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 1.23 2008/04/05 07:57:22 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     (*ac->ac_if.if_output)(&ac->ac_if,
 194         m, &sa, NULL);  /* XXX NULL should be routing information */
 195 }
 196
 197 int
 198 aarpresolve(struct arpcom *ac, struct mbuf *m, struct sockaddr_at *destsat,
 199             u_char *desten )
 200 {
 201     struct at_ifaddr    *aa;
 202     struct aarptab      *aat;
 203
 204     if (at_broadcast(destsat)) {
 205         m->m_flags |= M_BCAST;
 206         if ((aa = at_ifawithnet(destsat)) == NULL)  {
 207             m_freem(m);
 208             return (0);
 209         }
 210         if (aa->aa_flags & AFA_PHASE2)
 211             bcopy(atmulticastaddr, desten, sizeof atmulticastaddr);
 212         else
 213             bcopy(ac->ac_if.if_broadcastaddr, desten, ac->ac_if.if_addrlen);
 214         return (1);
 215     }
 216
 217     crit_enter();
 218     AARPTAB_LOOK( aat, destsat->sat_addr );
 219     if (aat == NULL) {                  /* No entry */
 220         aat = aarptnew( &destsat->sat_addr );
 221         if (aat == NULL) {
 222             panic("aarpresolve: no free entry");
 223         }
 224         aat->aat_hold = m;
 225         aarpwhohas(ac, destsat);
 226         crit_exit();
 227         return (0);
 228     }
 229     /* found an entry */
 230     aat->aat_timer = 0;
 231     if (aat->aat_flags & ATF_COM) {     /* entry is COMplete */
 232         bcopy(aat->aat_enaddr, desten, sizeof aat->aat_enaddr);
 233         crit_exit();
 234         return (1);
 235     }
 236     /* entry has not completed */
 237     if (aat->aat_hold) {
 238         m_freem(aat->aat_hold);
 239     }
 240     aat->aat_hold = m;
 241     aarpwhohas(ac, destsat);
 242     crit_exit();
 243     return (0);
 244 }
 245
 246 void
 247 aarpintr(struct netmsg *msg)
 248 {
 249     struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
 250     struct arphdr       *ar;
 251     struct arpcom       *ac;
 252
 253     ac = (struct arpcom *)m->m_pkthdr.rcvif;
 254     if ( ac->ac_if.if_flags & IFF_NOARP )
 255         goto out;
 256
 257     if ( m->m_len < sizeof( struct arphdr )) {
 258         goto out;
 259     }
 260
 261     ar = mtod( m, struct arphdr *);
 262     if ( ntohs( ar->ar_hrd ) != AARPHRD_ETHER ) {
 263         goto out;
 264     }
 265
 266     if ( m->m_len < sizeof( struct arphdr ) + 2 * ar->ar_hln +
 267             2 * ar->ar_pln ) {
 268         goto out;
 269     }
 270
 271     switch( ntohs( ar->ar_pro )) {
 272     case ETHERTYPE_AT :
 273         at_aarpinput( ac, m );
 274         goto out2;
 275
 276     default:
 277         break;
 278     }
 279
 280 out:
 281     m_freem(m);
 282 out2:
 283     ;
 284     /* msg was embedded in the mbuf, do not reply! */
 285 }
 286
 287 static void
 288 at_aarpinput( struct arpcom *ac, struct mbuf *m)
 289 {
 290     struct ether_aarp   *ea;
 291     struct at_ifaddr    *aa = NULL;
 292     struct aarptab      *aat;
 293     struct ether_header *eh;
 294     struct llc          *llc;
 295     struct sockaddr_at  sat;
 296     struct sockaddr     sa;
 297     struct at_addr      spa, tpa, ma;
 298     int                 op;
 299     u_short             net;
 300
 301     ea = mtod( m, struct ether_aarp *);
 302
 303     /* Check to see if from my hardware address */
 304     if ( !bcmp(( caddr_t )ea->aarp_sha, ( caddr_t )ac->ac_enaddr,
 305             sizeof( ac->ac_enaddr ))) {
 306         m_freem( m );
 307         return;
 308     }
 309
 310     op = ntohs(ea->aarp_op);
 311     bcopy(ea->aarp_tpnet, &net, sizeof net);
 312
 313     if ( net != 0 ) { /* should be ATADDR_ANYNET? */
 314         sat.sat_len = sizeof(struct sockaddr_at);
 315         sat.sat_family = AF_APPLETALK;
 316         sat.sat_addr.s_net = net;
 317         if ((aa = at_ifawithnet(&sat)) == NULL) {
 318             m_freem( m );
 319             return;
 320         }
 321         bcopy(ea->aarp_spnet, &spa.s_net, sizeof spa.s_net);
 322         bcopy(ea->aarp_tpnet, &tpa.s_net, sizeof tpa.s_net);
 323     } else {
 324         struct ifaddr_container *ifac;
 325
 326         /*
 327          * Since we don't know the net, we just look for the first
 328          * phase 1 address on the interface.
 329          */
 330         TAILQ_FOREACH(ifac, &ac->ac_if.if_addrheads[mycpuid], ifa_link) {
 331             aa = (struct at_ifaddr *)(ifac->ifa);
 332             if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
 333                     ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
 334                 break;
 335             }
 336         }
 337         if ( aa == NULL ) {
 338             m_freem( m );
 339             return;
 340         }
 341         tpa.s_net = spa.s_net = AA_SAT( aa )->sat_addr.s_net;
 342     }
 343
 344     spa.s_node = ea->aarp_spnode;
 345     tpa.s_node = ea->aarp_tpnode;
 346     ma.s_net = AA_SAT( aa )->sat_addr.s_net;
 347     ma.s_node = AA_SAT( aa )->sat_addr.s_node;
 348
 349     /*
 350      * This looks like it's from us.
 351      */
 352     if ( spa.s_net == ma.s_net && spa.s_node == ma.s_node ) {
 353         if ( aa->aa_flags & AFA_PROBING ) {
 354             /*
 355              * We're probing, someone either responded to our probe, or
 356              * probed for the same address we'd like to use. Change the
 357              * address we're probing for.
 358              */
 359             callout_stop(&aa->aa_ch);
 360             wakeup( aa );
 361             m_freem( m );
 362             return;
 363         } else if ( op != AARPOP_PROBE ) {
 364             /*
 365              * This is not a probe, and we're not probing. This means
 366              * that someone's saying they have the same source address
 367              * as the one we're using. Get upset...
 368              */
 369             log( LOG_ERR,
 370                     "aarp: duplicate AT address!! %x:%x:%x:%x:%x:%x\n",
 371                     ea->aarp_sha[ 0 ], ea->aarp_sha[ 1 ], ea->aarp_sha[ 2 ],
 372                     ea->aarp_sha[ 3 ], ea->aarp_sha[ 4 ], ea->aarp_sha[ 5 ]);
 373             m_freem( m );
 374             return;
 375         }
 376     }
 377
 378     AARPTAB_LOOK( aat, spa );
 379     if ( aat ) {
 380         if ( op == AARPOP_PROBE ) {
 381             /*
 382              * Someone's probing for spa, dealocate the one we've got,
 383              * so that if the prober keeps the address, we'll be able
 384              * to arp for him.
 385              */
 386             aarptfree( aat );
 387             m_freem( m );
 388             return;
 389         }
 390
 391         bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
 392                 sizeof( ea->aarp_sha ));
 393         aat->aat_flags |= ATF_COM;
 394         if ( aat->aat_hold ) {
 395             struct mbuf *mhold = aat->aat_hold;
 396             aat->aat_hold = NULL;
 397             sat.sat_len = sizeof(struct sockaddr_at);
 398             sat.sat_family = AF_APPLETALK;
 399             sat.sat_addr = spa;
 400             lwkt_serialize_enter(ac->ac_if.if_serializer);
 401             (*ac->ac_if.if_output)( &ac->ac_if, mhold,
 402                     (struct sockaddr *)&sat, NULL); /* XXX */
 403             lwkt_serialize_exit(ac->ac_if.if_serializer);
 404         }
 405     } else if ((tpa.s_net == ma.s_net)
 406            && (tpa.s_node == ma.s_node)
 407            && (op != AARPOP_PROBE)
 408            && ((aat = aarptnew( &spa )) != NULL)) {
 409                 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
 410                     sizeof( ea->aarp_sha ));
 411                 aat->aat_flags |= ATF_COM;
 412     }
 413
 414     /*
 415      * Don't respond to responses, and never respond if we're
 416      * still probing.
 417      */
 418     if ( tpa.s_net != ma.s_net || tpa.s_node != ma.s_node ||
 419             op == AARPOP_RESPONSE || ( aa->aa_flags & AFA_PROBING )) {
 420         m_freem( m );
 421         return;
 422     }
 423
 424     bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )ea->aarp_tha,
 425             sizeof( ea->aarp_sha ));
 426     bcopy(( caddr_t )ac->ac_enaddr, ( caddr_t )ea->aarp_sha,
 427             sizeof( ea->aarp_sha ));
 428
 429     /* XXX */
 430     eh = (struct ether_header *)sa.sa_data;
 431     bcopy(( caddr_t )ea->aarp_tha, ( caddr_t )eh->ether_dhost,
 432             sizeof( eh->ether_dhost ));
 433
 434     if ( aa->aa_flags & AFA_PHASE2 ) {
 435         eh->ether_type = htons( sizeof( struct llc ) +
 436                 sizeof( struct ether_aarp ));
 437         M_PREPEND( m, sizeof( struct llc ), MB_DONTWAIT );
 438         if ( m == NULL ) {
 439             return;
 440         }
 441         llc = mtod( m, struct llc *);
 442         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 443         llc->llc_control = LLC_UI;
 444         bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
 445         llc->llc_ether_type = htons( ETHERTYPE_AARP );
 446
 447         bcopy( ea->aarp_spnet, ea->aarp_tpnet, sizeof( ea->aarp_tpnet ));
 448         bcopy( &ma.s_net, ea->aarp_spnet, sizeof( ea->aarp_spnet ));
 449     } else {
 450         eh->ether_type = htons( ETHERTYPE_AARP );
 451     }
 452
 453     ea->aarp_tpnode = ea->aarp_spnode;
 454     ea->aarp_spnode = ma.s_node;
 455     ea->aarp_op = htons( AARPOP_RESPONSE );
 456
 457     sa.sa_len = sizeof( struct sockaddr );
 458     sa.sa_family = AF_UNSPEC;
 459     lwkt_serialize_enter(ac->ac_if.if_serializer);
 460     (*ac->ac_if.if_output)( &ac->ac_if, m, &sa, NULL); /* XXX */
 461     lwkt_serialize_exit(ac->ac_if.if_serializer);
 462     return;
 463 }
 464
 465 static void
 466 aarptfree(struct aarptab *aat)
 467 {
 468
 469     if ( aat->aat_hold )
 470         m_freem( aat->aat_hold );
 471     aat->aat_hold = NULL;
 472     aat->aat_timer = aat->aat_flags = 0;
 473     aat->aat_ataddr.s_net = 0;
 474     aat->aat_ataddr.s_node = 0;
 475 }
 476
 477 struct aarptab *
 478 aarptnew(struct at_addr *addr)
 479 {
 480     int                 n;
 481     int                 oldest = -1;
 482     struct aarptab      *aat, *aato = NULL;
 483     static int          first = 1;
 484
 485     if ( first ) {
 486         first = 0;
 487         callout_init(&aarptimer_ch);
 488         callout_reset(&aarptimer_ch, hz, aarptimer, NULL);
 489     }
 490     aat = &aarptab[ AARPTAB_HASH( *addr ) * AARPTAB_BSIZ ];
 491     for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) {
 492         if ( aat->aat_flags == 0 )
 493             goto out;
 494         if ( aat->aat_flags & ATF_PERM )
 495             continue;
 496         if ((int) aat->aat_timer > oldest ) {
 497             oldest = aat->aat_timer;
 498             aato = aat;
 499         }
 500     }
 501     if ( aato == NULL )
 502         return( NULL );
 503     aat = aato;
 504     aarptfree( aat );
 505 out:
 506     aat->aat_ataddr = *addr;
 507     aat->aat_flags = ATF_INUSE;
 508     return( aat );
 509 }
 510
 511
 512 void
 513 aarpprobe(void *arg)
 514 {
 515     struct arpcom       *ac = arg;
 516     struct mbuf         *m;
 517     struct ether_header *eh;
 518     struct ether_aarp   *ea;
 519     struct ifaddr_container *ifac;
 520     struct at_ifaddr    *aa = NULL;
 521     struct llc          *llc;
 522     struct sockaddr     sa;
 523
 524     /*
 525      * We need to check whether the output ethernet type should
 526      * be phase 1 or 2. We have the interface that we'll be sending
 527      * the aarp out. We need to find an AppleTalk network on that
 528      * interface with the same address as we're looking for. If the
 529      * net is phase 2, generate an 802.2 and SNAP header.
 530      */
 531     TAILQ_FOREACH(ifac, &ac->ac_if.if_addrheads[mycpuid], ifa_link) {
 532         aa = (struct at_ifaddr *)(ifac->ifa);
 533         if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
 534                 ( aa->aa_flags & AFA_PROBING )) {
 535             break;
 536         }
 537     }
 538     if ( aa == NULL ) {         /* serious error XXX */
 539         kprintf( "aarpprobe why did this happen?!\n" );
 540         return;
 541     }
 542
 543     if ( aa->aa_probcnt <= 0 ) {
 544         aa->aa_flags &= ~AFA_PROBING;
 545         wakeup( aa );
 546         return;
 547     } else {
 548         callout_reset(&aa->aa_ch, hz / 5, aarpprobe, ac);
 549     }
 550
 551     if (( m = m_gethdr( MB_DONTWAIT, MT_DATA )) == NULL ) {
 552         return;
 553     }
 554     m->m_len = sizeof( *ea );
 555     m->m_pkthdr.len = sizeof( *ea );
 556     MH_ALIGN( m, sizeof( *ea ));
 557
 558     ea = mtod( m, struct ether_aarp *);
 559     bzero((caddr_t)ea, sizeof( *ea ));
 560
 561     ea->aarp_hrd = htons( AARPHRD_ETHER );
 562     ea->aarp_pro = htons( ETHERTYPE_AT );
 563     ea->aarp_hln = sizeof( ea->aarp_sha );
 564     ea->aarp_pln = sizeof( ea->aarp_spu );
 565     ea->aarp_op = htons( AARPOP_PROBE );
 566     bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
 567             sizeof( ea->aarp_sha ));
 568
 569     eh = (struct ether_header *)sa.sa_data;
 570
 571     if ( aa->aa_flags & AFA_PHASE2 ) {
 572         bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
 573                 sizeof( eh->ether_dhost ));
 574         eh->ether_type = htons( sizeof( struct llc ) +
 575                 sizeof( struct ether_aarp ));
 576         M_PREPEND( m, sizeof( struct llc ), MB_WAIT );
 577         /* XXX-MBUF */
 578         llc = mtod( m, struct llc *);
 579         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 580         llc->llc_control = LLC_UI;
 581         bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
 582         llc->llc_ether_type = htons( ETHERTYPE_AARP );
 583
 584         bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
 585                 sizeof( ea->aarp_spnet ));
 586         bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_tpnet,
 587                 sizeof( ea->aarp_tpnet ));
 588         ea->aarp_spnode = ea->aarp_tpnode = AA_SAT( aa )->sat_addr.s_node;
 589     } else {
 590         bcopy(ac->ac_if.if_broadcastaddr, eh->ether_dhost,
 591               ac->ac_if.if_addrlen);
 592         eh->ether_type = htons( ETHERTYPE_AARP );
 593         ea->aarp_spa = ea->aarp_tpa = AA_SAT( aa )->sat_addr.s_node;
 594     }
 595
 596 #ifdef NETATALKDEBUG
 597     kprintf("aarp: sending probe for %u.%u\n",
 598            ntohs(AA_SAT( aa )->sat_addr.s_net),
 599            AA_SAT( aa )->sat_addr.s_node);
 600 #endif /* NETATALKDEBUG */
 601
 602     sa.sa_len = sizeof( struct sockaddr );
 603     sa.sa_family = AF_UNSPEC;
 604     lwkt_serialize_enter(ac->ac_if.if_serializer);
 605     (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, NULL); /* XXX */
 606     lwkt_serialize_exit(ac->ac_if.if_serializer);
 607     aa->aa_probcnt--;
 608 }
 609
 610 void
 611 aarp_clean(void)
 612 {
 613     struct aarptab      *aat;
 614     int                 i;
 615
 616     callout_stop(&aarptimer_ch);
 617     for ( i = 0, aat = aarptab; i < AARPTAB_SIZE; i++, aat++ ) {
 618         if ( aat->aat_hold ) {
 619             m_freem( aat->aat_hold );
 620             aat->aat_hold = NULL;
 621         }
 622     }
 623 }