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/* $OpenBSD: ddp_output.c,v 1.2 2000/06/16 21:47:15 provos Exp $ */
/*
* Copyright (c) 1990,1991 Regents of The University of Michigan.
* All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation, and that the name of The University
* of Michigan not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. This software is supplied as is without expressed or
* implied warranties of any kind.
*
* Research Systems Unix Group
* The University of Michigan
* c/o Mike Clark
* 535 W. William Street
* Ann Arbor, Michigan
* +1-313-763-0525
* netatalk@itd.umich.edu
*/
/*
* The following is the contents of the COPYRIGHT file from the
* netatalk-1.4a2 distribution, from which this file is derived.
*/
/*
* Copyright (c) 1990,1996 Regents of The University of Michigan.
*
* All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation, and that the name of The University
* of Michigan not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. This software is supplied as is without expressed or
* implied warranties of any kind.
*
* This product includes software developed by the University of
* California, Berkeley and its contributors.
*
* Solaris code is encumbered by the following:
*
* Copyright (C) 1996 by Sun Microsystems Computer Co.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that the above copyright notice appear in all
* copies and that both that copyright notice and this permission
* notice appear in supporting documentation. This software is
* provided "as is" without express or implied warranty.
*
* Research Systems Unix Group
* The University of Michigan
* c/o Wesley Craig
* 535 W. William Street
* Ann Arbor, Michigan
* +1-313-764-2278
* netatalk@umich.edu
*/
/*
* None of the Solaris code mentioned is included in OpenBSD.
* This code also relies heavily on previous effort in FreeBSD and NetBSD.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#undef s_net
#include <netinet/if_ether.h>
#include <machine/endian.h>
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#include <netatalk/ddp.h>
#include <netatalk/ddp_var.h>
#include <netatalk/at_extern.h>
int ddp_output __P(( struct mbuf *, ... ));
u_int16_t at_cksum __P(( struct mbuf *, int ));
int ddp_route __P((struct mbuf *, struct route * ));
int ddp_cksum = 1;
int
#if __STDC__
ddp_output(struct mbuf *m, ...)
#else
ddp_output(m, va_alist)
struct mbuf *m;
va_dcl
#endif
{
struct ddpcb *ddp;
struct ddpehdr *deh;
va_list ap;
va_start(ap, m);
ddp = va_arg(ap, struct ddpcb *);
va_end(ap);
M_PREPEND( m, sizeof( struct ddpehdr ), M_WAIT );
deh = mtod( m, struct ddpehdr *);
deh->deh_pad = 0;
deh->deh_hops = 0;
deh->deh_len = m->m_pkthdr.len;
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_int16_t
at_cksum( m, skip )
struct mbuf *m;
int skip;
{
u_int8_t *data, *end;
u_long cksum = 0;
for (; m; m = m->m_next ) {
for ( data = mtod( m, u_int8_t * ), 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_int16_t)cksum );
}
int
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;
u_int16_t net;
if ( ro->ro_rt && ( ifp = ro->ro_rt->rt_ifp )) {
net = satosat( ro->ro_rt->rt_gateway )->sat_addr.s_net;
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 ) {
if (( m = m_pullup( m, MIN( MHLEN, m->m_pkthdr.len ))) == 0 ) {
return( ENOBUFS );
}
} else {
MGET( m0, M_WAIT, MT_HEADER );
if ( m0 == 0 ) {
m_freem( m );
return( ENOBUFS );
}
m0->m_next = m;
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 {
elh->el_dnode = satosat( ro->ro_rt->rt_gateway )->sat_addr.s_node;
}
}
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 {
gate = *satosat( ro->ro_rt->rt_gateway );
}
ro->ro_rt->rt_use++;
/* XXX The NULL should be a struct rtentry */
return((*ifp->if_output)( ifp, m, (struct sockaddr *) &gate, NULL ));
}
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