projects / mirror_ubuntu-zesty-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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, | |
| 4749c09c | 40 | bool csum) |
| 2d26f0a3 | 41 | { |
| 4749c09c TH |
42 | return iptunnel_handle_offloads(skb, csum, |
| 43 | csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); | |
| 2d26f0a3 ED |
44 | } |
| 45 | ||
| bda7bb46 PS |
46 | |
| 47 | static inline int ip_gre_calc_hlen(__be16 o_flags) | |
| 48 | { | |
| 49 | int addend = 4; | |
| 50 | ||
| 51 | if (o_flags&TUNNEL_CSUM) | |
| 52 | addend += 4; | |
| 53 | if (o_flags&TUNNEL_KEY) | |
| 54 | addend += 4; | |
| 55 | if (o_flags&TUNNEL_SEQ) | |
| 56 | addend += 4; | |
| 57 | return addend; | |
| 58 | } | |
| 59 | ||
| c5441932 PS |
60 | static inline __be16 gre_flags_to_tnl_flags(__be16 flags) |
| 61 | { | |
| 62 | __be16 tflags = 0; | |
| 63 | ||
| 64 | if (flags & GRE_CSUM) | |
| 65 | tflags |= TUNNEL_CSUM; | |
| 66 | if (flags & GRE_ROUTING) | |
| 67 | tflags |= TUNNEL_ROUTING; | |
| 68 | if (flags & GRE_KEY) | |
| 69 | tflags |= TUNNEL_KEY; | |
| 70 | if (flags & GRE_SEQ) | |
| 71 | tflags |= TUNNEL_SEQ; | |
| 72 | if (flags & GRE_STRICT) | |
| 73 | tflags |= TUNNEL_STRICT; | |
| 74 | if (flags & GRE_REC) | |
| 75 | tflags |= TUNNEL_REC; | |
| 76 | if (flags & GRE_VERSION) | |
| 77 | tflags |= TUNNEL_VERSION; | |
| 78 | ||
| 79 | return tflags; | |
| 80 | } | |
| 81 | ||
| 82 | static inline __be16 tnl_flags_to_gre_flags(__be16 tflags) | |
| 83 | { | |
| 84 | __be16 flags = 0; | |
| 85 | ||
| 86 | if (tflags & TUNNEL_CSUM) | |
| 87 | flags |= GRE_CSUM; | |
| 88 | if (tflags & TUNNEL_ROUTING) | |
| 89 | flags |= GRE_ROUTING; | |
| 90 | if (tflags & TUNNEL_KEY) | |
| 91 | flags |= GRE_KEY; | |
| 92 | if (tflags & TUNNEL_SEQ) | |
| 93 | flags |= GRE_SEQ; | |
| 94 | if (tflags & TUNNEL_STRICT) | |
| 95 | flags |= GRE_STRICT; | |
| 96 | if (tflags & TUNNEL_REC) | |
| 97 | flags |= GRE_REC; | |
| 98 | if (tflags & TUNNEL_VERSION) | |
| 99 | flags |= GRE_VERSION; | |
| 100 | ||
| 101 | return flags; | |
| 102 | } | |
| 103 | ||
| 00959ade | 104 | #endif |