tcp_var.h revision 1.72.4.3
1 /* $NetBSD: tcp_var.h,v 1.72.4.3 2004/04/20 20:25:45 jmc Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 34 * 35 * NRL grants permission for redistribution and use in source and binary 36 * forms, with or without modification, of the software and documentation 37 * created at NRL provided that the following conditions are met: 38 * 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 3. All advertising materials mentioning features or use of this software 45 * must display the following acknowledgements: 46 * This product includes software developed by the University of 47 * California, Berkeley and its contributors. 48 * This product includes software developed at the Information 49 * Technology Division, US Naval Research Laboratory. 50 * 4. Neither the name of the NRL nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS 55 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 56 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 57 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR 58 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 59 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 60 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 61 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 62 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 63 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 64 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 65 * 66 * The views and conclusions contained in the software and documentation 67 * are those of the authors and should not be interpreted as representing 68 * official policies, either expressed or implied, of the US Naval 69 * Research Laboratory (NRL). 70 */ 71 72 /*- 73 * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc. 74 * All rights reserved. 75 * 76 * This code is derived from software contributed to The NetBSD Foundation 77 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 78 * NASA Ames Research Center. 79 * 80 * Redistribution and use in source and binary forms, with or without 81 * modification, are permitted provided that the following conditions 82 * are met: 83 * 1. Redistributions of source code must retain the above copyright 84 * notice, this list of conditions and the following disclaimer. 85 * 2. Redistributions in binary form must reproduce the above copyright 86 * notice, this list of conditions and the following disclaimer in the 87 * documentation and/or other materials provided with the distribution. 88 * 3. All advertising materials mentioning features or use of this software 89 * must display the following acknowledgement: 90 * This product includes software developed by the NetBSD 91 * Foundation, Inc. and its contributors. 92 * 4. Neither the name of The NetBSD Foundation nor the names of its 93 * contributors may be used to endorse or promote products derived 94 * from this software without specific prior written permission. 95 * 96 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 97 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 98 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 99 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 100 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 101 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 102 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 103 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 104 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 105 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 106 * POSSIBILITY OF SUCH DAMAGE. 107 */ 108 109 /* 110 * Copyright (c) 1982, 1986, 1993, 1994, 1995 111 * The Regents of the University of California. All rights reserved. 112 * 113 * Redistribution and use in source and binary forms, with or without 114 * modification, are permitted provided that the following conditions 115 * are met: 116 * 1. Redistributions of source code must retain the above copyright 117 * notice, this list of conditions and the following disclaimer. 118 * 2. Redistributions in binary form must reproduce the above copyright 119 * notice, this list of conditions and the following disclaimer in the 120 * documentation and/or other materials provided with the distribution. 121 * 3. All advertising materials mentioning features or use of this software 122 * must display the following acknowledgement: 123 * This product includes software developed by the University of 124 * California, Berkeley and its contributors. 125 * 4. Neither the name of the University nor the names of its contributors 126 * may be used to endorse or promote products derived from this software 127 * without specific prior written permission. 128 * 129 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 130 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 131 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 132 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 133 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 134 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 135 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 136 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 137 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 138 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 139 * SUCH DAMAGE. 140 * 141 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 142 */ 143 144 #ifndef _NETINET_TCP_VAR_H_ 145 #define _NETINET_TCP_VAR_H_ 146 147 #if defined(_KERNEL) && !defined(_LKM) 148 #include "opt_inet.h" 149 #endif 150 151 /* 152 * Kernel variables for tcp. 153 */ 154 155 /* 156 * Tcp control block, one per tcp; fields: 157 */ 158 struct tcpcb { 159 int t_family; /* address family on the wire */ 160 struct ipqehead segq; /* sequencing queue */ 161 u_int t_timer[TCPT_NTIMERS]; /* tcp timers */ 162 short t_state; /* state of this connection */ 163 short t_rxtshift; /* log(2) of rexmt exp. backoff */ 164 short t_rxtcur; /* current retransmit value */ 165 short t_dupacks; /* consecutive dup acks recd */ 166 u_short t_peermss; /* peer's maximum segment size */ 167 u_short t_ourmss; /* our's maximum segment size */ 168 u_short t_segsz; /* current segment size in use */ 169 char t_force; /* 1 if forcing out a byte */ 170 u_short t_flags; 171 #define TF_ACKNOW 0x0001 /* ack peer immediately */ 172 #define TF_DELACK 0x0002 /* ack, but try to delay it */ 173 #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */ 174 #define TF_NOOPT 0x0008 /* don't use tcp options */ 175 #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */ 176 #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */ 177 #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */ 178 #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */ 179 #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */ 180 #define TF_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */ 181 #define TF_WILL_SACK 0x0800 /* try to use SACK */ 182 #define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */ 183 #define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */ 184 #define TF_REASSEMBLING 0x4000 /* we're busy reassembling */ 185 186 187 struct mbuf *t_template; /* skeletal packet for transmit */ 188 struct inpcb *t_inpcb; /* back pointer to internet pcb */ 189 struct in6pcb *t_in6pcb; /* back pointer to internet pcb */ 190 LIST_ENTRY(tcpcb) t_delack; /* delayed ACK queue */ 191 /* 192 * The following fields are used as in the protocol specification. 193 * See RFC783, Dec. 1981, page 21. 194 */ 195 /* send sequence variables */ 196 tcp_seq snd_una; /* send unacknowledged */ 197 tcp_seq snd_nxt; /* send next */ 198 tcp_seq snd_up; /* send urgent pointer */ 199 tcp_seq snd_wl1; /* window update seg seq number */ 200 tcp_seq snd_wl2; /* window update seg ack number */ 201 tcp_seq iss; /* initial send sequence number */ 202 u_long snd_wnd; /* send window */ 203 tcp_seq snd_recover; /* for use in fast recovery */ 204 /* receive sequence variables */ 205 u_long rcv_wnd; /* receive window */ 206 tcp_seq rcv_nxt; /* receive next */ 207 tcp_seq rcv_up; /* receive urgent pointer */ 208 tcp_seq irs; /* initial receive sequence number */ 209 /* 210 * Additional variables for this implementation. 211 */ 212 /* receive variables */ 213 tcp_seq rcv_adv; /* advertised window */ 214 /* retransmit variables */ 215 tcp_seq snd_max; /* highest sequence number sent; 216 * used to recognize retransmits 217 */ 218 /* congestion control (for slow start, source quench, retransmit after loss) */ 219 u_long snd_cwnd; /* congestion-controlled window */ 220 u_long snd_ssthresh; /* snd_cwnd size threshhold for 221 * for slow start exponential to 222 * linear switch 223 */ 224 /* 225 * transmit timing stuff. See below for scale of srtt and rttvar. 226 * "Variance" is actually smoothed difference. 227 */ 228 short t_idle; /* inactivity time */ 229 short t_rtt; /* round trip time */ 230 tcp_seq t_rtseq; /* sequence number being timed */ 231 short t_srtt; /* smoothed round-trip time */ 232 short t_rttvar; /* variance in round-trip time */ 233 short t_rttmin; /* minimum rtt allowed */ 234 u_long max_sndwnd; /* largest window peer has offered */ 235 236 /* out-of-band data */ 237 char t_oobflags; /* have some */ 238 char t_iobc; /* input character */ 239 #define TCPOOB_HAVEDATA 0x01 240 #define TCPOOB_HADDATA 0x02 241 short t_softerror; /* possible error not yet reported */ 242 243 /* RFC 1323 variables */ 244 u_char snd_scale; /* window scaling for send window */ 245 u_char rcv_scale; /* window scaling for recv window */ 246 u_char request_r_scale; /* pending window scaling */ 247 u_char requested_s_scale; 248 u_int32_t ts_recent; /* timestamp echo data */ 249 u_int32_t ts_recent_age; /* when last updated */ 250 tcp_seq last_ack_sent; 251 252 /* SACK stuff */ 253 struct ipqehead timeq; /* time sequenced queue (for SACK) */ 254 255 /* pointer for syn cache entries*/ 256 LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */ 257 }; 258 259 #ifdef _KERNEL 260 /* 261 * TCP reassembly queue locks. 262 */ 263 static __inline int tcp_reass_lock_try __P((struct tcpcb *)) 264 __attribute__((__unused__)); 265 static __inline void tcp_reass_unlock __P((struct tcpcb *)) 266 __attribute__((__unused__)); 267 268 static __inline int 269 tcp_reass_lock_try(tp) 270 struct tcpcb *tp; 271 { 272 int s; 273 274 s = splimp(); 275 if (tp->t_flags & TF_REASSEMBLING) { 276 splx(s); 277 return (0); 278 } 279 tp->t_flags |= TF_REASSEMBLING; 280 splx(s); 281 return (1); 282 } 283 284 static __inline void 285 tcp_reass_unlock(tp) 286 struct tcpcb *tp; 287 { 288 int s; 289 290 s = splimp(); 291 tp->t_flags &= ~TF_REASSEMBLING; 292 splx(s); 293 } 294 295 #ifdef DIAGNOSTIC 296 #define TCP_REASS_LOCK(tp) \ 297 do { \ 298 if (tcp_reass_lock_try(tp) == 0) { \ 299 printf("%s:%d: tcpcb %p reass already locked\n", \ 300 __FILE__, __LINE__, tp); \ 301 panic("tcp_reass_lock"); \ 302 } \ 303 } while (0) 304 #define TCP_REASS_LOCK_CHECK(tp) \ 305 do { \ 306 if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \ 307 printf("%s:%d: tcpcb %p reass lock not held\n", \ 308 __FILE__, __LINE__, tp); \ 309 panic("tcp reass lock check"); \ 310 } \ 311 } while (0) 312 #else 313 #define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp)) 314 #define TCP_REASS_LOCK_CHECK(tp) /* nothing */ 315 #endif 316 317 #define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp)) 318 #endif /* _KERNEL */ 319 320 /* 321 * Queue for delayed ACK processing. 322 */ 323 LIST_HEAD(tcp_delack_head, tcpcb); 324 #ifdef _KERNEL 325 extern struct tcp_delack_head tcp_delacks; 326 327 #define TCP_SET_DELACK(tp) \ 328 do { \ 329 if (((tp)->t_flags & TF_DELACK) == 0) { \ 330 (tp)->t_flags |= TF_DELACK; \ 331 LIST_INSERT_HEAD(&tcp_delacks, (tp), t_delack); \ 332 } \ 333 } while (0) 334 335 #define TCP_CLEAR_DELACK(tp) \ 336 do { \ 337 if ((tp)->t_flags & TF_DELACK) { \ 338 (tp)->t_flags &= ~TF_DELACK; \ 339 LIST_REMOVE((tp), t_delack); \ 340 } \ 341 } while (0) 342 #endif /* _KERNEL */ 343 344 /* 345 * Handy way of passing around TCP option info. 346 */ 347 struct tcp_opt_info { 348 int ts_present; 349 u_int32_t ts_val; 350 u_int32_t ts_ecr; 351 u_int16_t maxseg; 352 }; 353 354 /* 355 * Data for the TCP compressed state engine. 356 */ 357 union syn_cache_sa { 358 struct sockaddr sa; 359 struct sockaddr_in sin; 360 #if 1 /*def INET6*/ 361 struct sockaddr_in6 sin6; 362 #endif 363 }; 364 365 struct syn_cache { 366 LIST_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */ 367 TAILQ_ENTRY(syn_cache) sc_timeq; /* link on timer queue */ 368 union { /* cached route */ 369 struct route route4; 370 #ifdef INET6 371 struct route_in6 route6; 372 #endif 373 } sc_route_u; 374 #define sc_route4 sc_route_u.route4 375 #ifdef INET6 376 #define sc_route6 sc_route_u.route6 377 #endif 378 long sc_win; /* advertised window */ 379 int sc_bucketidx; /* our bucket index */ 380 u_int32_t sc_hash; 381 u_int32_t sc_timestamp; /* timestamp from SYN */ 382 union syn_cache_sa sc_src; 383 union syn_cache_sa sc_dst; 384 tcp_seq sc_irs; 385 tcp_seq sc_iss; 386 u_int sc_rexmt; /* retransmit timer */ 387 u_int sc_rxtcur; /* current rxt timeout */ 388 u_int sc_rxttot; /* total time spend on queues */ 389 u_short sc_rxtshift; /* for computing backoff */ 390 u_short sc_flags; 391 392 #define SCF_UNREACH 0x0001 /* we've had an unreach error */ 393 #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */ 394 395 struct mbuf *sc_ipopts; /* IP options */ 396 u_int16_t sc_peermaxseg; 397 u_int16_t sc_ourmaxseg; 398 u_int8_t sc_request_r_scale : 4, 399 sc_requested_s_scale : 4; 400 401 struct tcpcb *sc_tp; /* tcb for listening socket */ 402 LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */ 403 }; 404 405 struct syn_cache_head { 406 LIST_HEAD(, syn_cache) sch_bucket; /* bucket entries */ 407 u_short sch_length; /* # entries in bucket */ 408 }; 409 410 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 411 #ifdef INET6 412 #define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb) 413 #endif 414 #ifndef INET6 415 #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 416 #else 417 #define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \ 418 ? intotcpcb(sotoinpcb(so)) \ 419 : in6totcpcb(sotoin6pcb(so))) 420 #endif 421 422 /* 423 * The smoothed round-trip time and estimated variance 424 * are stored as fixed point numbers scaled by the values below. 425 * For convenience, these scales are also used in smoothing the average 426 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed). 427 * With these scales, srtt has 3 bits to the right of the binary point, 428 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the 429 * binary point, and is smoothed with an ALPHA of 0.75. 430 */ 431 #define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */ 432 #define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */ 433 434 /* 435 * The initial retransmission should happen at rtt + 4 * rttvar. 436 * Because of the way we do the smoothing, srtt and rttvar 437 * will each average +1/2 tick of bias. When we compute 438 * the retransmit timer, we want 1/2 tick of rounding and 439 * 1 extra tick because of +-1/2 tick uncertainty in the 440 * firing of the timer. The bias will give us exactly the 441 * 1.5 tick we need. But, because the bias is 442 * statistical, we have to test that we don't drop below 443 * the minimum feasible timer (which is 2 ticks). 444 * This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT 445 * is the same as the multiplier for rttvar. 446 */ 447 #define TCP_REXMTVAL(tp) \ 448 ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2) 449 450 /* 451 * Compute the initial window for slow start. 452 */ 453 #define TCP_INITIAL_WINDOW(iw, segsz) \ 454 (((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \ 455 ((segsz) * (iw))) 456 457 /* 458 * TCP statistics. 459 * Many of these should be kept per connection, 460 * but that's inconvenient at the moment. 461 */ 462 struct tcpstat { 463 u_quad_t tcps_connattempt; /* connections initiated */ 464 u_quad_t tcps_accepts; /* connections accepted */ 465 u_quad_t tcps_connects; /* connections established */ 466 u_quad_t tcps_drops; /* connections dropped */ 467 u_quad_t tcps_conndrops; /* embryonic connections dropped */ 468 u_quad_t tcps_closed; /* conn. closed (includes drops) */ 469 u_quad_t tcps_segstimed; /* segs where we tried to get rtt */ 470 u_quad_t tcps_rttupdated; /* times we succeeded */ 471 u_quad_t tcps_delack; /* delayed acks sent */ 472 u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */ 473 u_quad_t tcps_rexmttimeo; /* retransmit timeouts */ 474 u_quad_t tcps_persisttimeo; /* persist timeouts */ 475 u_quad_t tcps_keeptimeo; /* keepalive timeouts */ 476 u_quad_t tcps_keepprobe; /* keepalive probes sent */ 477 u_quad_t tcps_keepdrops; /* connections dropped in keepalive */ 478 u_quad_t tcps_persistdrops; /* connections dropped in persist */ 479 u_quad_t tcps_connsdrained; /* connections drained due to memory 480 shortage */ 481 482 u_quad_t tcps_sndtotal; /* total packets sent */ 483 u_quad_t tcps_sndpack; /* data packets sent */ 484 u_quad_t tcps_sndbyte; /* data bytes sent */ 485 u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */ 486 u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */ 487 u_quad_t tcps_sndacks; /* ack-only packets sent */ 488 u_quad_t tcps_sndprobe; /* window probes sent */ 489 u_quad_t tcps_sndurg; /* packets sent with URG only */ 490 u_quad_t tcps_sndwinup; /* window update-only packets sent */ 491 u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */ 492 493 u_quad_t tcps_rcvtotal; /* total packets received */ 494 u_quad_t tcps_rcvpack; /* packets received in sequence */ 495 u_quad_t tcps_rcvbyte; /* bytes received in sequence */ 496 u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */ 497 u_quad_t tcps_rcvbadoff; /* packets received with bad offset */ 498 u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */ 499 u_quad_t tcps_rcvshort; /* packets received too short */ 500 u_quad_t tcps_rcvduppack; /* duplicate-only packets received */ 501 u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */ 502 u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */ 503 u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */ 504 u_quad_t tcps_rcvoopack; /* out-of-order packets received */ 505 u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */ 506 u_quad_t tcps_rcvpackafterwin; /* packets with data after window */ 507 u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */ 508 u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */ 509 u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */ 510 u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */ 511 u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */ 512 u_quad_t tcps_rcvackpack; /* rcvd ack packets */ 513 u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */ 514 u_quad_t tcps_rcvwinupd; /* rcvd window update packets */ 515 u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */ 516 u_quad_t tcps_predack; /* times hdr predict ok for acks */ 517 u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */ 518 519 u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */ 520 u_quad_t tcps_noport; /* no socket on port */ 521 u_quad_t tcps_badsyn; /* received ack for which we have 522 no SYN in compressed state */ 523 524 /* These statistics deal with the SYN cache. */ 525 u_quad_t tcps_sc_added; /* # of entries added */ 526 u_quad_t tcps_sc_completed; /* # of connections completed */ 527 u_quad_t tcps_sc_timed_out; /* # of entries timed out */ 528 u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */ 529 u_quad_t tcps_sc_reset; /* # dropped due to RST */ 530 u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */ 531 u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */ 532 u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */ 533 u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */ 534 u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */ 535 u_quad_t tcps_sc_collisions; /* # of hash collisions */ 536 u_quad_t tcps_sc_retransmitted; /* # of retransmissions */ 537 }; 538 539 /* 540 * Names for TCP sysctl objects. 541 */ 542 #define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */ 543 #define TCPCTL_SENDSPACE 2 /* default send buffer */ 544 #define TCPCTL_RECVSPACE 3 /* default recv buffer */ 545 #define TCPCTL_MSSDFLT 4 /* default seg size */ 546 #define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */ 547 #define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */ 548 #define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */ 549 #define TCPCTL_INIT_WIN 8 /* initial window */ 550 #define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */ 551 #define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */ 552 #define TCPCTL_WSCALE 11 /* RFC1323 window scaling */ 553 #define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */ 554 #define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */ 555 #define TCPCTL_CWM 14 /* Congestion Window Monitoring */ 556 #define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */ 557 #define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */ 558 #define TCPCTL_KEEPIDLE 17 /* keepalive idle time */ 559 #define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */ 560 #define TCPCTL_KEEPCNT 19 /* keepalive count */ 561 #define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */ 562 #define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */ 563 #define TCPCTL_LOG_REFUSED 22 /* Log refused connections */ 564 #if 0 /*obsoleted*/ 565 #define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */ 566 #endif 567 #define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */ 568 #define TCPCTL_ACKDROPRATELIMIT 28 /* SYN/RST -> ACK rate limit */ 569 #define TCPCTL_MAXID 29 570 571 #define TCPCTL_NAMES { \ 572 { 0, 0 }, \ 573 { "rfc1323", CTLTYPE_INT }, \ 574 { "sendspace", CTLTYPE_INT }, \ 575 { "recvspace", CTLTYPE_INT }, \ 576 { "mssdflt", CTLTYPE_INT }, \ 577 { "syn_cache_limit", CTLTYPE_INT }, \ 578 { "syn_bucket_limit", CTLTYPE_INT }, \ 579 { "syn_cache_interval", CTLTYPE_INT },\ 580 { "init_win", CTLTYPE_INT }, \ 581 { "mss_ifmtu", CTLTYPE_INT }, \ 582 { "sack", CTLTYPE_INT }, \ 583 { "win_scale", CTLTYPE_INT }, \ 584 { "timestamps", CTLTYPE_INT }, \ 585 { "compat_42", CTLTYPE_INT }, \ 586 { "cwm", CTLTYPE_INT }, \ 587 { "cwm_burstsize", CTLTYPE_INT }, \ 588 { "ack_on_push", CTLTYPE_INT }, \ 589 { "keepidle", CTLTYPE_INT }, \ 590 { "keepintvl", CTLTYPE_INT }, \ 591 { "keepcnt", CTLTYPE_INT }, \ 592 { "slowhz", CTLTYPE_INT }, \ 593 { "newreno", CTLTYPE_INT }, \ 594 { "log_refused",CTLTYPE_INT }, \ 595 { 0, 0 }, \ 596 { "rstppslimit", CTLTYPE_INT }, \ 597 { 0, 0 }, \ 598 { 0, 0 }, \ 599 { 0, 0 }, \ 600 { "ackdropppslimit", CTLTYPE_INT }, \ 601 } 602 603 #ifdef _KERNEL 604 struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 605 #ifdef INET6 606 extern struct in6pcb tcb6; 607 #endif 608 struct tcpstat tcpstat; /* tcp statistics */ 609 u_int32_t tcp_now; /* for RFC 1323 timestamps */ 610 extern int tcp_do_rfc1323; /* enabled/disabled? */ 611 extern int tcp_do_sack; /* SACK enabled/disabled? */ 612 extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */ 613 extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */ 614 extern int tcp_do_newreno; /* Use the New Reno algorithms */ 615 extern int tcp_mssdflt; /* default seg size */ 616 extern int tcp_init_win; /* initial window */ 617 extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */ 618 extern int tcp_compat_42; /* work around ancient broken TCP peers */ 619 extern int tcp_cwm; /* enable Congestion Window Monitoring */ 620 extern int tcp_cwm_burstsize; /* burst size allowed by CWM */ 621 extern int tcp_ack_on_push; /* ACK immediately on PUSH */ 622 extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ 623 extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ 624 extern int tcp_syn_cache_interval; /* compressed state timer */ 625 extern int tcp_log_refused; /* log refused connections */ 626 627 extern int tcp_rst_ppslim; 628 extern int tcp_ackdrop_ppslim; 629 630 extern int tcp_syn_cache_size; 631 extern struct syn_cache_head tcp_syn_cache[]; 632 extern u_long syn_cache_count; 633 634 #define TCPCTL_VARIABLES { \ 635 { 0 }, \ 636 { 1, 0, &tcp_do_rfc1323 }, \ 637 { 1, 0, &tcp_sendspace }, \ 638 { 1, 0, &tcp_recvspace }, \ 639 { 1, 0, &tcp_mssdflt }, \ 640 { 1, 0, &tcp_syn_cache_limit }, \ 641 { 1, 0, &tcp_syn_bucket_limit }, \ 642 { 1, 0, &tcp_syn_cache_interval }, \ 643 { 1, 0, &tcp_init_win }, \ 644 { 1, 0, &tcp_mss_ifmtu }, \ 645 { 1, 0, &tcp_do_sack }, \ 646 { 1, 0, &tcp_do_win_scale }, \ 647 { 1, 0, &tcp_do_timestamps }, \ 648 { 1, 0, &tcp_compat_42 }, \ 649 { 1, 0, &tcp_cwm }, \ 650 { 1, 0, &tcp_cwm_burstsize }, \ 651 { 1, 0, &tcp_ack_on_push }, \ 652 { 1, 0, &tcp_keepidle }, \ 653 { 1, 0, &tcp_keepintvl }, \ 654 { 1, 0, &tcp_keepcnt }, \ 655 { 1, 1, 0, PR_SLOWHZ }, \ 656 { 1, 0, &tcp_do_newreno }, \ 657 { 1, 0, &tcp_log_refused }, \ 658 { 0 }, \ 659 { 1, 0, &tcp_rst_ppslim }, \ 660 { 0 }, \ 661 { 0 }, \ 662 { 0 }, \ 663 { 1, 0, &tcp_ackdrop_ppslim }, \ 664 } 665 666 int tcp_attach __P((struct socket *)); 667 void tcp_canceltimers __P((struct tcpcb *)); 668 struct tcpcb * 669 tcp_close __P((struct tcpcb *)); 670 #if defined(INET6) && !defined(TCP6) 671 void tcp6_ctlinput __P((int, struct sockaddr *, void *)); 672 #endif 673 void *tcp_ctlinput __P((int, struct sockaddr *, void *)); 674 int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **)); 675 struct tcpcb * 676 tcp_disconnect __P((struct tcpcb *)); 677 struct tcpcb * 678 tcp_drop __P((struct tcpcb *, int)); 679 void tcp_dooptions __P((struct tcpcb *, 680 u_char *, int, struct tcphdr *, struct tcp_opt_info *)); 681 void tcp_drain __P((void)); 682 void tcp_established __P((struct tcpcb *)); 683 void tcp_fasttimo __P((void)); 684 void tcp_init __P((void)); 685 #if defined(INET6) && !defined(TCP6) 686 int tcp6_input __P((struct mbuf **, int *, int)); 687 #endif 688 void tcp_input __P((struct mbuf *, ...)); 689 u_long tcp_mss_to_advertise __P((const struct ifnet *, int)); 690 void tcp_mss_from_peer __P((struct tcpcb *, int)); 691 void tcp_mtudisc __P((struct inpcb *, int)); 692 #if defined(INET6) && !defined(TCP6) 693 void tcp6_mtudisc __P((struct in6pcb *, int)); 694 #endif 695 struct tcpcb * 696 tcp_newtcpcb __P((int, void *)); 697 void tcp_notify __P((struct inpcb *, int)); 698 #if defined(INET6) && !defined(TCP6) 699 void tcp6_notify __P((struct in6pcb *, int)); 700 #endif 701 u_int tcp_optlen __P((struct tcpcb *)); 702 int tcp_output __P((struct tcpcb *)); 703 void tcp_pulloutofband __P((struct socket *, 704 struct tcphdr *, struct mbuf *, int)); 705 void tcp_quench __P((struct inpcb *, int)); 706 #if defined(INET6) && !defined(TCP6) 707 void tcp6_quench __P((struct in6pcb *, int)); 708 #endif 709 int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *)); 710 int tcp_respond __P((struct tcpcb *, struct mbuf *, struct mbuf *, 711 struct tcphdr *, tcp_seq, tcp_seq, int)); 712 void tcp_rmx_rtt __P((struct tcpcb *)); 713 void tcp_setpersist __P((struct tcpcb *)); 714 void tcp_slowtimo __P((void)); 715 struct mbuf * 716 tcp_template __P((struct tcpcb *)); 717 struct tcpcb * 718 tcp_timers __P((struct tcpcb *, int)); 719 void tcp_trace __P((int, int, struct tcpcb *, struct mbuf *, int)); 720 struct tcpcb * 721 tcp_usrclosed __P((struct tcpcb *)); 722 int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t)); 723 int tcp_usrreq __P((struct socket *, 724 int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *)); 725 void tcp_xmit_timer __P((struct tcpcb *, int)); 726 tcp_seq tcp_new_iss __P((void *, u_long, tcp_seq)); 727 728 int syn_cache_add __P((struct sockaddr *, struct sockaddr *, 729 struct tcphdr *, unsigned int, struct socket *, 730 struct mbuf *, u_char *, int, struct tcp_opt_info *)); 731 void syn_cache_unreach __P((struct sockaddr *, struct sockaddr *, 732 struct tcphdr *)); 733 struct socket *syn_cache_get __P((struct sockaddr *, struct sockaddr *, 734 struct tcphdr *, unsigned int, unsigned int, 735 struct socket *so, struct mbuf *)); 736 void syn_cache_init __P((void)); 737 void syn_cache_insert __P((struct syn_cache *, struct tcpcb *)); 738 struct syn_cache *syn_cache_lookup __P((struct sockaddr *, struct sockaddr *, 739 struct syn_cache_head **)); 740 void syn_cache_reset __P((struct sockaddr *, struct sockaddr *, 741 struct tcphdr *)); 742 int syn_cache_respond __P((struct syn_cache *, struct mbuf *)); 743 void syn_cache_timer __P((void)); 744 void syn_cache_cleanup __P((struct tcpcb *)); 745 746 int tcp_newreno __P((struct tcpcb *, struct tcphdr *)); 747 #endif 748 749 #endif /* _NETINET_TCP_VAR_H_ */ 750
Indexes created Mon Sep 29 03:10:08 GMT 2025