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 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