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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/*-
* Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
* based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
* Internet Initiative Japan, Inc (IIJ)
* 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/param.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <string.h> /* strlen/memcpy */
#include <termios.h>
#include "layer.h"
#include "mbuf.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "proto.h"
#include "slcompress.h"
#include "lqr.h"
#include "hdlc.h"
#include "defs.h"
#include "iplist.h"
#include "throughput.h"
#include "ncpaddr.h"
#include "ipcp.h"
#include "lcp.h"
#include "ccp.h"
#include "link.h"
#include "filter.h"
#include "descriptor.h"
#include "mp.h"
#ifndef NORADIUS
#include "radius.h"
#endif
#include "ipv6cp.h"
#include "ncp.h"
#include "bundle.h"
#include "vjcomp.h"
#define MAX_VJHEADER 16 /* Maximum size of compressed header */
static struct mbuf *
vj_LayerPush(struct bundle *bundle, struct link *l __unused, struct mbuf *bp,
int pri __unused, u_short *proto)
{
int type;
struct ip *pip;
u_short cproto = bundle->ncp.ipcp.peer_compproto >> 16;
bp = m_pullup(bp);
pip = (struct ip *)MBUF_CTOP(bp);
if (*proto == PROTO_IP && pip->ip_p == IPPROTO_TCP &&
cproto == PROTO_VJCOMP) {
type = sl_compress_tcp(bp, pip, &bundle->ncp.ipcp.vj.cslc,
&bundle->ncp.ipcp.vj.slstat,
bundle->ncp.ipcp.peer_compproto & 0xff);
log_Printf(LogDEBUG, "vj_LayerWrite: type = %x\n", type);
switch (type) {
case TYPE_IP:
break;
case TYPE_UNCOMPRESSED_TCP:
*proto = PROTO_VJUNCOMP;
log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n");
m_settype(bp, MB_VJOUT);
break;
case TYPE_COMPRESSED_TCP:
*proto = PROTO_VJCOMP;
log_Printf(LogDEBUG, "vj_LayerPush: PROTO_IP -> PROTO_VJUNCOMP\n");
m_settype(bp, MB_VJOUT);
break;
default:
log_Printf(LogERROR, "vj_LayerPush: Unknown frame type %x\n", type);
m_freem(bp);
return NULL;
}
}
return bp;
}
static struct mbuf *
VjUncompressTcp(struct ipcp *ipcp, struct mbuf *bp, u_char type)
{
u_char *bufp;
int len, olen, rlen;
u_char work[MAX_HDR + MAX_VJHEADER]; /* enough to hold TCP/IP header */
bp = m_pullup(bp);
olen = len = m_length(bp);
if (type == TYPE_UNCOMPRESSED_TCP) {
/*
* Uncompressed packet does NOT change its size, so that we can use mbuf
* space for uncompression job.
*/
bufp = MBUF_CTOP(bp);
len = sl_uncompress_tcp(&bufp, len, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
(ipcp->my_compproto >> 8) & 255);
if (len <= 0) {
m_freem(bp);
bp = NULL;
} else
m_settype(bp, MB_VJIN);
return bp;
}
/*
* Handle compressed packet. 1) Read up to MAX_VJHEADER bytes into work
* space. 2) Try to uncompress it. 3) Compute amount of necessary space. 4)
* Copy unread data info there.
*/
if (len > MAX_VJHEADER)
len = MAX_VJHEADER;
rlen = len;
bufp = work + MAX_HDR;
bp = mbuf_Read(bp, bufp, rlen);
len = sl_uncompress_tcp(&bufp, olen, type, &ipcp->vj.cslc, &ipcp->vj.slstat,
(ipcp->my_compproto >> 8) & 255);
if (len <= 0) {
m_freem(bp);
return NULL;
}
len -= olen;
len += rlen;
bp = m_prepend(bp, bufp, len, 0);
m_settype(bp, MB_VJIN);
return bp;
}
static struct mbuf *
vj_LayerPull(struct bundle *bundle, struct link *l __unused, struct mbuf *bp,
u_short *proto)
{
u_char type;
switch (*proto) {
case PROTO_VJCOMP:
type = TYPE_COMPRESSED_TCP;
log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJCOMP -> PROTO_IP\n");
break;
case PROTO_VJUNCOMP:
type = TYPE_UNCOMPRESSED_TCP;
log_Printf(LogDEBUG, "vj_LayerPull: PROTO_VJUNCOMP -> PROTO_IP\n");
break;
default:
return bp;
}
*proto = PROTO_IP;
return VjUncompressTcp(&bundle->ncp.ipcp, bp, type);
}
const char *
vj2asc(u_int32_t val)
{
static char asc[50]; /* The return value is used immediately */
if (val)
snprintf(asc, sizeof asc, "%d VJ slots with%s slot compression",
(int)((val>>8)&15)+1, val & 1 ? "" : "out");
else
strcpy(asc, "VJ disabled");
return asc;
}
struct layer vjlayer = { LAYER_VJ, "vj", vj_LayerPush, vj_LayerPull };
|
