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00959ade DK |
1 | #ifndef __LINUX_GRE_H |
2 | #define __LINUX_GRE_H | |
3 | ||
4 | #include <linux/skbuff.h> | |
c5441932 | 5 | #include <net/ip_tunnels.h> |
00959ade DK |
6 | |
7 | #define GREPROTO_CISCO 0 | |
8 | #define GREPROTO_PPTP 1 | |
9 | #define GREPROTO_MAX 2 | |
10 | ||
11 | struct gre_protocol { | |
12 | int (*handler)(struct sk_buff *skb); | |
13 | void (*err_handler)(struct sk_buff *skb, u32 info); | |
14 | }; | |
15 | ||
c5441932 PS |
16 | struct gre_base_hdr { |
17 | __be16 flags; | |
18 | __be16 protocol; | |
19 | }; | |
20 | #define GRE_HEADER_SECTION 4 | |
21 | ||
00959ade DK |
22 | int gre_add_protocol(const struct gre_protocol *proto, u8 version); |
23 | int gre_del_protocol(const struct gre_protocol *proto, u8 version); | |
24 | ||
c5441932 PS |
25 | static inline __be16 gre_flags_to_tnl_flags(__be16 flags) |
26 | { | |
27 | __be16 tflags = 0; | |
28 | ||
29 | if (flags & GRE_CSUM) | |
30 | tflags |= TUNNEL_CSUM; | |
31 | if (flags & GRE_ROUTING) | |
32 | tflags |= TUNNEL_ROUTING; | |
33 | if (flags & GRE_KEY) | |
34 | tflags |= TUNNEL_KEY; | |
35 | if (flags & GRE_SEQ) | |
36 | tflags |= TUNNEL_SEQ; | |
37 | if (flags & GRE_STRICT) | |
38 | tflags |= TUNNEL_STRICT; | |
39 | if (flags & GRE_REC) | |
40 | tflags |= TUNNEL_REC; | |
41 | if (flags & GRE_VERSION) | |
42 | tflags |= TUNNEL_VERSION; | |
43 | ||
44 | return tflags; | |
45 | } | |
46 | ||
47 | static inline __be16 tnl_flags_to_gre_flags(__be16 tflags) | |
48 | { | |
49 | __be16 flags = 0; | |
50 | ||
51 | if (tflags & TUNNEL_CSUM) | |
52 | flags |= GRE_CSUM; | |
53 | if (tflags & TUNNEL_ROUTING) | |
54 | flags |= GRE_ROUTING; | |
55 | if (tflags & TUNNEL_KEY) | |
56 | flags |= GRE_KEY; | |
57 | if (tflags & TUNNEL_SEQ) | |
58 | flags |= GRE_SEQ; | |
59 | if (tflags & TUNNEL_STRICT) | |
60 | flags |= GRE_STRICT; | |
61 | if (tflags & TUNNEL_REC) | |
62 | flags |= GRE_REC; | |
63 | if (tflags & TUNNEL_VERSION) | |
64 | flags |= GRE_VERSION; | |
65 | ||
66 | return flags; | |
67 | } | |
68 | ||
00959ade | 69 | #endif |