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