/* packet-isis-core.c * Routines for ISO/OSI network and transport protocol packet disassembly, core * bits. * * $Id: packet-isis.c,v 1.14 2000/08/13 14:08:23 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 #include "packet.h" #include "nlpid.h" #include "packet-osi.h" #include "packet-isis.h" #include "packet-isis-lsp.h" #include "packet-isis-hello.h" #include "packet-isis-snp.h" /* isis base header */ static int proto_isis = -1; static int hf_isis_irpd = -1; static int hf_isis_header_length = -1; static int hf_isis_version = -1; static int hf_isis_system_id_length = -1; static int hf_isis_type = -1; static int hf_isis_version2 = -1; static int hf_isis_reserved = -1; static int hf_isis_max_area_adr = -1; static gint ett_isis = -1; static const value_string isis_vals[] = { { ISIS_TYPE_L1_HELLO, "L1 HELLO"}, { ISIS_TYPE_L2_HELLO, "L2 HELLO"}, { ISIS_TYPE_PTP_HELLO, "P2P HELLO"}, { ISIS_TYPE_L1_LSP, "L1 LSP"}, { ISIS_TYPE_L2_LSP, "L2 LSP"}, { ISIS_TYPE_L1_CSNP, "L1 CSNP"}, { ISIS_TYPE_L2_CSNP, "L2 CSNP"}, { ISIS_TYPE_L1_PSNP, "L1 PSNP"}, { ISIS_TYPE_L2_PSNP, "L2 PSNP"}, { 0, NULL} }; /* * Name: dissect_isis_unknown() * * Description: * There was some error in the protocol and we are in unknown space * here. Add a tree item to cover the error and go on. Note * that we make sure we don't go off the end of the bleedin packet here! * * Input * unt offset : Current offset into packet data. * int len : length of to dump. * proto_tree * : tree of display data. May be NULL. * frame_data * fd : frame data * char * : format text * * Output: * void (may modify proto tree) */ void isis_dissect_unknown(int offset,guint length,proto_tree *tree,frame_data *fd, char *fmat, ...){ va_list ap; if ( !IS_DATA_IN_FRAME(offset) ) { /* * big oops They were off the end of the packet already. * Just ignore this one. */ return; } if ( !BYTES_ARE_IN_FRAME(offset, length) ) { /* * length will take us past eop. Truncate length. */ length = END_OF_FRAME; } va_start(ap, fmat); proto_tree_add_text_valist(tree, NullTVB, offset, length, fmat, ap); va_end(ap); } /* * Name: dissect_isis() * * Description: * Main entry area for isis de-mangling. This will build the * main isis tree data and call the sub-protocols as needed. * * Input: * u_char * : packet data * int : offset into packet where we are (packet_data[offset]== start * of what we care about) * frame_data * : frame data (whole packet with extra info) * proto_tree * : tree of display data. May be NULL. * * Output: * void, but we will add to the proto_tree if it is not NULL. */ static void dissect_isis(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) { isis_hdr_t *ihdr; proto_item *ti; proto_tree *isis_tree = NULL; int id_length; OLD_CHECK_DISPLAY_AS_DATA(proto_isis, pd, offset, fd, tree); if (check_col(fd, COL_PROTOCOL)) col_add_str(fd, COL_PROTOCOL, "ISIS"); if (!BYTES_ARE_IN_FRAME(offset, sizeof(*ihdr))) { isis_dissect_unknown(offset, sizeof(*ihdr), tree, fd, "not enough capture data for header (%d vs %d)", sizeof(*ihdr), END_OF_FRAME); return; } ihdr = (isis_hdr_t *) &pd[offset]; if (ihdr->isis_version != ISIS_REQUIRED_VERSION){ isis_dissect_unknown(offset, END_OF_FRAME, tree, fd, "Unknown ISIS version (%d vs %d)", ihdr->isis_version, ISIS_REQUIRED_VERSION ); return; } if (tree) { ti = proto_tree_add_item(tree, proto_isis, NullTVB, offset, END_OF_FRAME, FALSE ); isis_tree = proto_item_add_subtree(ti, ett_isis); proto_tree_add_uint(isis_tree, hf_isis_irpd, NullTVB, offset, 1, ihdr->isis_irpd ); proto_tree_add_uint(isis_tree, hf_isis_header_length, NullTVB, offset + 1, 1, ihdr->isis_header_length ); proto_tree_add_uint(isis_tree, hf_isis_version, NullTVB, offset + 2, 1, ihdr->isis_version ); proto_tree_add_uint(isis_tree, hf_isis_system_id_length, NullTVB, offset + 3, 1, ihdr->isis_system_id_len ); proto_tree_add_uint_format(isis_tree, hf_isis_type, NullTVB, offset + 4, 1, ihdr->isis_type, "Type : %s (R:%s%s%s)", val_to_str(ihdr->isis_type & ISIS_TYPE_MASK, isis_vals, "Unknown (0x%x)"), (ihdr->isis_type & ISIS_R8_MASK) ? "1" : "0", (ihdr->isis_type & ISIS_R7_MASK) ? "1" : "0", (ihdr->isis_type & ISIS_R6_MASK) ? "1" : "0"); proto_tree_add_uint(isis_tree, hf_isis_version2, NullTVB, offset + 5, 1, ihdr->isis_version2 ); proto_tree_add_uint(isis_tree, hf_isis_reserved, NullTVB, offset + 6, 1, ihdr->isis_reserved ); proto_tree_add_uint(isis_tree, hf_isis_max_area_adr, NullTVB, offset + 7, 1, ihdr->isis_max_area_adr ); } /* * Let us make sure we use the same names for all our decodes * here. First, dump the name into info column, and THEN * dispatch the sub-type. */ if (check_col(fd, COL_INFO)) { col_add_str(fd, COL_INFO, val_to_str ( ihdr->isis_type&ISIS_TYPE_MASK, isis_vals, "Unknown (0x%x)" ) ); } /* * Interpret the system ID length. */ id_length = ihdr->isis_system_id_len; if (id_length == 0) id_length = 6; /* zero means 6-octet ID field length */ else if (id_length == 255) { id_length = 0; /* 255 means null ID field */ /* XXX - what about the LAN ID? */ } /* XXX - otherwise, must be in the range 1 through 8 */ /* * Advance offset (we are past the header). */ offset += sizeof(*ihdr); switch (ihdr->isis_type) { case ISIS_TYPE_L1_HELLO: isis_dissect_isis_hello(ISIS_TYPE_L1_HELLO, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; case ISIS_TYPE_L2_HELLO: isis_dissect_isis_hello(ISIS_TYPE_L2_HELLO, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; case ISIS_TYPE_PTP_HELLO: isis_dissect_isis_hello(ISIS_TYPE_PTP_HELLO, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; case ISIS_TYPE_L1_LSP: isis_dissect_isis_lsp(ISIS_TYPE_L1_LSP, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; case ISIS_TYPE_L2_LSP: isis_dissect_isis_lsp(ISIS_TYPE_L2_LSP, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; case ISIS_TYPE_L1_CSNP: isis_dissect_isis_csnp(ISIS_TYPE_L1_CSNP, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; case ISIS_TYPE_L2_CSNP: isis_dissect_isis_csnp(ISIS_TYPE_L2_CSNP, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; case ISIS_TYPE_L1_PSNP: isis_dissect_isis_psnp(ISIS_TYPE_L1_PSNP, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; case ISIS_TYPE_L2_PSNP: isis_dissect_isis_psnp(ISIS_TYPE_L2_PSNP, ihdr->isis_header_length, id_length, pd, offset, fd, isis_tree); break; default: isis_dissect_unknown(offset, END_OF_FRAME, tree, fd, "unknown ISIS packet type" ); } } /* dissect_isis */ /* * Name: proto_register_isis() * * Description: * main register for isis protocol set. We register some display * formats and the protocol module variables. * * NOTE: this procedure to autolinked by the makefile process that * builds register.c * * Input: * void * * Output: * void */ void proto_register_isis(void) { static hf_register_info hf[] = { { &hf_isis_irpd, { "Intra Domain Routing Protocol Discriminator", "isis.irpd", FT_UINT8, BASE_HEX, VALS(nlpid_vals), 0x0, "" }}, { &hf_isis_header_length, { "PDU Header Length ", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_isis_version, { "Version (==1) ", "isis.version", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_isis_system_id_length, { "System ID Length ", "isis.sysid_len", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_isis_type, { "PDU Type :", "isis.type", FT_UINT8, BASE_DEC, VALS(isis_vals), 0xff, "" }}, { &hf_isis_version2, { "Version2 (==1) ", "isis.version2", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_isis_reserved, { "Reserved (==0) ", "isis.reserved", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, { &hf_isis_max_area_adr, { "Max.AREAs: (0==3) ", "isis.max_area_adr", FT_UINT8, BASE_DEC, NULL, 0x0, "" }}, }; /* * Note, we pull in the unknown CLV handler here, since it * is used by all ISIS packet types. */ static gint *ett[] = { &ett_isis, }; proto_isis = proto_register_protocol(PROTO_STRING_ISIS, "isis"); proto_register_field_array(proto_isis, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_isis(void) { old_dissector_add("osinl", NLPID_ISO10589_ISIS, dissect_isis); }