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      1 /*
      2  * Marko Kiiskila carnil (at) 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
     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
     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