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sys/netinet6/in6_pcb.c
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1 /* $FreeBSD: releng/6.1/sys/netinet6/in6_pcb.c 158179 2006-04-30 16:44:43Z cvs2svn $ */ 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 * 4. 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 #include "opt_ipsec.h" 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/malloc.h> 72 #include <sys/mbuf.h> 73 #include <sys/domain.h> 74 #include <sys/protosw.h> 75 #include <sys/socket.h> 76 #include <sys/socketvar.h> 77 #include <sys/sockio.h> 78 #include <sys/errno.h> 79 #include <sys/time.h> 80 #include <sys/proc.h> 81 #include <sys/jail.h> 82 83 #include <vm/uma.h> 84 85 #include <net/if.h> 86 #include <net/if_types.h> 87 #include <net/route.h> 88 89 #include <netinet/in.h> 90 #include <netinet/in_var.h> 91 #include <netinet/in_systm.h> 92 #include <netinet/tcp_var.h> 93 #include <netinet/ip6.h> 94 #include <netinet/ip_var.h> 95 #include <netinet6/ip6_var.h> 96 #include <netinet6/nd6.h> 97 #include <netinet/in_pcb.h> 98 #include <netinet6/in6_pcb.h> 99 #include <netinet6/scope6_var.h> 100 101 #ifdef IPSEC 102 #include <netinet6/ipsec.h> 103 #ifdef INET6 104 #include <netinet6/ipsec6.h> 105 #endif 106 #include <netinet6/ah.h> 107 #ifdef INET6 108 #include <netinet6/ah6.h> 109 #endif 110 #include <netkey/key.h> 111 #endif /* IPSEC */ 112 113 #ifdef FAST_IPSEC 114 #include <netipsec/ipsec.h> 115 #include <netipsec/ipsec6.h> 116 #include <netipsec/key.h> 117 #endif /* FAST_IPSEC */ 118 119 struct in6_addr zeroin6_addr; 120 121 int 122 in6_pcbbind(inp, nam, cred) 123 register struct inpcb *inp; 124 struct sockaddr *nam; 125 struct ucred *cred; 126 { 127 struct socket *so = inp->inp_socket; 128 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 129 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 130 u_short lport = 0; 131 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 132 133 INP_INFO_WLOCK_ASSERT(pcbinfo); 134 INP_LOCK_ASSERT(inp); 135 136 if (!in6_ifaddr) /* XXX broken! */ 137 return (EADDRNOTAVAIL); 138 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 139 return (EINVAL); 140 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 141 wild = 1; 142 if (nam) { 143 int error; 144 145 sin6 = (struct sockaddr_in6 *)nam; 146 if (nam->sa_len != sizeof(*sin6)) 147 return (EINVAL); 148 /* 149 * family check. 150 */ 151 if (nam->sa_family != AF_INET6) 152 return (EAFNOSUPPORT); 153 154 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 155 return(error); 156 157 lport = sin6->sin6_port; 158 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 159 /* 160 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 161 * allow compepte duplication of binding if 162 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 163 * and a multicast address is bound on both 164 * new and duplicated sockets. 165 */ 166 if (so->so_options & SO_REUSEADDR) 167 reuseport = SO_REUSEADDR|SO_REUSEPORT; 168 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 169 struct ifaddr *ia = NULL; 170 171 sin6->sin6_port = 0; /* yech... */ 172 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 173 return (EADDRNOTAVAIL); 174 175 /* 176 * XXX: bind to an anycast address might accidentally 177 * cause sending a packet with anycast source address. 178 * We should allow to bind to a deprecated address, since 179 * the application dares to use it. 180 */ 181 if (ia && 182 ((struct in6_ifaddr *)ia)->ia6_flags & 183 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 184 return (EADDRNOTAVAIL); 185 } 186 } 187 if (lport) { 188 struct inpcb *t; 189 190 /* GROSS */ 191 if (ntohs(lport) < IPV6PORT_RESERVED && 192 suser_cred(cred, SUSER_ALLOWJAIL)) 193 return (EACCES); 194 if (so->so_cred->cr_uid != 0 && 195 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 196 t = in6_pcblookup_local(pcbinfo, 197 &sin6->sin6_addr, lport, 198 INPLOOKUP_WILDCARD); 199 if (t && 200 ((t->inp_vflag & 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) && (so->so_cred->cr_uid != 207 t->inp_socket->so_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); 217 if (t && 218 ((t->inp_vflag & 219 INP_TIMEWAIT) == 0) && 220 (so->so_type != SOCK_STREAM || 221 ntohl(t->inp_faddr.s_addr) == 222 INADDR_ANY) && 223 (so->so_cred->cr_uid != 224 t->inp_socket->so_cred->cr_uid)) 225 return (EADDRINUSE); 226 } 227 } 228 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 229 lport, wild); 230 if (t && (reuseport & ((t->inp_vflag & 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); 241 if (t && t->inp_vflag & 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 int e; 262 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 263 return (e); 264 } 265 else { 266 inp->inp_lport = lport; 267 if (in_pcbinshash(inp) != 0) { 268 inp->in6p_laddr = in6addr_any; 269 inp->inp_lport = 0; 270 return (EAGAIN); 271 } 272 } 273 return (0); 274 } 275 276 /* 277 * Transform old in6_pcbconnect() into an inner subroutine for new 278 * in6_pcbconnect(): Do some validity-checking on the remote 279 * address (in mbuf 'nam') and then determine local host address 280 * (i.e., which interface) to use to access that remote host. 281 * 282 * This preserves definition of in6_pcbconnect(), while supporting a 283 * slightly different version for T/TCP. (This is more than 284 * a bit of a kludge, but cleaning up the internal interfaces would 285 * have forced minor changes in every protocol). 286 */ 287 288 int 289 in6_pcbladdr(inp, nam, plocal_addr6) 290 register struct inpcb *inp; 291 struct sockaddr *nam; 292 struct in6_addr **plocal_addr6; 293 { 294 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 295 int error = 0; 296 struct ifnet *ifp = NULL; 297 int scope_ambiguous = 0; 298 299 if (nam->sa_len != sizeof (*sin6)) 300 return (EINVAL); 301 if (sin6->sin6_family != AF_INET6) 302 return (EAFNOSUPPORT); 303 if (sin6->sin6_port == 0) 304 return (EADDRNOTAVAIL); 305 306 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 307 scope_ambiguous = 1; 308 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 309 return(error); 310 311 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 312 INP_LOCK_ASSERT(inp); 313 314 if (in6_ifaddr) { 315 /* 316 * If the destination address is UNSPECIFIED addr, 317 * use the loopback addr, e.g ::1. 318 */ 319 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 320 sin6->sin6_addr = in6addr_loopback; 321 } 322 323 /* 324 * XXX: in6_selectsrc might replace the bound local address 325 * with the address specified by setsockopt(IPV6_PKTINFO). 326 * Is it the intended behavior? 327 */ 328 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 329 inp->in6p_moptions, NULL, 330 &inp->in6p_laddr, &ifp, &error); 331 if (ifp && scope_ambiguous && 332 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 333 return(error); 334 } 335 336 if (*plocal_addr6 == 0) { 337 if (error == 0) 338 error = EADDRNOTAVAIL; 339 return (error); 340 } 341 /* 342 * Don't do pcblookup call here; return interface in 343 * plocal_addr6 344 * and exit to caller, that will do the lookup. 345 */ 346 347 return (0); 348 } 349 350 /* 351 * Outer subroutine: 352 * Connect from a socket to a specified address. 353 * Both address and port must be specified in argument sin. 354 * If don't have a local address for this socket yet, 355 * then pick one. 356 */ 357 int 358 in6_pcbconnect(inp, nam, cred) 359 register struct inpcb *inp; 360 struct sockaddr *nam; 361 struct ucred *cred; 362 { 363 struct in6_addr *addr6; 364 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 365 int error; 366 367 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 368 INP_LOCK_ASSERT(inp); 369 370 /* 371 * Call inner routine, to assign local interface address. 372 * in6_pcbladdr() may automatically fill in sin6_scope_id. 373 */ 374 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 375 return (error); 376 377 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 378 sin6->sin6_port, 379 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 380 ? addr6 : &inp->in6p_laddr, 381 inp->inp_lport, 0, NULL) != NULL) { 382 return (EADDRINUSE); 383 } 384 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 385 if (inp->inp_lport == 0) { 386 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 387 if (error) 388 return (error); 389 } 390 inp->in6p_laddr = *addr6; 391 } 392 inp->in6p_faddr = sin6->sin6_addr; 393 inp->inp_fport = sin6->sin6_port; 394 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 395 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 396 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 397 inp->in6p_flowinfo |= 398 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 399 400 in_pcbrehash(inp); 401 #ifdef IPSEC 402 if (inp->inp_socket->so_type == SOCK_STREAM) 403 ipsec_pcbconn(inp->inp_sp); 404 #endif 405 return (0); 406 } 407 408 void 409 in6_pcbdisconnect(inp) 410 struct inpcb *inp; 411 { 412 413 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 414 INP_LOCK_ASSERT(inp); 415 416 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 417 inp->inp_fport = 0; 418 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 419 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 420 in_pcbrehash(inp); 421 #ifdef IPSEC 422 ipsec_pcbdisconn(inp->inp_sp); 423 #endif 424 if (inp->inp_socket->so_state & SS_NOFDREF) 425 in6_pcbdetach(inp); 426 } 427 428 void 429 in6_pcbdetach(inp) 430 struct inpcb *inp; 431 { 432 struct socket *so = inp->inp_socket; 433 struct inpcbinfo *ipi = inp->inp_pcbinfo; 434 435 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 436 INP_LOCK_ASSERT(inp); 437 438 #if defined(IPSEC) || defined(FAST_IPSEC) 439 if (inp->in6p_sp != NULL) 440 ipsec6_delete_pcbpolicy(inp); 441 #endif /* IPSEC */ 442 inp->inp_gencnt = ++ipi->ipi_gencnt; 443 in_pcbremlists(inp); 444 445 if (so) { 446 ACCEPT_LOCK(); 447 SOCK_LOCK(so); 448 so->so_pcb = NULL; 449 sotryfree(so); 450 } 451 452 ip6_freepcbopts(inp->in6p_outputopts); 453 ip6_freemoptions(inp->in6p_moptions); 454 /* Check and free IPv4 related resources in case of mapped addr */ 455 if (inp->inp_options) 456 (void)m_free(inp->inp_options); 457 ip_freemoptions(inp->inp_moptions); 458 inp->inp_vflag = 0; 459 INP_LOCK_DESTROY(inp); 460 uma_zfree(ipi->ipi_zone, inp); 461 } 462 463 struct sockaddr * 464 in6_sockaddr(port, addr_p) 465 in_port_t port; 466 struct in6_addr *addr_p; 467 { 468 struct sockaddr_in6 *sin6; 469 470 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 471 bzero(sin6, sizeof *sin6); 472 sin6->sin6_family = AF_INET6; 473 sin6->sin6_len = sizeof(*sin6); 474 sin6->sin6_port = port; 475 sin6->sin6_addr = *addr_p; 476 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 477 478 return (struct sockaddr *)sin6; 479 } 480 481 struct sockaddr * 482 in6_v4mapsin6_sockaddr(port, addr_p) 483 in_port_t port; 484 struct in_addr *addr_p; 485 { 486 struct sockaddr_in sin; 487 struct sockaddr_in6 *sin6_p; 488 489 bzero(&sin, sizeof sin); 490 sin.sin_family = AF_INET; 491 sin.sin_len = sizeof(sin); 492 sin.sin_port = port; 493 sin.sin_addr = *addr_p; 494 495 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 496 M_WAITOK); 497 in6_sin_2_v4mapsin6(&sin, sin6_p); 498 499 return (struct sockaddr *)sin6_p; 500 } 501 502 /* 503 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 504 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 505 * in struct pr_usrreqs, so that protocols can just reference then directly 506 * without the need for a wrapper function. The socket must have a valid 507 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 508 * except through a kernel programming error, so it is acceptable to panic 509 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 510 * because there actually /is/ a programming error somewhere... XXX) 511 */ 512 int 513 in6_setsockaddr(so, nam) 514 struct socket *so; 515 struct sockaddr **nam; 516 { 517 int s; 518 register struct inpcb *inp; 519 struct in6_addr addr; 520 in_port_t port; 521 522 s = splnet(); 523 inp = sotoinpcb(so); 524 if (!inp) { 525 splx(s); 526 return EINVAL; 527 } 528 port = inp->inp_lport; 529 addr = inp->in6p_laddr; 530 splx(s); 531 532 *nam = in6_sockaddr(port, &addr); 533 return 0; 534 } 535 536 int 537 in6_setpeeraddr(so, nam) 538 struct socket *so; 539 struct sockaddr **nam; 540 { 541 int s; 542 struct inpcb *inp; 543 struct in6_addr addr; 544 in_port_t port; 545 546 s = splnet(); 547 inp = sotoinpcb(so); 548 if (!inp) { 549 splx(s); 550 return EINVAL; 551 } 552 port = inp->inp_fport; 553 addr = inp->in6p_faddr; 554 splx(s); 555 556 *nam = in6_sockaddr(port, &addr); 557 return 0; 558 } 559 560 int 561 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 562 { 563 struct inpcb *inp = sotoinpcb(so); 564 int error; 565 566 if (inp == NULL) 567 return EINVAL; 568 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 569 error = in_setsockaddr(so, nam, &tcbinfo); 570 if (error == 0) 571 in6_sin_2_v4mapsin6_in_sock(nam); 572 } else { 573 /* scope issues will be handled in in6_setsockaddr(). */ 574 error = in6_setsockaddr(so, nam); 575 } 576 577 return error; 578 } 579 580 int 581 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 582 { 583 struct inpcb *inp = sotoinpcb(so); 584 int error; 585 586 if (inp == NULL) 587 return EINVAL; 588 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 589 error = in_setpeeraddr(so, nam, &tcbinfo); 590 if (error == 0) 591 in6_sin_2_v4mapsin6_in_sock(nam); 592 } else 593 /* scope issues will be handled in in6_setpeeraddr(). */ 594 error = in6_setpeeraddr(so, nam); 595 596 return error; 597 } 598 599 /* 600 * Pass some notification to all connections of a protocol 601 * associated with address dst. The local address and/or port numbers 602 * may be specified to limit the search. The "usual action" will be 603 * taken, depending on the ctlinput cmd. The caller must filter any 604 * cmds that are uninteresting (e.g., no error in the map). 605 * Call the protocol specific routine (if any) to report 606 * any errors for each matching socket. 607 * 608 * Must be called at splnet. 609 */ 610 void 611 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 612 struct inpcbinfo *pcbinfo; 613 struct sockaddr *dst; 614 const struct sockaddr *src; 615 u_int fport_arg, lport_arg; 616 int cmd; 617 void *cmdarg; 618 struct inpcb *(*notify) __P((struct inpcb *, int)); 619 { 620 struct inpcbhead *head; 621 struct inpcb *inp, *ninp; 622 struct sockaddr_in6 sa6_src, *sa6_dst; 623 u_short fport = fport_arg, lport = lport_arg; 624 u_int32_t flowinfo; 625 int errno, s; 626 627 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 628 return; 629 630 sa6_dst = (struct sockaddr_in6 *)dst; 631 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 632 return; 633 634 /* 635 * note that src can be NULL when we get notify by local fragmentation. 636 */ 637 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 638 flowinfo = sa6_src.sin6_flowinfo; 639 640 /* 641 * Redirects go to all references to the destination, 642 * and use in6_rtchange to invalidate the route cache. 643 * Dead host indications: also use in6_rtchange to invalidate 644 * the cache, and deliver the error to all the sockets. 645 * Otherwise, if we have knowledge of the local port and address, 646 * deliver only to that socket. 647 */ 648 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 649 fport = 0; 650 lport = 0; 651 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 652 653 if (cmd != PRC_HOSTDEAD) 654 notify = in6_rtchange; 655 } 656 errno = inet6ctlerrmap[cmd]; 657 s = splnet(); 658 head = pcbinfo->listhead; 659 INP_INFO_WLOCK(pcbinfo); 660 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 661 INP_LOCK(inp); 662 ninp = LIST_NEXT(inp, inp_list); 663 664 if ((inp->inp_vflag & INP_IPV6) == 0) { 665 INP_UNLOCK(inp); 666 continue; 667 } 668 669 /* 670 * If the error designates a new path MTU for a destination 671 * and the application (associated with this socket) wanted to 672 * know the value, notify. Note that we notify for all 673 * disconnected sockets if the corresponding application 674 * wanted. This is because some UDP applications keep sending 675 * sockets disconnected. 676 * XXX: should we avoid to notify the value to TCP sockets? 677 */ 678 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 679 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 680 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 681 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 682 (u_int32_t *)cmdarg); 683 } 684 685 /* 686 * Detect if we should notify the error. If no source and 687 * destination ports are specifed, but non-zero flowinfo and 688 * local address match, notify the error. This is the case 689 * when the error is delivered with an encrypted buffer 690 * by ESP. Otherwise, just compare addresses and ports 691 * as usual. 692 */ 693 if (lport == 0 && fport == 0 && flowinfo && 694 inp->inp_socket != NULL && 695 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 696 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 697 goto do_notify; 698 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 699 &sa6_dst->sin6_addr) || 700 inp->inp_socket == 0 || 701 (lport && inp->inp_lport != lport) || 702 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 703 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 704 &sa6_src.sin6_addr)) || 705 (fport && inp->inp_fport != fport)) { 706 INP_UNLOCK(inp); 707 continue; 708 } 709 710 do_notify: 711 if (notify) { 712 if ((*notify)(inp, errno)) 713 INP_UNLOCK(inp); 714 } else 715 INP_UNLOCK(inp); 716 } 717 INP_INFO_WUNLOCK(pcbinfo); 718 splx(s); 719 } 720 721 /* 722 * Lookup a PCB based on the local address and port. 723 */ 724 struct inpcb * 725 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 726 struct inpcbinfo *pcbinfo; 727 struct in6_addr *laddr; 728 u_int lport_arg; 729 int wild_okay; 730 { 731 register struct inpcb *inp; 732 int matchwild = 3, wildcard; 733 u_short lport = lport_arg; 734 735 if (!wild_okay) { 736 struct inpcbhead *head; 737 /* 738 * Look for an unconnected (wildcard foreign addr) PCB that 739 * matches the local address and port we're looking for. 740 */ 741 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 742 pcbinfo->hashmask)]; 743 LIST_FOREACH(inp, head, inp_hash) { 744 if ((inp->inp_vflag & INP_IPV6) == 0) 745 continue; 746 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 747 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 748 inp->inp_lport == lport) { 749 /* 750 * Found. 751 */ 752 return (inp); 753 } 754 } 755 /* 756 * Not found. 757 */ 758 return (NULL); 759 } else { 760 struct inpcbporthead *porthash; 761 struct inpcbport *phd; 762 struct inpcb *match = NULL; 763 /* 764 * Best fit PCB lookup. 765 * 766 * First see if this local port is in use by looking on the 767 * port hash list. 768 */ 769 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 770 pcbinfo->porthashmask)]; 771 LIST_FOREACH(phd, porthash, phd_hash) { 772 if (phd->phd_port == lport) 773 break; 774 } 775 if (phd != NULL) { 776 /* 777 * Port is in use by one or more PCBs. Look for best 778 * fit. 779 */ 780 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 781 wildcard = 0; 782 if ((inp->inp_vflag & INP_IPV6) == 0) 783 continue; 784 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 785 wildcard++; 786 if (!IN6_IS_ADDR_UNSPECIFIED( 787 &inp->in6p_laddr)) { 788 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 789 wildcard++; 790 else if (!IN6_ARE_ADDR_EQUAL( 791 &inp->in6p_laddr, laddr)) 792 continue; 793 } else { 794 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 795 wildcard++; 796 } 797 if (wildcard < matchwild) { 798 match = inp; 799 matchwild = wildcard; 800 if (matchwild == 0) { 801 break; 802 } 803 } 804 } 805 } 806 return (match); 807 } 808 } 809 810 void 811 in6_pcbpurgeif0(head, ifp) 812 struct in6pcb *head; 813 struct ifnet *ifp; 814 { 815 struct in6pcb *in6p; 816 struct ip6_moptions *im6o; 817 struct in6_multi_mship *imm, *nimm; 818 819 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 820 im6o = in6p->in6p_moptions; 821 if ((in6p->inp_vflag & INP_IPV6) && 822 im6o) { 823 /* 824 * Unselect the outgoing interface if it is being 825 * detached. 826 */ 827 if (im6o->im6o_multicast_ifp == ifp) 828 im6o->im6o_multicast_ifp = NULL; 829 830 /* 831 * Drop multicast group membership if we joined 832 * through the interface being detached. 833 * XXX controversial - is it really legal for kernel 834 * to force this? 835 */ 836 for (imm = im6o->im6o_memberships.lh_first; 837 imm != NULL; imm = nimm) { 838 nimm = imm->i6mm_chain.le_next; 839 if (imm->i6mm_maddr->in6m_ifp == ifp) { 840 LIST_REMOVE(imm, i6mm_chain); 841 in6_delmulti(imm->i6mm_maddr); 842 free(imm, M_IP6MADDR); 843 } 844 } 845 } 846 } 847 } 848 849 /* 850 * Check for alternatives when higher level complains 851 * about service problems. For now, invalidate cached 852 * routing information. If the route was created dynamically 853 * (by a redirect), time to try a default gateway again. 854 */ 855 void 856 in6_losing(in6p) 857 struct inpcb *in6p; 858 { 859 /* 860 * We don't store route pointers in the routing table anymore 861 */ 862 return; 863 } 864 865 /* 866 * After a routing change, flush old routing 867 * and allocate a (hopefully) better one. 868 */ 869 struct inpcb * 870 in6_rtchange(inp, errno) 871 struct inpcb *inp; 872 int errno; 873 { 874 /* 875 * We don't store route pointers in the routing table anymore 876 */ 877 return inp; 878 } 879 880 /* 881 * Lookup PCB in hash list. 882 */ 883 struct inpcb * 884 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 885 struct inpcbinfo *pcbinfo; 886 struct in6_addr *faddr, *laddr; 887 u_int fport_arg, lport_arg; 888 int wildcard; 889 struct ifnet *ifp; 890 { 891 struct inpcbhead *head; 892 register struct inpcb *inp; 893 u_short fport = fport_arg, lport = lport_arg; 894 int faith; 895 896 if (faithprefix_p != NULL) 897 faith = (*faithprefix_p)(laddr); 898 else 899 faith = 0; 900 901 /* 902 * First look for an exact match. 903 */ 904 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 905 lport, fport, 906 pcbinfo->hashmask)]; 907 LIST_FOREACH(inp, head, inp_hash) { 908 if ((inp->inp_vflag & INP_IPV6) == 0) 909 continue; 910 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 911 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 912 inp->inp_fport == fport && 913 inp->inp_lport == lport) { 914 /* 915 * Found. 916 */ 917 return (inp); 918 } 919 } 920 if (wildcard) { 921 struct inpcb *local_wild = NULL; 922 923 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 924 pcbinfo->hashmask)]; 925 LIST_FOREACH(inp, head, inp_hash) { 926 if ((inp->inp_vflag & INP_IPV6) == 0) 927 continue; 928 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 929 inp->inp_lport == lport) { 930 if (faith && (inp->inp_flags & INP_FAITH) == 0) 931 continue; 932 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 933 laddr)) 934 return (inp); 935 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 936 local_wild = inp; 937 } 938 } 939 return (local_wild); 940 } 941 942 /* 943 * Not found. 944 */ 945 return (NULL); 946 } 947 948 void 949 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 950 { 951 struct ip6_hdr *ip; 952 953 ip = mtod(m, struct ip6_hdr *); 954 bzero(sin6, sizeof(*sin6)); 955 sin6->sin6_len = sizeof(*sin6); 956 sin6->sin6_family = AF_INET6; 957 sin6->sin6_addr = ip->ip6_src; 958 959 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 960 961 return; 962 }
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