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
|
/*-
* 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 "layer.h"
#include "acf.h"
#include "defs.h"
#include "log.h"
#include "timer.h"
#include "fsm.h"
#include "mbuf.h"
#include "proto.h"
#include "lcp.h"
#include "throughput.h"
#include "lqr.h"
#include "hdlc.h"
#include "ccp.h"
#include "link.h"
int
proto_WrapperOctets(struct lcp *lcp, u_short proto)
{
return (lcp->his_protocomp && !(proto & 0xff00)) ? 1 : 2;
}
struct mbuf *
proto_Prepend(struct mbuf *bp, u_short proto, unsigned comp, int extra)
{
u_char cp[2];
cp[0] = proto >> 8;
cp[1] = proto & 0xff;
if (comp && cp[0] == 0)
bp = m_prepend(bp, cp + 1, 1, extra);
else
bp = m_prepend(bp, cp, 2, extra);
return bp;
}
static struct mbuf *
proto_LayerPush(struct bundle *b, struct link *l, struct mbuf *bp,
int pri, u_short *proto)
{
log_Printf(LogDEBUG, "proto_LayerPush: Using 0x%04x\n", *proto);
bp = proto_Prepend(bp, *proto, l->lcp.his_protocomp,
acf_WrapperOctets(&l->lcp, *proto));
m_settype(bp, MB_PROTOOUT);
link_ProtocolRecord(l, *proto, PROTO_OUT);
return bp;
}
static struct mbuf *
proto_LayerPull(struct bundle *b, struct link *l, struct mbuf *bp,
u_short *proto)
{
u_char cp[2];
size_t got;
if ((got = mbuf_View(bp, cp, 2)) == 0) {
m_freem(bp);
return NULL;
}
*proto = cp[0];
if (!(*proto & 1)) {
if (got == 1) {
m_freem(bp);
return NULL;
}
bp = mbuf_Read(bp, cp, 2);
*proto = (*proto << 8) | cp[1];
} else
bp = mbuf_Read(bp, cp, 1);
log_Printf(LogDEBUG, "proto_LayerPull: unknown -> 0x%04x\n", *proto);
m_settype(bp, MB_PROTOIN);
link_ProtocolRecord(l, *proto, PROTO_IN);
return bp;
}
struct layer protolayer =
{ LAYER_PROTO, "proto", proto_LayerPush, proto_LayerPull };
|
