diff options
author | Anders Broman <anders.broman@ericsson.com> | 2009-03-03 20:07:38 +0000 |
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committer | Anders Broman <anders.broman@ericsson.com> | 2009-03-03 20:07:38 +0000 |
commit | 2222ecef6e3513e3b736e53ee0d3d8f02ebc0a2e (patch) | |
tree | 22ca2b4a85d05c66d101196e1510a7cb7d980719 /epan/dissectors | |
parent | 981c54cd352f165b7f807b216d79fd7783c408ab (diff) |
Artem Tamazov:
Introduction of decoding of MPLS payloads as HDLC PW (RFC4618)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3297
svn path=/trunk/; revision=27591
Diffstat (limited to 'epan/dissectors')
-rw-r--r-- | epan/dissectors/Makefile.common | 1 | ||||
-rw-r--r-- | epan/dissectors/packet-pw-hdlc.c | 263 |
2 files changed, 264 insertions, 0 deletions
diff --git a/epan/dissectors/Makefile.common b/epan/dissectors/Makefile.common index 95df9556dd..38fed11746 100644 --- a/epan/dissectors/Makefile.common +++ b/epan/dissectors/Makefile.common @@ -695,6 +695,7 @@ DISSECTOR_SRC = \ packet-ptp.c \ packet-pvfs2.c \ packet-pw-eth.c \ + packet-pw-hdlc.c \ packet-q2931.c \ packet-q931.c \ packet-q933.c \ diff --git a/epan/dissectors/packet-pw-hdlc.c b/epan/dissectors/packet-pw-hdlc.c new file mode 100644 index 0000000000..065446e919 --- /dev/null +++ b/epan/dissectors/packet-pw-hdlc.c @@ -0,0 +1,263 @@ +/* packet-pw-hdlc.c + * Routines for HDLC PW dissection as per RFC4618. + * Copyright 2009, Dmitry Trebich, Artem Tamazov <artem.tamazov@tellabs.com> + * + * $Id$ + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * 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. + * + * History: + * --------------------------------- + * 02.03.2009 Initial implementation, supports: + * - HDLC mode (rfc4618 5.1), no CW, payload is PPP (PPP in HDLC-like Framing (rfc1662)). + * - FR port mode (rfc4618 5.2), no CW. + * + * [informative: Not supported yet: + * - All kinds of HDLC PW with CW. + * - PPP mode (rfc4618 5.3). + * - For HDLC mode, decoding payloads other than PPP.] + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <glib.h> +#include <epan/packet.h> + +#include "packet-mpls.h" + +static gint proto_pw_hdlc_nocw_fr = -1; +static gint proto_pw_hdlc_nocw_hdlc_ppp = -1; + +static gint ett_pw_hdlc = -1; + +static int hf_pw_hdlc = -1; +static int hf_pw_hdlc_address_field = -1; +static int hf_pw_hdlc_address = -1; +static int hf_pw_hdlc_cr_bit = -1; +static int hf_pw_hdlc_control_field = -1; +static int hf_pw_hdlc_pf_bit = -1; + +static hf_register_info hf[] = { + { + &hf_pw_hdlc, + { + "PW HDLC", "pw_hdlc", FT_NONE, 0, NULL, 0x0, NULL, HFILL + } + }, + { + &hf_pw_hdlc_address_field, + { + "Address field", "pw_hdlc.address_field", + FT_UINT8, BASE_HEX, NULL, 0x0, "Address field", HFILL + } + }, + { + &hf_pw_hdlc_address, + { + "Address", "pw_hdlc.address", + FT_UINT8, BASE_HEX, NULL, 0x0, "Address", HFILL + } + }, + { + &hf_pw_hdlc_cr_bit, + { + "C/R bit", "pw_hdlc.cr_bit", + FT_UINT8, BASE_DEC, NULL, 0x0, "C/R bit", HFILL + } + }, + { + &hf_pw_hdlc_control_field, + { + "Control field", "pw_hdlc.control_field", + FT_UINT8, BASE_HEX, NULL, 0x0, "Control field", HFILL + } + }, + { + &hf_pw_hdlc_pf_bit, + { + "Poll/Final bit", "pw_hdlc.pf_bit", + FT_UINT8, BASE_DEC, NULL, 0x0, "Poll/Final bit", HFILL + } + } +}; + +static gint *ett[] = { + &ett_pw_hdlc +}; + +static void dissect_pw_hdlc_nocw_fr( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree ) +{ + call_dissector( find_dissector( "fr" ), tvb, pinfo, tree ); +} + + +static void dissect_pw_hdlc_nocw_hdlc_ppp( tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree ) +{ + if (tvb_reported_length_remaining(tvb, 0) < 2) + { + if (tree) + { + proto_tree_add_text(tree, tvb, 0, -1, "Error processing message"); + } + return; + } + + if (tree) + { + proto_tree *tr; + proto_item *item; + proto_item *item_address; + proto_item *item_control; + guint8 address; + guint8 control; + + address = tvb_get_guint8(tvb, 0); + control = tvb_get_guint8(tvb, 1); + + item = proto_tree_add_item( tree, proto_pw_hdlc_nocw_hdlc_ppp, tvb, 0, 2, FALSE ); + + tr = proto_item_add_subtree( item, ett_pw_hdlc ); + + item_address = proto_tree_add_uint( tr, hf_pw_hdlc_address_field, tvb, 0, 1, address ); + item_control = proto_tree_add_uint_format( tr, hf_pw_hdlc_control_field, tvb, 1, 1, control, "Control field: 0x%x", control ); + + tr = proto_item_add_subtree( item_address, ett_pw_hdlc ); + + if ( 0x3F == (( address & 0xFC ) >> 2 )) + proto_tree_add_uint_format( tr, hf_pw_hdlc_address, tvb, 0, 1, 0xFC, "Address: 0x%x (All stations)", 0x3F ); + else + proto_tree_add_uint( tr, hf_pw_hdlc_address, tvb, 0, 1, ( address & 0xFC ) >> 2 ); + + proto_tree_add_uint( tr, hf_pw_hdlc_cr_bit, tvb, 0, 1, ( address & 2 ) >> 1 ); + + tr = proto_item_add_subtree( item_control, ett_pw_hdlc ); + + if ( control & 1 ) + { + if ( control & 2 ) + { + guint8 modifier2; + guint8 modifier3; + + proto_tree_add_text( tr, tvb, 1, 1, "U frame" ); + + proto_tree_add_uint( tr, hf_pw_hdlc_pf_bit, tvb, 1, 1, ( control & 0x10 ) >> 4 ); + + modifier2 = (( control & 0xC ) >> 2 ); + modifier3 = (( control & 0xE0 ) >> 5 ); + + /**/ if ( modifier2 == 0 && modifier3 == 0 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: UI - Unnumbered information" ); + else if ( modifier2 == 0 && modifier3 == 1 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: UP - Unnumbered poll" ); + else if ( modifier2 == 0 && modifier3 == 2 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: DISC/RD - Disconnect/Request disconnect" ); + else if ( modifier2 == 0 && modifier3 == 3 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: UA - Unnumbered acknowledgment" ); + else if ( modifier2 == 0 && modifier3 == 4 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: SNRM - Set normal response mode" ); + else if ( modifier2 == 0 && modifier3 == 7 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: TEST - Test" ); + else if ( modifier2 == 1 && modifier3 == 0 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: SIM/RIM" + " - Set initialization mode/Request initialization mode" ); + else if ( modifier2 == 1 && modifier3 == 4 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: FRMR - Frame reject" ); + else if ( modifier2 == 3 && modifier3 == 0 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: SARM/DM" + " - Set asynchronous response mode/Disconnect mode" ); + else if ( modifier2 == 3 && modifier3 == 1 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: SABM - Set asynchronous balanced mode" ); + else if ( modifier2 == 3 && modifier3 == 2 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: SARME - Set asynchronous response extended mode" ); + else if ( modifier2 == 3 && modifier3 == 3 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: SABME - Set asynchronous balanced extended mode" ); + else if ( modifier2 == 3 && modifier3 == 4 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: RSET - Reset" ); + else if ( modifier2 == 3 && modifier3 == 5 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: XID - Exchange identification" ); + else if ( modifier2 == 3 && modifier3 == 6 ) + proto_tree_add_text( tr, tvb, 1, 1, + "Modifier: SNRME - Set normal response extended mode" ); + } + else + { + proto_tree_add_text( tr, tvb, 1, 1, "S frame" ); + } + } + else + { + proto_tree_add_text( tr, tvb, 1, 1, "I frame" ); + } + } + call_dissector( find_dissector( "ppp" ), tvb_new_subset(tvb, 2, -1, -1), pinfo, tree ); +} + +void proto_register_pw_hdlc(void) +{ + proto_pw_hdlc_nocw_fr = proto_register_protocol("HDLC PW, FR port mode (no CW)", /*not displayed*/ + "HDLC PW, FR port mode (no CW)", + "pw_hdlc_nocw_fr" ); + proto_pw_hdlc_nocw_hdlc_ppp = proto_register_protocol("HDLC-like framing for PPP", + "HDLC PW with PPP payload (no CW)", + "pw_hdlc_nocw_hdlc_ppp" ); + + proto_register_field_array(proto_pw_hdlc_nocw_fr, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + register_dissector("pw_hdlc_nocw_fr", dissect_pw_hdlc_nocw_fr, proto_pw_hdlc_nocw_fr ); + register_dissector("pw_hdlc_nocw_hdlc_ppp", dissect_pw_hdlc_nocw_hdlc_ppp, proto_pw_hdlc_nocw_hdlc_ppp ); +} + +void proto_reg_handoff_pw_hdlc(void) +{ + static gboolean initialized=FALSE; + + if ( !initialized ) + { + dissector_handle_t handle; + + handle = find_dissector("pw_hdlc_nocw_fr"); + dissector_add( "mpls.label", LABEL_INVALID, handle ); + + handle = find_dissector("pw_hdlc_nocw_hdlc_ppp"); + dissector_add( "mpls.label", LABEL_INVALID, handle ); + + initialized = TRUE; + } +}
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