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sys/netinet6/in6_pcb.c
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1 /* $FreeBSD: releng/5.0/sys/netinet6/in6_pcb.c 105199 2002-10-16 02:25:05Z sam $ */ 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/tcp_var.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 <netkey/key.h> 114 #endif /* IPSEC */ 115 116 #ifdef FAST_IPSEC 117 #include <netipsec/ipsec.h> 118 #include <netipsec/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(inp, nam, td) 127 register struct inpcb *inp; 128 struct sockaddr *nam; 129 struct thread *td; 130 { 131 struct socket *so = inp->inp_socket; 132 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 133 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 134 u_short lport = 0; 135 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 136 137 if (!in6_ifaddr) /* XXX broken! */ 138 return (EADDRNOTAVAIL); 139 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 140 return(EINVAL); 141 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 142 wild = 1; 143 if (nam) { 144 sin6 = (struct sockaddr_in6 *)nam; 145 if (nam->sa_len != sizeof(*sin6)) 146 return(EINVAL); 147 /* 148 * family check. 149 */ 150 if (nam->sa_family != AF_INET6) 151 return(EAFNOSUPPORT); 152 153 /* KAME hack: embed scopeid */ 154 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 155 return EINVAL; 156 /* this must be cleared for ifa_ifwithaddr() */ 157 sin6->sin6_scope_id = 0; 158 159 lport = sin6->sin6_port; 160 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 161 /* 162 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 163 * allow compepte duplication of binding if 164 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 165 * and a multicast address is bound on both 166 * new and duplicated sockets. 167 */ 168 if (so->so_options & SO_REUSEADDR) 169 reuseport = SO_REUSEADDR|SO_REUSEPORT; 170 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 171 struct ifaddr *ia = NULL; 172 173 sin6->sin6_port = 0; /* yech... */ 174 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 175 return(EADDRNOTAVAIL); 176 177 /* 178 * XXX: bind to an anycast address might accidentally 179 * cause sending a packet with anycast source address. 180 * We should allow to bind to a deprecated address, since 181 * the application dare to use it. 182 */ 183 if (ia && 184 ((struct in6_ifaddr *)ia)->ia6_flags & 185 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 186 return(EADDRNOTAVAIL); 187 } 188 } 189 if (lport) { 190 struct inpcb *t; 191 192 /* GROSS */ 193 if (ntohs(lport) < IPV6PORT_RESERVED && td && 194 suser_cred(td->td_ucred, PRISON_ROOT)) 195 return(EACCES); 196 if (so->so_cred->cr_uid != 0 && 197 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 198 t = in6_pcblookup_local(pcbinfo, 199 &sin6->sin6_addr, lport, 200 INPLOOKUP_WILDCARD); 201 if (t && 202 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 203 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 204 (t->inp_socket->so_options & 205 SO_REUSEPORT) == 0) && 206 (so->so_cred->cr_uid != 207 t->inp_socket->so_cred->cr_uid)) 208 return (EADDRINUSE); 209 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 210 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 211 struct sockaddr_in sin; 212 213 in6_sin6_2_sin(&sin, sin6); 214 t = in_pcblookup_local(pcbinfo, 215 sin.sin_addr, lport, 216 INPLOOKUP_WILDCARD); 217 if (t && 218 (so->so_cred->cr_uid != 219 t->inp_socket->so_cred->cr_uid) && 220 (ntohl(t->inp_laddr.s_addr) != 221 INADDR_ANY || 222 INP_SOCKAF(so) == 223 INP_SOCKAF(t->inp_socket))) 224 return (EADDRINUSE); 225 } 226 } 227 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 228 lport, wild); 229 if (t && (reuseport & t->inp_socket->so_options) == 0) 230 return(EADDRINUSE); 231 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 232 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 233 struct sockaddr_in sin; 234 235 in6_sin6_2_sin(&sin, sin6); 236 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 237 lport, wild); 238 if (t && 239 (reuseport & t->inp_socket->so_options) 240 == 0 && 241 (ntohl(t->inp_laddr.s_addr) 242 != INADDR_ANY || 243 INP_SOCKAF(so) == 244 INP_SOCKAF(t->inp_socket))) 245 return (EADDRINUSE); 246 } 247 } 248 inp->in6p_laddr = sin6->sin6_addr; 249 } 250 if (lport == 0) { 251 int e; 252 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0) 253 return(e); 254 } 255 else { 256 inp->inp_lport = lport; 257 if (in_pcbinshash(inp) != 0) { 258 inp->in6p_laddr = in6addr_any; 259 inp->inp_lport = 0; 260 return (EAGAIN); 261 } 262 } 263 return(0); 264 } 265 266 /* 267 * Transform old in6_pcbconnect() into an inner subroutine for new 268 * in6_pcbconnect(): Do some validity-checking on the remote 269 * address (in mbuf 'nam') and then determine local host address 270 * (i.e., which interface) to use to access that remote host. 271 * 272 * This preserves definition of in6_pcbconnect(), while supporting a 273 * slightly different version for T/TCP. (This is more than 274 * a bit of a kludge, but cleaning up the internal interfaces would 275 * have forced minor changes in every protocol). 276 */ 277 278 int 279 in6_pcbladdr(inp, nam, plocal_addr6) 280 register struct inpcb *inp; 281 struct sockaddr *nam; 282 struct in6_addr **plocal_addr6; 283 { 284 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 285 struct ifnet *ifp = NULL; 286 int error = 0; 287 288 if (nam->sa_len != sizeof (*sin6)) 289 return (EINVAL); 290 if (sin6->sin6_family != AF_INET6) 291 return (EAFNOSUPPORT); 292 if (sin6->sin6_port == 0) 293 return (EADDRNOTAVAIL); 294 295 /* KAME hack: embed scopeid */ 296 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 297 return EINVAL; 298 299 if (in6_ifaddr) { 300 /* 301 * If the destination address is UNSPECIFIED addr, 302 * use the loopback addr, e.g ::1. 303 */ 304 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 305 sin6->sin6_addr = in6addr_loopback; 306 } 307 { 308 /* 309 * XXX: in6_selectsrc might replace the bound local address 310 * with the address specified by setsockopt(IPV6_PKTINFO). 311 * Is it the intended behavior? 312 */ 313 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 314 inp->in6p_moptions, 315 &inp->in6p_route, 316 &inp->in6p_laddr, &error); 317 if (*plocal_addr6 == 0) { 318 if (error == 0) 319 error = EADDRNOTAVAIL; 320 return(error); 321 } 322 /* 323 * Don't do pcblookup call here; return interface in 324 * plocal_addr6 325 * and exit to caller, that will do the lookup. 326 */ 327 } 328 329 if (inp->in6p_route.ro_rt) 330 ifp = inp->in6p_route.ro_rt->rt_ifp; 331 332 return(0); 333 } 334 335 /* 336 * Outer subroutine: 337 * Connect from a socket to a specified address. 338 * Both address and port must be specified in argument sin. 339 * If don't have a local address for this socket yet, 340 * then pick one. 341 */ 342 int 343 in6_pcbconnect(inp, nam, td) 344 register struct inpcb *inp; 345 struct sockaddr *nam; 346 struct thread *td; 347 { 348 struct in6_addr *addr6; 349 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 350 int error; 351 352 /* 353 * Call inner routine, to assign local interface address. 354 * in6_pcbladdr() may automatically fill in sin6_scope_id. 355 */ 356 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 357 return(error); 358 359 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 360 sin6->sin6_port, 361 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 362 ? addr6 : &inp->in6p_laddr, 363 inp->inp_lport, 0, NULL) != NULL) { 364 return (EADDRINUSE); 365 } 366 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 367 if (inp->inp_lport == 0) { 368 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 369 if (error) 370 return (error); 371 } 372 inp->in6p_laddr = *addr6; 373 } 374 inp->in6p_faddr = sin6->sin6_addr; 375 inp->inp_fport = sin6->sin6_port; 376 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 377 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 378 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 379 inp->in6p_flowinfo |= 380 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 381 382 in_pcbrehash(inp); 383 return (0); 384 } 385 386 #if 0 387 /* 388 * Return an IPv6 address, which is the most appropriate for given 389 * destination and user specified options. 390 * If necessary, this function lookups the routing table and return 391 * an entry to the caller for later use. 392 */ 393 struct in6_addr * 394 in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp) 395 struct sockaddr_in6 *dstsock; 396 struct ip6_pktopts *opts; 397 struct ip6_moptions *mopts; 398 struct route_in6 *ro; 399 struct in6_addr *laddr; 400 int *errorp; 401 { 402 struct in6_addr *dst; 403 struct in6_ifaddr *ia6 = 0; 404 struct in6_pktinfo *pi = NULL; 405 406 dst = &dstsock->sin6_addr; 407 *errorp = 0; 408 409 /* 410 * If the source address is explicitly specified by the caller, 411 * use it. 412 */ 413 if (opts && (pi = opts->ip6po_pktinfo) && 414 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) 415 return(&pi->ipi6_addr); 416 417 /* 418 * If the source address is not specified but the socket(if any) 419 * is already bound, use the bound address. 420 */ 421 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) 422 return(laddr); 423 424 /* 425 * If the caller doesn't specify the source address but 426 * the outgoing interface, use an address associated with 427 * the interface. 428 */ 429 if (pi && pi->ipi6_ifindex) { 430 /* XXX boundary check is assumed to be already done. */ 431 ia6 = in6_ifawithscope(ifnet_byindex(pi->ipi6_ifindex), dst); 432 if (ia6 == 0) { 433 *errorp = EADDRNOTAVAIL; 434 return(0); 435 } 436 return(&satosin6(&ia6->ia_addr)->sin6_addr); 437 } 438 439 /* 440 * If the destination address is a link-local unicast address or 441 * a multicast address, and if the outgoing interface is specified 442 * by the sin6_scope_id filed, use an address associated with the 443 * interface. 444 * XXX: We're now trying to define more specific semantics of 445 * sin6_scope_id field, so this part will be rewritten in 446 * the near future. 447 */ 448 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && 449 dstsock->sin6_scope_id) { 450 /* 451 * I'm not sure if boundary check for scope_id is done 452 * somewhere... 453 */ 454 if (dstsock->sin6_scope_id < 0 || 455 if_index < dstsock->sin6_scope_id) { 456 *errorp = ENXIO; /* XXX: better error? */ 457 return(0); 458 } 459 ia6 = in6_ifawithscope(ifnet_byindex(dstsock->sin6_scope_id), 460 dst); 461 if (ia6 == 0) { 462 *errorp = EADDRNOTAVAIL; 463 return(0); 464 } 465 return(&satosin6(&ia6->ia_addr)->sin6_addr); 466 } 467 468 /* 469 * If the destination address is a multicast address and 470 * the outgoing interface for the address is specified 471 * by the caller, use an address associated with the interface. 472 * There is a sanity check here; if the destination has node-local 473 * scope, the outgoing interfacde should be a loopback address. 474 * Even if the outgoing interface is not specified, we also 475 * choose a loopback interface as the outgoing interface. 476 */ 477 if (IN6_IS_ADDR_MULTICAST(dst)) { 478 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; 479 480 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { 481 ifp = &loif[0]; 482 } 483 484 if (ifp) { 485 ia6 = in6_ifawithscope(ifp, dst); 486 if (ia6 == 0) { 487 *errorp = EADDRNOTAVAIL; 488 return(0); 489 } 490 return(&ia6->ia_addr.sin6_addr); 491 } 492 } 493 494 /* 495 * If the next hop address for the packet is specified 496 * by caller, use an address associated with the route 497 * to the next hop. 498 */ 499 { 500 struct sockaddr_in6 *sin6_next; 501 struct rtentry *rt; 502 503 if (opts && opts->ip6po_nexthop) { 504 sin6_next = satosin6(opts->ip6po_nexthop); 505 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); 506 if (rt) { 507 ia6 = in6_ifawithscope(rt->rt_ifp, dst); 508 if (ia6 == 0) 509 ia6 = ifatoia6(rt->rt_ifa); 510 } 511 if (ia6 == 0) { 512 *errorp = EADDRNOTAVAIL; 513 return(0); 514 } 515 return(&satosin6(&ia6->ia_addr)->sin6_addr); 516 } 517 } 518 519 /* 520 * If route is known or can be allocated now, 521 * our src addr is taken from the i/f, else punt. 522 */ 523 if (ro) { 524 if (ro->ro_rt && 525 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { 526 RTFREE(ro->ro_rt); 527 ro->ro_rt = (struct rtentry *)0; 528 } 529 if (ro->ro_rt == (struct rtentry *)0 || 530 ro->ro_rt->rt_ifp == (struct ifnet *)0) { 531 struct sockaddr_in6 *dst6; 532 533 /* No route yet, so try to acquire one */ 534 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); 535 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 536 dst6->sin6_family = AF_INET6; 537 dst6->sin6_len = sizeof(struct sockaddr_in6); 538 dst6->sin6_addr = *dst; 539 if (IN6_IS_ADDR_MULTICAST(dst)) { 540 ro->ro_rt = rtalloc1(&((struct route *)ro) 541 ->ro_dst, 0, 0UL); 542 } else { 543 rtalloc((struct route *)ro); 544 } 545 } 546 547 /* 548 * in_pcbconnect() checks out IFF_LOOPBACK to skip using 549 * the address. But we don't know why it does so. 550 * It is necessary to ensure the scope even for lo0 551 * so doesn't check out IFF_LOOPBACK. 552 */ 553 554 if (ro->ro_rt) { 555 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); 556 if (ia6 == 0) /* xxx scope error ?*/ 557 ia6 = ifatoia6(ro->ro_rt->rt_ifa); 558 } 559 if (ia6 == 0) { 560 *errorp = EHOSTUNREACH; /* no route */ 561 return(0); 562 } 563 return(&satosin6(&ia6->ia_addr)->sin6_addr); 564 } 565 566 *errorp = EADDRNOTAVAIL; 567 return(0); 568 } 569 570 /* 571 * Default hop limit selection. The precedence is as follows: 572 * 1. Hoplimit valued specified via ioctl. 573 * 2. (If the outgoing interface is detected) the current 574 * hop limit of the interface specified by router advertisement. 575 * 3. The system default hoplimit. 576 */ 577 int 578 in6_selecthlim(in6p, ifp) 579 struct in6pcb *in6p; 580 struct ifnet *ifp; 581 { 582 if (in6p && in6p->in6p_hops >= 0) 583 return(in6p->in6p_hops); 584 else if (ifp) 585 return(nd_ifinfo[ifp->if_index].chlim); 586 else 587 return(ip6_defhlim); 588 } 589 #endif 590 591 void 592 in6_pcbdisconnect(inp) 593 struct inpcb *inp; 594 { 595 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 596 inp->inp_fport = 0; 597 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 598 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 599 in_pcbrehash(inp); 600 if (inp->inp_socket->so_state & SS_NOFDREF) 601 in6_pcbdetach(inp); 602 } 603 604 void 605 in6_pcbdetach(inp) 606 struct inpcb *inp; 607 { 608 struct socket *so = inp->inp_socket; 609 struct inpcbinfo *ipi = inp->inp_pcbinfo; 610 611 #ifdef IPSEC 612 if (inp->in6p_sp != NULL) 613 ipsec6_delete_pcbpolicy(inp); 614 #endif /* IPSEC */ 615 inp->inp_gencnt = ++ipi->ipi_gencnt; 616 in_pcbremlists(inp); 617 sotoinpcb(so) = 0; 618 sotryfree(so); 619 620 if (inp->in6p_options) 621 m_freem(inp->in6p_options); 622 ip6_freepcbopts(inp->in6p_outputopts); 623 ip6_freemoptions(inp->in6p_moptions); 624 if (inp->in6p_route.ro_rt) 625 rtfree(inp->in6p_route.ro_rt); 626 /* Check and free IPv4 related resources in case of mapped addr */ 627 if (inp->inp_options) 628 (void)m_free(inp->inp_options); 629 ip_freemoptions(inp->inp_moptions); 630 631 inp->inp_vflag = 0; 632 INP_LOCK_DESTROY(inp); 633 uma_zfree(ipi->ipi_zone, inp); 634 } 635 636 struct sockaddr * 637 in6_sockaddr(port, addr_p) 638 in_port_t port; 639 struct in6_addr *addr_p; 640 { 641 struct sockaddr_in6 *sin6; 642 643 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 644 bzero(sin6, sizeof *sin6); 645 sin6->sin6_family = AF_INET6; 646 sin6->sin6_len = sizeof(*sin6); 647 sin6->sin6_port = port; 648 sin6->sin6_addr = *addr_p; 649 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 650 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 651 else 652 sin6->sin6_scope_id = 0; /*XXX*/ 653 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 654 sin6->sin6_addr.s6_addr16[1] = 0; 655 656 return (struct sockaddr *)sin6; 657 } 658 659 struct sockaddr * 660 in6_v4mapsin6_sockaddr(port, addr_p) 661 in_port_t port; 662 struct in_addr *addr_p; 663 { 664 struct sockaddr_in sin; 665 struct sockaddr_in6 *sin6_p; 666 667 bzero(&sin, sizeof sin); 668 sin.sin_family = AF_INET; 669 sin.sin_len = sizeof(sin); 670 sin.sin_port = port; 671 sin.sin_addr = *addr_p; 672 673 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 674 M_WAITOK); 675 in6_sin_2_v4mapsin6(&sin, sin6_p); 676 677 return (struct sockaddr *)sin6_p; 678 } 679 680 /* 681 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 682 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 683 * in struct pr_usrreqs, so that protocols can just reference then directly 684 * without the need for a wrapper function. The socket must have a valid 685 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 686 * except through a kernel programming error, so it is acceptable to panic 687 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 688 * because there actually /is/ a programming error somewhere... XXX) 689 */ 690 int 691 in6_setsockaddr(so, nam) 692 struct socket *so; 693 struct sockaddr **nam; 694 { 695 int s; 696 register struct inpcb *inp; 697 struct in6_addr addr; 698 in_port_t port; 699 700 s = splnet(); 701 inp = sotoinpcb(so); 702 if (!inp) { 703 splx(s); 704 return EINVAL; 705 } 706 port = inp->inp_lport; 707 addr = inp->in6p_laddr; 708 splx(s); 709 710 *nam = in6_sockaddr(port, &addr); 711 return 0; 712 } 713 714 int 715 in6_setpeeraddr(so, nam) 716 struct socket *so; 717 struct sockaddr **nam; 718 { 719 int s; 720 struct inpcb *inp; 721 struct in6_addr addr; 722 in_port_t port; 723 724 s = splnet(); 725 inp = sotoinpcb(so); 726 if (!inp) { 727 splx(s); 728 return EINVAL; 729 } 730 port = inp->inp_fport; 731 addr = inp->in6p_faddr; 732 splx(s); 733 734 *nam = in6_sockaddr(port, &addr); 735 return 0; 736 } 737 738 int 739 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 740 { 741 struct inpcb *inp = sotoinpcb(so); 742 int error; 743 744 if (inp == NULL) 745 return EINVAL; 746 if (inp->inp_vflag & INP_IPV4) { 747 error = in_setsockaddr(so, nam, &tcbinfo); 748 if (error == 0) 749 in6_sin_2_v4mapsin6_in_sock(nam); 750 } else 751 /* scope issues will be handled in in6_setsockaddr(). */ 752 error = in6_setsockaddr(so, nam); 753 754 return error; 755 } 756 757 int 758 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 759 { 760 struct inpcb *inp = sotoinpcb(so); 761 int error; 762 763 if (inp == NULL) 764 return EINVAL; 765 if (inp->inp_vflag & INP_IPV4) { 766 error = in_setpeeraddr(so, nam, &tcbinfo); 767 if (error == 0) 768 in6_sin_2_v4mapsin6_in_sock(nam); 769 } else 770 /* scope issues will be handled in in6_setpeeraddr(). */ 771 error = in6_setpeeraddr(so, nam); 772 773 return error; 774 } 775 776 /* 777 * Pass some notification to all connections of a protocol 778 * associated with address dst. The local address and/or port numbers 779 * may be specified to limit the search. The "usual action" will be 780 * taken, depending on the ctlinput cmd. The caller must filter any 781 * cmds that are uninteresting (e.g., no error in the map). 782 * Call the protocol specific routine (if any) to report 783 * any errors for each matching socket. 784 * 785 * Must be called at splnet. 786 */ 787 void 788 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify) 789 struct inpcbhead *head; 790 struct sockaddr *dst; 791 const struct sockaddr *src; 792 u_int fport_arg, lport_arg; 793 int cmd; 794 struct inpcb *(*notify) __P((struct inpcb *, int)); 795 { 796 struct inpcb *inp, *ninp; 797 struct sockaddr_in6 sa6_src, *sa6_dst; 798 u_short fport = fport_arg, lport = lport_arg; 799 u_int32_t flowinfo; 800 int errno, s; 801 802 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 803 return; 804 805 sa6_dst = (struct sockaddr_in6 *)dst; 806 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 807 return; 808 809 /* 810 * note that src can be NULL when we get notify by local fragmentation. 811 */ 812 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 813 flowinfo = sa6_src.sin6_flowinfo; 814 815 /* 816 * Redirects go to all references to the destination, 817 * and use in6_rtchange to invalidate the route cache. 818 * Dead host indications: also use in6_rtchange to invalidate 819 * the cache, and deliver the error to all the sockets. 820 * Otherwise, if we have knowledge of the local port and address, 821 * deliver only to that socket. 822 */ 823 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 824 fport = 0; 825 lport = 0; 826 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 827 828 if (cmd != PRC_HOSTDEAD) 829 notify = in6_rtchange; 830 } 831 errno = inet6ctlerrmap[cmd]; 832 s = splnet(); 833 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 834 ninp = LIST_NEXT(inp, inp_list); 835 836 if ((inp->inp_vflag & INP_IPV6) == 0) 837 continue; 838 839 /* 840 * Detect if we should notify the error. If no source and 841 * destination ports are specifed, but non-zero flowinfo and 842 * local address match, notify the error. This is the case 843 * when the error is delivered with an encrypted buffer 844 * by ESP. Otherwise, just compare addresses and ports 845 * as usual. 846 */ 847 if (lport == 0 && fport == 0 && flowinfo && 848 inp->inp_socket != NULL && 849 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 850 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 851 goto do_notify; 852 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 853 &sa6_dst->sin6_addr) || 854 inp->inp_socket == 0 || 855 (lport && inp->inp_lport != lport) || 856 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 857 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 858 &sa6_src.sin6_addr)) || 859 (fport && inp->inp_fport != fport)) 860 continue; 861 862 do_notify: 863 if (notify) 864 (*notify)(inp, errno); 865 } 866 splx(s); 867 } 868 869 /* 870 * Lookup a PCB based on the local address and port. 871 */ 872 struct inpcb * 873 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 874 struct inpcbinfo *pcbinfo; 875 struct in6_addr *laddr; 876 u_int lport_arg; 877 int wild_okay; 878 { 879 register struct inpcb *inp; 880 int matchwild = 3, wildcard; 881 u_short lport = lport_arg; 882 883 if (!wild_okay) { 884 struct inpcbhead *head; 885 /* 886 * Look for an unconnected (wildcard foreign addr) PCB that 887 * matches the local address and port we're looking for. 888 */ 889 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 890 pcbinfo->hashmask)]; 891 LIST_FOREACH(inp, head, inp_hash) { 892 if ((inp->inp_vflag & INP_IPV6) == 0) 893 continue; 894 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 895 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 896 inp->inp_lport == lport) { 897 /* 898 * Found. 899 */ 900 return (inp); 901 } 902 } 903 /* 904 * Not found. 905 */ 906 return (NULL); 907 } else { 908 struct inpcbporthead *porthash; 909 struct inpcbport *phd; 910 struct inpcb *match = NULL; 911 /* 912 * Best fit PCB lookup. 913 * 914 * First see if this local port is in use by looking on the 915 * port hash list. 916 */ 917 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 918 pcbinfo->porthashmask)]; 919 LIST_FOREACH(phd, porthash, phd_hash) { 920 if (phd->phd_port == lport) 921 break; 922 } 923 if (phd != NULL) { 924 /* 925 * Port is in use by one or more PCBs. Look for best 926 * fit. 927 */ 928 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 929 wildcard = 0; 930 if ((inp->inp_vflag & INP_IPV6) == 0) 931 continue; 932 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 933 wildcard++; 934 if (!IN6_IS_ADDR_UNSPECIFIED( 935 &inp->in6p_laddr)) { 936 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 937 wildcard++; 938 else if (!IN6_ARE_ADDR_EQUAL( 939 &inp->in6p_laddr, laddr)) 940 continue; 941 } else { 942 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 943 wildcard++; 944 } 945 if (wildcard < matchwild) { 946 match = inp; 947 matchwild = wildcard; 948 if (matchwild == 0) { 949 break; 950 } 951 } 952 } 953 } 954 return (match); 955 } 956 } 957 958 void 959 in6_pcbpurgeif0(head, ifp) 960 struct in6pcb *head; 961 struct ifnet *ifp; 962 { 963 struct in6pcb *in6p; 964 struct ip6_moptions *im6o; 965 struct in6_multi_mship *imm, *nimm; 966 967 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 968 im6o = in6p->in6p_moptions; 969 if ((in6p->inp_vflag & INP_IPV6) && 970 im6o) { 971 /* 972 * Unselect the outgoing interface if it is being 973 * detached. 974 */ 975 if (im6o->im6o_multicast_ifp == ifp) 976 im6o->im6o_multicast_ifp = NULL; 977 978 /* 979 * Drop multicast group membership if we joined 980 * through the interface being detached. 981 * XXX controversial - is it really legal for kernel 982 * to force this? 983 */ 984 for (imm = im6o->im6o_memberships.lh_first; 985 imm != NULL; imm = nimm) { 986 nimm = imm->i6mm_chain.le_next; 987 if (imm->i6mm_maddr->in6m_ifp == ifp) { 988 LIST_REMOVE(imm, i6mm_chain); 989 in6_delmulti(imm->i6mm_maddr); 990 free(imm, M_IPMADDR); 991 } 992 } 993 } 994 } 995 } 996 997 /* 998 * Check for alternatives when higher level complains 999 * about service problems. For now, invalidate cached 1000 * routing information. If the route was created dynamically 1001 * (by a redirect), time to try a default gateway again. 1002 */ 1003 void 1004 in6_losing(in6p) 1005 struct inpcb *in6p; 1006 { 1007 struct rtentry *rt; 1008 struct rt_addrinfo info; 1009 1010 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 1011 bzero((caddr_t)&info, sizeof(info)); 1012 info.rti_flags = rt->rt_flags; 1013 info.rti_info[RTAX_DST] = rt_key(rt); 1014 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 1015 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 1016 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 1017 if (rt->rt_flags & RTF_DYNAMIC) 1018 (void)rtrequest1(RTM_DELETE, &info, NULL); 1019 in6p->in6p_route.ro_rt = NULL; 1020 rtfree(rt); 1021 /* 1022 * A new route can be allocated 1023 * the next time output is attempted. 1024 */ 1025 } 1026 } 1027 1028 /* 1029 * After a routing change, flush old routing 1030 * and allocate a (hopefully) better one. 1031 */ 1032 struct inpcb * 1033 in6_rtchange(inp, errno) 1034 struct inpcb *inp; 1035 int errno; 1036 { 1037 if (inp->in6p_route.ro_rt) { 1038 rtfree(inp->in6p_route.ro_rt); 1039 inp->in6p_route.ro_rt = 0; 1040 /* 1041 * A new route can be allocated the next time 1042 * output is attempted. 1043 */ 1044 } 1045 return inp; 1046 } 1047 1048 /* 1049 * Lookup PCB in hash list. 1050 */ 1051 struct inpcb * 1052 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 1053 struct inpcbinfo *pcbinfo; 1054 struct in6_addr *faddr, *laddr; 1055 u_int fport_arg, lport_arg; 1056 int wildcard; 1057 struct ifnet *ifp; 1058 { 1059 struct inpcbhead *head; 1060 register struct inpcb *inp; 1061 u_short fport = fport_arg, lport = lport_arg; 1062 int faith; 1063 1064 if (faithprefix_p != NULL) 1065 faith = (*faithprefix_p)(laddr); 1066 else 1067 faith = 0; 1068 1069 /* 1070 * First look for an exact match. 1071 */ 1072 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 1073 lport, fport, 1074 pcbinfo->hashmask)]; 1075 LIST_FOREACH(inp, head, inp_hash) { 1076 if ((inp->inp_vflag & INP_IPV6) == 0) 1077 continue; 1078 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 1079 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 1080 inp->inp_fport == fport && 1081 inp->inp_lport == lport) { 1082 /* 1083 * Found. 1084 */ 1085 return (inp); 1086 } 1087 } 1088 if (wildcard) { 1089 struct inpcb *local_wild = NULL; 1090 1091 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 1092 pcbinfo->hashmask)]; 1093 LIST_FOREACH(inp, head, inp_hash) { 1094 if ((inp->inp_vflag & INP_IPV6) == 0) 1095 continue; 1096 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1097 inp->inp_lport == lport) { 1098 if (faith && (inp->inp_flags & INP_FAITH) == 0) 1099 continue; 1100 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 1101 laddr)) 1102 return (inp); 1103 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1104 local_wild = inp; 1105 } 1106 } 1107 return (local_wild); 1108 } 1109 1110 /* 1111 * Not found. 1112 */ 1113 return (NULL); 1114 } 1115 1116 void 1117 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 1118 { 1119 struct ip6_hdr *ip; 1120 1121 ip = mtod(m, struct ip6_hdr *); 1122 bzero(sin6, sizeof(*sin6)); 1123 sin6->sin6_len = sizeof(*sin6); 1124 sin6->sin6_family = AF_INET6; 1125 sin6->sin6_addr = ip->ip6_src; 1126 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1127 sin6->sin6_addr.s6_addr16[1] = 0; 1128 sin6->sin6_scope_id = 1129 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1130 ? m->m_pkthdr.rcvif->if_index : 0; 1131 1132 return; 1133 }
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