sys/netproto/atalk/aarp.c

   1 /*
   2  * Copyright (c) 1990,1991 Regents of The University of Michigan.
   3  * All Rights Reserved.
   4  *
   5  * $FreeBSD: src/sys/netatalk/aarp.c,v 1.12.2.2 2001/06/23 20:43:09 iedowse Exp $
   6  * $DragonFly: src/sys/netproto/atalk/aarp.c,v 1.22 2008/03/07 11:34:21 sephe Exp $
   7  */
   8
   9 #include "opt_atalk.h"
  10
  11 #include <sys/param.h>
  12 #include <sys/systm.h>
  13 #include <sys/mbuf.h>
  14 #include <sys/kernel.h>
  15 #include <sys/socket.h>
  16 #include <sys/syslog.h>
  17
  18 #include <sys/thread2.h>
  19 #include <sys/msgport2.h>
  20
  21 #include <net/if.h>
  22 #include <net/netisr.h>
  23
  24 #include <netinet/in.h>
  25 #undef s_net
  26 #include <netinet/if_ether.h>
  27
  28 #include "at.h"
  29 #include "at_var.h"
  30 #include "aarp.h"
  31 #include "phase2.h"
  32 #include "at_extern.h"
  33
  34 static void aarptfree( struct aarptab *aat);
  35 static void at_aarpinput( struct arpcom *ac, struct mbuf *m);
  36
  37 #define AARPTAB_BSIZ    9
  38 #define AARPTAB_NB      19
  39 #define AARPTAB_SIZE    (AARPTAB_BSIZ * AARPTAB_NB)
  40 static struct aarptab   aarptab[AARPTAB_SIZE];
  41
  42 #define AARPTAB_HASH(a) \
  43     ((((a).s_net << 8 ) + (a).s_node ) % AARPTAB_NB )
  44
  45 #define AARPTAB_LOOK(aat,addr) { \
  46     int         n; \
  47     aat = &aarptab[ AARPTAB_HASH(addr) * AARPTAB_BSIZ ]; \
  48     for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) \
  49         if ( aat->aat_ataddr.s_net == (addr).s_net && \
  50              aat->aat_ataddr.s_node == (addr).s_node ) \
  51             break; \
  52         if ( n >= AARPTAB_BSIZ ) \
  53             aat = 0; \
  54 }
  55
  56 #define AARPT_AGE       (60 * 1)
  57 #define AARPT_KILLC     20
  58 #define AARPT_KILLI     3
  59
  60 static u_char atmulticastaddr[ 6 ] = {
  61     0x09, 0x00, 0x07, 0xff, 0xff, 0xff,
  62 };
  63
  64 u_char  at_org_code[ 3 ] = {
  65     0x08, 0x00, 0x07,
  66 };
  67 u_char  aarp_org_code[ 3 ] = {
  68     0x00, 0x00, 0x00,
  69 };
  70
  71 static struct callout aarptimer_ch;
  72
  73 static void
  74 aarptimer(void *ignored)
  75 {
  76     struct aarptab      *aat;
  77     int                 i;
  78
  79     aat = aarptab;
  80     for ( i = 0; i < AARPTAB_SIZE; i++, aat++ ) {
  81         if ( aat->aat_flags == 0 || ( aat->aat_flags & ATF_PERM ))
  82             continue;
  83         if ( ++aat->aat_timer < (( aat->aat_flags & ATF_COM ) ?
  84                 AARPT_KILLC : AARPT_KILLI ))
  85             continue;
  86         crit_enter();
  87         aarptfree( aat );
  88         crit_exit();
  89     }
  90     callout_reset(&aarptimer_ch, AARPT_AGE * hz, aarptimer, NULL);
  91 }
  92
  93 /*
  94  * search through the network addresses to find one that includes
  95  * the given network.. remember to take netranges into
  96  * consideration.
  97  */
  98 struct at_ifaddr *
  99 at_ifawithnet(struct sockaddr_at *sat)
 100 {
 101     struct at_ifaddr    *aa;
 102     struct sockaddr_at  *sat2;
 103
 104         for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
 105                 sat2 = &(aa->aa_addr);
 106                 if ( sat2->sat_addr.s_net == sat->sat_addr.s_net ) {
 107                         break;
 108                 }
 109                 if( (aa->aa_flags & AFA_PHASE2 )
 110                 && (ntohs(aa->aa_firstnet) <= ntohs(sat->sat_addr.s_net))
 111                 && (ntohs(aa->aa_lastnet) >= ntohs(sat->sat_addr.s_net))) {
 112                         break;
 113                 }
 114         }
 115         return( aa );
 116 }
 117
 118 static void
 119 aarpwhohas(struct arpcom *ac, struct sockaddr_at *sat)
 120 {
 121     struct mbuf         *m;
 122     struct ether_header *eh;
 123     struct ether_aarp   *ea;
 124     struct at_ifaddr    *aa;
 125     struct llc          *llc;
 126     struct sockaddr     sa;
 127
 128     if (( m = m_gethdr( MB_DONTWAIT, MT_DATA )) == NULL ) {
 129         return;
 130     }
 131     m->m_len = sizeof( *ea );
 132     m->m_pkthdr.len = sizeof( *ea );
 133     MH_ALIGN( m, sizeof( *ea ));
 134
 135     ea = mtod( m, struct ether_aarp *);
 136     bzero((caddr_t)ea, sizeof( *ea ));
 137
 138     ea->aarp_hrd = htons( AARPHRD_ETHER );
 139     ea->aarp_pro = htons( ETHERTYPE_AT );
 140     ea->aarp_hln = sizeof( ea->aarp_sha );
 141     ea->aarp_pln = sizeof( ea->aarp_spu );
 142     ea->aarp_op = htons( AARPOP_REQUEST );
 143     bcopy(ac->ac_enaddr, ea->aarp_sha, sizeof ea->aarp_sha);
 144
 145     /*
 146      * We need to check whether the output ethernet type should
 147      * be phase 1 or 2. We have the interface that we'll be sending
 148      * the aarp out. We need to find an AppleTalk network on that
 149      * interface with the same address as we're looking for. If the
 150      * net is phase 2, generate an 802.2 and SNAP header.
 151      */
 152     if ((aa = at_ifawithnet( sat )) == NULL) {
 153         m_freem( m );
 154         return;
 155     }
 156
 157     eh = (struct ether_header *)sa.sa_data;
 158
 159     if ( aa->aa_flags & AFA_PHASE2 ) {
 160         bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
 161                 sizeof( eh->ether_dhost ));
 162         eh->ether_type = htons(sizeof(struct llc) + sizeof(struct ether_aarp));
 163         M_PREPEND( m, sizeof( struct llc ), MB_WAIT );
 164         llc = mtod( m, struct llc *);
 165         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 166         llc->llc_control = LLC_UI;
 167         bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
 168         llc->llc_ether_type = htons( ETHERTYPE_AARP );
 169
 170         bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
 171                sizeof( ea->aarp_spnet ));
 172         bcopy( &sat->sat_addr.s_net, ea->aarp_tpnet,
 173                sizeof( ea->aarp_tpnet ));
 174         ea->aarp_spnode = AA_SAT( aa )->sat_addr.s_node;
 175         ea->aarp_tpnode = sat->sat_addr.s_node;
 176     } else {
 177         bcopy(ac->ac_if.if_broadcastaddr, eh->ether_dhost,
 178               ac->ac_if.if_addrlen);
 179         eh->ether_type = htons( ETHERTYPE_AARP );
 180
 181         ea->aarp_spa = AA_SAT( aa )->sat_addr.s_node;
 182         ea->aarp_tpa = sat->sat_addr.s_node;
 183     }
 184
 185 #ifdef NETATALKDEBUG
 186     kprintf("aarp: sending request for %u.%u\n",
 187            ntohs(AA_SAT( aa )->sat_addr.s_net),
 188            AA_SAT( aa )->sat_addr.s_node);
 189 #endif /* NETATALKDEBUG */
 190
 191     sa.sa_len = sizeof( struct sockaddr );
 192     sa.sa_family = AF_UNSPEC;
 193     lwkt_serialize_enter(ac->ac_if.if_serializer);
 194     (*ac->ac_if.if_output)(&ac->ac_if,
 195         m, &sa, NULL);  /* XXX NULL should be routing information */
 196     lwkt_serialize_exit(ac->ac_if.if_serializer);
 197 }
 198
 199 int
 200 aarpresolve(struct arpcom *ac, struct mbuf *m, struct sockaddr_at *destsat,
 201             u_char *desten )
 202 {
 203     struct at_ifaddr    *aa;
 204     struct aarptab      *aat;
 205
 206     if (at_broadcast(destsat)) {
 207         m->m_flags |= M_BCAST;
 208         if ((aa = at_ifawithnet(destsat)) == NULL)  {
 209             m_freem(m);
 210             return (0);
 211         }
 212         if (aa->aa_flags & AFA_PHASE2)
 213             bcopy(atmulticastaddr, desten, sizeof atmulticastaddr);
 214         else
 215             bcopy(ac->ac_if.if_broadcastaddr, desten, ac->ac_if.if_addrlen);
 216         return (1);
 217     }
 218
 219     crit_enter();
 220     AARPTAB_LOOK( aat, destsat->sat_addr );
 221     if (aat == NULL) {                  /* No entry */
 222         aat = aarptnew( &destsat->sat_addr );
 223         if (aat == NULL) {
 224             panic("aarpresolve: no free entry");
 225         }
 226         aat->aat_hold = m;
 227         aarpwhohas(ac, destsat);
 228         crit_exit();
 229         return (0);
 230     }
 231     /* found an entry */
 232     aat->aat_timer = 0;
 233     if (aat->aat_flags & ATF_COM) {     /* entry is COMplete */
 234         bcopy(aat->aat_enaddr, desten, sizeof aat->aat_enaddr);
 235         crit_exit();
 236         return (1);
 237     }
 238     /* entry has not completed */
 239     if (aat->aat_hold) {
 240         m_freem(aat->aat_hold);
 241     }
 242     aat->aat_hold = m;
 243     aarpwhohas(ac, destsat);
 244     crit_exit();
 245     return (0);
 246 }
 247
 248 void
 249 aarpintr(struct netmsg *msg)
 250 {
 251     struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
 252     struct arphdr       *ar;
 253     struct arpcom       *ac;
 254
 255     ac = (struct arpcom *)m->m_pkthdr.rcvif;
 256     if ( ac->ac_if.if_flags & IFF_NOARP )
 257         goto out;
 258
 259     if ( m->m_len < sizeof( struct arphdr )) {
 260         goto out;
 261     }
 262
 263     ar = mtod( m, struct arphdr *);
 264     if ( ntohs( ar->ar_hrd ) != AARPHRD_ETHER ) {
 265         goto out;
 266     }
 267
 268     if ( m->m_len < sizeof( struct arphdr ) + 2 * ar->ar_hln +
 269             2 * ar->ar_pln ) {
 270         goto out;
 271     }
 272
 273     switch( ntohs( ar->ar_pro )) {
 274     case ETHERTYPE_AT :
 275         at_aarpinput( ac, m );
 276         goto out2;
 277
 278     default:
 279         break;
 280     }
 281
 282 out:
 283     m_freem(m);
 284 out2:
 285     ;
 286     /* msg was embedded in the mbuf, do not reply! */
 287 }
 288
 289 static void
 290 at_aarpinput( struct arpcom *ac, struct mbuf *m)
 291 {
 292     struct ether_aarp   *ea;
 293     struct at_ifaddr    *aa = NULL;
 294     struct aarptab      *aat;
 295     struct ether_header *eh;
 296     struct llc          *llc;
 297     struct sockaddr_at  sat;
 298     struct sockaddr     sa;
 299     struct at_addr      spa, tpa, ma;
 300     int                 op;
 301     u_short             net;
 302
 303     ea = mtod( m, struct ether_aarp *);
 304
 305     /* Check to see if from my hardware address */
 306     if ( !bcmp(( caddr_t )ea->aarp_sha, ( caddr_t )ac->ac_enaddr,
 307             sizeof( ac->ac_enaddr ))) {
 308         m_freem( m );
 309         return;
 310     }
 311
 312     op = ntohs(ea->aarp_op);
 313     bcopy(ea->aarp_tpnet, &net, sizeof net);
 314
 315     if ( net != 0 ) { /* should be ATADDR_ANYNET? */
 316         sat.sat_len = sizeof(struct sockaddr_at);
 317         sat.sat_family = AF_APPLETALK;
 318         sat.sat_addr.s_net = net;
 319         if ((aa = at_ifawithnet(&sat)) == NULL) {
 320             m_freem( m );
 321             return;
 322         }
 323         bcopy(ea->aarp_spnet, &spa.s_net, sizeof spa.s_net);
 324         bcopy(ea->aarp_tpnet, &tpa.s_net, sizeof tpa.s_net);
 325     } else {
 326         struct ifaddr_container *ifac;
 327
 328         /*
 329          * Since we don't know the net, we just look for the first
 330          * phase 1 address on the interface.
 331          */
 332         TAILQ_FOREACH(ifac, &ac->ac_if.if_addrheads[mycpuid], ifa_link) {
 333             aa = (struct at_ifaddr *)(ifac->ifa);
 334             if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
 335                     ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
 336                 break;
 337             }
 338         }
 339         if ( aa == NULL ) {
 340             m_freem( m );
 341             return;
 342         }
 343         tpa.s_net = spa.s_net = AA_SAT( aa )->sat_addr.s_net;
 344     }
 345
 346     spa.s_node = ea->aarp_spnode;
 347     tpa.s_node = ea->aarp_tpnode;
 348     ma.s_net = AA_SAT( aa )->sat_addr.s_net;
 349     ma.s_node = AA_SAT( aa )->sat_addr.s_node;
 350
 351     /*
 352      * This looks like it's from us.
 353      */
 354     if ( spa.s_net == ma.s_net && spa.s_node == ma.s_node ) {
 355         if ( aa->aa_flags & AFA_PROBING ) {
 356             /*
 357              * We're probing, someone either responded to our probe, or
 358              * probed for the same address we'd like to use. Change the
 359              * address we're probing for.
 360              */
 361             callout_stop(&aa->aa_ch);
 362             wakeup( aa );
 363             m_freem( m );
 364             return;
 365         } else if ( op != AARPOP_PROBE ) {
 366             /*
 367              * This is not a probe, and we're not probing. This means
 368              * that someone's saying they have the same source address
 369              * as the one we're using. Get upset...
 370              */
 371             log( LOG_ERR,
 372                     "aarp: duplicate AT address!! %x:%x:%x:%x:%x:%x\n",
 373                     ea->aarp_sha[ 0 ], ea->aarp_sha[ 1 ], ea->aarp_sha[ 2 ],
 374                     ea->aarp_sha[ 3 ], ea->aarp_sha[ 4 ], ea->aarp_sha[ 5 ]);
 375             m_freem( m );
 376             return;
 377         }
 378     }
 379
 380     AARPTAB_LOOK( aat, spa );
 381     if ( aat ) {
 382         if ( op == AARPOP_PROBE ) {
 383             /*
 384              * Someone's probing for spa, dealocate the one we've got,
 385              * so that if the prober keeps the address, we'll be able
 386              * to arp for him.
 387              */
 388             aarptfree( aat );
 389             m_freem( m );
 390             return;
 391         }
 392
 393         bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
 394                 sizeof( ea->aarp_sha ));
 395         aat->aat_flags |= ATF_COM;
 396         if ( aat->aat_hold ) {
 397             struct mbuf *mhold = aat->aat_hold;
 398             aat->aat_hold = NULL;
 399             sat.sat_len = sizeof(struct sockaddr_at);
 400             sat.sat_family = AF_APPLETALK;
 401             sat.sat_addr = spa;
 402             lwkt_serialize_enter(ac->ac_if.if_serializer);
 403             (*ac->ac_if.if_output)( &ac->ac_if, mhold,
 404                     (struct sockaddr *)&sat, NULL); /* XXX */
 405             lwkt_serialize_exit(ac->ac_if.if_serializer);
 406         }
 407     } else if ((tpa.s_net == ma.s_net)
 408            && (tpa.s_node == ma.s_node)
 409            && (op != AARPOP_PROBE)
 410            && ((aat = aarptnew( &spa )) != NULL)) {
 411                 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
 412                     sizeof( ea->aarp_sha ));
 413                 aat->aat_flags |= ATF_COM;
 414     }
 415
 416     /*
 417      * Don't respond to responses, and never respond if we're
 418      * still probing.
 419      */
 420     if ( tpa.s_net != ma.s_net || tpa.s_node != ma.s_node ||
 421             op == AARPOP_RESPONSE || ( aa->aa_flags & AFA_PROBING )) {
 422         m_freem( m );
 423         return;
 424     }
 425
 426     bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )ea->aarp_tha,
 427             sizeof( ea->aarp_sha ));
 428     bcopy(( caddr_t )ac->ac_enaddr, ( caddr_t )ea->aarp_sha,
 429             sizeof( ea->aarp_sha ));
 430
 431     /* XXX */
 432     eh = (struct ether_header *)sa.sa_data;
 433     bcopy(( caddr_t )ea->aarp_tha, ( caddr_t )eh->ether_dhost,
 434             sizeof( eh->ether_dhost ));
 435
 436     if ( aa->aa_flags & AFA_PHASE2 ) {
 437         eh->ether_type = htons( sizeof( struct llc ) +
 438                 sizeof( struct ether_aarp ));
 439         M_PREPEND( m, sizeof( struct llc ), MB_DONTWAIT );
 440         if ( m == NULL ) {
 441             return;
 442         }
 443         llc = mtod( m, struct llc *);
 444         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 445         llc->llc_control = LLC_UI;
 446         bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
 447         llc->llc_ether_type = htons( ETHERTYPE_AARP );
 448
 449         bcopy( ea->aarp_spnet, ea->aarp_tpnet, sizeof( ea->aarp_tpnet ));
 450         bcopy( &ma.s_net, ea->aarp_spnet, sizeof( ea->aarp_spnet ));
 451     } else {
 452         eh->ether_type = htons( ETHERTYPE_AARP );
 453     }
 454
 455     ea->aarp_tpnode = ea->aarp_spnode;
 456     ea->aarp_spnode = ma.s_node;
 457     ea->aarp_op = htons( AARPOP_RESPONSE );
 458
 459     sa.sa_len = sizeof( struct sockaddr );
 460     sa.sa_family = AF_UNSPEC;
 461     lwkt_serialize_enter(ac->ac_if.if_serializer);
 462     (*ac->ac_if.if_output)( &ac->ac_if, m, &sa, NULL); /* XXX */
 463     lwkt_serialize_exit(ac->ac_if.if_serializer);
 464     return;
 465 }
 466
 467 static void
 468 aarptfree(struct aarptab *aat)
 469 {
 470
 471     if ( aat->aat_hold )
 472         m_freem( aat->aat_hold );
 473     aat->aat_hold = NULL;
 474     aat->aat_timer = aat->aat_flags = 0;
 475     aat->aat_ataddr.s_net = 0;
 476     aat->aat_ataddr.s_node = 0;
 477 }
 478
 479 struct aarptab *
 480 aarptnew(struct at_addr *addr)
 481 {
 482     int                 n;
 483     int                 oldest = -1;
 484     struct aarptab      *aat, *aato = NULL;
 485     static int          first = 1;
 486
 487     if ( first ) {
 488         first = 0;
 489         callout_init(&aarptimer_ch);
 490         callout_reset(&aarptimer_ch, hz, aarptimer, NULL);
 491     }
 492     aat = &aarptab[ AARPTAB_HASH( *addr ) * AARPTAB_BSIZ ];
 493     for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) {
 494         if ( aat->aat_flags == 0 )
 495             goto out;
 496         if ( aat->aat_flags & ATF_PERM )
 497             continue;
 498         if ((int) aat->aat_timer > oldest ) {
 499             oldest = aat->aat_timer;
 500             aato = aat;
 501         }
 502     }
 503     if ( aato == NULL )
 504         return( NULL );
 505     aat = aato;
 506     aarptfree( aat );
 507 out:
 508     aat->aat_ataddr = *addr;
 509     aat->aat_flags = ATF_INUSE;
 510     return( aat );
 511 }
 512
 513
 514 void
 515 aarpprobe(void *arg)
 516 {
 517     struct arpcom       *ac = arg;
 518     struct mbuf         *m;
 519     struct ether_header *eh;
 520     struct ether_aarp   *ea;
 521     struct ifaddr_container *ifac;
 522     struct at_ifaddr    *aa = NULL;
 523     struct llc          *llc;
 524     struct sockaddr     sa;
 525
 526     /*
 527      * We need to check whether the output ethernet type should
 528      * be phase 1 or 2. We have the interface that we'll be sending
 529      * the aarp out. We need to find an AppleTalk network on that
 530      * interface with the same address as we're looking for. If the
 531      * net is phase 2, generate an 802.2 and SNAP header.
 532      */
 533     TAILQ_FOREACH(ifac, &ac->ac_if.if_addrheads[mycpuid], ifa_link) {
 534         aa = (struct at_ifaddr *)(ifac->ifa);
 535         if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
 536                 ( aa->aa_flags & AFA_PROBING )) {
 537             break;
 538         }
 539     }
 540     if ( aa == NULL ) {         /* serious error XXX */
 541         kprintf( "aarpprobe why did this happen?!\n" );
 542         return;
 543     }
 544
 545     if ( aa->aa_probcnt <= 0 ) {
 546         aa->aa_flags &= ~AFA_PROBING;
 547         wakeup( aa );
 548         return;
 549     } else {
 550         callout_reset(&aa->aa_ch, hz / 5, aarpprobe, ac);
 551     }
 552
 553     if (( m = m_gethdr( MB_DONTWAIT, MT_DATA )) == NULL ) {
 554         return;
 555     }
 556     m->m_len = sizeof( *ea );
 557     m->m_pkthdr.len = sizeof( *ea );
 558     MH_ALIGN( m, sizeof( *ea ));
 559
 560     ea = mtod( m, struct ether_aarp *);
 561     bzero((caddr_t)ea, sizeof( *ea ));
 562
 563     ea->aarp_hrd = htons( AARPHRD_ETHER );
 564     ea->aarp_pro = htons( ETHERTYPE_AT );
 565     ea->aarp_hln = sizeof( ea->aarp_sha );
 566     ea->aarp_pln = sizeof( ea->aarp_spu );
 567     ea->aarp_op = htons( AARPOP_PROBE );
 568     bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
 569             sizeof( ea->aarp_sha ));
 570
 571     eh = (struct ether_header *)sa.sa_data;
 572
 573     if ( aa->aa_flags & AFA_PHASE2 ) {
 574         bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
 575                 sizeof( eh->ether_dhost ));
 576         eh->ether_type = htons( sizeof( struct llc ) +
 577                 sizeof( struct ether_aarp ));
 578         M_PREPEND( m, sizeof( struct llc ), MB_WAIT );
 579         /* XXX-MBUF */
 580         llc = mtod( m, struct llc *);
 581         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 582         llc->llc_control = LLC_UI;
 583         bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
 584         llc->llc_ether_type = htons( ETHERTYPE_AARP );
 585
 586         bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
 587                 sizeof( ea->aarp_spnet ));
 588         bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_tpnet,
 589                 sizeof( ea->aarp_tpnet ));
 590         ea->aarp_spnode = ea->aarp_tpnode = AA_SAT( aa )->sat_addr.s_node;
 591     } else {
 592         bcopy(ac->ac_if.if_broadcastaddr, eh->ether_dhost,
 593               ac->ac_if.if_addrlen);
 594         eh->ether_type = htons( ETHERTYPE_AARP );
 595         ea->aarp_spa = ea->aarp_tpa = AA_SAT( aa )->sat_addr.s_node;
 596     }
 597
 598 #ifdef NETATALKDEBUG
 599     kprintf("aarp: sending probe for %u.%u\n",
 600            ntohs(AA_SAT( aa )->sat_addr.s_net),
 601            AA_SAT( aa )->sat_addr.s_node);
 602 #endif /* NETATALKDEBUG */
 603
 604     sa.sa_len = sizeof( struct sockaddr );
 605     sa.sa_family = AF_UNSPEC;
 606     lwkt_serialize_enter(ac->ac_if.if_serializer);
 607     (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, NULL); /* XXX */
 608     lwkt_serialize_exit(ac->ac_if.if_serializer);
 609     aa->aa_probcnt--;
 610 }
 611
 612 void
 613 aarp_clean(void)
 614 {
 615     struct aarptab      *aat;
 616     int                 i;
 617
 618     callout_stop(&aarptimer_ch);
 619     for ( i = 0, aat = aarptab; i < AARPTAB_SIZE; i++, aat++ ) {
 620         if ( aat->aat_hold ) {
 621             m_freem( aat->aat_hold );
 622             aat->aat_hold = NULL;
 623         }
 624     }
 625 }