d61e6f741125bbd510d20237a8e76e4292802b77
3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #include <linux/err.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <linux/skbuff.h>
18 #include <linux/if_vlan.h>
19 #include <linux/netfilter_bridge.h>
20 #include "br_private.h"
22 /* Don't forward packets to originating port or forwarding diasabled */
23 static inline int should_deliver(const struct net_bridge_port
*p
,
24 const struct sk_buff
*skb
)
26 return (((p
->flags
& BR_HAIRPIN_MODE
) || skb
->dev
!= p
->dev
) &&
27 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
;
72 if (skb_warn_if_lro(skb
)) {
79 skb_forward_csum(skb
);
81 NF_HOOK(PF_BRIDGE
, NF_BR_FORWARD
, skb
, indev
, skb
->dev
,
85 /* called with rcu_read_lock */
86 void br_deliver(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
88 if (should_deliver(to
, skb
)) {
89 __br_deliver(to
, skb
);
96 /* called with rcu_read_lock */
97 void br_forward(const struct net_bridge_port
*to
, struct sk_buff
*skb
)
99 if (should_deliver(to
, skb
)) {
100 __br_forward(to
, skb
);
107 static int deliver_clone(struct net_bridge_port
*prev
, struct sk_buff
*skb
,
108 void (*__packet_hook
)(const struct net_bridge_port
*p
,
109 struct sk_buff
*skb
))
111 skb
= skb_clone(skb
, GFP_ATOMIC
);
113 struct net_device
*dev
= BR_INPUT_SKB_CB(skb
)->brdev
;
115 dev
->stats
.tx_dropped
++;
119 __packet_hook(prev
, skb
);
123 static struct net_bridge_port
*maybe_deliver(
124 struct net_bridge_port
*prev
, struct net_bridge_port
*p
,
126 void (*__packet_hook
)(const struct net_bridge_port
*p
,
127 struct sk_buff
*skb
))
131 if (!should_deliver(p
, skb
))
137 err
= deliver_clone(prev
, skb
, __packet_hook
);
145 /* called under bridge lock */
146 static void br_flood(struct net_bridge
*br
, struct sk_buff
*skb
,
147 struct sk_buff
*skb0
,
148 void (*__packet_hook
)(const struct net_bridge_port
*p
,
149 struct sk_buff
*skb
))
151 struct net_bridge_port
*p
;
152 struct net_bridge_port
*prev
;
156 list_for_each_entry_rcu(p
, &br
->port_list
, list
) {
157 prev
= maybe_deliver(prev
, p
, skb
, __packet_hook
);
166 deliver_clone(prev
, skb
, __packet_hook
);
168 __packet_hook(prev
, skb
);
177 /* called with rcu_read_lock */
178 void br_flood_deliver(struct net_bridge
*br
, struct sk_buff
*skb
)
180 br_flood(br
, skb
, NULL
, __br_deliver
);
183 /* called under bridge lock */
184 void br_flood_forward(struct net_bridge
*br
, struct sk_buff
*skb
,
185 struct sk_buff
*skb2
)
187 br_flood(br
, skb
, skb2
, __br_forward
);
190 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
191 /* called with rcu_read_lock */
192 static void br_multicast_flood(struct net_bridge_mdb_entry
*mdst
,
193 struct sk_buff
*skb
, struct sk_buff
*skb0
,
194 void (*__packet_hook
)(
195 const struct net_bridge_port
*p
,
196 struct sk_buff
*skb
))
198 struct net_device
*dev
= BR_INPUT_SKB_CB(skb
)->brdev
;
199 struct net_bridge
*br
= netdev_priv(dev
);
200 struct net_bridge_port
*port
;
201 struct net_bridge_port
*lport
, *rport
;
202 struct net_bridge_port
*prev
;
203 struct net_bridge_port_group
*p
;
204 struct hlist_node
*rp
;
208 rp
= br
->router_list
.first
;
209 p
= mdst
? mdst
->ports
: NULL
;
211 lport
= p
? p
->port
: NULL
;
212 rport
= rp
? hlist_entry(rp
, struct net_bridge_port
, rlist
) :
215 port
= (unsigned long)lport
> (unsigned long)rport
?
218 prev
= maybe_deliver(prev
, port
, skb
, __packet_hook
);
222 if ((unsigned long)lport
>= (unsigned long)port
)
224 if ((unsigned long)rport
>= (unsigned long)port
)
232 deliver_clone(prev
, skb
, __packet_hook
);
234 __packet_hook(prev
, skb
);
242 /* called with rcu_read_lock */
243 void br_multicast_deliver(struct net_bridge_mdb_entry
*mdst
,
246 br_multicast_flood(mdst
, skb
, NULL
, __br_deliver
);
249 /* called with rcu_read_lock */
250 void br_multicast_forward(struct net_bridge_mdb_entry
*mdst
,
251 struct sk_buff
*skb
, struct sk_buff
*skb2
)
253 br_multicast_flood(mdst
, skb
, skb2
, __br_forward
);
This page took 0.043758 seconds and 4 git commands to generate.