/* * Copyright (c) 1992, 1993, 1994, 1995, 1996 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Original code by Matt Thomas, Digital Equipment Corporation * * Extensively modified by Hannes Gredler (hannes@gredler.at) for more * complete IS-IS & CLNP support. */ /* \summary: ISO CLNS, ESIS, and ISIS printer */ /* * specification: * * CLNP: ISO 8473 (respective ITU version is at https://www.itu.int/rec/T-REC-X.233/en/) * ES-IS: ISO 9542 * IS-IS: ISO 10589 */ #include #include "netdissect-stdinc.h" #include #include "netdissect.h" #include "addrtoname.h" #include "nlpid.h" #include "extract.h" #include "gmpls.h" #include "oui.h" #include "signature.h" /* * IS-IS is defined in ISO 10589. Look there for protocol definitions. */ #define SYSTEM_ID_LEN MAC_ADDR_LEN #define NODE_ID_LEN (SYSTEM_ID_LEN+1) #define LSP_ID_LEN (SYSTEM_ID_LEN+2) #define ISIS_VERSION 1 #define ESIS_VERSION 1 #define CLNP_VERSION 1 #define ISIS_PDU_TYPE_MASK 0x1F #define ESIS_PDU_TYPE_MASK 0x1F #define CLNP_PDU_TYPE_MASK 0x1F #define CLNP_FLAG_MASK 0xE0 #define ISIS_LAN_PRIORITY_MASK 0x7F #define ISIS_PDU_L1_LAN_IIH 15 #define ISIS_PDU_L2_LAN_IIH 16 #define ISIS_PDU_PTP_IIH 17 #define ISIS_PDU_L1_LSP 18 #define ISIS_PDU_L2_LSP 20 #define ISIS_PDU_L1_CSNP 24 #define ISIS_PDU_L2_CSNP 25 #define ISIS_PDU_L1_PSNP 26 #define ISIS_PDU_L2_PSNP 27 static const struct tok isis_pdu_values[] = { { ISIS_PDU_L1_LAN_IIH, "L1 Lan IIH"}, { ISIS_PDU_L2_LAN_IIH, "L2 Lan IIH"}, { ISIS_PDU_PTP_IIH, "p2p IIH"}, { ISIS_PDU_L1_LSP, "L1 LSP"}, { ISIS_PDU_L2_LSP, "L2 LSP"}, { ISIS_PDU_L1_CSNP, "L1 CSNP"}, { ISIS_PDU_L2_CSNP, "L2 CSNP"}, { ISIS_PDU_L1_PSNP, "L1 PSNP"}, { ISIS_PDU_L2_PSNP, "L2 PSNP"}, { 0, NULL} }; /* * A TLV is a tuple of a type, length and a value and is normally used for * encoding information in all sorts of places. This is an enumeration of * the well known types. * * list taken from rfc3359 plus some memory from veterans ;-) */ #define ISIS_TLV_AREA_ADDR 1 /* iso10589 */ #define ISIS_TLV_IS_REACH 2 /* iso10589 */ #define ISIS_TLV_ESNEIGH 3 /* iso10589 */ #define ISIS_TLV_PART_DIS 4 /* iso10589 */ #define ISIS_TLV_PREFIX_NEIGH 5 /* iso10589 */ #define ISIS_TLV_ISNEIGH 6 /* iso10589 */ #define ISIS_TLV_INSTANCE_ID 7 /* rfc8202 */ #define ISIS_TLV_PADDING 8 /* iso10589 */ #define ISIS_TLV_LSP 9 /* iso10589 */ #define ISIS_TLV_AUTH 10 /* iso10589, rfc3567 */ #define ISIS_TLV_CHECKSUM 12 /* rfc3358 */ #define ISIS_TLV_CHECKSUM_MINLEN 2 #define ISIS_TLV_POI 13 /* rfc6232 */ #define ISIS_TLV_LSP_BUFFERSIZE 14 /* iso10589 rev2 */ #define ISIS_TLV_EXT_IS_REACH 22 /* rfc5305 */ #define ISIS_TLV_IS_ALIAS_ID 24 /* rfc5311 */ #define ISIS_TLV_DECNET_PHASE4 42 #define ISIS_TLV_LUCENT_PRIVATE 66 #define ISIS_TLV_INT_IP_REACH 128 /* rfc1195, rfc2966 */ #define ISIS_TLV_PROTOCOLS 129 /* rfc1195 */ #define ISIS_TLV_EXT_IP_REACH 130 /* rfc1195, rfc2966 */ #define ISIS_TLV_IDRP_INFO 131 /* rfc1195 */ #define ISIS_TLV_IPADDR 132 /* rfc1195 */ #define ISIS_TLV_IPAUTH 133 /* rfc1195 */ #define ISIS_TLV_TE_ROUTER_ID 134 /* rfc5305 */ #define ISIS_TLV_EXTD_IP_REACH 135 /* rfc5305 */ #define ISIS_TLV_HOSTNAME 137 /* rfc2763 */ #define ISIS_TLV_SHARED_RISK_GROUP 138 /* draft-ietf-isis-gmpls-extensions */ #define ISIS_TLV_MT_PORT_CAP 143 /* rfc6165 */ #define ISIS_TLV_MT_CAPABILITY 144 /* rfc6329 */ #define ISIS_TLV_NORTEL_PRIVATE1 176 #define ISIS_TLV_NORTEL_PRIVATE2 177 #define ISIS_TLV_RESTART_SIGNALING 211 /* rfc3847 */ #define ISIS_TLV_RESTART_SIGNALING_FLAGLEN 1 #define ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN 2 #define ISIS_TLV_MT_IS_REACH 222 /* draft-ietf-isis-wg-multi-topology-05 */ #define ISIS_TLV_MT_SUPPORTED 229 /* draft-ietf-isis-wg-multi-topology-05 */ #define ISIS_TLV_IP6ADDR 232 /* draft-ietf-isis-ipv6-02 */ #define ISIS_TLV_MT_IP_REACH 235 /* draft-ietf-isis-wg-multi-topology-05 */ #define ISIS_TLV_IP6_REACH 236 /* draft-ietf-isis-ipv6-02 */ #define ISIS_TLV_MT_IP6_REACH 237 /* draft-ietf-isis-wg-multi-topology-05 */ #define ISIS_TLV_PTP_ADJ 240 /* rfc3373 */ #define ISIS_TLV_IIH_SEQNR 241 /* draft-shen-isis-iih-sequence-00 */ #define ISIS_TLV_ROUTER_CAPABILITY 242 /* rfc7981 */ #define ISIS_TLV_VENDOR_PRIVATE 250 /* draft-ietf-isis-experimental-tlv-01 */ #define ISIS_TLV_VENDOR_PRIVATE_MINLEN 3 static const struct tok isis_tlv_values[] = { { ISIS_TLV_AREA_ADDR, "Area address(es)"}, { ISIS_TLV_IS_REACH, "IS Reachability"}, { ISIS_TLV_ESNEIGH, "ES Neighbor(s)"}, { ISIS_TLV_PART_DIS, "Partition DIS"}, { ISIS_TLV_PREFIX_NEIGH, "Prefix Neighbors"}, { ISIS_TLV_ISNEIGH, "IS Neighbor(s)"}, { ISIS_TLV_INSTANCE_ID, "Instance Identifier"}, { ISIS_TLV_PADDING, "Padding"}, { ISIS_TLV_LSP, "LSP entries"}, { ISIS_TLV_AUTH, "Authentication"}, { ISIS_TLV_CHECKSUM, "Checksum"}, { ISIS_TLV_POI, "Purge Originator Identifier"}, { ISIS_TLV_LSP_BUFFERSIZE, "LSP Buffersize"}, { ISIS_TLV_EXT_IS_REACH, "Extended IS Reachability"}, { ISIS_TLV_IS_ALIAS_ID, "IS Alias ID"}, { ISIS_TLV_DECNET_PHASE4, "DECnet Phase IV"}, { ISIS_TLV_LUCENT_PRIVATE, "Lucent Proprietary"}, { ISIS_TLV_INT_IP_REACH, "IPv4 Internal Reachability"}, { ISIS_TLV_PROTOCOLS, "Protocols supported"}, { ISIS_TLV_EXT_IP_REACH, "IPv4 External Reachability"}, { ISIS_TLV_IDRP_INFO, "Inter-Domain Information Type"}, { ISIS_TLV_IPADDR, "IPv4 Interface address(es)"}, { ISIS_TLV_IPAUTH, "IPv4 authentication (deprecated)"}, { ISIS_TLV_TE_ROUTER_ID, "Traffic Engineering Router ID"}, { ISIS_TLV_EXTD_IP_REACH, "Extended IPv4 Reachability"}, { ISIS_TLV_SHARED_RISK_GROUP, "Shared Risk Link Group"}, { ISIS_TLV_MT_PORT_CAP, "Multi-Topology-Aware Port Capability"}, { ISIS_TLV_MT_CAPABILITY, "Multi-Topology Capability"}, { ISIS_TLV_NORTEL_PRIVATE1, "Nortel Proprietary"}, { ISIS_TLV_NORTEL_PRIVATE2, "Nortel Proprietary"}, { ISIS_TLV_HOSTNAME, "Hostname"}, { ISIS_TLV_RESTART_SIGNALING, "Restart Signaling"}, { ISIS_TLV_MT_IS_REACH, "Multi Topology IS Reachability"}, { ISIS_TLV_MT_SUPPORTED, "Multi Topology"}, { ISIS_TLV_IP6ADDR, "IPv6 Interface address(es)"}, { ISIS_TLV_MT_IP_REACH, "Multi-Topology IPv4 Reachability"}, { ISIS_TLV_IP6_REACH, "IPv6 reachability"}, { ISIS_TLV_MT_IP6_REACH, "Multi-Topology IP6 Reachability"}, { ISIS_TLV_PTP_ADJ, "Point-to-point Adjacency State"}, { ISIS_TLV_IIH_SEQNR, "Hello PDU Sequence Number"}, { ISIS_TLV_ROUTER_CAPABILITY, "IS-IS Router Capability"}, { ISIS_TLV_VENDOR_PRIVATE, "Vendor Private"}, { 0, NULL } }; #define ESIS_OPTION_PROTOCOLS 129 #define ESIS_OPTION_QOS_MAINTENANCE 195 /* iso9542 */ #define ESIS_OPTION_SECURITY 197 /* iso9542 */ #define ESIS_OPTION_ES_CONF_TIME 198 /* iso9542 */ #define ESIS_OPTION_PRIORITY 205 /* iso9542 */ #define ESIS_OPTION_ADDRESS_MASK 225 /* iso9542 */ #define ESIS_OPTION_SNPA_MASK 226 /* iso9542 */ static const struct tok esis_option_values[] = { { ESIS_OPTION_PROTOCOLS, "Protocols supported"}, { ESIS_OPTION_QOS_MAINTENANCE, "QoS Maintenance" }, { ESIS_OPTION_SECURITY, "Security" }, { ESIS_OPTION_ES_CONF_TIME, "ES Configuration Time" }, { ESIS_OPTION_PRIORITY, "Priority" }, { ESIS_OPTION_ADDRESS_MASK, "Address Mask" }, { ESIS_OPTION_SNPA_MASK, "SNPA Mask" }, { 0, NULL } }; #define CLNP_OPTION_DISCARD_REASON 193 #define CLNP_OPTION_QOS_MAINTENANCE 195 /* iso8473 */ #define CLNP_OPTION_SECURITY 197 /* iso8473 */ #define CLNP_OPTION_SOURCE_ROUTING 200 /* iso8473 */ #define CLNP_OPTION_ROUTE_RECORDING 203 /* iso8473 */ #define CLNP_OPTION_PADDING 204 /* iso8473 */ #define CLNP_OPTION_PRIORITY 205 /* iso8473 */ static const struct tok clnp_option_values[] = { { CLNP_OPTION_DISCARD_REASON, "Discard Reason"}, { CLNP_OPTION_PRIORITY, "Priority"}, { CLNP_OPTION_QOS_MAINTENANCE, "QoS Maintenance"}, { CLNP_OPTION_SECURITY, "Security"}, { CLNP_OPTION_SOURCE_ROUTING, "Source Routing"}, { CLNP_OPTION_ROUTE_RECORDING, "Route Recording"}, { CLNP_OPTION_PADDING, "Padding"}, { 0, NULL } }; static const struct tok clnp_option_rfd_class_values[] = { { 0x0, "General"}, { 0x8, "Address"}, { 0x9, "Source Routeing"}, { 0xa, "Lifetime"}, { 0xb, "PDU Discarded"}, { 0xc, "Reassembly"}, { 0, NULL } }; static const struct tok clnp_option_rfd_general_values[] = { { 0x0, "Reason not specified"}, { 0x1, "Protocol procedure error"}, { 0x2, "Incorrect checksum"}, { 0x3, "PDU discarded due to congestion"}, { 0x4, "Header syntax error (cannot be parsed)"}, { 0x5, "Segmentation needed but not permitted"}, { 0x6, "Incomplete PDU received"}, { 0x7, "Duplicate option"}, { 0, NULL } }; static const struct tok clnp_option_rfd_address_values[] = { { 0x0, "Destination address unreachable"}, { 0x1, "Destination address unknown"}, { 0, NULL } }; static const struct tok clnp_option_rfd_source_routeing_values[] = { { 0x0, "Unspecified source routeing error"}, { 0x1, "Syntax error in source routeing field"}, { 0x2, "Unknown address in source routeing field"}, { 0x3, "Path not acceptable"}, { 0, NULL } }; static const struct tok clnp_option_rfd_lifetime_values[] = { { 0x0, "Lifetime expired while data unit in transit"}, { 0x1, "Lifetime expired during reassembly"}, { 0, NULL } }; static const struct tok clnp_option_rfd_pdu_discard_values[] = { { 0x0, "Unsupported option not specified"}, { 0x1, "Unsupported protocol version"}, { 0x2, "Unsupported security option"}, { 0x3, "Unsupported source routeing option"}, { 0x4, "Unsupported recording of route option"}, { 0, NULL } }; static const struct tok clnp_option_rfd_reassembly_values[] = { { 0x0, "Reassembly interference"}, { 0, NULL } }; /* array of 16 error-classes */ static const struct tok *clnp_option_rfd_error_class[] = { clnp_option_rfd_general_values, NULL, NULL, NULL, NULL, NULL, NULL, NULL, clnp_option_rfd_address_values, clnp_option_rfd_source_routeing_values, clnp_option_rfd_lifetime_values, clnp_option_rfd_pdu_discard_values, clnp_option_rfd_reassembly_values, NULL, NULL, NULL }; #define CLNP_OPTION_OPTION_QOS_MASK 0x3f #define CLNP_OPTION_SCOPE_MASK 0xc0 #define CLNP_OPTION_SCOPE_SA_SPEC 0x40 #define CLNP_OPTION_SCOPE_DA_SPEC 0x80 #define CLNP_OPTION_SCOPE_GLOBAL 0xc0 static const struct tok clnp_option_scope_values[] = { { CLNP_OPTION_SCOPE_SA_SPEC, "Source Address Specific"}, { CLNP_OPTION_SCOPE_DA_SPEC, "Destination Address Specific"}, { CLNP_OPTION_SCOPE_GLOBAL, "Globally unique"}, { 0, NULL } }; static const struct tok clnp_option_sr_rr_values[] = { { 0x0, "partial"}, { 0x1, "complete"}, { 0, NULL } }; static const struct tok clnp_option_sr_rr_string_values[] = { { CLNP_OPTION_SOURCE_ROUTING, "source routing"}, { CLNP_OPTION_ROUTE_RECORDING, "recording of route in progress"}, { 0, NULL } }; static const struct tok clnp_option_qos_global_values[] = { { 0x20, "reserved"}, { 0x10, "sequencing vs. delay"}, { 0x08, "congested"}, { 0x04, "delay vs. cost"}, { 0x02, "error vs. delay"}, { 0x01, "error vs. cost"}, { 0, NULL } }; static const struct tok isis_tlv_router_capability_flags[] = { { 0x01, "S bit"}, { 0x02, "D bit"}, { 0, NULL } }; #define ISIS_SUBTLV_ROUTER_CAP_SR 2 /* rfc 8667 */ static const struct tok isis_router_capability_subtlv_values[] = { { ISIS_SUBTLV_ROUTER_CAP_SR, "SR-Capabilities"}, { 0, NULL } }; static const struct tok isis_router_capability_sr_flags[] = { { 0x80, "ipv4"}, { 0x40, "ipv6"}, { 0, NULL } }; #define ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP 3 /* rfc5305 */ #define ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID 4 /* rfc4205 */ #define ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID 5 /* rfc5305 */ #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR 6 /* rfc5305 */ #define ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR 8 /* rfc5305 */ #define ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW 9 /* rfc5305 */ #define ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW 10 /* rfc5305 */ #define ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW 11 /* rfc4124 */ #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD 12 /* draft-ietf-tewg-diff-te-proto-06 */ #define ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC 18 /* rfc5305 */ #define ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE 19 /* draft-ietf-isis-link-attr-01 */ #define ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE 20 /* rfc4205 */ #define ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR 21 /* rfc4205 */ #define ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS 22 /* rfc4124 */ #define ISIS_SUBTLV_EXT_IS_REACH_LAN_ADJ_SEGMENT_ID 32 /* rfc8667 */ #define ISIS_SUBTLV_SPB_METRIC 29 /* rfc6329 */ static const struct tok isis_ext_is_reach_subtlv_values[] = { { ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP, "Administrative groups" }, { ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID, "Link Local/Remote Identifier" }, { ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID, "Link Remote Identifier" }, { ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR, "IPv4 interface address" }, { ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR, "IPv4 neighbor address" }, { ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW, "Maximum link bandwidth" }, { ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW, "Reservable link bandwidth" }, { ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW, "Unreserved bandwidth" }, { ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC, "Traffic Engineering Metric" }, { ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE, "Link Attribute" }, { ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE, "Link Protection Type" }, { ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR, "Interface Switching Capability" }, { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD, "Bandwidth Constraints (old)" }, { ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS, "Bandwidth Constraints" }, { ISIS_SUBTLV_EXT_IS_REACH_LAN_ADJ_SEGMENT_ID, "LAN Adjacency Segment Identifier" }, { ISIS_SUBTLV_SPB_METRIC, "SPB Metric" }, { 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 ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32 1 /* draft-ietf-isis-admin-tags-01 */ #define ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64 2 /* draft-ietf-isis-admin-tags-01 */ #define ISIS_SUBTLV_EXTD_IP_REACH_PREFIX_SID 3 /* rfc8667 */ #define ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR 117 /* draft-ietf-isis-wg-multi-topology-05 */ static const struct tok isis_ext_ip_reach_subtlv_values[] = { { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32, "32-Bit Administrative tag" }, { ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64, "64-Bit Administrative tag" }, { ISIS_SUBTLV_EXTD_IP_REACH_PREFIX_SID, "Prefix SID" }, { ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR, "Management Prefix Color" }, { 0, NULL } }; #define ISIS_PREFIX_SID_FLAG_R 0x80 /* rfc 8667 */ #define ISIS_PREFIX_SID_FLAG_N 0x40 /* rfc 8667 */ #define ISIS_PREFIX_SID_FLAG_P 0x20 /* rfc 8667 */ #define ISIS_PREFIX_SID_FLAG_E 0x10 /* rfc 8667 */ #define ISIS_PREFIX_SID_FLAG_V 0x08 /* rfc 8667 */ #define ISIS_PREFIX_SID_FLAG_L 0x04 /* rfc 8667 */ static const struct tok prefix_sid_flag_values[] = { { ISIS_PREFIX_SID_FLAG_R, "Readvertisement"}, { ISIS_PREFIX_SID_FLAG_N, "Node"}, { ISIS_PREFIX_SID_FLAG_P, "No-PHP"}, { ISIS_PREFIX_SID_FLAG_E, "Explicit NULL"}, { ISIS_PREFIX_SID_FLAG_V, "Value"}, { ISIS_PREFIX_SID_FLAG_L, "Local"}, { 0, NULL} }; /* rfc 8667 */ static const struct tok prefix_sid_algo_values[] = { { 0, "SPF"}, { 1, "strict-SPF"}, { 0, NULL} }; static const struct tok isis_subtlv_link_attribute_values[] = { { 0x01, "Local Protection Available" }, { 0x02, "Link excluded from local protection path" }, { 0x04, "Local maintenance required"}, { 0, NULL } }; static const struct tok isis_lan_adj_sid_flag_values[] = { { 0x80, "Address family IPv6" }, { 0x40, "Backup" }, { 0x20, "Value" }, { 0x10, "Local significance" }, { 0x08, "Set of adjacencies" }, { 0x04, "Persistent" }, { 0, NULL } }; #define ISIS_SUBTLV_AUTH_SIMPLE 1 #define ISIS_SUBTLV_AUTH_GENERIC 3 /* rfc 5310 */ #define ISIS_SUBTLV_AUTH_MD5 54 #define ISIS_SUBTLV_AUTH_MD5_LEN 16 #define ISIS_SUBTLV_AUTH_PRIVATE 255 static const struct tok isis_subtlv_auth_values[] = { { ISIS_SUBTLV_AUTH_SIMPLE, "simple text password"}, { ISIS_SUBTLV_AUTH_GENERIC, "Generic Crypto key-id"}, { ISIS_SUBTLV_AUTH_MD5, "HMAC-MD5 password"}, { ISIS_SUBTLV_AUTH_PRIVATE, "Routing Domain private password"}, { 0, NULL } }; #define ISIS_SUBTLV_IDRP_RES 0 #define ISIS_SUBTLV_IDRP_LOCAL 1 #define ISIS_SUBTLV_IDRP_ASN 2 static const struct tok isis_subtlv_idrp_values[] = { { ISIS_SUBTLV_IDRP_RES, "Reserved"}, { ISIS_SUBTLV_IDRP_LOCAL, "Routing-Domain Specific"}, { ISIS_SUBTLV_IDRP_ASN, "AS Number Tag"}, { 0, NULL} }; #define ISIS_SUBTLV_SPB_MCID 4 #define ISIS_SUBTLV_SPB_DIGEST 5 #define ISIS_SUBTLV_SPB_BVID 6 #define ISIS_SUBTLV_SPB_INSTANCE 1 #define ISIS_SUBTLV_SPBM_SI 3 #define ISIS_SPB_MCID_LEN 51 #define ISIS_SUBTLV_SPB_MCID_MIN_LEN 102 #define ISIS_SUBTLV_SPB_DIGEST_MIN_LEN 33 #define ISIS_SUBTLV_SPB_BVID_MIN_LEN 6 #define ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN 19 #define ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN 8 static const struct tok isis_mt_port_cap_subtlv_values[] = { { ISIS_SUBTLV_SPB_MCID, "SPB MCID" }, { ISIS_SUBTLV_SPB_DIGEST, "SPB Digest" }, { ISIS_SUBTLV_SPB_BVID, "SPB BVID" }, { 0, NULL } }; static const struct tok isis_mt_capability_subtlv_values[] = { { ISIS_SUBTLV_SPB_INSTANCE, "SPB Instance" }, { ISIS_SUBTLV_SPBM_SI, "SPBM Service Identifier and Unicast Address" }, { 0, NULL } }; struct isis_spb_mcid { nd_uint8_t format_id; nd_byte name[32]; nd_uint16_t revision_lvl; nd_byte digest[16]; }; struct isis_subtlv_spb_mcid { struct isis_spb_mcid mcid; struct isis_spb_mcid aux_mcid; }; struct isis_subtlv_spb_instance { nd_byte cist_root_id[8]; nd_uint32_t cist_external_root_path_cost; nd_uint16_t bridge_priority; nd_uint32_t spsourceid; nd_uint8_t no_of_trees; }; #define CLNP_SEGMENT_PART 0x80 #define CLNP_MORE_SEGMENTS 0x40 #define CLNP_REQUEST_ER 0x20 static const struct tok clnp_flag_values[] = { { CLNP_SEGMENT_PART, "Segmentation permitted"}, { CLNP_MORE_SEGMENTS, "more Segments"}, { CLNP_REQUEST_ER, "request Error Report"}, { 0, NULL} }; #define ISIS_MASK_LSP_OL_BIT(x) (GET_U_1(x)&0x4) #define ISIS_MASK_LSP_ISTYPE_BITS(x) (GET_U_1(x)&0x3) #define ISIS_MASK_LSP_PARTITION_BIT(x) (GET_U_1(x)&0x80) #define ISIS_MASK_LSP_ATT_BITS(x) (GET_U_1(x)&0x78) #define ISIS_MASK_LSP_ATT_ERROR_BIT(x) (GET_U_1(x)&0x40) #define ISIS_MASK_LSP_ATT_EXPENSE_BIT(x) (GET_U_1(x)&0x20) #define ISIS_MASK_LSP_ATT_DELAY_BIT(x) (GET_U_1(x)&0x10) #define ISIS_MASK_LSP_ATT_DEFAULT_BIT(x) (GET_U_1(x)&0x8) #define ISIS_MASK_MTID(x) ((x)&0x0fff) #define ISIS_MASK_MTFLAGS(x) ((x)&0xf000) static const struct tok isis_mt_flag_values[] = { { 0x4000, "ATT bit set"}, { 0x8000, "Overload bit set"}, { 0, NULL} }; #define ISIS_MASK_TLV_EXTD_IP_UPDOWN(x) ((x)&0x80) #define ISIS_MASK_TLV_EXTD_IP_SUBTLV(x) ((x)&0x40) #define ISIS_MASK_TLV_EXTD_IP6_IE(x) ((x)&0x40) #define ISIS_MASK_TLV_EXTD_IP6_SUBTLV(x) ((x)&0x20) #define ISIS_LSP_TLV_METRIC_SUPPORTED(x) (GET_U_1(x)&0x80) #define ISIS_LSP_TLV_METRIC_IE(x) (GET_U_1(x)&0x40) #define ISIS_LSP_TLV_METRIC_UPDOWN(x) (GET_U_1(x)&0x80) #define ISIS_LSP_TLV_METRIC_VALUE(x) (GET_U_1(x)&0x3f) #define ISIS_MASK_TLV_SHARED_RISK_GROUP(x) ((x)&0x1) static const 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 const struct tok isis_iih_circuit_type_values[] = { { 1, "Level 1 only"}, { 2, "Level 2 only"}, { 3, "Level 1, Level 2"}, { 0, NULL} }; #define ISIS_LSP_TYPE_UNUSED0 0 #define ISIS_LSP_TYPE_LEVEL_1 1 #define ISIS_LSP_TYPE_UNUSED2 2 #define ISIS_LSP_TYPE_LEVEL_2 3 static const 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, "L2 IS"}, { 0, NULL } }; /* * Katz's point to point adjacency TLV uses codes to tell us the state of * the remote adjacency. Enumerate them. */ #define ISIS_PTP_ADJ_UP 0 #define ISIS_PTP_ADJ_INIT 1 #define ISIS_PTP_ADJ_DOWN 2 static const struct tok isis_ptp_adjacency_values[] = { { ISIS_PTP_ADJ_UP, "Up" }, { ISIS_PTP_ADJ_INIT, "Initializing" }, { ISIS_PTP_ADJ_DOWN, "Down" }, { 0, NULL} }; struct isis_tlv_ptp_adj { nd_uint8_t adjacency_state; nd_uint32_t extd_local_circuit_id; nd_byte neighbor_sysid[SYSTEM_ID_LEN]; nd_uint32_t neighbor_extd_local_circuit_id; }; static void osi_print_cksum(netdissect_options *, const uint8_t *pptr, uint16_t checksum, int checksum_offset, u_int length); static int clnp_print(netdissect_options *, const uint8_t *, u_int); static void esis_print(netdissect_options *, const uint8_t *, u_int); static int isis_print(netdissect_options *, const uint8_t *, u_int); struct isis_metric_block { nd_uint8_t metric_default; nd_uint8_t metric_delay; nd_uint8_t metric_expense; nd_uint8_t metric_error; }; struct isis_tlv_is_reach { struct isis_metric_block isis_metric_block; nd_byte neighbor_nodeid[NODE_ID_LEN]; }; struct isis_tlv_es_reach { struct isis_metric_block isis_metric_block; nd_byte neighbor_sysid[SYSTEM_ID_LEN]; }; struct isis_tlv_ip_reach { struct isis_metric_block isis_metric_block; nd_ipv4 prefix; nd_ipv4 mask; }; static const struct tok isis_is_reach_virtual_values[] = { { 0, "IsNotVirtual"}, { 1, "IsVirtual"}, { 0, NULL } }; static const struct tok isis_restart_flag_values[] = { { 0x1, "Restart Request"}, { 0x2, "Restart Acknowledgement"}, { 0x4, "Suppress adjacency advertisement"}, { 0, NULL } }; struct isis_common_header { nd_uint8_t nlpid; nd_uint8_t fixed_len; nd_uint8_t version; /* Protocol version */ nd_uint8_t id_length; nd_uint8_t pdu_type; /* 3 MSbits are reserved */ nd_uint8_t pdu_version; /* Packet format version */ nd_byte reserved; nd_uint8_t max_area; }; struct isis_iih_lan_header { nd_uint8_t circuit_type; nd_byte source_id[SYSTEM_ID_LEN]; nd_uint16_t holding_time; nd_uint16_t pdu_len; nd_uint8_t priority; nd_byte lan_id[NODE_ID_LEN]; }; struct isis_iih_ptp_header { nd_uint8_t circuit_type; nd_byte source_id[SYSTEM_ID_LEN]; nd_uint16_t holding_time; nd_uint16_t pdu_len; nd_uint8_t circuit_id; }; struct isis_lsp_header { nd_uint16_t pdu_len; nd_uint16_t remaining_lifetime; nd_byte lsp_id[LSP_ID_LEN]; nd_uint32_t sequence_number; nd_uint16_t checksum; nd_uint8_t typeblock; }; struct isis_csnp_header { nd_uint16_t pdu_len; nd_byte source_id[NODE_ID_LEN]; nd_byte start_lsp_id[LSP_ID_LEN]; nd_byte end_lsp_id[LSP_ID_LEN]; }; struct isis_psnp_header { nd_uint16_t pdu_len; nd_byte source_id[NODE_ID_LEN]; }; struct isis_tlv_lsp { nd_uint16_t remaining_lifetime; nd_byte lsp_id[LSP_ID_LEN]; nd_uint32_t sequence_number; nd_uint16_t checksum; }; #define ISIS_COMMON_HEADER_SIZE (sizeof(struct isis_common_header)) #define ISIS_IIH_LAN_HEADER_SIZE (sizeof(struct isis_iih_lan_header)) #define ISIS_IIH_PTP_HEADER_SIZE (sizeof(struct isis_iih_ptp_header)) #define ISIS_LSP_HEADER_SIZE (sizeof(struct isis_lsp_header)) #define ISIS_CSNP_HEADER_SIZE (sizeof(struct isis_csnp_header)) #define ISIS_PSNP_HEADER_SIZE (sizeof(struct isis_psnp_header)) void isoclns_print(netdissect_options *ndo, const u_char *p, u_int length) { ndo->ndo_protocol = "isoclns"; if (ndo->ndo_eflag) ND_PRINT("OSI NLPID %s (0x%02x): ", tok2str(nlpid_values, "Unknown", GET_U_1(p)), GET_U_1(p)); switch (GET_U_1(p)) { case NLPID_CLNP: if (!clnp_print(ndo, p, length)) print_unknown_data(ndo, p, "\n\t", length); break; case NLPID_ESIS: esis_print(ndo, p, length); return; case NLPID_ISIS: if (!isis_print(ndo, p, length)) print_unknown_data(ndo, p, "\n\t", length); break; case NLPID_NULLNS: ND_PRINT("%slength: %u", ndo->ndo_eflag ? "" : ", ", length); break; case NLPID_Q933: q933_print(ndo, p + 1, length - 1); break; case NLPID_IP: ip_print(ndo, p + 1, length - 1); break; case NLPID_IP6: ip6_print(ndo, p + 1, length - 1); break; case NLPID_PPP: ppp_print(ndo, p + 1, length - 1); break; default: if (!ndo->ndo_eflag) ND_PRINT("OSI NLPID 0x%02x unknown", GET_U_1(p)); ND_PRINT("%slength: %u", ndo->ndo_eflag ? "" : ", ", length); if (length > 1) print_unknown_data(ndo, p, "\n\t", length); break; } } #define CLNP_PDU_ER 1 #define CLNP_PDU_DT 28 #define CLNP_PDU_MD 29 #define CLNP_PDU_ERQ 30 #define CLNP_PDU_ERP 31 static const struct tok clnp_pdu_values[] = { { CLNP_PDU_ER, "Error Report"}, { CLNP_PDU_MD, "MD"}, { CLNP_PDU_DT, "Data"}, { CLNP_PDU_ERQ, "Echo Request"}, { CLNP_PDU_ERP, "Echo Response"}, { 0, NULL } }; struct clnp_header_t { nd_uint8_t nlpid; nd_uint8_t length_indicator; nd_uint8_t version; nd_uint8_t lifetime; /* units of 500ms */ nd_uint8_t type; nd_uint16_t segment_length; nd_uint16_t cksum; }; struct clnp_segment_header_t { nd_uint16_t data_unit_id; nd_uint16_t segment_offset; nd_uint16_t total_length; }; /* * clnp_print * Decode CLNP packets. Return 0 on error. */ static int clnp_print(netdissect_options *ndo, const uint8_t *pptr, u_int length) { const uint8_t *optr,*source_address,*dest_address; u_int li,li_remaining,tlen,nsap_offset,source_address_length,dest_address_length, clnp_pdu_type, clnp_flags; const struct clnp_header_t *clnp_header; const struct clnp_segment_header_t *clnp_segment_header; uint8_t rfd_error,rfd_error_major,rfd_error_minor; ndo->ndo_protocol = "clnp"; clnp_header = (const struct clnp_header_t *) pptr; ND_TCHECK_SIZE(clnp_header); li = GET_U_1(clnp_header->length_indicator); li_remaining = li; optr = pptr; if (!ndo->ndo_eflag) nd_print_protocol_caps(ndo); /* * Sanity checking of the header. */ if (GET_U_1(clnp_header->version) != CLNP_VERSION) { ND_PRINT("version %u packet not supported", GET_U_1(clnp_header->version)); return (0); } if (li > length) { ND_PRINT(" length indicator(%u) > PDU size (%u)!", li, length); return (0); } if (li < sizeof(struct clnp_header_t)) { ND_PRINT(" length indicator %u < min PDU size:", li); while (pptr < ndo->ndo_snapend) { ND_PRINT("%02X", GET_U_1(pptr)); pptr++; } return (0); } /* FIXME further header sanity checking */ clnp_pdu_type = GET_U_1(clnp_header->type) & CLNP_PDU_TYPE_MASK; clnp_flags = GET_U_1(clnp_header->type) & CLNP_FLAG_MASK; pptr += sizeof(struct clnp_header_t); li_remaining -= sizeof(struct clnp_header_t); if (li_remaining < 1) { ND_PRINT("li < size of fixed part of CLNP header and addresses"); return (0); } dest_address_length = GET_U_1(pptr); pptr += 1; li_remaining -= 1; if (li_remaining < dest_address_length) { ND_PRINT("li < size of fixed part of CLNP header and addresses"); return (0); } ND_TCHECK_LEN(pptr, dest_address_length); dest_address = pptr; pptr += dest_address_length; li_remaining -= dest_address_length; if (li_remaining < 1) { ND_PRINT("li < size of fixed part of CLNP header and addresses"); return (0); } source_address_length = GET_U_1(pptr); pptr += 1; li_remaining -= 1; if (li_remaining < source_address_length) { ND_PRINT("li < size of fixed part of CLNP header and addresses"); return (0); } ND_TCHECK_LEN(pptr, source_address_length); source_address = pptr; pptr += source_address_length; li_remaining -= source_address_length; if (ndo->ndo_vflag < 1) { ND_PRINT("%s%s > %s, %s, length %u", ndo->ndo_eflag ? "" : ", ", GET_ISONSAP_STRING(source_address, source_address_length), GET_ISONSAP_STRING(dest_address, dest_address_length), tok2str(clnp_pdu_values,"unknown (%u)",clnp_pdu_type), length); return (1); } ND_PRINT("%slength %u", ndo->ndo_eflag ? "" : ", ", length); ND_PRINT("\n\t%s PDU, hlen: %u, v: %u, lifetime: %u.%us, Segment PDU length: %u, checksum: 0x%04x", tok2str(clnp_pdu_values, "unknown (%u)",clnp_pdu_type), GET_U_1(clnp_header->length_indicator), GET_U_1(clnp_header->version), GET_U_1(clnp_header->lifetime)/2, (GET_U_1(clnp_header->lifetime)%2)*5, GET_BE_U_2(clnp_header->segment_length), GET_BE_U_2(clnp_header->cksum)); osi_print_cksum(ndo, optr, GET_BE_U_2(clnp_header->cksum), 7, GET_U_1(clnp_header->length_indicator)); ND_PRINT("\n\tFlags [%s]", bittok2str(clnp_flag_values, "none", clnp_flags)); ND_PRINT("\n\tsource address (length %u): %s\n\tdest address (length %u): %s", source_address_length, GET_ISONSAP_STRING(source_address, source_address_length), dest_address_length, GET_ISONSAP_STRING(dest_address, dest_address_length)); if (clnp_flags & CLNP_SEGMENT_PART) { if (li_remaining < sizeof(struct clnp_segment_header_t)) { ND_PRINT("li < size of fixed part of CLNP header, addresses, and segment part"); return (0); } clnp_segment_header = (const struct clnp_segment_header_t *) pptr; ND_TCHECK_SIZE(clnp_segment_header); ND_PRINT("\n\tData Unit ID: 0x%04x, Segment Offset: %u, Total PDU Length: %u", GET_BE_U_2(clnp_segment_header->data_unit_id), GET_BE_U_2(clnp_segment_header->segment_offset), GET_BE_U_2(clnp_segment_header->total_length)); pptr+=sizeof(struct clnp_segment_header_t); li_remaining-=sizeof(struct clnp_segment_header_t); } /* now walk the options */ while (li_remaining != 0) { u_int op, opli; const uint8_t *tptr; if (li_remaining < 2) { ND_PRINT(", bad opts/li"); return (0); } op = GET_U_1(pptr); opli = GET_U_1(pptr + 1); pptr += 2; li_remaining -= 2; if (opli > li_remaining) { ND_PRINT(", opt (%u) too long", op); return (0); } ND_TCHECK_LEN(pptr, opli); li_remaining -= opli; tptr = pptr; tlen = opli; ND_PRINT("\n\t %s Option #%u, length %u, value: ", tok2str(clnp_option_values,"Unknown",op), op, opli); /* * We've already checked that the entire option is present * in the captured packet with the ND_TCHECK_LEN() call. * Therefore, we don't need to do ND_TCHECK()/ND_TCHECK_LEN() * checks. * We do, however, need to check tlen, to make sure we * don't run past the end of the option. */ switch (op) { case CLNP_OPTION_ROUTE_RECORDING: /* those two options share the format */ case CLNP_OPTION_SOURCE_ROUTING: if (tlen < 2) { ND_PRINT(", bad opt len"); return (0); } ND_PRINT("%s %s", tok2str(clnp_option_sr_rr_values,"Unknown",GET_U_1(tptr)), tok2str(clnp_option_sr_rr_string_values, "Unknown Option %u", op)); nsap_offset=GET_U_1(tptr + 1); if (nsap_offset == 0) { ND_PRINT(" Bad NSAP offset (0)"); break; } nsap_offset-=1; /* offset to nsap list */ if (nsap_offset > tlen) { ND_PRINT(" Bad NSAP offset (past end of option)"); break; } tptr+=nsap_offset; tlen-=nsap_offset; while (tlen > 0) { source_address_length=GET_U_1(tptr); if (tlen < source_address_length+1) { ND_PRINT("\n\t NSAP address goes past end of option"); break; } if (source_address_length > 0) { source_address=(tptr+1); ND_PRINT("\n\t NSAP address (length %u): %s", source_address_length, GET_ISONSAP_STRING(source_address, source_address_length)); } tlen-=source_address_length+1; } break; case CLNP_OPTION_PRIORITY: if (tlen < 1) { ND_PRINT(", bad opt len"); return (0); } ND_PRINT("0x%1x", GET_U_1(tptr)&0x0f); break; case CLNP_OPTION_QOS_MAINTENANCE: if (tlen < 1) { ND_PRINT(", bad opt len"); return (0); } ND_PRINT("\n\t Format Code: %s", tok2str(clnp_option_scope_values, "Reserved", GET_U_1(tptr) & CLNP_OPTION_SCOPE_MASK)); if ((GET_U_1(tptr)&CLNP_OPTION_SCOPE_MASK) == CLNP_OPTION_SCOPE_GLOBAL) ND_PRINT("\n\t QoS Flags [%s]", bittok2str(clnp_option_qos_global_values, "none", GET_U_1(tptr)&CLNP_OPTION_OPTION_QOS_MASK)); break; case CLNP_OPTION_SECURITY: if (tlen < 2) { ND_PRINT(", bad opt len"); return (0); } ND_PRINT("\n\t Format Code: %s, Security-Level %u", tok2str(clnp_option_scope_values,"Reserved",GET_U_1(tptr)&CLNP_OPTION_SCOPE_MASK), GET_U_1(tptr + 1)); break; case CLNP_OPTION_DISCARD_REASON: if (tlen < 1) { ND_PRINT(", bad opt len"); return (0); } rfd_error = GET_U_1(tptr); rfd_error_major = (rfd_error&0xf0) >> 4; rfd_error_minor = rfd_error&0x0f; ND_PRINT("\n\t Class: %s Error (0x%01x), %s (0x%01x)", tok2str(clnp_option_rfd_class_values,"Unknown",rfd_error_major), rfd_error_major, tok2str(clnp_option_rfd_error_class[rfd_error_major],"Unknown",rfd_error_minor), rfd_error_minor); break; case CLNP_OPTION_PADDING: ND_PRINT("padding data"); break; /* * FIXME those are the defined Options that lack a decoder * you are welcome to contribute code ;-) */ default: print_unknown_data(ndo, tptr, "\n\t ", opli); break; } if (ndo->ndo_vflag > 1) print_unknown_data(ndo, pptr, "\n\t ", opli); pptr += opli; } switch (clnp_pdu_type) { case CLNP_PDU_ER: /* fall through */ case CLNP_PDU_ERP: if (GET_U_1(pptr) == NLPID_CLNP) { ND_PRINT("\n\t-----original packet-----\n\t"); /* FIXME recursion protection */ clnp_print(ndo, pptr, length - li); break; } /* The cases above break from the switch block if they see and print * a CLNP header in the Data part. For an Error Report PDU this is * described in Section 7.9.6 of ITU X.233 (1997 E), also known as * ISO/IEC 8473-1:1998(E). It is not clear why in this code the same * applies to an Echo Response PDU, as the standard does not specify * the contents -- could be a proprietary extension or a bug. In either * case, if the Data part does not contain a CLNP header, its structure * is considered unknown and the decoding falls through to print the * contents as-is. */ ND_FALL_THROUGH; case CLNP_PDU_DT: case CLNP_PDU_MD: case CLNP_PDU_ERQ: default: /* dump the PDU specific data */ if (length > ND_BYTES_BETWEEN(optr, pptr)) { ND_PRINT("\n\t undecoded non-header data, length %u", length-li); print_unknown_data(ndo, pptr, "\n\t ", length - ND_BYTES_BETWEEN(optr, pptr)); } } return (1); trunc: nd_print_trunc(ndo); return (1); } #define ESIS_PDU_REDIRECT 6 #define ESIS_PDU_ESH 2 #define ESIS_PDU_ISH 4 static const struct tok esis_pdu_values[] = { { ESIS_PDU_REDIRECT, "redirect"}, { ESIS_PDU_ESH, "ESH"}, { ESIS_PDU_ISH, "ISH"}, { 0, NULL } }; struct esis_header_t { nd_uint8_t nlpid; nd_uint8_t length_indicator; nd_uint8_t version; nd_byte reserved; nd_uint8_t type; nd_uint16_t holdtime; nd_uint16_t cksum; }; static void esis_print(netdissect_options *ndo, const uint8_t *pptr, u_int length) { const uint8_t *optr; u_int li, version, esis_pdu_type, source_address_length, source_address_number; const struct esis_header_t *esis_header; ndo->ndo_protocol = "esis"; if (!ndo->ndo_eflag) ND_PRINT("ES-IS"); if (length <= 2) { ND_PRINT(ndo->ndo_qflag ? "bad pkt!" : "no header at all!"); return; } esis_header = (const struct esis_header_t *) pptr; ND_TCHECK_SIZE(esis_header); li = GET_U_1(esis_header->length_indicator); optr = pptr; /* * Sanity checking of the header. */ if (GET_U_1(esis_header->nlpid) != NLPID_ESIS) { ND_PRINT(" nlpid 0x%02x packet not supported", GET_U_1(esis_header->nlpid)); return; } version = GET_U_1(esis_header->version); if (version != ESIS_VERSION) { ND_PRINT(" version %u packet not supported", version); return; } if (li > length) { ND_PRINT(" length indicator(%u) > PDU size (%u)!", li, length); return; } if (li < sizeof(struct esis_header_t) + 2) { ND_PRINT(" length indicator %u < min PDU size:", li); while (pptr < ndo->ndo_snapend) { ND_PRINT("%02X", GET_U_1(pptr)); pptr++; } return; } esis_pdu_type = GET_U_1(esis_header->type) & ESIS_PDU_TYPE_MASK; if (ndo->ndo_vflag < 1) { ND_PRINT("%s%s, length %u", ndo->ndo_eflag ? "" : ", ", tok2str(esis_pdu_values,"unknown type (%u)",esis_pdu_type), length); return; } else ND_PRINT("%slength %u\n\t%s (%u)", ndo->ndo_eflag ? "" : ", ", length, tok2str(esis_pdu_values,"unknown type: %u", esis_pdu_type), esis_pdu_type); ND_PRINT(", v: %u%s", version, version == ESIS_VERSION ? "" : "unsupported" ); ND_PRINT(", checksum: 0x%04x", GET_BE_U_2(esis_header->cksum)); osi_print_cksum(ndo, pptr, GET_BE_U_2(esis_header->cksum), 7, li); ND_PRINT(", holding time: %us, length indicator: %u", GET_BE_U_2(esis_header->holdtime), li); if (ndo->ndo_vflag > 1) print_unknown_data(ndo, optr, "\n\t", sizeof(struct esis_header_t)); pptr += sizeof(struct esis_header_t); li -= sizeof(struct esis_header_t); switch (esis_pdu_type) { case ESIS_PDU_REDIRECT: { const uint8_t *dst, *snpa, *neta; u_int dstl, snpal, netal; ND_TCHECK_1(pptr); if (li < 1) { ND_PRINT(", bad redirect/li"); return; } dstl = GET_U_1(pptr); pptr++; li--; ND_TCHECK_LEN(pptr, dstl); if (li < dstl) { ND_PRINT(", bad redirect/li"); return; } dst = pptr; pptr += dstl; li -= dstl; ND_PRINT("\n\t %s", GET_ISONSAP_STRING(dst, dstl)); ND_TCHECK_1(pptr); if (li < 1) { ND_PRINT(", bad redirect/li"); return; } snpal = GET_U_1(pptr); pptr++; li--; ND_TCHECK_LEN(pptr, snpal); if (li < snpal) { ND_PRINT(", bad redirect/li"); return; } snpa = pptr; pptr += snpal; li -= snpal; ND_TCHECK_1(pptr); if (li < 1) { ND_PRINT(", bad redirect/li"); return; } netal = GET_U_1(pptr); pptr++; ND_TCHECK_LEN(pptr, netal); if (li < netal) { ND_PRINT(", bad redirect/li"); return; } neta = pptr; pptr += netal; li -= netal; if (snpal == MAC_ADDR_LEN) ND_PRINT("\n\t SNPA (length: %u): %s", snpal, GET_ETHERADDR_STRING(snpa)); else ND_PRINT("\n\t SNPA (length: %u): %s", snpal, GET_LINKADDR_STRING(snpa, LINKADDR_OTHER, snpal)); if (netal != 0) ND_PRINT("\n\t NET (length: %u) %s", netal, GET_ISONSAP_STRING(neta, netal)); break; } case ESIS_PDU_ESH: ND_TCHECK_1(pptr); if (li < 1) { ND_PRINT(", bad esh/li"); return; } source_address_number = GET_U_1(pptr); pptr++; li--; ND_PRINT("\n\t Number of Source Addresses: %u", source_address_number); while (source_address_number > 0) { ND_TCHECK_1(pptr); if (li < 1) { ND_PRINT(", bad esh/li"); return; } source_address_length = GET_U_1(pptr); pptr++; li--; ND_TCHECK_LEN(pptr, source_address_length); if (li < source_address_length) { ND_PRINT(", bad esh/li"); return; } ND_PRINT("\n\t NET (length: %u): %s", source_address_length, GET_ISONSAP_STRING(pptr, source_address_length)); pptr += source_address_length; li -= source_address_length; source_address_number--; } break; case ESIS_PDU_ISH: { ND_TCHECK_1(pptr); if (li < 1) { ND_PRINT(", bad ish/li"); return; } source_address_length = GET_U_1(pptr); pptr++; li--; ND_TCHECK_LEN(pptr, source_address_length); if (li < source_address_length) { ND_PRINT(", bad ish/li"); return; } ND_PRINT("\n\t NET (length: %u): %s", source_address_length, GET_ISONSAP_STRING(pptr, source_address_length)); pptr += source_address_length; li -= source_address_length; break; } default: if (ndo->ndo_vflag <= 1) { /* * If there's at least one byte to print, print * it/them. */ if (ND_TTEST_LEN(pptr, 1)) print_unknown_data(ndo, pptr, "\n\t ", ND_BYTES_AVAILABLE_AFTER(pptr)); } return; } /* now walk the options */ while (li != 0) { u_int op, opli; const uint8_t *tptr; if (li < 2) { ND_PRINT(", bad opts/li"); return; } op = GET_U_1(pptr); opli = GET_U_1(pptr + 1); pptr += 2; li -= 2; if (opli > li) { ND_PRINT(", opt (%u) too long", op); return; } li -= opli; tptr = pptr; ND_PRINT("\n\t %s Option #%u, length %u, value: ", tok2str(esis_option_values,"Unknown",op), op, opli); switch (op) { case ESIS_OPTION_ES_CONF_TIME: if (opli == 2) { ND_TCHECK_2(pptr); ND_PRINT("%us", GET_BE_U_2(tptr)); } else ND_PRINT("(bad length)"); break; case ESIS_OPTION_PROTOCOLS: while (opli>0) { ND_PRINT("%s (0x%02x)", tok2str(nlpid_values, "unknown", GET_U_1(tptr)), GET_U_1(tptr)); if (opli>1) /* further NPLIDs ? - put comma */ ND_PRINT(", "); tptr++; opli--; } break; /* * FIXME those are the defined Options that lack a decoder * you are welcome to contribute code ;-) */ case ESIS_OPTION_QOS_MAINTENANCE: case ESIS_OPTION_SECURITY: case ESIS_OPTION_PRIORITY: case ESIS_OPTION_ADDRESS_MASK: case ESIS_OPTION_SNPA_MASK: default: print_unknown_data(ndo, tptr, "\n\t ", opli); break; } if (ndo->ndo_vflag > 1) print_unknown_data(ndo, pptr, "\n\t ", opli); pptr += opli; } return; trunc: nd_print_trunc(ndo); } static void isis_print_mcid(netdissect_options *ndo, const struct isis_spb_mcid *mcid) { int i; ND_TCHECK_SIZE(mcid); ND_PRINT("ID: %u, Name: ", GET_U_1(mcid->format_id)); nd_printjnp(ndo, mcid->name, sizeof(mcid->name)); ND_PRINT("\n\t Lvl: %u", GET_BE_U_2(mcid->revision_lvl)); ND_PRINT(", Digest: "); for(i=0;i<16;i++) ND_PRINT("%.2x ", mcid->digest[i]); return; trunc: nd_print_trunc(ndo); } static int isis_print_mt_port_cap_subtlv(netdissect_options *ndo, const uint8_t *tptr, u_int len) { u_int stlv_type, stlv_len; const struct isis_subtlv_spb_mcid *subtlv_spb_mcid; int i; while (len > 2) { stlv_type = GET_U_1(tptr); stlv_len = GET_U_1(tptr + 1); /* first lets see if we know the subTLVs name*/ ND_PRINT("\n\t %s subTLV #%u, length: %u", tok2str(isis_mt_port_cap_subtlv_values, "unknown", stlv_type), stlv_type, stlv_len); tptr += 2; /*len -= TLV_TYPE_LEN_OFFSET;*/ len -= 2; /* Make sure the subTLV fits within the space left */ if (len < stlv_len) goto subtlv_too_long; /* Make sure the entire subTLV is in the captured data */ ND_TCHECK_LEN(tptr, stlv_len); switch (stlv_type) { case ISIS_SUBTLV_SPB_MCID: { if (stlv_len < ISIS_SUBTLV_SPB_MCID_MIN_LEN) goto subtlv_too_short; subtlv_spb_mcid = (const struct isis_subtlv_spb_mcid *)tptr; ND_PRINT("\n\t MCID: "); isis_print_mcid(ndo, &(subtlv_spb_mcid->mcid)); /*tptr += SPB_MCID_MIN_LEN; len -= SPB_MCID_MIN_LEN; */ ND_PRINT("\n\t AUX-MCID: "); isis_print_mcid(ndo, &(subtlv_spb_mcid->aux_mcid)); /*tptr += SPB_MCID_MIN_LEN; len -= SPB_MCID_MIN_LEN; */ tptr += ISIS_SUBTLV_SPB_MCID_MIN_LEN; len -= ISIS_SUBTLV_SPB_MCID_MIN_LEN; stlv_len -= ISIS_SUBTLV_SPB_MCID_MIN_LEN; break; } case ISIS_SUBTLV_SPB_DIGEST: { if (stlv_len < ISIS_SUBTLV_SPB_DIGEST_MIN_LEN) goto subtlv_too_short; ND_PRINT("\n\t RES: %u V: %u A: %u D: %u", (GET_U_1(tptr) >> 5), ((GET_U_1(tptr) >> 4) & 0x01), ((GET_U_1(tptr) >> 2) & 0x03), (GET_U_1(tptr) & 0x03)); tptr++; ND_PRINT("\n\t Digest: "); for(i=1;i<=8; i++) { ND_PRINT("%08x ", GET_BE_U_4(tptr)); if (i%4 == 0 && i != 8) ND_PRINT("\n\t "); tptr += 4; } len -= ISIS_SUBTLV_SPB_DIGEST_MIN_LEN; stlv_len -= ISIS_SUBTLV_SPB_DIGEST_MIN_LEN; break; } case ISIS_SUBTLV_SPB_BVID: { while (stlv_len != 0) { if (stlv_len < 4) goto subtlv_too_short; ND_PRINT("\n\t ECT: %08x", GET_BE_U_4(tptr)); tptr += 4; len -= 4; stlv_len -= 4; if (stlv_len < 2) goto subtlv_too_short; ND_PRINT(" BVID: %u, U:%01x M:%01x ", (GET_BE_U_2(tptr) >> 4) , (GET_BE_U_2(tptr) >> 3) & 0x01, (GET_BE_U_2(tptr) >> 2) & 0x01); tptr += 2; len -= 2; stlv_len -= 2; } break; } default: break; } tptr += stlv_len; len -= stlv_len; } return (0); trunc: nd_print_trunc(ndo); return (1); subtlv_too_long: ND_PRINT(" (> containing TLV length)"); return (1); subtlv_too_short: ND_PRINT(" (too short)"); return (1); } static int isis_print_mt_capability_subtlv(netdissect_options *ndo, const uint8_t *tptr, u_int len) { u_int stlv_type, stlv_len, treecount; while (len > 2) { stlv_type = GET_U_1(tptr); stlv_len = GET_U_1(tptr + 1); tptr += 2; len -= 2; /* first lets see if we know the subTLVs name*/ ND_PRINT("\n\t %s subTLV #%u, length: %u", tok2str(isis_mt_capability_subtlv_values, "unknown", stlv_type), stlv_type, stlv_len); /* Make sure the subTLV fits within the space left */ if (len < stlv_len) goto subtlv_too_long; /* Make sure the entire subTLV is in the captured data */ ND_TCHECK_LEN(tptr, stlv_len); switch (stlv_type) { case ISIS_SUBTLV_SPB_INSTANCE: if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN) goto subtlv_too_short; ND_PRINT("\n\t CIST Root-ID: %08x", GET_BE_U_4(tptr)); tptr += 4; ND_PRINT(" %08x", GET_BE_U_4(tptr)); tptr += 4; ND_PRINT(", Path Cost: %08x", GET_BE_U_4(tptr)); tptr += 4; ND_PRINT(", Prio: %u", GET_BE_U_2(tptr)); tptr += 2; ND_PRINT("\n\t RES: %u", GET_BE_U_2(tptr) >> 5); ND_PRINT(", V: %u", (GET_BE_U_2(tptr) >> 4) & 0x0001); ND_PRINT(", SPSource-ID: %u", (GET_BE_U_4(tptr) & 0x000fffff)); tptr += 4; ND_PRINT(", No of Trees: %x", GET_U_1(tptr)); treecount = GET_U_1(tptr); tptr++; len -= ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN; stlv_len -= ISIS_SUBTLV_SPB_INSTANCE_MIN_LEN; while (treecount) { if (stlv_len < ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN) goto trunc; ND_PRINT("\n\t U:%u, M:%u, A:%u, RES:%u", GET_U_1(tptr) >> 7, (GET_U_1(tptr) >> 6) & 0x01, (GET_U_1(tptr) >> 5) & 0x01, (GET_U_1(tptr) & 0x1f)); tptr++; ND_PRINT(", ECT: %08x", GET_BE_U_4(tptr)); tptr += 4; ND_PRINT(", BVID: %u, SPVID: %u", (GET_BE_U_3(tptr) >> 12) & 0x000fff, GET_BE_U_3(tptr) & 0x000fff); tptr += 3; len -= ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN; stlv_len -= ISIS_SUBTLV_SPB_INSTANCE_VLAN_TUPLE_LEN; treecount--; } break; case ISIS_SUBTLV_SPBM_SI: if (stlv_len < 8) goto trunc; ND_PRINT("\n\t BMAC: %08x", GET_BE_U_4(tptr)); tptr += 4; ND_PRINT("%04x", GET_BE_U_2(tptr)); tptr += 2; ND_PRINT(", RES: %u, VID: %u", GET_BE_U_2(tptr) >> 12, (GET_BE_U_2(tptr)) & 0x0fff); tptr += 2; len -= 8; stlv_len -= 8; while (stlv_len >= 4) { ND_PRINT("\n\t T: %u, R: %u, RES: %u, ISID: %u", (GET_BE_U_4(tptr) >> 31), (GET_BE_U_4(tptr) >> 30) & 0x01, (GET_BE_U_4(tptr) >> 24) & 0x03f, (GET_BE_U_4(tptr)) & 0x0ffffff); tptr += 4; len -= 4; stlv_len -= 4; } break; default: break; } tptr += stlv_len; len -= stlv_len; } return (0); trunc: nd_print_trunc(ndo); return (1); subtlv_too_long: ND_PRINT(" (> containing TLV length)"); return (1); subtlv_too_short: ND_PRINT(" (too short)"); return (1); } /* shared routine for printing system, node and lsp-ids */ static char * isis_print_id(netdissect_options *ndo, const uint8_t *cp, u_int id_len) { u_int i; static char id[sizeof("xxxx.xxxx.xxxx.yy-zz")]; char *pos = id; u_int sysid_len; sysid_len = SYSTEM_ID_LEN; if (sysid_len > id_len) sysid_len = id_len; for (i = 1; i <= sysid_len; i++) { snprintf(pos, sizeof(id) - (pos - id), "%02x", GET_U_1(cp)); cp++; pos += strlen(pos); if (i == 2 || i == 4) *pos++ = '.'; } if (id_len >= NODE_ID_LEN) { snprintf(pos, sizeof(id) - (pos - id), ".%02x", GET_U_1(cp)); cp++; pos += strlen(pos); } if (id_len == LSP_ID_LEN) snprintf(pos, sizeof(id) - (pos - id), "-%02x", GET_U_1(cp)); return (id); } /* print the 4-byte metric block which is common found in the old-style TLVs */ static int isis_print_metric_block(netdissect_options *ndo, const struct isis_metric_block *isis_metric_block) { ND_PRINT(", Default Metric: %u, %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)) ND_PRINT("\n\t\t Delay Metric: %u, %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)) ND_PRINT("\n\t\t Expense Metric: %u, %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)) ND_PRINT("\n\t\t Error Metric: %u, %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 int isis_print_tlv_ip_reach(netdissect_options *ndo, const uint8_t *cp, const char *ident, u_int length) { 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)) { ND_PRINT("short IPv4 Reachability (%u vs %zu)", length, sizeof(*tlv_ip_reach)); return (0); } ND_TCHECK_SIZE(tlv_ip_reach); prefix_len = mask2plen(GET_IPV4_TO_HOST_ORDER(tlv_ip_reach->mask)); if (prefix_len == -1) ND_PRINT("%sIPv4 prefix: %s mask %s", ident, GET_IPADDR_STRING(tlv_ip_reach->prefix), GET_IPADDR_STRING(tlv_ip_reach->mask)); else ND_PRINT("%sIPv4 prefix: %15s/%u", ident, GET_IPADDR_STRING(tlv_ip_reach->prefix), prefix_len); ND_PRINT(", 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)) ND_PRINT("%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)) ND_PRINT("%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)) ND_PRINT("%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); trunc: return 0; } /* * 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(netdissect_options *ndo, const uint8_t *tptr, u_int subt, u_int subl, const char *ident) { /* first lets see if we know the subTLVs name*/ ND_PRINT("%s%s subTLV #%u, length: %u", ident, tok2str(isis_ext_ip_reach_subtlv_values, "unknown", subt), subt, subl); ND_TCHECK_LEN(tptr, subl); switch(subt) { case ISIS_SUBTLV_EXTD_IP_REACH_MGMT_PREFIX_COLOR: /* fall through */ case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG32: while (subl >= 4) { ND_PRINT(", 0x%08x (=%u)", GET_BE_U_4(tptr), GET_BE_U_4(tptr)); tptr+=4; subl-=4; } break; case ISIS_SUBTLV_EXTD_IP_REACH_ADMIN_TAG64: while (subl >= 8) { ND_PRINT(", 0x%08x%08x", GET_BE_U_4(tptr), GET_BE_U_4(tptr + 4)); tptr+=8; subl-=8; } break; case ISIS_SUBTLV_EXTD_IP_REACH_PREFIX_SID: { uint8_t algo, flags; uint32_t sid; flags = GET_U_1(tptr); algo = GET_U_1(tptr+1); if (flags & ISIS_PREFIX_SID_FLAG_V) { if (subl < 5) goto trunc; sid = GET_BE_U_3(tptr+2); tptr+=5; subl-=5; } else { if (subl < 6) goto trunc; sid = GET_BE_U_4(tptr+2); tptr+=6; subl-=6; } ND_PRINT(", Flags [%s], Algo %s (%u), %s %u", bittok2str(prefix_sid_flag_values, "None", flags), tok2str(prefix_sid_algo_values, "Unknown", algo), algo, flags & ISIS_PREFIX_SID_FLAG_V ? "label" : "index", sid); } break; default: if (!print_unknown_data(ndo, tptr, "\n\t\t ", subl)) return(0); break; } return(1); trunc: nd_print_trunc(ndo); return(0); } /* * 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(netdissect_options *ndo, const uint8_t *tptr, const char *ident, u_int tlv_type, u_int tlv_remaining) { char ident_buffer[20]; u_int subtlv_type,subtlv_len,subtlv_sum_len; int proc_bytes = 0; /* how many bytes did we process ? */ u_int te_class,priority_level,gmpls_switch_cap; union { /* int to float conversion buffer for several subTLVs */ float f; uint32_t i; } bw; ND_TCHECK_LEN(tptr, NODE_ID_LEN); if (tlv_remaining < NODE_ID_LEN) return(0); ND_PRINT("%sIS Neighbor: %s", ident, isis_print_id(ndo, tptr, NODE_ID_LEN)); tptr+=NODE_ID_LEN; tlv_remaining-=NODE_ID_LEN; proc_bytes+=NODE_ID_LEN; if (tlv_type != ISIS_TLV_IS_ALIAS_ID) { /* the Alias TLV Metric field is implicit 0 */ ND_TCHECK_3(tptr); if (tlv_remaining < 3) return(0); ND_PRINT(", Metric: %u", GET_BE_U_3(tptr)); tptr+=3; tlv_remaining-=3; proc_bytes+=3; } ND_TCHECK_1(tptr); if (tlv_remaining < 1) return(0); subtlv_sum_len=GET_U_1(tptr); /* read out subTLV length */ tptr++; tlv_remaining--; proc_bytes++; ND_PRINT(", %ssub-TLVs present",subtlv_sum_len ? "" : "no "); if (subtlv_sum_len) { ND_PRINT(" (%u)", subtlv_sum_len); /* prepend the indent string */ snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident); ident = ident_buffer; while (subtlv_sum_len != 0) { ND_TCHECK_2(tptr); if (tlv_remaining < 2) { ND_PRINT("%sRemaining data in TLV shorter than a subTLV header",ident); proc_bytes += tlv_remaining; break; } if (subtlv_sum_len < 2) { ND_PRINT("%sRemaining data in subTLVs shorter than a subTLV header",ident); proc_bytes += subtlv_sum_len; break; } subtlv_type=GET_U_1(tptr); subtlv_len=GET_U_1(tptr + 1); tptr += 2; tlv_remaining -= 2; subtlv_sum_len -= 2; proc_bytes += 2; ND_PRINT("%s%s subTLV #%u, length: %u", ident, tok2str(isis_ext_is_reach_subtlv_values, "unknown", subtlv_type), subtlv_type, subtlv_len); if (subtlv_sum_len < subtlv_len) { ND_PRINT(" (remaining data in subTLVs shorter than the current subTLV)"); proc_bytes += subtlv_sum_len; break; } if (tlv_remaining < subtlv_len) { ND_PRINT(" (> remaining tlv length)"); proc_bytes += tlv_remaining; break; } ND_TCHECK_LEN(tptr, subtlv_len); switch(subtlv_type) { case ISIS_SUBTLV_EXT_IS_REACH_ADMIN_GROUP: case ISIS_SUBTLV_EXT_IS_REACH_LINK_LOCAL_REMOTE_ID: case ISIS_SUBTLV_EXT_IS_REACH_LINK_REMOTE_ID: if (subtlv_len >= 4) { ND_PRINT(", 0x%08x", GET_BE_U_4(tptr)); if (subtlv_len == 8) /* rfc4205 */ ND_PRINT(", 0x%08x", GET_BE_U_4(tptr + 4)); } break; case ISIS_SUBTLV_EXT_IS_REACH_IPV4_INTF_ADDR: case ISIS_SUBTLV_EXT_IS_REACH_IPV4_NEIGHBOR_ADDR: if (subtlv_len >= sizeof(nd_ipv4)) ND_PRINT(", %s", GET_IPADDR_STRING(tptr)); break; case ISIS_SUBTLV_EXT_IS_REACH_MAX_LINK_BW : case ISIS_SUBTLV_EXT_IS_REACH_RESERVABLE_BW: if (subtlv_len >= 4) { bw.i = GET_BE_U_4(tptr); ND_PRINT(", %.3f Mbps", bw.f * 8 / 1000000); } break; case ISIS_SUBTLV_EXT_IS_REACH_UNRESERVED_BW : if (subtlv_len >= 32) { for (te_class = 0; te_class < 8; te_class++) { bw.i = GET_BE_U_4(tptr); ND_PRINT("%s TE-Class %u: %.3f Mbps", ident, te_class, bw.f * 8 / 1000000); tptr += 4; subtlv_len -= 4; subtlv_sum_len -= 4; proc_bytes += 4; } } break; case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS: /* fall through */ case ISIS_SUBTLV_EXT_IS_REACH_BW_CONSTRAINTS_OLD: if (subtlv_len == 0) break; ND_PRINT("%sBandwidth Constraints Model ID: %s (%u)", ident, tok2str(diffserv_te_bc_values, "unknown", GET_U_1(tptr)), GET_U_1(tptr)); tptr++; subtlv_len--; subtlv_sum_len--; proc_bytes++; /* decode BCs until the subTLV ends */ for (te_class = 0; subtlv_len != 0; te_class++) { if (subtlv_len < 4) break; bw.i = GET_BE_U_4(tptr); ND_PRINT("%s Bandwidth constraint CT%u: %.3f Mbps", ident, te_class, bw.f * 8 / 1000000); tptr += 4; subtlv_len -= 4; subtlv_sum_len -= 4; proc_bytes += 4; } break; case ISIS_SUBTLV_EXT_IS_REACH_TE_METRIC: if (subtlv_len >= 3) ND_PRINT(", %u", GET_BE_U_3(tptr)); break; case ISIS_SUBTLV_EXT_IS_REACH_LINK_ATTRIBUTE: if (subtlv_len == 2) { ND_PRINT(", [ %s ] (0x%04x)", bittok2str(isis_subtlv_link_attribute_values, "Unknown", GET_BE_U_2(tptr)), GET_BE_U_2(tptr)); } break; case ISIS_SUBTLV_EXT_IS_REACH_LINK_PROTECTION_TYPE: if (subtlv_len >= 2) { ND_PRINT(", %s, Priority %u", bittok2str(gmpls_link_prot_values, "none", GET_U_1(tptr)), GET_U_1(tptr + 1)); } break; case ISIS_SUBTLV_SPB_METRIC: if (subtlv_len >= 6) { ND_PRINT(", LM: %u", GET_BE_U_3(tptr)); tptr += 3; subtlv_len -= 3; subtlv_sum_len -= 3; proc_bytes += 3; ND_PRINT(", P: %u", GET_U_1(tptr)); tptr++; subtlv_len--; subtlv_sum_len--; proc_bytes++; ND_PRINT(", P-ID: %u", GET_BE_U_2(tptr)); } break; case ISIS_SUBTLV_EXT_IS_REACH_INTF_SW_CAP_DESCR: if (subtlv_len >= 36) { gmpls_switch_cap = GET_U_1(tptr); ND_PRINT("%s Interface Switching Capability:%s", ident, tok2str(gmpls_switch_cap_values, "Unknown", gmpls_switch_cap)); ND_PRINT(", LSP Encoding: %s", tok2str(gmpls_encoding_values, "Unknown", GET_U_1((tptr + 1)))); tptr += 4; subtlv_len -= 4; subtlv_sum_len -= 4; proc_bytes += 4; ND_PRINT("%s Max LSP Bandwidth:", ident); for (priority_level = 0; priority_level < 8; priority_level++) { bw.i = GET_BE_U_4(tptr); ND_PRINT("%s priority level %u: %.3f Mbps", ident, priority_level, bw.f * 8 / 1000000); tptr += 4; subtlv_len -= 4; subtlv_sum_len -= 4; proc_bytes += 4; } switch (gmpls_switch_cap) { case GMPLS_PSC1: case GMPLS_PSC2: case GMPLS_PSC3: case GMPLS_PSC4: if (subtlv_len < 6) break; bw.i = GET_BE_U_4(tptr); ND_PRINT("%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f * 8 / 1000000); ND_PRINT("%s Interface MTU: %u", ident, GET_BE_U_2(tptr + 4)); break; case GMPLS_TSC: if (subtlv_len < 8) break; bw.i = GET_BE_U_4(tptr); ND_PRINT("%s Min LSP Bandwidth: %.3f Mbps", ident, bw.f * 8 / 1000000); ND_PRINT("%s Indication %s", ident, tok2str(gmpls_switch_cap_tsc_indication_values, "Unknown (%u)", GET_U_1((tptr + 4)))); break; default: /* there is some optional stuff left to decode but this is as of yet not specified so just lets hexdump what is left */ if (subtlv_len != 0) { if (!print_unknown_data(ndo, tptr, "\n\t\t ", subtlv_len)) return(0); } } } break; case ISIS_SUBTLV_EXT_IS_REACH_LAN_ADJ_SEGMENT_ID: if (subtlv_len >= 8) { ND_PRINT("%s Flags: [%s]", ident, bittok2str(isis_lan_adj_sid_flag_values, "none", GET_U_1(tptr))); int vflag = (GET_U_1(tptr) & 0x20) ? 1:0; int lflag = (GET_U_1(tptr) & 0x10) ? 1:0; tptr++; subtlv_len--; subtlv_sum_len--; proc_bytes++; ND_PRINT("%s Weight: %u", ident, GET_U_1(tptr)); tptr++; subtlv_len--; subtlv_sum_len--; proc_bytes++; if(subtlv_len>=SYSTEM_ID_LEN) { ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN); ND_PRINT("%s Neighbor System-ID: %s", ident, isis_print_id(ndo, tptr, SYSTEM_ID_LEN)); } /* RFC 8667 section 2.2.2 */ /* if V-flag is set to 1 and L-flag is set to 1 ==> 3 octet label */ /* if V-flag is set to 0 and L-flag is set to 0 ==> 4 octet index */ if (vflag && lflag) { ND_PRINT("%s Label: %u", ident, GET_BE_U_3(tptr+SYSTEM_ID_LEN)); } else if ((!vflag) && (!lflag)) { ND_PRINT("%s Index: %u", ident, GET_BE_U_4(tptr+SYSTEM_ID_LEN)); } else nd_print_invalid(ndo); } break; default: if (!print_unknown_data(ndo, tptr, "\n\t\t ", subtlv_len)) return(0); break; } tptr += subtlv_len; tlv_remaining -= subtlv_len; subtlv_sum_len -= subtlv_len; proc_bytes += subtlv_len; } } return(proc_bytes); trunc: return(0); } /* * this is the common Multi Topology ID decoder * it is called from various MT-TLVs (222,229,235,237) */ static uint8_t isis_print_mtid(netdissect_options *ndo, const uint8_t *tptr, const char *ident, u_int tlv_remaining) { if (tlv_remaining < 2) goto trunc; ND_PRINT("%s%s", ident, tok2str(isis_mt_values, "Reserved for IETF Consensus", ISIS_MASK_MTID(GET_BE_U_2(tptr)))); ND_PRINT(" Topology (0x%03x), Flags: [%s]", ISIS_MASK_MTID(GET_BE_U_2(tptr)), bittok2str(isis_mt_flag_values, "none",ISIS_MASK_MTFLAGS(GET_BE_U_2(tptr)))); return(2); trunc: return 0; } /* * 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 u_int isis_print_extd_ip_reach(netdissect_options *ndo, const uint8_t *tptr, const char *ident, uint16_t afi) { char ident_buffer[20]; uint8_t prefix[sizeof(nd_ipv6)]; /* shared copy buffer for IPv4 and IPv6 prefixes */ u_int metric, status_byte, bit_length, byte_length, sublen, processed, subtlvtype, subtlvlen; metric = GET_BE_U_4(tptr); processed=4; tptr+=4; if (afi == AF_INET) { status_byte=GET_U_1(tptr); tptr++; bit_length = status_byte&0x3f; if (bit_length > 32) { ND_PRINT("%sIPv4 prefix: bad bit length %u", ident, bit_length); return (0); } processed++; } else if (afi == AF_INET6) { status_byte=GET_U_1(tptr); bit_length=GET_U_1(tptr + 1); if (bit_length > 128) { ND_PRINT("%sIPv6 prefix: bad bit length %u", ident, bit_length); return (0); } tptr+=2; processed+=2; } else return (0); /* somebody is fooling us */ byte_length = (bit_length + 7) / 8; /* prefix has variable length encoding */ memset(prefix, 0, sizeof(prefix)); /* clear the copy buffer */ GET_CPY_BYTES(prefix,tptr,byte_length); /* copy as much as is stored in the TLV */ tptr+=byte_length; processed+=byte_length; if (afi == AF_INET) ND_PRINT("%sIPv4 prefix: %15s/%u", ident, ipaddr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IPADDR_STRING() */ bit_length); else if (afi == AF_INET6) ND_PRINT("%sIPv6 prefix: %s/%u", ident, ip6addr_string(ndo, prefix), /* local buffer, not packet data; don't use GET_IP6ADDR_STRING() */ bit_length); ND_PRINT(", Distribution: %s, Metric: %u", ISIS_MASK_TLV_EXTD_IP_UPDOWN(status_byte) ? "down" : "up", metric); if (afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)) ND_PRINT(", sub-TLVs present"); else if (afi == AF_INET6) ND_PRINT(", %s%s", ISIS_MASK_TLV_EXTD_IP6_IE(status_byte) ? "External" : "Internal", ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte) ? ", sub-TLVs present" : ""); if ((afi == AF_INET && ISIS_MASK_TLV_EXTD_IP_SUBTLV(status_byte)) || (afi == AF_INET6 && ISIS_MASK_TLV_EXTD_IP6_SUBTLV(status_byte)) ) { /* 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 */ sublen=GET_U_1(tptr); tptr++; processed+=sublen+1; ND_PRINT(" (%u)", sublen); /* print out subTLV length */ while (sublen>0) { subtlvtype=GET_U_1(tptr); subtlvlen=GET_U_1(tptr + 1); tptr+=2; /* prepend the indent string */ snprintf(ident_buffer, sizeof(ident_buffer), "%s ",ident); if (!isis_print_ip_reach_subtlv(ndo, tptr, subtlvtype, subtlvlen, ident_buffer)) return(0); tptr+=subtlvlen; sublen-=(subtlvlen+2); } } return (processed); } static void isis_print_router_cap_subtlv(netdissect_options *ndo, const uint8_t *tptr, uint8_t tlen) { uint8_t subt, subl; while (tlen >= 2) { subt = GET_U_1(tptr); subl = GET_U_1(tptr+1); tlen -= 2; tptr += 2; /* first lets see if we know the subTLVs name*/ ND_PRINT("\n\t\t%s subTLV #%u, length: %u", tok2str(isis_router_capability_subtlv_values, "unknown", subt), subt, subl); /* * Boundary check. */ if (subl > tlen) { break; } ND_TCHECK_LEN(tptr, subl); switch (subt) { case ISIS_SUBTLV_ROUTER_CAP_SR: { uint8_t flags, sid_tlen, sid_type, sid_len; uint32_t range; const uint8_t *sid_ptr; flags = GET_U_1(tptr); range = GET_BE_U_3(tptr+1); ND_PRINT(", Flags [%s], Range %u", bittok2str(isis_router_capability_sr_flags, "None", flags), range); sid_ptr = tptr + 4; sid_tlen = subl - 4; while (sid_tlen >= 5) { sid_type = GET_U_1(sid_ptr); sid_len = GET_U_1(sid_ptr+1); sid_tlen -= 2; sid_ptr += 2; /* * Boundary check. */ if (sid_len > sid_tlen) { break; } switch (sid_type) { case 1: if (sid_len == 3) { ND_PRINT(", SID value %u", GET_BE_U_3(sid_ptr)); } else if (sid_len == 4) { ND_PRINT(", SID value %u", GET_BE_U_4(sid_ptr)); } else { ND_PRINT(", Unknown SID length%u", sid_len); } break; default: print_unknown_data(ndo, sid_ptr, "\n\t\t ", sid_len); } sid_ptr += sid_len; sid_tlen -= sid_len; } } break; default: print_unknown_data(ndo, tptr, "\n\t\t", subl); break; } tlen -= subl; tptr += subl; } trunc: return; } /* * Clear checksum and lifetime prior to signature verification. */ static void isis_clear_checksum_lifetime(void *header) { struct isis_lsp_header *header_lsp = (struct isis_lsp_header *) header; header_lsp->checksum[0] = 0; header_lsp->checksum[1] = 0; header_lsp->remaining_lifetime[0] = 0; header_lsp->remaining_lifetime[1] = 0; } /* * isis_print * Decode IS-IS packets. Return 0 on error. */ #define INVALID_OR_DECREMENT(length,decr) \ if ((length) < (decr)) { \ ND_PRINT(" [packet length %u < %zu]", (length), (decr)); \ nd_print_invalid(ndo); \ return 1; \ } \ length -= (decr); static int isis_print(netdissect_options *ndo, const uint8_t *p, u_int length) { const struct isis_common_header *isis_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; uint8_t version, pdu_version, fixed_len; uint8_t pdu_type, pdu_max_area, max_area, pdu_id_length, id_length, tlv_type, tlv_len, tlen, alen, prefix_len; u_int ext_is_len, ext_ip_len; uint8_t mt_len; uint8_t isis_subtlv_idrp; const uint8_t *optr, *pptr, *tptr; u_int packet_len; u_short pdu_len, key_id; u_int i,vendor_id, num_vals; uint8_t auth_type; uint8_t num_system_ids; int sigcheck; ndo->ndo_protocol = "isis"; packet_len=length; optr = p; /* initialize the _o_riginal pointer to the packet start - need it for parsing the checksum TLV and authentication TLV verification */ isis_header = (const struct isis_common_header *)p; ND_TCHECK_SIZE(isis_header); if (length < ISIS_COMMON_HEADER_SIZE) goto trunc; 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; if (!ndo->ndo_eflag) ND_PRINT("IS-IS"); /* * Sanity checking of the header. */ version = GET_U_1(isis_header->version); if (version != ISIS_VERSION) { ND_PRINT("version %u packet not supported", version); return (0); } pdu_id_length = GET_U_1(isis_header->id_length); if ((pdu_id_length != SYSTEM_ID_LEN) && (pdu_id_length != 0)) { ND_PRINT("system ID length of %u is not supported", pdu_id_length); return (0); } pdu_version = GET_U_1(isis_header->pdu_version); if (pdu_version != ISIS_VERSION) { ND_PRINT("version %u packet not supported", pdu_version); return (0); } fixed_len = GET_U_1(isis_header->fixed_len); if (length < fixed_len) { ND_PRINT("fixed header length %u > packet length %u", fixed_len, length); return (0); } if (fixed_len < ISIS_COMMON_HEADER_SIZE) { ND_PRINT("fixed header length %u < minimum header size %u", fixed_len, (u_int)ISIS_COMMON_HEADER_SIZE); return (0); } pdu_max_area = GET_U_1(isis_header->max_area); switch(pdu_max_area) { case 0: max_area = 3; /* silly shit */ break; case 255: ND_PRINT("bad packet -- 255 areas"); return (0); default: max_area = pdu_max_area; break; } switch(pdu_id_length) { case 0: id_length = 6; /* silly shit again */ break; case 1: /* 1-8 are valid sys-ID lengths */ case 2: case 3: case 4: case 5: case 6: case 7: case 8: id_length = pdu_id_length; break; case 255: id_length = 0; /* entirely useless */ break; default: id_length = pdu_id_length; break; } /* toss any non 6-byte sys-ID len PDUs */ if (id_length != 6 ) { ND_PRINT("bad packet -- illegal sys-ID length (%u)", id_length); return (0); } pdu_type = GET_U_1(isis_header->pdu_type); /* in non-verbose mode print the basic PDU Type plus PDU specific brief information*/ if (ndo->ndo_vflag == 0) { ND_PRINT("%s%s", ndo->ndo_eflag ? "" : ", ", tok2str(isis_pdu_values, "unknown PDU-Type %u", pdu_type)); } else { /* ok they seem to want to know everything - lets fully decode it */ ND_PRINT("%slength %u", ndo->ndo_eflag ? "" : ", ", length); ND_PRINT("\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), fixed_len, version, pdu_version, id_length, pdu_id_length, max_area, pdu_max_area); if (ndo->ndo_vflag > 1) { if (!print_unknown_data(ndo, optr, "\n\t", 8)) /* provide the _o_riginal pointer */ return (0); /* for optionally debugging the common header */ } } switch (pdu_type) { case ISIS_PDU_L1_LAN_IIH: case ISIS_PDU_L2_LAN_IIH: if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE)) { ND_PRINT(", bogus fixed header length %u should be %zu", fixed_len, ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); return (0); } ND_TCHECK_SIZE(header_iih_lan); if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE) goto trunc; if (ndo->ndo_vflag == 0) { ND_PRINT(", src-id %s", isis_print_id(ndo, header_iih_lan->source_id, SYSTEM_ID_LEN)); ND_PRINT(", lan-id %s, prio %u", isis_print_id(ndo, header_iih_lan->lan_id,NODE_ID_LEN), GET_U_1(header_iih_lan->priority)); ND_PRINT(", length %u", length); return (1); } pdu_len=GET_BE_U_2(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; } ND_PRINT("\n\t source-id: %s, holding time: %us, Flags: [%s]", isis_print_id(ndo, header_iih_lan->source_id,SYSTEM_ID_LEN), GET_BE_U_2(header_iih_lan->holding_time), tok2str(isis_iih_circuit_type_values, "unknown circuit type 0x%02x", GET_U_1(header_iih_lan->circuit_type))); ND_PRINT("\n\t lan-id: %s, Priority: %u, PDU length: %u", isis_print_id(ndo, header_iih_lan->lan_id, NODE_ID_LEN), GET_U_1(header_iih_lan->priority) & ISIS_LAN_PRIORITY_MASK, pdu_len); if (ndo->ndo_vflag > 1) { if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_LAN_HEADER_SIZE)) return (0); } INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_LAN_HEADER_SIZE); break; case ISIS_PDU_PTP_IIH: if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE)) { ND_PRINT(", bogus fixed header length %u should be %zu", fixed_len, ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); return (0); } ND_TCHECK_SIZE(header_iih_ptp); if (length < ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE) goto trunc; if (ndo->ndo_vflag == 0) { ND_PRINT(", src-id %s", isis_print_id(ndo, header_iih_ptp->source_id, SYSTEM_ID_LEN)); ND_PRINT(", length %u", length); return (1); } pdu_len=GET_BE_U_2(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; } ND_PRINT("\n\t source-id: %s, holding time: %us, Flags: [%s]", isis_print_id(ndo, header_iih_ptp->source_id,SYSTEM_ID_LEN), GET_BE_U_2(header_iih_ptp->holding_time), tok2str(isis_iih_circuit_type_values, "unknown circuit type 0x%02x", GET_U_1(header_iih_ptp->circuit_type))); ND_PRINT("\n\t circuit-id: 0x%02x, PDU length: %u", GET_U_1(header_iih_ptp->circuit_id), pdu_len); if (ndo->ndo_vflag > 1) { if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_IIH_PTP_HEADER_SIZE)) return (0); } INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_IIH_PTP_HEADER_SIZE); break; case ISIS_PDU_L1_LSP: case ISIS_PDU_L2_LSP: if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE)) { ND_PRINT(", bogus fixed header length %u should be %zu", fixed_len, ISIS_LSP_HEADER_SIZE); return (0); } ND_TCHECK_SIZE(header_lsp); if (length < ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE) goto trunc; if (ndo->ndo_vflag == 0) { ND_PRINT(", lsp-id %s, seq 0x%08x, lifetime %5us", isis_print_id(ndo, header_lsp->lsp_id, LSP_ID_LEN), GET_BE_U_4(header_lsp->sequence_number), GET_BE_U_2(header_lsp->remaining_lifetime)); ND_PRINT(", length %u", length); return (1); } pdu_len=GET_BE_U_2(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; } ND_PRINT("\n\t lsp-id: %s, seq: 0x%08x, lifetime: %5us\n\t chksum: 0x%04x", isis_print_id(ndo, header_lsp->lsp_id, LSP_ID_LEN), GET_BE_U_4(header_lsp->sequence_number), GET_BE_U_2(header_lsp->remaining_lifetime), GET_BE_U_2(header_lsp->checksum)); osi_print_cksum(ndo, (const uint8_t *)header_lsp->lsp_id, GET_BE_U_2(header_lsp->checksum), 12, length-12); ND_PRINT(", PDU length: %u, Flags: [ %s", pdu_len, ISIS_MASK_LSP_OL_BIT(header_lsp->typeblock) ? "Overload bit set, " : ""); if (ISIS_MASK_LSP_ATT_BITS(header_lsp->typeblock)) { ND_PRINT("%s", ISIS_MASK_LSP_ATT_DEFAULT_BIT(header_lsp->typeblock) ? "default " : ""); ND_PRINT("%s", ISIS_MASK_LSP_ATT_DELAY_BIT(header_lsp->typeblock) ? "delay " : ""); ND_PRINT("%s", ISIS_MASK_LSP_ATT_EXPENSE_BIT(header_lsp->typeblock) ? "expense " : ""); ND_PRINT("%s", ISIS_MASK_LSP_ATT_ERROR_BIT(header_lsp->typeblock) ? "error " : ""); ND_PRINT("ATT bit set, "); } ND_PRINT("%s", ISIS_MASK_LSP_PARTITION_BIT(header_lsp->typeblock) ? "P bit set, " : ""); ND_PRINT("%s ]", tok2str(isis_lsp_istype_values, "Unknown(0x%x)", ISIS_MASK_LSP_ISTYPE_BITS(header_lsp->typeblock))); if (ndo->ndo_vflag > 1) { if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_LSP_HEADER_SIZE)) return (0); } INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE); pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_LSP_HEADER_SIZE); break; case ISIS_PDU_L1_CSNP: case ISIS_PDU_L2_CSNP: if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE)) { ND_PRINT(", bogus fixed header length %u should be %zu", fixed_len, ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); return (0); } ND_TCHECK_SIZE(header_csnp); if (length < ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE) goto trunc; if (ndo->ndo_vflag == 0) { ND_PRINT(", src-id %s", isis_print_id(ndo, header_csnp->source_id, NODE_ID_LEN)); ND_PRINT(", length %u", length); return (1); } pdu_len=GET_BE_U_2(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; } ND_PRINT("\n\t source-id: %s, PDU length: %u", isis_print_id(ndo, header_csnp->source_id, NODE_ID_LEN), pdu_len); ND_PRINT("\n\t start lsp-id: %s", isis_print_id(ndo, header_csnp->start_lsp_id, LSP_ID_LEN)); ND_PRINT("\n\t end lsp-id: %s", isis_print_id(ndo, header_csnp->end_lsp_id, LSP_ID_LEN)); if (ndo->ndo_vflag > 1) { if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_CSNP_HEADER_SIZE)) return (0); } INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_CSNP_HEADER_SIZE); break; case ISIS_PDU_L1_PSNP: case ISIS_PDU_L2_PSNP: if (fixed_len != (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE)) { ND_PRINT("- bogus fixed header length %u should be %zu", fixed_len, ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); return (0); } ND_TCHECK_SIZE(header_psnp); if (length < ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE) goto trunc; if (ndo->ndo_vflag == 0) { ND_PRINT(", src-id %s", isis_print_id(ndo, header_psnp->source_id, NODE_ID_LEN)); ND_PRINT(", length %u", length); return (1); } pdu_len=GET_BE_U_2(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; } ND_PRINT("\n\t source-id: %s, PDU length: %u", isis_print_id(ndo, header_psnp->source_id, NODE_ID_LEN), pdu_len); if (ndo->ndo_vflag > 1) { if (!print_unknown_data(ndo, pptr, "\n\t ", ISIS_PSNP_HEADER_SIZE)) return (0); } INVALID_OR_DECREMENT(packet_len,ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); pptr = p + (ISIS_COMMON_HEADER_SIZE+ISIS_PSNP_HEADER_SIZE); break; default: if (ndo->ndo_vflag == 0) { ND_PRINT(", length %u", length); return (1); } (void)print_unknown_data(ndo, pptr, "\n\t ", length); return (0); } /* * Now print the TLV's. */ while (packet_len > 0) { ND_TCHECK_2(pptr); if (packet_len < 2) goto trunc; tlv_type = GET_U_1(pptr); tlv_len = GET_U_1(pptr + 1); pptr += 2; packet_len -= 2; tlen = tlv_len; /* copy temporary len & pointer to packet data */ tptr = pptr; /* first lets see if we know the TLVs name*/ ND_PRINT("\n\t %s TLV #%u, length: %u", tok2str(isis_tlv_values, "unknown", tlv_type), tlv_type, tlv_len); if (packet_len < tlv_len) goto trunc; /* now check if we have a decoder otherwise do a hexdump at the end*/ switch (tlv_type) { case ISIS_TLV_AREA_ADDR: while (tlen != 0) { alen = GET_U_1(tptr); tptr++; tlen--; if (tlen < alen) goto tlv_trunc; ND_PRINT("\n\t Area address (length: %u): %s", alen, GET_ISONSAP_STRING(tptr, alen)); tptr += alen; tlen -= alen; } break; case ISIS_TLV_ISNEIGH: while (tlen != 0) { if (tlen < MAC_ADDR_LEN) goto tlv_trunc; ND_TCHECK_LEN(tptr, MAC_ADDR_LEN); ND_PRINT("\n\t SNPA: %s", isis_print_id(ndo, tptr, MAC_ADDR_LEN)); tlen -= MAC_ADDR_LEN; tptr += MAC_ADDR_LEN; } break; case ISIS_TLV_INSTANCE_ID: if (tlen < 4) goto tlv_trunc; num_vals = (tlen-2)/2; ND_PRINT("\n\t Instance ID: %u, ITIDs(%u)%s ", GET_BE_U_2(tptr), num_vals, num_vals ? ":" : ""); tptr += 2; tlen -= 2; for (i=0; i < num_vals; i++) { ND_PRINT("%u", GET_BE_U_2(tptr)); if (i < (num_vals - 1)) { ND_PRINT(", "); } tptr += 2; tlen -= 2; } break; case ISIS_TLV_PADDING: break; case ISIS_TLV_MT_IS_REACH: mt_len = isis_print_mtid(ndo, tptr, "\n\t ", tlen); if (mt_len == 0) /* did something go wrong ? */ goto trunc; tptr+=mt_len; tlen-=mt_len; while (tlen != 0) { ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type, tlen); if (ext_is_len == 0) /* did something go wrong ? */ goto trunc; if (tlen < ext_is_len) { ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_is_len); nd_print_invalid(ndo); break; } tlen-=(uint8_t)ext_is_len; tptr+=(uint8_t)ext_is_len; } break; case ISIS_TLV_IS_ALIAS_ID: while (tlen != 0) { ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type, tlen); if (ext_is_len == 0) /* did something go wrong ? */ goto trunc; if (tlen < ext_is_len) { ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_is_len); nd_print_invalid(ndo); break; } tlen-=(uint8_t)ext_is_len; tptr+=(uint8_t)ext_is_len; } break; case ISIS_TLV_EXT_IS_REACH: while (tlen != 0) { ext_is_len = isis_print_ext_is_reach(ndo, tptr, "\n\t ", tlv_type, tlen); if (ext_is_len == 0) /* did something go wrong ? */ goto trunc; if (tlen < ext_is_len) { ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_is_len); nd_print_invalid(ndo); break; } tlen-=(uint8_t)ext_is_len; tptr+=(uint8_t)ext_is_len; } break; case ISIS_TLV_IS_REACH: if (tlen < 1) goto tlv_trunc; ND_PRINT("\n\t %s", tok2str(isis_is_reach_virtual_values, "bogus virtual flag 0x%02x", GET_U_1(tptr))); tptr++; tlen--; tlv_is_reach = (const struct isis_tlv_is_reach *)tptr; while (tlen != 0) { if (tlen < sizeof(struct isis_tlv_is_reach)) goto tlv_trunc; ND_TCHECK_SIZE(tlv_is_reach); ND_PRINT("\n\t IS Neighbor: %s", isis_print_id(ndo, tlv_is_reach->neighbor_nodeid, NODE_ID_LEN)); isis_print_metric_block(ndo, &tlv_is_reach->isis_metric_block); tlen -= sizeof(struct isis_tlv_is_reach); tlv_is_reach++; } break; case ISIS_TLV_ESNEIGH: tlv_es_reach = (const struct isis_tlv_es_reach *)tptr; while (tlen != 0) { if (tlen < sizeof(struct isis_tlv_es_reach)) goto tlv_trunc; ND_TCHECK_SIZE(tlv_es_reach); ND_PRINT("\n\t ES Neighbor: %s", isis_print_id(ndo, tlv_es_reach->neighbor_sysid, SYSTEM_ID_LEN)); isis_print_metric_block(ndo, &tlv_es_reach->isis_metric_block); tlen -= sizeof(struct isis_tlv_es_reach); tlv_es_reach++; } break; /* those two TLVs share the same format */ case ISIS_TLV_INT_IP_REACH: case ISIS_TLV_EXT_IP_REACH: if (!isis_print_tlv_ip_reach(ndo, pptr, "\n\t ", tlv_len)) return (1); break; case ISIS_TLV_EXTD_IP_REACH: while (tlen != 0) { ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunc; if (tlen < ext_ip_len) { ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_ip_len); nd_print_invalid(ndo); break; } tlen-=(uint8_t)ext_ip_len; tptr+=(uint8_t)ext_ip_len; } break; case ISIS_TLV_MT_IP_REACH: mt_len = isis_print_mtid(ndo, tptr, "\n\t ", tlen); if (mt_len == 0) { /* did something go wrong ? */ goto trunc; } tptr+=mt_len; tlen-=mt_len; while (tlen != 0) { ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunc; if (tlen < ext_ip_len) { ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_ip_len); nd_print_invalid(ndo); break; } tlen-=(uint8_t)ext_ip_len; tptr+=(uint8_t)ext_ip_len; } break; case ISIS_TLV_IP6_REACH: while (tlen != 0) { ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET6); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunc; if (tlen < ext_ip_len) { ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_ip_len); nd_print_invalid(ndo); break; } tlen-=(uint8_t)ext_ip_len; tptr+=(uint8_t)ext_ip_len; } break; case ISIS_TLV_MT_IP6_REACH: mt_len = isis_print_mtid(ndo, tptr, "\n\t ", tlen); if (mt_len == 0) { /* did something go wrong ? */ goto trunc; } tptr+=mt_len; tlen-=mt_len; while (tlen != 0) { ext_ip_len = isis_print_extd_ip_reach(ndo, tptr, "\n\t ", AF_INET6); if (ext_ip_len == 0) /* did something go wrong ? */ goto trunc; if (tlen < ext_ip_len) { ND_PRINT(" [remaining tlv length %u < %u]", tlen, ext_ip_len); nd_print_invalid(ndo); break; } tlen-=(uint8_t)ext_ip_len; tptr+=(uint8_t)ext_ip_len; } break; case ISIS_TLV_IP6ADDR: while (tlen != 0) { if (tlen < sizeof(nd_ipv6)) goto tlv_trunc; ND_PRINT("\n\t IPv6 interface address: %s", GET_IP6ADDR_STRING(tptr)); tptr += sizeof(nd_ipv6); tlen -= sizeof(nd_ipv6); } break; case ISIS_TLV_AUTH: if (tlen < 1) goto tlv_trunc; auth_type = GET_U_1(tptr); tptr++; tlen--; ND_PRINT("\n\t %s: ", tok2str(isis_subtlv_auth_values, "unknown Authentication type 0x%02x", auth_type)); switch (auth_type) { case ISIS_SUBTLV_AUTH_SIMPLE: nd_printjnp(ndo, tptr, tlen); break; case ISIS_SUBTLV_AUTH_MD5: for(i=0;i=1) { ND_PRINT("\n\t Adjacency State: %s (%u)", tok2str(isis_ptp_adjacency_values, "unknown", GET_U_1(tptr)), GET_U_1(tptr)); tlen--; } if(tlen>sizeof(tlv_ptp_adj->extd_local_circuit_id)) { ND_PRINT("\n\t Extended Local circuit-ID: 0x%08x", GET_BE_U_4(tlv_ptp_adj->extd_local_circuit_id)); tlen-=sizeof(tlv_ptp_adj->extd_local_circuit_id); } if(tlen>=SYSTEM_ID_LEN) { ND_TCHECK_LEN(tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN); ND_PRINT("\n\t Neighbor System-ID: %s", isis_print_id(ndo, tlv_ptp_adj->neighbor_sysid, SYSTEM_ID_LEN)); tlen-=SYSTEM_ID_LEN; } if(tlen>=sizeof(tlv_ptp_adj->neighbor_extd_local_circuit_id)) { ND_PRINT("\n\t Neighbor Extended Local circuit-ID: 0x%08x", GET_BE_U_4(tlv_ptp_adj->neighbor_extd_local_circuit_id)); } break; case ISIS_TLV_PROTOCOLS: ND_PRINT("\n\t NLPID(s): "); while (tlen != 0) { ND_PRINT("%s (0x%02x)", tok2str(nlpid_values, "unknown", GET_U_1(tptr)), GET_U_1(tptr)); if (tlen>1) /* further NPLIDs ? - put comma */ ND_PRINT(", "); tptr++; tlen--; } break; case ISIS_TLV_MT_PORT_CAP: { if (tlen < 2) goto tlv_trunc; ND_PRINT("\n\t RES: %u, MTID(s): %u", (GET_BE_U_2(tptr) >> 12), (GET_BE_U_2(tptr) & 0x0fff)); tptr += 2; tlen -= 2; if (tlen) isis_print_mt_port_cap_subtlv(ndo, tptr, tlen); break; } case ISIS_TLV_MT_CAPABILITY: if (tlen < 2) goto tlv_trunc; ND_PRINT("\n\t O: %u, RES: %u, MTID(s): %u", (GET_BE_U_2(tptr) >> 15) & 0x01, (GET_BE_U_2(tptr) >> 12) & 0x07, GET_BE_U_2(tptr) & 0x0fff); tptr += 2; tlen -= 2; if (tlen) isis_print_mt_capability_subtlv(ndo, tptr, tlen); break; case ISIS_TLV_TE_ROUTER_ID: if (tlen < sizeof(nd_ipv4)) goto tlv_trunc; ND_PRINT("\n\t Traffic Engineering Router ID: %s", GET_IPADDR_STRING(pptr)); break; case ISIS_TLV_IPADDR: while (tlen != 0) { if (tlen < sizeof(nd_ipv4)) goto tlv_trunc; ND_PRINT("\n\t IPv4 interface address: %s", GET_IPADDR_STRING(tptr)); tptr += sizeof(nd_ipv4); tlen -= sizeof(nd_ipv4); } break; case ISIS_TLV_HOSTNAME: ND_PRINT("\n\t Hostname: "); nd_printjnp(ndo, tptr, tlen); break; case ISIS_TLV_SHARED_RISK_GROUP: if (tlen < NODE_ID_LEN) break; ND_TCHECK_LEN(tptr, NODE_ID_LEN); ND_PRINT("\n\t IS Neighbor: %s", isis_print_id(ndo, tptr, NODE_ID_LEN)); tptr+=NODE_ID_LEN; tlen-=NODE_ID_LEN; if (tlen < 1) break; ND_PRINT(", Flags: [%s]", ISIS_MASK_TLV_SHARED_RISK_GROUP(GET_U_1(tptr)) ? "numbered" : "unnumbered"); tptr++; tlen--; if (tlen < sizeof(nd_ipv4)) break; ND_PRINT("\n\t IPv4 interface address: %s", GET_IPADDR_STRING(tptr)); tptr+=sizeof(nd_ipv4); tlen-=sizeof(nd_ipv4); if (tlen < sizeof(nd_ipv4)) break; ND_PRINT("\n\t IPv4 neighbor address: %s", GET_IPADDR_STRING(tptr)); tptr+=sizeof(nd_ipv4); tlen-=sizeof(nd_ipv4); while (tlen != 0) { if (tlen < 4) goto tlv_trunc; ND_PRINT("\n\t Link-ID: 0x%08x", GET_BE_U_4(tptr)); tptr+=4; tlen-=4; } break; case ISIS_TLV_LSP: tlv_lsp = (const struct isis_tlv_lsp *)tptr; while (tlen != 0) { if (tlen < sizeof(struct isis_tlv_lsp)) goto tlv_trunc; ND_TCHECK_1(tlv_lsp->lsp_id + LSP_ID_LEN - 1); ND_PRINT("\n\t lsp-id: %s", isis_print_id(ndo, tlv_lsp->lsp_id, LSP_ID_LEN)); ND_PRINT(", seq: 0x%08x", GET_BE_U_4(tlv_lsp->sequence_number)); ND_PRINT(", lifetime: %5ds", GET_BE_U_2(tlv_lsp->remaining_lifetime)); ND_PRINT(", chksum: 0x%04x", GET_BE_U_2(tlv_lsp->checksum)); tlen-=sizeof(struct isis_tlv_lsp); tlv_lsp++; } break; case ISIS_TLV_CHECKSUM: if (tlen < ISIS_TLV_CHECKSUM_MINLEN) break; ND_TCHECK_LEN(tptr, ISIS_TLV_CHECKSUM_MINLEN); ND_PRINT("\n\t checksum: 0x%04x ", GET_BE_U_2(tptr)); /* do not attempt to verify the checksum if it is zero * most likely a HMAC-MD5 TLV is also present and * to avoid conflicts the checksum TLV is zeroed. * see rfc3358 for details */ osi_print_cksum(ndo, optr, GET_BE_U_2(tptr), (int)(tptr-optr), length); break; case ISIS_TLV_POI: if (tlen < 1) goto tlv_trunc; num_system_ids = GET_U_1(tptr); tptr++; tlen--; if (num_system_ids == 0) { /* Not valid */ ND_PRINT(" No system IDs supplied"); } else { if (tlen < SYSTEM_ID_LEN) goto tlv_trunc; ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN); ND_PRINT("\n\t Purge Originator System-ID: %s", isis_print_id(ndo, tptr, SYSTEM_ID_LEN)); tptr += SYSTEM_ID_LEN; tlen -= SYSTEM_ID_LEN; if (num_system_ids > 1) { if (tlen < SYSTEM_ID_LEN) goto tlv_trunc; ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN); ND_TCHECK_LEN(tptr, 2 * SYSTEM_ID_LEN + 1); ND_PRINT("\n\t Received from System-ID: %s", isis_print_id(ndo, tptr, SYSTEM_ID_LEN)); } } break; case ISIS_TLV_MT_SUPPORTED: while (tlen != 0) { /* length can only be a multiple of 2, otherwise there is something broken -> so decode down until length is 1 */ if (tlen!=1) { mt_len = isis_print_mtid(ndo, tptr, "\n\t ", tlen); if (mt_len == 0) /* did something go wrong ? */ goto trunc; tptr+=mt_len; tlen-=mt_len; } else { ND_PRINT("\n\t invalid MT-ID"); break; } } break; case ISIS_TLV_RESTART_SIGNALING: /* first attempt to decode the flags */ if (tlen < ISIS_TLV_RESTART_SIGNALING_FLAGLEN) break; ND_TCHECK_LEN(tptr, ISIS_TLV_RESTART_SIGNALING_FLAGLEN); ND_PRINT("\n\t Flags [%s]", bittok2str(isis_restart_flag_values, "none", GET_U_1(tptr))); tptr+=ISIS_TLV_RESTART_SIGNALING_FLAGLEN; tlen-=ISIS_TLV_RESTART_SIGNALING_FLAGLEN; /* is there anything other than the flags field? */ if (tlen == 0) break; if (tlen < ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN) break; ND_TCHECK_LEN(tptr, ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN); ND_PRINT(", Remaining holding time %us", GET_BE_U_2(tptr)); tptr+=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN; tlen-=ISIS_TLV_RESTART_SIGNALING_HOLDTIMELEN; /* is there an additional sysid field present ?*/ if (tlen == SYSTEM_ID_LEN) { ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN); ND_PRINT(", for %s", isis_print_id(ndo, tptr,SYSTEM_ID_LEN)); } break; case ISIS_TLV_IDRP_INFO: if (tlen < 1) break; isis_subtlv_idrp = GET_U_1(tptr); ND_PRINT("\n\t Inter-Domain Information Type: %s", tok2str(isis_subtlv_idrp_values, "Unknown (0x%02x)", isis_subtlv_idrp)); tptr++; tlen--; switch (isis_subtlv_idrp) { case ISIS_SUBTLV_IDRP_ASN: if (tlen < 2) goto tlv_trunc; ND_PRINT("AS Number: %u", GET_BE_U_2(tptr)); break; case ISIS_SUBTLV_IDRP_LOCAL: case ISIS_SUBTLV_IDRP_RES: default: if (!print_unknown_data(ndo, tptr, "\n\t ", tlen)) return(0); break; } break; case ISIS_TLV_LSP_BUFFERSIZE: if (tlen < 2) break; ND_PRINT("\n\t LSP Buffersize: %u", GET_BE_U_2(tptr)); break; case ISIS_TLV_PART_DIS: while (tlen != 0) { if (tlen < SYSTEM_ID_LEN) goto tlv_trunc; ND_TCHECK_LEN(tptr, SYSTEM_ID_LEN); ND_PRINT("\n\t %s", isis_print_id(ndo, tptr, SYSTEM_ID_LEN)); tptr+=SYSTEM_ID_LEN; tlen-=SYSTEM_ID_LEN; } break; case ISIS_TLV_PREFIX_NEIGH: if (tlen < sizeof(struct isis_metric_block)) break; ND_TCHECK_LEN(tptr, sizeof(struct isis_metric_block)); ND_PRINT("\n\t Metric Block"); isis_print_metric_block(ndo, (const struct isis_metric_block *)tptr); tptr+=sizeof(struct isis_metric_block); tlen-=sizeof(struct isis_metric_block); while (tlen != 0) { prefix_len=GET_U_1(tptr); /* read out prefix length in semioctets*/ tptr++; tlen--; if (prefix_len < 2) { ND_PRINT("\n\t\tAddress: prefix length %u < 2", prefix_len); break; } if (tlen < prefix_len/2) break; ND_PRINT("\n\t\tAddress: %s/%u", GET_ISONSAP_STRING(tptr, prefix_len / 2), prefix_len * 4); tptr+=prefix_len/2; tlen-=prefix_len/2; } break; case ISIS_TLV_IIH_SEQNR: if (tlen < 4) break; ND_PRINT("\n\t Sequence number: %u", GET_BE_U_4(tptr)); break; case ISIS_TLV_ROUTER_CAPABILITY: if (tlen < 5) { ND_PRINT(" [object length %u < 5]", tlen); nd_print_invalid(ndo); break; } ND_PRINT("\n\t Router-ID %s", GET_IPADDR_STRING(tptr)); ND_PRINT(", Flags [%s]", bittok2str(isis_tlv_router_capability_flags, "none", GET_U_1(tptr+4))); /* Optional set of sub-TLV */ if (tlen > 5) { isis_print_router_cap_subtlv(ndo, tptr+5, tlen-5); } break; case ISIS_TLV_VENDOR_PRIVATE: if (tlen < 3) break; vendor_id = GET_BE_U_3(tptr); ND_PRINT("\n\t Vendor: %s (%u)", tok2str(oui_values, "Unknown", vendor_id), vendor_id); tptr+=3; tlen-=3; if (tlen != 0) /* hexdump the rest */ if (!print_unknown_data(ndo, tptr, "\n\t\t", tlen)) return(0); break; /* * FIXME those are the defined TLVs that lack a decoder * you are welcome to contribute code ;-) */ case ISIS_TLV_DECNET_PHASE4: case ISIS_TLV_LUCENT_PRIVATE: case ISIS_TLV_IPAUTH: case ISIS_TLV_NORTEL_PRIVATE1: case ISIS_TLV_NORTEL_PRIVATE2: default: if (ndo->ndo_vflag <= 1) { if (!print_unknown_data(ndo, pptr, "\n\t\t", tlv_len)) return(0); } break; } tlv_trunc: /* do we want to see an additionally hexdump ? */ if (ndo->ndo_vflag> 1) { if (!print_unknown_data(ndo, pptr, "\n\t ", tlv_len)) return(0); } pptr += tlv_len; packet_len -= tlv_len; } if (packet_len != 0) { ND_PRINT("\n\t %u straggler bytes", packet_len); } return (1); trunc: nd_print_trunc(ndo); return (1); } static void osi_print_cksum(netdissect_options *ndo, const uint8_t *pptr, uint16_t checksum, int checksum_offset, u_int length) { uint16_t calculated_checksum; /* do not attempt to verify the checksum if it is zero, * if the offset is nonsense, * or the base pointer is not sane */ if (!checksum || checksum_offset < 0 || !ND_TTEST_2(pptr + checksum_offset) || (u_int)checksum_offset > length || !ND_TTEST_LEN(pptr, length)) { ND_PRINT(" (unverified)"); } else { #if 0 ND_PRINT("\nosi_print_cksum: %p %d %u\n", pptr, checksum_offset, length); #endif calculated_checksum = create_osi_cksum(pptr, checksum_offset, length); if (checksum == calculated_checksum) { ND_PRINT(" (correct)"); } else { ND_PRINT(" (incorrect should be 0x%04x)", calculated_checksum); } } }