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1da177e4 LT |
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 | ||
31 | enum 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 | ||
50 | static inline | |
51 | struct 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 */ | |
68 | static inline | |
69 | void 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 | ||
80 | static inline | |
81 | void 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). */ | |
93 | static inline | |
94 | int 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 | ||
105 | struct bridge_skb_cb { | |
106 | union { | |
107 | __u32 ipv4; | |
108 | } daddr; | |
109 | }; | |
110 | #endif /* CONFIG_BRIDGE_NETFILTER */ | |
111 | ||
112 | #endif /* __KERNEL__ */ | |
113 | #endif |