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/config.h>
8#include <linux/netfilter.h>
9#if defined(__KERNEL__) && defined(CONFIG_BRIDGE_NETFILTER)
10#include <asm/atomic.h>
11#include <linux/if_ether.h>
12#endif
13
14/* Bridge Hooks */
15/* After promisc drops, checksum checks. */
16#define NF_BR_PRE_ROUTING 0
17/* If the packet is destined for this box. */
18#define NF_BR_LOCAL_IN 1
19/* If the packet is destined for another interface. */
20#define NF_BR_FORWARD 2
21/* Packets coming from a local process. */
22#define NF_BR_LOCAL_OUT 3
23/* Packets about to hit the wire. */
24#define NF_BR_POST_ROUTING 4
25/* Not really a hook, but used for the ebtables broute table */
26#define NF_BR_BROUTING 5
27#define NF_BR_NUMHOOKS 6
28
29#ifdef __KERNEL__
30
31enum nf_br_hook_priorities {
32 NF_BR_PRI_FIRST = INT_MIN,
33 NF_BR_PRI_NAT_DST_BRIDGED = -300,
34 NF_BR_PRI_FILTER_BRIDGED = -200,
35 NF_BR_PRI_BRNF = 0,
36 NF_BR_PRI_NAT_DST_OTHER = 100,
37 NF_BR_PRI_FILTER_OTHER = 200,
38 NF_BR_PRI_NAT_SRC = 300,
39 NF_BR_PRI_LAST = INT_MAX,
40};
41
42#ifdef CONFIG_BRIDGE_NETFILTER
43
44#define BRNF_PKT_TYPE 0x01
45#define BRNF_BRIDGED_DNAT 0x02
46#define BRNF_DONT_TAKE_PARENT 0x04
47#define BRNF_BRIDGED 0x08
48#define BRNF_NF_BRIDGE_PREROUTING 0x10
49
50static inline
51struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
52{
53 struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
54
55 if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
56 atomic_set(&(*nf_bridge)->use, 1);
57 (*nf_bridge)->mask = 0;
58 (*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
59#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
60 (*nf_bridge)->netoutdev = NULL;
61#endif
62 }
63
64 return *nf_bridge;
65}
66
67/* Only used in br_forward.c */
68static inline
69void nf_bridge_maybe_copy_header(struct sk_buff *skb)
70{
71 if (skb->nf_bridge) {
72 if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
73 memcpy(skb->data - 18, skb->nf_bridge->data, 18);
74 skb_push(skb, 4);
75 } else
76 memcpy(skb->data - 16, skb->nf_bridge->data, 16);
77 }
78}
79
80static inline
81void nf_bridge_save_header(struct sk_buff *skb)
82{
83 int header_size = 16;
84
85 if (skb->protocol == __constant_htons(ETH_P_8021Q))
86 header_size = 18;
87
88 memcpy(skb->nf_bridge->data, skb->data - header_size, header_size);
89}
90
91/* This is called by the IP fragmenting code and it ensures there is
92 * enough room for the encapsulating header (if there is one). */
93static inline
94int nf_bridge_pad(struct sk_buff *skb)
95{
96 if (skb->protocol == __constant_htons(ETH_P_IP))
97 return 0;
98 if (skb->nf_bridge) {
99 if (skb->protocol == __constant_htons(ETH_P_8021Q))
100 return 4;
101 }
102 return 0;
103}
104
105struct bridge_skb_cb {
106 union {
107 __u32 ipv4;
108 } daddr;
109};
110#endif /* CONFIG_BRIDGE_NETFILTER */
111
112#endif /* __KERNEL__ */
113#endif