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bridge: eliminate call by reference

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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: Stephen Hemminger <shemminger@linux-foundation.org>
This commit is contained in:
Stephen Hemminger 2007-03-21 13:38:47 -07:00 committed by David S. Miller
parent 604763722c
commit 6229e362dd
4 changed files with 32 additions and 25 deletions
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3
include/linux/if_bridge.h
View File

@ -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

20
net/bridge/br_input.c
View File

@ -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;
}

3
net/bridge/br_private.h
View File

@ -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);

31
net/core/dev.c
View File

@ -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,
struct packet_type **pt_prev, int *ret,
struct net_device *orig_dev)
/*
* 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;