2 * Copyright (c) 1982, 1986, 1993
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29 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
32 #ifndef _NETINET_TCP_H
33 #define _NETINET_TCP_H 1
38 * User-settable options (used with setsockopt).
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. */
55 # include <sys/types.h>
58 typedef u_int32_t tcp_seq;
61 * Per RFC 793, September, 1981.
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 */
73 # if __BYTE_ORDER == __BIG_ENDIAN
74 u_int8_t th_off:4; /* data offset */
75 u_int8_t th_x2:4; /* (unused) */
84 u_int16_t th_win; /* window */
85 u_int16_t th_sum; /* checksum */
86 u_int16_t th_urp; /* urgent pointer */
89 # else /* !__FAVOR_BSD */
96 # if __BYTE_ORDER == __LITTLE_ENDIAN
106 # elif __BYTE_ORDER == __BIG_ENDIAN
117 # error "Adjust your <bits/endian.h> defines"
123 # endif /* __FAVOR_BSD */
137 TCP_CLOSING /* now a valid state */
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 */
153 # define TCPOPT_TSTAMP_HDR \
154 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
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)).
164 # define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
166 # define TCP_MAX_WINSHIFT 14 /* maximum window shift */
168 # define SOL_TCP 6 /* TCP level */
171 # define TCPI_OPT_TIMESTAMPS 1
172 # define TCPI_OPT_SACK 2
173 # define TCPI_OPT_WSCALE 4
174 # define TCPI_OPT_ECN 8
176 /* Values for tcpi_state. */
189 u_int8_t tcpi_ca_state;
190 u_int8_t tcpi_retransmits;
191 u_int8_t tcpi_probes;
192 u_int8_t tcpi_backoff;
193 u_int8_t tcpi_options;
194 u_int8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
198 u_int32_t tcpi_snd_mss;
199 u_int32_t tcpi_rcv_mss;
201 u_int32_t tcpi_unacked;
202 u_int32_t tcpi_sacked;
204 u_int32_t tcpi_retrans;
205 u_int32_t tcpi_fackets;
208 u_int32_t tcpi_last_data_sent;
209 u_int32_t tcpi_last_ack_sent; /* Not remembered, sorry. */
210 u_int32_t tcpi_last_data_recv;
211 u_int32_t tcpi_last_ack_recv;
215 u_int32_t tcpi_rcv_ssthresh;
217 u_int32_t tcpi_rttvar;
218 u_int32_t tcpi_snd_ssthresh;
219 u_int32_t tcpi_snd_cwnd;
220 u_int32_t tcpi_advmss;
221 u_int32_t tcpi_reordering;
222 u_int32_t tcpi_rcv_rtt;
223 u_int32_t tcpi_rcv_space;
224 u_int32_t tcpi_total_retrans;
230 #endif /* netinet/tcp.h */