aarp.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/5.0/sys/netatalk/aarp.c 101937 2002-08-15 18:58:44Z rwatson $
    6  */
    7 
    8 #include "opt_atalk.h"
    9 #include "opt_mac.h"
   10 
   11 #include <sys/param.h>
   12 #include <sys/systm.h>
   13 #include <sys/mac.h>
   14 #include <sys/mbuf.h>
   15 #include <sys/kernel.h>
   16 #include <sys/socket.h>
   17 #include <sys/syslog.h>
   18 
   19 #include <net/if.h>
   20 
   21 #include <netinet/in.h>
   22 #undef s_net
   23 #include <netinet/if_ether.h>
   24 
   25 #include <netatalk/at.h>
   26 #include <netatalk/at_var.h>
   27 #include <netatalk/aarp.h>
   28 #include <netatalk/phase2.h>
   29 #include <netatalk/at_extern.h>
   30 
   31 static void aarptfree( struct aarptab *aat);
   32 static void at_aarpinput( struct arpcom *ac, struct mbuf *m);
   33 
   34 #define AARPTAB_BSIZ    9
   35 #define AARPTAB_NB      19
   36 #define AARPTAB_SIZE    (AARPTAB_BSIZ * AARPTAB_NB)
   37 static struct aarptab   aarptab[AARPTAB_SIZE];
   38 
   39 #define AARPTAB_HASH(a) \
   40     ((((a).s_net << 8 ) + (a).s_node ) % AARPTAB_NB )
   41 
   42 #define AARPTAB_LOOK(aat,addr) { \
   43     int         n; \
   44     aat = &aarptab[ AARPTAB_HASH(addr) * AARPTAB_BSIZ ]; \
   45     for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) \
   46         if ( aat->aat_ataddr.s_net == (addr).s_net && \
   47              aat->aat_ataddr.s_node == (addr).s_node ) \
   48             break; \
   49         if ( n >= AARPTAB_BSIZ ) \
   50             aat = 0; \
   51 }
   52 
   53 #define AARPT_AGE       (60 * 1)
   54 #define AARPT_KILLC     20
   55 #define AARPT_KILLI     3
   56 
   57 # if !defined( __FreeBSD__ )
   58 extern u_char                   etherbroadcastaddr[6];
   59 # endif /* __FreeBSD__ */
   60 
   61 static u_char atmulticastaddr[ 6 ] = {
   62     0x09, 0x00, 0x07, 0xff, 0xff, 0xff,
   63 };
   64 
   65 u_char  at_org_code[ 3 ] = {
   66     0x08, 0x00, 0x07,
   67 };
   68 u_char  aarp_org_code[ 3 ] = {
   69     0x00, 0x00, 0x00,
   70 };
   71 
   72 static struct callout_handle aarptimer_ch =
   73     CALLOUT_HANDLE_INITIALIZER(&aarptimer_ch);
   74 
   75 static void
   76 aarptimer(void *ignored)
   77 {
   78     struct aarptab      *aat;
   79     int                 i, s;
   80 
   81     aarptimer_ch = timeout( aarptimer, (caddr_t)0, AARPT_AGE * hz );
   82     aat = aarptab;
   83     for ( i = 0; i < AARPTAB_SIZE; i++, aat++ ) {
   84         if ( aat->aat_flags == 0 || ( aat->aat_flags & ATF_PERM ))
   85             continue;
   86         if ( ++aat->aat_timer < (( aat->aat_flags & ATF_COM ) ?
   87                 AARPT_KILLC : AARPT_KILLI ))
   88             continue;
   89         s = splimp();
   90         aarptfree( aat );
   91         splx( s );
   92     }
   93 }
   94 
   95 /* 
   96  * search through the network addresses to find one that includes
   97  * the given network.. remember to take netranges into
   98  * consideration.
   99  */
  100 struct at_ifaddr *
  101 at_ifawithnet(struct sockaddr_at  *sat )
  102 {
  103     struct at_ifaddr    *aa;
  104     struct sockaddr_at  *sat2;
  105 
  106         for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
  107                 sat2 = &(aa->aa_addr);
  108                 if ( sat2->sat_addr.s_net == sat->sat_addr.s_net ) {
  109                         break;
  110                 }
  111                 if( (aa->aa_flags & AFA_PHASE2 )
  112                 && (ntohs(aa->aa_firstnet) <= ntohs(sat->sat_addr.s_net))
  113                 && (ntohs(aa->aa_lastnet) >= ntohs(sat->sat_addr.s_net))) {
  114                         break;
  115                 }
  116         }
  117         return( aa );
  118 }
  119 
  120 static void
  121 aarpwhohas( struct arpcom *ac, struct sockaddr_at *sat )
  122 {
  123     struct mbuf         *m;
  124     struct ether_header *eh;
  125     struct ether_aarp   *ea;
  126     struct at_ifaddr    *aa;
  127     struct llc          *llc;
  128     struct sockaddr     sa;
  129 
  130     if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
  131         return;
  132     }
  133 #ifdef MAC
  134     mac_create_mbuf_linklayer(&ac->ac_if, m);
  135 #endif
  136     m->m_len = sizeof( *ea );
  137     m->m_pkthdr.len = sizeof( *ea );
  138     MH_ALIGN( m, sizeof( *ea ));
  139 
  140     ea = mtod( m, struct ether_aarp *);
  141     bzero((caddr_t)ea, sizeof( *ea ));
  142 
  143     ea->aarp_hrd = htons( AARPHRD_ETHER );
  144     ea->aarp_pro = htons( ETHERTYPE_AT );
  145     ea->aarp_hln = sizeof( ea->aarp_sha );
  146     ea->aarp_pln = sizeof( ea->aarp_spu );
  147     ea->aarp_op = htons( AARPOP_REQUEST );
  148     bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
  149             sizeof( ea->aarp_sha ));
  150 
  151     /*
  152      * We need to check whether the output ethernet type should
  153      * be phase 1 or 2. We have the interface that we'll be sending
  154      * the aarp out. We need to find an AppleTalk network on that
  155      * interface with the same address as we're looking for. If the
  156      * net is phase 2, generate an 802.2 and SNAP header.
  157      */
  158     if ((aa = at_ifawithnet( sat )) == NULL) {
  159         m_freem( m );
  160         return;
  161     }
  162 
  163     eh = (struct ether_header *)sa.sa_data;
  164 
  165     if ( aa->aa_flags & AFA_PHASE2 ) {
  166         bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
  167                 sizeof( eh->ether_dhost ));
  168         eh->ether_type = htons(sizeof(struct llc) + sizeof(struct ether_aarp));
  169         M_PREPEND( m, sizeof( struct llc ), M_TRYWAIT );
  170         llc = mtod( m, struct llc *);
  171         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
  172         llc->llc_control = LLC_UI;
  173         bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
  174         llc->llc_ether_type = htons( ETHERTYPE_AARP );
  175 
  176         bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
  177                sizeof( ea->aarp_spnet ));
  178         bcopy( &sat->sat_addr.s_net, ea->aarp_tpnet,
  179                sizeof( ea->aarp_tpnet ));
  180         ea->aarp_spnode = AA_SAT( aa )->sat_addr.s_node;
  181         ea->aarp_tpnode = sat->sat_addr.s_node;
  182     } else {
  183         bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
  184                 sizeof( eh->ether_dhost ));
  185         eh->ether_type = htons( ETHERTYPE_AARP );
  186 
  187         ea->aarp_spa = AA_SAT( aa )->sat_addr.s_node;
  188         ea->aarp_tpa = sat->sat_addr.s_node;
  189     }
  190 
  191 #ifdef NETATALKDEBUG
  192     printf("aarp: sending request for %u.%u\n",
  193            ntohs(AA_SAT( aa )->sat_addr.s_net),
  194            AA_SAT( aa )->sat_addr.s_node);
  195 #endif /* NETATALKDEBUG */
  196 
  197     sa.sa_len = sizeof( struct sockaddr );
  198     sa.sa_family = AF_UNSPEC;
  199     (*ac->ac_if.if_output)(&ac->ac_if,
  200         m, &sa, NULL);  /* XXX NULL should be routing information */
  201 }
  202 
  203 int
  204 aarpresolve( ac, m, destsat, desten )
  205     struct arpcom       *ac;
  206     struct mbuf         *m;
  207     struct sockaddr_at  *destsat;
  208     u_char              *desten;
  209 {
  210     struct at_ifaddr    *aa;
  211     struct aarptab      *aat;
  212     int                 s;
  213 
  214     if ( at_broadcast( destsat )) {
  215         m->m_flags |= M_BCAST;
  216         if ((aa = at_ifawithnet( destsat )) == NULL)  {
  217             m_freem( m );
  218             return( 0 );
  219         }
  220         if ( aa->aa_flags & AFA_PHASE2 ) {
  221             bcopy( (caddr_t)atmulticastaddr, (caddr_t)desten,
  222                     sizeof( atmulticastaddr ));
  223         } else {
  224             bcopy( (caddr_t)etherbroadcastaddr, (caddr_t)desten,
  225                     sizeof( etherbroadcastaddr ));
  226         }
  227         return( 1 );
  228     }
  229 
  230     s = splimp();
  231     AARPTAB_LOOK( aat, destsat->sat_addr );
  232     if ( aat == 0 ) {                   /* No entry */
  233         aat = aarptnew( &destsat->sat_addr );
  234         if ( aat == 0 ) {
  235             panic( "aarpresolve: no free entry" );
  236         }
  237         aat->aat_hold = m;
  238         aarpwhohas( ac, destsat );
  239         splx( s );
  240         return( 0 );
  241     }
  242     /* found an entry */
  243     aat->aat_timer = 0;
  244     if ( aat->aat_flags & ATF_COM ) {   /* entry is COMplete */
  245         bcopy( (caddr_t)aat->aat_enaddr, (caddr_t)desten,
  246                 sizeof( aat->aat_enaddr ));
  247         splx( s );
  248         return( 1 );
  249     }
  250     /* entry has not completed */
  251     if ( aat->aat_hold ) {
  252         m_freem( aat->aat_hold );
  253     }
  254     aat->aat_hold = m;
  255     aarpwhohas( ac, destsat );
  256     splx( s );
  257     return( 0 );
  258 }
  259 
  260 void
  261 aarpinput( ac, m )
  262     struct arpcom       *ac;
  263     struct mbuf         *m;
  264 {
  265     struct arphdr       *ar;
  266 
  267     if ( ac->ac_if.if_flags & IFF_NOARP )
  268         goto out;
  269 
  270     if ( m->m_len < sizeof( struct arphdr )) {
  271         goto out;
  272     }
  273 
  274     ar = mtod( m, struct arphdr *);
  275     if ( ntohs( ar->ar_hrd ) != AARPHRD_ETHER ) {
  276         goto out;
  277     }
  278     
  279     if ( m->m_len < sizeof( struct arphdr ) + 2 * ar->ar_hln +
  280             2 * ar->ar_pln ) {
  281         goto out;
  282     }
  283     
  284     switch( ntohs( ar->ar_pro )) {
  285     case ETHERTYPE_AT :
  286         at_aarpinput( ac, m );
  287         return;
  288 
  289     default:
  290         break;
  291     }
  292 
  293 out:
  294     m_freem( m );
  295 }
  296 
  297 static void
  298 at_aarpinput( struct arpcom *ac, struct mbuf *m)
  299 {
  300     struct ether_aarp   *ea;
  301     struct at_ifaddr    *aa;
  302     struct aarptab      *aat;
  303     struct ether_header *eh;
  304     struct llc          *llc;
  305     struct sockaddr_at  sat;
  306     struct sockaddr     sa;
  307     struct at_addr      spa, tpa, ma;
  308     int                 op;
  309     u_short             net;
  310 
  311     ea = mtod( m, struct ether_aarp *);
  312 
  313     /* Check to see if from my hardware address */
  314     if ( !bcmp(( caddr_t )ea->aarp_sha, ( caddr_t )ac->ac_enaddr,
  315             sizeof( ac->ac_enaddr ))) {
  316         m_freem( m );
  317         return;
  318     }
  319 
  320     op = ntohs( ea->aarp_op );
  321     bcopy( ea->aarp_tpnet, &net, sizeof( net ));
  322 
  323     if ( net != 0 ) { /* should be ATADDR_ANYNET? */
  324         sat.sat_len = sizeof(struct sockaddr_at);
  325         sat.sat_family = AF_APPLETALK;
  326         sat.sat_addr.s_net = net;
  327         if ((aa = at_ifawithnet( &sat )) == NULL) {
  328             m_freem( m );
  329             return;
  330         }
  331         bcopy( ea->aarp_spnet, &spa.s_net, sizeof( spa.s_net ));
  332         bcopy( ea->aarp_tpnet, &tpa.s_net, sizeof( tpa.s_net ));
  333     } else {
  334         /*
  335          * Since we don't know the net, we just look for the first
  336          * phase 1 address on the interface.
  337          */
  338         for (aa = (struct at_ifaddr *)TAILQ_FIRST(&ac->ac_if.if_addrhead); aa;
  339                 aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
  340             if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
  341                     ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
  342                 break;
  343             }
  344         }
  345         if ( aa == NULL ) {
  346             m_freem( m );
  347             return;
  348         }
  349         tpa.s_net = spa.s_net = AA_SAT( aa )->sat_addr.s_net;
  350     }
  351 
  352     spa.s_node = ea->aarp_spnode;
  353     tpa.s_node = ea->aarp_tpnode;
  354     ma.s_net = AA_SAT( aa )->sat_addr.s_net;
  355     ma.s_node = AA_SAT( aa )->sat_addr.s_node;
  356 
  357     /*
  358      * This looks like it's from us.
  359      */
  360     if ( spa.s_net == ma.s_net && spa.s_node == ma.s_node ) {
  361         if ( aa->aa_flags & AFA_PROBING ) {
  362             /*
  363              * We're probing, someone either responded to our probe, or
  364              * probed for the same address we'd like to use. Change the
  365              * address we're probing for.
  366              */
  367             untimeout( aarpprobe, ac, aa->aa_ch );
  368             wakeup( aa );
  369             m_freem( m );
  370             return;
  371         } else if ( op != AARPOP_PROBE ) {
  372             /*
  373              * This is not a probe, and we're not probing. This means
  374              * that someone's saying they have the same source address
  375              * as the one we're using. Get upset...
  376              */
  377             log( LOG_ERR,
  378                     "aarp: duplicate AT address!! %x:%x:%x:%x:%x:%x\n",
  379                     ea->aarp_sha[ 0 ], ea->aarp_sha[ 1 ], ea->aarp_sha[ 2 ],
  380                     ea->aarp_sha[ 3 ], ea->aarp_sha[ 4 ], ea->aarp_sha[ 5 ]);
  381             m_freem( m );
  382             return;
  383         }
  384     }
  385 
  386     AARPTAB_LOOK( aat, spa );
  387     if ( aat ) {
  388         if ( op == AARPOP_PROBE ) {
  389             /*
  390              * Someone's probing for spa, dealocate the one we've got,
  391              * so that if the prober keeps the address, we'll be able
  392              * to arp for him.
  393              */
  394             aarptfree( aat );
  395             m_freem( m );
  396             return;
  397         }
  398 
  399         bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
  400                 sizeof( ea->aarp_sha ));
  401         aat->aat_flags |= ATF_COM;
  402         if ( aat->aat_hold ) {
  403             struct mbuf *mhold = aat->aat_hold;
  404             aat->aat_hold = NULL;
  405             sat.sat_len = sizeof(struct sockaddr_at);
  406             sat.sat_family = AF_APPLETALK;
  407             sat.sat_addr = spa;
  408             (*ac->ac_if.if_output)( &ac->ac_if, mhold,
  409                     (struct sockaddr *)&sat, NULL); /* XXX */
  410         }
  411     } else if ((tpa.s_net == ma.s_net)
  412            && (tpa.s_node == ma.s_node)
  413            && (op != AARPOP_PROBE)
  414            && ((aat = aarptnew( &spa )) != NULL)) {
  415                 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
  416                     sizeof( ea->aarp_sha ));
  417                 aat->aat_flags |= ATF_COM;
  418     }
  419 
  420     /*
  421      * Don't respond to responses, and never respond if we're
  422      * still probing.
  423      */
  424     if ( tpa.s_net != ma.s_net || tpa.s_node != ma.s_node ||
  425             op == AARPOP_RESPONSE || ( aa->aa_flags & AFA_PROBING )) {
  426         m_freem( m );
  427         return;
  428     }
  429 
  430     bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )ea->aarp_tha,
  431             sizeof( ea->aarp_sha ));
  432     bcopy(( caddr_t )ac->ac_enaddr, ( caddr_t )ea->aarp_sha,
  433             sizeof( ea->aarp_sha ));
  434 
  435     /* XXX */
  436     eh = (struct ether_header *)sa.sa_data;
  437     bcopy(( caddr_t )ea->aarp_tha, ( caddr_t )eh->ether_dhost,
  438             sizeof( eh->ether_dhost ));
  439 
  440     if ( aa->aa_flags & AFA_PHASE2 ) {
  441         eh->ether_type = htons( sizeof( struct llc ) +
  442                 sizeof( struct ether_aarp ));
  443         M_PREPEND( m, sizeof( struct llc ), M_DONTWAIT );
  444         if ( m == NULL ) {
  445             return;
  446         }
  447         llc = mtod( m, struct llc *);
  448         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
  449         llc->llc_control = LLC_UI;
  450         bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
  451         llc->llc_ether_type = htons( ETHERTYPE_AARP );
  452 
  453         bcopy( ea->aarp_spnet, ea->aarp_tpnet, sizeof( ea->aarp_tpnet ));
  454         bcopy( &ma.s_net, ea->aarp_spnet, sizeof( ea->aarp_spnet ));
  455     } else {
  456         eh->ether_type = htons( ETHERTYPE_AARP );
  457     }
  458 
  459     ea->aarp_tpnode = ea->aarp_spnode;
  460     ea->aarp_spnode = ma.s_node;
  461     ea->aarp_op = htons( AARPOP_RESPONSE );
  462 
  463     sa.sa_len = sizeof( struct sockaddr );
  464     sa.sa_family = AF_UNSPEC;
  465     (*ac->ac_if.if_output)( &ac->ac_if, m, &sa, NULL); /* XXX */
  466     return;
  467 }
  468 
  469 static void
  470 aarptfree( struct aarptab *aat)
  471 {
  472 
  473     if ( aat->aat_hold )
  474         m_freem( aat->aat_hold );
  475     aat->aat_hold = NULL;
  476     aat->aat_timer = aat->aat_flags = 0;
  477     aat->aat_ataddr.s_net = 0;
  478     aat->aat_ataddr.s_node = 0;
  479 }
  480 
  481     struct aarptab *
  482 aarptnew( addr )
  483     struct at_addr      *addr;
  484 {
  485     int                 n;
  486     int                 oldest = -1;
  487     struct aarptab      *aat, *aato = NULL;
  488     static int          first = 1;
  489 
  490     if ( first ) {
  491         first = 0;
  492         aarptimer_ch = timeout( aarptimer, (caddr_t)0, hz );
  493     }
  494     aat = &aarptab[ AARPTAB_HASH( *addr ) * AARPTAB_BSIZ ];
  495     for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) {
  496         if ( aat->aat_flags == 0 )
  497             goto out;
  498         if ( aat->aat_flags & ATF_PERM )
  499             continue;
  500         if ((int) aat->aat_timer > oldest ) {
  501             oldest = aat->aat_timer;
  502             aato = aat;
  503         }
  504     }
  505     if ( aato == NULL )
  506         return( NULL );
  507     aat = aato;
  508     aarptfree( aat );
  509 out:
  510     aat->aat_ataddr = *addr;
  511     aat->aat_flags = ATF_INUSE;
  512     return( aat );
  513 }
  514 
  515 
  516 void
  517 aarpprobe( void *arg )
  518 {
  519     struct arpcom       *ac = arg;
  520     struct mbuf         *m;
  521     struct ether_header *eh;
  522     struct ether_aarp   *ea;
  523     struct at_ifaddr    *aa;
  524     struct llc          *llc;
  525     struct sockaddr     sa;
  526 
  527     /*
  528      * We need to check whether the output ethernet type should
  529      * be phase 1 or 2. We have the interface that we'll be sending
  530      * the aarp out. We need to find an AppleTalk network on that
  531      * interface with the same address as we're looking for. If the
  532      * net is phase 2, generate an 802.2 and SNAP header.
  533      */
  534     for (aa = (struct at_ifaddr *)TAILQ_FIRST(&ac->ac_if.if_addrhead); aa;
  535             aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
  536         if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
  537                 ( aa->aa_flags & AFA_PROBING )) {
  538             break;
  539         }
  540     }
  541     if ( aa == NULL ) {         /* serious error XXX */
  542         printf( "aarpprobe why did this happen?!\n" );
  543         return;
  544     }
  545 
  546     if ( aa->aa_probcnt <= 0 ) {
  547         aa->aa_flags &= ~AFA_PROBING;
  548         wakeup( aa );
  549         return;
  550     } else {
  551         aa->aa_ch = timeout( aarpprobe, (caddr_t)ac, hz / 5 );
  552     }
  553 
  554     if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
  555         return;
  556     }
  557 #ifdef MAC
  558     mac_create_mbuf_linklayer(&ac->ac_if, m);
  559 #endif
  560     m->m_len = sizeof( *ea );
  561     m->m_pkthdr.len = sizeof( *ea );
  562     MH_ALIGN( m, sizeof( *ea ));
  563 
  564     ea = mtod( m, struct ether_aarp *);
  565     bzero((caddr_t)ea, sizeof( *ea ));
  566 
  567     ea->aarp_hrd = htons( AARPHRD_ETHER );
  568     ea->aarp_pro = htons( ETHERTYPE_AT );
  569     ea->aarp_hln = sizeof( ea->aarp_sha );
  570     ea->aarp_pln = sizeof( ea->aarp_spu );
  571     ea->aarp_op = htons( AARPOP_PROBE );
  572     bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
  573             sizeof( ea->aarp_sha ));
  574 
  575     eh = (struct ether_header *)sa.sa_data;
  576 
  577     if ( aa->aa_flags & AFA_PHASE2 ) {
  578         bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
  579                 sizeof( eh->ether_dhost ));
  580         eh->ether_type = htons( sizeof( struct llc ) +
  581                 sizeof( struct ether_aarp ));
  582         M_PREPEND( m, sizeof( struct llc ), M_TRYWAIT );
  583         llc = mtod( m, struct llc *);
  584         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
  585         llc->llc_control = LLC_UI;
  586         bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
  587         llc->llc_ether_type = htons( ETHERTYPE_AARP );
  588 
  589         bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
  590                 sizeof( ea->aarp_spnet ));
  591         bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_tpnet,
  592                 sizeof( ea->aarp_tpnet ));
  593         ea->aarp_spnode = ea->aarp_tpnode = AA_SAT( aa )->sat_addr.s_node;
  594     } else {
  595         bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
  596                 sizeof( eh->ether_dhost ));
  597         eh->ether_type = htons( ETHERTYPE_AARP );
  598         ea->aarp_spa = ea->aarp_tpa = AA_SAT( aa )->sat_addr.s_node;
  599     }
  600 
  601 #ifdef NETATALKDEBUG
  602     printf("aarp: sending probe for %u.%u\n",
  603            ntohs(AA_SAT( aa )->sat_addr.s_net),
  604            AA_SAT( aa )->sat_addr.s_node);
  605 #endif /* NETATALKDEBUG */
  606 
  607     sa.sa_len = sizeof( struct sockaddr );
  608     sa.sa_family = AF_UNSPEC;
  609     (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, NULL); /* XXX */
  610     aa->aa_probcnt--;
  611 }
  612 
  613 void
  614 aarp_clean(void)
  615 {
  616     struct aarptab      *aat;
  617     int                 i;
  618 
  619     untimeout( aarptimer, 0, aarptimer_ch );
  620     for ( i = 0, aat = aarptab; i < AARPTAB_SIZE; i++, aat++ ) {
  621         if ( aat->aat_hold ) {
  622             m_freem( aat->aat_hold );
  623             aat->aat_hold = NULL;
  624         }
  625     }
  626 }
Cache object: 194f26b4a1163b6de092e2e4618fef41
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FreeBSD/Linux Kernel Cross Reference sys/netatalk/aarp.c

FreeBSD/Linux Kernel Cross Reference
sys/netatalk/aarp.c
