| 1 | /* |
| 2 | * Copyright (c) 1990, 1991, 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 | |
| 22 | /* \summary: Frame Relay printer */ |
| 23 | |
| 24 | #ifdef HAVE_CONFIG_H |
| 25 | #include <config.h> |
| 26 | #endif |
| 27 | |
| 28 | #include "netdissect-stdinc.h" |
| 29 | |
| 30 | #include <stdio.h> |
| 31 | #include <string.h> |
| 32 | |
| 33 | #include "netdissect.h" |
| 34 | #include "addrtoname.h" |
| 35 | #include "ethertype.h" |
| 36 | #include "llc.h" |
| 37 | #include "nlpid.h" |
| 38 | #include "extract.h" |
| 39 | |
| 40 | static void frf15_print(netdissect_options *ndo, const u_char *, u_int); |
| 41 | |
| 42 | /* |
| 43 | * the frame relay header has a variable length |
| 44 | * |
| 45 | * the EA bit determines if there is another byte |
| 46 | * in the header |
| 47 | * |
| 48 | * minimum header length is 2 bytes |
| 49 | * maximum header length is 4 bytes |
| 50 | * |
| 51 | * 7 6 5 4 3 2 1 0 |
| 52 | * +----+----+----+----+----+----+----+----+ |
| 53 | * | DLCI (6 bits) | CR | EA | |
| 54 | * +----+----+----+----+----+----+----+----+ |
| 55 | * | DLCI (4 bits) |FECN|BECN| DE | EA | |
| 56 | * +----+----+----+----+----+----+----+----+ |
| 57 | * | DLCI (7 bits) | EA | |
| 58 | * +----+----+----+----+----+----+----+----+ |
| 59 | * | DLCI (6 bits) |SDLC| EA | |
| 60 | * +----+----+----+----+----+----+----+----+ |
| 61 | */ |
| 62 | |
| 63 | #define FR_EA_BIT 0x01 |
| 64 | |
| 65 | #define FR_CR_BIT 0x02000000 |
| 66 | #define FR_DE_BIT 0x00020000 |
| 67 | #define FR_BECN_BIT 0x00040000 |
| 68 | #define FR_FECN_BIT 0x00080000 |
| 69 | #define FR_SDLC_BIT 0x00000002 |
| 70 | |
| 71 | |
| 72 | static const struct tok fr_header_flag_values[] = { |
| 73 | { FR_CR_BIT, "C!" }, |
| 74 | { FR_DE_BIT, "DE" }, |
| 75 | { FR_BECN_BIT, "BECN" }, |
| 76 | { FR_FECN_BIT, "FECN" }, |
| 77 | { FR_SDLC_BIT, "sdlcore" }, |
| 78 | { 0, NULL } |
| 79 | }; |
| 80 | |
| 81 | /* FRF.15 / FRF.16 */ |
| 82 | #define MFR_B_BIT 0x80 |
| 83 | #define MFR_E_BIT 0x40 |
| 84 | #define MFR_C_BIT 0x20 |
| 85 | #define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) |
| 86 | #define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) |
| 87 | #define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT ) |
| 88 | |
| 89 | static const struct tok frf_flag_values[] = { |
| 90 | { MFR_B_BIT, "Begin" }, |
| 91 | { MFR_E_BIT, "End" }, |
| 92 | { MFR_C_BIT, "Control" }, |
| 93 | { 0, NULL } |
| 94 | }; |
| 95 | |
| 96 | /* Finds out Q.922 address length, DLCI and flags. Returns 1 on success, |
| 97 | * 0 on invalid address, -1 on truncated packet |
| 98 | * save the flags dep. on address length |
| 99 | */ |
| 100 | static int parse_q922_header(netdissect_options *ndo, |
| 101 | const u_char *p, u_int *dlci, |
| 102 | u_int *addr_len, uint32_t *flags, u_int length) |
| 103 | { |
| 104 | if (!ND_TTEST_1(p) || length < 1) |
| 105 | return -1; |
| 106 | if ((GET_U_1(p) & FR_EA_BIT)) |
| 107 | return 0; |
| 108 | |
| 109 | if (!ND_TTEST_1(p + 1) || length < 2) |
| 110 | return -1; |
| 111 | *addr_len = 2; |
| 112 | *dlci = ((GET_U_1(p) & 0xFC) << 2) | ((GET_U_1(p + 1) & 0xF0) >> 4); |
| 113 | |
| 114 | *flags = ((GET_U_1(p) & 0x02) << 24) | /* CR flag */ |
| 115 | ((GET_U_1(p + 1) & 0x0e) << 16); /* FECN,BECN,DE flags */ |
| 116 | |
| 117 | if (GET_U_1(p + 1) & FR_EA_BIT) |
| 118 | return 1; /* 2-byte Q.922 address */ |
| 119 | |
| 120 | p += 2; |
| 121 | length -= 2; |
| 122 | if (!ND_TTEST_1(p) || length < 1) |
| 123 | return -1; |
| 124 | (*addr_len)++; /* 3- or 4-byte Q.922 address */ |
| 125 | if ((GET_U_1(p) & FR_EA_BIT) == 0) { |
| 126 | *dlci = (*dlci << 7) | (GET_U_1(p) >> 1); |
| 127 | (*addr_len)++; /* 4-byte Q.922 address */ |
| 128 | p++; |
| 129 | length--; |
| 130 | } |
| 131 | |
| 132 | if (!ND_TTEST_1(p) || length < 1) |
| 133 | return -1; |
| 134 | if ((GET_U_1(p) & FR_EA_BIT) == 0) |
| 135 | return 0; /* more than 4 bytes of Q.922 address? */ |
| 136 | |
| 137 | *flags = *flags | (GET_U_1(p) & 0x02); /* SDLC flag */ |
| 138 | |
| 139 | *dlci = (*dlci << 6) | (GET_U_1(p) >> 2); |
| 140 | |
| 141 | return 1; |
| 142 | } |
| 143 | |
| 144 | const char * |
| 145 | q922_string(netdissect_options *ndo, const u_char *p, u_int length) |
| 146 | { |
| 147 | |
| 148 | static u_int dlci, addr_len; |
| 149 | static uint32_t flags; |
| 150 | static char buffer[sizeof("parse_q922_header() returned XXXXXXXXXXX")]; |
| 151 | int ret; |
| 152 | memset(buffer, 0, sizeof(buffer)); |
| 153 | |
| 154 | ret = parse_q922_header(ndo, p, &dlci, &addr_len, &flags, length); |
| 155 | if (ret == 1) { |
| 156 | snprintf(buffer, sizeof(buffer), "DLCI %u", dlci); |
| 157 | return buffer; |
| 158 | } else if (ret == 0) { |
| 159 | return "<Invalid DLCI>"; |
| 160 | } else if (ret == -1) { |
| 161 | return "<Truncated>"; |
| 162 | } else { |
| 163 | snprintf(buffer, sizeof(buffer), "parse_q922_header() returned %d", ret); |
| 164 | return buffer; |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | |
| 169 | /* Frame Relay packet structure, with flags and CRC removed |
| 170 | |
| 171 | +---------------------------+ |
| 172 | | Q.922 Address* | |
| 173 | +-- --+ |
| 174 | | | |
| 175 | +---------------------------+ |
| 176 | | Control (UI = 0x03) | |
| 177 | +---------------------------+ |
| 178 | | Optional Pad (0x00) | |
| 179 | +---------------------------+ |
| 180 | | NLPID | |
| 181 | +---------------------------+ |
| 182 | | . | |
| 183 | | . | |
| 184 | | . | |
| 185 | | Data | |
| 186 | | . | |
| 187 | | . | |
| 188 | +---------------------------+ |
| 189 | |
| 190 | * Q.922 addresses, as presently defined, are two octets and |
| 191 | contain a 10-bit DLCI. In some networks Q.922 addresses |
| 192 | may optionally be increased to three or four octets. |
| 193 | */ |
| 194 | |
| 195 | static void |
| 196 | fr_hdr_print(netdissect_options *ndo, int length, u_int addr_len, |
| 197 | u_int dlci, uint32_t flags, uint16_t nlpid) |
| 198 | { |
| 199 | if (ndo->ndo_qflag) { |
| 200 | ND_PRINT("Q.922, DLCI %u, length %u: ", |
| 201 | dlci, |
| 202 | length); |
| 203 | } else { |
| 204 | if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */ |
| 205 | ND_PRINT("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ", |
| 206 | addr_len, |
| 207 | dlci, |
| 208 | bittok2str(fr_header_flag_values, "none", flags), |
| 209 | tok2str(nlpid_values,"unknown", nlpid), |
| 210 | nlpid, |
| 211 | length); |
| 212 | else /* must be an ethertype */ |
| 213 | ND_PRINT("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ", |
| 214 | addr_len, |
| 215 | dlci, |
| 216 | bittok2str(fr_header_flag_values, "none", flags), |
| 217 | tok2str(ethertype_values, "unknown", nlpid), |
| 218 | nlpid, |
| 219 | length); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | /* Frame Relay */ |
| 224 | void |
| 225 | fr_if_print(netdissect_options *ndo, |
| 226 | const struct pcap_pkthdr *h, const u_char *p) |
| 227 | { |
| 228 | u_int length = h->len; |
| 229 | u_int caplen = h->caplen; |
| 230 | |
| 231 | ndo->ndo_protocol = "fr"; |
| 232 | if (caplen < 4) { /* minimum frame header length */ |
| 233 | nd_print_trunc(ndo); |
| 234 | ndo->ndo_ll_hdr_len += caplen; |
| 235 | return; |
| 236 | } |
| 237 | |
| 238 | ndo->ndo_ll_hdr_len += fr_print(ndo, p, length); |
| 239 | } |
| 240 | |
| 241 | u_int |
| 242 | fr_print(netdissect_options *ndo, |
| 243 | const u_char *p, u_int length) |
| 244 | { |
| 245 | int ret; |
| 246 | uint16_t extracted_ethertype; |
| 247 | u_int dlci; |
| 248 | u_int addr_len; |
| 249 | uint16_t nlpid; |
| 250 | u_int hdr_len; |
| 251 | uint32_t flags; |
| 252 | |
| 253 | ndo->ndo_protocol = "fr"; |
| 254 | ret = parse_q922_header(ndo, p, &dlci, &addr_len, &flags, length); |
| 255 | if (ret == -1) |
| 256 | goto trunc; |
| 257 | if (ret == 0) { |
| 258 | ND_PRINT("Q.922, invalid address"); |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | ND_TCHECK_1(p + addr_len); |
| 263 | if (length < addr_len + 1) |
| 264 | goto trunc; |
| 265 | |
| 266 | if (GET_U_1(p + addr_len) != LLC_UI && dlci != 0) { |
| 267 | /* |
| 268 | * Let's figure out if we have Cisco-style encapsulation, |
| 269 | * with an Ethernet type (Cisco HDLC type?) following the |
| 270 | * address. |
| 271 | */ |
| 272 | if (!ND_TTEST_2(p + addr_len) || length < addr_len + 2) { |
| 273 | /* no Ethertype */ |
| 274 | ND_PRINT("UI %02x! ", GET_U_1(p + addr_len)); |
| 275 | } else { |
| 276 | extracted_ethertype = GET_BE_U_2(p + addr_len); |
| 277 | |
| 278 | if (ndo->ndo_eflag) |
| 279 | fr_hdr_print(ndo, length, addr_len, dlci, |
| 280 | flags, extracted_ethertype); |
| 281 | |
| 282 | if (ethertype_print(ndo, extracted_ethertype, |
| 283 | p+addr_len+ETHERTYPE_LEN, |
| 284 | length-addr_len-ETHERTYPE_LEN, |
| 285 | ND_BYTES_AVAILABLE_AFTER(p)-addr_len-ETHERTYPE_LEN, |
| 286 | NULL, NULL) == 0) |
| 287 | /* ether_type not known, probably it wasn't one */ |
| 288 | ND_PRINT("UI %02x! ", GET_U_1(p + addr_len)); |
| 289 | else |
| 290 | return addr_len + 2; |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | ND_TCHECK_1(p + addr_len + 1); |
| 295 | if (length < addr_len + 2) |
| 296 | goto trunc; |
| 297 | |
| 298 | if (GET_U_1(p + addr_len + 1) == 0) { |
| 299 | /* |
| 300 | * Assume a pad byte after the control (UI) byte. |
| 301 | * A pad byte should only be used with 3-byte Q.922. |
| 302 | */ |
| 303 | if (addr_len != 3) |
| 304 | ND_PRINT("Pad! "); |
| 305 | hdr_len = addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */; |
| 306 | } else { |
| 307 | /* |
| 308 | * Not a pad byte. |
| 309 | * A pad byte should be used with 3-byte Q.922. |
| 310 | */ |
| 311 | if (addr_len == 3) |
| 312 | ND_PRINT("No pad! "); |
| 313 | hdr_len = addr_len + 1 /* UI */ + 1 /* NLPID */; |
| 314 | } |
| 315 | |
| 316 | ND_TCHECK_1(p + hdr_len - 1); |
| 317 | if (length < hdr_len) |
| 318 | goto trunc; |
| 319 | nlpid = GET_U_1(p + hdr_len - 1); |
| 320 | |
| 321 | if (ndo->ndo_eflag) |
| 322 | fr_hdr_print(ndo, length, addr_len, dlci, flags, nlpid); |
| 323 | p += hdr_len; |
| 324 | length -= hdr_len; |
| 325 | |
| 326 | switch (nlpid) { |
| 327 | case NLPID_IP: |
| 328 | ip_print(ndo, p, length); |
| 329 | break; |
| 330 | |
| 331 | case NLPID_IP6: |
| 332 | ip6_print(ndo, p, length); |
| 333 | break; |
| 334 | |
| 335 | case NLPID_CLNP: |
| 336 | case NLPID_ESIS: |
| 337 | case NLPID_ISIS: |
| 338 | isoclns_print(ndo, p - 1, length + 1); /* OSI printers need the NLPID field */ |
| 339 | break; |
| 340 | |
| 341 | case NLPID_SNAP: |
| 342 | if (snap_print(ndo, p, length, ND_BYTES_AVAILABLE_AFTER(p), NULL, NULL, 0) == 0) { |
| 343 | /* ether_type not known, print raw packet */ |
| 344 | if (!ndo->ndo_eflag) |
| 345 | fr_hdr_print(ndo, length + hdr_len, hdr_len, |
| 346 | dlci, flags, nlpid); |
| 347 | if (!ndo->ndo_suppress_default_print) |
| 348 | ND_DEFAULTPRINT(p - hdr_len, length + hdr_len); |
| 349 | } |
| 350 | break; |
| 351 | |
| 352 | case NLPID_Q933: |
| 353 | q933_print(ndo, p, length); |
| 354 | break; |
| 355 | |
| 356 | case NLPID_MFR: |
| 357 | frf15_print(ndo, p, length); |
| 358 | break; |
| 359 | |
| 360 | case NLPID_PPP: |
| 361 | ppp_print(ndo, p, length); |
| 362 | break; |
| 363 | |
| 364 | default: |
| 365 | if (!ndo->ndo_eflag) |
| 366 | fr_hdr_print(ndo, length + hdr_len, addr_len, |
| 367 | dlci, flags, nlpid); |
| 368 | if (!ndo->ndo_xflag) |
| 369 | ND_DEFAULTPRINT(p, length); |
| 370 | } |
| 371 | |
| 372 | return hdr_len; |
| 373 | |
| 374 | trunc: |
| 375 | nd_print_trunc(ndo); |
| 376 | return 0; |
| 377 | |
| 378 | } |
| 379 | |
| 380 | /* Multi Link Frame Relay (FRF.16) */ |
| 381 | void |
| 382 | mfr_if_print(netdissect_options *ndo, |
| 383 | const struct pcap_pkthdr *h, const u_char *p) |
| 384 | { |
| 385 | u_int length = h->len; |
| 386 | u_int caplen = h->caplen; |
| 387 | |
| 388 | ndo->ndo_protocol = "mfr"; |
| 389 | if (caplen < 2) { /* minimum frame header length */ |
| 390 | nd_print_trunc(ndo); |
| 391 | ndo->ndo_ll_hdr_len += caplen; |
| 392 | return; |
| 393 | } |
| 394 | |
| 395 | ndo->ndo_ll_hdr_len += mfr_print(ndo, p, length); |
| 396 | } |
| 397 | |
| 398 | |
| 399 | #define MFR_CTRL_MSG_ADD_LINK 1 |
| 400 | #define MFR_CTRL_MSG_ADD_LINK_ACK 2 |
| 401 | #define MFR_CTRL_MSG_ADD_LINK_REJ 3 |
| 402 | #define MFR_CTRL_MSG_HELLO 4 |
| 403 | #define MFR_CTRL_MSG_HELLO_ACK 5 |
| 404 | #define MFR_CTRL_MSG_REMOVE_LINK 6 |
| 405 | #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7 |
| 406 | |
| 407 | static const struct tok mfr_ctrl_msg_values[] = { |
| 408 | { MFR_CTRL_MSG_ADD_LINK, "Add Link" }, |
| 409 | { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" }, |
| 410 | { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" }, |
| 411 | { MFR_CTRL_MSG_HELLO, "Hello" }, |
| 412 | { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" }, |
| 413 | { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" }, |
| 414 | { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" }, |
| 415 | { 0, NULL } |
| 416 | }; |
| 417 | |
| 418 | #define MFR_CTRL_IE_BUNDLE_ID 1 |
| 419 | #define MFR_CTRL_IE_LINK_ID 2 |
| 420 | #define MFR_CTRL_IE_MAGIC_NUM 3 |
| 421 | #define MFR_CTRL_IE_TIMESTAMP 5 |
| 422 | #define MFR_CTRL_IE_VENDOR_EXT 6 |
| 423 | #define MFR_CTRL_IE_CAUSE 7 |
| 424 | |
| 425 | static const struct tok mfr_ctrl_ie_values[] = { |
| 426 | { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"}, |
| 427 | { MFR_CTRL_IE_LINK_ID, "Link ID"}, |
| 428 | { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"}, |
| 429 | { MFR_CTRL_IE_TIMESTAMP, "Timestamp"}, |
| 430 | { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"}, |
| 431 | { MFR_CTRL_IE_CAUSE, "Cause"}, |
| 432 | { 0, NULL } |
| 433 | }; |
| 434 | |
| 435 | #define MFR_ID_STRING_MAXLEN 50 |
| 436 | |
| 437 | struct ie_tlv_header_t { |
| 438 | uint8_t ie_type; |
| 439 | uint8_t ie_len; |
| 440 | }; |
| 441 | |
| 442 | u_int |
| 443 | mfr_print(netdissect_options *ndo, |
| 444 | const u_char *p, u_int length) |
| 445 | { |
| 446 | u_int tlen,idx,hdr_len = 0; |
| 447 | uint16_t sequence_num; |
| 448 | uint8_t ie_type,ie_len; |
| 449 | const uint8_t *tptr; |
| 450 | |
| 451 | |
| 452 | /* |
| 453 | * FRF.16 Link Integrity Control Frame |
| 454 | * |
| 455 | * 7 6 5 4 3 2 1 0 |
| 456 | * +----+----+----+----+----+----+----+----+ |
| 457 | * | B | E | C=1| 0 0 0 0 | EA | |
| 458 | * +----+----+----+----+----+----+----+----+ |
| 459 | * | 0 0 0 0 0 0 0 0 | |
| 460 | * +----+----+----+----+----+----+----+----+ |
| 461 | * | message type | |
| 462 | * +----+----+----+----+----+----+----+----+ |
| 463 | */ |
| 464 | |
| 465 | ndo->ndo_protocol = "mfr"; |
| 466 | |
| 467 | if (length < 4) { /* minimum frame header length */ |
| 468 | ND_PRINT("[length %u < 4]", length); |
| 469 | nd_print_invalid(ndo); |
| 470 | return length; |
| 471 | } |
| 472 | ND_TCHECK_4(p); |
| 473 | |
| 474 | if ((GET_U_1(p) & MFR_BEC_MASK) == MFR_CTRL_FRAME && GET_U_1(p + 1) == 0) { |
| 475 | ND_PRINT("FRF.16 Control, Flags [%s], %s, length %u", |
| 476 | bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK)), |
| 477 | tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",GET_U_1(p + 2)), |
| 478 | length); |
| 479 | tptr = p + 3; |
| 480 | tlen = length -3; |
| 481 | hdr_len = 3; |
| 482 | |
| 483 | if (!ndo->ndo_vflag) |
| 484 | return hdr_len; |
| 485 | |
| 486 | while (tlen>sizeof(struct ie_tlv_header_t)) { |
| 487 | ND_TCHECK_LEN(tptr, sizeof(struct ie_tlv_header_t)); |
| 488 | ie_type=GET_U_1(tptr); |
| 489 | ie_len=GET_U_1(tptr + 1); |
| 490 | |
| 491 | ND_PRINT("\n\tIE %s (%u), length %u: ", |
| 492 | tok2str(mfr_ctrl_ie_values,"Unknown",ie_type), |
| 493 | ie_type, |
| 494 | ie_len); |
| 495 | |
| 496 | /* infinite loop check */ |
| 497 | if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t)) |
| 498 | return hdr_len; |
| 499 | |
| 500 | ND_TCHECK_LEN(tptr, ie_len); |
| 501 | tptr+=sizeof(struct ie_tlv_header_t); |
| 502 | /* tlv len includes header */ |
| 503 | ie_len-=sizeof(struct ie_tlv_header_t); |
| 504 | tlen-=sizeof(struct ie_tlv_header_t); |
| 505 | |
| 506 | switch (ie_type) { |
| 507 | |
| 508 | case MFR_CTRL_IE_MAGIC_NUM: |
| 509 | /* FRF.16.1 Section 3.4.3 Magic Number Information Element */ |
| 510 | if (ie_len != 4) { |
| 511 | ND_PRINT("[IE data length %d != 4]", ie_len); |
| 512 | nd_print_invalid(ndo); |
| 513 | break; |
| 514 | } |
| 515 | ND_PRINT("0x%08x", GET_BE_U_4(tptr)); |
| 516 | break; |
| 517 | |
| 518 | case MFR_CTRL_IE_BUNDLE_ID: /* same message format */ |
| 519 | case MFR_CTRL_IE_LINK_ID: |
| 520 | for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) { |
| 521 | if (GET_U_1(tptr + idx) != 0) /* don't print null termination */ |
| 522 | fn_print_char(ndo, GET_U_1(tptr + idx)); |
| 523 | else |
| 524 | break; |
| 525 | } |
| 526 | break; |
| 527 | |
| 528 | case MFR_CTRL_IE_TIMESTAMP: |
| 529 | if (ie_len == sizeof(struct timeval)) { |
| 530 | ts_print(ndo, (const struct timeval *)tptr); |
| 531 | break; |
| 532 | } |
| 533 | /* fall through and hexdump if no unix timestamp */ |
| 534 | ND_FALL_THROUGH; |
| 535 | |
| 536 | /* |
| 537 | * FIXME those are the defined IEs that lack a decoder |
| 538 | * you are welcome to contribute code ;-) |
| 539 | */ |
| 540 | |
| 541 | case MFR_CTRL_IE_VENDOR_EXT: |
| 542 | case MFR_CTRL_IE_CAUSE: |
| 543 | |
| 544 | default: |
| 545 | if (ndo->ndo_vflag <= 1) |
| 546 | print_unknown_data(ndo, tptr, "\n\t ", ie_len); |
| 547 | break; |
| 548 | } |
| 549 | |
| 550 | /* do we want to see a hexdump of the IE ? */ |
| 551 | if (ndo->ndo_vflag > 1 ) |
| 552 | print_unknown_data(ndo, tptr, "\n\t ", ie_len); |
| 553 | |
| 554 | tlen-=ie_len; |
| 555 | tptr+=ie_len; |
| 556 | } |
| 557 | return hdr_len; |
| 558 | } |
| 559 | /* |
| 560 | * FRF.16 Fragmentation Frame |
| 561 | * |
| 562 | * 7 6 5 4 3 2 1 0 |
| 563 | * +----+----+----+----+----+----+----+----+ |
| 564 | * | B | E | C=0|seq. (high 4 bits) | EA | |
| 565 | * +----+----+----+----+----+----+----+----+ |
| 566 | * | sequence (low 8 bits) | |
| 567 | * +----+----+----+----+----+----+----+----+ |
| 568 | * | DLCI (6 bits) | CR | EA | |
| 569 | * +----+----+----+----+----+----+----+----+ |
| 570 | * | DLCI (4 bits) |FECN|BECN| DE | EA | |
| 571 | * +----+----+----+----+----+----+----+----+ |
| 572 | */ |
| 573 | |
| 574 | sequence_num = (GET_U_1(p)&0x1e)<<7 | GET_U_1(p + 1); |
| 575 | /* whole packet or first fragment ? */ |
| 576 | if ((GET_U_1(p) & MFR_BEC_MASK) == MFR_FRAG_FRAME || |
| 577 | (GET_U_1(p) & MFR_BEC_MASK) == MFR_B_BIT) { |
| 578 | ND_PRINT("FRF.16 Frag, seq %u, Flags [%s], ", |
| 579 | sequence_num, |
| 580 | bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK))); |
| 581 | hdr_len = 2; |
| 582 | fr_print(ndo, p+hdr_len,length-hdr_len); |
| 583 | return hdr_len; |
| 584 | } |
| 585 | |
| 586 | /* must be a middle or the last fragment */ |
| 587 | ND_PRINT("FRF.16 Frag, seq %u, Flags [%s]", |
| 588 | sequence_num, |
| 589 | bittok2str(frf_flag_values,"none",(GET_U_1(p) & MFR_BEC_MASK))); |
| 590 | print_unknown_data(ndo, p, "\n\t", length); |
| 591 | |
| 592 | return hdr_len; |
| 593 | |
| 594 | trunc: |
| 595 | nd_print_trunc(ndo); |
| 596 | return length; |
| 597 | } |
| 598 | |
| 599 | /* an NLPID of 0xb1 indicates a 2-byte |
| 600 | * FRF.15 header |
| 601 | * |
| 602 | * 7 6 5 4 3 2 1 0 |
| 603 | * +----+----+----+----+----+----+----+----+ |
| 604 | * ~ Q.922 header ~ |
| 605 | * +----+----+----+----+----+----+----+----+ |
| 606 | * | NLPID (8 bits) | NLPID=0xb1 |
| 607 | * +----+----+----+----+----+----+----+----+ |
| 608 | * | B | E | C |seq. (high 4 bits) | R | |
| 609 | * +----+----+----+----+----+----+----+----+ |
| 610 | * | sequence (low 8 bits) | |
| 611 | * +----+----+----+----+----+----+----+----+ |
| 612 | */ |
| 613 | |
| 614 | #define FR_FRF15_FRAGTYPE 0x01 |
| 615 | |
| 616 | static void |
| 617 | frf15_print(netdissect_options *ndo, |
| 618 | const u_char *p, u_int length) |
| 619 | { |
| 620 | uint16_t sequence_num, flags; |
| 621 | |
| 622 | if (length < 2) |
| 623 | goto trunc; |
| 624 | |
| 625 | flags = GET_U_1(p)&MFR_BEC_MASK; |
| 626 | sequence_num = (GET_U_1(p)&0x1e)<<7 | GET_U_1(p + 1); |
| 627 | |
| 628 | ND_PRINT("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u", |
| 629 | sequence_num, |
| 630 | bittok2str(frf_flag_values,"none",flags), |
| 631 | GET_U_1(p)&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End", |
| 632 | length); |
| 633 | |
| 634 | /* TODO: |
| 635 | * depending on all permutations of the B, E and C bit |
| 636 | * dig as deep as we can - e.g. on the first (B) fragment |
| 637 | * there is enough payload to print the IP header |
| 638 | * on non (B) fragments it depends if the fragmentation |
| 639 | * model is end-to-end or interface based whether we want to print |
| 640 | * another Q.922 header |
| 641 | */ |
| 642 | return; |
| 643 | |
| 644 | trunc: |
| 645 | nd_print_trunc(ndo); |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Q.933 decoding portion for framerelay specific. |
| 650 | */ |
| 651 | |
| 652 | /* Q.933 packet format |
| 653 | Format of Other Protocols |
| 654 | using Q.933 NLPID |
| 655 | +-------------------------------+ |
| 656 | | Q.922 Address | |
| 657 | +---------------+---------------+ |
| 658 | |Control 0x03 | NLPID 0x08 | |
| 659 | +---------------+---------------+ |
| 660 | | L2 Protocol ID | |
| 661 | | octet 1 | octet 2 | |
| 662 | +-------------------------------+ |
| 663 | | L3 Protocol ID | |
| 664 | | octet 2 | octet 2 | |
| 665 | +-------------------------------+ |
| 666 | | Protocol Data | |
| 667 | +-------------------------------+ |
| 668 | | FCS | |
| 669 | +-------------------------------+ |
| 670 | */ |
| 671 | |
| 672 | /* L2 (Octet 1)- Call Reference Usually is 0x0 */ |
| 673 | |
| 674 | /* |
| 675 | * L2 (Octet 2)- Message Types definition 1 byte long. |
| 676 | */ |
| 677 | /* Call Establish */ |
| 678 | #define MSG_TYPE_ESC_TO_NATIONAL 0x00 |
| 679 | #define MSG_TYPE_ALERT 0x01 |
| 680 | #define MSG_TYPE_CALL_PROCEEDING 0x02 |
| 681 | #define MSG_TYPE_CONNECT 0x07 |
| 682 | #define MSG_TYPE_CONNECT_ACK 0x0F |
| 683 | #define MSG_TYPE_PROGRESS 0x03 |
| 684 | #define MSG_TYPE_SETUP 0x05 |
| 685 | /* Call Clear */ |
| 686 | #define MSG_TYPE_DISCONNECT 0x45 |
| 687 | #define MSG_TYPE_RELEASE 0x4D |
| 688 | #define MSG_TYPE_RELEASE_COMPLETE 0x5A |
| 689 | #define MSG_TYPE_RESTART 0x46 |
| 690 | #define MSG_TYPE_RESTART_ACK 0x4E |
| 691 | /* Status */ |
| 692 | #define MSG_TYPE_STATUS 0x7D |
| 693 | #define MSG_TYPE_STATUS_ENQ 0x75 |
| 694 | |
| 695 | static const struct tok fr_q933_msg_values[] = { |
| 696 | { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" }, |
| 697 | { MSG_TYPE_ALERT, "Alert" }, |
| 698 | { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" }, |
| 699 | { MSG_TYPE_CONNECT, "Connect" }, |
| 700 | { MSG_TYPE_CONNECT_ACK, "Connect ACK" }, |
| 701 | { MSG_TYPE_PROGRESS, "Progress" }, |
| 702 | { MSG_TYPE_SETUP, "Setup" }, |
| 703 | { MSG_TYPE_DISCONNECT, "Disconnect" }, |
| 704 | { MSG_TYPE_RELEASE, "Release" }, |
| 705 | { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" }, |
| 706 | { MSG_TYPE_RESTART, "Restart" }, |
| 707 | { MSG_TYPE_RESTART_ACK, "Restart ACK" }, |
| 708 | { MSG_TYPE_STATUS, "Status Reply" }, |
| 709 | { MSG_TYPE_STATUS_ENQ, "Status Enquiry" }, |
| 710 | { 0, NULL } |
| 711 | }; |
| 712 | |
| 713 | #define IE_IS_SINGLE_OCTET(iecode) ((iecode) & 0x80) |
| 714 | #define IE_IS_SHIFT(iecode) (((iecode) & 0xF0) == 0x90) |
| 715 | #define IE_SHIFT_IS_NON_LOCKING(iecode) ((iecode) & 0x08) |
| 716 | #define IE_SHIFT_IS_LOCKING(iecode) (!(IE_SHIFT_IS_NON_LOCKING(iecode))) |
| 717 | #define IE_SHIFT_CODESET(iecode) ((iecode) & 0x07) |
| 718 | |
| 719 | #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01 |
| 720 | #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */ |
| 721 | #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03 |
| 722 | #define FR_LMI_ANSI_PVC_STATUS_IE 0x07 |
| 723 | |
| 724 | #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51 |
| 725 | #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53 |
| 726 | #define FR_LMI_CCITT_PVC_STATUS_IE 0x57 |
| 727 | |
| 728 | static const struct tok fr_q933_ie_values_codeset_0_5[] = { |
| 729 | { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" }, |
| 730 | { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" }, |
| 731 | { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" }, |
| 732 | { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" }, |
| 733 | { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" }, |
| 734 | { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" }, |
| 735 | { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" }, |
| 736 | { 0, NULL } |
| 737 | }; |
| 738 | |
| 739 | #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0 |
| 740 | #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1 |
| 741 | #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2 |
| 742 | |
| 743 | static const struct tok fr_lmi_report_type_ie_values[] = { |
| 744 | { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" }, |
| 745 | { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" }, |
| 746 | { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" }, |
| 747 | { 0, NULL } |
| 748 | }; |
| 749 | |
| 750 | /* array of 16 codesets - currently we only support codepage 0 and 5 */ |
| 751 | static const struct tok *fr_q933_ie_codesets[] = { |
| 752 | fr_q933_ie_values_codeset_0_5, |
| 753 | NULL, |
| 754 | NULL, |
| 755 | NULL, |
| 756 | NULL, |
| 757 | fr_q933_ie_values_codeset_0_5, |
| 758 | NULL, |
| 759 | NULL, |
| 760 | NULL, |
| 761 | NULL, |
| 762 | NULL, |
| 763 | NULL, |
| 764 | NULL, |
| 765 | NULL, |
| 766 | NULL, |
| 767 | NULL |
| 768 | }; |
| 769 | |
| 770 | static int fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode, |
| 771 | u_int ielength, const u_char *p); |
| 772 | |
| 773 | typedef int (*codeset_pr_func_t)(netdissect_options *, u_int iecode, |
| 774 | u_int ielength, const u_char *p); |
| 775 | |
| 776 | /* array of 16 codesets - currently we only support codepage 0 and 5 */ |
| 777 | static const codeset_pr_func_t fr_q933_print_ie_codeset[] = { |
| 778 | fr_q933_print_ie_codeset_0_5, |
| 779 | NULL, |
| 780 | NULL, |
| 781 | NULL, |
| 782 | NULL, |
| 783 | fr_q933_print_ie_codeset_0_5, |
| 784 | NULL, |
| 785 | NULL, |
| 786 | NULL, |
| 787 | NULL, |
| 788 | NULL, |
| 789 | NULL, |
| 790 | NULL, |
| 791 | NULL, |
| 792 | NULL, |
| 793 | NULL |
| 794 | }; |
| 795 | |
| 796 | /* |
| 797 | * ITU-T Q.933. |
| 798 | * |
| 799 | * p points to octet 2, the octet containing the length of the |
| 800 | * call reference value, so p[n] is octet n+2 ("octet X" is as |
| 801 | * used in Q.931/Q.933). |
| 802 | * |
| 803 | * XXX - actually used both for Q.931 and Q.933. |
| 804 | */ |
| 805 | void |
| 806 | q933_print(netdissect_options *ndo, |
| 807 | const u_char *p, u_int length) |
| 808 | { |
| 809 | u_int olen; |
| 810 | u_int call_ref_length, i; |
| 811 | uint8_t call_ref[15]; /* maximum length - length field is 4 bits */ |
| 812 | u_int msgtype; |
| 813 | u_int iecode; |
| 814 | u_int ielength; |
| 815 | u_int codeset = 0; |
| 816 | u_int is_ansi = 0; |
| 817 | u_int ie_is_known; |
| 818 | u_int non_locking_shift; |
| 819 | u_int unshift_codeset; |
| 820 | |
| 821 | ndo->ndo_protocol = "q.933"; |
| 822 | ND_PRINT("%s", ndo->ndo_eflag ? "" : "Q.933"); |
| 823 | |
| 824 | if (length == 0 || !ND_TTEST_1(p)) { |
| 825 | if (!ndo->ndo_eflag) |
| 826 | ND_PRINT(", "); |
| 827 | ND_PRINT("length %u", length); |
| 828 | goto trunc; |
| 829 | } |
| 830 | |
| 831 | /* |
| 832 | * Get the length of the call reference value. |
| 833 | */ |
| 834 | olen = length; /* preserve the original length for display */ |
| 835 | call_ref_length = GET_U_1(p) & 0x0f; |
| 836 | p++; |
| 837 | length--; |
| 838 | |
| 839 | /* |
| 840 | * Get the call reference value. |
| 841 | */ |
| 842 | for (i = 0; i < call_ref_length; i++) { |
| 843 | if (length == 0 || !ND_TTEST_1(p)) { |
| 844 | if (!ndo->ndo_eflag) |
| 845 | ND_PRINT(", "); |
| 846 | ND_PRINT("length %u", olen); |
| 847 | goto trunc; |
| 848 | } |
| 849 | call_ref[i] = GET_U_1(p); |
| 850 | p++; |
| 851 | length--; |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * Get the message type. |
| 856 | */ |
| 857 | if (length == 0 || !ND_TTEST_1(p)) { |
| 858 | if (!ndo->ndo_eflag) |
| 859 | ND_PRINT(", "); |
| 860 | ND_PRINT("length %u", olen); |
| 861 | goto trunc; |
| 862 | } |
| 863 | msgtype = GET_U_1(p); |
| 864 | p++; |
| 865 | length--; |
| 866 | |
| 867 | /* |
| 868 | * Peek ahead to see if we start with a shift. |
| 869 | */ |
| 870 | non_locking_shift = 0; |
| 871 | unshift_codeset = codeset; |
| 872 | if (length != 0) { |
| 873 | if (!ND_TTEST_1(p)) { |
| 874 | if (!ndo->ndo_eflag) |
| 875 | ND_PRINT(", "); |
| 876 | ND_PRINT("length %u", olen); |
| 877 | goto trunc; |
| 878 | } |
| 879 | iecode = GET_U_1(p); |
| 880 | if (IE_IS_SHIFT(iecode)) { |
| 881 | /* |
| 882 | * It's a shift. Skip over it. |
| 883 | */ |
| 884 | p++; |
| 885 | length--; |
| 886 | |
| 887 | /* |
| 888 | * Get the codeset. |
| 889 | */ |
| 890 | codeset = IE_SHIFT_CODESET(iecode); |
| 891 | |
| 892 | /* |
| 893 | * If it's a locking shift to codeset 5, |
| 894 | * mark this as ANSI. (XXX - 5 is actually |
| 895 | * for national variants in general, not |
| 896 | * the US variant in particular, but maybe |
| 897 | * this is more American exceptionalism. :-)) |
| 898 | */ |
| 899 | if (IE_SHIFT_IS_LOCKING(iecode)) { |
| 900 | /* |
| 901 | * It's a locking shift. |
| 902 | */ |
| 903 | if (codeset == 5) { |
| 904 | /* |
| 905 | * It's a locking shift to |
| 906 | * codeset 5, so this is |
| 907 | * T1.617 Annex D. |
| 908 | */ |
| 909 | is_ansi = 1; |
| 910 | } |
| 911 | } else { |
| 912 | /* |
| 913 | * It's a non-locking shift. |
| 914 | * Remember the current codeset, so we |
| 915 | * can revert to it after the next IE. |
| 916 | */ |
| 917 | non_locking_shift = 1; |
| 918 | unshift_codeset = 0; |
| 919 | } |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | /* printing out header part */ |
| 924 | if (!ndo->ndo_eflag) |
| 925 | ND_PRINT(", "); |
| 926 | ND_PRINT("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset); |
| 927 | |
| 928 | if (call_ref_length != 0) { |
| 929 | if (call_ref_length > 1 || GET_U_1(p) != 0) { |
| 930 | /* |
| 931 | * Not a dummy call reference. |
| 932 | */ |
| 933 | ND_PRINT(", Call Ref: 0x"); |
| 934 | for (i = 0; i < call_ref_length; i++) |
| 935 | ND_PRINT("%02x", call_ref[i]); |
| 936 | } |
| 937 | } |
| 938 | if (ndo->ndo_vflag) { |
| 939 | ND_PRINT(", %s (0x%02x), length %u", |
| 940 | tok2str(fr_q933_msg_values, |
| 941 | "unknown message", msgtype), |
| 942 | msgtype, |
| 943 | olen); |
| 944 | } else { |
| 945 | ND_PRINT(", %s", |
| 946 | tok2str(fr_q933_msg_values, |
| 947 | "unknown message 0x%02x", msgtype)); |
| 948 | } |
| 949 | |
| 950 | /* Loop through the rest of the IEs */ |
| 951 | while (length != 0) { |
| 952 | /* |
| 953 | * What's the state of any non-locking shifts? |
| 954 | */ |
| 955 | if (non_locking_shift == 1) { |
| 956 | /* |
| 957 | * There's a non-locking shift in effect for |
| 958 | * this IE. Count it, so we reset the codeset |
| 959 | * before the next IE. |
| 960 | */ |
| 961 | non_locking_shift = 2; |
| 962 | } else if (non_locking_shift == 2) { |
| 963 | /* |
| 964 | * Unshift. |
| 965 | */ |
| 966 | codeset = unshift_codeset; |
| 967 | non_locking_shift = 0; |
| 968 | } |
| 969 | |
| 970 | /* |
| 971 | * Get the first octet of the IE. |
| 972 | */ |
| 973 | if (!ND_TTEST_1(p)) { |
| 974 | if (!ndo->ndo_vflag) { |
| 975 | ND_PRINT(", length %u", olen); |
| 976 | } |
| 977 | goto trunc; |
| 978 | } |
| 979 | iecode = GET_U_1(p); |
| 980 | p++; |
| 981 | length--; |
| 982 | |
| 983 | /* Single-octet IE? */ |
| 984 | if (IE_IS_SINGLE_OCTET(iecode)) { |
| 985 | /* |
| 986 | * Yes. Is it a shift? |
| 987 | */ |
| 988 | if (IE_IS_SHIFT(iecode)) { |
| 989 | /* |
| 990 | * Yes. Is it locking? |
| 991 | */ |
| 992 | if (IE_SHIFT_IS_LOCKING(iecode)) { |
| 993 | /* |
| 994 | * Yes. |
| 995 | */ |
| 996 | non_locking_shift = 0; |
| 997 | } else { |
| 998 | /* |
| 999 | * No. Remember the current |
| 1000 | * codeset, so we can revert |
| 1001 | * to it after the next IE. |
| 1002 | */ |
| 1003 | non_locking_shift = 1; |
| 1004 | unshift_codeset = codeset; |
| 1005 | } |
| 1006 | |
| 1007 | /* |
| 1008 | * Get the codeset. |
| 1009 | */ |
| 1010 | codeset = IE_SHIFT_CODESET(iecode); |
| 1011 | } |
| 1012 | } else { |
| 1013 | /* |
| 1014 | * No. Get the IE length. |
| 1015 | */ |
| 1016 | if (length == 0 || !ND_TTEST_1(p)) { |
| 1017 | if (!ndo->ndo_vflag) { |
| 1018 | ND_PRINT(", length %u", olen); |
| 1019 | } |
| 1020 | goto trunc; |
| 1021 | } |
| 1022 | ielength = GET_U_1(p); |
| 1023 | p++; |
| 1024 | length--; |
| 1025 | |
| 1026 | /* lets do the full IE parsing only in verbose mode |
| 1027 | * however some IEs (DLCI Status, Link Verify) |
| 1028 | * are also interesting in non-verbose mode */ |
| 1029 | if (ndo->ndo_vflag) { |
| 1030 | ND_PRINT("\n\t%s IE (0x%02x), length %u: ", |
| 1031 | tok2str(fr_q933_ie_codesets[codeset], |
| 1032 | "unknown", iecode), |
| 1033 | iecode, |
| 1034 | ielength); |
| 1035 | } |
| 1036 | |
| 1037 | /* sanity checks */ |
| 1038 | if (iecode == 0 || ielength == 0) { |
| 1039 | return; |
| 1040 | } |
| 1041 | if (length < ielength || !ND_TTEST_LEN(p, ielength)) { |
| 1042 | if (!ndo->ndo_vflag) { |
| 1043 | ND_PRINT(", length %u", olen); |
| 1044 | } |
| 1045 | goto trunc; |
| 1046 | } |
| 1047 | |
| 1048 | ie_is_known = 0; |
| 1049 | if (fr_q933_print_ie_codeset[codeset] != NULL) { |
| 1050 | ie_is_known = fr_q933_print_ie_codeset[codeset](ndo, iecode, ielength, p); |
| 1051 | } |
| 1052 | |
| 1053 | if (ie_is_known) { |
| 1054 | /* |
| 1055 | * Known IE; do we want to see a hexdump |
| 1056 | * of it? |
| 1057 | */ |
| 1058 | if (ndo->ndo_vflag > 1) { |
| 1059 | /* Yes. */ |
| 1060 | print_unknown_data(ndo, p, "\n\t ", ielength); |
| 1061 | } |
| 1062 | } else { |
| 1063 | /* |
| 1064 | * Unknown IE; if we're printing verbosely, |
| 1065 | * print its content in hex. |
| 1066 | */ |
| 1067 | if (ndo->ndo_vflag >= 1) { |
| 1068 | print_unknown_data(ndo, p, "\n\t", ielength); |
| 1069 | } |
| 1070 | } |
| 1071 | |
| 1072 | length -= ielength; |
| 1073 | p += ielength; |
| 1074 | } |
| 1075 | } |
| 1076 | if (!ndo->ndo_vflag) { |
| 1077 | ND_PRINT(", length %u", olen); |
| 1078 | } |
| 1079 | return; |
| 1080 | |
| 1081 | trunc: |
| 1082 | nd_print_trunc(ndo); |
| 1083 | } |
| 1084 | |
| 1085 | static int |
| 1086 | fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode, |
| 1087 | u_int ielength, const u_char *p) |
| 1088 | { |
| 1089 | u_int dlci; |
| 1090 | |
| 1091 | switch (iecode) { |
| 1092 | |
| 1093 | case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */ |
| 1094 | case FR_LMI_CCITT_REPORT_TYPE_IE: |
| 1095 | if (ielength < 1) { |
| 1096 | if (!ndo->ndo_vflag) { |
| 1097 | ND_PRINT(", "); |
| 1098 | } |
| 1099 | ND_PRINT("Invalid REPORT TYPE IE"); |
| 1100 | return 1; |
| 1101 | } |
| 1102 | if (ndo->ndo_vflag) { |
| 1103 | ND_PRINT("%s (%u)", |
| 1104 | tok2str(fr_lmi_report_type_ie_values,"unknown",GET_U_1(p)), |
| 1105 | GET_U_1(p)); |
| 1106 | } |
| 1107 | return 1; |
| 1108 | |
| 1109 | case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */ |
| 1110 | case FR_LMI_CCITT_LINK_VERIFY_IE: |
| 1111 | case FR_LMI_ANSI_LINK_VERIFY_IE_91: |
| 1112 | if (!ndo->ndo_vflag) { |
| 1113 | ND_PRINT(", "); |
| 1114 | } |
| 1115 | if (ielength < 2) { |
| 1116 | ND_PRINT("Invalid LINK VERIFY IE"); |
| 1117 | return 1; |
| 1118 | } |
| 1119 | ND_PRINT("TX Seq: %3d, RX Seq: %3d", GET_U_1(p), GET_U_1(p + 1)); |
| 1120 | return 1; |
| 1121 | |
| 1122 | case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */ |
| 1123 | case FR_LMI_CCITT_PVC_STATUS_IE: |
| 1124 | if (!ndo->ndo_vflag) { |
| 1125 | ND_PRINT(", "); |
| 1126 | } |
| 1127 | /* now parse the DLCI information element. */ |
| 1128 | if ((ielength < 3) || |
| 1129 | (GET_U_1(p) & 0x80) || |
| 1130 | ((ielength == 3) && !(GET_U_1(p + 1) & 0x80)) || |
| 1131 | ((ielength == 4) && |
| 1132 | ((GET_U_1(p + 1) & 0x80) || !(GET_U_1(p + 2) & 0x80))) || |
| 1133 | ((ielength == 5) && |
| 1134 | ((GET_U_1(p + 1) & 0x80) || (GET_U_1(p + 2) & 0x80) || |
| 1135 | !(GET_U_1(p + 3) & 0x80))) || |
| 1136 | (ielength > 5) || |
| 1137 | !(GET_U_1(p + ielength - 1) & 0x80)) { |
| 1138 | ND_PRINT("Invalid DLCI in PVC STATUS IE"); |
| 1139 | return 1; |
| 1140 | } |
| 1141 | |
| 1142 | dlci = ((GET_U_1(p) & 0x3F) << 4) | ((GET_U_1(p + 1) & 0x78) >> 3); |
| 1143 | if (ielength == 4) { |
| 1144 | dlci = (dlci << 6) | ((GET_U_1(p + 2) & 0x7E) >> 1); |
| 1145 | } |
| 1146 | else if (ielength == 5) { |
| 1147 | dlci = (dlci << 13) | (GET_U_1(p + 2) & 0x7F) | ((GET_U_1(p + 3) & 0x7E) >> 1); |
| 1148 | } |
| 1149 | |
| 1150 | ND_PRINT("DLCI %u: status %s%s", dlci, |
| 1151 | GET_U_1(p + ielength - 1) & 0x8 ? "New, " : "", |
| 1152 | GET_U_1(p + ielength - 1) & 0x2 ? "Active" : "Inactive"); |
| 1153 | return 1; |
| 1154 | } |
| 1155 | |
| 1156 | return 0; |
| 1157 | } |