1 /* $NetBSD: tcp_var.h,v 1.87 2001/09/11 21:03:21 thorpej Exp $ */ 2 3 /* 4 %%% portions-copyright-nrl-98 5 Portions of this software are Copyright 1998 by Randall Atkinson, 6 Ronald Lee, Daniel McDonald, Bao Phan, and Chris Winters. All Rights 7 Reserved. All rights under this copyright have been assigned to the US 8 Naval Research Laboratory (NRL). The NRL Copyright Notice and License 9 Agreement Version 1.1 (January 17, 1995) applies to these portions of the 10 software. 11 You should have received a copy of the license with this software. If you 12 didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>. 13 14 */ 15 16 /* 17 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 18 * All rights reserved. 19 * 20 * Redistribution and use in source and binary forms, with or without 21 * modification, are permitted provided that the following conditions 22 * are met: 23 * 1. Redistributions of source code must retain the above copyright 24 * notice, this list of conditions and the following disclaimer. 25 * 2. Redistributions in binary form must reproduce the above copyright 26 * notice, this list of conditions and the following disclaimer in the 27 * documentation and/or other materials provided with the distribution. 28 * 3. Neither the name of the project nor the names of its contributors 29 * may be used to endorse or promote products derived from this software 30 * without specific prior written permission. 31 * 32 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 35 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 42 * SUCH DAMAGE. 43 */ 44 45 /*- 46 * Copyright (c) 1997, 1998, 1999, 2001 The NetBSD Foundation, Inc. 47 * All rights reserved. 48 * 49 * This code is derived from software contributed to The NetBSD Foundation 50 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 51 * NASA Ames Research Center. 52 * 53 * Redistribution and use in source and binary forms, with or without 54 * modification, are permitted provided that the following conditions 55 * are met: 56 * 1. Redistributions of source code must retain the above copyright 57 * notice, this list of conditions and the following disclaimer. 58 * 2. Redistributions in binary form must reproduce the above copyright 59 * notice, this list of conditions and the following disclaimer in the 60 * documentation and/or other materials provided with the distribution. 61 * 3. All advertising materials mentioning features or use of this software 62 * must display the following acknowledgement: 63 * This product includes software developed by the NetBSD 64 * Foundation, Inc. and its contributors. 65 * 4. Neither the name of The NetBSD Foundation nor the names of its 66 * contributors may be used to endorse or promote products derived 67 * from this software without specific prior written permission. 68 * 69 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 70 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 71 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 72 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 73 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 74 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 75 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 76 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 77 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 78 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 79 * POSSIBILITY OF SUCH DAMAGE. 80 */ 81 82 /* 83 * Copyright (c) 1982, 1986, 1993, 1994, 1995 84 * The Regents of the University of California. All rights reserved. 85 * 86 * Redistribution and use in source and binary forms, with or without 87 * modification, are permitted provided that the following conditions 88 * are met: 89 * 1. Redistributions of source code must retain the above copyright 90 * notice, this list of conditions and the following disclaimer. 91 * 2. Redistributions in binary form must reproduce the above copyright 92 * notice, this list of conditions and the following disclaimer in the 93 * documentation and/or other materials provided with the distribution. 94 * 3. All advertising materials mentioning features or use of this software 95 * must display the following acknowledgement: 96 * This product includes software developed by the University of 97 * California, Berkeley and its contributors. 98 * 4. Neither the name of the University nor the names of its contributors 99 * may be used to endorse or promote products derived from this software 100 * without specific prior written permission. 101 * 102 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 103 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 104 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 105 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 106 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 107 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 108 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 109 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 110 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 111 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 112 * SUCH DAMAGE. 113 * 114 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 115 */ 116 117 #ifndef _NETINET_TCP_VAR_H_ 118 #define _NETINET_TCP_VAR_H_ 119 120 #if defined(_KERNEL_OPT) 121 #include "opt_inet.h" 122 #endif 123 124 /* 125 * Kernel variables for tcp. 126 */ 127 128 #include <sys/callout.h> 129 130 /* 131 * Tcp control block, one per tcp; fields: 132 */ 133 struct tcpcb { 134 int t_family; /* address family on the wire */ 135 struct ipqehead segq; /* sequencing queue */ 136 struct callout t_timer[TCPT_NTIMERS];/* tcp timers */ 137 short t_state; /* state of this connection */ 138 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 139 uint32_t t_rxtcur; /* current retransmit value */ 140 short t_dupacks; /* consecutive dup acks recd */ 141 u_short t_peermss; /* peer's maximum segment size */ 142 u_short t_ourmss; /* our's maximum segment size */ 143 u_short t_segsz; /* current segment size in use */ 144 char t_force; /* 1 if forcing out a byte */ 145 u_int t_flags; 146 #define TF_ACKNOW 0x0001 /* ack peer immediately */ 147 #define TF_DELACK 0x0002 /* ack, but try to delay it */ 148 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ 149 #define TF_NOOPT 0x0008 /* don't use tcp options */ 150 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ 151 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ 152 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ 153 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ 154 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ 155 #define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */ 156 #define TF_WILL_SACK 0x0800 /* try to use SACK */ 157 #define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */ 158 #define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */ 159 #define TF_REASSEMBLING 0x4000 /* we're busy reassembling */ 160 161 162 struct mbuf *t_template; /* skeletal packet for transmit */ 163 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 164 struct in6pcb *t_in6pcb; /* back pointer to internet pcb */ 165 struct callout t_delack_ch; /* delayed ACK callout */ 166 /* 167 * The following fields are used as in the protocol specification. 168 * See RFC783, Dec. 1981, page 21. 169 */ 170 /* send sequence variables */ 171 tcp_seq snd_una; /* send unacknowledged */ 172 tcp_seq snd_nxt; /* send next */ 173 tcp_seq snd_up; /* send urgent pointer */ 174 tcp_seq snd_wl1; /* window update seg seq number */ 175 tcp_seq snd_wl2; /* window update seg ack number */ 176 tcp_seq iss; /* initial send sequence number */ 177 u_long snd_wnd; /* send window */ 178 tcp_seq snd_recover; /* for use in fast recovery */ 179 /* receive sequence variables */ 180 u_long rcv_wnd; /* receive window */ 181 tcp_seq rcv_nxt; /* receive next */ 182 tcp_seq rcv_up; /* receive urgent pointer */ 183 tcp_seq irs; /* initial receive sequence number */ 184 /* 185 * Additional variables for this implementation. 186 */ 187 /* receive variables */ 188 tcp_seq rcv_adv; /* advertised window */ 189 /* retransmit variables */ 190 tcp_seq snd_max; /* highest sequence number sent; 191 * used to recognize retransmits 192 */ 193 /* congestion control (for slow start, source quench, retransmit after loss) */ 194 u_long snd_cwnd; /* congestion-controlled window */ 195 u_long snd_ssthresh; /* snd_cwnd size threshhold for 196 * for slow start exponential to 197 * linear switch 198 */ 199 /* 200 * transmit timing stuff. See below for scale of srtt and rttvar. 201 * "Variance" is actually smoothed difference. 202 */ 203 uint32_t t_rcvtime; /* time last segment received */ 204 uint32_t t_rtttime; /* time we started measuring rtt */ 205 tcp_seq t_rtseq; /* sequence number being timed */ 206 int32_t t_srtt; /* smoothed round-trip time */ 207 int32_t t_rttvar; /* variance in round-trip time */ 208 uint32_t t_rttmin; /* minimum rtt allowed */ 209 u_long max_sndwnd; /* largest window peer has offered */ 210 211 /* out-of-band data */ 212 char t_oobflags; /* have some */ 213 char t_iobc; /* input character */ 214 #define TCPOOB_HAVEDATA 0x01 215 #define TCPOOB_HADDATA 0x02 216 short t_softerror; /* possible error not yet reported */ 217 218 /* RFC 1323 variables */ 219 u_char snd_scale; /* window scaling for send window */ 220 u_char rcv_scale; /* window scaling for recv window */ 221 u_char request_r_scale; /* pending window scaling */ 222 u_char requested_s_scale; 223 u_int32_t ts_recent; /* timestamp echo data */ 224 u_int32_t ts_recent_age; /* when last updated */ 225 u_int32_t ts_timebase; /* our timebase */ 226 tcp_seq last_ack_sent; 227 228 /* SACK stuff */ 229 struct ipqehead timeq; /* time sequenced queue (for SACK) */ 230 231 /* pointer for syn cache entries*/ 232 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 233 }; 234 235 #ifdef _KERNEL 236 /* 237 * TCP reassembly queue locks. 238 */ 239 static __inline int tcp_reass_lock_try __P((struct tcpcb *)) 240 __attribute__((__unused__)); 241 static __inline void tcp_reass_unlock __P((struct tcpcb *)) 242 __attribute__((__unused__)); 243 244 static __inline int 245 tcp_reass_lock_try(tp) 246 struct tcpcb *tp; 247 { 248 int s; 249 250 /* 251 * Use splvm() -- we're blocking things that would cause 252 * mbuf allocation. 253 */ 254 s = splvm(); 255 if (tp->t_flags & TF_REASSEMBLING) { 256 splx(s); 257 return (0); 258 } 259 tp->t_flags |= TF_REASSEMBLING; 260 splx(s); 261 return (1); 262 } 263 264 static __inline void 265 tcp_reass_unlock(tp) 266 struct tcpcb *tp; 267 { 268 int s; 269 270 s = splvm(); 271 tp->t_flags &= ~TF_REASSEMBLING; 272 splx(s); 273 } 274 275 #ifdef DIAGNOSTIC 276 #define TCP_REASS_LOCK(tp) \ 277 do { \ 278 if (tcp_reass_lock_try(tp) == 0) { \ 279 printf("%s:%d: tcpcb %p reass already locked\n", \ 280 __FILE__, __LINE__, tp); \ 281 panic("tcp_reass_lock"); \ 282 } \ 283 } while (0) 284 #define TCP_REASS_LOCK_CHECK(tp) \ 285 do { \ 286 if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \ 287 printf("%s:%d: tcpcb %p reass lock not held\n", \ 288 __FILE__, __LINE__, tp); \ 289 panic("tcp reass lock check"); \ 290 } \ 291 } while (0) 292 #else 293 #define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp)) 294 #define TCP_REASS_LOCK_CHECK(tp) /* nothing */ 295 #endif 296 297 #define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp)) 298 #endif /* _KERNEL */ 299 300 /* 301 * Queue for delayed ACK processing. 302 */ 303 #ifdef _KERNEL 304 extern int tcp_delack_ticks; 305 void tcp_delack(void *); 306 307 #define TCP_RESTART_DELACK(tp) \ 308 callout_reset(&(tp)->t_delack_ch, tcp_delack_ticks, \ 309 tcp_delack, tp) 310 311 #define TCP_SET_DELACK(tp) \ 312 do { \ 313 if (((tp)->t_flags & TF_DELACK) == 0) { \ 314 (tp)->t_flags |= TF_DELACK; \ 315 TCP_RESTART_DELACK(tp); \ 316 } \ 317 } while (/*CONSTCOND*/0) 318 319 #define TCP_CLEAR_DELACK(tp) \ 320 do { \ 321 if ((tp)->t_flags & TF_DELACK) { \ 322 (tp)->t_flags &= ~TF_DELACK; \ 323 callout_stop(&(tp)->t_delack_ch); \ 324 } \ 325 } while (/*CONSTCOND*/0) 326 #endif /* _KERNEL */ 327 328 /* 329 * Compute the current timestamp for a connection. 330 */ 331 #define TCP_TIMESTAMP(tp) (tcp_now - (tp)->ts_timebase) 332 333 /* 334 * Handy way of passing around TCP option info. 335 */ 336 struct tcp_opt_info { 337 int ts_present; 338 u_int32_t ts_val; 339 u_int32_t ts_ecr; 340 u_int16_t maxseg; 341 }; 342 343 /* 344 * Data for the TCP compressed state engine. 345 */ 346 union syn_cache_sa { 347 struct sockaddr sa; 348 struct sockaddr_in sin; 349 #if 1 /*def INET6*/ 350 struct sockaddr_in6 sin6; 351 #endif 352 }; 353 354 struct syn_cache { 355 TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 356 struct callout sc_timer; /* rexmt timer */ 357 union { /* cached route */ 358 struct route route4; 359 #ifdef INET6 360 struct route_in6 route6; 361 #endif 362 } sc_route_u; 363 #define sc_route4 sc_route_u.route4 364 #ifdef INET6 365 #define sc_route6 sc_route_u.route6 366 #endif 367 long sc_win; /* advertised window */ 368 int sc_bucketidx; /* our bucket index */ 369 u_int32_t sc_hash; 370 u_int32_t sc_timestamp; /* timestamp from SYN */ 371 u_int32_t sc_timebase; /* our local timebase */ 372 union syn_cache_sa sc_src; 373 union syn_cache_sa sc_dst; 374 tcp_seq sc_irs; 375 tcp_seq sc_iss; 376 u_int sc_rxtcur; /* current rxt timeout */ 377 u_int sc_rxttot; /* total time spend on queues */ 378 u_short sc_rxtshift; /* for computing backoff */ 379 u_short sc_flags; 380 381 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 382 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 383 384 struct mbuf *sc_ipopts; /* IP options */ 385 u_int16_t sc_peermaxseg; 386 u_int16_t sc_ourmaxseg; 387 u_int8_t sc_request_r_scale : 4, 388 sc_requested_s_scale : 4; 389 390 struct tcpcb *sc_tp; /* tcb for listening socket */ 391 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 392 }; 393 394 struct syn_cache_head { 395 TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 396 u_short sch_length; /* # entries in bucket */ 397 }; 398 399 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 400 #ifdef INET6 401 #define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb) 402 #endif 403 #ifndef INET6 404 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 405 #else 406 #define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \ 407 ? intotcpcb(sotoinpcb(so)) \ 408 : in6totcpcb(sotoin6pcb(so))) 409 #endif 410 411 /* 412 * The smoothed round-trip time and estimated variance 413 * are stored as fixed point numbers scaled by the values below. 414 * For convenience, these scales are also used in smoothing the average 415 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 416 * With these scales, srtt has 3 bits to the right of the binary point, 417 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 418 * binary point, and is smoothed with an ALPHA of 0.75. 419 */ 420 #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ 421 #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ 422 423 /* 424 * The initial retransmission should happen at rtt + 4 * rttvar. 425 * Because of the way we do the smoothing, srtt and rttvar 426 * will each average +1/2 tick of bias. When we compute 427 * the retransmit timer, we want 1/2 tick of rounding and 428 * 1 extra tick because of +-1/2 tick uncertainty in the 429 * firing of the timer. The bias will give us exactly the 430 * 1.5 tick we need. But, because the bias is 431 * statistical, we have to test that we don't drop below 432 * the minimum feasible timer (which is 2 ticks). 433 * This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT 434 * is the same as the multiplier for rttvar. 435 */ 436 #define TCP_REXMTVAL(tp) \ 437 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) 438 439 /* 440 * Compute the initial window for slow start. 441 */ 442 #define TCP_INITIAL_WINDOW(iw, segsz) \ 443 (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \ 444 ((segsz) * (iw))) 445 446 /* 447 * TCP statistics. 448 * Many of these should be kept per connection, 449 * but that's inconvenient at the moment. 450 */ 451 struct tcpstat { 452 u_quad_t tcps_connattempt; /* connections initiated */ 453 u_quad_t tcps_accepts; /* connections accepted */ 454 u_quad_t tcps_connects; /* connections established */ 455 u_quad_t tcps_drops; /* connections dropped */ 456 u_quad_t tcps_conndrops; /* embryonic connections dropped */ 457 u_quad_t tcps_closed; /* conn. closed (includes drops) */ 458 u_quad_t tcps_segstimed; /* segs where we tried to get rtt */ 459 u_quad_t tcps_rttupdated; /* times we succeeded */ 460 u_quad_t tcps_delack; /* delayed acks sent */ 461 u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 462 u_quad_t tcps_rexmttimeo; /* retransmit timeouts */ 463 u_quad_t tcps_persisttimeo; /* persist timeouts */ 464 u_quad_t tcps_keeptimeo; /* keepalive timeouts */ 465 u_quad_t tcps_keepprobe; /* keepalive probes sent */ 466 u_quad_t tcps_keepdrops; /* connections dropped in keepalive */ 467 u_quad_t tcps_persistdrops; /* connections dropped in persist */ 468 u_quad_t tcps_connsdrained; /* connections drained due to memory 469 shortage */ 470 471 u_quad_t tcps_sndtotal; /* total packets sent */ 472 u_quad_t tcps_sndpack; /* data packets sent */ 473 u_quad_t tcps_sndbyte; /* data bytes sent */ 474 u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */ 475 u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 476 u_quad_t tcps_sndacks; /* ack-only packets sent */ 477 u_quad_t tcps_sndprobe; /* window probes sent */ 478 u_quad_t tcps_sndurg; /* packets sent with URG only */ 479 u_quad_t tcps_sndwinup; /* window update-only packets sent */ 480 u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 481 482 u_quad_t tcps_rcvtotal; /* total packets received */ 483 u_quad_t tcps_rcvpack; /* packets received in sequence */ 484 u_quad_t tcps_rcvbyte; /* bytes received in sequence */ 485 u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */ 486 u_quad_t tcps_rcvbadoff; /* packets received with bad offset */ 487 u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 488 u_quad_t tcps_rcvshort; /* packets received too short */ 489 u_quad_t tcps_rcvduppack; /* duplicate-only packets received */ 490 u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 491 u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */ 492 u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 493 u_quad_t tcps_rcvoopack; /* out-of-order packets received */ 494 u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */ 495 u_quad_t tcps_rcvpackafterwin; /* packets with data after window */ 496 u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 497 u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */ 498 u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */ 499 u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */ 500 u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 501 u_quad_t tcps_rcvackpack; /* rcvd ack packets */ 502 u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 503 u_quad_t tcps_rcvwinupd; /* rcvd window update packets */ 504 u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */ 505 u_quad_t tcps_predack; /* times hdr predict ok for acks */ 506 u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */ 507 508 u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 509 u_quad_t tcps_noport; /* no socket on port */ 510 u_quad_t tcps_badsyn; /* received ack for which we have 511 no SYN in compressed state */ 512 513 /* These statistics deal with the SYN cache. */ 514 u_quad_t tcps_sc_added; /* # of entries added */ 515 u_quad_t tcps_sc_completed; /* # of connections completed */ 516 u_quad_t tcps_sc_timed_out; /* # of entries timed out */ 517 u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */ 518 u_quad_t tcps_sc_reset; /* # dropped due to RST */ 519 u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 520 u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 521 u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 522 u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 523 u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 524 u_quad_t tcps_sc_collisions; /* # of hash collisions */ 525 u_quad_t tcps_sc_retransmitted; /* # of retransmissions */ 526 527 u_quad_t tcps_selfquench; /* # of ENOBUFS we get on output */ 528 }; 529 530 /* 531 * Names for TCP sysctl objects. 532 */ 533 #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */ 534 #define TCPCTL_SENDSPACE 2 /* default send buffer */ 535 #define TCPCTL_RECVSPACE 3 /* default recv buffer */ 536 #define TCPCTL_MSSDFLT 4 /* default seg size */ 537 #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */ 538 #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */ 539 #if 0 /*obsoleted*/ 540 #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */ 541 #endif 542 #define TCPCTL_INIT_WIN 8 /* initial window */ 543 #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */ 544 #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */ 545 #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */ 546 #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */ 547 #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */ 548 #define TCPCTL_CWM 14 /* Congestion Window Monitoring */ 549 #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */ 550 #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */ 551 #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */ 552 #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */ 553 #define TCPCTL_KEEPCNT 19 /* keepalive count */ 554 #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */ 555 #define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */ 556 #define TCPCTL_LOG_REFUSED 22 /* Log refused connections */ 557 #if 0 /*obsoleted*/ 558 #define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */ 559 #endif 560 #define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */ 561 #define TCPCTL_DELACK_TICKS 25 /* # ticks to delay ACK */ 562 #define TCPCTL_MAXID 26 563 564 #define TCPCTL_NAMES { \ 565 { 0, 0 }, \ 566 { "rfc1323", CTLTYPE_INT }, \ 567 { "sendspace", CTLTYPE_INT }, \ 568 { "recvspace", CTLTYPE_INT }, \ 569 { "mssdflt", CTLTYPE_INT }, \ 570 { "syn_cache_limit", CTLTYPE_INT }, \ 571 { "syn_bucket_limit", CTLTYPE_INT }, \ 572 { 0, 0 },\ 573 { "init_win", CTLTYPE_INT }, \ 574 { "mss_ifmtu", CTLTYPE_INT }, \ 575 { "sack", CTLTYPE_INT }, \ 576 { "win_scale", CTLTYPE_INT }, \ 577 { "timestamps", CTLTYPE_INT }, \ 578 { "compat_42", CTLTYPE_INT }, \ 579 { "cwm", CTLTYPE_INT }, \ 580 { "cwm_burstsize", CTLTYPE_INT }, \ 581 { "ack_on_push", CTLTYPE_INT }, \ 582 { "keepidle", CTLTYPE_INT }, \ 583 { "keepintvl", CTLTYPE_INT }, \ 584 { "keepcnt", CTLTYPE_INT }, \ 585 { "slowhz", CTLTYPE_INT }, \ 586 { "newreno", CTLTYPE_INT }, \ 587 { "log_refused",CTLTYPE_INT }, \ 588 { 0, 0 }, \ 589 { "rstppslimit", CTLTYPE_INT }, \ 590 { "delack_ticks", CTLTYPE_INT }, \ 591 } 592 593 #ifdef _KERNEL 594 struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 595 #ifdef INET6 596 extern struct in6pcb tcb6; 597 #endif 598 struct tcpstat tcpstat; /* tcp statistics */ 599 u_int32_t tcp_now; /* for RFC 1323 timestamps */ 600 extern int tcp_do_rfc1323; /* enabled/disabled? */ 601 extern int tcp_do_sack; /* SACK enabled/disabled? */ 602 extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */ 603 extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */ 604 extern int tcp_do_newreno; /* Use the New Reno algorithms */ 605 extern int tcp_mssdflt; /* default seg size */ 606 extern int tcp_init_win; /* initial window */ 607 extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */ 608 extern int tcp_compat_42; /* work around ancient broken TCP peers */ 609 extern int tcp_cwm; /* enable Congestion Window Monitoring */ 610 extern int tcp_cwm_burstsize; /* burst size allowed by CWM */ 611 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 612 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 613 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 614 extern int tcp_log_refused; /* log refused connections */ 615 616 extern int tcp_rst_ppslim; 617 618 extern int tcp_syn_cache_size; 619 extern struct syn_cache_head tcp_syn_cache[]; 620 extern u_long syn_cache_count; 621 622 #define TCPCTL_VARIABLES { \ 623 { 0 }, \ 624 { 1, 0, &tcp_do_rfc1323 }, \ 625 { 1, 0, &tcp_sendspace }, \ 626 { 1, 0, &tcp_recvspace }, \ 627 { 1, 0, &tcp_mssdflt }, \ 628 { 1, 0, &tcp_syn_cache_limit }, \ 629 { 1, 0, &tcp_syn_bucket_limit }, \ 630 { 0 }, \ 631 { 1, 0, &tcp_init_win }, \ 632 { 1, 0, &tcp_mss_ifmtu }, \ 633 { 1, 0, &tcp_do_sack }, \ 634 { 1, 0, &tcp_do_win_scale }, \ 635 { 1, 0, &tcp_do_timestamps }, \ 636 { 1, 0, &tcp_compat_42 }, \ 637 { 1, 0, &tcp_cwm }, \ 638 { 1, 0, &tcp_cwm_burstsize }, \ 639 { 1, 0, &tcp_ack_on_push }, \ 640 { 1, 0, &tcp_keepidle }, \ 641 { 1, 0, &tcp_keepintvl }, \ 642 { 1, 0, &tcp_keepcnt }, \ 643 { 1, 1, 0, PR_SLOWHZ }, \ 644 { 1, 0, &tcp_do_newreno }, \ 645 { 1, 0, &tcp_log_refused }, \ 646 { 0 }, \ 647 { 1, 0, &tcp_rst_ppslim }, \ 648 { 1, 0, &tcp_delack_ticks }, \ 649 } 650 651 int tcp_attach __P((struct socket *)); 652 void tcp_canceltimers __P((struct tcpcb *)); 653 struct tcpcb * 654 tcp_close __P((struct tcpcb *)); 655 #ifdef INET6 656 void tcp6_ctlinput __P((int, struct sockaddr *, void *)); 657 #endif 658 void *tcp_ctlinput __P((int, struct sockaddr *, void *)); 659 int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 660 struct tcpcb * 661 tcp_disconnect __P((struct tcpcb *)); 662 struct tcpcb * 663 tcp_drop __P((struct tcpcb *, int)); 664 void tcp_dooptions __P((struct tcpcb *, 665 u_char *, int, struct tcphdr *, struct tcp_opt_info *)); 666 void tcp_drain __P((void)); 667 void tcp_established __P((struct tcpcb *)); 668 void tcp_init __P((void)); 669 #ifdef INET6 670 int tcp6_input __P((struct mbuf **, int *, int)); 671 #endif 672 void tcp_input __P((struct mbuf *, ...)); 673 u_long tcp_mss_to_advertise __P((const struct ifnet *, int)); 674 void tcp_mss_from_peer __P((struct tcpcb *, int)); 675 struct tcpcb * 676 tcp_newtcpcb __P((int, void *)); 677 void tcp_notify __P((struct inpcb *, int)); 678 #ifdef INET6 679 void tcp6_notify __P((struct in6pcb *, int)); 680 #endif 681 u_int tcp_optlen __P((struct tcpcb *)); 682 int tcp_output __P((struct tcpcb *)); 683 void tcp_pulloutofband __P((struct socket *, 684 struct tcphdr *, struct mbuf *, int)); 685 void tcp_quench __P((struct inpcb *, int)); 686 #ifdef INET6 687 void tcp6_quench __P((struct in6pcb *, int)); 688 #endif 689 int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *)); 690 int tcp_respond __P((struct tcpcb *, struct mbuf *, struct mbuf *, 691 struct tcphdr *, tcp_seq, tcp_seq, int)); 692 void tcp_rmx_rtt __P((struct tcpcb *)); 693 void tcp_setpersist __P((struct tcpcb *)); 694 void tcp_slowtimo __P((void)); 695 struct mbuf * 696 tcp_template __P((struct tcpcb *)); 697 void tcp_trace __P((int, int, struct tcpcb *, struct mbuf *, int)); 698 struct tcpcb * 699 tcp_usrclosed __P((struct tcpcb *)); 700 int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 701 int tcp_usrreq __P((struct socket *, 702 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 703 void tcp_xmit_timer __P((struct tcpcb *, uint32_t)); 704 tcp_seq tcp_new_iss __P((struct tcpcb *, tcp_seq)); 705 tcp_seq tcp_new_iss1 __P((void *, void *, u_int16_t, u_int16_t, size_t, 706 tcp_seq)); 707 708 int syn_cache_add __P((struct sockaddr *, struct sockaddr *, 709 struct tcphdr *, unsigned int, struct socket *, 710 struct mbuf *, u_char *, int, struct tcp_opt_info *)); 711 void syn_cache_unreach __P((struct sockaddr *, struct sockaddr *, 712 struct tcphdr *)); 713 struct socket *syn_cache_get __P((struct sockaddr *, struct sockaddr *, 714 struct tcphdr *, unsigned int, unsigned int, 715 struct socket *so, struct mbuf *)); 716 void syn_cache_init __P((void)); 717 void syn_cache_insert __P((struct syn_cache *, struct tcpcb *)); 718 struct syn_cache *syn_cache_lookup __P((struct sockaddr *, struct sockaddr *, 719 struct syn_cache_head **)); 720 void syn_cache_reset __P((struct sockaddr *, struct sockaddr *, 721 struct tcphdr *)); 722 int syn_cache_respond __P((struct syn_cache *, struct mbuf *)); 723 void syn_cache_timer __P((void *)); 724 void syn_cache_cleanup __P((struct tcpcb *)); 725 726 int tcp_newreno __P((struct tcpcb *, struct tcphdr *)); 727 #endif 728 729 #endif /* _NETINET_TCP_VAR_H_ */ 730