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 1.15 2004/12/21 02:54:48 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>
18 #include <sys/thread2.h>
19 #include <sys/msgport2.h>
22 #include <net/netisr.h>
24 #include <netinet/in.h>
26 #include <netinet/if_ether.h>
32 #include "at_extern.h"
34 static void aarptfree( struct aarptab *aat);
35 static void at_aarpinput( struct arpcom *ac, struct mbuf *m);
37 #define AARPTAB_BSIZ 9
39 #define AARPTAB_SIZE (AARPTAB_BSIZ * AARPTAB_NB)
40 static struct aarptab aarptab[AARPTAB_SIZE];
42 #define AARPTAB_HASH(a) \
43 ((((a).s_net << 8 ) + (a).s_node ) % AARPTAB_NB )
45 #define AARPTAB_LOOK(aat,addr) { \
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 ) \
52 if ( n >= AARPTAB_BSIZ ) \
56 #define AARPT_AGE (60 * 1)
57 #define AARPT_KILLC 20
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 aarptimer_ch;
74 aarptimer(void *ignored)
80 for ( i = 0; i < AARPTAB_SIZE; i++, aat++ ) {
81 if ( aat->aat_flags == 0 || ( aat->aat_flags & ATF_PERM ))
83 if ( ++aat->aat_timer < (( aat->aat_flags & ATF_COM ) ?
84 AARPT_KILLC : AARPT_KILLI ))
90 callout_reset(&aarptimer_ch, AARPT_AGE * hz, aarptimer, NULL);
94 * search through the network addresses to find one that includes
95 * the given network.. remember to take netranges into
99 at_ifawithnet(struct sockaddr_at *sat )
101 struct at_ifaddr *aa;
102 struct sockaddr_at *sat2;
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 ) {
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))) {
119 aarpwhohas( struct arpcom *ac, struct sockaddr_at *sat )
122 struct ether_header *eh;
123 struct ether_aarp *ea;
124 struct at_ifaddr *aa;
128 if (( m = m_gethdr( MB_DONTWAIT, MT_DATA )) == NULL ) {
131 m->m_len = sizeof( *ea );
132 m->m_pkthdr.len = sizeof( *ea );
133 MH_ALIGN( m, sizeof( *ea ));
135 ea = mtod( m, struct ether_aarp *);
136 bzero((caddr_t)ea, sizeof( *ea ));
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);
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.
152 if ((aa = at_ifawithnet( sat )) == NULL) {
157 eh = (struct ether_header *)sa.sa_data;
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 );
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;
177 bcopy(ac->ac_if.if_broadcastaddr, eh->ether_dhost,
178 ac->ac_if.if_addrlen);
179 eh->ether_type = htons( ETHERTYPE_AARP );
181 ea->aarp_spa = AA_SAT( aa )->sat_addr.s_node;
182 ea->aarp_tpa = sat->sat_addr.s_node;
186 printf("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 */
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 */
198 aarpresolve( ac, m, destsat, desten )
201 struct sockaddr_at *destsat;
204 struct at_ifaddr *aa;
208 if (at_broadcast(destsat)) {
209 m->m_flags |= M_BCAST;
210 if ((aa = at_ifawithnet(destsat)) == NULL) {
214 if (aa->aa_flags & AFA_PHASE2)
215 bcopy(atmulticastaddr, desten, sizeof atmulticastaddr);
217 bcopy(ac->ac_if.if_broadcastaddr, desten, ac->ac_if.if_addrlen);
222 AARPTAB_LOOK( aat, destsat->sat_addr );
223 if (aat == NULL) { /* No entry */
224 aat = aarptnew( &destsat->sat_addr );
226 panic("aarpresolve: no free entry");
229 aarpwhohas(ac, destsat);
235 if (aat->aat_flags & ATF_COM) { /* entry is COMplete */
236 bcopy(aat->aat_enaddr, desten, sizeof aat->aat_enaddr);
240 /* entry has not completed */
242 m_freem(aat->aat_hold);
245 aarpwhohas(ac, destsat);
251 aarpintr(struct netmsg *msg)
253 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
257 ac = (struct arpcom *)m->m_pkthdr.rcvif;
258 if ( ac->ac_if.if_flags & IFF_NOARP )
261 if ( m->m_len < sizeof( struct arphdr )) {
265 ar = mtod( m, struct arphdr *);
266 if ( ntohs( ar->ar_hrd ) != AARPHRD_ETHER ) {
270 if ( m->m_len < sizeof( struct arphdr ) + 2 * ar->ar_hln +
275 switch( ntohs( ar->ar_pro )) {
277 at_aarpinput( ac, m );
287 lwkt_replymsg(&msg->nm_lmsg, 0);
292 at_aarpinput( struct arpcom *ac, struct mbuf *m)
294 struct ether_aarp *ea;
296 struct at_ifaddr *aa = NULL;
298 struct ether_header *eh;
300 struct sockaddr_at sat;
302 struct at_addr spa, tpa, ma;
306 ea = mtod( m, struct ether_aarp *);
308 /* Check to see if from my hardware address */
309 if ( !bcmp(( caddr_t )ea->aarp_sha, ( caddr_t )ac->ac_enaddr,
310 sizeof( ac->ac_enaddr ))) {
315 op = ntohs(ea->aarp_op);
316 bcopy(ea->aarp_tpnet, &net, sizeof net);
318 if ( net != 0 ) { /* should be ATADDR_ANYNET? */
319 sat.sat_len = sizeof(struct sockaddr_at);
320 sat.sat_family = AF_APPLETALK;
321 sat.sat_addr.s_net = net;
322 if ((aa = at_ifawithnet(&sat)) == NULL) {
326 bcopy(ea->aarp_spnet, &spa.s_net, sizeof spa.s_net);
327 bcopy(ea->aarp_tpnet, &tpa.s_net, sizeof tpa.s_net);
330 * Since we don't know the net, we just look for the first
331 * phase 1 address on the interface.
333 TAILQ_FOREACH(ifa, &ac->ac_if.if_addrhead, ifa_link) {
334 aa = (struct at_ifaddr *)ifa;
335 if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
336 ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
344 tpa.s_net = spa.s_net = AA_SAT( aa )->sat_addr.s_net;
347 spa.s_node = ea->aarp_spnode;
348 tpa.s_node = ea->aarp_tpnode;
349 ma.s_net = AA_SAT( aa )->sat_addr.s_net;
350 ma.s_node = AA_SAT( aa )->sat_addr.s_node;
353 * This looks like it's from us.
355 if ( spa.s_net == ma.s_net && spa.s_node == ma.s_node ) {
356 if ( aa->aa_flags & AFA_PROBING ) {
358 * We're probing, someone either responded to our probe, or
359 * probed for the same address we'd like to use. Change the
360 * address we're probing for.
362 callout_stop(&aa->aa_ch);
366 } else if ( op != AARPOP_PROBE ) {
368 * This is not a probe, and we're not probing. This means
369 * that someone's saying they have the same source address
370 * as the one we're using. Get upset...
373 "aarp: duplicate AT address!! %x:%x:%x:%x:%x:%x\n",
374 ea->aarp_sha[ 0 ], ea->aarp_sha[ 1 ], ea->aarp_sha[ 2 ],
375 ea->aarp_sha[ 3 ], ea->aarp_sha[ 4 ], ea->aarp_sha[ 5 ]);
381 AARPTAB_LOOK( aat, spa );
383 if ( op == AARPOP_PROBE ) {
385 * Someone's probing for spa, dealocate the one we've got,
386 * so that if the prober keeps the address, we'll be able
394 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
395 sizeof( ea->aarp_sha ));
396 aat->aat_flags |= ATF_COM;
397 if ( aat->aat_hold ) {
398 struct mbuf *mhold = aat->aat_hold;
399 aat->aat_hold = NULL;
400 sat.sat_len = sizeof(struct sockaddr_at);
401 sat.sat_family = AF_APPLETALK;
403 (*ac->ac_if.if_output)( &ac->ac_if, mhold,
404 (struct sockaddr *)&sat, NULL); /* XXX */
406 } else if ((tpa.s_net == ma.s_net)
407 && (tpa.s_node == ma.s_node)
408 && (op != AARPOP_PROBE)
409 && ((aat = aarptnew( &spa )) != NULL)) {
410 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
411 sizeof( ea->aarp_sha ));
412 aat->aat_flags |= ATF_COM;
416 * Don't respond to responses, and never respond if we're
419 if ( tpa.s_net != ma.s_net || tpa.s_node != ma.s_node ||
420 op == AARPOP_RESPONSE || ( aa->aa_flags & AFA_PROBING )) {
425 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )ea->aarp_tha,
426 sizeof( ea->aarp_sha ));
427 bcopy(( caddr_t )ac->ac_enaddr, ( caddr_t )ea->aarp_sha,
428 sizeof( ea->aarp_sha ));
431 eh = (struct ether_header *)sa.sa_data;
432 bcopy(( caddr_t )ea->aarp_tha, ( caddr_t )eh->ether_dhost,
433 sizeof( eh->ether_dhost ));
435 if ( aa->aa_flags & AFA_PHASE2 ) {
436 eh->ether_type = htons( sizeof( struct llc ) +
437 sizeof( struct ether_aarp ));
438 M_PREPEND( m, sizeof( struct llc ), MB_DONTWAIT );
442 llc = mtod( m, struct llc *);
443 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
444 llc->llc_control = LLC_UI;
445 bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
446 llc->llc_ether_type = htons( ETHERTYPE_AARP );
448 bcopy( ea->aarp_spnet, ea->aarp_tpnet, sizeof( ea->aarp_tpnet ));
449 bcopy( &ma.s_net, ea->aarp_spnet, sizeof( ea->aarp_spnet ));
451 eh->ether_type = htons( ETHERTYPE_AARP );
454 ea->aarp_tpnode = ea->aarp_spnode;
455 ea->aarp_spnode = ma.s_node;
456 ea->aarp_op = htons( AARPOP_RESPONSE );
458 sa.sa_len = sizeof( struct sockaddr );
459 sa.sa_family = AF_UNSPEC;
460 (*ac->ac_if.if_output)( &ac->ac_if, m, &sa, NULL); /* XXX */
465 aarptfree( struct aarptab *aat)
469 m_freem( aat->aat_hold );
470 aat->aat_hold = NULL;
471 aat->aat_timer = aat->aat_flags = 0;
472 aat->aat_ataddr.s_net = 0;
473 aat->aat_ataddr.s_node = 0;
478 struct at_addr *addr;
482 struct aarptab *aat, *aato = NULL;
483 static int first = 1;
487 callout_init(&aarptimer_ch);
488 callout_reset(&aarptimer_ch, hz, aarptimer, NULL);
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;
520 struct at_ifaddr *aa = NULL;
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.
531 TAILQ_FOREACH(ifa, &ac->ac_if.if_addrhead, ifa_link) {
532 aa = (struct at_ifaddr *)ifa;
533 if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
534 ( aa->aa_flags & AFA_PROBING )) {
538 if ( aa == NULL ) { /* serious error XXX */
539 printf( "aarpprobe why did this happen?!\n" );
543 if ( aa->aa_probcnt <= 0 ) {
544 aa->aa_flags &= ~AFA_PROBING;
548 callout_reset(&aa->aa_ch, hz / 5, aarpprobe, ac);
551 if (( m = m_gethdr( MB_DONTWAIT, MT_DATA )) == NULL ) {
554 m->m_len = sizeof( *ea );
555 m->m_pkthdr.len = sizeof( *ea );
556 MH_ALIGN( m, sizeof( *ea ));
558 ea = mtod( m, struct ether_aarp *);
559 bzero((caddr_t)ea, sizeof( *ea ));
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 ));
569 eh = (struct ether_header *)sa.sa_data;
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 );
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 );
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;
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;
597 printf("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 */
602 sa.sa_len = sizeof( struct sockaddr );
603 sa.sa_family = AF_UNSPEC;
604 (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, NULL); /* XXX */
614 callout_stop(&aarptimer_ch);
615 for ( i = 0, aat = aarptab; i < AARPTAB_SIZE; i++, aat++ ) {
616 if ( aat->aat_hold ) {
617 m_freem( aat->aat_hold );
618 aat->aat_hold = NULL;