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display the DIS lan-id of an IIH in non-verbose mode
[tcpdump] / print-isoclns.c
diff --git a/print-isoclns.c b/print-isoclns.c
index 08e9bb6461202a502a2be47abb82f9fddbbcba38..f610fd323a28122d1a20028b9a1a092dcf3915d9 100644 (file)
--- a/print-isoclns.c
+++ b/print-isoclns.c
@@ -26,18 +26,14 @@
 
 #ifndef lint
 static const char rcsid[] =
 
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.24 2001-09-09 19:26:46 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/tcpdump/print-isoclns.c,v 1.102 2003-10-28 19:10:15 hannes Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
 
 #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 <tcpdump-stdinc.h>
 
 #include <stdio.h>
 #include <string.h>
 
 #include <stdio.h>
 #include <string.h>
@@ -47,19 +43,26 @@ static const char rcsid[] =
 #include "ethertype.h"
 #include "ether.h"
 #include "extract.h"
 #include "ethertype.h"
 #include "ether.h"
 #include "extract.h"
+#include "gmpls.h"
 
 #define        NLPID_CLNS      129     /* 0x81 */
 #define        NLPID_ESIS      130     /* 0x82 */
 #define        NLPID_ISIS      131     /* 0x83 */
 #define NLPID_IP6       0x8e
 
 #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_IP        0xcc
 #define        NLPID_NULLNS    0
 
 #define        NLPID_NULLNS    0
 
+#define IPV4            1       /* AFI value */
+#define IPV6            2       /* AFI value */
+
 /*
  * IS-IS is defined in ISO 10589.  Look there for protocol definitions.
  */
 
 #define SYSTEM_ID_LEN  ETHER_ADDR_LEN
 /*
  * IS-IS is defined in ISO 10589.  Look there for protocol definitions.
  */
 
 #define SYSTEM_ID_LEN  ETHER_ADDR_LEN
+#define NODE_ID_LEN     SYSTEM_ID_LEN+1
+#define LSP_ID_LEN      SYSTEM_ID_LEN+2
+
 #define ISIS_VERSION   1
 #define PDU_TYPE_MASK  0x1F
 #define PRIORITY_MASK  0x7F
 #define ISIS_VERSION   1
 #define PDU_TYPE_MASK  0x1F
 #define PRIORITY_MASK  0x7F
@@ -74,51 +77,177 @@ static const char rcsid[] =
 #define L1_PSNP                26
 #define L2_PSNP                27
 
 #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.
 
 /*
  * 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 rfc3359 plus some memory from veterans ;-)
  */
 
  */
 
-#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_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 TLV_AREA_ADDR           1   /* iso10589 */
+#define TLV_IS_REACH            2   /* iso10589 */
+#define TLV_ESNEIGH             3   /* iso10589 */
+#define TLV_PART_DIS            4   /* iso10589 */
+#define TLV_PREFIX_NEIGH        5   /* iso10589 */
+#define TLV_ISNEIGH             6   /* iso10589 */
+#define TLV_ISNEIGH_VARLEN      7   /* iso10589 */
+#define TLV_PADDING             8   /* iso10589 */
+#define TLV_LSP                 9   /* iso10589 */
+#define TLV_AUTH                10  /* iso10589, rfc3567 */
+#define TLV_CHECKSUM            12  /* rfc3358 */
+#define TLV_LSP_BUFFERSIZE      14  /* iso10589 rev2 */
+#define TLV_EXT_IS_REACH        22  /* draft-ietf-isis-traffic-05 */
+#define TLV_IS_ALIAS_ID         24  /* draft-ietf-isis-ext-lsp-frags-02 */
+#define TLV_DECNET_PHASE4       42
+#define TLV_LUCENT_PRIVATE      66
+#define TLV_IP_REACH            128 /* rfc1195, rfc2966 */
+#define TLV_PROTOCOLS           129 /* rfc1195 */
+#define TLV_IP_REACH_EXT        130 /* rfc1195, rfc2966 */
+#define TLV_IDRP_INFO           131 /* rfc1195 */
+#define TLV_IPADDR              132 /* rfc1195 */
+#define TLV_IPAUTH              133 /* rfc1195 */
+#define TLV_TE_ROUTER_ID        134 /* draft-ietf-isis-traffic-05 */
+#define TLV_EXT_IP_REACH        135 /* draft-ietf-isis-traffic-05 */
+#define TLV_HOSTNAME            137 /* rfc2763 */
+#define TLV_SHARED_RISK_GROUP   138 /* draft-ietf-isis-gmpls-extensions */
+#define TLV_NORTEL_PRIVATE1     176
+#define TLV_NORTEL_PRIVATE2     177
+#define TLV_HOLDTIME            198 /* ES-IS */
+#define TLV_RESTART_SIGNALING   211 /* draft-ietf-isis-restart-01 */
+#define TLV_MT_IS_REACH         222 /* draft-ietf-isis-wg-multi-topology-05 */
+#define TLV_MT_SUPPORTED        229 /* draft-ietf-isis-wg-multi-topology-05 */
+#define TLV_IP6ADDR             232 /* draft-ietf-isis-ipv6-02 */
+#define TLV_MT_IP_REACH         235 /* draft-ietf-isis-wg-multi-topology-05 */
+#define TLV_IP6_REACH           236 /* draft-ietf-isis-ipv6-02 */
+#define TLV_MT_IP6_REACH        237 /* draft-ietf-isis-wg-multi-topology-05 */
+#define TLV_PTP_ADJ             240 /* rfc3373 */
+#define TLV_IIH_SEQNR           241 /* draft-shen-isis-iih-sequence-00 */
+#define TLV_VENDOR_PRIVATE      250 /* draft-ietf-isis-proprietary-tlv-00 */
+
+static struct tok isis_tlv_values[] = {
+    { TLV_AREA_ADDR,        "Area address(es)"},
+    { TLV_IS_REACH,          "IS Reachability"},
+    { TLV_ESNEIGH,           "ES Neighbor(s)"},
+    { TLV_PART_DIS,          "Partition DIS"},
+    { TLV_PREFIX_NEIGH,      "Prefix Neighbors"},
+    { TLV_ISNEIGH,           "IS Neighbor(s)"},
+    { TLV_ISNEIGH_VARLEN,    "IS Neighbor(s) (variable length)"},
+    { 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_IS_ALIAS_ID,       "IS Alias ID"},
+    { TLV_DECNET_PHASE4,     "DECnet Phase IV"},
+    { TLV_LUCENT_PRIVATE,    "Lucent Proprietary"},
+    { TLV_IP_REACH,          "IPv4 Internal Reachability"},
+    { TLV_PROTOCOLS,         "Protocols supported"},
+    { TLV_IP_REACH_EXT,      "IPv4 External Reachability"},
+    { TLV_IDRP_INFO,         "Inter-Domain Information Type"},
+    { TLV_IPADDR,            "IPv4 Interface address(es)"},
+    { TLV_IPAUTH,            "IPv4 authentication (deprecated)"},
+    { TLV_TE_ROUTER_ID,      "Traffic Engineering Router ID"},
+    { TLV_EXT_IP_REACH,      "Extended IPv4 Reachability"},
+    { TLV_HOSTNAME,          "Hostname"},
+    { TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"},
+    { TLV_NORTEL_PRIVATE1,   "Nortel Proprietary"},
+    { TLV_NORTEL_PRIVATE2,   "Nortel Proprietary"},
+    { TLV_HOLDTIME,          "Holdtime"},
+    { TLV_RESTART_SIGNALING, "Restart Signaling"},
+    { TLV_MT_IS_REACH,       "Multi Topology IS Reachability"},
+    { TLV_MT_SUPPORTED,      "Multi Topology"},
+    { TLV_IP6ADDR,           "IPv6 Interface address(es)"},
+    { TLV_MT_IP_REACH,       "Multi-Topology IPv4 Reachability"},
+    { TLV_IP6_REACH,         "IPv6 reachability"},
+    { TLV_MT_IP6_REACH,      "Multi-Topology IP6 Reachability"},
+    { TLV_PTP_ADJ,           "Point-to-point Adjacency State"},
+    { TLV_IIH_SEQNR,         "Hello PDU Sequence Number"},
+    { TLV_VENDOR_PRIVATE,    "Vendor Private"},
+    { 0, NULL }
+};
+
+#define SUBTLV_EXT_IS_REACH_ADMIN_GROUP           3 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID  4 /* draft-ietf-isis-gmpls-extensions */
+#define SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID        5 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR        6 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR    8 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_MAX_LINK_BW           9 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_RESERVABLE_BW        10 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_UNRESERVED_BW        11 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_TE_METRIC            18 /* draft-ietf-isis-traffic-05 */
+#define SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* draft-ietf-isis-gmpls-extensions */
+#define SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR    21 /* draft-ietf-isis-gmpls-extensions */
+
+static struct tok isis_ext_is_reach_subtlv_values[] = {
+    { SUBTLV_EXT_IS_REACH_ADMIN_GROUP,            "Administrative groups" },
+    { SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID,   "Link Local/Remote Identifier" },
+    { SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID,         "Link Remote Identifier" },
+    { SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR,         "IPv4 interface address" },
+    { SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR,     "IPv4 neighbor address" },
+    { SUBTLV_EXT_IS_REACH_MAX_LINK_BW,            "Maximum link bandwidth" },
+    { SUBTLV_EXT_IS_REACH_RESERVABLE_BW,          "Reservable link bandwidth" },
+    { SUBTLV_EXT_IS_REACH_UNRESERVED_BW,          "Unreserved bandwidth" },
+    { SUBTLV_EXT_IS_REACH_TE_METRIC,              "Traffic Engineering Metric" },
+    { SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE,   "Link Protection Type" },
+    { SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR,      "Interface Switching Capability" },
+    { 250,                                        "Reserved for cisco specific extensions" },
+    { 251,                                        "Reserved for cisco specific extensions" },
+    { 252,                                        "Reserved for cisco specific extensions" },
+    { 253,                                        "Reserved for cisco specific extensions" },
+    { 254,                                        "Reserved for cisco specific extensions" },
+    { 255,                                        "Reserved for future expansion" },
+    { 0, NULL }
+};
+
+#define SUBTLV_IP_REACH_ADMIN_TAG32               1
+#define SUBTLV_IP_REACH_ADMIN_TAG64               2
+
+static struct tok isis_ext_ip_reach_subtlv_values[] = {
+    { SUBTLV_IP_REACH_ADMIN_TAG32,                "32-Bit Administrative tag" },
+    { SUBTLV_IP_REACH_ADMIN_TAG64,                "64-Bit Administrative tag" },
+    { 0, NULL }
+};
+
+#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 SUBTLV_IDRP_RES           0
+#define SUBTLV_IDRP_LOCAL         1
+#define SUBTLV_IDRP_ASN           2
+
+static struct tok isis_subtlv_idrp_values[] = {
+    { SUBTLV_IDRP_RES,         "Reserved"},
+    { SUBTLV_IDRP_LOCAL,       "Routing-Domain Specific"},
+    { SUBTLV_IDRP_ASN,         "AS Number Tag"},
+    { 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_OL_BIT(x)            ((x)&0x4)
 #define ISIS_MASK_LSP_ISTYPE_BITS(x)       ((x)&0x3)
 #define ISIS_MASK_LSP_PARTITION_BIT(x)     ((x)&0x80)
@@ -127,42 +256,63 @@ static const char rcsid[] =
 #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_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)&0x0fff)
+#define ISIS_MASK_MTFLAGS(x)               ((x)&0xf000)
+
+static struct tok isis_mt_flag_values[] = {
+    { 0x4000,                  "sub-TLVs present"},
+    { 0x8000,                  "ATT bit set"},
+    { 0, NULL}
+};
+
 #define ISIS_MASK_TLV_EXT_IP_UPDOWN(x)     ((x)&0x80)
 #define ISIS_MASK_TLV_EXT_IP_SUBTLV(x)     ((x)&0x40)
 
 #define ISIS_MASK_TLV_EXT_IP_UPDOWN(x)     ((x)&0x80)
 #define ISIS_MASK_TLV_EXT_IP_SUBTLV(x)     ((x)&0x40)
 
+#define ISIS_MASK_TLV_EXT_IP6_IE(x)        ((x)&0x40)
+#define ISIS_MASK_TLV_EXT_IP6_SUBTLV(x)    ((x)&0x20)
+
 #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_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
+#define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1)
 
 
-struct isis_lsp_istype_values {
-       u_char id;
-       char   *name;
+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 isis_lsp_istype_values isis_lsp_istype_values[] = {
-       { ISIS_LSP_TYPE_UNUSED0,        "Unused 0x0 (invalid)"},
-       { ISIS_LSP_TYPE_LEVEL_1,        "Level 1 IS"},
-       { ISIS_LSP_TYPE_UNUSED2,        "Unused 0x2 (invalid)"},
-       { ISIS_LSP_TYPE_LEVEL_2,        "Level 2 IS"},
-       { 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}
 };
 
 };
 
-struct isis_nlpid_values {
-       u_char id;
-       char   *name;
+#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 isis_nlpid_values isis_nlpid_values[] = {
-       { NLPID_CLNS,   "CLNS"},
-       { NLPID_IP,     "IPv4"},
-       { NLPID_IP6,    "IPv6"},
-       { 0,            "unknown" }
+static struct tok osi_nlpid_values[] = {
+    { NLPID_CLNS,   "CLNS"},
+    { NLPID_IP,     "IPv4"},
+    { NLPID_IP6,    "IPv6"},
+    { 0, NULL }
 };
 
 /*
 };
 
 /*
@@ -174,104 +324,149 @@ static struct isis_nlpid_values isis_nlpid_values[] = {
 #define ISIS_PTP_ADJ_INIT 1
 #define ISIS_PTP_ADJ_DOWN 2
 
 #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);
 
 
+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_ptp_adjancey_values {
-       u_char id;
-       char   *name;
+struct isis_tlv_ptp_adj {
+    u_int8_t adjacency_state;
+    u_int8_t extd_local_circuit_id[4];
+    u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
+    u_int8_t neighbor_extd_local_circuit_id[4];
 };
 
 };
 
-static struct isis_ptp_adjancey_values isis_ptp_adjancey_values[] = {
-       { ISIS_PTP_ADJ_UP,    "Up" },
-       { ISIS_PTP_ADJ_INIT,  "Initializing" },
-       { ISIS_PTP_ADJ_DOWN,  "Down" }
+static int osi_cksum(const u_int8_t *, u_int);
+static void esis_print(const u_int8_t *, u_int);
+static int isis_print(const u_int8_t *, u_int);
+
+struct isis_metric_block {
+    u_int8_t metric_default;
+    u_int8_t metric_delay;
+    u_int8_t metric_expense;
+    u_int8_t metric_error;
 };
 
 };
 
-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_is_reach {
+    struct isis_metric_block isis_metric_block;
+    u_int8_t neighbor_nodeid[NODE_ID_LEN];
+};
+
+struct isis_tlv_es_reach {
+    struct isis_metric_block isis_metric_block;
+    u_int8_t neighbor_sysid[SYSTEM_ID_LEN];
 };
 
 struct isis_tlv_ip_reach {
 };
 
 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_metric_block isis_metric_block;
+    u_int8_t prefix[4];
+    u_int8_t mask[4];
 };
 
 };
 
-struct isis_tlv_is_reach {
-    u_char virtual_flag;
-    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 }
 };
 
 };
 
+static struct tok isis_restart_flag_values[] = {
+    { 0x1,  "Restart Request"},
+    { 0x2,  "Restart Acknowledgement"},
+    { 0, NULL }
+};
 
 struct isis_common_header {
 
 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;
+    u_int8_t nlpid;
+    u_int8_t fixed_len;
+    u_int8_t version;                  /* Protocol version */
+    u_int8_t id_length;
+    u_int8_t pdu_type;                 /* 3 MSbits are reserved */
+    u_int8_t pdu_version;              /* Packet format version */
+    u_int8_t reserved;
+    u_int8_t max_area;
 };
 
 struct isis_iih_lan_header {
 };
 
 struct isis_iih_lan_header {
-    u_char circuit_type;
-    u_char source_id[SYSTEM_ID_LEN];
-    u_char holding_time[2];
-    u_char packet_len[2];
-    u_char priority;
-    u_char lan_id[SYSTEM_ID_LEN+1];
+    u_int8_t circuit_type;
+    u_int8_t source_id[SYSTEM_ID_LEN];
+    u_int8_t holding_time[2];
+    u_int8_t pdu_len[2];
+    u_int8_t priority;
+    u_int8_t lan_id[NODE_ID_LEN];
 };
 
 struct isis_iih_ptp_header {
 };
 
 struct isis_iih_ptp_header {
-    u_char circuit_type;
-    u_char source_id[SYSTEM_ID_LEN];
-    u_char holding_time[2];
-    u_char packet_len[2];
-    u_char circuit_id;
+    u_int8_t circuit_type;
+    u_int8_t source_id[SYSTEM_ID_LEN];
+    u_int8_t holding_time[2];
+    u_int8_t pdu_len[2];
+    u_int8_t circuit_id;
 };
 
 struct isis_lsp_header {
 };
 
 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;
+    u_int8_t pdu_len[2];
+    u_int8_t remaining_lifetime[2];
+    u_int8_t lsp_id[LSP_ID_LEN];
+    u_int8_t sequence_number[4];
+    u_int8_t checksum[2];
+    u_int8_t typeblock;
 };
 
 struct isis_csnp_header {
 };
 
 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];
+    u_int8_t pdu_len[2];
+    u_int8_t source_id[NODE_ID_LEN];
+    u_int8_t start_lsp_id[LSP_ID_LEN];
+    u_int8_t end_lsp_id[LSP_ID_LEN];
 };
 
 struct isis_psnp_header {
 };
 
 struct isis_psnp_header {
-    u_char pdu_len[2];
-    u_char source_id[SYSTEM_ID_LEN+1];
+    u_int8_t pdu_len[2];
+    u_int8_t source_id[NODE_ID_LEN];
 };
 
 struct isis_tlv_lsp {
 };
 
 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];
+    u_int8_t remaining_lifetime[2];
+    u_int8_t lsp_id[LSP_ID_LEN];
+    u_int8_t sequence_number[4];
+    u_int8_t checksum[2];
 };
 };
-    
+
+
+/* allocate space for the following string
+ * xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx
+ * 50 bytes plus one termination byte */
+static char *
+print_nsap(register const u_int8_t *pptr, register int nsap_length)
+{
+       int nsap_idx;
+       static char nsap_ascii_output[51];
+        char *junk_buf = nsap_ascii_output;
+
+        if (nsap_length < 1 || nsap_length > 20) {
+                snprintf(nsap_ascii_output, sizeof(nsap_ascii_output),
+                    "illegal length");
+                return (nsap_ascii_output);
+        }
+
+       for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
+               if (!TTEST2(*pptr, 1))
+                       return (0);
+               snprintf(junk_buf,
+                   sizeof(nsap_ascii_output) - (junk_buf - nsap_ascii_output),
+                   "%02x", *pptr++);
+               junk_buf += strlen(junk_buf);
+               if (((nsap_idx & 1) == 0) &&
+                     (nsap_idx + 1 < nsap_length)) {
+                       *junk_buf++ = '.';
+               }
+       }
+        *(junk_buf) = '\0';
+       return (nsap_ascii_output);
+}
+
 #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_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))
@@ -279,69 +474,42 @@ struct isis_tlv_lsp {
 #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header))
 #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_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)
+void isoclns_print(const u_int8_t *p, u_int length, u_int caplen)
 {
 {
-       u_char pdu_type;
-       struct isis_common_header *header;
-       
-       header = (struct isis_common_header *)p;
+       u_int8_t pdu_type;
+       const struct isis_common_header *header;
+
+       header = (const struct isis_common_header *)p;
        pdu_type = header->pdu_type & PDU_TYPE_MASK;
 
        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;
-       }
+        printf("%sOSI", caplen < 1 ? "|" : "");
+
+        if (caplen < 1) /* enough bytes on the wire ? */
+                return;
 
        switch (*p) {
 
        case NLPID_CLNS:
 
        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));
+               (void)printf(", CLNS, length %u", length);
                break;
 
        case NLPID_ESIS:
                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:
                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))
                if (!isis_print(p, length))
-                   default_print_unaligned(p, caplen);
+                        print_unknown_data(p,"\n\t",caplen);
                break;
 
        case NLPID_NULLNS:
                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));
+               (void)printf(", ISO NULLNS, length: %u", length);
                break;
 
        default:
                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));
+               (void)printf(", Unknown NLPID 0x%02x, length: %u", p[0], length);
                if (caplen > 1)
                if (caplen > 1)
-                       default_print_unaligned(p, caplen);
+                        print_unknown_data(p,"\n\t",caplen);
                break;
        }
 }
                break;
        }
 }
@@ -350,29 +518,37 @@ void isoclns_print(const u_char *p, u_int length, u_int caplen,
 #define        ESIS_ESH        2
 #define        ESIS_ISH        4
 
 #define        ESIS_ESH        2
 #define        ESIS_ISH        4
 
+static struct tok esis_values[] = {
+    { ESIS_REDIRECT, "redirect"},
+    { ESIS_ESH,      "ESH"},
+    { ESIS_ISH,      "ISH"},
+    { 0, NULL }
+};
+
 struct esis_hdr {
 struct esis_hdr {
-       u_char version;
-       u_char reserved;
-       u_char type;
-       u_char tmo[2];
-       u_char cksum[2];
+       u_int8_t version;
+       u_int8_t reserved;
+       u_int8_t type;
+       u_int8_t tmo[2];
+       u_int8_t cksum[2];
 };
 
 static void
 };
 
 static void
-esis_print(const u_char *p, u_int length)
+esis_print(const u_int8_t *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 off[2];
+       const u_int8_t *ep;
+       u_int li;
+       const struct esis_hdr *eh;
 
 
-       if (length == 2) {
+       if (length <= 2) {
                if (qflag)
                        printf(" bad pkt!");
                else
                        printf(" no header at all!");
                return;
        }
                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)
        ep = p + li;
        if (li > length) {
                if (qflag)
@@ -391,28 +567,16 @@ esis_print(const u_char *p, u_int length)
                }
                return;
        }
                }
                return;
        }
-       switch (eh->type & 0x1f) {
 
 
-       case ESIS_REDIRECT:
-               printf(" redirect");
-               break;
+        printf(", ES-IS, %s, length %u",
+               tok2str(esis_values,"unknown type: %u",eh->type & 0x1f),
+               length);
 
 
-       case ESIS_ESH:
-               printf(" esh");
-               break;
+        if(vflag < 1)
+               return;
 
 
-       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)",
+       if (vflag && osi_cksum(p, li)) {
+               printf(" bad cksum (got 0x%02x%02x)",
                       eh->cksum[1], eh->cksum[0]);
                default_print(p, length);
                return;
                       eh->cksum[1], eh->cksum[0]);
                default_print(p, length);
                return;
@@ -426,12 +590,12 @@ esis_print(const u_char *p, u_int length)
 
        switch (eh->type & 0x1f) {
        case ESIS_REDIRECT: {
 
        switch (eh->type & 0x1f) {
        case ESIS_REDIRECT: {
-               const u_char *dst, *snpa, *is;
+               const u_int8_t *dst, *snpa, *is;
 
                dst = p; p += *p + 1;
                if (p > snapend)
                        return;
 
                dst = p; p += *p + 1;
                if (p > snapend)
                        return;
-               printf("\n\t\t\t %s", isonsap_string(dst));
+               printf("\n\t\t %s", isonsap_string(dst));
                snpa = p; p += *p + 1;
                is = p;   p += *p + 1;
                if (p > snapend)
                snpa = p; p += *p + 1;
                is = p;   p += *p + 1;
                if (p > snapend)
@@ -447,13 +611,12 @@ esis_print(const u_char *p, u_int length)
                li = ep - p;
                break;
        }
                li = ep - p;
                break;
        }
-#if 0
+
        case ESIS_ESH:
        case ESIS_ESH:
-               printf(" esh");
                break;
                break;
-#endif
+
        case ESIS_ISH: {
        case ESIS_ISH: {
-               const u_char *is;
+               const u_int8_t *is;
 
                is = p; p += *p + 1;
                if (p > ep) {
 
                is = p; p += *p + 1;
                if (p > ep) {
@@ -463,188 +626,499 @@ esis_print(const u_char *p, u_int length)
                if (p > snapend)
                        return;
                if (!qflag)
                if (p > snapend)
                        return;
                if (!qflag)
-                       printf("\n\t\t\t %s", isonsap_string(is));
+                       printf("\n\tNET: %s", print_nsap(is+1,*is));
                li = ep - p;
                break;
        }
 
        default:
                li = ep - p;
                break;
        }
 
        default:
-               (void)printf(" len=%d", length);
-               if (length && p < snapend) {
-                       length = snapend - p;
-                       default_print(p, length);
-               }
-               return;
+            if (vflag <= 1) {
+                   if (p < snapend) 
+                            print_unknown_data(p,"\n\t  ",snapend-p);
+            }
+            return;
        }
        }
+
+        /* hexdump - FIXME ? */
+        if (vflag > 1) {
+                    if (p < snapend)
+                            print_unknown_data(p,"\n\t  ",snapend-p);
+        }
        if (vflag)
                while (p < ep && li) {
        if (vflag)
                while (p < ep && li) {
-                       int op, opli;
-                       const u_char *q;
+                       u_int op, opli;
+                       const u_int8_t *q;
 
                        if (snapend - p < 2)
                                return;
                        if (li < 2) {
 
                        if (snapend - p < 2)
                                return;
                        if (li < 2) {
-                               printf(" bad opts/li");
+                               printf(", bad opts/li");
                                return;
                        }
                        op = *p++;
                        opli = *p++;
                        li -= 2;
                        if (opli > li) {
                                return;
                        }
                        op = *p++;
                        opli = *p++;
                        li -= 2;
                        if (opli > li) {
-                               printf(" opt (%d) too long", op);
+                               printf(", opt (%d) too long", op);
                                return;
                        }
                        li -= opli;
                        q = p;
                        p += opli;
                                return;
                        }
                        li -= opli;
                        q = p;
                        p += opli;
+
                        if (snapend < p)
                                return;
                        if (snapend < p)
                                return;
-                       if (op == 198 && opli == 2) {
-                               printf(" tmo=%d", q[0] * 256 + q[1]);
+
+                       if (op == TLV_HOLDTIME && opli == 2) {
+                               printf("\n\tholdtime: %us", EXTRACT_16BITS(q));
+                               continue;
+                       }
+
+                       if (op == TLV_PROTOCOLS && opli >= 1) {
+                               printf("\n\t%s (length: %u): %s",
+                                       tok2str(isis_tlv_values, "unknown", op),
+                                       opli,
+                                       tok2str(osi_nlpid_values,"Unknown 0x%02x",*q));
                                continue;
                        }
                                continue;
                        }
-                       printf (" %d:<", op);
-                       while (--opli >= 0)
-                               printf("%02x", *q++);
-                       printf (">");
+
+                        print_unknown_data(q,"\n\t  ",opli);
                }
 }
 
                }
 }
 
-/*
- * print_nsap
- * Print out an NSAP. 
- */
-
-static void
-print_nsap (register const u_char *cp, register int length)
+/* shared routine for printing system, node and lsp-ids
+ * allocate space for the worst-case string
+ * xxxx.xxxx.xxxx.yy-zz
+ * 20 bytes plus one termination byte */
+static char *
+isis_print_id(const u_int8_t *cp, int id_len)
 {
     int i;
 {
     int i;
-    
-    for (i = 0; i < length; i++) {
-       printf("%02x", *cp++);
-       if (((i & 1) == 0) && (i + 1 < length)) {
-           printf(".");
+    static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")];
+    char *pos = id;
+
+    for (i = 1; i <= SYSTEM_ID_LEN; i++) {
+        snprintf(pos, sizeof(id) - (pos - id), "%02x", *cp++);
+       pos += strlen(pos);
+       if (i == 2 || i == 4)
+           *pos++ = '.';
        }
        }
-
+    if (id_len >= NODE_ID_LEN) {
+        snprintf(pos, sizeof(id) - (pos - id), ".%02x", *cp++);
+       pos += strlen(pos);
     }
     }
+    if (id_len == LSP_ID_LEN)
+        snprintf(pos, sizeof(id) - (pos - id), "-%02x", *cp);
+    return (id);
 }
 
 }
 
-static void
-isis_print_sysid (const u_char *cp)
+/* print the 4-byte metric block which is common found in the old-style TLVs */
+static int
+isis_print_metric_block (const struct isis_metric_block *isis_metric_block)
 {
 {
-    int i;
-    for (i=1;i<=6;i++) {
-        printf("%02x",*cp++);
-       if ( (i==2)^(i==4) ) {
-           printf(".");
-       }
-    }
+    printf(", Default Metric: %d, %s",
+           ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_default),
+           ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_default) ? "External" : "Internal");
+    if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_delay))
+        printf("\n\t\t  Delay Metric: %d, %s",
+               ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_delay),
+               ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_delay) ? "External" : "Internal");
+    if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_expense))
+        printf("\n\t\t  Expense Metric: %d, %s",
+               ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_expense),
+               ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_expense) ? "External" : "Internal");
+    if (!ISIS_LSP_TLV_METRIC_SUPPORTED(isis_metric_block->metric_error))
+        printf("\n\t\t  Error Metric: %d, %s",
+               ISIS_LSP_TLV_METRIC_VALUE(isis_metric_block->metric_error),
+               ISIS_LSP_TLV_METRIC_IE(isis_metric_block->metric_error) ? "External" : "Internal");
+
+    return(1); /* everything is ok */
 }
 
 }
 
-static void
-isis_print_nodeid (const u_char *cp)
+static int
+isis_print_tlv_ip_reach (const u_int8_t *cp, const char *ident, int length)
 {
 {
-    int i;
-    for (i=1;i<=7;i++) {
-        printf("%02x",*cp++);
-       if ((i & 1) == 0) {
-           printf(".");
+       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 ((size_t)length < sizeof(*tlv_ip_reach)) {
+                       printf("short IPv4 Reachability (%d vs %lu)",
+                               length,
+                               (unsigned long)sizeof(*tlv_ip_reach));
+                       return (0);
+               }
+
+               if (!TTEST(*tlv_ip_reach))
+                   return (0);
+
+               prefix_len = mask2plen(EXTRACT_32BITS(tlv_ip_reach->mask));
+
+               if (prefix_len == -1)
+                       printf("%sIPv4 prefix: %s mask %s",
+                               ident,
+                              ipaddr_string((tlv_ip_reach->prefix)),
+                              ipaddr_string((tlv_ip_reach->mask)));
+               else
+                       printf("%sIPv4 prefix: %15s/%u",
+                               ident,
+                              ipaddr_string((tlv_ip_reach->prefix)),
+                              prefix_len);
+
+               printf(", Distribution: %s, Metric: %u, %s",
+                       ISIS_LSP_TLV_METRIC_UPDOWN(tlv_ip_reach->isis_metric_block.metric_default) ? "down" : "up",
+                       ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_default),
+                       ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_default) ? "External" : "Internal");
+
+               if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_delay))
+                    printf("%s  Delay Metric: %u, %s",
+                           ident,
+                           ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_delay),
+                           ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_delay) ? "External" : "Internal");
+                
+               if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_expense))
+                    printf("%s  Expense Metric: %u, %s",
+                           ident,
+                           ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_expense),
+                           ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_expense) ? "External" : "Internal");
+                
+               if (!ISIS_LSP_TLV_METRIC_SUPPORTED(tlv_ip_reach->isis_metric_block.metric_error))
+                    printf("%s  Error Metric: %u, %s",
+                           ident,
+                           ISIS_LSP_TLV_METRIC_VALUE(tlv_ip_reach->isis_metric_block.metric_error),
+                           ISIS_LSP_TLV_METRIC_IE(tlv_ip_reach->isis_metric_block.metric_error) ? "External" : "Internal");
+
+               length -= sizeof(struct isis_tlv_ip_reach);
+               tlv_ip_reach++;
        }
        }
-    }
+       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(".");
+/*
+ * this is the common IP-REACH subTLV decoder it is called
+ * from various EXTD-IP REACH TLVs (135,235,236,237)
+ */
+
+static int
+isis_print_ip_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
+
+        /* first lets see if we know the subTLVs name*/
+       printf("%s%s subTLV #%u, length: %u",
+              ident,
+               tok2str(isis_ext_ip_reach_subtlv_values,
+                       "unknown",
+                       subt),
+               subt,
+               subl);
+
+       if (!TTEST2(*tptr,subl))
+           goto trunctlv;
+
+    switch(subt) {
+    case SUBTLV_IP_REACH_ADMIN_TAG32:
+        while (subl >= 4) {
+           printf(", 0x%08x (=%u)",
+                  EXTRACT_32BITS(tptr),
+                  EXTRACT_32BITS(tptr));
+           tptr+=4;
+           subl-=4;
+       }
+       break;
+    case SUBTLV_IP_REACH_ADMIN_TAG64:
+        while (subl >= 8) {
+           printf(", 0x%08x%08x",
+                  EXTRACT_32BITS(tptr),
+                  EXTRACT_32BITS(tptr+4));
+           tptr+=8;
+           subl-=8;
        }
        }
-       printf("-%02x",*cp);
+       break;
+    default:
+       if(!print_unknown_data(tptr,"\n\t\t    ",
+                              subl))
+         return(0);
+       break;
+    }
+    return(1);
+       
+trunctlv:
+    printf("%spacket exceeded snapshot",ident);
+    return(0);
 }
 
 }
 
-static void
-isis_print_tlv_ip_reach (const u_char *cp, int length)
-{
-      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
-       }; 
-
-         int mask,prefix_len;
-
-         struct isis_tlv_ip_reach *tlv_ip_reach;
-         tlv_ip_reach = (struct isis_tlv_ip_reach *)cp;
-
-         while ( length > 0 ) {
-               if (length<12) {
-                 printf("short IP reachability (%d vs 12)", length );
-                       return;
-               }
+/*
+ * this is the common IS-REACH subTLV decoder it is called
+ * from isis_print_ext_is_reach()
+ */
+
+static int
+isis_print_is_reach_subtlv (const u_int8_t *tptr,int subt,int subl,const char *ident) {
+
+        int priority_level;
+        union { /* int to float conversion buffer for several subTLVs */
+            float f; 
+            u_int32_t i;
+        } bw;
+
+        /* first lets see if we know the subTLVs name*/
+       printf("%s%s subTLV #%u, length: %u",
+              ident,
+               tok2str(isis_ext_is_reach_subtlv_values,
+                       "unknown",
+                       subt),
+               subt,
+               subl);
+
+       if (!TTEST2(*tptr,subl))
+           goto trunctlv;
+
+        switch(subt) {
+        case SUBTLV_EXT_IS_REACH_ADMIN_GROUP:      
+        case SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID:
+        case SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID:
+            printf(", 0x%08x", EXTRACT_32BITS(tptr));
+           if (subl == 8) /* draft-ietf-isis-gmpls-extensions */
+             printf(", 0x%08x", EXTRACT_32BITS(tptr+4));
+           break;
+        case SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
+        case SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
+            printf(", %s", ipaddr_string(tptr));
+            break;
+        case SUBTLV_EXT_IS_REACH_MAX_LINK_BW :
+       case SUBTLV_EXT_IS_REACH_RESERVABLE_BW:  
+            bw.i = EXTRACT_32BITS(tptr);
+            printf(", %.3f Mbps", bw.f*8/1000000 );
+            break;
+        case SUBTLV_EXT_IS_REACH_UNRESERVED_BW :
+            for (priority_level = 0; priority_level < 8; priority_level++) {
+                bw.i = EXTRACT_32BITS(tptr);
+                printf("%s  priority level %d: %.3f Mbps",
+                       ident,
+                       priority_level,
+                       bw.f*8/1000000 );
+               tptr+=4;
+            }
+            break;
+        case SUBTLV_EXT_IS_REACH_TE_METRIC:
+            printf(", %u", EXTRACT_24BITS(tptr));
+            break;
+        case SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE:
+            printf(", %s, Priority %u",
+                  bittok2str(gmpls_link_prot_values, "none", *tptr),
+                   *(tptr+1));
+            break;
+        case SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR:
+            printf("%s  Interface Switching Capability:%s",
+                   ident,
+                   tok2str(gmpls_switch_cap_values, "Unknown", *(tptr)));
+            printf(", LSP Encoding: %s",
+                   tok2str(gmpls_encoding_values, "Unknown", *(tptr+1)));
+           tptr+=4;
+            printf("%s  Max LSP Bandwidth:",ident);
+            for (priority_level = 0; priority_level < 8; priority_level++) {
+                bw.i = EXTRACT_32BITS(tptr);
+                printf("%s    priority level %d: %.3f Mbps",
+                       ident,
+                       priority_level,
+                       bw.f*8/1000000 );
+               tptr+=4;
+            }
+            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(!print_unknown_data(tptr,"\n\t\t    ",
+                                      subl-36))
+                    return(0);
+            }
+            break;
+        default:
+            if(!print_unknown_data(tptr,"\n\t\t    ",
+                                  subl))
+                return(0);
+            break;
+        }
+        return(1);
 
 
-               mask=EXTRACT_32BITS(tlv_ip_reach->mask);
-               prefix_len=0;
+trunctlv:
+    printf("%spacket exceeded snapshot",ident);
+    return(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++;
-       }
+
+/*
+ * this is the common IS-REACH decoder it is called
+ * from various EXTD-IS REACH style TLVs (22,24,222)
+ */
+
+static int
+isis_print_ext_is_reach (const u_int8_t *tptr,const char *ident, int tlv) {
+
+    char ident_buffer[20];
+    int subt,subl,tslen;
+    int proc_bytes = 0; /* how many bytes did we process ? */
+    
+    if (!TTEST2(*tptr, NODE_ID_LEN))
+        return(0);
+
+    printf("%sIS Neighbor: %s", ident, isis_print_id(tptr, NODE_ID_LEN));
+    tptr+=(NODE_ID_LEN);
+
+    if (tlv != TLV_IS_ALIAS_ID) {
+        if (!TTEST2(*tptr, 3))
+           return(0);
+       printf(", Metric: %d",EXTRACT_24BITS(tptr));
+       tptr+=3;
+    }
+        
+    if (!TTEST2(*tptr, 1))
+        return(0);
+    tslen=*(tptr++); /* read out subTLV length */
+    proc_bytes=NODE_ID_LEN+3+1;
+    printf(", %ssub-TLVs present",tslen ? "" : "no ");
+    if (tslen) {
+        printf(" (%u)",tslen);
+        while (tslen>0) {
+            if (!TTEST2(*tptr,2))
+                return(0);
+            subt=*(tptr++);
+            subl=*(tptr++);
+            /* prepend the ident string */
+            snprintf(ident_buffer, sizeof(ident_buffer), "%s  ",ident);
+            if(!isis_print_is_reach_subtlv(tptr,subt,subl,ident_buffer))
+                return(0);
+            tptr+=subl;
+            tslen-=(subl+2);
+            proc_bytes+=(subl+2);
+        }
+    }
+    return(proc_bytes);
+}
+
+/*
+ * this is the common Multi Topology ID decoder
+ * it is called from various MT-TLVs (222,229,235,237)
+ */
+
+static int
+isis_print_mtid (const u_int8_t *tptr,const char *ident) {
+    
+    if (!TTEST2(*tptr, 2))
+        return(0);
+
+    printf("%s%s",
+           ident,
+           tok2str(isis_mt_values,
+                   "Reserved for IETF Consensus",
+                   ISIS_MASK_MTID(EXTRACT_16BITS(tptr))));
+
+    printf(" Topology (0x%03x), Flags: [%s]",
+           ISIS_MASK_MTID(EXTRACT_16BITS(tptr)),
+           bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(EXTRACT_16BITS(tptr))));
+
+    return(2);
+}
+
+/*
+ * this is the common extended IP reach decoder
+ * it is called from TLVs (135,235,236,237)
+ * we process the TLV and optional subTLVs and return
+ * the amount of processed bytes
+ */
+
+static int
+isis_print_extd_ip_reach (const u_int8_t *tptr, const char *ident, u_int16_t afi) {
+
+    char ident_buffer[20];
+    u_int8_t prefix[16]; /* shared copy buffer for IPv4 and IPv6 prefixes */
+    u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen;
+
+    if (!TTEST2(*tptr, 4))
+        return (0);
+    metric = EXTRACT_32BITS(tptr);
+    processed=4;
+    tptr+=4;
+    
+    if (afi == IPV4) {
+        if (!TTEST2(*tptr, 1)) /* fetch status byte */
+            return (0);
+        status_byte=*(tptr++);
+        bit_length = status_byte&0x3f;
+        processed++;
+#ifdef INET6
+    } else if (afi == IPV6) {
+        if (!TTEST2(*tptr, 1)) /* fetch status & prefix_len byte */
+            return (0);
+        status_byte=*(tptr++);
+        bit_length=*(tptr++);
+        processed+=2;
+#endif
+    } else
+        return (0); /* somebody is fooling us */
+
+    byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */
+   
+    if (!TTEST2(*tptr, byte_length))
+        return (0);
+    memset(prefix, 0, 16);              /* clear the copy buffer */
+    memcpy(prefix,tptr,byte_length);    /* copy as much as is stored in the TLV */
+    tptr+=byte_length;
+    processed+=byte_length;
+
+    if (afi == IPV4)
+        printf("%sIPv4 prefix: %15s/%u",
+               ident,
+               ipaddr_string(prefix),
+               bit_length);
+#ifdef INET6
+    if (afi == IPV6)
+        printf("%sIPv6 prefix: %s/%u",
+               ident,
+               ip6addr_string(prefix),
+               bit_length);
+#endif 
+   
+    printf(", Distribution: %s, Metric: %u",
+           ISIS_MASK_TLV_EXT_IP_UPDOWN(status_byte) ? "down" : "up",
+           metric);
+
+    if (afi == IPV4 && ISIS_MASK_TLV_EXT_IP_SUBTLV(status_byte))
+        printf(", sub-TLVs present");
+#ifdef INET6
+    if (afi == IPV6)
+        printf(", %s%s",
+               ISIS_MASK_TLV_EXT_IP6_IE(status_byte) ? "External" : "Internal",
+               ISIS_MASK_TLV_EXT_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : "");
+#endif
+    
+    if ((ISIS_MASK_TLV_EXT_IP_SUBTLV(status_byte)  && afi == IPV4) ||
+        (ISIS_MASK_TLV_EXT_IP6_SUBTLV(status_byte) && afi == IPV6)) {
+        /* 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 (0);
+        sublen=*(tptr++);
+        processed+=sublen+1;
+        printf(" (%u)",sublen);   /* print out subTLV length */
+        
+        while (sublen>0) {
+            if (!TTEST2(*tptr,2))
+                return (0);
+            subtlvtype=*(tptr++);
+            subtlvlen=*(tptr++);
+            /* prepend the ident string */
+            snprintf(ident_buffer, sizeof(ident_buffer), "%s  ",ident);
+            if(!isis_print_ip_reach_subtlv(tptr,subtlvtype,subtlvlen,ident_buffer))
+                return(0);
+            tptr+=subtlvlen;
+            sublen-=(subtlvlen+2);
+        }
+    }
+    return (processed);
 }
 
 /*
 }
 
 /*
@@ -652,638 +1126,876 @@ isis_print_tlv_ip_reach (const u_char *cp, int length)
  * Decode IS-IS packets.  Return 0 on error.
  */
 
  * Decode IS-IS packets.  Return 0 on error.
  */
 
-static int isis_print (const u_char *p, u_int length)
+static int isis_print (const u_int8_t *p, u_int length)
 {
 {
-    struct isis_common_header *header;
-
-    struct isis_iih_lan_header *header_iih_lan;
-    struct isis_iih_ptp_header *header_iih_ptp;
-    struct isis_lsp_header *header_lsp;
-    struct isis_csnp_header *header_csnp;
-    struct isis_psnp_header *header_psnp;
-
-    struct isis_tlv_lsp *tlv_lsp;
-    struct isis_tlv_ptp_adj *tlv_ptp_adj;
-    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_short packet_len;
-    int i,j,bit_length,byte_length,metric;
-    u_char prefix[4];
-    u_char off[2];
-    float bw;
+    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;
+    const struct isis_tlv_es_reach *tlv_es_reach;
+
+    u_int8_t pdu_type, max_area, id_length, tlv_type, tlv_len, tmp, alen, lan_alen, prefix_len;
+    u_int8_t ext_is_len, ext_ip_len, mt_len;
+    const u_int8_t *optr, *pptr, *tptr;
+    u_short packet_len,pdu_len;
+    u_int i;
 
     packet_len=length;
 
     packet_len=length;
-    optr = p; /* initialize the _o_riginal pointer - need it for parsing the checksum TLV */
-    header = (struct isis_common_header *)p; 
-    pptr = p+(ISIS_COMMON_HEADER_SIZE);    
-    header_iih_lan = (struct isis_iih_lan_header *)pptr;
-    header_iih_ptp = (struct isis_iih_ptp_header *)pptr;
-    header_lsp = (struct isis_lsp_header *)pptr;
-    header_csnp = (struct isis_csnp_header *)pptr;
-    header_psnp = (struct isis_psnp_header *)pptr;
-    
+    optr = p; /* initialize the _o_riginal pointer to the packet start -
+                 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.
      */
     /*
      * 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);
 
     if (header->version != ISIS_VERSION) {
        printf(", version %d packet not supported", header->version);
-       return(0);
+       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);
     }
 
     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);
+       return (0);
     }
     }
-    
-    if (header->pkt_version != ISIS_VERSION) {
-       printf(", version %d packet not supported", header->pkt_version);
-       return(0);
+
+    if (header->pdu_version != ISIS_VERSION) {
+       printf(", version %d packet not supported", header->pdu_version);
+       return (0);
     }
 
     max_area = header->max_area;
     switch(max_area) {
     case 0:
     }
 
     max_area = header->max_area;
     switch(max_area) {
     case 0:
-       max_area = 3;                   /* silly shit */
+       max_area = 3;    /* silly shit */
        break;
     case 255:
        printf(", bad packet -- 255 areas");
        break;
     case 255:
        printf(", bad packet -- 255 areas");
-       return(0);
+       return (0);
     default:
        break;
     }
 
     default:
        break;
     }
 
-    printf(", hlen: %u, v: %u, sys-id-len: 6 (0), max-area: %u (%u)",
+    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:
+        break;
+    }
+
+    /* toss any non 6-byte sys-ID len PDUs */
+    if (id_length != 6 ) { 
+       printf(", bad packet -- illegal sys-ID length (%u)", id_length);
+       return (0);
+    }
+
+    pdu_type=header->pdu_type;
+
+    /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/
+    if (vflag < 1) {
+        printf(", IS-IS, %s",
+               tok2str(isis_pdu_values,"unknown PDU-Type %u",pdu_type));
+
+       switch (pdu_type) {
+
+       case L1_LAN_IIH:
+       case L2_LAN_IIH:
+           printf(", source-id %s",
+                   isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN));
+           printf(", DIS lan-id %s",
+                   isis_print_id(header_iih_lan->lan_id,NODE_ID_LEN));
+           break;
+       case PTP_IIH:
+           printf(", source-id %s", isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN));
+           break;
+       case L1_LSP:
+       case L2_LSP:
+           printf(", lsp-id %s, seq 0x%08x, lifetime %5us",
+                  isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
+                  EXTRACT_32BITS(header_lsp->sequence_number),
+                  EXTRACT_16BITS(header_lsp->remaining_lifetime));
+           break;
+       case L1_CSNP:
+       case L2_CSNP:
+           printf(", source-id %s", isis_print_id(header_csnp->source_id,SYSTEM_ID_LEN));
+           break;
+       case L1_PSNP:
+       case L2_PSNP:
+           printf(", source-id %s", isis_print_id(header_psnp->source_id,SYSTEM_ID_LEN));
+           break;
+
+       }
+       printf(", length %u", length);
+
+        return(1);
+    }
+
+    /* ok they seem to want to know everything - lets fully decode it */
+    printf(", IS-IS, length: %u",length);
+
+    printf("\n\t%s, hlen: %u, v: %u, pdu-v: %u, sys-id-len: %u (%u), max-area: %u (%u)",
+           tok2str(isis_pdu_values,
+                   "unknown, type %u",
+                   pdu_type),
            header->fixed_len,
            header->fixed_len,
-           header->pkt_version,
+           header->version,
+           header->pdu_version,
+          id_length,
+          header->id_length,
            max_area,
            header->max_area);
            max_area,
            header->max_area);
-           
-    pdu_type=header->pdu_type;
-     
+
+    if (vflag > 1) {
+        if(!print_unknown_data(optr,"\n\t",8)) /* provide the _o_riginal pointer */
+            return(0);                         /* for optionally debugging the common header */
+    }
+
     switch (pdu_type) {
 
     switch (pdu_type) {
 
-    case L1_LAN_IIH:    
+    case L1_LAN_IIH:
     case L2_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 %u",
-                       header->fixed_len, ISIS_IIH_LAN_HEADER_SIZE);
-                   return(0);
-               }
-            printf(", L%s Lan IIH",
-                          ISIS_MASK_LEVEL_BITS(pdu_type) ? "2" : "1"); 
-            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);
+       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  source-id:  %s,  holding time: %us, Flags: [%s]",
+               isis_print_id(header_iih_lan->source_id,SYSTEM_ID_LEN),
+               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  DIS lan-id: %s, Priority: %u, PDU length: %u",
+               isis_print_id(header_iih_lan->lan_id, NODE_ID_LEN),
+               (header_iih_lan->priority) & PRIORITY_MASK,
+               pdu_len);
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_IIH_LAN_HEADER_SIZE))
+                return(0);
+        }
+
+       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:
        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 %u",
-                       header->fixed_len, ISIS_IIH_PTP_HEADER_SIZE);
-                   return(0);
-               }
-           printf(", PTP IIH");
-
-            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);
+       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  source-id: %s, holding time: %us, Flags: [%s]",
+               isis_print_id(header_iih_ptp->source_id,SYSTEM_ID_LEN),
+               EXTRACT_16BITS(header_iih_ptp->holding_time),
+               tok2str(isis_iih_circuit_type_values,
+                       "unknown circuit type 0x%02x",
+                       header_iih_ptp->circuit_type));
+
+       printf("\n\t  circuit-id: 0x%02x, PDU length: %u",
+               header_iih_ptp->circuit_id,
+               pdu_len);
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_IIH_PTP_HEADER_SIZE))
+                return(0);
+        }
+
+       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:
        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 %u",
-                       header->fixed_len, ISIS_LSP_HEADER_SIZE);
-                   return(0);
-               }
-           if ( pdu_type == L1_LSP)    
-               printf(", L1 LSP");
-           if ( pdu_type == L2_LSP)    
-               printf(", L2 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", isis_lsp_istype_values[ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock)].name);
+       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);
+       }
 
 
-            packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
-            pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE);
-        break;
+       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  lsp-id: %s, seq: 0x%08x, lifetime: %5us",
+               isis_print_id(header_lsp->lsp_id, LSP_ID_LEN),
+               EXTRACT_32BITS(header_lsp->sequence_number),
+               EXTRACT_16BITS(header_lsp->remaining_lifetime));
+        /* verify the checksum -
+         * checking starts at the lsp-id field
+         * which is 12 bytes after the packet start*/
+       printf("\n\t  chksum: 0x%04x (%s), PDU length: %u",
+               EXTRACT_16BITS(header_lsp->checksum),
+               (osi_cksum(optr+12, length-12)) ? "incorrect" : "correct",
+               pdu_len);
+
+       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)));
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_LSP_HEADER_SIZE))
+                return(0);
+        }
+
+       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:
 
     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 %u",
-                       header->fixed_len, ISIS_CSNP_HEADER_SIZE);
-                   return(0);
-               }
-            printf(", L%s CSNP", ISIS_MASK_LEVEL_BITS(pdu_type) ? "2" : "1");
-               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);
+       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  source-id:    %s, PDU length: %u",
+               isis_print_id(header_csnp->source_id, NODE_ID_LEN),
+               pdu_len);
+       printf("\n\t  start lsp-id: %s",
+               isis_print_id(header_csnp->start_lsp_id, LSP_ID_LEN));
+       printf("\n\t  end lsp-id:   %s",
+               isis_print_id(header_csnp->end_lsp_id, LSP_ID_LEN));
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_CSNP_HEADER_SIZE))
+                return(0);
+        }
+
+       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:
         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 %u",
-                       header->fixed_len, ISIS_PSNP_HEADER_SIZE);
-                   return(0);
-               }
-           printf(", L%s PSNP", ISIS_MASK_LEVEL_BITS(pdu_type) ? "2" : "1");
-               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;
+       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  source-id:    %s, PDU length: %u",
+               isis_print_id(header_psnp->source_id, NODE_ID_LEN),
+               pdu_len);
+
+        if (vflag > 1) {
+            if(!print_unknown_data(pptr,"\n\t  ",ISIS_PSNP_HEADER_SIZE))
+                return(0);
+        }
+
+       packet_len -= (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
+       pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE);
+       break;
+
     default:
     default:
-            printf(", PDU type (0x%02x) not supported", pdu_type);
-            return(1);
+       if(!print_unknown_data(pptr,"\n\t  ",length))
+           return(0);
+       return (0);
     }
 
     /*
      * Now print the TLV's.
      */
     }
 
     /*
      * Now print the TLV's.
      */
-    
+
     while (packet_len >= 2) {
         if (pptr == snapend) {
     while (packet_len >= 2) {
         if (pptr == snapend) {
-           return(1);
+           return (1);
         }
 
         }
 
-       if (pptr >= snapend) {
-           printf("\n\t\t\t packet exceeded snapshot (%d) bytes",pptr-snapend);
-           return(1);
+       if (!TTEST2(*pptr, 2)) {
+           printf("\n\t\t packet exceeded snapshot (%ld) bytes",
+                   (long)(pptr-snapend));
+           return (1);
        }
        }
-       type = *pptr++;
-       len = *pptr++;
+       tlv_type = *pptr++;
+       tlv_len = *pptr++;
+        tmp =tlv_len; /* copy temporary len & pointer to packet data */
+        tptr = pptr;
        packet_len -= 2;
        packet_len -= 2;
-       if (len > packet_len) {
+       if (tlv_len > packet_len) {
            break;
        }
            break;
        }
-       printf("\n\t\t    ");
 
 
-       switch (type) {
+        /* first lets see if we know the TLVs name*/
+       printf("\n\t    %s TLV #%u, length: %u",
+               tok2str(isis_tlv_values,
+                       "unknown",
+                       tlv_type),
+               tlv_type,
+               tlv_len);
+
+        /* now check if we have a decoder otherwise do a hexdump at the end*/
+       switch (tlv_type) {
        case TLV_AREA_ADDR:
        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) {
            alen = *tptr++;
            while (tmp && alen < tmp) {
-               printf("\n\t\t\tArea address (%u): ",alen);
-               print_nsap(tptr, alen);
+               printf("\n\t      Area address (length: %u): %s",
+                       alen,
+                       print_nsap(tptr, alen));
                tptr += alen;
                tmp -= alen + 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:
                alen = *tptr++;
            }
            break;
        case TLV_ISNEIGH:
-           printf("IS Neighbor(s) (%u)",len);
-           tmp = len;
-           tptr = pptr;
            while (tmp >= ETHER_ADDR_LEN) {
            while (tmp >= ETHER_ADDR_LEN) {
-               printf("\n\t\t\tIS Neighbor: ");
-               isis_print_sysid(tptr);
-               tmp -= ETHER_ADDR_LEN;
-               tptr += ETHER_ADDR_LEN;
+                if (!TTEST2(*tptr, ETHER_ADDR_LEN))
+                    goto trunctlv;
+                printf("\n\t      SNPA: %s",isis_print_id(tptr,ETHER_ADDR_LEN));
+                tmp -= ETHER_ADDR_LEN;
+                tptr += ETHER_ADDR_LEN;
            }
            break;
 
            }
            break;
 
+        case TLV_ISNEIGH_VARLEN:
+            if (!TTEST2(*tptr, 1))
+               goto trunctlv;
+           lan_alen = *tptr++; /* LAN adress length */
+            tmp --;
+            printf("\n\t      LAN address length %u bytes ",lan_alen);
+           while (tmp >= lan_alen) {
+                if (!TTEST2(*tptr, lan_alen))
+                    goto trunctlv;
+                printf("\n\t\tIS Neighbor: %s",isis_print_id(tptr,lan_alen));
+                tmp -= lan_alen;
+                tptr +=lan_alen;
+            }
+            break;
+
        case TLV_PADDING:
        case TLV_PADDING:
-           printf("Padding (%u)", len);
            break;
 
         case TLV_MT_IS_REACH:
            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");
-               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");
-               }
-                       printf(" Topology (0x%03x)",EXTRACT_16BITS(tptr)&0x0fff);
-                tptr+=2;
-               printf("\n\t\t\t  IS Neighbor: ");
-                isis_print_nodeid(tptr);
-                tptr+=(SYSTEM_ID_LEN+1);
-                printf(", Metric: %d",EXTRACT_24BITS(tptr));
-                tptr+=3;
-                tslen=*(tptr++);
-                printf(", %ssub-TLVs present",tslen ? "" : "no ");
-       
-                tptr+=tslen;
-                tmp-=(13+tslen);
+            while (tmp >= 2+NODE_ID_LEN+3+1) {
+                mt_len = isis_print_mtid(tptr, "\n\t      ");
+                if (mt_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=mt_len;
+                tmp-=mt_len;
+
+                ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
+                if (ext_is_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                   
+                tmp-=ext_is_len;
+                tptr+=ext_is_len;
             }
             break;
 
             }
             break;
 
+        case TLV_IS_ALIAS_ID:
+           while (tmp >= NODE_ID_LEN+1) { /* is it worth attempting a decode ? */
+               ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
+               if (ext_is_len == 0) /* did something go wrong ? */
+                   goto trunctlv;
+               tmp-=ext_is_len;
+               tptr+=ext_is_len;
+           }
+           break;
+
         case TLV_EXT_IS_REACH:
         case TLV_EXT_IS_REACH:
-            printf("Extended IS Reachability (%u)",len);
-            tptr=pptr;
-            tmp=len;
-            while (tmp>0) {
-               printf("\n\t\t\tIS Neighbor: ");
-                isis_print_nodeid(tptr);
-                tptr+=(SYSTEM_ID_LEN+1);
-                printf(", Metric: %d",EXTRACT_24BITS(tptr));
-                tptr+=3;
-                tslen=*(tptr++);
-                printf(", %ssub-TLVs present",tslen ? "" : "no ");
-                if (tslen) {
-                    printf(" (%u)",tslen);
-                    ttslen=tslen;
-                    while (ttslen>0) {
-                        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 :
-                            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 :
-                            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++) {
-                                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:
-                            printf("Traffic Engineering Metric: %d", EXTRACT_24BITS(tptr));
-                            break;                            
-                        case SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR:
-                            printf("IPv4 interface address: %s", ipaddr_string(tptr));
-                            break;     
-                        case SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR:
-                            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);
+            while (tmp >= NODE_ID_LEN+3+1) { /* is it worth attempting a decode ? */
+                ext_is_len = isis_print_ext_is_reach(tptr,"\n\t      ",tlv_type);
+                if (ext_is_len == 0) /* did something go wrong ? */
+                    goto trunctlv;                   
+                tmp-=ext_is_len;
+                tptr+=ext_is_len;
             }
             break;
         case TLV_IS_REACH:
             }
             break;
         case TLV_IS_REACH:
-            printf("IS Reachability (%u)",len);
-           tlv_is_reach = (struct isis_tlv_is_reach *)pptr;
-           printf("\n\t\t\tIS Neighbor: ");
-            isis_print_nodeid(tlv_is_reach->neighbor_nodeid);
-
-           tmp = len;
+           if (!TTEST2(*tptr,1))  /* check if there is one byte left to read out the virtual flag */
+                goto trunctlv;
+            printf("\n\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)) {
             while (tmp >= sizeof(struct isis_tlv_is_reach)) {
-
-               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");
-
-               switch (tlv_is_reach->virtual_flag) {
-                   case 0:
-                       printf(", IsNotVirtual");
-                       break;
-                   case 1:
-                        printf(", IsVirtual");
-                        break;
-                    default:
-                        printf(", bogus virtual flag 0x%02x",tlv_is_reach->virtual_flag);
-                        break;     
-                   }
-
+               if (!TTEST(*tlv_is_reach))
+                   goto trunctlv;
+               printf("\n\t      IS Neighbor: %s",
+                      isis_print_id(tlv_is_reach->neighbor_nodeid, NODE_ID_LEN));
+                isis_print_metric_block(&tlv_is_reach->isis_metric_block);
                tmp -= sizeof(struct isis_tlv_is_reach);
                tlv_is_reach++;
            }
                tmp -= sizeof(struct isis_tlv_is_reach);
                tlv_is_reach++;
            }
-
- 
             break;
             break;
-       case TLV_IP_REACH:
-           printf("IP Internal reachability (%u)",len); 
-            isis_print_tlv_ip_reach(pptr, len);
+
+        case TLV_ESNEIGH:
+           tlv_es_reach = (const struct isis_tlv_es_reach *)tptr;
+            while (tmp >= sizeof(struct isis_tlv_es_reach)) {
+               if (!TTEST(*tlv_es_reach))
+                   goto trunctlv;
+               printf("\n\t      ES Neighbor: %s",
+                       isis_print_id(tlv_es_reach->neighbor_sysid,SYSTEM_ID_LEN));
+                isis_print_metric_block(&tlv_es_reach->isis_metric_block);
+               tmp -= sizeof(struct isis_tlv_es_reach);
+               tlv_es_reach++;
+           }
             break;
 
             break;
 
+            /* those two TLVs share the same format */
+       case TLV_IP_REACH:
        case TLV_IP_REACH_EXT:
        case TLV_IP_REACH_EXT:
-           printf("IP External reachability (%u)",len);
-               isis_print_tlv_ip_reach(pptr, len);
+           if (!isis_print_tlv_ip_reach(pptr, "\n\t      ", tlv_len))
+               return (1);
            break;
 
        case TLV_EXT_IP_REACH:
            break;
 
        case TLV_EXT_IP_REACH:
-           printf("Extended IP reachability (%u)",len);
-               i=len;
-               tptr=pptr;
-               
-               while (i>0) {
-                   memset (prefix, 0, 4);
-                       metric = EXTRACT_32BITS(tptr);
-                       tptr+=4;
-
-                       j=*(tptr);                                  
-                       bit_length = (*(tptr)++&0x3f);
-                       byte_length = (bit_length + 7) / 8;
-                       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 ");
-                       
-                       i-=(5+byte_length);
-                       tptr+=byte_length;
-               }
-               break;
+           while (tmp>0) {
+                ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV4);
+                if (ext_ip_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=ext_ip_len;
+               tmp-=ext_ip_len;
+           }
+           break;
 
 
-       case TLV_AUTH:
-           printf("Authentication (%u)",len);
-               if(*pptr==SUBTLV_AUTH_SIMPLE) {
-                 printf("\n\t\t\tsimple text password: ");
-                 for(i=1;i<len;i++) {
-                       printf("%c",*(pptr+i));
-                 }               
-               }
-               if(*pptr==SUBTLV_AUTH_MD5) {
-                 printf("\n\t\t\tMD5 password: ");
-                 for(i=1;i<len;i++) {
-                       printf("%02x",*(pptr+i));
-                 }               
-               }               
+        case TLV_MT_IP_REACH:
+           while (tmp>0) {
+                mt_len = isis_print_mtid(tptr, "\n\t      ");
+                if (mt_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=mt_len;
+                tmp-=mt_len;
+
+                ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV4);
+                if (ext_ip_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=ext_ip_len;
+               tmp-=ext_ip_len;
+           }
            break;
            break;
-       case TLV_PTP_ADJ:
-         printf("point-to-point Adjacency State (%u)",len);
-         tlv_ptp_adj = (struct isis_tlv_ptp_adj *)pptr;
-         i=len;
-           if(i>=1) {
-                 printf("\n\t\t\tAdjacency State: %s",
-                                isis_ptp_adjancey_values[*pptr].name);
-                 i--;
-               }
-           if(i>=4) {
-                 printf("\n\t\t\tExtended Local circuit ID: 0x%08x",
-                                EXTRACT_32BITS(tlv_ptp_adj->ext_local_circuit_id));
-                 i-=4;
-               }
-           if(i>=6) {
-                 printf("\n\t\t\tNeighbor SystemID: ");
-                                isis_print_sysid(tlv_ptp_adj->neighbor_sysid);
-                 i-=6;
+
+#ifdef INET6
+       case TLV_IP6_REACH:
+           while (tmp>0) {
+                ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV6);
+                if (ext_ip_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=ext_ip_len;
+               tmp-=ext_ip_len;
+           }
+           break;
+
+       case TLV_MT_IP6_REACH:
+           while (tmp>0) {
+                mt_len = isis_print_mtid(tptr, "\n\t      ");
+                if (mt_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=mt_len;
+                tmp-=mt_len;
+
+                ext_ip_len = isis_print_extd_ip_reach(tptr, "\n\t      ", IPV6);
+                if (ext_ip_len == 0) /* did something go wrong ? */
+                    goto trunctlv;
+                tptr+=ext_ip_len;
+               tmp-=ext_ip_len;
+           }
+           break;
+
+       case TLV_IP6ADDR:
+           while (tmp>0) {
+               if (!TTEST2(*tptr, 16))
+                   goto trunctlv;
+
+                printf("\n\t      IPv6 interface address: %s",
+                      ip6addr_string(tptr));
+
+               tptr += 16;
+               tmp -= 16;
+           }
+           break;
+#endif
+       case TLV_AUTH:
+           if (!TTEST2(*tptr, 1))
+               goto trunctlv;
+
+            printf("\n\t      %s: ",
+                   tok2str(isis_subtlv_auth_values,
+                           "unknown Authentication type 0x%02x",
+                           *tptr));
+
+           switch (*tptr) {
+           case SUBTLV_AUTH_SIMPLE:
+               for(i=1;i<tlv_len;i++) {
+                   if (!TTEST2(*(tptr+i), 1))
+                       goto trunctlv;
+                   printf("%c",*(tptr+i));
                }
                }
-           if(i>=4) {
-                 printf("\n\t\t\tNeighbor Extended Local circuit ID: 0x%08x",
-                                EXTRACT_32BITS(tlv_ptp_adj->neighbor_ext_local_circuit_id));
+               break;
+           case SUBTLV_AUTH_MD5:
+               for(i=1;i<tlv_len;i++) {
+                   if (!TTEST2(*(tptr+i), 1))
+                       goto trunctlv;
+                   printf("%02x",*(tptr+i));
                }
                }
+               if (tlv_len != SUBTLV_AUTH_MD5_LEN+1)
+                    printf(", (malformed subTLV) ");
+               break;
+           case SUBTLV_AUTH_PRIVATE:
+           default:
+               if(!print_unknown_data(tptr+1,"\n\t\t  ",tlv_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      Adjacency State: %s",
+                      tok2str(isis_ptp_adjancey_values, "0x%02x", *tptr));
+               tmp--;
+           }
+           if(tmp>sizeof(tlv_ptp_adj->extd_local_circuit_id)) {
+               if (!TTEST2(tlv_ptp_adj->extd_local_circuit_id,
+                            sizeof(tlv_ptp_adj->extd_local_circuit_id)))
+                   goto trunctlv;
+               printf("\n\t      Extended Local circuit ID: 0x%08x",
+                      EXTRACT_32BITS(tlv_ptp_adj->extd_local_circuit_id));
+               tmp-=sizeof(tlv_ptp_adj->extd_local_circuit_id);
+           }
+           if(tmp>=SYSTEM_ID_LEN) {
+               if (!TTEST2(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN))
+                   goto trunctlv;
+               printf("\n\t      Neighbor SystemID: %s",
+                      isis_print_id(tlv_ptp_adj->neighbor_sysid,SYSTEM_ID_LEN));
+               tmp-=SYSTEM_ID_LEN;
+           }
+           if(tmp>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) {
+               if (!TTEST2(tlv_ptp_adj->neighbor_extd_local_circuit_id,
+                            sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)))
+                   goto trunctlv;
+               printf("\n\t      Neighbor Extended Local circuit ID: 0x%08x",
+                      EXTRACT_32BITS(tlv_ptp_adj->neighbor_extd_local_circuit_id));
+           }
            break;
            break;
+
        case TLV_PROTOCOLS:
        case TLV_PROTOCOLS:
-           printf("Protocols supported (%u)", len);
-           printf("\n\t\t\tNLPID(s): ");
-           for(i=0;i<len;i++) {
-               j=0;
-               while(isis_nlpid_values[j].id) {
-               if (*(pptr+i) == isis_nlpid_values[j].id)
-                 break;
-               j++;
-               }
-               printf("%s (0x%02x)",isis_nlpid_values[j].name,*(pptr+i));          
-               if(i<len-1)
-               printf(", ");
+           printf("\n\t      NLPID(s): ");
+           while (tmp>0) {
+               if (!TTEST2(*(tptr), 1))
+                   goto trunctlv;
+               printf("%s",
+                       tok2str(osi_nlpid_values,
+                               "Unknown 0x%02x",
+                               *tptr++));
+               if (tmp>1) /* further NPLIDs ? - put comma */
+                   printf(", ");
+                tmp--;
            }
            break;
            }
            break;
+
        case TLV_TE_ROUTER_ID:
        case TLV_TE_ROUTER_ID:
-         printf("Traffic Engineering Router ID (%u)",len); 
-           printf("\n\t\t\tTraffic Engineering Router ID: %s", ipaddr_string(pptr));
+           if (!TTEST2(*pptr, 4))
+               goto trunctlv;
+           printf("\n\t      Traffic Engineering Router ID: %s", ipaddr_string(pptr));
            break;
            break;
+
        case TLV_IPADDR:
        case TLV_IPADDR:
-           printf("IP Interface address(es) (%u)",len); 
-           i=len;
-           while(i>0) {
-                 printf("\n\t\t\tIPv4 interface address: %s", ipaddr_string(pptr));
-                 i -=4;
-               }
+           while (tmp>0) {
+               if (!TTEST2(*tptr, 4))
+                   goto trunctlv;
+               printf("\n\t      IPv4 interface address: %s", ipaddr_string(tptr));
+               tptr += 4;
+               tmp -= 4;
+           }
            break;
 
        case TLV_HOSTNAME:
            break;
 
        case TLV_HOSTNAME:
-         printf("Hostname (%u)", len);
-         printf("\n\t\t\tHostname: ");
-         for(i=0;i<len;i++) {
-           printf("%c",*(pptr+i));
-         }
-         break;
-
-       case TLV_LSP:    
-         tlv_lsp = (struct isis_tlv_lsp *)pptr;
-           printf("LSP entries (%u)", len); 
-           i=0;
-               while(i<len) {
-                 printf("\n\t\t\tlsp-id: ");
-                 isis_print_nodeid(tlv_lsp->lsp_id);
-                 printf("-%02x",(tlv_lsp->lsp_id)[SYSTEM_ID_LEN+1]);
-                 printf("\n\t\t\t  sequence number: 0x%08x",EXTRACT_32BITS(tlv_lsp->sequence_number));
-                 printf("\n\t\t\t  Remaining lifetime: %5ds",EXTRACT_16BITS(tlv_lsp->remaining_lifetime));
-                 printf("\n\t\t\t  checksum: 0x%04x",EXTRACT_16BITS(tlv_lsp->checksum));
-                 i+=sizeof(struct isis_tlv_lsp);
-                 tlv_lsp++;
-               }
+           printf("\n\t      Hostname: ");
+           while (tmp>0) {
+               if (!TTEST2(*tptr, 1))
+                   goto trunctlv;
+               printf("%c",*tptr++);
+                tmp--;
+           }
+           break;
+
+       case TLV_SHARED_RISK_GROUP:
+           if (!TTEST2(*tptr, NODE_ID_LEN))
+                goto trunctlv;
+           printf("\n\t      IS Neighbor: %s", isis_print_id(tptr, NODE_ID_LEN));
+           tptr+=(NODE_ID_LEN);
+           tmp-=(NODE_ID_LEN);
+
+           if (!TTEST2(*tptr, 1))
+                goto trunctlv;
+           printf(", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(*tptr++) ? "numbered" : "unnumbered");
+           tmp--;
+
+           if (!TTEST2(*tptr,4))
+                goto trunctlv;
+           printf("\n\t      IPv4 interface address: %s", ipaddr_string(tptr));
+           tptr+=4;
+           tmp-=4;
+
+           if (!TTEST2(*tptr,4))
+                goto trunctlv;
+           printf("\n\t      IPv4 neighbor address: %s", ipaddr_string(tptr));
+           tptr+=4;
+           tmp-=4;
+
+           while (tmp>0) {
+                if (!TTEST2(*tptr, 4))
+                    goto trunctlv;
+                printf("\n\t      Link-ID: 0x%08x", EXTRACT_32BITS(tptr));
+                tptr+=4;
+                tmp-=4;
+           }
+           break;
+
+       case TLV_LSP:
+           tlv_lsp = (const struct isis_tlv_lsp *)tptr;
+           while(tmp>0) {
+               if (!TTEST((tlv_lsp->lsp_id)[LSP_ID_LEN]))
+                   goto trunctlv;
+               printf("\n\t      lsp-id: %s",
+                       isis_print_id(tlv_lsp->lsp_id, LSP_ID_LEN));
+               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:
            break;
 
        case TLV_CHECKSUM:
-         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)");
-               
+           if (!TTEST2(*tptr, 2))
+               goto trunctlv;
+           printf("\n\t      checksum: 0x%04x (%s)",
+                  EXTRACT_16BITS(tptr),
+                   (osi_cksum(optr, length)) ? "incorrect" : "correct");
            break;
 
        case TLV_MT_SUPPORTED:
            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 
+           while (tmp>1) {
+               /* length can only be a multiple of 2, otherwise there is
                   something broken -> so decode down until length is 1 */
                   something broken -> so decode down until length is 1 */
-               if (i!=1)
-                 {
-                       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");
-             }
-                       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;
+               if (tmp!=1) {
+                    mt_len = isis_print_mtid(tptr, "\n\t      ");
+                    if (mt_len == 0) /* did something go wrong ? */
+                        goto trunctlv;
+                    tptr+=mt_len;
+                    tmp-=mt_len;
+               } else {
+                   printf("\n\t      malformed MT-ID");
+                   break;
+               }
+           }
+           break;
+
+       case TLV_RESTART_SIGNALING:
+            if (!TTEST2(*tptr, 3))
+                goto trunctlv;
+            printf("\n\t      Flags [%s], Remaining holding time %us",
+                   bittok2str(isis_restart_flag_values, "none", *tptr),
+                   EXTRACT_16BITS(tptr+1));
+           tptr+=3;
+           break;
+
+        case TLV_IDRP_INFO:
+            if (!TTEST2(*tptr, 1))
+                goto trunctlv;
+            printf("\n\t      Inter-Domain Information Type: %s",
+                   tok2str(isis_subtlv_idrp_values,
+                           "Unknown (0x%02x)",
+                           *tptr));
+            switch (*tptr++) {
+            case SUBTLV_IDRP_ASN:
+                if (!TTEST2(*tptr, 2)) /* fetch AS number */
+                    goto trunctlv;
+                printf("AS Number: %u",EXTRACT_16BITS(tptr));
+                break;
+            case SUBTLV_IDRP_LOCAL:
+            case SUBTLV_IDRP_RES:
+            default:
+                if(!print_unknown_data(tptr,"\n\t      ",tlv_len-1))
+                    return(0);
+                break;
+            }
+            break;
+
+        case TLV_LSP_BUFFERSIZE:
+            if (!TTEST2(*tptr, 2))
+                goto trunctlv;
+            printf("\n\t      LSP Buffersize: %u",EXTRACT_16BITS(tptr));
+            break;
+
+        case TLV_PART_DIS:
+            while (tmp >= SYSTEM_ID_LEN) {
+                if (!TTEST2(*tptr, SYSTEM_ID_LEN))
+                    goto trunctlv;
+                printf("\n\t      %s",isis_print_id(tptr,SYSTEM_ID_LEN));
+                tptr+=SYSTEM_ID_LEN;
+                tmp-=SYSTEM_ID_LEN;
+            }
+            break;
+
+        case TLV_PREFIX_NEIGH:
+            if (!TTEST2(*tptr, sizeof(struct isis_metric_block)))
+                goto trunctlv;
+            printf("\n\t      Metric Block");
+            isis_print_metric_block((const struct isis_metric_block *)tptr);
+            tptr+=sizeof(struct isis_metric_block);
+            tmp-=sizeof(struct isis_metric_block);
+
+            while(tmp>0) {
+                if (!TTEST2(*tptr, 1))
+                    goto trunctlv;
+                prefix_len=*tptr++; /* read out prefix length in semioctets*/
+                tmp--;
+                if (!TTEST2(*tptr, prefix_len/2))
+                    goto trunctlv;
+                printf("\n\t\tAddress: %s/%u",
+                       print_nsap(tptr,prefix_len/2),
+                       prefix_len*4);
+                tptr+=prefix_len/2;
+                tmp-=prefix_len/2;
+            }
+            break;
+
+        case TLV_IIH_SEQNR:
+            if (!TTEST2(*tptr, 4)) /* check if four bytes are on the wire */
+                goto trunctlv;
+            printf("\n\t      Sequence number: %u", EXTRACT_32BITS(tptr) );
+            break;
+
+        case TLV_VENDOR_PRIVATE:
+            if (!TTEST2(*tptr, 3)) /* check if enough byte for a full oui */
+                goto trunctlv;
+            printf("\n\t      Vendor OUI Code: 0x%06x", EXTRACT_24BITS(tptr) );
+            tptr+=3;
+            tmp-=3;
+            if (tmp > 0) /* hexdump the rest */
+                if(!print_unknown_data(tptr,"\n\t\t",tmp))
+                    return(0);
+            break;
+            /*
+             * FIXME those are the defined TLVs that lack a decoder
+             * you are welcome to contribute code ;-)
+             */
+
+        case TLV_DECNET_PHASE4:
+        case TLV_LUCENT_PRIVATE:
+        case TLV_IPAUTH:
+        case TLV_NORTEL_PRIVATE1:
+        case TLV_NORTEL_PRIVATE2:
 
        default:
 
        default:
-           printf("unknown TLV, type %d, length %d", type, len);
+            if (vflag <= 1) {
+                if(!print_unknown_data(pptr,"\n\t\t",tlv_len))
+                    return(0);
+            }
            break;
        }
            break;
        }
+        /* do we want to see an additionally hexdump ? */
+        if (vflag> 1) {
+           if(!print_unknown_data(pptr,"\n\t      ",tlv_len))
+               return(0);
+        }
 
 
-       pptr += len;
-       packet_len -= len;
+       pptr += tlv_len;
+       packet_len -= tlv_len;
     }
 
     if (packet_len != 0) {
     }
 
     if (packet_len != 0) {
-       printf("\n\t\t\t %d straggler bytes", packet_len);
+       printf("\n\t      %u straggler bytes", packet_len);
     }
     }
+    return (1);
+
+ trunc:
+    fputs("[|isis]", stdout);
+    return (1);
+
+ trunctlv:
+    printf("\n\t\t packet exceeded snapshot");
     return(1);
 }
 
     return(1);
 }
 
@@ -1292,20 +2004,15 @@ static int isis_print (const u_char *p, u_int length)
  */
 
 static int
  */
 
 static int
-osi_cksum(register const u_char *p, register int len, u_char *off)
+osi_cksum(const u_int8_t *tptr, u_int len)
 {
        int32_t c0 = 0, c1 = 0;
 
 {
        int32_t c0 = 0, c1 = 0;
 
-       if ((off[0] == 0) && (off[1] == 0))
-               return 0;
-
-       off[0] = off[1] = 0;
        while ((int)--len >= 0) {
        while ((int)--len >= 0) {
-               c0 += *p++;
+               c0 += *tptr++;
                c0 %= 255;
                c1 += c0;
                c1 %= 255;
        }
        return (c0 | c1);
 }
                c0 %= 255;
                c1 += c0;
                c1 %= 255;
        }
        return (c0 | c1);
 }
-
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