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 #ifndef lint
21 static const char rcsid[] _U_ =
22 "@(#) $Header: /tcpdump/master/tcpdump/print-mpcp.c,v 1.2 2006-02-10 17:24:55 hannes Exp $";
23 #endif
24
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28
29 #include <tcpdump-stdinc.h>
30
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34
35 #include "interface.h"
36 #include "extract.h"
37 #include "addrtoname.h"
38 #include "ether.h"
39
40 #define MPCP_TIMESTAMP_LEN 4
41 #define MPCP_TIMESTAMP_DURATION_LEN 2
42
43 struct mpcp_common_header_t {
44 u_int8_t opcode[2];
45 u_int8_t timestamp[MPCP_TIMESTAMP_LEN];
46 };
47
48 #define MPCP_OPCODE_PAUSE 0x0001
49 #define MPCP_OPCODE_GATE 0x0002
50 #define MPCP_OPCODE_REPORT 0x0003
51 #define MPCP_OPCODE_REG_REQ 0x0004
52 #define MPCP_OPCODE_REG 0x0005
53 #define MPCP_OPCODE_REG_ACK 0x0006
54
55 static const struct tok mpcp_opcode_values[] = {
56 { MPCP_OPCODE_PAUSE, "Pause" },
57 { MPCP_OPCODE_GATE, "Gate" },
58 { MPCP_OPCODE_REPORT, "Report" },
59 { MPCP_OPCODE_REG_REQ, "Register Request" },
60 { MPCP_OPCODE_REG, "Register" },
61 { MPCP_OPCODE_REG_ACK, "Register ACK" },
62 { 0, NULL}
63 };
64
65 #define MPCP_GRANT_NUMBER_LEN 1
66 #define MPCP_GRANT_NUMBER_MASK 0x7
67 static const struct tok mpcp_grant_flag_values[] = {
68 { 0x08, "Discovery" },
69 { 0x10, "Force Grant #1" },
70 { 0x20, "Force Grant #2" },
71 { 0x40, "Force Grant #3" },
72 { 0x80, "Force Grant #4" },
73 { 0, NULL}
74 };
75
76 struct mpcp_grant_t {
77 u_int8_t starttime[MPCP_TIMESTAMP_LEN];
78 u_int8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
79 };
80
81 struct mpcp_reg_req_t {
82 u_int8_t flags;
83 u_int8_t pending_grants;
84 };
85
86
87 static const struct tok mpcp_reg_req_flag_values[] = {
88 { 1, "Register" },
89 { 3, "De-Register" },
90 { 0, NULL}
91 };
92
93 struct mpcp_reg_t {
94 u_int8_t assigned_port[2];
95 u_int8_t flags;
96 u_int8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
97 u_int8_t echoed_pending_grants;
98 };
99
100 static const struct tok mpcp_reg_flag_values[] = {
101 { 1, "Re-Register" },
102 { 2, "De-Register" },
103 { 3, "ACK" },
104 { 4, "NACK" },
105 { 0, NULL}
106 };
107
108 #define MPCP_REPORT_QUEUESETS_LEN 1
109 #define MPCP_REPORT_REPORTBITMAP_LEN 1
110 static const struct tok mpcp_report_bitmap_values[] = {
111 { 0x01, "Q0" },
112 { 0x02, "Q1" },
113 { 0x04, "Q2" },
114 { 0x08, "Q3" },
115 { 0x10, "Q4" },
116 { 0x20, "Q5" },
117 { 0x40, "Q6" },
118 { 0x80, "Q7" },
119 { 0, NULL}
120 };
121
122 struct mpcp_reg_ack_t {
123 u_int8_t flags;
124 u_int8_t echoed_assigned_port[2];
125 u_int8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
126 };
127
128 static const struct tok mpcp_reg_ack_flag_values[] = {
129 { 0, "NACK" },
130 { 1, "ACK" },
131 { 0, NULL}
132 };
133
134 void
mpcp_print(register const u_char * pptr,register u_int length)135 mpcp_print(register const u_char *pptr, register u_int length) {
136
137 union {
138 const struct mpcp_common_header_t *common_header;
139 const struct mpcp_grant_t *grant;
140 const struct mpcp_reg_req_t *reg_req;
141 const struct mpcp_reg_t *reg;
142 const struct mpcp_reg_ack_t *reg_ack;
143 } mpcp;
144
145
146 const u_char *tptr;
147 u_int16_t opcode;
148 u_int8_t grant_numbers, grant;
149 u_int8_t queue_sets, queue_set, report_bitmap, report;
150
151 tptr=pptr;
152 mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
153
154 if (!TTEST2(*tptr, sizeof(const struct mpcp_common_header_t)))
155 goto trunc;
156 opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
157 printf("MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode));
158 if (opcode != MPCP_OPCODE_PAUSE) {
159 printf(", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp));
160 }
161 printf(", length %u", length);
162
163 if (!vflag)
164 return;
165
166 tptr += sizeof(const struct mpcp_common_header_t);
167
168 switch (opcode) {
169 case MPCP_OPCODE_PAUSE:
170 break;
171
172 case MPCP_OPCODE_GATE:
173 if (!TTEST2(*tptr, MPCP_GRANT_NUMBER_LEN))
174 goto trunc;
175 grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
176 printf("\n\tGrant Numbers %u, Flags [ %s ]",
177 grant_numbers,
178 bittok2str(mpcp_grant_flag_values,
179 "?",
180 *tptr &~ MPCP_GRANT_NUMBER_MASK));
181 tptr++;
182
183 for (grant = 1; grant <= grant_numbers; grant++) {
184 if (!TTEST2(*tptr, sizeof(const struct mpcp_grant_t)))
185 goto trunc;
186 mpcp.grant = (const struct mpcp_grant_t *)tptr;
187 printf("\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
188 grant,
189 EXTRACT_32BITS(mpcp.grant->starttime),
190 EXTRACT_16BITS(mpcp.grant->duration));
191 tptr += sizeof(const struct mpcp_grant_t);
192 }
193
194 if (!TTEST2(*tptr, MPCP_TIMESTAMP_DURATION_LEN))
195 goto trunc;
196 printf("\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr));
197 break;
198
199
200 case MPCP_OPCODE_REPORT:
201 if (!TTEST2(*tptr, MPCP_REPORT_QUEUESETS_LEN))
202 goto trunc;
203 queue_sets = *tptr;
204 tptr+=MPCP_REPORT_QUEUESETS_LEN;
205 printf("\n\tTotal Queue-Sets %u", queue_sets);
206
207 for (queue_set = 1; queue_set < queue_sets; queue_set++) {
208 if (!TTEST2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN))
209 goto trunc;
210 report_bitmap = *(tptr);
211 printf("\n\t Queue-Set #%u, Report-Bitmap [ %s ]",
212 queue_sets,
213 bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap));
214 tptr++;
215
216 report=1;
217 while (report_bitmap != 0) {
218 if (report_bitmap & 1) {
219 if (!TTEST2(*tptr, MPCP_TIMESTAMP_DURATION_LEN))
220 goto trunc;
221 printf("\n\t Q%u Report, Duration %u ticks",
222 report,
223 EXTRACT_16BITS(tptr));
224 tptr+=MPCP_TIMESTAMP_DURATION_LEN;
225 }
226 report++;
227 report_bitmap = report_bitmap >> 1;
228 }
229 }
230 break;
231
232 case MPCP_OPCODE_REG_REQ:
233 if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_req_t)))
234 goto trunc;
235 mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
236 printf("\n\tFlags [ %s ], Pending-Grants %u",
237 bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
238 mpcp.reg_req->pending_grants);
239 break;
240
241 case MPCP_OPCODE_REG:
242 if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_t)))
243 goto trunc;
244 mpcp.reg = (const struct mpcp_reg_t *)tptr;
245 printf("\n\tAssigned-Port %u, Flags [ %s ]" \
246 "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
247 EXTRACT_16BITS(mpcp.reg->assigned_port),
248 bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
249 EXTRACT_16BITS(mpcp.reg->sync_time),
250 mpcp.reg->echoed_pending_grants);
251 break;
252
253 case MPCP_OPCODE_REG_ACK:
254 if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_ack_t)))
255 goto trunc;
256 mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
257 printf("\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
258 "\n\tEchoed-Sync-Time %u ticks",
259 EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
260 bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
261 EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time));
262 break;
263
264 default:
265 /* unknown opcode - hexdump for now */
266 print_unknown_data(pptr, "\n\t", length);
267 break;
268 }
269
270 return;
271
272 trunc:
273 printf("\n\t[|MPCP]");
274 }
275