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: src/sys/netinet/tcp_var.h,v 1.56.2.13 2003/02/03 02:34:07 hsu Exp $ 35 * $DragonFly: src/sys/netinet/tcp_var.h,v 1.9 2003/11/08 07:57:51 dillon Exp $ 36 */ 37 38 #ifndef _NETINET_TCP_VAR_H_ 39 #define _NETINET_TCP_VAR_H_ 40 41 #include <netinet/in_pcb.h> /* needed for in_conninfo, inp_gen_t */ 42 43 /* 44 * Kernel variables for tcp. 45 */ 46 extern int tcp_do_rfc1323; 47 extern int tcp_do_rfc1644; 48 49 /* TCP segment queue entry */ 50 struct 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 }; 56 LIST_HEAD(tsegqe_head, tseg_qent); 57 #ifdef MALLOC_DECLARE 58 MALLOC_DECLARE(M_TSEGQ); 59 #endif 60 61 struct 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 */ 72 struct 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 0x000001 /* ack peer immediately */ 87 #define TF_DELACK 0x000002 /* ack, but try to delay it */ 88 #define TF_NODELAY 0x000004 /* don't delay packets to coalesce */ 89 #define TF_NOOPT 0x000008 /* don't use tcp options */ 90 #define TF_SENTFIN 0x000010 /* have sent FIN */ 91 #define TF_REQ_SCALE 0x000020 /* have/will request window scaling */ 92 #define TF_RCVD_SCALE 0x000040 /* other side has requested scaling */ 93 #define TF_REQ_TSTMP 0x000080 /* have/will request timestamps */ 94 #define TF_RCVD_TSTMP 0x000100 /* a timestamp was received in SYN */ 95 #define TF_SACK_PERMIT 0x000200 /* other side said I could SACK */ 96 #define TF_NEEDSYN 0x000400 /* send SYN (implicit state) */ 97 #define TF_NEEDFIN 0x000800 /* send FIN (implicit state) */ 98 #define TF_NOPUSH 0x001000 /* don't push */ 99 #define TF_REQ_CC 0x002000 /* have/will request CC */ 100 #define TF_RCVD_CC 0x004000 /* a CC was received in SYN */ 101 #define TF_SENDCCNEW 0x008000 /* send CCnew instead of CC in SYN */ 102 #define TF_MORETOCOME 0x010000 /* More data to be appended to sock */ 103 #define TF_LQ_OVERFLOW 0x020000 /* listen queue overflow */ 104 #define TF_LASTIDLE 0x040000 /* connection was previously idle */ 105 #define TF_RXWIN0SENT 0x080000 /* sent a receiver win 0 in response */ 106 #define TF_FASTRECOVERY 0x100000 /* in NewReno Fast Recovery */ 107 #define TF_WASFRECOVERY 0x200000 /* was in NewReno Fast Recovery */ 108 #define TF_FIRSTACCACK 0x400000 /* Look for 1st acceptable ACK. */ 109 #define TF_FASTREXMT 0x800000 /* Did Fast Retransmit. */ 110 int t_force; /* 1 if forcing out a byte */ 111 112 tcp_seq snd_una; /* send unacknowledged */ 113 tcp_seq snd_max; /* highest sequence number sent; 114 * used to recognize retransmits 115 */ 116 tcp_seq snd_nxt; /* send next */ 117 tcp_seq snd_up; /* send urgent pointer */ 118 119 tcp_seq snd_wl1; /* window update seg seq number */ 120 tcp_seq snd_wl2; /* window update seg ack number */ 121 tcp_seq iss; /* initial send sequence number */ 122 tcp_seq irs; /* initial receive sequence number */ 123 124 tcp_seq rcv_nxt; /* receive next */ 125 tcp_seq rcv_adv; /* advertised window */ 126 u_long rcv_wnd; /* receive window */ 127 tcp_seq rcv_up; /* receive urgent pointer */ 128 129 u_long snd_wnd; /* send window */ 130 u_long snd_cwnd; /* congestion-controlled window */ 131 u_long snd_bwnd; /* bandwidth-controlled window */ 132 u_long snd_ssthresh; /* snd_cwnd size threshold for 133 * for slow start exponential to 134 * linear switch 135 */ 136 u_long snd_bandwidth; /* calculated bandwidth or 0 */ 137 tcp_seq snd_recover; /* for use in NewReno fast recovery */ 138 139 u_int t_maxopd; /* mss plus options */ 140 141 u_long t_rcvtime; /* inactivity time */ 142 u_long t_starttime; /* time connection was established */ 143 int t_rtttime; /* round trip time */ 144 tcp_seq t_rtseq; /* sequence number being timed */ 145 146 int t_bw_rtttime; /* used for bandwidth calculation */ 147 tcp_seq t_bw_rtseq; /* used for bandwidth calculation */ 148 149 int t_rxtcur; /* current retransmit value (ticks) */ 150 u_int t_maxseg; /* maximum segment size */ 151 int t_srtt; /* smoothed round-trip time */ 152 int t_rttvar; /* variance in round-trip time */ 153 154 int t_rxtshift; /* log(2) of rexmt exp. backoff */ 155 u_int t_rttmin; /* minimum rtt allowed */ 156 u_int t_rttbest; /* best rtt we've seen */ 157 u_long t_rttupdated; /* number of times rtt sampled */ 158 u_long max_sndwnd; /* largest window peer has offered */ 159 160 int t_softerror; /* possible error not yet reported */ 161 /* out-of-band data */ 162 char t_oobflags; /* have some */ 163 char t_iobc; /* input character */ 164 #define TCPOOB_HAVEDATA 0x01 165 #define TCPOOB_HADDATA 0x02 166 /* RFC 1323 variables */ 167 u_char snd_scale; /* window scaling for send window */ 168 u_char rcv_scale; /* window scaling for recv window */ 169 u_char request_r_scale; /* pending window scaling */ 170 u_char requested_s_scale; 171 u_long ts_recent; /* timestamp echo data */ 172 173 u_long ts_recent_age; /* when last updated */ 174 tcp_seq last_ack_sent; 175 /* RFC 1644 variables */ 176 tcp_cc cc_send; /* send connection count */ 177 tcp_cc cc_recv; /* receive connection count */ 178 /* experimental */ 179 u_long snd_cwnd_prev; /* cwnd prior to retransmit */ 180 u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */ 181 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */ 182 u_long t_badrxtwin; /* window for retransmit recovery */ 183 u_long t_rexmtTS; /* timestamp of last retransmit */ 184 u_char snd_limited; /* segments limited transmitted */ 185 }; 186 187 #define IN_FASTRECOVERY(tp) (tp->t_flags & TF_FASTRECOVERY) 188 #define ENTER_FASTRECOVERY(tp) tp->t_flags |= TF_FASTRECOVERY 189 #define EXIT_FASTRECOVERY(tp) tp->t_flags &= ~TF_FASTRECOVERY 190 191 /* 192 * Structure to hold TCP options that are only used during segment 193 * processing (in tcp_input), but not held in the tcpcb. 194 * It's basically used to reduce the number of parameters 195 * to tcp_dooptions. 196 */ 197 struct tcpopt { 198 u_long to_flags; /* which options are present */ 199 #define TOF_TS 0x0001 /* timestamp */ 200 #define TOF_CC 0x0002 /* CC and CCnew are exclusive */ 201 #define TOF_CCNEW 0x0004 202 #define TOF_CCECHO 0x0008 203 #define TOF_MSS 0x0010 204 #define TOF_SCALE 0x0020 205 u_int32_t to_tsval; 206 u_int32_t to_tsecr; 207 tcp_cc to_cc; /* holds CC or CCnew */ 208 tcp_cc to_ccecho; 209 u_int16_t to_mss; 210 u_int8_t to_requested_s_scale; 211 u_int8_t to_pad; 212 }; 213 214 struct syncache { 215 inp_gen_t sc_inp_gencnt; /* pointer check */ 216 struct tcpcb *sc_tp; /* tcb for listening socket */ 217 struct mbuf *sc_ipopts; /* source route */ 218 struct in_conninfo sc_inc; /* addresses */ 219 #define sc_route sc_inc.inc_route 220 #define sc_route6 sc_inc.inc6_route 221 u_int32_t sc_tsrecent; 222 tcp_cc sc_cc_send; /* holds CC or CCnew */ 223 tcp_cc sc_cc_recv; 224 tcp_seq sc_irs; /* seq from peer */ 225 tcp_seq sc_iss; /* our ISS */ 226 u_long sc_rxttime; /* retransmit time */ 227 u_int16_t sc_rxtslot; /* retransmit counter */ 228 u_int16_t sc_peer_mss; /* peer's MSS */ 229 u_int16_t sc_wnd; /* advertised window */ 230 u_int8_t sc_requested_s_scale:4, 231 sc_request_r_scale:4; 232 u_int8_t sc_flags; 233 #define SCF_NOOPT 0x01 /* no TCP options */ 234 #define SCF_WINSCALE 0x02 /* negotiated window scaling */ 235 #define SCF_TIMESTAMP 0x04 /* negotiated timestamps */ 236 #define SCF_CC 0x08 /* negotiated CC */ 237 #define SCF_UNREACH 0x10 /* icmp unreachable received */ 238 #define SCF_KEEPROUTE 0x20 /* keep cloned route */ 239 TAILQ_ENTRY(syncache) sc_hash; 240 TAILQ_ENTRY(syncache) sc_timerq; 241 }; 242 243 struct syncache_head { 244 TAILQ_HEAD(, syncache) sch_bucket; 245 u_int sch_length; 246 }; 247 248 /* 249 * The TAO cache entry which is stored in the protocol family specific 250 * portion of the route metrics. 251 */ 252 struct rmxp_tao { 253 tcp_cc tao_cc; /* latest CC in valid SYN */ 254 tcp_cc tao_ccsent; /* latest CC sent to peer */ 255 u_short tao_mssopt; /* peer's cached MSS */ 256 #ifdef notyet 257 u_short tao_flags; /* cache status flags */ 258 #define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */ 259 #define TAOF_OK 0x0002 /* peer does understand rfc1644 */ 260 #define TAOF_UNDEF 0 /* we don't know yet */ 261 #endif /* notyet */ 262 }; 263 #define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler) 264 265 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 266 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 267 268 /* 269 * The smoothed round-trip time and estimated variance 270 * are stored as fixed point numbers scaled by the values below. 271 * For convenience, these scales are also used in smoothing the average 272 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 273 * With these scales, srtt has 3 bits to the right of the binary point, 274 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 275 * binary point, and is smoothed with an ALPHA of 0.75. 276 */ 277 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */ 278 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */ 279 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */ 280 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */ 281 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */ 282 283 /* 284 * The initial retransmission should happen at rtt + 4 * rttvar. 285 * Because of the way we do the smoothing, srtt and rttvar 286 * will each average +1/2 tick of bias. When we compute 287 * the retransmit timer, we want 1/2 tick of rounding and 288 * 1 extra tick because of +-1/2 tick uncertainty in the 289 * firing of the timer. The bias will give us exactly the 290 * 1.5 tick we need. But, because the bias is 291 * statistical, we have to test that we don't drop below 292 * the minimum feasible timer (which is 2 ticks). 293 * This version of the macro adapted from a paper by Lawrence 294 * Brakmo and Larry Peterson which outlines a problem caused 295 * by insufficient precision in the original implementation, 296 * which results in inappropriately large RTO values for very 297 * fast networks. 298 */ 299 #define TCP_REXMTVAL(tp) \ 300 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \ 301 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT) 302 303 /* 304 * TCP statistics. 305 * Many of these should be kept per connection, 306 * but that's inconvenient at the moment. 307 */ 308 struct tcpstat { 309 u_long tcps_connattempt; /* connections initiated */ 310 u_long tcps_accepts; /* connections accepted */ 311 u_long tcps_connects; /* connections established */ 312 u_long tcps_drops; /* connections dropped */ 313 u_long tcps_conndrops; /* embryonic connections dropped */ 314 u_long tcps_closed; /* conn. closed (includes drops) */ 315 u_long tcps_segstimed; /* segs where we tried to get rtt */ 316 u_long tcps_rttupdated; /* times we succeeded */ 317 u_long tcps_delack; /* delayed acks sent */ 318 u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 319 u_long tcps_rexmttimeo; /* retransmit timeouts */ 320 u_long tcps_persisttimeo; /* persist timeouts */ 321 u_long tcps_keeptimeo; /* keepalive timeouts */ 322 u_long tcps_keepprobe; /* keepalive probes sent */ 323 u_long tcps_keepdrops; /* connections dropped in keepalive */ 324 325 u_long tcps_sndtotal; /* total packets sent */ 326 u_long tcps_sndpack; /* data packets sent */ 327 u_long tcps_sndbyte; /* data bytes sent */ 328 u_long tcps_sndrexmitpack; /* data packets retransmitted */ 329 u_long tcps_sndrexmitbyte; /* data bytes retransmitted */ 330 u_long tcps_sndrtobad; /* spurious RTO retransmissions */ 331 u_long tcps_sndfastrexmitbad; /* spurious Fast Retransmissions */ 332 u_long tcps_eifeldetected; /* Eifel-detected spurious rexmits */ 333 u_long tcps_rttdetected; /* RTT-detected spurious RTO rexmits */ 334 u_long tcps_sndacks; /* ack-only packets sent */ 335 u_long tcps_sndprobe; /* window probes sent */ 336 u_long tcps_sndurg; /* packets sent with URG only */ 337 u_long tcps_sndwinup; /* window update-only packets sent */ 338 u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 339 340 u_long tcps_rcvtotal; /* total packets received */ 341 u_long tcps_rcvpack; /* packets received in sequence */ 342 u_long tcps_rcvbyte; /* bytes received in sequence */ 343 u_long tcps_rcvbadsum; /* packets received with ccksum errs */ 344 u_long tcps_rcvbadoff; /* packets received with bad offset */ 345 u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */ 346 u_long tcps_rcvshort; /* packets received too short */ 347 u_long tcps_rcvduppack; /* duplicate-only packets received */ 348 u_long tcps_rcvdupbyte; /* duplicate-only bytes received */ 349 u_long tcps_rcvpartduppack; /* packets with some duplicate data */ 350 u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 351 u_long tcps_rcvoopack; /* out-of-order packets received */ 352 u_long tcps_rcvoobyte; /* out-of-order bytes received */ 353 u_long tcps_rcvpackafterwin; /* packets with data after window */ 354 u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */ 355 u_long tcps_rcvafterclose; /* packets rcvd after "close" */ 356 u_long tcps_rcvwinprobe; /* rcvd window probe packets */ 357 u_long tcps_rcvdupack; /* rcvd duplicate acks */ 358 u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 359 u_long tcps_rcvackpack; /* rcvd ack packets */ 360 u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */ 361 u_long tcps_rcvwinupd; /* rcvd window update packets */ 362 u_long tcps_pawsdrop; /* segments dropped due to PAWS */ 363 u_long tcps_predack; /* times hdr predict ok for acks */ 364 u_long tcps_preddat; /* times hdr predict ok for data pkts */ 365 u_long tcps_pcbcachemiss; 366 u_long tcps_cachedrtt; /* times cached RTT in route updated */ 367 u_long tcps_cachedrttvar; /* times cached rttvar updated */ 368 u_long tcps_cachedssthresh; /* times cached ssthresh updated */ 369 u_long tcps_usedrtt; /* times RTT initialized from route */ 370 u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */ 371 u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/ 372 u_long tcps_persistdrop; /* timeout in persist state */ 373 u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */ 374 u_long tcps_mturesent; /* resends due to MTU discovery */ 375 u_long tcps_listendrop; /* listen queue overflows */ 376 377 u_long tcps_sc_added; /* entry added to syncache */ 378 u_long tcps_sc_retransmitted; /* syncache entry was retransmitted */ 379 u_long tcps_sc_dupsyn; /* duplicate SYN packet */ 380 u_long tcps_sc_dropped; /* could not reply to packet */ 381 u_long tcps_sc_completed; /* successful extraction of entry */ 382 u_long tcps_sc_bucketoverflow; /* syncache per-bucket limit hit */ 383 u_long tcps_sc_cacheoverflow; /* syncache cache limit hit */ 384 u_long tcps_sc_reset; /* RST removed entry from syncache */ 385 u_long tcps_sc_stale; /* timed out or listen socket gone */ 386 u_long tcps_sc_aborted; /* syncache entry aborted */ 387 u_long tcps_sc_badack; /* removed due to bad ACK */ 388 u_long tcps_sc_unreach; /* ICMP unreachable received */ 389 u_long tcps_sc_zonefail; /* zalloc() failed */ 390 u_long tcps_sc_sendcookie; /* SYN cookie sent */ 391 u_long tcps_sc_recvcookie; /* SYN cookie received */ 392 }; 393 394 /* 395 * TCB structure exported to user-land via sysctl(3). 396 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been 397 * included. Not all of our clients do. 398 */ 399 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_) 400 struct xtcpcb { 401 size_t xt_len; 402 struct inpcb xt_inp; 403 struct tcpcb xt_tp; 404 struct xsocket xt_socket; 405 u_quad_t xt_alignment_hack; 406 }; 407 #endif 408 409 /* 410 * Names for TCP sysctl objects 411 */ 412 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */ 413 #define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */ 414 #define TCPCTL_MSSDFLT 3 /* MSS default */ 415 #define TCPCTL_STATS 4 /* statistics (read-only) */ 416 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */ 417 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */ 418 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */ 419 #define TCPCTL_SENDSPACE 8 /* send buffer space */ 420 #define TCPCTL_RECVSPACE 9 /* receive buffer space */ 421 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */ 422 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */ 423 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */ 424 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */ 425 #define TCPCTL_MAXID 14 426 427 #define TCPCTL_NAMES { \ 428 { 0, 0 }, \ 429 { "rfc1323", CTLTYPE_INT }, \ 430 { "rfc1644", CTLTYPE_INT }, \ 431 { "mssdflt", CTLTYPE_INT }, \ 432 { "stats", CTLTYPE_STRUCT }, \ 433 { "rttdflt", CTLTYPE_INT }, \ 434 { "keepidle", CTLTYPE_INT }, \ 435 { "keepintvl", CTLTYPE_INT }, \ 436 { "sendspace", CTLTYPE_INT }, \ 437 { "recvspace", CTLTYPE_INT }, \ 438 { "keepinit", CTLTYPE_INT }, \ 439 { "pcblist", CTLTYPE_STRUCT }, \ 440 { "delacktime", CTLTYPE_INT }, \ 441 { "v6mssdflt", CTLTYPE_INT }, \ 442 } 443 444 #ifdef _KERNEL 445 #ifdef SYSCTL_DECL 446 SYSCTL_DECL(_net_inet_tcp); 447 #endif 448 449 extern struct inpcbhead tcb; /* head of queue of active tcpcb's */ 450 extern struct inpcbinfo tcbinfo; 451 extern struct tcpstat tcpstat; /* tcp statistics */ 452 extern int tcp_mssdflt; /* XXX */ 453 extern int tcp_delack_enabled; 454 extern int tcp_do_newreno; 455 extern int path_mtu_discovery; 456 extern int ss_fltsz; 457 extern int ss_fltsz_local; 458 459 void tcp_canceltimers (struct tcpcb *); 460 struct tcpcb * 461 tcp_close (struct tcpcb *); 462 void tcp_ctlinput (int, struct sockaddr *, void *); 463 int tcp_ctloutput (struct socket *, struct sockopt *); 464 struct tcpcb * 465 tcp_drop (struct tcpcb *, int); 466 void tcp_drain (void); 467 void tcp_fasttimo (void); 468 struct rmxp_tao * 469 tcp_gettaocache (struct in_conninfo *); 470 void tcp_init (void); 471 void tcp_thread_init (void); 472 void tcp_input (struct mbuf *, int, int); 473 void tcp_mss (struct tcpcb *, int); 474 int tcp_mssopt (struct tcpcb *); 475 void tcp_drop_syn_sent (struct inpcb *, int); 476 void tcp_mtudisc (struct inpcb *, int); 477 struct tcpcb * 478 tcp_newtcpcb (struct inpcb *); 479 int tcp_output (struct tcpcb *); 480 void tcp_quench (struct inpcb *, int); 481 void tcp_respond (struct tcpcb *, void *, 482 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int); 483 struct rtentry * 484 tcp_rtlookup (struct in_conninfo *); 485 void tcp_save_congestion_state(struct tcpcb *tp); 486 void tcp_revert_congestion_state(struct tcpcb *tp); 487 void tcp_setpersist (struct tcpcb *); 488 void tcp_slowtimo (void); 489 struct tcptemp * 490 tcp_maketemplate (struct tcpcb *); 491 void tcp_fillheaders (struct tcpcb *, void *, void *); 492 struct lwkt_port * 493 tcp_soport(struct socket *); 494 struct tcpcb * 495 tcp_timers (struct tcpcb *, int); 496 void tcp_trace (int, int, struct tcpcb *, void *, struct tcphdr *, 497 int); 498 void tcp_xmit_bandwidth_limit(struct tcpcb *tp, tcp_seq ack_seq); 499 void syncache_init(void); 500 void syncache_unreach(struct in_conninfo *, struct tcphdr *); 501 int syncache_expand(struct in_conninfo *, struct tcphdr *, 502 struct socket **, struct mbuf *); 503 int syncache_add(struct in_conninfo *, struct tcpopt *, 504 struct tcphdr *, struct socket **, struct mbuf *); 505 void syncache_chkrst(struct in_conninfo *, struct tcphdr *); 506 void syncache_badack(struct in_conninfo *); 507 508 extern struct pr_usrreqs tcp_usrreqs; 509 extern u_long tcp_sendspace; 510 extern u_long tcp_recvspace; 511 tcp_seq tcp_new_isn (struct tcpcb *); 512 513 #endif /* _KERNEL */ 514 515 #endif /* _NETINET_TCP_VAR_H_ */ 516