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freebsd/contrib/tcpdump/print-isoclns.c
Bill Fenner 0e0def197a Merge tcpdump 3.7.2
2003-03-02 08:25:48 +00:00

1588 lines
42 KiB
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
*
* Extensively modified by Hannes Gredler (hannes@juniper.net) for more
* complete IS-IS support.
*
* $FreeBSD$
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.36.2.2 2002/06/29 04:28:44 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "ether.h"
#include "extract.h"
#define NLPID_CLNS 129 /* 0x81 */
#define NLPID_ESIS 130 /* 0x82 */
#define NLPID_ISIS 131 /* 0x83 */
#define NLPID_IP6 0x8e
#define NLPID_IP 0xcc
#define NLPID_NULLNS 0
/*
* IS-IS is defined in ISO 10589. Look there for protocol definitions.
*/
#define SYSTEM_ID_LEN ETHER_ADDR_LEN
#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_LSP 18
#define L2_LSP 20
#define L1_CSNP 24
#define L2_CSNP 25
#define L1_PSNP 26
#define L2_PSNP 27
/*
* 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_AUTH 10
#define TLV_CHECKSUM 12
#define TLV_EXT_IS_REACH 22
#define TLV_IP_REACH 128
#define TLV_PROTOCOLS 129
#define TLV_IP_REACH_EXT 130
#define TLV_IDRP_INFO 131
#define TLV_IPADDR 132
#define TLV_IPAUTH 133
#define TLV_TE_ROUTER_ID 134
#define TLV_EXT_IP_REACH 135
#define TLV_HOSTNAME 137
#define TLV_RESTART_SIGNALING 211
#define TLV_MT_IS_REACH 222
#define TLV_MT_SUPPORTED 229
#define TLV_IP6ADDR 232
#define TLV_MT_REACH 235
#define TLV_IP6_REACH 236
#define TLV_PTP_ADJ 240
#define SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3
#define SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6
#define SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8
#define SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9
#define SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10
#define SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11
#define SUBTLV_EXT_IS_REACH_TE_METRIC 18
#define SUBTLV_AUTH_SIMPLE 1
#define SUBTLV_AUTH_MD5 54
#define ISIS_MASK_LEVEL_BITS(x) ((x)&0x1)
#define ISIS_MASK_LSP_OL_BIT(x) ((x)&0x4)
#define ISIS_MASK_LSP_ISTYPE_BITS(x) ((x)&0x3)
#define ISIS_MASK_LSP_PARTITION_BIT(x) ((x)&0x80)
#define ISIS_MASK_LSP_ATT_BITS(x) ((x)&0x78)
#define ISIS_MASK_LSP_ATT_ERROR_BIT(x) ((x)&0x40)
#define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) ((x)&0x20)
#define ISIS_MASK_LSP_ATT_DELAY_BIT(x) ((x)&0x10)
#define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) ((x)&0x8)
#define ISIS_MASK_TLV_EXT_IP_UPDOWN(x) ((x)&0x80)
#define ISIS_MASK_TLV_EXT_IP_SUBTLV(x) ((x)&0x40)
#define ISIS_MASK_TLV_IP6_UPDOWN(x) ((x)&0x80)
#define ISIS_MASK_TLV_IP6_IE(x) ((x)&0x40)
#define ISIS_MASK_TLV_IP6_SUBTLV(x) ((x)&0x20)
#define ISIS_MASK_RESTART_RR(x) ((x)&0x1)
#define ISIS_MASK_RESTART_RA(x) ((x)&0x2)
#define ISIS_LSP_TLV_METRIC_SUPPORTED(x) ((x)&0x80)
#define ISIS_LSP_TLV_METRIC_IE(x) ((x)&0x40)
#define ISIS_LSP_TLV_METRIC_UPDOWN(x) ((x)&0x80)
#define ISIS_LSP_TLV_METRIC_VALUE(x) ((x)&0x3f)
#define ISIS_LSP_TYPE_UNUSED0 0
#define ISIS_LSP_TYPE_LEVEL_1 1
#define ISIS_LSP_TYPE_UNUSED2 2
#define ISIS_LSP_TYPE_LEVEL_2 3
static struct tok isis_lsp_istype_values[] = {
{ ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"},
{ ISIS_LSP_TYPE_LEVEL_1, "L1 IS"},
{ ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"},
{ ISIS_LSP_TYPE_LEVEL_2, "L1L2 IS"},
{ 0, NULL }
};
static struct tok isis_nlpid_values[] = {
{ NLPID_CLNS, "CLNS"},
{ NLPID_IP, "IPv4"},
{ NLPID_IP6, "IPv6"},
{ 0, "unknown" }
};
/*
* 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 *, u_int, u_char *);
static void esis_print(const u_char *, u_int);
static int isis_print(const u_char *, u_int);
static struct tok isis_ptp_adjancey_values[] = {
{ ISIS_PTP_ADJ_UP, "Up" },
{ ISIS_PTP_ADJ_INIT, "Initializing" },
{ ISIS_PTP_ADJ_DOWN, "Down" }
};
struct isis_tlv_ptp_adj {
u_char adjacency_state;
u_char ext_local_circuit_id[4];
u_char neighbor_sysid[SYSTEM_ID_LEN];
u_char neighbor_ext_local_circuit_id[4];
};
struct isis_tlv_ip_reach {
u_char metric_default;
u_char metric_delay;
u_char metric_expense;
u_char metric_error;
u_char prefix[4];
u_char mask[4];
};
struct isis_tlv_is_reach {
u_char metric_default;
u_char metric_delay;
u_char metric_expense;
u_char metric_error;
u_char neighbor_nodeid[SYSTEM_ID_LEN+1];
};
struct isis_common_header {
u_char nlpid;
u_char fixed_len;
u_char version; /* Protocol version? */
u_char id_length;
u_char pdu_type; /* 3 MSbs are reserved */
u_char pkt_version; /* Packet format version? */
u_char reserved;
u_char max_area;
};
struct isis_iih_lan_header {
u_char circuit_type;
u_char source_id[SYSTEM_ID_LEN];
u_char holding_time[2];
u_char pdu_len[2];
u_char priority;
u_char lan_id[SYSTEM_ID_LEN+1];
};
struct isis_iih_ptp_header {
u_char circuit_type;
u_char source_id[SYSTEM_ID_LEN];
u_char holding_time[2];
u_char pdu_len[2];
u_char circuit_id;
};
struct isis_lsp_header {
u_char pdu_len[2];
u_char remaining_lifetime[2];
u_char lsp_id[SYSTEM_ID_LEN+2];
u_char sequence_number[4];
u_char checksum[2];
u_char typeblock;
};
struct isis_csnp_header {
u_char pdu_len[2];
u_char source_id[SYSTEM_ID_LEN+1];
u_char start_lsp_id[SYSTEM_ID_LEN+2];
u_char end_lsp_id[SYSTEM_ID_LEN+2];
};
struct isis_psnp_header {
u_char pdu_len[2];
u_char source_id[SYSTEM_ID_LEN+1];
};
struct isis_tlv_lsp {
u_char remaining_lifetime[2];
u_char lsp_id[SYSTEM_ID_LEN+2];
u_char sequence_number[4];
u_char checksum[2];
};
#define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header))
#define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header))
#define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header))
#define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header))
#define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
#define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header))
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;
const struct isis_common_header *header;
header = (const struct isis_common_header *)p;
pdu_type = header->pdu_type & PDU_TYPE_MASK;
if (caplen < 1) {
printf("[|iso-clns] ");
if (!eflag && esrc != NULL && edst != NULL)
printf("%s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
return;
}
switch (*p) {
case NLPID_CLNS:
(void)printf("CLNS(%d)", length);
if (!eflag && esrc != NULL && edst != NULL)
(void)printf(", %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
break;
case NLPID_ESIS:
(void)printf("ESIS");
if (!eflag && esrc != NULL && edst != NULL)
(void)printf(", %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
esis_print(p, length);
return;
case NLPID_ISIS:
(void)printf("ISIS(%d)", length);
if (!eflag && esrc != NULL && edst != NULL)
(void)printf(", %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
if (!isis_print(p, length))
default_print_unaligned(p, caplen);
break;
case NLPID_NULLNS:
(void)printf("ISO NULLNS(%d)", length);
if (!eflag && esrc != NULL && edst != NULL)
(void)printf(", %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
break;
default:
(void)printf("CLNS %02x(%d)", p[0], length);
if (!eflag && esrc != NULL && edst != NULL)
(void)printf(", %s > %s",
etheraddr_string(esrc),
etheraddr_string(edst));
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;
u_int li;
const struct esis_hdr *eh;
u_char off[2];
if (length <= 2) {
if (qflag)
printf(" bad pkt!");
else
printf(" no header at all!");
return;
}
li = p[1];
eh = (const struct esis_hdr *) &p[2];
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) {
u_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.
*/
static int
print_nsap(register const u_char *cp, register int length)
{
int i;
for (i = 0; i < length; i++) {
if (!TTEST2(*cp, 1))
return (0);
printf("%02x", *cp++);
if (((i & 1) == 0) && (i + 1 < length)) {
printf(".");
}
}
return (1);
}
static int
isis_print_sysid(const u_char *cp)
{
int i;
for (i = 1; i <= 6; i++) {
if (!TTEST2(*cp, 1))
return (0);
printf("%02x", *cp++);
if ((i==2)^(i==4)) {
printf(".");
}
}
return (1);
}
static int
isis_print_nodeid(const u_char *cp)
{
int i;
for (i = 1; i <= 7; i++) {
if (!TTEST2(*cp, 1))
return (0);
printf("%02x", *cp++);
if ((i & 1) == 0) {
printf(".");
}
}
return (1);
}
static void
isis_print_lspid(const u_char *cp)
{
int i;
for (i = 1; i <= 7; i++) {
printf("%02x", *cp++);
if ((i & 1) == 0)
printf(".");
}
printf("-%02x", *cp);
}
static int
isis_print_tlv_ip_reach (const u_char *cp, int length)
{
u_int bitmasks[33] = {
0x00000000,
0x80000000, 0xc0000000, 0xe0000000, 0xf0000000,
0xf8000000, 0xfc000000, 0xfe000000, 0xff000000,
0xff800000, 0xffc00000, 0xffe00000, 0xfff00000,
0xfff80000, 0xfffc0000, 0xfffe0000, 0xffff0000,
0xffff8000, 0xffffc000, 0xffffe000, 0xfffff000,
0xfffff800, 0xfffffc00, 0xfffffe00, 0xffffff00,
0xffffff80, 0xffffffc0, 0xffffffe0, 0xfffffff0,
0xfffffff8, 0xfffffffc, 0xfffffffe, 0xffffffff
};
u_int mask;
int prefix_len;
const struct isis_tlv_ip_reach *tlv_ip_reach;
tlv_ip_reach = (const struct isis_tlv_ip_reach *)cp;
while (length > 0) {
if (length < sizeof(*tlv_ip_reach)) {
printf("short IP reachability (%d vs %lu)", length,
(unsigned long)sizeof(*tlv_ip_reach));
return (0);
}
if (!TTEST(*tlv_ip_reach))
return (0);
mask = EXTRACT_32BITS(tlv_ip_reach->mask);
prefix_len = 0;
while (prefix_len <= 33) {
if (bitmasks[prefix_len++] == mask) {
prefix_len--;
break;
}
}
/*
* 34 indicates no match -> must be a discontiguous netmask
* lets dump the mask, otherwise print the prefix_len
*/
if (prefix_len == 34)
printf("\n\t\t\tIPv4 prefix: %u.%u.%u.%u mask %u.%u.%u.%u",
(tlv_ip_reach->prefix)[0],
(tlv_ip_reach->prefix)[1],
(tlv_ip_reach->prefix)[2],
(tlv_ip_reach->prefix)[3],
(tlv_ip_reach->mask)[0], (tlv_ip_reach->mask)[1],
(tlv_ip_reach->mask)[2], (tlv_ip_reach->mask)[3]);
else
printf("\n\t\t\tIPv4 prefix: %u.%u.%u.%u/%u",
(tlv_ip_reach->prefix)[0],
(tlv_ip_reach->prefix)[1],
(tlv_ip_reach->prefix)[2],
(tlv_ip_reach->prefix)[3], prefix_len);
printf("\n\t\t\t Default Metric: %02d, %s, Distribution: %s",
ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->metric_default),
ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->metric_default) ? "External" : "Internal",
ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->metric_default) ? "down" : "up");
if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->metric_delay))
printf("\n\t\t\t Delay Metric: %02d, %s",
ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->metric_delay),
ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->metric_delay) ? "External" : "Internal");
if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->metric_expense))
printf("\n\t\t\t Expense Metric: %02d, %s",
ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->metric_expense),
ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->metric_expense) ? "External" : "Internal");
if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->metric_error))
printf("\n\t\t\t Error Metric: %02d, %s",
ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->metric_error),
ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->metric_error) ? "External" : "Internal");
length -= sizeof(struct isis_tlv_ip_reach);
tlv_ip_reach++;
}
return (1);
}
/*
* isis_print
* Decode IS-IS packets. Return 0 on error.
*/
static int isis_print (const u_char *p, u_int length)
{
const struct isis_common_header *header;
const struct isis_iih_lan_header *header_iih_lan;
const struct isis_iih_ptp_header *header_iih_ptp;
const struct isis_lsp_header *header_lsp;
const struct isis_csnp_header *header_csnp;
const struct isis_psnp_header *header_psnp;
const struct isis_tlv_lsp *tlv_lsp;
const struct isis_tlv_ptp_adj *tlv_ptp_adj;
const struct isis_tlv_is_reach *tlv_is_reach;
u_char pdu_type, max_area, type, len, tmp, alen, subl, subt, tslen, ttslen;
const u_char *optr, *pptr, *tptr;
u_char subtlv_len;
u_short packet_len,pdu_len;
u_int i,j,bit_length,byte_length,metric;
u_char prefix[4]; /* copy buffer for ipv4 prefixes */
#ifdef INET6
u_char prefix6[16]; /* copy buffer for ipv6 prefixes */
#endif
u_char off[2];
float bw; /* copy buffer for several subTLVs of the extended IS reachability TLV */
packet_len=length;
optr = p; /* initialize the _o_riginal pointer - need it for parsing the checksum TLV */
header = (const struct isis_common_header *)p;
TCHECK(*header);
pptr = p+(ISIS_COMMON_HEADER_SIZE);
header_iih_lan = (const struct isis_iih_lan_header *)pptr;
header_iih_ptp = (const struct isis_iih_ptp_header *)pptr;
header_lsp = (const struct isis_lsp_header *)pptr;
header_csnp = (const struct isis_csnp_header *)pptr;
header_psnp = (const struct isis_psnp_header *)pptr;
/*
* 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->pkt_version != ISIS_VERSION) {
printf(", version %d packet not supported", header->pkt_version);
return (0);
}
max_area = header->max_area;
switch(max_area) {
case 0:
max_area = 3; /* silly shit */
break;
case 255:
printf(", bad packet -- 255 areas");
return (0);
default:
break;
}
printf(", hlen: %u, v: %u, sys-id-len: 6 (0), max-area: %u (%u)",
header->fixed_len,
header->pkt_version,
max_area,
header->max_area);
pdu_type=header->pdu_type;
switch (pdu_type) {
case L1_LAN_IIH:
case L2_LAN_IIH:
if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) {
printf(", bogus fixed header length %u should be %lu",
header->fixed_len, (unsigned long)ISIS_IIH_LAN_HEADER_SIZE);
return (0);
}
pdu_len=EXTRACT_16BITS(header_iih_lan->pdu_len);
if (packet_len>pdu_len) {
packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
length=pdu_len;
}
printf(", L%s Lan IIH (%u)",
ISIS_MASK_LEVEL_BITS(pdu_type) ? "1" : "2",
pdu_len);
TCHECK(*header_iih_lan);
printf("\n\t\t source-id: ");
isis_print_sysid(header_iih_lan->source_id);
printf(", holding time: %us",EXTRACT_16BITS(header_iih_lan->holding_time));
switch(header_iih_lan->circuit_type) {
case 1:
printf(", Level 1 only");
break;
case 2:
printf(", Level 2 only");
break;
case 3:
printf(", Level 1, Level 2");
break;
default:
printf(", unknown 0x%02x", header_iih_lan->circuit_type);
break;
}
printf("\n\t\t lan-id: ");
isis_print_nodeid(header_iih_lan->lan_id);
printf(", Priority: %u",(header_iih_lan->priority) & PRIORITY_MASK);
packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE);
break;
case PTP_IIH:
if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) {
printf(", bogus fixed header length %u should be %lu",
header->fixed_len, (unsigned long)ISIS_IIH_PTP_HEADER_SIZE);
return (0);
}
pdu_len=EXTRACT_16BITS(header_iih_ptp->pdu_len);
if (packet_len>pdu_len) {
packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
length=pdu_len;
}
printf(", PTP IIH (%u)",pdu_len);
TCHECK(*header_iih_ptp);
printf("\n\t\t source-id: ");
isis_print_sysid(header_iih_ptp->source_id);
printf(", holding time: %us",EXTRACT_16BITS(header_iih_ptp->holding_time));
printf(", circuit-id: 0x%02x", header_iih_ptp->circuit_id);
switch(header_iih_ptp->circuit_type) {
case 1:
printf(", Level 1 only");
break;
case 2:
printf(", Level 2 only");
break;
case 3:
printf(", Level 1, Level 2");
break;
default:
printf(", unknown 0x%02x", header_iih_ptp->circuit_type);
break;
}
packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE);
break;
case L1_LSP:
case L2_LSP:
if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) {
printf(", bogus fixed header length %u should be %lu",
header->fixed_len, (unsigned long)ISIS_LSP_HEADER_SIZE);
return (0);
}
pdu_len=EXTRACT_16BITS(header_lsp->pdu_len);
if (packet_len>pdu_len) {
packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
length=pdu_len;
}
if (pdu_type == L1_LSP)
printf(", L1 LSP (%u)",pdu_len);
else if (pdu_type == L2_LSP)
printf(", L2 LSP (%u)",pdu_len);
TCHECK(*header_lsp);
printf("\n\t\t lsp-id: ");
isis_print_lspid(header_lsp->lsp_id);
printf(", sequence number: 0x%08x",EXTRACT_32BITS(header_lsp->sequence_number));
printf(", lifetime: %5us",EXTRACT_16BITS(header_lsp->remaining_lifetime));
printf("\n\t\t checksum: 0x%04x",EXTRACT_16BITS(header_lsp->checksum));
printf(", %s", ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : "");
if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) {
printf("%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : "");
printf("%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : "");
printf("%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : "");
printf("%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : "");
printf("ATT bit set, ");
}
printf("%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : "");
printf("%s", tok2str(isis_lsp_istype_values,"Unknown(0x%x)",ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)));
packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
break;
case L1_CSNP:
case L2_CSNP:
if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) {
printf(", bogus fixed header length %u should be %lu",
header->fixed_len, (unsigned long)ISIS_CSNP_HEADER_SIZE);
return (0);
}
pdu_len=EXTRACT_16BITS(header_csnp->pdu_len);
if (packet_len>pdu_len) {
packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
length=pdu_len;
}
printf(", L%s CSNP (%u)", ISIS_MASK_LEVEL_BITS(pdu_type) ? "2" : "1", pdu_len);
TCHECK(*header_csnp);
printf("\n\t\t source-id: ");
isis_print_nodeid(header_csnp->source_id);
printf("\n\t\t start lsp-id: ");
isis_print_lspid(header_csnp->start_lsp_id);
printf("\n\t\t end lsp-id: ");
isis_print_lspid(header_csnp->end_lsp_id);
packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE);
break;
case L1_PSNP:
case L2_PSNP:
if (header->fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) {
printf("- bogus fixed header length %u should be %lu",
header->fixed_len, (unsigned long)ISIS_PSNP_HEADER_SIZE);
return (0);
}
pdu_len=EXTRACT_16BITS(header_psnp->pdu_len);
if (packet_len>pdu_len) {
packet_len=pdu_len; /* do TLV decoding as long as it makes sense */
length=pdu_len;
}
printf(", L%s PSNP (%u)", ISIS_MASK_LEVEL_BITS(pdu_type) ? "2" : "1", pdu_len);
TCHECK(*header_psnp);
printf("\n\t\t source-id: ");
isis_print_nodeid(header_psnp->source_id);
packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
break;
default:
printf(", PDU type (0x%02x) not supported", pdu_type);
return (1);
}
/*
* Now print the TLV's.
*/
while (packet_len >= 2) {
if (pptr == snapend) {
return (1);
}
if (!TTEST2(*pptr, 2)) {
printf("\n\t\t\t packet exceeded snapshot (%ld) bytes",
(long)(pptr-snapend));
return (1);
}
type = *pptr++;
len = *pptr++;
packet_len -= 2;
if (len > packet_len) {
break;
}
printf("\n\t\t ");
switch (type) {
case TLV_AREA_ADDR:
printf("Area address(es) (%u)",len);
tmp = len;
tptr = pptr;
if (!TTEST2(*tptr, 1))
goto trunctlv;
alen = *tptr++;
while (tmp && alen < tmp) {
printf("\n\t\t\tArea address (%u): ",alen);
if (!print_nsap(tptr, alen))
return (1);
tptr += alen;
tmp -= alen + 1;
if (tmp==0) /* if this is the last area address do not attemt a boundary check */
break;
if (!TTEST2(*tptr, 1))
goto trunctlv;
alen = *tptr++;
}
break;
case TLV_ISNEIGH:
printf("IS Neighbor(s) (%u)",len);
tmp = len;
tptr = pptr;
while (tmp >= ETHER_ADDR_LEN) {
printf("\n\t\t\tIS Neighbor: ");
if (!isis_print_sysid(tptr))
return (1);
tmp -= ETHER_ADDR_LEN;
tptr += ETHER_ADDR_LEN;
}
break;
case TLV_PADDING:
printf("Padding (%u)", len);
break;
case TLV_MT_IS_REACH:
printf("Multi Topology IS Reachability (%u)",len);
tptr=pptr;
tmp=len;
while (tmp>0) {
printf("\n\t\t\t");
if (!TTEST2(*tptr, 2))
goto trunctlv;
switch(EXTRACT_16BITS(tptr)&0x0fff) {
case 0:
printf("IPv4 unicast");
break;
case 1:
printf("In-Band Management");
break;
case 2:
printf("IPv6 unicast");
break;
case 3:
printf("Multicast");
break;
case 4095:
printf("Development, Experimental or Proprietary");
break;
default:
printf("Reserved for IETF Consensus");
break;
}
printf(" Topology (0x%03x)",EXTRACT_16BITS(tptr)&0x0fff);
tptr+=2;
printf("\n\t\t\t IS Neighbor: ");
if (!isis_print_nodeid(tptr))
return (1);
tptr+=(SYSTEM_ID_LEN+1);
if (!TTEST2(*tptr, 3))
goto trunctlv;
printf(", Metric: %d",EXTRACT_24BITS(tptr));
tptr+=3;
if (!TTEST2(*tptr, 1))
goto trunctlv;
tslen=*(tptr++);
printf(", %ssub-TLVs present",tslen ? "" : "no ");
tptr+=tslen;
tmp-=(13+tslen);
}
break;
case TLV_EXT_IS_REACH:
printf("Extended IS Reachability (%u)",len);
tptr=pptr;
tmp=len;
while (tmp>0) {
printf("\n\t\t\tIS Neighbor: ");
if (!isis_print_nodeid(tptr))
return (1);
tptr+=(SYSTEM_ID_LEN+1);
if (!TTEST2(*tptr, 3))
goto trunctlv;
printf(", Metric: %d",EXTRACT_24BITS(tptr));
tptr+=3;
if (!TTEST2(*tptr, 1))
goto trunctlv;
tslen=*(tptr++);
printf(", %ssub-TLVs present",tslen ? "" : "no ");
if (tslen) {
printf(" (%u)",tslen);
ttslen=tslen;
while (ttslen>0) {
if (!TTEST2(*tptr,2))
goto trunctlv;
printf("\n\t\t\t ");
subt=*(tptr++);
subl=*(tptr++);
switch(subt) {
case SUBTLV_EXT_IS_REACH_ADMIN_GROUP:
printf("Administrative groups: 0x%08x", EXTRACT_32BITS(tptr));
break;
case SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
if (!TTEST2(*tptr,4))
goto trunctlv;
j = EXTRACT_32BITS(tptr);
memcpy (&bw, &j, 4);
printf("Maximum link bandwidth : %.3f Mbps",
bw*8/1000000 );
break;
case SUBTLV_EXT_IS_REACH_RESERVABLE_BW :
if (!TTEST2(*tptr,4))
goto trunctlv;
j = EXTRACT_32BITS(tptr);
memcpy (&bw, &j, 4);
printf("Reservable link bandwidth: %.3f Mbps",
bw*8/1000000 );
break;
case SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
printf("Unreserved bandwidth:");
for (i = 0; i < 8; i++) {
if (!TTEST2(*tptr,4))
goto trunctlv;
j = EXTRACT_32BITS(tptr);
memcpy (&bw, &j, 4);
printf("\n\t\t\t priority level %d: %.3f Mbps",
i, bw*8/1000000 );
tptr+=4;
}
tptr-=32;
break;
case SUBTLV_EXT_IS_REACH_TE_METRIC:
if (!TTEST2(*tptr,3))
goto trunctlv;
printf("Traffic Engineering Metric: %d", EXTRACT_24BITS(tptr));
break;
case SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("IPv4 interface address: %s", ipaddr_string(tptr));
break;
case SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("IPv4 neighbor address: %s", ipaddr_string(tptr));
break;
case 250:
case 251:
case 252:
case 253:
case 254:
printf("Reserved for cisco specific extensions, type %d, length %d", subt, subl);
break;
case 255:
printf("Reserved for future expansion, type %d, length %d", subt, subl);
break;
default:
printf("unknown subTLV, type %d, length %d", subt, subl);
}
tptr+=subl;
ttslen-=(subl+2);
}
}
tptr+=tslen;
tmp-=(11+tslen);
}
break;
case TLV_IS_REACH:
printf("IS Reachability (%u)",len);
tptr=pptr;
if (!TTEST2(*tptr,1)) /* check if there is one byte left to read out the virtual flag */
goto trunctlv;
switch (*tptr) {
case 0:
printf("\n\t\t\tIsNotVirtual");
break;
case 1:
printf("\n\t\t\tIsVirtual");
break;
default:
printf("\n\t\t\tbogus virtual flag 0x%02x",(*tptr));
break;
}
tptr++;
tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
tmp = len;
while (tmp >= sizeof(struct isis_tlv_is_reach)) {
if (!TTEST(*tlv_is_reach))
goto trunctlv;
printf("\n\t\t\tIS Neighbor: ");
isis_print_nodeid(tlv_is_reach->neighbor_nodeid);
printf(", Default Metric: %d, %s",
ISIS_LSP_TLV_METRIC_VALUE(tlv_is_reach->metric_default),
ISIS_LSP_TLV_METRIC_IE(tlv_is_reach->metric_default) ? "External" : "Internal");
if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_is_reach->metric_delay))
printf("\n\t\t\t Delay Metric: %d, %s",
ISIS_LSP_TLV_METRIC_VALUE(tlv_is_reach->metric_delay),
ISIS_LSP_TLV_METRIC_IE(tlv_is_reach->metric_delay) ? "External" : "Internal");
if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_is_reach->metric_expense))
printf("\n\t\t\t Expense Metric: %d, %s",
ISIS_LSP_TLV_METRIC_VALUE(tlv_is_reach->metric_expense),
ISIS_LSP_TLV_METRIC_IE(tlv_is_reach->metric_expense) ? "External" : "Internal");
if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_is_reach->metric_error))
printf("\n\t\t\t Error Metric: %d, %s",
ISIS_LSP_TLV_METRIC_VALUE(tlv_is_reach->metric_error),
ISIS_LSP_TLV_METRIC_IE(tlv_is_reach->metric_error) ? "External" : "Internal");
tmp -= sizeof(struct isis_tlv_is_reach);
tlv_is_reach++;
}
break;
case TLV_IP_REACH:
printf("IP Internal reachability (%u)",len);
if (!isis_print_tlv_ip_reach(pptr, len))
return (1);
break;
case TLV_IP_REACH_EXT:
printf("IP External reachability (%u)",len);
if (!isis_print_tlv_ip_reach(pptr, len))
return (1);
break;
case TLV_EXT_IP_REACH:
printf("Extended IP reachability (%u)",len);
i=len;
tptr=pptr;
while (i>0) {
memset (prefix, 0, 4);
if (!TTEST2(*tptr, 4))
return (1);
metric = EXTRACT_32BITS(tptr);
tptr+=4;
if (!TTEST2(*tptr, 1))
return (1);
j=*(tptr);
bit_length = (*(tptr)++&0x3f);
byte_length = (bit_length + 7) / 8;
if (!TTEST2(*tptr, byte_length))
return (1);
memcpy(prefix,tptr,byte_length);
printf("\n\t\t\tIPv4 prefix: %u.%u.%u.%u/%d",
prefix[0],
prefix[1],
prefix[2],
prefix[3],
bit_length);
printf("\n\t\t\t Metric: %u, Distribution: %s",
metric,
ISIS_MASK_TLV_EXT_IP_UPDOWN(j) ? "down" : "up");
printf(", %ssub-TLVs present",
ISIS_MASK_TLV_EXT_IP_SUBTLV(j) ? "" : "no ");
if (ISIS_MASK_TLV_EXT_IP_SUBTLV(j)) {
if (!TTEST2(*tptr, 1))
return (1);
subtlv_len = *tptr;
printf(" (%u)",subtlv_len); /* no subTLV decoder supported - just print out subTLV length */
i -= subtlv_len;
tptr += subtlv_len + 1;
}
i-=(5+byte_length);
tptr+=byte_length;
}
break;
#ifdef INET6
case TLV_IP6_REACH:
printf("IP6 reachability (%u)",len);
i=len;
tptr=pptr;
while (i>0) {
if (!TTEST2(*tptr, 4))
return (1);
metric = EXTRACT_32BITS(tptr);
tptr+=4;
if (!TTEST2(*tptr, 2))
return (1);
j=*(tptr++);
bit_length = (*(tptr)++);
byte_length = (bit_length + 7) / 8;
if (!TTEST2(*tptr, byte_length))
return (1);
memset(prefix6, 0, 16);
memcpy(prefix6,tptr,byte_length);
printf("\n\t\t\tIPv6 prefix: %s/%u",
ip6addr_string(prefix6),
bit_length);
printf("\n\t\t\t Metric: %u, %s, Distribution: %s, %ssub-TLVs present",
metric,
ISIS_MASK_TLV_IP6_IE(j) ? "External" : "Internal",
ISIS_MASK_TLV_IP6_UPDOWN(j) ? "down" : "up",
ISIS_MASK_TLV_IP6_SUBTLV(j) ? "" : "no ");
if (ISIS_MASK_TLV_IP6_SUBTLV(j)) {
if (!TTEST2(*tptr, 1))
return (1);
printf(" (%u)",*tptr); /* no subTLV decoder supported - just print out subTLV length */
i-=*tptr;
tptr+=*tptr++;
}
i-=(6+byte_length);
tptr+=byte_length;
}
break;
#endif
#ifdef INET6
case TLV_IP6ADDR:
printf("IPv6 Interface address(es) (%u)",len);
i=len;
tptr=pptr;
while (i>0) {
if (!TTEST2(*tptr, 16))
goto trunctlv;
printf("\n\t\t\tIPv6 interface address: %s",
ip6addr_string(tptr));
tptr += 16;
i -= 16;
}
break;
#endif
case TLV_AUTH:
if (!TTEST2(*pptr, 1))
goto trunctlv;
printf("Authentication (%u)",len);
if (*pptr==SUBTLV_AUTH_SIMPLE) {
printf("\n\t\t\tsimple text password: ");
for(i=1;i<len;i++) {
if (!TTEST2(*(pptr+i), 1))
goto trunctlv;
printf("%c",*(pptr+i));
}
}
if (!TTEST2(*pptr, 1))
goto trunctlv;
if (*pptr==SUBTLV_AUTH_MD5) {
printf("\n\t\t\tMD5 password: ");
for(i=1;i<len;i++) {
if (!TTEST2(*(pptr+i), 1))
goto trunctlv;
printf("%02x",*(pptr+i));
}
}
break;
case TLV_PTP_ADJ:
printf("Point-to-point Adjacency State (%u)",len);
tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)pptr;
i=len;
if(i>=1) {
if (!TTEST2(*pptr, 1))
goto trunctlv;
printf("\n\t\t\tAdjacency State: %s",
tok2str(isis_ptp_adjancey_values, "#0x%x", *pptr));
i--;
}
if(i>=4) {
if (!TTEST2(tlv_ptp_adj->ext_local_circuit_id, 4))
goto trunctlv;
printf("\n\t\t\tExtended Local circuit ID: 0x%08x",
EXTRACT_32BITS(tlv_ptp_adj->ext_local_circuit_id));
i-=4;
}
if(i>=6) {
if (!TTEST2(tlv_ptp_adj->neighbor_sysid, 6))
goto trunctlv;
printf("\n\t\t\tNeighbor SystemID: ");
isis_print_sysid(tlv_ptp_adj->neighbor_sysid);
i-=6;
}
if(i>=4) {
if (!TTEST2(tlv_ptp_adj->neighbor_ext_local_circuit_id, 4))
goto trunctlv;
printf("\n\t\t\tNeighbor Extended Local circuit ID: 0x%08x",
EXTRACT_32BITS(tlv_ptp_adj->neighbor_ext_local_circuit_id));
}
break;
case TLV_PROTOCOLS:
printf("Protocols supported (%u)", len);
printf("\n\t\t\tNLPID(s): ");
for (i = 0; i < len; i++) {
if (!TTEST2(*(pptr+i), 1))
goto trunctlv;
printf("%s (0x%02x)",tok2str(isis_nlpid_values, "Unknown", *(pptr+i)),*(pptr+i));
if (i<len-1)
printf(", ");
}
break;
case TLV_TE_ROUTER_ID:
printf("Traffic Engineering Router ID (%u)",len);
if (!TTEST2(*pptr, 4))
goto trunctlv;
printf("\n\t\t\tTraffic Engineering Router ID: %s", ipaddr_string(pptr));
break;
case TLV_IPADDR:
printf("IPv4 Interface address(es) (%u)",len);
i=len;
tptr=pptr;
while (i>0) {
if (!TTEST2(*tptr, 4))
goto trunctlv;
printf("\n\t\t\tIPv4 interface address: %s", ipaddr_string(tptr));
tptr += 4;
i -= 4;
}
break;
case TLV_HOSTNAME:
printf("Hostname (%u)", len);
printf("\n\t\t\tHostname: ");
for(i = 0; i < len; i++) {
if (!TTEST2(*(pptr+i), 1))
goto trunctlv;
printf("%c",*(pptr+i));
}
break;
case TLV_LSP:
tlv_lsp = (const struct isis_tlv_lsp *)pptr;
printf("LSP entries (%u)", len);
i=0;
while(i<len) {
printf("\n\t\t\tlsp-id: ");
if (!isis_print_nodeid(tlv_lsp->lsp_id))
return (1);
if (!TTEST((tlv_lsp->lsp_id)[SYSTEM_ID_LEN+1]))
goto trunctlv;
printf("-%02x",(tlv_lsp->lsp_id)[SYSTEM_ID_LEN+1]);
if (!TTEST2(tlv_lsp->sequence_number, 4))
goto trunctlv;
printf("\n\t\t\t sequence number: 0x%08x",EXTRACT_32BITS(tlv_lsp->sequence_number));
if (!TTEST2(tlv_lsp->remaining_lifetime, 2))
goto trunctlv;
printf("\n\t\t\t Remaining lifetime: %5ds",EXTRACT_16BITS(tlv_lsp->remaining_lifetime));
if (!TTEST2(tlv_lsp->checksum, 2))
goto trunctlv;
printf("\n\t\t\t checksum: 0x%04x",EXTRACT_16BITS(tlv_lsp->checksum));
i+=sizeof(struct isis_tlv_lsp);
tlv_lsp++;
}
break;
case TLV_CHECKSUM:
if (!TTEST2(*pptr, 2))
goto trunctlv;
printf("Checksum (%u)", len);
printf("\n\t\t\tchecksum: 0x%04x",
EXTRACT_16BITS(pptr));
if (osi_cksum(optr, length, off))
printf(" (incorrect)");
else
printf(" (correct)");
break;
case TLV_MT_SUPPORTED:
printf("Multi Topology (%u)",len);
i=len;
tptr=pptr;
while (i>1) {
/* length can only be a multiple of 2, otherwise there is
something broken -> so decode down until length is 1 */
if (i!=1) {
if (!TTEST2(*tptr, 2))
goto trunctlv;
printf("\n\t\t\t");
switch(EXTRACT_16BITS(tptr)&0x0fff) {
case 0:
printf("IPv4 unicast");
break;
case 1:
printf("In-Band Management");
break;
case 2:
printf("IPv6 unicast");
break;
case 3:
printf("Multicast");
break;
case 4095:
printf("Development, Experimental or Proprietary");
break;
default:
printf("Reserved for IETF Consensus");
break;
}
printf(" Topology (0x%03x)%s%s",
EXTRACT_16BITS(tptr)&0xfff,
(EXTRACT_16BITS(tptr)&0x8000) ? "" : ", no sub-TLVs present",
(EXTRACT_16BITS(tptr)&0x4000) ? ", ATT bit set" : "" );
} else {
printf("\n\t\t\tmalformed MT-ID");
break;
}
i-=2;
tptr+=2;
}
break;
case TLV_RESTART_SIGNALING:
tptr=pptr;
printf("Restart Signaling (%u)",len);
if (!TTEST2(*tptr, 3))
goto trunctlv;
printf("\n\t\t\tRestart Request bit %s, Restart Acknowledgement bit %s\n\t\t\tRemaining holding time: %us",
ISIS_MASK_RESTART_RR(*tptr) ? "set" : "clear",
ISIS_MASK_RESTART_RA(*tptr) ? "set" : "clear",
EXTRACT_16BITS(tptr+1));
tptr += 3;
break;
default:
printf("unknown TLV, type %d, length %d\n\t\t\t", type, len);
tptr=pptr;
for(i=0;i<len;i++) {
if (!TTEST2(*(tptr+i), 1))
goto trunctlv;
printf("%02x",*(tptr+i)); /* formatted hex output of unknown TLV data */
if (i%2)
printf(" ");
if (i/16!=(i+1)/16) {
if (i<(len-1))
printf("\n\t\t\t");
}
}
break;
}
pptr += len;
packet_len -= len;
}
if (packet_len != 0) {
printf("\n\t\t\t %d straggler bytes", packet_len);
}
return (1);
trunc:
fputs("[|isis]", stdout);
return (1);
trunctlv:
printf("\n\t\t\t packet exceeded snapshot");
return(1);
}
/*
* Verify the checksum. See 8473-1, Appendix C, section C.4.
*/
static int
osi_cksum(register const u_char *p, register u_int len, u_char *off)
{
int32_t c0 = 0, c1 = 0;
if ((off[0] == 0) && (off[1] == 0))
return 0;
off[0] = off[1] = 0;
while ((int)--len >= 0) {
c0 += *p++;
c0 %= 255;
c1 += c0;
c1 %= 255;
}
return (c0 | c1);
}
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