tcp_var.h revision 111145
1/* 2 * Copyright (c) 1982, 1986, 1993, 1994, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 34 * $FreeBSD: head/sys/netinet/tcp_var.h 111145 2003-02-19 22:32:43Z jlemon $ 35 */ 36 37#ifndef _NETINET_TCP_VAR_H_ 38#define _NETINET_TCP_VAR_H_ 39 40#include <netinet/in_pcb.h> /* needed for in_conninfo, inp_gen_t */ 41#include <netinet/tcp.h> 42 43/* 44 * Kernel variables for tcp. 45 */ 46extern int tcp_do_rfc1323; 47extern int tcp_do_rfc1644; 48 49/* TCP segment queue entry */ 50struct tseg_qent { 51 LIST_ENTRY(tseg_qent) tqe_q; 52 int tqe_len; /* TCP segment data length */ 53 struct tcphdr *tqe_th; /* a pointer to tcp header */ 54 struct mbuf *tqe_m; /* mbuf contains packet */ 55}; 56LIST_HEAD(tsegqe_head, tseg_qent); 57#ifdef MALLOC_DECLARE 58MALLOC_DECLARE(M_TSEGQ); 59#endif 60 61struct tcptemp { 62 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */ 63 struct tcphdr tt_t; 64}; 65 66#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */ 67 68/* 69 * Tcp control block, one per tcp; fields: 70 * Organized for 16 byte cacheline efficiency. 71 */ 72struct tcpcb { 73 struct tsegqe_head t_segq; 74 int t_dupacks; /* consecutive dup acks recd */ 75 struct tcptemp *unused; /* unused */ 76 77 struct callout *tt_rexmt; /* retransmit timer */ 78 struct callout *tt_persist; /* retransmit persistence */ 79 struct callout *tt_keep; /* keepalive */ 80 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 81 struct callout *tt_delack; /* delayed ACK timer */ 82 83 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 84 int t_state; /* state of this connection */ 85 u_int t_flags; 86#define TF_ACKNOW 0x00001 /* ack peer immediately */ 87#define TF_DELACK 0x00002 /* ack, but try to delay it */ 88#define TF_NODELAY 0x00004 /* don't delay packets to coalesce */ 89#define TF_NOOPT 0x00008 /* don't use tcp options */ 90#define TF_SENTFIN 0x00010 /* have sent FIN */ 91#define TF_REQ_SCALE 0x00020 /* have/will request window scaling */ 92#define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */ 93#define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */ 94#define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */ 95#define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */ 96#define TF_NEEDSYN 0x00400 /* send SYN (implicit state) */ 97#define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */ 98#define TF_NOPUSH 0x01000 /* don't push */ 99#define TF_REQ_CC 0x02000 /* have/will request CC */ 100#define TF_RCVD_CC 0x04000 /* a CC was received in SYN */ 101#define TF_SENDCCNEW 0x08000 /* send CCnew instead of CC in SYN */ 102#define TF_MORETOCOME 0x10000 /* More data to be appended to sock */ 103#define TF_LQ_OVERFLOW 0x20000 /* listen queue overflow */ 104#define TF_LASTIDLE 0x40000 /* connection was previously idle */ 105#define TF_RXWIN0SENT 0x80000 /* sent a receiver win 0 in response */ 106 int t_force; /* 1 if forcing out a byte */ 107 108 tcp_seq snd_una; /* send unacknowledged */ 109 tcp_seq snd_max; /* highest sequence number sent; 110 * used to recognize retransmits 111 */ 112 tcp_seq snd_nxt; /* send next */ 113 tcp_seq snd_up; /* send urgent pointer */ 114 115 tcp_seq snd_wl1; /* window update seg seq number */ 116 tcp_seq snd_wl2; /* window update seg ack number */ 117 tcp_seq iss; /* initial send sequence number */ 118 tcp_seq irs; /* initial receive sequence number */ 119 120 tcp_seq rcv_nxt; /* receive next */ 121 tcp_seq rcv_adv; /* advertised window */ 122 u_long rcv_wnd; /* receive window */ 123 tcp_seq rcv_up; /* receive urgent pointer */ 124 125 u_long snd_wnd; /* send window */ 126 u_long snd_cwnd; /* congestion-controlled window */ 127 u_long snd_bwnd; /* bandwidth-controlled window */ 128 u_long snd_ssthresh; /* snd_cwnd size threshold for 129 * for slow start exponential to 130 * linear switch 131 */ 132 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 133 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */ 134 tcp_seq snd_high; /* for use in NewReno Fast Recovery */ 135 136 u_int t_maxopd; /* mss plus options */ 137 138 u_long t_rcvtime; /* inactivity time */ 139 u_long t_starttime; /* time connection was established */ 140 int t_rtttime; /* round trip time */ 141 tcp_seq t_rtseq; /* sequence number being timed */ 142 143 int t_bw_rtttime; /* used for bandwidth calculation */ 144 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 145 146 int t_rxtcur; /* current retransmit value (ticks) */ 147 u_int t_maxseg; /* maximum segment size */ 148 int t_srtt; /* smoothed round-trip time */ 149 int t_rttvar; /* variance in round-trip time */ 150 151 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 152 u_int t_rttmin; /* minimum rtt allowed */ 153 u_int t_rttbest; /* best rtt we've seen */ 154 u_long t_rttupdated; /* number of times rtt sampled */ 155 u_long max_sndwnd; /* largest window peer has offered */ 156 157 int t_softerror; /* possible error not yet reported */ 158/* out-of-band data */ 159 char t_oobflags; /* have some */ 160 char t_iobc; /* input character */ 161#define TCPOOB_HAVEDATA 0x01 162#define TCPOOB_HADDATA 0x02 163/* RFC 1323 variables */ 164 u_char snd_scale; /* window scaling for send window */ 165 u_char rcv_scale; /* window scaling for recv window */ 166 u_char request_r_scale; /* pending window scaling */ 167 u_char requested_s_scale; 168 u_long ts_recent; /* timestamp echo data */ 169 170 u_long ts_recent_age; /* when last updated */ 171 tcp_seq last_ack_sent; 172/* RFC 1644 variables */ 173 tcp_cc cc_send; /* send connection count */ 174 tcp_cc cc_recv; /* receive connection count */ 175/* experimental */ 176 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 177 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 178 tcp_seq snd_high_prev; /* snd_high prior to retransmit */ 179 u_long t_badrxtwin; /* window for retransmit recovery */ 180}; 181 182/* 183 * Structure to hold TCP options that are only used during segment 184 * processing (in tcp_input), but not held in the tcpcb. 185 * It's basically used to reduce the number of parameters 186 * to tcp_dooptions. 187 */ 188struct tcpopt { 189 u_long to_flags; /* which options are present */ 190#define TOF_TS 0x0001 /* timestamp */ 191#define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 192#define TOF_CCNEW 0x0004 193#define TOF_CCECHO 0x0008 194#define TOF_MSS 0x0010 195#define TOF_SCALE 0x0020 196 u_int32_t to_tsval; 197 u_int32_t to_tsecr; 198 tcp_cc to_cc; /* holds CC or CCnew */ 199 tcp_cc to_ccecho; 200 u_int16_t to_mss; 201 u_int8_t to_requested_s_scale; 202 u_int8_t to_pad; 203}; 204 205struct syncache { 206 inp_gen_t sc_inp_gencnt; /* pointer check */ 207 struct tcpcb *sc_tp; /* tcb for listening socket */ 208 struct mbuf *sc_ipopts; /* source route */ 209 struct in_conninfo sc_inc; /* addresses */ 210#define sc_route sc_inc.inc_route 211#define sc_route6 sc_inc.inc6_route 212 u_int32_t sc_tsrecent; 213 tcp_cc sc_cc_send; /* holds CC or CCnew */ 214 tcp_cc sc_cc_recv; 215 tcp_seq sc_irs; /* seq from peer */ 216 tcp_seq sc_iss; /* our ISS */ 217 u_long sc_rxttime; /* retransmit time */ 218 u_int16_t sc_rxtslot; /* retransmit counter */ 219 u_int16_t sc_peer_mss; /* peer's MSS */ 220 u_int16_t sc_wnd; /* advertised window */ 221 u_int8_t sc_requested_s_scale:4, 222 sc_request_r_scale:4; 223 u_int8_t sc_flags; 224#define SCF_NOOPT 0x01 /* no TCP options */ 225#define SCF_WINSCALE 0x02 /* negotiated window scaling */ 226#define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 227#define SCF_CC 0x08 /* negotiated CC */ 228#define SCF_UNREACH 0x10 /* icmp unreachable received */ 229#define SCF_KEEPROUTE 0x20 /* keep cloned route */ 230 TAILQ_ENTRY(syncache) sc_hash; 231 TAILQ_ENTRY(syncache) sc_timerq; 232}; 233 234struct syncache_head { 235 TAILQ_HEAD(, syncache) sch_bucket; 236 u_int sch_length; 237}; 238 239struct tcptw { 240 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */ 241 tcp_seq snd_nxt; 242 tcp_seq rcv_nxt; 243 tcp_cc cc_recv; 244 tcp_cc cc_send; 245 u_short last_win; /* cached window value */ 246 u_short tw_so_options; /* copy of so_options */ 247 struct ucred *tw_cred; /* user credentials */ 248 u_long t_recent; 249 u_long t_starttime; 250 struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */ 251}; 252 253/* 254 * The TAO cache entry which is stored in the protocol family specific 255 * portion of the route metrics. 256 */ 257struct rmxp_tao { 258 tcp_cc tao_cc; /* latest CC in valid SYN */ 259 tcp_cc tao_ccsent; /* latest CC sent to peer */ 260 u_short tao_mssopt; /* peer's cached MSS */ 261#ifdef notyet 262 u_short tao_flags; /* cache status flags */ 263#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 264#define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 265#define TAOF_UNDEF 0 /* we don't know yet */ 266#endif /* notyet */ 267}; 268#define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 269 270#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 271#define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb) 272#define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 273 274/* 275 * The smoothed round-trip time and estimated variance 276 * are stored as fixed point numbers scaled by the values below. 277 * For convenience, these scales are also used in smoothing the average 278 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 279 * With these scales, srtt has 3 bits to the right of the binary point, 280 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 281 * binary point, and is smoothed with an ALPHA of 0.75. 282 */ 283#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 284#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 285#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 286#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 287#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 288 289/* 290 * The initial retransmission should happen at rtt + 4 * rttvar. 291 * Because of the way we do the smoothing, srtt and rttvar 292 * will each average +1/2 tick of bias. When we compute 293 * the retransmit timer, we want 1/2 tick of rounding and 294 * 1 extra tick because of +-1/2 tick uncertainty in the 295 * firing of the timer. The bias will give us exactly the 296 * 1.5 tick we need. But, because the bias is 297 * statistical, we have to test that we don't drop below 298 * the minimum feasible timer (which is 2 ticks). 299 * This version of the macro adapted from a paper by Lawrence 300 * Brakmo and Larry Peterson which outlines a problem caused 301 * by insufficient precision in the original implementation, 302 * which results in inappropriately large RTO values for very 303 * fast networks. 304 */ 305#define TCP_REXMTVAL(tp) \ 306 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 307 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 308 309/* 310 * TCP statistics. 311 * Many of these should be kept per connection, 312 * but that's inconvenient at the moment. 313 */ 314struct tcpstat { 315 u_long tcps_connattempt; /* connections initiated */ 316 u_long tcps_accepts; /* connections accepted */ 317 u_long tcps_connects; /* connections established */ 318 u_long tcps_drops; /* connections dropped */ 319 u_long tcps_conndrops; /* embryonic connections dropped */ 320 u_long tcps_closed; /* conn. closed (includes drops) */ 321 u_long tcps_segstimed; /* segs where we tried to get rtt */ 322 u_long tcps_rttupdated; /* times we succeeded */ 323 u_long tcps_delack; /* delayed acks sent */ 324 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 325 u_long tcps_rexmttimeo; /* retransmit timeouts */ 326 u_long tcps_persisttimeo; /* persist timeouts */ 327 u_long tcps_keeptimeo; /* keepalive timeouts */ 328 u_long tcps_keepprobe; /* keepalive probes sent */ 329 u_long tcps_keepdrops; /* connections dropped in keepalive */ 330 331 u_long tcps_sndtotal; /* total packets sent */ 332 u_long tcps_sndpack; /* data packets sent */ 333 u_long tcps_sndbyte; /* data bytes sent */ 334 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 335 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 336 u_long tcps_sndrexmitbad; /* unnecessary packet retransmissions */ 337 u_long tcps_sndacks; /* ack-only packets sent */ 338 u_long tcps_sndprobe; /* window probes sent */ 339 u_long tcps_sndurg; /* packets sent with URG only */ 340 u_long tcps_sndwinup; /* window update-only packets sent */ 341 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 342 343 u_long tcps_rcvtotal; /* total packets received */ 344 u_long tcps_rcvpack; /* packets received in sequence */ 345 u_long tcps_rcvbyte; /* bytes received in sequence */ 346 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 347 u_long tcps_rcvbadoff; /* packets received with bad offset */ 348 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 349 u_long tcps_rcvshort; /* packets received too short */ 350 u_long tcps_rcvduppack; /* duplicate-only packets received */ 351 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 352 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 353 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 354 u_long tcps_rcvoopack; /* out-of-order packets received */ 355 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 356 u_long tcps_rcvpackafterwin; /* packets with data after window */ 357 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 358 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 359 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 360 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 361 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 362 u_long tcps_rcvackpack; /* rcvd ack packets */ 363 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 364 u_long tcps_rcvwinupd; /* rcvd window update packets */ 365 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 366 u_long tcps_predack; /* times hdr predict ok for acks */ 367 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 368 u_long tcps_pcbcachemiss; 369 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 370 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 371 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 372 u_long tcps_usedrtt; /* times RTT initialized from route */ 373 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 374 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 375 u_long tcps_persistdrop; /* timeout in persist state */ 376 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 377 u_long tcps_mturesent; /* resends due to MTU discovery */ 378 u_long tcps_listendrop; /* listen queue overflows */ 379 380 u_long tcps_sc_added; /* entry added to syncache */ 381 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 382 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 383 u_long tcps_sc_dropped; /* could not reply to packet */ 384 u_long tcps_sc_completed; /* successful extraction of entry */ 385 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 386 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 387 u_long tcps_sc_reset; /* RST removed entry from syncache */ 388 u_long tcps_sc_stale; /* timed out or listen socket gone */ 389 u_long tcps_sc_aborted; /* syncache entry aborted */ 390 u_long tcps_sc_badack; /* removed due to bad ACK */ 391 u_long tcps_sc_unreach; /* ICMP unreachable received */ 392 u_long tcps_sc_zonefail; /* zalloc() failed */ 393 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 394 u_long tcps_sc_recvcookie; /* SYN cookie received */ 395}; 396 397/* 398 * TCB structure exported to user-land via sysctl(3). 399 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 400 * included. Not all of our clients do. 401 */ 402#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 403struct xtcpcb { 404 size_t xt_len; 405 struct inpcb xt_inp; 406 struct tcpcb xt_tp; 407 struct xsocket xt_socket; 408 u_quad_t xt_alignment_hack; 409}; 410#endif 411 412/* 413 * Names for TCP sysctl objects 414 */ 415#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 416#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 417#define TCPCTL_MSSDFLT 3 /* MSS default */ 418#define TCPCTL_STATS 4 /* statistics (read-only) */ 419#define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 420#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 421#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 422#define TCPCTL_SENDSPACE 8 /* send buffer space */ 423#define TCPCTL_RECVSPACE 9 /* receive buffer space */ 424#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 425#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 426#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 427#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 428#define TCPCTL_MAXID 14 429 430#define TCPCTL_NAMES { \ 431 { 0, 0 }, \ 432 { "rfc1323", CTLTYPE_INT }, \ 433 { "rfc1644", CTLTYPE_INT }, \ 434 { "mssdflt", CTLTYPE_INT }, \ 435 { "stats", CTLTYPE_STRUCT }, \ 436 { "rttdflt", CTLTYPE_INT }, \ 437 { "keepidle", CTLTYPE_INT }, \ 438 { "keepintvl", CTLTYPE_INT }, \ 439 { "sendspace", CTLTYPE_INT }, \ 440 { "recvspace", CTLTYPE_INT }, \ 441 { "keepinit", CTLTYPE_INT }, \ 442 { "pcblist", CTLTYPE_STRUCT }, \ 443 { "delacktime", CTLTYPE_INT }, \ 444 { "v6mssdflt", CTLTYPE_INT }, \ 445} 446 447 448#ifdef _KERNEL 449#ifdef SYSCTL_DECL 450SYSCTL_DECL(_net_inet_tcp); 451#endif 452 453extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 454extern struct inpcbinfo tcbinfo; 455extern struct tcpstat tcpstat; /* tcp statistics */ 456extern int tcp_mssdflt; /* XXX */ 457extern int tcp_delack_enabled; 458extern int tcp_do_newreno; 459extern int path_mtu_discovery; 460extern int ss_fltsz; 461extern int ss_fltsz_local; 462 463void tcp_canceltimers(struct tcpcb *); 464struct tcpcb * 465 tcp_close(struct tcpcb *); 466void tcp_twstart(struct tcpcb *); 467void tcp_twclose(struct tcptw *); 468void tcp_ctlinput(int, struct sockaddr *, void *); 469int tcp_ctloutput(struct socket *, struct sockopt *); 470struct tcpcb * 471 tcp_drop(struct tcpcb *, int); 472void tcp_drain(void); 473void tcp_fasttimo(void); 474struct rmxp_tao * 475 tcp_gettaocache(struct in_conninfo *); 476void tcp_init(void); 477void tcp_input(struct mbuf *, int); 478void tcp_mss(struct tcpcb *, int); 479int tcp_mssopt(struct tcpcb *); 480struct inpcb * 481 tcp_drop_syn_sent(struct inpcb *, int); 482struct inpcb * 483 tcp_mtudisc(struct inpcb *, int); 484struct tcpcb * 485 tcp_newtcpcb(struct inpcb *); 486int tcp_output(struct tcpcb *); 487struct inpcb * 488 tcp_quench(struct inpcb *, int); 489void tcp_respond(struct tcpcb *, void *, 490 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 491int tcp_twrespond(struct tcptw *, int); 492struct rtentry * 493 tcp_rtlookup(struct in_conninfo *); 494void tcp_setpersist(struct tcpcb *); 495void tcp_slowtimo(void); 496struct tcptemp * 497 tcpip_maketemplate(struct inpcb *); 498void tcpip_fillheaders(struct inpcb *, void *, void *); 499struct tcpcb * 500 tcp_timers(struct tcpcb *, int); 501void tcp_trace(int, int, struct tcpcb *, void *, struct tcphdr *, int); 502void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 503void syncache_init(void); 504void syncache_unreach(struct in_conninfo *, struct tcphdr *); 505int syncache_expand(struct in_conninfo *, struct tcphdr *, 506 struct socket **, struct mbuf *); 507int syncache_add(struct in_conninfo *, struct tcpopt *, 508 struct tcphdr *, struct socket **, struct mbuf *); 509void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 510void syncache_badack(struct in_conninfo *); 511 512extern struct pr_usrreqs tcp_usrreqs; 513extern u_long tcp_sendspace; 514extern u_long tcp_recvspace; 515tcp_seq tcp_new_isn(struct tcpcb *); 516 517#endif /* _KERNEL */ 518 519#endif /* _NETINET_TCP_VAR_H_ */ 520