1 /* $NetBSD: tcp_var.h,v 1.82 2001/07/31 00:57:45 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 /* 129 * Tcp control block, one per tcp; fields: 130 */ 131 struct tcpcb { 132 int t_family; /* address family on the wire */ 133 struct ipqehead segq; /* sequencing queue */ 134 u_int t_timer[TCPT_NTIMERS]; /* tcp timers */ 135 short t_state; /* state of this connection */ 136 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 137 short t_rxtcur; /* current retransmit value */ 138 short t_dupacks; /* consecutive dup acks recd */ 139 u_short t_peermss; /* peer's maximum segment size */ 140 u_short t_ourmss; /* our's maximum segment size */ 141 u_short t_segsz; /* current segment size in use */ 142 char t_force; /* 1 if forcing out a byte */ 143 u_int t_flags; 144 #define TF_ACKNOW 0x0001 /* ack peer immediately */ 145 #define TF_DELACK 0x0002 /* ack, but try to delay it */ 146 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ 147 #define TF_NOOPT 0x0008 /* don't use tcp options */ 148 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ 149 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ 150 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ 151 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ 152 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ 153 #define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */ 154 #define TF_WILL_SACK 0x0800 /* try to use SACK */ 155 #define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */ 156 #define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */ 157 #define TF_REASSEMBLING 0x4000 /* we're busy reassembling */ 158 159 160 struct mbuf *t_template; /* skeletal packet for transmit */ 161 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 162 struct in6pcb *t_in6pcb; /* back pointer to internet pcb */ 163 LIST_ENTRY(tcpcb) t_delack; /* delayed ACK queue */ 164 /* 165 * The following fields are used as in the protocol specification. 166 * See RFC783, Dec. 1981, page 21. 167 */ 168 /* send sequence variables */ 169 tcp_seq snd_una; /* send unacknowledged */ 170 tcp_seq snd_nxt; /* send next */ 171 tcp_seq snd_up; /* send urgent pointer */ 172 tcp_seq snd_wl1; /* window update seg seq number */ 173 tcp_seq snd_wl2; /* window update seg ack number */ 174 tcp_seq iss; /* initial send sequence number */ 175 u_long snd_wnd; /* send window */ 176 tcp_seq snd_recover; /* for use in fast recovery */ 177 /* receive sequence variables */ 178 u_long rcv_wnd; /* receive window */ 179 tcp_seq rcv_nxt; /* receive next */ 180 tcp_seq rcv_up; /* receive urgent pointer */ 181 tcp_seq irs; /* initial receive sequence number */ 182 /* 183 * Additional variables for this implementation. 184 */ 185 /* receive variables */ 186 tcp_seq rcv_adv; /* advertised window */ 187 /* retransmit variables */ 188 tcp_seq snd_max; /* highest sequence number sent; 189 * used to recognize retransmits 190 */ 191 /* congestion control (for slow start, source quench, retransmit after loss) */ 192 u_long snd_cwnd; /* congestion-controlled window */ 193 u_long snd_ssthresh; /* snd_cwnd size threshhold for 194 * for slow start exponential to 195 * linear switch 196 */ 197 /* 198 * transmit timing stuff. See below for scale of srtt and rttvar. 199 * "Variance" is actually smoothed difference. 200 */ 201 short t_idle; /* inactivity time */ 202 short t_rtt; /* round trip time */ 203 tcp_seq t_rtseq; /* sequence number being timed */ 204 short t_srtt; /* smoothed round-trip time */ 205 short t_rttvar; /* variance in round-trip time */ 206 short t_rttmin; /* minimum rtt allowed */ 207 u_long max_sndwnd; /* largest window peer has offered */ 208 209 /* out-of-band data */ 210 char t_oobflags; /* have some */ 211 char t_iobc; /* input character */ 212 #define TCPOOB_HAVEDATA 0x01 213 #define TCPOOB_HADDATA 0x02 214 short t_softerror; /* possible error not yet reported */ 215 216 /* RFC 1323 variables */ 217 u_char snd_scale; /* window scaling for send window */ 218 u_char rcv_scale; /* window scaling for recv window */ 219 u_char request_r_scale; /* pending window scaling */ 220 u_char requested_s_scale; 221 u_int32_t ts_recent; /* timestamp echo data */ 222 u_int32_t ts_recent_age; /* when last updated */ 223 u_int32_t ts_timebase; /* our timebase */ 224 tcp_seq last_ack_sent; 225 226 /* SACK stuff */ 227 struct ipqehead timeq; /* time sequenced queue (for SACK) */ 228 229 /* pointer for syn cache entries*/ 230 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 231 }; 232 233 #ifdef _KERNEL 234 /* 235 * TCP reassembly queue locks. 236 */ 237 static __inline int tcp_reass_lock_try __P((struct tcpcb *)) 238 __attribute__((__unused__)); 239 static __inline void tcp_reass_unlock __P((struct tcpcb *)) 240 __attribute__((__unused__)); 241 242 static __inline int 243 tcp_reass_lock_try(tp) 244 struct tcpcb *tp; 245 { 246 int s; 247 248 /* 249 * Use splvm() -- we're blocking things that would cause 250 * mbuf allocation. 251 */ 252 s = splvm(); 253 if (tp->t_flags & TF_REASSEMBLING) { 254 splx(s); 255 return (0); 256 } 257 tp->t_flags |= TF_REASSEMBLING; 258 splx(s); 259 return (1); 260 } 261 262 static __inline void 263 tcp_reass_unlock(tp) 264 struct tcpcb *tp; 265 { 266 int s; 267 268 s = splvm(); 269 tp->t_flags &= ~TF_REASSEMBLING; 270 splx(s); 271 } 272 273 #ifdef DIAGNOSTIC 274 #define TCP_REASS_LOCK(tp) \ 275 do { \ 276 if (tcp_reass_lock_try(tp) == 0) { \ 277 printf("%s:%d: tcpcb %p reass already locked\n", \ 278 __FILE__, __LINE__, tp); \ 279 panic("tcp_reass_lock"); \ 280 } \ 281 } while (0) 282 #define TCP_REASS_LOCK_CHECK(tp) \ 283 do { \ 284 if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \ 285 printf("%s:%d: tcpcb %p reass lock not held\n", \ 286 __FILE__, __LINE__, tp); \ 287 panic("tcp reass lock check"); \ 288 } \ 289 } while (0) 290 #else 291 #define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp)) 292 #define TCP_REASS_LOCK_CHECK(tp) /* nothing */ 293 #endif 294 295 #define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp)) 296 #endif /* _KERNEL */ 297 298 /* 299 * Queue for delayed ACK processing. 300 */ 301 LIST_HEAD(tcp_delack_head, tcpcb); 302 #ifdef _KERNEL 303 extern struct tcp_delack_head tcp_delacks; 304 305 #define TCP_SET_DELACK(tp) \ 306 do { \ 307 if (((tp)->t_flags & TF_DELACK) == 0) { \ 308 (tp)->t_flags |= TF_DELACK; \ 309 LIST_INSERT_HEAD(&tcp_delacks, (tp), t_delack); \ 310 } \ 311 } while (0) 312 313 #define TCP_CLEAR_DELACK(tp) \ 314 do { \ 315 if ((tp)->t_flags & TF_DELACK) { \ 316 (tp)->t_flags &= ~TF_DELACK; \ 317 LIST_REMOVE((tp), t_delack); \ 318 } \ 319 } while (0) 320 #endif /* _KERNEL */ 321 322 /* 323 * Compute the current timestamp for a connection. 324 */ 325 #define TCP_TIMESTAMP(tp) (tcp_now - (tp)->ts_timebase) 326 327 /* 328 * Handy way of passing around TCP option info. 329 */ 330 struct tcp_opt_info { 331 int ts_present; 332 u_int32_t ts_val; 333 u_int32_t ts_ecr; 334 u_int16_t maxseg; 335 }; 336 337 /* 338 * Data for the TCP compressed state engine. 339 */ 340 union syn_cache_sa { 341 struct sockaddr sa; 342 struct sockaddr_in sin; 343 #if 1 /*def INET6*/ 344 struct sockaddr_in6 sin6; 345 #endif 346 }; 347 348 struct syn_cache { 349 LIST_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 350 TAILQ_ENTRY(syn_cache) sc_timeq; /* link on timer queue */ 351 union { /* cached route */ 352 struct route route4; 353 #ifdef INET6 354 struct route_in6 route6; 355 #endif 356 } sc_route_u; 357 #define sc_route4 sc_route_u.route4 358 #ifdef INET6 359 #define sc_route6 sc_route_u.route6 360 #endif 361 long sc_win; /* advertised window */ 362 int sc_bucketidx; /* our bucket index */ 363 u_int32_t sc_hash; 364 u_int32_t sc_timestamp; /* timestamp from SYN */ 365 u_int32_t sc_timebase; /* our local timebase */ 366 union syn_cache_sa sc_src; 367 union syn_cache_sa sc_dst; 368 tcp_seq sc_irs; 369 tcp_seq sc_iss; 370 u_int sc_rexmt; /* retransmit timer */ 371 u_int sc_rxtcur; /* current rxt timeout */ 372 u_int sc_rxttot; /* total time spend on queues */ 373 u_short sc_rxtshift; /* for computing backoff */ 374 u_short sc_flags; 375 376 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 377 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 378 379 struct mbuf *sc_ipopts; /* IP options */ 380 u_int16_t sc_peermaxseg; 381 u_int16_t sc_ourmaxseg; 382 u_int8_t sc_request_r_scale : 4, 383 sc_requested_s_scale : 4; 384 385 struct tcpcb *sc_tp; /* tcb for listening socket */ 386 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 387 }; 388 389 struct syn_cache_head { 390 LIST_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 391 u_short sch_length; /* # entries in bucket */ 392 }; 393 394 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 395 #ifdef INET6 396 #define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb) 397 #endif 398 #ifndef INET6 399 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 400 #else 401 #define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \ 402 ? intotcpcb(sotoinpcb(so)) \ 403 : in6totcpcb(sotoin6pcb(so))) 404 #endif 405 406 /* 407 * The smoothed round-trip time and estimated variance 408 * are stored as fixed point numbers scaled by the values below. 409 * For convenience, these scales are also used in smoothing the average 410 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 411 * With these scales, srtt has 3 bits to the right of the binary point, 412 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 413 * binary point, and is smoothed with an ALPHA of 0.75. 414 */ 415 #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ 416 #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ 417 418 /* 419 * The initial retransmission should happen at rtt + 4 * rttvar. 420 * Because of the way we do the smoothing, srtt and rttvar 421 * will each average +1/2 tick of bias. When we compute 422 * the retransmit timer, we want 1/2 tick of rounding and 423 * 1 extra tick because of +-1/2 tick uncertainty in the 424 * firing of the timer. The bias will give us exactly the 425 * 1.5 tick we need. But, because the bias is 426 * statistical, we have to test that we don't drop below 427 * the minimum feasible timer (which is 2 ticks). 428 * This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT 429 * is the same as the multiplier for rttvar. 430 */ 431 #define TCP_REXMTVAL(tp) \ 432 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) 433 434 /* 435 * Compute the initial window for slow start. 436 */ 437 #define TCP_INITIAL_WINDOW(iw, segsz) \ 438 (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \ 439 ((segsz) * (iw))) 440 441 /* 442 * TCP statistics. 443 * Many of these should be kept per connection, 444 * but that's inconvenient at the moment. 445 */ 446 struct tcpstat { 447 u_quad_t tcps_connattempt; /* connections initiated */ 448 u_quad_t tcps_accepts; /* connections accepted */ 449 u_quad_t tcps_connects; /* connections established */ 450 u_quad_t tcps_drops; /* connections dropped */ 451 u_quad_t tcps_conndrops; /* embryonic connections dropped */ 452 u_quad_t tcps_closed; /* conn. closed (includes drops) */ 453 u_quad_t tcps_segstimed; /* segs where we tried to get rtt */ 454 u_quad_t tcps_rttupdated; /* times we succeeded */ 455 u_quad_t tcps_delack; /* delayed acks sent */ 456 u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 457 u_quad_t tcps_rexmttimeo; /* retransmit timeouts */ 458 u_quad_t tcps_persisttimeo; /* persist timeouts */ 459 u_quad_t tcps_keeptimeo; /* keepalive timeouts */ 460 u_quad_t tcps_keepprobe; /* keepalive probes sent */ 461 u_quad_t tcps_keepdrops; /* connections dropped in keepalive */ 462 u_quad_t tcps_persistdrops; /* connections dropped in persist */ 463 u_quad_t tcps_connsdrained; /* connections drained due to memory 464 shortage */ 465 466 u_quad_t tcps_sndtotal; /* total packets sent */ 467 u_quad_t tcps_sndpack; /* data packets sent */ 468 u_quad_t tcps_sndbyte; /* data bytes sent */ 469 u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */ 470 u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 471 u_quad_t tcps_sndacks; /* ack-only packets sent */ 472 u_quad_t tcps_sndprobe; /* window probes sent */ 473 u_quad_t tcps_sndurg; /* packets sent with URG only */ 474 u_quad_t tcps_sndwinup; /* window update-only packets sent */ 475 u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 476 477 u_quad_t tcps_rcvtotal; /* total packets received */ 478 u_quad_t tcps_rcvpack; /* packets received in sequence */ 479 u_quad_t tcps_rcvbyte; /* bytes received in sequence */ 480 u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */ 481 u_quad_t tcps_rcvbadoff; /* packets received with bad offset */ 482 u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 483 u_quad_t tcps_rcvshort; /* packets received too short */ 484 u_quad_t tcps_rcvduppack; /* duplicate-only packets received */ 485 u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 486 u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */ 487 u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 488 u_quad_t tcps_rcvoopack; /* out-of-order packets received */ 489 u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */ 490 u_quad_t tcps_rcvpackafterwin; /* packets with data after window */ 491 u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 492 u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */ 493 u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */ 494 u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */ 495 u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 496 u_quad_t tcps_rcvackpack; /* rcvd ack packets */ 497 u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 498 u_quad_t tcps_rcvwinupd; /* rcvd window update packets */ 499 u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */ 500 u_quad_t tcps_predack; /* times hdr predict ok for acks */ 501 u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */ 502 503 u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 504 u_quad_t tcps_noport; /* no socket on port */ 505 u_quad_t tcps_badsyn; /* received ack for which we have 506 no SYN in compressed state */ 507 508 /* These statistics deal with the SYN cache. */ 509 u_quad_t tcps_sc_added; /* # of entries added */ 510 u_quad_t tcps_sc_completed; /* # of connections completed */ 511 u_quad_t tcps_sc_timed_out; /* # of entries timed out */ 512 u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */ 513 u_quad_t tcps_sc_reset; /* # dropped due to RST */ 514 u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 515 u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 516 u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 517 u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 518 u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 519 u_quad_t tcps_sc_collisions; /* # of hash collisions */ 520 u_quad_t tcps_sc_retransmitted; /* # of retransmissions */ 521 522 u_quad_t tcps_selfquench; /* # of ENOBUFS we get on output */ 523 }; 524 525 /* 526 * Names for TCP sysctl objects. 527 */ 528 #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */ 529 #define TCPCTL_SENDSPACE 2 /* default send buffer */ 530 #define TCPCTL_RECVSPACE 3 /* default recv buffer */ 531 #define TCPCTL_MSSDFLT 4 /* default seg size */ 532 #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */ 533 #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */ 534 #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */ 535 #define TCPCTL_INIT_WIN 8 /* initial window */ 536 #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */ 537 #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */ 538 #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */ 539 #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */ 540 #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */ 541 #define TCPCTL_CWM 14 /* Congestion Window Monitoring */ 542 #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */ 543 #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */ 544 #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */ 545 #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */ 546 #define TCPCTL_KEEPCNT 19 /* keepalive count */ 547 #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */ 548 #define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */ 549 #define TCPCTL_LOG_REFUSED 22 /* Log refused connections */ 550 #if 0 /*obsoleted*/ 551 #define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */ 552 #endif 553 #define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */ 554 #define TCPCTL_MAXID 25 555 556 #define TCPCTL_NAMES { \ 557 { 0, 0 }, \ 558 { "rfc1323", CTLTYPE_INT }, \ 559 { "sendspace", CTLTYPE_INT }, \ 560 { "recvspace", CTLTYPE_INT }, \ 561 { "mssdflt", CTLTYPE_INT }, \ 562 { "syn_cache_limit", CTLTYPE_INT }, \ 563 { "syn_bucket_limit", CTLTYPE_INT }, \ 564 { "syn_cache_interval", CTLTYPE_INT },\ 565 { "init_win", CTLTYPE_INT }, \ 566 { "mss_ifmtu", CTLTYPE_INT }, \ 567 { "sack", CTLTYPE_INT }, \ 568 { "win_scale", CTLTYPE_INT }, \ 569 { "timestamps", CTLTYPE_INT }, \ 570 { "compat_42", CTLTYPE_INT }, \ 571 { "cwm", CTLTYPE_INT }, \ 572 { "cwm_burstsize", CTLTYPE_INT }, \ 573 { "ack_on_push", CTLTYPE_INT }, \ 574 { "keepidle", CTLTYPE_INT }, \ 575 { "keepintvl", CTLTYPE_INT }, \ 576 { "keepcnt", CTLTYPE_INT }, \ 577 { "slowhz", CTLTYPE_INT }, \ 578 { "newreno", CTLTYPE_INT }, \ 579 { "log_refused",CTLTYPE_INT }, \ 580 { 0, 0 }, \ 581 { "rstppslimit", CTLTYPE_INT }, \ 582 } 583 584 #ifdef _KERNEL 585 struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 586 #ifdef INET6 587 extern struct in6pcb tcb6; 588 #endif 589 struct tcpstat tcpstat; /* tcp statistics */ 590 u_int32_t tcp_now; /* for RFC 1323 timestamps */ 591 extern int tcp_do_rfc1323; /* enabled/disabled? */ 592 extern int tcp_do_sack; /* SACK enabled/disabled? */ 593 extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */ 594 extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */ 595 extern int tcp_do_newreno; /* Use the New Reno algorithms */ 596 extern int tcp_mssdflt; /* default seg size */ 597 extern int tcp_init_win; /* initial window */ 598 extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */ 599 extern int tcp_compat_42; /* work around ancient broken TCP peers */ 600 extern int tcp_cwm; /* enable Congestion Window Monitoring */ 601 extern int tcp_cwm_burstsize; /* burst size allowed by CWM */ 602 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 603 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 604 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 605 extern int tcp_syn_cache_interval; /* compressed state timer */ 606 extern int tcp_log_refused; /* log refused connections */ 607 608 extern int tcp_rst_ppslim; 609 610 extern int tcp_syn_cache_size; 611 extern struct syn_cache_head tcp_syn_cache[]; 612 extern u_long syn_cache_count; 613 614 #define TCPCTL_VARIABLES { \ 615 { 0 }, \ 616 { 1, 0, &tcp_do_rfc1323 }, \ 617 { 1, 0, &tcp_sendspace }, \ 618 { 1, 0, &tcp_recvspace }, \ 619 { 1, 0, &tcp_mssdflt }, \ 620 { 1, 0, &tcp_syn_cache_limit }, \ 621 { 1, 0, &tcp_syn_bucket_limit }, \ 622 { 1, 0, &tcp_syn_cache_interval }, \ 623 { 1, 0, &tcp_init_win }, \ 624 { 1, 0, &tcp_mss_ifmtu }, \ 625 { 1, 0, &tcp_do_sack }, \ 626 { 1, 0, &tcp_do_win_scale }, \ 627 { 1, 0, &tcp_do_timestamps }, \ 628 { 1, 0, &tcp_compat_42 }, \ 629 { 1, 0, &tcp_cwm }, \ 630 { 1, 0, &tcp_cwm_burstsize }, \ 631 { 1, 0, &tcp_ack_on_push }, \ 632 { 1, 0, &tcp_keepidle }, \ 633 { 1, 0, &tcp_keepintvl }, \ 634 { 1, 0, &tcp_keepcnt }, \ 635 { 1, 1, 0, PR_SLOWHZ }, \ 636 { 1, 0, &tcp_do_newreno }, \ 637 { 1, 0, &tcp_log_refused }, \ 638 { 0 }, \ 639 { 1, 0, &tcp_rst_ppslim }, \ 640 } 641 642 int tcp_attach __P((struct socket *)); 643 void tcp_canceltimers __P((struct tcpcb *)); 644 struct tcpcb * 645 tcp_close __P((struct tcpcb *)); 646 #ifdef INET6 647 void tcp6_ctlinput __P((int, struct sockaddr *, void *)); 648 #endif 649 void *tcp_ctlinput __P((int, struct sockaddr *, void *)); 650 int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 651 struct tcpcb * 652 tcp_disconnect __P((struct tcpcb *)); 653 struct tcpcb * 654 tcp_drop __P((struct tcpcb *, int)); 655 void tcp_dooptions __P((struct tcpcb *, 656 u_char *, int, struct tcphdr *, struct tcp_opt_info *)); 657 void tcp_drain __P((void)); 658 void tcp_established __P((struct tcpcb *)); 659 void tcp_fasttimo __P((void)); 660 void tcp_init __P((void)); 661 #ifdef INET6 662 int tcp6_input __P((struct mbuf **, int *, int)); 663 #endif 664 void tcp_input __P((struct mbuf *, ...)); 665 u_long tcp_mss_to_advertise __P((const struct ifnet *, int)); 666 void tcp_mss_from_peer __P((struct tcpcb *, int)); 667 struct tcpcb * 668 tcp_newtcpcb __P((int, void *)); 669 void tcp_notify __P((struct inpcb *, int)); 670 #ifdef INET6 671 void tcp6_notify __P((struct in6pcb *, int)); 672 #endif 673 u_int tcp_optlen __P((struct tcpcb *)); 674 int tcp_output __P((struct tcpcb *)); 675 void tcp_pulloutofband __P((struct socket *, 676 struct tcphdr *, struct mbuf *, int)); 677 void tcp_quench __P((struct inpcb *, int)); 678 #ifdef INET6 679 void tcp6_quench __P((struct in6pcb *, int)); 680 #endif 681 int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *)); 682 int tcp_respond __P((struct tcpcb *, struct mbuf *, struct mbuf *, 683 struct tcphdr *, tcp_seq, tcp_seq, int)); 684 void tcp_rmx_rtt __P((struct tcpcb *)); 685 void tcp_setpersist __P((struct tcpcb *)); 686 void tcp_slowtimo __P((void)); 687 struct mbuf * 688 tcp_template __P((struct tcpcb *)); 689 struct tcpcb * 690 tcp_timers __P((struct tcpcb *, int)); 691 void tcp_trace __P((int, int, struct tcpcb *, struct mbuf *, int)); 692 struct tcpcb * 693 tcp_usrclosed __P((struct tcpcb *)); 694 int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 695 int tcp_usrreq __P((struct socket *, 696 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 697 void tcp_xmit_timer __P((struct tcpcb *, int)); 698 tcp_seq tcp_new_iss __P((struct tcpcb *, tcp_seq)); 699 tcp_seq tcp_new_iss1 __P((void *, void *, u_int16_t, u_int16_t, size_t, 700 tcp_seq)); 701 702 int syn_cache_add __P((struct sockaddr *, struct sockaddr *, 703 struct tcphdr *, unsigned int, struct socket *, 704 struct mbuf *, u_char *, int, struct tcp_opt_info *)); 705 void syn_cache_unreach __P((struct sockaddr *, struct sockaddr *, 706 struct tcphdr *)); 707 struct socket *syn_cache_get __P((struct sockaddr *, struct sockaddr *, 708 struct tcphdr *, unsigned int, unsigned int, 709 struct socket *so, struct mbuf *)); 710 void syn_cache_init __P((void)); 711 void syn_cache_insert __P((struct syn_cache *, struct tcpcb *)); 712 struct syn_cache *syn_cache_lookup __P((struct sockaddr *, struct sockaddr *, 713 struct syn_cache_head **)); 714 void syn_cache_reset __P((struct sockaddr *, struct sockaddr *, 715 struct tcphdr *)); 716 int syn_cache_respond __P((struct syn_cache *, struct mbuf *)); 717 void syn_cache_timer __P((void)); 718 void syn_cache_cleanup __P((struct tcpcb *)); 719 720 int tcp_newreno __P((struct tcpcb *, struct tcphdr *)); 721 #endif 722 723 #endif /* _NETINET_TCP_VAR_H_ */ 724