/* packet-isis.c * Routines for ISO/OSI network and transport protocol packet disassembly, core * bits. * * $Id: packet-isis.c,v 1.25 2001/07/02 02:09:26 guy 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 * tvbuff_t * : tvbuffer for packet data * packet_info * : info for current packet * proto_tree * : tree of display data. May be NULL. * int : current offset into packet data * char * : format text * * Output: * void (may modify proto tree) */ void isis_dissect_unknown(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, char *fmat, ...) { va_list ap; va_start(ap, fmat); proto_tree_add_text_valist(tree, tvb, offset, tvb_length_remaining(tvb, offset), 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: * tvbuff_t * : tvbuffer for packet data * packet_info * : info for current packet * 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(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_item *ti; proto_tree *isis_tree = NULL; int offset = 0; guint8 isis_version; guint8 isis_header_length; guint8 isis_type_reserved; guint8 isis_type; guint8 isis_system_id_len; if (check_col(pinfo->fd, COL_PROTOCOL)) col_set_str(pinfo->fd, COL_PROTOCOL, "ISIS"); if (check_col(pinfo->fd, COL_INFO)) col_clear(pinfo->fd, COL_INFO); isis_version = tvb_get_guint8(tvb, 2); if (isis_version != ISIS_REQUIRED_VERSION){ if (check_col(pinfo->fd, COL_INFO)) { col_add_fstr(pinfo->fd, COL_INFO, "Unknown ISIS version (%u vs %u)", isis_version, ISIS_REQUIRED_VERSION ); } isis_dissect_unknown(tvb, pinfo, tree, 0, "Unknown ISIS version (%d vs %d)", isis_version, ISIS_REQUIRED_VERSION); return; } isis_header_length = tvb_get_guint8(tvb, 1); if (tree) { ti = proto_tree_add_item(tree, proto_isis, tvb, 0, tvb_length(tvb), FALSE ); isis_tree = proto_item_add_subtree(ti, ett_isis); } if (tree) { proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1, FALSE ); } offset += 1; if (tree) { proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb, offset, 1, isis_header_length ); } offset += 1; if (tree) { proto_tree_add_uint(isis_tree, hf_isis_version, tvb, offset, 1, isis_version ); } offset += 1; isis_system_id_len = tvb_get_guint8(tvb, 3); if (tree) { proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb, offset, 1, isis_system_id_len ); } offset += 1; isis_type_reserved = tvb_get_guint8(tvb, 4); isis_type = isis_type_reserved & ISIS_TYPE_MASK; if (check_col(pinfo->fd, COL_INFO)) { col_add_str(pinfo->fd, COL_INFO, val_to_str ( isis_type, isis_vals, "Unknown (0x%x)" ) ); } if (tree) { proto_tree_add_uint_format(isis_tree, hf_isis_type, tvb, offset, 1, isis_type, "PDU Type : %s (R:%s%s%s)", val_to_str(isis_type, isis_vals, "Unknown (0x%x)"), (isis_type_reserved & ISIS_R8_MASK) ? "1" : "0", (isis_type_reserved & ISIS_R7_MASK) ? "1" : "0", (isis_type_reserved & ISIS_R6_MASK) ? "1" : "0"); } offset += 1; if (tree) { proto_tree_add_item(isis_tree, hf_isis_version2, tvb, 5, 1, FALSE ); } offset += 1; if (tree) { proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, 6, 1, FALSE ); } offset += 1; if (tree) { proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, 7, 1, FALSE ); } offset += 1; /* * Interpret the system ID length. */ if (isis_system_id_len == 0) isis_system_id_len = 6; /* zero means 6-octet ID field length */ else if (isis_system_id_len == 255) { isis_system_id_len = 0; /* 255 means null ID field */ /* XXX - what about the LAN ID? */ } /* XXX - otherwise, must be in the range 1 through 8 */ switch (isis_type) { case ISIS_TYPE_L1_HELLO: case ISIS_TYPE_L2_HELLO: case ISIS_TYPE_PTP_HELLO: isis_dissect_isis_hello(tvb, pinfo, isis_tree, offset, isis_type, isis_header_length, isis_system_id_len); break; case ISIS_TYPE_L1_LSP: case ISIS_TYPE_L2_LSP: isis_dissect_isis_lsp(tvb, pinfo, isis_tree, offset, isis_type, isis_header_length, isis_system_id_len); break; case ISIS_TYPE_L1_CSNP: case ISIS_TYPE_L2_CSNP: isis_dissect_isis_csnp(tvb, pinfo, isis_tree, offset, isis_type, isis_header_length, isis_system_id_len); break; case ISIS_TYPE_L1_PSNP: case ISIS_TYPE_L2_PSNP: isis_dissect_isis_psnp(tvb, pinfo, isis_tree, offset, isis_type, isis_header_length, isis_system_id_len); break; default: isis_dissect_unknown(tvb, pinfo, tree, offset, "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, "", HFILL }}, { &hf_isis_header_length, { "PDU Header Length ", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_isis_version, { "Version (==1) ", "isis.version", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_isis_system_id_length, { "System ID Length ", "isis.sysid_len", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_isis_type, { "PDU Type ", "isis.type", FT_UINT8, BASE_DEC, VALS(isis_vals), 0xff, "", HFILL }}, { &hf_isis_version2, { "Version2 (==1) ", "isis.version2", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_isis_reserved, { "Reserved (==0) ", "isis.reserved", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_isis_max_area_adr, { "Max.AREAs: (0==3) ", "isis.max_area_adr", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, }; /* * 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", "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) { dissector_add("osinl", NLPID_ISO10589_ISIS, dissect_isis, proto_isis); }