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1 #ifndef _CONNTRACK_PROTO_GRE_H |
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2 #define _CONNTRACK_PROTO_GRE_H |
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3 #include <asm/byteorder.h> |
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4 |
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5 /* GRE PROTOCOL HEADER */ |
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6 |
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7 /* GRE Version field */ |
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8 #define GRE_VERSION_1701 0x0 |
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9 #define GRE_VERSION_PPTP 0x1 |
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10 |
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11 /* GRE Protocol field */ |
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12 #define GRE_PROTOCOL_PPTP 0x880B |
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13 |
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14 /* GRE Flags */ |
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15 #define GRE_FLAG_C 0x80 |
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16 #define GRE_FLAG_R 0x40 |
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17 #define GRE_FLAG_K 0x20 |
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18 #define GRE_FLAG_S 0x10 |
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19 #define GRE_FLAG_A 0x80 |
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20 |
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21 #define GRE_IS_C(f) ((f)&GRE_FLAG_C) |
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22 #define GRE_IS_R(f) ((f)&GRE_FLAG_R) |
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23 #define GRE_IS_K(f) ((f)&GRE_FLAG_K) |
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24 #define GRE_IS_S(f) ((f)&GRE_FLAG_S) |
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25 #define GRE_IS_A(f) ((f)&GRE_FLAG_A) |
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26 |
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27 /* GRE is a mess: Four different standards */ |
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28 struct gre_hdr { |
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29 #if defined(__LITTLE_ENDIAN_BITFIELD) |
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30 __u16 rec:3, |
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31 srr:1, |
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32 seq:1, |
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33 key:1, |
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34 routing:1, |
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35 csum:1, |
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36 version:3, |
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37 reserved:4, |
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38 ack:1; |
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39 #elif defined(__BIG_ENDIAN_BITFIELD) |
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40 __u16 csum:1, |
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41 routing:1, |
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42 key:1, |
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43 seq:1, |
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44 srr:1, |
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45 rec:3, |
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46 ack:1, |
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47 reserved:4, |
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48 version:3; |
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49 #else |
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50 #error "Adjust your <asm/byteorder.h> defines" |
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51 #endif |
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52 __be16 protocol; |
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53 }; |
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54 |
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55 /* modified GRE header for PPTP */ |
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56 struct gre_hdr_pptp { |
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57 __u8 flags; /* bitfield */ |
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58 __u8 version; /* should be GRE_VERSION_PPTP */ |
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59 __be16 protocol; /* should be GRE_PROTOCOL_PPTP */ |
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60 __be16 payload_len; /* size of ppp payload, not inc. gre header */ |
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61 __be16 call_id; /* peer's call_id for this session */ |
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62 __be32 seq; /* sequence number. Present if S==1 */ |
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63 __be32 ack; /* seq number of highest packet recieved by */ |
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64 /* sender in this session */ |
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65 }; |
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66 |
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67 struct nf_ct_gre { |
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68 unsigned int stream_timeout; |
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69 unsigned int timeout; |
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70 }; |
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71 |
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72 #ifdef __KERNEL__ |
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73 #include <net/netfilter/nf_conntrack_tuple.h> |
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74 |
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75 struct nf_conn; |
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76 |
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77 /* structure for original <-> reply keymap */ |
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78 struct nf_ct_gre_keymap { |
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79 struct list_head list; |
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80 struct nf_conntrack_tuple tuple; |
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81 }; |
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82 |
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83 /* add new tuple->key_reply pair to keymap */ |
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84 int nf_ct_gre_keymap_add(struct nf_conn *ct, enum ip_conntrack_dir dir, |
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85 struct nf_conntrack_tuple *t); |
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86 |
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87 /* delete keymap entries */ |
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88 void nf_ct_gre_keymap_destroy(struct nf_conn *ct); |
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89 |
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90 extern void nf_ct_gre_keymap_flush(struct net *net); |
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91 extern void nf_nat_need_gre(void); |
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92 |
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93 #endif /* __KERNEL__ */ |
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94 #endif /* _CONNTRACK_PROTO_GRE_H */ |