Merge branch 'bridge_flags'

Vlad Yasevich says:

====================
The following series adds 2 new flags to bridge.  One flag allows
the user to control whether mac learning is performed on the interface
or not.  By default mac learning is on.
The other flag allows the user to control whether unicast traffic
is flooded (send without an fdb) to a given unicast port.  Default is
on.

Changes since v4:
 - Implemented Stephen's suggestions.

Changes since v2:
 - removed unused "unlock" tag.

Changes since v1:
 - Integrated suggestion from MST to not impact RTM_NEWNEIGH and to
   skip lookups when learning is disabled.

Vlad Yasevich (2):
  bridge: Add flag to control mac learning.
  bridge: Add a flag to control unicast packet flood.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

8 files changed, 44 insertions, 18 deletions

diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index b05823cae784..da05a2698cb5 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -221,6 +221,8 @@ enum {
 	IFLA_BRPORT_GUARD,	/* bpdu guard              */
 	IFLA_BRPORT_PROTECT,	/* root port protection    */
 	IFLA_BRPORT_FAST_LEAVE,	/* multicast fast leave    */
+	IFLA_BRPORT_LEARNING,	/* mac learning */
+	IFLA_BRPORT_UNICAST_FLOOD, /* flood unicast traffic */
 	__IFLA_BRPORT_MAX
 };
 #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index 75f3239130f8..2ef66781fedb 100644
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -58,10 +58,10 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 	skb_pull(skb, ETH_HLEN);
 
 	if (is_broadcast_ether_addr(dest))
-		br_flood_deliver(br, skb);
+		br_flood_deliver(br, skb, false);
 	else if (is_multicast_ether_addr(dest)) {
 		if (unlikely(netpoll_tx_running(dev))) {
-			br_flood_deliver(br, skb);
+			br_flood_deliver(br, skb, false);
 			goto out;
 		}
 		if (br_multicast_rcv(br, NULL, skb)) {
@@ -73,11 +73,11 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
 		if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb))
 			br_multicast_deliver(mdst, skb);
 		else
-			br_flood_deliver(br, skb);
+			br_flood_deliver(br, skb, false);
 	} else if ((dst = __br_fdb_get(br, dest, vid)) != NULL)
 		br_deliver(dst->dst, skb);
 	else
-		br_flood_deliver(br, skb);
+		br_flood_deliver(br, skb, true);
 
 out:
 	rcu_read_unlock();
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 092b20e4ee4c..4b81b1471789 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -174,7 +174,8 @@ out:
 static void br_flood(struct net_bridge *br, struct sk_buff *skb,
 		     struct sk_buff *skb0,
 		     void (*__packet_hook)(const struct net_bridge_port *p,
-					   struct sk_buff *skb))
+					   struct sk_buff *skb),
+		     bool unicast)
 {
 	struct net_bridge_port *p;
 	struct net_bridge_port *prev;
@@ -182,6 +183,9 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
 	prev = NULL;
 
 	list_for_each_entry_rcu(p, &br->port_list, list) {
+		/* Do not flood unicast traffic to ports that turn it off */
+		if (unicast && !(p->flags & BR_FLOOD))
+			continue;
 		prev = maybe_deliver(prev, p, skb, __packet_hook);
 		if (IS_ERR(prev))
 			goto out;
@@ -203,16 +207,16 @@ out:
 
 
 /* called with rcu_read_lock */
-void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb)
+void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast)
 {
-	br_flood(br, skb, NULL, __br_deliver);
+	br_flood(br, skb, NULL, __br_deliver, unicast);
 }
 
 /* called under bridge lock */
 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
-		      struct sk_buff *skb2)
+		      struct sk_buff *skb2, bool unicast)
 {
-	br_flood(br, skb, skb2, __br_forward);
+	br_flood(br, skb, skb2, __br_forward, unicast);
 }
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
index 4cdba60926ff..5623be6b9ecd 100644
--- a/net/bridge/br_if.c
+++ b/net/bridge/br_if.c
@@ -221,7 +221,7 @@ static struct net_bridge_port *new_nbp(struct net_bridge *br,
 	p->path_cost = port_cost(dev);
 	p->priority = 0x8000 >> BR_PORT_BITS;
 	p->port_no = index;
-	p->flags = 0;
+	p->flags = BR_LEARNING | BR_FLOOD;
 	br_init_port(p);
 	p->state = BR_STATE_DISABLED;
 	br_stp_port_timer_init(p);
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 828e2bcc1f52..1b8b8b824cd7 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -65,6 +65,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
 	struct net_bridge_fdb_entry *dst;
 	struct net_bridge_mdb_entry *mdst;
 	struct sk_buff *skb2;
+	bool unicast = true;
 	u16 vid = 0;
 
 	if (!p || p->state == BR_STATE_DISABLED)
@@ -75,7 +76,8 @@ int br_handle_frame_finish(struct sk_buff *skb)
 
 	/* insert into forwarding database after filtering to avoid spoofing */
 	br = p->br;
-	br_fdb_update(br, p, eth_hdr(skb)->h_source, vid);
+	if (p->flags & BR_LEARNING)
+		br_fdb_update(br, p, eth_hdr(skb)->h_source, vid);
 
 	if (!is_broadcast_ether_addr(dest) && is_multicast_ether_addr(dest) &&
 	    br_multicast_rcv(br, p, skb))
@@ -94,9 +96,10 @@ int br_handle_frame_finish(struct sk_buff *skb)
 
 	dst = NULL;
 
-	if (is_broadcast_ether_addr(dest))
+	if (is_broadcast_ether_addr(dest)) {
 		skb2 = skb;
-	else if (is_multicast_ether_addr(dest)) {
+		unicast = false;
+	} else if (is_multicast_ether_addr(dest)) {
 		mdst = br_mdb_get(br, skb, vid);
 		if (mdst || BR_INPUT_SKB_CB_MROUTERS_ONLY(skb)) {
 			if ((mdst && mdst->mglist) ||
@@ -109,6 +112,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
 		} else
 			skb2 = skb;
 
+		unicast = false;
 		br->dev->stats.multicast++;
 	} else if ((dst = __br_fdb_get(br, dest, vid)) &&
 			dst->is_local) {
@@ -122,7 +126,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
 			dst->used = jiffies;
 			br_forward(dst->dst, skb, skb2);
 		} else
-			br_flood_forward(br, skb, skb2);
+			br_flood_forward(br, skb, skb2, unicast);
 	}
 
 	if (skb2)
@@ -142,7 +146,8 @@ static int br_handle_local_finish(struct sk_buff *skb)
 	u16 vid = 0;
 
 	br_vlan_get_tag(skb, &vid);
-	br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid);
+	if (p->flags & BR_LEARNING)
+		br_fdb_update(p->br, p, eth_hdr(skb)->h_source, vid);
 	return 0;	 /* process further */
 }
 
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
index 8e3abf564798..1fc30abd3a52 100644
--- a/net/bridge/br_netlink.c
+++ b/net/bridge/br_netlink.c
@@ -30,6 +30,8 @@ static inline size_t br_port_info_size(void)
 		+ nla_total_size(1)	/* IFLA_BRPORT_GUARD */
 		+ nla_total_size(1)	/* IFLA_BRPORT_PROTECT */
 		+ nla_total_size(1)	/* IFLA_BRPORT_FAST_LEAVE */
+		+ nla_total_size(1)	/* IFLA_BRPORT_LEARNING */
+		+ nla_total_size(1)	/* IFLA_BRPORT_UNICAST_FLOOD */
 		+ 0;
 }
 
@@ -56,7 +58,9 @@ static int br_port_fill_attrs(struct sk_buff *skb,
 	    nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
 	    nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
 	    nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
-	    nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)))
+	    nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
+	    nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
+	    nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)))
 		return -EMSGSIZE;
 
 	return 0;
@@ -281,6 +285,8 @@ static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
 	[IFLA_BRPORT_MODE]	= { .type = NLA_U8 },
 	[IFLA_BRPORT_GUARD]	= { .type = NLA_U8 },
 	[IFLA_BRPORT_PROTECT]	= { .type = NLA_U8 },
+	[IFLA_BRPORT_LEARNING]	= { .type = NLA_U8 },
+	[IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
 };
 
 /* Change the state of the port and notify spanning tree */
@@ -328,6 +334,8 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
 	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
 	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
 	br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
+	br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
+	br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
 
 	if (tb[IFLA_BRPORT_COST]) {
 		err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1b0ac95a5c37..3be89b3ce17b 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -158,6 +158,8 @@ struct net_bridge_port
 #define BR_ROOT_BLOCK		0x00000004
 #define BR_MULTICAST_FAST_LEAVE	0x00000008
 #define BR_ADMIN_COST		0x00000010
+#define BR_LEARNING		0x00000020
+#define BR_FLOOD		0x00000040
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	u32				multicast_startup_queries_sent;
@@ -413,9 +415,10 @@ extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 extern void br_forward(const struct net_bridge_port *to,
 		struct sk_buff *skb, struct sk_buff *skb0);
 extern int br_forward_finish(struct sk_buff *skb);
-extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
+extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb,
+			     bool unicast);
 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
-			     struct sk_buff *skb2);
+			     struct sk_buff *skb2, bool unicast);
 
 /* br_if.c */
 extern void br_port_carrier_check(struct net_bridge_port *p);
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
index a1ef1b6e14dc..2a2cdb756d51 100644
--- a/net/bridge/br_sysfs_if.c
+++ b/net/bridge/br_sysfs_if.c
@@ -158,6 +158,8 @@ static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
+BRPORT_ATTR_FLAG(learning, BR_LEARNING);
+BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
 
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
@@ -195,6 +197,8 @@ static const struct brport_attribute *brport_attrs[] = {
 	&brport_attr_hairpin_mode,
 	&brport_attr_bpdu_guard,
 	&brport_attr_root_block,
+	&brport_attr_learning,
+	&brport_attr_unicast_flood,
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	&brport_attr_multicast_router,
 	&brport_attr_multicast_fast_leave,