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 * $FreeBSD$ 27 */ 28 #ifndef lint 29 static const char rcsid[] _U_ = 30 "@(#) $Header: /tcpdump/master/tcpdump/print-token.c,v 1.25.2.2 2005/11/13 12:13:01 guy Exp $"; 31 #endif 32 33 #ifdef HAVE_CONFIG_H 34 #include "config.h" 35 #endif 36 37 #include <tcpdump-stdinc.h> 38 39 #include <pcap.h> 40 #include <stdio.h> 41 #include <string.h> 42 43 #include "interface.h" 44 #include "addrtoname.h" 45 #include "ethertype.h" 46 47 #include "ether.h" 48 #include "token.h" 49 50 /* Extract src, dst addresses */ 51 static inline void 52 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst) 53 { 54 memcpy(fdst, (const char *)trp->token_dhost, 6); 55 memcpy(fsrc, (const char *)trp->token_shost, 6); 56 } 57 58 /* 59 * Print the TR MAC header 60 */ 61 static inline void 62 token_hdr_print(register const struct token_header *trp, register u_int length, 63 register const u_char *fsrc, register const u_char *fdst) 64 { 65 const char *srcname, *dstname; 66 67 srcname = etheraddr_string(fsrc); 68 dstname = etheraddr_string(fdst); 69 70 if (vflag) 71 (void) printf("%02x %02x %s %s %d: ", 72 trp->token_ac, 73 trp->token_fc, 74 srcname, dstname, 75 length); 76 else 77 printf("%s %s %d: ", srcname, dstname, length); 78 } 79 80 static const char *broadcast_indicator[] = { 81 "Non-Broadcast", "Non-Broadcast", 82 "Non-Broadcast", "Non-Broadcast", 83 "All-routes", "All-routes", 84 "Single-route", "Single-route" 85 }; 86 87 static const char *direction[] = { 88 "Forward", "Backward" 89 }; 90 91 static const char *largest_frame[] = { 92 "516", 93 "1500", 94 "2052", 95 "4472", 96 "8144", 97 "11407", 98 "17800", 99 "??" 100 }; 101 102 u_int 103 token_print(const u_char *p, u_int length, u_int caplen) 104 { 105 const struct token_header *trp; 106 u_short extracted_ethertype; 107 struct ether_header ehdr; 108 u_int route_len = 0, hdr_len = TOKEN_HDRLEN; 109 int seg; 110 111 trp = (const struct token_header *)p; 112 113 if (caplen < TOKEN_HDRLEN) { 114 printf("[|token-ring]"); 115 return hdr_len; 116 } 117 118 /* 119 * Get the TR addresses into a canonical form 120 */ 121 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr)); 122 123 /* Adjust for source routing information in the MAC header */ 124 if (IS_SOURCE_ROUTED(trp)) { 125 /* Clear source-routed bit */ 126 *ESRC(&ehdr) &= 0x7f; 127 128 if (eflag) 129 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); 130 131 route_len = RIF_LENGTH(trp); 132 if (vflag) { 133 printf("%s ", broadcast_indicator[BROADCAST(trp)]); 134 printf("%s", direction[DIRECTION(trp)]); 135 136 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 137 printf(" [%d:%d]", RING_NUMBER(trp, seg), 138 BRIDGE_NUMBER(trp, seg)); 139 } else { 140 printf("rt = %x", ntohs(trp->token_rcf)); 141 142 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 143 printf(":%x", ntohs(trp->token_rseg[seg])); 144 } 145 printf(" (%s) ", largest_frame[LARGEST_FRAME(trp)]); 146 } else { 147 if (eflag) 148 token_hdr_print(trp, length, ESRC(&ehdr), EDST(&ehdr)); 149 } 150 151 /* Skip over token ring MAC header and routing information */ 152 hdr_len += route_len; 153 length -= hdr_len; 154 p += hdr_len; 155 caplen -= hdr_len; 156 157 /* Frame Control field determines interpretation of packet */ 158 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) { 159 /* Try to print the LLC-layer header & higher layers */ 160 if (llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr), 161 &extracted_ethertype) == 0) { 162 /* ether_type not known, print raw packet */ 163 if (!eflag) 164 token_hdr_print(trp, 165 length + TOKEN_HDRLEN + route_len, 166 ESRC(&ehdr), EDST(&ehdr)); 167 if (extracted_ethertype) { 168 printf("(LLC %s) ", 169 etherproto_string(htons(extracted_ethertype))); 170 } 171 if (!suppress_default_print) 172 default_print(p, caplen); 173 } 174 } else { 175 /* Some kinds of TR packet we cannot handle intelligently */ 176 /* XXX - dissect MAC packets if frame type is 0 */ 177 if (!eflag) 178 token_hdr_print(trp, length + TOKEN_HDRLEN + route_len, 179 ESRC(&ehdr), EDST(&ehdr)); 180 if (!suppress_default_print) 181 default_print(p, caplen); 182 } 183 return (hdr_len); 184 } 185 186 /* 187 * This is the top level routine of the printer. 'p' points 188 * to the TR header of the packet, 'h->ts' is the timestamp, 189 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 190 * is the number of bytes actually captured. 191 */ 192 u_int 193 token_if_print(const struct pcap_pkthdr *h, const u_char *p) 194 { 195 return (token_print(p, h->len, h->caplen)); 196 } 197