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1 /*
2  * Copyright (c) 1997 Yen Yen Lim and North Dakota State University
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *      This product includes software developed by Yen Yen Lim and
16 	North Dakota State University
17  * 4. The name of the author may not be used to endorse or promote products
18  *    derived from this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
24  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
26  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
28  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
29  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30  * POSSIBILITY OF SUCH DAMAGE.
31  */
32 #ifndef lint
33 static const char rcsid[] _U_ =
34     "@(#) $Header: /tcpdump/master/tcpdump/print-sunatm.c,v 1.8 2004/03/17 23:24:38 guy Exp $ (LBL)";
35 #endif
36 
37 #ifdef HAVE_CONFIG_H
38 #include "config.h"
39 #endif
40 
41 #include <tcpdump-stdinc.h>
42 
43 struct mbuf;
44 struct rtentry;
45 
46 #include <stdio.h>
47 #include <pcap.h>
48 
49 #include "interface.h"
50 #include "extract.h"
51 #include "addrtoname.h"
52 
53 #include "atm.h"
54 #include "atmuni31.h"
55 
56 /* SunATM header for ATM packet */
57 #define DIR_POS		0	/* Direction (0x80 = transmit, 0x00 = receive) */
58 #define VPI_POS		1	/* VPI */
59 #define VCI_POS		2	/* VCI */
60 #define PKT_BEGIN_POS   4	/* Start of the ATM packet */
61 
62 /* Protocol type values in the bottom for bits of the byte at SUNATM_DIR_POS. */
63 #define PT_LANE		0x01	/* LANE */
64 #define PT_LLC		0x02	/* LLC encapsulation */
65 
66 /*
67  * This is the top level routine of the printer.  'p' points
68  * to the SunATM pseudo-header for the packet, 'h->ts' is the timestamp,
69  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
70  * is the number of bytes actually captured.
71  */
72 u_int
sunatm_if_print(const struct pcap_pkthdr * h,const u_char * p)73 sunatm_if_print(const struct pcap_pkthdr *h, const u_char *p)
74 {
75 	u_int caplen = h->caplen;
76 	u_int length = h->len;
77 	u_short vci;
78 	u_char vpi;
79 	u_int traftype;
80 
81 	if (caplen < PKT_BEGIN_POS) {
82 		printf("[|atm]");
83 		return (caplen);
84 	}
85 
86 	if (eflag) {
87 		if (p[DIR_POS] & 0x80)
88 			printf("Tx: ");
89 		else
90 			printf("Rx: ");
91 	}
92 
93 	switch (p[DIR_POS] & 0x0f) {
94 
95 	case PT_LANE:
96 		traftype = ATM_LANE;
97 		break;
98 
99 	case PT_LLC:
100 		traftype = ATM_LLC;
101 		break;
102 
103 	default:
104 		traftype = ATM_UNKNOWN;
105 		break;
106 	}
107 
108 	vci = EXTRACT_16BITS(&p[VCI_POS]);
109 	vpi = p[VPI_POS];
110 
111 	p += PKT_BEGIN_POS;
112 	caplen -= PKT_BEGIN_POS;
113 	length -= PKT_BEGIN_POS;
114 	atm_print(vpi, vci, traftype, p, length, caplen);
115 
116 	return (PKT_BEGIN_POS);
117 }
118