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 * Original code by Hannes Gredler (hannes@gredler.at)
16 */
17
18 /* \summary: IEEE 802.3ah Multi-Point Control Protocol (MPCP) printer */
19
20 #ifdef HAVE_CONFIG_H
21 #include "config.h"
22 #endif
23
24 #include <netdissect-stdinc.h>
25
26 #include "netdissect.h"
27 #include "extract.h"
28
29 #define MPCP_TIMESTAMP_LEN 4
30 #define MPCP_TIMESTAMP_DURATION_LEN 2
31
32 struct mpcp_common_header_t {
33 uint8_t opcode[2];
34 uint8_t timestamp[MPCP_TIMESTAMP_LEN];
35 };
36
37 #define MPCP_OPCODE_PAUSE 0x0001
38 #define MPCP_OPCODE_GATE 0x0002
39 #define MPCP_OPCODE_REPORT 0x0003
40 #define MPCP_OPCODE_REG_REQ 0x0004
41 #define MPCP_OPCODE_REG 0x0005
42 #define MPCP_OPCODE_REG_ACK 0x0006
43
44 static const struct tok mpcp_opcode_values[] = {
45 { MPCP_OPCODE_PAUSE, "Pause" },
46 { MPCP_OPCODE_GATE, "Gate" },
47 { MPCP_OPCODE_REPORT, "Report" },
48 { MPCP_OPCODE_REG_REQ, "Register Request" },
49 { MPCP_OPCODE_REG, "Register" },
50 { MPCP_OPCODE_REG_ACK, "Register ACK" },
51 { 0, NULL}
52 };
53
54 #define MPCP_GRANT_NUMBER_LEN 1
55 #define MPCP_GRANT_NUMBER_MASK 0x7
56 static const struct tok mpcp_grant_flag_values[] = {
57 { 0x08, "Discovery" },
58 { 0x10, "Force Grant #1" },
59 { 0x20, "Force Grant #2" },
60 { 0x40, "Force Grant #3" },
61 { 0x80, "Force Grant #4" },
62 { 0, NULL}
63 };
64
65 struct mpcp_grant_t {
66 uint8_t starttime[MPCP_TIMESTAMP_LEN];
67 uint8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
68 };
69
70 struct mpcp_reg_req_t {
71 uint8_t flags;
72 uint8_t pending_grants;
73 };
74
75
76 static const struct tok mpcp_reg_req_flag_values[] = {
77 { 1, "Register" },
78 { 3, "De-Register" },
79 { 0, NULL}
80 };
81
82 struct mpcp_reg_t {
83 uint8_t assigned_port[2];
84 uint8_t flags;
85 uint8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
86 uint8_t echoed_pending_grants;
87 };
88
89 static const struct tok mpcp_reg_flag_values[] = {
90 { 1, "Re-Register" },
91 { 2, "De-Register" },
92 { 3, "ACK" },
93 { 4, "NACK" },
94 { 0, NULL}
95 };
96
97 #define MPCP_REPORT_QUEUESETS_LEN 1
98 #define MPCP_REPORT_REPORTBITMAP_LEN 1
99 static const struct tok mpcp_report_bitmap_values[] = {
100 { 0x01, "Q0" },
101 { 0x02, "Q1" },
102 { 0x04, "Q2" },
103 { 0x08, "Q3" },
104 { 0x10, "Q4" },
105 { 0x20, "Q5" },
106 { 0x40, "Q6" },
107 { 0x80, "Q7" },
108 { 0, NULL}
109 };
110
111 struct mpcp_reg_ack_t {
112 uint8_t flags;
113 uint8_t echoed_assigned_port[2];
114 uint8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
115 };
116
117 static const struct tok mpcp_reg_ack_flag_values[] = {
118 { 0, "NACK" },
119 { 1, "ACK" },
120 { 0, NULL}
121 };
122
123 void
mpcp_print(netdissect_options * ndo,register const u_char * pptr,register u_int length)124 mpcp_print(netdissect_options *ndo, register const u_char *pptr, register u_int length)
125 {
126 union {
127 const struct mpcp_common_header_t *common_header;
128 const struct mpcp_grant_t *grant;
129 const struct mpcp_reg_req_t *reg_req;
130 const struct mpcp_reg_t *reg;
131 const struct mpcp_reg_ack_t *reg_ack;
132 } mpcp;
133
134
135 const u_char *tptr;
136 uint16_t opcode;
137 uint8_t grant_numbers, grant;
138 uint8_t queue_sets, queue_set, report_bitmap, report;
139
140 tptr=pptr;
141 mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
142
143 ND_TCHECK2(*tptr, sizeof(const struct mpcp_common_header_t));
144 opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
145 ND_PRINT((ndo, "MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode)));
146 if (opcode != MPCP_OPCODE_PAUSE) {
147 ND_PRINT((ndo, ", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp)));
148 }
149 ND_PRINT((ndo, ", length %u", length));
150
151 if (!ndo->ndo_vflag)
152 return;
153
154 tptr += sizeof(const struct mpcp_common_header_t);
155
156 switch (opcode) {
157 case MPCP_OPCODE_PAUSE:
158 break;
159
160 case MPCP_OPCODE_GATE:
161 ND_TCHECK2(*tptr, MPCP_GRANT_NUMBER_LEN);
162 grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
163 ND_PRINT((ndo, "\n\tGrant Numbers %u, Flags [ %s ]",
164 grant_numbers,
165 bittok2str(mpcp_grant_flag_values,
166 "?",
167 *tptr &~ MPCP_GRANT_NUMBER_MASK)));
168 tptr++;
169
170 for (grant = 1; grant <= grant_numbers; grant++) {
171 ND_TCHECK2(*tptr, sizeof(const struct mpcp_grant_t));
172 mpcp.grant = (const struct mpcp_grant_t *)tptr;
173 ND_PRINT((ndo, "\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
174 grant,
175 EXTRACT_32BITS(mpcp.grant->starttime),
176 EXTRACT_16BITS(mpcp.grant->duration)));
177 tptr += sizeof(const struct mpcp_grant_t);
178 }
179
180 ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
181 ND_PRINT((ndo, "\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr)));
182 break;
183
184
185 case MPCP_OPCODE_REPORT:
186 ND_TCHECK2(*tptr, MPCP_REPORT_QUEUESETS_LEN);
187 queue_sets = *tptr;
188 tptr+=MPCP_REPORT_QUEUESETS_LEN;
189 ND_PRINT((ndo, "\n\tTotal Queue-Sets %u", queue_sets));
190
191 for (queue_set = 1; queue_set < queue_sets; queue_set++) {
192 ND_TCHECK2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN);
193 report_bitmap = *(tptr);
194 ND_PRINT((ndo, "\n\t Queue-Set #%u, Report-Bitmap [ %s ]",
195 queue_sets,
196 bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap)));
197 tptr++;
198
199 report=1;
200 while (report_bitmap != 0) {
201 if (report_bitmap & 1) {
202 ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
203 ND_PRINT((ndo, "\n\t Q%u Report, Duration %u ticks",
204 report,
205 EXTRACT_16BITS(tptr)));
206 tptr+=MPCP_TIMESTAMP_DURATION_LEN;
207 }
208 report++;
209 report_bitmap = report_bitmap >> 1;
210 }
211 }
212 break;
213
214 case MPCP_OPCODE_REG_REQ:
215 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_req_t));
216 mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
217 ND_PRINT((ndo, "\n\tFlags [ %s ], Pending-Grants %u",
218 bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
219 mpcp.reg_req->pending_grants));
220 break;
221
222 case MPCP_OPCODE_REG:
223 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_t));
224 mpcp.reg = (const struct mpcp_reg_t *)tptr;
225 ND_PRINT((ndo, "\n\tAssigned-Port %u, Flags [ %s ]" \
226 "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
227 EXTRACT_16BITS(mpcp.reg->assigned_port),
228 bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
229 EXTRACT_16BITS(mpcp.reg->sync_time),
230 mpcp.reg->echoed_pending_grants));
231 break;
232
233 case MPCP_OPCODE_REG_ACK:
234 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_ack_t));
235 mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
236 ND_PRINT((ndo, "\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
237 "\n\tEchoed-Sync-Time %u ticks",
238 EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
239 bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
240 EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time)));
241 break;
242
243 default:
244 /* unknown opcode - hexdump for now */
245 print_unknown_data(ndo,pptr, "\n\t", length);
246 break;
247 }
248
249 return;
250
251 trunc:
252 ND_PRINT((ndo, "\n\t[|MPCP]"));
253 }
254 /*
255 * Local Variables:
256 * c-style: whitesmith
257 * c-basic-offset: 8
258 * End:
259 */
260