1 /*
2  * Copyright (c) 1992, 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  * OSPF support contributed by Jeffrey Honig (jch@mitchell.cit.cornell.edu)
22  */
23 
24 /* \summary: Open Shortest Path First (OSPF) printer */
25 
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29 
30 #include <netdissect-stdinc.h>
31 
32 #include "netdissect.h"
33 #include "addrtoname.h"
34 #include "extract.h"
35 #include "gmpls.h"
36 
37 #include "ospf.h"
38 
39 static const char tstr[] = " [|ospf2]";
40 
41 static const struct tok ospf_option_values[] = {
42         { OSPF_OPTION_T,	"MultiTopology" }, /* draft-ietf-ospf-mt-09 */
43 	{ OSPF_OPTION_E,	"External" },
44 	{ OSPF_OPTION_MC,	"Multicast" },
45 	{ OSPF_OPTION_NP,	"NSSA" },
46         { OSPF_OPTION_L,        "LLS" },
47 	{ OSPF_OPTION_DC,	"Demand Circuit" },
48 	{ OSPF_OPTION_O,	"Opaque" },
49 	{ OSPF_OPTION_DN,	"Up/Down" },
50 	{ 0,			NULL }
51 };
52 
53 static const struct tok ospf_authtype_values[] = {
54 	{ OSPF_AUTH_NONE,	"none" },
55 	{ OSPF_AUTH_SIMPLE,	"simple" },
56 	{ OSPF_AUTH_MD5,	"MD5" },
57 	{ 0,			NULL }
58 };
59 
60 static const struct tok ospf_rla_flag_values[] = {
61 	{ RLA_FLAG_B,		"ABR" },
62 	{ RLA_FLAG_E,		"ASBR" },
63 	{ RLA_FLAG_W1,		"Virtual" },
64 	{ RLA_FLAG_W2,		"W2" },
65 	{ 0,			NULL }
66 };
67 
68 static const struct tok type2str[] = {
69 	{ OSPF_TYPE_UMD,	"UMD" },
70 	{ OSPF_TYPE_HELLO,	"Hello" },
71 	{ OSPF_TYPE_DD,		"Database Description" },
72 	{ OSPF_TYPE_LS_REQ,	"LS-Request" },
73 	{ OSPF_TYPE_LS_UPDATE,	"LS-Update" },
74 	{ OSPF_TYPE_LS_ACK,	"LS-Ack" },
75 	{ 0,			NULL }
76 };
77 
78 static const struct tok lsa_values[] = {
79 	{ LS_TYPE_ROUTER,       "Router" },
80 	{ LS_TYPE_NETWORK,      "Network" },
81 	{ LS_TYPE_SUM_IP,       "Summary" },
82 	{ LS_TYPE_SUM_ABR,      "ASBR Summary" },
83 	{ LS_TYPE_ASE,          "External" },
84 	{ LS_TYPE_GROUP,        "Multicast Group" },
85 	{ LS_TYPE_NSSA,         "NSSA" },
86 	{ LS_TYPE_OPAQUE_LL,    "Link Local Opaque" },
87 	{ LS_TYPE_OPAQUE_AL,    "Area Local Opaque" },
88 	{ LS_TYPE_OPAQUE_DW,    "Domain Wide Opaque" },
89 	{ 0,			NULL }
90 };
91 
92 static const struct tok ospf_dd_flag_values[] = {
93 	{ OSPF_DB_INIT,	        "Init" },
94 	{ OSPF_DB_MORE,	        "More" },
95 	{ OSPF_DB_MASTER,	"Master" },
96     { OSPF_DB_RESYNC,	"OOBResync" },
97 	{ 0,			NULL }
98 };
99 
100 static const struct tok lsa_opaque_values[] = {
101 	{ LS_OPAQUE_TYPE_TE,    "Traffic Engineering" },
102 	{ LS_OPAQUE_TYPE_GRACE, "Graceful restart" },
103 	{ LS_OPAQUE_TYPE_RI,    "Router Information" },
104 	{ 0,			NULL }
105 };
106 
107 static const struct tok lsa_opaque_te_tlv_values[] = {
108 	{ LS_OPAQUE_TE_TLV_ROUTER, "Router Address" },
109 	{ LS_OPAQUE_TE_TLV_LINK,   "Link" },
110 	{ 0,			NULL }
111 };
112 
113 static const struct tok lsa_opaque_te_link_tlv_subtlv_values[] = {
114 	{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE,            "Link Type" },
115 	{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID,              "Link ID" },
116 	{ LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP,             "Local Interface IP address" },
117 	{ LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP,            "Remote Interface IP address" },
118 	{ LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC,            "Traffic Engineering Metric" },
119 	{ LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW,               "Maximum Bandwidth" },
120 	{ LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW,           "Maximum Reservable Bandwidth" },
121 	{ LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW,             "Unreserved Bandwidth" },
122 	{ LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP,          "Administrative Group" },
123 	{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" },
124 	{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE, "Link Protection Type" },
125 	{ LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR,    "Interface Switching Capability" },
126 	{ LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP,    "Shared Risk Link Group" },
127 	{ LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS,       "Bandwidth Constraints" },
128 	{ 0,			NULL }
129 };
130 
131 static const struct tok lsa_opaque_grace_tlv_values[] = {
132 	{ LS_OPAQUE_GRACE_TLV_PERIOD,             "Grace Period" },
133 	{ LS_OPAQUE_GRACE_TLV_REASON,             "Graceful restart Reason" },
134 	{ LS_OPAQUE_GRACE_TLV_INT_ADDRESS,        "IPv4 interface address" },
135 	{ 0,		        NULL }
136 };
137 
138 static const struct tok lsa_opaque_grace_tlv_reason_values[] = {
139 	{ LS_OPAQUE_GRACE_TLV_REASON_UNKNOWN,     "Unknown" },
140 	{ LS_OPAQUE_GRACE_TLV_REASON_SW_RESTART,  "Software Restart" },
141 	{ LS_OPAQUE_GRACE_TLV_REASON_SW_UPGRADE,  "Software Reload/Upgrade" },
142 	{ LS_OPAQUE_GRACE_TLV_REASON_CP_SWITCH,   "Control Processor Switch" },
143 	{ 0,		        NULL }
144 };
145 
146 static const struct tok lsa_opaque_te_tlv_link_type_sub_tlv_values[] = {
147 	{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_PTP, "Point-to-point" },
148 	{ LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE_MA,  "Multi-Access" },
149 	{ 0,			NULL }
150 };
151 
152 static const struct tok lsa_opaque_ri_tlv_values[] = {
153 	{ LS_OPAQUE_RI_TLV_CAP, "Router Capabilities" },
154 	{ 0,		        NULL }
155 };
156 
157 static const struct tok lsa_opaque_ri_tlv_cap_values[] = {
158 	{ 1, "Reserved" },
159 	{ 2, "Reserved" },
160 	{ 4, "Reserved" },
161 	{ 8, "Reserved" },
162 	{ 16, "graceful restart capable" },
163 	{ 32, "graceful restart helper" },
164 	{ 64, "Stub router support" },
165 	{ 128, "Traffic engineering" },
166 	{ 256, "p2p over LAN" },
167 	{ 512, "path computation server" },
168 	{ 0,		        NULL }
169 };
170 
171 static const struct tok ospf_lls_tlv_values[] = {
172 	{ OSPF_LLS_EO,	"Extended Options" },
173 	{ OSPF_LLS_MD5,	"MD5 Authentication" },
174 	{ 0,	NULL }
175 };
176 
177 static const struct tok ospf_lls_eo_options[] = {
178 	{ OSPF_LLS_EO_LR,	"LSDB resync" },
179 	{ OSPF_LLS_EO_RS,	"Restart" },
180 	{ 0,	NULL }
181 };
182 
183 int
ospf_print_grace_lsa(netdissect_options * ndo,const uint8_t * tptr,u_int ls_length)184 ospf_print_grace_lsa(netdissect_options *ndo,
185                      const uint8_t *tptr, u_int ls_length)
186 {
187     u_int tlv_type, tlv_length;
188 
189 
190     while (ls_length > 0) {
191         ND_TCHECK2(*tptr, 4);
192         if (ls_length < 4) {
193             ND_PRINT((ndo, "\n\t    Remaining LS length %u < 4", ls_length));
194             return -1;
195         }
196         tlv_type = EXTRACT_16BITS(tptr);
197         tlv_length = EXTRACT_16BITS(tptr+2);
198         tptr+=4;
199         ls_length-=4;
200 
201         ND_PRINT((ndo, "\n\t    %s TLV (%u), length %u, value: ",
202                tok2str(lsa_opaque_grace_tlv_values,"unknown",tlv_type),
203                tlv_type,
204                tlv_length));
205 
206         if (tlv_length > ls_length) {
207             ND_PRINT((ndo, "\n\t    Bogus length %u > %u", tlv_length,
208                    ls_length));
209             return -1;
210         }
211 
212         /* Infinite loop protection. */
213         if (tlv_type == 0 || tlv_length ==0) {
214             return -1;
215         }
216 
217         ND_TCHECK2(*tptr, tlv_length);
218         switch(tlv_type) {
219 
220         case LS_OPAQUE_GRACE_TLV_PERIOD:
221             if (tlv_length != 4) {
222                 ND_PRINT((ndo, "\n\t    Bogus length %u != 4", tlv_length));
223                 return -1;
224             }
225             ND_PRINT((ndo, "%us", EXTRACT_32BITS(tptr)));
226             break;
227 
228         case LS_OPAQUE_GRACE_TLV_REASON:
229             if (tlv_length != 1) {
230                 ND_PRINT((ndo, "\n\t    Bogus length %u != 1", tlv_length));
231                 return -1;
232             }
233             ND_PRINT((ndo, "%s (%u)",
234                    tok2str(lsa_opaque_grace_tlv_reason_values, "Unknown", *tptr),
235                    *tptr));
236             break;
237 
238         case LS_OPAQUE_GRACE_TLV_INT_ADDRESS:
239             if (tlv_length != 4) {
240                 ND_PRINT((ndo, "\n\t    Bogus length %u != 4", tlv_length));
241                 return -1;
242             }
243             ND_PRINT((ndo, "%s", ipaddr_string(ndo, tptr)));
244             break;
245 
246         default:
247             if (ndo->ndo_vflag <= 1) {
248                 if (!print_unknown_data(ndo, tptr, "\n\t      ", tlv_length))
249                     return -1;
250             }
251             break;
252 
253         }
254         /* in OSPF everything has to be 32-bit aligned, including TLVs */
255         if (tlv_length%4 != 0)
256             tlv_length+=4-(tlv_length%4);
257         ls_length-=tlv_length;
258         tptr+=tlv_length;
259     }
260 
261     return 0;
262 trunc:
263     return -1;
264 }
265 
266 int
ospf_print_te_lsa(netdissect_options * ndo,const uint8_t * tptr,u_int ls_length)267 ospf_print_te_lsa(netdissect_options *ndo,
268                   const uint8_t *tptr, u_int ls_length)
269 {
270     u_int tlv_type, tlv_length, subtlv_type, subtlv_length;
271     u_int priority_level, te_class, count_srlg;
272     union { /* int to float conversion buffer for several subTLVs */
273         float f;
274         uint32_t i;
275     } bw;
276 
277     while (ls_length != 0) {
278         ND_TCHECK2(*tptr, 4);
279         if (ls_length < 4) {
280             ND_PRINT((ndo, "\n\t    Remaining LS length %u < 4", ls_length));
281             return -1;
282         }
283         tlv_type = EXTRACT_16BITS(tptr);
284         tlv_length = EXTRACT_16BITS(tptr+2);
285         tptr+=4;
286         ls_length-=4;
287 
288         ND_PRINT((ndo, "\n\t    %s TLV (%u), length: %u",
289                tok2str(lsa_opaque_te_tlv_values,"unknown",tlv_type),
290                tlv_type,
291                tlv_length));
292 
293         if (tlv_length > ls_length) {
294             ND_PRINT((ndo, "\n\t    Bogus length %u > %u", tlv_length,
295                    ls_length));
296             return -1;
297         }
298 
299         /* Infinite loop protection. */
300         if (tlv_type == 0 || tlv_length ==0) {
301             return -1;
302         }
303 
304         switch(tlv_type) {
305         case LS_OPAQUE_TE_TLV_LINK:
306             while (tlv_length >= sizeof(subtlv_type) + sizeof(subtlv_length)) {
307                 if (tlv_length < 4) {
308                     ND_PRINT((ndo, "\n\t    Remaining TLV length %u < 4",
309                            tlv_length));
310                     return -1;
311                 }
312                 ND_TCHECK2(*tptr, 4);
313                 subtlv_type = EXTRACT_16BITS(tptr);
314                 subtlv_length = EXTRACT_16BITS(tptr+2);
315                 tptr+=4;
316                 tlv_length-=4;
317 
318 		/* Infinite loop protection */
319 		if (subtlv_type == 0 || subtlv_length == 0)
320 		    goto invalid;
321 
322                 ND_PRINT((ndo, "\n\t      %s subTLV (%u), length: %u",
323                        tok2str(lsa_opaque_te_link_tlv_subtlv_values,"unknown",subtlv_type),
324                        subtlv_type,
325                        subtlv_length));
326 
327                 ND_TCHECK2(*tptr, subtlv_length);
328                 switch(subtlv_type) {
329                 case LS_OPAQUE_TE_LINK_SUBTLV_ADMIN_GROUP:
330 		    if (subtlv_length != 4) {
331 			ND_PRINT((ndo, " != 4"));
332 			goto invalid;
333 		    }
334                     ND_PRINT((ndo, ", 0x%08x", EXTRACT_32BITS(tptr)));
335                     break;
336                 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_ID:
337                 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_LOCAL_REMOTE_ID:
338 		    if (subtlv_length != 4 && subtlv_length != 8) {
339 			ND_PRINT((ndo, " != 4 && != 8"));
340 			goto invalid;
341 		    }
342                     ND_PRINT((ndo, ", %s (0x%08x)",
343                            ipaddr_string(ndo, tptr),
344                            EXTRACT_32BITS(tptr)));
345                     if (subtlv_length == 8) /* rfc4203 */
346                         ND_PRINT((ndo, ", %s (0x%08x)",
347                                ipaddr_string(ndo, tptr+4),
348                                EXTRACT_32BITS(tptr + 4)));
349                     break;
350                 case LS_OPAQUE_TE_LINK_SUBTLV_LOCAL_IP:
351                 case LS_OPAQUE_TE_LINK_SUBTLV_REMOTE_IP:
352 		    if (subtlv_length != 4) {
353 			ND_PRINT((ndo, " != 4"));
354 			goto invalid;
355 		    }
356                     ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr)));
357                     break;
358                 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_BW:
359                 case LS_OPAQUE_TE_LINK_SUBTLV_MAX_RES_BW:
360 		    if (subtlv_length != 4) {
361 			ND_PRINT((ndo, " != 4"));
362 			goto invalid;
363 		    }
364                     bw.i = EXTRACT_32BITS(tptr);
365                     ND_PRINT((ndo, ", %.3f Mbps", bw.f * 8 / 1000000));
366                     break;
367                 case LS_OPAQUE_TE_LINK_SUBTLV_UNRES_BW:
368 		    if (subtlv_length != 32) {
369 			ND_PRINT((ndo, " != 32"));
370 			goto invalid;
371 		    }
372                     for (te_class = 0; te_class < 8; te_class++) {
373                         bw.i = EXTRACT_32BITS(tptr+te_class*4);
374                         ND_PRINT((ndo, "\n\t\tTE-Class %u: %.3f Mbps",
375                                te_class,
376                                bw.f * 8 / 1000000));
377                     }
378                     break;
379                 case LS_OPAQUE_TE_LINK_SUBTLV_BW_CONSTRAINTS:
380 		    if (subtlv_length < 4) {
381 			ND_PRINT((ndo, " < 4"));
382 			goto invalid;
383 		    }
384 		    /* BC Model Id (1 octet) + Reserved (3 octets) */
385                     ND_PRINT((ndo, "\n\t\tBandwidth Constraints Model ID: %s (%u)",
386                            tok2str(diffserv_te_bc_values, "unknown", *tptr),
387                            *tptr));
388 		    if (subtlv_length % 4 != 0) {
389 			ND_PRINT((ndo, "\n\t\tlength %u != N x 4", subtlv_length));
390 			goto invalid;
391 		    }
392 		    if (subtlv_length > 36) {
393 			ND_PRINT((ndo, "\n\t\tlength %u > 36", subtlv_length));
394 			goto invalid;
395 		    }
396                     /* decode BCs until the subTLV ends */
397                     for (te_class = 0; te_class < (subtlv_length-4)/4; te_class++) {
398                         bw.i = EXTRACT_32BITS(tptr+4+te_class*4);
399                         ND_PRINT((ndo, "\n\t\t  Bandwidth constraint CT%u: %.3f Mbps",
400                                te_class,
401                                bw.f * 8 / 1000000));
402                     }
403                     break;
404                 case LS_OPAQUE_TE_LINK_SUBTLV_TE_METRIC:
405 		    if (subtlv_length != 4) {
406 			ND_PRINT((ndo, " != 4"));
407 			goto invalid;
408 		    }
409                     ND_PRINT((ndo, ", Metric %u", EXTRACT_32BITS(tptr)));
410                     break;
411                 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_PROTECTION_TYPE:
412 		    /* Protection Cap (1 octet) + Reserved ((3 octets) */
413 		    if (subtlv_length != 4) {
414 			ND_PRINT((ndo, " != 4"));
415 			goto invalid;
416 		    }
417                     ND_PRINT((ndo, ", %s",
418                              bittok2str(gmpls_link_prot_values, "none", *tptr)));
419                     break;
420                 case LS_OPAQUE_TE_LINK_SUBTLV_INTF_SW_CAP_DESCR:
421 		    if (subtlv_length < 36) {
422 			ND_PRINT((ndo, " < 36"));
423 			goto invalid;
424 		    }
425 		    /* Switching Cap (1 octet) + Encoding (1) +  Reserved (2) */
426                     ND_PRINT((ndo, "\n\t\tInterface Switching Capability: %s",
427                            tok2str(gmpls_switch_cap_values, "Unknown", *(tptr))));
428                     ND_PRINT((ndo, "\n\t\tLSP Encoding: %s\n\t\tMax LSP Bandwidth:",
429                            tok2str(gmpls_encoding_values, "Unknown", *(tptr + 1))));
430                     for (priority_level = 0; priority_level < 8; priority_level++) {
431                         bw.i = EXTRACT_32BITS(tptr+4+(priority_level*4));
432                         ND_PRINT((ndo, "\n\t\t  priority level %d: %.3f Mbps",
433                                priority_level,
434                                bw.f * 8 / 1000000));
435                     }
436                     break;
437                 case LS_OPAQUE_TE_LINK_SUBTLV_LINK_TYPE:
438 		    if (subtlv_length != 1) {
439 			ND_PRINT((ndo, " != 1"));
440 			goto invalid;
441 		    }
442                     ND_PRINT((ndo, ", %s (%u)",
443                            tok2str(lsa_opaque_te_tlv_link_type_sub_tlv_values,"unknown",*tptr),
444                            *tptr));
445                     break;
446 
447                 case LS_OPAQUE_TE_LINK_SUBTLV_SHARED_RISK_GROUP:
448 		    if (subtlv_length % 4 != 0) {
449 			ND_PRINT((ndo, " != N x 4"));
450 			goto invalid;
451 		    }
452                     count_srlg = subtlv_length / 4;
453                     if (count_srlg != 0)
454                         ND_PRINT((ndo, "\n\t\t  Shared risk group: "));
455                     while (count_srlg > 0) {
456                         bw.i = EXTRACT_32BITS(tptr);
457                         ND_PRINT((ndo, "%d", bw.i));
458                         tptr+=4;
459                         count_srlg--;
460                         if (count_srlg > 0)
461                             ND_PRINT((ndo, ", "));
462                     }
463                     break;
464 
465                 default:
466                     if (ndo->ndo_vflag <= 1) {
467                         if (!print_unknown_data(ndo, tptr, "\n\t\t", subtlv_length))
468                             return -1;
469                     }
470                     break;
471                 }
472                 /* in OSPF everything has to be 32-bit aligned, including subTLVs */
473                 if (subtlv_length%4 != 0)
474                     subtlv_length+=4-(subtlv_length%4);
475 
476                 tlv_length-=subtlv_length;
477                 tptr+=subtlv_length;
478 
479             }
480             break;
481 
482         case LS_OPAQUE_TE_TLV_ROUTER:
483             if (tlv_length < 4) {
484                 ND_PRINT((ndo, "\n\t    TLV length %u < 4", tlv_length));
485                 return -1;
486             }
487             ND_TCHECK2(*tptr, 4);
488             ND_PRINT((ndo, ", %s", ipaddr_string(ndo, tptr)));
489             break;
490 
491         default:
492             if (ndo->ndo_vflag <= 1) {
493                 if (!print_unknown_data(ndo, tptr, "\n\t      ", tlv_length))
494                     return -1;
495             }
496             break;
497         }
498         /* in OSPF everything has to be 32-bit aligned, including TLVs */
499         if (tlv_length%4 != 0)
500             tlv_length+=4-(tlv_length%4);
501         ls_length-=tlv_length;
502         tptr+=tlv_length;
503     }
504     return 0;
505 trunc:
506     return -1;
507 invalid:
508     ND_PRINT((ndo, "%s", istr));
509     return -1;
510 }
511 
512 static int
ospf_print_lshdr(netdissect_options * ndo,register const struct lsa_hdr * lshp)513 ospf_print_lshdr(netdissect_options *ndo,
514                  register const struct lsa_hdr *lshp)
515 {
516         u_int ls_length;
517 
518         ND_TCHECK(lshp->ls_length);
519         ls_length = EXTRACT_16BITS(&lshp->ls_length);
520         if (ls_length < sizeof(struct lsa_hdr)) {
521                 ND_PRINT((ndo, "\n\t    Bogus length %u < header (%lu)", ls_length,
522                     (unsigned long)sizeof(struct lsa_hdr)));
523                 return(-1);
524         }
525 
526         ND_TCHECK(lshp->ls_seq); /* XXX - ls_length check checked this */
527         ND_PRINT((ndo, "\n\t  Advertising Router %s, seq 0x%08x, age %us, length %u",
528                   ipaddr_string(ndo, &lshp->ls_router),
529                   EXTRACT_32BITS(&lshp->ls_seq),
530                   EXTRACT_16BITS(&lshp->ls_age),
531                   ls_length - (u_int)sizeof(struct lsa_hdr)));
532 
533         ND_TCHECK(lshp->ls_type); /* XXX - ls_length check checked this */
534         switch (lshp->ls_type) {
535         /* the LSA header for opaque LSAs was slightly changed */
536         case LS_TYPE_OPAQUE_LL:
537         case LS_TYPE_OPAQUE_AL:
538         case LS_TYPE_OPAQUE_DW:
539             ND_PRINT((ndo, "\n\t    %s LSA (%d), Opaque-Type %s LSA (%u), Opaque-ID %u",
540                    tok2str(lsa_values,"unknown",lshp->ls_type),
541                    lshp->ls_type,
542 
543 		   tok2str(lsa_opaque_values,
544 			   "unknown",
545 			   *(&lshp->un_lsa_id.opaque_field.opaque_type)),
546 		   *(&lshp->un_lsa_id.opaque_field.opaque_type),
547 		   EXTRACT_24BITS(&lshp->un_lsa_id.opaque_field.opaque_id)
548 
549                    ));
550             break;
551 
552         /* all other LSA types use regular style LSA headers */
553         default:
554             ND_PRINT((ndo, "\n\t    %s LSA (%d), LSA-ID: %s",
555                    tok2str(lsa_values,"unknown",lshp->ls_type),
556                    lshp->ls_type,
557                    ipaddr_string(ndo, &lshp->un_lsa_id.lsa_id)));
558             break;
559         }
560 
561         ND_TCHECK(lshp->ls_options); /* XXX - ls_length check checked this */
562         ND_PRINT((ndo, "\n\t    Options: [%s]", bittok2str(ospf_option_values, "none", lshp->ls_options)));
563 
564         return (ls_length);
565 trunc:
566 	return (-1);
567 }
568 
569 /* draft-ietf-ospf-mt-09 */
570 static const struct tok ospf_topology_values[] = {
571     { 0, "default" },
572     { 1, "multicast" },
573     { 2, "management" },
574     { 0, NULL }
575 };
576 
577 /*
578  * Print all the per-topology metrics.
579  */
580 static int
ospf_print_tos_metrics(netdissect_options * ndo,const union un_tos * tos)581 ospf_print_tos_metrics(netdissect_options *ndo,
582                        const union un_tos *tos)
583 {
584     int metric_count;
585     int toscount;
586 
587     toscount = tos->link.link_tos_count+1;
588     metric_count = 0;
589 
590     /*
591      * All but the first metric contain a valid topology id.
592      */
593     while (toscount > 0) {
594         ND_TCHECK(*tos);
595         ND_PRINT((ndo, "\n\t\ttopology %s (%u), metric %u",
596                tok2str(ospf_topology_values, "Unknown",
597                        metric_count ? tos->metrics.tos_type : 0),
598                metric_count ? tos->metrics.tos_type : 0,
599                EXTRACT_16BITS(&tos->metrics.tos_metric)));
600         metric_count++;
601         tos++;
602         toscount--;
603     }
604     return 0;
605 trunc:
606     return 1;
607 }
608 
609 /*
610  * Print a single link state advertisement.  If truncated or if LSA length
611  * field is less than the length of the LSA header, return NULl, else
612  * return pointer to data past end of LSA.
613  */
614 static const uint8_t *
ospf_print_lsa(netdissect_options * ndo,register const struct lsa * lsap)615 ospf_print_lsa(netdissect_options *ndo,
616                register const struct lsa *lsap)
617 {
618 	register const uint8_t *ls_end;
619 	register const struct rlalink *rlp;
620 	register const struct in_addr *ap;
621 	register const struct aslametric *almp;
622 	register const struct mcla *mcp;
623 	register const uint32_t *lp;
624 	register int j, tlv_type, tlv_length, topology;
625 	register int ls_length;
626 	const uint8_t *tptr;
627 
628 	tptr = (const uint8_t *)lsap->lsa_un.un_unknown; /* squelch compiler warnings */
629         ls_length = ospf_print_lshdr(ndo, &lsap->ls_hdr);
630         if (ls_length == -1)
631                 return(NULL);
632 	ls_end = (const uint8_t *)lsap + ls_length;
633 	ls_length -= sizeof(struct lsa_hdr);
634 
635 	switch (lsap->ls_hdr.ls_type) {
636 
637 	case LS_TYPE_ROUTER:
638 		ND_TCHECK(lsap->lsa_un.un_rla.rla_flags);
639 		ND_PRINT((ndo, "\n\t    Router LSA Options: [%s]",
640 		          bittok2str(ospf_rla_flag_values, "none", lsap->lsa_un.un_rla.rla_flags)));
641 
642 		ND_TCHECK(lsap->lsa_un.un_rla.rla_count);
643 		j = EXTRACT_16BITS(&lsap->lsa_un.un_rla.rla_count);
644 		ND_TCHECK(lsap->lsa_un.un_rla.rla_link);
645 		rlp = lsap->lsa_un.un_rla.rla_link;
646 		while (j--) {
647 			ND_TCHECK(*rlp);
648 			switch (rlp->un_tos.link.link_type) {
649 
650 			case RLA_TYPE_VIRTUAL:
651 				ND_PRINT((ndo, "\n\t      Virtual Link: Neighbor Router-ID: %s, Interface Address: %s",
652 				    ipaddr_string(ndo, &rlp->link_id),
653 				    ipaddr_string(ndo, &rlp->link_data)));
654 				break;
655 
656 			case RLA_TYPE_ROUTER:
657 				ND_PRINT((ndo, "\n\t      Neighbor Router-ID: %s, Interface Address: %s",
658 				    ipaddr_string(ndo, &rlp->link_id),
659 				    ipaddr_string(ndo, &rlp->link_data)));
660 				break;
661 
662 			case RLA_TYPE_TRANSIT:
663 				ND_PRINT((ndo, "\n\t      Neighbor Network-ID: %s, Interface Address: %s",
664 				    ipaddr_string(ndo, &rlp->link_id),
665 				    ipaddr_string(ndo, &rlp->link_data)));
666 				break;
667 
668 			case RLA_TYPE_STUB:
669 				ND_PRINT((ndo, "\n\t      Stub Network: %s, Mask: %s",
670 				    ipaddr_string(ndo, &rlp->link_id),
671 				    ipaddr_string(ndo, &rlp->link_data)));
672 				break;
673 
674 			default:
675 				ND_PRINT((ndo, "\n\t      Unknown Router Link Type (%u)",
676 				    rlp->un_tos.link.link_type));
677 				return (ls_end);
678 			}
679 
680 			if (ospf_print_tos_metrics(ndo, &rlp->un_tos))
681 				goto trunc;
682 
683 			rlp = (const struct rlalink *)((const u_char *)(rlp + 1) +
684 			    ((rlp->un_tos.link.link_tos_count) * sizeof(union un_tos)));
685 		}
686 		break;
687 
688 	case LS_TYPE_NETWORK:
689 		ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
690 		ND_PRINT((ndo, "\n\t    Mask %s\n\t    Connected Routers:",
691 		    ipaddr_string(ndo, &lsap->lsa_un.un_nla.nla_mask)));
692 		ap = lsap->lsa_un.un_nla.nla_router;
693 		while ((const u_char *)ap < ls_end) {
694 			ND_TCHECK(*ap);
695 			ND_PRINT((ndo, "\n\t      %s", ipaddr_string(ndo, ap)));
696 			++ap;
697 		}
698 		break;
699 
700 	case LS_TYPE_SUM_IP:
701 		ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
702 		ND_PRINT((ndo, "\n\t    Mask %s",
703 		    ipaddr_string(ndo, &lsap->lsa_un.un_sla.sla_mask)));
704 		ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
705 		lp = lsap->lsa_un.un_sla.sla_tosmetric;
706 		while ((const u_char *)lp < ls_end) {
707 			register uint32_t ul;
708 
709 			ND_TCHECK(*lp);
710 			ul = EXTRACT_32BITS(lp);
711                         topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
712 			ND_PRINT((ndo, "\n\t\ttopology %s (%u) metric %d",
713                                tok2str(ospf_topology_values, "Unknown", topology),
714                                topology,
715                                ul & SLA_MASK_METRIC));
716 			++lp;
717 		}
718 		break;
719 
720 	case LS_TYPE_SUM_ABR:
721 		ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
722 		lp = lsap->lsa_un.un_sla.sla_tosmetric;
723 		while ((const u_char *)lp < ls_end) {
724 			register uint32_t ul;
725 
726 			ND_TCHECK(*lp);
727 			ul = EXTRACT_32BITS(lp);
728                         topology = (ul & SLA_MASK_TOS) >> SLA_SHIFT_TOS;
729 			ND_PRINT((ndo, "\n\t\ttopology %s (%u) metric %d",
730                                tok2str(ospf_topology_values, "Unknown", topology),
731                                topology,
732                                ul & SLA_MASK_METRIC));
733 			++lp;
734 		}
735 		break;
736 
737 	case LS_TYPE_ASE:
738         case LS_TYPE_NSSA: /* fall through - those LSAs share the same format */
739 		ND_TCHECK(lsap->lsa_un.un_nla.nla_mask);
740 		ND_PRINT((ndo, "\n\t    Mask %s",
741 		    ipaddr_string(ndo, &lsap->lsa_un.un_asla.asla_mask)));
742 
743 		ND_TCHECK(lsap->lsa_un.un_sla.sla_tosmetric);
744 		almp = lsap->lsa_un.un_asla.asla_metric;
745 		while ((const u_char *)almp < ls_end) {
746 			register uint32_t ul;
747 
748 			ND_TCHECK(almp->asla_tosmetric);
749 			ul = EXTRACT_32BITS(&almp->asla_tosmetric);
750                         topology = ((ul & ASLA_MASK_TOS) >> ASLA_SHIFT_TOS);
751 			ND_PRINT((ndo, "\n\t\ttopology %s (%u), type %d, metric",
752                                tok2str(ospf_topology_values, "Unknown", topology),
753                                topology,
754                                (ul & ASLA_FLAG_EXTERNAL) ? 2 : 1));
755 			if ((ul & ASLA_MASK_METRIC) == 0xffffff)
756 				ND_PRINT((ndo, " infinite"));
757 			else
758 				ND_PRINT((ndo, " %d", (ul & ASLA_MASK_METRIC)));
759 
760 			ND_TCHECK(almp->asla_forward);
761 			if (almp->asla_forward.s_addr) {
762 				ND_PRINT((ndo, ", forward %s", ipaddr_string(ndo, &almp->asla_forward)));
763 			}
764 			ND_TCHECK(almp->asla_tag);
765 			if (almp->asla_tag.s_addr) {
766 				ND_PRINT((ndo, ", tag %s", ipaddr_string(ndo, &almp->asla_tag)));
767 			}
768 			++almp;
769 		}
770 		break;
771 
772 	case LS_TYPE_GROUP:
773 		/* Multicast extensions as of 23 July 1991 */
774 		mcp = lsap->lsa_un.un_mcla;
775 		while ((const u_char *)mcp < ls_end) {
776 			ND_TCHECK(mcp->mcla_vid);
777 			switch (EXTRACT_32BITS(&mcp->mcla_vtype)) {
778 
779 			case MCLA_VERTEX_ROUTER:
780 				ND_PRINT((ndo, "\n\t    Router Router-ID %s",
781 				    ipaddr_string(ndo, &mcp->mcla_vid)));
782 				break;
783 
784 			case MCLA_VERTEX_NETWORK:
785 				ND_PRINT((ndo, "\n\t    Network Designated Router %s",
786 				    ipaddr_string(ndo, &mcp->mcla_vid)));
787 				break;
788 
789 			default:
790 				ND_PRINT((ndo, "\n\t    unknown VertexType (%u)",
791 				    EXTRACT_32BITS(&mcp->mcla_vtype)));
792 				break;
793 			}
794 		++mcp;
795 		}
796 		break;
797 
798 	case LS_TYPE_OPAQUE_LL: /* fall through */
799 	case LS_TYPE_OPAQUE_AL:
800 	case LS_TYPE_OPAQUE_DW:
801 
802 	    switch (*(&lsap->ls_hdr.un_lsa_id.opaque_field.opaque_type)) {
803             case LS_OPAQUE_TYPE_RI:
804 		tptr = (const uint8_t *)(&lsap->lsa_un.un_ri_tlv.type);
805 
806 		while (ls_length != 0) {
807                     ND_TCHECK2(*tptr, 4);
808 		    if (ls_length < 4) {
809                         ND_PRINT((ndo, "\n\t    Remaining LS length %u < 4", ls_length));
810                         return(ls_end);
811                     }
812                     tlv_type = EXTRACT_16BITS(tptr);
813                     tlv_length = EXTRACT_16BITS(tptr+2);
814                     tptr+=4;
815                     ls_length-=4;
816 
817                     ND_PRINT((ndo, "\n\t    %s TLV (%u), length: %u, value: ",
818                            tok2str(lsa_opaque_ri_tlv_values,"unknown",tlv_type),
819                            tlv_type,
820                            tlv_length));
821 
822                     if (tlv_length > ls_length) {
823                         ND_PRINT((ndo, "\n\t    Bogus length %u > %u", tlv_length,
824                             ls_length));
825                         return(ls_end);
826                     }
827                     ND_TCHECK2(*tptr, tlv_length);
828                     switch(tlv_type) {
829 
830                     case LS_OPAQUE_RI_TLV_CAP:
831                         if (tlv_length != 4) {
832                             ND_PRINT((ndo, "\n\t    Bogus length %u != 4", tlv_length));
833                             return(ls_end);
834                         }
835                         ND_PRINT((ndo, "Capabilities: %s",
836                                bittok2str(lsa_opaque_ri_tlv_cap_values, "Unknown", EXTRACT_32BITS(tptr))));
837                         break;
838                     default:
839                         if (ndo->ndo_vflag <= 1) {
840                             if (!print_unknown_data(ndo, tptr, "\n\t      ", tlv_length))
841                                 return(ls_end);
842                         }
843                         break;
844 
845                     }
846                     tptr+=tlv_length;
847                     ls_length-=tlv_length;
848                 }
849                 break;
850 
851             case LS_OPAQUE_TYPE_GRACE:
852                 if (ospf_print_grace_lsa(ndo, (const uint8_t *)(&lsap->lsa_un.un_grace_tlv.type),
853                                          ls_length) == -1) {
854                     return(ls_end);
855                 }
856                 break;
857 
858 	    case LS_OPAQUE_TYPE_TE:
859                 if (ospf_print_te_lsa(ndo, (const uint8_t *)(&lsap->lsa_un.un_te_lsa_tlv.type),
860                                       ls_length) == -1) {
861                     return(ls_end);
862                 }
863                 break;
864 
865             default:
866                 if (ndo->ndo_vflag <= 1) {
867                     if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
868                                            "\n\t    ", ls_length))
869                         return(ls_end);
870                 }
871                 break;
872             }
873         }
874 
875         /* do we want to see an additionally hexdump ? */
876         if (ndo->ndo_vflag> 1)
877             if (!print_unknown_data(ndo, (const uint8_t *)lsap->lsa_un.un_unknown,
878                                    "\n\t    ", ls_length)) {
879                 return(ls_end);
880             }
881 
882 	return (ls_end);
883 trunc:
884 	return (NULL);
885 }
886 
887 static int
ospf_decode_lls(netdissect_options * ndo,register const struct ospfhdr * op,register u_int length)888 ospf_decode_lls(netdissect_options *ndo,
889                 register const struct ospfhdr *op, register u_int length)
890 {
891     register const u_char *dptr;
892     register const u_char *dataend;
893     register u_int length2;
894     register uint16_t lls_type, lls_len;
895     register uint32_t lls_flags;
896 
897     switch (op->ospf_type) {
898 
899     case OSPF_TYPE_HELLO:
900         if (!(op->ospf_hello.hello_options & OSPF_OPTION_L))
901             return (0);
902         break;
903 
904     case OSPF_TYPE_DD:
905         if (!(op->ospf_db.db_options & OSPF_OPTION_L))
906             return (0);
907         break;
908 
909     default:
910         return (0);
911     }
912 
913     /* dig deeper if LLS data is available; see RFC4813 */
914     length2 = EXTRACT_16BITS(&op->ospf_len);
915     dptr = (const u_char *)op + length2;
916     dataend = (const u_char *)op + length;
917 
918     if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
919         dptr = dptr + op->ospf_authdata[3];
920         length2 += op->ospf_authdata[3];
921     }
922     if (length2 >= length) {
923         ND_PRINT((ndo, "\n\t[LLS truncated]"));
924         return (1);
925     }
926     ND_TCHECK2(*dptr, 2);
927     ND_PRINT((ndo, "\n\t  LLS: checksum: 0x%04x", (u_int)EXTRACT_16BITS(dptr)));
928 
929     dptr += 2;
930     ND_TCHECK2(*dptr, 2);
931     length2 = EXTRACT_16BITS(dptr);
932     ND_PRINT((ndo, ", length: %u", length2));
933 
934     dptr += 2;
935     ND_TCHECK(*dptr);
936     while (dptr < dataend) {
937         ND_TCHECK2(*dptr, 2);
938         lls_type = EXTRACT_16BITS(dptr);
939         ND_PRINT((ndo, "\n\t    %s (%u)",
940                tok2str(ospf_lls_tlv_values,"Unknown TLV",lls_type),
941                lls_type));
942         dptr += 2;
943         ND_TCHECK2(*dptr, 2);
944         lls_len = EXTRACT_16BITS(dptr);
945         ND_PRINT((ndo, ", length: %u", lls_len));
946         dptr += 2;
947         switch (lls_type) {
948 
949         case OSPF_LLS_EO:
950             if (lls_len != 4) {
951                 ND_PRINT((ndo, " [should be 4]"));
952                 lls_len = 4;
953             }
954             ND_TCHECK2(*dptr, 4);
955             lls_flags = EXTRACT_32BITS(dptr);
956             ND_PRINT((ndo, "\n\t      Options: 0x%08x [%s]", lls_flags,
957                    bittok2str(ospf_lls_eo_options, "?", lls_flags)));
958 
959             break;
960 
961         case OSPF_LLS_MD5:
962             if (lls_len != 20) {
963                 ND_PRINT((ndo, " [should be 20]"));
964                 lls_len = 20;
965             }
966             ND_TCHECK2(*dptr, 4);
967             ND_PRINT((ndo, "\n\t      Sequence number: 0x%08x", EXTRACT_32BITS(dptr)));
968             break;
969         }
970 
971         dptr += lls_len;
972     }
973 
974     return (0);
975 trunc:
976     return (1);
977 }
978 
979 static int
ospf_decode_v2(netdissect_options * ndo,register const struct ospfhdr * op,register const u_char * dataend)980 ospf_decode_v2(netdissect_options *ndo,
981                register const struct ospfhdr *op, register const u_char *dataend)
982 {
983 	register const struct in_addr *ap;
984 	register const struct lsr *lsrp;
985 	register const struct lsa_hdr *lshp;
986 	register const struct lsa *lsap;
987 	register uint32_t lsa_count,lsa_count_max;
988 
989 	switch (op->ospf_type) {
990 
991 	case OSPF_TYPE_UMD:
992 		/*
993 		 * Rob Coltun's special monitoring packets;
994 		 * do nothing
995 		 */
996 		break;
997 
998 	case OSPF_TYPE_HELLO:
999 		ND_TCHECK(op->ospf_hello.hello_options);
1000 		ND_PRINT((ndo, "\n\tOptions [%s]",
1001 		          bittok2str(ospf_option_values,"none",op->ospf_hello.hello_options)));
1002 
1003 		ND_TCHECK(op->ospf_hello.hello_deadint);
1004 		ND_PRINT((ndo, "\n\t  Hello Timer %us, Dead Timer %us, Mask %s, Priority %u",
1005 		          EXTRACT_16BITS(&op->ospf_hello.hello_helloint),
1006 		          EXTRACT_32BITS(&op->ospf_hello.hello_deadint),
1007 		          ipaddr_string(ndo, &op->ospf_hello.hello_mask),
1008 		          op->ospf_hello.hello_priority));
1009 
1010 		ND_TCHECK(op->ospf_hello.hello_dr);
1011 		if (op->ospf_hello.hello_dr.s_addr != 0)
1012 			ND_PRINT((ndo, "\n\t  Designated Router %s",
1013 			    ipaddr_string(ndo, &op->ospf_hello.hello_dr)));
1014 
1015 		ND_TCHECK(op->ospf_hello.hello_bdr);
1016 		if (op->ospf_hello.hello_bdr.s_addr != 0)
1017 			ND_PRINT((ndo, ", Backup Designated Router %s",
1018 			          ipaddr_string(ndo, &op->ospf_hello.hello_bdr)));
1019 
1020 		ap = op->ospf_hello.hello_neighbor;
1021 		if ((const u_char *)ap < dataend)
1022 			ND_PRINT((ndo, "\n\t  Neighbor List:"));
1023 		while ((const u_char *)ap < dataend) {
1024 			ND_TCHECK(*ap);
1025 			ND_PRINT((ndo, "\n\t    %s", ipaddr_string(ndo, ap)));
1026 			++ap;
1027 		}
1028 		break;	/* HELLO */
1029 
1030 	case OSPF_TYPE_DD:
1031 		ND_TCHECK(op->ospf_db.db_options);
1032 		ND_PRINT((ndo, "\n\tOptions [%s]",
1033 		          bittok2str(ospf_option_values, "none", op->ospf_db.db_options)));
1034 		ND_TCHECK(op->ospf_db.db_flags);
1035 		ND_PRINT((ndo, ", DD Flags [%s]",
1036 		          bittok2str(ospf_dd_flag_values, "none", op->ospf_db.db_flags)));
1037 		ND_TCHECK(op->ospf_db.db_ifmtu);
1038 		if (op->ospf_db.db_ifmtu) {
1039 			ND_PRINT((ndo, ", MTU: %u", EXTRACT_16BITS(&op->ospf_db.db_ifmtu)));
1040 		}
1041 		ND_TCHECK(op->ospf_db.db_seq);
1042 		ND_PRINT((ndo, ", Sequence: 0x%08x", EXTRACT_32BITS(&op->ospf_db.db_seq)));
1043 
1044 		/* Print all the LS adv's */
1045 		lshp = op->ospf_db.db_lshdr;
1046 		while (((const u_char *)lshp < dataend) && ospf_print_lshdr(ndo, lshp) != -1) {
1047 			++lshp;
1048 		}
1049 		break;
1050 
1051 	case OSPF_TYPE_LS_REQ:
1052                 lsrp = op->ospf_lsr;
1053                 while ((const u_char *)lsrp < dataend) {
1054                     ND_TCHECK(*lsrp);
1055 
1056                     ND_PRINT((ndo, "\n\t  Advertising Router: %s, %s LSA (%u)",
1057                            ipaddr_string(ndo, &lsrp->ls_router),
1058                            tok2str(lsa_values,"unknown",EXTRACT_32BITS(lsrp->ls_type)),
1059                            EXTRACT_32BITS(&lsrp->ls_type)));
1060 
1061                     switch (EXTRACT_32BITS(lsrp->ls_type)) {
1062                         /* the LSA header for opaque LSAs was slightly changed */
1063                     case LS_TYPE_OPAQUE_LL:
1064                     case LS_TYPE_OPAQUE_AL:
1065                     case LS_TYPE_OPAQUE_DW:
1066                         ND_PRINT((ndo, ", Opaque-Type: %s LSA (%u), Opaque-ID: %u",
1067                                tok2str(lsa_opaque_values, "unknown",lsrp->un_ls_stateid.opaque_field.opaque_type),
1068                                lsrp->un_ls_stateid.opaque_field.opaque_type,
1069                                EXTRACT_24BITS(&lsrp->un_ls_stateid.opaque_field.opaque_id)));
1070                         break;
1071                     default:
1072                         ND_PRINT((ndo, ", LSA-ID: %s",
1073                                ipaddr_string(ndo, &lsrp->un_ls_stateid.ls_stateid)));
1074                         break;
1075                     }
1076 
1077                     ++lsrp;
1078                 }
1079 		break;
1080 
1081 	case OSPF_TYPE_LS_UPDATE:
1082                 lsap = op->ospf_lsu.lsu_lsa;
1083                 ND_TCHECK(op->ospf_lsu.lsu_count);
1084                 lsa_count_max = EXTRACT_32BITS(&op->ospf_lsu.lsu_count);
1085                 ND_PRINT((ndo, ", %d LSA%s", lsa_count_max, PLURAL_SUFFIX(lsa_count_max)));
1086                 for (lsa_count=1;lsa_count <= lsa_count_max;lsa_count++) {
1087                     ND_PRINT((ndo, "\n\t  LSA #%u", lsa_count));
1088                         lsap = (const struct lsa *)ospf_print_lsa(ndo, lsap);
1089                         if (lsap == NULL)
1090                                 goto trunc;
1091                 }
1092 		break;
1093 
1094 	case OSPF_TYPE_LS_ACK:
1095                 lshp = op->ospf_lsa.lsa_lshdr;
1096                 while (ospf_print_lshdr(ndo, lshp) != -1) {
1097                     ++lshp;
1098                 }
1099                 break;
1100 
1101 	default:
1102 		break;
1103 	}
1104 	return (0);
1105 trunc:
1106 	return (1);
1107 }
1108 
1109 void
ospf_print(netdissect_options * ndo,register const u_char * bp,register u_int length,const u_char * bp2 _U_)1110 ospf_print(netdissect_options *ndo,
1111            register const u_char *bp, register u_int length,
1112            const u_char *bp2 _U_)
1113 {
1114 	register const struct ospfhdr *op;
1115 	register const u_char *dataend;
1116 	register const char *cp;
1117 
1118 	op = (const struct ospfhdr *)bp;
1119 
1120 	/* XXX Before we do anything else, strip off the MD5 trailer */
1121 	ND_TCHECK(op->ospf_authtype);
1122 	if (EXTRACT_16BITS(&op->ospf_authtype) == OSPF_AUTH_MD5) {
1123 		length -= OSPF_AUTH_MD5_LEN;
1124 		ndo->ndo_snapend -= OSPF_AUTH_MD5_LEN;
1125 	}
1126 
1127 	/* If the type is valid translate it, or just print the type */
1128 	/* value.  If it's not valid, say so and return */
1129 	ND_TCHECK(op->ospf_type);
1130 	cp = tok2str(type2str, "unknown LS-type", op->ospf_type);
1131 	ND_PRINT((ndo, "OSPFv%u, %s, length %u", op->ospf_version, cp, length));
1132 	if (*cp == 'u')
1133 		return;
1134 
1135 	if (!ndo->ndo_vflag) { /* non verbose - so lets bail out here */
1136 		return;
1137 	}
1138 
1139 	ND_TCHECK(op->ospf_len);
1140 	if (length != EXTRACT_16BITS(&op->ospf_len)) {
1141 		ND_PRINT((ndo, " [len %d]", EXTRACT_16BITS(&op->ospf_len)));
1142 	}
1143 
1144 	if (length > EXTRACT_16BITS(&op->ospf_len)) {
1145 		dataend = bp + EXTRACT_16BITS(&op->ospf_len);
1146 	} else {
1147 		dataend = bp + length;
1148 	}
1149 
1150 	ND_TCHECK(op->ospf_routerid);
1151 	ND_PRINT((ndo, "\n\tRouter-ID %s", ipaddr_string(ndo, &op->ospf_routerid)));
1152 
1153 	ND_TCHECK(op->ospf_areaid);
1154 	if (op->ospf_areaid.s_addr != 0)
1155 		ND_PRINT((ndo, ", Area %s", ipaddr_string(ndo, &op->ospf_areaid)));
1156 	else
1157 		ND_PRINT((ndo, ", Backbone Area"));
1158 
1159 	if (ndo->ndo_vflag) {
1160 		/* Print authentication data (should we really do this?) */
1161 		ND_TCHECK2(op->ospf_authdata[0], sizeof(op->ospf_authdata));
1162 
1163 		ND_PRINT((ndo, ", Authentication Type: %s (%u)",
1164 		          tok2str(ospf_authtype_values, "unknown", EXTRACT_16BITS(&op->ospf_authtype)),
1165 		          EXTRACT_16BITS(&op->ospf_authtype)));
1166 
1167 		switch (EXTRACT_16BITS(&op->ospf_authtype)) {
1168 
1169 		case OSPF_AUTH_NONE:
1170 			break;
1171 
1172 		case OSPF_AUTH_SIMPLE:
1173 			ND_PRINT((ndo, "\n\tSimple text password: "));
1174 			safeputs(ndo, op->ospf_authdata, OSPF_AUTH_SIMPLE_LEN);
1175 			break;
1176 
1177 		case OSPF_AUTH_MD5:
1178 			ND_PRINT((ndo, "\n\tKey-ID: %u, Auth-Length: %u, Crypto Sequence Number: 0x%08x",
1179 			          *((op->ospf_authdata) + 2),
1180 			          *((op->ospf_authdata) + 3),
1181 			          EXTRACT_32BITS((op->ospf_authdata) + 4)));
1182 			break;
1183 
1184 		default:
1185 			return;
1186 		}
1187 	}
1188 	/* Do rest according to version.	 */
1189 	switch (op->ospf_version) {
1190 
1191 	case 2:
1192 		/* ospf version 2 */
1193 		if (ospf_decode_v2(ndo, op, dataend))
1194 			goto trunc;
1195 		if (length > EXTRACT_16BITS(&op->ospf_len)) {
1196 			if (ospf_decode_lls(ndo, op, length))
1197 				goto trunc;
1198 		}
1199 		break;
1200 
1201 	default:
1202 		ND_PRINT((ndo, " ospf [version %d]", op->ospf_version));
1203 		break;
1204 	}			/* end switch on version */
1205 
1206 	return;
1207 trunc:
1208 	ND_PRINT((ndo, "%s", tstr));
1209 }
1210