1152 lines
32 KiB
C
1152 lines
32 KiB
C
/*
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* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* \summary: Frame Relay printer */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <netdissect-stdinc.h>
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#include <stdio.h>
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#include <string.h>
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#include "netdissect.h"
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#include "addrtoname.h"
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#include "ethertype.h"
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#include "llc.h"
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#include "nlpid.h"
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#include "extract.h"
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#include "oui.h"
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static void frf15_print(netdissect_options *ndo, const u_char *, u_int);
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/*
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* the frame relay header has a variable length
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*
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* the EA bit determines if there is another byte
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* in the header
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*
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* minimum header length is 2 bytes
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* maximum header length is 4 bytes
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*
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* 7 6 5 4 3 2 1 0
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* +----+----+----+----+----+----+----+----+
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* | DLCI (6 bits) | CR | EA |
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* +----+----+----+----+----+----+----+----+
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* | DLCI (4 bits) |FECN|BECN| DE | EA |
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* +----+----+----+----+----+----+----+----+
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* | DLCI (7 bits) | EA |
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* +----+----+----+----+----+----+----+----+
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* | DLCI (6 bits) |SDLC| EA |
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* +----+----+----+----+----+----+----+----+
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*/
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#define FR_EA_BIT 0x01
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#define FR_CR_BIT 0x02000000
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#define FR_DE_BIT 0x00020000
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#define FR_BECN_BIT 0x00040000
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#define FR_FECN_BIT 0x00080000
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#define FR_SDLC_BIT 0x00000002
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static const struct tok fr_header_flag_values[] = {
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{ FR_CR_BIT, "C!" },
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{ FR_DE_BIT, "DE" },
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{ FR_BECN_BIT, "BECN" },
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{ FR_FECN_BIT, "FECN" },
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{ FR_SDLC_BIT, "sdlcore" },
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{ 0, NULL }
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};
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/* FRF.15 / FRF.16 */
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#define MFR_B_BIT 0x80
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#define MFR_E_BIT 0x40
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#define MFR_C_BIT 0x20
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#define MFR_BEC_MASK (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
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#define MFR_CTRL_FRAME (MFR_B_BIT | MFR_E_BIT | MFR_C_BIT)
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#define MFR_FRAG_FRAME (MFR_B_BIT | MFR_E_BIT )
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static const struct tok frf_flag_values[] = {
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{ MFR_B_BIT, "Begin" },
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{ MFR_E_BIT, "End" },
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{ MFR_C_BIT, "Control" },
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{ 0, NULL }
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};
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/* Finds out Q.922 address length, DLCI and flags. Returns 1 on success,
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* 0 on invalid address, -1 on truncated packet
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* save the flags dep. on address length
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*/
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static int parse_q922_addr(netdissect_options *ndo,
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const u_char *p, u_int *dlci,
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u_int *addr_len, uint8_t *flags, u_int length)
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{
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if (!ND_TTEST(p[0]) || length < 1)
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return -1;
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if ((p[0] & FR_EA_BIT))
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return 0;
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if (!ND_TTEST(p[1]) || length < 2)
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return -1;
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*addr_len = 2;
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*dlci = ((p[0] & 0xFC) << 2) | ((p[1] & 0xF0) >> 4);
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flags[0] = p[0] & 0x02; /* populate the first flag fields */
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flags[1] = p[1] & 0x0c;
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flags[2] = 0; /* clear the rest of the flags */
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flags[3] = 0;
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if (p[1] & FR_EA_BIT)
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return 1; /* 2-byte Q.922 address */
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p += 2;
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length -= 2;
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if (!ND_TTEST(p[0]) || length < 1)
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return -1;
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(*addr_len)++; /* 3- or 4-byte Q.922 address */
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if ((p[0] & FR_EA_BIT) == 0) {
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*dlci = (*dlci << 7) | (p[0] >> 1);
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(*addr_len)++; /* 4-byte Q.922 address */
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p++;
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length--;
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}
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if (!ND_TTEST(p[0]) || length < 1)
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return -1;
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if ((p[0] & FR_EA_BIT) == 0)
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return 0; /* more than 4 bytes of Q.922 address? */
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flags[3] = p[0] & 0x02;
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*dlci = (*dlci << 6) | (p[0] >> 2);
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return 1;
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}
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char *
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q922_string(netdissect_options *ndo, const u_char *p, u_int length)
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{
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static u_int dlci, addr_len;
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static uint8_t flags[4];
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static char buffer[sizeof("DLCI xxxxxxxxxx")];
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memset(buffer, 0, sizeof(buffer));
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if (parse_q922_addr(ndo, p, &dlci, &addr_len, flags, length) == 1){
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snprintf(buffer, sizeof(buffer), "DLCI %u", dlci);
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}
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return buffer;
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}
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/* Frame Relay packet structure, with flags and CRC removed
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+---------------------------+
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| Q.922 Address* |
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+-- --+
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| |
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+---------------------------+
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| Control (UI = 0x03) |
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+---------------------------+
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| Optional Pad (0x00) |
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+---------------------------+
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| NLPID |
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+---------------------------+
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| . |
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| . |
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| . |
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| Data |
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| . |
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| . |
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+---------------------------+
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* Q.922 addresses, as presently defined, are two octets and
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contain a 10-bit DLCI. In some networks Q.922 addresses
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may optionally be increased to three or four octets.
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*/
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static void
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fr_hdr_print(netdissect_options *ndo,
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int length, u_int addr_len, u_int dlci, uint8_t *flags, uint16_t nlpid)
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{
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if (ndo->ndo_qflag) {
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ND_PRINT((ndo, "Q.922, DLCI %u, length %u: ",
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dlci,
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length));
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} else {
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if (nlpid <= 0xff) /* if its smaller than 256 then its a NLPID */
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ND_PRINT((ndo, "Q.922, hdr-len %u, DLCI %u, Flags [%s], NLPID %s (0x%02x), length %u: ",
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addr_len,
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dlci,
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bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
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tok2str(nlpid_values,"unknown", nlpid),
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nlpid,
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length));
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else /* must be an ethertype */
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ND_PRINT((ndo, "Q.922, hdr-len %u, DLCI %u, Flags [%s], cisco-ethertype %s (0x%04x), length %u: ",
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addr_len,
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dlci,
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bittok2str(fr_header_flag_values, "none", EXTRACT_32BITS(flags)),
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tok2str(ethertype_values, "unknown", nlpid),
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nlpid,
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length));
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}
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}
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u_int
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fr_if_print(netdissect_options *ndo,
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const struct pcap_pkthdr *h, register const u_char *p)
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{
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register u_int length = h->len;
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register u_int caplen = h->caplen;
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ND_TCHECK2(*p, 4); /* minimum frame header length */
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if ((length = fr_print(ndo, p, length)) == 0)
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return (0);
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else
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return length;
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trunc:
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ND_PRINT((ndo, "[|fr]"));
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return caplen;
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}
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u_int
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fr_print(netdissect_options *ndo,
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register const u_char *p, u_int length)
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{
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int ret;
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uint16_t extracted_ethertype;
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u_int dlci;
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u_int addr_len;
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uint16_t nlpid;
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u_int hdr_len;
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uint8_t flags[4];
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ret = parse_q922_addr(ndo, p, &dlci, &addr_len, flags, length);
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if (ret == -1)
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goto trunc;
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if (ret == 0) {
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ND_PRINT((ndo, "Q.922, invalid address"));
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return 0;
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}
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ND_TCHECK(p[addr_len]);
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if (length < addr_len + 1)
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goto trunc;
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if (p[addr_len] != LLC_UI && dlci != 0) {
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/*
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* Let's figure out if we have Cisco-style encapsulation,
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* with an Ethernet type (Cisco HDLC type?) following the
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* address.
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*/
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if (!ND_TTEST2(p[addr_len], 2) || length < addr_len + 2) {
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/* no Ethertype */
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ND_PRINT((ndo, "UI %02x! ", p[addr_len]));
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} else {
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extracted_ethertype = EXTRACT_16BITS(p+addr_len);
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if (ndo->ndo_eflag)
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fr_hdr_print(ndo, length, addr_len, dlci,
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flags, extracted_ethertype);
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if (ethertype_print(ndo, extracted_ethertype,
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p+addr_len+ETHERTYPE_LEN,
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length-addr_len-ETHERTYPE_LEN,
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ndo->ndo_snapend-p-addr_len-ETHERTYPE_LEN,
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NULL, NULL) == 0)
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/* ether_type not known, probably it wasn't one */
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ND_PRINT((ndo, "UI %02x! ", p[addr_len]));
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else
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return addr_len + 2;
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}
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}
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ND_TCHECK(p[addr_len+1]);
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if (length < addr_len + 2)
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goto trunc;
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if (p[addr_len + 1] == 0) {
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/*
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* Assume a pad byte after the control (UI) byte.
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* A pad byte should only be used with 3-byte Q.922.
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*/
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if (addr_len != 3)
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ND_PRINT((ndo, "Pad! "));
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hdr_len = addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
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} else {
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/*
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* Not a pad byte.
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* A pad byte should be used with 3-byte Q.922.
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*/
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if (addr_len == 3)
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ND_PRINT((ndo, "No pad! "));
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hdr_len = addr_len + 1 /* UI */ + 1 /* NLPID */;
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}
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ND_TCHECK(p[hdr_len - 1]);
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if (length < hdr_len)
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goto trunc;
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nlpid = p[hdr_len - 1];
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if (ndo->ndo_eflag)
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fr_hdr_print(ndo, length, addr_len, dlci, flags, nlpid);
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p += hdr_len;
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length -= hdr_len;
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switch (nlpid) {
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case NLPID_IP:
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ip_print(ndo, p, length);
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break;
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case NLPID_IP6:
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ip6_print(ndo, p, length);
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break;
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case NLPID_CLNP:
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case NLPID_ESIS:
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case NLPID_ISIS:
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isoclns_print(ndo, p - 1, length + 1); /* OSI printers need the NLPID field */
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break;
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case NLPID_SNAP:
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if (snap_print(ndo, p, length, ndo->ndo_snapend - p, NULL, NULL, 0) == 0) {
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag)
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fr_hdr_print(ndo, length + hdr_len, hdr_len,
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dlci, flags, nlpid);
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p - hdr_len, length + hdr_len);
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}
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break;
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case NLPID_Q933:
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q933_print(ndo, p, length);
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break;
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case NLPID_MFR:
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frf15_print(ndo, p, length);
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break;
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case NLPID_PPP:
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ppp_print(ndo, p, length);
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break;
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default:
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if (!ndo->ndo_eflag)
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fr_hdr_print(ndo, length + hdr_len, addr_len,
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dlci, flags, nlpid);
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if (!ndo->ndo_xflag)
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ND_DEFAULTPRINT(p, length);
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}
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return hdr_len;
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trunc:
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ND_PRINT((ndo, "[|fr]"));
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return 0;
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}
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u_int
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mfr_if_print(netdissect_options *ndo,
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const struct pcap_pkthdr *h, register const u_char *p)
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{
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register u_int length = h->len;
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register u_int caplen = h->caplen;
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ND_TCHECK2(*p, 2); /* minimum frame header length */
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if ((length = mfr_print(ndo, p, length)) == 0)
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return (0);
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else
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return length;
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trunc:
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ND_PRINT((ndo, "[|mfr]"));
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return caplen;
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}
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#define MFR_CTRL_MSG_ADD_LINK 1
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#define MFR_CTRL_MSG_ADD_LINK_ACK 2
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#define MFR_CTRL_MSG_ADD_LINK_REJ 3
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#define MFR_CTRL_MSG_HELLO 4
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#define MFR_CTRL_MSG_HELLO_ACK 5
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#define MFR_CTRL_MSG_REMOVE_LINK 6
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#define MFR_CTRL_MSG_REMOVE_LINK_ACK 7
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static const struct tok mfr_ctrl_msg_values[] = {
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{ MFR_CTRL_MSG_ADD_LINK, "Add Link" },
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{ MFR_CTRL_MSG_ADD_LINK_ACK, "Add Link ACK" },
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{ MFR_CTRL_MSG_ADD_LINK_REJ, "Add Link Reject" },
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{ MFR_CTRL_MSG_HELLO, "Hello" },
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{ MFR_CTRL_MSG_HELLO_ACK, "Hello ACK" },
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{ MFR_CTRL_MSG_REMOVE_LINK, "Remove Link" },
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{ MFR_CTRL_MSG_REMOVE_LINK_ACK, "Remove Link ACK" },
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{ 0, NULL }
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};
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#define MFR_CTRL_IE_BUNDLE_ID 1
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#define MFR_CTRL_IE_LINK_ID 2
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#define MFR_CTRL_IE_MAGIC_NUM 3
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#define MFR_CTRL_IE_TIMESTAMP 5
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#define MFR_CTRL_IE_VENDOR_EXT 6
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#define MFR_CTRL_IE_CAUSE 7
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static const struct tok mfr_ctrl_ie_values[] = {
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{ MFR_CTRL_IE_BUNDLE_ID, "Bundle ID"},
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{ MFR_CTRL_IE_LINK_ID, "Link ID"},
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{ MFR_CTRL_IE_MAGIC_NUM, "Magic Number"},
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{ MFR_CTRL_IE_TIMESTAMP, "Timestamp"},
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{ MFR_CTRL_IE_VENDOR_EXT, "Vendor Extension"},
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{ MFR_CTRL_IE_CAUSE, "Cause"},
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{ 0, NULL }
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};
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|
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#define MFR_ID_STRING_MAXLEN 50
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|
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struct ie_tlv_header_t {
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uint8_t ie_type;
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uint8_t ie_len;
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};
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|
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u_int
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mfr_print(netdissect_options *ndo,
|
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register const u_char *p, u_int length)
|
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{
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u_int tlen,idx,hdr_len = 0;
|
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uint16_t sequence_num;
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uint8_t ie_type,ie_len;
|
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const uint8_t *tptr;
|
|
|
|
|
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/*
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* FRF.16 Link Integrity Control Frame
|
|
*
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* 7 6 5 4 3 2 1 0
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* +----+----+----+----+----+----+----+----+
|
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* | B | E | C=1| 0 0 0 0 | EA |
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* +----+----+----+----+----+----+----+----+
|
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* | 0 0 0 0 0 0 0 0 |
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* +----+----+----+----+----+----+----+----+
|
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* | message type |
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* +----+----+----+----+----+----+----+----+
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*/
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|
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ND_TCHECK2(*p, 4); /* minimum frame header length */
|
|
if (length < 4) {
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ND_PRINT((ndo, "Message too short (%u bytes)", length));
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return length;
|
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}
|
|
|
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if ((p[0] & MFR_BEC_MASK) == MFR_CTRL_FRAME && p[1] == 0) {
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ND_PRINT((ndo, "FRF.16 Control, Flags [%s], %s, length %u",
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bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK)),
|
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tok2str(mfr_ctrl_msg_values,"Unknown Message (0x%02x)",p[2]),
|
|
length));
|
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tptr = p + 3;
|
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tlen = length -3;
|
|
hdr_len = 3;
|
|
|
|
if (!ndo->ndo_vflag)
|
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return hdr_len;
|
|
|
|
while (tlen>sizeof(struct ie_tlv_header_t)) {
|
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ND_TCHECK2(*tptr, sizeof(struct ie_tlv_header_t));
|
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ie_type=tptr[0];
|
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ie_len=tptr[1];
|
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|
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ND_PRINT((ndo, "\n\tIE %s (%u), length %u: ",
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tok2str(mfr_ctrl_ie_values,"Unknown",ie_type),
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ie_type,
|
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ie_len));
|
|
|
|
/* infinite loop check */
|
|
if (ie_type == 0 || ie_len <= sizeof(struct ie_tlv_header_t))
|
|
return hdr_len;
|
|
|
|
ND_TCHECK2(*tptr, ie_len);
|
|
tptr+=sizeof(struct ie_tlv_header_t);
|
|
/* tlv len includes header */
|
|
ie_len-=sizeof(struct ie_tlv_header_t);
|
|
tlen-=sizeof(struct ie_tlv_header_t);
|
|
|
|
switch (ie_type) {
|
|
|
|
case MFR_CTRL_IE_MAGIC_NUM:
|
|
/* FRF.16.1 Section 3.4.3 Magic Number Information Element */
|
|
if (ie_len != 4) {
|
|
ND_PRINT((ndo, "(invalid length)"));
|
|
break;
|
|
}
|
|
ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(tptr)));
|
|
break;
|
|
|
|
case MFR_CTRL_IE_BUNDLE_ID: /* same message format */
|
|
case MFR_CTRL_IE_LINK_ID:
|
|
for (idx = 0; idx < ie_len && idx < MFR_ID_STRING_MAXLEN; idx++) {
|
|
if (*(tptr+idx) != 0) /* don't print null termination */
|
|
safeputchar(ndo, *(tptr + idx));
|
|
else
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case MFR_CTRL_IE_TIMESTAMP:
|
|
if (ie_len == sizeof(struct timeval)) {
|
|
ts_print(ndo, (const struct timeval *)tptr);
|
|
break;
|
|
}
|
|
/* fall through and hexdump if no unix timestamp */
|
|
|
|
/*
|
|
* FIXME those are the defined IEs that lack a decoder
|
|
* you are welcome to contribute code ;-)
|
|
*/
|
|
|
|
case MFR_CTRL_IE_VENDOR_EXT:
|
|
case MFR_CTRL_IE_CAUSE:
|
|
|
|
default:
|
|
if (ndo->ndo_vflag <= 1)
|
|
print_unknown_data(ndo, tptr, "\n\t ", ie_len);
|
|
break;
|
|
}
|
|
|
|
/* do we want to see a hexdump of the IE ? */
|
|
if (ndo->ndo_vflag > 1 )
|
|
print_unknown_data(ndo, tptr, "\n\t ", ie_len);
|
|
|
|
tlen-=ie_len;
|
|
tptr+=ie_len;
|
|
}
|
|
return hdr_len;
|
|
}
|
|
/*
|
|
* FRF.16 Fragmentation Frame
|
|
*
|
|
* 7 6 5 4 3 2 1 0
|
|
* +----+----+----+----+----+----+----+----+
|
|
* | B | E | C=0|seq. (high 4 bits) | EA |
|
|
* +----+----+----+----+----+----+----+----+
|
|
* | sequence (low 8 bits) |
|
|
* +----+----+----+----+----+----+----+----+
|
|
* | DLCI (6 bits) | CR | EA |
|
|
* +----+----+----+----+----+----+----+----+
|
|
* | DLCI (4 bits) |FECN|BECN| DE | EA |
|
|
* +----+----+----+----+----+----+----+----+
|
|
*/
|
|
|
|
sequence_num = (p[0]&0x1e)<<7 | p[1];
|
|
/* whole packet or first fragment ? */
|
|
if ((p[0] & MFR_BEC_MASK) == MFR_FRAG_FRAME ||
|
|
(p[0] & MFR_BEC_MASK) == MFR_B_BIT) {
|
|
ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s], ",
|
|
sequence_num,
|
|
bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))));
|
|
hdr_len = 2;
|
|
fr_print(ndo, p+hdr_len,length-hdr_len);
|
|
return hdr_len;
|
|
}
|
|
|
|
/* must be a middle or the last fragment */
|
|
ND_PRINT((ndo, "FRF.16 Frag, seq %u, Flags [%s]",
|
|
sequence_num,
|
|
bittok2str(frf_flag_values,"none",(p[0] & MFR_BEC_MASK))));
|
|
print_unknown_data(ndo, p, "\n\t", length);
|
|
|
|
return hdr_len;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "[|mfr]"));
|
|
return length;
|
|
}
|
|
|
|
/* 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) |
|
|
* +----+----+----+----+----+----+----+----+
|
|
*/
|
|
|
|
#define FR_FRF15_FRAGTYPE 0x01
|
|
|
|
static void
|
|
frf15_print(netdissect_options *ndo,
|
|
const u_char *p, u_int length)
|
|
{
|
|
uint16_t sequence_num, flags;
|
|
|
|
if (length < 2)
|
|
goto trunc;
|
|
ND_TCHECK2(*p, 2);
|
|
|
|
flags = p[0]&MFR_BEC_MASK;
|
|
sequence_num = (p[0]&0x1e)<<7 | p[1];
|
|
|
|
ND_PRINT((ndo, "FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
|
|
sequence_num,
|
|
bittok2str(frf_flag_values,"none",flags),
|
|
p[0]&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
|
|
*/
|
|
return;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "[|frf.15]"));
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
|
|
static const 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 IE_IS_SINGLE_OCTET(iecode) ((iecode) & 0x80)
|
|
#define IE_IS_SHIFT(iecode) (((iecode) & 0xF0) == 0x90)
|
|
#define IE_SHIFT_IS_NON_LOCKING(iecode) ((iecode) & 0x08)
|
|
#define IE_SHIFT_IS_LOCKING(iecode) (!(IE_SHIFT_IS_NON_LOCKING(iecode)))
|
|
#define IE_SHIFT_CODESET(iecode) ((iecode) & 0x07)
|
|
|
|
#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
|
|
|
|
static const struct tok fr_q933_ie_values_codeset_0_5[] = {
|
|
{ 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
|
|
|
|
static const 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 codesets - currently we only support codepage 0 and 5 */
|
|
static const struct tok *fr_q933_ie_codesets[] = {
|
|
fr_q933_ie_values_codeset_0_5,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
fr_q933_ie_values_codeset_0_5,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
static int fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode,
|
|
u_int ielength, const u_char *p);
|
|
|
|
typedef int (*codeset_pr_func_t)(netdissect_options *, u_int iecode,
|
|
u_int ielength, const u_char *p);
|
|
|
|
/* array of 16 codesets - currently we only support codepage 0 and 5 */
|
|
static const codeset_pr_func_t fr_q933_print_ie_codeset[] = {
|
|
fr_q933_print_ie_codeset_0_5,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
fr_q933_print_ie_codeset_0_5,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* ITU-T Q.933.
|
|
*
|
|
* p points to octet 2, the octet containing the length of the
|
|
* call reference value, so p[n] is octet n+2 ("octet X" is as
|
|
* used in Q.931/Q.933).
|
|
*
|
|
* XXX - actually used both for Q.931 and Q.933.
|
|
*/
|
|
void
|
|
q933_print(netdissect_options *ndo,
|
|
const u_char *p, u_int length)
|
|
{
|
|
u_int olen;
|
|
u_int call_ref_length, i;
|
|
uint8_t call_ref[15]; /* maximum length - length field is 4 bits */
|
|
u_int msgtype;
|
|
u_int iecode;
|
|
u_int ielength;
|
|
u_int codeset = 0;
|
|
u_int is_ansi = 0;
|
|
u_int ie_is_known;
|
|
u_int non_locking_shift;
|
|
u_int unshift_codeset;
|
|
|
|
ND_PRINT((ndo, "%s", ndo->ndo_eflag ? "" : "Q.933"));
|
|
|
|
if (length == 0 || !ND_TTEST(*p)) {
|
|
if (!ndo->ndo_eflag)
|
|
ND_PRINT((ndo, ", "));
|
|
ND_PRINT((ndo, "length %u", length));
|
|
goto trunc;
|
|
}
|
|
|
|
/*
|
|
* Get the length of the call reference value.
|
|
*/
|
|
olen = length; /* preserve the original length for display */
|
|
call_ref_length = (*p) & 0x0f;
|
|
p++;
|
|
length--;
|
|
|
|
/*
|
|
* Get the call reference value.
|
|
*/
|
|
for (i = 0; i < call_ref_length; i++) {
|
|
if (length == 0 || !ND_TTEST(*p)) {
|
|
if (!ndo->ndo_eflag)
|
|
ND_PRINT((ndo, ", "));
|
|
ND_PRINT((ndo, "length %u", olen));
|
|
goto trunc;
|
|
}
|
|
call_ref[i] = *p;
|
|
p++;
|
|
length--;
|
|
}
|
|
|
|
/*
|
|
* Get the message type.
|
|
*/
|
|
if (length == 0 || !ND_TTEST(*p)) {
|
|
if (!ndo->ndo_eflag)
|
|
ND_PRINT((ndo, ", "));
|
|
ND_PRINT((ndo, "length %u", olen));
|
|
goto trunc;
|
|
}
|
|
msgtype = *p;
|
|
p++;
|
|
length--;
|
|
|
|
/*
|
|
* Peek ahead to see if we start with a shift.
|
|
*/
|
|
non_locking_shift = 0;
|
|
unshift_codeset = codeset;
|
|
if (length != 0) {
|
|
if (!ND_TTEST(*p)) {
|
|
if (!ndo->ndo_eflag)
|
|
ND_PRINT((ndo, ", "));
|
|
ND_PRINT((ndo, "length %u", olen));
|
|
goto trunc;
|
|
}
|
|
iecode = *p;
|
|
if (IE_IS_SHIFT(iecode)) {
|
|
/*
|
|
* It's a shift. Skip over it.
|
|
*/
|
|
p++;
|
|
length--;
|
|
|
|
/*
|
|
* Get the codeset.
|
|
*/
|
|
codeset = IE_SHIFT_CODESET(iecode);
|
|
|
|
/*
|
|
* If it's a locking shift to codeset 5,
|
|
* mark this as ANSI. (XXX - 5 is actually
|
|
* for national variants in general, not
|
|
* the US variant in particular, but maybe
|
|
* this is more American exceptionalism. :-))
|
|
*/
|
|
if (IE_SHIFT_IS_LOCKING(iecode)) {
|
|
/*
|
|
* It's a locking shift.
|
|
*/
|
|
if (codeset == 5) {
|
|
/*
|
|
* It's a locking shift to
|
|
* codeset 5, so this is
|
|
* T1.617 Annex D.
|
|
*/
|
|
is_ansi = 1;
|
|
}
|
|
} else {
|
|
/*
|
|
* It's a non-locking shift.
|
|
* Remember the current codeset, so we
|
|
* can revert to it after the next IE.
|
|
*/
|
|
non_locking_shift = 1;
|
|
unshift_codeset = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* printing out header part */
|
|
if (!ndo->ndo_eflag)
|
|
ND_PRINT((ndo, ", "));
|
|
ND_PRINT((ndo, "%s, codeset %u", is_ansi ? "ANSI" : "CCITT", codeset));
|
|
|
|
if (call_ref_length != 0) {
|
|
ND_TCHECK(p[0]);
|
|
if (call_ref_length > 1 || p[0] != 0) {
|
|
/*
|
|
* Not a dummy call reference.
|
|
*/
|
|
ND_PRINT((ndo, ", Call Ref: 0x"));
|
|
for (i = 0; i < call_ref_length; i++)
|
|
ND_PRINT((ndo, "%02x", call_ref[i]));
|
|
}
|
|
}
|
|
if (ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", %s (0x%02x), length %u",
|
|
tok2str(fr_q933_msg_values,
|
|
"unknown message", msgtype),
|
|
msgtype,
|
|
olen));
|
|
} else {
|
|
ND_PRINT((ndo, ", %s",
|
|
tok2str(fr_q933_msg_values,
|
|
"unknown message 0x%02x", msgtype)));
|
|
}
|
|
|
|
/* Loop through the rest of the IEs */
|
|
while (length != 0) {
|
|
/*
|
|
* What's the state of any non-locking shifts?
|
|
*/
|
|
if (non_locking_shift == 1) {
|
|
/*
|
|
* There's a non-locking shift in effect for
|
|
* this IE. Count it, so we reset the codeset
|
|
* before the next IE.
|
|
*/
|
|
non_locking_shift = 2;
|
|
} else if (non_locking_shift == 2) {
|
|
/*
|
|
* Unshift.
|
|
*/
|
|
codeset = unshift_codeset;
|
|
non_locking_shift = 0;
|
|
}
|
|
|
|
/*
|
|
* Get the first octet of the IE.
|
|
*/
|
|
if (!ND_TTEST(*p)) {
|
|
if (!ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", length %u", olen));
|
|
}
|
|
goto trunc;
|
|
}
|
|
iecode = *p;
|
|
p++;
|
|
length--;
|
|
|
|
/* Single-octet IE? */
|
|
if (IE_IS_SINGLE_OCTET(iecode)) {
|
|
/*
|
|
* Yes. Is it a shift?
|
|
*/
|
|
if (IE_IS_SHIFT(iecode)) {
|
|
/*
|
|
* Yes. Is it locking?
|
|
*/
|
|
if (IE_SHIFT_IS_LOCKING(iecode)) {
|
|
/*
|
|
* Yes.
|
|
*/
|
|
non_locking_shift = 0;
|
|
} else {
|
|
/*
|
|
* No. Remember the current
|
|
* codeset, so we can revert
|
|
* to it after the next IE.
|
|
*/
|
|
non_locking_shift = 1;
|
|
unshift_codeset = codeset;
|
|
}
|
|
|
|
/*
|
|
* Get the codeset.
|
|
*/
|
|
codeset = IE_SHIFT_CODESET(iecode);
|
|
}
|
|
} else {
|
|
/*
|
|
* No. Get the IE length.
|
|
*/
|
|
if (length == 0 || !ND_TTEST(*p)) {
|
|
if (!ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", length %u", olen));
|
|
}
|
|
goto trunc;
|
|
}
|
|
ielength = *p;
|
|
p++;
|
|
length--;
|
|
|
|
/* lets do the full IE parsing only in verbose mode
|
|
* however some IEs (DLCI Status, Link Verify)
|
|
* are also interesting in non-verbose mode */
|
|
if (ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, "\n\t%s IE (0x%02x), length %u: ",
|
|
tok2str(fr_q933_ie_codesets[codeset],
|
|
"unknown", iecode),
|
|
iecode,
|
|
ielength));
|
|
}
|
|
|
|
/* sanity checks */
|
|
if (iecode == 0 || ielength == 0) {
|
|
return;
|
|
}
|
|
if (length < ielength || !ND_TTEST2(*p, ielength)) {
|
|
if (!ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", length %u", olen));
|
|
}
|
|
goto trunc;
|
|
}
|
|
|
|
ie_is_known = 0;
|
|
if (fr_q933_print_ie_codeset[codeset] != NULL) {
|
|
ie_is_known = fr_q933_print_ie_codeset[codeset](ndo, iecode, ielength, p);
|
|
}
|
|
|
|
if (ie_is_known) {
|
|
/*
|
|
* Known IE; do we want to see a hexdump
|
|
* of it?
|
|
*/
|
|
if (ndo->ndo_vflag > 1) {
|
|
/* Yes. */
|
|
print_unknown_data(ndo, p, "\n\t ", ielength);
|
|
}
|
|
} else {
|
|
/*
|
|
* Unknown IE; if we're printing verbosely,
|
|
* print its content in hex.
|
|
*/
|
|
if (ndo->ndo_vflag >= 1) {
|
|
print_unknown_data(ndo, p, "\n\t", ielength);
|
|
}
|
|
}
|
|
|
|
length -= ielength;
|
|
p += ielength;
|
|
}
|
|
}
|
|
if (!ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", length %u", olen));
|
|
}
|
|
return;
|
|
|
|
trunc:
|
|
ND_PRINT((ndo, "[|q.933]"));
|
|
}
|
|
|
|
static int
|
|
fr_q933_print_ie_codeset_0_5(netdissect_options *ndo, u_int iecode,
|
|
u_int ielength, const u_char *p)
|
|
{
|
|
u_int dlci;
|
|
|
|
switch (iecode) {
|
|
|
|
case FR_LMI_ANSI_REPORT_TYPE_IE: /* fall through */
|
|
case FR_LMI_CCITT_REPORT_TYPE_IE:
|
|
if (ielength < 1) {
|
|
if (!ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", "));
|
|
}
|
|
ND_PRINT((ndo, "Invalid REPORT TYPE IE"));
|
|
return 1;
|
|
}
|
|
if (ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, "%s (%u)",
|
|
tok2str(fr_lmi_report_type_ie_values,"unknown",p[0]),
|
|
p[0]));
|
|
}
|
|
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 (!ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", "));
|
|
}
|
|
if (ielength < 2) {
|
|
ND_PRINT((ndo, "Invalid LINK VERIFY IE"));
|
|
return 1;
|
|
}
|
|
ND_PRINT((ndo, "TX Seq: %3d, RX Seq: %3d", p[0], p[1]));
|
|
return 1;
|
|
|
|
case FR_LMI_ANSI_PVC_STATUS_IE: /* fall through */
|
|
case FR_LMI_CCITT_PVC_STATUS_IE:
|
|
if (!ndo->ndo_vflag) {
|
|
ND_PRINT((ndo, ", "));
|
|
}
|
|
/* now parse the DLCI information element. */
|
|
if ((ielength < 3) ||
|
|
(p[0] & 0x80) ||
|
|
((ielength == 3) && !(p[1] & 0x80)) ||
|
|
((ielength == 4) && ((p[1] & 0x80) || !(p[2] & 0x80))) ||
|
|
((ielength == 5) && ((p[1] & 0x80) || (p[2] & 0x80) ||
|
|
!(p[3] & 0x80))) ||
|
|
(ielength > 5) ||
|
|
!(p[ielength - 1] & 0x80)) {
|
|
ND_PRINT((ndo, "Invalid DLCI in PVC STATUS IE"));
|
|
return 1;
|
|
}
|
|
|
|
dlci = ((p[0] & 0x3F) << 4) | ((p[1] & 0x78) >> 3);
|
|
if (ielength == 4) {
|
|
dlci = (dlci << 6) | ((p[2] & 0x7E) >> 1);
|
|
}
|
|
else if (ielength == 5) {
|
|
dlci = (dlci << 13) | (p[2] & 0x7F) | ((p[3] & 0x7E) >> 1);
|
|
}
|
|
|
|
ND_PRINT((ndo, "DLCI %u: status %s%s", dlci,
|
|
p[ielength - 1] & 0x8 ? "New, " : "",
|
|
p[ielength - 1] & 0x2 ? "Active" : "Inactive"));
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
/*
|
|
* Local Variables:
|
|
* c-style: whitesmith
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|