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sys/netinet6/in6_pcb.c
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1 /* $FreeBSD: releng/6.3/sys/netinet6/in6_pcb.c 174867 2007-12-22 16:49:20Z rwatson $ */ 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 #include "opt_mac.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/mac.h> 73 #include <sys/malloc.h> 74 #include <sys/mbuf.h> 75 #include <sys/domain.h> 76 #include <sys/protosw.h> 77 #include <sys/socket.h> 78 #include <sys/socketvar.h> 79 #include <sys/sockio.h> 80 #include <sys/errno.h> 81 #include <sys/time.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 #include <netinet6/ip6_var.h> 98 #include <netinet6/nd6.h> 99 #include <netinet/in_pcb.h> 100 #include <netinet6/in6_pcb.h> 101 #include <netinet6/scope6_var.h> 102 103 #ifdef IPSEC 104 #include <netinet6/ipsec.h> 105 #ifdef INET6 106 #include <netinet6/ipsec6.h> 107 #endif 108 #include <netinet6/ah.h> 109 #ifdef INET6 110 #include <netinet6/ah6.h> 111 #endif 112 #include <netkey/key.h> 113 #endif /* IPSEC */ 114 115 #ifdef FAST_IPSEC 116 #include <netipsec/ipsec.h> 117 #include <netipsec/ipsec6.h> 118 #include <netipsec/key.h> 119 #endif /* FAST_IPSEC */ 120 121 struct in6_addr zeroin6_addr; 122 123 int 124 in6_pcbbind(inp, nam, cred) 125 register struct inpcb *inp; 126 struct sockaddr *nam; 127 struct ucred *cred; 128 { 129 struct socket *so = inp->inp_socket; 130 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 131 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 132 u_short lport = 0; 133 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 134 135 INP_INFO_WLOCK_ASSERT(pcbinfo); 136 INP_LOCK_ASSERT(inp); 137 138 if (!in6_ifaddr) /* XXX broken! */ 139 return (EADDRNOTAVAIL); 140 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 141 return (EINVAL); 142 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 143 wild = 1; 144 if (nam) { 145 int error; 146 147 sin6 = (struct sockaddr_in6 *)nam; 148 if (nam->sa_len != sizeof(*sin6)) 149 return (EINVAL); 150 /* 151 * family check. 152 */ 153 if (nam->sa_family != AF_INET6) 154 return (EAFNOSUPPORT); 155 156 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 157 return(error); 158 159 lport = sin6->sin6_port; 160 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 161 /* 162 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 163 * allow compepte duplication of binding if 164 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 165 * and a multicast address is bound on both 166 * new and duplicated sockets. 167 */ 168 if (so->so_options & SO_REUSEADDR) 169 reuseport = SO_REUSEADDR|SO_REUSEPORT; 170 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 171 struct ifaddr *ia = NULL; 172 173 sin6->sin6_port = 0; /* yech... */ 174 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 175 return (EADDRNOTAVAIL); 176 177 /* 178 * XXX: bind to an anycast address might accidentally 179 * cause sending a packet with anycast source address. 180 * We should allow to bind to a deprecated address, since 181 * the application dares to use it. 182 */ 183 if (ia && 184 ((struct in6_ifaddr *)ia)->ia6_flags & 185 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 186 return (EADDRNOTAVAIL); 187 } 188 } 189 if (lport) { 190 struct inpcb *t; 191 192 /* GROSS */ 193 if (ntohs(lport) <= ipport_reservedhigh && 194 ntohs(lport) >= ipport_reservedlow && 195 suser_cred(cred, SUSER_ALLOWJAIL)) 196 return (EACCES); 197 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 198 suser_cred(so->so_cred, SUSER_ALLOWJAIL) != 0) { 199 t = in6_pcblookup_local(pcbinfo, 200 &sin6->sin6_addr, lport, 201 INPLOOKUP_WILDCARD); 202 if (t && 203 ((t->inp_vflag & INP_TIMEWAIT) == 0) && 204 (so->so_type != SOCK_STREAM || 205 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 206 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 207 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 208 (t->inp_socket->so_options & SO_REUSEPORT) 209 == 0) && (so->so_cred->cr_uid != 210 t->inp_socket->so_cred->cr_uid)) 211 return (EADDRINUSE); 212 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 213 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 214 struct sockaddr_in sin; 215 216 in6_sin6_2_sin(&sin, sin6); 217 t = in_pcblookup_local(pcbinfo, 218 sin.sin_addr, lport, 219 INPLOOKUP_WILDCARD); 220 if (t && 221 ((t->inp_vflag & 222 INP_TIMEWAIT) == 0) && 223 (so->so_type != SOCK_STREAM || 224 ntohl(t->inp_faddr.s_addr) == 225 INADDR_ANY) && 226 (so->so_cred->cr_uid != 227 t->inp_socket->so_cred->cr_uid)) 228 return (EADDRINUSE); 229 } 230 } 231 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 232 lport, wild); 233 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 234 intotw(t)->tw_so_options : 235 t->inp_socket->so_options)) == 0) 236 return (EADDRINUSE); 237 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 238 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 239 struct sockaddr_in sin; 240 241 in6_sin6_2_sin(&sin, sin6); 242 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 243 lport, wild); 244 if (t && t->inp_vflag & INP_TIMEWAIT) { 245 if ((reuseport & 246 intotw(t)->tw_so_options) == 0 && 247 (ntohl(t->inp_laddr.s_addr) != 248 INADDR_ANY || ((inp->inp_vflag & 249 INP_IPV6PROTO) == 250 (t->inp_vflag & INP_IPV6PROTO)))) 251 return (EADDRINUSE); 252 } 253 else if (t && 254 (reuseport & t->inp_socket->so_options) 255 == 0 && (ntohl(t->inp_laddr.s_addr) != 256 INADDR_ANY || INP_SOCKAF(so) == 257 INP_SOCKAF(t->inp_socket))) 258 return (EADDRINUSE); 259 } 260 } 261 inp->in6p_laddr = sin6->sin6_addr; 262 } 263 if (lport == 0) { 264 int e; 265 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 266 return (e); 267 } 268 else { 269 inp->inp_lport = lport; 270 if (in_pcbinshash(inp) != 0) { 271 inp->in6p_laddr = in6addr_any; 272 inp->inp_lport = 0; 273 return (EAGAIN); 274 } 275 } 276 return (0); 277 } 278 279 /* 280 * Transform old in6_pcbconnect() into an inner subroutine for new 281 * in6_pcbconnect(): Do some validity-checking on the remote 282 * address (in mbuf 'nam') and then determine local host address 283 * (i.e., which interface) to use to access that remote host. 284 * 285 * This preserves definition of in6_pcbconnect(), while supporting a 286 * slightly different version for T/TCP. (This is more than 287 * a bit of a kludge, but cleaning up the internal interfaces would 288 * have forced minor changes in every protocol). 289 */ 290 291 int 292 in6_pcbladdr(inp, nam, plocal_addr6) 293 register struct inpcb *inp; 294 struct sockaddr *nam; 295 struct in6_addr **plocal_addr6; 296 { 297 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 298 int error = 0; 299 struct ifnet *ifp = NULL; 300 int scope_ambiguous = 0; 301 302 if (nam->sa_len != sizeof (*sin6)) 303 return (EINVAL); 304 if (sin6->sin6_family != AF_INET6) 305 return (EAFNOSUPPORT); 306 if (sin6->sin6_port == 0) 307 return (EADDRNOTAVAIL); 308 309 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 310 scope_ambiguous = 1; 311 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 312 return(error); 313 314 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 315 INP_LOCK_ASSERT(inp); 316 317 if (in6_ifaddr) { 318 /* 319 * If the destination address is UNSPECIFIED addr, 320 * use the loopback addr, e.g ::1. 321 */ 322 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 323 sin6->sin6_addr = in6addr_loopback; 324 } 325 326 /* 327 * XXX: in6_selectsrc might replace the bound local address 328 * with the address specified by setsockopt(IPV6_PKTINFO). 329 * Is it the intended behavior? 330 */ 331 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 332 inp->in6p_moptions, NULL, 333 &inp->in6p_laddr, &ifp, &error); 334 if (ifp && scope_ambiguous && 335 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 336 return(error); 337 } 338 339 if (*plocal_addr6 == 0) { 340 if (error == 0) 341 error = EADDRNOTAVAIL; 342 return (error); 343 } 344 /* 345 * Don't do pcblookup call here; return interface in 346 * plocal_addr6 347 * and exit to caller, that will do the lookup. 348 */ 349 350 return (0); 351 } 352 353 /* 354 * Outer subroutine: 355 * Connect from a socket to a specified address. 356 * Both address and port must be specified in argument sin. 357 * If don't have a local address for this socket yet, 358 * then pick one. 359 */ 360 int 361 in6_pcbconnect(inp, nam, cred) 362 register struct inpcb *inp; 363 struct sockaddr *nam; 364 struct ucred *cred; 365 { 366 struct in6_addr *addr6; 367 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 368 int error; 369 370 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 371 INP_LOCK_ASSERT(inp); 372 373 /* 374 * Call inner routine, to assign local interface address. 375 * in6_pcbladdr() may automatically fill in sin6_scope_id. 376 */ 377 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 378 return (error); 379 380 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 381 sin6->sin6_port, 382 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 383 ? addr6 : &inp->in6p_laddr, 384 inp->inp_lport, 0, NULL) != NULL) { 385 return (EADDRINUSE); 386 } 387 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 388 if (inp->inp_lport == 0) { 389 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 390 if (error) 391 return (error); 392 } 393 inp->in6p_laddr = *addr6; 394 } 395 inp->in6p_faddr = sin6->sin6_addr; 396 inp->inp_fport = sin6->sin6_port; 397 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 398 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 399 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 400 inp->in6p_flowinfo |= 401 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 402 403 in_pcbrehash(inp); 404 #ifdef IPSEC 405 if (inp->inp_socket->so_type == SOCK_STREAM) 406 ipsec_pcbconn(inp->inp_sp); 407 #endif 408 return (0); 409 } 410 411 void 412 in6_pcbdisconnect(inp) 413 struct inpcb *inp; 414 { 415 416 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 417 INP_LOCK_ASSERT(inp); 418 419 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 420 inp->inp_fport = 0; 421 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 422 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 423 in_pcbrehash(inp); 424 #ifdef IPSEC 425 ipsec_pcbdisconn(inp->inp_sp); 426 #endif 427 if (inp->inp_socket->so_state & SS_NOFDREF) 428 in6_pcbdetach(inp); 429 } 430 431 void 432 in6_pcbdetach(inp) 433 struct inpcb *inp; 434 { 435 struct socket *so = inp->inp_socket; 436 struct inpcbinfo *ipi = inp->inp_pcbinfo; 437 438 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 439 INP_LOCK_ASSERT(inp); 440 441 #if defined(IPSEC) || defined(FAST_IPSEC) 442 if (inp->in6p_sp != NULL) 443 ipsec6_delete_pcbpolicy(inp); 444 #endif /* IPSEC */ 445 inp->inp_gencnt = ++ipi->ipi_gencnt; 446 in_pcbremlists(inp); 447 448 if (so) { 449 ACCEPT_LOCK(); 450 SOCK_LOCK(so); 451 so->so_pcb = NULL; 452 sotryfree(so); 453 } 454 455 ip6_freepcbopts(inp->in6p_outputopts); 456 ip6_freemoptions(inp->in6p_moptions); 457 /* Check and free IPv4 related resources in case of mapped addr */ 458 if (inp->inp_options) 459 (void)m_free(inp->inp_options); 460 ip_freemoptions(inp->inp_moptions); 461 inp->inp_vflag = 0; 462 #ifdef MAC 463 mac_destroy_inpcb(inp); 464 #endif 465 INP_UNLOCK(inp); 466 uma_zfree(ipi->ipi_zone, inp); 467 } 468 469 struct sockaddr * 470 in6_sockaddr(port, addr_p) 471 in_port_t port; 472 struct in6_addr *addr_p; 473 { 474 struct sockaddr_in6 *sin6; 475 476 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 477 bzero(sin6, sizeof *sin6); 478 sin6->sin6_family = AF_INET6; 479 sin6->sin6_len = sizeof(*sin6); 480 sin6->sin6_port = port; 481 sin6->sin6_addr = *addr_p; 482 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 483 484 return (struct sockaddr *)sin6; 485 } 486 487 struct sockaddr * 488 in6_v4mapsin6_sockaddr(port, addr_p) 489 in_port_t port; 490 struct in_addr *addr_p; 491 { 492 struct sockaddr_in sin; 493 struct sockaddr_in6 *sin6_p; 494 495 bzero(&sin, sizeof sin); 496 sin.sin_family = AF_INET; 497 sin.sin_len = sizeof(sin); 498 sin.sin_port = port; 499 sin.sin_addr = *addr_p; 500 501 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 502 M_WAITOK); 503 in6_sin_2_v4mapsin6(&sin, sin6_p); 504 505 return (struct sockaddr *)sin6_p; 506 } 507 508 /* 509 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 510 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 511 * in struct pr_usrreqs, so that protocols can just reference then directly 512 * without the need for a wrapper function. The socket must have a valid 513 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 514 * except through a kernel programming error, so it is acceptable to panic 515 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 516 * because there actually /is/ a programming error somewhere... XXX) 517 */ 518 int 519 in6_setsockaddr(so, nam) 520 struct socket *so; 521 struct sockaddr **nam; 522 { 523 int s; 524 register struct inpcb *inp; 525 struct in6_addr addr; 526 in_port_t port; 527 528 s = splnet(); 529 inp = sotoinpcb(so); 530 if (!inp) { 531 splx(s); 532 return EINVAL; 533 } 534 port = inp->inp_lport; 535 addr = inp->in6p_laddr; 536 splx(s); 537 538 *nam = in6_sockaddr(port, &addr); 539 return 0; 540 } 541 542 int 543 in6_setpeeraddr(so, nam) 544 struct socket *so; 545 struct sockaddr **nam; 546 { 547 int s; 548 struct inpcb *inp; 549 struct in6_addr addr; 550 in_port_t port; 551 552 s = splnet(); 553 inp = sotoinpcb(so); 554 if (!inp) { 555 splx(s); 556 return EINVAL; 557 } 558 port = inp->inp_fport; 559 addr = inp->in6p_faddr; 560 splx(s); 561 562 *nam = in6_sockaddr(port, &addr); 563 return 0; 564 } 565 566 int 567 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 568 { 569 struct inpcb *inp = sotoinpcb(so); 570 int error; 571 572 if (inp == NULL) 573 return EINVAL; 574 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 575 error = in_setsockaddr(so, nam, &tcbinfo); 576 if (error == 0) 577 in6_sin_2_v4mapsin6_in_sock(nam); 578 } else { 579 /* scope issues will be handled in in6_setsockaddr(). */ 580 error = in6_setsockaddr(so, nam); 581 } 582 583 return error; 584 } 585 586 int 587 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 588 { 589 struct inpcb *inp = sotoinpcb(so); 590 int error; 591 592 if (inp == NULL) 593 return EINVAL; 594 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 595 error = in_setpeeraddr(so, nam, &tcbinfo); 596 if (error == 0) 597 in6_sin_2_v4mapsin6_in_sock(nam); 598 } else 599 /* scope issues will be handled in in6_setpeeraddr(). */ 600 error = in6_setpeeraddr(so, nam); 601 602 return error; 603 } 604 605 /* 606 * Pass some notification to all connections of a protocol 607 * associated with address dst. The local address and/or port numbers 608 * may be specified to limit the search. The "usual action" will be 609 * taken, depending on the ctlinput cmd. The caller must filter any 610 * cmds that are uninteresting (e.g., no error in the map). 611 * Call the protocol specific routine (if any) to report 612 * any errors for each matching socket. 613 * 614 * Must be called at splnet. 615 */ 616 void 617 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 618 struct inpcbinfo *pcbinfo; 619 struct sockaddr *dst; 620 const struct sockaddr *src; 621 u_int fport_arg, lport_arg; 622 int cmd; 623 void *cmdarg; 624 struct inpcb *(*notify) __P((struct inpcb *, int)); 625 { 626 struct inpcbhead *head; 627 struct inpcb *inp, *ninp; 628 struct sockaddr_in6 sa6_src, *sa6_dst; 629 u_short fport = fport_arg, lport = lport_arg; 630 u_int32_t flowinfo; 631 int errno, s; 632 633 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 634 return; 635 636 sa6_dst = (struct sockaddr_in6 *)dst; 637 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 638 return; 639 640 /* 641 * note that src can be NULL when we get notify by local fragmentation. 642 */ 643 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 644 flowinfo = sa6_src.sin6_flowinfo; 645 646 /* 647 * Redirects go to all references to the destination, 648 * and use in6_rtchange to invalidate the route cache. 649 * Dead host indications: also use in6_rtchange to invalidate 650 * the cache, and deliver the error to all the sockets. 651 * Otherwise, if we have knowledge of the local port and address, 652 * deliver only to that socket. 653 */ 654 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 655 fport = 0; 656 lport = 0; 657 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 658 659 if (cmd != PRC_HOSTDEAD) 660 notify = in6_rtchange; 661 } 662 errno = inet6ctlerrmap[cmd]; 663 s = splnet(); 664 head = pcbinfo->listhead; 665 INP_INFO_WLOCK(pcbinfo); 666 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 667 INP_LOCK(inp); 668 ninp = LIST_NEXT(inp, inp_list); 669 670 if ((inp->inp_vflag & INP_IPV6) == 0) { 671 INP_UNLOCK(inp); 672 continue; 673 } 674 675 /* 676 * If the error designates a new path MTU for a destination 677 * and the application (associated with this socket) wanted to 678 * know the value, notify. Note that we notify for all 679 * disconnected sockets if the corresponding application 680 * wanted. This is because some UDP applications keep sending 681 * sockets disconnected. 682 * XXX: should we avoid to notify the value to TCP sockets? 683 */ 684 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 685 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 686 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 687 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 688 (u_int32_t *)cmdarg); 689 } 690 691 /* 692 * Detect if we should notify the error. If no source and 693 * destination ports are specifed, but non-zero flowinfo and 694 * local address match, notify the error. This is the case 695 * when the error is delivered with an encrypted buffer 696 * by ESP. Otherwise, just compare addresses and ports 697 * as usual. 698 */ 699 if (lport == 0 && fport == 0 && flowinfo && 700 inp->inp_socket != NULL && 701 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 702 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 703 goto do_notify; 704 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 705 &sa6_dst->sin6_addr) || 706 inp->inp_socket == 0 || 707 (lport && inp->inp_lport != lport) || 708 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 709 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 710 &sa6_src.sin6_addr)) || 711 (fport && inp->inp_fport != fport)) { 712 INP_UNLOCK(inp); 713 continue; 714 } 715 716 do_notify: 717 if (notify) { 718 if ((*notify)(inp, errno)) 719 INP_UNLOCK(inp); 720 } else 721 INP_UNLOCK(inp); 722 } 723 INP_INFO_WUNLOCK(pcbinfo); 724 splx(s); 725 } 726 727 /* 728 * Lookup a PCB based on the local address and port. 729 */ 730 struct inpcb * 731 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 732 struct inpcbinfo *pcbinfo; 733 struct in6_addr *laddr; 734 u_int lport_arg; 735 int wild_okay; 736 { 737 register struct inpcb *inp; 738 int matchwild = 3, wildcard; 739 u_short lport = lport_arg; 740 741 if (!wild_okay) { 742 struct inpcbhead *head; 743 /* 744 * Look for an unconnected (wildcard foreign addr) PCB that 745 * matches the local address and port we're looking for. 746 */ 747 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 748 pcbinfo->hashmask)]; 749 LIST_FOREACH(inp, head, inp_hash) { 750 if ((inp->inp_vflag & INP_IPV6) == 0) 751 continue; 752 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 753 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 754 inp->inp_lport == lport) { 755 /* 756 * Found. 757 */ 758 return (inp); 759 } 760 } 761 /* 762 * Not found. 763 */ 764 return (NULL); 765 } else { 766 struct inpcbporthead *porthash; 767 struct inpcbport *phd; 768 struct inpcb *match = NULL; 769 /* 770 * Best fit PCB lookup. 771 * 772 * First see if this local port is in use by looking on the 773 * port hash list. 774 */ 775 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 776 pcbinfo->porthashmask)]; 777 LIST_FOREACH(phd, porthash, phd_hash) { 778 if (phd->phd_port == lport) 779 break; 780 } 781 if (phd != NULL) { 782 /* 783 * Port is in use by one or more PCBs. Look for best 784 * fit. 785 */ 786 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 787 wildcard = 0; 788 if ((inp->inp_vflag & INP_IPV6) == 0) 789 continue; 790 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 791 wildcard++; 792 if (!IN6_IS_ADDR_UNSPECIFIED( 793 &inp->in6p_laddr)) { 794 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 795 wildcard++; 796 else if (!IN6_ARE_ADDR_EQUAL( 797 &inp->in6p_laddr, laddr)) 798 continue; 799 } else { 800 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 801 wildcard++; 802 } 803 if (wildcard < matchwild) { 804 match = inp; 805 matchwild = wildcard; 806 if (matchwild == 0) { 807 break; 808 } 809 } 810 } 811 } 812 return (match); 813 } 814 } 815 816 void 817 in6_pcbpurgeif0(head, ifp) 818 struct in6pcb *head; 819 struct ifnet *ifp; 820 { 821 struct in6pcb *in6p; 822 struct ip6_moptions *im6o; 823 struct in6_multi_mship *imm, *nimm; 824 825 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 826 im6o = in6p->in6p_moptions; 827 if ((in6p->inp_vflag & INP_IPV6) && 828 im6o) { 829 /* 830 * Unselect the outgoing interface if it is being 831 * detached. 832 */ 833 if (im6o->im6o_multicast_ifp == ifp) 834 im6o->im6o_multicast_ifp = NULL; 835 836 /* 837 * Drop multicast group membership if we joined 838 * through the interface being detached. 839 * XXX controversial - is it really legal for kernel 840 * to force this? 841 */ 842 for (imm = im6o->im6o_memberships.lh_first; 843 imm != NULL; imm = nimm) { 844 nimm = imm->i6mm_chain.le_next; 845 if (imm->i6mm_maddr->in6m_ifp == ifp) { 846 LIST_REMOVE(imm, i6mm_chain); 847 in6_delmulti(imm->i6mm_maddr); 848 free(imm, M_IP6MADDR); 849 } 850 } 851 } 852 } 853 } 854 855 /* 856 * Check for alternatives when higher level complains 857 * about service problems. For now, invalidate cached 858 * routing information. If the route was created dynamically 859 * (by a redirect), time to try a default gateway again. 860 */ 861 void 862 in6_losing(in6p) 863 struct inpcb *in6p; 864 { 865 /* 866 * We don't store route pointers in the routing table anymore 867 */ 868 return; 869 } 870 871 /* 872 * After a routing change, flush old routing 873 * and allocate a (hopefully) better one. 874 */ 875 struct inpcb * 876 in6_rtchange(inp, errno) 877 struct inpcb *inp; 878 int errno; 879 { 880 /* 881 * We don't store route pointers in the routing table anymore 882 */ 883 return inp; 884 } 885 886 /* 887 * Lookup PCB in hash list. 888 */ 889 struct inpcb * 890 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 891 struct inpcbinfo *pcbinfo; 892 struct in6_addr *faddr, *laddr; 893 u_int fport_arg, lport_arg; 894 int wildcard; 895 struct ifnet *ifp; 896 { 897 struct inpcbhead *head; 898 register struct inpcb *inp; 899 u_short fport = fport_arg, lport = lport_arg; 900 int faith; 901 902 if (faithprefix_p != NULL) 903 faith = (*faithprefix_p)(laddr); 904 else 905 faith = 0; 906 907 /* 908 * First look for an exact match. 909 */ 910 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 911 lport, fport, 912 pcbinfo->hashmask)]; 913 LIST_FOREACH(inp, head, inp_hash) { 914 if ((inp->inp_vflag & INP_IPV6) == 0) 915 continue; 916 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 917 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 918 inp->inp_fport == fport && 919 inp->inp_lport == lport) { 920 /* 921 * Found. 922 */ 923 return (inp); 924 } 925 } 926 if (wildcard) { 927 struct inpcb *local_wild = NULL; 928 929 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 930 pcbinfo->hashmask)]; 931 LIST_FOREACH(inp, head, inp_hash) { 932 if ((inp->inp_vflag & INP_IPV6) == 0) 933 continue; 934 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 935 inp->inp_lport == lport) { 936 if (faith && (inp->inp_flags & INP_FAITH) == 0) 937 continue; 938 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 939 laddr)) 940 return (inp); 941 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 942 local_wild = inp; 943 } 944 } 945 return (local_wild); 946 } 947 948 /* 949 * Not found. 950 */ 951 return (NULL); 952 } 953 954 void 955 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 956 { 957 struct ip6_hdr *ip; 958 959 ip = mtod(m, struct ip6_hdr *); 960 bzero(sin6, sizeof(*sin6)); 961 sin6->sin6_len = sizeof(*sin6); 962 sin6->sin6_family = AF_INET6; 963 sin6->sin6_addr = ip->ip6_src; 964 965 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 966 967 return; 968 }
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