xref: /freebsd/contrib/tcpdump/print-atm.c (revision 74bf4e164ba5851606a27d4feff27717452583e5)
1 /*
2  * Copyright (c) 1994, 1995, 1996, 1997
3  *	The Regents of the University of California.  All rights reserved.
4  *
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
16  * written permission.
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.
20  *
21  * $FreeBSD$
22  */
23 #ifndef lint
24 static const char rcsid[] _U_ =
25     "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.33.2.2 2003/11/16 08:51:11 guy Exp $ (LBL)";
26 #endif
27 
28 #ifdef HAVE_CONFIG_H
29 #include "config.h"
30 #endif
31 
32 #include <tcpdump-stdinc.h>
33 
34 #include <stdio.h>
35 #include <pcap.h>
36 #include <string.h>
37 
38 #include "interface.h"
39 #include "extract.h"
40 #include "addrtoname.h"
41 #include "ethertype.h"
42 #include "atm.h"
43 #include "atmuni31.h"
44 #include "llc.h"
45 
46 #include "ether.h"
47 
48 /*
49  * Print an RFC 1483 LLC-encapsulated ATM frame.
50  */
51 static void
52 atm_llc_print(const u_char *p, int length, int caplen)
53 {
54 	u_short extracted_ethertype;
55 
56 	if (!llc_print(p, length, caplen, NULL, NULL,
57 	    &extracted_ethertype)) {
58 		/* ether_type not known, print raw packet */
59 		if (extracted_ethertype) {
60 			printf("(LLC %s) ",
61 		etherproto_string(htons(extracted_ethertype)));
62 		}
63 		if (!xflag && !qflag)
64 			default_print(p, caplen);
65 	}
66 }
67 
68 /*
69  * Given a SAP value, generate the LLC header value for a UI packet
70  * with that SAP as the source and destination SAP.
71  */
72 #define LLC_UI_HDR(sap)	((sap)<<16 | (sap<<8) | 0x03)
73 
74 /*
75  * This is the top level routine of the printer.  'p' points
76  * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
77  * 'h->length' is the length of the packet off the wire, and 'h->caplen'
78  * is the number of bytes actually captured.
79  */
80 u_int
81 atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
82 {
83 	u_int caplen = h->caplen;
84 	u_int length = h->len;
85 	u_int32_t llchdr;
86 	u_int hdrlen = 0;
87 
88 	if (caplen < 8) {
89 		printf("[|atm]");
90 		return (caplen);
91 	}
92 	/*
93 	 * Extract the presumed LLC header into a variable, for quick
94 	 * testing.
95 	 * Then check for a header that's neither a header for a SNAP
96 	 * packet nor an RFC 2684 routed NLPID-formatted PDU nor
97 	 * an 802.2-but-no-SNAP IP packet.
98 	 */
99 	llchdr = EXTRACT_24BITS(p);
100 	if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
101 	    llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
102 	    llchdr != LLC_UI_HDR(LLCSAP_IP)) {
103 		/*
104 		 * XXX - assume 802.6 MAC header from Fore driver.
105 		 *
106 		 * Unfortunately, the above list doesn't check for
107 		 * all known SAPs, doesn't check for headers where
108 		 * the source and destination SAP aren't the same,
109 		 * and doesn't check for non-UI frames.  It also
110 		 * runs the risk of an 802.6 MAC header that happens
111 		 * to begin with one of those values being
112 		 * incorrectly treated as an 802.2 header.
113 		 *
114 		 * So is that Fore driver still around?  And, if so,
115 		 * is it still putting 802.6 MAC headers on ATM
116 		 * packets?  If so, could it be changed to use a
117 		 * new DLT_IEEE802_6 value if we added it?
118 		 */
119 		if (eflag)
120 			printf("%08x%08x %08x%08x ",
121 			       EXTRACT_32BITS(p),
122 			       EXTRACT_32BITS(p+4),
123 			       EXTRACT_32BITS(p+8),
124 			       EXTRACT_32BITS(p+12));
125 		p += 20;
126 		length -= 20;
127 		caplen -= 20;
128 		hdrlen += 20;
129 	}
130 	atm_llc_print(p, length, caplen);
131 	return (hdrlen);
132 }
133 
134 /*
135  * ATM signalling.
136  */
137 static struct tok msgtype2str[] = {
138 	{ CALL_PROCEED,		"Call_proceeding" },
139 	{ CONNECT,		"Connect" },
140 	{ CONNECT_ACK,		"Connect_ack" },
141 	{ SETUP,		"Setup" },
142 	{ RELEASE,		"Release" },
143 	{ RELEASE_DONE,		"Release_complete" },
144 	{ RESTART,		"Restart" },
145 	{ RESTART_ACK,		"Restart_ack" },
146 	{ STATUS,		"Status" },
147 	{ STATUS_ENQ,		"Status_enquiry" },
148 	{ ADD_PARTY,		"Add_party" },
149 	{ ADD_PARTY_ACK,	"Add_party_ack" },
150 	{ ADD_PARTY_REJ,	"Add_party_reject" },
151 	{ DROP_PARTY,		"Drop_party" },
152 	{ DROP_PARTY_ACK,	"Drop_party_ack" },
153 	{ 0,			NULL }
154 };
155 
156 static void
157 sig_print(const u_char *p, int caplen)
158 {
159 	bpf_u_int32 call_ref;
160 
161 	if (caplen < PROTO_POS) {
162 		printf("[|atm]");
163 		return;
164 	}
165 	if (p[PROTO_POS] == Q2931) {
166 		/*
167 		 * protocol:Q.2931 for User to Network Interface
168 		 * (UNI 3.1) signalling
169 		 */
170 		printf("Q.2931");
171 		if (caplen < MSG_TYPE_POS) {
172 			printf(" [|atm]");
173 			return;
174 		}
175 		printf(":%s ",
176 		    tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
177 
178 		if (caplen < CALL_REF_POS+3) {
179 			printf("[|atm]");
180 			return;
181 		}
182 		call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
183 		printf("CALL_REF:0x%06x", call_ref);
184 	} else {
185 		/* SCCOP with some unknown protocol atop it */
186 		printf("SSCOP, proto %d ", p[PROTO_POS]);
187 	}
188 }
189 
190 /*
191  * Print an ATM PDU (such as an AAL5 PDU).
192  */
193 void
194 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
195     u_int caplen)
196 {
197 	if (eflag)
198 		printf("VPI:%u VCI:%u ", vpi, vci);
199 
200 	if (vpi == 0) {
201 		switch (vci) {
202 
203 		case PPC:
204 			sig_print(p, caplen);
205 			return;
206 
207 		case BCC:
208 			printf("broadcast sig: ");
209 			return;
210 
211 		case OAMF4SC:
212 			printf("oamF4(segment): ");
213 			return;
214 
215 		case OAMF4EC:
216 			printf("oamF4(end): ");
217 			return;
218 
219 		case METAC:
220 			printf("meta: ");
221 			return;
222 
223 		case ILMIC:
224 			printf("ilmi: ");
225 			snmp_print(p, length);
226 			return;
227 		}
228 	}
229 
230 	switch (traftype) {
231 
232 	case ATM_LLC:
233 	default:
234 		/*
235 		 * Assumes traffic is LLC if unknown.
236 		 */
237 		atm_llc_print(p, length, caplen);
238 		break;
239 
240 	case ATM_LANE:
241 		lane_print(p, length, caplen);
242 		break;
243 	}
244 }
245