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[tcpdump] / print-ppp.c
1 /*
2 * Copyright (c) 1990, 1991, 1993, 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 * Extensively modified by Motonori Shindo (mshindo@mshindo.net) for more
22 * complete PPP support.
23 */
24
25 /*
26 * TODO:
27 * o resolve XXX as much as possible
28 * o MP support
29 * o BAP support
30 */
31
32 #define NETDISSECT_REWORKED
33 #ifdef HAVE_CONFIG_H
34 #include "config.h"
35 #endif
36
37 #include <tcpdump-stdinc.h>
38
39 #ifdef __bsdi__
40 #include <net/slcompress.h>
41 #include <net/if_ppp.h>
42 #endif
43
44 #include <stdlib.h>
45
46 #include "interface.h"
47 #include "extract.h"
48 #include "addrtoname.h"
49 #include "ppp.h"
50 #include "chdlc.h"
51 #include "ethertype.h"
52 #include "oui.h"
53
54 /*
55 * The following constatns are defined by IANA. Please refer to
56 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
57 * for the up-to-date information.
58 */
59
60 /* Protocol Codes defined in ppp.h */
61
62 static const struct tok ppptype2str[] = {
63 { PPP_IP, "IP" },
64 { PPP_OSI, "OSI" },
65 { PPP_NS, "NS" },
66 { PPP_DECNET, "DECNET" },
67 { PPP_APPLE, "APPLE" },
68 { PPP_IPX, "IPX" },
69 { PPP_VJC, "VJC IP" },
70 { PPP_VJNC, "VJNC IP" },
71 { PPP_BRPDU, "BRPDU" },
72 { PPP_STII, "STII" },
73 { PPP_VINES, "VINES" },
74 { PPP_MPLS_UCAST, "MPLS" },
75 { PPP_MPLS_MCAST, "MPLS" },
76 { PPP_COMP, "Compressed"},
77 { PPP_ML, "MLPPP"},
78 { PPP_IPV6, "IP6"},
79
80 { PPP_HELLO, "HELLO" },
81 { PPP_LUXCOM, "LUXCOM" },
82 { PPP_SNS, "SNS" },
83 { PPP_IPCP, "IPCP" },
84 { PPP_OSICP, "OSICP" },
85 { PPP_NSCP, "NSCP" },
86 { PPP_DECNETCP, "DECNETCP" },
87 { PPP_APPLECP, "APPLECP" },
88 { PPP_IPXCP, "IPXCP" },
89 { PPP_STIICP, "STIICP" },
90 { PPP_VINESCP, "VINESCP" },
91 { PPP_IPV6CP, "IP6CP" },
92 { PPP_MPLSCP, "MPLSCP" },
93
94 { PPP_LCP, "LCP" },
95 { PPP_PAP, "PAP" },
96 { PPP_LQM, "LQM" },
97 { PPP_CHAP, "CHAP" },
98 { PPP_EAP, "EAP" },
99 { PPP_SPAP, "SPAP" },
100 { PPP_SPAP_OLD, "Old-SPAP" },
101 { PPP_BACP, "BACP" },
102 { PPP_BAP, "BAP" },
103 { PPP_MPCP, "MLPPP-CP" },
104 { PPP_CCP, "CCP" },
105 { 0, NULL }
106 };
107
108 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */
109
110 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */
111 #define CPCODES_CONF_REQ 1 /* Configure-Request */
112 #define CPCODES_CONF_ACK 2 /* Configure-Ack */
113 #define CPCODES_CONF_NAK 3 /* Configure-Nak */
114 #define CPCODES_CONF_REJ 4 /* Configure-Reject */
115 #define CPCODES_TERM_REQ 5 /* Terminate-Request */
116 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */
117 #define CPCODES_CODE_REJ 7 /* Code-Reject */
118 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */
119 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */
120 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */
121 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */
122 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */
123 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */
124 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */
125 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */
126
127 static const struct tok cpcodes[] = {
128 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */
129 {CPCODES_CONF_REQ, "Conf-Request"},
130 {CPCODES_CONF_ACK, "Conf-Ack"},
131 {CPCODES_CONF_NAK, "Conf-Nack"},
132 {CPCODES_CONF_REJ, "Conf-Reject"},
133 {CPCODES_TERM_REQ, "Term-Request"},
134 {CPCODES_TERM_ACK, "Term-Ack"},
135 {CPCODES_CODE_REJ, "Code-Reject"},
136 {CPCODES_PROT_REJ, "Prot-Reject"},
137 {CPCODES_ECHO_REQ, "Echo-Request"},
138 {CPCODES_ECHO_RPL, "Echo-Reply"},
139 {CPCODES_DISC_REQ, "Disc-Req"},
140 {CPCODES_ID, "Ident"}, /* RFC1570 */
141 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */
142 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */
143 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */
144 {0, NULL}
145 };
146
147 /* LCP Config Options */
148
149 #define LCPOPT_VEXT 0
150 #define LCPOPT_MRU 1
151 #define LCPOPT_ACCM 2
152 #define LCPOPT_AP 3
153 #define LCPOPT_QP 4
154 #define LCPOPT_MN 5
155 #define LCPOPT_DEP6 6
156 #define LCPOPT_PFC 7
157 #define LCPOPT_ACFC 8
158 #define LCPOPT_FCSALT 9
159 #define LCPOPT_SDP 10
160 #define LCPOPT_NUMMODE 11
161 #define LCPOPT_DEP12 12
162 #define LCPOPT_CBACK 13
163 #define LCPOPT_DEP14 14
164 #define LCPOPT_DEP15 15
165 #define LCPOPT_DEP16 16
166 #define LCPOPT_MLMRRU 17
167 #define LCPOPT_MLSSNHF 18
168 #define LCPOPT_MLED 19
169 #define LCPOPT_PROP 20
170 #define LCPOPT_DCEID 21
171 #define LCPOPT_MPP 22
172 #define LCPOPT_LD 23
173 #define LCPOPT_LCPAOPT 24
174 #define LCPOPT_COBS 25
175 #define LCPOPT_PE 26
176 #define LCPOPT_MLHF 27
177 #define LCPOPT_I18N 28
178 #define LCPOPT_SDLOS 29
179 #define LCPOPT_PPPMUX 30
180
181 #define LCPOPT_MIN LCPOPT_VEXT
182 #define LCPOPT_MAX LCPOPT_PPPMUX
183
184 static const char *lcpconfopts[] = {
185 "Vend-Ext", /* (0) */
186 "MRU", /* (1) */
187 "ACCM", /* (2) */
188 "Auth-Prot", /* (3) */
189 "Qual-Prot", /* (4) */
190 "Magic-Num", /* (5) */
191 "deprecated(6)", /* used to be a Quality Protocol */
192 "PFC", /* (7) */
193 "ACFC", /* (8) */
194 "FCS-Alt", /* (9) */
195 "SDP", /* (10) */
196 "Num-Mode", /* (11) */
197 "deprecated(12)", /* used to be a Multi-Link-Procedure*/
198 "Call-Back", /* (13) */
199 "deprecated(14)", /* used to be a Connect-Time */
200 "deprecated(15)", /* used to be a Compund-Frames */
201 "deprecated(16)", /* used to be a Nominal-Data-Encap */
202 "MRRU", /* (17) */
203 "12-Bit seq #", /* (18) */
204 "End-Disc", /* (19) */
205 "Proprietary", /* (20) */
206 "DCE-Id", /* (21) */
207 "MP+", /* (22) */
208 "Link-Disc", /* (23) */
209 "LCP-Auth-Opt", /* (24) */
210 "COBS", /* (25) */
211 "Prefix-elision", /* (26) */
212 "Multilink-header-Form",/* (27) */
213 "I18N", /* (28) */
214 "SDL-over-SONET/SDH", /* (29) */
215 "PPP-Muxing", /* (30) */
216 };
217
218 /* ECP - to be supported */
219
220 /* CCP Config Options */
221
222 #define CCPOPT_OUI 0 /* RFC1962 */
223 #define CCPOPT_PRED1 1 /* RFC1962 */
224 #define CCPOPT_PRED2 2 /* RFC1962 */
225 #define CCPOPT_PJUMP 3 /* RFC1962 */
226 /* 4-15 unassigned */
227 #define CCPOPT_HPPPC 16 /* RFC1962 */
228 #define CCPOPT_STACLZS 17 /* RFC1974 */
229 #define CCPOPT_MPPC 18 /* RFC2118 */
230 #define CCPOPT_GFZA 19 /* RFC1962 */
231 #define CCPOPT_V42BIS 20 /* RFC1962 */
232 #define CCPOPT_BSDCOMP 21 /* RFC1977 */
233 /* 22 unassigned */
234 #define CCPOPT_LZSDCP 23 /* RFC1967 */
235 #define CCPOPT_MVRCA 24 /* RFC1975 */
236 #define CCPOPT_DEC 25 /* RFC1976 */
237 #define CCPOPT_DEFLATE 26 /* RFC1979 */
238 /* 27-254 unassigned */
239 #define CCPOPT_RESV 255 /* RFC1962 */
240
241 static const struct tok ccpconfopts_values[] = {
242 { CCPOPT_OUI, "OUI" },
243 { CCPOPT_PRED1, "Pred-1" },
244 { CCPOPT_PRED2, "Pred-2" },
245 { CCPOPT_PJUMP, "Puddle" },
246 { CCPOPT_HPPPC, "HP-PPC" },
247 { CCPOPT_STACLZS, "Stac-LZS" },
248 { CCPOPT_MPPC, "MPPC" },
249 { CCPOPT_GFZA, "Gand-FZA" },
250 { CCPOPT_V42BIS, "V.42bis" },
251 { CCPOPT_BSDCOMP, "BSD-Comp" },
252 { CCPOPT_LZSDCP, "LZS-DCP" },
253 { CCPOPT_MVRCA, "MVRCA" },
254 { CCPOPT_DEC, "DEC" },
255 { CCPOPT_DEFLATE, "Deflate" },
256 { CCPOPT_RESV, "Reserved"},
257 {0, NULL}
258 };
259
260 /* BACP Config Options */
261
262 #define BACPOPT_FPEER 1 /* RFC2125 */
263
264 static const struct tok bacconfopts_values[] = {
265 { BACPOPT_FPEER, "Favored-Peer" },
266 {0, NULL}
267 };
268
269
270 /* SDCP - to be supported */
271
272 /* IPCP Config Options */
273 #define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */
274 #define IPCPOPT_IPCOMP 2 /* RFC1332 */
275 #define IPCPOPT_ADDR 3 /* RFC1332 */
276 #define IPCPOPT_MOBILE4 4 /* RFC2290 */
277 #define IPCPOPT_PRIDNS 129 /* RFC1877 */
278 #define IPCPOPT_PRINBNS 130 /* RFC1877 */
279 #define IPCPOPT_SECDNS 131 /* RFC1877 */
280 #define IPCPOPT_SECNBNS 132 /* RFC1877 */
281
282 static const struct tok ipcpopt_values[] = {
283 { IPCPOPT_2ADDR, "IP-Addrs" },
284 { IPCPOPT_IPCOMP, "IP-Comp" },
285 { IPCPOPT_ADDR, "IP-Addr" },
286 { IPCPOPT_MOBILE4, "Home-Addr" },
287 { IPCPOPT_PRIDNS, "Pri-DNS" },
288 { IPCPOPT_PRINBNS, "Pri-NBNS" },
289 { IPCPOPT_SECDNS, "Sec-DNS" },
290 { IPCPOPT_SECNBNS, "Sec-NBNS" },
291 { 0, NULL }
292 };
293
294 #define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */
295 #define IPCPOPT_IPCOMP_MINLEN 14
296
297 static const struct tok ipcpopt_compproto_values[] = {
298 { PPP_VJC, "VJ-Comp" },
299 { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" },
300 { 0, NULL }
301 };
302
303 static const struct tok ipcpopt_compproto_subopt_values[] = {
304 { 1, "RTP-Compression" },
305 { 2, "Enhanced RTP-Compression" },
306 { 0, NULL }
307 };
308
309 /* IP6CP Config Options */
310 #define IP6CP_IFID 1
311
312 static const struct tok ip6cpopt_values[] = {
313 { IP6CP_IFID, "Interface-ID" },
314 { 0, NULL }
315 };
316
317 /* ATCP - to be supported */
318 /* OSINLCP - to be supported */
319 /* BVCP - to be supported */
320 /* BCP - to be supported */
321 /* IPXCP - to be supported */
322 /* MPLSCP - to be supported */
323
324 /* Auth Algorithms */
325
326 /* 0-4 Reserved (RFC1994) */
327 #define AUTHALG_CHAPMD5 5 /* RFC1994 */
328 #define AUTHALG_MSCHAP1 128 /* RFC2433 */
329 #define AUTHALG_MSCHAP2 129 /* RFC2795 */
330
331 static const struct tok authalg_values[] = {
332 { AUTHALG_CHAPMD5, "MD5" },
333 { AUTHALG_MSCHAP1, "MS-CHAPv1" },
334 { AUTHALG_MSCHAP2, "MS-CHAPv2" },
335 { 0, NULL }
336 };
337
338 /* FCS Alternatives - to be supported */
339
340 /* Multilink Endpoint Discriminator (RFC1717) */
341 #define MEDCLASS_NULL 0 /* Null Class */
342 #define MEDCLASS_LOCAL 1 /* Locally Assigned */
343 #define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */
344 #define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */
345 #define MEDCLASS_MNB 4 /* PPP Magic Number Block */
346 #define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */
347
348 /* PPP LCP Callback */
349 #define CALLBACK_AUTH 0 /* Location determined by user auth */
350 #define CALLBACK_DSTR 1 /* Dialing string */
351 #define CALLBACK_LID 2 /* Location identifier */
352 #define CALLBACK_E164 3 /* E.164 number */
353 #define CALLBACK_X500 4 /* X.500 distinguished name */
354 #define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */
355
356 static const struct tok ppp_callback_values[] = {
357 { CALLBACK_AUTH, "UserAuth" },
358 { CALLBACK_DSTR, "DialString" },
359 { CALLBACK_LID, "LocalID" },
360 { CALLBACK_E164, "E.164" },
361 { CALLBACK_X500, "X.500" },
362 { CALLBACK_CBCP, "CBCP" },
363 { 0, NULL }
364 };
365
366 /* CHAP */
367
368 #define CHAP_CHAL 1
369 #define CHAP_RESP 2
370 #define CHAP_SUCC 3
371 #define CHAP_FAIL 4
372
373 static const struct tok chapcode_values[] = {
374 { CHAP_CHAL, "Challenge" },
375 { CHAP_RESP, "Response" },
376 { CHAP_SUCC, "Success" },
377 { CHAP_FAIL, "Fail" },
378 { 0, NULL}
379 };
380
381 /* PAP */
382
383 #define PAP_AREQ 1
384 #define PAP_AACK 2
385 #define PAP_ANAK 3
386
387 static const struct tok papcode_values[] = {
388 { PAP_AREQ, "Auth-Req" },
389 { PAP_AACK, "Auth-ACK" },
390 { PAP_ANAK, "Auth-NACK" },
391 { 0, NULL }
392 };
393
394 /* BAP */
395 #define BAP_CALLREQ 1
396 #define BAP_CALLRES 2
397 #define BAP_CBREQ 3
398 #define BAP_CBRES 4
399 #define BAP_LDQREQ 5
400 #define BAP_LDQRES 6
401 #define BAP_CSIND 7
402 #define BAP_CSRES 8
403
404 static int print_lcp_config_options(netdissect_options *, const u_char *p, int);
405 static int print_ipcp_config_options(netdissect_options *, const u_char *p, int);
406 static int print_ip6cp_config_options(netdissect_options *, const u_char *p, int);
407 static int print_ccp_config_options(netdissect_options *, const u_char *p, int);
408 static int print_bacp_config_options(netdissect_options *, const u_char *p, int);
409 static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, int length);
410
411 /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
412 static void
413 handle_ctrl_proto(netdissect_options *ndo,
414 u_int proto, const u_char *pptr, int length)
415 {
416 const char *typestr;
417 u_int code, len;
418 int (*pfunc)(netdissect_options *, const u_char *, int);
419 int x, j;
420 const u_char *tptr;
421
422 tptr=pptr;
423
424 typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto);
425 ND_PRINT((ndo, "%s, ", typestr));
426
427 if (length < 4) /* FIXME weak boundary checking */
428 goto trunc;
429 ND_TCHECK2(*tptr, 2);
430
431 code = *tptr++;
432
433 ND_PRINT((ndo, "%s (0x%02x), id %u, length %u",
434 tok2str(cpcodes, "Unknown Opcode",code),
435 code,
436 *tptr++, /* ID */
437 length + 2));
438
439 if (!ndo->ndo_vflag)
440 return;
441
442 if (length <= 4)
443 return; /* there may be a NULL confreq etc. */
444
445 ND_TCHECK2(*tptr, 2);
446 len = EXTRACT_16BITS(tptr);
447 tptr += 2;
448
449 ND_PRINT((ndo, "\n\tencoded length %u (=Option(s) length %u)", len, len - 4));
450
451 if (ndo->ndo_vflag > 1)
452 print_unknown_data(ndo, pptr - 2, "\n\t", 6);
453
454
455 switch (code) {
456 case CPCODES_VEXT:
457 if (length < 11)
458 break;
459 ND_TCHECK2(*tptr, 4);
460 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)));
461 tptr += 4;
462 ND_TCHECK2(*tptr, 3);
463 ND_PRINT((ndo, " Vendor: %s (%u)",
464 tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)),
465 EXTRACT_24BITS(tptr)));
466 /* XXX: need to decode Kind and Value(s)? */
467 break;
468 case CPCODES_CONF_REQ:
469 case CPCODES_CONF_ACK:
470 case CPCODES_CONF_NAK:
471 case CPCODES_CONF_REJ:
472 x = len - 4; /* Code(1), Identifier(1) and Length(2) */
473 do {
474 switch (proto) {
475 case PPP_LCP:
476 pfunc = print_lcp_config_options;
477 break;
478 case PPP_IPCP:
479 pfunc = print_ipcp_config_options;
480 break;
481 case PPP_IPV6CP:
482 pfunc = print_ip6cp_config_options;
483 break;
484 case PPP_CCP:
485 pfunc = print_ccp_config_options;
486 break;
487 case PPP_BACP:
488 pfunc = print_bacp_config_options;
489 break;
490 default:
491 /*
492 * No print routine for the options for
493 * this protocol.
494 */
495 pfunc = NULL;
496 break;
497 }
498
499 if (pfunc == NULL) /* catch the above null pointer if unknown CP */
500 break;
501
502 if ((j = (*pfunc)(ndo, tptr, len)) == 0)
503 break;
504 x -= j;
505 tptr += j;
506 } while (x > 0);
507 break;
508
509 case CPCODES_TERM_REQ:
510 case CPCODES_TERM_ACK:
511 /* XXX: need to decode Data? */
512 break;
513 case CPCODES_CODE_REJ:
514 /* XXX: need to decode Rejected-Packet? */
515 break;
516 case CPCODES_PROT_REJ:
517 if (length < 6)
518 break;
519 ND_TCHECK2(*tptr, 2);
520 ND_PRINT((ndo, "\n\t Rejected %s Protocol (0x%04x)",
521 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
522 EXTRACT_16BITS(tptr)));
523 /* XXX: need to decode Rejected-Information? - hexdump for now */
524 if (len > 6) {
525 ND_PRINT((ndo, "\n\t Rejected Packet"));
526 print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2);
527 }
528 break;
529 case CPCODES_ECHO_REQ:
530 case CPCODES_ECHO_RPL:
531 case CPCODES_DISC_REQ:
532 if (length < 8)
533 break;
534 ND_TCHECK2(*tptr, 4);
535 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)));
536 /* XXX: need to decode Data? - hexdump for now */
537 if (len > 8) {
538 ND_PRINT((ndo, "\n\t -----trailing data-----"));
539 ND_TCHECK2(tptr[4], len - 8);
540 print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8);
541 }
542 break;
543 case CPCODES_ID:
544 if (length < 8)
545 break;
546 ND_TCHECK2(*tptr, 4);
547 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)));
548 /* RFC 1661 says this is intended to be human readable */
549 if (len > 8) {
550 ND_PRINT((ndo, "\n\t Message\n\t "));
551 if (fn_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend))
552 goto trunc;
553 }
554 break;
555 case CPCODES_TIME_REM:
556 if (length < 12)
557 break;
558 ND_TCHECK2(*tptr, 4);
559 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)));
560 ND_TCHECK2(*(tptr + 4), 4);
561 ND_PRINT((ndo, ", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4)));
562 /* XXX: need to decode Message? */
563 break;
564 default:
565 /* XXX this is dirty but we do not get the
566 * original pointer passed to the begin
567 * the PPP packet */
568 if (ndo->ndo_vflag <= 1)
569 print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2);
570 break;
571 }
572 return;
573
574 trunc:
575 ND_PRINT((ndo, "[|%s]", typestr));
576 }
577
578 /* LCP config options */
579 static int
580 print_lcp_config_options(netdissect_options *ndo,
581 const u_char *p, int length)
582 {
583 int len, opt;
584
585 if (length < 2)
586 return 0;
587 ND_TCHECK2(*p, 2);
588 len = p[1];
589 opt = p[0];
590 if (length < len)
591 return 0;
592 if (len < 2) {
593 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
594 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
595 lcpconfopts[opt], opt, len));
596 else
597 ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt));
598 return 0;
599 }
600 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
601 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len));
602 else {
603 ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt));
604 return len;
605 }
606
607 switch (opt) {
608 case LCPOPT_VEXT:
609 if (len < 6) {
610 ND_PRINT((ndo, " (length bogus, should be >= 6)"));
611 return len;
612 }
613 ND_TCHECK2(*(p + 2), 3);
614 ND_PRINT((ndo, ": Vendor: %s (%u)",
615 tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)),
616 EXTRACT_24BITS(p + 2)));
617 #if 0
618 ND_TCHECK(p[5]);
619 ND_PRINT((ndo, ", kind: 0x%02x", p[5]));
620 ND_PRINT((ndo, ", Value: 0x"));
621 for (i = 0; i < len - 6; i++) {
622 ND_TCHECK(p[6 + i]);
623 ND_PRINT((ndo, "%02x", p[6 + i]));
624 }
625 #endif
626 break;
627 case LCPOPT_MRU:
628 if (len != 4) {
629 ND_PRINT((ndo, " (length bogus, should be = 4)"));
630 return len;
631 }
632 ND_TCHECK2(*(p + 2), 2);
633 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2)));
634 break;
635 case LCPOPT_ACCM:
636 if (len != 6) {
637 ND_PRINT((ndo, " (length bogus, should be = 6)"));
638 return len;
639 }
640 ND_TCHECK2(*(p + 2), 4);
641 ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2)));
642 break;
643 case LCPOPT_AP:
644 if (len < 4) {
645 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
646 return len;
647 }
648 ND_TCHECK2(*(p + 2), 2);
649 ND_PRINT((ndo, ": %s", tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", EXTRACT_16BITS(p + 2))));
650
651 switch (EXTRACT_16BITS(p+2)) {
652 case PPP_CHAP:
653 ND_TCHECK(p[4]);
654 ND_PRINT((ndo, ", %s", tok2str(authalg_values, "Unknown Auth Alg %u", p[4])));
655 break;
656 case PPP_PAP: /* fall through */
657 case PPP_EAP:
658 case PPP_SPAP:
659 case PPP_SPAP_OLD:
660 break;
661 default:
662 print_unknown_data(ndo, p, "\n\t", len);
663 }
664 break;
665 case LCPOPT_QP:
666 if (len < 4) {
667 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
668 return 0;
669 }
670 ND_TCHECK2(*(p + 2), 2);
671 if (EXTRACT_16BITS(p+2) == PPP_LQM)
672 ND_PRINT((ndo, ": LQR"));
673 else
674 ND_PRINT((ndo, ": unknown"));
675 break;
676 case LCPOPT_MN:
677 if (len != 6) {
678 ND_PRINT((ndo, " (length bogus, should be = 6)"));
679 return 0;
680 }
681 ND_TCHECK2(*(p + 2), 4);
682 ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2)));
683 break;
684 case LCPOPT_PFC:
685 break;
686 case LCPOPT_ACFC:
687 break;
688 case LCPOPT_LD:
689 if (len != 4) {
690 ND_PRINT((ndo, " (length bogus, should be = 4)"));
691 return 0;
692 }
693 ND_TCHECK2(*(p + 2), 2);
694 ND_PRINT((ndo, ": 0x%04x", EXTRACT_16BITS(p + 2)));
695 break;
696 case LCPOPT_CBACK:
697 if (len < 3) {
698 ND_PRINT((ndo, " (length bogus, should be >= 3)"));
699 return 0;
700 }
701 ND_PRINT((ndo, ": "));
702 ND_TCHECK(p[2]);
703 ND_PRINT((ndo, ": Callback Operation %s (%u)",
704 tok2str(ppp_callback_values, "Unknown", p[2]),
705 p[2]));
706 break;
707 case LCPOPT_MLMRRU:
708 if (len != 4) {
709 ND_PRINT((ndo, " (length bogus, should be = 4)"));
710 return 0;
711 }
712 ND_TCHECK2(*(p + 2), 2);
713 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2)));
714 break;
715 case LCPOPT_MLED:
716 if (len < 3) {
717 ND_PRINT((ndo, " (length bogus, should be >= 3)"));
718 return 0;
719 }
720 ND_TCHECK(p[2]);
721 switch (p[2]) { /* class */
722 case MEDCLASS_NULL:
723 ND_PRINT((ndo, ": Null"));
724 break;
725 case MEDCLASS_LOCAL:
726 ND_PRINT((ndo, ": Local")); /* XXX */
727 break;
728 case MEDCLASS_IPV4:
729 if (len != 7) {
730 ND_PRINT((ndo, " (length bogus, should be = 7)"));
731 return 0;
732 }
733 ND_TCHECK2(*(p + 3), 4);
734 ND_PRINT((ndo, ": IPv4 %s", ipaddr_string(ndo, p + 3)));
735 break;
736 case MEDCLASS_MAC:
737 if (len != 9) {
738 ND_PRINT((ndo, " (length bogus, should be = 9)"));
739 return 0;
740 }
741 ND_TCHECK(p[8]);
742 ND_PRINT((ndo, ": MAC %02x:%02x:%02x:%02x:%02x:%02x",
743 p[3], p[4], p[5], p[6], p[7], p[8]));
744 break;
745 case MEDCLASS_MNB:
746 ND_PRINT((ndo, ": Magic-Num-Block")); /* XXX */
747 break;
748 case MEDCLASS_PSNDN:
749 ND_PRINT((ndo, ": PSNDN")); /* XXX */
750 break;
751 default:
752 ND_PRINT((ndo, ": Unknown class %u", p[2]));
753 break;
754 }
755 break;
756
757 /* XXX: to be supported */
758 #if 0
759 case LCPOPT_DEP6:
760 case LCPOPT_FCSALT:
761 case LCPOPT_SDP:
762 case LCPOPT_NUMMODE:
763 case LCPOPT_DEP12:
764 case LCPOPT_DEP14:
765 case LCPOPT_DEP15:
766 case LCPOPT_DEP16:
767 case LCPOPT_MLSSNHF:
768 case LCPOPT_PROP:
769 case LCPOPT_DCEID:
770 case LCPOPT_MPP:
771 case LCPOPT_LCPAOPT:
772 case LCPOPT_COBS:
773 case LCPOPT_PE:
774 case LCPOPT_MLHF:
775 case LCPOPT_I18N:
776 case LCPOPT_SDLOS:
777 case LCPOPT_PPPMUX:
778 break;
779 #endif
780 default:
781 /*
782 * Unknown option; dump it as raw bytes now if we're
783 * not going to do so below.
784 */
785 if (ndo->ndo_vflag < 2)
786 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
787 break;
788 }
789
790 if (ndo->ndo_vflag > 1)
791 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
792
793 return len;
794
795 trunc:
796 ND_PRINT((ndo, "[|lcp]"));
797 return 0;
798 }
799
800 /* ML-PPP*/
801 static const struct tok ppp_ml_flag_values[] = {
802 { 0x80, "begin" },
803 { 0x40, "end" },
804 { 0, NULL }
805 };
806
807 static void
808 handle_mlppp(netdissect_options *ndo,
809 const u_char *p, int length) {
810
811 if (!ndo->ndo_eflag)
812 ND_PRINT((ndo, "MLPPP, "));
813
814 ND_PRINT((ndo, "seq 0x%03x, Flags [%s], length %u",
815 (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */
816 bittok2str(ppp_ml_flag_values, "none", *p & 0xc0),
817 length));
818 }
819
820 /* CHAP */
821 static void
822 handle_chap(netdissect_options *ndo,
823 const u_char *p, int length)
824 {
825 u_int code, len;
826 int val_size, name_size, msg_size;
827 const u_char *p0;
828 int i;
829
830 p0 = p;
831 if (length < 1) {
832 ND_PRINT((ndo, "[|chap]"));
833 return;
834 } else if (length < 4) {
835 ND_TCHECK(*p);
836 ND_PRINT((ndo, "[|chap 0x%02x]", *p));
837 return;
838 }
839
840 ND_TCHECK(*p);
841 code = *p;
842 ND_PRINT((ndo, "CHAP, %s (0x%02x)",
843 tok2str(chapcode_values,"unknown",code),
844 code));
845 p++;
846
847 ND_TCHECK(*p);
848 ND_PRINT((ndo, ", id %u", *p)); /* ID */
849 p++;
850
851 ND_TCHECK2(*p, 2);
852 len = EXTRACT_16BITS(p);
853 p += 2;
854
855 /*
856 * Note that this is a generic CHAP decoding routine. Since we
857 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
858 * MS-CHAPv2) is used at this point, we can't decode packet
859 * specifically to each algorithms. Instead, we simply decode
860 * the GCD (Gratest Common Denominator) for all algorithms.
861 */
862 switch (code) {
863 case CHAP_CHAL:
864 case CHAP_RESP:
865 if (length - (p - p0) < 1)
866 return;
867 ND_TCHECK(*p);
868 val_size = *p; /* value size */
869 p++;
870 if (length - (p - p0) < val_size)
871 return;
872 ND_PRINT((ndo, ", Value "));
873 for (i = 0; i < val_size; i++) {
874 ND_TCHECK(*p);
875 ND_PRINT((ndo, "%02x", *p++));
876 }
877 name_size = len - (p - p0);
878 ND_PRINT((ndo, ", Name "));
879 for (i = 0; i < name_size; i++) {
880 ND_TCHECK(*p);
881 safeputchar(ndo, *p++);
882 }
883 break;
884 case CHAP_SUCC:
885 case CHAP_FAIL:
886 msg_size = len - (p - p0);
887 ND_PRINT((ndo, ", Msg "));
888 for (i = 0; i< msg_size; i++) {
889 ND_TCHECK(*p);
890 safeputchar(ndo, *p++);
891 }
892 break;
893 }
894 return;
895
896 trunc:
897 ND_PRINT((ndo, "[|chap]"));
898 }
899
900 /* PAP (see RFC 1334) */
901 static void
902 handle_pap(netdissect_options *ndo,
903 const u_char *p, int length)
904 {
905 u_int code, len;
906 int peerid_len, passwd_len, msg_len;
907 const u_char *p0;
908 int i;
909
910 p0 = p;
911 if (length < 1) {
912 ND_PRINT((ndo, "[|pap]"));
913 return;
914 } else if (length < 4) {
915 ND_TCHECK(*p);
916 ND_PRINT((ndo, "[|pap 0x%02x]", *p));
917 return;
918 }
919
920 ND_TCHECK(*p);
921 code = *p;
922 ND_PRINT((ndo, "PAP, %s (0x%02x)",
923 tok2str(papcode_values, "unknown", code),
924 code));
925 p++;
926
927 ND_TCHECK(*p);
928 ND_PRINT((ndo, ", id %u", *p)); /* ID */
929 p++;
930
931 ND_TCHECK2(*p, 2);
932 len = EXTRACT_16BITS(p);
933 p += 2;
934
935 if ((int)len > length) {
936 ND_PRINT((ndo, ", length %u > packet size", len));
937 return;
938 }
939 length = len;
940 if (length < (p - p0)) {
941 ND_PRINT((ndo, ", length %u < PAP header length", length));
942 return;
943 }
944
945 switch (code) {
946 case PAP_AREQ:
947 if (length - (p - p0) < 1)
948 return;
949 ND_TCHECK(*p);
950 peerid_len = *p; /* Peer-ID Length */
951 p++;
952 if (length - (p - p0) < peerid_len)
953 return;
954 ND_PRINT((ndo, ", Peer "));
955 for (i = 0; i < peerid_len; i++) {
956 ND_TCHECK(*p);
957 safeputchar(ndo, *p++);
958 }
959
960 if (length - (p - p0) < 1)
961 return;
962 ND_TCHECK(*p);
963 passwd_len = *p; /* Password Length */
964 p++;
965 if (length - (p - p0) < passwd_len)
966 return;
967 ND_PRINT((ndo, ", Name "));
968 for (i = 0; i < passwd_len; i++) {
969 ND_TCHECK(*p);
970 safeputchar(ndo, *p++);
971 }
972 break;
973 case PAP_AACK:
974 case PAP_ANAK:
975 if (length - (p - p0) < 1)
976 return;
977 ND_TCHECK(*p);
978 msg_len = *p; /* Msg-Length */
979 p++;
980 if (length - (p - p0) < msg_len)
981 return;
982 ND_PRINT((ndo, ", Msg "));
983 for (i = 0; i< msg_len; i++) {
984 ND_TCHECK(*p);
985 safeputchar(ndo, *p++);
986 }
987 break;
988 }
989 return;
990
991 trunc:
992 ND_PRINT((ndo, "[|pap]"));
993 }
994
995 /* BAP */
996 static void
997 handle_bap(netdissect_options *ndo _U_,
998 const u_char *p _U_, int length _U_)
999 {
1000 /* XXX: to be supported!! */
1001 }
1002
1003
1004 /* IPCP config options */
1005 static int
1006 print_ipcp_config_options(netdissect_options *ndo,
1007 const u_char *p, int length)
1008 {
1009 int len, opt;
1010 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
1011
1012 if (length < 2)
1013 return 0;
1014 ND_TCHECK2(*p, 2);
1015 len = p[1];
1016 opt = p[0];
1017 if (length < len)
1018 return 0;
1019 if (len < 2) {
1020 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1021 tok2str(ipcpopt_values,"unknown",opt),
1022 opt,
1023 len));
1024 return 0;
1025 }
1026
1027 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u",
1028 tok2str(ipcpopt_values,"unknown",opt),
1029 opt,
1030 len));
1031
1032 switch (opt) {
1033 case IPCPOPT_2ADDR: /* deprecated */
1034 if (len != 10) {
1035 ND_PRINT((ndo, " (length bogus, should be = 10)"));
1036 return len;
1037 }
1038 ND_TCHECK2(*(p + 6), 4);
1039 ND_PRINT((ndo, ": src %s, dst %s",
1040 ipaddr_string(ndo, p + 2),
1041 ipaddr_string(ndo, p + 6)));
1042 break;
1043 case IPCPOPT_IPCOMP:
1044 if (len < 4) {
1045 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
1046 return 0;
1047 }
1048 ND_TCHECK2(*(p + 2), 2);
1049 compproto = EXTRACT_16BITS(p+2);
1050
1051 ND_PRINT((ndo, ": %s (0x%02x):",
1052 tok2str(ipcpopt_compproto_values, "Unknown", compproto),
1053 compproto));
1054
1055 switch (compproto) {
1056 case PPP_VJC:
1057 /* XXX: VJ-Comp parameters should be decoded */
1058 break;
1059 case IPCPOPT_IPCOMP_HDRCOMP:
1060 if (len < IPCPOPT_IPCOMP_MINLEN) {
1061 ND_PRINT((ndo, " (length bogus, should be >= %u)",
1062 IPCPOPT_IPCOMP_MINLEN));
1063 return 0;
1064 }
1065
1066 ND_TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN);
1067 ND_PRINT((ndo, "\n\t TCP Space %u, non-TCP Space %u" \
1068 ", maxPeriod %u, maxTime %u, maxHdr %u",
1069 EXTRACT_16BITS(p+4),
1070 EXTRACT_16BITS(p+6),
1071 EXTRACT_16BITS(p+8),
1072 EXTRACT_16BITS(p+10),
1073 EXTRACT_16BITS(p+12)));
1074
1075 /* suboptions present ? */
1076 if (len > IPCPOPT_IPCOMP_MINLEN) {
1077 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
1078 p += IPCPOPT_IPCOMP_MINLEN;
1079
1080 ND_PRINT((ndo, "\n\t Suboptions, length %u", ipcomp_subopttotallen));
1081
1082 while (ipcomp_subopttotallen >= 2) {
1083 ND_TCHECK2(*p, 2);
1084 ipcomp_subopt = *p;
1085 ipcomp_suboptlen = *(p+1);
1086
1087 /* sanity check */
1088 if (ipcomp_subopt == 0 ||
1089 ipcomp_suboptlen == 0 )
1090 break;
1091
1092 /* XXX: just display the suboptions for now */
1093 ND_PRINT((ndo, "\n\t\t%s Suboption #%u, length %u",
1094 tok2str(ipcpopt_compproto_subopt_values,
1095 "Unknown",
1096 ipcomp_subopt),
1097 ipcomp_subopt,
1098 ipcomp_suboptlen));
1099
1100 ipcomp_subopttotallen -= ipcomp_suboptlen;
1101 p += ipcomp_suboptlen;
1102 }
1103 }
1104 break;
1105 default:
1106 break;
1107 }
1108 break;
1109
1110 case IPCPOPT_ADDR: /* those options share the same format - fall through */
1111 case IPCPOPT_MOBILE4:
1112 case IPCPOPT_PRIDNS:
1113 case IPCPOPT_PRINBNS:
1114 case IPCPOPT_SECDNS:
1115 case IPCPOPT_SECNBNS:
1116 if (len != 6) {
1117 ND_PRINT((ndo, " (length bogus, should be = 6)"));
1118 return 0;
1119 }
1120 ND_TCHECK2(*(p + 2), 4);
1121 ND_PRINT((ndo, ": %s", ipaddr_string(ndo, p + 2)));
1122 break;
1123 default:
1124 /*
1125 * Unknown option; dump it as raw bytes now if we're
1126 * not going to do so below.
1127 */
1128 if (ndo->ndo_vflag < 2)
1129 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
1130 break;
1131 }
1132 if (ndo->ndo_vflag > 1)
1133 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
1134 return len;
1135
1136 trunc:
1137 ND_PRINT((ndo, "[|ipcp]"));
1138 return 0;
1139 }
1140
1141 /* IP6CP config options */
1142 static int
1143 print_ip6cp_config_options(netdissect_options *ndo,
1144 const u_char *p, int length)
1145 {
1146 int len, opt;
1147
1148 if (length < 2)
1149 return 0;
1150 ND_TCHECK2(*p, 2);
1151 len = p[1];
1152 opt = p[0];
1153 if (length < len)
1154 return 0;
1155 if (len < 2) {
1156 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1157 tok2str(ip6cpopt_values,"unknown",opt),
1158 opt,
1159 len));
1160 return 0;
1161 }
1162
1163 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u",
1164 tok2str(ip6cpopt_values,"unknown",opt),
1165 opt,
1166 len));
1167
1168 switch (opt) {
1169 case IP6CP_IFID:
1170 if (len != 10) {
1171 ND_PRINT((ndo, " (length bogus, should be = 10)"));
1172 return len;
1173 }
1174 ND_TCHECK2(*(p + 2), 8);
1175 ND_PRINT((ndo, ": %04x:%04x:%04x:%04x",
1176 EXTRACT_16BITS(p + 2),
1177 EXTRACT_16BITS(p + 4),
1178 EXTRACT_16BITS(p + 6),
1179 EXTRACT_16BITS(p + 8)));
1180 break;
1181 default:
1182 /*
1183 * Unknown option; dump it as raw bytes now if we're
1184 * not going to do so below.
1185 */
1186 if (ndo->ndo_vflag < 2)
1187 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
1188 break;
1189 }
1190 if (ndo->ndo_vflag > 1)
1191 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
1192
1193 return len;
1194
1195 trunc:
1196 ND_PRINT((ndo, "[|ip6cp]"));
1197 return 0;
1198 }
1199
1200
1201 /* CCP config options */
1202 static int
1203 print_ccp_config_options(netdissect_options *ndo,
1204 const u_char *p, int length)
1205 {
1206 int len, opt;
1207
1208 if (length < 2)
1209 return 0;
1210 ND_TCHECK2(*p, 2);
1211 len = p[1];
1212 opt = p[0];
1213 if (length < len)
1214 return 0;
1215 if (len < 2) {
1216 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1217 tok2str(ccpconfopts_values, "Unknown", opt),
1218 opt,
1219 len));
1220 return 0;
1221 }
1222
1223 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u",
1224 tok2str(ccpconfopts_values, "Unknown", opt),
1225 opt,
1226 len));
1227
1228 switch (opt) {
1229 case CCPOPT_BSDCOMP:
1230 if (len < 3) {
1231 ND_PRINT((ndo, " (length bogus, should be >= 3)"));
1232 return len;
1233 }
1234 ND_TCHECK2(*(p + 2), 1);
1235 ND_PRINT((ndo, ": Version: %u, Dictionary Bits: %u",
1236 p[2] >> 5, p[2] & 0x1f));
1237 break;
1238 case CCPOPT_MVRCA:
1239 if (len < 4) {
1240 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
1241 return len;
1242 }
1243 ND_TCHECK2(*(p + 2), 1);
1244 ND_PRINT((ndo, ": Features: %u, PxP: %s, History: %u, #CTX-ID: %u",
1245 (p[2] & 0xc0) >> 6,
1246 (p[2] & 0x20) ? "Enabled" : "Disabled",
1247 p[2] & 0x1f, p[3]));
1248 break;
1249 case CCPOPT_DEFLATE:
1250 if (len < 4) {
1251 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
1252 return len;
1253 }
1254 ND_TCHECK2(*(p + 2), 1);
1255 ND_PRINT((ndo, ": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u",
1256 (p[2] & 0xf0) >> 4,
1257 ((p[2] & 0x0f) == 8) ? "zlib" : "unkown",
1258 p[2] & 0x0f, (p[3] & 0xfc) >> 2, p[3] & 0x03));
1259 break;
1260
1261 /* XXX: to be supported */
1262 #if 0
1263 case CCPOPT_OUI:
1264 case CCPOPT_PRED1:
1265 case CCPOPT_PRED2:
1266 case CCPOPT_PJUMP:
1267 case CCPOPT_HPPPC:
1268 case CCPOPT_STACLZS:
1269 case CCPOPT_MPPC:
1270 case CCPOPT_GFZA:
1271 case CCPOPT_V42BIS:
1272 case CCPOPT_LZSDCP:
1273 case CCPOPT_DEC:
1274 case CCPOPT_RESV:
1275 break;
1276 #endif
1277 default:
1278 /*
1279 * Unknown option; dump it as raw bytes now if we're
1280 * not going to do so below.
1281 */
1282 if (ndo->ndo_vflag < 2)
1283 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
1284 break;
1285 }
1286 if (ndo->ndo_vflag > 1)
1287 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
1288
1289 return len;
1290
1291 trunc:
1292 ND_PRINT((ndo, "[|ccp]"));
1293 return 0;
1294 }
1295
1296 /* BACP config options */
1297 static int
1298 print_bacp_config_options(netdissect_options *ndo,
1299 const u_char *p, int length)
1300 {
1301 int len, opt;
1302
1303 if (length < 2)
1304 return 0;
1305 ND_TCHECK2(*p, 2);
1306 len = p[1];
1307 opt = p[0];
1308 if (length < len)
1309 return 0;
1310 if (len < 2) {
1311 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1312 tok2str(bacconfopts_values, "Unknown", opt),
1313 opt,
1314 len));
1315 return 0;
1316 }
1317
1318 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u",
1319 tok2str(bacconfopts_values, "Unknown", opt),
1320 opt,
1321 len));
1322
1323 switch (opt) {
1324 case BACPOPT_FPEER:
1325 if (len != 6) {
1326 ND_PRINT((ndo, " (length bogus, should be = 6)"));
1327 return len;
1328 }
1329 ND_TCHECK2(*(p + 2), 4);
1330 ND_PRINT((ndo, ": Magic-Num 0x%08x", EXTRACT_32BITS(p + 2)));
1331 break;
1332 default:
1333 /*
1334 * Unknown option; dump it as raw bytes now if we're
1335 * not going to do so below.
1336 */
1337 if (ndo->ndo_vflag < 2)
1338 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
1339 break;
1340 }
1341 if (ndo->ndo_vflag > 1)
1342 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
1343
1344 return len;
1345
1346 trunc:
1347 ND_PRINT((ndo, "[|bacp]"));
1348 return 0;
1349 }
1350
1351 static void
1352 ppp_hdlc(netdissect_options *ndo,
1353 const u_char *p, int length)
1354 {
1355 u_char *b, *s, *t, c;
1356 int i, proto;
1357 const void *se;
1358
1359 if (length <= 0)
1360 return;
1361
1362 b = (u_int8_t *)malloc(length);
1363 if (b == NULL)
1364 return;
1365
1366 /*
1367 * Unescape all the data into a temporary, private, buffer.
1368 * Do this so that we dont overwrite the original packet
1369 * contents.
1370 */
1371 for (s = (u_char *)p, t = b, i = length; i > 0; i--) {
1372 c = *s++;
1373 if (c == 0x7d) {
1374 if (i > 1) {
1375 i--;
1376 c = *s++ ^ 0x20;
1377 } else
1378 continue;
1379 }
1380 *t++ = c;
1381 }
1382
1383 se = ndo->ndo_snapend;
1384 ndo->ndo_snapend = t;
1385 length = t - b;
1386
1387 /* now lets guess about the payload codepoint format */
1388 if (length < 1)
1389 goto trunc;
1390 proto = *b; /* start with a one-octet codepoint guess */
1391
1392 switch (proto) {
1393 case PPP_IP:
1394 ip_print(ndo, b + 1, length - 1);
1395 goto cleanup;
1396 #ifdef INET6
1397 case PPP_IPV6:
1398 ip6_print(ndo, b + 1, length - 1);
1399 goto cleanup;
1400 #endif
1401 default: /* no luck - try next guess */
1402 break;
1403 }
1404
1405 if (length < 2)
1406 goto trunc;
1407 proto = EXTRACT_16BITS(b); /* next guess - load two octets */
1408
1409 switch (proto) {
1410 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */
1411 if (length < 4)
1412 goto trunc;
1413 proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */
1414 handle_ppp(ndo, proto, b + 4, length - 4);
1415 break;
1416 default: /* last guess - proto must be a PPP proto-id */
1417 handle_ppp(ndo, proto, b + 2, length - 2);
1418 break;
1419 }
1420
1421 cleanup:
1422 ndo->ndo_snapend = se;
1423 free(b);
1424 return;
1425
1426 trunc:
1427 ndo->ndo_snapend = se;
1428 free(b);
1429 ND_PRINT((ndo, "[|ppp]"));
1430 }
1431
1432
1433 /* PPP */
1434 static void
1435 handle_ppp(netdissect_options *ndo,
1436 u_int proto, const u_char *p, int length)
1437 {
1438 if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */
1439 ppp_hdlc(ndo, p - 1, length);
1440 return;
1441 }
1442
1443 switch (proto) {
1444 case PPP_LCP: /* fall through */
1445 case PPP_IPCP:
1446 case PPP_OSICP:
1447 case PPP_MPLSCP:
1448 case PPP_IPV6CP:
1449 case PPP_CCP:
1450 case PPP_BACP:
1451 handle_ctrl_proto(ndo, proto, p, length);
1452 break;
1453 case PPP_ML:
1454 handle_mlppp(ndo, p, length);
1455 break;
1456 case PPP_CHAP:
1457 handle_chap(ndo, p, length);
1458 break;
1459 case PPP_PAP:
1460 handle_pap(ndo, p, length);
1461 break;
1462 case PPP_BAP: /* XXX: not yet completed */
1463 handle_bap(ndo, p, length);
1464 break;
1465 case ETHERTYPE_IP: /*XXX*/
1466 case PPP_VJNC:
1467 case PPP_IP:
1468 ip_print(ndo, p, length);
1469 break;
1470 #ifdef INET6
1471 case ETHERTYPE_IPV6: /*XXX*/
1472 case PPP_IPV6:
1473 ip6_print(ndo, p, length);
1474 break;
1475 #endif
1476 case ETHERTYPE_IPX: /*XXX*/
1477 case PPP_IPX:
1478 ipx_print(ndo, p, length);
1479 break;
1480 case PPP_OSI:
1481 isoclns_print(ndo, p, length, length);
1482 break;
1483 case PPP_MPLS_UCAST:
1484 case PPP_MPLS_MCAST:
1485 mpls_print(ndo, p, length);
1486 break;
1487 case PPP_COMP:
1488 ND_PRINT((ndo, "compressed PPP data"));
1489 break;
1490 default:
1491 ND_PRINT((ndo, "%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)));
1492 print_unknown_data(ndo, p, "\n\t", length);
1493 break;
1494 }
1495 }
1496
1497 /* Standard PPP printer */
1498 u_int
1499 ppp_print(netdissect_options *ndo,
1500 register const u_char *p, u_int length)
1501 {
1502 u_int proto,ppp_header;
1503 u_int olen = length; /* _o_riginal length */
1504 u_int hdr_len = 0;
1505
1506 /*
1507 * Here, we assume that p points to the Address and Control
1508 * field (if they present).
1509 */
1510 if (length < 2)
1511 goto trunc;
1512 ND_TCHECK2(*p, 2);
1513 ppp_header = EXTRACT_16BITS(p);
1514
1515 switch(ppp_header) {
1516 case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL):
1517 if (ndo->ndo_eflag) ND_PRINT((ndo, "In "));
1518 p += 2;
1519 length -= 2;
1520 hdr_len += 2;
1521 break;
1522 case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL):
1523 if (ndo->ndo_eflag) ND_PRINT((ndo, "Out "));
1524 p += 2;
1525 length -= 2;
1526 hdr_len += 2;
1527 break;
1528 case (PPP_ADDRESS << 8 | PPP_CONTROL):
1529 p += 2; /* ACFC not used */
1530 length -= 2;
1531 hdr_len += 2;
1532 break;
1533
1534 default:
1535 break;
1536 }
1537
1538 if (length < 2)
1539 goto trunc;
1540 ND_TCHECK(*p);
1541 if (*p % 2) {
1542 proto = *p; /* PFC is used */
1543 p++;
1544 length--;
1545 hdr_len++;
1546 } else {
1547 ND_TCHECK2(*p, 2);
1548 proto = EXTRACT_16BITS(p);
1549 p += 2;
1550 length -= 2;
1551 hdr_len += 2;
1552 }
1553
1554 if (ndo->ndo_eflag)
1555 ND_PRINT((ndo, "%s (0x%04x), length %u: ",
1556 tok2str(ppptype2str, "unknown", proto),
1557 proto,
1558 olen));
1559
1560 handle_ppp(ndo, proto, p, length);
1561 return (hdr_len);
1562 trunc:
1563 ND_PRINT((ndo, "[|ppp]"));
1564 return (0);
1565 }
1566
1567
1568 /* PPP I/F printer */
1569 u_int
1570 ppp_if_print(netdissect_options *ndo,
1571 const struct pcap_pkthdr *h, register const u_char *p)
1572 {
1573 register u_int length = h->len;
1574 register u_int caplen = h->caplen;
1575
1576 if (caplen < PPP_HDRLEN) {
1577 ND_PRINT((ndo, "[|ppp]"));
1578 return (caplen);
1579 }
1580
1581 #if 0
1582 /*
1583 * XXX: seems to assume that there are 2 octets prepended to an
1584 * actual PPP frame. The 1st octet looks like Input/Output flag
1585 * while 2nd octet is unknown, at least to me
1586 * (mshindo@mshindo.net).
1587 *
1588 * That was what the original tcpdump code did.
1589 *
1590 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1591 * packets and 0 for inbound packets - but only if the
1592 * protocol field has the 0x8000 bit set (i.e., it's a network
1593 * control protocol); it does so before running the packet through
1594 * "bpf_filter" to see if it should be discarded, and to see
1595 * if we should update the time we sent the most recent packet...
1596 *
1597 * ...but it puts the original address field back after doing
1598 * so.
1599 *
1600 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1601 *
1602 * I don't know if any PPP implementation handed up to a BPF
1603 * device packets with the first octet being 1 for outbound and
1604 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1605 * whether that ever needs to be checked or not.
1606 *
1607 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1608 * and its tcpdump appears to assume that the frame always
1609 * begins with an address field and a control field, and that
1610 * the address field might be 0x0f or 0x8f, for Cisco
1611 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1612 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1613 * RFC 1662.
1614 *
1615 * (Is the Cisco framing in question what DLT_C_HDLC, in
1616 * BSD/OS, is?)
1617 */
1618 if (ndo->ndo_eflag)
1619 ND_PRINT((ndo, "%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]));
1620 #endif
1621
1622 ppp_print(ndo, p, length);
1623
1624 return (0);
1625 }
1626
1627 /*
1628 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1629 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1630 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1631 * discard them *if* those are the first two octets, and parse the remaining
1632 * packet as a PPP packet, as "ppp_print()" does).
1633 *
1634 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1635 */
1636 u_int
1637 ppp_hdlc_if_print(netdissect_options *ndo,
1638 const struct pcap_pkthdr *h, register const u_char *p)
1639 {
1640 register u_int length = h->len;
1641 register u_int caplen = h->caplen;
1642 u_int proto;
1643 u_int hdrlen = 0;
1644
1645 if (caplen < 2) {
1646 ND_PRINT((ndo, "[|ppp]"));
1647 return (caplen);
1648 }
1649
1650 switch (p[0]) {
1651
1652 case PPP_ADDRESS:
1653 if (caplen < 4) {
1654 ND_PRINT((ndo, "[|ppp]"));
1655 return (caplen);
1656 }
1657
1658 if (ndo->ndo_eflag)
1659 ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length));
1660 p += 2;
1661 length -= 2;
1662 hdrlen += 2;
1663
1664 proto = EXTRACT_16BITS(p);
1665 p += 2;
1666 length -= 2;
1667 hdrlen += 2;
1668 ND_PRINT((ndo, "%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)));
1669
1670 handle_ppp(ndo, proto, p, length);
1671 break;
1672
1673 case CHDLC_UNICAST:
1674 case CHDLC_BCAST:
1675 return (chdlc_if_print(ndo, h, p));
1676
1677 default:
1678 if (ndo->ndo_eflag)
1679 ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length));
1680 p += 2;
1681 hdrlen += 2;
1682
1683 /*
1684 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1685 * the next two octets as an Ethernet type; does that
1686 * ever happen?
1687 */
1688 ND_PRINT((ndo, "unknown addr %02x; ctrl %02x", p[0], p[1]));
1689 break;
1690 }
1691
1692 return (hdrlen);
1693 }
1694
1695 #define PPP_BSDI_HDRLEN 24
1696
1697 /* BSD/OS specific PPP printer */
1698 u_int
1699 ppp_bsdos_if_print(netdissect_options *ndo _U_,
1700 const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1701 {
1702 register int hdrlength;
1703 #ifdef __bsdi__
1704 register u_int length = h->len;
1705 register u_int caplen = h->caplen;
1706 u_int16_t ptype;
1707 const u_char *q;
1708 int i;
1709
1710 if (caplen < PPP_BSDI_HDRLEN) {
1711 ND_PRINT((ndo, "[|ppp]"));
1712 return (caplen)
1713 }
1714
1715 hdrlength = 0;
1716
1717 #if 0
1718 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1719 if (ndo->ndo_eflag)
1720 ND_PRINT((ndo, "%02x %02x ", p[0], p[1]));
1721 p += 2;
1722 hdrlength = 2;
1723 }
1724
1725 if (ndo->ndo_eflag)
1726 ND_PRINT((ndo, "%d ", length));
1727 /* Retrieve the protocol type */
1728 if (*p & 01) {
1729 /* Compressed protocol field */
1730 ptype = *p;
1731 if (ndo->ndo_eflag)
1732 ND_PRINT((ndo, "%02x ", ptype));
1733 p++;
1734 hdrlength += 1;
1735 } else {
1736 /* Un-compressed protocol field */
1737 ptype = EXTRACT_16BITS(p);
1738 if (ndo->ndo_eflag)
1739 ND_PRINT((ndo, "%04x ", ptype));
1740 p += 2;
1741 hdrlength += 2;
1742 }
1743 #else
1744 ptype = 0; /*XXX*/
1745 if (ndo->ndo_eflag)
1746 ND_PRINT((ndo, "%c ", p[SLC_DIR] ? 'O' : 'I'));
1747 if (p[SLC_LLHL]) {
1748 /* link level header */
1749 struct ppp_header *ph;
1750
1751 q = p + SLC_BPFHDRLEN;
1752 ph = (struct ppp_header *)q;
1753 if (ph->phdr_addr == PPP_ADDRESS
1754 && ph->phdr_ctl == PPP_CONTROL) {
1755 if (ndo->ndo_eflag)
1756 ND_PRINT((ndo, "%02x %02x ", q[0], q[1]));
1757 ptype = EXTRACT_16BITS(&ph->phdr_type);
1758 if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1759 ND_PRINT((ndo, "%s ", tok2str(ppptype2str,
1760 "proto-#%d", ptype)));
1761 }
1762 } else {
1763 if (ndo->ndo_eflag) {
1764 ND_PRINT((ndo, "LLH=["));
1765 for (i = 0; i < p[SLC_LLHL]; i++)
1766 ND_PRINT((ndo, "%02x", q[i]));
1767 ND_PRINT((ndo, "] "));
1768 }
1769 }
1770 }
1771 if (ndo->ndo_eflag)
1772 ND_PRINT((ndo, "%d ", length));
1773 if (p[SLC_CHL]) {
1774 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1775
1776 switch (ptype) {
1777 case PPP_VJC:
1778 ptype = vjc_print(ndo, q, ptype);
1779 hdrlength = PPP_BSDI_HDRLEN;
1780 p += hdrlength;
1781 switch (ptype) {
1782 case PPP_IP:
1783 ip_print(ndo, p, length);
1784 break;
1785 #ifdef INET6
1786 case PPP_IPV6:
1787 ip6_print(ndo, p, length);
1788 break;
1789 #endif
1790 case PPP_MPLS_UCAST:
1791 case PPP_MPLS_MCAST:
1792 mpls_print(ndo, p, length);
1793 break;
1794 }
1795 goto printx;
1796 case PPP_VJNC:
1797 ptype = vjc_print(ndo, q, ptype);
1798 hdrlength = PPP_BSDI_HDRLEN;
1799 p += hdrlength;
1800 switch (ptype) {
1801 case PPP_IP:
1802 ip_print(ndo, p, length);
1803 break;
1804 #ifdef INET6
1805 case PPP_IPV6:
1806 ip6_print(ndo, p, length);
1807 break;
1808 #endif
1809 case PPP_MPLS_UCAST:
1810 case PPP_MPLS_MCAST:
1811 mpls_print(ndo, p, length);
1812 break;
1813 }
1814 goto printx;
1815 default:
1816 if (ndo->ndo_eflag) {
1817 ND_PRINT((ndo, "CH=["));
1818 for (i = 0; i < p[SLC_LLHL]; i++)
1819 ND_PRINT((ndo, "%02x", q[i]));
1820 ND_PRINT((ndo, "] "));
1821 }
1822 break;
1823 }
1824 }
1825
1826 hdrlength = PPP_BSDI_HDRLEN;
1827 #endif
1828
1829 length -= hdrlength;
1830 p += hdrlength;
1831
1832 switch (ptype) {
1833 case PPP_IP:
1834 ip_print(p, length);
1835 break;
1836 #ifdef INET6
1837 case PPP_IPV6:
1838 ip6_print(ndo, p, length);
1839 break;
1840 #endif
1841 case PPP_MPLS_UCAST:
1842 case PPP_MPLS_MCAST:
1843 mpls_print(ndo, p, length);
1844 break;
1845 default:
1846 ND_PRINT((ndo, "%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype)));
1847 }
1848
1849 printx:
1850 #else /* __bsdi */
1851 hdrlength = 0;
1852 #endif /* __bsdi__ */
1853 return (hdrlength);
1854 }
1855
1856
1857 /*
1858 * Local Variables:
1859 * c-style: whitesmith
1860 * c-basic-offset: 8
1861 * End:
1862 */
[mirror] the TCPdump network dissector