3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * $Id: br_forward.c,v 1.4 2001/08/14 22:05:57 davem Exp $
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
16 #include <linux/kernel.h>
17 #include <linux/netdevice.h>
18 #include <linux/skbuff.h>
19 #include <linux/netfilter_bridge.h>
20 #include "br_private.h"
22 static inline int should_deliver(const struct net_bridge_port *p,
23 const struct sk_buff *skb)
25 if (skb->dev == p->dev ||
26 p->state != BR_STATE_FORWARDING)
32 int br_dev_queue_push_xmit(struct sk_buff *skb)
34 #ifdef CONFIG_BRIDGE_NETFILTER
35 /* ip_refrag calls ip_fragment, which doesn't copy the MAC header. */
36 nf_bridge_maybe_copy_header(skb);
38 skb_push(skb, ETH_HLEN);
45 int br_forward_finish(struct sk_buff *skb)
47 NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
48 br_dev_queue_push_xmit);
53 static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
56 #ifdef CONFIG_NETFILTER_DEBUG
59 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
63 static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
65 struct net_device *indev;
69 skb->ip_summed = CHECKSUM_NONE;
71 NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
75 /* called with rcu_read_lock */
76 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
78 if (should_deliver(to, skb)) {
79 __br_deliver(to, skb);
86 /* called with rcu_read_lock */
87 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
89 if (should_deliver(to, skb)) {
90 __br_forward(to, skb);
97 /* called under bridge lock */
98 static void br_flood(struct net_bridge *br, struct sk_buff *skb, int clone,
99 void (*__packet_hook)(const struct net_bridge_port *p,
100 struct sk_buff *skb))
102 struct net_bridge_port *p;
103 struct net_bridge_port *prev;
106 struct sk_buff *skb2;
108 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
109 br->statistics.tx_dropped++;
118 list_for_each_entry_rcu(p, &br->port_list, list) {
119 if (should_deliver(p, skb)) {
121 struct sk_buff *skb2;
123 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
124 br->statistics.tx_dropped++;
129 __packet_hook(prev, skb2);
137 __packet_hook(prev, skb);
145 /* called with rcu_read_lock */
146 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, int clone)
148 br_flood(br, skb, clone, __br_deliver);
151 /* called under bridge lock */
152 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, int clone)
154 br_flood(br, skb, clone, __br_forward);