1 #ifndef __LINUX_BRIDGE_NETFILTER_H
2 #define __LINUX_BRIDGE_NETFILTER_H
4 /* bridge-specific defines for netfilter.
7 #include <linux/netfilter.h>
8 #if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER)
9 #include <linux/if_ether.h>
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
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,
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,
40 #ifdef CONFIG_BRIDGE_NETFILTER
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
49 /* Only used in br_forward.c */
51 int nf_bridge_maybe_copy_header(struct sk_buff *skb)
56 if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
57 err = skb_cow(skb, 18);
60 memcpy(skb->data - 18, skb->nf_bridge->data, 18);
63 err = skb_cow(skb, 16);
66 memcpy(skb->data - 16, skb->nf_bridge->data, 16);
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). */
75 int nf_bridge_pad(struct sk_buff *skb)
77 if (skb->protocol == __constant_htons(ETH_P_IP))
80 if (skb->protocol == __constant_htons(ETH_P_8021Q))
86 struct bridge_skb_cb {
92 extern int brnf_deferred_hooks;
93 #endif /* CONFIG_BRIDGE_NETFILTER */
95 #endif /* __KERNEL__ */