2 * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
3 * The Regents of the University of California. All rights reserved.
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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.
22 /* \summary: Cisco HDLC printer */
28 #include <netdissect-stdinc.h>
30 #include "netdissect.h"
31 #include "addrtoname.h"
32 #include "ethertype.h"
36 static void chdlc_slarp_print(netdissect_options *, const u_char *, u_int);
38 static const struct tok chdlc_cast_values[] = {
39 { CHDLC_UNICAST, "unicast" },
40 { CHDLC_BCAST, "bcast" },
45 /* Standard CHDLC printer */
47 chdlc_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, register const u_char *p)
49 return chdlc_print(ndo, p, h->len);
53 chdlc_print(netdissect_options *ndo, register const u_char *p, u_int length)
58 if (length < CHDLC_HDRLEN)
60 ND_TCHECK2(*p, CHDLC_HDRLEN);
61 proto = EXTRACT_16BITS(&p[2]);
63 ND_PRINT((ndo, "%s, ethertype %s (0x%04x), length %u: ",
64 tok2str(chdlc_cast_values, "0x%02x", p[0]),
65 tok2str(ethertype_values, "Unknown", proto),
70 length -= CHDLC_HDRLEN;
75 ip_print(ndo, p, length);
78 ip6_print(ndo, p, length);
80 case CHDLC_TYPE_SLARP:
81 chdlc_slarp_print(ndo, p, length);
85 chdlc_cdp_print(p, length);
89 case ETHERTYPE_MPLS_MULTI:
90 mpls_print(ndo, p, length);
93 /* is the fudge byte set ? lets verify by spotting ISO headers */
100 isoclns_print(ndo, p + 1, length - 1);
102 isoclns_print(ndo, p, length);
106 ND_PRINT((ndo, "unknown CHDLC protocol (0x%04x)", proto));
110 return (CHDLC_HDRLEN);
113 ND_PRINT((ndo, "[|chdlc]"));
114 return ndo->ndo_snapend - bp;
118 * The fixed-length portion of a SLARP packet.
122 #define SLARP_REQUEST 0
123 #define SLARP_REPLY 1
124 #define SLARP_KEEPALIVE 2
138 #define SLARP_MIN_LEN 14
139 #define SLARP_MAX_LEN 18
142 chdlc_slarp_print(netdissect_options *ndo, const u_char *cp, u_int length)
144 const struct cisco_slarp *slarp;
145 u_int sec,min,hrs,days;
147 ND_PRINT((ndo, "SLARP (length: %u), ",length));
148 if (length < SLARP_MIN_LEN)
151 slarp = (const struct cisco_slarp *)cp;
152 ND_TCHECK2(*slarp, SLARP_MIN_LEN);
153 switch (EXTRACT_32BITS(&slarp->code)) {
155 ND_PRINT((ndo, "request"));
157 * At least according to William "Chops" Westfield's
160 * http://www.nethelp.no/net/cisco-hdlc.txt
162 * the address and mask aren't used in requests -
167 ND_PRINT((ndo, "reply %s/%s",
168 ipaddr_string(ndo, &slarp->un.addr.addr),
169 ipaddr_string(ndo, &slarp->un.addr.mask)));
171 case SLARP_KEEPALIVE:
172 ND_PRINT((ndo, "keepalive: mineseen=0x%08x, yourseen=0x%08x, reliability=0x%04x",
173 EXTRACT_32BITS(&slarp->un.keep.myseq),
174 EXTRACT_32BITS(&slarp->un.keep.yourseq),
175 EXTRACT_16BITS(&slarp->un.keep.rel)));
177 if (length >= SLARP_MAX_LEN) { /* uptime-stamp is optional */
180 sec = EXTRACT_32BITS(cp) / 1000;
181 min = sec / 60; sec -= min * 60;
182 hrs = min / 60; min -= hrs * 60;
183 days = hrs / 24; hrs -= days * 24;
184 ND_PRINT((ndo, ", link uptime=%ud%uh%um%us",days,hrs,min,sec));
188 ND_PRINT((ndo, "0x%02x unknown", EXTRACT_32BITS(&slarp->code)));
189 if (ndo->ndo_vflag <= 1)
190 print_unknown_data(ndo,cp+4,"\n\t",length-4);
194 if (SLARP_MAX_LEN < length && ndo->ndo_vflag)
195 ND_PRINT((ndo, ", (trailing junk: %d bytes)", length - SLARP_MAX_LEN));
196 if (ndo->ndo_vflag > 1)
197 print_unknown_data(ndo,cp+4,"\n\t",length-4);
201 ND_PRINT((ndo, "[|slarp]"));
207 * c-style: whitesmith