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 1.7 2004/03/06 01:58:56 hsu 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>
19 #include <net/netisr.h>
21 #include <netinet/in.h>
23 #include <netinet/if_ether.h>
29 #include "at_extern.h"
31 static void aarptfree( struct aarptab *aat);
32 static void at_aarpinput( struct arpcom *ac, struct mbuf *m);
34 #define AARPTAB_BSIZ 9
36 #define AARPTAB_SIZE (AARPTAB_BSIZ * AARPTAB_NB)
37 static struct aarptab aarptab[AARPTAB_SIZE];
39 #define AARPTAB_HASH(a) \
40 ((((a).s_net << 8 ) + (a).s_node ) % AARPTAB_NB )
42 #define AARPTAB_LOOK(aat,addr) { \
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 ) \
49 if ( n >= AARPTAB_BSIZ ) \
53 #define AARPT_AGE (60 * 1)
54 #define AARPT_KILLC 20
57 # if !defined( __DragonFly__ )
58 extern u_char etherbroadcastaddr[6];
61 static u_char atmulticastaddr[ 6 ] = {
62 0x09, 0x00, 0x07, 0xff, 0xff, 0xff,
65 u_char at_org_code[ 3 ] = {
68 u_char aarp_org_code[ 3 ] = {
72 static struct callout_handle aarptimer_ch =
73 CALLOUT_HANDLE_INITIALIZER(&aarptimer_ch);
76 aarptimer(void *ignored)
81 aarptimer_ch = timeout( aarptimer, (caddr_t)0, AARPT_AGE * hz );
83 for ( i = 0; i < AARPTAB_SIZE; i++, aat++ ) {
84 if ( aat->aat_flags == 0 || ( aat->aat_flags & ATF_PERM ))
86 if ( ++aat->aat_timer < (( aat->aat_flags & ATF_COM ) ?
87 AARPT_KILLC : AARPT_KILLI ))
96 * search through the network addresses to find one that includes
97 * the given network.. remember to take netranges into
101 at_ifawithnet(struct sockaddr_at *sat )
103 struct at_ifaddr *aa;
104 struct sockaddr_at *sat2;
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 ) {
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))) {
121 aarpwhohas( struct arpcom *ac, struct sockaddr_at *sat )
124 struct ether_header *eh;
125 struct ether_aarp *ea;
126 struct at_ifaddr *aa;
130 if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
133 m->m_len = sizeof( *ea );
134 m->m_pkthdr.len = sizeof( *ea );
135 MH_ALIGN( m, sizeof( *ea ));
137 ea = mtod( m, struct ether_aarp *);
138 bzero((caddr_t)ea, sizeof( *ea ));
140 ea->aarp_hrd = htons( AARPHRD_ETHER );
141 ea->aarp_pro = htons( ETHERTYPE_AT );
142 ea->aarp_hln = sizeof( ea->aarp_sha );
143 ea->aarp_pln = sizeof( ea->aarp_spu );
144 ea->aarp_op = htons( AARPOP_REQUEST );
145 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
146 sizeof( ea->aarp_sha ));
149 * We need to check whether the output ethernet type should
150 * be phase 1 or 2. We have the interface that we'll be sending
151 * the aarp out. We need to find an AppleTalk network on that
152 * interface with the same address as we're looking for. If the
153 * net is phase 2, generate an 802.2 and SNAP header.
155 if ((aa = at_ifawithnet( sat )) == NULL) {
160 eh = (struct ether_header *)sa.sa_data;
162 if ( aa->aa_flags & AFA_PHASE2 ) {
163 bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
164 sizeof( eh->ether_dhost ));
165 eh->ether_type = htons(sizeof(struct llc) + sizeof(struct ether_aarp));
166 M_PREPEND( m, sizeof( struct llc ), M_WAIT );
167 llc = mtod( m, struct llc *);
168 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
169 llc->llc_control = LLC_UI;
170 bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
171 llc->llc_ether_type = htons( ETHERTYPE_AARP );
173 bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
174 sizeof( ea->aarp_spnet ));
175 bcopy( &sat->sat_addr.s_net, ea->aarp_tpnet,
176 sizeof( ea->aarp_tpnet ));
177 ea->aarp_spnode = AA_SAT( aa )->sat_addr.s_node;
178 ea->aarp_tpnode = sat->sat_addr.s_node;
180 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
181 sizeof( eh->ether_dhost ));
182 eh->ether_type = htons( ETHERTYPE_AARP );
184 ea->aarp_spa = AA_SAT( aa )->sat_addr.s_node;
185 ea->aarp_tpa = sat->sat_addr.s_node;
189 printf("aarp: sending request for %u.%u\n",
190 ntohs(AA_SAT( aa )->sat_addr.s_net),
191 AA_SAT( aa )->sat_addr.s_node);
192 #endif /* NETATALKDEBUG */
194 sa.sa_len = sizeof( struct sockaddr );
195 sa.sa_family = AF_UNSPEC;
196 (*ac->ac_if.if_output)(&ac->ac_if,
197 m, &sa, NULL); /* XXX NULL should be routing information */
201 aarpresolve( ac, m, destsat, desten )
204 struct sockaddr_at *destsat;
207 struct at_ifaddr *aa;
211 if ( at_broadcast( destsat )) {
212 m->m_flags |= M_BCAST;
213 if ((aa = at_ifawithnet( destsat )) == NULL) {
217 if ( aa->aa_flags & AFA_PHASE2 ) {
218 bcopy( (caddr_t)atmulticastaddr, (caddr_t)desten,
219 sizeof( atmulticastaddr ));
221 bcopy( (caddr_t)etherbroadcastaddr, (caddr_t)desten,
222 sizeof( etherbroadcastaddr ));
228 AARPTAB_LOOK( aat, destsat->sat_addr );
229 if ( aat == 0 ) { /* No entry */
230 aat = aarptnew( &destsat->sat_addr );
232 panic( "aarpresolve: no free entry" );
235 aarpwhohas( ac, destsat );
241 if ( aat->aat_flags & ATF_COM ) { /* entry is COMplete */
242 bcopy( (caddr_t)aat->aat_enaddr, (caddr_t)desten,
243 sizeof( aat->aat_enaddr ));
247 /* entry has not completed */
248 if ( aat->aat_hold ) {
249 m_freem( aat->aat_hold );
252 aarpwhohas( ac, destsat );
258 aarpintr(struct netmsg *msg)
260 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
264 ac = (struct arpcom *)m->m_pkthdr.rcvif;
265 if ( ac->ac_if.if_flags & IFF_NOARP )
268 if ( m->m_len < sizeof( struct arphdr )) {
272 ar = mtod( m, struct arphdr *);
273 if ( ntohs( ar->ar_hrd ) != AARPHRD_ETHER ) {
277 if ( m->m_len < sizeof( struct arphdr ) + 2 * ar->ar_hln +
282 switch( ntohs( ar->ar_pro )) {
284 at_aarpinput( ac, m );
296 at_aarpinput( struct arpcom *ac, struct mbuf *m)
298 struct ether_aarp *ea;
299 struct at_ifaddr *aa;
301 struct ether_header *eh;
303 struct sockaddr_at sat;
305 struct at_addr spa, tpa, ma;
309 ea = mtod( m, struct ether_aarp *);
311 /* Check to see if from my hardware address */
312 if ( !bcmp(( caddr_t )ea->aarp_sha, ( caddr_t )ac->ac_enaddr,
313 sizeof( ac->ac_enaddr ))) {
318 op = ntohs( ea->aarp_op );
319 bcopy( ea->aarp_tpnet, &net, sizeof( net ));
321 if ( net != 0 ) { /* should be ATADDR_ANYNET? */
322 sat.sat_len = sizeof(struct sockaddr_at);
323 sat.sat_family = AF_APPLETALK;
324 sat.sat_addr.s_net = net;
325 if ((aa = at_ifawithnet( &sat )) == NULL) {
329 bcopy( ea->aarp_spnet, &spa.s_net, sizeof( spa.s_net ));
330 bcopy( ea->aarp_tpnet, &tpa.s_net, sizeof( tpa.s_net ));
333 * Since we don't know the net, we just look for the first
334 * phase 1 address on the interface.
336 for (aa = (struct at_ifaddr *)ac->ac_if.if_addrhead.tqh_first; aa;
337 aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
338 if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
339 ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
347 tpa.s_net = spa.s_net = AA_SAT( aa )->sat_addr.s_net;
350 spa.s_node = ea->aarp_spnode;
351 tpa.s_node = ea->aarp_tpnode;
352 ma.s_net = AA_SAT( aa )->sat_addr.s_net;
353 ma.s_node = AA_SAT( aa )->sat_addr.s_node;
356 * This looks like it's from us.
358 if ( spa.s_net == ma.s_net && spa.s_node == ma.s_node ) {
359 if ( aa->aa_flags & AFA_PROBING ) {
361 * We're probing, someone either responded to our probe, or
362 * probed for the same address we'd like to use. Change the
363 * address we're probing for.
365 untimeout( aarpprobe, ac, aa->aa_ch );
369 } else if ( op != AARPOP_PROBE ) {
371 * This is not a probe, and we're not probing. This means
372 * that someone's saying they have the same source address
373 * as the one we're using. Get upset...
376 "aarp: duplicate AT address!! %x:%x:%x:%x:%x:%x\n",
377 ea->aarp_sha[ 0 ], ea->aarp_sha[ 1 ], ea->aarp_sha[ 2 ],
378 ea->aarp_sha[ 3 ], ea->aarp_sha[ 4 ], ea->aarp_sha[ 5 ]);
384 AARPTAB_LOOK( aat, spa );
386 if ( op == AARPOP_PROBE ) {
388 * Someone's probing for spa, dealocate the one we've got,
389 * so that if the prober keeps the address, we'll be able
397 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
398 sizeof( ea->aarp_sha ));
399 aat->aat_flags |= ATF_COM;
400 if ( aat->aat_hold ) {
401 struct mbuf *mhold = aat->aat_hold;
402 aat->aat_hold = NULL;
403 sat.sat_len = sizeof(struct sockaddr_at);
404 sat.sat_family = AF_APPLETALK;
406 (*ac->ac_if.if_output)( &ac->ac_if, mhold,
407 (struct sockaddr *)&sat, NULL); /* XXX */
409 } else if ((tpa.s_net == ma.s_net)
410 && (tpa.s_node == ma.s_node)
411 && (op != AARPOP_PROBE)
412 && ((aat = aarptnew( &spa )) != NULL)) {
413 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
414 sizeof( ea->aarp_sha ));
415 aat->aat_flags |= ATF_COM;
419 * Don't respond to responses, and never respond if we're
422 if ( tpa.s_net != ma.s_net || tpa.s_node != ma.s_node ||
423 op == AARPOP_RESPONSE || ( aa->aa_flags & AFA_PROBING )) {
428 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )ea->aarp_tha,
429 sizeof( ea->aarp_sha ));
430 bcopy(( caddr_t )ac->ac_enaddr, ( caddr_t )ea->aarp_sha,
431 sizeof( ea->aarp_sha ));
434 eh = (struct ether_header *)sa.sa_data;
435 bcopy(( caddr_t )ea->aarp_tha, ( caddr_t )eh->ether_dhost,
436 sizeof( eh->ether_dhost ));
438 if ( aa->aa_flags & AFA_PHASE2 ) {
439 eh->ether_type = htons( sizeof( struct llc ) +
440 sizeof( struct ether_aarp ));
441 M_PREPEND( m, sizeof( struct llc ), M_DONTWAIT );
445 llc = mtod( m, struct llc *);
446 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
447 llc->llc_control = LLC_UI;
448 bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
449 llc->llc_ether_type = htons( ETHERTYPE_AARP );
451 bcopy( ea->aarp_spnet, ea->aarp_tpnet, sizeof( ea->aarp_tpnet ));
452 bcopy( &ma.s_net, ea->aarp_spnet, sizeof( ea->aarp_spnet ));
454 eh->ether_type = htons( ETHERTYPE_AARP );
457 ea->aarp_tpnode = ea->aarp_spnode;
458 ea->aarp_spnode = ma.s_node;
459 ea->aarp_op = htons( AARPOP_RESPONSE );
461 sa.sa_len = sizeof( struct sockaddr );
462 sa.sa_family = AF_UNSPEC;
463 (*ac->ac_if.if_output)( &ac->ac_if, m, &sa, NULL); /* XXX */
468 aarptfree( struct aarptab *aat)
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;
481 struct at_addr *addr;
485 struct aarptab *aat, *aato = NULL;
486 static int first = 1;
490 aarptimer_ch = timeout( aarptimer, (caddr_t)0, hz );
492 aat = &aarptab[ AARPTAB_HASH( *addr ) * AARPTAB_BSIZ ];
493 for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) {
494 if ( aat->aat_flags == 0 )
496 if ( aat->aat_flags & ATF_PERM )
498 if ((int) aat->aat_timer > oldest ) {
499 oldest = aat->aat_timer;
508 aat->aat_ataddr = *addr;
509 aat->aat_flags = ATF_INUSE;
515 aarpprobe( void *arg )
517 struct arpcom *ac = arg;
519 struct ether_header *eh;
520 struct ether_aarp *ea;
521 struct at_ifaddr *aa;
526 * We need to check whether the output ethernet type should
527 * be phase 1 or 2. We have the interface that we'll be sending
528 * the aarp out. We need to find an AppleTalk network on that
529 * interface with the same address as we're looking for. If the
530 * net is phase 2, generate an 802.2 and SNAP header.
532 for (aa = (struct at_ifaddr *)ac->ac_if.if_addrhead.tqh_first; aa;
533 aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
534 if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
535 ( aa->aa_flags & AFA_PROBING )) {
539 if ( aa == NULL ) { /* serious error XXX */
540 printf( "aarpprobe why did this happen?!\n" );
544 if ( aa->aa_probcnt <= 0 ) {
545 aa->aa_flags &= ~AFA_PROBING;
549 aa->aa_ch = timeout( aarpprobe, (caddr_t)ac, hz / 5 );
552 if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
555 m->m_len = sizeof( *ea );
556 m->m_pkthdr.len = sizeof( *ea );
557 MH_ALIGN( m, sizeof( *ea ));
559 ea = mtod( m, struct ether_aarp *);
560 bzero((caddr_t)ea, sizeof( *ea ));
562 ea->aarp_hrd = htons( AARPHRD_ETHER );
563 ea->aarp_pro = htons( ETHERTYPE_AT );
564 ea->aarp_hln = sizeof( ea->aarp_sha );
565 ea->aarp_pln = sizeof( ea->aarp_spu );
566 ea->aarp_op = htons( AARPOP_PROBE );
567 bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
568 sizeof( ea->aarp_sha ));
570 eh = (struct ether_header *)sa.sa_data;
572 if ( aa->aa_flags & AFA_PHASE2 ) {
573 bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
574 sizeof( eh->ether_dhost ));
575 eh->ether_type = htons( sizeof( struct llc ) +
576 sizeof( struct ether_aarp ));
577 M_PREPEND( m, sizeof( struct llc ), M_WAIT );
579 llc = mtod( m, struct llc *);
580 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
581 llc->llc_control = LLC_UI;
582 bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
583 llc->llc_ether_type = htons( ETHERTYPE_AARP );
585 bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
586 sizeof( ea->aarp_spnet ));
587 bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_tpnet,
588 sizeof( ea->aarp_tpnet ));
589 ea->aarp_spnode = ea->aarp_tpnode = AA_SAT( aa )->sat_addr.s_node;
591 bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
592 sizeof( eh->ether_dhost ));
593 eh->ether_type = htons( ETHERTYPE_AARP );
594 ea->aarp_spa = ea->aarp_tpa = AA_SAT( aa )->sat_addr.s_node;
598 printf("aarp: sending probe for %u.%u\n",
599 ntohs(AA_SAT( aa )->sat_addr.s_net),
600 AA_SAT( aa )->sat_addr.s_node);
601 #endif /* NETATALKDEBUG */
603 sa.sa_len = sizeof( struct sockaddr );
604 sa.sa_family = AF_UNSPEC;
605 (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, NULL); /* XXX */
615 untimeout( aarptimer, 0, aarptimer_ch );
616 for ( i = 0, aat = aarptab; i < AARPTAB_SIZE; i++, aat++ ) {
617 if ( aat->aat_hold ) {
618 m_freem( aat->aat_hold );
619 aat->aat_hold = NULL;