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/if_vlan.h>
20 #include <linux/netfilter_bridge.h>
21 #include "br_private.h"
23 /* Don't forward packets to originating port or forwarding diasabled */
24 static inline int should_deliver(const struct net_bridge_port
*p
,
25 const struct sk_buff
*skb
)
27 return (skb
->dev
!= p
->dev
&& p
->state
== BR_STATE_FORWARDING
);
30 static inline unsigned packet_length(const struct sk_buff
*skb
)
32 return skb
->len
- (skb
->protocol
== htons(ETH_P_8021Q
) ? VLAN_HLEN
: 0);
35 int br_dev_queue_push_xmit(struct sk_buff
*skb
)
37 /* drop mtu oversized packets except gso */
38 if (packet_length(skb
) > skb
->dev
->mtu
&& !skb_is_gso(skb
))
41 #ifdef CONFIG_BRIDGE_NETFILTER
42 /* ip_refrag calls ip_fragment, doesn't copy the MAC header. */
43 if (nf_bridge_maybe_copy_header(skb
))
48 skb_push(skb
, ETH_HLEN
);
57 int br_forward_finish(struct sk_buff
*skb
)
59 return NF_HOOK(PF_BRIDGE
, NF_BR_POST_ROUTING
, skb
, NULL
, skb
->dev
,
60 br_dev_queue_push_xmit
);
64 static void __br_deliver(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
67 NF_HOOK(PF_BRIDGE
, NF_BR_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
71 static void __br_forward(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
73 struct net_device
*indev
;
77 skb
->ip_summed
= CHECKSUM_NONE
;
79 NF_HOOK(PF_BRIDGE
, NF_BR_FORWARD
, skb
, indev
, skb
->dev
,
83 /* called with rcu_read_lock */
84 void br_deliver(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
86 if (should_deliver(to
, skb
)) {
87 __br_deliver(to
, skb
);
94 /* called with rcu_read_lock */
95 void br_forward(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
97 if (should_deliver(to
, skb
)) {
98 __br_forward(to
, skb
);
105 /* called under bridge lock */
106 static void br_flood(struct net_bridge
*br
, struct sk_buff
*skb
, int clone
,
107 void (*__packet_hook
)(const struct net_bridge_port
*p
,
108 struct sk_buff
*skb
))
110 struct net_bridge_port
*p
;
111 struct net_bridge_port
*prev
;
114 struct sk_buff
*skb2
;
116 if ((skb2
= skb_clone(skb
, GFP_ATOMIC
)) == NULL
) {
117 br
->statistics
.tx_dropped
++;
126 list_for_each_entry_rcu(p
, &br
->port_list
, list
) {
127 if (should_deliver(p
, skb
)) {
129 struct sk_buff
*skb2
;
131 if ((skb2
= skb_clone(skb
, GFP_ATOMIC
)) == NULL
) {
132 br
->statistics
.tx_dropped
++;
137 __packet_hook(prev
, skb2
);
145 __packet_hook(prev
, skb
);
153 /* called with rcu_read_lock */
154 void br_flood_deliver(struct net_bridge
*br
, struct sk_buff
*skb
, int clone
)
156 br_flood(br
, skb
, clone
, __br_deliver
);
159 /* called under bridge lock */
160 void br_flood_forward(struct net_bridge
*br
, struct sk_buff
*skb
, int clone
)
162 br_flood(br
, skb
, clone
, __br_forward
);