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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 | |
bda7bb46 | 10 | #define GRE_IP_PROTO_MAX 2 |
00959ade DK |
11 | |
12 | struct gre_protocol { | |
13 | int (*handler)(struct sk_buff *skb); | |
14 | void (*err_handler)(struct sk_buff *skb, u32 info); | |
15 | }; | |
16 | ||
c5441932 PS |
17 | struct gre_base_hdr { |
18 | __be16 flags; | |
19 | __be16 protocol; | |
20 | }; | |
21 | #define GRE_HEADER_SECTION 4 | |
22 | ||
00959ade DK |
23 | int gre_add_protocol(const struct gre_protocol *proto, u8 version); |
24 | int gre_del_protocol(const struct gre_protocol *proto, u8 version); | |
25 | ||
bda7bb46 PS |
26 | struct gre_cisco_protocol { |
27 | int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi); | |
28 | int (*err_handler)(struct sk_buff *skb, u32 info, | |
29 | const struct tnl_ptk_info *tpi); | |
30 | u8 priority; | |
31 | }; | |
32 | ||
33 | int gre_cisco_register(struct gre_cisco_protocol *proto); | |
34 | int gre_cisco_unregister(struct gre_cisco_protocol *proto); | |
c50cd357 | 35 | |
752f36da PS |
36 | void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
37 | int hdr_len); | |
2d26f0a3 ED |
38 | |
39 | static inline struct sk_buff *gre_handle_offloads(struct sk_buff *skb, | |
40 | bool gre_csum) | |
41 | { | |
42 | return iptunnel_handle_offloads(skb, gre_csum, SKB_GSO_GRE); | |
43 | } | |
44 | ||
bda7bb46 PS |
45 | |
46 | static inline int ip_gre_calc_hlen(__be16 o_flags) | |
47 | { | |
48 | int addend = 4; | |
49 | ||
50 | if (o_flags&TUNNEL_CSUM) | |
51 | addend += 4; | |
52 | if (o_flags&TUNNEL_KEY) | |
53 | addend += 4; | |
54 | if (o_flags&TUNNEL_SEQ) | |
55 | addend += 4; | |
56 | return addend; | |
57 | } | |
58 | ||
c5441932 PS |
59 | static inline __be16 gre_flags_to_tnl_flags(__be16 flags) |
60 | { | |
61 | __be16 tflags = 0; | |
62 | ||
63 | if (flags & GRE_CSUM) | |
64 | tflags |= TUNNEL_CSUM; | |
65 | if (flags & GRE_ROUTING) | |
66 | tflags |= TUNNEL_ROUTING; | |
67 | if (flags & GRE_KEY) | |
68 | tflags |= TUNNEL_KEY; | |
69 | if (flags & GRE_SEQ) | |
70 | tflags |= TUNNEL_SEQ; | |
71 | if (flags & GRE_STRICT) | |
72 | tflags |= TUNNEL_STRICT; | |
73 | if (flags & GRE_REC) | |
74 | tflags |= TUNNEL_REC; | |
75 | if (flags & GRE_VERSION) | |
76 | tflags |= TUNNEL_VERSION; | |
77 | ||
78 | return tflags; | |
79 | } | |
80 | ||
81 | static inline __be16 tnl_flags_to_gre_flags(__be16 tflags) | |
82 | { | |
83 | __be16 flags = 0; | |
84 | ||
85 | if (tflags & TUNNEL_CSUM) | |
86 | flags |= GRE_CSUM; | |
87 | if (tflags & TUNNEL_ROUTING) | |
88 | flags |= GRE_ROUTING; | |
89 | if (tflags & TUNNEL_KEY) | |
90 | flags |= GRE_KEY; | |
91 | if (tflags & TUNNEL_SEQ) | |
92 | flags |= GRE_SEQ; | |
93 | if (tflags & TUNNEL_STRICT) | |
94 | flags |= GRE_STRICT; | |
95 | if (tflags & TUNNEL_REC) | |
96 | flags |= GRE_REC; | |
97 | if (tflags & TUNNEL_VERSION) | |
98 | flags |= GRE_VERSION; | |
99 | ||
100 | return flags; | |
101 | } | |
102 | ||
00959ade | 103 | #endif |