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sys/netinet6/in6_pcb.c
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1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1991, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 1. Redistributions of source code must retain the above copyright 40 * notice, this list of conditions and the following disclaimer. 41 * 2. Redistributions in binary form must reproduce the above copyright 42 * notice, this list of conditions and the following disclaimer in the 43 * documentation and/or other materials provided with the distribution. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 61 */ 62 63 #include <sys/cdefs.h> 64 __FBSDID("$FreeBSD: releng/8.1/sys/netinet6/in6_pcb.c 203060 2010-01-27 09:45:07Z bz $"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipsec.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/malloc.h> 73 #include <sys/mbuf.h> 74 #include <sys/domain.h> 75 #include <sys/protosw.h> 76 #include <sys/socket.h> 77 #include <sys/socketvar.h> 78 #include <sys/sockio.h> 79 #include <sys/errno.h> 80 #include <sys/time.h> 81 #include <sys/priv.h> 82 #include <sys/proc.h> 83 #include <sys/jail.h> 84 85 #include <vm/uma.h> 86 87 #include <net/if.h> 88 #include <net/if_types.h> 89 #include <net/route.h> 90 91 #include <netinet/in.h> 92 #include <netinet/in_var.h> 93 #include <netinet/in_systm.h> 94 #include <netinet/tcp_var.h> 95 #include <netinet/ip6.h> 96 #include <netinet/ip_var.h> 97 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/nd6.h> 100 #include <netinet/in_pcb.h> 101 #include <netinet6/in6_pcb.h> 102 #include <netinet6/scope6_var.h> 103 104 #include <security/mac/mac_framework.h> 105 106 struct in6_addr zeroin6_addr; 107 108 int 109 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam, 110 struct ucred *cred) 111 { 112 struct socket *so = inp->inp_socket; 113 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 114 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 115 u_short lport = 0; 116 int error, wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 117 118 INP_INFO_WLOCK_ASSERT(pcbinfo); 119 INP_WLOCK_ASSERT(inp); 120 121 if (TAILQ_EMPTY(&V_in6_ifaddrhead)) /* XXX broken! */ 122 return (EADDRNOTAVAIL); 123 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 124 return (EINVAL); 125 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 126 wild = INPLOOKUP_WILDCARD; 127 if (nam == NULL) { 128 if ((error = prison_local_ip6(cred, &inp->in6p_laddr, 129 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0) 130 return (error); 131 } else { 132 sin6 = (struct sockaddr_in6 *)nam; 133 if (nam->sa_len != sizeof(*sin6)) 134 return (EINVAL); 135 /* 136 * family check. 137 */ 138 if (nam->sa_family != AF_INET6) 139 return (EAFNOSUPPORT); 140 141 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 142 return(error); 143 144 if ((error = prison_local_ip6(cred, &sin6->sin6_addr, 145 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0) 146 return (error); 147 148 lport = sin6->sin6_port; 149 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 150 /* 151 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 152 * allow compepte duplication of binding if 153 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 154 * and a multicast address is bound on both 155 * new and duplicated sockets. 156 */ 157 if (so->so_options & SO_REUSEADDR) 158 reuseport = SO_REUSEADDR|SO_REUSEPORT; 159 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 160 struct ifaddr *ifa; 161 162 sin6->sin6_port = 0; /* yech... */ 163 if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) == 164 NULL && 165 (inp->inp_flags & INP_BINDANY) == 0) { 166 return (EADDRNOTAVAIL); 167 } 168 169 /* 170 * XXX: bind to an anycast address might accidentally 171 * cause sending a packet with anycast source address. 172 * We should allow to bind to a deprecated address, since 173 * the application dares to use it. 174 */ 175 if (ifa != NULL && 176 ((struct in6_ifaddr *)ifa)->ia6_flags & 177 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 178 ifa_free(ifa); 179 return (EADDRNOTAVAIL); 180 } 181 if (ifa != NULL) 182 ifa_free(ifa); 183 } 184 if (lport) { 185 struct inpcb *t; 186 187 /* GROSS */ 188 if (ntohs(lport) <= V_ipport_reservedhigh && 189 ntohs(lport) >= V_ipport_reservedlow && 190 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 191 0)) 192 return (EACCES); 193 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 194 priv_check_cred(inp->inp_cred, 195 PRIV_NETINET_REUSEPORT, 0) != 0) { 196 t = in6_pcblookup_local(pcbinfo, 197 &sin6->sin6_addr, lport, 198 INPLOOKUP_WILDCARD, cred); 199 if (t && 200 ((t->inp_flags & INP_TIMEWAIT) == 0) && 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 & SO_REUSEPORT) 206 == 0) && (inp->inp_cred->cr_uid != 207 t->inp_cred->cr_uid)) 208 return (EADDRINUSE); 209 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 210 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 211 struct sockaddr_in sin; 212 213 in6_sin6_2_sin(&sin, sin6); 214 t = in_pcblookup_local(pcbinfo, 215 sin.sin_addr, lport, 216 INPLOOKUP_WILDCARD, cred); 217 if (t && 218 ((t->inp_flags & 219 INP_TIMEWAIT) == 0) && 220 (so->so_type != SOCK_STREAM || 221 ntohl(t->inp_faddr.s_addr) == 222 INADDR_ANY) && 223 (inp->inp_cred->cr_uid != 224 t->inp_cred->cr_uid)) 225 return (EADDRINUSE); 226 } 227 } 228 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 229 lport, wild, cred); 230 if (t && (reuseport & ((t->inp_flags & INP_TIMEWAIT) ? 231 intotw(t)->tw_so_options : 232 t->inp_socket->so_options)) == 0) 233 return (EADDRINUSE); 234 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 235 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 236 struct sockaddr_in sin; 237 238 in6_sin6_2_sin(&sin, sin6); 239 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 240 lport, wild, cred); 241 if (t && t->inp_flags & INP_TIMEWAIT) { 242 if ((reuseport & 243 intotw(t)->tw_so_options) == 0 && 244 (ntohl(t->inp_laddr.s_addr) != 245 INADDR_ANY || ((inp->inp_vflag & 246 INP_IPV6PROTO) == 247 (t->inp_vflag & INP_IPV6PROTO)))) 248 return (EADDRINUSE); 249 } 250 else if (t && 251 (reuseport & t->inp_socket->so_options) 252 == 0 && (ntohl(t->inp_laddr.s_addr) != 253 INADDR_ANY || INP_SOCKAF(so) == 254 INP_SOCKAF(t->inp_socket))) 255 return (EADDRINUSE); 256 } 257 } 258 inp->in6p_laddr = sin6->sin6_addr; 259 } 260 if (lport == 0) { 261 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 262 return (error); 263 } else { 264 inp->inp_lport = lport; 265 if (in_pcbinshash(inp) != 0) { 266 inp->in6p_laddr = in6addr_any; 267 inp->inp_lport = 0; 268 return (EAGAIN); 269 } 270 } 271 return (0); 272 } 273 274 /* 275 * Transform old in6_pcbconnect() into an inner subroutine for new 276 * in6_pcbconnect(): Do some validity-checking on the remote 277 * address (in mbuf 'nam') and then determine local host address 278 * (i.e., which interface) to use to access that remote host. 279 * 280 * This preserves definition of in6_pcbconnect(), while supporting a 281 * slightly different version for T/TCP. (This is more than 282 * a bit of a kludge, but cleaning up the internal interfaces would 283 * have forced minor changes in every protocol). 284 */ 285 int 286 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam, 287 struct in6_addr *plocal_addr6) 288 { 289 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 290 int error = 0; 291 struct ifnet *ifp = NULL; 292 int scope_ambiguous = 0; 293 struct in6_addr in6a; 294 295 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 296 INP_WLOCK_ASSERT(inp); 297 298 if (nam->sa_len != sizeof (*sin6)) 299 return (EINVAL); 300 if (sin6->sin6_family != AF_INET6) 301 return (EAFNOSUPPORT); 302 if (sin6->sin6_port == 0) 303 return (EADDRNOTAVAIL); 304 305 if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone) 306 scope_ambiguous = 1; 307 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0) 308 return(error); 309 310 if (!TAILQ_EMPTY(&V_in6_ifaddrhead)) { 311 /* 312 * If the destination address is UNSPECIFIED addr, 313 * use the loopback addr, e.g ::1. 314 */ 315 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 316 sin6->sin6_addr = in6addr_loopback; 317 } 318 if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0) 319 return (error); 320 321 error = in6_selectsrc(sin6, inp->in6p_outputopts, 322 inp, NULL, inp->inp_cred, &ifp, &in6a); 323 if (error) 324 return (error); 325 326 if (ifp && scope_ambiguous && 327 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 328 return(error); 329 } 330 331 /* 332 * Do not update this earlier, in case we return with an error. 333 * 334 * XXX: this in6_selectsrc result might replace the bound local 335 * address with the address specified by setsockopt(IPV6_PKTINFO). 336 * Is it the intended behavior? 337 */ 338 *plocal_addr6 = in6a; 339 340 /* 341 * Don't do pcblookup call here; return interface in 342 * plocal_addr6 343 * and exit to caller, that will do the lookup. 344 */ 345 346 return (0); 347 } 348 349 /* 350 * Outer subroutine: 351 * Connect from a socket to a specified address. 352 * Both address and port must be specified in argument sin. 353 * If don't have a local address for this socket yet, 354 * then pick one. 355 */ 356 int 357 in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam, 358 struct ucred *cred) 359 { 360 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 361 struct in6_addr addr6; 362 int error; 363 364 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 365 INP_WLOCK_ASSERT(inp); 366 367 /* 368 * Call inner routine, to assign local interface address. 369 * in6_pcbladdr() may automatically fill in sin6_scope_id. 370 */ 371 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 372 return (error); 373 374 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 375 sin6->sin6_port, 376 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 377 ? &addr6 : &inp->in6p_laddr, 378 inp->inp_lport, 0, NULL) != NULL) { 379 return (EADDRINUSE); 380 } 381 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 382 if (inp->inp_lport == 0) { 383 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 384 if (error) 385 return (error); 386 } 387 inp->in6p_laddr = addr6; 388 } 389 inp->in6p_faddr = sin6->sin6_addr; 390 inp->inp_fport = sin6->sin6_port; 391 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 392 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 393 if (inp->inp_flags & IN6P_AUTOFLOWLABEL) 394 inp->inp_flow |= 395 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 396 397 in_pcbrehash(inp); 398 399 return (0); 400 } 401 402 void 403 in6_pcbdisconnect(struct inpcb *inp) 404 { 405 406 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 407 INP_WLOCK_ASSERT(inp); 408 409 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 410 inp->inp_fport = 0; 411 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 412 inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; 413 in_pcbrehash(inp); 414 } 415 416 struct sockaddr * 417 in6_sockaddr(in_port_t port, struct in6_addr *addr_p) 418 { 419 struct sockaddr_in6 *sin6; 420 421 sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK); 422 bzero(sin6, sizeof *sin6); 423 sin6->sin6_family = AF_INET6; 424 sin6->sin6_len = sizeof(*sin6); 425 sin6->sin6_port = port; 426 sin6->sin6_addr = *addr_p; 427 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 428 429 return (struct sockaddr *)sin6; 430 } 431 432 struct sockaddr * 433 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p) 434 { 435 struct sockaddr_in sin; 436 struct sockaddr_in6 *sin6_p; 437 438 bzero(&sin, sizeof sin); 439 sin.sin_family = AF_INET; 440 sin.sin_len = sizeof(sin); 441 sin.sin_port = port; 442 sin.sin_addr = *addr_p; 443 444 sin6_p = malloc(sizeof *sin6_p, M_SONAME, 445 M_WAITOK); 446 in6_sin_2_v4mapsin6(&sin, sin6_p); 447 448 return (struct sockaddr *)sin6_p; 449 } 450 451 int 452 in6_getsockaddr(struct socket *so, struct sockaddr **nam) 453 { 454 register struct inpcb *inp; 455 struct in6_addr addr; 456 in_port_t port; 457 458 inp = sotoinpcb(so); 459 KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL")); 460 461 INP_RLOCK(inp); 462 port = inp->inp_lport; 463 addr = inp->in6p_laddr; 464 INP_RUNLOCK(inp); 465 466 *nam = in6_sockaddr(port, &addr); 467 return 0; 468 } 469 470 int 471 in6_getpeeraddr(struct socket *so, struct sockaddr **nam) 472 { 473 struct inpcb *inp; 474 struct in6_addr addr; 475 in_port_t port; 476 477 inp = sotoinpcb(so); 478 KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL")); 479 480 INP_RLOCK(inp); 481 port = inp->inp_fport; 482 addr = inp->in6p_faddr; 483 INP_RUNLOCK(inp); 484 485 *nam = in6_sockaddr(port, &addr); 486 return 0; 487 } 488 489 int 490 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 491 { 492 struct inpcb *inp; 493 int error; 494 495 inp = sotoinpcb(so); 496 KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL")); 497 498 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 499 error = in_getsockaddr(so, nam); 500 if (error == 0) 501 in6_sin_2_v4mapsin6_in_sock(nam); 502 } else { 503 /* scope issues will be handled in in6_getsockaddr(). */ 504 error = in6_getsockaddr(so, nam); 505 } 506 507 return error; 508 } 509 510 int 511 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 512 { 513 struct inpcb *inp; 514 int error; 515 516 inp = sotoinpcb(so); 517 KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL")); 518 519 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 520 error = in_getpeeraddr(so, nam); 521 if (error == 0) 522 in6_sin_2_v4mapsin6_in_sock(nam); 523 } else 524 /* scope issues will be handled in in6_getpeeraddr(). */ 525 error = in6_getpeeraddr(so, nam); 526 527 return error; 528 } 529 530 /* 531 * Pass some notification to all connections of a protocol 532 * associated with address dst. The local address and/or port numbers 533 * may be specified to limit the search. The "usual action" will be 534 * taken, depending on the ctlinput cmd. The caller must filter any 535 * cmds that are uninteresting (e.g., no error in the map). 536 * Call the protocol specific routine (if any) to report 537 * any errors for each matching socket. 538 */ 539 void 540 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, 541 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, 542 int cmd, void *cmdarg, 543 struct inpcb *(*notify)(struct inpcb *, int)) 544 { 545 struct inpcb *inp, *inp_temp; 546 struct sockaddr_in6 sa6_src, *sa6_dst; 547 u_short fport = fport_arg, lport = lport_arg; 548 u_int32_t flowinfo; 549 int errno; 550 551 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 552 return; 553 554 sa6_dst = (struct sockaddr_in6 *)dst; 555 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 556 return; 557 558 /* 559 * note that src can be NULL when we get notify by local fragmentation. 560 */ 561 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 562 flowinfo = sa6_src.sin6_flowinfo; 563 564 /* 565 * Redirects go to all references to the destination, 566 * and use in6_rtchange to invalidate the route cache. 567 * Dead host indications: also use in6_rtchange to invalidate 568 * the cache, and deliver the error to all the sockets. 569 * Otherwise, if we have knowledge of the local port and address, 570 * deliver only to that socket. 571 */ 572 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 573 fport = 0; 574 lport = 0; 575 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 576 577 if (cmd != PRC_HOSTDEAD) 578 notify = in6_rtchange; 579 } 580 errno = inet6ctlerrmap[cmd]; 581 INP_INFO_WLOCK(pcbinfo); 582 LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) { 583 INP_WLOCK(inp); 584 if ((inp->inp_vflag & INP_IPV6) == 0) { 585 INP_WUNLOCK(inp); 586 continue; 587 } 588 589 /* 590 * If the error designates a new path MTU for a destination 591 * and the application (associated with this socket) wanted to 592 * know the value, notify. Note that we notify for all 593 * disconnected sockets if the corresponding application 594 * wanted. This is because some UDP applications keep sending 595 * sockets disconnected. 596 * XXX: should we avoid to notify the value to TCP sockets? 597 */ 598 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 599 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 600 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 601 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 602 (u_int32_t *)cmdarg); 603 } 604 605 /* 606 * Detect if we should notify the error. If no source and 607 * destination ports are specifed, but non-zero flowinfo and 608 * local address match, notify the error. This is the case 609 * when the error is delivered with an encrypted buffer 610 * by ESP. Otherwise, just compare addresses and ports 611 * as usual. 612 */ 613 if (lport == 0 && fport == 0 && flowinfo && 614 inp->inp_socket != NULL && 615 flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) && 616 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 617 goto do_notify; 618 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 619 &sa6_dst->sin6_addr) || 620 inp->inp_socket == 0 || 621 (lport && inp->inp_lport != lport) || 622 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 623 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 624 &sa6_src.sin6_addr)) || 625 (fport && inp->inp_fport != fport)) { 626 INP_WUNLOCK(inp); 627 continue; 628 } 629 630 do_notify: 631 if (notify) { 632 if ((*notify)(inp, errno)) 633 INP_WUNLOCK(inp); 634 } else 635 INP_WUNLOCK(inp); 636 } 637 INP_INFO_WUNLOCK(pcbinfo); 638 } 639 640 /* 641 * Lookup a PCB based on the local address and port. 642 */ 643 struct inpcb * 644 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, 645 u_short lport, int wild_okay, struct ucred *cred) 646 { 647 register struct inpcb *inp; 648 int matchwild = 3, wildcard; 649 650 INP_INFO_WLOCK_ASSERT(pcbinfo); 651 652 if (!wild_okay) { 653 struct inpcbhead *head; 654 /* 655 * Look for an unconnected (wildcard foreign addr) PCB that 656 * matches the local address and port we're looking for. 657 */ 658 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 659 0, pcbinfo->ipi_hashmask)]; 660 LIST_FOREACH(inp, head, inp_hash) { 661 /* XXX inp locking */ 662 if ((inp->inp_vflag & INP_IPV6) == 0) 663 continue; 664 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 665 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 666 inp->inp_lport == lport) { 667 /* Found. */ 668 if (cred == NULL || 669 prison_equal_ip6(cred->cr_prison, 670 inp->inp_cred->cr_prison)) 671 return (inp); 672 } 673 } 674 /* 675 * Not found. 676 */ 677 return (NULL); 678 } else { 679 struct inpcbporthead *porthash; 680 struct inpcbport *phd; 681 struct inpcb *match = NULL; 682 /* 683 * Best fit PCB lookup. 684 * 685 * First see if this local port is in use by looking on the 686 * port hash list. 687 */ 688 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, 689 pcbinfo->ipi_porthashmask)]; 690 LIST_FOREACH(phd, porthash, phd_hash) { 691 if (phd->phd_port == lport) 692 break; 693 } 694 if (phd != NULL) { 695 /* 696 * Port is in use by one or more PCBs. Look for best 697 * fit. 698 */ 699 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 700 wildcard = 0; 701 if (cred != NULL && 702 !prison_equal_ip6(cred->cr_prison, 703 inp->inp_cred->cr_prison)) 704 continue; 705 /* XXX inp locking */ 706 if ((inp->inp_vflag & INP_IPV6) == 0) 707 continue; 708 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 709 wildcard++; 710 if (!IN6_IS_ADDR_UNSPECIFIED( 711 &inp->in6p_laddr)) { 712 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 713 wildcard++; 714 else if (!IN6_ARE_ADDR_EQUAL( 715 &inp->in6p_laddr, laddr)) 716 continue; 717 } else { 718 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 719 wildcard++; 720 } 721 if (wildcard < matchwild) { 722 match = inp; 723 matchwild = wildcard; 724 if (matchwild == 0) 725 break; 726 } 727 } 728 } 729 return (match); 730 } 731 } 732 733 void 734 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp) 735 { 736 struct inpcb *in6p; 737 struct ip6_moptions *im6o; 738 int i, gap; 739 740 INP_INFO_RLOCK(pcbinfo); 741 LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) { 742 INP_WLOCK(in6p); 743 im6o = in6p->in6p_moptions; 744 if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) { 745 /* 746 * Unselect the outgoing ifp for multicast if it 747 * is being detached. 748 */ 749 if (im6o->im6o_multicast_ifp == ifp) 750 im6o->im6o_multicast_ifp = NULL; 751 /* 752 * Drop multicast group membership if we joined 753 * through the interface being detached. 754 */ 755 gap = 0; 756 for (i = 0; i < im6o->im6o_num_memberships; i++) { 757 if (im6o->im6o_membership[i]->in6m_ifp == 758 ifp) { 759 in6_mc_leave(im6o->im6o_membership[i], 760 NULL); 761 gap++; 762 } else if (gap != 0) { 763 im6o->im6o_membership[i - gap] = 764 im6o->im6o_membership[i]; 765 } 766 } 767 im6o->im6o_num_memberships -= gap; 768 } 769 INP_WUNLOCK(in6p); 770 } 771 INP_INFO_RUNLOCK(pcbinfo); 772 } 773 774 /* 775 * Check for alternatives when higher level complains 776 * about service problems. For now, invalidate cached 777 * routing information. If the route was created dynamically 778 * (by a redirect), time to try a default gateway again. 779 */ 780 void 781 in6_losing(struct inpcb *in6p) 782 { 783 784 /* 785 * We don't store route pointers in the routing table anymore 786 */ 787 return; 788 } 789 790 /* 791 * After a routing change, flush old routing 792 * and allocate a (hopefully) better one. 793 */ 794 struct inpcb * 795 in6_rtchange(struct inpcb *inp, int errno) 796 { 797 /* 798 * We don't store route pointers in the routing table anymore 799 */ 800 return inp; 801 } 802 803 /* 804 * Lookup PCB in hash list. 805 */ 806 struct inpcb * 807 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, 808 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, int wildcard, 809 struct ifnet *ifp) 810 { 811 struct inpcbhead *head; 812 struct inpcb *inp, *tmpinp; 813 u_short fport = fport_arg, lport = lport_arg; 814 int faith; 815 816 INP_INFO_LOCK_ASSERT(pcbinfo); 817 818 if (faithprefix_p != NULL) 819 faith = (*faithprefix_p)(laddr); 820 else 821 faith = 0; 822 823 /* 824 * First look for an exact match. 825 */ 826 tmpinp = NULL; 827 head = &pcbinfo->ipi_hashbase[ 828 INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, 829 pcbinfo->ipi_hashmask)]; 830 LIST_FOREACH(inp, head, inp_hash) { 831 /* XXX inp locking */ 832 if ((inp->inp_vflag & INP_IPV6) == 0) 833 continue; 834 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 835 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 836 inp->inp_fport == fport && 837 inp->inp_lport == lport) { 838 /* 839 * XXX We should be able to directly return 840 * the inp here, without any checks. 841 * Well unless both bound with SO_REUSEPORT? 842 */ 843 if (prison_flag(inp->inp_cred, PR_IP6)) 844 return (inp); 845 if (tmpinp == NULL) 846 tmpinp = inp; 847 } 848 } 849 if (tmpinp != NULL) 850 return (tmpinp); 851 852 /* 853 * Then look for a wildcard match, if requested. 854 */ 855 if (wildcard == INPLOOKUP_WILDCARD) { 856 struct inpcb *local_wild = NULL, *local_exact = NULL; 857 struct inpcb *jail_wild = NULL; 858 int injail; 859 860 /* 861 * Order of socket selection - we always prefer jails. 862 * 1. jailed, non-wild. 863 * 2. jailed, wild. 864 * 3. non-jailed, non-wild. 865 * 4. non-jailed, wild. 866 */ 867 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 868 0, pcbinfo->ipi_hashmask)]; 869 LIST_FOREACH(inp, head, inp_hash) { 870 /* XXX inp locking */ 871 if ((inp->inp_vflag & INP_IPV6) == 0) 872 continue; 873 874 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 875 inp->inp_lport != lport) { 876 continue; 877 } 878 879 /* XXX inp locking */ 880 if (faith && (inp->inp_flags & INP_FAITH) == 0) 881 continue; 882 883 injail = prison_flag(inp->inp_cred, PR_IP6); 884 if (injail) { 885 if (prison_check_ip6(inp->inp_cred, 886 laddr) != 0) 887 continue; 888 } else { 889 if (local_exact != NULL) 890 continue; 891 } 892 893 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) { 894 if (injail) 895 return (inp); 896 else 897 local_exact = inp; 898 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 899 if (injail) 900 jail_wild = inp; 901 else 902 local_wild = inp; 903 } 904 } /* LIST_FOREACH */ 905 906 if (jail_wild != NULL) 907 return (jail_wild); 908 if (local_exact != NULL) 909 return (local_exact); 910 if (local_wild != NULL) 911 return (local_wild); 912 } /* if (wildcard == INPLOOKUP_WILDCARD) */ 913 914 /* 915 * Not found. 916 */ 917 return (NULL); 918 } 919 920 void 921 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 922 { 923 struct ip6_hdr *ip; 924 925 ip = mtod(m, struct ip6_hdr *); 926 bzero(sin6, sizeof(*sin6)); 927 sin6->sin6_len = sizeof(*sin6); 928 sin6->sin6_family = AF_INET6; 929 sin6->sin6_addr = ip->ip6_src; 930 931 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 932 933 return; 934 }
Cache object: c200122fa63c34226786e23c48ce8f63
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