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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 /* \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
     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
     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
    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