Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/netinet6/in6_pcb.c
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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 #ifdef FAST_IPSEC 116 #include <netipsec/ipsec.h> 117 #include <netipsec/ipsec6.h> 118 #include <netipsec/key.h> 119 #define IPSEC 120 #endif /* FAST_IPSEC */ 121 122 struct in6_addr zeroin6_addr; 123 124 int 125 in6_pcbbind(inp, nam, p) 126 register struct inpcb *inp; 127 struct sockaddr *nam; 128 struct proc *p; 129 { 130 struct socket *so = inp->inp_socket; 131 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 132 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 133 u_short lport = 0; 134 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 135 136 if (!in6_ifaddr) /* XXX broken! */ 137 return (EADDRNOTAVAIL); 138 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 139 return(EINVAL); 140 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 141 wild = 1; 142 if (nam) { 143 sin6 = (struct sockaddr_in6 *)nam; 144 if (nam->sa_len != sizeof(*sin6)) 145 return(EINVAL); 146 /* 147 * family check. 148 */ 149 if (nam->sa_family != AF_INET6) 150 return(EAFNOSUPPORT); 151 152 /* KAME hack: embed scopeid */ 153 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 154 return EINVAL; 155 /* this must be cleared for ifa_ifwithaddr() */ 156 sin6->sin6_scope_id = 0; 157 158 lport = sin6->sin6_port; 159 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 160 /* 161 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 162 * allow compepte duplication of binding if 163 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 164 * and a multicast address is bound on both 165 * new and duplicated sockets. 166 */ 167 if (so->so_options & SO_REUSEADDR) 168 reuseport = SO_REUSEADDR|SO_REUSEPORT; 169 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 170 struct ifaddr *ia = NULL; 171 172 sin6->sin6_port = 0; /* yech... */ 173 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 174 return(EADDRNOTAVAIL); 175 176 /* 177 * XXX: bind to an anycast address might accidentally 178 * cause sending a packet with anycast source address. 179 * We should allow to bind to a deprecated address, since 180 * the application dare to use it. 181 */ 182 if (ia && 183 ((struct in6_ifaddr *)ia)->ia6_flags & 184 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 185 return(EADDRNOTAVAIL); 186 } 187 } 188 if (lport) { 189 struct inpcb *t; 190 191 /* GROSS */ 192 if (ntohs(lport) < IPV6PORT_RESERVED && p && 193 suser_xxx(0, p, PRISON_ROOT)) 194 return(EACCES); 195 if (so->so_cred->cr_uid != 0 && 196 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 197 t = in6_pcblookup_local(pcbinfo, 198 &sin6->sin6_addr, lport, 199 INPLOOKUP_WILDCARD); 200 if (t && 201 (so->so_type != SOCK_STREAM || 202 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 203 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 204 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 205 (t->inp_socket->so_options & 206 SO_REUSEPORT) == 0) && 207 (so->so_cred->cr_uid != 208 t->inp_socket->so_cred->cr_uid)) 209 return (EADDRINUSE); 210 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 211 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 212 struct sockaddr_in sin; 213 214 in6_sin6_2_sin(&sin, sin6); 215 t = in_pcblookup_local(pcbinfo, 216 sin.sin_addr, lport, 217 INPLOOKUP_WILDCARD); 218 if (t && 219 (so->so_type != SOCK_STREAM || 220 ntohl(t->inp_faddr.s_addr) == 221 INADDR_ANY) && 222 (so->so_cred->cr_uid != 223 t->inp_socket->so_cred->cr_uid)) 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, p)) != 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, p) 344 register struct inpcb *inp; 345 struct sockaddr *nam; 346 struct proc *p; 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, p); 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(ifindex2ifnet[pi->ipi6_ifindex], 432 dst); 433 if (ia6 == 0) { 434 *errorp = EADDRNOTAVAIL; 435 return(0); 436 } 437 return(&satosin6(&ia6->ia_addr)->sin6_addr); 438 } 439 440 /* 441 * If the destination address is a link-local unicast address or 442 * a multicast address, and if the outgoing interface is specified 443 * by the sin6_scope_id filed, use an address associated with the 444 * interface. 445 * XXX: We're now trying to define more specific semantics of 446 * sin6_scope_id field, so this part will be rewritten in 447 * the near future. 448 */ 449 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && 450 dstsock->sin6_scope_id) { 451 /* 452 * I'm not sure if boundary check for scope_id is done 453 * somewhere... 454 */ 455 if (dstsock->sin6_scope_id < 0 || 456 if_index < dstsock->sin6_scope_id) { 457 *errorp = ENXIO; /* XXX: better error? */ 458 return(0); 459 } 460 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id], 461 dst); 462 if (ia6 == 0) { 463 *errorp = EADDRNOTAVAIL; 464 return(0); 465 } 466 return(&satosin6(&ia6->ia_addr)->sin6_addr); 467 } 468 469 /* 470 * If the destination address is a multicast address and 471 * the outgoing interface for the address is specified 472 * by the caller, use an address associated with the interface. 473 * There is a sanity check here; if the destination has node-local 474 * scope, the outgoing interfacde should be a loopback address. 475 * Even if the outgoing interface is not specified, we also 476 * choose a loopback interface as the outgoing interface. 477 */ 478 if (IN6_IS_ADDR_MULTICAST(dst)) { 479 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; 480 481 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { 482 ifp = &loif[0]; 483 } 484 485 if (ifp) { 486 ia6 = in6_ifawithscope(ifp, dst); 487 if (ia6 == 0) { 488 *errorp = EADDRNOTAVAIL; 489 return(0); 490 } 491 return(&ia6->ia_addr.sin6_addr); 492 } 493 } 494 495 /* 496 * If the next hop address for the packet is specified 497 * by caller, use an address associated with the route 498 * to the next hop. 499 */ 500 { 501 struct sockaddr_in6 *sin6_next; 502 struct rtentry *rt; 503 504 if (opts && opts->ip6po_nexthop) { 505 sin6_next = satosin6(opts->ip6po_nexthop); 506 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); 507 if (rt) { 508 ia6 = in6_ifawithscope(rt->rt_ifp, dst); 509 if (ia6 == 0) 510 ia6 = ifatoia6(rt->rt_ifa); 511 } 512 if (ia6 == 0) { 513 *errorp = EADDRNOTAVAIL; 514 return(0); 515 } 516 return(&satosin6(&ia6->ia_addr)->sin6_addr); 517 } 518 } 519 520 /* 521 * If route is known or can be allocated now, 522 * our src addr is taken from the i/f, else punt. 523 */ 524 if (ro) { 525 if (ro->ro_rt && 526 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { 527 RTFREE(ro->ro_rt); 528 ro->ro_rt = (struct rtentry *)0; 529 } 530 if (ro->ro_rt == (struct rtentry *)0 || 531 ro->ro_rt->rt_ifp == (struct ifnet *)0) { 532 struct sockaddr_in6 *dst6; 533 534 /* No route yet, so try to acquire one */ 535 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); 536 dst6 = (struct sockaddr_in6 *)&ro->ro_dst; 537 dst6->sin6_family = AF_INET6; 538 dst6->sin6_len = sizeof(struct sockaddr_in6); 539 dst6->sin6_addr = *dst; 540 if (IN6_IS_ADDR_MULTICAST(dst)) { 541 ro->ro_rt = rtalloc1(&((struct route *)ro) 542 ->ro_dst, 0, 0UL); 543 } else { 544 rtalloc((struct route *)ro); 545 } 546 } 547 548 /* 549 * in_pcbconnect() checks out IFF_LOOPBACK to skip using 550 * the address. But we don't know why it does so. 551 * It is necessary to ensure the scope even for lo0 552 * so doesn't check out IFF_LOOPBACK. 553 */ 554 555 if (ro->ro_rt) { 556 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); 557 if (ia6 == 0) /* xxx scope error ?*/ 558 ia6 = ifatoia6(ro->ro_rt->rt_ifa); 559 } 560 if (ia6 == 0) { 561 *errorp = EHOSTUNREACH; /* no route */ 562 return(0); 563 } 564 return(&satosin6(&ia6->ia_addr)->sin6_addr); 565 } 566 567 *errorp = EADDRNOTAVAIL; 568 return(0); 569 } 570 571 /* 572 * Default hop limit selection. The precedence is as follows: 573 * 1. Hoplimit valued specified via ioctl. 574 * 2. (If the outgoing interface is detected) the current 575 * hop limit of the interface specified by router advertisement. 576 * 3. The system default hoplimit. 577 */ 578 int 579 in6_selecthlim(in6p, ifp) 580 struct in6pcb *in6p; 581 struct ifnet *ifp; 582 { 583 if (in6p && in6p->in6p_hops >= 0) 584 return(in6p->in6p_hops); 585 else if (ifp) 586 return(nd_ifinfo[ifp->if_index].chlim); 587 else 588 return(ip6_defhlim); 589 } 590 #endif 591 592 void 593 in6_pcbdisconnect(inp) 594 struct inpcb *inp; 595 { 596 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 597 inp->inp_fport = 0; 598 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 599 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 600 in_pcbrehash(inp); 601 if (inp->inp_socket->so_state & SS_NOFDREF) 602 in6_pcbdetach(inp); 603 } 604 605 void 606 in6_pcbdetach(inp) 607 struct inpcb *inp; 608 { 609 struct socket *so = inp->inp_socket; 610 struct inpcbinfo *ipi = inp->inp_pcbinfo; 611 612 #ifdef IPSEC 613 if (inp->in6p_sp != NULL) 614 ipsec6_delete_pcbpolicy(inp); 615 #endif /* IPSEC */ 616 inp->inp_gencnt = ++ipi->ipi_gencnt; 617 in_pcbremlists(inp); 618 sotoinpcb(so) = 0; 619 sofree(so); 620 621 if (inp->in6p_options) 622 m_freem(inp->in6p_options); 623 ip6_freepcbopts(inp->in6p_outputopts); 624 ip6_freemoptions(inp->in6p_moptions); 625 if (inp->in6p_route.ro_rt) 626 rtfree(inp->in6p_route.ro_rt); 627 /* Check and free IPv4 related resources in case of mapped addr */ 628 if (inp->inp_options) 629 (void)m_free(inp->inp_options); 630 ip_freemoptions(inp->inp_moptions); 631 632 inp->inp_vflag = 0; 633 zfreei(ipi->ipi_zone, inp); 634 } 635 636 /* 637 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 638 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 639 * in struct pr_usrreqs, so that protocols can just reference then directly 640 * without the need for a wrapper function. The socket must have a valid 641 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 642 * except through a kernel programming error, so it is acceptable to panic 643 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 644 * because there actually /is/ a programming error somewhere... XXX) 645 */ 646 int 647 in6_setsockaddr(so, nam) 648 struct socket *so; 649 struct sockaddr **nam; 650 { 651 int s; 652 register struct inpcb *inp; 653 register struct sockaddr_in6 *sin6; 654 655 /* 656 * Do the malloc first in case it blocks. 657 */ 658 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 659 bzero(sin6, sizeof *sin6); 660 sin6->sin6_family = AF_INET6; 661 sin6->sin6_len = sizeof(*sin6); 662 663 s = splnet(); 664 inp = sotoinpcb(so); 665 if (!inp) { 666 splx(s); 667 free(sin6, M_SONAME); 668 return EINVAL; 669 } 670 sin6->sin6_port = inp->inp_lport; 671 sin6->sin6_addr = inp->in6p_laddr; 672 splx(s); 673 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 674 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 675 else 676 sin6->sin6_scope_id = 0; /*XXX*/ 677 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 678 sin6->sin6_addr.s6_addr16[1] = 0; 679 680 *nam = (struct sockaddr *)sin6; 681 return 0; 682 } 683 684 int 685 in6_setpeeraddr(so, nam) 686 struct socket *so; 687 struct sockaddr **nam; 688 { 689 int s; 690 struct inpcb *inp; 691 register struct sockaddr_in6 *sin6; 692 693 /* 694 * Do the malloc first in case it blocks. 695 */ 696 MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK); 697 bzero((caddr_t)sin6, sizeof (*sin6)); 698 sin6->sin6_family = AF_INET6; 699 sin6->sin6_len = sizeof(struct sockaddr_in6); 700 701 s = splnet(); 702 inp = sotoinpcb(so); 703 if (!inp) { 704 splx(s); 705 free(sin6, M_SONAME); 706 return EINVAL; 707 } 708 sin6->sin6_port = inp->inp_fport; 709 sin6->sin6_addr = inp->in6p_faddr; 710 splx(s); 711 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 712 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 713 else 714 sin6->sin6_scope_id = 0; /*XXX*/ 715 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 716 sin6->sin6_addr.s6_addr16[1] = 0; 717 718 *nam = (struct sockaddr *)sin6; 719 return 0; 720 } 721 722 int 723 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 724 { 725 struct inpcb *inp = sotoinpcb(so); 726 int error; 727 728 if (inp == NULL) 729 return EINVAL; 730 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 731 error = in_setsockaddr(so, nam); 732 if (error == 0) 733 in6_sin_2_v4mapsin6_in_sock(nam); 734 } else 735 /* scope issues will be handled in in6_setsockaddr(). */ 736 error = in6_setsockaddr(so, nam); 737 738 return error; 739 } 740 741 int 742 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 743 { 744 struct inpcb *inp = sotoinpcb(so); 745 int error; 746 747 if (inp == NULL) 748 return EINVAL; 749 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 750 error = in_setpeeraddr(so, nam); 751 if (error == 0) 752 in6_sin_2_v4mapsin6_in_sock(nam); 753 } else 754 /* scope issues will be handled in in6_setpeeraddr(). */ 755 error = in6_setpeeraddr(so, nam); 756 757 return error; 758 } 759 760 /* 761 * Pass some notification to all connections of a protocol 762 * associated with address dst. The local address and/or port numbers 763 * may be specified to limit the search. The "usual action" will be 764 * taken, depending on the ctlinput cmd. The caller must filter any 765 * cmds that are uninteresting (e.g., no error in the map). 766 * Call the protocol specific routine (if any) to report 767 * any errors for each matching socket. 768 * 769 * Must be called at splnet. 770 */ 771 void 772 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify) 773 struct inpcbhead *head; 774 struct sockaddr *dst, *src; 775 u_int fport_arg, lport_arg; 776 int cmd; 777 void (*notify) __P((struct inpcb *, int)); 778 { 779 struct inpcb *inp, *ninp; 780 struct sockaddr_in6 sa6_src, *sa6_dst; 781 u_short fport = fport_arg, lport = lport_arg; 782 u_int32_t flowinfo; 783 int errno, s; 784 785 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6) 786 return; 787 788 sa6_dst = (struct sockaddr_in6 *)dst; 789 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 790 return; 791 792 /* 793 * note that src can be NULL when we get notify by local fragmentation. 794 */ 795 sa6_src = (src == NULL) ? sa6_any : *(struct sockaddr_in6 *)src; 796 flowinfo = sa6_src.sin6_flowinfo; 797 798 /* 799 * Redirects go to all references to the destination, 800 * and use in6_rtchange to invalidate the route cache. 801 * Dead host indications: also use in6_rtchange to invalidate 802 * the cache, and deliver the error to all the sockets. 803 * Otherwise, if we have knowledge of the local port and address, 804 * deliver only to that socket. 805 */ 806 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 807 fport = 0; 808 lport = 0; 809 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 810 811 if (cmd != PRC_HOSTDEAD) 812 notify = in6_rtchange; 813 } 814 errno = inet6ctlerrmap[cmd]; 815 s = splnet(); 816 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 817 ninp = LIST_NEXT(inp, inp_list); 818 819 if ((inp->inp_vflag & INP_IPV6) == 0) 820 continue; 821 822 /* 823 * Detect if we should notify the error. If no source and 824 * destination ports are specifed, but non-zero flowinfo and 825 * local address match, notify the error. This is the case 826 * when the error is delivered with an encrypted buffer 827 * by ESP. Otherwise, just compare addresses and ports 828 * as usual. 829 */ 830 if (lport == 0 && fport == 0 && flowinfo && 831 inp->inp_socket != NULL && 832 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 833 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 834 goto do_notify; 835 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 836 &sa6_dst->sin6_addr) || 837 inp->inp_socket == 0 || 838 (lport && inp->inp_lport != lport) || 839 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 840 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 841 &sa6_src.sin6_addr)) || 842 (fport && inp->inp_fport != fport)) 843 continue; 844 845 do_notify: 846 if (notify) 847 (*notify)(inp, errno); 848 } 849 splx(s); 850 } 851 852 /* 853 * Lookup a PCB based on the local address and port. 854 */ 855 struct inpcb * 856 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 857 struct inpcbinfo *pcbinfo; 858 struct in6_addr *laddr; 859 u_int lport_arg; 860 int wild_okay; 861 { 862 register struct inpcb *inp; 863 int matchwild = 3, wildcard; 864 u_short lport = lport_arg; 865 866 if (!wild_okay) { 867 struct inpcbhead *head; 868 /* 869 * Look for an unconnected (wildcard foreign addr) PCB that 870 * matches the local address and port we're looking for. 871 */ 872 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 873 pcbinfo->hashmask)]; 874 LIST_FOREACH(inp, head, inp_hash) { 875 if ((inp->inp_vflag & INP_IPV6) == 0) 876 continue; 877 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 878 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 879 inp->inp_lport == lport) { 880 /* 881 * Found. 882 */ 883 return (inp); 884 } 885 } 886 /* 887 * Not found. 888 */ 889 return (NULL); 890 } else { 891 struct inpcbporthead *porthash; 892 struct inpcbport *phd; 893 struct inpcb *match = NULL; 894 /* 895 * Best fit PCB lookup. 896 * 897 * First see if this local port is in use by looking on the 898 * port hash list. 899 */ 900 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 901 pcbinfo->porthashmask)]; 902 LIST_FOREACH(phd, porthash, phd_hash) { 903 if (phd->phd_port == lport) 904 break; 905 } 906 if (phd != NULL) { 907 /* 908 * Port is in use by one or more PCBs. Look for best 909 * fit. 910 */ 911 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 912 wildcard = 0; 913 if ((inp->inp_vflag & INP_IPV6) == 0) 914 continue; 915 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 916 wildcard++; 917 if (!IN6_IS_ADDR_UNSPECIFIED( 918 &inp->in6p_laddr)) { 919 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 920 wildcard++; 921 else if (!IN6_ARE_ADDR_EQUAL( 922 &inp->in6p_laddr, laddr)) 923 continue; 924 } else { 925 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 926 wildcard++; 927 } 928 if (wildcard < matchwild) { 929 match = inp; 930 matchwild = wildcard; 931 if (matchwild == 0) { 932 break; 933 } 934 } 935 } 936 } 937 return (match); 938 } 939 } 940 941 void 942 in6_pcbpurgeif0(head, ifp) 943 struct in6pcb *head; 944 struct ifnet *ifp; 945 { 946 struct in6pcb *in6p; 947 struct ip6_moptions *im6o; 948 struct in6_multi_mship *imm, *nimm; 949 950 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 951 im6o = in6p->in6p_moptions; 952 if ((in6p->inp_vflag & INP_IPV6) && 953 im6o) { 954 /* 955 * Unselect the outgoing interface if it is being 956 * detached. 957 */ 958 if (im6o->im6o_multicast_ifp == ifp) 959 im6o->im6o_multicast_ifp = NULL; 960 961 /* 962 * Drop multicast group membership if we joined 963 * through the interface being detached. 964 * XXX controversial - is it really legal for kernel 965 * to force this? 966 */ 967 for (imm = im6o->im6o_memberships.lh_first; 968 imm != NULL; imm = nimm) { 969 nimm = imm->i6mm_chain.le_next; 970 if (imm->i6mm_maddr->in6m_ifp == ifp) { 971 LIST_REMOVE(imm, i6mm_chain); 972 in6_delmulti(imm->i6mm_maddr); 973 free(imm, M_IPMADDR); 974 } 975 } 976 } 977 } 978 } 979 980 /* 981 * Check for alternatives when higher level complains 982 * about service problems. For now, invalidate cached 983 * routing information. If the route was created dynamically 984 * (by a redirect), time to try a default gateway again. 985 */ 986 void 987 in6_losing(in6p) 988 struct inpcb *in6p; 989 { 990 struct rtentry *rt; 991 struct rt_addrinfo info; 992 993 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 994 bzero((caddr_t)&info, sizeof(info)); 995 info.rti_flags = rt->rt_flags; 996 info.rti_info[RTAX_DST] = rt_key(rt); 997 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 998 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 999 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 1000 if (rt->rt_flags & RTF_DYNAMIC) 1001 (void)rtrequest1(RTM_DELETE, &info, NULL); 1002 in6p->in6p_route.ro_rt = NULL; 1003 rtfree(rt); 1004 /* 1005 * A new route can be allocated 1006 * the next time output is attempted. 1007 */ 1008 } 1009 } 1010 1011 /* 1012 * After a routing change, flush old routing 1013 * and allocate a (hopefully) better one. 1014 */ 1015 void 1016 in6_rtchange(inp, errno) 1017 struct inpcb *inp; 1018 int errno; 1019 { 1020 if (inp->in6p_route.ro_rt) { 1021 rtfree(inp->in6p_route.ro_rt); 1022 inp->in6p_route.ro_rt = 0; 1023 /* 1024 * A new route can be allocated the next time 1025 * output is attempted. 1026 */ 1027 } 1028 } 1029 1030 /* 1031 * Lookup PCB in hash list. 1032 */ 1033 struct inpcb * 1034 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 1035 struct inpcbinfo *pcbinfo; 1036 struct in6_addr *faddr, *laddr; 1037 u_int fport_arg, lport_arg; 1038 int wildcard; 1039 struct ifnet *ifp; 1040 { 1041 struct inpcbhead *head; 1042 register struct inpcb *inp; 1043 u_short fport = fport_arg, lport = lport_arg; 1044 int faith; 1045 1046 if (faithprefix_p != NULL) 1047 faith = (*faithprefix_p)(laddr); 1048 else 1049 faith = 0; 1050 1051 /* 1052 * First look for an exact match. 1053 */ 1054 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 1055 lport, fport, 1056 pcbinfo->hashmask)]; 1057 LIST_FOREACH(inp, head, inp_hash) { 1058 if ((inp->inp_vflag & INP_IPV6) == 0) 1059 continue; 1060 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 1061 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 1062 inp->inp_fport == fport && 1063 inp->inp_lport == lport) { 1064 /* 1065 * Found. 1066 */ 1067 return (inp); 1068 } 1069 } 1070 if (wildcard) { 1071 struct inpcb *local_wild = NULL; 1072 1073 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 1074 pcbinfo->hashmask)]; 1075 LIST_FOREACH(inp, head, inp_hash) { 1076 if ((inp->inp_vflag & INP_IPV6) == 0) 1077 continue; 1078 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1079 inp->inp_lport == lport) { 1080 if (faith && (inp->inp_flags & INP_FAITH) == 0) 1081 continue; 1082 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 1083 laddr)) 1084 return (inp); 1085 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1086 local_wild = inp; 1087 } 1088 } 1089 return (local_wild); 1090 } 1091 1092 /* 1093 * Not found. 1094 */ 1095 return (NULL); 1096 } 1097 1098 void 1099 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 1100 { 1101 struct ip6_hdr *ip; 1102 1103 ip = mtod(m, struct ip6_hdr *); 1104 bzero(sin6, sizeof(*sin6)); 1105 sin6->sin6_len = sizeof(*sin6); 1106 sin6->sin6_family = AF_INET6; 1107 sin6->sin6_addr = ip->ip6_src; 1108 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1109 sin6->sin6_addr.s6_addr16[1] = 0; 1110 sin6->sin6_scope_id = 1111 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1112 ? m->m_pkthdr.rcvif->if_index : 0; 1113 1114 return; 1115 }
Cache object: c20107668ee6647b352e1e49c302e506
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