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/netipx/ipx.c

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    1 /*
    2  * Copyright (c) 1995, Mike Mitchell
    3  * Copyright (c) 1984, 1985, 1986, 1987, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by the University of
   17  *      California, Berkeley and its contributors.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  * 
   34  *      @(#)ipx.c
   35  *
   36  * $FreeBSD: releng/5.1/sys/netipx/ipx.c 111487 2003-02-25 15:10:23Z tjr $
   37  */
   38 
   39 #include <sys/param.h>
   40 #include <sys/systm.h>
   41 #include <sys/malloc.h>
   42 #include <sys/sockio.h>
   43 #include <sys/socket.h>
   44 
   45 #include <net/if.h>
   46 #include <net/route.h>
   47 
   48 #include <netipx/ipx.h>
   49 #include <netipx/ipx_if.h>
   50 #include <netipx/ipx_var.h>
   51 
   52 struct ipx_ifaddr *ipx_ifaddr;
   53 
   54 static  void ipx_ifscrub(struct ifnet *ifp, struct ipx_ifaddr *ia);
   55 static  int ipx_ifinit(struct ifnet *ifp, struct ipx_ifaddr *ia,
   56                        struct sockaddr_ipx *sipx, int scrub);
   57 
   58 /*
   59  * Generic internet control operations (ioctl's).
   60  */
   61 int
   62 ipx_control(so, cmd, data, ifp, td)
   63         struct socket *so;
   64         u_long cmd;
   65         caddr_t data;
   66         register struct ifnet *ifp;
   67         struct thread *td;
   68 {
   69         register struct ifreq *ifr = (struct ifreq *)data;
   70         register struct ipx_aliasreq *ifra = (struct ipx_aliasreq *)data;
   71         register struct ipx_ifaddr *ia;
   72         struct ifaddr *ifa;
   73         struct ipx_ifaddr *oia;
   74         int dstIsNew, hostIsNew;
   75         int error = 0;
   76 
   77         /*
   78          * Find address for this interface, if it exists.
   79          */
   80         if (ifp == NULL)
   81                 return (EADDRNOTAVAIL);
   82         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
   83                 if (ia->ia_ifp == ifp)
   84                         break;
   85 
   86         switch (cmd) {
   87 
   88         case SIOCGIFADDR:
   89                 if (ia == NULL)
   90                         return (EADDRNOTAVAIL);
   91                 *(struct sockaddr_ipx *)&ifr->ifr_addr = ia->ia_addr;
   92                 return (0);
   93 
   94         case SIOCGIFBRDADDR:
   95                 if (ia == NULL)
   96                         return (EADDRNOTAVAIL);
   97                 if ((ifp->if_flags & IFF_BROADCAST) == 0)
   98                         return (EINVAL);
   99                 *(struct sockaddr_ipx *)&ifr->ifr_dstaddr = ia->ia_broadaddr;
  100                 return (0);
  101 
  102         case SIOCGIFDSTADDR:
  103                 if (ia == NULL)
  104                         return (EADDRNOTAVAIL);
  105                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
  106                         return (EINVAL);
  107                 *(struct sockaddr_ipx *)&ifr->ifr_dstaddr = ia->ia_dstaddr;
  108                 return (0);
  109         }
  110 
  111         if (td && (error = suser(td)) != 0)
  112                 return (error);
  113 
  114         switch (cmd) {
  115         case SIOCAIFADDR:
  116         case SIOCDIFADDR:
  117                 if (ifra->ifra_addr.sipx_family == AF_IPX)
  118                     for (oia = ia; ia != NULL; ia = ia->ia_next) {
  119                         if (ia->ia_ifp == ifp  &&
  120                             ipx_neteq(ia->ia_addr.sipx_addr,
  121                                   ifra->ifra_addr.sipx_addr))
  122                             break;
  123                     }
  124                 if (cmd == SIOCDIFADDR && ia == NULL)
  125                         return (EADDRNOTAVAIL);
  126                 /* FALLTHROUGH */
  127 
  128         case SIOCSIFADDR:
  129         case SIOCSIFDSTADDR:
  130                 if (ia == NULL) {
  131                         oia = (struct ipx_ifaddr *)
  132                                 malloc(sizeof(*ia), M_IFADDR,
  133                                 M_WAITOK | M_ZERO);
  134                         if (oia == NULL)
  135                                 return (ENOBUFS);
  136                         if ((ia = ipx_ifaddr) != NULL) {
  137                                 for ( ; ia->ia_next != NULL; ia = ia->ia_next)
  138                                         ;
  139                                 ia->ia_next = oia;
  140                         } else
  141                                 ipx_ifaddr = oia;
  142                         ia = oia;
  143                         ifa = (struct ifaddr *)ia;
  144                         IFA_LOCK_INIT(ifa);
  145                         ifa->ifa_refcnt = 1;
  146                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
  147                         ia->ia_ifp = ifp;
  148                         ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
  149 
  150                         ifa->ifa_netmask = (struct sockaddr *)&ipx_netmask;
  151 
  152                         ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
  153                         if (ifp->if_flags & IFF_BROADCAST) {
  154                                 ia->ia_broadaddr.sipx_family = AF_IPX;
  155                                 ia->ia_broadaddr.sipx_len = sizeof(ia->ia_addr);
  156                                 ia->ia_broadaddr.sipx_addr.x_host = ipx_broadhost;
  157                         }
  158                 }
  159         }
  160 
  161         switch (cmd) {
  162 
  163         case SIOCSIFDSTADDR:
  164                 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
  165                         return (EINVAL);
  166                 if (ia->ia_flags & IFA_ROUTE) {
  167                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
  168                         ia->ia_flags &= ~IFA_ROUTE;
  169                 }
  170                 if (ifp->if_ioctl) {
  171                         error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, (void *)ia);
  172                         if (error)
  173                                 return (error);
  174                 }
  175                 *(struct sockaddr *)&ia->ia_dstaddr = ifr->ifr_dstaddr;
  176                 return (0);
  177 
  178         case SIOCSIFADDR:
  179                 return (ipx_ifinit(ifp, ia,
  180                                 (struct sockaddr_ipx *)&ifr->ifr_addr, 1));
  181 
  182         case SIOCDIFADDR:
  183                 ipx_ifscrub(ifp, ia);
  184                 ifa = (struct ifaddr *)ia;
  185                 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
  186                 oia = ia;
  187                 if (oia == (ia = ipx_ifaddr)) {
  188                         ipx_ifaddr = ia->ia_next;
  189                 } else {
  190                         while (ia->ia_next && (ia->ia_next != oia)) {
  191                                 ia = ia->ia_next;
  192                         }
  193                         if (ia->ia_next)
  194                             ia->ia_next = oia->ia_next;
  195                         else
  196                                 printf("Didn't unlink ipxifadr from list\n");
  197                 }
  198                 IFAFREE((&oia->ia_ifa));
  199                 return (0);
  200         
  201         case SIOCAIFADDR:
  202                 dstIsNew = 0;
  203                 hostIsNew = 1;
  204                 if (ia->ia_addr.sipx_family == AF_IPX) {
  205                         if (ifra->ifra_addr.sipx_len == 0) {
  206                                 ifra->ifra_addr = ia->ia_addr;
  207                                 hostIsNew = 0;
  208                         } else if (ipx_neteq(ifra->ifra_addr.sipx_addr,
  209                                          ia->ia_addr.sipx_addr))
  210                                 hostIsNew = 0;
  211                 }
  212                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
  213                     (ifra->ifra_dstaddr.sipx_family == AF_IPX)) {
  214                         if (hostIsNew == 0)
  215                                 ipx_ifscrub(ifp, ia);
  216                         ia->ia_dstaddr = ifra->ifra_dstaddr;
  217                         dstIsNew  = 1;
  218                 }
  219                 if (ifra->ifra_addr.sipx_family == AF_IPX &&
  220                                             (hostIsNew || dstIsNew))
  221                         error = ipx_ifinit(ifp, ia, &ifra->ifra_addr, 0);
  222                 return (error);
  223 
  224         default:
  225                 if (ifp->if_ioctl == NULL)
  226                         return (EOPNOTSUPP);
  227                 return ((*ifp->if_ioctl)(ifp, cmd, data));
  228         }
  229 }
  230 
  231 /*
  232 * Delete any previous route for an old address.
  233 */
  234 static void
  235 ipx_ifscrub(ifp, ia)
  236         register struct ifnet *ifp;
  237         register struct ipx_ifaddr *ia; 
  238 {
  239         if (ia->ia_flags & IFA_ROUTE) {
  240                 if (ifp->if_flags & IFF_POINTOPOINT) {
  241                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
  242                 } else
  243                         rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
  244                 ia->ia_flags &= ~IFA_ROUTE;
  245         }
  246 }
  247 /*
  248  * Initialize an interface's internet address
  249  * and routing table entry.
  250  */
  251 static int
  252 ipx_ifinit(ifp, ia, sipx, scrub)
  253         register struct ifnet *ifp;
  254         register struct ipx_ifaddr *ia;
  255         register struct sockaddr_ipx *sipx;
  256         int scrub;
  257 {
  258         struct sockaddr_ipx oldaddr;
  259         int s = splimp(), error;
  260 
  261         /*
  262          * Set up new addresses.
  263          */
  264         oldaddr = ia->ia_addr;
  265         ia->ia_addr = *sipx;
  266 
  267         /*
  268          * The convention we shall adopt for naming is that
  269          * a supplied address of zero means that "we don't care".
  270          * Use the MAC address of the interface. If it is an
  271          * interface without a MAC address, like a serial line, the
  272          * address must be supplied.
  273          *
  274          * Give the interface a chance to initialize
  275          * if this is its first address,
  276          * and to validate the address if necessary.
  277          */
  278         if (ifp->if_ioctl != NULL &&
  279             (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (void *)ia))) {
  280                 ia->ia_addr = oldaddr;
  281                 splx(s);
  282                 return (error);
  283         }
  284         splx(s);
  285         ia->ia_ifa.ifa_metric = ifp->if_metric;
  286         /*
  287          * Add route for the network.
  288          */
  289         if (scrub) {
  290                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
  291                 ipx_ifscrub(ifp, ia);
  292                 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
  293         }
  294         if (ifp->if_flags & IFF_POINTOPOINT)
  295                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
  296         else {
  297                 ia->ia_broadaddr.sipx_addr.x_net = ia->ia_addr.sipx_addr.x_net;
  298                 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_UP);
  299         }
  300         ia->ia_flags |= IFA_ROUTE;
  301         return (0);
  302 }
  303 
  304 /*
  305  * Return address info for specified internet network.
  306  */
  307 struct ipx_ifaddr *
  308 ipx_iaonnetof(dst)
  309         register struct ipx_addr *dst;
  310 {
  311         register struct ipx_ifaddr *ia;
  312         register struct ipx_addr *compare;
  313         register struct ifnet *ifp;
  314         struct ipx_ifaddr *ia_maybe = NULL;
  315         union ipx_net net = dst->x_net;
  316 
  317         for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next) {
  318                 if ((ifp = ia->ia_ifp) != NULL) {
  319                         if (ifp->if_flags & IFF_POINTOPOINT) {
  320                                 compare = &satoipx_addr(ia->ia_dstaddr);
  321                                 if (ipx_hosteq(*dst, *compare))
  322                                         return (ia);
  323                                 if (ipx_neteqnn(net, ia->ia_addr.sipx_addr.x_net))
  324                                         ia_maybe = ia;
  325                         } else {
  326                                 if (ipx_neteqnn(net, ia->ia_addr.sipx_addr.x_net))
  327                                         return (ia);
  328                         }
  329                 }
  330         }
  331         return (ia_maybe);
  332 }
  333 
  334 
  335 void
  336 ipx_printhost(addr)
  337 register struct ipx_addr *addr;
  338 {
  339         u_short port;
  340         struct ipx_addr work = *addr;
  341         register char *p; register u_char *q;
  342         register char *net = "", *host = "";
  343         char cport[10], chost[15], cnet[15];
  344 
  345         port = ntohs(work.x_port);
  346 
  347         if (ipx_nullnet(work) && ipx_nullhost(work)) {
  348 
  349                 if (port)
  350                         printf("*.%x", port);
  351                 else
  352                         printf("*.*");
  353 
  354                 return;
  355         }
  356 
  357         if (ipx_wildnet(work))
  358                 net = "any";
  359         else if (ipx_nullnet(work))
  360                 net = "*";
  361         else {
  362                 q = work.x_net.c_net;
  363                 snprintf(cnet, sizeof(cnet), "%x%x%x%x",
  364                         q[0], q[1], q[2], q[3]);
  365                 for (p = cnet; *p == '' && p < cnet + 8; p++)
  366                         continue;
  367                 net = p;
  368         }
  369 
  370         if (ipx_wildhost(work))
  371                 host = "any";
  372         else if (ipx_nullhost(work))
  373                 host = "*";
  374         else {
  375                 q = work.x_host.c_host;
  376                 snprintf(chost, sizeof(chost), "%x%x%x%x%x%x",
  377                         q[0], q[1], q[2], q[3], q[4], q[5]);
  378                 for (p = chost; *p == '' && p < chost + 12; p++)
  379                         continue;
  380                 host = p;
  381         }
  382 
  383         if (port) {
  384                 if (strcmp(host, "*") == 0) {
  385                         host = "";
  386                         snprintf(cport, sizeof(cport), "%x", port);
  387                 } else
  388                         snprintf(cport, sizeof(cport), ".%x", port);
  389         } else
  390                 *cport = 0;
  391 
  392         printf("%s.%s%s", net, host, cport);
  393 }

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