Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

file 641 lines (543 sloc) 19.543 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
static const char rcsid[] _U_ =
"@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.32.2.5 2005-07-07 01:24:35 guy Exp $ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <tcpdump-stdinc.h>

#include <stdio.h>
#include <string.h>
#include <pcap.h>

#include "addrtoname.h"
#include "interface.h"
#include "ethertype.h"
#include "nlpid.h"
#include "extract.h"
#include "oui.h"

static void frf15_print(const u_char *, u_int);

/*
* the frame relay header has a variable length
*
* the EA bit determines if there is another byte
* in the header
*
* minimum header length is 2 bytes
* maximum header length is 4 bytes
*
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
* | DLCI (6 bits) | CR | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (4 bits) |FECN|BECN| DE | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (7 bits) | EA |
* +----+----+----+----+----+----+----+----+
* | DLCI (6 bits) |SDLC| EA |
* +----+----+----+----+----+----+----+----+
*/

#define FR_EA_BIT 0x01

#define FR_CR_BIT 0x02000000
#define FR_DE_BIT 0x00020000
#define FR_BECN_BIT 0x00040000
#define FR_FECN_BIT 0x00080000
#define FR_SDLC_BIT 0x00000002


struct tok fr_header_flag_values[] = {
    { FR_CR_BIT, "C!" },
    { FR_DE_BIT, "DE" },
    { FR_BECN_BIT, "BECN" },
    { FR_FECN_BIT, "FECN" },
    { FR_SDLC_BIT, "sdlcore" },
    { 0, NULL }
};


/* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
* save the flags dep. on address length
*/
static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore,
                           u_int *addr_len, u_int8_t *flags)
{
if ((p[0] & FR_EA_BIT))
return -1;

*addr_len = 2;
*dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);

        flags[0] = p[0] & 0x02; /* populate the first flag fields */
        flags[1] = p[1] & 0x0c;

if (p[1] & FR_EA_BIT)
return 0; /* 2-byte Q.922 address */

p += 2;
(*addr_len)++; /* 3- or 4-byte Q.922 address */
if ((p[0] & FR_EA_BIT) == 0) {
*dlci = (*dlci << 7) | (p[0] >> 1);
(*addr_len)++; /* 4-byte Q.922 address */
p++;
}

if ((p[0] & FR_EA_BIT) == 0)
return -1; /* more than 4 bytes of Q.922 address? */

        flags[3] = p[0] & 0x02;

if (p[0] & 0x02)
                *sdlcore = p[0] >> 2;
else
*dlci = (*dlci << 6) | (p[0] >> 2);

return 0;
}

/* Frame Relay packet structure, with flags and CRC removed

+---------------------------+
| Q.922 Address* |
+-- --+
| |
+---------------------------+
| Control (UI = 0x03) |
+---------------------------+
| Optional Pad (0x00) |
+---------------------------+
| NLPID |
+---------------------------+
| . |
| . |
| . |
| Data |
| . |
| . |
+---------------------------+

* Q.922 addresses, as presently defined, are two octets and
contain a 10-bit DLCI. In some networks Q.922 addresses
may optionally be increased to three or four octets.
*/

static u_int
fr_hdrlen(const u_char *p, u_int addr_len)
{
if (!p[addr_len + 1] /* pad exist */)
return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
else
return addr_len + 1 /* UI */ + 1 /* NLPID */;
}

static void
fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
{
    if (qflag) {
        (void)printf("Q.922, DLCI %u, length %u: ",
                     dlci,
                     length);
    } else {
        if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
            (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
                         addr_len,
                         dlci,
                         bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
                         tok2str(nlpid_values,"unknown", nlpid),
                         nlpid,
                         length);
        else /* must be an ethertype */
            (void)printf("Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
                         addr_len,
                         dlci,
                         bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
                         tok2str(ethertype_values, "unknown", nlpid),
                         nlpid,
                         length);
    }
}

u_int
fr_if_print(const struct pcap_pkthdr *h, register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;

        TCHECK2(*p, 4); /* minimum frame header length */

        if ((length = fr_print(p, length)) == 0)
            return (0);
        else
            return length;
 trunc:
        printf("[|fr]");
        return caplen;
}

u_int
fr_print(register const u_char *p, u_int length)
{
u_int16_t extracted_ethertype;
u_int dlci;
        u_int sdlcore;
u_int addr_len;
u_int16_t nlpid;
u_int hdr_len;
u_int8_t flags[4];

if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) {
printf("Q.922, invalid address");
return 0;
}

        TCHECK2(*p,addr_len+1+1);
hdr_len = fr_hdrlen(p, addr_len);
        TCHECK2(*p,hdr_len);

if (p[addr_len] != 0x03 && dlci != 0) {

                /* lets figure out if we have cisco style encapsulation: */
                extracted_ethertype = EXTRACT_16BITS(p+addr_len);

                if (eflag)
                    fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);

                if (ether_encap_print(extracted_ethertype,
                                      p+addr_len+ETHERTYPE_LEN,
                                      length-addr_len-ETHERTYPE_LEN,
                                      length-addr_len-ETHERTYPE_LEN,
                                      &extracted_ethertype) == 0)
                    /* ether_type not known, probably it wasn't one */
                    printf("UI %02x! ", p[addr_len]);
                else
                    return hdr_len;
        }

if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
if (addr_len != 3)
printf("Pad! ");
} else if (addr_len == 3)
printf("No pad! ");

nlpid = p[hdr_len - 1];

if (eflag)
fr_hdr_print(length, addr_len, dlci, flags, nlpid);

p += hdr_len;
length -= hdr_len;

switch (nlpid) {
case NLPID_IP:
ip_print(gndo, p, length);
break;

#ifdef INET6
case NLPID_IP6:
ip6_print(p, length);
break;
#endif
case NLPID_CLNP:
case NLPID_ESIS:
case NLPID_ISIS:
                isoclns_print(p-1, length+1, length+1); /* OSI printers need the NLPID field */
break;

case NLPID_SNAP:
if (snap_print(p, length, length, &extracted_ethertype, 0) == 0) {
/* ether_type not known, print raw packet */
                        if (!eflag)
                            fr_hdr_print(length + hdr_len, hdr_len,
                                         dlci, flags, nlpid);
if (!suppress_default_print)
                            default_print(p - hdr_len, length + hdr_len);
}
break;

        case NLPID_Q933:
q933_print(p, length);
break;

        case NLPID_MFR:
                frf15_print(p, length);
                break;

default:
if (!eflag)
                    fr_hdr_print(length + hdr_len, addr_len,
dlci, flags, nlpid);
if (!xflag)
default_print(p, length);
}

return hdr_len;

 trunc:
        printf("[|fr]");
        return 0;

}

/* an NLPID of 0xb1 indicates a 2-byte
* FRF.15 header
*
* 7 6 5 4 3 2 1 0
* +----+----+----+----+----+----+----+----+
* ~ Q.922 header ~
* +----+----+----+----+----+----+----+----+
* | NLPID (8 bits) | NLPID=0xb1
* +----+----+----+----+----+----+----+----+
* | B | E | C |seq. (high 4 bits) | R |
* +----+----+----+----+----+----+----+----+
* | sequence (low 8 bits) |
* +----+----+----+----+----+----+----+----+
*/

struct tok frf15_flag_values[] = {
    { 0x80, "Begin" },
    { 0x40, "End" },
    { 0x20, "Control" },
    { 0, NULL }
};

#define FR_FRF15_FRAGTYPE 0x01

static void
frf15_print (const u_char *p, u_int length) {
    
    u_int16_t sequence_num, flags;

    flags = p[0]&0xe0;
    sequence_num = (p[0]&0x1e)<<7 | p[1];

    printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
           sequence_num,
           bittok2str(frf15_flag_values,"none",flags),
           flags&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
           length);

/* TODO:
* depending on all permutations of the B, E and C bit
* dig as deep as we can - e.g. on the first (B) fragment
* there is enough payload to print the IP header
* on non (B) fragments it depends if the fragmentation
* model is end-to-end or interface based wether we want to print
* another Q.922 header
*/

}

/*
* Q.933 decoding portion for framerelay specific.
*/

/* Q.933 packet format
Format of Other Protocols
using Q.933 NLPID
+-------------------------------+
| Q.922 Address |
+---------------+---------------+
|Control 0x03 | NLPID 0x08 |
+---------------+---------------+
| L2 Protocol ID |
| octet 1 | octet 2 |
+-------------------------------+
| L3 Protocol ID |
| octet 2 | octet 2 |
+-------------------------------+
| Protocol Data |
+-------------------------------+
| FCS |
+-------------------------------+
*/

/* L2 (Octet 1)- Call Reference Usually is 0x0 */

/*
* L2 (Octet 2)- Message Types definition 1 byte long.
*/
/* Call Establish */
#define MSG_TYPE_ESC_TO_NATIONAL 0x00
#define MSG_TYPE_ALERT 0x01
#define MSG_TYPE_CALL_PROCEEDING 0x02
#define MSG_TYPE_CONNECT 0x07
#define MSG_TYPE_CONNECT_ACK 0x0F
#define MSG_TYPE_PROGRESS 0x03
#define MSG_TYPE_SETUP 0x05
/* Call Clear */
#define MSG_TYPE_DISCONNECT 0x45
#define MSG_TYPE_RELEASE 0x4D
#define MSG_TYPE_RELEASE_COMPLETE 0x5A
#define MSG_TYPE_RESTART 0x46
#define MSG_TYPE_RESTART_ACK 0x4E
/* Status */
#define MSG_TYPE_STATUS 0x7D
#define MSG_TYPE_STATUS_ENQ 0x75

struct tok fr_q933_msg_values[] = {
    { MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
    { MSG_TYPE_ALERT, "Alert" },
    { MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
    { MSG_TYPE_CONNECT, "Connect" },
    { MSG_TYPE_CONNECT_ACK, "Connect ACK" },
    { MSG_TYPE_PROGRESS, "Progress" },
    { MSG_TYPE_SETUP, "Setup" },
    { MSG_TYPE_DISCONNECT, "Disconnect" },
    { MSG_TYPE_RELEASE, "Release" },
    { MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
    { MSG_TYPE_RESTART, "Restart" },
    { MSG_TYPE_RESTART_ACK, "Restart ACK" },
    { MSG_TYPE_STATUS, "Status Reply" },
    { MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
    { 0, NULL }
};

#define MSG_ANSI_LOCKING_SHIFT 0x95

#define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
#define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
#define FR_LMI_ANSI_LINK_VERIFY_IE 0x03
#define FR_LMI_ANSI_PVC_STATUS_IE 0x07

#define FR_LMI_CCITT_REPORT_TYPE_IE 0x51
#define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
#define FR_LMI_CCITT_PVC_STATUS_IE 0x57

struct tok fr_q933_ie_values_codeset5[] = {
    { FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
    { FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
    { FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
    { FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
    { FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
    { FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
    { FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
    { 0, NULL }
};

#define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
#define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
#define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2

struct tok fr_lmi_report_type_ie_values[] = {
    { FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
    { FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
    { FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
    { 0, NULL }
};

/* array of 16 codepages - currently we only support codepage 5 */
static struct tok *fr_q933_ie_codesets[] = {
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    fr_q933_ie_values_codeset5,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL
};


struct common_ie_header {
    u_int8_t ie_id;
    u_int8_t ie_len;
};

static int fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p,
    const u_char *p);

typedef int (*codeset_pr_func_t)(const struct common_ie_header *ie_p,
    const u_char *p);

/* array of 16 codepages - currently we only support codepage 5 */
static codeset_pr_func_t fr_q933_print_ie_codeset[] = {
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    fr_q933_print_ie_codeset5,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL
};

void
q933_print(const u_char *p, u_int length)
{
const u_char *ptemp = p;
struct common_ie_header *ie_p;
        int olen;
int is_ansi = 0;
        u_int codeset;

if (length < 9) { /* shortest: Q.933a LINK VERIFY */
printf("[|q.933]");
return;
}

        codeset = p[2]&0x0f; /* extract the codeset */

if (p[2] == MSG_ANSI_LOCKING_SHIFT)
is_ansi = 1;
    
        printf("%s", eflag ? "" : "Q.933, ");

/* printing out header part */
printf(is_ansi ? "ANSI" : "CCITT");

if (p[0])
printf(", Call Ref: 0x%02x", p[0]);

        if (vflag)
            printf(", %s (0x%02x), length %u",
                   tok2str(fr_q933_msg_values,"unknown message",p[1]),
                   p[1],
                   length);
        else
            printf(", %s",
                   tok2str(fr_q933_msg_values,"unknown message 0x%02x",p[1]));

        olen = length; /* preserve the original length for non verbose mode */

if (length < (u_int)(2 - is_ansi)) {
printf("[|q.933]");
return;
}
length -= 2 - is_ansi;
ptemp += 2 + is_ansi;

/* Loop through the rest of IE */
while (length > sizeof(struct common_ie_header)) {
ie_p = (struct common_ie_header *)ptemp;
if (length < sizeof(struct common_ie_header) ||
length < sizeof(struct common_ie_header) + ie_p->ie_len) {
                    if (vflag) /* not bark if there is just a trailer */
                        printf("\n[|q.933]");
                    else
                        printf(", length %u",olen);
                    return;
}

                /* lets do the full IE parsing only in verbose mode
* however some IEs (DLCI Status, Link Verify)
* are also intereststing in non-verbose mode */
                if (vflag)
                    printf("\n\t%s IE (%u), length %u: ",
                           tok2str(fr_q933_ie_codesets[codeset],"unknown",ie_p->ie_id),
                           ie_p->ie_id,
                           ie_p->ie_len);
                    
                if (!fr_q933_print_ie_codeset[codeset] ||
                    (*fr_q933_print_ie_codeset[codeset])(ie_p, ptemp)) {
                    if (vflag <= 1)
                        print_unknown_data(ptemp+2,"\n\t",ie_p->ie_len);
                }

                /* do we want to see a hexdump of the IE ? */
                if (vflag> 1)
                    print_unknown_data(ptemp+2,"\n\t ",ie_p->ie_len);

length = length - ie_p->ie_len - 2;
ptemp = ptemp + ie_p->ie_len + 2;
}
        if (!vflag)
            printf(", length %u",olen);
}

static int
fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p, const u_char *p)
{
        u_int dlci;

        switch (ie_p->ie_id) {

        case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
        case FR_LMI_CCITT_REPORT_TYPE_IE:
            if (vflag)
                printf("%s (%u)",
                       tok2str(fr_lmi_report_type_ie_values,"unknown",p[2]),
                       p[2]);
            return 1;

        case FR_LMI_ANSI_LINK_VERIFY_IE: /* fall through */
        case FR_LMI_CCITT_LINK_VERIFY_IE:
        case FR_LMI_ANSI_LINK_VERIFY_IE_91:
            if (!vflag)
                printf(", ");
            printf("TX Seq: %3d, RX Seq: %3d", p[2], p[3]);
            return 1;

        case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
        case FR_LMI_CCITT_PVC_STATUS_IE:
            if (!vflag)
                printf(", ");
            /* now parse the DLCI information element. */
            if ((ie_p->ie_len < 3) ||
                (p[2] & 0x80) ||
                ((ie_p->ie_len == 3) && !(p[3] & 0x80)) ||
                ((ie_p->ie_len == 4) && ((p[3] & 0x80) || !(p[4] & 0x80))) ||
                ((ie_p->ie_len == 5) && ((p[3] & 0x80) || (p[4] & 0x80) ||
                                   !(p[5] & 0x80))) ||
                (ie_p->ie_len > 5) ||
                !(p[ie_p->ie_len + 1] & 0x80))
                printf("Invalid DLCI IE");
                    
            dlci = ((p[2] & 0x3F) << 4) | ((p[3] & 0x78) >> 3);
            if (ie_p->ie_len == 4)
                dlci = (dlci << 6) | ((p[4] & 0x7E) >> 1);
            else if (ie_p->ie_len == 5)
                dlci = (dlci << 13) | (p[4] & 0x7F) | ((p[5] & 0x7E) >> 1);

            printf("DLCI %u: status %s%s", dlci,
                    p[ie_p->ie_len + 1] & 0x8 ? "New, " : "",
                    p[ie_p->ie_len + 1] & 0x2 ? "Active" : "Inactive");
            return 1;
}

        return 0;
}
Something went wrong with that request. Please try again.