The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet6/in6_pcb.c

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    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: releng/12.0/sys/netinet6/in6_pcb.c 338969 2018-09-27 15:32:37Z bz $");
   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 ifaddr *ifa;
  184 
  185                         sin6->sin6_port = 0;            /* yech... */
  186                         NET_EPOCH_ENTER();
  187                         if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
  188                             NULL &&
  189                             (inp->inp_flags & INP_BINDANY) == 0) {
  190                                 NET_EPOCH_EXIT();
  191                                 return (EADDRNOTAVAIL);
  192                         }
  193 
  194                         /*
  195                          * XXX: bind to an anycast address might accidentally
  196                          * cause sending a packet with anycast source address.
  197                          * We should allow to bind to a deprecated address, since
  198                          * the application dares to use it.
  199                          */
  200                         if (ifa != NULL &&
  201                             ((struct in6_ifaddr *)ifa)->ia6_flags &
  202                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
  203                                 NET_EPOCH_EXIT();
  204                                 return (EADDRNOTAVAIL);
  205                         }
  206                         NET_EPOCH_EXIT();
  207                 }
  208                 if (lport) {
  209                         struct inpcb *t;
  210                         struct tcptw *tw;
  211 
  212                         /* GROSS */
  213                         if (ntohs(lport) <= V_ipport_reservedhigh &&
  214                             ntohs(lport) >= V_ipport_reservedlow &&
  215                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
  216                             0))
  217                                 return (EACCES);
  218                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
  219                             priv_check_cred(inp->inp_cred,
  220                             PRIV_NETINET_REUSEPORT, 0) != 0) {
  221                                 t = in6_pcblookup_local(pcbinfo,
  222                                     &sin6->sin6_addr, lport,
  223                                     INPLOOKUP_WILDCARD, cred);
  224                                 if (t &&
  225                                     ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
  226                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
  227                                     (so->so_type != SOCK_STREAM ||
  228                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
  229                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
  230                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
  231                                      (t->inp_flags2 & INP_REUSEPORT) ||
  232                                      (t->inp_flags2 & INP_REUSEPORT_LB) == 0) &&
  233                                     (inp->inp_cred->cr_uid !=
  234                                      t->inp_cred->cr_uid))
  235                                         return (EADDRINUSE);
  236 
  237                                 /*
  238                                  * If the socket is a BINDMULTI socket, then
  239                                  * the credentials need to match and the
  240                                  * original socket also has to have been bound
  241                                  * with BINDMULTI.
  242                                  */
  243                                 if (t && (! in_pcbbind_check_bindmulti(inp, t)))
  244                                         return (EADDRINUSE);
  245 
  246 #ifdef INET
  247                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
  248                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  249                                         struct sockaddr_in sin;
  250 
  251                                         in6_sin6_2_sin(&sin, sin6);
  252                                         t = in_pcblookup_local(pcbinfo,
  253                                             sin.sin_addr, lport,
  254                                             INPLOOKUP_WILDCARD, cred);
  255                                         if (t &&
  256                                             ((inp->inp_flags2 & INP_BINDMULTI) == 0) &&
  257                                             ((t->inp_flags &
  258                                               INP_TIMEWAIT) == 0) &&
  259                                             (so->so_type != SOCK_STREAM ||
  260                                              ntohl(t->inp_faddr.s_addr) ==
  261                                               INADDR_ANY) &&
  262                                             (inp->inp_cred->cr_uid !=
  263                                              t->inp_cred->cr_uid))
  264                                                 return (EADDRINUSE);
  265 
  266                                         if (t && (! in_pcbbind_check_bindmulti(inp, t)))
  267                                                 return (EADDRINUSE);
  268                                 }
  269 #endif
  270                         }
  271                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
  272                             lport, lookupflags, cred);
  273                         if (t && (t->inp_flags & INP_TIMEWAIT)) {
  274                                 /*
  275                                  * XXXRW: If an incpb has had its timewait
  276                                  * state recycled, we treat the address as
  277                                  * being in use (for now).  This is better
  278                                  * than a panic, but not desirable.
  279                                  */
  280                                 tw = intotw(t);
  281                                 if (tw == NULL ||
  282                                     ((reuseport & tw->tw_so_options) == 0 &&
  283                                          (reuseport_lb & tw->tw_so_options) == 0))
  284                                         return (EADDRINUSE);
  285                         } else if (t && (reuseport & inp_so_options(t)) == 0 &&
  286                                            (reuseport_lb & inp_so_options(t)) == 0) {
  287                                 return (EADDRINUSE);
  288                         }
  289 #ifdef INET
  290                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
  291                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  292                                 struct sockaddr_in sin;
  293 
  294                                 in6_sin6_2_sin(&sin, sin6);
  295                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
  296                                    lport, lookupflags, cred);
  297                                 if (t && t->inp_flags & INP_TIMEWAIT) {
  298                                         tw = intotw(t);
  299                                         if (tw == NULL)
  300                                                 return (EADDRINUSE);
  301                                         if ((reuseport & tw->tw_so_options) == 0
  302                                             && (reuseport_lb & tw->tw_so_options) == 0
  303                                             && (ntohl(t->inp_laddr.s_addr) !=
  304                                                 INADDR_ANY || ((inp->inp_vflag &
  305                                                         INP_IPV6PROTO) ==
  306                                                     (t->inp_vflag & INP_IPV6PROTO))))
  307                                                 return (EADDRINUSE);
  308                                 } else if (t &&
  309                                     (reuseport & inp_so_options(t)) == 0 &&
  310                                     (reuseport_lb & inp_so_options(t)) == 0 &&
  311                                     (ntohl(t->inp_laddr.s_addr) != INADDR_ANY ||
  312                                         (t->inp_vflag & INP_IPV6PROTO) != 0)) {
  313                                         return (EADDRINUSE);
  314                                 }
  315                         }
  316 #endif
  317                 }
  318                 inp->in6p_laddr = sin6->sin6_addr;
  319         }
  320         if (lport == 0) {
  321                 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
  322                         /* Undo an address bind that may have occurred. */
  323                         inp->in6p_laddr = in6addr_any;
  324                         return (error);
  325                 }
  326         } else {
  327                 inp->inp_lport = lport;
  328                 if (in_pcbinshash(inp) != 0) {
  329                         inp->in6p_laddr = in6addr_any;
  330                         inp->inp_lport = 0;
  331                         return (EAGAIN);
  332                 }
  333         }
  334         return (0);
  335 }
  336 
  337 /*
  338  *   Transform old in6_pcbconnect() into an inner subroutine for new
  339  *   in6_pcbconnect(): Do some validity-checking on the remote
  340  *   address (in mbuf 'nam') and then determine local host address
  341  *   (i.e., which interface) to use to access that remote host.
  342  *
  343  *   This preserves definition of in6_pcbconnect(), while supporting a
  344  *   slightly different version for T/TCP.  (This is more than
  345  *   a bit of a kludge, but cleaning up the internal interfaces would
  346  *   have forced minor changes in every protocol).
  347  */
  348 static int
  349 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
  350     struct in6_addr *plocal_addr6)
  351 {
  352         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
  353         int error = 0;
  354         int scope_ambiguous = 0;
  355         struct in6_addr in6a;
  356 
  357         INP_WLOCK_ASSERT(inp);
  358         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);        /* XXXRW: why? */
  359 
  360         if (nam->sa_len != sizeof (*sin6))
  361                 return (EINVAL);
  362         if (sin6->sin6_family != AF_INET6)
  363                 return (EAFNOSUPPORT);
  364         if (sin6->sin6_port == 0)
  365                 return (EADDRNOTAVAIL);
  366 
  367         if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
  368                 scope_ambiguous = 1;
  369         if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
  370                 return(error);
  371 
  372         if (!CK_STAILQ_EMPTY(&V_in6_ifaddrhead)) {
  373                 /*
  374                  * If the destination address is UNSPECIFIED addr,
  375                  * use the loopback addr, e.g ::1.
  376                  */
  377                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
  378                         sin6->sin6_addr = in6addr_loopback;
  379         }
  380         if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
  381                 return (error);
  382 
  383         error = in6_selectsrc_socket(sin6, inp->in6p_outputopts,
  384             inp, inp->inp_cred, scope_ambiguous, &in6a, NULL);
  385         if (error)
  386                 return (error);
  387 
  388         /*
  389          * Do not update this earlier, in case we return with an error.
  390          *
  391          * XXX: this in6_selectsrc_socket result might replace the bound local
  392          * address with the address specified by setsockopt(IPV6_PKTINFO).
  393          * Is it the intended behavior?
  394          */
  395         *plocal_addr6 = in6a;
  396 
  397         /*
  398          * Don't do pcblookup call here; return interface in
  399          * plocal_addr6
  400          * and exit to caller, that will do the lookup.
  401          */
  402 
  403         return (0);
  404 }
  405 
  406 /*
  407  * Outer subroutine:
  408  * Connect from a socket to a specified address.
  409  * Both address and port must be specified in argument sin.
  410  * If don't have a local address for this socket yet,
  411  * then pick one.
  412  */
  413 int
  414 in6_pcbconnect_mbuf(struct inpcb *inp, struct sockaddr *nam,
  415     struct ucred *cred, struct mbuf *m)
  416 {
  417         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  418         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
  419         struct in6_addr addr6;
  420         int error;
  421 
  422         INP_WLOCK_ASSERT(inp);
  423         INP_HASH_WLOCK_ASSERT(pcbinfo);
  424 
  425         /*
  426          * Call inner routine, to assign local interface address.
  427          * in6_pcbladdr() may automatically fill in sin6_scope_id.
  428          */
  429         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
  430                 return (error);
  431 
  432         if (in6_pcblookup_hash_locked(pcbinfo, &sin6->sin6_addr,
  433                                sin6->sin6_port,
  434                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
  435                               ? &addr6 : &inp->in6p_laddr,
  436                               inp->inp_lport, 0, NULL) != NULL) {
  437                 return (EADDRINUSE);
  438         }
  439         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  440                 if (inp->inp_lport == 0) {
  441                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
  442                         if (error)
  443                                 return (error);
  444                 }
  445                 inp->in6p_laddr = addr6;
  446         }
  447         inp->in6p_faddr = sin6->sin6_addr;
  448         inp->inp_fport = sin6->sin6_port;
  449         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
  450         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
  451         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
  452                 inp->inp_flow |=
  453                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
  454 
  455         in_pcbrehash_mbuf(inp, m);
  456 
  457         return (0);
  458 }
  459 
  460 int
  461 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct ucred *cred)
  462 {
  463 
  464         return (in6_pcbconnect_mbuf(inp, nam, cred, NULL));
  465 }
  466 
  467 void
  468 in6_pcbdisconnect(struct inpcb *inp)
  469 {
  470 
  471         INP_WLOCK_ASSERT(inp);
  472         INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
  473 
  474         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
  475         inp->inp_fport = 0;
  476         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
  477         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
  478         in_pcbrehash(inp);
  479 }
  480 
  481 struct sockaddr *
  482 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
  483 {
  484         struct sockaddr_in6 *sin6;
  485 
  486         sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
  487         bzero(sin6, sizeof *sin6);
  488         sin6->sin6_family = AF_INET6;
  489         sin6->sin6_len = sizeof(*sin6);
  490         sin6->sin6_port = port;
  491         sin6->sin6_addr = *addr_p;
  492         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
  493 
  494         return (struct sockaddr *)sin6;
  495 }
  496 
  497 struct sockaddr *
  498 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
  499 {
  500         struct sockaddr_in sin;
  501         struct sockaddr_in6 *sin6_p;
  502 
  503         bzero(&sin, sizeof sin);
  504         sin.sin_family = AF_INET;
  505         sin.sin_len = sizeof(sin);
  506         sin.sin_port = port;
  507         sin.sin_addr = *addr_p;
  508 
  509         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
  510                 M_WAITOK);
  511         in6_sin_2_v4mapsin6(&sin, sin6_p);
  512 
  513         return (struct sockaddr *)sin6_p;
  514 }
  515 
  516 int
  517 in6_getsockaddr(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_getsockaddr: inp == NULL"));
  525 
  526         INP_RLOCK(inp);
  527         port = inp->inp_lport;
  528         addr = inp->in6p_laddr;
  529         INP_RUNLOCK(inp);
  530 
  531         *nam = in6_sockaddr(port, &addr);
  532         return 0;
  533 }
  534 
  535 int
  536 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
  537 {
  538         struct inpcb *inp;
  539         struct in6_addr addr;
  540         in_port_t port;
  541 
  542         inp = sotoinpcb(so);
  543         KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
  544 
  545         INP_RLOCK(inp);
  546         port = inp->inp_fport;
  547         addr = inp->in6p_faddr;
  548         INP_RUNLOCK(inp);
  549 
  550         *nam = in6_sockaddr(port, &addr);
  551         return 0;
  552 }
  553 
  554 int
  555 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
  556 {
  557         struct  inpcb *inp;
  558         int     error;
  559 
  560         inp = sotoinpcb(so);
  561         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
  562 
  563 #ifdef INET
  564         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
  565                 error = in_getsockaddr(so, nam);
  566                 if (error == 0)
  567                         in6_sin_2_v4mapsin6_in_sock(nam);
  568         } else
  569 #endif
  570         {
  571                 /* scope issues will be handled in in6_getsockaddr(). */
  572                 error = in6_getsockaddr(so, nam);
  573         }
  574 
  575         return error;
  576 }
  577 
  578 int
  579 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
  580 {
  581         struct  inpcb *inp;
  582         int     error;
  583 
  584         inp = sotoinpcb(so);
  585         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
  586 
  587 #ifdef INET
  588         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
  589                 error = in_getpeeraddr(so, nam);
  590                 if (error == 0)
  591                         in6_sin_2_v4mapsin6_in_sock(nam);
  592         } else
  593 #endif
  594         /* scope issues will be handled in in6_getpeeraddr(). */
  595         error = in6_getpeeraddr(so, nam);
  596 
  597         return error;
  598 }
  599 
  600 /*
  601  * Pass some notification to all connections of a protocol
  602  * associated with address dst.  The local address and/or port numbers
  603  * may be specified to limit the search.  The "usual action" will be
  604  * taken, depending on the ctlinput cmd.  The caller must filter any
  605  * cmds that are uninteresting (e.g., no error in the map).
  606  * Call the protocol specific routine (if any) to report
  607  * any errors for each matching socket.
  608  */
  609 void
  610 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
  611     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
  612     int cmd, void *cmdarg,
  613     struct inpcb *(*notify)(struct inpcb *, int))
  614 {
  615         struct inpcb *inp, *inp_temp;
  616         struct sockaddr_in6 sa6_src, *sa6_dst;
  617         u_short fport = fport_arg, lport = lport_arg;
  618         u_int32_t flowinfo;
  619         int errno;
  620 
  621         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
  622                 return;
  623 
  624         sa6_dst = (struct sockaddr_in6 *)dst;
  625         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
  626                 return;
  627 
  628         /*
  629          * note that src can be NULL when we get notify by local fragmentation.
  630          */
  631         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
  632         flowinfo = sa6_src.sin6_flowinfo;
  633 
  634         /*
  635          * Redirects go to all references to the destination,
  636          * and use in6_rtchange to invalidate the route cache.
  637          * Dead host indications: also use in6_rtchange to invalidate
  638          * the cache, and deliver the error to all the sockets.
  639          * Otherwise, if we have knowledge of the local port and address,
  640          * deliver only to that socket.
  641          */
  642         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
  643                 fport = 0;
  644                 lport = 0;
  645                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
  646 
  647                 if (cmd != PRC_HOSTDEAD)
  648                         notify = in6_rtchange;
  649         }
  650         errno = inet6ctlerrmap[cmd];
  651         INP_INFO_WLOCK(pcbinfo);
  652         CK_LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
  653                 INP_WLOCK(inp);
  654                 if ((inp->inp_vflag & INP_IPV6) == 0) {
  655                         INP_WUNLOCK(inp);
  656                         continue;
  657                 }
  658 
  659                 /*
  660                  * If the error designates a new path MTU for a destination
  661                  * and the application (associated with this socket) wanted to
  662                  * know the value, notify.
  663                  * XXX: should we avoid to notify the value to TCP sockets?
  664                  */
  665                 if (cmd == PRC_MSGSIZE && cmdarg != NULL)
  666                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
  667                                         *(u_int32_t *)cmdarg);
  668 
  669                 /*
  670                  * Detect if we should notify the error. If no source and
  671                  * destination ports are specifed, but non-zero flowinfo and
  672                  * local address match, notify the error. This is the case
  673                  * when the error is delivered with an encrypted buffer
  674                  * by ESP. Otherwise, just compare addresses and ports
  675                  * as usual.
  676                  */
  677                 if (lport == 0 && fport == 0 && flowinfo &&
  678                     inp->inp_socket != NULL &&
  679                     flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
  680                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
  681                         goto do_notify;
  682                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  683                                              &sa6_dst->sin6_addr) ||
  684                          inp->inp_socket == 0 ||
  685                          (lport && inp->inp_lport != lport) ||
  686                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
  687                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  688                                               &sa6_src.sin6_addr)) ||
  689                          (fport && inp->inp_fport != fport)) {
  690                         INP_WUNLOCK(inp);
  691                         continue;
  692                 }
  693 
  694           do_notify:
  695                 if (notify) {
  696                         if ((*notify)(inp, errno))
  697                                 INP_WUNLOCK(inp);
  698                 } else
  699                         INP_WUNLOCK(inp);
  700         }
  701         INP_INFO_WUNLOCK(pcbinfo);
  702 }
  703 
  704 /*
  705  * Lookup a PCB based on the local address and port.  Caller must hold the
  706  * hash lock.  No inpcb locks or references are acquired.
  707  */
  708 struct inpcb *
  709 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
  710     u_short lport, int lookupflags, struct ucred *cred)
  711 {
  712         struct inpcb *inp;
  713         int matchwild = 3, wildcard;
  714 
  715         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
  716             ("%s: invalid lookup flags %d", __func__, lookupflags));
  717 
  718         INP_HASH_WLOCK_ASSERT(pcbinfo);
  719 
  720         if ((lookupflags & INPLOOKUP_WILDCARD) == 0) {
  721                 struct inpcbhead *head;
  722                 /*
  723                  * Look for an unconnected (wildcard foreign addr) PCB that
  724                  * matches the local address and port we're looking for.
  725                  */
  726                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
  727                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
  728                     pcbinfo->ipi_hashmask)];
  729                 CK_LIST_FOREACH(inp, head, inp_hash) {
  730                         /* XXX inp locking */
  731                         if ((inp->inp_vflag & INP_IPV6) == 0)
  732                                 continue;
  733                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
  734                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
  735                             inp->inp_lport == lport) {
  736                                 /* Found. */
  737                                 if (cred == NULL ||
  738                                     prison_equal_ip6(cred->cr_prison,
  739                                         inp->inp_cred->cr_prison))
  740                                         return (inp);
  741                         }
  742                 }
  743                 /*
  744                  * Not found.
  745                  */
  746                 return (NULL);
  747         } else {
  748                 struct inpcbporthead *porthash;
  749                 struct inpcbport *phd;
  750                 struct inpcb *match = NULL;
  751                 /*
  752                  * Best fit PCB lookup.
  753                  *
  754                  * First see if this local port is in use by looking on the
  755                  * port hash list.
  756                  */
  757                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
  758                     pcbinfo->ipi_porthashmask)];
  759                 CK_LIST_FOREACH(phd, porthash, phd_hash) {
  760                         if (phd->phd_port == lport)
  761                                 break;
  762                 }
  763                 if (phd != NULL) {
  764                         /*
  765                          * Port is in use by one or more PCBs. Look for best
  766                          * fit.
  767                          */
  768                         CK_LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
  769                                 wildcard = 0;
  770                                 if (cred != NULL &&
  771                                     !prison_equal_ip6(cred->cr_prison,
  772                                         inp->inp_cred->cr_prison))
  773                                         continue;
  774                                 /* XXX inp locking */
  775                                 if ((inp->inp_vflag & INP_IPV6) == 0)
  776                                         continue;
  777                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
  778                                         wildcard++;
  779                                 if (!IN6_IS_ADDR_UNSPECIFIED(
  780                                         &inp->in6p_laddr)) {
  781                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
  782                                                 wildcard++;
  783                                         else if (!IN6_ARE_ADDR_EQUAL(
  784                                             &inp->in6p_laddr, laddr))
  785                                                 continue;
  786                                 } else {
  787                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
  788                                                 wildcard++;
  789                                 }
  790                                 if (wildcard < matchwild) {
  791                                         match = inp;
  792                                         matchwild = wildcard;
  793                                         if (matchwild == 0)
  794                                                 break;
  795                                 }
  796                         }
  797                 }
  798                 return (match);
  799         }
  800 }
  801 
  802 void
  803 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
  804 {
  805         struct inpcb *in6p;
  806         struct ip6_moptions *im6o;
  807         int i, gap;
  808 
  809         INP_INFO_WLOCK(pcbinfo);
  810         CK_LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
  811                 INP_WLOCK(in6p);
  812                 if (__predict_false(in6p->inp_flags2 & INP_FREED)) {
  813                         INP_WUNLOCK(in6p);
  814                         continue;
  815                 }
  816                 im6o = in6p->in6p_moptions;
  817                 if ((in6p->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                         gap = 0;
  829                         for (i = 0; i < im6o->im6o_num_memberships; i++) {
  830                                 if (im6o->im6o_membership[i]->in6m_ifp ==
  831                                     ifp) {
  832                                         in6_leavegroup(im6o->im6o_membership[i], NULL);
  833                                         gap++;
  834                                 } else if (gap != 0) {
  835                                         im6o->im6o_membership[i - gap] =
  836                                             im6o->im6o_membership[i];
  837                                 }
  838                         }
  839                         im6o->im6o_num_memberships -= gap;
  840                 }
  841                 INP_WUNLOCK(in6p);
  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 = NULL;
  877         const struct inpcblbgrouphead *hdr;
  878         struct inpcblbgroup *grp;
  879         struct inpcblbgroup *grp_local_wild;
  880         uint32_t idx;
  881 
  882         INP_HASH_LOCK_ASSERT(pcbinfo);
  883 
  884         hdr = &pcbinfo->ipi_lbgrouphashbase[INP_PCBLBGROUP_PORTHASH(
  885             lport, pcbinfo->ipi_lbgrouphashmask)];
  886 
  887         /*
  888          * Order of socket selection:
  889          * 1. non-wild.
  890          * 2. wild (if lookupflags contains INPLOOKUP_WILDCARD).
  891          *
  892          * NOTE:
  893          * - Load balanced group does not contain jailed sockets.
  894          * - Load balanced does not contain IPv4 mapped INET6 wild sockets.
  895          */
  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                         idx = 0;
  903                         int pkt_hash = INP_PCBLBGROUP_PKTHASH(
  904                             INP6_PCBHASHKEY(faddr), lport, fport);
  905 
  906                         idx = pkt_hash % grp->il_inpcnt;
  907 
  908                         if (IN6_ARE_ADDR_EQUAL(&grp->il6_laddr, laddr)) {
  909                                 return (grp->il_inp[idx]);
  910                         } else {
  911                                 if (IN6_IS_ADDR_UNSPECIFIED(&grp->il6_laddr) &&
  912                                     (lookupflags & INPLOOKUP_WILDCARD)) {
  913                                         local_wild = grp->il_inp[idx];
  914                                         grp_local_wild = grp;
  915                                 }
  916                         }
  917                 }
  918         }
  919         if (local_wild != NULL) {
  920                 return (local_wild);
  921         }
  922         return (NULL);
  923 }
  924 
  925 #ifdef PCBGROUP
  926 /*
  927  * Lookup PCB in hash list, using pcbgroup tables.
  928  */
  929 static struct inpcb *
  930 in6_pcblookup_group(struct inpcbinfo *pcbinfo, struct inpcbgroup *pcbgroup,
  931     struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr,
  932     u_int lport_arg, int lookupflags, struct ifnet *ifp)
  933 {
  934         struct inpcbhead *head;
  935         struct inpcb *inp, *tmpinp;
  936         u_short fport = fport_arg, lport = lport_arg;
  937         bool locked;
  938 
  939         /*
  940          * First look for an exact match.
  941          */
  942         tmpinp = NULL;
  943         INP_GROUP_LOCK(pcbgroup);
  944         head = &pcbgroup->ipg_hashbase[INP_PCBHASH(
  945             INP6_PCBHASHKEY(faddr), lport, fport, pcbgroup->ipg_hashmask)];
  946         CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
  947                 /* XXX inp locking */
  948                 if ((inp->inp_vflag & INP_IPV6) == 0)
  949                         continue;
  950                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
  951                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
  952                     inp->inp_fport == fport &&
  953                     inp->inp_lport == lport) {
  954                         /*
  955                          * XXX We should be able to directly return
  956                          * the inp here, without any checks.
  957                          * Well unless both bound with SO_REUSEPORT?
  958                          */
  959                         if (prison_flag(inp->inp_cred, PR_IP6))
  960                                 goto found;
  961                         if (tmpinp == NULL)
  962                                 tmpinp = inp;
  963                 }
  964         }
  965         if (tmpinp != NULL) {
  966                 inp = tmpinp;
  967                 goto found;
  968         }
  969 
  970         /*
  971          * Then look for a wildcard match in the pcbgroup.
  972          */
  973         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
  974                 struct inpcb *local_wild = NULL, *local_exact = NULL;
  975                 struct inpcb *jail_wild = NULL;
  976                 int injail;
  977 
  978                 /*
  979                  * Order of socket selection - we always prefer jails.
  980                  *      1. jailed, non-wild.
  981                  *      2. jailed, wild.
  982                  *      3. non-jailed, non-wild.
  983                  *      4. non-jailed, wild.
  984                  */
  985                 head = &pcbgroup->ipg_hashbase[
  986                     INP_PCBHASH(INADDR_ANY, lport, 0, pcbgroup->ipg_hashmask)];
  987                 CK_LIST_FOREACH(inp, head, inp_pcbgrouphash) {
  988                         /* XXX inp locking */
  989                         if ((inp->inp_vflag & INP_IPV6) == 0)
  990                                 continue;
  991 
  992                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
  993                             inp->inp_lport != lport) {
  994                                 continue;
  995                         }
  996 
  997                         injail = prison_flag(inp->inp_cred, PR_IP6);
  998                         if (injail) {
  999                                 if (prison_check_ip6(inp->inp_cred,
 1000                                     laddr) != 0)
 1001                                         continue;
 1002                         } else {
 1003                                 if (local_exact != NULL)
 1004                                         continue;
 1005                         }
 1006 
 1007                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
 1008                                 if (injail)
 1009                                         goto found;
 1010                                 else
 1011                                         local_exact = inp;
 1012                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 1013                                 if (injail)
 1014                                         jail_wild = inp;
 1015                                 else
 1016                                         local_wild = inp;
 1017                         }
 1018                 } /* LIST_FOREACH */
 1019 
 1020                 inp = jail_wild;
 1021                 if (inp == NULL)
 1022                         inp = jail_wild;
 1023                 if (inp == NULL)
 1024                         inp = local_exact;
 1025                 if (inp == NULL)
 1026                         inp = local_wild;
 1027                 if (inp != NULL)
 1028                         goto found;
 1029         }
 1030 
 1031         /*
 1032          * Then look for a wildcard match, if requested.
 1033          */
 1034         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 1035                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 1036                 struct inpcb *jail_wild = NULL;
 1037                 int injail;
 1038 
 1039                 /*
 1040                  * Order of socket selection - we always prefer jails.
 1041                  *      1. jailed, non-wild.
 1042                  *      2. jailed, wild.
 1043                  *      3. non-jailed, non-wild.
 1044                  *      4. non-jailed, wild.
 1045                  */
 1046                 head = &pcbinfo->ipi_wildbase[INP_PCBHASH(
 1047                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
 1048                     pcbinfo->ipi_wildmask)];
 1049                 CK_LIST_FOREACH(inp, head, inp_pcbgroup_wild) {
 1050                         /* XXX inp locking */
 1051                         if ((inp->inp_vflag & INP_IPV6) == 0)
 1052                                 continue;
 1053 
 1054                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 1055                             inp->inp_lport != lport) {
 1056                                 continue;
 1057                         }
 1058 
 1059                         injail = prison_flag(inp->inp_cred, PR_IP6);
 1060                         if (injail) {
 1061                                 if (prison_check_ip6(inp->inp_cred,
 1062                                     laddr) != 0)
 1063                                         continue;
 1064                         } else {
 1065                                 if (local_exact != NULL)
 1066                                         continue;
 1067                         }
 1068 
 1069                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
 1070                                 if (injail)
 1071                                         goto found;
 1072                                 else
 1073                                         local_exact = inp;
 1074                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 1075                                 if (injail)
 1076                                         jail_wild = inp;
 1077                                 else
 1078                                         local_wild = inp;
 1079                         }
 1080                 } /* LIST_FOREACH */
 1081 
 1082                 inp = jail_wild;
 1083                 if (inp == NULL)
 1084                         inp = jail_wild;
 1085                 if (inp == NULL)
 1086                         inp = local_exact;
 1087                 if (inp == NULL)
 1088                         inp = local_wild;
 1089                 if (inp != NULL)
 1090                         goto found;
 1091         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
 1092         INP_GROUP_UNLOCK(pcbgroup);
 1093         return (NULL);
 1094 
 1095 found:
 1096         if (lookupflags & INPLOOKUP_WLOCKPCB)
 1097                 locked = INP_TRY_WLOCK(inp);
 1098         else if (lookupflags & INPLOOKUP_RLOCKPCB)
 1099                 locked = INP_TRY_RLOCK(inp);
 1100         else
 1101                 panic("%s: locking buf", __func__);
 1102         if (!locked)
 1103                 in_pcbref(inp);
 1104         INP_GROUP_UNLOCK(pcbgroup);
 1105         if (!locked) {
 1106                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
 1107                         INP_WLOCK(inp);
 1108                         if (in_pcbrele_wlocked(inp))
 1109                                 return (NULL);
 1110                 } else {
 1111                         INP_RLOCK(inp);
 1112                         if (in_pcbrele_rlocked(inp))
 1113                                 return (NULL);
 1114                 }
 1115         }
 1116 #ifdef INVARIANTS
 1117         if (lookupflags & INPLOOKUP_WLOCKPCB)
 1118                 INP_WLOCK_ASSERT(inp);
 1119         else
 1120                 INP_RLOCK_ASSERT(inp);
 1121 #endif
 1122         return (inp);
 1123 }
 1124 #endif /* PCBGROUP */
 1125 
 1126 /*
 1127  * Lookup PCB in hash list.
 1128  */
 1129 static struct inpcb *
 1130 in6_pcblookup_hash_locked(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
 1131     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
 1132     int lookupflags, struct ifnet *ifp)
 1133 {
 1134         struct inpcbhead *head;
 1135         struct inpcb *inp, *tmpinp;
 1136         u_short fport = fport_arg, lport = lport_arg;
 1137 
 1138         KASSERT((lookupflags & ~(INPLOOKUP_WILDCARD)) == 0,
 1139             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1140 
 1141         INP_HASH_LOCK_ASSERT(pcbinfo);
 1142 
 1143         /*
 1144          * First look for an exact match.
 1145          */
 1146         tmpinp = NULL;
 1147         head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
 1148             INP6_PCBHASHKEY(faddr), lport, fport, pcbinfo->ipi_hashmask)];
 1149         CK_LIST_FOREACH(inp, head, inp_hash) {
 1150                 /* XXX inp locking */
 1151                 if ((inp->inp_vflag & INP_IPV6) == 0)
 1152                         continue;
 1153                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
 1154                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
 1155                     inp->inp_fport == fport &&
 1156                     inp->inp_lport == lport) {
 1157                         /*
 1158                          * XXX We should be able to directly return
 1159                          * the inp here, without any checks.
 1160                          * Well unless both bound with SO_REUSEPORT?
 1161                          */
 1162                         if (prison_flag(inp->inp_cred, PR_IP6))
 1163                                 return (inp);
 1164                         if (tmpinp == NULL)
 1165                                 tmpinp = inp;
 1166                 }
 1167         }
 1168         if (tmpinp != NULL)
 1169                 return (tmpinp);
 1170 
 1171         /*
 1172          * Then look in lb group (for wildcard match).
 1173          */
 1174         if (pcbinfo->ipi_lbgrouphashbase != NULL &&
 1175             (lookupflags & INPLOOKUP_WILDCARD)) {
 1176                 inp = in6_pcblookup_lbgroup(pcbinfo, laddr, lport, faddr,
 1177                     fport, lookupflags);
 1178                 if (inp != NULL) {
 1179                         return (inp);
 1180                 }
 1181         }
 1182 
 1183         /*
 1184          * Then look for a wildcard match, if requested.
 1185          */
 1186         if ((lookupflags & INPLOOKUP_WILDCARD) != 0) {
 1187                 struct inpcb *local_wild = NULL, *local_exact = NULL;
 1188                 struct inpcb *jail_wild = NULL;
 1189                 int injail;
 1190 
 1191                 /*
 1192                  * Order of socket selection - we always prefer jails.
 1193                  *      1. jailed, non-wild.
 1194                  *      2. jailed, wild.
 1195                  *      3. non-jailed, non-wild.
 1196                  *      4. non-jailed, wild.
 1197                  */
 1198                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(
 1199                     INP6_PCBHASHKEY(&in6addr_any), lport, 0,
 1200                     pcbinfo->ipi_hashmask)];
 1201                 CK_LIST_FOREACH(inp, head, inp_hash) {
 1202                         /* XXX inp locking */
 1203                         if ((inp->inp_vflag & INP_IPV6) == 0)
 1204                                 continue;
 1205 
 1206                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
 1207                             inp->inp_lport != lport) {
 1208                                 continue;
 1209                         }
 1210 
 1211                         injail = prison_flag(inp->inp_cred, PR_IP6);
 1212                         if (injail) {
 1213                                 if (prison_check_ip6(inp->inp_cred,
 1214                                     laddr) != 0)
 1215                                         continue;
 1216                         } else {
 1217                                 if (local_exact != NULL)
 1218                                         continue;
 1219                         }
 1220 
 1221                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
 1222                                 if (injail)
 1223                                         return (inp);
 1224                                 else
 1225                                         local_exact = inp;
 1226                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
 1227                                 if (injail)
 1228                                         jail_wild = inp;
 1229                                 else
 1230                                         local_wild = inp;
 1231                         }
 1232                 } /* LIST_FOREACH */
 1233 
 1234                 if (jail_wild != NULL)
 1235                         return (jail_wild);
 1236                 if (local_exact != NULL)
 1237                         return (local_exact);
 1238                 if (local_wild != NULL)
 1239                         return (local_wild);
 1240         } /* if ((lookupflags & INPLOOKUP_WILDCARD) != 0) */
 1241 
 1242         /*
 1243          * Not found.
 1244          */
 1245         return (NULL);
 1246 }
 1247 
 1248 /*
 1249  * Lookup PCB in hash list, using pcbinfo tables.  This variation locks the
 1250  * hash list lock, and will return the inpcb locked (i.e., requires
 1251  * INPLOOKUP_LOCKPCB).
 1252  */
 1253 static struct inpcb *
 1254 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
 1255     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
 1256     struct ifnet *ifp)
 1257 {
 1258         struct inpcb *inp;
 1259 
 1260         INP_HASH_RLOCK(pcbinfo);
 1261         inp = in6_pcblookup_hash_locked(pcbinfo, faddr, fport, laddr, lport,
 1262             (lookupflags & ~(INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)), ifp);
 1263         if (inp != NULL) {
 1264                 if (lookupflags & INPLOOKUP_WLOCKPCB) {
 1265                         INP_WLOCK(inp);
 1266                         if (__predict_false(inp->inp_flags2 & INP_FREED)) {
 1267                                 INP_WUNLOCK(inp);
 1268                                 inp = NULL;
 1269                         }
 1270                 } else if (lookupflags & INPLOOKUP_RLOCKPCB) {
 1271                         INP_RLOCK(inp);
 1272                         if (__predict_false(inp->inp_flags2 & INP_FREED)) {
 1273                                 INP_RUNLOCK(inp);
 1274                                 inp = NULL;
 1275                         }
 1276                 } else
 1277                         panic("%s: locking bug", __func__);
 1278 #ifdef INVARIANTS
 1279                 if (inp != NULL) {
 1280                         if (lookupflags & INPLOOKUP_WLOCKPCB)
 1281                                 INP_WLOCK_ASSERT(inp);
 1282                         else
 1283                                 INP_RLOCK_ASSERT(inp);
 1284                 }
 1285 #endif
 1286         }
 1287         INP_HASH_RUNLOCK(pcbinfo);
 1288         return (inp);
 1289 }
 1290 
 1291 /*
 1292  * Public inpcb lookup routines, accepting a 4-tuple, and optionally, an mbuf
 1293  * from which a pre-calculated hash value may be extracted.
 1294  *
 1295  * Possibly more of this logic should be in in6_pcbgroup.c.
 1296  */
 1297 struct inpcb *
 1298 in6_pcblookup(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport,
 1299     struct in6_addr *laddr, u_int lport, int lookupflags, struct ifnet *ifp)
 1300 {
 1301 #if defined(PCBGROUP) && !defined(RSS)
 1302         struct inpcbgroup *pcbgroup;
 1303 #endif
 1304 
 1305         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
 1306             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1307         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
 1308             ("%s: LOCKPCB not set", __func__));
 1309 
 1310         /*
 1311          * When not using RSS, use connection groups in preference to the
 1312          * reservation table when looking up 4-tuples.  When using RSS, just
 1313          * use the reservation table, due to the cost of the Toeplitz hash
 1314          * in software.
 1315          *
 1316          * XXXRW: This policy belongs in the pcbgroup code, as in principle
 1317          * we could be doing RSS with a non-Toeplitz hash that is affordable
 1318          * in software.
 1319          */
 1320 #if defined(PCBGROUP) && !defined(RSS)
 1321         if (in_pcbgroup_enabled(pcbinfo)) {
 1322                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
 1323                     fport);
 1324                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
 1325                     laddr, lport, lookupflags, ifp));
 1326         }
 1327 #endif
 1328         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
 1329             lookupflags, ifp));
 1330 }
 1331 
 1332 struct inpcb *
 1333 in6_pcblookup_mbuf(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
 1334     u_int fport, struct in6_addr *laddr, u_int lport, int lookupflags,
 1335     struct ifnet *ifp, struct mbuf *m)
 1336 {
 1337 #ifdef PCBGROUP
 1338         struct inpcbgroup *pcbgroup;
 1339 #endif
 1340 
 1341         KASSERT((lookupflags & ~INPLOOKUP_MASK) == 0,
 1342             ("%s: invalid lookup flags %d", __func__, lookupflags));
 1343         KASSERT((lookupflags & (INPLOOKUP_RLOCKPCB | INPLOOKUP_WLOCKPCB)) != 0,
 1344             ("%s: LOCKPCB not set", __func__));
 1345 
 1346 #ifdef PCBGROUP
 1347         /*
 1348          * If we can use a hardware-generated hash to look up the connection
 1349          * group, use that connection group to find the inpcb.  Otherwise
 1350          * fall back on a software hash -- or the reservation table if we're
 1351          * using RSS.
 1352          *
 1353          * XXXRW: As above, that policy belongs in the pcbgroup code.
 1354          */
 1355         if (in_pcbgroup_enabled(pcbinfo) &&
 1356             M_HASHTYPE_TEST(m, M_HASHTYPE_NONE) == 0) {
 1357                 pcbgroup = in6_pcbgroup_byhash(pcbinfo, M_HASHTYPE_GET(m),
 1358                     m->m_pkthdr.flowid);
 1359                 if (pcbgroup != NULL)
 1360                         return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr,
 1361                             fport, laddr, lport, lookupflags, ifp));
 1362 #ifndef RSS
 1363                 pcbgroup = in6_pcbgroup_bytuple(pcbinfo, laddr, lport, faddr,
 1364                     fport);
 1365                 return (in6_pcblookup_group(pcbinfo, pcbgroup, faddr, fport,
 1366                     laddr, lport, lookupflags, ifp));
 1367 #endif
 1368         }
 1369 #endif
 1370         return (in6_pcblookup_hash(pcbinfo, faddr, fport, laddr, lport,
 1371             lookupflags, ifp));
 1372 }
 1373 
 1374 void
 1375 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m, int srcordst)
 1376 {
 1377         struct ip6_hdr *ip;
 1378 
 1379         ip = mtod(m, struct ip6_hdr *);
 1380         bzero(sin6, sizeof(*sin6));
 1381         sin6->sin6_len = sizeof(*sin6);
 1382         sin6->sin6_family = AF_INET6;
 1383         sin6->sin6_addr = srcordst ? ip->ip6_dst : ip->ip6_src;
 1384 
 1385         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
 1386 
 1387         return;
 1388 }

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