1 /* $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $ */ 2 /* $DragonFly: src/sys/netinet6/in6_pcb.c,v 1.28 2006/01/31 19:05:42 dillon Exp $ */ 3 /* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 */ 34 35 /* 36 * Copyright (c) 1982, 1986, 1991, 1993 37 * The Regents of the University of California. All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by the University of 50 * California, Berkeley and its contributors. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 68 */ 69 70 #include "opt_inet.h" 71 #include "opt_inet6.h" 72 #include "opt_ipsec.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/sockio.h> 83 #include <sys/errno.h> 84 #include <sys/time.h> 85 #include <sys/proc.h> 86 #include <sys/jail.h> 87 #include <sys/thread2.h> 88 89 #include <vm/vm_zone.h> 90 91 #include <net/if.h> 92 #include <net/if_types.h> 93 #include <net/route.h> 94 95 #include <netinet/in.h> 96 #include <netinet/in_var.h> 97 #include <netinet/in_systm.h> 98 #include <netinet/ip6.h> 99 #include <netinet/ip_var.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/nd6.h> 102 #include <netinet/in_pcb.h> 103 #include <netinet6/in6_pcb.h> 104 105 #ifdef IPSEC 106 #include <netinet6/ipsec.h> 107 #ifdef INET6 108 #include <netinet6/ipsec6.h> 109 #endif 110 #include <netinet6/ah.h> 111 #ifdef INET6 112 #include <netinet6/ah6.h> 113 #endif 114 #include <netproto/key/key.h> 115 #endif /* IPSEC */ 116 117 #ifdef FAST_IPSEC 118 #include <netproto/ipsec/ipsec.h> 119 #include <netproto/ipsec/ipsec6.h> 120 #include <netproto/ipsec/key.h> 121 #define IPSEC 122 #endif /* FAST_IPSEC */ 123 124 struct in6_addr zeroin6_addr; 125 126 int 127 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 128 { 129 struct socket *so = inp->inp_socket; 130 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 131 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 132 u_short lport = 0; 133 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 134 135 if (!in6_ifaddr) /* XXX broken! */ 136 return (EADDRNOTAVAIL); 137 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 138 return(EINVAL); 139 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 140 wild = 1; 141 if (nam) { 142 sin6 = (struct sockaddr_in6 *)nam; 143 if (nam->sa_len != sizeof(*sin6)) 144 return(EINVAL); 145 /* 146 * family check. 147 */ 148 if (nam->sa_family != AF_INET6) 149 return(EAFNOSUPPORT); 150 151 /* KAME hack: embed scopeid */ 152 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 153 return EINVAL; 154 /* this must be cleared for ifa_ifwithaddr() */ 155 sin6->sin6_scope_id = 0; 156 157 lport = sin6->sin6_port; 158 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 159 /* 160 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 161 * allow compepte duplication of binding if 162 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 163 * and a multicast address is bound on both 164 * new and duplicated sockets. 165 */ 166 if (so->so_options & SO_REUSEADDR) 167 reuseport = SO_REUSEADDR|SO_REUSEPORT; 168 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 169 struct ifaddr *ia = NULL; 170 171 sin6->sin6_port = 0; /* yech... */ 172 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 173 return(EADDRNOTAVAIL); 174 175 /* 176 * XXX: bind to an anycast address might accidentally 177 * cause sending a packet with anycast source address. 178 * We should allow to bind to a deprecated address, since 179 * the application dare to use it. 180 */ 181 if (ia && 182 ((struct in6_ifaddr *)ia)->ia6_flags & 183 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 184 return(EADDRNOTAVAIL); 185 } 186 } 187 if (lport) { 188 struct inpcb *t; 189 struct proc *p = td->td_proc; /* may be NULL */ 190 191 /* GROSS */ 192 if (ntohs(lport) < IPV6PORT_RESERVED && p && 193 suser_cred(p->p_ucred, 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 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 202 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 203 (t->inp_socket->so_options & 204 SO_REUSEPORT) == 0) && 205 (so->so_cred->cr_uid != 206 t->inp_socket->so_cred->cr_uid)) 207 return (EADDRINUSE); 208 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 209 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 210 struct sockaddr_in sin; 211 212 in6_sin6_2_sin(&sin, sin6); 213 t = in_pcblookup_local(pcbinfo, 214 sin.sin_addr, lport, 215 INPLOOKUP_WILDCARD); 216 if (t && 217 (so->so_cred->cr_uid != 218 t->inp_socket->so_cred->cr_uid) && 219 (ntohl(t->inp_laddr.s_addr) != 220 INADDR_ANY || 221 INP_SOCKAF(so) == 222 INP_SOCKAF(t->inp_socket))) 223 return (EADDRINUSE); 224 } 225 } 226 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 227 lport, wild); 228 if (t && (reuseport & t->inp_socket->so_options) == 0) 229 return(EADDRINUSE); 230 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 231 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 232 struct sockaddr_in sin; 233 234 in6_sin6_2_sin(&sin, sin6); 235 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 236 lport, wild); 237 if (t && 238 (reuseport & t->inp_socket->so_options) 239 == 0 && 240 (ntohl(t->inp_laddr.s_addr) 241 != INADDR_ANY || 242 INP_SOCKAF(so) == 243 INP_SOCKAF(t->inp_socket))) 244 return (EADDRINUSE); 245 } 246 } 247 inp->in6p_laddr = sin6->sin6_addr; 248 } 249 if (lport == 0) { 250 int e; 251 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0) 252 return(e); 253 } 254 else { 255 inp->inp_lport = lport; 256 if (in_pcbinsporthash(inp) != 0) { 257 inp->in6p_laddr = in6addr_any; 258 inp->inp_lport = 0; 259 return (EAGAIN); 260 } 261 } 262 return(0); 263 } 264 265 /* 266 * Transform old in6_pcbconnect() into an inner subroutine for new 267 * in6_pcbconnect(): Do some validity-checking on the remote 268 * address (in mbuf 'nam') and then determine local host address 269 * (i.e., which interface) to use to access that remote host. 270 * 271 * This preserves definition of in6_pcbconnect(), while supporting a 272 * slightly different version for T/TCP. (This is more than 273 * a bit of a kludge, but cleaning up the internal interfaces would 274 * have forced minor changes in every protocol). 275 */ 276 277 int 278 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam, 279 struct in6_addr **plocal_addr6) 280 { 281 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 282 struct ifnet *ifp = NULL; 283 int error = 0; 284 285 if (nam->sa_len != sizeof (*sin6)) 286 return (EINVAL); 287 if (sin6->sin6_family != AF_INET6) 288 return (EAFNOSUPPORT); 289 if (sin6->sin6_port == 0) 290 return (EADDRNOTAVAIL); 291 292 /* KAME hack: embed scopeid */ 293 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 294 return EINVAL; 295 296 if (in6_ifaddr) { 297 /* 298 * If the destination address is UNSPECIFIED addr, 299 * use the loopback addr, e.g ::1. 300 */ 301 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 302 sin6->sin6_addr = in6addr_loopback; 303 } 304 { 305 /* 306 * XXX: in6_selectsrc might replace the bound local address 307 * with the address specified by setsockopt(IPV6_PKTINFO). 308 * Is it the intended behavior? 309 */ 310 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 311 inp->in6p_moptions, 312 &inp->in6p_route, 313 &inp->in6p_laddr, &error); 314 if (*plocal_addr6 == 0) { 315 if (error == 0) 316 error = EADDRNOTAVAIL; 317 return(error); 318 } 319 /* 320 * Don't do pcblookup call here; return interface in 321 * plocal_addr6 322 * and exit to caller, that will do the lookup. 323 */ 324 } 325 326 if (inp->in6p_route.ro_rt) 327 ifp = inp->in6p_route.ro_rt->rt_ifp; 328 329 return(0); 330 } 331 332 /* 333 * Outer subroutine: 334 * Connect from a socket to a specified address. 335 * Both address and port must be specified in argument sin. 336 * If don't have a local address for this socket yet, 337 * then pick one. 338 */ 339 int 340 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 341 { 342 struct in6_addr *addr6; 343 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 344 int error; 345 346 /* 347 * Call inner routine, to assign local interface address. 348 * in6_pcbladdr() may automatically fill in sin6_scope_id. 349 */ 350 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 351 return(error); 352 353 if (in6_pcblookup_hash(inp->inp_cpcbinfo, &sin6->sin6_addr, 354 sin6->sin6_port, 355 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 356 ? addr6 : &inp->in6p_laddr, 357 inp->inp_lport, 0, NULL) != NULL) { 358 return (EADDRINUSE); 359 } 360 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 361 if (inp->inp_lport == 0) { 362 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 363 if (error) 364 return (error); 365 } 366 inp->in6p_laddr = *addr6; 367 } 368 inp->in6p_faddr = sin6->sin6_addr; 369 inp->inp_fport = sin6->sin6_port; 370 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 371 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 372 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 373 inp->in6p_flowinfo |= 374 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 375 376 in_pcbinsconnhash(inp); 377 return (0); 378 } 379 380 #if 0 381 /* 382 * Return an IPv6 address, which is the most appropriate for given 383 * destination and user specified options. 384 * If necessary, this function lookups the routing table and return 385 * an entry to the caller for later use. 386 */ 387 struct in6_addr * 388 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts, 389 struct ip6_moptions *mopts, struct route_in6 *ro, 390 struct in6_addr *laddr, int *errorp) 391 { 392 struct in6_addr *dst; 393 struct in6_ifaddr *ia6 = 0; 394 struct in6_pktinfo *pi = NULL; 395 396 dst = &dstsock->sin6_addr; 397 *errorp = 0; 398 399 /* 400 * If the source address is explicitly specified by the caller, 401 * use it. 402 */ 403 if (opts && (pi = opts->ip6po_pktinfo) && 404 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) 405 return(&pi->ipi6_addr); 406 407 /* 408 * If the source address is not specified but the socket(if any) 409 * is already bound, use the bound address. 410 */ 411 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) 412 return(laddr); 413 414 /* 415 * If the caller doesn't specify the source address but 416 * the outgoing interface, use an address associated with 417 * the interface. 418 */ 419 if (pi && pi->ipi6_ifindex) { 420 /* XXX boundary check is assumed to be already done. */ 421 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex], 422 dst); 423 if (ia6 == 0) { 424 *errorp = EADDRNOTAVAIL; 425 return(0); 426 } 427 return(&satosin6(&ia6->ia_addr)->sin6_addr); 428 } 429 430 /* 431 * If the destination address is a link-local unicast address or 432 * a multicast address, and if the outgoing interface is specified 433 * by the sin6_scope_id filed, use an address associated with the 434 * interface. 435 * XXX: We're now trying to define more specific semantics of 436 * sin6_scope_id field, so this part will be rewritten in 437 * the near future. 438 */ 439 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) && 440 dstsock->sin6_scope_id) { 441 /* 442 * I'm not sure if boundary check for scope_id is done 443 * somewhere... 444 */ 445 if (dstsock->sin6_scope_id < 0 || 446 if_index < dstsock->sin6_scope_id) { 447 *errorp = ENXIO; /* XXX: better error? */ 448 return(0); 449 } 450 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id], 451 dst); 452 if (ia6 == 0) { 453 *errorp = EADDRNOTAVAIL; 454 return(0); 455 } 456 return(&satosin6(&ia6->ia_addr)->sin6_addr); 457 } 458 459 /* 460 * If the destination address is a multicast address and 461 * the outgoing interface for the address is specified 462 * by the caller, use an address associated with the interface. 463 * There is a sanity check here; if the destination has node-local 464 * scope, the outgoing interfacde should be a loopback address. 465 * Even if the outgoing interface is not specified, we also 466 * choose a loopback interface as the outgoing interface. 467 */ 468 if (IN6_IS_ADDR_MULTICAST(dst)) { 469 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL; 470 471 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) { 472 ifp = &loif[0]; 473 } 474 475 if (ifp) { 476 ia6 = in6_ifawithscope(ifp, dst); 477 if (ia6 == 0) { 478 *errorp = EADDRNOTAVAIL; 479 return(0); 480 } 481 return(&ia6->ia_addr.sin6_addr); 482 } 483 } 484 485 /* 486 * If the next hop address for the packet is specified 487 * by caller, use an address associated with the route 488 * to the next hop. 489 */ 490 { 491 struct sockaddr_in6 *sin6_next; 492 struct rtentry *rt; 493 494 if (opts && opts->ip6po_nexthop) { 495 sin6_next = satosin6(opts->ip6po_nexthop); 496 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL); 497 if (rt) { 498 ia6 = in6_ifawithscope(rt->rt_ifp, dst); 499 if (ia6 == 0) 500 ia6 = ifatoia6(rt->rt_ifa); 501 } 502 if (ia6 == 0) { 503 *errorp = EADDRNOTAVAIL; 504 return(0); 505 } 506 return(&satosin6(&ia6->ia_addr)->sin6_addr); 507 } 508 } 509 510 /* 511 * If route is known or can be allocated now, 512 * our src addr is taken from the i/f, else punt. 513 */ 514 if (ro) { 515 if (ro->ro_rt && 516 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) { 517 RTFREE(ro->ro_rt); 518 ro->ro_rt = NULL; 519 } 520 if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) { 521 struct sockaddr_in6 *dst6; 522 523 /* No route yet, so try to acquire one */ 524 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6)); 525 dst6 = &ro->ro_dst; 526 dst6->sin6_family = AF_INET6; 527 dst6->sin6_len = sizeof(struct sockaddr_in6); 528 dst6->sin6_addr = *dst; 529 if (IN6_IS_ADDR_MULTICAST(dst)) { 530 ro->ro_rt = 531 rtpurelookup((struct sockaddr *)&ro->ro_dst); 532 } else { 533 rtalloc((struct route *)ro); 534 } 535 } 536 537 /* 538 * in_pcbconnect() checks out IFF_LOOPBACK to skip using 539 * the address. But we don't know why it does so. 540 * It is necessary to ensure the scope even for lo0 541 * so doesn't check out IFF_LOOPBACK. 542 */ 543 544 if (ro->ro_rt) { 545 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst); 546 if (ia6 == 0) /* xxx scope error ?*/ 547 ia6 = ifatoia6(ro->ro_rt->rt_ifa); 548 } 549 if (ia6 == 0) { 550 *errorp = EHOSTUNREACH; /* no route */ 551 return(0); 552 } 553 return(&satosin6(&ia6->ia_addr)->sin6_addr); 554 } 555 556 *errorp = EADDRNOTAVAIL; 557 return(0); 558 } 559 560 /* 561 * Default hop limit selection. The precedence is as follows: 562 * 1. Hoplimit valued specified via ioctl. 563 * 2. (If the outgoing interface is detected) the current 564 * hop limit of the interface specified by router advertisement. 565 * 3. The system default hoplimit. 566 */ 567 int 568 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp) 569 { 570 if (in6p && in6p->in6p_hops >= 0) 571 return(in6p->in6p_hops); 572 else if (ifp) 573 return(ND_IFINFO(ifp)->chlim); 574 else 575 return(ip6_defhlim); 576 } 577 #endif 578 579 void 580 in6_pcbdisconnect(struct inpcb *inp) 581 { 582 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 583 inp->inp_fport = 0; 584 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 585 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 586 in_pcbremconnhash(inp); 587 if (inp->inp_socket->so_state & SS_NOFDREF) 588 in6_pcbdetach(inp); 589 } 590 591 void 592 in6_pcbdetach(struct inpcb *inp) 593 { 594 struct socket *so = inp->inp_socket; 595 struct inpcbinfo *ipi = inp->inp_pcbinfo; 596 597 #ifdef IPSEC 598 if (inp->in6p_sp != NULL) 599 ipsec6_delete_pcbpolicy(inp); 600 #endif /* IPSEC */ 601 inp->inp_gencnt = ++ipi->ipi_gencnt; 602 in_pcbremlists(inp); 603 so->so_pcb = NULL; 604 sofree(so); 605 606 if (inp->in6p_options) 607 m_freem(inp->in6p_options); 608 ip6_freepcbopts(inp->in6p_outputopts); 609 ip6_freemoptions(inp->in6p_moptions); 610 if (inp->in6p_route.ro_rt) 611 rtfree(inp->in6p_route.ro_rt); 612 /* Check and free IPv4 related resources in case of mapped addr */ 613 if (inp->inp_options) 614 m_free(inp->inp_options); 615 ip_freemoptions(inp->inp_moptions); 616 617 inp->inp_vflag = 0; 618 zfree(ipi->ipi_zone, inp); 619 } 620 621 /* 622 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 623 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 624 * in struct pr_usrreqs, so that protocols can just reference then directly 625 * without the need for a wrapper function. The socket must have a valid 626 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 627 * except through a kernel programming error, so it is acceptable to panic 628 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 629 * because there actually /is/ a programming error somewhere... XXX) 630 */ 631 int 632 in6_setsockaddr(struct socket *so, struct sockaddr **nam) 633 { 634 struct inpcb *inp; 635 struct sockaddr_in6 *sin6; 636 637 /* 638 * Do the malloc first in case it blocks. 639 */ 640 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 641 bzero(sin6, sizeof *sin6); 642 sin6->sin6_family = AF_INET6; 643 sin6->sin6_len = sizeof(*sin6); 644 645 crit_enter(); 646 inp = so->so_pcb; 647 if (!inp) { 648 crit_exit(); 649 free(sin6, M_SONAME); 650 return EINVAL; 651 } 652 sin6->sin6_port = inp->inp_lport; 653 sin6->sin6_addr = inp->in6p_laddr; 654 crit_exit(); 655 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 656 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 657 else 658 sin6->sin6_scope_id = 0; /*XXX*/ 659 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 660 sin6->sin6_addr.s6_addr16[1] = 0; 661 662 *nam = (struct sockaddr *)sin6; 663 return 0; 664 } 665 666 int 667 in6_setpeeraddr(struct socket *so, struct sockaddr **nam) 668 { 669 struct inpcb *inp; 670 struct sockaddr_in6 *sin6; 671 672 /* 673 * Do the malloc first in case it blocks. 674 */ 675 MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK); 676 bzero((caddr_t)sin6, sizeof (*sin6)); 677 sin6->sin6_family = AF_INET6; 678 sin6->sin6_len = sizeof(struct sockaddr_in6); 679 680 crit_enter(); 681 inp = so->so_pcb; 682 if (!inp) { 683 crit_exit(); 684 free(sin6, M_SONAME); 685 return EINVAL; 686 } 687 sin6->sin6_port = inp->inp_fport; 688 sin6->sin6_addr = inp->in6p_faddr; 689 crit_exit(); 690 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 691 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 692 else 693 sin6->sin6_scope_id = 0; /*XXX*/ 694 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 695 sin6->sin6_addr.s6_addr16[1] = 0; 696 697 *nam = (struct sockaddr *)sin6; 698 return 0; 699 } 700 701 int 702 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 703 { 704 struct inpcb *inp = so->so_pcb; 705 int error; 706 707 if (inp == NULL) 708 return EINVAL; 709 if (inp->inp_vflag & INP_IPV4) { 710 error = in_setsockaddr(so, nam); 711 if (error == 0) 712 in6_sin_2_v4mapsin6_in_sock(nam); 713 } else 714 /* scope issues will be handled in in6_setsockaddr(). */ 715 error = in6_setsockaddr(so, nam); 716 717 return error; 718 } 719 720 int 721 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 722 { 723 struct inpcb *inp = so->so_pcb; 724 int error; 725 726 if (inp == NULL) 727 return EINVAL; 728 if (inp->inp_vflag & INP_IPV4) { 729 error = in_setpeeraddr(so, nam); 730 if (error == 0) 731 in6_sin_2_v4mapsin6_in_sock(nam); 732 } else 733 /* scope issues will be handled in in6_setpeeraddr(). */ 734 error = in6_setpeeraddr(so, nam); 735 736 return error; 737 } 738 739 /* 740 * Pass some notification to all connections of a protocol 741 * associated with address dst. The local address and/or port numbers 742 * may be specified to limit the search. The "usual action" will be 743 * taken, depending on the ctlinput cmd. The caller must filter any 744 * cmds that are uninteresting (e.g., no error in the map). 745 * Call the protocol specific routine (if any) to report 746 * any errors for each matching socket. 747 * 748 * Must be called under crit_enter(). 749 */ 750 void 751 in6_pcbnotify(struct inpcbhead *head, struct sockaddr *dst, in_port_t fport, 752 const struct sockaddr *src, in_port_t lport, int cmd, int arg, 753 void (*notify) (struct inpcb *, int)) 754 { 755 struct inpcb *inp, *ninp; 756 struct sockaddr_in6 sa6_src, *sa6_dst; 757 u_int32_t flowinfo; 758 759 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 760 return; 761 762 sa6_dst = (struct sockaddr_in6 *)dst; 763 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 764 return; 765 766 /* 767 * note that src can be NULL when we get notify by local fragmentation. 768 */ 769 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 770 flowinfo = sa6_src.sin6_flowinfo; 771 772 /* 773 * Redirects go to all references to the destination, 774 * and use in6_rtchange to invalidate the route cache. 775 * Dead host indications: also use in6_rtchange to invalidate 776 * the cache, and deliver the error to all the sockets. 777 * Otherwise, if we have knowledge of the local port and address, 778 * deliver only to that socket. 779 */ 780 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 781 fport = 0; 782 lport = 0; 783 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 784 785 if (cmd != PRC_HOSTDEAD) 786 notify = in6_rtchange; 787 } 788 if (cmd != PRC_MSGSIZE) 789 arg = inet6ctlerrmap[cmd]; 790 crit_enter(); 791 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 792 ninp = LIST_NEXT(inp, inp_list); 793 794 if (inp->inp_flags & INP_PLACEMARKER) 795 continue; 796 797 if ((inp->inp_vflag & INP_IPV6) == 0) 798 continue; 799 800 /* 801 * Detect if we should notify the error. If no source and 802 * destination ports are specifed, but non-zero flowinfo and 803 * local address match, notify the error. This is the case 804 * when the error is delivered with an encrypted buffer 805 * by ESP. Otherwise, just compare addresses and ports 806 * as usual. 807 */ 808 if (lport == 0 && fport == 0 && flowinfo && 809 inp->inp_socket != NULL && 810 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 811 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 812 goto do_notify; 813 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 814 &sa6_dst->sin6_addr) || 815 inp->inp_socket == 0 || 816 (lport && inp->inp_lport != lport) || 817 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 818 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 819 &sa6_src.sin6_addr)) || 820 (fport && inp->inp_fport != fport)) 821 continue; 822 823 do_notify: 824 if (notify) 825 (*notify)(inp, arg); 826 } 827 crit_exit(); 828 } 829 830 /* 831 * Lookup a PCB based on the local address and port. 832 */ 833 struct inpcb * 834 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 835 u_int lport_arg, int wild_okay) 836 { 837 struct inpcb *inp; 838 int matchwild = 3, wildcard; 839 u_short lport = lport_arg; 840 struct inpcbporthead *porthash; 841 struct inpcbport *phd; 842 struct inpcb *match = NULL; 843 844 /* 845 * Best fit PCB lookup. 846 * 847 * First see if this local port is in use by looking on the 848 * port hash list. 849 */ 850 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 851 pcbinfo->porthashmask)]; 852 LIST_FOREACH(phd, porthash, phd_hash) { 853 if (phd->phd_port == lport) 854 break; 855 } 856 if (phd != NULL) { 857 /* 858 * Port is in use by one or more PCBs. Look for best 859 * fit. 860 */ 861 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 862 wildcard = 0; 863 if ((inp->inp_vflag & INP_IPV6) == 0) 864 continue; 865 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 866 wildcard++; 867 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 868 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 869 wildcard++; 870 else if (!IN6_ARE_ADDR_EQUAL( 871 &inp->in6p_laddr, laddr)) 872 continue; 873 } else { 874 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 875 wildcard++; 876 } 877 if (wildcard && !wild_okay) 878 continue; 879 if (wildcard < matchwild) { 880 match = inp; 881 if (wildcard == 0) 882 break; 883 else 884 matchwild = wildcard; 885 } 886 } 887 } 888 return (match); 889 } 890 891 void 892 in6_pcbpurgeif0(struct in6pcb *head, struct ifnet *ifp) 893 { 894 struct in6pcb *in6p; 895 struct ip6_moptions *im6o; 896 struct in6_multi_mship *imm, *nimm; 897 898 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 899 if (in6p->in6p_flags & INP_PLACEMARKER) 900 continue; 901 im6o = in6p->in6p_moptions; 902 if ((in6p->inp_vflag & INP_IPV6) && 903 im6o) { 904 /* 905 * Unselect the outgoing interface if it is being 906 * detached. 907 */ 908 if (im6o->im6o_multicast_ifp == ifp) 909 im6o->im6o_multicast_ifp = NULL; 910 911 /* 912 * Drop multicast group membership if we joined 913 * through the interface being detached. 914 * XXX controversial - is it really legal for kernel 915 * to force this? 916 */ 917 for (imm = im6o->im6o_memberships.lh_first; 918 imm != NULL; imm = nimm) { 919 nimm = imm->i6mm_chain.le_next; 920 if (imm->i6mm_maddr->in6m_ifp == ifp) { 921 LIST_REMOVE(imm, i6mm_chain); 922 in6_delmulti(imm->i6mm_maddr); 923 free(imm, M_IPMADDR); 924 } 925 } 926 } 927 } 928 } 929 930 /* 931 * Check for alternatives when higher level complains 932 * about service problems. For now, invalidate cached 933 * routing information. If the route was created dynamically 934 * (by a redirect), time to try a default gateway again. 935 */ 936 void 937 in6_losing(struct inpcb *in6p) 938 { 939 struct rtentry *rt; 940 struct rt_addrinfo info; 941 942 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 943 bzero((caddr_t)&info, sizeof(info)); 944 info.rti_flags = rt->rt_flags; 945 info.rti_info[RTAX_DST] = rt_key(rt); 946 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 947 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 948 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 949 if (rt->rt_flags & RTF_DYNAMIC) 950 rtrequest1_global(RTM_DELETE, &info, NULL, NULL); 951 in6p->in6p_route.ro_rt = NULL; 952 rtfree(rt); 953 /* 954 * A new route can be allocated 955 * the next time output is attempted. 956 */ 957 } 958 } 959 960 /* 961 * After a routing change, flush old routing 962 * and allocate a (hopefully) better one. 963 */ 964 void 965 in6_rtchange(struct inpcb *inp, int errno) 966 { 967 if (inp->in6p_route.ro_rt) { 968 rtfree(inp->in6p_route.ro_rt); 969 inp->in6p_route.ro_rt = 0; 970 /* 971 * A new route can be allocated the next time 972 * output is attempted. 973 */ 974 } 975 } 976 977 /* 978 * Lookup PCB in hash list. 979 */ 980 struct inpcb * 981 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 982 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, 983 int wildcard, struct ifnet *ifp) 984 { 985 struct inpcbhead *head; 986 struct inpcb *inp; 987 u_short fport = fport_arg, lport = lport_arg; 988 int faith; 989 990 if (faithprefix_p != NULL) 991 faith = (*faithprefix_p)(laddr); 992 else 993 faith = 0; 994 995 /* 996 * First look for an exact match. 997 */ 998 head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */, 999 fport, 1000 laddr->s6_addr32[3], /* XXX JH */ 1001 lport, 1002 pcbinfo->hashmask)]; 1003 LIST_FOREACH(inp, head, inp_hash) { 1004 if ((inp->inp_vflag & INP_IPV6) == 0) 1005 continue; 1006 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 1007 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 1008 inp->inp_fport == fport && 1009 inp->inp_lport == lport) { 1010 /* 1011 * Found. 1012 */ 1013 return (inp); 1014 } 1015 } 1016 if (wildcard) { 1017 struct inpcontainerhead *chead; 1018 struct inpcontainer *ic; 1019 struct inpcb *local_wild = NULL; 1020 1021 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport, 1022 pcbinfo->wildcardhashmask)]; 1023 LIST_FOREACH(ic, chead, ic_list) { 1024 inp = ic->ic_inp; 1025 1026 if (!(inp->inp_vflag & INP_IPV6)) 1027 continue; 1028 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 1029 inp->inp_lport == lport) { 1030 if (faith && (inp->inp_flags & INP_FAITH) == 0) 1031 continue; 1032 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 1033 laddr)) 1034 return (inp); 1035 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 1036 local_wild = inp; 1037 } 1038 } 1039 return (local_wild); 1040 } 1041 1042 /* 1043 * Not found. 1044 */ 1045 return (NULL); 1046 } 1047 1048 void 1049 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 1050 { 1051 struct ip6_hdr *ip; 1052 1053 ip = mtod(m, struct ip6_hdr *); 1054 bzero(sin6, sizeof(*sin6)); 1055 sin6->sin6_len = sizeof(*sin6); 1056 sin6->sin6_family = AF_INET6; 1057 sin6->sin6_addr = ip->ip6_src; 1058 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1059 sin6->sin6_addr.s6_addr16[1] = 0; 1060 sin6->sin6_scope_id = 1061 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 1062 ? m->m_pkthdr.rcvif->if_index : 0; 1063 1064 return; 1065 } 1066