[NETFILTER] bridge: code rearrangement for clarity
[linux-2.6.git] / include / linux / netfilter_bridge.h
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
29 enum 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 */
50 extern int nf_bridge_copy_header(struct sk_buff *skb);
51 static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
52 {
53         if (skb->nf_bridge)
54                 return nf_bridge_copy_header(skb);
55         return 0;
56 }
57
58 /* This is called by the IP fragmenting code and it ensures there is
59  * enough room for the encapsulating header (if there is one). */
60 static inline
61 int nf_bridge_pad(struct sk_buff *skb)
62 {
63         if (skb->protocol == __constant_htons(ETH_P_IP))
64                 return 0;
65         if (skb->nf_bridge) {
66                 if (skb->protocol == __constant_htons(ETH_P_8021Q))
67                         return 4;
68         }
69         return 0;
70 }
71
72 struct bridge_skb_cb {
73         union {
74                 __u32 ipv4;
75         } daddr;
76 };
77
78 extern int brnf_deferred_hooks;
79 #else
80 #define nf_bridge_maybe_copy_header(skb)        (0)
81 #endif /* CONFIG_BRIDGE_NETFILTER */
82
83 #endif /* __KERNEL__ */
84 #endif