1 /*-
2 * Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 *
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 1.3 2008/05/19 10:19:49 corecode Exp $
28 */
29
30 #include <sys/types.h>
31 #include <sys/select.h>
32
33 #include <stdio.h>
34 #include <termios.h>
35
36 #include "defs.h"
37 #include "layer.h"
38 #include "timer.h"
39 #include "fsm.h"
40 #include "log.h"
41 #include "mbuf.h"
42 #include "acf.h"
43 #include "proto.h"
44 #include "throughput.h"
45 #include "lqr.h"
46 #include "hdlc.h"
47 #include "lcp.h"
48 #include "ccp.h"
49 #include "link.h"
50 #include "descriptor.h"
51 #include "async.h"
52 #include "physical.h"
53
54 int
acf_WrapperOctets(struct lcp * lcp,u_short proto)55 acf_WrapperOctets(struct lcp *lcp, u_short proto)
56 {
57 return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0;
58 }
59
60 static struct mbuf *
acf_LayerPush(struct bundle * b __unused,struct link * l,struct mbuf * bp,int pri __unused,u_short * proto)61 acf_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp,
62 int pri __unused, u_short *proto)
63 {
64 const u_char cp[2] = { HDLC_ADDR, HDLC_UI };
65
66 if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0) {
67 bp = m_prepend(bp, cp, 2, 0);
68 m_settype(bp, MB_ACFOUT);
69 }
70
71 return bp;
72 }
73
74 static struct mbuf *
acf_LayerPull(struct bundle * b __unused,struct link * l,struct mbuf * bp,u_short * proto __unused)75 acf_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp,
76 u_short *proto __unused)
77 {
78 struct physical *p = link2physical(l);
79 u_char cp[2];
80
81 if (!p) {
82 log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n");
83 return bp;
84 }
85
86 if (mbuf_View(bp, cp, 2) == 2) {
87 if (!p->link.lcp.want_acfcomp) {
88 /* We expect the packet not to be compressed */
89 bp = mbuf_Read(bp, cp, 2);
90 if (cp[0] != HDLC_ADDR) {
91 p->hdlc.lqm.SaveInErrors++;
92 p->hdlc.stats.badaddr++;
93 log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]);
94 m_freem(bp);
95 return NULL;
96 }
97 if (cp[1] != HDLC_UI) {
98 p->hdlc.lqm.SaveInErrors++;
99 p->hdlc.stats.badcommand++;
100 log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]);
101 m_freem(bp);
102 return NULL;
103 }
104 m_settype(bp, MB_ACFIN);
105 } else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) {
106 /*
107 * We can receive compressed packets, but the peer still sends
108 * uncompressed packets (or maybe this is a PROTO_LCP packet) !
109 */
110 bp = mbuf_Read(bp, cp, 2);
111 m_settype(bp, MB_ACFIN);
112 }
113 }
114
115 return bp;
116 }
117
118 struct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull };
119