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lh9ed821d2023-04-07 01:36:19 -07001/*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
30 */
31
32#ifndef _NETINET_TCP_H
33#define _NETINET_TCP_H 1
34
35#include <features.h>
36
37/*
38 * User-settable options (used with setsockopt).
39 */
40#define TCP_NODELAY 1 /* Don't delay send to coalesce packets */
41#define TCP_MAXSEG 2 /* Set maximum segment size */
42#define TCP_CORK 3 /* Control sending of partial frames */
43#define TCP_KEEPIDLE 4 /* Start keeplives after this period */
44#define TCP_KEEPINTVL 5 /* Interval between keepalives */
45#define TCP_KEEPCNT 6 /* Number of keepalives before death */
46#define TCP_SYNCNT 7 /* Number of SYN retransmits */
47#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */
48#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */
49#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */
50#define TCP_INFO 11 /* Information about this connection. */
51#define TCP_QUICKACK 12 /* Bock/reenable quick ACKs. */
52#define TCP_CONGESTION 13 /* Congestion control algorithm. */
53
54#ifdef __USE_MISC
55# include <sys/types.h>
56
57# ifdef __FAVOR_BSD
58typedef u_int32_t tcp_seq;
59/*
60 * TCP header.
61 * Per RFC 793, September, 1981.
62 */
63struct tcphdr
64 {
65 u_int16_t th_sport; /* source port */
66 u_int16_t th_dport; /* destination port */
67 tcp_seq th_seq; /* sequence number */
68 tcp_seq th_ack; /* acknowledgement number */
69# if __BYTE_ORDER == __LITTLE_ENDIAN
70 u_int8_t th_x2:4; /* (unused) */
71 u_int8_t th_off:4; /* data offset */
72# endif
73# if __BYTE_ORDER == __BIG_ENDIAN
74 u_int8_t th_off:4; /* data offset */
75 u_int8_t th_x2:4; /* (unused) */
76# endif
77 u_int8_t th_flags;
78# define TH_FIN 0x01
79# define TH_SYN 0x02
80# define TH_RST 0x04
81# define TH_PUSH 0x08
82# define TH_ACK 0x10
83# define TH_URG 0x20
84 u_int16_t th_win; /* window */
85 u_int16_t th_sum; /* checksum */
86 u_int16_t th_urp; /* urgent pointer */
87};
88
89# else /* !__FAVOR_BSD */
90struct tcphdr
91 {
92 u_int16_t source;
93 u_int16_t dest;
94 u_int32_t seq;
95 u_int32_t ack_seq;
96# if __BYTE_ORDER == __LITTLE_ENDIAN
97 u_int16_t res1:4;
98 u_int16_t doff:4;
99 u_int16_t fin:1;
100 u_int16_t syn:1;
101 u_int16_t rst:1;
102 u_int16_t psh:1;
103 u_int16_t ack:1;
104 u_int16_t urg:1;
105 u_int16_t res2:2;
106# elif __BYTE_ORDER == __BIG_ENDIAN
107 u_int16_t doff:4;
108 u_int16_t res1:4;
109 u_int16_t res2:2;
110 u_int16_t urg:1;
111 u_int16_t ack:1;
112 u_int16_t psh:1;
113 u_int16_t rst:1;
114 u_int16_t syn:1;
115 u_int16_t fin:1;
116# else
117# error "Adjust your <bits/endian.h> defines"
118# endif
119 u_int16_t window;
120 u_int16_t check;
121 u_int16_t urg_ptr;
122};
123# endif /* __FAVOR_BSD */
124
125enum
126{
127 TCP_ESTABLISHED = 1,
128 TCP_SYN_SENT,
129 TCP_SYN_RECV,
130 TCP_FIN_WAIT1,
131 TCP_FIN_WAIT2,
132 TCP_TIME_WAIT,
133 TCP_CLOSE,
134 TCP_CLOSE_WAIT,
135 TCP_LAST_ACK,
136 TCP_LISTEN,
137 TCP_CLOSING /* now a valid state */
138};
139
140# define TCPOPT_EOL 0
141# define TCPOPT_NOP 1
142# define TCPOPT_MAXSEG 2
143# define TCPOLEN_MAXSEG 4
144# define TCPOPT_WINDOW 3
145# define TCPOLEN_WINDOW 3
146# define TCPOPT_SACK_PERMITTED 4 /* Experimental */
147# define TCPOLEN_SACK_PERMITTED 2
148# define TCPOPT_SACK 5 /* Experimental */
149# define TCPOPT_TIMESTAMP 8
150# define TCPOLEN_TIMESTAMP 10
151# define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
152
153# define TCPOPT_TSTAMP_HDR \
154 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
155
156/*
157 * Default maximum segment size for TCP.
158 * With an IP MSS of 576, this is 536,
159 * but 512 is probably more convenient.
160 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
161 */
162# define TCP_MSS 512
163
164# define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
165
166# define TCP_MAX_WINSHIFT 14 /* maximum window shift */
167
168# define SOL_TCP 6 /* TCP level */
169
170
171# define TCPI_OPT_TIMESTAMPS 1
172# define TCPI_OPT_SACK 2
173# define TCPI_OPT_WSCALE 4
174# define TCPI_OPT_ECN 8
175# define TCPI_OPT_ECN_SEEN 16
176
177/* Values for tcpi_state. */
178enum tcp_ca_state
179{
180 TCP_CA_Open = 0,
181 TCP_CA_Disorder = 1,
182 TCP_CA_CWR = 2,
183 TCP_CA_Recovery = 3,
184 TCP_CA_Loss = 4
185};
186
187struct tcp_info
188{
189 u_int8_t tcpi_state;
190 u_int8_t tcpi_ca_state;
191 u_int8_t tcpi_retransmits;
192 u_int8_t tcpi_probes;
193 u_int8_t tcpi_backoff;
194 u_int8_t tcpi_options;
195 u_int8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
196
197 u_int32_t tcpi_rto;
198 u_int32_t tcpi_ato;
199 u_int32_t tcpi_snd_mss;
200 u_int32_t tcpi_rcv_mss;
201
202 u_int32_t tcpi_unacked;
203 u_int32_t tcpi_sacked;
204 u_int32_t tcpi_lost;
205 u_int32_t tcpi_retrans;
206 u_int32_t tcpi_fackets;
207
208 /* Times. */
209 u_int32_t tcpi_last_data_sent;
210 u_int32_t tcpi_last_ack_sent; /* Not remembered, sorry. */
211 u_int32_t tcpi_last_data_recv;
212 u_int32_t tcpi_last_ack_recv;
213
214 /* Metrics. */
215 u_int32_t tcpi_pmtu;
216 u_int32_t tcpi_rcv_ssthresh;
217 u_int32_t tcpi_rtt;
218 u_int32_t tcpi_rttvar;
219 u_int32_t tcpi_snd_ssthresh;
220 u_int32_t tcpi_snd_cwnd;
221 u_int32_t tcpi_advmss;
222 u_int32_t tcpi_reordering;
223 u_int32_t tcpi_rcv_rtt;
224 u_int32_t tcpi_rcv_space;
225 u_int32_t tcpi_total_retrans;
226
227};
228
229#endif /* Misc. */
230
231#endif /* netinet/tcp.h */