,
++				const unsigned char *src)
++{
++	if (p->port != port)
++		return false;
++
++	if (!p->unicast)
++		return true;
++
++	if (!src)
++		return false;
++
++	return ether_addr_equal(src, p->eth_addr);
++}
++
+ static int br_multicast_add_group(struct net_bridge *br,
+ 				  struct net_bridge_port *port,
+-				  struct br_ip *group)
++				  struct br_ip *group,
++				  const unsigned char *src)
+ {
+ 	struct net_bridge_mdb_entry *mp;
+ 	struct net_bridge_port_group *p;
+@@ -681,13 +703,13 @@ static int br_multicast_add_group(struct
+ 	for (pp = &mp->ports;
+ 	     (p = mlock_dereference(*pp, br)) != NULL;
+ 	     pp = &p->next) {
+-		if (p->port == port)
++		if (br_port_group_equal(p, port, src))
+ 			goto found;
+ 		if ((unsigned long)p->port < (unsigned long)port)
+ 			break;
+ 	}
+ 
+-	p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY);
++	p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY, src);
+ 	if (unlikely(!p))
+ 		goto err;
+ 	rcu_assign_pointer(*pp, p);
+@@ -706,7 +728,7 @@ err:
+ static int br_ip4_multicast_add_group(struct net_bridge *br,
+ 				      struct net_bridge_port *port,
+ 				      __be32 group,
+-				      __u16 vid)
++				      __u16 vid, const unsigned char *src)
+ {
+ 	struct br_ip br_group;
+ 
+@@ -717,14 +739,14 @@ static int br_ip4_multicast_add_group(st
+ 	br_group.proto = htons(ETH_P_IP);
+ 	br_group.vid = vid;
+ 
+-	return br_multicast_add_group(br, port, &br_group);
++	return br_multicast_add_group(br, port, &br_group, src);
+ }
+ 
+ #if IS_ENABLED(CONFIG_IPV6)
+ static int br_ip6_multicast_add_group(struct net_bridge *br,
+ 				      struct net_bridge_port *port,
+ 				      const struct in6_addr *group,
+-				      __u16 vid)
++				      __u16 vid, const unsigned char *src)
+ {
+ 	struct br_ip br_group;
+ 
+@@ -735,7 +757,7 @@ static int br_ip6_multicast_add_group(st
+ 	br_group.proto = htons(ETH_P_IPV6);
+ 	br_group.vid = vid;
+ 
+-	return br_multicast_add_group(br, port, &br_group);
++	return br_multicast_add_group(br, port, &br_group, src);
+ }
+ #endif
+ 
+@@ -950,6 +972,7 @@ static int br_ip4_multicast_igmp3_report
+ 					 struct sk_buff *skb,
+ 					 u16 vid)
+ {
++	const unsigned char *src = eth_hdr(skb)->h_source;
+ 	struct igmpv3_report *ih;
+ 	struct igmpv3_grec *grec;
+ 	int i;
+@@ -993,7 +1016,7 @@ static int br_ip4_multicast_igmp3_report
+ 			continue;
+ 		}
+ 
+-		err = br_ip4_multicast_add_group(br, port, group, vid);
++		err = br_ip4_multicast_add_group(br, port, group, vid, src);
+ 		if (err)
+ 			break;
+ 	}
+@@ -1007,6 +1030,7 @@ static int br_ip6_multicast_mld2_report(
+ 					struct sk_buff *skb,
+ 					u16 vid)
+ {
++	const unsigned char *src = eth_hdr(skb)->h_source;
+ 	struct icmp6hdr *icmp6h;
+ 	struct mld2_grec *grec;
+ 	int i;
+@@ -1055,7 +1079,7 @@ static int br_ip6_multicast_mld2_report(
+ 		}
+ 
+ 		err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
+-						 vid);
++						 vid, src);
+ 		if (!err)
+ 			break;
+ 	}
+@@ -1319,7 +1343,8 @@ static void br_multicast_leave_group(str
+ 				     struct net_bridge_port *port,
+ 				     struct br_ip *group,
+ 				     struct bridge_mcast_querier *querier,
+-				     struct bridge_mcast_query *query)
++				     struct bridge_mcast_query *query,
++				     const unsigned char *src)
+ {
+ 	struct net_bridge_mdb_htable *mdb;
+ 	struct net_bridge_mdb_entry *mp;
+@@ -1369,7 +1394,7 @@ static void br_multicast_leave_group(str
+ 		for (pp = &mp->ports;
+ 		     (p = mlock_dereference(*pp, br)) != NULL;
+ 		     pp = &p->next) {
+-			if (p->port != port)
++			if (!br_port_group_equal(p, port, src))
+ 				continue;
+ 
+ 			rcu_assign_pointer(*pp, p->next);
+@@ -1403,7 +1428,7 @@ static void br_multicast_leave_group(str
+ 	for (p = mlock_dereference(mp->ports, br);
+ 	     p != NULL;
+ 	     p = mlock_dereference(p->next, br)) {
+-		if (p->port != port)
++		if (!br_port_group_equal(p, port, src))
+ 			continue;
+ 
+ 		if (!hlist_unhashed(&p->mglist) &&
+@@ -1421,8 +1446,8 @@ out:
+ 
+ static void br_ip4_multicast_leave_group(struct net_bridge *br,
+ 					 struct net_bridge_port *port,
+-					 __be32 group,
+-					 __u16 vid)
++					 __be32 group, __u16 vid,
++					 const unsigned char *src)
+ {
+ 	struct br_ip br_group;
+ 	struct bridge_mcast_query *query = port ? &port->ip4_query :
+@@ -1435,14 +1460,15 @@ static void br_ip4_multicast_leave_group
+ 	br_group.proto = htons(ETH_P_IP);
+ 	br_group.vid = vid;
+ 
+-	br_multicast_leave_group(br, port, &br_group, &br->ip4_querier, query);
++	br_multicast_leave_group(br, port, &br_group, &br->ip4_querier, query,
++				 src);
+ }
+ 
+ #if IS_ENABLED(CONFIG_IPV6)
+ static void br_ip6_multicast_leave_group(struct net_bridge *br,
+ 					 struct net_bridge_port *port,
+ 					 const struct in6_addr *group,
+-					 __u16 vid)
++					 __u16 vid, const unsigned char *src)
+ {
+ 	struct br_ip br_group;
+ 	struct bridge_mcast_query *query = port ? &port->ip6_query :
+@@ -1456,7 +1482,8 @@ static void br_ip6_multicast_leave_group
+ 	br_group.proto = htons(ETH_P_IPV6);
+ 	br_group.vid = vid;
+ 
+-	br_multicast_leave_group(br, port, &br_group, &br->ip6_querier, query);
++	br_multicast_leave_group(br, port, &br_group, &br->ip6_querier, query,
++				 src);
+ }
+ #endif
+ 
+@@ -1465,6 +1492,7 @@ static int br_multicast_ipv4_rcv(struct 
+ 				 struct sk_buff *skb,
+ 				 u16 vid)
+ {
++	const unsigned char *src = eth_hdr(skb)->h_source;
+ 	struct sk_buff *skb2 = skb;
+ 	const struct iphdr *iph;
+ 	struct igmphdr *ih;
+@@ -1538,7 +1566,7 @@ static int br_multicast_ipv4_rcv(struct 
+ 	case IGMP_HOST_MEMBERSHIP_REPORT:
+ 	case IGMPV2_HOST_MEMBERSHIP_REPORT:
+ 		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+-		err = br_ip4_multicast_add_group(br, port, ih->group, vid);
++		err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
+ 		break;
+ 	case IGMPV3_HOST_MEMBERSHIP_REPORT:
+ 		err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
+@@ -1547,7 +1575,7 @@ static int br_multicast_ipv4_rcv(struct 
+ 		err = br_ip4_multicast_query(br, port, skb2, vid);
+ 		break;
+ 	case IGMP_HOST_LEAVE_MESSAGE:
+-		br_ip4_multicast_leave_group(br, port, ih->group, vid);
++		br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
+ 		break;
+ 	}
+ 
+@@ -1565,6 +1593,7 @@ static int br_multicast_ipv6_rcv(struct 
+ 				 struct sk_buff *skb,
+ 				 u16 vid)
+ {
++	const unsigned char *src = eth_hdr(skb)->h_source;
+ 	struct sk_buff *skb2;
+ 	const struct ipv6hdr *ip6h;
+ 	u8 icmp6_type;
+@@ -1674,7 +1703,8 @@ static int br_multicast_ipv6_rcv(struct 
+ 		}
+ 		mld = (struct mld_msg *)skb_transport_header(skb2);
+ 		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+-		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid);
++		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
++						 src);
+ 		break;
+ 	    }
+ 	case ICMPV6_MLD2_REPORT:
+@@ -1691,7 +1721,7 @@ static int br_multicast_ipv6_rcv(struct 
+ 			goto out;
+ 		}
+ 		mld = (struct mld_msg *)skb_transport_header(skb2);
+-		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
++		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
+ 	    }
+ 	}
+ 
+--- a/net/bridge/br_private.h
++++ b/net/bridge/br_private.h
+@@ -116,6 +116,9 @@ struct net_bridge_port_group {
+ 	struct timer_list		timer;
+ 	struct br_ip			addr;
+ 	unsigned char			state;
++
++	unsigned char			eth_addr[ETH_ALEN];
++	bool				unicast;
+ };
+ 
+ struct net_bridge_mdb_entry
+@@ -175,6 +178,7 @@ struct net_bridge_port
+ #define BR_LEARNING		0x00000020
+ #define BR_FLOOD		0x00000040
+ #define BR_ISOLATE_MODE	0x00000080
++#define BR_MULTICAST_TO_UCAST	0x00000100
+ 
+ #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ 	struct bridge_mcast_query	ip4_query;
+@@ -468,7 +472,8 @@ void br_multicast_free_pg(struct rcu_hea
+ struct net_bridge_port_group *
+ br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
+ 			    struct net_bridge_port_group __rcu *next,
+-			    unsigned char state);
++			    unsigned char state,
++		       const unsigned char *src);
+ void br_mdb_init(void);
+ void br_mdb_uninit(void);
+ void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
+--- a/net/bridge/br_mdb.c
++++ b/net/bridge/br_mdb.c
+@@ -342,7 +342,7 @@ static int br_mdb_add_group(struct net_b
+ 			break;
+ 	}
+ 
+-	p = br_multicast_new_port_group(port, group, *pp, state);
++	p = br_multicast_new_port_group(port, group, *pp, state, NULL);
+ 	if (unlikely(!p))
+ 		return -ENOMEM;
+ 	rcu_assign_pointer(*pp, p);
+--- a/net/bridge/br_forward.c
++++ b/net/bridge/br_forward.c
+@@ -170,6 +170,29 @@ out:
+ 	return p;
+ }
+ 
++static struct net_bridge_port *maybe_deliver_addr(
++	struct net_bridge_port *prev, struct net_bridge_port *p,
++	struct sk_buff *skb, const unsigned char *addr,
++	void (*__packet_hook)(const struct net_bridge_port *p,
++			      struct sk_buff *skb))
++{
++	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
++
++	if (!should_deliver(p, skb))
++		return prev;
++
++	skb = skb_copy(skb, GFP_ATOMIC);
++	if (!skb) {
++		dev->stats.tx_dropped++;
++		return prev;
++	}
++
++	memcpy(eth_hdr(skb)->h_dest, addr, ETH_ALEN);
++	__packet_hook(p, skb);
++
++	return prev;
++}
++
+ /* called under bridge lock */
+ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
+ 		     struct sk_buff *skb0,
+@@ -234,6 +257,7 @@ static void br_multicast_flood(struct ne
+ 	struct net_bridge_port *prev = NULL;
+ 	struct net_bridge_port_group *p;
+ 	struct hlist_node *rp;
++	const unsigned char *addr;
+ 
+ 	rp = rcu_dereference(hlist_first_rcu(&br->router_list));
+ 	p = mdst ? rcu_dereference(mdst->ports) : NULL;
+@@ -244,10 +268,19 @@ static void br_multicast_flood(struct ne
+ 		rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
+ 			     NULL;
+ 
+-		port = (unsigned long)lport > (unsigned long)rport ?
+-		       lport : rport;
+-
+-		prev = maybe_deliver(prev, port, skb, __packet_hook);
++		if ((unsigned long)lport > (unsigned long)rport) {
++			port = lport;
++			addr = p->unicast ? p->eth_addr : NULL;
++		} else {
++			port = rport;
++			addr = NULL;
++		}
++
++		if (addr)
++			prev = maybe_deliver_addr(prev, port, skb, addr,
++						  __packet_hook);
++		else
++			prev = maybe_deliver(prev, port, skb, __packet_hook);
+ 		if (IS_ERR(prev))
+ 			goto out;
+ 
+--- a/net/bridge/br_sysfs_if.c
++++ b/net/bridge/br_sysfs_if.c
+@@ -192,6 +192,7 @@ static BRPORT_ATTR(multicast_router, S_I
+ 		   store_multicast_router);
+ 
+ BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
++BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UCAST);
+ #endif
+ 
+ static const struct brport_attribute *brport_attrs[] = {
+@@ -218,6 +219,7 @@ static const struct brport_attribute *br
+ #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
+ 	&brport_attr_multicast_router,
+ 	&brport_attr_multicast_fast_leave,
++	&brport_attr_multicast_to_unicast,
+ #endif
+ 	&brport_attr_isolate_mode,
+ 	NULL