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