acf.c revision 330449
1295484Semaste/*- 2295484Semaste * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3295484Semaste * 4295484Semaste * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org> 5295484Semaste * All rights reserved. 6295484Semaste * 7295484Semaste * Redistribution and use in source and binary forms, with or without 8295484Semaste * modification, are permitted provided that the following conditions 9295484Semaste * are met: 10295484Semaste * 1. Redistributions of source code must retain the above copyright 11295484Semaste * notice, this list of conditions and the following disclaimer. 12295484Semaste * 2. Redistributions in binary form must reproduce the above copyright 13295484Semaste * notice, this list of conditions and the following disclaimer in the 14295484Semaste * documentation and/or other materials provided with the distribution. 15295484Semaste * 16295484Semaste * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17295484Semaste * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18295484Semaste * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19295484Semaste * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20295484Semaste * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21295484Semaste * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22295484Semaste * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23295484Semaste * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24295484Semaste * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25295484Semaste * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26295484Semaste * SUCH DAMAGE. 27295484Semaste * 28295484Semaste * $FreeBSD: stable/11/usr.sbin/ppp/acf.c 330449 2018-03-05 07:26:05Z eadler $ 29295484Semaste */ 30295484Semaste 31295484Semaste#include <sys/types.h> 32295484Semaste 33295484Semaste#include <stdio.h> 34295484Semaste#include <termios.h> 35295484Semaste 36295484Semaste#include "defs.h" 37295484Semaste#include "layer.h" 38295484Semaste#include "timer.h" 39295484Semaste#include "fsm.h" 40295484Semaste#include "log.h" 41295484Semaste#include "mbuf.h" 42295484Semaste#include "acf.h" 43295484Semaste#include "proto.h" 44295484Semaste#include "throughput.h" 45295484Semaste#include "lqr.h" 46295484Semaste#include "hdlc.h" 47295484Semaste#include "lcp.h" 48295484Semaste#include "ccp.h" 49295484Semaste#include "link.h" 50295484Semaste#include "descriptor.h" 51295484Semaste#include "async.h" 52295484Semaste#include "physical.h" 53295484Semaste 54295484Semasteint 55295484Semasteacf_WrapperOctets(struct lcp *lcp, u_short proto) 56295484Semaste{ 57295484Semaste return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0; 58295484Semaste} 59295484Semaste 60295484Semastestatic struct mbuf * 61295484Semasteacf_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp, 62295484Semaste int pri __unused, u_short *proto) 63295484Semaste{ 64295484Semaste const u_char cp[2] = { HDLC_ADDR, HDLC_UI }; 65295484Semaste 66295484Semaste if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0) { 67295484Semaste bp = m_prepend(bp, cp, 2, 0); 68295484Semaste m_settype(bp, MB_ACFOUT); 69295484Semaste } 70295484Semaste 71295484Semaste return bp; 72295484Semaste} 73295484Semaste 74295484Semastestatic struct mbuf * 75295484Semasteacf_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp, 76295484Semaste u_short *proto __unused) 77295484Semaste{ 78295484Semaste struct physical *p = link2physical(l); 79295484Semaste u_char cp[2]; 80295484Semaste 81295484Semaste if (!p) { 82295484Semaste log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n"); 83295484Semaste return bp; 84295484Semaste } 85295484Semaste 86295484Semaste if (mbuf_View(bp, cp, 2) == 2) { 87295484Semaste if (!p->link.lcp.want_acfcomp) { 88295484Semaste /* We expect the packet not to be compressed */ 89295484Semaste bp = mbuf_Read(bp, cp, 2); 90295484Semaste if (cp[0] != HDLC_ADDR) { 91295484Semaste p->hdlc.lqm.ifInErrors++; 92295484Semaste p->hdlc.stats.badaddr++; 93295484Semaste log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]); 94295484Semaste m_freem(bp); 95295484Semaste return NULL; 96295484Semaste } 97295484Semaste if (cp[1] != HDLC_UI) { 98295484Semaste p->hdlc.lqm.ifInErrors++; 99295484Semaste p->hdlc.stats.badcommand++; 100295484Semaste log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]); 101295484Semaste m_freem(bp); 102295484Semaste return NULL; 103295484Semaste } 104295484Semaste m_settype(bp, MB_ACFIN); 105295484Semaste } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) { 106295484Semaste /* 107295484Semaste * We can receive compressed packets, but the peer still sends 108295484Semaste * uncompressed packets (or maybe this is a PROTO_LCP packet) ! 109295484Semaste */ 110295484Semaste bp = mbuf_Read(bp, cp, 2); 111295484Semaste m_settype(bp, MB_ACFIN); 112295484Semaste } 113295484Semaste } 114295484Semaste 115295484Semaste return bp; 116295484Semaste} 117295484Semaste 118295484Semastestruct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull }; 119295484Semaste