+++ /dev/null
-/*
- * $Id: ddp_output.c,v 1.4 2002-01-04 04:45:49 sibaz Exp $
- *
- * Copyright (c) 1990,1991 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/errno.h>
-#include <atalk/logger.h>
-
-#include <net/if.h>
-#include <net/route.h>
-
-#include <netinet/in.h>
-#undef s_net
-#include <netinet/if_ether.h>
-
-#include "at.h"
-#include "at_var.h"
-#include "endian.h"
-#include "ddp.h"
-#include "ddp_var.h"
-
-u_short at_cksum();
-int ddp_cksum = 1;
-
-ddp_output( ddp, m )
- struct ddpcb *ddp;
- struct mbuf *m;
-{
-#ifndef BSD4_4
- struct mbuf *m0;
- int len;
-#endif /* ! BSD4_4 */
- struct ifnet *ifp;
- struct at_ifaddr *aa = NULL;
- struct ddpehdr *deh;
- u_short net;
-
-#ifdef BSD4_4
- M_PREPEND( m, sizeof( struct ddpehdr ), M_WAIT );
-#else /* BSD4_4 */
- for ( len = 0, m0 = m; m; m = m->m_next ) {
- len += m->m_len;
- }
- MGET( m, M_WAIT, MT_HEADER );
- if ( m == 0 ) {
- m_freem( m0 );
- return( ENOBUFS );
- }
- m->m_next = m0;
-#endif /* BSD4_4 */
-
-#ifndef BSD4_4
-# define align(a) (((a)+3)&0xfc)
- m->m_off = MMINOFF + align( SZ_ELAPHDR );
- m->m_len = sizeof( struct ddpehdr );
-#endif /* ! BSD4_4 */
-
- deh = mtod( m, struct ddpehdr *);
- deh->deh_pad = 0;
- deh->deh_hops = 0;
-
-#ifdef BSD4_4
- deh->deh_len = m->m_pkthdr.len;
-#else /* BSD4_4 */
- deh->deh_len = len + sizeof( struct ddpehdr );
-#endif /* BSD4_4 */
-
- deh->deh_dnet = ddp->ddp_fsat.sat_addr.s_net;
- deh->deh_dnode = ddp->ddp_fsat.sat_addr.s_node;
- deh->deh_dport = ddp->ddp_fsat.sat_port;
- deh->deh_snet = ddp->ddp_lsat.sat_addr.s_net;
- deh->deh_snode = ddp->ddp_lsat.sat_addr.s_node;
- deh->deh_sport = ddp->ddp_lsat.sat_port;
-
- /*
- * The checksum calculation is done after all of the other bytes have
- * been filled in.
- */
- if ( ddp_cksum ) {
- deh->deh_sum = at_cksum( m, sizeof( int ));
- } else {
- deh->deh_sum = 0;
- }
- deh->deh_bytes = htonl( deh->deh_bytes );
-
- return( ddp_route( m, &ddp->ddp_route ));
-}
-
- u_short
-at_cksum( m, skip )
- struct mbuf *m;
- int skip;
-{
- u_char *data, *end;
- u_int32_t cksum = 0;
-
- for (; m; m = m->m_next ) {
- for ( data = mtod( m, u_char * ), end = data + m->m_len; data < end;
- data++ ) {
- if ( skip ) {
- skip--;
- continue;
- }
- cksum = ( cksum + *data ) << 1;
- if ( cksum & 0x00010000 ) {
- cksum++;
- }
- cksum &= 0x0000ffff;
- }
- }
-
- if ( cksum == 0 ) {
- cksum = 0x0000ffff;
- }
- return( (u_short)cksum );
-}
-
-ddp_route( m, ro )
- struct mbuf *m;
- struct route *ro;
-{
- struct sockaddr_at gate;
- struct elaphdr *elh;
- struct mbuf *m0;
- struct at_ifaddr *aa = NULL;
- struct ifnet *ifp;
- int mlen;
- u_short net;
-
- if ( ro->ro_rt && ( ifp = ro->ro_rt->rt_ifp )) {
-#ifdef BSD4_4
- net = satosat( ro->ro_rt->rt_gateway )->sat_addr.s_net;
-#else /* BSD4_4 */
- net = satosat( &ro->ro_rt->rt_gateway )->sat_addr.s_net;
-#endif /* BSD4_4 */
- for ( aa = at_ifaddr; aa; aa = aa->aa_next ) {
- if ( aa->aa_ifp == ifp &&
- ntohs( net ) >= ntohs( aa->aa_firstnet ) &&
- ntohs( net ) <= ntohs( aa->aa_lastnet )) {
- break;
- }
- }
- }
- if ( aa == NULL ) {
- m_freem( m );
- return( EINVAL );
- }
-
- /*
- * There are several places in the kernel where data is added to
- * an mbuf without ensuring that the mbuf pointer is aligned.
- * This is bad for transition routing, since phase 1 and phase 2
- * packets end up poorly aligned due to the three byte elap header.
- */
- if ( aa->aa_flags & AFA_PHASE2 ) {
- for ( mlen = 0, m0 = m; m0; m0 = m0->m_next ) {
- mlen += m0->m_len;
- }
- if (( m = m_pullup( m, MIN( MLEN, mlen ))) == 0 ) {
- return( ENOBUFS );
- }
- } else {
-# ifdef notdef
-#ifdef BSD4_4
- M_PREPEND( m, SZ_ELAPHDR, M_DONTWAIT );
- if ( m == NULL ) {
- return( ENOBUFS );
- }
-#else /* BSD4_4 */
- m->m_off -= SZ_ELAPHDR;
- m->m_len += SZ_ELAPHDR;
-#endif /* BSD4_4 */
-# endif /* notdef */
-
- MGET( m0, M_WAIT, MT_HEADER );
- if ( m0 == 0 ) {
- m_freem( m );
- return( ENOBUFS );
- }
- m0->m_next = m;
- m0->m_off = MMINOFF + align( sizeof( struct ether_header ));
- m0->m_len = SZ_ELAPHDR;
- m = m0;
-
- elh = mtod( m, struct elaphdr *);
- elh->el_snode = satosat( &aa->aa_addr )->sat_addr.s_node;
- elh->el_type = ELAP_DDPEXTEND;
- if ( ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) >=
- ntohs( aa->aa_firstnet ) &&
- ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) <=
- ntohs( aa->aa_lastnet )) {
- elh->el_dnode = satosat( &ro->ro_dst )->sat_addr.s_node;
- } else {
-#ifdef BSD4_4
- elh->el_dnode = satosat( ro->ro_rt->rt_gateway )->sat_addr.s_node;
-#else /* BSD4_4 */
- elh->el_dnode = satosat( &ro->ro_rt->rt_gateway )->sat_addr.s_node;
-#endif /* BSD4_4 */
- }
- }
-
- if ( ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) >=
- ntohs( aa->aa_firstnet ) &&
- ntohs( satosat( &ro->ro_dst )->sat_addr.s_net ) <=
- ntohs( aa->aa_lastnet )) {
- gate = *satosat( &ro->ro_dst );
- } else {
-#ifdef BSD4_4
- gate = *satosat( ro->ro_rt->rt_gateway );
-#else /* BSD4_4 */
- gate = *satosat( &ro->ro_rt->rt_gateway );
-#endif /* BSD4_4 */
- }
- ro->ro_rt->rt_use++;
-
-#ifdef ultrix
- /*
- * SAIEW: We can't make changes to net/if_loop.c, so we don't route
- * further than this: if it's going to go through the lookback,
- * short-circuit to ddp_input(). Who needs queuing?
- *
- * Note: Passing NULL for the elaphdr is cool, since we'll only ever
- * try to send long form ddp throught the loopback.
- */
- if ( ifp->if_flags & IFF_LOOPBACK ) {
-#ifdef notdef
- m->m_off += SZ_ELAPHDR;
- m->m_len -= SZ_ELAPHDR;
-#endif /* notdef */
- ddp_input( m, ifp, (struct elaphdr *)NULL, 2 );
- return( 0 );
- }
-#endif /* ultrix */
-
-#ifdef _IBMR2
- /*
- * We can't make changes to the interface routines on RS6ks, and
- * they don't provide hooks for if_output, so we just resolve
- * our address here, and pass the packet as a raw ethernet packet.
- * This doesn't work particularly well, if we aren't *on* ethernet,
- * but it's ok for the moment.
- */
- if ( ! ( ifp->if_flags & IFF_LOOPBACK )) {
- struct ether_header eh;
-
- if ( !aarpresolve(( struct arpcom *)ifp, m,
- &gate, eh.ether_dhost )) {
- return( 0 );
- }
- eh.ether_type = htons( ETHERTYPE_AT );
- gate.sat_family = AF_UNSPEC;
- bcopy( &eh, (*(struct sockaddr *)&gate).sa_data,
- sizeof( (*(struct sockaddr *)&gate).sa_data ));
- }
-#endif /* _IBMR2 */
- return((*ifp->if_output)( ifp, m, &gate ));
-}
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