1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)tcp.h 8.1 (Berkeley) 6/10/93 32 * $FreeBSD$ 33 */ 34 35 #ifndef _NETINET_TCP_H_ 36 #define _NETINET_TCP_H_ 37 38 #include <sys/cdefs.h> 39 #include <sys/types.h> 40 41 #if __BSD_VISIBLE 42 43 typedef u_int32_t tcp_seq; 44 45 #define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */ 46 #define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */ 47 48 /* 49 * TCP header. 50 * Per RFC 793, September, 1981. 51 */ 52 struct tcphdr { 53 u_short th_sport; /* source port */ 54 u_short th_dport; /* destination port */ 55 tcp_seq th_seq; /* sequence number */ 56 tcp_seq th_ack; /* acknowledgement number */ 57 #if BYTE_ORDER == LITTLE_ENDIAN 58 u_char th_x2:4, /* upper 4 (reserved) flags */ 59 th_off:4; /* data offset */ 60 #endif 61 #if BYTE_ORDER == BIG_ENDIAN 62 u_char th_off:4, /* data offset */ 63 th_x2:4; /* upper 4 (reserved) flags */ 64 #endif 65 u_char th_flags; 66 #define TH_FIN 0x01 67 #define TH_SYN 0x02 68 #define TH_RST 0x04 69 #define TH_PUSH 0x08 70 #define TH_ACK 0x10 71 #define TH_URG 0x20 72 #define TH_ECE 0x40 73 #define TH_CWR 0x80 74 #define TH_AE 0x100 /* maps into th_x2 */ 75 #define TH_RES3 0x200 76 #define TH_RES2 0x400 77 #define TH_RES1 0x800 78 #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG|TH_ECE|TH_CWR) 79 #define PRINT_TH_FLAGS "\20\1FIN\2SYN\3RST\4PUSH\5ACK\6URG\7ECE\10CWR\11AE" 80 81 u_short th_win; /* window */ 82 u_short th_sum; /* checksum */ 83 u_short th_urp; /* urgent pointer */ 84 }; 85 86 #define PADTCPOLEN(len) ((((len) / 4) + !!((len) % 4)) * 4) 87 88 #define TCPOPT_EOL 0 89 #define TCPOLEN_EOL 1 90 #define TCPOPT_PAD 0 /* padding after EOL */ 91 #define TCPOLEN_PAD 1 92 #define TCPOPT_NOP 1 93 #define TCPOLEN_NOP 1 94 #define TCPOPT_MAXSEG 2 95 #define TCPOLEN_MAXSEG 4 96 #define TCPOPT_WINDOW 3 97 #define TCPOLEN_WINDOW 3 98 #define TCPOPT_SACK_PERMITTED 4 99 #define TCPOLEN_SACK_PERMITTED 2 100 #define TCPOPT_SACK 5 101 #define TCPOLEN_SACKHDR 2 102 #define TCPOLEN_SACK 8 /* 2*sizeof(tcp_seq) */ 103 #define TCPOPT_TIMESTAMP 8 104 #define TCPOLEN_TIMESTAMP 10 105 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 106 #define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */ 107 #define TCPOLEN_SIGNATURE 18 108 #define TCPOPT_FAST_OPEN 34 109 #define TCPOLEN_FAST_OPEN_EMPTY 2 110 111 #define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */ 112 113 /* Miscellaneous constants */ 114 #define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at receiver side */ 115 #define TCP_MAX_SACK 4 /* MAX # SACKs sent in any segment */ 116 117 /* 118 * The default maximum segment size (MSS) to be used for new TCP connections 119 * when path MTU discovery is not enabled. 120 * 121 * RFC879 derives the default MSS from the largest datagram size hosts are 122 * minimally required to handle directly or through IP reassembly minus the 123 * size of the IP and TCP header. With IPv6 the minimum MTU is specified 124 * in RFC2460. 125 * 126 * For IPv4 the MSS is 576 - sizeof(struct tcpiphdr) 127 * For IPv6 the MSS is IPV6_MMTU - sizeof(struct ip6_hdr) - sizeof(struct tcphdr) 128 * 129 * We use explicit numerical definition here to avoid header pollution. 130 */ 131 #define TCP_MSS 536 132 #define TCP6_MSS 1220 133 134 /* 135 * Limit the lowest MSS we accept for path MTU discovery and the TCP SYN MSS 136 * option. Allowing low values of MSS can consume significant resources and 137 * be used to mount a resource exhaustion attack. 138 * Connections requesting lower MSS values will be rounded up to this value 139 * and the IP_DF flag will be cleared to allow fragmentation along the path. 140 * 141 * See tcp_subr.c tcp_minmss SYSCTL declaration for more comments. Setting 142 * it to "0" disables the minmss check. 143 * 144 * The default value is fine for TCP across the Internet's smallest official 145 * link MTU (256 bytes for AX.25 packet radio). However, a connection is very 146 * unlikely to come across such low MTU interfaces these days (anno domini 2003). 147 */ 148 #define TCP_MINMSS 216 149 150 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ 151 #define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */ 152 153 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ 154 155 #define TCP_MAXBURST 4 /* maximum segments in a burst */ 156 157 #define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */ 158 #define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr)) 159 /* max space left for options */ 160 161 #define TCP_FASTOPEN_MIN_COOKIE_LEN 4 /* Per RFC7413 */ 162 #define TCP_FASTOPEN_MAX_COOKIE_LEN 16 /* Per RFC7413 */ 163 #define TCP_FASTOPEN_PSK_LEN 16 /* Same as TCP_FASTOPEN_KEY_LEN */ 164 #endif /* __BSD_VISIBLE */ 165 166 /* 167 * User-settable options (used with setsockopt). These are discrete 168 * values and are not masked together. Some values appear to be 169 * bitmasks for historical reasons. 170 */ 171 #define TCP_NODELAY 1 /* don't delay send to coalesce packets */ 172 #if __BSD_VISIBLE 173 #define TCP_MAXSEG 2 /* set maximum segment size */ 174 #define TCP_NOPUSH 4 /* don't push last block of write */ 175 #define TCP_NOOPT 8 /* don't use TCP options */ 176 #define TCP_MD5SIG 16 /* use MD5 digests (RFC2385) */ 177 #define TCP_INFO 32 /* retrieve tcp_info structure */ 178 #define TCP_STATS 33 /* retrieve stats blob structure */ 179 #define TCP_LOG 34 /* configure event logging for connection */ 180 #define TCP_LOGBUF 35 /* retrieve event log for connection */ 181 #define TCP_LOGID 36 /* configure log ID to correlate connections */ 182 #define TCP_LOGDUMP 37 /* dump connection log events to device */ 183 #define TCP_LOGDUMPID 38 /* dump events from connections with same ID to 184 device */ 185 #define TCP_TXTLS_ENABLE 39 /* TLS framing and encryption for transmit */ 186 #define TCP_TXTLS_MODE 40 /* Transmit TLS mode */ 187 #define TCP_RXTLS_ENABLE 41 /* TLS framing and encryption for receive */ 188 #define TCP_RXTLS_MODE 42 /* Receive TLS mode */ 189 #define TCP_IWND_NB 43 /* Override initial window (units: bytes) */ 190 #define TCP_IWND_NSEG 44 /* Override initial window (units: MSS segs) */ 191 #define TCP_LOGID_CNT 46 /* get number of connections with the same ID */ 192 #define TCP_LOG_TAG 47 /* configure tag for grouping logs */ 193 #define TCP_USER_LOG 48 /* userspace log event */ 194 #define TCP_CONGESTION 64 /* get/set congestion control algorithm */ 195 #define TCP_CCALGOOPT 65 /* get/set cc algorithm specific options */ 196 #define TCP_MAXUNACKTIME 68 /* maximum time without making progress (sec) */ 197 #define TCP_MAXPEAKRATE 69 /* maximum peak rate allowed (kbps) */ 198 #define TCP_IDLE_REDUCE 70 /* Reduce cwnd on idle input */ 199 #define TCP_REMOTE_UDP_ENCAPS_PORT 71 /* Enable TCP over UDP tunneling via the specified port */ 200 #define TCP_DELACK 72 /* socket option for delayed ack */ 201 #define TCP_FIN_IS_RST 73 /* A fin from the peer is treated has a RST */ 202 #define TCP_LOG_LIMIT 74 /* Limit to number of records in tcp-log */ 203 #define TCP_SHARED_CWND_ALLOWED 75 /* Use of a shared cwnd is allowed */ 204 #define TCP_PROC_ACCOUNTING 76 /* Do accounting on tcp cpu usage and counts */ 205 #define TCP_USE_CMP_ACKS 77 /* The transport can handle the Compressed mbuf acks */ 206 #define TCP_PERF_INFO 78 /* retrieve accounting counters */ 207 #define TCP_LRD 79 /* toggle Lost Retransmission Detection for A/B testing */ 208 #define TCP_KEEPINIT 128 /* N, time to establish connection */ 209 #define TCP_KEEPIDLE 256 /* L,N,X start keeplives after this period */ 210 #define TCP_KEEPINTVL 512 /* L,N interval between keepalives */ 211 #define TCP_KEEPCNT 1024 /* L,N number of keepalives before close */ 212 #define TCP_FASTOPEN 1025 /* enable TFO / was created via TFO */ 213 #define TCP_PCAP_OUT 2048 /* number of output packets to keep */ 214 #define TCP_PCAP_IN 4096 /* number of input packets to keep */ 215 #define TCP_FUNCTION_BLK 8192 /* Set the tcp function pointers to the specified stack */ 216 #define TCP_FUNCTION_ALIAS 8193 /* Get the current tcp function pointer name alias */ 217 /* Options for Rack and BBR */ 218 #define TCP_REUSPORT_LB_NUMA 1026 /* set listen socket numa domain */ 219 #define TCP_RACK_MBUF_QUEUE 1050 /* Do we allow mbuf queuing if supported */ 220 #define TCP_RACK_PROP 1051 /* RACK proportional rate reduction (bool) */ 221 #define TCP_RACK_TLP_REDUCE 1052 /* RACK TLP cwnd reduction (bool) */ 222 #define TCP_RACK_PACE_REDUCE 1053 /* RACK Pacingv reduction factor (divisor) */ 223 #define TCP_RACK_PACE_MAX_SEG 1054 /* Max TSO size we will send */ 224 #define TCP_RACK_PACE_ALWAYS 1055 /* Use the always pace method */ 225 #define TCP_RACK_PROP_RATE 1056 /* The proportional reduction rate */ 226 #define TCP_RACK_PRR_SENDALOT 1057 /* Allow PRR to send more than one seg */ 227 #define TCP_RACK_MIN_TO 1058 /* Minimum time between rack t-o's in ms */ 228 #define TCP_RACK_EARLY_RECOV 1059 /* Should recovery happen early (bool) */ 229 #define TCP_RACK_EARLY_SEG 1060 /* If early recovery max segments */ 230 #define TCP_RACK_REORD_THRESH 1061 /* RACK reorder threshold (shift amount) */ 231 #define TCP_RACK_REORD_FADE 1062 /* Does reordering fade after ms time */ 232 #define TCP_RACK_TLP_THRESH 1063 /* RACK TLP theshold i.e. srtt+(srtt/N) */ 233 #define TCP_RACK_PKT_DELAY 1064 /* RACK added ms i.e. rack-rtt + reord + N */ 234 #define TCP_RACK_TLP_INC_VAR 1065 /* Does TLP include rtt variance in t-o */ 235 #define TCP_BBR_IWINTSO 1067 /* Initial TSO window for BBRs first sends */ 236 #define TCP_BBR_RECFORCE 1068 /* Enter recovery force out a segment disregard pacer no longer valid */ 237 #define TCP_BBR_STARTUP_PG 1069 /* Startup pacing gain */ 238 #define TCP_BBR_DRAIN_PG 1070 /* Drain pacing gain */ 239 #define TCP_BBR_RWND_IS_APP 1071 /* Rwnd limited is considered app limited */ 240 #define TCP_BBR_PROBE_RTT_INT 1072 /* How long in useconds between probe-rtt */ 241 #define TCP_BBR_ONE_RETRAN 1073 /* Is only one segment allowed out during retran */ 242 #define TCP_BBR_STARTUP_LOSS_EXIT 1074 /* Do we exit a loss during startup if not 20% incr */ 243 #define TCP_BBR_USE_LOWGAIN 1075 /* lower the gain in PROBE_BW enable */ 244 #define TCP_BBR_LOWGAIN_THRESH 1076 /* Unused after 2.3 morphs to TSLIMITS >= 2.3 */ 245 #define TCP_BBR_TSLIMITS 1076 /* Do we use experimental Timestamp limiting for our algo */ 246 #define TCP_BBR_LOWGAIN_HALF 1077 /* Unused after 2.3 */ 247 #define TCP_BBR_PACE_OH 1077 /* Reused in 4.2 for pacing overhead setting */ 248 #define TCP_BBR_LOWGAIN_FD 1078 /* Unused after 2.3 */ 249 #define TCP_BBR_HOLD_TARGET 1078 /* For 4.3 on */ 250 #define TCP_BBR_USEDEL_RATE 1079 /* Enable use of delivery rate for loss recovery */ 251 #define TCP_BBR_MIN_RTO 1080 /* Min RTO in milliseconds */ 252 #define TCP_BBR_MAX_RTO 1081 /* Max RTO in milliseconds */ 253 #define TCP_BBR_REC_OVER_HPTS 1082 /* Recovery override htps settings 0/1/3 */ 254 #define TCP_BBR_UNLIMITED 1083 /* Not used before 2.3 and morphs to algorithm >= 2.3 */ 255 #define TCP_BBR_ALGORITHM 1083 /* What measurement algo does BBR use netflix=0, google=1 */ 256 #define TCP_BBR_DRAIN_INC_EXTRA 1084 /* Does the 3/4 drain target include the extra gain */ 257 #define TCP_BBR_STARTUP_EXIT_EPOCH 1085 /* what epoch gets us out of startup */ 258 #define TCP_BBR_PACE_PER_SEC 1086 259 #define TCP_BBR_PACE_DEL_TAR 1087 260 #define TCP_BBR_PACE_SEG_MAX 1088 261 #define TCP_BBR_PACE_SEG_MIN 1089 262 #define TCP_BBR_PACE_CROSS 1090 263 #define TCP_RACK_IDLE_REDUCE_HIGH 1092 /* Reduce the highest cwnd seen to IW on idle */ 264 #define TCP_RACK_MIN_PACE 1093 /* Do we enforce rack min pace time */ 265 #define TCP_RACK_MIN_PACE_SEG 1094 /* If so what is the seg threshould */ 266 #define TCP_RACK_GP_INCREASE 1094 /* After 4.1 its the GP increase in older rack */ 267 #define TCP_RACK_TLP_USE 1095 268 #define TCP_BBR_ACK_COMP_ALG 1096 /* Not used */ 269 #define TCP_BBR_TMR_PACE_OH 1096 /* Recycled in 4.2 */ 270 #define TCP_BBR_EXTRA_GAIN 1097 271 #define TCP_RACK_DO_DETECTION 1097 /* Recycle of extra gain for rack, attack detection */ 272 #define TCP_BBR_RACK_RTT_USE 1098 /* what RTT should we use 0, 1, or 2? */ 273 #define TCP_BBR_RETRAN_WTSO 1099 274 #define TCP_DATA_AFTER_CLOSE 1100 275 #define TCP_BBR_PROBE_RTT_GAIN 1101 276 #define TCP_BBR_PROBE_RTT_LEN 1102 277 #define TCP_BBR_SEND_IWND_IN_TSO 1103 /* Do we burst out whole iwin size chunks at start? */ 278 #define TCP_BBR_USE_RACK_RR 1104 /* Do we use the rack rapid recovery for pacing rxt's */ 279 #define TCP_BBR_USE_RACK_CHEAT TCP_BBR_USE_RACK_RR /* Compat. */ 280 #define TCP_BBR_HDWR_PACE 1105 /* Enable/disable hardware pacing */ 281 #define TCP_BBR_UTTER_MAX_TSO 1106 /* Do we enforce an utter max TSO size */ 282 #define TCP_BBR_EXTRA_STATE 1107 /* Special exit-persist catch up */ 283 #define TCP_BBR_FLOOR_MIN_TSO 1108 /* The min tso size */ 284 #define TCP_BBR_MIN_TOPACEOUT 1109 /* Do we suspend pacing until */ 285 #define TCP_BBR_TSTMP_RAISES 1110 /* Can a timestamp measurement raise the b/w */ 286 #define TCP_BBR_POLICER_DETECT 1111 /* Turn on/off google mode policer detection */ 287 #define TCP_BBR_RACK_INIT_RATE 1112 /* Set an initial pacing rate for when we have no b/w in kbits per sec */ 288 #define TCP_RACK_RR_CONF 1113 /* Rack rapid recovery configuration control*/ 289 #define TCP_RACK_CHEAT_NOT_CONF_RATE TCP_RACK_RR_CONF 290 #define TCP_RACK_GP_INCREASE_CA 1114 /* GP increase for Congestion Avoidance */ 291 #define TCP_RACK_GP_INCREASE_SS 1115 /* GP increase for Slow Start */ 292 #define TCP_RACK_GP_INCREASE_REC 1116 /* GP increase for Recovery */ 293 #define TCP_RACK_FORCE_MSEG 1117 /* Override to use the user set max-seg value */ 294 #define TCP_RACK_PACE_RATE_CA 1118 /* Pacing rate for Congestion Avoidance */ 295 #define TCP_RACK_PACE_RATE_SS 1119 /* Pacing rate for Slow Start */ 296 #define TCP_RACK_PACE_RATE_REC 1120 /* Pacing rate for Recovery */ 297 #define TCP_NO_PRR 1122 /* If pacing, don't use prr */ 298 #define TCP_RACK_NONRXT_CFG_RATE 1123 /* In recovery does a non-rxt use the cfg rate */ 299 #define TCP_SHARED_CWND_ENABLE 1124 /* Use a shared cwnd if allowed */ 300 #define TCP_TIMELY_DYN_ADJ 1125 /* Do we attempt dynamic multipler adjustment with timely. */ 301 #define TCP_RACK_NO_PUSH_AT_MAX 1126 /* For timely do not push if we are over max rtt */ 302 #define TCP_RACK_PACE_TO_FILL 1127 /* If we are not in recovery, always pace to fill the cwnd in 1 RTT */ 303 #define TCP_SHARED_CWND_TIME_LIMIT 1128 /* we should limit to low time values the scwnd life */ 304 #define TCP_RACK_PROFILE 1129 /* Select a profile that sets multiple options */ 305 #define TCP_HDWR_RATE_CAP 1130 /* Allow hardware rates to cap pacing rate */ 306 #define TCP_PACING_RATE_CAP 1131 /* Highest rate allowed in pacing in bytes per second (uint64_t) */ 307 #define TCP_HDWR_UP_ONLY 1132 /* Allow the pacing rate to climb but not descend (with the exception of fill-cw */ 308 #define TCP_RACK_ABC_VAL 1133 /* Set a local ABC value different then the system default */ 309 #define TCP_REC_ABC_VAL 1134 /* Do we use the ABC value for recovery or the override one from sysctl */ 310 #define TCP_RACK_MEASURE_CNT 1135 /* How many measurements are required in GP pacing */ 311 #define TCP_DEFER_OPTIONS 1136 /* Defer options until the proper number of measurements occur, does not defer TCP_RACK_MEASURE_CNT */ 312 #define TCP_FAST_RSM_HACK 1137 /* Do we do the broken thing where we don't twiddle the TLP bits properly in fast_rsm_output? */ 313 #define TCP_RACK_PACING_BETA 1138 /* Changing the beta for pacing */ 314 #define TCP_RACK_PACING_BETA_ECN 1139 /* Changing the beta for ecn with pacing */ 315 #define TCP_RACK_TIMER_SLOP 1140 /* Set or get the timer slop used */ 316 #define TCP_RACK_DSACK_OPT 1141 /* How do we setup rack timer DSACK options bit 1/2 */ 317 #define TCP_RACK_ENABLE_HYSTART 1142 /* Do we allow hystart in the CC modules */ 318 /* Start of reserved space for third-party user-settable options. */ 319 #define TCP_VENDOR SO_VENDOR 320 321 #define TCP_CA_NAME_MAX 16 /* max congestion control name length */ 322 323 #define TCPI_OPT_TIMESTAMPS 0x01 324 #define TCPI_OPT_SACK 0x02 325 #define TCPI_OPT_WSCALE 0x04 326 #define TCPI_OPT_ECN 0x08 327 #define TCPI_OPT_TOE 0x10 328 #define TCPI_OPT_TFO 0x20 329 330 /* Maximum length of log ID. */ 331 #define TCP_LOG_ID_LEN 64 332 333 /* 334 * The TCP_INFO socket option comes from the Linux 2.6 TCP API, and permits 335 * the caller to query certain information about the state of a TCP 336 * connection. We provide an overlapping set of fields with the Linux 337 * implementation, but since this is a fixed size structure, room has been 338 * left for growth. In order to maximize potential future compatibility with 339 * the Linux API, the same variable names and order have been adopted, and 340 * padding left to make room for omitted fields in case they are added later. 341 * 342 * XXX: This is currently an unstable ABI/API, in that it is expected to 343 * change. 344 */ 345 struct tcp_info { 346 u_int8_t tcpi_state; /* TCP FSM state. */ 347 u_int8_t __tcpi_ca_state; 348 u_int8_t __tcpi_retransmits; 349 u_int8_t __tcpi_probes; 350 u_int8_t __tcpi_backoff; 351 u_int8_t tcpi_options; /* Options enabled on conn. */ 352 u_int8_t tcpi_snd_wscale:4, /* RFC1323 send shift value. */ 353 tcpi_rcv_wscale:4; /* RFC1323 recv shift value. */ 354 355 u_int32_t tcpi_rto; /* Retransmission timeout (usec). */ 356 u_int32_t __tcpi_ato; 357 u_int32_t tcpi_snd_mss; /* Max segment size for send. */ 358 u_int32_t tcpi_rcv_mss; /* Max segment size for receive. */ 359 360 u_int32_t __tcpi_unacked; 361 u_int32_t __tcpi_sacked; 362 u_int32_t __tcpi_lost; 363 u_int32_t __tcpi_retrans; 364 u_int32_t __tcpi_fackets; 365 366 /* Times; measurements in usecs. */ 367 u_int32_t __tcpi_last_data_sent; 368 u_int32_t __tcpi_last_ack_sent; /* Also unimpl. on Linux? */ 369 u_int32_t tcpi_last_data_recv; /* Time since last recv data. */ 370 u_int32_t __tcpi_last_ack_recv; 371 372 /* Metrics; variable units. */ 373 u_int32_t __tcpi_pmtu; 374 u_int32_t __tcpi_rcv_ssthresh; 375 u_int32_t tcpi_rtt; /* Smoothed RTT in usecs. */ 376 u_int32_t tcpi_rttvar; /* RTT variance in usecs. */ 377 u_int32_t tcpi_snd_ssthresh; /* Slow start threshold. */ 378 u_int32_t tcpi_snd_cwnd; /* Send congestion window. */ 379 u_int32_t __tcpi_advmss; 380 u_int32_t __tcpi_reordering; 381 382 u_int32_t __tcpi_rcv_rtt; 383 u_int32_t tcpi_rcv_space; /* Advertised recv window. */ 384 385 /* FreeBSD extensions to tcp_info. */ 386 u_int32_t tcpi_snd_wnd; /* Advertised send window. */ 387 u_int32_t tcpi_snd_bwnd; /* No longer used. */ 388 u_int32_t tcpi_snd_nxt; /* Next egress seqno */ 389 u_int32_t tcpi_rcv_nxt; /* Next ingress seqno */ 390 u_int32_t tcpi_toe_tid; /* HWTID for TOE endpoints */ 391 u_int32_t tcpi_snd_rexmitpack; /* Retransmitted packets */ 392 u_int32_t tcpi_rcv_ooopack; /* Out-of-order packets */ 393 u_int32_t tcpi_snd_zerowin; /* Zero-sized windows sent */ 394 395 /* Accurate ECN counters. */ 396 u_int32_t tcpi_delivered_ce; 397 u_int32_t tcpi_received_ce; /* # of CE marks received */ 398 u_int32_t __tcpi_delivered_e1_bytes; 399 u_int32_t __tcpi_delivered_e0_bytes; 400 u_int32_t __tcpi_delivered_ce_bytes; 401 u_int32_t __tcpi_received_e1_bytes; 402 u_int32_t __tcpi_received_e0_bytes; 403 u_int32_t __tcpi_received_ce_bytes; 404 405 /* Padding to grow without breaking ABI. */ 406 u_int32_t __tcpi_pad[19]; /* Padding. */ 407 }; 408 409 /* 410 * If this structure is provided when setting the TCP_FASTOPEN socket 411 * option, and the enable member is non-zero, a subsequent connect will use 412 * pre-shared key (PSK) mode using the provided key. 413 */ 414 struct tcp_fastopen { 415 int enable; 416 uint8_t psk[TCP_FASTOPEN_PSK_LEN]; 417 }; 418 #endif 419 #define TCP_FUNCTION_NAME_LEN_MAX 32 420 421 struct tcp_function_set { 422 char function_set_name[TCP_FUNCTION_NAME_LEN_MAX]; 423 uint32_t pcbcnt; 424 }; 425 426 /* TLS modes for TCP_TXTLS_MODE */ 427 #define TCP_TLS_MODE_NONE 0 428 #define TCP_TLS_MODE_SW 1 429 #define TCP_TLS_MODE_IFNET 2 430 #define TCP_TLS_MODE_TOE 3 431 432 /* 433 * TCP Control message types 434 */ 435 #define TLS_SET_RECORD_TYPE 1 436 #define TLS_GET_RECORD 2 437 438 /* 439 * TCP specific variables of interest for tp->t_stats stats(9) accounting. 440 */ 441 #define VOI_TCP_TXPB 0 /* Transmit payload bytes */ 442 #define VOI_TCP_RETXPB 1 /* Retransmit payload bytes */ 443 #define VOI_TCP_FRWIN 2 /* Foreign receive window */ 444 #define VOI_TCP_LCWIN 3 /* Local congesiton window */ 445 #define VOI_TCP_RTT 4 /* Round trip time */ 446 #define VOI_TCP_CSIG 5 /* Congestion signal */ 447 #define VOI_TCP_GPUT 6 /* Goodput */ 448 #define VOI_TCP_CALCFRWINDIFF 7 /* Congestion avoidance LCWIN - FRWIN */ 449 #define VOI_TCP_GPUT_ND 8 /* Goodput normalised delta */ 450 #define VOI_TCP_ACKLEN 9 /* Average ACKed bytes per ACK */ 451 452 #define TCP_REUSPORT_LB_NUMA_NODOM (-2) /* remove numa binding */ 453 #define TCP_REUSPORT_LB_NUMA_CURDOM (-1) /* bind to current domain */ 454 455 #endif /* !_NETINET_TCP_H_ */ 456