sys/netinet6/in6_pcb.c

   1 /*-
   2  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   3  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   4  * All rights reserved.
   5  *
   6  * Portions of this software were developed by Robert N. M. Watson under
   7  * contract to Juniper Networks, Inc.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the project nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
  34  */
  35
  36 /*-
  37  * Copyright (c) 1982, 1986, 1991, 1993
  38  *      The Regents of the University of California.  All rights reserved.
  39  *
  40  * Redistribution and use in source and binary forms, with or without
  41  * modification, are permitted provided that the following conditions
  42  * are met:
  43  * 1. Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  * 2. Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in the
  47  *    documentation and/or other materials provided with the distribution.
  48  * 4. Neither the name of the University nor the names of its contributors
  49  *    may be used to endorse or promote products derived from this software
  50  *    without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  53  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  54  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  56  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62  * SUCH DAMAGE.
  63  *
  64  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
  65  */
  66
  67 #include <sys/cdefs.h>
  68 __FBSDID("$FreeBSD$");
  69
  70 #include "opt_inet.h"
  71 #include "opt_inet6.h"
  72 #include "opt_ipsec.h"
  73 #include "opt_pcbgroup.h"
  74 #include "opt_rss.h"
  75
  76 #include <sys/param.h>
  77 #include <sys/systm.h>
  78 #include <sys/malloc.h>
  79 #include <sys/mbuf.h>
  80 #include <sys/domain.h>
  81 #include <sys/protosw.h>
  82 #include <sys/socket.h>
  83 #include <sys/socketvar.h>
  84 #include <sys/sockio.h>
  85 #include <sys/errno.h>
  86 #include <sys/time.h>
  87 #include <sys/priv.h>
  88 #include <sys/proc.h>
  89 #include <sys/jail.h>
  90
  91 #include <vm/uma.h>
  92
  93 #include <net/if.h>
  94 #include <net/if_var.h>
  95 #include <net/if_types.h>
  96 #include <net/route.h>
  97
  98 #include <netinet/in.h>
  99 #include <netinet/in_var.h>
 100 #include <netinet/in_systm.h>
 101 #include <netinet/tcp_var.h>
 102 #include <netinet/ip6.h>
 103 #include <netinet/ip_var.h>
 104
 105 #include <netinet6/ip6_var.h>
 106 #include <netinet6/nd6.h>
 107 #include <netinet/in_pcb.h>
 108 #include <netinet6/in6_pcb.h>
 109 #include <netinet6/scope6_var.h>
 110
 111 int
 112 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam,
 113     struct ucred *cred)
 114 {
 115         struct socket *so = inp->inp_socket;
 116         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 117         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 118         u_short lport = 0;
 119         int error, lookupflags = 0;
 120         int reuseport = (so->so_options & SO_REUSEPORT);
 121
 122         INP_WLOCK_ASSERT(inp);
 123         INP_HASH_WLOCK_ASSERT(pcbinfo);
 124
 125         if (TAILQ_EMPTY(&V_in6_ifaddrhead))     /* XXX broken! */
 126                 return (EADDRNOTAVAIL);
 127         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 128                 return (EINVAL);
 129         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 130                 lookupflags = INPLOOKUP_WILDCARD;
 131         if (nam == NULL) {
 132                 if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
 133                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
 134                         return (error);
 135         } else {
 136                 sin6 = (struct sockaddr_in6 *)nam;
 137                 if (nam->sa_len != sizeof(*sin6))
 138                         return (EINVAL);
 139                 /*
 140                  * family check.
 141                  */
 142                 if (nam->sa_family != AF_INET6)
 143                         return (EAFNOSUPPORT);
 144
 145                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 146                         return(error);
 147
 148                 if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
 149                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
 150                         return (error);
 151
 152                 lport = sin6->sin6_port;
 153                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 154                         /*
 155                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 156                          * allow compepte duplication of binding if
 157                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 158                          * and a multicast address is bound on both
 159                          * new and duplicated sockets.
 160                          */
 161                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
 162                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 163                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 164                         struct ifaddr *ifa;
 165
 166                         sin6->sin6_port = 0;            /* yech... */
 167                         if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
 168                             NULL &&
 169                             (inp->inp_flags & INP_BINDANY) == 0) {
 170                                 return (EADDRNOTAVAIL);
 171                         }
 172
 173                         /*
 174                          * XXX: bind to an anycast address might accidentally
 175                          * cause sending a packet with anycast source address.
 176                          * We should allow to bind to a deprecated address, since
 177                          * the application dares to use it.
 178                          */
 179                         if (ifa != NULL &&
 180                             ((struct in6_ifaddr *)ifa)->ia6_flags &
 181                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 182                                 ifa_free(ifa);
 183                                 return (EADDRNOTAVAIL);
 184                         }
 185                         if (ifa != NULL)
 186                                 ifa_free(ifa);
 187                 }
 188                 if (lport) {
 189                         struct inpcb *t;
 190                         struct tcptw *tw;
 191
 192                         /* GROSS */
 193                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 194                             ntohs(lport) >= V_ipport_reservedlow &&
 195                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 196                             0))
 197                                 return (EACCES);
 198                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
 199                             priv_check_cred(inp->inp_cred,
 200                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 201                                 t = in6_pcblookup_local(pcbinfo,
 202                                     &sin6->sin6_addr, lport,
 203                                     INPLOOKUP_WILDCARD, cred);
 204                                 if (t &&
 205                                     ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 206                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 207                                     (so->so_type != SOCK_STREAM ||
 208                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
 209                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 210                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 211                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 212                                     (inp->inp_cred->cr_uid !=
 213                                      t->inp_cred->cr_uid))
 214                                         return (EADDRINUSE);
 215
 216                                 /*
 217                                  * If the socket is a BINDMULTI socket, then
 218                                  * the credentials need to match and the
 219                                  * original socket also has to have been bound
 220                                  * with BINDMULTI.
 221                                  */
 222                                 if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 223                                         return (EADDRINUSE);
 224
 225 #ifdef INET
 226                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 227                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 228                                         struct sockaddr_in sin;
 229
 230                                         in6_sin6_2_sin(&sin, sin6);
 231                                         t = in_pcblookup_local(pcbinfo,
 232                                             sin.sin_addr, lport,
 233                                             INPLOOKUP_WILDCARD, cred);
 234                                         if (t &&
 235                                             ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 236                                             ((t->inp_flags &
 237                                               INP_TIMEWAIT) == 0) &&
 238                                             (so->so_type != SOCK_STREAM ||
 239                                              ntohl(t->inp_faddr.s_addr) ==
 240                                               INADDR_ANY) &&
 241                                             (inp->inp_cred->cr_uid !=
 242                                              t->inp_cred->cr_uid))
 243                                                 return (EADDRINUSE);
 244
 245                                         if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 246                                                 return (EADDRINUSE);
 247                                 }
 248 #endif
 249                         }
 250                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 251                             lport, lookupflags, cred);
 252                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 253                                 /*
 254                                  * XXXRW: If an incpb has had its timewait
 255                                  * state recycled, we treat the address as
 256                                  * being in use (for now).  This is better
 257                                  * than a panic, but not desirable.
 258                                  */
 259                                 tw = intotw(t);
 260                                 if (tw == NULL ||
 261                                     (reuseport & tw->tw_so_options) == 0)
 262                                         return (EADDRINUSE);
 263                         } else if (t && (reuseport & inp_so_options(t)) == 0) {
 264                                 return (EADDRINUSE);
 265                         }
 266 #ifdef INET
 267                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 268                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 269                                 struct sockaddr_in sin;
 270
 271                                 in6_sin6_2_sin(&sin, sin6);
 272                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 273                                     lport, lookupflags, cred);
 274                                 if (t && t->inp_flags & INP_TIMEWAIT) {
 275                                         tw = intotw(t);
 276                                         if (tw == NULL)
 277                                                 return (EADDRINUSE);
 278                                         if ((reuseport & tw->tw_so_options) == 0
 279                                             && (ntohl(t->inp_laddr.s_addr) !=
 280                                              INADDR_ANY || ((inp->inp_vflag &
 281                                              INP_IPV6PROTO) ==
 282                                              (t->inp_vflag & INP_IPV6PROTO))))
 283                                                 return (EADDRINUSE);
 284                                 } else if (t &&
 285                                     (reuseport & inp_so_options(t)) == 0 &&
 286                                     (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 287                                     (t->inp_vflag & INP_IPV6PROTO) != 0))
 288                                         return (EADDRINUSE);
 289                         }
 290 #endif
 291                 }
 292                 inp->in6p_laddr = sin6->sin6_addr;
 293         }
 294         if (lport == 0) {
 295                 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
 296                         /* Undo an address bind that may have occurred. */
 297                         inp->in6p_laddr = in6addr_any;
 298                         return (error);
 299                 }
 300         } else {
 301                 inp->inp_lport = lport;
 302                 if (in_pcbinshash(inp) != 0) {
 303                         inp->in6p_laddr = in6addr_any;
 304                         inp->inp_lport = 0;
 305                         return (EAGAIN);
 306                 }
 307         }
 308         return (0);
 309 }
 310
 311 /*
 312  *   Transform old in6_pcbconnect() into an inner subroutine for new
 313  *   in6_pcbconnect(): Do some validity-checking on the remote
 314  *   address (in mbuf 'nam') and then determine local host address
 315  *   (i.e., which interface) to use to access that remote host.
 316  *
 317  *   This preserves definition of in6_pcbconnect(), while supporting a
 318  *   slightly different version for T/TCP.  (This is more than
 319  *   a bit of a kludge, but cleaning up the internal interfaces would
 320  *   have forced minor changes in every protocol).
 321  */
 322 int
 323 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam,
 324     struct in6_addr *plocal_addr6)
 325 {
 326         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 327         int error = 0;
 328         struct ifnet *ifp = NULL;
 329         int scope_ambiguous = 0;
 330         struct in6_addr in6a;
 331
 332         INP_WLOCK_ASSERT(inp);
 333         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);        /* XXXRW: why? */
 334
 335         if (nam->sa_len != sizeof (*sin6))
 336                 return (EINVAL);
 337         if (sin6->sin6_family != AF_INET6)
 338                 return (EAFNOSUPPORT);
 339         if (sin6->sin6_port == 0)
 340                 return (EADDRNOTAVAIL);
 341
 342         if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 343                 scope_ambiguous = 1;
 344         if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 345                 return(error);
 346
 347         if (!TAILQ_EMPTY(&V_in6_ifaddrhead)) {
 348                 /*
 349                  * If the destination address is UNSPECIFIED addr,
 350                  * use the loopback addr, e.g ::1.
 351                  */
 352                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 353                         sin6->sin6_addr = in6addr_loopback;
 354         }
 355         if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
 356                 return (error);
 357
 358         error = in6_selectsrc(sin6, inp->in6p_outputopts,
 359             inp, NULL, inp->inp_cred, &ifp, &in6a);
 360         if (error)
 361                 return (error);
 362
 363         if (ifp && scope_ambiguous &&
 364             (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
 365                 return(error);
 366         }
 367
 368         /*
 369          * Do not update this earlier, in case we return with an error.
 370          *
 371          * XXX: this in6_selectsrc result might replace the bound local
 372          * address with the address specified by setsockopt(IPV6_PKTINFO).
 373          * Is it the intended behavior?
 374          */
 375         *plocal_addr6 = in6a;
 376
 377         /*
 378          * Don't do pcblookup call here; return interface in
 379          * plocal_addr6
 380          * and exit to caller, that will do the lookup.
 381          */
 382
 383         return (0);
 384 }
 385
 386 /*
 387  * Outer subroutine:
 388  * Connect from a socket to a specified address.
 389  * Both address and port must be specified in argument sin.
 390  * If don't have a local address for this socket yet,
 391  * then pick one.
 392  */
 393 int
 394 in6_pcbconnect_mbuf(register struct inpcb *inp, struct sockaddr *nam,
 395     struct ucred *cred, struct mbuf *m)
 396 {
 397         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 398         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 399         struct in6_addr addr6;
 400         int error;
 401
 402         INP_WLOCK_ASSERT(inp);
 403         INP_HASH_WLOCK_ASSERT(pcbinfo);
 404
 405         /*
 406          * Call inner routine, to assign local interface address.
 407          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 408          */
 409         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 410                 return (error);
 411
 412         if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
 413                                sin6->sin6_port,
 414                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 415                               ? &addr6 : &inp->in6p_laddr,
 416                               inp->inp_lport, 0, NULL) != NULL) {
 417                 return (EADDRINUSE);
 418         }
 419         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 420                 if (inp->inp_lport == 0) {
 421                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
 422                         if (error)
 423                                 return (error);
 424                 }
 425                 inp->in6p_laddr = addr6;
 426         }
 427         inp->in6p_faddr = sin6->sin6_addr;
 428         inp->inp_fport = sin6->sin6_port;
 429         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 430         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 431         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
 432                 inp->inp_flow |=
 433                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 434
 435         in_pcbrehash_mbuf(inp, m);
 436
 437         return (0);
 438 }
 439
 440 int
 441 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 442 {
 443
 444         return (in6_pcbconnect_mbuf(inp, nam, cred, NULL));
 445 }
 446
 447 void
 448 in6_pcbdisconnect(struct inpcb *inp)
 449 {
 450
 451         INP_WLOCK_ASSERT(inp);
 452         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 453
 454         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 455         inp->inp_fport = 0;
 456         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 457         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 458         in_pcbrehash(inp);
 459 }
 460
 461 struct sockaddr *
 462 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
 463 {
 464         struct sockaddr_in6 *sin6;
 465
 466         sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
 467         bzero(sin6, sizeof *sin6);
 468         sin6->sin6_family = AF_INET6;
 469         sin6->sin6_len = sizeof(*sin6);
 470         sin6->sin6_port = port;
 471         sin6->sin6_addr = *addr_p;
 472         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
 473
 474         return (struct sockaddr *)sin6;
 475 }
 476
 477 struct sockaddr *
 478 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
 479 {
 480         struct sockaddr_in sin;
 481         struct sockaddr_in6 *sin6_p;
 482
 483         bzero(&sin, sizeof sin);
 484         sin.sin_family = AF_INET;
 485         sin.sin_len = sizeof(sin);
 486         sin.sin_port = port;
 487         sin.sin_addr = *addr_p;
 488
 489         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
 490                 M_WAITOK);
 491         in6_sin_2_v4mapsin6(&sin, sin6_p);
 492
 493         return (struct sockaddr *)sin6_p;
 494 }
 495
 496 int
 497 in6_getsockaddr(struct socket *so, struct sockaddr **nam)
 498 {
 499         register struct inpcb *inp;
 500         struct in6_addr addr;
 501         in_port_t port;
 502
 503         inp = sotoinpcb(so);
 504         KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
 505
 506         INP_RLOCK(inp);
 507         port = inp->inp_lport;
 508         addr = inp->in6p_laddr;
 509         INP_RUNLOCK(inp);
 510
 511         *nam = in6_sockaddr(port, &addr);
 512         return 0;
 513 }
 514
 515 int
 516 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 517 {
 518         struct inpcb *inp;
 519         struct in6_addr addr;
 520         in_port_t port;
 521
 522         inp = sotoinpcb(so);
 523         KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
 524
 525         INP_RLOCK(inp);
 526         port = inp->inp_fport;
 527         addr = inp->in6p_faddr;
 528         INP_RUNLOCK(inp);
 529
 530         *nam = in6_sockaddr(port, &addr);
 531         return 0;
 532 }
 533
 534 int
 535 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 536 {
 537         struct  inpcb *inp;
 538         int     error;
 539
 540         inp = sotoinpcb(so);
 541         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
 542
 543 #ifdef INET
 544         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 545                 error = in_getsockaddr(so, nam);
 546                 if (error == 0)
 547                         in6_sin_2_v4mapsin6_in_sock(nam);
 548         } else
 549 #endif
 550         {
 551                 /* scope issues will be handled in in6_getsockaddr(). */
 552                 error = in6_getsockaddr(so, nam);
 553         }
 554
 555         return error;
 556 }
 557
 558 int
 559 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 560 {
 561         struct  inpcb *inp;
 562         int     error;
 563
 564         inp = sotoinpcb(so);
 565         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
 566
 567 #ifdef INET
 568         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 569                 error = in_getpeeraddr(so, nam);
 570                 if (error == 0)
 571                         in6_sin_2_v4mapsin6_in_sock(nam);
 572         } else
 573 #endif
 574         /* scope issues will be handled in in6_getpeeraddr(). */
 575         error = in6_getpeeraddr(so, nam);
 576
 577         return error;
 578 }
 579
 580 /*
 581  * Pass some notification to all connections of a protocol
 582  * associated with address dst.  The local address and/or port numbers
 583  * may be specified to limit the search.  The "usual action" will be
 584  * taken, depending on the ctlinput cmd.  The caller must filter any
 585  * cmds that are uninteresting (e.g., no error in the map).
 586  * Call the protocol specific routine (if any) to report
 587  * any errors for each matching socket.
 588  */
 589 void
 590 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
 591     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
 592     int cmd, void *cmdarg,
 593     struct inpcb *(*notify)(struct inpcb *, int))
 594 {
 595         struct inpcb *inp, *inp_temp;
 596         struct sockaddr_in6 sa6_src, *sa6_dst;
 597         u_short fport = fport_arg, lport = lport_arg;
 598         u_int32_t flowinfo;
 599         int errno;
 600
 601         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 602                 return;
 603
 604         sa6_dst = (struct sockaddr_in6 *)dst;
 605         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 606                 return;
 607
 608         /*
 609          * note that src can be NULL when we get notify by local fragmentation.
 610          */
 611         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 612         flowinfo = sa6_src.sin6_flowinfo;
 613
 614         /*
 615          * Redirects go to all references to the destination,
 616          * and use in6_rtchange to invalidate the route cache.
 617          * Dead host indications: also use in6_rtchange to invalidate
 618          * the cache, and deliver the error to all the sockets.
 619          * Otherwise, if we have knowledge of the local port and address,
 620          * deliver only to that socket.
 621          */
 622         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 623                 fport = 0;
 624                 lport = 0;
 625                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 626
 627                 if (cmd != PRC_HOSTDEAD)
 628                         notify = in6_rtchange;
 629         }
 630         errno = inet6ctlerrmap[cmd];
 631         INP_INFO_WLOCK(pcbinfo);
 632         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
 633                 INP_WLOCK(inp);
 634                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 635                         INP_WUNLOCK(inp);
 636                         continue;
 637                 }
 638
 639                 /*
 640                  * If the error designates a new path MTU for a destination
 641                  * and the application (associated with this socket) wanted to
 642                  * know the value, notify. Note that we notify for all
 643                  * disconnected sockets if the corresponding application
 644                  * wanted. This is because some UDP applications keep sending
 645                  * sockets disconnected.
 646                  * XXX: should we avoid to notify the value to TCP sockets?
 647                  */
 648                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 649                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 650                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 651                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
 652                                         (u_int32_t *)cmdarg);
 653                 }
 654
 655                 /*
 656                  * Detect if we should notify the error. If no source and
 657                  * destination ports are specifed, but non-zero flowinfo and
 658                  * local address match, notify the error. This is the case
 659                  * when the error is delivered with an encrypted buffer
 660                  * by ESP. Otherwise, just compare addresses and ports
 661                  * as usual.
 662                  */
 663                 if (lport == 0 && fport == 0 && flowinfo &&
 664                     inp->inp_socket != NULL &&
 665                     flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
 666                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 667                         goto do_notify;
 668                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 669                                              &sa6_dst->sin6_addr) ||
 670                          inp->inp_socket == 0 ||
 671                          (lport && inp->inp_lport != lport) ||
 672                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 673                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 674                                               &sa6_src.sin6_addr)) ||
 675                          (fport && inp->inp_fport != fport)) {
 676                         INP_WUNLOCK(inp);
 677                         continue;
 678                 }
 679
 680           do_notify:
 681                 if (notify) {
 682                         if ((*notify)(inp, errno))
 683                                 INP_WUNLOCK(inp);
 684                 } else
 685                         INP_WUNLOCK(inp);
 686         }
 687         INP_INFO_WUNLOCK(pcbinfo);
 688 }
 689
 690 /*
 691  * Lookup a PCB based on the local address and port.  Caller must hold the
 692  * hash lock.  No inpcb locks or references are acquired.
 693  */
 694 struct inpcb *
 695 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
 696     u_short lport, int lookupflags, struct ucred *cred)
 697 {
 698         register struct inpcb *inp;
 699         int matchwild = 3, wildcard;
 700
 701         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 702             ("%s: invalid lookup flags %d", __func__, lookupflags));
 703
 704         INP_HASH_WLOCK_ASSERT(pcbinfo);
 705
 706         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
 707                 struct inpcbhead *head;
 708                 /*
 709                  * Look for an unconnected (wildcard foreign addr) PCB that
 710                  * matches the local address and port we're looking for.
 711                  */
 712                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
 713                     0, pcbinfo->ipi_hashmask)];
 714                 LIST_FOREACH(inp, head, inp_hash) {
 715                         /* XXX inp locking */
 716                         if ((inp->inp_vflag & INP_IPV6) == 0)
 717                                 continue;
 718                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 719                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 720                             inp->inp_lport == lport) {
 721                                 /* Found. */
 722                                 if (cred == NULL ||
 723                                     prison_equal_ip6(cred->cr_prison,
 724                                         inp->inp_cred->cr_prison))
 725                                         return (inp);
 726                         }
 727                 }
 728                 /*
 729                  * Not found.
 730                  */
 731                 return (NULL);
 732         } else {
 733                 struct inpcbporthead *porthash;
 734                 struct inpcbport *phd;
 735                 struct inpcb *match = NULL;
 736                 /*
 737                  * Best fit PCB lookup.
 738                  *
 739                  * First see if this local port is in use by looking on the
 740                  * port hash list.
 741                  */
 742                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 743                     pcbinfo->ipi_porthashmask)];
 744                 LIST_FOREACH(phd, porthash, phd_hash) {
 745                         if (phd->phd_port == lport)
 746                                 break;
 747                 }
 748                 if (phd != NULL) {
 749                         /*
 750                          * Port is in use by one or more PCBs. Look for best
 751                          * fit.
 752                          */
 753                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 754                                 wildcard = 0;
 755                                 if (cred != NULL &&
 756                                     !prison_equal_ip6(cred->cr_prison,
 757                                         inp->inp_cred->cr_prison))
 758                                         continue;
 759                                 /* XXX inp locking */
 760                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 761                                         continue;
 762                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 763                                         wildcard++;
 764                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 765                                         &inp->in6p_laddr)) {
 766                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 767                                                 wildcard++;
 768                                         else if (!IN6_ARE_ADDR_EQUAL(
 769                                             &inp->in6p_laddr, laddr))
 770                                                 continue;
 771                                 } else {
 772                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 773                                                 wildcard++;
 774                                 }
 775                                 if (wildcard < matchwild) {
 776                                         match = inp;
 777                                         matchwild = wildcard;
 778                                         if (matchwild == 0)
 779                                                 break;
 780                                 }
 781                         }
 782                 }
 783                 return (match);
 784         }
 785 }
 786
 787 void
 788 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 789 {
 790         struct inpcb *in6p;
 791         struct ip6_moptions *im6o;
 792         int i, gap;
 793
 794         INP_INFO_RLOCK(pcbinfo);
 795         LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
 796                 INP_WLOCK(in6p);
 797                 im6o = in6p->in6p_moptions;
 798                 if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) {
 799                         /*
 800                          * Unselect the outgoing ifp for multicast if it
 801                          * is being detached.
 802                          */
 803                         if (im6o->im6o_multicast_ifp == ifp)
 804                                 im6o->im6o_multicast_ifp = NULL;
 805                         /*
 806                          * Drop multicast group membership if we joined
 807                          * through the interface being detached.
 808                          */
 809                         gap = 0;
 810                         for (i = 0; i < im6o->im6o_num_memberships; i++) {
 811                                 if (im6o->im6o_membership[i]->in6m_ifp ==
 812                                     ifp) {
 813                                         in6_mc_leave(im6o->im6o_membership[i],
 814                                             NULL);
 815                                         gap++;
 816                                 } else if (gap != 0) {
 817                                         im6o->im6o_membership[i - gap] =
 818                                             im6o->im6o_membership[i];
 819                                 }
 820                         }
 821                         im6o->im6o_num_memberships -= gap;
 822                 }
 823                 INP_WUNLOCK(in6p);
 824         }
 825         INP_INFO_RUNLOCK(pcbinfo);
 826 }
 827
 828 /*
 829  * Check for alternatives when higher level complains
 830  * about service problems.  For now, invalidate cached
 831  * routing information.  If the route was created dynamically
 832  * (by a redirect), time to try a default gateway again.
 833  */
 834 void
 835 in6_losing(struct inpcb *in6p)
 836 {
 837
 838         /*
 839          * We don't store route pointers in the routing table anymore
 840          */
 841         return;
 842 }
 843
 844 /*
 845  * After a routing change, flush old routing
 846  * and allocate a (hopefully) better one.
 847  */
 848 struct inpcb *
 849 in6_rtchange(struct inpcb *inp, int errno)
 850 {
 851         /*
 852          * We don't store route pointers in the routing table anymore
 853          */
 854         return inp;
 855 }
 856
 857 #ifdef PCBGROUP
 858 /*
 859  * Lookup PCB in hash list, using pcbgroup tables.
 860  */
 861 static struct inpcb *
 862 in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
 863     struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
 864     u_int lport_arg, int lookupflags, struct ifnet *ifp)
 865 {
 866         struct inpcbhead *head;
 867         struct inpcb *inp, *tmpinp;
 868         u_short fport = fport_arg, lport = lport_arg;
 869         int faith;
 870
 871         if (faithprefix_p != NULL)
 872                 faith = (*faithprefix_p)(laddr);
 873         else
 874                 faith = 0;
 875
 876         /*
 877          * First look for an exact match.
 878          */
 879         tmpinp = NULL;
 880         INP_GROUP_LOCK(pcbgroup);
 881         head = &pcbgroup->ipg_hashbase[
 882             INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport,
 883             pcbgroup->ipg_hashmask)];
 884         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 885                 /* XXX inp locking */
 886                 if ((inp->inp_vflag & INP_IPV6) == 0)
 887                         continue;
 888                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 889                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 890                     inp->inp_fport == fport &&
 891                     inp->inp_lport == lport) {
 892                         /*
 893                          * XXX We should be able to directly return
 894                          * the inp here, without any checks.
 895                          * Well unless both bound with SO_REUSEPORT?
 896                          */
 897                         if (prison_flag(inp->inp_cred, PR_IP6))
 898                                 goto found;
 899                         if (tmpinp == NULL)
 900                                 tmpinp = inp;
 901                 }
 902         }
 903         if (tmpinp != NULL) {
 904                 inp = tmpinp;
 905                 goto found;
 906         }
 907
 908         /*
 909          * Then look for a wildcard match in the pcbgroup.
 910          */
 911         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 912                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 913                 struct inpcb *jail_wild = NULL;
 914                 int injail;
 915
 916                 /*
 917                  * Order of socket selection - we always prefer jails.
 918                  *      1. jailed, non-wild.
 919                  *      2. jailed, wild.
 920                  *      3. non-jailed, non-wild.
 921                  *      4. non-jailed, wild.
 922                  */
 923                 head = &pcbgroup->ipg_hashbase[
 924                     INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
 925                 LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 926                         /* XXX inp locking */
 927                         if ((inp->inp_vflag & INP_IPV6) == 0)
 928                                 continue;
 929
 930                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 931                             inp->inp_lport != lport) {
 932                                 continue;
 933                         }
 934
 935                         /* XXX inp locking */
 936                         if (faith && (inp->inp_flags & INP_FAITH) == 0)
 937                                 continue;
 938
 939                         injail = prison_flag(inp->inp_cred, PR_IP6);
 940                         if (injail) {
 941                                 if (prison_check_ip6(inp->inp_cred,
 942                                     laddr) != 0)
 943                                         continue;
 944                         } else {
 945                                 if (local_exact != NULL)
 946                                         continue;
 947                         }
 948
 949                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
 950                                 if (injail)
 951                                         goto found;
 952                                 else
 953                                         local_exact = inp;
 954                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 955                                 if (injail)
 956                                         jail_wild = inp;
 957                                 else
 958                                         local_wild = inp;
 959                         }
 960                 } /* LIST_FOREACH */
 961
 962                 inp = jail_wild;
 963                 if (inp == NULL)
 964                         inp = jail_wild;
 965                 if (inp == NULL)
 966                         inp = local_exact;
 967                 if (inp == NULL)
 968                         inp = local_wild;
 969                 if (inp != NULL)
 970                         goto found;
 971         }
 972
 973         /*
 974          * Then look for a wildcard match, if requested.
 975          */
 976         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 977                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 978                 struct inpcb *jail_wild = NULL;
 979                 int injail;
 980
 981                 /*
 982                  * Order of socket selection - we always prefer jails.
 983                  *      1. jailed, non-wild.
 984                  *      2. jailed, wild.
 985                  *      3. non-jailed, non-wild.
 986                  *      4. non-jailed, wild.
 987                  */
 988                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(INADDR_ANY, lport,
 989                     0, pcbinfo->ipi_wildmask)];
 990                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
 991                         /* XXX inp locking */
 992                         if ((inp->inp_vflag & INP_IPV6) == 0)
 993                                 continue;
 994
 995                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 996                             inp->inp_lport != lport) {
 997                                 continue;
 998                         }
 999
1000                         /* XXX inp locking */
1001                         if (faith && (inp->inp_flags & INP_FAITH) == 0)
1002                                 continue;
1003
1004                         injail = prison_flag(inp->inp_cred, PR_IP6);
1005                         if (injail) {
1006                                 if (prison_check_ip6(inp->inp_cred,
1007                                     laddr) != 0)
1008                                         continue;
1009                         } else {
1010                                 if (local_exact != NULL)
1011                                         continue;
1012                         }
1013
1014                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1015                                 if (injail)
1016                                         goto found;
1017                                 else
1018                                         local_exact = inp;
1019                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1020                                 if (injail)
1021                                         jail_wild = inp;
1022                                 else
1023                                         local_wild = inp;
1024                         }
1025                 } /* LIST_FOREACH */
1026
1027                 inp = jail_wild;
1028                 if (inp == NULL)
1029                         inp = jail_wild;
1030                 if (inp == NULL)
1031                         inp = local_exact;
1032                 if (inp == NULL)
1033                         inp = local_wild;
1034                 if (inp != NULL)
1035                         goto found;
1036         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1037         INP_GROUP_UNLOCK(pcbgroup);
1038         return (NULL);
1039
1040 found:
1041         in_pcbref(inp);
1042         INP_GROUP_UNLOCK(pcbgroup);
1043         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1044                 INP_WLOCK(inp);
1045                 if (in_pcbrele_wlocked(inp))
1046                         return (NULL);
1047         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1048                 INP_RLOCK(inp);
1049                 if (in_pcbrele_rlocked(inp))
1050                         return (NULL);
1051         } else
1052                 panic("%s: locking buf", __func__);
1053         return (inp);
1054 }
1055 #endif /* PCBGROUP */
1056
1057 /*
1058  * Lookup PCB in hash list.
1059  */
1060 struct inpcb *
1061 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1062     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1063     int lookupflags, struct ifnet *ifp)
1064 {
1065         struct inpcbhead *head;
1066         struct inpcb *inp, *tmpinp;
1067         u_short fport = fport_arg, lport = lport_arg;
1068         int faith;
1069
1070         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1071             ("%s: invalid lookup flags %d", __func__, lookupflags));
1072
1073         INP_HASH_LOCK_ASSERT(pcbinfo);
1074
1075         if (faithprefix_p != NULL)
1076                 faith = (*faithprefix_p)(laddr);
1077         else
1078                 faith = 0;
1079
1080         /*
1081          * First look for an exact match.
1082          */
1083         tmpinp = NULL;
1084         head = &pcbinfo->ipi_hashbase[
1085             INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport,
1086             pcbinfo->ipi_hashmask)];
1087         LIST_FOREACH(inp, head, inp_hash) {
1088                 /* XXX inp locking */
1089                 if ((inp->inp_vflag & INP_IPV6) == 0)
1090                         continue;
1091                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1092                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1093                     inp->inp_fport == fport &&
1094                     inp->inp_lport == lport) {
1095                         /*
1096                          * XXX We should be able to directly return
1097                          * the inp here, without any checks.
1098                          * Well unless both bound with SO_REUSEPORT?
1099                          */
1100                         if (prison_flag(inp->inp_cred, PR_IP6))
1101                                 return (inp);
1102                         if (tmpinp == NULL)
1103                                 tmpinp = inp;
1104                 }
1105         }
1106         if (tmpinp != NULL)
1107                 return (tmpinp);
1108
1109         /*
1110          * Then look for a wildcard match, if requested.
1111          */
1112         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1113                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1114                 struct inpcb *jail_wild = NULL;
1115                 int injail;
1116
1117                 /*
1118                  * Order of socket selection - we always prefer jails.
1119                  *      1. jailed, non-wild.
1120                  *      2. jailed, wild.
1121                  *      3. non-jailed, non-wild.
1122                  *      4. non-jailed, wild.
1123                  */
1124                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
1125                     0, pcbinfo->ipi_hashmask)];
1126                 LIST_FOREACH(inp, head, inp_hash) {
1127                         /* XXX inp locking */
1128                         if ((inp->inp_vflag & INP_IPV6) == 0)
1129                                 continue;
1130
1131                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1132                             inp->inp_lport != lport) {
1133                                 continue;
1134                         }
1135
1136                         /* XXX inp locking */
1137                         if (faith && (inp->inp_flags & INP_FAITH) == 0)
1138                                 continue;
1139
1140                         injail = prison_flag(inp->inp_cred, PR_IP6);
1141                         if (injail) {
1142                                 if (prison_check_ip6(inp->inp_cred,
1143                                     laddr) != 0)
1144                                         continue;
1145                         } else {
1146                                 if (local_exact != NULL)
1147                                         continue;
1148                         }
1149
1150                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1151                                 if (injail)
1152                                         return (inp);
1153                                 else
1154                                         local_exact = inp;
1155                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1156                                 if (injail)
1157                                         jail_wild = inp;
1158                                 else
1159                                         local_wild = inp;
1160                         }
1161                 } /* LIST_FOREACH */
1162
1163                 if (jail_wild != NULL)
1164                         return (jail_wild);
1165                 if (local_exact != NULL)
1166                         return (local_exact);
1167                 if (local_wild != NULL)
1168                         return (local_wild);
1169         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1170
1171         /*
1172          * Not found.
1173          */
1174         return (NULL);
1175 }
1176
1177 /*
1178  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1179  * hash list lock, and will return the inpcb locked (i.e., requires
1180  * INPLOOKUP_LOCKPCB).
1181  */
1182 static struct inpcb *
1183 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1184     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1185     struct ifnet *ifp)
1186 {
1187         struct inpcb *inp;
1188
1189         INP_HASH_RLOCK(pcbinfo);
1190         inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1191             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1192         if (inp != NULL) {
1193                 in_pcbref(inp);
1194                 INP_HASH_RUNLOCK(pcbinfo);
1195                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1196                         INP_WLOCK(inp);
1197                         if (in_pcbrele_wlocked(inp))
1198                                 return (NULL);
1199                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1200                         INP_RLOCK(inp);
1201                         if (in_pcbrele_rlocked(inp))
1202                                 return (NULL);
1203                 } else
1204                         panic("%s: locking bug", __func__);
1205         } else
1206                 INP_HASH_RUNLOCK(pcbinfo);
1207         return (inp);
1208 }
1209
1210 /*
1211  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1212  * from which a pre-calculated hash value may be extracted.
1213  *
1214  * Possibly more of this logic should be in in6_pcbgroup.c.
1215  */
1216 struct inpcb *
1217 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
1218     struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1219 {
1220 #if defined(PCBGROUP) && !defined(RSS)
1221         struct inpcbgroup *pcbgroup;
1222 #endif
1223
1224         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1225             ("%s: invalid lookup flags %d", __func__, lookupflags));
1226         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1227             ("%s: LOCKPCB not set", __func__));
1228
1229         /*
1230          * When not using RSS, use connection groups in preference to the
1231          * reservation table when looking up 4-tuples.  When using RSS, just
1232          * use the reservation table, due to the cost of the Toeplitz hash
1233          * in software.
1234          *
1235          * XXXRW: This policy belongs in the pcbgroup code, as in principle
1236          * we could be doing RSS with a non-Toeplitz hash that is affordable
1237          * in software.
1238          */
1239 #if defined(PCBGROUP) && !defined(RSS)
1240         if (in_pcbgroup_enabled(pcbinfo)) {
1241                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1242                     fport);
1243                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1244                     laddr, lport, lookupflags, ifp));
1245         }
1246 #endif
1247         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1248             lookupflags, ifp));
1249 }
1250
1251 struct inpcb *
1252 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1253     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1254     struct ifnet *ifp, struct mbuf *m)
1255 {
1256 #ifdef PCBGROUP
1257         struct inpcbgroup *pcbgroup;
1258 #endif
1259
1260         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1261             ("%s: invalid lookup flags %d", __func__, lookupflags));
1262         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1263             ("%s: LOCKPCB not set", __func__));
1264
1265 #ifdef PCBGROUP
1266         /*
1267          * If we can use a hardware-generated hash to look up the connection
1268          * group, use that connection group to find the inpcb.  Otherwise
1269          * fall back on a software hash -- or the reservation table if we're
1270          * using RSS.
1271          *
1272          * XXXRW: As above, that policy belongs in the pcbgroup code.
1273          */
1274         if (in_pcbgroup_enabled(pcbinfo) &&
1275             !(M_HASHTYPE_TEST(m, M_HASHTYPE_NONE))) {
1276                 pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1277                     m->m_pkthdr.flowid);
1278                 if (pcbgroup != NULL)
1279                         return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
1280                             fport, laddr, lport, lookupflags, ifp));
1281 #ifndef RSS
1282                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1283                     fport);
1284                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1285                     laddr, lport, lookupflags, ifp));
1286 #endif
1287         }
1288 #endif
1289         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1290             lookupflags, ifp));
1291 }
1292
1293 void
1294 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1295 {
1296         struct ip6_hdr *ip;
1297
1298         ip = mtod(m, struct ip6_hdr *);
1299         bzero(sin6, sizeof(*sin6));
1300         sin6->sin6_len = sizeof(*sin6);
1301         sin6->sin6_family = AF_INET6;
1302         sin6->sin6_addr = ip->ip6_src;
1303
1304         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
1305
1306         return;
1307 }