1 /* $OpenBSD: in6_pcb.c,v 1.112 2021/02/11 10:41:19 patrick 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) 1982, 1986, 1990, 1993, 1995 74 * Regents of the University of California. All rights reserved. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. Neither the name of the University nor the names of its contributors 85 * may be used to endorse or promote products derived from this software 86 * without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 89 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 91 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 94 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 95 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 96 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 97 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 98 * SUCH DAMAGE. 99 * 100 */ 101 102 #include "pf.h" 103 #include "stoeplitz.h" 104 105 #include <sys/param.h> 106 #include <sys/systm.h> 107 #include <sys/mbuf.h> 108 #include <sys/protosw.h> 109 #include <sys/socket.h> 110 #include <sys/socketvar.h> 111 112 #include <net/if.h> 113 #include <net/if_var.h> 114 #include <net/pfvar.h> 115 116 #include <netinet/in.h> 117 #include <netinet/ip.h> 118 #include <netinet/ip_var.h> 119 #include <netinet/in_pcb.h> 120 121 #include <netinet6/in6_var.h> 122 123 #if NSTOEPLITZ > 0 124 #include <net/toeplitz.h> 125 #endif 126 127 const struct in6_addr zeroin6_addr; 128 129 struct inpcbhead * 130 in6_pcbhash(struct inpcbtable *table, int rdom, 131 const struct in6_addr *faddr, u_short fport, 132 const struct in6_addr *laddr, u_short lport) 133 { 134 SIPHASH_CTX ctx; 135 u_int32_t nrdom = htonl(rdom); 136 137 SipHash24_Init(&ctx, &table->inpt_key); 138 SipHash24_Update(&ctx, &nrdom, sizeof(nrdom)); 139 SipHash24_Update(&ctx, faddr, sizeof(*faddr)); 140 SipHash24_Update(&ctx, &fport, sizeof(fport)); 141 SipHash24_Update(&ctx, laddr, sizeof(*laddr)); 142 SipHash24_Update(&ctx, &lport, sizeof(lport)); 143 144 return (&table->inpt_hashtbl[SipHash24_End(&ctx) & table->inpt_mask]); 145 } 146 147 int 148 in6_pcbaddrisavail(struct inpcb *inp, struct sockaddr_in6 *sin6, int wild, 149 struct proc *p) 150 { 151 struct socket *so = inp->inp_socket; 152 struct inpcbtable *table = inp->inp_table; 153 u_short lport = sin6->sin6_port; 154 int reuseport = (so->so_options & SO_REUSEPORT); 155 156 wild |= INPLOOKUP_IPV6; 157 /* KAME hack: embed scopeid */ 158 if (in6_embedscope(&sin6->sin6_addr, sin6, inp) != 0) 159 return (EINVAL); 160 /* this must be cleared for ifa_ifwithaddr() */ 161 sin6->sin6_scope_id = 0; 162 /* reject IPv4 mapped address, we have no support for it */ 163 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 164 return (EADDRNOTAVAIL); 165 166 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 167 /* 168 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 169 * allow complete duplication of binding if 170 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 171 * and a multicast address is bound on both 172 * new and duplicated sockets. 173 */ 174 if (so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) 175 reuseport = SO_REUSEADDR | SO_REUSEPORT; 176 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 177 struct ifaddr *ifa = NULL; 178 179 sin6->sin6_port = 0; /* 180 * Yechhhh, because of upcoming 181 * call to ifa_ifwithaddr(), which 182 * does bcmp's over the PORTS as 183 * well. (What about flow?) 184 */ 185 sin6->sin6_flowinfo = 0; 186 if (!(so->so_options & SO_BINDANY) && 187 (ifa = ifa_ifwithaddr(sin6tosa(sin6), 188 inp->inp_rtableid)) == NULL) 189 return (EADDRNOTAVAIL); 190 sin6->sin6_port = lport; 191 192 /* 193 * bind to an anycast address might accidentally 194 * cause sending a packet with an anycast source 195 * address, so we forbid it. 196 * 197 * We should allow to bind to a deprecated address, 198 * since the application dare to use it. 199 * But, can we assume that they are careful enough 200 * to check if the address is deprecated or not? 201 * Maybe, as a safeguard, we should have a setsockopt 202 * flag to control the bind(2) behavior against 203 * deprecated addresses (default: forbid bind(2)). 204 */ 205 if (ifa && ifatoia6(ifa)->ia6_flags & (IN6_IFF_ANYCAST| 206 IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED|IN6_IFF_DETACHED)) 207 return (EADDRNOTAVAIL); 208 } 209 if (lport) { 210 struct inpcb *t; 211 212 if (so->so_euid) { 213 t = in_pcblookup_local(table, 214 (struct in_addr *)&sin6->sin6_addr, lport, 215 INPLOOKUP_WILDCARD | INPLOOKUP_IPV6, 216 inp->inp_rtableid); 217 if (t && (so->so_euid != t->inp_socket->so_euid)) 218 return (EADDRINUSE); 219 } 220 t = in_pcblookup_local(table, 221 (struct in_addr *)&sin6->sin6_addr, lport, 222 wild, inp->inp_rtableid); 223 if (t && (reuseport & t->inp_socket->so_options) == 0) 224 return (EADDRINUSE); 225 } 226 return (0); 227 } 228 229 /* 230 * Connect from a socket to a specified address. 231 * Both address and port must be specified in argument sin6. 232 * Eventually, flow labels will have to be dealt with here, as well. 233 * 234 * If don't have a local address for this socket yet, 235 * then pick one. 236 */ 237 int 238 in6_pcbconnect(struct inpcb *inp, struct mbuf *nam) 239 { 240 struct in6_addr *in6a = NULL; 241 struct sockaddr_in6 *sin6; 242 int error; 243 struct sockaddr_in6 tmp; 244 245 KASSERT(inp->inp_flags & INP_IPV6); 246 247 if ((error = in6_nam2sin6(nam, &sin6))) 248 return (error); 249 if (sin6->sin6_port == 0) 250 return (EADDRNOTAVAIL); 251 /* reject IPv4 mapped address, we have no support for it */ 252 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 253 return (EADDRNOTAVAIL); 254 255 /* protect *sin6 from overwrites */ 256 tmp = *sin6; 257 sin6 = &tmp; 258 259 /* KAME hack: embed scopeid */ 260 if (in6_embedscope(&sin6->sin6_addr, sin6, inp) != 0) 261 return EINVAL; 262 /* this must be cleared for ifa_ifwithaddr() */ 263 sin6->sin6_scope_id = 0; 264 265 /* Source address selection. */ 266 /* 267 * XXX: in6_selectsrc might replace the bound local address 268 * with the address specified by setsockopt(IPV6_PKTINFO). 269 * Is it the intended behavior? 270 */ 271 error = in6_pcbselsrc(&in6a, sin6, inp, inp->inp_outputopts6); 272 if (error) 273 return (error); 274 275 inp->inp_ipv6.ip6_hlim = (u_int8_t)in6_selecthlim(inp); 276 277 if (in6_pcbhashlookup(inp->inp_table, &sin6->sin6_addr, sin6->sin6_port, 278 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) ? in6a : &inp->inp_laddr6, 279 inp->inp_lport, inp->inp_rtableid) != NULL) { 280 return (EADDRINUSE); 281 } 282 283 KASSERT(IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) || inp->inp_lport); 284 285 if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) { 286 if (inp->inp_lport == 0) { 287 error = in_pcbbind(inp, NULL, curproc); 288 if (error) 289 return (error); 290 if (in6_pcbhashlookup(inp->inp_table, &sin6->sin6_addr, 291 sin6->sin6_port, in6a, inp->inp_lport, 292 inp->inp_rtableid) != NULL) { 293 inp->inp_lport = 0; 294 return (EADDRINUSE); 295 } 296 } 297 inp->inp_laddr6 = *in6a; 298 } 299 inp->inp_faddr6 = sin6->sin6_addr; 300 inp->inp_fport = sin6->sin6_port; 301 inp->inp_flowinfo &= ~IPV6_FLOWLABEL_MASK; 302 if (ip6_auto_flowlabel) 303 inp->inp_flowinfo |= 304 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 305 #if NSTOEPLITZ > 0 306 inp->inp_flowid = stoeplitz_ip6port(&inp->inp_faddr6, 307 &inp->inp_laddr6, inp->inp_fport, inp->inp_lport); 308 #endif 309 in_pcbrehash(inp); 310 return (0); 311 } 312 313 /* 314 * Get the local address/port, and put it in a sockaddr_in6. 315 * This services the getsockname(2) call. 316 */ 317 void 318 in6_setsockaddr(struct inpcb *inp, struct mbuf *nam) 319 { 320 struct sockaddr_in6 *sin6; 321 322 nam->m_len = sizeof(struct sockaddr_in6); 323 sin6 = mtod(nam,struct sockaddr_in6 *); 324 325 bzero ((caddr_t)sin6,sizeof(struct sockaddr_in6)); 326 sin6->sin6_family = AF_INET6; 327 sin6->sin6_len = sizeof(struct sockaddr_in6); 328 sin6->sin6_port = inp->inp_lport; 329 sin6->sin6_addr = inp->inp_laddr6; 330 /* KAME hack: recover scopeid */ 331 in6_recoverscope(sin6, &inp->inp_laddr6); 332 } 333 334 /* 335 * Get the foreign address/port, and put it in a sockaddr_in6. 336 * This services the getpeername(2) call. 337 */ 338 void 339 in6_setpeeraddr(struct inpcb *inp, struct mbuf *nam) 340 { 341 struct sockaddr_in6 *sin6; 342 343 nam->m_len = sizeof(struct sockaddr_in6); 344 sin6 = mtod(nam,struct sockaddr_in6 *); 345 346 bzero ((caddr_t)sin6,sizeof(struct sockaddr_in6)); 347 sin6->sin6_family = AF_INET6; 348 sin6->sin6_len = sizeof(struct sockaddr_in6); 349 sin6->sin6_port = inp->inp_fport; 350 sin6->sin6_addr = inp->inp_faddr6; 351 /* KAME hack: recover scopeid */ 352 in6_recoverscope(sin6, &inp->inp_faddr6); 353 } 354 355 /* 356 * Pass some notification to all connections of a protocol 357 * associated with address dst. The local address and/or port numbers 358 * may be specified to limit the search. The "usual action" will be 359 * taken, depending on the ctlinput cmd. The caller must filter any 360 * cmds that are uninteresting (e.g., no error in the map). 361 * Call the protocol specific routine (if any) to report 362 * any errors for each matching socket. 363 * 364 * Also perform input-side security policy check 365 * once PCB to be notified has been located. 366 */ 367 int 368 in6_pcbnotify(struct inpcbtable *table, struct sockaddr_in6 *dst, 369 uint fport_arg, const struct sockaddr_in6 *src, uint lport_arg, 370 u_int rtable, int cmd, void *cmdarg, void (*notify)(struct inpcb *, int)) 371 { 372 struct inpcb *inp, *ninp; 373 u_short fport = fport_arg, lport = lport_arg; 374 struct sockaddr_in6 sa6_src; 375 int errno, nmatch = 0; 376 u_int32_t flowinfo; 377 u_int rdomain; 378 379 NET_ASSERT_LOCKED(); 380 381 if ((unsigned)cmd >= PRC_NCMDS) 382 return (0); 383 384 if (IN6_IS_ADDR_UNSPECIFIED(&dst->sin6_addr)) 385 return (0); 386 if (IN6_IS_ADDR_V4MAPPED(&dst->sin6_addr)) { 387 #ifdef DIAGNOSTIC 388 printf("%s: Huh? Thought we never got " 389 "called with mapped!\n", __func__); 390 #endif 391 return (0); 392 } 393 394 /* 395 * note that src can be NULL when we get notify by local fragmentation. 396 */ 397 sa6_src = (src == NULL) ? sa6_any : *src; 398 flowinfo = sa6_src.sin6_flowinfo; 399 400 /* 401 * Redirects go to all references to the destination, 402 * and use in_rtchange to invalidate the route cache. 403 * Dead host indications: also use in_rtchange to invalidate 404 * the cache, and deliver the error to all the sockets. 405 * Otherwise, if we have knowledge of the local port and address, 406 * deliver only to that socket. 407 */ 408 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 409 fport = 0; 410 lport = 0; 411 sa6_src.sin6_addr = in6addr_any; 412 413 if (cmd != PRC_HOSTDEAD) 414 notify = in_rtchange; 415 } 416 errno = inet6ctlerrmap[cmd]; 417 418 rdomain = rtable_l2(rtable); 419 TAILQ_FOREACH_SAFE(inp, &table->inpt_queue, inp_queue, ninp) { 420 if ((inp->inp_flags & INP_IPV6) == 0) 421 continue; 422 423 /* 424 * Under the following condition, notify of redirects 425 * to the pcb, without making address matches against inpcb. 426 * - redirect notification is arrived. 427 * - the inpcb is unconnected. 428 * - the inpcb is caching !RTF_HOST routing entry. 429 * - the ICMPv6 notification is from the gateway cached in the 430 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 431 * the inpcb used very recently. 432 * 433 * This is to improve interaction between netbsd/openbsd 434 * redirect handling code, and inpcb route cache code. 435 * without the clause, !RTF_HOST routing entry (which carries 436 * gateway used by inpcb right before the ICMPv6 redirect) 437 * will be cached forever in unconnected inpcb. 438 * 439 * There still is a question regarding to what is TRT: 440 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 441 * generated on packet output. inpcb will always cache 442 * RTF_HOST routing entry so there's no need for the clause 443 * (ICMPv6 redirect will update RTF_HOST routing entry, 444 * and inpcb is caching it already). 445 * However, bsdi/freebsd are vulnerable to local DoS attacks 446 * due to the cloned routing entries. 447 * - Specwise, "destination cache" is mentioned in RFC2461. 448 * Jinmei says that it implies bsdi/freebsd behavior, itojun 449 * is not really convinced. 450 * - Having hiwat/lowat on # of cloned host route (redirect/ 451 * pmtud) may be a good idea. netbsd/openbsd has it. see 452 * icmp6_mtudisc_update(). 453 */ 454 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 455 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) && 456 inp->inp_route.ro_rt && 457 !(inp->inp_route.ro_rt->rt_flags & RTF_HOST)) { 458 struct sockaddr_in6 *dst6; 459 460 dst6 = satosin6(&inp->inp_route.ro_dst); 461 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 462 &dst->sin6_addr)) 463 goto do_notify; 464 } 465 466 /* 467 * Detect if we should notify the error. If no source and 468 * destination ports are specified, but non-zero flowinfo and 469 * local address match, notify the error. This is the case 470 * when the error is delivered with an encrypted buffer 471 * by ESP. Otherwise, just compare addresses and ports 472 * as usual. 473 */ 474 if (lport == 0 && fport == 0 && flowinfo && 475 inp->inp_socket != NULL && 476 flowinfo == (inp->inp_flowinfo & IPV6_FLOWLABEL_MASK) && 477 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, &sa6_src.sin6_addr)) 478 goto do_notify; 479 else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, 480 &dst->sin6_addr) || 481 rtable_l2(inp->inp_rtableid) != rdomain || 482 inp->inp_socket == NULL || 483 (lport && inp->inp_lport != lport) || 484 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 485 !IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, 486 &sa6_src.sin6_addr)) || 487 (fport && inp->inp_fport != fport)) { 488 continue; 489 } 490 do_notify: 491 nmatch++; 492 if (notify) 493 (*notify)(inp, errno); 494 } 495 return (nmatch); 496 } 497 498 struct inpcb * 499 in6_pcbhashlookup(struct inpcbtable *table, const struct in6_addr *faddr, 500 u_int fport_arg, const struct in6_addr *laddr, u_int lport_arg, 501 u_int rtable) 502 { 503 struct inpcbhead *head; 504 struct inpcb *inp; 505 u_int16_t fport = fport_arg, lport = lport_arg; 506 u_int rdomain; 507 508 rdomain = rtable_l2(rtable); 509 head = in6_pcbhash(table, rdomain, faddr, fport, laddr, lport); 510 LIST_FOREACH(inp, head, inp_hash) { 511 if (!(inp->inp_flags & INP_IPV6)) 512 continue; 513 if (IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, faddr) && 514 inp->inp_fport == fport && inp->inp_lport == lport && 515 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr) && 516 rtable_l2(inp->inp_rtableid) == rdomain) { 517 /* 518 * Move this PCB to the head of hash chain so that 519 * repeated accesses are quicker. This is analogous to 520 * the historic single-entry PCB cache. 521 */ 522 if (inp != LIST_FIRST(head)) { 523 LIST_REMOVE(inp, inp_hash); 524 LIST_INSERT_HEAD(head, inp, inp_hash); 525 } 526 break; 527 } 528 } 529 #ifdef DIAGNOSTIC 530 if (inp == NULL && in_pcbnotifymiss) { 531 printf("%s: faddr= fport=%d laddr= lport=%d rdom=%u\n", 532 __func__, ntohs(fport), ntohs(lport), rdomain); 533 } 534 #endif 535 return (inp); 536 } 537 538 struct inpcb * 539 in6_pcblookup_listen(struct inpcbtable *table, struct in6_addr *laddr, 540 u_int lport_arg, struct mbuf *m, u_int rtable) 541 { 542 struct inpcbhead *head; 543 const struct in6_addr *key1, *key2; 544 struct inpcb *inp; 545 u_int16_t lport = lport_arg; 546 u_int rdomain; 547 548 key1 = laddr; 549 key2 = &zeroin6_addr; 550 #if NPF > 0 551 if (m && m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) { 552 struct pf_divert *divert; 553 554 divert = pf_find_divert(m); 555 KASSERT(divert != NULL); 556 switch (divert->type) { 557 case PF_DIVERT_TO: 558 key1 = key2 = &divert->addr.v6; 559 lport = divert->port; 560 break; 561 case PF_DIVERT_REPLY: 562 return (NULL); 563 default: 564 panic("%s: unknown divert type %d, mbuf %p, divert %p", 565 __func__, divert->type, m, divert); 566 } 567 } else if (m && m->m_pkthdr.pf.flags & PF_TAG_TRANSLATE_LOCALHOST) { 568 /* 569 * Redirected connections should not be treated the same 570 * as connections directed to ::1 since localhost 571 * can only be accessed from the host itself. 572 */ 573 key1 = &zeroin6_addr; 574 key2 = laddr; 575 } 576 #endif 577 578 rdomain = rtable_l2(rtable); 579 head = in6_pcbhash(table, rdomain, &zeroin6_addr, 0, key1, lport); 580 LIST_FOREACH(inp, head, inp_hash) { 581 if (!(inp->inp_flags & INP_IPV6)) 582 continue; 583 if (inp->inp_lport == lport && inp->inp_fport == 0 && 584 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, key1) && 585 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6) && 586 rtable_l2(inp->inp_rtableid) == rdomain) 587 break; 588 } 589 if (inp == NULL && ! IN6_ARE_ADDR_EQUAL(key1, key2)) { 590 head = in6_pcbhash(table, rdomain, 591 &zeroin6_addr, 0, key2, lport); 592 LIST_FOREACH(inp, head, inp_hash) { 593 if (!(inp->inp_flags & INP_IPV6)) 594 continue; 595 if (inp->inp_lport == lport && inp->inp_fport == 0 && 596 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, key2) && 597 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6) && 598 rtable_l2(inp->inp_rtableid) == rdomain) 599 break; 600 } 601 } 602 /* 603 * Move this PCB to the head of hash chain so that 604 * repeated accesses are quicker. This is analogous to 605 * the historic single-entry PCB cache. 606 */ 607 if (inp != NULL && inp != LIST_FIRST(head)) { 608 LIST_REMOVE(inp, inp_hash); 609 LIST_INSERT_HEAD(head, inp, inp_hash); 610 } 611 #ifdef DIAGNOSTIC 612 if (inp == NULL && in_pcbnotifymiss) { 613 printf("%s: laddr= lport=%d rdom=%u\n", 614 __func__, ntohs(lport), rdomain); 615 } 616 #endif 617 return (inp); 618 } 619