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 #include "opt_mac.h"
  69
  70 #include <sys/param.h>
  71 #include <sys/systm.h>
  72 #include <sys/mac.h>
  73 #include <sys/malloc.h>
  74 #include <sys/mbuf.h>
  75 #include <sys/domain.h>
  76 #include <sys/protosw.h>
  77 #include <sys/socket.h>
  78 #include <sys/socketvar.h>
  79 #include <sys/sockio.h>
  80 #include <sys/errno.h>
  81 #include <sys/time.h>
  82 #include <sys/proc.h>
  83 #include <sys/jail.h>
  84
  85 #include <vm/uma.h>
  86
  87 #include <net/if.h>
  88 #include <net/if_types.h>
  89 #include <net/route.h>
  90
  91 #include <netinet/in.h>
  92 #include <netinet/in_var.h>
  93 #include <netinet/in_systm.h>
  94 #include <netinet/tcp_var.h>
  95 #include <netinet/ip6.h>
  96 #include <netinet/ip_var.h>
  97 #include <netinet6/ip6_var.h>
  98 #include <netinet6/nd6.h>
  99 #include <netinet/in_pcb.h>
 100 #include <netinet6/in6_pcb.h>
 101 #include <netinet6/scope6_var.h>
 102
 103 #ifdef IPSEC
 104 #include <netinet6/ipsec.h>
 105 #ifdef INET6
 106 #include <netinet6/ipsec6.h>
 107 #endif
 108 #include <netinet6/ah.h>
 109 #ifdef INET6
 110 #include <netinet6/ah6.h>
 111 #endif
 112 #include <netkey/key.h>
 113 #endif /* IPSEC */
 114
 115 #ifdef FAST_IPSEC
 116 #include <netipsec/ipsec.h>
 117 #include <netipsec/ipsec6.h>
 118 #include <netipsec/key.h>
 119 #endif /* FAST_IPSEC */
 120
 121 struct  in6_addr zeroin6_addr;
 122
 123 int
 124 in6_pcbbind(inp, nam, cred)
 125         register struct inpcb *inp;
 126         struct sockaddr *nam;
 127         struct ucred *cred;
 128 {
 129         struct socket *so = inp->inp_socket;
 130         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 131         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 132         u_short lport = 0;
 133         int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
 134
 135         INP_INFO_WLOCK_ASSERT(pcbinfo);
 136         INP_LOCK_ASSERT(inp);
 137
 138         if (!in6_ifaddr) /* XXX broken! */
 139                 return (EADDRNOTAVAIL);
 140         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 141                 return (EINVAL);
 142         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 143                 wild = 1;
 144         if (nam) {
 145                 int error;
 146
 147                 sin6 = (struct sockaddr_in6 *)nam;
 148                 if (nam->sa_len != sizeof(*sin6))
 149                         return (EINVAL);
 150                 /*
 151                  * family check.
 152                  */
 153                 if (nam->sa_family != AF_INET6)
 154                         return (EAFNOSUPPORT);
 155
 156                 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
 157                         return(error);
 158
 159                 lport = sin6->sin6_port;
 160                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 161                         /*
 162                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 163                          * allow compepte duplication of binding if
 164                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 165                          * and a multicast address is bound on both
 166                          * new and duplicated sockets.
 167                          */
 168                         if (so->so_options & SO_REUSEADDR)
 169                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 170                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 171                         struct ifaddr *ia = NULL;
 172
 173                         sin6->sin6_port = 0;            /* yech... */
 174                         if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
 175                                 return (EADDRNOTAVAIL);
 176
 177                         /*
 178                          * XXX: bind to an anycast address might accidentally
 179                          * cause sending a packet with anycast source address.
 180                          * We should allow to bind to a deprecated address, since
 181                          * the application dares to use it.
 182                          */
 183                         if (ia &&
 184                             ((struct in6_ifaddr *)ia)->ia6_flags &
 185                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 186                                 return (EADDRNOTAVAIL);
 187                         }
 188                 }
 189                 if (lport) {
 190                         struct inpcb *t;
 191
 192                         /* GROSS */
 193                         if (ntohs(lport) <= ipport_reservedhigh &&
 194                             ntohs(lport) >= ipport_reservedlow &&
 195                             suser_cred(cred, SUSER_ALLOWJAIL))
 196                                 return (EACCES);
 197                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
 198                             suser_cred(so->so_cred, SUSER_ALLOWJAIL) != 0) {
 199                                 t = in6_pcblookup_local(pcbinfo,
 200                                     &sin6->sin6_addr, lport,
 201                                     INPLOOKUP_WILDCARD);
 202                                 if (t &&
 203                                     ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
 204                                     (so->so_type != SOCK_STREAM ||
 205                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
 206                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 207                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 208                                      (t->inp_socket->so_options & SO_REUSEPORT)
 209                                       == 0) && (so->so_cred->cr_uid !=
 210                                      t->inp_socket->so_cred->cr_uid))
 211                                         return (EADDRINUSE);
 212                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 213                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 214                                         struct sockaddr_in sin;
 215
 216                                         in6_sin6_2_sin(&sin, sin6);
 217                                         t = in_pcblookup_local(pcbinfo,
 218                                                 sin.sin_addr, lport,
 219                                                 INPLOOKUP_WILDCARD);
 220                                         if (t &&
 221                                             ((t->inp_vflag &
 222                                               INP_TIMEWAIT) == 0) &&
 223                                             (so->so_type != SOCK_STREAM ||
 224                                              ntohl(t->inp_faddr.s_addr) ==
 225                                               INADDR_ANY) &&
 226                                             (so->so_cred->cr_uid !=
 227                                              t->inp_socket->so_cred->cr_uid))
 228                                                 return (EADDRINUSE);
 229                                 }
 230                         }
 231                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 232                                                 lport, wild);
 233                         if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
 234                             intotw(t)->tw_so_options :
 235                             t->inp_socket->so_options)) == 0)
 236                                 return (EADDRINUSE);
 237                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 238                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 239                                 struct sockaddr_in sin;
 240
 241                                 in6_sin6_2_sin(&sin, sin6);
 242                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 243                                                        lport, wild);
 244                                 if (t && t->inp_vflag & INP_TIMEWAIT) {
 245                                         if ((reuseport &
 246                                             intotw(t)->tw_so_options) == 0 &&
 247                                             (ntohl(t->inp_laddr.s_addr) !=
 248                                              INADDR_ANY || ((inp->inp_vflag &
 249                                              INP_IPV6PROTO) ==
 250                                              (t->inp_vflag & INP_IPV6PROTO))))
 251                                                 return (EADDRINUSE);
 252                                 }
 253                                 else if (t &&
 254                                     (reuseport & t->inp_socket->so_options)
 255                                     == 0 && (ntohl(t->inp_laddr.s_addr) !=
 256                                     INADDR_ANY || INP_SOCKAF(so) ==
 257                                      INP_SOCKAF(t->inp_socket)))
 258                                         return (EADDRINUSE);
 259                         }
 260                 }
 261                 inp->in6p_laddr = sin6->sin6_addr;
 262         }
 263         if (lport == 0) {
 264                 int e;
 265                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
 266                         return (e);
 267         }
 268         else {
 269                 inp->inp_lport = lport;
 270                 if (in_pcbinshash(inp) != 0) {
 271                         inp->in6p_laddr = in6addr_any;
 272                         inp->inp_lport = 0;
 273                         return (EAGAIN);
 274                 }
 275         }
 276         return (0);
 277 }
 278
 279 /*
 280  *   Transform old in6_pcbconnect() into an inner subroutine for new
 281  *   in6_pcbconnect(): Do some validity-checking on the remote
 282  *   address (in mbuf 'nam') and then determine local host address
 283  *   (i.e., which interface) to use to access that remote host.
 284  *
 285  *   This preserves definition of in6_pcbconnect(), while supporting a
 286  *   slightly different version for T/TCP.  (This is more than
 287  *   a bit of a kludge, but cleaning up the internal interfaces would
 288  *   have forced minor changes in every protocol).
 289  */
 290
 291 int
 292 in6_pcbladdr(inp, nam, plocal_addr6)
 293         register struct inpcb *inp;
 294         struct sockaddr *nam;
 295         struct in6_addr **plocal_addr6;
 296 {
 297         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 298         int error = 0;
 299         struct ifnet *ifp = NULL;
 300         int scope_ambiguous = 0;
 301
 302         if (nam->sa_len != sizeof (*sin6))
 303                 return (EINVAL);
 304         if (sin6->sin6_family != AF_INET6)
 305                 return (EAFNOSUPPORT);
 306         if (sin6->sin6_port == 0)
 307                 return (EADDRNOTAVAIL);
 308
 309         if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
 310                 scope_ambiguous = 1;
 311         if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
 312                 return(error);
 313
 314         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 315         INP_LOCK_ASSERT(inp);
 316
 317         if (in6_ifaddr) {
 318                 /*
 319                  * If the destination address is UNSPECIFIED addr,
 320                  * use the loopback addr, e.g ::1.
 321                  */
 322                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 323                         sin6->sin6_addr = in6addr_loopback;
 324         }
 325
 326         /*
 327          * XXX: in6_selectsrc might replace the bound local address
 328          * with the address specified by setsockopt(IPV6_PKTINFO).
 329          * Is it the intended behavior?
 330          */
 331         *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 332                                       inp->in6p_moptions, NULL,
 333                                       &inp->in6p_laddr, &ifp, &error);
 334         if (ifp && scope_ambiguous &&
 335             (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
 336                 return(error);
 337         }
 338
 339         if (*plocal_addr6 == 0) {
 340                 if (error == 0)
 341                         error = EADDRNOTAVAIL;
 342                 return (error);
 343         }
 344         /*
 345          * Don't do pcblookup call here; return interface in
 346          * plocal_addr6
 347          * and exit to caller, that will do the lookup.
 348          */
 349
 350         return (0);
 351 }
 352
 353 /*
 354  * Outer subroutine:
 355  * Connect from a socket to a specified address.
 356  * Both address and port must be specified in argument sin.
 357  * If don't have a local address for this socket yet,
 358  * then pick one.
 359  */
 360 int
 361 in6_pcbconnect(inp, nam, cred)
 362         register struct inpcb *inp;
 363         struct sockaddr *nam;
 364         struct ucred *cred;
 365 {
 366         struct in6_addr *addr6;
 367         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 368         int error;
 369
 370         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 371         INP_LOCK_ASSERT(inp);
 372
 373         /*
 374          * Call inner routine, to assign local interface address.
 375          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 376          */
 377         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 378                 return (error);
 379
 380         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
 381                                sin6->sin6_port,
 382                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 383                               ? addr6 : &inp->in6p_laddr,
 384                               inp->inp_lport, 0, NULL) != NULL) {
 385                 return (EADDRINUSE);
 386         }
 387         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 388                 if (inp->inp_lport == 0) {
 389                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
 390                         if (error)
 391                                 return (error);
 392                 }
 393                 inp->in6p_laddr = *addr6;
 394         }
 395         inp->in6p_faddr = sin6->sin6_addr;
 396         inp->inp_fport = sin6->sin6_port;
 397         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 398         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 399         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 400                 inp->in6p_flowinfo |=
 401                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 402
 403         in_pcbrehash(inp);
 404 #ifdef IPSEC
 405         if (inp->inp_socket->so_type == SOCK_STREAM)
 406                 ipsec_pcbconn(inp->inp_sp);
 407 #endif
 408         return (0);
 409 }
 410
 411 void
 412 in6_pcbdisconnect(inp)
 413         struct inpcb *inp;
 414 {
 415
 416         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 417         INP_LOCK_ASSERT(inp);
 418
 419         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 420         inp->inp_fport = 0;
 421         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 422         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 423         in_pcbrehash(inp);
 424 #ifdef IPSEC
 425         ipsec_pcbdisconn(inp->inp_sp);
 426 #endif
 427         if (inp->inp_socket->so_state & SS_NOFDREF)
 428                 in6_pcbdetach(inp);
 429 }
 430
 431 void
 432 in6_pcbdetach(inp)
 433         struct inpcb *inp;
 434 {
 435         struct socket *so = inp->inp_socket;
 436         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 437
 438         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 439         INP_LOCK_ASSERT(inp);
 440
 441 #if defined(IPSEC) || defined(FAST_IPSEC)
 442         if (inp->in6p_sp != NULL)
 443                 ipsec6_delete_pcbpolicy(inp);
 444 #endif /* IPSEC */
 445         inp->inp_gencnt = ++ipi->ipi_gencnt;
 446         in_pcbremlists(inp);
 447
 448         if (so) {
 449                 ACCEPT_LOCK();
 450                 SOCK_LOCK(so);
 451                 so->so_pcb = NULL;
 452                 sotryfree(so);
 453         }
 454
 455         ip6_freepcbopts(inp->in6p_outputopts);
 456         ip6_freemoptions(inp->in6p_moptions);
 457         /* Check and free IPv4 related resources in case of mapped addr */
 458         if (inp->inp_options)
 459                 (void)m_free(inp->inp_options);
 460         ip_freemoptions(inp->inp_moptions);
 461         inp->inp_vflag = 0;
 462 #ifdef MAC
 463         mac_destroy_inpcb(inp);
 464 #endif
 465         INP_UNLOCK(inp);
 466         uma_zfree(ipi->ipi_zone, inp);
 467 }
 468
 469 struct sockaddr *
 470 in6_sockaddr(port, addr_p)
 471         in_port_t port;
 472         struct in6_addr *addr_p;
 473 {
 474         struct sockaddr_in6 *sin6;
 475
 476         MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
 477         bzero(sin6, sizeof *sin6);
 478         sin6->sin6_family = AF_INET6;
 479         sin6->sin6_len = sizeof(*sin6);
 480         sin6->sin6_port = port;
 481         sin6->sin6_addr = *addr_p;
 482         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
 483
 484         return (struct sockaddr *)sin6;
 485 }
 486
 487 struct sockaddr *
 488 in6_v4mapsin6_sockaddr(port, addr_p)
 489         in_port_t port;
 490         struct in_addr *addr_p;
 491 {
 492         struct sockaddr_in sin;
 493         struct sockaddr_in6 *sin6_p;
 494
 495         bzero(&sin, sizeof sin);
 496         sin.sin_family = AF_INET;
 497         sin.sin_len = sizeof(sin);
 498         sin.sin_port = port;
 499         sin.sin_addr = *addr_p;
 500
 501         MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
 502                 M_WAITOK);
 503         in6_sin_2_v4mapsin6(&sin, sin6_p);
 504
 505         return (struct sockaddr *)sin6_p;
 506 }
 507
 508 /*
 509  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 510  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 511  * in struct pr_usrreqs, so that protocols can just reference then directly
 512  * without the need for a wrapper function.  The socket must have a valid
 513  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 514  * except through a kernel programming error, so it is acceptable to panic
 515  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 516  * because there actually /is/ a programming error somewhere... XXX)
 517  */
 518 int
 519 in6_setsockaddr(so, nam)
 520         struct socket *so;
 521         struct sockaddr **nam;
 522 {
 523         int s;
 524         register struct inpcb *inp;
 525         struct in6_addr addr;
 526         in_port_t port;
 527
 528         s = splnet();
 529         inp = sotoinpcb(so);
 530         if (!inp) {
 531                 splx(s);
 532                 return EINVAL;
 533         }
 534         port = inp->inp_lport;
 535         addr = inp->in6p_laddr;
 536         splx(s);
 537
 538         *nam = in6_sockaddr(port, &addr);
 539         return 0;
 540 }
 541
 542 int
 543 in6_setpeeraddr(so, nam)
 544         struct socket *so;
 545         struct sockaddr **nam;
 546 {
 547         int s;
 548         struct inpcb *inp;
 549         struct in6_addr addr;
 550         in_port_t port;
 551
 552         s = splnet();
 553         inp = sotoinpcb(so);
 554         if (!inp) {
 555                 splx(s);
 556                 return EINVAL;
 557         }
 558         port = inp->inp_fport;
 559         addr = inp->in6p_faddr;
 560         splx(s);
 561
 562         *nam = in6_sockaddr(port, &addr);
 563         return 0;
 564 }
 565
 566 int
 567 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 568 {
 569         struct  inpcb *inp = sotoinpcb(so);
 570         int     error;
 571
 572         if (inp == NULL)
 573                 return EINVAL;
 574         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 575                 error = in_setsockaddr(so, nam, &tcbinfo);
 576                 if (error == 0)
 577                         in6_sin_2_v4mapsin6_in_sock(nam);
 578         } else {
 579                 /* scope issues will be handled in in6_setsockaddr(). */
 580                 error = in6_setsockaddr(so, nam);
 581         }
 582
 583         return error;
 584 }
 585
 586 int
 587 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 588 {
 589         struct  inpcb *inp = sotoinpcb(so);
 590         int     error;
 591
 592         if (inp == NULL)
 593                 return EINVAL;
 594         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 595                 error = in_setpeeraddr(so, nam, &tcbinfo);
 596                 if (error == 0)
 597                         in6_sin_2_v4mapsin6_in_sock(nam);
 598         } else
 599         /* scope issues will be handled in in6_setpeeraddr(). */
 600         error = in6_setpeeraddr(so, nam);
 601
 602         return error;
 603 }
 604
 605 /*
 606  * Pass some notification to all connections of a protocol
 607  * associated with address dst.  The local address and/or port numbers
 608  * may be specified to limit the search.  The "usual action" will be
 609  * taken, depending on the ctlinput cmd.  The caller must filter any
 610  * cmds that are uninteresting (e.g., no error in the map).
 611  * Call the protocol specific routine (if any) to report
 612  * any errors for each matching socket.
 613  *
 614  * Must be called at splnet.
 615  */
 616 void
 617 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify)
 618         struct inpcbinfo *pcbinfo;
 619         struct sockaddr *dst;
 620         const struct sockaddr *src;
 621         u_int fport_arg, lport_arg;
 622         int cmd;
 623         void *cmdarg;
 624         struct inpcb *(*notify) __P((struct inpcb *, int));
 625 {
 626         struct inpcbhead *head;
 627         struct inpcb *inp, *ninp;
 628         struct sockaddr_in6 sa6_src, *sa6_dst;
 629         u_short fport = fport_arg, lport = lport_arg;
 630         u_int32_t flowinfo;
 631         int errno, s;
 632
 633         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 634                 return;
 635
 636         sa6_dst = (struct sockaddr_in6 *)dst;
 637         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 638                 return;
 639
 640         /*
 641          * note that src can be NULL when we get notify by local fragmentation.
 642          */
 643         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 644         flowinfo = sa6_src.sin6_flowinfo;
 645
 646         /*
 647          * Redirects go to all references to the destination,
 648          * and use in6_rtchange to invalidate the route cache.
 649          * Dead host indications: also use in6_rtchange to invalidate
 650          * the cache, and deliver the error to all the sockets.
 651          * Otherwise, if we have knowledge of the local port and address,
 652          * deliver only to that socket.
 653          */
 654         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 655                 fport = 0;
 656                 lport = 0;
 657                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 658
 659                 if (cmd != PRC_HOSTDEAD)
 660                         notify = in6_rtchange;
 661         }
 662         errno = inet6ctlerrmap[cmd];
 663         s = splnet();
 664         head = pcbinfo->listhead;
 665         INP_INFO_WLOCK(pcbinfo);
 666         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 667                 INP_LOCK(inp);
 668                 ninp = LIST_NEXT(inp, inp_list);
 669
 670                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 671                         INP_UNLOCK(inp);
 672                         continue;
 673                 }
 674
 675                 /*
 676                  * If the error designates a new path MTU for a destination
 677                  * and the application (associated with this socket) wanted to
 678                  * know the value, notify. Note that we notify for all
 679                  * disconnected sockets if the corresponding application
 680                  * wanted. This is because some UDP applications keep sending
 681                  * sockets disconnected.
 682                  * XXX: should we avoid to notify the value to TCP sockets?
 683                  */
 684                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 685                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 686                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 687                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
 688                                         (u_int32_t *)cmdarg);
 689                 }
 690
 691                 /*
 692                  * Detect if we should notify the error. If no source and
 693                  * destination ports are specifed, but non-zero flowinfo and
 694                  * local address match, notify the error. This is the case
 695                  * when the error is delivered with an encrypted buffer
 696                  * by ESP. Otherwise, just compare addresses and ports
 697                  * as usual.
 698                  */
 699                 if (lport == 0 && fport == 0 && flowinfo &&
 700                     inp->inp_socket != NULL &&
 701                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 702                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 703                         goto do_notify;
 704                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 705                                              &sa6_dst->sin6_addr) ||
 706                          inp->inp_socket == 0 ||
 707                          (lport && inp->inp_lport != lport) ||
 708                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 709                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 710                                               &sa6_src.sin6_addr)) ||
 711                          (fport && inp->inp_fport != fport)) {
 712                         INP_UNLOCK(inp);
 713                         continue;
 714                 }
 715
 716           do_notify:
 717                 if (notify) {
 718                         if ((*notify)(inp, errno))
 719                                 INP_UNLOCK(inp);
 720                 } else
 721                         INP_UNLOCK(inp);
 722         }
 723         INP_INFO_WUNLOCK(pcbinfo);
 724         splx(s);
 725 }
 726
 727 /*
 728  * Lookup a PCB based on the local address and port.
 729  */
 730 struct inpcb *
 731 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 732         struct inpcbinfo *pcbinfo;
 733         struct in6_addr *laddr;
 734         u_int lport_arg;
 735         int wild_okay;
 736 {
 737         register struct inpcb *inp;
 738         int matchwild = 3, wildcard;
 739         u_short lport = lport_arg;
 740
 741         if (!wild_okay) {
 742                 struct inpcbhead *head;
 743                 /*
 744                  * Look for an unconnected (wildcard foreign addr) PCB that
 745                  * matches the local address and port we're looking for.
 746                  */
 747                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 748                                                       pcbinfo->hashmask)];
 749                 LIST_FOREACH(inp, head, inp_hash) {
 750                         if ((inp->inp_vflag & INP_IPV6) == 0)
 751                                 continue;
 752                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 753                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 754                             inp->inp_lport == lport) {
 755                                 /*
 756                                  * Found.
 757                                  */
 758                                 return (inp);
 759                         }
 760                 }
 761                 /*
 762                  * Not found.
 763                  */
 764                 return (NULL);
 765         } else {
 766                 struct inpcbporthead *porthash;
 767                 struct inpcbport *phd;
 768                 struct inpcb *match = NULL;
 769                 /*
 770                  * Best fit PCB lookup.
 771                  *
 772                  * First see if this local port is in use by looking on the
 773                  * port hash list.
 774                  */
 775                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 776                     pcbinfo->porthashmask)];
 777                 LIST_FOREACH(phd, porthash, phd_hash) {
 778                         if (phd->phd_port == lport)
 779                                 break;
 780                 }
 781                 if (phd != NULL) {
 782                         /*
 783                          * Port is in use by one or more PCBs. Look for best
 784                          * fit.
 785                          */
 786                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 787                                 wildcard = 0;
 788                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 789                                         continue;
 790                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 791                                         wildcard++;
 792                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 793                                         &inp->in6p_laddr)) {
 794                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 795                                                 wildcard++;
 796                                         else if (!IN6_ARE_ADDR_EQUAL(
 797                                                 &inp->in6p_laddr, laddr))
 798                                                 continue;
 799                                 } else {
 800                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 801                                                 wildcard++;
 802                                 }
 803                                 if (wildcard < matchwild) {
 804                                         match = inp;
 805                                         matchwild = wildcard;
 806                                         if (matchwild == 0) {
 807                                                 break;
 808                                         }
 809                                 }
 810                         }
 811                 }
 812                 return (match);
 813         }
 814 }
 815
 816 void
 817 in6_pcbpurgeif0(head, ifp)
 818         struct in6pcb *head;
 819         struct ifnet *ifp;
 820 {
 821         struct in6pcb *in6p;
 822         struct ip6_moptions *im6o;
 823         struct in6_multi_mship *imm, *nimm;
 824
 825         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
 826                 im6o = in6p->in6p_moptions;
 827                 if ((in6p->inp_vflag & INP_IPV6) &&
 828                     im6o) {
 829                         /*
 830                          * Unselect the outgoing interface if it is being
 831                          * detached.
 832                          */
 833                         if (im6o->im6o_multicast_ifp == ifp)
 834                                 im6o->im6o_multicast_ifp = NULL;
 835
 836                         /*
 837                          * Drop multicast group membership if we joined
 838                          * through the interface being detached.
 839                          * XXX controversial - is it really legal for kernel
 840                          * to force this?
 841                          */
 842                         for (imm = im6o->im6o_memberships.lh_first;
 843                              imm != NULL; imm = nimm) {
 844                                 nimm = imm->i6mm_chain.le_next;
 845                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 846                                         LIST_REMOVE(imm, i6mm_chain);
 847                                         in6_delmulti(imm->i6mm_maddr);
 848                                         free(imm, M_IP6MADDR);
 849                                 }
 850                         }
 851                 }
 852         }
 853 }
 854
 855 /*
 856  * Check for alternatives when higher level complains
 857  * about service problems.  For now, invalidate cached
 858  * routing information.  If the route was created dynamically
 859  * (by a redirect), time to try a default gateway again.
 860  */
 861 void
 862 in6_losing(in6p)
 863         struct inpcb *in6p;
 864 {
 865         /*
 866          * We don't store route pointers in the routing table anymore
 867          */
 868         return;
 869 }
 870
 871 /*
 872  * After a routing change, flush old routing
 873  * and allocate a (hopefully) better one.
 874  */
 875 struct inpcb *
 876 in6_rtchange(inp, errno)
 877         struct inpcb *inp;
 878         int errno;
 879 {
 880         /*
 881          * We don't store route pointers in the routing table anymore
 882          */
 883         return inp;
 884 }
 885
 886 /*
 887  * Lookup PCB in hash list.
 888  */
 889 struct inpcb *
 890 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
 891         struct inpcbinfo *pcbinfo;
 892         struct in6_addr *faddr, *laddr;
 893         u_int fport_arg, lport_arg;
 894         int wildcard;
 895         struct ifnet *ifp;
 896 {
 897         struct inpcbhead *head;
 898         register struct inpcb *inp;
 899         u_short fport = fport_arg, lport = lport_arg;
 900         int faith;
 901
 902         if (faithprefix_p != NULL)
 903                 faith = (*faithprefix_p)(laddr);
 904         else
 905                 faith = 0;
 906
 907         /*
 908          * First look for an exact match.
 909          */
 910         head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */,
 911                                               lport, fport,
 912                                               pcbinfo->hashmask)];
 913         LIST_FOREACH(inp, head, inp_hash) {
 914                 if ((inp->inp_vflag & INP_IPV6) == 0)
 915                         continue;
 916                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 917                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 918                     inp->inp_fport == fport &&
 919                     inp->inp_lport == lport) {
 920                         /*
 921                          * Found.
 922                          */
 923                         return (inp);
 924                 }
 925         }
 926         if (wildcard) {
 927                 struct inpcb *local_wild = NULL;
 928
 929                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 930                                                       pcbinfo->hashmask)];
 931                 LIST_FOREACH(inp, head, inp_hash) {
 932                         if ((inp->inp_vflag & INP_IPV6) == 0)
 933                                 continue;
 934                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 935                             inp->inp_lport == lport) {
 936                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
 937                                         continue;
 938                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 939                                                        laddr))
 940                                         return (inp);
 941                                 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 942                                         local_wild = inp;
 943                         }
 944                 }
 945                 return (local_wild);
 946         }
 947
 948         /*
 949          * Not found.
 950          */
 951         return (NULL);
 952 }
 953
 954 void
 955 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
 956 {
 957         struct ip6_hdr *ip;
 958
 959         ip = mtod(m, struct ip6_hdr *);
 960         bzero(sin6, sizeof(*sin6));
 961         sin6->sin6_len = sizeof(*sin6);
 962         sin6->sin6_family = AF_INET6;
 963         sin6->sin6_addr = ip->ip6_src;
 964
 965         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
 966
 967         return;
 968 }