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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
/*
* Copyright (c) 1998-2006 The TCPDUMP project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* support for the IEEE MPCP protocol as per 802.3ah
*
* Original code by Hannes Gredler (hannes@juniper.net)
*/
#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include "interface.h"
#include "extract.h"
#define MPCP_TIMESTAMP_LEN 4
#define MPCP_TIMESTAMP_DURATION_LEN 2
struct mpcp_common_header_t {
uint8_t opcode[2];
uint8_t timestamp[MPCP_TIMESTAMP_LEN];
};
#define MPCP_OPCODE_PAUSE 0x0001
#define MPCP_OPCODE_GATE 0x0002
#define MPCP_OPCODE_REPORT 0x0003
#define MPCP_OPCODE_REG_REQ 0x0004
#define MPCP_OPCODE_REG 0x0005
#define MPCP_OPCODE_REG_ACK 0x0006
static const struct tok mpcp_opcode_values[] = {
{ MPCP_OPCODE_PAUSE, "Pause" },
{ MPCP_OPCODE_GATE, "Gate" },
{ MPCP_OPCODE_REPORT, "Report" },
{ MPCP_OPCODE_REG_REQ, "Register Request" },
{ MPCP_OPCODE_REG, "Register" },
{ MPCP_OPCODE_REG_ACK, "Register ACK" },
{ 0, NULL}
};
#define MPCP_GRANT_NUMBER_LEN 1
#define MPCP_GRANT_NUMBER_MASK 0x7
static const struct tok mpcp_grant_flag_values[] = {
{ 0x08, "Discovery" },
{ 0x10, "Force Grant #1" },
{ 0x20, "Force Grant #2" },
{ 0x40, "Force Grant #3" },
{ 0x80, "Force Grant #4" },
{ 0, NULL}
};
struct mpcp_grant_t {
uint8_t starttime[MPCP_TIMESTAMP_LEN];
uint8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
};
struct mpcp_reg_req_t {
uint8_t flags;
uint8_t pending_grants;
};
static const struct tok mpcp_reg_req_flag_values[] = {
{ 1, "Register" },
{ 3, "De-Register" },
{ 0, NULL}
};
struct mpcp_reg_t {
uint8_t assigned_port[2];
uint8_t flags;
uint8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
uint8_t echoed_pending_grants;
};
static const struct tok mpcp_reg_flag_values[] = {
{ 1, "Re-Register" },
{ 2, "De-Register" },
{ 3, "ACK" },
{ 4, "NACK" },
{ 0, NULL}
};
#define MPCP_REPORT_QUEUESETS_LEN 1
#define MPCP_REPORT_REPORTBITMAP_LEN 1
static const struct tok mpcp_report_bitmap_values[] = {
{ 0x01, "Q0" },
{ 0x02, "Q1" },
{ 0x04, "Q2" },
{ 0x08, "Q3" },
{ 0x10, "Q4" },
{ 0x20, "Q5" },
{ 0x40, "Q6" },
{ 0x80, "Q7" },
{ 0, NULL}
};
struct mpcp_reg_ack_t {
uint8_t flags;
uint8_t echoed_assigned_port[2];
uint8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
};
static const struct tok mpcp_reg_ack_flag_values[] = {
{ 0, "NACK" },
{ 1, "ACK" },
{ 0, NULL}
};
void
mpcp_print(netdissect_options *ndo, register const u_char *pptr, register u_int length)
{
union {
const struct mpcp_common_header_t *common_header;
const struct mpcp_grant_t *grant;
const struct mpcp_reg_req_t *reg_req;
const struct mpcp_reg_t *reg;
const struct mpcp_reg_ack_t *reg_ack;
} mpcp;
const u_char *tptr;
uint16_t opcode;
uint8_t grant_numbers, grant;
uint8_t queue_sets, queue_set, report_bitmap, report;
tptr=pptr;
mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
ND_TCHECK2(*tptr, sizeof(const struct mpcp_common_header_t));
opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
ND_PRINT((ndo, "MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode)));
if (opcode != MPCP_OPCODE_PAUSE) {
ND_PRINT((ndo, ", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp)));
}
ND_PRINT((ndo, ", length %u", length));
if (!ndo->ndo_vflag)
return;
tptr += sizeof(const struct mpcp_common_header_t);
switch (opcode) {
case MPCP_OPCODE_PAUSE:
break;
case MPCP_OPCODE_GATE:
ND_TCHECK2(*tptr, MPCP_GRANT_NUMBER_LEN);
grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
ND_PRINT((ndo, "\n\tGrant Numbers %u, Flags [ %s ]",
grant_numbers,
bittok2str(mpcp_grant_flag_values,
"?",
*tptr &~ MPCP_GRANT_NUMBER_MASK)));
tptr++;
for (grant = 1; grant <= grant_numbers; grant++) {
ND_TCHECK2(*tptr, sizeof(const struct mpcp_grant_t));
mpcp.grant = (const struct mpcp_grant_t *)tptr;
ND_PRINT((ndo, "\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
grant,
EXTRACT_32BITS(mpcp.grant->starttime),
EXTRACT_16BITS(mpcp.grant->duration)));
tptr += sizeof(const struct mpcp_grant_t);
}
ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
ND_PRINT((ndo, "\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr)));
break;
case MPCP_OPCODE_REPORT:
ND_TCHECK2(*tptr, MPCP_REPORT_QUEUESETS_LEN);
queue_sets = *tptr;
tptr+=MPCP_REPORT_QUEUESETS_LEN;
ND_PRINT((ndo, "\n\tTotal Queue-Sets %u", queue_sets));
for (queue_set = 1; queue_set < queue_sets; queue_set++) {
ND_TCHECK2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN);
report_bitmap = *(tptr);
ND_PRINT((ndo, "\n\t Queue-Set #%u, Report-Bitmap [ %s ]",
queue_sets,
bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap)));
tptr++;
report=1;
while (report_bitmap != 0) {
if (report_bitmap & 1) {
ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
ND_PRINT((ndo, "\n\t Q%u Report, Duration %u ticks",
report,
EXTRACT_16BITS(tptr)));
tptr+=MPCP_TIMESTAMP_DURATION_LEN;
}
report++;
report_bitmap = report_bitmap >> 1;
}
}
break;
case MPCP_OPCODE_REG_REQ:
ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_req_t));
mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
ND_PRINT((ndo, "\n\tFlags [ %s ], Pending-Grants %u",
bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
mpcp.reg_req->pending_grants));
break;
case MPCP_OPCODE_REG:
ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_t));
mpcp.reg = (const struct mpcp_reg_t *)tptr;
ND_PRINT((ndo, "\n\tAssigned-Port %u, Flags [ %s ]" \
"\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
EXTRACT_16BITS(mpcp.reg->assigned_port),
bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
EXTRACT_16BITS(mpcp.reg->sync_time),
mpcp.reg->echoed_pending_grants));
break;
case MPCP_OPCODE_REG_ACK:
ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_ack_t));
mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
ND_PRINT((ndo, "\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
"\n\tEchoed-Sync-Time %u ticks",
EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time)));
break;
default:
/* unknown opcode - hexdump for now */
print_unknown_data(ndo,pptr, "\n\t", length);
break;
}
return;
trunc:
ND_PRINT((ndo, "\n\t[|MPCP]"));
}
/*
* Local Variables:
* c-style: whitesmith
* c-basic-offset: 8
* End:
*/
|
