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
11struct gre_protocol {
12 int (*handler)(struct sk_buff *skb);
13 void (*err_handler)(struct sk_buff *skb, u32 info);
14};
15
16struct gre_base_hdr {
17 __be16 flags;
18 __be16 protocol;
19};
20#define GRE_HEADER_SECTION 4
21
22int gre_add_protocol(const struct gre_protocol *proto, u8 version);
23int gre_del_protocol(const struct gre_protocol *proto, u8 version);
24
25static 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
47static 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
69#endif