sys/netinet6/in6_pcb.c

   1 /*      $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $   */
   2 /*      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $        */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 /*
  35  * Copyright (c) 1982, 1986, 1991, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. 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
  68 #include <sys/param.h>
  69 #include <sys/systm.h>
  70 #include <sys/malloc.h>
  71 #include <sys/mbuf.h>
  72 #include <sys/domain.h>
  73 #include <sys/protosw.h>
  74 #include <sys/socket.h>
  75 #include <sys/socketvar.h>
  76 #include <sys/sockio.h>
  77 #include <sys/errno.h>
  78 #include <sys/time.h>
  79 #include <sys/proc.h>
  80 #include <sys/priv.h>
  81 #include <sys/jail.h>
  82
  83 #include <sys/thread2.h>
  84 #include <sys/msgport2.h>
  85
  86 #include <vm/vm_zone.h>
  87
  88 #include <net/if.h>
  89 #include <net/if_types.h>
  90 #include <net/route.h>
  91 #include <net/netisr2.h>
  92
  93 #include <netinet/in.h>
  94 #include <netinet/in_var.h>
  95 #include <netinet/in_systm.h>
  96 #include <netinet/ip6.h>
  97 #include <netinet/ip_var.h>
  98 #include <netinet6/ip6_var.h>
  99 #include <netinet6/nd6.h>
 100 #include <netinet/in_pcb.h>
 101 #include <netinet6/in6_pcb.h>
 102
 103 struct  in6_addr zeroin6_addr;
 104
 105 int
 106 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 107 {
 108         struct socket *so = inp->inp_socket;
 109         struct sockaddr_in6 jsin6;
 110         int error;
 111
 112         if (!in6_ifaddr) /* XXX broken! */
 113                 return (EADDRNOTAVAIL);
 114         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 115                 return (EINVAL);
 116
 117         if (nam) {
 118                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 119                 struct inpcbinfo *pcbinfo;
 120                 struct inpcbportinfo *portinfo;
 121                 struct inpcbporthead *porthash;
 122                 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 123                 struct ucred *cred = NULL;
 124                 struct inpcb *t;
 125                 u_short lport, lport_ho;
 126
 127                 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 128                         wild = 1;
 129                 if (td->td_proc != NULL)
 130                         cred = td->td_proc->p_ucred;
 131
 132                 if (nam->sa_len != sizeof(*sin6))
 133                         return (EINVAL);
 134                 /*
 135                  * family check.
 136                  */
 137                 if (nam->sa_family != AF_INET6)
 138                         return (EAFNOSUPPORT);
 139
 140                 /* Reject v4-mapped address */
 141                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 142                         return (EADDRNOTAVAIL);
 143
 144                 if (!prison_replace_wildcards(td, nam))
 145                         return (EINVAL);
 146
 147                 /* KAME hack: embed scopeid */
 148                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
 149                         return (EINVAL);
 150                 /* this must be cleared for ifa_ifwithaddr() */
 151                 sin6->sin6_scope_id = 0;
 152
 153                 lport = sin6->sin6_port;
 154                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 155                         /*
 156                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 157                          * allow compepte duplication of binding if
 158                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 159                          * and a multicast address is bound on both
 160                          * new and duplicated sockets.
 161                          */
 162                         if (so->so_options & SO_REUSEADDR)
 163                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 164                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 165                         struct ifaddr *ia = NULL;
 166
 167                         sin6->sin6_port = 0;            /* yech... */
 168                         if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
 169                                 sin6->sin6_addr = kin6addr_any;
 170                                 return (EINVAL);
 171                         }
 172                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL)
 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                 inp->in6p_laddr = sin6->sin6_addr;
 188
 189                 if (lport == 0)
 190                         goto auto_select;
 191                 lport_ho = ntohs(lport);
 192
 193                 /* GROSS */
 194                 if (lport_ho < IPV6PORT_RESERVED && cred &&
 195                     priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0)) {
 196                         inp->in6p_laddr = kin6addr_any;
 197                         return (EACCES);
 198                 }
 199
 200                 /*
 201                  * Locate the proper portinfo based on lport
 202                  */
 203                 pcbinfo = inp->inp_pcbinfo;
 204                 portinfo =
 205                     &pcbinfo->portinfo[lport_ho % pcbinfo->portinfo_cnt];
 206                 KKASSERT((lport_ho % pcbinfo->portinfo_cnt) ==
 207                     portinfo->offset);
 208
 209                 /*
 210                  * This has to be atomic.  If the porthash is shared across
 211                  * multiple protocol threads (aka tcp) then the token must
 212                  * be held.
 213                  */
 214                 porthash = in_pcbporthash_head(portinfo, lport);
 215                 GET_PORTHASH_TOKEN(porthash);
 216
 217                 if (so->so_cred->cr_uid != 0 &&
 218                     !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 219                         t = in6_pcblookup_local(porthash,
 220                             &sin6->sin6_addr, lport, INPLOOKUP_WILDCARD, cred);
 221                         if (t &&
 222                             (so->so_cred->cr_uid !=
 223                              t->inp_socket->so_cred->cr_uid)) {
 224                                 inp->in6p_laddr = kin6addr_any;
 225                                 error = EADDRINUSE;
 226                                 goto done;
 227                         }
 228                 }
 229                 if (cred && cred->cr_prison &&
 230                     !prison_replace_wildcards(td, nam)) {
 231                         inp->in6p_laddr = kin6addr_any;
 232                         error = EADDRNOTAVAIL;
 233                         goto done;
 234                 }
 235                 t = in6_pcblookup_local(porthash, &sin6->sin6_addr, lport,
 236                     wild, cred);
 237                 if (t && (reuseport & t->inp_socket->so_options) == 0) {
 238                         inp->in6p_laddr = kin6addr_any;
 239                         error = EADDRINUSE;
 240                         goto done;
 241                 }
 242
 243                 inp->inp_lport = lport;
 244                 in_pcbinsporthash(porthash, inp);
 245                 error = 0;
 246 done:
 247                 REL_PORTHASH_TOKEN(porthash);
 248                 return (error);
 249         } else {
 250 auto_select:
 251                 jsin6.sin6_addr = inp->in6p_laddr;
 252                 jsin6.sin6_family = AF_INET6;
 253                 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
 254                         inp->in6p_laddr = kin6addr_any;
 255                         inp->inp_lport = 0;
 256                         return (EINVAL);
 257                 }
 258
 259                 return in6_pcbsetlport(&inp->in6p_laddr, inp, td);
 260         }
 261 }
 262
 263 /*
 264  *   Transform old in6_pcbconnect() into an inner subroutine for new
 265  *   in6_pcbconnect(): Do some validity-checking on the remote
 266  *   address (in mbuf 'nam') and then determine local host address
 267  *   (i.e., which interface) to use to access that remote host.
 268  *
 269  *   This preserves definition of in6_pcbconnect(), while supporting a
 270  *   slightly different version for T/TCP.  (This is more than
 271  *   a bit of a kludge, but cleaning up the internal interfaces would
 272  *   have forced minor changes in every protocol).
 273  */
 274
 275 int
 276 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 277              struct in6_addr **plocal_addr6, struct thread *td)
 278 {
 279         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 280         struct ifnet *ifp = NULL;
 281         int error = 0;
 282
 283         if (nam->sa_len != sizeof (*sin6))
 284                 return (EINVAL);
 285         if (sin6->sin6_family != AF_INET6)
 286                 return (EAFNOSUPPORT);
 287         if (sin6->sin6_port == 0)
 288                 return (EADDRNOTAVAIL);
 289
 290         /* KAME hack: embed scopeid */
 291         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 292                 return EINVAL;
 293
 294         if (in6_ifaddr) {
 295                 /*
 296                  * If the destination address is UNSPECIFIED addr,
 297                  * use the loopback addr, e.g ::1.
 298                  */
 299                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 300                         sin6->sin6_addr = kin6addr_loopback;
 301         }
 302         {
 303                 /*
 304                  * XXX: in6_selectsrc might replace the bound local address
 305                  * with the address specified by setsockopt(IPV6_PKTINFO).
 306                  * Is it the intended behavior?
 307                  */
 308                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 309                                               inp->in6p_moptions,
 310                                               &inp->in6p_route,
 311                                               &inp->in6p_laddr, &error, td);
 312                 if (*plocal_addr6 == NULL) {
 313                         if (error == 0)
 314                                 error = EADDRNOTAVAIL;
 315                         return (error);
 316                 }
 317                 /*
 318                  * Don't do pcblookup call here; return interface in
 319                  * plocal_addr6
 320                  * and exit to caller, that will do the lookup.
 321                  */
 322         }
 323
 324         if (inp->in6p_route.ro_rt)
 325                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 326
 327         return (0);
 328 }
 329
 330 /*
 331  * Outer subroutine:
 332  * Connect from a socket to a specified address.
 333  * Both address and port must be specified in argument sin.
 334  * If don't have a local address for this socket yet,
 335  * then pick one.
 336  */
 337 int
 338 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 339 {
 340         struct in6_addr *addr6;
 341         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 342         int error;
 343
 344         /* Reject v4-mapped address */
 345         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 346                 return EADDRNOTAVAIL;
 347
 348         /*
 349          * Call inner routine, to assign local interface address.
 350          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 351          */
 352         if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
 353                 return (error);
 354
 355         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
 356                                sin6->sin6_port,
 357                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 358                               ? addr6 : &inp->in6p_laddr,
 359                               inp->inp_lport, 0, NULL) != NULL) {
 360                 return (EADDRINUSE);
 361         }
 362         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 363                 if (inp->inp_lport == 0) {
 364                         error = in6_pcbbind(inp, NULL, td);
 365                         if (error)
 366                                 return (error);
 367                 }
 368                 inp->in6p_laddr = *addr6;
 369         }
 370         inp->in6p_faddr = sin6->sin6_addr;
 371         inp->inp_fport = sin6->sin6_port;
 372         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 373         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 374         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 375                 inp->in6p_flowinfo |=
 376                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
 377
 378         in_pcbinsconnhash(inp);
 379         return (0);
 380 }
 381
 382 void
 383 in6_pcbdisconnect(struct inpcb *inp)
 384 {
 385         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 386         inp->inp_fport = 0;
 387         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 388         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 389         in_pcbremconnhash(inp);
 390         if (inp->inp_socket->so_state & SS_NOFDREF)
 391                 in6_pcbdetach(inp);
 392 }
 393
 394 void
 395 in6_pcbdetach(struct inpcb *inp)
 396 {
 397         struct socket *so = inp->inp_socket;
 398         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 399
 400         inp->inp_gencnt = ++ipi->ipi_gencnt;
 401         in_pcbremlists(inp);
 402         so->so_pcb = NULL;
 403         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
 404         sofree(so);             /* remove pcb ref */
 405
 406         if (inp->in6p_options)
 407                 m_freem(inp->in6p_options);
 408         ip6_freepcbopts(inp->in6p_outputopts);
 409         ip6_freemoptions(inp->in6p_moptions);
 410         if (inp->in6p_route.ro_rt)
 411                 rtfree(inp->in6p_route.ro_rt);
 412         /* Check and free IPv4 related resources in case of mapped addr */
 413         if (inp->inp_options)
 414                 m_free(inp->inp_options);
 415         ip_freemoptions(inp->inp_moptions);
 416
 417         kfree(inp, M_PCB);
 418 }
 419
 420 /*
 421  * The socket may have an invalid PCB, i.e. NULL.  For example, a TCP
 422  * socket received RST.
 423  */
 424 static int
 425 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
 426 {
 427         struct inpcb *inp;
 428         struct sockaddr_in6 *sin6;
 429
 430         KASSERT(curthread->td_type == TD_TYPE_NETISR, ("not in netisr"));
 431         inp = so->so_pcb;
 432         if (!inp)
 433                 return EINVAL;
 434
 435         sin6 = kmalloc(sizeof *sin6, M_SONAME, M_WAITOK | M_ZERO);
 436         sin6->sin6_family = AF_INET6;
 437         sin6->sin6_len = sizeof(*sin6);
 438         sin6->sin6_port = inp->inp_lport;
 439         sin6->sin6_addr = inp->in6p_laddr;
 440         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 441                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 442         else
 443                 sin6->sin6_scope_id = 0;        /*XXX*/
 444         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 445                 sin6->sin6_addr.s6_addr16[1] = 0;
 446
 447         *nam = (struct sockaddr *)sin6;
 448         return 0;
 449 }
 450
 451 void
 452 in6_setsockaddr_dispatch(netmsg_t msg)
 453 {
 454         int error;
 455
 456         error = in6_setsockaddr(msg->sockaddr.base.nm_so, msg->sockaddr.nm_nam);
 457         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
 458 }
 459
 460 void
 461 in6_setpeeraddr_dispatch(netmsg_t msg)
 462 {
 463         int error;
 464
 465         error = in6_setpeeraddr(msg->peeraddr.base.nm_so, msg->peeraddr.nm_nam);
 466         lwkt_replymsg(&msg->peeraddr.base.lmsg, error);
 467 }
 468
 469 /*
 470  * The socket may have an invalid PCB, i.e. NULL.  For example, a TCP
 471  * socket received RST.
 472  */
 473 int
 474 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
 475 {
 476         struct inpcb *inp;
 477         struct sockaddr_in6 *sin6;
 478
 479         KASSERT(curthread->td_type == TD_TYPE_NETISR, ("not in netisr"));
 480         inp = so->so_pcb;
 481         if (!inp)
 482                 return EINVAL;
 483
 484         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
 485         sin6->sin6_family = AF_INET6;
 486         sin6->sin6_len = sizeof(struct sockaddr_in6);
 487         sin6->sin6_port = inp->inp_fport;
 488         sin6->sin6_addr = inp->in6p_faddr;
 489         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 490                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 491         else
 492                 sin6->sin6_scope_id = 0;        /*XXX*/
 493         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 494                 sin6->sin6_addr.s6_addr16[1] = 0;
 495
 496         *nam = (struct sockaddr *)sin6;
 497         return 0;
 498 }
 499
 500 /*
 501  * Pass some notification to all connections of a protocol
 502  * associated with address dst.  The local address and/or port numbers
 503  * may be specified to limit the search.  The "usual action" will be
 504  * taken, depending on the ctlinput cmd.  The caller must filter any
 505  * cmds that are uninteresting (e.g., no error in the map).
 506  * Call the protocol specific routine (if any) to report
 507  * any errors for each matching socket.
 508  */
 509 void
 510 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, in_port_t fport,
 511     const struct sockaddr *src, in_port_t lport, int cmd, int arg,
 512     inp_notify_t notify)
 513 {
 514         struct inpcb *inp, *marker;
 515         struct sockaddr_in6 sa6_src, *sa6_dst;
 516         u_int32_t flowinfo;
 517
 518         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 519                 return;
 520
 521         sa6_dst = (struct sockaddr_in6 *)dst;
 522         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 523                 return;
 524
 525         /*
 526          * note that src can be NULL when we get notify by local fragmentation.
 527          */
 528         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 529         flowinfo = sa6_src.sin6_flowinfo;
 530
 531         /*
 532          * Redirects go to all references to the destination,
 533          * and use in6_rtchange to invalidate the route cache.
 534          * Dead host indications: also use in6_rtchange to invalidate
 535          * the cache, and deliver the error to all the sockets.
 536          * Otherwise, if we have knowledge of the local port and address,
 537          * deliver only to that socket.
 538          */
 539         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 540                 fport = 0;
 541                 lport = 0;
 542                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 543
 544                 if (cmd != PRC_HOSTDEAD)
 545                         notify = in6_rtchange;
 546         }
 547         if (cmd != PRC_MSGSIZE)
 548                 arg = inet6ctlerrmap[cmd];
 549
 550         marker = in_pcbmarker();
 551
 552         GET_PCBINFO_TOKEN(pcbinfo);
 553
 554         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
 555         while ((inp = LIST_NEXT(marker, inp_list)) != NULL) {
 556                 LIST_REMOVE(marker, inp_list);
 557                 LIST_INSERT_AFTER(inp, marker, inp_list);
 558
 559                 if (inp->inp_flags & INP_PLACEMARKER)
 560                         continue;
 561
 562                 if (!INP_ISIPV6(inp))
 563                         continue;
 564                 /*
 565                  * If the error designates a new path MTU for a destination
 566                  * and the application (associated with this socket) wanted to
 567                  * know the value, notify. Note that we notify for all
 568                  * disconnected sockets if the corresponding application
 569                  * wanted. This is because some UDP applications keep sending
 570                  * sockets disconnected.
 571                  * XXX: should we avoid to notify the value to TCP sockets?
 572                  */
 573                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 574                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 575                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 576                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg);
 577                 }
 578
 579                 /*
 580                  * Detect if we should notify the error. If no source and
 581                  * destination ports are specifed, but non-zero flowinfo and
 582                  * local address match, notify the error. This is the case
 583                  * when the error is delivered with an encrypted buffer
 584                  * by ESP. Otherwise, just compare addresses and ports
 585                  * as usual.
 586                  */
 587                 if (lport == 0 && fport == 0 && flowinfo &&
 588                     inp->inp_socket != NULL &&
 589                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 590                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 591                         goto do_notify;
 592                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 593                                              &sa6_dst->sin6_addr) ||
 594                          inp->inp_socket == 0 ||
 595                          (lport && inp->inp_lport != lport) ||
 596                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 597                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 598                                               &sa6_src.sin6_addr)) ||
 599                          (fport && inp->inp_fport != fport))
 600                         continue;
 601
 602 do_notify:
 603                 if (notify)
 604                         (*notify)(inp, arg);
 605         }
 606         LIST_REMOVE(marker, inp_list);
 607
 608         REL_PCBINFO_TOKEN(pcbinfo);
 609 }
 610
 611 /*
 612  * Lookup a PCB based on the local address and port.
 613  */
 614 struct inpcb *
 615 in6_pcblookup_local(struct inpcbporthead *porthash,
 616     const struct in6_addr *laddr, u_int lport_arg, int wild_okay,
 617     struct ucred *cred)
 618 {
 619         struct inpcb *inp;
 620         int matchwild = 3, wildcard;
 621         u_short lport = lport_arg;
 622         struct inpcbport *phd;
 623         struct inpcb *match = NULL;
 624
 625         /*
 626          * If the porthashbase is shared across several cpus, it must
 627          * have been locked.
 628          */
 629         ASSERT_PORTHASH_TOKEN_HELD(porthash);
 630
 631         /*
 632          * Best fit PCB lookup.
 633          *
 634          * First see if this local port is in use by looking on the
 635          * port hash list.
 636          */
 637         LIST_FOREACH(phd, porthash, phd_hash) {
 638                 if (phd->phd_port == lport)
 639                         break;
 640         }
 641
 642         if (phd != NULL) {
 643                 /*
 644                  * Port is in use by one or more PCBs. Look for best
 645                  * fit.
 646                  */
 647                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 648                         wildcard = 0;
 649                         if (!INP_ISIPV6(inp))
 650                                 continue;
 651                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 652                                 wildcard++;
 653                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 654                                 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 655                                         wildcard++;
 656                                 else if (!IN6_ARE_ADDR_EQUAL(
 657                                         &inp->in6p_laddr, laddr))
 658                                         continue;
 659                         } else {
 660                                 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 661                                         wildcard++;
 662                         }
 663                         if (wildcard && !wild_okay)
 664                                 continue;
 665                         if (wildcard < matchwild &&
 666                             (cred == NULL ||
 667                              cred->cr_prison ==
 668                                         inp->inp_socket->so_cred->cr_prison)) {
 669                                 match = inp;
 670                                 matchwild = wildcard;
 671                                 if (wildcard == 0)
 672                                         break;
 673                                 else
 674                                         matchwild = wildcard;
 675                         }
 676                 }
 677         }
 678         return (match);
 679 }
 680
 681 void
 682 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 683 {
 684         struct in6pcb *in6p, *marker;
 685         struct ip6_moptions *im6o;
 686         struct in6_multi_mship *imm, *nimm;
 687
 688         /*
 689          * We only need to make sure that we are in netisr0, where all
 690          * multicast operation happen.  We could check inpcbinfo which
 691          * does not belong to netisr0 by holding the inpcbinfo's token.
 692          * In this case, the pcbinfo must be able to be shared, i.e.
 693          * pcbinfo->infotoken is not NULL.
 694          */
 695         ASSERT_NETISR0;
 696         KASSERT(pcbinfo->cpu == 0 || pcbinfo->infotoken != NULL,
 697             ("pcbinfo could not be shared"));
 698
 699         /*
 700          * Get a marker for the current netisr (netisr0).
 701          *
 702          * It is possible that the multicast address deletion blocks,
 703          * which could cause temporary token releasing.  So we use
 704          * inpcb marker here to get a coherent view of the inpcb list.
 705          *
 706          * While, on the other hand, moptions are only added and deleted
 707          * in netisr0, so we would not see staled moption or miss moption
 708          * even if the token was released due to the blocking multicast
 709          * address deletion.
 710          */
 711         marker = in_pcbmarker();
 712
 713         GET_PCBINFO_TOKEN(pcbinfo);
 714
 715         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
 716         while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
 717                 LIST_REMOVE(marker, inp_list);
 718                 LIST_INSERT_AFTER(in6p, marker, inp_list);
 719
 720                 if (in6p->in6p_flags & INP_PLACEMARKER)
 721                         continue;
 722                 im6o = in6p->in6p_moptions;
 723                 if (INP_ISIPV6(in6p) && im6o) {
 724                         /*
 725                          * Unselect the outgoing interface if it is being
 726                          * detached.
 727                          */
 728                         if (im6o->im6o_multicast_ifp == ifp)
 729                                 im6o->im6o_multicast_ifp = NULL;
 730
 731                         /*
 732                          * Drop multicast group membership if we joined
 733                          * through the interface being detached.
 734                          * XXX controversial - is it really legal for kernel
 735                          * to force this?
 736                          */
 737                         for (imm = im6o->im6o_memberships.lh_first;
 738                              imm != NULL; imm = nimm) {
 739                                 nimm = imm->i6mm_chain.le_next;
 740                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 741                                         LIST_REMOVE(imm, i6mm_chain);
 742                                         in6_delmulti(imm->i6mm_maddr);
 743                                         kfree(imm, M_IPMADDR);
 744                                 }
 745                         }
 746                 }
 747         }
 748         LIST_REMOVE(marker, inp_list);
 749
 750         REL_PCBINFO_TOKEN(pcbinfo);
 751 }
 752
 753 /*
 754  * Check for alternatives when higher level complains
 755  * about service problems.  For now, invalidate cached
 756  * routing information.  If the route was created dynamically
 757  * (by a redirect), time to try a default gateway again.
 758  */
 759 void
 760 in6_losing(struct inpcb *in6p)
 761 {
 762         struct rtentry *rt;
 763         struct rt_addrinfo info;
 764
 765         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
 766                 bzero((caddr_t)&info, sizeof(info));
 767                 info.rti_flags = rt->rt_flags;
 768                 info.rti_info[RTAX_DST] = rt_key(rt);
 769                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 770                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 771                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
 772                 if (rt->rt_flags & RTF_DYNAMIC) {
 773                         rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
 774                             rt_mask(rt), rt->rt_flags, NULL);
 775                 }
 776                 in6p->in6p_route.ro_rt = NULL;
 777                 rtfree(rt);
 778                 /*
 779                  * A new route can be allocated
 780                  * the next time output is attempted.
 781                  */
 782         }
 783 }
 784
 785 /*
 786  * After a routing change, flush old routing
 787  * and allocate a (hopefully) better one.
 788  */
 789 void
 790 in6_rtchange(struct inpcb *inp, int error)
 791 {
 792         if (inp->in6p_route.ro_rt) {
 793                 rtfree(inp->in6p_route.ro_rt);
 794                 inp->in6p_route.ro_rt = 0;
 795                 /*
 796                  * A new route can be allocated the next time
 797                  * output is attempted.
 798                  */
 799         }
 800 }
 801
 802 /*
 803  * Lookup PCB in hash list.
 804  */
 805 struct inpcb *
 806 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
 807                    u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
 808                    int wildcard, struct ifnet *ifp)
 809 {
 810         struct inpcbhead *head;
 811         struct inpcb *inp;
 812         struct inpcb *jinp = NULL;
 813         u_short fport = fport_arg, lport = lport_arg;
 814
 815         /*
 816          * First look for an exact match.
 817          */
 818         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
 819                                               fport,
 820                                               laddr->s6_addr32[3], /* XXX JH */
 821                                               lport,
 822                                               pcbinfo->hashmask)];
 823         LIST_FOREACH(inp, head, inp_hash) {
 824                 if (!INP_ISIPV6(inp))
 825                         continue;
 826                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 827                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 828                     inp->inp_fport == fport &&
 829                     inp->inp_lport == lport) {
 830                         /*
 831                          * Found.
 832                          */
 833                         if (inp->inp_socket == NULL ||
 834                         inp->inp_socket->so_cred->cr_prison == NULL) {
 835                                 return (inp);
 836                         } else {
 837                                 if  (jinp == NULL)
 838                                         jinp = inp;
 839                         }
 840                 }
 841         }
 842         if (jinp != NULL)
 843                 return(jinp);
 844
 845         if (wildcard) {
 846                 struct inpcontainerhead *chead;
 847                 struct inpcontainer *ic;
 848                 struct inpcb *local_wild = NULL;
 849                 struct inpcb *jinp_wild = NULL;
 850                 struct sockaddr_in6 jsin6;
 851                 struct ucred *cred;
 852
 853                 /*
 854                  * Order of socket selection:
 855                  * 1. non-jailed, non-wild.
 856                  * 2. non-jailed, wild.
 857                  * 3. jailed, non-wild.
 858                  * 4. jailed, wild.
 859                  */
 860                 jsin6.sin6_family = AF_INET6;
 861                 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
 862                     pcbinfo->wildcardhashmask)];
 863
 864                 GET_PCBINFO_TOKEN(pcbinfo);
 865                 LIST_FOREACH(ic, chead, ic_list) {
 866                         inp = ic->ic_inp;
 867                         if (inp->inp_flags & INP_PLACEMARKER)
 868                                 continue;
 869
 870                         if (!INP_ISIPV6(inp))
 871                                 continue;
 872                         if (inp->inp_socket != NULL)
 873                                 cred = inp->inp_socket->so_cred;
 874                         else
 875                                 cred = NULL;
 876
 877                         if (cred != NULL && jailed(cred)) {
 878                                 if (jinp != NULL) {
 879                                         continue;
 880                                 } else {
 881                                         jsin6.sin6_addr = *laddr;
 882                                         if (!jailed_ip(cred->cr_prison,
 883                                             (struct sockaddr *)&jsin6))
 884                                                 continue;
 885                                 }
 886                         }
 887                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 888                             inp->inp_lport == lport) {
 889                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 890                                                        laddr)) {
 891                                         if (cred != NULL && jailed(cred)) {
 892                                                 jinp = inp;
 893                                         } else {
 894                                                 REL_PCBINFO_TOKEN(pcbinfo);
 895                                                 return (inp);
 896                                         }
 897                                 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 898                                         if (cred != NULL && jailed(cred))
 899                                                 jinp_wild = inp;
 900                                         else
 901                                                 local_wild = inp;
 902                                 }
 903                         }
 904                 }
 905                 REL_PCBINFO_TOKEN(pcbinfo);
 906
 907                 if (local_wild != NULL)
 908                         return (local_wild);
 909                 if (jinp != NULL)
 910                         return (jinp);
 911                 return (jinp_wild);
 912         }
 913
 914         /*
 915          * Not found.
 916          */
 917         return (NULL);
 918 }
 919
 920 void
 921 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
 922 {
 923         struct ip6_hdr *ip;
 924
 925         ip = mtod(m, struct ip6_hdr *);
 926         bzero(sin6, sizeof(*sin6));
 927         sin6->sin6_len = sizeof(*sin6);
 928         sin6->sin6_family = AF_INET6;
 929         sin6->sin6_addr = ip->ip6_src;
 930         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 931                 sin6->sin6_addr.s6_addr16[1] = 0;
 932         sin6->sin6_scope_id =
 933                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 934                 ? m->m_pkthdr.rcvif->if_index : 0;
 935
 936         return;
 937 }
 938
 939 void
 940 in6_savefaddr(struct socket *so, const struct sockaddr *faddr)
 941 {
 942         struct sockaddr_in6 *sin6;
 943
 944         KASSERT(faddr->sa_family == AF_INET6,
 945             ("not AF_INET6 faddr %d", faddr->sa_family));
 946
 947         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
 948         sin6->sin6_family = AF_INET6;
 949         sin6->sin6_len = sizeof(*sin6);
 950
 951         sin6->sin6_port = ((const struct sockaddr_in6 *)faddr)->sin6_port;
 952         sin6->sin6_addr = ((const struct sockaddr_in6 *)faddr)->sin6_addr;
 953
 954         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 955                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 956         else
 957                 sin6->sin6_scope_id = 0;        /*XXX*/
 958         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 959                 sin6->sin6_addr.s6_addr16[1] = 0;
 960
 961         so->so_faddr = (struct sockaddr *)sin6;
 962 }