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 (at) stdio.com> 22 * 23 * Further tweaked to more closely resemble print-fddi.c 24 * Guy Harris <guy (at) alum.mit.edu> 25 */ 26 27 #include <sys/cdefs.h> 28 #ifndef lint 29 __RCSID("$NetBSD: print-token.c,v 1.8 2024/09/02 16:15:33 christos Exp $"); 30 #endif 31 32 /* \summary: Token Ring printer */ 33 34 #include <config.h> 35 36 #include "netdissect-stdinc.h" 37 38 #include <string.h> 39 40 #include "netdissect.h" 41 #include "extract.h" 42 #include "addrtoname.h" 43 44 /* 45 * Copyright (c) 1998, Larry Lile 46 * All rights reserved. 47 * 48 * Redistribution and use in source and binary forms, with or without 49 * modification, are permitted provided that the following conditions 50 * are met: 51 * 1. Redistributions of source code must retain the above copyright 52 * notice unmodified, this list of conditions, and the following 53 * disclaimer. 54 * 2. Redistributions in binary form must reproduce the above copyright 55 * notice, this list of conditions and the following disclaimer in the 56 * documentation and/or other materials provided with the distribution. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 */ 71 72 #define TOKEN_HDRLEN 14 73 #define ROUTING_SEGMENT_MAX 16 74 #define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80) 75 #define FRAME_TYPE(trp) ((GET_U_1((trp)->token_fc) & 0xC0) >> 6) 76 #define TOKEN_FC_LLC 1 77 78 #define BROADCAST(trp) ((GET_BE_U_2((trp)->token_rcf) & 0xE000) >> 13) 79 #define RIF_LENGTH(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x1f00) >> 8) 80 #define DIRECTION(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x0080) >> 7) 81 #define LARGEST_FRAME(trp) ((GET_BE_U_2((trp)->token_rcf) & 0x0070) >> 4) 82 #define RING_NUMBER(trp, x) ((GET_BE_U_2((trp)->token_rseg[x]) & 0xfff0) >> 4) 83 #define BRIDGE_NUMBER(trp, x) (GET_BE_U_2((trp)->token_rseg[x]) & 0x000f) 84 #define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2)) 85 86 struct token_header { 87 nd_uint8_t token_ac; 88 nd_uint8_t token_fc; 89 nd_mac_addr token_dhost; 90 nd_mac_addr token_shost; 91 nd_uint16_t token_rcf; 92 nd_uint16_t token_rseg[ROUTING_SEGMENT_MAX]; 93 }; 94 95 96 /* Extract src, dst addresses */ 97 static void 98 extract_token_addrs(const struct token_header *trp, char *fsrc, char *fdst) 99 { 100 memcpy(fdst, (const char *)trp->token_dhost, 6); 101 memcpy(fsrc, (const char *)trp->token_shost, 6); 102 } 103 104 /* 105 * Print the TR MAC header 106 */ 107 static void 108 token_hdr_print(netdissect_options *ndo, 109 const struct token_header *trp, u_int length, 110 const u_char *fsrc, const u_char *fdst) 111 { 112 const char *srcname, *dstname; 113 114 srcname = etheraddr_string(ndo, fsrc); 115 dstname = etheraddr_string(ndo, fdst); 116 117 if (!ndo->ndo_qflag) 118 ND_PRINT("%02x %02x ", 119 GET_U_1(trp->token_ac), 120 GET_U_1(trp->token_fc)); 121 ND_PRINT("%s > %s, length %u: ", 122 srcname, dstname, 123 length); 124 } 125 126 static const char *broadcast_indicator[] = { 127 "Non-Broadcast", "Non-Broadcast", 128 "Non-Broadcast", "Non-Broadcast", 129 "All-routes", "All-routes", 130 "Single-route", "Single-route" 131 }; 132 133 static const char *direction[] = { 134 "Forward", "Backward" 135 }; 136 137 static const char *largest_frame[] = { 138 "516", 139 "1500", 140 "2052", 141 "4472", 142 "8144", 143 "11407", 144 "17800", 145 "??" 146 }; 147 148 u_int 149 token_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen) 150 { 151 const struct token_header *trp; 152 int llc_hdrlen; 153 nd_mac_addr srcmac, dstmac; 154 struct lladdr_info src, dst; 155 u_int route_len = 0, hdr_len = TOKEN_HDRLEN; 156 int seg; 157 158 ndo->ndo_protocol = "token-ring"; 159 trp = (const struct token_header *)p; 160 161 if (caplen < TOKEN_HDRLEN) { 162 nd_print_trunc(ndo); 163 return hdr_len; 164 } 165 166 /* 167 * Get the TR addresses into a canonical form 168 */ 169 extract_token_addrs(trp, (char*)srcmac, (char*)dstmac); 170 171 /* Adjust for source routing information in the MAC header */ 172 if (IS_SOURCE_ROUTED(trp)) { 173 /* Clear source-routed bit */ 174 srcmac[0] &= 0x7f; 175 176 if (ndo->ndo_eflag) 177 token_hdr_print(ndo, trp, length, srcmac, dstmac); 178 179 if (caplen < TOKEN_HDRLEN + 2) { 180 nd_print_trunc(ndo); 181 return hdr_len; 182 } 183 route_len = RIF_LENGTH(trp); 184 hdr_len += route_len; 185 if (caplen < hdr_len) { 186 nd_print_trunc(ndo); 187 return hdr_len; 188 } 189 if (ndo->ndo_vflag) { 190 ND_PRINT("%s ", broadcast_indicator[BROADCAST(trp)]); 191 ND_PRINT("%s", direction[DIRECTION(trp)]); 192 193 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 194 ND_PRINT(" [%u:%u]", RING_NUMBER(trp, seg), 195 BRIDGE_NUMBER(trp, seg)); 196 } else { 197 ND_PRINT("rt = %x", GET_BE_U_2(trp->token_rcf)); 198 199 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 200 ND_PRINT(":%x", 201 GET_BE_U_2(trp->token_rseg[seg])); 202 } 203 ND_PRINT(" (%s) ", largest_frame[LARGEST_FRAME(trp)]); 204 } else { 205 if (ndo->ndo_eflag) 206 token_hdr_print(ndo, trp, length, srcmac, dstmac); 207 } 208 209 src.addr = srcmac; 210 src.addr_string = etheraddr_string; 211 dst.addr = dstmac; 212 dst.addr_string = etheraddr_string; 213 214 /* Skip over token ring MAC header and routing information */ 215 length -= hdr_len; 216 p += hdr_len; 217 caplen -= hdr_len; 218 219 /* Frame Control field determines interpretation of packet */ 220 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) { 221 /* Try to print the LLC-layer header & higher layers */ 222 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); 223 if (llc_hdrlen < 0) { 224 /* packet type not known, print raw packet */ 225 if (!ndo->ndo_suppress_default_print) 226 ND_DEFAULTPRINT(p, caplen); 227 llc_hdrlen = -llc_hdrlen; 228 } 229 hdr_len += llc_hdrlen; 230 } else { 231 /* Some kinds of TR packet we cannot handle intelligently */ 232 /* XXX - dissect MAC packets if frame type is 0 */ 233 if (!ndo->ndo_eflag) 234 token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len, 235 srcmac, dstmac); 236 if (!ndo->ndo_suppress_default_print) 237 ND_DEFAULTPRINT(p, caplen); 238 } 239 return (hdr_len); 240 } 241 242 /* 243 * This is the top level routine of the printer. 'p' points 244 * to the TR header of the packet, 'h->ts' is the timestamp, 245 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 246 * is the number of bytes actually captured. 247 */ 248 void 249 token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 250 { 251 ndo->ndo_protocol = "token-ring"; 252 ndo->ndo_ll_hdr_len += token_print(ndo, p, h->len, h->caplen); 253 } 254
Indexes created Tue Feb 24 08:35:24 UTC 2026