sys/netinet6/in6_pcb.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * Copyright (c) 2010-2011 Juniper Networks, Inc.
   6  * All rights reserved.
   7  *
   8  * Portions of this software were developed by Robert N. M. Watson under
   9  * contract to Juniper Networks, Inc.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the project nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  *      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
  36  */
  37
  38 /*-
  39  * Copyright (c) 1982, 1986, 1991, 1993
  40  *      The Regents of the University of California.  All rights reserved.
  41  *
  42  * Redistribution and use in source and binary forms, with or without
  43  * modification, are permitted provided that the following conditions
  44  * are met:
  45  * 1. Redistributions of source code must retain the above copyright
  46  *    notice, this list of conditions and the following disclaimer.
  47  * 2. Redistributions in binary form must reproduce the above copyright
  48  *    notice, this list of conditions and the following disclaimer in the
  49  *    documentation and/or other materials provided with the distribution.
  50  * 3. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
  67  */
  68
  69 #include <sys/cdefs.h>
  70 __FBSDID("$FreeBSD$");
  71
  72 #include "opt_inet.h"
  73 #include "opt_inet6.h"
  74 #include "opt_ipsec.h"
  75 #include "opt_pcbgroup.h"
  76 #include "opt_rss.h"
  77
  78 #include <sys/param.h>
  79 #include <sys/systm.h>
  80 #include <sys/malloc.h>
  81 #include <sys/mbuf.h>
  82 #include <sys/domain.h>
  83 #include <sys/protosw.h>
  84 #include <sys/socket.h>
  85 #include <sys/socketvar.h>
  86 #include <sys/sockio.h>
  87 #include <sys/errno.h>
  88 #include <sys/time.h>
  89 #include <sys/priv.h>
  90 #include <sys/proc.h>
  91 #include <sys/jail.h>
  92
  93 #include <vm/uma.h>
  94
  95 #include <net/if.h>
  96 #include <net/if_var.h>
  97 #include <net/if_llatbl.h>
  98 #include <net/if_types.h>
  99 #include <net/route.h>
 100
 101 #include <netinet/in.h>
 102 #include <netinet/in_var.h>
 103 #include <netinet/in_systm.h>
 104 #include <netinet/tcp_var.h>
 105 #include <netinet/ip6.h>
 106 #include <netinet/ip_var.h>
 107
 108 #include <netinet6/ip6_var.h>
 109 #include <netinet6/nd6.h>
 110 #include <netinet/in_pcb.h>
 111 #include <netinet6/in6_pcb.h>
 112 #include <netinet6/scope6_var.h>
 113
 114 static struct inpcb *in6_pcblookup_hash_locked(struct inpcbinfo *,
 115     struct in6_addr *, u_int, struct in6_addr *, u_int, int, struct ifnet *);
 116
 117 int
 118 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam,
 119     struct ucred *cred)
 120 {
 121         struct socket *so = inp->inp_socket;
 122         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
 123         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 124         u_short lport = 0;
 125         int error, lookupflags = 0;
 126         int reuseport = (so->so_options & SO_REUSEPORT);
 127
 128         /*
 129          * XXX: Maybe we could let SO_REUSEPORT_LB set SO_REUSEPORT bit here
 130          * so that we don't have to add to the (already messy) code below.
 131          */
 132         int reuseport_lb = (so->so_options & SO_REUSEPORT_LB);
 133
 134         INP_WLOCK_ASSERT(inp);
 135         INP_HASH_WLOCK_ASSERT(pcbinfo);
 136
 137         if (CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) /* XXX broken! */
 138                 return (EADDRNOTAVAIL);
 139         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 140                 return (EINVAL);
 141         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT|SO_REUSEPORT_LB)) == 0)
 142                 lookupflags = INPLOOKUP_WILDCARD;
 143         if (nam == NULL) {
 144                 if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
 145                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
 146                         return (error);
 147         } else {
 148                 sin6 = (struct sockaddr_in6 *)nam;
 149                 if (nam->sa_len != sizeof(*sin6))
 150                         return (EINVAL);
 151                 /*
 152                  * family check.
 153                  */
 154                 if (nam->sa_family != AF_INET6)
 155                         return (EAFNOSUPPORT);
 156
 157                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 158                         return(error);
 159
 160                 if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
 161                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
 162                         return (error);
 163
 164                 lport = sin6->sin6_port;
 165                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 166                         /*
 167                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 168                          * allow compepte duplication of binding if
 169                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 170                          * and a multicast address is bound on both
 171                          * new and duplicated sockets.
 172                          */
 173                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
 174                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 175                         /*
 176                          * XXX: How to deal with SO_REUSEPORT_LB here?
 177                          * Treat same as SO_REUSEPORT for now.
 178                          */
 179                         if ((so->so_options &
 180                             (SO_REUSEADDR|SO_REUSEPORT_LB)) != 0)
 181                                 reuseport_lb = SO_REUSEADDR|SO_REUSEPORT_LB;
 182                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 183                         struct epoch_tracker et;
 184                         struct ifaddr *ifa;
 185
 186                         sin6->sin6_port = 0;            /* yech... */
 187                         NET_EPOCH_ENTER(et);
 188                         if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
 189                             NULL &&
 190                             (inp->inp_flags & INP_BINDANY) == 0) {
 191                                 NET_EPOCH_EXIT(et);
 192                                 return (EADDRNOTAVAIL);
 193                         }
 194
 195                         /*
 196                          * XXX: bind to an anycast address might accidentally
 197                          * cause sending a packet with anycast source address.
 198                          * We should allow to bind to a deprecated address, since
 199                          * the application dares to use it.
 200                          */
 201                         if (ifa != NULL &&
 202                             ((struct in6_ifaddr *)ifa)->ia6_flags &
 203                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 204                                 NET_EPOCH_EXIT(et);
 205                                 return (EADDRNOTAVAIL);
 206                         }
 207                         NET_EPOCH_EXIT(et);
 208                 }
 209                 if (lport) {
 210                         struct inpcb *t;
 211                         struct tcptw *tw;
 212
 213                         /* GROSS */
 214                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 215                             ntohs(lport) >= V_ipport_reservedlow &&
 216                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT))
 217                                 return (EACCES);
 218                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
 219                             priv_check_cred(inp->inp_cred, PRIV_NETINET_REUSEPORT) != 0) {
 220                                 t = in6_pcblookup_local(pcbinfo,
 221                                     &sin6->sin6_addr, lport,
 222                                     INPLOOKUP_WILDCARD, cred);
 223                                 if (t &&
 224                                     ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 225                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 226                                     (so->so_type != SOCK_STREAM ||
 227                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
 228                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 229                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 230                                      (t->inp_flags2 & INP_REUSEPORT) ||
 231                                      (t->inp_flags2 & INP_REUSEPORT_LB) == 0) &&
 232                                     (inp->inp_cred->cr_uid !=
 233                                      t->inp_cred->cr_uid))
 234                                         return (EADDRINUSE);
 235
 236                                 /*
 237                                  * If the socket is a BINDMULTI socket, then
 238                                  * the credentials need to match and the
 239                                  * original socket also has to have been bound
 240                                  * with BINDMULTI.
 241                                  */
 242                                 if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 243                                         return (EADDRINUSE);
 244
 245 #ifdef INET
 246                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 247                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 248                                         struct sockaddr_in sin;
 249
 250                                         in6_sin6_2_sin(&sin, sin6);
 251                                         t = in_pcblookup_local(pcbinfo,
 252                                             sin.sin_addr, lport,
 253                                             INPLOOKUP_WILDCARD, cred);
 254                                         if (t &&
 255                                             ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 256                                             ((t->inp_flags &
 257                                               INP_TIMEWAIT) == 0) &&
 258                                             (so->so_type != SOCK_STREAM ||
 259                                              ntohl(t->inp_faddr.s_addr) ==
 260                                               INADDR_ANY) &&
 261                                             (inp->inp_cred->cr_uid !=
 262                                              t->inp_cred->cr_uid))
 263                                                 return (EADDRINUSE);
 264
 265                                         if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 266                                                 return (EADDRINUSE);
 267                                 }
 268 #endif
 269                         }
 270                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 271                             lport, lookupflags, cred);
 272                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 273                                 /*
 274                                  * XXXRW: If an incpb has had its timewait
 275                                  * state recycled, we treat the address as
 276                                  * being in use (for now).  This is better
 277                                  * than a panic, but not desirable.
 278                                  */
 279                                 tw = intotw(t);
 280                                 if (tw == NULL ||
 281                                     ((reuseport & tw->tw_so_options) == 0 &&
 282                                          (reuseport_lb & tw->tw_so_options) == 0))
 283                                         return (EADDRINUSE);
 284                         } else if (t && (reuseport & inp_so_options(t)) == 0 &&
 285                                            (reuseport_lb & inp_so_options(t)) == 0) {
 286                                 return (EADDRINUSE);
 287                         }
 288 #ifdef INET
 289                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 290                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 291                                 struct sockaddr_in sin;
 292
 293                                 in6_sin6_2_sin(&sin, sin6);
 294                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 295                                    lport, lookupflags, cred);
 296                                 if (t && t->inp_flags & INP_TIMEWAIT) {
 297                                         tw = intotw(t);
 298                                         if (tw == NULL)
 299                                                 return (EADDRINUSE);
 300                                         if ((reuseport & tw->tw_so_options) == 0
 301                                             && (reuseport_lb & tw->tw_so_options) == 0
 302                                             && (ntohl(t->inp_laddr.s_addr) !=
 303                                                 INADDR_ANY || ((inp->inp_vflag &
 304                                                         INP_IPV6PROTO) ==
 305                                                     (t->inp_vflag & INP_IPV6PROTO))))
 306                                                 return (EADDRINUSE);
 307                                 } else if (t &&
 308                                     (reuseport & inp_so_options(t)) == 0 &&
 309                                     (reuseport_lb & inp_so_options(t)) == 0 &&
 310                                     (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 311                                         (t->inp_vflag & INP_IPV6PROTO) != 0)) {
 312                                         return (EADDRINUSE);
 313                                 }
 314                         }
 315 #endif
 316                 }
 317                 inp->in6p_laddr = sin6->sin6_addr;
 318         }
 319         if (lport == 0) {
 320                 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
 321                         /* Undo an address bind that may have occurred. */
 322                         inp->in6p_laddr = in6addr_any;
 323                         return (error);
 324                 }
 325         } else {
 326                 inp->inp_lport = lport;
 327                 if (in_pcbinshash(inp) != 0) {
 328                         inp->in6p_laddr = in6addr_any;
 329                         inp->inp_lport = 0;
 330                         return (EAGAIN);
 331                 }
 332         }
 333         return (0);
 334 }
 335
 336 /*
 337  *   Transform old in6_pcbconnect() into an inner subroutine for new
 338  *   in6_pcbconnect(): Do some validity-checking on the remote
 339  *   address (in mbuf 'nam') and then determine local host address
 340  *   (i.e., which interface) to use to access that remote host.
 341  *
 342  *   This preserves definition of in6_pcbconnect(), while supporting a
 343  *   slightly different version for T/TCP.  (This is more than
 344  *   a bit of a kludge, but cleaning up the internal interfaces would
 345  *   have forced minor changes in every protocol).
 346  */
 347 static int
 348 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 349     struct in6_addr *plocal_addr6)
 350 {
 351         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 352         int error = 0;
 353         int scope_ambiguous = 0;
 354         struct in6_addr in6a;
 355
 356         INP_WLOCK_ASSERT(inp);
 357         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);        /* XXXRW: why? */
 358
 359         if (nam->sa_len != sizeof (*sin6))
 360                 return (EINVAL);
 361         if (sin6->sin6_family != AF_INET6)
 362                 return (EAFNOSUPPORT);
 363         if (sin6->sin6_port == 0)
 364                 return (EADDRNOTAVAIL);
 365
 366         if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 367                 scope_ambiguous = 1;
 368         if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 369                 return(error);
 370
 371         if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) {
 372                 /*
 373                  * If the destination address is UNSPECIFIED addr,
 374                  * use the loopback addr, e.g ::1.
 375                  */
 376                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 377                         sin6->sin6_addr = in6addr_loopback;
 378         }
 379         if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
 380                 return (error);
 381
 382         error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
 383             inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
 384         if (error)
 385                 return (error);
 386
 387         /*
 388          * Do not update this earlier, in case we return with an error.
 389          *
 390          * XXX: this in6_selectsrc_socket result might replace the bound local
 391          * address with the address specified by setsockopt(IPV6_PKTINFO).
 392          * Is it the intended behavior?
 393          */
 394         *plocal_addr6 = in6a;
 395
 396         /*
 397          * Don't do pcblookup call here; return interface in
 398          * plocal_addr6
 399          * and exit to caller, that will do the lookup.
 400          */
 401
 402         return (0);
 403 }
 404
 405 /*
 406  * Outer subroutine:
 407  * Connect from a socket to a specified address.
 408  * Both address and port must be specified in argument sin.
 409  * If don't have a local address for this socket yet,
 410  * then pick one.
 411  */
 412 int
 413 in6_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
 414     struct ucred *cred, struct mbuf *m)
 415 {
 416         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 417         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 418         struct in6_addr addr6;
 419         int error;
 420
 421         INP_WLOCK_ASSERT(inp);
 422         INP_HASH_WLOCK_ASSERT(pcbinfo);
 423
 424         /*
 425          * Call inner routine, to assign local interface address.
 426          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 427          */
 428         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 429                 return (error);
 430
 431         if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
 432                                sin6->sin6_port,
 433                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 434                               ? &addr6 : &inp->in6p_laddr,
 435                               inp->inp_lport, 0, NULL) != NULL) {
 436                 return (EADDRINUSE);
 437         }
 438         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 439                 if (inp->inp_lport == 0) {
 440                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
 441                         if (error)
 442                                 return (error);
 443                 }
 444                 inp->in6p_laddr = addr6;
 445         }
 446         inp->in6p_faddr = sin6->sin6_addr;
 447         inp->inp_fport = sin6->sin6_port;
 448         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 449         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 450         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
 451                 inp->inp_flow |=
 452                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 453
 454         in_pcbrehash_mbuf(inp, m);
 455
 456         return (0);
 457 }
 458
 459 int
 460 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 461 {
 462
 463         return (in6_pcbconnect_mbuf(inp, nam, cred, NULL));
 464 }
 465
 466 void
 467 in6_pcbdisconnect(struct inpcb *inp)
 468 {
 469
 470         INP_WLOCK_ASSERT(inp);
 471         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 472
 473         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 474         inp->inp_fport = 0;
 475         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 476         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 477         in_pcbrehash(inp);
 478 }
 479
 480 struct sockaddr *
 481 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
 482 {
 483         struct sockaddr_in6 *sin6;
 484
 485         sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
 486         bzero(sin6, sizeof *sin6);
 487         sin6->sin6_family = AF_INET6;
 488         sin6->sin6_len = sizeof(*sin6);
 489         sin6->sin6_port = port;
 490         sin6->sin6_addr = *addr_p;
 491         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
 492
 493         return (struct sockaddr *)sin6;
 494 }
 495
 496 struct sockaddr *
 497 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
 498 {
 499         struct sockaddr_in sin;
 500         struct sockaddr_in6 *sin6_p;
 501
 502         bzero(&sin, sizeof sin);
 503         sin.sin_family = AF_INET;
 504         sin.sin_len = sizeof(sin);
 505         sin.sin_port = port;
 506         sin.sin_addr = *addr_p;
 507
 508         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
 509                 M_WAITOK);
 510         in6_sin_2_v4mapsin6(&sin, sin6_p);
 511
 512         return (struct sockaddr *)sin6_p;
 513 }
 514
 515 int
 516 in6_getsockaddr(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_getsockaddr: inp == NULL"));
 524
 525         INP_RLOCK(inp);
 526         port = inp->inp_lport;
 527         addr = inp->in6p_laddr;
 528         INP_RUNLOCK(inp);
 529
 530         *nam = in6_sockaddr(port, &addr);
 531         return 0;
 532 }
 533
 534 int
 535 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 536 {
 537         struct inpcb *inp;
 538         struct in6_addr addr;
 539         in_port_t port;
 540
 541         inp = sotoinpcb(so);
 542         KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
 543
 544         INP_RLOCK(inp);
 545         port = inp->inp_fport;
 546         addr = inp->in6p_faddr;
 547         INP_RUNLOCK(inp);
 548
 549         *nam = in6_sockaddr(port, &addr);
 550         return 0;
 551 }
 552
 553 int
 554 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 555 {
 556         struct  inpcb *inp;
 557         int     error;
 558
 559         inp = sotoinpcb(so);
 560         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
 561
 562 #ifdef INET
 563         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 564                 error = in_getsockaddr(so, nam);
 565                 if (error == 0)
 566                         in6_sin_2_v4mapsin6_in_sock(nam);
 567         } else
 568 #endif
 569         {
 570                 /* scope issues will be handled in in6_getsockaddr(). */
 571                 error = in6_getsockaddr(so, nam);
 572         }
 573
 574         return error;
 575 }
 576
 577 int
 578 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 579 {
 580         struct  inpcb *inp;
 581         int     error;
 582
 583         inp = sotoinpcb(so);
 584         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
 585
 586 #ifdef INET
 587         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 588                 error = in_getpeeraddr(so, nam);
 589                 if (error == 0)
 590                         in6_sin_2_v4mapsin6_in_sock(nam);
 591         } else
 592 #endif
 593         /* scope issues will be handled in in6_getpeeraddr(). */
 594         error = in6_getpeeraddr(so, nam);
 595
 596         return error;
 597 }
 598
 599 /*
 600  * Pass some notification to all connections of a protocol
 601  * associated with address dst.  The local address and/or port numbers
 602  * may be specified to limit the search.  The "usual action" will be
 603  * taken, depending on the ctlinput cmd.  The caller must filter any
 604  * cmds that are uninteresting (e.g., no error in the map).
 605  * Call the protocol specific routine (if any) to report
 606  * any errors for each matching socket.
 607  */
 608 void
 609 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
 610     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
 611     int cmd, void *cmdarg,
 612     struct inpcb *(*notify)(struct inpcb *, int))
 613 {
 614         struct inpcb *inp, *inp_temp;
 615         struct sockaddr_in6 sa6_src, *sa6_dst;
 616         u_short fport = fport_arg, lport = lport_arg;
 617         u_int32_t flowinfo;
 618         int errno;
 619
 620         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 621                 return;
 622
 623         sa6_dst = (struct sockaddr_in6 *)dst;
 624         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 625                 return;
 626
 627         /*
 628          * note that src can be NULL when we get notify by local fragmentation.
 629          */
 630         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 631         flowinfo = sa6_src.sin6_flowinfo;
 632
 633         /*
 634          * Redirects go to all references to the destination,
 635          * and use in6_rtchange to invalidate the route cache.
 636          * Dead host indications: also use in6_rtchange to invalidate
 637          * the cache, and deliver the error to all the sockets.
 638          * Otherwise, if we have knowledge of the local port and address,
 639          * deliver only to that socket.
 640          */
 641         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 642                 fport = 0;
 643                 lport = 0;
 644                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 645
 646                 if (cmd != PRC_HOSTDEAD)
 647                         notify = in6_rtchange;
 648         }
 649         errno = inet6ctlerrmap[cmd];
 650         INP_INFO_WLOCK(pcbinfo);
 651         CK_LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
 652                 INP_WLOCK(inp);
 653                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 654                         INP_WUNLOCK(inp);
 655                         continue;
 656                 }
 657
 658                 /*
 659                  * If the error designates a new path MTU for a destination
 660                  * and the application (associated with this socket) wanted to
 661                  * know the value, notify.
 662                  * XXX: should we avoid to notify the value to TCP sockets?
 663                  */
 664                 if (cmd == PRC_MSGSIZE && cmdarg != NULL)
 665                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
 666                                         *(u_int32_t *)cmdarg);
 667
 668                 /*
 669                  * Detect if we should notify the error. If no source and
 670                  * destination ports are specifed, but non-zero flowinfo and
 671                  * local address match, notify the error. This is the case
 672                  * when the error is delivered with an encrypted buffer
 673                  * by ESP. Otherwise, just compare addresses and ports
 674                  * as usual.
 675                  */
 676                 if (lport == 0 && fport == 0 && flowinfo &&
 677                     inp->inp_socket != NULL &&
 678                     flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
 679                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 680                         goto do_notify;
 681                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 682                                              &sa6_dst->sin6_addr) ||
 683                          inp->inp_socket == 0 ||
 684                          (lport && inp->inp_lport != lport) ||
 685                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 686                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 687                                               &sa6_src.sin6_addr)) ||
 688                          (fport && inp->inp_fport != fport)) {
 689                         INP_WUNLOCK(inp);
 690                         continue;
 691                 }
 692
 693           do_notify:
 694                 if (notify) {
 695                         if ((*notify)(inp, errno))
 696                                 INP_WUNLOCK(inp);
 697                 } else
 698                         INP_WUNLOCK(inp);
 699         }
 700         INP_INFO_WUNLOCK(pcbinfo);
 701 }
 702
 703 /*
 704  * Lookup a PCB based on the local address and port.  Caller must hold the
 705  * hash lock.  No inpcb locks or references are acquired.
 706  */
 707 struct inpcb *
 708 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
 709     u_short lport, int lookupflags, struct ucred *cred)
 710 {
 711         struct inpcb *inp;
 712         int matchwild = 3, wildcard;
 713
 714         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 715             ("%s: invalid lookup flags %d", __func__, lookupflags));
 716
 717         INP_HASH_WLOCK_ASSERT(pcbinfo);
 718
 719         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
 720                 struct inpcbhead *head;
 721                 /*
 722                  * Look for an unconnected (wildcard foreign addr) PCB that
 723                  * matches the local address and port we're looking for.
 724                  */
 725                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
 726                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
 727                     pcbinfo->ipi_hashmask)];
 728                 CK_LIST_FOREACH(inp, head, inp_hash) {
 729                         /* XXX inp locking */
 730                         if ((inp->inp_vflag & INP_IPV6) == 0)
 731                                 continue;
 732                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 733                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 734                             inp->inp_lport == lport) {
 735                                 /* Found. */
 736                                 if (cred == NULL ||
 737                                     prison_equal_ip6(cred->cr_prison,
 738                                         inp->inp_cred->cr_prison))
 739                                         return (inp);
 740                         }
 741                 }
 742                 /*
 743                  * Not found.
 744                  */
 745                 return (NULL);
 746         } else {
 747                 struct inpcbporthead *porthash;
 748                 struct inpcbport *phd;
 749                 struct inpcb *match = NULL;
 750                 /*
 751                  * Best fit PCB lookup.
 752                  *
 753                  * First see if this local port is in use by looking on the
 754                  * port hash list.
 755                  */
 756                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 757                     pcbinfo->ipi_porthashmask)];
 758                 CK_LIST_FOREACH(phd, porthash, phd_hash) {
 759                         if (phd->phd_port == lport)
 760                                 break;
 761                 }
 762                 if (phd != NULL) {
 763                         /*
 764                          * Port is in use by one or more PCBs. Look for best
 765                          * fit.
 766                          */
 767                         CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 768                                 wildcard = 0;
 769                                 if (cred != NULL &&
 770                                     !prison_equal_ip6(cred->cr_prison,
 771                                         inp->inp_cred->cr_prison))
 772                                         continue;
 773                                 /* XXX inp locking */
 774                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 775                                         continue;
 776                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 777                                         wildcard++;
 778                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 779                                         &inp->in6p_laddr)) {
 780                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 781                                                 wildcard++;
 782                                         else if (!IN6_ARE_ADDR_EQUAL(
 783                                             &inp->in6p_laddr, laddr))
 784                                                 continue;
 785                                 } else {
 786                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 787                                                 wildcard++;
 788                                 }
 789                                 if (wildcard < matchwild) {
 790                                         match = inp;
 791                                         matchwild = wildcard;
 792                                         if (matchwild == 0)
 793                                                 break;
 794                                 }
 795                         }
 796                 }
 797                 return (match);
 798         }
 799 }
 800
 801 void
 802 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 803 {
 804         struct inpcb *inp;
 805         struct in6_multi *inm;
 806         struct in6_mfilter *imf;
 807         struct ip6_moptions *im6o;
 808
 809         INP_INFO_WLOCK(pcbinfo);
 810         CK_LIST_FOREACH(inp, pcbinfo->ipi_listhead, inp_list) {
 811                 INP_WLOCK(inp);
 812                 if (__predict_false(inp->inp_flags2 & INP_FREED)) {
 813                         INP_WUNLOCK(inp);
 814                         continue;
 815                 }
 816                 im6o = inp->in6p_moptions;
 817                 if ((inp->inp_vflag & INP_IPV6) && im6o != NULL) {
 818                         /*
 819                          * Unselect the outgoing ifp for multicast if it
 820                          * is being detached.
 821                          */
 822                         if (im6o->im6o_multicast_ifp == ifp)
 823                                 im6o->im6o_multicast_ifp = NULL;
 824                         /*
 825                          * Drop multicast group membership if we joined
 826                          * through the interface being detached.
 827                          */
 828 restart:
 829                         IP6_MFILTER_FOREACH(imf, &im6o->im6o_head) {
 830                                 if ((inm = imf->im6f_in6m) == NULL)
 831                                         continue;
 832                                 if (inm->in6m_ifp != ifp)
 833                                         continue;
 834                                 ip6_mfilter_remove(&im6o->im6o_head, imf);
 835                                 IN6_MULTI_LOCK_ASSERT();
 836                                 in6_leavegroup_locked(inm, NULL);
 837                                 ip6_mfilter_free(imf);
 838                                 goto restart;
 839                         }
 840                 }
 841                 INP_WUNLOCK(inp);
 842         }
 843         INP_INFO_WUNLOCK(pcbinfo);
 844 }
 845
 846 /*
 847  * Check for alternatives when higher level complains
 848  * about service problems.  For now, invalidate cached
 849  * routing information.  If the route was created dynamically
 850  * (by a redirect), time to try a default gateway again.
 851  */
 852 void
 853 in6_losing(struct inpcb *inp)
 854 {
 855
 856         RO_INVALIDATE_CACHE(&inp->inp_route6);
 857 }
 858
 859 /*
 860  * After a routing change, flush old routing
 861  * and allocate a (hopefully) better one.
 862  */
 863 struct inpcb *
 864 in6_rtchange(struct inpcb *inp, int errno __unused)
 865 {
 866
 867         RO_INVALIDATE_CACHE(&inp->inp_route6);
 868         return inp;
 869 }
 870
 871 static struct inpcb *
 872 in6_pcblookup_lbgroup(const struct inpcbinfo *pcbinfo,
 873     const struct in6_addr *laddr, uint16_t lport, const struct in6_addr *faddr,
 874     uint16_t fport, int lookupflags)
 875 {
 876         struct inpcb *local_wild;
 877         const struct inpcblbgrouphead *hdr;
 878         struct inpcblbgroup *grp;
 879         uint32_t idx;
 880
 881         INP_HASH_LOCK_ASSERT(pcbinfo);
 882
 883         hdr = &pcbinfo->ipi_lbgrouphashbase[
 884             INP_PCBPORTHASH(lport, pcbinfo->ipi_lbgrouphashmask)];
 885
 886         /*
 887          * Order of socket selection:
 888          * 1. non-wild.
 889          * 2. wild (if lookupflags contains INPLOOKUP_WILDCARD).
 890          *
 891          * NOTE:
 892          * - Load balanced group does not contain jailed sockets.
 893          * - Load balanced does not contain IPv4 mapped INET6 wild sockets.
 894          */
 895         local_wild = NULL;
 896         CK_LIST_FOREACH(grp, hdr, il_list) {
 897 #ifdef INET
 898                 if (!(grp->il_vflag & INP_IPV6))
 899                         continue;
 900 #endif
 901                 if (grp->il_lport != lport)
 902                         continue;
 903
 904                 idx = INP_PCBLBGROUP_PKTHASH(INP6_PCBHASHKEY(faddr), lport,
 905                     fport) % grp->il_inpcnt;
 906                 if (IN6_ARE_ADDR_EQUAL(&grp->il6_laddr, laddr))
 907                         return (grp->il_inp[idx]);
 908                 if (IN6_IS_ADDR_UNSPECIFIED(&grp->il6_laddr) &&
 909                     (lookupflags & INPLOOKUP_WILDCARD) != 0)
 910                         local_wild = grp->il_inp[idx];
 911         }
 912         return (local_wild);
 913 }
 914
 915 #ifdef PCBGROUP
 916 /*
 917  * Lookup PCB in hash list, using pcbgroup tables.
 918  */
 919 static struct inpcb *
 920 in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
 921     struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
 922     u_int lport_arg, int lookupflags, struct ifnet *ifp)
 923 {
 924         struct inpcbhead *head;
 925         struct inpcb *inp, *tmpinp;
 926         u_short fport = fport_arg, lport = lport_arg;
 927         bool locked;
 928
 929         /*
 930          * First look for an exact match.
 931          */
 932         tmpinp = NULL;
 933         INP_GROUP_LOCK(pcbgroup);
 934         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(
 935             INP6_PCBHASHKEY(faddr), lport, fport, pcbgroup->ipg_hashmask)];
 936         CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 937                 /* XXX inp locking */
 938                 if ((inp->inp_vflag & INP_IPV6) == 0)
 939                         continue;
 940                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 941                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 942                     inp->inp_fport == fport &&
 943                     inp->inp_lport == lport) {
 944                         /*
 945                          * XXX We should be able to directly return
 946                          * the inp here, without any checks.
 947                          * Well unless both bound with SO_REUSEPORT?
 948                          */
 949                         if (prison_flag(inp->inp_cred, PR_IP6))
 950                                 goto found;
 951                         if (tmpinp == NULL)
 952                                 tmpinp = inp;
 953                 }
 954         }
 955         if (tmpinp != NULL) {
 956                 inp = tmpinp;
 957                 goto found;
 958         }
 959
 960         /*
 961          * Then look for a wildcard match in the pcbgroup.
 962          */
 963         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 964                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 965                 struct inpcb *jail_wild = NULL;
 966                 int injail;
 967
 968                 /*
 969                  * Order of socket selection - we always prefer jails.
 970                  *      1. jailed, non-wild.
 971                  *      2. jailed, wild.
 972                  *      3. non-jailed, non-wild.
 973                  *      4. non-jailed, wild.
 974                  */
 975                 head = &pcbgroup->ipg_hashbase[
 976                     INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
 977                 CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 978                         /* XXX inp locking */
 979                         if ((inp->inp_vflag & INP_IPV6) == 0)
 980                                 continue;
 981
 982                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 983                             inp->inp_lport != lport) {
 984                                 continue;
 985                         }
 986
 987                         injail = prison_flag(inp->inp_cred, PR_IP6);
 988                         if (injail) {
 989                                 if (prison_check_ip6(inp->inp_cred,
 990                                     laddr) != 0)
 991                                         continue;
 992                         } else {
 993                                 if (local_exact != NULL)
 994                                         continue;
 995                         }
 996
 997                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
 998                                 if (injail)
 999                                         goto found;
1000                                 else
1001                                         local_exact = inp;
1002                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1003                                 if (injail)
1004                                         jail_wild = inp;
1005                                 else
1006                                         local_wild = inp;
1007                         }
1008                 } /* LIST_FOREACH */
1009
1010                 inp = jail_wild;
1011                 if (inp == NULL)
1012                         inp = jail_wild;
1013                 if (inp == NULL)
1014                         inp = local_exact;
1015                 if (inp == NULL)
1016                         inp = local_wild;
1017                 if (inp != NULL)
1018                         goto found;
1019         }
1020
1021         /*
1022          * Then look for a wildcard match, if requested.
1023          */
1024         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1025                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1026                 struct inpcb *jail_wild = NULL;
1027                 int injail;
1028
1029                 /*
1030                  * Order of socket selection - we always prefer jails.
1031                  *      1. jailed, non-wild.
1032                  *      2. jailed, wild.
1033                  *      3. non-jailed, non-wild.
1034                  *      4. non-jailed, wild.
1035                  */
1036                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(
1037                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
1038                     pcbinfo->ipi_wildmask)];
1039                 CK_LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
1040                         /* XXX inp locking */
1041                         if ((inp->inp_vflag & INP_IPV6) == 0)
1042                                 continue;
1043
1044                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1045                             inp->inp_lport != lport) {
1046                                 continue;
1047                         }
1048
1049                         injail = prison_flag(inp->inp_cred, PR_IP6);
1050                         if (injail) {
1051                                 if (prison_check_ip6(inp->inp_cred,
1052                                     laddr) != 0)
1053                                         continue;
1054                         } else {
1055                                 if (local_exact != NULL)
1056                                         continue;
1057                         }
1058
1059                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1060                                 if (injail)
1061                                         goto found;
1062                                 else
1063                                         local_exact = inp;
1064                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1065                                 if (injail)
1066                                         jail_wild = inp;
1067                                 else
1068                                         local_wild = inp;
1069                         }
1070                 } /* LIST_FOREACH */
1071
1072                 inp = jail_wild;
1073                 if (inp == NULL)
1074                         inp = jail_wild;
1075                 if (inp == NULL)
1076                         inp = local_exact;
1077                 if (inp == NULL)
1078                         inp = local_wild;
1079                 if (inp != NULL)
1080                         goto found;
1081         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1082         INP_GROUP_UNLOCK(pcbgroup);
1083         return (NULL);
1084
1085 found:
1086         if (lookupflags & INPLOOKUP_WLOCKPCB)
1087                 locked = INP_TRY_WLOCK(inp);
1088         else if (lookupflags & INPLOOKUP_RLOCKPCB)
1089                 locked = INP_TRY_RLOCK(inp);
1090         else
1091                 panic("%s: locking buf", __func__);
1092         if (!locked)
1093                 in_pcbref(inp);
1094         INP_GROUP_UNLOCK(pcbgroup);
1095         if (!locked) {
1096                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1097                         INP_WLOCK(inp);
1098                         if (in_pcbrele_wlocked(inp))
1099                                 return (NULL);
1100                 } else {
1101                         INP_RLOCK(inp);
1102                         if (in_pcbrele_rlocked(inp))
1103                                 return (NULL);
1104                 }
1105         }
1106 #ifdef INVARIANTS
1107         if (lookupflags & INPLOOKUP_WLOCKPCB)
1108                 INP_WLOCK_ASSERT(inp);
1109         else
1110                 INP_RLOCK_ASSERT(inp);
1111 #endif
1112         return (inp);
1113 }
1114 #endif /* PCBGROUP */
1115
1116 /*
1117  * Lookup PCB in hash list.
1118  */
1119 static struct inpcb *
1120 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1121     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1122     int lookupflags, struct ifnet *ifp)
1123 {
1124         struct inpcbhead *head;
1125         struct inpcb *inp, *tmpinp;
1126         u_short fport = fport_arg, lport = lport_arg;
1127
1128         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1129             ("%s: invalid lookup flags %d", __func__, lookupflags));
1130
1131         INP_HASH_LOCK_ASSERT(pcbinfo);
1132
1133         /*
1134          * First look for an exact match.
1135          */
1136         tmpinp = NULL;
1137         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1138             INP6_PCBHASHKEY(faddr), lport, fport, pcbinfo->ipi_hashmask)];
1139         CK_LIST_FOREACH(inp, head, inp_hash) {
1140                 /* XXX inp locking */
1141                 if ((inp->inp_vflag & INP_IPV6) == 0)
1142                         continue;
1143                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1144                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1145                     inp->inp_fport == fport &&
1146                     inp->inp_lport == lport) {
1147                         /*
1148                          * XXX We should be able to directly return
1149                          * the inp here, without any checks.
1150                          * Well unless both bound with SO_REUSEPORT?
1151                          */
1152                         if (prison_flag(inp->inp_cred, PR_IP6))
1153                                 return (inp);
1154                         if (tmpinp == NULL)
1155                                 tmpinp = inp;
1156                 }
1157         }
1158         if (tmpinp != NULL)
1159                 return (tmpinp);
1160
1161         /*
1162          * Then look in lb group (for wildcard match).
1163          */
1164         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1165                 inp = in6_pcblookup_lbgroup(pcbinfo, laddr, lport, faddr,
1166                     fport, lookupflags);
1167                 if (inp != NULL)
1168                         return (inp);
1169         }
1170
1171         /*
1172          * Then look for a wildcard match, if requested.
1173          */
1174         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1175                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1176                 struct inpcb *jail_wild = NULL;
1177                 int injail;
1178
1179                 /*
1180                  * Order of socket selection - we always prefer jails.
1181                  *      1. jailed, non-wild.
1182                  *      2. jailed, wild.
1183                  *      3. non-jailed, non-wild.
1184                  *      4. non-jailed, wild.
1185                  */
1186                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1187                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
1188                     pcbinfo->ipi_hashmask)];
1189                 CK_LIST_FOREACH(inp, head, inp_hash) {
1190                         /* XXX inp locking */
1191                         if ((inp->inp_vflag & INP_IPV6) == 0)
1192                                 continue;
1193
1194                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1195                             inp->inp_lport != lport) {
1196                                 continue;
1197                         }
1198
1199                         injail = prison_flag(inp->inp_cred, PR_IP6);
1200                         if (injail) {
1201                                 if (prison_check_ip6(inp->inp_cred,
1202                                     laddr) != 0)
1203                                         continue;
1204                         } else {
1205                                 if (local_exact != NULL)
1206                                         continue;
1207                         }
1208
1209                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1210                                 if (injail)
1211                                         return (inp);
1212                                 else
1213                                         local_exact = inp;
1214                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1215                                 if (injail)
1216                                         jail_wild = inp;
1217                                 else
1218                                         local_wild = inp;
1219                         }
1220                 } /* LIST_FOREACH */
1221
1222                 if (jail_wild != NULL)
1223                         return (jail_wild);
1224                 if (local_exact != NULL)
1225                         return (local_exact);
1226                 if (local_wild != NULL)
1227                         return (local_wild);
1228         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1229
1230         /*
1231          * Not found.
1232          */
1233         return (NULL);
1234 }
1235
1236 /*
1237  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1238  * hash list lock, and will return the inpcb locked (i.e., requires
1239  * INPLOOKUP_LOCKPCB).
1240  */
1241 static struct inpcb *
1242 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1243     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1244     struct ifnet *ifp)
1245 {
1246         struct inpcb *inp;
1247
1248         INP_HASH_RLOCK(pcbinfo);
1249         inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1250             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1251         if (inp != NULL) {
1252                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1253                         INP_WLOCK(inp);
1254                         if (__predict_false(inp->inp_flags2 & INP_FREED)) {
1255                                 INP_WUNLOCK(inp);
1256                                 inp = NULL;
1257                         }
1258                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
1259                         INP_RLOCK(inp);
1260                         if (__predict_false(inp->inp_flags2 & INP_FREED)) {
1261                                 INP_RUNLOCK(inp);
1262                                 inp = NULL;
1263                         }
1264                 } else
1265                         panic("%s: locking bug", __func__);
1266 #ifdef INVARIANTS
1267                 if (inp != NULL) {
1268                         if (lookupflags & INPLOOKUP_WLOCKPCB)
1269                                 INP_WLOCK_ASSERT(inp);
1270                         else
1271                                 INP_RLOCK_ASSERT(inp);
1272                 }
1273 #endif
1274         }
1275         INP_HASH_RUNLOCK(pcbinfo);
1276         return (inp);
1277 }
1278
1279 /*
1280  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1281  * from which a pre-calculated hash value may be extracted.
1282  *
1283  * Possibly more of this logic should be in in6_pcbgroup.c.
1284  */
1285 struct inpcb *
1286 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
1287     struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1288 {
1289 #if defined(PCBGROUP) && !defined(RSS)
1290         struct inpcbgroup *pcbgroup;
1291 #endif
1292
1293         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1294             ("%s: invalid lookup flags %d", __func__, lookupflags));
1295         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1296             ("%s: LOCKPCB not set", __func__));
1297
1298         /*
1299          * When not using RSS, use connection groups in preference to the
1300          * reservation table when looking up 4-tuples.  When using RSS, just
1301          * use the reservation table, due to the cost of the Toeplitz hash
1302          * in software.
1303          *
1304          * XXXRW: This policy belongs in the pcbgroup code, as in principle
1305          * we could be doing RSS with a non-Toeplitz hash that is affordable
1306          * in software.
1307          */
1308 #if defined(PCBGROUP) && !defined(RSS)
1309         if (in_pcbgroup_enabled(pcbinfo)) {
1310                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1311                     fport);
1312                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1313                     laddr, lport, lookupflags, ifp));
1314         }
1315 #endif
1316         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1317             lookupflags, ifp));
1318 }
1319
1320 struct inpcb *
1321 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1322     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1323     struct ifnet *ifp, struct mbuf *m)
1324 {
1325 #ifdef PCBGROUP
1326         struct inpcbgroup *pcbgroup;
1327 #endif
1328
1329         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1330             ("%s: invalid lookup flags %d", __func__, lookupflags));
1331         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1332             ("%s: LOCKPCB not set", __func__));
1333
1334 #ifdef PCBGROUP
1335         /*
1336          * If we can use a hardware-generated hash to look up the connection
1337          * group, use that connection group to find the inpcb.  Otherwise
1338          * fall back on a software hash -- or the reservation table if we're
1339          * using RSS.
1340          *
1341          * XXXRW: As above, that policy belongs in the pcbgroup code.
1342          */
1343         if (in_pcbgroup_enabled(pcbinfo) &&
1344             M_HASHTYPE_TEST(m, M_HASHTYPE_NONE) == 0) {
1345                 pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1346                     m->m_pkthdr.flowid);
1347                 if (pcbgroup != NULL)
1348                         return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
1349                             fport, laddr, lport, lookupflags, ifp));
1350 #ifndef RSS
1351                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1352                     fport);
1353                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1354                     laddr, lport, lookupflags, ifp));
1355 #endif
1356         }
1357 #endif
1358         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1359             lookupflags, ifp));
1360 }
1361
1362 void
1363 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst)
1364 {
1365         struct ip6_hdr *ip;
1366
1367         ip = mtod(m, struct ip6_hdr *);
1368         bzero(sin6, sizeof(*sin6));
1369         sin6->sin6_len = sizeof(*sin6);
1370         sin6->sin6_family = AF_INET6;
1371         sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src;
1372
1373         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
1374
1375         return;
1376 }