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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/6.4/sys/netinet6/in6_pcb.c 182649 2008-09-01 22:57:56Z obrien $"); 65 66 #include "opt_inet.h" 67 #include "opt_inet6.h" 68 #include "opt_ipsec.h" 69 #include "opt_mac.h" 70 71 #include <sys/param.h> 72 #include <sys/systm.h> 73 #include <sys/mac.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/domain.h> 77 #include <sys/protosw.h> 78 #include <sys/socket.h> 79 #include <sys/socketvar.h> 80 #include <sys/sockio.h> 81 #include <sys/errno.h> 82 #include <sys/time.h> 83 #include <sys/proc.h> 84 #include <sys/jail.h> 85 86 #include <vm/uma.h> 87 88 #include <net/if.h> 89 #include <net/if_types.h> 90 #include <net/route.h> 91 92 #include <netinet/in.h> 93 #include <netinet/in_var.h> 94 #include <netinet/in_systm.h> 95 #include <netinet/tcp_var.h> 96 #include <netinet/ip6.h> 97 #include <netinet/ip_var.h> 98 #include <netinet6/ip6_var.h> 99 #include <netinet6/nd6.h> 100 #include <netinet/in_pcb.h> 101 #include <netinet6/in6_pcb.h> 102 #include <netinet6/scope6_var.h> 103 104 #ifdef IPSEC 105 #include <netinet6/ipsec.h> 106 #ifdef INET6 107 #include <netinet6/ipsec6.h> 108 #endif 109 #include <netinet6/ah.h> 110 #ifdef INET6 111 #include <netinet6/ah6.h> 112 #endif 113 #include <netkey/key.h> 114 #endif /* IPSEC */ 115 116 #ifdef FAST_IPSEC 117 #include <netipsec/ipsec.h> 118 #include <netipsec/ipsec6.h> 119 #include <netipsec/key.h> 120 #endif /* FAST_IPSEC */ 121 122 struct in6_addr zeroin6_addr; 123 124 int 125 in6_pcbbind(inp, nam, cred) 126 register struct inpcb *inp; 127 struct sockaddr *nam; 128 struct ucred *cred; 129 { 130 struct socket *so = inp->inp_socket; 131 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 132 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 133 u_short lport = 0; 134 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 135 136 INP_INFO_WLOCK_ASSERT(pcbinfo); 137 INP_LOCK_ASSERT(inp); 138 139 if (!in6_ifaddr) /* XXX broken! */ 140 return (EADDRNOTAVAIL); 141 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 142 return (EINVAL); 143 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 144 wild = 1; 145 if (nam) { 146 int error; 147 148 sin6 = (struct sockaddr_in6 *)nam; 149 if (nam->sa_len != sizeof(*sin6)) 150 return (EINVAL); 151 /* 152 * family check. 153 */ 154 if (nam->sa_family != AF_INET6) 155 return (EAFNOSUPPORT); 156 157 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 158 return(error); 159 160 lport = sin6->sin6_port; 161 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 162 /* 163 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 164 * allow compepte duplication of binding if 165 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 166 * and a multicast address is bound on both 167 * new and duplicated sockets. 168 */ 169 if (so->so_options & SO_REUSEADDR) 170 reuseport = SO_REUSEADDR|SO_REUSEPORT; 171 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 172 struct ifaddr *ia = NULL; 173 174 sin6->sin6_port = 0; /* yech... */ 175 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 176 return (EADDRNOTAVAIL); 177 178 /* 179 * XXX: bind to an anycast address might accidentally 180 * cause sending a packet with anycast source address. 181 * We should allow to bind to a deprecated address, since 182 * the application dares to use it. 183 */ 184 if (ia && 185 ((struct in6_ifaddr *)ia)->ia6_flags & 186 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 187 return (EADDRNOTAVAIL); 188 } 189 } 190 if (lport) { 191 struct inpcb *t; 192 193 /* GROSS */ 194 if (ntohs(lport) <= ipport_reservedhigh && 195 ntohs(lport) >= ipport_reservedlow && 196 suser_cred(cred, SUSER_ALLOWJAIL)) 197 return (EACCES); 198 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 199 suser_cred(so->so_cred, SUSER_ALLOWJAIL) != 0) { 200 t = in6_pcblookup_local(pcbinfo, 201 &sin6->sin6_addr, lport, 202 INPLOOKUP_WILDCARD); 203 if (t && 204 ((t->inp_vflag & INP_TIMEWAIT) == 0) && 205 (so->so_type != SOCK_STREAM || 206 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 207 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 208 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 209 (t->inp_socket->so_options & SO_REUSEPORT) 210 == 0) && (so->so_cred->cr_uid != 211 t->inp_socket->so_cred->cr_uid)) 212 return (EADDRINUSE); 213 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 214 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 215 struct sockaddr_in sin; 216 217 in6_sin6_2_sin(&sin, sin6); 218 t = in_pcblookup_local(pcbinfo, 219 sin.sin_addr, lport, 220 INPLOOKUP_WILDCARD); 221 if (t && 222 ((t->inp_vflag & 223 INP_TIMEWAIT) == 0) && 224 (so->so_type != SOCK_STREAM || 225 ntohl(t->inp_faddr.s_addr) == 226 INADDR_ANY) && 227 (so->so_cred->cr_uid != 228 t->inp_socket->so_cred->cr_uid)) 229 return (EADDRINUSE); 230 } 231 } 232 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 233 lport, wild); 234 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 235 intotw(t)->tw_so_options : 236 t->inp_socket->so_options)) == 0) 237 return (EADDRINUSE); 238 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 239 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 240 struct sockaddr_in sin; 241 242 in6_sin6_2_sin(&sin, sin6); 243 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 244 lport, wild); 245 if (t && t->inp_vflag & INP_TIMEWAIT) { 246 if ((reuseport & 247 intotw(t)->tw_so_options) == 0 && 248 (ntohl(t->inp_laddr.s_addr) != 249 INADDR_ANY || ((inp->inp_vflag & 250 INP_IPV6PROTO) == 251 (t->inp_vflag & INP_IPV6PROTO)))) 252 return (EADDRINUSE); 253 } 254 else if (t && 255 (reuseport & t->inp_socket->so_options) 256 == 0 && (ntohl(t->inp_laddr.s_addr) != 257 INADDR_ANY || INP_SOCKAF(so) == 258 INP_SOCKAF(t->inp_socket))) 259 return (EADDRINUSE); 260 } 261 } 262 inp->in6p_laddr = sin6->sin6_addr; 263 } 264 if (lport == 0) { 265 int e; 266 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 267 return (e); 268 } 269 else { 270 inp->inp_lport = lport; 271 if (in_pcbinshash(inp) != 0) { 272 inp->in6p_laddr = in6addr_any; 273 inp->inp_lport = 0; 274 return (EAGAIN); 275 } 276 } 277 return (0); 278 } 279 280 /* 281 * Transform old in6_pcbconnect() into an inner subroutine for new 282 * in6_pcbconnect(): Do some validity-checking on the remote 283 * address (in mbuf 'nam') and then determine local host address 284 * (i.e., which interface) to use to access that remote host. 285 * 286 * This preserves definition of in6_pcbconnect(), while supporting a 287 * slightly different version for T/TCP. (This is more than 288 * a bit of a kludge, but cleaning up the internal interfaces would 289 * have forced minor changes in every protocol). 290 */ 291 292 int 293 in6_pcbladdr(inp, nam, plocal_addr6) 294 register struct inpcb *inp; 295 struct sockaddr *nam; 296 struct in6_addr **plocal_addr6; 297 { 298 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 299 int error = 0; 300 struct ifnet *ifp = NULL; 301 int scope_ambiguous = 0; 302 303 if (nam->sa_len != sizeof (*sin6)) 304 return (EINVAL); 305 if (sin6->sin6_family != AF_INET6) 306 return (EAFNOSUPPORT); 307 if (sin6->sin6_port == 0) 308 return (EADDRNOTAVAIL); 309 310 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 311 scope_ambiguous = 1; 312 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 313 return(error); 314 315 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 316 INP_LOCK_ASSERT(inp); 317 318 if (in6_ifaddr) { 319 /* 320 * If the destination address is UNSPECIFIED addr, 321 * use the loopback addr, e.g ::1. 322 */ 323 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 324 sin6->sin6_addr = in6addr_loopback; 325 } 326 327 /* 328 * XXX: in6_selectsrc might replace the bound local address 329 * with the address specified by setsockopt(IPV6_PKTINFO). 330 * Is it the intended behavior? 331 */ 332 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 333 inp->in6p_moptions, NULL, 334 &inp->in6p_laddr, &ifp, &error); 335 if (ifp && scope_ambiguous && 336 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 337 return(error); 338 } 339 340 if (*plocal_addr6 == 0) { 341 if (error == 0) 342 error = EADDRNOTAVAIL; 343 return (error); 344 } 345 /* 346 * Don't do pcblookup call here; return interface in 347 * plocal_addr6 348 * and exit to caller, that will do the lookup. 349 */ 350 351 return (0); 352 } 353 354 /* 355 * Outer subroutine: 356 * Connect from a socket to a specified address. 357 * Both address and port must be specified in argument sin. 358 * If don't have a local address for this socket yet, 359 * then pick one. 360 */ 361 int 362 in6_pcbconnect(inp, nam, cred) 363 register struct inpcb *inp; 364 struct sockaddr *nam; 365 struct ucred *cred; 366 { 367 struct in6_addr *addr6; 368 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 369 int error; 370 371 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 372 INP_LOCK_ASSERT(inp); 373 374 /* 375 * Call inner routine, to assign local interface address. 376 * in6_pcbladdr() may automatically fill in sin6_scope_id. 377 */ 378 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 379 return (error); 380 381 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 382 sin6->sin6_port, 383 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 384 ? addr6 : &inp->in6p_laddr, 385 inp->inp_lport, 0, NULL) != NULL) { 386 return (EADDRINUSE); 387 } 388 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 389 if (inp->inp_lport == 0) { 390 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 391 if (error) 392 return (error); 393 } 394 inp->in6p_laddr = *addr6; 395 } 396 inp->in6p_faddr = sin6->sin6_addr; 397 inp->inp_fport = sin6->sin6_port; 398 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 399 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 400 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 401 inp->in6p_flowinfo |= 402 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 403 404 in_pcbrehash(inp); 405 #ifdef IPSEC 406 if (inp->inp_socket->so_type == SOCK_STREAM) 407 ipsec_pcbconn(inp->inp_sp); 408 #endif 409 return (0); 410 } 411 412 void 413 in6_pcbdisconnect(inp) 414 struct inpcb *inp; 415 { 416 417 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 418 INP_LOCK_ASSERT(inp); 419 420 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 421 inp->inp_fport = 0; 422 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 423 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 424 in_pcbrehash(inp); 425 #ifdef IPSEC 426 ipsec_pcbdisconn(inp->inp_sp); 427 #endif 428 if (inp->inp_socket->so_state & SS_NOFDREF) 429 in6_pcbdetach(inp); 430 } 431 432 void 433 in6_pcbdetach(inp) 434 struct inpcb *inp; 435 { 436 struct socket *so = inp->inp_socket; 437 struct inpcbinfo *ipi = inp->inp_pcbinfo; 438 439 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 440 INP_LOCK_ASSERT(inp); 441 442 #if defined(IPSEC) || defined(FAST_IPSEC) 443 if (inp->in6p_sp != NULL) 444 ipsec6_delete_pcbpolicy(inp); 445 #endif /* IPSEC */ 446 inp->inp_gencnt = ++ipi->ipi_gencnt; 447 in_pcbremlists(inp); 448 449 if (so) { 450 ACCEPT_LOCK(); 451 SOCK_LOCK(so); 452 so->so_pcb = NULL; 453 sotryfree(so); 454 } 455 456 ip6_freepcbopts(inp->in6p_outputopts); 457 ip6_freemoptions(inp->in6p_moptions); 458 /* Check and free IPv4 related resources in case of mapped addr */ 459 if (inp->inp_options) 460 (void)m_free(inp->inp_options); 461 ip_freemoptions(inp->inp_moptions); 462 inp->inp_vflag = 0; 463 #ifdef MAC 464 mac_destroy_inpcb(inp); 465 #endif 466 INP_UNLOCK(inp); 467 uma_zfree(ipi->ipi_zone, inp); 468 } 469 470 struct sockaddr * 471 in6_sockaddr(port, addr_p) 472 in_port_t port; 473 struct in6_addr *addr_p; 474 { 475 struct sockaddr_in6 *sin6; 476 477 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 478 bzero(sin6, sizeof *sin6); 479 sin6->sin6_family = AF_INET6; 480 sin6->sin6_len = sizeof(*sin6); 481 sin6->sin6_port = port; 482 sin6->sin6_addr = *addr_p; 483 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 484 485 return (struct sockaddr *)sin6; 486 } 487 488 struct sockaddr * 489 in6_v4mapsin6_sockaddr(port, addr_p) 490 in_port_t port; 491 struct in_addr *addr_p; 492 { 493 struct sockaddr_in sin; 494 struct sockaddr_in6 *sin6_p; 495 496 bzero(&sin, sizeof sin); 497 sin.sin_family = AF_INET; 498 sin.sin_len = sizeof(sin); 499 sin.sin_port = port; 500 sin.sin_addr = *addr_p; 501 502 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 503 M_WAITOK); 504 in6_sin_2_v4mapsin6(&sin, sin6_p); 505 506 return (struct sockaddr *)sin6_p; 507 } 508 509 /* 510 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 511 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 512 * in struct pr_usrreqs, so that protocols can just reference then directly 513 * without the need for a wrapper function. The socket must have a valid 514 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 515 * except through a kernel programming error, so it is acceptable to panic 516 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 517 * because there actually /is/ a programming error somewhere... XXX) 518 */ 519 int 520 in6_setsockaddr(so, nam) 521 struct socket *so; 522 struct sockaddr **nam; 523 { 524 int s; 525 register struct inpcb *inp; 526 struct in6_addr addr; 527 in_port_t port; 528 529 s = splnet(); 530 inp = sotoinpcb(so); 531 if (!inp) { 532 splx(s); 533 return EINVAL; 534 } 535 port = inp->inp_lport; 536 addr = inp->in6p_laddr; 537 splx(s); 538 539 *nam = in6_sockaddr(port, &addr); 540 return 0; 541 } 542 543 int 544 in6_setpeeraddr(so, nam) 545 struct socket *so; 546 struct sockaddr **nam; 547 { 548 int s; 549 struct inpcb *inp; 550 struct in6_addr addr; 551 in_port_t port; 552 553 s = splnet(); 554 inp = sotoinpcb(so); 555 if (!inp) { 556 splx(s); 557 return EINVAL; 558 } 559 port = inp->inp_fport; 560 addr = inp->in6p_faddr; 561 splx(s); 562 563 *nam = in6_sockaddr(port, &addr); 564 return 0; 565 } 566 567 int 568 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 569 { 570 struct inpcb *inp = sotoinpcb(so); 571 int error; 572 573 if (inp == NULL) 574 return EINVAL; 575 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 576 error = in_setsockaddr(so, nam, &tcbinfo); 577 if (error == 0) 578 in6_sin_2_v4mapsin6_in_sock(nam); 579 } else { 580 /* scope issues will be handled in in6_setsockaddr(). */ 581 error = in6_setsockaddr(so, nam); 582 } 583 584 return error; 585 } 586 587 int 588 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 589 { 590 struct inpcb *inp = sotoinpcb(so); 591 int error; 592 593 if (inp == NULL) 594 return EINVAL; 595 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 596 error = in_setpeeraddr(so, nam, &tcbinfo); 597 if (error == 0) 598 in6_sin_2_v4mapsin6_in_sock(nam); 599 } else 600 /* scope issues will be handled in in6_setpeeraddr(). */ 601 error = in6_setpeeraddr(so, nam); 602 603 return error; 604 } 605 606 /* 607 * Pass some notification to all connections of a protocol 608 * associated with address dst. The local address and/or port numbers 609 * may be specified to limit the search. The "usual action" will be 610 * taken, depending on the ctlinput cmd. The caller must filter any 611 * cmds that are uninteresting (e.g., no error in the map). 612 * Call the protocol specific routine (if any) to report 613 * any errors for each matching socket. 614 * 615 * Must be called at splnet. 616 */ 617 void 618 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, 619 u_int fport_arg, const struct sockaddr *src, u_int lport_arg, 620 int cmd, void *cmdarg, struct inpcb *(*notify)(struct inpcb *, int)) 621 { 622 struct inpcbhead *head; 623 struct inpcb *inp, *ninp; 624 struct sockaddr_in6 sa6_src, *sa6_dst; 625 u_short fport = fport_arg, lport = lport_arg; 626 u_int32_t flowinfo; 627 int errno, s; 628 629 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 630 return; 631 632 sa6_dst = (struct sockaddr_in6 *)dst; 633 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 634 return; 635 636 /* 637 * note that src can be NULL when we get notify by local fragmentation. 638 */ 639 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 640 flowinfo = sa6_src.sin6_flowinfo; 641 642 /* 643 * Redirects go to all references to the destination, 644 * and use in6_rtchange to invalidate the route cache. 645 * Dead host indications: also use in6_rtchange to invalidate 646 * the cache, and deliver the error to all the sockets. 647 * Otherwise, if we have knowledge of the local port and address, 648 * deliver only to that socket. 649 */ 650 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 651 fport = 0; 652 lport = 0; 653 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 654 655 if (cmd != PRC_HOSTDEAD) 656 notify = in6_rtchange; 657 } 658 errno = inet6ctlerrmap[cmd]; 659 s = splnet(); 660 head = pcbinfo->listhead; 661 INP_INFO_WLOCK(pcbinfo); 662 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 663 INP_LOCK(inp); 664 ninp = LIST_NEXT(inp, inp_list); 665 666 if ((inp->inp_vflag & INP_IPV6) == 0) { 667 INP_UNLOCK(inp); 668 continue; 669 } 670 671 /* 672 * If the error designates a new path MTU for a destination 673 * and the application (associated with this socket) wanted to 674 * know the value, notify. Note that we notify for all 675 * disconnected sockets if the corresponding application 676 * wanted. This is because some UDP applications keep sending 677 * sockets disconnected. 678 * XXX: should we avoid to notify the value to TCP sockets? 679 */ 680 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 681 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 682 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 683 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 684 (u_int32_t *)cmdarg); 685 } 686 687 /* 688 * Detect if we should notify the error. If no source and 689 * destination ports are specifed, but non-zero flowinfo and 690 * local address match, notify the error. This is the case 691 * when the error is delivered with an encrypted buffer 692 * by ESP. Otherwise, just compare addresses and ports 693 * as usual. 694 */ 695 if (lport == 0 && fport == 0 && flowinfo && 696 inp->inp_socket != NULL && 697 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 698 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 699 goto do_notify; 700 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 701 &sa6_dst->sin6_addr) || 702 inp->inp_socket == 0 || 703 (lport && inp->inp_lport != lport) || 704 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 705 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 706 &sa6_src.sin6_addr)) || 707 (fport && inp->inp_fport != fport)) { 708 INP_UNLOCK(inp); 709 continue; 710 } 711 712 do_notify: 713 if (notify) { 714 if ((*notify)(inp, errno)) 715 INP_UNLOCK(inp); 716 } else 717 INP_UNLOCK(inp); 718 } 719 INP_INFO_WUNLOCK(pcbinfo); 720 splx(s); 721 } 722 723 /* 724 * Lookup a PCB based on the local address and port. 725 */ 726 struct inpcb * 727 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 728 struct inpcbinfo *pcbinfo; 729 struct in6_addr *laddr; 730 u_int lport_arg; 731 int wild_okay; 732 { 733 register struct inpcb *inp; 734 int matchwild = 3, wildcard; 735 u_short lport = lport_arg; 736 737 if (!wild_okay) { 738 struct inpcbhead *head; 739 /* 740 * Look for an unconnected (wildcard foreign addr) PCB that 741 * matches the local address and port we're looking for. 742 */ 743 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 744 pcbinfo->hashmask)]; 745 LIST_FOREACH(inp, head, inp_hash) { 746 if ((inp->inp_vflag & INP_IPV6) == 0) 747 continue; 748 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 749 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 750 inp->inp_lport == lport) { 751 /* 752 * Found. 753 */ 754 return (inp); 755 } 756 } 757 /* 758 * Not found. 759 */ 760 return (NULL); 761 } else { 762 struct inpcbporthead *porthash; 763 struct inpcbport *phd; 764 struct inpcb *match = NULL; 765 /* 766 * Best fit PCB lookup. 767 * 768 * First see if this local port is in use by looking on the 769 * port hash list. 770 */ 771 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 772 pcbinfo->porthashmask)]; 773 LIST_FOREACH(phd, porthash, phd_hash) { 774 if (phd->phd_port == lport) 775 break; 776 } 777 if (phd != NULL) { 778 /* 779 * Port is in use by one or more PCBs. Look for best 780 * fit. 781 */ 782 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 783 wildcard = 0; 784 if ((inp->inp_vflag & INP_IPV6) == 0) 785 continue; 786 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 787 wildcard++; 788 if (!IN6_IS_ADDR_UNSPECIFIED( 789 &inp->in6p_laddr)) { 790 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 791 wildcard++; 792 else if (!IN6_ARE_ADDR_EQUAL( 793 &inp->in6p_laddr, laddr)) 794 continue; 795 } else { 796 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 797 wildcard++; 798 } 799 if (wildcard < matchwild) { 800 match = inp; 801 matchwild = wildcard; 802 if (matchwild == 0) { 803 break; 804 } 805 } 806 } 807 } 808 return (match); 809 } 810 } 811 812 void 813 in6_pcbpurgeif0(head, ifp) 814 struct in6pcb *head; 815 struct ifnet *ifp; 816 { 817 struct in6pcb *in6p; 818 struct ip6_moptions *im6o; 819 struct in6_multi_mship *imm, *nimm; 820 821 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 822 im6o = in6p->in6p_moptions; 823 if ((in6p->inp_vflag & INP_IPV6) && 824 im6o) { 825 /* 826 * Unselect the outgoing interface if it is being 827 * detached. 828 */ 829 if (im6o->im6o_multicast_ifp == ifp) 830 im6o->im6o_multicast_ifp = NULL; 831 832 /* 833 * Drop multicast group membership if we joined 834 * through the interface being detached. 835 * XXX controversial - is it really legal for kernel 836 * to force this? 837 */ 838 for (imm = im6o->im6o_memberships.lh_first; 839 imm != NULL; imm = nimm) { 840 nimm = imm->i6mm_chain.le_next; 841 if (imm->i6mm_maddr->in6m_ifp == ifp) { 842 LIST_REMOVE(imm, i6mm_chain); 843 in6_delmulti(imm->i6mm_maddr); 844 free(imm, M_IP6MADDR); 845 } 846 } 847 } 848 } 849 } 850 851 /* 852 * Check for alternatives when higher level complains 853 * about service problems. For now, invalidate cached 854 * routing information. If the route was created dynamically 855 * (by a redirect), time to try a default gateway again. 856 */ 857 void 858 in6_losing(in6p) 859 struct inpcb *in6p; 860 { 861 /* 862 * We don't store route pointers in the routing table anymore 863 */ 864 return; 865 } 866 867 /* 868 * After a routing change, flush old routing 869 * and allocate a (hopefully) better one. 870 */ 871 struct inpcb * 872 in6_rtchange(inp, errno) 873 struct inpcb *inp; 874 int errno; 875 { 876 /* 877 * We don't store route pointers in the routing table anymore 878 */ 879 return inp; 880 } 881 882 /* 883 * Lookup PCB in hash list. 884 */ 885 struct inpcb * 886 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 887 struct inpcbinfo *pcbinfo; 888 struct in6_addr *faddr, *laddr; 889 u_int fport_arg, lport_arg; 890 int wildcard; 891 struct ifnet *ifp; 892 { 893 struct inpcbhead *head; 894 register struct inpcb *inp; 895 u_short fport = fport_arg, lport = lport_arg; 896 int faith; 897 898 if (faithprefix_p != NULL) 899 faith = (*faithprefix_p)(laddr); 900 else 901 faith = 0; 902 903 /* 904 * First look for an exact match. 905 */ 906 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 907 lport, fport, 908 pcbinfo->hashmask)]; 909 LIST_FOREACH(inp, head, inp_hash) { 910 if ((inp->inp_vflag & INP_IPV6) == 0) 911 continue; 912 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 913 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 914 inp->inp_fport == fport && 915 inp->inp_lport == lport) { 916 /* 917 * Found. 918 */ 919 return (inp); 920 } 921 } 922 if (wildcard) { 923 struct inpcb *local_wild = NULL; 924 925 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 926 pcbinfo->hashmask)]; 927 LIST_FOREACH(inp, head, inp_hash) { 928 if ((inp->inp_vflag & INP_IPV6) == 0) 929 continue; 930 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 931 inp->inp_lport == lport) { 932 if (faith && (inp->inp_flags & INP_FAITH) == 0) 933 continue; 934 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 935 laddr)) 936 return (inp); 937 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 938 local_wild = inp; 939 } 940 } 941 return (local_wild); 942 } 943 944 /* 945 * Not found. 946 */ 947 return (NULL); 948 } 949 950 void 951 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 952 { 953 struct ip6_hdr *ip; 954 955 ip = mtod(m, struct ip6_hdr *); 956 bzero(sin6, sizeof(*sin6)); 957 sin6->sin6_len = sizeof(*sin6); 958 sin6->sin6_family = AF_INET6; 959 sin6->sin6_addr = ip->ip6_src; 960 961 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 962 963 return; 964 }
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