2 * Copyright (c) 1990,1991 Regents of The University of Michigan.
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 1.2 2003/06/17 04:28:48 dillon Exp $
11 #include <sys/param.h>
12 #include <sys/systm.h>
14 #include <sys/kernel.h>
15 #include <sys/socket.h>
16 #include <sys/syslog.h>
20 #include <netinet/in.h>
22 #include <netinet/if_ether.h>
24 #include <netatalk/at.h>
25 #include <netatalk/at_var.h>
26 #include <netatalk/aarp.h>
27 #include <netatalk/phase2.h>
28 #include <netatalk/at_extern.h>
30 static void aarptfree( struct aarptab *aat);
31 static void at_aarpinput( struct arpcom *ac, struct mbuf *m);
33 #define AARPTAB_BSIZ 9
35 #define AARPTAB_SIZE (AARPTAB_BSIZ * AARPTAB_NB)
36 static struct aarptab aarptab[AARPTAB_SIZE];
38 #define AARPTAB_HASH(a) \
39 ((((a).s_net << 8 ) + (a).s_node ) % AARPTAB_NB )
41 #define AARPTAB_LOOK(aat,addr) { \
43 aat = &aarptab[ AARPTAB_HASH(addr) * AARPTAB_BSIZ ]; \
44 for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) \
45 if ( aat->aat_ataddr.s_net == (addr).s_net && \
46 aat->aat_ataddr.s_node == (addr).s_node ) \
48 if ( n >= AARPTAB_BSIZ ) \
52 #define AARPT_AGE (60 * 1)
53 #define AARPT_KILLC 20
56 # if !defined( __FreeBSD__ )
57 extern u_char etherbroadcastaddr[6];
60 static u_char atmulticastaddr[ 6 ] = {
61 0x09, 0x00, 0x07, 0xff, 0xff, 0xff,
64 u_char at_org_code[ 3 ] = {
67 u_char aarp_org_code[ 3 ] = {
71 static struct callout_handle aarptimer_ch =
72 CALLOUT_HANDLE_INITIALIZER(&aarptimer_ch);
75 aarptimer(void *ignored)
80 aarptimer_ch = timeout( aarptimer, (caddr_t)0, AARPT_AGE * hz );
82 for ( i = 0; i < AARPTAB_SIZE; i++, aat++ ) {
83 if ( aat->aat_flags == 0 || ( aat->aat_flags & ATF_PERM ))
85 if ( ++aat->aat_timer < (( aat->aat_flags & ATF_COM ) ?
86 AARPT_KILLC : AARPT_KILLI ))
95 * search through the network addresses to find one that includes
96 * the given network.. remember to take netranges into
100 at_ifawithnet(struct sockaddr_at *sat )
102 struct at_ifaddr *aa;
103 struct sockaddr_at *sat2;
105 for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
106 sat2 = &(aa->aa_addr);
107 if ( sat2->sat_addr.s_net == sat->sat_addr.s_net ) {
110 if( (aa->aa_flags & AFA_PHASE2 )
111 && (ntohs(aa->aa_firstnet) <= ntohs(sat->sat_addr.s_net))
112 && (ntohs(aa->aa_lastnet) >= ntohs(sat->sat_addr.s_net))) {
120 aarpwhohas( struct arpcom *ac, struct sockaddr_at *sat )
123 struct ether_header *eh;
124 struct ether_aarp *ea;
125 struct at_ifaddr *aa;
129 if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
132 m->m_len = sizeof( *ea );
133 m->m_pkthdr.len = sizeof( *ea );
134 MH_ALIGN( m, sizeof( *ea ));
136 ea = mtod( m, struct ether_aarp *);
137 bzero((caddr_t)ea, sizeof( *ea ));
139 ea->aarp_hrd = htons( AARPHRD_ETHER );
140 ea->aarp_pro = htons( ETHERTYPE_AT );
141 ea->aarp_hln = sizeof( ea->aarp_sha );
142 ea->aarp_pln = sizeof( ea->aarp_spu );
143 ea->aarp_op = htons( AARPOP_REQUEST );
144 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
145 sizeof( ea->aarp_sha ));
148 * We need to check whether the output ethernet type should
149 * be phase 1 or 2. We have the interface that we'll be sending
150 * the aarp out. We need to find an AppleTalk network on that
151 * interface with the same address as we're looking for. If the
152 * net is phase 2, generate an 802.2 and SNAP header.
154 if ((aa = at_ifawithnet( sat )) == NULL) {
159 eh = (struct ether_header *)sa.sa_data;
161 if ( aa->aa_flags & AFA_PHASE2 ) {
162 bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
163 sizeof( eh->ether_dhost ));
164 eh->ether_type = htons(sizeof(struct llc) + sizeof(struct ether_aarp));
165 M_PREPEND( m, sizeof( struct llc ), M_WAIT );
166 llc = mtod( m, struct llc *);
167 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
168 llc->llc_control = LLC_UI;
169 bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
170 llc->llc_ether_type = htons( ETHERTYPE_AARP );
172 bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
173 sizeof( ea->aarp_spnet ));
174 bcopy( &sat->sat_addr.s_net, ea->aarp_tpnet,
175 sizeof( ea->aarp_tpnet ));
176 ea->aarp_spnode = AA_SAT( aa )->sat_addr.s_node;
177 ea->aarp_tpnode = sat->sat_addr.s_node;
179 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
180 sizeof( eh->ether_dhost ));
181 eh->ether_type = htons( ETHERTYPE_AARP );
183 ea->aarp_spa = AA_SAT( aa )->sat_addr.s_node;
184 ea->aarp_tpa = sat->sat_addr.s_node;
188 printf("aarp: sending request for %u.%u\n",
189 ntohs(AA_SAT( aa )->sat_addr.s_net),
190 AA_SAT( aa )->sat_addr.s_node);
191 #endif /* NETATALKDEBUG */
193 sa.sa_len = sizeof( struct sockaddr );
194 sa.sa_family = AF_UNSPEC;
195 (*ac->ac_if.if_output)(&ac->ac_if,
196 m, &sa, NULL); /* XXX NULL should be routing information */
200 aarpresolve( ac, m, destsat, desten )
203 struct sockaddr_at *destsat;
206 struct at_ifaddr *aa;
210 if ( at_broadcast( destsat )) {
211 m->m_flags |= M_BCAST;
212 if ((aa = at_ifawithnet( destsat )) == NULL) {
216 if ( aa->aa_flags & AFA_PHASE2 ) {
217 bcopy( (caddr_t)atmulticastaddr, (caddr_t)desten,
218 sizeof( atmulticastaddr ));
220 bcopy( (caddr_t)etherbroadcastaddr, (caddr_t)desten,
221 sizeof( etherbroadcastaddr ));
227 AARPTAB_LOOK( aat, destsat->sat_addr );
228 if ( aat == 0 ) { /* No entry */
229 aat = aarptnew( &destsat->sat_addr );
231 panic( "aarpresolve: no free entry" );
234 aarpwhohas( ac, destsat );
240 if ( aat->aat_flags & ATF_COM ) { /* entry is COMplete */
241 bcopy( (caddr_t)aat->aat_enaddr, (caddr_t)desten,
242 sizeof( aat->aat_enaddr ));
246 /* entry has not completed */
247 if ( aat->aat_hold ) {
248 m_freem( aat->aat_hold );
251 aarpwhohas( ac, destsat );
263 if ( ac->ac_if.if_flags & IFF_NOARP )
266 if ( m->m_len < sizeof( struct arphdr )) {
270 ar = mtod( m, struct arphdr *);
271 if ( ntohs( ar->ar_hrd ) != AARPHRD_ETHER ) {
275 if ( m->m_len < sizeof( struct arphdr ) + 2 * ar->ar_hln +
280 switch( ntohs( ar->ar_pro )) {
282 at_aarpinput( ac, m );
294 at_aarpinput( struct arpcom *ac, struct mbuf *m)
296 struct ether_aarp *ea;
297 struct at_ifaddr *aa;
299 struct ether_header *eh;
301 struct sockaddr_at sat;
303 struct at_addr spa, tpa, ma;
307 ea = mtod( m, struct ether_aarp *);
309 /* Check to see if from my hardware address */
310 if ( !bcmp(( caddr_t )ea->aarp_sha, ( caddr_t )ac->ac_enaddr,
311 sizeof( ac->ac_enaddr ))) {
316 op = ntohs( ea->aarp_op );
317 bcopy( ea->aarp_tpnet, &net, sizeof( net ));
319 if ( net != 0 ) { /* should be ATADDR_ANYNET? */
320 sat.sat_len = sizeof(struct sockaddr_at);
321 sat.sat_family = AF_APPLETALK;
322 sat.sat_addr.s_net = net;
323 if ((aa = at_ifawithnet( &sat )) == NULL) {
327 bcopy( ea->aarp_spnet, &spa.s_net, sizeof( spa.s_net ));
328 bcopy( ea->aarp_tpnet, &tpa.s_net, sizeof( tpa.s_net ));
331 * Since we don't know the net, we just look for the first
332 * phase 1 address on the interface.
334 for (aa = (struct at_ifaddr *)ac->ac_if.if_addrhead.tqh_first; aa;
335 aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
336 if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
337 ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
345 tpa.s_net = spa.s_net = AA_SAT( aa )->sat_addr.s_net;
348 spa.s_node = ea->aarp_spnode;
349 tpa.s_node = ea->aarp_tpnode;
350 ma.s_net = AA_SAT( aa )->sat_addr.s_net;
351 ma.s_node = AA_SAT( aa )->sat_addr.s_node;
354 * This looks like it's from us.
356 if ( spa.s_net == ma.s_net && spa.s_node == ma.s_node ) {
357 if ( aa->aa_flags & AFA_PROBING ) {
359 * We're probing, someone either responded to our probe, or
360 * probed for the same address we'd like to use. Change the
361 * address we're probing for.
363 untimeout( aarpprobe, ac, aa->aa_ch );
367 } else if ( op != AARPOP_PROBE ) {
369 * This is not a probe, and we're not probing. This means
370 * that someone's saying they have the same source address
371 * as the one we're using. Get upset...
374 "aarp: duplicate AT address!! %x:%x:%x:%x:%x:%x\n",
375 ea->aarp_sha[ 0 ], ea->aarp_sha[ 1 ], ea->aarp_sha[ 2 ],
376 ea->aarp_sha[ 3 ], ea->aarp_sha[ 4 ], ea->aarp_sha[ 5 ]);
382 AARPTAB_LOOK( aat, spa );
384 if ( op == AARPOP_PROBE ) {
386 * Someone's probing for spa, dealocate the one we've got,
387 * so that if the prober keeps the address, we'll be able
395 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
396 sizeof( ea->aarp_sha ));
397 aat->aat_flags |= ATF_COM;
398 if ( aat->aat_hold ) {
399 struct mbuf *mhold = aat->aat_hold;
400 aat->aat_hold = NULL;
401 sat.sat_len = sizeof(struct sockaddr_at);
402 sat.sat_family = AF_APPLETALK;
404 (*ac->ac_if.if_output)( &ac->ac_if, mhold,
405 (struct sockaddr *)&sat, NULL); /* XXX */
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;
417 * Don't respond to responses, and never respond if we're
420 if ( tpa.s_net != ma.s_net || tpa.s_node != ma.s_node ||
421 op == AARPOP_RESPONSE || ( aa->aa_flags & AFA_PROBING )) {
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 ));
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 ));
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 ), M_DONTWAIT );
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 );
449 bcopy( ea->aarp_spnet, ea->aarp_tpnet, sizeof( ea->aarp_tpnet ));
450 bcopy( &ma.s_net, ea->aarp_spnet, sizeof( ea->aarp_spnet ));
452 eh->ether_type = htons( ETHERTYPE_AARP );
455 ea->aarp_tpnode = ea->aarp_spnode;
456 ea->aarp_spnode = ma.s_node;
457 ea->aarp_op = htons( AARPOP_RESPONSE );
459 sa.sa_len = sizeof( struct sockaddr );
460 sa.sa_family = AF_UNSPEC;
461 (*ac->ac_if.if_output)( &ac->ac_if, m, &sa, NULL); /* XXX */
466 aarptfree( struct aarptab *aat)
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;
479 struct at_addr *addr;
483 struct aarptab *aat, *aato = NULL;
484 static int first = 1;
488 aarptimer_ch = timeout( aarptimer, (caddr_t)0, hz );
490 aat = &aarptab[ AARPTAB_HASH( *addr ) * AARPTAB_BSIZ ];
491 for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) {
492 if ( aat->aat_flags == 0 )
494 if ( aat->aat_flags & ATF_PERM )
496 if ((int) aat->aat_timer > oldest ) {
497 oldest = aat->aat_timer;
506 aat->aat_ataddr = *addr;
507 aat->aat_flags = ATF_INUSE;
513 aarpprobe( void *arg )
515 struct arpcom *ac = arg;
517 struct ether_header *eh;
518 struct ether_aarp *ea;
519 struct at_ifaddr *aa;
524 * We need to check whether the output ethernet type should
525 * be phase 1 or 2. We have the interface that we'll be sending
526 * the aarp out. We need to find an AppleTalk network on that
527 * interface with the same address as we're looking for. If the
528 * net is phase 2, generate an 802.2 and SNAP header.
530 for (aa = (struct at_ifaddr *)ac->ac_if.if_addrhead.tqh_first; aa;
531 aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
532 if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
533 ( aa->aa_flags & AFA_PROBING )) {
537 if ( aa == NULL ) { /* serious error XXX */
538 printf( "aarpprobe why did this happen?!\n" );
542 if ( aa->aa_probcnt <= 0 ) {
543 aa->aa_flags &= ~AFA_PROBING;
547 aa->aa_ch = timeout( aarpprobe, (caddr_t)ac, hz / 5 );
550 if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
553 m->m_len = sizeof( *ea );
554 m->m_pkthdr.len = sizeof( *ea );
555 MH_ALIGN( m, sizeof( *ea ));
557 ea = mtod( m, struct ether_aarp *);
558 bzero((caddr_t)ea, sizeof( *ea ));
560 ea->aarp_hrd = htons( AARPHRD_ETHER );
561 ea->aarp_pro = htons( ETHERTYPE_AT );
562 ea->aarp_hln = sizeof( ea->aarp_sha );
563 ea->aarp_pln = sizeof( ea->aarp_spu );
564 ea->aarp_op = htons( AARPOP_PROBE );
565 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
566 sizeof( ea->aarp_sha ));
568 eh = (struct ether_header *)sa.sa_data;
570 if ( aa->aa_flags & AFA_PHASE2 ) {
571 bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
572 sizeof( eh->ether_dhost ));
573 eh->ether_type = htons( sizeof( struct llc ) +
574 sizeof( struct ether_aarp ));
575 M_PREPEND( m, sizeof( struct llc ), M_WAIT );
576 llc = mtod( m, struct llc *);
577 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
578 llc->llc_control = LLC_UI;
579 bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
580 llc->llc_ether_type = htons( ETHERTYPE_AARP );
582 bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
583 sizeof( ea->aarp_spnet ));
584 bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_tpnet,
585 sizeof( ea->aarp_tpnet ));
586 ea->aarp_spnode = ea->aarp_tpnode = AA_SAT( aa )->sat_addr.s_node;
588 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
589 sizeof( eh->ether_dhost ));
590 eh->ether_type = htons( ETHERTYPE_AARP );
591 ea->aarp_spa = ea->aarp_tpa = AA_SAT( aa )->sat_addr.s_node;
595 printf("aarp: sending probe for %u.%u\n",
596 ntohs(AA_SAT( aa )->sat_addr.s_net),
597 AA_SAT( aa )->sat_addr.s_node);
598 #endif /* NETATALKDEBUG */
600 sa.sa_len = sizeof( struct sockaddr );
601 sa.sa_family = AF_UNSPEC;
602 (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, NULL); /* XXX */
612 untimeout( aarptimer, 0, aarptimer_ch );
613 for ( i = 0, aat = aarptab; i < AARPTAB_SIZE; i++, aat++ ) {
614 if ( aat->aat_hold ) {
615 m_freem( aat->aat_hold );
616 aat->aat_hold = NULL;