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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/bridge/br_forward.c
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 /* ip_refrag calls ip_fragment, doesn't copy the MAC header. */
42 if (nf_bridge_maybe_copy_header(skb
))
45 skb_push(skb
, ETH_HLEN
);
54 int br_forward_finish(struct sk_buff
*skb
)
56 return NF_HOOK(PF_BRIDGE
, NF_BR_POST_ROUTING
, skb
, NULL
, skb
->dev
,
57 br_dev_queue_push_xmit
);
61 static void __br_deliver(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
64 NF_HOOK(PF_BRIDGE
, NF_BR_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
68 static void __br_forward(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
70 struct net_device
*indev
;
74 skb_forward_csum(skb
);
76 NF_HOOK(PF_BRIDGE
, NF_BR_FORWARD
, skb
, indev
, skb
->dev
,
80 /* called with rcu_read_lock */
81 void br_deliver(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
83 if (should_deliver(to
, skb
)) {
84 __br_deliver(to
, skb
);
91 /* called with rcu_read_lock */
92 void br_forward(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
94 if (should_deliver(to
, skb
)) {
95 __br_forward(to
, skb
);
102 /* called under bridge lock */
103 static void br_flood(struct net_bridge
*br
, struct sk_buff
*skb
,
104 void (*__packet_hook
)(const struct net_bridge_port
*p
,
105 struct sk_buff
*skb
))
107 struct net_bridge_port
*p
;
108 struct net_bridge_port
*prev
;
112 list_for_each_entry_rcu(p
, &br
->port_list
, list
) {
113 if (should_deliver(p
, skb
)) {
115 struct sk_buff
*skb2
;
117 if ((skb2
= skb_clone(skb
, GFP_ATOMIC
)) == NULL
) {
118 br
->statistics
.tx_dropped
++;
123 __packet_hook(prev
, skb2
);
131 __packet_hook(prev
, skb
);
139 /* called with rcu_read_lock */
140 void br_flood_deliver(struct net_bridge
*br
, struct sk_buff
*skb
)
142 br_flood(br
, skb
, __br_deliver
);
145 /* called under bridge lock */
146 void br_flood_forward(struct net_bridge
*br
, struct sk_buff
*skb
)
148 br_flood(br
, skb
, __br_forward
);