/* packet-isis-lsp.c * Routines for decoding isis lsp packets and their CLVs * * $Id$ * Stuart Stanley * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /* * Copyright 2011, Malgi Nikitha Vivekananda * Krishnamurthy Mayya * - Decoding for Router Capability TLV and associated subTLVs as per RFC 6326 * - Decoding for Group Address TLV and associated subTLVs as per RFC 6326 */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include "packet-osi.h" #include "packet-isis.h" #include "packet-isis-clv.h" #include "packet-isis-lsp.h" #include #include #include /* Sub-TLVs under Router Capability TLV As per RFC 6326 section 2.3 */ #define TRILL_VERSION 12 #define NICKNAME 6 #define TREES 7 #define TREE_IDENTIFIER 8 #define TREES_USED_IDENTIFIER 9 #define INTERESTED_VLANS 10 #define VLAN_GROUP 13 /*Sub-TLVs under Group Address TLV*/ #define GRP_MAC_ADDRESS 1 #define FP_HMAC_SWID_MASK G_GINT64_CONSTANT(0xFFFF00000000) #define FP_HMAC_SSWID_MASK G_GINT64_CONSTANT(0x0000FFFF0000) #define FP_HMAC_LID_MASK G_GINT64_CONSTANT(0x00000000FFFF) /* lsp packets */ static int hf_isis_lsp_pdu_length = -1; static int hf_isis_lsp_remaining_life = -1; static int hf_isis_lsp_sequence_number = -1; static int hf_isis_lsp_lsp_id = -1; static int hf_isis_lsp_hostname = -1; static int hf_isis_lsp_checksum = -1; static int hf_isis_lsp_checksum_bad = -1; static int hf_isis_lsp_checksum_good = -1; static int hf_isis_lsp_clv_ipv4_int_addr = -1; static int hf_isis_lsp_clv_ipv6_int_addr = -1; static int hf_isis_lsp_clv_te_router_id = -1; static int hf_isis_lsp_clv_mt = -1; static int hf_isis_lsp_p = -1; static int hf_isis_lsp_att = -1; static int hf_isis_lsp_hippity = -1; static int hf_isis_lsp_is_type = -1; static int hf_isis_lsp_root_id = -1; static int hf_isis_lsp_spb_link_metric = -1; static int hf_isis_lsp_spb_port_count = -1; static int hf_isis_lsp_spb_port_id = -1; static gint ett_isis_lsp = -1; static gint ett_isis_lsp_info = -1; static gint ett_isis_lsp_att = -1; static gint ett_isis_lsp_cksum = -1; static gint ett_isis_lsp_clv_area_addr = -1; static gint ett_isis_lsp_clv_is_neighbors = -1; static gint ett_isis_lsp_clv_ext_is_reachability = -1; /* CLV 22 */ static gint ett_isis_lsp_part_of_clv_ext_is_reachability = -1; static gint ett_isis_lsp_subclv_admin_group = -1; static gint ett_isis_lsp_subclv_unrsv_bw = -1; static gint ett_isis_lsp_subclv_spb_link_metric = -1; static gint ett_isis_lsp_clv_unknown = -1; static gint ett_isis_lsp_clv_partition_dis = -1; static gint ett_isis_lsp_clv_prefix_neighbors = -1; static gint ett_isis_lsp_clv_nlpid = -1; static gint ett_isis_lsp_clv_hostname = -1; static gint ett_isis_lsp_clv_te_router_id = -1; static gint ett_isis_lsp_clv_authentication = -1; static gint ett_isis_lsp_clv_ip_authentication = -1; static gint ett_isis_lsp_clv_ipv4_int_addr = -1; static gint ett_isis_lsp_clv_ipv6_int_addr = -1; /* CLV 232 */ static gint ett_isis_lsp_clv_mt_cap = -1; static gint ett_isis_lsp_clv_mt_cap_spb_instance = -1; static gint ett_isis_lsp_clv_mt_cap_spbm_service_identifier = -1; static gint ett_isis_lsp_clv_ip_reachability = -1; static gint ett_isis_lsp_clv_ip_reach_subclv = -1; static gint ett_isis_lsp_clv_ext_ip_reachability = -1; /* CLV 135 */ static gint ett_isis_lsp_part_of_clv_ext_ip_reachability = -1; static gint ett_isis_lsp_clv_ipv6_reachability = -1; /* CLV 236 */ static gint ett_isis_lsp_part_of_clv_ipv6_reachability = -1; static gint ett_isis_lsp_clv_mt = -1; static gint ett_isis_lsp_clv_mt_is = -1; static gint ett_isis_lsp_part_of_clv_mt_is = -1; static gint ett_isis_lsp_clv_mt_reachable_IPv4_prefx = -1; /* CLV 235 */ static gint ett_isis_lsp_clv_mt_reachable_IPv6_prefx = -1; /* CLV 237 */ static gint ett_isis_lsp_clv_rt_capable_IPv4_prefx = -1; /* CLV 242 */ static gint ett_isis_lsp_clv_grp_address_IPv4_prefx = -1; /* CLV 142 */ static const value_string isis_lsp_istype_vals[] = { { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"}, { ISIS_LSP_TYPE_LEVEL_1, "Level 1"}, { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"}, { ISIS_LSP_TYPE_LEVEL_2, "Level 2"}, { 0, NULL } }; /* * Predclare dissectors for use in clv dissection. */ static void dissect_lsp_prefix_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_partition_dis_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_mt_is_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_ext_is_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_l2_is_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_l1_es_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_l1_is_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_area_address_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_isis_lsp_clv_mt_cap(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_ip_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_ipv6_int_addr_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_ip_int_addr_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_te_router_id_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_hostname_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_mt_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_nlpid_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_ipv6_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_ext_ip_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_ip_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_ipreach_subclv(tvbuff_t *tvb, proto_tree *tree, int offset, int clv_code, int clv_len); static void dissect_lsp_mt_reachable_IPv4_prefx_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_lsp_mt_reachable_IPv6_prefx_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_isis_rt_capable_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length); static void dissect_isis_grp_address_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length,int length); static void fp_get_hmac_addr (guint64 hmac, guint16 *swid, guint16 *sswid, guint16 *lid); static const isis_clv_handle_t clv_l1_lsp_opts[] = { { ISIS_CLV_AREA_ADDRESS, "Area address(es)", &ett_isis_lsp_clv_area_addr, dissect_lsp_area_address_clv }, { ISIS_CLV_IS_REACH, "IS Reachability", &ett_isis_lsp_clv_is_neighbors, dissect_lsp_l1_is_neighbors_clv }, { ISIS_CLV_ES_NEIGHBORS, "ES Neighbor(s)", &ett_isis_lsp_clv_is_neighbors, dissect_lsp_l1_es_neighbors_clv }, { ISIS_CLV_EXTD_IS_REACH, "Extended IS reachability", &ett_isis_lsp_clv_ext_is_reachability, dissect_lsp_ext_is_reachability_clv }, { ISIS_CLV_INT_IP_REACH, "IP Internal reachability", &ett_isis_lsp_clv_ip_reachability, dissect_lsp_ip_reachability_clv }, { ISIS_CLV_EXT_IP_REACH, "IP External reachability", &ett_isis_lsp_clv_ip_reachability, dissect_lsp_ip_reachability_clv }, { ISIS_CLV_EXTD_IP_REACH, "Extended IP Reachability", &ett_isis_lsp_clv_ext_ip_reachability, dissect_lsp_ext_ip_reachability_clv }, { ISIS_CLV_IP6_REACH, "IPv6 reachability", &ett_isis_lsp_clv_ipv6_reachability, dissect_lsp_ipv6_reachability_clv }, { ISIS_CLV_PROTOCOLS_SUPPORTED, "Protocols supported", &ett_isis_lsp_clv_nlpid, dissect_lsp_nlpid_clv }, { ISIS_CLV_HOSTNAME, "Hostname", &ett_isis_lsp_clv_hostname, dissect_lsp_hostname_clv }, { ISIS_CLV_TE_ROUTER_ID, "Traffic Engineering Router ID", &ett_isis_lsp_clv_te_router_id, dissect_lsp_te_router_id_clv }, { ISIS_CLV_IP_ADDR, "IP Interface address(es)", &ett_isis_lsp_clv_ipv4_int_addr, dissect_lsp_ip_int_addr_clv }, { ISIS_CLV_IP6_ADDR, "IPv6 Interface address(es)", &ett_isis_lsp_clv_ipv6_int_addr, dissect_lsp_ipv6_int_addr_clv }, { ISIS_CLV_MT_CAP, "MT-Capability", &ett_isis_lsp_clv_mt_cap, dissect_isis_lsp_clv_mt_cap }, { ISIS_CLV_AUTHENTICATION, "Authentication", &ett_isis_lsp_clv_authentication, dissect_lsp_authentication_clv }, { ISIS_CLV_IP_AUTHENTICATION, "IP Authentication", &ett_isis_lsp_clv_ip_authentication, dissect_lsp_ip_authentication_clv }, { ISIS_CLV_MT_SUPPORTED, "Multi Topology supported", &ett_isis_lsp_clv_mt, dissect_lsp_mt_clv }, { ISIS_CLV_MT_IS_REACH, "Multi Topology IS Reachability", &ett_isis_lsp_clv_mt_is, dissect_lsp_mt_is_reachability_clv }, { ISIS_CLV_MT_IP_REACH, "Multi Topology Reachable IPv4 Prefixes", &ett_isis_lsp_clv_mt_reachable_IPv4_prefx, dissect_lsp_mt_reachable_IPv4_prefx_clv }, { ISIS_CLV_MT_IP6_REACH, "Multi Topology Reachable IPv6 Prefixes", &ett_isis_lsp_clv_mt_reachable_IPv6_prefx, dissect_lsp_mt_reachable_IPv6_prefx_clv }, { ISIS_CLV_RT_CAPABLE, "Router Capability", &ett_isis_lsp_clv_rt_capable_IPv4_prefx, dissect_isis_rt_capable_clv }, { ISIS_GRP_ADDR, "GROUP ADDRESS TLV", &ett_isis_lsp_clv_grp_address_IPv4_prefx, dissect_isis_grp_address_clv }, { 0, "", NULL, NULL } }; static const isis_clv_handle_t clv_l2_lsp_opts[] = { { ISIS_CLV_AREA_ADDRESS, "Area address(es)", &ett_isis_lsp_clv_area_addr, dissect_lsp_area_address_clv }, { ISIS_CLV_IS_REACH, "IS Reachability", &ett_isis_lsp_clv_is_neighbors, dissect_lsp_l2_is_neighbors_clv }, { ISIS_CLV_EXTD_IS_REACH, "Extended IS reachability", &ett_isis_lsp_clv_ext_is_reachability, dissect_lsp_ext_is_reachability_clv }, { ISIS_CLV_PARTITION_DIS, "Partition Designated Level 2 IS", &ett_isis_lsp_clv_partition_dis, dissect_lsp_partition_dis_clv }, { ISIS_CLV_PREFIX_NEIGHBORS, "Prefix neighbors", &ett_isis_lsp_clv_prefix_neighbors, dissect_lsp_prefix_neighbors_clv }, { ISIS_CLV_INT_IP_REACH, "IP Internal reachability", &ett_isis_lsp_clv_ip_reachability, dissect_lsp_ip_reachability_clv }, { ISIS_CLV_EXT_IP_REACH, "IP External reachability", &ett_isis_lsp_clv_ip_reachability, dissect_lsp_ip_reachability_clv }, { ISIS_CLV_PROTOCOLS_SUPPORTED, "Protocols supported", &ett_isis_lsp_clv_nlpid, dissect_lsp_nlpid_clv }, { ISIS_CLV_HOSTNAME, "Hostname", &ett_isis_lsp_clv_hostname, dissect_lsp_hostname_clv }, { ISIS_CLV_TE_ROUTER_ID, "Traffic Engineering Router ID", &ett_isis_lsp_clv_te_router_id, dissect_lsp_te_router_id_clv }, { ISIS_CLV_EXTD_IP_REACH, "Extended IP Reachability", &ett_isis_lsp_clv_ext_ip_reachability, dissect_lsp_ext_ip_reachability_clv }, { ISIS_CLV_IP6_REACH, "IPv6 reachability", &ett_isis_lsp_clv_ipv6_reachability, dissect_lsp_ipv6_reachability_clv }, { ISIS_CLV_IP_ADDR, "IP Interface address(es)", &ett_isis_lsp_clv_ipv4_int_addr, dissect_lsp_ip_int_addr_clv }, { ISIS_CLV_IP6_ADDR, "IPv6 Interface address(es)", &ett_isis_lsp_clv_ipv6_int_addr, dissect_lsp_ipv6_int_addr_clv }, { ISIS_CLV_MT_CAP, "MT-Capability", &ett_isis_lsp_clv_mt_cap, dissect_isis_lsp_clv_mt_cap }, { ISIS_CLV_AUTHENTICATION, "Authentication", &ett_isis_lsp_clv_authentication, dissect_lsp_authentication_clv }, { ISIS_CLV_IP_AUTHENTICATION, "IP Authentication", &ett_isis_lsp_clv_ip_authentication, dissect_lsp_ip_authentication_clv }, { ISIS_CLV_MT_SUPPORTED, "Multi Topology", &ett_isis_lsp_clv_mt, dissect_lsp_mt_clv }, { ISIS_CLV_MT_IS_REACH, "Multi Topology IS Reachability", &ett_isis_lsp_clv_mt_is, dissect_lsp_mt_is_reachability_clv }, { ISIS_CLV_MT_IP_REACH, "Multi Topology Reachable IPv4 Prefixes", &ett_isis_lsp_clv_mt_reachable_IPv4_prefx, dissect_lsp_mt_reachable_IPv4_prefx_clv }, { ISIS_CLV_MT_IP6_REACH, "Multi Topology Reachable IPv6 Prefixes", &ett_isis_lsp_clv_mt_reachable_IPv6_prefx, dissect_lsp_mt_reachable_IPv6_prefx_clv }, { 0, "", NULL, NULL } }; static void fp_get_hmac_addr (guint64 hmac, guint16 *swid, guint16 *sswid, guint16 *lid) { if (!swid || !sswid || !lid) { return; } *swid = (guint16) ((hmac & FP_HMAC_SWID_MASK) >> 32); *sswid = (guint16) ((hmac & FP_HMAC_SSWID_MASK) >> 16); *lid = (guint16) (hmac & FP_HMAC_LID_MASK); } /* * Name: dissect_lsp_mt_id() * * Description: * dissect and display the multi-topology ID value * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. CAN'T BE NULL * int : offset into packet data where we are. * * Output: * void, but we will add to proto tree. */ static void dissect_lsp_mt_id(tvbuff_t *tvb, proto_tree *tree, int offset) { int mt_block, mt_id; const char *mt_desc=""; /* fetch two bytes */ mt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text ( tree, tvb, offset, 1 , "4 most significant bits reserved, should be set to 0 (%d)", ISIS_LSP_MT_MSHIP_RES(mt_block)); mt_id = ISIS_LSP_MT_MSHIP_ID(mt_block); /*mask out the lower 12 bits */ switch(mt_id) { case 0: mt_desc="'standard' topology"; break; case 1: mt_desc="IPv4 In-Band Management purposes"; break; case 2: mt_desc="IPv6 routing topology"; break; case 3: mt_desc="IPv4 multicast routing topology"; break; case 4: mt_desc="IPv6 multicast routing topology"; break; default: mt_desc=((mt_block & 0x0fff) < 3996) ? "Reserved for IETF Consensus" : "Development, Experimental and Proprietary features"; } proto_tree_add_text ( tree, tvb, offset, 2 , "%s (%d)", mt_desc, mt_id); } /* * Name: dissect_metric() * * Description: * Display a metric prefix portion. ISIS has the concept of multple * metric per prefix (default, delay, expense, and error). This * routine assists other dissectors by adding a single one of * these to the display tree.. * * The 8th(msbit) bit in the metric octet is the "supported" bit. The * "default" support is required, so we support a "force_supported" * flag that tells us that it MUST be zero (zero==supported, * so it really should be a "not supported" in the boolean sense) * and to display a protocol failure accordingly. Notably, * Cisco IOS 12(6) blows this! * The 7th bit must be zero (reserved). * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. May be NULL * int : offset into packet data where we are. * guint8 : value of the metric. * char * : string giving type of the metric. * int : force supported. True is the supported bit MUST be zero. * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_metric(tvbuff_t *tvb, proto_tree *tree, int offset, guint8 value, const char *pstr, int force_supported ) { int s; if ( !tree ) return; s = ISIS_LSP_CLV_METRIC_SUPPORTED(value); proto_tree_add_text(tree, tvb, offset, 1, "%s Metric: %s%s %s%d:%d", pstr, s ? "Not supported" : "Supported", (s && force_supported) ? "(but is required to be)":"", ISIS_LSP_CLV_METRIC_RESERVED(value) ? "(reserved bit != 0)":"", ISIS_LSP_CLV_METRIC_VALUE(value), value ); } /* * Name: dissect_lsp_ip_reachability_clv() * * Description: * Decode an IP reachability CLV. This can be either internal or * external (the clv format does not change and which type we are * displaying is put there by the dispatcher). All of these * are a metric block followed by an IP addr and mask. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_ip_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { proto_item *ti; proto_tree *ntree = NULL; guint32 src, mask, bitmask; int prefix_len; gboolean found_mask = FALSE; while ( length > 0 ) { if (length<12) { isis_dissect_unknown(tvb, tree, offset, "short IP reachability (%d vs 12)", length ); return; } /* * Gotta build a sub-tree for all our pieces */ if ( tree ) { src = tvb_get_ipv4(tvb, offset+4); mask = tvb_get_ntohl(tvb, offset+8); /* find out if the mask matches one of 33 possible prefix lengths */ bitmask = 0xffffffff; for(prefix_len = 32; prefix_len >= 0; prefix_len--) { if (bitmask==mask) { found_mask = TRUE; break; } bitmask = bitmask << 1; } /* If we have a discontiguous netmask, dump the mask, otherwise print the prefix_len */ /* XXX - We should probably have some sort of netmask_to_str() routine in to_str.c that does this. */ if(found_mask) { ti = proto_tree_add_text ( tree, tvb, offset, 12, "IPv4 prefix: %s/%d", ip_to_str((guint8*)&src), prefix_len ); } else { ti = proto_tree_add_text ( tree, tvb, offset, 12, "IPv4 prefix: %s mask %s", ip_to_str((guint8*)&src), tvb_ip_to_str(tvb, offset+8)); }; ntree = proto_item_add_subtree(ti, ett_isis_lsp_clv_ip_reachability); proto_tree_add_text (ntree, tvb, offset, 1, "Default Metric: %d, %s, Distribution: %s", ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset)), ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset)) ? "External" : "Internal", ISIS_LSP_CLV_METRIC_UPDOWN(tvb_get_guint8(tvb, offset)) ? "down" : "up"); if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+1))) { proto_tree_add_text (ntree, tvb, offset+1, 1, "Delay Metric: Not supported"); } else { proto_tree_add_text (ntree, tvb, offset+1, 1, "Delay Metric: %d, %s", ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+1)), ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+1)) ? "External" : "Internal"); } if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+2))) { proto_tree_add_text (ntree, tvb, offset+2, 1, "Expense Metric: Not supported"); } else { proto_tree_add_text (ntree, tvb, offset+2, 1, "Expense Metric: %d, %s", ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+2)), ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+2)) ? "External" : "Internal"); } if (ISIS_LSP_CLV_METRIC_SUPPORTED(tvb_get_guint8(tvb, offset+3))) { proto_tree_add_text (ntree, tvb, offset+3, 1, "Error Metric: Not supported"); } else { proto_tree_add_text (ntree, tvb, offset+3, 1, "Error Metric: %d, %s", ISIS_LSP_CLV_METRIC_VALUE(tvb_get_guint8(tvb, offset+3)), ISIS_LSP_CLV_METRIC_IE(tvb_get_guint8(tvb, offset+3)) ? "External" : "Internal"); } } offset += 12; length -= 12; } } /* * Name: dissect_ipreach_subclv () * * Description: parses IP reach subTLVs * Called by various IP Reachability dissectors. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. * int : offset into packet data where we are (beginning of the sub_clv value). * * Output: * void */ static void dissect_ipreach_subclv(tvbuff_t *tvb, proto_tree *tree, int offset, int clv_code, int clv_len) { switch (clv_code) { case 1: while (clv_len >= 4) { proto_tree_add_text(tree, tvb, offset, 4, "32-Bit Administrative tag: 0x%08x (=%u)", tvb_get_ntohl(tvb, offset), tvb_get_ntohl(tvb, offset)); offset+=4; clv_len-=4; } break; case 2: while (clv_len >= 8) { proto_tree_add_text(tree, tvb, offset, 8, "64-Bit Administrative tag: 0x%08x%08x", tvb_get_ntohl(tvb, offset), tvb_get_ntohl(tvb, offset+4)); offset+=8; clv_len-=8; } break; default : proto_tree_add_text (tree, tvb, offset, clv_len+2, "Unknown sub-TLV: code %u, length %u", clv_code, clv_len ); break; } } /* * Name: dissect_lsp_ext_ip_reachability_clv() * * Description: Decode an Extended IP Reachability CLV - code 135. * * The extended IP reachability TLV is an extended version * of the IP reachability TLVs (codes 128 and 130). It encodes * the metric as a 32-bit unsigned interger and allows to add * sub-CLV(s). * * CALLED BY TLV 235 DISSECTOR * * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_ext_ip_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { proto_item *pi = NULL; proto_tree *subtree = NULL; proto_tree *subtree2 = NULL; guint8 ctrl_info; guint bit_length; int byte_length; guint8 prefix [4]; guint32 metric; guint len,i; guint subclvs_len; guint clv_code, clv_len; if (!tree) return; while (length > 0) { ctrl_info = tvb_get_guint8(tvb, offset+4); bit_length = ctrl_info & 0x3f; byte_length = ipv4_addr_and_mask(tvb, offset+5, prefix, bit_length); if (byte_length == -1) { isis_dissect_unknown(tvb, tree, offset, "IPv4 prefix has an invalid length: %d bits", bit_length ); return; } metric = tvb_get_ntohl(tvb, offset); subclvs_len = 0; if ((ctrl_info & 0x40) != 0) subclvs_len = 1+tvb_get_guint8(tvb, offset+5+byte_length); pi = proto_tree_add_text (tree, tvb, offset, 5+byte_length+subclvs_len, "IPv4 prefix: %s/%d, Metric: %u, Distribution: %s, %ssub-TLVs present", ip_to_str (prefix), bit_length, metric, ((ctrl_info & 0x80) == 0) ? "up" : "down", ((ctrl_info & 0x40) == 0) ? "no " : "" ); /* open up a new tree per prefix */ subtree = proto_item_add_subtree (pi, ett_isis_lsp_part_of_clv_ext_ip_reachability); proto_tree_add_text (subtree, tvb, offset+5, byte_length, "IPv4 prefix: %s/%u", ip_to_str (prefix), bit_length); proto_tree_add_text (subtree, tvb, offset, 4, "Metric: %u", metric); proto_tree_add_text (subtree, tvb, offset+4, 1, "Distribution: %s", ((ctrl_info & 0x80) == 0) ? "up" : "down"); len = 5 + byte_length; if ((ctrl_info & 0x40) != 0) { subclvs_len = tvb_get_guint8(tvb, offset+len); pi = proto_tree_add_text (subtree, tvb, offset+len, 1, "sub-TLVs present, total length: %u bytes", subclvs_len); proto_item_set_len (pi, subclvs_len+1); /* open up a new tree for the subTLVs */ subtree2 = proto_item_add_subtree (pi, ett_isis_lsp_clv_ip_reach_subclv); i =0; while (i < subclvs_len) { clv_code = tvb_get_guint8(tvb, offset+len+1); /* skip the total subtlv len indicator */ clv_len = tvb_get_guint8(tvb, offset+len+2); /* * we pass on now the raw data to the ipreach_subtlv dissector * therefore we need to skip 3 bytes * (total subtlv len, subtlv type, subtlv len) */ dissect_ipreach_subclv(tvb, subtree2, offset+len+3, clv_code, clv_len); i += clv_len + 2; } len += 1 + subclvs_len; } else { proto_tree_add_text (subtree, tvb, offset+4, 1, "no sub-TLVs present"); proto_item_set_len (pi, len); } offset += len; length -= len; } } /* * Name: dissect_isis_grp_address_clv() * * Description: Decode GROUP ADDRESS subTLVs * The Group Address TLV is composed of 1 octet for the type, * 1 octet that specifies the number of bytes in the value field, and a * Variable length value field that can have any or all of the subTLVs that are listed in the * - below section * *Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_isis_grp_address_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int tree_id,int length) { gint len; gint record_num; gint source_num; gint k=1; guint16 mt_block; guint64 hmac_src; guint16 swid = 0; guint16 sswid = 0; guint16 lid = 0; proto_item *ti=NULL; proto_tree *rt_tree=NULL; const char *mt_desc; while (length>0) { /* fetch two bytes */ mt_block=tvb_get_ntohs(tvb, offset); /* Mask out the lower 8 bits */ switch((mt_block&0xff00)>>8) { case GRP_MAC_ADDRESS: mt_desc="GROUP MAC ADDRESS"; ti = proto_tree_add_text (tree, tvb, offset,(mt_block&0x00ff)+2 , "%s SUB TLV", mt_desc); rt_tree = proto_item_add_subtree(ti,ett_isis_lsp_clv_grp_address_IPv4_prefx); length=length-1; offset=offset+1; len=tvb_get_guint8(tvb, offset);/* 1 byte fetched displays the length*/ proto_tree_add_text (rt_tree, tvb, offset,1," Length :%d ",len); if(len < 5) { length=length-len; offset=offset+len; break; } length=length-1; offset=offset+1; mt_block=tvb_get_ntohs(tvb, offset);/* Fetch the data in the next two bytes for display*/ proto_tree_add_text (rt_tree, tvb, offset,2," Topology ID:%d ",(mt_block&0x0fff) ); length=length-2; offset=offset+2; len=len-2; mt_block=tvb_get_ntohs(tvb, offset);/* Fetch the data in the next two bytes for display*/ proto_tree_add_text (rt_tree,tvb, offset,2," VLAN ID:%d ",(mt_block&0x0fff) ); length=length-2; offset=offset+2; len=len-2; record_num=tvb_get_guint8(tvb, offset);/* 1 byte fetched displays the length*/ proto_tree_add_text (rt_tree,tvb, offset,1, " Number of records :%d ",record_num); length=length-1; offset=offset+1; len=len-1; while(len > 0) { source_num=tvb_get_guint8(tvb, offset); proto_tree_add_text (rt_tree,tvb, offset,1," Number of sources :%d ",source_num); length=length-1; offset=offset+1; len=len-1; hmac_src=tvb_get_ntoh48(tvb, offset);/* Fetch the data in the next two bytes for display*/ fp_get_hmac_addr (hmac_src, &swid, &sswid, &lid); proto_tree_add_text (rt_tree,tvb, offset,6," Group Address:%04x.%04x.%04x ",swid, sswid, lid ); length=length-6; offset=offset+6; len=len-6; while((len > 0) && (source_num > 0)) { hmac_src = tvb_get_ntoh48 (tvb, offset); fp_get_hmac_addr (hmac_src, &swid, &sswid, &lid); proto_tree_add_text (rt_tree,tvb, offset,6," Source Address (%d):%04x.%04x.%04x",k,swid, sswid, lid); k=k+1; length=length-6; offset=offset+6; len=len-6; source_num--; } } break; default: mt_desc="INVALID"; proto_tree_add_uint_format ( tree, tree_id, tvb, offset,(mt_block&0x00ff)+2, mt_block, "%s SUB TLV",mt_desc ); offset=offset+1; length=length-2-(tvb_get_guint8(tvb, offset)); offset=offset+1+(tvb_get_guint8(tvb, offset)); break; } } } /* * Name: dissect_isis_rt_capable_clv() * * Description: Decode RouterCapability subTLVs * * The Router Capability TLV is composed of 1 octet for the type, * 1 octet that specifies the number of bytes in the value field, and a * variable length value field that can have any or all of the subTLVs * that are listed in the below section * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * len : local variable described to handle the length of the subTLV * * Output: * void, will modify proto_tree if not null. */ /* As per RFC 6326 section 2.3 */ static void dissect_isis_rt_capable_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { gint len; guint16 rt_block; guint32 rt_block1; proto_item *ti; proto_tree *rt_tree; const char *mt_desc; gint root_id = 1; /* To display the root id */ gint sec_vlan_id = 1; /* To display the seconadary VLAN id */ length = length - 5; /* Ignoring the 5 reserved bytes */ offset = offset + 5; while (length>1) { /* fetch two bytes */ rt_block = tvb_get_ntohs(tvb, offset); /* Mask out the lower 8 bits */ switch ((rt_block&0xff00)>>8) { case TRILL_VERSION: mt_desc = "TRILL version"; ti = proto_tree_add_text(tree, tvb, offset, (rt_block&0x00ff)+2, "%s sub tlv", mt_desc); rt_tree = proto_item_add_subtree(ti, ett_isis_lsp_clv_rt_capable_IPv4_prefx); length = length-1; offset = offset+1; len = tvb_get_guint8(tvb, offset); /* 1 byte fetched displays the length */ proto_tree_add_text(rt_tree, tvb, offset, 1, "Length: %d", len); rt_block = tvb_get_ntohs(tvb, offset); /* Fetch the data in the next two bytes for display */ proto_tree_add_text(rt_tree, tvb, offset+1, 1, "Maximum version: %d", (rt_block&0x00ff)); length = length-2; offset = offset+2; break; case TREES: mt_desc = "Trees"; ti = proto_tree_add_text(tree, tvb, offset, (rt_block&0x00ff)+2, "%s sub tlv", mt_desc); rt_tree = proto_item_add_subtree(ti, ett_isis_lsp_clv_rt_capable_IPv4_prefx); length = length-1; offset = offset+1; len = tvb_get_guint8(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 1, "Length: %d", len); length = length-1; offset = offset+1; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Nof. trees to compute: %d", rt_block); length = length-2; offset = offset+2; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Maximum nof. trees to compute: %d", rt_block); length = length-2; offset = offset+2; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Nof. trees to use: %d", rt_block); length = length-2; offset = offset+2; break; case TREE_IDENTIFIER: mt_desc = "Tree root identifier"; ti=proto_tree_add_text(tree, tvb, offset, (rt_block&0x00ff)+2, "%s sub tlv", mt_desc); rt_tree = proto_item_add_subtree(ti, ett_isis_lsp_clv_rt_capable_IPv4_prefx); length = length-1; offset = offset+1; len = tvb_get_guint8(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 1, "Length: %d", len); rt_block = tvb_get_ntohs(tvb, offset+1); proto_tree_add_text(rt_tree, tvb, offset+1, 2, "Starting tree no: %d", rt_block); len = len-2; length = length-2; offset = offset+3; while (len>1) { rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Nickname(%dth root): %d", root_id, rt_block); root_id = root_id+1; len = len-2; length = length-2; offset = offset+2; } break; case NICKNAME: mt_desc = "The nickname"; ti=proto_tree_add_text(tree, tvb, offset, (rt_block&0x00ff)+2, "%s sub tlv", mt_desc); rt_tree = proto_item_add_subtree(ti, ett_isis_lsp_clv_rt_capable_IPv4_prefx); length = length-1; offset = offset+1; len = tvb_get_guint8(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 1, "Length: %d", len); length = length-1; offset = offset+1; while (len>0) { rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 1, "Nickname priority: %d", ((rt_block&0xff00)>>8)); length = length-1; offset = offset+1; len = len-1; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Tree root priority: %d", rt_block); length = length-2; offset = offset+2; len = len-2; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Nickname: %x", rt_block); length = length-2; offset = offset+2; len = len-2; } break; case INTERESTED_VLANS: mt_desc = "Interested VLAN and spanning tree root"; ti = proto_tree_add_text(tree, tvb, offset, (rt_block&0x00ff)+2, "%s sub tlv", mt_desc); rt_tree = proto_item_add_subtree(ti, ett_isis_lsp_clv_rt_capable_IPv4_prefx); length = length-1; offset = offset+1; len = tvb_get_guint8(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 1, "Length: %d", len); length = length-1; offset = offset+1; len = len-1; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Nickname: %x", rt_block); length = length-2; offset = offset+2; len = len-2; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "%s%s", (rt_block&0x8000) ? "IPv4 multicast router set, " : "IPv4 multicast router not set, ", (rt_block&0x4000) ? "IPv6 multicast router set" : "IPv6 multicast router not set"); proto_tree_add_text(rt_tree, tvb, offset, 2, "Vlan start id: %x", (rt_block&0x0fff)); length = length-2; offset = offset+2; len = len-2; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Vlan end id: %x", (rt_block&0x0fff)); length = length-2; offset = offset+2; len = len-2; rt_block1 = tvb_get_ntohl(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 4, "Appointed forward state lost counter: %d", rt_block1); length = length-4; offset = offset+4; len = len-4; while (len>0) { proto_tree_add_item(rt_tree, hf_isis_lsp_root_id, tvb, offset, 6, ENC_BIG_ENDIAN); length = length-6; offset = offset+6; len = len-6; length = length-2; } break; case TREES_USED_IDENTIFIER: mt_desc = "Trees used identifier"; ti=proto_tree_add_text(tree, tvb, offset, (rt_block&0x00ff)+2, "%s sub tlv", mt_desc); rt_tree = proto_item_add_subtree(ti, ett_isis_lsp_clv_rt_capable_IPv4_prefx); length = length-1; offset = offset+1; len = tvb_get_guint8(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 1, "Length: %d", len); rt_block = tvb_get_ntohs(tvb, offset+1); proto_tree_add_text(rt_tree, tvb, offset+1, 2, "Starting tree no: %d", rt_block); len = len-2; length = length-2; offset = offset+3; root_id = 1; while (len>0) { rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset,2,"Nickname(%dth root): %d", root_id, rt_block); root_id = root_id+1; len = len-2; offset = offset+2; length = length-2; } break; case VLAN_GROUP: mt_desc = "The VLAN group"; ti = proto_tree_add_text(tree, tvb, offset, (rt_block&0x00ff)+2, "%s sub tlv", mt_desc); rt_tree = proto_item_add_subtree(ti, ett_isis_lsp_clv_rt_capable_IPv4_prefx); length = length-1; offset = offset+1; len = tvb_get_guint8(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 1, "Length: %d", len); len = len-1; length = length-1; offset = offset+1; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Primary vlan id: %d", (rt_block&0x0fff)); length = length-2; offset = offset+2; len = len-2; rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "Secondary vlan id: %d", (rt_block&0x0fff)); length = length-2; offset = offset+2; len = len-2; sec_vlan_id = 1; while (len>0) { rt_block = tvb_get_ntohs(tvb, offset); proto_tree_add_text(rt_tree, tvb, offset, 2, "%dth secondary vlan id: %x", sec_vlan_id, rt_block); length = length-2; offset = offset+2; sec_vlan_id = sec_vlan_id+1; len = len-2; } break; default: mt_desc = "INVALID"; proto_tree_add_text(tree, tvb, offset, (rt_block&0x00ff)+2, "%s sub tlv", mt_desc); offset = offset+1; length = length-2-(tvb_get_guint8(tvb, offset)); offset = offset+1+(tvb_get_guint8(tvb, offset)); break; } } } /* * Name: dissect_lsp_ipv6_reachability_clv() * * Description: Decode an IPv6 reachability CLV - code 236. * * CALLED BY TLV 237 DISSECTOR * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_ipv6_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { proto_item *pi; proto_tree *subtree = NULL; proto_tree *subtree2 = NULL; guint8 ctrl_info; guint bit_length; int byte_length; struct e_in6_addr prefix; guint32 metric; guint len,i; guint subclvs_len; guint clv_code, clv_len; if (!tree) return; while (length > 0) { ctrl_info = tvb_get_guint8(tvb, offset+4); bit_length = tvb_get_guint8(tvb, offset+5); byte_length = ipv6_addr_and_mask(tvb, offset+6, &prefix, bit_length); if (byte_length == -1) { isis_dissect_unknown(tvb, tree, offset, "IPv6 prefix has an invalid length: %d bits", bit_length ); return; } metric = tvb_get_ntohl(tvb, offset); subclvs_len = 0; if ((ctrl_info & 0x20) != 0) subclvs_len = 1+tvb_get_guint8(tvb, offset+6+byte_length); pi = proto_tree_add_text (tree, tvb, offset, 6+byte_length+subclvs_len, "IPv6 prefix: %s/%u, Metric: %u, Distribution: %s, %s, %ssub-TLVs present", ip6_to_str (&prefix), bit_length, metric, ((ctrl_info & 0x80) == 0) ? "up" : "down", ((ctrl_info & 0x40) == 0) ? "internal" : "external", ((ctrl_info & 0x20) == 0) ? "no " : "" ); subtree = proto_item_add_subtree (pi, ett_isis_lsp_part_of_clv_ipv6_reachability); proto_tree_add_text (subtree, tvb, offset+6, byte_length, "IPv6 prefix: %s/%u", ip6_to_str (&prefix), bit_length); proto_tree_add_text (subtree, tvb, offset, 4, "Metric: %u", metric); proto_tree_add_text (subtree, tvb, offset+4, 1, "Distribution: %s, %s", ((ctrl_info & 0x80) == 0) ? "up" : "down", ((ctrl_info & 0x40) == 0) ? "internal" : "external" ); if ((ctrl_info & 0x1f) != 0) { proto_tree_add_text (subtree, tvb, offset+4, 1, "Reserved bits: 0x%x", (ctrl_info & 0x1f) ); } len = 6 + byte_length; if ((ctrl_info & 0x20) != 0) { subclvs_len = tvb_get_guint8(tvb, offset+len); pi = proto_tree_add_text (subtree, tvb, offset+len, 1, "sub-TLVs present, total length: %u bytes", subclvs_len); proto_item_set_len (pi, subclvs_len+1); /* open up a new tree for the subTLVs */ subtree2 = proto_item_add_subtree (pi, ett_isis_lsp_clv_ip_reach_subclv); i =0; while (i < subclvs_len) { clv_code = tvb_get_guint8(tvb, offset+len+1); /* skip the total subtlv len indicator */ clv_len = tvb_get_guint8(tvb, offset+len+2); dissect_ipreach_subclv(tvb, subtree2, offset+len+3, clv_code, clv_len); i += clv_len + 2; } len += 1 + subclvs_len; } else { proto_tree_add_text (subtree, tvb, offset+4, 1, "no sub-TLVs present"); proto_item_set_len (pi, len); } offset += len; length -= len; } } /* * Name: dissect_lsp_nlpid_clv() * * Description: * Decode for a lsp packets NLPID clv. Calls into the * clv common one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_nlpid_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_nlpid_clv(tvb, tree, offset, length); } /* * Name: dissect_lsp_mt_clv() * * Description: - code 229 * Decode for a lsp packets Multi Topology clv. Calls into the * clv common one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * guint : length of this clv * int : length of IDs in packet. * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_mt_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_mt_clv(tvb, tree, offset, length, hf_isis_lsp_clv_mt ); } /* * Name: dissect_lsp_hostname_clv() * * Description: * Decode for a lsp packets hostname clv. Calls into the * clv common one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_hostname_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_hostname_clv(tvb, tree, offset, length, hf_isis_lsp_hostname); } /* * Name: dissect_lsp_te_router_id_clv() * * Description: * Decode for a lsp packets Traffic Engineering ID clv. Calls into the * clv common one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_te_router_id_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_te_router_id_clv(tvb, tree, offset, length, hf_isis_lsp_clv_te_router_id ); } /* * Name: dissect_lsp_ip_int_addr_clv() * * Description: * Decode for a lsp packets ip interface addr clv. Calls into the * clv common one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_ip_int_addr_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_ip_int_clv(tvb, tree, offset, length, hf_isis_lsp_clv_ipv4_int_addr ); } /* * Name: dissect_lsp_ipv6_int_addr_clv() * * Description: Decode an IPv6 interface addr CLV - code 232. * * Calls into the clv common one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_ipv6_int_addr_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_ipv6_int_clv(tvb, tree, offset, length, hf_isis_lsp_clv_ipv6_int_addr ); } static void dissect_isis_lsp_clv_mt_cap_spb_instance(tvbuff_t *tvb, proto_tree *tree, int offset, int subtype, int sublen) { const int CIST_ROOT_ID_LEN = 8; /* CIST Root Identifier */ const int CIST_EXT_ROOT_PATH_COST_LEN = 4; /* CIST External Root Path Cost */ const int BRIDGE_PRI_LEN = 2; /* Bridge Priority */ const int V_SPSOURCEID_LEN = 4; /* v | SPSourceID */ const int NUM_TREES_LEN = 1; /* num of trees */ const int CIST_ROOT_ID_OFFSET = 0; const int CIST_EXT_ROOT_PATH_COST_OFFSET = CIST_ROOT_ID_OFFSET + CIST_ROOT_ID_LEN; const int BRIDGE_PRI_OFFSET = CIST_EXT_ROOT_PATH_COST_OFFSET + CIST_EXT_ROOT_PATH_COST_LEN; const int V_SPSOURCEID_OFFSET = BRIDGE_PRI_OFFSET + BRIDGE_PRI_LEN; const int NUM_TREES_OFFSET = V_SPSOURCEID_OFFSET + V_SPSOURCEID_LEN; const int FIXED_LEN = NUM_TREES_OFFSET + NUM_TREES_LEN; const int VLAN_ID_TUPLE_LEN = 8; if (sublen < FIXED_LEN) { isis_dissect_unknown( tvb, tree, offset, "Short SPB Digest subTLV (%d vs %d)", sublen, FIXED_LEN); return; } else { proto_tree *subtree, *ti; int subofs = offset; const guint8 *cist_root_identifier = tvb_get_ptr (tvb, subofs + CIST_ROOT_ID_OFFSET, CIST_ROOT_ID_LEN); const guint32 cist_root_path_cost = tvb_get_ntohl (tvb, subofs + CIST_EXT_ROOT_PATH_COST_OFFSET); const guint16 bridge_priority = tvb_get_ntohs (tvb, subofs + BRIDGE_PRI_OFFSET); const guint32 v_spsourceid = tvb_get_ntohl (tvb, subofs + V_SPSOURCEID_OFFSET); guint8 num_trees = tvb_get_guint8(tvb, subofs + NUM_TREES_OFFSET); /*************************/ ti = proto_tree_add_text( tree, tvb, offset-2, sublen+2, "SPB Instance: Type: 0x%02x, Length: %d", subtype, sublen); subtree = proto_item_add_subtree(ti, ett_isis_lsp_clv_mt_cap_spb_instance); /*************************/ proto_tree_add_text( subtree, tvb, subofs + CIST_ROOT_ID_OFFSET, CIST_ROOT_ID_LEN, "CIST Root Identifier: %08x-%08x-%08x-%08x-%08x-%08x-%08x-%08x", cist_root_identifier[0], cist_root_identifier[1], cist_root_identifier[2], cist_root_identifier[3], cist_root_identifier[4], cist_root_identifier[5], cist_root_identifier[6], cist_root_identifier[7]); proto_tree_add_text( subtree, tvb, subofs + CIST_EXT_ROOT_PATH_COST_OFFSET, CIST_EXT_ROOT_PATH_COST_LEN, "CIST External Root Path Cost: 0x%08x (%u)", cist_root_path_cost, cist_root_path_cost); proto_tree_add_text( subtree, tvb, subofs + BRIDGE_PRI_OFFSET, BRIDGE_PRI_LEN, "Bridge Priority: 0x%04x (%u)", bridge_priority, bridge_priority); proto_tree_add_text( subtree, tvb, subofs + V_SPSOURCEID_OFFSET, V_SPSOURCEID_LEN, "V: %u, SPSourceId: 0x%05x (%u)", (v_spsourceid & (1 << 20)) ? 1 : 0, v_spsourceid & 0xfffff, v_spsourceid & 0xfffff); proto_tree_add_text( subtree, tvb, subofs + NUM_TREES_OFFSET, NUM_TREES_LEN, "Number of Trees: 0x%02x (%u)%s", num_trees, num_trees, num_trees ? "" : " Invalid subTLV: zero trees"); subofs += FIXED_LEN; sublen -= FIXED_LEN; /*************************/ if (sublen != (num_trees * VLAN_ID_TUPLE_LEN)) { proto_tree_add_text( subtree, tvb, subofs, 0, "SubTLV length doesn't match number of trees"); return; } while (sublen > 0 && num_trees > 0) { if (sublen < VLAN_ID_TUPLE_LEN) { isis_dissect_unknown( tvb, subtree, offset, "Short VLAN_ID entry (%d vs %d)", sublen, VLAN_ID_TUPLE_LEN); return; } else { const guint8 flags = tvb_get_guint8(tvb, subofs); const guint8 *ect_id = tvb_get_ptr(tvb, subofs + 1, 4); const guint8 *bvid_spvid = tvb_get_ptr(tvb, subofs + 1 + 4, 3); const guint16 bvid = (0xff0 & (((guint16)bvid_spvid[0]) << 4)) | (0x0f & (bvid_spvid[1] >> 4)); const guint16 spvid = (0xf00 & (((guint16)bvid_spvid[1]) << 8)) | (0xff & (bvid_spvid[2])); proto_tree_add_text( subtree, tvb, subofs, VLAN_ID_TUPLE_LEN, " U: %u, M: %u, A: %u, ECT: %02x-%02x-%02x-%02x, BVID: 0x%03x (%d),%s SPVID: 0x%03x (%d)", (flags >> 7) & 1, (flags >> 6) & 1, (flags >> 5) & 1, ect_id[0], ect_id[1], ect_id[2], ect_id[3], bvid, bvid, ( bvid < 10 ? " " : bvid < 100 ? " " : bvid < 1000 ? " " : ""), spvid, spvid); subofs += VLAN_ID_TUPLE_LEN; sublen -= VLAN_ID_TUPLE_LEN; --num_trees; } } if (num_trees) { isis_dissect_unknown( tvb, subtree, offset, "Short subTLV (%d vs %d)", sublen, num_trees * VLAN_ID_TUPLE_LEN); return; } } } static void dissect_isis_lsp_clv_mt_cap_spb_oalg(tvbuff_t *tvb, proto_tree *tree, int offset, int subtype, int sublen) { isis_dissect_unknown( tvb, tree, offset, "MT-Cap SPB Opaque Algorithm: Type: 0x%02x, Length: %d", subtype, sublen); } static void dissect_isis_lsp_clv_mt_cap_spbm_service_identifier(tvbuff_t *tvb, proto_tree *tree, int offset, int subtype, int sublen) { const int BMAC_LEN = 6; /* B-MAC Address */ const int BVID_LEN = 2; /* Base-VID */ const int BMAC_OFFSET = 0; const int BVID_OFFSET = BMAC_OFFSET + BMAC_LEN; const int FIXED_LEN = BVID_OFFSET + BVID_LEN; const int ISID_LEN = 4; if (sublen < FIXED_LEN) { isis_dissect_unknown( tvb, tree, offset, "Short SPBM Service Identifier and Unicast Address subTLV (%d vs %d)", sublen, FIXED_LEN); return; } else { proto_tree *subtree, *ti; int subofs = offset; const guint8 *bmac = tvb_get_ptr (tvb, subofs + BMAC_OFFSET, BMAC_LEN); const guint16 bvid = tvb_get_ntohs(tvb, subofs + BVID_OFFSET); /*************************/ ti = proto_tree_add_text( tree, tvb, offset-2, sublen+2, "SPB Service ID and Unicast Address: Type: 0x%02x, Length: %d", subtype, sublen); subtree = proto_item_add_subtree(ti, ett_isis_lsp_clv_mt_cap_spbm_service_identifier); /*************************/ proto_tree_add_text( subtree, tvb, subofs + BMAC_OFFSET, BMAC_LEN, "B-MAC: %02x-%02x-%02x-%02x-%02x-%02x", bmac[0], bmac[1], bmac[2], bmac[3], bmac[4], bmac[5]); proto_tree_add_text( subtree, tvb, subofs + BVID_OFFSET, BVID_LEN, "Base-VID: 0x%03x (%u)", bvid, bvid); subofs += FIXED_LEN; sublen -= FIXED_LEN; /*************************/ while (sublen > 0) { if (sublen < ISID_LEN) { isis_dissect_unknown( tvb, subtree, offset, "Short ISID entry (%d vs %d)", sublen, ISID_LEN); return; } else { const guint32 isid = tvb_get_ntohl(tvb, subofs); proto_tree_add_text( subtree, tvb, subofs, ISID_LEN, " T: %u, R: %u, ISID: 0x%06x (%d)", (isid >> 31) & 1, (isid >> 30) & 1, isid & 0x00ffffff, isid & 0x00ffffff); subofs += ISID_LEN; sublen -= ISID_LEN; } } } } /* * Name: dissect_lsp_clv_mt_cap() * * Description: Decode an ISIS MT-CAP CLV - code 144. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_isis_lsp_clv_mt_cap(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { if (length >= 2) { /* mtid */ guint16 mtid = tvb_get_ntohs(tvb, offset); proto_tree_add_text( tree, tvb, offset, 2, "MTID: 0x%03x, Overload: %d", (mtid & 0xfff), (mtid & 0x8000) ? 1 : 0); length -= 2; offset += 2; while (length >= 2) { guint8 subtype = tvb_get_guint8(tvb, offset); guint8 subtlvlen = tvb_get_guint8(tvb, offset+1); length -= 2; offset += 2; if (subtlvlen > length) { isis_dissect_unknown( tvb, tree, offset, "Short type 0x%02x TLV (%d vs %d)", subtype, subtlvlen, length); return; } if (subtype == 0x01) { /* SPB Instance */ dissect_isis_lsp_clv_mt_cap_spb_instance(tvb, tree, offset, subtype, subtlvlen); } else if (subtype == 0x02) { /* OALG */ dissect_isis_lsp_clv_mt_cap_spb_oalg(tvb, tree, offset, subtype, subtlvlen); } else if (subtype == 0x03) { /* SPBM Service Identifier */ dissect_isis_lsp_clv_mt_cap_spbm_service_identifier(tvb, tree, offset, subtype, subtlvlen); } else { isis_dissect_unknown( tvb, tree, offset, "Unknown SubTlv: Type: 0x%02x, Length: %d", subtype, subtlvlen); } length -= subtlvlen; offset += subtlvlen; } } } /* * Name: dissect_lsp_authentication_clv() * * Description: * Decode for a lsp packets authenticaion clv. Calls into the * clv common one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_authentication_clv(tvb, tree, offset, length); } /* * Name: dissect_lsp_ip_authentication_clv() * * Description: * Decode for a lsp packets authenticaion clv. Calls into the * clv common one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : proto tree to build on (may be null) * int : current offset into packet data * int : length of IDs in packet. * int : length of this clv * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_ip_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_ip_authentication_clv(tvb, tree, offset, length); } /* * Name: dissect_lsp_area_address_clv() * * Description: * Decode for a lsp packet's area address clv. Call into clv common * one. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. May be NULL * int : offset into packet data where we are. * int : length of IDs in packet. * int : length of clv we are decoding * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_area_address_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { isis_dissect_area_address_clv(tvb, tree, offset, length); } /* * Name: dissect_lsp_eis_neighbors_clv_inner() * * Description: * Real work horse for showing neighbors. This means we decode the * first octet as either virtual/!virtual (if show_virtual param is * set), or as a must == 0 reserved value. * * Once past that, we decode n neighbor elements. Each neighbor * is comprised of a metric block (is dissect_metric) and the * addresses. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. May be NULL * int : offset into packet data where we are. * int : length of IDs in packet. * int : length of clv we are decoding * int : set to decode first octet as virtual vs reserved == 0 * int : set to indicate EIS instead of IS (6 octet per addr instead of 7) * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_eis_neighbors_clv_inner(tvbuff_t *tvb, proto_tree *tree, int offset, int length, int id_length, int show_virtual, int is_eis) { proto_item *ti; proto_tree *ntree = NULL; int tlen; if (!is_eis) { id_length++; /* IDs are one octet longer in IS neighbours */ if ( tree ) { if ( show_virtual ) { /* virtual path flag */ proto_tree_add_text ( tree, tvb, offset, 1, tvb_get_guint8(tvb, offset) ? "IsVirtual" : "IsNotVirtual" ); } else { proto_tree_add_text ( tree, tvb, offset, 1, "Reserved value 0x%02x, must == 0", tvb_get_guint8(tvb, offset) ); } } offset++; length--; } tlen = 4 + id_length; while ( length > 0 ) { if (length 0) { ti = proto_tree_add_text (tree, tvb, offset, -1, "IS neighbor: %s", print_system_id (tvb_get_ptr(tvb, offset, 7), 7) ); ntree = proto_item_add_subtree (ti, ett_isis_lsp_part_of_clv_ext_is_reachability ); proto_tree_add_text (ntree, tvb, offset+7, 3, "Metric: %d", tvb_get_ntoh24(tvb, offset+7) ); subclvs_len = tvb_get_guint8(tvb, offset+10); if (subclvs_len == 0) { proto_tree_add_text (ntree, tvb, offset+10, 1, "no sub-TLVs present"); } else { i = 0; while (i < subclvs_len) { clv_code = tvb_get_guint8(tvb, offset+11+i); clv_len = tvb_get_guint8(tvb, offset+12+i); switch (clv_code) { case 3 : dissect_subclv_admin_group(tvb, ntree, offset+13+i); break; case 4 : proto_tree_add_text(ntree, tvb, offset+13+i, 4, "Link Local Identifier: %d", tvb_get_ntohl(tvb, offset+13+i)); proto_tree_add_text(ntree, tvb, offset+17+i, 4, "Link Remote Identifier: %d", tvb_get_ntohl(tvb, offset+17+i)); break; case 6 : proto_tree_add_text (ntree, tvb, offset+11+i, 6, "IPv4 interface address: %s", tvb_ip_to_str(tvb, offset+13+i)); break; case 8 : proto_tree_add_text (ntree, tvb, offset+11+i, 6, "IPv4 neighbor address: %s", tvb_ip_to_str(tvb, offset+13+i)); break; case 9 : dissect_subclv_max_bw (tvb, ntree, offset+13+i); break; case 10: dissect_subclv_rsv_bw (tvb, ntree, offset+13+i); break; case 11: dissect_subclv_unrsv_bw (tvb, ntree, offset+13+i); break; case 18: proto_tree_add_text (ntree, tvb, offset+11+i, 5, "Traffic engineering default metric: %d", tvb_get_ntoh24(tvb, offset+13+i) ); break; case 29: dissect_subclv_spb_link_metric(tvb, ntree, offset+13+i, clv_code, clv_len); break; case 250: case 251: case 252: case 253: case 254: proto_tree_add_text (ntree, tvb, offset+11+i, clv_len+2, "Unknown Cisco specific extensions: code %d, length %d", clv_code, clv_len ); break; default : proto_tree_add_text (ntree, tvb, offset+11+i, clv_len+2, "Unknown sub-CLV: code %d, length %d", clv_code, clv_len ); break; } i += clv_len + 2; } } len = 11 + subclvs_len; proto_item_set_len (ti, len); offset += len; length -= len; } } /* * Name: dissect_lsp_mt_reachable_IPv4_prefx_clv() * * Description: Decode Multi-Topology IPv4 Prefixes - code 235 * * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. May be NULL * int : offset into packet data where we are. * int : length of IDs in packet. * int : length of clv we are decoding * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_mt_reachable_IPv4_prefx_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { if (!tree) return; if (length < 2) { isis_dissect_unknown(tvb, tree, offset, "short lsp multi-topology reachable IPv4 prefixes(%d vs %d)", length, 2 ); return; } dissect_lsp_mt_id(tvb, tree, offset); dissect_lsp_ext_ip_reachability_clv(tvb, tree, offset+2, 0, length-2); } /* * Name: dissect_lsp_mt_reachable_IPv6_prefx_clv() * * Description: Decode Multi-Topology IPv6 Prefixes - code 237 * * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. May be NULL * int : offset into packet data where we are. * int : length of IDs in packet. * int : length of clv we are decoding * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_mt_reachable_IPv6_prefx_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { if (!tree) return; if (length < 2) { isis_dissect_unknown(tvb, tree, offset, "short lsp multi-topology reachable IPv6 prefixes(%d vs %d)", length, 2 ); return; } dissect_lsp_mt_id(tvb, tree, offset); dissect_lsp_ipv6_reachability_clv(tvb, tree, offset+2, 0, length-2); } /* * Name: dissect_lsp_mt_is_reachability_clv() * * Description: Decode Multi-Topology Intermediate Systems - code 222 * * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. May be NULL * int : offset into packet data where we are. * int : unused * int : length of clv we are decoding * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_mt_is_reachability_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { if (!tree) return; if (length < 2) { isis_dissect_unknown(tvb, tree, offset, "short lsp reachability(%d vs %d)", length, 2 ); return; } /* * the MT ID value dissection is used in other LSPs so we push it * in a function */ dissect_lsp_mt_id(tvb, tree, offset); /* * fix here. No need to parse TLV 22 (with bugs) while it is * already done correctly!! */ dissect_lsp_ext_is_reachability_clv(tvb, tree, offset+2, 0, length-2); } /* * Name: dissect_lsp_partition_dis_clv() * * Description: * This CLV is used to indicate which system is the designated * IS for partition repair. This means just putting out the * "id_length"-octet IS. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. May be NULL * int : offset into packet data where we are. * int : length of IDs in packet. * int : length of clv we are decoding * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_partition_dis_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length, int length) { if ( length < id_length ) { isis_dissect_unknown(tvb, tree, offset, "short lsp partition DIS(%d vs %d)", length, id_length ); return; } /* * Gotta build a sub-tree for all our pieces */ if ( tree ) { proto_tree_add_text ( tree, tvb, offset, id_length, "Partition designated L2 IS: %s", print_system_id( tvb_get_ptr(tvb, offset, id_length), id_length ) ); } length -= id_length; offset += id_length; if ( length > 0 ) { isis_dissect_unknown(tvb, tree, offset, "Long lsp partition DIS, %d left over", length ); return; } } /* * Name: dissect_lsp_prefix_neighbors_clv() * * Description: * The prefix CLV describes what other (OSI) networks we can reach * and what their cost is. It is built from a metric block * (see dissect_metric) followed by n addresses. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to fill out. May be NULL * int : offset into packet data where we are. * int : length of IDs in packet. * int : length of clv we are decoding * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_prefix_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset, int id_length _U_, int length) { char *sbuf; int mylen; if ( length < 4 ) { isis_dissect_unknown(tvb, tree, offset, "Short lsp prefix neighbors (%d vs 4)", length ); return; } if ( tree ) { dissect_metric (tvb, tree, offset, tvb_get_guint8(tvb, offset), "Default", TRUE ); dissect_metric (tvb, tree, offset+1, tvb_get_guint8(tvb, offset+1), "Delay", FALSE ); dissect_metric (tvb, tree, offset+2, tvb_get_guint8(tvb, offset+2), "Expense", FALSE ); dissect_metric (tvb, tree, offset+3, tvb_get_guint8(tvb, offset+3), "Error", FALSE ); } offset += 4; length -= 4; while ( length > 0 ) { mylen = tvb_get_guint8(tvb, offset); length--; if (length<=0) { isis_dissect_unknown(tvb, tree, offset, "Zero payload space after length in prefix neighbor" ); return; } if ( mylen > length) { isis_dissect_unknown(tvb, tree, offset, "Integral length of prefix neighbor too long (%d vs %d)", mylen, length ); return; } /* * Lets turn the area address into "standard" 0000.0000.etc * format string. */ sbuf = print_area( tvb_get_ptr(tvb, offset+1, mylen), mylen ); /* and spit it out */ if ( tree ) { proto_tree_add_text ( tree, tvb, offset, mylen + 1, "Area address (%d): %s", mylen, sbuf ); } offset += mylen + 1; length -= mylen; /* length already adjusted for len fld*/ } } static void isis_lsp_checkum_additional_info(tvbuff_t * tvb, packet_info * pinfo, proto_item * it_cksum, int offset, gboolean is_cksum_correct) { proto_tree * checksum_tree; proto_item * item; checksum_tree = proto_item_add_subtree(it_cksum, ett_isis_lsp_cksum); item = proto_tree_add_boolean(checksum_tree, hf_isis_lsp_checksum_good, tvb, offset, 2, is_cksum_correct); PROTO_ITEM_SET_GENERATED(item); item = proto_tree_add_boolean(checksum_tree, hf_isis_lsp_checksum_bad, tvb, offset, 2, !is_cksum_correct); PROTO_ITEM_SET_GENERATED(item); if (!is_cksum_correct) { expert_add_info_format(pinfo, item, PI_CHECKSUM, PI_ERROR, "Bad checksum"); col_append_str(pinfo->cinfo, COL_INFO, " [ISIS CHECKSUM INCORRECT]"); } } /* * Name: isis_dissect_isis_lsp() * * Description: * Print out the LSP part of the main header and then call the CLV * de-mangler with the right list of valid CLVs. * * Input: * tvbuff_t * : tvbuffer for packet data * proto_tree * : protocol display tree to add to. May be NULL. * int offset : our offset into packet data. * int : LSP type, a la packet-isis.h ISIS_TYPE_* values * int : header length of packet. * int : length of IDs in packet. * * Output: * void, but we will add to proto tree if !NULL. */ void isis_dissect_isis_lsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, int lsp_type, int header_length, int id_length) { proto_item *ti, *to, *ta; proto_tree *lsp_tree = NULL, *info_tree, *att_tree; guint16 pdu_length, lifetime, checksum, cacl_checksum=0; guint8 lsp_info, lsp_att; int len, offset_checksum; proto_item *it_cksum; if (tree) { ti = proto_tree_add_text(tree, tvb, offset, -1, PROTO_STRING_LSP); lsp_tree = proto_item_add_subtree(ti, ett_isis_lsp); } pdu_length = tvb_get_ntohs(tvb, offset); if (tree) { proto_tree_add_uint(lsp_tree, hf_isis_lsp_pdu_length, tvb, offset, 2, pdu_length); } offset += 2; if (tree) { proto_tree_add_item(lsp_tree, hf_isis_lsp_remaining_life, tvb, offset, 2, ENC_BIG_ENDIAN); } lifetime = tvb_get_ntohs(tvb, offset); offset += 2; offset_checksum = offset; if (tree) { char* value = print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2); proto_tree_add_string_format(lsp_tree, hf_isis_lsp_lsp_id, tvb, offset, id_length + 2, value, "LSP-ID: %s", value); } if (check_col(pinfo->cinfo, COL_INFO)) { col_append_fstr(pinfo->cinfo, COL_INFO, ", LSP-ID: %s", print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) ); } offset += id_length + 2; if (tree) { proto_tree_add_item(lsp_tree, hf_isis_lsp_sequence_number, tvb, offset, 4, ENC_BIG_ENDIAN); } if (check_col(pinfo->cinfo, COL_INFO)) { col_append_fstr(pinfo->cinfo, COL_INFO, ", Sequence: 0x%08x, Lifetime: %5us", tvb_get_ntohl(tvb, offset), tvb_get_ntohs(tvb, offset - (id_length+2+2))); } offset += 4; if (tree) { checksum = lifetime ? tvb_get_ntohs(tvb, offset) : 0; switch (check_and_get_checksum(tvb, offset_checksum, pdu_length-12, checksum, offset, &cacl_checksum)) { case NO_CKSUM : checksum = tvb_get_ntohs(tvb, offset); proto_tree_add_uint_format(lsp_tree, hf_isis_lsp_checksum, tvb, offset, 2, checksum, "Checksum: 0x%04x [unused]", checksum); break; case DATA_MISSING : isis_dissect_unknown(tvb, tree, offset, "[packet length %d went beyond packet]", tvb_length_remaining(tvb, offset_checksum)); break; case CKSUM_NOT_OK : it_cksum = proto_tree_add_uint_format(lsp_tree, hf_isis_lsp_checksum, tvb, offset, 2, checksum, "Checksum: 0x%04x [incorrect, should be 0x%04x]", checksum, cacl_checksum); isis_lsp_checkum_additional_info(tvb, pinfo, it_cksum, offset, FALSE); break; case CKSUM_OK : it_cksum = proto_tree_add_uint_format(lsp_tree, hf_isis_lsp_checksum, tvb, offset, 2, checksum, "Checksum: 0x%04x [correct]", checksum); isis_lsp_checkum_additional_info(tvb, pinfo, it_cksum, offset, TRUE); break; default : g_message("'check_and_get_checksum' returned an invalid value"); } } offset += 2; if (tree) { /* * P | ATT | HIPPITY | IS TYPE description. */ lsp_info = tvb_get_guint8(tvb, offset); to = proto_tree_add_text(lsp_tree, tvb, offset, 1, "Type block(0x%02x): Partition Repair:%d, Attached bits:%d, Overload bit:%d, IS type:%d", lsp_info, ISIS_LSP_PARTITION(lsp_info), ISIS_LSP_ATT(lsp_info), ISIS_LSP_HIPPITY(lsp_info), ISIS_LSP_IS_TYPE(lsp_info) ); info_tree = proto_item_add_subtree(to, ett_isis_lsp_info); proto_tree_add_boolean(info_tree, hf_isis_lsp_p, tvb, offset, 1, lsp_info); ta = proto_tree_add_uint(info_tree, hf_isis_lsp_att, tvb, offset, 1, lsp_info); att_tree = proto_item_add_subtree(ta, ett_isis_lsp_att); lsp_att = ISIS_LSP_ATT(lsp_info); proto_tree_add_text(att_tree, tvb, offset, 1, "%d... = Error metric: %s", ISIS_LSP_ATT_ERROR(lsp_att), ISIS_LSP_ATT_ERROR(lsp_att) ? "Set" : "Unset"); proto_tree_add_text(att_tree, tvb, offset, 1, ".%d.. = Expense metric: %s", ISIS_LSP_ATT_EXPENSE(lsp_att), ISIS_LSP_ATT_EXPENSE(lsp_att) ? "Set" : "Unset"); proto_tree_add_text(att_tree, tvb, offset, 1, "..%d. = Delay metric: %s", ISIS_LSP_ATT_DELAY(lsp_att), ISIS_LSP_ATT_DELAY(lsp_att) ? "Set" : "Unset"); proto_tree_add_text(att_tree, tvb, offset, 1, "...%d = Default metric: %s", ISIS_LSP_ATT_DEFAULT(lsp_att), ISIS_LSP_ATT_DEFAULT(lsp_att) ? "Set" : "Unset"); proto_tree_add_boolean(info_tree, hf_isis_lsp_hippity, tvb, offset, 1, lsp_info); proto_tree_add_uint(info_tree, hf_isis_lsp_is_type, tvb, offset, 1, lsp_info); } offset += 1; len = pdu_length - header_length; if (len < 0) { isis_dissect_unknown(tvb, tree, offset, "packet header length %d went beyond packet", header_length ); return; } /* * Now, we need to decode our CLVs. We need to pass in * our list of valid ones! */ if (lsp_type == ISIS_TYPE_L1_LSP) { isis_dissect_clvs(tvb, lsp_tree, offset, clv_l1_lsp_opts, len, id_length, ett_isis_lsp_clv_unknown ); } else { isis_dissect_clvs(tvb, lsp_tree, offset, clv_l2_lsp_opts, len, id_length, ett_isis_lsp_clv_unknown ); } } /* * Name: isis_register_lsp() * * Description: * Register our protocol sub-sets with protocol manager. * * Input: * int : protocol index for the ISIS protocol * * Output: * void */ void isis_register_lsp(int proto_isis) { static hf_register_info hf[] = { { &hf_isis_lsp_pdu_length, { "PDU length", "isis.lsp.pdu_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_remaining_life, { "Remaining lifetime", "isis.lsp.remaining_life", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_lsp_id, { "LSP-ID", "isis.lsp.lsp_id", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_hostname, { "Hostname", "isis.lsp.hostname", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_sequence_number, { "Sequence number", "isis.lsp.sequence_number", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_checksum, { "Checksum", "isis.lsp.checksum",FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_checksum_good, { "Good Checksum", "isis.lsp.checksum_good", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Good IS-IS LSP Checksum", HFILL }}, { &hf_isis_lsp_checksum_bad, { "Bad Checksum", "isis.lsp.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Bad IS-IS LSP Checksum", HFILL }}, { &hf_isis_lsp_clv_ipv4_int_addr, { "IPv4 interface address", "isis.lsp.clv_ipv4_int_addr", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_clv_ipv6_int_addr, { "IPv6 interface address", "isis.lsp.clv_ipv6_int_addr", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_clv_te_router_id, { "Traffic Engineering Router ID", "isis.lsp.clv_te_router_id", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_clv_mt, { "MT-ID", "isis.lsp.clv_mt", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_p, { "Partition Repair", "isis.lsp.partition_repair", FT_BOOLEAN, 8, TFS(&tfs_supported_not_supported), ISIS_LSP_PARTITION_MASK, "If set, this router supports the optional Partition Repair function", HFILL }}, { &hf_isis_lsp_att, { "Attachment", "isis.lsp.att", FT_UINT8, BASE_DEC, NULL, ISIS_LSP_ATT_MASK, NULL, HFILL }}, { &hf_isis_lsp_hippity, { "Overload bit", "isis.lsp.overload", FT_BOOLEAN, 8, TFS(&tfs_set_notset), ISIS_LSP_HIPPITY_MASK, "If set, this router will not be used by any decision process to calculate routes", HFILL }}, { &hf_isis_lsp_root_id, { "Root Bridge ID", "isis.lsp.root.id", FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }}, { &hf_isis_lsp_is_type, { "Type of Intermediate System", "isis.lsp.is_type", FT_UINT8, BASE_DEC, VALS(isis_lsp_istype_vals), ISIS_LSP_IS_TYPE_MASK, NULL, HFILL }}, { &hf_isis_lsp_spb_link_metric, { "SPB Link Metric", "isis.lsp.spb.link_metric", FT_UINT24, BASE_HEX_DEC, NULL, 0, NULL, HFILL }}, { &hf_isis_lsp_spb_port_count, { "Number of Ports", "isis.lsp.spb.port_count", FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL }}, { &hf_isis_lsp_spb_port_id, { "Port Id", "isis.lsp.spb.port_id", FT_UINT16, BASE_HEX_DEC, NULL, 0, NULL, HFILL }} }; static gint *ett[] = { &ett_isis_lsp, &ett_isis_lsp_info, &ett_isis_lsp_att, &ett_isis_lsp_cksum, &ett_isis_lsp_clv_area_addr, &ett_isis_lsp_clv_is_neighbors, &ett_isis_lsp_clv_ext_is_reachability, /* CLV 22 */ &ett_isis_lsp_part_of_clv_ext_is_reachability, &ett_isis_lsp_subclv_admin_group, &ett_isis_lsp_subclv_unrsv_bw, &ett_isis_lsp_subclv_spb_link_metric, &ett_isis_lsp_clv_unknown, &ett_isis_lsp_clv_partition_dis, &ett_isis_lsp_clv_prefix_neighbors, &ett_isis_lsp_clv_authentication, &ett_isis_lsp_clv_ip_authentication, &ett_isis_lsp_clv_nlpid, &ett_isis_lsp_clv_hostname, &ett_isis_lsp_clv_ipv4_int_addr, &ett_isis_lsp_clv_ipv6_int_addr, /* CLV 232 */ &ett_isis_lsp_clv_mt_cap, &ett_isis_lsp_clv_mt_cap_spb_instance, &ett_isis_lsp_clv_mt_cap_spbm_service_identifier, &ett_isis_lsp_clv_te_router_id, &ett_isis_lsp_clv_ip_reachability, &ett_isis_lsp_clv_ip_reach_subclv, &ett_isis_lsp_clv_ext_ip_reachability, /* CLV 135 */ &ett_isis_lsp_part_of_clv_ext_ip_reachability, &ett_isis_lsp_clv_ipv6_reachability, /* CLV 236 */ &ett_isis_lsp_part_of_clv_ipv6_reachability, &ett_isis_lsp_clv_mt, &ett_isis_lsp_clv_mt_is, &ett_isis_lsp_part_of_clv_mt_is, &ett_isis_lsp_clv_rt_capable_IPv4_prefx, &ett_isis_lsp_clv_grp_address_IPv4_prefx, /*CLV 142*/ &ett_isis_lsp_clv_mt_reachable_IPv4_prefx, &ett_isis_lsp_clv_mt_reachable_IPv6_prefx }; proto_register_field_array(proto_isis, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); }