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6d6270c6b4
tcpdump/print-fr.c
guy 6d6270c6b4 From Paul S. Traina: FreeBSD's Frame Relay printer. 
Make the code to print a SNAP-encapsulated packet a separate routine,
for use by the Frame Relay code.
2002-07-11 08:09:45 +00:00

449 lines
12 KiB
C
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/*
* Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static const char rcsid[] =
"@(#)$Header: /tcpdump/master/tcpdump/print-fr.c,v 1.1 2002-07-11 08:09:47 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
struct mbuf;
struct rtentry;
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <pcap.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
static void q933_print(const u_char *, int);
#define FR_CR_BIT 0x02
#define FR_EA_BIT(p) ((p)&0x01)
#define FR_FECN 0x08
#define FR_BECN 0x04
#define FR_DE 0x02
#define FR_DLCI(b0, b1) ((((b0)&0xFC)<<2)+(((b1)&0xF0)>>4))
/* find out how many bytes are there in a frame */
static int
fr_addr_len(const u_char *p)
{
int i=0;
while (!FR_EA_BIT(p[i]) && i++ && !FR_EA_BIT(p[i+1])) i++;
return (i+1);
}
/* the following is for framerelay */
#define NLPID_LEN 1 /* NLPID is one byte long */
#define NLPID_Q933 0x08
#define NLPID_LMI 0x09
#define NLPID_SNAP 0x80
#define NLPID_CLNP 0x81
#define NLPID_ESIS 0x82
#define NLPID_ISIS 0x83
#define NLPID_CONS 0x84
#define NLPID_IDRP 0x85
#define NLPID_X25_ESIS 0x8a
#define NLPID_IP 0xcc
static const char *fr_nlpids[256];
static void
init_fr_nlpids(void)
{
int i;
static int fr_nlpid_flag = 0;
if (!fr_nlpid_flag) {
for (i=0; i < 256; i++)
fr_nlpids[i] = NULL;
fr_nlpids[NLPID_Q933] = "Q.933";
fr_nlpids[NLPID_LMI] = "LMI";
fr_nlpids[NLPID_SNAP] = "SNAP";
fr_nlpids[NLPID_CLNP] = "CLNP";
fr_nlpids[NLPID_ESIS] = "ESIS";
fr_nlpids[NLPID_ISIS] = "ISIS";
fr_nlpids[NLPID_CONS] = "CONS";
fr_nlpids[NLPID_IDRP] = "IDRP";
fr_nlpids[NLPID_X25_ESIS] = "X25_ESIS";
fr_nlpids[NLPID_IP] = "IP";
}
fr_nlpid_flag = 1;
}
/* Framerelay packet structure */
/*
+---------------------------+
| flag (7E hexadecimal) |
+---------------------------+
| Q.922 Address* |
+-- --+
| |
+---------------------------+
| Control (UI = 0x03) |
+---------------------------+
| Optional Pad (0x00) |
+---------------------------+
| NLPID |
+---------------------------+
| . |
| . |
| . |
| Data |
| . |
| . |
+---------------------------+
| Frame Check Sequence |
+-- . --+
| (two octets) |
+---------------------------+
| flag (7E hexadecimal) |
+---------------------------+
* Q.922 addresses, as presently defined, are two octets and
contain a 10-bit DLCI. In some networks Q.922 addresses
may optionally be increased to three or four octets.
*/
#define FR_PROTOCOL(p) fr_protocol((p))
static int
fr_hdrlen(const u_char *p)
{
int hlen;
hlen = fr_addr_len(p)+1; /* addr_len + 0x03 + padding */
if (p[hlen])
return hlen;
else
return hlen+1;
}
#define LAYER2_LEN(p) (fr_hdrlen((p))+NLPID_LEN)
static int
fr_protocol(const u_char *p)
{
int hlen;
hlen = fr_addr_len(p) + 1;
if (p[hlen]) /* check for padding */
return p[hlen];
else
return p[hlen+1];
}
static char *
fr_flags(const u_char *p)
{
static char flags[1+1+4+1+4+1+2+1];
if (p[0] & FR_CR_BIT)
strcpy(flags, "C");
else
strcpy(flags, "R");
if (p[1] & FR_FECN)
strcat(flags, ",FECN");
if (p[1] & FR_BECN)
strcat(flags, ",BECN");
if (p[1] & FR_DE)
strcat(flags, ",DE");
return flags;
}
static const char *
fr_protostring(u_int8_t proto)
{
static char buf[5+1+2+1];
if (nflag || fr_nlpids[proto] == NULL) {
sprintf(buf, "proto-%02x", proto);
return buf;
}
return fr_nlpids[proto];
}
static void
fr_hdr_print(const u_char *p, int length)
{
u_int8_t proto;
proto = FR_PROTOCOL(p);
init_fr_nlpids();
/* this is kinda kludge since it assumed that DLCI is two bytes. */
if (qflag)
(void)printf("DLCI-%u-%s %d: ",
FR_DLCI(p[0], p[1]), fr_flags(p), length);
else
(void)printf("DLCI-%u-%s %s %d: ",
FR_DLCI(p[0], p[1]), fr_flags(p),
fr_protostring(proto), length);
}
void
fr_if_print(u_char *user, const struct pcap_pkthdr *h,
register const u_char *p)
{
register u_int length = h->len;
register u_int caplen = h->caplen;
u_char protocol;
int layer2_len;
u_short extracted_ethertype;
u_int32_t orgcode;
register u_short et;
ts_print(&h->ts);
if (caplen < fr_hdrlen(p)) {
printf("[|fr]");
goto out;
}
/*
* Some printers want to get back at the link level addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
packetp = p;
snapend = p + caplen;
if (eflag)
fr_hdr_print(p, length);
protocol = FR_PROTOCOL(p);
layer2_len = LAYER2_LEN(p);
p += layer2_len;
length -= layer2_len;
caplen -= layer2_len;
switch (protocol) {
case NLPID_IP:
case ETHERTYPE_IP:
ip_print(p, length);
break;
case NLPID_CLNP:
case NLPID_ESIS:
case NLPID_ISIS:
isoclns_print(p, length, caplen, NULL, NULL);
break;
case NLPID_SNAP:
orgcode = EXTRACT_24BITS(p);
et = EXTRACT_16BITS(p + 3);
if (snap_print((const u_char *)(p + 5), length - 5,
caplen - 5, NULL, NULL,
&extracted_ethertype, orgcode, et) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
fr_hdr_print(p - layer2_len, length + layer2_len);
if (extracted_ethertype) {
printf("(SNAP %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!xflag && !qflag)
default_print(p - layer2_len, caplen + layer2_len);
}
break;
case NLPID_Q933:
q933_print(p, length);
break;
default:
if (!eflag)
fr_hdr_print(p - layer2_len, length + layer2_len);
if (!xflag)
default_print(p, caplen);
}
if (xflag)
default_print(p, caplen);
out:
putchar('\n');
}
/*
* 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
#define ONE_BYTE_IE_MASK 0xF0
/* See L2 protocol ID picture above */
struct q933_header {
u_char call_ref; /* usually is 0 for framerelay PVC */
u_char msg_type;
};
#define REPORT_TYPE_IE 0x01
#define LINK_VERIFY_IE_91 0x19
#define LINK_VERIFY_IE_94 0x03
#define PVC_STATUS_IE 0x07
#define MAX_IE_SIZE
struct common_ie_header {
u_char ie_id;
u_char ie_len;
};
#define FULL_STATUS 0
#define LINK_VERIFY 1
#define ASYNC_PVC 2
static void
q933_print(const u_char *p, int length)
{
struct q933_header *header = (struct q933_header *)(p+1);
const u_char *ptemp = p;
int ie_len;
char *decode_str, temp_str[255];
struct common_ie_header *ie_p;
/* printing out header part */
printf("Call Ref: %02x, MSG Type: %02x",
header->call_ref, header->msg_type);
switch(header->msg_type) {
case MSG_TYPE_STATUS:
decode_str = "STATUS REPLY";
break;
case MSG_TYPE_STATUS_ENQ:
decode_str = "STATUS ENQUIRY";
break;
default:
decode_str = "UNKNOWN MSG Type";
}
printf(" %s\n", decode_str);
length = length - 3;
ptemp = ptemp + 3;
/* Loop through the rest of IE */
while( length > 0 ) {
if (ptemp[0] & ONE_BYTE_IE_MASK) {
ie_len = 1;
printf("\t\tOne byte IE: %02x, Content %02x\n",
(*ptemp & 0x70)>>4, (*ptemp & 0x0F));
length--;
ptemp++;
}
else { /* Multi-byte IE */
ie_p = (struct common_ie_header *)ptemp;
switch (ie_p->ie_id) {
case REPORT_TYPE_IE:
switch(ptemp[2]) {
case FULL_STATUS:
decode_str = "FULL STATUS";
break;
case LINK_VERIFY:
decode_str = "LINK VERIFY";
break;
case ASYNC_PVC:
decode_str = "Async PVC Status";
break;
default:
decode_str = "Reserved Value";
}
break;
case LINK_VERIFY_IE_91:
case LINK_VERIFY_IE_94:
snprintf(temp_str, sizeof (temp_str), "TX Seq: %3d, RX Seq: %3d",
ptemp[2], ptemp[3]);
decode_str = temp_str;
break;
case PVC_STATUS_IE:
snprintf(temp_str, sizeof (temp_str), "DLCI %d: status %s %s",
((ptemp[2]&0x3f)<<4)+ ((ptemp[3]&0x78)>>3),
ptemp[4] & 0x8 ?"new,":" ",
ptemp[4] & 0x2 ?"Active":"Inactive");
break;
default:
decode_str = "Non-decoded Value";
}
printf("\t\tIE: %02X Len: %d, %s\n",
ie_p->ie_id, ie_p->ie_len, decode_str);
length = length - ie_p->ie_len - 2;
ptemp = ptemp + ie_p->ie_len + 2;
}
}
}
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