sys/netinet6/in6_pcb.c

   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/priv.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 #include <netinet6/scope6_var.h>
 101
 102 #ifdef IPSEC
 103 #include <netinet6/ipsec.h>
 104 #ifdef INET6
 105 #include <netinet6/ipsec6.h>
 106 #endif
 107 #include <netinet6/ah.h>
 108 #ifdef INET6
 109 #include <netinet6/ah6.h>
 110 #endif
 111 #include <netkey/key.h>
 112 #endif /* IPSEC */
 113
 114 #ifdef FAST_IPSEC
 115 #include <netipsec/ipsec.h>
 116 #include <netipsec/ipsec6.h>
 117 #include <netipsec/key.h>
 118 #endif /* FAST_IPSEC */
 119
 120 struct  in6_addr zeroin6_addr;
 121
 122 int
 123 in6_pcbbind(inp, nam, cred)
 124         register struct inpcb *inp;
 125         struct sockaddr *nam;
 126         struct ucred *cred;
 127 {
 128         struct socket *so = inp->inp_socket;
 129         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 130         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 131         u_short lport = 0;
 132         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 133
 134         INP_INFO_WLOCK_ASSERT(pcbinfo);
 135         INP_LOCK_ASSERT(inp);
 136
 137         if (!in6_ifaddr) /* XXX broken! */
 138                 return (EADDRNOTAVAIL);
 139         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 140                 return (EINVAL);
 141         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 142                 wild = INPLOOKUP_WILDCARD;
 143         if (nam) {
 144                 int error;
 145
 146                 sin6 = (struct sockaddr_in6 *)nam;
 147                 if (nam->sa_len != sizeof(*sin6))
 148                         return (EINVAL);
 149                 /*
 150                  * family check.
 151                  */
 152                 if (nam->sa_family != AF_INET6)
 153                         return (EAFNOSUPPORT);
 154
 155                 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
 156                         return(error);
 157
 158                 lport = sin6->sin6_port;
 159                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 160                         /*
 161                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 162                          * allow compepte duplication of binding if
 163                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 164                          * and a multicast address is bound on both
 165                          * new and duplicated sockets.
 166                          */
 167                         if (so->so_options & SO_REUSEADDR)
 168                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 169                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 170                         struct ifaddr *ia = NULL;
 171
 172                         sin6->sin6_port = 0;            /* yech... */
 173                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
 174                                 return (EADDRNOTAVAIL);
 175
 176                         /*
 177                          * XXX: bind to an anycast address might accidentally
 178                          * cause sending a packet with anycast source address.
 179                          * We should allow to bind to a deprecated address, since
 180                          * the application dares to use it.
 181                          */
 182                         if (ia &&
 183                             ((struct in6_ifaddr *)ia)->ia6_flags &
 184                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 185                                 return (EADDRNOTAVAIL);
 186                         }
 187                 }
 188                 if (lport) {
 189                         struct inpcb *t;
 190
 191                         /* GROSS */
 192                         if (ntohs(lport) <= ipport_reservedhigh &&
 193                             ntohs(lport) >= ipport_reservedlow &&
 194                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 195                             0))
 196                                 return (EACCES);
 197                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
 198                             priv_check_cred(so->so_cred,
 199                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 200                                 t = in6_pcblookup_local(pcbinfo,
 201                                     &sin6->sin6_addr, lport,
 202                                     INPLOOKUP_WILDCARD);
 203                                 if (t &&
 204                                     ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
 205                                     (so->so_type != SOCK_STREAM ||
 206                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
 207                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 208                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 209                                      (t->inp_socket->so_options & SO_REUSEPORT)
 210                                       == 0) && (so->so_cred->cr_uid !=
 211                                      t->inp_socket->so_cred->cr_uid))
 212                                         return (EADDRINUSE);
 213                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 214                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 215                                         struct sockaddr_in sin;
 216
 217                                         in6_sin6_2_sin(&sin, sin6);
 218                                         t = in_pcblookup_local(pcbinfo,
 219                                                 sin.sin_addr, lport,
 220                                                 INPLOOKUP_WILDCARD);
 221                                         if (t &&
 222                                             ((t->inp_vflag &
 223                                               INP_TIMEWAIT) == 0) &&
 224                                             (so->so_type != SOCK_STREAM ||
 225                                              ntohl(t->inp_faddr.s_addr) ==
 226                                               INADDR_ANY) &&
 227                                             (so->so_cred->cr_uid !=
 228                                              t->inp_socket->so_cred->cr_uid))
 229                                                 return (EADDRINUSE);
 230                                 }
 231                         }
 232                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 233                                                 lport, wild);
 234                         if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
 235                             intotw(t)->tw_so_options :
 236                             t->inp_socket->so_options)) == 0)
 237                                 return (EADDRINUSE);
 238                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 239                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 240                                 struct sockaddr_in sin;
 241
 242                                 in6_sin6_2_sin(&sin, sin6);
 243                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 244                                                        lport, wild);
 245                                 if (t && t->inp_vflag & INP_TIMEWAIT) {
 246                                         if ((reuseport &
 247                                             intotw(t)->tw_so_options) == 0 &&
 248                                             (ntohl(t->inp_laddr.s_addr) !=
 249                                              INADDR_ANY || ((inp->inp_vflag &
 250                                              INP_IPV6PROTO) ==
 251                                              (t->inp_vflag & INP_IPV6PROTO))))
 252                                                 return (EADDRINUSE);
 253                                 }
 254                                 else if (t &&
 255                                     (reuseport & t->inp_socket->so_options)
 256                                     == 0 && (ntohl(t->inp_laddr.s_addr) !=
 257                                     INADDR_ANY || INP_SOCKAF(so) ==
 258                                      INP_SOCKAF(t->inp_socket)))
 259                                         return (EADDRINUSE);
 260                         }
 261                 }
 262                 inp->in6p_laddr = sin6->sin6_addr;
 263         }
 264         if (lport == 0) {
 265                 int e;
 266                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
 267                         return (e);
 268         }
 269         else {
 270                 inp->inp_lport = lport;
 271                 if (in_pcbinshash(inp) != 0) {
 272                         inp->in6p_laddr = in6addr_any;
 273                         inp->inp_lport = 0;
 274                         return (EAGAIN);
 275                 }
 276         }
 277         return (0);
 278 }
 279
 280 /*
 281  *   Transform old in6_pcbconnect() into an inner subroutine for new
 282  *   in6_pcbconnect(): Do some validity-checking on the remote
 283  *   address (in mbuf 'nam') and then determine local host address
 284  *   (i.e., which interface) to use to access that remote host.
 285  *
 286  *   This preserves definition of in6_pcbconnect(), while supporting a
 287  *   slightly different version for T/TCP.  (This is more than
 288  *   a bit of a kludge, but cleaning up the internal interfaces would
 289  *   have forced minor changes in every protocol).
 290  */
 291
 292 int
 293 in6_pcbladdr(inp, nam, plocal_addr6)
 294         register struct inpcb *inp;
 295         struct sockaddr *nam;
 296         struct in6_addr **plocal_addr6;
 297 {
 298         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 299         int error = 0;
 300         struct ifnet *ifp = NULL;
 301         int scope_ambiguous = 0;
 302
 303         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 304         INP_LOCK_ASSERT(inp);
 305
 306         if (nam->sa_len != sizeof (*sin6))
 307                 return (EINVAL);
 308         if (sin6->sin6_family != AF_INET6)
 309                 return (EAFNOSUPPORT);
 310         if (sin6->sin6_port == 0)
 311                 return (EADDRNOTAVAIL);
 312
 313         if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
 314                 scope_ambiguous = 1;
 315         if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
 316                 return(error);
 317
 318         if (in6_ifaddr) {
 319                 /*
 320                  * If the destination address is UNSPECIFIED addr,
 321                  * use the loopback addr, e.g ::1.
 322                  */
 323                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 324                         sin6->sin6_addr = in6addr_loopback;
 325         }
 326
 327         /*
 328          * XXX: in6_selectsrc might replace the bound local address
 329          * with the address specified by setsockopt(IPV6_PKTINFO).
 330          * Is it the intended behavior?
 331          */
 332         *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 333                                       inp->in6p_moptions, NULL,
 334                                       &inp->in6p_laddr, &ifp, &error);
 335         if (ifp && scope_ambiguous &&
 336             (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
 337                 return(error);
 338         }
 339
 340         if (*plocal_addr6 == 0) {
 341                 if (error == 0)
 342                         error = EADDRNOTAVAIL;
 343                 return (error);
 344         }
 345         /*
 346          * Don't do pcblookup call here; return interface in
 347          * plocal_addr6
 348          * and exit to caller, that will do the lookup.
 349          */
 350
 351         return (0);
 352 }
 353
 354 /*
 355  * Outer subroutine:
 356  * Connect from a socket to a specified address.
 357  * Both address and port must be specified in argument sin.
 358  * If don't have a local address for this socket yet,
 359  * then pick one.
 360  */
 361 int
 362 in6_pcbconnect(inp, nam, cred)
 363         register struct inpcb *inp;
 364         struct sockaddr *nam;
 365         struct ucred *cred;
 366 {
 367         struct in6_addr *addr6;
 368         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 369         int error;
 370
 371         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 372         INP_LOCK_ASSERT(inp);
 373
 374         /*
 375          * Call inner routine, to assign local interface address.
 376          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 377          */
 378         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 379                 return (error);
 380
 381         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
 382                                sin6->sin6_port,
 383                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 384                               ? addr6 : &inp->in6p_laddr,
 385                               inp->inp_lport, 0, NULL) != NULL) {
 386                 return (EADDRINUSE);
 387         }
 388         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 389                 if (inp->inp_lport == 0) {
 390                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
 391                         if (error)
 392                                 return (error);
 393                 }
 394                 inp->in6p_laddr = *addr6;
 395         }
 396         inp->in6p_faddr = sin6->sin6_addr;
 397         inp->inp_fport = sin6->sin6_port;
 398         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 399         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 400         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 401                 inp->in6p_flowinfo |=
 402                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 403
 404         in_pcbrehash(inp);
 405 #ifdef IPSEC
 406         if (inp->inp_socket->so_type == SOCK_STREAM)
 407                 ipsec_pcbconn(inp->inp_sp);
 408 #endif
 409         return (0);
 410 }
 411
 412 void
 413 in6_pcbdisconnect(inp)
 414         struct inpcb *inp;
 415 {
 416
 417         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 418         INP_LOCK_ASSERT(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 #ifdef IPSEC
 426         ipsec_pcbdisconn(inp->inp_sp);
 427 #endif
 428 }
 429
 430 void
 431 in6_pcbdetach(struct inpcb *inp)
 432 {
 433
 434         KASSERT(inp->inp_socket != NULL, ("in6_pcbdetach: inp_socket == NULL"));
 435         inp->inp_socket->so_pcb = NULL;
 436         inp->inp_socket = NULL;
 437 }
 438
 439 void
 440 in6_pcbfree(struct inpcb *inp)
 441 {
 442         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 443
 444         KASSERT(inp->inp_socket == NULL, ("in6_pcbfree: inp_socket != NULL"));
 445         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 446         INP_LOCK_ASSERT(inp);
 447
 448 #if defined(IPSEC) || defined(FAST_IPSEC)
 449         if (inp->in6p_sp != NULL)
 450                 ipsec6_delete_pcbpolicy(inp);
 451 #endif /* IPSEC */
 452         inp->inp_gencnt = ++ipi->ipi_gencnt;
 453         in_pcbremlists(inp);
 454         ip6_freepcbopts(inp->in6p_outputopts);
 455         ip6_freemoptions(inp->in6p_moptions);
 456         /* Check and free IPv4 related resources in case of mapped addr */
 457         if (inp->inp_options)
 458                 (void)m_free(inp->inp_options);
 459         if (inp->inp_moptions != NULL)
 460                 inp_freemoptions(inp->inp_moptions);
 461         inp->inp_vflag = 0;
 462         INP_UNLOCK(inp);
 463         uma_zfree(ipi->ipi_zone, inp);
 464 }
 465
 466 struct sockaddr *
 467 in6_sockaddr(port, addr_p)
 468         in_port_t port;
 469         struct in6_addr *addr_p;
 470 {
 471         struct sockaddr_in6 *sin6;
 472
 473         MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
 474         bzero(sin6, sizeof *sin6);
 475         sin6->sin6_family = AF_INET6;
 476         sin6->sin6_len = sizeof(*sin6);
 477         sin6->sin6_port = port;
 478         sin6->sin6_addr = *addr_p;
 479         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
 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 int
 506 in6_getsockaddr(so, nam)
 507         struct socket *so;
 508         struct sockaddr **nam;
 509 {
 510         register struct inpcb *inp;
 511         struct in6_addr addr;
 512         in_port_t port;
 513
 514         inp = sotoinpcb(so);
 515         KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
 516
 517         INP_LOCK(inp);
 518         port = inp->inp_lport;
 519         addr = inp->in6p_laddr;
 520         INP_UNLOCK(inp);
 521
 522         *nam = in6_sockaddr(port, &addr);
 523         return 0;
 524 }
 525
 526 int
 527 in6_getpeeraddr(so, nam)
 528         struct socket *so;
 529         struct sockaddr **nam;
 530 {
 531         struct inpcb *inp;
 532         struct in6_addr addr;
 533         in_port_t port;
 534
 535         inp = sotoinpcb(so);
 536         KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
 537
 538         INP_LOCK(inp);
 539         port = inp->inp_fport;
 540         addr = inp->in6p_faddr;
 541         INP_UNLOCK(inp);
 542
 543         *nam = in6_sockaddr(port, &addr);
 544         return 0;
 545 }
 546
 547 int
 548 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 549 {
 550         struct  inpcb *inp;
 551         int     error;
 552
 553         inp = sotoinpcb(so);
 554         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
 555
 556         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 557                 error = in_getsockaddr(so, nam);
 558                 if (error == 0)
 559                         in6_sin_2_v4mapsin6_in_sock(nam);
 560         } else {
 561                 /* scope issues will be handled in in6_getsockaddr(). */
 562                 error = in6_getsockaddr(so, nam);
 563         }
 564
 565         return error;
 566 }
 567
 568 int
 569 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 570 {
 571         struct  inpcb *inp;
 572         int     error;
 573
 574         inp = sotoinpcb(so);
 575         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
 576
 577         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 578                 error = in_getpeeraddr(so, nam);
 579                 if (error == 0)
 580                         in6_sin_2_v4mapsin6_in_sock(nam);
 581         } else
 582         /* scope issues will be handled in in6_getpeeraddr(). */
 583         error = in6_getpeeraddr(so, nam);
 584
 585         return error;
 586 }
 587
 588 /*
 589  * Pass some notification to all connections of a protocol
 590  * associated with address dst.  The local address and/or port numbers
 591  * may be specified to limit the search.  The "usual action" will be
 592  * taken, depending on the ctlinput cmd.  The caller must filter any
 593  * cmds that are uninteresting (e.g., no error in the map).
 594  * Call the protocol specific routine (if any) to report
 595  * any errors for each matching socket.
 596  */
 597 void
 598 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify)
 599         struct inpcbinfo *pcbinfo;
 600         struct sockaddr *dst;
 601         const struct sockaddr *src;
 602         u_int fport_arg, lport_arg;
 603         int cmd;
 604         void *cmdarg;
 605         struct inpcb *(*notify) __P((struct inpcb *, int));
 606 {
 607         struct inpcbhead *head;
 608         struct inpcb *inp, *ninp;
 609         struct sockaddr_in6 sa6_src, *sa6_dst;
 610         u_short fport = fport_arg, lport = lport_arg;
 611         u_int32_t flowinfo;
 612         int errno;
 613
 614         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 615                 return;
 616
 617         sa6_dst = (struct sockaddr_in6 *)dst;
 618         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 619                 return;
 620
 621         /*
 622          * note that src can be NULL when we get notify by local fragmentation.
 623          */
 624         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 625         flowinfo = sa6_src.sin6_flowinfo;
 626
 627         /*
 628          * Redirects go to all references to the destination,
 629          * and use in6_rtchange to invalidate the route cache.
 630          * Dead host indications: also use in6_rtchange to invalidate
 631          * the cache, and deliver the error to all the sockets.
 632          * Otherwise, if we have knowledge of the local port and address,
 633          * deliver only to that socket.
 634          */
 635         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 636                 fport = 0;
 637                 lport = 0;
 638                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 639
 640                 if (cmd != PRC_HOSTDEAD)
 641                         notify = in6_rtchange;
 642         }
 643         errno = inet6ctlerrmap[cmd];
 644         head = pcbinfo->ipi_listhead;
 645         INP_INFO_WLOCK(pcbinfo);
 646         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 647                 INP_LOCK(inp);
 648                 ninp = LIST_NEXT(inp, inp_list);
 649
 650                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 651                         INP_UNLOCK(inp);
 652                         continue;
 653                 }
 654
 655                 /*
 656                  * If the error designates a new path MTU for a destination
 657                  * and the application (associated with this socket) wanted to
 658                  * know the value, notify. Note that we notify for all
 659                  * disconnected sockets if the corresponding application
 660                  * wanted. This is because some UDP applications keep sending
 661                  * sockets disconnected.
 662                  * XXX: should we avoid to notify the value to TCP sockets?
 663                  */
 664                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 665                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 666                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 667                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
 668                                         (u_int32_t *)cmdarg);
 669                 }
 670
 671                 /*
 672                  * Detect if we should notify the error. If no source and
 673                  * destination ports are specifed, but non-zero flowinfo and
 674                  * local address match, notify the error. This is the case
 675                  * when the error is delivered with an encrypted buffer
 676                  * by ESP. Otherwise, just compare addresses and ports
 677                  * as usual.
 678                  */
 679                 if (lport == 0 && fport == 0 && flowinfo &&
 680                     inp->inp_socket != NULL &&
 681                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 682                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 683                         goto do_notify;
 684                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 685                                              &sa6_dst->sin6_addr) ||
 686                          inp->inp_socket == 0 ||
 687                          (lport && inp->inp_lport != lport) ||
 688                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 689                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 690                                               &sa6_src.sin6_addr)) ||
 691                          (fport && inp->inp_fport != fport)) {
 692                         INP_UNLOCK(inp);
 693                         continue;
 694                 }
 695
 696           do_notify:
 697                 if (notify) {
 698                         if ((*notify)(inp, errno))
 699                                 INP_UNLOCK(inp);
 700                 } else
 701                         INP_UNLOCK(inp);
 702         }
 703         INP_INFO_WUNLOCK(pcbinfo);
 704 }
 705
 706 /*
 707  * Lookup a PCB based on the local address and port.
 708  */
 709 struct inpcb *
 710 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 711         struct inpcbinfo *pcbinfo;
 712         struct in6_addr *laddr;
 713         u_int lport_arg;
 714         int wild_okay;
 715 {
 716         register struct inpcb *inp;
 717         int matchwild = 3, wildcard;
 718         u_short lport = lport_arg;
 719
 720         INP_INFO_WLOCK_ASSERT(pcbinfo);
 721
 722         if (!wild_okay) {
 723                 struct inpcbhead *head;
 724                 /*
 725                  * Look for an unconnected (wildcard foreign addr) PCB that
 726                  * matches the local address and port we're looking for.
 727                  */
 728                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 729                     0, pcbinfo->ipi_hashmask)];
 730                 LIST_FOREACH(inp, head, inp_hash) {
 731                         if ((inp->inp_vflag & INP_IPV6) == 0)
 732                                 continue;
 733                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 734                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 735                             inp->inp_lport == lport) {
 736                                 /*
 737                                  * Found.
 738                                  */
 739                                 return (inp);
 740                         }
 741                 }
 742                 /*
 743                  * Not found.
 744                  */
 745                 return (NULL);
 746         } else {
 747                 struct inpcbporthead *porthash;
 748                 struct inpcbport *phd;
 749                 struct inpcb *match = NULL;
 750                 /*
 751                  * Best fit PCB lookup.
 752                  *
 753                  * First see if this local port is in use by looking on the
 754                  * port hash list.
 755                  */
 756                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 757                     pcbinfo->ipi_porthashmask)];
 758                 LIST_FOREACH(phd, porthash, phd_hash) {
 759                         if (phd->phd_port == lport)
 760                                 break;
 761                 }
 762                 if (phd != NULL) {
 763                         /*
 764                          * Port is in use by one or more PCBs. Look for best
 765                          * fit.
 766                          */
 767                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 768                                 wildcard = 0;
 769                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 770                                         continue;
 771                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 772                                         wildcard++;
 773                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 774                                         &inp->in6p_laddr)) {
 775                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 776                                                 wildcard++;
 777                                         else if (!IN6_ARE_ADDR_EQUAL(
 778                                                 &inp->in6p_laddr, laddr))
 779                                                 continue;
 780                                 } else {
 781                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 782                                                 wildcard++;
 783                                 }
 784                                 if (wildcard < matchwild) {
 785                                         match = inp;
 786                                         matchwild = wildcard;
 787                                         if (matchwild == 0) {
 788                                                 break;
 789                                         }
 790                                 }
 791                         }
 792                 }
 793                 return (match);
 794         }
 795 }
 796
 797 void
 798 in6_pcbpurgeif0(pcbinfo, ifp)
 799         struct inpcbinfo *pcbinfo;
 800         struct ifnet *ifp;
 801 {
 802         struct in6pcb *in6p;
 803         struct ip6_moptions *im6o;
 804         struct in6_multi_mship *imm, *nimm;
 805
 806         INP_INFO_RLOCK(pcbinfo);
 807         LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
 808                 INP_LOCK(in6p);
 809                 im6o = in6p->in6p_moptions;
 810                 if ((in6p->inp_vflag & INP_IPV6) &&
 811                     im6o) {
 812                         /*
 813                          * Unselect the outgoing interface if it is being
 814                          * detached.
 815                          */
 816                         if (im6o->im6o_multicast_ifp == ifp)
 817                                 im6o->im6o_multicast_ifp = NULL;
 818
 819                         /*
 820                          * Drop multicast group membership if we joined
 821                          * through the interface being detached.
 822                          * XXX controversial - is it really legal for kernel
 823                          * to force this?
 824                          */
 825                         for (imm = im6o->im6o_memberships.lh_first;
 826                              imm != NULL; imm = nimm) {
 827                                 nimm = imm->i6mm_chain.le_next;
 828                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 829                                         LIST_REMOVE(imm, i6mm_chain);
 830                                         in6_delmulti(imm->i6mm_maddr);
 831                                         free(imm, M_IP6MADDR);
 832                                 }
 833                         }
 834                 }
 835                 INP_UNLOCK(in6p);
 836         }
 837         INP_INFO_RUNLOCK(pcbinfo);
 838 }
 839
 840 /*
 841  * Check for alternatives when higher level complains
 842  * about service problems.  For now, invalidate cached
 843  * routing information.  If the route was created dynamically
 844  * (by a redirect), time to try a default gateway again.
 845  */
 846 void
 847 in6_losing(in6p)
 848         struct inpcb *in6p;
 849 {
 850         /*
 851          * We don't store route pointers in the routing table anymore
 852          */
 853         return;
 854 }
 855
 856 /*
 857  * After a routing change, flush old routing
 858  * and allocate a (hopefully) better one.
 859  */
 860 struct inpcb *
 861 in6_rtchange(inp, errno)
 862         struct inpcb *inp;
 863         int errno;
 864 {
 865         /*
 866          * We don't store route pointers in the routing table anymore
 867          */
 868         return inp;
 869 }
 870
 871 /*
 872  * Lookup PCB in hash list.
 873  */
 874 struct inpcb *
 875 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
 876         struct inpcbinfo *pcbinfo;
 877         struct in6_addr *faddr, *laddr;
 878         u_int fport_arg, lport_arg;
 879         int wildcard;
 880         struct ifnet *ifp;
 881 {
 882         struct inpcbhead *head;
 883         register struct inpcb *inp;
 884         u_short fport = fport_arg, lport = lport_arg;
 885         int faith;
 886
 887         INP_INFO_RLOCK_ASSERT(pcbinfo);
 888
 889         if (faithprefix_p != NULL)
 890                 faith = (*faithprefix_p)(laddr);
 891         else
 892                 faith = 0;
 893
 894         /*
 895          * First look for an exact match.
 896          */
 897         head = &pcbinfo->ipi_hashbase[
 898             INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport,
 899             pcbinfo->ipi_hashmask)];
 900         LIST_FOREACH(inp, head, inp_hash) {
 901                 if ((inp->inp_vflag & INP_IPV6) == 0)
 902                         continue;
 903                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 904                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 905                     inp->inp_fport == fport &&
 906                     inp->inp_lport == lport) {
 907                         /*
 908                          * Found.
 909                          */
 910                         return (inp);
 911                 }
 912         }
 913         if (wildcard) {
 914                 struct inpcb *local_wild = NULL;
 915
 916                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 917                     0, pcbinfo->ipi_hashmask)];
 918                 LIST_FOREACH(inp, head, inp_hash) {
 919                         if ((inp->inp_vflag & INP_IPV6) == 0)
 920                                 continue;
 921                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 922                             inp->inp_lport == lport) {
 923                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
 924                                         continue;
 925                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 926                                                        laddr))
 927                                         return (inp);
 928                                 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 929                                         local_wild = inp;
 930                         }
 931                 }
 932                 return (local_wild);
 933         }
 934
 935         /*
 936          * Not found.
 937          */
 938         return (NULL);
 939 }
 940
 941 void
 942 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
 943 {
 944         struct ip6_hdr *ip;
 945
 946         ip = mtod(m, struct ip6_hdr *);
 947         bzero(sin6, sizeof(*sin6));
 948         sin6->sin6_len = sizeof(*sin6);
 949         sin6->sin6_family = AF_INET6;
 950         sin6->sin6_addr = ip->ip6_src;
 951
 952         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
 953
 954         return;
 955 }