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 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 67 */ 68 69 #include "opt_inet.h" 70 #include "opt_inet6.h" 71 #include "opt_ipsec.h" 72 #include "opt_random_ip_id.h" 73 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/malloc.h> 77 #include <sys/mbuf.h> 78 #include <sys/domain.h> 79 #include <sys/protosw.h> 80 #include <sys/socket.h> 81 #include <sys/socketvar.h> 82 #include <sys/sockio.h> 83 #include <sys/errno.h> 84 #include <sys/time.h> 85 #include <sys/proc.h> 86 #include <sys/jail.h> 87 88 #include <vm/uma.h> 89 90 #include <net/if.h> 91 #include <net/if_types.h> 92 #include <net/route.h> 93 94 #include <netinet/in.h> 95 #include <netinet/in_var.h> 96 #include <netinet/in_systm.h> 97 #include <netinet/tcp_var.h> 98 #include <netinet/ip6.h> 99 #include <netinet/ip_var.h> 100 #include <netinet6/ip6_var.h> 101 #include <netinet6/nd6.h> 102 #include <netinet/in_pcb.h> 103 #include <netinet6/in6_pcb.h> 104 105 #ifdef IPSEC 106 #include <netinet6/ipsec.h> 107 #ifdef INET6 108 #include <netinet6/ipsec6.h> 109 #endif 110 #include <netinet6/ah.h> 111 #ifdef INET6 112 #include <netinet6/ah6.h> 113 #endif 114 #include <netkey/key.h> 115 #endif /* IPSEC */ 116 117 #ifdef FAST_IPSEC 118 #include <netipsec/ipsec.h> 119 #include <netipsec/ipsec6.h> 120 #include <netipsec/key.h> 121 #define IPSEC 122 #endif /* FAST_IPSEC */ 123 124 struct in6_addr zeroin6_addr; 125 126 int 127 in6_pcbbind(inp, nam, td) 128 register struct inpcb *inp; 129 struct sockaddr *nam; 130 struct thread *td; 131 { 132 struct socket *so = inp->inp_socket; 133 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 134 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 135 u_short lport = 0; 136 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 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 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 /* KAME hack: embed scopeid */ 155 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 156 return EINVAL; 157 /* this must be cleared for ifa_ifwithaddr() */ 158 sin6->sin6_scope_id = 0; 159 160 lport = sin6->sin6_port; 161 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 162 /* 163 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 164 * allow compepte duplication of binding if 165 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 166 * and a multicast address is bound on both 167 * new and duplicated sockets. 168 */ 169 if (so->so_options & SO_REUSEADDR) 170 reuseport = SO_REUSEADDR|SO_REUSEPORT; 171 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 172 struct ifaddr *ia = NULL; 173 174 sin6->sin6_port = 0; /* yech... */ 175 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 176 return (EADDRNOTAVAIL); 177 178 /* 179 * XXX: bind to an anycast address might accidentally 180 * cause sending a packet with anycast source address. 181 * We should allow to bind to a deprecated address, since 182 * the application dares to use it. 183 */ 184 if (ia && 185 ((struct in6_ifaddr *)ia)->ia6_flags & 186 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 187 return (EADDRNOTAVAIL); 188 } 189 } 190 if (lport) { 191 struct inpcb *t; 192 193 /* GROSS */ 194 if (ntohs(lport) < IPV6PORT_RESERVED && td && 195 suser_cred(td->td_ucred, PRISON_ROOT)) 196 return (EACCES); 197 if (so->so_cred->cr_uid != 0 && 198 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 199 t = in6_pcblookup_local(pcbinfo, 200 &sin6->sin6_addr, lport, 201 INPLOOKUP_WILDCARD); 202 if (t && (t->inp_vflag & INP_TIMEWAIT)) { 203 if ((!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 204 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 205 !(intotw(t)->tw_so_options & SO_REUSEPORT)) 206 && so->so_cred->cr_uid != 207 intotw(t)->tw_cred->cr_uid) 208 return (EADDRINUSE); 209 } else if (t && 210 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 211 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 212 (t->inp_socket->so_options & SO_REUSEPORT) 213 == 0) && (so->so_cred->cr_uid != 214 t->inp_socket->so_cred->cr_uid)) 215 return (EADDRINUSE); 216 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 217 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 218 struct sockaddr_in sin; 219 220 in6_sin6_2_sin(&sin, sin6); 221 t = in_pcblookup_local(pcbinfo, 222 sin.sin_addr, lport, 223 INPLOOKUP_WILDCARD); 224 if (t && (t->inp_vflag & INP_TIMEWAIT)) { 225 if (so->so_cred->cr_uid != 226 intotw(t)->tw_cred->cr_uid && 227 (ntohl(t->inp_laddr.s_addr) != 228 INADDR_ANY || 229 ((inp->inp_vflag & 230 INP_IPV6PROTO) == 231 (t->inp_vflag & 232 INP_IPV6PROTO)))) 233 return (EADDRINUSE); 234 } else if (t && 235 (so->so_cred->cr_uid != 236 t->inp_socket->so_cred->cr_uid) && 237 (ntohl(t->inp_laddr.s_addr) != 238 INADDR_ANY || 239 INP_SOCKAF(so) == 240 INP_SOCKAF(t->inp_socket))) 241 return (EADDRINUSE); 242 } 243 } 244 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 245 lport, wild); 246 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 247 intotw(t)->tw_so_options : 248 t->inp_socket->so_options)) == 0) 249 return (EADDRINUSE); 250 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 251 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 252 struct sockaddr_in sin; 253 254 in6_sin6_2_sin(&sin, sin6); 255 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 256 lport, wild); 257 if (t && t->inp_vflag & INP_TIMEWAIT) { 258 if ((reuseport & 259 intotw(t)->tw_so_options) == 0 && 260 (ntohl(t->inp_laddr.s_addr) != 261 INADDR_ANY || ((inp->inp_vflag & 262 INP_IPV6PROTO) == 263 (t->inp_vflag & INP_IPV6PROTO)))) 264 return (EADDRINUSE); 265 } 266 else if (t && 267 (reuseport & t->inp_socket->so_options) 268 == 0 && (ntohl(t->inp_laddr.s_addr) != 269 INADDR_ANY || INP_SOCKAF(so) == 270 INP_SOCKAF(t->inp_socket))) 271 return (EADDRINUSE); 272 } 273 } 274 inp->in6p_laddr = sin6->sin6_addr; 275 } 276 if (lport == 0) { 277 int e; 278 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0) 279 return (e); 280 } 281 else { 282 inp->inp_lport = lport; 283 if (in_pcbinshash(inp) != 0) { 284 inp->in6p_laddr = in6addr_any; 285 inp->inp_lport = 0; 286 return (EAGAIN); 287 } 288 } 289 return (0); 290 } 291 292 /* 293 * Transform old in6_pcbconnect() into an inner subroutine for new 294 * in6_pcbconnect(): Do some validity-checking on the remote 295 * address (in mbuf 'nam') and then determine local host address 296 * (i.e., which interface) to use to access that remote host. 297 * 298 * This preserves definition of in6_pcbconnect(), while supporting a 299 * slightly different version for T/TCP. (This is more than 300 * a bit of a kludge, but cleaning up the internal interfaces would 301 * have forced minor changes in every protocol). 302 */ 303 304 int 305 in6_pcbladdr(inp, nam, plocal_addr6) 306 register struct inpcb *inp; 307 struct sockaddr *nam; 308 struct in6_addr **plocal_addr6; 309 { 310 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 311 struct ifnet *ifp = NULL; 312 int error = 0; 313 314 if (nam->sa_len != sizeof (*sin6)) 315 return (EINVAL); 316 if (sin6->sin6_family != AF_INET6) 317 return (EAFNOSUPPORT); 318 if (sin6->sin6_port == 0) 319 return (EADDRNOTAVAIL); 320 321 /* KAME hack: embed scopeid */ 322 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 323 return EINVAL; 324 325 if (in6_ifaddr) { 326 /* 327 * If the destination address is UNSPECIFIED addr, 328 * use the loopback addr, e.g ::1. 329 */ 330 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 331 sin6->sin6_addr = in6addr_loopback; 332 } 333 { 334 /* 335 * XXX: in6_selectsrc might replace the bound local address 336 * with the address specified by setsockopt(IPV6_PKTINFO). 337 * Is it the intended behavior? 338 */ 339 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 340 inp->in6p_moptions, 341 &inp->in6p_route, 342 &inp->in6p_laddr, &error); 343 if (*plocal_addr6 == 0) { 344 if (error == 0) 345 error = EADDRNOTAVAIL; 346 return (error); 347 } 348 /* 349 * Don't do pcblookup call here; return interface in 350 * plocal_addr6 351 * and exit to caller, that will do the lookup. 352 */ 353 } 354 355 if (inp->in6p_route.ro_rt) 356 ifp = inp->in6p_route.ro_rt->rt_ifp; 357 358 return (0); 359 } 360 361 /* 362 * Outer subroutine: 363 * Connect from a socket to a specified address. 364 * Both address and port must be specified in argument sin. 365 * If don't have a local address for this socket yet, 366 * then pick one. 367 */ 368 int 369 in6_pcbconnect(inp, nam, td) 370 register struct inpcb *inp; 371 struct sockaddr *nam; 372 struct thread *td; 373 { 374 struct in6_addr *addr6; 375 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 376 int error; 377 378 /* 379 * Call inner routine, to assign local interface address. 380 * in6_pcbladdr() may automatically fill in sin6_scope_id. 381 */ 382 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 383 return (error); 384 385 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 386 sin6->sin6_port, 387 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 388 ? addr6 : &inp->in6p_laddr, 389 inp->inp_lport, 0, NULL) != NULL) { 390 return (EADDRINUSE); 391 } 392 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 393 if (inp->inp_lport == 0) { 394 error = in6_pcbbind(inp, (struct sockaddr *)0, td); 395 if (error) 396 return (error); 397 } 398 inp->in6p_laddr = *addr6; 399 } 400 inp->in6p_faddr = sin6->sin6_addr; 401 inp->inp_fport = sin6->sin6_port; 402 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 403 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 404 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 405 inp->in6p_flowinfo |= 406 #ifdef RANDOM_IP_ID 407 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 408 #else 409 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 410 #endif 411 412 in_pcbrehash(inp); 413 return (0); 414 } 415 416 void 417 in6_pcbdisconnect(inp) 418 struct inpcb *inp; 419 { 420 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 421 inp->inp_fport = 0; 422 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 423 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 424 in_pcbrehash(inp); 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 #ifdef IPSEC 437 if (inp->in6p_sp != NULL) 438 ipsec6_delete_pcbpolicy(inp); 439 #endif /* IPSEC */ 440 inp->inp_gencnt = ++ipi->ipi_gencnt; 441 in_pcbremlists(inp); 442 443 if (so) { 444 so->so_pcb = NULL; 445 sotryfree(so); 446 } 447 448 ip6_freepcbopts(inp->in6p_outputopts); 449 ip6_freemoptions(inp->in6p_moptions); 450 if (inp->in6p_route.ro_rt) 451 RTFREE(inp->in6p_route.ro_rt); 452 /* Check and free IPv4 related resources in case of mapped addr */ 453 if (inp->inp_options) 454 (void)m_free(inp->inp_options); 455 ip_freemoptions(inp->inp_moptions); 456 inp->inp_vflag = 0; 457 INP_LOCK_DESTROY(inp); 458 uma_zfree(ipi->ipi_zone, inp); 459 } 460 461 struct sockaddr * 462 in6_sockaddr(port, addr_p) 463 in_port_t port; 464 struct in6_addr *addr_p; 465 { 466 struct sockaddr_in6 *sin6; 467 468 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 469 bzero(sin6, sizeof *sin6); 470 sin6->sin6_family = AF_INET6; 471 sin6->sin6_len = sizeof(*sin6); 472 sin6->sin6_port = port; 473 sin6->sin6_addr = *addr_p; 474 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 475 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 476 else 477 sin6->sin6_scope_id = 0; /*XXX*/ 478 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 479 sin6->sin6_addr.s6_addr16[1] = 0; 480 481 return (struct sockaddr *)sin6; 482 } 483 484 struct sockaddr * 485 in6_v4mapsin6_sockaddr(port, addr_p) 486 in_port_t port; 487 struct in_addr *addr_p; 488 { 489 struct sockaddr_in sin; 490 struct sockaddr_in6 *sin6_p; 491 492 bzero(&sin, sizeof sin); 493 sin.sin_family = AF_INET; 494 sin.sin_len = sizeof(sin); 495 sin.sin_port = port; 496 sin.sin_addr = *addr_p; 497 498 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 499 M_WAITOK); 500 in6_sin_2_v4mapsin6(&sin, sin6_p); 501 502 return (struct sockaddr *)sin6_p; 503 } 504 505 /* 506 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 507 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 508 * in struct pr_usrreqs, so that protocols can just reference then directly 509 * without the need for a wrapper function. The socket must have a valid 510 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 511 * except through a kernel programming error, so it is acceptable to panic 512 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 513 * because there actually /is/ a programming error somewhere... XXX) 514 */ 515 int 516 in6_setsockaddr(so, nam) 517 struct socket *so; 518 struct sockaddr **nam; 519 { 520 int s; 521 register struct inpcb *inp; 522 struct in6_addr addr; 523 in_port_t port; 524 525 s = splnet(); 526 inp = sotoinpcb(so); 527 if (!inp) { 528 splx(s); 529 return EINVAL; 530 } 531 port = inp->inp_lport; 532 addr = inp->in6p_laddr; 533 splx(s); 534 535 *nam = in6_sockaddr(port, &addr); 536 return 0; 537 } 538 539 int 540 in6_setpeeraddr(so, nam) 541 struct socket *so; 542 struct sockaddr **nam; 543 { 544 int s; 545 struct inpcb *inp; 546 struct in6_addr addr; 547 in_port_t port; 548 549 s = splnet(); 550 inp = sotoinpcb(so); 551 if (!inp) { 552 splx(s); 553 return EINVAL; 554 } 555 port = inp->inp_fport; 556 addr = inp->in6p_faddr; 557 splx(s); 558 559 *nam = in6_sockaddr(port, &addr); 560 return 0; 561 } 562 563 int 564 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 565 { 566 struct inpcb *inp = sotoinpcb(so); 567 int error; 568 569 if (inp == NULL) 570 return EINVAL; 571 if (inp->inp_vflag & INP_IPV4) { 572 error = in_setsockaddr(so, nam, &tcbinfo); 573 if (error == 0) 574 in6_sin_2_v4mapsin6_in_sock(nam); 575 } else { 576 /* scope issues will be handled in in6_setsockaddr(). */ 577 error = in6_setsockaddr(so, nam); 578 } 579 580 return error; 581 } 582 583 int 584 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 585 { 586 struct inpcb *inp = sotoinpcb(so); 587 int error; 588 589 if (inp == NULL) 590 return EINVAL; 591 if (inp->inp_vflag & INP_IPV4) { 592 error = in_setpeeraddr(so, nam, &tcbinfo); 593 if (error == 0) 594 in6_sin_2_v4mapsin6_in_sock(nam); 595 } else 596 /* scope issues will be handled in in6_setpeeraddr(). */ 597 error = in6_setpeeraddr(so, nam); 598 599 return error; 600 } 601 602 /* 603 * Pass some notification to all connections of a protocol 604 * associated with address dst. The local address and/or port numbers 605 * may be specified to limit the search. The "usual action" will be 606 * taken, depending on the ctlinput cmd. The caller must filter any 607 * cmds that are uninteresting (e.g., no error in the map). 608 * Call the protocol specific routine (if any) to report 609 * any errors for each matching socket. 610 * 611 * Must be called at splnet. 612 */ 613 void 614 in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, notify) 615 struct inpcbhead *head; 616 struct sockaddr *dst; 617 const struct sockaddr *src; 618 u_int fport_arg, lport_arg; 619 int cmd; 620 struct inpcb *(*notify) __P((struct inpcb *, int)); 621 { 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 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 660 ninp = LIST_NEXT(inp, inp_list); 661 662 if ((inp->inp_vflag & INP_IPV6) == 0) 663 continue; 664 665 /* 666 * Detect if we should notify the error. If no source and 667 * destination ports are specifed, but non-zero flowinfo and 668 * local address match, notify the error. This is the case 669 * when the error is delivered with an encrypted buffer 670 * by ESP. Otherwise, just compare addresses and ports 671 * as usual. 672 */ 673 if (lport == 0 && fport == 0 && flowinfo && 674 inp->inp_socket != NULL && 675 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 676 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 677 goto do_notify; 678 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 679 &sa6_dst->sin6_addr) || 680 inp->inp_socket == 0 || 681 (lport && inp->inp_lport != lport) || 682 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 683 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 684 &sa6_src.sin6_addr)) || 685 (fport && inp->inp_fport != fport)) 686 continue; 687 688 do_notify: 689 if (notify) 690 (*notify)(inp, errno); 691 } 692 splx(s); 693 } 694 695 /* 696 * Lookup a PCB based on the local address and port. 697 */ 698 struct inpcb * 699 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 700 struct inpcbinfo *pcbinfo; 701 struct in6_addr *laddr; 702 u_int lport_arg; 703 int wild_okay; 704 { 705 register struct inpcb *inp; 706 int matchwild = 3, wildcard; 707 u_short lport = lport_arg; 708 709 if (!wild_okay) { 710 struct inpcbhead *head; 711 /* 712 * Look for an unconnected (wildcard foreign addr) PCB that 713 * matches the local address and port we're looking for. 714 */ 715 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 716 pcbinfo->hashmask)]; 717 LIST_FOREACH(inp, head, inp_hash) { 718 if ((inp->inp_vflag & INP_IPV6) == 0) 719 continue; 720 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 721 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 722 inp->inp_lport == lport) { 723 /* 724 * Found. 725 */ 726 return (inp); 727 } 728 } 729 /* 730 * Not found. 731 */ 732 return (NULL); 733 } else { 734 struct inpcbporthead *porthash; 735 struct inpcbport *phd; 736 struct inpcb *match = NULL; 737 /* 738 * Best fit PCB lookup. 739 * 740 * First see if this local port is in use by looking on the 741 * port hash list. 742 */ 743 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 744 pcbinfo->porthashmask)]; 745 LIST_FOREACH(phd, porthash, phd_hash) { 746 if (phd->phd_port == lport) 747 break; 748 } 749 if (phd != NULL) { 750 /* 751 * Port is in use by one or more PCBs. Look for best 752 * fit. 753 */ 754 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 755 wildcard = 0; 756 if ((inp->inp_vflag & INP_IPV6) == 0) 757 continue; 758 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 759 wildcard++; 760 if (!IN6_IS_ADDR_UNSPECIFIED( 761 &inp->in6p_laddr)) { 762 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 763 wildcard++; 764 else if (!IN6_ARE_ADDR_EQUAL( 765 &inp->in6p_laddr, laddr)) 766 continue; 767 } else { 768 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 769 wildcard++; 770 } 771 if (wildcard < matchwild) { 772 match = inp; 773 matchwild = wildcard; 774 if (matchwild == 0) { 775 break; 776 } 777 } 778 } 779 } 780 return (match); 781 } 782 } 783 784 void 785 in6_pcbpurgeif0(head, ifp) 786 struct in6pcb *head; 787 struct ifnet *ifp; 788 { 789 struct in6pcb *in6p; 790 struct ip6_moptions *im6o; 791 struct in6_multi_mship *imm, *nimm; 792 793 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 794 im6o = in6p->in6p_moptions; 795 if ((in6p->inp_vflag & INP_IPV6) && 796 im6o) { 797 /* 798 * Unselect the outgoing interface if it is being 799 * detached. 800 */ 801 if (im6o->im6o_multicast_ifp == ifp) 802 im6o->im6o_multicast_ifp = NULL; 803 804 /* 805 * Drop multicast group membership if we joined 806 * through the interface being detached. 807 * XXX controversial - is it really legal for kernel 808 * to force this? 809 */ 810 for (imm = im6o->im6o_memberships.lh_first; 811 imm != NULL; imm = nimm) { 812 nimm = imm->i6mm_chain.le_next; 813 if (imm->i6mm_maddr->in6m_ifp == ifp) { 814 LIST_REMOVE(imm, i6mm_chain); 815 in6_delmulti(imm->i6mm_maddr); 816 free(imm, M_IPMADDR); 817 } 818 } 819 } 820 } 821 } 822 823 /* 824 * Check for alternatives when higher level complains 825 * about service problems. For now, invalidate cached 826 * routing information. If the route was created dynamically 827 * (by a redirect), time to try a default gateway again. 828 */ 829 void 830 in6_losing(in6p) 831 struct inpcb *in6p; 832 { 833 struct rtentry *rt; 834 struct rt_addrinfo info; 835 836 if ((rt = in6p->in6p_route.ro_rt) != NULL) { 837 RT_LOCK(rt); 838 in6p->in6p_route.ro_rt = NULL; 839 bzero((caddr_t)&info, sizeof(info)); 840 info.rti_flags = rt->rt_flags; 841 info.rti_info[RTAX_DST] = rt_key(rt); 842 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 843 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 844 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); 845 if (rt->rt_flags & RTF_DYNAMIC) 846 rtexpunge(rt); 847 RTFREE_LOCKED(rt); 848 /* 849 * A new route can be allocated 850 * the next time output is attempted. 851 */ 852 } 853 } 854 855 /* 856 * After a routing change, flush old routing 857 * and allocate a (hopefully) better one. 858 */ 859 struct inpcb * 860 in6_rtchange(inp, errno) 861 struct inpcb *inp; 862 int errno; 863 { 864 if (inp->in6p_route.ro_rt) { 865 RTFREE(inp->in6p_route.ro_rt); 866 inp->in6p_route.ro_rt = 0; 867 /* 868 * A new route can be allocated the next time 869 * output is attempted. 870 */ 871 } 872 return inp; 873 } 874 875 /* 876 * Lookup PCB in hash list. 877 */ 878 struct inpcb * 879 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 880 struct inpcbinfo *pcbinfo; 881 struct in6_addr *faddr, *laddr; 882 u_int fport_arg, lport_arg; 883 int wildcard; 884 struct ifnet *ifp; 885 { 886 struct inpcbhead *head; 887 register struct inpcb *inp; 888 u_short fport = fport_arg, lport = lport_arg; 889 int faith; 890 891 if (faithprefix_p != NULL) 892 faith = (*faithprefix_p)(laddr); 893 else 894 faith = 0; 895 896 /* 897 * First look for an exact match. 898 */ 899 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 900 lport, fport, 901 pcbinfo->hashmask)]; 902 LIST_FOREACH(inp, head, inp_hash) { 903 if ((inp->inp_vflag & INP_IPV6) == 0) 904 continue; 905 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 906 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 907 inp->inp_fport == fport && 908 inp->inp_lport == lport) { 909 /* 910 * Found. 911 */ 912 return (inp); 913 } 914 } 915 if (wildcard) { 916 struct inpcb *local_wild = NULL; 917 918 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 919 pcbinfo->hashmask)]; 920 LIST_FOREACH(inp, head, inp_hash) { 921 if ((inp->inp_vflag & INP_IPV6) == 0) 922 continue; 923 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 924 inp->inp_lport == lport) { 925 if (faith && (inp->inp_flags & INP_FAITH) == 0) 926 continue; 927 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 928 laddr)) 929 return (inp); 930 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 931 local_wild = inp; 932 } 933 } 934 return (local_wild); 935 } 936 937 /* 938 * Not found. 939 */ 940 return (NULL); 941 } 942 943 void 944 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 945 { 946 struct ip6_hdr *ip; 947 948 ip = mtod(m, struct ip6_hdr *); 949 bzero(sin6, sizeof(*sin6)); 950 sin6->sin6_len = sizeof(*sin6); 951 sin6->sin6_family = AF_INET6; 952 sin6->sin6_addr = ip->ip6_src; 953 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 954 sin6->sin6_addr.s6_addr16[1] = 0; 955 sin6->sin6_scope_id = 956 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 957 ? m->m_pkthdr.rcvif->if_index : 0; 958 959 return; 960 } 961