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freebsd/sys/netinet/tcp.h
Kristof Provost 8e1864ed07 pf: syncookie support 
Import OpenBSD's syncookie support for pf. This feature help pf resist
TCP SYN floods by only creating states once the remote host completes
the TCP handshake rather than when the initial SYN packet is received.

This is accomplished by using the initial sequence numbers to encode a
cookie (hence the name) in the SYN+ACK response and verifying this on
receipt of the client ACK.

Reviewed by:	kbowling
Obtained from:	OpenBSD
MFC after:	1 week
Sponsored by:	Modirum MDPay
Differential Revision:	https://reviews.freebsd.org/D31138
2021-07-20 10:36:13 +02:00

441 lines
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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)tcp.h 8.1 (Berkeley) 6/10/93
* $FreeBSD$
*/
#ifndef _NETINET_TCP_H_
#define _NETINET_TCP_H_
#include <sys/cdefs.h>
#include <sys/types.h>
#if __BSD_VISIBLE
typedef u_int32_t tcp_seq;
#define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */
#define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */
/*
* TCP header.
* Per RFC 793, September, 1981.
*/
struct tcphdr {
u_short th_sport; /* source port */
u_short th_dport; /* destination port */
tcp_seq th_seq; /* sequence number */
tcp_seq th_ack; /* acknowledgement number */
#if BYTE_ORDER == LITTLE_ENDIAN
u_char th_x2:4, /* (unused) */
th_off:4; /* data offset */
#endif
#if BYTE_ORDER == BIG_ENDIAN
u_char th_off:4, /* data offset */
th_x2:4; /* (unused) */
#endif
u_char th_flags;
#define TH_FIN 0x01
#define TH_SYN 0x02
#define TH_RST 0x04
#define TH_PUSH 0x08
#define TH_ACK 0x10
#define TH_URG 0x20
#define TH_ECE 0x40
#define TH_CWR 0x80
#define TH_AE 0x100 /* maps into th_x2 */
#define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG|TH_ECE|TH_CWR)
#define PRINT_TH_FLAGS "\20\1FIN\2SYN\3RST\4PUSH\5ACK\6URG\7ECE\10CWR\11AE"
u_short th_win; /* window */
u_short th_sum; /* checksum */
u_short th_urp; /* urgent pointer */
};
#define PADTCPOLEN(len) ((((len) / 4) + !!((len) % 4)) * 4)
#define TCPOPT_EOL 0
#define TCPOLEN_EOL 1
#define TCPOPT_PAD 0 /* padding after EOL */
#define TCPOLEN_PAD 1
#define TCPOPT_NOP 1
#define TCPOLEN_NOP 1
#define TCPOPT_MAXSEG 2
#define TCPOLEN_MAXSEG 4
#define TCPOPT_WINDOW 3
#define TCPOLEN_WINDOW 3
#define TCPOPT_SACK_PERMITTED 4
#define TCPOLEN_SACK_PERMITTED 2
#define TCPOPT_SACK 5
#define TCPOLEN_SACKHDR 2
#define TCPOLEN_SACK 8 /* 2*sizeof(tcp_seq) */
#define TCPOPT_TIMESTAMP 8
#define TCPOLEN_TIMESTAMP 10
#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
#define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */
#define TCPOLEN_SIGNATURE 18
#define TCPOPT_FAST_OPEN 34
#define TCPOLEN_FAST_OPEN_EMPTY 2
#define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */
/* Miscellaneous constants */
#define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at receiver side */
#define TCP_MAX_SACK 4 /* MAX # SACKs sent in any segment */
/*
* The default maximum segment size (MSS) to be used for new TCP connections
* when path MTU discovery is not enabled.
*
* RFC879 derives the default MSS from the largest datagram size hosts are
* minimally required to handle directly or through IP reassembly minus the
* size of the IP and TCP header. With IPv6 the minimum MTU is specified
* in RFC2460.
*
* For IPv4 the MSS is 576 - sizeof(struct tcpiphdr)
* For IPv6 the MSS is IPV6_MMTU - sizeof(struct ip6_hdr) - sizeof(struct tcphdr)
*
* We use explicit numerical definition here to avoid header pollution.
*/
#define TCP_MSS 536
#define TCP6_MSS 1220
/*
* Limit the lowest MSS we accept for path MTU discovery and the TCP SYN MSS
* option. Allowing low values of MSS can consume significant resources and
* be used to mount a resource exhaustion attack.
* Connections requesting lower MSS values will be rounded up to this value
* and the IP_DF flag will be cleared to allow fragmentation along the path.
*
* See tcp_subr.c tcp_minmss SYSCTL declaration for more comments. Setting
* it to "0" disables the minmss check.
*
* The default value is fine for TCP across the Internet's smallest official
* link MTU (256 bytes for AX.25 packet radio). However, a connection is very
* unlikely to come across such low MTU interfaces these days (anno domini 2003).
*/
#define TCP_MINMSS 216
#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
#define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */
#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
#define TCP_MAXBURST 4 /* maximum segments in a burst */
#define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */
#define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr))
/* max space left for options */
#define TCP_FASTOPEN_MIN_COOKIE_LEN 4 /* Per RFC7413 */
#define TCP_FASTOPEN_MAX_COOKIE_LEN 16 /* Per RFC7413 */
#define TCP_FASTOPEN_PSK_LEN 16 /* Same as TCP_FASTOPEN_KEY_LEN */
#endif /* __BSD_VISIBLE */
/*
* User-settable options (used with setsockopt). These are discrete
* values and are not masked together. Some values appear to be
* bitmasks for historical reasons.
*/
#define TCP_NODELAY 1 /* don't delay send to coalesce packets */
#if __BSD_VISIBLE
#define TCP_MAXSEG 2 /* set maximum segment size */
#define TCP_NOPUSH 4 /* don't push last block of write */
#define TCP_NOOPT 8 /* don't use TCP options */
#define TCP_MD5SIG 16 /* use MD5 digests (RFC2385) */
#define TCP_INFO 32 /* retrieve tcp_info structure */
#define TCP_STATS 33 /* retrieve stats blob structure */
#define TCP_LOG 34 /* configure event logging for connection */
#define TCP_LOGBUF 35 /* retrieve event log for connection */
#define TCP_LOGID 36 /* configure log ID to correlate connections */
#define TCP_LOGDUMP 37 /* dump connection log events to device */
#define TCP_LOGDUMPID 38 /* dump events from connections with same ID to
device */
#define TCP_TXTLS_ENABLE 39 /* TLS framing and encryption for transmit */
#define TCP_TXTLS_MODE 40 /* Transmit TLS mode */
#define TCP_RXTLS_ENABLE 41 /* TLS framing and encryption for receive */
#define TCP_RXTLS_MODE 42 /* Receive TLS mode */
#define TCP_IWND_NB 43 /* Override initial window (units: bytes) */
#define TCP_IWND_NSEG 44 /* Override initial window (units: MSS segs) */
#define TCP_LOGID_CNT 46 /* get number of connections with the same ID */
#define TCP_LOG_TAG 47 /* configure tag for grouping logs */
#define TCP_USER_LOG 48 /* userspace log event */
#define TCP_CONGESTION 64 /* get/set congestion control algorithm */
#define TCP_CCALGOOPT 65 /* get/set cc algorithm specific options */
#define TCP_MAXUNACKTIME 68 /* maximum time without making progress (sec) */
#define TCP_MAXPEAKRATE 69 /* maximum peak rate allowed (kbps) */
#define TCP_IDLE_REDUCE 70 /* Reduce cwnd on idle input */
#define TCP_REMOTE_UDP_ENCAPS_PORT 71 /* Enable TCP over UDP tunneling via the specified port */
#define TCP_DELACK 72 /* socket option for delayed ack */
#define TCP_FIN_IS_RST 73 /* A fin from the peer is treated has a RST */
#define TCP_LOG_LIMIT 74 /* Limit to number of records in tcp-log */
#define TCP_SHARED_CWND_ALLOWED 75 /* Use of a shared cwnd is allowed */
#define TCP_PROC_ACCOUNTING 76 /* Do accounting on tcp cpu usage and counts */
#define TCP_USE_CMP_ACKS 77 /* The transport can handle the Compressed mbuf acks */
#define TCP_PERF_INFO 78 /* retrieve accounting counters */
#define TCP_LRD 79 /* toggle Lost Retransmission Detection for A/B testing */
#define TCP_KEEPINIT 128 /* N, time to establish connection */
#define TCP_KEEPIDLE 256 /* L,N,X start keeplives after this period */
#define TCP_KEEPINTVL 512 /* L,N interval between keepalives */
#define TCP_KEEPCNT 1024 /* L,N number of keepalives before close */
#define TCP_FASTOPEN 1025 /* enable TFO / was created via TFO */
#define TCP_PCAP_OUT 2048 /* number of output packets to keep */
#define TCP_PCAP_IN 4096 /* number of input packets to keep */
#define TCP_FUNCTION_BLK 8192 /* Set the tcp function pointers to the specified stack */
/* Options for Rack and BBR */
#define TCP_REUSPORT_LB_NUMA 1026 /* set listen socket numa domain */
#define TCP_RACK_MBUF_QUEUE 1050 /* Do we allow mbuf queuing if supported */
#define TCP_RACK_PROP 1051 /* RACK proportional rate reduction (bool) */
#define TCP_RACK_TLP_REDUCE 1052 /* RACK TLP cwnd reduction (bool) */
#define TCP_RACK_PACE_REDUCE 1053 /* RACK Pacingv reduction factor (divisor) */
#define TCP_RACK_PACE_MAX_SEG 1054 /* Max TSO size we will send */
#define TCP_RACK_PACE_ALWAYS 1055 /* Use the always pace method */
#define TCP_RACK_PROP_RATE 1056 /* The proportional reduction rate */
#define TCP_RACK_PRR_SENDALOT 1057 /* Allow PRR to send more than one seg */
#define TCP_RACK_MIN_TO 1058 /* Minimum time between rack t-o's in ms */
#define TCP_RACK_EARLY_RECOV 1059 /* Should recovery happen early (bool) */
#define TCP_RACK_EARLY_SEG 1060 /* If early recovery max segments */
#define TCP_RACK_REORD_THRESH 1061 /* RACK reorder threshold (shift amount) */
#define TCP_RACK_REORD_FADE 1062 /* Does reordering fade after ms time */
#define TCP_RACK_TLP_THRESH 1063 /* RACK TLP theshold i.e. srtt+(srtt/N) */
#define TCP_RACK_PKT_DELAY 1064 /* RACK added ms i.e. rack-rtt + reord + N */
#define TCP_RACK_TLP_INC_VAR 1065 /* Does TLP include rtt variance in t-o */
#define TCP_BBR_IWINTSO 1067 /* Initial TSO window for BBRs first sends */
#define TCP_BBR_RECFORCE 1068 /* Enter recovery force out a segment disregard pacer no longer valid */
#define TCP_BBR_STARTUP_PG 1069 /* Startup pacing gain */
#define TCP_BBR_DRAIN_PG 1070 /* Drain pacing gain */
#define TCP_BBR_RWND_IS_APP 1071 /* Rwnd limited is considered app limited */
#define TCP_BBR_PROBE_RTT_INT 1072 /* How long in useconds between probe-rtt */
#define TCP_BBR_ONE_RETRAN 1073 /* Is only one segment allowed out during retran */
#define TCP_BBR_STARTUP_LOSS_EXIT 1074 /* Do we exit a loss during startup if not 20% incr */
#define TCP_BBR_USE_LOWGAIN 1075 /* lower the gain in PROBE_BW enable */
#define TCP_BBR_LOWGAIN_THRESH 1076 /* Unused after 2.3 morphs to TSLIMITS >= 2.3 */
#define TCP_BBR_TSLIMITS 1076 /* Do we use experimental Timestamp limiting for our algo */
#define TCP_BBR_LOWGAIN_HALF 1077 /* Unused after 2.3 */
#define TCP_BBR_PACE_OH 1077 /* Reused in 4.2 for pacing overhead setting */
#define TCP_BBR_LOWGAIN_FD 1078 /* Unused after 2.3 */
#define TCP_BBR_HOLD_TARGET 1078 /* For 4.3 on */
#define TCP_BBR_USEDEL_RATE 1079 /* Enable use of delivery rate for loss recovery */
#define TCP_BBR_MIN_RTO 1080 /* Min RTO in milliseconds */
#define TCP_BBR_MAX_RTO 1081 /* Max RTO in milliseconds */
#define TCP_BBR_REC_OVER_HPTS 1082 /* Recovery override htps settings 0/1/3 */
#define TCP_BBR_UNLIMITED 1083 /* Not used before 2.3 and morphs to algorithm >= 2.3 */
#define TCP_BBR_ALGORITHM 1083 /* What measurement algo does BBR use netflix=0, google=1 */
#define TCP_BBR_DRAIN_INC_EXTRA 1084 /* Does the 3/4 drain target include the extra gain */
#define TCP_BBR_STARTUP_EXIT_EPOCH 1085 /* what epoch gets us out of startup */
#define TCP_BBR_PACE_PER_SEC 1086
#define TCP_BBR_PACE_DEL_TAR 1087
#define TCP_BBR_PACE_SEG_MAX 1088
#define TCP_BBR_PACE_SEG_MIN 1089
#define TCP_BBR_PACE_CROSS 1090
#define TCP_RACK_IDLE_REDUCE_HIGH 1092 /* Reduce the highest cwnd seen to IW on idle */
#define TCP_RACK_MIN_PACE 1093 /* Do we enforce rack min pace time */
#define TCP_RACK_MIN_PACE_SEG 1094 /* If so what is the seg threshould */
#define TCP_RACK_GP_INCREASE 1094 /* After 4.1 its the GP increase in older rack */
#define TCP_RACK_TLP_USE 1095
#define TCP_BBR_ACK_COMP_ALG 1096 /* Not used */
#define TCP_BBR_TMR_PACE_OH 1096 /* Recycled in 4.2 */
#define TCP_BBR_EXTRA_GAIN 1097
#define TCP_RACK_DO_DETECTION 1097 /* Recycle of extra gain for rack, attack detection */
#define TCP_BBR_RACK_RTT_USE 1098 /* what RTT should we use 0, 1, or 2? */
#define TCP_BBR_RETRAN_WTSO 1099
#define TCP_DATA_AFTER_CLOSE 1100
#define TCP_BBR_PROBE_RTT_GAIN 1101
#define TCP_BBR_PROBE_RTT_LEN 1102
#define TCP_BBR_SEND_IWND_IN_TSO 1103 /* Do we burst out whole iwin size chunks at start? */
#define TCP_BBR_USE_RACK_RR 1104 /* Do we use the rack rapid recovery for pacing rxt's */
#define TCP_BBR_USE_RACK_CHEAT TCP_BBR_USE_RACK_RR /* Compat. */
#define TCP_BBR_HDWR_PACE 1105 /* Enable/disable hardware pacing */
#define TCP_BBR_UTTER_MAX_TSO 1106 /* Do we enforce an utter max TSO size */
#define TCP_BBR_EXTRA_STATE 1107 /* Special exit-persist catch up */
#define TCP_BBR_FLOOR_MIN_TSO 1108 /* The min tso size */
#define TCP_BBR_MIN_TOPACEOUT 1109 /* Do we suspend pacing until */
#define TCP_BBR_TSTMP_RAISES 1110 /* Can a timestamp measurement raise the b/w */
#define TCP_BBR_POLICER_DETECT 1111 /* Turn on/off google mode policer detection */
#define TCP_BBR_RACK_INIT_RATE 1112 /* Set an initial pacing rate for when we have no b/w in kbits per sec */
#define TCP_RACK_RR_CONF 1113 /* Rack rapid recovery configuration control*/
#define TCP_RACK_CHEAT_NOT_CONF_RATE TCP_RACK_RR_CONF
#define TCP_RACK_GP_INCREASE_CA 1114 /* GP increase for Congestion Avoidance */
#define TCP_RACK_GP_INCREASE_SS 1115 /* GP increase for Slow Start */
#define TCP_RACK_GP_INCREASE_REC 1116 /* GP increase for Recovery */
#define TCP_RACK_FORCE_MSEG 1117 /* Override to use the user set max-seg value */
#define TCP_RACK_PACE_RATE_CA 1118 /* Pacing rate for Congestion Avoidance */
#define TCP_RACK_PACE_RATE_SS 1119 /* Pacing rate for Slow Start */
#define TCP_RACK_PACE_RATE_REC 1120 /* Pacing rate for Recovery */
#define TCP_NO_PRR 1122 /* If pacing, don't use prr */
#define TCP_RACK_NONRXT_CFG_RATE 1123 /* In recovery does a non-rxt use the cfg rate */
#define TCP_SHARED_CWND_ENABLE 1124 /* Use a shared cwnd if allowed */
#define TCP_TIMELY_DYN_ADJ 1125 /* Do we attempt dynamic multipler adjustment with timely. */
#define TCP_RACK_NO_PUSH_AT_MAX 1126 /* For timely do not push if we are over max rtt */
#define TCP_RACK_PACE_TO_FILL 1127 /* If we are not in recovery, always pace to fill the cwnd in 1 RTT */
#define TCP_SHARED_CWND_TIME_LIMIT 1128 /* we should limit to low time values the scwnd life */
#define TCP_RACK_PROFILE 1129 /* Select a profile that sets multiple options */
#define TCP_HDWR_RATE_CAP 1130 /* Allow hardware rates to cap pacing rate */
#define TCP_PACING_RATE_CAP 1131 /* Highest rate allowed in pacing in bytes per second (uint64_t) */
#define TCP_HDWR_UP_ONLY 1132 /* Allow the pacing rate to climb but not descend (with the exception of fill-cw */
#define TCP_RACK_ABC_VAL 1133 /* Set a local ABC value different then the system default */
#define TCP_REC_ABC_VAL 1134 /* Do we use the ABC value for recovery or the override one from sysctl */
#define TCP_RACK_MEASURE_CNT 1135 /* How many measurements are required in GP pacing */
#define TCP_DEFER_OPTIONS 1136 /* Defer options until the proper number of measurements occur, does not defer TCP_RACK_MEASURE_CNT */
#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? */
#define TCP_RACK_PACING_BETA 1138 /* Changing the beta for pacing */
#define TCP_RACK_PACING_BETA_ECN 1139 /* Changing the beta for ecn with pacing */
#define TCP_RACK_TIMER_SLOP 1140 /* Set or get the timer slop used */
/* Start of reserved space for third-party user-settable options. */
#define TCP_VENDOR SO_VENDOR
#define TCP_CA_NAME_MAX 16 /* max congestion control name length */
#define TCPI_OPT_TIMESTAMPS 0x01
#define TCPI_OPT_SACK 0x02
#define TCPI_OPT_WSCALE 0x04
#define TCPI_OPT_ECN 0x08
#define TCPI_OPT_TOE 0x10
#define TCPI_OPT_TFO 0x20
/* Maximum length of log ID. */
#define TCP_LOG_ID_LEN 64
/*
* The TCP_INFO socket option comes from the Linux 2.6 TCP API, and permits
* the caller to query certain information about the state of a TCP
* connection. We provide an overlapping set of fields with the Linux
* implementation, but since this is a fixed size structure, room has been
* left for growth. In order to maximize potential future compatibility with
* the Linux API, the same variable names and order have been adopted, and
* padding left to make room for omitted fields in case they are added later.
*
* XXX: This is currently an unstable ABI/API, in that it is expected to
* change.
*/
struct tcp_info {
u_int8_t tcpi_state; /* TCP FSM state. */
u_int8_t __tcpi_ca_state;
u_int8_t __tcpi_retransmits;
u_int8_t __tcpi_probes;
u_int8_t __tcpi_backoff;
u_int8_t tcpi_options; /* Options enabled on conn. */
u_int8_t tcpi_snd_wscale:4, /* RFC1323 send shift value. */
tcpi_rcv_wscale:4; /* RFC1323 recv shift value. */
u_int32_t tcpi_rto; /* Retransmission timeout (usec). */
u_int32_t __tcpi_ato;
u_int32_t tcpi_snd_mss; /* Max segment size for send. */
u_int32_t tcpi_rcv_mss; /* Max segment size for receive. */
u_int32_t __tcpi_unacked;
u_int32_t __tcpi_sacked;
u_int32_t __tcpi_lost;
u_int32_t __tcpi_retrans;
u_int32_t __tcpi_fackets;
/* Times; measurements in usecs. */
u_int32_t __tcpi_last_data_sent;
u_int32_t __tcpi_last_ack_sent; /* Also unimpl. on Linux? */
u_int32_t tcpi_last_data_recv; /* Time since last recv data. */
u_int32_t __tcpi_last_ack_recv;
/* Metrics; variable units. */
u_int32_t __tcpi_pmtu;
u_int32_t __tcpi_rcv_ssthresh;
u_int32_t tcpi_rtt; /* Smoothed RTT in usecs. */
u_int32_t tcpi_rttvar; /* RTT variance in usecs. */
u_int32_t tcpi_snd_ssthresh; /* Slow start threshold. */
u_int32_t tcpi_snd_cwnd; /* Send congestion window. */
u_int32_t __tcpi_advmss;
u_int32_t __tcpi_reordering;
u_int32_t __tcpi_rcv_rtt;
u_int32_t tcpi_rcv_space; /* Advertised recv window. */
/* FreeBSD extensions to tcp_info. */
u_int32_t tcpi_snd_wnd; /* Advertised send window. */
u_int32_t tcpi_snd_bwnd; /* No longer used. */
u_int32_t tcpi_snd_nxt; /* Next egress seqno */
u_int32_t tcpi_rcv_nxt; /* Next ingress seqno */
u_int32_t tcpi_toe_tid; /* HWTID for TOE endpoints */
u_int32_t tcpi_snd_rexmitpack; /* Retransmitted packets */
u_int32_t tcpi_rcv_ooopack; /* Out-of-order packets */
u_int32_t tcpi_snd_zerowin; /* Zero-sized windows sent */
/* Padding to grow without breaking ABI. */
u_int32_t __tcpi_pad[26]; /* Padding. */
};
/*
* If this structure is provided when setting the TCP_FASTOPEN socket
* option, and the enable member is non-zero, a subsequent connect will use
* pre-shared key (PSK) mode using the provided key.
*/
struct tcp_fastopen {
int enable;
uint8_t psk[TCP_FASTOPEN_PSK_LEN];
};
#endif
#define TCP_FUNCTION_NAME_LEN_MAX 32
struct tcp_function_set {
char function_set_name[TCP_FUNCTION_NAME_LEN_MAX];
uint32_t pcbcnt;
};
/* TLS modes for TCP_TXTLS_MODE */
#define TCP_TLS_MODE_NONE 0
#define TCP_TLS_MODE_SW 1
#define TCP_TLS_MODE_IFNET 2
#define TCP_TLS_MODE_TOE 3
/*
* TCP Control message types
*/
#define TLS_SET_RECORD_TYPE 1
#define TLS_GET_RECORD 2
/*
* TCP specific variables of interest for tp->t_stats stats(9) accounting.
*/
#define VOI_TCP_TXPB 0 /* Transmit payload bytes */
#define VOI_TCP_RETXPB 1 /* Retransmit payload bytes */
#define VOI_TCP_FRWIN 2 /* Foreign receive window */
#define VOI_TCP_LCWIN 3 /* Local congesiton window */
#define VOI_TCP_RTT 4 /* Round trip time */
#define VOI_TCP_CSIG 5 /* Congestion signal */
#define VOI_TCP_GPUT 6 /* Goodput */
#define VOI_TCP_CALCFRWINDIFF 7 /* Congestion avoidance LCWIN - FRWIN */
#define VOI_TCP_GPUT_ND 8 /* Goodput normalised delta */
#define VOI_TCP_ACKLEN 9 /* Average ACKed bytes per ACK */
#define TCP_REUSPORT_LB_NUMA_NODOM (-2) /* remove numa binding */
#define TCP_REUSPORT_LB_NUMA_CURDOM (-1) /* bind to current domain */
#endif /* !_NETINET_TCP_H_ */
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