| Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 1 | #ifndef __LINUX_GRE_H |
| 2 | #define __LINUX_GRE_H |
| 3 | |
| 4 | #include <linux/skbuff.h> |
| Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 5 | #include <net/ip_tunnels.h> |
| Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 6 | |
| 7 | #define GREPROTO_CISCO 0 |
| 8 | #define GREPROTO_PPTP 1 |
| 9 | #define GREPROTO_MAX 2 |
| Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 10 | #define GRE_IP_PROTO_MAX 2 |
| Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 11 | |
| 12 | struct gre_protocol { |
| 13 | int (*handler)(struct sk_buff *skb); |
| 14 | void (*err_handler)(struct sk_buff *skb, u32 info); |
| 15 | }; |
| 16 | |
| Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 17 | struct gre_base_hdr { |
| 18 | __be16 flags; |
| 19 | __be16 protocol; |
| 20 | }; |
| 21 | #define GRE_HEADER_SECTION 4 |
| 22 | |
| Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 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 | |
| Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 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); |
| Daniel Borkmann | c50cd35 | 2013-07-01 19:24:00 +0200 | [diff] [blame] | 35 | |
| Pravin B Shelar | 752f36d | 2013-06-17 17:49:45 -0700 | [diff] [blame] | 36 | void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi, |
| 37 | int hdr_len); |
| Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 38 | |
| 39 | static inline struct sk_buff *gre_handle_offloads(struct sk_buff *skb, |
| Tom Herbert | 4749c09 | 2014-06-04 17:20:23 -0700 | [diff] [blame] | 40 | bool csum) |
| Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 41 | { |
| Tom Herbert | 4749c09 | 2014-06-04 17:20:23 -0700 | [diff] [blame] | 42 | return iptunnel_handle_offloads(skb, csum, |
| 43 | csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); |
| Eric Dumazet | 2d26f0a | 2013-10-19 11:42:55 -0700 | [diff] [blame] | 44 | } |
| 45 | |
| Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 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 | |
| Pravin B Shelar | c544193 | 2013-03-25 14:49:35 +0000 | [diff] [blame] | 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 | |
| Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 104 | #endif |