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 #include <sys/cdefs.h>
24 #ifndef lint
25 __RCSID("$NetBSD: print-lane.c,v 1.8 2024/09/02 16:15:31 christos Exp $");
26 #endif
27 
28 /* \summary: ATM LANE printer */
29 
30 #include <config.h>
31 
32 #include "netdissect-stdinc.h"
33 
34 #define ND_LONGJMP_FROM_TCHECK
35 #include "netdissect.h"
36 #include "extract.h"
37 
38 struct lecdatahdr_8023 {
39   nd_uint16_t le_header;
40   nd_mac_addr h_dest;
41   nd_mac_addr h_source;
42   nd_uint16_t h_type;
43 };
44 
45 struct lane_controlhdr {
46   nd_uint16_t lec_header;
47   nd_uint8_t  lec_proto;
48   nd_uint8_t  lec_vers;
49   nd_uint16_t lec_opcode;
50 };
51 
52 static const struct tok lecop2str[] = {
53           { 0x0001, "configure request" },
54           { 0x0101, "configure response" },
55           { 0x0002, "join request" },
56           { 0x0102, "join response" },
57           { 0x0003, "ready query" },
58           { 0x0103, "ready indication" },
59           { 0x0004, "register request" },
60           { 0x0104, "register response" },
61           { 0x0005, "unregister request" },
62           { 0x0105, "unregister response" },
63           { 0x0006, "ARP request" },
64           { 0x0106, "ARP response" },
65           { 0x0007, "flush request" },
66           { 0x0107, "flush response" },
67           { 0x0008, "NARP request" },
68           { 0x0009, "topology request" },
69           { 0,                NULL }
70 };
71 
72 static void
lane_hdr_print(netdissect_options * ndo,const u_char * bp)73 lane_hdr_print(netdissect_options *ndo, const u_char *bp)
74 {
75           ND_PRINT("lecid:%x ", GET_BE_U_2(bp));
76 }
77 
78 /*
79  * This assumes 802.3, not 802.5, LAN emulation.
80  */
81 void
lane_print(netdissect_options * ndo,const u_char * p,u_int length,u_int caplen)82 lane_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
83 {
84           const struct lane_controlhdr *lec;
85 
86           ndo->ndo_protocol = "lane";
87 
88           lec = (const struct lane_controlhdr *)p;
89           if (GET_BE_U_2(lec->lec_header) == 0xff00) {
90                     /*
91                      * LE Control.
92                      */
93                     ND_PRINT("lec: proto %x vers %x %s",
94                                GET_U_1(lec->lec_proto),
95                                GET_U_1(lec->lec_vers),
96                                tok2str(lecop2str, "opcode-#%u", GET_BE_U_2(lec->lec_opcode)));
97                     return;
98           }
99 
100           /*
101            * Go past the LE header.
102            */
103           ND_TCHECK_2(p); /* Needed */
104           length -= 2;
105           caplen -= 2;
106           p += 2;
107 
108           /*
109            * Now print the encapsulated frame, under the assumption
110            * that it's an Ethernet frame.
111            */
112           ether_print(ndo, p, length, caplen, lane_hdr_print, p - 2);
113 }
114