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 27 #include <sys/cdefs.h> 28 #ifndef lint 29 __RCSID("$NetBSD: print-token.c,v 1.4 2014/11/20 03:05:03 christos Exp $"); 30 #endif 31 32 #define NETDISSECT_REWORKED 33 #ifdef HAVE_CONFIG_H 34 #include "config.h" 35 #endif 36 37 #include <tcpdump-stdinc.h> 38 39 #include <string.h> 40 41 #include "interface.h" 42 #include "extract.h" 43 #include "addrtoname.h" 44 #include "ether.h" 45 46 /* 47 * Copyright (c) 1998, Larry Lile 48 * All rights reserved. 49 * 50 * Redistribution and use in source and binary forms, with or without 51 * modification, are permitted provided that the following conditions 52 * are met: 53 * 1. Redistributions of source code must retain the above copyright 54 * notice unmodified, this list of conditions, and the following 55 * disclaimer. 56 * 2. Redistributions in binary form must reproduce the above copyright 57 * notice, this list of conditions and the following disclaimer in the 58 * documentation and/or other materials provided with the distribution. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 * 72 */ 73 74 #define TOKEN_HDRLEN 14 75 #define TOKEN_RING_MAC_LEN 6 76 #define ROUTING_SEGMENT_MAX 16 77 #define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80) 78 #define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6) 79 #define TOKEN_FC_LLC 1 80 81 #define BROADCAST(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13) 82 #define RIF_LENGTH(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8) 83 #define DIRECTION(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7) 84 #define LARGEST_FRAME(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4) 85 #define RING_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4) 86 #define BRIDGE_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f)) 87 #define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2)) 88 89 struct token_header { 90 uint8_t token_ac; 91 uint8_t token_fc; 92 uint8_t token_dhost[TOKEN_RING_MAC_LEN]; 93 uint8_t token_shost[TOKEN_RING_MAC_LEN]; 94 uint16_t token_rcf; 95 uint16_t token_rseg[ROUTING_SEGMENT_MAX]; 96 }; 97 98 static const char tstr[] = "[|token-ring]"; 99 100 /* Extract src, dst addresses */ 101 static inline void 102 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst) 103 { 104 memcpy(fdst, (const char *)trp->token_dhost, 6); 105 memcpy(fsrc, (const char *)trp->token_shost, 6); 106 } 107 108 /* 109 * Print the TR MAC header 110 */ 111 static inline void 112 token_hdr_print(netdissect_options *ndo, 113 register const struct token_header *trp, register u_int length, 114 register const u_char *fsrc, register const u_char *fdst) 115 { 116 const char *srcname, *dstname; 117 118 srcname = etheraddr_string(ndo, fsrc); 119 dstname = etheraddr_string(ndo, fdst); 120 121 if (ndo->ndo_vflag) 122 ND_PRINT((ndo, "%02x %02x %s %s %d: ", 123 trp->token_ac, 124 trp->token_fc, 125 srcname, dstname, 126 length)); 127 else 128 ND_PRINT((ndo, "%s %s %d: ", srcname, dstname, length)); 129 } 130 131 static const char *broadcast_indicator[] = { 132 "Non-Broadcast", "Non-Broadcast", 133 "Non-Broadcast", "Non-Broadcast", 134 "All-routes", "All-routes", 135 "Single-route", "Single-route" 136 }; 137 138 static const char *direction[] = { 139 "Forward", "Backward" 140 }; 141 142 static const char *largest_frame[] = { 143 "516", 144 "1500", 145 "2052", 146 "4472", 147 "8144", 148 "11407", 149 "17800", 150 "??" 151 }; 152 153 u_int 154 token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 155 { 156 const struct token_header *trp; 157 u_short extracted_ethertype; 158 struct ether_header ehdr; 159 u_int route_len = 0, hdr_len = TOKEN_HDRLEN; 160 int seg; 161 162 trp = (const struct token_header *)p; 163 164 if (caplen < TOKEN_HDRLEN) { 165 ND_PRINT((ndo, "%s", tstr)); 166 return hdr_len; 167 } 168 169 /* 170 * Get the TR addresses into a canonical form 171 */ 172 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr)); 173 174 /* Adjust for source routing information in the MAC header */ 175 if (IS_SOURCE_ROUTED(trp)) { 176 /* Clear source-routed bit */ 177 *ESRC(&ehdr) &= 0x7f; 178 179 if (ndo->ndo_eflag) 180 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr)); 181 182 if (caplen < TOKEN_HDRLEN + 2) { 183 ND_PRINT((ndo, "%s", tstr)); 184 return hdr_len; 185 } 186 route_len = RIF_LENGTH(trp); 187 hdr_len += route_len; 188 if (caplen < hdr_len) { 189 ND_PRINT((ndo, "%s", tstr)); 190 return hdr_len; 191 } 192 if (ndo->ndo_vflag) { 193 ND_PRINT((ndo, "%s ", broadcast_indicator[BROADCAST(trp)])); 194 ND_PRINT((ndo, "%s", direction[DIRECTION(trp)])); 195 196 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 197 ND_PRINT((ndo, " [%d:%d]", RING_NUMBER(trp, seg), 198 BRIDGE_NUMBER(trp, seg))); 199 } else { 200 ND_PRINT((ndo, "rt = %x", EXTRACT_16BITS(&trp->token_rcf))); 201 202 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 203 ND_PRINT((ndo, ":%x", EXTRACT_16BITS(&trp->token_rseg[seg]))); 204 } 205 ND_PRINT((ndo, " (%s) ", largest_frame[LARGEST_FRAME(trp)])); 206 } else { 207 if (ndo->ndo_eflag) 208 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr)); 209 } 210 211 /* Skip over token ring MAC header and routing information */ 212 length -= hdr_len; 213 p += hdr_len; 214 caplen -= hdr_len; 215 216 /* Frame Control field determines interpretation of packet */ 217 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) { 218 /* Try to print the LLC-layer header & higher layers */ 219 if (llc_print(ndo, p, length, caplen, ESRC(&ehdr), EDST(&ehdr), 220 &extracted_ethertype) == 0) { 221 /* ether_type not known, print raw packet */ 222 if (!ndo->ndo_eflag) 223 token_hdr_print(ndo, trp, 224 length + TOKEN_HDRLEN + route_len, 225 ESRC(&ehdr), EDST(&ehdr)); 226 if (extracted_ethertype) { 227 ND_PRINT((ndo, "(LLC %s) ", 228 etherproto_string(htons(extracted_ethertype)))); 229 } 230 if (!ndo->ndo_suppress_default_print) 231 ND_DEFAULTPRINT(p, caplen); 232 } 233 } else { 234 /* Some kinds of TR packet we cannot handle intelligently */ 235 /* XXX - dissect MAC packets if frame type is 0 */ 236 if (!ndo->ndo_eflag) 237 token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len, 238 ESRC(&ehdr), EDST(&ehdr)); 239 if (!ndo->ndo_suppress_default_print) 240 ND_DEFAULTPRINT(p, caplen); 241 } 242 return (hdr_len); 243 } 244 245 /* 246 * This is the top level routine of the printer. 'p' points 247 * to the TR header of the packet, 'h->ts' is the timestamp, 248 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 249 * is the number of bytes actually captured. 250 */ 251 u_int 252 token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 253 { 254 return (token_print(ndo, p, h->len, h->caplen)); 255 } 256