tcp_subr.c revision 1.244
1 /* $NetBSD: tcp_subr.c,v 1.244 2011/12/17 20:05:39 tls 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 (c) 1997, 1998, 2000, 2001, 2008 The NetBSD Foundation, Inc. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to The NetBSD Foundation 37 * by Jason R. Thorpe and Kevin M. Lahey of the Numerical Aerospace Simulation 38 * Facility, NASA Ames Research Center. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 52 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 59 * POSSIBILITY OF SUCH DAMAGE. 60 */ 61 62 /* 63 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 64 * The Regents of the University of California. All rights reserved. 65 * 66 * Redistribution and use in source and binary forms, with or without 67 * modification, are permitted provided that the following conditions 68 * are met: 69 * 1. Redistributions of source code must retain the above copyright 70 * notice, this list of conditions and the following disclaimer. 71 * 2. Redistributions in binary form must reproduce the above copyright 72 * notice, this list of conditions and the following disclaimer in the 73 * documentation and/or other materials provided with the distribution. 74 * 3. Neither the name of the University nor the names of its contributors 75 * may be used to endorse or promote products derived from this software 76 * without specific prior written permission. 77 * 78 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 79 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 80 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 81 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 82 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 83 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 84 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 85 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 86 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 87 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 88 * SUCH DAMAGE. 89 * 90 * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95 91 */ 92 93 #include <sys/cdefs.h> 94 __KERNEL_RCSID(0, "$NetBSD: tcp_subr.c,v 1.244 2011/12/17 20:05:39 tls Exp $"); 95 96 #include "opt_inet.h" 97 #include "opt_ipsec.h" 98 #include "opt_tcp_compat_42.h" 99 #include "opt_inet_csum.h" 100 #include "opt_mbuftrace.h" 101 102 #include <sys/param.h> 103 #include <sys/proc.h> 104 #include <sys/systm.h> 105 #include <sys/malloc.h> 106 #include <sys/mbuf.h> 107 #include <sys/socket.h> 108 #include <sys/socketvar.h> 109 #include <sys/protosw.h> 110 #include <sys/errno.h> 111 #include <sys/kernel.h> 112 #include <sys/pool.h> 113 #include <sys/md5.h> 114 #include <sys/cprng.h> 115 116 #include <net/route.h> 117 #include <net/if.h> 118 119 #include <netinet/in.h> 120 #include <netinet/in_systm.h> 121 #include <netinet/ip.h> 122 #include <netinet/in_pcb.h> 123 #include <netinet/ip_var.h> 124 #include <netinet/ip_icmp.h> 125 126 #ifdef INET6 127 #ifndef INET 128 #include <netinet/in.h> 129 #endif 130 #include <netinet/ip6.h> 131 #include <netinet6/in6_pcb.h> 132 #include <netinet6/ip6_var.h> 133 #include <netinet6/in6_var.h> 134 #include <netinet6/ip6protosw.h> 135 #include <netinet/icmp6.h> 136 #include <netinet6/nd6.h> 137 #endif 138 139 #include <netinet/tcp.h> 140 #include <netinet/tcp_fsm.h> 141 #include <netinet/tcp_seq.h> 142 #include <netinet/tcp_timer.h> 143 #include <netinet/tcp_var.h> 144 #include <netinet/tcp_vtw.h> 145 #include <netinet/tcp_private.h> 146 #include <netinet/tcp_congctl.h> 147 #include <netinet/tcpip.h> 148 149 #ifdef IPSEC 150 #include <netinet6/ipsec.h> 151 #include <netkey/key.h> 152 #endif /*IPSEC*/ 153 154 #ifdef FAST_IPSEC 155 #include <netipsec/ipsec.h> 156 #include <netipsec/xform.h> 157 #ifdef INET6 158 #include <netipsec/ipsec6.h> 159 #endif 160 #include <netipsec/key.h> 161 #endif /* FAST_IPSEC*/ 162 163 164 struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ 165 u_int32_t tcp_now; /* slow ticks, for RFC 1323 timestamps */ 166 167 percpu_t *tcpstat_percpu; 168 169 /* patchable/settable parameters for tcp */ 170 int tcp_mssdflt = TCP_MSS; 171 int tcp_minmss = TCP_MINMSS; 172 int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ; 173 int tcp_do_rfc1323 = 1; /* window scaling / timestamps (obsolete) */ 174 int tcp_do_rfc1948 = 0; /* ISS by cryptographic hash */ 175 int tcp_do_sack = 1; /* selective acknowledgement */ 176 int tcp_do_win_scale = 1; /* RFC1323 window scaling */ 177 int tcp_do_timestamps = 1; /* RFC1323 timestamps */ 178 int tcp_ack_on_push = 0; /* set to enable immediate ACK-on-PUSH */ 179 int tcp_do_ecn = 0; /* Explicit Congestion Notification */ 180 #ifndef TCP_INIT_WIN 181 #define TCP_INIT_WIN 0 /* initial slow start window */ 182 #endif 183 #ifndef TCP_INIT_WIN_LOCAL 184 #define TCP_INIT_WIN_LOCAL 4 /* initial slow start window for local nets */ 185 #endif 186 int tcp_init_win = TCP_INIT_WIN; 187 int tcp_init_win_local = TCP_INIT_WIN_LOCAL; 188 int tcp_mss_ifmtu = 0; 189 #ifdef TCP_COMPAT_42 190 int tcp_compat_42 = 1; 191 #else 192 int tcp_compat_42 = 0; 193 #endif 194 int tcp_rst_ppslim = 100; /* 100pps */ 195 int tcp_ackdrop_ppslim = 100; /* 100pps */ 196 int tcp_do_loopback_cksum = 0; 197 int tcp_do_abc = 1; /* RFC3465 Appropriate byte counting. */ 198 int tcp_abc_aggressive = 1; /* 1: L=2*SMSS 0: L=1*SMSS */ 199 int tcp_sack_tp_maxholes = 32; 200 int tcp_sack_globalmaxholes = 1024; 201 int tcp_sack_globalholes = 0; 202 int tcp_ecn_maxretries = 1; 203 int tcp_msl_enable = 1; /* enable TIME_WAIT truncation */ 204 int tcp_msl_loop = PR_SLOWHZ; /* MSL for loopback */ 205 int tcp_msl_local = 5 * PR_SLOWHZ; /* MSL for 'local' */ 206 int tcp_msl_remote = TCPTV_MSL; /* MSL otherwise */ 207 int tcp_msl_remote_threshold = TCPTV_SRTTDFLT; /* RTT threshold */ 208 int tcp_rttlocal = 0; /* Use RTT to decide who's 'local' */ 209 210 int tcp4_vtw_enable = 0; /* 1 to enable */ 211 int tcp6_vtw_enable = 0; /* 1 to enable */ 212 int tcp_vtw_was_enabled = 0; 213 int tcp_vtw_entries = 1 << 16; /* 64K vestigial TIME_WAIT entries */ 214 215 /* tcb hash */ 216 #ifndef TCBHASHSIZE 217 #define TCBHASHSIZE 128 218 #endif 219 int tcbhashsize = TCBHASHSIZE; 220 221 /* syn hash parameters */ 222 #define TCP_SYN_HASH_SIZE 293 223 #define TCP_SYN_BUCKET_SIZE 35 224 int tcp_syn_cache_size = TCP_SYN_HASH_SIZE; 225 int tcp_syn_cache_limit = TCP_SYN_HASH_SIZE*TCP_SYN_BUCKET_SIZE; 226 int tcp_syn_bucket_limit = 3*TCP_SYN_BUCKET_SIZE; 227 struct syn_cache_head tcp_syn_cache[TCP_SYN_HASH_SIZE]; 228 229 int tcp_freeq(struct tcpcb *); 230 231 #ifdef INET 232 void tcp_mtudisc_callback(struct in_addr); 233 #endif 234 #ifdef INET6 235 void tcp6_mtudisc_callback(struct in6_addr *); 236 #endif 237 238 #ifdef INET6 239 void tcp6_mtudisc(struct in6pcb *, int); 240 #endif 241 242 static struct pool tcpcb_pool; 243 244 static int tcp_drainwanted; 245 246 #ifdef TCP_CSUM_COUNTERS 247 #include <sys/device.h> 248 249 #if defined(INET) 250 struct evcnt tcp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 251 NULL, "tcp", "hwcsum bad"); 252 struct evcnt tcp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 253 NULL, "tcp", "hwcsum ok"); 254 struct evcnt tcp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 255 NULL, "tcp", "hwcsum data"); 256 struct evcnt tcp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 257 NULL, "tcp", "swcsum"); 258 259 EVCNT_ATTACH_STATIC(tcp_hwcsum_bad); 260 EVCNT_ATTACH_STATIC(tcp_hwcsum_ok); 261 EVCNT_ATTACH_STATIC(tcp_hwcsum_data); 262 EVCNT_ATTACH_STATIC(tcp_swcsum); 263 #endif /* defined(INET) */ 264 265 #if defined(INET6) 266 struct evcnt tcp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 267 NULL, "tcp6", "hwcsum bad"); 268 struct evcnt tcp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 269 NULL, "tcp6", "hwcsum ok"); 270 struct evcnt tcp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 271 NULL, "tcp6", "hwcsum data"); 272 struct evcnt tcp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 273 NULL, "tcp6", "swcsum"); 274 275 EVCNT_ATTACH_STATIC(tcp6_hwcsum_bad); 276 EVCNT_ATTACH_STATIC(tcp6_hwcsum_ok); 277 EVCNT_ATTACH_STATIC(tcp6_hwcsum_data); 278 EVCNT_ATTACH_STATIC(tcp6_swcsum); 279 #endif /* defined(INET6) */ 280 #endif /* TCP_CSUM_COUNTERS */ 281 282 283 #ifdef TCP_OUTPUT_COUNTERS 284 #include <sys/device.h> 285 286 struct evcnt tcp_output_bigheader = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 287 NULL, "tcp", "output big header"); 288 struct evcnt tcp_output_predict_hit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 289 NULL, "tcp", "output predict hit"); 290 struct evcnt tcp_output_predict_miss = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 291 NULL, "tcp", "output predict miss"); 292 struct evcnt tcp_output_copysmall = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 293 NULL, "tcp", "output copy small"); 294 struct evcnt tcp_output_copybig = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 295 NULL, "tcp", "output copy big"); 296 struct evcnt tcp_output_refbig = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 297 NULL, "tcp", "output reference big"); 298 299 EVCNT_ATTACH_STATIC(tcp_output_bigheader); 300 EVCNT_ATTACH_STATIC(tcp_output_predict_hit); 301 EVCNT_ATTACH_STATIC(tcp_output_predict_miss); 302 EVCNT_ATTACH_STATIC(tcp_output_copysmall); 303 EVCNT_ATTACH_STATIC(tcp_output_copybig); 304 EVCNT_ATTACH_STATIC(tcp_output_refbig); 305 306 #endif /* TCP_OUTPUT_COUNTERS */ 307 308 #ifdef TCP_REASS_COUNTERS 309 #include <sys/device.h> 310 311 struct evcnt tcp_reass_ = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 312 NULL, "tcp_reass", "calls"); 313 struct evcnt tcp_reass_empty = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 314 &tcp_reass_, "tcp_reass", "insert into empty queue"); 315 struct evcnt tcp_reass_iteration[8] = { 316 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass", ">7 iterations"), 317 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass", "1 iteration"), 318 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass", "2 iterations"), 319 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass", "3 iterations"), 320 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass", "4 iterations"), 321 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass", "5 iterations"), 322 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass", "6 iterations"), 323 EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass", "7 iterations"), 324 }; 325 struct evcnt tcp_reass_prependfirst = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 326 &tcp_reass_, "tcp_reass", "prepend to first"); 327 struct evcnt tcp_reass_prepend = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 328 &tcp_reass_, "tcp_reass", "prepend"); 329 struct evcnt tcp_reass_insert = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 330 &tcp_reass_, "tcp_reass", "insert"); 331 struct evcnt tcp_reass_inserttail = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 332 &tcp_reass_, "tcp_reass", "insert at tail"); 333 struct evcnt tcp_reass_append = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 334 &tcp_reass_, "tcp_reass", "append"); 335 struct evcnt tcp_reass_appendtail = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 336 &tcp_reass_, "tcp_reass", "append to tail fragment"); 337 struct evcnt tcp_reass_overlaptail = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 338 &tcp_reass_, "tcp_reass", "overlap at end"); 339 struct evcnt tcp_reass_overlapfront = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 340 &tcp_reass_, "tcp_reass", "overlap at start"); 341 struct evcnt tcp_reass_segdup = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 342 &tcp_reass_, "tcp_reass", "duplicate segment"); 343 struct evcnt tcp_reass_fragdup = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, 344 &tcp_reass_, "tcp_reass", "duplicate fragment"); 345 346 EVCNT_ATTACH_STATIC(tcp_reass_); 347 EVCNT_ATTACH_STATIC(tcp_reass_empty); 348 EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 0); 349 EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 1); 350 EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 2); 351 EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 3); 352 EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 4); 353 EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 5); 354 EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 6); 355 EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 7); 356 EVCNT_ATTACH_STATIC(tcp_reass_prependfirst); 357 EVCNT_ATTACH_STATIC(tcp_reass_prepend); 358 EVCNT_ATTACH_STATIC(tcp_reass_insert); 359 EVCNT_ATTACH_STATIC(tcp_reass_inserttail); 360 EVCNT_ATTACH_STATIC(tcp_reass_append); 361 EVCNT_ATTACH_STATIC(tcp_reass_appendtail); 362 EVCNT_ATTACH_STATIC(tcp_reass_overlaptail); 363 EVCNT_ATTACH_STATIC(tcp_reass_overlapfront); 364 EVCNT_ATTACH_STATIC(tcp_reass_segdup); 365 EVCNT_ATTACH_STATIC(tcp_reass_fragdup); 366 367 #endif /* TCP_REASS_COUNTERS */ 368 369 #ifdef MBUFTRACE 370 struct mowner tcp_mowner = MOWNER_INIT("tcp", ""); 371 struct mowner tcp_rx_mowner = MOWNER_INIT("tcp", "rx"); 372 struct mowner tcp_tx_mowner = MOWNER_INIT("tcp", "tx"); 373 struct mowner tcp_sock_mowner = MOWNER_INIT("tcp", "sock"); 374 struct mowner tcp_sock_rx_mowner = MOWNER_INIT("tcp", "sock rx"); 375 struct mowner tcp_sock_tx_mowner = MOWNER_INIT("tcp", "sock tx"); 376 #endif 377 378 /* 379 * Tcp initialization 380 */ 381 void 382 tcp_init(void) 383 { 384 int hlen; 385 386 in_pcbinit(&tcbtable, tcbhashsize, tcbhashsize); 387 pool_init(&tcpcb_pool, sizeof(struct tcpcb), 0, 0, 0, "tcpcbpl", 388 NULL, IPL_SOFTNET); 389 390 hlen = sizeof(struct ip) + sizeof(struct tcphdr); 391 #ifdef INET6 392 if (sizeof(struct ip) < sizeof(struct ip6_hdr)) 393 hlen = sizeof(struct ip6_hdr) + sizeof(struct tcphdr); 394 #endif 395 if (max_protohdr < hlen) 396 max_protohdr = hlen; 397 if (max_linkhdr + hlen > MHLEN) 398 panic("tcp_init"); 399 400 #ifdef INET 401 icmp_mtudisc_callback_register(tcp_mtudisc_callback); 402 #endif 403 #ifdef INET6 404 icmp6_mtudisc_callback_register(tcp6_mtudisc_callback); 405 #endif 406 407 tcp_usrreq_init(); 408 409 /* Initialize timer state. */ 410 tcp_timer_init(); 411 412 /* Initialize the compressed state engine. */ 413 syn_cache_init(); 414 415 /* Initialize the congestion control algorithms. */ 416 tcp_congctl_init(); 417 418 /* Initialize the TCPCB template. */ 419 tcp_tcpcb_template(); 420 421 /* Initialize reassembly queue */ 422 tcpipqent_init(); 423 424 /* SACK */ 425 tcp_sack_init(); 426 427 MOWNER_ATTACH(&tcp_tx_mowner); 428 MOWNER_ATTACH(&tcp_rx_mowner); 429 MOWNER_ATTACH(&tcp_reass_mowner); 430 MOWNER_ATTACH(&tcp_sock_mowner); 431 MOWNER_ATTACH(&tcp_sock_tx_mowner); 432 MOWNER_ATTACH(&tcp_sock_rx_mowner); 433 MOWNER_ATTACH(&tcp_mowner); 434 435 tcpstat_percpu = percpu_alloc(sizeof(uint64_t) * TCP_NSTATS); 436 437 vtw_earlyinit(); 438 } 439 440 /* 441 * Create template to be used to send tcp packets on a connection. 442 * Call after host entry created, allocates an mbuf and fills 443 * in a skeletal tcp/ip header, minimizing the amount of work 444 * necessary when the connection is used. 445 */ 446 struct mbuf * 447 tcp_template(struct tcpcb *tp) 448 { 449 struct inpcb *inp = tp->t_inpcb; 450 #ifdef INET6 451 struct in6pcb *in6p = tp->t_in6pcb; 452 #endif 453 struct tcphdr *n; 454 struct mbuf *m; 455 int hlen; 456 457 switch (tp->t_family) { 458 case AF_INET: 459 hlen = sizeof(struct ip); 460 if (inp) 461 break; 462 #ifdef INET6 463 if (in6p) { 464 /* mapped addr case */ 465 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) 466 && IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) 467 break; 468 } 469 #endif 470 return NULL; /*EINVAL*/ 471 #ifdef INET6 472 case AF_INET6: 473 hlen = sizeof(struct ip6_hdr); 474 if (in6p) { 475 /* more sainty check? */ 476 break; 477 } 478 return NULL; /*EINVAL*/ 479 #endif 480 default: 481 hlen = 0; /*pacify gcc*/ 482 return NULL; /*EAFNOSUPPORT*/ 483 } 484 #ifdef DIAGNOSTIC 485 if (hlen + sizeof(struct tcphdr) > MCLBYTES) 486 panic("mclbytes too small for t_template"); 487 #endif 488 m = tp->t_template; 489 if (m && m->m_len == hlen + sizeof(struct tcphdr)) 490 ; 491 else { 492 if (m) 493 m_freem(m); 494 m = tp->t_template = NULL; 495 MGETHDR(m, M_DONTWAIT, MT_HEADER); 496 if (m && hlen + sizeof(struct tcphdr) > MHLEN) { 497 MCLGET(m, M_DONTWAIT); 498 if ((m->m_flags & M_EXT) == 0) { 499 m_free(m); 500 m = NULL; 501 } 502 } 503 if (m == NULL) 504 return NULL; 505 MCLAIM(m, &tcp_mowner); 506 m->m_pkthdr.len = m->m_len = hlen + sizeof(struct tcphdr); 507 } 508 509 memset(mtod(m, void *), 0, m->m_len); 510 511 n = (struct tcphdr *)(mtod(m, char *) + hlen); 512 513 switch (tp->t_family) { 514 case AF_INET: 515 { 516 struct ipovly *ipov; 517 mtod(m, struct ip *)->ip_v = 4; 518 mtod(m, struct ip *)->ip_hl = hlen >> 2; 519 ipov = mtod(m, struct ipovly *); 520 ipov->ih_pr = IPPROTO_TCP; 521 ipov->ih_len = htons(sizeof(struct tcphdr)); 522 if (inp) { 523 ipov->ih_src = inp->inp_laddr; 524 ipov->ih_dst = inp->inp_faddr; 525 } 526 #ifdef INET6 527 else if (in6p) { 528 /* mapped addr case */ 529 bcopy(&in6p->in6p_laddr.s6_addr32[3], &ipov->ih_src, 530 sizeof(ipov->ih_src)); 531 bcopy(&in6p->in6p_faddr.s6_addr32[3], &ipov->ih_dst, 532 sizeof(ipov->ih_dst)); 533 } 534 #endif 535 /* 536 * Compute the pseudo-header portion of the checksum 537 * now. We incrementally add in the TCP option and 538 * payload lengths later, and then compute the TCP 539 * checksum right before the packet is sent off onto 540 * the wire. 541 */ 542 n->th_sum = in_cksum_phdr(ipov->ih_src.s_addr, 543 ipov->ih_dst.s_addr, 544 htons(sizeof(struct tcphdr) + IPPROTO_TCP)); 545 break; 546 } 547 #ifdef INET6 548 case AF_INET6: 549 { 550 struct ip6_hdr *ip6; 551 mtod(m, struct ip *)->ip_v = 6; 552 ip6 = mtod(m, struct ip6_hdr *); 553 ip6->ip6_nxt = IPPROTO_TCP; 554 ip6->ip6_plen = htons(sizeof(struct tcphdr)); 555 ip6->ip6_src = in6p->in6p_laddr; 556 ip6->ip6_dst = in6p->in6p_faddr; 557 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK; 558 if (ip6_auto_flowlabel) { 559 ip6->ip6_flow &= ~IPV6_FLOWLABEL_MASK; 560 ip6->ip6_flow |= 561 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 562 } 563 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 564 ip6->ip6_vfc |= IPV6_VERSION; 565 566 /* 567 * Compute the pseudo-header portion of the checksum 568 * now. We incrementally add in the TCP option and 569 * payload lengths later, and then compute the TCP 570 * checksum right before the packet is sent off onto 571 * the wire. 572 */ 573 n->th_sum = in6_cksum_phdr(&in6p->in6p_laddr, 574 &in6p->in6p_faddr, htonl(sizeof(struct tcphdr)), 575 htonl(IPPROTO_TCP)); 576 break; 577 } 578 #endif 579 } 580 if (inp) { 581 n->th_sport = inp->inp_lport; 582 n->th_dport = inp->inp_fport; 583 } 584 #ifdef INET6 585 else if (in6p) { 586 n->th_sport = in6p->in6p_lport; 587 n->th_dport = in6p->in6p_fport; 588 } 589 #endif 590 n->th_seq = 0; 591 n->th_ack = 0; 592 n->th_x2 = 0; 593 n->th_off = 5; 594 n->th_flags = 0; 595 n->th_win = 0; 596 n->th_urp = 0; 597 return (m); 598 } 599 600 /* 601 * Send a single message to the TCP at address specified by 602 * the given TCP/IP header. If m == 0, then we make a copy 603 * of the tcpiphdr at ti and send directly to the addressed host. 604 * This is used to force keep alive messages out using the TCP 605 * template for a connection tp->t_template. If flags are given 606 * then we send a message back to the TCP which originated the 607 * segment ti, and discard the mbuf containing it and any other 608 * attached mbufs. 609 * 610 * In any case the ack and sequence number of the transmitted 611 * segment are as specified by the parameters. 612 */ 613 int 614 tcp_respond(struct tcpcb *tp, struct mbuf *template, struct mbuf *m, 615 struct tcphdr *th0, tcp_seq ack, tcp_seq seq, int flags) 616 { 617 #ifdef INET6 618 struct rtentry *rt; 619 #endif 620 struct route *ro; 621 int error, tlen, win = 0; 622 int hlen; 623 struct ip *ip; 624 #ifdef INET6 625 struct ip6_hdr *ip6; 626 #endif 627 int family; /* family on packet, not inpcb/in6pcb! */ 628 struct tcphdr *th; 629 struct socket *so; 630 631 if (tp != NULL && (flags & TH_RST) == 0) { 632 #ifdef DIAGNOSTIC 633 if (tp->t_inpcb && tp->t_in6pcb) 634 panic("tcp_respond: both t_inpcb and t_in6pcb are set"); 635 #endif 636 #ifdef INET 637 if (tp->t_inpcb) 638 win = sbspace(&tp->t_inpcb->inp_socket->so_rcv); 639 #endif 640 #ifdef INET6 641 if (tp->t_in6pcb) 642 win = sbspace(&tp->t_in6pcb->in6p_socket->so_rcv); 643 #endif 644 } 645 646 th = NULL; /* Quell uninitialized warning */ 647 ip = NULL; 648 #ifdef INET6 649 ip6 = NULL; 650 #endif 651 if (m == 0) { 652 if (!template) 653 return EINVAL; 654 655 /* get family information from template */ 656 switch (mtod(template, struct ip *)->ip_v) { 657 case 4: 658 family = AF_INET; 659 hlen = sizeof(struct ip); 660 break; 661 #ifdef INET6 662 case 6: 663 family = AF_INET6; 664 hlen = sizeof(struct ip6_hdr); 665 break; 666 #endif 667 default: 668 return EAFNOSUPPORT; 669 } 670 671 MGETHDR(m, M_DONTWAIT, MT_HEADER); 672 if (m) { 673 MCLAIM(m, &tcp_tx_mowner); 674 MCLGET(m, M_DONTWAIT); 675 if ((m->m_flags & M_EXT) == 0) { 676 m_free(m); 677 m = NULL; 678 } 679 } 680 if (m == NULL) 681 return (ENOBUFS); 682 683 if (tcp_compat_42) 684 tlen = 1; 685 else 686 tlen = 0; 687 688 m->m_data += max_linkhdr; 689 bcopy(mtod(template, void *), mtod(m, void *), 690 template->m_len); 691 switch (family) { 692 case AF_INET: 693 ip = mtod(m, struct ip *); 694 th = (struct tcphdr *)(ip + 1); 695 break; 696 #ifdef INET6 697 case AF_INET6: 698 ip6 = mtod(m, struct ip6_hdr *); 699 th = (struct tcphdr *)(ip6 + 1); 700 break; 701 #endif 702 #if 0 703 default: 704 /* noone will visit here */ 705 m_freem(m); 706 return EAFNOSUPPORT; 707 #endif 708 } 709 flags = TH_ACK; 710 } else { 711 712 if ((m->m_flags & M_PKTHDR) == 0) { 713 #if 0 714 printf("non PKTHDR to tcp_respond\n"); 715 #endif 716 m_freem(m); 717 return EINVAL; 718 } 719 #ifdef DIAGNOSTIC 720 if (!th0) 721 panic("th0 == NULL in tcp_respond"); 722 #endif 723 724 /* get family information from m */ 725 switch (mtod(m, struct ip *)->ip_v) { 726 case 4: 727 family = AF_INET; 728 hlen = sizeof(struct ip); 729 ip = mtod(m, struct ip *); 730 break; 731 #ifdef INET6 732 case 6: 733 family = AF_INET6; 734 hlen = sizeof(struct ip6_hdr); 735 ip6 = mtod(m, struct ip6_hdr *); 736 break; 737 #endif 738 default: 739 m_freem(m); 740 return EAFNOSUPPORT; 741 } 742 /* clear h/w csum flags inherited from rx packet */ 743 m->m_pkthdr.csum_flags = 0; 744 745 if ((flags & TH_SYN) == 0 || sizeof(*th0) > (th0->th_off << 2)) 746 tlen = sizeof(*th0); 747 else 748 tlen = th0->th_off << 2; 749 750 if (m->m_len > hlen + tlen && (m->m_flags & M_EXT) == 0 && 751 mtod(m, char *) + hlen == (char *)th0) { 752 m->m_len = hlen + tlen; 753 m_freem(m->m_next); 754 m->m_next = NULL; 755 } else { 756 struct mbuf *n; 757 758 #ifdef DIAGNOSTIC 759 if (max_linkhdr + hlen + tlen > MCLBYTES) { 760 m_freem(m); 761 return EMSGSIZE; 762 } 763 #endif 764 MGETHDR(n, M_DONTWAIT, MT_HEADER); 765 if (n && max_linkhdr + hlen + tlen > MHLEN) { 766 MCLGET(n, M_DONTWAIT); 767 if ((n->m_flags & M_EXT) == 0) { 768 m_freem(n); 769 n = NULL; 770 } 771 } 772 if (!n) { 773 m_freem(m); 774 return ENOBUFS; 775 } 776 777 MCLAIM(n, &tcp_tx_mowner); 778 n->m_data += max_linkhdr; 779 n->m_len = hlen + tlen; 780 m_copyback(n, 0, hlen, mtod(m, void *)); 781 m_copyback(n, hlen, tlen, (void *)th0); 782 783 m_freem(m); 784 m = n; 785 n = NULL; 786 } 787 788 #define xchg(a,b,type) { type t; t=a; a=b; b=t; } 789 switch (family) { 790 case AF_INET: 791 ip = mtod(m, struct ip *); 792 th = (struct tcphdr *)(ip + 1); 793 ip->ip_p = IPPROTO_TCP; 794 xchg(ip->ip_dst, ip->ip_src, struct in_addr); 795 ip->ip_p = IPPROTO_TCP; 796 break; 797 #ifdef INET6 798 case AF_INET6: 799 ip6 = mtod(m, struct ip6_hdr *); 800 th = (struct tcphdr *)(ip6 + 1); 801 ip6->ip6_nxt = IPPROTO_TCP; 802 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr); 803 ip6->ip6_nxt = IPPROTO_TCP; 804 break; 805 #endif 806 #if 0 807 default: 808 /* noone will visit here */ 809 m_freem(m); 810 return EAFNOSUPPORT; 811 #endif 812 } 813 xchg(th->th_dport, th->th_sport, u_int16_t); 814 #undef xchg 815 tlen = 0; /*be friendly with the following code*/ 816 } 817 th->th_seq = htonl(seq); 818 th->th_ack = htonl(ack); 819 th->th_x2 = 0; 820 if ((flags & TH_SYN) == 0) { 821 if (tp) 822 win >>= tp->rcv_scale; 823 if (win > TCP_MAXWIN) 824 win = TCP_MAXWIN; 825 th->th_win = htons((u_int16_t)win); 826 th->th_off = sizeof (struct tcphdr) >> 2; 827 tlen += sizeof(*th); 828 } else 829 tlen += th->th_off << 2; 830 m->m_len = hlen + tlen; 831 m->m_pkthdr.len = hlen + tlen; 832 m->m_pkthdr.rcvif = (struct ifnet *) 0; 833 th->th_flags = flags; 834 th->th_urp = 0; 835 836 switch (family) { 837 #ifdef INET 838 case AF_INET: 839 { 840 struct ipovly *ipov = (struct ipovly *)ip; 841 memset(ipov->ih_x1, 0, sizeof ipov->ih_x1); 842 ipov->ih_len = htons((u_int16_t)tlen); 843 844 th->th_sum = 0; 845 th->th_sum = in_cksum(m, hlen + tlen); 846 ip->ip_len = htons(hlen + tlen); 847 ip->ip_ttl = ip_defttl; 848 break; 849 } 850 #endif 851 #ifdef INET6 852 case AF_INET6: 853 { 854 th->th_sum = 0; 855 th->th_sum = in6_cksum(m, IPPROTO_TCP, sizeof(struct ip6_hdr), 856 tlen); 857 ip6->ip6_plen = htons(tlen); 858 if (tp && tp->t_in6pcb) { 859 struct ifnet *oifp; 860 ro = &tp->t_in6pcb->in6p_route; 861 oifp = (rt = rtcache_validate(ro)) != NULL ? rt->rt_ifp 862 : NULL; 863 ip6->ip6_hlim = in6_selecthlim(tp->t_in6pcb, oifp); 864 } else 865 ip6->ip6_hlim = ip6_defhlim; 866 ip6->ip6_flow &= ~IPV6_FLOWINFO_MASK; 867 if (ip6_auto_flowlabel) { 868 ip6->ip6_flow |= 869 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 870 } 871 break; 872 } 873 #endif 874 } 875 876 if (tp && tp->t_inpcb) 877 so = tp->t_inpcb->inp_socket; 878 #ifdef INET6 879 else if (tp && tp->t_in6pcb) 880 so = tp->t_in6pcb->in6p_socket; 881 #endif 882 else 883 so = NULL; 884 885 if (tp != NULL && tp->t_inpcb != NULL) { 886 ro = &tp->t_inpcb->inp_route; 887 #ifdef DIAGNOSTIC 888 if (family != AF_INET) 889 panic("tcp_respond: address family mismatch"); 890 if (!in_hosteq(ip->ip_dst, tp->t_inpcb->inp_faddr)) { 891 panic("tcp_respond: ip_dst %x != inp_faddr %x", 892 ntohl(ip->ip_dst.s_addr), 893 ntohl(tp->t_inpcb->inp_faddr.s_addr)); 894 } 895 #endif 896 } 897 #ifdef INET6 898 else if (tp != NULL && tp->t_in6pcb != NULL) { 899 ro = (struct route *)&tp->t_in6pcb->in6p_route; 900 #ifdef DIAGNOSTIC 901 if (family == AF_INET) { 902 if (!IN6_IS_ADDR_V4MAPPED(&tp->t_in6pcb->in6p_faddr)) 903 panic("tcp_respond: not mapped addr"); 904 if (memcmp(&ip->ip_dst, 905 &tp->t_in6pcb->in6p_faddr.s6_addr32[3], 906 sizeof(ip->ip_dst)) != 0) { 907 panic("tcp_respond: ip_dst != in6p_faddr"); 908 } 909 } else if (family == AF_INET6) { 910 if (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 911 &tp->t_in6pcb->in6p_faddr)) 912 panic("tcp_respond: ip6_dst != in6p_faddr"); 913 } else 914 panic("tcp_respond: address family mismatch"); 915 #endif 916 } 917 #endif 918 else 919 ro = NULL; 920 921 switch (family) { 922 #ifdef INET 923 case AF_INET: 924 error = ip_output(m, NULL, ro, 925 (tp && tp->t_mtudisc ? IP_MTUDISC : 0), 926 (struct ip_moptions *)0, so); 927 break; 928 #endif 929 #ifdef INET6 930 case AF_INET6: 931 error = ip6_output(m, NULL, ro, 0, NULL, so, NULL); 932 break; 933 #endif 934 default: 935 error = EAFNOSUPPORT; 936 break; 937 } 938 939 return (error); 940 } 941 942 /* 943 * Template TCPCB. Rather than zeroing a new TCPCB and initializing 944 * a bunch of members individually, we maintain this template for the 945 * static and mostly-static components of the TCPCB, and copy it into 946 * the new TCPCB instead. 947 */ 948 static struct tcpcb tcpcb_template = { 949 .t_srtt = TCPTV_SRTTBASE, 950 .t_rttmin = TCPTV_MIN, 951 952 .snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT, 953 .snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT, 954 .snd_numholes = 0, 955 956 .t_partialacks = -1, 957 .t_bytes_acked = 0, 958 }; 959 960 /* 961 * Updates the TCPCB template whenever a parameter that would affect 962 * the template is changed. 963 */ 964 void 965 tcp_tcpcb_template(void) 966 { 967 struct tcpcb *tp = &tcpcb_template; 968 int flags; 969 970 tp->t_peermss = tcp_mssdflt; 971 tp->t_ourmss = tcp_mssdflt; 972 tp->t_segsz = tcp_mssdflt; 973 974 flags = 0; 975 if (tcp_do_rfc1323 && tcp_do_win_scale) 976 flags |= TF_REQ_SCALE; 977 if (tcp_do_rfc1323 && tcp_do_timestamps) 978 flags |= TF_REQ_TSTMP; 979 tp->t_flags = flags; 980 981 /* 982 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no 983 * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives 984 * reasonable initial retransmit time. 985 */ 986 tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << (TCP_RTTVAR_SHIFT + 2 - 1); 987 TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp), 988 TCPTV_MIN, TCPTV_REXMTMAX); 989 990 /* Keep Alive */ 991 tp->t_keepinit = tcp_keepinit; 992 tp->t_keepidle = tcp_keepidle; 993 tp->t_keepintvl = tcp_keepintvl; 994 tp->t_keepcnt = tcp_keepcnt; 995 tp->t_maxidle = tp->t_keepcnt * tp->t_keepintvl; 996 997 /* MSL */ 998 tp->t_msl = TCPTV_MSL; 999 } 1000 1001 /* 1002 * Create a new TCP control block, making an 1003 * empty reassembly queue and hooking it to the argument 1004 * protocol control block. 1005 */ 1006 /* family selects inpcb, or in6pcb */ 1007 struct tcpcb * 1008 tcp_newtcpcb(int family, void *aux) 1009 { 1010 #ifdef INET6 1011 struct rtentry *rt; 1012 #endif 1013 struct tcpcb *tp; 1014 int i; 1015 1016 /* XXX Consider using a pool_cache for speed. */ 1017 tp = pool_get(&tcpcb_pool, PR_NOWAIT); /* splsoftnet via tcp_usrreq */ 1018 if (tp == NULL) 1019 return (NULL); 1020 memcpy(tp, &tcpcb_template, sizeof(*tp)); 1021 TAILQ_INIT(&tp->segq); 1022 TAILQ_INIT(&tp->timeq); 1023 tp->t_family = family; /* may be overridden later on */ 1024 TAILQ_INIT(&tp->snd_holes); 1025 LIST_INIT(&tp->t_sc); /* XXX can template this */ 1026 1027 /* Don't sweat this loop; hopefully the compiler will unroll it. */ 1028 for (i = 0; i < TCPT_NTIMERS; i++) { 1029 callout_init(&tp->t_timer[i], CALLOUT_MPSAFE); 1030 TCP_TIMER_INIT(tp, i); 1031 } 1032 callout_init(&tp->t_delack_ch, CALLOUT_MPSAFE); 1033 1034 switch (family) { 1035 case AF_INET: 1036 { 1037 struct inpcb *inp = (struct inpcb *)aux; 1038 1039 inp->inp_ip.ip_ttl = ip_defttl; 1040 inp->inp_ppcb = (void *)tp; 1041 1042 tp->t_inpcb = inp; 1043 tp->t_mtudisc = ip_mtudisc; 1044 break; 1045 } 1046 #ifdef INET6 1047 case AF_INET6: 1048 { 1049 struct in6pcb *in6p = (struct in6pcb *)aux; 1050 1051 in6p->in6p_ip6.ip6_hlim = in6_selecthlim(in6p, 1052 (rt = rtcache_validate(&in6p->in6p_route)) != NULL 1053 ? rt->rt_ifp 1054 : NULL); 1055 in6p->in6p_ppcb = (void *)tp; 1056 1057 tp->t_in6pcb = in6p; 1058 /* for IPv6, always try to run path MTU discovery */ 1059 tp->t_mtudisc = 1; 1060 break; 1061 } 1062 #endif /* INET6 */ 1063 default: 1064 for (i = 0; i < TCPT_NTIMERS; i++) 1065 callout_destroy(&tp->t_timer[i]); 1066 callout_destroy(&tp->t_delack_ch); 1067 pool_put(&tcpcb_pool, tp); /* splsoftnet via tcp_usrreq */ 1068 return (NULL); 1069 } 1070 1071 /* 1072 * Initialize our timebase. When we send timestamps, we take 1073 * the delta from tcp_now -- this means each connection always 1074 * gets a timebase of 1, which makes it, among other things, 1075 * more difficult to determine how long a system has been up, 1076 * and thus how many TCP sequence increments have occurred. 1077 * 1078 * We start with 1, because 0 doesn't work with linux, which 1079 * considers timestamp 0 in a SYN packet as a bug and disables 1080 * timestamps. 1081 */ 1082 tp->ts_timebase = tcp_now - 1; 1083 1084 tcp_congctl_select(tp, tcp_congctl_global_name); 1085 1086 return (tp); 1087 } 1088 1089 /* 1090 * Drop a TCP connection, reporting 1091 * the specified error. If connection is synchronized, 1092 * then send a RST to peer. 1093 */ 1094 struct tcpcb * 1095 tcp_drop(struct tcpcb *tp, int errno) 1096 { 1097 struct socket *so = NULL; 1098 1099 #ifdef DIAGNOSTIC 1100 if (tp->t_inpcb && tp->t_in6pcb) 1101 panic("tcp_drop: both t_inpcb and t_in6pcb are set"); 1102 #endif 1103 #ifdef INET 1104 if (tp->t_inpcb) 1105 so = tp->t_inpcb->inp_socket; 1106 #endif 1107 #ifdef INET6 1108 if (tp->t_in6pcb) 1109 so = tp->t_in6pcb->in6p_socket; 1110 #endif 1111 if (!so) 1112 return NULL; 1113 1114 if (TCPS_HAVERCVDSYN(tp->t_state)) { 1115 tp->t_state = TCPS_CLOSED; 1116 (void) tcp_output(tp); 1117 TCP_STATINC(TCP_STAT_DROPS); 1118 } else 1119 TCP_STATINC(TCP_STAT_CONNDROPS); 1120 if (errno == ETIMEDOUT && tp->t_softerror) 1121 errno = tp->t_softerror; 1122 so->so_error = errno; 1123 return (tcp_close(tp)); 1124 } 1125 1126 /* 1127 * Close a TCP control block: 1128 * discard all space held by the tcp 1129 * discard internet protocol block 1130 * wake up any sleepers 1131 */ 1132 struct tcpcb * 1133 tcp_close(struct tcpcb *tp) 1134 { 1135 struct inpcb *inp; 1136 #ifdef INET6 1137 struct in6pcb *in6p; 1138 #endif 1139 struct socket *so; 1140 #ifdef RTV_RTT 1141 struct rtentry *rt; 1142 #endif 1143 struct route *ro; 1144 int j; 1145 1146 inp = tp->t_inpcb; 1147 #ifdef INET6 1148 in6p = tp->t_in6pcb; 1149 #endif 1150 so = NULL; 1151 ro = NULL; 1152 if (inp) { 1153 so = inp->inp_socket; 1154 ro = &inp->inp_route; 1155 } 1156 #ifdef INET6 1157 else if (in6p) { 1158 so = in6p->in6p_socket; 1159 ro = (struct route *)&in6p->in6p_route; 1160 } 1161 #endif 1162 1163 #ifdef RTV_RTT 1164 /* 1165 * If we sent enough data to get some meaningful characteristics, 1166 * save them in the routing entry. 'Enough' is arbitrarily 1167 * defined as the sendpipesize (default 4K) * 16. This would 1168 * give us 16 rtt samples assuming we only get one sample per 1169 * window (the usual case on a long haul net). 16 samples is 1170 * enough for the srtt filter to converge to within 5% of the correct 1171 * value; fewer samples and we could save a very bogus rtt. 1172 * 1173 * Don't update the default route's characteristics and don't 1174 * update anything that the user "locked". 1175 */ 1176 if (SEQ_LT(tp->iss + so->so_snd.sb_hiwat * 16, tp->snd_max) && 1177 ro && (rt = rtcache_validate(ro)) != NULL && 1178 !in_nullhost(satocsin(rt_getkey(rt))->sin_addr)) { 1179 u_long i = 0; 1180 1181 if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) { 1182 i = tp->t_srtt * 1183 ((RTM_RTTUNIT / PR_SLOWHZ) >> (TCP_RTT_SHIFT + 2)); 1184 if (rt->rt_rmx.rmx_rtt && i) 1185 /* 1186 * filter this update to half the old & half 1187 * the new values, converting scale. 1188 * See route.h and tcp_var.h for a 1189 * description of the scaling constants. 1190 */ 1191 rt->rt_rmx.rmx_rtt = 1192 (rt->rt_rmx.rmx_rtt + i) / 2; 1193 else 1194 rt->rt_rmx.rmx_rtt = i; 1195 } 1196 if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) { 1197 i = tp->t_rttvar * 1198 ((RTM_RTTUNIT / PR_SLOWHZ) >> (TCP_RTTVAR_SHIFT + 2)); 1199 if (rt->rt_rmx.rmx_rttvar && i) 1200 rt->rt_rmx.rmx_rttvar = 1201 (rt->rt_rmx.rmx_rttvar + i) / 2; 1202 else 1203 rt->rt_rmx.rmx_rttvar = i; 1204 } 1205 /* 1206 * update the pipelimit (ssthresh) if it has been updated 1207 * already or if a pipesize was specified & the threshhold 1208 * got below half the pipesize. I.e., wait for bad news 1209 * before we start updating, then update on both good 1210 * and bad news. 1211 */ 1212 if (((rt->rt_rmx.rmx_locks & RTV_SSTHRESH) == 0 && 1213 (i = tp->snd_ssthresh) && rt->rt_rmx.rmx_ssthresh) || 1214 i < (rt->rt_rmx.rmx_sendpipe / 2)) { 1215 /* 1216 * convert the limit from user data bytes to 1217 * packets then to packet data bytes. 1218 */ 1219 i = (i + tp->t_segsz / 2) / tp->t_segsz; 1220 if (i < 2) 1221 i = 2; 1222 i *= (u_long)(tp->t_segsz + sizeof (struct tcpiphdr)); 1223 if (rt->rt_rmx.rmx_ssthresh) 1224 rt->rt_rmx.rmx_ssthresh = 1225 (rt->rt_rmx.rmx_ssthresh + i) / 2; 1226 else 1227 rt->rt_rmx.rmx_ssthresh = i; 1228 } 1229 } 1230 #endif /* RTV_RTT */ 1231 /* free the reassembly queue, if any */ 1232 TCP_REASS_LOCK(tp); 1233 (void) tcp_freeq(tp); 1234 TCP_REASS_UNLOCK(tp); 1235 1236 /* free the SACK holes list. */ 1237 tcp_free_sackholes(tp); 1238 tcp_congctl_release(tp); 1239 syn_cache_cleanup(tp); 1240 1241 if (tp->t_template) { 1242 m_free(tp->t_template); 1243 tp->t_template = NULL; 1244 } 1245 1246 /* 1247 * Detaching the pcb will unlock the socket/tcpcb, and stopping 1248 * the timers can also drop the lock. We need to prevent access 1249 * to the tcpcb as it's half torn down. Flag the pcb as dead 1250 * (prevents access by timers) and only then detach it. 1251 */ 1252 tp->t_flags |= TF_DEAD; 1253 if (inp) { 1254 inp->inp_ppcb = 0; 1255 soisdisconnected(so); 1256 in_pcbdetach(inp); 1257 } 1258 #ifdef INET6 1259 else if (in6p) { 1260 in6p->in6p_ppcb = 0; 1261 soisdisconnected(so); 1262 in6_pcbdetach(in6p); 1263 } 1264 #endif 1265 /* 1266 * pcb is no longer visble elsewhere, so we can safely release 1267 * the lock in callout_halt() if needed. 1268 */ 1269 TCP_STATINC(TCP_STAT_CLOSED); 1270 for (j = 0; j < TCPT_NTIMERS; j++) { 1271 callout_halt(&tp->t_timer[j], softnet_lock); 1272 callout_destroy(&tp->t_timer[j]); 1273 } 1274 callout_halt(&tp->t_delack_ch, softnet_lock); 1275 callout_destroy(&tp->t_delack_ch); 1276 pool_put(&tcpcb_pool, tp); 1277 1278 return ((struct tcpcb *)0); 1279 } 1280 1281 int 1282 tcp_freeq(struct tcpcb *tp) 1283 { 1284 struct ipqent *qe; 1285 int rv = 0; 1286 #ifdef TCPREASS_DEBUG 1287 int i = 0; 1288 #endif 1289 1290 TCP_REASS_LOCK_CHECK(tp); 1291 1292 while ((qe = TAILQ_FIRST(&tp->segq)) != NULL) { 1293 #ifdef TCPREASS_DEBUG 1294 printf("tcp_freeq[%p,%d]: %u:%u(%u) 0x%02x\n", 1295 tp, i++, qe->ipqe_seq, qe->ipqe_seq + qe->ipqe_len, 1296 qe->ipqe_len, qe->ipqe_flags & (TH_SYN|TH_FIN|TH_RST)); 1297 #endif 1298 TAILQ_REMOVE(&tp->segq, qe, ipqe_q); 1299 TAILQ_REMOVE(&tp->timeq, qe, ipqe_timeq); 1300 m_freem(qe->ipqe_m); 1301 tcpipqent_free(qe); 1302 rv = 1; 1303 } 1304 tp->t_segqlen = 0; 1305 KASSERT(TAILQ_EMPTY(&tp->timeq)); 1306 return (rv); 1307 } 1308 1309 void 1310 tcp_fasttimo(void) 1311 { 1312 if (tcp_drainwanted) { 1313 tcp_drain(); 1314 tcp_drainwanted = 0; 1315 } 1316 } 1317 1318 void 1319 tcp_drainstub(void) 1320 { 1321 tcp_drainwanted = 1; 1322 } 1323 1324 /* 1325 * Protocol drain routine. Called when memory is in short supply. 1326 * Called from pr_fasttimo thus a callout context. 1327 */ 1328 void 1329 tcp_drain(void) 1330 { 1331 struct inpcb_hdr *inph; 1332 struct tcpcb *tp; 1333 1334 mutex_enter(softnet_lock); 1335 KERNEL_LOCK(1, NULL); 1336 1337 /* 1338 * Free the sequence queue of all TCP connections. 1339 */ 1340 CIRCLEQ_FOREACH(inph, &tcbtable.inpt_queue, inph_queue) { 1341 switch (inph->inph_af) { 1342 case AF_INET: 1343 tp = intotcpcb((struct inpcb *)inph); 1344 break; 1345 #ifdef INET6 1346 case AF_INET6: 1347 tp = in6totcpcb((struct in6pcb *)inph); 1348 break; 1349 #endif 1350 default: 1351 tp = NULL; 1352 break; 1353 } 1354 if (tp != NULL) { 1355 /* 1356 * We may be called from a device's interrupt 1357 * context. If the tcpcb is already busy, 1358 * just bail out now. 1359 */ 1360 if (tcp_reass_lock_try(tp) == 0) 1361 continue; 1362 if (tcp_freeq(tp)) 1363 TCP_STATINC(TCP_STAT_CONNSDRAINED); 1364 TCP_REASS_UNLOCK(tp); 1365 } 1366 } 1367 1368 KERNEL_UNLOCK_ONE(NULL); 1369 mutex_exit(softnet_lock); 1370 } 1371 1372 /* 1373 * Notify a tcp user of an asynchronous error; 1374 * store error as soft error, but wake up user 1375 * (for now, won't do anything until can select for soft error). 1376 */ 1377 void 1378 tcp_notify(struct inpcb *inp, int error) 1379 { 1380 struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb; 1381 struct socket *so = inp->inp_socket; 1382 1383 /* 1384 * Ignore some errors if we are hooked up. 1385 * If connection hasn't completed, has retransmitted several times, 1386 * and receives a second error, give up now. This is better 1387 * than waiting a long time to establish a connection that 1388 * can never complete. 1389 */ 1390 if (tp->t_state == TCPS_ESTABLISHED && 1391 (error == EHOSTUNREACH || error == ENETUNREACH || 1392 error == EHOSTDOWN)) { 1393 return; 1394 } else if (TCPS_HAVEESTABLISHED(tp->t_state) == 0 && 1395 tp->t_rxtshift > 3 && tp->t_softerror) 1396 so->so_error = error; 1397 else 1398 tp->t_softerror = error; 1399 cv_broadcast(&so->so_cv); 1400 sorwakeup(so); 1401 sowwakeup(so); 1402 } 1403 1404 #ifdef INET6 1405 void 1406 tcp6_notify(struct in6pcb *in6p, int error) 1407 { 1408 struct tcpcb *tp = (struct tcpcb *)in6p->in6p_ppcb; 1409 struct socket *so = in6p->in6p_socket; 1410 1411 /* 1412 * Ignore some errors if we are hooked up. 1413 * If connection hasn't completed, has retransmitted several times, 1414 * and receives a second error, give up now. This is better 1415 * than waiting a long time to establish a connection that 1416 * can never complete. 1417 */ 1418 if (tp->t_state == TCPS_ESTABLISHED && 1419 (error == EHOSTUNREACH || error == ENETUNREACH || 1420 error == EHOSTDOWN)) { 1421 return; 1422 } else if (TCPS_HAVEESTABLISHED(tp->t_state) == 0 && 1423 tp->t_rxtshift > 3 && tp->t_softerror) 1424 so->so_error = error; 1425 else 1426 tp->t_softerror = error; 1427 cv_broadcast(&so->so_cv); 1428 sorwakeup(so); 1429 sowwakeup(so); 1430 } 1431 #endif 1432 1433 #ifdef INET6 1434 void * 1435 tcp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) 1436 { 1437 struct tcphdr th; 1438 void (*notify)(struct in6pcb *, int) = tcp6_notify; 1439 int nmatch; 1440 struct ip6_hdr *ip6; 1441 const struct sockaddr_in6 *sa6_src = NULL; 1442 const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; 1443 struct mbuf *m; 1444 int off; 1445 1446 if (sa->sa_family != AF_INET6 || 1447 sa->sa_len != sizeof(struct sockaddr_in6)) 1448 return NULL; 1449 if ((unsigned)cmd >= PRC_NCMDS) 1450 return NULL; 1451 else if (cmd == PRC_QUENCH) { 1452 /* 1453 * Don't honor ICMP Source Quench messages meant for 1454 * TCP connections. 1455 */ 1456 return NULL; 1457 } else if (PRC_IS_REDIRECT(cmd)) 1458 notify = in6_rtchange, d = NULL; 1459 else if (cmd == PRC_MSGSIZE) 1460 ; /* special code is present, see below */ 1461 else if (cmd == PRC_HOSTDEAD) 1462 d = NULL; 1463 else if (inet6ctlerrmap[cmd] == 0) 1464 return NULL; 1465 1466 /* if the parameter is from icmp6, decode it. */ 1467 if (d != NULL) { 1468 struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d; 1469 m = ip6cp->ip6c_m; 1470 ip6 = ip6cp->ip6c_ip6; 1471 off = ip6cp->ip6c_off; 1472 sa6_src = ip6cp->ip6c_src; 1473 } else { 1474 m = NULL; 1475 ip6 = NULL; 1476 sa6_src = &sa6_any; 1477 off = 0; 1478 } 1479 1480 if (ip6) { 1481 /* 1482 * XXX: We assume that when ip6 is non NULL, 1483 * M and OFF are valid. 1484 */ 1485 1486 /* check if we can safely examine src and dst ports */ 1487 if (m->m_pkthdr.len < off + sizeof(th)) { 1488 if (cmd == PRC_MSGSIZE) 1489 icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); 1490 return NULL; 1491 } 1492 1493 memset(&th, 0, sizeof(th)); 1494 m_copydata(m, off, sizeof(th), (void *)&th); 1495 1496 if (cmd == PRC_MSGSIZE) { 1497 int valid = 0; 1498 1499 /* 1500 * Check to see if we have a valid TCP connection 1501 * corresponding to the address in the ICMPv6 message 1502 * payload. 1503 */ 1504 if (in6_pcblookup_connect(&tcbtable, &sa6->sin6_addr, 1505 th.th_dport, 1506 (const struct in6_addr *)&sa6_src->sin6_addr, 1507 th.th_sport, 0, 0)) 1508 valid++; 1509 1510 /* 1511 * Depending on the value of "valid" and routing table 1512 * size (mtudisc_{hi,lo}wat), we will: 1513 * - recalcurate the new MTU and create the 1514 * corresponding routing entry, or 1515 * - ignore the MTU change notification. 1516 */ 1517 icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); 1518 1519 /* 1520 * no need to call in6_pcbnotify, it should have been 1521 * called via callback if necessary 1522 */ 1523 return NULL; 1524 } 1525 1526 nmatch = in6_pcbnotify(&tcbtable, sa, th.th_dport, 1527 (const struct sockaddr *)sa6_src, th.th_sport, cmd, NULL, notify); 1528 if (nmatch == 0 && syn_cache_count && 1529 (inet6ctlerrmap[cmd] == EHOSTUNREACH || 1530 inet6ctlerrmap[cmd] == ENETUNREACH || 1531 inet6ctlerrmap[cmd] == EHOSTDOWN)) 1532 syn_cache_unreach((const struct sockaddr *)sa6_src, 1533 sa, &th); 1534 } else { 1535 (void) in6_pcbnotify(&tcbtable, sa, 0, 1536 (const struct sockaddr *)sa6_src, 0, cmd, NULL, notify); 1537 } 1538 1539 return NULL; 1540 } 1541 #endif 1542 1543 #ifdef INET 1544 /* assumes that ip header and tcp header are contiguous on mbuf */ 1545 void * 1546 tcp_ctlinput(int cmd, const struct sockaddr *sa, void *v) 1547 { 1548 struct ip *ip = v; 1549 struct tcphdr *th; 1550 struct icmp *icp; 1551 extern const int inetctlerrmap[]; 1552 void (*notify)(struct inpcb *, int) = tcp_notify; 1553 int errno; 1554 int nmatch; 1555 struct tcpcb *tp; 1556 u_int mtu; 1557 tcp_seq seq; 1558 struct inpcb *inp; 1559 #ifdef INET6 1560 struct in6pcb *in6p; 1561 struct in6_addr src6, dst6; 1562 #endif 1563 1564 if (sa->sa_family != AF_INET || 1565 sa->sa_len != sizeof(struct sockaddr_in)) 1566 return NULL; 1567 if ((unsigned)cmd >= PRC_NCMDS) 1568 return NULL; 1569 errno = inetctlerrmap[cmd]; 1570 if (cmd == PRC_QUENCH) 1571 /* 1572 * Don't honor ICMP Source Quench messages meant for 1573 * TCP connections. 1574 */ 1575 return NULL; 1576 else if (PRC_IS_REDIRECT(cmd)) 1577 notify = in_rtchange, ip = 0; 1578 else if (cmd == PRC_MSGSIZE && ip && ip->ip_v == 4) { 1579 /* 1580 * Check to see if we have a valid TCP connection 1581 * corresponding to the address in the ICMP message 1582 * payload. 1583 * 1584 * Boundary check is made in icmp_input(), with ICMP_ADVLENMIN. 1585 */ 1586 th = (struct tcphdr *)((char *)ip + (ip->ip_hl << 2)); 1587 #ifdef INET6 1588 memset(&src6, 0, sizeof(src6)); 1589 memset(&dst6, 0, sizeof(dst6)); 1590 src6.s6_addr16[5] = dst6.s6_addr16[5] = 0xffff; 1591 memcpy(&src6.s6_addr32[3], &ip->ip_src, sizeof(struct in_addr)); 1592 memcpy(&dst6.s6_addr32[3], &ip->ip_dst, sizeof(struct in_addr)); 1593 #endif 1594 if ((inp = in_pcblookup_connect(&tcbtable, ip->ip_dst, 1595 th->th_dport, ip->ip_src, th->th_sport, 0)) != NULL) 1596 #ifdef INET6 1597 in6p = NULL; 1598 #else 1599 ; 1600 #endif 1601 #ifdef INET6 1602 else if ((in6p = in6_pcblookup_connect(&tcbtable, &dst6, 1603 th->th_dport, &src6, th->th_sport, 0, 0)) != NULL) 1604 ; 1605 #endif 1606 else 1607 return NULL; 1608 1609 /* 1610 * Now that we've validated that we are actually communicating 1611 * with the host indicated in the ICMP message, locate the 1612 * ICMP header, recalculate the new MTU, and create the 1613 * corresponding routing entry. 1614 */ 1615 icp = (struct icmp *)((char *)ip - 1616 offsetof(struct icmp, icmp_ip)); 1617 if (inp) { 1618 if ((tp = intotcpcb(inp)) == NULL) 1619 return NULL; 1620 } 1621 #ifdef INET6 1622 else if (in6p) { 1623 if ((tp = in6totcpcb(in6p)) == NULL) 1624 return NULL; 1625 } 1626 #endif 1627 else 1628 return NULL; 1629 seq = ntohl(th->th_seq); 1630 if (SEQ_LT(seq, tp->snd_una) || SEQ_GT(seq, tp->snd_max)) 1631 return NULL; 1632 /* 1633 * If the ICMP message advertises a Next-Hop MTU 1634 * equal or larger than the maximum packet size we have 1635 * ever sent, drop the message. 1636 */ 1637 mtu = (u_int)ntohs(icp->icmp_nextmtu); 1638 if (mtu >= tp->t_pmtud_mtu_sent) 1639 return NULL; 1640 if (mtu >= tcp_hdrsz(tp) + tp->t_pmtud_mss_acked) { 1641 /* 1642 * Calculate new MTU, and create corresponding 1643 * route (traditional PMTUD). 1644 */ 1645 tp->t_flags &= ~TF_PMTUD_PEND; 1646 icmp_mtudisc(icp, ip->ip_dst); 1647 } else { 1648 /* 1649 * Record the information got in the ICMP 1650 * message; act on it later. 1651 * If we had already recorded an ICMP message, 1652 * replace the old one only if the new message 1653 * refers to an older TCP segment 1654 */ 1655 if (tp->t_flags & TF_PMTUD_PEND) { 1656 if (SEQ_LT(tp->t_pmtud_th_seq, seq)) 1657 return NULL; 1658 } else 1659 tp->t_flags |= TF_PMTUD_PEND; 1660 tp->t_pmtud_th_seq = seq; 1661 tp->t_pmtud_nextmtu = icp->icmp_nextmtu; 1662 tp->t_pmtud_ip_len = icp->icmp_ip.ip_len; 1663 tp->t_pmtud_ip_hl = icp->icmp_ip.ip_hl; 1664 } 1665 return NULL; 1666 } else if (cmd == PRC_HOSTDEAD) 1667 ip = 0; 1668 else if (errno == 0) 1669 return NULL; 1670 if (ip && ip->ip_v == 4 && sa->sa_family == AF_INET) { 1671 th = (struct tcphdr *)((char *)ip + (ip->ip_hl << 2)); 1672 nmatch = in_pcbnotify(&tcbtable, satocsin(sa)->sin_addr, 1673 th->th_dport, ip->ip_src, th->th_sport, errno, notify); 1674 if (nmatch == 0 && syn_cache_count && 1675 (inetctlerrmap[cmd] == EHOSTUNREACH || 1676 inetctlerrmap[cmd] == ENETUNREACH || 1677 inetctlerrmap[cmd] == EHOSTDOWN)) { 1678 struct sockaddr_in sin; 1679 memset(&sin, 0, sizeof(sin)); 1680 sin.sin_len = sizeof(sin); 1681 sin.sin_family = AF_INET; 1682 sin.sin_port = th->th_sport; 1683 sin.sin_addr = ip->ip_src; 1684 syn_cache_unreach((struct sockaddr *)&sin, sa, th); 1685 } 1686 1687 /* XXX mapped address case */ 1688 } else 1689 in_pcbnotifyall(&tcbtable, satocsin(sa)->sin_addr, errno, 1690 notify); 1691 return NULL; 1692 } 1693 1694 /* 1695 * When a source quench is received, we are being notified of congestion. 1696 * Close the congestion window down to the Loss Window (one segment). 1697 * We will gradually open it again as we proceed. 1698 */ 1699 void 1700 tcp_quench(struct inpcb *inp, int errno) 1701 { 1702 struct tcpcb *tp = intotcpcb(inp); 1703 1704 if (tp) { 1705 tp->snd_cwnd = tp->t_segsz; 1706 tp->t_bytes_acked = 0; 1707 } 1708 } 1709 #endif 1710 1711 #ifdef INET6 1712 void 1713 tcp6_quench(struct in6pcb *in6p, int errno) 1714 { 1715 struct tcpcb *tp = in6totcpcb(in6p); 1716 1717 if (tp) { 1718 tp->snd_cwnd = tp->t_segsz; 1719 tp->t_bytes_acked = 0; 1720 } 1721 } 1722 #endif 1723 1724 #ifdef INET 1725 /* 1726 * Path MTU Discovery handlers. 1727 */ 1728 void 1729 tcp_mtudisc_callback(struct in_addr faddr) 1730 { 1731 #ifdef INET6 1732 struct in6_addr in6; 1733 #endif 1734 1735 in_pcbnotifyall(&tcbtable, faddr, EMSGSIZE, tcp_mtudisc); 1736 #ifdef INET6 1737 memset(&in6, 0, sizeof(in6)); 1738 in6.s6_addr16[5] = 0xffff; 1739 memcpy(&in6.s6_addr32[3], &faddr, sizeof(struct in_addr)); 1740 tcp6_mtudisc_callback(&in6); 1741 #endif 1742 } 1743 1744 /* 1745 * On receipt of path MTU corrections, flush old route and replace it 1746 * with the new one. Retransmit all unacknowledged packets, to ensure 1747 * that all packets will be received. 1748 */ 1749 void 1750 tcp_mtudisc(struct inpcb *inp, int errno) 1751 { 1752 struct tcpcb *tp = intotcpcb(inp); 1753 struct rtentry *rt = in_pcbrtentry(inp); 1754 1755 if (tp != 0) { 1756 if (rt != 0) { 1757 /* 1758 * If this was not a host route, remove and realloc. 1759 */ 1760 if ((rt->rt_flags & RTF_HOST) == 0) { 1761 in_rtchange(inp, errno); 1762 if ((rt = in_pcbrtentry(inp)) == 0) 1763 return; 1764 } 1765 1766 /* 1767 * Slow start out of the error condition. We 1768 * use the MTU because we know it's smaller 1769 * than the previously transmitted segment. 1770 * 1771 * Note: This is more conservative than the 1772 * suggestion in draft-floyd-incr-init-win-03. 1773 */ 1774 if (rt->rt_rmx.rmx_mtu != 0) 1775 tp->snd_cwnd = 1776 TCP_INITIAL_WINDOW(tcp_init_win, 1777 rt->rt_rmx.rmx_mtu); 1778 } 1779 1780 /* 1781 * Resend unacknowledged packets. 1782 */ 1783 tp->snd_nxt = tp->sack_newdata = tp->snd_una; 1784 tcp_output(tp); 1785 } 1786 } 1787 #endif 1788 1789 #ifdef INET6 1790 /* 1791 * Path MTU Discovery handlers. 1792 */ 1793 void 1794 tcp6_mtudisc_callback(struct in6_addr *faddr) 1795 { 1796 struct sockaddr_in6 sin6; 1797 1798 memset(&sin6, 0, sizeof(sin6)); 1799 sin6.sin6_family = AF_INET6; 1800 sin6.sin6_len = sizeof(struct sockaddr_in6); 1801 sin6.sin6_addr = *faddr; 1802 (void) in6_pcbnotify(&tcbtable, (struct sockaddr *)&sin6, 0, 1803 (const struct sockaddr *)&sa6_any, 0, PRC_MSGSIZE, NULL, tcp6_mtudisc); 1804 } 1805 1806 void 1807 tcp6_mtudisc(struct in6pcb *in6p, int errno) 1808 { 1809 struct tcpcb *tp = in6totcpcb(in6p); 1810 struct rtentry *rt = in6_pcbrtentry(in6p); 1811 1812 if (tp != 0) { 1813 if (rt != 0) { 1814 /* 1815 * If this was not a host route, remove and realloc. 1816 */ 1817 if ((rt->rt_flags & RTF_HOST) == 0) { 1818 in6_rtchange(in6p, errno); 1819 if ((rt = in6_pcbrtentry(in6p)) == 0) 1820 return; 1821 } 1822 1823 /* 1824 * Slow start out of the error condition. We 1825 * use the MTU because we know it's smaller 1826 * than the previously transmitted segment. 1827 * 1828 * Note: This is more conservative than the 1829 * suggestion in draft-floyd-incr-init-win-03. 1830 */ 1831 if (rt->rt_rmx.rmx_mtu != 0) 1832 tp->snd_cwnd = 1833 TCP_INITIAL_WINDOW(tcp_init_win, 1834 rt->rt_rmx.rmx_mtu); 1835 } 1836 1837 /* 1838 * Resend unacknowledged packets. 1839 */ 1840 tp->snd_nxt = tp->sack_newdata = tp->snd_una; 1841 tcp_output(tp); 1842 } 1843 } 1844 #endif /* INET6 */ 1845 1846 /* 1847 * Compute the MSS to advertise to the peer. Called only during 1848 * the 3-way handshake. If we are the server (peer initiated 1849 * connection), we are called with a pointer to the interface 1850 * on which the SYN packet arrived. If we are the client (we 1851 * initiated connection), we are called with a pointer to the 1852 * interface out which this connection should go. 1853 * 1854 * NOTE: Do not subtract IP option/extension header size nor IPsec 1855 * header size from MSS advertisement. MSS option must hold the maximum 1856 * segment size we can accept, so it must always be: 1857 * max(if mtu) - ip header - tcp header 1858 */ 1859 u_long 1860 tcp_mss_to_advertise(const struct ifnet *ifp, int af) 1861 { 1862 extern u_long in_maxmtu; 1863 u_long mss = 0; 1864 u_long hdrsiz; 1865 1866 /* 1867 * In order to avoid defeating path MTU discovery on the peer, 1868 * we advertise the max MTU of all attached networks as our MSS, 1869 * per RFC 1191, section 3.1. 1870 * 1871 * We provide the option to advertise just the MTU of 1872 * the interface on which we hope this connection will 1873 * be receiving. If we are responding to a SYN, we 1874 * will have a pretty good idea about this, but when 1875 * initiating a connection there is a bit more doubt. 1876 * 1877 * We also need to ensure that loopback has a large enough 1878 * MSS, as the loopback MTU is never included in in_maxmtu. 1879 */ 1880 1881 if (ifp != NULL) 1882 switch (af) { 1883 case AF_INET: 1884 mss = ifp->if_mtu; 1885 break; 1886 #ifdef INET6 1887 case AF_INET6: 1888 mss = IN6_LINKMTU(ifp); 1889 break; 1890 #endif 1891 } 1892 1893 if (tcp_mss_ifmtu == 0) 1894 switch (af) { 1895 case AF_INET: 1896 mss = max(in_maxmtu, mss); 1897 break; 1898 #ifdef INET6 1899 case AF_INET6: 1900 mss = max(in6_maxmtu, mss); 1901 break; 1902 #endif 1903 } 1904 1905 switch (af) { 1906 case AF_INET: 1907 hdrsiz = sizeof(struct ip); 1908 break; 1909 #ifdef INET6 1910 case AF_INET6: 1911 hdrsiz = sizeof(struct ip6_hdr); 1912 break; 1913 #endif 1914 default: 1915 hdrsiz = 0; 1916 break; 1917 } 1918 hdrsiz += sizeof(struct tcphdr); 1919 if (mss > hdrsiz) 1920 mss -= hdrsiz; 1921 1922 mss = max(tcp_mssdflt, mss); 1923 return (mss); 1924 } 1925 1926 /* 1927 * Set connection variables based on the peer's advertised MSS. 1928 * We are passed the TCPCB for the actual connection. If we 1929 * are the server, we are called by the compressed state engine 1930 * when the 3-way handshake is complete. If we are the client, 1931 * we are called when we receive the SYN,ACK from the server. 1932 * 1933 * NOTE: Our advertised MSS value must be initialized in the TCPCB 1934 * before this routine is called! 1935 */ 1936 void 1937 tcp_mss_from_peer(struct tcpcb *tp, int offer) 1938 { 1939 struct socket *so; 1940 #if defined(RTV_SPIPE) || defined(RTV_SSTHRESH) 1941 struct rtentry *rt; 1942 #endif 1943 u_long bufsize; 1944 int mss; 1945 1946 #ifdef DIAGNOSTIC 1947 if (tp->t_inpcb && tp->t_in6pcb) 1948 panic("tcp_mss_from_peer: both t_inpcb and t_in6pcb are set"); 1949 #endif 1950 so = NULL; 1951 rt = NULL; 1952 #ifdef INET 1953 if (tp->t_inpcb) { 1954 so = tp->t_inpcb->inp_socket; 1955 #if defined(RTV_SPIPE) || defined(RTV_SSTHRESH) 1956 rt = in_pcbrtentry(tp->t_inpcb); 1957 #endif 1958 } 1959 #endif 1960 #ifdef INET6 1961 if (tp->t_in6pcb) { 1962 so = tp->t_in6pcb->in6p_socket; 1963 #if defined(RTV_SPIPE) || defined(RTV_SSTHRESH) 1964 rt = in6_pcbrtentry(tp->t_in6pcb); 1965 #endif 1966 } 1967 #endif 1968 1969 /* 1970 * As per RFC1122, use the default MSS value, unless they 1971 * sent us an offer. Do not accept offers less than 256 bytes. 1972 */ 1973 mss = tcp_mssdflt; 1974 if (offer) 1975 mss = offer; 1976 mss = max(mss, 256); /* sanity */ 1977 tp->t_peermss = mss; 1978 mss -= tcp_optlen(tp); 1979 #ifdef INET 1980 if (tp->t_inpcb) 1981 mss -= ip_optlen(tp->t_inpcb); 1982 #endif 1983 #ifdef INET6 1984 if (tp->t_in6pcb) 1985 mss -= ip6_optlen(tp->t_in6pcb); 1986 #endif 1987 1988 /* 1989 * If there's a pipesize, change the socket buffer to that size. 1990 * Make the socket buffer an integral number of MSS units. If 1991 * the MSS is larger than the socket buffer, artificially decrease 1992 * the MSS. 1993 */ 1994 #ifdef RTV_SPIPE 1995 if (rt != NULL && rt->rt_rmx.rmx_sendpipe != 0) 1996 bufsize = rt->rt_rmx.rmx_sendpipe; 1997 else 1998 #endif 1999 { 2000 KASSERT(so != NULL); 2001 bufsize = so->so_snd.sb_hiwat; 2002 } 2003 if (bufsize < mss) 2004 mss = bufsize; 2005 else { 2006 bufsize = roundup(bufsize, mss); 2007 if (bufsize > sb_max) 2008 bufsize = sb_max; 2009 (void) sbreserve(&so->so_snd, bufsize, so); 2010 } 2011 tp->t_segsz = mss; 2012 2013 #ifdef RTV_SSTHRESH 2014 if (rt != NULL && rt->rt_rmx.rmx_ssthresh) { 2015 /* 2016 * There's some sort of gateway or interface buffer 2017 * limit on the path. Use this to set the slow 2018 * start threshold, but set the threshold to no less 2019 * than 2 * MSS. 2020 */ 2021 tp->snd_ssthresh = max(2 * mss, rt->rt_rmx.rmx_ssthresh); 2022 } 2023 #endif 2024 } 2025 2026 /* 2027 * Processing necessary when a TCP connection is established. 2028 */ 2029 void 2030 tcp_established(struct tcpcb *tp) 2031 { 2032 struct socket *so; 2033 #ifdef RTV_RPIPE 2034 struct rtentry *rt; 2035 #endif 2036 u_long bufsize; 2037 2038 #ifdef DIAGNOSTIC 2039 if (tp->t_inpcb && tp->t_in6pcb) 2040 panic("tcp_established: both t_inpcb and t_in6pcb are set"); 2041 #endif 2042 so = NULL; 2043 rt = NULL; 2044 #ifdef INET 2045 /* This is a while() to reduce the dreadful stairstepping below */ 2046 while (tp->t_inpcb) { 2047 so = tp->t_inpcb->inp_socket; 2048 #if defined(RTV_RPIPE) 2049 rt = in_pcbrtentry(tp->t_inpcb); 2050 #endif 2051 if (__predict_true(tcp_msl_enable)) { 2052 if (tp->t_inpcb->inp_laddr.s_addr == INADDR_LOOPBACK) { 2053 tp->t_msl = tcp_msl_loop ? tcp_msl_loop : (TCPTV_MSL >> 2); 2054 break; 2055 } 2056 2057 if (__predict_false(tcp_rttlocal)) { 2058 /* This may be adjusted by tcp_input */ 2059 tp->t_msl = tcp_msl_local ? tcp_msl_local : (TCPTV_MSL >> 1); 2060 break; 2061 } 2062 if (in_localaddr(tp->t_inpcb->inp_faddr)) { 2063 tp->t_msl = tcp_msl_local ? tcp_msl_local : (TCPTV_MSL >> 1); 2064 break; 2065 } 2066 } 2067 tp->t_msl = tcp_msl_remote ? tcp_msl_remote : TCPTV_MSL; 2068 break; 2069 } 2070 #endif 2071 #ifdef INET6 2072 /* The !tp->t_inpcb lets the compiler know it can't be v4 *and* v6 */ 2073 while (!tp->t_inpcb && tp->t_in6pcb) { 2074 so = tp->t_in6pcb->in6p_socket; 2075 #if defined(RTV_RPIPE) 2076 rt = in6_pcbrtentry(tp->t_in6pcb); 2077 #endif 2078 if (__predict_true(tcp_msl_enable)) { 2079 extern const struct in6_addr in6addr_loopback; 2080 2081 if (IN6_ARE_ADDR_EQUAL(&tp->t_in6pcb->in6p_laddr, 2082 &in6addr_loopback)) { 2083 tp->t_msl = tcp_msl_loop ? tcp_msl_loop : (TCPTV_MSL >> 2); 2084 break; 2085 } 2086 2087 if (__predict_false(tcp_rttlocal)) { 2088 /* This may be adjusted by tcp_input */ 2089 tp->t_msl = tcp_msl_local ? tcp_msl_local : (TCPTV_MSL >> 1); 2090 break; 2091 } 2092 if (in6_localaddr(&tp->t_in6pcb->in6p_faddr)) { 2093 tp->t_msl = tcp_msl_local ? tcp_msl_local : (TCPTV_MSL >> 1); 2094 break; 2095 } 2096 } 2097 tp->t_msl = tcp_msl_remote ? tcp_msl_remote : TCPTV_MSL; 2098 break; 2099 } 2100 #endif 2101 2102 tp->t_state = TCPS_ESTABLISHED; 2103 TCP_TIMER_ARM(tp, TCPT_KEEP, tp->t_keepidle); 2104 2105 #ifdef RTV_RPIPE 2106 if (rt != NULL && rt->rt_rmx.rmx_recvpipe != 0) 2107 bufsize = rt->rt_rmx.rmx_recvpipe; 2108 else 2109 #endif 2110 { 2111 KASSERT(so != NULL); 2112 bufsize = so->so_rcv.sb_hiwat; 2113 } 2114 if (bufsize > tp->t_ourmss) { 2115 bufsize = roundup(bufsize, tp->t_ourmss); 2116 if (bufsize > sb_max) 2117 bufsize = sb_max; 2118 (void) sbreserve(&so->so_rcv, bufsize, so); 2119 } 2120 } 2121 2122 /* 2123 * Check if there's an initial rtt or rttvar. Convert from the 2124 * route-table units to scaled multiples of the slow timeout timer. 2125 * Called only during the 3-way handshake. 2126 */ 2127 void 2128 tcp_rmx_rtt(struct tcpcb *tp) 2129 { 2130 #ifdef RTV_RTT 2131 struct rtentry *rt = NULL; 2132 int rtt; 2133 2134 #ifdef DIAGNOSTIC 2135 if (tp->t_inpcb && tp->t_in6pcb) 2136 panic("tcp_rmx_rtt: both t_inpcb and t_in6pcb are set"); 2137 #endif 2138 #ifdef INET 2139 if (tp->t_inpcb) 2140 rt = in_pcbrtentry(tp->t_inpcb); 2141 #endif 2142 #ifdef INET6 2143 if (tp->t_in6pcb) 2144 rt = in6_pcbrtentry(tp->t_in6pcb); 2145 #endif 2146 if (rt == NULL) 2147 return; 2148 2149 if (tp->t_srtt == 0 && (rtt = rt->rt_rmx.rmx_rtt)) { 2150 /* 2151 * XXX The lock bit for MTU indicates that the value 2152 * is also a minimum value; this is subject to time. 2153 */ 2154 if (rt->rt_rmx.rmx_locks & RTV_RTT) 2155 TCPT_RANGESET(tp->t_rttmin, 2156 rtt / (RTM_RTTUNIT / PR_SLOWHZ), 2157 TCPTV_MIN, TCPTV_REXMTMAX); 2158 tp->t_srtt = rtt / 2159 ((RTM_RTTUNIT / PR_SLOWHZ) >> (TCP_RTT_SHIFT + 2)); 2160 if (rt->rt_rmx.rmx_rttvar) { 2161 tp->t_rttvar = rt->rt_rmx.rmx_rttvar / 2162 ((RTM_RTTUNIT / PR_SLOWHZ) >> 2163 (TCP_RTTVAR_SHIFT + 2)); 2164 } else { 2165 /* Default variation is +- 1 rtt */ 2166 tp->t_rttvar = 2167 tp->t_srtt >> (TCP_RTT_SHIFT - TCP_RTTVAR_SHIFT); 2168 } 2169 TCPT_RANGESET(tp->t_rxtcur, 2170 ((tp->t_srtt >> 2) + tp->t_rttvar) >> (1 + 2), 2171 tp->t_rttmin, TCPTV_REXMTMAX); 2172 } 2173 #endif 2174 } 2175 2176 tcp_seq tcp_iss_seq = 0; /* tcp initial seq # */ 2177 u_int8_t tcp_iss_secret[16]; /* 128 bits; should be plenty */ 2178 2179 /* 2180 * Get a new sequence value given a tcp control block 2181 */ 2182 tcp_seq 2183 tcp_new_iss(struct tcpcb *tp, tcp_seq addin) 2184 { 2185 2186 #ifdef INET 2187 if (tp->t_inpcb != NULL) { 2188 return (tcp_new_iss1(&tp->t_inpcb->inp_laddr, 2189 &tp->t_inpcb->inp_faddr, tp->t_inpcb->inp_lport, 2190 tp->t_inpcb->inp_fport, sizeof(tp->t_inpcb->inp_laddr), 2191 addin)); 2192 } 2193 #endif 2194 #ifdef INET6 2195 if (tp->t_in6pcb != NULL) { 2196 return (tcp_new_iss1(&tp->t_in6pcb->in6p_laddr, 2197 &tp->t_in6pcb->in6p_faddr, tp->t_in6pcb->in6p_lport, 2198 tp->t_in6pcb->in6p_fport, sizeof(tp->t_in6pcb->in6p_laddr), 2199 addin)); 2200 } 2201 #endif 2202 /* Not possible. */ 2203 panic("tcp_new_iss"); 2204 } 2205 2206 /* 2207 * This routine actually generates a new TCP initial sequence number. 2208 */ 2209 tcp_seq 2210 tcp_new_iss1(void *laddr, void *faddr, u_int16_t lport, u_int16_t fport, 2211 size_t addrsz, tcp_seq addin) 2212 { 2213 tcp_seq tcp_iss; 2214 2215 static bool tcp_iss_gotten_secret; 2216 2217 /* 2218 * If we haven't been here before, initialize our cryptographic 2219 * hash secret. 2220 */ 2221 if (tcp_iss_gotten_secret == false) { 2222 cprng_strong(kern_cprng, 2223 tcp_iss_secret, sizeof(tcp_iss_secret), 0); 2224 tcp_iss_gotten_secret = true; 2225 } 2226 2227 if (tcp_do_rfc1948) { 2228 MD5_CTX ctx; 2229 u_int8_t hash[16]; /* XXX MD5 knowledge */ 2230 2231 /* 2232 * Compute the base value of the ISS. It is a hash 2233 * of (saddr, sport, daddr, dport, secret). 2234 */ 2235 MD5Init(&ctx); 2236 2237 MD5Update(&ctx, (u_char *) laddr, addrsz); 2238 MD5Update(&ctx, (u_char *) &lport, sizeof(lport)); 2239 2240 MD5Update(&ctx, (u_char *) faddr, addrsz); 2241 MD5Update(&ctx, (u_char *) &fport, sizeof(fport)); 2242 2243 MD5Update(&ctx, tcp_iss_secret, sizeof(tcp_iss_secret)); 2244 2245 MD5Final(hash, &ctx); 2246 2247 memcpy(&tcp_iss, hash, sizeof(tcp_iss)); 2248 2249 /* 2250 * Now increment our "timer", and add it in to 2251 * the computed value. 2252 * 2253 * XXX Use `addin'? 2254 * XXX TCP_ISSINCR too large to use? 2255 */ 2256 tcp_iss_seq += TCP_ISSINCR; 2257 #ifdef TCPISS_DEBUG 2258 printf("ISS hash 0x%08x, ", tcp_iss); 2259 #endif 2260 tcp_iss += tcp_iss_seq + addin; 2261 #ifdef TCPISS_DEBUG 2262 printf("new ISS 0x%08x\n", tcp_iss); 2263 #endif 2264 } else { 2265 /* 2266 * Randomize. 2267 */ 2268 tcp_iss = cprng_fast32(); 2269 2270 /* 2271 * If we were asked to add some amount to a known value, 2272 * we will take a random value obtained above, mask off 2273 * the upper bits, and add in the known value. We also 2274 * add in a constant to ensure that we are at least a 2275 * certain distance from the original value. 2276 * 2277 * This is used when an old connection is in timed wait 2278 * and we have a new one coming in, for instance. 2279 */ 2280 if (addin != 0) { 2281 #ifdef TCPISS_DEBUG 2282 printf("Random %08x, ", tcp_iss); 2283 #endif 2284 tcp_iss &= TCP_ISS_RANDOM_MASK; 2285 tcp_iss += addin + TCP_ISSINCR; 2286 #ifdef TCPISS_DEBUG 2287 printf("Old ISS %08x, ISS %08x\n", addin, tcp_iss); 2288 #endif 2289 } else { 2290 tcp_iss &= TCP_ISS_RANDOM_MASK; 2291 tcp_iss += tcp_iss_seq; 2292 tcp_iss_seq += TCP_ISSINCR; 2293 #ifdef TCPISS_DEBUG 2294 printf("ISS %08x\n", tcp_iss); 2295 #endif 2296 } 2297 } 2298 2299 if (tcp_compat_42) { 2300 /* 2301 * Limit it to the positive range for really old TCP 2302 * implementations. 2303 * Just AND off the top bit instead of checking if 2304 * is set first - saves a branch 50% of the time. 2305 */ 2306 tcp_iss &= 0x7fffffff; /* XXX */ 2307 } 2308 2309 return (tcp_iss); 2310 } 2311 2312 #if defined(IPSEC) || defined(FAST_IPSEC) 2313 /* compute ESP/AH header size for TCP, including outer IP header. */ 2314 size_t 2315 ipsec4_hdrsiz_tcp(struct tcpcb *tp) 2316 { 2317 struct inpcb *inp; 2318 size_t hdrsiz; 2319 2320 /* XXX mapped addr case (tp->t_in6pcb) */ 2321 if (!tp || !tp->t_template || !(inp = tp->t_inpcb)) 2322 return 0; 2323 switch (tp->t_family) { 2324 case AF_INET: 2325 /* XXX: should use currect direction. */ 2326 hdrsiz = ipsec4_hdrsiz(tp->t_template, IPSEC_DIR_OUTBOUND, inp); 2327 break; 2328 default: 2329 hdrsiz = 0; 2330 break; 2331 } 2332 2333 return hdrsiz; 2334 } 2335 2336 #ifdef INET6 2337 size_t 2338 ipsec6_hdrsiz_tcp(struct tcpcb *tp) 2339 { 2340 struct in6pcb *in6p; 2341 size_t hdrsiz; 2342 2343 if (!tp || !tp->t_template || !(in6p = tp->t_in6pcb)) 2344 return 0; 2345 switch (tp->t_family) { 2346 case AF_INET6: 2347 /* XXX: should use currect direction. */ 2348 hdrsiz = ipsec6_hdrsiz(tp->t_template, IPSEC_DIR_OUTBOUND, in6p); 2349 break; 2350 case AF_INET: 2351 /* mapped address case - tricky */ 2352 default: 2353 hdrsiz = 0; 2354 break; 2355 } 2356 2357 return hdrsiz; 2358 } 2359 #endif 2360 #endif /*IPSEC*/ 2361 2362 /* 2363 * Determine the length of the TCP options for this connection. 2364 * 2365 * XXX: What do we do for SACK, when we add that? Just reserve 2366 * all of the space? Otherwise we can't exactly be incrementing 2367 * cwnd by an amount that varies depending on the amount we last 2368 * had to SACK! 2369 */ 2370 2371 u_int 2372 tcp_optlen(struct tcpcb *tp) 2373 { 2374 u_int optlen; 2375 2376 optlen = 0; 2377 if ((tp->t_flags & (TF_REQ_TSTMP|TF_RCVD_TSTMP|TF_NOOPT)) == 2378 (TF_REQ_TSTMP | TF_RCVD_TSTMP)) 2379 optlen += TCPOLEN_TSTAMP_APPA; 2380 2381 #ifdef TCP_SIGNATURE 2382 if (tp->t_flags & TF_SIGNATURE) 2383 optlen += TCPOLEN_SIGNATURE + 2; 2384 #endif /* TCP_SIGNATURE */ 2385 2386 return optlen; 2387 } 2388 2389 u_int 2390 tcp_hdrsz(struct tcpcb *tp) 2391 { 2392 u_int hlen; 2393 2394 switch (tp->t_family) { 2395 #ifdef INET6 2396 case AF_INET6: 2397 hlen = sizeof(struct ip6_hdr); 2398 break; 2399 #endif 2400 case AF_INET: 2401 hlen = sizeof(struct ip); 2402 break; 2403 default: 2404 hlen = 0; 2405 break; 2406 } 2407 hlen += sizeof(struct tcphdr); 2408 2409 if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP && 2410 (tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP) 2411 hlen += TCPOLEN_TSTAMP_APPA; 2412 #ifdef TCP_SIGNATURE 2413 if (tp->t_flags & TF_SIGNATURE) 2414 hlen += TCPOLEN_SIGLEN; 2415 #endif 2416 return hlen; 2417 } 2418 2419 void 2420 tcp_statinc(u_int stat) 2421 { 2422 2423 KASSERT(stat < TCP_NSTATS); 2424 TCP_STATINC(stat); 2425 } 2426 2427 void 2428 tcp_statadd(u_int stat, uint64_t val) 2429 { 2430 2431 KASSERT(stat < TCP_NSTATS); 2432 TCP_STATADD(stat, val); 2433 } 2434
Indexes created Tue Sep 23 02:09:52 GMT 2025