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#define ND_LONGJMP_FROM_TCHECK
32#include "netdissect.h"
33#include "extract.h"
34
35struct lecdatahdr_8023 {
36  nd_uint16_t le_header;
37  nd_mac_addr h_dest;
38  nd_mac_addr h_source;
39  nd_uint16_t h_type;
40};
41
42struct lane_controlhdr {
43  nd_uint16_t lec_header;
44  nd_uint8_t  lec_proto;
45  nd_uint8_t  lec_vers;
46  nd_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("lecid:%x ", GET_BE_U_2(bp));
73}
74
75/*
76 * This assumes 802.3, not 802.5, LAN emulation.
77 */
78void
79lane_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
80{
81	const struct lane_controlhdr *lec;
82
83	ndo->ndo_protocol = "lane";
84
85	lec = (const struct lane_controlhdr *)p;
86	if (GET_BE_U_2(lec->lec_header) == 0xff00) {
87		/*
88		 * LE Control.
89		 */
90		ND_PRINT("lec: proto %x vers %x %s",
91			 GET_U_1(lec->lec_proto),
92			 GET_U_1(lec->lec_vers),
93			 tok2str(lecop2str, "opcode-#%u", GET_BE_U_2(lec->lec_opcode)));
94		return;
95	}
96
97	/*
98	 * Go past the LE header.
99	 */
100	ND_TCHECK_2(p); /* Needed */
101	length -= 2;
102	caplen -= 2;
103	p += 2;
104
105	/*
106	 * Now print the encapsulated frame, under the assumption
107	 * that it's an Ethernet frame.
108	 */
109	ether_print(ndo, p, length, caplen, lane_hdr_print, p - 2);
110}
111