1 /* 2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * Hacked version of print-ether.c Larry Lile <lile@stdio.com> 22 * 23 * Further tweaked to more closely resemble print-fddi.c 24 * Guy Harris <guy@alum.mit.edu> 25 */ 26 #include <sys/cdefs.h> 27 #ifndef lint 28 #if 0 29 static const char rcsid[] _U_ = 30 "@(#) Header: /tcpdump/master/tcpdump/print-token.c,v 1.27 2005-11-13 12:12:43 guy Exp"; 31 #else 32 __RCSID("$NetBSD: print-token.c,v 1.2 2010/12/05 05:11:31 christos Exp $"); 33 #endif 34 #endif 35 36 #ifdef HAVE_CONFIG_H 37 #include "config.h" 38 #endif 39 40 #include <tcpdump-stdinc.h> 41 42 #include <pcap.h> 43 #include <stdio.h> 44 #include <string.h> 45 46 #include "interface.h" 47 #include "extract.h" 48 #include "addrtoname.h" 49 #include "ethertype.h" 50 51 #include "ether.h" 52 #include "token.h" 53 54 /* Extract src, dst addresses */ 55 static inline void 56 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst) 57 { 58 memcpy(fdst, (const char *)trp->token_dhost, 6); 59 memcpy(fsrc, (const char *)trp->token_shost, 6); 60 } 61 62 /* 63 * Print the TR MAC header 64 */ 65 static inline void 66 token_hdr_print(register const struct token_header *trp, register u_int length, 67 register const u_char *fsrc, register const u_char *fdst) 68 { 69 const char *srcname, *dstname; 70 71 srcname = etheraddr_string(fsrc); 72 dstname = etheraddr_string(fdst); 73 74 if (vflag) 75 (void) printf("%02x %02x %s %s %d: ", 76 trp->token_ac, 77 trp->token_fc, 78 srcname, dstname, 79 length); 80 else 81 printf("%s %s %d: ", srcname, dstname, length); 82 } 83 84 static const char *broadcast_indicator[] = { 85 "Non-Broadcast", "Non-Broadcast", 86 "Non-Broadcast", "Non-Broadcast", 87 "All-routes", "All-routes", 88 "Single-route", "Single-route" 89 }; 90 91 static const char *direction[] = { 92 "Forward", "Backward" 93 }; 94 95 static const char *largest_frame[] = { 96 "516", 97 "1500", 98 "2052", 99 "4472", 100 "8144", 101 "11407", 102 "17800", 103 "??" 104 }; 105 106 u_int 107 token_print(const u_char *p, u_int length, u_int caplen) 108 { 109 const struct token_header *trp; 110 u_short extracted_ethertype; 111 struct ether_header ehdr; 112 u_int route_len = 0, hdr_len = TOKEN_HDRLEN; 113 int seg; 114 115 trp = (const struct token_header *)p; 116 117 if (caplen < TOKEN_HDRLEN) { 118 printf("[|token-ring]"); 119 return hdr_len; 120 } 121 122 /* 123 * Get the TR addresses into a canonical form 124 */ 125 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr)); 126 127 /* Adjust for source routing information in the MAC header */ 128 if (IS_SOURCE_ROUTED(trp)) { 129 /* Clear source-routed bit */ 130 *ESRC(&ehdr) &= 0x7f; 131 132 if (eflag) 133 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); 134 135 if (caplen < TOKEN_HDRLEN + 2) { 136 printf("[|token-ring]"); 137 return hdr_len; 138 } 139 route_len = RIF_LENGTH(trp); 140 hdr_len += route_len; 141 if (caplen < hdr_len) { 142 printf("[|token-ring]"); 143 return hdr_len; 144 } 145 if (vflag) { 146 printf("%s ", broadcast_indicator[BROADCAST(trp)]); 147 printf("%s", direction[DIRECTION(trp)]); 148 149 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 150 printf(" [%d:%d]", RING_NUMBER(trp, seg), 151 BRIDGE_NUMBER(trp, seg)); 152 } else { 153 printf("rt = %x", EXTRACT_16BITS(&trp->token_rcf)); 154 155 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 156 printf(":%x", EXTRACT_16BITS(&trp->token_rseg[seg])); 157 } 158 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]); 159 } else { 160 if (eflag) 161 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); 162 } 163 164 /* Skip over token ring MAC header and routing information */ 165 length -= hdr_len; 166 p += hdr_len; 167 caplen -= hdr_len; 168 169 /* Frame Control field determines interpretation of packet */ 170 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) { 171 /* Try to print the LLC-layer header & higher layers */ 172 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr), 173 &extracted_ethertype) == 0) { 174 /* ether_type not known, print raw packet */ 175 if (!eflag) 176 token_hdr_print(trp, 177 length + TOKEN_HDRLEN + route_len, 178 ESRC(&ehdr), EDST(&ehdr)); 179 if (extracted_ethertype) { 180 printf("(LLC %s) ", 181 etherproto_string(htons(extracted_ethertype))); 182 } 183 if (!suppress_default_print) 184 default_print(p, caplen); 185 } 186 } else { 187 /* Some kinds of TR packet we cannot handle intelligently */ 188 /* XXX - dissect MAC packets if frame type is 0 */ 189 if (!eflag) 190 token_hdr_print(trp, length + TOKEN_HDRLEN + route_len, 191 ESRC(&ehdr), EDST(&ehdr)); 192 if (!suppress_default_print) 193 default_print(p, caplen); 194 } 195 return (hdr_len); 196 } 197 198 /* 199 * This is the top level routine of the printer. 'p' points 200 * to the TR header of the packet, 'h->ts' is the timestamp, 201 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 202 * is the number of bytes actually captured. 203 */ 204 u_int 205 token_if_print(const struct pcap_pkthdr *h, const u_char *p) 206 { 207 return (token_print(p, h->len, h->caplen)); 208 } 209