in.c

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    1 /*
    2  * Copyright (c) 1982, 1986, 1991, 1993
    3  *      The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)in.c        8.4 (Berkeley) 1/9/95
   34  * $FreeBSD$
   35  */
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/sockio.h>
   40 #include <sys/malloc.h>
   41 #include <sys/proc.h>
   42 #include <sys/socket.h>
   43 #include <sys/kernel.h>
   44 #include <sys/sysctl.h>
   45 
   46 #include <net/if.h>
   47 #include <net/route.h>
   48 
   49 #include <netinet/in.h>
   50 #include <netinet/in_var.h>
   51 
   52 #include <netinet/igmp_var.h>
   53 
   54 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
   55 
   56 static void     in_socktrim __P((struct sockaddr_in *));
   57 static int      in_ifinit __P((struct ifnet *,
   58             struct in_ifaddr *, struct sockaddr_in *, int));
   59 
   60 static int subnetsarelocal = 0;
   61 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW, 
   62         &subnetsarelocal, 0, "");
   63 
   64 struct in_multihead in_multihead; /* XXX BSS initialization */
   65 
   66 /*
   67  * Return 1 if an internet address is for a ``local'' host
   68  * (one to which we have a connection).  If subnetsarelocal
   69  * is true, this includes other subnets of the local net.
   70  * Otherwise, it includes only the directly-connected (sub)nets.
   71  */
   72 int
   73 in_localaddr(in)
   74         struct in_addr in;
   75 {
   76         register u_long i = ntohl(in.s_addr);
   77         register struct in_ifaddr *ia;
   78 
   79         if (subnetsarelocal) {
   80                 for (ia = in_ifaddrhead.tqh_first; ia; 
   81                      ia = ia->ia_link.tqe_next)
   82                         if ((i & ia->ia_netmask) == ia->ia_net)
   83                                 return (1);
   84         } else {
   85                 for (ia = in_ifaddrhead.tqh_first; ia;
   86                      ia = ia->ia_link.tqe_next)
   87                         if ((i & ia->ia_subnetmask) == ia->ia_subnet)
   88                                 return (1);
   89         }
   90         return (0);
   91 }
   92 
   93 /*
   94  * Determine whether an IP address is in a reserved set of addresses
   95  * that may not be forwarded, or whether datagrams to that destination
   96  * may be forwarded.
   97  */
   98 int
   99 in_canforward(in)
  100         struct in_addr in;
  101 {
  102         register u_long i = ntohl(in.s_addr);
  103         register u_long net;
  104 
  105         if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
  106                 return (0);
  107         if (IN_CLASSA(i)) {
  108                 net = i & IN_CLASSA_NET;
  109                 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
  110                         return (0);
  111         }
  112         return (1);
  113 }
  114 
  115 /*
  116  * Trim a mask in a sockaddr
  117  */
  118 static void
  119 in_socktrim(ap)
  120 struct sockaddr_in *ap;
  121 {
  122     register char *cplim = (char *) &ap->sin_addr;
  123     register char *cp = (char *) (&ap->sin_addr + 1);
  124 
  125     ap->sin_len = 0;
  126     while (--cp >= cplim)
  127         if (*cp) {
  128             (ap)->sin_len = cp - (char *) (ap) + 1;
  129             break;
  130         }
  131 }
  132 
  133 static int in_interfaces;       /* number of external internet interfaces */
  134 
  135 /*
  136  * Generic internet control operations (ioctl's).
  137  * Ifp is 0 if not an interface-specific ioctl.
  138  */
  139 /* ARGSUSED */
  140 int
  141 in_control(so, cmd, data, ifp, p)
  142         struct socket *so;
  143         u_long cmd;
  144         caddr_t data;
  145         register struct ifnet *ifp;
  146         struct proc *p;
  147 {
  148         register struct ifreq *ifr = (struct ifreq *)data;
  149         register struct in_ifaddr *ia = 0, *iap;
  150         register struct ifaddr *ifa;
  151         struct in_ifaddr *oia;
  152         struct in_aliasreq *ifra = (struct in_aliasreq *)data;
  153         struct sockaddr_in oldaddr;
  154         int error, hostIsNew, maskIsNew, s;
  155         u_long i;
  156 
  157         /*
  158          * Find address for this interface, if it exists.
  159          *
  160          * If an alias address was specified, find that one instead of
  161          * the first one on the interface.
  162          */
  163         if (ifp)
  164                 for (iap = in_ifaddrhead.tqh_first; iap; 
  165                      iap = iap->ia_link.tqe_next)
  166                         if (iap->ia_ifp == ifp) {
  167                                 if (((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr.s_addr ==
  168                                     iap->ia_addr.sin_addr.s_addr) {
  169                                         ia = iap;
  170                                         break;
  171                                 } else if (ia == NULL) {
  172                                         ia = iap;
  173                                         if (ifr->ifr_addr.sa_family != AF_INET)
  174                                                 break;
  175                                 }
  176                         }
  177 
  178         switch (cmd) {
  179 
  180         case SIOCAIFADDR:
  181         case SIOCDIFADDR:
  182                 if (ifp == 0)
  183                         return (EADDRNOTAVAIL);
  184                 if (ifra->ifra_addr.sin_family == AF_INET) {
  185                         for (oia = ia; ia; ia = ia->ia_link.tqe_next) {
  186                                 if (ia->ia_ifp == ifp  &&
  187                                     ia->ia_addr.sin_addr.s_addr ==
  188                                     ifra->ifra_addr.sin_addr.s_addr)
  189                                         break;
  190                         }
  191                         if ((ifp->if_flags & IFF_POINTOPOINT)
  192                             && (cmd == SIOCAIFADDR)
  193                             && (ifra->ifra_dstaddr.sin_addr.s_addr
  194                                 == INADDR_ANY)) {
  195                                 return EDESTADDRREQ;
  196                         }
  197                 }
  198                 if (cmd == SIOCDIFADDR && ia == 0)
  199                         return (EADDRNOTAVAIL);
  200                 /* FALLTHROUGH */
  201         case SIOCSIFADDR:
  202         case SIOCSIFNETMASK:
  203         case SIOCSIFDSTADDR:
  204                 if (p && (error = suser(p->p_ucred, &p->p_acflag)) != 0)
  205                         return error;
  206 
  207                 if (ifp == 0)
  208                         return (EADDRNOTAVAIL);
  209                 if (ia == (struct in_ifaddr *)0) {
  210                         ia = (struct in_ifaddr *)
  211                                 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
  212                         if (ia == (struct in_ifaddr *)NULL)
  213                                 return (ENOBUFS);
  214                         bzero((caddr_t)ia, sizeof *ia);
  215                         /*
  216                          * Protect from ipintr() traversing address list
  217                          * while we're modifying it.
  218                          */
  219                         s = splnet();
  220                         
  221                         TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
  222                         ifa = &ia->ia_ifa;
  223                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
  224 
  225                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
  226                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
  227                         ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
  228                         ia->ia_sockmask.sin_len = 8;
  229                         if (ifp->if_flags & IFF_BROADCAST) {
  230                                 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
  231                                 ia->ia_broadaddr.sin_family = AF_INET;
  232                         }
  233                         ia->ia_ifp = ifp;
  234                         if (!(ifp->if_flags & IFF_LOOPBACK))
  235                                 in_interfaces++;
  236                         splx(s);
  237                 }
  238                 break;
  239 
  240         case SIOCSIFBRDADDR:
  241                 if (p && (error = suser(p->p_ucred, &p->p_acflag)) != 0)
  242                         return error;
  243                 /* FALLTHROUGH */
  244 
  245         case SIOCGIFADDR:
  246         case SIOCGIFNETMASK:
  247         case SIOCGIFDSTADDR:
  248         case SIOCGIFBRDADDR:
  249                 if (ia == (struct in_ifaddr *)0)
  250                         return (EADDRNOTAVAIL);
  251                 break;
  252         }
  253         switch (cmd) {
  254 
  255         case SIOCGIFADDR:
  256                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
  257                 break;
  258 
  259         case SIOCGIFBRDADDR:
  260                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
  261                         return (EINVAL);
  262                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
  263                 break;
  264 
  265         case SIOCGIFDSTADDR:
  266                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
  267                         return (EINVAL);
  268                 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
  269                 break;
  270 
  271         case SIOCGIFNETMASK:
  272                 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
  273                 break;
  274 
  275         case SIOCSIFDSTADDR:
  276                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
  277                         return (EINVAL);
  278                 oldaddr = ia->ia_dstaddr;
  279                 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
  280                 if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
  281                                         (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
  282                         ia->ia_dstaddr = oldaddr;
  283                         return (error);
  284                 }
  285                 if (ia->ia_flags & IFA_ROUTE) {
  286                         ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
  287                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
  288                         ia->ia_ifa.ifa_dstaddr =
  289                                         (struct sockaddr *)&ia->ia_dstaddr;
  290                         rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
  291                 }
  292                 break;
  293 
  294         case SIOCSIFBRDADDR:
  295                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
  296                         return (EINVAL);
  297                 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
  298                 break;
  299 
  300         case SIOCSIFADDR:
  301                 return (in_ifinit(ifp, ia,
  302                     (struct sockaddr_in *) &ifr->ifr_addr, 1));
  303 
  304         case SIOCSIFNETMASK:
  305                 i = ifra->ifra_addr.sin_addr.s_addr;
  306                 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr = i);
  307                 break;
  308 
  309         case SIOCAIFADDR:
  310                 maskIsNew = 0;
  311                 hostIsNew = 1;
  312                 error = 0;
  313                 if (ia->ia_addr.sin_family == AF_INET) {
  314                         if (ifra->ifra_addr.sin_len == 0) {
  315                                 ifra->ifra_addr = ia->ia_addr;
  316                                 hostIsNew = 0;
  317                         } else if (ifra->ifra_addr.sin_addr.s_addr ==
  318                                                ia->ia_addr.sin_addr.s_addr)
  319                                 hostIsNew = 0;
  320                 }
  321                 if (ifra->ifra_mask.sin_len) {
  322                         in_ifscrub(ifp, ia);
  323                         ia->ia_sockmask = ifra->ifra_mask;
  324                         ia->ia_subnetmask =
  325                              ntohl(ia->ia_sockmask.sin_addr.s_addr);
  326                         maskIsNew = 1;
  327                 }
  328                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
  329                     (ifra->ifra_dstaddr.sin_family == AF_INET)) {
  330                         in_ifscrub(ifp, ia);
  331                         ia->ia_dstaddr = ifra->ifra_dstaddr;
  332                         maskIsNew  = 1; /* We lie; but the effect's the same */
  333                 }
  334                 if (ifra->ifra_addr.sin_family == AF_INET &&
  335                     (hostIsNew || maskIsNew))
  336                         error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
  337                 if ((ifp->if_flags & IFF_BROADCAST) &&
  338                     (ifra->ifra_broadaddr.sin_family == AF_INET))
  339                         ia->ia_broadaddr = ifra->ifra_broadaddr;
  340                 return (error);
  341 
  342         case SIOCDIFADDR:
  343                 in_ifscrub(ifp, ia);
  344                 /*
  345                  * Protect from ipintr() traversing address list
  346                  * while we're modifying it.
  347                  */
  348                 s = splnet();
  349 
  350                 ifa = &ia->ia_ifa;
  351                 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
  352                 oia = ia;
  353                 TAILQ_REMOVE(&in_ifaddrhead, oia, ia_link);
  354                 IFAFREE(&oia->ia_ifa);
  355                 splx(s);
  356                 break;
  357 
  358         default:
  359                 if (ifp == 0 || ifp->if_ioctl == 0)
  360                         return (EOPNOTSUPP);
  361                 return ((*ifp->if_ioctl)(ifp, cmd, data));
  362         }
  363         return (0);
  364 }
  365 
  366 /*
  367  * Delete any existing route for an interface.
  368  */
  369 void
  370 in_ifscrub(ifp, ia)
  371         register struct ifnet *ifp;
  372         register struct in_ifaddr *ia;
  373 {
  374 
  375         if ((ia->ia_flags & IFA_ROUTE) == 0)
  376                 return;
  377         if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
  378                 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
  379         else
  380                 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
  381         ia->ia_flags &= ~IFA_ROUTE;
  382 }
  383 
  384 /*
  385  * Initialize an interface's internet address
  386  * and routing table entry.
  387  */
  388 static int
  389 in_ifinit(ifp, ia, sin, scrub)
  390         register struct ifnet *ifp;
  391         register struct in_ifaddr *ia;
  392         struct sockaddr_in *sin;
  393         int scrub;
  394 {
  395         register u_long i = ntohl(sin->sin_addr.s_addr);
  396         struct sockaddr_in oldaddr;
  397         int s = splimp(), flags = RTF_UP, error;
  398 
  399         oldaddr = ia->ia_addr;
  400         ia->ia_addr = *sin;
  401         /*
  402          * Give the interface a chance to initialize
  403          * if this is its first address,
  404          * and to validate the address if necessary.
  405          */
  406         if (ifp->if_ioctl &&
  407             (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
  408                 splx(s);
  409                 ia->ia_addr = oldaddr;
  410                 return (error);
  411         }
  412         splx(s);
  413         if (scrub) {
  414                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
  415                 in_ifscrub(ifp, ia);
  416                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
  417         }
  418         if (IN_CLASSA(i))
  419                 ia->ia_netmask = IN_CLASSA_NET;
  420         else if (IN_CLASSB(i))
  421                 ia->ia_netmask = IN_CLASSB_NET;
  422         else
  423                 ia->ia_netmask = IN_CLASSC_NET;
  424         /*
  425          * The subnet mask usually includes at least the standard network part,
  426          * but may may be smaller in the case of supernetting.
  427          * If it is set, we believe it.
  428          */
  429         if (ia->ia_subnetmask == 0) {
  430                 ia->ia_subnetmask = ia->ia_netmask;
  431                 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
  432         } else
  433                 ia->ia_netmask &= ia->ia_subnetmask;
  434         ia->ia_net = i & ia->ia_netmask;
  435         ia->ia_subnet = i & ia->ia_subnetmask;
  436         in_socktrim(&ia->ia_sockmask);
  437         /*
  438          * Add route for the network.
  439          */
  440         ia->ia_ifa.ifa_metric = ifp->if_metric;
  441         if (ifp->if_flags & IFF_BROADCAST) {
  442                 ia->ia_broadaddr.sin_addr.s_addr =
  443                         htonl(ia->ia_subnet | ~ia->ia_subnetmask);
  444                 ia->ia_netbroadcast.s_addr =
  445                         htonl(ia->ia_net | ~ ia->ia_netmask);
  446         } else if (ifp->if_flags & IFF_LOOPBACK) {
  447                 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
  448                 flags |= RTF_HOST;
  449         } else if (ifp->if_flags & IFF_POINTOPOINT) {
  450                 if (ia->ia_dstaddr.sin_family != AF_INET)
  451                         return (0);
  452                 flags |= RTF_HOST;
  453         }
  454         if ((error = rtinit(&(ia->ia_ifa), (int)RTM_ADD, flags)) == 0)
  455                 ia->ia_flags |= IFA_ROUTE;
  456 
  457         /*
  458          * If the interface supports multicast, join the "all hosts"
  459          * multicast group on that interface.
  460          */
  461         if (ifp->if_flags & IFF_MULTICAST) {
  462                 struct in_addr addr;
  463 
  464                 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
  465                 in_addmulti(&addr, ifp);
  466         }
  467         return (error);
  468 }
  469 
  470 
  471 /*
  472  * Return 1 if the address might be a local broadcast address.
  473  */
  474 int
  475 in_broadcast(in, ifp)
  476         struct in_addr in;
  477         struct ifnet *ifp;
  478 {
  479         register struct ifaddr *ifa;
  480         u_long t;
  481 
  482         if (in.s_addr == INADDR_BROADCAST ||
  483             in.s_addr == INADDR_ANY)
  484                 return 1;
  485         if ((ifp->if_flags & IFF_BROADCAST) == 0)
  486                 return 0;
  487         t = ntohl(in.s_addr);
  488         /*
  489          * Look through the list of addresses for a match
  490          * with a broadcast address.
  491          */
  492 #define ia ((struct in_ifaddr *)ifa)
  493         for (ifa = ifp->if_addrhead.tqh_first; ifa; 
  494              ifa = ifa->ifa_link.tqe_next)
  495                 if (ifa->ifa_addr->sa_family == AF_INET &&
  496                     (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
  497                      in.s_addr == ia->ia_netbroadcast.s_addr ||
  498                      /*
  499                       * Check for old-style (host 0) broadcast.
  500                       */
  501                      t == ia->ia_subnet || t == ia->ia_net) &&
  502                      /*
  503                       * Check for an all one subnetmask. These
  504                       * only exist when an interface gets a secondary
  505                       * address.
  506                       */
  507                      ia->ia_subnetmask != (u_long)0xffffffff)
  508                             return 1;
  509         return (0);
  510 #undef ia
  511 }
  512 /*
  513  * Add an address to the list of IP multicast addresses for a given interface.
  514  */
  515 struct in_multi *
  516 in_addmulti(ap, ifp)
  517         register struct in_addr *ap;
  518         register struct ifnet *ifp;
  519 {
  520         register struct in_multi *inm;
  521         int error;
  522         struct sockaddr_in sin;
  523         struct ifmultiaddr *ifma;
  524         int s = splnet();
  525 
  526         /*
  527          * Call generic routine to add membership or increment
  528          * refcount.  It wants addresses in the form of a sockaddr,
  529          * so we build one here (being careful to zero the unused bytes).
  530          */
  531         bzero(&sin, sizeof sin);
  532         sin.sin_family = AF_INET;
  533         sin.sin_len = sizeof sin;
  534         sin.sin_addr = *ap;
  535         error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
  536         if (error) {
  537                 splx(s);
  538                 return 0;
  539         }
  540 
  541         /*
  542          * If ifma->ifma_protospec is null, then if_addmulti() created
  543          * a new record.  Otherwise, we are done.
  544          */
  545         if (ifma->ifma_protospec != 0) {
  546                 splx(s);
  547                 return ifma->ifma_protospec;
  548         }
  549 
  550         /* XXX - if_addmulti uses M_WAITOK.  Can this really be called
  551            at interrupt time?  If so, need to fix if_addmulti. XXX */
  552         inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT);
  553         if (inm == NULL) {
  554                 splx(s);
  555                 return (NULL);
  556         }
  557 
  558         bzero(inm, sizeof *inm);
  559         inm->inm_addr = *ap;
  560         inm->inm_ifp = ifp;
  561         inm->inm_ifma = ifma;
  562         ifma->ifma_protospec = inm;
  563         LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
  564 
  565         /*
  566          * Let IGMP know that we have joined a new IP multicast group.
  567          */
  568         igmp_joingroup(inm);
  569         splx(s);
  570         return (inm);
  571 }
  572 
  573 /*
  574  * Delete a multicast address record.
  575  */
  576 void
  577 in_delmulti(inm)
  578         register struct in_multi *inm;
  579 {
  580         struct ifmultiaddr *ifma = inm->inm_ifma;
  581         struct in_multi my_inm;
  582         int s = splnet();
  583 
  584         my_inm.inm_ifp = NULL ; /* don't send the leave msg */
  585         if (ifma->ifma_refcount == 1) {
  586                 /*
  587                  * No remaining claims to this record; let IGMP know that
  588                  * we are leaving the multicast group.
  589                  * But do it after the if_delmulti() which might reset
  590                  * the interface and nuke the packet.
  591                  */
  592                 my_inm = *inm ;
  593                 ifma->ifma_protospec = 0;
  594                 LIST_REMOVE(inm, inm_link);
  595                 free(inm, M_IPMADDR);
  596         }
  597         /* XXX - should be separate API for when we have an ifma? */
  598         if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
  599         if (my_inm.inm_ifp != NULL)
  600                 igmp_leavegroup(&my_inm);
  601         splx(s);
  602 }
Cache object: be477fe146ced69d9b6981a49689bcb1
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FreeBSD/Linux Kernel Cross Reference sys/netinet/in.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet/in.c
