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

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    1 /*
    2  * Copyright (c) 1990,1991 Regents of The University of Michigan.
    3  * All Rights Reserved.
    4  *
    5  * $FreeBSD: releng/5.3/sys/netatalk/at_control.c 136588 2004-10-16 08:43:07Z cvs2svn $
    6  */
    7 
    8 #include <sys/param.h>
    9 #include <sys/systm.h>
   10 #include <sys/sockio.h>
   11 #include <sys/malloc.h>
   12 #include <sys/kernel.h>
   13 #include <sys/socket.h>
   14 #include <net/if.h>
   15 #include <net/route.h>
   16 #include <netinet/in.h>
   17 #undef s_net
   18 #include <netinet/if_ether.h>
   19 
   20 #include <netatalk/at.h>
   21 #include <netatalk/at_var.h>
   22 #include <netatalk/at_extern.h>
   23 
   24 struct at_ifaddr *at_ifaddr_list;
   25 
   26 static int aa_dorangeroute(struct ifaddr *ifa, u_int first, u_int last,
   27             int cmd);
   28 static int aa_addsingleroute(struct ifaddr *ifa, struct at_addr *addr,
   29             struct at_addr *mask);
   30 static int aa_delsingleroute(struct ifaddr *ifa, struct at_addr *addr,
   31             struct at_addr *mask);
   32 static int aa_dosingleroute(struct ifaddr *ifa, struct at_addr *addr,
   33             struct at_addr *mask, int cmd, int flags);
   34 static int at_scrub(struct ifnet *ifp, struct at_ifaddr *aa);
   35 static int at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa,
   36             struct sockaddr_at *sat);
   37 static int aa_claim_addr(struct ifaddr *ifa, struct sockaddr *gw);
   38 
   39 #define sateqaddr(a,b)                                                  \
   40         ((a)->sat_len == (b)->sat_len &&                                \
   41         (a)->sat_family == (b)->sat_family &&                           \
   42         (a)->sat_addr.s_net == (b)->sat_addr.s_net &&                   \
   43         (a)->sat_addr.s_node == (b)->sat_addr.s_node)
   44 
   45 int
   46 at_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
   47     struct thread *td)
   48 {
   49         struct ifreq *ifr = (struct ifreq *)data;
   50         struct sockaddr_at *sat;
   51         struct netrange *nr;
   52         struct at_aliasreq *ifra = (struct at_aliasreq *)data;
   53         struct at_ifaddr *aa0;
   54         struct at_ifaddr *aa = NULL;
   55         struct ifaddr *ifa, *ifa0;
   56 
   57         /*
   58          * If we have an ifp, then find the matching at_ifaddr if it exists
   59          */
   60         if (ifp != NULL) {
   61                 for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
   62                         if (aa->aa_ifp == ifp)
   63                                 break;
   64                 }
   65         }
   66 
   67         /*
   68          * In this first switch table we are basically getting ready for
   69          * the second one, by getting the atalk-specific things set up
   70          * so that they start to look more similar to other protocols etc.
   71          */
   72 
   73         switch (cmd) {
   74         case SIOCAIFADDR:
   75         case SIOCDIFADDR:
   76                 /*
   77                  * If we have an appletalk sockaddr, scan forward of where we
   78                  * are now on the at_ifaddr list to find one with a matching 
   79                  * address on this interface.  This may leave aa pointing to
   80                  * the first address on the NEXT interface!
   81                  */
   82                 if (ifra->ifra_addr.sat_family == AF_APPLETALK) {
   83                         for (; aa; aa = aa->aa_next) {
   84                                 if (aa->aa_ifp == ifp &&
   85                                     sateqaddr(&aa->aa_addr, &ifra->ifra_addr))
   86                                         break;
   87                         }
   88                 }
   89                 /*
   90                  * If we a retrying to delete an addres but didn't find such,
   91                  * then rewurn with an error
   92                  */
   93                 if (cmd == SIOCDIFADDR && aa == NULL)
   94                         return (EADDRNOTAVAIL);
   95                 /*FALLTHROUGH*/
   96 
   97         case SIOCSIFADDR:
   98                 /* 
   99                  * If we are not superuser, then we don't get to do these ops.
  100                  */
  101                 if (suser(td))
  102                         return (EPERM);
  103 
  104                 sat = satosat(&ifr->ifr_addr);
  105                 nr = (struct netrange *)sat->sat_zero;
  106                 if (nr->nr_phase == 1) {
  107                         /*
  108                          * Look for a phase 1 address on this interface.
  109                          * This may leave aa pointing to the first address on
  110                          * the NEXT interface!
  111                          */
  112                         for (; aa; aa = aa->aa_next) {
  113                                 if (aa->aa_ifp == ifp &&
  114                                     (aa->aa_flags & AFA_PHASE2) == 0)
  115                                         break;
  116                         }
  117                 } else {                /* default to phase 2 */
  118                         /*
  119                          * Look for a phase 2 address on this interface.
  120                          * This may leave aa pointing to the first address on
  121                          * the NEXT interface!
  122                          */
  123                         for (; aa; aa = aa->aa_next) {
  124                                 if (aa->aa_ifp == ifp && (aa->aa_flags &
  125                                     AFA_PHASE2))
  126                                         break;
  127                         }
  128                 }
  129 
  130                 if (ifp == NULL)
  131                         panic("at_control");
  132 
  133                 /*
  134                  * If we failed to find an existing at_ifaddr entry, then we 
  135                  * allocate a fresh one. 
  136                  */
  137                 if (aa == NULL) {
  138                         aa0 = malloc(sizeof(struct at_ifaddr), M_IFADDR,
  139                             M_WAITOK | M_ZERO);
  140                         if ((aa = at_ifaddr_list) != NULL) {
  141                                 /*
  142                                  * Don't let the loopback be first, since the
  143                                  * first address is the machine's default
  144                                  * address for binding.  If it is, stick
  145                                  * ourself in front, otherwise go to the back
  146                                  * of the list.
  147                                  */
  148                                 if (at_ifaddr_list->aa_ifp->if_flags &
  149                                     IFF_LOOPBACK) {
  150                                         aa = aa0;
  151                                         aa->aa_next = at_ifaddr_list;
  152                                         at_ifaddr_list = aa;
  153                                 } else {
  154                                         for (; aa->aa_next; aa = aa->aa_next)
  155                                                 ;
  156                                         aa->aa_next = aa0;
  157                                 }
  158                         } else
  159                                 at_ifaddr_list = aa0;
  160                         aa = aa0;
  161 
  162                         /*
  163                          * Find the end of the interface's addresses
  164                          * and link our new one on the end 
  165                          */
  166                         ifa = (struct ifaddr *)aa;
  167                         IFA_LOCK_INIT(ifa);
  168                         ifa->ifa_refcnt = 1;
  169                         TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
  170 
  171                         /*
  172                          * As the at_ifaddr contains the actual sockaddrs,
  173                          * and the ifaddr itself, link them al together
  174                          * correctly.
  175                          */
  176                         ifa->ifa_addr = (struct sockaddr *)&aa->aa_addr;
  177                         ifa->ifa_dstaddr = (struct sockaddr *)&aa->aa_addr;
  178                         ifa->ifa_netmask = (struct sockaddr *)&aa->aa_netmask;
  179 
  180                         /*
  181                          * Set/clear the phase 2 bit.
  182                          */
  183                         if (nr->nr_phase == 1)
  184                                 aa->aa_flags &= ~AFA_PHASE2;
  185                         else
  186                                 aa->aa_flags |= AFA_PHASE2;
  187 
  188                         /*
  189                          * and link it all together
  190                          */
  191                         aa->aa_ifp = ifp;
  192                 } else {
  193                         /*
  194                          * If we DID find one then we clobber any routes
  195                          * dependent on it..
  196                          */
  197                         at_scrub(ifp, aa);
  198                 }
  199                 break;
  200 
  201         case SIOCGIFADDR :
  202                 sat = satosat(&ifr->ifr_addr);
  203                 nr = (struct netrange *)sat->sat_zero;
  204                 if (nr->nr_phase == 1) {
  205                         /*
  206                          * If the request is specifying phase 1, then
  207                          * only look at a phase one address
  208                          */
  209                         for (; aa; aa = aa->aa_next) {
  210                                 if (aa->aa_ifp == ifp &&
  211                                     (aa->aa_flags & AFA_PHASE2) == 0)
  212                                         break;
  213                         }
  214                 } else {
  215                         /*
  216                          * default to phase 2
  217                          */
  218                         for (; aa; aa = aa->aa_next) {
  219                                 if (aa->aa_ifp == ifp && (aa->aa_flags &
  220                                     AFA_PHASE2))
  221                                         break;
  222                         }
  223                 }
  224 
  225                 if (aa == NULL)
  226                         return (EADDRNOTAVAIL);
  227                 break;
  228         }
  229 
  230         /*
  231          * By the time this switch is run we should be able to assume that
  232          * the "aa" pointer is valid when needed.
  233          */
  234         switch (cmd) {
  235         case SIOCGIFADDR:
  236 
  237                 /*
  238                  * copy the contents of the sockaddr blindly.
  239                  */
  240                 sat = (struct sockaddr_at *)&ifr->ifr_addr;
  241                 *sat = aa->aa_addr;
  242 
  243                 /* 
  244                  * and do some cleanups
  245                  */
  246                 ((struct netrange *)&sat->sat_zero)->nr_phase
  247                     = (aa->aa_flags & AFA_PHASE2) ? 2 : 1;
  248                 ((struct netrange *)&sat->sat_zero)->nr_firstnet =
  249                     aa->aa_firstnet;
  250                 ((struct netrange *)&sat->sat_zero)->nr_lastnet =
  251                     aa->aa_lastnet;
  252                 break;
  253 
  254         case SIOCSIFADDR:
  255                 return (at_ifinit(ifp, aa,
  256                     (struct sockaddr_at *)&ifr->ifr_addr));
  257 
  258         case SIOCAIFADDR:
  259                 if (sateqaddr(&ifra->ifra_addr, &aa->aa_addr))
  260                         return (0);
  261                 return (at_ifinit(ifp, aa,
  262                     (struct sockaddr_at *)&ifr->ifr_addr));
  263 
  264         case SIOCDIFADDR:
  265                 /*
  266                  * scrub all routes.. didn't we just DO this? XXX yes, del it
  267                  */
  268                 at_scrub(ifp, aa);
  269 
  270                 /*
  271                  * remove the ifaddr from the interface
  272                  */
  273                 ifa0 = (struct ifaddr *)aa;
  274                 TAILQ_REMOVE(&ifp->if_addrhead, ifa0, ifa_link);
  275 
  276                 /*
  277                  * Now remove the at_ifaddr from the parallel structure
  278                  * as well, or we'd be in deep trouble
  279                  */
  280                 aa0 = aa;
  281                 if (aa0 == (aa = at_ifaddr_list)) {
  282                         at_ifaddr_list = aa->aa_next;
  283                 } else {
  284                         while (aa->aa_next && (aa->aa_next != aa0))
  285                                 aa = aa->aa_next;
  286 
  287                         /*
  288                          * if we found it, remove it, otherwise we screwed up.
  289                          */
  290                         if (aa->aa_next)
  291                                 aa->aa_next = aa0->aa_next;
  292                         else
  293                                 panic("at_control");
  294                 }
  295 
  296                 /*
  297                  * Now reclaim the reference.
  298                  */
  299                 IFAFREE(ifa0);
  300                 break;
  301 
  302         default:
  303                 if (ifp == NULL || ifp->if_ioctl == NULL)
  304                         return (EOPNOTSUPP);
  305                 return ((*ifp->if_ioctl)(ifp, cmd, data));
  306         }
  307         return (0);
  308 }
  309 
  310 /* 
  311  * Given an interface and an at_ifaddr (supposedly on that interface)
  312  * remove  any routes that depend on this.
  313  * Why ifp is needed I'm not sure,
  314  * as aa->at_ifaddr.ifa_ifp should be the same.
  315  */
  316 static int
  317 at_scrub(struct ifnet *ifp, struct at_ifaddr *aa)
  318 {
  319         int error;
  320 
  321         if (aa->aa_flags & AFA_ROUTE) {
  322                 if (ifp->if_flags & IFF_LOOPBACK) {
  323                         if ((error = aa_delsingleroute(&aa->aa_ifa,
  324                             &aa->aa_addr.sat_addr, &aa->aa_netmask.sat_addr))
  325                             != 0)
  326                                 return (error);
  327                 } else if (ifp->if_flags & IFF_POINTOPOINT) {
  328                         if ((error = rtinit(&aa->aa_ifa, RTM_DELETE,
  329                             RTF_HOST)) != 0)
  330                                 return (error);
  331                 } else if (ifp->if_flags & IFF_BROADCAST) {
  332                         error = aa_dorangeroute(&aa->aa_ifa,
  333                             ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
  334                             RTM_DELETE);
  335                 }
  336                 aa->aa_ifa.ifa_flags &= ~IFA_ROUTE;
  337                 aa->aa_flags &= ~AFA_ROUTE;
  338         }
  339         return (0);
  340 }
  341 
  342 /*
  343  * given an at_ifaddr,a sockaddr_at and an ifp,
  344  * bang them all together at high speed and see what happens
  345  */
  346 static int 
  347 at_ifinit(struct ifnet *ifp, struct at_ifaddr *aa, struct sockaddr_at *sat)
  348 {
  349         struct netrange nr, onr;
  350         struct sockaddr_at oldaddr;
  351         int error = 0, i, j;
  352         int netinc, nodeinc, nnets;
  353         u_short net;
  354 
  355         /* 
  356          * save the old addresses in the at_ifaddr just in case we need them.
  357          */
  358         oldaddr = aa->aa_addr;
  359         onr.nr_firstnet = aa->aa_firstnet;
  360         onr.nr_lastnet = aa->aa_lastnet;
  361 
  362         /*
  363          * take the address supplied as an argument, and add it to the 
  364          * at_ifnet (also given). Remember ing to update
  365          * those parts of the at_ifaddr that need special processing
  366          */
  367         bzero(AA_SAT(aa), sizeof(struct sockaddr_at));
  368         bcopy(sat->sat_zero, &nr, sizeof(struct netrange));
  369         bcopy(sat->sat_zero, AA_SAT(aa)->sat_zero, sizeof(struct netrange));
  370         nnets = ntohs(nr.nr_lastnet) - ntohs(nr.nr_firstnet) + 1;
  371         aa->aa_firstnet = nr.nr_firstnet;
  372         aa->aa_lastnet = nr.nr_lastnet;
  373 
  374 /* XXX ALC */
  375 #if 0
  376         printf("at_ifinit: %s: %u.%u range %u-%u phase %d\n",
  377             ifp->if_name,
  378             ntohs(sat->sat_addr.s_net), sat->sat_addr.s_node,
  379             ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
  380             (aa->aa_flags & AFA_PHASE2) ? 2 : 1);
  381 #endif
  382 
  383         /*
  384          * We could eliminate the need for a second phase 1 probe (post
  385          * autoconf) if we check whether we're resetting the node. Note
  386          * that phase 1 probes use only nodes, not net.node pairs.  Under
  387          * phase 2, both the net and node must be the same.
  388          */
  389         if (ifp->if_flags & IFF_LOOPBACK) {
  390                 AA_SAT(aa)->sat_len = sat->sat_len;
  391                 AA_SAT(aa)->sat_family = AF_APPLETALK;
  392                 AA_SAT(aa)->sat_addr.s_net = sat->sat_addr.s_net;
  393                 AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node;
  394 #if 0
  395         } else if (fp->if_flags & IFF_POINTOPOINT) {
  396                 /* unimplemented */
  397                 /*
  398                  * we'd have to copy the dstaddr field over from the sat 
  399                  * but it's not clear that it would contain the right info..
  400                  */
  401 #endif
  402         } else {
  403                 /*
  404                  * We are a normal (probably ethernet) interface.
  405                  * apply the new address to the interface structures etc.
  406                  * We will probe this address on the net first, before
  407                  * applying it to ensure that it is free.. If it is not, then
  408                  * we will try a number of other randomly generated addresses
  409                  * in this net and then increment the net.  etc.etc. until
  410                  * we find an unused address.
  411                  */
  412                 aa->aa_flags |= AFA_PROBING; /* not loopback we Must probe? */
  413                 AA_SAT(aa)->sat_len = sizeof(struct sockaddr_at);
  414                 AA_SAT(aa)->sat_family = AF_APPLETALK;
  415                 if (aa->aa_flags & AFA_PHASE2) {
  416                         if (sat->sat_addr.s_net == ATADDR_ANYNET) {
  417                                 /*
  418                                  * If we are phase 2, and the net was not
  419                                  * specified then we select a random net
  420                                  * within the supplied netrange.
  421                                  * XXX use /dev/random?
  422                                  */
  423                                 if (nnets != 1)
  424                                         net = ntohs(nr.nr_firstnet) +
  425                                             time_second % (nnets - 1);
  426                                 else
  427                                         net = ntohs(nr.nr_firstnet);
  428                         } else {
  429                                 /*
  430                                  * if a net was supplied, then check that it
  431                                  * is within the netrange. If it is not then
  432                                  * replace the old values and return an error
  433                                  */
  434                                 if (ntohs(sat->sat_addr.s_net) <
  435                                     ntohs(nr.nr_firstnet) ||
  436                                     ntohs(sat->sat_addr.s_net) >
  437                                     ntohs(nr.nr_lastnet)) {
  438                                         aa->aa_addr = oldaddr;
  439                                         aa->aa_firstnet = onr.nr_firstnet;
  440                                         aa->aa_lastnet = onr.nr_lastnet;
  441                                         return (EINVAL);
  442                                 }
  443                                 /*
  444                                  * otherwise just use the new net number..
  445                                  */
  446                                 net = ntohs(sat->sat_addr.s_net);
  447                         }
  448                 } else {
  449                         /*
  450                          * we must be phase one, so just use whatever we were
  451                          * given.  I guess it really isn't going to be
  452                          * used... RIGHT?
  453                          */
  454                         net = ntohs(sat->sat_addr.s_net);
  455                 }
  456 
  457                 /* 
  458                  * set the node part of the address into the ifaddr.
  459                  * If it's not specified, be random about it...
  460                  * XXX use /dev/random?
  461                  */
  462                 if (sat->sat_addr.s_node == ATADDR_ANYNODE)
  463                         AA_SAT(aa)->sat_addr.s_node = time_second;
  464                 else
  465                         AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node;
  466 
  467                 /* 
  468                  * Copy the phase.
  469                  */
  470                 AA_SAT(aa)->sat_range.r_netrange.nr_phase =
  471                     ((aa->aa_flags & AFA_PHASE2) ? 2:1);
  472 
  473                 /* 
  474                  * step through the nets in the range
  475                  * starting at the (possibly random) start point.
  476                  */
  477                 for (i = nnets, netinc = 1; i > 0; net =
  478                     ntohs(nr.nr_firstnet) + ((net - ntohs(nr.nr_firstnet) +
  479                     netinc) % nnets), i--) {
  480                         AA_SAT(aa)->sat_addr.s_net = htons(net);
  481 
  482                         /*
  483                          * using a rather strange stepping method,
  484                          * stagger through the possible node addresses
  485                          * Once again, starting at the (possibly random)
  486                          * initial node address.
  487                          */
  488                         for (j = 0, nodeinc = time_second | 1; j < 256;
  489                             j++, AA_SAT(aa)->sat_addr.s_node += nodeinc) {
  490                                 if (AA_SAT(aa)->sat_addr.s_node > 253 ||
  491                                     AA_SAT(aa)->sat_addr.s_node < 1)
  492                                         continue;
  493                                 aa->aa_probcnt = 10;
  494         
  495                                 /*
  496                                  * start off the probes as an asynchronous
  497                                  * activity.  though why wait 200mSec?
  498                                  */
  499                                 aa->aa_ch = timeout(aarpprobe, (caddr_t)ifp,
  500                                     hz / 5);
  501                                 if (tsleep(aa, PPAUSE|PCATCH, "at_ifinit",
  502                                     0)) {
  503                                         /*
  504                                          * theoretically we shouldn't time
  505                                          * out here so if we returned with an
  506                                          * error..
  507                                          */
  508                                         printf("at_ifinit: why did this "
  509                                             "happen?!\n");
  510                                         aa->aa_addr = oldaddr;
  511                                         aa->aa_firstnet = onr.nr_firstnet;
  512                                         aa->aa_lastnet = onr.nr_lastnet;
  513                                         return (EINTR);
  514                                 }
  515 
  516                                 /* 
  517                                  * The async activity should have woken us
  518                                  * up.  We need to see if it was successful
  519                                  * in finding a free spot, or if we need to
  520                                  * iterate to the next address to try.
  521                                  */
  522                                 if ((aa->aa_flags & AFA_PROBING) == 0)
  523                                         break;
  524                         }
  525 
  526                         /*
  527                          * of course we need to break out through two loops...
  528                          */
  529                         if ((aa->aa_flags & AFA_PROBING) == 0)
  530                                 break;
  531                         /* reset node for next network */
  532                         AA_SAT(aa)->sat_addr.s_node = time_second;
  533                 }
  534 
  535                 /*
  536                  * if we are still trying to probe, then we have finished all
  537                  * the possible addresses, so we need to give up
  538                  */
  539                 if (aa->aa_flags & AFA_PROBING) {
  540                         aa->aa_addr = oldaddr;
  541                         aa->aa_firstnet = onr.nr_firstnet;
  542                         aa->aa_lastnet = onr.nr_lastnet;
  543                         return (EADDRINUSE);
  544                 }
  545         }
  546 
  547         /* 
  548          * Now that we have selected an address, we need to tell the interface
  549          * about it, just in case it needs to adjust something.
  550          */
  551         if (ifp->if_ioctl != NULL &&
  552             (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)aa))) {
  553                 /*
  554                  * of course this could mean that it objects violently
  555                  * so if it does, we back out again..
  556                  */
  557                 aa->aa_addr = oldaddr;
  558                 aa->aa_firstnet = onr.nr_firstnet;
  559                 aa->aa_lastnet = onr.nr_lastnet;
  560                 return (error);
  561         }
  562 
  563         /* 
  564          * set up the netmask part of the at_ifaddr
  565          * and point the appropriate pointer in the ifaddr to it.
  566          * probably pointless, but what the heck.. XXX
  567          */
  568         bzero(&aa->aa_netmask, sizeof(aa->aa_netmask));
  569         aa->aa_netmask.sat_len = sizeof(struct sockaddr_at);
  570         aa->aa_netmask.sat_family = AF_APPLETALK;
  571         aa->aa_netmask.sat_addr.s_net = 0xffff;
  572         aa->aa_netmask.sat_addr.s_node = 0;
  573         aa->aa_ifa.ifa_netmask =(struct sockaddr *) &(aa->aa_netmask); /* XXX */
  574 
  575         /*
  576          * Initialize broadcast (or remote p2p) address
  577          */
  578         bzero(&aa->aa_broadaddr, sizeof(aa->aa_broadaddr));
  579         aa->aa_broadaddr.sat_len = sizeof(struct sockaddr_at);
  580         aa->aa_broadaddr.sat_family = AF_APPLETALK;
  581 
  582         aa->aa_ifa.ifa_metric = ifp->if_metric;
  583         if (ifp->if_flags & IFF_BROADCAST) {
  584                 aa->aa_broadaddr.sat_addr.s_net = htons(0);
  585                 aa->aa_broadaddr.sat_addr.s_node = 0xff;
  586                 aa->aa_ifa.ifa_broadaddr = (struct sockaddr *)
  587                     &aa->aa_broadaddr;
  588                 /* add the range of routes needed */
  589                 error = aa_dorangeroute(&aa->aa_ifa, ntohs(aa->aa_firstnet),
  590                     ntohs(aa->aa_lastnet), RTM_ADD);
  591         } else if (ifp->if_flags & IFF_POINTOPOINT) {
  592                 struct at_addr  rtaddr, rtmask;
  593 
  594                 bzero(&rtaddr, sizeof(rtaddr));
  595                 bzero(&rtmask, sizeof(rtmask));
  596                 /* fill in the far end if we know it here XXX */
  597                 aa->aa_ifa.ifa_dstaddr = (struct sockaddr *) &aa->aa_dstaddr;
  598                 error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
  599         } else if (ifp->if_flags & IFF_LOOPBACK) {
  600                 struct at_addr  rtaddr, rtmask;
  601 
  602                 bzero(&rtaddr, sizeof(rtaddr));
  603                 bzero(&rtmask, sizeof(rtmask));
  604                 rtaddr.s_net = AA_SAT(aa)->sat_addr.s_net;
  605                 rtaddr.s_node = AA_SAT(aa)->sat_addr.s_node;
  606                 rtmask.s_net = 0xffff;
  607                  /* XXX should not be so.. should be HOST route */
  608                 rtmask.s_node = 0x0;
  609                 error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
  610         }
  611 
  612         /*
  613          * set the address of our "check if this addr is ours" routine.
  614          */
  615         aa->aa_ifa.ifa_claim_addr = aa_claim_addr;
  616 
  617         /*
  618          * of course if we can't add these routes we back out, but it's
  619          * getting risky by now XXX
  620          */
  621         if (error) {
  622                 at_scrub(ifp, aa);
  623                 aa->aa_addr = oldaddr;
  624                 aa->aa_firstnet = onr.nr_firstnet;
  625                 aa->aa_lastnet = onr.nr_lastnet;
  626                 return (error);
  627         }
  628 
  629         /*
  630          * note that the address has a route associated with it....
  631          */
  632         aa->aa_ifa.ifa_flags |= IFA_ROUTE;
  633         aa->aa_flags |= AFA_ROUTE;
  634         return (0);
  635 }
  636 
  637 /*
  638  * check whether a given address is a broadcast address for us..
  639  */
  640 int
  641 at_broadcast(struct sockaddr_at *sat)
  642 {
  643         struct at_ifaddr *aa;
  644 
  645         /*
  646          * If the node is not right, it can't be a broadcast 
  647          */
  648         if (sat->sat_addr.s_node != ATADDR_BCAST)
  649                 return (0);
  650 
  651         /*
  652          * If the node was right then if the net is right, it's a broadcast
  653          */
  654         if (sat->sat_addr.s_net == ATADDR_ANYNET)
  655                 return (1);
  656 
  657         /*
  658          * failing that, if the net is one we have, it's a broadcast as well.
  659          */
  660         for (aa = at_ifaddr_list; aa != NULL; aa = aa->aa_next) {
  661                 if ((aa->aa_ifp->if_flags & IFF_BROADCAST)
  662                     && (ntohs(sat->sat_addr.s_net) >= ntohs(aa->aa_firstnet)
  663                     && ntohs(sat->sat_addr.s_net) <= ntohs(aa->aa_lastnet)))
  664                         return (1);
  665         }
  666         return (0);
  667 }
  668 
  669 /*
  670  * aa_dorangeroute()
  671  *
  672  * Add a route for a range of networks from bot to top - 1.
  673  * Algorithm:
  674  *
  675  * Split the range into two subranges such that the middle
  676  * of the two ranges is the point where the highest bit of difference
  677  * between the two addresses makes its transition.
  678  * Each of the upper and lower ranges might not exist, or might be 
  679  * representable by 1 or more netmasks. In addition, if both
  680  * ranges can be represented by the same netmask, then they can be merged
  681  * by using the next higher netmask..
  682  */
  683 
  684 static int
  685 aa_dorangeroute(struct ifaddr *ifa, u_int bot, u_int top, int cmd)
  686 {
  687         u_int mask1;
  688         struct at_addr addr;
  689         struct at_addr mask;
  690         int error;
  691 
  692         /*
  693          * slight sanity check
  694          */
  695         if (bot > top) return (EINVAL);
  696 
  697         addr.s_node = 0;
  698         mask.s_node = 0;
  699         /*
  700          * just start out with the lowest boundary
  701          * and keep extending the mask till it's too big.
  702          */
  703         
  704          while (bot <= top) {
  705                 mask1 = 1;
  706                 while (((bot & ~mask1) >= bot) && ((bot | mask1) <= top)) {
  707                         mask1 <<= 1;
  708                         mask1 |= 1;
  709                 }
  710                 mask1 >>= 1;
  711                 mask.s_net = htons(~mask1);
  712                 addr.s_net = htons(bot);
  713                 if (cmd == RTM_ADD) {
  714                         error =  aa_addsingleroute(ifa,&addr,&mask);
  715                         if (error) {
  716                                 /* XXX clean up? */
  717                                 return (error);
  718                         }
  719                 } else
  720                         error =  aa_delsingleroute(ifa,&addr,&mask);
  721                 bot = (bot | mask1) + 1;
  722         }
  723         return (0);
  724 }
  725 
  726 static int
  727 aa_addsingleroute(struct ifaddr *ifa, struct at_addr *addr,
  728     struct at_addr *mask)
  729 {
  730         int error;
  731 
  732 #if 0
  733         printf("aa_addsingleroute: %x.%x mask %x.%x ...\n",
  734             ntohs(addr->s_net), addr->s_node, ntohs(mask->s_net),
  735             mask->s_node);
  736 #endif
  737 
  738         error = aa_dosingleroute(ifa, addr, mask, RTM_ADD, RTF_UP);
  739         if (error)
  740                 printf("aa_addsingleroute: error %d\n", error);
  741         return (error);
  742 }
  743 
  744 static int
  745 aa_delsingleroute(struct ifaddr *ifa, struct at_addr *addr,
  746     struct at_addr *mask)
  747 {
  748         int error;
  749 
  750         error = aa_dosingleroute(ifa, addr, mask, RTM_DELETE, 0);
  751         if (error)
  752                 printf("aa_delsingleroute: error %d\n", error);
  753         return (error);
  754 }
  755 
  756 static int
  757 aa_dosingleroute(struct ifaddr *ifa, struct at_addr *at_addr,
  758     struct at_addr *at_mask, int cmd, int flags)
  759 {
  760         struct sockaddr_at addr, mask;
  761 
  762         bzero(&addr, sizeof(addr));
  763         bzero(&mask, sizeof(mask));
  764         addr.sat_family = AF_APPLETALK;
  765         addr.sat_len = sizeof(struct sockaddr_at);
  766         addr.sat_addr.s_net = at_addr->s_net;
  767         addr.sat_addr.s_node = at_addr->s_node;
  768         mask.sat_family = AF_APPLETALK;
  769         mask.sat_len = sizeof(struct sockaddr_at);
  770         mask.sat_addr.s_net = at_mask->s_net;
  771         mask.sat_addr.s_node = at_mask->s_node;
  772         if (at_mask->s_node)
  773                 flags |= RTF_HOST;
  774         return (rtrequest(cmd, (struct sockaddr *) &addr,
  775             (flags & RTF_HOST)?(ifa->ifa_dstaddr):(ifa->ifa_addr),
  776             (struct sockaddr *) &mask, flags, NULL));
  777 }
  778 
  779 #if 0
  780 
  781 static void
  782 aa_clean(void)
  783 {
  784         struct at_ifaddr *aa;
  785         struct ifaddr *ifa;
  786         struct ifnet *ifp;
  787 
  788         while ((aa = at_ifaddr_list) != NULL) {
  789                 ifp = aa->aa_ifp;
  790                 at_scrub(ifp, aa);
  791                 at_ifaddr_list = aa->aa_next;
  792                 if ((ifa = ifp->if_addrlist) == (struct ifaddr *)aa)
  793                         ifp->if_addrlist = ifa->ifa_next;
  794                 else {
  795                         while (ifa->ifa_next &&
  796                             (ifa->ifa_next != (struct ifaddr *)aa))
  797                                 ifa = ifa->ifa_next;
  798                         if (ifa->ifa_next)
  799                                 ifa->ifa_next =
  800                                     ((struct ifaddr *)aa)->ifa_next;
  801                         else
  802                                 panic("at_entry");
  803                 }
  804         }
  805 }
  806 
  807 #endif
  808 
  809 static int
  810 aa_claim_addr(struct ifaddr *ifa, struct sockaddr *gw0)
  811 {
  812         struct sockaddr_at *addr = (struct sockaddr_at *)ifa->ifa_addr;
  813         struct sockaddr_at *gw = (struct sockaddr_at *)gw0;
  814 
  815         switch (gw->sat_range.r_netrange.nr_phase) {
  816         case 1:
  817                 if(addr->sat_range.r_netrange.nr_phase == 1)
  818                         return (1);
  819 
  820         case 0:
  821         case 2:
  822                 /*
  823                  * if it's our net (including 0),
  824                  * or netranges are valid, and we are in the range,
  825                  * then it's ours.
  826                  */
  827                 if ((addr->sat_addr.s_net == gw->sat_addr.s_net)
  828                     || ((addr->sat_range.r_netrange.nr_lastnet)
  829                     && (ntohs(gw->sat_addr.s_net) >=
  830                     ntohs(addr->sat_range.r_netrange.nr_firstnet))
  831                     && (ntohs(gw->sat_addr.s_net) <=
  832                     ntohs(addr->sat_range.r_netrange.nr_lastnet))))
  833                         return (1);
  834                 break;
  835         default:
  836                 printf("atalk: bad phase\n");
  837         }
  838         return (0);
  839 }

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