1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
|
/*-
* Copyright (c) 1999 Brian Somers <brian@Awfulhak.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <stdio.h>
#include <termios.h>
#include "defs.h"
#include "layer.h"
#include "timer.h"
#include "fsm.h"
#include "log.h"
#include "mbuf.h"
#include "acf.h"
#include "proto.h"
#include "throughput.h"
#include "lqr.h"
#include "hdlc.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "descriptor.h"
#include "async.h"
#include "physical.h"
int
acf_WrapperOctets(struct lcp *lcp, u_short proto)
{
return (proto == PROTO_LCP || lcp->his_acfcomp == 0) ? 2 : 0;
}
static struct mbuf *
acf_LayerPush(struct bundle *b __unused, struct link *l, struct mbuf *bp,
int pri __unused, u_short *proto)
{
const u_char cp[2] = { HDLC_ADDR, HDLC_UI };
if (*proto == PROTO_LCP || l->lcp.his_acfcomp == 0) {
bp = m_prepend(bp, cp, 2, 0);
m_settype(bp, MB_ACFOUT);
}
return bp;
}
static struct mbuf *
acf_LayerPull(struct bundle *b __unused, struct link *l, struct mbuf *bp,
u_short *proto __unused)
{
struct physical *p = link2physical(l);
u_char cp[2];
if (!p) {
log_Printf(LogERROR, "Can't Pull an acf packet from a logical link\n");
return bp;
}
if (mbuf_View(bp, cp, 2) == 2) {
if (!p->link.lcp.want_acfcomp) {
/* We expect the packet not to be compressed */
bp = mbuf_Read(bp, cp, 2);
if (cp[0] != HDLC_ADDR) {
p->hdlc.lqm.ifInErrors++;
p->hdlc.stats.badaddr++;
log_Printf(LogDEBUG, "acf_LayerPull: addr 0x%02x\n", cp[0]);
m_freem(bp);
return NULL;
}
if (cp[1] != HDLC_UI) {
p->hdlc.lqm.ifInErrors++;
p->hdlc.stats.badcommand++;
log_Printf(LogDEBUG, "acf_LayerPull: control 0x%02x\n", cp[1]);
m_freem(bp);
return NULL;
}
m_settype(bp, MB_ACFIN);
} else if (cp[0] == HDLC_ADDR && cp[1] == HDLC_UI) {
/*
* We can receive compressed packets, but the peer still sends
* uncompressed packets (or maybe this is a PROTO_LCP packet) !
*/
bp = mbuf_Read(bp, cp, 2);
m_settype(bp, MB_ACFIN);
}
}
return bp;
}
struct layer acflayer = { LAYER_ACF, "acf", acf_LayerPush, acf_LayerPull };
|
