projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| b2db9217 | 1 | /* tcp.h 1.21 82/01/18 */ |
| 6e8b2eca | 2 | |
| 8a13b737 | 3 | typedef u_long tcp_seq; |
| 6e8b2eca | 4 | /* |
| eb44bfb2 | 5 | * TCP header. |
| 2b4b57cd | 6 | * Per RFC 793, September, 1981. |
| 6e8b2eca | 7 | */ |
| eb44bfb2 BJ |
8 | struct tcphdr { |
| 9 | u_short th_sport; /* source port */ | |
| 10 | u_short th_dport; /* destination port */ | |
| 8a13b737 BJ |
11 | tcp_seq th_seq; /* sequence number */ |
| 12 | tcp_seq th_ack; /* acknowledgement number */ | |
| 6e8b2eca | 13 | u_char |
| eb44bfb2 BJ |
14 | th_x2:4, /* (unused) */ |
| 15 | th_off:4; /* data offset */ | |
| a3d78bbd | 16 | u_char th_flags; |
| 2ff61f9d BJ |
17 | #define TH_FIN 0x01 |
| 18 | #define TH_SYN 0x02 | |
| 19 | #define TH_RST 0x04 | |
| 20 | #define TH_PUSH 0x08 | |
| 21 | #define TH_ACK 0x10 | |
| 22 | #define TH_URG 0x20 | |
| eb44bfb2 BJ |
23 | u_short th_win; /* window */ |
| 24 | u_short th_sum; /* checksum */ | |
| 25 | u_short th_urp; /* urgent pointer */ | |
| 121f5f3a | 26 | }; |
| 8b5a83bb BJ |
27 | |
| 28 | #define TCPOPT_EOL 0 | |
| 29 | #define TCPOPT_NOP 1 | |
| 30 | #define TCPOPT_MAXSEG 2 | |
| 31 | ||
| 32 | #ifdef TCPTRUEOOB | |
| 33 | /* | |
| 34 | * True out-of-band as value added option. | |
| 35 | * Advertise willingness with TCPOPT_WILOOB in | |
| 36 | * initial segment. If peer is willing, will receive | |
| 37 | * such also. Then can send TCPOPT_OOBDATA whenever oob data | |
| 38 | * exists; peer should ack with TCPOPT_OOBACK in segment. | |
| 39 | */ | |
| 40 | #define TCPOPT_WILLOOB 64 /* bytes: 64, 2 */ | |
| b2db9217 | 41 | #define TCPOPT_OOBDATA 65 /* bytes: 65, 8, seq#, data, markseq */ |
| 8b5a83bb BJ |
42 | #define TCPOPT_OOBACK 66 /* bytes: 66, 3, ack# */ |
| 43 | #endif |