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1 office 1 /*
2 * Copyright (c) 1998-2006 The TCPDUMP project
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that: (1) source code
6 * distributions retain the above copyright notice and this paragraph
7 * in its entirety, and (2) distributions including binary code include
8 * the above copyright notice and this paragraph in its entirety in
9 * the documentation or other materials provided with the distribution.
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
11 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
12 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
13 * FOR A PARTICULAR PURPOSE.
14 *
15 * support for the IEEE MPCP protocol as per 802.3ah
16 *
17 * Original code by Hannes Gredler (hannes@juniper.net)
18 */
19  
20 #define NETDISSECT_REWORKED
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24  
25 #include <tcpdump-stdinc.h>
26  
27 #include "interface.h"
28 #include "extract.h"
29  
30 #define MPCP_TIMESTAMP_LEN 4
31 #define MPCP_TIMESTAMP_DURATION_LEN 2
32  
33 struct mpcp_common_header_t {
34 uint8_t opcode[2];
35 uint8_t timestamp[MPCP_TIMESTAMP_LEN];
36 };
37  
38 #define MPCP_OPCODE_PAUSE 0x0001
39 #define MPCP_OPCODE_GATE 0x0002
40 #define MPCP_OPCODE_REPORT 0x0003
41 #define MPCP_OPCODE_REG_REQ 0x0004
42 #define MPCP_OPCODE_REG 0x0005
43 #define MPCP_OPCODE_REG_ACK 0x0006
44  
45 static const struct tok mpcp_opcode_values[] = {
46 { MPCP_OPCODE_PAUSE, "Pause" },
47 { MPCP_OPCODE_GATE, "Gate" },
48 { MPCP_OPCODE_REPORT, "Report" },
49 { MPCP_OPCODE_REG_REQ, "Register Request" },
50 { MPCP_OPCODE_REG, "Register" },
51 { MPCP_OPCODE_REG_ACK, "Register ACK" },
52 { 0, NULL}
53 };
54  
55 #define MPCP_GRANT_NUMBER_LEN 1
56 #define MPCP_GRANT_NUMBER_MASK 0x7
57 static const struct tok mpcp_grant_flag_values[] = {
58 { 0x08, "Discovery" },
59 { 0x10, "Force Grant #1" },
60 { 0x20, "Force Grant #2" },
61 { 0x40, "Force Grant #3" },
62 { 0x80, "Force Grant #4" },
63 { 0, NULL}
64 };
65  
66 struct mpcp_grant_t {
67 uint8_t starttime[MPCP_TIMESTAMP_LEN];
68 uint8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
69 };
70  
71 struct mpcp_reg_req_t {
72 uint8_t flags;
73 uint8_t pending_grants;
74 };
75  
76  
77 static const struct tok mpcp_reg_req_flag_values[] = {
78 { 1, "Register" },
79 { 3, "De-Register" },
80 { 0, NULL}
81 };
82  
83 struct mpcp_reg_t {
84 uint8_t assigned_port[2];
85 uint8_t flags;
86 uint8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
87 uint8_t echoed_pending_grants;
88 };
89  
90 static const struct tok mpcp_reg_flag_values[] = {
91 { 1, "Re-Register" },
92 { 2, "De-Register" },
93 { 3, "ACK" },
94 { 4, "NACK" },
95 { 0, NULL}
96 };
97  
98 #define MPCP_REPORT_QUEUESETS_LEN 1
99 #define MPCP_REPORT_REPORTBITMAP_LEN 1
100 static const struct tok mpcp_report_bitmap_values[] = {
101 { 0x01, "Q0" },
102 { 0x02, "Q1" },
103 { 0x04, "Q2" },
104 { 0x08, "Q3" },
105 { 0x10, "Q4" },
106 { 0x20, "Q5" },
107 { 0x40, "Q6" },
108 { 0x80, "Q7" },
109 { 0, NULL}
110 };
111  
112 struct mpcp_reg_ack_t {
113 uint8_t flags;
114 uint8_t echoed_assigned_port[2];
115 uint8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
116 };
117  
118 static const struct tok mpcp_reg_ack_flag_values[] = {
119 { 0, "NACK" },
120 { 1, "ACK" },
121 { 0, NULL}
122 };
123  
124 void
125 mpcp_print(netdissect_options *ndo, register const u_char *pptr, register u_int length)
126 {
127 union {
128 const struct mpcp_common_header_t *common_header;
129 const struct mpcp_grant_t *grant;
130 const struct mpcp_reg_req_t *reg_req;
131 const struct mpcp_reg_t *reg;
132 const struct mpcp_reg_ack_t *reg_ack;
133 } mpcp;
134  
135  
136 const u_char *tptr;
137 uint16_t opcode;
138 uint8_t grant_numbers, grant;
139 uint8_t queue_sets, queue_set, report_bitmap, report;
140  
141 tptr=pptr;
142 mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
143  
144 ND_TCHECK2(*tptr, sizeof(const struct mpcp_common_header_t));
145 opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
146 ND_PRINT((ndo, "MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode)));
147 if (opcode != MPCP_OPCODE_PAUSE) {
148 ND_PRINT((ndo, ", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp)));
149 }
150 ND_PRINT((ndo, ", length %u", length));
151  
152 if (!ndo->ndo_vflag)
153 return;
154  
155 tptr += sizeof(const struct mpcp_common_header_t);
156  
157 switch (opcode) {
158 case MPCP_OPCODE_PAUSE:
159 break;
160  
161 case MPCP_OPCODE_GATE:
162 ND_TCHECK2(*tptr, MPCP_GRANT_NUMBER_LEN);
163 grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
164 ND_PRINT((ndo, "\n\tGrant Numbers %u, Flags [ %s ]",
165 grant_numbers,
166 bittok2str(mpcp_grant_flag_values,
167 "?",
168 *tptr &~ MPCP_GRANT_NUMBER_MASK)));
169 tptr++;
170  
171 for (grant = 1; grant <= grant_numbers; grant++) {
172 ND_TCHECK2(*tptr, sizeof(const struct mpcp_grant_t));
173 mpcp.grant = (const struct mpcp_grant_t *)tptr;
174 ND_PRINT((ndo, "\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
175 grant,
176 EXTRACT_32BITS(mpcp.grant->starttime),
177 EXTRACT_16BITS(mpcp.grant->duration)));
178 tptr += sizeof(const struct mpcp_grant_t);
179 }
180  
181 ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
182 ND_PRINT((ndo, "\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr)));
183 break;
184  
185  
186 case MPCP_OPCODE_REPORT:
187 ND_TCHECK2(*tptr, MPCP_REPORT_QUEUESETS_LEN);
188 queue_sets = *tptr;
189 tptr+=MPCP_REPORT_QUEUESETS_LEN;
190 ND_PRINT((ndo, "\n\tTotal Queue-Sets %u", queue_sets));
191  
192 for (queue_set = 1; queue_set < queue_sets; queue_set++) {
193 ND_TCHECK2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN);
194 report_bitmap = *(tptr);
195 ND_PRINT((ndo, "\n\t Queue-Set #%u, Report-Bitmap [ %s ]",
196 queue_sets,
197 bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap)));
198 tptr++;
199  
200 report=1;
201 while (report_bitmap != 0) {
202 if (report_bitmap & 1) {
203 ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
204 ND_PRINT((ndo, "\n\t Q%u Report, Duration %u ticks",
205 report,
206 EXTRACT_16BITS(tptr)));
207 tptr+=MPCP_TIMESTAMP_DURATION_LEN;
208 }
209 report++;
210 report_bitmap = report_bitmap >> 1;
211 }
212 }
213 break;
214  
215 case MPCP_OPCODE_REG_REQ:
216 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_req_t));
217 mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
218 ND_PRINT((ndo, "\n\tFlags [ %s ], Pending-Grants %u",
219 bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
220 mpcp.reg_req->pending_grants));
221 break;
222  
223 case MPCP_OPCODE_REG:
224 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_t));
225 mpcp.reg = (const struct mpcp_reg_t *)tptr;
226 ND_PRINT((ndo, "\n\tAssigned-Port %u, Flags [ %s ]" \
227 "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
228 EXTRACT_16BITS(mpcp.reg->assigned_port),
229 bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
230 EXTRACT_16BITS(mpcp.reg->sync_time),
231 mpcp.reg->echoed_pending_grants));
232 break;
233  
234 case MPCP_OPCODE_REG_ACK:
235 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_ack_t));
236 mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
237 ND_PRINT((ndo, "\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
238 "\n\tEchoed-Sync-Time %u ticks",
239 EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
240 bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
241 EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time)));
242 break;
243  
244 default:
245 /* unknown opcode - hexdump for now */
246 print_unknown_data(ndo,pptr, "\n\t", length);
247 break;
248 }
249  
250 return;
251  
252 trunc:
253 ND_PRINT((ndo, "\n\t[|MPCP]"));
254 }
255 /*
256 * Local Variables:
257 * c-style: whitesmith
258 * c-basic-offset: 8
259 * End:
260 */