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Commit 6229e362 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

bridge: eliminate call by reference 



Change the bridging hook to be simple function with return value
rather than modifying the skb argument. This could generate better
code and is cleaner.

Signed-off-by: default avatarStephen Hemminger <shemminger@linux-foundation.org>
parent 60476372

include/linux/if_bridge.h

+2 −1
Original line number Diff line number Diff line
@@ -105,7 +105,8 @@ struct __fdb_entry 
#include <linux/netdevice.h>



extern void brioctl_set(int (*ioctl_hook)(unsigned int, void __user *));

extern int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);

extern struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,

					       struct sk_buff *skb);

extern int (*br_should_route_hook)(struct sk_buff **pskb);



#endif

net/bridge/br_input.c

+9 −11
Original line number Diff line number Diff line
@@ -121,13 +121,11 @@ static inline int is_link_local(const unsigned char *dest) 


/*

 * Called via br_handle_frame_hook.

 * Return 0 if *pskb should be processed furthur

 *	  1 if *pskb is handled

 * Return NULL if skb is handled

 * note: already called with rcu_read_lock (preempt_disabled)

 */

int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)

struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)

{

	struct sk_buff *skb = *pskb;

	const unsigned char *dest = eth_hdr(skb)->h_dest;



	if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
@@ -135,15 +133,15 @@ int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb) 


	if (unlikely(is_link_local(dest))) {

		skb->pkt_type = PACKET_HOST;

		return NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,

			       NULL, br_handle_local_finish) != 0;



		return (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,

				NULL, br_handle_local_finish) == 0) ? skb : NULL;

	}



	if (p->state == BR_STATE_FORWARDING || p->state == BR_STATE_LEARNING) {

		if (br_should_route_hook) {

			if (br_should_route_hook(pskb))

				return 0;

			skb = *pskb;

			if (br_should_route_hook(&skb))

				return skb;

			dest = eth_hdr(skb)->h_dest;

		}
@@ -152,10 +150,10 @@ int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb) 


		NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,

			br_handle_frame_finish);

		return 1;

		return NULL;

	}



err:

	kfree_skb(skb);

	return 1;

	return NULL;

}

net/bridge/br_private.h

+2 −1
Original line number Diff line number Diff line
@@ -182,7 +182,8 @@ extern void br_features_recompute(struct net_bridge *br); 


/* br_input.c */

extern int br_handle_frame_finish(struct sk_buff *skb);

extern int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb);

extern struct sk_buff *br_handle_frame(struct net_bridge_port *p,

				       struct sk_buff *skb);



/* br_ioctl.c */

extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);

net/core/dev.c

+19 −12
Original line number Diff line number Diff line
@@ -1687,31 +1687,37 @@ static inline int deliver_skb(struct sk_buff *skb, 
}



#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)

int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);

/* These hooks defined here for ATM */

struct net_bridge;

struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,

						unsigned char *addr);

void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);

void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;



static __inline__ int handle_bridge(struct sk_buff **pskb,

/*

 * If bridge module is loaded call bridging hook.

 *  returns NULL if packet was consumed.

 */

struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,

					struct sk_buff *skb) __read_mostly;

static inline struct sk_buff *handle_bridge(struct sk_buff *skb,

					    struct packet_type **pt_prev, int *ret,

					    struct net_device *orig_dev)

{

	struct net_bridge_port *port;



	if ((*pskb)->pkt_type == PACKET_LOOPBACK ||

	    (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)

		return 0;

	if (skb->pkt_type == PACKET_LOOPBACK ||

	    (port = rcu_dereference(skb->dev->br_port)) == NULL)

		return skb;



	if (*pt_prev) {

		*ret = deliver_skb(*pskb, *pt_prev, orig_dev);

		*ret = deliver_skb(skb, *pt_prev, orig_dev);

		*pt_prev = NULL;

	}



	return br_handle_frame_hook(port, pskb);

	return br_handle_frame_hook(port, skb);

}

#else

#define handle_bridge(skb, pt_prev, ret, orig_dev)	(0)

#define handle_bridge(skb, pt_prev, ret, orig_dev)	(skb)

#endif



#ifdef CONFIG_NET_CLS_ACT
@@ -1818,7 +1824,8 @@ int netif_receive_skb(struct sk_buff *skb) 
ncls:

#endif



	if (handle_bridge(&skb, &pt_prev, &ret, orig_dev))

	skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);

	if (!skb)

		goto out;



	type = skb->protocol;