1 /* $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $ */ 2 /* $DragonFly: src/sys/netinet6/in6_pcb.c,v 1.10 2003/08/23 11:02:45 rob Exp $ */ 3 /* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 */ 34 35 /* 36 * Copyright (c) 1982, 1986, 1991, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by the University of 50 * California, Berkeley and its contributors. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 68 */ 69 70 #include "opt_inet.h" 71 #include "opt_inet6.h" 72 #include "opt_ipsec.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/sockio.h> 83 #include <sys/errno.h> 84 #include <sys/time.h> 85 #include <sys/proc.h> 86 #include <sys/jail.h> 87 88 #include <vm/vm_zone.h> 89 90 #include <net/if.h> 91 #include <net/if_types.h> 92 #include <net/route.h> 93 94 #include <netinet/in.h> 95 #include <netinet/in_var.h> 96 #include <netinet/in_systm.h> 97 #include <netinet/ip6.h> 98 #include <netinet/ip_var.h> 99 #include <netinet6/ip6_var.h> 100 #include <netinet6/nd6.h> 101 #include <netinet/in_pcb.h> 102 #include <netinet6/in6_pcb.h> 103 104 #ifdef IPSEC 105 #include <netinet6/ipsec.h> 106 #ifdef INET6 107 #include <netinet6/ipsec6.h> 108 #endif 109 #include <netinet6/ah.h> 110 #ifdef INET6 111 #include <netinet6/ah6.h> 112 #endif 113 #include <netproto/key/key.h> 114 #endif /* IPSEC */ 115 116 #ifdef FAST_IPSEC 117 #include "ipsec.h" 118 #include "ipsec6.h" 119 #include <netipsec/key.h> 120 #define IPSEC 121 #endif /* FAST_IPSEC */ 122 123 struct in6_addr zeroin6_addr; 124 125 int 126 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 127 { 128 struct socket *so = inp->inp_socket; 129 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 130 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 131 u_short lport = 0; 132 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 133 134 if (!in6_ifaddr) /* XXX broken! */ 135 return (EADDRNOTAVAIL); 136 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 137 return(EINVAL); 138 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 139 wild = 1; 140 if (nam) { 141 sin6 = (struct sockaddr_in6 *)nam; 142 if (nam->sa_len != sizeof(*sin6)) 143 return(EINVAL); 144 /* 145 * family check. 146 */ 147 if (nam->sa_family != AF_INET6) 148 return(EAFNOSUPPORT); 149 150 /* KAME hack: embed scopeid */ 151 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 152 return EINVAL; 153 /* this must be cleared for ifa_ifwithaddr() */ 154 sin6->sin6_scope_id = 0; 155 156 lport = sin6->sin6_port; 157 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 158 /* 159 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 160 * allow compepte duplication of binding if 161 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 162 * and a multicast address is bound on both 163 * new and duplicated sockets. 164 */ 165 if (so->so_options & SO_REUSEADDR) 166 reuseport = SO_REUSEADDR|SO_REUSEPORT; 167 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 168 struct ifaddr *ia = NULL; 169 170 sin6->sin6_port = 0; /* yech... */ 171 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 172 return(EADDRNOTAVAIL); 173 174 /* 175 * XXX: bind to an anycast address might accidentally 176 * cause sending a packet with anycast source address. 177 * We should allow to bind to a deprecated address, since 178 * the application dare to use it. 179 */ 180 if (ia && 181 ((struct in6_ifaddr *)ia)->ia6_flags & 182 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 183 return(EADDRNOTAVAIL); 184 } 185 } 186 if (lport) { 187 struct inpcb *t; 188 struct proc *p = td->td_proc; /* may be NULL */ 189 190 /* GROSS */ 191 if (ntohs(lport) < IPV6PORT_RESERVED && p && 192 suser_cred(p->p_ucred, PRISON_ROOT)) 193 return(EACCES); 194 if (so->so_cred->cr_uid != 0 && 195 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 196 t = in6_pcblookup_local(pcbinfo, 197 &sin6->sin6_addr, lport, 198 INPLOOKUP_WILDCARD); 199 if (t && 200 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 201 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 202 (t->inp_socket->so_options & 203 SO_REUSEPORT) == 0) && 204 (so->so_cred->cr_uid != 205 t->inp_socket->so_cred->cr_uid)) 206 return (EADDRINUSE); 207 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 208 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 209 struct sockaddr_in sin; 210 211 in6_sin6_2_sin(&sin, sin6); 212 t = in_pcblookup_local(pcbinfo, 213 sin.sin_addr, lport, 214 INPLOOKUP_WILDCARD); 215 if (t && 216 (so->so_cred->cr_uid != 217 t->inp_socket->so_cred->cr_uid) && 218 (ntohl(t->inp_laddr.s_addr) != 219 INADDR_ANY || 220 INP_SOCKAF(so) == 221 INP_SOCKAF(t->inp_socket))) 222 return (EADDRINUSE); 223 } 224 } 225 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 226 lport, wild); 227 if (t && (reuseport & t->inp_socket->so_options) == 0) 228 return(EADDRINUSE); 229 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 230 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 231 struct sockaddr_in sin; 232 233 in6_sin6_2_sin(&sin, sin6); 234 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 235 lport, wild); 236 if (t && 237 (reuseport & t->inp_socket->so_options) 238 == 0 && 239 (ntohl(t->inp_laddr.s_addr) 240 != INADDR_ANY || 241 INP_SOCKAF(so) == 242 INP_SOCKAF(t->inp_socket))) 243 return (EADDRINUSE); 244 } 245 } 246 inp->in6p_laddr = sin6->sin6_addr; 247 } 248 if (lport == 0) { 249 int e; 250 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0) 251 return(e); 252 } 253 else { 254 inp->inp_lport = lport; 255 if (in_pcbinshash(inp) != 0) { 256 inp->in6p_laddr = in6addr_any; 257 inp->inp_lport = 0; 258 return (EAGAIN); 259 } 260 } 261 return(0); 262 } 263 264 /* 265 * Transform old in6_pcbconnect() into an inner subroutine for new 266 * in6_pcbconnect(): Do some validity-checking on the remote 267 * address (in mbuf 'nam') and then determine local host address 268 * (i.e., which interface) to use to access that remote host. 269 * 270 * This preserves definition of in6_pcbconnect(), while supporting a 271 * slightly different version for T/TCP. (This is more than 272 * a bit of a kludge, but cleaning up the internal interfaces would 273 * have forced minor changes in every protocol). 274 */ 275 276 int 277 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam, 278 struct in6_addr **plocal_addr6) 279 { 280 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 281 struct ifnet *ifp = NULL; 282 int error = 0; 283 284 if (nam->sa_len != sizeof (*sin6)) 285 return (EINVAL); 286 if (sin6->sin6_family != AF_INET6) 287 return (EAFNOSUPPORT); 288 if (sin6->sin6_port == 0) 289 return (EADDRNOTAVAIL); 290 291 /* KAME hack: embed scopeid */ 292 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 293 return EINVAL; 294 295 if (in6_ifaddr) { 296 /* 297 * If the destination address is UNSPECIFIED addr, 298 * use the loopback addr, e.g ::1. 299 */ 300 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 301 sin6->sin6_addr = in6addr_loopback; 302 } 303 { 304 /* 305 * XXX: in6_selectsrc might replace the bound local address 306 * with the address specified by setsockopt(IPV6_PKTINFO). 307 * Is it the intended behavior? 308 */ 309 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 310 inp->in6p_moptions, 311 &inp->in6p_route, 312 &inp->in6p_laddr, &error); 313 if (*plocal_addr6 == 0) { 314 if (error == 0) 315 error = EADDRNOTAVAIL; 316 return(error); 317 } 318 /* 319 * Don't do pcblookup call here; return interface in 320 * plocal_addr6 321 * and exit to caller, that will do the lookup. 322 */ 323 } 324 325 if (inp->in6p_route.ro_rt) 326 ifp = inp->in6p_route.ro_rt->rt_ifp; 327 328 return(0); 329 } 330 331 /* 332 * Outer subroutine: 333 * Connect from a socket to a specified address. 334 * Both address and port must be specified in argument sin. 335 * If don't have a local address for this socket yet, 336 * then pick one. 337 */ 338 int 339 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 340 { 341 struct in6_addr *addr6; 342 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 343 int error; 344 345 /* 346 * Call inner routine, to assign local interface address. 347 * in6_pcbladdr() may automatically fill in sin6_scope_id. 348 */ 349 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 350 return(error); 351 352 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 353 sin6->sin6_port, 354 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 355 ? addr6 : &inp->in6p_laddr, 356 inp->inp_lport, 0, NULL) != NULL) { 357 return (EADDRINUSE); 358 } 359 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 360 if (inp->inp_lport == 0) { 361 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 362 if (error) 363 return (error); 364 } 365 inp->in6p_laddr = *addr6; 366 } 367 inp->in6p_faddr = sin6->sin6_addr; 368 inp->inp_fport = sin6->sin6_port; 369 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 370 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 371 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 372 inp->in6p_flowinfo |= 373 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 374 375 in_pcbrehash(inp); 376 return (0); 377 } 378 379 #if 0 380 /* 381 * Return an IPv6 address, which is the most appropriate for given 382 * destination and user specified options. 383 * If necessary, this function lookups the routing table and return 384 * an entry to the caller for later use. 385 */ 386 struct in6_addr * 387 in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp) 388 struct sockaddr_in6 *dstsock; 389 struct ip6_pktopts *opts; 390 struct ip6_moptions *mopts; 391 struct route_in6 *ro; 392 struct in6_addr *laddr; 393 int *errorp; 394 { 395 struct in6_addr *dst; 396 struct in6_ifaddr *ia6 = 0; 397 struct in6_pktinfo *pi = NULL; 398 399 dst = &dstsock->sin6_addr; 400 *errorp = 0; 401 402 /* 403 * If the source address is explicitly specified by the caller, 404 * use it. 405 */ 406 if (opts && (pi = opts->ip6po_pktinfo) && 407 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) 408 return(&pi->ipi6_addr); 409 410 /* 411 * If the source address is not specified but the socket(if any) 412 * is already bound, use the bound address. 413 */ 414 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) 415 return(laddr); 416 417 /* 418 * If the caller doesn't specify the source address but 419 * the outgoing interface, use an address associated with 420 * the interface. 421 */ 422 if (pi && pi->ipi6_ifindex) { 423 /* XXX boundary check is assumed to be already done. */ 424 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex], 425 dst); 426 if (ia6 == 0) { 427 *errorp = EADDRNOTAVAIL; 428 return(0); 429 } 430 return(&satosin6(&ia6->ia_addr)->sin6_addr); 431 } 432 433 /* 434 * If the destination address is a link-local unicast address or 435 * a multicast address, and if the outgoing interface is specified 436 * by the sin6_scope_id filed, use an address associated with the 437 * interface. 438 * XXX: We're now trying to define more specific semantics of 439 * sin6_scope_id field, so this part will be rewritten in 440 * the near future. 441 */ 442 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && 443 dstsock->sin6_scope_id) { 444 /* 445 * I'm not sure if boundary check for scope_id is done 446 * somewhere... 447 */ 448 if (dstsock->sin6_scope_id < 0 || 449 if_index < dstsock->sin6_scope_id) { 450 *errorp = ENXIO; /* XXX: better error? */ 451 return(0); 452 } 453 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id], 454 dst); 455 if (ia6 == 0) { 456 *errorp = EADDRNOTAVAIL; 457 return(0); 458 } 459 return(&satosin6(&ia6->ia_addr)->sin6_addr); 460 } 461 462 /* 463 * If the destination address is a multicast address and 464 * the outgoing interface for the address is specified 465 * by the caller, use an address associated with the interface. 466 * There is a sanity check here; if the destination has node-local 467 * scope, the outgoing interfacde should be a loopback address. 468 * Even if the outgoing interface is not specified, we also 469 * choose a loopback interface as the outgoing interface. 470 */ 471 if (IN6_IS_ADDR_MULTICAST(dst)) { 472 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; 473 474 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { 475 ifp = &loif[0]; 476 } 477 478 if (ifp) { 479 ia6 = in6_ifawithscope(ifp, dst); 480 if (ia6 == 0) { 481 *errorp = EADDRNOTAVAIL; 482 return(0); 483 } 484 return(&ia6->ia_addr.sin6_addr); 485 } 486 } 487 488 /* 489 * If the next hop address for the packet is specified 490 * by caller, use an address associated with the route 491 * to the next hop. 492 */ 493 { 494 struct sockaddr_in6 *sin6_next; 495 struct rtentry *rt; 496 497 if (opts && opts->ip6po_nexthop) { 498 sin6_next = satosin6(opts->ip6po_nexthop); 499 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); 500 if (rt) { 501 ia6 = in6_ifawithscope(rt->rt_ifp, dst); 502 if (ia6 == 0) 503 ia6 = ifatoia6(rt->rt_ifa); 504 } 505 if (ia6 == 0) { 506 *errorp = EADDRNOTAVAIL; 507 return(0); 508 } 509 return(&satosin6(&ia6->ia_addr)->sin6_addr); 510 } 511 } 512 513 /* 514 * If route is known or can be allocated now, 515 * our src addr is taken from the i/f, else punt. 516 */ 517 if (ro) { 518 if (ro->ro_rt && 519 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { 520 RTFREE(ro->ro_rt); 521 ro->ro_rt = (struct rtentry *)0; 522 } 523 if (ro->ro_rt == (struct rtentry *)0 || 524 ro->ro_rt->rt_ifp == (struct ifnet *)0) { 525 struct sockaddr_in6 *dst6; 526 527 /* No route yet, so try to acquire one */ 528 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); 529 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 530 dst6->sin6_family = AF_INET6; 531 dst6->sin6_len = sizeof(struct sockaddr_in6); 532 dst6->sin6_addr = *dst; 533 if (IN6_IS_ADDR_MULTICAST(dst)) { 534 ro->ro_rt = rtalloc1(&((struct route *)ro) 535 ->ro_dst, 0, 0UL); 536 } else { 537 rtalloc((struct route *)ro); 538 } 539 } 540 541 /* 542 * in_pcbconnect() checks out IFF_LOOPBACK to skip using 543 * the address. But we don't know why it does so. 544 * It is necessary to ensure the scope even for lo0 545 * so doesn't check out IFF_LOOPBACK. 546 */ 547 548 if (ro->ro_rt) { 549 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); 550 if (ia6 == 0) /* xxx scope error ?*/ 551 ia6 = ifatoia6(ro->ro_rt->rt_ifa); 552 } 553 if (ia6 == 0) { 554 *errorp = EHOSTUNREACH; /* no route */ 555 return(0); 556 } 557 return(&satosin6(&ia6->ia_addr)->sin6_addr); 558 } 559 560 *errorp = EADDRNOTAVAIL; 561 return(0); 562 } 563 564 /* 565 * Default hop limit selection. The precedence is as follows: 566 * 1. Hoplimit valued specified via ioctl. 567 * 2. (If the outgoing interface is detected) the current 568 * hop limit of the interface specified by router advertisement. 569 * 3. The system default hoplimit. 570 */ 571 int 572 in6_selecthlim(in6p, ifp) 573 struct in6pcb *in6p; 574 struct ifnet *ifp; 575 { 576 if (in6p && in6p->in6p_hops >= 0) 577 return(in6p->in6p_hops); 578 else if (ifp) 579 return(nd_ifinfo[ifp->if_index].chlim); 580 else 581 return(ip6_defhlim); 582 } 583 #endif 584 585 void 586 in6_pcbdisconnect(inp) 587 struct inpcb *inp; 588 { 589 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 590 inp->inp_fport = 0; 591 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 592 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 593 in_pcbrehash(inp); 594 if (inp->inp_socket->so_state & SS_NOFDREF) 595 in6_pcbdetach(inp); 596 } 597 598 void 599 in6_pcbdetach(inp) 600 struct inpcb *inp; 601 { 602 struct socket *so = inp->inp_socket; 603 struct inpcbinfo *ipi = inp->inp_pcbinfo; 604 605 #ifdef IPSEC 606 if (inp->in6p_sp != NULL) 607 ipsec6_delete_pcbpolicy(inp); 608 #endif /* IPSEC */ 609 inp->inp_gencnt = ++ipi->ipi_gencnt; 610 in_pcbremlists(inp); 611 sotoinpcb(so) = 0; 612 sofree(so); 613 614 if (inp->in6p_options) 615 m_freem(inp->in6p_options); 616 ip6_freepcbopts(inp->in6p_outputopts); 617 ip6_freemoptions(inp->in6p_moptions); 618 if (inp->in6p_route.ro_rt) 619 rtfree(inp->in6p_route.ro_rt); 620 /* Check and free IPv4 related resources in case of mapped addr */ 621 if (inp->inp_options) 622 (void)m_free(inp->inp_options); 623 ip_freemoptions(inp->inp_moptions); 624 625 inp->inp_vflag = 0; 626 zfree(ipi->ipi_zone, inp); 627 } 628 629 /* 630 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 631 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 632 * in struct pr_usrreqs, so that protocols can just reference then directly 633 * without the need for a wrapper function. The socket must have a valid 634 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 635 * except through a kernel programming error, so it is acceptable to panic 636 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 637 * because there actually /is/ a programming error somewhere... XXX) 638 */ 639 int 640 in6_setsockaddr(so, nam) 641 struct socket *so; 642 struct sockaddr **nam; 643 { 644 int s; 645 struct inpcb *inp; 646 struct sockaddr_in6 *sin6; 647 648 /* 649 * Do the malloc first in case it blocks. 650 */ 651 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 652 bzero(sin6, sizeof *sin6); 653 sin6->sin6_family = AF_INET6; 654 sin6->sin6_len = sizeof(*sin6); 655 656 s = splnet(); 657 inp = sotoinpcb(so); 658 if (!inp) { 659 splx(s); 660 free(sin6, M_SONAME); 661 return EINVAL; 662 } 663 sin6->sin6_port = inp->inp_lport; 664 sin6->sin6_addr = inp->in6p_laddr; 665 splx(s); 666 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 667 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 668 else 669 sin6->sin6_scope_id = 0; /*XXX*/ 670 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 671 sin6->sin6_addr.s6_addr16[1] = 0; 672 673 *nam = (struct sockaddr *)sin6; 674 return 0; 675 } 676 677 int 678 in6_setpeeraddr(so, nam) 679 struct socket *so; 680 struct sockaddr **nam; 681 { 682 int s; 683 struct inpcb *inp; 684 struct sockaddr_in6 *sin6; 685 686 /* 687 * Do the malloc first in case it blocks. 688 */ 689 MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK); 690 bzero((caddr_t)sin6, sizeof (*sin6)); 691 sin6->sin6_family = AF_INET6; 692 sin6->sin6_len = sizeof(struct sockaddr_in6); 693 694 s = splnet(); 695 inp = sotoinpcb(so); 696 if (!inp) { 697 splx(s); 698 free(sin6, M_SONAME); 699 return EINVAL; 700 } 701 sin6->sin6_port = inp->inp_fport; 702 sin6->sin6_addr = inp->in6p_faddr; 703 splx(s); 704 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 705 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 706 else 707 sin6->sin6_scope_id = 0; /*XXX*/ 708 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 709 sin6->sin6_addr.s6_addr16[1] = 0; 710 711 *nam = (struct sockaddr *)sin6; 712 return 0; 713 } 714 715 int 716 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 717 { 718 struct inpcb *inp = sotoinpcb(so); 719 int error; 720 721 if (inp == NULL) 722 return EINVAL; 723 if (inp->inp_vflag & INP_IPV4) { 724 error = in_setsockaddr(so, nam); 725 if (error == 0) 726 in6_sin_2_v4mapsin6_in_sock(nam); 727 } else 728 /* scope issues will be handled in in6_setsockaddr(). */ 729 error = in6_setsockaddr(so, nam); 730 731 return error; 732 } 733 734 int 735 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 736 { 737 struct inpcb *inp = sotoinpcb(so); 738 int error; 739 740 if (inp == NULL) 741 return EINVAL; 742 if (inp->inp_vflag & INP_IPV4) { 743 error = in_setpeeraddr(so, nam); 744 if (error == 0) 745 in6_sin_2_v4mapsin6_in_sock(nam); 746 } else 747 /* scope issues will be handled in in6_setpeeraddr(). */ 748 error = in6_setpeeraddr(so, nam); 749 750 return error; 751 } 752 753 /* 754 * Pass some notification to all connections of a protocol 755 * associated with address dst. The local address and/or port numbers 756 * may be specified to limit the search. The "usual action" will be 757 * taken, depending on the ctlinput cmd. The caller must filter any 758 * cmds that are uninteresting (e.g., no error in the map). 759 * Call the protocol specific routine (if any) to report 760 * any errors for each matching socket. 761 * 762 * Must be called at splnet. 763 */ 764 void 765 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify) 766 struct inpcbhead *head; 767 struct sockaddr *dst; 768 u_int fport_arg; 769 const struct sockaddr *src; 770 u_int lport_arg; 771 int cmd; 772 void (*notify) (struct inpcb *, int); 773 { 774 struct inpcb *inp, *ninp; 775 struct sockaddr_in6 sa6_src, *sa6_dst; 776 u_short fport = fport_arg, lport = lport_arg; 777 u_int32_t flowinfo; 778 int errno, s; 779 780 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 781 return; 782 783 sa6_dst = (struct sockaddr_in6 *)dst; 784 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 785 return; 786 787 /* 788 * note that src can be NULL when we get notify by local fragmentation. 789 */ 790 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 791 flowinfo = sa6_src.sin6_flowinfo; 792 793 /* 794 * Redirects go to all references to the destination, 795 * and use in6_rtchange to invalidate the route cache. 796 * Dead host indications: also use in6_rtchange to invalidate 797 * the cache, and deliver the error to all the sockets. 798 * Otherwise, if we have knowledge of the local port and address, 799 * deliver only to that socket. 800 */ 801 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 802 fport = 0; 803 lport = 0; 804 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 805 806 if (cmd != PRC_HOSTDEAD) 807 notify = in6_rtchange; 808 } 809 errno = inet6ctlerrmap[cmd]; 810 s = splnet(); 811 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 812 ninp = LIST_NEXT(inp, inp_list); 813 814 if ((inp->inp_vflag & INP_IPV6) == 0) 815 continue; 816 817 /* 818 * Detect if we should notify the error. If no source and 819 * destination ports are specifed, but non-zero flowinfo and 820 * local address match, notify the error. This is the case 821 * when the error is delivered with an encrypted buffer 822 * by ESP. Otherwise, just compare addresses and ports 823 * as usual. 824 */ 825 if (lport == 0 && fport == 0 && flowinfo && 826 inp->inp_socket != NULL && 827 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 828 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 829 goto do_notify; 830 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 831 &sa6_dst->sin6_addr) || 832 inp->inp_socket == 0 || 833 (lport && inp->inp_lport != lport) || 834 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 835 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 836 &sa6_src.sin6_addr)) || 837 (fport && inp->inp_fport != fport)) 838 continue; 839 840 do_notify: 841 if (notify) 842 (*notify)(inp, errno); 843 } 844 splx(s); 845 } 846 847 /* 848 * Lookup a PCB based on the local address and port. 849 */ 850 struct inpcb * 851 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 852 struct inpcbinfo *pcbinfo; 853 struct in6_addr *laddr; 854 u_int lport_arg; 855 int wild_okay; 856 { 857 struct inpcb *inp; 858 int matchwild = 3, wildcard; 859 u_short lport = lport_arg; 860 861 if (!wild_okay) { 862 struct inpcbhead *head; 863 /* 864 * Look for an unconnected (wildcard foreign addr) PCB that 865 * matches the local address and port we're looking for. 866 */ 867 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 868 pcbinfo->hashmask)]; 869 LIST_FOREACH(inp, head, inp_hash) { 870 if ((inp->inp_vflag & INP_IPV6) == 0) 871 continue; 872 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 873 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 874 inp->inp_lport == lport) { 875 /* 876 * Found. 877 */ 878 return (inp); 879 } 880 } 881 /* 882 * Not found. 883 */ 884 return (NULL); 885 } else { 886 struct inpcbporthead *porthash; 887 struct inpcbport *phd; 888 struct inpcb *match = NULL; 889 /* 890 * Best fit PCB lookup. 891 * 892 * First see if this local port is in use by looking on the 893 * port hash list. 894 */ 895 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 896 pcbinfo->porthashmask)]; 897 LIST_FOREACH(phd, porthash, phd_hash) { 898 if (phd->phd_port == lport) 899 break; 900 } 901 if (phd != NULL) { 902 /* 903 * Port is in use by one or more PCBs. Look for best 904 * fit. 905 */ 906 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 907 wildcard = 0; 908 if ((inp->inp_vflag & INP_IPV6) == 0) 909 continue; 910 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 911 wildcard++; 912 if (!IN6_IS_ADDR_UNSPECIFIED( 913 &inp->in6p_laddr)) { 914 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 915 wildcard++; 916 else if (!IN6_ARE_ADDR_EQUAL( 917 &inp->in6p_laddr, laddr)) 918 continue; 919 } else { 920 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 921 wildcard++; 922 } 923 if (wildcard < matchwild) { 924 match = inp; 925 matchwild = wildcard; 926 if (matchwild == 0) { 927 break; 928 } 929 } 930 } 931 } 932 return (match); 933 } 934 } 935 936 void 937 in6_pcbpurgeif0(head, ifp) 938 struct in6pcb *head; 939 struct ifnet *ifp; 940 { 941 struct in6pcb *in6p; 942 struct ip6_moptions *im6o; 943 struct in6_multi_mship *imm, *nimm; 944 945 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 946 im6o = in6p->in6p_moptions; 947 if ((in6p->inp_vflag & INP_IPV6) && 948 im6o) { 949 /* 950 * Unselect the outgoing interface if it is being 951 * detached. 952 */ 953 if (im6o->im6o_multicast_ifp == ifp) 954 im6o->im6o_multicast_ifp = NULL; 955 956 /* 957 * Drop multicast group membership if we joined 958 * through the interface being detached. 959 * XXX controversial - is it really legal for kernel 960 * to force this? 961 */ 962 for (imm = im6o->im6o_memberships.lh_first; 963 imm != NULL; imm = nimm) { 964 nimm = imm->i6mm_chain.le_next; 965 if (imm->i6mm_maddr->in6m_ifp == ifp) { 966 LIST_REMOVE(imm, i6mm_chain); 967 in6_delmulti(imm->i6mm_maddr); 968 free(imm, M_IPMADDR); 969 } 970 } 971 } 972 } 973 } 974 975 /* 976 * Check for alternatives when higher level complains 977 * about service problems. For now, invalidate cached 978 * routing information. If the route was created dynamically 979 * (by a redirect), time to try a default gateway again. 980 */ 981 void 982 in6_losing(in6p) 983 struct inpcb *in6p; 984 { 985 struct rtentry *rt; 986 struct rt_addrinfo info; 987 988 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 989 bzero((caddr_t)&info, sizeof(info)); 990 info.rti_flags = rt->rt_flags; 991 info.rti_info[RTAX_DST] = rt_key(rt); 992 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 993 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 994 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 995 if (rt->rt_flags & RTF_DYNAMIC) 996 (void)rtrequest1(RTM_DELETE, &info, NULL); 997 in6p->in6p_route.ro_rt = NULL; 998 rtfree(rt); 999 /* 1000 * A new route can be allocated 1001 * the next time output is attempted. 1002 */ 1003 } 1004 } 1005 1006 /* 1007 * After a routing change, flush old routing 1008 * and allocate a (hopefully) better one. 1009 */ 1010 void 1011 in6_rtchange(inp, errno) 1012 struct inpcb *inp; 1013 int errno; 1014 { 1015 if (inp->in6p_route.ro_rt) { 1016 rtfree(inp->in6p_route.ro_rt); 1017 inp->in6p_route.ro_rt = 0; 1018 /* 1019 * A new route can be allocated the next time 1020 * output is attempted. 1021 */ 1022 } 1023 } 1024 1025 /* 1026 * Lookup PCB in hash list. 1027 */ 1028 struct inpcb * 1029 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 1030 struct inpcbinfo *pcbinfo; 1031 struct in6_addr *faddr, *laddr; 1032 u_int fport_arg, lport_arg; 1033 int wildcard; 1034 struct ifnet *ifp; 1035 { 1036 struct inpcbhead *head; 1037 struct inpcb *inp; 1038 u_short fport = fport_arg, lport = lport_arg; 1039 int faith; 1040 1041 if (faithprefix_p != NULL) 1042 faith = (*faithprefix_p)(laddr); 1043 else 1044 faith = 0; 1045 1046 /* 1047 * First look for an exact match. 1048 */ 1049 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 1050 lport, fport, 1051 pcbinfo->hashmask)]; 1052 LIST_FOREACH(inp, head, inp_hash) { 1053 if ((inp->inp_vflag & INP_IPV6) == 0) 1054 continue; 1055 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 1056 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 1057 inp->inp_fport == fport && 1058 inp->inp_lport == lport) { 1059 /* 1060 * Found. 1061 */ 1062 return (inp); 1063 } 1064 } 1065 if (wildcard) { 1066 struct inpcb *local_wild = NULL; 1067 1068 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 1069 pcbinfo->hashmask)]; 1070 LIST_FOREACH(inp, head, inp_hash) { 1071 if ((inp->inp_vflag & INP_IPV6) == 0) 1072 continue; 1073 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1074 inp->inp_lport == lport) { 1075 if (faith && (inp->inp_flags & INP_FAITH) == 0) 1076 continue; 1077 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 1078 laddr)) 1079 return (inp); 1080 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1081 local_wild = inp; 1082 } 1083 } 1084 return (local_wild); 1085 } 1086 1087 /* 1088 * Not found. 1089 */ 1090 return (NULL); 1091 } 1092 1093 void 1094 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 1095 { 1096 struct ip6_hdr *ip; 1097 1098 ip = mtod(m, struct ip6_hdr *); 1099 bzero(sin6, sizeof(*sin6)); 1100 sin6->sin6_len = sizeof(*sin6); 1101 sin6->sin6_family = AF_INET6; 1102 sin6->sin6_addr = ip->ip6_src; 1103 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1104 sin6->sin6_addr.s6_addr16[1] = 0; 1105 sin6->sin6_scope_id = 1106 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1107 ? m->m_pkthdr.rcvif->if_index : 0; 1108 1109 return; 1110 } 1111