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 /* \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 #include "ether.h" 41 42 /* 43 * Copyright (c) 1998, Larry Lile 44 * All rights reserved. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice unmodified, this list of conditions, and the following 51 * disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 * 68 */ 69 70 #define TOKEN_HDRLEN 14 71 #define TOKEN_RING_MAC_LEN 6 72 #define ROUTING_SEGMENT_MAX 16 73 #define IS_SOURCE_ROUTED(trp) ((trp)->token_shost[0] & 0x80) 74 #define FRAME_TYPE(trp) (((trp)->token_fc & 0xC0) >> 6) 75 #define TOKEN_FC_LLC 1 76 77 #define BROADCAST(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0xE000) >> 13) 78 #define RIF_LENGTH(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x1f00) >> 8) 79 #define DIRECTION(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0080) >> 7) 80 #define LARGEST_FRAME(trp) ((EXTRACT_16BITS(&(trp)->token_rcf) & 0x0070) >> 4) 81 #define RING_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0xfff0) >> 4) 82 #define BRIDGE_NUMBER(trp, x) ((EXTRACT_16BITS(&(trp)->token_rseg[x]) & 0x000f)) 83 #define SEGMENT_COUNT(trp) ((int)((RIF_LENGTH(trp) - 2) / 2)) 84 85 struct token_header { 86 uint8_t token_ac; 87 uint8_t token_fc; 88 uint8_t token_dhost[TOKEN_RING_MAC_LEN]; 89 uint8_t token_shost[TOKEN_RING_MAC_LEN]; 90 uint16_t token_rcf; 91 uint16_t token_rseg[ROUTING_SEGMENT_MAX]; 92 }; 93 94 static const char tstr[] = "[|token-ring]"; 95 96 /* Extract src, dst addresses */ 97 static inline 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 inline void 108 token_hdr_print(netdissect_options *ndo, 109 register const struct token_header *trp, register u_int length, 110 register const u_char *fsrc, register 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((ndo, "%02x %02x ", 119 trp->token_ac, 120 trp->token_fc)); 121 ND_PRINT((ndo, "%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 struct ether_header ehdr; 154 struct lladdr_info src, dst; 155 u_int route_len = 0, hdr_len = TOKEN_HDRLEN; 156 int seg; 157 158 trp = (const struct token_header *)p; 159 160 if (caplen < TOKEN_HDRLEN) { 161 ND_PRINT((ndo, "%s", tstr)); 162 return hdr_len; 163 } 164 165 /* 166 * Get the TR addresses into a canonical form 167 */ 168 extract_token_addrs(trp, (char*)ESRC(&ehdr), (char*)EDST(&ehdr)); 169 170 /* Adjust for source routing information in the MAC header */ 171 if (IS_SOURCE_ROUTED(trp)) { 172 /* Clear source-routed bit */ 173 *ESRC(&ehdr) &= 0x7f; 174 175 if (ndo->ndo_eflag) 176 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr)); 177 178 if (caplen < TOKEN_HDRLEN + 2) { 179 ND_PRINT((ndo, "%s", tstr)); 180 return hdr_len; 181 } 182 route_len = RIF_LENGTH(trp); 183 hdr_len += route_len; 184 if (caplen < hdr_len) { 185 ND_PRINT((ndo, "%s", tstr)); 186 return hdr_len; 187 } 188 if (ndo->ndo_vflag) { 189 ND_PRINT((ndo, "%s ", broadcast_indicator[BROADCAST(trp)])); 190 ND_PRINT((ndo, "%s", direction[DIRECTION(trp)])); 191 192 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 193 ND_PRINT((ndo, " [%d:%d]", RING_NUMBER(trp, seg), 194 BRIDGE_NUMBER(trp, seg))); 195 } else { 196 ND_PRINT((ndo, "rt = %x", EXTRACT_16BITS(&trp->token_rcf))); 197 198 for (seg = 0; seg < SEGMENT_COUNT(trp); seg++) 199 ND_PRINT((ndo, ":%x", EXTRACT_16BITS(&trp->token_rseg[seg]))); 200 } 201 ND_PRINT((ndo, " (%s) ", largest_frame[LARGEST_FRAME(trp)])); 202 } else { 203 if (ndo->ndo_eflag) 204 token_hdr_print(ndo, trp, length, ESRC(&ehdr), EDST(&ehdr)); 205 } 206 207 src.addr = ESRC(&ehdr); 208 src.addr_string = etheraddr_string; 209 dst.addr = EDST(&ehdr); 210 dst.addr_string = etheraddr_string; 211 212 /* Skip over token ring MAC header and routing information */ 213 length -= hdr_len; 214 p += hdr_len; 215 caplen -= hdr_len; 216 217 /* Frame Control field determines interpretation of packet */ 218 if (FRAME_TYPE(trp) == TOKEN_FC_LLC) { 219 /* Try to print the LLC-layer header & higher layers */ 220 llc_hdrlen = llc_print(ndo, p, length, caplen, &src, &dst); 221 if (llc_hdrlen < 0) { 222 /* packet type not known, print raw packet */ 223 if (!ndo->ndo_suppress_default_print) 224 ND_DEFAULTPRINT(p, caplen); 225 llc_hdrlen = -llc_hdrlen; 226 } 227 hdr_len += llc_hdrlen; 228 } else { 229 /* Some kinds of TR packet we cannot handle intelligently */ 230 /* XXX - dissect MAC packets if frame type is 0 */ 231 if (!ndo->ndo_eflag) 232 token_hdr_print(ndo, trp, length + TOKEN_HDRLEN + route_len, 233 ESRC(&ehdr), EDST(&ehdr)); 234 if (!ndo->ndo_suppress_default_print) 235 ND_DEFAULTPRINT(p, caplen); 236 } 237 return (hdr_len); 238 } 239 240 /* 241 * This is the top level routine of the printer. 'p' points 242 * to the TR header of the packet, 'h->ts' is the timestamp, 243 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 244 * is the number of bytes actually captured. 245 */ 246 u_int 247 token_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p) 248 { 249 return (token_print(ndo, p, h->len, h->caplen)); 250 } 251
