Viewing file:  br_forward.c (2.98 KB) -rw-r--r--
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/*
* Forwarding decision
* Linux ethernet bridge
*
* Authors:
* Lennert Buytenhek <buytenh@gnu.org>
*
* $Id: br_forward.c,v 1.4 2001/08/14 22:05:57 davem Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/skbuff.h>
#include <linux/if_bridge.h>
#include <linux/netfilter_bridge.h>
#include "br_private.h"
static inline int should_deliver(struct net_bridge_port *p, struct sk_buff *skb)
{
if (skb->dev == p->dev ||
p->state != BR_STATE_FORWARDING)
return 0;
return 1;
}
static int __dev_queue_push_xmit(struct sk_buff *skb)
{
skb_push(skb, ETH_HLEN);
dev_queue_xmit(skb);
return 0;
}
static int __br_forward_finish(struct sk_buff *skb)
{
NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
__dev_queue_push_xmit);
return 0;
}
static void __br_deliver(struct net_bridge_port *to, struct sk_buff *skb)
{
struct net_device *indev;
indev = skb->dev;
skb->dev = to->dev;
NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, indev, skb->dev,
__br_forward_finish);
}
static void __br_forward(struct net_bridge_port *to, struct sk_buff *skb)
{
struct net_device *indev;
indev = skb->dev;
skb->dev = to->dev;
NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
__br_forward_finish);
}
/* called under bridge lock */
void br_deliver(struct net_bridge_port *to, struct sk_buff *skb)
{
if (should_deliver(to, skb)) {
__br_deliver(to, skb);
return;
}
kfree_skb(skb);
}
/* called under bridge lock */
void br_forward(struct net_bridge_port *to, struct sk_buff *skb)
{
if (should_deliver(to, skb)) {
__br_forward(to, skb);
return;
}
kfree_skb(skb);
}
/* called under bridge lock */
static void br_flood(struct net_bridge *br, struct sk_buff *skb, int clone,
void (*__packet_hook)(struct net_bridge_port *p, struct sk_buff *skb))
{
struct net_bridge_port *p;
struct net_bridge_port *prev;
if (clone) {
struct sk_buff *skb2;
if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
br->statistics.tx_dropped++;
return;
}
skb = skb2;
}
prev = NULL;
p = br->port_list;
while (p != NULL) {
if (should_deliver(p, skb)) {
if (prev != NULL) {
struct sk_buff *skb2;
if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
br->statistics.tx_dropped++;
kfree_skb(skb);
return;
}
__packet_hook(prev, skb2);
}
prev = p;
}
p = p->next;
}
if (prev != NULL) {
__packet_hook(prev, skb);
return;
}
kfree_skb(skb);
}
/* called under bridge lock */
void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, int clone)
{
br_flood(br, skb, clone, __br_deliver);
}
/* called under bridge lock */
void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, int clone)
{
br_flood(br, skb, clone, __br_forward);
}
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