/* packet-isis-lsp.c * Routines for decoding isis lsp packets and their CLVs * * $Id: packet-isis-lsp.c,v 1.9 2000/08/13 14:08:22 deniel Exp $ * Stuart Stanley * * Ethereal - 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * * */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #ifdef HAVE_SYS_TYPES_H # include #endif #include #include #include #ifdef HAVE_NET_INET_H #include #endif #include "packet.h" #include "packet-osi.h" #include "packet-isis.h" #include "packet-isis-clv.h" #include "packet-isis-lsp.h" #include "resolv.h" /* lsp packets */ static int proto_isis_lsp = -1; 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_checksum = -1; static int hf_isis_lsp_clv_ipv4_int_addr = -1; static gint ett_isis_lsp = -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_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_auth = -1; static gint ett_isis_lsp_clv_ipv4_int_addr = -1; static gint ett_isis_lsp_clv_ip_reachability = -1; static const char *isis_lsp_attached_bits[] = { "error", "expense", "delay", "default" }; static const value_string isis_lsp_istype_vals[] = { { ISIS_LSP_TYPE_UNUSED0, "Unused 0x0 (invalid)"}, { ISIS_LSP_TYPE_LEVEL_1, "Level 1 IS"}, { ISIS_LSP_TYPE_UNUSED2, "Unused 0x2 (invalid)"}, { ISIS_LSP_TYPE_LEVEL_2, "Level 2 IS"}, { 0, NULL } }; /* * Predclare dissectors for use in clv dissection. */ static void dissect_lsp_area_address_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_l1_is_neighbors_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_l1_es_neighbors_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_l2_is_neighbors_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_partition_dis_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_prefix_neighbors_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_ip_reachability_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_nlpid_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_ip_int_addr_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_l1_auth_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static void dissect_lsp_l2_auth_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree); static const isis_clv_handle_t clv_l1_lsp_opts[] = { { ISIS_CLV_L1_LSP_AREA_ADDRESS, "Area address(es)", &ett_isis_lsp_clv_area_addr, dissect_lsp_area_address_clv }, { ISIS_CLV_L1_LSP_IS_NEIGHBORS, "IS Neighbor(s)", &ett_isis_lsp_clv_is_neighbors, dissect_lsp_l1_is_neighbors_clv }, { ISIS_CLV_L1_LSP_ES_NEIGHBORS, "ES Neighbor(s)", &ett_isis_lsp_clv_is_neighbors, dissect_lsp_l1_es_neighbors_clv }, { ISIS_CLV_L1_LSP_IP_INT_REACHABLE, "IP Internal reachability", &ett_isis_lsp_clv_ip_reachability, dissect_lsp_ip_reachability_clv }, { ISIS_CLV_L1_LSP_NLPID, "NLPID", &ett_isis_lsp_clv_nlpid, dissect_lsp_nlpid_clv }, { ISIS_CLV_L1_LSP_IP_INTERFACE_ADDR, "IP Interface address(es)", &ett_isis_lsp_clv_ipv4_int_addr, dissect_lsp_ip_int_addr_clv }, { ISIS_CLV_L1_LSP_AUTHENTICATION_NS, "Authentication(non-spec)", &ett_isis_lsp_clv_auth, dissect_lsp_l1_auth_clv }, { ISIS_CLV_L1_LSP_AUTHENTICATION, "Authentication", &ett_isis_lsp_clv_auth, dissect_lsp_l1_auth_clv }, { 0, "", NULL, NULL } }; static const isis_clv_handle_t clv_l2_lsp_opts[] = { { ISIS_CLV_L1_LSP_AREA_ADDRESS, "Area address(es)", &ett_isis_lsp_clv_area_addr, dissect_lsp_area_address_clv }, { ISIS_CLV_L2_LSP_IS_NEIGHBORS, "IS Neighbor(s)", &ett_isis_lsp_clv_is_neighbors, dissect_lsp_l2_is_neighbors_clv }, { ISIS_CLV_L2_LSP_PARTITION_DIS, "Parition Designated Level 2 IS", &ett_isis_lsp_clv_partition_dis, dissect_lsp_partition_dis_clv }, { ISIS_CLV_L2_LSP_PREFIX_NEIGHBORS, "Prefix neighbors", &ett_isis_lsp_clv_prefix_neighbors, dissect_lsp_prefix_neighbors_clv }, { ISIS_CLV_L2_LSP_IP_INT_REACHABLE, "IP Internal reachability", &ett_isis_lsp_clv_ip_reachability, dissect_lsp_ip_reachability_clv }, { ISIS_CLV_L2_LSP_NLPID, "NLPID", &ett_isis_lsp_clv_nlpid, dissect_lsp_nlpid_clv }, { ISIS_CLV_L2_LSP_IP_EXT_REACHABLE, "IP external reachability", &ett_isis_lsp_clv_ip_reachability, dissect_lsp_ip_reachability_clv }, { ISIS_CLV_L2_LSP_IP_INTERFACE_ADDR, "IP Interface address(es)", &ett_isis_lsp_clv_ipv4_int_addr, dissect_lsp_ip_int_addr_clv }, { ISIS_CLV_L2_LSP_AUTHENTICATION_NS, "Authentication(non spec)", &ett_isis_lsp_clv_auth, dissect_lsp_l2_auth_clv }, { ISIS_CLV_L2_LSP_AUTHENTICATION, "Authentication", &ett_isis_lsp_clv_auth, dissect_lsp_l2_auth_clv }, { 0, "", NULL, NULL } }; /* * 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: * u_char * : packet data * int : offset into packet data where we are. * guint : length of clv we are decoding * frame_data * : frame data (complete frame) * proto_tree * : protocol display tree to fill out. May be NULL * 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(proto_tree *tree, int offset, guint8 value, char *pstr, int force_supported ) { int s; if ( !tree ) return; s = ISIS_LSP_CLV_METRIC_SUPPORTED(value); proto_tree_add_text ( tree, NullTVB, 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_reachabillityclv() * * 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: * u_char * : packet data * int : current offset into packet data * guint : length of this clv * int : length of IDs in packet. * frame_data * : frame data * proto_tree * : proto tree to build on (may be null) * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_ip_reachability_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree) { proto_item *ti; proto_tree *ntree = NULL; guint32 src, mask; while ( length > 0 ) { if (length<12) { isis_dissect_unknown(offset, length, tree, fd, "short IP reachability (%d vs 12)", length ); return; } /* * Gotta build a sub-tree for all our pieces */ if ( tree ) { memcpy(&src, &pd[offset+4], 4); memcpy(&mask, &pd[offset+8], 4); ti = proto_tree_add_text ( tree, NullTVB, offset, 12, "IP prefix: %s (%s) : %s", get_hostname(src), ip_to_str((guint8*)&src), ip_to_str((guint8*)&mask) ); ntree = proto_item_add_subtree(ti, ett_isis_lsp_clv_ip_reachability); dissect_metric ( ntree, offset, pd[offset], "Default", TRUE ); dissect_metric ( ntree, offset + 1, pd[offset+1], "Delay", FALSE ); dissect_metric ( ntree, offset + 2, pd[offset+2], "Expense",FALSE ); dissect_metric ( ntree, offset + 3, pd[offset+3], "Error", FALSE ); } offset += 12; length -= 12; } } /* * Name: dissect_lsp_nlpid_clv() * * Description: * Decode for a lsp packets NLPID clv. Calls into the * clv common one. * * Input: * u_char * : packet data * int : current offset into packet data * guint : length of this clv * int : length of IDs in packet. * frame_data * : frame data * proto_tree * : proto tree to build on (may be null) * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_nlpid_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree) { isis_dissect_nlpid_clv(pd, offset, length, fd, tree ); } /* * Name: dissect_lsp_ip_int_addr_clv() * * Description: * Decode for a lsp packets ip interface addr clv. Calls into the * clv common one. * * Input: * u_char * : packet data * int : current offset into packet data * guint : length of this clv * int : length of IDs in packet. * frame_data * : frame data * proto_tree * : proto tree to build on (may be null) * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_ip_int_addr_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree) { isis_dissect_ip_int_clv(pd, offset, length, fd, tree, hf_isis_lsp_clv_ipv4_int_addr ); } /* * Name: dissect_lsp_L1_auth_clv() * * Description: * Decode for a lsp packets authenticaion clv. Calls into the * clv common one. An auth inside a L1 LSP is a per area password * * Input: * u_char * : packet data * int : current offset into packet data * guint : length of this clv * int : length of IDs in packet. * frame_data * : frame data * proto_tree * : proto tree to build on (may be null) * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_l1_auth_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree) { isis_dissect_authentication_clv(pd, offset, length, fd, tree, "Per area authentication" ); } /* * Name: dissect_lsp_L2_auth_clv() * * Description: * Decode for a lsp packets authenticaion clv. Calls into the * clv common one. An auth inside a L2 LSP is a per domain password * * Input: * u_char * : packet data * int : current offset into packet data * guint : length of this clv * int : length of IDs in packet. * frame_data * : frame data * proto_tree * : proto tree to build on (may be null) * * Output: * void, will modify proto_tree if not null. */ static void dissect_lsp_l2_auth_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree) { isis_dissect_authentication_clv(pd, offset, length, fd, tree, "Per domain authentication" ); } /* * Name: dissect_lsp_area_address_clv() * * Description: * Decode for a lsp packet's area address clv. Call into clv common * one. * * Input: * u_char * : packet data * int : offset into packet data where we are. * guint : length of clv we are decoding * int : length of IDs in packet. * frame_data * : frame data (complete frame) * proto_tree * : protocol display tree to fill out. May be NULL * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_area_address_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree) { isis_dissect_area_address_clv(pd, offset, length, fd, tree ); } /* * 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: * u_char * : packet data * int : offset into packet data where we are. * guint : length of clv we are decoding * int : length of IDs in packet. * frame_data * : frame data (complete frame) * proto_tree * : protocol display tree to fill out. May be NULL * 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(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree, 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, NullTVB, offset, 1, &pd[offset] ? "IsNotVirtual" : "IsVirtual" ); } else { proto_tree_add_text ( tree, NullTVB, offset, 1, "Reserved value 0x%02x, must == 0", pd[offset] ); } } offset++; length--; } tlen = 4 + id_length; while ( length > 0 ) { if (length 0 ){ isis_dissect_unknown(offset, length, tree, fd, "Long lsp parition 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: * u_char * : packet data * int : offset into packet data where we are. * guint : length of clv we are decoding * int : length of IDs in packet. * frame_data * : frame data (complete frame) * proto_tree * : protocol display tree to fill out. May be NULL * * Output: * void, but we will add to proto tree if !NULL. */ static void dissect_lsp_prefix_neighbors_clv(const u_char *pd, int offset, guint length, int id_length, frame_data *fd, proto_tree *tree) { char *sbuf; int mylen; if ( length < 4 ) { isis_dissect_unknown(offset, length, tree, fd, "Short lsp prefix neighbors (%d vs 4)", length ); return; } if ( tree ) { dissect_metric ( tree, offset, pd[offset], "Default", TRUE ); dissect_metric ( tree, offset + 1, pd[offset+1], "Delay", FALSE ); dissect_metric ( tree, offset + 2, pd[offset+2], "Expense", FALSE ); dissect_metric ( tree, offset + 3, pd[offset+3], "Error", FALSE ); } offset += 4; length -= 4; while ( length > 0 ) { mylen = pd[offset]; length--; if (length<=0) { isis_dissect_unknown(offset, length, tree, fd, "Zero payload space after length in prefix neighbor" ); return; } if ( mylen > length) { isis_dissect_unknown(offset, length, tree, fd, "Interal 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( pd + offset + 1, mylen ); /* and spit it out */ if ( tree ) { proto_tree_add_text ( tree, NullTVB, offset, mylen + 1, "Area address (%d): %s", mylen, sbuf ); } offset += mylen + 1; length -= mylen; /* length already adjusted for len fld*/ } } /* * Name: isis_lsp_decode_lsp_id() * * Description: * Display a LSP id into the display tree. * * Input: * char * : title string * proto_tree * : tree to display into. REQUIRED * u_char * : packet data * int : offset into packet data where we are. * int : length of IDs in packet. * * Output: * void, but we will add to proto tree */ void isis_lsp_decode_lsp_id(char *tstr, proto_tree *tree, const u_char *pd, int offset, int id_length ) { proto_tree_add_text(tree, NullTVB, offset, id_length + 2, "%s: %s.%02x-%02x", tstr, print_system_id( pd + offset, id_length ), pd[offset + id_length], pd[offset + id_length + 1] ); } /* * 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: * int : LSP type, a la packet-isis.h ISIS_TYPE_* values * int : header length of packet. * int : length of IDs in packet. * u_char * : packet data * int offset : our offset into packet data. * frame_data * : frame data * proto_tree * : protocol display tree to add to. May be NULL. * * Output: * void, but we will add to proto tree if !NULL. */ void isis_dissect_isis_lsp(int lsp_type, int header_length, int id_length, const u_char *pd, int offset, frame_data *fd, proto_tree *tree){ proto_item *ti; proto_tree *lsp_tree = NULL; int hlen; guint16 pdu_length; char sbuf[128]; int inx, q, some, value, len; OLD_CHECK_DISPLAY_AS_DATA(proto_isis_lsp, pd, offset, fd, tree); hlen = 2+2+id_length+2+4+2+1; if (!BYTES_ARE_IN_FRAME(offset, hlen)) { isis_dissect_unknown(offset, hlen, tree, fd, "not enough capture data for header (%d vs %d)", hlen, END_OF_FRAME); return; } if (tree) { ti = proto_tree_add_item(tree, proto_isis_lsp, NullTVB, offset, END_OF_FRAME, FALSE); lsp_tree = proto_item_add_subtree(ti, ett_isis_lsp); } pdu_length = pntohs(&pd[offset]); if (tree) { proto_tree_add_uint(lsp_tree, hf_isis_lsp_pdu_length, NullTVB, offset, 2, pdu_length); } offset += 2; if (tree) { proto_tree_add_uint(lsp_tree, hf_isis_lsp_remaining_life, NullTVB, offset, 2, pntohs(&pd[offset])); } offset += 2; if (tree) { isis_lsp_decode_lsp_id("LSP ID", lsp_tree, pd, offset, id_length ); } offset += id_length + 2; if (tree) { proto_tree_add_uint(lsp_tree, hf_isis_lsp_sequence_number, NullTVB, offset, 4, pntohl(&pd[offset])); } offset += 4; if (tree) { /* XXX -> we could validate the cksum here! */ proto_tree_add_uint(lsp_tree, hf_isis_lsp_checksum, NullTVB, offset, 2, pntohs(&pd[offset])); } offset += 2; if (tree) { /* * We need to build our type block values. */ sbuf[0] = 0; some = 0; value = ISIS_LSP_ATT(pd[offset]); inx = 0; for ( q = (1< 0; q = q >> 1 ){ if (q & value) { if (some++) { strcat(sbuf, ", "); } strcat ( sbuf, isis_lsp_attached_bits[inx] ); } inx++; } if (!some) { strcat ( sbuf, "" ); } proto_tree_add_text(lsp_tree, NullTVB, offset + 18, 1, "Type block(0x%02x): P:%d, Supported metric(s): %s, OL:%d, istype:%s", pd[offset], ISIS_LSP_PARTITION(pd[offset]) ? 1 : 0, sbuf, ISIS_LSP_HIPPITY(pd[offset]) ? 1 : 0, val_to_str(ISIS_LSP_IS_TYPE(pd[offset]), isis_lsp_istype_vals, "Unknown (0x%x)") ); } offset += 1; len = pdu_length - header_length; if (len < 0) { isis_dissect_unknown(offset, header_length, tree, fd, "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 ( clv_l1_lsp_opts, len, id_length, pd, offset, fd, lsp_tree, ett_isis_lsp_clv_unknown ); } else { isis_dissect_clvs ( clv_l2_lsp_opts, len, id_length, pd, offset, fd, lsp_tree, ett_isis_lsp_clv_unknown ); } } /* * Name: proto_register_isis_lsp() * * Description: * Register our protocol sub-sets with protocol manager. * NOTE: this procedure is autolinked by the makefile process that * builds register.c * * Input: * u_char * : packet data * int : offset into packet data where we are. * guint : length of clv we are decoding * frame_data * : frame data (complete frame) * proto_tree * : protocol display tree to fill out. May be NULL * * Output: * void, but we will add to proto tree if !NULL. */ void proto_register_isis_lsp(void) { static hf_register_info hf[] = { { &hf_isis_lsp_pdu_length, { "PDU length", "isis_lsp.pdu_length", FT_UINT16, BASE_DEC, NULL, 0x0, "" }}, { &hf_isis_lsp_remaining_life, { "Remaining life", "isis_lsp.remaining_life", FT_UINT16, BASE_DEC, NULL, 0x0, "" }}, { &hf_isis_lsp_sequence_number, { "Sequence number", "isis_lsp.sequence_number", FT_UINT32, BASE_HEX, NULL, 0x0, "" }}, { &hf_isis_lsp_checksum, { "Checksum", "isis_lsp.checksum",FT_UINT16, BASE_HEX, NULL, 0x0, "" }}, { &hf_isis_lsp_clv_ipv4_int_addr, { "IPv4 interface address: ", "isis_lsp.clv_ipv4_int_addr", FT_IPv4, BASE_NONE, NULL, 0x0, "" }}, }; static gint *ett[] = { &ett_isis_lsp, &ett_isis_lsp_clv_area_addr, &ett_isis_lsp_clv_is_neighbors, &ett_isis_lsp_clv_unknown, &ett_isis_lsp_clv_partition_dis, &ett_isis_lsp_clv_prefix_neighbors, &ett_isis_lsp_clv_auth, &ett_isis_lsp_clv_nlpid, &ett_isis_lsp_clv_ipv4_int_addr, &ett_isis_lsp_clv_ip_reachability, }; proto_isis_lsp = proto_register_protocol( PROTO_STRING_LSP, "isis_lsp"); proto_register_field_array(proto_isis_lsp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); }