644 lines
19 KiB
C
644 lines
19 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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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.32.2.4 2005/05/27 14:56:52 hannes Exp $ (LBL)";
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#endif
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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 <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <string.h>
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#include <pcap.h>
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#include "addrtoname.h"
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#include "interface.h"
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#include "ethertype.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(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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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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/* Finds out Q.922 address length, DLCI and flags. Returns 0 on success
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* save the flags dep. on address length
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*/
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static int parse_q922_addr(const u_char *p, u_int *dlci, u_int *sdlcore,
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u_int *addr_len, u_int8_t *flags)
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{
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if ((p[0] & FR_EA_BIT))
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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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if (p[1] & FR_EA_BIT)
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return 0; /* 2-byte Q.922 address */
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p += 2;
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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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}
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if ((p[0] & FR_EA_BIT) == 0)
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return -1; /* more than 4 bytes of Q.922 address? */
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flags[3] = p[0] & 0x02;
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if (p[0] & 0x02)
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*sdlcore = p[0] >> 2;
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else
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*dlci = (*dlci << 6) | (p[0] >> 2);
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return 0;
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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 u_int
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fr_hdrlen(const u_char *p, u_int addr_len)
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{
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if (!p[addr_len + 1] /* pad exist */)
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return addr_len + 1 /* UI */ + 1 /* pad */ + 1 /* NLPID */;
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else
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return addr_len + 1 /* UI */ + 1 /* NLPID */;
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}
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static void
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fr_hdr_print(int length, u_int addr_len, u_int dlci, u_int8_t *flags, u_int16_t nlpid)
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{
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if (qflag) {
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(void)printf("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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(void)printf("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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(void)printf("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(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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TCHECK2(*p, 4); /* minimum frame header length */
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if ((length = fr_print(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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printf("[|fr]");
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return caplen;
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}
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u_int
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fr_print(register const u_char *p, u_int length)
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{
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u_int16_t extracted_ethertype;
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u_int dlci;
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u_int sdlcore;
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u_int addr_len;
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u_int16_t nlpid;
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u_int hdr_len;
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u_int8_t flags[4];
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if (parse_q922_addr(p, &dlci, &sdlcore, &addr_len, flags)) {
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printf("Q.922, invalid address");
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return 0;
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}
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TCHECK2(*p,addr_len+1+1);
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hdr_len = fr_hdrlen(p, addr_len);
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TCHECK2(*p,hdr_len);
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if (p[addr_len] != 0x03 && dlci != 0) {
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/* lets figure out if we have cisco style encapsulation: */
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extracted_ethertype = EXTRACT_16BITS(p+addr_len);
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if (eflag)
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fr_hdr_print(length, addr_len, dlci, flags, extracted_ethertype);
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if (ether_encap_print(extracted_ethertype,
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p+addr_len+ETHERTYPE_LEN,
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length-addr_len-ETHERTYPE_LEN,
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length-addr_len-ETHERTYPE_LEN,
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&extracted_ethertype) == 0)
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/* ether_type not known, probably it wasn't one */
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printf("UI %02x! ", p[addr_len]);
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else
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return hdr_len;
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}
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if (!p[addr_len + 1]) { /* pad byte should be used with 3-byte Q.922 */
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if (addr_len != 3)
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printf("Pad! ");
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} else if (addr_len == 3)
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printf("No pad! ");
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nlpid = p[hdr_len - 1];
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if (eflag)
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fr_hdr_print(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(gndo, p, length);
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break;
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#ifdef INET6
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case NLPID_IP6:
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ip6_print(p, length);
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break;
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#endif
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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(p-1, length+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(p, length, length, &extracted_ethertype, 0) == 0) {
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/* ether_type not known, print raw packet */
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if (!eflag)
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fr_hdr_print(length + hdr_len, hdr_len,
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dlci, flags, nlpid);
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if (!xflag && !qflag)
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default_print(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(p, length);
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break;
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case NLPID_MFR:
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frf15_print(p, length);
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break;
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default:
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if (!eflag)
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fr_hdr_print(length + hdr_len, addr_len,
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dlci, flags, nlpid);
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if (!xflag)
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default_print(p, length);
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}
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return hdr_len;
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trunc:
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printf("[|fr]");
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return 0;
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}
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/* an NLPID of 0xb1 indicates a 2-byte
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* FRF.15 header
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*
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* 7 6 5 4 3 2 1 0
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* +----+----+----+----+----+----+----+----+
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* ~ Q.922 header ~
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* +----+----+----+----+----+----+----+----+
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* | NLPID (8 bits) | NLPID=0xb1
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* +----+----+----+----+----+----+----+----+
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* | B | E | C |seq. (high 4 bits) | R |
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* +----+----+----+----+----+----+----+----+
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* | sequence (low 8 bits) |
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* +----+----+----+----+----+----+----+----+
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*/
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struct tok frf15_flag_values[] = {
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{ 0x80, "Begin" },
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{ 0x40, "End" },
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{ 0x20, "Control" },
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{ 0, NULL }
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};
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#define FR_FRF15_FRAGTYPE 0x01
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static void
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frf15_print (const u_char *p, u_int length) {
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u_int16_t sequence_num, flags;
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flags = p[0]&0xe0;
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sequence_num = (p[0]&0x1e)<<7 | p[1];
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printf("FRF.15, seq 0x%03x, Flags [%s],%s Fragmentation, length %u",
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sequence_num,
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bittok2str(frf15_flag_values,"none",flags),
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flags&FR_FRF15_FRAGTYPE ? "Interface" : "End-to-End",
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length);
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/* TODO:
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* depending on all permutations of the B, E and C bit
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* dig as deep as we can - e.g. on the first (B) fragment
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* there is enough payload to print the IP header
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* on non (B) fragments it depends if the fragmentation
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* model is end-to-end or interface based wether we want to print
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* another Q.922 header
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*/
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}
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/*
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* Q.933 decoding portion for framerelay specific.
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*/
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/* Q.933 packet format
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Format of Other Protocols
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using Q.933 NLPID
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+-------------------------------+
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| Q.922 Address |
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+---------------+---------------+
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|Control 0x03 | NLPID 0x08 |
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+---------------+---------------+
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| L2 Protocol ID |
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| octet 1 | octet 2 |
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+-------------------------------+
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| L3 Protocol ID |
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| octet 2 | octet 2 |
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+-------------------------------+
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| Protocol Data |
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+-------------------------------+
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| FCS |
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+-------------------------------+
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*/
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/* L2 (Octet 1)- Call Reference Usually is 0x0 */
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/*
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* L2 (Octet 2)- Message Types definition 1 byte long.
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*/
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/* Call Establish */
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#define MSG_TYPE_ESC_TO_NATIONAL 0x00
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#define MSG_TYPE_ALERT 0x01
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#define MSG_TYPE_CALL_PROCEEDING 0x02
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#define MSG_TYPE_CONNECT 0x07
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#define MSG_TYPE_CONNECT_ACK 0x0F
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#define MSG_TYPE_PROGRESS 0x03
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#define MSG_TYPE_SETUP 0x05
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/* Call Clear */
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#define MSG_TYPE_DISCONNECT 0x45
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#define MSG_TYPE_RELEASE 0x4D
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#define MSG_TYPE_RELEASE_COMPLETE 0x5A
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#define MSG_TYPE_RESTART 0x46
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#define MSG_TYPE_RESTART_ACK 0x4E
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/* Status */
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#define MSG_TYPE_STATUS 0x7D
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#define MSG_TYPE_STATUS_ENQ 0x75
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struct tok fr_q933_msg_values[] = {
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{ MSG_TYPE_ESC_TO_NATIONAL, "ESC to National" },
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{ MSG_TYPE_ALERT, "Alert" },
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{ MSG_TYPE_CALL_PROCEEDING, "Call proceeding" },
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{ MSG_TYPE_CONNECT, "Connect" },
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{ MSG_TYPE_CONNECT_ACK, "Connect ACK" },
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{ MSG_TYPE_PROGRESS, "Progress" },
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{ MSG_TYPE_SETUP, "Setup" },
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{ MSG_TYPE_DISCONNECT, "Disconnect" },
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{ MSG_TYPE_RELEASE, "Release" },
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{ MSG_TYPE_RELEASE_COMPLETE, "Release Complete" },
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{ MSG_TYPE_RESTART, "Restart" },
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{ MSG_TYPE_RESTART_ACK, "Restart ACK" },
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{ MSG_TYPE_STATUS, "Status Reply" },
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{ MSG_TYPE_STATUS_ENQ, "Status Enquiry" },
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{ 0, NULL }
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};
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#define MSG_ANSI_LOCKING_SHIFT 0x95
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#define FR_LMI_ANSI_REPORT_TYPE_IE 0x01
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#define FR_LMI_ANSI_LINK_VERIFY_IE_91 0x19 /* details? */
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#define FR_LMI_ANSI_LINK_VERIFY_IE 0x03
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#define FR_LMI_ANSI_PVC_STATUS_IE 0x07
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#define FR_LMI_CCITT_REPORT_TYPE_IE 0x51
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#define FR_LMI_CCITT_LINK_VERIFY_IE 0x53
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#define FR_LMI_CCITT_PVC_STATUS_IE 0x57
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struct tok fr_q933_ie_values_codeset5[] = {
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{ FR_LMI_ANSI_REPORT_TYPE_IE, "ANSI Report Type" },
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{ FR_LMI_ANSI_LINK_VERIFY_IE_91, "ANSI Link Verify" },
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{ FR_LMI_ANSI_LINK_VERIFY_IE, "ANSI Link Verify" },
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{ FR_LMI_ANSI_PVC_STATUS_IE, "ANSI PVC Status" },
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{ FR_LMI_CCITT_REPORT_TYPE_IE, "CCITT Report Type" },
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{ FR_LMI_CCITT_LINK_VERIFY_IE, "CCITT Link Verify" },
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{ FR_LMI_CCITT_PVC_STATUS_IE, "CCITT PVC Status" },
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{ 0, NULL }
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};
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#define FR_LMI_REPORT_TYPE_IE_FULL_STATUS 0
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#define FR_LMI_REPORT_TYPE_IE_LINK_VERIFY 1
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#define FR_LMI_REPORT_TYPE_IE_ASYNC_PVC 2
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struct tok fr_lmi_report_type_ie_values[] = {
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{ FR_LMI_REPORT_TYPE_IE_FULL_STATUS, "Full Status" },
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{ FR_LMI_REPORT_TYPE_IE_LINK_VERIFY, "Link verify" },
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{ FR_LMI_REPORT_TYPE_IE_ASYNC_PVC, "Async PVC Status" },
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{ 0, NULL }
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};
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/* array of 16 codepages - currently we only support codepage 5 */
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static struct tok *fr_q933_ie_codesets[] = {
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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fr_q933_ie_values_codeset5,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL
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};
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struct common_ie_header {
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u_int8_t ie_id;
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u_int8_t ie_len;
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};
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static int fr_q933_print_ie_codeset5(const struct common_ie_header *ie_p,
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const u_char *p);
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typedef int (*codeset_pr_func_t)(const struct common_ie_header *ie_p,
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const u_char *p);
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/* array of 16 codepages - currently we only support codepage 5 */
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static codeset_pr_func_t fr_q933_print_ie_codeset[] = {
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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fr_q933_print_ie_codeset5,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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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;
|
|
}
|