forked from osmocom/wireshark
![Michael Mann](/assets/img/avatar_default.png)
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
931 lines
28 KiB
C
931 lines
28 KiB
C
/* packet-llc.c
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* Routines for IEEE 802.2 LLC layer
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* Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/capture_dissectors.h>
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#include <wiretap/wtap.h>
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#include <wsutil/pint.h>
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#include <epan/oui.h>
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#include <epan/xdlc.h>
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#include <epan/etypes.h>
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#include <epan/llcsaps.h>
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#include <epan/bridged_pids.h>
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#include <epan/ppptypes.h>
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#include <epan/arcnet_pids.h>
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#include "packet-fc.h"
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#include "packet-ip.h"
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#include "packet-ipx.h"
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#include "packet-netbios.h"
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#include "packet-sll.h"
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#include "packet-juniper.h"
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#include "packet-llc.h"
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void proto_register_basicxid(void);
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void proto_register_llc(void);
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void proto_reg_handoff_llc(void);
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#define UDP_PORT_LLC1 12000
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#define UDP_PORT_LLC2 12001
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#define UDP_PORT_LLC3 12002
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#define UDP_PORT_LLC4 12003
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#define UDP_PORT_LLC5 12004
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static int proto_llc = -1;
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static int hf_llc_dsap = -1;
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static int hf_llc_ssap = -1;
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static int hf_llc_dsap_sap = -1;
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static int hf_llc_dsap_ig = -1;
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static int hf_llc_ssap_sap = -1;
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static int hf_llc_ssap_cr = -1;
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static int hf_llc_ctrl = -1;
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static int hf_llc_n_r = -1;
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static int hf_llc_n_s = -1;
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static int hf_llc_p = -1;
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static int hf_llc_p_ext = -1;
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static int hf_llc_f = -1;
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static int hf_llc_f_ext = -1;
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static int hf_llc_s_ftype = -1;
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static int hf_llc_u_modifier_cmd = -1;
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static int hf_llc_u_modifier_resp = -1;
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static int hf_llc_ftype_i = -1;
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static int hf_llc_ftype_s_u = -1;
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static int hf_llc_ftype_s_u_ext = -1;
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static int hf_llc_type = -1;
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static int hf_llc_oui = -1;
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static int hf_llc_pid = -1;
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static int proto_basicxid = -1;
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static int hf_llc_xid_format = -1;
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static int hf_llc_xid_types = -1;
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static int hf_llc_xid_wsize = -1;
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static gint ett_llc = -1;
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static gint ett_llc_dsap = -1;
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static gint ett_llc_ssap = -1;
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static gint ett_llc_ctrl = -1;
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static gint ett_llc_basicxid = -1;
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static dissector_table_t dsap_subdissector_table;
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static dissector_table_t xid_subdissector_table;
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static dissector_table_t ethertype_subdissector_table;
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static dissector_table_t hpteam_subdissector_table;
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static dissector_handle_t bpdu_handle;
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static dissector_handle_t eth_withoutfcs_handle;
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static dissector_handle_t eth_withfcs_handle;
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static dissector_handle_t fddi_handle;
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static dissector_handle_t tr_handle;
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static dissector_handle_t turbo_handle;
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static dissector_handle_t mesh_handle;
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/*
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* Group/Individual bit, in the DSAP.
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*/
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#define DSAP_GI_BIT 0x01
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/*
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* Command/Response bit, in the SSAP.
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*
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* The low-order bit of the SSAP apparently determines whether this
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* is a request or a response. (RFC 1390, "Transmission of IP and
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* ARP over FDDI Networks", says
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*
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* Command frames are identified by having the low order
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* bit of the SSAP address reset to zero. Response frames
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* have the low order bit of the SSAP address set to one.
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*
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* and a page I've seen seems to imply that's part of 802.2.)
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*/
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#define SSAP_CR_BIT 0x01
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/*
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* Mask to extrace the SAP number from the DSAP or the SSAP.
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*/
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#define SAP_MASK 0xFE
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/*
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* These are for SSAP and DSAP, wth last bit always zero.
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* XXX - some DSAPs come in separate "individual" and "group" versions,
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* with the last bit 0 and 1, respectively (e.g., LLC Sub-layer Management,
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* IBM SNA Path Control, IBM Net Management), but, whilst 0xFE is
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* the ISO Network Layer Protocol, 0xFF is the Global LSAP.
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*/
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const value_string sap_vals[] = {
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{ SAP_NULL, "NULL LSAP" },
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{ SAP_NULL+1, "NULL LSAP" },
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{ SAP_LLC_SLMGMT, "LLC Sub-Layer Management" },
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{ SAP_SNA_PATHCTRL, "SNA Path Control" },
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{ SAP_IP, "TCP/IP" },
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{ SAP_SNA1, "SNA" },
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{ SAP_SNA2, "SNA" },
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{ SAP_PROWAY_NM_INIT, "PROWAY (IEC955) Network Management and Initialization" },
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{ SAP_NETWARE1, "NetWare (unofficial?)" },
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{ SAP_OSINL1, "ISO Network Layer (OSLAN 1)" },
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{ SAP_TI, "Texas Instruments" },
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{ SAP_OSINL2, "ISO Network Layer (unofficial?)" },
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{ SAP_OSINL3, "ISO Network Layer (unofficial?)" },
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{ SAP_BPDU, "Spanning Tree BPDU" },
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{ SAP_RS511, "EIA RS-511 Manufacturing Message Service" },
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{ SAP_OSINL4, "ISO Network Layer (OSLAN 2)" },
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{ SAP_X25, "ISO 8208 (X.25 over 802.2)" },
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/*
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* XXX - setting the group bit of SAP_X25 make 0x7F; is this just
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* a group version of that?
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*/
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{ 0x7F, "ISO 802.2" },
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{ SAP_XNS, "XNS" },
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{ SAP_BACNET, "BACnet" },
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{ SAP_NESTAR, "Nestar" },
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{ SAP_PROWAY_ASLM, "PROWAY (IEC955) Active Station List Maintenance" },
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{ SAP_ARP, "ARP" }, /* XXX - hand to "dissect_arp()"? */
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{ SAP_HPJD, "HP JetDirect Printer" },
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{ SAP_SNAP, "SNAP" },
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{ SAP_VINES1, "Banyan Vines" },
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{ SAP_VINES2, "Banyan Vines" },
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{ SAP_NETWARE2, "NetWare" },
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{ SAP_NETBIOS, "NetBIOS" },
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{ SAP_IBMNM, "IBM Net Management" },
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{ SAP_HPEXT, "HP Extended LLC" },
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{ SAP_UB, "Ungermann-Bass" },
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{ SAP_RPL, "Remote Program Load" },
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{ SAP_OSINL5, "ISO Network Layer" },
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{ SAP_GLOBAL, "Global LSAP" },
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{ 0x00, NULL }
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};
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static const value_string format_vals[] = {
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{ 0x81, "LLC basic format" },
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{ 0, NULL }
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};
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/*
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* Mask to extract the type from XID frame.
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*/
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#define TYPES_MASK 0x1F
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static const value_string type_vals[] = {
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{ 1, "Type 1 LLC (Class I LLC)" },
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{ 2, "Type 2 LLC" },
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{ 3, "Type 1 and Type 2 LLCs (Class II LLC)" },
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{ 4, "Type 3 LLC" },
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{ 5, "Type 1 and Type 3 LLCs (Class III LLC)" },
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{ 6, "Type 2 and Type 3 LLCs" },
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{ 7, "Type 1 and Type 2 and Type 3 LLCs (Class IV LLC)" },
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{ 0, NULL }
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};
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/*
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* Hash table for translating OUIs to an oui_info_t.
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*/
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static GHashTable *oui_info_table = NULL;
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/*
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* Decode the SAP value as a bitfield into a string, skipping the GI/CR bit.
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* Ordinarily, this could be done easily by specifying a bitmask in the
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* corresponding hf_ entry for the DSAP/SSAP value and simply using a
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* proto_tree_add_... function to add the item into a proto tree. The
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* problem is that the proto_tree_add_... functions always bitshift the
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* value if a bitmask is specified. A SAP value always comprises the entire
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* octet, however, and must not be shifted. Therefore, using a simple
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* proto_tree_add_... function to display the topmost 7 bits of the SAP
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* value as a bitfield produces incorrect results (while the bitfield is
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* displayed correctly, Wireshark uses the bitshifted value to display the
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* associated name and for filtering purposes). This function calls a
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* BASE_CUSTOM routine to decode the SAP value as a bitfield
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* counter-balancing the bitshift of the original value.
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*/
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static void
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llc_sap_value( gchar *result, guint32 sap )
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{
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g_snprintf( result, ITEM_LABEL_LENGTH, "%s", val_to_str_const(sap<<1, sap_vals, "Unknown"));
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}
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/*
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* Add an entry for a new OUI.
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*/
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void
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llc_add_oui(guint32 oui, const char *table_name, const char *table_ui_name,
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hf_register_info *hf_item, const int proto)
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{
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oui_info_t *new_info;
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new_info = (oui_info_t *)g_malloc(sizeof (oui_info_t));
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new_info->table = register_dissector_table(table_name,
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table_ui_name, proto, FT_UINT16, BASE_HEX, DISSECTOR_TABLE_ALLOW_DUPLICATE);
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new_info->field_info = hf_item;
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/*
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* Create the hash table for OUI information, if it doesn't
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* already exist.
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*/
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if (oui_info_table == NULL) {
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oui_info_table = g_hash_table_new(g_direct_hash,
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g_direct_equal);
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}
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g_hash_table_insert(oui_info_table, GUINT_TO_POINTER(oui), new_info);
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}
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gboolean
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capture_llc(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_) {
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int is_snap;
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guint16 control;
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int llc_header_len;
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if (!BYTES_ARE_IN_FRAME(offset, len, 2))
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return FALSE;
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is_snap = (pd[offset] == SAP_SNAP) && (pd[offset+1] == SAP_SNAP);
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llc_header_len = 2; /* DSAP + SSAP */
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/*
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* XXX - the page referred to in the comment above about the
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* Command/Response bit also implies that LLC Type 2 always
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* uses extended operation, so we don't need to determine
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* whether it's basic or extended operation; is that the case?
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*/
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control = get_xdlc_control(pd, offset+2, pd[offset+1] & SSAP_CR_BIT);
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llc_header_len += XDLC_CONTROL_LEN(control, TRUE);
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if (!BYTES_ARE_IN_FRAME(offset, len, llc_header_len))
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return FALSE;
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if (!XDLC_IS_INFORMATION(control))
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return FALSE;
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if (is_snap)
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return capture_snap(pd, offset+llc_header_len, len, cpinfo, pseudo_header);
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/* non-SNAP */
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return try_capture_dissector("llc.dsap", pd[offset], pd, offset + llc_header_len, len, cpinfo, pseudo_header);
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}
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gboolean
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capture_snap(const guchar *pd, int offset, int len, capture_packet_info_t *cpinfo, const union wtap_pseudo_header *pseudo_header _U_)
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{
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guint32 oui;
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guint16 etype;
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if (!BYTES_ARE_IN_FRAME(offset, len, 5))
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return FALSE;
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oui = pd[offset] << 16 | pd[offset+1] << 8 | pd[offset+2];
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etype = pntoh16(&pd[offset+3]);
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switch (oui) {
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case OUI_ENCAP_ETHER:
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case OUI_CISCO_90:
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case OUI_APPLE_ATALK:
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/* No, I have no idea why Apple used
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one of their own OUIs, rather than
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OUI_ENCAP_ETHER, and an Ethernet
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packet type as protocol ID, for
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AppleTalk data packets - but used
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OUI_ENCAP_ETHER and an Ethernet
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packet type for AARP packets. */
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return try_capture_dissector("ethertype", etype, pd, offset+5, len, cpinfo, pseudo_header);
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case OUI_CISCO:
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return try_capture_dissector("ethertype", etype, pd, offset+5, len, cpinfo, pseudo_header);
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case OUI_MARVELL:
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/*
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* OLPC packet. The PID is an Ethertype, but
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* there's a mesh header between the PID and
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* the payload. (We assume the header is
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* 5 bytes, for now).
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*/
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return try_capture_dissector("ethertype", etype, pd, offset+5+5, len, cpinfo, pseudo_header);
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}
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return FALSE;
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}
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/* Used only for U frames */
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static const xdlc_cf_items llc_cf_items = {
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NULL,
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NULL,
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&hf_llc_p,
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&hf_llc_f,
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NULL,
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&hf_llc_u_modifier_cmd,
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&hf_llc_u_modifier_resp,
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NULL,
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&hf_llc_ftype_s_u
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};
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/* Used only for I and S frames */
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static const xdlc_cf_items llc_cf_items_ext = {
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&hf_llc_n_r,
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&hf_llc_n_s,
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&hf_llc_p_ext,
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&hf_llc_f_ext,
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&hf_llc_s_ftype,
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NULL,
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NULL,
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&hf_llc_ftype_i,
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&hf_llc_ftype_s_u_ext
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};
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static int
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dissect_basicxid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *xid_tree = NULL;
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proto_item *ti = NULL;
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guint8 format, types, wsize;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "XID");
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col_clear(pinfo->cinfo, COL_INFO);
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format = tvb_get_guint8(tvb, 0);
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ti = proto_tree_add_item(tree, proto_basicxid, tvb, 0, -1, ENC_NA);
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xid_tree = proto_item_add_subtree(ti, ett_llc_basicxid);
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proto_tree_add_uint(xid_tree, hf_llc_xid_format, tvb, 0, 1, format);
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col_append_str(pinfo->cinfo, COL_INFO, "Basic Format");
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types = tvb_get_guint8(tvb, 1);
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proto_tree_add_uint(xid_tree, hf_llc_xid_types, tvb, 1,
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1, types & TYPES_MASK);
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"; %s", val_to_str(types & TYPES_MASK, type_vals, "0x%02x")
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);
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wsize = tvb_get_guint8(tvb, 2);
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proto_tree_add_uint(xid_tree, hf_llc_xid_wsize, tvb, 2,
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1, (wsize & 0xFE) >> 1);
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col_append_fstr(pinfo->cinfo, COL_INFO,
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"; Window Size %d", (wsize & 0xFE) >> 1);
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return tvb_captured_length(tvb);
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}
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static int
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dissect_llc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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proto_tree *llc_tree;
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proto_tree *field_tree;
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proto_item *ti, *sap_item;
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int is_snap;
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guint16 control;
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int llc_header_len;
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guint8 dsap, ssap, format;
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tvbuff_t *next_tvb;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "LLC");
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col_clear(pinfo->cinfo, COL_INFO);
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dsap = tvb_get_guint8(tvb, 0);
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ti = proto_tree_add_item(tree, proto_llc, tvb, 0, -1, ENC_NA);
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llc_tree = proto_item_add_subtree(ti, ett_llc);
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sap_item = proto_tree_add_item(llc_tree, hf_llc_dsap, tvb, 0, 1, ENC_BIG_ENDIAN);
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field_tree = proto_item_add_subtree(sap_item, ett_llc_dsap);
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proto_tree_add_item(field_tree, hf_llc_dsap_sap, tvb, 0, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(field_tree, hf_llc_dsap_ig, tvb, 0, 1, ENC_NA);
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ssap = tvb_get_guint8(tvb, 1);
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sap_item = proto_tree_add_item(llc_tree, hf_llc_ssap, tvb, 1, 1, ENC_BIG_ENDIAN);
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field_tree = proto_item_add_subtree(sap_item, ett_llc_ssap);
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proto_tree_add_item(field_tree, hf_llc_ssap_sap, tvb, 1, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(field_tree, hf_llc_ssap_cr, tvb, 1, 1, ENC_NA);
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is_snap = (dsap == SAP_SNAP) && (ssap == SAP_SNAP);
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llc_header_len = 2; /* DSAP + SSAP */
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/*
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* XXX - the page referred to in the comment above about the
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* Command/Response bit also implies that LLC Type 2 always
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* uses extended operation, so we don't need to determine
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* whether it's basic or extended operation; is that the case?
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*/
|
|
control = dissect_xdlc_control(tvb, 2, pinfo, llc_tree,
|
|
hf_llc_ctrl, ett_llc_ctrl,
|
|
&llc_cf_items, &llc_cf_items_ext,
|
|
NULL, NULL, ssap & SSAP_CR_BIT, TRUE, FALSE);
|
|
llc_header_len += XDLC_CONTROL_LEN(control, TRUE);
|
|
if (is_snap)
|
|
llc_header_len += 5; /* 3 bytes of OUI, 2 bytes of protocol ID */
|
|
|
|
if (tree)
|
|
proto_item_set_len(ti, llc_header_len);
|
|
|
|
if (is_snap) {
|
|
dissect_snap(tvb, 2+XDLC_CONTROL_LEN(control, TRUE), pinfo, tree, llc_tree, control,
|
|
hf_llc_oui, hf_llc_type, hf_llc_pid, 2);
|
|
}
|
|
else {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
"; DSAP %s %s, SSAP %s %s",
|
|
val_to_str(dsap & SAP_MASK, sap_vals, "0x%02x"),
|
|
dsap & DSAP_GI_BIT ?
|
|
"Group" : "Individual",
|
|
val_to_str(ssap & SAP_MASK, sap_vals, "0x%02x"),
|
|
ssap & SSAP_CR_BIT ?
|
|
"Response" : "Command"
|
|
);
|
|
|
|
if (tvb_reported_length_remaining(tvb, llc_header_len) > 0) {
|
|
next_tvb = tvb_new_subset_remaining(tvb, llc_header_len);
|
|
if (XDLC_IS_INFORMATION(control)) {
|
|
/*
|
|
* Non-SNAP I or UI frame.
|
|
* Try the regular LLC subdissector table
|
|
* with the DSAP.
|
|
*/
|
|
if (!dissector_try_uint(dsap_subdissector_table,
|
|
dsap, next_tvb, pinfo, tree)) {
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
}
|
|
} else if ((control & (XDLC_U_MODIFIER_MASK|XDLC_U))
|
|
== (XDLC_XID|XDLC_U)) {
|
|
/*
|
|
* Non-SNAP XID frame.
|
|
* Test for LLC basic format first
|
|
*/
|
|
format = tvb_get_guint8(next_tvb, 0);
|
|
if (format == 0x81) {
|
|
dissect_basicxid(next_tvb, pinfo, tree, data);
|
|
} else {
|
|
/*
|
|
* Try the XID LLC subdissector table
|
|
* with the DSAP.
|
|
*/
|
|
if (!dissector_try_uint(
|
|
xid_subdissector_table, dsap, next_tvb,
|
|
pinfo, tree)) {
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
}
|
|
}
|
|
} else {
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
}
|
|
}
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
/*
|
|
* Dissect SNAP header; used elsewhere, e.g. in the Frame Relay dissector.
|
|
*/
|
|
void
|
|
dissect_snap(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree,
|
|
proto_tree *snap_tree, int control, int hf_oui, int hf_type, int hf_pid,
|
|
int bridge_pad)
|
|
{
|
|
guint32 oui;
|
|
guint16 etype;
|
|
tvbuff_t *next_tvb;
|
|
oui_info_t *oui_info;
|
|
dissector_table_t subdissector_table;
|
|
int hf;
|
|
int mesh_header_len;
|
|
|
|
/*
|
|
* XXX - what about non-UI frames?
|
|
*/
|
|
oui = tvb_get_ntoh24(tvb, offset);
|
|
etype = tvb_get_ntohs(tvb, offset+3);
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
"; SNAP, OUI 0x%06X (%s), PID 0x%04X",
|
|
oui, val_to_str_const(oui, oui_vals, "Unknown"), etype);
|
|
|
|
proto_tree_add_uint(snap_tree, hf_oui, tvb, offset, 3, oui);
|
|
|
|
switch (oui) {
|
|
|
|
case OUI_HP_2:
|
|
oui_info = get_snap_oui_info(oui);
|
|
hf = *oui_info->field_info->p_id;
|
|
proto_tree_add_uint(snap_tree, hf, tvb, offset+3, 2, etype);
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
|
|
if(!dissector_try_uint(hpteam_subdissector_table,etype, next_tvb, pinfo, tree))
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case OUI_ENCAP_ETHER:
|
|
case OUI_CISCO_90:
|
|
case OUI_APPLE_ATALK:
|
|
/* No, I have no idea why Apple used
|
|
one of their own OUIs, rather than
|
|
OUI_ENCAP_ETHER, and an Ethernet
|
|
packet type as protocol ID, for
|
|
AppleTalk data packets - but used
|
|
OUI_ENCAP_ETHER and an Ethernet
|
|
packet type for AARP packets. */
|
|
if (XDLC_IS_INFORMATION(control)) {
|
|
if (tree) {
|
|
proto_tree_add_uint(snap_tree, hf_type,
|
|
tvb, offset+3, 2, etype);
|
|
}
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
if (!dissector_try_uint(ethertype_subdissector_table,
|
|
etype, next_tvb, pinfo, tree))
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
} else {
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
}
|
|
break;
|
|
|
|
case OUI_IEEE_802_1:
|
|
/*
|
|
* MAC frames bridged over ATM (RFC 2684) or Frame Relay
|
|
* (RFC 2427).
|
|
*
|
|
* We have to figure out how much padding to put
|
|
* into the frame. We were handed a "bridge_pad"
|
|
* argument which should be 0 for Frame Relay and
|
|
* 2 for ATM; we add to that the amount of padding
|
|
* common to both bridging types.
|
|
*/
|
|
if (tree) {
|
|
proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2,
|
|
etype);
|
|
}
|
|
|
|
switch (etype) {
|
|
|
|
case BPID_ETH_WITH_FCS:
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad);
|
|
call_dissector(eth_withfcs_handle, next_tvb, pinfo,
|
|
tree);
|
|
break;
|
|
|
|
case BPID_ETH_WITHOUT_FCS:
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad);
|
|
call_dissector(eth_withoutfcs_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case BPID_802_5_WITH_FCS:
|
|
case BPID_802_5_WITHOUT_FCS:
|
|
/*
|
|
* We treat the last padding byte as the Access
|
|
* Control byte, as that's what the Token
|
|
* Ring dissector expects the first byte to
|
|
* be.
|
|
*/
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5+bridge_pad);
|
|
call_dissector(tr_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case BPID_FDDI_WITH_FCS:
|
|
case BPID_FDDI_WITHOUT_FCS:
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5+1+bridge_pad);
|
|
call_dissector(fddi_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case BPID_BPDU:
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
call_dissector(bpdu_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
default:
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case OUI_CABLE_BPDU: /* DOCSIS cable modem spanning tree BPDU */
|
|
if (tree) {
|
|
proto_tree_add_uint(snap_tree, hf_pid, tvb, offset+3, 2,
|
|
etype);
|
|
}
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
call_dissector(bpdu_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case OUI_TURBOCELL:
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+3);
|
|
call_dissector(turbo_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case OUI_MARVELL:
|
|
/*
|
|
* OLPC packet. The PID is an Ethertype, but
|
|
* there's a mesh header between the PID and
|
|
* the payload.
|
|
*/
|
|
if (XDLC_IS_INFORMATION(control)) {
|
|
if (tree) {
|
|
proto_tree_add_uint(snap_tree, hf_type,
|
|
tvb, offset+3, 2, etype);
|
|
}
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
mesh_header_len = call_dissector(mesh_handle,
|
|
next_tvb, pinfo, tree);
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5+mesh_header_len);
|
|
if (!dissector_try_uint(ethertype_subdissector_table,
|
|
etype, next_tvb, pinfo, tree))
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
} else {
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/*
|
|
* Do we have information for this OUI?
|
|
*/
|
|
oui_info = get_snap_oui_info(oui);
|
|
if (oui_info != NULL) {
|
|
/*
|
|
* Yes - use it.
|
|
*/
|
|
hf = *oui_info->field_info->p_id;
|
|
subdissector_table = oui_info->table;
|
|
} else {
|
|
/*
|
|
* No, use hf_pid for the PID and just dissect
|
|
* the payload as data.
|
|
*/
|
|
hf = hf_pid;
|
|
subdissector_table = NULL;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_uint(snap_tree, hf, tvb, offset+3, 2,
|
|
etype);
|
|
}
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset+5);
|
|
if (XDLC_IS_INFORMATION(control)) {
|
|
if (subdissector_table != NULL) {
|
|
/* do lookup with the subdissector table */
|
|
if (dissector_try_uint(subdissector_table,
|
|
etype, next_tvb, pinfo, tree))
|
|
break;
|
|
}
|
|
}
|
|
call_data_dissector(next_tvb, pinfo, tree);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return the oui_info_t for the PID for a particular OUI value, or NULL
|
|
* if there isn't one.
|
|
*/
|
|
oui_info_t *
|
|
get_snap_oui_info(guint32 oui)
|
|
{
|
|
if (oui_info_table != NULL) {
|
|
return (oui_info_t *)g_hash_table_lookup(oui_info_table,
|
|
GUINT_TO_POINTER(oui));
|
|
} else
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
proto_register_llc(void)
|
|
{
|
|
static struct true_false_string ig_bit = { "Group", "Individual" };
|
|
static struct true_false_string cr_bit = { "Response", "Command" };
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_llc_dsap,
|
|
{ "DSAP", "llc.dsap", FT_UINT8, BASE_HEX,
|
|
VALS(sap_vals), 0x0, "Destination Service Access Point", HFILL }},
|
|
|
|
{ &hf_llc_dsap_sap,
|
|
{ "SAP", "llc.dsap.sap", FT_UINT8, BASE_CUSTOM,
|
|
CF_FUNC(llc_sap_value), 0xFE, "Service Access Point", HFILL }},
|
|
|
|
{ &hf_llc_dsap_ig,
|
|
{ "IG Bit", "llc.dsap.ig", FT_BOOLEAN, 8,
|
|
TFS(&ig_bit), DSAP_GI_BIT, "Individual/Group", HFILL }},
|
|
|
|
{ &hf_llc_ssap,
|
|
{ "SSAP", "llc.ssap", FT_UINT8, BASE_HEX,
|
|
VALS(sap_vals), 0x0, "Source Service Access Point", HFILL }},
|
|
|
|
{ &hf_llc_ssap_sap,
|
|
{ "SAP", "llc.ssap.sap", FT_UINT8, BASE_CUSTOM,
|
|
CF_FUNC(llc_sap_value), 0xFE, "Service Access Point", HFILL }},
|
|
|
|
{ &hf_llc_ssap_cr,
|
|
{ "CR Bit", "llc.ssap.cr", FT_BOOLEAN, 8,
|
|
TFS(&cr_bit), SSAP_CR_BIT, "Command/Response", HFILL }},
|
|
|
|
{ &hf_llc_ctrl,
|
|
{ "Control", "llc.control", FT_UINT16, BASE_HEX,
|
|
NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_llc_n_r,
|
|
{ "N(R)", "llc.control.n_r", FT_UINT16, BASE_DEC,
|
|
NULL, XDLC_N_R_EXT_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_llc_n_s,
|
|
{ "N(S)", "llc.control.n_s", FT_UINT16, BASE_DEC,
|
|
NULL, XDLC_N_S_EXT_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_llc_p,
|
|
{ "Poll", "llc.control.p", FT_BOOLEAN, 8,
|
|
TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }},
|
|
|
|
{ &hf_llc_p_ext,
|
|
{ "Poll", "llc.control.p", FT_BOOLEAN, 16,
|
|
TFS(&tfs_set_notset), XDLC_P_F_EXT, NULL, HFILL }},
|
|
|
|
{ &hf_llc_f,
|
|
{ "Final", "llc.control.f", FT_BOOLEAN, 8,
|
|
TFS(&tfs_set_notset), XDLC_P_F, NULL, HFILL }},
|
|
|
|
{ &hf_llc_f_ext,
|
|
{ "Final", "llc.control.f", FT_BOOLEAN, 16,
|
|
TFS(&tfs_set_notset), XDLC_P_F_EXT, NULL, HFILL }},
|
|
|
|
{ &hf_llc_s_ftype,
|
|
{ "Supervisory frame type", "llc.control.s_ftype", FT_UINT16, BASE_HEX,
|
|
VALS(stype_vals), XDLC_S_FTYPE_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_llc_u_modifier_cmd,
|
|
{ "Command", "llc.control.u_modifier_cmd", FT_UINT8, BASE_HEX,
|
|
VALS(modifier_vals_cmd), XDLC_U_MODIFIER_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_llc_u_modifier_resp,
|
|
{ "Response", "llc.control.u_modifier_resp", FT_UINT8, BASE_HEX,
|
|
VALS(modifier_vals_resp), XDLC_U_MODIFIER_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_llc_ftype_i,
|
|
{ "Frame type", "llc.control.ftype", FT_UINT16, BASE_HEX,
|
|
VALS(ftype_vals), XDLC_I_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_llc_ftype_s_u,
|
|
{ "Frame type", "llc.control.ftype", FT_UINT8, BASE_HEX,
|
|
VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_llc_ftype_s_u_ext,
|
|
{ "Frame type", "llc.control.ftype", FT_UINT16, BASE_HEX,
|
|
VALS(ftype_vals), XDLC_S_U_MASK, NULL, HFILL }},
|
|
|
|
/* registered here but handled in ethertype.c */
|
|
{ &hf_llc_type,
|
|
{ "Type", "llc.type", FT_UINT16, BASE_HEX,
|
|
VALS(etype_vals), 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_llc_oui,
|
|
{ "Organization Code", "llc.oui", FT_UINT24, BASE_HEX,
|
|
VALS(oui_vals), 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_llc_pid,
|
|
{ "Protocol ID", "llc.pid", FT_UINT16, BASE_HEX,
|
|
NULL, 0x0, NULL, HFILL }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_llc,
|
|
&ett_llc_dsap,
|
|
&ett_llc_ssap,
|
|
&ett_llc_ctrl,
|
|
};
|
|
|
|
proto_llc = proto_register_protocol("Logical-Link Control", "LLC", "llc");
|
|
proto_register_field_array(proto_llc, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
/* subdissector code */
|
|
dsap_subdissector_table = register_dissector_table("llc.dsap",
|
|
"LLC SAP", proto_llc, FT_UINT8, BASE_HEX, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
|
|
xid_subdissector_table = register_dissector_table("llc.xid_dsap",
|
|
"LLC XID SAP", proto_llc, FT_UINT8, BASE_HEX, DISSECTOR_TABLE_NOT_ALLOW_DUPLICATE);
|
|
register_capture_dissector_table("llc.dsap", "LLC");
|
|
|
|
register_dissector("llc", dissect_llc, proto_llc);
|
|
}
|
|
|
|
void
|
|
proto_register_basicxid(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_llc_xid_format,
|
|
{ "XID Format", "basicxid.llc.xid.format", FT_UINT8, BASE_HEX,
|
|
VALS(format_vals), 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_llc_xid_types,
|
|
{ "LLC Types/Classes", "basicxid.llc.xid.types", FT_UINT8, BASE_HEX,
|
|
VALS(type_vals), 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_llc_xid_wsize,
|
|
{ "Receive Window Size", "basicxid.llc.xid.wsize", FT_UINT8, BASE_DEC,
|
|
NULL, 0x0, NULL, HFILL }}
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_llc_basicxid
|
|
};
|
|
|
|
proto_basicxid = proto_register_protocol("Logical-Link Control Basic Format XID", "Basic Format XID", "basicxid");
|
|
proto_register_field_array(proto_basicxid, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
register_dissector("basicxid", dissect_basicxid, proto_basicxid);
|
|
}
|
|
|
|
static void
|
|
register_hf(gpointer key _U_, gpointer value, gpointer user_data _U_)
|
|
{
|
|
oui_info_t *info = (oui_info_t *)value;
|
|
|
|
proto_register_field_array(proto_llc, info->field_info, 1);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_llc(void)
|
|
{
|
|
dissector_handle_t llc_handle;
|
|
|
|
/*
|
|
* Get handles for the BPDU, Ethernet, FDDI, Token Ring and
|
|
* Turbocell dissectors.
|
|
*/
|
|
bpdu_handle = find_dissector_add_dependency("bpdu", proto_llc);
|
|
eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_llc);
|
|
eth_withfcs_handle = find_dissector_add_dependency("eth_withfcs", proto_llc);
|
|
fddi_handle = find_dissector_add_dependency("fddi", proto_llc);
|
|
tr_handle = find_dissector_add_dependency("tr", proto_llc);
|
|
turbo_handle = find_dissector_add_dependency("turbocell", proto_llc);
|
|
mesh_handle = find_dissector_add_dependency("mesh", proto_llc);
|
|
|
|
/*
|
|
* Get the Ethertype dissector table.
|
|
*/
|
|
ethertype_subdissector_table = find_dissector_table("ethertype");
|
|
hpteam_subdissector_table = find_dissector_table("llc.hpteam_pid");
|
|
|
|
llc_handle = find_dissector("llc");
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_ATM_RFC1483, llc_handle);
|
|
dissector_add_uint("sll.ltype", LINUX_SLL_P_802_2, llc_handle);
|
|
/* RFC 2043 */
|
|
dissector_add_uint("ppp.protocol", PPP_LLC, llc_handle);
|
|
/* RFC 2353 */
|
|
dissector_add_uint("udp.port", UDP_PORT_LLC1, llc_handle);
|
|
dissector_add_uint("udp.port", UDP_PORT_LLC2, llc_handle);
|
|
dissector_add_uint("udp.port", UDP_PORT_LLC3, llc_handle);
|
|
dissector_add_uint("udp.port", UDP_PORT_LLC4, llc_handle);
|
|
dissector_add_uint("udp.port", UDP_PORT_LLC5, llc_handle);
|
|
/* IP-over-FC when we have the full FC frame */
|
|
dissector_add_uint("fc.ftype", FC_FTYPE_IP, llc_handle);
|
|
|
|
dissector_add_uint("atm.aal5.type", TRAF_LLCMX, llc_handle);
|
|
|
|
/*
|
|
* BACNET-over-ARCNET is really BACNET-over-802.2 LLC-over-ARCNET,
|
|
* apparently.
|
|
*/
|
|
dissector_add_uint("arcnet.protocol_id", ARCNET_PROTO_BACNET, llc_handle);
|
|
dissector_add_uint("ethertype", ETHERTYPE_JUMBO_LLC, llc_handle);
|
|
|
|
dissector_add_uint("juniper.proto", JUNIPER_PROTO_LLC, llc_handle);
|
|
dissector_add_uint("juniper.proto", JUNIPER_PROTO_LLC_SNAP, llc_handle);
|
|
|
|
register_capture_dissector("ethertype", ETHERTYPE_JUMBO_LLC, capture_llc, proto_llc);
|
|
register_capture_dissector("atm.aal5.type", TRAF_LLCMX, capture_llc, proto_llc);
|
|
register_capture_dissector("sll.ltype", LINUX_SLL_P_802_2, capture_llc, proto_llc);
|
|
|
|
/*
|
|
* Register all the fields for PIDs for various OUIs.
|
|
*/
|
|
if (oui_info_table != NULL)
|
|
g_hash_table_foreach(oui_info_table, register_hf, NULL);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|