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 /* \summary: Asynchronous Transfer Mode (ATM) printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include "netdissect-stdinc.h"
29
30 #define ND_LONGJMP_FROM_TCHECK
31 #include "netdissect.h"
32 #include "extract.h"
33 #include "addrtoname.h"
34 #include "atm.h"
35 #include "llc.h"
36
37 /* start of the original atmuni31.h */
38
39 /*
40 * Copyright (c) 1997 Yen Yen Lim and North Dakota State University
41 * All rights reserved.
42 *
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. All advertising materials mentioning features or use of this software
52 * must display the following acknowledgement:
53 * This product includes software developed by Yen Yen Lim and
54 North Dakota State University
55 * 4. The name of the author may not be used to endorse or promote products
56 * derived from this software without specific prior written permission.
57 *
58 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
59 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
60 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
61 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
62 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
63 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
64 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
66 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
67 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
68 * POSSIBILITY OF SUCH DAMAGE.
69 */
70
71 /* Based on UNI3.1 standard by ATM Forum */
72
73 /* ATM traffic types based on VPI=0 and (the following VCI */
74 #define VCI_PPC 0x05 /* Point-to-point signal msg */
75 #define VCI_BCC 0x02 /* Broadcast signal msg */
76 #define VCI_OAMF4SC 0x03 /* Segment OAM F4 flow cell */
77 #define VCI_OAMF4EC 0x04 /* End-to-end OAM F4 flow cell */
78 #define VCI_METAC 0x01 /* Meta signal msg */
79 #define VCI_ILMIC 0x10 /* ILMI msg */
80
81 /* Q.2931 signalling messages */
82 #define CALL_PROCEED 0x02 /* call proceeding */
83 #define CONNECT 0x07 /* connect */
84 #define CONNECT_ACK 0x0f /* connect_ack */
85 #define SETUP 0x05 /* setup */
86 #define RELEASE 0x4d /* release */
87 #define RELEASE_DONE 0x5a /* release_done */
88 #define RESTART 0x46 /* restart */
89 #define RESTART_ACK 0x4e /* restart ack */
90 #define STATUS 0x7d /* status */
91 #define STATUS_ENQ 0x75 /* status ack */
92 #define ADD_PARTY 0x80 /* add party */
93 #define ADD_PARTY_ACK 0x81 /* add party ack */
94 #define ADD_PARTY_REJ 0x82 /* add party rej */
95 #define DROP_PARTY 0x83 /* drop party */
96 #define DROP_PARTY_ACK 0x84 /* drop party ack */
97
98 /* Information Element Parameters in the signalling messages */
99 #define CAUSE 0x08 /* cause */
100 #define ENDPT_REF 0x54 /* endpoint reference */
101 #define AAL_PARA 0x58 /* ATM adaptation layer parameters */
102 #define TRAFF_DESCRIP 0x59 /* atm traffic descriptors */
103 #define CONNECT_ID 0x5a /* connection identifier */
104 #define QOS_PARA 0x5c /* quality of service parameters */
105 #define B_HIGHER 0x5d /* broadband higher layer information */
106 #define B_BEARER 0x5e /* broadband bearer capability */
107 #define B_LOWER 0x5f /* broadband lower information */
108 #define CALLING_PARTY 0x6c /* calling party number */
109 #define CALLED_PARTY 0x70 /* called party nmber */
110
111 #define Q2931 0x09
112
113 /* Q.2931 signalling general messages format */
114 #define PROTO_POS 0 /* offset of protocol discriminator */
115 #define CALL_REF_POS 2 /* offset of call reference value */
116 #define MSG_TYPE_POS 5 /* offset of message type */
117 #if 0
118 #define MSG_LEN_POS 7 /* offset of message length */
119 #define IE_BEGIN_POS 9 /* offset of first information element */
120
121 /* format of signalling messages */
122 #define TYPE_POS 0
123 #define LEN_POS 2
124 #define FIELD_BEGIN_POS 4
125 #endif
126
127 /* end of the original atmuni31.h */
128
129
130 #define OAM_CRC10_MASK 0x3ff
131 #define OAM_PAYLOAD_LEN 48
132 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */
133 #define OAM_CELLTYPE_FUNCTYPE_LEN 1
134
135 static const struct tok oam_f_values[] = {
136 { VCI_OAMF4SC, "OAM F4 (segment)" },
137 { VCI_OAMF4EC, "OAM F4 (end)" },
138 { 0, NULL }
139 };
140
141 static const struct tok atm_pty_values[] = {
142 { 0x0, "user data, uncongested, SDU 0" },
143 { 0x1, "user data, uncongested, SDU 1" },
144 { 0x2, "user data, congested, SDU 0" },
145 { 0x3, "user data, congested, SDU 1" },
146 { 0x4, "VCC OAM F5 flow segment" },
147 { 0x5, "VCC OAM F5 flow end-to-end" },
148 { 0x6, "Traffic Control and resource Mgmt" },
149 { 0, NULL }
150 };
151
152 #define OAM_CELLTYPE_FM 0x1
153 #define OAM_CELLTYPE_PM 0x2
154 #define OAM_CELLTYPE_AD 0x8
155 #define OAM_CELLTYPE_SM 0xf
156
157 static const struct tok oam_celltype_values[] = {
158 { OAM_CELLTYPE_FM, "Fault Management" },
159 { OAM_CELLTYPE_PM, "Performance Management" },
160 { OAM_CELLTYPE_AD, "activate/deactivate" },
161 { OAM_CELLTYPE_SM, "System Management" },
162 { 0, NULL }
163 };
164
165 #define OAM_FM_FUNCTYPE_AIS 0x0
166 #define OAM_FM_FUNCTYPE_RDI 0x1
167 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4
168 #define OAM_FM_FUNCTYPE_LOOPBACK 0x8
169
170 static const struct tok oam_fm_functype_values[] = {
171 { OAM_FM_FUNCTYPE_AIS, "AIS" },
172 { OAM_FM_FUNCTYPE_RDI, "RDI" },
173 { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" },
174 { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" },
175 { 0, NULL }
176 };
177
178 static const struct tok oam_pm_functype_values[] = {
179 { 0x0, "Forward Monitoring" },
180 { 0x1, "Backward Reporting" },
181 { 0x2, "Monitoring and Reporting" },
182 { 0, NULL }
183 };
184
185 static const struct tok oam_ad_functype_values[] = {
186 { 0x0, "Performance Monitoring" },
187 { 0x1, "Continuity Check" },
188 { 0, NULL }
189 };
190
191 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1
192
193 static const struct tok oam_fm_loopback_indicator_values[] = {
194 { 0x0, "Reply" },
195 { 0x1, "Request" },
196 { 0, NULL }
197 };
198
199 static const struct uint_tokary oam_celltype2tokary[] = {
200 { OAM_CELLTYPE_FM, oam_fm_functype_values },
201 { OAM_CELLTYPE_PM, oam_pm_functype_values },
202 { OAM_CELLTYPE_AD, oam_ad_functype_values },
203 /* uint2tokary() does not use array termination. */
204 };
205
206 /*
207 * Print an RFC 1483 LLC-encapsulated ATM frame.
208 */
209 static u_int
atm_llc_print(netdissect_options * ndo,const u_char * p,int length,int caplen)210 atm_llc_print(netdissect_options *ndo,
211 const u_char *p, int length, int caplen)
212 {
213 int llc_hdrlen;
214
215 llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
216 if (llc_hdrlen < 0) {
217 /* packet not known, print raw packet */
218 if (!ndo->ndo_suppress_default_print)
219 ND_DEFAULTPRINT(p, caplen);
220 llc_hdrlen = -llc_hdrlen;
221 }
222 return (llc_hdrlen);
223 }
224
225 /*
226 * Given a SAP value, generate the LLC header value for a UI packet
227 * with that SAP as the source and destination SAP.
228 */
229 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03)
230
231 /*
232 * This is the top level routine of the printer. 'p' points
233 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
234 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
235 * is the number of bytes actually captured.
236 */
237 void
atm_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)238 atm_if_print(netdissect_options *ndo,
239 const struct pcap_pkthdr *h, const u_char *p)
240 {
241 u_int caplen = h->caplen;
242 u_int length = h->len;
243 uint32_t llchdr;
244 u_int hdrlen = 0;
245
246 ndo->ndo_protocol = "atm";
247
248 /* Cisco Style NLPID ? */
249 if (GET_U_1(p) == LLC_UI) {
250 if (ndo->ndo_eflag)
251 ND_PRINT("CNLPID ");
252 ndo->ndo_ll_hdr_len += 1;
253 isoclns_print(ndo, p + 1, length - 1);
254 return;
255 }
256
257 /*
258 * Must have at least a DSAP, an SSAP, and the first byte of the
259 * control field.
260 */
261
262 /*
263 * Extract the presumed LLC header into a variable, for quick
264 * testing.
265 * Then check for a header that's neither a header for a SNAP
266 * packet nor an RFC 2684 routed NLPID-formatted PDU nor
267 * an 802.2-but-no-SNAP IP packet.
268 */
269 llchdr = GET_BE_U_3(p);
270 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
271 llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
272 llchdr != LLC_UI_HDR(LLCSAP_IP)) {
273 /*
274 * XXX - assume 802.6 MAC header from Fore driver.
275 *
276 * Unfortunately, the above list doesn't check for
277 * all known SAPs, doesn't check for headers where
278 * the source and destination SAP aren't the same,
279 * and doesn't check for non-UI frames. It also
280 * runs the risk of an 802.6 MAC header that happens
281 * to begin with one of those values being
282 * incorrectly treated as an 802.2 header.
283 *
284 * So is that Fore driver still around? And, if so,
285 * is it still putting 802.6 MAC headers on ATM
286 * packets? If so, could it be changed to use a
287 * new DLT_IEEE802_6 value if we added it?
288 */
289 if (ndo->ndo_eflag)
290 ND_PRINT("%08x%08x %08x%08x ",
291 GET_BE_U_4(p),
292 GET_BE_U_4(p + 4),
293 GET_BE_U_4(p + 8),
294 GET_BE_U_4(p + 12));
295 /* Always cover the full header. */
296 ND_TCHECK_LEN(p, 20);
297 p += 20;
298 length -= 20;
299 caplen -= 20;
300 hdrlen += 20;
301 }
302 ndo->ndo_ll_hdr_len += hdrlen;
303 ndo->ndo_ll_hdr_len += atm_llc_print(ndo, p, length, caplen);
304 }
305
306 /*
307 * ATM signalling.
308 */
309 static const struct tok msgtype2str[] = {
310 { CALL_PROCEED, "Call_proceeding" },
311 { CONNECT, "Connect" },
312 { CONNECT_ACK, "Connect_ack" },
313 { SETUP, "Setup" },
314 { RELEASE, "Release" },
315 { RELEASE_DONE, "Release_complete" },
316 { RESTART, "Restart" },
317 { RESTART_ACK, "Restart_ack" },
318 { STATUS, "Status" },
319 { STATUS_ENQ, "Status_enquiry" },
320 { ADD_PARTY, "Add_party" },
321 { ADD_PARTY_ACK, "Add_party_ack" },
322 { ADD_PARTY_REJ, "Add_party_reject" },
323 { DROP_PARTY, "Drop_party" },
324 { DROP_PARTY_ACK, "Drop_party_ack" },
325 { 0, NULL }
326 };
327
328 static void
sig_print(netdissect_options * ndo,const u_char * p)329 sig_print(netdissect_options *ndo,
330 const u_char *p)
331 {
332 uint32_t call_ref;
333
334 if (GET_U_1(p + PROTO_POS) == Q2931) {
335 /*
336 * protocol:Q.2931 for User to Network Interface
337 * (UNI 3.1) signalling
338 */
339 ND_PRINT("Q.2931");
340 ND_PRINT(":%s ",
341 tok2str(msgtype2str, "msgtype#%u", GET_U_1(p + MSG_TYPE_POS)));
342
343 /*
344 * The call reference comes before the message type,
345 * so if we know we have the message type, which we
346 * do from the caplen test above, we also know we have
347 * the call reference.
348 */
349 call_ref = GET_BE_U_3(p + CALL_REF_POS);
350 ND_PRINT("CALL_REF:0x%06x", call_ref);
351 } else {
352 /* SSCOP with some unknown protocol atop it */
353 ND_PRINT("SSCOP, proto %u ", GET_U_1(p + PROTO_POS));
354 }
355 }
356
357 /*
358 * Print an ATM PDU (such as an AAL5 PDU).
359 */
360 void
atm_print(netdissect_options * ndo,u_int vpi,u_int vci,u_int traftype,const u_char * p,u_int length,u_int caplen)361 atm_print(netdissect_options *ndo,
362 u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
363 u_int caplen)
364 {
365 ndo->ndo_protocol = "atm";
366 if (ndo->ndo_eflag)
367 ND_PRINT("VPI:%u VCI:%u ", vpi, vci);
368
369 if (vpi == 0) {
370 switch (vci) {
371
372 case VCI_PPC:
373 sig_print(ndo, p);
374 return;
375
376 case VCI_BCC:
377 ND_PRINT("broadcast sig: ");
378 return;
379
380 case VCI_OAMF4SC: /* fall through */
381 case VCI_OAMF4EC:
382 oam_print(ndo, p, length, ATM_OAM_HEC);
383 return;
384
385 case VCI_METAC:
386 ND_PRINT("meta: ");
387 return;
388
389 case VCI_ILMIC:
390 ND_PRINT("ilmi: ");
391 snmp_print(ndo, p, length);
392 return;
393 }
394 }
395
396 switch (traftype) {
397
398 case ATM_LLC:
399 default:
400 /*
401 * Assumes traffic is LLC if unknown.
402 */
403 atm_llc_print(ndo, p, length, caplen);
404 break;
405
406 case ATM_LANE:
407 lane_print(ndo, p, length, caplen);
408 break;
409 }
410 }
411
412 struct oam_fm_loopback_t {
413 nd_uint8_t loopback_indicator;
414 nd_uint32_t correlation_tag;
415 nd_byte loopback_id[12];
416 nd_byte source_id[12];
417 nd_byte unused[16];
418 };
419
420 struct oam_fm_ais_rdi_t {
421 nd_uint8_t failure_type;
422 nd_byte failure_location[16];
423 nd_byte unused[28];
424 };
425
426 void
oam_print(netdissect_options * ndo,const u_char * p,u_int length,u_int hec)427 oam_print(netdissect_options *ndo,
428 const u_char *p, u_int length, u_int hec)
429 {
430 uint32_t cell_header;
431 uint16_t vpi, vci, cksum, cksum_shouldbe, idx;
432 uint8_t cell_type, func_type, payload, clp;
433 const struct tok *oam_functype_str;
434
435 union {
436 const struct oam_fm_loopback_t *oam_fm_loopback;
437 const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi;
438 } oam_ptr;
439
440 ndo->ndo_protocol = "oam";
441 cell_header = GET_BE_U_4(p + hec);
442 cell_type = (GET_U_1((p + ATM_HDR_LEN_NOHEC + hec)) >> 4) & 0x0f;
443 func_type = GET_U_1((p + ATM_HDR_LEN_NOHEC + hec)) & 0x0f;
444
445 vpi = (cell_header>>20)&0xff;
446 vci = (cell_header>>4)&0xffff;
447 payload = (cell_header>>1)&0x7;
448 clp = cell_header&0x1;
449
450 ND_PRINT("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u",
451 tok2str(oam_f_values, "OAM F5", vci),
452 vpi, vci,
453 tok2str(atm_pty_values, "Unknown", payload),
454 clp, length);
455
456 if (!ndo->ndo_vflag) {
457 return;
458 }
459
460 ND_PRINT("\n\tcell-type %s (%u)",
461 tok2str(oam_celltype_values, "unknown", cell_type),
462 cell_type);
463
464 oam_functype_str = uint2tokary(oam_celltype2tokary, cell_type);
465 if (oam_functype_str == NULL)
466 ND_PRINT(", func-type unknown (%u)", func_type);
467 else
468 ND_PRINT(", func-type %s (%u)",
469 tok2str(oam_functype_str, "none", func_type),
470 func_type);
471
472 p += ATM_HDR_LEN_NOHEC + hec;
473
474 switch (cell_type << 4 | func_type) {
475 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK):
476 oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
477 ND_TCHECK_SIZE(oam_ptr.oam_fm_loopback);
478 ND_PRINT("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x",
479 tok2str(oam_fm_loopback_indicator_values,
480 "Unknown",
481 GET_U_1(oam_ptr.oam_fm_loopback->loopback_indicator) & OAM_FM_LOOPBACK_INDICATOR_MASK),
482 GET_BE_U_4(oam_ptr.oam_fm_loopback->correlation_tag));
483 ND_PRINT("\n\tLocation-ID ");
484 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) {
485 if (idx % 2) {
486 ND_PRINT("%04x ",
487 GET_BE_U_2(&oam_ptr.oam_fm_loopback->loopback_id[idx]));
488 }
489 }
490 ND_PRINT("\n\tSource-ID ");
491 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) {
492 if (idx % 2) {
493 ND_PRINT("%04x ",
494 GET_BE_U_2(&oam_ptr.oam_fm_loopback->source_id[idx]));
495 }
496 }
497 break;
498
499 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS):
500 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI):
501 oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN);
502 ND_TCHECK_SIZE(oam_ptr.oam_fm_ais_rdi);
503 ND_PRINT("\n\tFailure-type 0x%02x",
504 GET_U_1(oam_ptr.oam_fm_ais_rdi->failure_type));
505 ND_PRINT("\n\tLocation-ID ");
506 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) {
507 if (idx % 2) {
508 ND_PRINT("%04x ",
509 GET_BE_U_2(&oam_ptr.oam_fm_ais_rdi->failure_location[idx]));
510 }
511 }
512 break;
513
514 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK):
515 /* FIXME */
516 break;
517
518 default:
519 break;
520 }
521
522 /* crc10 checksum verification */
523 cksum = GET_BE_U_2(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN)
524 & OAM_CRC10_MASK;
525 cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN);
526
527 ND_PRINT("\n\tcksum 0x%03x (%scorrect)",
528 cksum,
529 cksum_shouldbe == 0 ? "" : "in");
530 }
531