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sys/netinet6/in6_pcb.c
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1 /* $FreeBSD: releng/6.2/sys/netinet6/in6_pcb.c 161984 2006-09-04 10:33:44Z pjd $ */ 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) <= ipport_reservedhigh && 192 ntohs(lport) >= ipport_reservedlow && 193 suser_cred(cred, SUSER_ALLOWJAIL)) 194 return (EACCES); 195 if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && 196 suser_cred(so->so_cred, SUSER_ALLOWJAIL) != 0) { 197 t = in6_pcblookup_local(pcbinfo, 198 &sin6->sin6_addr, lport, 199 INPLOOKUP_WILDCARD); 200 if (t && 201 ((t->inp_vflag & INP_TIMEWAIT) == 0) && 202 (so->so_type != SOCK_STREAM || 203 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 204 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 205 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 206 (t->inp_socket->so_options & SO_REUSEPORT) 207 == 0) && (so->so_cred->cr_uid != 208 t->inp_socket->so_cred->cr_uid)) 209 return (EADDRINUSE); 210 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 211 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 212 struct sockaddr_in sin; 213 214 in6_sin6_2_sin(&sin, sin6); 215 t = in_pcblookup_local(pcbinfo, 216 sin.sin_addr, lport, 217 INPLOOKUP_WILDCARD); 218 if (t && 219 ((t->inp_vflag & 220 INP_TIMEWAIT) == 0) && 221 (so->so_type != SOCK_STREAM || 222 ntohl(t->inp_faddr.s_addr) == 223 INADDR_ANY) && 224 (so->so_cred->cr_uid != 225 t->inp_socket->so_cred->cr_uid)) 226 return (EADDRINUSE); 227 } 228 } 229 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 230 lport, wild); 231 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 232 intotw(t)->tw_so_options : 233 t->inp_socket->so_options)) == 0) 234 return (EADDRINUSE); 235 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 236 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 237 struct sockaddr_in sin; 238 239 in6_sin6_2_sin(&sin, sin6); 240 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 241 lport, wild); 242 if (t && t->inp_vflag & INP_TIMEWAIT) { 243 if ((reuseport & 244 intotw(t)->tw_so_options) == 0 && 245 (ntohl(t->inp_laddr.s_addr) != 246 INADDR_ANY || ((inp->inp_vflag & 247 INP_IPV6PROTO) == 248 (t->inp_vflag & INP_IPV6PROTO)))) 249 return (EADDRINUSE); 250 } 251 else if (t && 252 (reuseport & t->inp_socket->so_options) 253 == 0 && (ntohl(t->inp_laddr.s_addr) != 254 INADDR_ANY || INP_SOCKAF(so) == 255 INP_SOCKAF(t->inp_socket))) 256 return (EADDRINUSE); 257 } 258 } 259 inp->in6p_laddr = sin6->sin6_addr; 260 } 261 if (lport == 0) { 262 int e; 263 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 264 return (e); 265 } 266 else { 267 inp->inp_lport = lport; 268 if (in_pcbinshash(inp) != 0) { 269 inp->in6p_laddr = in6addr_any; 270 inp->inp_lport = 0; 271 return (EAGAIN); 272 } 273 } 274 return (0); 275 } 276 277 /* 278 * Transform old in6_pcbconnect() into an inner subroutine for new 279 * in6_pcbconnect(): Do some validity-checking on the remote 280 * address (in mbuf 'nam') and then determine local host address 281 * (i.e., which interface) to use to access that remote host. 282 * 283 * This preserves definition of in6_pcbconnect(), while supporting a 284 * slightly different version for T/TCP. (This is more than 285 * a bit of a kludge, but cleaning up the internal interfaces would 286 * have forced minor changes in every protocol). 287 */ 288 289 int 290 in6_pcbladdr(inp, nam, plocal_addr6) 291 register struct inpcb *inp; 292 struct sockaddr *nam; 293 struct in6_addr **plocal_addr6; 294 { 295 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 296 int error = 0; 297 struct ifnet *ifp = NULL; 298 int scope_ambiguous = 0; 299 300 if (nam->sa_len != sizeof (*sin6)) 301 return (EINVAL); 302 if (sin6->sin6_family != AF_INET6) 303 return (EAFNOSUPPORT); 304 if (sin6->sin6_port == 0) 305 return (EADDRNOTAVAIL); 306 307 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) 308 scope_ambiguous = 1; 309 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) 310 return(error); 311 312 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 313 INP_LOCK_ASSERT(inp); 314 315 if (in6_ifaddr) { 316 /* 317 * If the destination address is UNSPECIFIED addr, 318 * use the loopback addr, e.g ::1. 319 */ 320 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 321 sin6->sin6_addr = in6addr_loopback; 322 } 323 324 /* 325 * XXX: in6_selectsrc might replace the bound local address 326 * with the address specified by setsockopt(IPV6_PKTINFO). 327 * Is it the intended behavior? 328 */ 329 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 330 inp->in6p_moptions, NULL, 331 &inp->in6p_laddr, &ifp, &error); 332 if (ifp && scope_ambiguous && 333 (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { 334 return(error); 335 } 336 337 if (*plocal_addr6 == 0) { 338 if (error == 0) 339 error = EADDRNOTAVAIL; 340 return (error); 341 } 342 /* 343 * Don't do pcblookup call here; return interface in 344 * plocal_addr6 345 * and exit to caller, that will do the lookup. 346 */ 347 348 return (0); 349 } 350 351 /* 352 * Outer subroutine: 353 * Connect from a socket to a specified address. 354 * Both address and port must be specified in argument sin. 355 * If don't have a local address for this socket yet, 356 * then pick one. 357 */ 358 int 359 in6_pcbconnect(inp, nam, cred) 360 register struct inpcb *inp; 361 struct sockaddr *nam; 362 struct ucred *cred; 363 { 364 struct in6_addr *addr6; 365 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 366 int error; 367 368 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 369 INP_LOCK_ASSERT(inp); 370 371 /* 372 * Call inner routine, to assign local interface address. 373 * in6_pcbladdr() may automatically fill in sin6_scope_id. 374 */ 375 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 376 return (error); 377 378 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 379 sin6->sin6_port, 380 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 381 ? addr6 : &inp->in6p_laddr, 382 inp->inp_lport, 0, NULL) != NULL) { 383 return (EADDRINUSE); 384 } 385 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 386 if (inp->inp_lport == 0) { 387 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 388 if (error) 389 return (error); 390 } 391 inp->in6p_laddr = *addr6; 392 } 393 inp->in6p_faddr = sin6->sin6_addr; 394 inp->inp_fport = sin6->sin6_port; 395 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 396 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 397 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 398 inp->in6p_flowinfo |= 399 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 400 401 in_pcbrehash(inp); 402 #ifdef IPSEC 403 if (inp->inp_socket->so_type == SOCK_STREAM) 404 ipsec_pcbconn(inp->inp_sp); 405 #endif 406 return (0); 407 } 408 409 void 410 in6_pcbdisconnect(inp) 411 struct inpcb *inp; 412 { 413 414 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 415 INP_LOCK_ASSERT(inp); 416 417 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 418 inp->inp_fport = 0; 419 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 420 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 421 in_pcbrehash(inp); 422 #ifdef IPSEC 423 ipsec_pcbdisconn(inp->inp_sp); 424 #endif 425 if (inp->inp_socket->so_state & SS_NOFDREF) 426 in6_pcbdetach(inp); 427 } 428 429 void 430 in6_pcbdetach(inp) 431 struct inpcb *inp; 432 { 433 struct socket *so = inp->inp_socket; 434 struct inpcbinfo *ipi = inp->inp_pcbinfo; 435 436 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 437 INP_LOCK_ASSERT(inp); 438 439 #if defined(IPSEC) || defined(FAST_IPSEC) 440 if (inp->in6p_sp != NULL) 441 ipsec6_delete_pcbpolicy(inp); 442 #endif /* IPSEC */ 443 inp->inp_gencnt = ++ipi->ipi_gencnt; 444 in_pcbremlists(inp); 445 446 if (so) { 447 ACCEPT_LOCK(); 448 SOCK_LOCK(so); 449 so->so_pcb = NULL; 450 sotryfree(so); 451 } 452 453 ip6_freepcbopts(inp->in6p_outputopts); 454 ip6_freemoptions(inp->in6p_moptions); 455 /* Check and free IPv4 related resources in case of mapped addr */ 456 if (inp->inp_options) 457 (void)m_free(inp->inp_options); 458 ip_freemoptions(inp->inp_moptions); 459 inp->inp_vflag = 0; 460 INP_LOCK_DESTROY(inp); 461 uma_zfree(ipi->ipi_zone, inp); 462 } 463 464 struct sockaddr * 465 in6_sockaddr(port, addr_p) 466 in_port_t port; 467 struct in6_addr *addr_p; 468 { 469 struct sockaddr_in6 *sin6; 470 471 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 472 bzero(sin6, sizeof *sin6); 473 sin6->sin6_family = AF_INET6; 474 sin6->sin6_len = sizeof(*sin6); 475 sin6->sin6_port = port; 476 sin6->sin6_addr = *addr_p; 477 (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ 478 479 return (struct sockaddr *)sin6; 480 } 481 482 struct sockaddr * 483 in6_v4mapsin6_sockaddr(port, addr_p) 484 in_port_t port; 485 struct in_addr *addr_p; 486 { 487 struct sockaddr_in sin; 488 struct sockaddr_in6 *sin6_p; 489 490 bzero(&sin, sizeof sin); 491 sin.sin_family = AF_INET; 492 sin.sin_len = sizeof(sin); 493 sin.sin_port = port; 494 sin.sin_addr = *addr_p; 495 496 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 497 M_WAITOK); 498 in6_sin_2_v4mapsin6(&sin, sin6_p); 499 500 return (struct sockaddr *)sin6_p; 501 } 502 503 /* 504 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 505 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 506 * in struct pr_usrreqs, so that protocols can just reference then directly 507 * without the need for a wrapper function. The socket must have a valid 508 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 509 * except through a kernel programming error, so it is acceptable to panic 510 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 511 * because there actually /is/ a programming error somewhere... XXX) 512 */ 513 int 514 in6_setsockaddr(so, nam) 515 struct socket *so; 516 struct sockaddr **nam; 517 { 518 int s; 519 register struct inpcb *inp; 520 struct in6_addr addr; 521 in_port_t port; 522 523 s = splnet(); 524 inp = sotoinpcb(so); 525 if (!inp) { 526 splx(s); 527 return EINVAL; 528 } 529 port = inp->inp_lport; 530 addr = inp->in6p_laddr; 531 splx(s); 532 533 *nam = in6_sockaddr(port, &addr); 534 return 0; 535 } 536 537 int 538 in6_setpeeraddr(so, nam) 539 struct socket *so; 540 struct sockaddr **nam; 541 { 542 int s; 543 struct inpcb *inp; 544 struct in6_addr addr; 545 in_port_t port; 546 547 s = splnet(); 548 inp = sotoinpcb(so); 549 if (!inp) { 550 splx(s); 551 return EINVAL; 552 } 553 port = inp->inp_fport; 554 addr = inp->in6p_faddr; 555 splx(s); 556 557 *nam = in6_sockaddr(port, &addr); 558 return 0; 559 } 560 561 int 562 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 563 { 564 struct inpcb *inp = sotoinpcb(so); 565 int error; 566 567 if (inp == NULL) 568 return EINVAL; 569 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 570 error = in_setsockaddr(so, nam, &tcbinfo); 571 if (error == 0) 572 in6_sin_2_v4mapsin6_in_sock(nam); 573 } else { 574 /* scope issues will be handled in in6_setsockaddr(). */ 575 error = in6_setsockaddr(so, nam); 576 } 577 578 return error; 579 } 580 581 int 582 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 583 { 584 struct inpcb *inp = sotoinpcb(so); 585 int error; 586 587 if (inp == NULL) 588 return EINVAL; 589 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 590 error = in_setpeeraddr(so, nam, &tcbinfo); 591 if (error == 0) 592 in6_sin_2_v4mapsin6_in_sock(nam); 593 } else 594 /* scope issues will be handled in in6_setpeeraddr(). */ 595 error = in6_setpeeraddr(so, nam); 596 597 return error; 598 } 599 600 /* 601 * Pass some notification to all connections of a protocol 602 * associated with address dst. The local address and/or port numbers 603 * may be specified to limit the search. The "usual action" will be 604 * taken, depending on the ctlinput cmd. The caller must filter any 605 * cmds that are uninteresting (e.g., no error in the map). 606 * Call the protocol specific routine (if any) to report 607 * any errors for each matching socket. 608 * 609 * Must be called at splnet. 610 */ 611 void 612 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 613 struct inpcbinfo *pcbinfo; 614 struct sockaddr *dst; 615 const struct sockaddr *src; 616 u_int fport_arg, lport_arg; 617 int cmd; 618 void *cmdarg; 619 struct inpcb *(*notify) __P((struct inpcb *, int)); 620 { 621 struct inpcbhead *head; 622 struct inpcb *inp, *ninp; 623 struct sockaddr_in6 sa6_src, *sa6_dst; 624 u_short fport = fport_arg, lport = lport_arg; 625 u_int32_t flowinfo; 626 int errno, s; 627 628 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 629 return; 630 631 sa6_dst = (struct sockaddr_in6 *)dst; 632 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 633 return; 634 635 /* 636 * note that src can be NULL when we get notify by local fragmentation. 637 */ 638 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 639 flowinfo = sa6_src.sin6_flowinfo; 640 641 /* 642 * Redirects go to all references to the destination, 643 * and use in6_rtchange to invalidate the route cache. 644 * Dead host indications: also use in6_rtchange to invalidate 645 * the cache, and deliver the error to all the sockets. 646 * Otherwise, if we have knowledge of the local port and address, 647 * deliver only to that socket. 648 */ 649 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 650 fport = 0; 651 lport = 0; 652 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 653 654 if (cmd != PRC_HOSTDEAD) 655 notify = in6_rtchange; 656 } 657 errno = inet6ctlerrmap[cmd]; 658 s = splnet(); 659 head = pcbinfo->listhead; 660 INP_INFO_WLOCK(pcbinfo); 661 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 662 INP_LOCK(inp); 663 ninp = LIST_NEXT(inp, inp_list); 664 665 if ((inp->inp_vflag & INP_IPV6) == 0) { 666 INP_UNLOCK(inp); 667 continue; 668 } 669 670 /* 671 * If the error designates a new path MTU for a destination 672 * and the application (associated with this socket) wanted to 673 * know the value, notify. Note that we notify for all 674 * disconnected sockets if the corresponding application 675 * wanted. This is because some UDP applications keep sending 676 * sockets disconnected. 677 * XXX: should we avoid to notify the value to TCP sockets? 678 */ 679 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 680 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 681 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 682 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 683 (u_int32_t *)cmdarg); 684 } 685 686 /* 687 * Detect if we should notify the error. If no source and 688 * destination ports are specifed, but non-zero flowinfo and 689 * local address match, notify the error. This is the case 690 * when the error is delivered with an encrypted buffer 691 * by ESP. Otherwise, just compare addresses and ports 692 * as usual. 693 */ 694 if (lport == 0 && fport == 0 && flowinfo && 695 inp->inp_socket != NULL && 696 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 697 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 698 goto do_notify; 699 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 700 &sa6_dst->sin6_addr) || 701 inp->inp_socket == 0 || 702 (lport && inp->inp_lport != lport) || 703 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 704 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 705 &sa6_src.sin6_addr)) || 706 (fport && inp->inp_fport != fport)) { 707 INP_UNLOCK(inp); 708 continue; 709 } 710 711 do_notify: 712 if (notify) { 713 if ((*notify)(inp, errno)) 714 INP_UNLOCK(inp); 715 } else 716 INP_UNLOCK(inp); 717 } 718 INP_INFO_WUNLOCK(pcbinfo); 719 splx(s); 720 } 721 722 /* 723 * Lookup a PCB based on the local address and port. 724 */ 725 struct inpcb * 726 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 727 struct inpcbinfo *pcbinfo; 728 struct in6_addr *laddr; 729 u_int lport_arg; 730 int wild_okay; 731 { 732 register struct inpcb *inp; 733 int matchwild = 3, wildcard; 734 u_short lport = lport_arg; 735 736 if (!wild_okay) { 737 struct inpcbhead *head; 738 /* 739 * Look for an unconnected (wildcard foreign addr) PCB that 740 * matches the local address and port we're looking for. 741 */ 742 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 743 pcbinfo->hashmask)]; 744 LIST_FOREACH(inp, head, inp_hash) { 745 if ((inp->inp_vflag & INP_IPV6) == 0) 746 continue; 747 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 748 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 749 inp->inp_lport == lport) { 750 /* 751 * Found. 752 */ 753 return (inp); 754 } 755 } 756 /* 757 * Not found. 758 */ 759 return (NULL); 760 } else { 761 struct inpcbporthead *porthash; 762 struct inpcbport *phd; 763 struct inpcb *match = NULL; 764 /* 765 * Best fit PCB lookup. 766 * 767 * First see if this local port is in use by looking on the 768 * port hash list. 769 */ 770 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 771 pcbinfo->porthashmask)]; 772 LIST_FOREACH(phd, porthash, phd_hash) { 773 if (phd->phd_port == lport) 774 break; 775 } 776 if (phd != NULL) { 777 /* 778 * Port is in use by one or more PCBs. Look for best 779 * fit. 780 */ 781 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 782 wildcard = 0; 783 if ((inp->inp_vflag & INP_IPV6) == 0) 784 continue; 785 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 786 wildcard++; 787 if (!IN6_IS_ADDR_UNSPECIFIED( 788 &inp->in6p_laddr)) { 789 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 790 wildcard++; 791 else if (!IN6_ARE_ADDR_EQUAL( 792 &inp->in6p_laddr, laddr)) 793 continue; 794 } else { 795 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 796 wildcard++; 797 } 798 if (wildcard < matchwild) { 799 match = inp; 800 matchwild = wildcard; 801 if (matchwild == 0) { 802 break; 803 } 804 } 805 } 806 } 807 return (match); 808 } 809 } 810 811 void 812 in6_pcbpurgeif0(head, ifp) 813 struct in6pcb *head; 814 struct ifnet *ifp; 815 { 816 struct in6pcb *in6p; 817 struct ip6_moptions *im6o; 818 struct in6_multi_mship *imm, *nimm; 819 820 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 821 im6o = in6p->in6p_moptions; 822 if ((in6p->inp_vflag & INP_IPV6) && 823 im6o) { 824 /* 825 * Unselect the outgoing interface if it is being 826 * detached. 827 */ 828 if (im6o->im6o_multicast_ifp == ifp) 829 im6o->im6o_multicast_ifp = NULL; 830 831 /* 832 * Drop multicast group membership if we joined 833 * through the interface being detached. 834 * XXX controversial - is it really legal for kernel 835 * to force this? 836 */ 837 for (imm = im6o->im6o_memberships.lh_first; 838 imm != NULL; imm = nimm) { 839 nimm = imm->i6mm_chain.le_next; 840 if (imm->i6mm_maddr->in6m_ifp == ifp) { 841 LIST_REMOVE(imm, i6mm_chain); 842 in6_delmulti(imm->i6mm_maddr); 843 free(imm, M_IP6MADDR); 844 } 845 } 846 } 847 } 848 } 849 850 /* 851 * Check for alternatives when higher level complains 852 * about service problems. For now, invalidate cached 853 * routing information. If the route was created dynamically 854 * (by a redirect), time to try a default gateway again. 855 */ 856 void 857 in6_losing(in6p) 858 struct inpcb *in6p; 859 { 860 /* 861 * We don't store route pointers in the routing table anymore 862 */ 863 return; 864 } 865 866 /* 867 * After a routing change, flush old routing 868 * and allocate a (hopefully) better one. 869 */ 870 struct inpcb * 871 in6_rtchange(inp, errno) 872 struct inpcb *inp; 873 int errno; 874 { 875 /* 876 * We don't store route pointers in the routing table anymore 877 */ 878 return inp; 879 } 880 881 /* 882 * Lookup PCB in hash list. 883 */ 884 struct inpcb * 885 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 886 struct inpcbinfo *pcbinfo; 887 struct in6_addr *faddr, *laddr; 888 u_int fport_arg, lport_arg; 889 int wildcard; 890 struct ifnet *ifp; 891 { 892 struct inpcbhead *head; 893 register struct inpcb *inp; 894 u_short fport = fport_arg, lport = lport_arg; 895 int faith; 896 897 if (faithprefix_p != NULL) 898 faith = (*faithprefix_p)(laddr); 899 else 900 faith = 0; 901 902 /* 903 * First look for an exact match. 904 */ 905 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 906 lport, fport, 907 pcbinfo->hashmask)]; 908 LIST_FOREACH(inp, head, inp_hash) { 909 if ((inp->inp_vflag & INP_IPV6) == 0) 910 continue; 911 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 912 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 913 inp->inp_fport == fport && 914 inp->inp_lport == lport) { 915 /* 916 * Found. 917 */ 918 return (inp); 919 } 920 } 921 if (wildcard) { 922 struct inpcb *local_wild = NULL; 923 924 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 925 pcbinfo->hashmask)]; 926 LIST_FOREACH(inp, head, inp_hash) { 927 if ((inp->inp_vflag & INP_IPV6) == 0) 928 continue; 929 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 930 inp->inp_lport == lport) { 931 if (faith && (inp->inp_flags & INP_FAITH) == 0) 932 continue; 933 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 934 laddr)) 935 return (inp); 936 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 937 local_wild = inp; 938 } 939 } 940 return (local_wild); 941 } 942 943 /* 944 * Not found. 945 */ 946 return (NULL); 947 } 948 949 void 950 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 951 { 952 struct ip6_hdr *ip; 953 954 ip = mtod(m, struct ip6_hdr *); 955 bzero(sin6, sizeof(*sin6)); 956 sin6->sin6_len = sizeof(*sin6); 957 sin6->sin6_family = AF_INET6; 958 sin6->sin6_addr = ip->ip6_src; 959 960 (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */ 961 962 return; 963 }
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