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 #include <sys/cdefs.h>
21 #ifndef lint
22 __RCSID("$NetBSD: print-mpcp.c,v 1.8 2017/09/08 14:01:13 christos Exp $");
23 #endif
24
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28
29 #include <netdissect-stdinc.h>
30
31 #include "netdissect.h"
32 #include "extract.h"
33
34 #define MPCP_TIMESTAMP_LEN 4
35 #define MPCP_TIMESTAMP_DURATION_LEN 2
36
37 struct mpcp_common_header_t {
38 uint8_t opcode[2];
39 uint8_t timestamp[MPCP_TIMESTAMP_LEN];
40 };
41
42 #define MPCP_OPCODE_PAUSE 0x0001
43 #define MPCP_OPCODE_GATE 0x0002
44 #define MPCP_OPCODE_REPORT 0x0003
45 #define MPCP_OPCODE_REG_REQ 0x0004
46 #define MPCP_OPCODE_REG 0x0005
47 #define MPCP_OPCODE_REG_ACK 0x0006
48
49 static const struct tok mpcp_opcode_values[] = {
50 { MPCP_OPCODE_PAUSE, "Pause" },
51 { MPCP_OPCODE_GATE, "Gate" },
52 { MPCP_OPCODE_REPORT, "Report" },
53 { MPCP_OPCODE_REG_REQ, "Register Request" },
54 { MPCP_OPCODE_REG, "Register" },
55 { MPCP_OPCODE_REG_ACK, "Register ACK" },
56 { 0, NULL}
57 };
58
59 #define MPCP_GRANT_NUMBER_LEN 1
60 #define MPCP_GRANT_NUMBER_MASK 0x7
61 static const struct tok mpcp_grant_flag_values[] = {
62 { 0x08, "Discovery" },
63 { 0x10, "Force Grant #1" },
64 { 0x20, "Force Grant #2" },
65 { 0x40, "Force Grant #3" },
66 { 0x80, "Force Grant #4" },
67 { 0, NULL}
68 };
69
70 struct mpcp_grant_t {
71 uint8_t starttime[MPCP_TIMESTAMP_LEN];
72 uint8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
73 };
74
75 struct mpcp_reg_req_t {
76 uint8_t flags;
77 uint8_t pending_grants;
78 };
79
80
81 static const struct tok mpcp_reg_req_flag_values[] = {
82 { 1, "Register" },
83 { 3, "De-Register" },
84 { 0, NULL}
85 };
86
87 struct mpcp_reg_t {
88 uint8_t assigned_port[2];
89 uint8_t flags;
90 uint8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
91 uint8_t echoed_pending_grants;
92 };
93
94 static const struct tok mpcp_reg_flag_values[] = {
95 { 1, "Re-Register" },
96 { 2, "De-Register" },
97 { 3, "ACK" },
98 { 4, "NACK" },
99 { 0, NULL}
100 };
101
102 #define MPCP_REPORT_QUEUESETS_LEN 1
103 #define MPCP_REPORT_REPORTBITMAP_LEN 1
104 static const struct tok mpcp_report_bitmap_values[] = {
105 { 0x01, "Q0" },
106 { 0x02, "Q1" },
107 { 0x04, "Q2" },
108 { 0x08, "Q3" },
109 { 0x10, "Q4" },
110 { 0x20, "Q5" },
111 { 0x40, "Q6" },
112 { 0x80, "Q7" },
113 { 0, NULL}
114 };
115
116 struct mpcp_reg_ack_t {
117 uint8_t flags;
118 uint8_t echoed_assigned_port[2];
119 uint8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
120 };
121
122 static const struct tok mpcp_reg_ack_flag_values[] = {
123 { 0, "NACK" },
124 { 1, "ACK" },
125 { 0, NULL}
126 };
127
128 void
mpcp_print(netdissect_options * ndo,register const u_char * pptr,register u_int length)129 mpcp_print(netdissect_options *ndo, register const u_char *pptr, register u_int length)
130 {
131 union {
132 const struct mpcp_common_header_t *common_header;
133 const struct mpcp_grant_t *grant;
134 const struct mpcp_reg_req_t *reg_req;
135 const struct mpcp_reg_t *reg;
136 const struct mpcp_reg_ack_t *reg_ack;
137 } mpcp;
138
139
140 const u_char *tptr;
141 uint16_t opcode;
142 uint8_t grant_numbers, grant;
143 uint8_t queue_sets, queue_set, report_bitmap, report;
144
145 tptr=pptr;
146 mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
147
148 ND_TCHECK2(*tptr, sizeof(const struct mpcp_common_header_t));
149 opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
150 ND_PRINT((ndo, "MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode)));
151 if (opcode != MPCP_OPCODE_PAUSE) {
152 ND_PRINT((ndo, ", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp)));
153 }
154 ND_PRINT((ndo, ", length %u", length));
155
156 if (!ndo->ndo_vflag)
157 return;
158
159 tptr += sizeof(const struct mpcp_common_header_t);
160
161 switch (opcode) {
162 case MPCP_OPCODE_PAUSE:
163 break;
164
165 case MPCP_OPCODE_GATE:
166 ND_TCHECK2(*tptr, MPCP_GRANT_NUMBER_LEN);
167 grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
168 ND_PRINT((ndo, "\n\tGrant Numbers %u, Flags [ %s ]",
169 grant_numbers,
170 bittok2str(mpcp_grant_flag_values,
171 "?",
172 *tptr &~ MPCP_GRANT_NUMBER_MASK)));
173 tptr++;
174
175 for (grant = 1; grant <= grant_numbers; grant++) {
176 ND_TCHECK2(*tptr, sizeof(const struct mpcp_grant_t));
177 mpcp.grant = (const struct mpcp_grant_t *)tptr;
178 ND_PRINT((ndo, "\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
179 grant,
180 EXTRACT_32BITS(mpcp.grant->starttime),
181 EXTRACT_16BITS(mpcp.grant->duration)));
182 tptr += sizeof(const struct mpcp_grant_t);
183 }
184
185 ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
186 ND_PRINT((ndo, "\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr)));
187 break;
188
189
190 case MPCP_OPCODE_REPORT:
191 ND_TCHECK2(*tptr, MPCP_REPORT_QUEUESETS_LEN);
192 queue_sets = *tptr;
193 tptr+=MPCP_REPORT_QUEUESETS_LEN;
194 ND_PRINT((ndo, "\n\tTotal Queue-Sets %u", queue_sets));
195
196 for (queue_set = 1; queue_set < queue_sets; queue_set++) {
197 ND_TCHECK2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN);
198 report_bitmap = *(tptr);
199 ND_PRINT((ndo, "\n\t Queue-Set #%u, Report-Bitmap [ %s ]",
200 queue_sets,
201 bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap)));
202 tptr++;
203
204 report=1;
205 while (report_bitmap != 0) {
206 if (report_bitmap & 1) {
207 ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
208 ND_PRINT((ndo, "\n\t Q%u Report, Duration %u ticks",
209 report,
210 EXTRACT_16BITS(tptr)));
211 tptr+=MPCP_TIMESTAMP_DURATION_LEN;
212 }
213 report++;
214 report_bitmap = report_bitmap >> 1;
215 }
216 }
217 break;
218
219 case MPCP_OPCODE_REG_REQ:
220 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_req_t));
221 mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
222 ND_PRINT((ndo, "\n\tFlags [ %s ], Pending-Grants %u",
223 bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
224 mpcp.reg_req->pending_grants));
225 break;
226
227 case MPCP_OPCODE_REG:
228 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_t));
229 mpcp.reg = (const struct mpcp_reg_t *)tptr;
230 ND_PRINT((ndo, "\n\tAssigned-Port %u, Flags [ %s ]" \
231 "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
232 EXTRACT_16BITS(mpcp.reg->assigned_port),
233 bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
234 EXTRACT_16BITS(mpcp.reg->sync_time),
235 mpcp.reg->echoed_pending_grants));
236 break;
237
238 case MPCP_OPCODE_REG_ACK:
239 ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_ack_t));
240 mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
241 ND_PRINT((ndo, "\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
242 "\n\tEchoed-Sync-Time %u ticks",
243 EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
244 bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
245 EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time)));
246 break;
247
248 default:
249 /* unknown opcode - hexdump for now */
250 print_unknown_data(ndo,pptr, "\n\t", length);
251 break;
252 }
253
254 return;
255
256 trunc:
257 ND_PRINT((ndo, "\n\t[|MPCP]"));
258 }
259 /*
260 * Local Variables:
261 * c-style: whitesmith
262 * c-basic-offset: 8
263 * End:
264 */
265