1 /* $FreeBSD$ */ 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> 99 100 #ifdef IPSEC 101 #include <netinet6/ipsec.h> 102 #ifdef INET6 103 #include <netinet6/ipsec6.h> 104 #endif 105 #include <netinet6/ah.h> 106 #ifdef INET6 107 #include <netinet6/ah6.h> 108 #endif 109 #include <netkey/key.h> 110 #endif /* IPSEC */ 111 112 #ifdef FAST_IPSEC 113 #include <netipsec/ipsec.h> 114 #include <netipsec/ipsec6.h> 115 #include <netipsec/key.h> 116 #endif /* FAST_IPSEC */ 117 118 struct in6_addr zeroin6_addr; 119 120 int 121 in6_pcbbind(inp, nam, cred) 122 register struct inpcb *inp; 123 struct sockaddr *nam; 124 struct ucred *cred; 125 { 126 struct socket *so = inp->inp_socket; 127 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 128 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 129 u_short lport = 0; 130 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 131 132 INP_INFO_WLOCK_ASSERT(pcbinfo); 133 INP_LOCK_ASSERT(inp); 134 135 if (!in6_ifaddr) /* XXX broken! */ 136 return (EADDRNOTAVAIL); 137 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 138 return (EINVAL); 139 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 140 wild = 1; 141 if (nam) { 142 sin6 = (struct sockaddr_in6 *)nam; 143 if (nam->sa_len != sizeof(*sin6)) 144 return (EINVAL); 145 /* 146 * family check. 147 */ 148 if (nam->sa_family != AF_INET6) 149 return (EAFNOSUPPORT); 150 151 /* KAME hack: embed scopeid */ 152 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 153 return EINVAL; 154 /* this must be cleared for ifa_ifwithaddr() */ 155 sin6->sin6_scope_id = 0; 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 struct ifnet *ifp = NULL; 296 int error = 0; 297 298 if (nam->sa_len != sizeof (*sin6)) 299 return (EINVAL); 300 if (sin6->sin6_family != AF_INET6) 301 return (EAFNOSUPPORT); 302 if (sin6->sin6_port == 0) 303 return (EADDRNOTAVAIL); 304 305 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 306 INP_LOCK_ASSERT(inp); 307 308 /* KAME hack: embed scopeid */ 309 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 310 return EINVAL; 311 312 if (in6_ifaddr) { 313 /* 314 * If the destination address is UNSPECIFIED addr, 315 * use the loopback addr, e.g ::1. 316 */ 317 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 318 sin6->sin6_addr = in6addr_loopback; 319 } 320 { 321 /* 322 * XXX: in6_selectsrc might replace the bound local address 323 * with the address specified by setsockopt(IPV6_PKTINFO). 324 * Is it the intended behavior? 325 */ 326 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 327 inp->in6p_moptions, NULL, 328 &inp->in6p_laddr, &error); 329 if (*plocal_addr6 == 0) { 330 if (error == 0) 331 error = EADDRNOTAVAIL; 332 return (error); 333 } 334 /* 335 * Don't do pcblookup call here; return interface in 336 * plocal_addr6 337 * and exit to caller, that will do the lookup. 338 */ 339 } 340 return (0); 341 } 342 343 /* 344 * Outer subroutine: 345 * Connect from a socket to a specified address. 346 * Both address and port must be specified in argument sin. 347 * If don't have a local address for this socket yet, 348 * then pick one. 349 */ 350 int 351 in6_pcbconnect(inp, nam, cred) 352 register struct inpcb *inp; 353 struct sockaddr *nam; 354 struct ucred *cred; 355 { 356 struct in6_addr *addr6; 357 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 358 int error; 359 360 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 361 INP_LOCK_ASSERT(inp); 362 363 /* 364 * Call inner routine, to assign local interface address. 365 * in6_pcbladdr() may automatically fill in sin6_scope_id. 366 */ 367 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 368 return (error); 369 370 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 371 sin6->sin6_port, 372 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 373 ? addr6 : &inp->in6p_laddr, 374 inp->inp_lport, 0, NULL) != NULL) { 375 return (EADDRINUSE); 376 } 377 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 378 if (inp->inp_lport == 0) { 379 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 380 if (error) 381 return (error); 382 } 383 inp->in6p_laddr = *addr6; 384 } 385 inp->in6p_faddr = sin6->sin6_addr; 386 inp->inp_fport = sin6->sin6_port; 387 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 388 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 389 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 390 inp->in6p_flowinfo |= 391 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 392 393 in_pcbrehash(inp); 394 #ifdef IPSEC 395 if (inp->inp_socket->so_type == SOCK_STREAM) 396 ipsec_pcbconn(inp->inp_sp); 397 #endif 398 return (0); 399 } 400 401 void 402 in6_pcbdisconnect(inp) 403 struct inpcb *inp; 404 { 405 406 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 407 INP_LOCK_ASSERT(inp); 408 409 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 410 inp->inp_fport = 0; 411 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 412 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 413 in_pcbrehash(inp); 414 #ifdef IPSEC 415 ipsec_pcbdisconn(inp->inp_sp); 416 #endif 417 if (inp->inp_socket->so_state & SS_NOFDREF) 418 in6_pcbdetach(inp); 419 } 420 421 void 422 in6_pcbdetach(inp) 423 struct inpcb *inp; 424 { 425 struct socket *so = inp->inp_socket; 426 struct inpcbinfo *ipi = inp->inp_pcbinfo; 427 428 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 429 INP_LOCK_ASSERT(inp); 430 431 #if defined(IPSEC) || defined(FAST_IPSEC) 432 if (inp->in6p_sp != NULL) 433 ipsec6_delete_pcbpolicy(inp); 434 #endif /* IPSEC */ 435 inp->inp_gencnt = ++ipi->ipi_gencnt; 436 in_pcbremlists(inp); 437 438 if (so) { 439 ACCEPT_LOCK(); 440 SOCK_LOCK(so); 441 so->so_pcb = NULL; 442 sotryfree(so); 443 } 444 445 ip6_freepcbopts(inp->in6p_outputopts); 446 ip6_freemoptions(inp->in6p_moptions); 447 /* Check and free IPv4 related resources in case of mapped addr */ 448 if (inp->inp_options) 449 (void)m_free(inp->inp_options); 450 ip_freemoptions(inp->inp_moptions); 451 inp->inp_vflag = 0; 452 INP_LOCK_DESTROY(inp); 453 uma_zfree(ipi->ipi_zone, inp); 454 } 455 456 struct sockaddr * 457 in6_sockaddr(port, addr_p) 458 in_port_t port; 459 struct in6_addr *addr_p; 460 { 461 struct sockaddr_in6 *sin6; 462 463 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 464 bzero(sin6, sizeof *sin6); 465 sin6->sin6_family = AF_INET6; 466 sin6->sin6_len = sizeof(*sin6); 467 sin6->sin6_port = port; 468 sin6->sin6_addr = *addr_p; 469 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 470 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 471 else 472 sin6->sin6_scope_id = 0; /*XXX*/ 473 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 474 sin6->sin6_addr.s6_addr16[1] = 0; 475 476 return (struct sockaddr *)sin6; 477 } 478 479 struct sockaddr * 480 in6_v4mapsin6_sockaddr(port, addr_p) 481 in_port_t port; 482 struct in_addr *addr_p; 483 { 484 struct sockaddr_in sin; 485 struct sockaddr_in6 *sin6_p; 486 487 bzero(&sin, sizeof sin); 488 sin.sin_family = AF_INET; 489 sin.sin_len = sizeof(sin); 490 sin.sin_port = port; 491 sin.sin_addr = *addr_p; 492 493 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 494 M_WAITOK); 495 in6_sin_2_v4mapsin6(&sin, sin6_p); 496 497 return (struct sockaddr *)sin6_p; 498 } 499 500 /* 501 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 502 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 503 * in struct pr_usrreqs, so that protocols can just reference then directly 504 * without the need for a wrapper function. The socket must have a valid 505 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 506 * except through a kernel programming error, so it is acceptable to panic 507 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 508 * because there actually /is/ a programming error somewhere... XXX) 509 */ 510 int 511 in6_setsockaddr(so, nam) 512 struct socket *so; 513 struct sockaddr **nam; 514 { 515 int s; 516 register struct inpcb *inp; 517 struct in6_addr addr; 518 in_port_t port; 519 520 s = splnet(); 521 inp = sotoinpcb(so); 522 if (!inp) { 523 splx(s); 524 return EINVAL; 525 } 526 port = inp->inp_lport; 527 addr = inp->in6p_laddr; 528 splx(s); 529 530 *nam = in6_sockaddr(port, &addr); 531 return 0; 532 } 533 534 int 535 in6_setpeeraddr(so, nam) 536 struct socket *so; 537 struct sockaddr **nam; 538 { 539 int s; 540 struct inpcb *inp; 541 struct in6_addr addr; 542 in_port_t port; 543 544 s = splnet(); 545 inp = sotoinpcb(so); 546 if (!inp) { 547 splx(s); 548 return EINVAL; 549 } 550 port = inp->inp_fport; 551 addr = inp->in6p_faddr; 552 splx(s); 553 554 *nam = in6_sockaddr(port, &addr); 555 return 0; 556 } 557 558 int 559 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 560 { 561 struct inpcb *inp = sotoinpcb(so); 562 int error; 563 564 if (inp == NULL) 565 return EINVAL; 566 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 567 error = in_setsockaddr(so, nam, &tcbinfo); 568 if (error == 0) 569 in6_sin_2_v4mapsin6_in_sock(nam); 570 } else { 571 /* scope issues will be handled in in6_setsockaddr(). */ 572 error = in6_setsockaddr(so, nam); 573 } 574 575 return error; 576 } 577 578 int 579 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 580 { 581 struct inpcb *inp = sotoinpcb(so); 582 int error; 583 584 if (inp == NULL) 585 return EINVAL; 586 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 587 error = in_setpeeraddr(so, nam, &tcbinfo); 588 if (error == 0) 589 in6_sin_2_v4mapsin6_in_sock(nam); 590 } else 591 /* scope issues will be handled in in6_setpeeraddr(). */ 592 error = in6_setpeeraddr(so, nam); 593 594 return error; 595 } 596 597 /* 598 * Pass some notification to all connections of a protocol 599 * associated with address dst. The local address and/or port numbers 600 * may be specified to limit the search. The "usual action" will be 601 * taken, depending on the ctlinput cmd. The caller must filter any 602 * cmds that are uninteresting (e.g., no error in the map). 603 * Call the protocol specific routine (if any) to report 604 * any errors for each matching socket. 605 * 606 * Must be called at splnet. 607 */ 608 void 609 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 610 struct inpcbinfo *pcbinfo; 611 struct sockaddr *dst; 612 const struct sockaddr *src; 613 u_int fport_arg, lport_arg; 614 int cmd; 615 void *cmdarg; 616 struct inpcb *(*notify) __P((struct inpcb *, int)); 617 { 618 struct inpcbhead *head; 619 struct inpcb *inp, *ninp; 620 struct sockaddr_in6 sa6_src, *sa6_dst; 621 u_short fport = fport_arg, lport = lport_arg; 622 u_int32_t flowinfo; 623 int errno, s; 624 625 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 626 return; 627 628 sa6_dst = (struct sockaddr_in6 *)dst; 629 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 630 return; 631 632 /* 633 * note that src can be NULL when we get notify by local fragmentation. 634 */ 635 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 636 flowinfo = sa6_src.sin6_flowinfo; 637 638 /* 639 * Redirects go to all references to the destination, 640 * and use in6_rtchange to invalidate the route cache. 641 * Dead host indications: also use in6_rtchange to invalidate 642 * the cache, and deliver the error to all the sockets. 643 * Otherwise, if we have knowledge of the local port and address, 644 * deliver only to that socket. 645 */ 646 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 647 fport = 0; 648 lport = 0; 649 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 650 651 if (cmd != PRC_HOSTDEAD) 652 notify = in6_rtchange; 653 } 654 errno = inet6ctlerrmap[cmd]; 655 s = splnet(); 656 head = pcbinfo->listhead; 657 INP_INFO_WLOCK(pcbinfo); 658 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 659 INP_LOCK(inp); 660 ninp = LIST_NEXT(inp, inp_list); 661 662 if ((inp->inp_vflag & INP_IPV6) == 0) { 663 INP_UNLOCK(inp); 664 continue; 665 } 666 667 /* 668 * If the error designates a new path MTU for a destination 669 * and the application (associated with this socket) wanted to 670 * know the value, notify. Note that we notify for all 671 * disconnected sockets if the corresponding application 672 * wanted. This is because some UDP applications keep sending 673 * sockets disconnected. 674 * XXX: should we avoid to notify the value to TCP sockets? 675 */ 676 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 677 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 678 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 679 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 680 (u_int32_t *)cmdarg); 681 } 682 683 /* 684 * Detect if we should notify the error. If no source and 685 * destination ports are specifed, but non-zero flowinfo and 686 * local address match, notify the error. This is the case 687 * when the error is delivered with an encrypted buffer 688 * by ESP. Otherwise, just compare addresses and ports 689 * as usual. 690 */ 691 if (lport == 0 && fport == 0 && flowinfo && 692 inp->inp_socket != NULL && 693 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 694 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 695 goto do_notify; 696 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 697 &sa6_dst->sin6_addr) || 698 inp->inp_socket == 0 || 699 (lport && inp->inp_lport != lport) || 700 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 701 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 702 &sa6_src.sin6_addr)) || 703 (fport && inp->inp_fport != fport)) { 704 INP_UNLOCK(inp); 705 continue; 706 } 707 708 do_notify: 709 if (notify) { 710 if ((*notify)(inp, errno)) 711 INP_UNLOCK(inp); 712 } else 713 INP_UNLOCK(inp); 714 } 715 INP_INFO_WUNLOCK(pcbinfo); 716 splx(s); 717 } 718 719 /* 720 * Lookup a PCB based on the local address and port. 721 */ 722 struct inpcb * 723 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 724 struct inpcbinfo *pcbinfo; 725 struct in6_addr *laddr; 726 u_int lport_arg; 727 int wild_okay; 728 { 729 register struct inpcb *inp; 730 int matchwild = 3, wildcard; 731 u_short lport = lport_arg; 732 733 if (!wild_okay) { 734 struct inpcbhead *head; 735 /* 736 * Look for an unconnected (wildcard foreign addr) PCB that 737 * matches the local address and port we're looking for. 738 */ 739 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 740 pcbinfo->hashmask)]; 741 LIST_FOREACH(inp, head, inp_hash) { 742 if ((inp->inp_vflag & INP_IPV6) == 0) 743 continue; 744 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 745 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 746 inp->inp_lport == lport) { 747 /* 748 * Found. 749 */ 750 return (inp); 751 } 752 } 753 /* 754 * Not found. 755 */ 756 return (NULL); 757 } else { 758 struct inpcbporthead *porthash; 759 struct inpcbport *phd; 760 struct inpcb *match = NULL; 761 /* 762 * Best fit PCB lookup. 763 * 764 * First see if this local port is in use by looking on the 765 * port hash list. 766 */ 767 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 768 pcbinfo->porthashmask)]; 769 LIST_FOREACH(phd, porthash, phd_hash) { 770 if (phd->phd_port == lport) 771 break; 772 } 773 if (phd != NULL) { 774 /* 775 * Port is in use by one or more PCBs. Look for best 776 * fit. 777 */ 778 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 779 wildcard = 0; 780 if ((inp->inp_vflag & INP_IPV6) == 0) 781 continue; 782 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 783 wildcard++; 784 if (!IN6_IS_ADDR_UNSPECIFIED( 785 &inp->in6p_laddr)) { 786 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 787 wildcard++; 788 else if (!IN6_ARE_ADDR_EQUAL( 789 &inp->in6p_laddr, laddr)) 790 continue; 791 } else { 792 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 793 wildcard++; 794 } 795 if (wildcard < matchwild) { 796 match = inp; 797 matchwild = wildcard; 798 if (matchwild == 0) { 799 break; 800 } 801 } 802 } 803 } 804 return (match); 805 } 806 } 807 808 void 809 in6_pcbpurgeif0(head, ifp) 810 struct in6pcb *head; 811 struct ifnet *ifp; 812 { 813 struct in6pcb *in6p; 814 struct ip6_moptions *im6o; 815 struct in6_multi_mship *imm, *nimm; 816 817 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 818 im6o = in6p->in6p_moptions; 819 if ((in6p->inp_vflag & INP_IPV6) && 820 im6o) { 821 /* 822 * Unselect the outgoing interface if it is being 823 * detached. 824 */ 825 if (im6o->im6o_multicast_ifp == ifp) 826 im6o->im6o_multicast_ifp = NULL; 827 828 /* 829 * Drop multicast group membership if we joined 830 * through the interface being detached. 831 * XXX controversial - is it really legal for kernel 832 * to force this? 833 */ 834 for (imm = im6o->im6o_memberships.lh_first; 835 imm != NULL; imm = nimm) { 836 nimm = imm->i6mm_chain.le_next; 837 if (imm->i6mm_maddr->in6m_ifp == ifp) { 838 LIST_REMOVE(imm, i6mm_chain); 839 in6_delmulti(imm->i6mm_maddr); 840 free(imm, M_IPMADDR); 841 } 842 } 843 } 844 } 845 } 846 847 /* 848 * Check for alternatives when higher level complains 849 * about service problems. For now, invalidate cached 850 * routing information. If the route was created dynamically 851 * (by a redirect), time to try a default gateway again. 852 */ 853 void 854 in6_losing(in6p) 855 struct inpcb *in6p; 856 { 857 /* 858 * We don't store route pointers in the routing table anymore 859 */ 860 return; 861 } 862 863 /* 864 * After a routing change, flush old routing 865 * and allocate a (hopefully) better one. 866 */ 867 struct inpcb * 868 in6_rtchange(inp, errno) 869 struct inpcb *inp; 870 int errno; 871 { 872 /* 873 * We don't store route pointers in the routing table anymore 874 */ 875 return inp; 876 } 877 878 /* 879 * Lookup PCB in hash list. 880 */ 881 struct inpcb * 882 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 883 struct inpcbinfo *pcbinfo; 884 struct in6_addr *faddr, *laddr; 885 u_int fport_arg, lport_arg; 886 int wildcard; 887 struct ifnet *ifp; 888 { 889 struct inpcbhead *head; 890 register struct inpcb *inp; 891 u_short fport = fport_arg, lport = lport_arg; 892 int faith; 893 894 if (faithprefix_p != NULL) 895 faith = (*faithprefix_p)(laddr); 896 else 897 faith = 0; 898 899 /* 900 * First look for an exact match. 901 */ 902 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 903 lport, fport, 904 pcbinfo->hashmask)]; 905 LIST_FOREACH(inp, head, inp_hash) { 906 if ((inp->inp_vflag & INP_IPV6) == 0) 907 continue; 908 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 909 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 910 inp->inp_fport == fport && 911 inp->inp_lport == lport) { 912 /* 913 * Found. 914 */ 915 return (inp); 916 } 917 } 918 if (wildcard) { 919 struct inpcb *local_wild = NULL; 920 921 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 922 pcbinfo->hashmask)]; 923 LIST_FOREACH(inp, head, inp_hash) { 924 if ((inp->inp_vflag & INP_IPV6) == 0) 925 continue; 926 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 927 inp->inp_lport == lport) { 928 if (faith && (inp->inp_flags & INP_FAITH) == 0) 929 continue; 930 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 931 laddr)) 932 return (inp); 933 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 934 local_wild = inp; 935 } 936 } 937 return (local_wild); 938 } 939 940 /* 941 * Not found. 942 */ 943 return (NULL); 944 } 945 946 void 947 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 948 { 949 struct ip6_hdr *ip; 950 951 ip = mtod(m, struct ip6_hdr *); 952 bzero(sin6, sizeof(*sin6)); 953 sin6->sin6_len = sizeof(*sin6); 954 sin6->sin6_family = AF_INET6; 955 sin6->sin6_addr = ip->ip6_src; 956 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 957 sin6->sin6_addr.s6_addr16[1] = 0; 958 sin6->sin6_scope_id = 959 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 960 ? m->m_pkthdr.rcvif->if_index : 0; 961 962 return; 963 } 964