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 1.12 2004/07/17 09:43:06 joerg 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_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( MB_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 ), MB_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(ac->ac_if.if_broadcastaddr, eh->ether_dhost,
180 ac->ac_if.if_addrlen);
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(ac->ac_if.if_broadcastaddr, desten, ac->ac_if.if_addrlen);
226 AARPTAB_LOOK( aat, destsat->sat_addr );
227 if ( aat == 0 ) { /* No entry */
228 aat = aarptnew( &destsat->sat_addr );
230 panic( "aarpresolve: no free entry" );
233 aarpwhohas( ac, destsat );
239 if ( aat->aat_flags & ATF_COM ) { /* entry is COMplete */
240 bcopy( (caddr_t)aat->aat_enaddr, (caddr_t)desten,
241 sizeof( aat->aat_enaddr ));
245 /* entry has not completed */
246 if ( aat->aat_hold ) {
247 m_freem( aat->aat_hold );
250 aarpwhohas( ac, destsat );
256 aarpintr(struct netmsg *msg)
258 struct mbuf *m = ((struct netmsg_packet *)msg)->nm_packet;
262 ac = (struct arpcom *)m->m_pkthdr.rcvif;
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 );
292 lwkt_replymsg(&msg->nm_lmsg, 0);
297 at_aarpinput( struct arpcom *ac, struct mbuf *m)
299 struct ether_aarp *ea;
300 struct at_ifaddr *aa;
302 struct ether_header *eh;
304 struct sockaddr_at sat;
306 struct at_addr spa, tpa, ma;
310 ea = mtod( m, struct ether_aarp *);
312 /* Check to see if from my hardware address */
313 if ( !bcmp(( caddr_t )ea->aarp_sha, ( caddr_t )ac->ac_enaddr,
314 sizeof( ac->ac_enaddr ))) {
319 op = ntohs( ea->aarp_op );
320 bcopy( ea->aarp_tpnet, &net, sizeof( net ));
322 if ( net != 0 ) { /* should be ATADDR_ANYNET? */
323 sat.sat_len = sizeof(struct sockaddr_at);
324 sat.sat_family = AF_APPLETALK;
325 sat.sat_addr.s_net = net;
326 if ((aa = at_ifawithnet( &sat )) == NULL) {
330 bcopy( ea->aarp_spnet, &spa.s_net, sizeof( spa.s_net ));
331 bcopy( ea->aarp_tpnet, &tpa.s_net, sizeof( tpa.s_net ));
334 * Since we don't know the net, we just look for the first
335 * phase 1 address on the interface.
337 for (aa = (struct at_ifaddr *)ac->ac_if.if_addrhead.tqh_first; aa;
338 aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
339 if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
340 ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
348 tpa.s_net = spa.s_net = AA_SAT( aa )->sat_addr.s_net;
351 spa.s_node = ea->aarp_spnode;
352 tpa.s_node = ea->aarp_tpnode;
353 ma.s_net = AA_SAT( aa )->sat_addr.s_net;
354 ma.s_node = AA_SAT( aa )->sat_addr.s_node;
357 * This looks like it's from us.
359 if ( spa.s_net == ma.s_net && spa.s_node == ma.s_node ) {
360 if ( aa->aa_flags & AFA_PROBING ) {
362 * We're probing, someone either responded to our probe, or
363 * probed for the same address we'd like to use. Change the
364 * address we're probing for.
366 untimeout( aarpprobe, ac, aa->aa_ch );
370 } else if ( op != AARPOP_PROBE ) {
372 * This is not a probe, and we're not probing. This means
373 * that someone's saying they have the same source address
374 * as the one we're using. Get upset...
377 "aarp: duplicate AT address!! %x:%x:%x:%x:%x:%x\n",
378 ea->aarp_sha[ 0 ], ea->aarp_sha[ 1 ], ea->aarp_sha[ 2 ],
379 ea->aarp_sha[ 3 ], ea->aarp_sha[ 4 ], ea->aarp_sha[ 5 ]);
385 AARPTAB_LOOK( aat, spa );
387 if ( op == AARPOP_PROBE ) {
389 * Someone's probing for spa, dealocate the one we've got,
390 * so that if the prober keeps the address, we'll be able
398 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
399 sizeof( ea->aarp_sha ));
400 aat->aat_flags |= ATF_COM;
401 if ( aat->aat_hold ) {
402 struct mbuf *mhold = aat->aat_hold;
403 aat->aat_hold = NULL;
404 sat.sat_len = sizeof(struct sockaddr_at);
405 sat.sat_family = AF_APPLETALK;
407 (*ac->ac_if.if_output)( &ac->ac_if, mhold,
408 (struct sockaddr *)&sat, NULL); /* XXX */
410 } else if ((tpa.s_net == ma.s_net)
411 && (tpa.s_node == ma.s_node)
412 && (op != AARPOP_PROBE)
413 && ((aat = aarptnew( &spa )) != NULL)) {
414 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
415 sizeof( ea->aarp_sha ));
416 aat->aat_flags |= ATF_COM;
420 * Don't respond to responses, and never respond if we're
423 if ( tpa.s_net != ma.s_net || tpa.s_node != ma.s_node ||
424 op == AARPOP_RESPONSE || ( aa->aa_flags & AFA_PROBING )) {
429 bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )ea->aarp_tha,
430 sizeof( ea->aarp_sha ));
431 bcopy(( caddr_t )ac->ac_enaddr, ( caddr_t )ea->aarp_sha,
432 sizeof( ea->aarp_sha ));
435 eh = (struct ether_header *)sa.sa_data;
436 bcopy(( caddr_t )ea->aarp_tha, ( caddr_t )eh->ether_dhost,
437 sizeof( eh->ether_dhost ));
439 if ( aa->aa_flags & AFA_PHASE2 ) {
440 eh->ether_type = htons( sizeof( struct llc ) +
441 sizeof( struct ether_aarp ));
442 M_PREPEND( m, sizeof( struct llc ), MB_DONTWAIT );
446 llc = mtod( m, struct llc *);
447 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
448 llc->llc_control = LLC_UI;
449 bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
450 llc->llc_ether_type = htons( ETHERTYPE_AARP );
452 bcopy( ea->aarp_spnet, ea->aarp_tpnet, sizeof( ea->aarp_tpnet ));
453 bcopy( &ma.s_net, ea->aarp_spnet, sizeof( ea->aarp_spnet ));
455 eh->ether_type = htons( ETHERTYPE_AARP );
458 ea->aarp_tpnode = ea->aarp_spnode;
459 ea->aarp_spnode = ma.s_node;
460 ea->aarp_op = htons( AARPOP_RESPONSE );
462 sa.sa_len = sizeof( struct sockaddr );
463 sa.sa_family = AF_UNSPEC;
464 (*ac->ac_if.if_output)( &ac->ac_if, m, &sa, NULL); /* XXX */
469 aarptfree( struct aarptab *aat)
473 m_freem( aat->aat_hold );
474 aat->aat_hold = NULL;
475 aat->aat_timer = aat->aat_flags = 0;
476 aat->aat_ataddr.s_net = 0;
477 aat->aat_ataddr.s_node = 0;
482 struct at_addr *addr;
486 struct aarptab *aat, *aato = NULL;
487 static int first = 1;
491 aarptimer_ch = timeout( aarptimer, (caddr_t)0, hz );
493 aat = &aarptab[ AARPTAB_HASH( *addr ) * AARPTAB_BSIZ ];
494 for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) {
495 if ( aat->aat_flags == 0 )
497 if ( aat->aat_flags & ATF_PERM )
499 if ((int) aat->aat_timer > oldest ) {
500 oldest = aat->aat_timer;
509 aat->aat_ataddr = *addr;
510 aat->aat_flags = ATF_INUSE;
516 aarpprobe( void *arg )
518 struct arpcom *ac = arg;
520 struct ether_header *eh;
521 struct ether_aarp *ea;
522 struct at_ifaddr *aa;
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.
533 for (aa = (struct at_ifaddr *)ac->ac_if.if_addrhead.tqh_first; aa;
534 aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
535 if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
536 ( aa->aa_flags & AFA_PROBING )) {
540 if ( aa == NULL ) { /* serious error XXX */
541 printf( "aarpprobe why did this happen?!\n" );
545 if ( aa->aa_probcnt <= 0 ) {
546 aa->aa_flags &= ~AFA_PROBING;
550 aa->aa_ch = timeout( aarpprobe, (caddr_t)ac, hz / 5 );
553 if (( m = m_gethdr( MB_DONTWAIT, MT_DATA )) == NULL ) {
556 m->m_len = sizeof( *ea );
557 m->m_pkthdr.len = sizeof( *ea );
558 MH_ALIGN( m, sizeof( *ea ));
560 ea = mtod( m, struct ether_aarp *);
561 bzero((caddr_t)ea, sizeof( *ea ));
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 ));
571 eh = (struct ether_header *)sa.sa_data;
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 );
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 );
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;
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;
599 printf("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 */
604 sa.sa_len = sizeof( struct sockaddr );
605 sa.sa_family = AF_UNSPEC;
606 (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, NULL); /* XXX */
616 untimeout( aarptimer, 0, 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;