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
35 struct 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
42 struct 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
49 static 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
69 static void
lane_hdr_print(netdissect_options * ndo,const u_char * bp)70 lane_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 */
78 void
lane_print(netdissect_options * ndo,const u_char * p,u_int length,u_int caplen)79 lane_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