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 #include "opt_ipsec.h"
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/malloc.h>
  72 #include <sys/mbuf.h>
  73 #include <sys/domain.h>
  74 #include <sys/protosw.h>
  75 #include <sys/socket.h>
  76 #include <sys/socketvar.h>
  77 #include <sys/sockio.h>
  78 #include <sys/errno.h>
  79 #include <sys/time.h>
  80 #include <sys/proc.h>
  81 #include <sys/priv.h>
  82 #include <sys/jail.h>
  83
  84 #include <sys/thread2.h>
  85 #include <sys/msgport2.h>
  86
  87 #include <vm/vm_zone.h>
  88
  89 #include <net/if.h>
  90 #include <net/if_types.h>
  91 #include <net/route.h>
  92 #include <net/netisr2.h>
  93
  94 #include <netinet/in.h>
  95 #include <netinet/in_var.h>
  96 #include <netinet/in_systm.h>
  97 #include <netinet/ip6.h>
  98 #include <netinet/ip_var.h>
  99 #include <netinet6/ip6_var.h>
 100 #include <netinet6/nd6.h>
 101 #include <netinet/in_pcb.h>
 102 #include <netinet6/in6_pcb.h>
 103
 104 #ifdef IPSEC
 105 #include <netinet6/ipsec.h>
 106 #ifdef INET6
 107 #include <netinet6/ipsec6.h>
 108 #endif
 109 #include <netinet6/ah.h>
 110 #ifdef INET6
 111 #include <netinet6/ah6.h>
 112 #endif
 113 #include <netproto/key/key.h>
 114 #endif /* IPSEC */
 115
 116 #ifdef FAST_IPSEC
 117 #include <netproto/ipsec/ipsec.h>
 118 #include <netproto/ipsec/ipsec6.h>
 119 #include <netproto/ipsec/key.h>
 120 #define IPSEC
 121 #endif /* FAST_IPSEC */
 122
 123 struct  in6_addr zeroin6_addr;
 124
 125 int
 126 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 127 {
 128         struct socket *so = inp->inp_socket;
 129         struct sockaddr_in6 jsin6;
 130         int error;
 131
 132         if (!in6_ifaddr) /* XXX broken! */
 133                 return (EADDRNOTAVAIL);
 134         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 135                 return (EINVAL);
 136
 137         if (nam) {
 138                 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 139                 struct inpcbinfo *pcbinfo;
 140                 struct inpcbportinfo *portinfo;
 141                 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 142                 struct ucred *cred = NULL;
 143                 struct inpcb *t;
 144                 u_short lport, lport_ho;
 145
 146                 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 147                         wild = 1;
 148                 if (td->td_proc != NULL)
 149                         cred = td->td_proc->p_ucred;
 150
 151                 if (nam->sa_len != sizeof(*sin6))
 152                         return (EINVAL);
 153                 /*
 154                  * family check.
 155                  */
 156                 if (nam->sa_family != AF_INET6)
 157                         return (EAFNOSUPPORT);
 158
 159                 /* Reject v4-mapped address */
 160                 if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 161                         return (EADDRNOTAVAIL);
 162
 163                 if (!prison_replace_wildcards(td, nam))
 164                         return (EINVAL);
 165
 166                 /* KAME hack: embed scopeid */
 167                 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
 168                         return (EINVAL);
 169                 /* this must be cleared for ifa_ifwithaddr() */
 170                 sin6->sin6_scope_id = 0;
 171
 172                 lport = sin6->sin6_port;
 173                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 174                         /*
 175                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 176                          * allow compepte duplication of binding if
 177                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 178                          * and a multicast address is bound on both
 179                          * new and duplicated sockets.
 180                          */
 181                         if (so->so_options & SO_REUSEADDR)
 182                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 183                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 184                         struct ifaddr *ia = NULL;
 185
 186                         sin6->sin6_port = 0;            /* yech... */
 187                         if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
 188                                 sin6->sin6_addr = kin6addr_any;
 189                                 return (EINVAL);
 190                         }
 191                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL)
 192                                 return (EADDRNOTAVAIL);
 193
 194                         /*
 195                          * XXX: bind to an anycast address might accidentally
 196                          * cause sending a packet with anycast source address.
 197                          * We should allow to bind to a deprecated address, since
 198                          * the application dares to use it.
 199                          */
 200                         if (ia &&
 201                             ((struct in6_ifaddr *)ia)->ia6_flags &
 202                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED))
 203                                 return (EADDRNOTAVAIL);
 204                 }
 205
 206                 inp->in6p_laddr = sin6->sin6_addr;
 207
 208                 if (lport == 0)
 209                         goto auto_select;
 210                 lport_ho = ntohs(lport);
 211
 212                 /* GROSS */
 213                 if (lport_ho < IPV6PORT_RESERVED && cred &&
 214                     priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0)) {
 215                         inp->in6p_laddr = kin6addr_any;
 216                         return (EACCES);
 217                 }
 218
 219                 /*
 220                  * Locate the proper portinfo based on lport
 221                  */
 222                 pcbinfo = inp->inp_pcbinfo;
 223                 portinfo =
 224                     &pcbinfo->portinfo[lport_ho & pcbinfo->portinfo_mask];
 225                 KKASSERT((lport_ho & pcbinfo->portinfo_mask) ==
 226                     portinfo->offset);
 227
 228                 /*
 229                  * This has to be atomic.  If the porthash is shared across
 230                  * multiple protocol threads (aka tcp) then the token must
 231                  * be held.
 232                  */
 233                 GET_PORT_TOKEN(portinfo);
 234
 235                 if (so->so_cred->cr_uid != 0 &&
 236                     !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 237                         t = in6_pcblookup_local(portinfo,
 238                             &sin6->sin6_addr, lport, INPLOOKUP_WILDCARD, cred);
 239                         if (t &&
 240                             (so->so_cred->cr_uid !=
 241                              t->inp_socket->so_cred->cr_uid)) {
 242                                 inp->in6p_laddr = kin6addr_any;
 243                                 error = EADDRINUSE;
 244                                 goto done;
 245                         }
 246                 }
 247                 if (cred && cred->cr_prison &&
 248                     !prison_replace_wildcards(td, nam)) {
 249                         inp->in6p_laddr = kin6addr_any;
 250                         error = EADDRNOTAVAIL;
 251                         goto done;
 252                 }
 253                 t = in6_pcblookup_local(portinfo, &sin6->sin6_addr, lport,
 254                     wild, cred);
 255                 if (t && (reuseport & t->inp_socket->so_options) == 0) {
 256                         inp->in6p_laddr = kin6addr_any;
 257                         error = EADDRINUSE;
 258                         goto done;
 259                 }
 260
 261                 inp->inp_lport = lport;
 262                 in_pcbinsporthash(portinfo, inp);
 263                 error = 0;
 264 done:
 265                 REL_PORT_TOKEN(portinfo);
 266                 return (error);
 267         } else {
 268 auto_select:
 269                 jsin6.sin6_addr = inp->in6p_laddr;
 270                 jsin6.sin6_family = AF_INET6;
 271                 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
 272                         inp->in6p_laddr = kin6addr_any;
 273                         inp->inp_lport = 0;
 274                         return (EINVAL);
 275                 }
 276
 277                 return in6_pcbsetlport(&inp->in6p_laddr, inp, td);
 278         }
 279 }
 280
 281 /*
 282  *   Transform old in6_pcbconnect() into an inner subroutine for new
 283  *   in6_pcbconnect(): Do some validity-checking on the remote
 284  *   address (in mbuf 'nam') and then determine local host address
 285  *   (i.e., which interface) to use to access that remote host.
 286  *
 287  *   This preserves definition of in6_pcbconnect(), while supporting a
 288  *   slightly different version for T/TCP.  (This is more than
 289  *   a bit of a kludge, but cleaning up the internal interfaces would
 290  *   have forced minor changes in every protocol).
 291  */
 292
 293 int
 294 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 295              struct in6_addr **plocal_addr6, struct thread *td)
 296 {
 297         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 298         struct ifnet *ifp = NULL;
 299         int error = 0;
 300
 301         if (nam->sa_len != sizeof (*sin6))
 302                 return (EINVAL);
 303         if (sin6->sin6_family != AF_INET6)
 304                 return (EAFNOSUPPORT);
 305         if (sin6->sin6_port == 0)
 306                 return (EADDRNOTAVAIL);
 307
 308         /* KAME hack: embed scopeid */
 309         if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
 310                 return EINVAL;
 311
 312         if (in6_ifaddr) {
 313                 /*
 314                  * If the destination address is UNSPECIFIED addr,
 315                  * use the loopback addr, e.g ::1.
 316                  */
 317                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 318                         sin6->sin6_addr = kin6addr_loopback;
 319         }
 320         {
 321                 /*
 322                  * XXX: in6_selectsrc might replace the bound local address
 323                  * with the address specified by setsockopt(IPV6_PKTINFO).
 324                  * Is it the intended behavior?
 325                  */
 326                 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 327                                               inp->in6p_moptions,
 328                                               &inp->in6p_route,
 329                                               &inp->in6p_laddr, &error, td);
 330                 if (*plocal_addr6 == NULL) {
 331                         if (error == 0)
 332                                 error = EADDRNOTAVAIL;
 333                         return (error);
 334                 }
 335                 /*
 336                  * Don't do pcblookup call here; return interface in
 337                  * plocal_addr6
 338                  * and exit to caller, that will do the lookup.
 339                  */
 340         }
 341
 342         if (inp->in6p_route.ro_rt)
 343                 ifp = inp->in6p_route.ro_rt->rt_ifp;
 344
 345         return (0);
 346 }
 347
 348 /*
 349  * Outer subroutine:
 350  * Connect from a socket to a specified address.
 351  * Both address and port must be specified in argument sin.
 352  * If don't have a local address for this socket yet,
 353  * then pick one.
 354  */
 355 int
 356 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
 357 {
 358         struct in6_addr *addr6;
 359         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 360         int error;
 361
 362         /* Reject v4-mapped address */
 363         if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
 364                 return EADDRNOTAVAIL;
 365
 366         /*
 367          * Call inner routine, to assign local interface address.
 368          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 369          */
 370         if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
 371                 return (error);
 372
 373         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
 374                                sin6->sin6_port,
 375                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 376                               ? addr6 : &inp->in6p_laddr,
 377                               inp->inp_lport, 0, NULL) != NULL) {
 378                 return (EADDRINUSE);
 379         }
 380         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 381                 if (inp->inp_lport == 0) {
 382                         error = in6_pcbbind(inp, NULL, td);
 383                         if (error)
 384                                 return (error);
 385                 }
 386                 inp->in6p_laddr = *addr6;
 387         }
 388         inp->in6p_faddr = sin6->sin6_addr;
 389         inp->inp_fport = sin6->sin6_port;
 390         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 391         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 392         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 393                 inp->in6p_flowinfo |=
 394                     (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
 395
 396         in_pcbinsconnhash(inp);
 397         return (0);
 398 }
 399
 400 void
 401 in6_pcbdisconnect(struct inpcb *inp)
 402 {
 403         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 404         inp->inp_fport = 0;
 405         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 406         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 407         in_pcbremconnhash(inp);
 408         if (inp->inp_socket->so_state & SS_NOFDREF)
 409                 in6_pcbdetach(inp);
 410 }
 411
 412 void
 413 in6_pcbdetach(struct inpcb *inp)
 414 {
 415         struct socket *so = inp->inp_socket;
 416         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 417
 418 #ifdef IPSEC
 419         if (inp->in6p_sp != NULL)
 420                 ipsec6_delete_pcbpolicy(inp);
 421 #endif /* IPSEC */
 422         inp->inp_gencnt = ++ipi->ipi_gencnt;
 423         in_pcbremlists(inp);
 424         so->so_pcb = NULL;
 425         KKASSERT((so->so_state & SS_ASSERTINPROG) == 0);
 426         sofree(so);             /* remove pcb ref */
 427
 428         if (inp->in6p_options)
 429                 m_freem(inp->in6p_options);
 430         ip6_freepcbopts(inp->in6p_outputopts);
 431         ip6_freemoptions(inp->in6p_moptions);
 432         if (inp->in6p_route.ro_rt)
 433                 rtfree(inp->in6p_route.ro_rt);
 434         /* Check and free IPv4 related resources in case of mapped addr */
 435         if (inp->inp_options)
 436                 m_free(inp->inp_options);
 437         ip_freemoptions(inp->inp_moptions);
 438
 439         kfree(inp, M_PCB);
 440 }
 441
 442 /*
 443  * The socket may have an invalid PCB, i.e. NULL.  For example, a TCP
 444  * socket received RST.
 445  */
 446 static int
 447 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
 448 {
 449         struct inpcb *inp;
 450         struct sockaddr_in6 *sin6;
 451
 452         KASSERT(curthread->td_type == TD_TYPE_NETISR, ("not in netisr"));
 453         inp = so->so_pcb;
 454         if (!inp)
 455                 return EINVAL;
 456
 457         sin6 = kmalloc(sizeof *sin6, M_SONAME, M_WAITOK | M_ZERO);
 458         sin6->sin6_family = AF_INET6;
 459         sin6->sin6_len = sizeof(*sin6);
 460         sin6->sin6_port = inp->inp_lport;
 461         sin6->sin6_addr = inp->in6p_laddr;
 462         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 463                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 464         else
 465                 sin6->sin6_scope_id = 0;        /*XXX*/
 466         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 467                 sin6->sin6_addr.s6_addr16[1] = 0;
 468
 469         *nam = (struct sockaddr *)sin6;
 470         return 0;
 471 }
 472
 473 void
 474 in6_setsockaddr_dispatch(netmsg_t msg)
 475 {
 476         int error;
 477
 478         error = in6_setsockaddr(msg->sockaddr.base.nm_so, msg->sockaddr.nm_nam);
 479         lwkt_replymsg(&msg->sockaddr.base.lmsg, error);
 480 }
 481
 482 void
 483 in6_setpeeraddr_dispatch(netmsg_t msg)
 484 {
 485         int error;
 486
 487         error = in6_setpeeraddr(msg->peeraddr.base.nm_so, msg->peeraddr.nm_nam);
 488         lwkt_replymsg(&msg->peeraddr.base.lmsg, error);
 489 }
 490
 491 /*
 492  * The socket may have an invalid PCB, i.e. NULL.  For example, a TCP
 493  * socket received RST.
 494  */
 495 int
 496 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
 497 {
 498         struct inpcb *inp;
 499         struct sockaddr_in6 *sin6;
 500
 501         KASSERT(curthread->td_type == TD_TYPE_NETISR, ("not in netisr"));
 502         inp = so->so_pcb;
 503         if (!inp)
 504                 return EINVAL;
 505
 506         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
 507         sin6->sin6_family = AF_INET6;
 508         sin6->sin6_len = sizeof(struct sockaddr_in6);
 509         sin6->sin6_port = inp->inp_fport;
 510         sin6->sin6_addr = inp->in6p_faddr;
 511         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 512                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 513         else
 514                 sin6->sin6_scope_id = 0;        /*XXX*/
 515         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 516                 sin6->sin6_addr.s6_addr16[1] = 0;
 517
 518         *nam = (struct sockaddr *)sin6;
 519         return 0;
 520 }
 521
 522 /*
 523  * Pass some notification to all connections of a protocol
 524  * associated with address dst.  The local address and/or port numbers
 525  * may be specified to limit the search.  The "usual action" will be
 526  * taken, depending on the ctlinput cmd.  The caller must filter any
 527  * cmds that are uninteresting (e.g., no error in the map).
 528  * Call the protocol specific routine (if any) to report
 529  * any errors for each matching socket.
 530  */
 531 void
 532 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, in_port_t fport,
 533     const struct sockaddr *src, in_port_t lport, int cmd, int arg,
 534     inp_notify_t notify)
 535 {
 536         struct inpcb *inp, *marker;
 537         struct sockaddr_in6 sa6_src, *sa6_dst;
 538         u_int32_t flowinfo;
 539
 540         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 541                 return;
 542
 543         sa6_dst = (struct sockaddr_in6 *)dst;
 544         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 545                 return;
 546
 547         /*
 548          * note that src can be NULL when we get notify by local fragmentation.
 549          */
 550         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 551         flowinfo = sa6_src.sin6_flowinfo;
 552
 553         /*
 554          * Redirects go to all references to the destination,
 555          * and use in6_rtchange to invalidate the route cache.
 556          * Dead host indications: also use in6_rtchange to invalidate
 557          * the cache, and deliver the error to all the sockets.
 558          * Otherwise, if we have knowledge of the local port and address,
 559          * deliver only to that socket.
 560          */
 561         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 562                 fport = 0;
 563                 lport = 0;
 564                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 565
 566                 if (cmd != PRC_HOSTDEAD)
 567                         notify = in6_rtchange;
 568         }
 569         if (cmd != PRC_MSGSIZE)
 570                 arg = inet6ctlerrmap[cmd];
 571
 572         marker = in_pcbmarker(mycpuid);
 573
 574         GET_PCBINFO_TOKEN(pcbinfo);
 575
 576         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
 577         while ((inp = LIST_NEXT(marker, inp_list)) != NULL) {
 578                 LIST_REMOVE(marker, inp_list);
 579                 LIST_INSERT_AFTER(inp, marker, inp_list);
 580
 581                 if (inp->inp_flags & INP_PLACEMARKER)
 582                         continue;
 583
 584                 if (!INP_ISIPV6(inp))
 585                         continue;
 586                 /*
 587                  * If the error designates a new path MTU for a destination
 588                  * and the application (associated with this socket) wanted to
 589                  * know the value, notify. Note that we notify for all
 590                  * disconnected sockets if the corresponding application
 591                  * wanted. This is because some UDP applications keep sending
 592                  * sockets disconnected.
 593                  * XXX: should we avoid to notify the value to TCP sockets?
 594                  */
 595                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 596                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 597                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 598                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg);
 599                 }
 600
 601                 /*
 602                  * Detect if we should notify the error. If no source and
 603                  * destination ports are specifed, but non-zero flowinfo and
 604                  * local address match, notify the error. This is the case
 605                  * when the error is delivered with an encrypted buffer
 606                  * by ESP. Otherwise, just compare addresses and ports
 607                  * as usual.
 608                  */
 609                 if (lport == 0 && fport == 0 && flowinfo &&
 610                     inp->inp_socket != NULL &&
 611                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 612                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 613                         goto do_notify;
 614                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 615                                              &sa6_dst->sin6_addr) ||
 616                          inp->inp_socket == 0 ||
 617                          (lport && inp->inp_lport != lport) ||
 618                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 619                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 620                                               &sa6_src.sin6_addr)) ||
 621                          (fport && inp->inp_fport != fport))
 622                         continue;
 623
 624 do_notify:
 625                 if (notify)
 626                         (*notify)(inp, arg);
 627         }
 628         LIST_REMOVE(marker, inp_list);
 629
 630         REL_PCBINFO_TOKEN(pcbinfo);
 631 }
 632
 633 /*
 634  * Lookup a PCB based on the local address and port.
 635  */
 636 struct inpcb *
 637 in6_pcblookup_local(struct inpcbportinfo *portinfo,
 638     const struct in6_addr *laddr, u_int lport_arg, int wild_okay,
 639     struct ucred *cred)
 640 {
 641         struct inpcb *inp;
 642         int matchwild = 3, wildcard;
 643         u_short lport = lport_arg;
 644         struct inpcbporthead *porthash;
 645         struct inpcbport *phd;
 646         struct inpcb *match = NULL;
 647
 648         /*
 649          * If the porthashbase is shared across several cpus, it must
 650          * have been locked.
 651          */
 652         ASSERT_PORT_TOKEN_HELD(portinfo);
 653
 654         /*
 655          * Best fit PCB lookup.
 656          *
 657          * First see if this local port is in use by looking on the
 658          * port hash list.
 659          */
 660         porthash = &portinfo->porthashbase[
 661                                 INP_PCBPORTHASH(lport, portinfo->porthashmask)];
 662         LIST_FOREACH(phd, porthash, phd_hash) {
 663                 if (phd->phd_port == lport)
 664                         break;
 665         }
 666
 667         if (phd != NULL) {
 668                 /*
 669                  * Port is in use by one or more PCBs. Look for best
 670                  * fit.
 671                  */
 672                 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 673                         wildcard = 0;
 674                         if (!INP_ISIPV6(inp))
 675                                 continue;
 676                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 677                                 wildcard++;
 678                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 679                                 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 680                                         wildcard++;
 681                                 else if (!IN6_ARE_ADDR_EQUAL(
 682                                         &inp->in6p_laddr, laddr))
 683                                         continue;
 684                         } else {
 685                                 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 686                                         wildcard++;
 687                         }
 688                         if (wildcard && !wild_okay)
 689                                 continue;
 690                         if (wildcard < matchwild &&
 691                             (cred == NULL ||
 692                              cred->cr_prison ==
 693                                         inp->inp_socket->so_cred->cr_prison)) {
 694                                 match = inp;
 695                                 matchwild = wildcard;
 696                                 if (wildcard == 0)
 697                                         break;
 698                                 else
 699                                         matchwild = wildcard;
 700                         }
 701                 }
 702         }
 703         return (match);
 704 }
 705
 706 void
 707 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 708 {
 709         struct in6pcb *in6p, *marker;
 710         struct ip6_moptions *im6o;
 711         struct in6_multi_mship *imm, *nimm;
 712
 713         /*
 714          * We only need to make sure that we are in netisr0, where all
 715          * multicast operation happen.  We could check inpcbinfo which
 716          * does not belong to netisr0 by holding the inpcbinfo's token.
 717          * In this case, the pcbinfo must be able to be shared, i.e.
 718          * pcbinfo->infotoken is not NULL.
 719          */
 720         ASSERT_IN_NETISR(0);
 721         KASSERT(pcbinfo->cpu == 0 || pcbinfo->infotoken != NULL,
 722             ("pcbinfo could not be shared"));
 723
 724         /*
 725          * Get a marker for the current netisr (netisr0).
 726          *
 727          * It is possible that the multicast address deletion blocks,
 728          * which could cause temporary token releasing.  So we use
 729          * inpcb marker here to get a coherent view of the inpcb list.
 730          *
 731          * While, on the other hand, moptions are only added and deleted
 732          * in netisr0, so we would not see staled moption or miss moption
 733          * even if the token was released due to the blocking multicast
 734          * address deletion.
 735          */
 736         marker = in_pcbmarker(mycpuid);
 737
 738         GET_PCBINFO_TOKEN(pcbinfo);
 739
 740         LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list);
 741         while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) {
 742                 LIST_REMOVE(marker, inp_list);
 743                 LIST_INSERT_AFTER(in6p, marker, inp_list);
 744
 745                 if (in6p->in6p_flags & INP_PLACEMARKER)
 746                         continue;
 747                 im6o = in6p->in6p_moptions;
 748                 if (INP_ISIPV6(in6p) && im6o) {
 749                         /*
 750                          * Unselect the outgoing interface if it is being
 751                          * detached.
 752                          */
 753                         if (im6o->im6o_multicast_ifp == ifp)
 754                                 im6o->im6o_multicast_ifp = NULL;
 755
 756                         /*
 757                          * Drop multicast group membership if we joined
 758                          * through the interface being detached.
 759                          * XXX controversial - is it really legal for kernel
 760                          * to force this?
 761                          */
 762                         for (imm = im6o->im6o_memberships.lh_first;
 763                              imm != NULL; imm = nimm) {
 764                                 nimm = imm->i6mm_chain.le_next;
 765                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 766                                         LIST_REMOVE(imm, i6mm_chain);
 767                                         in6_delmulti(imm->i6mm_maddr);
 768                                         kfree(imm, M_IPMADDR);
 769                                 }
 770                         }
 771                 }
 772         }
 773         LIST_REMOVE(marker, inp_list);
 774
 775         REL_PCBINFO_TOKEN(pcbinfo);
 776 }
 777
 778 /*
 779  * Check for alternatives when higher level complains
 780  * about service problems.  For now, invalidate cached
 781  * routing information.  If the route was created dynamically
 782  * (by a redirect), time to try a default gateway again.
 783  */
 784 void
 785 in6_losing(struct inpcb *in6p)
 786 {
 787         struct rtentry *rt;
 788         struct rt_addrinfo info;
 789
 790         if ((rt = in6p->in6p_route.ro_rt) != NULL) {
 791                 bzero((caddr_t)&info, sizeof(info));
 792                 info.rti_flags = rt->rt_flags;
 793                 info.rti_info[RTAX_DST] = rt_key(rt);
 794                 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 795                 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 796                 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
 797                 if (rt->rt_flags & RTF_DYNAMIC) {
 798                         rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
 799                             rt_mask(rt), rt->rt_flags, NULL);
 800                 }
 801                 in6p->in6p_route.ro_rt = NULL;
 802                 rtfree(rt);
 803                 /*
 804                  * A new route can be allocated
 805                  * the next time output is attempted.
 806                  */
 807         }
 808 }
 809
 810 /*
 811  * After a routing change, flush old routing
 812  * and allocate a (hopefully) better one.
 813  */
 814 void
 815 in6_rtchange(struct inpcb *inp, int error)
 816 {
 817         if (inp->in6p_route.ro_rt) {
 818                 rtfree(inp->in6p_route.ro_rt);
 819                 inp->in6p_route.ro_rt = 0;
 820                 /*
 821                  * A new route can be allocated the next time
 822                  * output is attempted.
 823                  */
 824         }
 825 }
 826
 827 /*
 828  * Lookup PCB in hash list.
 829  */
 830 struct inpcb *
 831 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
 832                    u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
 833                    int wildcard, struct ifnet *ifp)
 834 {
 835         struct inpcbhead *head;
 836         struct inpcb *inp;
 837         struct inpcb *jinp = NULL;
 838         u_short fport = fport_arg, lport = lport_arg;
 839         int faith;
 840
 841         if (faithprefix_p != NULL)
 842                 faith = (*faithprefix_p)(laddr);
 843         else
 844                 faith = 0;
 845
 846         /*
 847          * First look for an exact match.
 848          */
 849         head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
 850                                               fport,
 851                                               laddr->s6_addr32[3], /* XXX JH */
 852                                               lport,
 853                                               pcbinfo->hashmask)];
 854         LIST_FOREACH(inp, head, inp_hash) {
 855                 if (!INP_ISIPV6(inp))
 856                         continue;
 857                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 858                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 859                     inp->inp_fport == fport &&
 860                     inp->inp_lport == lport) {
 861                         /*
 862                          * Found.
 863                          */
 864                         if (inp->inp_socket == NULL ||
 865                         inp->inp_socket->so_cred->cr_prison == NULL) {
 866                                 return (inp);
 867                         } else {
 868                                 if  (jinp == NULL)
 869                                         jinp = inp;
 870                         }
 871                 }
 872         }
 873         if (jinp != NULL)
 874                 return(jinp);
 875
 876         if (wildcard) {
 877                 struct inpcontainerhead *chead;
 878                 struct inpcontainer *ic;
 879                 struct inpcb *local_wild = NULL;
 880                 struct inpcb *jinp_wild = NULL;
 881                 struct sockaddr_in6 jsin6;
 882                 struct ucred *cred;
 883
 884                 /*
 885                  * Order of socket selection:
 886                  * 1. non-jailed, non-wild.
 887                  * 2. non-jailed, wild.
 888                  * 3. jailed, non-wild.
 889                  * 4. jailed, wild.
 890                  */
 891                 jsin6.sin6_family = AF_INET6;
 892                 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
 893                     pcbinfo->wildcardhashmask)];
 894
 895                 GET_PCBINFO_TOKEN(pcbinfo);
 896                 LIST_FOREACH(ic, chead, ic_list) {
 897                         inp = ic->ic_inp;
 898                         if (inp->inp_flags & INP_PLACEMARKER)
 899                                 continue;
 900
 901                         if (!INP_ISIPV6(inp))
 902                                 continue;
 903                         if (inp->inp_socket != NULL)
 904                                 cred = inp->inp_socket->so_cred;
 905                         else
 906                                 cred = NULL;
 907
 908                         if (cred != NULL && jailed(cred)) {
 909                                 if (jinp != NULL) {
 910                                         continue;
 911                                 } else {
 912                                         jsin6.sin6_addr = *laddr;
 913                                         if (!jailed_ip(cred->cr_prison,
 914                                             (struct sockaddr *)&jsin6))
 915                                                 continue;
 916                                 }
 917                         }
 918                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 919                             inp->inp_lport == lport) {
 920                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
 921                                         continue;
 922                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 923                                                        laddr)) {
 924                                         if (cred != NULL && jailed(cred)) {
 925                                                 jinp = inp;
 926                                         } else {
 927                                                 REL_PCBINFO_TOKEN(pcbinfo);
 928                                                 return (inp);
 929                                         }
 930                                 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 931                                         if (cred != NULL && jailed(cred))
 932                                                 jinp_wild = inp;
 933                                         else
 934                                                 local_wild = inp;
 935                                 }
 936                         }
 937                 }
 938                 REL_PCBINFO_TOKEN(pcbinfo);
 939
 940                 if (local_wild != NULL)
 941                         return (local_wild);
 942                 if (jinp != NULL)
 943                         return (jinp);
 944                 return (jinp_wild);
 945         }
 946
 947         /*
 948          * Not found.
 949          */
 950         return (NULL);
 951 }
 952
 953 void
 954 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
 955 {
 956         struct ip6_hdr *ip;
 957
 958         ip = mtod(m, struct ip6_hdr *);
 959         bzero(sin6, sizeof(*sin6));
 960         sin6->sin6_len = sizeof(*sin6);
 961         sin6->sin6_family = AF_INET6;
 962         sin6->sin6_addr = ip->ip6_src;
 963         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 964                 sin6->sin6_addr.s6_addr16[1] = 0;
 965         sin6->sin6_scope_id =
 966                 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 967                 ? m->m_pkthdr.rcvif->if_index : 0;
 968
 969         return;
 970 }
 971
 972 void
 973 in6_savefaddr(struct socket *so, const struct sockaddr *faddr)
 974 {
 975         struct sockaddr_in6 *sin6;
 976
 977         KASSERT(faddr->sa_family == AF_INET6,
 978             ("not AF_INET6 faddr %d", faddr->sa_family));
 979
 980         sin6 = kmalloc(sizeof(*sin6), M_SONAME, M_WAITOK | M_ZERO);
 981         sin6->sin6_family = AF_INET6;
 982         sin6->sin6_len = sizeof(*sin6);
 983
 984         sin6->sin6_port = ((const struct sockaddr_in6 *)faddr)->sin6_port;
 985         sin6->sin6_addr = ((const struct sockaddr_in6 *)faddr)->sin6_addr;
 986
 987         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 988                 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
 989         else
 990                 sin6->sin6_scope_id = 0;        /*XXX*/
 991         if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
 992                 sin6->sin6_addr.s6_addr16[1] = 0;
 993
 994         so->so_faddr = (struct sockaddr *)sin6;
 995 }