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 22 #include <sys/cdefs.h> 23 #ifndef lint 24 __RCSID("$NetBSD: print-atm.c,v 1.6 2015/03/31 21:59:35 christos Exp $"); 25 #endif 26 27 #define NETDISSECT_REWORKED 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include "interface.h" 35 #include "extract.h" 36 #include "addrtoname.h" 37 #include "atm.h" 38 #include "atmuni31.h" 39 #include "llc.h" 40 41 static const char tstr[] = "[|atm]"; 42 43 #define OAM_CRC10_MASK 0x3ff 44 #define OAM_PAYLOAD_LEN 48 45 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */ 46 #define OAM_CELLTYPE_FUNCTYPE_LEN 1 47 48 static const struct tok oam_f_values[] = { 49 { VCI_OAMF4SC, "OAM F4 (segment)" }, 50 { VCI_OAMF4EC, "OAM F4 (end)" }, 51 { 0, NULL } 52 }; 53 54 static const struct tok atm_pty_values[] = { 55 { 0x0, "user data, uncongested, SDU 0" }, 56 { 0x1, "user data, uncongested, SDU 1" }, 57 { 0x2, "user data, congested, SDU 0" }, 58 { 0x3, "user data, congested, SDU 1" }, 59 { 0x4, "VCC OAM F5 flow segment" }, 60 { 0x5, "VCC OAM F5 flow end-to-end" }, 61 { 0x6, "Traffic Control and resource Mgmt" }, 62 { 0, NULL } 63 }; 64 65 #define OAM_CELLTYPE_FM 0x1 66 #define OAM_CELLTYPE_PM 0x2 67 #define OAM_CELLTYPE_AD 0x8 68 #define OAM_CELLTYPE_SM 0xf 69 70 static const struct tok oam_celltype_values[] = { 71 { OAM_CELLTYPE_FM, "Fault Management" }, 72 { OAM_CELLTYPE_PM, "Performance Management" }, 73 { OAM_CELLTYPE_AD, "activate/deactivate" }, 74 { OAM_CELLTYPE_SM, "System Management" }, 75 { 0, NULL } 76 }; 77 78 #define OAM_FM_FUNCTYPE_AIS 0x0 79 #define OAM_FM_FUNCTYPE_RDI 0x1 80 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4 81 #define OAM_FM_FUNCTYPE_LOOPBACK 0x8 82 83 static const struct tok oam_fm_functype_values[] = { 84 { OAM_FM_FUNCTYPE_AIS, "AIS" }, 85 { OAM_FM_FUNCTYPE_RDI, "RDI" }, 86 { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" }, 87 { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" }, 88 { 0, NULL } 89 }; 90 91 static const struct tok oam_pm_functype_values[] = { 92 { 0x0, "Forward Monitoring" }, 93 { 0x1, "Backward Reporting" }, 94 { 0x2, "Monitoring and Reporting" }, 95 { 0, NULL } 96 }; 97 98 static const struct tok oam_ad_functype_values[] = { 99 { 0x0, "Performance Monitoring" }, 100 { 0x1, "Continuity Check" }, 101 { 0, NULL } 102 }; 103 104 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1 105 106 static const struct tok oam_fm_loopback_indicator_values[] = { 107 { 0x0, "Reply" }, 108 { 0x1, "Request" }, 109 { 0, NULL } 110 }; 111 112 static const struct tok *oam_functype_values[16] = { 113 NULL, 114 oam_fm_functype_values, /* 1 */ 115 oam_pm_functype_values, /* 2 */ 116 NULL, 117 NULL, 118 NULL, 119 NULL, 120 NULL, 121 oam_ad_functype_values, /* 8 */ 122 NULL, 123 NULL, 124 NULL, 125 NULL, 126 NULL, 127 NULL, 128 NULL 129 }; 130 131 /* 132 * Print an RFC 1483 LLC-encapsulated ATM frame. 133 */ 134 static void 135 atm_llc_print(netdissect_options *ndo, 136 const u_char *p, int length, int caplen) 137 { 138 u_short extracted_ethertype; 139 140 if (!llc_print(ndo, p, length, caplen, NULL, NULL, 141 &extracted_ethertype)) { 142 /* ether_type not known, print raw packet */ 143 if (extracted_ethertype) { 144 ND_PRINT((ndo, "(LLC %s) ", 145 etherproto_string(htons(extracted_ethertype)))); 146 } 147 if (!ndo->ndo_suppress_default_print) 148 ND_DEFAULTPRINT(p, caplen); 149 } 150 } 151 152 /* 153 * Given a SAP value, generate the LLC header value for a UI packet 154 * with that SAP as the source and destination SAP. 155 */ 156 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03) 157 158 /* 159 * This is the top level routine of the printer. 'p' points 160 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp, 161 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 162 * is the number of bytes actually captured. 163 */ 164 u_int 165 atm_if_print(netdissect_options *ndo, 166 const struct pcap_pkthdr *h, const u_char *p) 167 { 168 u_int caplen = h->caplen; 169 u_int length = h->len; 170 uint32_t llchdr; 171 u_int hdrlen = 0; 172 173 if (caplen < 1 || length < 1) { 174 ND_PRINT((ndo, "%s", tstr)); 175 return (caplen); 176 } 177 178 /* Cisco Style NLPID ? */ 179 if (*p == LLC_UI) { 180 if (ndo->ndo_eflag) 181 ND_PRINT((ndo, "CNLPID ")); 182 isoclns_print(ndo, p + 1, length - 1, caplen - 1); 183 return hdrlen; 184 } 185 186 /* 187 * Must have at least a DSAP, an SSAP, and the first byte of the 188 * control field. 189 */ 190 if (caplen < 3 || length < 3) { 191 ND_PRINT((ndo, "%s", tstr)); 192 return (caplen); 193 } 194 195 /* 196 * Extract the presumed LLC header into a variable, for quick 197 * testing. 198 * Then check for a header that's neither a header for a SNAP 199 * packet nor an RFC 2684 routed NLPID-formatted PDU nor 200 * an 802.2-but-no-SNAP IP packet. 201 */ 202 llchdr = EXTRACT_24BITS(p); 203 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) && 204 llchdr != LLC_UI_HDR(LLCSAP_ISONS) && 205 llchdr != LLC_UI_HDR(LLCSAP_IP)) { 206 /* 207 * XXX - assume 802.6 MAC header from Fore driver. 208 * 209 * Unfortunately, the above list doesn't check for 210 * all known SAPs, doesn't check for headers where 211 * the source and destination SAP aren't the same, 212 * and doesn't check for non-UI frames. It also 213 * runs the risk of an 802.6 MAC header that happens 214 * to begin with one of those values being 215 * incorrectly treated as an 802.2 header. 216 * 217 * So is that Fore driver still around? And, if so, 218 * is it still putting 802.6 MAC headers on ATM 219 * packets? If so, could it be changed to use a 220 * new DLT_IEEE802_6 value if we added it? 221 */ 222 if (caplen < 20 || length < 20) { 223 ND_PRINT((ndo, "%s", tstr)); 224 return (caplen); 225 } 226 if (ndo->ndo_eflag) 227 ND_PRINT((ndo, "%08x%08x %08x%08x ", 228 EXTRACT_32BITS(p), 229 EXTRACT_32BITS(p+4), 230 EXTRACT_32BITS(p+8), 231 EXTRACT_32BITS(p+12))); 232 p += 20; 233 length -= 20; 234 caplen -= 20; 235 hdrlen += 20; 236 } 237 atm_llc_print(ndo, p, length, caplen); 238 return (hdrlen); 239 } 240 241 /* 242 * ATM signalling. 243 */ 244 static const struct tok msgtype2str[] = { 245 { CALL_PROCEED, "Call_proceeding" }, 246 { CONNECT, "Connect" }, 247 { CONNECT_ACK, "Connect_ack" }, 248 { SETUP, "Setup" }, 249 { RELEASE, "Release" }, 250 { RELEASE_DONE, "Release_complete" }, 251 { RESTART, "Restart" }, 252 { RESTART_ACK, "Restart_ack" }, 253 { STATUS, "Status" }, 254 { STATUS_ENQ, "Status_enquiry" }, 255 { ADD_PARTY, "Add_party" }, 256 { ADD_PARTY_ACK, "Add_party_ack" }, 257 { ADD_PARTY_REJ, "Add_party_reject" }, 258 { DROP_PARTY, "Drop_party" }, 259 { DROP_PARTY_ACK, "Drop_party_ack" }, 260 { 0, NULL } 261 }; 262 263 static void 264 sig_print(netdissect_options *ndo, 265 const u_char *p, int caplen) 266 { 267 uint32_t call_ref; 268 269 if (caplen < PROTO_POS) { 270 ND_PRINT((ndo, "%s", tstr)); 271 return; 272 } 273 if (p[PROTO_POS] == Q2931) { 274 /* 275 * protocol:Q.2931 for User to Network Interface 276 * (UNI 3.1) signalling 277 */ 278 ND_PRINT((ndo, "Q.2931")); 279 if (caplen < MSG_TYPE_POS) { 280 ND_PRINT((ndo, " %s", tstr)); 281 return; 282 } 283 ND_PRINT((ndo, ":%s ", 284 tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS]))); 285 286 /* 287 * The call reference comes before the message type, 288 * so if we know we have the message type, which we 289 * do from the caplen test above, we also know we have 290 * the call reference. 291 */ 292 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]); 293 ND_PRINT((ndo, "CALL_REF:0x%06x", call_ref)); 294 } else { 295 /* SCCOP with some unknown protocol atop it */ 296 ND_PRINT((ndo, "SSCOP, proto %d ", p[PROTO_POS])); 297 } 298 } 299 300 /* 301 * Print an ATM PDU (such as an AAL5 PDU). 302 */ 303 void 304 atm_print(netdissect_options *ndo, 305 u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, 306 u_int caplen) 307 { 308 if (ndo->ndo_eflag) 309 ND_PRINT((ndo, "VPI:%u VCI:%u ", vpi, vci)); 310 311 if (vpi == 0) { 312 switch (vci) { 313 314 case VCI_PPC: 315 sig_print(ndo, p, caplen); 316 return; 317 318 case VCI_BCC: 319 ND_PRINT((ndo, "broadcast sig: ")); 320 return; 321 322 case VCI_OAMF4SC: /* fall through */ 323 case VCI_OAMF4EC: 324 oam_print(ndo, p, length, ATM_OAM_HEC); 325 return; 326 327 case VCI_METAC: 328 ND_PRINT((ndo, "meta: ")); 329 return; 330 331 case VCI_ILMIC: 332 ND_PRINT((ndo, "ilmi: ")); 333 snmp_print(ndo, p, length); 334 return; 335 } 336 } 337 338 switch (traftype) { 339 340 case ATM_LLC: 341 default: 342 /* 343 * Assumes traffic is LLC if unknown. 344 */ 345 atm_llc_print(ndo, p, length, caplen); 346 break; 347 348 case ATM_LANE: 349 lane_print(ndo, p, length, caplen); 350 break; 351 } 352 } 353 354 struct oam_fm_loopback_t { 355 uint8_t loopback_indicator; 356 uint8_t correlation_tag[4]; 357 uint8_t loopback_id[12]; 358 uint8_t source_id[12]; 359 uint8_t unused[16]; 360 }; 361 362 struct oam_fm_ais_rdi_t { 363 uint8_t failure_type; 364 uint8_t failure_location[16]; 365 uint8_t unused[28]; 366 }; 367 368 int 369 oam_print (netdissect_options *ndo, 370 const u_char *p, u_int length, u_int hec) 371 { 372 uint32_t cell_header; 373 uint16_t vpi, vci, cksum, cksum_shouldbe, idx; 374 uint8_t cell_type, func_type, payload, clp; 375 376 union { 377 const struct oam_fm_loopback_t *oam_fm_loopback; 378 const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi; 379 } oam_ptr; 380 381 382 cell_header = EXTRACT_32BITS(p+hec); 383 cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f; 384 func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f; 385 386 vpi = (cell_header>>20)&0xff; 387 vci = (cell_header>>4)&0xffff; 388 payload = (cell_header>>1)&0x7; 389 clp = cell_header&0x1; 390 391 ND_PRINT((ndo, "%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u", 392 tok2str(oam_f_values, "OAM F5", vci), 393 vpi, vci, 394 tok2str(atm_pty_values, "Unknown", payload), 395 clp, length)); 396 397 if (!ndo->ndo_vflag) { 398 return 1; 399 } 400 401 ND_PRINT((ndo, "\n\tcell-type %s (%u)", 402 tok2str(oam_celltype_values, "unknown", cell_type), 403 cell_type)); 404 405 if (oam_functype_values[cell_type] == NULL) 406 ND_PRINT((ndo, ", func-type unknown (%u)", func_type)); 407 else 408 ND_PRINT((ndo, ", func-type %s (%u)", 409 tok2str(oam_functype_values[cell_type],"none",func_type), 410 func_type)); 411 412 p += ATM_HDR_LEN_NOHEC + hec; 413 414 switch (cell_type << 4 | func_type) { 415 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK): 416 oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); 417 ND_PRINT((ndo, "\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x", 418 tok2str(oam_fm_loopback_indicator_values, 419 "Unknown", 420 oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK), 421 EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag))); 422 ND_PRINT((ndo, "\n\tLocation-ID ")); 423 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) { 424 if (idx % 2) { 425 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx]))); 426 } 427 } 428 ND_PRINT((ndo, "\n\tSource-ID ")); 429 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) { 430 if (idx % 2) { 431 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx]))); 432 } 433 } 434 break; 435 436 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS): 437 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI): 438 oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); 439 ND_PRINT((ndo, "\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type)); 440 ND_PRINT((ndo, "\n\tLocation-ID ")); 441 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) { 442 if (idx % 2) { 443 ND_PRINT((ndo, "%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx]))); 444 } 445 } 446 break; 447 448 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK): 449 /* FIXME */ 450 break; 451 452 default: 453 break; 454 } 455 456 /* crc10 checksum verification */ 457 cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN) 458 & OAM_CRC10_MASK; 459 cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN); 460 461 ND_PRINT((ndo, "\n\tcksum 0x%03x (%scorrect)", 462 cksum, 463 cksum_shouldbe == 0 ? "" : "in")); 464 465 return 1; 466 } 467