2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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)
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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
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.
23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.28.2.3 2004/03/24 00:46:03 guy Exp $ (LBL)";
31 #include <tcpdump-stdinc.h>
36 #include "interface.h"
37 #include "addrtoname.h"
38 #include "ethertype.h"
43 static void chdlc_slarp_print(const u_char *, u_int);
45 /* Standard CHDLC printer */
47 chdlc_if_print(const struct pcap_pkthdr *h, register const u_char *p)
49 register u_int length = h->len;
50 register u_int caplen = h->caplen;
54 if (caplen < CHDLC_HDRLEN) {
59 proto = EXTRACT_16BITS(&p[2]);
69 printf("0x%02x ", p[0]);
72 printf("%d %04x: ", length, proto);
75 length -= CHDLC_HDRLEN;
76 ip = (const struct ip *)(p + CHDLC_HDRLEN);
79 ip_print((const u_char *)ip, length);
83 ip6_print((const u_char *)ip, length);
86 case CHDLC_TYPE_SLARP:
87 chdlc_slarp_print((const u_char *)ip, length);
91 chdlc_cdp_print((const u_char *)ip, length);
95 case ETHERTYPE_MPLS_MULTI:
96 mpls_print((const u_char *)(ip), length);
99 /* is the fudge byte set ? lets verify by spotting ISO headers */
100 if (*(p+CHDLC_HDRLEN+1) == 0x81 ||
101 *(p+CHDLC_HDRLEN+1) == 0x82 ||
102 *(p+CHDLC_HDRLEN+1) == 0x83)
103 isoclns_print(p+CHDLC_HDRLEN+1, length-1, length-1);
105 isoclns_print(p+CHDLC_HDRLEN, length, length);
108 printf("unknown CHDLC protocol (0x%04x)", proto);
112 return (CHDLC_HDRLEN);
117 #define SLARP_REQUEST 0
118 #define SLARP_REPLY 1
119 #define SLARP_KEEPALIVE 2
139 chdlc_slarp_print(const u_char *cp, u_int length)
141 const struct cisco_slarp *slarp;
143 if (length < SLARP_LEN)
146 slarp = (const struct cisco_slarp *)cp;
148 printf("SLARP (length: %u), ",length);
149 switch (EXTRACT_32BITS(&slarp->code)) {
152 /* ok we do not know it - but lets at least dump it */
153 print_unknown_data(cp+4,"\n\t",length-4);
156 printf("reply %s/%s",
157 ipaddr_string(&slarp->un.addr.addr),
158 ipaddr_string(&slarp->un.addr.mask));
160 case SLARP_KEEPALIVE:
161 printf("keepalive: mineseen=0x%08x, yourseen=0x%08x",
162 EXTRACT_32BITS(&slarp->un.keep.myseq),
163 EXTRACT_32BITS(&slarp->un.keep.yourseq));
164 printf(", reliability=0x%04x, t1=%d.%d",
165 EXTRACT_16BITS(&slarp->un.keep.rel),
166 EXTRACT_16BITS(&slarp->un.keep.t1),
167 EXTRACT_16BITS(&slarp->un.keep.t2));
170 printf("0x%02x unknown", EXTRACT_32BITS(&slarp->code));
172 print_unknown_data(cp+4,"\n\t",length-4);
176 if (SLARP_LEN < length && vflag)
177 printf(", (trailing junk: %d bytes)", length - SLARP_LEN);
179 print_unknown_data(cp+4,"\n\t",length-4);