in6_pcb.c revision 132699
1/* $FreeBSD: head/sys/netinet6/in6_pcb.c 132699 2004-07-27 16:35:09Z yar $ */ 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#include "opt_random_ip_id.h" 69 70#include <sys/param.h> 71#include <sys/systm.h> 72#include <sys/malloc.h> 73#include <sys/mbuf.h> 74#include <sys/domain.h> 75#include <sys/protosw.h> 76#include <sys/socket.h> 77#include <sys/socketvar.h> 78#include <sys/sockio.h> 79#include <sys/errno.h> 80#include <sys/time.h> 81#include <sys/proc.h> 82#include <sys/jail.h> 83 84#include <vm/uma.h> 85 86#include <net/if.h> 87#include <net/if_types.h> 88#include <net/route.h> 89 90#include <netinet/in.h> 91#include <netinet/in_var.h> 92#include <netinet/in_systm.h> 93#include <netinet/tcp_var.h> 94#include <netinet/ip6.h> 95#include <netinet/ip_var.h> 96#include <netinet6/ip6_var.h> 97#include <netinet6/nd6.h> 98#include <netinet/in_pcb.h> 99#include <netinet6/in6_pcb.h> 100 101#ifdef IPSEC 102#include <netinet6/ipsec.h> 103#ifdef INET6 104#include <netinet6/ipsec6.h> 105#endif 106#include <netinet6/ah.h> 107#ifdef INET6 108#include <netinet6/ah6.h> 109#endif 110#include <netkey/key.h> 111#endif /* IPSEC */ 112 113#ifdef FAST_IPSEC 114#include <netipsec/ipsec.h> 115#include <netipsec/ipsec6.h> 116#include <netipsec/key.h> 117#endif /* FAST_IPSEC */ 118 119struct in6_addr zeroin6_addr; 120 121int 122in6_pcbbind(inp, nam, cred) 123 register struct inpcb *inp; 124 struct sockaddr *nam; 125 struct ucred *cred; 126{ 127 struct socket *so = inp->inp_socket; 128 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL; 129 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; 130 u_short lport = 0; 131 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); 132 133 if (!in6_ifaddr) /* XXX broken! */ 134 return (EADDRNOTAVAIL); 135 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 136 return (EINVAL); 137 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) 138 wild = 1; 139 if (nam) { 140 sin6 = (struct sockaddr_in6 *)nam; 141 if (nam->sa_len != sizeof(*sin6)) 142 return (EINVAL); 143 /* 144 * family check. 145 */ 146 if (nam->sa_family != AF_INET6) 147 return (EAFNOSUPPORT); 148 149 /* KAME hack: embed scopeid */ 150 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0) 151 return EINVAL; 152 /* this must be cleared for ifa_ifwithaddr() */ 153 sin6->sin6_scope_id = 0; 154 155 lport = sin6->sin6_port; 156 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 157 /* 158 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; 159 * allow compepte duplication of binding if 160 * SO_REUSEPORT is set, or if SO_REUSEADDR is set 161 * and a multicast address is bound on both 162 * new and duplicated sockets. 163 */ 164 if (so->so_options & SO_REUSEADDR) 165 reuseport = SO_REUSEADDR|SO_REUSEPORT; 166 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 167 struct ifaddr *ia = NULL; 168 169 sin6->sin6_port = 0; /* yech... */ 170 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0) 171 return (EADDRNOTAVAIL); 172 173 /* 174 * XXX: bind to an anycast address might accidentally 175 * cause sending a packet with anycast source address. 176 * We should allow to bind to a deprecated address, since 177 * the application dares to use it. 178 */ 179 if (ia && 180 ((struct in6_ifaddr *)ia)->ia6_flags & 181 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) { 182 return (EADDRNOTAVAIL); 183 } 184 } 185 if (lport) { 186 struct inpcb *t; 187 188 /* GROSS */ 189 if (ntohs(lport) < IPV6PORT_RESERVED && 190 suser_cred(cred, SUSER_ALLOWJAIL)) 191 return (EACCES); 192 if (so->so_cred->cr_uid != 0 && 193 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { 194 t = in6_pcblookup_local(pcbinfo, 195 &sin6->sin6_addr, lport, 196 INPLOOKUP_WILDCARD); 197 if (t && 198 ((t->inp_vflag & INP_TIMEWAIT) == 0) && 199 (so->so_type != SOCK_STREAM || 200 IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) && 201 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || 202 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || 203 (t->inp_socket->so_options & SO_REUSEPORT) 204 == 0) && (so->so_cred->cr_uid != 205 t->inp_socket->so_cred->cr_uid)) 206 return (EADDRINUSE); 207 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 208 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 209 struct sockaddr_in sin; 210 211 in6_sin6_2_sin(&sin, sin6); 212 t = in_pcblookup_local(pcbinfo, 213 sin.sin_addr, lport, 214 INPLOOKUP_WILDCARD); 215 if (t && 216 ((t->inp_vflag & 217 INP_TIMEWAIT) == 0) && 218 (so->so_type != SOCK_STREAM || 219 ntohl(t->inp_faddr.s_addr) == 220 INADDR_ANY) && 221 (so->so_cred->cr_uid != 222 t->inp_socket->so_cred->cr_uid) && 223 (ntohl(t->inp_laddr.s_addr) != 224 INADDR_ANY || 225 INP_SOCKAF(so) == 226 INP_SOCKAF(t->inp_socket))) 227 return (EADDRINUSE); 228 } 229 } 230 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr, 231 lport, wild); 232 if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ? 233 intotw(t)->tw_so_options : 234 t->inp_socket->so_options)) == 0) 235 return (EADDRINUSE); 236 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 && 237 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { 238 struct sockaddr_in sin; 239 240 in6_sin6_2_sin(&sin, sin6); 241 t = in_pcblookup_local(pcbinfo, sin.sin_addr, 242 lport, wild); 243 if (t && t->inp_vflag & INP_TIMEWAIT) { 244 if ((reuseport & 245 intotw(t)->tw_so_options) == 0 && 246 (ntohl(t->inp_laddr.s_addr) != 247 INADDR_ANY || ((inp->inp_vflag & 248 INP_IPV6PROTO) == 249 (t->inp_vflag & INP_IPV6PROTO)))) 250 return (EADDRINUSE); 251 } 252 else if (t && 253 (reuseport & t->inp_socket->so_options) 254 == 0 && (ntohl(t->inp_laddr.s_addr) != 255 INADDR_ANY || INP_SOCKAF(so) == 256 INP_SOCKAF(t->inp_socket))) 257 return (EADDRINUSE); 258 } 259 } 260 inp->in6p_laddr = sin6->sin6_addr; 261 } 262 if (lport == 0) { 263 int e; 264 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) 265 return (e); 266 } 267 else { 268 inp->inp_lport = lport; 269 if (in_pcbinshash(inp) != 0) { 270 inp->in6p_laddr = in6addr_any; 271 inp->inp_lport = 0; 272 return (EAGAIN); 273 } 274 } 275 return (0); 276} 277 278/* 279 * Transform old in6_pcbconnect() into an inner subroutine for new 280 * in6_pcbconnect(): Do some validity-checking on the remote 281 * address (in mbuf 'nam') and then determine local host address 282 * (i.e., which interface) to use to access that remote host. 283 * 284 * This preserves definition of in6_pcbconnect(), while supporting a 285 * slightly different version for T/TCP. (This is more than 286 * a bit of a kludge, but cleaning up the internal interfaces would 287 * have forced minor changes in every protocol). 288 */ 289 290int 291in6_pcbladdr(inp, nam, plocal_addr6) 292 register struct inpcb *inp; 293 struct sockaddr *nam; 294 struct in6_addr **plocal_addr6; 295{ 296 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 297 struct ifnet *ifp = NULL; 298 int error = 0; 299 300 if (nam->sa_len != sizeof (*sin6)) 301 return (EINVAL); 302 if (sin6->sin6_family != AF_INET6) 303 return (EAFNOSUPPORT); 304 if (sin6->sin6_port == 0) 305 return (EADDRNOTAVAIL); 306 307 /* KAME hack: embed scopeid */ 308 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0) 309 return EINVAL; 310 311 if (in6_ifaddr) { 312 /* 313 * If the destination address is UNSPECIFIED addr, 314 * use the loopback addr, e.g ::1. 315 */ 316 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) 317 sin6->sin6_addr = in6addr_loopback; 318 } 319 { 320 /* 321 * XXX: in6_selectsrc might replace the bound local address 322 * with the address specified by setsockopt(IPV6_PKTINFO). 323 * Is it the intended behavior? 324 */ 325 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts, 326 inp->in6p_moptions, NULL, 327 &inp->in6p_laddr, &error); 328 if (*plocal_addr6 == 0) { 329 if (error == 0) 330 error = EADDRNOTAVAIL; 331 return (error); 332 } 333 /* 334 * Don't do pcblookup call here; return interface in 335 * plocal_addr6 336 * and exit to caller, that will do the lookup. 337 */ 338 } 339 return (0); 340} 341 342/* 343 * Outer subroutine: 344 * Connect from a socket to a specified address. 345 * Both address and port must be specified in argument sin. 346 * If don't have a local address for this socket yet, 347 * then pick one. 348 */ 349int 350in6_pcbconnect(inp, nam, cred) 351 register struct inpcb *inp; 352 struct sockaddr *nam; 353 struct ucred *cred; 354{ 355 struct in6_addr *addr6; 356 register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam; 357 int error; 358 359 /* 360 * Call inner routine, to assign local interface address. 361 * in6_pcbladdr() may automatically fill in sin6_scope_id. 362 */ 363 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0) 364 return (error); 365 366 if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, 367 sin6->sin6_port, 368 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) 369 ? addr6 : &inp->in6p_laddr, 370 inp->inp_lport, 0, NULL) != NULL) { 371 return (EADDRINUSE); 372 } 373 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { 374 if (inp->inp_lport == 0) { 375 error = in6_pcbbind(inp, (struct sockaddr *)0, cred); 376 if (error) 377 return (error); 378 } 379 inp->in6p_laddr = *addr6; 380 } 381 inp->in6p_faddr = sin6->sin6_addr; 382 inp->inp_fport = sin6->sin6_port; 383 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 384 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 385 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL) 386 inp->in6p_flowinfo |= 387#ifdef RANDOM_IP_ID 388 (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); 389#else 390 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK); 391#endif 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 401void 402in6_pcbdisconnect(inp) 403 struct inpcb *inp; 404{ 405 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); 406 inp->inp_fport = 0; 407 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */ 408 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; 409 in_pcbrehash(inp); 410#ifdef IPSEC 411 ipsec_pcbdisconn(inp->inp_sp); 412#endif 413 if (inp->inp_socket->so_state & SS_NOFDREF) 414 in6_pcbdetach(inp); 415} 416 417void 418in6_pcbdetach(inp) 419 struct inpcb *inp; 420{ 421 struct socket *so = inp->inp_socket; 422 struct inpcbinfo *ipi = inp->inp_pcbinfo; 423 424#if defined(IPSEC) || defined(FAST_IPSEC) 425 if (inp->in6p_sp != NULL) 426 ipsec6_delete_pcbpolicy(inp); 427#endif /* IPSEC */ 428 inp->inp_gencnt = ++ipi->ipi_gencnt; 429 in_pcbremlists(inp); 430 431 if (so) { 432 SOCK_LOCK(so); 433 so->so_pcb = NULL; 434 sotryfree(so); 435 } 436 437 ip6_freepcbopts(inp->in6p_outputopts); 438 ip6_freemoptions(inp->in6p_moptions); 439 /* Check and free IPv4 related resources in case of mapped addr */ 440 if (inp->inp_options) 441 (void)m_free(inp->inp_options); 442 ip_freemoptions(inp->inp_moptions); 443 inp->inp_vflag = 0; 444 INP_LOCK_DESTROY(inp); 445 uma_zfree(ipi->ipi_zone, inp); 446} 447 448struct sockaddr * 449in6_sockaddr(port, addr_p) 450 in_port_t port; 451 struct in6_addr *addr_p; 452{ 453 struct sockaddr_in6 *sin6; 454 455 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK); 456 bzero(sin6, sizeof *sin6); 457 sin6->sin6_family = AF_INET6; 458 sin6->sin6_len = sizeof(*sin6); 459 sin6->sin6_port = port; 460 sin6->sin6_addr = *addr_p; 461 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 462 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); 463 else 464 sin6->sin6_scope_id = 0; /*XXX*/ 465 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 466 sin6->sin6_addr.s6_addr16[1] = 0; 467 468 return (struct sockaddr *)sin6; 469} 470 471struct sockaddr * 472in6_v4mapsin6_sockaddr(port, addr_p) 473 in_port_t port; 474 struct in_addr *addr_p; 475{ 476 struct sockaddr_in sin; 477 struct sockaddr_in6 *sin6_p; 478 479 bzero(&sin, sizeof sin); 480 sin.sin_family = AF_INET; 481 sin.sin_len = sizeof(sin); 482 sin.sin_port = port; 483 sin.sin_addr = *addr_p; 484 485 MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME, 486 M_WAITOK); 487 in6_sin_2_v4mapsin6(&sin, sin6_p); 488 489 return (struct sockaddr *)sin6_p; 490} 491 492/* 493 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was 494 * modified to match the pru_sockaddr() and pru_peeraddr() entry points 495 * in struct pr_usrreqs, so that protocols can just reference then directly 496 * without the need for a wrapper function. The socket must have a valid 497 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one 498 * except through a kernel programming error, so it is acceptable to panic 499 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap 500 * because there actually /is/ a programming error somewhere... XXX) 501 */ 502int 503in6_setsockaddr(so, nam) 504 struct socket *so; 505 struct sockaddr **nam; 506{ 507 int s; 508 register struct inpcb *inp; 509 struct in6_addr addr; 510 in_port_t port; 511 512 s = splnet(); 513 inp = sotoinpcb(so); 514 if (!inp) { 515 splx(s); 516 return EINVAL; 517 } 518 port = inp->inp_lport; 519 addr = inp->in6p_laddr; 520 splx(s); 521 522 *nam = in6_sockaddr(port, &addr); 523 return 0; 524} 525 526int 527in6_setpeeraddr(so, nam) 528 struct socket *so; 529 struct sockaddr **nam; 530{ 531 int s; 532 struct inpcb *inp; 533 struct in6_addr addr; 534 in_port_t port; 535 536 s = splnet(); 537 inp = sotoinpcb(so); 538 if (!inp) { 539 splx(s); 540 return EINVAL; 541 } 542 port = inp->inp_fport; 543 addr = inp->in6p_faddr; 544 splx(s); 545 546 *nam = in6_sockaddr(port, &addr); 547 return 0; 548} 549 550int 551in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) 552{ 553 struct inpcb *inp = sotoinpcb(so); 554 int error; 555 556 if (inp == NULL) 557 return EINVAL; 558 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 559 error = in_setsockaddr(so, nam, &tcbinfo); 560 if (error == 0) 561 in6_sin_2_v4mapsin6_in_sock(nam); 562 } else { 563 /* scope issues will be handled in in6_setsockaddr(). */ 564 error = in6_setsockaddr(so, nam); 565 } 566 567 return error; 568} 569 570int 571in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) 572{ 573 struct inpcb *inp = sotoinpcb(so); 574 int error; 575 576 if (inp == NULL) 577 return EINVAL; 578 if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) { 579 error = in_setpeeraddr(so, nam, &tcbinfo); 580 if (error == 0) 581 in6_sin_2_v4mapsin6_in_sock(nam); 582 } else 583 /* scope issues will be handled in in6_setpeeraddr(). */ 584 error = in6_setpeeraddr(so, nam); 585 586 return error; 587} 588 589/* 590 * Pass some notification to all connections of a protocol 591 * associated with address dst. The local address and/or port numbers 592 * may be specified to limit the search. The "usual action" will be 593 * taken, depending on the ctlinput cmd. The caller must filter any 594 * cmds that are uninteresting (e.g., no error in the map). 595 * Call the protocol specific routine (if any) to report 596 * any errors for each matching socket. 597 * 598 * Must be called at splnet. 599 */ 600void 601in6_pcbnotify(head, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify) 602 struct inpcbhead *head; 603 struct sockaddr *dst; 604 const struct sockaddr *src; 605 u_int fport_arg, lport_arg; 606 int cmd; 607 void *cmdarg; 608 struct inpcb *(*notify) __P((struct inpcb *, int)); 609{ 610 struct inpcb *inp, *ninp; 611 struct sockaddr_in6 sa6_src, *sa6_dst; 612 u_short fport = fport_arg, lport = lport_arg; 613 u_int32_t flowinfo; 614 int errno, s; 615 616 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) 617 return; 618 619 sa6_dst = (struct sockaddr_in6 *)dst; 620 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) 621 return; 622 623 /* 624 * note that src can be NULL when we get notify by local fragmentation. 625 */ 626 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; 627 flowinfo = sa6_src.sin6_flowinfo; 628 629 /* 630 * Redirects go to all references to the destination, 631 * and use in6_rtchange to invalidate the route cache. 632 * Dead host indications: also use in6_rtchange to invalidate 633 * the cache, and deliver the error to all the sockets. 634 * Otherwise, if we have knowledge of the local port and address, 635 * deliver only to that socket. 636 */ 637 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 638 fport = 0; 639 lport = 0; 640 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); 641 642 if (cmd != PRC_HOSTDEAD) 643 notify = in6_rtchange; 644 } 645 errno = inet6ctlerrmap[cmd]; 646 s = splnet(); 647 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { 648 ninp = LIST_NEXT(inp, inp_list); 649 650 if ((inp->inp_vflag & INP_IPV6) == 0) 651 continue; 652 653 /* 654 * If the error designates a new path MTU for a destination 655 * and the application (associated with this socket) wanted to 656 * know the value, notify. Note that we notify for all 657 * disconnected sockets if the corresponding application 658 * wanted. This is because some UDP applications keep sending 659 * sockets disconnected. 660 * XXX: should we avoid to notify the value to TCP sockets? 661 */ 662 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 && 663 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) || 664 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) { 665 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, 666 (u_int32_t *)cmdarg); 667 } 668 669 /* 670 * Detect if we should notify the error. If no source and 671 * destination ports are specifed, but non-zero flowinfo and 672 * local address match, notify the error. This is the case 673 * when the error is delivered with an encrypted buffer 674 * by ESP. Otherwise, just compare addresses and ports 675 * as usual. 676 */ 677 if (lport == 0 && fport == 0 && flowinfo && 678 inp->inp_socket != NULL && 679 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && 680 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr)) 681 goto do_notify; 682 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, 683 &sa6_dst->sin6_addr) || 684 inp->inp_socket == 0 || 685 (lport && inp->inp_lport != lport) || 686 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && 687 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 688 &sa6_src.sin6_addr)) || 689 (fport && inp->inp_fport != fport)) 690 continue; 691 692 do_notify: 693 if (notify) 694 (*notify)(inp, errno); 695 } 696 splx(s); 697} 698 699/* 700 * Lookup a PCB based on the local address and port. 701 */ 702struct inpcb * 703in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay) 704 struct inpcbinfo *pcbinfo; 705 struct in6_addr *laddr; 706 u_int lport_arg; 707 int wild_okay; 708{ 709 register struct inpcb *inp; 710 int matchwild = 3, wildcard; 711 u_short lport = lport_arg; 712 713 if (!wild_okay) { 714 struct inpcbhead *head; 715 /* 716 * Look for an unconnected (wildcard foreign addr) PCB that 717 * matches the local address and port we're looking for. 718 */ 719 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 720 pcbinfo->hashmask)]; 721 LIST_FOREACH(inp, head, inp_hash) { 722 if ((inp->inp_vflag & INP_IPV6) == 0) 723 continue; 724 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 725 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 726 inp->inp_lport == lport) { 727 /* 728 * Found. 729 */ 730 return (inp); 731 } 732 } 733 /* 734 * Not found. 735 */ 736 return (NULL); 737 } else { 738 struct inpcbporthead *porthash; 739 struct inpcbport *phd; 740 struct inpcb *match = NULL; 741 /* 742 * Best fit PCB lookup. 743 * 744 * First see if this local port is in use by looking on the 745 * port hash list. 746 */ 747 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport, 748 pcbinfo->porthashmask)]; 749 LIST_FOREACH(phd, porthash, phd_hash) { 750 if (phd->phd_port == lport) 751 break; 752 } 753 if (phd != NULL) { 754 /* 755 * Port is in use by one or more PCBs. Look for best 756 * fit. 757 */ 758 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { 759 wildcard = 0; 760 if ((inp->inp_vflag & INP_IPV6) == 0) 761 continue; 762 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) 763 wildcard++; 764 if (!IN6_IS_ADDR_UNSPECIFIED( 765 &inp->in6p_laddr)) { 766 if (IN6_IS_ADDR_UNSPECIFIED(laddr)) 767 wildcard++; 768 else if (!IN6_ARE_ADDR_EQUAL( 769 &inp->in6p_laddr, laddr)) 770 continue; 771 } else { 772 if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) 773 wildcard++; 774 } 775 if (wildcard < matchwild) { 776 match = inp; 777 matchwild = wildcard; 778 if (matchwild == 0) { 779 break; 780 } 781 } 782 } 783 } 784 return (match); 785 } 786} 787 788void 789in6_pcbpurgeif0(head, ifp) 790 struct in6pcb *head; 791 struct ifnet *ifp; 792{ 793 struct in6pcb *in6p; 794 struct ip6_moptions *im6o; 795 struct in6_multi_mship *imm, *nimm; 796 797 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) { 798 im6o = in6p->in6p_moptions; 799 if ((in6p->inp_vflag & INP_IPV6) && 800 im6o) { 801 /* 802 * Unselect the outgoing interface if it is being 803 * detached. 804 */ 805 if (im6o->im6o_multicast_ifp == ifp) 806 im6o->im6o_multicast_ifp = NULL; 807 808 /* 809 * Drop multicast group membership if we joined 810 * through the interface being detached. 811 * XXX controversial - is it really legal for kernel 812 * to force this? 813 */ 814 for (imm = im6o->im6o_memberships.lh_first; 815 imm != NULL; imm = nimm) { 816 nimm = imm->i6mm_chain.le_next; 817 if (imm->i6mm_maddr->in6m_ifp == ifp) { 818 LIST_REMOVE(imm, i6mm_chain); 819 in6_delmulti(imm->i6mm_maddr); 820 free(imm, M_IPMADDR); 821 } 822 } 823 } 824 } 825} 826 827/* 828 * Check for alternatives when higher level complains 829 * about service problems. For now, invalidate cached 830 * routing information. If the route was created dynamically 831 * (by a redirect), time to try a default gateway again. 832 */ 833void 834in6_losing(in6p) 835 struct inpcb *in6p; 836{ 837 /* 838 * We don't store route pointers in the routing table anymore 839 */ 840 return; 841} 842 843/* 844 * After a routing change, flush old routing 845 * and allocate a (hopefully) better one. 846 */ 847struct inpcb * 848in6_rtchange(inp, errno) 849 struct inpcb *inp; 850 int errno; 851{ 852 /* 853 * We don't store route pointers in the routing table anymore 854 */ 855 return inp; 856} 857 858/* 859 * Lookup PCB in hash list. 860 */ 861struct inpcb * 862in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp) 863 struct inpcbinfo *pcbinfo; 864 struct in6_addr *faddr, *laddr; 865 u_int fport_arg, lport_arg; 866 int wildcard; 867 struct ifnet *ifp; 868{ 869 struct inpcbhead *head; 870 register struct inpcb *inp; 871 u_short fport = fport_arg, lport = lport_arg; 872 int faith; 873 874 if (faithprefix_p != NULL) 875 faith = (*faithprefix_p)(laddr); 876 else 877 faith = 0; 878 879 /* 880 * First look for an exact match. 881 */ 882 head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, 883 lport, fport, 884 pcbinfo->hashmask)]; 885 LIST_FOREACH(inp, head, inp_hash) { 886 if ((inp->inp_vflag & INP_IPV6) == 0) 887 continue; 888 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && 889 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) && 890 inp->inp_fport == fport && 891 inp->inp_lport == lport) { 892 /* 893 * Found. 894 */ 895 return (inp); 896 } 897 } 898 if (wildcard) { 899 struct inpcb *local_wild = NULL; 900 901 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, 902 pcbinfo->hashmask)]; 903 LIST_FOREACH(inp, head, inp_hash) { 904 if ((inp->inp_vflag & INP_IPV6) == 0) 905 continue; 906 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && 907 inp->inp_lport == lport) { 908 if (faith && (inp->inp_flags & INP_FAITH) == 0) 909 continue; 910 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, 911 laddr)) 912 return (inp); 913 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) 914 local_wild = inp; 915 } 916 } 917 return (local_wild); 918 } 919 920 /* 921 * Not found. 922 */ 923 return (NULL); 924} 925 926void 927init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) 928{ 929 struct ip6_hdr *ip; 930 931 ip = mtod(m, struct ip6_hdr *); 932 bzero(sin6, sizeof(*sin6)); 933 sin6->sin6_len = sizeof(*sin6); 934 sin6->sin6_family = AF_INET6; 935 sin6->sin6_addr = ip->ip6_src; 936 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 937 sin6->sin6_addr.s6_addr16[1] = 0; 938 sin6->sin6_scope_id = 939 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) 940 ? m->m_pkthdr.rcvif->if_index : 0; 941 942 return; 943} 944