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
35 struct 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
42 struct lane_controlhdr {
43 uint16_t lec_header;
44 uint8_t lec_proto;
45 uint8_t lec_vers;
46 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((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 */
83 void
lane_print(netdissect_options * ndo,const u_char * p,u_int length,u_int caplen)84 lane_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
118 u_int
lane_if_print(netdissect_options * ndo,const struct pcap_pkthdr * h,const u_char * p)119 lane_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