1 /* $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $ */ 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. Neither the name of the University nor the names of its contributors 47 * may be used to endorse or promote products derived from this software 48 * without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 60 * SUCH DAMAGE. 61 * 62 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 63 */ 64 65 #include "opt_inet.h" 66 #include "opt_inet6.h" 67 68 #include <sys/param.h> 69 #include <sys/systm.h> 70 #include <sys/malloc.h> 71 #include <sys/mbuf.h> 72 #include <sys/domain.h> 73 #include <sys/protosw.h> 74 #include <sys/socket.h> 75 #include <sys/socketvar.h> 76 #include <sys/sockio.h> 77 #include <sys/errno.h> 78 #include <sys/time.h> 79 #include <sys/proc.h> 80 #include <sys/priv.h> 81 #include <sys/jail.h> 82 83 #include <sys/msgport2.h> 84 85 #include <vm/vm_zone.h> 86 87 #include <net/if.h> 88 #include <net/if_types.h> 89 #include <net/route.h> 90 #include <net/netisr2.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/ip6.h> 96 #include <netinet/ip_var.h> 97 #include <netinet6/ip6_var.h> 98 #include <netinet6/nd6.h> 99 #include <netinet/in_pcb.h> 100 #include <netinet6/in6_pcb.h> 101 102 struct in6_addr zeroin6_addr; 103 104 int 105 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 106 { 107 struct socket *so = inp->inp_socket; 108 struct sockaddr_in6 jsin6; 109 int error; 110 111 if (!in6_ifaddr) /* XXX broken! */ 112 return (EADDRNOTAVAIL); 113 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 114 return (EINVAL); 115 116 if (nam) { 117 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 118 struct inpcbinfo *pcbinfo; 119 struct inpcbportinfo *portinfo; 120 struct inpcbporthead *porthash; 121 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 122 struct ucred *cred = NULL; 123 struct inpcb *t; 124 u_short lport, lport_ho; 125 126 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 127 wild = 1; 128 if (td->td_proc != NULL) 129 cred = td->td_proc->p_ucred; 130 131 if (nam->sa_len != sizeof(*sin6)) 132 return (EINVAL); 133 /* 134 * family check. 135 */ 136 if (nam->sa_family != AF_INET6) 137 return (EAFNOSUPPORT); 138 139 /* Reject v4-mapped address */ 140 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 141 return (EADDRNOTAVAIL); 142 143 if (!prison_replace_wildcards(td, nam)) 144 return (EINVAL); 145 146 /* KAME hack: embed scopeid */ 147 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 148 return (EINVAL); 149 /* this must be cleared for ifa_ifwithaddr() */ 150 sin6->sin6_scope_id = 0; 151 152 lport = sin6->sin6_port; 153 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 154 /* 155 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 156 * allow compepte duplication of binding if 157 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 158 * and a multicast address is bound on both 159 * new and duplicated sockets. 160 */ 161 if (so->so_options & SO_REUSEADDR) 162 reuseport = SO_REUSEADDR|SO_REUSEPORT; 163 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 164 struct ifaddr *ia = NULL; 165 166 sin6->sin6_port = 0; /* yech... */ 167 if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) { 168 sin6->sin6_addr = kin6addr_any; 169 return (EINVAL); 170 } 171 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL) 172 return (EADDRNOTAVAIL); 173 174 /* 175 * XXX: bind to an anycast address might accidentally 176 * cause sending a packet with anycast source address. 177 * We should allow to bind to a deprecated address, since 178 * the application dares to use it. 179 */ 180 if (ia && 181 ((struct in6_ifaddr *)ia)->ia6_flags & 182 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) 183 return (EADDRNOTAVAIL); 184 } 185 186 inp->in6p_laddr = sin6->sin6_addr; 187 188 if (lport == 0) 189 goto auto_select; 190 lport_ho = ntohs(lport); 191 192 /* GROSS */ 193 if (lport_ho < IPV6PORT_RESERVED && cred && 194 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0)) { 195 inp->in6p_laddr = kin6addr_any; 196 return (EACCES); 197 } 198 199 /* 200 * Locate the proper portinfo based on lport 201 */ 202 pcbinfo = inp->inp_pcbinfo; 203 portinfo = 204 &pcbinfo->portinfo[lport_ho % pcbinfo->portinfo_cnt]; 205 KKASSERT((lport_ho % pcbinfo->portinfo_cnt) == 206 portinfo->offset); 207 208 /* 209 * This has to be atomic. If the porthash is shared across 210 * multiple protocol threads (aka tcp) then the token must 211 * be held. 212 */ 213 porthash = in_pcbporthash_head(portinfo, lport); 214 GET_PORTHASH_TOKEN(porthash); 215 216 if (so->so_cred->cr_uid != 0 && 217 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 218 t = in6_pcblookup_local(porthash, &sin6->sin6_addr, 219 lport, INPLOOKUP_WILDCARD, 220 cred); 221 if (t && 222 (so->so_cred->cr_uid != 223 t->inp_socket->so_cred->cr_uid)) { 224 inp->in6p_laddr = kin6addr_any; 225 error = EADDRINUSE; 226 goto done; 227 } 228 } 229 if (cred && cred->cr_prison && 230 !prison_replace_wildcards(td, nam)) { 231 inp->in6p_laddr = kin6addr_any; 232 error = EADDRNOTAVAIL; 233 goto done; 234 } 235 t = in6_pcblookup_local(porthash, &sin6->sin6_addr, lport, 236 wild, cred); 237 if (t && (reuseport & t->inp_socket->so_options) == 0) { 238 inp->in6p_laddr = kin6addr_any; 239 error = EADDRINUSE; 240 goto done; 241 } 242 243 inp->inp_lport = lport; 244 in_pcbinsporthash(porthash, inp); 245 error = 0; 246 done: 247 REL_PORTHASH_TOKEN(porthash); 248 return (error); 249 } else { 250 auto_select: 251 jsin6.sin6_addr = inp->in6p_laddr; 252 jsin6.sin6_family = AF_INET6; 253 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) { 254 inp->in6p_laddr = kin6addr_any; 255 inp->inp_lport = 0; 256 return (EINVAL); 257 } 258 259 return in6_pcbsetlport(&inp->in6p_laddr, inp, td); 260 } 261 } 262 263 /* 264 * Transform old in6_pcbconnect() into an inner subroutine for new 265 * in6_pcbconnect(): Do some validity-checking on the remote 266 * address (in mbuf 'nam') and then determine local host address 267 * (i.e., which interface) to use to access that remote host. 268 * 269 * This preserves definition of in6_pcbconnect(), while supporting a 270 * slightly different version for T/TCP. (This is more than 271 * a bit of a kludge, but cleaning up the internal interfaces would 272 * have forced minor changes in every protocol). 273 */ 274 275 int 276 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam, 277 struct in6_addr **plocal_addr6, struct thread *td) 278 { 279 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 280 struct ifnet *ifp = NULL; 281 int error = 0; 282 283 if (nam->sa_len != sizeof (*sin6)) 284 return (EINVAL); 285 if (sin6->sin6_family != AF_INET6) 286 return (EAFNOSUPPORT); 287 if (sin6->sin6_port == 0) 288 return (EADDRNOTAVAIL); 289 290 /* KAME hack: embed scopeid */ 291 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 292 return EINVAL; 293 294 if (in6_ifaddr) { 295 /* 296 * If the destination address is UNSPECIFIED addr, 297 * use the loopback addr, e.g ::1. 298 */ 299 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 300 sin6->sin6_addr = kin6addr_loopback; 301 } 302 { 303 /* 304 * XXX: in6_selectsrc might replace the bound local address 305 * with the address specified by setsockopt(IPV6_PKTINFO). 306 * Is it the intended behavior? 307 */ 308 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 309 inp->in6p_moptions, 310 &inp->in6p_route, 311 &inp->in6p_laddr, &error, td); 312 if (*plocal_addr6 == NULL) { 313 if (error == 0) 314 error = EADDRNOTAVAIL; 315 return (error); 316 } 317 /* 318 * Don't do pcblookup call here; return interface in 319 * plocal_addr6 320 * and exit to caller, that will do the lookup. 321 */ 322 } 323 324 if (inp->in6p_route.ro_rt) 325 ifp = inp->in6p_route.ro_rt->rt_ifp; 326 327 return (0); 328 } 329 330 /* 331 * Outer subroutine: 332 * Connect from a socket to a specified address. 333 * Both address and port must be specified in argument sin. 334 * If don't have a local address for this socket yet, 335 * then pick one. 336 */ 337 int 338 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td) 339 { 340 struct in6_addr *addr6; 341 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 342 int error; 343 344 /* Reject v4-mapped address */ 345 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) 346 return EADDRNOTAVAIL; 347 348 /* 349 * Call inner routine, to assign local interface address. 350 * in6_pcbladdr() may automatically fill in sin6_scope_id. 351 */ 352 if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0) 353 return (error); 354 355 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 356 sin6->sin6_port, 357 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 358 ? addr6 : &inp->in6p_laddr, 359 inp->inp_lport, 0, NULL) != NULL) { 360 return (EADDRINUSE); 361 } 362 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 363 if (inp->inp_lport == 0) { 364 error = in6_pcbbind(inp, NULL, td); 365 if (error) 366 return (error); 367 } 368 inp->in6p_laddr = *addr6; 369 } 370 inp->in6p_faddr = sin6->sin6_addr; 371 inp->inp_fport = sin6->sin6_port; 372 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 373 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 374 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 375 inp->in6p_flowinfo |= 376 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 377 378 in_pcbinsconnhash(inp); 379 return (0); 380 } 381 382 void 383 in6_pcbdisconnect(struct inpcb *inp) 384 { 385 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 386 inp->inp_fport = 0; 387 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 388 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 389 in_pcbremconnhash(inp); 390 if (inp->inp_socket->so_state & SS_NOFDREF) 391 in6_pcbdetach(inp); 392 } 393 394 void 395 in6_pcbdetach(struct inpcb *inp) 396 { 397 struct socket *so = inp->inp_socket; 398 struct inpcbinfo *ipi = inp->inp_pcbinfo; 399 400 inp->inp_gencnt = ++ipi->ipi_gencnt; 401 in_pcbremlists(inp); 402 so->so_pcb = NULL; 403 KKASSERT((so->so_state & SS_ASSERTINPROG) == 0); 404 sofree(so); /* remove pcb ref */ 405 406 if (inp->in6p_options) 407 m_freem(inp->in6p_options); 408 ip6_freepcbopts(inp->in6p_outputopts); 409 ip6_freemoptions(inp->in6p_moptions); 410 if (inp->in6p_route.ro_rt) 411 rtfree(inp->in6p_route.ro_rt); 412 /* Check and free IPv4 related resources in case of mapped addr */ 413 if (inp->inp_options) 414 m_free(inp->inp_options); 415 ip_freemoptions(inp->inp_moptions); 416 417 kfree(inp, M_PCB); 418 } 419 420 /* 421 * The socket may have an invalid PCB, i.e. NULL. For example, a TCP 422 * socket received RST. 423 */ 424 static int 425 in6_setsockaddr(struct socket *so, struct sockaddr **nam) 426 { 427 struct inpcb *inp; 428 struct sockaddr_in6 *sin6; 429 430 KASSERT(curthread->td_type == TD_TYPE_NETISR, ("not in netisr")); 431 inp = so->so_pcb; 432 if (!inp) 433 return EINVAL; 434 435 sin6 = kmalloc(sizeof *sin6, M_SONAME, M_WAITOK | M_ZERO); 436 sin6->sin6_family = AF_INET6; 437 sin6->sin6_len = sizeof(*sin6); 438 sin6->sin6_port = inp->inp_lport; 439 sin6->sin6_addr = inp->in6p_laddr; 440 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 441 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 442 else 443 sin6->sin6_scope_id = 0; /*XXX*/ 444 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 445 sin6->sin6_addr.s6_addr16[1] = 0; 446 447 *nam = (struct sockaddr *)sin6; 448 return 0; 449 } 450 451 void 452 in6_setsockaddr_dispatch(netmsg_t msg) 453 { 454 int error; 455 456 error = in6_setsockaddr(msg->sockaddr.base.nm_so, msg->sockaddr.nm_nam); 457 lwkt_replymsg(&msg->sockaddr.base.lmsg, error); 458 } 459 460 void 461 in6_setpeeraddr_dispatch(netmsg_t msg) 462 { 463 int error; 464 465 error = in6_setpeeraddr(msg->peeraddr.base.nm_so, msg->peeraddr.nm_nam); 466 lwkt_replymsg(&msg->peeraddr.base.lmsg, error); 467 } 468 469 /* 470 * The socket may have an invalid PCB, i.e. NULL. For example, a TCP 471 * socket received RST. 472 */ 473 int 474 in6_setpeeraddr(struct socket *so, struct sockaddr **nam) 475 { 476 struct inpcb *inp; 477 struct sockaddr_in6 *sin6; 478 479 KASSERT(curthread->td_type == TD_TYPE_NETISR, ("not in netisr")); 480 inp = so->so_pcb; 481 if (!inp) 482 return EINVAL; 483 484 sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO); 485 sin6->sin6_family = AF_INET6; 486 sin6->sin6_len = sizeof(struct sockaddr_in6); 487 sin6->sin6_port = inp->inp_fport; 488 sin6->sin6_addr = inp->in6p_faddr; 489 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 490 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 491 else 492 sin6->sin6_scope_id = 0; /*XXX*/ 493 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 494 sin6->sin6_addr.s6_addr16[1] = 0; 495 496 *nam = (struct sockaddr *)sin6; 497 return 0; 498 } 499 500 /* 501 * Pass some notification to all connections of a protocol 502 * associated with address dst. The local address and/or port numbers 503 * may be specified to limit the search. The "usual action" will be 504 * taken, depending on the ctlinput cmd. The caller must filter any 505 * cmds that are uninteresting (e.g., no error in the map). 506 * Call the protocol specific routine (if any) to report 507 * any errors for each matching socket. 508 */ 509 void 510 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, in_port_t fport, 511 const struct sockaddr *src, in_port_t lport, int cmd, int arg, 512 inp_notify_t notify) 513 { 514 struct inpcb *inp, *marker; 515 struct sockaddr_in6 sa6_src, *sa6_dst; 516 u_int32_t flowinfo; 517 518 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 519 return; 520 521 sa6_dst = (struct sockaddr_in6 *)dst; 522 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 523 return; 524 525 /* 526 * note that src can be NULL when we get notify by local fragmentation. 527 */ 528 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 529 flowinfo = sa6_src.sin6_flowinfo; 530 531 /* 532 * Redirects go to all references to the destination, 533 * and use in6_rtchange to invalidate the route cache. 534 * Dead host indications: also use in6_rtchange to invalidate 535 * the cache, and deliver the error to all the sockets. 536 * Otherwise, if we have knowledge of the local port and address, 537 * deliver only to that socket. 538 */ 539 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 540 fport = 0; 541 lport = 0; 542 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 543 544 if (cmd != PRC_HOSTDEAD) 545 notify = in6_rtchange; 546 } 547 if (cmd != PRC_MSGSIZE) 548 arg = inet6ctlerrmap[cmd]; 549 550 marker = in_pcbmarker(); 551 552 GET_PCBINFO_TOKEN(pcbinfo); 553 554 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list); 555 while ((inp = LIST_NEXT(marker, inp_list)) != NULL) { 556 LIST_REMOVE(marker, inp_list); 557 LIST_INSERT_AFTER(inp, marker, inp_list); 558 559 if (inp->inp_flags & INP_PLACEMARKER) 560 continue; 561 562 if (!INP_ISIPV6(inp)) 563 continue; 564 /* 565 * If the error designates a new path MTU for a destination 566 * and the application (associated with this socket) wanted to 567 * know the value, notify. Note that we notify for all 568 * disconnected sockets if the corresponding application 569 * wanted. This is because some UDP applications keep sending 570 * sockets disconnected. 571 * XXX: should we avoid to notify the value to TCP sockets? 572 */ 573 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 574 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 575 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 576 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg); 577 } 578 579 /* 580 * Detect if we should notify the error. If no source and 581 * destination ports are specifed, but non-zero flowinfo and 582 * local address match, notify the error. This is the case 583 * when the error is delivered with an encrypted buffer 584 * by ESP. Otherwise, just compare addresses and ports 585 * as usual. 586 */ 587 if (lport == 0 && fport == 0 && flowinfo && 588 inp->inp_socket != NULL && 589 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 590 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 591 goto do_notify; 592 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 593 &sa6_dst->sin6_addr) || 594 inp->inp_socket == 0 || 595 (lport && inp->inp_lport != lport) || 596 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 597 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 598 &sa6_src.sin6_addr)) || 599 (fport && inp->inp_fport != fport)) 600 continue; 601 602 do_notify: 603 if (notify) 604 (*notify)(inp, arg); 605 } 606 LIST_REMOVE(marker, inp_list); 607 608 REL_PCBINFO_TOKEN(pcbinfo); 609 } 610 611 /* 612 * Lookup a PCB based on the local address and port. 613 */ 614 struct inpcb * 615 in6_pcblookup_local(struct inpcbporthead *porthash, 616 const struct in6_addr *laddr, u_int lport_arg, int wild_okay, 617 struct ucred *cred) 618 { 619 struct prison *pscan; 620 struct prison *pr; 621 struct inpcb *inp; 622 int matchwild = 3, wildcard; 623 u_short lport = lport_arg; 624 struct inpcbport *phd; 625 struct inpcb *match = NULL; 626 627 /* 628 * If the porthashbase is shared across several cpus, it must 629 * have been locked. 630 */ 631 ASSERT_PORTHASH_TOKEN_HELD(porthash); 632 633 /* 634 * Best fit PCB lookup. 635 * 636 * First see if this local port is in use by looking on the 637 * port hash list. 638 */ 639 LIST_FOREACH(phd, porthash, phd_hash) { 640 if (phd->phd_port == lport) 641 break; 642 } 643 644 if (phd != NULL) { 645 pr = cred ? cred->cr_prison : NULL; 646 647 /* 648 * Port is in use by one or more PCBs. Look for best 649 * fit. 650 */ 651 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 652 wildcard = 0; 653 if (!INP_ISIPV6(inp)) 654 continue; 655 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 656 wildcard++; 657 658 if (inp->inp_socket && inp->inp_socket->so_cred) 659 pscan = inp->inp_socket->so_cred->cr_prison; 660 else 661 pscan = NULL; 662 if (pr != pscan) 663 continue; 664 665 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 666 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 667 wildcard++; 668 } else { 669 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 670 wildcard++; 671 else if (!IN6_ARE_ADDR_EQUAL( 672 &inp->in6p_laddr, laddr)) 673 continue; 674 } 675 if (wildcard && !wild_okay) 676 continue; 677 if (wildcard < matchwild) { 678 match = inp; 679 matchwild = wildcard; 680 if (wildcard == 0) 681 break; 682 } 683 } 684 } 685 return (match); 686 } 687 688 void 689 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 690 { 691 struct in6pcb *in6p, *marker; 692 struct ip6_moptions *im6o; 693 struct in6_multi_mship *imm, *nimm; 694 695 /* 696 * We only need to make sure that we are in netisr0, where all 697 * multicast operation happen. We could check inpcbinfo which 698 * does not belong to netisr0 by holding the inpcbinfo's token. 699 * In this case, the pcbinfo must be able to be shared, i.e. 700 * pcbinfo->infotoken is not NULL. 701 */ 702 ASSERT_NETISR0; 703 KASSERT(pcbinfo->cpu == 0 || pcbinfo->infotoken != NULL, 704 ("pcbinfo could not be shared")); 705 706 /* 707 * Get a marker for the current netisr (netisr0). 708 * 709 * It is possible that the multicast address deletion blocks, 710 * which could cause temporary token releasing. So we use 711 * inpcb marker here to get a coherent view of the inpcb list. 712 * 713 * While, on the other hand, moptions are only added and deleted 714 * in netisr0, so we would not see staled moption or miss moption 715 * even if the token was released due to the blocking multicast 716 * address deletion. 717 */ 718 marker = in_pcbmarker(); 719 720 GET_PCBINFO_TOKEN(pcbinfo); 721 722 LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list); 723 while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) { 724 LIST_REMOVE(marker, inp_list); 725 LIST_INSERT_AFTER(in6p, marker, inp_list); 726 727 if (in6p->in6p_flags & INP_PLACEMARKER) 728 continue; 729 im6o = in6p->in6p_moptions; 730 if (INP_ISIPV6(in6p) && im6o) { 731 /* 732 * Unselect the outgoing interface if it is being 733 * detached. 734 */ 735 if (im6o->im6o_multicast_ifp == ifp) 736 im6o->im6o_multicast_ifp = NULL; 737 738 /* 739 * Drop multicast group membership if we joined 740 * through the interface being detached. 741 * XXX controversial - is it really legal for kernel 742 * to force this? 743 */ 744 for (imm = im6o->im6o_memberships.lh_first; 745 imm != NULL; imm = nimm) { 746 nimm = imm->i6mm_chain.le_next; 747 if (imm->i6mm_maddr->in6m_ifp == ifp) { 748 LIST_REMOVE(imm, i6mm_chain); 749 in6_delmulti(imm->i6mm_maddr); 750 kfree(imm, M_IPMADDR); 751 } 752 } 753 } 754 } 755 LIST_REMOVE(marker, inp_list); 756 757 REL_PCBINFO_TOKEN(pcbinfo); 758 } 759 760 /* 761 * Check for alternatives when higher level complains 762 * about service problems. For now, invalidate cached 763 * routing information. If the route was created dynamically 764 * (by a redirect), time to try a default gateway again. 765 */ 766 void 767 in6_losing(struct inpcb *in6p) 768 { 769 struct rtentry *rt; 770 struct rt_addrinfo info; 771 772 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 773 bzero((caddr_t)&info, sizeof(info)); 774 info.rti_flags = rt->rt_flags; 775 info.rti_info[RTAX_DST] = rt_key(rt); 776 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 777 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 778 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 779 if (rt->rt_flags & RTF_DYNAMIC) { 780 rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 781 rt_mask(rt), rt->rt_flags, NULL); 782 } 783 in6p->in6p_route.ro_rt = NULL; 784 rtfree(rt); 785 /* 786 * A new route can be allocated 787 * the next time output is attempted. 788 */ 789 } 790 } 791 792 /* 793 * After a routing change, flush old routing 794 * and allocate a (hopefully) better one. 795 */ 796 void 797 in6_rtchange(struct inpcb *inp, int error) 798 { 799 if (inp->in6p_route.ro_rt) { 800 rtfree(inp->in6p_route.ro_rt); 801 inp->in6p_route.ro_rt = 0; 802 /* 803 * A new route can be allocated the next time 804 * output is attempted. 805 */ 806 } 807 } 808 809 /* 810 * Lookup PCB in hash list. 811 */ 812 struct inpcb * 813 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 814 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, 815 int wildcard, struct ifnet *ifp) 816 { 817 struct inpcbhead *head; 818 struct inpcb *inp; 819 struct inpcb *jinp = NULL; 820 u_short fport = fport_arg, lport = lport_arg; 821 822 /* 823 * First look for an exact match. 824 */ 825 head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */, 826 fport, 827 laddr->s6_addr32[3], /* XXX JH */ 828 lport, 829 pcbinfo->hashmask)]; 830 LIST_FOREACH(inp, head, inp_hash) { 831 if (!INP_ISIPV6(inp)) 832 continue; 833 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 834 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 835 inp->inp_fport == fport && 836 inp->inp_lport == lport) { 837 /* 838 * Found. 839 */ 840 if (inp->inp_socket == NULL || 841 inp->inp_socket->so_cred->cr_prison == NULL) { 842 return (inp); 843 } 844 if (jinp == NULL) 845 jinp = inp; 846 } 847 } 848 if (jinp != NULL) 849 return(jinp); 850 851 if (wildcard) { 852 struct inpcb *local_wild = NULL; 853 struct inpcb *jinp_wild = NULL; 854 struct inpcontainer *ic; 855 struct inpcontainerhead *chead; 856 struct sockaddr_in6 jsin6; 857 struct ucred *cred; 858 struct prison *pr; 859 int net_listen_ov_local = 0; 860 int net_listen_ov_wild = 0; 861 862 /* 863 * Order of socket selection: 864 * 1. non-jailed, non-wild. 865 * 2. non-jailed, wild. (allow_listen_override on) 866 * 3. jailed, non-wild. 867 * 4. jailed, wild. 868 * 5. non-jailed, wild. (allow_listen_override off) 869 * 870 * NOTE: jailed wildcards are still restricted to the jail 871 * IPs. 872 * 873 * NOTE: (1) and (3) already handled above. 874 */ 875 jsin6.sin6_family = AF_INET6; 876 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport, 877 pcbinfo->wildcardhashmask)]; 878 879 GET_PCBINFO_TOKEN(pcbinfo); 880 LIST_FOREACH(ic, chead, ic_list) { 881 inp = ic->ic_inp; 882 if (inp->inp_flags & INP_PLACEMARKER) 883 continue; 884 885 /* 886 * Basdic validation 887 */ 888 if (!INP_ISIPV6(inp)) 889 continue; 890 if (inp->inp_lport != lport) 891 continue; 892 893 /* 894 * Calculate prison, setup jsin for jailed_ip() 895 * check. 896 */ 897 jsin6.sin6_addr = *laddr; 898 pr = NULL; 899 cred = NULL; 900 if (inp->inp_socket) { 901 cred = inp->inp_socket->so_cred; 902 if (cred) 903 pr = cred->cr_prison; 904 } 905 906 /* 907 * Assign jinp, jinp_wild, and local_wild as 908 * appropriate, track whether the jail supports 909 * listen overrides. 910 */ 911 if (pr) { 912 if (!jailed_ip(pr, (struct sockaddr *)&jsin6)) 913 continue; 914 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) 915 && jinp == NULL) { 916 jinp = inp; 917 if (PRISON_CAP_ISSET(pr->pr_caps, PRISON_CAP_NET_LISTEN_OVERRIDE)) 918 net_listen_ov_local = 1; 919 } 920 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 921 jinp_wild == NULL) { 922 jinp_wild = inp; 923 if (PRISON_CAP_ISSET(pr->pr_caps, PRISON_CAP_NET_LISTEN_OVERRIDE)) 924 net_listen_ov_wild = 1; 925 } 926 } else { 927 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) { 928 REL_PCBINFO_TOKEN(pcbinfo); 929 return (inp); 930 } 931 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 932 local_wild = inp; 933 } 934 } 935 REL_PCBINFO_TOKEN(pcbinfo); 936 937 if (net_listen_ov_local) 938 return jinp; 939 if (net_listen_ov_wild) 940 return jinp_wild; 941 if (local_wild) 942 return local_wild; 943 if (jinp) 944 return jinp; 945 return (jinp_wild); 946 } 947 948 /* 949 * Not found. 950 */ 951 return (NULL); 952 } 953 954 void 955 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 956 { 957 struct ip6_hdr *ip; 958 959 ip = mtod(m, struct ip6_hdr *); 960 bzero(sin6, sizeof(*sin6)); 961 sin6->sin6_len = sizeof(*sin6); 962 sin6->sin6_family = AF_INET6; 963 sin6->sin6_addr = ip->ip6_src; 964 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 965 sin6->sin6_addr.s6_addr16[1] = 0; 966 sin6->sin6_scope_id = 967 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 968 ? m->m_pkthdr.rcvif->if_index : 0; 969 970 return; 971 } 972 973 void 974 in6_savefaddr(struct socket *so, const struct sockaddr *faddr) 975 { 976 struct sockaddr_in6 *sin6; 977 978 KASSERT(faddr->sa_family == AF_INET6, 979 ("not AF_INET6 faddr %d", faddr->sa_family)); 980 981 sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO); 982 sin6->sin6_family = AF_INET6; 983 sin6->sin6_len = sizeof(*sin6); 984 985 sin6->sin6_port = ((const struct sockaddr_in6 *)faddr)->sin6_port; 986 sin6->sin6_addr = ((const struct sockaddr_in6 *)faddr)->sin6_addr; 987 988 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 989 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 990 else 991 sin6->sin6_scope_id = 0; /*XXX*/ 992 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 993 sin6->sin6_addr.s6_addr16[1] = 0; 994 995 so->so_faddr = (struct sockaddr *)sin6; 996 } 997