xref: /freebsd/contrib/tcpdump/print-eigrp.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*
2  * Copyright (c) 1998-2004  Hannes Gredler <hannes@tcpdump.org>
3  *      The TCPDUMP project
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that: (1) source code
7  * distributions retain the above copyright notice and this paragraph
8  * in its entirety, and (2) distributions including binary code include
9  * the above copyright notice and this paragraph in its entirety in
10  * the documentation or other materials provided with the distribution.
11  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
12  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
13  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
14  * FOR A PARTICULAR PURPOSE.
15  */
16 
17 #ifndef lint
18 static const char rcsid[] _U_ =
19     "@(#) $Header: /tcpdump/master/tcpdump/print-eigrp.c,v 1.5.2.2 2005/05/06 02:53:41 guy Exp $";
20 #endif
21 
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25 
26 #include <tcpdump-stdinc.h>
27 
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31 
32 #include "interface.h"
33 #include "extract.h"
34 #include "addrtoname.h"
35 
36 /*
37  * packet format documented at
38  * http://www.rhyshaden.com/eigrp.htm
39  */
40 
41 struct eigrp_common_header {
42     u_int8_t version;
43     u_int8_t opcode;
44     u_int8_t checksum[2];
45     u_int8_t flags[4];
46     u_int8_t seq[4];
47     u_int8_t ack[4];
48     u_int8_t asn[4];
49 };
50 
51 #define	EIGRP_VERSION                        2
52 
53 #define	EIGRP_OPCODE_UPDATE                  1
54 #define	EIGRP_OPCODE_QUERY                   3
55 #define	EIGRP_OPCODE_REPLY                   4
56 #define	EIGRP_OPCODE_HELLO                   5
57 #define	EIGRP_OPCODE_IPXSAP                  6
58 #define	EIGRP_OPCODE_PROBE                   7
59 
60 static const struct tok eigrp_opcode_values[] = {
61     { EIGRP_OPCODE_UPDATE, "Update" },
62     { EIGRP_OPCODE_QUERY, "Query" },
63     { EIGRP_OPCODE_REPLY, "Reply" },
64     { EIGRP_OPCODE_HELLO, "Hello" },
65     { EIGRP_OPCODE_IPXSAP, "IPX SAP" },
66     { EIGRP_OPCODE_PROBE, "Probe" },
67     { 0, NULL}
68 };
69 
70 static const struct tok eigrp_common_header_flag_values[] = {
71     { 0x01, "Init" },
72     { 0x02, "Conditionally Received" },
73     { 0, NULL}
74 };
75 
76 struct eigrp_tlv_header {
77     u_int8_t type[2];
78     u_int8_t length[2];
79 };
80 
81 #define EIGRP_TLV_GENERAL_PARM   0x0001
82 #define EIGRP_TLV_AUTH           0x0002
83 #define EIGRP_TLV_SEQ            0x0003
84 #define EIGRP_TLV_SW_VERSION     0x0004
85 #define EIGRP_TLV_MCAST_SEQ      0x0005
86 #define EIGRP_TLV_IP_INT         0x0102
87 #define EIGRP_TLV_IP_EXT         0x0103
88 #define EIGRP_TLV_AT_INT         0x0202
89 #define EIGRP_TLV_AT_EXT         0x0203
90 #define EIGRP_TLV_AT_CABLE_SETUP 0x0204
91 #define EIGRP_TLV_IPX_INT        0x0302
92 #define EIGRP_TLV_IPX_EXT        0x0303
93 
94 static const struct tok eigrp_tlv_values[] = {
95     { EIGRP_TLV_GENERAL_PARM, "General Parameters"},
96     { EIGRP_TLV_AUTH, "Authentication"},
97     { EIGRP_TLV_SEQ, "Sequence"},
98     { EIGRP_TLV_SW_VERSION, "Software Version"},
99     { EIGRP_TLV_MCAST_SEQ, "Next Multicast Sequence"},
100     { EIGRP_TLV_IP_INT, "IP Internal routes"},
101     { EIGRP_TLV_IP_EXT, "IP External routes"},
102     { EIGRP_TLV_AT_INT, "AppleTalk Internal routes"},
103     { EIGRP_TLV_AT_EXT, "AppleTalk External routes"},
104     { EIGRP_TLV_AT_CABLE_SETUP, "AppleTalk Cable setup"},
105     { EIGRP_TLV_IPX_INT, "IPX Internal routes"},
106     { EIGRP_TLV_IPX_EXT, "IPX External routes"},
107     { 0, NULL}
108 };
109 
110 struct eigrp_tlv_general_parm_t {
111     u_int8_t k1;
112     u_int8_t k2;
113     u_int8_t k3;
114     u_int8_t k4;
115     u_int8_t k5;
116     u_int8_t res;
117     u_int8_t holdtime[2];
118 };
119 
120 struct eigrp_tlv_sw_version_t {
121     u_int8_t ios_major;
122     u_int8_t ios_minor;
123     u_int8_t eigrp_major;
124     u_int8_t eigrp_minor;
125 };
126 
127 struct eigrp_tlv_ip_int_t {
128     u_int8_t nexthop[4];
129     u_int8_t delay[4];
130     u_int8_t bandwidth[4];
131     u_int8_t mtu[3];
132     u_int8_t hopcount;
133     u_int8_t reliability;
134     u_int8_t load;
135     u_int8_t reserved[2];
136     u_int8_t plen;
137     u_int8_t destination; /* variable length [1-4] bytes encoding */
138 };
139 
140 struct eigrp_tlv_ip_ext_t {
141     u_int8_t nexthop[4];
142     u_int8_t origin_router[4];
143     u_int8_t origin_as[4];
144     u_int8_t tag[4];
145     u_int8_t metric[4];
146     u_int8_t reserved[2];
147     u_int8_t proto_id;
148     u_int8_t flags;
149     u_int8_t delay[4];
150     u_int8_t bandwidth[4];
151     u_int8_t mtu[3];
152     u_int8_t hopcount;
153     u_int8_t reliability;
154     u_int8_t load;
155     u_int8_t reserved2[2];
156     u_int8_t plen;
157     u_int8_t destination; /* variable length [1-4] bytes encoding */
158 };
159 
160 struct eigrp_tlv_at_cable_setup_t {
161     u_int8_t cable_start[2];
162     u_int8_t cable_end[2];
163     u_int8_t router_id[4];
164 };
165 
166 struct eigrp_tlv_at_int_t {
167     u_int8_t nexthop[4];
168     u_int8_t delay[4];
169     u_int8_t bandwidth[4];
170     u_int8_t mtu[3];
171     u_int8_t hopcount;
172     u_int8_t reliability;
173     u_int8_t load;
174     u_int8_t reserved[2];
175     u_int8_t cable_start[2];
176     u_int8_t cable_end[2];
177 };
178 
179 struct eigrp_tlv_at_ext_t {
180     u_int8_t nexthop[4];
181     u_int8_t origin_router[4];
182     u_int8_t origin_as[4];
183     u_int8_t tag[4];
184     u_int8_t proto_id;
185     u_int8_t flags;
186     u_int8_t metric[2];
187     u_int8_t delay[4];
188     u_int8_t bandwidth[4];
189     u_int8_t mtu[3];
190     u_int8_t hopcount;
191     u_int8_t reliability;
192     u_int8_t load;
193     u_int8_t reserved2[2];
194     u_int8_t cable_start[2];
195     u_int8_t cable_end[2];
196 };
197 
198 static const struct tok eigrp_ext_proto_id_values[] = {
199     { 0x01, "IGRP" },
200     { 0x02, "EIGRP" },
201     { 0x03, "Static" },
202     { 0x04, "RIP" },
203     { 0x05, "Hello" },
204     { 0x06, "OSPF" },
205     { 0x07, "IS-IS" },
206     { 0x08, "EGP" },
207     { 0x09, "BGP" },
208     { 0x0a, "IDRP" },
209     { 0x0b, "Connected" },
210     { 0, NULL}
211 };
212 
213 void
214 eigrp_print(register const u_char *pptr, register u_int len) {
215 
216     const struct eigrp_common_header *eigrp_com_header;
217     const struct eigrp_tlv_header *eigrp_tlv_header;
218     const u_char *tptr,*tlv_tptr;
219     u_int tlen,eigrp_tlv_len,eigrp_tlv_type,tlv_tlen, byte_length, bit_length;
220     u_int8_t prefix[4];
221 
222     union {
223         const struct eigrp_tlv_general_parm_t *eigrp_tlv_general_parm;
224         const struct eigrp_tlv_sw_version_t *eigrp_tlv_sw_version;
225         const struct eigrp_tlv_ip_int_t *eigrp_tlv_ip_int;
226         const struct eigrp_tlv_ip_ext_t *eigrp_tlv_ip_ext;
227         const struct eigrp_tlv_at_cable_setup_t *eigrp_tlv_at_cable_setup;
228         const struct eigrp_tlv_at_int_t *eigrp_tlv_at_int;
229         const struct eigrp_tlv_at_ext_t *eigrp_tlv_at_ext;
230     } tlv_ptr;
231 
232     tptr=pptr;
233     eigrp_com_header = (const struct eigrp_common_header *)pptr;
234     TCHECK(*eigrp_com_header);
235 
236     /*
237      * Sanity checking of the header.
238      */
239     if (eigrp_com_header->version != EIGRP_VERSION) {
240 	printf("EIGRP version %u packet not supported",eigrp_com_header->version);
241 	return;
242     }
243 
244     /* in non-verbose mode just lets print the basic Message Type*/
245     if (vflag < 1) {
246         printf("EIGRP %s, length: %u",
247                tok2str(eigrp_opcode_values, "unknown (%u)",eigrp_com_header->opcode),
248                len);
249         return;
250     }
251 
252     /* ok they seem to want to know everything - lets fully decode it */
253 
254     tlen=len-sizeof(struct eigrp_common_header);
255 
256     /* FIXME print other header info */
257     printf("\n\tEIGRP v%u, opcode: %s (%u), chksum: 0x%04x, Flags: [%s]\n\tseq: 0x%08x, ack: 0x%08x, AS: %u, length: %u",
258            eigrp_com_header->version,
259            tok2str(eigrp_opcode_values, "unknown, type: %u",eigrp_com_header->opcode),
260            eigrp_com_header->opcode,
261            EXTRACT_16BITS(&eigrp_com_header->checksum),
262            tok2str(eigrp_common_header_flag_values,
263                    "none",
264                    EXTRACT_32BITS(&eigrp_com_header->flags)),
265            EXTRACT_32BITS(&eigrp_com_header->seq),
266            EXTRACT_32BITS(&eigrp_com_header->ack),
267            EXTRACT_32BITS(&eigrp_com_header->asn),
268            tlen);
269 
270     tptr+=sizeof(const struct eigrp_common_header);
271 
272     while(tlen>0) {
273         /* did we capture enough for fully decoding the object header ? */
274         TCHECK2(*tptr, sizeof(struct eigrp_tlv_header));
275 
276         eigrp_tlv_header = (const struct eigrp_tlv_header *)tptr;
277         eigrp_tlv_len=EXTRACT_16BITS(&eigrp_tlv_header->length);
278         eigrp_tlv_type=EXTRACT_16BITS(&eigrp_tlv_header->type);
279 
280 
281         if (eigrp_tlv_len < sizeof(struct eigrp_tlv_header) ||
282             eigrp_tlv_len > tlen) {
283             print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t    ",tlen);
284             return;
285         }
286 
287         printf("\n\t  %s TLV (0x%04x), length: %u",
288                tok2str(eigrp_tlv_values,
289                        "Unknown",
290                        eigrp_tlv_type),
291                eigrp_tlv_type,
292                eigrp_tlv_len);
293 
294         tlv_tptr=tptr+sizeof(struct eigrp_tlv_header);
295         tlv_tlen=eigrp_tlv_len-sizeof(struct eigrp_tlv_header);
296 
297         /* did we capture enough for fully decoding the object ? */
298         TCHECK2(*tptr, eigrp_tlv_len);
299 
300         switch(eigrp_tlv_type) {
301 
302         case EIGRP_TLV_GENERAL_PARM:
303             tlv_ptr.eigrp_tlv_general_parm = (const struct eigrp_tlv_general_parm_t *)tlv_tptr;
304 
305             printf("\n\t    holdtime: %us, k1 %u, k2 %u, k3 %u, k4 %u, k5 %u",
306                    EXTRACT_16BITS(tlv_ptr.eigrp_tlv_general_parm->holdtime),
307                    tlv_ptr.eigrp_tlv_general_parm->k1,
308                    tlv_ptr.eigrp_tlv_general_parm->k2,
309                    tlv_ptr.eigrp_tlv_general_parm->k3,
310                    tlv_ptr.eigrp_tlv_general_parm->k4,
311                    tlv_ptr.eigrp_tlv_general_parm->k5);
312             break;
313 
314         case EIGRP_TLV_SW_VERSION:
315             tlv_ptr.eigrp_tlv_sw_version = (const struct eigrp_tlv_sw_version_t *)tlv_tptr;
316 
317             printf("\n\t    IOS version: %u.%u, EIGRP version %u.%u",
318                    tlv_ptr.eigrp_tlv_sw_version->ios_major,
319                    tlv_ptr.eigrp_tlv_sw_version->ios_minor,
320                    tlv_ptr.eigrp_tlv_sw_version->eigrp_major,
321                    tlv_ptr.eigrp_tlv_sw_version->eigrp_minor);
322             break;
323 
324         case EIGRP_TLV_IP_INT:
325             tlv_ptr.eigrp_tlv_ip_int = (const struct eigrp_tlv_ip_int_t *)tlv_tptr;
326 
327             bit_length = tlv_ptr.eigrp_tlv_ip_int->plen;
328             if (bit_length > 32) {
329                 printf("\n\t    illegal prefix length %u",bit_length);
330                 break;
331             }
332             byte_length = (bit_length + 7) / 8; /* variable length encoding */
333             memset(prefix, 0, 4);
334             memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_int->destination,byte_length);
335 
336             printf("\n\t    IPv4 prefix: %15s/%u, nexthop: ",
337                    ipaddr_string(prefix),
338                    bit_length);
339             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->nexthop) == 0)
340                 printf("self");
341             else
342                 printf("%s",ipaddr_string(&tlv_ptr.eigrp_tlv_ip_int->nexthop));
343 
344             printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
345                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->delay)/100),
346                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_int->bandwidth),
347                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_int->mtu),
348                    tlv_ptr.eigrp_tlv_ip_int->hopcount,
349                    tlv_ptr.eigrp_tlv_ip_int->reliability,
350                    tlv_ptr.eigrp_tlv_ip_int->load);
351             break;
352 
353         case EIGRP_TLV_IP_EXT:
354             tlv_ptr.eigrp_tlv_ip_ext = (const struct eigrp_tlv_ip_ext_t *)tlv_tptr;
355 
356             bit_length = tlv_ptr.eigrp_tlv_ip_ext->plen;
357             if (bit_length > 32) {
358                 printf("\n\t    illegal prefix length %u",bit_length);
359                 break;
360             }
361             byte_length = (bit_length + 7) / 8; /* variable length encoding */
362             memset(prefix, 0, 4);
363             memcpy(prefix,&tlv_ptr.eigrp_tlv_ip_ext->destination,byte_length);
364 
365             printf("\n\t    IPv4 prefix: %15s/%u, nexthop: ",
366                    ipaddr_string(prefix),
367                    bit_length);
368             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->nexthop) == 0)
369                 printf("self");
370             else
371                 printf("%s",ipaddr_string(&tlv_ptr.eigrp_tlv_ip_ext->nexthop));
372 
373             printf("\n\t      origin-router %s, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
374                    ipaddr_string(tlv_ptr.eigrp_tlv_ip_ext->origin_router),
375                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->origin_as),
376                    tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_ip_ext->proto_id),
377                    tlv_ptr.eigrp_tlv_ip_ext->flags,
378                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->tag),
379                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_ip_ext->metric));
380 
381             printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
382                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->delay)/100),
383                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_ip_ext->bandwidth),
384                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_ip_ext->mtu),
385                    tlv_ptr.eigrp_tlv_ip_ext->hopcount,
386                    tlv_ptr.eigrp_tlv_ip_ext->reliability,
387                    tlv_ptr.eigrp_tlv_ip_ext->load);
388             break;
389 
390         case EIGRP_TLV_AT_CABLE_SETUP:
391             tlv_ptr.eigrp_tlv_at_cable_setup = (const struct eigrp_tlv_at_cable_setup_t *)tlv_tptr;
392 
393             printf("\n\t    Cable-range: %u-%u, Router-ID %u",
394                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_start),
395                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->cable_end),
396                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_cable_setup->router_id));
397             break;
398 
399         case EIGRP_TLV_AT_INT:
400             tlv_ptr.eigrp_tlv_at_int = (const struct eigrp_tlv_at_int_t *)tlv_tptr;
401 
402             printf("\n\t     Cable-Range: %u-%u, nexthop: ",
403                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_start),
404                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->cable_end));
405 
406             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop) == 0)
407                 printf("self");
408             else
409                 printf("%u.%u",
410                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop),
411                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_int->nexthop[2]));
412 
413             printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
414                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->delay)/100),
415                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_int->bandwidth),
416                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_int->mtu),
417                    tlv_ptr.eigrp_tlv_at_int->hopcount,
418                    tlv_ptr.eigrp_tlv_at_int->reliability,
419                    tlv_ptr.eigrp_tlv_at_int->load);
420             break;
421 
422         case EIGRP_TLV_AT_EXT:
423             tlv_ptr.eigrp_tlv_at_ext = (const struct eigrp_tlv_at_ext_t *)tlv_tptr;
424 
425             printf("\n\t     Cable-Range: %u-%u, nexthop: ",
426                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_start),
427                    EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->cable_end));
428 
429             if (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop) == 0)
430                 printf("self");
431             else
432                 printf("%u.%u",
433                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop),
434                        EXTRACT_16BITS(&tlv_ptr.eigrp_tlv_at_ext->nexthop[2]));
435 
436             printf("\n\t      origin-router %u, origin-as %u, origin-proto %s, flags [0x%02x], tag 0x%08x, metric %u",
437                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_router),
438                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->origin_as),
439                    tok2str(eigrp_ext_proto_id_values,"unknown",tlv_ptr.eigrp_tlv_at_ext->proto_id),
440                    tlv_ptr.eigrp_tlv_at_ext->flags,
441                    EXTRACT_32BITS(tlv_ptr.eigrp_tlv_at_ext->tag),
442                    EXTRACT_16BITS(tlv_ptr.eigrp_tlv_at_ext->metric));
443 
444             printf("\n\t      delay %u ms, bandwidth %u Kbps, mtu %u, hop %u, reliability %u, load %u",
445                    (EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->delay)/100),
446                    EXTRACT_32BITS(&tlv_ptr.eigrp_tlv_at_ext->bandwidth),
447                    EXTRACT_24BITS(&tlv_ptr.eigrp_tlv_at_ext->mtu),
448                    tlv_ptr.eigrp_tlv_at_ext->hopcount,
449                    tlv_ptr.eigrp_tlv_at_ext->reliability,
450                    tlv_ptr.eigrp_tlv_at_ext->load);
451             break;
452 
453             /*
454              * FIXME those are the defined TLVs that lack a decoder
455              * you are welcome to contribute code ;-)
456              */
457 
458         case EIGRP_TLV_AUTH:
459         case EIGRP_TLV_SEQ:
460         case EIGRP_TLV_MCAST_SEQ:
461         case EIGRP_TLV_IPX_INT:
462         case EIGRP_TLV_IPX_EXT:
463 
464         default:
465             if (vflag <= 1)
466                 print_unknown_data(tlv_tptr,"\n\t    ",tlv_tlen);
467             break;
468         }
469         /* do we want to see an additionally hexdump ? */
470         if (vflag > 1)
471             print_unknown_data(tptr+sizeof(sizeof(struct eigrp_tlv_header)),"\n\t    ",
472                                eigrp_tlv_len-sizeof(struct eigrp_tlv_header));
473 
474         tptr+=eigrp_tlv_len;
475         tlen-=eigrp_tlv_len;
476     }
477     return;
478 trunc:
479     printf("\n\t\t packet exceeded snapshot");
480 }
481