projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8ae0e4b4 | 1 | /* |
| 0880b18e | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
| 2b6b6284 | 3 | * All rights reserved. |
| 8ae0e4b4 | 4 | * |
| 2b6b6284 KB |
5 | * Redistribution and use in source and binary forms are permitted |
| 6 | * provided that this notice is preserved and that due credit is given | |
| 7 | * to the University of California at Berkeley. The name of the University | |
| 8 | * may not be used to endorse or promote products derived from this | |
| 9 | * software without specific prior written permission. This software | |
| 10 | * is provided ``as is'' without express or implied warranty. | |
| 11 | * | |
| 9d866d2f | 12 | * @(#)tcp.h 7.4.1.1 (Berkeley) %G% |
| 8ae0e4b4 | 13 | */ |
| 9d866d2f MK |
14 | #ifndef BYTE_ORDER |
| 15 | /* | |
| 16 | * Definitions for byte order, | |
| 17 | * according to byte significance from low address to high. | |
| 18 | */ | |
| 19 | #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ | |
| 20 | #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ | |
| 21 | #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ | |
| 22 | ||
| 23 | #ifdef vax | |
| 24 | #define BYTE_ORDER LITTLE_ENDIAN | |
| 25 | #else | |
| 26 | #define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */ | |
| 27 | #endif | |
| 28 | #endif BYTE_ORDER | |
| 6e8b2eca | 29 | |
| 8a13b737 | 30 | typedef u_long tcp_seq; |
| 6e8b2eca | 31 | /* |
| eb44bfb2 | 32 | * TCP header. |
| 2b4b57cd | 33 | * Per RFC 793, September, 1981. |
| 6e8b2eca | 34 | */ |
| eb44bfb2 BJ |
35 | struct tcphdr { |
| 36 | u_short th_sport; /* source port */ | |
| 37 | u_short th_dport; /* destination port */ | |
| 8a13b737 BJ |
38 | tcp_seq th_seq; /* sequence number */ |
| 39 | tcp_seq th_ack; /* acknowledgement number */ | |
| 9d866d2f | 40 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 498aff44 | 41 | u_char th_x2:4, /* (unused) */ |
| eb44bfb2 | 42 | th_off:4; /* data offset */ |
| f112c673 | 43 | #endif |
| 9d866d2f | 44 | #if BYTE_ORDER == BIG_ENDIAN |
| f112c673 MK |
45 | u_char th_off:4, /* data offset */ |
| 46 | th_x2:4; /* (unused) */ | |
| 498aff44 | 47 | #endif |
| a3d78bbd | 48 | u_char th_flags; |
| 2ff61f9d BJ |
49 | #define TH_FIN 0x01 |
| 50 | #define TH_SYN 0x02 | |
| 51 | #define TH_RST 0x04 | |
| 52 | #define TH_PUSH 0x08 | |
| 53 | #define TH_ACK 0x10 | |
| 54 | #define TH_URG 0x20 | |
| eb44bfb2 BJ |
55 | u_short th_win; /* window */ |
| 56 | u_short th_sum; /* checksum */ | |
| 57 | u_short th_urp; /* urgent pointer */ | |
| 121f5f3a | 58 | }; |
| 8b5a83bb BJ |
59 | |
| 60 | #define TCPOPT_EOL 0 | |
| 61 | #define TCPOPT_NOP 1 | |
| 62 | #define TCPOPT_MAXSEG 2 | |
| 0d115dcc MK |
63 | |
| 64 | /* | |
| f8a0cae6 MK |
65 | * Default maximum segment size for TCP. |
| 66 | * With an IP MSS of 576, this is 536, | |
| 67 | * but 512 is probably more convenient. | |
| 0d115dcc | 68 | */ |
| f8a0cae6 MK |
69 | #ifdef lint |
| 70 | #define TCP_MSS 536 | |
| 71 | #else | |
| 9d866d2f MK |
72 | #ifndef IP_MSS |
| 73 | #define IP_MSS 576 | |
| 74 | #endif | |
| 0d115dcc | 75 | #define TCP_MSS MIN(512, IP_MSS - sizeof (struct tcpiphdr)) |
| f8a0cae6 | 76 | #endif |
| 946f1634 MK |
77 | |
| 78 | /* | |
| 79 | * User-settable options (used with setsockopt). | |
| 80 | */ | |
| 81 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ | |
| 82 | #define TCP_MAXSEG 0x02 /* set maximum segment size */ |