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Merge illumos-gate
[unleashed.git] / contrib / tcpdump / print-ppp.c
blob891761728bbb7450368c7b838e8a82c1d7c681bd
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
55 /*
56 * The following constatns are defined by IANA. Please refer to
57 * http://www.isi.edu/in-notes/iana/assignments/ppp-numbers
58 * for the up-to-date information.
59 */
60
61 /* Protocol Codes defined in ppp.h */
62
63 static const struct tok ppptype2str[] = {
64 { PPP_IP, "IP" },
65 { PPP_OSI, "OSI" },
66 { PPP_NS, "NS" },
67 { PPP_DECNET, "DECNET" },
68 { PPP_APPLE, "APPLE" },
69 { PPP_IPX, "IPX" },
70 { PPP_VJC, "VJC IP" },
71 { PPP_VJNC, "VJNC IP" },
72 { PPP_BRPDU, "BRPDU" },
73 { PPP_STII, "STII" },
74 { PPP_VINES, "VINES" },
75 { PPP_MPLS_UCAST, "MPLS" },
76 { PPP_MPLS_MCAST, "MPLS" },
77 { PPP_COMP, "Compressed"},
78 { PPP_ML, "MLPPP"},
79 { PPP_IPV6, "IP6"},
80
81 { PPP_HELLO, "HELLO" },
82 { PPP_LUXCOM, "LUXCOM" },
83 { PPP_SNS, "SNS" },
84 { PPP_IPCP, "IPCP" },
85 { PPP_OSICP, "OSICP" },
86 { PPP_NSCP, "NSCP" },
87 { PPP_DECNETCP, "DECNETCP" },
88 { PPP_APPLECP, "APPLECP" },
89 { PPP_IPXCP, "IPXCP" },
90 { PPP_STIICP, "STIICP" },
91 { PPP_VINESCP, "VINESCP" },
92 { PPP_IPV6CP, "IP6CP" },
93 { PPP_MPLSCP, "MPLSCP" },
94
95 { PPP_LCP, "LCP" },
96 { PPP_PAP, "PAP" },
97 { PPP_LQM, "LQM" },
98 { PPP_CHAP, "CHAP" },
99 { PPP_EAP, "EAP" },
100 { PPP_SPAP, "SPAP" },
101 { PPP_SPAP_OLD, "Old-SPAP" },
102 { PPP_BACP, "BACP" },
103 { PPP_BAP, "BAP" },
104 { PPP_MPCP, "MLPPP-CP" },
105 { PPP_CCP, "CCP" },
106 { 0, NULL }
107 };
108
109 /* Control Protocols (LCP/IPCP/CCP etc.) Codes defined in RFC 1661 */
110
111 #define CPCODES_VEXT 0 /* Vendor-Specific (RFC2153) */
112 #define CPCODES_CONF_REQ 1 /* Configure-Request */
113 #define CPCODES_CONF_ACK 2 /* Configure-Ack */
114 #define CPCODES_CONF_NAK 3 /* Configure-Nak */
115 #define CPCODES_CONF_REJ 4 /* Configure-Reject */
116 #define CPCODES_TERM_REQ 5 /* Terminate-Request */
117 #define CPCODES_TERM_ACK 6 /* Terminate-Ack */
118 #define CPCODES_CODE_REJ 7 /* Code-Reject */
119 #define CPCODES_PROT_REJ 8 /* Protocol-Reject (LCP only) */
120 #define CPCODES_ECHO_REQ 9 /* Echo-Request (LCP only) */
121 #define CPCODES_ECHO_RPL 10 /* Echo-Reply (LCP only) */
122 #define CPCODES_DISC_REQ 11 /* Discard-Request (LCP only) */
123 #define CPCODES_ID 12 /* Identification (LCP only) RFC1570 */
124 #define CPCODES_TIME_REM 13 /* Time-Remaining (LCP only) RFC1570 */
125 #define CPCODES_RESET_REQ 14 /* Reset-Request (CCP only) RFC1962 */
126 #define CPCODES_RESET_REP 15 /* Reset-Reply (CCP only) */
127
128 static const struct tok cpcodes[] = {
129 {CPCODES_VEXT, "Vendor-Extension"}, /* RFC2153 */
130 {CPCODES_CONF_REQ, "Conf-Request"},
131 {CPCODES_CONF_ACK, "Conf-Ack"},
132 {CPCODES_CONF_NAK, "Conf-Nack"},
133 {CPCODES_CONF_REJ, "Conf-Reject"},
134 {CPCODES_TERM_REQ, "Term-Request"},
135 {CPCODES_TERM_ACK, "Term-Ack"},
136 {CPCODES_CODE_REJ, "Code-Reject"},
137 {CPCODES_PROT_REJ, "Prot-Reject"},
138 {CPCODES_ECHO_REQ, "Echo-Request"},
139 {CPCODES_ECHO_RPL, "Echo-Reply"},
140 {CPCODES_DISC_REQ, "Disc-Req"},
141 {CPCODES_ID, "Ident"}, /* RFC1570 */
142 {CPCODES_TIME_REM, "Time-Rem"}, /* RFC1570 */
143 {CPCODES_RESET_REQ, "Reset-Req"}, /* RFC1962 */
144 {CPCODES_RESET_REP, "Reset-Ack"}, /* RFC1962 */
145 {0, NULL}
146 };
147
148 /* LCP Config Options */
149
150 #define LCPOPT_VEXT 0
151 #define LCPOPT_MRU 1
152 #define LCPOPT_ACCM 2
153 #define LCPOPT_AP 3
154 #define LCPOPT_QP 4
155 #define LCPOPT_MN 5
156 #define LCPOPT_DEP6 6
157 #define LCPOPT_PFC 7
158 #define LCPOPT_ACFC 8
159 #define LCPOPT_FCSALT 9
160 #define LCPOPT_SDP 10
161 #define LCPOPT_NUMMODE 11
162 #define LCPOPT_DEP12 12
163 #define LCPOPT_CBACK 13
164 #define LCPOPT_DEP14 14
165 #define LCPOPT_DEP15 15
166 #define LCPOPT_DEP16 16
167 #define LCPOPT_MLMRRU 17
168 #define LCPOPT_MLSSNHF 18
169 #define LCPOPT_MLED 19
170 #define LCPOPT_PROP 20
171 #define LCPOPT_DCEID 21
172 #define LCPOPT_MPP 22
173 #define LCPOPT_LD 23
174 #define LCPOPT_LCPAOPT 24
175 #define LCPOPT_COBS 25
176 #define LCPOPT_PE 26
177 #define LCPOPT_MLHF 27
178 #define LCPOPT_I18N 28
179 #define LCPOPT_SDLOS 29
180 #define LCPOPT_PPPMUX 30
181
182 #define LCPOPT_MIN LCPOPT_VEXT
183 #define LCPOPT_MAX LCPOPT_PPPMUX
184
185 static const char *lcpconfopts[] = {
186 "Vend-Ext", /* (0) */
187 "MRU", /* (1) */
188 "ACCM", /* (2) */
189 "Auth-Prot", /* (3) */
190 "Qual-Prot", /* (4) */
191 "Magic-Num", /* (5) */
192 "deprecated(6)", /* used to be a Quality Protocol */
193 "PFC", /* (7) */
194 "ACFC", /* (8) */
195 "FCS-Alt", /* (9) */
196 "SDP", /* (10) */
197 "Num-Mode", /* (11) */
198 "deprecated(12)", /* used to be a Multi-Link-Procedure*/
199 "Call-Back", /* (13) */
200 "deprecated(14)", /* used to be a Connect-Time */
201 "deprecated(15)", /* used to be a Compund-Frames */
202 "deprecated(16)", /* used to be a Nominal-Data-Encap */
203 "MRRU", /* (17) */
204 "12-Bit seq #", /* (18) */
205 "End-Disc", /* (19) */
206 "Proprietary", /* (20) */
207 "DCE-Id", /* (21) */
208 "MP+", /* (22) */
209 "Link-Disc", /* (23) */
210 "LCP-Auth-Opt", /* (24) */
211 "COBS", /* (25) */
212 "Prefix-elision", /* (26) */
213 "Multilink-header-Form",/* (27) */
214 "I18N", /* (28) */
215 "SDL-over-SONET/SDH", /* (29) */
216 "PPP-Muxing", /* (30) */
217 };
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 int print_lcp_config_options(netdissect_options *, const u_char *p, int);
406 static int print_ipcp_config_options(netdissect_options *, const u_char *p, int);
407 static int print_ip6cp_config_options(netdissect_options *, const u_char *p, int);
408 static int print_ccp_config_options(netdissect_options *, const u_char *p, int);
409 static int print_bacp_config_options(netdissect_options *, const u_char *p, int);
410 static void handle_ppp(netdissect_options *, u_int proto, const u_char *p, 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, int length)
416 {
417 const char *typestr;
418 u_int code, len;
419 int (*pfunc)(netdissect_options *, const u_char *, int);
420 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((ndo, "%s, ", typestr));
427
428 if (length < 4) /* FIXME weak boundary checking */
429 goto trunc;
430 ND_TCHECK2(*tptr, 2);
431
432 code = *tptr++;
433
434 ND_PRINT((ndo, "%s (0x%02x), id %u, length %u",
435 tok2str(cpcodes, "Unknown Opcode",code),
436 code,
437 *tptr++, /* ID */
438 length + 2));
439
440 if (!ndo->ndo_vflag)
441 return;
442
443 if (length <= 4)
444 return; /* there may be a NULL confreq etc. */
445
446 ND_TCHECK2(*tptr, 2);
447 len = EXTRACT_16BITS(tptr);
448 tptr += 2;
449
450 ND_PRINT((ndo, "\n\tencoded length %u (=Option(s) length %u)", len, len - 4));
451
452 if (ndo->ndo_vflag > 1)
453 print_unknown_data(ndo, pptr - 2, "\n\t", 6);
454
455
456 switch (code) {
457 case CPCODES_VEXT:
458 if (length < 11)
459 break;
460 ND_TCHECK2(*tptr, 4);
461 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)));
462 tptr += 4;
463 ND_TCHECK2(*tptr, 3);
464 ND_PRINT((ndo, " Vendor: %s (%u)",
465 tok2str(oui_values,"Unknown",EXTRACT_24BITS(tptr)),
466 EXTRACT_24BITS(tptr)));
467 /* XXX: need to decode Kind and Value(s)? */
468 break;
469 case CPCODES_CONF_REQ:
470 case CPCODES_CONF_ACK:
471 case CPCODES_CONF_NAK:
472 case CPCODES_CONF_REJ:
473 x = len - 4; /* Code(1), Identifier(1) and Length(2) */
474 do {
475 switch (proto) {
476 case PPP_LCP:
477 pfunc = print_lcp_config_options;
478 break;
479 case PPP_IPCP:
480 pfunc = print_ipcp_config_options;
481 break;
482 case PPP_IPV6CP:
483 pfunc = print_ip6cp_config_options;
484 break;
485 case PPP_CCP:
486 pfunc = print_ccp_config_options;
487 break;
488 case PPP_BACP:
489 pfunc = print_bacp_config_options;
490 break;
491 default:
492 /*
493 * No print routine for the options for
494 * this protocol.
495 */
496 pfunc = NULL;
497 break;
498 }
499
500 if (pfunc == NULL) /* catch the above null pointer if unknown CP */
501 break;
502
503 if ((j = (*pfunc)(ndo, tptr, len)) == 0)
504 break;
505 x -= j;
506 tptr += j;
507 } while (x > 0);
508 break;
509
510 case CPCODES_TERM_REQ:
511 case CPCODES_TERM_ACK:
512 /* XXX: need to decode Data? */
513 break;
514 case CPCODES_CODE_REJ:
515 /* XXX: need to decode Rejected-Packet? */
516 break;
517 case CPCODES_PROT_REJ:
518 if (length < 6)
519 break;
520 ND_TCHECK2(*tptr, 2);
521 ND_PRINT((ndo, "\n\t Rejected %s Protocol (0x%04x)",
522 tok2str(ppptype2str,"unknown", EXTRACT_16BITS(tptr)),
523 EXTRACT_16BITS(tptr)));
524 /* XXX: need to decode Rejected-Information? - hexdump for now */
525 if (len > 6) {
526 ND_PRINT((ndo, "\n\t Rejected Packet"));
527 print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2);
528 }
529 break;
530 case CPCODES_ECHO_REQ:
531 case CPCODES_ECHO_RPL:
532 case CPCODES_DISC_REQ:
533 if (length < 8)
534 break;
535 ND_TCHECK2(*tptr, 4);
536 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)));
537 /* XXX: need to decode Data? - hexdump for now */
538 if (len > 8) {
539 ND_PRINT((ndo, "\n\t -----trailing data-----"));
540 ND_TCHECK2(tptr[4], len - 8);
541 print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8);
542 }
543 break;
544 case CPCODES_ID:
545 if (length < 8)
546 break;
547 ND_TCHECK2(*tptr, 4);
548 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)));
549 /* RFC 1661 says this is intended to be human readable */
550 if (len > 8) {
551 ND_PRINT((ndo, "\n\t Message\n\t "));
552 if (fn_printn(ndo, tptr + 4, len - 4, ndo->ndo_snapend))
553 goto trunc;
554 }
555 break;
556 case CPCODES_TIME_REM:
557 if (length < 12)
558 break;
559 ND_TCHECK2(*tptr, 4);
560 ND_PRINT((ndo, "\n\t Magic-Num 0x%08x", EXTRACT_32BITS(tptr)));
561 ND_TCHECK2(*(tptr + 4), 4);
562 ND_PRINT((ndo, ", Seconds-Remaining %us", EXTRACT_32BITS(tptr + 4)));
563 /* XXX: need to decode Message? */
564 break;
565 default:
566 /* XXX this is dirty but we do not get the
567 * original pointer passed to the begin
568 * the PPP packet */
569 if (ndo->ndo_vflag <= 1)
570 print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2);
571 break;
572 }
573 return;
574
575 trunc:
576 ND_PRINT((ndo, "[|%s]", typestr));
577 }
578
579 /* LCP config options */
580 static int
581 print_lcp_config_options(netdissect_options *ndo,
582 const u_char *p, int length)
583 {
584 int len, opt;
585
586 if (length < 2)
587 return 0;
588 ND_TCHECK2(*p, 2);
589 len = p[1];
590 opt = p[0];
591 if (length < len)
592 return 0;
593 if (len < 2) {
594 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
595 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
596 lcpconfopts[opt], opt, len));
597 else
598 ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt));
599 return 0;
600 }
601 if ((opt >= LCPOPT_MIN) && (opt <= LCPOPT_MAX))
602 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len));
603 else {
604 ND_PRINT((ndo, "\n\tunknown LCP option 0x%02x", opt));
605 return len;
606 }
607
608 switch (opt) {
609 case LCPOPT_VEXT:
610 if (len < 6) {
611 ND_PRINT((ndo, " (length bogus, should be >= 6)"));
612 return len;
613 }
614 ND_TCHECK_24BITS(p + 2);
615 ND_PRINT((ndo, ": Vendor: %s (%u)",
616 tok2str(oui_values,"Unknown",EXTRACT_24BITS(p+2)),
617 EXTRACT_24BITS(p + 2)));
618 #if 0
619 ND_TCHECK(p[5]);
620 ND_PRINT((ndo, ", kind: 0x%02x", p[5]));
621 ND_PRINT((ndo, ", Value: 0x"));
622 for (i = 0; i < len - 6; i++) {
623 ND_TCHECK(p[6 + i]);
624 ND_PRINT((ndo, "%02x", p[6 + i]));
625 }
626 #endif
627 break;
628 case LCPOPT_MRU:
629 if (len != 4) {
630 ND_PRINT((ndo, " (length bogus, should be = 4)"));
631 return len;
632 }
633 ND_TCHECK_16BITS(p + 2);
634 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2)));
635 break;
636 case LCPOPT_ACCM:
637 if (len != 6) {
638 ND_PRINT((ndo, " (length bogus, should be = 6)"));
639 return len;
640 }
641 ND_TCHECK_32BITS(p + 2);
642 ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2)));
643 break;
644 case LCPOPT_AP:
645 if (len < 4) {
646 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
647 return len;
648 }
649 ND_TCHECK_16BITS(p + 2);
650 ND_PRINT((ndo, ": %s", tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", EXTRACT_16BITS(p + 2))));
651
652 switch (EXTRACT_16BITS(p+2)) {
653 case PPP_CHAP:
654 ND_TCHECK(p[4]);
655 ND_PRINT((ndo, ", %s", tok2str(authalg_values, "Unknown Auth Alg %u", p[4])));
656 break;
657 case PPP_PAP: /* fall through */
658 case PPP_EAP:
659 case PPP_SPAP:
660 case PPP_SPAP_OLD:
661 break;
662 default:
663 print_unknown_data(ndo, p, "\n\t", len);
664 }
665 break;
666 case LCPOPT_QP:
667 if (len < 4) {
668 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
669 return 0;
670 }
671 ND_TCHECK_16BITS(p+2);
672 if (EXTRACT_16BITS(p+2) == PPP_LQM)
673 ND_PRINT((ndo, ": LQR"));
674 else
675 ND_PRINT((ndo, ": unknown"));
676 break;
677 case LCPOPT_MN:
678 if (len != 6) {
679 ND_PRINT((ndo, " (length bogus, should be = 6)"));
680 return 0;
681 }
682 ND_TCHECK_32BITS(p + 2);
683 ND_PRINT((ndo, ": 0x%08x", EXTRACT_32BITS(p + 2)));
684 break;
685 case LCPOPT_PFC:
686 break;
687 case LCPOPT_ACFC:
688 break;
689 case LCPOPT_LD:
690 if (len != 4) {
691 ND_PRINT((ndo, " (length bogus, should be = 4)"));
692 return 0;
693 }
694 ND_TCHECK_16BITS(p + 2);
695 ND_PRINT((ndo, ": 0x%04x", EXTRACT_16BITS(p + 2)));
696 break;
697 case LCPOPT_CBACK:
698 if (len < 3) {
699 ND_PRINT((ndo, " (length bogus, should be >= 3)"));
700 return 0;
701 }
702 ND_PRINT((ndo, ": "));
703 ND_TCHECK(p[2]);
704 ND_PRINT((ndo, ": Callback Operation %s (%u)",
705 tok2str(ppp_callback_values, "Unknown", p[2]),
706 p[2]));
707 break;
708 case LCPOPT_MLMRRU:
709 if (len != 4) {
710 ND_PRINT((ndo, " (length bogus, should be = 4)"));
711 return 0;
712 }
713 ND_TCHECK_16BITS(p + 2);
714 ND_PRINT((ndo, ": %u", EXTRACT_16BITS(p + 2)));
715 break;
716 case LCPOPT_MLED:
717 if (len < 3) {
718 ND_PRINT((ndo, " (length bogus, should be >= 3)"));
719 return 0;
720 }
721 ND_TCHECK(p[2]);
722 switch (p[2]) { /* class */
723 case MEDCLASS_NULL:
724 ND_PRINT((ndo, ": Null"));
725 break;
726 case MEDCLASS_LOCAL:
727 ND_PRINT((ndo, ": Local")); /* XXX */
728 break;
729 case MEDCLASS_IPV4:
730 if (len != 7) {
731 ND_PRINT((ndo, " (length bogus, should be = 7)"));
732 return 0;
733 }
734 ND_TCHECK2(*(p + 3), 4);
735 ND_PRINT((ndo, ": IPv4 %s", ipaddr_string(ndo, p + 3)));
736 break;
737 case MEDCLASS_MAC:
738 if (len != 9) {
739 ND_PRINT((ndo, " (length bogus, should be = 9)"));
740 return 0;
741 }
742 ND_TCHECK2(*(p + 3), 6);
743 ND_PRINT((ndo, ": MAC %s", etheraddr_string(ndo, p + 3)));
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 if (length < 2) {
815 ND_PRINT((ndo, "[|mlppp]"));
816 return;
817 }
818 if (!ND_TTEST_16BITS(p)) {
819 ND_PRINT((ndo, "[|mlppp]"));
820 return;
821 }
822
823 ND_PRINT((ndo, "seq 0x%03x, Flags [%s], length %u",
824 (EXTRACT_16BITS(p))&0x0fff, /* only support 12-Bit sequence space for now */
825 bittok2str(ppp_ml_flag_values, "none", *p & 0xc0),
826 length));
827 }
828
829 /* CHAP */
830 static void
831 handle_chap(netdissect_options *ndo,
832 const u_char *p, int length)
833 {
834 u_int code, len;
835 int val_size, name_size, msg_size;
836 const u_char *p0;
837 int i;
838
839 p0 = p;
840 if (length < 1) {
841 ND_PRINT((ndo, "[|chap]"));
842 return;
843 } else if (length < 4) {
844 ND_TCHECK(*p);
845 ND_PRINT((ndo, "[|chap 0x%02x]", *p));
846 return;
847 }
848
849 ND_TCHECK(*p);
850 code = *p;
851 ND_PRINT((ndo, "CHAP, %s (0x%02x)",
852 tok2str(chapcode_values,"unknown",code),
853 code));
854 p++;
855
856 ND_TCHECK(*p);
857 ND_PRINT((ndo, ", id %u", *p)); /* ID */
858 p++;
859
860 ND_TCHECK2(*p, 2);
861 len = EXTRACT_16BITS(p);
862 p += 2;
863
864 /*
865 * Note that this is a generic CHAP decoding routine. Since we
866 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
867 * MS-CHAPv2) is used at this point, we can't decode packet
868 * specifically to each algorithms. Instead, we simply decode
869 * the GCD (Gratest Common Denominator) for all algorithms.
870 */
871 switch (code) {
872 case CHAP_CHAL:
873 case CHAP_RESP:
874 if (length - (p - p0) < 1)
875 return;
876 ND_TCHECK(*p);
877 val_size = *p; /* value size */
878 p++;
879 if (length - (p - p0) < val_size)
880 return;
881 ND_PRINT((ndo, ", Value "));
882 for (i = 0; i < val_size; i++) {
883 ND_TCHECK(*p);
884 ND_PRINT((ndo, "%02x", *p++));
885 }
886 name_size = len - (p - p0);
887 ND_PRINT((ndo, ", Name "));
888 for (i = 0; i < name_size; i++) {
889 ND_TCHECK(*p);
890 safeputchar(ndo, *p++);
891 }
892 break;
893 case CHAP_SUCC:
894 case CHAP_FAIL:
895 msg_size = len - (p - p0);
896 ND_PRINT((ndo, ", Msg "));
897 for (i = 0; i< msg_size; i++) {
898 ND_TCHECK(*p);
899 safeputchar(ndo, *p++);
900 }
901 break;
902 }
903 return;
904
905 trunc:
906 ND_PRINT((ndo, "[|chap]"));
907 }
908
909 /* PAP (see RFC 1334) */
910 static void
911 handle_pap(netdissect_options *ndo,
912 const u_char *p, int length)
913 {
914 u_int code, len;
915 int peerid_len, passwd_len, msg_len;
916 const u_char *p0;
917 int i;
918
919 p0 = p;
920 if (length < 1) {
921 ND_PRINT((ndo, "[|pap]"));
922 return;
923 } else if (length < 4) {
924 ND_TCHECK(*p);
925 ND_PRINT((ndo, "[|pap 0x%02x]", *p));
926 return;
927 }
928
929 ND_TCHECK(*p);
930 code = *p;
931 ND_PRINT((ndo, "PAP, %s (0x%02x)",
932 tok2str(papcode_values, "unknown", code),
933 code));
934 p++;
935
936 ND_TCHECK(*p);
937 ND_PRINT((ndo, ", id %u", *p)); /* ID */
938 p++;
939
940 ND_TCHECK2(*p, 2);
941 len = EXTRACT_16BITS(p);
942 p += 2;
943
944 if ((int)len > length) {
945 ND_PRINT((ndo, ", length %u > packet size", len));
946 return;
947 }
948 length = len;
949 if (length < (p - p0)) {
950 ND_PRINT((ndo, ", length %u < PAP header length", length));
951 return;
952 }
953
954 switch (code) {
955 case PAP_AREQ:
956 /* A valid Authenticate-Request is 6 or more octets long. */
957 if (len < 6)
958 goto trunc;
959 if (length - (p - p0) < 1)
960 return;
961 ND_TCHECK(*p);
962 peerid_len = *p; /* Peer-ID Length */
963 p++;
964 if (length - (p - p0) < peerid_len)
965 return;
966 ND_PRINT((ndo, ", Peer "));
967 for (i = 0; i < peerid_len; i++) {
968 ND_TCHECK(*p);
969 safeputchar(ndo, *p++);
970 }
971
972 if (length - (p - p0) < 1)
973 return;
974 ND_TCHECK(*p);
975 passwd_len = *p; /* Password Length */
976 p++;
977 if (length - (p - p0) < passwd_len)
978 return;
979 ND_PRINT((ndo, ", Name "));
980 for (i = 0; i < passwd_len; i++) {
981 ND_TCHECK(*p);
982 safeputchar(ndo, *p++);
983 }
984 break;
985 case PAP_AACK:
986 case PAP_ANAK:
987 /* Although some implementations ignore truncation at
988 * this point and at least one generates a truncated
989 * packet, RFC 1334 section 2.2.2 clearly states that
990 * both AACK and ANAK are at least 5 bytes long.
991 */
992 if (len < 5)
993 goto trunc;
994 if (length - (p - p0) < 1)
995 return;
996 ND_TCHECK(*p);
997 msg_len = *p; /* Msg-Length */
998 p++;
999 if (length - (p - p0) < msg_len)
1000 return;
1001 ND_PRINT((ndo, ", Msg "));
1002 for (i = 0; i< msg_len; i++) {
1003 ND_TCHECK(*p);
1004 safeputchar(ndo, *p++);
1005 }
1006 break;
1007 }
1008 return;
1009
1010 trunc:
1011 ND_PRINT((ndo, "[|pap]"));
1012 }
1013
1014 /* BAP */
1015 static void
1016 handle_bap(netdissect_options *ndo _U_,
1017 const u_char *p _U_, int length _U_)
1018 {
1019 /* XXX: to be supported!! */
1020 }
1021
1022
1023 /* IPCP config options */
1024 static int
1025 print_ipcp_config_options(netdissect_options *ndo,
1026 const u_char *p, int length)
1027 {
1028 int len, opt;
1029 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
1030
1031 if (length < 2)
1032 return 0;
1033 ND_TCHECK2(*p, 2);
1034 len = p[1];
1035 opt = p[0];
1036 if (length < len)
1037 return 0;
1038 if (len < 2) {
1039 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1040 tok2str(ipcpopt_values,"unknown",opt),
1041 opt,
1042 len));
1043 return 0;
1044 }
1045
1046 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u",
1047 tok2str(ipcpopt_values,"unknown",opt),
1048 opt,
1049 len));
1050
1051 switch (opt) {
1052 case IPCPOPT_2ADDR: /* deprecated */
1053 if (len != 10) {
1054 ND_PRINT((ndo, " (length bogus, should be = 10)"));
1055 return len;
1056 }
1057 ND_TCHECK2(*(p + 6), 4);
1058 ND_PRINT((ndo, ": src %s, dst %s",
1059 ipaddr_string(ndo, p + 2),
1060 ipaddr_string(ndo, p + 6)));
1061 break;
1062 case IPCPOPT_IPCOMP:
1063 if (len < 4) {
1064 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
1065 return 0;
1066 }
1067 ND_TCHECK_16BITS(p+2);
1068 compproto = EXTRACT_16BITS(p+2);
1069
1070 ND_PRINT((ndo, ": %s (0x%02x):",
1071 tok2str(ipcpopt_compproto_values, "Unknown", compproto),
1072 compproto));
1073
1074 switch (compproto) {
1075 case PPP_VJC:
1076 /* XXX: VJ-Comp parameters should be decoded */
1077 break;
1078 case IPCPOPT_IPCOMP_HDRCOMP:
1079 if (len < IPCPOPT_IPCOMP_MINLEN) {
1080 ND_PRINT((ndo, " (length bogus, should be >= %u)",
1081 IPCPOPT_IPCOMP_MINLEN));
1082 return 0;
1083 }
1084
1085 ND_TCHECK2(*(p + 2), IPCPOPT_IPCOMP_MINLEN);
1086 ND_PRINT((ndo, "\n\t TCP Space %u, non-TCP Space %u" \
1087 ", maxPeriod %u, maxTime %u, maxHdr %u",
1088 EXTRACT_16BITS(p+4),
1089 EXTRACT_16BITS(p+6),
1090 EXTRACT_16BITS(p+8),
1091 EXTRACT_16BITS(p+10),
1092 EXTRACT_16BITS(p+12)));
1093
1094 /* suboptions present ? */
1095 if (len > IPCPOPT_IPCOMP_MINLEN) {
1096 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
1097 p += IPCPOPT_IPCOMP_MINLEN;
1098
1099 ND_PRINT((ndo, "\n\t Suboptions, length %u", ipcomp_subopttotallen));
1100
1101 while (ipcomp_subopttotallen >= 2) {
1102 ND_TCHECK2(*p, 2);
1103 ipcomp_subopt = *p;
1104 ipcomp_suboptlen = *(p+1);
1105
1106 /* sanity check */
1107 if (ipcomp_subopt == 0 ||
1108 ipcomp_suboptlen == 0 )
1109 break;
1110
1111 /* XXX: just display the suboptions for now */
1112 ND_PRINT((ndo, "\n\t\t%s Suboption #%u, length %u",
1113 tok2str(ipcpopt_compproto_subopt_values,
1114 "Unknown",
1115 ipcomp_subopt),
1116 ipcomp_subopt,
1117 ipcomp_suboptlen));
1118
1119 ipcomp_subopttotallen -= ipcomp_suboptlen;
1120 p += ipcomp_suboptlen;
1121 }
1122 }
1123 break;
1124 default:
1125 break;
1126 }
1127 break;
1128
1129 case IPCPOPT_ADDR: /* those options share the same format - fall through */
1130 case IPCPOPT_MOBILE4:
1131 case IPCPOPT_PRIDNS:
1132 case IPCPOPT_PRINBNS:
1133 case IPCPOPT_SECDNS:
1134 case IPCPOPT_SECNBNS:
1135 if (len != 6) {
1136 ND_PRINT((ndo, " (length bogus, should be = 6)"));
1137 return 0;
1138 }
1139 ND_TCHECK2(*(p + 2), 4);
1140 ND_PRINT((ndo, ": %s", ipaddr_string(ndo, p + 2)));
1141 break;
1142 default:
1143 /*
1144 * Unknown option; dump it as raw bytes now if we're
1145 * not going to do so below.
1146 */
1147 if (ndo->ndo_vflag < 2)
1148 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
1149 break;
1150 }
1151 if (ndo->ndo_vflag > 1)
1152 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
1153 return len;
1154
1155 trunc:
1156 ND_PRINT((ndo, "[|ipcp]"));
1157 return 0;
1158 }
1159
1160 /* IP6CP config options */
1161 static int
1162 print_ip6cp_config_options(netdissect_options *ndo,
1163 const u_char *p, int length)
1164 {
1165 int len, opt;
1166
1167 if (length < 2)
1168 return 0;
1169 ND_TCHECK2(*p, 2);
1170 len = p[1];
1171 opt = p[0];
1172 if (length < len)
1173 return 0;
1174 if (len < 2) {
1175 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1176 tok2str(ip6cpopt_values,"unknown",opt),
1177 opt,
1178 len));
1179 return 0;
1180 }
1181
1182 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u",
1183 tok2str(ip6cpopt_values,"unknown",opt),
1184 opt,
1185 len));
1186
1187 switch (opt) {
1188 case IP6CP_IFID:
1189 if (len != 10) {
1190 ND_PRINT((ndo, " (length bogus, should be = 10)"));
1191 return len;
1192 }
1193 ND_TCHECK2(*(p + 2), 8);
1194 ND_PRINT((ndo, ": %04x:%04x:%04x:%04x",
1195 EXTRACT_16BITS(p + 2),
1196 EXTRACT_16BITS(p + 4),
1197 EXTRACT_16BITS(p + 6),
1198 EXTRACT_16BITS(p + 8)));
1199 break;
1200 default:
1201 /*
1202 * Unknown option; dump it as raw bytes now if we're
1203 * not going to do so below.
1204 */
1205 if (ndo->ndo_vflag < 2)
1206 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
1207 break;
1208 }
1209 if (ndo->ndo_vflag > 1)
1210 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
1211
1212 return len;
1213
1214 trunc:
1215 ND_PRINT((ndo, "[|ip6cp]"));
1216 return 0;
1217 }
1218
1219
1220 /* CCP config options */
1221 static int
1222 print_ccp_config_options(netdissect_options *ndo,
1223 const u_char *p, int length)
1224 {
1225 int len, opt;
1226
1227 if (length < 2)
1228 return 0;
1229 ND_TCHECK2(*p, 2);
1230 len = p[1];
1231 opt = p[0];
1232 if (length < len)
1233 return 0;
1234 if (len < 2) {
1235 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1236 tok2str(ccpconfopts_values, "Unknown", opt),
1237 opt,
1238 len));
1239 return 0;
1240 }
1241
1242 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u",
1243 tok2str(ccpconfopts_values, "Unknown", opt),
1244 opt,
1245 len));
1246
1247 switch (opt) {
1248 case CCPOPT_BSDCOMP:
1249 if (len < 3) {
1250 ND_PRINT((ndo, " (length bogus, should be >= 3)"));
1251 return len;
1252 }
1253 ND_TCHECK(p[2]);
1254 ND_PRINT((ndo, ": Version: %u, Dictionary Bits: %u",
1255 p[2] >> 5, p[2] & 0x1f));
1256 break;
1257 case CCPOPT_MVRCA:
1258 if (len < 4) {
1259 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
1260 return len;
1261 }
1262 ND_TCHECK(p[3]);
1263 ND_PRINT((ndo, ": Features: %u, PxP: %s, History: %u, #CTX-ID: %u",
1264 (p[2] & 0xc0) >> 6,
1265 (p[2] & 0x20) ? "Enabled" : "Disabled",
1266 p[2] & 0x1f, p[3]));
1267 break;
1268 case CCPOPT_DEFLATE:
1269 if (len < 4) {
1270 ND_PRINT((ndo, " (length bogus, should be >= 4)"));
1271 return len;
1272 }
1273 ND_TCHECK(p[3]);
1274 ND_PRINT((ndo, ": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u",
1275 (p[2] & 0xf0) >> 4,
1276 ((p[2] & 0x0f) == 8) ? "zlib" : "unknown",
1277 p[2] & 0x0f, (p[3] & 0xfc) >> 2, p[3] & 0x03));
1278 break;
1279
1280 /* XXX: to be supported */
1281 #if 0
1282 case CCPOPT_OUI:
1283 case CCPOPT_PRED1:
1284 case CCPOPT_PRED2:
1285 case CCPOPT_PJUMP:
1286 case CCPOPT_HPPPC:
1287 case CCPOPT_STACLZS:
1288 case CCPOPT_MPPC:
1289 case CCPOPT_GFZA:
1290 case CCPOPT_V42BIS:
1291 case CCPOPT_LZSDCP:
1292 case CCPOPT_DEC:
1293 case CCPOPT_RESV:
1294 break;
1295 #endif
1296 default:
1297 /*
1298 * Unknown option; dump it as raw bytes now if we're
1299 * not going to do so below.
1300 */
1301 if (ndo->ndo_vflag < 2)
1302 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
1303 break;
1304 }
1305 if (ndo->ndo_vflag > 1)
1306 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
1307
1308 return len;
1309
1310 trunc:
1311 ND_PRINT((ndo, "[|ccp]"));
1312 return 0;
1313 }
1314
1315 /* BACP config options */
1316 static int
1317 print_bacp_config_options(netdissect_options *ndo,
1318 const u_char *p, int length)
1319 {
1320 int len, opt;
1321
1322 if (length < 2)
1323 return 0;
1324 ND_TCHECK2(*p, 2);
1325 len = p[1];
1326 opt = p[0];
1327 if (length < len)
1328 return 0;
1329 if (len < 2) {
1330 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1331 tok2str(bacconfopts_values, "Unknown", opt),
1332 opt,
1333 len));
1334 return 0;
1335 }
1336
1337 ND_PRINT((ndo, "\n\t %s Option (0x%02x), length %u",
1338 tok2str(bacconfopts_values, "Unknown", opt),
1339 opt,
1340 len));
1341
1342 switch (opt) {
1343 case BACPOPT_FPEER:
1344 if (len != 6) {
1345 ND_PRINT((ndo, " (length bogus, should be = 6)"));
1346 return len;
1347 }
1348 ND_TCHECK_32BITS(p + 2);
1349 ND_PRINT((ndo, ": Magic-Num 0x%08x", EXTRACT_32BITS(p + 2)));
1350 break;
1351 default:
1352 /*
1353 * Unknown option; dump it as raw bytes now if we're
1354 * not going to do so below.
1355 */
1356 if (ndo->ndo_vflag < 2)
1357 print_unknown_data(ndo, &p[2], "\n\t ", len - 2);
1358 break;
1359 }
1360 if (ndo->ndo_vflag > 1)
1361 print_unknown_data(ndo, &p[2], "\n\t ", len - 2); /* exclude TLV header */
1362
1363 return len;
1364
1365 trunc:
1366 ND_PRINT((ndo, "[|bacp]"));
1367 return 0;
1368 }
1369
1370 static void
1371 ppp_hdlc(netdissect_options *ndo,
1372 const u_char *p, int length)
1373 {
1374 u_char *b, *t, c;
1375 const u_char *s;
1376 int i, proto;
1377 const void *se;
1378
1379 if (length <= 0)
1380 return;
1381
1382 b = (u_char *)malloc(length);
1383 if (b == NULL)
1384 return;
1385
1386 /*
1387 * Unescape all the data into a temporary, private, buffer.
1388 * Do this so that we dont overwrite the original packet
1389 * contents.
1390 */
1391 for (s = p, t = b, i = length; i > 0 && ND_TTEST(*s); i--) {
1392 c = *s++;
1393 if (c == 0x7d) {
1394 if (i <= 1 || !ND_TTEST(*s))
1395 break;
1396 i--;
1397 c = *s++ ^ 0x20;
1398 }
1399 *t++ = c;
1400 }
1401
1402 se = ndo->ndo_snapend;
1403 ndo->ndo_snapend = t;
1404 length = t - b;
1405
1406 /* now lets guess about the payload codepoint format */
1407 if (length < 1)
1408 goto trunc;
1409 proto = *b; /* start with a one-octet codepoint guess */
1410
1411 switch (proto) {
1412 case PPP_IP:
1413 ip_print(ndo, b + 1, length - 1);
1414 goto cleanup;
1415 case PPP_IPV6:
1416 ip6_print(ndo, b + 1, length - 1);
1417 goto cleanup;
1418 default: /* no luck - try next guess */
1419 break;
1420 }
1421
1422 if (length < 2)
1423 goto trunc;
1424 proto = EXTRACT_16BITS(b); /* next guess - load two octets */
1425
1426 switch (proto) {
1427 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */
1428 if (length < 4)
1429 goto trunc;
1430 proto = EXTRACT_16BITS(b+2); /* load the PPP proto-id */
1431 handle_ppp(ndo, proto, b + 4, length - 4);
1432 break;
1433 default: /* last guess - proto must be a PPP proto-id */
1434 handle_ppp(ndo, proto, b + 2, length - 2);
1435 break;
1436 }
1437
1438 cleanup:
1439 ndo->ndo_snapend = se;
1440 free(b);
1441 return;
1442
1443 trunc:
1444 ndo->ndo_snapend = se;
1445 free(b);
1446 ND_PRINT((ndo, "[|ppp]"));
1447 }
1448
1449
1450 /* PPP */
1451 static void
1452 handle_ppp(netdissect_options *ndo,
1453 u_int proto, const u_char *p, int length)
1454 {
1455 if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */
1456 ppp_hdlc(ndo, p - 1, length);
1457 return;
1458 }
1459
1460 switch (proto) {
1461 case PPP_LCP: /* fall through */
1462 case PPP_IPCP:
1463 case PPP_OSICP:
1464 case PPP_MPLSCP:
1465 case PPP_IPV6CP:
1466 case PPP_CCP:
1467 case PPP_BACP:
1468 handle_ctrl_proto(ndo, proto, p, length);
1469 break;
1470 case PPP_ML:
1471 handle_mlppp(ndo, p, length);
1472 break;
1473 case PPP_CHAP:
1474 handle_chap(ndo, p, length);
1475 break;
1476 case PPP_PAP:
1477 handle_pap(ndo, p, length);
1478 break;
1479 case PPP_BAP: /* XXX: not yet completed */
1480 handle_bap(ndo, p, length);
1481 break;
1482 case ETHERTYPE_IP: /*XXX*/
1483 case PPP_VJNC:
1484 case PPP_IP:
1485 ip_print(ndo, p, length);
1486 break;
1487 case ETHERTYPE_IPV6: /*XXX*/
1488 case PPP_IPV6:
1489 ip6_print(ndo, p, length);
1490 break;
1491 case ETHERTYPE_IPX: /*XXX*/
1492 case PPP_IPX:
1493 ipx_print(ndo, p, length);
1494 break;
1495 case PPP_OSI:
1496 isoclns_print(ndo, p, length);
1497 break;
1498 case PPP_MPLS_UCAST:
1499 case PPP_MPLS_MCAST:
1500 mpls_print(ndo, p, length);
1501 break;
1502 case PPP_COMP:
1503 ND_PRINT((ndo, "compressed PPP data"));
1504 break;
1505 default:
1506 ND_PRINT((ndo, "%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)));
1507 print_unknown_data(ndo, p, "\n\t", length);
1508 break;
1509 }
1510 }
1511
1512 /* Standard PPP printer */
1513 u_int
1514 ppp_print(netdissect_options *ndo,
1515 register const u_char *p, u_int length)
1516 {
1517 u_int proto,ppp_header;
1518 u_int olen = length; /* _o_riginal length */
1519 u_int hdr_len = 0;
1520
1521 /*
1522 * Here, we assume that p points to the Address and Control
1523 * field (if they present).
1524 */
1525 if (length < 2)
1526 goto trunc;
1527 ND_TCHECK2(*p, 2);
1528 ppp_header = EXTRACT_16BITS(p);
1529
1530 switch(ppp_header) {
1531 case (PPP_WITHDIRECTION_IN << 8 | PPP_CONTROL):
1532 if (ndo->ndo_eflag) ND_PRINT((ndo, "In "));
1533 p += 2;
1534 length -= 2;
1535 hdr_len += 2;
1536 break;
1537 case (PPP_WITHDIRECTION_OUT << 8 | PPP_CONTROL):
1538 if (ndo->ndo_eflag) ND_PRINT((ndo, "Out "));
1539 p += 2;
1540 length -= 2;
1541 hdr_len += 2;
1542 break;
1543 case (PPP_ADDRESS << 8 | PPP_CONTROL):
1544 p += 2; /* ACFC not used */
1545 length -= 2;
1546 hdr_len += 2;
1547 break;
1548
1549 default:
1550 break;
1551 }
1552
1553 if (length < 2)
1554 goto trunc;
1555 ND_TCHECK(*p);
1556 if (*p % 2) {
1557 proto = *p; /* PFC is used */
1558 p++;
1559 length--;
1560 hdr_len++;
1561 } else {
1562 ND_TCHECK2(*p, 2);
1563 proto = EXTRACT_16BITS(p);
1564 p += 2;
1565 length -= 2;
1566 hdr_len += 2;
1567 }
1568
1569 if (ndo->ndo_eflag)
1570 ND_PRINT((ndo, "%s (0x%04x), length %u: ",
1571 tok2str(ppptype2str, "unknown", proto),
1572 proto,
1573 olen));
1574
1575 handle_ppp(ndo, proto, p, length);
1576 return (hdr_len);
1577 trunc:
1578 ND_PRINT((ndo, "[|ppp]"));
1579 return (0);
1580 }
1581
1582
1583 /* PPP I/F printer */
1584 u_int
1585 ppp_if_print(netdissect_options *ndo,
1586 const struct pcap_pkthdr *h, register const u_char *p)
1587 {
1588 register u_int length = h->len;
1589 register u_int caplen = h->caplen;
1590
1591 if (caplen < PPP_HDRLEN) {
1592 ND_PRINT((ndo, "[|ppp]"));
1593 return (caplen);
1594 }
1595
1596 #if 0
1597 /*
1598 * XXX: seems to assume that there are 2 octets prepended to an
1599 * actual PPP frame. The 1st octet looks like Input/Output flag
1600 * while 2nd octet is unknown, at least to me
1601 * (mshindo@mshindo.net).
1602 *
1603 * That was what the original tcpdump code did.
1604 *
1605 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1606 * packets and 0 for inbound packets - but only if the
1607 * protocol field has the 0x8000 bit set (i.e., it's a network
1608 * control protocol); it does so before running the packet through
1609 * "bpf_filter" to see if it should be discarded, and to see
1610 * if we should update the time we sent the most recent packet...
1611 *
1612 * ...but it puts the original address field back after doing
1613 * so.
1614 *
1615 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1616 *
1617 * I don't know if any PPP implementation handed up to a BPF
1618 * device packets with the first octet being 1 for outbound and
1619 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1620 * whether that ever needs to be checked or not.
1621 *
1622 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1623 * and its tcpdump appears to assume that the frame always
1624 * begins with an address field and a control field, and that
1625 * the address field might be 0x0f or 0x8f, for Cisco
1626 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1627 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1628 * RFC 1662.
1629 *
1630 * (Is the Cisco framing in question what DLT_C_HDLC, in
1631 * BSD/OS, is?)
1632 */
1633 if (ndo->ndo_eflag)
1634 ND_PRINT((ndo, "%c %4d %02x ", p[0] ? 'O' : 'I', length, p[1]));
1635 #endif
1636
1637 ppp_print(ndo, p, length);
1638
1639 return (0);
1640 }
1641
1642 /*
1643 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1644 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1645 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1646 * discard them *if* those are the first two octets, and parse the remaining
1647 * packet as a PPP packet, as "ppp_print()" does).
1648 *
1649 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1650 */
1651 u_int
1652 ppp_hdlc_if_print(netdissect_options *ndo,
1653 const struct pcap_pkthdr *h, register const u_char *p)
1654 {
1655 register u_int length = h->len;
1656 register u_int caplen = h->caplen;
1657 u_int proto;
1658 u_int hdrlen = 0;
1659
1660 if (caplen < 2) {
1661 ND_PRINT((ndo, "[|ppp]"));
1662 return (caplen);
1663 }
1664
1665 switch (p[0]) {
1666
1667 case PPP_ADDRESS:
1668 if (caplen < 4) {
1669 ND_PRINT((ndo, "[|ppp]"));
1670 return (caplen);
1671 }
1672
1673 if (ndo->ndo_eflag)
1674 ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length));
1675 p += 2;
1676 length -= 2;
1677 hdrlen += 2;
1678
1679 proto = EXTRACT_16BITS(p);
1680 p += 2;
1681 length -= 2;
1682 hdrlen += 2;
1683 ND_PRINT((ndo, "%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto)));
1684
1685 handle_ppp(ndo, proto, p, length);
1686 break;
1687
1688 case CHDLC_UNICAST:
1689 case CHDLC_BCAST:
1690 return (chdlc_if_print(ndo, h, p));
1691
1692 default:
1693 if (caplen < 4) {
1694 ND_PRINT((ndo, "[|ppp]"));
1695 return (caplen);
1696 }
1697
1698 if (ndo->ndo_eflag)
1699 ND_PRINT((ndo, "%02x %02x %d ", p[0], p[1], length));
1700 p += 2;
1701 hdrlen += 2;
1702
1703 /*
1704 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1705 * the next two octets as an Ethernet type; does that
1706 * ever happen?
1707 */
1708 ND_PRINT((ndo, "unknown addr %02x; ctrl %02x", p[0], p[1]));
1709 break;
1710 }
1711
1712 return (hdrlen);
1713 }
1714
1715 #define PPP_BSDI_HDRLEN 24
1716
1717 /* BSD/OS specific PPP printer */
1718 u_int
1719 ppp_bsdos_if_print(netdissect_options *ndo _U_,
1720 const struct pcap_pkthdr *h _U_, register const u_char *p _U_)
1721 {
1722 register int hdrlength;
1723 #ifdef __bsdi__
1724 register u_int length = h->len;
1725 register u_int caplen = h->caplen;
1726 uint16_t ptype;
1727 const u_char *q;
1728 int i;
1729
1730 if (caplen < PPP_BSDI_HDRLEN) {
1731 ND_PRINT((ndo, "[|ppp]"));
1732 return (caplen)
1733 }
1734
1735 hdrlength = 0;
1736
1737 #if 0
1738 if (p[0] == PPP_ADDRESS && p[1] == PPP_CONTROL) {
1739 if (ndo->ndo_eflag)
1740 ND_PRINT((ndo, "%02x %02x ", p[0], p[1]));
1741 p += 2;
1742 hdrlength = 2;
1743 }
1744
1745 if (ndo->ndo_eflag)
1746 ND_PRINT((ndo, "%d ", length));
1747 /* Retrieve the protocol type */
1748 if (*p & 01) {
1749 /* Compressed protocol field */
1750 ptype = *p;
1751 if (ndo->ndo_eflag)
1752 ND_PRINT((ndo, "%02x ", ptype));
1753 p++;
1754 hdrlength += 1;
1755 } else {
1756 /* Un-compressed protocol field */
1757 ptype = EXTRACT_16BITS(p);
1758 if (ndo->ndo_eflag)
1759 ND_PRINT((ndo, "%04x ", ptype));
1760 p += 2;
1761 hdrlength += 2;
1762 }
1763 #else
1764 ptype = 0; /*XXX*/
1765 if (ndo->ndo_eflag)
1766 ND_PRINT((ndo, "%c ", p[SLC_DIR] ? 'O' : 'I'));
1767 if (p[SLC_LLHL]) {
1768 /* link level header */
1769 struct ppp_header *ph;
1770
1771 q = p + SLC_BPFHDRLEN;
1772 ph = (struct ppp_header *)q;
1773 if (ph->phdr_addr == PPP_ADDRESS
1774 && ph->phdr_ctl == PPP_CONTROL) {
1775 if (ndo->ndo_eflag)
1776 ND_PRINT((ndo, "%02x %02x ", q[0], q[1]));
1777 ptype = EXTRACT_16BITS(&ph->phdr_type);
1778 if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1779 ND_PRINT((ndo, "%s ", tok2str(ppptype2str,
1780 "proto-#%d", ptype)));
1781 }
1782 } else {
1783 if (ndo->ndo_eflag) {
1784 ND_PRINT((ndo, "LLH=["));
1785 for (i = 0; i < p[SLC_LLHL]; i++)
1786 ND_PRINT((ndo, "%02x", q[i]));
1787 ND_PRINT((ndo, "] "));
1788 }
1789 }
1790 }
1791 if (ndo->ndo_eflag)
1792 ND_PRINT((ndo, "%d ", length));
1793 if (p[SLC_CHL]) {
1794 q = p + SLC_BPFHDRLEN + p[SLC_LLHL];
1795
1796 switch (ptype) {
1797 case PPP_VJC:
1798 ptype = vjc_print(ndo, q, ptype);
1799 hdrlength = PPP_BSDI_HDRLEN;
1800 p += hdrlength;
1801 switch (ptype) {
1802 case PPP_IP:
1803 ip_print(ndo, p, length);
1804 break;
1805 case PPP_IPV6:
1806 ip6_print(ndo, p, length);
1807 break;
1808 case PPP_MPLS_UCAST:
1809 case PPP_MPLS_MCAST:
1810 mpls_print(ndo, p, length);
1811 break;
1812 }
1813 goto printx;
1814 case PPP_VJNC:
1815 ptype = vjc_print(ndo, q, ptype);
1816 hdrlength = PPP_BSDI_HDRLEN;
1817 p += hdrlength;
1818 switch (ptype) {
1819 case PPP_IP:
1820 ip_print(ndo, p, length);
1821 break;
1822 case PPP_IPV6:
1823 ip6_print(ndo, p, length);
1824 break;
1825 case PPP_MPLS_UCAST:
1826 case PPP_MPLS_MCAST:
1827 mpls_print(ndo, p, length);
1828 break;
1829 }
1830 goto printx;
1831 default:
1832 if (ndo->ndo_eflag) {
1833 ND_PRINT((ndo, "CH=["));
1834 for (i = 0; i < p[SLC_LLHL]; i++)
1835 ND_PRINT((ndo, "%02x", q[i]));
1836 ND_PRINT((ndo, "] "));
1837 }
1838 break;
1839 }
1840 }
1841
1842 hdrlength = PPP_BSDI_HDRLEN;
1843 #endif
1844
1845 length -= hdrlength;
1846 p += hdrlength;
1847
1848 switch (ptype) {
1849 case PPP_IP:
1850 ip_print(p, length);
1851 break;
1852 case PPP_IPV6:
1853 ip6_print(ndo, p, length);
1854 break;
1855 case PPP_MPLS_UCAST:
1856 case PPP_MPLS_MCAST:
1857 mpls_print(ndo, p, length);
1858 break;
1859 default:
1860 ND_PRINT((ndo, "%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype)));
1861 }
1862
1863 printx:
1864 #else /* __bsdi */
1865 hdrlength = 0;
1866 #endif /* __bsdi__ */
1867 return (hdrlength);
1868 }
1869
1870
1871 /*
1872 * Local Variables:
1873 * c-style: whitesmith
1874 * c-basic-offset: 8
1875 * End:
1876 */
Unleashed OS