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