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 SOCK_LOCK(so); 440 so->so_pcb = NULL; 441 sotryfree(so); 442 } 443 444 ip6_freepcbopts(inp->in6p_outputopts); 445 ip6_freemoptions(inp->in6p_moptions); 446 /* Check and free IPv4 related resources in case of mapped addr */ 447 if (inp->inp_options) 448 (void)m_free(inp->inp_options); 449 ip_freemoptions(inp->inp_moptions); 450 inp->inp_vflag = 0; 451 INP_LOCK_DESTROY(inp); 452 uma_zfree(ipi->ipi_zone, inp); 453 } 454 455 struct sockaddr * 456 in6_sockaddr(port, addr_p) 457 in_port_t port; 458 struct in6_addr *addr_p; 459 { 460 struct sockaddr_in6 *sin6; 461 462 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 463 bzero(sin6, sizeof *sin6); 464 sin6->sin6_family = AF_INET6; 465 sin6->sin6_len = sizeof(*sin6); 466 sin6->sin6_port = port; 467 sin6->sin6_addr = *addr_p; 468 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 469 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 470 else 471 sin6->sin6_scope_id = 0; /*XXX*/ 472 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 473 sin6->sin6_addr.s6_addr16[1] = 0; 474 475 return (struct sockaddr *)sin6; 476 } 477 478 struct sockaddr * 479 in6_v4mapsin6_sockaddr(port, addr_p) 480 in_port_t port; 481 struct in_addr *addr_p; 482 { 483 struct sockaddr_in sin; 484 struct sockaddr_in6 *sin6_p; 485 486 bzero(&sin, sizeof sin); 487 sin.sin_family = AF_INET; 488 sin.sin_len = sizeof(sin); 489 sin.sin_port = port; 490 sin.sin_addr = *addr_p; 491 492 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 493 M_WAITOK); 494 in6_sin_2_v4mapsin6(&sin, sin6_p); 495 496 return (struct sockaddr *)sin6_p; 497 } 498 499 /* 500 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 501 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 502 * in struct pr_usrreqs, so that protocols can just reference then directly 503 * without the need for a wrapper function. The socket must have a valid 504 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 505 * except through a kernel programming error, so it is acceptable to panic 506 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 507 * because there actually /is/ a programming error somewhere... XXX) 508 */ 509 int 510 in6_setsockaddr(so, nam) 511 struct socket *so; 512 struct sockaddr **nam; 513 { 514 int s; 515 register struct inpcb *inp; 516 struct in6_addr addr; 517 in_port_t port; 518 519 s = splnet(); 520 inp = sotoinpcb(so); 521 if (!inp) { 522 splx(s); 523 return EINVAL; 524 } 525 port = inp->inp_lport; 526 addr = inp->in6p_laddr; 527 splx(s); 528 529 *nam = in6_sockaddr(port, &addr); 530 return 0; 531 } 532 533 int 534 in6_setpeeraddr(so, nam) 535 struct socket *so; 536 struct sockaddr **nam; 537 { 538 int s; 539 struct inpcb *inp; 540 struct in6_addr addr; 541 in_port_t port; 542 543 s = splnet(); 544 inp = sotoinpcb(so); 545 if (!inp) { 546 splx(s); 547 return EINVAL; 548 } 549 port = inp->inp_fport; 550 addr = inp->in6p_faddr; 551 splx(s); 552 553 *nam = in6_sockaddr(port, &addr); 554 return 0; 555 } 556 557 int 558 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 559 { 560 struct inpcb *inp = sotoinpcb(so); 561 int error; 562 563 if (inp == NULL) 564 return EINVAL; 565 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 566 error = in_setsockaddr(so, nam, &tcbinfo); 567 if (error == 0) 568 in6_sin_2_v4mapsin6_in_sock(nam); 569 } else { 570 /* scope issues will be handled in in6_setsockaddr(). */ 571 error = in6_setsockaddr(so, nam); 572 } 573 574 return error; 575 } 576 577 int 578 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 579 { 580 struct inpcb *inp = sotoinpcb(so); 581 int error; 582 583 if (inp == NULL) 584 return EINVAL; 585 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 586 error = in_setpeeraddr(so, nam, &tcbinfo); 587 if (error == 0) 588 in6_sin_2_v4mapsin6_in_sock(nam); 589 } else 590 /* scope issues will be handled in in6_setpeeraddr(). */ 591 error = in6_setpeeraddr(so, nam); 592 593 return error; 594 } 595 596 /* 597 * Pass some notification to all connections of a protocol 598 * associated with address dst. The local address and/or port numbers 599 * may be specified to limit the search. The "usual action" will be 600 * taken, depending on the ctlinput cmd. The caller must filter any 601 * cmds that are uninteresting (e.g., no error in the map). 602 * Call the protocol specific routine (if any) to report 603 * any errors for each matching socket. 604 * 605 * Must be called at splnet. 606 */ 607 void 608 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 609 struct inpcbinfo *pcbinfo; 610 struct sockaddr *dst; 611 const struct sockaddr *src; 612 u_int fport_arg, lport_arg; 613 int cmd; 614 void *cmdarg; 615 struct inpcb *(*notify) __P((struct inpcb *, int)); 616 { 617 struct inpcbhead *head; 618 struct inpcb *inp, *ninp; 619 struct sockaddr_in6 sa6_src, *sa6_dst; 620 u_short fport = fport_arg, lport = lport_arg; 621 u_int32_t flowinfo; 622 int errno, s; 623 624 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 625 return; 626 627 sa6_dst = (struct sockaddr_in6 *)dst; 628 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 629 return; 630 631 /* 632 * note that src can be NULL when we get notify by local fragmentation. 633 */ 634 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 635 flowinfo = sa6_src.sin6_flowinfo; 636 637 /* 638 * Redirects go to all references to the destination, 639 * and use in6_rtchange to invalidate the route cache. 640 * Dead host indications: also use in6_rtchange to invalidate 641 * the cache, and deliver the error to all the sockets. 642 * Otherwise, if we have knowledge of the local port and address, 643 * deliver only to that socket. 644 */ 645 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 646 fport = 0; 647 lport = 0; 648 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 649 650 if (cmd != PRC_HOSTDEAD) 651 notify = in6_rtchange; 652 } 653 errno = inet6ctlerrmap[cmd]; 654 s = splnet(); 655 head = pcbinfo->listhead; 656 INP_INFO_WLOCK(pcbinfo); 657 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 658 INP_LOCK(inp); 659 ninp = LIST_NEXT(inp, inp_list); 660 661 if ((inp->inp_vflag & INP_IPV6) == 0) { 662 INP_UNLOCK(inp); 663 continue; 664 } 665 666 /* 667 * If the error designates a new path MTU for a destination 668 * and the application (associated with this socket) wanted to 669 * know the value, notify. Note that we notify for all 670 * disconnected sockets if the corresponding application 671 * wanted. This is because some UDP applications keep sending 672 * sockets disconnected. 673 * XXX: should we avoid to notify the value to TCP sockets? 674 */ 675 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 676 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 677 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 678 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 679 (u_int32_t *)cmdarg); 680 } 681 682 /* 683 * Detect if we should notify the error. If no source and 684 * destination ports are specifed, but non-zero flowinfo and 685 * local address match, notify the error. This is the case 686 * when the error is delivered with an encrypted buffer 687 * by ESP. Otherwise, just compare addresses and ports 688 * as usual. 689 */ 690 if (lport == 0 && fport == 0 && flowinfo && 691 inp->inp_socket != NULL && 692 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 693 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 694 goto do_notify; 695 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 696 &sa6_dst->sin6_addr) || 697 inp->inp_socket == 0 || 698 (lport && inp->inp_lport != lport) || 699 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 700 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 701 &sa6_src.sin6_addr)) || 702 (fport && inp->inp_fport != fport)) { 703 INP_UNLOCK(inp); 704 continue; 705 } 706 707 do_notify: 708 if (notify) { 709 if ((*notify)(inp, errno)) 710 INP_UNLOCK(inp); 711 } else 712 INP_UNLOCK(inp); 713 } 714 INP_INFO_WUNLOCK(pcbinfo); 715 splx(s); 716 } 717 718 /* 719 * Lookup a PCB based on the local address and port. 720 */ 721 struct inpcb * 722 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 723 struct inpcbinfo *pcbinfo; 724 struct in6_addr *laddr; 725 u_int lport_arg; 726 int wild_okay; 727 { 728 register struct inpcb *inp; 729 int matchwild = 3, wildcard; 730 u_short lport = lport_arg; 731 732 if (!wild_okay) { 733 struct inpcbhead *head; 734 /* 735 * Look for an unconnected (wildcard foreign addr) PCB that 736 * matches the local address and port we're looking for. 737 */ 738 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 739 pcbinfo->hashmask)]; 740 LIST_FOREACH(inp, head, inp_hash) { 741 if ((inp->inp_vflag & INP_IPV6) == 0) 742 continue; 743 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 744 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 745 inp->inp_lport == lport) { 746 /* 747 * Found. 748 */ 749 return (inp); 750 } 751 } 752 /* 753 * Not found. 754 */ 755 return (NULL); 756 } else { 757 struct inpcbporthead *porthash; 758 struct inpcbport *phd; 759 struct inpcb *match = NULL; 760 /* 761 * Best fit PCB lookup. 762 * 763 * First see if this local port is in use by looking on the 764 * port hash list. 765 */ 766 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 767 pcbinfo->porthashmask)]; 768 LIST_FOREACH(phd, porthash, phd_hash) { 769 if (phd->phd_port == lport) 770 break; 771 } 772 if (phd != NULL) { 773 /* 774 * Port is in use by one or more PCBs. Look for best 775 * fit. 776 */ 777 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 778 wildcard = 0; 779 if ((inp->inp_vflag & INP_IPV6) == 0) 780 continue; 781 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 782 wildcard++; 783 if (!IN6_IS_ADDR_UNSPECIFIED( 784 &inp->in6p_laddr)) { 785 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 786 wildcard++; 787 else if (!IN6_ARE_ADDR_EQUAL( 788 &inp->in6p_laddr, laddr)) 789 continue; 790 } else { 791 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 792 wildcard++; 793 } 794 if (wildcard < matchwild) { 795 match = inp; 796 matchwild = wildcard; 797 if (matchwild == 0) { 798 break; 799 } 800 } 801 } 802 } 803 return (match); 804 } 805 } 806 807 void 808 in6_pcbpurgeif0(head, ifp) 809 struct in6pcb *head; 810 struct ifnet *ifp; 811 { 812 struct in6pcb *in6p; 813 struct ip6_moptions *im6o; 814 struct in6_multi_mship *imm, *nimm; 815 816 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 817 im6o = in6p->in6p_moptions; 818 if ((in6p->inp_vflag & INP_IPV6) && 819 im6o) { 820 /* 821 * Unselect the outgoing interface if it is being 822 * detached. 823 */ 824 if (im6o->im6o_multicast_ifp == ifp) 825 im6o->im6o_multicast_ifp = NULL; 826 827 /* 828 * Drop multicast group membership if we joined 829 * through the interface being detached. 830 * XXX controversial - is it really legal for kernel 831 * to force this? 832 */ 833 for (imm = im6o->im6o_memberships.lh_first; 834 imm != NULL; imm = nimm) { 835 nimm = imm->i6mm_chain.le_next; 836 if (imm->i6mm_maddr->in6m_ifp == ifp) { 837 LIST_REMOVE(imm, i6mm_chain); 838 in6_delmulti(imm->i6mm_maddr); 839 free(imm, M_IPMADDR); 840 } 841 } 842 } 843 } 844 } 845 846 /* 847 * Check for alternatives when higher level complains 848 * about service problems. For now, invalidate cached 849 * routing information. If the route was created dynamically 850 * (by a redirect), time to try a default gateway again. 851 */ 852 void 853 in6_losing(in6p) 854 struct inpcb *in6p; 855 { 856 /* 857 * We don't store route pointers in the routing table anymore 858 */ 859 return; 860 } 861 862 /* 863 * After a routing change, flush old routing 864 * and allocate a (hopefully) better one. 865 */ 866 struct inpcb * 867 in6_rtchange(inp, errno) 868 struct inpcb *inp; 869 int errno; 870 { 871 /* 872 * We don't store route pointers in the routing table anymore 873 */ 874 return inp; 875 } 876 877 /* 878 * Lookup PCB in hash list. 879 */ 880 struct inpcb * 881 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 882 struct inpcbinfo *pcbinfo; 883 struct in6_addr *faddr, *laddr; 884 u_int fport_arg, lport_arg; 885 int wildcard; 886 struct ifnet *ifp; 887 { 888 struct inpcbhead *head; 889 register struct inpcb *inp; 890 u_short fport = fport_arg, lport = lport_arg; 891 int faith; 892 893 if (faithprefix_p != NULL) 894 faith = (*faithprefix_p)(laddr); 895 else 896 faith = 0; 897 898 /* 899 * First look for an exact match. 900 */ 901 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 902 lport, fport, 903 pcbinfo->hashmask)]; 904 LIST_FOREACH(inp, head, inp_hash) { 905 if ((inp->inp_vflag & INP_IPV6) == 0) 906 continue; 907 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 908 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 909 inp->inp_fport == fport && 910 inp->inp_lport == lport) { 911 /* 912 * Found. 913 */ 914 return (inp); 915 } 916 } 917 if (wildcard) { 918 struct inpcb *local_wild = NULL; 919 920 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 921 pcbinfo->hashmask)]; 922 LIST_FOREACH(inp, head, inp_hash) { 923 if ((inp->inp_vflag & INP_IPV6) == 0) 924 continue; 925 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 926 inp->inp_lport == lport) { 927 if (faith && (inp->inp_flags & INP_FAITH) == 0) 928 continue; 929 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 930 laddr)) 931 return (inp); 932 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 933 local_wild = inp; 934 } 935 } 936 return (local_wild); 937 } 938 939 /* 940 * Not found. 941 */ 942 return (NULL); 943 } 944 945 void 946 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 947 { 948 struct ip6_hdr *ip; 949 950 ip = mtod(m, struct ip6_hdr *); 951 bzero(sin6, sizeof(*sin6)); 952 sin6->sin6_len = sizeof(*sin6); 953 sin6->sin6_family = AF_INET6; 954 sin6->sin6_addr = ip->ip6_src; 955 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 956 sin6->sin6_addr.s6_addr16[1] = 0; 957 sin6->sin6_scope_id = 958 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 959 ? m->m_pkthdr.rcvif->if_index : 0; 960 961 return; 962 } 963