| 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 | #ifndef lint |
| 23 | static const char rcsid[] _U_ = |
| 24 | "@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.32.2.15 2006/02/01 14:39:56 hannes Exp $ (LBL)"; |
| 25 | #endif |
| 26 | |
| 27 | #ifdef HAVE_CONFIG_H |
| 28 | #include "config.h" |
| 29 | #endif |
| 30 | |
| 31 | #include <tcpdump-stdinc.h> |
| 32 | |
| 33 | #include <stdio.h> |
| 34 | #include <string.h> |
| 35 | #include <pcap.h> |
| 36 | |
| 37 | #include "addrtoname.h" |
| 38 | #include "interface.h" |
| 39 | #include "ethertype.h" |
| 40 | #include "nlpid.h" |
| 41 | #include "extract.h" |
| 42 | #include "oui.h" |
| 43 | |
| 44 | static void frf15_print(const u_char *, u_int); |
| 45 | |
| 46 | /* |
| 47 | * the frame relay header has a variable length |
| 48 | * |
| 49 | * the EA bit determines if there is another byte |
| 50 | * in the header |
| 51 | * |
| 52 | * minimum header length is 2 bytes |
| 53 | * maximum header length is 4 bytes |
| 54 | * |
| 55 | * 7 6 5 4 3 2 1 0 |
| 56 | * +----+----+----+----+----+----+----+----+ |
| 57 | * | DLCI (6 bits) | CR | EA | |
| 58 | * +----+----+----+----+----+----+----+----+ |
| 59 | * | DLCI (4 bits) |FECN|BECN| DE | EA | |
| 60 | * +----+----+----+----+----+----+----+----+ |
| 61 | * | DLCI (7 bits) | EA | |
| 62 | * +----+----+----+----+----+----+----+----+ |
| 63 | * | DLCI (6 bits) |SDLC| EA | |
| 64 | * +----+----+----+----+----+----+----+----+ |
| 65 | */ |
| 66 | |
| 67 | #define FR_EA_BIT 0x01 |
| 68 | |
| 69 | #define FR_CR_BIT 0x02000000 |
| 70 | #define FR_DE_BIT 0x00020000 |
| 71 | #define FR_BECN_BIT 0x00040000 |
| 72 | #define FR_FECN_BIT 0x00080000 |
| 73 | #define FR_SDLC_BIT 0x00000002 |
| 74 | |
| 75 | |
| 76 | struct tok fr_header_flag_values[] = { |
| 77 | { FR_CR_BIT, "C!" }, |
| 78 | { FR_DE_BIT, "DE" }, |
| 79 | { FR_BECN_BIT, "BECN" }, |
| 80 | { FR_FECN_BIT, "FECN" }, |
| 81 | { FR_SDLC_BIT, "sdlcore" }, |
| 82 | { 0, NULL } |
| 83 | }; |
| 84 | |
| 85 | /* FRF.15 / FRF.16 */ |
| 86 | #define MFR_B_BIT 0x80 |
| 87 | #define MFR_E_BIT 0x40 |
| 88 | #define MFR_C_BIT 0x20 |
| 89 | #define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) |
| 90 | #define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT) |
| 91 | #define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT ) |
| 92 | |
| 93 | struct tok frf_flag_values[] = { |
| 94 | { MFR_B_BIT, "Begin" }, |
| 95 | { MFR_E_BIT, "End" }, |
| 96 | { MFR_C_BIT, "Control" }, |
| 97 | { 0, NULL } |
| 98 | }; |
| 99 | |
| 100 | /* Finds out Q.922 address length, DLCI and flags. Returns 0 on success |
| 101 | * save the flags dep. on address length |
| 102 | */ |
| 103 | static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore, |
| 104 | u_int *addr_len, u_int8_t *flags) |
| 105 | { |
| 106 | if ((p[0] & FR_EA_BIT)) |
| 107 | return -1; |
| 108 | |
| 109 | *addr_len = 2; |
| 110 | *dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4); |
| 111 | |
| 112 | flags[0] = p[0] & 0x02; /* populate the first flag fields */ |
| 113 | flags[1] = p[1] & 0x0c; |
| 114 | flags[2] = 0; /* clear the rest of the flags */ |
| 115 | flags[3] = 0; |
| 116 | |
| 117 | if (p[1] & FR_EA_BIT) |
| 118 | return 0; /* 2-byte Q.922 address */ |
| 119 | |
| 120 | p += 2; |
| 121 | (*addr_len)++; /* 3- or 4-byte Q.922 address */ |
| 122 | if ((p[0] & FR_EA_BIT) == 0) { |
| 123 | *dlci = (*dlci << 7) | (p[0] >> 1); |
| 124 | (*addr_len)++; /* 4-byte Q.922 address */ |
| 125 | p++; |
| 126 | } |
| 127 | |
| 128 | if ((p[0] & FR_EA_BIT) == 0) |
| 129 | return -1; /* more than 4 bytes of Q.922 address? */ |
| 130 | |
| 131 | flags[3] = p[0] & 0x02; |
| 132 | |
| 133 | if (p[0] & 0x02) |
| 134 | *sdlcore = p[0] >> 2; |
| 135 | else |
| 136 | *dlci = (*dlci << 6) | (p[0] >> 2); |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /* Frame Relay packet structure, with flags and CRC removed |
| 142 | |
| 143 | +---------------------------+ |
| 144 | | Q.922 Address* | |
| 145 | +-- --+ |
| 146 | | | |
| 147 | +---------------------------+ |
| 148 | | Control (UI = 0x03) | |
| 149 | +---------------------------+ |
| 150 | | Optional Pad (0x00) | |
| 151 | +---------------------------+ |
| 152 | | NLPID | |
| 153 | +---------------------------+ |
| 154 | | . | |
| 155 | | . | |
| 156 | | . | |
| 157 | | Data | |
| 158 | | . | |
| 159 | | . | |
| 160 | +---------------------------+ |
| 161 | |
| 162 | * Q.922 addresses, as presently defined, are two octets and |
| 163 | contain a 10-bit DLCI. In some networks Q.922 addresses |
| 164 | may optionally be increased to three or four octets. |
| 165 | */ |
| 166 | |
| 167 | static u_int |
| 168 | fr_hdrlen(const u_char *p, u_int addr_len) |
| 169 | { |
| 170 | if (!p[addr_len + 1] /* pad exist */) |
| 171 | return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */; |
| 172 | else |
| 173 | return addr_len + 1 /* UI */ + 1 /* NLPID */; |
| 174 | } |
| 175 | |
| 176 | static void |
| 177 | fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid) |
| 178 | { |
| 179 | if (qflag) { |
| 180 | (void)printf("Q.922, DLCI %u, length %u: ", |
| 181 | dlci, |
| 182 | length); |
| 183 | } else { |
| 184 | if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */ |
| 185 | (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ", |
| 186 | addr_len, |
| 187 | dlci, |
| 188 | bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)), |
| 189 | tok2str(nlpid_values,"unknown", nlpid), |
| 190 | nlpid, |
| 191 | length); |
| 192 | else /* must be an ethertype */ |
| 193 | (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ", |
| 194 | addr_len, |
| 195 | dlci, |
| 196 | bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)), |
| 197 | tok2str(ethertype_values, "unknown", nlpid), |
| 198 | nlpid, |
| 199 | length); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | u_int |
| 204 | fr_if_print(const struct pcap_pkthdr *h, register const u_char *p) |
| 205 | { |
| 206 | register u_int length = h->len; |
| 207 | register u_int caplen = h->caplen; |
| 208 | |
| 209 | TCHECK2(*p, 4); /* minimum frame header length */ |
| 210 | |
| 211 | if ((length = fr_print(p, length)) == 0) |
| 212 | return (0); |
| 213 | else |
| 214 | return length; |
| 215 | trunc: |
| 216 | printf("[|fr]"); |
| 217 | return caplen; |
| 218 | } |
| 219 | |
| 220 | u_int |
| 221 | fr_print(register const u_char *p, u_int length) |
| 222 | { |
| 223 | u_int16_t extracted_ethertype; |
| 224 | u_int dlci; |
| 225 | u_int sdlcore; |
| 226 | u_int addr_len; |
| 227 | u_int16_t nlpid; |
| 228 | u_int hdr_len; |
| 229 | u_int8_t flags[4]; |
| 230 | |
| 231 | if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) { |
| 232 | printf("Q.922, invalid address"); |
| 233 | return 0; |
| 234 | } |
| 235 | |
| 236 | TCHECK2(*p,addr_len+1+1); |
| 237 | hdr_len = fr_hdrlen(p, addr_len); |
| 238 | TCHECK2(*p,hdr_len); |
| 239 | |
| 240 | if (p[addr_len] != 0x03 && dlci != 0) { |
| 241 | |
| 242 | /* lets figure out if we have cisco style encapsulation: */ |
| 243 | extracted_ethertype = EXTRACT_16BITS(p+addr_len); |
| 244 | |
| 245 | if (eflag) |
| 246 | fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype); |
| 247 | |
| 248 | if (ether_encap_print(extracted_ethertype, |
| 249 | p+addr_len+ETHERTYPE_LEN, |
| 250 | length-addr_len-ETHERTYPE_LEN, |
| 251 | length-addr_len-ETHERTYPE_LEN, |
| 252 | &extracted_ethertype) == 0) |
| 253 | /* ether_type not known, probably it wasn't one */ |
| 254 | printf("UI %02x! ", p[addr_len]); |
| 255 | else |
| 256 | return hdr_len; |
| 257 | } |
| 258 | |
| 259 | if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */ |
| 260 | if (addr_len != 3) |
| 261 | printf("Pad! "); |
| 262 | } else if (addr_len == 3) |
| 263 | printf("No pad! "); |
| 264 | |
| 265 | nlpid = p[hdr_len - 1]; |
| 266 | |
| 267 | if (eflag) |
| 268 | fr_hdr_print(length, addr_len, dlci, flags, nlpid); |
| 269 | p += hdr_len; |
| 270 | length -= hdr_len; |
| 271 | |
| 272 | switch (nlpid) { |
| 273 | case NLPID_IP: |
| 274 | ip_print(gndo, p, length); |
| 275 | break; |
| 276 | |
| 277 | #ifdef INET6 |
| 278 | case NLPID_IP6: |
| 279 | ip6_print(p, length); |
| 280 | break; |
| 281 | #endif |
| 282 | case NLPID_CLNP: |
| 283 | case NLPID_ESIS: |
| 284 | case NLPID_ISIS: |
| 285 | isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */ |
| 286 | break; |
| 287 | |
| 288 | case NLPID_SNAP: |
| 289 | if (snap_print(p, length, length, &extracted_ethertype, 0) == 0) { |
| 290 | /* ether_type not known, print raw packet */ |
| 291 | if (!eflag) |
| 292 | fr_hdr_print(length + hdr_len, hdr_len, |
| 293 | dlci, flags, nlpid); |
| 294 | if (!suppress_default_print) |
| 295 | default_print(p - hdr_len, length + hdr_len); |
| 296 | } |
| 297 | break; |
| 298 | |
| 299 | case NLPID_Q933: |
| 300 | q933_print(p, length); |
| 301 | break; |
| 302 | |
| 303 | case NLPID_MFR: |
| 304 | frf15_print(p, length); |
| 305 | break; |
| 306 | |
| 307 | case NLPID_PPP: |
| 308 | ppp_print(p, length); |
| 309 | break; |
| 310 | |
| 311 | default: |
| 312 | if (!eflag) |
| 313 | fr_hdr_print(length + hdr_len, addr_len, |
| 314 | dlci, flags, nlpid); |
| 315 | if (!xflag) |
| 316 | default_print(p, length); |
| 317 | } |
| 318 | |
| 319 | return hdr_len; |
| 320 | |
| 321 | trunc: |
| 322 | printf("[|fr]"); |
| 323 | return 0; |
| 324 | |
| 325 | } |
| 326 | |
| 327 | u_int |
| 328 | mfr_if_print(const struct pcap_pkthdr *h, register const u_char *p) |
| 329 | { |
| 330 | register u_int length = h->len; |
| 331 | register u_int caplen = h->caplen; |
| 332 | |
| 333 | TCHECK2(*p, 2); /* minimum frame header length */ |
| 334 | |
| 335 | if ((length = mfr_print(p, length)) == 0) |
| 336 | return (0); |
| 337 | else |
| 338 | return length; |
| 339 | trunc: |
| 340 | printf("[|mfr]"); |
| 341 | return caplen; |
| 342 | } |
| 343 | |
| 344 | |
| 345 | #define MFR_CTRL_MSG_ADD_LINK 1 |
| 346 | #define MFR_CTRL_MSG_ADD_LINK_ACK 2 |
| 347 | #define MFR_CTRL_MSG_ADD_LINK_REJ 3 |
| 348 | #define MFR_CTRL_MSG_HELLO 4 |
| 349 | #define MFR_CTRL_MSG_HELLO_ACK 5 |
| 350 | #define MFR_CTRL_MSG_REMOVE_LINK 6 |
| 351 | #define MFR_CTRL_MSG_REMOVE_LINK_ACK 7 |
| 352 | |
| 353 | struct tok mfr_ctrl_msg_values[] = { |
| 354 | { MFR_CTRL_MSG_ADD_LINK, "Add Link" }, |
| 355 | { MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" }, |
| 356 | { MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" }, |
| 357 | { MFR_CTRL_MSG_HELLO, "Hello" }, |
| 358 | { MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" }, |
| 359 | { MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" }, |
| 360 | { MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" }, |
| 361 | { 0, NULL } |
| 362 | }; |
| 363 | |
| 364 | #define MFR_CTRL_IE_BUNDLE_ID 1 |
| 365 | #define MFR_CTRL_IE_LINK_ID 2 |
| 366 | #define MFR_CTRL_IE_MAGIC_NUM 3 |
| 367 | #define MFR_CTRL_IE_TIMESTAMP 5 |
| 368 | #define MFR_CTRL_IE_VENDOR_EXT 6 |
| 369 | #define MFR_CTRL_IE_CAUSE 7 |
| 370 | |
| 371 | struct tok mfr_ctrl_ie_values[] = { |
| 372 | { MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"}, |
| 373 | { MFR_CTRL_IE_LINK_ID, "Link ID"}, |
| 374 | { MFR_CTRL_IE_MAGIC_NUM, "Magic Number"}, |
| 375 | { MFR_CTRL_IE_TIMESTAMP, "Timestamp"}, |
| 376 | { MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"}, |
| 377 | { MFR_CTRL_IE_CAUSE, "Cause"}, |
| 378 | { 0, NULL } |
| 379 | }; |
| 380 | |
| 381 | #define MFR_ID_STRING_MAXLEN 50 |
| 382 | |
| 383 | struct ie_tlv_header_t { |
| 384 | u_int8_t ie_type; |
| 385 | u_int8_t ie_len; |
| 386 | }; |
| 387 | |
| 388 | u_int |
| 389 | mfr_print(register const u_char *p, u_int length) |
| 390 | { |
| 391 | u_int tlen,idx,hdr_len = 0; |
| 392 | u_int16_t sequence_num; |
| 393 | u_int8_t ie_type,ie_len; |
| 394 | const u_int8_t *tptr; |
| 395 | |
| 396 | |
| 397 | /* |
| 398 | * FRF.16 Link Integrity Control Frame |
| 399 | * |
| 400 | * 7 6 5 4 3 2 1 0 |
| 401 | * +----+----+----+----+----+----+----+----+ |
| 402 | * | B | E | C=1| 0 0 0 0 | EA | |
| 403 | * +----+----+----+----+----+----+----+----+ |
| 404 | * | 0 0 0 0 0 0 0 0 | |
| 405 | * +----+----+----+----+----+----+----+----+ |
| 406 | * | message type | |
| 407 | * +----+----+----+----+----+----+----+----+ |
| 408 | */ |
| 409 | |
| 410 | TCHECK2(*p, 4); /* minimum frame header length */ |
| 411 | |
| 412 | if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) { |
| 413 | printf("FRF.16 Control, Flags [%s], %s, length %u", |
| 414 | bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)), |
| 415 | tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]), |
| 416 | length); |
| 417 | tptr = p + 3; |
| 418 | tlen = length -3; |
| 419 | hdr_len = 3; |
| 420 | |
| 421 | if (!vflag) |
| 422 | return hdr_len; |
| 423 | |
| 424 | while (tlen>sizeof(struct ie_tlv_header_t)) { |
| 425 | TCHECK2(*tptr, sizeof(struct ie_tlv_header_t)); |
| 426 | ie_type=tptr[0]; |
| 427 | ie_len=tptr[1]; |
| 428 | |
| 429 | printf("\n\tIE %s (%u), length %u: ", |
| 430 | tok2str(mfr_ctrl_ie_values,"Unknown",ie_type), |
| 431 | ie_type, |
| 432 | ie_len); |
| 433 | |
| 434 | /* infinite loop check */ |
| 435 | if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t)) |
| 436 | return hdr_len; |
| 437 | |
| 438 | TCHECK2(*tptr,ie_len); |
| 439 | tptr+=sizeof(struct ie_tlv_header_t); |
| 440 | /* tlv len includes header */ |
| 441 | ie_len-=sizeof(struct ie_tlv_header_t); |
| 442 | tlen-=sizeof(struct ie_tlv_header_t); |
| 443 | |
| 444 | switch (ie_type) { |
| 445 | |
| 446 | case MFR_CTRL_IE_MAGIC_NUM: |
| 447 | printf("0x%08x",EXTRACT_32BITS(tptr)); |
| 448 | break; |
| 449 | |
| 450 | case MFR_CTRL_IE_BUNDLE_ID: /* same message format */ |
| 451 | case MFR_CTRL_IE_LINK_ID: |
| 452 | for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) { |
| 453 | if (*(tptr+idx) != 0) /* don't print null termination */ |
| 454 | safeputchar(*(tptr+idx)); |
| 455 | else |
| 456 | break; |
| 457 | } |
| 458 | break; |
| 459 | |
| 460 | case MFR_CTRL_IE_TIMESTAMP: |
| 461 | if (ie_len == sizeof(struct timeval)) { |
| 462 | ts_print((const struct timeval *)tptr); |
| 463 | break; |
| 464 | } |
| 465 | /* fall through and hexdump if no unix timestamp */ |
| 466 | |
| 467 | /* |
| 468 | * FIXME those are the defined IEs that lack a decoder |
| 469 | * you are welcome to contribute code ;-) |
| 470 | */ |
| 471 | |
| 472 | case MFR_CTRL_IE_VENDOR_EXT: |
| 473 | case MFR_CTRL_IE_CAUSE: |
| 474 | |
| 475 | default: |
| 476 | if (vflag <= 1) |
| 477 | print_unknown_data(tptr,"\n\t ",ie_len); |
| 478 | break; |
| 479 | } |
| 480 | |
| 481 | /* do we want to see a hexdump of the IE ? */ |
| 482 | if (vflag > 1 ) |
| 483 | print_unknown_data(tptr,"\n\t ",ie_len); |
| 484 | |
| 485 | tlen-=ie_len; |
| 486 | tptr+=ie_len; |
| 487 | } |
| 488 | return hdr_len; |
| 489 | } |
| 490 | /* |
| 491 | * FRF.16 Fragmentation Frame |
| 492 | * |
| 493 | * 7 6 5 4 3 2 1 0 |
| 494 | * +----+----+----+----+----+----+----+----+ |
| 495 | * | B | E | C=0|seq. (high 4 bits) | EA | |
| 496 | * +----+----+----+----+----+----+----+----+ |
| 497 | * | sequence (low 8 bits) | |
| 498 | * +----+----+----+----+----+----+----+----+ |
| 499 | * | DLCI (6 bits) | CR | EA | |
| 500 | * +----+----+----+----+----+----+----+----+ |
| 501 | * | DLCI (4 bits) |FECN|BECN| DE | EA | |
| 502 | * +----+----+----+----+----+----+----+----+ |
| 503 | */ |
| 504 | |
| 505 | sequence_num = (p[0]&0x1e)<<7 | p[1]; |
| 506 | /* whole packet or first fragment ? */ |
| 507 | if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME || |
| 508 | (p[0] & MFR_BEC_MASK) == MFR_B_BIT) { |
| 509 | printf("FRF.16 Frag, seq %u, Flags [%s], ", |
| 510 | sequence_num, |
| 511 | bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); |
| 512 | hdr_len = 2; |
| 513 | fr_print(p+hdr_len,length-hdr_len); |
| 514 | return hdr_len; |
| 515 | } |
| 516 | |
| 517 | /* must be a middle or the last fragment */ |
| 518 | printf("FRF.16 Frag, seq %u, Flags [%s]", |
| 519 | sequence_num, |
| 520 | bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))); |
| 521 | print_unknown_data(p,"\n\t",length); |
| 522 | |
| 523 | return hdr_len; |
| 524 | |
| 525 | trunc: |
| 526 | printf("[|mfr]"); |
| 527 | return length; |
| 528 | } |
| 529 | |
| 530 | /* an NLPID of 0xb1 indicates a 2-byte |
| 531 | * FRF.15 header |
| 532 | * |
| 533 | * 7 6 5 4 3 2 1 0 |
| 534 | * +----+----+----+----+----+----+----+----+ |
| 535 | * ~ Q.922 header ~ |
| 536 | * +----+----+----+----+----+----+----+----+ |
| 537 | * | NLPID (8 bits) | NLPID=0xb1 |
| 538 | * +----+----+----+----+----+----+----+----+ |
| 539 | * | B | E | C |seq. (high 4 bits) | R | |
| 540 | * +----+----+----+----+----+----+----+----+ |
| 541 | * | sequence (low 8 bits) | |
| 542 | * +----+----+----+----+----+----+----+----+ |
| 543 | */ |
| 544 | |
| 545 | #define FR_FRF15_FRAGTYPE 0x01 |
| 546 | |
| 547 | static void |
| 548 | frf15_print (const u_char *p, u_int length) { |
| 549 | |
| 550 | u_int16_t sequence_num, flags; |
| 551 | |
| 552 | flags = p[0]&MFR_BEC_MASK; |
| 553 | sequence_num = (p[0]&0x1e)<<7 | p[1]; |
| 554 | |
| 555 | printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u", |
| 556 | sequence_num, |
| 557 | bittok2str(frf_flag_values,"none",flags), |
| 558 | p[0]&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End", |
| 559 | length); |
| 560 | |
| 561 | /* TODO: |
| 562 | * depending on all permutations of the B, E and C bit |
| 563 | * dig as deep as we can - e.g. on the first (B) fragment |
| 564 | * there is enough payload to print the IP header |
| 565 | * on non (B) fragments it depends if the fragmentation |
| 566 | * model is end-to-end or interface based wether we want to print |
| 567 | * another Q.922 header |
| 568 | */ |
| 569 | |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Q.933 decoding portion for framerelay specific. |
| 574 | */ |
| 575 | |
| 576 | /* Q.933 packet format |
| 577 | Format of Other Protocols |
| 578 | using Q.933 NLPID |
| 579 | +-------------------------------+ |
| 580 | | Q.922 Address | |
| 581 | +---------------+---------------+ |
| 582 | |Control 0x03 | NLPID 0x08 | |
| 583 | +---------------+---------------+ |
| 584 | | L2 Protocol ID | |
| 585 | | octet 1 | octet 2 | |
| 586 | +-------------------------------+ |
| 587 | | L3 Protocol ID | |
| 588 | | octet 2 | octet 2 | |
| 589 | +-------------------------------+ |
| 590 | | Protocol Data | |
| 591 | +-------------------------------+ |
| 592 | | FCS | |
| 593 | +-------------------------------+ |
| 594 | */ |
| 595 | |
| 596 | /* L2 (Octet 1)- Call Reference Usually is 0x0 */ |
| 597 | |
| 598 | /* |
| 599 | * L2 (Octet 2)- Message Types definition 1 byte long. |
| 600 | */ |
| 601 | /* Call Establish */ |
| 602 | #define MSG_TYPE_ESC_TO_NATIONAL 0x00 |
| 603 | #define MSG_TYPE_ALERT 0x01 |
| 604 | #define MSG_TYPE_CALL_PROCEEDING 0x02 |
| 605 | #define MSG_TYPE_CONNECT 0x07 |
| 606 | #define MSG_TYPE_CONNECT_ACK 0x0F |
| 607 | #define MSG_TYPE_PROGRESS 0x03 |
| 608 | #define MSG_TYPE_SETUP 0x05 |
| 609 | /* Call Clear */ |
| 610 | #define MSG_TYPE_DISCONNECT 0x45 |
| 611 | #define MSG_TYPE_RELEASE 0x4D |
| 612 | #define MSG_TYPE_RELEASE_COMPLETE 0x5A |
| 613 | #define MSG_TYPE_RESTART 0x46 |
| 614 | #define MSG_TYPE_RESTART_ACK 0x4E |
| 615 | /* Status */ |
| 616 | #define MSG_TYPE_STATUS 0x7D |
| 617 | #define MSG_TYPE_STATUS_ENQ 0x75 |
| 618 | |
| 619 | struct tok fr_q933_msg_values[] = { |
| 620 | { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" }, |
| 621 | { MSG_TYPE_ALERT, "Alert" }, |
| 622 | { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" }, |
| 623 | { MSG_TYPE_CONNECT, "Connect" }, |
| 624 | { MSG_TYPE_CONNECT_ACK, "Connect ACK" }, |
| 625 | { MSG_TYPE_PROGRESS, "Progress" }, |
| 626 | { MSG_TYPE_SETUP, "Setup" }, |
| 627 | { MSG_TYPE_DISCONNECT, "Disconnect" }, |
| 628 | { MSG_TYPE_RELEASE, "Release" }, |
| 629 | { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" }, |
| 630 | { MSG_TYPE_RESTART, "Restart" }, |
| 631 | { MSG_TYPE_RESTART_ACK, "Restart ACK" }, |
| 632 | { MSG_TYPE_STATUS, "Status Reply" }, |
| 633 | { MSG_TYPE_STATUS_ENQ, "Status Enquiry" }, |
| 634 | { 0, NULL } |
| 635 | }; |
| 636 | |
| 637 | #define MSG_ANSI_LOCKING_SHIFT 0x95 |
| 638 | |
| 639 | #define FR_LMI_ANSI_REPORT_TYPE_IE 0x01 |
| 640 | #define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */ |
| 641 | #define FR_LMI_ANSI_LINK_VERIFY_IE 0x03 |
| 642 | #define FR_LMI_ANSI_PVC_STATUS_IE 0x07 |
| 643 | |
| 644 | #define FR_LMI_CCITT_REPORT_TYPE_IE 0x51 |
| 645 | #define FR_LMI_CCITT_LINK_VERIFY_IE 0x53 |
| 646 | #define FR_LMI_CCITT_PVC_STATUS_IE 0x57 |
| 647 | |
| 648 | struct tok fr_q933_ie_values_codeset5[] = { |
| 649 | { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" }, |
| 650 | { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" }, |
| 651 | { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" }, |
| 652 | { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" }, |
| 653 | { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" }, |
| 654 | { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" }, |
| 655 | { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" }, |
| 656 | { 0, NULL } |
| 657 | }; |
| 658 | |
| 659 | #define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0 |
| 660 | #define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1 |
| 661 | #define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2 |
| 662 | |
| 663 | struct tok fr_lmi_report_type_ie_values[] = { |
| 664 | { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" }, |
| 665 | { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" }, |
| 666 | { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" }, |
| 667 | { 0, NULL } |
| 668 | }; |
| 669 | |
| 670 | /* array of 16 codepages - currently we only support codepage 1,5 */ |
| 671 | static struct tok *fr_q933_ie_codesets[] = { |
| 672 | NULL, |
| 673 | fr_q933_ie_values_codeset5, |
| 674 | NULL, |
| 675 | NULL, |
| 676 | NULL, |
| 677 | fr_q933_ie_values_codeset5, |
| 678 | NULL, |
| 679 | NULL, |
| 680 | NULL, |
| 681 | NULL, |
| 682 | NULL, |
| 683 | NULL, |
| 684 | NULL, |
| 685 | NULL, |
| 686 | NULL, |
| 687 | NULL |
| 688 | }; |
| 689 | |
| 690 | static int fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, |
| 691 | const u_char *p); |
| 692 | |
| 693 | typedef int (*codeset_pr_func_t)(const struct ie_tlv_header_t *ie_p, |
| 694 | const u_char *p); |
| 695 | |
| 696 | /* array of 16 codepages - currently we only support codepage 1,5 */ |
| 697 | static codeset_pr_func_t fr_q933_print_ie_codeset[] = { |
| 698 | NULL, |
| 699 | fr_q933_print_ie_codeset5, |
| 700 | NULL, |
| 701 | NULL, |
| 702 | NULL, |
| 703 | fr_q933_print_ie_codeset5, |
| 704 | NULL, |
| 705 | NULL, |
| 706 | NULL, |
| 707 | NULL, |
| 708 | NULL, |
| 709 | NULL, |
| 710 | NULL, |
| 711 | NULL, |
| 712 | NULL, |
| 713 | NULL |
| 714 | }; |
| 715 | |
| 716 | void |
| 717 | q933_print(const u_char *p, u_int length) |
| 718 | { |
| 719 | const u_char *ptemp = p; |
| 720 | struct ie_tlv_header_t *ie_p; |
| 721 | int olen; |
| 722 | int is_ansi = 0; |
| 723 | u_int codeset; |
| 724 | u_int ie_is_known = 0; |
| 725 | |
| 726 | if (length < 9) { /* shortest: Q.933a LINK VERIFY */ |
| 727 | printf("[|q.933]"); |
| 728 | return; |
| 729 | } |
| 730 | |
| 731 | codeset = p[2]&0x0f; /* extract the codeset */ |
| 732 | |
| 733 | if (p[2] == MSG_ANSI_LOCKING_SHIFT) |
| 734 | is_ansi = 1; |
| 735 | |
| 736 | printf("%s", eflag ? "" : "Q.933, "); |
| 737 | |
| 738 | /* printing out header part */ |
| 739 | printf("%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset); |
| 740 | |
| 741 | if (p[0]) |
| 742 | printf(", Call Ref: 0x%02x", p[0]); |
| 743 | |
| 744 | if (vflag) |
| 745 | printf(", %s (0x%02x), length %u", |
| 746 | tok2str(fr_q933_msg_values,"unknown message",p[1]), |
| 747 | p[1], |
| 748 | length); |
| 749 | else |
| 750 | printf(", %s", |
| 751 | tok2str(fr_q933_msg_values,"unknown message 0x%02x",p[1])); |
| 752 | |
| 753 | olen = length; /* preserve the original length for non verbose mode */ |
| 754 | |
| 755 | if (length < (u_int)(2 - is_ansi)) { |
| 756 | printf("[|q.933]"); |
| 757 | return; |
| 758 | } |
| 759 | length -= 2 - is_ansi; |
| 760 | ptemp += 2 + is_ansi; |
| 761 | |
| 762 | /* Loop through the rest of IE */ |
| 763 | while (length > sizeof(struct ie_tlv_header_t )) { |
| 764 | ie_p = (struct ie_tlv_header_t *)ptemp; |
| 765 | if (length < sizeof(struct ie_tlv_header_t ) || |
| 766 | length < sizeof(struct ie_tlv_header_t ) + ie_p->ie_len) { |
| 767 | if (vflag) /* not bark if there is just a trailer */ |
| 768 | printf("\n[|q.933]"); |
| 769 | else |
| 770 | printf(", length %u",olen); |
| 771 | return; |
| 772 | } |
| 773 | |
| 774 | /* lets do the full IE parsing only in verbose mode |
| 775 | * however some IEs (DLCI Status, Link Verify) |
| 776 | * are also intereststing in non-verbose mode */ |
| 777 | if (vflag) |
| 778 | printf("\n\t%s IE (0x%02x), length %u: ", |
| 779 | tok2str(fr_q933_ie_codesets[codeset],"unknown",ie_p->ie_type), |
| 780 | ie_p->ie_type, |
| 781 | ie_p->ie_len); |
| 782 | |
| 783 | /* sanity check */ |
| 784 | if (ie_p->ie_type == 0 || ie_p->ie_len == 0) |
| 785 | return; |
| 786 | |
| 787 | if (fr_q933_print_ie_codeset[codeset] != NULL) |
| 788 | ie_is_known = fr_q933_print_ie_codeset[codeset](ie_p, ptemp); |
| 789 | |
| 790 | if (vflag >= 1 && !ie_is_known) |
| 791 | print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len); |
| 792 | |
| 793 | /* do we want to see a hexdump of the IE ? */ |
| 794 | if (vflag> 1 && ie_is_known) |
| 795 | print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len); |
| 796 | |
| 797 | length = length - ie_p->ie_len - 2; |
| 798 | ptemp = ptemp + ie_p->ie_len + 2; |
| 799 | } |
| 800 | if (!vflag) |
| 801 | printf(", length %u",olen); |
| 802 | } |
| 803 | |
| 804 | static int |
| 805 | fr_q933_print_ie_codeset5(const struct ie_tlv_header_t *ie_p, const u_char *p) |
| 806 | { |
| 807 | u_int dlci; |
| 808 | |
| 809 | switch (ie_p->ie_type) { |
| 810 | |
| 811 | case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */ |
| 812 | case FR_LMI_CCITT_REPORT_TYPE_IE: |
| 813 | if (vflag) |
| 814 | printf("%s (%u)", |
| 815 | tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]), |
| 816 | p[2]); |
| 817 | return 1; |
| 818 | |
| 819 | case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */ |
| 820 | case FR_LMI_CCITT_LINK_VERIFY_IE: |
| 821 | case FR_LMI_ANSI_LINK_VERIFY_IE_91: |
| 822 | if (!vflag) |
| 823 | printf(", "); |
| 824 | printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]); |
| 825 | return 1; |
| 826 | |
| 827 | case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */ |
| 828 | case FR_LMI_CCITT_PVC_STATUS_IE: |
| 829 | if (!vflag) |
| 830 | printf(", "); |
| 831 | /* now parse the DLCI information element. */ |
| 832 | if ((ie_p->ie_len < 3) || |
| 833 | (p[2] & 0x80) || |
| 834 | ((ie_p->ie_len == 3) && !(p[3] & 0x80)) || |
| 835 | ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) || |
| 836 | ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) || |
| 837 | !(p[5] & 0x80))) || |
| 838 | (ie_p->ie_len > 5) || |
| 839 | !(p[ie_p->ie_len + 1] & 0x80)) |
| 840 | printf("Invalid DLCI IE"); |
| 841 | |
| 842 | dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3); |
| 843 | if (ie_p->ie_len == 4) |
| 844 | dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1); |
| 845 | else if (ie_p->ie_len == 5) |
| 846 | dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1); |
| 847 | |
| 848 | printf("DLCI %u: status %s%s", dlci, |
| 849 | p[ie_p->ie_len + 1] & 0x8 ? "New, " : "", |
| 850 | p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive"); |
| 851 | return 1; |
| 852 | } |
| 853 | |
| 854 | return 0; |
| 855 | } |