mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
f1d19042b0
and local variables, goto labels, and functions declared but not defined.
466 lines
11 KiB
C
466 lines
11 KiB
C
/*
|
|
* 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
|