tcp_var.h revision 1.73
1 /* $NetBSD: tcp_var.h,v 1.73 2000/07/27 11:34:07 itojun 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 (at) 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 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) && !defined(_LKM) 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_short 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 tcp_seq last_ack_sent; 224 225 /* SACK stuff */ 226 struct ipqehead timeq; /* time sequenced queue (for SACK) */ 227 228 /* pointer for syn cache entries*/ 229 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 230 }; 231 232 #ifdef _KERNEL 233 /* 234 * TCP reassembly queue locks. 235 */ 236 static __inline int tcp_reass_lock_try __P((struct tcpcb *)) 237 __attribute__((__unused__)); 238 static __inline void tcp_reass_unlock __P((struct tcpcb *)) 239 __attribute__((__unused__)); 240 241 static __inline int 242 tcp_reass_lock_try(tp) 243 struct tcpcb *tp; 244 { 245 int s; 246 247 s = splimp(); 248 if (tp->t_flags & TF_REASSEMBLING) { 249 splx(s); 250 return (0); 251 } 252 tp->t_flags |= TF_REASSEMBLING; 253 splx(s); 254 return (1); 255 } 256 257 static __inline void 258 tcp_reass_unlock(tp) 259 struct tcpcb *tp; 260 { 261 int s; 262 263 s = splimp(); 264 tp->t_flags &= ~TF_REASSEMBLING; 265 splx(s); 266 } 267 268 #ifdef DIAGNOSTIC 269 #define TCP_REASS_LOCK(tp) \ 270 do { \ 271 if (tcp_reass_lock_try(tp) == 0) { \ 272 printf("%s:%d: tcpcb %p reass already locked\n", \ 273 __FILE__, __LINE__, tp); \ 274 panic("tcp_reass_lock"); \ 275 } \ 276 } while (0) 277 #define TCP_REASS_LOCK_CHECK(tp) \ 278 do { \ 279 if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \ 280 printf("%s:%d: tcpcb %p reass lock not held\n", \ 281 __FILE__, __LINE__, tp); \ 282 panic("tcp reass lock check"); \ 283 } \ 284 } while (0) 285 #else 286 #define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp)) 287 #define TCP_REASS_LOCK_CHECK(tp) /* nothing */ 288 #endif 289 290 #define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp)) 291 #endif /* _KERNEL */ 292 293 /* 294 * Queue for delayed ACK processing. 295 */ 296 LIST_HEAD(tcp_delack_head, tcpcb); 297 #ifdef _KERNEL 298 extern struct tcp_delack_head tcp_delacks; 299 300 #define TCP_SET_DELACK(tp) \ 301 do { \ 302 if (((tp)->t_flags & TF_DELACK) == 0) { \ 303 (tp)->t_flags |= TF_DELACK; \ 304 LIST_INSERT_HEAD(&tcp_delacks, (tp), t_delack); \ 305 } \ 306 } while (0) 307 308 #define TCP_CLEAR_DELACK(tp) \ 309 do { \ 310 if ((tp)->t_flags & TF_DELACK) { \ 311 (tp)->t_flags &= ~TF_DELACK; \ 312 LIST_REMOVE((tp), t_delack); \ 313 } \ 314 } while (0) 315 #endif /* _KERNEL */ 316 317 /* 318 * Handy way of passing around TCP option info. 319 */ 320 struct tcp_opt_info { 321 int ts_present; 322 u_int32_t ts_val; 323 u_int32_t ts_ecr; 324 u_int16_t maxseg; 325 }; 326 327 /* 328 * Data for the TCP compressed state engine. 329 */ 330 union syn_cache_sa { 331 struct sockaddr sa; 332 struct sockaddr_in sin; 333 #if 1 /*def INET6*/ 334 struct sockaddr_in6 sin6; 335 #endif 336 }; 337 338 struct syn_cache { 339 LIST_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 340 TAILQ_ENTRY(syn_cache) sc_timeq; /* link on timer queue */ 341 union { /* cached route */ 342 struct route route4; 343 #ifdef INET6 344 struct route_in6 route6; 345 #endif 346 } sc_route_u; 347 #define sc_route4 sc_route_u.route4 348 #ifdef INET6 349 #define sc_route6 sc_route_u.route6 350 #endif 351 long sc_win; /* advertised window */ 352 int sc_bucketidx; /* our bucket index */ 353 u_int32_t sc_hash; 354 u_int32_t sc_timestamp; /* timestamp from SYN */ 355 union syn_cache_sa sc_src; 356 union syn_cache_sa sc_dst; 357 tcp_seq sc_irs; 358 tcp_seq sc_iss; 359 u_int sc_rexmt; /* retransmit timer */ 360 u_int sc_rxtcur; /* current rxt timeout */ 361 u_int sc_rxttot; /* total time spend on queues */ 362 u_short sc_rxtshift; /* for computing backoff */ 363 u_short sc_flags; 364 365 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 366 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 367 368 struct mbuf *sc_ipopts; /* IP options */ 369 u_int16_t sc_peermaxseg; 370 u_int16_t sc_ourmaxseg; 371 u_int8_t sc_request_r_scale : 4, 372 sc_requested_s_scale : 4; 373 374 struct tcpcb *sc_tp; /* tcb for listening socket */ 375 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 376 }; 377 378 struct syn_cache_head { 379 LIST_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 380 u_short sch_length; /* # entries in bucket */ 381 }; 382 383 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 384 #ifdef INET6 385 #define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb) 386 #endif 387 #ifndef INET6 388 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 389 #else 390 #define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \ 391 ? intotcpcb(sotoinpcb(so)) \ 392 : in6totcpcb(sotoin6pcb(so))) 393 #endif 394 395 /* 396 * The smoothed round-trip time and estimated variance 397 * are stored as fixed point numbers scaled by the values below. 398 * For convenience, these scales are also used in smoothing the average 399 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 400 * With these scales, srtt has 3 bits to the right of the binary point, 401 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 402 * binary point, and is smoothed with an ALPHA of 0.75. 403 */ 404 #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ 405 #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ 406 407 /* 408 * The initial retransmission should happen at rtt + 4 * rttvar. 409 * Because of the way we do the smoothing, srtt and rttvar 410 * will each average +1/2 tick of bias. When we compute 411 * the retransmit timer, we want 1/2 tick of rounding and 412 * 1 extra tick because of +-1/2 tick uncertainty in the 413 * firing of the timer. The bias will give us exactly the 414 * 1.5 tick we need. But, because the bias is 415 * statistical, we have to test that we don't drop below 416 * the minimum feasible timer (which is 2 ticks). 417 * This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT 418 * is the same as the multiplier for rttvar. 419 */ 420 #define TCP_REXMTVAL(tp) \ 421 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) 422 423 /* 424 * Compute the initial window for slow start. 425 */ 426 #define TCP_INITIAL_WINDOW(iw, segsz) \ 427 (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \ 428 ((segsz) * (iw))) 429 430 /* 431 * TCP statistics. 432 * Many of these should be kept per connection, 433 * but that's inconvenient at the moment. 434 */ 435 struct tcpstat { 436 u_quad_t tcps_connattempt; /* connections initiated */ 437 u_quad_t tcps_accepts; /* connections accepted */ 438 u_quad_t tcps_connects; /* connections established */ 439 u_quad_t tcps_drops; /* connections dropped */ 440 u_quad_t tcps_conndrops; /* embryonic connections dropped */ 441 u_quad_t tcps_closed; /* conn. closed (includes drops) */ 442 u_quad_t tcps_segstimed; /* segs where we tried to get rtt */ 443 u_quad_t tcps_rttupdated; /* times we succeeded */ 444 u_quad_t tcps_delack; /* delayed acks sent */ 445 u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 446 u_quad_t tcps_rexmttimeo; /* retransmit timeouts */ 447 u_quad_t tcps_persisttimeo; /* persist timeouts */ 448 u_quad_t tcps_keeptimeo; /* keepalive timeouts */ 449 u_quad_t tcps_keepprobe; /* keepalive probes sent */ 450 u_quad_t tcps_keepdrops; /* connections dropped in keepalive */ 451 u_quad_t tcps_persistdrops; /* connections dropped in persist */ 452 u_quad_t tcps_connsdrained; /* connections drained due to memory 453 shortage */ 454 455 u_quad_t tcps_sndtotal; /* total packets sent */ 456 u_quad_t tcps_sndpack; /* data packets sent */ 457 u_quad_t tcps_sndbyte; /* data bytes sent */ 458 u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */ 459 u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 460 u_quad_t tcps_sndacks; /* ack-only packets sent */ 461 u_quad_t tcps_sndprobe; /* window probes sent */ 462 u_quad_t tcps_sndurg; /* packets sent with URG only */ 463 u_quad_t tcps_sndwinup; /* window update-only packets sent */ 464 u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 465 466 u_quad_t tcps_rcvtotal; /* total packets received */ 467 u_quad_t tcps_rcvpack; /* packets received in sequence */ 468 u_quad_t tcps_rcvbyte; /* bytes received in sequence */ 469 u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */ 470 u_quad_t tcps_rcvbadoff; /* packets received with bad offset */ 471 u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 472 u_quad_t tcps_rcvshort; /* packets received too short */ 473 u_quad_t tcps_rcvduppack; /* duplicate-only packets received */ 474 u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 475 u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */ 476 u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 477 u_quad_t tcps_rcvoopack; /* out-of-order packets received */ 478 u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */ 479 u_quad_t tcps_rcvpackafterwin; /* packets with data after window */ 480 u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 481 u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */ 482 u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */ 483 u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */ 484 u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 485 u_quad_t tcps_rcvackpack; /* rcvd ack packets */ 486 u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 487 u_quad_t tcps_rcvwinupd; /* rcvd window update packets */ 488 u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */ 489 u_quad_t tcps_predack; /* times hdr predict ok for acks */ 490 u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */ 491 492 u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 493 u_quad_t tcps_noport; /* no socket on port */ 494 u_quad_t tcps_badsyn; /* received ack for which we have 495 no SYN in compressed state */ 496 497 /* These statistics deal with the SYN cache. */ 498 u_quad_t tcps_sc_added; /* # of entries added */ 499 u_quad_t tcps_sc_completed; /* # of connections completed */ 500 u_quad_t tcps_sc_timed_out; /* # of entries timed out */ 501 u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */ 502 u_quad_t tcps_sc_reset; /* # dropped due to RST */ 503 u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 504 u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 505 u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 506 u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 507 u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 508 u_quad_t tcps_sc_collisions; /* # of hash collisions */ 509 u_quad_t tcps_sc_retransmitted; /* # of retransmissions */ 510 }; 511 512 /* 513 * Names for TCP sysctl objects. 514 */ 515 #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */ 516 #define TCPCTL_SENDSPACE 2 /* default send buffer */ 517 #define TCPCTL_RECVSPACE 3 /* default recv buffer */ 518 #define TCPCTL_MSSDFLT 4 /* default seg size */ 519 #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */ 520 #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */ 521 #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */ 522 #define TCPCTL_INIT_WIN 8 /* initial window */ 523 #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */ 524 #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */ 525 #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */ 526 #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */ 527 #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */ 528 #define TCPCTL_CWM 14 /* Congestion Window Monitoring */ 529 #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */ 530 #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */ 531 #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */ 532 #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */ 533 #define TCPCTL_KEEPCNT 19 /* keepalive count */ 534 #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */ 535 #define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */ 536 #define TCPCTL_LOG_REFUSED 22 /* Log refused connections */ 537 #define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */ 538 #define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */ 539 #define TCPCTL_MAXID 25 540 541 #define TCPCTL_NAMES { \ 542 { 0, 0 }, \ 543 { "rfc1323", CTLTYPE_INT }, \ 544 { "sendspace", CTLTYPE_INT }, \ 545 { "recvspace", CTLTYPE_INT }, \ 546 { "mssdflt", CTLTYPE_INT }, \ 547 { "syn_cache_limit", CTLTYPE_INT }, \ 548 { "syn_bucket_limit", CTLTYPE_INT }, \ 549 { "syn_cache_interval", CTLTYPE_INT },\ 550 { "init_win", CTLTYPE_INT }, \ 551 { "mss_ifmtu", CTLTYPE_INT }, \ 552 { "sack", CTLTYPE_INT }, \ 553 { "win_scale", CTLTYPE_INT }, \ 554 { "timestamps", CTLTYPE_INT }, \ 555 { "compat_42", CTLTYPE_INT }, \ 556 { "cwm", CTLTYPE_INT }, \ 557 { "cwm_burstsize", CTLTYPE_INT }, \ 558 { "ack_on_push", CTLTYPE_INT }, \ 559 { "keepidle", CTLTYPE_INT }, \ 560 { "keepintvl", CTLTYPE_INT }, \ 561 { "keepcnt", CTLTYPE_INT }, \ 562 { "slowhz", CTLTYPE_INT }, \ 563 { "newreno", CTLTYPE_INT }, \ 564 { "log_refused",CTLTYPE_INT }, \ 565 { "rstratelimit", CTLTYPE_INT }, \ 566 { "rstppslimit", CTLTYPE_INT }, \ 567 } 568 569 #ifdef _KERNEL 570 struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 571 #ifdef INET6 572 extern struct in6pcb tcb6; 573 #endif 574 struct tcpstat tcpstat; /* tcp statistics */ 575 u_int32_t tcp_now; /* for RFC 1323 timestamps */ 576 extern int tcp_do_rfc1323; /* enabled/disabled? */ 577 extern int tcp_do_sack; /* SACK enabled/disabled? */ 578 extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */ 579 extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */ 580 extern int tcp_do_newreno; /* Use the New Reno algorithms */ 581 extern int tcp_mssdflt; /* default seg size */ 582 extern int tcp_init_win; /* initial window */ 583 extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */ 584 extern int tcp_compat_42; /* work around ancient broken TCP peers */ 585 extern int tcp_cwm; /* enable Congestion Window Monitoring */ 586 extern int tcp_cwm_burstsize; /* burst size allowed by CWM */ 587 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 588 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 589 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 590 extern int tcp_syn_cache_interval; /* compressed state timer */ 591 extern int tcp_log_refused; /* log refused connections */ 592 593 extern struct timeval tcp_rst_ratelim; 594 extern int tcp_rst_ppslim; 595 596 extern int tcp_syn_cache_size; 597 extern struct syn_cache_head tcp_syn_cache[]; 598 extern u_long syn_cache_count; 599 600 #define TCPCTL_VARIABLES { \ 601 { 0 }, \ 602 { 1, 0, &tcp_do_rfc1323 }, \ 603 { 1, 0, &tcp_sendspace }, \ 604 { 1, 0, &tcp_recvspace }, \ 605 { 1, 0, &tcp_mssdflt }, \ 606 { 1, 0, &tcp_syn_cache_limit }, \ 607 { 1, 0, &tcp_syn_bucket_limit }, \ 608 { 1, 0, &tcp_syn_cache_interval }, \ 609 { 1, 0, &tcp_init_win }, \ 610 { 1, 0, &tcp_mss_ifmtu }, \ 611 { 1, 0, &tcp_do_sack }, \ 612 { 1, 0, &tcp_do_win_scale }, \ 613 { 1, 0, &tcp_do_timestamps }, \ 614 { 1, 0, &tcp_compat_42 }, \ 615 { 1, 0, &tcp_cwm }, \ 616 { 1, 0, &tcp_cwm_burstsize }, \ 617 { 1, 0, &tcp_ack_on_push }, \ 618 { 1, 0, &tcp_keepidle }, \ 619 { 1, 0, &tcp_keepintvl }, \ 620 { 1, 0, &tcp_keepcnt }, \ 621 { 1, 1, 0, PR_SLOWHZ }, \ 622 { 1, 0, &tcp_do_newreno }, \ 623 { 1, 0, &tcp_log_refused }, \ 624 { 1, 1, 0, 0 }, \ 625 { 1, 0, &tcp_rst_ppslim }, \ 626 } 627 628 int tcp_attach __P((struct socket *)); 629 void tcp_canceltimers __P((struct tcpcb *)); 630 struct tcpcb * 631 tcp_close __P((struct tcpcb *)); 632 #if defined(INET6) && !defined(TCP6) 633 void tcp6_ctlinput __P((int, struct sockaddr *, void *)); 634 #endif 635 void *tcp_ctlinput __P((int, struct sockaddr *, void *)); 636 int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 637 struct tcpcb * 638 tcp_disconnect __P((struct tcpcb *)); 639 struct tcpcb * 640 tcp_drop __P((struct tcpcb *, int)); 641 void tcp_dooptions __P((struct tcpcb *, 642 u_char *, int, struct tcphdr *, struct tcp_opt_info *)); 643 void tcp_drain __P((void)); 644 void tcp_established __P((struct tcpcb *)); 645 void tcp_fasttimo __P((void)); 646 void tcp_init __P((void)); 647 #if defined(INET6) && !defined(TCP6) 648 int tcp6_input __P((struct mbuf **, int *, int)); 649 #endif 650 void tcp_input __P((struct mbuf *, ...)); 651 u_long tcp_mss_to_advertise __P((const struct ifnet *, int)); 652 void tcp_mss_from_peer __P((struct tcpcb *, int)); 653 void tcp_mtudisc __P((struct inpcb *, int)); 654 #if defined(INET6) && !defined(TCP6) 655 void tcp6_mtudisc __P((struct in6pcb *, int)); 656 #endif 657 struct tcpcb * 658 tcp_newtcpcb __P((int, void *)); 659 void tcp_notify __P((struct inpcb *, int)); 660 #if defined(INET6) && !defined(TCP6) 661 void tcp6_notify __P((struct in6pcb *, int)); 662 #endif 663 u_int tcp_optlen __P((struct tcpcb *)); 664 int tcp_output __P((struct tcpcb *)); 665 void tcp_pulloutofband __P((struct socket *, 666 struct tcphdr *, struct mbuf *, int)); 667 void tcp_quench __P((struct inpcb *, int)); 668 #if defined(INET6) && !defined(TCP6) 669 void tcp6_quench __P((struct in6pcb *, int)); 670 #endif 671 int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *)); 672 int tcp_respond __P((struct tcpcb *, struct mbuf *, struct mbuf *, 673 struct tcphdr *, tcp_seq, tcp_seq, int)); 674 void tcp_rmx_rtt __P((struct tcpcb *)); 675 void tcp_setpersist __P((struct tcpcb *)); 676 void tcp_slowtimo __P((void)); 677 struct mbuf * 678 tcp_template __P((struct tcpcb *)); 679 struct tcpcb * 680 tcp_timers __P((struct tcpcb *, int)); 681 void tcp_trace __P((int, int, struct tcpcb *, struct mbuf *, int)); 682 struct tcpcb * 683 tcp_usrclosed __P((struct tcpcb *)); 684 int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 685 int tcp_usrreq __P((struct socket *, 686 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 687 void tcp_xmit_timer __P((struct tcpcb *, int)); 688 tcp_seq tcp_new_iss __P((void *, u_long, tcp_seq)); 689 690 int syn_cache_add __P((struct sockaddr *, struct sockaddr *, 691 struct tcphdr *, unsigned int, struct socket *, 692 struct mbuf *, u_char *, int, struct tcp_opt_info *)); 693 void syn_cache_unreach __P((struct sockaddr *, struct sockaddr *, 694 struct tcphdr *)); 695 struct socket *syn_cache_get __P((struct sockaddr *, struct sockaddr *, 696 struct tcphdr *, unsigned int, unsigned int, 697 struct socket *so, struct mbuf *)); 698 void syn_cache_init __P((void)); 699 void syn_cache_insert __P((struct syn_cache *, struct tcpcb *)); 700 struct syn_cache *syn_cache_lookup __P((struct sockaddr *, struct sockaddr *, 701 struct syn_cache_head **)); 702 void syn_cache_reset __P((struct sockaddr *, struct sockaddr *, 703 struct tcphdr *)); 704 int syn_cache_respond __P((struct syn_cache *, struct mbuf *)); 705 void syn_cache_timer __P((void)); 706 void syn_cache_cleanup __P((struct tcpcb *)); 707 708 int tcp_newreno __P((struct tcpcb *, struct tcphdr *)); 709 #endif 710 711 #endif /* _NETINET_TCP_VAR_H_ */ 712
Indexes created Mon Sep 22 13:09:51 GMT 2025