Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#ifndef __LINUX_GRE_H
2#define __LINUX_GRE_H
3
4#include <linux/skbuff.h>
5#include <net/ip_tunnels.h>
6
7#define GREPROTO_CISCO 0
8#define GREPROTO_PPTP 1
9#define GREPROTO_MAX 2
10#define GRE_IP_PROTO_MAX 2
11
12struct gre_protocol {
13 int (*handler)(struct sk_buff *skb);
14 void (*err_handler)(struct sk_buff *skb, u32 info);
15};
16
17struct gre_base_hdr {
18 __be16 flags;
19 __be16 protocol;
20};
21#define GRE_HEADER_SECTION 4
22
23int gre_add_protocol(const struct gre_protocol *proto, u8 version);
24int gre_del_protocol(const struct gre_protocol *proto, u8 version);
25
26struct 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
33int gre_cisco_register(struct gre_cisco_protocol *proto);
34int gre_cisco_unregister(struct gre_cisco_protocol *proto);
35
36int gre_offload_init(void);
37void gre_offload_exit(void);
38
39void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
40 int hdr_len);
41struct sk_buff *gre_handle_offloads(struct sk_buff *skb, bool gre_csum);
42
43static inline int ip_gre_calc_hlen(__be16 o_flags)
44{
45 int addend = 4;
46
47 if (o_flags&TUNNEL_CSUM)
48 addend += 4;
49 if (o_flags&TUNNEL_KEY)
50 addend += 4;
51 if (o_flags&TUNNEL_SEQ)
52 addend += 4;
53 return addend;
54}
55
56static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
57{
58 __be16 tflags = 0;
59
60 if (flags & GRE_CSUM)
61 tflags |= TUNNEL_CSUM;
62 if (flags & GRE_ROUTING)
63 tflags |= TUNNEL_ROUTING;
64 if (flags & GRE_KEY)
65 tflags |= TUNNEL_KEY;
66 if (flags & GRE_SEQ)
67 tflags |= TUNNEL_SEQ;
68 if (flags & GRE_STRICT)
69 tflags |= TUNNEL_STRICT;
70 if (flags & GRE_REC)
71 tflags |= TUNNEL_REC;
72 if (flags & GRE_VERSION)
73 tflags |= TUNNEL_VERSION;
74
75 return tflags;
76}
77
78static inline __be16 tnl_flags_to_gre_flags(__be16 tflags)
79{
80 __be16 flags = 0;
81
82 if (tflags & TUNNEL_CSUM)
83 flags |= GRE_CSUM;
84 if (tflags & TUNNEL_ROUTING)
85 flags |= GRE_ROUTING;
86 if (tflags & TUNNEL_KEY)
87 flags |= GRE_KEY;
88 if (tflags & TUNNEL_SEQ)
89 flags |= GRE_SEQ;
90 if (tflags & TUNNEL_STRICT)
91 flags |= GRE_STRICT;
92 if (tflags & TUNNEL_REC)
93 flags |= GRE_REC;
94 if (tflags & TUNNEL_VERSION)
95 flags |= GRE_VERSION;
96
97 return flags;
98}
99
100#endif