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/uma.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_cred(td->td_ucred, 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 * in6_pcbladdr() may automatically fill in sin6_scope_id. 347 */ 348 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 349 return(error); 350 351 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 352 sin6->sin6_port, 353 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 354 ? addr6 : &inp->in6p_laddr, 355 inp->inp_lport, 0, NULL) != NULL) { 356 return (EADDRINUSE); 357 } 358 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 359 if (inp->inp_lport == 0) { 360 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 361 if (error) 362 return (error); 363 } 364 inp->in6p_laddr = *addr6; 365 } 366 inp->in6p_faddr = sin6->sin6_addr; 367 inp->inp_fport = sin6->sin6_port; 368 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 369 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 370 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 371 inp->in6p_flowinfo |= 372 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 373 374 in_pcbrehash(inp); 375 return (0); 376 } 377 378 #if 0 379 /* 380 * Return an IPv6 address, which is the most appropriate for given 381 * destination and user specified options. 382 * If necessary, this function lookups the routing table and return 383 * an entry to the caller for later use. 384 */ 385 struct in6_addr * 386 in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp) 387 struct sockaddr_in6 *dstsock; 388 struct ip6_pktopts *opts; 389 struct ip6_moptions *mopts; 390 struct route_in6 *ro; 391 struct in6_addr *laddr; 392 int *errorp; 393 { 394 struct in6_addr *dst; 395 struct in6_ifaddr *ia6 = 0; 396 struct in6_pktinfo *pi = NULL; 397 398 dst = &dstsock->sin6_addr; 399 *errorp = 0; 400 401 /* 402 * If the source address is explicitly specified by the caller, 403 * use it. 404 */ 405 if (opts && (pi = opts->ip6po_pktinfo) && 406 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) 407 return(&pi->ipi6_addr); 408 409 /* 410 * If the source address is not specified but the socket(if any) 411 * is already bound, use the bound address. 412 */ 413 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) 414 return(laddr); 415 416 /* 417 * If the caller doesn't specify the source address but 418 * the outgoing interface, use an address associated with 419 * the interface. 420 */ 421 if (pi && pi->ipi6_ifindex) { 422 /* XXX boundary check is assumed to be already done. */ 423 ia6 = in6_ifawithscope(ifnet_byindex(pi->ipi6_ifindex), dst); 424 if (ia6 == 0) { 425 *errorp = EADDRNOTAVAIL; 426 return(0); 427 } 428 return(&satosin6(&ia6->ia_addr)->sin6_addr); 429 } 430 431 /* 432 * If the destination address is a link-local unicast address or 433 * a multicast address, and if the outgoing interface is specified 434 * by the sin6_scope_id filed, use an address associated with the 435 * interface. 436 * XXX: We're now trying to define more specific semantics of 437 * sin6_scope_id field, so this part will be rewritten in 438 * the near future. 439 */ 440 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && 441 dstsock->sin6_scope_id) { 442 /* 443 * I'm not sure if boundary check for scope_id is done 444 * somewhere... 445 */ 446 if (dstsock->sin6_scope_id < 0 || 447 if_index < dstsock->sin6_scope_id) { 448 *errorp = ENXIO; /* XXX: better error? */ 449 return(0); 450 } 451 ia6 = in6_ifawithscope(ifnet_byindex(dstsock->sin6_scope_id), 452 dst); 453 if (ia6 == 0) { 454 *errorp = EADDRNOTAVAIL; 455 return(0); 456 } 457 return(&satosin6(&ia6->ia_addr)->sin6_addr); 458 } 459 460 /* 461 * If the destination address is a multicast address and 462 * the outgoing interface for the address is specified 463 * by the caller, use an address associated with the interface. 464 * There is a sanity check here; if the destination has node-local 465 * scope, the outgoing interfacde should be a loopback address. 466 * Even if the outgoing interface is not specified, we also 467 * choose a loopback interface as the outgoing interface. 468 */ 469 if (IN6_IS_ADDR_MULTICAST(dst)) { 470 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; 471 472 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { 473 ifp = &loif[0]; 474 } 475 476 if (ifp) { 477 ia6 = in6_ifawithscope(ifp, dst); 478 if (ia6 == 0) { 479 *errorp = EADDRNOTAVAIL; 480 return(0); 481 } 482 return(&ia6->ia_addr.sin6_addr); 483 } 484 } 485 486 /* 487 * If the next hop address for the packet is specified 488 * by caller, use an address associated with the route 489 * to the next hop. 490 */ 491 { 492 struct sockaddr_in6 *sin6_next; 493 struct rtentry *rt; 494 495 if (opts && opts->ip6po_nexthop) { 496 sin6_next = satosin6(opts->ip6po_nexthop); 497 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); 498 if (rt) { 499 ia6 = in6_ifawithscope(rt->rt_ifp, dst); 500 if (ia6 == 0) 501 ia6 = ifatoia6(rt->rt_ifa); 502 } 503 if (ia6 == 0) { 504 *errorp = EADDRNOTAVAIL; 505 return(0); 506 } 507 return(&satosin6(&ia6->ia_addr)->sin6_addr); 508 } 509 } 510 511 /* 512 * If route is known or can be allocated now, 513 * our src addr is taken from the i/f, else punt. 514 */ 515 if (ro) { 516 if (ro->ro_rt && 517 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { 518 RTFREE(ro->ro_rt); 519 ro->ro_rt = (struct rtentry *)0; 520 } 521 if (ro->ro_rt == (struct rtentry *)0 || 522 ro->ro_rt->rt_ifp == (struct ifnet *)0) { 523 struct sockaddr_in6 *dst6; 524 525 /* No route yet, so try to acquire one */ 526 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); 527 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 528 dst6->sin6_family = AF_INET6; 529 dst6->sin6_len = sizeof(struct sockaddr_in6); 530 dst6->sin6_addr = *dst; 531 if (IN6_IS_ADDR_MULTICAST(dst)) { 532 ro->ro_rt = rtalloc1(&((struct route *)ro) 533 ->ro_dst, 0, 0UL); 534 } else { 535 rtalloc((struct route *)ro); 536 } 537 } 538 539 /* 540 * in_pcbconnect() checks out IFF_LOOPBACK to skip using 541 * the address. But we don't know why it does so. 542 * It is necessary to ensure the scope even for lo0 543 * so doesn't check out IFF_LOOPBACK. 544 */ 545 546 if (ro->ro_rt) { 547 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); 548 if (ia6 == 0) /* xxx scope error ?*/ 549 ia6 = ifatoia6(ro->ro_rt->rt_ifa); 550 } 551 if (ia6 == 0) { 552 *errorp = EHOSTUNREACH; /* no route */ 553 return(0); 554 } 555 return(&satosin6(&ia6->ia_addr)->sin6_addr); 556 } 557 558 *errorp = EADDRNOTAVAIL; 559 return(0); 560 } 561 562 /* 563 * Default hop limit selection. The precedence is as follows: 564 * 1. Hoplimit valued specified via ioctl. 565 * 2. (If the outgoing interface is detected) the current 566 * hop limit of the interface specified by router advertisement. 567 * 3. The system default hoplimit. 568 */ 569 int 570 in6_selecthlim(in6p, ifp) 571 struct in6pcb *in6p; 572 struct ifnet *ifp; 573 { 574 if (in6p && in6p->in6p_hops >= 0) 575 return(in6p->in6p_hops); 576 else if (ifp) 577 return(nd_ifinfo[ifp->if_index].chlim); 578 else 579 return(ip6_defhlim); 580 } 581 #endif 582 583 void 584 in6_pcbdisconnect(inp) 585 struct inpcb *inp; 586 { 587 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 588 inp->inp_fport = 0; 589 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 590 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 591 in_pcbrehash(inp); 592 if (inp->inp_socket->so_state & SS_NOFDREF) 593 in6_pcbdetach(inp); 594 } 595 596 void 597 in6_pcbdetach(inp) 598 struct inpcb *inp; 599 { 600 struct socket *so = inp->inp_socket; 601 struct inpcbinfo *ipi = inp->inp_pcbinfo; 602 603 #ifdef IPSEC 604 if (inp->in6p_sp != NULL) 605 ipsec6_delete_pcbpolicy(inp); 606 #endif /* IPSEC */ 607 inp->inp_gencnt = ++ipi->ipi_gencnt; 608 in_pcbremlists(inp); 609 sotoinpcb(so) = 0; 610 sotryfree(so); 611 612 if (inp->in6p_options) 613 m_freem(inp->in6p_options); 614 ip6_freepcbopts(inp->in6p_outputopts); 615 ip6_freemoptions(inp->in6p_moptions); 616 if (inp->in6p_route.ro_rt) 617 rtfree(inp->in6p_route.ro_rt); 618 /* Check and free IPv4 related resources in case of mapped addr */ 619 if (inp->inp_options) 620 (void)m_free(inp->inp_options); 621 ip_freemoptions(inp->inp_moptions); 622 623 inp->inp_vflag = 0; 624 uma_zfree(ipi->ipi_zone, inp); 625 } 626 627 /* 628 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 629 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 630 * in struct pr_usrreqs, so that protocols can just reference then directly 631 * without the need for a wrapper function. The socket must have a valid 632 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 633 * except through a kernel programming error, so it is acceptable to panic 634 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 635 * because there actually /is/ a programming error somewhere... XXX) 636 */ 637 int 638 in6_setsockaddr(so, nam) 639 struct socket *so; 640 struct sockaddr **nam; 641 { 642 int s; 643 register struct inpcb *inp; 644 register struct sockaddr_in6 *sin6; 645 646 /* 647 * Do the malloc first in case it blocks. 648 */ 649 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 650 bzero(sin6, sizeof *sin6); 651 sin6->sin6_family = AF_INET6; 652 sin6->sin6_len = sizeof(*sin6); 653 654 s = splnet(); 655 inp = sotoinpcb(so); 656 if (!inp) { 657 splx(s); 658 free(sin6, M_SONAME); 659 return EINVAL; 660 } 661 sin6->sin6_port = inp->inp_lport; 662 sin6->sin6_addr = inp->in6p_laddr; 663 splx(s); 664 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 665 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 666 else 667 sin6->sin6_scope_id = 0; /*XXX*/ 668 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 669 sin6->sin6_addr.s6_addr16[1] = 0; 670 671 *nam = (struct sockaddr *)sin6; 672 return 0; 673 } 674 675 int 676 in6_setpeeraddr(so, nam) 677 struct socket *so; 678 struct sockaddr **nam; 679 { 680 int s; 681 struct inpcb *inp; 682 register struct sockaddr_in6 *sin6; 683 684 /* 685 * Do the malloc first in case it blocks. 686 */ 687 MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK); 688 bzero((caddr_t)sin6, sizeof (*sin6)); 689 sin6->sin6_family = AF_INET6; 690 sin6->sin6_len = sizeof(struct sockaddr_in6); 691 692 s = splnet(); 693 inp = sotoinpcb(so); 694 if (!inp) { 695 splx(s); 696 free(sin6, M_SONAME); 697 return EINVAL; 698 } 699 sin6->sin6_port = inp->inp_fport; 700 sin6->sin6_addr = inp->in6p_faddr; 701 splx(s); 702 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 703 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 704 else 705 sin6->sin6_scope_id = 0; /*XXX*/ 706 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 707 sin6->sin6_addr.s6_addr16[1] = 0; 708 709 *nam = (struct sockaddr *)sin6; 710 return 0; 711 } 712 713 int 714 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 715 { 716 struct inpcb *inp = sotoinpcb(so); 717 int error; 718 719 if (inp == NULL) 720 return EINVAL; 721 if (inp->inp_vflag & INP_IPV4) { 722 error = in_setsockaddr(so, nam); 723 if (error == 0) 724 in6_sin_2_v4mapsin6_in_sock(nam); 725 } else 726 /* scope issues will be handled in in6_setsockaddr(). */ 727 error = in6_setsockaddr(so, nam); 728 729 return error; 730 } 731 732 int 733 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 734 { 735 struct inpcb *inp = sotoinpcb(so); 736 int error; 737 738 if (inp == NULL) 739 return EINVAL; 740 if (inp->inp_vflag & INP_IPV4) { 741 error = in_setpeeraddr(so, nam); 742 if (error == 0) 743 in6_sin_2_v4mapsin6_in_sock(nam); 744 } else 745 /* scope issues will be handled in in6_setpeeraddr(). */ 746 error = in6_setpeeraddr(so, nam); 747 748 return error; 749 } 750 751 /* 752 * Pass some notification to all connections of a protocol 753 * associated with address dst. The local address and/or port numbers 754 * may be specified to limit the search. The "usual action" will be 755 * taken, depending on the ctlinput cmd. The caller must filter any 756 * cmds that are uninteresting (e.g., no error in the map). 757 * Call the protocol specific routine (if any) to report 758 * any errors for each matching socket. 759 * 760 * Must be called at splnet. 761 */ 762 void 763 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify) 764 struct inpcbhead *head; 765 struct sockaddr *dst; 766 const struct sockaddr *src; 767 u_int fport_arg, lport_arg; 768 int cmd; 769 void (*notify) __P((struct inpcb *, int)); 770 { 771 struct inpcb *inp, *ninp; 772 struct sockaddr_in6 sa6_src, *sa6_dst; 773 u_short fport = fport_arg, lport = lport_arg; 774 u_int32_t flowinfo; 775 int errno, s; 776 777 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 778 return; 779 780 sa6_dst = (struct sockaddr_in6 *)dst; 781 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 782 return; 783 784 /* 785 * note that src can be NULL when we get notify by local fragmentation. 786 */ 787 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 788 flowinfo = sa6_src.sin6_flowinfo; 789 790 /* 791 * Redirects go to all references to the destination, 792 * and use in6_rtchange to invalidate the route cache. 793 * Dead host indications: also use in6_rtchange to invalidate 794 * the cache, and deliver the error to all the sockets. 795 * Otherwise, if we have knowledge of the local port and address, 796 * deliver only to that socket. 797 */ 798 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 799 fport = 0; 800 lport = 0; 801 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 802 803 if (cmd != PRC_HOSTDEAD) 804 notify = in6_rtchange; 805 } 806 errno = inet6ctlerrmap[cmd]; 807 s = splnet(); 808 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 809 ninp = LIST_NEXT(inp, inp_list); 810 811 if ((inp->inp_vflag & INP_IPV6) == 0) 812 continue; 813 814 /* 815 * Detect if we should notify the error. If no source and 816 * destination ports are specifed, but non-zero flowinfo and 817 * local address match, notify the error. This is the case 818 * when the error is delivered with an encrypted buffer 819 * by ESP. Otherwise, just compare addresses and ports 820 * as usual. 821 */ 822 if (lport == 0 && fport == 0 && flowinfo && 823 inp->inp_socket != NULL && 824 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 825 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 826 goto do_notify; 827 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 828 &sa6_dst->sin6_addr) || 829 inp->inp_socket == 0 || 830 (lport && inp->inp_lport != lport) || 831 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 832 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 833 &sa6_src.sin6_addr)) || 834 (fport && inp->inp_fport != fport)) 835 continue; 836 837 do_notify: 838 if (notify) 839 (*notify)(inp, errno); 840 } 841 splx(s); 842 } 843 844 /* 845 * Lookup a PCB based on the local address and port. 846 */ 847 struct inpcb * 848 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 849 struct inpcbinfo *pcbinfo; 850 struct in6_addr *laddr; 851 u_int lport_arg; 852 int wild_okay; 853 { 854 register struct inpcb *inp; 855 int matchwild = 3, wildcard; 856 u_short lport = lport_arg; 857 858 if (!wild_okay) { 859 struct inpcbhead *head; 860 /* 861 * Look for an unconnected (wildcard foreign addr) PCB that 862 * matches the local address and port we're looking for. 863 */ 864 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 865 pcbinfo->hashmask)]; 866 LIST_FOREACH(inp, head, inp_hash) { 867 if ((inp->inp_vflag & INP_IPV6) == 0) 868 continue; 869 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 870 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 871 inp->inp_lport == lport) { 872 /* 873 * Found. 874 */ 875 return (inp); 876 } 877 } 878 /* 879 * Not found. 880 */ 881 return (NULL); 882 } else { 883 struct inpcbporthead *porthash; 884 struct inpcbport *phd; 885 struct inpcb *match = NULL; 886 /* 887 * Best fit PCB lookup. 888 * 889 * First see if this local port is in use by looking on the 890 * port hash list. 891 */ 892 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 893 pcbinfo->porthashmask)]; 894 LIST_FOREACH(phd, porthash, phd_hash) { 895 if (phd->phd_port == lport) 896 break; 897 } 898 if (phd != NULL) { 899 /* 900 * Port is in use by one or more PCBs. Look for best 901 * fit. 902 */ 903 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 904 wildcard = 0; 905 if ((inp->inp_vflag & INP_IPV6) == 0) 906 continue; 907 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 908 wildcard++; 909 if (!IN6_IS_ADDR_UNSPECIFIED( 910 &inp->in6p_laddr)) { 911 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 912 wildcard++; 913 else if (!IN6_ARE_ADDR_EQUAL( 914 &inp->in6p_laddr, laddr)) 915 continue; 916 } else { 917 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 918 wildcard++; 919 } 920 if (wildcard < matchwild) { 921 match = inp; 922 matchwild = wildcard; 923 if (matchwild == 0) { 924 break; 925 } 926 } 927 } 928 } 929 return (match); 930 } 931 } 932 933 void 934 in6_pcbpurgeif0(head, ifp) 935 struct in6pcb *head; 936 struct ifnet *ifp; 937 { 938 struct in6pcb *in6p; 939 struct ip6_moptions *im6o; 940 struct in6_multi_mship *imm, *nimm; 941 942 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 943 im6o = in6p->in6p_moptions; 944 if ((in6p->inp_vflag & INP_IPV6) && 945 im6o) { 946 /* 947 * Unselect the outgoing interface if it is being 948 * detached. 949 */ 950 if (im6o->im6o_multicast_ifp == ifp) 951 im6o->im6o_multicast_ifp = NULL; 952 953 /* 954 * Drop multicast group membership if we joined 955 * through the interface being detached. 956 * XXX controversial - is it really legal for kernel 957 * to force this? 958 */ 959 for (imm = im6o->im6o_memberships.lh_first; 960 imm != NULL; imm = nimm) { 961 nimm = imm->i6mm_chain.le_next; 962 if (imm->i6mm_maddr->in6m_ifp == ifp) { 963 LIST_REMOVE(imm, i6mm_chain); 964 in6_delmulti(imm->i6mm_maddr); 965 free(imm, M_IPMADDR); 966 } 967 } 968 } 969 } 970 } 971 972 /* 973 * Check for alternatives when higher level complains 974 * about service problems. For now, invalidate cached 975 * routing information. If the route was created dynamically 976 * (by a redirect), time to try a default gateway again. 977 */ 978 void 979 in6_losing(in6p) 980 struct inpcb *in6p; 981 { 982 struct rtentry *rt; 983 struct rt_addrinfo info; 984 985 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 986 bzero((caddr_t)&info, sizeof(info)); 987 info.rti_flags = rt->rt_flags; 988 info.rti_info[RTAX_DST] = rt_key(rt); 989 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 990 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 991 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 992 if (rt->rt_flags & RTF_DYNAMIC) 993 (void)rtrequest1(RTM_DELETE, &info, NULL); 994 in6p->in6p_route.ro_rt = NULL; 995 rtfree(rt); 996 /* 997 * A new route can be allocated 998 * the next time output is attempted. 999 */ 1000 } 1001 } 1002 1003 /* 1004 * After a routing change, flush old routing 1005 * and allocate a (hopefully) better one. 1006 */ 1007 void 1008 in6_rtchange(inp, errno) 1009 struct inpcb *inp; 1010 int errno; 1011 { 1012 if (inp->in6p_route.ro_rt) { 1013 rtfree(inp->in6p_route.ro_rt); 1014 inp->in6p_route.ro_rt = 0; 1015 /* 1016 * A new route can be allocated the next time 1017 * output is attempted. 1018 */ 1019 } 1020 } 1021 1022 /* 1023 * Lookup PCB in hash list. 1024 */ 1025 struct inpcb * 1026 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 1027 struct inpcbinfo *pcbinfo; 1028 struct in6_addr *faddr, *laddr; 1029 u_int fport_arg, lport_arg; 1030 int wildcard; 1031 struct ifnet *ifp; 1032 { 1033 struct inpcbhead *head; 1034 register struct inpcb *inp; 1035 u_short fport = fport_arg, lport = lport_arg; 1036 int faith; 1037 1038 if (faithprefix_p != NULL) 1039 faith = (*faithprefix_p)(laddr); 1040 else 1041 faith = 0; 1042 1043 /* 1044 * First look for an exact match. 1045 */ 1046 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 1047 lport, fport, 1048 pcbinfo->hashmask)]; 1049 LIST_FOREACH(inp, head, inp_hash) { 1050 if ((inp->inp_vflag & INP_IPV6) == 0) 1051 continue; 1052 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 1053 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 1054 inp->inp_fport == fport && 1055 inp->inp_lport == lport) { 1056 /* 1057 * Found. 1058 */ 1059 return (inp); 1060 } 1061 } 1062 if (wildcard) { 1063 struct inpcb *local_wild = NULL; 1064 1065 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 1066 pcbinfo->hashmask)]; 1067 LIST_FOREACH(inp, head, inp_hash) { 1068 if ((inp->inp_vflag & INP_IPV6) == 0) 1069 continue; 1070 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1071 inp->inp_lport == lport) { 1072 if (faith && (inp->inp_flags & INP_FAITH) == 0) 1073 continue; 1074 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 1075 laddr)) 1076 return (inp); 1077 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1078 local_wild = inp; 1079 } 1080 } 1081 return (local_wild); 1082 } 1083 1084 /* 1085 * Not found. 1086 */ 1087 return (NULL); 1088 } 1089 1090 void 1091 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 1092 { 1093 struct ip6_hdr *ip; 1094 1095 ip = mtod(m, struct ip6_hdr *); 1096 bzero(sin6, sizeof(*sin6)); 1097 sin6->sin6_len = sizeof(*sin6); 1098 sin6->sin6_family = AF_INET6; 1099 sin6->sin6_addr = ip->ip6_src; 1100 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1101 sin6->sin6_addr.s6_addr16[1] = 0; 1102 sin6->sin6_scope_id = 1103 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1104 ? m->m_pkthdr.rcvif->if_index : 0; 1105 1106 return; 1107 } 1108