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 /* \summary: Token Ring printer */ 28 29 #ifdef HAVE_CONFIG_H 30 #include <config.h> 31 #endif 32 33 #include "netdissect-stdinc.h" 34 35 #include <string.h> 36 37 #include "netdissect.h" 38 #include "extract.h" 39 #include "addrtoname.h" 40 41 /* 42 * Copyright (c) 1998, Larry Lile 43 * All rights reserved. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice unmodified, this list of conditions, and the following 50 * disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 */ 68 69 #define TOKEN_HDRLEN 14 70 #define ROUTING_SEGMENT_MAX 16 71 #define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80) 72 #define FRAME_TYPE(trp) ((GET_U_1((trp)->token_fc) & 0xC0) >> 6) 73 #define TOKEN_FC_LLC 1 74 75 #define BROADCAST(trp) ((GET_BE_U_2((trp)->token_rcf) & 0xE000) >> 13) 76 #define RIF_LENGTH(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x1f00) >> 8) 77 #define DIRECTION(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x0080) >> 7) 78 #define LARGEST_FRAME(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x0070) >> 4) 79 #define RING_NUMBER(trp, x) ((GET_BE_U_2((trp)->token_rseg[x]) & 0xfff0) >> 4) 80 #define BRIDGE_NUMBER(trp, x) (GET_BE_U_2((trp)->token_rseg[x]) & 0x000f) 81 #define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2)) 82 83 struct token_header { 84 nd_uint8_t token_ac; 85 nd_uint8_t token_fc; 86 nd_mac_addr token_dhost; 87 nd_mac_addr token_shost; 88 nd_uint16_t token_rcf; 89 nd_uint16_t token_rseg[ROUTING_SEGMENT_MAX]; 90 }; 91 92 93 /* Extract src, dst addresses */ 94 static void 95 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst) 96 { 97 memcpy(fdst, (const char *)trp->token_dhost, 6); 98 memcpy(fsrc, (const char *)trp->token_shost, 6); 99 } 100 101 /* 102 * Print the TR MAC header 103 */ 104 static void 105 token_hdr_print(netdissect_options *ndo, 106 const struct token_header *trp, u_int length, 107 const u_char *fsrc, const u_char *fdst) 108 { 109 const char *srcname, *dstname; 110 111 srcname = etheraddr_string(ndo, fsrc); 112 dstname = etheraddr_string(ndo, fdst); 113 114 if (!ndo->ndo_qflag) 115 ND_PRINT("%02x %02x ", 116 GET_U_1(trp->token_ac), 117 GET_U_1(trp->token_fc)); 118 ND_PRINT("%s > %s, length %u: ", 119 srcname, dstname, 120 length); 121 } 122 123 static const char *broadcast_indicator[] = { 124 "Non-Broadcast", "Non-Broadcast", 125 "Non-Broadcast", "Non-Broadcast", 126 "All-routes", "All-routes", 127 "Single-route", "Single-route" 128 }; 129 130 static const char *direction[] = { 131 "Forward", "Backward" 132 }; 133 134 static const char *largest_frame[] = { 135 "516", 136 "1500", 137 "2052", 138 "4472", 139 "8144", 140 "11407", 141 "17800", 142 "??" 143 }; 144 145 u_int 146 token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 147 { 148 const struct token_header *trp; 149 int llc_hdrlen; 150 nd_mac_addr srcmac, dstmac; 151 struct lladdr_info src, dst; 152 u_int route_len = 0, hdr_len = TOKEN_HDRLEN; 153 int seg; 154 155 ndo->ndo_protocol = "token-ring"; 156 trp = (const struct token_header *)p; 157 158 if (caplen < TOKEN_HDRLEN) { 159 nd_print_trunc(ndo); 160 return hdr_len; 161 } 162 163 /* 164 * Get the TR addresses into a canonical form 165 */ 166 extract_token_addrs(trp, (char*)srcmac, (char*)dstmac); 167 168 /* Adjust for source routing information in the MAC header */ 169 if (IS_SOURCE_ROUTED(trp)) { 170 /* Clear source-routed bit */ 171 srcmac[0] &= 0x7f; 172 173 if (ndo->ndo_eflag) 174 token_hdr_print(ndo, trp, length, srcmac, dstmac); 175 176 if (caplen < TOKEN_HDRLEN + 2) { 177 nd_print_trunc(ndo); 178 return hdr_len; 179 } 180 route_len = RIF_LENGTH(trp); 181 hdr_len += route_len; 182 if (caplen < hdr_len) { 183 nd_print_trunc(ndo); 184 return hdr_len; 185 } 186 if (ndo->ndo_vflag) { 187 ND_PRINT("%s ", broadcast_indicator[BROADCAST(trp)]); 188 ND_PRINT("%s", direction[DIRECTION(trp)]); 189 190 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 191 ND_PRINT(" [%u:%u]", RING_NUMBER(trp, seg), 192 BRIDGE_NUMBER(trp, seg)); 193 } else { 194 ND_PRINT("rt = %x", GET_BE_U_2(trp->token_rcf)); 195 196 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 197 ND_PRINT(":%x", 198 GET_BE_U_2(trp->token_rseg[seg])); 199 } 200 ND_PRINT(" (%s) ", largest_frame[LARGEST_FRAME(trp)]); 201 } else { 202 if (ndo->ndo_eflag) 203 token_hdr_print(ndo, trp, length, srcmac, dstmac); 204 } 205 206 src.addr = srcmac; 207 src.addr_string = etheraddr_string; 208 dst.addr = dstmac; 209 dst.addr_string = etheraddr_string; 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 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); 220 if (llc_hdrlen < 0) { 221 /* packet type not known, print raw packet */ 222 if (!ndo->ndo_suppress_default_print) 223 ND_DEFAULTPRINT(p, caplen); 224 llc_hdrlen = -llc_hdrlen; 225 } 226 hdr_len += llc_hdrlen; 227 } else { 228 /* Some kinds of TR packet we cannot handle intelligently */ 229 /* XXX - dissect MAC packets if frame type is 0 */ 230 if (!ndo->ndo_eflag) 231 token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len, 232 srcmac, dstmac); 233 if (!ndo->ndo_suppress_default_print) 234 ND_DEFAULTPRINT(p, caplen); 235 } 236 return (hdr_len); 237 } 238 239 /* 240 * This is the top level routine of the printer. 'p' points 241 * to the TR header of the packet, 'h->ts' is the timestamp, 242 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 243 * is the number of bytes actually captured. 244 */ 245 void 246 token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 247 { 248 ndo->ndo_protocol = "token-ring"; 249 ndo->ndo_ll_hdr_len += token_print(ndo, p, h->len, h->caplen); 250 } 251