http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/linux/netfilter_ipv4/ip_conntrack_proto_gre.h

#ifndef _CONNTRACK_PROTO_GRE_H #define _CONNTRACK_PROTO_GRE_H #include <asm/byteorder.h> /* GRE PROTOCOL HEADER */ /* GRE Version field */ #define GRE_VERSION_1701 0x0 #define GRE_VERSION_PPTP 0x1 /* GRE Protocol field */ #define GRE_PROTOCOL_PPTP 0x880B /* GRE Flags */ #define GRE_FLAG_C 0x80 #define GRE_FLAG_R 0x40 #define GRE_FLAG_K 0x20 #define GRE_FLAG_S 0x10 #define GRE_FLAG_A 0x80 #define GRE_IS_C(f) ((f)&GRE_FLAG_C) #define GRE_IS_R(f) ((f)&GRE_FLAG_R) #define GRE_IS_K(f) ((f)&GRE_FLAG_K) #define GRE_IS_S(f) ((f)&GRE_FLAG_S) #define GRE_IS_A(f) ((f)&GRE_FLAG_A) /* GRE is a mess: Four different standards */ struct gre_hdr { #if defined(__LITTLE_ENDIAN_BITFIELD) __u16 rec:3, srr:1, seq:1, key:1, routing:1, csum:1, version:3, reserved:4, ack:1; #elif defined(__BIG_ENDIAN_BITFIELD) __u16 csum:1, routing:1, key:1, seq:1, srr:1, rec:3, ack:1, reserved:4, version:3; #else #error "Adjust your <asm/byteorder.h> defines" #endif __u16 protocol; }; /* modified GRE header for PPTP */ struct gre_hdr_pptp { __u8 flags; /* bitfield */ __u8 version; /* should be GRE_VERSION_PPTP */ __u16 protocol; /* should be GRE_PROTOCOL_PPTP */ __u16 payload_len; /* size of ppp payload, not inc. gre header */ __u16 call_id; /* peer's call_id for this session */ __u32 seq; /* sequence number. Present if S==1 */ __u32 ack; /* seq number of highest packet recieved by */ /* sender in this session */ }; /* this is part of ip_conntrack */ struct ip_ct_gre { unsigned int stream_timeout; unsigned int timeout; }; #ifdef __KERNEL__ struct ip_conntrack_expect; struct ip_conntrack; /* structure for original <-> reply keymap */ struct ip_ct_gre_keymap { struct list_head list; struct ip_conntrack_tuple tuple; }; /* add new tuple->key_reply pair to keymap */ int ip_ct_gre_keymap_add(struct ip_conntrack *ct, struct ip_conntrack_tuple *t, int reply); /* delete keymap entries */ void ip_ct_gre_keymap_destroy(struct ip_conntrack *ct); /* get pointer to gre key, if present */ static inline u_int32_t *gre_key(struct gre_hdr *greh) { if (!greh->key) return NULL; if (greh->csum || greh->routing) return (u_int32_t *) (greh+sizeof(*greh)+4); return (u_int32_t *) (greh+sizeof(*greh)); } /* get pointer ot gre csum, if present */ static inline u_int16_t *gre_csum(struct gre_hdr *greh) { if (!greh->csum) return NULL; return (u_int16_t *) (greh+sizeof(*greh)); } #endif /* __KERNEL__ */ #endif /* _CONNTRACK_PROTO_GRE_H */