mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-20 11:11:24 +00:00
a7320549ac
Label link layer mbufs as they are created for transmission, check mbufs before delivering them to sockets, label mbufs as they are created from sockets, and preserve mbuf labels if mbufs are copied. Obtained from: TrustedBSD Project Sponsored by: DARPA, NAI Labs
486 lines
12 KiB
C
486 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 "opt_mac.h"
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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/mac.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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#ifdef MAC
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if (mac_check_socket_deliver(ddp->ddp_socket, m) != 0) {
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m_freem( m );
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return;
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}
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#endif
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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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