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
|
/*
* This module implements printing of the very basic (version-independent)
* OpenFlow header and iteration over OpenFlow messages. It is intended for
* dispatching of version-specific OpenFlow message decoding.
*
*
* Copyright (c) 2013 The TCPDUMP project
* 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
#include "netdissect.h"
#include "extract.h"
#include "openflow.h"
#include "oui.h"
static const char tstr[] = " [|openflow]";
static const char istr[] = " (invalid)";
#define OF_VER_1_0 0x01
const struct tok onf_exp_str[] = {
{ ONF_EXP_ONF, "ONF Extensions" },
{ ONF_EXP_BUTE, "Budapest University of Technology and Economics" },
{ ONF_EXP_NOVIFLOW, "NoviFlow" },
{ ONF_EXP_L3, "L3+ Extensions, Vendor Neutral" },
{ ONF_EXP_L4L7, "L4-L7 Extensions" },
{ ONF_EXP_WMOB, "Wireless and Mobility Extensions" },
{ ONF_EXP_FABS, "Forwarding Abstractions Extensions" },
{ ONF_EXP_OTRANS, "Optical Transport Extensions" },
{ 0, NULL }
};
const char *
of_vendor_name(const uint32_t vendor)
{
const struct tok *table = (vendor & 0xff000000) == 0 ? oui_values : onf_exp_str;
return tok2str(table, "unknown", vendor);
}
static void
of_header_print(netdissect_options *ndo, const uint8_t version, const uint8_t type,
const uint16_t length, const uint32_t xid)
{
ND_PRINT((ndo, "\n\tversion unknown (0x%02x), type 0x%02x, length %u, xid 0x%08x",
version, type, length, xid));
}
/* Print a single OpenFlow message. */
static const u_char *
of_header_body_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
{
uint8_t version, type;
uint16_t length;
uint32_t xid;
if (ep < cp + OF_HEADER_LEN)
goto invalid;
/* version */
ND_TCHECK2(*cp, 1);
version = *cp;
cp += 1;
/* type */
ND_TCHECK2(*cp, 1);
type = *cp;
cp += 1;
/* length */
ND_TCHECK2(*cp, 2);
length = EXTRACT_16BITS(cp);
cp += 2;
/* xid */
ND_TCHECK2(*cp, 4);
xid = EXTRACT_32BITS(cp);
cp += 4;
/* Message length includes the header length and a message always includes
* the basic header. A message length underrun fails decoding of the rest of
* the current packet. At the same time, try decoding as much of the current
* message as possible even when it does not end within the current TCP
* segment. */
if (length < OF_HEADER_LEN) {
of_header_print(ndo, version, type, length, xid);
goto invalid;
}
/* Decode known protocol versions further without printing the header (the
* type decoding is version-specific. */
switch (version) {
case OF_VER_1_0:
return of10_header_body_print(ndo, cp, ep, type, length, xid);
default:
of_header_print(ndo, version, type, length, xid);
ND_TCHECK2(*cp, length - OF_HEADER_LEN);
return cp + length - OF_HEADER_LEN; /* done with current message */
}
invalid: /* fail current packet */
ND_PRINT((ndo, "%s", istr));
ND_TCHECK2(*cp, ep - cp);
return ep;
trunc:
ND_PRINT((ndo, "%s", tstr));
return ep;
}
/* Print a TCP segment worth of OpenFlow messages presuming the segment begins
* on a message boundary. */
void
openflow_print(netdissect_options *ndo, const u_char *cp, const u_int len)
{
const u_char *ep = cp + len;
ND_PRINT((ndo, ": OpenFlow"));
while (cp < ep)
cp = of_header_body_print(ndo, cp, ep);
}
|
