146686Sbrian/*- 246686Sbrian * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org> 346686Sbrian * All rights reserved. 446686Sbrian * 546686Sbrian * Redistribution and use in source and binary forms, with or without 646686Sbrian * modification, are permitted provided that the following conditions 746686Sbrian * are met: 846686Sbrian * 1. Redistributions of source code must retain the above copyright 946686Sbrian * notice, this list of conditions and the following disclaimer. 1046686Sbrian * 2. Redistributions in binary form must reproduce the above copyright 1146686Sbrian * notice, this list of conditions and the following disclaimer in the 1246686Sbrian * documentation and/or other materials provided with the distribution. 1346686Sbrian * 1446686Sbrian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1546686Sbrian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1646686Sbrian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1746686Sbrian * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1846686Sbrian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1946686Sbrian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2046686Sbrian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2146686Sbrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2246686Sbrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2346686Sbrian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2446686Sbrian * SUCH DAMAGE. 2546686Sbrian * 2650479Speter * $FreeBSD$ 2746686Sbrian */ 2846686Sbrian 2946686Sbrian#include <sys/types.h> 3046686Sbrian 3146686Sbrian#include <stdio.h> 3246686Sbrian#include <termios.h> 3346686Sbrian 3446686Sbrian#include "defs.h" 3546686Sbrian#include "layer.h" 3646686Sbrian#include "timer.h" 3746686Sbrian#include "fsm.h" 3846686Sbrian#include "log.h" 3946686Sbrian#include "mbuf.h" 4046686Sbrian#include "acf.h" 4146686Sbrian#include "proto.h" 4246686Sbrian#include "throughput.h" 4346686Sbrian#include "lqr.h" 4446686Sbrian#include "hdlc.h" 4563484Sbrian#include "lcp.h" 4646686Sbrian#include "ccp.h" 4746686Sbrian#include "link.h" 4846686Sbrian#include "descriptor.h" 4946686Sbrian#include "async.h" 5046686Sbrian#include "physical.h" 5146686Sbrian 5246686Sbrianint 5346686Sbrianacf_WrapperOctets(struct lcp *lcp, u_short proto) 5446686Sbrian{ 5546686Sbrian return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0; 5646686Sbrian} 5746686Sbrian 5846686Sbrianstatic struct mbuf * 59134789Sbrianacf_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp, 60134789Sbrian int pri __unused, u_short *proto) 6146686Sbrian{ 6246686Sbrian const u_char cp[2] = { HDLC_ADDR, HDLC_UI }; 6346686Sbrian 6447695Sbrian if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0) { 6554912Sbrian bp = m_prepend(bp, cp, 2, 0); 6654912Sbrian m_settype(bp, MB_ACFOUT); 6747695Sbrian } 6846686Sbrian 6946686Sbrian return bp; 7046686Sbrian} 7146686Sbrian 7246686Sbrianstatic struct mbuf * 73134789Sbrianacf_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp, 74134789Sbrian u_short *proto __unused) 7546686Sbrian{ 7646686Sbrian struct physical *p = link2physical(l); 7746686Sbrian u_char cp[2]; 7846686Sbrian 7946686Sbrian if (!p) { 8046686Sbrian log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n"); 8146686Sbrian return bp; 8246686Sbrian } 8346686Sbrian 8446686Sbrian if (mbuf_View(bp, cp, 2) == 2) { 8546686Sbrian if (!p->link.lcp.want_acfcomp) { 8646686Sbrian /* We expect the packet not to be compressed */ 8746686Sbrian bp = mbuf_Read(bp, cp, 2); 8846686Sbrian if (cp[0] != HDLC_ADDR) { 89131327Sbrian p->hdlc.lqm.ifInErrors++; 9046686Sbrian p->hdlc.stats.badaddr++; 9146686Sbrian log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]); 9254912Sbrian m_freem(bp); 9346686Sbrian return NULL; 9446686Sbrian } 9546686Sbrian if (cp[1] != HDLC_UI) { 96131327Sbrian p->hdlc.lqm.ifInErrors++; 9746686Sbrian p->hdlc.stats.badcommand++; 9846686Sbrian log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]); 9954912Sbrian m_freem(bp); 10046686Sbrian return NULL; 10146686Sbrian } 10254912Sbrian m_settype(bp, MB_ACFIN); 10346686Sbrian } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { 10446686Sbrian /* 10546686Sbrian * We can receive compressed packets, but the peer still sends 10646686Sbrian * uncompressed packets (or maybe this is a PROTO_LCP packet) ! 10746686Sbrian */ 10846686Sbrian bp = mbuf_Read(bp, cp, 2); 10954912Sbrian m_settype(bp, MB_ACFIN); 11046686Sbrian } 11146686Sbrian } 11246686Sbrian 11346686Sbrian return bp; 11446686Sbrian} 11546686Sbrian 11646686Sbrianstruct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull }; 117