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) <= ipport_reservedhigh &&
 192                             ntohs(lport) >= ipport_reservedlow &&
 193                             suser_cred(cred, SUSER_ALLOWJAIL))
 194                                 return (EACCES);
 195                         if (so->so_cred->cr_uid != 0 &&
 196                             !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 197                                 t = in6_pcblookup_local(pcbinfo,
 198                                     &sin6->sin6_addr, lport,
 199                                     INPLOOKUP_WILDCARD);
 200                                 if (t &&
 201                                     ((t->inp_vflag & INP_TIMEWAIT) == 0) &&
 202                                     (so->so_type != SOCK_STREAM ||
 203                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
 204                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 205                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 206                                      (t->inp_socket->so_options & SO_REUSEPORT)
 207                                       == 0) && (so->so_cred->cr_uid !=
 208                                      t->inp_socket->so_cred->cr_uid))
 209                                         return (EADDRINUSE);
 210                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 211                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 212                                         struct sockaddr_in sin;
 213
 214                                         in6_sin6_2_sin(&sin, sin6);
 215                                         t = in_pcblookup_local(pcbinfo,
 216                                                 sin.sin_addr, lport,
 217                                                 INPLOOKUP_WILDCARD);
 218                                         if (t &&
 219                                             ((t->inp_vflag &
 220                                               INP_TIMEWAIT) == 0) &&
 221                                             (so->so_type != SOCK_STREAM ||
 222                                              ntohl(t->inp_faddr.s_addr) ==
 223                                               INADDR_ANY) &&
 224                                             (so->so_cred->cr_uid !=
 225                                              t->inp_socket->so_cred->cr_uid))
 226                                                 return (EADDRINUSE);
 227                                 }
 228                         }
 229                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 230                                                 lport, wild);
 231                         if (t && (reuseport & ((t->inp_vflag & INP_TIMEWAIT) ?
 232                             intotw(t)->tw_so_options :
 233                             t->inp_socket->so_options)) == 0)
 234                                 return (EADDRINUSE);
 235                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 236                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 237                                 struct sockaddr_in sin;
 238
 239                                 in6_sin6_2_sin(&sin, sin6);
 240                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 241                                                        lport, wild);
 242                                 if (t && t->inp_vflag & INP_TIMEWAIT) {
 243                                         if ((reuseport &
 244                                             intotw(t)->tw_so_options) == 0 &&
 245                                             (ntohl(t->inp_laddr.s_addr) !=
 246                                              INADDR_ANY || ((inp->inp_vflag &
 247                                              INP_IPV6PROTO) ==
 248                                              (t->inp_vflag & INP_IPV6PROTO))))
 249                                                 return (EADDRINUSE);
 250                                 }
 251                                 else if (t &&
 252                                     (reuseport & t->inp_socket->so_options)
 253                                     == 0 && (ntohl(t->inp_laddr.s_addr) !=
 254                                     INADDR_ANY || INP_SOCKAF(so) ==
 255                                      INP_SOCKAF(t->inp_socket)))
 256                                         return (EADDRINUSE);
 257                         }
 258                 }
 259                 inp->in6p_laddr = sin6->sin6_addr;
 260         }
 261         if (lport == 0) {
 262                 int e;
 263                 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0)
 264                         return (e);
 265         }
 266         else {
 267                 inp->inp_lport = lport;
 268                 if (in_pcbinshash(inp) != 0) {
 269                         inp->in6p_laddr = in6addr_any;
 270                         inp->inp_lport = 0;
 271                         return (EAGAIN);
 272                 }
 273         }
 274         return (0);
 275 }
 276
 277 /*
 278  *   Transform old in6_pcbconnect() into an inner subroutine for new
 279  *   in6_pcbconnect(): Do some validity-checking on the remote
 280  *   address (in mbuf 'nam') and then determine local host address
 281  *   (i.e., which interface) to use to access that remote host.
 282  *
 283  *   This preserves definition of in6_pcbconnect(), while supporting a
 284  *   slightly different version for T/TCP.  (This is more than
 285  *   a bit of a kludge, but cleaning up the internal interfaces would
 286  *   have forced minor changes in every protocol).
 287  */
 288
 289 int
 290 in6_pcbladdr(inp, nam, plocal_addr6)
 291         register struct inpcb *inp;
 292         struct sockaddr *nam;
 293         struct in6_addr **plocal_addr6;
 294 {
 295         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 296         int error = 0;
 297         struct ifnet *ifp = NULL;
 298         int scope_ambiguous = 0;
 299
 300         if (nam->sa_len != sizeof (*sin6))
 301                 return (EINVAL);
 302         if (sin6->sin6_family != AF_INET6)
 303                 return (EAFNOSUPPORT);
 304         if (sin6->sin6_port == 0)
 305                 return (EADDRNOTAVAIL);
 306
 307         if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
 308                 scope_ambiguous = 1;
 309         if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
 310                 return(error);
 311
 312         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 313         INP_LOCK_ASSERT(inp);
 314
 315         if (in6_ifaddr) {
 316                 /*
 317                  * If the destination address is UNSPECIFIED addr,
 318                  * use the loopback addr, e.g ::1.
 319                  */
 320                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 321                         sin6->sin6_addr = in6addr_loopback;
 322         }
 323
 324         /*
 325          * XXX: in6_selectsrc might replace the bound local address
 326          * with the address specified by setsockopt(IPV6_PKTINFO).
 327          * Is it the intended behavior?
 328          */
 329         *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
 330                                       inp->in6p_moptions, NULL,
 331                                       &inp->in6p_laddr, &ifp, &error);
 332         if (ifp && scope_ambiguous &&
 333             (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
 334                 return(error);
 335         }
 336
 337         if (*plocal_addr6 == 0) {
 338                 if (error == 0)
 339                         error = EADDRNOTAVAIL;
 340                 return (error);
 341         }
 342         /*
 343          * Don't do pcblookup call here; return interface in
 344          * plocal_addr6
 345          * and exit to caller, that will do the lookup.
 346          */
 347
 348         return (0);
 349 }
 350
 351 /*
 352  * Outer subroutine:
 353  * Connect from a socket to a specified address.
 354  * Both address and port must be specified in argument sin.
 355  * If don't have a local address for this socket yet,
 356  * then pick one.
 357  */
 358 int
 359 in6_pcbconnect(inp, nam, cred)
 360         register struct inpcb *inp;
 361         struct sockaddr *nam;
 362         struct ucred *cred;
 363 {
 364         struct in6_addr *addr6;
 365         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 366         int error;
 367
 368         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 369         INP_LOCK_ASSERT(inp);
 370
 371         /*
 372          * Call inner routine, to assign local interface address.
 373          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 374          */
 375         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 376                 return (error);
 377
 378         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
 379                                sin6->sin6_port,
 380                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 381                               ? addr6 : &inp->in6p_laddr,
 382                               inp->inp_lport, 0, NULL) != NULL) {
 383                 return (EADDRINUSE);
 384         }
 385         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 386                 if (inp->inp_lport == 0) {
 387                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
 388                         if (error)
 389                                 return (error);
 390                 }
 391                 inp->in6p_laddr = *addr6;
 392         }
 393         inp->in6p_faddr = sin6->sin6_addr;
 394         inp->inp_fport = sin6->sin6_port;
 395         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 396         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 397         if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
 398                 inp->in6p_flowinfo |=
 399                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 400
 401         in_pcbrehash(inp);
 402 #ifdef IPSEC
 403         if (inp->inp_socket->so_type == SOCK_STREAM)
 404                 ipsec_pcbconn(inp->inp_sp);
 405 #endif
 406         return (0);
 407 }
 408
 409 void
 410 in6_pcbdisconnect(inp)
 411         struct inpcb *inp;
 412 {
 413
 414         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 415         INP_LOCK_ASSERT(inp);
 416
 417         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 418         inp->inp_fport = 0;
 419         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 420         inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
 421         in_pcbrehash(inp);
 422 #ifdef IPSEC
 423         ipsec_pcbdisconn(inp->inp_sp);
 424 #endif
 425 }
 426
 427 void
 428 in6_pcbdetach(struct inpcb *inp)
 429 {
 430
 431         KASSERT(inp->inp_socket != NULL, ("in6_pcbdetach: inp_socket == NULL"));
 432         inp->inp_socket->so_pcb = NULL;
 433         inp->inp_socket = NULL;
 434 }
 435
 436 void
 437 in6_pcbfree(struct inpcb *inp)
 438 {
 439         struct inpcbinfo *ipi = inp->inp_pcbinfo;
 440
 441         KASSERT(inp->inp_socket == NULL, ("in6_pcbfree: inp_socket != NULL"));
 442         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
 443         INP_LOCK_ASSERT(inp);
 444
 445 #if defined(IPSEC) || defined(FAST_IPSEC)
 446         if (inp->in6p_sp != NULL)
 447                 ipsec6_delete_pcbpolicy(inp);
 448 #endif /* IPSEC */
 449         inp->inp_gencnt = ++ipi->ipi_gencnt;
 450         in_pcbremlists(inp);
 451         ip6_freepcbopts(inp->in6p_outputopts);
 452         ip6_freemoptions(inp->in6p_moptions);
 453         /* Check and free IPv4 related resources in case of mapped addr */
 454         if (inp->inp_options)
 455                 (void)m_free(inp->inp_options);
 456         ip_freemoptions(inp->inp_moptions);
 457         inp->inp_vflag = 0;
 458         INP_LOCK_DESTROY(inp);
 459         uma_zfree(ipi->ipi_zone, inp);
 460 }
 461
 462 struct sockaddr *
 463 in6_sockaddr(port, addr_p)
 464         in_port_t port;
 465         struct in6_addr *addr_p;
 466 {
 467         struct sockaddr_in6 *sin6;
 468
 469         MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
 470         bzero(sin6, sizeof *sin6);
 471         sin6->sin6_family = AF_INET6;
 472         sin6->sin6_len = sizeof(*sin6);
 473         sin6->sin6_port = port;
 474         sin6->sin6_addr = *addr_p;
 475         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
 476
 477         return (struct sockaddr *)sin6;
 478 }
 479
 480 struct sockaddr *
 481 in6_v4mapsin6_sockaddr(port, addr_p)
 482         in_port_t port;
 483         struct in_addr *addr_p;
 484 {
 485         struct sockaddr_in sin;
 486         struct sockaddr_in6 *sin6_p;
 487
 488         bzero(&sin, sizeof sin);
 489         sin.sin_family = AF_INET;
 490         sin.sin_len = sizeof(sin);
 491         sin.sin_port = port;
 492         sin.sin_addr = *addr_p;
 493
 494         MALLOC(sin6_p, struct sockaddr_in6 *, sizeof *sin6_p, M_SONAME,
 495                 M_WAITOK);
 496         in6_sin_2_v4mapsin6(&sin, sin6_p);
 497
 498         return (struct sockaddr *)sin6_p;
 499 }
 500
 501 /*
 502  * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
 503  * modified to match the pru_sockaddr() and pru_peeraddr() entry points
 504  * in struct pr_usrreqs, so that protocols can just reference then directly
 505  * without the need for a wrapper function.  The socket must have a valid
 506  * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
 507  * except through a kernel programming error, so it is acceptable to panic
 508  * (or in this case trap) if the PCB is invalid.  (Actually, we don't trap
 509  * because there actually /is/ a programming error somewhere... XXX)
 510  */
 511 int
 512 in6_setsockaddr(so, nam)
 513         struct socket *so;
 514         struct sockaddr **nam;
 515 {
 516         register struct inpcb *inp;
 517         struct in6_addr addr;
 518         in_port_t port;
 519
 520         inp = sotoinpcb(so);
 521         KASSERT(inp != NULL, ("in6_setsockaddr: inp == NULL"));
 522
 523         port = inp->inp_lport;
 524         addr = inp->in6p_laddr;
 525
 526         *nam = in6_sockaddr(port, &addr);
 527         return 0;
 528 }
 529
 530 int
 531 in6_setpeeraddr(so, nam)
 532         struct socket *so;
 533         struct sockaddr **nam;
 534 {
 535         struct inpcb *inp;
 536         struct in6_addr addr;
 537         in_port_t port;
 538
 539         inp = sotoinpcb(so);
 540         KASSERT(inp != NULL, ("in6_setpeeraddr: inp == NULL"));
 541
 542         port = inp->inp_fport;
 543         addr = inp->in6p_faddr;
 544
 545         *nam = in6_sockaddr(port, &addr);
 546         return 0;
 547 }
 548
 549 int
 550 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 551 {
 552         struct  inpcb *inp;
 553         int     error;
 554
 555         inp = sotoinpcb(so);
 556         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
 557
 558         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 559                 error = in_setsockaddr(so, nam, &tcbinfo);
 560                 if (error == 0)
 561                         in6_sin_2_v4mapsin6_in_sock(nam);
 562         } else {
 563                 /* scope issues will be handled in in6_setsockaddr(). */
 564                 error = in6_setsockaddr(so, nam);
 565         }
 566
 567         return error;
 568 }
 569
 570 int
 571 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 572 {
 573         struct  inpcb *inp;
 574         int     error;
 575
 576         inp = sotoinpcb(so);
 577         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
 578
 579         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 580                 error = in_setpeeraddr(so, nam, &tcbinfo);
 581                 if (error == 0)
 582                         in6_sin_2_v4mapsin6_in_sock(nam);
 583         } else
 584         /* scope issues will be handled in in6_setpeeraddr(). */
 585         error = in6_setpeeraddr(so, nam);
 586
 587         return error;
 588 }
 589
 590 /*
 591  * Pass some notification to all connections of a protocol
 592  * associated with address dst.  The local address and/or port numbers
 593  * may be specified to limit the search.  The "usual action" will be
 594  * taken, depending on the ctlinput cmd.  The caller must filter any
 595  * cmds that are uninteresting (e.g., no error in the map).
 596  * Call the protocol specific routine (if any) to report
 597  * any errors for each matching socket.
 598  */
 599 void
 600 in6_pcbnotify(pcbinfo, dst, fport_arg, src, lport_arg, cmd, cmdarg, notify)
 601         struct inpcbinfo *pcbinfo;
 602         struct sockaddr *dst;
 603         const struct sockaddr *src;
 604         u_int fport_arg, lport_arg;
 605         int cmd;
 606         void *cmdarg;
 607         struct inpcb *(*notify) __P((struct inpcb *, int));
 608 {
 609         struct inpcbhead *head;
 610         struct inpcb *inp, *ninp;
 611         struct sockaddr_in6 sa6_src, *sa6_dst;
 612         u_short fport = fport_arg, lport = lport_arg;
 613         u_int32_t flowinfo;
 614         int errno;
 615
 616         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 617                 return;
 618
 619         sa6_dst = (struct sockaddr_in6 *)dst;
 620         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 621                 return;
 622
 623         /*
 624          * note that src can be NULL when we get notify by local fragmentation.
 625          */
 626         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 627         flowinfo = sa6_src.sin6_flowinfo;
 628
 629         /*
 630          * Redirects go to all references to the destination,
 631          * and use in6_rtchange to invalidate the route cache.
 632          * Dead host indications: also use in6_rtchange to invalidate
 633          * the cache, and deliver the error to all the sockets.
 634          * Otherwise, if we have knowledge of the local port and address,
 635          * deliver only to that socket.
 636          */
 637         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 638                 fport = 0;
 639                 lport = 0;
 640                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 641
 642                 if (cmd != PRC_HOSTDEAD)
 643                         notify = in6_rtchange;
 644         }
 645         errno = inet6ctlerrmap[cmd];
 646         head = pcbinfo->listhead;
 647         INP_INFO_WLOCK(pcbinfo);
 648         for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
 649                 INP_LOCK(inp);
 650                 ninp = LIST_NEXT(inp, inp_list);
 651
 652                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 653                         INP_UNLOCK(inp);
 654                         continue;
 655                 }
 656
 657                 /*
 658                  * If the error designates a new path MTU for a destination
 659                  * and the application (associated with this socket) wanted to
 660                  * know the value, notify. Note that we notify for all
 661                  * disconnected sockets if the corresponding application
 662                  * wanted. This is because some UDP applications keep sending
 663                  * sockets disconnected.
 664                  * XXX: should we avoid to notify the value to TCP sockets?
 665                  */
 666                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 667                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 668                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 669                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
 670                                         (u_int32_t *)cmdarg);
 671                 }
 672
 673                 /*
 674                  * Detect if we should notify the error. If no source and
 675                  * destination ports are specifed, but non-zero flowinfo and
 676                  * local address match, notify the error. This is the case
 677                  * when the error is delivered with an encrypted buffer
 678                  * by ESP. Otherwise, just compare addresses and ports
 679                  * as usual.
 680                  */
 681                 if (lport == 0 && fport == 0 && flowinfo &&
 682                     inp->inp_socket != NULL &&
 683                     flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
 684                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 685                         goto do_notify;
 686                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 687                                              &sa6_dst->sin6_addr) ||
 688                          inp->inp_socket == 0 ||
 689                          (lport && inp->inp_lport != lport) ||
 690                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 691                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 692                                               &sa6_src.sin6_addr)) ||
 693                          (fport && inp->inp_fport != fport)) {
 694                         INP_UNLOCK(inp);
 695                         continue;
 696                 }
 697
 698           do_notify:
 699                 if (notify) {
 700                         if ((*notify)(inp, errno))
 701                                 INP_UNLOCK(inp);
 702                 } else
 703                         INP_UNLOCK(inp);
 704         }
 705         INP_INFO_WUNLOCK(pcbinfo);
 706 }
 707
 708 /*
 709  * Lookup a PCB based on the local address and port.
 710  */
 711 struct inpcb *
 712 in6_pcblookup_local(pcbinfo, laddr, lport_arg, wild_okay)
 713         struct inpcbinfo *pcbinfo;
 714         struct in6_addr *laddr;
 715         u_int lport_arg;
 716         int wild_okay;
 717 {
 718         register struct inpcb *inp;
 719         int matchwild = 3, wildcard;
 720         u_short lport = lport_arg;
 721
 722         if (!wild_okay) {
 723                 struct inpcbhead *head;
 724                 /*
 725                  * Look for an unconnected (wildcard foreign addr) PCB that
 726                  * matches the local address and port we're looking for.
 727                  */
 728                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 729                                                       pcbinfo->hashmask)];
 730                 LIST_FOREACH(inp, head, inp_hash) {
 731                         if ((inp->inp_vflag & INP_IPV6) == 0)
 732                                 continue;
 733                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 734                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 735                             inp->inp_lport == lport) {
 736                                 /*
 737                                  * Found.
 738                                  */
 739                                 return (inp);
 740                         }
 741                 }
 742                 /*
 743                  * Not found.
 744                  */
 745                 return (NULL);
 746         } else {
 747                 struct inpcbporthead *porthash;
 748                 struct inpcbport *phd;
 749                 struct inpcb *match = NULL;
 750                 /*
 751                  * Best fit PCB lookup.
 752                  *
 753                  * First see if this local port is in use by looking on the
 754                  * port hash list.
 755                  */
 756                 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
 757                     pcbinfo->porthashmask)];
 758                 LIST_FOREACH(phd, porthash, phd_hash) {
 759                         if (phd->phd_port == lport)
 760                                 break;
 761                 }
 762                 if (phd != NULL) {
 763                         /*
 764                          * Port is in use by one or more PCBs. Look for best
 765                          * fit.
 766                          */
 767                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 768                                 wildcard = 0;
 769                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 770                                         continue;
 771                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 772                                         wildcard++;
 773                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 774                                         &inp->in6p_laddr)) {
 775                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 776                                                 wildcard++;
 777                                         else if (!IN6_ARE_ADDR_EQUAL(
 778                                                 &inp->in6p_laddr, laddr))
 779                                                 continue;
 780                                 } else {
 781                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 782                                                 wildcard++;
 783                                 }
 784                                 if (wildcard < matchwild) {
 785                                         match = inp;
 786                                         matchwild = wildcard;
 787                                         if (matchwild == 0) {
 788                                                 break;
 789                                         }
 790                                 }
 791                         }
 792                 }
 793                 return (match);
 794         }
 795 }
 796
 797 void
 798 in6_pcbpurgeif0(head, ifp)
 799         struct in6pcb *head;
 800         struct ifnet *ifp;
 801 {
 802         struct in6pcb *in6p;
 803         struct ip6_moptions *im6o;
 804         struct in6_multi_mship *imm, *nimm;
 805
 806         for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
 807                 im6o = in6p->in6p_moptions;
 808                 if ((in6p->inp_vflag & INP_IPV6) &&
 809                     im6o) {
 810                         /*
 811                          * Unselect the outgoing interface if it is being
 812                          * detached.
 813                          */
 814                         if (im6o->im6o_multicast_ifp == ifp)
 815                                 im6o->im6o_multicast_ifp = NULL;
 816
 817                         /*
 818                          * Drop multicast group membership if we joined
 819                          * through the interface being detached.
 820                          * XXX controversial - is it really legal for kernel
 821                          * to force this?
 822                          */
 823                         for (imm = im6o->im6o_memberships.lh_first;
 824                              imm != NULL; imm = nimm) {
 825                                 nimm = imm->i6mm_chain.le_next;
 826                                 if (imm->i6mm_maddr->in6m_ifp == ifp) {
 827                                         LIST_REMOVE(imm, i6mm_chain);
 828                                         in6_delmulti(imm->i6mm_maddr);
 829                                         free(imm, M_IP6MADDR);
 830                                 }
 831                         }
 832                 }
 833         }
 834 }
 835
 836 /*
 837  * Check for alternatives when higher level complains
 838  * about service problems.  For now, invalidate cached
 839  * routing information.  If the route was created dynamically
 840  * (by a redirect), time to try a default gateway again.
 841  */
 842 void
 843 in6_losing(in6p)
 844         struct inpcb *in6p;
 845 {
 846         /*
 847          * We don't store route pointers in the routing table anymore
 848          */
 849         return;
 850 }
 851
 852 /*
 853  * After a routing change, flush old routing
 854  * and allocate a (hopefully) better one.
 855  */
 856 struct inpcb *
 857 in6_rtchange(inp, errno)
 858         struct inpcb *inp;
 859         int errno;
 860 {
 861         /*
 862          * We don't store route pointers in the routing table anymore
 863          */
 864         return inp;
 865 }
 866
 867 /*
 868  * Lookup PCB in hash list.
 869  */
 870 struct inpcb *
 871 in6_pcblookup_hash(pcbinfo, faddr, fport_arg, laddr, lport_arg, wildcard, ifp)
 872         struct inpcbinfo *pcbinfo;
 873         struct in6_addr *faddr, *laddr;
 874         u_int fport_arg, lport_arg;
 875         int wildcard;
 876         struct ifnet *ifp;
 877 {
 878         struct inpcbhead *head;
 879         register struct inpcb *inp;
 880         u_short fport = fport_arg, lport = lport_arg;
 881         int faith;
 882
 883         if (faithprefix_p != NULL)
 884                 faith = (*faithprefix_p)(laddr);
 885         else
 886                 faith = 0;
 887
 888         /*
 889          * First look for an exact match.
 890          */
 891         head = &pcbinfo->hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */,
 892                                               lport, fport,
 893                                               pcbinfo->hashmask)];
 894         LIST_FOREACH(inp, head, inp_hash) {
 895                 if ((inp->inp_vflag & INP_IPV6) == 0)
 896                         continue;
 897                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 898                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 899                     inp->inp_fport == fport &&
 900                     inp->inp_lport == lport) {
 901                         /*
 902                          * Found.
 903                          */
 904                         return (inp);
 905                 }
 906         }
 907         if (wildcard) {
 908                 struct inpcb *local_wild = NULL;
 909
 910                 head = &pcbinfo->hashbase[INP_PCBHASH(INADDR_ANY, lport, 0,
 911                                                       pcbinfo->hashmask)];
 912                 LIST_FOREACH(inp, head, inp_hash) {
 913                         if ((inp->inp_vflag & INP_IPV6) == 0)
 914                                 continue;
 915                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 916                             inp->inp_lport == lport) {
 917                                 if (faith && (inp->inp_flags & INP_FAITH) == 0)
 918                                         continue;
 919                                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 920                                                        laddr))
 921                                         return (inp);
 922                                 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 923                                         local_wild = inp;
 924                         }
 925                 }
 926                 return (local_wild);
 927         }
 928
 929         /*
 930          * Not found.
 931          */
 932         return (NULL);
 933 }
 934
 935 void
 936 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
 937 {
 938         struct ip6_hdr *ip;
 939
 940         ip = mtod(m, struct ip6_hdr *);
 941         bzero(sin6, sizeof(*sin6));
 942         sin6->sin6_len = sizeof(*sin6);
 943         sin6->sin6_family = AF_INET6;
 944         sin6->sin6_addr = ip->ip6_src;
 945
 946         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
 947
 948         return;
 949 }