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sys/netinet6/in6_pcb.c
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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) <= ipport_reservedhigh && 192 ntohs(lport) >= ipport_reservedlow && 193 suser_cred(cred, SUSER_ALLOWJAIL)) 194 return (EACCES); 195 if (so->so_cred->cr_uid != 0 && 196 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 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 struct ifnet *ifp = NULL; 297 int error = 0; 298 299 if (nam->sa_len != sizeof (*sin6)) 300 return (EINVAL); 301 if (sin6->sin6_family != AF_INET6) 302 return (EAFNOSUPPORT); 303 if (sin6->sin6_port == 0) 304 return (EADDRNOTAVAIL); 305 306 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 307 INP_LOCK_ASSERT(inp); 308 309 /* KAME hack: embed scopeid */ 310 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 311 return EINVAL; 312 313 if (in6_ifaddr) { 314 /* 315 * If the destination address is UNSPECIFIED addr, 316 * use the loopback addr, e.g ::1. 317 */ 318 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 319 sin6->sin6_addr = in6addr_loopback; 320 } 321 { 322 /* 323 * XXX: in6_selectsrc might replace the bound local address 324 * with the address specified by setsockopt(IPV6_PKTINFO). 325 * Is it the intended behavior? 326 */ 327 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 328 inp->in6p_moptions, NULL, 329 &inp->in6p_laddr, &error); 330 if (*plocal_addr6 == 0) { 331 if (error == 0) 332 error = EADDRNOTAVAIL; 333 return (error); 334 } 335 /* 336 * Don't do pcblookup call here; return interface in 337 * plocal_addr6 338 * and exit to caller, that will do the lookup. 339 */ 340 } 341 return (0); 342 } 343 344 /* 345 * Outer subroutine: 346 * Connect from a socket to a specified address. 347 * Both address and port must be specified in argument sin. 348 * If don't have a local address for this socket yet, 349 * then pick one. 350 */ 351 int 352 in6_pcbconnect(inp, nam, cred) 353 register struct inpcb *inp; 354 struct sockaddr *nam; 355 struct ucred *cred; 356 { 357 struct in6_addr *addr6; 358 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 359 int error; 360 361 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 362 INP_LOCK_ASSERT(inp); 363 364 /* 365 * Call inner routine, to assign local interface address. 366 * in6_pcbladdr() may automatically fill in sin6_scope_id. 367 */ 368 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 369 return (error); 370 371 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 372 sin6->sin6_port, 373 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 374 ? addr6 : &inp->in6p_laddr, 375 inp->inp_lport, 0, NULL) != NULL) { 376 return (EADDRINUSE); 377 } 378 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 379 if (inp->inp_lport == 0) { 380 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 381 if (error) 382 return (error); 383 } 384 inp->in6p_laddr = *addr6; 385 } 386 inp->in6p_faddr = sin6->sin6_addr; 387 inp->inp_fport = sin6->sin6_port; 388 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 389 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 390 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 391 inp->in6p_flowinfo |= 392 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 393 394 in_pcbrehash(inp); 395 #ifdef IPSEC 396 if (inp->inp_socket->so_type == SOCK_STREAM) 397 ipsec_pcbconn(inp->inp_sp); 398 #endif 399 return (0); 400 } 401 402 void 403 in6_pcbdisconnect(inp) 404 struct inpcb *inp; 405 { 406 407 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 408 INP_LOCK_ASSERT(inp); 409 410 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 411 inp->inp_fport = 0; 412 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 413 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 414 in_pcbrehash(inp); 415 #ifdef IPSEC 416 ipsec_pcbdisconn(inp->inp_sp); 417 #endif 418 if (inp->inp_socket->so_state & SS_NOFDREF) 419 in6_pcbdetach(inp); 420 } 421 422 void 423 in6_pcbdetach(inp) 424 struct inpcb *inp; 425 { 426 struct socket *so = inp->inp_socket; 427 struct inpcbinfo *ipi = inp->inp_pcbinfo; 428 429 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo); 430 INP_LOCK_ASSERT(inp); 431 432 #if defined(IPSEC) || defined(FAST_IPSEC) 433 if (inp->in6p_sp != NULL) 434 ipsec6_delete_pcbpolicy(inp); 435 #endif /* IPSEC */ 436 inp->inp_gencnt = ++ipi->ipi_gencnt; 437 in_pcbremlists(inp); 438 439 if (so) { 440 ACCEPT_LOCK(); 441 SOCK_LOCK(so); 442 so->so_pcb = NULL; 443 sotryfree(so); 444 } 445 446 ip6_freepcbopts(inp->in6p_outputopts); 447 ip6_freemoptions(inp->in6p_moptions); 448 /* Check and free IPv4 related resources in case of mapped addr */ 449 if (inp->inp_options) 450 (void)m_free(inp->inp_options); 451 ip_freemoptions(inp->inp_moptions); 452 inp->inp_vflag = 0; 453 INP_LOCK_DESTROY(inp); 454 uma_zfree(ipi->ipi_zone, inp); 455 } 456 457 struct sockaddr * 458 in6_sockaddr(port, addr_p) 459 in_port_t port; 460 struct in6_addr *addr_p; 461 { 462 struct sockaddr_in6 *sin6; 463 464 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 465 bzero(sin6, sizeof *sin6); 466 sin6->sin6_family = AF_INET6; 467 sin6->sin6_len = sizeof(*sin6); 468 sin6->sin6_port = port; 469 sin6->sin6_addr = *addr_p; 470 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 471 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 472 else 473 sin6->sin6_scope_id = 0; /*XXX*/ 474 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 475 sin6->sin6_addr.s6_addr16[1] = 0; 476 477 return (struct sockaddr *)sin6; 478 } 479 480 struct sockaddr * 481 in6_v4mapsin6_sockaddr(port, addr_p) 482 in_port_t port; 483 struct in_addr *addr_p; 484 { 485 struct sockaddr_in sin; 486 struct sockaddr_in6 *sin6_p; 487 488 bzero(&sin, sizeof sin); 489 sin.sin_family = AF_INET; 490 sin.sin_len = sizeof(sin); 491 sin.sin_port = port; 492 sin.sin_addr = *addr_p; 493 494 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 495 M_WAITOK); 496 in6_sin_2_v4mapsin6(&sin, sin6_p); 497 498 return (struct sockaddr *)sin6_p; 499 } 500 501 /* 502 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 503 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 504 * in struct pr_usrreqs, so that protocols can just reference then directly 505 * without the need for a wrapper function. The socket must have a valid 506 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 507 * except through a kernel programming error, so it is acceptable to panic 508 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 509 * because there actually /is/ a programming error somewhere... XXX) 510 */ 511 int 512 in6_setsockaddr(so, nam) 513 struct socket *so; 514 struct sockaddr **nam; 515 { 516 int s; 517 register struct inpcb *inp; 518 struct in6_addr addr; 519 in_port_t port; 520 521 s = splnet(); 522 inp = sotoinpcb(so); 523 if (!inp) { 524 splx(s); 525 return EINVAL; 526 } 527 port = inp->inp_lport; 528 addr = inp->in6p_laddr; 529 splx(s); 530 531 *nam = in6_sockaddr(port, &addr); 532 return 0; 533 } 534 535 int 536 in6_setpeeraddr(so, nam) 537 struct socket *so; 538 struct sockaddr **nam; 539 { 540 int s; 541 struct inpcb *inp; 542 struct in6_addr addr; 543 in_port_t port; 544 545 s = splnet(); 546 inp = sotoinpcb(so); 547 if (!inp) { 548 splx(s); 549 return EINVAL; 550 } 551 port = inp->inp_fport; 552 addr = inp->in6p_faddr; 553 splx(s); 554 555 *nam = in6_sockaddr(port, &addr); 556 return 0; 557 } 558 559 int 560 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 561 { 562 struct inpcb *inp = sotoinpcb(so); 563 int error; 564 565 if (inp == NULL) 566 return EINVAL; 567 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 568 error = in_setsockaddr(so, nam, &tcbinfo); 569 if (error == 0) 570 in6_sin_2_v4mapsin6_in_sock(nam); 571 } else { 572 /* scope issues will be handled in in6_setsockaddr(). */ 573 error = in6_setsockaddr(so, nam); 574 } 575 576 return error; 577 } 578 579 int 580 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 581 { 582 struct inpcb *inp = sotoinpcb(so); 583 int error; 584 585 if (inp == NULL) 586 return EINVAL; 587 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 588 error = in_setpeeraddr(so, nam, &tcbinfo); 589 if (error == 0) 590 in6_sin_2_v4mapsin6_in_sock(nam); 591 } else 592 /* scope issues will be handled in in6_setpeeraddr(). */ 593 error = in6_setpeeraddr(so, nam); 594 595 return error; 596 } 597 598 /* 599 * Pass some notification to all connections of a protocol 600 * associated with address dst. The local address and/or port numbers 601 * may be specified to limit the search. The "usual action" will be 602 * taken, depending on the ctlinput cmd. The caller must filter any 603 * cmds that are uninteresting (e.g., no error in the map). 604 * Call the protocol specific routine (if any) to report 605 * any errors for each matching socket. 606 * 607 * Must be called at splnet. 608 */ 609 void 610 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 611 struct inpcbinfo *pcbinfo; 612 struct sockaddr *dst; 613 const struct sockaddr *src; 614 u_int fport_arg, lport_arg; 615 int cmd; 616 void *cmdarg; 617 struct inpcb *(*notify) __P((struct inpcb *, int)); 618 { 619 struct inpcbhead *head; 620 struct inpcb *inp, *ninp; 621 struct sockaddr_in6 sa6_src, *sa6_dst; 622 u_short fport = fport_arg, lport = lport_arg; 623 u_int32_t flowinfo; 624 int errno, s; 625 626 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 627 return; 628 629 sa6_dst = (struct sockaddr_in6 *)dst; 630 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 631 return; 632 633 /* 634 * note that src can be NULL when we get notify by local fragmentation. 635 */ 636 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 637 flowinfo = sa6_src.sin6_flowinfo; 638 639 /* 640 * Redirects go to all references to the destination, 641 * and use in6_rtchange to invalidate the route cache. 642 * Dead host indications: also use in6_rtchange to invalidate 643 * the cache, and deliver the error to all the sockets. 644 * Otherwise, if we have knowledge of the local port and address, 645 * deliver only to that socket. 646 */ 647 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 648 fport = 0; 649 lport = 0; 650 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 651 652 if (cmd != PRC_HOSTDEAD) 653 notify = in6_rtchange; 654 } 655 errno = inet6ctlerrmap[cmd]; 656 s = splnet(); 657 head = pcbinfo->listhead; 658 INP_INFO_WLOCK(pcbinfo); 659 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 660 INP_LOCK(inp); 661 ninp = LIST_NEXT(inp, inp_list); 662 663 if ((inp->inp_vflag & INP_IPV6) == 0) { 664 INP_UNLOCK(inp); 665 continue; 666 } 667 668 /* 669 * If the error designates a new path MTU for a destination 670 * and the application (associated with this socket) wanted to 671 * know the value, notify. Note that we notify for all 672 * disconnected sockets if the corresponding application 673 * wanted. This is because some UDP applications keep sending 674 * sockets disconnected. 675 * XXX: should we avoid to notify the value to TCP sockets? 676 */ 677 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 678 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 679 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 680 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 681 (u_int32_t *)cmdarg); 682 } 683 684 /* 685 * Detect if we should notify the error. If no source and 686 * destination ports are specifed, but non-zero flowinfo and 687 * local address match, notify the error. This is the case 688 * when the error is delivered with an encrypted buffer 689 * by ESP. Otherwise, just compare addresses and ports 690 * as usual. 691 */ 692 if (lport == 0 && fport == 0 && flowinfo && 693 inp->inp_socket != NULL && 694 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 695 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 696 goto do_notify; 697 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 698 &sa6_dst->sin6_addr) || 699 inp->inp_socket == 0 || 700 (lport && inp->inp_lport != lport) || 701 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 702 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 703 &sa6_src.sin6_addr)) || 704 (fport && inp->inp_fport != fport)) { 705 INP_UNLOCK(inp); 706 continue; 707 } 708 709 do_notify: 710 if (notify) { 711 if ((*notify)(inp, errno)) 712 INP_UNLOCK(inp); 713 } else 714 INP_UNLOCK(inp); 715 } 716 INP_INFO_WUNLOCK(pcbinfo); 717 splx(s); 718 } 719 720 /* 721 * Lookup a PCB based on the local address and port. 722 */ 723 struct inpcb * 724 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 725 struct inpcbinfo *pcbinfo; 726 struct in6_addr *laddr; 727 u_int lport_arg; 728 int wild_okay; 729 { 730 register struct inpcb *inp; 731 int matchwild = 3, wildcard; 732 u_short lport = lport_arg; 733 734 if (!wild_okay) { 735 struct inpcbhead *head; 736 /* 737 * Look for an unconnected (wildcard foreign addr) PCB that 738 * matches the local address and port we're looking for. 739 */ 740 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 741 pcbinfo->hashmask)]; 742 LIST_FOREACH(inp, head, inp_hash) { 743 if ((inp->inp_vflag & INP_IPV6) == 0) 744 continue; 745 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 746 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 747 inp->inp_lport == lport) { 748 /* 749 * Found. 750 */ 751 return (inp); 752 } 753 } 754 /* 755 * Not found. 756 */ 757 return (NULL); 758 } else { 759 struct inpcbporthead *porthash; 760 struct inpcbport *phd; 761 struct inpcb *match = NULL; 762 /* 763 * Best fit PCB lookup. 764 * 765 * First see if this local port is in use by looking on the 766 * port hash list. 767 */ 768 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 769 pcbinfo->porthashmask)]; 770 LIST_FOREACH(phd, porthash, phd_hash) { 771 if (phd->phd_port == lport) 772 break; 773 } 774 if (phd != NULL) { 775 /* 776 * Port is in use by one or more PCBs. Look for best 777 * fit. 778 */ 779 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 780 wildcard = 0; 781 if ((inp->inp_vflag & INP_IPV6) == 0) 782 continue; 783 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 784 wildcard++; 785 if (!IN6_IS_ADDR_UNSPECIFIED( 786 &inp->in6p_laddr)) { 787 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 788 wildcard++; 789 else if (!IN6_ARE_ADDR_EQUAL( 790 &inp->in6p_laddr, laddr)) 791 continue; 792 } else { 793 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 794 wildcard++; 795 } 796 if (wildcard < matchwild) { 797 match = inp; 798 matchwild = wildcard; 799 if (matchwild == 0) { 800 break; 801 } 802 } 803 } 804 } 805 return (match); 806 } 807 } 808 809 void 810 in6_pcbpurgeif0(head, ifp) 811 struct in6pcb *head; 812 struct ifnet *ifp; 813 { 814 struct in6pcb *in6p; 815 struct ip6_moptions *im6o; 816 struct in6_multi_mship *imm, *nimm; 817 818 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 819 im6o = in6p->in6p_moptions; 820 if ((in6p->inp_vflag & INP_IPV6) && 821 im6o) { 822 /* 823 * Unselect the outgoing interface if it is being 824 * detached. 825 */ 826 if (im6o->im6o_multicast_ifp == ifp) 827 im6o->im6o_multicast_ifp = NULL; 828 829 /* 830 * Drop multicast group membership if we joined 831 * through the interface being detached. 832 * XXX controversial - is it really legal for kernel 833 * to force this? 834 */ 835 for (imm = im6o->im6o_memberships.lh_first; 836 imm != NULL; imm = nimm) { 837 nimm = imm->i6mm_chain.le_next; 838 if (imm->i6mm_maddr->in6m_ifp == ifp) { 839 LIST_REMOVE(imm, i6mm_chain); 840 in6_delmulti(imm->i6mm_maddr); 841 free(imm, M_IPMADDR); 842 } 843 } 844 } 845 } 846 } 847 848 /* 849 * Check for alternatives when higher level complains 850 * about service problems. For now, invalidate cached 851 * routing information. If the route was created dynamically 852 * (by a redirect), time to try a default gateway again. 853 */ 854 void 855 in6_losing(in6p) 856 struct inpcb *in6p; 857 { 858 /* 859 * We don't store route pointers in the routing table anymore 860 */ 861 return; 862 } 863 864 /* 865 * After a routing change, flush old routing 866 * and allocate a (hopefully) better one. 867 */ 868 struct inpcb * 869 in6_rtchange(inp, errno) 870 struct inpcb *inp; 871 int errno; 872 { 873 /* 874 * We don't store route pointers in the routing table anymore 875 */ 876 return inp; 877 } 878 879 /* 880 * Lookup PCB in hash list. 881 */ 882 struct inpcb * 883 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 884 struct inpcbinfo *pcbinfo; 885 struct in6_addr *faddr, *laddr; 886 u_int fport_arg, lport_arg; 887 int wildcard; 888 struct ifnet *ifp; 889 { 890 struct inpcbhead *head; 891 register struct inpcb *inp; 892 u_short fport = fport_arg, lport = lport_arg; 893 int faith; 894 895 if (faithprefix_p != NULL) 896 faith = (*faithprefix_p)(laddr); 897 else 898 faith = 0; 899 900 /* 901 * First look for an exact match. 902 */ 903 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 904 lport, fport, 905 pcbinfo->hashmask)]; 906 LIST_FOREACH(inp, head, inp_hash) { 907 if ((inp->inp_vflag & INP_IPV6) == 0) 908 continue; 909 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 910 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 911 inp->inp_fport == fport && 912 inp->inp_lport == lport) { 913 /* 914 * Found. 915 */ 916 return (inp); 917 } 918 } 919 if (wildcard) { 920 struct inpcb *local_wild = NULL; 921 922 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 923 pcbinfo->hashmask)]; 924 LIST_FOREACH(inp, head, inp_hash) { 925 if ((inp->inp_vflag & INP_IPV6) == 0) 926 continue; 927 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 928 inp->inp_lport == lport) { 929 if (faith && (inp->inp_flags & INP_FAITH) == 0) 930 continue; 931 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 932 laddr)) 933 return (inp); 934 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 935 local_wild = inp; 936 } 937 } 938 return (local_wild); 939 } 940 941 /* 942 * Not found. 943 */ 944 return (NULL); 945 } 946 947 void 948 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 949 { 950 struct ip6_hdr *ip; 951 952 ip = mtod(m, struct ip6_hdr *); 953 bzero(sin6, sizeof(*sin6)); 954 sin6->sin6_len = sizeof(*sin6); 955 sin6->sin6_family = AF_INET6; 956 sin6->sin6_addr = ip->ip6_src; 957 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 958 sin6->sin6_addr.s6_addr16[1] = 0; 959 sin6->sin6_scope_id = 960 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 961 ? m->m_pkthdr.rcvif->if_index : 0; 962 963 return; 964 }
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