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/*-
* Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: proto.c,v 1.1 1999/05/08 11:07:32 brian Exp $
*/
#include <sys/types.h>
#include <stdio.h>
#include <termios.h>
#include "layer.h"
#include "acf.h"
#include "defs.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "mbuf.h"
#include "proto.h"
#include "lcp.h"
#include "throughput.h"
#include "lqr.h"
#include "hdlc.h"
#include "ccp.h"
#include "link.h"
int
proto_WrapperOctets(struct lcp *lcp, u_short proto)
{
return (lcp->his_protocomp && !(proto & 0xff00)) ? 1 : 2;
}
struct mbuf *
proto_Prepend(struct mbuf *bp, u_short proto, unsigned comp, int extra)
{
u_char cp[2];
cp[0] = proto >> 8;
cp[1] = proto & 0xff;
if (comp && cp[0] == 0)
bp = mbuf_Prepend(bp, cp + 1, 1, extra);
else
bp = mbuf_Prepend(bp, cp, 2, extra);
return bp;
}
static struct mbuf *
proto_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp,
int pri, u_short *proto)
{
log_Printf(LogDEBUG, "proto_LayerPush: Using 0x%04x\n", *proto);
bp = proto_Prepend(bp, *proto, l->lcp.his_protocomp,
acf_WrapperOctets(&l->lcp, *proto));
link_ProtocolRecord(l, *proto, PROTO_OUT);
return bp;
}
static struct mbuf *
proto_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp,
u_short *proto)
{
u_char cp[2];
size_t got;
if ((got = mbuf_View(bp, cp, 2)) == 0) {
mbuf_Free(bp);
return NULL;
}
*proto = cp[0];
if (!(*proto & 1)) {
if (got == 1) {
mbuf_Free(bp);
return NULL;
}
bp = mbuf_Read(bp, cp, 2);
*proto = (*proto << 8) | cp[1];
} else
bp = mbuf_Read(bp, cp, 1);
log_Printf(LogDEBUG, "proto_LayerPull: unknown -> 0x%04x\n", *proto);
link_ProtocolRecord(l, *proto, PROTO_IN);
return bp;
}
struct layer protolayer =
{ LAYER_PROTO, "proto", proto_LayerPush, proto_LayerPull };
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