Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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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#include <linux/if_ether.h>
9#include <linux/if_vlan.h>
10#include <linux/if_pppox.h>
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_BRIDGED 0x04
45#define BRNF_NF_BRIDGE_PREROUTING 0x08
46#define BRNF_8021Q 0x10
47#define BRNF_PPPoE 0x20
48
49/* Only used in br_forward.c */
50extern int nf_bridge_copy_header(struct sk_buff *skb);
51static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
52{
53 if (skb->nf_bridge &&
54 skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
55 return nf_bridge_copy_header(skb);
56 return 0;
57}
58
59static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
60{
61 switch (skb->protocol) {
62 case __cpu_to_be16(ETH_P_8021Q):
63 return VLAN_HLEN;
64 case __cpu_to_be16(ETH_P_PPP_SES):
65 return PPPOE_SES_HLEN;
66 default:
67 return 0;
68 }
69}
70
71static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
72{
73 if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
74 return PPPOE_SES_HLEN;
75 return 0;
76}
77
78extern int br_handle_frame_finish(struct sk_buff *skb);
79/* Only used in br_device.c */
80static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
81{
82 struct nf_bridge_info *nf_bridge = skb->nf_bridge;
83
84 skb_pull(skb, ETH_HLEN);
85 nf_bridge->mask ^= BRNF_BRIDGED_DNAT;
86 skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
87 skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
88 skb->dev = nf_bridge->physindev;
89 return br_handle_frame_finish(skb);
90}
91
92/* This is called by the IP fragmenting code and it ensures there is
93 * enough room for the encapsulating header (if there is one). */
94static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
95{
96 if (skb->nf_bridge)
97 return nf_bridge_encap_header_len(skb);
98 return 0;
99}
100
101struct bridge_skb_cb {
102 union {
103 __be32 ipv4;
104 } daddr;
105};
106
107#else
108#define nf_bridge_maybe_copy_header(skb) (0)
109#define nf_bridge_pad(skb) (0)
110#endif /* CONFIG_BRIDGE_NETFILTER */
111
112#endif /* __KERNEL__ */
113#endif