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HardenedBSD/sys/netatalk/ddp_input.c
Bruce Evans f313170d3c Updated #includes to 4.4Lite style.
1996-09-10 08:32:01 +00:00

373 lines
8.4 KiB
C
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/*
* Copyright (c) 1990,1994 Regents of The University of Michigan.
* All Rights Reserved. See COPYRIGHT.
*/
#include <sys/types.h>
#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 <sys/syslog.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#include <netatalk/endian.h>
#include <netatalk/ddp.h>
#include <netatalk/ddp_var.h>
#include <netatalk/at_extern.h>
int ddp_forward = 1;
int ddp_firewall = 0;
extern int ddp_cksum;
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;
struct at_ifaddr *aa;
int s;
for (;;) {
s = splimp();
IF_DEQUEUE( &atintrq2, m );
splx( s );
if ( m == 0 ) { /* no more queued packets */
break;
}
ifp = m->m_pkthdr.rcvif;
for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp && ( aa->aa_flags & AFA_PHASE2 )) {
break;
}
}
if ( aa == NULL ) { /* ifp not an appletalk interface */
m_freem( m );
continue;
}
ddp_input( m, ifp, (struct elaphdr *)NULL, 2 );
}
for (;;) {
s = splimp();
IF_DEQUEUE( &atintrq1, m );
splx( s );
if ( m == 0 ) { /* no more queued packets */
break;
}
ifp = m->m_pkthdr.rcvif;
for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp && ( aa->aa_flags & AFA_PHASE2 ) == 0 ) {
break;
}
}
if ( aa == NULL ) { /* ifp not an appletalk interface */
m_freem( m );
continue;
}
if ( m->m_len < SZ_ELAPHDR &&
(( m = m_pullup( m, SZ_ELAPHDR )) == 0 )) {
ddpstat.ddps_tooshort++;
continue;
}
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);
struct route forwro;
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 ));
if ( elh ) {
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;
for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
if ( aa->aa_ifp == ifp && ( aa->aa_flags & AFA_PHASE2 ) == 0 &&
( AA_SAT( aa )->sat_addr.s_node == to.sat_addr.s_node ||
to.sat_addr.s_node == ATADDR_BCAST )) {
break;
}
}
if ( aa == NULL ) {
m_freem( m );
return;
}
} else {
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 ) {
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 &&
( AA_SAT( aa )->sat_addr.s_node == to.sat_addr.s_node ||
to.sat_addr.s_node == ATADDR_BCAST ||
( ifp->if_flags & IFF_LOOPBACK ))) {
break;
}
}
} else {
for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
if ( to.sat_addr.s_net == aa->aa_firstnet &&
to.sat_addr.s_node == 0 ) {
break;
}
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 ) < ntohs( 0xff00 ) ||
ntohs( to.sat_addr.s_net ) > ntohs( 0xfffe ))) {
continue;
}
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 );
}
/*
* XXX Should we deliver broadcasts locally, also, or rely on the
* link layer to give us a copy? For the moment, the latter.
*/
if ( aa == NULL || ( to.sat_addr.s_node == ATADDR_BCAST &&
aa->aa_ifp != ifp && ( ifp->if_flags & IFF_LOOPBACK ) == 0 )) {
if ( ddp_forward == 0 ) {
m_freem( m );
return;
}
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 ( 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 ( to.sat_addr.s_net != satosat( &forwro.ro_dst )->sat_addr.s_net &&
ddpe.deh_hops == DDP_MAXHOPS ) {
m_freem( m );
return;
}
if ( ddp_firewall &&
( forwro.ro_rt == NULL || forwro.ro_rt->rt_ifp != ifp )) {
m_freem( m );
return;
}
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;
}
from.sat_len = sizeof( struct sockaddr_at );
from.sat_family = AF_APPLETALK;
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 ));
}
if (( ddp = ddp_search( &from, &to, aa )) == NULL ) {
m_freem( m );
return;
}
if ( sbappendaddr( &ddp->ddp_socket->so_rcv, (struct sockaddr *)&from,
m, (struct mbuf *)0 ) == 0 ) {
ddpstat.ddps_nosockspace++;
m_freem( m );
return;
}
sorwakeup( ddp->ddp_socket );
}
#if 0
#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
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