627 lines
16 KiB
C
627 lines
16 KiB
C
/*
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* Copyright (c) 1990,1991 Regents of The University of Michigan.
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* All Rights Reserved.
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*
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* $FreeBSD$
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*/
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#include "opt_atalk.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mac.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#undef s_net
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#include <netinet/if_ether.h>
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#include <netatalk/at.h>
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#include <netatalk/at_var.h>
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#include <netatalk/aarp.h>
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#include <netatalk/phase2.h>
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#include <netatalk/at_extern.h>
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static void aarptfree( struct aarptab *aat);
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static void at_aarpinput( struct arpcom *ac, struct mbuf *m);
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#define AARPTAB_BSIZ 9
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#define AARPTAB_NB 19
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#define AARPTAB_SIZE (AARPTAB_BSIZ * AARPTAB_NB)
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static struct aarptab aarptab[AARPTAB_SIZE];
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#define AARPTAB_HASH(a) \
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((((a).s_net << 8 ) + (a).s_node ) % AARPTAB_NB )
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#define AARPTAB_LOOK(aat,addr) { \
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int n; \
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aat = &aarptab[ AARPTAB_HASH(addr) * AARPTAB_BSIZ ]; \
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for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) \
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if ( aat->aat_ataddr.s_net == (addr).s_net && \
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aat->aat_ataddr.s_node == (addr).s_node ) \
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break; \
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if ( n >= AARPTAB_BSIZ ) \
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aat = 0; \
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}
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#define AARPT_AGE (60 * 1)
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#define AARPT_KILLC 20
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#define AARPT_KILLI 3
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# if !defined( __FreeBSD__ )
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extern u_char etherbroadcastaddr[6];
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# endif /* __FreeBSD__ */
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static u_char atmulticastaddr[ 6 ] = {
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0x09, 0x00, 0x07, 0xff, 0xff, 0xff,
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};
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u_char at_org_code[ 3 ] = {
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0x08, 0x00, 0x07,
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};
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u_char aarp_org_code[ 3 ] = {
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0x00, 0x00, 0x00,
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};
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static struct callout_handle aarptimer_ch =
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CALLOUT_HANDLE_INITIALIZER(&aarptimer_ch);
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static void
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aarptimer(void *ignored)
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{
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struct aarptab *aat;
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int i, s;
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aarptimer_ch = timeout( aarptimer, (caddr_t)0, AARPT_AGE * hz );
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aat = aarptab;
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for ( i = 0; i < AARPTAB_SIZE; i++, aat++ ) {
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if ( aat->aat_flags == 0 || ( aat->aat_flags & ATF_PERM ))
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continue;
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if ( ++aat->aat_timer < (( aat->aat_flags & ATF_COM ) ?
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AARPT_KILLC : AARPT_KILLI ))
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continue;
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s = splimp();
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aarptfree( aat );
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splx( s );
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}
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}
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/*
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* search through the network addresses to find one that includes
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* the given network.. remember to take netranges into
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* consideration.
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*/
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struct at_ifaddr *
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at_ifawithnet(struct sockaddr_at *sat )
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{
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struct at_ifaddr *aa;
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struct sockaddr_at *sat2;
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for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
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sat2 = &(aa->aa_addr);
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if ( sat2->sat_addr.s_net == sat->sat_addr.s_net ) {
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break;
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}
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if( (aa->aa_flags & AFA_PHASE2 )
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&& (ntohs(aa->aa_firstnet) <= ntohs(sat->sat_addr.s_net))
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&& (ntohs(aa->aa_lastnet) >= ntohs(sat->sat_addr.s_net))) {
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break;
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}
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}
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return( aa );
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}
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static void
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aarpwhohas( struct arpcom *ac, struct sockaddr_at *sat )
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{
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struct mbuf *m;
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struct ether_header *eh;
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struct ether_aarp *ea;
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struct at_ifaddr *aa;
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struct llc *llc;
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struct sockaddr sa;
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if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
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return;
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}
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#ifdef MAC
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mac_create_mbuf_linklayer(&ac->ac_if, m);
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#endif
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m->m_len = sizeof( *ea );
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m->m_pkthdr.len = sizeof( *ea );
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MH_ALIGN( m, sizeof( *ea ));
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ea = mtod( m, struct ether_aarp *);
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bzero((caddr_t)ea, sizeof( *ea ));
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ea->aarp_hrd = htons( AARPHRD_ETHER );
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ea->aarp_pro = htons( ETHERTYPE_AT );
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ea->aarp_hln = sizeof( ea->aarp_sha );
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ea->aarp_pln = sizeof( ea->aarp_spu );
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ea->aarp_op = htons( AARPOP_REQUEST );
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bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
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sizeof( ea->aarp_sha ));
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/*
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* We need to check whether the output ethernet type should
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* be phase 1 or 2. We have the interface that we'll be sending
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* the aarp out. We need to find an AppleTalk network on that
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* interface with the same address as we're looking for. If the
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* net is phase 2, generate an 802.2 and SNAP header.
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*/
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if ((aa = at_ifawithnet( sat )) == NULL) {
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m_freem( m );
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return;
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}
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eh = (struct ether_header *)sa.sa_data;
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if ( aa->aa_flags & AFA_PHASE2 ) {
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bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
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sizeof( eh->ether_dhost ));
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eh->ether_type = htons(sizeof(struct llc) + sizeof(struct ether_aarp));
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M_PREPEND( m, sizeof( struct llc ), M_TRYWAIT );
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llc = mtod( m, struct llc *);
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llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
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llc->llc_control = LLC_UI;
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bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
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llc->llc_ether_type = htons( ETHERTYPE_AARP );
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bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
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sizeof( ea->aarp_spnet ));
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bcopy( &sat->sat_addr.s_net, ea->aarp_tpnet,
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sizeof( ea->aarp_tpnet ));
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ea->aarp_spnode = AA_SAT( aa )->sat_addr.s_node;
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ea->aarp_tpnode = sat->sat_addr.s_node;
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} else {
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bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
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sizeof( eh->ether_dhost ));
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eh->ether_type = htons( ETHERTYPE_AARP );
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ea->aarp_spa = AA_SAT( aa )->sat_addr.s_node;
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ea->aarp_tpa = sat->sat_addr.s_node;
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}
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#ifdef NETATALKDEBUG
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printf("aarp: sending request for %u.%u\n",
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ntohs(AA_SAT( aa )->sat_addr.s_net),
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AA_SAT( aa )->sat_addr.s_node);
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#endif /* NETATALKDEBUG */
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sa.sa_len = sizeof( struct sockaddr );
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sa.sa_family = AF_UNSPEC;
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(*ac->ac_if.if_output)(&ac->ac_if,
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m, &sa, NULL); /* XXX NULL should be routing information */
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}
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int
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aarpresolve( ac, m, destsat, desten )
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struct arpcom *ac;
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struct mbuf *m;
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struct sockaddr_at *destsat;
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u_char *desten;
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{
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struct at_ifaddr *aa;
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struct aarptab *aat;
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int s;
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if ( at_broadcast( destsat )) {
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m->m_flags |= M_BCAST;
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if ((aa = at_ifawithnet( destsat )) == NULL) {
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m_freem( m );
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return( 0 );
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}
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if ( aa->aa_flags & AFA_PHASE2 ) {
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bcopy( (caddr_t)atmulticastaddr, (caddr_t)desten,
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sizeof( atmulticastaddr ));
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} else {
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bcopy( (caddr_t)etherbroadcastaddr, (caddr_t)desten,
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sizeof( etherbroadcastaddr ));
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}
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return( 1 );
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}
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s = splimp();
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AARPTAB_LOOK( aat, destsat->sat_addr );
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if ( aat == 0 ) { /* No entry */
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aat = aarptnew( &destsat->sat_addr );
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if ( aat == 0 ) {
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panic( "aarpresolve: no free entry" );
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}
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aat->aat_hold = m;
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aarpwhohas( ac, destsat );
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splx( s );
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return( 0 );
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}
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/* found an entry */
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aat->aat_timer = 0;
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if ( aat->aat_flags & ATF_COM ) { /* entry is COMplete */
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bcopy( (caddr_t)aat->aat_enaddr, (caddr_t)desten,
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sizeof( aat->aat_enaddr ));
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splx( s );
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return( 1 );
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}
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/* entry has not completed */
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if ( aat->aat_hold ) {
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m_freem( aat->aat_hold );
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}
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aat->aat_hold = m;
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aarpwhohas( ac, destsat );
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splx( s );
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return( 0 );
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}
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void
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aarpinput( ac, m )
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struct arpcom *ac;
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struct mbuf *m;
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{
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struct arphdr *ar;
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if ( ac->ac_if.if_flags & IFF_NOARP )
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goto out;
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if ( m->m_len < sizeof( struct arphdr )) {
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goto out;
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}
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ar = mtod( m, struct arphdr *);
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if ( ntohs( ar->ar_hrd ) != AARPHRD_ETHER ) {
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goto out;
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}
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if ( m->m_len < sizeof( struct arphdr ) + 2 * ar->ar_hln +
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2 * ar->ar_pln ) {
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goto out;
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}
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switch( ntohs( ar->ar_pro )) {
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case ETHERTYPE_AT :
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at_aarpinput( ac, m );
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return;
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default:
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break;
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}
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out:
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m_freem( m );
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}
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static void
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at_aarpinput( struct arpcom *ac, struct mbuf *m)
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{
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struct ether_aarp *ea;
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struct at_ifaddr *aa;
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struct aarptab *aat;
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struct ether_header *eh;
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struct llc *llc;
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struct sockaddr_at sat;
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struct sockaddr sa;
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struct at_addr spa, tpa, ma;
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int op;
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u_short net;
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ea = mtod( m, struct ether_aarp *);
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/* Check to see if from my hardware address */
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if ( !bcmp(( caddr_t )ea->aarp_sha, ( caddr_t )ac->ac_enaddr,
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sizeof( ac->ac_enaddr ))) {
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m_freem( m );
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return;
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}
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op = ntohs( ea->aarp_op );
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bcopy( ea->aarp_tpnet, &net, sizeof( net ));
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if ( net != 0 ) { /* should be ATADDR_ANYNET? */
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sat.sat_len = sizeof(struct sockaddr_at);
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sat.sat_family = AF_APPLETALK;
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sat.sat_addr.s_net = net;
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if ((aa = at_ifawithnet( &sat )) == NULL) {
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m_freem( m );
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return;
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}
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bcopy( ea->aarp_spnet, &spa.s_net, sizeof( spa.s_net ));
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bcopy( ea->aarp_tpnet, &tpa.s_net, sizeof( tpa.s_net ));
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} else {
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/*
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* Since we don't know the net, we just look for the first
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* phase 1 address on the interface.
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*/
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for (aa = (struct at_ifaddr *)TAILQ_FIRST(&ac->ac_if.if_addrhead); aa;
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aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
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if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
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( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
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break;
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}
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}
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if ( aa == NULL ) {
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m_freem( m );
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return;
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}
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tpa.s_net = spa.s_net = AA_SAT( aa )->sat_addr.s_net;
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}
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spa.s_node = ea->aarp_spnode;
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tpa.s_node = ea->aarp_tpnode;
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ma.s_net = AA_SAT( aa )->sat_addr.s_net;
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ma.s_node = AA_SAT( aa )->sat_addr.s_node;
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/*
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* This looks like it's from us.
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*/
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if ( spa.s_net == ma.s_net && spa.s_node == ma.s_node ) {
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if ( aa->aa_flags & AFA_PROBING ) {
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/*
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* We're probing, someone either responded to our probe, or
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* probed for the same address we'd like to use. Change the
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* address we're probing for.
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*/
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untimeout( aarpprobe, ac, aa->aa_ch );
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wakeup( aa );
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m_freem( m );
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return;
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} else if ( op != AARPOP_PROBE ) {
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/*
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* This is not a probe, and we're not probing. This means
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* that someone's saying they have the same source address
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* as the one we're using. Get upset...
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*/
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log( LOG_ERR,
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"aarp: duplicate AT address!! %x:%x:%x:%x:%x:%x\n",
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ea->aarp_sha[ 0 ], ea->aarp_sha[ 1 ], ea->aarp_sha[ 2 ],
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ea->aarp_sha[ 3 ], ea->aarp_sha[ 4 ], ea->aarp_sha[ 5 ]);
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m_freem( m );
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return;
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}
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}
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AARPTAB_LOOK( aat, spa );
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if ( aat ) {
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if ( op == AARPOP_PROBE ) {
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/*
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* Someone's probing for spa, dealocate the one we've got,
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* so that if the prober keeps the address, we'll be able
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* to arp for him.
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*/
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aarptfree( aat );
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m_freem( m );
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return;
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}
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bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
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sizeof( ea->aarp_sha ));
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aat->aat_flags |= ATF_COM;
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if ( aat->aat_hold ) {
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struct mbuf *mhold = aat->aat_hold;
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aat->aat_hold = NULL;
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sat.sat_len = sizeof(struct sockaddr_at);
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sat.sat_family = AF_APPLETALK;
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sat.sat_addr = spa;
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(*ac->ac_if.if_output)( &ac->ac_if, mhold,
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(struct sockaddr *)&sat, NULL); /* XXX */
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}
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} else if ((tpa.s_net == ma.s_net)
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&& (tpa.s_node == ma.s_node)
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&& (op != AARPOP_PROBE)
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&& ((aat = aarptnew( &spa )) != NULL)) {
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bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )aat->aat_enaddr,
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sizeof( ea->aarp_sha ));
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aat->aat_flags |= ATF_COM;
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}
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/*
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* Don't respond to responses, and never respond if we're
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* still probing.
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*/
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if ( tpa.s_net != ma.s_net || tpa.s_node != ma.s_node ||
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op == AARPOP_RESPONSE || ( aa->aa_flags & AFA_PROBING )) {
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m_freem( m );
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return;
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}
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bcopy(( caddr_t )ea->aarp_sha, ( caddr_t )ea->aarp_tha,
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sizeof( ea->aarp_sha ));
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bcopy(( caddr_t )ac->ac_enaddr, ( caddr_t )ea->aarp_sha,
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sizeof( ea->aarp_sha ));
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/* XXX */
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eh = (struct ether_header *)sa.sa_data;
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bcopy(( caddr_t )ea->aarp_tha, ( caddr_t )eh->ether_dhost,
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sizeof( eh->ether_dhost ));
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if ( aa->aa_flags & AFA_PHASE2 ) {
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eh->ether_type = htons( sizeof( struct llc ) +
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sizeof( struct ether_aarp ));
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M_PREPEND( m, sizeof( struct llc ), M_DONTWAIT );
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if ( m == NULL ) {
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return;
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}
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llc = mtod( m, struct llc *);
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llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
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llc->llc_control = LLC_UI;
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bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
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llc->llc_ether_type = htons( ETHERTYPE_AARP );
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bcopy( ea->aarp_spnet, ea->aarp_tpnet, sizeof( ea->aarp_tpnet ));
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bcopy( &ma.s_net, ea->aarp_spnet, sizeof( ea->aarp_spnet ));
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} else {
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eh->ether_type = htons( ETHERTYPE_AARP );
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}
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ea->aarp_tpnode = ea->aarp_spnode;
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ea->aarp_spnode = ma.s_node;
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ea->aarp_op = htons( AARPOP_RESPONSE );
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sa.sa_len = sizeof( struct sockaddr );
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sa.sa_family = AF_UNSPEC;
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(*ac->ac_if.if_output)( &ac->ac_if, m, &sa, NULL); /* XXX */
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return;
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}
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static void
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aarptfree( struct aarptab *aat)
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{
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if ( aat->aat_hold )
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m_freem( aat->aat_hold );
|
|
aat->aat_hold = NULL;
|
|
aat->aat_timer = aat->aat_flags = 0;
|
|
aat->aat_ataddr.s_net = 0;
|
|
aat->aat_ataddr.s_node = 0;
|
|
}
|
|
|
|
struct aarptab *
|
|
aarptnew( addr )
|
|
struct at_addr *addr;
|
|
{
|
|
int n;
|
|
int oldest = -1;
|
|
struct aarptab *aat, *aato = NULL;
|
|
static int first = 1;
|
|
|
|
if ( first ) {
|
|
first = 0;
|
|
aarptimer_ch = timeout( aarptimer, (caddr_t)0, hz );
|
|
}
|
|
aat = &aarptab[ AARPTAB_HASH( *addr ) * AARPTAB_BSIZ ];
|
|
for ( n = 0; n < AARPTAB_BSIZ; n++, aat++ ) {
|
|
if ( aat->aat_flags == 0 )
|
|
goto out;
|
|
if ( aat->aat_flags & ATF_PERM )
|
|
continue;
|
|
if ((int) aat->aat_timer > oldest ) {
|
|
oldest = aat->aat_timer;
|
|
aato = aat;
|
|
}
|
|
}
|
|
if ( aato == NULL )
|
|
return( NULL );
|
|
aat = aato;
|
|
aarptfree( aat );
|
|
out:
|
|
aat->aat_ataddr = *addr;
|
|
aat->aat_flags = ATF_INUSE;
|
|
return( aat );
|
|
}
|
|
|
|
|
|
void
|
|
aarpprobe( void *arg )
|
|
{
|
|
struct arpcom *ac = arg;
|
|
struct mbuf *m;
|
|
struct ether_header *eh;
|
|
struct ether_aarp *ea;
|
|
struct at_ifaddr *aa;
|
|
struct llc *llc;
|
|
struct sockaddr sa;
|
|
|
|
/*
|
|
* We need to check whether the output ethernet type should
|
|
* be phase 1 or 2. We have the interface that we'll be sending
|
|
* the aarp out. We need to find an AppleTalk network on that
|
|
* interface with the same address as we're looking for. If the
|
|
* net is phase 2, generate an 802.2 and SNAP header.
|
|
*/
|
|
for (aa = (struct at_ifaddr *)TAILQ_FIRST(&ac->ac_if.if_addrhead); aa;
|
|
aa = (struct at_ifaddr *)aa->aa_ifa.ifa_link.tqe_next) {
|
|
if ( AA_SAT( aa )->sat_family == AF_APPLETALK &&
|
|
( aa->aa_flags & AFA_PROBING )) {
|
|
break;
|
|
}
|
|
}
|
|
if ( aa == NULL ) { /* serious error XXX */
|
|
printf( "aarpprobe why did this happen?!\n" );
|
|
return;
|
|
}
|
|
|
|
if ( aa->aa_probcnt <= 0 ) {
|
|
aa->aa_flags &= ~AFA_PROBING;
|
|
wakeup( aa );
|
|
return;
|
|
} else {
|
|
aa->aa_ch = timeout( aarpprobe, (caddr_t)ac, hz / 5 );
|
|
}
|
|
|
|
if (( m = m_gethdr( M_DONTWAIT, MT_DATA )) == NULL ) {
|
|
return;
|
|
}
|
|
#ifdef MAC
|
|
mac_create_mbuf_linklayer(&ac->ac_if, m);
|
|
#endif
|
|
m->m_len = sizeof( *ea );
|
|
m->m_pkthdr.len = sizeof( *ea );
|
|
MH_ALIGN( m, sizeof( *ea ));
|
|
|
|
ea = mtod( m, struct ether_aarp *);
|
|
bzero((caddr_t)ea, sizeof( *ea ));
|
|
|
|
ea->aarp_hrd = htons( AARPHRD_ETHER );
|
|
ea->aarp_pro = htons( ETHERTYPE_AT );
|
|
ea->aarp_hln = sizeof( ea->aarp_sha );
|
|
ea->aarp_pln = sizeof( ea->aarp_spu );
|
|
ea->aarp_op = htons( AARPOP_PROBE );
|
|
bcopy((caddr_t)ac->ac_enaddr, (caddr_t)ea->aarp_sha,
|
|
sizeof( ea->aarp_sha ));
|
|
|
|
eh = (struct ether_header *)sa.sa_data;
|
|
|
|
if ( aa->aa_flags & AFA_PHASE2 ) {
|
|
bcopy((caddr_t)atmulticastaddr, (caddr_t)eh->ether_dhost,
|
|
sizeof( eh->ether_dhost ));
|
|
eh->ether_type = htons( sizeof( struct llc ) +
|
|
sizeof( struct ether_aarp ));
|
|
M_PREPEND( m, sizeof( struct llc ), M_TRYWAIT );
|
|
llc = mtod( m, struct llc *);
|
|
llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
|
|
llc->llc_control = LLC_UI;
|
|
bcopy( aarp_org_code, llc->llc_org_code, sizeof( aarp_org_code ));
|
|
llc->llc_ether_type = htons( ETHERTYPE_AARP );
|
|
|
|
bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_spnet,
|
|
sizeof( ea->aarp_spnet ));
|
|
bcopy( &AA_SAT( aa )->sat_addr.s_net, ea->aarp_tpnet,
|
|
sizeof( ea->aarp_tpnet ));
|
|
ea->aarp_spnode = ea->aarp_tpnode = AA_SAT( aa )->sat_addr.s_node;
|
|
} else {
|
|
bcopy((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
|
|
sizeof( eh->ether_dhost ));
|
|
eh->ether_type = htons( ETHERTYPE_AARP );
|
|
ea->aarp_spa = ea->aarp_tpa = AA_SAT( aa )->sat_addr.s_node;
|
|
}
|
|
|
|
#ifdef NETATALKDEBUG
|
|
printf("aarp: sending probe for %u.%u\n",
|
|
ntohs(AA_SAT( aa )->sat_addr.s_net),
|
|
AA_SAT( aa )->sat_addr.s_node);
|
|
#endif /* NETATALKDEBUG */
|
|
|
|
sa.sa_len = sizeof( struct sockaddr );
|
|
sa.sa_family = AF_UNSPEC;
|
|
(*ac->ac_if.if_output)(&ac->ac_if, m, &sa, NULL); /* XXX */
|
|
aa->aa_probcnt--;
|
|
}
|
|
|
|
void
|
|
aarp_clean(void)
|
|
{
|
|
struct aarptab *aat;
|
|
int i;
|
|
|
|
untimeout( aarptimer, 0, aarptimer_ch );
|
|
for ( i = 0, aat = aarptab; i < AARPTAB_SIZE; i++, aat++ ) {
|
|
if ( aat->aat_hold ) {
|
|
m_freem( aat->aat_hold );
|
|
aat->aat_hold = NULL;
|
|
}
|
|
}
|
|
}
|