2 * Copyright (c) 1992, 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)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
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.
21 * Code by Matt Thomas, Digital Equipment Corporation
22 * with an awful lot of hacking by Jeffrey Mogul, DECWRL
26 static const char rcsid[] =
27 "@(#) $Header: print-llc.c,v 1.24 97/01/01 20:56:48 leres Exp $";
30 #include <sys/param.h>
33 #include <netinet/in.h>
40 #include "interface.h"
41 #include "addrtoname.h"
42 #include "extract.h" /* must come after interface.h */
46 static struct tok cmd2str[] = {
53 { LLC_SABME, "sabme" },
59 * Returns non-zero IFF it succeeds in printing the header
62 llc_print(const u_char *p, u_int length, u_int caplen,
63 const u_char *esrc, const u_char *edst)
70 (void)printf("[|llc]");
71 default_print((u_char *)p, caplen);
75 /* Watch out for possible alignment problems */
76 memcpy((char *)&llc, (char *)p, min(caplen, sizeof(llc)));
78 if (llc.ssap == LLCSAP_GLOBAL && llc.dsap == LLCSAP_GLOBAL) {
83 else if (p[0] == 0xf0 && p[1] == 0xf0)
84 netbios_print(p, length);
86 if (llc.ssap == LLCSAP_ISONS && llc.dsap == LLCSAP_ISONS
87 && llc.llcui == LLC_UI) {
88 isoclns_print(p + 3, length - 3, caplen - 3, esrc, edst);
92 if (llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP
93 && llc.llcui == LLC_UI) {
94 if (caplen < sizeof(llc)) {
95 (void)printf("[|llc-snap]");
96 default_print((u_char *)p, caplen);
100 (void)printf("snap %s ", protoid_string(llc.llcpi));
102 caplen -= sizeof(llc);
103 length -= sizeof(llc);
106 /* This is an encapsulated Ethernet packet */
107 et = EXTRACT_16BITS(&llc.ethertype[0]);
108 ret = ether_encap_print(et, p, length, caplen);
113 if ((llc.ssap & ~LLC_GSAP) == llc.dsap) {
115 (void)printf("%s ", llcsap_string(llc.dsap));
117 (void)printf("%s > %s %s ",
118 etheraddr_string(esrc),
119 etheraddr_string(edst),
120 llcsap_string(llc.dsap));
123 (void)printf("%s > %s ",
124 llcsap_string(llc.ssap & ~LLC_GSAP),
125 llcsap_string(llc.dsap));
127 (void)printf("%s %s > %s %s ",
128 etheraddr_string(esrc),
129 llcsap_string(llc.ssap & ~LLC_GSAP),
130 etheraddr_string(edst),
131 llcsap_string(llc.dsap));
134 if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) {
137 m = tok2str(cmd2str, "%02x", LLC_U_CMD(llc.llcu));
138 switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) {
139 case 0: f = 'C'; break;
140 case LLC_GSAP: f = 'R'; break;
141 case LLC_U_POLL: f = 'P'; break;
142 case LLC_GSAP|LLC_U_POLL: f = 'F'; break;
143 default: f = '?'; break;
146 printf("%s/%c", m, f);
152 if ((llc.llcu & ~LLC_U_POLL) == LLC_XID) {
153 if (*p == LLC_XID_FI) {
154 printf(": %02x %02x", p[1], p[2]);
162 llc.llcis = ntohs(llc.llcis);
163 switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) {
164 case 0: f = 'C'; break;
165 case LLC_GSAP: f = 'R'; break;
166 case LLC_U_POLL: f = 'P'; break;
167 case LLC_GSAP|LLC_U_POLL: f = 'F'; break;
168 default: f = '?'; break;
171 if ((llc.llcu & LLC_S_FMT) == LLC_S_FMT) {
172 static char *llc_s[] = { "rr", "rej", "rnr", "03" };
173 (void)printf("%s (r=%d,%c)",
174 llc_s[LLC_S_CMD(llc.llcis)],
175 LLC_IS_NR(llc.llcis),
178 (void)printf("I (s=%d,r=%d,%c)",
180 LLC_IS_NR(llc.llcis),
187 (void)printf(" len=%d", length);
188 if (caplen > 0 && !qflag) {
189 default_print_unaligned(p, caplen);