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IGMP: Remove all remaining ND_TCHECK*() cases.
[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 * https://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 tlen, advance;
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 = GET_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 GET_U_1(tptr), /* ID */
439 length + 2);
440 tptr++;
441
442 if (!ndo->ndo_vflag)
443 return;
444
445 len = GET_BE_U_2(tptr);
446 tptr += 2;
447
448 if (len < 4) {
449 ND_PRINT("\n\tencoded length %u (< 4))", len);
450 return;
451 }
452
453 if (len > length) {
454 ND_PRINT("\n\tencoded length %u (> packet length %u))", len, length);
455 return;
456 }
457 length = len;
458
459 ND_PRINT("\n\tencoded length %u (=Option(s) length %u)", len, len - 4);
460
461 if (length == 4)
462 return; /* there may be a NULL confreq etc. */
463
464 if (ndo->ndo_vflag > 1)
465 print_unknown_data(ndo, pptr - 2, "\n\t", 6);
466
467
468 switch (code) {
469 case CPCODES_VEXT:
470 if (length < 11)
471 break;
472 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr));
473 tptr += 4;
474 ND_PRINT(" Vendor: %s (%u)",
475 tok2str(oui_values,"Unknown",GET_BE_U_3(tptr)),
476 GET_BE_U_3(tptr));
477 /* XXX: need to decode Kind and Value(s)? */
478 break;
479 case CPCODES_CONF_REQ:
480 case CPCODES_CONF_ACK:
481 case CPCODES_CONF_NAK:
482 case CPCODES_CONF_REJ:
483 tlen = len - 4; /* Code(1), Identifier(1) and Length(2) */
484 do {
485 switch (proto) {
486 case PPP_LCP:
487 pfunc = print_lcp_config_options;
488 break;
489 case PPP_IPCP:
490 pfunc = print_ipcp_config_options;
491 break;
492 case PPP_IPV6CP:
493 pfunc = print_ip6cp_config_options;
494 break;
495 case PPP_CCP:
496 pfunc = print_ccp_config_options;
497 break;
498 case PPP_BACP:
499 pfunc = print_bacp_config_options;
500 break;
501 default:
502 /*
503 * No print routine for the options for
504 * this protocol.
505 */
506 pfunc = NULL;
507 break;
508 }
509
510 if (pfunc == NULL) /* catch the above null pointer if unknown CP */
511 break;
512
513 if ((advance = (*pfunc)(ndo, tptr, len)) == 0)
514 break;
515 if (tlen < advance) {
516 ND_PRINT(" [remaining options length %u < %u]",
517 tlen, advance);
518 nd_print_invalid(ndo);
519 break;
520 }
521 tlen -= advance;
522 tptr += advance;
523 } while (tlen != 0);
524 break;
525
526 case CPCODES_TERM_REQ:
527 case CPCODES_TERM_ACK:
528 /* XXX: need to decode Data? */
529 break;
530 case CPCODES_CODE_REJ:
531 /* XXX: need to decode Rejected-Packet? */
532 break;
533 case CPCODES_PROT_REJ:
534 if (length < 6)
535 break;
536 ND_PRINT("\n\t Rejected %s Protocol (0x%04x)",
537 tok2str(ppptype2str,"unknown", GET_BE_U_2(tptr)),
538 GET_BE_U_2(tptr));
539 /* XXX: need to decode Rejected-Information? - hexdump for now */
540 if (len > 6) {
541 ND_PRINT("\n\t Rejected Packet");
542 print_unknown_data(ndo, tptr + 2, "\n\t ", len - 2);
543 }
544 break;
545 case CPCODES_ECHO_REQ:
546 case CPCODES_ECHO_RPL:
547 case CPCODES_DISC_REQ:
548 if (length < 8)
549 break;
550 ND_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr));
551 /* XXX: need to decode Data? - hexdump for now */
552 if (len > 8) {
553 ND_PRINT("\n\t -----trailing data-----");
554 ND_TCHECK_LEN(tptr + 4, len - 8);
555 print_unknown_data(ndo, tptr + 4, "\n\t ", len - 8);
556 }
557 break;
558 case CPCODES_ID:
559 if (length < 8)
560 break;
561 ND_PRINT("\n\t Magic-Num 0x%08x", GET_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 (nd_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_PRINT("\n\t Magic-Num 0x%08x", GET_BE_U_4(tptr));
573 ND_PRINT(", Seconds-Remaining %us", GET_BE_U_4(tptr + 4));
574 /* XXX: need to decode Message? */
575 break;
576 default:
577 /* XXX this is dirty but we do not get the
578 * original pointer passed to the begin
579 * the PPP packet */
580 if (ndo->ndo_vflag <= 1)
581 print_unknown_data(ndo, pptr - 2, "\n\t ", length + 2);
582 break;
583 }
584 return;
585
586 trunc:
587 ND_PRINT("[|%s]", typestr);
588 }
589
590 /* LCP config options */
591 static u_int
592 print_lcp_config_options(netdissect_options *ndo,
593 const u_char *p, u_int length)
594 {
595 u_int opt, len;
596
597 if (length < 2)
598 return 0;
599 ND_TCHECK_2(p);
600 opt = GET_U_1(p);
601 len = GET_U_1(p + 1);
602 if (length < len)
603 return 0;
604 if (len < 2) {
605 if (opt < NUM_LCPOPTS)
606 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
607 lcpconfopts[opt], opt, len);
608 else
609 ND_PRINT("\n\tunknown LCP option 0x%02x", opt);
610 return 0;
611 }
612 if (opt < NUM_LCPOPTS)
613 ND_PRINT("\n\t %s Option (0x%02x), length %u", lcpconfopts[opt], opt, len);
614 else {
615 ND_PRINT("\n\tunknown LCP option 0x%02x", opt);
616 return len;
617 }
618
619 switch (opt) {
620 case LCPOPT_VEXT:
621 if (len < 6) {
622 ND_PRINT(" (length bogus, should be >= 6)");
623 return len;
624 }
625 ND_PRINT(": Vendor: %s (%u)",
626 tok2str(oui_values,"Unknown",GET_BE_U_3(p + 2)),
627 GET_BE_U_3(p + 2));
628 #if 0
629 ND_PRINT(", kind: 0x%02x", GET_U_1(p + 5));
630 ND_PRINT(", Value: 0x");
631 for (i = 0; i < len - 6; i++) {
632 ND_PRINT("%02x", GET_U_1(p + 6 + i));
633 }
634 #endif
635 break;
636 case LCPOPT_MRU:
637 if (len != 4) {
638 ND_PRINT(" (length bogus, should be = 4)");
639 return len;
640 }
641 ND_PRINT(": %u", GET_BE_U_2(p + 2));
642 break;
643 case LCPOPT_ACCM:
644 if (len != 6) {
645 ND_PRINT(" (length bogus, should be = 6)");
646 return len;
647 }
648 ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2));
649 break;
650 case LCPOPT_AP:
651 if (len < 4) {
652 ND_PRINT(" (length bogus, should be >= 4)");
653 return len;
654 }
655 ND_PRINT(": %s",
656 tok2str(ppptype2str, "Unknown Auth Proto (0x04x)", GET_BE_U_2(p + 2)));
657
658 switch (GET_BE_U_2(p + 2)) {
659 case PPP_CHAP:
660 ND_PRINT(", %s",
661 tok2str(authalg_values, "Unknown Auth Alg %u", GET_U_1(p + 4)));
662 break;
663 case PPP_PAP: /* fall through */
664 case PPP_EAP:
665 case PPP_SPAP:
666 case PPP_SPAP_OLD:
667 break;
668 default:
669 print_unknown_data(ndo, p, "\n\t", len);
670 }
671 break;
672 case LCPOPT_QP:
673 if (len < 4) {
674 ND_PRINT(" (length bogus, should be >= 4)");
675 return 0;
676 }
677 if (GET_BE_U_2(p + 2) == PPP_LQM)
678 ND_PRINT(": LQR");
679 else
680 ND_PRINT(": unknown");
681 break;
682 case LCPOPT_MN:
683 if (len != 6) {
684 ND_PRINT(" (length bogus, should be = 6)");
685 return 0;
686 }
687 ND_PRINT(": 0x%08x", GET_BE_U_4(p + 2));
688 break;
689 case LCPOPT_PFC:
690 break;
691 case LCPOPT_ACFC:
692 break;
693 case LCPOPT_LD:
694 if (len != 4) {
695 ND_PRINT(" (length bogus, should be = 4)");
696 return 0;
697 }
698 ND_PRINT(": 0x%04x", GET_BE_U_2(p + 2));
699 break;
700 case LCPOPT_CBACK:
701 if (len < 3) {
702 ND_PRINT(" (length bogus, should be >= 3)");
703 return 0;
704 }
705 ND_PRINT(": ");
706 ND_PRINT(": Callback Operation %s (%u)",
707 tok2str(ppp_callback_values, "Unknown", GET_U_1(p + 2)),
708 GET_U_1(p + 2));
709 break;
710 case LCPOPT_MLMRRU:
711 if (len != 4) {
712 ND_PRINT(" (length bogus, should be = 4)");
713 return 0;
714 }
715 ND_PRINT(": %u", GET_BE_U_2(p + 2));
716 break;
717 case LCPOPT_MLED:
718 if (len < 3) {
719 ND_PRINT(" (length bogus, should be >= 3)");
720 return 0;
721 }
722 switch (GET_U_1(p + 2)) { /* class */
723 case MEDCLASS_NULL:
724 ND_PRINT(": Null");
725 break;
726 case MEDCLASS_LOCAL:
727 ND_PRINT(": Local"); /* XXX */
728 break;
729 case MEDCLASS_IPV4:
730 if (len != 7) {
731 ND_PRINT(" (length bogus, should be = 7)");
732 return 0;
733 }
734 ND_PRINT(": IPv4 %s", GET_IPADDR_STRING(p + 3));
735 break;
736 case MEDCLASS_MAC:
737 if (len != 9) {
738 ND_PRINT(" (length bogus, should be = 9)");
739 return 0;
740 }
741 ND_PRINT(": MAC %s", GET_ETHERADDR_STRING(p + 3));
742 break;
743 case MEDCLASS_MNB:
744 ND_PRINT(": Magic-Num-Block"); /* XXX */
745 break;
746 case MEDCLASS_PSNDN:
747 ND_PRINT(": PSNDN"); /* XXX */
748 break;
749 default:
750 ND_PRINT(": Unknown class %u", GET_U_1(p + 2));
751 break;
752 }
753 break;
754
755 /* XXX: to be supported */
756 #if 0
757 case LCPOPT_DEP6:
758 case LCPOPT_FCSALT:
759 case LCPOPT_SDP:
760 case LCPOPT_NUMMODE:
761 case LCPOPT_DEP12:
762 case LCPOPT_DEP14:
763 case LCPOPT_DEP15:
764 case LCPOPT_DEP16:
765 case LCPOPT_MLSSNHF:
766 case LCPOPT_PROP:
767 case LCPOPT_DCEID:
768 case LCPOPT_MPP:
769 case LCPOPT_LCPAOPT:
770 case LCPOPT_COBS:
771 case LCPOPT_PE:
772 case LCPOPT_MLHF:
773 case LCPOPT_I18N:
774 case LCPOPT_SDLOS:
775 case LCPOPT_PPPMUX:
776 break;
777 #endif
778 default:
779 /*
780 * Unknown option; dump it as raw bytes now if we're
781 * not going to do so below.
782 */
783 if (ndo->ndo_vflag < 2)
784 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
785 break;
786 }
787
788 if (ndo->ndo_vflag > 1)
789 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
790
791 return len;
792
793 trunc:
794 ND_PRINT("[|lcp]");
795 return 0;
796 }
797
798 /* ML-PPP*/
799 static const struct tok ppp_ml_flag_values[] = {
800 { 0x80, "begin" },
801 { 0x40, "end" },
802 { 0, NULL }
803 };
804
805 static void
806 handle_mlppp(netdissect_options *ndo,
807 const u_char *p, u_int length)
808 {
809 if (!ndo->ndo_eflag)
810 ND_PRINT("MLPPP, ");
811
812 if (length < 2) {
813 ND_PRINT("[|mlppp]");
814 return;
815 }
816 if (!ND_TTEST_2(p)) {
817 ND_PRINT("[|mlppp]");
818 return;
819 }
820
821 ND_PRINT("seq 0x%03x, Flags [%s], length %u",
822 (GET_BE_U_2(p))&0x0fff,
823 /* only support 12-Bit sequence space for now */
824 bittok2str(ppp_ml_flag_values, "none", GET_U_1(p) & 0xc0),
825 length);
826 }
827
828 /* CHAP */
829 static void
830 handle_chap(netdissect_options *ndo,
831 const u_char *p, u_int length)
832 {
833 u_int code, len;
834 u_int val_size, name_size, msg_size;
835 const u_char *p0;
836 u_int i;
837
838 p0 = p;
839 if (length < 1) {
840 ND_PRINT("[|chap]");
841 return;
842 } else if (length < 4) {
843 ND_PRINT("[|chap 0x%02x]", GET_U_1(p));
844 return;
845 }
846
847 code = GET_U_1(p);
848 ND_PRINT("CHAP, %s (0x%02x)",
849 tok2str(chapcode_values,"unknown",code),
850 code);
851 p++;
852
853 ND_PRINT(", id %u", GET_U_1(p)); /* ID */
854 p++;
855
856 len = GET_BE_U_2(p);
857 p += 2;
858
859 /*
860 * Note that this is a generic CHAP decoding routine. Since we
861 * don't know which flavor of CHAP (i.e. CHAP-MD5, MS-CHAPv1,
862 * MS-CHAPv2) is used at this point, we can't decode packet
863 * specifically to each algorithms. Instead, we simply decode
864 * the GCD (Gratest Common Denominator) for all algorithms.
865 */
866 switch (code) {
867 case CHAP_CHAL:
868 case CHAP_RESP:
869 if (length - (p - p0) < 1)
870 return;
871 val_size = GET_U_1(p); /* value size */
872 p++;
873 if (length - (p - p0) < val_size)
874 return;
875 ND_PRINT(", Value ");
876 for (i = 0; i < val_size; i++) {
877 ND_PRINT("%02x", GET_U_1(p));
878 p++;
879 }
880 name_size = len - (u_int)(p - p0);
881 ND_PRINT(", Name ");
882 for (i = 0; i < name_size; i++) {
883 fn_print_char(ndo, GET_U_1(p));
884 p++;
885 }
886 break;
887 case CHAP_SUCC:
888 case CHAP_FAIL:
889 msg_size = len - (u_int)(p - p0);
890 ND_PRINT(", Msg ");
891 for (i = 0; i< msg_size; i++) {
892 fn_print_char(ndo, GET_U_1(p));
893 p++;
894 }
895 break;
896 }
897 }
898
899 /* PAP (see RFC 1334) */
900 static void
901 handle_pap(netdissect_options *ndo,
902 const u_char *p, u_int length)
903 {
904 u_int code, len;
905 u_int peerid_len, passwd_len, msg_len;
906 const u_char *p0;
907 u_int i;
908
909 p0 = p;
910 if (length < 1) {
911 ND_PRINT("[|pap]");
912 return;
913 } else if (length < 4) {
914 ND_PRINT("[|pap 0x%02x]", GET_U_1(p));
915 return;
916 }
917
918 code = GET_U_1(p);
919 ND_PRINT("PAP, %s (0x%02x)",
920 tok2str(papcode_values, "unknown", code),
921 code);
922 p++;
923
924 ND_PRINT(", id %u", GET_U_1(p)); /* ID */
925 p++;
926
927 len = GET_BE_U_2(p);
928 p += 2;
929
930 if (len > length) {
931 ND_PRINT(", length %u > packet size", len);
932 return;
933 }
934 length = len;
935 if (length < (size_t)(p - p0)) {
936 ND_PRINT(", length %u < PAP header length", length);
937 return;
938 }
939
940 switch (code) {
941 case PAP_AREQ:
942 /* A valid Authenticate-Request is 6 or more octets long. */
943 if (len < 6)
944 goto trunc;
945 if (length - (p - p0) < 1)
946 return;
947 peerid_len = GET_U_1(p); /* Peer-ID Length */
948 p++;
949 if (length - (p - p0) < peerid_len)
950 return;
951 ND_PRINT(", Peer ");
952 for (i = 0; i < peerid_len; i++) {
953 fn_print_char(ndo, GET_U_1(p));
954 p++;
955 }
956
957 if (length - (p - p0) < 1)
958 return;
959 passwd_len = GET_U_1(p); /* Password Length */
960 p++;
961 if (length - (p - p0) < passwd_len)
962 return;
963 ND_PRINT(", Name ");
964 for (i = 0; i < passwd_len; i++) {
965 fn_print_char(ndo, GET_U_1(p));
966 p++;
967 }
968 break;
969 case PAP_AACK:
970 case PAP_ANAK:
971 /* Although some implementations ignore truncation at
972 * this point and at least one generates a truncated
973 * packet, RFC 1334 section 2.2.2 clearly states that
974 * both AACK and ANAK are at least 5 bytes long.
975 */
976 if (len < 5)
977 goto trunc;
978 if (length - (p - p0) < 1)
979 return;
980 msg_len = GET_U_1(p); /* Msg-Length */
981 p++;
982 if (length - (p - p0) < msg_len)
983 return;
984 ND_PRINT(", Msg ");
985 for (i = 0; i< msg_len; i++) {
986 fn_print_char(ndo, GET_U_1(p));
987 p++;
988 }
989 break;
990 }
991 return;
992
993 trunc:
994 ND_PRINT("[|pap]");
995 }
996
997 /* BAP */
998 static void
999 handle_bap(netdissect_options *ndo _U_,
1000 const u_char *p _U_, u_int length _U_)
1001 {
1002 /* XXX: to be supported!! */
1003 }
1004
1005
1006 /* IPCP config options */
1007 static u_int
1008 print_ipcp_config_options(netdissect_options *ndo,
1009 const u_char *p, u_int length)
1010 {
1011 u_int opt, len;
1012 u_int compproto, ipcomp_subopttotallen, ipcomp_subopt, ipcomp_suboptlen;
1013
1014 if (length < 2)
1015 return 0;
1016 ND_TCHECK_2(p);
1017 opt = GET_U_1(p);
1018 len = GET_U_1(p + 1);
1019 if (length < len)
1020 return 0;
1021 if (len < 2) {
1022 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1023 tok2str(ipcpopt_values,"unknown",opt),
1024 opt,
1025 len);
1026 return 0;
1027 }
1028
1029 ND_PRINT("\n\t %s Option (0x%02x), length %u",
1030 tok2str(ipcpopt_values,"unknown",opt),
1031 opt,
1032 len);
1033
1034 switch (opt) {
1035 case IPCPOPT_2ADDR: /* deprecated */
1036 if (len != 10) {
1037 ND_PRINT(" (length bogus, should be = 10)");
1038 return len;
1039 }
1040 ND_PRINT(": src %s, dst %s",
1041 GET_IPADDR_STRING(p + 2),
1042 GET_IPADDR_STRING(p + 6));
1043 break;
1044 case IPCPOPT_IPCOMP:
1045 if (len < 4) {
1046 ND_PRINT(" (length bogus, should be >= 4)");
1047 return 0;
1048 }
1049 compproto = GET_BE_U_2(p + 2);
1050
1051 ND_PRINT(": %s (0x%02x):",
1052 tok2str(ipcpopt_compproto_values, "Unknown", compproto),
1053 compproto);
1054
1055 switch (compproto) {
1056 case PPP_VJC:
1057 /* XXX: VJ-Comp parameters should be decoded */
1058 break;
1059 case IPCPOPT_IPCOMP_HDRCOMP:
1060 if (len < IPCPOPT_IPCOMP_MINLEN) {
1061 ND_PRINT(" (length bogus, should be >= %u)",
1062 IPCPOPT_IPCOMP_MINLEN);
1063 return 0;
1064 }
1065
1066 ND_TCHECK_LEN(p + 2, IPCPOPT_IPCOMP_MINLEN);
1067 ND_PRINT("\n\t TCP Space %u, non-TCP Space %u"
1068 ", maxPeriod %u, maxTime %u, maxHdr %u",
1069 GET_BE_U_2(p + 4),
1070 GET_BE_U_2(p + 6),
1071 GET_BE_U_2(p + 8),
1072 GET_BE_U_2(p + 10),
1073 GET_BE_U_2(p + 12));
1074
1075 /* suboptions present ? */
1076 if (len > IPCPOPT_IPCOMP_MINLEN) {
1077 ipcomp_subopttotallen = len - IPCPOPT_IPCOMP_MINLEN;
1078 p += IPCPOPT_IPCOMP_MINLEN;
1079
1080 ND_PRINT("\n\t Suboptions, length %u", ipcomp_subopttotallen);
1081
1082 while (ipcomp_subopttotallen >= 2) {
1083 ND_TCHECK_2(p);
1084 ipcomp_subopt = GET_U_1(p);
1085 ipcomp_suboptlen = GET_U_1(p + 1);
1086
1087 /* sanity check */
1088 if (ipcomp_subopt == 0 ||
1089 ipcomp_suboptlen == 0 )
1090 break;
1091
1092 /* XXX: just display the suboptions for now */
1093 ND_PRINT("\n\t\t%s Suboption #%u, length %u",
1094 tok2str(ipcpopt_compproto_subopt_values,
1095 "Unknown",
1096 ipcomp_subopt),
1097 ipcomp_subopt,
1098 ipcomp_suboptlen);
1099 if (ipcomp_subopttotallen < ipcomp_suboptlen) {
1100 ND_PRINT(" [remaining suboptions length %u < %u]",
1101 ipcomp_subopttotallen, ipcomp_suboptlen);
1102 nd_print_invalid(ndo);
1103 break;
1104 }
1105 ipcomp_subopttotallen -= ipcomp_suboptlen;
1106 p += ipcomp_suboptlen;
1107 }
1108 }
1109 break;
1110 default:
1111 break;
1112 }
1113 break;
1114
1115 case IPCPOPT_ADDR: /* those options share the same format - fall through */
1116 case IPCPOPT_MOBILE4:
1117 case IPCPOPT_PRIDNS:
1118 case IPCPOPT_PRINBNS:
1119 case IPCPOPT_SECDNS:
1120 case IPCPOPT_SECNBNS:
1121 if (len != 6) {
1122 ND_PRINT(" (length bogus, should be = 6)");
1123 return 0;
1124 }
1125 ND_PRINT(": %s", GET_IPADDR_STRING(p + 2));
1126 break;
1127 default:
1128 /*
1129 * Unknown option; dump it as raw bytes now if we're
1130 * not going to do so below.
1131 */
1132 if (ndo->ndo_vflag < 2)
1133 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
1134 break;
1135 }
1136 if (ndo->ndo_vflag > 1)
1137 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
1138 return len;
1139
1140 trunc:
1141 ND_PRINT("[|ipcp]");
1142 return 0;
1143 }
1144
1145 /* IP6CP config options */
1146 static u_int
1147 print_ip6cp_config_options(netdissect_options *ndo,
1148 const u_char *p, u_int length)
1149 {
1150 u_int opt, len;
1151
1152 if (length < 2)
1153 return 0;
1154 ND_TCHECK_2(p);
1155 opt = GET_U_1(p);
1156 len = GET_U_1(p + 1);
1157 if (length < len)
1158 return 0;
1159 if (len < 2) {
1160 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1161 tok2str(ip6cpopt_values,"unknown",opt),
1162 opt,
1163 len);
1164 return 0;
1165 }
1166
1167 ND_PRINT("\n\t %s Option (0x%02x), length %u",
1168 tok2str(ip6cpopt_values,"unknown",opt),
1169 opt,
1170 len);
1171
1172 switch (opt) {
1173 case IP6CP_IFID:
1174 if (len != 10) {
1175 ND_PRINT(" (length bogus, should be = 10)");
1176 return len;
1177 }
1178 ND_TCHECK_8(p + 2);
1179 ND_PRINT(": %04x:%04x:%04x:%04x",
1180 GET_BE_U_2(p + 2),
1181 GET_BE_U_2(p + 4),
1182 GET_BE_U_2(p + 6),
1183 GET_BE_U_2(p + 8));
1184 break;
1185 default:
1186 /*
1187 * Unknown option; dump it as raw bytes now if we're
1188 * not going to do so below.
1189 */
1190 if (ndo->ndo_vflag < 2)
1191 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
1192 break;
1193 }
1194 if (ndo->ndo_vflag > 1)
1195 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
1196
1197 return len;
1198
1199 trunc:
1200 ND_PRINT("[|ip6cp]");
1201 return 0;
1202 }
1203
1204
1205 /* CCP config options */
1206 static u_int
1207 print_ccp_config_options(netdissect_options *ndo,
1208 const u_char *p, u_int length)
1209 {
1210 u_int opt, len;
1211
1212 if (length < 2)
1213 return 0;
1214 ND_TCHECK_2(p);
1215 opt = GET_U_1(p);
1216 len = GET_U_1(p + 1);
1217 if (length < len)
1218 return 0;
1219 if (len < 2) {
1220 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1221 tok2str(ccpconfopts_values, "Unknown", opt),
1222 opt,
1223 len);
1224 return 0;
1225 }
1226
1227 ND_PRINT("\n\t %s Option (0x%02x), length %u",
1228 tok2str(ccpconfopts_values, "Unknown", opt),
1229 opt,
1230 len);
1231
1232 switch (opt) {
1233 case CCPOPT_BSDCOMP:
1234 if (len < 3) {
1235 ND_PRINT(" (length bogus, should be >= 3)");
1236 return len;
1237 }
1238 ND_PRINT(": Version: %u, Dictionary Bits: %u",
1239 GET_U_1(p + 2) >> 5,
1240 GET_U_1(p + 2) & 0x1f);
1241 break;
1242 case CCPOPT_MVRCA:
1243 if (len < 4) {
1244 ND_PRINT(" (length bogus, should be >= 4)");
1245 return len;
1246 }
1247 ND_PRINT(": Features: %u, PxP: %s, History: %u, #CTX-ID: %u",
1248 (GET_U_1(p + 2) & 0xc0) >> 6,
1249 (GET_U_1(p + 2) & 0x20) ? "Enabled" : "Disabled",
1250 GET_U_1(p + 2) & 0x1f,
1251 GET_U_1(p + 3));
1252 break;
1253 case CCPOPT_DEFLATE:
1254 if (len < 4) {
1255 ND_PRINT(" (length bogus, should be >= 4)");
1256 return len;
1257 }
1258 ND_PRINT(": Window: %uK, Method: %s (0x%x), MBZ: %u, CHK: %u",
1259 (GET_U_1(p + 2) & 0xf0) >> 4,
1260 ((GET_U_1(p + 2) & 0x0f) == 8) ? "zlib" : "unknown",
1261 GET_U_1(p + 2) & 0x0f,
1262 (GET_U_1(p + 3) & 0xfc) >> 2,
1263 GET_U_1(p + 3) & 0x03);
1264 break;
1265
1266 /* XXX: to be supported */
1267 #if 0
1268 case CCPOPT_OUI:
1269 case CCPOPT_PRED1:
1270 case CCPOPT_PRED2:
1271 case CCPOPT_PJUMP:
1272 case CCPOPT_HPPPC:
1273 case CCPOPT_STACLZS:
1274 case CCPOPT_MPPC:
1275 case CCPOPT_GFZA:
1276 case CCPOPT_V42BIS:
1277 case CCPOPT_LZSDCP:
1278 case CCPOPT_DEC:
1279 case CCPOPT_RESV:
1280 break;
1281 #endif
1282 default:
1283 /*
1284 * Unknown option; dump it as raw bytes now if we're
1285 * not going to do so below.
1286 */
1287 if (ndo->ndo_vflag < 2)
1288 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
1289 break;
1290 }
1291 if (ndo->ndo_vflag > 1)
1292 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
1293
1294 return len;
1295
1296 trunc:
1297 ND_PRINT("[|ccp]");
1298 return 0;
1299 }
1300
1301 /* BACP config options */
1302 static u_int
1303 print_bacp_config_options(netdissect_options *ndo,
1304 const u_char *p, u_int length)
1305 {
1306 u_int opt, len;
1307
1308 if (length < 2)
1309 return 0;
1310 ND_TCHECK_2(p);
1311 opt = GET_U_1(p);
1312 len = GET_U_1(p + 1);
1313 if (length < len)
1314 return 0;
1315 if (len < 2) {
1316 ND_PRINT("\n\t %s Option (0x%02x), length %u (length bogus, should be >= 2)",
1317 tok2str(bacconfopts_values, "Unknown", opt),
1318 opt,
1319 len);
1320 return 0;
1321 }
1322
1323 ND_PRINT("\n\t %s Option (0x%02x), length %u",
1324 tok2str(bacconfopts_values, "Unknown", opt),
1325 opt,
1326 len);
1327
1328 switch (opt) {
1329 case BACPOPT_FPEER:
1330 if (len != 6) {
1331 ND_PRINT(" (length bogus, should be = 6)");
1332 return len;
1333 }
1334 ND_PRINT(": Magic-Num 0x%08x", GET_BE_U_4(p + 2));
1335 break;
1336 default:
1337 /*
1338 * Unknown option; dump it as raw bytes now if we're
1339 * not going to do so below.
1340 */
1341 if (ndo->ndo_vflag < 2)
1342 print_unknown_data(ndo, p + 2, "\n\t ", len - 2);
1343 break;
1344 }
1345 if (ndo->ndo_vflag > 1)
1346 print_unknown_data(ndo, p + 2, "\n\t ", len - 2); /* exclude TLV header */
1347
1348 return len;
1349
1350 trunc:
1351 ND_PRINT("[|bacp]");
1352 return 0;
1353 }
1354
1355 /*
1356 * Un-escape RFC 1662 PPP in HDLC-like framing, with octet escapes.
1357 * The length argument is the on-the-wire length, not the captured
1358 * length; we can only un-escape the captured part.
1359 */
1360 static void
1361 ppp_hdlc(netdissect_options *ndo,
1362 const u_char *p, u_int length)
1363 {
1364 u_int caplen = ND_BYTES_AVAILABLE_AFTER(p);
1365 u_char *b, *t, c;
1366 const u_char *s;
1367 u_int i, proto;
1368 const void *se;
1369
1370 if (caplen == 0)
1371 return;
1372
1373 if (length == 0)
1374 return;
1375
1376 b = (u_char *)nd_malloc(ndo, caplen);
1377 if (b == NULL)
1378 return;
1379
1380 /*
1381 * Unescape all the data into a temporary, private, buffer.
1382 * Do this so that we dont overwrite the original packet
1383 * contents.
1384 */
1385 for (s = p, t = b, i = caplen; i != 0; i--) {
1386 c = GET_U_1(s);
1387 s++;
1388 if (c == 0x7d) {
1389 if (i <= 1)
1390 break;
1391 i--;
1392 c = GET_U_1(s) ^ 0x20;
1393 s++;
1394 }
1395 *t++ = c;
1396 }
1397
1398 /*
1399 * Change the end pointer, so bounds checks work.
1400 */
1401 se = ndo->ndo_snapend;
1402 ndo->ndo_snapend = t;
1403 length = ND_BYTES_AVAILABLE_AFTER(b);
1404
1405 /* now lets guess about the payload codepoint format */
1406 if (length < 1)
1407 goto trunc;
1408 proto = GET_U_1(b); /* start with a one-octet codepoint guess */
1409
1410 switch (proto) {
1411 case PPP_IP:
1412 ip_print(ndo, b + 1, length - 1);
1413 goto cleanup;
1414 case PPP_IPV6:
1415 ip6_print(ndo, b + 1, length - 1);
1416 goto cleanup;
1417 default: /* no luck - try next guess */
1418 break;
1419 }
1420
1421 if (length < 2)
1422 goto trunc;
1423 proto = GET_BE_U_2(b); /* next guess - load two octets */
1424
1425 switch (proto) {
1426 case (PPP_ADDRESS << 8 | PPP_CONTROL): /* looks like a PPP frame */
1427 if (length < 4)
1428 goto trunc;
1429 proto = GET_BE_U_2(b + 2); /* load the PPP proto-id */
1430 handle_ppp(ndo, proto, b + 4, length - 4);
1431 break;
1432 default: /* last guess - proto must be a PPP proto-id */
1433 handle_ppp(ndo, proto, b + 2, length - 2);
1434 break;
1435 }
1436
1437 cleanup:
1438 ndo->ndo_snapend = se;
1439 return;
1440
1441 trunc:
1442 ndo->ndo_snapend = se;
1443 nd_print_trunc(ndo);
1444 }
1445
1446
1447 /* PPP */
1448 static void
1449 handle_ppp(netdissect_options *ndo,
1450 u_int proto, const u_char *p, u_int length)
1451 {
1452 if ((proto & 0xff00) == 0x7e00) { /* is this an escape code ? */
1453 ppp_hdlc(ndo, p - 1, length);
1454 return;
1455 }
1456
1457 switch (proto) {
1458 case PPP_LCP: /* fall through */
1459 case PPP_IPCP:
1460 case PPP_OSICP:
1461 case PPP_MPLSCP:
1462 case PPP_IPV6CP:
1463 case PPP_CCP:
1464 case PPP_BACP:
1465 handle_ctrl_proto(ndo, proto, p, length);
1466 break;
1467 case PPP_ML:
1468 handle_mlppp(ndo, p, length);
1469 break;
1470 case PPP_CHAP:
1471 handle_chap(ndo, p, length);
1472 break;
1473 case PPP_PAP:
1474 handle_pap(ndo, p, length);
1475 break;
1476 case PPP_BAP: /* XXX: not yet completed */
1477 handle_bap(ndo, p, length);
1478 break;
1479 case ETHERTYPE_IP: /*XXX*/
1480 case PPP_VJNC:
1481 case PPP_IP:
1482 ip_print(ndo, p, length);
1483 break;
1484 case ETHERTYPE_IPV6: /*XXX*/
1485 case PPP_IPV6:
1486 ip6_print(ndo, p, length);
1487 break;
1488 case ETHERTYPE_IPX: /*XXX*/
1489 case PPP_IPX:
1490 ipx_print(ndo, p, length);
1491 break;
1492 case PPP_OSI:
1493 isoclns_print(ndo, p, length);
1494 break;
1495 case PPP_MPLS_UCAST:
1496 case PPP_MPLS_MCAST:
1497 mpls_print(ndo, p, length);
1498 break;
1499 case PPP_COMP:
1500 ND_PRINT("compressed PPP data");
1501 break;
1502 default:
1503 ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1504 print_unknown_data(ndo, p, "\n\t", length);
1505 break;
1506 }
1507 }
1508
1509 /* Standard PPP printer */
1510 u_int
1511 ppp_print(netdissect_options *ndo,
1512 const u_char *p, u_int length)
1513 {
1514 u_int proto,ppp_header;
1515 u_int olen = length; /* _o_riginal length */
1516 u_int hdr_len = 0;
1517
1518 ndo->ndo_protocol = "ppp";
1519 /*
1520 * Here, we assume that p points to the Address and Control
1521 * field (if they present).
1522 */
1523 if (length < 2)
1524 goto trunc;
1525 ppp_header = GET_BE_U_2(p);
1526
1527 switch(ppp_header) {
1528 case (PPP_PPPD_IN << 8 | PPP_CONTROL):
1529 if (ndo->ndo_eflag) ND_PRINT("In ");
1530 p += 2;
1531 length -= 2;
1532 hdr_len += 2;
1533 break;
1534 case (PPP_PPPD_OUT << 8 | PPP_CONTROL):
1535 if (ndo->ndo_eflag) ND_PRINT("Out ");
1536 p += 2;
1537 length -= 2;
1538 hdr_len += 2;
1539 break;
1540 case (PPP_ADDRESS << 8 | PPP_CONTROL):
1541 p += 2; /* ACFC not used */
1542 length -= 2;
1543 hdr_len += 2;
1544 break;
1545
1546 default:
1547 break;
1548 }
1549
1550 if (length < 2)
1551 goto trunc;
1552 if (GET_U_1(p) % 2) {
1553 proto = GET_U_1(p); /* PFC is used */
1554 p++;
1555 length--;
1556 hdr_len++;
1557 } else {
1558 proto = GET_BE_U_2(p);
1559 p += 2;
1560 length -= 2;
1561 hdr_len += 2;
1562 }
1563
1564 if (ndo->ndo_eflag)
1565 ND_PRINT("%s (0x%04x), length %u: ",
1566 tok2str(ppptype2str, "unknown", proto),
1567 proto,
1568 olen);
1569
1570 handle_ppp(ndo, proto, p, length);
1571 return (hdr_len);
1572 trunc:
1573 nd_print_trunc(ndo);
1574 return (0);
1575 }
1576
1577
1578 /* PPP I/F printer */
1579 void
1580 ppp_if_print(netdissect_options *ndo,
1581 const struct pcap_pkthdr *h, const u_char *p)
1582 {
1583 u_int length = h->len;
1584 u_int caplen = h->caplen;
1585
1586 ndo->ndo_protocol = "ppp";
1587 if (caplen < PPP_HDRLEN) {
1588 nd_print_trunc(ndo);
1589 ndo->ndo_ll_hdr_len += caplen;
1590 return;
1591 }
1592 ndo->ndo_ll_hdr_len += PPP_HDRLEN;
1593
1594 #if 0
1595 /*
1596 * XXX: seems to assume that there are 2 octets prepended to an
1597 * actual PPP frame. The 1st octet looks like Input/Output flag
1598 * while 2nd octet is unknown, at least to me
1599 * (mshindo@mshindo.net).
1600 *
1601 * That was what the original tcpdump code did.
1602 *
1603 * FreeBSD's "if_ppp.c" *does* set the first octet to 1 for outbound
1604 * packets and 0 for inbound packets - but only if the
1605 * protocol field has the 0x8000 bit set (i.e., it's a network
1606 * control protocol); it does so before running the packet through
1607 * "bpf_filter" to see if it should be discarded, and to see
1608 * if we should update the time we sent the most recent packet...
1609 *
1610 * ...but it puts the original address field back after doing
1611 * so.
1612 *
1613 * NetBSD's "if_ppp.c" doesn't set the first octet in that fashion.
1614 *
1615 * I don't know if any PPP implementation handed up to a BPF
1616 * device packets with the first octet being 1 for outbound and
1617 * 0 for inbound packets, so I (guy@alum.mit.edu) don't know
1618 * whether that ever needs to be checked or not.
1619 *
1620 * Note that NetBSD has a DLT_PPP_SERIAL, which it uses for PPP,
1621 * and its tcpdump appears to assume that the frame always
1622 * begins with an address field and a control field, and that
1623 * the address field might be 0x0f or 0x8f, for Cisco
1624 * point-to-point with HDLC framing as per section 4.3.1 of RFC
1625 * 1547, as well as 0xff, for PPP in HDLC-like framing as per
1626 * RFC 1662.
1627 *
1628 * (Is the Cisco framing in question what DLT_C_HDLC, in
1629 * BSD/OS, is?)
1630 */
1631 if (ndo->ndo_eflag)
1632 ND_PRINT("%c %4d %02x ", GET_U_1(p) ? 'O' : 'I',
1633 length, GET_U_1(p + 1));
1634 #endif
1635
1636 ppp_print(ndo, p, length);
1637 }
1638
1639 /*
1640 * PPP I/F printer to use if we know that RFC 1662-style PPP in HDLC-like
1641 * framing, or Cisco PPP with HDLC framing as per section 4.3.1 of RFC 1547,
1642 * is being used (i.e., we don't check for PPP_ADDRESS and PPP_CONTROL,
1643 * discard them *if* those are the first two octets, and parse the remaining
1644 * packet as a PPP packet, as "ppp_print()" does).
1645 *
1646 * This handles, for example, DLT_PPP_SERIAL in NetBSD.
1647 */
1648 void
1649 ppp_hdlc_if_print(netdissect_options *ndo,
1650 const struct pcap_pkthdr *h, const u_char *p)
1651 {
1652 u_int length = h->len;
1653 u_int caplen = h->caplen;
1654 u_int proto;
1655 u_int hdrlen = 0;
1656
1657 ndo->ndo_protocol = "ppp_hdlc";
1658 if (caplen < 2) {
1659 nd_print_trunc(ndo);
1660 ndo->ndo_ll_hdr_len += caplen;
1661 return;
1662 }
1663
1664 switch (GET_U_1(p)) {
1665
1666 case PPP_ADDRESS:
1667 if (caplen < 4) {
1668 nd_print_trunc(ndo);
1669 ndo->ndo_ll_hdr_len += caplen;
1670 return;
1671 }
1672
1673 if (ndo->ndo_eflag)
1674 ND_PRINT("%02x %02x %u ", GET_U_1(p),
1675 GET_U_1(p + 1), length);
1676 p += 2;
1677 length -= 2;
1678 hdrlen += 2;
1679
1680 proto = GET_BE_U_2(p);
1681 p += 2;
1682 length -= 2;
1683 hdrlen += 2;
1684 ND_PRINT("%s: ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", proto));
1685
1686 handle_ppp(ndo, proto, p, length);
1687 break;
1688
1689 case CHDLC_UNICAST:
1690 case CHDLC_BCAST:
1691 chdlc_if_print(ndo, h, p);
1692 return;
1693
1694 default:
1695 if (caplen < 4) {
1696 nd_print_trunc(ndo);
1697 ndo->ndo_ll_hdr_len += caplen;
1698 return;
1699 }
1700
1701 if (ndo->ndo_eflag)
1702 ND_PRINT("%02x %02x %u ", GET_U_1(p),
1703 GET_U_1(p + 1), length);
1704 p += 2;
1705 hdrlen += 2;
1706
1707 /*
1708 * XXX - NetBSD's "ppp_netbsd_serial_if_print()" treats
1709 * the next two octets as an Ethernet type; does that
1710 * ever happen?
1711 */
1712 ND_PRINT("unknown addr %02x; ctrl %02x", GET_U_1(p),
1713 GET_U_1(p + 1));
1714 break;
1715 }
1716
1717 ndo->ndo_ll_hdr_len += hdrlen;
1718 }
1719
1720 #define PPP_BSDI_HDRLEN 24
1721
1722 /* BSD/OS specific PPP printer */
1723 void
1724 ppp_bsdos_if_print(netdissect_options *ndo,
1725 const struct pcap_pkthdr *h _U_, const u_char *p _U_)
1726 {
1727 u_int hdrlength;
1728 #ifdef __bsdi__
1729 u_int length = h->len;
1730 u_int caplen = h->caplen;
1731 uint16_t ptype;
1732 uint8_t llhl;
1733 const u_char *q;
1734 u_int i;
1735
1736 ndo->ndo_protocol = "ppp_bsdos";
1737 if (caplen < PPP_BSDI_HDRLEN) {
1738 nd_print_trunc(ndo);
1739 ndo->ndo_ll_hdr_len += caplen;
1740 return;
1741 }
1742
1743 hdrlength = 0;
1744
1745 #if 0
1746 if (GET_U_1(p) == PPP_ADDRESS &&
1747 GET_U_1(p + 1) == PPP_CONTROL) {
1748 if (ndo->ndo_eflag)
1749 ND_PRINT("%02x %02x ", GET_U_1(p),
1750 GET_U_1(p + 1));
1751 p += 2;
1752 hdrlength = 2;
1753 }
1754
1755 if (ndo->ndo_eflag)
1756 ND_PRINT("%u ", length);
1757 /* Retrieve the protocol type */
1758 if (GET_U_1(p) & 01) {
1759 /* Compressed protocol field */
1760 ptype = GET_U_1(p);
1761 if (ndo->ndo_eflag)
1762 ND_PRINT("%02x ", ptype);
1763 p++;
1764 hdrlength += 1;
1765 } else {
1766 /* Un-compressed protocol field */
1767 ptype = GET_BE_U_2(p);
1768 if (ndo->ndo_eflag)
1769 ND_PRINT("%04x ", ptype);
1770 p += 2;
1771 hdrlength += 2;
1772 }
1773 #else
1774 ptype = 0; /*XXX*/
1775 if (ndo->ndo_eflag)
1776 ND_PRINT("%c ", GET_U_1(p + SLC_DIR) ? 'O' : 'I');
1777 llhl = GET_U_1(p + SLC_LLHL);
1778 if (llhl) {
1779 /* link level header */
1780 struct ppp_header *ph;
1781
1782 q = p + SLC_BPFHDRLEN;
1783 ph = (struct ppp_header *)q;
1784 if (ph->phdr_addr == PPP_ADDRESS
1785 && ph->phdr_ctl == PPP_CONTROL) {
1786 if (ndo->ndo_eflag)
1787 ND_PRINT("%02x %02x ", GET_U_1(q),
1788 GET_U_1(q + 1));
1789 ptype = GET_BE_U_2(&ph->phdr_type);
1790 if (ndo->ndo_eflag && (ptype == PPP_VJC || ptype == PPP_VJNC)) {
1791 ND_PRINT("%s ", tok2str(ppptype2str,
1792 "proto-#%u", ptype));
1793 }
1794 } else {
1795 if (ndo->ndo_eflag) {
1796 ND_PRINT("LLH=[");
1797 for (i = 0; i < llhl; i++)
1798 ND_PRINT("%02x", GET_U_1(q + i));
1799 ND_PRINT("] ");
1800 }
1801 }
1802 }
1803 if (ndo->ndo_eflag)
1804 ND_PRINT("%u ", length);
1805 if (GET_U_1(p + SLC_CHL)) {
1806 q = p + SLC_BPFHDRLEN + llhl;
1807
1808 switch (ptype) {
1809 case PPP_VJC:
1810 ptype = vjc_print(ndo, q, ptype);
1811 hdrlength = PPP_BSDI_HDRLEN;
1812 p += hdrlength;
1813 switch (ptype) {
1814 case PPP_IP:
1815 ip_print(ndo, p, length);
1816 break;
1817 case PPP_IPV6:
1818 ip6_print(ndo, p, length);
1819 break;
1820 case PPP_MPLS_UCAST:
1821 case PPP_MPLS_MCAST:
1822 mpls_print(ndo, p, length);
1823 break;
1824 }
1825 goto printx;
1826 case PPP_VJNC:
1827 ptype = vjc_print(ndo, q, ptype);
1828 hdrlength = PPP_BSDI_HDRLEN;
1829 p += hdrlength;
1830 switch (ptype) {
1831 case PPP_IP:
1832 ip_print(ndo, p, length);
1833 break;
1834 case PPP_IPV6:
1835 ip6_print(ndo, p, length);
1836 break;
1837 case PPP_MPLS_UCAST:
1838 case PPP_MPLS_MCAST:
1839 mpls_print(ndo, p, length);
1840 break;
1841 }
1842 goto printx;
1843 default:
1844 if (ndo->ndo_eflag) {
1845 ND_PRINT("CH=[");
1846 for (i = 0; i < llhl; i++)
1847 ND_PRINT("%02x",
1848 GET_U_1(q + i));
1849 ND_PRINT("] ");
1850 }
1851 break;
1852 }
1853 }
1854
1855 hdrlength = PPP_BSDI_HDRLEN;
1856 #endif
1857
1858 length -= hdrlength;
1859 p += hdrlength;
1860
1861 switch (ptype) {
1862 case PPP_IP:
1863 ip_print(p, length);
1864 break;
1865 case PPP_IPV6:
1866 ip6_print(ndo, p, length);
1867 break;
1868 case PPP_MPLS_UCAST:
1869 case PPP_MPLS_MCAST:
1870 mpls_print(ndo, p, length);
1871 break;
1872 default:
1873 ND_PRINT("%s ", tok2str(ppptype2str, "unknown PPP protocol (0x%04x)", ptype));
1874 }
1875
1876 printx:
1877 #else /* __bsdi */
1878 hdrlength = 0;
1879 #endif /* __bsdi__ */
1880 ndo->ndo_ll_hdr_len += hdrlength;
1881 }
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