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 | * |
| dbf0c423 | 5 | * %sccs.include.redist.c% |
| 2b6b6284 | 6 | * |
| 69d96ae2 | 7 | * @(#)tcp.h 7.8 (Berkeley) %G% |
| 8ae0e4b4 | 8 | */ |
| 9d866d2f MK |
9 | #ifndef BYTE_ORDER |
| 10 | /* | |
| 11 | * Definitions for byte order, | |
| 12 | * according to byte significance from low address to high. | |
| 13 | */ | |
| 14 | #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ | |
| 15 | #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ | |
| 16 | #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ | |
| 17 | ||
| 18 | #ifdef vax | |
| 19 | #define BYTE_ORDER LITTLE_ENDIAN | |
| 20 | #else | |
| 21 | #define BYTE_ORDER BIG_ENDIAN /* mc68000, tahoe, most others */ | |
| 22 | #endif | |
| 23 | #endif BYTE_ORDER | |
| 6e8b2eca | 24 | |
| 8a13b737 | 25 | typedef u_long tcp_seq; |
| 6e8b2eca | 26 | /* |
| eb44bfb2 | 27 | * TCP header. |
| 2b4b57cd | 28 | * Per RFC 793, September, 1981. |
| 6e8b2eca | 29 | */ |
| eb44bfb2 BJ |
30 | struct tcphdr { |
| 31 | u_short th_sport; /* source port */ | |
| 32 | u_short th_dport; /* destination port */ | |
| 8a13b737 BJ |
33 | tcp_seq th_seq; /* sequence number */ |
| 34 | tcp_seq th_ack; /* acknowledgement number */ | |
| 9d866d2f | 35 | #if BYTE_ORDER == LITTLE_ENDIAN |
| 498aff44 | 36 | u_char th_x2:4, /* (unused) */ |
| eb44bfb2 | 37 | th_off:4; /* data offset */ |
| f112c673 | 38 | #endif |
| 9d866d2f | 39 | #if BYTE_ORDER == BIG_ENDIAN |
| f112c673 MK |
40 | u_char th_off:4, /* data offset */ |
| 41 | th_x2:4; /* (unused) */ | |
| 498aff44 | 42 | #endif |
| a3d78bbd | 43 | u_char th_flags; |
| 2ff61f9d BJ |
44 | #define TH_FIN 0x01 |
| 45 | #define TH_SYN 0x02 | |
| 46 | #define TH_RST 0x04 | |
| 47 | #define TH_PUSH 0x08 | |
| 48 | #define TH_ACK 0x10 | |
| 49 | #define TH_URG 0x20 | |
| eb44bfb2 BJ |
50 | u_short th_win; /* window */ |
| 51 | u_short th_sum; /* checksum */ | |
| 52 | u_short th_urp; /* urgent pointer */ | |
| 121f5f3a | 53 | }; |
| 8b5a83bb | 54 | |
| 69d96ae2 AC |
55 | #define TCPOPT_EOL 0 |
| 56 | #define TCPOPT_NOP 1 | |
| 57 | #define TCPOPT_MAXSEG 2 | |
| 58 | #define TCPOLEN_MAXSEG 4 | |
| 59 | #define TCPOPT_WINDOW 3 | |
| 60 | #define TCPOLEN_WINDOW 3 | |
| 61 | #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ | |
| 62 | #define TCPOLEN_SACK_PERMITTED 2 | |
| 63 | #define TCPOPT_SACK 5 /* Experimental */ | |
| 64 | #define TCPOPT_TIMESTAMP 8 | |
| 65 | #define TCPOLEN_TIMESTAMP 10 | |
| 66 | #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ | |
| 67 | ||
| 68 | #define TCPOPT_TSTAMP_HDR \ | |
| 69 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) | |
| 0d115dcc MK |
70 | |
| 71 | /* | |
| f8a0cae6 MK |
72 | * Default maximum segment size for TCP. |
| 73 | * With an IP MSS of 576, this is 536, | |
| 74 | * but 512 is probably more convenient. | |
| a6030a98 | 75 | * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). |
| 0d115dcc | 76 | */ |
| a6030a98 MK |
77 | #define TCP_MSS 512 |
| 78 | ||
| 69d96ae2 AC |
79 | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ |
| 80 | ||
| 81 | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ | |
| 946f1634 MK |
82 | |
| 83 | /* | |
| 84 | * User-settable options (used with setsockopt). | |
| 85 | */ | |
| 86 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ | |
| 87 | #define TCP_MAXSEG 0x02 /* set maximum segment size */ |