print-atm.c revision 146778 
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: head/contrib/tcpdump/print-atm.c 146778 2005-05-29 19:09:28Z sam $
22 */
23#ifndef lint
24static const char rcsid[] _U_ =
25    "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.38 2005/01/19 16:46:27 hannes 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
48struct tok oam_celltype_values[] = {
49    { 0x1, "Fault Management" },
50    { 0x2, "Performance Management" },
51    { 0x8, "activate/deactivate" },
52    { 0xf, "System Management" },
53    { 0, NULL }
54};
55
56struct tok oam_fm_functype_values[] = {
57    { 0x0, "AIS" },
58    { 0x1, "RDI" },
59    { 0x4, "Continuity Check" },
60    { 0x8, "Loopback" },
61    { 0, NULL }
62};
63
64struct tok oam_pm_functype_values[] = {
65    { 0x0, "Forward Monitoring" },
66    { 0x1, "Backward Reporting" },
67    { 0x2, "Monitoring and Reporting" },
68    { 0, NULL }
69};
70
71struct tok oam_ad_functype_values[] = {
72    { 0x0, "Performance Monitoring" },
73    { 0x1, "Continuity Check" },
74    { 0, NULL }
75};
76
77static const struct tok *oam_functype_values[16] = {
78    NULL,
79    oam_fm_functype_values, /* 1 */
80    oam_pm_functype_values, /* 2 */
81    NULL,
82    NULL,
83    NULL,
84    NULL,
85    NULL,
86    oam_ad_functype_values, /* 8 */
87    NULL,
88    NULL,
89    NULL,
90    NULL,
91    NULL,
92    NULL,
93    NULL
94};
95
96/*
97 * Print an RFC 1483 LLC-encapsulated ATM frame.
98 */
99static void
100atm_llc_print(const u_char *p, int length, int caplen)
101{
102	u_short extracted_ethertype;
103
104	if (!llc_print(p, length, caplen, NULL, NULL,
105	    &extracted_ethertype)) {
106		/* ether_type not known, print raw packet */
107		if (extracted_ethertype) {
108			printf("(LLC %s) ",
109		etherproto_string(htons(extracted_ethertype)));
110		}
111		if (!xflag && !qflag)
112			default_print(p, caplen);
113	}
114}
115
116/*
117 * Given a SAP value, generate the LLC header value for a UI packet
118 * with that SAP as the source and destination SAP.
119 */
120#define LLC_UI_HDR(sap)	((sap)<<16 | (sap<<8) | 0x03)
121
122/*
123 * This is the top level routine of the printer.  'p' points
124 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp,
125 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
126 * is the number of bytes actually captured.
127 */
128u_int
129atm_if_print(const struct pcap_pkthdr *h, const u_char *p)
130{
131	u_int caplen = h->caplen;
132	u_int length = h->len;
133	u_int32_t llchdr;
134	u_int hdrlen = 0;
135
136	if (caplen < 8) {
137		printf("[|atm]");
138		return (caplen);
139	}
140	/*
141	 * Extract the presumed LLC header into a variable, for quick
142	 * testing.
143	 * Then check for a header that's neither a header for a SNAP
144	 * packet nor an RFC 2684 routed NLPID-formatted PDU nor
145	 * an 802.2-but-no-SNAP IP packet.
146	 */
147	llchdr = EXTRACT_24BITS(p);
148	if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) &&
149	    llchdr != LLC_UI_HDR(LLCSAP_ISONS) &&
150	    llchdr != LLC_UI_HDR(LLCSAP_IP)) {
151		/*
152		 * XXX - assume 802.6 MAC header from Fore driver.
153		 *
154		 * Unfortunately, the above list doesn't check for
155		 * all known SAPs, doesn't check for headers where
156		 * the source and destination SAP aren't the same,
157		 * and doesn't check for non-UI frames.  It also
158		 * runs the risk of an 802.6 MAC header that happens
159		 * to begin with one of those values being
160		 * incorrectly treated as an 802.2 header.
161		 *
162		 * So is that Fore driver still around?  And, if so,
163		 * is it still putting 802.6 MAC headers on ATM
164		 * packets?  If so, could it be changed to use a
165		 * new DLT_IEEE802_6 value if we added it?
166		 */
167		if (eflag)
168			printf("%08x%08x %08x%08x ",
169			       EXTRACT_32BITS(p),
170			       EXTRACT_32BITS(p+4),
171			       EXTRACT_32BITS(p+8),
172			       EXTRACT_32BITS(p+12));
173		p += 20;
174		length -= 20;
175		caplen -= 20;
176		hdrlen += 20;
177	}
178	atm_llc_print(p, length, caplen);
179	return (hdrlen);
180}
181
182/*
183 * ATM signalling.
184 */
185static struct tok msgtype2str[] = {
186	{ CALL_PROCEED,		"Call_proceeding" },
187	{ CONNECT,		"Connect" },
188	{ CONNECT_ACK,		"Connect_ack" },
189	{ SETUP,		"Setup" },
190	{ RELEASE,		"Release" },
191	{ RELEASE_DONE,		"Release_complete" },
192	{ RESTART,		"Restart" },
193	{ RESTART_ACK,		"Restart_ack" },
194	{ STATUS,		"Status" },
195	{ STATUS_ENQ,		"Status_enquiry" },
196	{ ADD_PARTY,		"Add_party" },
197	{ ADD_PARTY_ACK,	"Add_party_ack" },
198	{ ADD_PARTY_REJ,	"Add_party_reject" },
199	{ DROP_PARTY,		"Drop_party" },
200	{ DROP_PARTY_ACK,	"Drop_party_ack" },
201	{ 0,			NULL }
202};
203
204static void
205sig_print(const u_char *p, int caplen)
206{
207	bpf_u_int32 call_ref;
208
209	if (caplen < PROTO_POS) {
210		printf("[|atm]");
211		return;
212	}
213	if (p[PROTO_POS] == Q2931) {
214		/*
215		 * protocol:Q.2931 for User to Network Interface
216		 * (UNI 3.1) signalling
217		 */
218		printf("Q.2931");
219		if (caplen < MSG_TYPE_POS) {
220			printf(" [|atm]");
221			return;
222		}
223		printf(":%s ",
224		    tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]));
225
226		if (caplen < CALL_REF_POS+3) {
227			printf("[|atm]");
228			return;
229		}
230		call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]);
231		printf("CALL_REF:0x%06x", call_ref);
232	} else {
233		/* SCCOP with some unknown protocol atop it */
234		printf("SSCOP, proto %d ", p[PROTO_POS]);
235	}
236}
237
238/*
239 * Print an ATM PDU (such as an AAL5 PDU).
240 */
241void
242atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length,
243    u_int caplen)
244{
245	if (eflag)
246		printf("VPI:%u VCI:%u ", vpi, vci);
247
248	if (vpi == 0) {
249		switch (vci) {
250
251		case PPC:
252			sig_print(p, caplen);
253			return;
254
255		case BCC:
256			printf("broadcast sig: ");
257			return;
258
259		case OAMF4SC: /* fall through */
260		case OAMF4EC:
261                        oam_print(p, length);
262			return;
263
264		case METAC:
265			printf("meta: ");
266			return;
267
268		case ILMIC:
269			printf("ilmi: ");
270			snmp_print(p, length);
271			return;
272		}
273	}
274
275	switch (traftype) {
276
277	case ATM_LLC:
278	default:
279		/*
280		 * Assumes traffic is LLC if unknown.
281		 */
282		atm_llc_print(p, length, caplen);
283		break;
284
285	case ATM_LANE:
286		lane_print(p, length, caplen);
287		break;
288	}
289}
290
291int
292oam_print (const u_char *p, u_int length) {
293
294    u_int16_t cell_header, cell_type, func_type,vpi,vci,payload,clp;
295
296    cell_header = EXTRACT_32BITS(p);
297    cell_type = ((*(p+4))>>4) & 0x0f;
298    func_type = *(p) & 0x0f;
299
300    vpi = (cell_header>>20)&0xff;
301    vci = (cell_header>>4)&0xffff;
302    payload = (cell_header>>1)&0x7;
303    clp = cell_header&0x1;
304
305    switch (vci) {
306    case OAMF4SC:
307        printf("OAM F4 (segment), ");
308            break;
309    case OAMF4EC:
310        printf("OAM F4 (end), ");
311        break;
312    default:
313        printf("OAM F5, ");
314        break;
315    }
316
317    if (eflag)
318        printf("vpi %u, vci %u, payload %u, clp %u, ",vpi,vci,payload,clp);
319
320    printf("cell-type %s (%u)",
321           tok2str(oam_celltype_values, "unknown", cell_type),
322           cell_type);
323
324    if (oam_functype_values[cell_type] == NULL)
325        printf(", func-type unknown (%u)", func_type);
326    else
327        printf(", func-type %s (%u)",
328               bittok2str(oam_functype_values[cell_type],"none",func_type),
329               func_type);
330
331    printf(", length %u",length);
332    return 1;
333}
334