Add frame-relay decode support.
This commit is contained in:
Paul Traina
parent
9bc192de1d
commit
13acb9488b
423
contrib/tcpdump/print-fr.c
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423
contrib/tcpdump/print-fr.c
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/*
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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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#ifndef lint
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static char rcsid[] =
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"@(#)$Header: /cvs/juniper/src/freebsd/contrib/tcpdump/print-fr.c,v 1.2 1997/07/18 20:24:15 boonmark Exp $ (LBL)";
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#endif
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#ifdef PPP
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#if __STDC__
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struct mbuf;
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struct rtentry;
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#endif
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <pcap.h>
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#include <signal.h>
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#include <stdio.h>
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#include <netinet/if_ether.h>
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#include "ethertype.h"
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#include <net/ppp_defs.h>
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#include "interface.h"
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#include "addrtoname.h"
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void q933_print();
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#define FR_EA_BIT(p) ((p)&0x1)
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#define FR_DLCI(b0,b1) ((((b0)&0xFC)<<2)+(((b1)&0xF0)>>4))
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struct fr_nlpids {
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u_short id;
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char *name;
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};
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/* find out how many bytes are there in a frame */
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int
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fr_addr_len(const u_char *p)
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{
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int i=0;
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while (!FR_EA_BIT(p[i]) && i++ && !FR_EA_BIT(p[i+1])) i++;
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return (i+1);
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}
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/* the following is for framerelay */
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#define NLPID_LEN 1 /* NLPID is one byte long */
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#define NLPID_Q933 0x08
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#define NLPID_CLNP 0x81
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#define NLPID_ESIS 0x82
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#define NLPID_ISIS 0x83
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#define NLPID_CONS 0x84
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#define NLPID_IDRP 0x85
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#define NLPID_X25_ESIS 0x8a
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#define NLPID_IP 0xcc
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static struct fr_nlpids fr_nlpids[256];
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static fr_nlpid_flag =0;
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void init_fr_nlpids()
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{
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int i;
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if (!fr_nlpid_flag) {
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for (i=0; i < 256; i++) {
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fr_nlpids[i].id = 0;
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fr_nlpids[i].name = "Not Specified";
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}
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fr_nlpids[NLPID_Q933].name = "Q.933";
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fr_nlpids[NLPID_CLNP].name = "CLNP";
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fr_nlpids[NLPID_ESIS].name = "ESIS";
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fr_nlpids[NLPID_ISIS].name = "ISIS";
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fr_nlpids[NLPID_CONS].name = "CONS";
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fr_nlpids[NLPID_IDRP].name = "IDRP";
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fr_nlpids[NLPID_X25_ESIS].name = "X25_ESIS";
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fr_nlpids[NLPID_IP].name = "IP";
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}
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fr_nlpid_flag = 1;
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}
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/* Framerelay packet structure */
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/*
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+---------------------------+
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| flag (7E hexadecimal) |
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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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| Frame Check Sequence |
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+-- . --+
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| (two octets) |
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+---------------------------+
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| flag (7E hexadecimal) |
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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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#define FR_PROTOCOL(p) fr_protocol((p))
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int
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fr_hdrlen(const u_char *p)
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{
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int hlen;
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hlen = fr_addr_len(p)+1; /* addr_len + 0x03 + padding */
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if( p[hlen] )
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return hlen;
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else
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return hlen+1;
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}
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#define LAYER2_LEN(p) (fr_hdrlen((p))+NLPID_LEN)
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int
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fr_protocol(const u_char *p)
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{
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int hlen;
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hlen = fr_addr_len(p) + 1;
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if (p[hlen]) /* check for padding */
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return p[hlen];
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else
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return p[hlen+1];
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}
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void
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fr_hdlc_print(const u_char *p, int length)
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{
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int proto;
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int i;
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int hlen;
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proto = FR_PROTOCOL(p);
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init_fr_nlpids();
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/* this is kinda kludge since it assumed that DLCI is two bytes. */
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printf("%4d %02x%02x=DLCI(%d) ", length, p[0], p[1], FR_DLCI(p[0],p[1]));
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printf("%02x %6s: ", proto, fr_nlpids[proto].name);
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}
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void
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fr_if_print(u_char *user, const struct pcap_pkthdr *h,
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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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int frame_relay = 0,
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proto = FR_PROTOCOL(p);
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ts_print(&h->ts);
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if (caplen < fr_hdrlen(p)) {
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printf("[|fr]");
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goto out;
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}
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/*
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* Some printers want to get back at the link level addresses,
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* and/or check that they're not walking off the end of the packet.
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* Rather than pass them all the way down, we set these globals.
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*/
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packetp = p;
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snapend = p + caplen;
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if (eflag)
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fr_hdlc_print(p, length);
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length = length - (fr_hdrlen(p) + NLPID_LEN);
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switch(FR_PROTOCOL(p)) {
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case NLPID_IP:
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case ETHERTYPE_IP:
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ip_print((const u_char *)(p + LAYER2_LEN(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((const u_char *)(p + LAYER2_LEN(p)), length,
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caplen, "000000", "000000");
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break;
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case NLPID_Q933:
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q933_print((const u_char *)(p + LAYER2_LEN(p)), length);
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break;
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default:
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if(!eflag)
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fr_hdlc_print(p, length);
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if(!xflag)
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default_print((const u_char *)(p + LAYER2_LEN(p)),
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caplen - LAYER2_LEN(p));
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}
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if (xflag)
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default_print((const u_char *)(p + LAYER2_LEN(p)),
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caplen - LAYER2_LEN(p));
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out:
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putchar('\n');
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}
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#else
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include "interface.h"
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void
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fr_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
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{
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error("not configured for ppp");
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/* NOTREACHED */
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}
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#endif
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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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#define ONE_BYTE_IE_MASK 0xF0
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/* See L2 protocol ID picture above */
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struct q933_header {
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u_char call_ref; /* usually is 0 for framerelay PVC */
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u_char msg_type;
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};
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#define REPORT_TYPE_IE 0x01
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#define LINK_VERIFY_IE_91 0x19
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#define LINK_VERIFY_IE_94 0x03
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#define PVC_STATUS_IE 0x07
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#define MAX_IE_SIZE
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struct common_ie_header {
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u_char ie_id;
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u_char ie_len;
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};
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#define FULL_STATUS 0
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#define LINK_VERIFY 1
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#define ASYNC_PVC 2
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void
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q933_print(const u_char *p, int length)
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{
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struct q933_header *header = (struct q933_header *)(p+1);
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const u_char *ptemp = p;
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int ie_type, ie_len;
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char *decode_str, temp_str[255];
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struct common_ie_header *ie_p;
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/* printing out header part */
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printf("Call Ref: %02x, MSG Type: %02x",
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header->call_ref, header->msg_type);
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switch(header->msg_type) {
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case MSG_TYPE_STATUS:
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decode_str = "STATUS REPLY";
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break;
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case MSG_TYPE_STATUS_ENQ:
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decode_str = "STATUS ENQUIRY";
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break;
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default:
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decode_str = "UNKNOWN MSG Type";
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}
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printf(" %s\n", decode_str);
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length = length - 3;
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ptemp = ptemp + 3;
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/* Loop through the rest of IE */
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while( length > 0 ) {
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if( ptemp[0] & ONE_BYTE_IE_MASK ) {
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ie_len = 1;
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printf("\t\tOne byte IE: %02x, Content %02x\n",
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(*ptemp & 0x70)>>4, (*ptemp & 0x0F));
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length--;
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ptemp++;
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}
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else { /* Multi-byte IE */
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ie_p = (struct common_ie_header *)ptemp;
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switch (ie_p->ie_id) {
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case REPORT_TYPE_IE:
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switch(ptemp[2]) {
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case FULL_STATUS:
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decode_str = "FULL STATUS";
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break;
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case LINK_VERIFY:
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decode_str = "LINK VERIFY";
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break;
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case ASYNC_PVC:
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decode_str = "Async PVC Status";
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break;
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default:
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decode_str = "Reserved Value";
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}
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break;
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case LINK_VERIFY_IE_91:
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case LINK_VERIFY_IE_94:
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sprintf(temp_str,"TX Seq: %3d, RX Seq: %3d",
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ptemp[2], ptemp[3]);
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decode_str = temp_str;
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break;
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case PVC_STATUS_IE:
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sprintf(temp_str,"DLCI %d: status %s %s",
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((ptemp[2]&0x3f)<<4)+ ((ptemp[3]&0x78)>>3),
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ptemp[4] & 0x8 ?"new,":" ",
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ptemp[4] & 0x2 ?"Active":"Inactive");
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break;
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default:
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decode_str = "Non-decoded Value";
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}
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printf("\t\tIE: %02X Len: %d, %s\n",
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ie_p->ie_id, ie_p->ie_len, decode_str);
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length = length - ie_p->ie_len - 2;
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ptemp = ptemp + ie_p->ie_len + 2;
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}
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}
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}
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