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