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001: /*
002:  * Copyright (c) 1982, 1986, 1993
003:  *      The Regents of the University of California.  All rights reserved.
004:  *
005:  * Redistribution and use in source and binary forms, with or without
006:  * modification, are permitted provided that the following conditions
007:  * are met:
008:  * 1. Redistributions of source code must retain the above copyright
009:  *    notice, this list of conditions and the following disclaimer.
010:  * 2. Redistributions in binary form must reproduce the above copyright
011:  *    notice, this list of conditions and the following disclaimer in the
012:  *    documentation and/or other materials provided with the distribution.
013:  * 4. Neither the name of the University nor the names of its contributors
014:  *    may be used to endorse or promote products derived from this software
015:  *    without specific prior written permission.
016:  *
017:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
018:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
019:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
020:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
021:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
022:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
023:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
024:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
025:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
026:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
027:  * SUCH DAMAGE.
028:  *
029:  *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
030:  */
031: 
032: #ifndef _NETINET_TCP_H
033: #define _NETINET_TCP_H  1
034: 
035: #include <features.h>
036: 
037: /*
038:  * User-settable options (used with setsockopt).
039:  */
040: #define TCP_NODELAY      1      /* Don't delay send to coalesce packets  */
041: #define TCP_MAXSEG       2      /* Set maximum segment size  */
042: #define TCP_CORK         3      /* Control sending of partial frames  */
043: #define TCP_KEEPIDLE     4      /* Start keeplives after this period */
044: #define TCP_KEEPINTVL    5      /* Interval between keepalives */
045: #define TCP_KEEPCNT      6      /* Number of keepalives before death */
046: #define TCP_SYNCNT       7      /* Number of SYN retransmits */
047: #define TCP_LINGER2      8      /* Life time of orphaned FIN-WAIT-2 state */
048: #define TCP_DEFER_ACCEPT 9      /* Wake up listener only when data arrive */
049: #define TCP_WINDOW_CLAMP 10     /* Bound advertised window */
050: #define TCP_INFO         11     /* Information about this connection. */
051: #define TCP_QUICKACK     12     /* Bock/reenable quick ACKs.  */
052: #define TCP_CONGESTION   13     /* Congestion control algorithm.  */
053: #define TCP_MD5SIG       14     /* TCP MD5 Signature (RFC2385) */
054: 
055: #ifdef __USE_MISC
056: # include <sys/types.h>
057: # include <sys/socket.h>
058: 
059: # ifdef __FAVOR_BSD
060: typedef u_int32_t tcp_seq;
061: /*
062:  * TCP header.
063:  * Per RFC 793, September, 1981.
064:  */
065: struct tcphdr
066:   {
067:     u_int16_t th_sport;         /* source port */
068:     u_int16_t th_dport;         /* destination port */
069:     tcp_seq th_seq;             /* sequence number */
070:     tcp_seq th_ack;             /* acknowledgement number */
071: #  if __BYTE_ORDER == __LITTLE_ENDIAN
072:     u_int8_t th_x2:4;           /* (unused) */
073:     u_int8_t th_off:4;          /* data offset */
074: #  endif
075: #  if __BYTE_ORDER == __BIG_ENDIAN
076:     u_int8_t th_off:4;          /* data offset */
077:     u_int8_t th_x2:4;           /* (unused) */
078: #  endif
079:     u_int8_t th_flags;
080: #  define TH_FIN        0x01
081: #  define TH_SYN        0x02
082: #  define TH_RST        0x04
083: #  define TH_PUSH       0x08
084: #  define TH_ACK        0x10
085: #  define TH_URG        0x20
086:     u_int16_t th_win;           /* window */
087:     u_int16_t th_sum;           /* checksum */
088:     u_int16_t th_urp;           /* urgent pointer */
089: };
090: 
091: # else /* !__FAVOR_BSD */
092: struct tcphdr
093:   {
094:     u_int16_t source;
095:     u_int16_t dest;
096:     u_int32_t seq;
097:     u_int32_t ack_seq;
098: #  if __BYTE_ORDER == __LITTLE_ENDIAN
099:     u_int16_t res1:4;
100:     u_int16_t doff:4;
101:     u_int16_t fin:1;
102:     u_int16_t syn:1;
103:     u_int16_t rst:1;
104:     u_int16_t psh:1;
105:     u_int16_t ack:1;
106:     u_int16_t urg:1;
107:     u_int16_t res2:2;
108: #  elif __BYTE_ORDER == __BIG_ENDIAN
109:     u_int16_t doff:4;
110:     u_int16_t res1:4;
111:     u_int16_t res2:2;
112:     u_int16_t urg:1;
113:     u_int16_t ack:1;
114:     u_int16_t psh:1;
115:     u_int16_t rst:1;
116:     u_int16_t syn:1;
117:     u_int16_t fin:1;
118: #  else
119: #   error "Adjust your <bits/endian.h> defines"
120: #  endif
121:     u_int16_t window;
122:     u_int16_t check;
123:     u_int16_t urg_ptr;
124: };
125: # endif /* __FAVOR_BSD */
126: 
127: enum
128: {
129:   TCP_ESTABLISHED = 1,
130:   TCP_SYN_SENT,
131:   TCP_SYN_RECV,
132:   TCP_FIN_WAIT1,
133:   TCP_FIN_WAIT2,
134:   TCP_TIME_WAIT,
135:   TCP_CLOSE,
136:   TCP_CLOSE_WAIT,
137:   TCP_LAST_ACK,
138:   TCP_LISTEN,
139:   TCP_CLOSING   /* now a valid state */
140: };
141: 
142: # define TCPOPT_EOL             0
143: # define TCPOPT_NOP             1
144: # define TCPOPT_MAXSEG          2
145: # define TCPOLEN_MAXSEG         4
146: # define TCPOPT_WINDOW          3
147: # define TCPOLEN_WINDOW         3
148: # define TCPOPT_SACK_PERMITTED  4               /* Experimental */
149: # define TCPOLEN_SACK_PERMITTED 2
150: # define TCPOPT_SACK            5               /* Experimental */
151: # define TCPOPT_TIMESTAMP       8
152: # define TCPOLEN_TIMESTAMP      10
153: # define TCPOLEN_TSTAMP_APPA    (TCPOLEN_TIMESTAMP+2) /* appendix A */
154: 
155: # define TCPOPT_TSTAMP_HDR      \
156:     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
157: 
158: /*
159:  * Default maximum segment size for TCP.
160:  * With an IP MSS of 576, this is 536,
161:  * but 512 is probably more convenient.
162:  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
163:  */
164: # define TCP_MSS        512
165: 
166: # define TCP_MAXWIN     65535   /* largest value for (unscaled) window */
167: 
168: # define TCP_MAX_WINSHIFT       14      /* maximum window shift */
169: 
170: # define SOL_TCP                6       /* TCP level */
171: 
172: 
173: # define TCPI_OPT_TIMESTAMPS    1
174: # define TCPI_OPT_SACK          2
175: # define TCPI_OPT_WSCALE        4
176: # define TCPI_OPT_ECN           8
177: 
178: /* Values for tcpi_state.  */
179: enum tcp_ca_state
180: {
181:   TCP_CA_Open = 0,
182:   TCP_CA_Disorder = 1,
183:   TCP_CA_CWR = 2,
184:   TCP_CA_Recovery = 3,
185:   TCP_CA_Loss = 4
186: };
187: 
188: struct tcp_info
189: {
190:   u_int8_t      tcpi_state;
191:   u_int8_t      tcpi_ca_state;
192:   u_int8_t      tcpi_retransmits;
193:   u_int8_t      tcpi_probes;
194:   u_int8_t      tcpi_backoff;
195:   u_int8_t      tcpi_options;
196:   u_int8_t      tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
197: 
198:   u_int32_t     tcpi_rto;
199:   u_int32_t     tcpi_ato;
200:   u_int32_t     tcpi_snd_mss;
201:   u_int32_t     tcpi_rcv_mss;
202: 
203:   u_int32_t     tcpi_unacked;
204:   u_int32_t     tcpi_sacked;
205:   u_int32_t     tcpi_lost;
206:   u_int32_t     tcpi_retrans;
207:   u_int32_t     tcpi_fackets;
208: 
209:   /* Times. */
210:   u_int32_t     tcpi_last_data_sent;
211:   u_int32_t     tcpi_last_ack_sent;     /* Not remembered, sorry.  */
212:   u_int32_t     tcpi_last_data_recv;
213:   u_int32_t     tcpi_last_ack_recv;
214: 
215:   /* Metrics. */
216:   u_int32_t     tcpi_pmtu;
217:   u_int32_t     tcpi_rcv_ssthresh;
218:   u_int32_t     tcpi_rtt;
219:   u_int32_t     tcpi_rttvar;
220:   u_int32_t     tcpi_snd_ssthresh;
221:   u_int32_t     tcpi_snd_cwnd;
222:   u_int32_t     tcpi_advmss;
223:   u_int32_t     tcpi_reordering;
224: 
225:   u_int32_t     tcpi_rcv_rtt;
226:   u_int32_t     tcpi_rcv_space;
227: 
228:   u_int32_t     tcpi_total_retrans;
229: };
230: 
231: 
232: /* For TCP_MD5SIG socket option.  */
233: #define TCP_MD5SIG_MAXKEYLEN    80
234: 
235: struct tcp_md5sig
236: {
237:   struct sockaddr_storage tcpm_addr;            /* Address associated.  */
238:   u_int16_t     __tcpm_pad1;                    /* Zero.  */
239:   u_int16_t     tcpm_keylen;                    /* Key length.  */
240:   u_int32_t     __tcpm_pad2;                    /* Zero.  */
241:   u_int8_t      tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* Key (binary).  */
242: };
243: 
244: #endif /* Misc.  */
245: 
246: #endif /* netinet/tcp.h */
247: 

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