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