projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 926b50f9 HW |
1 | #ifndef _CONNTRACK_PROTO_GRE_H |
| 2 | #define _CONNTRACK_PROTO_GRE_H | |
| 3 | #include <asm/byteorder.h> | |
| 4 | ||
| 5 | /* GRE PROTOCOL HEADER */ | |
| 6 | ||
| 7 | /* GRE Version field */ | |
| 8 | #define GRE_VERSION_1701 0x0 | |
| 9 | #define GRE_VERSION_PPTP 0x1 | |
| 10 | ||
| 11 | /* GRE Protocol field */ | |
| 12 | #define GRE_PROTOCOL_PPTP 0x880B | |
| 13 | ||
| 14 | /* GRE Flags */ | |
| 15 | #define GRE_FLAG_C 0x80 | |
| 16 | #define GRE_FLAG_R 0x40 | |
| 17 | #define GRE_FLAG_K 0x20 | |
| 18 | #define GRE_FLAG_S 0x10 | |
| 19 | #define GRE_FLAG_A 0x80 | |
| 20 | ||
| 21 | #define GRE_IS_C(f) ((f)&GRE_FLAG_C) | |
| 22 | #define GRE_IS_R(f) ((f)&GRE_FLAG_R) | |
| 23 | #define GRE_IS_K(f) ((f)&GRE_FLAG_K) | |
| 24 | #define GRE_IS_S(f) ((f)&GRE_FLAG_S) | |
| 25 | #define GRE_IS_A(f) ((f)&GRE_FLAG_A) | |
| 26 | ||
| 27 | /* GRE is a mess: Four different standards */ | |
| 28 | struct gre_hdr { | |
| 29 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
| 30 | __u16 rec:3, | |
| 31 | srr:1, | |
| 32 | seq:1, | |
| 33 | key:1, | |
| 34 | routing:1, | |
| 35 | csum:1, | |
| 36 | version:3, | |
| 37 | reserved:4, | |
| 38 | ack:1; | |
| 39 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
| 40 | __u16 csum:1, | |
| 41 | routing:1, | |
| 42 | key:1, | |
| 43 | seq:1, | |
| 44 | srr:1, | |
| 45 | rec:3, | |
| 46 | ack:1, | |
| 47 | reserved:4, | |
| 48 | version:3; | |
| 49 | #else | |
| 50 | #error "Adjust your <asm/byteorder.h> defines" | |
| 51 | #endif | |
| 52 | __u16 protocol; | |
| 53 | }; | |
| 54 | ||
| 55 | /* modified GRE header for PPTP */ | |
| 56 | struct gre_hdr_pptp { | |
| 57 | __u8 flags; /* bitfield */ | |
| 58 | __u8 version; /* should be GRE_VERSION_PPTP */ | |
| 59 | __u16 protocol; /* should be GRE_PROTOCOL_PPTP */ | |
| 60 | __u16 payload_len; /* size of ppp payload, not inc. gre header */ | |
| 61 | __u16 call_id; /* peer's call_id for this session */ | |
| 62 | __u32 seq; /* sequence number. Present if S==1 */ | |
| 63 | __u32 ack; /* seq number of highest packet recieved by */ | |
| 64 | /* sender in this session */ | |
| 65 | }; | |
| 66 | ||
| 67 | ||
| 68 | /* this is part of ip_conntrack */ | |
| 69 | struct ip_ct_gre { | |
| 70 | unsigned int stream_timeout; | |
| 71 | unsigned int timeout; | |
| 72 | }; | |
| 73 | ||
| 74 | #ifdef __KERNEL__ | |
| 75 | struct ip_conntrack_expect; | |
| 76 | struct ip_conntrack; | |
| 77 | ||
| 78 | /* structure for original <-> reply keymap */ | |
| 79 | struct ip_ct_gre_keymap { | |
| 80 | struct list_head list; | |
| 81 | ||
| 82 | struct ip_conntrack_tuple tuple; | |
| 83 | }; | |
| 84 | ||
| 85 | /* add new tuple->key_reply pair to keymap */ | |
| 86 | int ip_ct_gre_keymap_add(struct ip_conntrack *ct, | |
| 87 | struct ip_conntrack_tuple *t, | |
| 88 | int reply); | |
| 89 | ||
| 90 | /* delete keymap entries */ | |
| 91 | void ip_ct_gre_keymap_destroy(struct ip_conntrack *ct); | |
| 92 | ||
| 93 | ||
| 94 | /* get pointer to gre key, if present */ | |
| 95 | static inline u_int32_t *gre_key(struct gre_hdr *greh) | |
| 96 | { | |
| 97 | if (!greh->key) | |
| 98 | return NULL; | |
| 99 | if (greh->csum || greh->routing) | |
| 100 | return (u_int32_t *) (greh+sizeof(*greh)+4); | |
| 101 | return (u_int32_t *) (greh+sizeof(*greh)); | |
| 102 | } | |
| 103 | ||
| 104 | /* get pointer ot gre csum, if present */ | |
| 105 | static inline u_int16_t *gre_csum(struct gre_hdr *greh) | |
| 106 | { | |
| 107 | if (!greh->csum) | |
| 108 | return NULL; | |
| 109 | return (u_int16_t *) (greh+sizeof(*greh)); | |
| 110 | } | |
| 111 | ||
| 112 | #endif /* __KERNEL__ */ | |
| 113 | ||
| 114 | #endif /* _CONNTRACK_PROTO_GRE_H */ |