1 /* maybe it should be merged into print-ppp.c */
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13 * ``This product includes software developed by the University of California,
14 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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24 static const char rcsid[] =
25 "@(#) $Header: /tcpdump/master/tcpdump/print-chdlc.c,v 1.11 2000/10/09 01:53:19 guy Exp $ (LBL)";
32 #include <sys/param.h>
35 #include <netinet/in.h>
42 #include "interface.h"
43 #include "addrtoname.h"
44 #include "ethertype.h"
48 static void chdlc_slarp_print(const u_char *, u_int);
50 /* Standard CHDLC printer */
52 chdlc_if_print(u_char *user, const struct pcap_pkthdr *h,
53 register const u_char *p)
55 register u_int length = h->len;
56 register u_int caplen = h->caplen;
62 if (caplen < CHDLC_HDRLEN) {
68 * Some printers want to get back at the link level addresses,
69 * and/or check that they're not walking off the end of the packet.
70 * Rather than pass them all the way down, we set these globals.
72 proto = ntohs(*(u_short *)&p[2]);
85 printf("0x%02x ", p[0]);
88 printf("%d %04x: ", length, proto);
91 length -= CHDLC_HDRLEN;
92 ip = (struct ip *)(p + CHDLC_HDRLEN);
95 ip_print((const u_char *)ip, length);
99 ip6_print((const u_char *)ip, length);
102 case CHDLC_TYPE_SLARP:
103 chdlc_slarp_print((const u_char *)ip, length);
107 chdlc_cdp_print((const u_char *)ip, length);
112 default_print((const u_char *)ip, caplen - CHDLC_HDRLEN);
119 #define SLARP_REQUEST 0
120 #define SLARP_REPLY 1
121 #define SLARP_KEEPALIVE 2
141 chdlc_slarp_print(const u_char *cp, u_int length)
143 struct cisco_slarp *slarp;
145 if (length < SLARP_LEN) {
150 slarp = (struct cisco_slarp *)cp;
151 switch (ntohl(slarp->code)) {
153 printf("slarp-request");
156 printf("slarp-reply %s/%s",
157 ipaddr_string(&slarp->un.addr.addr),
158 ipaddr_string(&slarp->un.addr.mask));
160 case SLARP_KEEPALIVE:
161 printf("slarp-keepalive my=0x%x your=0x%x ",
162 (u_int32_t)ntohl(slarp->un.keep.myseq),
163 (u_int32_t)ntohl(slarp->un.keep.yourseq));
164 printf("reliability=0x%04x t1=%d.%d",
165 ntohs(slarp->un.keep.rel), ntohs(slarp->un.keep.t1),
166 ntohs(slarp->un.keep.t2));
169 printf("slarp-0x%x unknown", (u_int32_t)ntohl(slarp->code));
173 if (SLARP_LEN < length && vflag)
174 printf("(trailing junk: %d bytes)", length - SLARP_LEN);