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         INP_WLOCK_ASSERT(inp);
 129         INP_HASH_WLOCK_ASSERT(pcbinfo);
 130
 131         if (CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) /* XXX broken! */
 132                 return (EADDRNOTAVAIL);
 133         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 134                 return (EINVAL);
 135         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
 136                 lookupflags = INPLOOKUP_WILDCARD;
 137         if (nam == NULL) {
 138                 if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
 139                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
 140                         return (error);
 141         } else {
 142                 sin6 = (struct sockaddr_in6 *)nam;
 143                 if (nam->sa_len != sizeof(*sin6))
 144                         return (EINVAL);
 145                 /*
 146                  * family check.
 147                  */
 148                 if (nam->sa_family != AF_INET6)
 149                         return (EAFNOSUPPORT);
 150
 151                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 152                         return(error);
 153
 154                 if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
 155                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
 156                         return (error);
 157
 158                 lport = sin6->sin6_port;
 159                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
 160                         /*
 161                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
 162                          * allow compepte duplication of binding if
 163                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
 164                          * and a multicast address is bound on both
 165                          * new and duplicated sockets.
 166                          */
 167                         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) != 0)
 168                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
 169                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 170                         struct ifaddr *ifa;
 171
 172                         sin6->sin6_port = 0;            /* yech... */
 173                         NET_EPOCH_ENTER();
 174                         if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
 175                             NULL &&
 176                             (inp->inp_flags & INP_BINDANY) == 0) {
 177                                 NET_EPOCH_EXIT();
 178                                 return (EADDRNOTAVAIL);
 179                         }
 180
 181                         /*
 182                          * XXX: bind to an anycast address might accidentally
 183                          * cause sending a packet with anycast source address.
 184                          * We should allow to bind to a deprecated address, since
 185                          * the application dares to use it.
 186                          */
 187                         if (ifa != NULL &&
 188                             ((struct in6_ifaddr *)ifa)->ia6_flags &
 189                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
 190                                 NET_EPOCH_EXIT();
 191                                 return (EADDRNOTAVAIL);
 192                         }
 193                         NET_EPOCH_EXIT();
 194                 }
 195                 if (lport) {
 196                         struct inpcb *t;
 197                         struct tcptw *tw;
 198
 199                         /* GROSS */
 200                         if (ntohs(lport) <= V_ipport_reservedhigh &&
 201                             ntohs(lport) >= V_ipport_reservedlow &&
 202                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
 203                             0))
 204                                 return (EACCES);
 205                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
 206                             priv_check_cred(inp->inp_cred,
 207                             PRIV_NETINET_REUSEPORT, 0) != 0) {
 208                                 t = in6_pcblookup_local(pcbinfo,
 209                                     &sin6->sin6_addr, lport,
 210                                     INPLOOKUP_WILDCARD, cred);
 211                                 if (t &&
 212                                     ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 213                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
 214                                     (so->so_type != SOCK_STREAM ||
 215                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
 216                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
 217                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
 218                                      (t->inp_flags2 & INP_REUSEPORT) == 0) &&
 219                                     (inp->inp_cred->cr_uid !=
 220                                      t->inp_cred->cr_uid))
 221                                         return (EADDRINUSE);
 222
 223                                 /*
 224                                  * If the socket is a BINDMULTI socket, then
 225                                  * the credentials need to match and the
 226                                  * original socket also has to have been bound
 227                                  * with BINDMULTI.
 228                                  */
 229                                 if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 230                                         return (EADDRINUSE);
 231
 232 #ifdef INET
 233                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 234                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 235                                         struct sockaddr_in sin;
 236
 237                                         in6_sin6_2_sin(&sin, sin6);
 238                                         t = in_pcblookup_local(pcbinfo,
 239                                             sin.sin_addr, lport,
 240                                             INPLOOKUP_WILDCARD, cred);
 241                                         if (t &&
 242                                             ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
 243                                             ((t->inp_flags &
 244                                               INP_TIMEWAIT) == 0) &&
 245                                             (so->so_type != SOCK_STREAM ||
 246                                              ntohl(t->inp_faddr.s_addr) ==
 247                                               INADDR_ANY) &&
 248                                             (inp->inp_cred->cr_uid !=
 249                                              t->inp_cred->cr_uid))
 250                                                 return (EADDRINUSE);
 251
 252                                         if (t && (! in_pcbbind_check_bindmulti(inp, t)))
 253                                                 return (EADDRINUSE);
 254                                 }
 255 #endif
 256                         }
 257                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
 258                             lport, lookupflags, cred);
 259                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
 260                                 /*
 261                                  * XXXRW: If an incpb has had its timewait
 262                                  * state recycled, we treat the address as
 263                                  * being in use (for now).  This is better
 264                                  * than a panic, but not desirable.
 265                                  */
 266                                 tw = intotw(t);
 267                                 if (tw == NULL ||
 268                                     (reuseport & tw->tw_so_options) == 0)
 269                                         return (EADDRINUSE);
 270                         } else if (t && (reuseport & inp_so_options(t)) == 0) {
 271                                 return (EADDRINUSE);
 272                         }
 273 #ifdef INET
 274                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
 275                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
 276                                 struct sockaddr_in sin;
 277
 278                                 in6_sin6_2_sin(&sin, sin6);
 279                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
 280                                     lport, lookupflags, cred);
 281                                 if (t && t->inp_flags & INP_TIMEWAIT) {
 282                                         tw = intotw(t);
 283                                         if (tw == NULL)
 284                                                 return (EADDRINUSE);
 285                                         if ((reuseport & tw->tw_so_options) == 0
 286                                             && (ntohl(t->inp_laddr.s_addr) !=
 287                                              INADDR_ANY || ((inp->inp_vflag &
 288                                              INP_IPV6PROTO) ==
 289                                              (t->inp_vflag & INP_IPV6PROTO))))
 290                                                 return (EADDRINUSE);
 291                                 } else if (t &&
 292                                     (reuseport & inp_so_options(t)) == 0 &&
 293                                     (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
 294                                     (t->inp_vflag & INP_IPV6PROTO) != 0))
 295                                         return (EADDRINUSE);
 296                         }
 297 #endif
 298                 }
 299                 inp->in6p_laddr = sin6->sin6_addr;
 300         }
 301         if (lport == 0) {
 302                 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
 303                         /* Undo an address bind that may have occurred. */
 304                         inp->in6p_laddr = in6addr_any;
 305                         return (error);
 306                 }
 307         } else {
 308                 inp->inp_lport = lport;
 309                 if (in_pcbinshash(inp) != 0) {
 310                         inp->in6p_laddr = in6addr_any;
 311                         inp->inp_lport = 0;
 312                         return (EAGAIN);
 313                 }
 314         }
 315         return (0);
 316 }
 317
 318 /*
 319  *   Transform old in6_pcbconnect() into an inner subroutine for new
 320  *   in6_pcbconnect(): Do some validity-checking on the remote
 321  *   address (in mbuf 'nam') and then determine local host address
 322  *   (i.e., which interface) to use to access that remote host.
 323  *
 324  *   This preserves definition of in6_pcbconnect(), while supporting a
 325  *   slightly different version for T/TCP.  (This is more than
 326  *   a bit of a kludge, but cleaning up the internal interfaces would
 327  *   have forced minor changes in every protocol).
 328  */
 329 static int
 330 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
 331     struct in6_addr *plocal_addr6)
 332 {
 333         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 334         int error = 0;
 335         int scope_ambiguous = 0;
 336         struct in6_addr in6a;
 337
 338         INP_WLOCK_ASSERT(inp);
 339         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);        /* XXXRW: why? */
 340
 341         if (nam->sa_len != sizeof (*sin6))
 342                 return (EINVAL);
 343         if (sin6->sin6_family != AF_INET6)
 344                 return (EAFNOSUPPORT);
 345         if (sin6->sin6_port == 0)
 346                 return (EADDRNOTAVAIL);
 347
 348         if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
 349                 scope_ambiguous = 1;
 350         if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
 351                 return(error);
 352
 353         if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) {
 354                 /*
 355                  * If the destination address is UNSPECIFIED addr,
 356                  * use the loopback addr, e.g ::1.
 357                  */
 358                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
 359                         sin6->sin6_addr = in6addr_loopback;
 360         }
 361         if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
 362                 return (error);
 363
 364         error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
 365             inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
 366         if (error)
 367                 return (error);
 368
 369         /*
 370          * Do not update this earlier, in case we return with an error.
 371          *
 372          * XXX: this in6_selectsrc_socket result might replace the bound local
 373          * address with the address specified by setsockopt(IPV6_PKTINFO).
 374          * Is it the intended behavior?
 375          */
 376         *plocal_addr6 = in6a;
 377
 378         /*
 379          * Don't do pcblookup call here; return interface in
 380          * plocal_addr6
 381          * and exit to caller, that will do the lookup.
 382          */
 383
 384         return (0);
 385 }
 386
 387 /*
 388  * Outer subroutine:
 389  * Connect from a socket to a specified address.
 390  * Both address and port must be specified in argument sin.
 391  * If don't have a local address for this socket yet,
 392  * then pick one.
 393  */
 394 int
 395 in6_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
 396     struct ucred *cred, struct mbuf *m)
 397 {
 398         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
 399         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
 400         struct in6_addr addr6;
 401         int error;
 402
 403         INP_WLOCK_ASSERT(inp);
 404         INP_HASH_WLOCK_ASSERT(pcbinfo);
 405
 406         /*
 407          * Call inner routine, to assign local interface address.
 408          * in6_pcbladdr() may automatically fill in sin6_scope_id.
 409          */
 410         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
 411                 return (error);
 412
 413         if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
 414                                sin6->sin6_port,
 415                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
 416                               ? &addr6 : &inp->in6p_laddr,
 417                               inp->inp_lport, 0, NULL) != NULL) {
 418                 return (EADDRINUSE);
 419         }
 420         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 421                 if (inp->inp_lport == 0) {
 422                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
 423                         if (error)
 424                                 return (error);
 425                 }
 426                 inp->in6p_laddr = addr6;
 427         }
 428         inp->in6p_faddr = sin6->sin6_addr;
 429         inp->inp_fport = sin6->sin6_port;
 430         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 431         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 432         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
 433                 inp->inp_flow |=
 434                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
 435
 436         in_pcbrehash_mbuf(inp, m);
 437
 438         return (0);
 439 }
 440
 441 int
 442 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
 443 {
 444
 445         return (in6_pcbconnect_mbuf(inp, nam, cred, NULL));
 446 }
 447
 448 void
 449 in6_pcbdisconnect(struct inpcb *inp)
 450 {
 451
 452         INP_WLOCK_ASSERT(inp);
 453         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
 454
 455         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
 456         inp->inp_fport = 0;
 457         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
 458         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
 459         in_pcbrehash(inp);
 460 }
 461
 462 struct sockaddr *
 463 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
 464 {
 465         struct sockaddr_in6 *sin6;
 466
 467         sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
 468         bzero(sin6, sizeof *sin6);
 469         sin6->sin6_family = AF_INET6;
 470         sin6->sin6_len = sizeof(*sin6);
 471         sin6->sin6_port = port;
 472         sin6->sin6_addr = *addr_p;
 473         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
 474
 475         return (struct sockaddr *)sin6;
 476 }
 477
 478 struct sockaddr *
 479 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
 480 {
 481         struct sockaddr_in sin;
 482         struct sockaddr_in6 *sin6_p;
 483
 484         bzero(&sin, sizeof sin);
 485         sin.sin_family = AF_INET;
 486         sin.sin_len = sizeof(sin);
 487         sin.sin_port = port;
 488         sin.sin_addr = *addr_p;
 489
 490         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
 491                 M_WAITOK);
 492         in6_sin_2_v4mapsin6(&sin, sin6_p);
 493
 494         return (struct sockaddr *)sin6_p;
 495 }
 496
 497 int
 498 in6_getsockaddr(struct socket *so, struct sockaddr **nam)
 499 {
 500         struct inpcb *inp;
 501         struct in6_addr addr;
 502         in_port_t port;
 503
 504         inp = sotoinpcb(so);
 505         KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
 506
 507         INP_RLOCK(inp);
 508         port = inp->inp_lport;
 509         addr = inp->in6p_laddr;
 510         INP_RUNLOCK(inp);
 511
 512         *nam = in6_sockaddr(port, &addr);
 513         return 0;
 514 }
 515
 516 int
 517 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
 518 {
 519         struct inpcb *inp;
 520         struct in6_addr addr;
 521         in_port_t port;
 522
 523         inp = sotoinpcb(so);
 524         KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
 525
 526         INP_RLOCK(inp);
 527         port = inp->inp_fport;
 528         addr = inp->in6p_faddr;
 529         INP_RUNLOCK(inp);
 530
 531         *nam = in6_sockaddr(port, &addr);
 532         return 0;
 533 }
 534
 535 int
 536 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
 537 {
 538         struct  inpcb *inp;
 539         int     error;
 540
 541         inp = sotoinpcb(so);
 542         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
 543
 544 #ifdef INET
 545         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 546                 error = in_getsockaddr(so, nam);
 547                 if (error == 0)
 548                         in6_sin_2_v4mapsin6_in_sock(nam);
 549         } else
 550 #endif
 551         {
 552                 /* scope issues will be handled in in6_getsockaddr(). */
 553                 error = in6_getsockaddr(so, nam);
 554         }
 555
 556         return error;
 557 }
 558
 559 int
 560 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
 561 {
 562         struct  inpcb *inp;
 563         int     error;
 564
 565         inp = sotoinpcb(so);
 566         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
 567
 568 #ifdef INET
 569         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
 570                 error = in_getpeeraddr(so, nam);
 571                 if (error == 0)
 572                         in6_sin_2_v4mapsin6_in_sock(nam);
 573         } else
 574 #endif
 575         /* scope issues will be handled in in6_getpeeraddr(). */
 576         error = in6_getpeeraddr(so, nam);
 577
 578         return error;
 579 }
 580
 581 /*
 582  * Pass some notification to all connections of a protocol
 583  * associated with address dst.  The local address and/or port numbers
 584  * may be specified to limit the search.  The "usual action" will be
 585  * taken, depending on the ctlinput cmd.  The caller must filter any
 586  * cmds that are uninteresting (e.g., no error in the map).
 587  * Call the protocol specific routine (if any) to report
 588  * any errors for each matching socket.
 589  */
 590 void
 591 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
 592     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
 593     int cmd, void *cmdarg,
 594     struct inpcb *(*notify)(struct inpcb *, int))
 595 {
 596         struct inpcb *inp, *inp_temp;
 597         struct sockaddr_in6 sa6_src, *sa6_dst;
 598         u_short fport = fport_arg, lport = lport_arg;
 599         u_int32_t flowinfo;
 600         int errno;
 601
 602         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
 603                 return;
 604
 605         sa6_dst = (struct sockaddr_in6 *)dst;
 606         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
 607                 return;
 608
 609         /*
 610          * note that src can be NULL when we get notify by local fragmentation.
 611          */
 612         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
 613         flowinfo = sa6_src.sin6_flowinfo;
 614
 615         /*
 616          * Redirects go to all references to the destination,
 617          * and use in6_rtchange to invalidate the route cache.
 618          * Dead host indications: also use in6_rtchange to invalidate
 619          * the cache, and deliver the error to all the sockets.
 620          * Otherwise, if we have knowledge of the local port and address,
 621          * deliver only to that socket.
 622          */
 623         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
 624                 fport = 0;
 625                 lport = 0;
 626                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
 627
 628                 if (cmd != PRC_HOSTDEAD)
 629                         notify = in6_rtchange;
 630         }
 631         errno = inet6ctlerrmap[cmd];
 632         INP_INFO_WLOCK(pcbinfo);
 633         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
 634                 INP_WLOCK(inp);
 635                 if ((inp->inp_vflag & INP_IPV6) == 0) {
 636                         INP_WUNLOCK(inp);
 637                         continue;
 638                 }
 639
 640                 /*
 641                  * If the error designates a new path MTU for a destination
 642                  * and the application (associated with this socket) wanted to
 643                  * know the value, notify.
 644                  * XXX: should we avoid to notify the value to TCP sockets?
 645                  */
 646                 if (cmd == PRC_MSGSIZE && cmdarg != NULL)
 647                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
 648                                         *(u_int32_t *)cmdarg);
 649
 650                 /*
 651                  * Detect if we should notify the error. If no source and
 652                  * destination ports are specifed, but non-zero flowinfo and
 653                  * local address match, notify the error. This is the case
 654                  * when the error is delivered with an encrypted buffer
 655                  * by ESP. Otherwise, just compare addresses and ports
 656                  * as usual.
 657                  */
 658                 if (lport == 0 && fport == 0 && flowinfo &&
 659                     inp->inp_socket != NULL &&
 660                     flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
 661                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
 662                         goto do_notify;
 663                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
 664                                              &sa6_dst->sin6_addr) ||
 665                          inp->inp_socket == 0 ||
 666                          (lport && inp->inp_lport != lport) ||
 667                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
 668                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
 669                                               &sa6_src.sin6_addr)) ||
 670                          (fport && inp->inp_fport != fport)) {
 671                         INP_WUNLOCK(inp);
 672                         continue;
 673                 }
 674
 675           do_notify:
 676                 if (notify) {
 677                         if ((*notify)(inp, errno))
 678                                 INP_WUNLOCK(inp);
 679                 } else
 680                         INP_WUNLOCK(inp);
 681         }
 682         INP_INFO_WUNLOCK(pcbinfo);
 683 }
 684
 685 /*
 686  * Lookup a PCB based on the local address and port.  Caller must hold the
 687  * hash lock.  No inpcb locks or references are acquired.
 688  */
 689 struct inpcb *
 690 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
 691     u_short lport, int lookupflags, struct ucred *cred)
 692 {
 693         struct inpcb *inp;
 694         int matchwild = 3, wildcard;
 695
 696         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 697             ("%s: invalid lookup flags %d", __func__, lookupflags));
 698
 699         INP_HASH_WLOCK_ASSERT(pcbinfo);
 700
 701         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
 702                 struct inpcbhead *head;
 703                 /*
 704                  * Look for an unconnected (wildcard foreign addr) PCB that
 705                  * matches the local address and port we're looking for.
 706                  */
 707                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
 708                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
 709                     pcbinfo->ipi_hashmask)];
 710                 LIST_FOREACH(inp, head, inp_hash) {
 711                         /* XXX inp locking */
 712                         if ((inp->inp_vflag & INP_IPV6) == 0)
 713                                 continue;
 714                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
 715                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 716                             inp->inp_lport == lport) {
 717                                 /* Found. */
 718                                 if (cred == NULL ||
 719                                     prison_equal_ip6(cred->cr_prison,
 720                                         inp->inp_cred->cr_prison))
 721                                         return (inp);
 722                         }
 723                 }
 724                 /*
 725                  * Not found.
 726                  */
 727                 return (NULL);
 728         } else {
 729                 struct inpcbporthead *porthash;
 730                 struct inpcbport *phd;
 731                 struct inpcb *match = NULL;
 732                 /*
 733                  * Best fit PCB lookup.
 734                  *
 735                  * First see if this local port is in use by looking on the
 736                  * port hash list.
 737                  */
 738                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
 739                     pcbinfo->ipi_porthashmask)];
 740                 LIST_FOREACH(phd, porthash, phd_hash) {
 741                         if (phd->phd_port == lport)
 742                                 break;
 743                 }
 744                 if (phd != NULL) {
 745                         /*
 746                          * Port is in use by one or more PCBs. Look for best
 747                          * fit.
 748                          */
 749                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
 750                                 wildcard = 0;
 751                                 if (cred != NULL &&
 752                                     !prison_equal_ip6(cred->cr_prison,
 753                                         inp->inp_cred->cr_prison))
 754                                         continue;
 755                                 /* XXX inp locking */
 756                                 if ((inp->inp_vflag & INP_IPV6) == 0)
 757                                         continue;
 758                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
 759                                         wildcard++;
 760                                 if (!IN6_IS_ADDR_UNSPECIFIED(
 761                                         &inp->in6p_laddr)) {
 762                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
 763                                                 wildcard++;
 764                                         else if (!IN6_ARE_ADDR_EQUAL(
 765                                             &inp->in6p_laddr, laddr))
 766                                                 continue;
 767                                 } else {
 768                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
 769                                                 wildcard++;
 770                                 }
 771                                 if (wildcard < matchwild) {
 772                                         match = inp;
 773                                         matchwild = wildcard;
 774                                         if (matchwild == 0)
 775                                                 break;
 776                                 }
 777                         }
 778                 }
 779                 return (match);
 780         }
 781 }
 782
 783 void
 784 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
 785 {
 786         struct inpcb *in6p;
 787         struct ip6_moptions *im6o;
 788         int i, gap;
 789
 790         INP_INFO_WLOCK(pcbinfo);
 791         LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
 792                 INP_WLOCK(in6p);
 793                 im6o = in6p->in6p_moptions;
 794                 if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) {
 795                         /*
 796                          * Unselect the outgoing ifp for multicast if it
 797                          * is being detached.
 798                          */
 799                         if (im6o->im6o_multicast_ifp == ifp)
 800                                 im6o->im6o_multicast_ifp = NULL;
 801                         /*
 802                          * Drop multicast group membership if we joined
 803                          * through the interface being detached.
 804                          */
 805                         gap = 0;
 806                         for (i = 0; i < im6o->im6o_num_memberships; i++) {
 807                                 if (im6o->im6o_membership[i]->in6m_ifp ==
 808                                     ifp) {
 809                                         in6_leavegroup(im6o->im6o_membership[i], NULL);
 810                                         gap++;
 811                                 } else if (gap != 0) {
 812                                         im6o->im6o_membership[i - gap] =
 813                                             im6o->im6o_membership[i];
 814                                 }
 815                         }
 816                         im6o->im6o_num_memberships -= gap;
 817                 }
 818                 INP_WUNLOCK(in6p);
 819         }
 820         INP_INFO_WUNLOCK(pcbinfo);
 821 }
 822
 823 /*
 824  * Check for alternatives when higher level complains
 825  * about service problems.  For now, invalidate cached
 826  * routing information.  If the route was created dynamically
 827  * (by a redirect), time to try a default gateway again.
 828  */
 829 void
 830 in6_losing(struct inpcb *in6p)
 831 {
 832
 833         if (in6p->inp_route6.ro_rt) {
 834                 RTFREE(in6p->inp_route6.ro_rt);
 835                 in6p->inp_route6.ro_rt = (struct rtentry *)NULL;
 836         }
 837         if (in6p->inp_route.ro_lle)
 838                 LLE_FREE(in6p->inp_route.ro_lle);       /* zeros ro_lle */
 839         return;
 840 }
 841
 842 /*
 843  * After a routing change, flush old routing
 844  * and allocate a (hopefully) better one.
 845  */
 846 struct inpcb *
 847 in6_rtchange(struct inpcb *inp, int errno)
 848 {
 849
 850         if (inp->inp_route6.ro_rt) {
 851                 RTFREE(inp->inp_route6.ro_rt);
 852                 inp->inp_route6.ro_rt = (struct rtentry *)NULL;
 853         }
 854         if (inp->inp_route.ro_lle)
 855                 LLE_FREE(inp->inp_route.ro_lle);        /* zeros ro_lle */
 856         return inp;
 857 }
 858
 859 #ifdef PCBGROUP
 860 /*
 861  * Lookup PCB in hash list, using pcbgroup tables.
 862  */
 863 static struct inpcb *
 864 in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
 865     struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
 866     u_int lport_arg, int lookupflags, struct ifnet *ifp)
 867 {
 868         struct inpcbhead *head;
 869         struct inpcb *inp, *tmpinp;
 870         u_short fport = fport_arg, lport = lport_arg;
 871         bool locked;
 872
 873         /*
 874          * First look for an exact match.
 875          */
 876         tmpinp = NULL;
 877         INP_GROUP_LOCK(pcbgroup);
 878         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(
 879             INP6_PCBHASHKEY(faddr), lport, fport, pcbgroup->ipg_hashmask)];
 880         LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 881                 /* XXX inp locking */
 882                 if ((inp->inp_vflag & INP_IPV6) == 0)
 883                         continue;
 884                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 885                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 886                     inp->inp_fport == fport &&
 887                     inp->inp_lport == lport) {
 888                         /*
 889                          * XXX We should be able to directly return
 890                          * the inp here, without any checks.
 891                          * Well unless both bound with SO_REUSEPORT?
 892                          */
 893                         if (prison_flag(inp->inp_cred, PR_IP6))
 894                                 goto found;
 895                         if (tmpinp == NULL)
 896                                 tmpinp = inp;
 897                 }
 898         }
 899         if (tmpinp != NULL) {
 900                 inp = tmpinp;
 901                 goto found;
 902         }
 903
 904         /*
 905          * Then look for a wildcard match in the pcbgroup.
 906          */
 907         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 908                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 909                 struct inpcb *jail_wild = NULL;
 910                 int injail;
 911
 912                 /*
 913                  * Order of socket selection - we always prefer jails.
 914                  *      1. jailed, non-wild.
 915                  *      2. jailed, wild.
 916                  *      3. non-jailed, non-wild.
 917                  *      4. non-jailed, wild.
 918                  */
 919                 head = &pcbgroup->ipg_hashbase[
 920                     INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
 921                 LIST_FOREACH(inp, head, inp_pcbgrouphash) {
 922                         /* XXX inp locking */
 923                         if ((inp->inp_vflag & INP_IPV6) == 0)
 924                                 continue;
 925
 926                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 927                             inp->inp_lport != lport) {
 928                                 continue;
 929                         }
 930
 931                         injail = prison_flag(inp->inp_cred, PR_IP6);
 932                         if (injail) {
 933                                 if (prison_check_ip6(inp->inp_cred,
 934                                     laddr) != 0)
 935                                         continue;
 936                         } else {
 937                                 if (local_exact != NULL)
 938                                         continue;
 939                         }
 940
 941                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
 942                                 if (injail)
 943                                         goto found;
 944                                 else
 945                                         local_exact = inp;
 946                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 947                                 if (injail)
 948                                         jail_wild = inp;
 949                                 else
 950                                         local_wild = inp;
 951                         }
 952                 } /* LIST_FOREACH */
 953
 954                 inp = jail_wild;
 955                 if (inp == NULL)
 956                         inp = jail_wild;
 957                 if (inp == NULL)
 958                         inp = local_exact;
 959                 if (inp == NULL)
 960                         inp = local_wild;
 961                 if (inp != NULL)
 962                         goto found;
 963         }
 964
 965         /*
 966          * Then look for a wildcard match, if requested.
 967          */
 968         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 969                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 970                 struct inpcb *jail_wild = NULL;
 971                 int injail;
 972
 973                 /*
 974                  * Order of socket selection - we always prefer jails.
 975                  *      1. jailed, non-wild.
 976                  *      2. jailed, wild.
 977                  *      3. non-jailed, non-wild.
 978                  *      4. non-jailed, wild.
 979                  */
 980                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(
 981                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
 982                     pcbinfo->ipi_wildmask)];
 983                 LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
 984                         /* XXX inp locking */
 985                         if ((inp->inp_vflag & INP_IPV6) == 0)
 986                                 continue;
 987
 988                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 989                             inp->inp_lport != lport) {
 990                                 continue;
 991                         }
 992
 993                         injail = prison_flag(inp->inp_cred, PR_IP6);
 994                         if (injail) {
 995                                 if (prison_check_ip6(inp->inp_cred,
 996                                     laddr) != 0)
 997                                         continue;
 998                         } else {
 999                                 if (local_exact != NULL)
1000                                         continue;
1001                         }
1002
1003                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1004                                 if (injail)
1005                                         goto found;
1006                                 else
1007                                         local_exact = inp;
1008                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1009                                 if (injail)
1010                                         jail_wild = inp;
1011                                 else
1012                                         local_wild = inp;
1013                         }
1014                 } /* LIST_FOREACH */
1015
1016                 inp = jail_wild;
1017                 if (inp == NULL)
1018                         inp = jail_wild;
1019                 if (inp == NULL)
1020                         inp = local_exact;
1021                 if (inp == NULL)
1022                         inp = local_wild;
1023                 if (inp != NULL)
1024                         goto found;
1025         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1026         INP_GROUP_UNLOCK(pcbgroup);
1027         return (NULL);
1028
1029 found:
1030         if (lookupflags & INPLOOKUP_WLOCKPCB)
1031                 locked = INP_TRY_WLOCK(inp);
1032         else if (lookupflags & INPLOOKUP_RLOCKPCB)
1033                 locked = INP_TRY_RLOCK(inp);
1034         else
1035                 panic("%s: locking buf", __func__);
1036         if (!locked)
1037                 in_pcbref(inp);
1038         INP_GROUP_UNLOCK(pcbgroup);
1039         if (!locked) {
1040                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
1041                         INP_WLOCK(inp);
1042                         if (in_pcbrele_wlocked(inp))
1043                                 return (NULL);
1044                 } else {
1045                         INP_RLOCK(inp);
1046                         if (in_pcbrele_rlocked(inp))
1047                                 return (NULL);
1048                 }
1049         }
1050 #ifdef INVARIANTS
1051         if (lookupflags & INPLOOKUP_WLOCKPCB)
1052                 INP_WLOCK_ASSERT(inp);
1053         else
1054                 INP_RLOCK_ASSERT(inp);
1055 #endif
1056         return (inp);
1057 }
1058 #endif /* PCBGROUP */
1059
1060 /*
1061  * Lookup PCB in hash list.
1062  */
1063 static struct inpcb *
1064 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1065     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1066     int lookupflags, struct ifnet *ifp)
1067 {
1068         struct inpcbhead *head;
1069         struct inpcb *inp, *tmpinp;
1070         u_short fport = fport_arg, lport = lport_arg;
1071
1072         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
1073             ("%s: invalid lookup flags %d", __func__, lookupflags));
1074
1075         INP_HASH_LOCK_ASSERT(pcbinfo);
1076
1077         /*
1078          * First look for an exact match.
1079          */
1080         tmpinp = NULL;
1081         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1082             INP6_PCBHASHKEY(faddr), lport, fport, pcbinfo->ipi_hashmask)];
1083         LIST_FOREACH(inp, head, inp_hash) {
1084                 /* XXX inp locking */
1085                 if ((inp->inp_vflag & INP_IPV6) == 0)
1086                         continue;
1087                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1088                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1089                     inp->inp_fport == fport &&
1090                     inp->inp_lport == lport) {
1091                         /*
1092                          * XXX We should be able to directly return
1093                          * the inp here, without any checks.
1094                          * Well unless both bound with SO_REUSEPORT?
1095                          */
1096                         if (prison_flag(inp->inp_cred, PR_IP6))
1097                                 return (inp);
1098                         if (tmpinp == NULL)
1099                                 tmpinp = inp;
1100                 }
1101         }
1102         if (tmpinp != NULL)
1103                 return (tmpinp);
1104
1105         /*
1106          * Then look for a wildcard match, if requested.
1107          */
1108         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
1109                 struct inpcb *local_wild = NULL, *local_exact = NULL;
1110                 struct inpcb *jail_wild = NULL;
1111                 int injail;
1112
1113                 /*
1114                  * Order of socket selection - we always prefer jails.
1115                  *      1. jailed, non-wild.
1116                  *      2. jailed, wild.
1117                  *      3. non-jailed, non-wild.
1118                  *      4. non-jailed, wild.
1119                  */
1120                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
1121                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
1122                     pcbinfo->ipi_hashmask)];
1123                 LIST_FOREACH(inp, head, inp_hash) {
1124                         /* XXX inp locking */
1125                         if ((inp->inp_vflag & INP_IPV6) == 0)
1126                                 continue;
1127
1128                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
1129                             inp->inp_lport != lport) {
1130                                 continue;
1131                         }
1132
1133                         injail = prison_flag(inp->inp_cred, PR_IP6);
1134                         if (injail) {
1135                                 if (prison_check_ip6(inp->inp_cred,
1136                                     laddr) != 0)
1137                                         continue;
1138                         } else {
1139                                 if (local_exact != NULL)
1140                                         continue;
1141                         }
1142
1143                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
1144                                 if (injail)
1145                                         return (inp);
1146                                 else
1147                                         local_exact = inp;
1148                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1149                                 if (injail)
1150                                         jail_wild = inp;
1151                                 else
1152                                         local_wild = inp;
1153                         }
1154                 } /* LIST_FOREACH */
1155
1156                 if (jail_wild != NULL)
1157                         return (jail_wild);
1158                 if (local_exact != NULL)
1159                         return (local_exact);
1160                 if (local_wild != NULL)
1161                         return (local_wild);
1162         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
1163
1164         /*
1165          * Not found.
1166          */
1167         return (NULL);
1168 }
1169
1170 /*
1171  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
1172  * hash list lock, and will return the inpcb locked (i.e., requires
1173  * INPLOOKUP_LOCKPCB).
1174  */
1175 static struct inpcb *
1176 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1177     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1178     struct ifnet *ifp)
1179 {
1180         struct inpcb *inp;
1181         bool locked;
1182
1183         INP_HASH_RLOCK(pcbinfo);
1184         inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
1185             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
1186         if (inp != NULL) {
1187                 if (lookupflags & INPLOOKUP_WLOCKPCB)
1188                         locked = INP_TRY_WLOCK(inp);
1189                 else if (lookupflags & INPLOOKUP_RLOCKPCB)
1190                         locked = INP_TRY_RLOCK(inp);
1191                 else
1192                         panic("%s: locking bug", __func__);
1193                 if (!locked)
1194                         in_pcbref(inp);
1195                 INP_HASH_RUNLOCK(pcbinfo);
1196                 if (!locked) {
1197                         if (lookupflags & INPLOOKUP_WLOCKPCB) {
1198                                 INP_WLOCK(inp);
1199                                 if (in_pcbrele_wlocked(inp))
1200                                         return (NULL);
1201                         } else {
1202                                 INP_RLOCK(inp);
1203                                 if (in_pcbrele_rlocked(inp))
1204                                         return (NULL);
1205                         }
1206                 }
1207 #ifdef INVARIANTS
1208                 if (lookupflags & INPLOOKUP_WLOCKPCB)
1209                         INP_WLOCK_ASSERT(inp);
1210                 else
1211                         INP_RLOCK_ASSERT(inp);
1212 #endif
1213         } else
1214                 INP_HASH_RUNLOCK(pcbinfo);
1215         return (inp);
1216 }
1217
1218 /*
1219  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
1220  * from which a pre-calculated hash value may be extracted.
1221  *
1222  * Possibly more of this logic should be in in6_pcbgroup.c.
1223  */
1224 struct inpcb *
1225 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
1226     struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
1227 {
1228 #if defined(PCBGROUP) && !defined(RSS)
1229         struct inpcbgroup *pcbgroup;
1230 #endif
1231
1232         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1233             ("%s: invalid lookup flags %d", __func__, lookupflags));
1234         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1235             ("%s: LOCKPCB not set", __func__));
1236
1237         /*
1238          * When not using RSS, use connection groups in preference to the
1239          * reservation table when looking up 4-tuples.  When using RSS, just
1240          * use the reservation table, due to the cost of the Toeplitz hash
1241          * in software.
1242          *
1243          * XXXRW: This policy belongs in the pcbgroup code, as in principle
1244          * we could be doing RSS with a non-Toeplitz hash that is affordable
1245          * in software.
1246          */
1247 #if defined(PCBGROUP) && !defined(RSS)
1248         if (in_pcbgroup_enabled(pcbinfo)) {
1249                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1250                     fport);
1251                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1252                     laddr, lport, lookupflags, ifp));
1253         }
1254 #endif
1255         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1256             lookupflags, ifp));
1257 }
1258
1259 struct inpcb *
1260 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1261     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
1262     struct ifnet *ifp, struct mbuf *m)
1263 {
1264 #ifdef PCBGROUP
1265         struct inpcbgroup *pcbgroup;
1266 #endif
1267
1268         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
1269             ("%s: invalid lookup flags %d", __func__, lookupflags));
1270         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
1271             ("%s: LOCKPCB not set", __func__));
1272
1273 #ifdef PCBGROUP
1274         /*
1275          * If we can use a hardware-generated hash to look up the connection
1276          * group, use that connection group to find the inpcb.  Otherwise
1277          * fall back on a software hash -- or the reservation table if we're
1278          * using RSS.
1279          *
1280          * XXXRW: As above, that policy belongs in the pcbgroup code.
1281          */
1282         if (in_pcbgroup_enabled(pcbinfo) &&
1283             M_HASHTYPE_TEST(m, M_HASHTYPE_NONE) == 0) {
1284                 pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
1285                     m->m_pkthdr.flowid);
1286                 if (pcbgroup != NULL)
1287                         return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
1288                             fport, laddr, lport, lookupflags, ifp));
1289 #ifndef RSS
1290                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
1291                     fport);
1292                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
1293                     laddr, lport, lookupflags, ifp));
1294 #endif
1295         }
1296 #endif
1297         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
1298             lookupflags, ifp));
1299 }
1300
1301 void
1302 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst)
1303 {
1304         struct ip6_hdr *ip;
1305
1306         ip = mtod(m, struct ip6_hdr *);
1307         bzero(sin6, sizeof(*sin6));
1308         sin6->sin6_len = sizeof(*sin6);
1309         sin6->sin6_family = AF_INET6;
1310         sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src;
1311
1312         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
1313
1314         return;
1315 }