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 #define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */ 54 55 #ifdef __USE_MISC 56 # include <sys/types.h> 57 # include <sys/socket.h> 58 59 # ifdef __FAVOR_BSD 60 typedef u_int32_t tcp_seq; 61 /* 62 * TCP header. 63 * Per RFC 793, September, 1981. 64 */ 65 struct tcphdr 66 { 67 u_int16_t th_sport; /* source port */ 68 u_int16_t th_dport; /* destination port */ 69 tcp_seq th_seq; /* sequence number */ 70 tcp_seq th_ack; /* acknowledgement number */ 71 # if __BYTE_ORDER == __LITTLE_ENDIAN 72 u_int8_t th_x2:4; /* (unused) */ 73 u_int8_t th_off:4; /* data offset */ 74 # endif 75 # if __BYTE_ORDER == __BIG_ENDIAN 76 u_int8_t th_off:4; /* data offset */ 77 u_int8_t th_x2:4; /* (unused) */ 78 # endif 79 u_int8_t th_flags; 80 # define TH_FIN 0x01 81 # define TH_SYN 0x02 82 # define TH_RST 0x04 83 # define TH_PUSH 0x08 84 # define TH_ACK 0x10 85 # define TH_URG 0x20 86 u_int16_t th_win; /* window */ 87 u_int16_t th_sum; /* checksum */ 88 u_int16_t th_urp; /* urgent pointer */ 89 }; 90 91 # else /* !__FAVOR_BSD */ 92 struct tcphdr 93 { 94 u_int16_t source; 95 u_int16_t dest; 96 u_int32_t seq; 97 u_int32_t ack_seq; 98 # if __BYTE_ORDER == __LITTLE_ENDIAN 99 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