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 #define TCP_COOKIE_TRANSACTIONS 15 /* TCP Cookie Transactions */ 55 #define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/ 56 #define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */ 57 #define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */ 58 #define TCP_REPAIR 19 /* TCP sock is under repair right now */ 59 #define TCP_REPAIR_QUEUE 20 /* Set TCP queue to repair */ 60 #define TCP_QUEUE_SEQ 21 /* Set sequence number of repaired queue. */ 61 #define TCP_REPAIR_OPTIONS 22 /* Repair TCP connection options */ 62 #define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */ 63 #define TCP_TIMESTAMP 24 /* TCP time stamp */ 64 65 #ifdef __USE_MISC 66 # include <sys/types.h> 67 # include <sys/socket.h> 68 # include <stdint.h> 69 70 typedef uint32_t tcp_seq; 71 /* 72 * TCP header. 73 * Per RFC 793, September, 1981. 74 */ 75 struct tcphdr 76 { 77 __extension__ union 78 { 79 struct 80 { 81 uint16_t th_sport; /* source port */ 82 uint16_t th_dport; /* destination port */ 83 tcp_seq th_seq; /* sequence number */ 84 tcp_seq th_ack; /* acknowledgement number */ 85 # if __BYTE_ORDER == __LITTLE_ENDIAN 86 uint8_t th_x2:4; /* (unused) */ 87 uint8_t th_off:4; /* data offset */ 88 # endif 89 # if __BYTE_ORDER == __BIG_ENDIAN 90 uint8_t th_off:4; /* data offset */ 91 uint8_t th_x2:4; /* (unused) */ 92 # endif 93 uint8_t th_flags; 94 # define TH_FIN 0x01 95 # define TH_SYN 0x02 96 # define TH_RST 0x04 97 # define TH_PUSH 0x08 98 # define TH_ACK 0x10 99 # define TH_URG 0x20 100 uint16_t th_win; /* window */ 101 uint16_t th_sum; /* checksum */ 102 uint16_t th_urp; /* urgent pointer */ 103 }; 104 struct 105 { 106 uint16_t source; 107 uint16_t dest; 108 uint32_t seq; 109 uint32_t ack_seq; 110 # if __BYTE_ORDER == __LITTLE_ENDIAN 111 uint16_t res1:4; 112 uint16_t doff:4; 113 uint16_t fin:1; 114 uint16_t syn:1; 115 uint16_t rst:1; 116 uint16_t psh:1; 117 uint16_t ack:1; 118 uint16_t urg:1; 119 uint16_t res2:2; 120 # elif __BYTE_ORDER == __BIG_ENDIAN 121 uint16_t doff:4; 122 uint16_t res1:4; 123 uint16_t res2:2; 124 uint16_t urg:1; 125 uint16_t ack:1; 126 uint16_t psh:1; 127 uint16_t rst:1; 128 uint16_t syn:1; 129 uint16_t fin:1; 130 # else 131 # error "Adjust your <bits/endian.h> defines" 132 # endif 133 uint16_t window; 134 uint16_t check; 135 uint16_t urg_ptr; 136 }; 137 }; 138 }; 139 140 enum 141 { 142 TCP_ESTABLISHED = 1, 143 TCP_SYN_SENT, 144 TCP_SYN_RECV, 145 TCP_FIN_WAIT1, 146 TCP_FIN_WAIT2, 147 TCP_TIME_WAIT, 148 TCP_CLOSE, 149 TCP_CLOSE_WAIT, 150 TCP_LAST_ACK, 151 TCP_LISTEN, 152 TCP_CLOSING /* now a valid state */ 153 }; 154 155 # define TCPOPT_EOL 0 156 # define TCPOPT_NOP 1 157 # define TCPOPT_MAXSEG 2 158 # define TCPOLEN_MAXSEG 4 159 # define TCPOPT_WINDOW 3 160 # define TCPOLEN_WINDOW 3 161 # define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 162 # define TCPOLEN_SACK_PERMITTED 2 163 # define TCPOPT_SACK 5 /* Experimental */ 164 # define TCPOPT_TIMESTAMP 8 165 # define TCPOLEN_TIMESTAMP 10 166 # define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 167 168 # define TCPOPT_TSTAMP_HDR \ 169 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 170 171 /* 172 * Default maximum segment size for TCP. 173 * With an IP MSS of 576, this is 536, 174 * but 512 is probably more convenient. 175 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). 176 */ 177 # define TCP_MSS 512 178 179 # define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ 180 181 # define TCP_MAX_WINSHIFT 14 /* maximum window shift */ 182 183 # define SOL_TCP 6 /* TCP level */ 184 185 186 # define TCPI_OPT_TIMESTAMPS 1 187 # define TCPI_OPT_SACK 2 188 # define TCPI_OPT_WSCALE 4 189 # define TCPI_OPT_ECN 8 190 191 /* Values for tcpi_state. */ 192 enum tcp_ca_state 193 { 194 TCP_CA_Open = 0, 195 TCP_CA_Disorder = 1, 196 TCP_CA_CWR = 2, 197 TCP_CA_Recovery = 3, 198 TCP_CA_Loss = 4 199 }; 200 201 struct tcp_info 202 { 203 u_int8_t tcpi_state; 204 u_int8_t tcpi_ca_state; 205 u_int8_t tcpi_retransmits; 206 u_int8_t tcpi_probes; 207 u_int8_t tcpi_backoff; 208 u_int8_t tcpi_options; 209 u_int8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; 210 211 u_int32_t tcpi_rto; 212 u_int32_t tcpi_ato; 213 u_int32_t tcpi_snd_mss; 214 u_int32_t tcpi_rcv_mss; 215 216 u_int32_t tcpi_unacked; 217 u_int32_t tcpi_sacked; 218 u_int32_t tcpi_lost; 219 u_int32_t tcpi_retrans; 220 u_int32_t tcpi_fackets; 221 222 /* Times. */ 223 u_int32_t tcpi_last_data_sent; 224 u_int32_t tcpi_last_ack_sent; /* Not remembered, sorry. */ 225 u_int32_t tcpi_last_data_recv; 226 u_int32_t tcpi_last_ack_recv; 227 228 /* Metrics. */ 229 u_int32_t tcpi_pmtu; 230 u_int32_t tcpi_rcv_ssthresh; 231 u_int32_t tcpi_rtt; 232 u_int32_t tcpi_rttvar; 233 u_int32_t tcpi_snd_ssthresh; 234 u_int32_t tcpi_snd_cwnd; 235 u_int32_t tcpi_advmss; 236 u_int32_t tcpi_reordering; 237 238 u_int32_t tcpi_rcv_rtt; 239 u_int32_t tcpi_rcv_space; 240 241 u_int32_t tcpi_total_retrans; 242 }; 243 244 245 /* For TCP_MD5SIG socket option. */ 246 #define TCP_MD5SIG_MAXKEYLEN 80 247 248 struct tcp_md5sig 249 { 250 struct sockaddr_storage tcpm_addr; /* Address associated. */ 251 u_int16_t __tcpm_pad1; /* Zero. */ 252 u_int16_t tcpm_keylen; /* Key length. */ 253 u_int32_t __tcpm_pad2; /* Zero. */ 254 u_int8_t tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* Key (binary). */ 255 }; 256 257 #endif /* Misc. */ 258 259 #endif /* netinet/tcp.h */ 260