/* packet-pw-oam.c * * Routines for Pseudowire Status for static pseudowires : RFC 6478 * * (c) Copyright 2012, Krishnamurthy Mayya * Nikitha Malgi * * 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. */ #include "config.h" #include void proto_register_pw_oam(void); void proto_reg_handoff_pw_oam(void); /* MPLS-TP FM protocol specific variables */ static gint proto_pw_oam = -1; static gint ett_pw_oam = -1; static gint ett_pw_oam_flags = -1; static gint ett_pw_oam_tlv_tree = -1; static int hf_pw_oam_tlv_reserved = -1; static int hf_pw_oam_tlv_type = -1; static int hf_pw_oam_total_tlv_len = -1; static int hf_pw_oam_code = -1; static int hf_pw_oam_flags = -1; static int hf_pw_oam_flags_a = -1; static int hf_pw_oam_refresh_timer = -1; static int hf_pw_oam_tlv_len = -1; static const value_string pw_oam_code[] = { {0x00000002, "Local Attachment Circuit(ingress) Receive Fault"}, {0x00000004, "Local Attachment Circuit(egress) Transmit Fault"}, {0x00000020, "PW Forwarding Standby"}, {0x00000040, "Request Switchover to this PW"}, {0, NULL} }; /* PW-Status TLV dissector */ static void dissect_pw_status_tlv (tvbuff_t *tvb, proto_tree *tree, gint offset) { proto_item *ti; proto_tree *pw_oam_tlv_tree; ti = proto_tree_add_protocol_format (tree, proto_pw_oam, tvb, offset, 8, "Pseudo-Wire Status TLV"); if (!tree) return; pw_oam_tlv_tree = proto_item_add_subtree (ti, ett_pw_oam_tlv_tree); proto_tree_add_item (pw_oam_tlv_tree, hf_pw_oam_tlv_reserved, tvb, offset, 2, ENC_BIG_ENDIAN); proto_tree_add_item (pw_oam_tlv_tree, hf_pw_oam_tlv_type, tvb, offset, 2, ENC_BIG_ENDIAN); offset = offset + 2; proto_tree_add_item (pw_oam_tlv_tree, hf_pw_oam_tlv_len, tvb, offset, 2, ENC_BIG_ENDIAN); offset = offset + 2; proto_tree_add_item (pw_oam_tlv_tree, hf_pw_oam_code, tvb, offset, 4, ENC_BIG_ENDIAN); /*offset = offset + 4;*/ return ; } /* Dissector for PW OAM protocol: RFC 6478 */ static int dissect_pw_oam(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_item *ti = NULL, *ti_flags = NULL; proto_tree *pw_oam_tree = NULL, *pw_oam_flags = NULL; guint8 offset = 0; guint16 pw_tlv_type = 0; col_set_str(pinfo->cinfo, COL_PROTOCOL, "PW OAM"); col_clear(pinfo->cinfo, COL_INFO); if (!tree) return tvb_captured_length(tvb); ti = proto_tree_add_item(tree, proto_pw_oam, tvb, 0, -1, ENC_NA); pw_oam_tree = proto_item_add_subtree (ti, ett_pw_oam); /* Refresh-Timer field */ proto_tree_add_item (pw_oam_tree, hf_pw_oam_refresh_timer, tvb, offset, 2, ENC_BIG_ENDIAN); offset = offset + 2; /* Total-TLV length */ proto_tree_add_item (pw_oam_tree, hf_pw_oam_total_tlv_len, tvb, offset, 1, ENC_BIG_ENDIAN); offset = offset + 1; /* Flags field */ ti_flags = proto_tree_add_item (pw_oam_tree, hf_pw_oam_flags, tvb, offset, 1, ENC_BIG_ENDIAN); pw_oam_flags = proto_item_add_subtree(ti_flags, ett_pw_oam_flags); proto_tree_add_item (pw_oam_flags, hf_pw_oam_flags_a, tvb, offset, 1, ENC_BIG_ENDIAN); offset = offset + 1; pw_tlv_type = tvb_get_ntohs (tvb, offset); /* TLVs */ switch (pw_tlv_type) { /* The switch cases below have to be based on the LDP-name space. http://www.iana.org/assignments/ldp-namespaces/ldp-namespaces.xml */ case 0x096A: /* PW-Status TLV */ dissect_pw_status_tlv (tvb, tree, offset); break; default: break; } return tvb_captured_length(tvb); } void proto_register_pw_oam(void) { static hf_register_info hf[] = { {&hf_pw_oam_refresh_timer, {"Refresh-Timer", "pw_oam.refresh-timer", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }}, {&hf_pw_oam_total_tlv_len, {"TLV Length", "pw_oam.total-tlv-len", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }}, {&hf_pw_oam_flags, {"Flags", "pw_oam.flags", FT_UINT8, BASE_HEX, NULL, 0x0000, "OAM Flags", HFILL }}, {&hf_pw_oam_flags_a, {"Acknowledgement", "pw_oam.flags_a", FT_BOOLEAN, 8, NULL, 0x0080, "ACK bit", HFILL} }, {&hf_pw_oam_tlv_reserved, {"Reserved", "pw_oam.tlv-reserved", FT_UINT16, BASE_HEX, NULL, 0xC000, NULL, HFILL} }, {&hf_pw_oam_tlv_type, {"TLV Type", "pw_oam.tlv-type", FT_UINT16, BASE_HEX, NULL, 0x3FFF, NULL, HFILL} }, {&hf_pw_oam_tlv_len, {"TLV Length", "pw_oam.tlv-len", FT_UINT16, BASE_HEX, NULL, 0x00, NULL, HFILL} }, {&hf_pw_oam_code, {"Status code", "pw_oam.code", FT_UINT16, BASE_HEX, VALS(pw_oam_code), 0x0, "PW Status Code", HFILL } }, }; static gint *ett[] = { &ett_pw_oam, &ett_pw_oam_tlv_tree, &ett_pw_oam_flags, }; proto_pw_oam = proto_register_protocol("Pseudo-Wire OAM", "PW-OAM " "Pseudo-Wire OAM Protocol", "pw_oam"); proto_register_field_array (proto_pw_oam, hf, array_length(hf)); proto_register_subtree_array (ett, array_length(ett)); } void proto_reg_handoff_pw_oam(void) { dissector_handle_t pw_oam_handle; pw_oam_handle = create_dissector_handle( dissect_pw_oam, proto_pw_oam ); dissector_add_uint("pwach.channel_type", 0x0027, pw_oam_handle); /* KM: MPLSTP PW-OAM, RFC 6478 */ } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 2 * tab-width: 8 * indent-tabs-mode: nil * End: * * vi: set shiftwidth=2 tabstop=8 expandtab: * :indentSize=2:tabSize=8:noTabs=true: */