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40 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
41 NetBSD: tcp.h,v 1.28 2007/12/25 18:33:47 perry Exp
43 #ifndef _NETINET_TCP_H_
44 #define _NETINET_TCP_H_
46 #include <sys/featuretest.h>
48 typedef u_int32_t tcp_seq
;
50 /* Flag definitions for tcphdr.th_flags */
63 * Per RFC 793, September, 1981.
64 * Updated by RFC 3168, September, 2001.
67 u_int16_t th_sport
; /* source port */
68 u_int16_t th_dport
; /* destination port */
69 tcp_seq th_seq
; /* sequence number */
70 tcp_seq th_ack
; /* acknowledgement number */
71 #if BYTE_ORDER == LITTLE_ENDIAN
72 /*LINTED non-portable bitfields*/
73 u_int8_t th_x2
:4, /* (unused) */
74 th_off
:4; /* data offset */
76 #if BYTE_ORDER == BIG_ENDIAN
77 /*LINTED non-portable bitfields*/
78 u_int8_t th_off
:4, /* data offset */
79 th_x2
:4; /* (unused) */
82 u_int16_t th_win
; /* window */
83 u_int16_t th_sum
; /* checksum */
84 u_int16_t th_urp
; /* urgent pointer */
90 #define TCPOPT_MAXSEG 2
91 #define TCPOLEN_MAXSEG 4
92 #define TCPOPT_WINDOW 3
93 #define TCPOLEN_WINDOW 3
94 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
95 #define TCPOLEN_SACK_PERMITTED 2
96 #define TCPOPT_SACK 5 /* Experimental */
97 #define TCPOPT_TIMESTAMP 8
98 #define TCPOLEN_TIMESTAMP 10
99 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
101 #define TCPOPT_TSTAMP_HDR \
102 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
104 #define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */
105 #define TCPOLEN_SIGNATURE 18
106 #define TCPOLEN_SIGLEN (TCPOLEN_SIGNATURE+2) /* padding */
108 #define MAX_TCPOPTLEN 40 /* max # bytes that go in options */
110 /* Default maximum segment size for TCP.
111 * This is defined by RFC 1112 Sec 4.2.2.6.
115 #define TCP_MINMSS 216
117 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
119 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
121 #define TCP_MAXBURST 4 /* maximum segments in a burst */
123 /* User-settable options (used with setsockopt). */
124 #define TCP_NODELAY 1 /* don't delay send to coalesce packets */
125 #define TCP_MAXSEG 2 /* set maximum segment size */
126 #define TCP_KEEPIDLE 3
129 #define TCP_NOPUSH 4 /* reserved for FreeBSD compat */
132 #define TCP_KEEPINTVL 5
133 #define TCP_KEEPCNT 6
134 #define TCP_KEEPINIT 7
137 #define TCP_NOOPT 8 /* reserved for FreeBSD compat */
140 #define TCP_MD5SIG 0x10 /* use MD5 digests (RFC2385) */
141 #define TCP_CONGCTL 0x20 /* selected congestion control */
143 #endif /* !_NETINET_TCP_H_ */