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