141c99275SPeter Avalos /*
241c99275SPeter Avalos * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
341c99275SPeter Avalos * The Regents of the University of California. All rights reserved.
441c99275SPeter Avalos *
541c99275SPeter Avalos * Redistribution and use in source and binary forms, with or without
641c99275SPeter Avalos * modification, are permitted provided that: (1) source code distributions
741c99275SPeter Avalos * retain the above copyright notice and this paragraph in its entirety, (2)
841c99275SPeter Avalos * distributions including binary code include the above copyright notice and
941c99275SPeter Avalos * this paragraph in its entirety in the documentation or other materials
1041c99275SPeter Avalos * provided with the distribution, and (3) all advertising materials mentioning
1141c99275SPeter Avalos * features or use of this software display the following acknowledgement:
1241c99275SPeter Avalos * ``This product includes software developed by the University of California,
1341c99275SPeter Avalos * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
1441c99275SPeter Avalos * the University nor the names of its contributors may be used to endorse
1541c99275SPeter Avalos * or promote products derived from this software without specific prior
1641c99275SPeter Avalos * written permission.
1741c99275SPeter Avalos * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
1841c99275SPeter Avalos * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
1941c99275SPeter Avalos * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
2041c99275SPeter Avalos *
2141c99275SPeter Avalos * Code by Gert Doering, SpaceNet GmbH, gert@space.net
2241c99275SPeter Avalos *
2341c99275SPeter Avalos * Reference documentation:
24*ed775ee7SAntonio Huete Jimenez * https://web.archive.org/web/20000914194913/http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.pdf
2541c99275SPeter Avalos */
2641c99275SPeter Avalos
27411677aeSAaron LI /* \summary: Cisco Discovery Protocol (CDP) printer */
2841c99275SPeter Avalos
2941c99275SPeter Avalos #ifdef HAVE_CONFIG_H
30*ed775ee7SAntonio Huete Jimenez #include <config.h>
3141c99275SPeter Avalos #endif
3241c99275SPeter Avalos
33*ed775ee7SAntonio Huete Jimenez #include "netdissect-stdinc.h"
3441c99275SPeter Avalos
3541c99275SPeter Avalos #include <string.h>
3641c99275SPeter Avalos
37*ed775ee7SAntonio Huete Jimenez #define ND_LONGJMP_FROM_TCHECK
38411677aeSAaron LI #include "netdissect.h"
3941c99275SPeter Avalos #include "addrtoname.h"
40411677aeSAaron LI #include "extract.h"
4141c99275SPeter Avalos #include "nlpid.h"
4241c99275SPeter Avalos
4341c99275SPeter Avalos
44411677aeSAaron LI #define CDP_HEADER_LEN 4
45411677aeSAaron LI #define CDP_HEADER_VERSION_OFFSET 0
46411677aeSAaron LI #define CDP_HEADER_TTL_OFFSET 1
47411677aeSAaron LI #define CDP_HEADER_CHECKSUM_OFFSET 2
48411677aeSAaron LI
49411677aeSAaron LI #define CDP_TLV_HEADER_LEN 4
50411677aeSAaron LI #define CDP_TLV_TYPE_OFFSET 0
51411677aeSAaron LI #define CDP_TLV_LEN_OFFSET 2
52411677aeSAaron LI
53411677aeSAaron LI static const struct tok cdp_capability_values[] = {
5441c99275SPeter Avalos { 0x01, "Router" },
5541c99275SPeter Avalos { 0x02, "Transparent Bridge" },
5641c99275SPeter Avalos { 0x04, "Source Route Bridge" },
5741c99275SPeter Avalos { 0x08, "L2 Switch" },
5841c99275SPeter Avalos { 0x10, "L3 capable" },
5941c99275SPeter Avalos { 0x20, "IGMP snooping" },
6041c99275SPeter Avalos { 0x40, "L1 capable" },
6141c99275SPeter Avalos { 0, NULL }
6241c99275SPeter Avalos };
6341c99275SPeter Avalos
64*ed775ee7SAntonio Huete Jimenez static void cdp_print_addr(netdissect_options *, const u_char *, u_int);
65*ed775ee7SAntonio Huete Jimenez static void cdp_print_prefixes(netdissect_options *, const u_char *, u_int);
66*ed775ee7SAntonio Huete Jimenez
67*ed775ee7SAntonio Huete Jimenez static void
cdp_print_string(netdissect_options * ndo,const u_char * cp,const u_int len)68*ed775ee7SAntonio Huete Jimenez cdp_print_string(netdissect_options *ndo,
69*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len)
70*ed775ee7SAntonio Huete Jimenez {
71*ed775ee7SAntonio Huete Jimenez ND_PRINT("'");
72*ed775ee7SAntonio Huete Jimenez (void)nd_printn(ndo, cp, len, NULL);
73*ed775ee7SAntonio Huete Jimenez ND_PRINT("'");
74*ed775ee7SAntonio Huete Jimenez }
75*ed775ee7SAntonio Huete Jimenez
76*ed775ee7SAntonio Huete Jimenez static void
cdp_print_power(netdissect_options * ndo,const u_char * cp,const u_int len)77*ed775ee7SAntonio Huete Jimenez cdp_print_power(netdissect_options *ndo,
78*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len)
79*ed775ee7SAntonio Huete Jimenez {
80*ed775ee7SAntonio Huete Jimenez u_int val = 0;
81*ed775ee7SAntonio Huete Jimenez
82*ed775ee7SAntonio Huete Jimenez switch (len) {
83*ed775ee7SAntonio Huete Jimenez case 1:
84*ed775ee7SAntonio Huete Jimenez val = GET_U_1(cp);
85*ed775ee7SAntonio Huete Jimenez break;
86*ed775ee7SAntonio Huete Jimenez case 2:
87*ed775ee7SAntonio Huete Jimenez val = GET_BE_U_2(cp);
88*ed775ee7SAntonio Huete Jimenez break;
89*ed775ee7SAntonio Huete Jimenez case 3:
90*ed775ee7SAntonio Huete Jimenez val = GET_BE_U_3(cp);
91*ed775ee7SAntonio Huete Jimenez break;
92*ed775ee7SAntonio Huete Jimenez }
93*ed775ee7SAntonio Huete Jimenez ND_PRINT("%1.2fW", val / 1000.0);
94*ed775ee7SAntonio Huete Jimenez }
95*ed775ee7SAntonio Huete Jimenez
96*ed775ee7SAntonio Huete Jimenez static void
cdp_print_capability(netdissect_options * ndo,const u_char * cp,const u_int len _U_)97*ed775ee7SAntonio Huete Jimenez cdp_print_capability(netdissect_options *ndo,
98*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len _U_)
99*ed775ee7SAntonio Huete Jimenez {
100*ed775ee7SAntonio Huete Jimenez uint32_t val = GET_BE_U_4(cp);
101*ed775ee7SAntonio Huete Jimenez
102*ed775ee7SAntonio Huete Jimenez ND_PRINT("(0x%08x): %s", val,
103*ed775ee7SAntonio Huete Jimenez bittok2str(cdp_capability_values, "none", val));
104*ed775ee7SAntonio Huete Jimenez }
105*ed775ee7SAntonio Huete Jimenez
106*ed775ee7SAntonio Huete Jimenez /* Rework the version string to get a nice indentation. */
107*ed775ee7SAntonio Huete Jimenez static void
cdp_print_version(netdissect_options * ndo,const u_char * cp,const u_int len)108*ed775ee7SAntonio Huete Jimenez cdp_print_version(netdissect_options *ndo,
109*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len)
110*ed775ee7SAntonio Huete Jimenez {
111*ed775ee7SAntonio Huete Jimenez unsigned i;
112*ed775ee7SAntonio Huete Jimenez
113*ed775ee7SAntonio Huete Jimenez ND_PRINT("\n\t ");
114*ed775ee7SAntonio Huete Jimenez for (i = 0; i < len; i++) {
115*ed775ee7SAntonio Huete Jimenez u_char c = GET_U_1(cp + i);
116*ed775ee7SAntonio Huete Jimenez
117*ed775ee7SAntonio Huete Jimenez if (c == '\n')
118*ed775ee7SAntonio Huete Jimenez ND_PRINT("\n\t ");
119*ed775ee7SAntonio Huete Jimenez else
120*ed775ee7SAntonio Huete Jimenez fn_print_char(ndo, c);
121*ed775ee7SAntonio Huete Jimenez }
122*ed775ee7SAntonio Huete Jimenez }
123*ed775ee7SAntonio Huete Jimenez
124*ed775ee7SAntonio Huete Jimenez static void
cdp_print_uint16(netdissect_options * ndo,const u_char * cp,const u_int len _U_)125*ed775ee7SAntonio Huete Jimenez cdp_print_uint16(netdissect_options *ndo,
126*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len _U_)
127*ed775ee7SAntonio Huete Jimenez {
128*ed775ee7SAntonio Huete Jimenez ND_PRINT("%u", GET_BE_U_2(cp));
129*ed775ee7SAntonio Huete Jimenez }
130*ed775ee7SAntonio Huete Jimenez
131*ed775ee7SAntonio Huete Jimenez static void
cdp_print_duplex(netdissect_options * ndo,const u_char * cp,const u_int len _U_)132*ed775ee7SAntonio Huete Jimenez cdp_print_duplex(netdissect_options *ndo,
133*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len _U_)
134*ed775ee7SAntonio Huete Jimenez {
135*ed775ee7SAntonio Huete Jimenez ND_PRINT("%s", GET_U_1(cp) ? "full": "half");
136*ed775ee7SAntonio Huete Jimenez }
137*ed775ee7SAntonio Huete Jimenez
138*ed775ee7SAntonio Huete Jimenez /* https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cata/186/2_12_m/english/release/notes/186rn21m.html
139*ed775ee7SAntonio Huete Jimenez * plus more details from other sources
140*ed775ee7SAntonio Huete Jimenez *
141*ed775ee7SAntonio Huete Jimenez * There are apparently versions of the request with both
142*ed775ee7SAntonio Huete Jimenez * 2 bytes and 3 bytes of value. The 3 bytes of value
143*ed775ee7SAntonio Huete Jimenez * appear to be a 1-byte application type followed by a
144*ed775ee7SAntonio Huete Jimenez * 2-byte VLAN ID; the 2 bytes of value are unknown
145*ed775ee7SAntonio Huete Jimenez * (they're 0x20 0x00 in some captures I've seen; that
146*ed775ee7SAntonio Huete Jimenez * is not a valid VLAN ID, as VLAN IDs are 12 bits).
147*ed775ee7SAntonio Huete Jimenez *
148*ed775ee7SAntonio Huete Jimenez * The replies all appear to be 3 bytes long.
149*ed775ee7SAntonio Huete Jimenez */
150*ed775ee7SAntonio Huete Jimenez static void
cdp_print_ata186(netdissect_options * ndo,const u_char * cp,const u_int len)151*ed775ee7SAntonio Huete Jimenez cdp_print_ata186(netdissect_options *ndo,
152*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len)
153*ed775ee7SAntonio Huete Jimenez {
154*ed775ee7SAntonio Huete Jimenez if (len == 2)
155*ed775ee7SAntonio Huete Jimenez ND_PRINT("unknown 0x%04x", GET_BE_U_2(cp));
156*ed775ee7SAntonio Huete Jimenez else
157*ed775ee7SAntonio Huete Jimenez ND_PRINT("app %u, vlan %u", GET_U_1(cp), GET_BE_U_2(cp + 1));
158*ed775ee7SAntonio Huete Jimenez }
159*ed775ee7SAntonio Huete Jimenez
160*ed775ee7SAntonio Huete Jimenez static void
cdp_print_mtu(netdissect_options * ndo,const u_char * cp,const u_int len _U_)161*ed775ee7SAntonio Huete Jimenez cdp_print_mtu(netdissect_options *ndo,
162*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len _U_)
163*ed775ee7SAntonio Huete Jimenez {
164*ed775ee7SAntonio Huete Jimenez ND_PRINT("%u bytes", GET_BE_U_4(cp));
165*ed775ee7SAntonio Huete Jimenez }
166*ed775ee7SAntonio Huete Jimenez
167*ed775ee7SAntonio Huete Jimenez static void
cdp_print_uint8x(netdissect_options * ndo,const u_char * cp,const u_int len _U_)168*ed775ee7SAntonio Huete Jimenez cdp_print_uint8x(netdissect_options *ndo,
169*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len _U_)
170*ed775ee7SAntonio Huete Jimenez {
171*ed775ee7SAntonio Huete Jimenez ND_PRINT("0x%02x", GET_U_1(cp));
172*ed775ee7SAntonio Huete Jimenez }
173*ed775ee7SAntonio Huete Jimenez
174*ed775ee7SAntonio Huete Jimenez static void
cdp_print_phys_loc(netdissect_options * ndo,const u_char * cp,const u_int len)175*ed775ee7SAntonio Huete Jimenez cdp_print_phys_loc(netdissect_options *ndo,
176*ed775ee7SAntonio Huete Jimenez const u_char *cp, const u_int len)
177*ed775ee7SAntonio Huete Jimenez {
178*ed775ee7SAntonio Huete Jimenez ND_PRINT("0x%02x", GET_U_1(cp));
179*ed775ee7SAntonio Huete Jimenez if (len > 1) {
180*ed775ee7SAntonio Huete Jimenez ND_PRINT("/");
181*ed775ee7SAntonio Huete Jimenez (void)nd_printn(ndo, cp + 1, len - 1, NULL);
182*ed775ee7SAntonio Huete Jimenez }
183*ed775ee7SAntonio Huete Jimenez }
184*ed775ee7SAntonio Huete Jimenez
185*ed775ee7SAntonio Huete Jimenez struct cdp_tlvinfo {
186*ed775ee7SAntonio Huete Jimenez const char *name;
187*ed775ee7SAntonio Huete Jimenez void (*printer)(netdissect_options *ndo, const u_char *, u_int);
188*ed775ee7SAntonio Huete Jimenez int min_len, max_len;
189*ed775ee7SAntonio Huete Jimenez };
190*ed775ee7SAntonio Huete Jimenez
191*ed775ee7SAntonio Huete Jimenez #define T_DEV_ID 0x01
192*ed775ee7SAntonio Huete Jimenez #define T_MAX 0x17
193*ed775ee7SAntonio Huete Jimenez static const struct cdp_tlvinfo cdptlvs[T_MAX + 1] = {
194*ed775ee7SAntonio Huete Jimenez /* 0x00 */
195*ed775ee7SAntonio Huete Jimenez [ T_DEV_ID ] = { "Device-ID", cdp_print_string, -1, -1 },
196*ed775ee7SAntonio Huete Jimenez [ 0x02 ] = { "Address", cdp_print_addr, -1, -1 },
197*ed775ee7SAntonio Huete Jimenez [ 0x03 ] = { "Port-ID", cdp_print_string, -1, -1 },
198*ed775ee7SAntonio Huete Jimenez [ 0x04 ] = { "Capability", cdp_print_capability, 4, 4 },
199*ed775ee7SAntonio Huete Jimenez [ 0x05 ] = { "Version String", cdp_print_version, -1, -1 },
200*ed775ee7SAntonio Huete Jimenez [ 0x06 ] = { "Platform", cdp_print_string, -1, -1 },
201*ed775ee7SAntonio Huete Jimenez [ 0x07 ] = { "Prefixes", cdp_print_prefixes, -1, -1 },
202*ed775ee7SAntonio Huete Jimenez /* not documented */
203*ed775ee7SAntonio Huete Jimenez [ 0x08 ] = { "Protocol-Hello option", NULL, -1, -1 },
204*ed775ee7SAntonio Huete Jimenez /* CDPv2 */
205*ed775ee7SAntonio Huete Jimenez [ 0x09 ] = { "VTP Management Domain", cdp_print_string, -1, -1 },
206*ed775ee7SAntonio Huete Jimenez /* CDPv2 */
207*ed775ee7SAntonio Huete Jimenez [ 0x0a ] = { "Native VLAN ID", cdp_print_uint16, 2, 2 },
208*ed775ee7SAntonio Huete Jimenez /* CDPv2 */
209*ed775ee7SAntonio Huete Jimenez [ 0x0b ] = { "Duplex", cdp_print_duplex, 1, 1 },
210*ed775ee7SAntonio Huete Jimenez /* 0x0c */
211*ed775ee7SAntonio Huete Jimenez /* 0x0d */
212*ed775ee7SAntonio Huete Jimenez /* incomplete doc. */
213*ed775ee7SAntonio Huete Jimenez [ 0x0e ] = { "ATA-186 VoIP VLAN assignment", cdp_print_ata186, 3, 3 },
214*ed775ee7SAntonio Huete Jimenez /* incomplete doc. */
215*ed775ee7SAntonio Huete Jimenez [ 0x0f ] = { "ATA-186 VoIP VLAN request", cdp_print_ata186, 2, 3 },
216*ed775ee7SAntonio Huete Jimenez /* not documented */
217*ed775ee7SAntonio Huete Jimenez [ 0x10 ] = { "power consumption", cdp_print_power, 1, 3 },
218*ed775ee7SAntonio Huete Jimenez /* not documented */
219*ed775ee7SAntonio Huete Jimenez [ 0x11 ] = { "MTU", cdp_print_mtu, 4, 4 },
220*ed775ee7SAntonio Huete Jimenez /* not documented */
221*ed775ee7SAntonio Huete Jimenez [ 0x12 ] = { "AVVID trust bitmap", cdp_print_uint8x, 1, 1 },
222*ed775ee7SAntonio Huete Jimenez /* not documented */
223*ed775ee7SAntonio Huete Jimenez [ 0x13 ] = { "AVVID untrusted ports CoS", cdp_print_uint8x, 1, 1 },
224*ed775ee7SAntonio Huete Jimenez /* not documented */
225*ed775ee7SAntonio Huete Jimenez [ 0x14 ] = { "System Name", cdp_print_string, -1, -1 },
226*ed775ee7SAntonio Huete Jimenez /* not documented */
227*ed775ee7SAntonio Huete Jimenez [ 0x15 ] = { "System Object ID (not decoded)", NULL, -1, -1 },
228*ed775ee7SAntonio Huete Jimenez [ 0x16 ] = { "Management Addresses", cdp_print_addr, 4, -1 },
229*ed775ee7SAntonio Huete Jimenez /* not documented */
230*ed775ee7SAntonio Huete Jimenez [ 0x17 ] = { "Physical Location", cdp_print_phys_loc, 1, -1 },
231*ed775ee7SAntonio Huete Jimenez };
23241c99275SPeter Avalos
23341c99275SPeter Avalos void
cdp_print(netdissect_options * ndo,const u_char * tptr,u_int length)234411677aeSAaron LI cdp_print(netdissect_options *ndo,
235*ed775ee7SAntonio Huete Jimenez const u_char *tptr, u_int length)
23641c99275SPeter Avalos {
237*ed775ee7SAntonio Huete Jimenez u_int orig_length = length;
238*ed775ee7SAntonio Huete Jimenez uint16_t checksum;
23941c99275SPeter Avalos
240*ed775ee7SAntonio Huete Jimenez ndo->ndo_protocol = "cdp";
241*ed775ee7SAntonio Huete Jimenez
242*ed775ee7SAntonio Huete Jimenez if (length < CDP_HEADER_LEN) {
243*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (packet length %u < %u)", length, CDP_HEADER_LEN);
244*ed775ee7SAntonio Huete Jimenez goto invalid;
24541c99275SPeter Avalos }
246*ed775ee7SAntonio Huete Jimenez ND_PRINT("CDPv%u, ttl: %us",
247*ed775ee7SAntonio Huete Jimenez GET_U_1(tptr + CDP_HEADER_VERSION_OFFSET),
248*ed775ee7SAntonio Huete Jimenez GET_U_1(tptr + CDP_HEADER_TTL_OFFSET));
249*ed775ee7SAntonio Huete Jimenez checksum = GET_BE_U_2(tptr + CDP_HEADER_CHECKSUM_OFFSET);
250411677aeSAaron LI if (ndo->ndo_vflag)
251*ed775ee7SAntonio Huete Jimenez ND_PRINT(", checksum: 0x%04x (unverified), length %u",
252*ed775ee7SAntonio Huete Jimenez checksum, orig_length);
25341c99275SPeter Avalos tptr += CDP_HEADER_LEN;
254*ed775ee7SAntonio Huete Jimenez length -= CDP_HEADER_LEN;
25541c99275SPeter Avalos
256*ed775ee7SAntonio Huete Jimenez while (length) {
257*ed775ee7SAntonio Huete Jimenez u_int type, len;
258*ed775ee7SAntonio Huete Jimenez const struct cdp_tlvinfo *info;
259*ed775ee7SAntonio Huete Jimenez const char *name;
260*ed775ee7SAntonio Huete Jimenez u_char covered = 0;
261*ed775ee7SAntonio Huete Jimenez
262*ed775ee7SAntonio Huete Jimenez if (length < CDP_TLV_HEADER_LEN) {
263*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (remaining packet length %u < %u)",
264*ed775ee7SAntonio Huete Jimenez length, CDP_TLV_HEADER_LEN);
265*ed775ee7SAntonio Huete Jimenez goto invalid;
266*ed775ee7SAntonio Huete Jimenez }
267*ed775ee7SAntonio Huete Jimenez type = GET_BE_U_2(tptr + CDP_TLV_TYPE_OFFSET);
268*ed775ee7SAntonio Huete Jimenez len = GET_BE_U_2(tptr + CDP_TLV_LEN_OFFSET); /* object length includes the 4 bytes header length */
269*ed775ee7SAntonio Huete Jimenez info = type <= T_MAX ? &cdptlvs[type] : NULL;
270*ed775ee7SAntonio Huete Jimenez name = (info && info->name) ? info->name : "unknown field type";
271411677aeSAaron LI if (len < CDP_TLV_HEADER_LEN) {
272411677aeSAaron LI if (ndo->ndo_vflag)
273*ed775ee7SAntonio Huete Jimenez ND_PRINT("\n\t%s (0x%02x), TLV length: %u byte%s (too short)",
274*ed775ee7SAntonio Huete Jimenez name, type, len, PLURAL_SUFFIX(len));
275411677aeSAaron LI else
276*ed775ee7SAntonio Huete Jimenez ND_PRINT(", %s TLV length %u too short",
277*ed775ee7SAntonio Huete Jimenez name, len);
278*ed775ee7SAntonio Huete Jimenez goto invalid;
279*ed775ee7SAntonio Huete Jimenez }
280*ed775ee7SAntonio Huete Jimenez if (len > length) {
281*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (TLV length %u > %u)", len, length);
282*ed775ee7SAntonio Huete Jimenez goto invalid;
283411677aeSAaron LI }
284411677aeSAaron LI tptr += CDP_TLV_HEADER_LEN;
285*ed775ee7SAntonio Huete Jimenez length -= CDP_TLV_HEADER_LEN;
286411677aeSAaron LI len -= CDP_TLV_HEADER_LEN;
287411677aeSAaron LI
288*ed775ee7SAntonio Huete Jimenez /* In non-verbose mode just print Device-ID. */
289*ed775ee7SAntonio Huete Jimenez if (!ndo->ndo_vflag && type == T_DEV_ID)
290*ed775ee7SAntonio Huete Jimenez ND_PRINT(", Device-ID ");
291*ed775ee7SAntonio Huete Jimenez else if (ndo->ndo_vflag)
292*ed775ee7SAntonio Huete Jimenez ND_PRINT("\n\t%s (0x%02x), value length: %u byte%s: ",
293*ed775ee7SAntonio Huete Jimenez name, type, len, PLURAL_SUFFIX(len));
294411677aeSAaron LI
295*ed775ee7SAntonio Huete Jimenez if (info) {
296*ed775ee7SAntonio Huete Jimenez if ((info->min_len > 0 && len < (unsigned)info->min_len) ||
297*ed775ee7SAntonio Huete Jimenez (info->max_len > 0 && len > (unsigned)info->max_len))
298*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (malformed TLV)");
299*ed775ee7SAntonio Huete Jimenez else if (ndo->ndo_vflag || type == T_DEV_ID) {
300*ed775ee7SAntonio Huete Jimenez if (info->printer)
301*ed775ee7SAntonio Huete Jimenez info->printer(ndo, tptr, len);
302411677aeSAaron LI else
303*ed775ee7SAntonio Huete Jimenez ND_TCHECK_LEN(tptr, len);
304*ed775ee7SAntonio Huete Jimenez /*
305*ed775ee7SAntonio Huete Jimenez * When the type is defined without a printer,
306*ed775ee7SAntonio Huete Jimenez * do not print the hex dump.
30741c99275SPeter Avalos */
308*ed775ee7SAntonio Huete Jimenez covered = 1;
30927bfbee1SPeter Avalos }
310*ed775ee7SAntonio Huete Jimenez }
311*ed775ee7SAntonio Huete Jimenez
312*ed775ee7SAntonio Huete Jimenez if (!covered) {
313*ed775ee7SAntonio Huete Jimenez ND_TCHECK_LEN(tptr, len);
314411677aeSAaron LI print_unknown_data(ndo, tptr, "\n\t ", len);
31541c99275SPeter Avalos }
316*ed775ee7SAntonio Huete Jimenez tptr += len;
317*ed775ee7SAntonio Huete Jimenez length -= len;
31841c99275SPeter Avalos }
319411677aeSAaron LI if (ndo->ndo_vflag < 1)
320*ed775ee7SAntonio Huete Jimenez ND_PRINT(", length %u", orig_length);
32141c99275SPeter Avalos
32241c99275SPeter Avalos return;
323*ed775ee7SAntonio Huete Jimenez invalid:
324*ed775ee7SAntonio Huete Jimenez nd_print_invalid(ndo);
325*ed775ee7SAntonio Huete Jimenez ND_TCHECK_LEN(tptr, length);
32641c99275SPeter Avalos }
32741c99275SPeter Avalos
32841c99275SPeter Avalos /*
32941c99275SPeter Avalos * Protocol type values.
33041c99275SPeter Avalos *
33141c99275SPeter Avalos * PT_NLPID means that the protocol type field contains an OSI NLPID.
33241c99275SPeter Avalos *
33341c99275SPeter Avalos * PT_IEEE_802_2 means that the protocol type field contains an IEEE 802.2
33441c99275SPeter Avalos * LLC header that specifies that the payload is for that protocol.
33541c99275SPeter Avalos */
33641c99275SPeter Avalos #define PT_NLPID 1 /* OSI NLPID */
33741c99275SPeter Avalos #define PT_IEEE_802_2 2 /* IEEE 802.2 LLC header */
33841c99275SPeter Avalos
339*ed775ee7SAntonio Huete Jimenez static void
cdp_print_addr(netdissect_options * ndo,const u_char * p,u_int l)340411677aeSAaron LI cdp_print_addr(netdissect_options *ndo,
341*ed775ee7SAntonio Huete Jimenez const u_char * p, u_int l)
34241c99275SPeter Avalos {
343*ed775ee7SAntonio Huete Jimenez u_int num;
344411677aeSAaron LI static const u_char prot_ipv6[] = {
34541c99275SPeter Avalos 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd
34641c99275SPeter Avalos };
34741c99275SPeter Avalos
348*ed775ee7SAntonio Huete Jimenez if (l < 4) {
349*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (not enough space for num)");
350*ed775ee7SAntonio Huete Jimenez goto invalid;
351*ed775ee7SAntonio Huete Jimenez }
352*ed775ee7SAntonio Huete Jimenez num = GET_BE_U_4(p);
35341c99275SPeter Avalos p += 4;
354*ed775ee7SAntonio Huete Jimenez l -= 4;
35541c99275SPeter Avalos
356*ed775ee7SAntonio Huete Jimenez while (num) {
357*ed775ee7SAntonio Huete Jimenez u_int pt, pl, al;
358*ed775ee7SAntonio Huete Jimenez
359*ed775ee7SAntonio Huete Jimenez if (l < 2) {
360*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (not enough space for PT+PL)");
361*ed775ee7SAntonio Huete Jimenez goto invalid;
362*ed775ee7SAntonio Huete Jimenez }
363*ed775ee7SAntonio Huete Jimenez pt = GET_U_1(p); /* type of "protocol" field */
364*ed775ee7SAntonio Huete Jimenez pl = GET_U_1(p + 1); /* length of "protocol" field */
36541c99275SPeter Avalos p += 2;
366*ed775ee7SAntonio Huete Jimenez l -= 2;
36741c99275SPeter Avalos
368*ed775ee7SAntonio Huete Jimenez if (l < pl + 2) {
369*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (not enough space for P+AL)");
370*ed775ee7SAntonio Huete Jimenez goto invalid;
371*ed775ee7SAntonio Huete Jimenez }
372*ed775ee7SAntonio Huete Jimenez /* Skip the protocol for now. */
373*ed775ee7SAntonio Huete Jimenez al = GET_BE_U_2(p + pl); /* address length */
37441c99275SPeter Avalos
375*ed775ee7SAntonio Huete Jimenez if (pt == PT_NLPID && pl == 1 && GET_U_1(p) == NLPID_IP &&
376*ed775ee7SAntonio Huete Jimenez al == 4) {
37741c99275SPeter Avalos /*
37841c99275SPeter Avalos * IPv4: protocol type = NLPID, protocol length = 1
37941c99275SPeter Avalos * (1-byte NLPID), protocol = 0xcc (NLPID for IPv4),
38041c99275SPeter Avalos * address length = 4
38141c99275SPeter Avalos */
382*ed775ee7SAntonio Huete Jimenez p += pl + 2;
383*ed775ee7SAntonio Huete Jimenez l -= pl + 2;
384*ed775ee7SAntonio Huete Jimenez /* p is just beyond al now. */
385*ed775ee7SAntonio Huete Jimenez if (l < al) {
386*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (not enough space for A)");
387*ed775ee7SAntonio Huete Jimenez goto invalid;
388*ed775ee7SAntonio Huete Jimenez }
389*ed775ee7SAntonio Huete Jimenez ND_PRINT("IPv4 (%u) %s", num, GET_IPADDR_STRING(p));
390*ed775ee7SAntonio Huete Jimenez p += al;
391*ed775ee7SAntonio Huete Jimenez l -= al;
39241c99275SPeter Avalos }
39341c99275SPeter Avalos else if (pt == PT_IEEE_802_2 && pl == 8 &&
39441c99275SPeter Avalos memcmp(p, prot_ipv6, 8) == 0 && al == 16) {
39541c99275SPeter Avalos /*
39641c99275SPeter Avalos * IPv6: protocol type = IEEE 802.2 header,
39741c99275SPeter Avalos * protocol length = 8 (size of LLC+SNAP header),
39841c99275SPeter Avalos * protocol = LLC+SNAP header with the IPv6
39941c99275SPeter Avalos * Ethertype, address length = 16
40041c99275SPeter Avalos */
401*ed775ee7SAntonio Huete Jimenez p += pl + 2;
402*ed775ee7SAntonio Huete Jimenez l -= pl + 2;
403*ed775ee7SAntonio Huete Jimenez /* p is just beyond al now. */
404*ed775ee7SAntonio Huete Jimenez if (l < al) {
405*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (not enough space for A)");
406*ed775ee7SAntonio Huete Jimenez goto invalid;
407*ed775ee7SAntonio Huete Jimenez }
408*ed775ee7SAntonio Huete Jimenez ND_PRINT("IPv6 (%u) %s", num, GET_IP6ADDR_STRING(p));
40941c99275SPeter Avalos p += al;
410*ed775ee7SAntonio Huete Jimenez l -= al;
41141c99275SPeter Avalos }
41241c99275SPeter Avalos else {
41341c99275SPeter Avalos /*
41441c99275SPeter Avalos * Generic case: just print raw data
41541c99275SPeter Avalos */
416*ed775ee7SAntonio Huete Jimenez ND_PRINT("pt=0x%02x, pl=%u, pb=", pt, pl);
417*ed775ee7SAntonio Huete Jimenez while (pl != 0) {
418*ed775ee7SAntonio Huete Jimenez ND_PRINT(" %02x", GET_U_1(p));
419*ed775ee7SAntonio Huete Jimenez p++;
420*ed775ee7SAntonio Huete Jimenez l--;
421*ed775ee7SAntonio Huete Jimenez pl--;
422*ed775ee7SAntonio Huete Jimenez }
423*ed775ee7SAntonio Huete Jimenez ND_PRINT(", al=%u, a=", al);
42441c99275SPeter Avalos p += 2;
425*ed775ee7SAntonio Huete Jimenez l -= 2;
426*ed775ee7SAntonio Huete Jimenez /* p is just beyond al now. */
427*ed775ee7SAntonio Huete Jimenez if (l < al) {
428*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (not enough space for A)");
429*ed775ee7SAntonio Huete Jimenez goto invalid;
430*ed775ee7SAntonio Huete Jimenez }
431*ed775ee7SAntonio Huete Jimenez while (al != 0) {
432*ed775ee7SAntonio Huete Jimenez ND_PRINT(" %02x", GET_U_1(p));
433*ed775ee7SAntonio Huete Jimenez p++;
434*ed775ee7SAntonio Huete Jimenez l--;
435*ed775ee7SAntonio Huete Jimenez al--;
436*ed775ee7SAntonio Huete Jimenez }
43741c99275SPeter Avalos }
43841c99275SPeter Avalos num--;
43941c99275SPeter Avalos if (num)
440*ed775ee7SAntonio Huete Jimenez ND_PRINT(" ");
441*ed775ee7SAntonio Huete Jimenez }
442*ed775ee7SAntonio Huete Jimenez if (l)
443*ed775ee7SAntonio Huete Jimenez ND_PRINT(" (%u bytes of stray data)", l);
444*ed775ee7SAntonio Huete Jimenez return;
445*ed775ee7SAntonio Huete Jimenez
446*ed775ee7SAntonio Huete Jimenez invalid:
447*ed775ee7SAntonio Huete Jimenez ND_TCHECK_LEN(p, l);
44841c99275SPeter Avalos }
44941c99275SPeter Avalos
450*ed775ee7SAntonio Huete Jimenez static void
cdp_print_prefixes(netdissect_options * ndo,const u_char * p,u_int l)451411677aeSAaron LI cdp_print_prefixes(netdissect_options *ndo,
452*ed775ee7SAntonio Huete Jimenez const u_char * p, u_int l)
45341c99275SPeter Avalos {
454*ed775ee7SAntonio Huete Jimenez if (l % 5) {
455*ed775ee7SAntonio Huete Jimenez ND_PRINT(" [length %u is not a multiple of 5]", l);
456*ed775ee7SAntonio Huete Jimenez goto invalid;
457*ed775ee7SAntonio Huete Jimenez }
45841c99275SPeter Avalos
459*ed775ee7SAntonio Huete Jimenez ND_PRINT(" IPv4 Prefixes (%u):", l / 5);
46041c99275SPeter Avalos
46141c99275SPeter Avalos while (l > 0) {
462*ed775ee7SAntonio Huete Jimenez ND_PRINT(" %u.%u.%u.%u/%u",
463*ed775ee7SAntonio Huete Jimenez GET_U_1(p), GET_U_1(p + 1), GET_U_1(p + 2),
464*ed775ee7SAntonio Huete Jimenez GET_U_1(p + 3), GET_U_1(p + 4));
46541c99275SPeter Avalos l -= 5;
46641c99275SPeter Avalos p += 5;
46741c99275SPeter Avalos }
468*ed775ee7SAntonio Huete Jimenez return;
46941c99275SPeter Avalos
470*ed775ee7SAntonio Huete Jimenez invalid:
471*ed775ee7SAntonio Huete Jimenez ND_TCHECK_LEN(p, l);
47241c99275SPeter Avalos }
473