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 /* drop mtu oversized packets except tso */
35 if (skb->len > skb->dev->mtu && !skb_shinfo(skb)->tso_size)
38 #ifdef CONFIG_BRIDGE_NETFILTER
39 /* ip_refrag calls ip_fragment, doesn't copy the MAC header. */
40 if (nf_bridge_maybe_copy_header(skb))
45 skb_push(skb, ETH_HLEN);
54 int br_forward_finish(struct sk_buff *skb)
56 NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
57 br_dev_queue_push_xmit);
62 static void __br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
65 NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
69 static void __br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
71 struct net_device *indev;
75 skb->ip_summed = CHECKSUM_NONE;
77 NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
81 /* called with rcu_read_lock */
82 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb)
84 if (should_deliver(to, skb)) {
85 __br_deliver(to, skb);
92 /* called with rcu_read_lock */
93 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
95 if (should_deliver(to, skb)) {
96 __br_forward(to, skb);
103 /* called under bridge lock */
104 static void br_flood(struct net_bridge *br, struct sk_buff *skb, int clone,
105 void (*__packet_hook)(const struct net_bridge_port *p,
106 struct sk_buff *skb))
108 struct net_bridge_port *p;
109 struct net_bridge_port *prev;
112 struct sk_buff *skb2;
114 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
115 br->statistics.tx_dropped++;
124 list_for_each_entry_rcu(p, &br->port_list, list) {
125 if (should_deliver(p, skb)) {
127 struct sk_buff *skb2;
129 if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
130 br->statistics.tx_dropped++;
135 __packet_hook(prev, skb2);
143 __packet_hook(prev, skb);
151 /* called with rcu_read_lock */
152 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, int clone)
154 br_flood(br, skb, clone, __br_deliver);
157 /* called under bridge lock */
158 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, int clone)
160 br_flood(br, skb, clone, __br_forward);