projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 53a5409e | 1 | /* tcp.h 1.15 81/11/14 */ |
| 6e8b2eca BJ |
2 | |
| 3 | /* | |
| dad64fdf BJ |
4 | * Tcp header. Fits over the ip header after option removed. |
| 5 | * | |
| 6 | * SHOULD MAKE A CLEAN HEADER FOR USE BY USERS. | |
| 6e8b2eca | 7 | */ |
| 53a5409e BJ |
8 | struct tcpiphdr { |
| 9 | struct tcpiphdr *t_next; /* -> next tcp on rcv chain */ | |
| 10 | struct tcpiphdr *t_prev; /* -> prev tcp on rcv chain */ | |
| 6e8b2eca BJ |
11 | u_char t_x1; /* (unused) */ |
| 12 | u_char t_pr; /* protocol */ | |
| 94b52709 BJ |
13 | /* by rights, t_len should be a u_short, but this makes operations */ |
| 14 | /* on it very dangerous as comparisons become unsigned and comparing */ | |
| 15 | /* against negative numbers then fails... we don't expect any > 32767 */ | |
| 16 | /* byte segments, so pragmatically delcare it to be a short */ | |
| 17 | short t_len; /* seg length */ | |
| d52566dd BJ |
18 | struct ip_addr t_s; /* source internet address */ |
| 19 | struct ip_addr t_d; /* destination internet address */ | |
| 6e8b2eca BJ |
20 | u_short t_src; /* source port */ |
| 21 | u_short t_dst; /* destination port */ | |
| 22 | seq_t t_seq; /* sequence number */ | |
| 23 | seq_t t_ackno; /* acknowledgement number */ | |
| 24 | #define t_end(x) (x->t_seq + x->t_len - 1) | |
| 25 | u_char | |
| 26 | t_x2:4, /* (unused) */ | |
| 27 | t_off:4; /* data offset */ | |
| a3d78bbd BJ |
28 | u_char th_flags; |
| 29 | #define TH_FIN 001 | |
| 30 | #define TH_SYN 002 | |
| 31 | #define TH_RST 004 | |
| 32 | #define TH_EOL 010 | |
| 33 | #define TH_ACK 020 | |
| 34 | #define TH_URG 040 | |
| 6e8b2eca BJ |
35 | u_short t_win; /* window */ |
| 36 | u_short t_sum; /* checksum */ | |
| 37 | u_short t_urp; /* urgent pointer */ | |
| 121f5f3a | 38 | }; |