sys/netinet6/in6_pcb.c

   1 /*      $FreeBSD$       */
   2 /*      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $        */
   3
   4 /*-
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 /*-
  35  * Copyright (c) 1982, 1986, 1991, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 4. Neither the name of the University nor the names of its contributors
  47  *    may be used to endorse or promote products derived from this software
  48  *    without specific prior written permission.
  49  *
  50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  60  * SUCH DAMAGE.
  61  *
  62  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
  63  */
  64
  65 #include "opt_inet.h"
  66 #include "opt_inet6.h"
  67 #include "opt_ipsec.h"
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/malloc.h>
  72 #include <sys/mbuf.h>
  73 #include <sys/domain.h>
  74 #include <sys/protosw.h>
  75 #include <sys/socket.h>
  76 #include <sys/socketvar.h>
  77 #include <sys/sockio.h>
  78 #include <sys/errno.h>
  79 #include <sys/time.h>
  80 #include <sys/proc.h>
  81 #include <sys/jail.h>
  82
  83 #include <vm/uma.h>
  84
  85 #include <net/if.h>
  86 #include <net/if_types.h>
  87 #include <net/route.h>
  88
  89 #include <netinet/in.h>
  90 #include <netinet/in_var.h>
  91 #include <netinet/in_systm.h>
  92 #include <netinet/tcp_var.h>
  93 #include <netinet/ip6.h>
  94 #include <netinet/ip_var.h>
  95 #include <netinet6/ip6_var.h>
  96 #include <netinet6/nd6.h>
  97 #include <netinet/in_pcb.h>
  98 #include <netinet6/in6_pcb.h>
  99 #include <netinet6/scope6_var.h>
 100
 101 #ifdef IPSEC
 102 #include <netinet6/ipsec.h>
 103 #ifdef INET6
 104 #include <netinet6/ipsec6.h>
 105 #endif
 106 #include <netinet6/ah.h>
 107 #ifdef INET6
 108 #include <netinet6/ah6.h>
 109 #endif
 110 #include <netkey/key.h>
 111 #endif /* IPSEC */
 112
 113 #ifdef FAST_IPSEC
 114 #include <netipsec/ipsec.h>
 115 #include <netipsec/ipsec6.h>
 116 #include <netipsec/key.h>
 117 #endif /* FAST_IPSEC */
 118
 119 struct  in6_addr zeroin6_addr;
 120
 121 int
 122 in6_pcbbind(inp, nam, cred)
 123         register struct inpcb *inp;
 124         struct sockaddr *nam;
 125         struct ucred *cred;
 126 {
 127         struct socket *so = inp->inp_socket;
 128         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 129         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 130         u_short lport = 0;
 131         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 132
 133         INP_INFO_WLOCK_ASSERT(pcbinfo);
 134         INP_LOCK_ASSERT(inp);
 135
 136         if (!in6_ifaddr) /* XXX broken! */
 137                 return (EADDRNOTAVAIL);
 138         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 139                 return (EINVAL);
 140         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 141                 wild = 1;
 142         if (nam) {
 143                 int error;
 144
 145                 sin6 = (struct sockaddr_in6 *)nam;
 146                 if (nam->sa_len != sizeof(*sin6))
 147                         return (EINVAL);
 148                 /*
 149                  * family check.
 150                  */
 151                 if (nam->sa_family != AF_INET6)
 152                         return (EAFNOSUPPORT);
 153
 154                 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
 155                         return(error);
 156
 157                 lport = sin6->sin6_port;
 158                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 159                         /*
 160                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 161                          * allow compepte duplication of binding if
 162                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 163                          * and a multicast address is bound on both
 164                          * new and duplicated sockets.
 165                          */
 166                         if (so->so_options & SO_REUSEADDR)
 167                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 168                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 169                         struct ifaddr *ia = NULL;
 170
 171                         sin6->sin6_port = 0;            /* yech... */
 172                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
 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                 if (lport) {
 188                         struct inpcb *t;
 189
 190                         /* GROSS */
 191                         if (ntohs(lport) < IPV6PORT_RESERVED &&
 192                             suser_cred(cred, SUSER_ALLOWJAIL))
 193                                 return (EACCES);
 194                         if (so->so_cred->cr_uid != 0 &&
 195                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 196                                 t = in6_pcblookup_local(pcbinfo,
 197                                     &sin6->sin6_addr, lport,
 198                                     INPLOOKUP_WILDCARD);
 199                                 if (t &&
 200                                     ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
 201                                     (so->so_type != SOCK_STREAM ||
 202                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
 203                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 204                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 205                                      (t->inp_socket->so_options & SO_REUSEPORT)
 206                                       == 0) && (so->so_cred->cr_uid !=
 207                                      t->inp_socket->so_cred->cr_uid))
 208                                         return (EADDRINUSE);
 209                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 210                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 211                                         struct sockaddr_in sin;
 212
 213                                         in6_sin6_2_sin(&sin, sin6);
 214                                         t = in_pcblookup_local(pcbinfo,
 215                                                 sin.sin_addr, lport,
 216                                                 INPLOOKUP_WILDCARD);
 217                                         if (t &&
 218                                             ((t->inp_vflag &
 219                                               INP_TIMEWAIT) == 0) &&
 220                                             (so->so_type != SOCK_STREAM ||
 221                                              ntohl(t->inp_faddr.s_addr) ==
 222                                               INADDR_ANY) &&
 223                                             (so->so_cred->cr_uid !=
 224                                              t->inp_socket->so_cred->cr_uid))
 225                                                 return (EADDRINUSE);
 226                                 }
 227                         }
 228                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 229                                                 lport, wild);
 230                         if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
 231                             intotw(t)->tw_so_options :
 232                             t->inp_socket->so_options)) == 0)
 233                                 return (EADDRINUSE);
 234                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 235                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 236                                 struct sockaddr_in sin;
 237
 238                                 in6_sin6_2_sin(&sin, sin6);
 239                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 240                                                        lport, wild);
 241                                 if (t && t->inp_vflag & INP_TIMEWAIT) {
 242                                         if ((reuseport &
 243                                             intotw(t)->tw_so_options) == 0 &&
 244                                             (ntohl(t->inp_laddr.s_addr) !=
 245                                              INADDR_ANY || ((inp->inp_vflag &
 246                                              INP_IPV6PROTO) ==
 247                                              (t->inp_vflag & INP_IPV6PROTO))))
 248                                                 return (EADDRINUSE);
 249                                 }
 250                                 else if (t &&
 251                                     (reuseport & t->inp_socket->so_options)
 252                                     == 0 && (ntohl(t->inp_laddr.s_addr) !=
 253                                     INADDR_ANY || INP_SOCKAF(so) ==
 254                                      INP_SOCKAF(t->inp_socket)))
 255                                         return (EADDRINUSE);
 256                         }
 257                 }
 258                 inp->in6p_laddr = sin6->sin6_addr;
 259         }
 260         if (lport == 0) {
 261                 int e;
 262                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
 263                         return (e);
 264         }
 265         else {
 266                 inp->inp_lport = lport;
 267                 if (in_pcbinshash(inp) != 0) {
 268                         inp->in6p_laddr = in6addr_any;
 269                         inp->inp_lport = 0;
 270                         return (EAGAIN);
 271                 }
 272         }
 273         return (0);
 274 }
 275
 276 /*
 277  *   Transform old in6_pcbconnect() into an inner subroutine for new
 278  *   in6_pcbconnect(): Do some validity-checking on the remote
 279  *   address (in mbuf 'nam') and then determine local host address
 280  *   (i.e., which interface) to use to access that remote host.
 281  *
 282  *   This preserves definition of in6_pcbconnect(), while supporting a
 283  *   slightly different version for T/TCP.  (This is more than
 284  *   a bit of a kludge, but cleaning up the internal interfaces would
 285  *   have forced minor changes in every protocol).
 286  */
 287
 288 int
 289 in6_pcbladdr(inp, nam, plocal_addr6)
 290         register struct inpcb *inp;
 291         struct sockaddr *nam;
 292         struct in6_addr **plocal_addr6;
 293 {
 294         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 295         int error = 0;
 296         struct ifnet *ifp = NULL;
 297         int scope_ambiguous = 0;
 298
 299         if (nam->sa_len != sizeof (*sin6))
 300                 return (EINVAL);
 301         if (sin6->sin6_family != AF_INET6)
 302                 return (EAFNOSUPPORT);
 303         if (sin6->sin6_port == 0)
 304                 return (EADDRNOTAVAIL);
 305
 306         if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
 307                 scope_ambiguous = 1;
 308         if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
 309                 return(error);
 310
 311         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 312         INP_LOCK_ASSERT(inp);
 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 = in6addr_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, NULL,
 330                                       &inp->in6p_laddr, &ifp, &error);
 331         if (ifp && scope_ambiguous &&
 332             (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
 333                 return(error);
 334         }
 335
 336         if (*plocal_addr6 == 0) {
 337                 if (error == 0)
 338                         error = EADDRNOTAVAIL;
 339                 return (error);
 340         }
 341         /*
 342          * Don't do pcblookup call here; return interface in
 343          * plocal_addr6
 344          * and exit to caller, that will do the lookup.
 345          */
 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(inp, nam, cred)
 359         register struct inpcb *inp;
 360         struct sockaddr *nam;
 361         struct ucred *cred;
 362 {
 363         struct in6_addr *addr6;
 364         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 365         int error;
 366
 367         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 368         INP_LOCK_ASSERT(inp);
 369
 370         /*
 371          * Call inner routine, to assign local interface address.
 372          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 373          */
 374         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 375                 return (error);
 376
 377         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
 378                                sin6->sin6_port,
 379                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 380                               ? addr6 : &inp->in6p_laddr,
 381                               inp->inp_lport, 0, NULL) != NULL) {
 382                 return (EADDRINUSE);
 383         }
 384         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 385                 if (inp->inp_lport == 0) {
 386                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
 387                         if (error)
 388                                 return (error);
 389                 }
 390                 inp->in6p_laddr = *addr6;
 391         }
 392         inp->in6p_faddr = sin6->sin6_addr;
 393         inp->inp_fport = sin6->sin6_port;
 394         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 395         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 396         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 397                 inp->in6p_flowinfo |=
 398                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 399
 400         in_pcbrehash(inp);
 401 #ifdef IPSEC
 402         if (inp->inp_socket->so_type == SOCK_STREAM)
 403                 ipsec_pcbconn(inp->inp_sp);
 404 #endif
 405         return (0);
 406 }
 407
 408 void
 409 in6_pcbdisconnect(inp)
 410         struct inpcb *inp;
 411 {
 412
 413         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 414         INP_LOCK_ASSERT(inp);
 415
 416         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 417         inp->inp_fport = 0;
 418         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 419         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 420         in_pcbrehash(inp);
 421 #ifdef IPSEC
 422         ipsec_pcbdisconn(inp->inp_sp);
 423 #endif
 424         if (inp->inp_socket->so_state & SS_NOFDREF)
 425                 in6_pcbdetach(inp);
 426 }
 427
 428 void
 429 in6_pcbdetach(inp)
 430         struct inpcb *inp;
 431 {
 432         struct socket *so = inp->inp_socket;
 433         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 434
 435         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 436         INP_LOCK_ASSERT(inp);
 437
 438 #if defined(IPSEC) || defined(FAST_IPSEC)
 439         if (inp->in6p_sp != NULL)
 440                 ipsec6_delete_pcbpolicy(inp);
 441 #endif /* IPSEC */
 442         inp->inp_gencnt = ++ipi->ipi_gencnt;
 443         in_pcbremlists(inp);
 444
 445         if (so) {
 446                 ACCEPT_LOCK();
 447                 SOCK_LOCK(so);
 448                 so->so_pcb = NULL;
 449                 sotryfree(so);
 450         }
 451
 452         ip6_freepcbopts(inp->in6p_outputopts);
 453         ip6_freemoptions(inp->in6p_moptions);
 454         /* Check and free IPv4 related resources in case of mapped addr */
 455         if (inp->inp_options)
 456                 (void)m_free(inp->inp_options);
 457         ip_freemoptions(inp->inp_moptions);
 458         inp->inp_vflag = 0;
 459         INP_LOCK_DESTROY(inp);
 460         uma_zfree(ipi->ipi_zone, inp);
 461 }
 462
 463 struct sockaddr *
 464 in6_sockaddr(port, addr_p)
 465         in_port_t port;
 466         struct in6_addr *addr_p;
 467 {
 468         struct sockaddr_in6 *sin6;
 469
 470         MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
 471         bzero(sin6, sizeof *sin6);
 472         sin6->sin6_family = AF_INET6;
 473         sin6->sin6_len = sizeof(*sin6);
 474         sin6->sin6_port = port;
 475         sin6->sin6_addr = *addr_p;
 476         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
 477
 478         return (struct sockaddr *)sin6;
 479 }
 480
 481 struct sockaddr *
 482 in6_v4mapsin6_sockaddr(port, addr_p)
 483         in_port_t port;
 484         struct in_addr *addr_p;
 485 {
 486         struct sockaddr_in sin;
 487         struct sockaddr_in6 *sin6_p;
 488
 489         bzero(&sin, sizeof sin);
 490         sin.sin_family = AF_INET;
 491         sin.sin_len = sizeof(sin);
 492         sin.sin_port = port;
 493         sin.sin_addr = *addr_p;
 494
 495         MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
 496                 M_WAITOK);
 497         in6_sin_2_v4mapsin6(&sin, sin6_p);
 498
 499         return (struct sockaddr *)sin6_p;
 500 }
 501
 502 /*
 503  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 504  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 505  * in struct pr_usrreqs, so that protocols can just reference then directly
 506  * without the need for a wrapper function.  The socket must have a valid
 507  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 508  * except through a kernel programming error, so it is acceptable to panic
 509  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 510  * because there actually /is/ a programming error somewhere... XXX)
 511  */
 512 int
 513 in6_setsockaddr(so, nam)
 514         struct socket *so;
 515         struct sockaddr **nam;
 516 {
 517         int s;
 518         register struct inpcb *inp;
 519         struct in6_addr addr;
 520         in_port_t port;
 521
 522         s = splnet();
 523         inp = sotoinpcb(so);
 524         if (!inp) {
 525                 splx(s);
 526                 return EINVAL;
 527         }
 528         port = inp->inp_lport;
 529         addr = inp->in6p_laddr;
 530         splx(s);
 531
 532         *nam = in6_sockaddr(port, &addr);
 533         return 0;
 534 }
 535
 536 int
 537 in6_setpeeraddr(so, nam)
 538         struct socket *so;
 539         struct sockaddr **nam;
 540 {
 541         int s;
 542         struct inpcb *inp;
 543         struct in6_addr addr;
 544         in_port_t port;
 545
 546         s = splnet();
 547         inp = sotoinpcb(so);
 548         if (!inp) {
 549                 splx(s);
 550                 return EINVAL;
 551         }
 552         port = inp->inp_fport;
 553         addr = inp->in6p_faddr;
 554         splx(s);
 555
 556         *nam = in6_sockaddr(port, &addr);
 557         return 0;
 558 }
 559
 560 int
 561 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 562 {
 563         struct  inpcb *inp = sotoinpcb(so);
 564         int     error;
 565
 566         if (inp == NULL)
 567                 return EINVAL;
 568         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 569                 error = in_setsockaddr(so, nam, &tcbinfo);
 570                 if (error == 0)
 571                         in6_sin_2_v4mapsin6_in_sock(nam);
 572         } else {
 573                 /* scope issues will be handled in in6_setsockaddr(). */
 574                 error = in6_setsockaddr(so, nam);
 575         }
 576
 577         return error;
 578 }
 579
 580 int
 581 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 582 {
 583         struct  inpcb *inp = sotoinpcb(so);
 584         int     error;
 585
 586         if (inp == NULL)
 587                 return EINVAL;
 588         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 589                 error = in_setpeeraddr(so, nam, &tcbinfo);
 590                 if (error == 0)
 591                         in6_sin_2_v4mapsin6_in_sock(nam);
 592         } else
 593         /* scope issues will be handled in in6_setpeeraddr(). */
 594         error = in6_setpeeraddr(so, nam);
 595
 596         return error;
 597 }
 598
 599 /*
 600  * Pass some notification to all connections of a protocol
 601  * associated with address dst.  The local address and/or port numbers
 602  * may be specified to limit the search.  The "usual action" will be
 603  * taken, depending on the ctlinput cmd.  The caller must filter any
 604  * cmds that are uninteresting (e.g., no error in the map).
 605  * Call the protocol specific routine (if any) to report
 606  * any errors for each matching socket.
 607  *
 608  * Must be called at splnet.
 609  */
 610 void
 611 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify)
 612         struct inpcbinfo *pcbinfo;
 613         struct sockaddr *dst;
 614         const struct sockaddr *src;
 615         u_int fport_arg, lport_arg;
 616         int cmd;
 617         void *cmdarg;
 618         struct inpcb *(*notify) __P((struct inpcb *, int));
 619 {
 620         struct inpcbhead *head;
 621         struct inpcb *inp, *ninp;
 622         struct sockaddr_in6 sa6_src, *sa6_dst;
 623         u_short fport = fport_arg, lport = lport_arg;
 624         u_int32_t flowinfo;
 625         int errno, s;
 626
 627         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 628                 return;
 629
 630         sa6_dst = (struct sockaddr_in6 *)dst;
 631         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 632                 return;
 633
 634         /*
 635          * note that src can be NULL when we get notify by local fragmentation.
 636          */
 637         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 638         flowinfo = sa6_src.sin6_flowinfo;
 639
 640         /*
 641          * Redirects go to all references to the destination,
 642          * and use in6_rtchange to invalidate the route cache.
 643          * Dead host indications: also use in6_rtchange to invalidate
 644          * the cache, and deliver the error to all the sockets.
 645          * Otherwise, if we have knowledge of the local port and address,
 646          * deliver only to that socket.
 647          */
 648         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 649                 fport = 0;
 650                 lport = 0;
 651                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 652
 653                 if (cmd != PRC_HOSTDEAD)
 654                         notify = in6_rtchange;
 655         }
 656         errno = inet6ctlerrmap[cmd];
 657         s = splnet();
 658         head = pcbinfo->listhead;
 659         INP_INFO_WLOCK(pcbinfo);
 660         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 661                 INP_LOCK(inp);
 662                 ninp = LIST_NEXT(inp, inp_list);
 663
 664                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 665                         INP_UNLOCK(inp);
 666                         continue;
 667                 }
 668
 669                 /*
 670                  * If the error designates a new path MTU for a destination
 671                  * and the application (associated with this socket) wanted to
 672                  * know the value, notify. Note that we notify for all
 673                  * disconnected sockets if the corresponding application
 674                  * wanted. This is because some UDP applications keep sending
 675                  * sockets disconnected.
 676                  * XXX: should we avoid to notify the value to TCP sockets?
 677                  */
 678                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 679                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 680                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 681                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
 682                                         (u_int32_t *)cmdarg);
 683                 }
 684
 685                 /*
 686                  * Detect if we should notify the error. If no source and
 687                  * destination ports are specifed, but non-zero flowinfo and
 688                  * local address match, notify the error. This is the case
 689                  * when the error is delivered with an encrypted buffer
 690                  * by ESP. Otherwise, just compare addresses and ports
 691                  * as usual.
 692                  */
 693                 if (lport == 0 && fport == 0 && flowinfo &&
 694                     inp->inp_socket != NULL &&
 695                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 696                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 697                         goto do_notify;
 698                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 699                                              &sa6_dst->sin6_addr) ||
 700                          inp->inp_socket == 0 ||
 701                          (lport && inp->inp_lport != lport) ||
 702                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 703                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 704                                               &sa6_src.sin6_addr)) ||
 705                          (fport && inp->inp_fport != fport)) {
 706                         INP_UNLOCK(inp);
 707                         continue;
 708                 }
 709
 710           do_notify:
 711                 if (notify) {
 712                         if ((*notify)(inp, errno))
 713                                 INP_UNLOCK(inp);
 714                 } else
 715                         INP_UNLOCK(inp);
 716         }
 717         INP_INFO_WUNLOCK(pcbinfo);
 718         splx(s);
 719 }
 720
 721 /*
 722  * Lookup a PCB based on the local address and port.
 723  */
 724 struct inpcb *
 725 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 726         struct inpcbinfo *pcbinfo;
 727         struct in6_addr *laddr;
 728         u_int lport_arg;
 729         int wild_okay;
 730 {
 731         register struct inpcb *inp;
 732         int matchwild = 3, wildcard;
 733         u_short lport = lport_arg;
 734
 735         if (!wild_okay) {
 736                 struct inpcbhead *head;
 737                 /*
 738                  * Look for an unconnected (wildcard foreign addr) PCB that
 739                  * matches the local address and port we're looking for.
 740                  */
 741                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 742                                                       pcbinfo->hashmask)];
 743                 LIST_FOREACH(inp, head, inp_hash) {
 744                         if ((inp->inp_vflag & INP_IPV6) == 0)
 745                                 continue;
 746                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 747                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 748                             inp->inp_lport == lport) {
 749                                 /*
 750                                  * Found.
 751                                  */
 752                                 return (inp);
 753                         }
 754                 }
 755                 /*
 756                  * Not found.
 757                  */
 758                 return (NULL);
 759         } else {
 760                 struct inpcbporthead *porthash;
 761                 struct inpcbport *phd;
 762                 struct inpcb *match = NULL;
 763                 /*
 764                  * Best fit PCB lookup.
 765                  *
 766                  * First see if this local port is in use by looking on the
 767                  * port hash list.
 768                  */
 769                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 770                     pcbinfo->porthashmask)];
 771                 LIST_FOREACH(phd, porthash, phd_hash) {
 772                         if (phd->phd_port == lport)
 773                                 break;
 774                 }
 775                 if (phd != NULL) {
 776                         /*
 777                          * Port is in use by one or more PCBs. Look for best
 778                          * fit.
 779                          */
 780                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 781                                 wildcard = 0;
 782                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 783                                         continue;
 784                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 785                                         wildcard++;
 786                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 787                                         &inp->in6p_laddr)) {
 788                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 789                                                 wildcard++;
 790                                         else if (!IN6_ARE_ADDR_EQUAL(
 791                                                 &inp->in6p_laddr, laddr))
 792                                                 continue;
 793                                 } else {
 794                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 795                                                 wildcard++;
 796                                 }
 797                                 if (wildcard < matchwild) {
 798                                         match = inp;
 799                                         matchwild = wildcard;
 800                                         if (matchwild == 0) {
 801                                                 break;
 802                                         }
 803                                 }
 804                         }
 805                 }
 806                 return (match);
 807         }
 808 }
 809
 810 void
 811 in6_pcbpurgeif0(head, ifp)
 812         struct in6pcb *head;
 813         struct ifnet *ifp;
 814 {
 815         struct in6pcb *in6p;
 816         struct ip6_moptions *im6o;
 817         struct in6_multi_mship *imm, *nimm;
 818
 819         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
 820                 im6o = in6p->in6p_moptions;
 821                 if ((in6p->inp_vflag & INP_IPV6) &&
 822                     im6o) {
 823                         /*
 824                          * Unselect the outgoing interface if it is being
 825                          * detached.
 826                          */
 827                         if (im6o->im6o_multicast_ifp == ifp)
 828                                 im6o->im6o_multicast_ifp = NULL;
 829
 830                         /*
 831                          * Drop multicast group membership if we joined
 832                          * through the interface being detached.
 833                          * XXX controversial - is it really legal for kernel
 834                          * to force this?
 835                          */
 836                         for (imm = im6o->im6o_memberships.lh_first;
 837                              imm != NULL; imm = nimm) {
 838                                 nimm = imm->i6mm_chain.le_next;
 839                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 840                                         LIST_REMOVE(imm, i6mm_chain);
 841                                         in6_delmulti(imm->i6mm_maddr);
 842                                         free(imm, M_IP6MADDR);
 843                                 }
 844                         }
 845                 }
 846         }
 847 }
 848
 849 /*
 850  * Check for alternatives when higher level complains
 851  * about service problems.  For now, invalidate cached
 852  * routing information.  If the route was created dynamically
 853  * (by a redirect), time to try a default gateway again.
 854  */
 855 void
 856 in6_losing(in6p)
 857         struct inpcb *in6p;
 858 {
 859         /*
 860          * We don't store route pointers in the routing table anymore
 861          */
 862         return;
 863 }
 864
 865 /*
 866  * After a routing change, flush old routing
 867  * and allocate a (hopefully) better one.
 868  */
 869 struct inpcb *
 870 in6_rtchange(inp, errno)
 871         struct inpcb *inp;
 872         int errno;
 873 {
 874         /*
 875          * We don't store route pointers in the routing table anymore
 876          */
 877         return inp;
 878 }
 879
 880 /*
 881  * Lookup PCB in hash list.
 882  */
 883 struct inpcb *
 884 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
 885         struct inpcbinfo *pcbinfo;
 886         struct in6_addr *faddr, *laddr;
 887         u_int fport_arg, lport_arg;
 888         int wildcard;
 889         struct ifnet *ifp;
 890 {
 891         struct inpcbhead *head;
 892         register struct inpcb *inp;
 893         u_short fport = fport_arg, lport = lport_arg;
 894         int faith;
 895
 896         if (faithprefix_p != NULL)
 897                 faith = (*faithprefix_p)(laddr);
 898         else
 899                 faith = 0;
 900
 901         /*
 902          * First look for an exact match.
 903          */
 904         head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */,
 905                                               lport, fport,
 906                                               pcbinfo->hashmask)];
 907         LIST_FOREACH(inp, head, inp_hash) {
 908                 if ((inp->inp_vflag & INP_IPV6) == 0)
 909                         continue;
 910                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 911                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 912                     inp->inp_fport == fport &&
 913                     inp->inp_lport == lport) {
 914                         /*
 915                          * Found.
 916                          */
 917                         return (inp);
 918                 }
 919         }
 920         if (wildcard) {
 921                 struct inpcb *local_wild = NULL;
 922
 923                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 924                                                       pcbinfo->hashmask)];
 925                 LIST_FOREACH(inp, head, inp_hash) {
 926                         if ((inp->inp_vflag & INP_IPV6) == 0)
 927                                 continue;
 928                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 929                             inp->inp_lport == lport) {
 930                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
 931                                         continue;
 932                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 933                                                        laddr))
 934                                         return (inp);
 935                                 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 936                                         local_wild = inp;
 937                         }
 938                 }
 939                 return (local_wild);
 940         }
 941
 942         /*
 943          * Not found.
 944          */
 945         return (NULL);
 946 }
 947
 948 void
 949 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
 950 {
 951         struct ip6_hdr *ip;
 952
 953         ip = mtod(m, struct ip6_hdr *);
 954         bzero(sin6, sizeof(*sin6));
 955         sin6->sin6_len = sizeof(*sin6);
 956         sin6->sin6_family = AF_INET6;
 957         sin6->sin6_addr = ip->ip6_src;
 958
 959         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
 960
 961         return;
 962 }