1 /* $OpenBSD: in6_pcb.c,v 1.38 2003/11/04 22:39:38 markus 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 <sys/param.h> 103 #include <sys/systm.h> 104 #include <sys/malloc.h> 105 #include <sys/mbuf.h> 106 #include <sys/domain.h> 107 #include <sys/protosw.h> 108 #include <sys/socket.h> 109 #include <sys/socketvar.h> 110 #include <sys/errno.h> 111 #include <sys/time.h> 112 #include <sys/proc.h> 113 114 #include <net/if.h> 115 #include <net/route.h> 116 117 #include <netinet/in.h> 118 #include <netinet/in_systm.h> 119 #include <netinet/ip.h> 120 #include <netinet/in_pcb.h> 121 122 #include <netinet6/in6_var.h> 123 #include <netinet/ip6.h> 124 #include <netinet6/ip6_var.h> 125 126 /* 127 * External globals 128 */ 129 130 #include <dev/rndvar.h> 131 132 extern struct in6_ifaddr *in6_ifaddr; 133 extern struct in_ifaddr *in_ifaddr; 134 135 /* 136 * Globals 137 */ 138 139 struct in6_addr zeroin6_addr; 140 141 extern int ipport_firstauto; 142 extern int ipport_lastauto; 143 extern int ipport_hifirstauto; 144 extern int ipport_hilastauto; 145 146 /* 147 * Keep separate inet6ctlerrmap, because I may remap some of these. 148 * I also put it here, because, quite frankly, it belongs here, not in 149 * ip{v6,}_input(). 150 */ 151 #if 0 152 u_char inet6ctlerrmap[PRC_NCMDS] = { 153 0, 0, 0, 0, 154 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 155 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 156 EMSGSIZE, EHOSTUNREACH, 0, 0, 157 0, 0, 0, 0, 158 ENOPROTOOPT 159 }; 160 #endif 161 162 /* 163 * Bind an address (or at least a port) to an PF_INET6 socket. 164 */ 165 int 166 in6_pcbbind(inp, nam) 167 struct inpcb *inp; 168 struct mbuf *nam; 169 { 170 struct socket *so = inp->inp_socket; 171 172 struct inpcbtable *head = inp->inp_table; 173 struct sockaddr_in6 *sin6; 174 struct proc *p = curproc; /* XXX */ 175 u_short lport = 0; 176 int wild = INPLOOKUP_IPV6, reuseport = (so->so_options & SO_REUSEPORT); 177 int error; 178 179 /* 180 * REMINDER: Once up to speed, flow label processing should go here, 181 * too. (Same with in6_pcbconnect.) 182 */ 183 if (in6_ifaddr == 0 || in_ifaddr == 0) 184 return EADDRNOTAVAIL; 185 186 if (inp->inp_lport != 0 || !IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) 187 return EINVAL; /* If already bound, EINVAL! */ 188 189 if ((so->so_options & (SO_REUSEADDR | SO_REUSEPORT)) == 0 && 190 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 191 (so->so_options & SO_ACCEPTCONN) == 0)) 192 wild |= INPLOOKUP_WILDCARD; 193 194 /* 195 * If I did get a sockaddr passed in... 196 */ 197 if (nam) { 198 sin6 = mtod(nam, struct sockaddr_in6 *); 199 if (nam->m_len != sizeof (*sin6)) 200 return EINVAL; 201 202 /* 203 * Unlike v4, I have no qualms about EAFNOSUPPORT if the 204 * wretched family is not filled in! 205 */ 206 if (sin6->sin6_family != AF_INET6) 207 return EAFNOSUPPORT; 208 209 /* KAME hack: embed scopeid */ 210 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 211 return EINVAL; 212 /* this must be cleared for ifa_ifwithaddr() */ 213 sin6->sin6_scope_id = 0; 214 215 lport = sin6->sin6_port; 216 217 /* reject IPv4 mapped address, we have no support for it */ 218 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 219 return EADDRNOTAVAIL; 220 221 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 222 /* 223 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 224 * allow complete duplication of binding if 225 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 226 * and a multicast address is bound on both 227 * new and duplicated sockets. 228 */ 229 if (so->so_options & SO_REUSEADDR) 230 reuseport = SO_REUSEADDR | SO_REUSEPORT; 231 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 232 struct ifaddr *ia = NULL; 233 234 sin6->sin6_port = 0; /* 235 * Yechhhh, because of upcoming 236 * call to ifa_ifwithaddr(), which 237 * does bcmp's over the PORTS as 238 * well. (What about flow?) 239 */ 240 sin6->sin6_flowinfo = 0; 241 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) 242 == NULL) 243 return EADDRNOTAVAIL; 244 245 /* 246 * bind to an anycast address might accidentally 247 * cause sending a packet with an anycast source 248 * address, so we forbid it. 249 * 250 * We should allow to bind to a deprecated address, 251 * since the application dare to use it. 252 * But, can we assume that they are careful enough 253 * to check if the address is deprecated or not? 254 * Maybe, as a safeguard, we should have a setsockopt 255 * flag to control the bind(2) behavior against 256 * deprecated addresses (default: forbid bind(2)). 257 */ 258 if (ia && 259 ((struct in6_ifaddr *)ia)->ia6_flags & 260 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) 261 return (EADDRNOTAVAIL); 262 } 263 if (lport) { 264 struct inpcb *t; 265 266 /* 267 * Question: Do we wish to continue the Berkeley 268 * tradition of ports < IPPORT_RESERVED be only for 269 * root? 270 * Answer: For now yes, but IMHO, it should be REMOVED! 271 * OUCH: One other thing, is there no better way of 272 * finding a process for a socket instead of using 273 * curproc? (Marked with BSD's {in,}famous XXX ? 274 */ 275 if (ntohs(lport) < IPPORT_RESERVED && 276 (error = suser(p, 0))) 277 return error; 278 279 t = in_pcblookup(head, 280 (struct in_addr *)&zeroin6_addr, 0, 281 (struct in_addr *)&sin6->sin6_addr, lport, 282 wild); 283 284 if (t && (reuseport & t->inp_socket->so_options) == 0) 285 return EADDRINUSE; 286 } 287 inp->inp_laddr6 = sin6->sin6_addr; 288 } 289 290 if (lport == 0) { 291 error = in6_pcbsetport(&inp->inp_laddr6, inp, p); 292 if (error != 0) 293 return error; 294 } else { 295 inp->inp_lport = lport; 296 in_pcbrehash(inp); 297 } 298 299 return 0; 300 } 301 302 int 303 in6_pcbsetport(laddr, inp, p) 304 struct in6_addr *laddr; 305 struct inpcb *inp; 306 struct proc *p; 307 { 308 struct socket *so = inp->inp_socket; 309 struct inpcbtable *table = inp->inp_table; 310 u_int16_t first, last, old = 0; 311 u_int16_t *lastport = &inp->inp_table->inpt_lastport; 312 u_int16_t lport = 0; 313 int count; 314 int loopcount = 0; 315 int wild = INPLOOKUP_IPV6; 316 int error; 317 318 /* XXX we no longer support IPv4 mapped address, so no tweaks here */ 319 320 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && 321 ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || 322 (so->so_options & SO_ACCEPTCONN) == 0)) 323 wild |= INPLOOKUP_WILDCARD; 324 325 if (inp->inp_flags & INP_HIGHPORT) { 326 first = ipport_hifirstauto; /* sysctl */ 327 last = ipport_hilastauto; 328 } else if (inp->inp_flags & INP_LOWPORT) { 329 if ((error = suser(p, 0))) 330 return (EACCES); 331 first = IPPORT_RESERVED-1; /* 1023 */ 332 last = 600; /* not IPPORT_RESERVED/2 */ 333 } else { 334 first = ipport_firstauto; /* sysctl */ 335 last = ipport_lastauto; 336 } 337 338 /* 339 * Simple check to ensure all ports are not used up causing 340 * a deadlock here. 341 * 342 * We split the two cases (up and down) so that the direction 343 * is not being tested on each round of the loop. 344 */ 345 346 portloop: 347 if (first > last) { 348 /* 349 * counting down 350 */ 351 if (loopcount == 0) { /* only do this once. */ 352 old = first; 353 first -= (arc4random() % (first - last)); 354 } 355 count = first - last; 356 *lastport = first; /* restart each time */ 357 358 do { 359 if (count-- <= 0) { /* completely used? */ 360 if (loopcount == 0) { 361 last = old; 362 loopcount++; 363 goto portloop; 364 } 365 return (EADDRNOTAVAIL); 366 } 367 --*lastport; 368 if (*lastport > first || *lastport < last) 369 *lastport = first; 370 lport = htons(*lastport); 371 } while (in_baddynamic(*lastport, so->so_proto->pr_protocol) || 372 in_pcblookup(table, &zeroin6_addr, 0, 373 &inp->inp_laddr6, lport, wild)); 374 } else { 375 /* 376 * counting up 377 */ 378 if (loopcount == 0) { /* only do this once. */ 379 old = first; 380 first += (arc4random() % (last - first)); 381 } 382 count = last - first; 383 *lastport = first; /* restart each time */ 384 385 do { 386 if (count-- <= 0) { /* completely used? */ 387 if (loopcount == 0) { 388 first = old; 389 loopcount++; 390 goto portloop; 391 } 392 return (EADDRNOTAVAIL); 393 } 394 ++*lastport; 395 if (*lastport < first || *lastport > last) 396 *lastport = first; 397 lport = htons(*lastport); 398 } while (in_baddynamic(*lastport, so->so_proto->pr_protocol) || 399 in_pcblookup(table, &zeroin6_addr, 0, 400 &inp->inp_laddr6, lport, wild)); 401 } 402 403 inp->inp_lport = lport; 404 in_pcbrehash(inp); 405 406 #if 0 407 inp->inp_flowinfo = 0; /* XXX */ 408 #endif 409 410 return 0; 411 } 412 413 /* 414 * Connect from a socket to a specified address. 415 * Both address and port must be specified in argument sin6. 416 * Eventually, flow labels will have to be dealt with here, as well. 417 * 418 * If don't have a local address for this socket yet, 419 * then pick one. 420 * 421 * I believe this has to be called at splnet(). 422 */ 423 int 424 in6_pcbconnect(inp, nam) 425 struct inpcb *inp; 426 struct mbuf *nam; 427 { 428 struct in6_addr *in6a = NULL; 429 struct sockaddr_in6 *sin6 = mtod(nam, struct sockaddr_in6 *); 430 struct ifnet *ifp = NULL; /* outgoing interface */ 431 int error = 0; 432 struct in6_addr mapped; 433 struct sockaddr_in6 tmp; 434 435 (void)&in6a; /* XXX fool gcc */ 436 437 if (nam->m_len != sizeof(*sin6)) 438 return (EINVAL); 439 if (sin6->sin6_family != AF_INET6) 440 return (EAFNOSUPPORT); 441 if (sin6->sin6_port == 0) 442 return (EADDRNOTAVAIL); 443 444 /* reject IPv4 mapped address, we have no support for it */ 445 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 446 return EADDRNOTAVAIL; 447 448 /* sanity check for mapped address case */ 449 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { 450 if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) 451 inp->inp_laddr6.s6_addr16[5] = htons(0xffff); 452 if (!IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6)) 453 return EINVAL; 454 } else { 455 if (IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6)) 456 return EINVAL; 457 } 458 459 /* protect *sin6 from overwrites */ 460 tmp = *sin6; 461 sin6 = &tmp; 462 463 /* KAME hack: embed scopeid */ 464 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 465 return EINVAL; 466 /* this must be cleared for ifa_ifwithaddr() */ 467 sin6->sin6_scope_id = 0; 468 469 /* Source address selection. */ 470 if (IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6) && 471 inp->inp_laddr6.s6_addr32[3] == 0) { 472 struct sockaddr_in sin, *sinp; 473 474 bzero(&sin, sizeof(sin)); 475 sin.sin_len = sizeof(sin); 476 sin.sin_family = AF_INET; 477 bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, 478 sizeof(sin.sin_addr)); 479 sinp = in_selectsrc(&sin, (struct route *)&inp->inp_route6, 480 inp->inp_socket->so_options, NULL, &error); 481 if (sinp == 0) { 482 if (error == 0) 483 error = EADDRNOTAVAIL; 484 return (error); 485 } 486 bzero(&mapped, sizeof(mapped)); 487 mapped.s6_addr16[5] = htons(0xffff); 488 bcopy(&sinp->sin_addr, &mapped.s6_addr32[3], sizeof(sinp->sin_addr)); 489 in6a = &mapped; 490 } else { 491 /* 492 * XXX: in6_selectsrc might replace the bound local address 493 * with the address specified by setsockopt(IPV6_PKTINFO). 494 * Is it the intended behavior? 495 */ 496 in6a = in6_selectsrc(sin6, inp->inp_outputopts6, 497 inp->inp_moptions6, &inp->inp_route6, &inp->inp_laddr6, 498 &error); 499 if (in6a == 0) { 500 if (error == 0) 501 error = EADDRNOTAVAIL; 502 return (error); 503 } 504 } 505 if (inp->inp_route6.ro_rt) 506 ifp = inp->inp_route6.ro_rt->rt_ifp; 507 508 inp->inp_ipv6.ip6_hlim = (u_int8_t)in6_selecthlim(inp, ifp); 509 510 if (in_pcblookup(inp->inp_table, &sin6->sin6_addr, sin6->sin6_port, 511 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) ? in6a : &inp->inp_laddr6, 512 inp->inp_lport, INPLOOKUP_IPV6)) { 513 return (EADDRINUSE); 514 } 515 if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) || 516 (IN6_IS_ADDR_V4MAPPED(&inp->inp_laddr6) && 517 inp->inp_laddr6.s6_addr32[3] == 0)) { 518 if (inp->inp_lport == 0) 519 (void)in6_pcbbind(inp, (struct mbuf *)0); 520 inp->inp_laddr6 = *in6a; 521 } 522 inp->inp_faddr6 = sin6->sin6_addr; 523 inp->inp_fport = sin6->sin6_port; 524 inp->inp_flowinfo &= ~IPV6_FLOWLABEL_MASK; 525 if (ip6_auto_flowlabel) 526 inp->inp_flowinfo |= 527 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 528 in_pcbrehash(inp); 529 return (0); 530 } 531 532 /* 533 * Pass some notification to all connections of a protocol 534 * associated with address dst. The local address and/or port numbers 535 * may be specified to limit the search. The "usual action" will be 536 * taken, depending on the ctlinput cmd. The caller must filter any 537 * cmds that are uninteresting (e.g., no error in the map). 538 * Call the protocol specific routine (if any) to report 539 * any errors for each matching socket. 540 * 541 * Also perform input-side security policy check 542 * once PCB to be notified has been located. 543 * 544 * Must be called at splnet. 545 */ 546 int 547 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 548 struct inpcbtable *head; 549 struct sockaddr *dst, *src; 550 uint fport_arg; 551 uint lport_arg; 552 int cmd; 553 void *cmdarg; 554 void (*notify)(struct inpcb *, int); 555 { 556 struct inpcb *inp, *ninp; 557 u_short fport = fport_arg, lport = lport_arg; 558 struct sockaddr_in6 sa6_src, *sa6_dst; 559 int errno, nmatch = 0; 560 u_int32_t flowinfo; 561 562 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 563 return 1; 564 565 sa6_dst = (struct sockaddr_in6 *)dst; 566 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 567 return 1; 568 if (IN6_IS_ADDR_V4MAPPED(&sa6_dst->sin6_addr)) 569 printf("Huh? Thought in6_pcbnotify() never got " 570 "called with mapped!\n"); 571 572 /* 573 * note that src can be NULL when we get notify by local fragmentation. 574 */ 575 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 576 flowinfo = sa6_src.sin6_flowinfo; 577 578 /* 579 * Redirects go to all references to the destination, 580 * and use in_rtchange to invalidate the route cache. 581 * Dead host indications: also use in_rtchange to invalidate 582 * the cache, and deliver the error to all the sockets. 583 * Otherwise, if we have knowledge of the local port and address, 584 * deliver only to that socket. 585 */ 586 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 587 fport = 0; 588 lport = 0; 589 sa6_src.sin6_addr = in6addr_any; 590 591 if (cmd != PRC_HOSTDEAD) 592 notify = in_rtchange; 593 } 594 errno = inet6ctlerrmap[cmd]; 595 596 for (inp = head->inpt_queue.cqh_first; 597 inp != (struct inpcb *)&head->inpt_queue; inp = ninp) { 598 ninp = inp->inp_queue.cqe_next; 599 600 if ((inp->inp_flags & INP_IPV6) == 0) 601 continue; 602 603 /* 604 * Under the following condition, notify of redirects 605 * to the pcb, without making address matches against inpcb. 606 * - redirect notification is arrived. 607 * - the inpcb is unconnected. 608 * - the inpcb is caching !RTF_HOST routing entry. 609 * - the ICMPv6 notification is from the gateway cached in the 610 * inpcb. i.e. ICMPv6 notification is from nexthop gateway 611 * the inpcb used very recently. 612 * 613 * This is to improve interaction between netbsd/openbsd 614 * redirect handling code, and inpcb route cache code. 615 * without the clause, !RTF_HOST routing entry (which carries 616 * gateway used by inpcb right before the ICMPv6 redirect) 617 * will be cached forever in unconnected inpcb. 618 * 619 * There still is a question regarding to what is TRT: 620 * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be 621 * generated on packet output. inpcb will always cache 622 * RTF_HOST routing entry so there's no need for the clause 623 * (ICMPv6 redirect will update RTF_HOST routing entry, 624 * and inpcb is caching it already). 625 * However, bsdi/freebsd are vulnerable to local DoS attacks 626 * due to the cloned routing entries. 627 * - Specwise, "destination cache" is mentioned in RFC2461. 628 * Jinmei says that it implies bsdi/freebsd behavior, itojun 629 * is not really convinced. 630 * - Having hiwat/lowat on # of cloned host route (redirect/ 631 * pmtud) may be a good idea. netbsd/openbsd has it. see 632 * icmp6_mtudisc_update(). 633 */ 634 if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && 635 IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6) && 636 inp->inp_route.ro_rt && 637 !(inp->inp_route.ro_rt->rt_flags & RTF_HOST)) { 638 struct sockaddr_in6 *dst6; 639 640 dst6 = (struct sockaddr_in6 *)&inp->inp_route.ro_dst; 641 if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, 642 &sa6_dst->sin6_addr)) 643 goto do_notify; 644 } 645 646 /* 647 * Detect if we should notify the error. If no source and 648 * destination ports are specified, but non-zero flowinfo and 649 * local address match, notify the error. This is the case 650 * when the error is delivered with an encrypted buffer 651 * by ESP. Otherwise, just compare addresses and ports 652 * as usual. 653 */ 654 if (lport == 0 && fport == 0 && flowinfo && 655 inp->inp_socket != NULL && 656 flowinfo == (inp->inp_flowinfo & IPV6_FLOWLABEL_MASK) && 657 IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, &sa6_src.sin6_addr)) 658 goto do_notify; 659 else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, 660 &sa6_dst->sin6_addr) || 661 inp->inp_socket == 0 || 662 (lport && inp->inp_lport != lport) || 663 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 664 !IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, 665 &sa6_src.sin6_addr)) || 666 (fport && inp->inp_fport != fport)) { 667 continue; 668 } 669 do_notify: 670 nmatch++; 671 if (notify) 672 (*notify)(inp, errno); 673 } 674 return 0; 675 } 676 677 /* 678 * Get the local address/port, and put it in a sockaddr_in6. 679 * This services the getsockname(2) call. 680 */ 681 int 682 in6_setsockaddr(inp, nam) 683 struct inpcb *inp; 684 struct mbuf *nam; 685 { 686 struct sockaddr_in6 *sin6; 687 688 nam->m_len = sizeof(struct sockaddr_in6); 689 sin6 = mtod(nam,struct sockaddr_in6 *); 690 691 bzero ((caddr_t)sin6,sizeof(struct sockaddr_in6)); 692 sin6->sin6_family = AF_INET6; 693 sin6->sin6_len = sizeof(struct sockaddr_in6); 694 sin6->sin6_port = inp->inp_lport; 695 sin6->sin6_addr = inp->inp_laddr6; 696 /* KAME hack: recover scopeid */ 697 (void)in6_recoverscope(sin6, &inp->inp_laddr6, NULL); 698 699 return 0; 700 } 701 702 /* 703 * Get the foreign address/port, and put it in a sockaddr_in6. 704 * This services the getpeername(2) call. 705 */ 706 int 707 in6_setpeeraddr(inp, nam) 708 struct inpcb *inp; 709 struct mbuf *nam; 710 { 711 struct sockaddr_in6 *sin6; 712 713 nam->m_len = sizeof(struct sockaddr_in6); 714 sin6 = mtod(nam,struct sockaddr_in6 *); 715 716 bzero ((caddr_t)sin6,sizeof(struct sockaddr_in6)); 717 sin6->sin6_family = AF_INET6; 718 sin6->sin6_len = sizeof(struct sockaddr_in6); 719 sin6->sin6_port = inp->inp_fport; 720 sin6->sin6_addr = inp->inp_faddr6; 721 /* KAME hack: recover scopeid */ 722 (void)in6_recoverscope(sin6, &inp->inp_faddr6, NULL); 723 724 return 0; 725 } 726