Linux kernel mirror (for testing)
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linux
1#ifndef __LINUX_BRIDGE_NETFILTER_H
2#define __LINUX_BRIDGE_NETFILTER_H
3
4/* bridge-specific defines for netfilter.
5 */
6
7#include <linux/netfilter.h>
8#if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER)
9#include <linux/if_ether.h>
10#endif
11
12/* Bridge Hooks */
13/* After promisc drops, checksum checks. */
14#define NF_BR_PRE_ROUTING 0
15/* If the packet is destined for this box. */
16#define NF_BR_LOCAL_IN 1
17/* If the packet is destined for another interface. */
18#define NF_BR_FORWARD 2
19/* Packets coming from a local process. */
20#define NF_BR_LOCAL_OUT 3
21/* Packets about to hit the wire. */
22#define NF_BR_POST_ROUTING 4
23/* Not really a hook, but used for the ebtables broute table */
24#define NF_BR_BROUTING 5
25#define NF_BR_NUMHOOKS 6
26
27#ifdef __KERNEL__
28
29enum nf_br_hook_priorities {
30 NF_BR_PRI_FIRST = INT_MIN,
31 NF_BR_PRI_NAT_DST_BRIDGED = -300,
32 NF_BR_PRI_FILTER_BRIDGED = -200,
33 NF_BR_PRI_BRNF = 0,
34 NF_BR_PRI_NAT_DST_OTHER = 100,
35 NF_BR_PRI_FILTER_OTHER = 200,
36 NF_BR_PRI_NAT_SRC = 300,
37 NF_BR_PRI_LAST = INT_MAX,
38};
39
40#ifdef CONFIG_BRIDGE_NETFILTER
41
42#define BRNF_PKT_TYPE 0x01
43#define BRNF_BRIDGED_DNAT 0x02
44#define BRNF_DONT_TAKE_PARENT 0x04
45#define BRNF_BRIDGED 0x08
46#define BRNF_NF_BRIDGE_PREROUTING 0x10
47
48
49/* Only used in br_forward.c */
50static inline
51int nf_bridge_maybe_copy_header(struct sk_buff *skb)
52{
53 int err;
54
55 if (skb->nf_bridge) {
56 if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
57 err = skb_cow(skb, 18);
58 if (err)
59 return err;
60 memcpy(skb->data - 18, skb->nf_bridge->data, 18);
61 skb_push(skb, 4);
62 } else {
63 err = skb_cow(skb, 16);
64 if (err)
65 return err;
66 memcpy(skb->data - 16, skb->nf_bridge->data, 16);
67 }
68 }
69 return 0;
70}
71
72/* This is called by the IP fragmenting code and it ensures there is
73 * enough room for the encapsulating header (if there is one). */
74static inline
75int nf_bridge_pad(struct sk_buff *skb)
76{
77 if (skb->protocol == __constant_htons(ETH_P_IP))
78 return 0;
79 if (skb->nf_bridge) {
80 if (skb->protocol == __constant_htons(ETH_P_8021Q))
81 return 4;
82 }
83 return 0;
84}
85
86struct bridge_skb_cb {
87 union {
88 __u32 ipv4;
89 } daddr;
90};
91
92extern int brnf_deferred_hooks;
93#endif /* CONFIG_BRIDGE_NETFILTER */
94
95#endif /* __KERNEL__ */
96#endif