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 #ifndef lint 24 static const char rcsid[] _U_ = 25 "@(#) $Header: /tcpdump/master/tcpdump/print-atm.c,v 1.49 2007-10-22 19:37:51 guy Exp $ (LBL)"; 26 #endif 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include <stdio.h> 35 #include <pcap.h> 36 #include <string.h> 37 38 #include "interface.h" 39 #include "extract.h" 40 #include "addrtoname.h" 41 #include "ethertype.h" 42 #include "atm.h" 43 #include "atmuni31.h" 44 #include "llc.h" 45 46 #include "ether.h" 47 48 #define OAM_CRC10_MASK 0x3ff 49 #define OAM_PAYLOAD_LEN 48 50 #define OAM_FUNCTION_SPECIFIC_LEN 45 /* this excludes crc10 and cell-type/function-type */ 51 #define OAM_CELLTYPE_FUNCTYPE_LEN 1 52 53 struct tok oam_f_values[] = { 54 { VCI_OAMF4SC, "OAM F4 (segment)" }, 55 { VCI_OAMF4EC, "OAM F4 (end)" }, 56 { 0, NULL } 57 }; 58 59 struct tok atm_pty_values[] = { 60 { 0x0, "user data, uncongested, SDU 0" }, 61 { 0x1, "user data, uncongested, SDU 1" }, 62 { 0x2, "user data, congested, SDU 0" }, 63 { 0x3, "user data, congested, SDU 1" }, 64 { 0x4, "VCC OAM F5 flow segment" }, 65 { 0x5, "VCC OAM F5 flow end-to-end" }, 66 { 0x6, "Traffic Control and resource Mgmt" }, 67 { 0, NULL } 68 }; 69 70 #define OAM_CELLTYPE_FM 0x1 71 #define OAM_CELLTYPE_PM 0x2 72 #define OAM_CELLTYPE_AD 0x8 73 #define OAM_CELLTYPE_SM 0xf 74 75 struct tok oam_celltype_values[] = { 76 { OAM_CELLTYPE_FM, "Fault Management" }, 77 { OAM_CELLTYPE_PM, "Performance Management" }, 78 { OAM_CELLTYPE_AD, "activate/deactivate" }, 79 { OAM_CELLTYPE_SM, "System Management" }, 80 { 0, NULL } 81 }; 82 83 #define OAM_FM_FUNCTYPE_AIS 0x0 84 #define OAM_FM_FUNCTYPE_RDI 0x1 85 #define OAM_FM_FUNCTYPE_CONTCHECK 0x4 86 #define OAM_FM_FUNCTYPE_LOOPBACK 0x8 87 88 struct tok oam_fm_functype_values[] = { 89 { OAM_FM_FUNCTYPE_AIS, "AIS" }, 90 { OAM_FM_FUNCTYPE_RDI, "RDI" }, 91 { OAM_FM_FUNCTYPE_CONTCHECK, "Continuity Check" }, 92 { OAM_FM_FUNCTYPE_LOOPBACK, "Loopback" }, 93 { 0, NULL } 94 }; 95 96 struct tok oam_pm_functype_values[] = { 97 { 0x0, "Forward Monitoring" }, 98 { 0x1, "Backward Reporting" }, 99 { 0x2, "Monitoring and Reporting" }, 100 { 0, NULL } 101 }; 102 103 struct tok oam_ad_functype_values[] = { 104 { 0x0, "Performance Monitoring" }, 105 { 0x1, "Continuity Check" }, 106 { 0, NULL } 107 }; 108 109 #define OAM_FM_LOOPBACK_INDICATOR_MASK 0x1 110 111 struct tok oam_fm_loopback_indicator_values[] = { 112 { 0x0, "Reply" }, 113 { 0x1, "Request" }, 114 { 0, NULL } 115 }; 116 117 static const struct tok *oam_functype_values[16] = { 118 NULL, 119 oam_fm_functype_values, /* 1 */ 120 oam_pm_functype_values, /* 2 */ 121 NULL, 122 NULL, 123 NULL, 124 NULL, 125 NULL, 126 oam_ad_functype_values, /* 8 */ 127 NULL, 128 NULL, 129 NULL, 130 NULL, 131 NULL, 132 NULL, 133 NULL 134 }; 135 136 /* 137 * Print an RFC 1483 LLC-encapsulated ATM frame. 138 */ 139 static void 140 atm_llc_print(const u_char *p, int length, int caplen) 141 { 142 u_short extracted_ethertype; 143 144 if (!llc_print(p, length, caplen, NULL, NULL, 145 &extracted_ethertype)) { 146 /* ether_type not known, print raw packet */ 147 if (extracted_ethertype) { 148 printf("(LLC %s) ", 149 etherproto_string(htons(extracted_ethertype))); 150 } 151 if (!suppress_default_print) 152 default_print(p, caplen); 153 } 154 } 155 156 /* 157 * Given a SAP value, generate the LLC header value for a UI packet 158 * with that SAP as the source and destination SAP. 159 */ 160 #define LLC_UI_HDR(sap) ((sap)<<16 | (sap<<8) | 0x03) 161 162 /* 163 * This is the top level routine of the printer. 'p' points 164 * to the LLC/SNAP header of the packet, 'h->ts' is the timestamp, 165 * 'h->len' is the length of the packet off the wire, and 'h->caplen' 166 * is the number of bytes actually captured. 167 */ 168 u_int 169 atm_if_print(const struct pcap_pkthdr *h, const u_char *p) 170 { 171 u_int caplen = h->caplen; 172 u_int length = h->len; 173 u_int32_t llchdr; 174 u_int hdrlen = 0; 175 176 if (caplen < 8) { 177 printf("[|atm]"); 178 return (caplen); 179 } 180 181 /* Cisco Style NLPID ? */ 182 if (*p == LLC_UI) { 183 if (eflag) 184 printf("CNLPID "); 185 isoclns_print(p+1, length-1, caplen-1); 186 return hdrlen; 187 } 188 189 /* 190 * Extract the presumed LLC header into a variable, for quick 191 * testing. 192 * Then check for a header that's neither a header for a SNAP 193 * packet nor an RFC 2684 routed NLPID-formatted PDU nor 194 * an 802.2-but-no-SNAP IP packet. 195 */ 196 llchdr = EXTRACT_24BITS(p); 197 if (llchdr != LLC_UI_HDR(LLCSAP_SNAP) && 198 llchdr != LLC_UI_HDR(LLCSAP_ISONS) && 199 llchdr != LLC_UI_HDR(LLCSAP_IP)) { 200 /* 201 * XXX - assume 802.6 MAC header from Fore driver. 202 * 203 * Unfortunately, the above list doesn't check for 204 * all known SAPs, doesn't check for headers where 205 * the source and destination SAP aren't the same, 206 * and doesn't check for non-UI frames. It also 207 * runs the risk of an 802.6 MAC header that happens 208 * to begin with one of those values being 209 * incorrectly treated as an 802.2 header. 210 * 211 * So is that Fore driver still around? And, if so, 212 * is it still putting 802.6 MAC headers on ATM 213 * packets? If so, could it be changed to use a 214 * new DLT_IEEE802_6 value if we added it? 215 */ 216 if (eflag) 217 printf("%08x%08x %08x%08x ", 218 EXTRACT_32BITS(p), 219 EXTRACT_32BITS(p+4), 220 EXTRACT_32BITS(p+8), 221 EXTRACT_32BITS(p+12)); 222 p += 20; 223 length -= 20; 224 caplen -= 20; 225 hdrlen += 20; 226 } 227 atm_llc_print(p, length, caplen); 228 return (hdrlen); 229 } 230 231 /* 232 * ATM signalling. 233 */ 234 static struct tok msgtype2str[] = { 235 { CALL_PROCEED, "Call_proceeding" }, 236 { CONNECT, "Connect" }, 237 { CONNECT_ACK, "Connect_ack" }, 238 { SETUP, "Setup" }, 239 { RELEASE, "Release" }, 240 { RELEASE_DONE, "Release_complete" }, 241 { RESTART, "Restart" }, 242 { RESTART_ACK, "Restart_ack" }, 243 { STATUS, "Status" }, 244 { STATUS_ENQ, "Status_enquiry" }, 245 { ADD_PARTY, "Add_party" }, 246 { ADD_PARTY_ACK, "Add_party_ack" }, 247 { ADD_PARTY_REJ, "Add_party_reject" }, 248 { DROP_PARTY, "Drop_party" }, 249 { DROP_PARTY_ACK, "Drop_party_ack" }, 250 { 0, NULL } 251 }; 252 253 static void 254 sig_print(const u_char *p, int caplen) 255 { 256 bpf_u_int32 call_ref; 257 258 if (caplen < PROTO_POS) { 259 printf("[|atm]"); 260 return; 261 } 262 if (p[PROTO_POS] == Q2931) { 263 /* 264 * protocol:Q.2931 for User to Network Interface 265 * (UNI 3.1) signalling 266 */ 267 printf("Q.2931"); 268 if (caplen < MSG_TYPE_POS) { 269 printf(" [|atm]"); 270 return; 271 } 272 printf(":%s ", 273 tok2str(msgtype2str, "msgtype#%d", p[MSG_TYPE_POS])); 274 275 /* 276 * The call reference comes before the message type, 277 * so if we know we have the message type, which we 278 * do from the caplen test above, we also know we have 279 * the call reference. 280 */ 281 call_ref = EXTRACT_24BITS(&p[CALL_REF_POS]); 282 printf("CALL_REF:0x%06x", call_ref); 283 } else { 284 /* SCCOP with some unknown protocol atop it */ 285 printf("SSCOP, proto %d ", p[PROTO_POS]); 286 } 287 } 288 289 /* 290 * Print an ATM PDU (such as an AAL5 PDU). 291 */ 292 void 293 atm_print(u_int vpi, u_int vci, u_int traftype, const u_char *p, u_int length, 294 u_int caplen) 295 { 296 if (eflag) 297 printf("VPI:%u VCI:%u ", vpi, vci); 298 299 if (vpi == 0) { 300 switch (vci) { 301 302 case VCI_PPC: 303 sig_print(p, caplen); 304 return; 305 306 case VCI_BCC: 307 printf("broadcast sig: "); 308 return; 309 310 case VCI_OAMF4SC: /* fall through */ 311 case VCI_OAMF4EC: 312 oam_print(p, length, ATM_OAM_HEC); 313 return; 314 315 case VCI_METAC: 316 printf("meta: "); 317 return; 318 319 case VCI_ILMIC: 320 printf("ilmi: "); 321 snmp_print(p, length); 322 return; 323 } 324 } 325 326 switch (traftype) { 327 328 case ATM_LLC: 329 default: 330 /* 331 * Assumes traffic is LLC if unknown. 332 */ 333 atm_llc_print(p, length, caplen); 334 break; 335 336 case ATM_LANE: 337 lane_print(p, length, caplen); 338 break; 339 } 340 } 341 342 struct oam_fm_loopback_t { 343 u_int8_t loopback_indicator; 344 u_int8_t correlation_tag[4]; 345 u_int8_t loopback_id[12]; 346 u_int8_t source_id[12]; 347 u_int8_t unused[16]; 348 }; 349 350 struct oam_fm_ais_rdi_t { 351 u_int8_t failure_type; 352 u_int8_t failure_location[16]; 353 u_int8_t unused[28]; 354 }; 355 356 int 357 oam_print (const u_char *p, u_int length, u_int hec) { 358 359 u_int32_t cell_header; 360 u_int16_t vpi, vci, cksum, cksum_shouldbe, idx; 361 u_int8_t cell_type, func_type, payload, clp; 362 363 union { 364 const struct oam_fm_loopback_t *oam_fm_loopback; 365 const struct oam_fm_ais_rdi_t *oam_fm_ais_rdi; 366 } oam_ptr; 367 368 369 cell_header = EXTRACT_32BITS(p+hec); 370 cell_type = ((*(p+ATM_HDR_LEN_NOHEC+hec))>>4) & 0x0f; 371 func_type = (*(p+ATM_HDR_LEN_NOHEC+hec)) & 0x0f; 372 373 vpi = (cell_header>>20)&0xff; 374 vci = (cell_header>>4)&0xffff; 375 payload = (cell_header>>1)&0x7; 376 clp = cell_header&0x1; 377 378 printf("%s, vpi %u, vci %u, payload [ %s ], clp %u, length %u", 379 tok2str(oam_f_values, "OAM F5", vci), 380 vpi, vci, 381 tok2str(atm_pty_values, "Unknown", payload), 382 clp, length); 383 384 if (!vflag) { 385 return 1; 386 } 387 388 printf("\n\tcell-type %s (%u)", 389 tok2str(oam_celltype_values, "unknown", cell_type), 390 cell_type); 391 392 if (oam_functype_values[cell_type] == NULL) 393 printf(", func-type unknown (%u)", func_type); 394 else 395 printf(", func-type %s (%u)", 396 tok2str(oam_functype_values[cell_type],"none",func_type), 397 func_type); 398 399 p += ATM_HDR_LEN_NOHEC + hec; 400 401 switch (cell_type << 4 | func_type) { 402 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_LOOPBACK): 403 oam_ptr.oam_fm_loopback = (const struct oam_fm_loopback_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); 404 printf("\n\tLoopback-Indicator %s, Correlation-Tag 0x%08x", 405 tok2str(oam_fm_loopback_indicator_values, 406 "Unknown", 407 oam_ptr.oam_fm_loopback->loopback_indicator & OAM_FM_LOOPBACK_INDICATOR_MASK), 408 EXTRACT_32BITS(&oam_ptr.oam_fm_loopback->correlation_tag)); 409 printf("\n\tLocation-ID "); 410 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->loopback_id); idx++) { 411 if (idx % 2) { 412 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->loopback_id[idx])); 413 } 414 } 415 printf("\n\tSource-ID "); 416 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_loopback->source_id); idx++) { 417 if (idx % 2) { 418 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_loopback->source_id[idx])); 419 } 420 } 421 break; 422 423 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_AIS): 424 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_RDI): 425 oam_ptr.oam_fm_ais_rdi = (const struct oam_fm_ais_rdi_t *)(p + OAM_CELLTYPE_FUNCTYPE_LEN); 426 printf("\n\tFailure-type 0x%02x", oam_ptr.oam_fm_ais_rdi->failure_type); 427 printf("\n\tLocation-ID "); 428 for (idx = 0; idx < sizeof(oam_ptr.oam_fm_ais_rdi->failure_location); idx++) { 429 if (idx % 2) { 430 printf("%04x ", EXTRACT_16BITS(&oam_ptr.oam_fm_ais_rdi->failure_location[idx])); 431 } 432 } 433 break; 434 435 case (OAM_CELLTYPE_FM << 4 | OAM_FM_FUNCTYPE_CONTCHECK): 436 /* FIXME */ 437 break; 438 439 default: 440 break; 441 } 442 443 /* crc10 checksum verification */ 444 cksum = EXTRACT_16BITS(p + OAM_CELLTYPE_FUNCTYPE_LEN + OAM_FUNCTION_SPECIFIC_LEN) 445 & OAM_CRC10_MASK; 446 cksum_shouldbe = verify_crc10_cksum(0, p, OAM_PAYLOAD_LEN); 447 448 printf("\n\tcksum 0x%03x (%scorrect)", 449 cksum, 450 cksum_shouldbe == 0 ? "" : "in"); 451 452 return 1; 453 } 454