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 #ifndef lint
22 static const char rcsid[] _U_ =
23 "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.49 2007-10-22 19:37:51 guy Exp $ (LBL)";
24 #endif
25
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include <tcpdump-stdinc.h>
31
32 #include <stdio.h>
33 #include <pcap.h>
34 #include <string.h>
35
36 #include "interface.h"
37 #include "extract.h"
38 #include "addrtoname.h"
39 #include "ethertype.h"
40 #include "atm.h"
41 #include "atmuni31.h"
42 #include "llc.h"
43
44 #include "ether.h"
45
46 #define OAM_CRC10_MASK 0x3ff
47 #define OAM_PAYLOAD_LEN 48
48 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
49 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
50
51 static const struct tok oam_f_values[] = {
52 { VCI_OAMF4SC, "OAM F4 (segment)" },
53 { VCI_OAMF4EC, "OAM F4 (end)" },
54 { 0, NULL }
55 };
56
57 static const struct tok atm_pty_values[] = {
58 { 0x0, "user data, uncongested, SDU 0" },
59 { 0x1, "user data, uncongested, SDU 1" },
60 { 0x2, "user data, congested, SDU 0" },
61 { 0x3, "user data, congested, SDU 1" },
62 { 0x4, "VCC OAM F5 flow segment" },
63 { 0x5, "VCC OAM F5 flow end-to-end" },
64 { 0x6, "Traffic Control and resource Mgmt" },
65 { 0, NULL }
66 };
67
68 #define OAM_CELLTYPE_FM 0x1
69 #define OAM_CELLTYPE_PM 0x2
70 #define OAM_CELLTYPE_AD 0x8
71 #define OAM_CELLTYPE_SM 0xf
72
73 static const struct tok oam_celltype_values[] = {
74 { OAM_CELLTYPE_FM, "Fault Management" },
75 { OAM_CELLTYPE_PM, "Performance Management" },
76 { OAM_CELLTYPE_AD, "activate/deactivate" },
77 { OAM_CELLTYPE_SM, "System Management" },
78 { 0, NULL }
79 };
80
81 #define OAM_FM_FUNCTYPE_AIS 0x0
82 #define OAM_FM_FUNCTYPE_RDI 0x1
83 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
84 #define OAM_FM_FUNCTYPE_LOOPBACK 0x8
85
86 static const struct tok oam_fm_functype_values[] = {
87 { OAM_FM_FUNCTYPE_AIS, "AIS" },
88 { OAM_FM_FUNCTYPE_RDI, "RDI" },
89 { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
90 { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
91 { 0, NULL }
92 };
93
94 static const struct tok oam_pm_functype_values[] = {
95 { 0x0, "Forward Monitoring" },
96 { 0x1, "Backward Reporting" },
97 { 0x2, "Monitoring and Reporting" },
98 { 0, NULL }
99 };
100
101 static const struct tok oam_ad_functype_values[] = {
102 { 0x0, "Performance Monitoring" },
103 { 0x1, "Continuity Check" },
104 { 0, NULL }
105 };
106
107 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
108
109 static const struct tok oam_fm_loopback_indicator_values[] = {
110 { 0x0, "Reply" },
111 { 0x1, "Request" },
112 { 0, NULL }
113 };
114
115 static const struct tok *oam_functype_values[16] = {
116 NULL,
117 oam_fm_functype_values, /* 1 */
118 oam_pm_functype_values, /* 2 */
119 NULL,
120 NULL,
121 NULL,
122 NULL,
123 NULL,
124 oam_ad_functype_values, /* 8 */
125 NULL,
126 NULL,
127 NULL,
128 NULL,
129 NULL,
130 NULL,
131 NULL
132 };
133
134 /*
135 * Print an RFC 1483 LLC-encapsulated ATM frame.
136 */
137 static void
atm_llc_print(const u_char * p,int length,int caplen)138 atm_llc_print(const u_char *p, int length, int caplen)
139 {
140 u_short extracted_ethertype;
141
142 if (!llc_print(p, length, caplen, NULL, NULL,
143 &extracted_ethertype)) {
144 /* ether_type not known, print raw packet */
145 if (extracted_ethertype) {
146 printf("(LLC %s) ",
147 etherproto_string(htons(extracted_ethertype)));
148 }
149 if (!suppress_default_print)
150 default_print(p, caplen);
151 }
152 }
153
154 /*
155 * Given a SAP value, generate the LLC header value for a UI packet
156 * with that SAP as the source and destination SAP.
157 */
158 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
159
160 /*
161 * This is the top level routine of the printer. 'p' points
162 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
163 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
164 * is the number of bytes actually captured.
165 */
166 u_int
atm_if_print(const struct pcap_pkthdr * h,const u_char * p)167 atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
168 {
169 u_int caplen = h->caplen;
170 u_int length = h->len;
171 u_int32_t llchdr;
172 u_int hdrlen = 0;
173
174 if (caplen < 8) {
175 printf("[|atm]");
176 return (caplen);
177 }
178
179 /* Cisco Style NLPID ? */
180 if (*p == LLC_UI) {
181 if (eflag)
182 printf("CNLPID ");
183 isoclns_print(p+1, length-1, caplen-1);
184 return hdrlen;
185 }
186
187 /*
188 * Extract the presumed LLC header into a variable, for quick
189 * testing.
190 * Then check for a header that's neither a header for a SNAP
191 * packet nor an RFC 2684 routed NLPID-formatted PDU nor
192 * an 802.2-but-no-SNAP IP packet.
193 */
194 llchdr = EXTRACT_24BITS(p);
195 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
196 llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
197 llchdr != LLC_UI_HDR(LLCSAP_IP)) {
198 /*
199 * XXX - assume 802.6 MAC header from Fore driver.
200 *
201 * Unfortunately, the above list doesn't check for
202 * all known SAPs, doesn't check for headers where
203 * the source and destination SAP aren't the same,
204 * and doesn't check for non-UI frames. It also
205 * runs the risk of an 802.6 MAC header that happens
206 * to begin with one of those values being
207 * incorrectly treated as an 802.2 header.
208 *
209 * So is that Fore driver still around? And, if so,
210 * is it still putting 802.6 MAC headers on ATM
211 * packets? If so, could it be changed to use a
212 * new DLT_IEEE802_6 value if we added it?
213 */
214 if (eflag)
215 printf("%08x%08x %08x%08x ",
216 EXTRACT_32BITS(p),
217 EXTRACT_32BITS(p+4),
218 EXTRACT_32BITS(p+8),
219 EXTRACT_32BITS(p+12));
220 p += 20;
221 length -= 20;
222 caplen -= 20;
223 hdrlen += 20;
224 }
225 atm_llc_print(p, length, caplen);
226 return (hdrlen);
227 }
228
229 /*
230 * ATM signalling.
231 */
232 static const struct tok msgtype2str[] = {
233 { CALL_PROCEED, "Call_proceeding" },
234 { CONNECT, "Connect" },
235 { CONNECT_ACK, "Connect_ack" },
236 { SETUP, "Setup" },
237 { RELEASE, "Release" },
238 { RELEASE_DONE, "Release_complete" },
239 { RESTART, "Restart" },
240 { RESTART_ACK, "Restart_ack" },
241 { STATUS, "Status" },
242 { STATUS_ENQ, "Status_enquiry" },
243 { ADD_PARTY, "Add_party" },
244 { ADD_PARTY_ACK, "Add_party_ack" },
245 { ADD_PARTY_REJ, "Add_party_reject" },
246 { DROP_PARTY, "Drop_party" },
247 { DROP_PARTY_ACK, "Drop_party_ack" },
248 { 0, NULL }
249 };
250
251 static void
sig_print(const u_char * p,int caplen)252 sig_print(const u_char *p, int caplen)
253 {
254 bpf_u_int32 call_ref;
255
256 if (caplen < PROTO_POS) {
257 printf("[|atm]");
258 return;
259 }
260 if (p[PROTO_POS] == Q2931) {
261 /*
262 * protocol:Q.2931 for User to Network Interface
263 * (UNI 3.1) signalling
264 */
265 printf("Q.2931");
266 if (caplen < MSG_TYPE_POS) {
267 printf(" [|atm]");
268 return;
269 }
270 printf(":%s ",
271 tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
272
273 /*
274 * The call reference comes before the message type,
275 * so if we know we have the message type, which we
276 * do from the caplen test above, we also know we have
277 * the call reference.
278 */
279 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
280 printf("CALL_REF:0x%06x", call_ref);
281 } else {
282 /* SCCOP with some unknown protocol atop it */
283 printf("SSCOP, proto %d ", p[PROTO_POS]);
284 }
285 }
286
287 /*
288 * Print an ATM PDU (such as an AAL5 PDU).
289 */
290 void
atm_print(u_int vpi,u_int vci,u_int traftype,const u_char * p,u_int length,u_int caplen)291 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
292 u_int caplen)
293 {
294 if (eflag)
295 printf("VPI:%u VCI:%u ", vpi, vci);
296
297 if (vpi == 0) {
298 switch (vci) {
299
300 case VCI_PPC:
301 sig_print(p, caplen);
302 return;
303
304 case VCI_BCC:
305 printf("broadcast sig: ");
306 return;
307
308 case VCI_OAMF4SC: /* fall through */
309 case VCI_OAMF4EC:
310 oam_print(p, length, ATM_OAM_HEC);
311 return;
312
313 case VCI_METAC:
314 printf("meta: ");
315 return;
316
317 case VCI_ILMIC:
318 printf("ilmi: ");
319 snmp_print(p, length);
320 return;
321 }
322 }
323
324 switch (traftype) {
325
326 case ATM_LLC:
327 default:
328 /*
329 * Assumes traffic is LLC if unknown.
330 */
331 atm_llc_print(p, length, caplen);
332 break;
333
334 case ATM_LANE:
335 lane_print(p, length, caplen);
336 break;
337 }
338 }
339
340 struct oam_fm_loopback_t {
341 u_int8_t loopback_indicator;
342 u_int8_t correlation_tag[4];
343 u_int8_t loopback_id[12];
344 u_int8_t source_id[12];
345 u_int8_t unused[16];
346 };
347
348 struct oam_fm_ais_rdi_t {
349 u_int8_t failure_type;
350 u_int8_t failure_location[16];
351 u_int8_t unused[28];
352 };
353
354 int
oam_print(const u_char * p,u_int length,u_int hec)355 oam_print (const u_char *p, u_int length, u_int hec) {
356
357 u_int32_t cell_header;
358 u_int16_t vpi, vci, cksum, cksum_shouldbe, idx;
359 u_int8_t cell_type, func_type, payload, clp;
360
361 union {
362 const struct oam_fm_loopback_t *oam_fm_loopback;
363 const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
364 } oam_ptr;
365
366
367 cell_header = EXTRACT_32BITS(p+hec);
368 cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f;
369 func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f;
370
371 vpi = (cell_header>>20)&0xff;
372 vci = (cell_header>>4)&0xffff;
373 payload = (cell_header>>1)&0x7;
374 clp = cell_header&0x1;
375
376 printf("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
377 tok2str(oam_f_values, "OAM F5", vci),
378 vpi, vci,
379 tok2str(atm_pty_values, "Unknown", payload),
380 clp, length);
381
382 if (!vflag) {
383 return 1;
384 }
385
386 printf("\n\tcell-type %s (%u)",
387 tok2str(oam_celltype_values, "unknown", cell_type),
388 cell_type);
389
390 if (oam_functype_values[cell_type] == NULL)
391 printf(", func-type unknown (%u)", func_type);
392 else
393 printf(", func-type %s (%u)",
394 tok2str(oam_functype_values[cell_type],"none",func_type),
395 func_type);
396
397 p += ATM_HDR_LEN_NOHEC + hec;
398
399 switch (cell_type << 4 | func_type) {
400 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
401 oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
402 printf("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
403 tok2str(oam_fm_loopback_indicator_values,
404 "Unknown",
405 oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK),
406 EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag));
407 printf("\n\tLocation-ID ");
408 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
409 if (idx % 2) {
410 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx]));
411 }
412 }
413 printf("\n\tSource-ID ");
414 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
415 if (idx % 2) {
416 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx]));
417 }
418 }
419 break;
420
421 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
422 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
423 oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
424 printf("\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type);
425 printf("\n\tLocation-ID ");
426 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
427 if (idx % 2) {
428 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx]));
429 }
430 }
431 break;
432
433 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
434 /* FIXME */
435 break;
436
437 default:
438 break;
439 }
440
441 /* crc10 checksum verification */
442 cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
443 & OAM_CRC10_MASK;
444 cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
445
446 printf("\n\tcksum 0x%03x (%scorrect)",
447 cksum,
448 cksum_shouldbe == 0 ? "" : "in");
449
450 return 1;
451 }
452