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1 /*
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
58 typedef	u_int32_t tcp_seq;
59 /*
60  * TCP header.
61  * Per RFC 793, September, 1981.
62  */
63 struct 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 */
90 struct 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 
125 enum
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.  */
178 enum 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 
187 struct 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 */
232