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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 /* \summary: Point to Point Protocol (PPP) printer */
26
27 /*
28 * TODO:
29 * o resolve XXX as much as possible
30 * o MP support
31 * o BAP support
32 */
33
34 #ifdef HAVE_CONFIG_H
35 #include <config.h>
36 #endif
37
38 #include "netdissect-stdinc.h"
39
40 #ifdef __bsdi__
41 #include <net/slcompress.h>
42 #include <net/if_ppp.h>
43 #endif
44
45 #include <stdlib.h>
46
47 #include "netdissect.h"
48 #include "extract.h"
49 #include "addrtoname.h"
50 #include "ppp.h"
51 #include "chdlc.h"
52 #include "ethertype.h"
53 #include "oui.h"
54 #include "netdissect-alloc.h"
55
56 /*
57 * The following constants are defined by IANA. Please refer to
58 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
59 * for the up-to-date information.
60 */
61
62 /* Protocol Codes defined in ppp.h */
63
64 static const struct tok ppptype2str[] = {
65 { PPP_IP, "IP" },
66 { PPP_OSI, "OSI" },
67 { PPP_NS, "NS" },
68 { PPP_DECNET, "DECNET" },
69 { PPP_APPLE, "APPLE" },
70 { PPP_IPX, "IPX" },
71 { PPP_VJC, "VJC IP" },
72 { PPP_VJNC, "VJNC IP" },
73 { PPP_BRPDU, "BRPDU" },
74 { PPP_STII, "STII" },
75 { PPP_VINES, "VINES" },
76 { PPP_MPLS_UCAST, "MPLS" },
77 { PPP_MPLS_MCAST, "MPLS" },
78 { PPP_COMP, "Compressed"},
79 { PPP_ML, "MLPPP"},
80 { PPP_IPV6, "IP6"},
81
82 { PPP_HELLO, "HELLO" },
83 { PPP_LUXCOM, "LUXCOM" },
84 { PPP_SNS, "SNS" },
85 { PPP_IPCP, "IPCP" },
86 { PPP_OSICP, "OSICP" },
87 { PPP_NSCP, "NSCP" },
88 { PPP_DECNETCP, "DECNETCP" },
89 { PPP_APPLECP, "APPLECP" },
90 { PPP_IPXCP, "IPXCP" },
91 { PPP_STIICP, "STIICP" },
92 { PPP_VINESCP, "VINESCP" },
93 { PPP_IPV6CP, "IP6CP" },
94 { PPP_MPLSCP, "MPLSCP" },
95
96 { PPP_LCP, "LCP" },
97 { PPP_PAP, "PAP" },
98 { PPP_LQM, "LQM" },
99 { PPP_CHAP, "CHAP" },
100 { PPP_EAP, "EAP" },
101 { PPP_SPAP, "SPAP" },
102 { PPP_SPAP_OLD, "Old-SPAP" },
103 { PPP_BACP, "BACP" },
104 { PPP_BAP, "BAP" },
105 { PPP_MPCP, "MLPPP-CP" },
106 { PPP_CCP, "CCP" },
107 { 0, NULL }
108 };
109
110 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */
111
112 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */
113 #define CPCODES_CONF_REQ 1 /* Configure-Request */
114 #define CPCODES_CONF_ACK 2 /* Configure-Ack */
115 #define CPCODES_CONF_NAK 3 /* Configure-Nak */
116 #define CPCODES_CONF_REJ 4 /* Configure-Reject */
117 #define CPCODES_TERM_REQ 5 /* Terminate-Request */
118 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */
119 #define CPCODES_CODE_REJ 7 /* Code-Reject */
120 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */
121 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */
122 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */
123 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */
124 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */
125 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */
126 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */
127 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */
128
129 static const struct tok cpcodes[] = {
130 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */
131 {CPCODES_CONF_REQ, "Conf-Request"},
132 {CPCODES_CONF_ACK, "Conf-Ack"},
133 {CPCODES_CONF_NAK, "Conf-Nack"},
134 {CPCODES_CONF_REJ, "Conf-Reject"},
135 {CPCODES_TERM_REQ, "Term-Request"},
136 {CPCODES_TERM_ACK, "Term-Ack"},
137 {CPCODES_CODE_REJ, "Code-Reject"},
138 {CPCODES_PROT_REJ, "Prot-Reject"},
139 {CPCODES_ECHO_REQ, "Echo-Request"},
140 {CPCODES_ECHO_RPL, "Echo-Reply"},
141 {CPCODES_DISC_REQ, "Disc-Req"},
142 {CPCODES_ID, "Ident"}, /* RFC1570 */
143 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */
144 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */
145 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */
146 {0, NULL}
147 };
148
149 /* LCP Config Options */
150
151 #define LCPOPT_VEXT 0
152 #define LCPOPT_MRU 1
153 #define LCPOPT_ACCM 2
154 #define LCPOPT_AP 3
155 #define LCPOPT_QP 4
156 #define LCPOPT_MN 5
157 #define LCPOPT_DEP6 6
158 #define LCPOPT_PFC 7
159 #define LCPOPT_ACFC 8
160 #define LCPOPT_FCSALT 9
161 #define LCPOPT_SDP 10
162 #define LCPOPT_NUMMODE 11
163 #define LCPOPT_DEP12 12
164 #define LCPOPT_CBACK 13
165 #define LCPOPT_DEP14 14
166 #define LCPOPT_DEP15 15
167 #define LCPOPT_DEP16 16
168 #define LCPOPT_MLMRRU 17
169 #define LCPOPT_MLSSNHF 18
170 #define LCPOPT_MLED 19
171 #define LCPOPT_PROP 20
172 #define LCPOPT_DCEID 21
173 #define LCPOPT_MPP 22
174 #define LCPOPT_LD 23
175 #define LCPOPT_LCPAOPT 24
176 #define LCPOPT_COBS 25
177 #define LCPOPT_PE 26
178 #define LCPOPT_MLHF 27
179 #define LCPOPT_I18N 28
180 #define LCPOPT_SDLOS 29
181 #define LCPOPT_PPPMUX 30
182
183 static const char *lcpconfopts[] = {
184 "Vend-Ext", /* (0) */
185 "MRU", /* (1) */
186 "ACCM", /* (2) */
187 "Auth-Prot", /* (3) */
188 "Qual-Prot", /* (4) */
189 "Magic-Num", /* (5) */
190 "deprecated(6)", /* used to be a Quality Protocol */
191 "PFC", /* (7) */
192 "ACFC", /* (8) */
193 "FCS-Alt", /* (9) */
194 "SDP", /* (10) */
195 "Num-Mode", /* (11) */
196 "deprecated(12)", /* used to be a Multi-Link-Procedure*/
197 "Call-Back", /* (13) */
198 "deprecated(14)", /* used to be a Connect-Time */
199 "deprecated(15)", /* used to be a Compund-Frames */
200 "deprecated(16)", /* used to be a Nominal-Data-Encap */
201 "MRRU", /* (17) */
202 "12-Bit seq #", /* (18) */
203 "End-Disc", /* (19) */
204 "Proprietary", /* (20) */
205 "DCE-Id", /* (21) */
206 "MP+", /* (22) */
207 "Link-Disc", /* (23) */
208 "LCP-Auth-Opt", /* (24) */
209 "COBS", /* (25) */
210 "Prefix-elision", /* (26) */
211 "Multilink-header-Form",/* (27) */
212 "I18N", /* (28) */
213 "SDL-over-SONET/SDH", /* (29) */
214 "PPP-Muxing", /* (30) */
215 };
216
217 #define NUM_LCPOPTS (sizeof(lcpconfopts) / sizeof(lcpconfopts[0]))
218
219 /* ECP - to be supported */
220
221 /* CCP Config Options */
222
223 #define CCPOPT_OUI 0 /* RFC1962 */
224 #define CCPOPT_PRED1 1 /* RFC1962 */
225 #define CCPOPT_PRED2 2 /* RFC1962 */
226 #define CCPOPT_PJUMP 3 /* RFC1962 */
227 /* 4-15 unassigned */
228 #define CCPOPT_HPPPC 16 /* RFC1962 */
229 #define CCPOPT_STACLZS 17 /* RFC1974 */
230 #define CCPOPT_MPPC 18 /* RFC2118 */
231 #define CCPOPT_GFZA 19 /* RFC1962 */
232 #define CCPOPT_V42BIS 20 /* RFC1962 */
233 #define CCPOPT_BSDCOMP 21 /* RFC1977 */
234 /* 22 unassigned */
235 #define CCPOPT_LZSDCP 23 /* RFC1967 */
236 #define CCPOPT_MVRCA 24 /* RFC1975 */
237 #define CCPOPT_DEC 25 /* RFC1976 */
238 #define CCPOPT_DEFLATE 26 /* RFC1979 */
239 /* 27-254 unassigned */
240 #define CCPOPT_RESV 255 /* RFC1962 */
241
242 static const struct tok ccpconfopts_values[] = {
243 { CCPOPT_OUI, "OUI" },
244 { CCPOPT_PRED1, "Pred-1" },
245 { CCPOPT_PRED2, "Pred-2" },
246 { CCPOPT_PJUMP, "Puddle" },
247 { CCPOPT_HPPPC, "HP-PPC" },
248 { CCPOPT_STACLZS, "Stac-LZS" },
249 { CCPOPT_MPPC, "MPPC" },
250 { CCPOPT_GFZA, "Gand-FZA" },
251 { CCPOPT_V42BIS, "V.42bis" },
252 { CCPOPT_BSDCOMP, "BSD-Comp" },
253 { CCPOPT_LZSDCP, "LZS-DCP" },
254 { CCPOPT_MVRCA, "MVRCA" },
255 { CCPOPT_DEC, "DEC" },
256 { CCPOPT_DEFLATE, "Deflate" },
257 { CCPOPT_RESV, "Reserved"},
258 {0, NULL}
259 };
260
261 /* BACP Config Options */
262
263 #define BACPOPT_FPEER 1 /* RFC2125 */
264
265 static const struct tok bacconfopts_values[] = {
266 { BACPOPT_FPEER, "Favored-Peer" },
267 {0, NULL}
268 };
269
270
271 /* SDCP - to be supported */
272
273 /* IPCP Config Options */
274 #define IPCPOPT_2ADDR 1 /* RFC1172, RFC1332 (deprecated) */
275 #define IPCPOPT_IPCOMP 2 /* RFC1332 */
276 #define IPCPOPT_ADDR 3 /* RFC1332 */
277 #define IPCPOPT_MOBILE4 4 /* RFC2290 */
278 #define IPCPOPT_PRIDNS 129 /* RFC1877 */
279 #define IPCPOPT_PRINBNS 130 /* RFC1877 */
280 #define IPCPOPT_SECDNS 131 /* RFC1877 */
281 #define IPCPOPT_SECNBNS 132 /* RFC1877 */
282
283 static const struct tok ipcpopt_values[] = {
284 { IPCPOPT_2ADDR, "IP-Addrs" },
285 { IPCPOPT_IPCOMP, "IP-Comp" },
286 { IPCPOPT_ADDR, "IP-Addr" },
287 { IPCPOPT_MOBILE4, "Home-Addr" },
288 { IPCPOPT_PRIDNS, "Pri-DNS" },
289 { IPCPOPT_PRINBNS, "Pri-NBNS" },
290 { IPCPOPT_SECDNS, "Sec-DNS" },
291 { IPCPOPT_SECNBNS, "Sec-NBNS" },
292 { 0, NULL }
293 };
294
295 #define IPCPOPT_IPCOMP_HDRCOMP 0x61 /* rfc3544 */
296 #define IPCPOPT_IPCOMP_MINLEN 14
297
298 static const struct tok ipcpopt_compproto_values[] = {
299 { PPP_VJC, "VJ-Comp" },
300 { IPCPOPT_IPCOMP_HDRCOMP, "IP Header Compression" },
301 { 0, NULL }
302 };
303
304 static const struct tok ipcpopt_compproto_subopt_values[] = {
305 { 1, "RTP-Compression" },
306 { 2, "Enhanced RTP-Compression" },
307 { 0, NULL }
308 };
309
310 /* IP6CP Config Options */
311 #define IP6CP_IFID 1
312
313 static const struct tok ip6cpopt_values[] = {
314 { IP6CP_IFID, "Interface-ID" },
315 { 0, NULL }
316 };
317
318 /* ATCP - to be supported */
319 /* OSINLCP - to be supported */
320 /* BVCP - to be supported */
321 /* BCP - to be supported */
322 /* IPXCP - to be supported */
323 /* MPLSCP - to be supported */
324
325 /* Auth Algorithms */
326
327 /* 0-4 Reserved (RFC1994) */
328 #define AUTHALG_CHAPMD5 5 /* RFC1994 */
329 #define AUTHALG_MSCHAP1 128 /* RFC2433 */
330 #define AUTHALG_MSCHAP2 129 /* RFC2795 */
331
332 static const struct tok authalg_values[] = {
333 { AUTHALG_CHAPMD5, "MD5" },
334 { AUTHALG_MSCHAP1, "MS-CHAPv1" },
335 { AUTHALG_MSCHAP2, "MS-CHAPv2" },
336 { 0, NULL }
337 };
338
339 /* FCS Alternatives - to be supported */
340
341 /* Multilink Endpoint Discriminator (RFC1717) */
342 #define MEDCLASS_NULL 0 /* Null Class */
343 #define MEDCLASS_LOCAL 1 /* Locally Assigned */
344 #define MEDCLASS_IPV4 2 /* Internet Protocol (IPv4) */
345 #define MEDCLASS_MAC 3 /* IEEE 802.1 global MAC address */
346 #define MEDCLASS_MNB 4 /* PPP Magic Number Block */
347 #define MEDCLASS_PSNDN 5 /* Public Switched Network Director Number */
348
349 /* PPP LCP Callback */
350 #define CALLBACK_AUTH 0 /* Location determined by user auth */
351 #define CALLBACK_DSTR 1 /* Dialing string */
352 #define CALLBACK_LID 2 /* Location identifier */
353 #define CALLBACK_E164 3 /* E.164 number */
354 #define CALLBACK_X500 4 /* X.500 distinguished name */
355 #define CALLBACK_CBCP 6 /* Location is determined during CBCP nego */
356
357 static const struct tok ppp_callback_values[] = {
358 { CALLBACK_AUTH, "UserAuth" },
359 { CALLBACK_DSTR, "DialString" },
360 { CALLBACK_LID, "LocalID" },
361 { CALLBACK_E164, "E.164" },
362 { CALLBACK_X500, "X.500" },
363 { CALLBACK_CBCP, "CBCP" },
364 { 0, NULL }
365 };
366
367 /* CHAP */
368
369 #define CHAP_CHAL 1
370 #define CHAP_RESP 2
371 #define CHAP_SUCC 3
372 #define CHAP_FAIL 4
373
374 static const struct tok chapcode_values[] = {
375 { CHAP_CHAL, "Challenge" },
376 { CHAP_RESP, "Response" },
377 { CHAP_SUCC, "Success" },
378 { CHAP_FAIL, "Fail" },
379 { 0, NULL}
380 };
381
382 /* PAP */
383
384 #define PAP_AREQ 1
385 #define PAP_AACK 2
386 #define PAP_ANAK 3
387
388 static const struct tok papcode_values[] = {
389 { PAP_AREQ, "Auth-Req" },
390 { PAP_AACK, "Auth-ACK" },
391 { PAP_ANAK, "Auth-NACK" },
392 { 0, NULL }
393 };
394
395 /* BAP */
396 #define BAP_CALLREQ 1
397 #define BAP_CALLRES 2
398 #define BAP_CBREQ 3
399 #define BAP_CBRES 4
400 #define BAP_LDQREQ 5
401 #define BAP_LDQRES 6
402 #define BAP_CSIND 7
403 #define BAP_CSRES 8
404
405 static u_int print_lcp_config_options(netdissect_options *, const u_char *p, u_int);
406 static u_int print_ipcp_config_options(netdissect_options *, const u_char *p, u_int);
407 static u_int print_ip6cp_config_options(netdissect_options *, const u_char *p, u_int);
408 static u_int print_ccp_config_options(netdissect_options *, const u_char *p, u_int);
409 static u_int print_bacp_config_options(netdissect_options *, const u_char *p, u_int);
410 static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, u_int length);
411
412 /* generic Control Protocol (e.g. LCP, IPCP, CCP, etc.) handler */
413 static void
414 handle_ctrl_proto(netdissect_options *ndo,
415 u_int proto, const u_char *pptr, u_int length)
416 {
417 const char *typestr;
418 u_int code, len;
419 u_int (*pfunc)(netdissect_options *, const u_char *, u_int);
420 u_int x, j;
421 const u_char *tptr;
422
423 tptr=pptr;
424
425 typestr = tok2str(ppptype2str, "unknown ctrl-proto (0x%04x)", proto);
426 ND_PRINT("%s, ", typestr);
427
428 if (length < 4) /* FIXME weak boundary checking */
429 goto trunc;
430 ND_TCHECK_2(tptr);
431
432 code = EXTRACT_U_1(tptr);
433 tptr++;
434
435 ND_PRINT("%s (0x%02x), id %u, length %u",
436 tok2str(cpcodes, "Unknown Opcode",code),
437 code,
438 EXTRACT_U_1(tptr), /* ID */
439 length + 2);
440 tptr++;
441
442 if (!ndo->ndo_vflag)
443 return;
444
445 ND_TCHECK_2(tptr);
446 len = EXTRACT_BE_U_2(tptr);
447 tptr += 2;
448
449 if (len < 4) {
450 ND_PRINT("\n\tencoded length %u (< 4))", len);
451 return;
452 }
453
454 if (len > length) {
455 ND_PRINT("\n\tencoded length %u (> packet length %u))", len, length);
456 return;
457 }
458 length = len;
459
460 ND_PRINT("\n\tencoded length %u (=Option(s) length %u)", len, len - 4);
461
462 if (length == 4)
463 return; /* there may be a NULL confreq etc. */
464
465 if (ndo->ndo_vflag > 1)
466 print_unknown_data(ndo, pptr - 2, "\n\t", 6);
467
468
469 switch (code) {
470 case CPCODES_VEXT:
471 if (length < 11)
472 break;
473 ND_TCHECK_4(tptr);
474 ND_PRINT("\n\t Magic-Num 0x%08x", EXTRACT_BE_U_4(tptr));
475 tptr += 4;
476 ND_TCHECK_3(tptr);
477 ND_PRINT(" Vendor: %s (%u)",
478 tok2str(oui_values,"Unknown",EXTRACT_BE_U_3(tptr)),
479 EXTRACT_BE_U_3(tptr));
480 /* XXX: need to decode Kind and Value(s)? */
481 break;
482 case CPCODES_CONF_REQ:
483 case CPCODES_CONF_ACK:
484 case CPCODES_CONF_NAK:
485 case CPCODES_CONF_REJ:
486 x = len - 4; /* Code(1), Identifier(1) and Length(2) */
487 do {
488 switch (proto) {
489 case PPP_LCP:
490 pfunc = print_lcp_config_options;
491 break;
492 case PPP_IPCP:
493 pfunc = print_ipcp_config_options;
494 break;
495 case PPP_IPV6CP:
496 pfunc = print_ip6cp_config_options;
497 break;
498 case PPP_CCP:
499 pfunc = print_ccp_config_options;
500 break;
501 case PPP_BACP:
502 pfunc = print_bacp_config_options;
503 break;
504 default:
505 /*
506 * No print routine for the options for
507 * this protocol.
508 */
509 pfunc = NULL;
510 break;
511 }
512
513 if (pfunc == NULL) /* catch the above null pointer if unknown CP */
514 break;
515
516 if ((j = (*pfunc)(ndo, tptr, len)) == 0)
517 break;
518 x -= j;
519 tptr += j;
520 } while (x != 0);
521 break;
522
523 case CPCODES_TERM_REQ:
524 case CPCODES_TERM_ACK:
525 /* XXX: need to decode Data? */
526 break;
527 case CPCODES_CODE_REJ:
528 /* XXX: need to decode Rejected-Packet? */
529 break;
530 case CPCODES_PROT_REJ:
531 if (length < 6)
532 break;
533 ND_TCHECK_2(tptr);
534 ND_PRINT("\n\t Rejected %s Protocol (0x%04x)",
535 tok2str(ppptype2str,"unknown", EXTRACT_BE_U_2(tptr)),
536 EXTRACT_BE_U_2(tptr));
537 /* XXX: need to decode Rejected-Information? - hexdump for now */
538 if (len > 6) {
539 ND_PRINT("\n\t Rejected Packet");
540 print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2);
541 }
542 break;
543 case CPCODES_ECHO_REQ:
544 case CPCODES_ECHO_RPL:
545 case CPCODES_DISC_REQ:
546 if (length < 8)
547 break;
548 ND_TCHECK_4(tptr);
549 ND_PRINT("\n\t Magic-Num 0x%08x", EXTRACT_BE_U_4(tptr));
550 /* XXX: need to decode Data? - hexdump for now */
551 if (len > 8) {
552 ND_PRINT("\n\t -----trailing data-----");
553 ND_TCHECK_LEN(tptr + 4, len - 8);
554 print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8);
555 }
556 break;
557 case CPCODES_ID:
558 if (length < 8)
559 break;
560 ND_TCHECK_4(tptr);
561 ND_PRINT("\n\t Magic-Num 0x%08x", EXTRACT_BE_U_4(tptr));
562 /* RFC 1661 says this is intended to be human readable */
563 if (len > 8) {
564 ND_PRINT("\n\t Message\n\t ");
565 if (fn_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend))
566 goto trunc;
567 }
568 break;
569 case CPCODES_TIME_REM:
570 if (length < 12)
571 break;
572 ND_TCHECK_4(tptr);
573 ND_PRINT("\n\t Magic-Num 0x%08x", EXTRACT_BE_U_4(tptr));
574 ND_TCHECK_4(tptr + 4);
575 ND_PRINT(", Seconds-Remaining %us", EXTRACT_BE_U_4(tptr + 4));
576 /* XXX: need to decode Message? */
577 break;
578 default:
579 /* XXX this is dirty but we do not get the
580 * original pointer passed to the begin
581 * the PPP packet */
582 if (ndo->ndo_vflag <= 1)
583 print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2);
584 break;
585 }
586 return;
587
588 trunc:
589 ND_PRINT("[|%s]", typestr);
590 }
591
592 /* LCP config options */
593 static u_int
594 print_lcp_config_options(netdissect_options *ndo,
595 const u_char *p, u_int length)
596 {
597 u_int opt, len;
598
599 if (length < 2)
600 return 0;
601 ND_TCHECK_2(p);
602 opt = EXTRACT_U_1(p);
603 len = EXTRACT_U_1(p + 1);
604 if (length < len)
605 return 0;
606 if (len < 2) {
607 if (opt < NUM_LCPOPTS)
608 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
609 lcpconfopts[opt], opt, len);
610 else
611 ND_PRINT("\n\tunknown LCP option 0x%02x", opt);
612 return 0;
613 }
614 if (opt < NUM_LCPOPTS)
615 ND_PRINT("\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len);
616 else {
617 ND_PRINT("\n\tunknown LCP option 0x%02x", opt);
618 return len;
619 }
620
621 switch (opt) {
622 case LCPOPT_VEXT:
623 if (len < 6) {
624 ND_PRINT(" (length bogus, should be >= 6)");
625 return len;
626 }
627 ND_TCHECK_3(p + 2);
628 ND_PRINT(": Vendor: %s (%u)",
629 tok2str(oui_values,"Unknown",EXTRACT_BE_U_3(p + 2)),
630 EXTRACT_BE_U_3(p + 2));
631 #if 0
632 ND_TCHECK_1(p + 5);
633 ND_PRINT(", kind: 0x%02x", EXTRACT_U_1(p + 5));
634 ND_PRINT(", Value: 0x");
635 for (i = 0; i < len - 6; i++) {
636 ND_TCHECK_1(p + 6 + i);
637 ND_PRINT("%02x", EXTRACT_U_1(p + 6 + i));
638 }
639 #endif
640 break;
641 case LCPOPT_MRU:
642 if (len != 4) {
643 ND_PRINT(" (length bogus, should be = 4)");
644 return len;
645 }
646 ND_TCHECK_2(p + 2);
647 ND_PRINT(": %u", EXTRACT_BE_U_2(p + 2));
648 break;
649 case LCPOPT_ACCM:
650 if (len != 6) {
651 ND_PRINT(" (length bogus, should be = 6)");
652 return len;
653 }
654 ND_TCHECK_4(p + 2);
655 ND_PRINT(": 0x%08x", EXTRACT_BE_U_4(p + 2));
656 break;
657 case LCPOPT_AP:
658 if (len < 4) {
659 ND_PRINT(" (length bogus, should be >= 4)");
660 return len;
661 }
662 ND_TCHECK_2(p + 2);
663 ND_PRINT(": %s", tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", EXTRACT_BE_U_2(p + 2)));
664
665 switch (EXTRACT_BE_U_2(p + 2)) {
666 case PPP_CHAP:
667 ND_TCHECK_1(p + 4);
668 ND_PRINT(", %s", tok2str(authalg_values, "Unknown Auth Alg %u", EXTRACT_U_1(p + 4)));
669 break;
670 case PPP_PAP: /* fall through */
671 case PPP_EAP:
672 case PPP_SPAP:
673 case PPP_SPAP_OLD:
674 break;
675 default:
676 print_unknown_data(ndo, p, "\n\t", len);
677 }
678 break;
679 case LCPOPT_QP:
680 if (len < 4) {
681 ND_PRINT(" (length bogus, should be >= 4)");
682 return 0;
683 }
684 ND_TCHECK_2(p + 2);
685 if (EXTRACT_BE_U_2(p + 2) == PPP_LQM)
686 ND_PRINT(": LQR");
687 else
688 ND_PRINT(": unknown");
689 break;
690 case LCPOPT_MN:
691 if (len != 6) {
692 ND_PRINT(" (length bogus, should be = 6)");
693 return 0;
694 }
695 ND_TCHECK_4(p + 2);
696 ND_PRINT(": 0x%08x", EXTRACT_BE_U_4(p + 2));
697 break;
698 case LCPOPT_PFC:
699 break;
700 case LCPOPT_ACFC:
701 break;
702 case LCPOPT_LD:
703 if (len != 4) {
704 ND_PRINT(" (length bogus, should be = 4)");
705 return 0;
706 }
707 ND_TCHECK_2(p + 2);
708 ND_PRINT(": 0x%04x", EXTRACT_BE_U_2(p + 2));
709 break;
710 case LCPOPT_CBACK:
711 if (len < 3) {
712 ND_PRINT(" (length bogus, should be >= 3)");
713 return 0;
714 }
715 ND_PRINT(": ");
716 ND_TCHECK_1(p + 2);
717 ND_PRINT(": Callback Operation %s (%u)",
718 tok2str(ppp_callback_values, "Unknown", EXTRACT_U_1(p + 2)),
719 EXTRACT_U_1(p + 2));
720 break;
721 case LCPOPT_MLMRRU:
722 if (len != 4) {
723 ND_PRINT(" (length bogus, should be = 4)");
724 return 0;
725 }
726 ND_TCHECK_2(p + 2);
727 ND_PRINT(": %u", EXTRACT_BE_U_2(p + 2));
728 break;
729 case LCPOPT_MLED:
730 if (len < 3) {
731 ND_PRINT(" (length bogus, should be >= 3)");
732 return 0;
733 }
734 ND_TCHECK_1(p + 2);
735 switch (EXTRACT_U_1(p + 2)) { /* class */
736 case MEDCLASS_NULL:
737 ND_PRINT(": Null");
738 break;
739 case MEDCLASS_LOCAL:
740 ND_PRINT(": Local"); /* XXX */
741 break;
742 case MEDCLASS_IPV4:
743 if (len != 7) {
744 ND_PRINT(" (length bogus, should be = 7)");
745 return 0;
746 }
747 ND_TCHECK_4(p + 3);
748 ND_PRINT(": IPv4 %s", ipaddr_string(ndo, p + 3));
749 break;
750 case MEDCLASS_MAC:
751 if (len != 9) {
752 ND_PRINT(" (length bogus, should be = 9)");
753 return 0;
754 }
755 ND_TCHECK_6(p + 3);
756 ND_PRINT(": MAC %s", etheraddr_string(ndo, p + 3));
757 break;
758 case MEDCLASS_MNB:
759 ND_PRINT(": Magic-Num-Block"); /* XXX */
760 break;
761 case MEDCLASS_PSNDN:
762 ND_PRINT(": PSNDN"); /* XXX */
763 break;
764 default:
765 ND_PRINT(": Unknown class %u", EXTRACT_U_1(p + 2));
766 break;
767 }
768 break;
769
770 /* XXX: to be supported */
771 #if 0
772 case LCPOPT_DEP6:
773 case LCPOPT_FCSALT:
774 case LCPOPT_SDP:
775 case LCPOPT_NUMMODE:
776 case LCPOPT_DEP12:
777 case LCPOPT_DEP14:
778 case LCPOPT_DEP15:
779 case LCPOPT_DEP16:
780 case LCPOPT_MLSSNHF:
781 case LCPOPT_PROP:
782 case LCPOPT_DCEID:
783 case LCPOPT_MPP:
784 case LCPOPT_LCPAOPT:
785 case LCPOPT_COBS:
786 case LCPOPT_PE:
787 case LCPOPT_MLHF:
788 case LCPOPT_I18N:
789 case LCPOPT_SDLOS:
790 case LCPOPT_PPPMUX:
791 break;
792 #endif
793 default:
794 /*
795 * Unknown option; dump it as raw bytes now if we're
796 * not going to do so below.
797 */
798 if (ndo->ndo_vflag < 2)
799 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
800 break;
801 }
802
803 if (ndo->ndo_vflag > 1)
804 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
805
806 return len;
807
808 trunc:
809 ND_PRINT("[|lcp]");
810 return 0;
811 }
812
813 /* ML-PPP*/
814 static const struct tok ppp_ml_flag_values[] = {
815 { 0x80, "begin" },
816 { 0x40, "end" },
817 { 0, NULL }
818 };
819
820 static void
821 handle_mlppp(netdissect_options *ndo,
822 const u_char *p, u_int length)
823 {
824 if (!ndo->ndo_eflag)
825 ND_PRINT("MLPPP, ");
826
827 if (length < 2) {
828 ND_PRINT("[|mlppp]");
829 return;
830 }
831 if (!ND_TTEST_2(p)) {
832 ND_PRINT("[|mlppp]");
833 return;
834 }
835
836 ND_PRINT("seq 0x%03x, Flags [%s], length %u",
837 (EXTRACT_BE_U_2(p))&0x0fff, /* only support 12-Bit sequence space for now */
838 bittok2str(ppp_ml_flag_values, "none", EXTRACT_U_1(p) & 0xc0),
839 length);
840 }
841
842 /* CHAP */
843 static void
844 handle_chap(netdissect_options *ndo,
845 const u_char *p, u_int length)
846 {
847 u_int code, len;
848 u_int val_size, name_size, msg_size;
849 const u_char *p0;
850 u_int i;
851
852 p0 = p;
853 if (length < 1) {
854 ND_PRINT("[|chap]");
855 return;
856 } else if (length < 4) {
857 ND_TCHECK_1(p);
858 ND_PRINT("[|chap 0x%02x]", EXTRACT_U_1(p));
859 return;
860 }
861
862 ND_TCHECK_1(p);
863 code = EXTRACT_U_1(p);
864 ND_PRINT("CHAP, %s (0x%02x)",
865 tok2str(chapcode_values,"unknown",code),
866 code);
867 p++;
868
869 ND_TCHECK_1(p);
870 ND_PRINT(", id %u", EXTRACT_U_1(p)); /* ID */
871 p++;
872
873 ND_TCHECK_2(p);
874 len = EXTRACT_BE_U_2(p);
875 p += 2;
876
877 /*
878 * Note that this is a generic CHAP decoding routine. Since we
879 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
880 * MS-CHAPv2) is used at this point, we can't decode packet
881 * specifically to each algorithms. Instead, we simply decode
882 * the GCD (Gratest Common Denominator) for all algorithms.
883 */
884 switch (code) {
885 case CHAP_CHAL:
886 case CHAP_RESP:
887 if (length - (p - p0) < 1)
888 return;
889 ND_TCHECK_1(p);
890 val_size = EXTRACT_U_1(p); /* value size */
891 p++;
892 if (length - (p - p0) < val_size)
893 return;
894 ND_PRINT(", Value ");
895 for (i = 0; i < val_size; i++) {
896 ND_TCHECK_1(p);
897 ND_PRINT("%02x", EXTRACT_U_1(p));
898 p++;
899 }
900 name_size = len - (p - p0);
901 ND_PRINT(", Name ");
902 for (i = 0; i < name_size; i++) {
903 ND_TCHECK_1(p);
904 safeputchar(ndo, EXTRACT_U_1(p));
905 p++;
906 }
907 break;
908 case CHAP_SUCC:
909 case CHAP_FAIL:
910 msg_size = len - (p - p0);
911 ND_PRINT(", Msg ");
912 for (i = 0; i< msg_size; i++) {
913 ND_TCHECK_1(p);
914 safeputchar(ndo, EXTRACT_U_1(p));
915 p++;
916 }
917 break;
918 }
919 return;
920
921 trunc:
922 ND_PRINT("[|chap]");
923 }
924
925 /* PAP (see RFC 1334) */
926 static void
927 handle_pap(netdissect_options *ndo,
928 const u_char *p, u_int length)
929 {
930 u_int code, len;
931 u_int peerid_len, passwd_len, msg_len;
932 const u_char *p0;
933 u_int i;
934
935 p0 = p;
936 if (length < 1) {
937 ND_PRINT("[|pap]");
938 return;
939 } else if (length < 4) {
940 ND_TCHECK_1(p);
941 ND_PRINT("[|pap 0x%02x]", EXTRACT_U_1(p));
942 return;
943 }
944
945 ND_TCHECK_1(p);
946 code = EXTRACT_U_1(p);
947 ND_PRINT("PAP, %s (0x%02x)",
948 tok2str(papcode_values, "unknown", code),
949 code);
950 p++;
951
952 ND_TCHECK_1(p);
953 ND_PRINT(", id %u", EXTRACT_U_1(p)); /* ID */
954 p++;
955
956 ND_TCHECK_2(p);
957 len = EXTRACT_BE_U_2(p);
958 p += 2;
959
960 if (len > length) {
961 ND_PRINT(", length %u > packet size", len);
962 return;
963 }
964 length = len;
965 if (length < (size_t)(p - p0)) {
966 ND_PRINT(", length %u < PAP header length", length);
967 return;
968 }
969
970 switch (code) {
971 case PAP_AREQ:
972 /* A valid Authenticate-Request is 6 or more octets long. */
973 if (len < 6)
974 goto trunc;
975 if (length - (p - p0) < 1)
976 return;
977 ND_TCHECK_1(p);
978 peerid_len = EXTRACT_U_1(p); /* Peer-ID Length */
979 p++;
980 if (length - (p - p0) < peerid_len)
981 return;
982 ND_PRINT(", Peer ");
983 for (i = 0; i < peerid_len; i++) {
984 ND_TCHECK_1(p);
985 safeputchar(ndo, EXTRACT_U_1(p));
986 p++;
987 }
988
989 if (length - (p - p0) < 1)
990 return;
991 ND_TCHECK_1(p);
992 passwd_len = EXTRACT_U_1(p); /* Password Length */
993 p++;
994 if (length - (p - p0) < passwd_len)
995 return;
996 ND_PRINT(", Name ");
997 for (i = 0; i < passwd_len; i++) {
998 ND_TCHECK_1(p);
999 safeputchar(ndo, EXTRACT_U_1(p));
1000 p++;
1001 }
1002 break;
1003 case PAP_AACK:
1004 case PAP_ANAK:
1005 /* Although some implementations ignore truncation at
1006 * this point and at least one generates a truncated
1007 * packet, RFC 1334 section 2.2.2 clearly states that
1008 * both AACK and ANAK are at least 5 bytes long.
1009 */
1010 if (len < 5)
1011 goto trunc;
1012 if (length - (p - p0) < 1)
1013 return;
1014 ND_TCHECK_1(p);
1015 msg_len = EXTRACT_U_1(p); /* Msg-Length */
1016 p++;
1017 if (length - (p - p0) < msg_len)
1018 return;
1019 ND_PRINT(", Msg ");
1020 for (i = 0; i< msg_len; i++) {
1021 ND_TCHECK_1(p);
1022 safeputchar(ndo, EXTRACT_U_1(p));
1023 p++;
1024 }
1025 break;
1026 }
1027 return;
1028
1029 trunc:
1030 ND_PRINT("[|pap]");
1031 }
1032
1033 /* BAP */
1034 static void
1035 handle_bap(netdissect_options *ndo _U_,
1036 const u_char *p _U_, u_int length _U_)
1037 {
1038 /* XXX: to be supported!! */
1039 }
1040
1041
1042 /* IPCP config options */
1043 static u_int
1044 print_ipcp_config_options(netdissect_options *ndo,
1045 const u_char *p, u_int length)
1046 {
1047 u_int opt, len;
1048 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
1049
1050 if (length < 2)
1051 return 0;
1052 ND_TCHECK_2(p);
1053 opt = EXTRACT_U_1(p);
1054 len = EXTRACT_U_1(p + 1);
1055 if (length < len)
1056 return 0;
1057 if (len < 2) {
1058 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1059 tok2str(ipcpopt_values,"unknown",opt),
1060 opt,
1061 len);
1062 return 0;
1063 }
1064
1065 ND_PRINT("\n\t %s Option (0x%02x), length %u",
1066 tok2str(ipcpopt_values,"unknown",opt),
1067 opt,
1068 len);
1069
1070 switch (opt) {
1071 case IPCPOPT_2ADDR: /* deprecated */
1072 if (len != 10) {
1073 ND_PRINT(" (length bogus, should be = 10)");
1074 return len;
1075 }
1076 ND_TCHECK_4(p + 6);
1077 ND_PRINT(": src %s, dst %s",
1078 ipaddr_string(ndo, p + 2),
1079 ipaddr_string(ndo, p + 6));
1080 break;
1081 case IPCPOPT_IPCOMP:
1082 if (len < 4) {
1083 ND_PRINT(" (length bogus, should be >= 4)");
1084 return 0;
1085 }
1086 ND_TCHECK_2(p + 2);
1087 compproto = EXTRACT_BE_U_2(p + 2);
1088
1089 ND_PRINT(": %s (0x%02x):",
1090 tok2str(ipcpopt_compproto_values, "Unknown", compproto),
1091 compproto);
1092
1093 switch (compproto) {
1094 case PPP_VJC:
1095 /* XXX: VJ-Comp parameters should be decoded */
1096 break;
1097 case IPCPOPT_IPCOMP_HDRCOMP:
1098 if (len < IPCPOPT_IPCOMP_MINLEN) {
1099 ND_PRINT(" (length bogus, should be >= %u)",
1100 IPCPOPT_IPCOMP_MINLEN);
1101 return 0;
1102 }
1103
1104 ND_TCHECK_LEN(p + 2, IPCPOPT_IPCOMP_MINLEN);
1105 ND_PRINT("\n\t TCP Space %u, non-TCP Space %u"
1106 ", maxPeriod %u, maxTime %u, maxHdr %u",
1107 EXTRACT_BE_U_2(p + 4),
1108 EXTRACT_BE_U_2(p + 6),
1109 EXTRACT_BE_U_2(p + 8),
1110 EXTRACT_BE_U_2(p + 10),
1111 EXTRACT_BE_U_2(p + 12));
1112
1113 /* suboptions present ? */
1114 if (len > IPCPOPT_IPCOMP_MINLEN) {
1115 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
1116 p += IPCPOPT_IPCOMP_MINLEN;
1117
1118 ND_PRINT("\n\t Suboptions, length %u", ipcomp_subopttotallen);
1119
1120 while (ipcomp_subopttotallen >= 2) {
1121 ND_TCHECK_2(p);
1122 ipcomp_subopt = EXTRACT_U_1(p);
1123 ipcomp_suboptlen = EXTRACT_U_1(p + 1);
1124
1125 /* sanity check */
1126 if (ipcomp_subopt == 0 ||
1127 ipcomp_suboptlen == 0 )
1128 break;
1129
1130 /* XXX: just display the suboptions for now */
1131 ND_PRINT("\n\t\t%s Suboption #%u, length %u",
1132 tok2str(ipcpopt_compproto_subopt_values,
1133 "Unknown",
1134 ipcomp_subopt),
1135 ipcomp_subopt,
1136 ipcomp_suboptlen);
1137
1138 ipcomp_subopttotallen -= ipcomp_suboptlen;
1139 p += ipcomp_suboptlen;
1140 }
1141 }
1142 break;
1143 default:
1144 break;
1145 }
1146 break;
1147
1148 case IPCPOPT_ADDR: /* those options share the same format - fall through */
1149 case IPCPOPT_MOBILE4:
1150 case IPCPOPT_PRIDNS:
1151 case IPCPOPT_PRINBNS:
1152 case IPCPOPT_SECDNS:
1153 case IPCPOPT_SECNBNS:
1154 if (len != 6) {
1155 ND_PRINT(" (length bogus, should be = 6)");
1156 return 0;
1157 }
1158 ND_TCHECK_4(p + 2);
1159 ND_PRINT(": %s", ipaddr_string(ndo, p + 2));
1160 break;
1161 default:
1162 /*
1163 * Unknown option; dump it as raw bytes now if we're
1164 * not going to do so below.
1165 */
1166 if (ndo->ndo_vflag < 2)
1167 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
1168 break;
1169 }
1170 if (ndo->ndo_vflag > 1)
1171 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
1172 return len;
1173
1174 trunc:
1175 ND_PRINT("[|ipcp]");
1176 return 0;
1177 }
1178
1179 /* IP6CP config options */
1180 static u_int
1181 print_ip6cp_config_options(netdissect_options *ndo,
1182 const u_char *p, u_int length)
1183 {
1184 u_int opt, len;
1185
1186 if (length < 2)
1187 return 0;
1188 ND_TCHECK_2(p);
1189 opt = EXTRACT_U_1(p);
1190 len = EXTRACT_U_1(p + 1);
1191 if (length < len)
1192 return 0;
1193 if (len < 2) {
1194 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1195 tok2str(ip6cpopt_values,"unknown",opt),
1196 opt,
1197 len);
1198 return 0;
1199 }
1200
1201 ND_PRINT("\n\t %s Option (0x%02x), length %u",
1202 tok2str(ip6cpopt_values,"unknown",opt),
1203 opt,
1204 len);
1205
1206 switch (opt) {
1207 case IP6CP_IFID:
1208 if (len != 10) {
1209 ND_PRINT(" (length bogus, should be = 10)");
1210 return len;
1211 }
1212 ND_TCHECK_8(p + 2);
1213 ND_PRINT(": %04x:%04x:%04x:%04x",
1214 EXTRACT_BE_U_2(p + 2),
1215 EXTRACT_BE_U_2(p + 4),
1216 EXTRACT_BE_U_2(p + 6),
1217 EXTRACT_BE_U_2(p + 8));
1218 break;
1219 default:
1220 /*
1221 * Unknown option; dump it as raw bytes now if we're
1222 * not going to do so below.
1223 */
1224 if (ndo->ndo_vflag < 2)
1225 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
1226 break;
1227 }
1228 if (ndo->ndo_vflag > 1)
1229 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
1230
1231 return len;
1232
1233 trunc:
1234 ND_PRINT("[|ip6cp]");
1235 return 0;
1236 }
1237
1238
1239 /* CCP config options */
1240 static u_int
1241 print_ccp_config_options(netdissect_options *ndo,
1242 const u_char *p, u_int length)
1243 {
1244 u_int opt, len;
1245
1246 if (length < 2)
1247 return 0;
1248 ND_TCHECK_2(p);
1249 opt = EXTRACT_U_1(p);
1250 len = EXTRACT_U_1(p + 1);
1251 if (length < len)
1252 return 0;
1253 if (len < 2) {
1254 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1255 tok2str(ccpconfopts_values, "Unknown", opt),
1256 opt,
1257 len);
1258 return 0;
1259 }
1260
1261 ND_PRINT("\n\t %s Option (0x%02x), length %u",
1262 tok2str(ccpconfopts_values, "Unknown", opt),
1263 opt,
1264 len);
1265
1266 switch (opt) {
1267 case CCPOPT_BSDCOMP:
1268 if (len < 3) {
1269 ND_PRINT(" (length bogus, should be >= 3)");
1270 return len;
1271 }
1272 ND_TCHECK_1(p + 2);
1273 ND_PRINT(": Version: %u, Dictionary Bits: %u",
1274 EXTRACT_U_1(p + 2) >> 5,
1275 EXTRACT_U_1(p + 2) & 0x1f);
1276 break;
1277 case CCPOPT_MVRCA:
1278 if (len < 4) {
1279 ND_PRINT(" (length bogus, should be >= 4)");
1280 return len;
1281 }
1282 ND_TCHECK_1(p + 3);
1283 ND_PRINT(": Features: %u, PxP: %s, History: %u, #CTX-ID: %u",
1284 (EXTRACT_U_1(p + 2) & 0xc0) >> 6,
1285 (EXTRACT_U_1(p + 2) & 0x20) ? "Enabled" : "Disabled",
1286 EXTRACT_U_1(p + 2) & 0x1f,
1287 EXTRACT_U_1(p + 3));
1288 break;
1289 case CCPOPT_DEFLATE:
1290 if (len < 4) {
1291 ND_PRINT(" (length bogus, should be >= 4)");
1292 return len;
1293 }
1294 ND_TCHECK_1(p + 3);
1295 ND_PRINT(": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u",
1296 (EXTRACT_U_1(p + 2) & 0xf0) >> 4,
1297 ((EXTRACT_U_1(p + 2) & 0x0f) == 8) ? "zlib" : "unknown",
1298 EXTRACT_U_1(p + 2) & 0x0f,
1299 (EXTRACT_U_1(p + 3) & 0xfc) >> 2,
1300 EXTRACT_U_1(p + 3) & 0x03);
1301 break;
1302
1303 /* XXX: to be supported */
1304 #if 0
1305 case CCPOPT_OUI:
1306 case CCPOPT_PRED1:
1307 case CCPOPT_PRED2:
1308 case CCPOPT_PJUMP:
1309 case CCPOPT_HPPPC:
1310 case CCPOPT_STACLZS:
1311 case CCPOPT_MPPC:
1312 case CCPOPT_GFZA:
1313 case CCPOPT_V42BIS:
1314 case CCPOPT_LZSDCP:
1315 case CCPOPT_DEC:
1316 case CCPOPT_RESV:
1317 break;
1318 #endif
1319 default:
1320 /*
1321 * Unknown option; dump it as raw bytes now if we're
1322 * not going to do so below.
1323 */
1324 if (ndo->ndo_vflag < 2)
1325 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
1326 break;
1327 }
1328 if (ndo->ndo_vflag > 1)
1329 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
1330
1331 return len;
1332
1333 trunc:
1334 ND_PRINT("[|ccp]");
1335 return 0;
1336 }
1337
1338 /* BACP config options */
1339 static u_int
1340 print_bacp_config_options(netdissect_options *ndo,
1341 const u_char *p, u_int length)
1342 {
1343 u_int opt, len;
1344
1345 if (length < 2)
1346 return 0;
1347 ND_TCHECK_2(p);
1348 opt = EXTRACT_U_1(p);
1349 len = EXTRACT_U_1(p + 1);
1350 if (length < len)
1351 return 0;
1352 if (len < 2) {
1353 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1354 tok2str(bacconfopts_values, "Unknown", opt),
1355 opt,
1356 len);
1357 return 0;
1358 }
1359
1360 ND_PRINT("\n\t %s Option (0x%02x), length %u",
1361 tok2str(bacconfopts_values, "Unknown", opt),
1362 opt,
1363 len);
1364
1365 switch (opt) {
1366 case BACPOPT_FPEER:
1367 if (len != 6) {
1368 ND_PRINT(" (length bogus, should be = 6)");
1369 return len;
1370 }
1371 ND_TCHECK_4(p + 2);
1372 ND_PRINT(": Magic-Num 0x%08x", EXTRACT_BE_U_4(p + 2));
1373 break;
1374 default:
1375 /*
1376 * Unknown option; dump it as raw bytes now if we're
1377 * not going to do so below.
1378 */
1379 if (ndo->ndo_vflag < 2)
1380 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
1381 break;
1382 }
1383 if (ndo->ndo_vflag > 1)
1384 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
1385
1386 return len;
1387
1388 trunc:
1389 ND_PRINT("[|bacp]");
1390 return 0;
1391 }
1392
1393 static void
1394 ppp_hdlc(netdissect_options *ndo,
1395 const u_char *p, u_int length)
1396 {
1397 u_char *b, *t, c;
1398 const u_char *s;
1399 u_int i, proto;
1400 const void *se;
1401
1402 if (length == 0)
1403 return;
1404
1405 b = (u_char *)nd_malloc(ndo, length);
1406 if (b == NULL)
1407 return;
1408
1409 /*
1410 * Unescape all the data into a temporary, private, buffer.
1411 * Do this so that we dont overwrite the original packet
1412 * contents.
1413 */
1414 for (s = p, t = b, i = length; i != 0 && ND_TTEST_1(s); i--) {
1415 c = EXTRACT_U_1(s);
1416 s++;
1417 if (c == 0x7d) {
1418 if (i <= 1 || !ND_TTEST_1(s))
1419 break;
1420 i--;
1421 c = EXTRACT_U_1(s) ^ 0x20;
1422 s++;
1423 }
1424 *t++ = c;
1425 }
1426
1427 /*
1428 * Change the end pointer, so bounds checks work.
1429 */
1430 se = ndo->ndo_snapend;
1431 ndo->ndo_snapend = t;
1432 length = t - b;
1433
1434 /* now lets guess about the payload codepoint format */
1435 if (length < 1)
1436 goto trunc;
1437 proto = EXTRACT_U_1(b); /* start with a one-octet codepoint guess */
1438
1439 switch (proto) {
1440 case PPP_IP:
1441 ip_print(ndo, b + 1, length - 1);
1442 goto cleanup;
1443 case PPP_IPV6:
1444 ip6_print(ndo, b + 1, length - 1);
1445 goto cleanup;
1446 default: /* no luck - try next guess */
1447 break;
1448 }
1449
1450 if (length < 2)
1451 goto trunc;
1452 proto = EXTRACT_BE_U_2(b); /* next guess - load two octets */
1453
1454 switch (proto) {
1455 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */
1456 if (length < 4)
1457 goto trunc;
1458 proto = EXTRACT_BE_U_2(b + 2); /* load the PPP proto-id */
1459 handle_ppp(ndo, proto, b + 4, length - 4);
1460 break;
1461 default: /* last guess - proto must be a PPP proto-id */
1462 handle_ppp(ndo, proto, b + 2, length - 2);
1463 break;
1464 }
1465
1466 cleanup:
1467 ndo->ndo_snapend = se;
1468 return;
1469
1470 trunc:
1471 ndo->ndo_snapend = se;
1472 ND_PRINT("[|ppp]");
1473 }
1474
1475
1476 /* PPP */
1477 static void
1478 handle_ppp(netdissect_options *ndo,
1479 u_int proto, const u_char *p, u_int length)
1480 {
1481 if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */
1482 ppp_hdlc(ndo, p - 1, length);
1483 return;
1484 }
1485
1486 switch (proto) {
1487 case PPP_LCP: /* fall through */
1488 case PPP_IPCP:
1489 case PPP_OSICP:
1490 case PPP_MPLSCP:
1491 case PPP_IPV6CP:
1492 case PPP_CCP:
1493 case PPP_BACP:
1494 handle_ctrl_proto(ndo, proto, p, length);
1495 break;
1496 case PPP_ML:
1497 handle_mlppp(ndo, p, length);
1498 break;
1499 case PPP_CHAP:
1500 handle_chap(ndo, p, length);
1501 break;
1502 case PPP_PAP:
1503 handle_pap(ndo, p, length);
1504 break;
1505 case PPP_BAP: /* XXX: not yet completed */
1506 handle_bap(ndo, p, length);
1507 break;
1508 case ETHERTYPE_IP: /*XXX*/
1509 case PPP_VJNC:
1510 case PPP_IP:
1511 ip_print(ndo, p, length);
1512 break;
1513 case ETHERTYPE_IPV6: /*XXX*/
1514 case PPP_IPV6:
1515 ip6_print(ndo, p, length);
1516 break;
1517 case ETHERTYPE_IPX: /*XXX*/
1518 case PPP_IPX:
1519 ipx_print(ndo, p, length);
1520 break;
1521 case PPP_OSI:
1522 isoclns_print(ndo, p, length);
1523 break;
1524 case PPP_MPLS_UCAST:
1525 case PPP_MPLS_MCAST:
1526 mpls_print(ndo, p, length);
1527 break;
1528 case PPP_COMP:
1529 ND_PRINT("compressed PPP data");
1530 break;
1531 default:
1532 ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1533 print_unknown_data(ndo, p, "\n\t", length);
1534 break;
1535 }
1536 }
1537
1538 /* Standard PPP printer */
1539 u_int
1540 ppp_print(netdissect_options *ndo,
1541 const u_char *p, u_int length)
1542 {
1543 u_int proto,ppp_header;
1544 u_int olen = length; /* _o_riginal length */
1545 u_int hdr_len = 0;
1546
1547 ndo->ndo_protocol = "ppp";
1548 /*
1549 * Here, we assume that p points to the Address and Control
1550 * field (if they present).
1551 */
1552 if (length < 2)
1553 goto trunc;
1554 ND_TCHECK_2(p);
1555 ppp_header = EXTRACT_BE_U_2(p);
1556
1557 switch(ppp_header) {
1558 case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL):
1559 if (ndo->ndo_eflag) ND_PRINT("In ");
1560 p += 2;
1561 length -= 2;
1562 hdr_len += 2;
1563 break;
1564 case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL):
1565 if (ndo->ndo_eflag) ND_PRINT("Out ");
1566 p += 2;
1567 length -= 2;
1568 hdr_len += 2;
1569 break;
1570 case (PPP_ADDRESS << 8 | PPP_CONTROL):
1571 p += 2; /* ACFC not used */
1572 length -= 2;
1573 hdr_len += 2;
1574 break;
1575
1576 default:
1577 break;
1578 }
1579
1580 if (length < 2)
1581 goto trunc;
1582 ND_TCHECK_1(p);
1583 if (EXTRACT_U_1(p) % 2) {
1584 proto = EXTRACT_U_1(p); /* PFC is used */
1585 p++;
1586 length--;
1587 hdr_len++;
1588 } else {
1589 ND_TCHECK_2(p);
1590 proto = EXTRACT_BE_U_2(p);
1591 p += 2;
1592 length -= 2;
1593 hdr_len += 2;
1594 }
1595
1596 if (ndo->ndo_eflag)
1597 ND_PRINT("%s (0x%04x), length %u: ",
1598 tok2str(ppptype2str, "unknown", proto),
1599 proto,
1600 olen);
1601
1602 handle_ppp(ndo, proto, p, length);
1603 return (hdr_len);
1604 trunc:
1605 ND_PRINT("[|ppp]");
1606 return (0);
1607 }
1608
1609
1610 /* PPP I/F printer */
1611 u_int
1612 ppp_if_print(netdissect_options *ndo,
1613 const struct pcap_pkthdr *h, const u_char *p)
1614 {
1615 u_int length = h->len;
1616 u_int caplen = h->caplen;
1617
1618 ndo->ndo_protocol = "ppp_if";
1619 if (caplen < PPP_HDRLEN) {
1620 ND_PRINT("[|ppp]");
1621 return (caplen);
1622 }
1623
1624 #if 0
1625 /*
1626 * XXX: seems to assume that there are 2 octets prepended to an
1627 * actual PPP frame. The 1st octet looks like Input/Output flag
1628 * while 2nd octet is unknown, at least to me
1629 * (mshindo@mshindo.net).
1630 *
1631 * That was what the original tcpdump code did.
1632 *
1633 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1634 * packets and 0 for inbound packets - but only if the
1635 * protocol field has the 0x8000 bit set (i.e., it's a network
1636 * control protocol); it does so before running the packet through
1637 * "bpf_filter" to see if it should be discarded, and to see
1638 * if we should update the time we sent the most recent packet...
1639 *
1640 * ...but it puts the original address field back after doing
1641 * so.
1642 *
1643 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1644 *
1645 * I don't know if any PPP implementation handed up to a BPF
1646 * device packets with the first octet being 1 for outbound and
1647 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1648 * whether that ever needs to be checked or not.
1649 *
1650 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1651 * and its tcpdump appears to assume that the frame always
1652 * begins with an address field and a control field, and that
1653 * the address field might be 0x0f or 0x8f, for Cisco
1654 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1655 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1656 * RFC 1662.
1657 *
1658 * (Is the Cisco framing in question what DLT_C_HDLC, in
1659 * BSD/OS, is?)
1660 */
1661 if (ndo->ndo_eflag)
1662 ND_PRINT("%c %4d %02x ", EXTRACT_U_1(p) ? 'O' : 'I',
1663 length, EXTRACT_U_1(p + 1));
1664 #endif
1665
1666 ppp_print(ndo, p, length);
1667
1668 return (0);
1669 }
1670
1671 /*
1672 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1673 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1674 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1675 * discard them *if* those are the first two octets, and parse the remaining
1676 * packet as a PPP packet, as "ppp_print()" does).
1677 *
1678 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1679 */
1680 u_int
1681 ppp_hdlc_if_print(netdissect_options *ndo,
1682 const struct pcap_pkthdr *h, const u_char *p)
1683 {
1684 u_int length = h->len;
1685 u_int caplen = h->caplen;
1686 u_int proto;
1687 u_int hdrlen = 0;
1688
1689 ndo->ndo_protocol = "ppp_hdlc_if";
1690 if (caplen < 2) {
1691 ND_PRINT("[|ppp]");
1692 return (caplen);
1693 }
1694
1695 switch (EXTRACT_U_1(p)) {
1696
1697 case PPP_ADDRESS:
1698 if (caplen < 4 || length < 4) {
1699 ND_PRINT("[|ppp]");
1700 return (caplen);
1701 }
1702
1703 if (ndo->ndo_eflag)
1704 ND_PRINT("%02x %02x %u ", EXTRACT_U_1(p),
1705 EXTRACT_U_1(p + 1), length);
1706 p += 2;
1707 length -= 2;
1708 hdrlen += 2;
1709
1710 proto = EXTRACT_BE_U_2(p);
1711 p += 2;
1712 length -= 2;
1713 hdrlen += 2;
1714 ND_PRINT("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1715
1716 handle_ppp(ndo, proto, p, length);
1717 break;
1718
1719 case CHDLC_UNICAST:
1720 case CHDLC_BCAST:
1721 return (chdlc_if_print(ndo, h, p));
1722
1723 default:
1724 if (caplen < 4) {
1725 ND_PRINT("[|ppp]");
1726 return (caplen);
1727 }
1728
1729 if (ndo->ndo_eflag)
1730 ND_PRINT("%02x %02x %u ", EXTRACT_U_1(p),
1731 EXTRACT_U_1(p + 1), length);
1732 p += 2;
1733 hdrlen += 2;
1734
1735 /*
1736 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1737 * the next two octets as an Ethernet type; does that
1738 * ever happen?
1739 */
1740 ND_PRINT("unknown addr %02x; ctrl %02x", EXTRACT_U_1(p),
1741 EXTRACT_U_1(p + 1));
1742 break;
1743 }
1744
1745 return (hdrlen);
1746 }
1747
1748 #define PPP_BSDI_HDRLEN 24
1749
1750 /* BSD/OS specific PPP printer */
1751 u_int
1752 ppp_bsdos_if_print(netdissect_options *ndo _U_,
1753 const struct pcap_pkthdr *h _U_, const u_char *p _U_)
1754 {
1755 u_int hdrlength;
1756 #ifdef __bsdi__
1757 u_int length = h->len;
1758 u_int caplen = h->caplen;
1759 uint16_t ptype;
1760 uint8_t llhl;
1761 const u_char *q;
1762 u_int i;
1763
1764 ndo->ndo_protocol = "ppp_bsdos_if";
1765 if (caplen < PPP_BSDI_HDRLEN) {
1766 ND_PRINT("[|ppp]");
1767 return (caplen);
1768 }
1769
1770 hdrlength = 0;
1771
1772 #if 0
1773 if (EXTRACT_U_1(p) == PPP_ADDRESS &&
1774 EXTRACT_U_1(p + 1) == PPP_CONTROL) {
1775 if (ndo->ndo_eflag)
1776 ND_PRINT("%02x %02x ", EXTRACT_U_1(p),
1777 EXTRACT_U_1(p + 1));
1778 p += 2;
1779 hdrlength = 2;
1780 }
1781
1782 if (ndo->ndo_eflag)
1783 ND_PRINT("%u ", length);
1784 /* Retrieve the protocol type */
1785 if (EXTRACT_U_1(p) & 01) {
1786 /* Compressed protocol field */
1787 ptype = EXTRACT_U_1(p);
1788 if (ndo->ndo_eflag)
1789 ND_PRINT("%02x ", ptype);
1790 p++;
1791 hdrlength += 1;
1792 } else {
1793 /* Un-compressed protocol field */
1794 ptype = EXTRACT_BE_U_2(p);
1795 if (ndo->ndo_eflag)
1796 ND_PRINT("%04x ", ptype);
1797 p += 2;
1798 hdrlength += 2;
1799 }
1800 #else
1801 ptype = 0; /*XXX*/
1802 if (ndo->ndo_eflag)
1803 ND_PRINT("%c ", EXTRACT_U_1(p + SLC_DIR) ? 'O' : 'I');
1804 llhl = EXTRACT_U_1(p + SLC_LLHL);
1805 if (llhl) {
1806 /* link level header */
1807 struct ppp_header *ph;
1808
1809 q = p + SLC_BPFHDRLEN;
1810 ph = (struct ppp_header *)q;
1811 if (ph->phdr_addr == PPP_ADDRESS
1812 && ph->phdr_ctl == PPP_CONTROL) {
1813 if (ndo->ndo_eflag)
1814 ND_PRINT("%02x %02x ", EXTRACT_U_1(q),
1815 EXTRACT_U_1(q + 1));
1816 ptype = EXTRACT_BE_U_2(&ph->phdr_type);
1817 if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1818 ND_PRINT("%s ", tok2str(ppptype2str,
1819 "proto-#%u", ptype));
1820 }
1821 } else {
1822 if (ndo->ndo_eflag) {
1823 ND_PRINT("LLH=[");
1824 for (i = 0; i < llhl; i++)
1825 ND_PRINT("%02x", EXTRACT_U_1(q + i));
1826 ND_PRINT("] ");
1827 }
1828 }
1829 }
1830 if (ndo->ndo_eflag)
1831 ND_PRINT("%u ", length);
1832 if (EXTRACT_U_1(p + SLC_CHL)) {
1833 q = p + SLC_BPFHDRLEN + llhl;
1834
1835 switch (ptype) {
1836 case PPP_VJC:
1837 ptype = vjc_print(ndo, q, ptype);
1838 hdrlength = PPP_BSDI_HDRLEN;
1839 p += hdrlength;
1840 switch (ptype) {
1841 case PPP_IP:
1842 ip_print(ndo, p, length);
1843 break;
1844 case PPP_IPV6:
1845 ip6_print(ndo, p, length);
1846 break;
1847 case PPP_MPLS_UCAST:
1848 case PPP_MPLS_MCAST:
1849 mpls_print(ndo, p, length);
1850 break;
1851 }
1852 goto printx;
1853 case PPP_VJNC:
1854 ptype = vjc_print(ndo, q, ptype);
1855 hdrlength = PPP_BSDI_HDRLEN;
1856 p += hdrlength;
1857 switch (ptype) {
1858 case PPP_IP:
1859 ip_print(ndo, p, length);
1860 break;
1861 case PPP_IPV6:
1862 ip6_print(ndo, p, length);
1863 break;
1864 case PPP_MPLS_UCAST:
1865 case PPP_MPLS_MCAST:
1866 mpls_print(ndo, p, length);
1867 break;
1868 }
1869 goto printx;
1870 default:
1871 if (ndo->ndo_eflag) {
1872 ND_PRINT("CH=[");
1873 for (i = 0; i < llhl; i++)
1874 ND_PRINT("%02x",
1875 EXTRACT_U_1(q + i));
1876 ND_PRINT("] ");
1877 }
1878 break;
1879 }
1880 }
1881
1882 hdrlength = PPP_BSDI_HDRLEN;
1883 #endif
1884
1885 length -= hdrlength;
1886 p += hdrlength;
1887
1888 switch (ptype) {
1889 case PPP_IP:
1890 ip_print(p, length);
1891 break;
1892 case PPP_IPV6:
1893 ip6_print(ndo, p, length);
1894 break;
1895 case PPP_MPLS_UCAST:
1896 case PPP_MPLS_MCAST:
1897 mpls_print(ndo, p, length);
1898 break;
1899 default:
1900 ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1901 }
1902
1903 printx:
1904 #else /* __bsdi */
1905 hdrlength = 0;
1906 #endif /* __bsdi__ */
1907 return (hdrlength);
1908 }
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