1/*
2 * Marko Kiiskila carnil@cs.tut.fi
3 *
4 * Tampere University of Technology - Telecommunications Laboratory
5 *
6 * Permission to use, copy, modify and distribute this
7 * software and its documentation is hereby granted,
8 * provided that both the copyright notice and this
9 * permission notice appear in all copies of the software,
10 * derivative works or modified versions, and any portions
11 * thereof, that both notices appear in supporting
12 * documentation, and that the use of this software is
13 * acknowledged in any publications resulting from using
14 * the software.
15 *
16 * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
17 * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
18 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
19 * SOFTWARE.
20 *
21 */
22
23/* \summary: ATM LANE printer */
24
25#ifdef HAVE_CONFIG_H
26#include "config.h"
27#endif
28
29#include <netdissect-stdinc.h>
30
31#include "netdissect.h"
32#include "extract.h"
33#include "ether.h"
34
35struct lecdatahdr_8023 {
36  uint16_t le_header;
37  uint8_t h_dest[ETHER_ADDR_LEN];
38  uint8_t h_source[ETHER_ADDR_LEN];
39  uint16_t h_type;
40};
41
42struct lane_controlhdr {
43  uint16_t lec_header;
44  uint8_t lec_proto;
45  uint8_t lec_vers;
46  uint16_t lec_opcode;
47};
48
49static const struct tok lecop2str[] = {
50	{ 0x0001,	"configure request" },
51	{ 0x0101,	"configure response" },
52	{ 0x0002,	"join request" },
53	{ 0x0102,	"join response" },
54	{ 0x0003,	"ready query" },
55	{ 0x0103,	"ready indication" },
56	{ 0x0004,	"register request" },
57	{ 0x0104,	"register response" },
58	{ 0x0005,	"unregister request" },
59	{ 0x0105,	"unregister response" },
60	{ 0x0006,	"ARP request" },
61	{ 0x0106,	"ARP response" },
62	{ 0x0007,	"flush request" },
63	{ 0x0107,	"flush response" },
64	{ 0x0008,	"NARP request" },
65	{ 0x0009,	"topology request" },
66	{ 0,		NULL }
67};
68
69static void
70lane_hdr_print(netdissect_options *ndo, const u_char *bp)
71{
72	ND_PRINT((ndo, "lecid:%x ", EXTRACT_16BITS(bp)));
73}
74
75/*
76 * This is the top level routine of the printer.  'p' points
77 * to the LANE header of the packet, 'h->ts' is the timestamp,
78 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
79 * is the number of bytes actually captured.
80 *
81 * This assumes 802.3, not 802.5, LAN emulation.
82 */
83void
84lane_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
85{
86	const struct lane_controlhdr *lec;
87
88	if (caplen < sizeof(struct lane_controlhdr)) {
89		ND_PRINT((ndo, "[|lane]"));
90		return;
91	}
92
93	lec = (const struct lane_controlhdr *)p;
94	if (EXTRACT_16BITS(&lec->lec_header) == 0xff00) {
95		/*
96		 * LE Control.
97		 */
98		ND_PRINT((ndo, "lec: proto %x vers %x %s",
99		    lec->lec_proto, lec->lec_vers,
100		    tok2str(lecop2str, "opcode-#%u", EXTRACT_16BITS(&lec->lec_opcode))));
101		return;
102	}
103
104	/*
105	 * Go past the LE header.
106	 */
107	length -= 2;
108	caplen -= 2;
109	p += 2;
110
111	/*
112	 * Now print the encapsulated frame, under the assumption
113	 * that it's an Ethernet frame.
114	 */
115	ether_print(ndo, p, length, caplen, lane_hdr_print, p - 2);
116}
117
118u_int
119lane_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
120{
121	lane_print(ndo, p, h->len, h->caplen);
122
123	return (sizeof(struct lecdatahdr_8023));
124}
125