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