in6_pcb.c revision 1.109
1/* $OpenBSD: in6_pcb.c,v 1.109 2019/10/17 00:51:28 dlg 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" 103 104#include <sys/param.h> 105#include <sys/systm.h> 106#include <sys/mbuf.h> 107#include <sys/protosw.h> 108#include <sys/socket.h> 109#include <sys/socketvar.h> 110 111#include <net/if.h> 112#include <net/if_var.h> 113#include <net/pfvar.h> 114 115#include <netinet/in.h> 116#include <netinet/ip.h> 117#include <netinet/ip_var.h> 118#include <netinet/in_pcb.h> 119 120#include <netinet6/in6_var.h> 121 122const struct in6_addr zeroin6_addr; 123 124struct inpcbhead * 125in6_pcbhash(struct inpcbtable *table, int rdom, 126 const struct in6_addr *faddr, u_short fport, 127 const struct in6_addr *laddr, u_short lport) 128{ 129 SIPHASH_CTX ctx; 130 u_int32_t nrdom = htonl(rdom); 131 132 SipHash24_Init(&ctx, &table->inpt_key); 133 SipHash24_Update(&ctx, &nrdom, sizeof(nrdom)); 134 SipHash24_Update(&ctx, faddr, sizeof(*faddr)); 135 SipHash24_Update(&ctx, &fport, sizeof(fport)); 136 SipHash24_Update(&ctx, laddr, sizeof(*laddr)); 137 SipHash24_Update(&ctx, &lport, sizeof(lport)); 138 139 return (&table->inpt_hashtbl[SipHash24_End(&ctx) & table->inpt_mask]); 140} 141 142int 143in6_pcbaddrisavail(struct inpcb *inp, struct sockaddr_in6 *sin6, int wild, 144 struct proc *p) 145{ 146 struct socket *so = inp->inp_socket; 147 struct inpcbtable *table = inp->inp_table; 148 u_short lport = sin6->sin6_port; 149 int reuseport = (so->so_options & SO_REUSEPORT); 150 151 wild |= INPLOOKUP_IPV6; 152 /* KAME hack: embed scopeid */ 153 if (in6_embedscope(&sin6->sin6_addr, sin6, inp) != 0) 154 return (EINVAL); 155 /* this must be cleared for ifa_ifwithaddr() */ 156 sin6->sin6_scope_id = 0; 157 /* reject IPv4 mapped address, we have no support for it */ 158 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 159 return (EADDRNOTAVAIL); 160 161 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 162 /* 163 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 164 * allow complete duplication of binding if 165 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 166 * and a multicast address is bound on both 167 * new and duplicated sockets. 168 */ 169 if (so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) 170 reuseport = SO_REUSEADDR | SO_REUSEPORT; 171 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 172 struct ifaddr *ifa = NULL; 173 174 sin6->sin6_port = 0; /* 175 * Yechhhh, because of upcoming 176 * call to ifa_ifwithaddr(), which 177 * does bcmp's over the PORTS as 178 * well. (What about flow?) 179 */ 180 sin6->sin6_flowinfo = 0; 181 if (!(so->so_options & SO_BINDANY) && 182 (ifa = ifa_ifwithaddr(sin6tosa(sin6), 183 inp->inp_rtableid)) == NULL) 184 return (EADDRNOTAVAIL); 185 sin6->sin6_port = lport; 186 187 /* 188 * bind to an anycast address might accidentally 189 * cause sending a packet with an anycast source 190 * address, so we forbid it. 191 * 192 * We should allow to bind to a deprecated address, 193 * since the application dare to use it. 194 * But, can we assume that they are careful enough 195 * to check if the address is deprecated or not? 196 * Maybe, as a safeguard, we should have a setsockopt 197 * flag to control the bind(2) behavior against 198 * deprecated addresses (default: forbid bind(2)). 199 */ 200 if (ifa && ifatoia6(ifa)->ia6_flags & (IN6_IFF_ANYCAST| 201 IN6_IFF_TENTATIVE|IN6_IFF_DUPLICATED|IN6_IFF_DETACHED)) 202 return (EADDRNOTAVAIL); 203 } 204 if (lport) { 205 struct inpcb *t; 206 207 if (so->so_euid) { 208 t = in_pcblookup_local(table, 209 (struct in_addr *)&sin6->sin6_addr, lport, 210 INPLOOKUP_WILDCARD | INPLOOKUP_IPV6, 211 inp->inp_rtableid); 212 if (t && (so->so_euid != t->inp_socket->so_euid)) 213 return (EADDRINUSE); 214 } 215 t = in_pcblookup_local(table, 216 (struct in_addr *)&sin6->sin6_addr, lport, 217 wild, inp->inp_rtableid); 218 if (t && (reuseport & t->inp_socket->so_options) == 0) 219 return (EADDRINUSE); 220 } 221 return (0); 222} 223 224/* 225 * Connect from a socket to a specified address. 226 * Both address and port must be specified in argument sin6. 227 * Eventually, flow labels will have to be dealt with here, as well. 228 * 229 * If don't have a local address for this socket yet, 230 * then pick one. 231 */ 232int 233in6_pcbconnect(struct inpcb *inp, struct mbuf *nam) 234{ 235 struct in6_addr *in6a = NULL; 236 struct sockaddr_in6 *sin6; 237 int error; 238 struct sockaddr_in6 tmp; 239 240 KASSERT(inp->inp_flags & INP_IPV6); 241 242 if ((error = in6_nam2sin6(nam, &sin6))) 243 return (error); 244 if (sin6->sin6_port == 0) 245 return (EADDRNOTAVAIL); 246 /* reject IPv4 mapped address, we have no support for it */ 247 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 248 return (EADDRNOTAVAIL); 249 250 /* protect *sin6 from overwrites */ 251 tmp = *sin6; 252 sin6 = &tmp; 253 254 /* KAME hack: embed scopeid */ 255 if (in6_embedscope(&sin6->sin6_addr, sin6, inp) != 0) 256 return EINVAL; 257 /* this must be cleared for ifa_ifwithaddr() */ 258 sin6->sin6_scope_id = 0; 259 260 /* Source address selection. */ 261 /* 262 * XXX: in6_selectsrc might replace the bound local address 263 * with the address specified by setsockopt(IPV6_PKTINFO). 264 * Is it the intended behavior? 265 */ 266 error = in6_pcbselsrc(&in6a, sin6, inp, inp->inp_outputopts6); 267 if (error) 268 return (error); 269 270 inp->inp_ipv6.ip6_hlim = (u_int8_t)in6_selecthlim(inp); 271 272 if (in6_pcbhashlookup(inp->inp_table, &sin6->sin6_addr, sin6->sin6_port, 273 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) ? in6a : &inp->inp_laddr6, 274 inp->inp_lport, inp->inp_rtableid) != NULL) { 275 return (EADDRINUSE); 276 } 277 278 KASSERT(IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) || inp->inp_lport); 279 280 if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) { 281 if (inp->inp_lport == 0) { 282 error = in_pcbbind(inp, NULL, curproc); 283 if (error) 284 return (error); 285 if (in6_pcbhashlookup(inp->inp_table, &sin6->sin6_addr, 286 sin6->sin6_port, in6a, inp->inp_lport, 287 inp->inp_rtableid) != NULL) { 288 inp->inp_lport = 0; 289 return (EADDRINUSE); 290 } 291 } 292 inp->inp_laddr6 = *in6a; 293 } 294 inp->inp_faddr6 = sin6->sin6_addr; 295 inp->inp_fport = sin6->sin6_port; 296 inp->inp_flowinfo &= ~IPV6_FLOWLABEL_MASK; 297 if (ip6_auto_flowlabel) 298 inp->inp_flowinfo |= 299 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 300 in_pcbrehash(inp); 301 return (0); 302} 303 304/* 305 * Get the local address/port, and put it in a sockaddr_in6. 306 * This services the getsockname(2) call. 307 */ 308void 309in6_setsockaddr(struct inpcb *inp, struct mbuf *nam) 310{ 311 struct sockaddr_in6 *sin6; 312 313 nam->m_len = sizeof(struct sockaddr_in6); 314 sin6 = mtod(nam,struct sockaddr_in6 *); 315 316 bzero ((caddr_t)sin6,sizeof(struct sockaddr_in6)); 317 sin6->sin6_family = AF_INET6; 318 sin6->sin6_len = sizeof(struct sockaddr_in6); 319 sin6->sin6_port = inp->inp_lport; 320 sin6->sin6_addr = inp->inp_laddr6; 321 /* KAME hack: recover scopeid */ 322 in6_recoverscope(sin6, &inp->inp_laddr6); 323} 324 325/* 326 * Get the foreign address/port, and put it in a sockaddr_in6. 327 * This services the getpeername(2) call. 328 */ 329void 330in6_setpeeraddr(struct inpcb *inp, struct mbuf *nam) 331{ 332 struct sockaddr_in6 *sin6; 333 334 nam->m_len = sizeof(struct sockaddr_in6); 335 sin6 = mtod(nam,struct sockaddr_in6 *); 336 337 bzero ((caddr_t)sin6,sizeof(struct sockaddr_in6)); 338 sin6->sin6_family = AF_INET6; 339 sin6->sin6_len = sizeof(struct sockaddr_in6); 340 sin6->sin6_port = inp->inp_fport; 341 sin6->sin6_addr = inp->inp_faddr6; 342 /* KAME hack: recover scopeid */ 343 in6_recoverscope(sin6, &inp->inp_faddr6); 344} 345 346/* 347 * Pass some notification to all connections of a protocol 348 * associated with address dst. The local address and/or port numbers 349 * may be specified to limit the search. The "usual action" will be 350 * taken, depending on the ctlinput cmd. The caller must filter any 351 * cmds that are uninteresting (e.g., no error in the map). 352 * Call the protocol specific routine (if any) to report 353 * any errors for each matching socket. 354 * 355 * Also perform input-side security policy check 356 * once PCB to be notified has been located. 357 */ 358int 359in6_pcbnotify(struct inpcbtable *table, struct sockaddr_in6 *dst, 360 uint fport_arg, const struct sockaddr_in6 *src, uint lport_arg, 361 u_int rtable, int cmd, void *cmdarg, void (*notify)(struct inpcb *, int)) 362{ 363 struct inpcb *inp, *ninp; 364 u_short fport = fport_arg, lport = lport_arg; 365 struct sockaddr_in6 sa6_src; 366 int errno, nmatch = 0; 367 u_int32_t flowinfo; 368 u_int rdomain; 369 370 NET_ASSERT_LOCKED(); 371 372 if ((unsigned)cmd >= PRC_NCMDS) 373 return (0); 374 375 if (IN6_IS_ADDR_UNSPECIFIED(&dst->sin6_addr)) 376 return (0); 377 if (IN6_IS_ADDR_V4MAPPED(&dst->sin6_addr)) { 378#ifdef DIAGNOSTIC 379 printf("Huh? Thought in6_pcbnotify() never got " 380 "called with mapped!\n"); 381#endif 382 return (0); 383 } 384 385 /* 386 * note that src can be NULL when we get notify by local fragmentation. 387 */ 388 sa6_src = (src == NULL) ? sa6_any : *src; 389 flowinfo = sa6_src.sin6_flowinfo; 390 391 /* 392 * Redirects go to all references to the destination, 393 * and use in_rtchange to invalidate the route cache. 394 * Dead host indications: also use in_rtchange to invalidate 395 * the cache, and deliver the error to all the sockets. 396 * Otherwise, if we have knowledge of the local port and address, 397 * deliver only to that socket. 398 */ 399 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 400 fport = 0; 401 lport = 0; 402 sa6_src.sin6_addr = in6addr_any; 403 404 if (cmd != PRC_HOSTDEAD) 405 notify = in_rtchange; 406 } 407 errno = inet6ctlerrmap[cmd]; 408 409 rdomain = rtable_l2(rtable); 410 TAILQ_FOREACH_SAFE(inp, &table->inpt_queue, inp_queue, ninp) { 411 if ((inp->inp_flags & INP_IPV6) == 0) 412 continue; 413 414 /* 415 * Under the following condition, notify of redirects 416 * to the pcb, without making address matches against inpcb. 417 * - redirect notification is arrived. 418 * - the inpcb is unconnected. 419 * - the inpcb is caching !RTF_HOST routing entry. 420 * - the ICMPv6 notification is from the gateway cached in the 421 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 422 * the inpcb used very recently. 423 * 424 * This is to improve interaction between netbsd/openbsd 425 * redirect handling code, and inpcb route cache code. 426 * without the clause, !RTF_HOST routing entry (which carries 427 * gateway used by inpcb right before the ICMPv6 redirect) 428 * will be cached forever in unconnected inpcb. 429 * 430 * There still is a question regarding to what is TRT: 431 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 432 * generated on packet output. inpcb will always cache 433 * RTF_HOST routing entry so there's no need for the clause 434 * (ICMPv6 redirect will update RTF_HOST routing entry, 435 * and inpcb is caching it already). 436 * However, bsdi/freebsd are vulnerable to local DoS attacks 437 * due to the cloned routing entries. 438 * - Specwise, "destination cache" is mentioned in RFC2461. 439 * Jinmei says that it implies bsdi/freebsd behavior, itojun 440 * is not really convinced. 441 * - Having hiwat/lowat on # of cloned host route (redirect/ 442 * pmtud) may be a good idea. netbsd/openbsd has it. see 443 * icmp6_mtudisc_update(). 444 */ 445 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 446 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) && 447 inp->inp_route.ro_rt && 448 !(inp->inp_route.ro_rt->rt_flags & RTF_HOST)) { 449 struct sockaddr_in6 *dst6; 450 451 dst6 = satosin6(&inp->inp_route.ro_dst); 452 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 453 &dst->sin6_addr)) 454 goto do_notify; 455 } 456 457 /* 458 * Detect if we should notify the error. If no source and 459 * destination ports are specified, but non-zero flowinfo and 460 * local address match, notify the error. This is the case 461 * when the error is delivered with an encrypted buffer 462 * by ESP. Otherwise, just compare addresses and ports 463 * as usual. 464 */ 465 if (lport == 0 && fport == 0 && flowinfo && 466 inp->inp_socket != NULL && 467 flowinfo == (inp->inp_flowinfo & IPV6_FLOWLABEL_MASK) && 468 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, &sa6_src.sin6_addr)) 469 goto do_notify; 470 else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, 471 &dst->sin6_addr) || 472 rtable_l2(inp->inp_rtableid) != rdomain || 473 inp->inp_socket == NULL || 474 (lport && inp->inp_lport != lport) || 475 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 476 !IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, 477 &sa6_src.sin6_addr)) || 478 (fport && inp->inp_fport != fport)) { 479 continue; 480 } 481 do_notify: 482 nmatch++; 483 if (notify) 484 (*notify)(inp, errno); 485 } 486 return (nmatch); 487} 488 489struct inpcb * 490in6_pcbhashlookup(struct inpcbtable *table, const struct in6_addr *faddr, 491 u_int fport_arg, const struct in6_addr *laddr, u_int lport_arg, 492 u_int rtable) 493{ 494 struct inpcbhead *head; 495 struct inpcb *inp; 496 u_int16_t fport = fport_arg, lport = lport_arg; 497 u_int rdomain; 498 499 rdomain = rtable_l2(rtable); 500 head = in6_pcbhash(table, rdomain, faddr, fport, laddr, lport); 501 LIST_FOREACH(inp, head, inp_hash) { 502 if (!(inp->inp_flags & INP_IPV6)) 503 continue; 504 if (IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, faddr) && 505 inp->inp_fport == fport && inp->inp_lport == lport && 506 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr) && 507 rtable_l2(inp->inp_rtableid) == rdomain) { 508 /* 509 * Move this PCB to the head of hash chain so that 510 * repeated accesses are quicker. This is analogous to 511 * the historic single-entry PCB cache. 512 */ 513 if (inp != LIST_FIRST(head)) { 514 LIST_REMOVE(inp, inp_hash); 515 LIST_INSERT_HEAD(head, inp, inp_hash); 516 } 517 break; 518 } 519 } 520#ifdef DIAGNOSTIC 521 if (inp == NULL && in_pcbnotifymiss) { 522 printf("%s: faddr= fport=%d laddr= lport=%d rdom=%u\n", 523 __func__, ntohs(fport), ntohs(lport), rdomain); 524 } 525#endif 526 return (inp); 527} 528 529struct inpcb * 530in6_pcblookup_listen(struct inpcbtable *table, struct in6_addr *laddr, 531 u_int lport_arg, struct mbuf *m, u_int rtable) 532{ 533 struct inpcbhead *head; 534 const struct in6_addr *key1, *key2; 535 struct inpcb *inp; 536 u_int16_t lport = lport_arg; 537 u_int rdomain; 538 539 key1 = laddr; 540 key2 = &zeroin6_addr; 541#if NPF > 0 542 if (m && m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) { 543 struct pf_divert *divert; 544 545 divert = pf_find_divert(m); 546 KASSERT(divert != NULL); 547 switch (divert->type) { 548 case PF_DIVERT_TO: 549 key1 = key2 = &divert->addr.v6; 550 lport = divert->port; 551 break; 552 case PF_DIVERT_REPLY: 553 return (NULL); 554 default: 555 panic("%s: unknown divert type %d, mbuf %p, divert %p", 556 __func__, divert->type, m, divert); 557 } 558 } else if (m && m->m_pkthdr.pf.flags & PF_TAG_TRANSLATE_LOCALHOST) { 559 /* 560 * Redirected connections should not be treated the same 561 * as connections directed to ::1 since localhost 562 * can only be accessed from the host itself. 563 */ 564 key1 = &zeroin6_addr; 565 key2 = laddr; 566 } 567#endif 568 569 rdomain = rtable_l2(rtable); 570 head = in6_pcbhash(table, rdomain, &zeroin6_addr, 0, key1, lport); 571 LIST_FOREACH(inp, head, inp_hash) { 572 if (!(inp->inp_flags & INP_IPV6)) 573 continue; 574 if (inp->inp_lport == lport && inp->inp_fport == 0 && 575 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, key1) && 576 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6) && 577 rtable_l2(inp->inp_rtableid) == rdomain) 578 break; 579 } 580 if (inp == NULL && ! IN6_ARE_ADDR_EQUAL(key1, key2)) { 581 head = in6_pcbhash(table, rdomain, 582 &zeroin6_addr, 0, key2, lport); 583 LIST_FOREACH(inp, head, inp_hash) { 584 if (!(inp->inp_flags & INP_IPV6)) 585 continue; 586 if (inp->inp_lport == lport && inp->inp_fport == 0 && 587 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, key2) && 588 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6) && 589 rtable_l2(inp->inp_rtableid) == rdomain) 590 break; 591 } 592 } 593 /* 594 * Move this PCB to the head of hash chain so that 595 * repeated accesses are quicker. This is analogous to 596 * the historic single-entry PCB cache. 597 */ 598 if (inp != NULL && inp != LIST_FIRST(head)) { 599 LIST_REMOVE(inp, inp_hash); 600 LIST_INSERT_HEAD(head, inp, inp_hash); 601 } 602#ifdef DIAGNOSTIC 603 if (inp == NULL && in_pcbnotifymiss) { 604 printf("%s: laddr= lport=%d rdom=%u\n", 605 __func__, ntohs(lport), rdomain); 606 } 607#endif 608 return (inp); 609} 610