The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. Neither the name of the project nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $
   30  */
   31 
   32 /*-
   33  * Copyright (c) 1982, 1986, 1991, 1993
   34  *      The Regents of the University of California.  All rights reserved.
   35  *
   36  * Redistribution and use in source and binary forms, with or without
   37  * modification, are permitted provided that the following conditions
   38  * are met:
   39  * 1. Redistributions of source code must retain the above copyright
   40  *    notice, this list of conditions and the following disclaimer.
   41  * 2. Redistributions in binary form must reproduce the above copyright
   42  *    notice, this list of conditions and the following disclaimer in the
   43  *    documentation and/or other materials provided with the distribution.
   44  * 4. Neither the name of the University nor the names of its contributors
   45  *    may be used to endorse or promote products derived from this software
   46  *    without specific prior written permission.
   47  *
   48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   58  * SUCH DAMAGE.
   59  *
   60  *      @(#)in_pcb.c    8.2 (Berkeley) 1/4/94
   61  */
   62 
   63 #include <sys/cdefs.h>
   64 __FBSDID("$FreeBSD: releng/8.3/sys/netinet6/in6_pcb.c 220489 2011-04-09 12:35:08Z bz $");
   65 
   66 #include "opt_inet.h"
   67 #include "opt_inet6.h"
   68 #include "opt_ipsec.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/systm.h>
   72 #include <sys/malloc.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/domain.h>
   75 #include <sys/protosw.h>
   76 #include <sys/socket.h>
   77 #include <sys/socketvar.h>
   78 #include <sys/sockio.h>
   79 #include <sys/errno.h>
   80 #include <sys/time.h>
   81 #include <sys/priv.h>
   82 #include <sys/proc.h>
   83 #include <sys/jail.h>
   84 
   85 #include <vm/uma.h>
   86 
   87 #include <net/if.h>
   88 #include <net/if_types.h>
   89 #include <net/route.h>
   90 
   91 #include <netinet/in.h>
   92 #include <netinet/in_var.h>
   93 #include <netinet/in_systm.h>
   94 #include <netinet/tcp_var.h>
   95 #include <netinet/ip6.h>
   96 #include <netinet/ip_var.h>
   97 
   98 #include <netinet6/ip6_var.h>
   99 #include <netinet6/nd6.h>
  100 #include <netinet/in_pcb.h>
  101 #include <netinet6/in6_pcb.h>
  102 #include <netinet6/scope6_var.h>
  103 
  104 #include <security/mac/mac_framework.h>
  105 
  106 struct  in6_addr zeroin6_addr;
  107 
  108 int
  109 in6_pcbbind(register struct inpcb *inp, struct sockaddr *nam,
  110     struct ucred *cred)
  111 {
  112         struct socket *so = inp->inp_socket;
  113         struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
  114         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
  115         u_short lport = 0;
  116         int error, wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
  117 
  118         INP_INFO_WLOCK_ASSERT(pcbinfo);
  119         INP_WLOCK_ASSERT(inp);
  120 
  121         if (TAILQ_EMPTY(&V_in6_ifaddrhead))     /* XXX broken! */
  122                 return (EADDRNOTAVAIL);
  123         if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
  124                 return (EINVAL);
  125         if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
  126                 wild = INPLOOKUP_WILDCARD;
  127         if (nam == NULL) {
  128                 if ((error = prison_local_ip6(cred, &inp->in6p_laddr,
  129                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
  130                         return (error);
  131         } else {
  132                 sin6 = (struct sockaddr_in6 *)nam;
  133                 if (nam->sa_len != sizeof(*sin6))
  134                         return (EINVAL);
  135                 /*
  136                  * family check.
  137                  */
  138                 if (nam->sa_family != AF_INET6)
  139                         return (EAFNOSUPPORT);
  140 
  141                 if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
  142                         return(error);
  143 
  144                 if ((error = prison_local_ip6(cred, &sin6->sin6_addr,
  145                     ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
  146                         return (error);
  147 
  148                 lport = sin6->sin6_port;
  149                 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
  150                         /*
  151                          * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
  152                          * allow compepte duplication of binding if
  153                          * SO_REUSEPORT is set, or if SO_REUSEADDR is set
  154                          * and a multicast address is bound on both
  155                          * new and duplicated sockets.
  156                          */
  157                         if (so->so_options & SO_REUSEADDR)
  158                                 reuseport = SO_REUSEADDR|SO_REUSEPORT;
  159                 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  160                         struct ifaddr *ifa;
  161 
  162                         sin6->sin6_port = 0;            /* yech... */
  163                         if ((ifa = ifa_ifwithaddr((struct sockaddr *)sin6)) ==
  164                             NULL &&
  165                             (inp->inp_flags & INP_BINDANY) == 0) {
  166                                 return (EADDRNOTAVAIL);
  167                         }
  168 
  169                         /*
  170                          * XXX: bind to an anycast address might accidentally
  171                          * cause sending a packet with anycast source address.
  172                          * We should allow to bind to a deprecated address, since
  173                          * the application dares to use it.
  174                          */
  175                         if (ifa != NULL &&
  176                             ((struct in6_ifaddr *)ifa)->ia6_flags &
  177                             (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
  178                                 ifa_free(ifa);
  179                                 return (EADDRNOTAVAIL);
  180                         }
  181                         if (ifa != NULL)
  182                                 ifa_free(ifa);
  183                 }
  184                 if (lport) {
  185                         struct inpcb *t;
  186 
  187                         /* GROSS */
  188                         if (ntohs(lport) <= V_ipport_reservedhigh &&
  189                             ntohs(lport) >= V_ipport_reservedlow &&
  190                             priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT,
  191                             0))
  192                                 return (EACCES);
  193                         if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) &&
  194                             priv_check_cred(inp->inp_cred,
  195                             PRIV_NETINET_REUSEPORT, 0) != 0) {
  196                                 t = in6_pcblookup_local(pcbinfo,
  197                                     &sin6->sin6_addr, lport,
  198                                     INPLOOKUP_WILDCARD, cred);
  199                                 if (t &&
  200                                     ((t->inp_flags & INP_TIMEWAIT) == 0) &&
  201                                     (so->so_type != SOCK_STREAM ||
  202                                      IN6_IS_ADDR_UNSPECIFIED(&t->in6p_faddr)) &&
  203                                     (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
  204                                      !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
  205                                      (t->inp_socket->so_options & SO_REUSEPORT)
  206                                       == 0) && (inp->inp_cred->cr_uid !=
  207                                      t->inp_cred->cr_uid))
  208                                         return (EADDRINUSE);
  209                                 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
  210                                     IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  211                                         struct sockaddr_in sin;
  212 
  213                                         in6_sin6_2_sin(&sin, sin6);
  214                                         t = in_pcblookup_local(pcbinfo,
  215                                             sin.sin_addr, lport,
  216                                             INPLOOKUP_WILDCARD, cred);
  217                                         if (t &&
  218                                             ((t->inp_flags &
  219                                               INP_TIMEWAIT) == 0) &&
  220                                             (so->so_type != SOCK_STREAM ||
  221                                              ntohl(t->inp_faddr.s_addr) ==
  222                                               INADDR_ANY) &&
  223                                             (inp->inp_cred->cr_uid !=
  224                                              t->inp_cred->cr_uid))
  225                                                 return (EADDRINUSE);
  226                                 }
  227                         }
  228                         t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
  229                             lport, wild, cred);
  230                         if (t && (reuseport & ((t->inp_flags & INP_TIMEWAIT) ?
  231                             intotw(t)->tw_so_options :
  232                             t->inp_socket->so_options)) == 0)
  233                                 return (EADDRINUSE);
  234                         if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
  235                             IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
  236                                 struct sockaddr_in sin;
  237 
  238                                 in6_sin6_2_sin(&sin, sin6);
  239                                 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
  240                                     lport, wild, cred);
  241                                 if (t && t->inp_flags & INP_TIMEWAIT) {
  242                                         if ((reuseport &
  243                                             intotw(t)->tw_so_options) == 0 &&
  244                                             (ntohl(t->inp_laddr.s_addr) !=
  245                                              INADDR_ANY || ((inp->inp_vflag &
  246                                              INP_IPV6PROTO) ==
  247                                              (t->inp_vflag & INP_IPV6PROTO))))
  248                                                 return (EADDRINUSE);
  249                                 }
  250                                 else if (t &&
  251                                     (reuseport & t->inp_socket->so_options)
  252                                     == 0 && (ntohl(t->inp_laddr.s_addr) !=
  253                                     INADDR_ANY || INP_SOCKAF(so) ==
  254                                      INP_SOCKAF(t->inp_socket)))
  255                                         return (EADDRINUSE);
  256                         }
  257                 }
  258                 inp->in6p_laddr = sin6->sin6_addr;
  259         }
  260         if (lport == 0) {
  261                 if ((error = in6_pcbsetport(&inp->in6p_laddr, inp, cred)) != 0) {
  262                         /* Undo an address bind that may have occurred. */
  263                         inp->in6p_laddr = in6addr_any;
  264                         return (error);
  265                 }
  266         } else {
  267                 inp->inp_lport = lport;
  268                 if (in_pcbinshash(inp) != 0) {
  269                         inp->in6p_laddr = in6addr_any;
  270                         inp->inp_lport = 0;
  271                         return (EAGAIN);
  272                 }
  273         }
  274         return (0);
  275 }
  276 
  277 /*
  278  *   Transform old in6_pcbconnect() into an inner subroutine for new
  279  *   in6_pcbconnect(): Do some validity-checking on the remote
  280  *   address (in mbuf 'nam') and then determine local host address
  281  *   (i.e., which interface) to use to access that remote host.
  282  *
  283  *   This preserves definition of in6_pcbconnect(), while supporting a
  284  *   slightly different version for T/TCP.  (This is more than
  285  *   a bit of a kludge, but cleaning up the internal interfaces would
  286  *   have forced minor changes in every protocol).
  287  */
  288 int
  289 in6_pcbladdr(register struct inpcb *inp, struct sockaddr *nam,
  290     struct in6_addr *plocal_addr6)
  291 {
  292         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
  293         int error = 0;
  294         struct ifnet *ifp = NULL;
  295         int scope_ambiguous = 0;
  296         struct in6_addr in6a;
  297 
  298         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  299         INP_WLOCK_ASSERT(inp);
  300 
  301         if (nam->sa_len != sizeof (*sin6))
  302                 return (EINVAL);
  303         if (sin6->sin6_family != AF_INET6)
  304                 return (EAFNOSUPPORT);
  305         if (sin6->sin6_port == 0)
  306                 return (EADDRNOTAVAIL);
  307 
  308         if (sin6->sin6_scope_id == 0 && !V_ip6_use_defzone)
  309                 scope_ambiguous = 1;
  310         if ((error = sa6_embedscope(sin6, V_ip6_use_defzone)) != 0)
  311                 return(error);
  312 
  313         if (!TAILQ_EMPTY(&V_in6_ifaddrhead)) {
  314                 /*
  315                  * If the destination address is UNSPECIFIED addr,
  316                  * use the loopback addr, e.g ::1.
  317                  */
  318                 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
  319                         sin6->sin6_addr = in6addr_loopback;
  320         }
  321         if ((error = prison_remote_ip6(inp->inp_cred, &sin6->sin6_addr)) != 0)
  322                 return (error);
  323 
  324         error = in6_selectsrc(sin6, inp->in6p_outputopts,
  325             inp, NULL, inp->inp_cred, &ifp, &in6a);
  326         if (error)
  327                 return (error);
  328 
  329         if (ifp && scope_ambiguous &&
  330             (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) {
  331                 return(error);
  332         }
  333 
  334         /*
  335          * Do not update this earlier, in case we return with an error.
  336          *
  337          * XXX: this in6_selectsrc result might replace the bound local
  338          * address with the address specified by setsockopt(IPV6_PKTINFO).
  339          * Is it the intended behavior?
  340          */
  341         *plocal_addr6 = in6a;
  342 
  343         /*
  344          * Don't do pcblookup call here; return interface in
  345          * plocal_addr6
  346          * and exit to caller, that will do the lookup.
  347          */
  348 
  349         return (0);
  350 }
  351 
  352 /*
  353  * Outer subroutine:
  354  * Connect from a socket to a specified address.
  355  * Both address and port must be specified in argument sin.
  356  * If don't have a local address for this socket yet,
  357  * then pick one.
  358  */
  359 int
  360 in6_pcbconnect(register struct inpcb *inp, struct sockaddr *nam,
  361     struct ucred *cred)
  362 {
  363         register struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
  364         struct in6_addr addr6;
  365         int error;
  366 
  367         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  368         INP_WLOCK_ASSERT(inp);
  369 
  370         /*
  371          * Call inner routine, to assign local interface address.
  372          * in6_pcbladdr() may automatically fill in sin6_scope_id.
  373          */
  374         if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
  375                 return (error);
  376 
  377         if (in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr,
  378                                sin6->sin6_port,
  379                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
  380                               ? &addr6 : &inp->in6p_laddr,
  381                               inp->inp_lport, 0, NULL) != NULL) {
  382                 return (EADDRINUSE);
  383         }
  384         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  385                 if (inp->inp_lport == 0) {
  386                         error = in6_pcbbind(inp, (struct sockaddr *)0, cred);
  387                         if (error)
  388                                 return (error);
  389                 }
  390                 inp->in6p_laddr = addr6;
  391         }
  392         inp->in6p_faddr = sin6->sin6_addr;
  393         inp->inp_fport = sin6->sin6_port;
  394         /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
  395         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
  396         if (inp->inp_flags & IN6P_AUTOFLOWLABEL)
  397                 inp->inp_flow |=
  398                     (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK);
  399 
  400         in_pcbrehash(inp);
  401 
  402         return (0);
  403 }
  404 
  405 void
  406 in6_pcbdisconnect(struct inpcb *inp)
  407 {
  408 
  409         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
  410         INP_WLOCK_ASSERT(inp);
  411 
  412         bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
  413         inp->inp_fport = 0;
  414         /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
  415         inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
  416         in_pcbrehash(inp);
  417 }
  418 
  419 struct sockaddr *
  420 in6_sockaddr(in_port_t port, struct in6_addr *addr_p)
  421 {
  422         struct sockaddr_in6 *sin6;
  423 
  424         sin6 = malloc(sizeof *sin6, M_SONAME, M_WAITOK);
  425         bzero(sin6, sizeof *sin6);
  426         sin6->sin6_family = AF_INET6;
  427         sin6->sin6_len = sizeof(*sin6);
  428         sin6->sin6_port = port;
  429         sin6->sin6_addr = *addr_p;
  430         (void)sa6_recoverscope(sin6); /* XXX: should catch errors */
  431 
  432         return (struct sockaddr *)sin6;
  433 }
  434 
  435 struct sockaddr *
  436 in6_v4mapsin6_sockaddr(in_port_t port, struct in_addr *addr_p)
  437 {
  438         struct sockaddr_in sin;
  439         struct sockaddr_in6 *sin6_p;
  440 
  441         bzero(&sin, sizeof sin);
  442         sin.sin_family = AF_INET;
  443         sin.sin_len = sizeof(sin);
  444         sin.sin_port = port;
  445         sin.sin_addr = *addr_p;
  446 
  447         sin6_p = malloc(sizeof *sin6_p, M_SONAME,
  448                 M_WAITOK);
  449         in6_sin_2_v4mapsin6(&sin, sin6_p);
  450 
  451         return (struct sockaddr *)sin6_p;
  452 }
  453 
  454 int
  455 in6_getsockaddr(struct socket *so, struct sockaddr **nam)
  456 {
  457         register struct inpcb *inp;
  458         struct in6_addr addr;
  459         in_port_t port;
  460 
  461         inp = sotoinpcb(so);
  462         KASSERT(inp != NULL, ("in6_getsockaddr: inp == NULL"));
  463 
  464         INP_RLOCK(inp);
  465         port = inp->inp_lport;
  466         addr = inp->in6p_laddr;
  467         INP_RUNLOCK(inp);
  468 
  469         *nam = in6_sockaddr(port, &addr);
  470         return 0;
  471 }
  472 
  473 int
  474 in6_getpeeraddr(struct socket *so, struct sockaddr **nam)
  475 {
  476         struct inpcb *inp;
  477         struct in6_addr addr;
  478         in_port_t port;
  479 
  480         inp = sotoinpcb(so);
  481         KASSERT(inp != NULL, ("in6_getpeeraddr: inp == NULL"));
  482 
  483         INP_RLOCK(inp);
  484         port = inp->inp_fport;
  485         addr = inp->in6p_faddr;
  486         INP_RUNLOCK(inp);
  487 
  488         *nam = in6_sockaddr(port, &addr);
  489         return 0;
  490 }
  491 
  492 int
  493 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
  494 {
  495         struct  inpcb *inp;
  496         int     error;
  497 
  498         inp = sotoinpcb(so);
  499         KASSERT(inp != NULL, ("in6_mapped_sockaddr: inp == NULL"));
  500 
  501         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
  502                 error = in_getsockaddr(so, nam);
  503                 if (error == 0)
  504                         in6_sin_2_v4mapsin6_in_sock(nam);
  505         } else {
  506                 /* scope issues will be handled in in6_getsockaddr(). */
  507                 error = in6_getsockaddr(so, nam);
  508         }
  509 
  510         return error;
  511 }
  512 
  513 int
  514 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
  515 {
  516         struct  inpcb *inp;
  517         int     error;
  518 
  519         inp = sotoinpcb(so);
  520         KASSERT(inp != NULL, ("in6_mapped_peeraddr: inp == NULL"));
  521 
  522         if ((inp->inp_vflag & (INP_IPV4 | INP_IPV6)) == INP_IPV4) {
  523                 error = in_getpeeraddr(so, nam);
  524                 if (error == 0)
  525                         in6_sin_2_v4mapsin6_in_sock(nam);
  526         } else
  527         /* scope issues will be handled in in6_getpeeraddr(). */
  528         error = in6_getpeeraddr(so, nam);
  529 
  530         return error;
  531 }
  532 
  533 /*
  534  * Pass some notification to all connections of a protocol
  535  * associated with address dst.  The local address and/or port numbers
  536  * may be specified to limit the search.  The "usual action" will be
  537  * taken, depending on the ctlinput cmd.  The caller must filter any
  538  * cmds that are uninteresting (e.g., no error in the map).
  539  * Call the protocol specific routine (if any) to report
  540  * any errors for each matching socket.
  541  */
  542 void
  543 in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst,
  544     u_int fport_arg, const struct sockaddr *src, u_int lport_arg,
  545     int cmd, void *cmdarg,
  546     struct inpcb *(*notify)(struct inpcb *, int))
  547 {
  548         struct inpcb *inp, *inp_temp;
  549         struct sockaddr_in6 sa6_src, *sa6_dst;
  550         u_short fport = fport_arg, lport = lport_arg;
  551         u_int32_t flowinfo;
  552         int errno;
  553 
  554         if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
  555                 return;
  556 
  557         sa6_dst = (struct sockaddr_in6 *)dst;
  558         if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
  559                 return;
  560 
  561         /*
  562          * note that src can be NULL when we get notify by local fragmentation.
  563          */
  564         sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
  565         flowinfo = sa6_src.sin6_flowinfo;
  566 
  567         /*
  568          * Redirects go to all references to the destination,
  569          * and use in6_rtchange to invalidate the route cache.
  570          * Dead host indications: also use in6_rtchange to invalidate
  571          * the cache, and deliver the error to all the sockets.
  572          * Otherwise, if we have knowledge of the local port and address,
  573          * deliver only to that socket.
  574          */
  575         if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
  576                 fport = 0;
  577                 lport = 0;
  578                 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
  579 
  580                 if (cmd != PRC_HOSTDEAD)
  581                         notify = in6_rtchange;
  582         }
  583         errno = inet6ctlerrmap[cmd];
  584         INP_INFO_WLOCK(pcbinfo);
  585         LIST_FOREACH_SAFE(inp, pcbinfo->ipi_listhead, inp_list, inp_temp) {
  586                 INP_WLOCK(inp);
  587                 if ((inp->inp_vflag & INP_IPV6) == 0) {
  588                         INP_WUNLOCK(inp);
  589                         continue;
  590                 }
  591 
  592                 /*
  593                  * If the error designates a new path MTU for a destination
  594                  * and the application (associated with this socket) wanted to
  595                  * know the value, notify. Note that we notify for all
  596                  * disconnected sockets if the corresponding application
  597                  * wanted. This is because some UDP applications keep sending
  598                  * sockets disconnected.
  599                  * XXX: should we avoid to notify the value to TCP sockets?
  600                  */
  601                 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
  602                     (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
  603                      IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
  604                         ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst,
  605                                         (u_int32_t *)cmdarg);
  606                 }
  607 
  608                 /*
  609                  * Detect if we should notify the error. If no source and
  610                  * destination ports are specifed, but non-zero flowinfo and
  611                  * local address match, notify the error. This is the case
  612                  * when the error is delivered with an encrypted buffer
  613                  * by ESP. Otherwise, just compare addresses and ports
  614                  * as usual.
  615                  */
  616                 if (lport == 0 && fport == 0 && flowinfo &&
  617                     inp->inp_socket != NULL &&
  618                     flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) &&
  619                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
  620                         goto do_notify;
  621                 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
  622                                              &sa6_dst->sin6_addr) ||
  623                          inp->inp_socket == 0 ||
  624                          (lport && inp->inp_lport != lport) ||
  625                          (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
  626                           !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
  627                                               &sa6_src.sin6_addr)) ||
  628                          (fport && inp->inp_fport != fport)) {
  629                         INP_WUNLOCK(inp);
  630                         continue;
  631                 }
  632 
  633           do_notify:
  634                 if (notify) {
  635                         if ((*notify)(inp, errno))
  636                                 INP_WUNLOCK(inp);
  637                 } else
  638                         INP_WUNLOCK(inp);
  639         }
  640         INP_INFO_WUNLOCK(pcbinfo);
  641 }
  642 
  643 /*
  644  * Lookup a PCB based on the local address and port.
  645  */
  646 struct inpcb *
  647 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
  648     u_short lport, int wild_okay, struct ucred *cred)
  649 {
  650         register struct inpcb *inp;
  651         int matchwild = 3, wildcard;
  652 
  653         INP_INFO_WLOCK_ASSERT(pcbinfo);
  654 
  655         if (!wild_okay) {
  656                 struct inpcbhead *head;
  657                 /*
  658                  * Look for an unconnected (wildcard foreign addr) PCB that
  659                  * matches the local address and port we're looking for.
  660                  */
  661                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
  662                     0, pcbinfo->ipi_hashmask)];
  663                 LIST_FOREACH(inp, head, inp_hash) {
  664                         /* XXX inp locking */
  665                         if ((inp->inp_vflag & INP_IPV6) == 0)
  666                                 continue;
  667                         if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
  668                             IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
  669                             inp->inp_lport == lport) {
  670                                 /* Found. */
  671                                 if (cred == NULL ||
  672                                     prison_equal_ip6(cred->cr_prison,
  673                                         inp->inp_cred->cr_prison))
  674                                         return (inp);
  675                         }
  676                 }
  677                 /*
  678                  * Not found.
  679                  */
  680                 return (NULL);
  681         } else {
  682                 struct inpcbporthead *porthash;
  683                 struct inpcbport *phd;
  684                 struct inpcb *match = NULL;
  685                 /*
  686                  * Best fit PCB lookup.
  687                  *
  688                  * First see if this local port is in use by looking on the
  689                  * port hash list.
  690                  */
  691                 porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport,
  692                     pcbinfo->ipi_porthashmask)];
  693                 LIST_FOREACH(phd, porthash, phd_hash) {
  694                         if (phd->phd_port == lport)
  695                                 break;
  696                 }
  697                 if (phd != NULL) {
  698                         /*
  699                          * Port is in use by one or more PCBs. Look for best
  700                          * fit.
  701                          */
  702                         LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
  703                                 wildcard = 0;
  704                                 if (cred != NULL &&
  705                                     !prison_equal_ip6(cred->cr_prison,
  706                                         inp->inp_cred->cr_prison))
  707                                         continue;
  708                                 /* XXX inp locking */
  709                                 if ((inp->inp_vflag & INP_IPV6) == 0)
  710                                         continue;
  711                                 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
  712                                         wildcard++;
  713                                 if (!IN6_IS_ADDR_UNSPECIFIED(
  714                                         &inp->in6p_laddr)) {
  715                                         if (IN6_IS_ADDR_UNSPECIFIED(laddr))
  716                                                 wildcard++;
  717                                         else if (!IN6_ARE_ADDR_EQUAL(
  718                                             &inp->in6p_laddr, laddr))
  719                                                 continue;
  720                                 } else {
  721                                         if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
  722                                                 wildcard++;
  723                                 }
  724                                 if (wildcard < matchwild) {
  725                                         match = inp;
  726                                         matchwild = wildcard;
  727                                         if (matchwild == 0)
  728                                                 break;
  729                                 }
  730                         }
  731                 }
  732                 return (match);
  733         }
  734 }
  735 
  736 void
  737 in6_pcbpurgeif0(struct inpcbinfo *pcbinfo, struct ifnet *ifp)
  738 {
  739         struct inpcb *in6p;
  740         struct ip6_moptions *im6o;
  741         int i, gap;
  742 
  743         INP_INFO_RLOCK(pcbinfo);
  744         LIST_FOREACH(in6p, pcbinfo->ipi_listhead, inp_list) {
  745                 INP_WLOCK(in6p);
  746                 im6o = in6p->in6p_moptions;
  747                 if ((in6p->inp_vflag & INP_IPV6) && im6o != NULL) {
  748                         /*
  749                          * Unselect the outgoing ifp for multicast if it
  750                          * is being detached.
  751                          */
  752                         if (im6o->im6o_multicast_ifp == ifp)
  753                                 im6o->im6o_multicast_ifp = NULL;
  754                         /*
  755                          * Drop multicast group membership if we joined
  756                          * through the interface being detached.
  757                          */
  758                         gap = 0;
  759                         for (i = 0; i < im6o->im6o_num_memberships; i++) {
  760                                 if (im6o->im6o_membership[i]->in6m_ifp ==
  761                                     ifp) {
  762                                         in6_mc_leave(im6o->im6o_membership[i],
  763                                             NULL);
  764                                         gap++;
  765                                 } else if (gap != 0) {
  766                                         im6o->im6o_membership[i - gap] =
  767                                             im6o->im6o_membership[i];
  768                                 }
  769                         }
  770                         im6o->im6o_num_memberships -= gap;
  771                 }
  772                 INP_WUNLOCK(in6p);
  773         }
  774         INP_INFO_RUNLOCK(pcbinfo);
  775 }
  776 
  777 /*
  778  * Check for alternatives when higher level complains
  779  * about service problems.  For now, invalidate cached
  780  * routing information.  If the route was created dynamically
  781  * (by a redirect), time to try a default gateway again.
  782  */
  783 void
  784 in6_losing(struct inpcb *in6p)
  785 {
  786 
  787         /*
  788          * We don't store route pointers in the routing table anymore
  789          */
  790         return;
  791 }
  792 
  793 /*
  794  * After a routing change, flush old routing
  795  * and allocate a (hopefully) better one.
  796  */
  797 struct inpcb *
  798 in6_rtchange(struct inpcb *inp, int errno)
  799 {
  800         /*
  801          * We don't store route pointers in the routing table anymore
  802          */
  803         return inp;
  804 }
  805 
  806 /*
  807  * Lookup PCB in hash list.
  808  */
  809 struct inpcb *
  810 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
  811     u_int fport_arg, struct in6_addr *laddr, u_int lport_arg, int wildcard,
  812     struct ifnet *ifp)
  813 {
  814         struct inpcbhead *head;
  815         struct inpcb *inp, *tmpinp;
  816         u_short fport = fport_arg, lport = lport_arg;
  817         int faith;
  818 
  819         INP_INFO_LOCK_ASSERT(pcbinfo);
  820 
  821         if (faithprefix_p != NULL)
  822                 faith = (*faithprefix_p)(laddr);
  823         else
  824                 faith = 0;
  825 
  826         /*
  827          * First look for an exact match.
  828          */
  829         tmpinp = NULL;
  830         head = &pcbinfo->ipi_hashbase[
  831             INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport,
  832             pcbinfo->ipi_hashmask)];
  833         LIST_FOREACH(inp, head, inp_hash) {
  834                 /* XXX inp locking */
  835                 if ((inp->inp_vflag & INP_IPV6) == 0)
  836                         continue;
  837                 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
  838                     IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
  839                     inp->inp_fport == fport &&
  840                     inp->inp_lport == lport) {
  841                         /*
  842                          * XXX We should be able to directly return
  843                          * the inp here, without any checks.
  844                          * Well unless both bound with SO_REUSEPORT?
  845                          */
  846                         if (prison_flag(inp->inp_cred, PR_IP6))
  847                                 return (inp);
  848                         if (tmpinp == NULL)
  849                                 tmpinp = inp;
  850                 }
  851         }
  852         if (tmpinp != NULL)
  853                 return (tmpinp);
  854 
  855         /*
  856          * Then look for a wildcard match, if requested.
  857          */
  858         if (wildcard == INPLOOKUP_WILDCARD) {
  859                 struct inpcb *local_wild = NULL, *local_exact = NULL;
  860                 struct inpcb *jail_wild = NULL;
  861                 int injail;
  862 
  863                 /*
  864                  * Order of socket selection - we always prefer jails.
  865                  *      1. jailed, non-wild.
  866                  *      2. jailed, wild.
  867                  *      3. non-jailed, non-wild.
  868                  *      4. non-jailed, wild.
  869                  */
  870                 head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport,
  871                     0, pcbinfo->ipi_hashmask)];
  872                 LIST_FOREACH(inp, head, inp_hash) {
  873                         /* XXX inp locking */
  874                         if ((inp->inp_vflag & INP_IPV6) == 0)
  875                                 continue;
  876 
  877                         if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
  878                             inp->inp_lport != lport) {
  879                                 continue;
  880                         }
  881 
  882                         /* XXX inp locking */
  883                         if (faith && (inp->inp_flags & INP_FAITH) == 0)
  884                                 continue;
  885 
  886                         injail = prison_flag(inp->inp_cred, PR_IP6);
  887                         if (injail) {
  888                                 if (prison_check_ip6(inp->inp_cred,
  889                                     laddr) != 0)
  890                                         continue;
  891                         } else {
  892                                 if (local_exact != NULL)
  893                                         continue;
  894                         }
  895 
  896                         if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr)) {
  897                                 if (injail)
  898                                         return (inp);
  899                                 else
  900                                         local_exact = inp;
  901                         } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
  902                                 if (injail)
  903                                         jail_wild = inp;
  904                                 else
  905                                         local_wild = inp;
  906                         }
  907                 } /* LIST_FOREACH */
  908 
  909                 if (jail_wild != NULL)
  910                         return (jail_wild);
  911                 if (local_exact != NULL)
  912                         return (local_exact);
  913                 if (local_wild != NULL)
  914                         return (local_wild);
  915         } /* if (wildcard == INPLOOKUP_WILDCARD) */
  916 
  917         /*
  918          * Not found.
  919          */
  920         return (NULL);
  921 }
  922 
  923 void
  924 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
  925 {
  926         struct ip6_hdr *ip;
  927 
  928         ip = mtod(m, struct ip6_hdr *);
  929         bzero(sin6, sizeof(*sin6));
  930         sin6->sin6_len = sizeof(*sin6);
  931         sin6->sin6_family = AF_INET6;
  932         sin6->sin6_addr = ip->ip6_src;
  933 
  934         (void)sa6_recoverscope(sin6); /* XXX: should catch errors... */
  935 
  936         return;
  937 }

Cache object: 9e93dbde2c2dc34cd35075d46e1d2fd9


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