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 64 #ifdef __USE_MISC 65 # include <sys/types.h> 66 # include <sys/socket.h> 67 68 # ifdef __FAVOR_BSD 69 typedef u_int32_t tcp_seq; 70 /* 71 * TCP header. 72 * Per RFC 793, September, 1981. 73 */ 74 struct tcphdr 75 { 76 u_int16_t th_sport; /* source port */ 77 u_int16_t th_dport; /* destination port */ 78 tcp_seq th_seq; /* sequence number */ 79 tcp_seq th_ack; /* acknowledgement number */ 80 # if __BYTE_ORDER == __LITTLE_ENDIAN 81 u_int8_t th_x2:4; /* (unused) */ 82 u_int8_t th_off:4; /* data offset */ 83 # endif 84 # if __BYTE_ORDER == __BIG_ENDIAN 85 u_int8_t th_off:4; /* data offset */ 86 u_int8_t th_x2:4; /* (unused) */ 87 # endif 88 u_int8_t th_flags; 89 # define TH_FIN 0x01 90 # define TH_SYN 0x02 91 # define TH_RST 0x04 92 # define TH_PUSH 0x08 93 # define TH_ACK 0x10 94 # define TH_URG 0x20 95 u_int16_t th_win; /* window */ 96 u_int16_t th_sum; /* checksum */ 97 u_int16_t th_urp; /* urgent pointer */ 98 }; 99 100 # else /* !__FAVOR_BSD */ 101 struct tcphdr 102 { 103 u_int16_t source; 104 u_int16_t dest; 105 u_int32_t seq; 106 u_int32_t ack_seq; 107 # if __BYTE_ORDER == __LITTLE_ENDIAN 108 u_int16_t res1:4; 109 u_int16_t doff:4; 110 u_int16_t fin:1; 111 u_int16_t syn:1; 112 u_int16_t rst:1; 113 u_int16_t psh:1; 114 u_int16_t ack:1; 115 u_int16_t urg:1; 116 u_int16_t res2:2; 117 # elif __BYTE_ORDER == __BIG_ENDIAN 118 u_int16_t doff:4; 119 u_int16_t res1:4; 120 u_int16_t res2:2; 121 u_int16_t urg:1; 122 u_int16_t ack:1; 123 u_int16_t psh:1; 124 u_int16_t rst:1; 125 u_int16_t syn:1; 126 u_int16_t fin:1; 127 # else 128 # error "Adjust your <bits/endian.h> defines" 129 # endif 130 u_int16_t window; 131 u_int16_t check; 132 u_int16_t urg_ptr; 133 }; 134 # endif /* __FAVOR_BSD */ 135 136 enum 137 { 138 TCP_ESTABLISHED = 1, 139 TCP_SYN_SENT, 140 TCP_SYN_RECV, 141 TCP_FIN_WAIT1, 142 TCP_FIN_WAIT2, 143 TCP_TIME_WAIT, 144 TCP_CLOSE, 145 TCP_CLOSE_WAIT, 146 TCP_LAST_ACK, 147 TCP_LISTEN, 148 TCP_CLOSING /* now a valid state */ 149 }; 150 151 # define TCPOPT_EOL 0 152 # define TCPOPT_NOP 1 153 # define TCPOPT_MAXSEG 2 154 # define TCPOLEN_MAXSEG 4 155 # define TCPOPT_WINDOW 3 156 # define TCPOLEN_WINDOW 3 157 # define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 158 # define TCPOLEN_SACK_PERMITTED 2 159 # define TCPOPT_SACK 5 /* Experimental */ 160 # define TCPOPT_TIMESTAMP 8 161 # define TCPOLEN_TIMESTAMP 10 162 # define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 163 164 # define TCPOPT_TSTAMP_HDR \ 165 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 166 167 /* 168 * Default maximum segment size for TCP. 169 * With an IP MSS of 576, this is 536, 170 * but 512 is probably more convenient. 171 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). 172 */ 173 # define TCP_MSS 512 174 175 # define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ 176 177 # define TCP_MAX_WINSHIFT 14 /* maximum window shift */ 178 179 # define SOL_TCP 6 /* TCP level */ 180 181 182 # define TCPI_OPT_TIMESTAMPS 1 183 # define TCPI_OPT_SACK 2 184 # define TCPI_OPT_WSCALE 4 185 # define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */ 186 # define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */ 187 # define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */ 188 189 /* Values for tcpi_state. */ 190 enum tcp_ca_state 191 { 192 TCP_CA_Open = 0, 193 TCP_CA_Disorder = 1, 194 TCP_CA_CWR = 2, 195 TCP_CA_Recovery = 3, 196 TCP_CA_Loss = 4 197 }; 198 199 struct tcp_info 200 { 201 u_int8_t tcpi_state; 202 u_int8_t tcpi_ca_state; 203 u_int8_t tcpi_retransmits; 204 u_int8_t tcpi_probes; 205 u_int8_t tcpi_backoff; 206 u_int8_t tcpi_options; 207 u_int8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4; 208 209 u_int32_t tcpi_rto; 210 u_int32_t tcpi_ato; 211 u_int32_t tcpi_snd_mss; 212 u_int32_t tcpi_rcv_mss; 213 214 u_int32_t tcpi_unacked; 215 u_int32_t tcpi_sacked; 216 u_int32_t tcpi_lost; 217 u_int32_t tcpi_retrans; 218 u_int32_t tcpi_fackets; 219 220 /* Times. */ 221 u_int32_t tcpi_last_data_sent; 222 u_int32_t tcpi_last_ack_sent; /* Not remembered, sorry. */ 223 u_int32_t tcpi_last_data_recv; 224 u_int32_t tcpi_last_ack_recv; 225 226 /* Metrics. */ 227 u_int32_t tcpi_pmtu; 228 u_int32_t tcpi_rcv_ssthresh; 229 u_int32_t tcpi_rtt; 230 u_int32_t tcpi_rttvar; 231 u_int32_t tcpi_snd_ssthresh; 232 u_int32_t tcpi_snd_cwnd; 233 u_int32_t tcpi_advmss; 234 u_int32_t tcpi_reordering; 235 236 u_int32_t tcpi_rcv_rtt; 237 u_int32_t tcpi_rcv_space; 238 239 u_int32_t tcpi_total_retrans; 240 }; 241 242 243 /* For TCP_MD5SIG socket option. */ 244 #define TCP_MD5SIG_MAXKEYLEN 80 245 246 struct tcp_md5sig 247 { 248 struct sockaddr_storage tcpm_addr; /* Address associated. */ 249 u_int16_t __tcpm_pad1; /* Zero. */ 250 u_int16_t tcpm_keylen; /* Key length. */ 251 u_int32_t __tcpm_pad2; /* Zero. */ 252 u_int8_t tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* Key (binary). */ 253 }; 254 255 /* For socket repair options. */ 256 struct tcp_repair_opt 257 { 258 u_int32_t opt_code; 259 u_int32_t opt_val; 260 }; 261 262 /* Queue to repair, for TCP_REPAIR_QUEUE. */ 263 enum 264 { 265 TCP_NO_QUEUE, 266 TCP_RECV_QUEUE, 267 TCP_SEND_QUEUE, 268 TCP_QUEUES_NR, 269 }; 270 271 /* For cookie transactions socket options. */ 272 #define TCP_COOKIE_MIN 8 /* 64-bits */ 273 #define TCP_COOKIE_MAX 16 /* 128-bits */ 274 #define TCP_COOKIE_PAIR_SIZE (2*TCP_COOKIE_MAX) 275 276 /* Flags for both getsockopt and setsockopt */ 277 #define TCP_COOKIE_IN_ALWAYS (1 << 0) /* Discard SYN without cookie */ 278 #define TCP_COOKIE_OUT_NEVER (1 << 1) /* Prohibit outgoing cookies, 279 * supercedes everything. */ 280 281 /* Flags for getsockopt */ 282 #define TCP_S_DATA_IN (1 << 2) /* Was data received? */ 283 #define TCP_S_DATA_OUT (1 << 3) /* Was data sent? */ 284 285 #define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */ 286 #define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */ 287 288 struct tcp_cookie_transactions 289 { 290 u_int16_t tcpct_flags; 291 u_int8_t __tcpct_pad1; 292 u_int8_t tcpct_cookie_desired; 293 u_int16_t tcpct_s_data_desired; 294 u_int16_t tcpct_used; 295 u_int8_t tcpct_value[TCP_MSS_DEFAULT]; 296 }; 297 298 #endif /* Misc. */ 299 300 #endif /* netinet/tcp.h */ 301