370 lines
11 KiB
C
370 lines
11 KiB
C
/*
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* Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Code by Gert Doering, SpaceNet GmbH, gert@space.net
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*
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* Reference documentation:
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* http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#include "nlpid.h"
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static const char tstr[] = "[|cdp]";
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#define CDP_HEADER_LEN 4
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static const struct tok cdp_tlv_values[] = {
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{ 0x01, "Device-ID"},
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{ 0x02, "Address"},
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{ 0x03, "Port-ID"},
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{ 0x04, "Capability"},
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{ 0x05, "Version String"},
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{ 0x06, "Platform"},
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{ 0x07, "Prefixes"},
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{ 0x08, "Protocol-Hello option"},
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{ 0x09, "VTP Management Domain"},
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{ 0x0a, "Native VLAN ID"},
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{ 0x0b, "Duplex"},
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{ 0x0e, "ATA-186 VoIP VLAN request"},
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{ 0x0f, "ATA-186 VoIP VLAN assignment"},
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{ 0x10, "power consumption"},
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{ 0x11, "MTU"},
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{ 0x12, "AVVID trust bitmap"},
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{ 0x13, "AVVID untrusted ports CoS"},
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{ 0x14, "System Name"},
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{ 0x15, "System Object ID (not decoded)"},
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{ 0x16, "Management Addresses"},
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{ 0x17, "Physical Location"},
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{ 0, NULL}
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};
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static const struct tok cdp_capability_values[] = {
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{ 0x01, "Router" },
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{ 0x02, "Transparent Bridge" },
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{ 0x04, "Source Route Bridge" },
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{ 0x08, "L2 Switch" },
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{ 0x10, "L3 capable" },
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{ 0x20, "IGMP snooping" },
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{ 0x40, "L1 capable" },
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{ 0, NULL }
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};
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static int cdp_print_addr(netdissect_options *, const u_char *, int);
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static int cdp_print_prefixes(netdissect_options *, const u_char *, int);
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static unsigned long cdp_get_number(const u_char *, int);
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void
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cdp_print(netdissect_options *ndo,
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const u_char *pptr, u_int length, u_int caplen)
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{
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int type, len, i, j;
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const u_char *tptr;
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if (caplen < CDP_HEADER_LEN) {
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ND_PRINT((ndo, "%s", tstr));
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return;
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}
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tptr = pptr; /* temporary pointer */
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ND_TCHECK2(*tptr, CDP_HEADER_LEN);
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ND_PRINT((ndo, "CDPv%u, ttl: %us", *tptr, *(tptr + 1)));
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if (ndo->ndo_vflag)
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ND_PRINT((ndo, ", checksum: %u (unverified), length %u", EXTRACT_16BITS(tptr), length));
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tptr += CDP_HEADER_LEN;
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while (tptr < (pptr+length)) {
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ND_TCHECK2(*tptr, 4); /* read out Type and Length */
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type = EXTRACT_16BITS(tptr);
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len = EXTRACT_16BITS(tptr+2); /* object length includes the 4 bytes header length */
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tptr += 4;
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len -= 4;
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ND_TCHECK2(*tptr, len);
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if (ndo->ndo_vflag || type == 1) { /* in non-verbose mode just print Device-ID */
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if (ndo->ndo_vflag)
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ND_PRINT((ndo, "\n\t%s (0x%02x), length: %u byte%s: ",
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tok2str(cdp_tlv_values,"unknown field type", type),
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type,
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len,
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PLURAL_SUFFIX(len))); /* plural */
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switch (type) {
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case 0x01: /* Device-ID */
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if (!ndo->ndo_vflag)
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ND_PRINT((ndo, ", Device-ID "));
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ND_PRINT((ndo, "'"));
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fn_printn(ndo, tptr, len, NULL);
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ND_PRINT((ndo, "'"));
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break;
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case 0x02: /* Address */
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if (cdp_print_addr(ndo, tptr, len) < 0)
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goto trunc;
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break;
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case 0x03: /* Port-ID */
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ND_PRINT((ndo, "'"));
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fn_printn(ndo, tptr, len, NULL);
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ND_PRINT((ndo, "'"));
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break;
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case 0x04: /* Capabilities */
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ND_PRINT((ndo, "(0x%08x): %s",
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EXTRACT_32BITS(tptr),
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bittok2str(cdp_capability_values, "none", EXTRACT_32BITS(tptr))));
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break;
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case 0x05: /* Version */
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ND_PRINT((ndo, "\n\t "));
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for (i=0;i<len;i++) {
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j = *(tptr+i);
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ND_PRINT((ndo, "%c", j));
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if (j == 0x0a) /* lets rework the version string to get a nice identation */
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ND_PRINT((ndo, "\t "));
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}
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break;
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case 0x06: /* Platform */
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ND_PRINT((ndo, "'"));
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fn_printn(ndo, tptr, len, NULL);
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ND_PRINT((ndo, "'"));
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break;
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case 0x07: /* Prefixes */
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if (cdp_print_prefixes(ndo, tptr, len) < 0)
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goto trunc;
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break;
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case 0x08: /* Protocol Hello Option - not documented */
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break;
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case 0x09: /* VTP Mgmt Domain - not documented */
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ND_PRINT((ndo, "'"));
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fn_printn(ndo, tptr, len, NULL);
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ND_PRINT((ndo, "'"));
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break;
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case 0x0a: /* Native VLAN ID - not documented */
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ND_PRINT((ndo, "%d", EXTRACT_16BITS(tptr)));
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break;
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case 0x0b: /* Duplex - not documented */
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ND_PRINT((ndo, "%s", *(tptr) ? "full": "half"));
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break;
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/* http://www.cisco.com/univercd/cc/td/doc/product/voice/ata/atarn/186rn21m.htm
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* plus more details from other sources
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*/
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case 0x0e: /* ATA-186 VoIP VLAN request - incomplete doc. */
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ND_PRINT((ndo, "app %d, vlan %d", *(tptr), EXTRACT_16BITS(tptr + 1)));
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break;
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case 0x10: /* ATA-186 VoIP VLAN assignment - incomplete doc. */
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ND_PRINT((ndo, "%1.2fW", cdp_get_number(tptr, len) / 1000.0));
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break;
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case 0x11: /* MTU - not documented */
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ND_PRINT((ndo, "%u bytes", EXTRACT_32BITS(tptr)));
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break;
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case 0x12: /* AVVID trust bitmap - not documented */
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ND_PRINT((ndo, "0x%02x", *(tptr)));
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break;
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case 0x13: /* AVVID untrusted port CoS - not documented */
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ND_PRINT((ndo, "0x%02x", *(tptr)));
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break;
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case 0x14: /* System Name - not documented */
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ND_PRINT((ndo, "'"));
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fn_printn(ndo, tptr, len, NULL);
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ND_PRINT((ndo, "'"));
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break;
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case 0x16: /* System Object ID - not documented */
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if (cdp_print_addr(ndo, tptr, len) < 0)
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goto trunc;
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break;
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case 0x17: /* Physical Location - not documented */
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ND_PRINT((ndo, "0x%02x", *(tptr)));
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if (len > 1) {
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ND_PRINT((ndo, "/"));
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fn_printn(ndo, tptr + 1, len - 1, NULL);
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}
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break;
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default:
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print_unknown_data(ndo, tptr, "\n\t ", len);
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break;
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}
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}
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/* avoid infinite loop */
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if (len == 0)
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break;
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tptr = tptr+len;
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}
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if (ndo->ndo_vflag < 1)
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ND_PRINT((ndo, ", length %u", caplen));
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return;
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trunc:
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ND_PRINT((ndo, "%s", tstr));
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}
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/*
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* Protocol type values.
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*
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* PT_NLPID means that the protocol type field contains an OSI NLPID.
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*
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* PT_IEEE_802_2 means that the protocol type field contains an IEEE 802.2
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* LLC header that specifies that the payload is for that protocol.
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*/
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#define PT_NLPID 1 /* OSI NLPID */
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#define PT_IEEE_802_2 2 /* IEEE 802.2 LLC header */
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static int
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cdp_print_addr(netdissect_options *ndo,
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const u_char * p, int l)
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{
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int pt, pl, al, num;
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const u_char *endp = p + l;
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#ifdef INET6
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static const u_char prot_ipv6[] = {
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0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00, 0x86, 0xdd
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};
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#endif
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ND_TCHECK2(*p, 2);
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num = EXTRACT_32BITS(p);
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p += 4;
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while (p < endp && num >= 0) {
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ND_TCHECK2(*p, 2);
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if (p + 2 > endp)
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goto trunc;
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pt = p[0]; /* type of "protocol" field */
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pl = p[1]; /* length of "protocol" field */
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p += 2;
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ND_TCHECK2(p[pl], 2);
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if (p + pl + 2 > endp)
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goto trunc;
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al = EXTRACT_16BITS(&p[pl]); /* address length */
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if (pt == PT_NLPID && pl == 1 && *p == NLPID_IP && al == 4) {
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/*
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* IPv4: protocol type = NLPID, protocol length = 1
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* (1-byte NLPID), protocol = 0xcc (NLPID for IPv4),
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* address length = 4
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*/
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p += 3;
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ND_TCHECK2(*p, 4);
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if (p + 4 > endp)
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goto trunc;
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ND_PRINT((ndo, "IPv4 (%u) %s", num, ipaddr_string(ndo, p)));
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p += 4;
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}
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#ifdef INET6
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else if (pt == PT_IEEE_802_2 && pl == 8 &&
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memcmp(p, prot_ipv6, 8) == 0 && al == 16) {
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/*
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* IPv6: protocol type = IEEE 802.2 header,
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* protocol length = 8 (size of LLC+SNAP header),
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* protocol = LLC+SNAP header with the IPv6
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* Ethertype, address length = 16
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*/
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p += 10;
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ND_TCHECK2(*p, al);
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if (p + al > endp)
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goto trunc;
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ND_PRINT((ndo, "IPv6 (%u) %s", num, ip6addr_string(ndo, p)));
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p += al;
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}
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#endif
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else {
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/*
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* Generic case: just print raw data
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*/
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ND_TCHECK2(*p, pl);
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if (p + pl > endp)
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goto trunc;
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ND_PRINT((ndo, "pt=0x%02x, pl=%d, pb=", *(p - 2), pl));
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while (pl-- > 0)
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ND_PRINT((ndo, " %02x", *p++));
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ND_TCHECK2(*p, 2);
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if (p + 2 > endp)
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goto trunc;
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al = (*p << 8) + *(p + 1);
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ND_PRINT((ndo, ", al=%d, a=", al));
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p += 2;
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ND_TCHECK2(*p, al);
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if (p + al > endp)
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goto trunc;
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while (al-- > 0)
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ND_PRINT((ndo, " %02x", *p++));
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}
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num--;
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if (num)
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ND_PRINT((ndo, " "));
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}
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return 0;
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trunc:
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return -1;
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}
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static int
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cdp_print_prefixes(netdissect_options *ndo,
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const u_char * p, int l)
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{
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if (l % 5)
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goto trunc;
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ND_PRINT((ndo, " IPv4 Prefixes (%d):", l / 5));
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while (l > 0) {
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ND_PRINT((ndo, " %u.%u.%u.%u/%u", p[0], p[1], p[2], p[3], p[4]));
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l -= 5;
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p += 5;
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}
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return 0;
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trunc:
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return -1;
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}
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/* read in a <n>-byte number, MSB first
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* (of course this can handle max sizeof(long))
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*/
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static unsigned long cdp_get_number(const u_char * p, int l)
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{
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unsigned long res=0;
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while( l>0 )
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{
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res = (res<<8) + *p;
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p++; l--;
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}
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return res;
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}
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