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1a2af7c290
tcpdump/print-isoclns.c
guy 1a2af7c290 From Hannes Gredler: 
i have cleaned up most of the print-isoclns.c code
	and made heavy use of tok2str to display ascii
	strings - i also cleaned up the TLV parsing
	routines to use consitently while(tmp>0) loops
	when decoding a TLV;
2002-04-09 08:27:25 +00:00

1965 lines
55 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.
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.43 2002-04-09 08:27:25 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
static struct tok isis_pdu_values[] = {
{ L1_LAN_IIH, "L1 Lan IIH"},
{ L2_LAN_IIH, "L2 Lan IIH"},
{ PTP_IIH, "p2p IIH"},
{ L1_LSP, "L1 LSP"},
{ L2_LSP, "L2 LSP"},
{ L1_CSNP, "L1 CSNP"},
{ L2_CSNP, "L2 CSNP"},
{ L1_PSNP, "L1 PSNP"},
{ L2_PSNP, "L2 PSNP"},
{ 0, NULL}
};
/*
* 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.
*
* list taken from draft-ietf-isis-wg-tlv-codepoints-01.txt
*/
#define TLV_AREA_ADDR 1
#define TLV_IS_REACH 2
#define TLV_ESNEIGH 3
#define TLV_PART_DIS 4
#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_LSP_BUFFERSIZE 14
#define TLV_EXT_IS_REACH 22
#define TLV_DECNET_PHASE4 42
#define TLV_LUCENT_PRIVATE 66
#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_SHARED_RISK_GROUP 138
#define TLV_NORTEL_PRIVATE1 176
#define TLV_NORTEL_PRIVATE2 177
#define TLV_RESTART_SIGNALING 211
#define TLV_MT_IS_REACH 222
#define TLV_MT_SUPPORTED 229
#define TLV_IP6ADDR 232
#define TLV_MT_IP_REACH 235
#define TLV_IP6_REACH 236
#define TLV_MT_IP6_REACH 237
#define TLV_PTP_ADJ 240
static struct tok isis_tlv_values[] = {
{ TLV_AREA_ADDR, "Area address(es)"},
{ TLV_IS_REACH, "IS Reachability"},
{ TLV_ESNEIGH, "IS Neighbor(s)"},
{ TLV_PART_DIS, "Partition DIS"},
{ TLV_SUMMARY, "Prefix Neighbors"},
{ TLV_ISNEIGH, "IS Neighbor(s)"},
{ TLV_PADDING, "Padding"},
{ TLV_LSP, "LSP entries"},
{ TLV_AUTH, "Authentication"},
{ TLV_CHECKSUM, "Checksum"},
{ TLV_LSP_BUFFERSIZE, "LSP Buffersize"},
{ TLV_EXT_IS_REACH, "Extended IS Reachability"},
{ TLV_DECNET_PHASE4, "DECnet Phase IV"},
{ TLV_LUCENT_PRIVATE, "Lucent Proprietary"},
{ TLV_IP_REACH, "IP Internal reachability"},
{ TLV_PROTOCOLS, "Protocols supported"},
{ TLV_IP_REACH_EXT, "IP External reachability"},
{ TLV_IDRP_INFO, "Inter-Domain Information Type"},
{ TLV_IPADDR, "IP Interface address(es)"},
{ TLV_IPAUTH, "IP authentication (depreciated)"},
{ TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"},
{ TLV_EXT_IP_REACH, "Extended IP reachability"},
{ TLV_HOSTNAME, "Hostname"},
{ TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"},
{ TLV_NORTEL_PRIVATE1, "Nortel Proprietary"},
{ TLV_NORTEL_PRIVATE2, "Nortel Proprietary"},
{ TLV_RESTART_SIGNALING, "Restart Signaling"},
{ TLV_MT_IS_REACH, "Multi Topology IS Reachability"},
{ TLV_MT_SUPPORTED, "Multi Topology"},
{ TLV_IP6ADDR, "IP6 Interface address(es)"},
{ TLV_MT_IP_REACH, "Multi-Topology IP reachability"},
{ TLV_IP6_REACH, "IP6 reachability"},
{ TLV_MT_IP6_REACH, "Multi-Topology IP6 reachability"},
{ TLV_PTP_ADJ, "Point-to-point Adjacency State"},
{ 0, NULL }
};
#define SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3
#define SUBTLV_EXT_IS_REACH_LINK_LOCAL_ID 4
#define SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5
#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_EXT_IS_REACH_LINK_PROTECTION_TYPE 20
#define SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21
#define SUBTLV_EXT_IP_REACH_ADMIN_TAG 1
#define SUBTLV_AUTH_SIMPLE 1
#define SUBTLV_AUTH_MD5 54
#define SUBTLV_AUTH_MD5_LEN 16
#define SUBTLV_AUTH_PRIVATE 255
static struct tok isis_subtlv_auth_values[] = {
{ SUBTLV_AUTH_SIMPLE, "simple text password"},
{ SUBTLV_AUTH_MD5, "HMAC-MD5 password"},
{ SUBTLV_AUTH_PRIVATE, "Routing Domain private password"},
{ 0, NULL }
};
#define ISIS_8BIT_MASK(x) ((x)&0xff)
#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_MTID(x) ((x)&0xfff)
#define ISIS_MASK_MTSUB(x) ((x)&0x8000)
#define ISIS_MASK_MTATT(x) ((x)&0x4000)
#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_TLV_RESTART_RR(x) ((x)&0x1)
#define ISIS_MASK_TLV_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_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
static const char *isis_gmpls_link_prot_values[] = {
"Extra",
"Unprotected",
"Shared",
"Dedicated 1:1",
"Dedicated 1+1",
"Enhanced",
"Reserved",
"Reserved"
};
static struct tok isis_gmpls_sw_cap_values[] = {
{ 1, "Packet-Switch Capable-1"},
{ 2, "Packet-Switch Capable-2"},
{ 3, "Packet-Switch Capable-3"},
{ 4, "Packet-Switch Capable-4"},
{ 51, "Layer-2 Switch Capable"},
{ 100, "Time-Division-Multiplex"},
{ 150, "Lambda-Switch Capable"},
{ 200, "Fiber-Switch Capable"},
{ 0, NULL }
};
static struct tok isis_gmpls_lsp_enc_values[] = {
{ 1, "Packet"},
{ 2, "Ethernet V2/DIX"},
{ 3, "ANSI PDH"},
{ 4, "ETSI PDH"},
{ 5, "SDH ITU-T G.707"},
{ 6, "SONET ANSI T1.105"},
{ 7, "Digital Wrapper"},
{ 8, "Lambda (photonic)"},
{ 9, "Fiber"},
{ 10, "Ethernet 802.3"},
{ 11, "FiberChannel"},
{ 0, NULL }
};
static struct tok isis_mt_values[] = {
{ 0, "IPv4 unicast"},
{ 1, "In-Band Management"},
{ 2, "IPv6 unicast"},
{ 3, "Multicast"},
{ 4095, "Development, Experimental or Proprietary"},
{ 0, NULL }
};
static struct tok isis_iih_circuit_type_values[] = {
{ 1, "Level 1 only"},
{ 2, "Level 2 only"},
{ 3, "Level 1, Level 2"},
{ 0, NULL}
};
#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, NULL }
};
/*
* 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 struct tok isis_ptp_adjancey_values[] = {
{ ISIS_PTP_ADJ_UP, "Up" },
{ ISIS_PTP_ADJ_INIT, "Initializing" },
{ ISIS_PTP_ADJ_DOWN, "Down" },
{ 0, NULL}
};
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];
};
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);
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];
};
static struct tok isis_is_reach_virtual_values[] = {
{ 0, "IsNotVirtual"},
{ 1, "IsVirtual"},
{ 0, NULL }
};
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);
}
/*
* this is a generic routine for printing unknown data;
* as it is called from various places (TLV and subTLV parsing routines)
* we pass on the linefeed plus indentation string to
* get a proper output - returns 0 on error
*/
static int
isis_print_unknown_data(const u_char *cp,const u_char *lf,int len)
{
int i;
printf("%s0x0000: ",lf);
for(i=0;i<len;i++) {
if (!TTEST2(*(cp+i), 1))
goto trunctlv;
printf("%02x",*(cp+i));
if (i%2)
printf(" ");
if (i/16!=(i+1)/16) {
if (i<(len-1))
printf("%s0x%04x: ",lf,i);
}
}
return(1); /* everything is ok */
trunctlv:
printf("%spacket exceeded snapshot",lf);
return(0);
}
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;
/* lets see if we can transform the mask into a prefixlen */
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: %s mask %s",
ipaddr_string((tlv_ip_reach->prefix)),
ipaddr_string((tlv_ip_reach->mask)));
else
printf("\n\t\t\tIPv4 prefix: %s/%u",
ipaddr_string((tlv_ip_reach->prefix)),
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);
}
/*
* this is the common IP-REACH subTLV decoder it is called
* from various EXTD-IP REACH TLVs (135,236)
*/
static int
isis_print_ip_reach_subtlv (const u_char *tptr,int subt,int subl,const u_char *lf) {
switch(subt) {
case SUBTLV_EXT_IP_REACH_ADMIN_TAG:
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("%sAdministrative tag: 0x%08x",
lf,
EXTRACT_32BITS(tptr));
break;
default:
printf("%sunknown subTLV, type %d, length %d",
lf,
subt,
subl);
if(!isis_print_unknown_data(tptr,"\n\t\t\t ",
subl))
return(0);
break;
}
return(1);
trunctlv:
printf("%spacket exceeded snapshot",lf);
return(0);
}
/*
* this is the common IS-REACH subTLV decoder it is called
* from various EXTD-IS REACH TLVs (22,222)
*/
static int
isis_print_is_reach_subtlv (const u_char *tptr,int subt,int subl,const u_char *lf) {
int i,j;
float bw; /* copy buffer for several subTLVs */
switch(subt) {
case SUBTLV_EXT_IS_REACH_ADMIN_GROUP:
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("%sAdministrative groups: 0x%08x",
lf,
EXTRACT_32BITS(tptr));
break;
case SUBTLV_EXT_IS_REACH_LINK_LOCAL_ID:
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("%sLink Local Identifier: 0x%08x",
lf,
EXTRACT_32BITS(tptr));
break;
case SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("%sLink Remote Identifier: 0x%08x",
lf,
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("%sMaximum link bandwidth : %.3f Mbps",
lf,
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("%sReservable link bandwidth: %.3f Mbps",
lf,
bw*8/1000000 );
break;
case SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
printf("%sUnreserved bandwidth:",lf);
for (i = 0; i < 8; i++) {
if (!TTEST2(*(tptr+i*4),4))
goto trunctlv;
j = EXTRACT_32BITS(tptr);
memcpy (&bw, &j, 4);
printf("%s priority level %d: %.3f Mbps",
lf,
i,
bw*8/1000000 );
}
break;
case SUBTLV_EXT_IS_REACH_TE_METRIC:
if (!TTEST2(*tptr,3))
goto trunctlv;
printf("%sTraffic Engineering Metric: %d",
lf,
EXTRACT_24BITS(tptr));
break;
case SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("%sIPv4 interface address: %s",
lf,
ipaddr_string(tptr));
break;
case SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("%sIPv4 neighbor address: %s",
lf,
ipaddr_string(tptr));
break;
case SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
if (!TTEST2(*tptr,2))
goto trunctlv;
i = 0;
j = (ISIS_8BIT_MASK(*tptr)); /* fetch the typecode and make sure
that no high-order LSBs are set */
printf("%sLink Protection Type: %s",
lf,
(j) ? "" : "none" );
/* scan through the bits until the typecode is zero */
while(!j) {
printf("%s", isis_gmpls_link_prot_values[i]);
j=j>>1;
if (j) /*any other bit set ?*/
printf(", ");
i++;
}
printf(", Priority %u", *(tptr+1));
break;
case SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
printf("%sInterface Switching Capability",lf);
if (!TTEST2(*tptr,1))
goto trunctlv;
printf("%s Interface Switching Capability:%s",
lf,
tok2str(isis_gmpls_sw_cap_values, "Unknown", *(tptr)));
if (!TTEST2(*(tptr+1),1))
goto trunctlv;
printf(", LSP Encoding: %s",
tok2str(isis_gmpls_lsp_enc_values, "Unknown", *(tptr+1)));
if (!TTEST2(*(tptr+2),2)) /* skip 2 res. bytes */
goto trunctlv;
printf("%s Max LSP Bandwidth:",lf);
for (i = 0; i < 8; i++) {
if (!TTEST2(*(tptr+(i*4)+4),4))
goto trunctlv;
j = EXTRACT_32BITS(tptr);
memcpy (&bw, &j, 4);
printf("%s priority level %d: %.3f Mbps",
lf,
i,
bw*8/1000000 );
}
subl-=36;
/* there is some optional stuff left to decode but this is as of yet
not specified so just lets hexdump what is left */
if(subl>0){
if(!isis_print_unknown_data(tptr,"\n\t\t\t ",
subl-36))
return(0);
}
break;
case 250:
case 251:
case 252:
case 253:
case 254:
printf("%sReserved for cisco specific extensions, type %d, length %d",
lf,
subt,
subl);
break;
case 255:
printf("%sReserved for future expansion, type %d, length %d",
lf,
subt,
subl);
break;
default:
printf("%sunknown subTLV, type %d, length %d",
lf,
subt,
subl);
if(!isis_print_unknown_data(tptr,"\n\t\t\t ",
subl))
return(0);
break;
}
return(1);
trunctlv:
printf("%spacket exceeded snapshot",lf);
return(0);
}
/*
* 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, id_length, type, len, tmp, alen, subl, subt, tslen;
const u_char *optr, *pptr, *tptr;
u_short packet_len,pdu_len,time_remain;
u_int i,j,bit_length,byte_length,metric,ra,rr;
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];
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;
}
id_length = header->id_length;
switch(id_length) {
case 0:
id_length = 6; /* silly shit again */
break;
case 1: /* 1-8 are valid sys-ID lenghts */
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
case 8:
break;
case 255:
id_length = 0; /* entirely useless */
break;
default:
printf(", bad packet -- illegal sys-ID length (%u)", id_length);
return (0);
break;
}
printf(", hlen: %u, v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
header->fixed_len,
header->version,
id_length,
header->id_length,
max_area,
header->max_area);
pdu_type=header->pdu_type;
/* first lets see if we know the PDU name*/
printf(", %s",
tok2str(isis_pdu_values,
"unknown PDU, type %d",
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;
}
TCHECK(*header_iih_lan);
printf("\n\t\t source-id: ");
isis_print_sysid(header_iih_lan->source_id);
printf(", holding time: %u, %s",
EXTRACT_16BITS(header_iih_lan->holding_time),
tok2str(isis_iih_circuit_type_values,
"unknown circuit type 0x%02x",
header_iih_lan->circuit_type));
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;
}
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, %s",
header_iih_ptp->circuit_id,
tok2str(isis_iih_circuit_type_values,
"unknown circuit type 0x%02x",
header_iih_ptp->circuit_type));
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;
}
TCHECK(*header_lsp);
printf("\n\t\t lsp-id: ");
isis_print_lspid(header_lsp->lsp_id);
printf(", seq: 0x%08x",EXTRACT_32BITS(header_lsp->sequence_number));
printf(", lifetime: %5us",EXTRACT_16BITS(header_lsp->remaining_lifetime));
printf("\n\t\t chksum: 0x%04x",EXTRACT_16BITS(header_lsp->checksum));
/* verify the checksum */
if (osi_cksum(optr, length, off))
printf(" (incorrect)");
else
printf(" (correct)");
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;
}
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;
}
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:
if(!isis_print_unknown_data(pptr,"\n\t\t ",length))
return(0);
return (0);
}
/*
* 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++;
tmp =len; /* copy temporary len & pointer to packet data */
tptr = pptr;
packet_len -= 2;
if (len > packet_len) {
break;
}
/* first lets see if we know the TLVs name*/
printf("\n\t\t %s (%u)",
tok2str(isis_tlv_values,
"unknown TLV, type %d, length",
type),
len);
/* now check if we have a decoder otherwise do a hexdump at the end*/
switch (type) {
case TLV_AREA_ADDR:
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:
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:
break;
case TLV_MT_IS_REACH:
while (tmp>0) {
if (!TTEST2(*tptr, 2))
goto trunctlv;
printf("\n\t\t\t%s",
tok2str(isis_mt_values,
"Reserved for IETF Consensus",
ISIS_MASK_MTID(EXTRACT_16BITS(tptr))));
printf(" Topology (0x%03x)",
ISIS_MASK_MTID(EXTRACT_16BITS(tptr)));
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 ");
if (tslen) {
printf(" (%u)",tslen);
while (tslen>0) {
if (!TTEST2(*tptr,2))
goto trunctlv;
subt=*(tptr++);
subl=*(tptr++);
if(!isis_print_is_reach_subtlv(tptr,subt,subl,"\n\t\t\t "))
return(0);
tptr+=subl;
tslen-=(subl+2);
tmp-=(subl+2);
}
}
tmp-=(SYSTEM_ID_LEN+7);
}
break;
case TLV_EXT_IS_REACH:
while (tmp>0) {
if (!TTEST2(*tptr, SYSTEM_ID_LEN+1))
goto trunctlv;
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++); /* read out subTLV length */
printf(", %ssub-TLVs present",tslen ? "" : "no ");
if (tslen) {
printf(" (%u)",tslen);
while (tslen>0) {
if (!TTEST2(*tptr,2))
goto trunctlv;
subt=*(tptr++);
subl=*(tptr++);
if(!isis_print_is_reach_subtlv(tptr,subt,subl,"\n\t\t\t "))
return(0);
tptr+=subl;
tslen-=(subl+2);
tmp-=(subl+2);
}
}
tmp-=(SYSTEM_ID_LEN+5);
}
break;
case TLV_IS_REACH:
if (!TTEST2(*tptr,1)) /* check if there is one byte left to read out the virtual flag */
goto trunctlv;
printf("\n\t\t\t%s",
tok2str(isis_is_reach_virtual_values,
"bogus virtual flag 0x%02x",
*tptr++));
tlv_is_reach = (const struct isis_tlv_is_reach *)tptr;
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;
/* those two TLVs share the same format */
case TLV_IP_REACH:
case TLV_IP_REACH_EXT:
if (!isis_print_tlv_ip_reach(pptr, len))
return (1);
break;
case TLV_MT_IP_REACH:
while (tmp>0) {
if (!TTEST2(*tptr, 2))
goto trunctlv;
printf("\n\t\t\t%s",
tok2str(isis_mt_values,
"Reserved for IETF Consensus",
ISIS_MASK_MTID(EXTRACT_16BITS(tptr))));
printf(" Topology (0x%03x)",
ISIS_MASK_MTID(EXTRACT_16BITS(tptr)));
tptr+=2;
memset (prefix, 0, 4);
if (!TTEST2(*tptr, 4))
return (1);
metric = EXTRACT_32BITS(tptr);
tptr+=4;
if (!TTEST2(*tptr, 1)) /* fetch status byte */
return (1);
j=*(tptr);
bit_length = (*(tptr)++&0x3f);
byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
if (!TTEST2(*tptr, byte_length))
return (1);
memcpy(prefix,tptr,byte_length);
tptr+=byte_length;
printf("\n\t\t\tIPv4 prefix: %s/%d",
ipaddr_string(prefix),
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)) {
/* assume that one prefix can hold more
than one subTLV - therefore the first byte must reflect
the aggregate bytecount of the subTLVs for this prefix
*/
if (!TTEST2(*tptr, 1))
return (1);
tslen=*(tptr++);
tmp--;
printf(" (%u)",tslen); /* print out subTLV length */
while (tslen>0) {
if (!TTEST2(*tptr,2))
goto trunctlv;
subt=*(tptr++);
subl=*(tptr++);
if(!isis_print_ip_reach_subtlv(tptr,subt,subl,"\n\t\t\t "))
return(0);
tptr+=subl;
tslen-=(subl+2);
tmp-=(subl+2);
}
}
tmp-=(7+byte_length);
}
break;
case TLV_EXT_IP_REACH:
while (tmp>0) {
memset (prefix, 0, 4);
if (!TTEST2(*tptr, 4))
return (1);
metric = EXTRACT_32BITS(tptr);
tptr+=4;
if (!TTEST2(*tptr, 1)) /* fetch status byte */
return (1);
j=*(tptr);
bit_length = (*(tptr)++&0x3f);
byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
if (!TTEST2(*tptr, byte_length))
return (1);
memcpy(prefix,tptr,byte_length);
tptr+=byte_length;
printf("\n\t\t\tIPv4 prefix: %s/%d",
ipaddr_string(prefix),
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)) {
/* assume that one prefix can hold more
than one subTLV - therefore the first byte must reflect
the aggregate bytecount of the subTLVs for this prefix
*/
if (!TTEST2(*tptr, 1))
return (1);
tslen=*(tptr++);
tmp--;
printf(" (%u)",tslen); /* print out subTLV length */
while (tslen>0) {
if (!TTEST2(*tptr,2))
goto trunctlv;
subt=*(tptr++);
subl=*(tptr++);
if(!isis_print_ip_reach_subtlv(tptr,subt,subl,"\n\t\t\t "))
return(0);
tptr+=subl;
tslen-=(subl+2);
tmp-=(subl+2);
}
}
tmp-=(5+byte_length);
}
break;
#ifdef INET6
case TLV_IP6_REACH:
while (tmp>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);
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)) {
/* assume that one prefix can hold more
than one subTLV - therefore the first byte must reflect
the aggregate bytecount of the subTLVs for this prefix
*/
if (!TTEST2(*tptr, 1))
return (1);
tslen=*(tptr++);
tmp--;
printf(" (%u)",tslen); /* print out subTLV length */
while (tslen>0) {
if (!TTEST2(*tptr,2))
goto trunctlv;
subt=*(tptr++);
subl=*(tptr++);
if(!isis_print_ip_reach_subtlv(tptr,subt,subl,"\n\t\t\t "))
return(0);
tptr+=subl;
tslen-=(subl+2);
tmp-=(subl+2);
}
}
tmp-=(6+byte_length);
}
break;
#endif
#ifdef INET6
case TLV_IP6ADDR:
while (tmp>0) {
if (!TTEST2(*tptr, 16))
goto trunctlv;
printf("\n\t\t\tIPv6 interface address: %s",
ip6addr_string(tptr));
tptr += 16;
tmp -= 16;
}
break;
#endif
case TLV_AUTH:
if (!TTEST2(*tptr, 1))
goto trunctlv;
printf("\n\t\t\t%s: ",
tok2str(isis_subtlv_auth_values,
"unknown Authentication type 0x%02x",
*tptr));
switch (*tptr) {
case SUBTLV_AUTH_SIMPLE:
for(i=1;i<len;i++) {
if (!TTEST2(*(tptr+i), 1))
goto trunctlv;
printf("%c",*(tptr+i));
}
break;
case SUBTLV_AUTH_MD5:
for(i=1;i<len;i++) {
if (!TTEST2(*(tptr+i), 1))
goto trunctlv;
printf("%02x",*(tptr+i));
}
if (len != SUBTLV_AUTH_MD5_LEN+1)
printf(", (malformed subTLV) ");
break;
case SUBTLV_AUTH_PRIVATE:
default:
if(!isis_print_unknown_data(tptr+1,"\n\t\t\t ",len-1))
return(0);
break;
}
break;
case TLV_PTP_ADJ:
tlv_ptp_adj = (const struct isis_tlv_ptp_adj *)tptr;
if(tmp>=1) {
if (!TTEST2(*tptr, 1))
goto trunctlv;
printf("\n\t\t\tAdjacency State: %s",
tok2str(isis_ptp_adjancey_values, "0x%02x", *tptr));
tmp--;
}
if(tmp>=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));
tmp-=4;
}
if(tmp>=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);
tmp-=6;
}
if(tmp>=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("\n\t\t\tNLPID(s): ");
while (tmp>0) {
if (!TTEST2(*(tptr), 1))
goto trunctlv;
printf("%s",
tok2str(isis_nlpid_values,
"Unknown 0x%02x",
*tptr++));
if (tmp>1) /* further NPLIDs ? - put comma */
printf(", ");
tmp--;
}
break;
case TLV_TE_ROUTER_ID:
if (!TTEST2(*pptr, 4))
goto trunctlv;
printf("\n\t\t\tTraffic Engineering Router ID: %s", ipaddr_string(pptr));
break;
case TLV_IPADDR:
while (tmp>0) {
if (!TTEST2(*tptr, 4))
goto trunctlv;
printf("\n\t\t\tIPv4 interface address: %s", ipaddr_string(tptr));
tptr += 4;
tmp -= 4;
}
break;
case TLV_HOSTNAME:
printf("\n\t\t\tHostname: ");
while (tmp>0) {
if (!TTEST2(*tptr, 1))
goto trunctlv;
printf("%c",*tptr++);
tmp--;
}
break;
case TLV_SHARED_RISK_GROUP:
if (!TTEST2(*tptr, 7))
goto trunctlv;
printf("\n\t\t\tIS Neighbor: ");
if (!isis_print_nodeid(tptr))
return (1);
tptr+=(SYSTEM_ID_LEN+1);
len-=(SYSTEM_ID_LEN+1);
if (!TTEST2(*tptr, 1))
goto trunctlv;
printf(", %s", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered");
len--;
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("\n\t\t\tIPv4 interface address: %s", ipaddr_string(tptr));
tptr+=4;
len-=4;
if (!TTEST2(*tptr,4))
goto trunctlv;
printf("\n\t\t\tIPv4 neighbor address: %s", ipaddr_string(tptr));
tptr+=4;
len-=4;
while (tmp>0) {
if (!TTEST2(*tptr, 4))
goto trunctlv;
printf("\n\t\t\tLink-ID: 0x%08x", EXTRACT_32BITS(tptr));
tptr+=4;
len-=4;
}
break;
case TLV_LSP:
tlv_lsp = (const struct isis_tlv_lsp *)tptr;
while(tmp>0) {
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(", seq: 0x%08x",EXTRACT_32BITS(tlv_lsp->sequence_number));
if (!TTEST2(tlv_lsp->remaining_lifetime, 2))
goto trunctlv;
printf(", lifetime: %5ds",EXTRACT_16BITS(tlv_lsp->remaining_lifetime));
if (!TTEST2(tlv_lsp->checksum, 2))
goto trunctlv;
printf(", chksum: 0x%04x",EXTRACT_16BITS(tlv_lsp->checksum));
tmp-=sizeof(struct isis_tlv_lsp);
tlv_lsp++;
}
break;
case TLV_CHECKSUM:
if (!TTEST2(*tptr, 2))
goto trunctlv;
printf("\n\t\t\tchecksum: 0x%04x",
EXTRACT_16BITS(tptr));
if (osi_cksum(optr, length, off))
printf(" (incorrect)");
else
printf(" (correct)");
break;
case TLV_MT_SUPPORTED:
while (tmp>1) {
/* length can only be a multiple of 2, otherwise there is
something broken -> so decode down until length is 1 */
if (tmp!=1) {
if (!TTEST2(*tptr, 2))
goto trunctlv;
printf("\n\t\t\t%s",
tok2str(isis_mt_values,
"Reserved for IETF Consensus",
ISIS_MASK_MTID(EXTRACT_16BITS(tptr))));
printf(" Topology (0x%03x)%s%s",
ISIS_MASK_MTID(EXTRACT_16BITS(tptr)),
ISIS_MASK_MTSUB(EXTRACT_16BITS(tptr)) ? "" : ", no sub-TLVs present",
ISIS_MASK_MTATT(EXTRACT_16BITS(tptr)) ? ", ATT bit set" : "" );
} else {
printf("\n\t\t\tmalformed MT-ID");
break;
}
tmp-=2;
tptr+=2;
}
break;
case TLV_RESTART_SIGNALING:
if (!TTEST2(*tptr, 3))
goto trunctlv;
rr = ISIS_MASK_TLV_RESTART_RR(*tptr);
ra = ISIS_MASK_TLV_RESTART_RA(*tptr);
tptr++;
time_remain = EXTRACT_16BITS(tptr);
printf("\n\t\t\tRestart Request bit %s, Restart Acknowledgement bit %s\n\t\t\tRemaining holding time: %us",
rr ? "set" : "clear", ra ? "set" : "clear", time_remain);
break;
/*
* FIXME those are the defined TLVs that lack a decoder
* you are welcome to contribute code ;-)
*/
case TLV_ESNEIGH:
case TLV_PART_DIS:
case TLV_SUMMARY:
case TLV_LSP_BUFFERSIZE:
case TLV_DECNET_PHASE4:
case TLV_LUCENT_PRIVATE:
case TLV_IDRP_INFO:
case TLV_IPAUTH:
case TLV_NORTEL_PRIVATE1:
case TLV_NORTEL_PRIVATE2:
case TLV_MT_IP6_REACH:
default:
if(!isis_print_unknown_data(pptr,"\n\t\t\t",len))
return(0);
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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