1 /* 2 * Copyright (c) 1994, 1995, 1996, 1997 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 * $FreeBSD$ 22 */ 23 24 #define NETDISSECT_REWORKED 25 #ifdef HAVE_CONFIG_H 26 #include "config.h" 27 #endif 28 29 #include <tcpdump-stdinc.h> 30 31 #include "interface.h" 32 #include "extract.h" 33 #include "addrtoname.h" 34 #include "atm.h" 35 #include "atmuni31.h" 36 #include "llc.h" 37 38 static const char tstr[] = "[|atm]"; 39 40 #define OAM_CRC10_MASK 0x3ff 41 #define OAM_PAYLOAD_LEN 48 42 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */ 43 #define OAM_CELLTYPE_FUNCTYPE_LEN 1 44 45 static const struct tok oam_f_values[] = { 46 { VCI_OAMF4SC, "OAM F4 (segment)" }, 47 { VCI_OAMF4EC, "OAM F4 (end)" }, 48 { 0, NULL } 49 }; 50 51 static const struct tok atm_pty_values[] = { 52 { 0x0, "user data, uncongested, SDU 0" }, 53 { 0x1, "user data, uncongested, SDU 1" }, 54 { 0x2, "user data, congested, SDU 0" }, 55 { 0x3, "user data, congested, SDU 1" }, 56 { 0x4, "VCC OAM F5 flow segment" }, 57 { 0x5, "VCC OAM F5 flow end-to-end" }, 58 { 0x6, "Traffic Control and resource Mgmt" }, 59 { 0, NULL } 60 }; 61 62 #define OAM_CELLTYPE_FM 0x1 63 #define OAM_CELLTYPE_PM 0x2 64 #define OAM_CELLTYPE_AD 0x8 65 #define OAM_CELLTYPE_SM 0xf 66 67 static const struct tok oam_celltype_values[] = { 68 { OAM_CELLTYPE_FM, "Fault Management" }, 69 { OAM_CELLTYPE_PM, "Performance Management" }, 70 { OAM_CELLTYPE_AD, "activate/deactivate" }, 71 { OAM_CELLTYPE_SM, "System Management" }, 72 { 0, NULL } 73 }; 74 75 #define OAM_FM_FUNCTYPE_AIS 0x0 76 #define OAM_FM_FUNCTYPE_RDI 0x1 77 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4 78 #define OAM_FM_FUNCTYPE_LOOPBACK 0x8 79 80 static const struct tok oam_fm_functype_values[] = { 81 { OAM_FM_FUNCTYPE_AIS, "AIS" }, 82 { OAM_FM_FUNCTYPE_RDI, "RDI" }, 83 { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" }, 84 { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" }, 85 { 0, NULL } 86 }; 87 88 static const struct tok oam_pm_functype_values[] = { 89 { 0x0, "Forward Monitoring" }, 90 { 0x1, "Backward Reporting" }, 91 { 0x2, "Monitoring and Reporting" }, 92 { 0, NULL } 93 }; 94 95 static const struct tok oam_ad_functype_values[] = { 96 { 0x0, "Performance Monitoring" }, 97 { 0x1, "Continuity Check" }, 98 { 0, NULL } 99 }; 100 101 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1 102 103 static const struct tok oam_fm_loopback_indicator_values[] = { 104 { 0x0, "Reply" }, 105 { 0x1, "Request" }, 106 { 0, NULL } 107 }; 108 109 static const struct tok *oam_functype_values[16] = { 110 NULL, 111 oam_fm_functype_values, /* 1 */ 112 oam_pm_functype_values, /* 2 */ 113 NULL, 114 NULL, 115 NULL, 116 NULL, 117 NULL, 118 oam_ad_functype_values, /* 8 */ 119 NULL, 120 NULL, 121 NULL, 122 NULL, 123 NULL, 124 NULL, 125 NULL 126 }; 127 128 /* 129 * Print an RFC 1483 LLC-encapsulated ATM frame. 130 */ 131 static void 132 atm_llc_print(netdissect_options *ndo, 133 const u_char *p, int length, int caplen) 134 { 135 u_short extracted_ethertype; 136 137 if (!llc_print(ndo, p, length, caplen, NULL, NULL, 138 &extracted_ethertype)) { 139 /* ether_type not known, print raw packet */ 140 if (extracted_ethertype) { 141 ND_PRINT((ndo, "(LLC %s) ", 142 etherproto_string(htons(extracted_ethertype)))); 143 } 144 if (!ndo->ndo_suppress_default_print) 145 ND_DEFAULTPRINT(p, caplen); 146 } 147 } 148 149 /* 150 * Given a SAP value, generate the LLC header value for a UI packet 151 * with that SAP as the source and destination SAP. 152 */ 153 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03) 154 155 /* 156 * This is the top level routine of the printer. 'p' points 157 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp, 158 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 159 * is the number of bytes actually captured. 160 */ 161 u_int 162 atm_if_print(netdissect_options *ndo, 163 const struct pcap_pkthdr *h, const u_char *p) 164 { 165 u_int caplen = h->caplen; 166 u_int length = h->len; 167 uint32_t llchdr; 168 u_int hdrlen = 0; 169 170 if (caplen < 1 || length < 1) { 171 ND_PRINT((ndo, "%s", tstr)); 172 return (caplen); 173 } 174 175 /* Cisco Style NLPID ? */ 176 if (*p == LLC_UI) { 177 if (ndo->ndo_eflag) 178 ND_PRINT((ndo, "CNLPID ")); 179 isoclns_print(ndo, p + 1, length - 1, caplen - 1); 180 return hdrlen; 181 } 182 183 /* 184 * Must have at least a DSAP, an SSAP, and the first byte of the 185 * control field. 186 */ 187 if (caplen < 3 || length < 3) { 188 ND_PRINT((ndo, "%s", tstr)); 189 return (caplen); 190 } 191 192 /* 193 * Extract the presumed LLC header into a variable, for quick 194 * testing. 195 * Then check for a header that's neither a header for a SNAP 196 * packet nor an RFC 2684 routed NLPID-formatted PDU nor 197 * an 802.2-but-no-SNAP IP packet. 198 */ 199 llchdr = EXTRACT_24BITS(p); 200 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) && 201 llchdr != LLC_UI_HDR(LLCSAP_ISONS) && 202 llchdr != LLC_UI_HDR(LLCSAP_IP)) { 203 /* 204 * XXX - assume 802.6 MAC header from Fore driver. 205 * 206 * Unfortunately, the above list doesn't check for 207 * all known SAPs, doesn't check for headers where 208 * the source and destination SAP aren't the same, 209 * and doesn't check for non-UI frames. It also 210 * runs the risk of an 802.6 MAC header that happens 211 * to begin with one of those values being 212 * incorrectly treated as an 802.2 header. 213 * 214 * So is that Fore driver still around? And, if so, 215 * is it still putting 802.6 MAC headers on ATM 216 * packets? If so, could it be changed to use a 217 * new DLT_IEEE802_6 value if we added it? 218 */ 219 if (caplen < 20 || length < 20) { 220 ND_PRINT((ndo, "%s", tstr)); 221 return (caplen); 222 } 223 if (ndo->ndo_eflag) 224 ND_PRINT((ndo, "%08x%08x %08x%08x ", 225 EXTRACT_32BITS(p), 226 EXTRACT_32BITS(p+4), 227 EXTRACT_32BITS(p+8), 228 EXTRACT_32BITS(p+12))); 229 p += 20; 230 length -= 20; 231 caplen -= 20; 232 hdrlen += 20; 233 } 234 atm_llc_print(ndo, p, length, caplen); 235 return (hdrlen); 236 } 237 238 /* 239 * ATM signalling. 240 */ 241 static const struct tok msgtype2str[] = { 242 { CALL_PROCEED, "Call_proceeding" }, 243 { CONNECT, "Connect" }, 244 { CONNECT_ACK, "Connect_ack" }, 245 { SETUP, "Setup" }, 246 { RELEASE, "Release" }, 247 { RELEASE_DONE, "Release_complete" }, 248 { RESTART, "Restart" }, 249 { RESTART_ACK, "Restart_ack" }, 250 { STATUS, "Status" }, 251 { STATUS_ENQ, "Status_enquiry" }, 252 { ADD_PARTY, "Add_party" }, 253 { ADD_PARTY_ACK, "Add_party_ack" }, 254 { ADD_PARTY_REJ, "Add_party_reject" }, 255 { DROP_PARTY, "Drop_party" }, 256 { DROP_PARTY_ACK, "Drop_party_ack" }, 257 { 0, NULL } 258 }; 259 260 static void 261 sig_print(netdissect_options *ndo, 262 const u_char *p, int caplen) 263 { 264 uint32_t call_ref; 265 266 if (caplen < PROTO_POS) { 267 ND_PRINT((ndo, "%s", tstr)); 268 return; 269 } 270 if (p[PROTO_POS] == Q2931) { 271 /* 272 * protocol:Q.2931 for User to Network Interface 273 * (UNI 3.1) signalling 274 */ 275 ND_PRINT((ndo, "Q.2931")); 276 if (caplen < MSG_TYPE_POS) { 277 ND_PRINT((ndo, " %s", tstr)); 278 return; 279 } 280 ND_PRINT((ndo, ":%s ", 281 tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]))); 282 283 /* 284 * The call reference comes before the message type, 285 * so if we know we have the message type, which we 286 * do from the caplen test above, we also know we have 287 * the call reference. 288 */ 289 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]); 290 ND_PRINT((ndo, "CALL_REF:0x%06x", call_ref)); 291 } else { 292 /* SCCOP with some unknown protocol atop it */ 293 ND_PRINT((ndo, "SSCOP, proto %d ", p[PROTO_POS])); 294 } 295 } 296 297 /* 298 * Print an ATM PDU (such as an AAL5 PDU). 299 */ 300 void 301 atm_print(netdissect_options *ndo, 302 u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, 303 u_int caplen) 304 { 305 if (ndo->ndo_eflag) 306 ND_PRINT((ndo, "VPI:%u VCI:%u ", vpi, vci)); 307 308 if (vpi == 0) { 309 switch (vci) { 310 311 case VCI_PPC: 312 sig_print(ndo, p, caplen); 313 return; 314 315 case VCI_BCC: 316 ND_PRINT((ndo, "broadcast sig: ")); 317 return; 318 319 case VCI_OAMF4SC: /* fall through */ 320 case VCI_OAMF4EC: 321 oam_print(ndo, p, length, ATM_OAM_HEC); 322 return; 323 324 case VCI_METAC: 325 ND_PRINT((ndo, "meta: ")); 326 return; 327 328 case VCI_ILMIC: 329 ND_PRINT((ndo, "ilmi: ")); 330 snmp_print(ndo, p, length); 331 return; 332 } 333 } 334 335 switch (traftype) { 336 337 case ATM_LLC: 338 default: 339 /* 340 * Assumes traffic is LLC if unknown. 341 */ 342 atm_llc_print(ndo, p, length, caplen); 343 break; 344 345 case ATM_LANE: 346 lane_print(ndo, p, length, caplen); 347 break; 348 } 349 } 350 351 struct oam_fm_loopback_t { 352 uint8_t loopback_indicator; 353 uint8_t correlation_tag[4]; 354 uint8_t loopback_id[12]; 355 uint8_t source_id[12]; 356 uint8_t unused[16]; 357 }; 358 359 struct oam_fm_ais_rdi_t { 360 uint8_t failure_type; 361 uint8_t failure_location[16]; 362 uint8_t unused[28]; 363 }; 364 365 int 366 oam_print (netdissect_options *ndo, 367 const u_char *p, u_int length, u_int hec) 368 { 369 uint32_t cell_header; 370 uint16_t vpi, vci, cksum, cksum_shouldbe, idx; 371 uint8_t cell_type, func_type, payload, clp; 372 373 union { 374 const struct oam_fm_loopback_t *oam_fm_loopback; 375 const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi; 376 } oam_ptr; 377 378 379 cell_header = EXTRACT_32BITS(p+hec); 380 cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f; 381 func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f; 382 383 vpi = (cell_header>>20)&0xff; 384 vci = (cell_header>>4)&0xffff; 385 payload = (cell_header>>1)&0x7; 386 clp = cell_header&0x1; 387 388 ND_PRINT((ndo, "%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u", 389 tok2str(oam_f_values, "OAM F5", vci), 390 vpi, vci, 391 tok2str(atm_pty_values, "Unknown", payload), 392 clp, length)); 393 394 if (!ndo->ndo_vflag) { 395 return 1; 396 } 397 398 ND_PRINT((ndo, "\n\tcell-type %s (%u)", 399 tok2str(oam_celltype_values, "unknown", cell_type), 400 cell_type)); 401 402 if (oam_functype_values[cell_type] == NULL) 403 ND_PRINT((ndo, ", func-type unknown (%u)", func_type)); 404 else 405 ND_PRINT((ndo, ", func-type %s (%u)", 406 tok2str(oam_functype_values[cell_type],"none",func_type), 407 func_type)); 408 409 p += ATM_HDR_LEN_NOHEC + hec; 410 411 switch (cell_type << 4 | func_type) { 412 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK): 413 oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); 414 ND_PRINT((ndo, "\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x", 415 tok2str(oam_fm_loopback_indicator_values, 416 "Unknown", 417 oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK), 418 EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag))); 419 ND_PRINT((ndo, "\n\tLocation-ID ")); 420 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) { 421 if (idx % 2) { 422 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx]))); 423 } 424 } 425 ND_PRINT((ndo, "\n\tSource-ID ")); 426 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) { 427 if (idx % 2) { 428 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx]))); 429 } 430 } 431 break; 432 433 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS): 434 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI): 435 oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); 436 ND_PRINT((ndo, "\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type)); 437 ND_PRINT((ndo, "\n\tLocation-ID ")); 438 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) { 439 if (idx % 2) { 440 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx]))); 441 } 442 } 443 break; 444 445 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK): 446 /* FIXME */ 447 break; 448 449 default: 450 break; 451 } 452 453 /* crc10 checksum verification */ 454 cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN) 455 & OAM_CRC10_MASK; 456 cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN); 457 458 ND_PRINT((ndo, "\n\tcksum 0x%03x (%scorrect)", 459 cksum, 460 cksum_shouldbe == 0 ? "" : "in")); 461 462 return 1; 463 } 464