476 lines
12 KiB
C
476 lines
12 KiB
C
/*
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* Copyright (c) 1990,1994 Regents of The University of Michigan.
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* All Rights Reserved. See COPYRIGHT.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sx.h>
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#include <sys/systm.h>
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#include <net/if.h>
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#include <net/intrq.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <netatalk/at.h>
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#include <netatalk/at_var.h>
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#include <netatalk/ddp.h>
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#include <netatalk/ddp_var.h>
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#include <netatalk/at_extern.h>
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static volatile int ddp_forward = 1;
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static volatile int ddp_firewall = 0;
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static struct ddpstat ddpstat;
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static struct route forwro;
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static void ddp_input(struct mbuf *, struct ifnet *, struct elaphdr *, int);
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/*
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* Could probably merge these two code segments a little better...
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*/
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static void
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atintr( void )
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{
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struct elaphdr *elhp, elh;
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struct ifnet *ifp;
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struct mbuf *m;
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int s;
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/*
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* First pull off all the phase 2 packets.
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*/
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for (;;) {
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s = splimp();
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IF_DEQUEUE( &atintrq2, m );
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splx( s );
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if ( m == 0 ) { /* no more queued packets */
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break;
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}
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ifp = m->m_pkthdr.rcvif;
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ddp_input( m, ifp, (struct elaphdr *)NULL, 2 );
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}
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/*
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* Then pull off all the phase 1 packets.
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*/
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for (;;) {
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s = splimp();
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IF_DEQUEUE( &atintrq1, m );
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splx( s );
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if ( m == 0 ) { /* no more queued packets */
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break;
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}
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ifp = m->m_pkthdr.rcvif;
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if ( m->m_len < SZ_ELAPHDR &&
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(( m = m_pullup( m, SZ_ELAPHDR )) == 0 )) {
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ddpstat.ddps_tooshort++;
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continue;
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}
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/*
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* this seems a little dubios, but I don't know phase 1 so leave it.
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*/
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elhp = mtod( m, struct elaphdr *);
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m_adj( m, SZ_ELAPHDR );
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if ( elhp->el_type == ELAP_DDPEXTEND ) {
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ddp_input( m, ifp, (struct elaphdr *)NULL, 1 );
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} else {
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bcopy((caddr_t)elhp, (caddr_t)&elh, SZ_ELAPHDR );
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ddp_input( m, ifp, &elh, 1 );
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}
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}
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return;
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}
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static void
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netisr_atalk_setup(void *dummy __unused)
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{
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register_netisr(NETISR_ATALK, atintr);
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}
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SYSINIT(atalk_setup, SI_SUB_CPU, SI_ORDER_ANY, netisr_atalk_setup, NULL);
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static void
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ddp_input( m, ifp, elh, phase )
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struct mbuf *m;
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struct ifnet *ifp;
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struct elaphdr *elh;
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int phase;
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{
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struct sockaddr_at from, to;
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struct ddpshdr *dsh, ddps;
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struct at_ifaddr *aa;
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struct ddpehdr *deh = NULL, ddpe;
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struct ddpcb *ddp;
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int dlen, mlen;
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u_short cksum = 0;
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bzero( (caddr_t)&from, sizeof( struct sockaddr_at ));
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bzero( (caddr_t)&to, sizeof( struct sockaddr_at ));
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if ( elh ) {
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/*
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* Extract the information in the short header.
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* netowrk information is defaulted to ATADDR_ANYNET
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* and node information comes from the elh info.
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* We must be phase 1.
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*/
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ddpstat.ddps_short++;
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if ( m->m_len < sizeof( struct ddpshdr ) &&
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(( m = m_pullup( m, sizeof( struct ddpshdr ))) == 0 )) {
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ddpstat.ddps_tooshort++;
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return;
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}
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dsh = mtod( m, struct ddpshdr *);
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bcopy( (caddr_t)dsh, (caddr_t)&ddps, sizeof( struct ddpshdr ));
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ddps.dsh_bytes = ntohl( ddps.dsh_bytes );
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dlen = ddps.dsh_len;
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to.sat_addr.s_net = ATADDR_ANYNET;
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to.sat_addr.s_node = elh->el_dnode;
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to.sat_port = ddps.dsh_dport;
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from.sat_addr.s_net = ATADDR_ANYNET;
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from.sat_addr.s_node = elh->el_snode;
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from.sat_port = ddps.dsh_sport;
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/*
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* Make sure that we point to the phase1 ifaddr info
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* and that it's valid for this packet.
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*/
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for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
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if ( (aa->aa_ifp == ifp)
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&& ( (aa->aa_flags & AFA_PHASE2) == 0)
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&& ( (to.sat_addr.s_node == AA_SAT( aa )->sat_addr.s_node)
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|| (to.sat_addr.s_node == ATADDR_BCAST))) {
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break;
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}
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}
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/*
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* maybe we got a broadcast not meant for us.. ditch it.
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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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} else {
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/*
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* There was no 'elh' passed on. This could still be
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* either phase1 or phase2.
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* We have a long header, but we may be running on a phase 1 net.
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* Extract out all the info regarding this packet's src & dst.
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*/
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ddpstat.ddps_long++;
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if ( m->m_len < sizeof( struct ddpehdr ) &&
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(( m = m_pullup( m, sizeof( struct ddpehdr ))) == 0 )) {
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ddpstat.ddps_tooshort++;
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return;
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}
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deh = mtod( m, struct ddpehdr *);
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bcopy( (caddr_t)deh, (caddr_t)&ddpe, sizeof( struct ddpehdr ));
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ddpe.deh_bytes = ntohl( ddpe.deh_bytes );
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dlen = ddpe.deh_len;
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if (( cksum = ddpe.deh_sum ) == 0 ) {
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ddpstat.ddps_nosum++;
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}
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from.sat_addr.s_net = ddpe.deh_snet;
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from.sat_addr.s_node = ddpe.deh_snode;
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from.sat_port = ddpe.deh_sport;
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to.sat_addr.s_net = ddpe.deh_dnet;
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to.sat_addr.s_node = ddpe.deh_dnode;
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to.sat_port = ddpe.deh_dport;
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if ( to.sat_addr.s_net == ATADDR_ANYNET ) {
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/*
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* The TO address doesn't specify a net,
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* So by definition it's for this net.
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* Try find ifaddr info with the right phase,
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* the right interface, and either to our node, a broadcast,
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* or looped back (though that SHOULD be covered in the other
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* cases).
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*
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* XXX If we have multiple interfaces, then the first with
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* this node number will match (which may NOT be what we want,
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* but it's probably safe in 99.999% of cases.
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*/
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for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
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if ( phase == 1 && ( aa->aa_flags & AFA_PHASE2 )) {
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continue;
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}
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if ( phase == 2 && ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
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continue;
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}
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if ( (aa->aa_ifp == ifp)
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&& ( (to.sat_addr.s_node == AA_SAT( aa )->sat_addr.s_node)
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|| (to.sat_addr.s_node == ATADDR_BCAST)
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|| (ifp->if_flags & IFF_LOOPBACK))) {
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break;
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}
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}
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} else {
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/*
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* A destination network was given. We just try to find
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* which ifaddr info matches it.
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*/
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for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
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/*
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* This is a kludge. Accept packets that are
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* for any router on a local netrange.
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*/
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if ( to.sat_addr.s_net == aa->aa_firstnet &&
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to.sat_addr.s_node == 0 ) {
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break;
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}
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/*
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* Don't use ifaddr info for which we are totally outside the
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* netrange, and it's not a startup packet.
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* Startup packets are always implicitly allowed on to
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* the next test.
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*/
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if ((( ntohs( to.sat_addr.s_net ) < ntohs( aa->aa_firstnet ))
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|| (ntohs( to.sat_addr.s_net ) > ntohs( aa->aa_lastnet )))
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&& (( ntohs( to.sat_addr.s_net ) < 0xff00)
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|| (ntohs( to.sat_addr.s_net ) > 0xfffe ))) {
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continue;
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}
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/*
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* Don't record a match either if we just don't have a match
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* in the node address. This can have if the interface
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* is in promiscuous mode for example.
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*/
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if (( to.sat_addr.s_node != AA_SAT( aa )->sat_addr.s_node)
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&& (to.sat_addr.s_node != ATADDR_BCAST) ) {
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continue;
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}
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break;
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}
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}
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}
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/*
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* Adjust the length, removing any padding that may have been added
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* at a link layer. We do this before we attempt to forward a packet,
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* possibly on a different media.
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*/
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mlen = m->m_pkthdr.len;
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if ( mlen < dlen ) {
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ddpstat.ddps_toosmall++;
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m_freem( m );
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return;
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}
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if ( mlen > dlen ) {
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m_adj( m, dlen - mlen );
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}
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/*
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* If it aint for a net on any of our interfaces,
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* or it IS for a net on a different interface than it came in on,
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* (and it is not looped back) then consider if we should forward it.
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* As we are not really a router this is a bit cheeky, but it may be
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* useful some day.
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*/
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if ( (aa == NULL)
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|| ( (to.sat_addr.s_node == ATADDR_BCAST)
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&& (aa->aa_ifp != ifp)
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&& (( ifp->if_flags & IFF_LOOPBACK ) == 0 ))) {
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/*
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* If we've explicitly disabled it, don't route anything
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*/
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if ( ddp_forward == 0 ) {
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m_freem( m );
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return;
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}
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/*
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* If the cached forwarding route is still valid, use it.
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*/
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if ( forwro.ro_rt
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&& ( satosat(&forwro.ro_dst)->sat_addr.s_net != to.sat_addr.s_net
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|| satosat(&forwro.ro_dst)->sat_addr.s_node != to.sat_addr.s_node )) {
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RTFREE( forwro.ro_rt );
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forwro.ro_rt = (struct rtentry *)0;
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}
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/*
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* If we don't have a cached one (any more) or it's useless,
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* Then get a new route.
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* XXX this could cause a 'route leak'. check this!
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*/
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if ( forwro.ro_rt == (struct rtentry *)0
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|| forwro.ro_rt->rt_ifp == (struct ifnet *)0 ) {
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forwro.ro_dst.sa_len = sizeof( struct sockaddr_at );
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forwro.ro_dst.sa_family = AF_APPLETALK;
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satosat(&forwro.ro_dst)->sat_addr.s_net = to.sat_addr.s_net;
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satosat(&forwro.ro_dst)->sat_addr.s_node = to.sat_addr.s_node;
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rtalloc(&forwro);
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}
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/*
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* If it's not going to get there on this hop, and it's
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* already done too many hops, then throw it away.
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*/
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if ( (to.sat_addr.s_net != satosat( &forwro.ro_dst )->sat_addr.s_net)
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&& (ddpe.deh_hops == DDP_MAXHOPS) ) {
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m_freem( m );
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return;
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}
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/*
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* A ddp router might use the same interface
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* to forward the packet, which this would not effect.
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* Don't allow packets to cross from one interface to another however.
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*/
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if ( ddp_firewall
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&& ( (forwro.ro_rt == NULL)
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|| (forwro.ro_rt->rt_ifp != ifp))) {
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m_freem( m );
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return;
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}
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/*
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* Adjust the header.
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* If it was a short header then it would have not gotten here,
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* so we can assume there is room to drop the header in.
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* XXX what about promiscuous mode, etc...
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*/
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ddpe.deh_hops++;
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ddpe.deh_bytes = htonl( ddpe.deh_bytes );
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bcopy( (caddr_t)&ddpe, (caddr_t)deh, sizeof( u_short )); /* XXX deh? */
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if ( ddp_route( m, &forwro )) {
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ddpstat.ddps_cantforward++;
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} else {
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ddpstat.ddps_forward++;
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}
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return;
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}
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/*
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* It was for us, and we have an ifaddr to use with it.
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*/
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from.sat_len = sizeof( struct sockaddr_at );
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from.sat_family = AF_APPLETALK;
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/*
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* We are no longer interested in the link layer.
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* so cut it off.
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*/
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if ( elh ) {
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m_adj( m, sizeof( struct ddpshdr ));
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} else {
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if ( ddp_cksum && cksum && cksum != at_cksum( m, sizeof( int ))) {
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ddpstat.ddps_badsum++;
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m_freem( m );
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return;
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}
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m_adj( m, sizeof( struct ddpehdr ));
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}
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/*
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* Search for ddp protocol control blocks that match these
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* addresses.
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*/
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if (( ddp = ddp_search( &from, &to, aa )) == NULL ) {
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m_freem( m );
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return;
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}
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/*
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* If we found one, deliver th epacket to the socket
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*/
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if ( sbappendaddr( &ddp->ddp_socket->so_rcv, (struct sockaddr *)&from,
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m, (struct mbuf *)0 ) == 0 ) {
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/*
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* If the socket is full (or similar error) dump the packet.
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*/
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ddpstat.ddps_nosockspace++;
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m_freem( m );
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return;
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}
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/*
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* And wake up whatever might be waiting for it
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*/
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sorwakeup( ddp->ddp_socket );
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}
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#if 0
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/* As if we haven't got enough of this sort of think floating
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around the kernel :) */
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#define BPXLEN 48
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#define BPALEN 16
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#include <ctype.h>
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char hexdig[] = "0123456789ABCDEF";
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static void
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bprint( char *data, int len )
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{
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char xout[ BPXLEN ], aout[ BPALEN ];
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int i = 0;
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bzero( xout, BPXLEN );
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bzero( aout, BPALEN );
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for ( ;; ) {
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if ( len < 1 ) {
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if ( i != 0 ) {
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printf( "%s\t%s\n", xout, aout );
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}
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printf( "%s\n", "(end)" );
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break;
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}
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xout[ (i*3) ] = hexdig[ ( *data & 0xf0 ) >> 4 ];
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xout[ (i*3) + 1 ] = hexdig[ *data & 0x0f ];
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if ( (u_char)*data < 0x7f && (u_char)*data > 0x20 ) {
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aout[ i ] = *data;
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} else {
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aout[ i ] = '.';
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}
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xout[ (i*3) + 2 ] = ' ';
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i++;
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len--;
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data++;
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if ( i > BPALEN - 2 ) {
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printf( "%s\t%s\n", xout, aout );
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bzero( xout, BPXLEN );
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bzero( aout, BPALEN );
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i = 0;
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continue;
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}
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}
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}
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static void
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m_printm( struct mbuf *m )
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{
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for (; m; m = m->m_next ) {
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bprint( mtod( m, char * ), m->m_len );
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}
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}
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#endif
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