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Commit 5cb5e947 authored by Herbert Xu's avatar Herbert Xu Committed by David S. Miller
Browse files

bridge: Add multicast forwarding functions 



This patch adds code to perform selective multicast forwarding.

We forward multicast traffic to a set of ports plus all multicast
router ports.  In order to avoid duplications among these two
sets of ports, we order all ports by the numeric value of their
pointers.  The two lists are then walked in lock-step to eliminate
duplicates.

Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent eb1d1641

net/bridge/br_forward.c

+67 −0
Original line number Diff line number Diff line
@@ -186,3 +186,70 @@ void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, 
{

	br_flood(br, skb, skb2, __br_forward);

}



#ifdef CONFIG_BRIDGE_IGMP_SNOOPING

/* called with rcu_read_lock */

static void br_multicast_flood(struct net_bridge_mdb_entry *mdst,

			       struct sk_buff *skb, struct sk_buff *skb0,

			       void (*__packet_hook)(

					const struct net_bridge_port *p,

					struct sk_buff *skb))

{

	struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;

	struct net_bridge *br = netdev_priv(dev);

	struct net_bridge_port *port;

	struct net_bridge_port *lport, *rport;

	struct net_bridge_port *prev;

	struct net_bridge_port_group *p;

	struct hlist_node *rp;



	prev = NULL;



	rp = br->router_list.first;

	p = mdst ? mdst->ports : NULL;

	while (p || rp) {

		lport = p ? p->port : NULL;

		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 (IS_ERR(prev))

			goto out;



		if ((unsigned long)lport >= (unsigned long)port)

			p = p->next;

		if ((unsigned long)rport >= (unsigned long)port)

			rp = rp->next;

	}



	if (!prev)

		goto out;



	if (skb0)

		deliver_clone(prev, skb, __packet_hook);

	else

		__packet_hook(prev, skb);

	return;



out:

	if (!skb0)

		kfree_skb(skb);

}



/* called with rcu_read_lock */

void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,

			  struct sk_buff *skb)

{

	br_multicast_flood(mdst, skb, NULL, __br_deliver);

}



/* called with rcu_read_lock */

void br_multicast_forward(struct net_bridge_mdb_entry *mdst,

			  struct sk_buff *skb, struct sk_buff *skb2)

{

	br_multicast_flood(mdst, skb, skb2, __br_forward);

}

#endif

net/bridge/br_private.h

+15 −0
Original line number Diff line number Diff line
@@ -293,6 +293,10 @@ extern void br_multicast_disable_port(struct net_bridge_port *port); 
extern void br_multicast_init(struct net_bridge *br);

extern void br_multicast_open(struct net_bridge *br);

extern void br_multicast_stop(struct net_bridge *br);

extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,

				 struct sk_buff *skb);

extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,

				 struct sk_buff *skb, struct sk_buff *skb2);

#else

static inline int br_multicast_rcv(struct net_bridge *br,

				   struct net_bridge_port *port,
@@ -334,6 +338,17 @@ static inline void br_multicast_open(struct net_bridge *br) 
static inline void br_multicast_stop(struct net_bridge *br)

{

}



static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,

					struct sk_buff *skb)

{

}



static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,

					struct sk_buff *skb,

					struct sk_buff *skb2)

{

}

#endif



static inline bool br_multicast_is_router(struct net_bridge *br)