| 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 | |
| Pravin B Shelar | 9f57c67 | 2015-08-07 23:51:52 -0700 | [diff] [blame] | 7 | struct gre_base_hdr { |
| 8 | __be16 flags; |
| 9 | __be16 protocol; |
| 10 | }; |
| 11 | #define GRE_HEADER_SECTION 4 |
| 12 | |
| Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 13 | #define GREPROTO_CISCO 0 |
| 14 | #define GREPROTO_PPTP 1 |
| 15 | #define GREPROTO_MAX 2 |
| Pravin B Shelar | bda7bb4 | 2013-06-17 17:49:38 -0700 | [diff] [blame] | 16 | #define GRE_IP_PROTO_MAX 2 |
| Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 17 | |
| 18 | struct gre_protocol { |
| 19 | int (*handler)(struct sk_buff *skb); |
| 20 | void (*err_handler)(struct sk_buff *skb, u32 info); |
| 21 | }; |
| 22 | |
| 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 | b2acd1d | 2015-08-07 23:51:47 -0700 | [diff] [blame] | 26 | struct net_device *gretap_fb_dev_create(struct net *net, const char *name, |
| 27 | u8 name_assign_type); |
| Tom Herbert | 95f5c64 | 2016-04-29 17:12:16 -0700 | [diff] [blame^] | 28 | int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi, |
| 29 | bool *csum_err, int *hdr_len); |
| 30 | |
| 31 | static inline int gre_calc_hlen(__be16 o_flags) |
| 32 | { |
| 33 | int addend = 4; |
| 34 | |
| 35 | if (o_flags & TUNNEL_CSUM) |
| 36 | addend += 4; |
| 37 | if (o_flags & TUNNEL_KEY) |
| 38 | addend += 4; |
| 39 | if (o_flags & TUNNEL_SEQ) |
| 40 | addend += 4; |
| 41 | return addend; |
| 42 | } |
| 43 | |
| 44 | static inline __be16 gre_flags_to_tnl_flags(__be16 flags) |
| 45 | { |
| 46 | __be16 tflags = 0; |
| 47 | |
| 48 | if (flags & GRE_CSUM) |
| 49 | tflags |= TUNNEL_CSUM; |
| 50 | if (flags & GRE_ROUTING) |
| 51 | tflags |= TUNNEL_ROUTING; |
| 52 | if (flags & GRE_KEY) |
| 53 | tflags |= TUNNEL_KEY; |
| 54 | if (flags & GRE_SEQ) |
| 55 | tflags |= TUNNEL_SEQ; |
| 56 | if (flags & GRE_STRICT) |
| 57 | tflags |= TUNNEL_STRICT; |
| 58 | if (flags & GRE_REC) |
| 59 | tflags |= TUNNEL_REC; |
| 60 | if (flags & GRE_VERSION) |
| 61 | tflags |= TUNNEL_VERSION; |
| 62 | |
| 63 | return tflags; |
| 64 | } |
| 65 | |
| 66 | static inline __be16 gre_tnl_flags_to_gre_flags(__be16 tflags) |
| 67 | { |
| 68 | __be16 flags = 0; |
| 69 | |
| 70 | if (tflags & TUNNEL_CSUM) |
| 71 | flags |= GRE_CSUM; |
| 72 | if (tflags & TUNNEL_ROUTING) |
| 73 | flags |= GRE_ROUTING; |
| 74 | if (tflags & TUNNEL_KEY) |
| 75 | flags |= GRE_KEY; |
| 76 | if (tflags & TUNNEL_SEQ) |
| 77 | flags |= GRE_SEQ; |
| 78 | if (tflags & TUNNEL_STRICT) |
| 79 | flags |= GRE_STRICT; |
| 80 | if (tflags & TUNNEL_REC) |
| 81 | flags |= GRE_REC; |
| 82 | if (tflags & TUNNEL_VERSION) |
| 83 | flags |= GRE_VERSION; |
| 84 | |
| 85 | return flags; |
| 86 | } |
| 87 | |
| Dmitry Kozlov | 00959ad | 2010-08-21 23:05:39 -0700 | [diff] [blame] | 88 | #endif |