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1 office 1 /*
2 * Copyright (c) 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21  
22 #define NETDISSECT_REWORKED
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26  
27 #include <tcpdump-stdinc.h>
28  
29 #include "interface.h"
30 #include "extract.h"
31 #include "addrtoname.h"
32 #include "atm.h"
33 #include "atmuni31.h"
34 #include "llc.h"
35  
36 static const char tstr[] = "[|atm]";
37  
38 #define OAM_CRC10_MASK 0x3ff
39 #define OAM_PAYLOAD_LEN 48
40 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
41 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
42  
43 static const struct tok oam_f_values[] = {
44 { VCI_OAMF4SC, "OAM F4 (segment)" },
45 { VCI_OAMF4EC, "OAM F4 (end)" },
46 { 0, NULL }
47 };
48  
49 static const struct tok atm_pty_values[] = {
50 { 0x0, "user data, uncongested, SDU 0" },
51 { 0x1, "user data, uncongested, SDU 1" },
52 { 0x2, "user data, congested, SDU 0" },
53 { 0x3, "user data, congested, SDU 1" },
54 { 0x4, "VCC OAM F5 flow segment" },
55 { 0x5, "VCC OAM F5 flow end-to-end" },
56 { 0x6, "Traffic Control and resource Mgmt" },
57 { 0, NULL }
58 };
59  
60 #define OAM_CELLTYPE_FM 0x1
61 #define OAM_CELLTYPE_PM 0x2
62 #define OAM_CELLTYPE_AD 0x8
63 #define OAM_CELLTYPE_SM 0xf
64  
65 static const struct tok oam_celltype_values[] = {
66 { OAM_CELLTYPE_FM, "Fault Management" },
67 { OAM_CELLTYPE_PM, "Performance Management" },
68 { OAM_CELLTYPE_AD, "activate/deactivate" },
69 { OAM_CELLTYPE_SM, "System Management" },
70 { 0, NULL }
71 };
72  
73 #define OAM_FM_FUNCTYPE_AIS 0x0
74 #define OAM_FM_FUNCTYPE_RDI 0x1
75 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
76 #define OAM_FM_FUNCTYPE_LOOPBACK 0x8
77  
78 static const struct tok oam_fm_functype_values[] = {
79 { OAM_FM_FUNCTYPE_AIS, "AIS" },
80 { OAM_FM_FUNCTYPE_RDI, "RDI" },
81 { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
82 { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
83 { 0, NULL }
84 };
85  
86 static const struct tok oam_pm_functype_values[] = {
87 { 0x0, "Forward Monitoring" },
88 { 0x1, "Backward Reporting" },
89 { 0x2, "Monitoring and Reporting" },
90 { 0, NULL }
91 };
92  
93 static const struct tok oam_ad_functype_values[] = {
94 { 0x0, "Performance Monitoring" },
95 { 0x1, "Continuity Check" },
96 { 0, NULL }
97 };
98  
99 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
100  
101 static const struct tok oam_fm_loopback_indicator_values[] = {
102 { 0x0, "Reply" },
103 { 0x1, "Request" },
104 { 0, NULL }
105 };
106  
107 static const struct tok *oam_functype_values[16] = {
108 NULL,
109 oam_fm_functype_values, /* 1 */
110 oam_pm_functype_values, /* 2 */
111 NULL,
112 NULL,
113 NULL,
114 NULL,
115 NULL,
116 oam_ad_functype_values, /* 8 */
117 NULL,
118 NULL,
119 NULL,
120 NULL,
121 NULL,
122 NULL,
123 NULL
124 };
125  
126 /*
127 * Print an RFC 1483 LLC-encapsulated ATM frame.
128 */
129 static void
130 atm_llc_print(netdissect_options *ndo,
131 const u_char *p, int length, int caplen)
132 {
133 u_short extracted_ethertype;
134  
135 if (!llc_print(ndo, p, length, caplen, NULL, NULL,
136 &extracted_ethertype)) {
137 /* ether_type not known, print raw packet */
138 if (extracted_ethertype) {
139 ND_PRINT((ndo, "(LLC %s) ",
140 etherproto_string(htons(extracted_ethertype))));
141 }
142 if (!ndo->ndo_suppress_default_print)
143 ND_DEFAULTPRINT(p, caplen);
144 }
145 }
146  
147 /*
148 * Given a SAP value, generate the LLC header value for a UI packet
149 * with that SAP as the source and destination SAP.
150 */
151 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
152  
153 /*
154 * This is the top level routine of the printer. 'p' points
155 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
156 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
157 * is the number of bytes actually captured.
158 */
159 u_int
160 atm_if_print(netdissect_options *ndo,
161 const struct pcap_pkthdr *h, const u_char *p)
162 {
163 u_int caplen = h->caplen;
164 u_int length = h->len;
165 uint32_t llchdr;
166 u_int hdrlen = 0;
167  
168 if (caplen < 1 || length < 1) {
169 ND_PRINT((ndo, "%s", tstr));
170 return (caplen);
171 }
172  
173 /* Cisco Style NLPID ? */
174 if (*p == LLC_UI) {
175 if (ndo->ndo_eflag)
176 ND_PRINT((ndo, "CNLPID "));
177 isoclns_print(ndo, p + 1, length - 1, caplen - 1);
178 return hdrlen;
179 }
180  
181 /*
182 * Must have at least a DSAP, an SSAP, and the first byte of the
183 * control field.
184 */
185 if (caplen < 3 || length < 3) {
186 ND_PRINT((ndo, "%s", tstr));
187 return (caplen);
188 }
189  
190 /*
191 * Extract the presumed LLC header into a variable, for quick
192 * testing.
193 * Then check for a header that's neither a header for a SNAP
194 * packet nor an RFC 2684 routed NLPID-formatted PDU nor
195 * an 802.2-but-no-SNAP IP packet.
196 */
197 llchdr = EXTRACT_24BITS(p);
198 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
199 llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
200 llchdr != LLC_UI_HDR(LLCSAP_IP)) {
201 /*
202 * XXX - assume 802.6 MAC header from Fore driver.
203 *
204 * Unfortunately, the above list doesn't check for
205 * all known SAPs, doesn't check for headers where
206 * the source and destination SAP aren't the same,
207 * and doesn't check for non-UI frames. It also
208 * runs the risk of an 802.6 MAC header that happens
209 * to begin with one of those values being
210 * incorrectly treated as an 802.2 header.
211 *
212 * So is that Fore driver still around? And, if so,
213 * is it still putting 802.6 MAC headers on ATM
214 * packets? If so, could it be changed to use a
215 * new DLT_IEEE802_6 value if we added it?
216 */
217 if (caplen < 20 || length < 20) {
218 ND_PRINT((ndo, "%s", tstr));
219 return (caplen);
220 }
221 if (ndo->ndo_eflag)
222 ND_PRINT((ndo, "%08x%08x %08x%08x ",
223 EXTRACT_32BITS(p),
224 EXTRACT_32BITS(p+4),
225 EXTRACT_32BITS(p+8),
226 EXTRACT_32BITS(p+12)));
227 p += 20;
228 length -= 20;
229 caplen -= 20;
230 hdrlen += 20;
231 }
232 atm_llc_print(ndo, p, length, caplen);
233 return (hdrlen);
234 }
235  
236 /*
237 * ATM signalling.
238 */
239 static const struct tok msgtype2str[] = {
240 { CALL_PROCEED, "Call_proceeding" },
241 { CONNECT, "Connect" },
242 { CONNECT_ACK, "Connect_ack" },
243 { SETUP, "Setup" },
244 { RELEASE, "Release" },
245 { RELEASE_DONE, "Release_complete" },
246 { RESTART, "Restart" },
247 { RESTART_ACK, "Restart_ack" },
248 { STATUS, "Status" },
249 { STATUS_ENQ, "Status_enquiry" },
250 { ADD_PARTY, "Add_party" },
251 { ADD_PARTY_ACK, "Add_party_ack" },
252 { ADD_PARTY_REJ, "Add_party_reject" },
253 { DROP_PARTY, "Drop_party" },
254 { DROP_PARTY_ACK, "Drop_party_ack" },
255 { 0, NULL }
256 };
257  
258 static void
259 sig_print(netdissect_options *ndo,
260 const u_char *p, int caplen)
261 {
262 uint32_t call_ref;
263  
264 if (caplen < PROTO_POS) {
265 ND_PRINT((ndo, "%s", tstr));
266 return;
267 }
268 if (p[PROTO_POS] == Q2931) {
269 /*
270 * protocol:Q.2931 for User to Network Interface
271 * (UNI 3.1) signalling
272 */
273 ND_PRINT((ndo, "Q.2931"));
274 if (caplen < MSG_TYPE_POS) {
275 ND_PRINT((ndo, " %s", tstr));
276 return;
277 }
278 ND_PRINT((ndo, ":%s ",
279 tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])));
280  
281 /*
282 * The call reference comes before the message type,
283 * so if we know we have the message type, which we
284 * do from the caplen test above, we also know we have
285 * the call reference.
286 */
287 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
288 ND_PRINT((ndo, "CALL_REF:0x%06x", call_ref));
289 } else {
290 /* SCCOP with some unknown protocol atop it */
291 ND_PRINT((ndo, "SSCOP, proto %d ", p[PROTO_POS]));
292 }
293 }
294  
295 /*
296 * Print an ATM PDU (such as an AAL5 PDU).
297 */
298 void
299 atm_print(netdissect_options *ndo,
300 u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
301 u_int caplen)
302 {
303 if (ndo->ndo_eflag)
304 ND_PRINT((ndo, "VPI:%u VCI:%u ", vpi, vci));
305  
306 if (vpi == 0) {
307 switch (vci) {
308  
309 case VCI_PPC:
310 sig_print(ndo, p, caplen);
311 return;
312  
313 case VCI_BCC:
314 ND_PRINT((ndo, "broadcast sig: "));
315 return;
316  
317 case VCI_OAMF4SC: /* fall through */
318 case VCI_OAMF4EC:
319 oam_print(ndo, p, length, ATM_OAM_HEC);
320 return;
321  
322 case VCI_METAC:
323 ND_PRINT((ndo, "meta: "));
324 return;
325  
326 case VCI_ILMIC:
327 ND_PRINT((ndo, "ilmi: "));
328 snmp_print(ndo, p, length);
329 return;
330 }
331 }
332  
333 switch (traftype) {
334  
335 case ATM_LLC:
336 default:
337 /*
338 * Assumes traffic is LLC if unknown.
339 */
340 atm_llc_print(ndo, p, length, caplen);
341 break;
342  
343 case ATM_LANE:
344 lane_print(ndo, p, length, caplen);
345 break;
346 }
347 }
348  
349 struct oam_fm_loopback_t {
350 uint8_t loopback_indicator;
351 uint8_t correlation_tag[4];
352 uint8_t loopback_id[12];
353 uint8_t source_id[12];
354 uint8_t unused[16];
355 };
356  
357 struct oam_fm_ais_rdi_t {
358 uint8_t failure_type;
359 uint8_t failure_location[16];
360 uint8_t unused[28];
361 };
362  
363 int
364 oam_print (netdissect_options *ndo,
365 const u_char *p, u_int length, u_int hec)
366 {
367 uint32_t cell_header;
368 uint16_t vpi, vci, cksum, cksum_shouldbe, idx;
369 uint8_t cell_type, func_type, payload, clp;
370  
371 union {
372 const struct oam_fm_loopback_t *oam_fm_loopback;
373 const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
374 } oam_ptr;
375  
376  
377 cell_header = EXTRACT_32BITS(p+hec);
378 cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f;
379 func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f;
380  
381 vpi = (cell_header>>20)&0xff;
382 vci = (cell_header>>4)&0xffff;
383 payload = (cell_header>>1)&0x7;
384 clp = cell_header&0x1;
385  
386 ND_PRINT((ndo, "%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
387 tok2str(oam_f_values, "OAM F5", vci),
388 vpi, vci,
389 tok2str(atm_pty_values, "Unknown", payload),
390 clp, length));
391  
392 if (!ndo->ndo_vflag) {
393 return 1;
394 }
395  
396 ND_PRINT((ndo, "\n\tcell-type %s (%u)",
397 tok2str(oam_celltype_values, "unknown", cell_type),
398 cell_type));
399  
400 if (oam_functype_values[cell_type] == NULL)
401 ND_PRINT((ndo, ", func-type unknown (%u)", func_type));
402 else
403 ND_PRINT((ndo, ", func-type %s (%u)",
404 tok2str(oam_functype_values[cell_type],"none",func_type),
405 func_type));
406  
407 p += ATM_HDR_LEN_NOHEC + hec;
408  
409 switch (cell_type << 4 | func_type) {
410 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
411 oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
412 ND_PRINT((ndo, "\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
413 tok2str(oam_fm_loopback_indicator_values,
414 "Unknown",
415 oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK),
416 EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag)));
417 ND_PRINT((ndo, "\n\tLocation-ID "));
418 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
419 if (idx % 2) {
420 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx])));
421 }
422 }
423 ND_PRINT((ndo, "\n\tSource-ID "));
424 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
425 if (idx % 2) {
426 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx])));
427 }
428 }
429 break;
430  
431 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
432 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
433 oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
434 ND_PRINT((ndo, "\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type));
435 ND_PRINT((ndo, "\n\tLocation-ID "));
436 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
437 if (idx % 2) {
438 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx])));
439 }
440 }
441 break;
442  
443 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
444 /* FIXME */
445 break;
446  
447 default:
448 break;
449 }
450  
451 /* crc10 checksum verification */
452 cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
453 & OAM_CRC10_MASK;
454 cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
455  
456 ND_PRINT((ndo, "\n\tcksum 0x%03x (%scorrect)",
457 cksum,
458 cksum_shouldbe == 0 ? "" : "in"));
459  
460 return 1;
461 }