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 1.11 2004/03/04 01:02:06 hsu 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_pcbinsporthash(inp) != 0) { 256 inp->in6p_laddr = in6addr_any; 257 inp->inp_lport = 0; 258 return (EAGAIN); 259 } 260 } 261 in_pcbinsbindhash(inp); 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(struct inpcb *inp, struct sockaddr *nam, 279 struct in6_addr **plocal_addr6) 280 { 281 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 282 struct ifnet *ifp = NULL; 283 int error = 0; 284 285 if (nam->sa_len != sizeof (*sin6)) 286 return (EINVAL); 287 if (sin6->sin6_family != AF_INET6) 288 return (EAFNOSUPPORT); 289 if (sin6->sin6_port == 0) 290 return (EADDRNOTAVAIL); 291 292 /* KAME hack: embed scopeid */ 293 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 294 return EINVAL; 295 296 if (in6_ifaddr) { 297 /* 298 * If the destination address is UNSPECIFIED addr, 299 * use the loopback addr, e.g ::1. 300 */ 301 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 302 sin6->sin6_addr = in6addr_loopback; 303 } 304 { 305 /* 306 * XXX: in6_selectsrc might replace the bound local address 307 * with the address specified by setsockopt(IPV6_PKTINFO). 308 * Is it the intended behavior? 309 */ 310 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 311 inp->in6p_moptions, 312 &inp->in6p_route, 313 &inp->in6p_laddr, &error); 314 if (*plocal_addr6 == 0) { 315 if (error == 0) 316 error = EADDRNOTAVAIL; 317 return(error); 318 } 319 /* 320 * Don't do pcblookup call here; return interface in 321 * plocal_addr6 322 * and exit to caller, that will do the lookup. 323 */ 324 } 325 326 if (inp->in6p_route.ro_rt) 327 ifp = inp->in6p_route.ro_rt->rt_ifp; 328 329 return(0); 330 } 331 332 /* 333 * Outer subroutine: 334 * Connect from a socket to a specified address. 335 * Both address and port must be specified in argument sin. 336 * If don't have a local address for this socket yet, 337 * then pick one. 338 */ 339 int 340 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 341 { 342 struct in6_addr *addr6; 343 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 344 int error; 345 346 /* 347 * Call inner routine, to assign local interface address. 348 * in6_pcbladdr() may automatically fill in sin6_scope_id. 349 */ 350 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 351 return(error); 352 353 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 354 sin6->sin6_port, 355 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 356 ? addr6 : &inp->in6p_laddr, 357 inp->inp_lport, 0, NULL) != NULL) { 358 return (EADDRINUSE); 359 } 360 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 361 if (inp->inp_lport == 0) { 362 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 363 if (error) 364 return (error); 365 } 366 inp->in6p_laddr = *addr6; 367 } 368 inp->in6p_faddr = sin6->sin6_addr; 369 inp->inp_fport = sin6->sin6_port; 370 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 371 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 372 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 373 inp->in6p_flowinfo |= 374 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 375 376 in_pcbrehash(inp, INP_CONNECTED); 377 return (0); 378 } 379 380 #if 0 381 /* 382 * Return an IPv6 address, which is the most appropriate for given 383 * destination and user specified options. 384 * If necessary, this function lookups the routing table and return 385 * an entry to the caller for later use. 386 */ 387 struct in6_addr * 388 in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp) 389 struct sockaddr_in6 *dstsock; 390 struct ip6_pktopts *opts; 391 struct ip6_moptions *mopts; 392 struct route_in6 *ro; 393 struct in6_addr *laddr; 394 int *errorp; 395 { 396 struct in6_addr *dst; 397 struct in6_ifaddr *ia6 = 0; 398 struct in6_pktinfo *pi = NULL; 399 400 dst = &dstsock->sin6_addr; 401 *errorp = 0; 402 403 /* 404 * If the source address is explicitly specified by the caller, 405 * use it. 406 */ 407 if (opts && (pi = opts->ip6po_pktinfo) && 408 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) 409 return(&pi->ipi6_addr); 410 411 /* 412 * If the source address is not specified but the socket(if any) 413 * is already bound, use the bound address. 414 */ 415 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) 416 return(laddr); 417 418 /* 419 * If the caller doesn't specify the source address but 420 * the outgoing interface, use an address associated with 421 * the interface. 422 */ 423 if (pi && pi->ipi6_ifindex) { 424 /* XXX boundary check is assumed to be already done. */ 425 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex], 426 dst); 427 if (ia6 == 0) { 428 *errorp = EADDRNOTAVAIL; 429 return(0); 430 } 431 return(&satosin6(&ia6->ia_addr)->sin6_addr); 432 } 433 434 /* 435 * If the destination address is a link-local unicast address or 436 * a multicast address, and if the outgoing interface is specified 437 * by the sin6_scope_id filed, use an address associated with the 438 * interface. 439 * XXX: We're now trying to define more specific semantics of 440 * sin6_scope_id field, so this part will be rewritten in 441 * the near future. 442 */ 443 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && 444 dstsock->sin6_scope_id) { 445 /* 446 * I'm not sure if boundary check for scope_id is done 447 * somewhere... 448 */ 449 if (dstsock->sin6_scope_id < 0 || 450 if_index < dstsock->sin6_scope_id) { 451 *errorp = ENXIO; /* XXX: better error? */ 452 return(0); 453 } 454 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id], 455 dst); 456 if (ia6 == 0) { 457 *errorp = EADDRNOTAVAIL; 458 return(0); 459 } 460 return(&satosin6(&ia6->ia_addr)->sin6_addr); 461 } 462 463 /* 464 * If the destination address is a multicast address and 465 * the outgoing interface for the address is specified 466 * by the caller, use an address associated with the interface. 467 * There is a sanity check here; if the destination has node-local 468 * scope, the outgoing interfacde should be a loopback address. 469 * Even if the outgoing interface is not specified, we also 470 * choose a loopback interface as the outgoing interface. 471 */ 472 if (IN6_IS_ADDR_MULTICAST(dst)) { 473 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; 474 475 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { 476 ifp = &loif[0]; 477 } 478 479 if (ifp) { 480 ia6 = in6_ifawithscope(ifp, dst); 481 if (ia6 == 0) { 482 *errorp = EADDRNOTAVAIL; 483 return(0); 484 } 485 return(&ia6->ia_addr.sin6_addr); 486 } 487 } 488 489 /* 490 * If the next hop address for the packet is specified 491 * by caller, use an address associated with the route 492 * to the next hop. 493 */ 494 { 495 struct sockaddr_in6 *sin6_next; 496 struct rtentry *rt; 497 498 if (opts && opts->ip6po_nexthop) { 499 sin6_next = satosin6(opts->ip6po_nexthop); 500 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); 501 if (rt) { 502 ia6 = in6_ifawithscope(rt->rt_ifp, dst); 503 if (ia6 == 0) 504 ia6 = ifatoia6(rt->rt_ifa); 505 } 506 if (ia6 == 0) { 507 *errorp = EADDRNOTAVAIL; 508 return(0); 509 } 510 return(&satosin6(&ia6->ia_addr)->sin6_addr); 511 } 512 } 513 514 /* 515 * If route is known or can be allocated now, 516 * our src addr is taken from the i/f, else punt. 517 */ 518 if (ro) { 519 if (ro->ro_rt && 520 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { 521 RTFREE(ro->ro_rt); 522 ro->ro_rt = (struct rtentry *)0; 523 } 524 if (ro->ro_rt == (struct rtentry *)0 || 525 ro->ro_rt->rt_ifp == (struct ifnet *)0) { 526 struct sockaddr_in6 *dst6; 527 528 /* No route yet, so try to acquire one */ 529 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); 530 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 531 dst6->sin6_family = AF_INET6; 532 dst6->sin6_len = sizeof(struct sockaddr_in6); 533 dst6->sin6_addr = *dst; 534 if (IN6_IS_ADDR_MULTICAST(dst)) { 535 ro->ro_rt = rtalloc1(&((struct route *)ro) 536 ->ro_dst, 0, 0UL); 537 } else { 538 rtalloc((struct route *)ro); 539 } 540 } 541 542 /* 543 * in_pcbconnect() checks out IFF_LOOPBACK to skip using 544 * the address. But we don't know why it does so. 545 * It is necessary to ensure the scope even for lo0 546 * so doesn't check out IFF_LOOPBACK. 547 */ 548 549 if (ro->ro_rt) { 550 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); 551 if (ia6 == 0) /* xxx scope error ?*/ 552 ia6 = ifatoia6(ro->ro_rt->rt_ifa); 553 } 554 if (ia6 == 0) { 555 *errorp = EHOSTUNREACH; /* no route */ 556 return(0); 557 } 558 return(&satosin6(&ia6->ia_addr)->sin6_addr); 559 } 560 561 *errorp = EADDRNOTAVAIL; 562 return(0); 563 } 564 565 /* 566 * Default hop limit selection. The precedence is as follows: 567 * 1. Hoplimit valued specified via ioctl. 568 * 2. (If the outgoing interface is detected) the current 569 * hop limit of the interface specified by router advertisement. 570 * 3. The system default hoplimit. 571 */ 572 int 573 in6_selecthlim(in6p, ifp) 574 struct in6pcb *in6p; 575 struct ifnet *ifp; 576 { 577 if (in6p && in6p->in6p_hops >= 0) 578 return(in6p->in6p_hops); 579 else if (ifp) 580 return(nd_ifinfo[ifp->if_index].chlim); 581 else 582 return(ip6_defhlim); 583 } 584 #endif 585 586 void 587 in6_pcbdisconnect(inp) 588 struct inpcb *inp; 589 { 590 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 591 inp->inp_fport = 0; 592 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 593 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 594 in_pcbremconnhash(inp); 595 if (inp->inp_socket->so_state & SS_NOFDREF) 596 in6_pcbdetach(inp); 597 } 598 599 void 600 in6_pcbdetach(inp) 601 struct inpcb *inp; 602 { 603 struct socket *so = inp->inp_socket; 604 struct inpcbinfo *ipi = inp->inp_pcbinfo; 605 606 #ifdef IPSEC 607 if (inp->in6p_sp != NULL) 608 ipsec6_delete_pcbpolicy(inp); 609 #endif /* IPSEC */ 610 inp->inp_gencnt = ++ipi->ipi_gencnt; 611 in_pcbremlists(inp); 612 sotoinpcb(so) = 0; 613 sofree(so); 614 615 if (inp->in6p_options) 616 m_freem(inp->in6p_options); 617 ip6_freepcbopts(inp->in6p_outputopts); 618 ip6_freemoptions(inp->in6p_moptions); 619 if (inp->in6p_route.ro_rt) 620 rtfree(inp->in6p_route.ro_rt); 621 /* Check and free IPv4 related resources in case of mapped addr */ 622 if (inp->inp_options) 623 (void)m_free(inp->inp_options); 624 ip_freemoptions(inp->inp_moptions); 625 626 inp->inp_vflag = 0; 627 zfree(ipi->ipi_zone, inp); 628 } 629 630 /* 631 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 632 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 633 * in struct pr_usrreqs, so that protocols can just reference then directly 634 * without the need for a wrapper function. The socket must have a valid 635 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 636 * except through a kernel programming error, so it is acceptable to panic 637 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 638 * because there actually /is/ a programming error somewhere... XXX) 639 */ 640 int 641 in6_setsockaddr(so, nam) 642 struct socket *so; 643 struct sockaddr **nam; 644 { 645 int s; 646 struct inpcb *inp; 647 struct sockaddr_in6 *sin6; 648 649 /* 650 * Do the malloc first in case it blocks. 651 */ 652 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 653 bzero(sin6, sizeof *sin6); 654 sin6->sin6_family = AF_INET6; 655 sin6->sin6_len = sizeof(*sin6); 656 657 s = splnet(); 658 inp = sotoinpcb(so); 659 if (!inp) { 660 splx(s); 661 free(sin6, M_SONAME); 662 return EINVAL; 663 } 664 sin6->sin6_port = inp->inp_lport; 665 sin6->sin6_addr = inp->in6p_laddr; 666 splx(s); 667 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 668 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 669 else 670 sin6->sin6_scope_id = 0; /*XXX*/ 671 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 672 sin6->sin6_addr.s6_addr16[1] = 0; 673 674 *nam = (struct sockaddr *)sin6; 675 return 0; 676 } 677 678 int 679 in6_setpeeraddr(so, nam) 680 struct socket *so; 681 struct sockaddr **nam; 682 { 683 int s; 684 struct inpcb *inp; 685 struct sockaddr_in6 *sin6; 686 687 /* 688 * Do the malloc first in case it blocks. 689 */ 690 MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK); 691 bzero((caddr_t)sin6, sizeof (*sin6)); 692 sin6->sin6_family = AF_INET6; 693 sin6->sin6_len = sizeof(struct sockaddr_in6); 694 695 s = splnet(); 696 inp = sotoinpcb(so); 697 if (!inp) { 698 splx(s); 699 free(sin6, M_SONAME); 700 return EINVAL; 701 } 702 sin6->sin6_port = inp->inp_fport; 703 sin6->sin6_addr = inp->in6p_faddr; 704 splx(s); 705 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 706 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 707 else 708 sin6->sin6_scope_id = 0; /*XXX*/ 709 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 710 sin6->sin6_addr.s6_addr16[1] = 0; 711 712 *nam = (struct sockaddr *)sin6; 713 return 0; 714 } 715 716 int 717 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 718 { 719 struct inpcb *inp = sotoinpcb(so); 720 int error; 721 722 if (inp == NULL) 723 return EINVAL; 724 if (inp->inp_vflag & INP_IPV4) { 725 error = in_setsockaddr(so, nam); 726 if (error == 0) 727 in6_sin_2_v4mapsin6_in_sock(nam); 728 } else 729 /* scope issues will be handled in in6_setsockaddr(). */ 730 error = in6_setsockaddr(so, nam); 731 732 return error; 733 } 734 735 int 736 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 737 { 738 struct inpcb *inp = sotoinpcb(so); 739 int error; 740 741 if (inp == NULL) 742 return EINVAL; 743 if (inp->inp_vflag & INP_IPV4) { 744 error = in_setpeeraddr(so, nam); 745 if (error == 0) 746 in6_sin_2_v4mapsin6_in_sock(nam); 747 } else 748 /* scope issues will be handled in in6_setpeeraddr(). */ 749 error = in6_setpeeraddr(so, nam); 750 751 return error; 752 } 753 754 /* 755 * Pass some notification to all connections of a protocol 756 * associated with address dst. The local address and/or port numbers 757 * may be specified to limit the search. The "usual action" will be 758 * taken, depending on the ctlinput cmd. The caller must filter any 759 * cmds that are uninteresting (e.g., no error in the map). 760 * Call the protocol specific routine (if any) to report 761 * any errors for each matching socket. 762 * 763 * Must be called at splnet. 764 */ 765 void 766 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify) 767 struct inpcbhead *head; 768 struct sockaddr *dst; 769 u_int fport_arg; 770 const struct sockaddr *src; 771 u_int lport_arg; 772 int cmd; 773 void (*notify) (struct inpcb *, int); 774 { 775 struct inpcb *inp, *ninp; 776 struct sockaddr_in6 sa6_src, *sa6_dst; 777 u_short fport = fport_arg, lport = lport_arg; 778 u_int32_t flowinfo; 779 int errno, s; 780 781 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 782 return; 783 784 sa6_dst = (struct sockaddr_in6 *)dst; 785 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 786 return; 787 788 /* 789 * note that src can be NULL when we get notify by local fragmentation. 790 */ 791 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 792 flowinfo = sa6_src.sin6_flowinfo; 793 794 /* 795 * Redirects go to all references to the destination, 796 * and use in6_rtchange to invalidate the route cache. 797 * Dead host indications: also use in6_rtchange to invalidate 798 * the cache, and deliver the error to all the sockets. 799 * Otherwise, if we have knowledge of the local port and address, 800 * deliver only to that socket. 801 */ 802 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 803 fport = 0; 804 lport = 0; 805 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 806 807 if (cmd != PRC_HOSTDEAD) 808 notify = in6_rtchange; 809 } 810 errno = inet6ctlerrmap[cmd]; 811 s = splnet(); 812 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 813 ninp = LIST_NEXT(inp, inp_list); 814 815 if ((inp->inp_vflag & INP_IPV6) == 0) 816 continue; 817 818 /* 819 * Detect if we should notify the error. If no source and 820 * destination ports are specifed, but non-zero flowinfo and 821 * local address match, notify the error. This is the case 822 * when the error is delivered with an encrypted buffer 823 * by ESP. Otherwise, just compare addresses and ports 824 * as usual. 825 */ 826 if (lport == 0 && fport == 0 && flowinfo && 827 inp->inp_socket != NULL && 828 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 829 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 830 goto do_notify; 831 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 832 &sa6_dst->sin6_addr) || 833 inp->inp_socket == 0 || 834 (lport && inp->inp_lport != lport) || 835 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 836 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 837 &sa6_src.sin6_addr)) || 838 (fport && inp->inp_fport != fport)) 839 continue; 840 841 do_notify: 842 if (notify) 843 (*notify)(inp, errno); 844 } 845 splx(s); 846 } 847 848 /* 849 * Lookup a PCB based on the local address and port. 850 */ 851 struct inpcb * 852 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 853 struct inpcbinfo *pcbinfo; 854 struct in6_addr *laddr; 855 u_int lport_arg; 856 int wild_okay; 857 { 858 struct inpcb *inp; 859 int matchwild = 3, wildcard; 860 u_short lport = lport_arg; 861 struct inpcbporthead *porthash; 862 struct inpcbport *phd; 863 struct inpcb *match = NULL; 864 865 /* 866 * Best fit PCB lookup. 867 * 868 * First see if this local port is in use by looking on the 869 * port hash list. 870 */ 871 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 872 pcbinfo->porthashmask)]; 873 LIST_FOREACH(phd, porthash, phd_hash) { 874 if (phd->phd_port == lport) 875 break; 876 } 877 if (phd != NULL) { 878 /* 879 * Port is in use by one or more PCBs. Look for best 880 * fit. 881 */ 882 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 883 wildcard = 0; 884 if ((inp->inp_vflag & INP_IPV6) == 0) 885 continue; 886 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 887 wildcard++; 888 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 889 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 890 wildcard++; 891 else if (!IN6_ARE_ADDR_EQUAL( 892 &inp->in6p_laddr, laddr)) 893 continue; 894 } else { 895 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 896 wildcard++; 897 } 898 if (wildcard && !wild_okay) 899 continue; 900 if (wildcard < matchwild) { 901 match = inp; 902 if (wildcard == 0) 903 break; 904 else 905 matchwild = wildcard; 906 } 907 } 908 } 909 return (match); 910 } 911 912 void 913 in6_pcbpurgeif0(head, ifp) 914 struct in6pcb *head; 915 struct ifnet *ifp; 916 { 917 struct in6pcb *in6p; 918 struct ip6_moptions *im6o; 919 struct in6_multi_mship *imm, *nimm; 920 921 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 922 im6o = in6p->in6p_moptions; 923 if ((in6p->inp_vflag & INP_IPV6) && 924 im6o) { 925 /* 926 * Unselect the outgoing interface if it is being 927 * detached. 928 */ 929 if (im6o->im6o_multicast_ifp == ifp) 930 im6o->im6o_multicast_ifp = NULL; 931 932 /* 933 * Drop multicast group membership if we joined 934 * through the interface being detached. 935 * XXX controversial - is it really legal for kernel 936 * to force this? 937 */ 938 for (imm = im6o->im6o_memberships.lh_first; 939 imm != NULL; imm = nimm) { 940 nimm = imm->i6mm_chain.le_next; 941 if (imm->i6mm_maddr->in6m_ifp == ifp) { 942 LIST_REMOVE(imm, i6mm_chain); 943 in6_delmulti(imm->i6mm_maddr); 944 free(imm, M_IPMADDR); 945 } 946 } 947 } 948 } 949 } 950 951 /* 952 * Check for alternatives when higher level complains 953 * about service problems. For now, invalidate cached 954 * routing information. If the route was created dynamically 955 * (by a redirect), time to try a default gateway again. 956 */ 957 void 958 in6_losing(in6p) 959 struct inpcb *in6p; 960 { 961 struct rtentry *rt; 962 struct rt_addrinfo info; 963 964 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 965 bzero((caddr_t)&info, sizeof(info)); 966 info.rti_flags = rt->rt_flags; 967 info.rti_info[RTAX_DST] = rt_key(rt); 968 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 969 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 970 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 971 if (rt->rt_flags & RTF_DYNAMIC) 972 (void)rtrequest1(RTM_DELETE, &info, NULL); 973 in6p->in6p_route.ro_rt = NULL; 974 rtfree(rt); 975 /* 976 * A new route can be allocated 977 * the next time output is attempted. 978 */ 979 } 980 } 981 982 /* 983 * After a routing change, flush old routing 984 * and allocate a (hopefully) better one. 985 */ 986 void 987 in6_rtchange(inp, errno) 988 struct inpcb *inp; 989 int errno; 990 { 991 if (inp->in6p_route.ro_rt) { 992 rtfree(inp->in6p_route.ro_rt); 993 inp->in6p_route.ro_rt = 0; 994 /* 995 * A new route can be allocated the next time 996 * output is attempted. 997 */ 998 } 999 } 1000 1001 /* 1002 * Lookup PCB in hash list. 1003 */ 1004 struct inpcb * 1005 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 1006 struct inpcbinfo *pcbinfo; 1007 struct in6_addr *faddr, *laddr; 1008 u_int fport_arg, lport_arg; 1009 int wildcard; 1010 struct ifnet *ifp; 1011 { 1012 struct inpcbhead *head; 1013 struct inpcb *inp; 1014 u_short fport = fport_arg, lport = lport_arg; 1015 int faith; 1016 1017 if (faithprefix_p != NULL) 1018 faith = (*faithprefix_p)(laddr); 1019 else 1020 faith = 0; 1021 1022 /* 1023 * First look for an exact match. 1024 */ 1025 head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */, 1026 fport, 1027 laddr->s6_addr32[3], /* XXX JH */ 1028 lport, 1029 pcbinfo->hashmask)]; 1030 LIST_FOREACH(inp, head, inp_hash) { 1031 if ((inp->inp_vflag & INP_IPV6) == 0) 1032 continue; 1033 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 1034 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 1035 inp->inp_fport == fport && 1036 inp->inp_lport == lport) { 1037 /* 1038 * Found. 1039 */ 1040 return (inp); 1041 } 1042 } 1043 if (wildcard) { 1044 struct inpcb *local_wild = NULL; 1045 1046 head = &pcbinfo->hashbase[INP_PCBBINDHASH(lport, 1047 pcbinfo->hashmask)]; 1048 LIST_FOREACH(inp, head, inp_hash) { 1049 if ((inp->inp_vflag & INP_IPV6) == 0) 1050 continue; 1051 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1052 inp->inp_lport == lport) { 1053 if (faith && (inp->inp_flags & INP_FAITH) == 0) 1054 continue; 1055 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 1056 laddr)) 1057 return (inp); 1058 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1059 local_wild = inp; 1060 } 1061 } 1062 return (local_wild); 1063 } 1064 1065 /* 1066 * Not found. 1067 */ 1068 return (NULL); 1069 } 1070 1071 void 1072 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 1073 { 1074 struct ip6_hdr *ip; 1075 1076 ip = mtod(m, struct ip6_hdr *); 1077 bzero(sin6, sizeof(*sin6)); 1078 sin6->sin6_len = sizeof(*sin6); 1079 sin6->sin6_family = AF_INET6; 1080 sin6->sin6_addr = ip->ip6_src; 1081 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1082 sin6->sin6_addr.s6_addr16[1] = 0; 1083 sin6->sin6_scope_id = 1084 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1085 ? m->m_pkthdr.rcvif->if_index : 0; 1086 1087 return; 1088 } 1089