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 #ifndef lint 22 static const char rcsid[] _U_ = 23 "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.49 2007-10-22 19:37:51 guy Exp $ (LBL)"; 24 #endif 25 26 #ifdef HAVE_CONFIG_H 27 #include "config.h" 28 #endif 29 30 #include <tcpdump-stdinc.h> 31 32 #include <stdio.h> 33 #include <pcap.h> 34 #include <string.h> 35 36 #include "interface.h" 37 #include "extract.h" 38 #include "addrtoname.h" 39 #include "ethertype.h" 40 #include "atm.h" 41 #include "atmuni31.h" 42 #include "llc.h" 43 44 #include "ether.h" 45 46 #define OAM_CRC10_MASK 0x3ff 47 #define OAM_PAYLOAD_LEN 48 48 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */ 49 #define OAM_CELLTYPE_FUNCTYPE_LEN 1 50 51 struct tok oam_f_values[] = { 52 { VCI_OAMF4SC, "OAM F4 (segment)" }, 53 { VCI_OAMF4EC, "OAM F4 (end)" }, 54 { 0, NULL } 55 }; 56 57 struct tok atm_pty_values[] = { 58 { 0x0, "user data, uncongested, SDU 0" }, 59 { 0x1, "user data, uncongested, SDU 1" }, 60 { 0x2, "user data, congested, SDU 0" }, 61 { 0x3, "user data, congested, SDU 1" }, 62 { 0x4, "VCC OAM F5 flow segment" }, 63 { 0x5, "VCC OAM F5 flow end-to-end" }, 64 { 0x6, "Traffic Control and resource Mgmt" }, 65 { 0, NULL } 66 }; 67 68 #define OAM_CELLTYPE_FM 0x1 69 #define OAM_CELLTYPE_PM 0x2 70 #define OAM_CELLTYPE_AD 0x8 71 #define OAM_CELLTYPE_SM 0xf 72 73 struct tok oam_celltype_values[] = { 74 { OAM_CELLTYPE_FM, "Fault Management" }, 75 { OAM_CELLTYPE_PM, "Performance Management" }, 76 { OAM_CELLTYPE_AD, "activate/deactivate" }, 77 { OAM_CELLTYPE_SM, "System Management" }, 78 { 0, NULL } 79 }; 80 81 #define OAM_FM_FUNCTYPE_AIS 0x0 82 #define OAM_FM_FUNCTYPE_RDI 0x1 83 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4 84 #define OAM_FM_FUNCTYPE_LOOPBACK 0x8 85 86 struct tok oam_fm_functype_values[] = { 87 { OAM_FM_FUNCTYPE_AIS, "AIS" }, 88 { OAM_FM_FUNCTYPE_RDI, "RDI" }, 89 { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" }, 90 { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" }, 91 { 0, NULL } 92 }; 93 94 struct tok oam_pm_functype_values[] = { 95 { 0x0, "Forward Monitoring" }, 96 { 0x1, "Backward Reporting" }, 97 { 0x2, "Monitoring and Reporting" }, 98 { 0, NULL } 99 }; 100 101 struct tok oam_ad_functype_values[] = { 102 { 0x0, "Performance Monitoring" }, 103 { 0x1, "Continuity Check" }, 104 { 0, NULL } 105 }; 106 107 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1 108 109 struct tok oam_fm_loopback_indicator_values[] = { 110 { 0x0, "Reply" }, 111 { 0x1, "Request" }, 112 { 0, NULL } 113 }; 114 115 static const struct tok *oam_functype_values[16] = { 116 NULL, 117 oam_fm_functype_values, /* 1 */ 118 oam_pm_functype_values, /* 2 */ 119 NULL, 120 NULL, 121 NULL, 122 NULL, 123 NULL, 124 oam_ad_functype_values, /* 8 */ 125 NULL, 126 NULL, 127 NULL, 128 NULL, 129 NULL, 130 NULL, 131 NULL 132 }; 133 134 /* 135 * Print an RFC 1483 LLC-encapsulated ATM frame. 136 */ 137 static void 138 atm_llc_print(const u_char *p, int length, int caplen) 139 { 140 u_short extracted_ethertype; 141 142 if (!llc_print(p, length, caplen, NULL, NULL, 143 &extracted_ethertype)) { 144 /* ether_type not known, print raw packet */ 145 if (extracted_ethertype) { 146 printf("(LLC %s) ", 147 etherproto_string(htons(extracted_ethertype))); 148 } 149 if (!suppress_default_print) 150 default_print(p, caplen); 151 } 152 } 153 154 /* 155 * Given a SAP value, generate the LLC header value for a UI packet 156 * with that SAP as the source and destination SAP. 157 */ 158 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03) 159 160 /* 161 * This is the top level routine of the printer. 'p' points 162 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp, 163 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 164 * is the number of bytes actually captured. 165 */ 166 u_int 167 atm_if_print(const struct pcap_pkthdr *h, const u_char *p) 168 { 169 u_int caplen = h->caplen; 170 u_int length = h->len; 171 u_int32_t llchdr; 172 u_int hdrlen = 0; 173 174 if (caplen < 8) { 175 printf("[|atm]"); 176 return (caplen); 177 } 178 179 /* Cisco Style NLPID ? */ 180 if (*p == LLC_UI) { 181 if (eflag) 182 printf("CNLPID "); 183 isoclns_print(p+1, length-1, caplen-1); 184 return hdrlen; 185 } 186 187 /* 188 * Extract the presumed LLC header into a variable, for quick 189 * testing. 190 * Then check for a header that's neither a header for a SNAP 191 * packet nor an RFC 2684 routed NLPID-formatted PDU nor 192 * an 802.2-but-no-SNAP IP packet. 193 */ 194 llchdr = EXTRACT_24BITS(p); 195 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) && 196 llchdr != LLC_UI_HDR(LLCSAP_ISONS) && 197 llchdr != LLC_UI_HDR(LLCSAP_IP)) { 198 /* 199 * XXX - assume 802.6 MAC header from Fore driver. 200 * 201 * Unfortunately, the above list doesn't check for 202 * all known SAPs, doesn't check for headers where 203 * the source and destination SAP aren't the same, 204 * and doesn't check for non-UI frames. It also 205 * runs the risk of an 802.6 MAC header that happens 206 * to begin with one of those values being 207 * incorrectly treated as an 802.2 header. 208 * 209 * So is that Fore driver still around? And, if so, 210 * is it still putting 802.6 MAC headers on ATM 211 * packets? If so, could it be changed to use a 212 * new DLT_IEEE802_6 value if we added it? 213 */ 214 if (eflag) 215 printf("%08x%08x %08x%08x ", 216 EXTRACT_32BITS(p), 217 EXTRACT_32BITS(p+4), 218 EXTRACT_32BITS(p+8), 219 EXTRACT_32BITS(p+12)); 220 p += 20; 221 length -= 20; 222 caplen -= 20; 223 hdrlen += 20; 224 } 225 atm_llc_print(p, length, caplen); 226 return (hdrlen); 227 } 228 229 /* 230 * ATM signalling. 231 */ 232 static struct tok msgtype2str[] = { 233 { CALL_PROCEED, "Call_proceeding" }, 234 { CONNECT, "Connect" }, 235 { CONNECT_ACK, "Connect_ack" }, 236 { SETUP, "Setup" }, 237 { RELEASE, "Release" }, 238 { RELEASE_DONE, "Release_complete" }, 239 { RESTART, "Restart" }, 240 { RESTART_ACK, "Restart_ack" }, 241 { STATUS, "Status" }, 242 { STATUS_ENQ, "Status_enquiry" }, 243 { ADD_PARTY, "Add_party" }, 244 { ADD_PARTY_ACK, "Add_party_ack" }, 245 { ADD_PARTY_REJ, "Add_party_reject" }, 246 { DROP_PARTY, "Drop_party" }, 247 { DROP_PARTY_ACK, "Drop_party_ack" }, 248 { 0, NULL } 249 }; 250 251 static void 252 sig_print(const u_char *p, int caplen) 253 { 254 bpf_u_int32 call_ref; 255 256 if (caplen < PROTO_POS) { 257 printf("[|atm]"); 258 return; 259 } 260 if (p[PROTO_POS] == Q2931) { 261 /* 262 * protocol:Q.2931 for User to Network Interface 263 * (UNI 3.1) signalling 264 */ 265 printf("Q.2931"); 266 if (caplen < MSG_TYPE_POS) { 267 printf(" [|atm]"); 268 return; 269 } 270 printf(":%s ", 271 tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])); 272 273 /* 274 * The call reference comes before the message type, 275 * so if we know we have the message type, which we 276 * do from the caplen test above, we also know we have 277 * the call reference. 278 */ 279 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]); 280 printf("CALL_REF:0x%06x", call_ref); 281 } else { 282 /* SCCOP with some unknown protocol atop it */ 283 printf("SSCOP, proto %d ", p[PROTO_POS]); 284 } 285 } 286 287 /* 288 * Print an ATM PDU (such as an AAL5 PDU). 289 */ 290 void 291 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, 292 u_int caplen) 293 { 294 if (eflag) 295 printf("VPI:%u VCI:%u ", vpi, vci); 296 297 if (vpi == 0) { 298 switch (vci) { 299 300 case VCI_PPC: 301 sig_print(p, caplen); 302 return; 303 304 case VCI_BCC: 305 printf("broadcast sig: "); 306 return; 307 308 case VCI_OAMF4SC: /* fall through */ 309 case VCI_OAMF4EC: 310 oam_print(p, length, ATM_OAM_HEC); 311 return; 312 313 case VCI_METAC: 314 printf("meta: "); 315 return; 316 317 case VCI_ILMIC: 318 printf("ilmi: "); 319 snmp_print(p, length); 320 return; 321 } 322 } 323 324 switch (traftype) { 325 326 case ATM_LLC: 327 default: 328 /* 329 * Assumes traffic is LLC if unknown. 330 */ 331 atm_llc_print(p, length, caplen); 332 break; 333 334 case ATM_LANE: 335 lane_print(p, length, caplen); 336 break; 337 } 338 } 339 340 struct oam_fm_loopback_t { 341 u_int8_t loopback_indicator; 342 u_int8_t correlation_tag[4]; 343 u_int8_t loopback_id[12]; 344 u_int8_t source_id[12]; 345 u_int8_t unused[16]; 346 }; 347 348 struct oam_fm_ais_rdi_t { 349 u_int8_t failure_type; 350 u_int8_t failure_location[16]; 351 u_int8_t unused[28]; 352 }; 353 354 int 355 oam_print (const u_char *p, u_int length, u_int hec) { 356 357 u_int32_t cell_header; 358 u_int16_t vpi, vci, cksum, cksum_shouldbe, idx; 359 u_int8_t cell_type, func_type, payload, clp; 360 361 union { 362 const struct oam_fm_loopback_t *oam_fm_loopback; 363 const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi; 364 } oam_ptr; 365 366 367 cell_header = EXTRACT_32BITS(p+hec); 368 cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f; 369 func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f; 370 371 vpi = (cell_header>>20)&0xff; 372 vci = (cell_header>>4)&0xffff; 373 payload = (cell_header>>1)&0x7; 374 clp = cell_header&0x1; 375 376 printf("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u", 377 tok2str(oam_f_values, "OAM F5", vci), 378 vpi, vci, 379 tok2str(atm_pty_values, "Unknown", payload), 380 clp, length); 381 382 if (!vflag) { 383 return 1; 384 } 385 386 printf("\n\tcell-type %s (%u)", 387 tok2str(oam_celltype_values, "unknown", cell_type), 388 cell_type); 389 390 if (oam_functype_values[cell_type] == NULL) 391 printf(", func-type unknown (%u)", func_type); 392 else 393 printf(", func-type %s (%u)", 394 tok2str(oam_functype_values[cell_type],"none",func_type), 395 func_type); 396 397 p += ATM_HDR_LEN_NOHEC + hec; 398 399 switch (cell_type << 4 | func_type) { 400 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK): 401 oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); 402 printf("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x", 403 tok2str(oam_fm_loopback_indicator_values, 404 "Unknown", 405 oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK), 406 EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag)); 407 printf("\n\tLocation-ID "); 408 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) { 409 if (idx % 2) { 410 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx])); 411 } 412 } 413 printf("\n\tSource-ID "); 414 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) { 415 if (idx % 2) { 416 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx])); 417 } 418 } 419 break; 420 421 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS): 422 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI): 423 oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); 424 printf("\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type); 425 printf("\n\tLocation-ID "); 426 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) { 427 if (idx % 2) { 428 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx])); 429 } 430 } 431 break; 432 433 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK): 434 /* FIXME */ 435 break; 436 437 default: 438 break; 439 } 440 441 /* crc10 checksum verification */ 442 cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN) 443 & OAM_CRC10_MASK; 444 cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN); 445 446 printf("\n\tcksum 0x%03x (%scorrect)", 447 cksum, 448 cksum_shouldbe == 0 ? "" : "in"); 449 450 return 1; 451 } 452