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