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Sourcecode: netatalk version File versions

ddp_input.c

/*
 * $Id: ddp_input.c,v 1.4 2002/01/04 04:45:48 sibaz Exp $
 *
 * Copyright (c) 1990,1994 Regents of The University of Michigan.
 * All Rights Reserved.  See COPYRIGHT.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <atalk/logger.h>
#include <net/if.h>
#include <net/route.h>
#ifdef _IBMR2
#include <net/spl.h>
#endif /* _IBMR2 */

#include "at.h"
#include "at_var.h"
#include "endian.h"
#include "ddp.h"
#include "ddp_var.h"

int         ddp_forward = 1;
int         ddp_firewall = 0;
extern int  ddp_cksum;
extern u_short    at_cksum();

/*
 * Could probably merge these two code segments a little better...
 */
atintr()
{
    struct elaphdr      *elhp, elh;
    struct ifnet  *ifp;
    struct mbuf         *m;
    struct at_ifaddr    *aa;
    int                 s;

    for (;;) {
#ifndef _IBMR2
      s = splimp();
#endif /* ! _IBMR2 */

#ifdef BSD4_4
      IF_DEQUEUE( &atintrq2, m );
#else /* BSD4_4 */
      IF_DEQUEUEIF( &atintrq2, m, ifp );
#endif /* BSD4_4 */

#ifndef _IBMR2
      splx( s );
#endif /* ! _IBMR2 */

      if ( m == 0 ) {               /* no more queued packets */
          break;
      }

#ifdef BSD4_4
      ifp = m->m_pkthdr.rcvif;
#endif /* BSD4_4 */
      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 (;;) {
#ifndef _IBMR2
      s = splimp();
#endif /* ! _IBMR2 */

#ifdef BSD4_4
      IF_DEQUEUE( &atintrq1, m );
#else /* BSD4_4 */
      IF_DEQUEUEIF( &atintrq1, m, ifp );
#endif /* BSD4_4 */

#ifndef _IBMR2
      splx( s );
#endif /* ! _IBMR2 */

      if ( m == 0 ) {               /* no more queued packets */
          break;
      }

#ifdef BSD4_4
      ifp = m->m_pkthdr.rcvif;
#endif /* BSD4_4 */
      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;
}

struct route      forwro;

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, ddpe;
#ifndef BSD4_4
    struct mbuf         *mp;
#endif /* BSD4_4 */
    struct ddpcb  *ddp;
    int                 dlen, mlen;
    u_short       cksum;

    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 = 0;
      to.sat_addr.s_node = elh->el_dnode;
      to.sat_port = ddps.dsh_dport;
      from.sat_addr.s_net = 0;
      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 == 0 ) {
          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 ) < 0xff00 ||
                  ntohs( to.sat_addr.s_net ) > 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.
     */
#ifdef BSD4_4
    mlen = m->m_pkthdr.len;
#else /* BSD4_4 */
    for ( mlen = 0, mp = m; mp; mp = mp->m_next ) {
      mlen += mp->m_len;
    }
#endif /* BSD4_4 */
    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 )) {
#ifdef ultrix
          rtfree( forwro.ro_rt );
#else /* ultrix */
          RTFREE( forwro.ro_rt );
#endif /* ultrix */
          forwro.ro_rt = (struct rtentry *)0;
      }
      if ( forwro.ro_rt == (struct rtentry *)0 ||
           forwro.ro_rt->rt_ifp == (struct ifnet *)0 ) {
#ifdef BSD4_4
          forwro.ro_dst.sa_len = sizeof( struct sockaddr_at );
#endif /* BSD4_4 */
          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 &&
            forwro.ro_rt->rt_ifp != at_ifaddr->aa_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 ));
      if ( ddp_route( m, &forwro )) {
          ddpstat.ddps_cantforward++;
      } else {
          ddpstat.ddps_forward++;
      }
      return;
    }

#ifdef BSD4_4
    from.sat_len = sizeof( struct sockaddr_at );
#endif /* BSD4_4 */
    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 );
}

m_printm( m )
    struct mbuf   *m;
{
    for (; m; m = m->m_next ) {
      bprint( mtod( m, char * ), m->m_len );
    }
}

#define BPXLEN    48
#define BPALEN    16
#include <ctype.h>
char  hexdig[] = "0123456789ABCDEF";

bprint( data, len )
    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;
      }
    }
}

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