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 static struct inpcb *in6_pcblookup_hash_locked(struct inpcbinfo *,
 112     struct in6_addr *, u_int, struct in6_addr *, u_int, int, struct ifnet *);
 113
 114 int
 115 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam,
 116     struct ucred *cred)
 117 {
 118         struct socket *so = inp->inp_socket;
 119         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 120         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 121         u_short lport = 0;
 122         int error, lookupflags = 0;
 123         int reuseport = (so->so_options & SO_REUSEPORT);
 124
 125         INP_WLOCK_ASSERT(inp);
 126         INP_HASH_WLOCK_ASSERT(pcbinfo);
 127
 128         if (TAILQ_EMPTY(&V_in6_ifaddrhead))     /* XXX broken! */
 129                 return (EADDRNOTAVAIL);
 130         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 131                 return (EINVAL);
 132         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 133                 lookupflags = INPLOOKUP_WILDCARD;
 134         if (nam == NULL) {
 135                 if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
 136                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
 137                         return (error);
 138         } else {
 139                 sin6 = (struct sockaddr_in6 *)nam;
 140                 if (nam->sa_len != sizeof(*sin6))
 141                         return (EINVAL);
 142                 /*
 143                  * family check.
 144                  */
 145                 if (nam->sa_family != AF_INET6)
 146                         return (EAFNOSUPPORT);
 147
 148                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 149                         return(error);
 150
 151                 if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
 152                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
 153                         return (error);
 154
 155                 lport = sin6->sin6_port;
 156                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 157                         /*
 158                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 159                          * allow compepte duplication of binding if
 160                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 161                          * and a multicast address is bound on both
 162                          * new and duplicated sockets.
 163                          */
 164                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
 165                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 166                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 167                         struct ifaddr *ifa;
 168
 169                         sin6->sin6_port = 0;            /* yech... */
 170                         if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
 171                             NULL &&
 172                             (inp->inp_flags & INP_BINDANY) == 0) {
 173                                 return (EADDRNOTAVAIL);
 174                         }
 175
 176                         /*
 177                          * XXX: bind to an anycast address might accidentally
 178                          * cause sending a packet with anycast source address.
 179                          * We should allow to bind to a deprecated address, since
 180                          * the application dares to use it.
 181                          */
 182                         if (ifa != NULL &&
 183                             ((struct in6_ifaddr *)ifa)->ia6_flags &
 184                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 185                                 ifa_free(ifa);
 186                                 return (EADDRNOTAVAIL);
 187                         }
 188                         if (ifa != NULL)
 189                                 ifa_free(ifa);
 190                 }
 191                 if (lport) {
 192                         struct inpcb *t;
 193                         struct tcptw *tw;
 194
 195                         /* GROSS */
 196                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 197                             ntohs(lport) >= V_ipport_reservedlow &&
 198                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 199                             0))
 200                                 return (EACCES);
 201                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
 202                             priv_check_cred(inp->inp_cred,
 203                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 204                                 t = in6_pcblookup_local(pcbinfo,
 205                                     &sin6->sin6_addr, lport,
 206                                     INPLOOKUP_WILDCARD, cred);
 207                                 if (t &&
 208                                     ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 209                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 210                                     (so->so_type != SOCK_STREAM ||
 211                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
 212                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 213                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 214                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 215                                     (inp->inp_cred->cr_uid !=
 216                                      t->inp_cred->cr_uid))
 217                                         return (EADDRINUSE);
 218
 219                                 /*
 220                                  * If the socket is a BINDMULTI socket, then
 221                                  * the credentials need to match and the
 222                                  * original socket also has to have been bound
 223                                  * with BINDMULTI.
 224                                  */
 225                                 if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 226                                         return (EADDRINUSE);
 227
 228 #ifdef INET
 229                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 230                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 231                                         struct sockaddr_in sin;
 232
 233                                         in6_sin6_2_sin(&sin, sin6);
 234                                         t = in_pcblookup_local(pcbinfo,
 235                                             sin.sin_addr, lport,
 236                                             INPLOOKUP_WILDCARD, cred);
 237                                         if (t &&
 238                                             ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 239                                             ((t->inp_flags &
 240                                               INP_TIMEWAIT) == 0) &&
 241                                             (so->so_type != SOCK_STREAM ||
 242                                              ntohl(t->inp_faddr.s_addr) ==
 243                                               INADDR_ANY) &&
 244                                             (inp->inp_cred->cr_uid !=
 245                                              t->inp_cred->cr_uid))
 246                                                 return (EADDRINUSE);
 247
 248                                         if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 249                                                 return (EADDRINUSE);
 250                                 }
 251 #endif
 252                         }
 253                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 254                             lport, lookupflags, cred);
 255                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 256                                 /*
 257                                  * XXXRW: If an incpb has had its timewait
 258                                  * state recycled, we treat the address as
 259                                  * being in use (for now).  This is better
 260                                  * than a panic, but not desirable.
 261                                  */
 262                                 tw = intotw(t);
 263                                 if (tw == NULL ||
 264                                     (reuseport & tw->tw_so_options) == 0)
 265                                         return (EADDRINUSE);
 266                         } else if (t && (reuseport & inp_so_options(t)) == 0) {
 267                                 return (EADDRINUSE);
 268                         }
 269 #ifdef INET
 270                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 271                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 272                                 struct sockaddr_in sin;
 273
 274                                 in6_sin6_2_sin(&sin, sin6);
 275                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 276                                     lport, lookupflags, cred);
 277                                 if (t && t->inp_flags & INP_TIMEWAIT) {
 278                                         tw = intotw(t);
 279                                         if (tw == NULL)
 280                                                 return (EADDRINUSE);
 281                                         if ((reuseport & tw->tw_so_options) == 0
 282                                             && (ntohl(t->inp_laddr.s_addr) !=
 283                                              INADDR_ANY || ((inp->inp_vflag &
 284                                              INP_IPV6PROTO) ==
 285                                              (t->inp_vflag & INP_IPV6PROTO))))
 286                                                 return (EADDRINUSE);
 287                                 } else if (t &&
 288                                     (reuseport & inp_so_options(t)) == 0 &&
 289                                     (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 290                                     (t->inp_vflag & INP_IPV6PROTO) != 0))
 291                                         return (EADDRINUSE);
 292                         }
 293 #endif
 294                 }
 295                 inp->in6p_laddr = sin6->sin6_addr;
 296         }
 297         if (lport == 0) {
 298                 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
 299                         /* Undo an address bind that may have occurred. */
 300                         inp->in6p_laddr = in6addr_any;
 301                         return (error);
 302                 }
 303         } else {
 304                 inp->inp_lport = lport;
 305                 if (in_pcbinshash(inp) != 0) {
 306                         inp->in6p_laddr = in6addr_any;
 307                         inp->inp_lport = 0;
 308                         return (EAGAIN);
 309                 }
 310         }
 311         return (0);
 312 }
 313
 314 /*
 315  *   Transform old in6_pcbconnect() into an inner subroutine for new
 316  *   in6_pcbconnect(): Do some validity-checking on the remote
 317  *   address (in mbuf 'nam') and then determine local host address
 318  *   (i.e., which interface) to use to access that remote host.
 319  *
 320  *   This preserves definition of in6_pcbconnect(), while supporting a
 321  *   slightly different version for T/TCP.  (This is more than
 322  *   a bit of a kludge, but cleaning up the internal interfaces would
 323  *   have forced minor changes in every protocol).
 324  */
 325 static int
 326 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam,
 327     struct in6_addr *plocal_addr6)
 328 {
 329         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 330         int error = 0;
 331         struct ifnet *ifp = NULL;
 332         int scope_ambiguous = 0;
 333         struct in6_addr in6a;
 334
 335         INP_WLOCK_ASSERT(inp);
 336         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);        /* XXXRW: why? */
 337
 338         if (nam->sa_len != sizeof (*sin6))
 339                 return (EINVAL);
 340         if (sin6->sin6_family != AF_INET6)
 341                 return (EAFNOSUPPORT);
 342         if (sin6->sin6_port == 0)
 343                 return (EADDRNOTAVAIL);
 344
 345         if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 346                 scope_ambiguous = 1;
 347         if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 348                 return(error);
 349
 350         if (!TAILQ_EMPTY(&V_in6_ifaddrhead)) {
 351                 /*
 352                  * If the destination address is UNSPECIFIED addr,
 353                  * use the loopback addr, e.g ::1.
 354                  */
 355                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 356                         sin6->sin6_addr = in6addr_loopback;
 357         }
 358         if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
 359                 return (error);
 360
 361         error = in6_selectsrc(sin6, inp->in6p_outputopts,
 362             inp, NULL, inp->inp_cred, &ifp, &in6a);
 363         if (error)
 364                 return (error);
 365
 366         if (ifp && scope_ambiguous &&
 367             (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
 368                 return(error);
 369         }
 370
 371         /*
 372          * Do not update this earlier, in case we return with an error.
 373          *
 374          * XXX: this in6_selectsrc result might replace the bound local
 375          * address with the address specified by setsockopt(IPV6_PKTINFO).
 376          * Is it the intended behavior?
 377          */
 378         *plocal_addr6 = in6a;
 379
 380         /*
 381          * Don't do pcblookup call here; return interface in
 382          * plocal_addr6
 383          * and exit to caller, that will do the lookup.
 384          */
 385
 386         return (0);
 387 }
 388
 389 /*
 390  * Outer subroutine:
 391  * Connect from a socket to a specified address.
 392  * Both address and port must be specified in argument sin.
 393  * If don't have a local address for this socket yet,
 394  * then pick one.
 395  */
 396 int
 397 in6_pcbconnect_mbuf(register struct inpcb *inp, struct sockaddr *nam,
 398     struct ucred *cred, struct mbuf *m)
 399 {
 400         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 401         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 402         struct in6_addr addr6;
 403         int error;
 404
 405         INP_WLOCK_ASSERT(inp);
 406         INP_HASH_WLOCK_ASSERT(pcbinfo);
 407
 408         /*
 409          * Call inner routine, to assign local interface address.
 410          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 411          */
 412         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 413                 return (error);
 414
 415         if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
 416                                sin6->sin6_port,
 417                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 418                               ? &addr6 : &inp->in6p_laddr,
 419                               inp->inp_lport, 0, NULL) != NULL) {
 420                 return (EADDRINUSE);
 421         }
 422         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 423                 if (inp->inp_lport == 0) {
 424                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
 425                         if (error)
 426                                 return (error);
 427                 }
 428                 inp->in6p_laddr = addr6;
 429         }
 430         inp->in6p_faddr = sin6->sin6_addr;
 431         inp->inp_fport = sin6->sin6_port;
 432         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 433         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 434         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
 435                 inp->inp_flow |=
 436                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 437
 438         in_pcbrehash_mbuf(inp, m);
 439
 440         return (0);
 441 }
 442
 443 int
 444 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 445 {
 446
 447         return (in6_pcbconnect_mbuf(inp, nam, cred, NULL));
 448 }
 449
 450 void
 451 in6_pcbdisconnect(struct inpcb *inp)
 452 {
 453
 454         INP_WLOCK_ASSERT(inp);
 455         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 456
 457         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 458         inp->inp_fport = 0;
 459         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 460         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 461         in_pcbrehash(inp);
 462 }
 463
 464 struct sockaddr *
 465 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
 466 {
 467         struct sockaddr_in6 *sin6;
 468
 469         sin6 = malloc(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(in_port_t port, struct in_addr *addr_p)
 482 {
 483         struct sockaddr_in sin;
 484         struct sockaddr_in6 *sin6_p;
 485
 486         bzero(&sin, sizeof sin);
 487         sin.sin_family = AF_INET;
 488         sin.sin_len = sizeof(sin);
 489         sin.sin_port = port;
 490         sin.sin_addr = *addr_p;
 491
 492         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
 493                 M_WAITOK);
 494         in6_sin_2_v4mapsin6(&sin, sin6_p);
 495
 496         return (struct sockaddr *)sin6_p;
 497 }
 498
 499 int
 500 in6_getsockaddr(struct socket *so, struct sockaddr **nam)
 501 {
 502         register struct inpcb *inp;
 503         struct in6_addr addr;
 504         in_port_t port;
 505
 506         inp = sotoinpcb(so);
 507         KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
 508
 509         INP_RLOCK(inp);
 510         port = inp->inp_lport;
 511         addr = inp->in6p_laddr;
 512         INP_RUNLOCK(inp);
 513
 514         *nam = in6_sockaddr(port, &addr);
 515         return 0;
 516 }
 517
 518 int
 519 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 520 {
 521         struct inpcb *inp;
 522         struct in6_addr addr;
 523         in_port_t port;
 524
 525         inp = sotoinpcb(so);
 526         KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
 527
 528         INP_RLOCK(inp);
 529         port = inp->inp_fport;
 530         addr = inp->in6p_faddr;
 531         INP_RUNLOCK(inp);
 532
 533         *nam = in6_sockaddr(port, &addr);
 534         return 0;
 535 }
 536
 537 int
 538 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 539 {
 540         struct  inpcb *inp;
 541         int     error;
 542
 543         inp = sotoinpcb(so);
 544         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
 545
 546 #ifdef INET
 547         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 548                 error = in_getsockaddr(so, nam);
 549                 if (error == 0)
 550                         in6_sin_2_v4mapsin6_in_sock(nam);
 551         } else
 552 #endif
 553         {
 554                 /* scope issues will be handled in in6_getsockaddr(). */
 555                 error = in6_getsockaddr(so, nam);
 556         }
 557
 558         return error;
 559 }
 560
 561 int
 562 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 563 {
 564         struct  inpcb *inp;
 565         int     error;
 566
 567         inp = sotoinpcb(so);
 568         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
 569
 570 #ifdef INET
 571         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 572                 error = in_getpeeraddr(so, nam);
 573                 if (error == 0)
 574                         in6_sin_2_v4mapsin6_in_sock(nam);
 575         } else
 576 #endif
 577         /* scope issues will be handled in in6_getpeeraddr(). */
 578         error = in6_getpeeraddr(so, nam);
 579
 580         return error;
 581 }
 582
 583 /*
 584  * Pass some notification to all connections of a protocol
 585  * associated with address dst.  The local address and/or port numbers
 586  * may be specified to limit the search.  The "usual action" will be
 587  * taken, depending on the ctlinput cmd.  The caller must filter any
 588  * cmds that are uninteresting (e.g., no error in the map).
 589  * Call the protocol specific routine (if any) to report
 590  * any errors for each matching socket.
 591  */
 592 void
 593 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
 594     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
 595     int cmd, void *cmdarg,
 596     struct inpcb *(*notify)(struct inpcb *, int))
 597 {
 598         struct inpcb *inp, *inp_temp;
 599         struct sockaddr_in6 sa6_src, *sa6_dst;
 600         u_short fport = fport_arg, lport = lport_arg;
 601         u_int32_t flowinfo;
 602         int errno;
 603
 604         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 605                 return;
 606
 607         sa6_dst = (struct sockaddr_in6 *)dst;
 608         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 609                 return;
 610
 611         /*
 612          * note that src can be NULL when we get notify by local fragmentation.
 613          */
 614         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 615         flowinfo = sa6_src.sin6_flowinfo;
 616
 617         /*
 618          * Redirects go to all references to the destination,
 619          * and use in6_rtchange to invalidate the route cache.
 620          * Dead host indications: also use in6_rtchange to invalidate
 621          * the cache, and deliver the error to all the sockets.
 622          * Otherwise, if we have knowledge of the local port and address,
 623          * deliver only to that socket.
 624          */
 625         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 626                 fport = 0;
 627                 lport = 0;
 628                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 629
 630                 if (cmd != PRC_HOSTDEAD)
 631                         notify = in6_rtchange;
 632         }
 633         errno = inet6ctlerrmap[cmd];
 634         INP_INFO_WLOCK(pcbinfo);
 635         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
 636                 INP_WLOCK(inp);
 637                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 638                         INP_WUNLOCK(inp);
 639                         continue;
 640                 }
 641
 642                 /*
 643                  * If the error designates a new path MTU for a destination
 644                  * and the application (associated with this socket) wanted to
 645                  * know the value, notify. Note that we notify for all
 646                  * disconnected sockets if the corresponding application
 647                  * wanted. This is because some UDP applications keep sending
 648                  * sockets disconnected.
 649                  * XXX: should we avoid to notify the value to TCP sockets?
 650                  */
 651                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
 652                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 653                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
 654                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
 655                                         (u_int32_t *)cmdarg);
 656                 }
 657
 658                 /*
 659                  * Detect if we should notify the error. If no source and
 660                  * destination ports are specifed, but non-zero flowinfo and
 661                  * local address match, notify the error. This is the case
 662                  * when the error is delivered with an encrypted buffer
 663                  * by ESP. Otherwise, just compare addresses and ports
 664                  * as usual.
 665                  */
 666                 if (lport == 0 && fport == 0 && flowinfo &&
 667                     inp->inp_socket != NULL &&
 668                     flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
 669                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 670                         goto do_notify;
 671                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 672                                              &sa6_dst->sin6_addr) ||
 673                          inp->inp_socket == 0 ||
 674                          (lport && inp->inp_lport != lport) ||
 675                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 676                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 677                                               &sa6_src.sin6_addr)) ||
 678                          (fport && inp->inp_fport != fport)) {
 679                         INP_WUNLOCK(inp);
 680                         continue;
 681                 }
 682
 683           do_notify:
 684                 if (notify) {
 685                         if ((*notify)(inp, errno))
 686                                 INP_WUNLOCK(inp);
 687                 } else
 688                         INP_WUNLOCK(inp);
 689         }
 690         INP_INFO_WUNLOCK(pcbinfo);
 691 }
 692
 693 /*
 694  * Lookup a PCB based on the local address and port.  Caller must hold the
 695  * hash lock.  No inpcb locks or references are acquired.
 696  */
 697 struct inpcb *
 698 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
 699     u_short lport, int lookupflags, struct ucred *cred)
 700 {
 701         register struct inpcb *inp;
 702         int matchwild = 3, wildcard;
 703
 704         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 705             ("%s: invalid lookup flags %d", __func__, lookupflags));
 706
 707         INP_HASH_WLOCK_ASSERT(pcbinfo);
 708
 709         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
 710                 struct inpcbhead *head;
 711                 /*
 712                  * Look for an unconnected (wildcard foreign addr) PCB that
 713                  * matches the local address and port we're looking for.
 714                  */
 715                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
 716                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
 717                     pcbinfo->ipi_hashmask)];
 718                 LIST_FOREACH(inp, head, inp_hash) {
 719                         /* XXX inp locking */
 720                         if ((inp->inp_vflag & INP_IPV6) == 0)
 721                                 continue;
 722                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 723                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 724                             inp->inp_lport == lport) {
 725                                 /* Found. */
 726                                 if (cred == NULL ||
 727                                     prison_equal_ip6(cred->cr_prison,
 728                                         inp->inp_cred->cr_prison))
 729                                         return (inp);
 730                         }
 731                 }
 732                 /*
 733                  * Not found.
 734                  */
 735                 return (NULL);
 736         } else {
 737                 struct inpcbporthead *porthash;
 738                 struct inpcbport *phd;
 739                 struct inpcb *match = NULL;
 740                 /*
 741                  * Best fit PCB lookup.
 742                  *
 743                  * First see if this local port is in use by looking on the
 744                  * port hash list.
 745                  */
 746                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 747                     pcbinfo->ipi_porthashmask)];
 748                 LIST_FOREACH(phd, porthash, phd_hash) {
 749                         if (phd->phd_port == lport)
 750                                 break;
 751                 }
 752                 if (phd != NULL) {
 753                         /*
 754                          * Port is in use by one or more PCBs. Look for best
 755                          * fit.
 756                          */
 757                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 758                                 wildcard = 0;
 759                                 if (cred != NULL &&
 760                                     !prison_equal_ip6(cred->cr_prison,
 761                                         inp->inp_cred->cr_prison))
 762                                         continue;
 763                                 /* XXX inp locking */
 764                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 765                                         continue;
 766                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 767                                         wildcard++;
 768                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 769                                         &inp->in6p_laddr)) {
 770                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 771                                                 wildcard++;
 772                                         else if (!IN6_ARE_ADDR_EQUAL(
 773                                             &inp->in6p_laddr, laddr))
 774                                                 continue;
 775                                 } else {
 776                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 777                                                 wildcard++;
 778                                 }
 779                                 if (wildcard < matchwild) {
 780                                         match = inp;
 781                                         matchwild = wildcard;
 782                                         if (matchwild == 0)
 783                                                 break;
 784                                 }
 785                         }
 786                 }
 787                 return (match);
 788         }
 789 }
 790
 791 void
 792 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 793 {
 794         struct inpcb *in6p;
 795         struct ip6_moptions *im6o;
 796         int i, gap;
 797
 798         INP_INFO_RLOCK(pcbinfo);
 799         LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
 800                 INP_WLOCK(in6p);
 801                 im6o = in6p->in6p_moptions;
 802                 if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) {
 803                         /*
 804                          * Unselect the outgoing ifp for multicast if it
 805                          * is being detached.
 806                          */
 807                         if (im6o->im6o_multicast_ifp == ifp)
 808                                 im6o->im6o_multicast_ifp = NULL;
 809                         /*
 810                          * Drop multicast group membership if we joined
 811                          * through the interface being detached.
 812                          */
 813                         gap = 0;
 814                         for (i = 0; i < im6o->im6o_num_memberships; i++) {
 815                                 if (im6o->im6o_membership[i]->in6m_ifp ==
 816                                     ifp) {
 817                                         in6_mc_leave(im6o->im6o_membership[i],
 818                                             NULL);
 819                                         gap++;
 820                                 } else if (gap != 0) {
 821                                         im6o->im6o_membership[i - gap] =
 822                                             im6o->im6o_membership[i];
 823                                 }
 824                         }
 825                         im6o->im6o_num_memberships -= gap;
 826                 }
 827                 INP_WUNLOCK(in6p);
 828         }
 829         INP_INFO_RUNLOCK(pcbinfo);
 830 }
 831
 832 /*
 833  * Check for alternatives when higher level complains
 834  * about service problems.  For now, invalidate cached
 835  * routing information.  If the route was created dynamically
 836  * (by a redirect), time to try a default gateway again.
 837  */
 838 void
 839 in6_losing(struct inpcb *in6p)
 840 {
 841
 842         /*
 843          * We don't store route pointers in the routing table anymore
 844          */
 845         return;
 846 }
 847
 848 /*
 849  * After a routing change, flush old routing
 850  * and allocate a (hopefully) better one.
 851  */
 852 struct inpcb *
 853 in6_rtchange(struct inpcb *inp, int errno)
 854 {
 855         /*
 856          * We don't store route pointers in the routing table anymore
 857          */
 858         return inp;
 859 }
 860
 861 #ifdef PCBGROUP
 862 /*
 863  * Lookup PCB in hash list, using pcbgroup tables.
 864  */
 865 static struct inpcb *
 866 in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
 867     struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
 868     u_int lport_arg, int lookupflags, struct ifnet *ifp)
 869 {
 870         struct inpcbhead *head;
 871         struct inpcb *inp, *tmpinp;
 872         u_short fport = fport_arg, lport = lport_arg;
 873
 874         /*
 875          * First look for an exact match.
 876          */
 877         tmpinp = NULL;
 878         INP_GROUP_LOCK(pcbgroup);
 879         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(
 880             INP6_PCBHASHKEY(faddr), lport, fport, pcbgroup->ipg_hashmask)];
 881         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 882                 /* XXX inp locking */
 883                 if ((inp->inp_vflag & INP_IPV6) == 0)
 884                         continue;
 885                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 886                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 887                     inp->inp_fport == fport &&
 888                     inp->inp_lport == lport) {
 889                         /*
 890                          * XXX We should be able to directly return
 891                          * the inp here, without any checks.
 892                          * Well unless both bound with SO_REUSEPORT?
 893                          */
 894                         if (prison_flag(inp->inp_cred, PR_IP6))
 895                                 goto found;
 896                         if (tmpinp == NULL)
 897                                 tmpinp = inp;
 898                 }
 899         }
 900         if (tmpinp != NULL) {
 901                 inp = tmpinp;
 902                 goto found;
 903         }
 904
 905         /*
 906          * Then look for a wildcard match in the pcbgroup.
 907          */
 908         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 909                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 910                 struct inpcb *jail_wild = NULL;
 911                 int injail;
 912
 913                 /*
 914                  * Order of socket selection - we always prefer jails.
 915                  *      1. jailed, non-wild.
 916                  *      2. jailed, wild.
 917                  *      3. non-jailed, non-wild.
 918                  *      4. non-jailed, wild.
 919                  */
 920                 head = &pcbgroup->ipg_hashbase[
 921                     INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
 922                 LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 923                         /* XXX inp locking */
 924                         if ((inp->inp_vflag & INP_IPV6) == 0)
 925                                 continue;
 926
 927                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 928                             inp->inp_lport != lport) {
 929                                 continue;
 930                         }
 931
 932                         injail = prison_flag(inp->inp_cred, PR_IP6);
 933                         if (injail) {
 934                                 if (prison_check_ip6(inp->inp_cred,
 935                                     laddr) != 0)
 936                                         continue;
 937                         } else {
 938                                 if (local_exact != NULL)
 939                                         continue;
 940                         }
 941
 942                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
 943                                 if (injail)
 944                                         goto found;
 945                                 else
 946                                         local_exact = inp;
 947                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 948                                 if (injail)
 949                                         jail_wild = inp;
 950                                 else
 951                                         local_wild = inp;
 952                         }
 953                 } /* LIST_FOREACH */
 954
 955                 inp = jail_wild;
 956                 if (inp == NULL)
 957                         inp = jail_wild;
 958                 if (inp == NULL)
 959                         inp = local_exact;
 960                 if (inp == NULL)
 961                         inp = local_wild;
 962                 if (inp != NULL)
 963                         goto found;
 964         }
 965
 966         /*
 967          * Then look for a wildcard match, if requested.
 968          */
 969         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 970                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 971                 struct inpcb *jail_wild = NULL;
 972                 int injail;
 973
 974                 /*
 975                  * Order of socket selection - we always prefer jails.
 976                  *      1. jailed, non-wild.
 977                  *      2. jailed, wild.
 978                  *      3. non-jailed, non-wild.
 979                  *      4. non-jailed, wild.
 980                  */
 981                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(
 982                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
 983                     pcbinfo->ipi_wildmask)];
 984                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
 985                         /* XXX inp locking */
 986                         if ((inp->inp_vflag & INP_IPV6) == 0)
 987                                 continue;
 988
 989                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 990                             inp->inp_lport != lport) {
 991                                 continue;
 992                         }
 993
 994                         injail = prison_flag(inp->inp_cred, PR_IP6);
 995                         if (injail) {
 996                                 if (prison_check_ip6(inp->inp_cred,
 997                                     laddr) != 0)
 998                                         continue;
 999                         } else {
1000                                 if (local_exact != NULL)
1001                                         continue;
1002                         }
1003
1004                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1005                                 if (injail)
1006                                         goto found;
1007                                 else
1008                                         local_exact = inp;
1009                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1010                                 if (injail)
1011                                         jail_wild = inp;
1012                                 else
1013                                         local_wild = inp;
1014                         }
1015                 } /* LIST_FOREACH */
1016
1017                 inp = jail_wild;
1018                 if (inp == NULL)
1019                         inp = jail_wild;
1020                 if (inp == NULL)
1021                         inp = local_exact;
1022                 if (inp == NULL)
1023                         inp = local_wild;
1024                 if (inp != NULL)
1025                         goto found;
1026         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1027         INP_GROUP_UNLOCK(pcbgroup);
1028         return (NULL);
1029
1030 found:
1031         in_pcbref(inp);
1032         INP_GROUP_UNLOCK(pcbgroup);
1033         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1034                 INP_WLOCK(inp);
1035                 if (in_pcbrele_wlocked(inp))
1036                         return (NULL);
1037         } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1038                 INP_RLOCK(inp);
1039                 if (in_pcbrele_rlocked(inp))
1040                         return (NULL);
1041         } else
1042                 panic("%s: locking buf", __func__);
1043         return (inp);
1044 }
1045 #endif /* PCBGROUP */
1046
1047 /*
1048  * Lookup PCB in hash list.
1049  */
1050 static struct inpcb *
1051 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1052     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1053     int lookupflags, struct ifnet *ifp)
1054 {
1055         struct inpcbhead *head;
1056         struct inpcb *inp, *tmpinp;
1057         u_short fport = fport_arg, lport = lport_arg;
1058
1059         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1060             ("%s: invalid lookup flags %d", __func__, lookupflags));
1061
1062         INP_HASH_LOCK_ASSERT(pcbinfo);
1063
1064         /*
1065          * First look for an exact match.
1066          */
1067         tmpinp = NULL;
1068         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1069             INP6_PCBHASHKEY(faddr), lport, fport, pcbinfo->ipi_hashmask)];
1070         LIST_FOREACH(inp, head, inp_hash) {
1071                 /* XXX inp locking */
1072                 if ((inp->inp_vflag & INP_IPV6) == 0)
1073                         continue;
1074                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1075                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1076                     inp->inp_fport == fport &&
1077                     inp->inp_lport == lport) {
1078                         /*
1079                          * XXX We should be able to directly return
1080                          * the inp here, without any checks.
1081                          * Well unless both bound with SO_REUSEPORT?
1082                          */
1083                         if (prison_flag(inp->inp_cred, PR_IP6))
1084                                 return (inp);
1085                         if (tmpinp == NULL)
1086                                 tmpinp = inp;
1087                 }
1088         }
1089         if (tmpinp != NULL)
1090                 return (tmpinp);
1091
1092         /*
1093          * Then look for a wildcard match, if requested.
1094          */
1095         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1096                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1097                 struct inpcb *jail_wild = NULL;
1098                 int injail;
1099
1100                 /*
1101                  * Order of socket selection - we always prefer jails.
1102                  *      1. jailed, non-wild.
1103                  *      2. jailed, wild.
1104                  *      3. non-jailed, non-wild.
1105                  *      4. non-jailed, wild.
1106                  */
1107                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1108                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
1109                     pcbinfo->ipi_hashmask)];
1110                 LIST_FOREACH(inp, head, inp_hash) {
1111                         /* XXX inp locking */
1112                         if ((inp->inp_vflag & INP_IPV6) == 0)
1113                                 continue;
1114
1115                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1116                             inp->inp_lport != lport) {
1117                                 continue;
1118                         }
1119
1120                         injail = prison_flag(inp->inp_cred, PR_IP6);
1121                         if (injail) {
1122                                 if (prison_check_ip6(inp->inp_cred,
1123                                     laddr) != 0)
1124                                         continue;
1125                         } else {
1126                                 if (local_exact != NULL)
1127                                         continue;
1128                         }
1129
1130                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1131                                 if (injail)
1132                                         return (inp);
1133                                 else
1134                                         local_exact = inp;
1135                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1136                                 if (injail)
1137                                         jail_wild = inp;
1138                                 else
1139                                         local_wild = inp;
1140                         }
1141                 } /* LIST_FOREACH */
1142
1143                 if (jail_wild != NULL)
1144                         return (jail_wild);
1145                 if (local_exact != NULL)
1146                         return (local_exact);
1147                 if (local_wild != NULL)
1148                         return (local_wild);
1149         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1150
1151         /*
1152          * Not found.
1153          */
1154         return (NULL);
1155 }
1156
1157 /*
1158  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1159  * hash list lock, and will return the inpcb locked (i.e., requires
1160  * INPLOOKUP_LOCKPCB).
1161  */
1162 static struct inpcb *
1163 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1164     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1165     struct ifnet *ifp)
1166 {
1167         struct inpcb *inp;
1168
1169         INP_HASH_RLOCK(pcbinfo);
1170         inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1171             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1172         if (inp != NULL) {
1173                 in_pcbref(inp);
1174                 INP_HASH_RUNLOCK(pcbinfo);
1175                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1176                         INP_WLOCK(inp);
1177                         if (in_pcbrele_wlocked(inp))
1178                                 return (NULL);
1179                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1180                         INP_RLOCK(inp);
1181                         if (in_pcbrele_rlocked(inp))
1182                                 return (NULL);
1183                 } else
1184                         panic("%s: locking bug", __func__);
1185         } else
1186                 INP_HASH_RUNLOCK(pcbinfo);
1187         return (inp);
1188 }
1189
1190 /*
1191  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1192  * from which a pre-calculated hash value may be extracted.
1193  *
1194  * Possibly more of this logic should be in in6_pcbgroup.c.
1195  */
1196 struct inpcb *
1197 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
1198     struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1199 {
1200 #if defined(PCBGROUP) && !defined(RSS)
1201         struct inpcbgroup *pcbgroup;
1202 #endif
1203
1204         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1205             ("%s: invalid lookup flags %d", __func__, lookupflags));
1206         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1207             ("%s: LOCKPCB not set", __func__));
1208
1209         /*
1210          * When not using RSS, use connection groups in preference to the
1211          * reservation table when looking up 4-tuples.  When using RSS, just
1212          * use the reservation table, due to the cost of the Toeplitz hash
1213          * in software.
1214          *
1215          * XXXRW: This policy belongs in the pcbgroup code, as in principle
1216          * we could be doing RSS with a non-Toeplitz hash that is affordable
1217          * in software.
1218          */
1219 #if defined(PCBGROUP) && !defined(RSS)
1220         if (in_pcbgroup_enabled(pcbinfo)) {
1221                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1222                     fport);
1223                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1224                     laddr, lport, lookupflags, ifp));
1225         }
1226 #endif
1227         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1228             lookupflags, ifp));
1229 }
1230
1231 struct inpcb *
1232 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1233     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1234     struct ifnet *ifp, struct mbuf *m)
1235 {
1236 #ifdef PCBGROUP
1237         struct inpcbgroup *pcbgroup;
1238 #endif
1239
1240         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1241             ("%s: invalid lookup flags %d", __func__, lookupflags));
1242         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1243             ("%s: LOCKPCB not set", __func__));
1244
1245 #ifdef PCBGROUP
1246         /*
1247          * If we can use a hardware-generated hash to look up the connection
1248          * group, use that connection group to find the inpcb.  Otherwise
1249          * fall back on a software hash -- or the reservation table if we're
1250          * using RSS.
1251          *
1252          * XXXRW: As above, that policy belongs in the pcbgroup code.
1253          */
1254         if (in_pcbgroup_enabled(pcbinfo) &&
1255             M_HASHTYPE_TEST(m, M_HASHTYPE_NONE) == 0) {
1256                 pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1257                     m->m_pkthdr.flowid);
1258                 if (pcbgroup != NULL)
1259                         return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
1260                             fport, laddr, lport, lookupflags, ifp));
1261 #ifndef RSS
1262                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1263                     fport);
1264                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1265                     laddr, lport, lookupflags, ifp));
1266 #endif
1267         }
1268 #endif
1269         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1270             lookupflags, ifp));
1271 }
1272
1273 void
1274 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1275 {
1276         struct ip6_hdr *ip;
1277
1278         ip = mtod(m, struct ip6_hdr *);
1279         bzero(sin6, sizeof(*sin6));
1280         sin6->sin6_len = sizeof(*sin6);
1281         sin6->sin6_family = AF_INET6;
1282         sin6->sin6_addr = ip->ip6_src;
1283
1284         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
1285
1286         return;
1287 }