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1c1351793c
freebsd/contrib/tcpdump/print-isoclns.c

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C
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/*
* Copyright (c) 1992, 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.
*
* Original code by Matt Thomas, Digital Equipment Corporation
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: print-isoclns.c,v 1.14 96/12/10 23:26:56 leres Exp $ (LBL)";
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#if __STDC__
struct mbuf;
struct rtentry;
#endif
#include <net/if.h>
#include <netinet/in.h>
#include <net/ethernet.h>
#include <stdio.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
#define NLPID_CLNS 129 /* 0x81 */
#define NLPID_ESIS 130 /* 0x82 */
#define NLPID_ISIS 131 /* 0x83 */
#define NLPID_NULLNS 0
/*
* IS-IS is defined in ISO 10589. Look there for protocol definitions.
*/
#define SYSTEM_ID_LEN sizeof(struct ether_addr)
#define ISIS_VERSION 1
#define PDU_TYPE_MASK 0x1F
#define PRIORITY_MASK 0x7F
#define L1_LAN_IIH 15
#define L2_LAN_IIH 16
#define PTP_IIH 17
#define L1_LS_PDU 18
#define L2_LS_PDU 19
#define L1_COMPLETE_SEQ_PDU 24
#define L2_COMPLETE_SEQ_PDU 25
/*
* A TLV is a tuple of a type, length and a value and is normally used for
* encoding information in all sorts of places. This is an enumeration of
* the well known types.
*/
#define TLV_AREA_ADDR 1
#define TLV_IS_REACH 2
#define TLV_ES_REACH 3
#define TLV_SUMMARY 5
#define TLV_ISNEIGH 6
#define TLV_PADDING 8
#define TLV_LSP 9
#define TLV_AUTHENT 10
#define TLV_IP_REACH 128
#define TLV_PROTOCOLS 129
#define TLV_IP_EXTERN 130
#define TLV_IDRP_INFO 131
#define TLV_IPADDR 132
#define TLV_IPAUTH 133
#define TLV_PTP_ADJ 240
/*
* Katz's point to point adjacency TLV uses codes to tell us the state of
* the remote adjacency. Enumerate them.
*/
#define ISIS_PTP_ADJ_UP 0
#define ISIS_PTP_ADJ_INIT 1
#define ISIS_PTP_ADJ_DOWN 2
static int osi_cksum(const u_char *, int, u_char *);
static void esis_print(const u_char *, u_int);
static int isis_print(const u_char *, u_int);
struct isis_ptp_adjancey_values {
u_char id;
char *name;
};
static struct isis_ptp_adjancey_values isis_ptp_adjancey_values[] = {
ISIS_PTP_ADJ_UP, "UP",
ISIS_PTP_ADJ_INIT, "INIT",
ISIS_PTP_ADJ_DOWN, "DOWN"
};
struct isis_common_header {
u_char nlpid;
u_char fixed_len;
u_char version; /* Protocol version? */
u_char id_length;
u_char enc_pdu_type; /* 3 MSbs are reserved */
u_char pkt_version; /* Packet format version? */
u_char reserved;
u_char enc_max_area;
};
struct isis_header {
u_char nlpid;
u_char fixed_len;
u_char version; /* Protocol version? */
u_char id_length;
u_char enc_pdu_type; /* 3 MSbs are reserved */
u_char pkt_version; /* Packet format version? */
u_char reserved;
u_char enc_max_area;
u_char circuit;
u_char enc_source_id[SYSTEM_ID_LEN];
u_char enc_holding_time[2];
u_char enc_packet_len[2];
u_char enc_priority;
u_char enc_lan_id[SYSTEM_ID_LEN+1];
};
struct isis_lan_header {
u_char circuit;
u_char enc_source_id[SYSTEM_ID_LEN];
u_char enc_holding_time[2];
u_char enc_packet_len[2];
u_char enc_priority;
u_char enc_lan_id[SYSTEM_ID_LEN+1];
};
struct isis_ptp_header {
u_char circuit;
u_char enc_source_id[SYSTEM_ID_LEN];
u_char enc_holding_time[2];
u_char enc_packet_len[2];
u_char loc_circuit_id;
};
#define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
#define ISIS_HEADER_SIZE (15+(SYSTEM_ID_LEN<<1))
#define ISIS_PTP_HEADER_SIZE (14+SYSTEM_ID_LEN)
#define L1_LS_PDU_HEADER_SIZE (21+SYSTEM_ID_LEN)
#define L2_LS_PDU_HEADER_SIZE L1_LS_PDU_HEADER_SIZE
#define L1_COMPLETE_SEQ_PDU_HEADER_SIZE 33
#define L2_COMPLETE_SEQ_PDU_HEADER_SIZE L1_COMPLETE_SEQ_PDU_HEADER_SIZE
void
isoclns_print(const u_char *p, u_int length, u_int caplen,
const u_char *esrc, const u_char *edst)
{
u_char pdu_type;
struct isis_header *header;
header = (struct isis_header *)p;
pdu_type = header->enc_pdu_type & PDU_TYPE_MASK;
if (caplen < 1) {
printf("[|iso-clns] ");
if (!eflag)
printf("%s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
return;
}
switch (*p) {
case NLPID_CLNS:
printf("iso clns");
if (!eflag)
(void)printf(" %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
break;
case NLPID_ESIS:
printf("iso esis");
if (!eflag)
(void)printf(" %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
esis_print(p, length);
return;
case NLPID_ISIS:
printf("iso isis");
if (!eflag) {
if(pdu_type != PTP_IIH)
(void)printf(" %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
}
(void)printf(" len=%d ", length);
if (!isis_print(p, length))
default_print_unaligned(p, caplen);
break;
case NLPID_NULLNS:
printf("iso nullns");
if (!eflag)
(void)printf(" %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
break;
default:
printf("iso clns %02x", p[0]);
if (!eflag)
(void)printf(" %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
(void)printf(" len=%d ", length);
if (caplen > 1)
default_print_unaligned(p, caplen);
break;
}
}
#define ESIS_REDIRECT 6
#define ESIS_ESH 2
#define ESIS_ISH 4
struct esis_hdr {
u_char version;
u_char reserved;
u_char type;
u_char tmo[2];
u_char cksum[2];
};
static void
esis_print(const u_char *p, u_int length)
{
const u_char *ep;
int li = p[1];
const struct esis_hdr *eh = (const struct esis_hdr *) &p[2];
u_char cksum[2];
u_char off[2];
if (length == 2) {
if (qflag)
printf(" bad pkt!");
else
printf(" no header at all!");
return;
}
ep = p + li;
if (li > length) {
if (qflag)
printf(" bad pkt!");
else
printf(" LI(%d) > PDU size (%d)!", li, length);
return;
}
if (li < sizeof(struct esis_hdr) + 2) {
if (qflag)
printf(" bad pkt!");
else {
printf(" too short for esis header %d:", li);
while (--length >= 0)
printf("%02X", *p++);
}
return;
}
switch (eh->type & 0x1f) {
case ESIS_REDIRECT:
printf(" redirect");
break;
case ESIS_ESH:
printf(" esh");
break;
case ESIS_ISH:
printf(" ish");
break;
default:
printf(" type %d", eh->type & 0x1f);
break;
}
off[0] = eh->cksum[0];
off[1] = eh->cksum[1];
if (vflag && osi_cksum(p, li, off)) {
printf(" bad cksum (got %02x%02x)",
eh->cksum[1], eh->cksum[0]);
default_print(p, length);
return;
}
if (eh->version != 1) {
printf(" unsupported version %d", eh->version);
return;
}
p += sizeof(*eh) + 2;
li -= sizeof(*eh) + 2; /* protoid * li */
switch (eh->type & 0x1f) {
case ESIS_REDIRECT: {
const u_char *dst, *snpa, *is;
dst = p; p += *p + 1;
if (p > snapend)
return;
printf("\n\t\t\t %s", isonsap_string(dst));
snpa = p; p += *p + 1;
is = p; p += *p + 1;
if (p > snapend)
return;
if (p > ep) {
printf(" [bad li]");
return;
}
if (is[0] == 0)
printf(" > %s", etheraddr_string(&snpa[1]));
else
printf(" > %s", isonsap_string(is));
li = ep - p;
break;
}
#if 0
case ESIS_ESH:
printf(" esh");
break;
#endif
case ESIS_ISH: {
const u_char *is;
is = p; p += *p + 1;
if (p > ep) {
printf(" [bad li]");
return;
}
if (p > snapend)
return;
if (!qflag)
printf("\n\t\t\t %s", isonsap_string(is));
li = ep - p;
break;
}
default:
(void)printf(" len=%d", length);
if (length && p < snapend) {
length = snapend - p;
default_print(p, length);
}
return;
}
if (vflag)
while (p < ep && li) {
int op, opli;
const u_char *q;
if (snapend - p < 2)
return;
if (li < 2) {
printf(" bad opts/li");
return;
}
op = *p++;
opli = *p++;
li -= 2;
if (opli > li) {
printf(" opt (%d) too long", op);
return;
}
li -= opli;
q = p;
p += opli;
if (snapend < p)
return;
if (op == 198 && opli == 2) {
printf(" tmo=%d", q[0] * 256 + q[1]);
continue;
}
printf (" %d:<", op);
while (--opli >= 0)
printf("%02x", *q++);
printf (">");
}
}
/*
* print_nsap
* Print out an NSAP.
*/
void
print_nsap (register const u_char *cp, register int length)
{
int i;
for (i = 0; i < length; i++) {
printf("%02x", *cp++);
if (((i & 1) == 0) && (i + 1 < length)) {
printf(".");
}
}
}
/*
* isis_print
* Decode IS-IS packets. Return 0 on error.
*
* So far, this is only smart enough to print IIH's. Someday...
*/
static int
isis_print (const u_char *p, u_int length)
{
struct isis_header *header;
struct isis_ptp_header *header_ptp;
u_char pdu_type, max_area, priority, *pptr, type, len, *tptr, tmp, alen;
u_short packet_len, holding_time;
int i;
header_ptp = (struct isis_ptp_header *)header = (struct isis_header *)p;
printf("\n\t\t\t");
/*
* Sanity checking of the header.
*/
if (header->nlpid != NLPID_ISIS) {
printf(" coding error!");
return(0);
}
if (header->version != ISIS_VERSION) {
printf(" version %d packet not supported", header->version);
return(0);
}
if ((header->id_length != SYSTEM_ID_LEN) && (header->id_length != 0)) {
printf(" system ID length of %d is not supported",
header->id_length);
return(0);
}
if ((header->fixed_len != ISIS_HEADER_SIZE) &&
(header->fixed_len != ISIS_PTP_HEADER_SIZE) &&
(header->fixed_len != L1_LS_PDU_HEADER_SIZE) &&
(header-> fixed_len != L1_COMPLETE_SEQ_PDU_HEADER_SIZE) ) {
printf(" bogus fixed header length",
header->fixed_len);
return(0);
}
pdu_type = header->enc_pdu_type & PDU_TYPE_MASK;
if ((pdu_type != L1_LAN_IIH) && (pdu_type != L2_LAN_IIH) &&
(pdu_type != PTP_IIH) &&
(pdu_type != L1_COMPLETE_SEQ_PDU) &&
(pdu_type != L2_COMPLETE_SEQ_PDU) ) {
printf(" PDU type (%d) not supported", pdu_type);
return;
}
if (header->pkt_version != ISIS_VERSION) {
printf(" version %d packet not supported", header->pkt_version);
return;
}
max_area = header->enc_max_area;
switch(max_area) {
case 0:
max_area = 3; /* silly shit */
break;
case 255:
printf(" bad packet -- 255 areas");
return(0);
default:
break;
}
switch (header->circuit) {
case 0:
printf(" PDU with circuit type 0");
return(0);
case 1:
if (pdu_type == L2_LAN_IIH) {
printf(" L2 IIH on an L1 only circuit");
return(0);
}
break;
case 2:
if (pdu_type == L1_LAN_IIH) {
printf(" L1 IIH on an L2 only circuit");
return(0);
}
break;
case 3:
break;
default:
printf(" unknown circuit type");
return(0);
}
holding_time = EXTRACT_16BITS(header->enc_holding_time);
packet_len = EXTRACT_16BITS(header->enc_packet_len);
if ((packet_len < ISIS_HEADER_SIZE) ||
(packet_len > length)) {
printf(" bogus packet length %d, real length %d", packet_len,
length);
return(0);
}
if(pdu_type != PTP_IIH)
priority = header->enc_priority & PRIORITY_MASK;
/*
* Now print the fixed header.
*/
switch (pdu_type) {
case L1_LAN_IIH:
printf(" L1 lan iih, ");
break;
case L2_LAN_IIH:
printf(" L2 lan iih, ");
break;
case PTP_IIH:
printf(" PTP iih, ");
break;
}
printf("circuit ");
switch (header->circuit) {
case 1:
printf("l1 only, ");
break;
case 2:
printf("l2 only, ");
break;
case 3:
printf("l1-l2, ");
break;
}
printf ("holding time %d ", holding_time);
printf ("\n\t\t\t source %s, length %d",
etheraddr_string(header->enc_source_id), packet_len);
if((pdu_type==L1_LAN_IIH)||(pdu_type==L2_LAN_IIH))
printf ("\n\t\t\t lan id %s(%d)", etheraddr_string(header->enc_lan_id),
header->enc_lan_id[SYSTEM_ID_LEN]);
/*
* Now print the TLV's.
*/
if(pdu_type==PTP_IIH) {
packet_len -= ISIS_PTP_HEADER_SIZE;
pptr = (char *)p + ISIS_PTP_HEADER_SIZE;
} else {
packet_len -= ISIS_HEADER_SIZE;
pptr = (char *)p + ISIS_HEADER_SIZE;
}
while (packet_len >= 2) {
if (pptr >= snapend) {
printf("\n\t\t\t packet exceeded snapshot");
return(1);
}
type = *pptr++;
len = *pptr++;
packet_len -= 2;
if (len > packet_len) {
break;
}
switch (type) {
case TLV_AREA_ADDR:
printf("\n\t\t\t area addresses");
tmp = len;
tptr = pptr;
alen = *tptr++;
while (tmp && alen < tmp) {
printf("\n\t\t\t ");
print_nsap(tptr, alen);
printf(" (%d)", alen);
tptr += alen;
tmp -= alen + 1;
alen = *tptr++;
}
break;
case TLV_ISNEIGH:
printf("\n\t\t\t neighbor addresses");
tmp = len;
tptr = pptr;
while (tmp >= sizeof(struct ether_addr)) {
printf("\n\t\t\t %s", etheraddr_string(tptr));
tmp -= sizeof(struct ether_addr);
tptr += sizeof(struct ether_addr);
}
break;
case TLV_PADDING:
printf("\n\t\t\t padding for %d bytes", len);
break;
case TLV_AUTHENT:
printf("\n\t\t\t authentication data");
default_print(pptr, len);
break;
case TLV_PTP_ADJ:
printf("\n\t\t\t PTP adjacency status %s",
isis_ptp_adjancey_values[*pptr].name);
break;
case TLV_PROTOCOLS:
printf("\n\t\t\t Supports protocols %s", (len>1)? "are":"is");
for(i=0;i<len;i++)
printf(" %02X", (u_char)*(pptr+i));
break;
case TLV_IPADDR:
printf("\n\t\t\t IP address: %s", ipaddr_string(pptr));
break;
default:
printf("\n\t\t\t unknown TLV, type %d, length %d", type, len);
break;
}
pptr += len;
packet_len -= len;
}
if (packet_len != 0) {
printf("\n\t\t\t %d straggler bytes", packet_len);
}
return(1);
}
/*
* Verify the checksum. See 8473-1, Appendix C, section C.4.
*/
static int
osi_cksum(register const u_char *p, register int len, u_char *off)
{
int32_t c0 = 0, c1 = 0;
if ((off[0] == 0) && (off[1] == 0))
return 0;
while (--len >= 0) {
c0 += *p++;
c0 %= 255;
c1 += c0;
c1 %= 255;
}
return (c0 | c1);
}
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