nexmon – Blame information for rev 1

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1 office 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  
33 #define NETDISSECT_REWORKED
34 #ifdef HAVE_CONFIG_H
35 #include "config.h"
36 #endif
37  
38 #include <tcpdump-stdinc.h>
39  
40 struct mbuf;
41 struct rtentry;
42  
43 #include "interface.h"
44 #include "extract.h"
45  
46 #include "atm.h"
47  
48 /* SunATM header for ATM packet */
49 #define DIR_POS 0 /* Direction (0x80 = transmit, 0x00 = receive) */
50 #define VPI_POS 1 /* VPI */
51 #define VCI_POS 2 /* VCI */
52 #define PKT_BEGIN_POS 4 /* Start of the ATM packet */
53  
54 /* Protocol type values in the bottom for bits of the byte at SUNATM_DIR_POS. */
55 #define PT_LANE 0x01 /* LANE */
56 #define PT_LLC 0x02 /* LLC encapsulation */
57  
58 /*
59 * This is the top level routine of the printer. 'p' points
60 * to the SunATM pseudo-header for the packet, 'h->ts' is the timestamp,
61 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
62 * is the number of bytes actually captured.
63 */
64 u_int
65 sunatm_if_print(netdissect_options *ndo,
66 const struct pcap_pkthdr *h, const u_char *p)
67 {
68 u_int caplen = h->caplen;
69 u_int length = h->len;
70 u_short vci;
71 u_char vpi;
72 u_int traftype;
73  
74 if (caplen < PKT_BEGIN_POS) {
75 ND_PRINT((ndo, "[|atm]"));
76 return (caplen);
77 }
78  
79 if (ndo->ndo_eflag) {
80 ND_PRINT((ndo, p[DIR_POS] & 0x80 ? "Tx: " : "Rx: "));
81 }
82  
83 switch (p[DIR_POS] & 0x0f) {
84  
85 case PT_LANE:
86 traftype = ATM_LANE;
87 break;
88  
89 case PT_LLC:
90 traftype = ATM_LLC;
91 break;
92  
93 default:
94 traftype = ATM_UNKNOWN;
95 break;
96 }
97  
98 vci = EXTRACT_16BITS(&p[VCI_POS]);
99 vpi = p[VPI_POS];
100  
101 p += PKT_BEGIN_POS;
102 caplen -= PKT_BEGIN_POS;
103 length -= PKT_BEGIN_POS;
104 atm_print(ndo, vpi, vci, traftype, p, length, caplen);
105  
106 return (PKT_BEGIN_POS);
107 }