1139823Simp/*- 210937Swollman * Copyright (c) 1982, 1986, 1993, 1994, 1995 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 4. Neither the name of the University nor the names of its contributors 141541Srgrimes * may be used to endorse or promote products derived from this software 151541Srgrimes * without specific prior written permission. 161541Srgrimes * 171541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271541Srgrimes * SUCH DAMAGE. 281541Srgrimes * 2910937Swollman * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 3050477Speter * $FreeBSD: stable/10/sys/netinet/tcp_var.h 317375 2017-04-24 16:31:28Z smh $ 311541Srgrimes */ 321541Srgrimes 332169Spaul#ifndef _NETINET_TCP_VAR_H_ 342169Spaul#define _NETINET_TCP_VAR_H_ 3586764Sjlemon 3698102Shsu#include <netinet/tcp.h> 3786764Sjlemon 38195699Srwatson#ifdef _KERNEL 39195699Srwatson#include <net/vnet.h> 40191688Szec 411541Srgrimes/* 421541Srgrimes * Kernel variables for tcp. 431541Srgrimes */ 44195699SrwatsonVNET_DECLARE(int, tcp_do_rfc1323); 45207369Sbz#define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323) 46207369Sbz 47195699Srwatson#endif /* _KERNEL */ 48195699Srwatson 4955679Sshin/* TCP segment queue entry */ 5055679Sshinstruct tseg_qent { 5160938Sjake LIST_ENTRY(tseg_qent) tqe_q; 5255679Sshin int tqe_len; /* TCP segment data length */ 5355679Sshin struct tcphdr *tqe_th; /* a pointer to tcp header */ 5455679Sshin struct mbuf *tqe_m; /* mbuf contains packet */ 5555679Sshin}; 5660938SjakeLIST_HEAD(tsegqe_head, tseg_qent); 5755679Sshin 58130989Spsstruct sackblk { 59130989Sps tcp_seq start; /* start seq no. of sack block */ 60131078Sbms tcp_seq end; /* end seq no. */ 61130989Sps}; 62130989Sps 63130989Spsstruct sackhole { 64130989Sps tcp_seq start; /* start seq no. of hole */ 65130989Sps tcp_seq end; /* end seq no. */ 66130989Sps tcp_seq rxmit; /* next seq. no in hole to be retransmitted */ 67145370Sps TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */ 68130989Sps}; 69131078Sbms 70146123Spsstruct sackhint { 71146123Sps struct sackhole *nexthole; 72146123Sps int sack_bytes_rexmit; 73216753Slstewart tcp_seq last_sack_ack; /* Most recent/largest sacked ack */ 74195634Slstewart 75195634Slstewart int ispare; /* explicit pad for 64bit alignment */ 76293709Shiren int sacked_bytes; /* 77293709Shiren * Total sacked bytes reported by the 78293709Shiren * receiver via sack option 79293709Shiren */ 80293709Shiren uint32_t _pad1[1]; /* TBD */ 81293709Shiren uint64_t _pad[1]; /* TBD */ 82146123Sps}; 83146123Sps 8455679Sshinstruct tcptemp { 8555679Sshin u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 8655679Sshin struct tcphdr tt_t; 8755679Sshin}; 8855679Sshin 8955679Sshin#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 9055679Sshin 91169541Sandre/* Neighbor Discovery, Neighbor Unreachability Detection Upper layer hint. */ 92169541Sandre#ifdef INET6 93169541Sandre#define ND6_HINT(tp) \ 94169541Sandredo { \ 95169541Sandre if ((tp) && (tp)->t_inpcb && \ 96169541Sandre ((tp)->t_inpcb->inp_vflag & INP_IPV6) != 0) \ 97169541Sandre nd6_nud_hint(NULL, NULL, 0); \ 98169541Sandre} while (0) 99169541Sandre#else 100169541Sandre#define ND6_HINT(tp) 101169541Sandre#endif 102169541Sandre 1031541Srgrimes/* 1041541Srgrimes * Tcp control block, one per tcp; fields: 10532821Sdg * Organized for 16 byte cacheline efficiency. 1061541Srgrimes */ 1071541Srgrimesstruct tcpcb { 108126193Sandre struct tsegqe_head t_segq; /* segment reassembly queue */ 109195634Slstewart void *t_pspare[2]; /* new reassembly queue */ 110126193Sandre int t_segqlen; /* segment reassembly queue length */ 11132821Sdg int t_dupacks; /* consecutive dup acks recd */ 11232821Sdg 113172309Ssilby struct tcp_timer *t_timers; /* All the TCP timers in one struct */ 11432821Sdg 11532821Sdg struct inpcb *t_inpcb; /* back pointer to internet pcb */ 11611187Swollman int t_state; /* state of this connection */ 11711187Swollman u_int t_flags; 1181541Srgrimes 119191688Szec struct vnet *t_vnet; /* back pointer to parent vnet */ 120191688Szec 1211541Srgrimes tcp_seq snd_una; /* send unacknowledged */ 12232821Sdg tcp_seq snd_max; /* highest sequence number sent; 12332821Sdg * used to recognize retransmits 12432821Sdg */ 1251541Srgrimes tcp_seq snd_nxt; /* send next */ 1261541Srgrimes tcp_seq snd_up; /* send urgent pointer */ 12732821Sdg 1281541Srgrimes tcp_seq snd_wl1; /* window update seg seq number */ 1291541Srgrimes tcp_seq snd_wl2; /* window update seg ack number */ 1301541Srgrimes tcp_seq iss; /* initial send sequence number */ 13132821Sdg tcp_seq irs; /* initial receive sequence number */ 13232821Sdg 13332821Sdg tcp_seq rcv_nxt; /* receive next */ 13432821Sdg tcp_seq rcv_adv; /* advertised window */ 1351541Srgrimes u_long rcv_wnd; /* receive window */ 1361541Srgrimes tcp_seq rcv_up; /* receive urgent pointer */ 13732821Sdg 13832821Sdg u_long snd_wnd; /* send window */ 1391541Srgrimes u_long snd_cwnd; /* congestion-controlled window */ 140212765Sandre u_long snd_spare1; /* unused */ 14113765Smpp u_long snd_ssthresh; /* snd_cwnd size threshold for 1421541Srgrimes * for slow start exponential to 1431541Srgrimes * linear switch 1441541Srgrimes */ 145212765Sandre u_long snd_spare2; /* unused */ 146109175Shsu tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 14760067Sjlemon 14832821Sdg u_int t_maxopd; /* mss plus options */ 14932821Sdg 150194303Sjhb u_int t_rcvtime; /* inactivity time */ 151194303Sjhb u_int t_starttime; /* time connection was established */ 152194303Sjhb u_int t_rtttime; /* RTT measurement start time */ 1531541Srgrimes tcp_seq t_rtseq; /* sequence number being timed */ 15432821Sdg 155212765Sandre u_int t_bw_spare1; /* unused */ 156212765Sandre tcp_seq t_bw_spare2; /* unused */ 157102017Sdillon 15850673Sjlemon int t_rxtcur; /* current retransmit value (ticks) */ 15932821Sdg u_int t_maxseg; /* maximum segment size */ 16011187Swollman int t_srtt; /* smoothed round-trip time */ 16111187Swollman int t_rttvar; /* variance in round-trip time */ 16232821Sdg 16332821Sdg int t_rxtshift; /* log(2) of rexmt exp. backoff */ 16411187Swollman u_int t_rttmin; /* minimum rtt allowed */ 165102017Sdillon u_int t_rttbest; /* best rtt we've seen */ 16632821Sdg u_long t_rttupdated; /* number of times rtt sampled */ 1671541Srgrimes u_long max_sndwnd; /* largest window peer has offered */ 1681541Srgrimes 16932821Sdg int t_softerror; /* possible error not yet reported */ 1701541Srgrimes/* out-of-band data */ 1711541Srgrimes char t_oobflags; /* have some */ 1721541Srgrimes char t_iobc; /* input character */ 1731541Srgrimes/* RFC 1323 variables */ 1741541Srgrimes u_char snd_scale; /* window scaling for send window */ 1751541Srgrimes u_char rcv_scale; /* window scaling for recv window */ 1761541Srgrimes u_char request_r_scale; /* pending window scaling */ 177162277Sandre u_int32_t ts_recent; /* timestamp echo data */ 178194303Sjhb u_int ts_recent_age; /* when last updated */ 179162277Sandre u_int32_t ts_offset; /* our timestamp offset */ 18032821Sdg 1811541Srgrimes tcp_seq last_ack_sent; 18250673Sjlemon/* experimental */ 18350673Sjlemon u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 18450673Sjlemon u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 185117650Shsu tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 186215434Sgnn int t_sndzerowin; /* zero-window updates sent */ 187194303Sjhb u_int t_badrxtwin; /* window for retransmit recovery */ 188112957Shsu u_char snd_limited; /* segments limited transmitted */ 189131078Sbms/* SACK related state */ 190130989Sps int snd_numholes; /* number of holes seen by sender */ 191146953Sps TAILQ_HEAD(sackhole_head, sackhole) snd_holes; 192146953Sps /* SACK scoreboard (sorted) */ 193146630Sps tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/ 194130989Sps int rcv_numsacks; /* # distinct sack blks present */ 195130989Sps struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */ 196136151Sps tcp_seq sack_newdata; /* New data xmitted in this recovery 197136151Sps episode starts at this seq number */ 198146123Sps struct sackhint sackhint; /* SACK scoreboard hint */ 199155767Sandre int t_rttlow; /* smallest observerved RTT */ 200166405Sandre u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */ 201166405Sandre int rfbuf_cnt; /* recv buffer autoscaling byte count */ 202237263Snp struct toedev *tod; /* toedev handling this connection */ 203215434Sgnn int t_sndrexmitpack; /* retransmit packets sent */ 204215434Sgnn int t_rcvoopack; /* out-of-order packets received */ 205174560Skmacy void *t_toe; /* TOE pcb pointer */ 206187289Slstewart int t_bytes_acked; /* # bytes acked during current RTT */ 207215166Slstewart struct cc_algo *cc_algo; /* congestion control algorithm */ 208216760Slstewart struct cc_var *ccv; /* congestion control specific vars */ 209216758Slstewart struct osd *osd; /* storage for Khelp module data */ 210195634Slstewart 211231025Sglebius u_int t_keepinit; /* time to establish connection */ 212231025Sglebius u_int t_keepidle; /* time before keepalive probes begin */ 213231025Sglebius u_int t_keepintvl; /* interval between keepalives */ 214231025Sglebius u_int t_keepcnt; /* number of keepalives before close */ 215231025Sglebius 216274043Shselasky u_int t_tsomax; /* TSO total burst length limit in bytes */ 217273838Ssbruno u_int t_pmtud_saved_maxopd; /* pre-blackhole MSS */ 218273838Ssbruno u_int t_flags2; /* More tcpcb flags storage */ 219251296Sandre 220273838Ssbruno uint32_t t_ispare[6]; /* 5 UTO, 1 TBD */ 221292823Spkelsey#if defined(_KERNEL) && defined(TCP_RFC7413) 222292823Spkelsey void *t_pspare2[3]; /* 1 TCP_SIGNATURE, 2 TBD */ 223292823Spkelsey unsigned int *t_tfo_pending; /* TCP Fast Open pending counter */ 224292823Spkelsey#else 225255759Sbz void *t_pspare2[4]; /* 1 TCP_SIGNATURE, 3 TBD */ 226292823Spkelsey#endif 227292823Spkelsey#if defined(_KERNEL) && defined(TCP_RFC7413) 228292823Spkelsey uint64_t _pad[4]; /* 4 TBD (1-2 CC/RTT?) */ 229292823Spkelsey uint64_t t_tfo_cookie; /* TCP Fast Open cookie */ 230292823Spkelsey#else 231274043Shselasky uint64_t _pad[5]; /* 5 TBD (1-2 CC/RTT?) */ 232292823Spkelsey#endif 233274043Shselasky uint32_t t_tsomaxsegcount; /* TSO maximum segment count */ 234274043Shselasky uint32_t t_tsomaxsegsize; /* TSO maximum segment size in bytes */ 2351541Srgrimes}; 2361541Srgrimes 237185855Srwatson/* 238185855Srwatson * Flags and utility macros for the t_flags field. 239185855Srwatson */ 240185855Srwatson#define TF_ACKNOW 0x000001 /* ack peer immediately */ 241185855Srwatson#define TF_DELACK 0x000002 /* ack, but try to delay it */ 242185855Srwatson#define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 243185855Srwatson#define TF_NOOPT 0x000008 /* don't use tcp options */ 244185855Srwatson#define TF_SENTFIN 0x000010 /* have sent FIN */ 245185855Srwatson#define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 246185855Srwatson#define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 247185855Srwatson#define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 248185855Srwatson#define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 249185855Srwatson#define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 250185855Srwatson#define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 251185855Srwatson#define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 252185855Srwatson#define TF_NOPUSH 0x001000 /* don't push */ 253221209Sjhb#define TF_PREVVALID 0x002000 /* saved values for bad rxmit valid */ 254185855Srwatson#define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 255185855Srwatson#define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 256185855Srwatson#define TF_LASTIDLE 0x040000 /* connection was previously idle */ 257185855Srwatson#define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 258185855Srwatson#define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 259185855Srwatson#define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 260185855Srwatson#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */ 261185855Srwatson#define TF_FORCEDATA 0x800000 /* force out a byte */ 262185855Srwatson#define TF_TSO 0x1000000 /* TSO enabled on this connection */ 263185855Srwatson#define TF_TOE 0x2000000 /* this connection is offloaded */ 264185855Srwatson#define TF_ECN_PERMIT 0x4000000 /* connection ECN-ready */ 265185855Srwatson#define TF_ECN_SND_CWR 0x8000000 /* ECN CWR in queue */ 266185855Srwatson#define TF_ECN_SND_ECE 0x10000000 /* ECN ECE in queue */ 267215166Slstewart#define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */ 268215166Slstewart#define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */ 269292823Spkelsey#define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */ 270185855Srwatson 271215166Slstewart#define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY) 272215166Slstewart#define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY 273215166Slstewart#define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY 274117650Shsu 275215166Slstewart#define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY) 276215166Slstewart#define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY 277215166Slstewart#define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY 278215166Slstewart 279215166Slstewart#define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY)) 280215166Slstewart#define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY) 281215166Slstewart#define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY) 282215166Slstewart 283215166Slstewart#define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una) 284215166Slstewart 285185855Srwatson/* 286185855Srwatson * Flags for the t_oobflags field. 287185855Srwatson */ 288185855Srwatson#define TCPOOB_HAVEDATA 0x01 289185855Srwatson#define TCPOOB_HADDATA 0x02 290185855Srwatson 291125680Sbms#ifdef TCP_SIGNATURE 2926247Swollman/* 293125680Sbms * Defines which are needed by the xform_tcp module and tcp_[in|out]put 294125680Sbms * for SADB verification and lookup. 295125680Sbms */ 296125680Sbms#define TCP_SIGLEN 16 /* length of computed digest in bytes */ 297125680Sbms#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */ 298125680Sbms#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */ 299125680Sbms/* 300125680Sbms * Only a single SA per host may be specified at this time. An SPI is 301125680Sbms * needed in order for the KEY_ALLOCSA() lookup to work. 302125680Sbms */ 303125680Sbms#define TCP_SIG_SPI 0x1000 304125680Sbms#endif /* TCP_SIGNATURE */ 305125680Sbms 306125680Sbms/* 307273838Ssbruno * Flags for PLPMTU handling, t_flags2 308273838Ssbruno */ 309273838Ssbruno#define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */ 310273838Ssbruno#define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */ 311273838Ssbruno#define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */ 312273838Ssbruno 313273838Ssbruno/* 3146247Swollman * Structure to hold TCP options that are only used during segment 3156247Swollman * processing (in tcp_input), but not held in the tcpcb. 3166247Swollman * It's basically used to reduce the number of parameters 317167606Sandre * to tcp_dooptions and tcp_addoptions. 318167606Sandre * The binary order of the to_flags is relevant for packing of the 319167606Sandre * options in tcp_addoptions. 3206247Swollman */ 3216247Swollmanstruct tcpopt { 322195654Slstewart u_int64_t to_flags; /* which options are present */ 323167606Sandre#define TOF_MSS 0x0001 /* maximum segment size */ 324167606Sandre#define TOF_SCALE 0x0002 /* window scaling */ 325178349Sbz#define TOF_SACKPERM 0x0004 /* SACK permitted */ 326167606Sandre#define TOF_TS 0x0010 /* timestamp */ 327178349Sbz#define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */ 328168906Sandre#define TOF_SACK 0x0080 /* Peer sent SACK option */ 329292823Spkelsey#define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */ 330292823Spkelsey#define TOF_MAXOPT 0x0200 331168906Sandre u_int32_t to_tsval; /* new timestamp */ 332167606Sandre u_int32_t to_tsecr; /* reflected timestamp */ 333195654Slstewart u_char *to_sacks; /* pointer to the first SACK blocks */ 334195654Slstewart u_char *to_signature; /* pointer to the TCP-MD5 signature */ 335292823Spkelsey u_char *to_tfo_cookie; /* pointer to the TFO cookie */ 336167606Sandre u_int16_t to_mss; /* maximum segment size */ 337167606Sandre u_int8_t to_wscale; /* window scaling */ 338147637Sps u_int8_t to_nsacks; /* number of SACK blocks */ 339292823Spkelsey u_int8_t to_tfo_len; /* TFO cookie length */ 340224151Sbz u_int32_t to_spare; /* UTO */ 3416247Swollman}; 3426247Swollman 343159949Sandre/* 344159949Sandre * Flags for tcp_dooptions. 345159949Sandre */ 346159949Sandre#define TO_SYN 0x01 /* parse SYN-only options */ 347159949Sandre 348122922Sandrestruct hc_metrics_lite { /* must stay in sync with hc_metrics */ 349122922Sandre u_long rmx_mtu; /* MTU for this path */ 350122922Sandre u_long rmx_ssthresh; /* outbound gateway buffer limit */ 351122922Sandre u_long rmx_rtt; /* estimated round trip time */ 352122922Sandre u_long rmx_rttvar; /* estimated rtt variance */ 353122922Sandre u_long rmx_bandwidth; /* estimated bandwidth */ 354122922Sandre u_long rmx_cwnd; /* congestion window */ 355122922Sandre u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 356122922Sandre u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 357122922Sandre}; 358122922Sandre 359251296Sandre/* 360251296Sandre * Used by tcp_maxmtu() to communicate interface specific features 361251296Sandre * and limits at the time of connection setup. 362251296Sandre */ 363251296Sandrestruct tcp_ifcap { 364251296Sandre int ifcap; 365251296Sandre u_int tsomax; 366274043Shselasky u_int tsomaxsegcount; 367274043Shselasky u_int tsomaxsegsize; 368251296Sandre}; 369251296Sandre 370159725Sandre#ifndef _NETINET_IN_PCB_H_ 371159725Sandrestruct in_conninfo; 372159725Sandre#endif /* _NETINET_IN_PCB_H_ */ 373159725Sandre 374111145Sjlemonstruct tcptw { 375111145Sjlemon struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 376111145Sjlemon tcp_seq snd_nxt; 377111145Sjlemon tcp_seq rcv_nxt; 378121850Ssilby tcp_seq iss; 379121884Ssilby tcp_seq irs; 380111145Sjlemon u_short last_win; /* cached window value */ 381111145Sjlemon u_short tw_so_options; /* copy of so_options */ 382111145Sjlemon struct ucred *tw_cred; /* user credentials */ 383194303Sjhb u_int32_t t_recent; 384169477Sandre u_int32_t ts_offset; /* our timestamp offset */ 385194303Sjhb u_int t_starttime; 386112009Sjlemon int tw_time; 387162111Sru TAILQ_ENTRY(tcptw) tw_2msl; 388255759Sbz void *tw_pspare; /* TCP_SIGNATURE */ 389255759Sbz u_int *tw_spare; /* TCP_SIGNATURE */ 390111145Sjlemon}; 391133874Srwatson 3921541Srgrimes#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 393111145Sjlemon#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 3941541Srgrimes#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 3951541Srgrimes 3961541Srgrimes/* 3971541Srgrimes * The smoothed round-trip time and estimated variance 3981541Srgrimes * are stored as fixed point numbers scaled by the values below. 3991541Srgrimes * For convenience, these scales are also used in smoothing the average 4001541Srgrimes * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 4011541Srgrimes * With these scales, srtt has 3 bits to the right of the binary point, 4021541Srgrimes * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 4031541Srgrimes * binary point, and is smoothed with an ALPHA of 0.75. 4041541Srgrimes */ 40514753Swollman#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 40614753Swollman#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 40714753Swollman#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 40814753Swollman#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 40914753Swollman#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 4101541Srgrimes 4111541Srgrimes/* 4121541Srgrimes * The initial retransmission should happen at rtt + 4 * rttvar. 4131541Srgrimes * Because of the way we do the smoothing, srtt and rttvar 4141541Srgrimes * will each average +1/2 tick of bias. When we compute 4151541Srgrimes * the retransmit timer, we want 1/2 tick of rounding and 4161541Srgrimes * 1 extra tick because of +-1/2 tick uncertainty in the 4171541Srgrimes * firing of the timer. The bias will give us exactly the 4181541Srgrimes * 1.5 tick we need. But, because the bias is 4191541Srgrimes * statistical, we have to test that we don't drop below 4201541Srgrimes * the minimum feasible timer (which is 2 ticks). 42114753Swollman * This version of the macro adapted from a paper by Lawrence 42214753Swollman * Brakmo and Larry Peterson which outlines a problem caused 42314753Swollman * by insufficient precision in the original implementation, 42414753Swollman * which results in inappropriately large RTO values for very 42514753Swollman * fast networks. 4261541Srgrimes */ 4271541Srgrimes#define TCP_REXMTVAL(tp) \ 42835419Sdg max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 42916141Swollman + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 4301541Srgrimes 4311541Srgrimes/* 4321541Srgrimes * TCP statistics. 4331541Srgrimes * Many of these should be kept per connection, 4341541Srgrimes * but that's inconvenient at the moment. 4351541Srgrimes */ 4361541Srgrimesstruct tcpstat { 437249276Sglebius uint64_t tcps_connattempt; /* connections initiated */ 438249276Sglebius uint64_t tcps_accepts; /* connections accepted */ 439249276Sglebius uint64_t tcps_connects; /* connections established */ 440249276Sglebius uint64_t tcps_drops; /* connections dropped */ 441249276Sglebius uint64_t tcps_conndrops; /* embryonic connections dropped */ 442249276Sglebius uint64_t tcps_minmssdrops; /* average minmss too low drops */ 443249276Sglebius uint64_t tcps_closed; /* conn. closed (includes drops) */ 444249276Sglebius uint64_t tcps_segstimed; /* segs where we tried to get rtt */ 445249276Sglebius uint64_t tcps_rttupdated; /* times we succeeded */ 446249276Sglebius uint64_t tcps_delack; /* delayed acks sent */ 447249276Sglebius uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 448249276Sglebius uint64_t tcps_rexmttimeo; /* retransmit timeouts */ 449249276Sglebius uint64_t tcps_persisttimeo; /* persist timeouts */ 450249276Sglebius uint64_t tcps_keeptimeo; /* keepalive timeouts */ 451249276Sglebius uint64_t tcps_keepprobe; /* keepalive probes sent */ 452249276Sglebius uint64_t tcps_keepdrops; /* connections dropped in keepalive */ 4531541Srgrimes 454249276Sglebius uint64_t tcps_sndtotal; /* total packets sent */ 455249276Sglebius uint64_t tcps_sndpack; /* data packets sent */ 456249276Sglebius uint64_t tcps_sndbyte; /* data bytes sent */ 457249276Sglebius uint64_t tcps_sndrexmitpack; /* data packets retransmitted */ 458249276Sglebius uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 459249276Sglebius uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 460249276Sglebius uint64_t tcps_sndacks; /* ack-only packets sent */ 461249276Sglebius uint64_t tcps_sndprobe; /* window probes sent */ 462249276Sglebius uint64_t tcps_sndurg; /* packets sent with URG only */ 463249276Sglebius uint64_t tcps_sndwinup; /* window update-only packets sent */ 464249276Sglebius uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 4651541Srgrimes 466249276Sglebius uint64_t tcps_rcvtotal; /* total packets received */ 467249276Sglebius uint64_t tcps_rcvpack; /* packets received in sequence */ 468249276Sglebius uint64_t tcps_rcvbyte; /* bytes received in sequence */ 469249276Sglebius uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */ 470249276Sglebius uint64_t tcps_rcvbadoff; /* packets received with bad offset */ 471249276Sglebius uint64_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 472249276Sglebius uint64_t tcps_rcvshort; /* packets received too short */ 473249276Sglebius uint64_t tcps_rcvduppack; /* duplicate-only packets received */ 474249276Sglebius uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 475249276Sglebius uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */ 476249276Sglebius uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 477249276Sglebius uint64_t tcps_rcvoopack; /* out-of-order packets received */ 478249276Sglebius uint64_t tcps_rcvoobyte; /* out-of-order bytes received */ 479249276Sglebius uint64_t tcps_rcvpackafterwin; /* packets with data after window */ 480249276Sglebius uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 481249276Sglebius uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */ 482249276Sglebius uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */ 483249276Sglebius uint64_t tcps_rcvdupack; /* rcvd duplicate acks */ 484249276Sglebius uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 485249276Sglebius uint64_t tcps_rcvackpack; /* rcvd ack packets */ 486249276Sglebius uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 487249276Sglebius uint64_t tcps_rcvwinupd; /* rcvd window update packets */ 488249276Sglebius uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */ 489249276Sglebius uint64_t tcps_predack; /* times hdr predict ok for acks */ 490249276Sglebius uint64_t tcps_preddat; /* times hdr predict ok for data pkts */ 491249276Sglebius uint64_t tcps_pcbcachemiss; 492249276Sglebius uint64_t tcps_cachedrtt; /* times cached RTT in route updated */ 493249276Sglebius uint64_t tcps_cachedrttvar; /* times cached rttvar updated */ 494249276Sglebius uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */ 495249276Sglebius uint64_t tcps_usedrtt; /* times RTT initialized from route */ 496249276Sglebius uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */ 497249276Sglebius uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/ 498249276Sglebius uint64_t tcps_persistdrop; /* timeout in persist state */ 499249276Sglebius uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 500249276Sglebius uint64_t tcps_mturesent; /* resends due to MTU discovery */ 501249276Sglebius uint64_t tcps_listendrop; /* listen queue overflows */ 502249276Sglebius uint64_t tcps_badrst; /* ignored RSTs in the window */ 50386764Sjlemon 504249276Sglebius uint64_t tcps_sc_added; /* entry added to syncache */ 505249276Sglebius uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */ 506249276Sglebius uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */ 507249276Sglebius uint64_t tcps_sc_dropped; /* could not reply to packet */ 508249276Sglebius uint64_t tcps_sc_completed; /* successful extraction of entry */ 509249276Sglebius uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */ 510249276Sglebius uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */ 511249276Sglebius uint64_t tcps_sc_reset; /* RST removed entry from syncache */ 512249276Sglebius uint64_t tcps_sc_stale; /* timed out or listen socket gone */ 513249276Sglebius uint64_t tcps_sc_aborted; /* syncache entry aborted */ 514249276Sglebius uint64_t tcps_sc_badack; /* removed due to bad ACK */ 515249276Sglebius uint64_t tcps_sc_unreach; /* ICMP unreachable received */ 516249276Sglebius uint64_t tcps_sc_zonefail; /* zalloc() failed */ 517249276Sglebius uint64_t tcps_sc_sendcookie; /* SYN cookie sent */ 518249276Sglebius uint64_t tcps_sc_recvcookie; /* SYN cookie received */ 519122922Sandre 520249276Sglebius uint64_t tcps_hc_added; /* entry added to hostcache */ 521249276Sglebius uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */ 522130989Sps 523249276Sglebius uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */ 524167036Smohans 525130989Sps /* SACK related stats */ 526249276Sglebius uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */ 527249276Sglebius uint64_t tcps_sack_rexmits; /* SACK rexmit segments */ 528249276Sglebius uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */ 529249276Sglebius uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */ 530249276Sglebius uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */ 531249276Sglebius uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */ 532181056Srpaulo 533181056Srpaulo /* ECN related stats */ 534249276Sglebius uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */ 535249276Sglebius uint64_t tcps_ecn_ect0; /* ECN Capable Transport */ 536249276Sglebius uint64_t tcps_ecn_ect1; /* ECN Capable Transport */ 537249276Sglebius uint64_t tcps_ecn_shs; /* ECN successful handshakes */ 538249276Sglebius uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */ 539195634Slstewart 540221023Sattilio /* TCP_SIGNATURE related stats */ 541249276Sglebius uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */ 542249276Sglebius uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */ 543249276Sglebius uint64_t tcps_sig_err_buildsig; /* Mismatching signature received */ 544249276Sglebius uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */ 545249276Sglebius uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */ 546221023Sattilio 547249276Sglebius uint64_t _pad[12]; /* 6 UTO, 6 TBD */ 5481541Srgrimes}; 5491541Srgrimes 550190978Srwatson#ifdef _KERNEL 551249276Sglebius#include <sys/counter.h> 552249276Sglebius 553253083SaeVNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */ 554196039Srwatson/* 555196039Srwatson * In-kernel consumers can use these accessor macros directly to update 556196039Srwatson * stats. 557196039Srwatson */ 558253083Sae#define TCPSTAT_ADD(name, val) \ 559253083Sae VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val)) 560190948Srwatson#define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1) 561196039Srwatson 562196039Srwatson/* 563196039Srwatson * Kernel module consumers must use this accessor macro. 564196039Srwatson */ 565196039Srwatsonvoid kmod_tcpstat_inc(int statnum); 566196039Srwatson#define KMOD_TCPSTAT_INC(name) \ 567253083Sae kmod_tcpstat_inc(offsetof(struct tcpstat, name) / sizeof(uint64_t)) 568216758Slstewart 569216758Slstewart/* 570216758Slstewart * TCP specific helper hook point identifiers. 571216758Slstewart */ 572216758Slstewart#define HHOOK_TCP_EST_IN 0 573216758Slstewart#define HHOOK_TCP_EST_OUT 1 574216758Slstewart#define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT 575216758Slstewart 576216758Slstewartstruct tcp_hhook_data { 577217252Slstewart struct tcpcb *tp; 578217252Slstewart struct tcphdr *th; 579217252Slstewart struct tcpopt *to; 580217252Slstewart long len; 581217252Slstewart int tso; 582217252Slstewart tcp_seq curack; 583216758Slstewart}; 584190978Srwatson#endif 585190948Srwatson 5866247Swollman/* 58736079Swollman * TCB structure exported to user-land via sysctl(3). 58837183Sjhay * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 58937183Sjhay * included. Not all of our clients do. 59036079Swollman */ 59137183Sjhay#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 592197244Ssilbystruct xtcp_timer { 593197244Ssilby int tt_rexmt; /* retransmit timer */ 594197244Ssilby int tt_persist; /* retransmit persistence */ 595197244Ssilby int tt_keep; /* keepalive */ 596197244Ssilby int tt_2msl; /* 2*msl TIME_WAIT timer */ 597197244Ssilby int tt_delack; /* delayed ACK timer */ 598217126Sjhb int t_rcvtime; /* Time since last packet received */ 599197244Ssilby}; 60036079Swollmanstruct xtcpcb { 60136079Swollman size_t xt_len; 60236079Swollman struct inpcb xt_inp; 60336079Swollman struct tcpcb xt_tp; 60436079Swollman struct xsocket xt_socket; 605197244Ssilby struct xtcp_timer xt_timer; 60636079Swollman u_quad_t xt_alignment_hack; 60736079Swollman}; 60836079Swollman#endif 60936079Swollman 61036079Swollman/* 6116247Swollman * Names for TCP sysctl objects 6126247Swollman */ 6136247Swollman#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 6146247Swollman#define TCPCTL_MSSDFLT 3 /* MSS default */ 6156472Swollman#define TCPCTL_STATS 4 /* statistics (read-only) */ 6166472Swollman#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 6176472Swollman#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 6186472Swollman#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 61918281Spst#define TCPCTL_SENDSPACE 8 /* send buffer space */ 62018281Spst#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 62163431Ssheldonh#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 62236079Swollman#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 62350673Sjlemon#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 62452904Sshin#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 625130989Sps#define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */ 626141381Smaxim#define TCPCTL_DROP 15 /* drop tcp connection */ 627141381Smaxim#define TCPCTL_MAXID 16 628167036Smohans#define TCPCTL_FINWAIT2_TIMEOUT 17 6296247Swollman 63055205Speter#ifdef _KERNEL 63144078Sdfr#ifdef SYSCTL_DECL 63244078SdfrSYSCTL_DECL(_net_inet_tcp); 633136151SpsSYSCTL_DECL(_net_inet_tcp_sack); 634169683SandreMALLOC_DECLARE(M_TCPLOG); 63544078Sdfr#endif 63644078Sdfr 637195699SrwatsonVNET_DECLARE(struct inpcbhead, tcb); /* queue of active tcpcb's */ 638195699SrwatsonVNET_DECLARE(struct inpcbinfo, tcbinfo); 639207369Sbzextern int tcp_log_in_vain; 640195699SrwatsonVNET_DECLARE(int, tcp_mssdflt); /* XXX */ 641195699SrwatsonVNET_DECLARE(int, tcp_minmss); 642195699SrwatsonVNET_DECLARE(int, tcp_delack_enabled); 643211464SandreVNET_DECLARE(int, tcp_do_rfc3390); 644242266SandreVNET_DECLARE(int, tcp_do_initcwnd10); 645226437SandreVNET_DECLARE(int, tcp_sendspace); 646226437SandreVNET_DECLARE(int, tcp_recvspace); 647195699SrwatsonVNET_DECLARE(int, path_mtu_discovery); 648215166SlstewartVNET_DECLARE(int, tcp_do_rfc3465); 649215166SlstewartVNET_DECLARE(int, tcp_abc_l_var); 650195727Srwatson#define V_tcb VNET(tcb) 651195727Srwatson#define V_tcbinfo VNET(tcbinfo) 652195727Srwatson#define V_tcp_mssdflt VNET(tcp_mssdflt) 653195727Srwatson#define V_tcp_minmss VNET(tcp_minmss) 654195727Srwatson#define V_tcp_delack_enabled VNET(tcp_delack_enabled) 655211464Sandre#define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390) 656242266Sandre#define V_tcp_do_initcwnd10 VNET(tcp_do_initcwnd10) 657226437Sandre#define V_tcp_sendspace VNET(tcp_sendspace) 658226437Sandre#define V_tcp_recvspace VNET(tcp_recvspace) 659195727Srwatson#define V_path_mtu_discovery VNET(path_mtu_discovery) 660215166Slstewart#define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465) 661215166Slstewart#define V_tcp_abc_l_var VNET(tcp_abc_l_var) 662185088Szec 663195699SrwatsonVNET_DECLARE(int, tcp_do_sack); /* SACK enabled/disabled */ 664195699SrwatsonVNET_DECLARE(int, tcp_sc_rst_sock_fail); /* RST on sock alloc failure */ 665207369Sbz#define V_tcp_do_sack VNET(tcp_do_sack) 666207369Sbz#define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail) 667207369Sbz 668195699SrwatsonVNET_DECLARE(int, tcp_do_ecn); /* TCP ECN enabled/disabled */ 669195699SrwatsonVNET_DECLARE(int, tcp_ecn_maxretries); 670195727Srwatson#define V_tcp_do_ecn VNET(tcp_do_ecn) 671195727Srwatson#define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries) 672195699Srwatson 673217252SlstewartVNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]); 674216758Slstewart#define V_tcp_hhh VNET(tcp_hhh) 675216758Slstewart 676293709ShirenVNET_DECLARE(int, tcp_do_rfc6675_pipe); 677293709Shiren#define V_tcp_do_rfc6675_pipe VNET(tcp_do_rfc6675_pipe) 678293709Shiren 679167606Sandreint tcp_addoptions(struct tcpopt *, u_char *); 680215392Slstewartint tcp_ccalgounload(struct cc_algo *unload_algo); 6811541Srgrimesstruct tcpcb * 68292723Salfred tcp_close(struct tcpcb *); 683157376Srwatsonvoid tcp_discardcb(struct tcpcb *); 684111145Sjlemonvoid tcp_twstart(struct tcpcb *); 685162064Sglebius#if 0 686121850Ssilbyint tcp_twrecycleable(struct tcptw *tw); 687162064Sglebius#endif 688275402Sjchvoid tcp_twclose(struct tcptw *, int); 68992723Salfredvoid tcp_ctlinput(int, struct sockaddr *, void *); 69092723Salfredint tcp_ctloutput(struct socket *, struct sockopt *); 6911541Srgrimesstruct tcpcb * 69292723Salfred tcp_drop(struct tcpcb *, int); 69392723Salfredvoid tcp_drain(void); 69492723Salfredvoid tcp_init(void); 695193731Szec#ifdef VIMAGE 696193731Szecvoid tcp_destroy(void); 697193731Szec#endif 698128452Ssilbyvoid tcp_fini(void *); 699217126Sjhbchar *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *, 700171229Speter const void *); 701211462Sandrechar *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *, 702211462Sandre const void *); 703169541Sandreint tcp_reass(struct tcpcb *, struct tcphdr *, int *, struct mbuf *); 704285976Sdelphijvoid tcp_reass_global_init(void); 705213158Slstewartvoid tcp_reass_flush(struct tcpcb *); 70692723Salfredvoid tcp_input(struct mbuf *, int); 707317375Ssmhint tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *, 708317375Ssmh struct tcpcb *, int); 709251296Sandreu_long tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *); 710251296Sandreu_long tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *); 711234342Sglebiusvoid tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *, 712251296Sandre struct tcp_ifcap *); 71392723Salfredvoid tcp_mss(struct tcpcb *, int); 714122922Sandreint tcp_mssopt(struct in_conninfo *); 715133874Srwatsonstruct inpcb * 71698211Shsu tcp_drop_syn_sent(struct inpcb *, int); 71798211Shsustruct inpcb * 71898211Shsu tcp_mtudisc(struct inpcb *, int); 7191541Srgrimesstruct tcpcb * 72092723Salfred tcp_newtcpcb(struct inpcb *); 72192723Salfredint tcp_output(struct tcpcb *); 722254889Smarkjvoid tcp_state_change(struct tcpcb *, int); 72392723Salfredvoid tcp_respond(struct tcpcb *, void *, 72492723Salfred struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 725169541Sandrevoid tcp_tw_init(void); 726193731Szec#ifdef VIMAGE 727193731Szecvoid tcp_tw_destroy(void); 728193731Szec#endif 729169541Sandrevoid tcp_tw_zone_change(void); 730169608Sandreint tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *, 731169608Sandre struct mbuf *, int); 73292723Salfredvoid tcp_setpersist(struct tcpcb *); 733125783Sbms#ifdef TCP_SIGNATURE 734125783Sbmsint tcp_signature_compute(struct mbuf *, int, int, int, u_char *, u_int); 735221023Sattilioint tcp_signature_verify(struct mbuf *, int, int, int, struct tcpopt *, 736221023Sattilio struct tcphdr *, u_int); 737125783Sbms#endif 73892723Salfredvoid tcp_slowtimo(void); 73955679Sshinstruct tcptemp * 740111144Sjlemon tcpip_maketemplate(struct inpcb *); 741111144Sjlemonvoid tcpip_fillheaders(struct inpcb *, void *, void *); 742282964Sjchvoid tcp_timer_activate(struct tcpcb *, uint32_t, u_int); 743282964Sjchint tcp_timer_active(struct tcpcb *, uint32_t); 744282964Sjchvoid tcp_timer_stop(struct tcpcb *, uint32_t); 745169272Srwatsonvoid tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int); 746122922Sandre/* 747122922Sandre * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo) 748122922Sandre */ 749122922Sandrevoid tcp_hc_init(void); 750193731Szec#ifdef VIMAGE 751193731Szecvoid tcp_hc_destroy(void); 752193731Szec#endif 753122922Sandrevoid tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *); 754122922Sandreu_long tcp_hc_getmtu(struct in_conninfo *); 755122922Sandrevoid tcp_hc_updatemtu(struct in_conninfo *, u_long); 756122922Sandrevoid tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *); 7579470Swollman 75817096Swollmanextern struct pr_usrreqs tcp_usrreqs; 75992723Salfredtcp_seq tcp_new_isn(struct tcpcb *); 7609470Swollman 761293710Shirenint tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq); 762142031Spsvoid tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend); 763130989Spsvoid tcp_clean_sackreport(struct tcpcb *tp); 764130989Spsvoid tcp_sack_adjust(struct tcpcb *tp); 765136151Spsstruct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt); 766130989Spsvoid tcp_sack_partialack(struct tcpcb *, struct tcphdr *); 767130989Spsvoid tcp_free_sackholes(struct tcpcb *tp); 768130989Spsint tcp_newreno(struct tcpcb *, struct tcphdr *); 769293709Shirenint tcp_compute_pipe(struct tcpcb *); 770130989Sps 771215166Slstewartvoid cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type); 772215166Slstewart 773270051Sbzstatic inline void 774270051Sbztcp_fields_to_host(struct tcphdr *th) 775270051Sbz{ 776270051Sbz 777270051Sbz th->th_seq = ntohl(th->th_seq); 778270051Sbz th->th_ack = ntohl(th->th_ack); 779270051Sbz th->th_win = ntohs(th->th_win); 780270051Sbz th->th_urp = ntohs(th->th_urp); 781270051Sbz} 782270051Sbz 783270051Sbz#ifdef TCP_SIGNATURE 784270051Sbzstatic inline void 785270051Sbztcp_fields_to_net(struct tcphdr *th) 786270051Sbz{ 787270051Sbz 788270051Sbz th->th_seq = htonl(th->th_seq); 789270051Sbz th->th_ack = htonl(th->th_ack); 790270051Sbz th->th_win = htons(th->th_win); 791270051Sbz th->th_urp = htons(th->th_urp); 792270051Sbz} 793270051Sbz#endif 79455205Speter#endif /* _KERNEL */ 7952169Spaul 7966348Swollman#endif /* _NETINET_TCP_VAR_H_ */ 797