1de7b4b805
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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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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* $FreeBSD$
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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 "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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#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 __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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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 = m_prepend(bp, cp, 2, 0);
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m_settype(bp, MB_ACFOUT);
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}
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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 __unused, struct link *l, struct mbuf *bp,
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u_short *proto __unused)
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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.ifInErrors++;
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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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m_freem(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.ifInErrors++;
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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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m_freem(bp);
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return NULL;
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}
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m_settype(bp, MB_ACFIN);
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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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m_settype(bp, MB_ACFIN);
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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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