1 /* $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $ */ 2 /* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1991, 1993 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University 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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 67 */ 68 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 73 #include <sys/param.h> 74 #include <sys/systm.h> 75 #include <sys/malloc.h> 76 #include <sys/mbuf.h> 77 #include <sys/domain.h> 78 #include <sys/protosw.h> 79 #include <sys/socket.h> 80 #include <sys/socketvar.h> 81 #include <sys/sockio.h> 82 #include <sys/errno.h> 83 #include <sys/time.h> 84 #include <sys/proc.h> 85 #include <sys/jail.h> 86 87 #include <vm/vm_zone.h> 88 89 #include <net/if.h> 90 #include <net/if_types.h> 91 #include <net/route.h> 92 93 #include <netinet/in.h> 94 #include <netinet/in_var.h> 95 #include <netinet/in_systm.h> 96 #include <netinet/ip6.h> 97 #include <netinet/ip_var.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/nd6.h> 100 #include <netinet/in_pcb.h> 101 #include <netinet6/in6_pcb.h> 102 103 #ifdef IPSEC 104 #include <netinet6/ipsec.h> 105 #ifdef INET6 106 #include <netinet6/ipsec6.h> 107 #endif 108 #include <netinet6/ah.h> 109 #ifdef INET6 110 #include <netinet6/ah6.h> 111 #endif 112 #include <netkey/key.h> 113 #endif /* IPSEC */ 114 115 #ifdef FAST_IPSEC 116 #include <netipsec/ipsec.h> 117 #include <netipsec/ipsec6.h> 118 #include <netipsec/key.h> 119 #define IPSEC 120 #endif /* FAST_IPSEC */ 121 122 struct in6_addr zeroin6_addr; 123 124 int 125 in6_pcbbind(inp, nam, p) 126 register struct inpcb *inp; 127 struct sockaddr *nam; 128 struct proc *p; 129 { 130 struct socket *so = inp->inp_socket; 131 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 132 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 133 u_short lport = 0; 134 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 135 136 if (!in6_ifaddr) /* XXX broken! */ 137 return (EADDRNOTAVAIL); 138 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 139 return(EINVAL); 140 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 141 wild = 1; 142 if (nam) { 143 sin6 = (struct sockaddr_in6 *)nam; 144 if (nam->sa_len != sizeof(*sin6)) 145 return(EINVAL); 146 /* 147 * family check. 148 */ 149 if (nam->sa_family != AF_INET6) 150 return(EAFNOSUPPORT); 151 152 /* KAME hack: embed scopeid */ 153 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 154 return EINVAL; 155 /* this must be cleared for ifa_ifwithaddr() */ 156 sin6->sin6_scope_id = 0; 157 158 lport = sin6->sin6_port; 159 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 160 /* 161 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 162 * allow compepte duplication of binding if 163 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 164 * and a multicast address is bound on both 165 * new and duplicated sockets. 166 */ 167 if (so->so_options & SO_REUSEADDR) 168 reuseport = SO_REUSEADDR|SO_REUSEPORT; 169 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 170 struct ifaddr *ia = NULL; 171 172 sin6->sin6_port = 0; /* yech... */ 173 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 174 return(EADDRNOTAVAIL); 175 176 /* 177 * XXX: bind to an anycast address might accidentally 178 * cause sending a packet with anycast source address. 179 * We should allow to bind to a deprecated address, since 180 * the application dare to use it. 181 */ 182 if (ia && 183 ((struct in6_ifaddr *)ia)->ia6_flags & 184 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 185 return(EADDRNOTAVAIL); 186 } 187 } 188 if (lport) { 189 struct inpcb *t; 190 191 /* GROSS */ 192 if (ntohs(lport) < IPV6PORT_RESERVED && p && 193 suser_xxx(0, p, PRISON_ROOT)) 194 return(EACCES); 195 if (so->so_cred->cr_uid != 0 && 196 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 197 t = in6_pcblookup_local(pcbinfo, 198 &sin6->sin6_addr, lport, 199 INPLOOKUP_WILDCARD); 200 if (t && 201 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 202 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 203 (t->inp_socket->so_options & 204 SO_REUSEPORT) == 0) && 205 (so->so_cred->cr_uid != 206 t->inp_socket->so_cred->cr_uid)) 207 return (EADDRINUSE); 208 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 209 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 210 struct sockaddr_in sin; 211 212 in6_sin6_2_sin(&sin, sin6); 213 t = in_pcblookup_local(pcbinfo, 214 sin.sin_addr, lport, 215 INPLOOKUP_WILDCARD); 216 if (t && 217 (so->so_cred->cr_uid != 218 t->inp_socket->so_cred->cr_uid) && 219 (ntohl(t->inp_laddr.s_addr) != 220 INADDR_ANY || 221 INP_SOCKAF(so) == 222 INP_SOCKAF(t->inp_socket))) 223 return (EADDRINUSE); 224 } 225 } 226 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 227 lport, wild); 228 if (t && (reuseport & t->inp_socket->so_options) == 0) 229 return(EADDRINUSE); 230 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 231 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 232 struct sockaddr_in sin; 233 234 in6_sin6_2_sin(&sin, sin6); 235 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 236 lport, wild); 237 if (t && 238 (reuseport & t->inp_socket->so_options) 239 == 0 && 240 (ntohl(t->inp_laddr.s_addr) 241 != INADDR_ANY || 242 INP_SOCKAF(so) == 243 INP_SOCKAF(t->inp_socket))) 244 return (EADDRINUSE); 245 } 246 } 247 inp->in6p_laddr = sin6->sin6_addr; 248 } 249 if (lport == 0) { 250 int e; 251 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, p)) != 0) 252 return(e); 253 } 254 else { 255 inp->inp_lport = lport; 256 if (in_pcbinshash(inp) != 0) { 257 inp->in6p_laddr = in6addr_any; 258 inp->inp_lport = 0; 259 return (EAGAIN); 260 } 261 } 262 return(0); 263 } 264 265 /* 266 * Transform old in6_pcbconnect() into an inner subroutine for new 267 * in6_pcbconnect(): Do some validity-checking on the remote 268 * address (in mbuf 'nam') and then determine local host address 269 * (i.e., which interface) to use to access that remote host. 270 * 271 * This preserves definition of in6_pcbconnect(), while supporting a 272 * slightly different version for T/TCP. (This is more than 273 * a bit of a kludge, but cleaning up the internal interfaces would 274 * have forced minor changes in every protocol). 275 */ 276 277 int 278 in6_pcbladdr(inp, nam, plocal_addr6) 279 register struct inpcb *inp; 280 struct sockaddr *nam; 281 struct in6_addr **plocal_addr6; 282 { 283 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 284 struct ifnet *ifp = NULL; 285 int error = 0; 286 287 if (nam->sa_len != sizeof (*sin6)) 288 return (EINVAL); 289 if (sin6->sin6_family != AF_INET6) 290 return (EAFNOSUPPORT); 291 if (sin6->sin6_port == 0) 292 return (EADDRNOTAVAIL); 293 294 /* KAME hack: embed scopeid */ 295 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 296 return EINVAL; 297 298 if (in6_ifaddr) { 299 /* 300 * If the destination address is UNSPECIFIED addr, 301 * use the loopback addr, e.g ::1. 302 */ 303 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 304 sin6->sin6_addr = in6addr_loopback; 305 } 306 { 307 /* 308 * XXX: in6_selectsrc might replace the bound local address 309 * with the address specified by setsockopt(IPV6_PKTINFO). 310 * Is it the intended behavior? 311 */ 312 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 313 inp->in6p_moptions, 314 &inp->in6p_route, 315 &inp->in6p_laddr, &error); 316 if (*plocal_addr6 == 0) { 317 if (error == 0) 318 error = EADDRNOTAVAIL; 319 return(error); 320 } 321 /* 322 * Don't do pcblookup call here; return interface in 323 * plocal_addr6 324 * and exit to caller, that will do the lookup. 325 */ 326 } 327 328 if (inp->in6p_route.ro_rt) 329 ifp = inp->in6p_route.ro_rt->rt_ifp; 330 331 return(0); 332 } 333 334 /* 335 * Outer subroutine: 336 * Connect from a socket to a specified address. 337 * Both address and port must be specified in argument sin. 338 * If don't have a local address for this socket yet, 339 * then pick one. 340 */ 341 int 342 in6_pcbconnect(inp, nam, p) 343 register struct inpcb *inp; 344 struct sockaddr *nam; 345 struct proc *p; 346 { 347 struct in6_addr *addr6; 348 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 349 int error; 350 351 /* 352 * Call inner routine, to assign local interface address. 353 * in6_pcbladdr() may automatically fill in sin6_scope_id. 354 */ 355 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 356 return(error); 357 358 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 359 sin6->sin6_port, 360 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 361 ? addr6 : &inp->in6p_laddr, 362 inp->inp_lport, 0, NULL) != NULL) { 363 return (EADDRINUSE); 364 } 365 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 366 if (inp->inp_lport == 0) { 367 error = in6_pcbbind(inp, (struct sockaddr *)0, p); 368 if (error) 369 return (error); 370 } 371 inp->in6p_laddr = *addr6; 372 } 373 inp->in6p_faddr = sin6->sin6_addr; 374 inp->inp_fport = sin6->sin6_port; 375 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 376 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 377 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 378 inp->in6p_flowinfo |= 379 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 380 381 in_pcbrehash(inp); 382 return (0); 383 } 384 385 #if 0 386 /* 387 * Return an IPv6 address, which is the most appropriate for given 388 * destination and user specified options. 389 * If necessary, this function lookups the routing table and return 390 * an entry to the caller for later use. 391 */ 392 struct in6_addr * 393 in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp) 394 struct sockaddr_in6 *dstsock; 395 struct ip6_pktopts *opts; 396 struct ip6_moptions *mopts; 397 struct route_in6 *ro; 398 struct in6_addr *laddr; 399 int *errorp; 400 { 401 struct in6_addr *dst; 402 struct in6_ifaddr *ia6 = 0; 403 struct in6_pktinfo *pi = NULL; 404 405 dst = &dstsock->sin6_addr; 406 *errorp = 0; 407 408 /* 409 * If the source address is explicitly specified by the caller, 410 * use it. 411 */ 412 if (opts && (pi = opts->ip6po_pktinfo) && 413 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) 414 return(&pi->ipi6_addr); 415 416 /* 417 * If the source address is not specified but the socket(if any) 418 * is already bound, use the bound address. 419 */ 420 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) 421 return(laddr); 422 423 /* 424 * If the caller doesn't specify the source address but 425 * the outgoing interface, use an address associated with 426 * the interface. 427 */ 428 if (pi && pi->ipi6_ifindex) { 429 /* XXX boundary check is assumed to be already done. */ 430 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex], 431 dst); 432 if (ia6 == 0) { 433 *errorp = EADDRNOTAVAIL; 434 return(0); 435 } 436 return(&satosin6(&ia6->ia_addr)->sin6_addr); 437 } 438 439 /* 440 * If the destination address is a link-local unicast address or 441 * a multicast address, and if the outgoing interface is specified 442 * by the sin6_scope_id filed, use an address associated with the 443 * interface. 444 * XXX: We're now trying to define more specific semantics of 445 * sin6_scope_id field, so this part will be rewritten in 446 * the near future. 447 */ 448 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && 449 dstsock->sin6_scope_id) { 450 /* 451 * I'm not sure if boundary check for scope_id is done 452 * somewhere... 453 */ 454 if (dstsock->sin6_scope_id < 0 || 455 if_index < dstsock->sin6_scope_id) { 456 *errorp = ENXIO; /* XXX: better error? */ 457 return(0); 458 } 459 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id], 460 dst); 461 if (ia6 == 0) { 462 *errorp = EADDRNOTAVAIL; 463 return(0); 464 } 465 return(&satosin6(&ia6->ia_addr)->sin6_addr); 466 } 467 468 /* 469 * If the destination address is a multicast address and 470 * the outgoing interface for the address is specified 471 * by the caller, use an address associated with the interface. 472 * There is a sanity check here; if the destination has node-local 473 * scope, the outgoing interfacde should be a loopback address. 474 * Even if the outgoing interface is not specified, we also 475 * choose a loopback interface as the outgoing interface. 476 */ 477 if (IN6_IS_ADDR_MULTICAST(dst)) { 478 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; 479 480 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { 481 ifp = &loif[0]; 482 } 483 484 if (ifp) { 485 ia6 = in6_ifawithscope(ifp, dst); 486 if (ia6 == 0) { 487 *errorp = EADDRNOTAVAIL; 488 return(0); 489 } 490 return(&ia6->ia_addr.sin6_addr); 491 } 492 } 493 494 /* 495 * If the next hop address for the packet is specified 496 * by caller, use an address associated with the route 497 * to the next hop. 498 */ 499 { 500 struct sockaddr_in6 *sin6_next; 501 struct rtentry *rt; 502 503 if (opts && opts->ip6po_nexthop) { 504 sin6_next = satosin6(opts->ip6po_nexthop); 505 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); 506 if (rt) { 507 ia6 = in6_ifawithscope(rt->rt_ifp, dst); 508 if (ia6 == 0) 509 ia6 = ifatoia6(rt->rt_ifa); 510 } 511 if (ia6 == 0) { 512 *errorp = EADDRNOTAVAIL; 513 return(0); 514 } 515 return(&satosin6(&ia6->ia_addr)->sin6_addr); 516 } 517 } 518 519 /* 520 * If route is known or can be allocated now, 521 * our src addr is taken from the i/f, else punt. 522 */ 523 if (ro) { 524 if (ro->ro_rt && 525 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { 526 RTFREE(ro->ro_rt); 527 ro->ro_rt = (struct rtentry *)0; 528 } 529 if (ro->ro_rt == (struct rtentry *)0 || 530 ro->ro_rt->rt_ifp == (struct ifnet *)0) { 531 struct sockaddr_in6 *dst6; 532 533 /* No route yet, so try to acquire one */ 534 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); 535 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 536 dst6->sin6_family = AF_INET6; 537 dst6->sin6_len = sizeof(struct sockaddr_in6); 538 dst6->sin6_addr = *dst; 539 if (IN6_IS_ADDR_MULTICAST(dst)) { 540 ro->ro_rt = rtalloc1(&((struct route *)ro) 541 ->ro_dst, 0, 0UL); 542 } else { 543 rtalloc((struct route *)ro); 544 } 545 } 546 547 /* 548 * in_pcbconnect() checks out IFF_LOOPBACK to skip using 549 * the address. But we don't know why it does so. 550 * It is necessary to ensure the scope even for lo0 551 * so doesn't check out IFF_LOOPBACK. 552 */ 553 554 if (ro->ro_rt) { 555 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); 556 if (ia6 == 0) /* xxx scope error ?*/ 557 ia6 = ifatoia6(ro->ro_rt->rt_ifa); 558 } 559 if (ia6 == 0) { 560 *errorp = EHOSTUNREACH; /* no route */ 561 return(0); 562 } 563 return(&satosin6(&ia6->ia_addr)->sin6_addr); 564 } 565 566 *errorp = EADDRNOTAVAIL; 567 return(0); 568 } 569 570 /* 571 * Default hop limit selection. The precedence is as follows: 572 * 1. Hoplimit valued specified via ioctl. 573 * 2. (If the outgoing interface is detected) the current 574 * hop limit of the interface specified by router advertisement. 575 * 3. The system default hoplimit. 576 */ 577 int 578 in6_selecthlim(in6p, ifp) 579 struct in6pcb *in6p; 580 struct ifnet *ifp; 581 { 582 if (in6p && in6p->in6p_hops >= 0) 583 return(in6p->in6p_hops); 584 else if (ifp) 585 return(nd_ifinfo[ifp->if_index].chlim); 586 else 587 return(ip6_defhlim); 588 } 589 #endif 590 591 void 592 in6_pcbdisconnect(inp) 593 struct inpcb *inp; 594 { 595 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 596 inp->inp_fport = 0; 597 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 598 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 599 in_pcbrehash(inp); 600 if (inp->inp_socket->so_state & SS_NOFDREF) 601 in6_pcbdetach(inp); 602 } 603 604 void 605 in6_pcbdetach(inp) 606 struct inpcb *inp; 607 { 608 struct socket *so = inp->inp_socket; 609 struct inpcbinfo *ipi = inp->inp_pcbinfo; 610 611 #ifdef IPSEC 612 if (inp->in6p_sp != NULL) 613 ipsec6_delete_pcbpolicy(inp); 614 #endif /* IPSEC */ 615 inp->inp_gencnt = ++ipi->ipi_gencnt; 616 in_pcbremlists(inp); 617 sotoinpcb(so) = 0; 618 sofree(so); 619 620 if (inp->in6p_options) 621 m_freem(inp->in6p_options); 622 ip6_freepcbopts(inp->in6p_outputopts); 623 ip6_freemoptions(inp->in6p_moptions); 624 if (inp->in6p_route.ro_rt) 625 rtfree(inp->in6p_route.ro_rt); 626 /* Check and free IPv4 related resources in case of mapped addr */ 627 if (inp->inp_options) 628 (void)m_free(inp->inp_options); 629 ip_freemoptions(inp->inp_moptions); 630 631 inp->inp_vflag = 0; 632 zfreei(ipi->ipi_zone, inp); 633 } 634 635 /* 636 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 637 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 638 * in struct pr_usrreqs, so that protocols can just reference then directly 639 * without the need for a wrapper function. The socket must have a valid 640 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 641 * except through a kernel programming error, so it is acceptable to panic 642 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 643 * because there actually /is/ a programming error somewhere... XXX) 644 */ 645 int 646 in6_setsockaddr(so, nam) 647 struct socket *so; 648 struct sockaddr **nam; 649 { 650 int s; 651 register struct inpcb *inp; 652 register struct sockaddr_in6 *sin6; 653 654 /* 655 * Do the malloc first in case it blocks. 656 */ 657 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 658 bzero(sin6, sizeof *sin6); 659 sin6->sin6_family = AF_INET6; 660 sin6->sin6_len = sizeof(*sin6); 661 662 s = splnet(); 663 inp = sotoinpcb(so); 664 if (!inp) { 665 splx(s); 666 free(sin6, M_SONAME); 667 return EINVAL; 668 } 669 sin6->sin6_port = inp->inp_lport; 670 sin6->sin6_addr = inp->in6p_laddr; 671 splx(s); 672 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 673 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 674 else 675 sin6->sin6_scope_id = 0; /*XXX*/ 676 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 677 sin6->sin6_addr.s6_addr16[1] = 0; 678 679 *nam = (struct sockaddr *)sin6; 680 return 0; 681 } 682 683 int 684 in6_setpeeraddr(so, nam) 685 struct socket *so; 686 struct sockaddr **nam; 687 { 688 int s; 689 struct inpcb *inp; 690 register struct sockaddr_in6 *sin6; 691 692 /* 693 * Do the malloc first in case it blocks. 694 */ 695 MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK); 696 bzero((caddr_t)sin6, sizeof (*sin6)); 697 sin6->sin6_family = AF_INET6; 698 sin6->sin6_len = sizeof(struct sockaddr_in6); 699 700 s = splnet(); 701 inp = sotoinpcb(so); 702 if (!inp) { 703 splx(s); 704 free(sin6, M_SONAME); 705 return EINVAL; 706 } 707 sin6->sin6_port = inp->inp_fport; 708 sin6->sin6_addr = inp->in6p_faddr; 709 splx(s); 710 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 711 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 712 else 713 sin6->sin6_scope_id = 0; /*XXX*/ 714 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 715 sin6->sin6_addr.s6_addr16[1] = 0; 716 717 *nam = (struct sockaddr *)sin6; 718 return 0; 719 } 720 721 int 722 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 723 { 724 struct inpcb *inp = sotoinpcb(so); 725 int error; 726 727 if (inp == NULL) 728 return EINVAL; 729 if (inp->inp_vflag & INP_IPV4) { 730 error = in_setsockaddr(so, nam); 731 if (error == 0) 732 in6_sin_2_v4mapsin6_in_sock(nam); 733 } else 734 /* scope issues will be handled in in6_setsockaddr(). */ 735 error = in6_setsockaddr(so, nam); 736 737 return error; 738 } 739 740 int 741 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 742 { 743 struct inpcb *inp = sotoinpcb(so); 744 int error; 745 746 if (inp == NULL) 747 return EINVAL; 748 if (inp->inp_vflag & INP_IPV4) { 749 error = in_setpeeraddr(so, nam); 750 if (error == 0) 751 in6_sin_2_v4mapsin6_in_sock(nam); 752 } else 753 /* scope issues will be handled in in6_setpeeraddr(). */ 754 error = in6_setpeeraddr(so, nam); 755 756 return error; 757 } 758 759 /* 760 * Pass some notification to all connections of a protocol 761 * associated with address dst. The local address and/or port numbers 762 * may be specified to limit the search. The "usual action" will be 763 * taken, depending on the ctlinput cmd. The caller must filter any 764 * cmds that are uninteresting (e.g., no error in the map). 765 * Call the protocol specific routine (if any) to report 766 * any errors for each matching socket. 767 * 768 * Must be called at splnet. 769 */ 770 void 771 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify) 772 struct inpcbhead *head; 773 struct sockaddr *dst, *src; 774 u_int fport_arg, lport_arg; 775 int cmd; 776 void (*notify) __P((struct inpcb *, int)); 777 { 778 struct inpcb *inp, *ninp; 779 struct sockaddr_in6 sa6_src, *sa6_dst; 780 u_short fport = fport_arg, lport = lport_arg; 781 u_int32_t flowinfo; 782 int errno, s; 783 784 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 785 return; 786 787 sa6_dst = (struct sockaddr_in6 *)dst; 788 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 789 return; 790 791 /* 792 * note that src can be NULL when we get notify by local fragmentation. 793 */ 794 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 795 flowinfo = sa6_src.sin6_flowinfo; 796 797 /* 798 * Redirects go to all references to the destination, 799 * and use in6_rtchange to invalidate the route cache. 800 * Dead host indications: also use in6_rtchange to invalidate 801 * the cache, and deliver the error to all the sockets. 802 * Otherwise, if we have knowledge of the local port and address, 803 * deliver only to that socket. 804 */ 805 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 806 fport = 0; 807 lport = 0; 808 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 809 810 if (cmd != PRC_HOSTDEAD) 811 notify = in6_rtchange; 812 } 813 errno = inet6ctlerrmap[cmd]; 814 s = splnet(); 815 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 816 ninp = LIST_NEXT(inp, inp_list); 817 818 if ((inp->inp_vflag & INP_IPV6) == 0) 819 continue; 820 821 /* 822 * Detect if we should notify the error. If no source and 823 * destination ports are specifed, but non-zero flowinfo and 824 * local address match, notify the error. This is the case 825 * when the error is delivered with an encrypted buffer 826 * by ESP. Otherwise, just compare addresses and ports 827 * as usual. 828 */ 829 if (lport == 0 && fport == 0 && flowinfo && 830 inp->inp_socket != NULL && 831 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 832 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 833 goto do_notify; 834 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 835 &sa6_dst->sin6_addr) || 836 inp->inp_socket == 0 || 837 (lport && inp->inp_lport != lport) || 838 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 839 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 840 &sa6_src.sin6_addr)) || 841 (fport && inp->inp_fport != fport)) 842 continue; 843 844 do_notify: 845 if (notify) 846 (*notify)(inp, errno); 847 } 848 splx(s); 849 } 850 851 /* 852 * Lookup a PCB based on the local address and port. 853 */ 854 struct inpcb * 855 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 856 struct inpcbinfo *pcbinfo; 857 struct in6_addr *laddr; 858 u_int lport_arg; 859 int wild_okay; 860 { 861 register struct inpcb *inp; 862 int matchwild = 3, wildcard; 863 u_short lport = lport_arg; 864 865 if (!wild_okay) { 866 struct inpcbhead *head; 867 /* 868 * Look for an unconnected (wildcard foreign addr) PCB that 869 * matches the local address and port we're looking for. 870 */ 871 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 872 pcbinfo->hashmask)]; 873 LIST_FOREACH(inp, head, inp_hash) { 874 if ((inp->inp_vflag & INP_IPV6) == 0) 875 continue; 876 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 877 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 878 inp->inp_lport == lport) { 879 /* 880 * Found. 881 */ 882 return (inp); 883 } 884 } 885 /* 886 * Not found. 887 */ 888 return (NULL); 889 } else { 890 struct inpcbporthead *porthash; 891 struct inpcbport *phd; 892 struct inpcb *match = NULL; 893 /* 894 * Best fit PCB lookup. 895 * 896 * First see if this local port is in use by looking on the 897 * port hash list. 898 */ 899 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 900 pcbinfo->porthashmask)]; 901 LIST_FOREACH(phd, porthash, phd_hash) { 902 if (phd->phd_port == lport) 903 break; 904 } 905 if (phd != NULL) { 906 /* 907 * Port is in use by one or more PCBs. Look for best 908 * fit. 909 */ 910 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 911 wildcard = 0; 912 if ((inp->inp_vflag & INP_IPV6) == 0) 913 continue; 914 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 915 wildcard++; 916 if (!IN6_IS_ADDR_UNSPECIFIED( 917 &inp->in6p_laddr)) { 918 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 919 wildcard++; 920 else if (!IN6_ARE_ADDR_EQUAL( 921 &inp->in6p_laddr, laddr)) 922 continue; 923 } else { 924 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 925 wildcard++; 926 } 927 if (wildcard < matchwild) { 928 match = inp; 929 matchwild = wildcard; 930 if (matchwild == 0) { 931 break; 932 } 933 } 934 } 935 } 936 return (match); 937 } 938 } 939 940 void 941 in6_pcbpurgeif0(head, ifp) 942 struct in6pcb *head; 943 struct ifnet *ifp; 944 { 945 struct in6pcb *in6p; 946 struct ip6_moptions *im6o; 947 struct in6_multi_mship *imm, *nimm; 948 949 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 950 im6o = in6p->in6p_moptions; 951 if ((in6p->inp_vflag & INP_IPV6) && 952 im6o) { 953 /* 954 * Unselect the outgoing interface if it is being 955 * detached. 956 */ 957 if (im6o->im6o_multicast_ifp == ifp) 958 im6o->im6o_multicast_ifp = NULL; 959 960 /* 961 * Drop multicast group membership if we joined 962 * through the interface being detached. 963 * XXX controversial - is it really legal for kernel 964 * to force this? 965 */ 966 for (imm = im6o->im6o_memberships.lh_first; 967 imm != NULL; imm = nimm) { 968 nimm = imm->i6mm_chain.le_next; 969 if (imm->i6mm_maddr->in6m_ifp == ifp) { 970 LIST_REMOVE(imm, i6mm_chain); 971 in6_delmulti(imm->i6mm_maddr); 972 free(imm, M_IPMADDR); 973 } 974 } 975 } 976 } 977 } 978 979 /* 980 * Check for alternatives when higher level complains 981 * about service problems. For now, invalidate cached 982 * routing information. If the route was created dynamically 983 * (by a redirect), time to try a default gateway again. 984 */ 985 void 986 in6_losing(in6p) 987 struct inpcb *in6p; 988 { 989 struct rtentry *rt; 990 struct rt_addrinfo info; 991 992 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 993 bzero((caddr_t)&info, sizeof(info)); 994 info.rti_flags = rt->rt_flags; 995 info.rti_info[RTAX_DST] = rt_key(rt); 996 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 997 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 998 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 999 if (rt->rt_flags & RTF_DYNAMIC) 1000 (void)rtrequest1(RTM_DELETE, &info, NULL); 1001 in6p->in6p_route.ro_rt = NULL; 1002 rtfree(rt); 1003 /* 1004 * A new route can be allocated 1005 * the next time output is attempted. 1006 */ 1007 } 1008 } 1009 1010 /* 1011 * After a routing change, flush old routing 1012 * and allocate a (hopefully) better one. 1013 */ 1014 void 1015 in6_rtchange(inp, errno) 1016 struct inpcb *inp; 1017 int errno; 1018 { 1019 if (inp->in6p_route.ro_rt) { 1020 rtfree(inp->in6p_route.ro_rt); 1021 inp->in6p_route.ro_rt = 0; 1022 /* 1023 * A new route can be allocated the next time 1024 * output is attempted. 1025 */ 1026 } 1027 } 1028 1029 /* 1030 * Lookup PCB in hash list. 1031 */ 1032 struct inpcb * 1033 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 1034 struct inpcbinfo *pcbinfo; 1035 struct in6_addr *faddr, *laddr; 1036 u_int fport_arg, lport_arg; 1037 int wildcard; 1038 struct ifnet *ifp; 1039 { 1040 struct inpcbhead *head; 1041 register struct inpcb *inp; 1042 u_short fport = fport_arg, lport = lport_arg; 1043 int faith; 1044 1045 if (faithprefix_p != NULL) 1046 faith = (*faithprefix_p)(laddr); 1047 else 1048 faith = 0; 1049 1050 /* 1051 * First look for an exact match. 1052 */ 1053 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 1054 lport, fport, 1055 pcbinfo->hashmask)]; 1056 LIST_FOREACH(inp, head, inp_hash) { 1057 if ((inp->inp_vflag & INP_IPV6) == 0) 1058 continue; 1059 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 1060 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 1061 inp->inp_fport == fport && 1062 inp->inp_lport == lport) { 1063 /* 1064 * Found. 1065 */ 1066 return (inp); 1067 } 1068 } 1069 if (wildcard) { 1070 struct inpcb *local_wild = NULL; 1071 1072 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 1073 pcbinfo->hashmask)]; 1074 LIST_FOREACH(inp, head, inp_hash) { 1075 if ((inp->inp_vflag & INP_IPV6) == 0) 1076 continue; 1077 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1078 inp->inp_lport == lport) { 1079 if (faith && (inp->inp_flags & INP_FAITH) == 0) 1080 continue; 1081 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 1082 laddr)) 1083 return (inp); 1084 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1085 local_wild = inp; 1086 } 1087 } 1088 return (local_wild); 1089 } 1090 1091 /* 1092 * Not found. 1093 */ 1094 return (NULL); 1095 } 1096 1097 void 1098 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 1099 { 1100 struct ip6_hdr *ip; 1101 1102 ip = mtod(m, struct ip6_hdr *); 1103 bzero(sin6, sizeof(*sin6)); 1104 sin6->sin6_len = sizeof(*sin6); 1105 sin6->sin6_family = AF_INET6; 1106 sin6->sin6_addr = ip->ip6_src; 1107 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1108 sin6->sin6_addr.s6_addr16[1] = 0; 1109 sin6->sin6_scope_id = 1110 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1111 ? m->m_pkthdr.rcvif->if_index : 0; 1112 1113 return; 1114 } 1115