2 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/usr.sbin/ppp/acf.c,v 1.4.2.1 2000/08/19 09:29:59 brian Exp $
27 * $DragonFly: src/usr.sbin/ppp/acf.c,v 1.2 2003/06/17 04:30:00 dillon Exp $
30 #include <sys/types.h>
43 #include "throughput.h"
49 #include "descriptor.h"
54 acf_WrapperOctets(struct lcp *lcp, u_short proto)
56 return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0;
60 acf_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp,
61 int pri, u_short *proto)
63 const u_char cp[2] = { HDLC_ADDR, HDLC_UI };
65 if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0) {
66 bp = m_prepend(bp, cp, 2, 0);
67 m_settype(bp, MB_ACFOUT);
74 acf_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp, u_short *proto)
76 struct physical *p = link2physical(l);
80 log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n");
84 if (mbuf_View(bp, cp, 2) == 2) {
85 if (!p->link.lcp.want_acfcomp) {
86 /* We expect the packet not to be compressed */
87 bp = mbuf_Read(bp, cp, 2);
88 if (cp[0] != HDLC_ADDR) {
89 p->hdlc.lqm.SaveInErrors++;
90 p->hdlc.stats.badaddr++;
91 log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]);
95 if (cp[1] != HDLC_UI) {
96 p->hdlc.lqm.SaveInErrors++;
97 p->hdlc.stats.badcommand++;
98 log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]);
102 m_settype(bp, MB_ACFIN);
103 } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) {
105 * We can receive compressed packets, but the peer still sends
106 * uncompressed packets (or maybe this is a PROTO_LCP packet) !
108 bp = mbuf_Read(bp, cp, 2);
109 m_settype(bp, MB_ACFIN);
116 struct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull };