112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
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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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* $Id:$
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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 "defs.h"
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#include "layer.h"
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#include "timer.h"
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#include "fsm.h"
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#include "log.h"
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#include "mbuf.h"
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#include "acf.h"
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#include "proto.h"
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#include "lcp.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 "ccp.h"
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#include "link.h"
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#include "descriptor.h"
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#include "async.h"
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#include "physical.h"
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int
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acf_WrapperOctets(struct lcp *lcp, u_short proto)
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{
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return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0;
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}
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static struct mbuf *
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acf_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp,
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int pri, u_short *proto)
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{
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const u_char cp[2] = { HDLC_ADDR, HDLC_UI };
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if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0)
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bp = mbuf_Prepend(bp, cp, 2, 0);
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return bp;
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}
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static struct mbuf *
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acf_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, u_short *proto)
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{
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struct physical *p = link2physical(l);
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u_char cp[2];
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if (!p) {
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log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n");
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return bp;
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}
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if (mbuf_View(bp, cp, 2) == 2) {
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if (!p->link.lcp.want_acfcomp) {
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/* We expect the packet not to be compressed */
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bp = mbuf_Read(bp, cp, 2);
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if (cp[0] != HDLC_ADDR) {
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p->hdlc.lqm.SaveInErrors++;
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p->hdlc.stats.badaddr++;
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log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]);
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mbuf_Free(bp);
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return NULL;
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}
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if (cp[1] != HDLC_UI) {
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p->hdlc.lqm.SaveInErrors++;
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p->hdlc.stats.badcommand++;
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log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]);
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mbuf_Free(bp);
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return NULL;
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}
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} else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) {
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/*
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* We can receive compressed packets, but the peer still sends
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* uncompressed packets (or maybe this is a PROTO_LCP packet) !
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*/
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bp = mbuf_Read(bp, cp, 2);
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}
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}
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return bp;
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}
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struct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull };
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