forked from osmocom/wireshark
0b1fd7e8fb
Bug: 12939 Change-Id: Ib4e8adbff3e335e602da5e6857bfc801601fd25e Reviewed-on: https://code.wireshark.org/review/17871 Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com> Petri-Dish: Pascal Quantin <pascal.quantin@gmail.com> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net>
3004 lines
124 KiB
C
3004 lines
124 KiB
C
/* packet-6lowpan.c
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* Routines for 6LoWPAN packet disassembly
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* By Owen Kirby <osk@exegin.com>
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* Copyright 2009 Owen Kirby
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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 <stdio.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/reassemble.h>
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#include <epan/ipproto.h>
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#include <epan/addr_resolv.h>
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#include <epan/proto_data.h>
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#include "packet-ipv6.h"
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#include "packet-6lowpan.h"
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#include "packet-btl2cap.h"
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#include "packet-zbee.h"
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void proto_register_6lowpan(void);
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void proto_reg_handoff_6lowpan(void);
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/* Definitions for 6lowpan packet disassembly structures and routines */
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/* 6LoWPAN Patterns */
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#define LOWPAN_PATTERN_NALP 0x00
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#define LOWPAN_PATTERN_NALP_BITS 2
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#define LOWPAN_PATTERN_IPV6 0x41
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#define LOWPAN_PATTERN_IPV6_BITS 8
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#define LOWPAN_PATTERN_HC1 0x42 /* Deprecated - replaced with IPHC. */
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#define LOWPAN_PATTERN_HC1_BITS 8
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#define LOWPAN_PATTERN_BC0 0x50
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#define LOWPAN_PATTERN_BC0_BITS 8
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#define LOWPAN_PATTERN_IPHC 0x03 /* See draft-ietf-6lowpan-hc-15.txt */
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#define LOWPAN_PATTERN_IPHC_BITS 3
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#define LOWPAN_PATTERN_ESC 0x7f
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#define LOWPAN_PATTERN_ESC_BITS 8
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#define LOWPAN_PATTERN_MESH 0x02
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#define LOWPAN_PATTERN_MESH_BITS 2
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#define LOWPAN_PATTERN_FRAG1 0x18
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#define LOWPAN_PATTERN_FRAGN 0x1c
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#define LOWPAN_PATTERN_FRAG_BITS 5
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/* 6LoWPAN HC1 Header */
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#define LOWPAN_HC1_SOURCE_PREFIX 0x80
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#define LOWPAN_HC1_SOURCE_IFC 0x40
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#define LOWPAN_HC1_DEST_PREFIX 0x20
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#define LOWPAN_HC1_DEST_IFC 0x10
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#define LOWPAN_HC1_TRAFFIC_CLASS 0x08
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#define LOWPAN_HC1_NEXT 0x06
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#define LOWPAN_HC1_MORE 0x01
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/* IPv6 header field lengths (in bits) */
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#define LOWPAN_IPV6_TRAFFIC_CLASS_BITS 8
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#define LOWPAN_IPV6_FLOW_LABEL_BITS 20
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#define LOWPAN_IPV6_NEXT_HEADER_BITS 8
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#define LOWPAN_IPV6_HOP_LIMIT_BITS 8
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#define LOWPAN_IPV6_PREFIX_BITS 64
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#define LOWPAN_IPV6_INTERFACE_BITS 64
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/* HC_UDP header field lengths (in bits). */
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#define LOWPAN_UDP_PORT_BITS 16
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#define LOWPAN_UDP_PORT_COMPRESSED_BITS 4
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#define LOWPAN_UDP_LENGTH_BITS 16
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#define LOWPAN_UDP_CHECKSUM_BITS 16
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/* HC1 Next Header compression modes. */
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#define LOWPAN_HC1_NEXT_NONE 0x00
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#define LOWPAN_HC1_NEXT_UDP 0x01
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#define LOWPAN_HC1_NEXT_ICMP 0x02
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#define LOWPAN_HC1_NEXT_TCP 0x03
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/* HC_UDP Header */
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#define LOWPAN_HC2_UDP_SRCPORT 0x80
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#define LOWPAN_HC2_UDP_DSTPORT 0x40
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#define LOWPAN_HC2_UDP_LENGTH 0x20
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#define LOWPAN_HC2_UDP_RESERVED 0x1f
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/* IPHC Base flags */
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#define LOWPAN_IPHC_FLAG_FLOW 0x1800
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#define LOWPAN_IPHC_FLAG_NHDR 0x0400
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#define LOWPAN_IPHC_FLAG_HLIM 0x0300
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#define LOWPAN_IPHC_FLAG_CONTEXT_ID 0x0080
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#define LOWPAN_IPHC_FLAG_SRC_COMP 0x0040
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#define LOWPAN_IPHC_FLAG_SRC_MODE 0x0030
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#define LOWPAN_IPHC_FLAG_MCAST_COMP 0x0008
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#define LOWPAN_IPHC_FLAG_DST_COMP 0x0004
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#define LOWPAN_IPHC_FLAG_DST_MODE 0x0003
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#define LOWPAN_IPHC_FLAG_SCI 0xf0
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#define LOWPAN_IPHC_FLAG_DCI 0x0f
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/* Offsets for extracting integer fields. */
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#define LOWPAN_IPHC_FLAG_OFFSET_FLOW 11
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#define LOWPAN_IPHC_FLAG_OFFSET_HLIM 8
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#define LOWPAN_IPHC_FLAG_OFFSET_SRC_MODE 4
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#define LOWPAN_IPHC_FLAG_OFFSET_DST_MODE 0
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#define LOWPAN_IPHC_FLAG_OFFSET_SCI 4
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#define LOWPAN_IPHC_FLAG_OFFSET_DCI 0
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/* IPHC Flow encoding values. */
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#define LOWPAN_IPHC_FLOW_CLASS_LABEL 0x0
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#define LOWPAN_IPHC_FLOW_ECN_LABEL 0x1
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#define LOWPAN_IPHC_FLOW_CLASS 0x2
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#define LOWPAN_IPHC_FLOW_COMPRESSED 0x3
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/* IPHC Hop limit encoding. */
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#define LOWPAN_IPHC_HLIM_INLINE 0x0
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#define LOWPAN_IPHC_HLIM_1 0x1
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#define LOWPAN_IPHC_HLIM_64 0x2
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#define LOWPAN_IPHC_HLIM_255 0x3
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/* IPHC address modes. */
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#define LOWPAN_IPHC_ADDR_SRC_UNSPEC 0x0
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#define LOWPAN_IPHC_ADDR_FULL_INLINE 0x0
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#define LOWPAN_IPHC_ADDR_64BIT_INLINE 0x1
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#define LOWPAN_IPHC_ADDR_16BIT_INLINE 0x2
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#define LOWPAN_IPHC_ADDR_COMPRESSED 0x3
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/* IPHC multicast address modes. */
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#define LOWPAN_IPHC_MCAST_FULL 0x0
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#define LOWPAN_IPHC_MCAST_48BIT 0x1
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#define LOWPAN_IPHC_MCAST_32BIT 0x2
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#define LOWPAN_IPHC_MCAST_8BIT 0x3
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#define LOWPAN_IPHC_MCAST_STATEFUL_48BIT 0x0
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/* IPHC Traffic class and flow label field sizes (in bits) */
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#define LOWPAN_IPHC_ECN_BITS 2
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#define LOWPAN_IPHC_DSCP_BITS 6
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#define LOWPAN_IPHC_LABEL_BITS 20
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/* NHC Patterns. */
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#define LOWPAN_NHC_PATTERN_EXT 0x0e
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#define LOWPAN_NHC_PATTERN_EXT_BITS 4
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#define LOWPAN_NHC_PATTERN_UDP 0x1e
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#define LOWPAN_NHC_PATTERN_UDP_BITS 5
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/* IP-in-IP tunneling is handled as a separate NHC pattern. */
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#define LOWPAN_NHC_PATTERN_EXT_IPV6 ((LOWPAN_NHC_PATTERN_EXT << LOWPAN_NHC_EXT_EID_BITS) | LOWPAN_NHC_EID_IPV6)
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#define LOWPAN_NHC_PATTERN_EXT_IPV6_BITS (LOWPAN_NHC_PATTERN_EXT_BITS + LOWPAN_NHC_EXT_EID_BITS)
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/* NHC Extension header fields. */
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#define LOWPAN_NHC_EXT_EID 0x0e
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#define LOWPAN_NHC_EXT_EID_OFFSET 1
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#define LOWPAN_NHC_EXT_EID_BITS 3
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#define LOWPAN_NHC_EXT_NHDR 0x01
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/* Extension header ID codes. */
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#define LOWPAN_NHC_EID_HOP_BY_HOP 0x00
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#define LOWPAN_NHC_EID_ROUTING 0x01
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#define LOWPAN_NHC_EID_FRAGMENT 0x02
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#define LOWPAN_NHC_EID_DEST_OPTIONS 0x03
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#define LOWPAN_NHC_EID_MOBILITY 0x04
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#define LOWPAN_NHC_EID_IPV6 0x07
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/* NHC UDP fields. */
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#define LOWPAN_NHC_UDP_CHECKSUM 0x04
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#define LOWPAN_NHC_UDP_SRCPORT 0x02
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#define LOWPAN_NHC_UDP_DSTPORT 0x01
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/* 6LoWPAN Mesh Header */
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#define LOWPAN_MESH_HEADER_V 0x20
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#define LOWPAN_MESH_HEADER_F 0x10
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#define LOWPAN_MESH_HEADER_HOPS 0x0f
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/* 6LoWPAN First Fragment Header */
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#define LOWPAN_FRAG_DGRAM_SIZE_BITS 11
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/* Uncompressed IPv6 Option types */
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#define IP6OPT_PAD1 0x00
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#define IP6OPT_PADN 0x01
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/* Compressed port number offset. */
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#define LOWPAN_PORT_8BIT_OFFSET 0xf000
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#define LOWPAN_PORT_12BIT_OFFSET (LOWPAN_PORT_8BIT_OFFSET | 0xb0)
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/* 6LoWPAN interface identifier length. */
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#define LOWPAN_IFC_ID_LEN 8
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/* Protocol fields handles. */
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static int proto_6lowpan = -1;
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static int hf_6lowpan_pattern = -1;
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static int hf_6lowpan_nhc_pattern = -1;
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static int hf_6lowpan_padding = -1;
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/* Header compression fields. */
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static int hf_6lowpan_hc1_encoding = -1;
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static int hf_6lowpan_hc1_source_prefix = -1;
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static int hf_6lowpan_hc1_source_ifc = -1;
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static int hf_6lowpan_hc1_dest_prefix = -1;
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static int hf_6lowpan_hc1_dest_ifc = -1;
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static int hf_6lowpan_hc1_class = -1;
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static int hf_6lowpan_hc1_next = -1;
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static int hf_6lowpan_hc1_more = -1;
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static int hf_6lowpan_hc2_udp_encoding = -1;
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static int hf_6lowpan_hc2_udp_src = -1;
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static int hf_6lowpan_hc2_udp_dst = -1;
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static int hf_6lowpan_hc2_udp_len = -1;
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/* IPHC header field. */
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static int hf_6lowpan_iphc_flag_tf = -1;
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static int hf_6lowpan_iphc_flag_nhdr = -1;
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static int hf_6lowpan_iphc_flag_hlim = -1;
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static int hf_6lowpan_iphc_flag_cid = -1;
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static int hf_6lowpan_iphc_flag_sac = -1;
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static int hf_6lowpan_iphc_flag_sam = -1;
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static int hf_6lowpan_iphc_flag_mcast = -1;
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static int hf_6lowpan_iphc_flag_dac = -1;
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static int hf_6lowpan_iphc_flag_dam = -1;
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static int hf_6lowpan_iphc_sci = -1;
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static int hf_6lowpan_iphc_dci = -1;
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static int hf_6lowpan_iphc_sctx_prefix = -1;
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static int hf_6lowpan_iphc_sctx_origin = -1;
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static int hf_6lowpan_iphc_dctx_prefix = -1;
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static int hf_6lowpan_iphc_dctx_origin = -1;
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/* NHC IPv6 extension header fields. */
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static int hf_6lowpan_nhc_ext_eid = -1;
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static int hf_6lowpan_nhc_ext_nh = -1;
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static int hf_6lowpan_nhc_ext_next = -1;
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static int hf_6lowpan_nhc_ext_length = -1;
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static int hf_6lowpan_nhc_ext_reserved = -1;
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/* NHC UDP compression header fields. */
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static int hf_6lowpan_nhc_udp_checksum = -1;
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static int hf_6lowpan_nhc_udp_src = -1;
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static int hf_6lowpan_nhc_udp_dst = -1;
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/* Inline IPv6 header fields. */
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static int hf_6lowpan_traffic_class = -1;
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static int hf_6lowpan_flow_label = -1;
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static int hf_6lowpan_ecn = -1;
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static int hf_6lowpan_dscp = -1;
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static int hf_6lowpan_next_header = -1;
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static int hf_6lowpan_hop_limit = -1;
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static int hf_6lowpan_source = -1;
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static int hf_6lowpan_dest = -1;
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/* Inline UDP header fields. */
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static int hf_6lowpan_udp_src = -1;
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static int hf_6lowpan_udp_dst = -1;
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static int hf_6lowpan_udp_len = -1;
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static int hf_6lowpan_udp_checksum = -1;
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/* Broadcast header fields. */
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static int hf_6lowpan_bcast_seqnum = -1;
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/* Mesh header fields. */
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static int hf_6lowpan_mesh_v = -1;
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static int hf_6lowpan_mesh_f = -1;
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static int hf_6lowpan_mesh_hops = -1;
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static int hf_6lowpan_mesh_hops8 = -1;
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static int hf_6lowpan_mesh_orig16 = -1;
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static int hf_6lowpan_mesh_orig64 = -1;
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static int hf_6lowpan_mesh_dest16 = -1;
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static int hf_6lowpan_mesh_dest64 = -1;
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/* Fragmentation header fields. */
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static int hf_6lowpan_frag_dgram_size = -1;
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static int hf_6lowpan_frag_dgram_tag = -1;
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static int hf_6lowpan_frag_dgram_offset = -1;
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/* Protocol tree handles. */
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static gint ett_6lowpan = -1;
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static gint ett_6lowpan_hc1 = -1;
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static gint ett_6lowpan_hc1_encoding = -1;
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static gint ett_6lowpan_hc2_udp = -1;
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static gint ett_6lowpan_iphc = -1;
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static gint ett_6lowpan_nhc_ext = -1;
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static gint ett_6lowpan_nhc_udp = -1;
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static gint ett_6lowpan_bcast = -1;
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static gint ett_6lowpan_mesh = -1;
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static gint ett_6lowpan_mesh_flags = -1;
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static gint ett_6lowpan_frag = -1;
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static expert_field ei_6lowpan_hc1_more_bits = EI_INIT;
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static expert_field ei_6lowpan_illegal_dest_addr_mode = EI_INIT;
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static expert_field ei_6lowpan_bad_ipv6_header_length = EI_INIT;
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static expert_field ei_6lowpan_bad_ext_header_length = EI_INIT;
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/* Subdissector handles. */
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static dissector_handle_t handle_6lowpan;
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static dissector_handle_t ipv6_handle;
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/* Value Strings */
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static const value_string lowpan_patterns [] = {
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{ LOWPAN_PATTERN_NALP, "Not a LoWPAN frame" },
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{ LOWPAN_PATTERN_IPV6, "Uncompressed IPv6" },
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{ LOWPAN_PATTERN_HC1, "Header compression" },
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{ LOWPAN_PATTERN_BC0, "Broadcast" },
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{ LOWPAN_PATTERN_IPHC, "IP header compression" },
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{ LOWPAN_PATTERN_ESC, "Escape" },
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{ LOWPAN_PATTERN_MESH, "Mesh" },
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{ LOWPAN_PATTERN_FRAG1, "First fragment" },
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{ LOWPAN_PATTERN_FRAGN, "Fragment" },
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{ 0, NULL }
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};
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static const true_false_string lowpan_compression = {
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"Compressed",
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"Inline"
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};
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static const value_string lowpan_hc1_next [] = {
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{ LOWPAN_HC1_NEXT_NONE, "Inline" },
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{ LOWPAN_HC1_NEXT_UDP, "UDP" },
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{ LOWPAN_HC1_NEXT_ICMP, "ICMP" },
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{ LOWPAN_HC1_NEXT_TCP, "TCP" },
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{ 0, NULL }
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};
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static const value_string lowpan_iphc_traffic [] = {
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{ LOWPAN_IPHC_FLOW_CLASS_LABEL, "Traffic class and flow label inline" },
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{ LOWPAN_IPHC_FLOW_ECN_LABEL, "ECN and flow label inline" },
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{ LOWPAN_IPHC_FLOW_CLASS, "Traffic class inline" },
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{ LOWPAN_IPHC_FLOW_COMPRESSED, "Version, traffic class, and flow label compressed" },
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{ 0, NULL }
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};
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static const value_string lowpan_iphc_hop_limit [] = {
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{ LOWPAN_IPHC_HLIM_INLINE, "Inline" },
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{ LOWPAN_IPHC_HLIM_1, "1" },
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{ LOWPAN_IPHC_HLIM_64, "64" },
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{ LOWPAN_IPHC_HLIM_255, "255" },
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{ 0, NULL }
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};
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static const true_false_string lowpan_iphc_addr_compression = {
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"Stateful",
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"Stateless"
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};
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static const value_string lowpan_iphc_addr_modes [] = {
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{ LOWPAN_IPHC_ADDR_FULL_INLINE, "Inline" },
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{ LOWPAN_IPHC_ADDR_64BIT_INLINE,"64-bits inline" },
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{ LOWPAN_IPHC_ADDR_16BIT_INLINE,"16-bits inline" },
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{ LOWPAN_IPHC_ADDR_COMPRESSED, "Compressed" },
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{ 0, NULL }
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};
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static const value_string lowpan_iphc_saddr_stateful_modes [] = {
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{ LOWPAN_IPHC_ADDR_FULL_INLINE, "Unspecified address (::)" },
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{ LOWPAN_IPHC_ADDR_64BIT_INLINE,"64-bits inline" },
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{ LOWPAN_IPHC_ADDR_16BIT_INLINE,"16-bits inline" },
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{ LOWPAN_IPHC_ADDR_COMPRESSED, "Compressed" },
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{ 0, NULL }
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};
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static const value_string lowpan_iphc_daddr_stateful_modes [] = {
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{ LOWPAN_IPHC_ADDR_64BIT_INLINE,"64-bits inline" },
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{ LOWPAN_IPHC_ADDR_16BIT_INLINE,"16-bits inline" },
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{ LOWPAN_IPHC_ADDR_COMPRESSED, "Compressed" },
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{ 0, NULL }
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};
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static const value_string lowpan_iphc_mcast_modes [] = {
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{ LOWPAN_IPHC_MCAST_FULL, "Inline" },
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{ LOWPAN_IPHC_MCAST_48BIT, "48-bits inline" },
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{ LOWPAN_IPHC_MCAST_32BIT, "32-bits inline" },
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{ LOWPAN_IPHC_MCAST_8BIT, "8-bits inline" },
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{ 0, NULL }
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};
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static const value_string lowpan_iphc_mcast_stateful_modes [] = {
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{ LOWPAN_IPHC_MCAST_STATEFUL_48BIT, "48-bits inline" },
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|
{ 0, NULL }
|
|
};
|
|
static const value_string lowpan_nhc_patterns [] = {
|
|
{ LOWPAN_NHC_PATTERN_EXT, "IPv6 extension header" },
|
|
{ LOWPAN_NHC_PATTERN_UDP, "UDP compression header" },
|
|
{ 0, NULL }
|
|
};
|
|
static const value_string lowpan_nhc_eid [] = {
|
|
{ LOWPAN_NHC_EID_HOP_BY_HOP, "IPv6 hop-by-hop options" },
|
|
{ LOWPAN_NHC_EID_ROUTING, "IPv6 routing" },
|
|
{ LOWPAN_NHC_EID_FRAGMENT, "IPv6 fragment" },
|
|
{ LOWPAN_NHC_EID_DEST_OPTIONS, "IPv6 destination options" },
|
|
{ LOWPAN_NHC_EID_MOBILITY, "IPv6 mobility header" },
|
|
{ LOWPAN_NHC_EID_IPV6, "IPv6 header" },
|
|
{ 0, NULL }
|
|
};
|
|
/* Reassembly Data */
|
|
static int hf_6lowpan_fragments = -1;
|
|
static int hf_6lowpan_fragment = -1;
|
|
static int hf_6lowpan_fragment_overlap = -1;
|
|
static int hf_6lowpan_fragment_overlap_conflicts = -1;
|
|
static int hf_6lowpan_fragment_multiple_tails = -1;
|
|
static int hf_6lowpan_fragment_too_long_fragment = -1;
|
|
static int hf_6lowpan_fragment_error = -1;
|
|
static int hf_6lowpan_fragment_count = -1;
|
|
static int hf_6lowpan_reassembled_in = -1;
|
|
static int hf_6lowpan_reassembled_length = -1;
|
|
static gint ett_6lowpan_fragment = -1;
|
|
static gint ett_6lowpan_fragments = -1;
|
|
|
|
static const fragment_items lowpan_frag_items = {
|
|
/* Fragment subtrees */
|
|
&ett_6lowpan_fragment,
|
|
&ett_6lowpan_fragments,
|
|
/* Fragment fields */
|
|
&hf_6lowpan_fragments,
|
|
&hf_6lowpan_fragment,
|
|
&hf_6lowpan_fragment_overlap,
|
|
&hf_6lowpan_fragment_overlap_conflicts,
|
|
&hf_6lowpan_fragment_multiple_tails,
|
|
&hf_6lowpan_fragment_too_long_fragment,
|
|
&hf_6lowpan_fragment_error,
|
|
&hf_6lowpan_fragment_count,
|
|
/* Reassembled in field */
|
|
&hf_6lowpan_reassembled_in,
|
|
/* Reassembled length field */
|
|
&hf_6lowpan_reassembled_length,
|
|
/* Reassembled data field */
|
|
NULL,
|
|
/* Tag */
|
|
"6LoWPAN fragments"
|
|
};
|
|
|
|
static reassembly_table lowpan_reassembly_table;
|
|
static GHashTable *lowpan_context_table = NULL;
|
|
|
|
/* Link-Local prefix used by 6LoWPAN (FF80::/10) */
|
|
static const guint8 lowpan_llprefix[8] = {
|
|
0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
|
|
};
|
|
|
|
/* Context hash table map key. */
|
|
typedef struct {
|
|
guint16 pan; /* PAN Identifier */
|
|
guint8 cid; /* Context Identifier */
|
|
} lowpan_context_key;
|
|
|
|
/* Context hash table map data. */
|
|
typedef struct {
|
|
guint frame; /* Frame where the context was discovered. */
|
|
guint8 plen; /* Prefix length. */
|
|
struct e_in6_addr prefix; /* Compression context. */
|
|
} lowpan_context_data;
|
|
|
|
/* 6LoWPAN contexts. */
|
|
#define LOWPAN_CONTEXT_MAX 16
|
|
#define LOWPAN_CONTEXT_DEFAULT 0
|
|
#define LOWPAN_CONTEXT_LINK_LOCAL LOWPAN_CONTEXT_MAX
|
|
#define LOWPAN_CONTEXT_LINK_LOCAL_BITS 10
|
|
static lowpan_context_data lowpan_context_local;
|
|
static lowpan_context_data lowpan_context_default;
|
|
static const gchar * lowpan_context_prefs[LOWPAN_CONTEXT_MAX];
|
|
|
|
/* Preferences */
|
|
static gboolean rfc4944_short_address_format = FALSE;
|
|
|
|
/* Helper macro to convert a bit offset/length into a byte count. */
|
|
#define BITS_TO_BYTE_LEN(bitoff, bitlen) ((bitlen)?(((bitlen) + ((bitoff)&0x07) + 7) >> 3):(0))
|
|
|
|
/* Structure for rebuilding UDP datagrams. */
|
|
struct udp_hdr {
|
|
guint16 src_port;
|
|
guint16 dst_port;
|
|
guint16 length;
|
|
guint16 checksum;
|
|
};
|
|
|
|
/* Structure used to store decompressed header chains until reassembly. */
|
|
struct lowpan_nhdr {
|
|
/* List Linking */
|
|
struct lowpan_nhdr *next;
|
|
/* Next Header */
|
|
guint8 proto;
|
|
guint length;
|
|
guint reported;
|
|
};
|
|
#define LOWPAN_NHDR_DATA(nhdr) ((guint8 *)(nhdr) + sizeof (struct lowpan_nhdr))
|
|
|
|
/* Dissector prototypes */
|
|
static void proto_init_6lowpan (void);
|
|
static void proto_cleanup_6lowpan(void);
|
|
static void prefs_6lowpan_apply (void);
|
|
static int dissect_6lowpan (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data);
|
|
static tvbuff_t * dissect_6lowpan_ipv6 (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
|
|
static tvbuff_t * dissect_6lowpan_hc1 (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint dgram_size, const guint8 *siid, const guint8 *diid);
|
|
static tvbuff_t * dissect_6lowpan_bc0 (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
|
|
static tvbuff_t * dissect_6lowpan_iphc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint dgram_size, const guint8 *siid, const guint8 *diid);
|
|
static struct lowpan_nhdr *
|
|
dissect_6lowpan_iphc_nhc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset, gint dgram_size, const guint8 *siid, const guint8 *diid);
|
|
static tvbuff_t * dissect_6lowpan_mesh (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint8 *siid, guint8 *diid);
|
|
static tvbuff_t * dissect_6lowpan_frag_first (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, const guint8 *siid, const guint8 *diid);
|
|
static tvbuff_t * dissect_6lowpan_frag_middle (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
|
|
static void dissect_6lowpan_unknown (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
|
|
|
|
/* Helper functions. */
|
|
static gboolean lowpan_dlsrc_to_ifcid (packet_info *pinfo, guint8 *ifcid);
|
|
static gboolean lowpan_dldst_to_ifcid (packet_info *pinfo, guint8 *ifcid);
|
|
static void lowpan_addr16_to_ifcid (guint16 addr, guint8 *ifcid);
|
|
static void lowpan_addr16_with_panid_to_ifcid(guint16 panid, guint16 addr, guint8 *ifcid);
|
|
static tvbuff_t * lowpan_reassemble_ipv6 (tvbuff_t *tvb, packet_info *pinfo, struct ws_ip6_hdr *ipv6, struct lowpan_nhdr *nhdr_list);
|
|
static guint8 lowpan_parse_nhc_proto (tvbuff_t *tvb, gint offset);
|
|
|
|
/* Context table helpers */
|
|
static guint lowpan_context_hash (gconstpointer key);
|
|
static gboolean lowpan_context_equal (gconstpointer a, gconstpointer b);
|
|
static lowpan_context_data *lowpan_context_find(guint8 cid, guint16 pan);
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_pfxcpy
|
|
* DESCRIPTION
|
|
* A version of memcpy that takes a length in bits. If the
|
|
* length is not byte-aligned, the final byte will be
|
|
* manipulated so that only the desired number of bits are
|
|
* copied.
|
|
* PARAMETERS
|
|
* dst ; Destination.
|
|
* src ; Source.
|
|
* bits ; Number of bits to copy.
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static void
|
|
lowpan_pfxcpy(void *dst, const void *src, size_t bits)
|
|
{
|
|
memcpy(dst, src, bits>>3);
|
|
if (bits & 0x7) {
|
|
guint8 mask = ((0xff00) >> (bits & 0x7));
|
|
guint8 last = ((const guint8 *)src)[bits>>3] & mask;
|
|
((guint8 *)dst)[bits>>3] &= ~mask;
|
|
((guint8 *)dst)[bits>>3] |= last;
|
|
}
|
|
} /* lowpan_pfxcpy */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_context_hash
|
|
* DESCRIPTION
|
|
* Context table hash function.
|
|
* PARAMETERS
|
|
* key ; Pointer to a lowpan_context_key type.
|
|
* RETURNS
|
|
* guint ; The hashed key value.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static guint
|
|
lowpan_context_hash(gconstpointer key)
|
|
{
|
|
return (((const lowpan_context_key *)key)->cid) | (((const lowpan_context_key *)key)->pan << 8);
|
|
} /* lowpan_context_hash */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_context_equal
|
|
* DESCRIPTION
|
|
* Context table equals function.
|
|
* PARAMETERS
|
|
* key ; Pointer to a lowpan_context_key type.
|
|
* RETURNS
|
|
* gboolean ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static gboolean
|
|
lowpan_context_equal(gconstpointer a, gconstpointer b)
|
|
{
|
|
return (((const lowpan_context_key *)a)->pan == ((const lowpan_context_key *)b)->pan) &&
|
|
(((const lowpan_context_key *)a)->cid == ((const lowpan_context_key *)b)->cid);
|
|
} /* lowpan_context_equal */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_context_find
|
|
* DESCRIPTION
|
|
* Context table lookup function.
|
|
* PARAMETERS
|
|
* cid ; Context identifier.
|
|
* pan ; PAN identifier.
|
|
* RETURNS
|
|
* lowpan_context_data *;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static lowpan_context_data *
|
|
lowpan_context_find(guint8 cid, guint16 pan)
|
|
{
|
|
lowpan_context_key key;
|
|
lowpan_context_data *data;
|
|
|
|
/* Check for the internal link-local context. */
|
|
if (cid == LOWPAN_CONTEXT_LINK_LOCAL) return &lowpan_context_local;
|
|
|
|
/* Lookup the context from the table. */
|
|
key.pan = pan;
|
|
key.cid = cid;
|
|
data = (lowpan_context_data *)g_hash_table_lookup(lowpan_context_table, &key);
|
|
if (data) return data;
|
|
|
|
/* If we didn't find a match, try again with the broadcast PAN. */
|
|
if (pan != IEEE802154_BCAST_PAN) {
|
|
key.pan = IEEE802154_BCAST_PAN;
|
|
data = (lowpan_context_data *)g_hash_table_lookup(lowpan_context_table, &key);
|
|
if (data) return data;
|
|
}
|
|
|
|
/* If the lookup failed, return the default context (::/0) */
|
|
return &lowpan_context_default;
|
|
} /* lowpan_context_find */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_context_insert
|
|
* DESCRIPTION
|
|
* Context table insert function.
|
|
* PARAMETERS
|
|
* cid ; Context identifier.
|
|
* pan ; PAN identifier.
|
|
* plen ; Prefix length.
|
|
* prefix ; Compression prefix.
|
|
* frame ; Frame number.
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
void
|
|
lowpan_context_insert(guint8 cid, guint16 pan, guint8 plen, struct e_in6_addr *prefix, guint frame)
|
|
{
|
|
lowpan_context_key key;
|
|
lowpan_context_data *data;
|
|
gpointer pkey;
|
|
gpointer pdata;
|
|
|
|
/* Sanity! */
|
|
if (plen > 128) return;
|
|
if (!prefix) return;
|
|
if (!lowpan_context_table) return;
|
|
|
|
/* Search the context table for an existing entry. */
|
|
key.pan = pan;
|
|
key.cid = cid;
|
|
if (g_hash_table_lookup_extended(lowpan_context_table, &key, NULL, &pdata)) {
|
|
/* Context already exists. */
|
|
data = (lowpan_context_data *)pdata;
|
|
if ( (data->plen == plen) && (memcmp(&data->prefix, prefix, (plen+7)/8) == 0) ) {
|
|
/* Context already exists with no change. */
|
|
return;
|
|
}
|
|
}
|
|
pkey = wmem_memdup(NULL, &key, sizeof(key));
|
|
|
|
/* Create a new context */
|
|
data = wmem_new(NULL, lowpan_context_data);
|
|
data->frame = frame;
|
|
data->plen = plen;
|
|
memset(&data->prefix, 0, sizeof(struct e_in6_addr)); /* Ensure zero paddeding */
|
|
lowpan_pfxcpy(&data->prefix, prefix, plen);
|
|
g_hash_table_insert(lowpan_context_table, pkey, data);
|
|
} /* lowpan_context_insert */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_context_free
|
|
* DESCRIPTION
|
|
* Frees the allocated memory for the context hash table
|
|
* PARAMETERS
|
|
* data ; Pointer to key or value
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static void
|
|
lowpan_context_free(gpointer data)
|
|
{
|
|
wmem_free(NULL, data);
|
|
} /* lowpan_context_free */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_addr16_to_ifcid
|
|
* DESCRIPTION
|
|
* Converts a short address to in interface identifier as
|
|
* per rfc 6282 section 3.2.2.
|
|
* PARAMETERS
|
|
* addr ; 16-bit short address.
|
|
* ifcid ; interface identifier (output).
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static void
|
|
lowpan_addr16_to_ifcid(guint16 addr, guint8 *ifcid)
|
|
{
|
|
/* Note: The PANID is no longer used in building the IID. */
|
|
ifcid[0] = 0x00; /* the U/L bit must be cleared. */
|
|
ifcid[1] = 0x00;
|
|
ifcid[2] = 0x00;
|
|
ifcid[3] = 0xff;
|
|
ifcid[4] = 0xfe;
|
|
ifcid[5] = 0x00;
|
|
ifcid[6] = (addr >> 8) & 0xff;
|
|
ifcid[7] = (addr >> 0) & 0xff;
|
|
} /* lowpan_addr16_to_ifcid */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_addr16_with_panid_to_ifcid
|
|
* DESCRIPTION
|
|
* Converts a short address to in interface identifier as
|
|
* per rfc 4944 section 6.
|
|
* PARAMETERS
|
|
* panid ; 16-bit PAN ID.
|
|
* addr ; 16-bit short address.
|
|
* ifcid ; interface identifier (output).
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static void
|
|
lowpan_addr16_with_panid_to_ifcid(guint16 panid, guint16 addr, guint8 *ifcid)
|
|
{
|
|
/* Note: The PANID is used in building the IID following RFC 2464 section 4. */
|
|
ifcid[0] = (panid >> 8) & 0xfd; /* the U/L bit must be cleared. */
|
|
ifcid[1] = (panid >> 0) & 0xff;
|
|
ifcid[2] = 0x00;
|
|
ifcid[3] = 0xff;
|
|
ifcid[4] = 0xfe;
|
|
ifcid[5] = 0x00;
|
|
ifcid[6] = (addr >> 8) & 0xff;
|
|
ifcid[7] = (addr >> 0) & 0xff;
|
|
} /* lowpan_addr16_with_panid_to_ifcid */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_dlsrc_to_ifcid
|
|
* DESCRIPTION
|
|
* Finds an interface identifier from the data-link source
|
|
* addressing.
|
|
* PARAMETERS
|
|
* pinfo ; packet information.
|
|
* ifcid ; interface identifier (output).
|
|
* RETURNS
|
|
* gboolean ; TRUE if an interface identifier could
|
|
* be found.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static gboolean
|
|
lowpan_dlsrc_to_ifcid(packet_info *pinfo, guint8 *ifcid)
|
|
{
|
|
ieee802154_hints_t *hints;
|
|
|
|
/* Check the link-layer address field. */
|
|
if (pinfo->dl_src.type == AT_EUI64) {
|
|
memcpy(ifcid, pinfo->dl_src.data, LOWPAN_IFC_ID_LEN);
|
|
/* RFC2464: Invert the U/L bit when using an EUI64 address. */
|
|
ifcid[0] ^= 0x02;
|
|
return TRUE;
|
|
}
|
|
|
|
/* Lookup the IEEE 802.15.4 addressing hints. */
|
|
hints = (ieee802154_hints_t *)p_get_proto_data(wmem_file_scope(), pinfo,
|
|
proto_get_id_by_filter_name(IEEE802154_PROTOABBREV_WPAN), 0);
|
|
if (hints) {
|
|
|
|
/* Convert the 16-bit short address to an IID using the PAN ID (RFC 4944) or not depending on the preference */
|
|
if (rfc4944_short_address_format) {
|
|
lowpan_addr16_with_panid_to_ifcid(hints->src_pan, hints->src16, ifcid);
|
|
} else {
|
|
lowpan_addr16_to_ifcid(hints->src16, ifcid);
|
|
}
|
|
|
|
return TRUE;
|
|
} else {
|
|
/* Failed to find a link-layer source address. */
|
|
memset(ifcid, 0, LOWPAN_IFC_ID_LEN);
|
|
return FALSE;
|
|
}
|
|
} /* lowpan_dlsrc_to_ifcid */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_dldst_to_ifcid
|
|
* DESCRIPTION
|
|
* Finds an interface identifier from the data-link destination
|
|
* addressing.
|
|
* PARAMETERS
|
|
* pinfo ; packet information.
|
|
* ifcid ; interface identifier (output).
|
|
* RETURNS
|
|
* gboolean ; TRUE if an interface identifier could
|
|
* be found.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static gboolean
|
|
lowpan_dldst_to_ifcid(packet_info *pinfo, guint8 *ifcid)
|
|
{
|
|
ieee802154_hints_t *hints;
|
|
|
|
/* Check the link-layer address field. */
|
|
if (pinfo->dl_dst.type == AT_EUI64) {
|
|
memcpy(ifcid, pinfo->dl_dst.data, LOWPAN_IFC_ID_LEN);
|
|
/* RFC2464: Invert the U/L bit when using an EUI64 address. */
|
|
ifcid[0] ^= 0x02;
|
|
return TRUE;
|
|
}
|
|
|
|
/* Lookup the IEEE 802.15.4 addressing hints. */
|
|
hints = (ieee802154_hints_t *)p_get_proto_data(wmem_file_scope(), pinfo,
|
|
proto_get_id_by_filter_name(IEEE802154_PROTOABBREV_WPAN), 0);
|
|
if (hints) {
|
|
|
|
/* Convert the 16-bit short address to an IID using the PAN ID (RFC 4944) or not depending on the preference */
|
|
if (rfc4944_short_address_format) {
|
|
lowpan_addr16_with_panid_to_ifcid(hints->src_pan, hints->dst16, ifcid);
|
|
} else {
|
|
lowpan_addr16_to_ifcid(hints->dst16, ifcid);
|
|
}
|
|
|
|
return TRUE;
|
|
} else {
|
|
/* Failed to find a link-layer destination address. */
|
|
memset(ifcid, 0, LOWPAN_IFC_ID_LEN);
|
|
return FALSE;
|
|
}
|
|
} /* lowpan_dldst_to_ifcid */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_reassemble_ipv6
|
|
* DESCRIPTION
|
|
* Helper function to rebuild an IPv6 packet from the IPv6
|
|
* header structure, and a list of next header structures.
|
|
* PARAMETERS
|
|
* ipv6 ; IPv6 Header.
|
|
* nhdr_list ; Next header list.
|
|
* RETURNS
|
|
* tvbuff_t * ; Reassembled IPv6 packet.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static tvbuff_t *
|
|
lowpan_reassemble_ipv6(tvbuff_t *tvb, packet_info *pinfo, struct ws_ip6_hdr *ipv6, struct lowpan_nhdr *nhdr_list)
|
|
{
|
|
gint length = 0;
|
|
gint reported = 0;
|
|
guint8 * buffer;
|
|
guint8 * cursor;
|
|
struct lowpan_nhdr *nhdr;
|
|
|
|
/* Compute the real and reported lengths. */
|
|
for (nhdr = nhdr_list; nhdr; nhdr = nhdr->next) {
|
|
length += nhdr->length;
|
|
reported += nhdr->reported;
|
|
}
|
|
ipv6->ip6h_plen = g_ntohs(reported);
|
|
|
|
/* Allocate a buffer for the packet and copy in the IPv6 header. */
|
|
buffer = (guint8 *)wmem_alloc(pinfo->pool, length + IPv6_HDR_SIZE);
|
|
memcpy(buffer, ipv6, IPv6_HDR_SIZE);
|
|
cursor = buffer + IPv6_HDR_SIZE;
|
|
|
|
/* Add the next headers into the buffer. */
|
|
for (nhdr = nhdr_list; nhdr; nhdr = nhdr->next) {
|
|
memcpy(cursor, LOWPAN_NHDR_DATA(nhdr), nhdr->length);
|
|
cursor += nhdr->length;
|
|
};
|
|
|
|
/* Return the reassembled packet. */
|
|
return tvb_new_child_real_data(tvb, buffer, length + IPv6_HDR_SIZE, reported + IPv6_HDR_SIZE);
|
|
} /* lowpan_reassemble_ipv6 */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* lowpan_parse_nhc_proto
|
|
* DESCRIPTION
|
|
* Parses the start of an 6LoWPAN NHC header to determine the
|
|
* next header protocol identifier. Will return IP_PROTO_NONE
|
|
* if no valid protocol could be determined.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* offset ; offset of the NHC.
|
|
* RETURNS
|
|
* guint8 ; IP_PROTO_* of the next header's protocol.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static guint8
|
|
lowpan_parse_nhc_proto(tvbuff_t *tvb, gint offset)
|
|
{
|
|
/* Ensure that at least one byte exists. */
|
|
if (!tvb_bytes_exist(tvb, offset, 1)) return IP_PROTO_NONE;
|
|
|
|
/* Check for IPv6 extension headers. */
|
|
if (tvb_get_bits8(tvb, offset<<3, LOWPAN_NHC_PATTERN_EXT_BITS) == LOWPAN_NHC_PATTERN_EXT) {
|
|
guint8 eid = (tvb_get_guint8(tvb, offset) & LOWPAN_NHC_EXT_EID) >> LOWPAN_NHC_EXT_EID_OFFSET;
|
|
switch (eid) {
|
|
case LOWPAN_NHC_EID_HOP_BY_HOP:
|
|
return IP_PROTO_HOPOPTS;
|
|
case LOWPAN_NHC_EID_ROUTING:
|
|
return IP_PROTO_ROUTING;
|
|
case LOWPAN_NHC_EID_FRAGMENT:
|
|
return IP_PROTO_FRAGMENT;
|
|
case LOWPAN_NHC_EID_DEST_OPTIONS:
|
|
return IP_PROTO_DSTOPTS;
|
|
case LOWPAN_NHC_EID_MOBILITY:
|
|
return IP_PROTO_MIPV6;
|
|
case LOWPAN_NHC_EID_IPV6:
|
|
return IP_PROTO_IPV6;
|
|
default:
|
|
/* Unknown protocol type. */
|
|
return IP_PROTO_NONE;
|
|
};
|
|
}
|
|
/* Check for compressed UDP headers. */
|
|
if (tvb_get_bits8(tvb, offset<<3, LOWPAN_NHC_PATTERN_UDP_BITS) == LOWPAN_NHC_PATTERN_UDP) {
|
|
return IP_PROTO_UDP;
|
|
}
|
|
/* Unknown header type. */
|
|
return IP_PROTO_NONE;
|
|
} /* lowpan_parse_nhc_proto */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_heur
|
|
* DESCRIPTION
|
|
* Heuristic dissector for 6LoWPAN. Checks if the pattern is
|
|
* a valid 6LoWPAN type, and not NALP.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; protocol display tree.
|
|
* data : ieee802154_packet,
|
|
* RETURNS
|
|
* boolean ; TRUE if the tvbuff was dissected as a
|
|
* 6LoWPAN packet. If this returns FALSE,
|
|
* then no dissection will be attempted.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static gboolean
|
|
dissect_6lowpan_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
|
|
{
|
|
guint offset = 0;
|
|
|
|
/* Check for valid patterns. */
|
|
for (;;) {
|
|
/* Parse patterns until we find a match. */
|
|
if (!tvb_reported_length_remaining(tvb, offset)) return FALSE;
|
|
if (tvb_get_bits8(tvb, offset*8, LOWPAN_PATTERN_IPV6_BITS) == LOWPAN_PATTERN_IPV6) break;
|
|
if (tvb_get_bits8(tvb, offset*8, LOWPAN_PATTERN_HC1_BITS) == LOWPAN_PATTERN_HC1) break;
|
|
if (tvb_get_bits8(tvb, offset*8, LOWPAN_PATTERN_BC0_BITS) == LOWPAN_PATTERN_BC0) {
|
|
/* Broadcast headers must be followed by another valid header. */
|
|
offset += 2;
|
|
continue;
|
|
}
|
|
if (tvb_get_bits8(tvb, offset*8, LOWPAN_PATTERN_IPHC_BITS) == LOWPAN_PATTERN_IPHC) break;
|
|
if (tvb_get_bits8(tvb, offset*8, LOWPAN_PATTERN_MESH_BITS) == LOWPAN_PATTERN_MESH) {
|
|
/* Mesh headers must be followed by another valid header. */
|
|
guint8 mesh = tvb_get_guint8(tvb, offset++);
|
|
offset += (mesh & LOWPAN_MESH_HEADER_V) ? 2 : 8;
|
|
offset += (mesh & LOWPAN_MESH_HEADER_F) ? 2 : 8;
|
|
if ((mesh & LOWPAN_MESH_HEADER_HOPS) == LOWPAN_MESH_HEADER_HOPS) offset++;
|
|
continue;
|
|
}
|
|
if (tvb_get_bits8(tvb, offset*8, LOWPAN_PATTERN_FRAG_BITS) == LOWPAN_PATTERN_FRAG1) {
|
|
/* First fragment headers must be followed by another valid header. */
|
|
offset += 4;
|
|
continue;
|
|
}
|
|
if (tvb_get_bits8(tvb, offset*8, LOWPAN_PATTERN_FRAG_BITS) == LOWPAN_PATTERN_FRAGN) break;
|
|
|
|
/* If we get here, then we couldn't match to any pattern. */
|
|
return FALSE;
|
|
} /* for */
|
|
|
|
/* If we get here, then we found a matching pattern. */
|
|
dissect_6lowpan(tvb, pinfo, tree, data);
|
|
return TRUE;
|
|
} /* dissect_6lowpan_heur */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan
|
|
* DESCRIPTION
|
|
* Dissector routine for 6LoWPAN packets.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; protocol display tree.
|
|
* data ; Packet data (ieee 802.15.4).
|
|
* RETURNS
|
|
* int ; Length of data processed, or 0 if not 6LoWPAN.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static int
|
|
dissect_6lowpan(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
proto_tree *lowpan_tree;
|
|
proto_item *lowpan_root;
|
|
tvbuff_t *next = tvb;
|
|
/* Interface identifier of the encapsulating layer. */
|
|
guint8 src_iid[LOWPAN_IFC_ID_LEN];
|
|
guint8 dst_iid[LOWPAN_IFC_ID_LEN];
|
|
|
|
/* Get the interface identifiers from the encapsulating layer. */
|
|
lowpan_dlsrc_to_ifcid(pinfo, src_iid);
|
|
lowpan_dldst_to_ifcid(pinfo, dst_iid);
|
|
|
|
/* Create the protocol tree. */
|
|
lowpan_root = proto_tree_add_protocol_format(tree, proto_6lowpan, tvb, 0, -1, "6LoWPAN");
|
|
lowpan_tree = proto_item_add_subtree(lowpan_root, ett_6lowpan);
|
|
|
|
/* Add the protocol name. */
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "6LoWPAN");
|
|
|
|
/* Mesh and Broadcast headers always come first in a 6LoWPAN frame. */
|
|
if (tvb_get_bits8(next, 0, LOWPAN_PATTERN_MESH_BITS) == LOWPAN_PATTERN_MESH) {
|
|
next = dissect_6lowpan_mesh(next, pinfo, lowpan_tree, src_iid, dst_iid);
|
|
if (!next) return tvb_captured_length(tvb);
|
|
}
|
|
if (tvb_get_bits8(next, 0, LOWPAN_PATTERN_BC0_BITS) == LOWPAN_PATTERN_BC0) {
|
|
next = dissect_6lowpan_bc0(next, pinfo, lowpan_tree);
|
|
if (!next) return tvb_captured_length(tvb);
|
|
}
|
|
|
|
/* After the mesh and broadcast headers, process dispatch codes recursively. */
|
|
/* Fragmentation headers.*/
|
|
if (tvb_get_bits8(next, 0, LOWPAN_PATTERN_FRAG_BITS) == LOWPAN_PATTERN_FRAG1) {
|
|
next = dissect_6lowpan_frag_first(next, pinfo, lowpan_tree, src_iid, dst_iid);
|
|
}
|
|
else if (tvb_get_bits8(next, 0, LOWPAN_PATTERN_FRAG_BITS) == LOWPAN_PATTERN_FRAGN) {
|
|
next = dissect_6lowpan_frag_middle(next, pinfo, lowpan_tree);
|
|
}
|
|
/* Uncompressed IPv6 packets. */
|
|
else if (tvb_get_bits8(next, 0, LOWPAN_PATTERN_IPV6_BITS) == LOWPAN_PATTERN_IPV6) {
|
|
next = dissect_6lowpan_ipv6(next, pinfo, lowpan_tree);
|
|
}
|
|
/* Compressed IPv6 packets. */
|
|
else if (tvb_get_bits8(next, 0, LOWPAN_PATTERN_HC1_BITS) == LOWPAN_PATTERN_HC1) {
|
|
next = dissect_6lowpan_hc1(next, pinfo, lowpan_tree, -1, src_iid, dst_iid);
|
|
}
|
|
else if (tvb_get_bits8(next, 0, LOWPAN_PATTERN_IPHC_BITS) == LOWPAN_PATTERN_IPHC) {
|
|
next = dissect_6lowpan_iphc(next, pinfo, lowpan_tree, -1, src_iid, dst_iid);
|
|
}
|
|
/* Unknown 6LoWPAN dispatch type */
|
|
else {
|
|
dissect_6lowpan_unknown(next, pinfo, lowpan_tree);
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
/* The last step should have returned an uncompressed IPv6 datagram. */
|
|
if (next) {
|
|
call_dissector(ipv6_handle, next, pinfo, tree);
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
} /* dissect_6lowpan */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_ipv6
|
|
* DESCRIPTION
|
|
* Dissector routine for an uncompressed IPv6 header type.
|
|
*
|
|
* This is one of the final encapsulation types, and will
|
|
* returned an uncompressed IPv6 datagram (or fragment
|
|
* thereof).
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* offset ; offset to the start of the header.
|
|
* RETURNS
|
|
* tvbuff_t * ; The remaining payload to be parsed.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static tvbuff_t *
|
|
dissect_6lowpan_ipv6(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
/* Get and display the pattern. */
|
|
proto_tree_add_bits_item(tree, hf_6lowpan_pattern,
|
|
tvb, 0, LOWPAN_PATTERN_IPV6_BITS, ENC_BIG_ENDIAN);
|
|
|
|
/* Create a tvbuff subset for the ipv6 datagram. */
|
|
return tvb_new_subset_remaining(tvb, 1);
|
|
} /* dissect_6lowpan_ipv6 */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_hc1
|
|
* DESCRIPTION
|
|
* Dissector routine for a 6LoWPAN HC1 header.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* dgram_size ; Datagram size (or <0 if not fragmented).
|
|
* siid ; Source Interface ID.
|
|
* diid ; Destination Interface ID.
|
|
* RETURNS
|
|
* tvbuff_t * ; The remaining payload to be parsed.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static tvbuff_t *
|
|
dissect_6lowpan_hc1(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint dgram_size, const guint8 *siid, const guint8 *diid)
|
|
{
|
|
gint offset = 0;
|
|
gint bit_offset;
|
|
int i;
|
|
guint8 hc1_encoding;
|
|
guint8 hc_udp_encoding = 0;
|
|
guint8 next_header;
|
|
proto_tree * hc_tree;
|
|
proto_item * hc_item;
|
|
tvbuff_t * ipv6_tvb;
|
|
/* IPv6 header. */
|
|
guint8 ipv6_class;
|
|
guint32 ipv6_flow;
|
|
struct ws_ip6_hdr ipv6;
|
|
struct lowpan_nhdr *nhdr_list;
|
|
static const int * hc1_encodings[] = {
|
|
&hf_6lowpan_hc1_source_prefix,
|
|
&hf_6lowpan_hc1_source_ifc,
|
|
&hf_6lowpan_hc1_dest_prefix,
|
|
&hf_6lowpan_hc1_dest_ifc,
|
|
&hf_6lowpan_hc1_class,
|
|
&hf_6lowpan_hc1_next,
|
|
&hf_6lowpan_hc1_more,
|
|
NULL
|
|
};
|
|
static const int * hc2_encodings[] = {
|
|
&hf_6lowpan_hc2_udp_src,
|
|
&hf_6lowpan_hc2_udp_dst,
|
|
&hf_6lowpan_hc2_udp_len,
|
|
NULL
|
|
};
|
|
|
|
/*=====================================================
|
|
* Parse HC Encoding Flags
|
|
*=====================================================
|
|
*/
|
|
/* Create a tree for the HC1 Header. */
|
|
hc_tree = proto_tree_add_subtree(tree, tvb, 0, 2, ett_6lowpan_hc1, &hc_item, "HC1 Encoding");
|
|
|
|
/* Get and display the pattern. */
|
|
proto_tree_add_bits_item(hc_tree, hf_6lowpan_pattern, tvb, 0, LOWPAN_PATTERN_HC1_BITS, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
/* Get and display the HC1 encoding bits. */
|
|
hc1_encoding = tvb_get_guint8(tvb, offset);
|
|
next_header = ((hc1_encoding & LOWPAN_HC1_NEXT) >> 1);
|
|
proto_tree_add_bitmask(hc_tree, tvb, offset, hf_6lowpan_hc1_encoding,
|
|
ett_6lowpan_hc1_encoding, hc1_encodings, ENC_NA);
|
|
offset += 1;
|
|
|
|
/* Get and display the HC2 encoding bits, if present. */
|
|
if (hc1_encoding & LOWPAN_HC1_MORE) {
|
|
if (next_header == LOWPAN_HC1_NEXT_UDP) {
|
|
hc_udp_encoding = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_bitmask(tree, tvb, offset, hf_6lowpan_hc2_udp_encoding,
|
|
ett_6lowpan_hc2_udp, hc2_encodings, ENC_NA);
|
|
offset += 1;
|
|
}
|
|
else {
|
|
/* HC1 states there are more bits, but an illegal next header was defined. */
|
|
expert_add_info(pinfo, hc_item, &ei_6lowpan_hc1_more_bits);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/*=====================================================
|
|
* Parse Uncompressed IPv6 Header Fields
|
|
*=====================================================
|
|
*/
|
|
/*
|
|
* And now all hell breaks loose. After the header encoding fields, we are
|
|
* left with an assortment of optional fields from the IPv6 header,
|
|
* depending on which fields are present or not, the headers may not be
|
|
* aligned to an octet boundary.
|
|
*
|
|
* From now on we have to parse the uncompressed fields relative to a bit
|
|
* offset.
|
|
*/
|
|
bit_offset = offset << 3;
|
|
|
|
/* Parse hop limit */
|
|
ipv6.ip6h_hlim = tvb_get_bits8(tvb, bit_offset, LOWPAN_IPV6_HOP_LIMIT_BITS);
|
|
proto_tree_add_uint(tree, hf_6lowpan_hop_limit, tvb, bit_offset>>3,
|
|
BITS_TO_BYTE_LEN(bit_offset, LOWPAN_IPV6_HOP_LIMIT_BITS), ipv6.ip6h_hlim);
|
|
bit_offset += LOWPAN_IPV6_HOP_LIMIT_BITS;
|
|
|
|
/*=====================================================
|
|
* Parse/Decompress IPv6 Source Address
|
|
*=====================================================
|
|
*/
|
|
offset = bit_offset;
|
|
if (!(hc1_encoding & LOWPAN_HC1_SOURCE_PREFIX)) {
|
|
for (i=0; i<8; i++, bit_offset += 8) {
|
|
ipv6.ip6h_src.bytes[i] = tvb_get_bits8(tvb, bit_offset, 8);
|
|
}
|
|
}
|
|
else {
|
|
memcpy(ipv6.ip6h_src.bytes, lowpan_llprefix, sizeof(lowpan_llprefix));
|
|
}
|
|
if (!(hc1_encoding & LOWPAN_HC1_SOURCE_IFC)) {
|
|
for (i=8; i<16; i++, bit_offset += 8) {
|
|
ipv6.ip6h_src.bytes[i] = tvb_get_bits8(tvb, bit_offset, 8);
|
|
}
|
|
}
|
|
else {
|
|
memcpy(&ipv6.ip6h_src.bytes[sizeof(ipv6.ip6h_src) - LOWPAN_IFC_ID_LEN], siid, LOWPAN_IFC_ID_LEN);
|
|
}
|
|
/* Display the source address. */
|
|
proto_tree_add_ipv6(tree, hf_6lowpan_source, tvb, offset>>3,
|
|
BITS_TO_BYTE_LEN(offset, (bit_offset-offset)), &ipv6.ip6h_src);
|
|
|
|
/*
|
|
* Do not set the address columns until after defragmentation, since we have
|
|
* to do decompression before reassembly, and changing the address will cause
|
|
* wireshark to think that the middle fragments came from another device.
|
|
*/
|
|
|
|
/*=====================================================
|
|
* Parse/Decompress IPv6 Destination Address
|
|
*=====================================================
|
|
*/
|
|
offset = bit_offset;
|
|
if (!(hc1_encoding & LOWPAN_HC1_DEST_PREFIX)) {
|
|
for (i=0; i<8; i++, bit_offset += 8) {
|
|
ipv6.ip6h_dst.bytes[i] = tvb_get_bits8(tvb, bit_offset, 8);
|
|
}
|
|
}
|
|
else {
|
|
memcpy(ipv6.ip6h_dst.bytes, lowpan_llprefix, sizeof(lowpan_llprefix));
|
|
}
|
|
if (!(hc1_encoding & LOWPAN_HC1_DEST_IFC)) {
|
|
for (i=8; i<16; i++, bit_offset += 8) {
|
|
ipv6.ip6h_dst.bytes[i] = tvb_get_bits8(tvb, bit_offset, 8);
|
|
}
|
|
}
|
|
else {
|
|
memcpy(&ipv6.ip6h_dst.bytes[sizeof(ipv6.ip6h_dst) - LOWPAN_IFC_ID_LEN], diid, LOWPAN_IFC_ID_LEN);
|
|
}
|
|
/* Display the destination address. */
|
|
proto_tree_add_ipv6(tree, hf_6lowpan_dest, tvb, offset>>3,
|
|
BITS_TO_BYTE_LEN(offset, (bit_offset-offset)), &ipv6.ip6h_dst);
|
|
|
|
/*
|
|
* Do not set the address columns until after defragmentation, since we have
|
|
* to do decompression before reassembly, and changing the address will cause
|
|
* wireshark to think that the middle fragments came from another device.
|
|
*/
|
|
|
|
/* Parse the traffic class and flow label. */
|
|
ipv6_class = 0;
|
|
ipv6_flow = 0;
|
|
if (!(hc1_encoding & LOWPAN_HC1_TRAFFIC_CLASS)) {
|
|
/* Parse the traffic class. */
|
|
ipv6_class = tvb_get_bits8(tvb, bit_offset, LOWPAN_IPV6_TRAFFIC_CLASS_BITS);
|
|
proto_tree_add_uint(tree, hf_6lowpan_traffic_class, tvb, bit_offset>>3,
|
|
BITS_TO_BYTE_LEN(bit_offset, LOWPAN_IPV6_TRAFFIC_CLASS_BITS), ipv6_class);
|
|
bit_offset += LOWPAN_IPV6_TRAFFIC_CLASS_BITS;
|
|
|
|
/* Parse the flow label. */
|
|
ipv6_flow = tvb_get_bits32(tvb, bit_offset, LOWPAN_IPV6_FLOW_LABEL_BITS, ENC_BIG_ENDIAN);
|
|
proto_tree_add_uint(tree, hf_6lowpan_flow_label, tvb, bit_offset>>3,
|
|
BITS_TO_BYTE_LEN(bit_offset, LOWPAN_IPV6_FLOW_LABEL_BITS), ipv6_flow);
|
|
bit_offset += LOWPAN_IPV6_FLOW_LABEL_BITS;
|
|
}
|
|
|
|
/* Rebuild the IPv6 flow label, traffic class and version fields. */
|
|
ipv6.ip6h_vc_flow = ipv6_flow;
|
|
ipv6.ip6h_vc_flow |= ((guint32)ipv6_class << LOWPAN_IPV6_FLOW_LABEL_BITS);
|
|
ipv6.ip6h_vc_flow |= ((guint32)0x6 << (LOWPAN_IPV6_TRAFFIC_CLASS_BITS + LOWPAN_IPV6_FLOW_LABEL_BITS));
|
|
ipv6.ip6h_vc_flow = g_ntohl(ipv6.ip6h_vc_flow);
|
|
|
|
/* Parse the IPv6 next header field. */
|
|
if (next_header == LOWPAN_HC1_NEXT_UDP) {
|
|
ipv6.ip6h_nxt = IP_PROTO_UDP;
|
|
}
|
|
else if (next_header == LOWPAN_HC1_NEXT_ICMP) {
|
|
ipv6.ip6h_nxt = IP_PROTO_ICMPV6;
|
|
}
|
|
else if (next_header == LOWPAN_HC1_NEXT_TCP) {
|
|
ipv6.ip6h_nxt = IP_PROTO_TCP;
|
|
}
|
|
else {
|
|
/* Parse the next header field. */
|
|
ipv6.ip6h_nxt = tvb_get_bits8(tvb, bit_offset, LOWPAN_IPV6_NEXT_HEADER_BITS);
|
|
proto_tree_add_uint_format_value(tree, hf_6lowpan_next_header, tvb, bit_offset>>3,
|
|
BITS_TO_BYTE_LEN(bit_offset, LOWPAN_IPV6_NEXT_HEADER_BITS), ipv6.ip6h_nxt,
|
|
"%s (0x%02x)", ipprotostr(ipv6.ip6h_nxt), ipv6.ip6h_nxt);
|
|
bit_offset += LOWPAN_IPV6_NEXT_HEADER_BITS;
|
|
}
|
|
|
|
/*=====================================================
|
|
* Parse and Reconstruct the UDP Header
|
|
*=====================================================
|
|
*/
|
|
if ((hc1_encoding & LOWPAN_HC1_MORE) && (next_header == LOWPAN_HC1_NEXT_UDP)) {
|
|
struct udp_hdr udp;
|
|
gint length;
|
|
|
|
/* Parse the source port. */
|
|
offset = bit_offset;
|
|
if (hc_udp_encoding & LOWPAN_HC2_UDP_SRCPORT) {
|
|
udp.src_port = tvb_get_bits8(tvb, bit_offset, LOWPAN_UDP_PORT_COMPRESSED_BITS) + LOWPAN_PORT_12BIT_OFFSET;
|
|
bit_offset += LOWPAN_UDP_PORT_COMPRESSED_BITS;
|
|
}
|
|
else {
|
|
udp.src_port = tvb_get_bits16(tvb, bit_offset, LOWPAN_UDP_PORT_BITS, ENC_BIG_ENDIAN);
|
|
bit_offset += LOWPAN_UDP_PORT_BITS;
|
|
}
|
|
proto_tree_add_uint(tree, hf_6lowpan_udp_src, tvb, offset>>3,
|
|
BITS_TO_BYTE_LEN(offset, (bit_offset-offset)), udp.src_port);
|
|
udp.src_port = g_ntohs(udp.src_port);
|
|
|
|
/* Parse the destination port. */
|
|
offset = bit_offset;
|
|
if (hc_udp_encoding & LOWPAN_HC2_UDP_DSTPORT) {
|
|
udp.dst_port = tvb_get_bits8(tvb, bit_offset, LOWPAN_UDP_PORT_COMPRESSED_BITS) + LOWPAN_PORT_12BIT_OFFSET;
|
|
bit_offset += LOWPAN_UDP_PORT_COMPRESSED_BITS;
|
|
}
|
|
else {
|
|
udp.dst_port = tvb_get_bits16(tvb, bit_offset, LOWPAN_UDP_PORT_BITS, ENC_BIG_ENDIAN);
|
|
bit_offset += LOWPAN_UDP_PORT_BITS;
|
|
}
|
|
proto_tree_add_uint(tree, hf_6lowpan_udp_dst, tvb, offset>>3,
|
|
BITS_TO_BYTE_LEN(offset, (bit_offset-offset)), udp.dst_port);
|
|
udp.dst_port = g_ntohs(udp.dst_port);
|
|
|
|
/* Parse the length, if present. */
|
|
if (!(hc_udp_encoding & LOWPAN_HC2_UDP_LENGTH)) {
|
|
udp.length = tvb_get_bits16(tvb, bit_offset, LOWPAN_UDP_LENGTH_BITS, ENC_BIG_ENDIAN);
|
|
proto_tree_add_uint(tree, hf_6lowpan_udp_len, tvb, bit_offset>>3,
|
|
BITS_TO_BYTE_LEN(bit_offset, LOWPAN_UDP_LENGTH_BITS), udp.length);
|
|
|
|
bit_offset += LOWPAN_UDP_LENGTH_BITS;
|
|
}
|
|
/* Compute the length from the fragmentation headers. */
|
|
else if (dgram_size >= 0) {
|
|
if (dgram_size < IPv6_HDR_SIZE) {
|
|
/* Datagram size is too small */
|
|
return NULL;
|
|
}
|
|
udp.length = dgram_size - IPv6_HDR_SIZE;
|
|
}
|
|
/* Compute the length from the tvbuff size. */
|
|
else {
|
|
udp.length = tvb_reported_length(tvb);
|
|
udp.length -= BITS_TO_BYTE_LEN(0, bit_offset + LOWPAN_UDP_CHECKSUM_BITS);
|
|
udp.length += (int)sizeof(struct udp_hdr);
|
|
}
|
|
udp.length = g_ntohs(udp.length);
|
|
|
|
/* Parse the checksum. */
|
|
udp.checksum = tvb_get_bits16(tvb, bit_offset, LOWPAN_UDP_CHECKSUM_BITS, ENC_BIG_ENDIAN);
|
|
proto_tree_add_uint(tree, hf_6lowpan_udp_checksum, tvb, bit_offset>>3,
|
|
BITS_TO_BYTE_LEN(bit_offset, LOWPAN_UDP_CHECKSUM_BITS), udp.checksum);
|
|
bit_offset += LOWPAN_UDP_CHECKSUM_BITS;
|
|
udp.checksum = g_ntohs(udp.checksum);
|
|
|
|
/* Construct the next header for the UDP datagram. */
|
|
offset = BITS_TO_BYTE_LEN(0, bit_offset);
|
|
length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
|
|
nhdr_list = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + sizeof(struct udp_hdr) + length);
|
|
nhdr_list->next = NULL;
|
|
nhdr_list->proto = IP_PROTO_UDP;
|
|
nhdr_list->length = length + (int)sizeof(struct udp_hdr);
|
|
nhdr_list->reported = g_ntohs(udp.length);
|
|
|
|
/* Copy the UDP header into the buffer. */
|
|
memcpy(LOWPAN_NHDR_DATA(nhdr_list), &udp, sizeof(struct udp_hdr));
|
|
tvb_memcpy(tvb, LOWPAN_NHDR_DATA(nhdr_list) + sizeof(struct udp_hdr), offset, length);
|
|
}
|
|
/*=====================================================
|
|
* Reconstruct the IPv6 Packet
|
|
*=====================================================
|
|
*/
|
|
else {
|
|
gint length;
|
|
offset = BITS_TO_BYTE_LEN(0, bit_offset);
|
|
length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
|
|
nhdr_list = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + length);
|
|
nhdr_list->next = NULL;
|
|
nhdr_list->proto = ipv6.ip6h_nxt;
|
|
nhdr_list->length = length;
|
|
if (dgram_size < 0) {
|
|
nhdr_list->reported = tvb_reported_length_remaining(tvb, offset);
|
|
}
|
|
else {
|
|
nhdr_list->reported = dgram_size - IPv6_HDR_SIZE;
|
|
}
|
|
tvb_memcpy(tvb, LOWPAN_NHDR_DATA(nhdr_list), offset, nhdr_list->length);
|
|
}
|
|
|
|
/* Link the reassembled tvbuff together. */
|
|
ipv6_tvb = lowpan_reassemble_ipv6(tvb, pinfo, &ipv6, nhdr_list);
|
|
|
|
/* Add a new data source for it. */
|
|
add_new_data_source(pinfo, ipv6_tvb, "Decompressed 6LoWPAN HC1");
|
|
|
|
return ipv6_tvb;
|
|
} /* dissect_6lowpan_hc1 */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_iphc
|
|
* DESCRIPTION
|
|
* Dissector routine for a 6LoWPAN IPHC header.
|
|
*
|
|
* This header is still in the draft phase, but is expected
|
|
* to replace HC1.
|
|
*
|
|
* See draft-ietf-6lowpan-hc-15.txt
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* dgram_size ; Datagram size (or <0 if not fragmented).
|
|
* siid ; Source Interface ID.
|
|
* diid ; Destination Interface ID.
|
|
* RETURNS
|
|
* tvbuff_t * ; The remaining payload to be parsed.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static tvbuff_t *
|
|
dissect_6lowpan_iphc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint dgram_size, const guint8 *siid, const guint8 *diid)
|
|
{
|
|
ieee802154_hints_t *hints;
|
|
guint16 hint_panid;
|
|
gint offset = 0;
|
|
gint length = 0;
|
|
proto_tree * iphc_tree;
|
|
proto_item * ti_dam = NULL;
|
|
/* IPHC header fields. */
|
|
guint16 iphc_flags;
|
|
guint8 iphc_traffic;
|
|
guint8 iphc_hop_limit;
|
|
guint8 iphc_src_mode;
|
|
guint8 iphc_dst_mode;
|
|
guint8 iphc_ctx = 0;
|
|
/* Contexts to use for address decompression. */
|
|
gint iphc_sci = LOWPAN_CONTEXT_DEFAULT;
|
|
gint iphc_dci = LOWPAN_CONTEXT_DEFAULT;
|
|
lowpan_context_data *sctx;
|
|
lowpan_context_data *dctx;
|
|
/* IPv6 header */
|
|
guint8 ipv6_dscp = 0;
|
|
guint8 ipv6_ecn = 0;
|
|
guint32 ipv6_flowlabel = 0;
|
|
struct ws_ip6_hdr ipv6;
|
|
tvbuff_t * ipv6_tvb;
|
|
/* Next header chain */
|
|
struct lowpan_nhdr *nhdr_list;
|
|
|
|
/* Lookup the IEEE 802.15.4 addressing hints. */
|
|
hints = (ieee802154_hints_t *)p_get_proto_data(wmem_file_scope(), pinfo,
|
|
proto_get_id_by_filter_name(IEEE802154_PROTOABBREV_WPAN), 0);
|
|
hint_panid = (hints) ? (hints->src_pan) : (IEEE802154_BCAST_PAN);
|
|
|
|
/* Create a tree for the IPHC header. */
|
|
iphc_tree = proto_tree_add_subtree(tree, tvb, 0, 2, ett_6lowpan_iphc, NULL, "IPHC Header");
|
|
|
|
/* Display the pattern. */
|
|
proto_tree_add_bits_item(iphc_tree, hf_6lowpan_pattern, tvb, 0, LOWPAN_PATTERN_IPHC_BITS, ENC_BIG_ENDIAN);
|
|
|
|
/*=====================================================
|
|
* Parse IPHC Header flags.
|
|
*=====================================================
|
|
*/
|
|
iphc_flags = tvb_get_ntohs(tvb, offset);
|
|
iphc_traffic = (iphc_flags & LOWPAN_IPHC_FLAG_FLOW) >> LOWPAN_IPHC_FLAG_OFFSET_FLOW;
|
|
iphc_hop_limit = (iphc_flags & LOWPAN_IPHC_FLAG_HLIM) >> LOWPAN_IPHC_FLAG_OFFSET_HLIM;
|
|
iphc_src_mode = (iphc_flags & LOWPAN_IPHC_FLAG_SRC_MODE) >> LOWPAN_IPHC_FLAG_OFFSET_SRC_MODE;
|
|
iphc_dst_mode = (iphc_flags & LOWPAN_IPHC_FLAG_DST_MODE) >> LOWPAN_IPHC_FLAG_OFFSET_DST_MODE;
|
|
if (tree) {
|
|
const value_string *am_vs;
|
|
proto_tree_add_uint (iphc_tree, hf_6lowpan_iphc_flag_tf, tvb, offset, 2, iphc_flags & LOWPAN_IPHC_FLAG_FLOW);
|
|
proto_tree_add_boolean (iphc_tree, hf_6lowpan_iphc_flag_nhdr, tvb, offset, 2, iphc_flags & LOWPAN_IPHC_FLAG_NHDR);
|
|
proto_tree_add_uint (iphc_tree, hf_6lowpan_iphc_flag_hlim, tvb, offset, 2, iphc_flags & LOWPAN_IPHC_FLAG_HLIM);
|
|
proto_tree_add_boolean (iphc_tree, hf_6lowpan_iphc_flag_cid, tvb, offset, 2, iphc_flags & LOWPAN_IPHC_FLAG_CONTEXT_ID);
|
|
proto_tree_add_boolean (iphc_tree, hf_6lowpan_iphc_flag_sac, tvb, offset, 2, iphc_flags & LOWPAN_IPHC_FLAG_SRC_COMP);
|
|
am_vs = iphc_flags & LOWPAN_IPHC_FLAG_SRC_COMP ? lowpan_iphc_saddr_stateful_modes : lowpan_iphc_addr_modes;
|
|
proto_tree_add_uint_format_value(iphc_tree, hf_6lowpan_iphc_flag_sam, tvb, offset, 2, iphc_flags & LOWPAN_IPHC_FLAG_SRC_MODE,
|
|
"%s (0x%04x)", val_to_str_const(iphc_src_mode, am_vs, "Reserved"), iphc_src_mode);
|
|
proto_tree_add_boolean (iphc_tree, hf_6lowpan_iphc_flag_mcast, tvb, offset, 2, iphc_flags & LOWPAN_IPHC_FLAG_MCAST_COMP);
|
|
proto_tree_add_boolean (iphc_tree, hf_6lowpan_iphc_flag_dac, tvb, offset, 2, iphc_flags & LOWPAN_IPHC_FLAG_DST_COMP);
|
|
/* Destination address mode changes meanings depending on multicast compression. */
|
|
if (iphc_flags & LOWPAN_IPHC_FLAG_MCAST_COMP) {
|
|
if (iphc_flags & LOWPAN_IPHC_FLAG_DST_COMP) {
|
|
am_vs = lowpan_iphc_mcast_stateful_modes;
|
|
} else {
|
|
am_vs = lowpan_iphc_mcast_modes;
|
|
}
|
|
} else {
|
|
if (iphc_flags & LOWPAN_IPHC_FLAG_DST_COMP) {
|
|
am_vs = lowpan_iphc_daddr_stateful_modes;
|
|
} else {
|
|
am_vs = lowpan_iphc_addr_modes;
|
|
}
|
|
}
|
|
ti_dam = proto_tree_add_uint_format_value(iphc_tree, hf_6lowpan_iphc_flag_dam, tvb, offset, 2,
|
|
iphc_flags & LOWPAN_IPHC_FLAG_DST_MODE, "%s (0x%04x)", val_to_str_const(iphc_dst_mode, am_vs, "Reserved"), iphc_dst_mode);
|
|
}
|
|
offset += 2;
|
|
|
|
/* Display the context identifier extension, if present. */
|
|
if (iphc_flags & LOWPAN_IPHC_FLAG_CONTEXT_ID) {
|
|
iphc_ctx = tvb_get_guint8(tvb, offset);
|
|
iphc_sci = (iphc_ctx & LOWPAN_IPHC_FLAG_SCI) >> LOWPAN_IPHC_FLAG_OFFSET_SCI;
|
|
iphc_dci = (iphc_ctx & LOWPAN_IPHC_FLAG_DCI) >> LOWPAN_IPHC_FLAG_OFFSET_DCI;
|
|
proto_tree_add_uint(iphc_tree, hf_6lowpan_iphc_sci, tvb, offset, 1, iphc_ctx & LOWPAN_IPHC_FLAG_SCI);
|
|
proto_tree_add_uint(iphc_tree, hf_6lowpan_iphc_dci, tvb, offset, 1, iphc_ctx & LOWPAN_IPHC_FLAG_DCI);
|
|
offset += 1;
|
|
}
|
|
/* Use link-local contexts if stateless. */
|
|
if (!(iphc_flags & LOWPAN_IPHC_FLAG_SRC_COMP)) {
|
|
iphc_sci = LOWPAN_CONTEXT_LINK_LOCAL;
|
|
}
|
|
if (!(iphc_flags & LOWPAN_IPHC_FLAG_DST_COMP)) {
|
|
iphc_dci = LOWPAN_CONTEXT_LINK_LOCAL;
|
|
}
|
|
/* Lookup the contexts. */
|
|
/*
|
|
* Don't display their origin until after we decompress the address in case
|
|
* the address modes indicate that we should use a different context.
|
|
*/
|
|
sctx = lowpan_context_find(iphc_sci, hint_panid);
|
|
dctx = lowpan_context_find(iphc_dci, hint_panid);
|
|
|
|
/*=====================================================
|
|
* Parse Traffic Class and Flow Label
|
|
*=====================================================
|
|
*/
|
|
offset <<= 3;
|
|
/* Parse the ECN field. */
|
|
if (iphc_traffic != LOWPAN_IPHC_FLOW_COMPRESSED) {
|
|
ipv6_ecn = tvb_get_bits8(tvb, offset, LOWPAN_IPHC_ECN_BITS);
|
|
proto_tree_add_bits_item(tree, hf_6lowpan_ecn, tvb, offset, LOWPAN_IPHC_ECN_BITS, ENC_BIG_ENDIAN);
|
|
offset += LOWPAN_IPHC_ECN_BITS;
|
|
}
|
|
/* Parse the DSCP field. */
|
|
if ((iphc_traffic == LOWPAN_IPHC_FLOW_CLASS_LABEL) || (iphc_traffic == LOWPAN_IPHC_FLOW_CLASS)) {
|
|
ipv6_dscp = tvb_get_bits8(tvb, offset, LOWPAN_IPHC_DSCP_BITS);
|
|
proto_tree_add_bits_item(tree, hf_6lowpan_dscp, tvb, offset, LOWPAN_IPHC_DSCP_BITS, LOWPAN_IPHC_DSCP_BITS);
|
|
offset += LOWPAN_IPHC_DSCP_BITS;
|
|
}
|
|
/* Add a generated entry to show the IPv6 traffic class byte. */
|
|
if (ipv6_dscp || ipv6_ecn) {
|
|
proto_item *tclass_item;
|
|
tclass_item = proto_tree_add_uint(tree, hf_6lowpan_traffic_class, tvb, 0, 0,
|
|
(ipv6_dscp << LOWPAN_IPHC_ECN_BITS) | ipv6_ecn);
|
|
PROTO_ITEM_SET_GENERATED(tclass_item);
|
|
}
|
|
|
|
/* Parse the flow label. */
|
|
if ((iphc_traffic == LOWPAN_IPHC_FLOW_CLASS_LABEL) || (iphc_traffic == LOWPAN_IPHC_FLOW_ECN_LABEL)) {
|
|
/* Pad to 4-bits past the start of the byte. */
|
|
guint pad_bits = ((4 - offset) & 0x7);
|
|
if (pad_bits) {
|
|
proto_tree_add_bits_item(tree, hf_6lowpan_padding, tvb, offset, pad_bits, ENC_BIG_ENDIAN);
|
|
}
|
|
offset += pad_bits;
|
|
ipv6_flowlabel = tvb_get_bits32(tvb, offset, LOWPAN_IPHC_LABEL_BITS, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(tree, hf_6lowpan_flow_label, tvb, offset, LOWPAN_IPHC_LABEL_BITS, ENC_BIG_ENDIAN);
|
|
offset += LOWPAN_IPHC_LABEL_BITS;
|
|
}
|
|
|
|
/* Rebuild the IPv6 flow label, traffic class and version fields. */
|
|
ipv6.ip6h_vc_flow = ipv6_flowlabel;
|
|
ipv6.ip6h_vc_flow |= ((guint32)ipv6_ecn << LOWPAN_IPV6_FLOW_LABEL_BITS);
|
|
ipv6.ip6h_vc_flow |= ((guint32)ipv6_dscp << (LOWPAN_IPHC_ECN_BITS + LOWPAN_IPV6_FLOW_LABEL_BITS));
|
|
ipv6.ip6h_vc_flow |= ((guint32)0x6 << (LOWPAN_IPV6_TRAFFIC_CLASS_BITS + LOWPAN_IPV6_FLOW_LABEL_BITS));
|
|
ipv6.ip6h_vc_flow = g_ntohl(ipv6.ip6h_vc_flow);
|
|
|
|
/* Convert back to byte offsets. */
|
|
offset >>= 3;
|
|
|
|
/*=====================================================
|
|
* Parse Next Header and Hop Limit
|
|
*=====================================================
|
|
*/
|
|
/* Get the next header field, if present. */
|
|
if (!(iphc_flags & LOWPAN_IPHC_FLAG_NHDR)) {
|
|
ipv6.ip6h_nxt = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint_format_value(tree, hf_6lowpan_next_header, tvb, offset, 1, ipv6.ip6h_nxt,
|
|
"%s (0x%02x)", ipprotostr(ipv6.ip6h_nxt), ipv6.ip6h_nxt);
|
|
offset += 1;
|
|
}
|
|
|
|
/* Get the hop limit field, if present. */
|
|
if (iphc_hop_limit == LOWPAN_IPHC_HLIM_1) {
|
|
ipv6.ip6h_hlim = 1;
|
|
}
|
|
else if (iphc_hop_limit == LOWPAN_IPHC_HLIM_64) {
|
|
ipv6.ip6h_hlim = 64;
|
|
}
|
|
else if (iphc_hop_limit == LOWPAN_IPHC_HLIM_255) {
|
|
ipv6.ip6h_hlim = 255;
|
|
}
|
|
else {
|
|
ipv6.ip6h_hlim = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(tree, hf_6lowpan_hop_limit, tvb, offset, 1, ipv6.ip6h_hlim);
|
|
offset += 1;
|
|
}
|
|
|
|
/*=====================================================
|
|
* Parse and decompress the source address.
|
|
*=====================================================
|
|
*/
|
|
length = 0;
|
|
memset(&ipv6.ip6h_src, 0, sizeof(ipv6.ip6h_src));
|
|
/* (SAC=1 && SAM=00) -> the unspecified address (::). */
|
|
if ((iphc_flags & LOWPAN_IPHC_FLAG_SRC_COMP) && (iphc_src_mode == LOWPAN_IPHC_ADDR_SRC_UNSPEC)) {
|
|
sctx = &lowpan_context_default;
|
|
}
|
|
/* The IID is derived from the encapsulating layer. */
|
|
else if (iphc_src_mode == LOWPAN_IPHC_ADDR_COMPRESSED) {
|
|
memcpy(&ipv6.ip6h_src.bytes[sizeof(ipv6.ip6h_src) - LOWPAN_IFC_ID_LEN], siid, LOWPAN_IFC_ID_LEN);
|
|
}
|
|
/* Full Address inline. */
|
|
else if (iphc_src_mode == LOWPAN_IPHC_ADDR_FULL_INLINE) {
|
|
if (!(iphc_flags & LOWPAN_IPHC_FLAG_SRC_COMP)) sctx = &lowpan_context_default;
|
|
length = (int)sizeof(ipv6.ip6h_src);
|
|
tvb_memcpy(tvb, &ipv6.ip6h_src, offset, length);
|
|
}
|
|
/* 64-bits inline. */
|
|
else if (iphc_src_mode == LOWPAN_IPHC_ADDR_64BIT_INLINE) {
|
|
length = 8;
|
|
tvb_memcpy(tvb, &ipv6.ip6h_src.bytes[sizeof(ipv6.ip6h_src) - length], offset, length);
|
|
}
|
|
/* 16-bits inline. */
|
|
else if (iphc_src_mode == LOWPAN_IPHC_ADDR_16BIT_INLINE) {
|
|
length = 2;
|
|
/* Format becomes ff:fe00:xxxx */
|
|
ipv6.ip6h_src.bytes[11] = 0xff;
|
|
ipv6.ip6h_src.bytes[12] = 0xfe;
|
|
tvb_memcpy(tvb, &ipv6.ip6h_src.bytes[sizeof(ipv6.ip6h_src) - length], offset, length);
|
|
|
|
}
|
|
/* Copy the context bits. */
|
|
lowpan_pfxcpy(&ipv6.ip6h_src, &sctx->prefix, sctx->plen);
|
|
/* Update the IID of the encapsulating layer. */
|
|
siid = &ipv6.ip6h_src.bytes[sizeof(ipv6.ip6h_src) - LOWPAN_IFC_ID_LEN];
|
|
|
|
/* Display the source IPv6 address. */
|
|
proto_tree_add_ipv6(tree, hf_6lowpan_source, tvb, offset, length, &ipv6.ip6h_src);
|
|
|
|
/* Add information about where the context came from. */
|
|
/* TODO: We should display the prefix length too. */
|
|
if (sctx->plen) {
|
|
proto_item *ti;
|
|
ti = proto_tree_add_ipv6(iphc_tree, hf_6lowpan_iphc_sctx_prefix, tvb, 0, 0, &sctx->prefix);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
if ( sctx->frame ) {
|
|
ti = proto_tree_add_uint(iphc_tree, hf_6lowpan_iphc_sctx_origin, tvb, 0, 0, sctx->frame);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
}
|
|
}
|
|
offset += length;
|
|
/*
|
|
* Do not set the address columns until after defragmentation, since we have
|
|
* to do decompression before reassembly, and changing the address will cause
|
|
* wireshark to think that the middle fragments came from another device.
|
|
*/
|
|
|
|
/*=====================================================
|
|
* Parse and decompress a multicast address.
|
|
*=====================================================
|
|
*/
|
|
length = 0;
|
|
memset(&ipv6.ip6h_dst, 0, sizeof(ipv6.ip6h_dst));
|
|
/* Stateless multicast compression. */
|
|
if ((iphc_flags & LOWPAN_IPHC_FLAG_MCAST_COMP) && !(iphc_flags & LOWPAN_IPHC_FLAG_DST_COMP)) {
|
|
if (iphc_dst_mode == LOWPAN_IPHC_ADDR_FULL_INLINE) {
|
|
length = (int)sizeof(ipv6.ip6h_dst);
|
|
tvb_memcpy(tvb, &ipv6.ip6h_dst.bytes[sizeof(ipv6.ip6h_dst) - length], offset, length);
|
|
}
|
|
else if (iphc_dst_mode == LOWPAN_IPHC_MCAST_48BIT) {
|
|
ipv6.ip6h_dst.bytes[0] = 0xff;
|
|
ipv6.ip6h_dst.bytes[1] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[11] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[12] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[13] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[14] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[15] = tvb_get_guint8(tvb, offset + (length++));
|
|
}
|
|
else if (iphc_dst_mode == LOWPAN_IPHC_MCAST_32BIT) {
|
|
ipv6.ip6h_dst.bytes[0] = 0xff;
|
|
ipv6.ip6h_dst.bytes[1] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[13] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[14] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[15] = tvb_get_guint8(tvb, offset + (length++));
|
|
}
|
|
else if (iphc_dst_mode == LOWPAN_IPHC_MCAST_8BIT) {
|
|
ipv6.ip6h_dst.bytes[0] = 0xff;
|
|
ipv6.ip6h_dst.bytes[1] = 0x02;
|
|
ipv6.ip6h_dst.bytes[15] = tvb_get_guint8(tvb, offset + (length++));
|
|
}
|
|
else {
|
|
/* Illegal destination address compression mode. */
|
|
expert_add_info(pinfo, ti_dam, &ei_6lowpan_illegal_dest_addr_mode);
|
|
return NULL;
|
|
}
|
|
}
|
|
/* Stateful multicast compression. */
|
|
else if ((iphc_flags & LOWPAN_IPHC_FLAG_MCAST_COMP) && (iphc_flags & LOWPAN_IPHC_FLAG_DST_COMP)) {
|
|
if (iphc_dst_mode == LOWPAN_IPHC_MCAST_STATEFUL_48BIT) {
|
|
/* RFC 3306 unicast-prefix based multicast address of the form:
|
|
* ffXX:XXLL:PPPP:PPPP:PPPP:PPPP:XXXX:XXXX
|
|
* XX = inline byte.
|
|
* LL = prefix/context length (up to 64-bits).
|
|
* PP = prefix/context byte.
|
|
*/
|
|
ipv6.ip6h_dst.bytes[0] = 0xff;
|
|
ipv6.ip6h_dst.bytes[1] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[2] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[3] = (dctx->plen > 64) ? (64) : (dctx->plen);
|
|
memcpy(&ipv6.ip6h_dst.bytes[4], &dctx->prefix, 8);
|
|
ipv6.ip6h_dst.bytes[12] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[13] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[14] = tvb_get_guint8(tvb, offset + (length++));
|
|
ipv6.ip6h_dst.bytes[15] = tvb_get_guint8(tvb, offset + (length++));
|
|
}
|
|
else {
|
|
/* Illegal destination address compression mode. */
|
|
expert_add_info(pinfo, ti_dam, &ei_6lowpan_illegal_dest_addr_mode);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/*=====================================================
|
|
* Parse and decompress a unicast destination address.
|
|
*=====================================================
|
|
*/
|
|
else {
|
|
/* (DAC=1 && DAM=00) -> reserved value. */
|
|
if ((iphc_flags & LOWPAN_IPHC_FLAG_DST_COMP) && (iphc_dst_mode == LOWPAN_IPHC_ADDR_FULL_INLINE)) {
|
|
/* Illegal destination address compression mode. */
|
|
expert_add_info(pinfo, ti_dam, &ei_6lowpan_illegal_dest_addr_mode);
|
|
return NULL;
|
|
}
|
|
/* The IID is derived from the link-layer source. */
|
|
else if (iphc_dst_mode == LOWPAN_IPHC_ADDR_COMPRESSED) {
|
|
memcpy(&ipv6.ip6h_dst.bytes[sizeof(ipv6.ip6h_dst) - LOWPAN_IFC_ID_LEN], diid, LOWPAN_IFC_ID_LEN);
|
|
}
|
|
/* Full Address inline. */
|
|
else if (iphc_dst_mode == LOWPAN_IPHC_ADDR_FULL_INLINE) {
|
|
dctx = &lowpan_context_default;
|
|
length = (int)sizeof(ipv6.ip6h_dst);
|
|
tvb_memcpy(tvb, &ipv6.ip6h_dst, offset, length);
|
|
}
|
|
/* 64-bits inline. */
|
|
else if (iphc_dst_mode == LOWPAN_IPHC_ADDR_64BIT_INLINE) {
|
|
length = 8;
|
|
tvb_memcpy(tvb, &ipv6.ip6h_dst.bytes[sizeof(ipv6.ip6h_dst) - length], offset, length);
|
|
}
|
|
/* 16-bits inline. */
|
|
else if (iphc_dst_mode == LOWPAN_IPHC_ADDR_16BIT_INLINE) {
|
|
length = 2;
|
|
/* Format becomes ff:fe00:xxxx */
|
|
ipv6.ip6h_dst.bytes[11] = 0xff;
|
|
ipv6.ip6h_dst.bytes[12] = 0xfe;
|
|
tvb_memcpy(tvb, &ipv6.ip6h_dst.bytes[sizeof(ipv6.ip6h_dst) - length], offset, length);
|
|
}
|
|
/* Copy the context bits. */
|
|
lowpan_pfxcpy(&ipv6.ip6h_dst, &dctx->prefix, dctx->plen);
|
|
/* Update the interface id of the encapsulating layer. */
|
|
diid = &ipv6.ip6h_dst.bytes[sizeof(ipv6.ip6h_dst) - LOWPAN_IFC_ID_LEN];
|
|
}
|
|
|
|
/* Display the destination IPv6 address. */
|
|
proto_tree_add_ipv6(tree, hf_6lowpan_dest, tvb, offset, length, &ipv6.ip6h_dst);
|
|
|
|
/* Add information about where the context came from. */
|
|
/* TODO: We should display the prefix length too. */
|
|
if (dctx->plen) {
|
|
proto_item *ti;
|
|
ti = proto_tree_add_ipv6(iphc_tree, hf_6lowpan_iphc_dctx_prefix, tvb, 0, 0, &dctx->prefix);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
if ( dctx->frame ) {
|
|
ti = proto_tree_add_uint(iphc_tree, hf_6lowpan_iphc_dctx_origin, tvb, 0, 0, dctx->frame);
|
|
PROTO_ITEM_SET_GENERATED(ti);
|
|
}
|
|
}
|
|
offset += length;
|
|
/*
|
|
* Do not set the address columns until after defragmentation, since we have
|
|
* to do decompression before reassembly, and changing the address will cause
|
|
* wireshark to think that the middle fragments came from another device.
|
|
*/
|
|
|
|
/*=====================================================
|
|
* Decompress extension headers.
|
|
*=====================================================
|
|
*/
|
|
/* Parse the list of extension headers. */
|
|
if (iphc_flags & LOWPAN_IPHC_FLAG_NHDR) {
|
|
/* Parse the next header protocol identifier. */
|
|
ipv6.ip6h_nxt = lowpan_parse_nhc_proto(tvb, offset);
|
|
|
|
/* Parse the 6LoWPAN NHC fields. */
|
|
nhdr_list = dissect_6lowpan_iphc_nhc(tvb, pinfo, tree, offset, dgram_size - IPv6_HDR_SIZE, siid, diid);
|
|
}
|
|
/* Create an extension header for the remaining payload. */
|
|
else {
|
|
length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
|
|
nhdr_list = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + length);
|
|
nhdr_list->next = NULL;
|
|
nhdr_list->proto = ipv6.ip6h_nxt;
|
|
nhdr_list->length = length;
|
|
if (dgram_size < 0) {
|
|
nhdr_list->reported = tvb_reported_length_remaining(tvb, offset);
|
|
}
|
|
else {
|
|
nhdr_list->reported = dgram_size - IPv6_HDR_SIZE;
|
|
}
|
|
tvb_memcpy(tvb, LOWPAN_NHDR_DATA(nhdr_list), offset, nhdr_list->length);
|
|
}
|
|
|
|
/*=====================================================
|
|
* Rebuild the IPv6 packet.
|
|
*=====================================================
|
|
*/
|
|
/* Reassemble the IPv6 packet. */
|
|
ipv6_tvb = lowpan_reassemble_ipv6(tvb, pinfo, &ipv6, nhdr_list);
|
|
|
|
/* Add a new data source for it. */
|
|
add_new_data_source(pinfo, ipv6_tvb, "Decompressed 6LoWPAN IPHC");
|
|
|
|
return ipv6_tvb;
|
|
} /* dissect_6lowpan_iphc */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_iphc_nhc
|
|
* DESCRIPTION
|
|
* Dissector routine for a 6LoWPAN IPHC next header structure(s).
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* offset ; packet buffer offset.
|
|
* dgram_size ; Remaining datagram size (or <0 if unknown).
|
|
* siid ; Source Interface ID.
|
|
* diid ; Destination Interface ID.
|
|
* RETURNS
|
|
* lowpan_nhdr * ; List of wmem_alloc'd next header structures.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static struct lowpan_nhdr *
|
|
dissect_6lowpan_iphc_nhc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gint offset, gint dgram_size, const guint8 *siid, const guint8 *diid)
|
|
{
|
|
gint length;
|
|
proto_item * ti = NULL;
|
|
proto_tree * nhc_tree = NULL;
|
|
struct lowpan_nhdr *nhdr;
|
|
|
|
/*=====================================================
|
|
* IP-in-IP Tunneling
|
|
*=====================================================
|
|
*/
|
|
if (tvb_get_bits8(tvb, offset<<3, LOWPAN_NHC_PATTERN_EXT_IPV6_BITS) == LOWPAN_NHC_PATTERN_EXT_IPV6) {
|
|
guint8 ext_flags;
|
|
tvbuff_t *iphc_tvb;
|
|
|
|
/* Create a tree for the IPv6 extension header. */
|
|
nhc_tree = proto_tree_add_subtree(tree, tvb, offset, 2, ett_6lowpan_nhc_ext, &ti, "IPv6 extension header");
|
|
/* Display the IPv6 Extension Header NHC ID pattern. */
|
|
proto_tree_add_bits_item(nhc_tree, hf_6lowpan_nhc_pattern, tvb, offset<<3, LOWPAN_NHC_PATTERN_EXT_BITS, ENC_BIG_ENDIAN);
|
|
|
|
/* Get and display the extension header compression flags. */
|
|
ext_flags = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(nhc_tree, hf_6lowpan_nhc_ext_eid, tvb, offset, 1, ext_flags & LOWPAN_NHC_EXT_EID);
|
|
proto_tree_add_boolean(nhc_tree, hf_6lowpan_nhc_ext_nh, tvb, offset, 1, ext_flags & LOWPAN_NHC_EXT_NHDR);
|
|
if (ext_flags & LOWPAN_NHC_EXT_NHDR) {
|
|
/* TODO: Flag a warning, the NH bit MUST be 0 when EID==0x7 (IP-in-IP). */
|
|
}
|
|
offset += 1;
|
|
|
|
/* Decode the remainder of the packet using IPHC encoding. */
|
|
iphc_tvb = dissect_6lowpan_iphc(tvb_new_subset_remaining(tvb, offset), pinfo, tree, dgram_size, siid, diid);
|
|
if (!iphc_tvb) return NULL;
|
|
|
|
/* Create the next header structure for the tunneled IPv6 header. */
|
|
nhdr = (struct lowpan_nhdr *)wmem_alloc0(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + tvb_captured_length(iphc_tvb));
|
|
nhdr->next = NULL;
|
|
nhdr->proto = IP_PROTO_IPV6;
|
|
nhdr->length = tvb_captured_length(iphc_tvb);
|
|
nhdr->reported = tvb_reported_length(iphc_tvb);
|
|
tvb_memcpy(iphc_tvb, LOWPAN_NHDR_DATA(nhdr), 0, nhdr->length);
|
|
return nhdr;
|
|
}
|
|
/*=====================================================
|
|
* IPv6 Extension Header
|
|
*=====================================================
|
|
*/
|
|
if (tvb_get_bits8(tvb, offset<<3, LOWPAN_NHC_PATTERN_EXT_BITS) == LOWPAN_NHC_PATTERN_EXT) {
|
|
struct ip6_ext ipv6_ext = {0, 0};
|
|
guint8 ext_flags;
|
|
guint8 ext_hlen;
|
|
guint8 ext_len;
|
|
guint8 ext_proto;
|
|
proto_item *ti_ext_len = NULL;
|
|
|
|
/* Parse the IPv6 extension header protocol. */
|
|
ext_proto = lowpan_parse_nhc_proto(tvb, offset);
|
|
|
|
/* Create a tree for the IPv6 extension header. */
|
|
nhc_tree = proto_tree_add_subtree(tree, tvb, offset, 2, ett_6lowpan_nhc_ext, NULL, "IPv6 extension header");
|
|
/* Display the IPv6 Extension Header NHC ID pattern. */
|
|
proto_tree_add_bits_item(nhc_tree, hf_6lowpan_nhc_pattern, tvb, offset<<3, LOWPAN_NHC_PATTERN_EXT_BITS, ENC_BIG_ENDIAN);
|
|
|
|
/* Get and display the extension header compression flags. */
|
|
ext_flags = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(nhc_tree, hf_6lowpan_nhc_ext_eid, tvb, offset, 1, ext_flags & LOWPAN_NHC_EXT_EID);
|
|
proto_tree_add_boolean(nhc_tree, hf_6lowpan_nhc_ext_nh, tvb, offset, 1, ext_flags & LOWPAN_NHC_EXT_NHDR);
|
|
offset += 1;
|
|
|
|
/* Get and display the next header field, if present. */
|
|
if (!(ext_flags & LOWPAN_NHC_EXT_NHDR)) {
|
|
ipv6_ext.ip6e_nxt = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint_format_value(nhc_tree, hf_6lowpan_nhc_ext_next, tvb, offset, 1, ipv6_ext.ip6e_nxt,
|
|
"%s (0x%02x)", ipprotostr(ipv6_ext.ip6e_nxt), ipv6_ext.ip6e_nxt);
|
|
proto_item_set_end(ti, tvb, offset+1);
|
|
offset += 1;
|
|
}
|
|
|
|
if (ext_proto == IP_PROTO_FRAGMENT) {
|
|
/* Fragment header has a reserved byte in place of the Length field. */
|
|
ext_hlen = 1;
|
|
length = (guint8)sizeof(struct ip6_frag);
|
|
ext_len = length - ext_hlen;
|
|
|
|
proto_tree_add_uint(nhc_tree, hf_6lowpan_nhc_ext_reserved, tvb, offset, 1, tvb_get_guint8(tvb, offset));
|
|
|
|
} else {
|
|
/* Get and display the extension header length. */
|
|
ext_hlen = (guint8)sizeof(struct ip6_ext);
|
|
ext_len = tvb_get_guint8(tvb, offset);
|
|
ti_ext_len = proto_tree_add_uint(nhc_tree, hf_6lowpan_nhc_ext_length, tvb, offset, 1, ext_len);
|
|
offset += 1;
|
|
|
|
/* Compute the length of the extension header padded to an 8-byte alignment. */
|
|
length = ext_hlen + ext_len;
|
|
length = (length + 7) & ~0x7;
|
|
ipv6_ext.ip6e_len = length>>3; /* Convert to units of 8 bytes. */
|
|
ipv6_ext.ip6e_len -= 1; /* Don't include the first 8 bytes. */
|
|
}
|
|
|
|
/* Create the next header structure for the IPv6 extension header. */
|
|
nhdr = (struct lowpan_nhdr *)wmem_alloc0(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + length);
|
|
nhdr->next = NULL;
|
|
nhdr->proto = ext_proto;
|
|
nhdr->length = length;
|
|
nhdr->reported = length;
|
|
|
|
/* Add the IPv6 extension header to the buffer. */
|
|
if (ext_flags & LOWPAN_NHC_EXT_NHDR) {
|
|
ipv6_ext.ip6e_nxt = lowpan_parse_nhc_proto(tvb, offset+ext_len);
|
|
}
|
|
memcpy(LOWPAN_NHDR_DATA(nhdr), &ipv6_ext, ext_hlen);
|
|
|
|
/*
|
|
* If the extension header was truncated, display the remainder using
|
|
* the data dissector, and end NHC dissection here.
|
|
*/
|
|
if (!tvb_bytes_exist(tvb, offset, ext_len)) {
|
|
/* Call the data dissector for the remainder. */
|
|
call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo, nhc_tree);
|
|
|
|
/* Copy the remainder, and truncate the real buffer length. */
|
|
nhdr->length = tvb_captured_length_remaining(tvb, offset) + ext_hlen;
|
|
tvb_memcpy(tvb, LOWPAN_NHDR_DATA(nhdr) + ext_hlen, offset, tvb_captured_length_remaining(tvb, offset));
|
|
|
|
/* There is nothing more we can do. */
|
|
return nhdr;
|
|
}
|
|
|
|
if (ext_proto == IP_PROTO_FRAGMENT) {
|
|
/* Display the extension header using the data dissector. */
|
|
call_data_dissector(tvb_new_subset_length(tvb, offset+1, ext_len-1), pinfo, nhc_tree);
|
|
} else {
|
|
/* Display the extension header using the data dissector. */
|
|
call_data_dissector(tvb_new_subset_length(tvb, offset, ext_len), pinfo, nhc_tree);
|
|
}
|
|
|
|
/* Copy the extension header into the struct. */
|
|
tvb_memcpy(tvb, LOWPAN_NHDR_DATA(nhdr) + ext_hlen, offset, ext_len);
|
|
offset += ext_len;
|
|
|
|
/* Add padding option */
|
|
if (length > ext_hlen + ext_len) {
|
|
guint8 padding = length - (ext_hlen + ext_len);
|
|
guint8 *pad_ptr = LOWPAN_NHDR_DATA(nhdr) + ext_hlen + ext_len;
|
|
if (ext_proto != IP_PROTO_HOPOPTS && ext_proto != IP_PROTO_DSTOPTS) {
|
|
expert_add_info(pinfo, ti_ext_len, &ei_6lowpan_bad_ext_header_length);
|
|
}
|
|
if (padding == 1) {
|
|
pad_ptr[0] = IP6OPT_PAD1;
|
|
} else {
|
|
pad_ptr[0] = IP6OPT_PADN;
|
|
pad_ptr[1] = padding - 2;
|
|
/* No need to write pad data, as buffer is zero-initialised */
|
|
}
|
|
}
|
|
|
|
if (ext_flags & LOWPAN_NHC_EXT_NHDR) {
|
|
/*
|
|
* There are more LOWPAN_NHC structures to parse. Call ourself again
|
|
* recursively to parse them and build the linked list.
|
|
*/
|
|
nhdr->next = dissect_6lowpan_iphc_nhc(tvb, pinfo, tree, offset, dgram_size - nhdr->reported, siid, diid);
|
|
}
|
|
else if (ipv6_ext.ip6e_nxt != IP_PROTO_NONE) {
|
|
/* Create another next header structure for the remaining payload. */
|
|
length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
|
|
nhdr->next = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + length);
|
|
nhdr->next->next = NULL;
|
|
nhdr->next->proto = ipv6_ext.ip6e_nxt;
|
|
nhdr->next->length = length;
|
|
if (dgram_size < 0) {
|
|
nhdr->next->reported = tvb_reported_length_remaining(tvb, offset);
|
|
}
|
|
else {
|
|
nhdr->next->reported = dgram_size - nhdr->reported;
|
|
}
|
|
tvb_memcpy(tvb, LOWPAN_NHDR_DATA(nhdr->next), offset, nhdr->next->length);
|
|
}
|
|
|
|
/* Done. */
|
|
return nhdr;
|
|
}
|
|
/*=====================================================
|
|
* UDP Header
|
|
*=====================================================
|
|
*/
|
|
if (tvb_get_bits8(tvb, offset<<3, LOWPAN_NHC_PATTERN_UDP_BITS) == LOWPAN_NHC_PATTERN_UDP) {
|
|
struct udp_hdr udp;
|
|
gint src_bitlen;
|
|
gint dst_bitlen;
|
|
guint8 udp_flags;
|
|
|
|
/* Create a tree for the UDP header. */
|
|
nhc_tree = proto_tree_add_subtree(tree, tvb, 0, 1, ett_6lowpan_nhc_udp, NULL, "UDP header compression");
|
|
/* Display the UDP NHC ID pattern. */
|
|
proto_tree_add_bits_item(nhc_tree, hf_6lowpan_nhc_pattern, tvb, offset<<3, LOWPAN_NHC_PATTERN_UDP_BITS, ENC_BIG_ENDIAN);
|
|
|
|
/* Get and display the UDP header compression options */
|
|
udp_flags = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_boolean(nhc_tree, hf_6lowpan_nhc_udp_checksum, tvb, offset, 1, udp_flags & LOWPAN_NHC_UDP_CHECKSUM);
|
|
proto_tree_add_boolean(nhc_tree, hf_6lowpan_nhc_udp_src, tvb, offset, 1, udp_flags & LOWPAN_NHC_UDP_SRCPORT);
|
|
proto_tree_add_boolean(nhc_tree, hf_6lowpan_nhc_udp_dst, tvb, offset, 1, udp_flags & LOWPAN_NHC_UDP_DSTPORT);
|
|
offset += 1;
|
|
|
|
/* Get and display the ports. */
|
|
switch (udp_flags & (LOWPAN_NHC_UDP_SRCPORT | LOWPAN_NHC_UDP_DSTPORT)) {
|
|
case (LOWPAN_NHC_UDP_SRCPORT | LOWPAN_NHC_UDP_DSTPORT):
|
|
udp.src_port = LOWPAN_PORT_12BIT_OFFSET + (tvb_get_guint8(tvb, offset) >> 4);
|
|
udp.dst_port = LOWPAN_PORT_12BIT_OFFSET + (tvb_get_guint8(tvb, offset) & 0x0f);
|
|
src_bitlen = 4;
|
|
dst_bitlen = 4;
|
|
break;
|
|
|
|
case LOWPAN_NHC_UDP_SRCPORT:
|
|
udp.src_port = LOWPAN_PORT_8BIT_OFFSET + tvb_get_guint8(tvb, offset);
|
|
udp.dst_port = tvb_get_ntohs(tvb, offset + 1);
|
|
src_bitlen = 8;
|
|
dst_bitlen = 16;
|
|
break;
|
|
|
|
case LOWPAN_NHC_UDP_DSTPORT:
|
|
udp.src_port = tvb_get_ntohs(tvb, offset);
|
|
udp.dst_port = LOWPAN_PORT_8BIT_OFFSET + tvb_get_guint8(tvb, offset + 2);
|
|
src_bitlen = 16;
|
|
dst_bitlen = 8;
|
|
break;
|
|
|
|
default:
|
|
udp.src_port = tvb_get_ntohs(tvb, offset);
|
|
udp.dst_port = tvb_get_ntohs(tvb, offset+2);
|
|
src_bitlen = 16;
|
|
dst_bitlen = 16;
|
|
break;
|
|
} /* switch */
|
|
|
|
proto_tree_add_uint(tree, hf_6lowpan_udp_src, tvb, offset, BITS_TO_BYTE_LEN(offset<<3, src_bitlen), udp.src_port);
|
|
proto_tree_add_uint(tree, hf_6lowpan_udp_dst, tvb, offset+(src_bitlen>>3), BITS_TO_BYTE_LEN((offset<<3)+src_bitlen, dst_bitlen), udp.dst_port);
|
|
offset += ((src_bitlen + dst_bitlen)>>3);
|
|
udp.src_port = g_ntohs(udp.src_port);
|
|
udp.dst_port = g_ntohs(udp.dst_port);
|
|
|
|
/* Get and display the checksum. */
|
|
if (!(udp_flags & LOWPAN_NHC_UDP_CHECKSUM)) {
|
|
/* Parse the checksum. */
|
|
udp.checksum = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_checksum(tree, tvb, offset, hf_6lowpan_udp_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
|
|
offset += 2;
|
|
}
|
|
else {
|
|
udp.checksum = 0;
|
|
}
|
|
|
|
/* Compute the datagram length. */
|
|
if (dgram_size < 0) {
|
|
length = tvb_reported_length_remaining(tvb, offset);
|
|
udp.length = g_htons(length + (int)sizeof(struct udp_hdr));
|
|
}
|
|
else {
|
|
udp.length = g_htons(dgram_size);
|
|
}
|
|
|
|
/*
|
|
* Although rfc768 (udp) allows a packet to be sent with a checksum of
|
|
* 0 to mean that no checksum was computed, apparently IPv6 specifically
|
|
* disallows sending UDP datagrams without checksums. Likewise, 6LoWPAN
|
|
* requires that we recompute the checksum.
|
|
*
|
|
* If the datagram is incomplete, then leave the checksum at 0.
|
|
*/
|
|
#if 0
|
|
/*
|
|
* This has been disabled, since we might only be dissecting a fragment
|
|
* of the packet, and thus we might not have the entire UDP payload at
|
|
* this time.
|
|
*
|
|
* If we want to display the checksums, they will have to be recomputed
|
|
* after packet reassembly. Lots of work for not much gain, since we can
|
|
* just set the UDP checksum to 0 and Wireshark doesn't care.
|
|
*/
|
|
if ((udp_flags & LOWPAN_NHC_UDP_CHECKSUM) && tvb_bytes_exist(tvb, offset, length)) {
|
|
vec_t cksum_vec[3];
|
|
struct {
|
|
struct e_in6_addr src;
|
|
struct e_in6_addr dst;
|
|
guint32 length;
|
|
guint8 zero[3];
|
|
guint8 proto;
|
|
} cksum_phdr;
|
|
|
|
/* Fill in the pseudo-header. */
|
|
memcpy(&cksum_phdr.src, pinfo->src.data, sizeof(struct e_in6_addr));
|
|
memcpy(&cksum_phdr.dst, pinfo->dst.data, sizeof(struct e_in6_addr));
|
|
cksum_phdr.length = g_htonl(length + (int)sizeof(struct udp_hdr));
|
|
memset(cksum_phdr.zero, 0, sizeof(cksum_phdr.zero));
|
|
cksum_phdr.proto = IP_PROTO_UDP;
|
|
|
|
/* Compute the checksum. */
|
|
SET_CKSUM_VEC_PTR(cksum_vec[0], (const guint8 *)&cksum_phdr, sizeof(cksum_phdr));
|
|
SET_CKSUM_VEC_PTR(cksum_vec[1], (const guint8 *)&udp, sizeof(struct udp_hdr));
|
|
SET_CKSUM_VEC_TVB(cksum_vec[2], tvb, offset, length);
|
|
udp.checksum = in_cksum(cksum_vec, 3);
|
|
if (udp.checksum == 0) udp.checksum = 0xffff;
|
|
}
|
|
#endif
|
|
|
|
/* Create the next header structure for the UDP datagram. */
|
|
length = (gint)tvb_ensure_captured_length_remaining(tvb, offset);
|
|
nhdr = (struct lowpan_nhdr *)wmem_alloc(wmem_packet_scope(), sizeof(struct lowpan_nhdr) + sizeof(struct udp_hdr) + length);
|
|
nhdr->next = NULL;
|
|
nhdr->proto = IP_PROTO_UDP;
|
|
nhdr->length = length + (int)sizeof(struct udp_hdr);
|
|
nhdr->reported = g_ntohs(udp.length);
|
|
|
|
/* Copy the UDP header and payload into the buffer. */
|
|
memcpy(LOWPAN_NHDR_DATA(nhdr), &udp, sizeof(struct udp_hdr));
|
|
tvb_memcpy(tvb, LOWPAN_NHDR_DATA(nhdr) + sizeof(struct udp_hdr), offset, tvb_captured_length_remaining(tvb, offset));
|
|
return nhdr;
|
|
}
|
|
/*=====================================================
|
|
* Unknown Next Header Type
|
|
*=====================================================
|
|
*/
|
|
return NULL;
|
|
} /* dissect_6lowpan_iphc_nhc */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_bc0
|
|
* DESCRIPTION
|
|
* Dissector routine for a 6LoWPAN broadcast header.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* RETURNS
|
|
* tvbuff_t * ; The remaining payload to be parsed.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static tvbuff_t *
|
|
dissect_6lowpan_bc0(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
guint8 seqnum;
|
|
proto_tree * bcast_tree;
|
|
|
|
/* Create a tree for the broadcast header. */
|
|
bcast_tree = proto_tree_add_subtree(tree, tvb, 0, 2, ett_6lowpan_bcast, NULL, "Broadcast Header");
|
|
|
|
/* Get and display the pattern. */
|
|
proto_tree_add_bits_item(bcast_tree, hf_6lowpan_pattern, tvb, 0, LOWPAN_PATTERN_BC0_BITS, ENC_BIG_ENDIAN);
|
|
|
|
/* Get and display the sequence number. */
|
|
seqnum = tvb_get_guint8(tvb, 1);
|
|
proto_tree_add_uint(bcast_tree, hf_6lowpan_bcast_seqnum, tvb, 1, 1, seqnum);
|
|
|
|
/* Return the remaining buffer. */
|
|
return tvb_new_subset_remaining(tvb, 2);
|
|
} /* dissect_6lowpan_bc0 */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_mesh
|
|
* DESCRIPTION
|
|
* Dissector routine for a 6LoWPAN mesh header.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* offset ; offset to the start of the header.
|
|
* siid ; Source Interface ID.
|
|
* diid ; Destination Interface ID.
|
|
* RETURNS
|
|
* tvbuff_t * ; The remaining payload to be parsed.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static tvbuff_t *
|
|
dissect_6lowpan_mesh(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint8 *siid, guint8 *diid)
|
|
{
|
|
gint offset = 0;
|
|
guint8 mesh_header;
|
|
proto_tree * mesh_tree;
|
|
proto_tree * flag_tree;
|
|
proto_item * ti;
|
|
|
|
ieee802154_hints_t *hints;
|
|
|
|
/* Create a tree for the mesh header. */
|
|
mesh_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_6lowpan_mesh, &ti, "Mesh Header");
|
|
|
|
/* Get and display the mesh flags. */
|
|
mesh_header = tvb_get_guint8(tvb, offset);
|
|
|
|
/* Create the mesh header subtree. */
|
|
flag_tree = proto_tree_add_subtree(mesh_tree, tvb, offset, 1, ett_6lowpan_mesh, NULL, "Flags");
|
|
|
|
/* Add the mesh header fields. */
|
|
proto_tree_add_bits_item(flag_tree, hf_6lowpan_pattern, tvb, offset * 8, LOWPAN_PATTERN_MESH_BITS, ENC_BIG_ENDIAN);
|
|
proto_tree_add_boolean(flag_tree, hf_6lowpan_mesh_v, tvb, offset, 1, mesh_header & LOWPAN_MESH_HEADER_V);
|
|
proto_tree_add_boolean(flag_tree, hf_6lowpan_mesh_f, tvb, offset, 1, mesh_header & LOWPAN_MESH_HEADER_F);
|
|
proto_tree_add_uint(flag_tree, hf_6lowpan_mesh_hops, tvb, offset, 1, mesh_header & LOWPAN_MESH_HEADER_HOPS);
|
|
offset += 1;
|
|
|
|
if ((mesh_header & LOWPAN_MESH_HEADER_HOPS) == LOWPAN_MESH_HEADER_HOPS) {
|
|
proto_tree_add_item(mesh_tree, hf_6lowpan_mesh_hops8, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
}
|
|
|
|
/* Get and display the originator address. */
|
|
if (!(mesh_header & LOWPAN_MESH_HEADER_V)) {
|
|
proto_tree_add_item(mesh_tree, hf_6lowpan_mesh_orig64,
|
|
tvb, offset, 8, ENC_BIG_ENDIAN);
|
|
|
|
set_address_tvb(&pinfo->src, AT_EUI64, 8, tvb, offset);
|
|
copy_address_shallow(&pinfo->net_src, &pinfo->src);
|
|
|
|
/* Update source IID */
|
|
tvb_memcpy(tvb, siid, offset, LOWPAN_IFC_ID_LEN);
|
|
/* RFC2464: Invert the U/L bit when using an EUI64 address. */
|
|
siid[0] ^= 0x02;
|
|
offset += 8;
|
|
}
|
|
else {
|
|
guint16 addr16 = tvb_get_ntohs(tvb, offset);
|
|
guint8 * ifcid;
|
|
|
|
proto_tree_add_uint(mesh_tree, hf_6lowpan_mesh_orig16, tvb, offset, 2, addr16);
|
|
ifcid = (guint8 *)wmem_alloc(pinfo->pool, 8);
|
|
|
|
/* Lookup the IEEE 802.15.4 addressing hints wanting RFC 2464 compatibility. */
|
|
hints = (ieee802154_hints_t *)p_get_proto_data(wmem_file_scope(), pinfo,
|
|
proto_get_id_by_filter_name(IEEE802154_PROTOABBREV_WPAN), 0);
|
|
|
|
/* Convert the 16-bit short address to an IID using the PAN ID (RFC 4944) or not depending on the preference and the presence of hints from lower layers */
|
|
if (hints && rfc4944_short_address_format) {
|
|
lowpan_addr16_with_panid_to_ifcid(hints->src_pan, addr16, ifcid);
|
|
} else {
|
|
lowpan_addr16_to_ifcid(addr16, ifcid);
|
|
}
|
|
|
|
set_address(&pinfo->src, AT_EUI64, 8, ifcid);
|
|
copy_address_shallow(&pinfo->net_src, &pinfo->src);
|
|
|
|
/* Update source IID */
|
|
memcpy(siid, ifcid, LOWPAN_IFC_ID_LEN);
|
|
offset += 2;
|
|
}
|
|
|
|
/* Get and display the destination address. */
|
|
if (!(mesh_header & LOWPAN_MESH_HEADER_F)) {
|
|
proto_tree_add_item(mesh_tree, hf_6lowpan_mesh_dest64,
|
|
tvb, offset, 8, ENC_BIG_ENDIAN);
|
|
|
|
set_address_tvb(&pinfo->dst, AT_EUI64, 8, tvb, offset);
|
|
copy_address_shallow(&pinfo->net_dst, &pinfo->dst);
|
|
|
|
/* Update destination IID */
|
|
tvb_memcpy(tvb, diid, offset, LOWPAN_IFC_ID_LEN);
|
|
/* RFC2464: Invert the U/L bit when using an EUI64 address. */
|
|
diid[0] ^= 0x02;
|
|
offset += 8;
|
|
}
|
|
else {
|
|
guint16 addr16 = tvb_get_ntohs(tvb, offset);
|
|
guint8 * ifcid;
|
|
|
|
proto_tree_add_uint(mesh_tree, hf_6lowpan_mesh_dest16, tvb, offset, 2, addr16);
|
|
|
|
ifcid = (guint8 *)wmem_alloc(pinfo->pool, 8);
|
|
|
|
/* Lookup the IEEE 802.15.4 addressing hints wanting RFC 2464 compatibility. */
|
|
hints = (ieee802154_hints_t *)p_get_proto_data(wmem_file_scope(), pinfo,
|
|
proto_get_id_by_filter_name(IEEE802154_PROTOABBREV_WPAN), 0);
|
|
|
|
/* Convert the 16-bit short address to an IID using the PAN ID (RFC 4944) or not depending on the preference and the presence of hints from lower layers */
|
|
if (hints && rfc4944_short_address_format) {
|
|
lowpan_addr16_with_panid_to_ifcid(hints->src_pan, addr16, ifcid);
|
|
} else {
|
|
lowpan_addr16_to_ifcid(addr16, ifcid);
|
|
}
|
|
|
|
set_address(&pinfo->dst, AT_EUI64, 8, ifcid);
|
|
copy_address_shallow(&pinfo->net_dst, &pinfo->dst);
|
|
|
|
/* Update destination IID */
|
|
memcpy(diid, ifcid, LOWPAN_IFC_ID_LEN);
|
|
offset += 2;
|
|
}
|
|
|
|
/* Adjust the mesh header length. */
|
|
proto_item_set_end(ti, tvb, offset);
|
|
|
|
/* Return the remaining buffer. */
|
|
return tvb_new_subset_remaining(tvb, offset);
|
|
} /* dissect_6lowpan_mesh */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_frag_first
|
|
* DESCRIPTION
|
|
* Dissector routine for a 6LoWPAN FRAG1 headers.
|
|
*
|
|
* If reassembly could be completed, this should return an
|
|
* uncompressed IPv6 packet. If reassembly had to be delayed
|
|
* for more packets, this will return NULL.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* siid ; Source Interface ID.
|
|
* diid ; Destination Interface ID.
|
|
* RETURNS
|
|
* tvbuff_t * ; reassembled IPv6 packet.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static tvbuff_t *
|
|
dissect_6lowpan_frag_first(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, const guint8 *siid, const guint8 *diid)
|
|
{
|
|
gint offset = 0;
|
|
gint frag_size;
|
|
guint16 dgram_size;
|
|
guint16 dgram_tag;
|
|
proto_tree * frag_tree;
|
|
proto_item * ti;
|
|
proto_item * length_item;
|
|
/* Reassembly parameters. */
|
|
tvbuff_t * new_tvb;
|
|
tvbuff_t * frag_tvb;
|
|
fragment_head * frag_data;
|
|
gboolean save_fragmented;
|
|
|
|
/* Create a tree for the fragmentation header. */
|
|
frag_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_6lowpan_frag, &ti, "Fragmentation Header");
|
|
|
|
/* Get and display the pattern and datagram size. */
|
|
dgram_size = tvb_get_bits16(tvb, (offset * 8) + LOWPAN_PATTERN_FRAG_BITS, LOWPAN_FRAG_DGRAM_SIZE_BITS, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(frag_tree, hf_6lowpan_pattern, tvb, offset * 8, LOWPAN_PATTERN_FRAG_BITS, ENC_BIG_ENDIAN);
|
|
length_item = proto_tree_add_uint(frag_tree, hf_6lowpan_frag_dgram_size, tvb, offset, 2, dgram_size);
|
|
offset += 2;
|
|
|
|
/* Get and display the datagram tag. */
|
|
dgram_tag = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_uint(frag_tree, hf_6lowpan_frag_dgram_tag, tvb, offset, 2, dgram_tag);
|
|
offset += 2;
|
|
|
|
/* Adjust the fragmentation header length. */
|
|
proto_item_set_end(ti, tvb, offset);
|
|
|
|
/* The first fragment can contain an uncompressed IPv6, HC1 or IPHC fragment. */
|
|
frag_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
if (tvb_get_bits8(frag_tvb, 0, LOWPAN_PATTERN_IPV6_BITS) == LOWPAN_PATTERN_IPV6) {
|
|
frag_tvb = dissect_6lowpan_ipv6(frag_tvb, pinfo, tree);
|
|
}
|
|
else if (tvb_get_bits8(frag_tvb, 0, LOWPAN_PATTERN_HC1_BITS) == LOWPAN_PATTERN_HC1) {
|
|
/* Check if the datagram size is sane. */
|
|
if (dgram_size < IPv6_HDR_SIZE) {
|
|
expert_add_info_format(pinfo, length_item, &ei_6lowpan_bad_ipv6_header_length,
|
|
"Length is less than IPv6 header length %u", IPv6_HDR_SIZE);
|
|
}
|
|
frag_tvb = dissect_6lowpan_hc1(frag_tvb, pinfo, tree, dgram_size, siid, diid);
|
|
}
|
|
else if (tvb_get_bits8(frag_tvb, 0, LOWPAN_PATTERN_IPHC_BITS) == LOWPAN_PATTERN_IPHC) {
|
|
/* Check if the datagram size is sane. */
|
|
if (dgram_size < IPv6_HDR_SIZE) {
|
|
expert_add_info_format(pinfo, length_item, &ei_6lowpan_bad_ipv6_header_length,
|
|
"Length is less than IPv6 header length %u", IPv6_HDR_SIZE);
|
|
}
|
|
frag_tvb = dissect_6lowpan_iphc(frag_tvb, pinfo, tree, dgram_size, siid, diid);
|
|
}
|
|
/* Unknown 6LoWPAN dispatch type */
|
|
else {
|
|
dissect_6lowpan_unknown(frag_tvb, pinfo, tree);
|
|
return NULL;
|
|
}
|
|
|
|
/* Check call to dissect_6lowpan_xxx was successful */
|
|
if (frag_tvb == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
/* Add this datagram to the fragment table. */
|
|
frag_size = tvb_captured_length(frag_tvb);
|
|
tvb_set_reported_length(frag_tvb, frag_size);
|
|
save_fragmented = pinfo->fragmented;
|
|
pinfo->fragmented = TRUE;
|
|
frag_data = fragment_add_check(&lowpan_reassembly_table,
|
|
frag_tvb, 0, pinfo, dgram_tag, NULL,
|
|
0, frag_size, (frag_size < dgram_size));
|
|
|
|
/* Attempt reassembly. */
|
|
new_tvb = process_reassembled_data(frag_tvb, 0, pinfo,
|
|
"Reassembled 6LoWPAN", frag_data, &lowpan_frag_items,
|
|
NULL, tree);
|
|
|
|
pinfo->fragmented = save_fragmented;
|
|
|
|
if (new_tvb) {
|
|
/* Reassembly was successful; return the completed datagram. */
|
|
return new_tvb;
|
|
} else {
|
|
/* Reassembly was unsuccessful; show this fragment. This may
|
|
just mean that we don't yet have all the fragments, so
|
|
we should not just continue dissecting. */
|
|
call_data_dissector(frag_tvb, pinfo, proto_tree_get_root(tree));
|
|
return NULL;
|
|
}
|
|
} /* dissect_6lowpan_frag_first */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_frag_middle
|
|
* DESCRIPTION
|
|
* Dissector routine for a 6LoWPAN FRAGN headers.
|
|
*
|
|
* If reassembly could be completed, this should return an
|
|
* uncompressed IPv6 packet. If reassembly had to be delayed
|
|
* for more packets, this will return NULL.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* RETURNS
|
|
* tvbuff_t * ; reassembled IPv6 packet.
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static tvbuff_t *
|
|
dissect_6lowpan_frag_middle(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
gint offset = 0;
|
|
gint frag_size;
|
|
guint16 dgram_size;
|
|
guint16 dgram_tag;
|
|
guint16 dgram_offset = 0;
|
|
proto_tree * frag_tree;
|
|
proto_item * ti;
|
|
/* Reassembly parameters. */
|
|
tvbuff_t * new_tvb;
|
|
fragment_head * frag_data;
|
|
gboolean save_fragmented;
|
|
|
|
/* Create a tree for the fragmentation header. */
|
|
frag_tree = proto_tree_add_subtree(tree, tvb, offset, 0, ett_6lowpan_frag, &ti, "Fragmentation Header");
|
|
|
|
/* Get and display the pattern and datagram size. */
|
|
dgram_size = tvb_get_bits16(tvb, (offset * 8) + LOWPAN_PATTERN_FRAG_BITS, LOWPAN_FRAG_DGRAM_SIZE_BITS, ENC_BIG_ENDIAN);
|
|
proto_tree_add_bits_item(frag_tree, hf_6lowpan_pattern, tvb, offset * 8, LOWPAN_PATTERN_FRAG_BITS, ENC_BIG_ENDIAN);
|
|
proto_tree_add_uint(frag_tree, hf_6lowpan_frag_dgram_size, tvb, offset, 2, dgram_size);
|
|
offset += 2;
|
|
|
|
/* Get and display the datagram tag. */
|
|
dgram_tag = tvb_get_ntohs(tvb, offset);
|
|
proto_tree_add_uint(frag_tree, hf_6lowpan_frag_dgram_tag, tvb, offset, 2, dgram_tag);
|
|
offset += 2;
|
|
|
|
/* Get and display the datagram offset. */
|
|
dgram_offset = tvb_get_guint8(tvb, offset) * 8;
|
|
proto_tree_add_uint(frag_tree, hf_6lowpan_frag_dgram_offset, tvb, offset, 1, dgram_offset);
|
|
offset += 1;
|
|
|
|
/* Adjust the fragmentation header length. */
|
|
frag_size = tvb_reported_length_remaining(tvb, offset);
|
|
proto_item_set_end(ti, tvb, offset);
|
|
|
|
/* Add this datagram to the fragment table. */
|
|
save_fragmented = pinfo->fragmented;
|
|
pinfo->fragmented = TRUE;
|
|
frag_data = fragment_add_check(&lowpan_reassembly_table,
|
|
tvb, offset, pinfo, dgram_tag, NULL,
|
|
dgram_offset, frag_size, ((dgram_offset + frag_size) < dgram_size));
|
|
|
|
/* Attempt reassembly. */
|
|
new_tvb = process_reassembled_data(tvb, offset, pinfo,
|
|
"Reassembled 6LoWPAN", frag_data, &lowpan_frag_items,
|
|
NULL, tree);
|
|
|
|
pinfo->fragmented = save_fragmented;
|
|
|
|
/* If reassembly was successful, then return the completed datagram. */
|
|
if (new_tvb) {
|
|
return new_tvb;
|
|
}
|
|
/* If reassembly failed, display the payload fragment using the data dissector. */
|
|
else {
|
|
new_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
call_data_dissector(new_tvb, pinfo, proto_tree_get_root(tree));
|
|
return NULL;
|
|
}
|
|
} /* dissect_6lowpan_frag_middle */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* dissect_6lowpan_unknown
|
|
* DESCRIPTION
|
|
* Dissector routine for 6LoWPAN packets after encountering
|
|
* an unknown header.
|
|
* PARAMETERS
|
|
* tvb ; packet buffer.
|
|
* pinfo ; packet info.
|
|
* tree ; 6LoWPAN display tree.
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
void
|
|
dissect_6lowpan_unknown(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
tvbuff_t * data_tvb;
|
|
|
|
/* Get and display the pattern. */
|
|
|
|
/* Give a special case for NALP. */
|
|
if (tvb_get_bits8(tvb, 0, LOWPAN_PATTERN_IPHC_BITS) == LOWPAN_PATTERN_IPHC) {
|
|
proto_tree_add_bits_item(tree, hf_6lowpan_pattern, tvb, 0, LOWPAN_PATTERN_IPHC_BITS, ENC_BIG_ENDIAN);
|
|
}
|
|
else {
|
|
guint8 pattern = tvb_get_guint8(tvb, 0);
|
|
proto_tree_add_uint_bits_format_value(tree, hf_6lowpan_pattern, tvb, 0, 8, pattern, "Unknown (0x%02x)", pattern);
|
|
}
|
|
|
|
/* Create a tvbuff subset for the remaining data. */
|
|
data_tvb = tvb_new_subset_remaining(tvb, 1);
|
|
call_data_dissector(data_tvb, pinfo, proto_tree_get_root(tree));
|
|
} /* dissect_6lowpan_unknown */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* proto_register_6lowpan
|
|
* DESCRIPTION
|
|
* Protocol registration routine for 6LoWPAN. Called during
|
|
* Wireshark initialization.
|
|
* PARAMETERS
|
|
* none ;
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
void
|
|
proto_register_6lowpan(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
/* Common 6LoWPAN fields. */
|
|
{ &hf_6lowpan_pattern,
|
|
{ "Pattern", "6lowpan.pattern",
|
|
FT_UINT8, BASE_HEX, VALS(lowpan_patterns), 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_nhc_pattern,
|
|
{ "Pattern", "6lowpan.nhc.pattern",
|
|
FT_UINT8, BASE_HEX, VALS(lowpan_nhc_patterns), 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_padding,
|
|
{ "Padding", "6lowpan.padding",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
|
|
/* HC1 header fields. */
|
|
{ &hf_6lowpan_hc1_encoding,
|
|
{ "HC1 Encoding", "6lowpan.hc1.encoding",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc1_source_prefix,
|
|
{ "Source prefix", "6lowpan.hc1.src_prefix",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_HC1_SOURCE_PREFIX, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc1_source_ifc,
|
|
{ "Source interface", "6lowpan.hc1.src_ifc",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_HC1_SOURCE_IFC, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc1_dest_prefix,
|
|
{ "Destination prefix", "6lowpan.hc1.dst_prefix",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_HC1_DEST_PREFIX, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc1_dest_ifc,
|
|
{ "Destination interface", "6lowpan.hc1.dst_ifc",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_HC1_DEST_IFC, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc1_class,
|
|
{ "Traffic class and flow label", "6lowpan.hc1.class",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_HC1_TRAFFIC_CLASS, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc1_next,
|
|
{ "Next header", "6lowpan.hc1.next",
|
|
FT_UINT8, BASE_HEX, VALS(lowpan_hc1_next), LOWPAN_HC1_NEXT, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc1_more,
|
|
{ "More HC bits", "6lowpan.hc1.more",
|
|
FT_BOOLEAN, 8, NULL, LOWPAN_HC1_MORE, NULL, HFILL }},
|
|
|
|
/* HC_UDP header fields. */
|
|
{ &hf_6lowpan_hc2_udp_encoding,
|
|
{ "HC_UDP Encoding", "6lowpan.hc2.udp.encoding",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc2_udp_src,
|
|
{ "Source port", "6lowpan.hc2.udp.src",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_HC2_UDP_SRCPORT, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc2_udp_dst,
|
|
{ "Destination port", "6lowpan.hc2.udp.dst",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_HC2_UDP_DSTPORT, NULL, HFILL }},
|
|
{ &hf_6lowpan_hc2_udp_len,
|
|
{ "Length", "6lowpan.hc2.udp.length",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_HC2_UDP_LENGTH, NULL, HFILL }},
|
|
|
|
/* IPHC header fields. */
|
|
{ &hf_6lowpan_iphc_flag_tf,
|
|
{ "Traffic class and flow label", "6lowpan.iphc.tf",
|
|
FT_UINT16, BASE_HEX, VALS(lowpan_iphc_traffic), LOWPAN_IPHC_FLAG_FLOW, "traffic class and flow control encoding", HFILL }},
|
|
{ &hf_6lowpan_iphc_flag_nhdr,
|
|
{ "Next header", "6lowpan.iphc.nh",
|
|
FT_BOOLEAN, 16, TFS(&lowpan_compression), LOWPAN_IPHC_FLAG_NHDR, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_flag_hlim,
|
|
{ "Hop limit", "6lowpan.iphc.hlim",
|
|
FT_UINT16, BASE_HEX, VALS(lowpan_iphc_hop_limit), LOWPAN_IPHC_FLAG_HLIM, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_flag_cid,
|
|
{ "Context identifier extension", "6lowpan.iphc.cid",
|
|
FT_BOOLEAN, 16, NULL, LOWPAN_IPHC_FLAG_CONTEXT_ID, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_flag_sac,
|
|
{ "Source address compression", "6lowpan.iphc.sac",
|
|
FT_BOOLEAN, 16, TFS(&lowpan_iphc_addr_compression), LOWPAN_IPHC_FLAG_SRC_COMP, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_flag_sam,
|
|
{ "Source address mode", "6lowpan.iphc.sam",
|
|
FT_UINT16, BASE_HEX, VALS(lowpan_iphc_addr_modes), LOWPAN_IPHC_FLAG_SRC_MODE, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_flag_mcast,
|
|
{ "Multicast address compression", "6lowpan.iphc.m",
|
|
FT_BOOLEAN, 16, NULL, LOWPAN_IPHC_FLAG_MCAST_COMP, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_flag_dac,
|
|
{ "Destination address compression","6lowpan.iphc.dac",
|
|
FT_BOOLEAN, 16, TFS(&lowpan_iphc_addr_compression), LOWPAN_IPHC_FLAG_DST_COMP, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_flag_dam,
|
|
{ "Destination address mode", "6lowpan.iphc.dam",
|
|
FT_UINT16, BASE_HEX, VALS(lowpan_iphc_addr_modes), LOWPAN_IPHC_FLAG_DST_MODE, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_sci,
|
|
{ "Source context identifier", "6lowpan.iphc.sci",
|
|
FT_UINT8, BASE_HEX, NULL, LOWPAN_IPHC_FLAG_SCI, NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_dci,
|
|
{ "Destination context identifier", "6lowpan.iphc.dci",
|
|
FT_UINT8, BASE_HEX, NULL, LOWPAN_IPHC_FLAG_DCI, NULL, HFILL }},
|
|
|
|
/* Context information fields. */
|
|
{ &hf_6lowpan_iphc_sctx_prefix,
|
|
{ "Source context", "6lowpan.iphc.sctx.prefix", FT_IPv6, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_sctx_origin,
|
|
{ "Origin", "6lowpan.iphc.sctx.origin", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_dctx_prefix,
|
|
{ "Destination context", "6lowpan.iphc.dctx.prefix", FT_IPv6, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_6lowpan_iphc_dctx_origin,
|
|
{ "Origin", "6lowpan.iphc.dctx.origin", FT_FRAMENUM, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
|
|
/* NHC IPv6 extension header fields. */
|
|
{ &hf_6lowpan_nhc_ext_eid,
|
|
{ "Header ID", "6lowpan.nhc.ext.eid",
|
|
FT_UINT8, BASE_HEX, VALS(lowpan_nhc_eid), LOWPAN_NHC_EXT_EID, NULL, HFILL }},
|
|
{ &hf_6lowpan_nhc_ext_nh,
|
|
{ "Next header", "6lowpan.nhc.ext.nh",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_NHC_EXT_NHDR, NULL, HFILL }},
|
|
{ &hf_6lowpan_nhc_ext_next,
|
|
{ "Next header", "6lowpan.nhc.ext.next",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_nhc_ext_length,
|
|
{ "Header length", "6lowpan.nhc.ext.length",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_nhc_ext_reserved,
|
|
{ "Reserved octet", "6lowpan.nhc.ext.reserved",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
|
|
/* NHC UDP header fields. */
|
|
{ &hf_6lowpan_nhc_udp_checksum,
|
|
{ "Checksum", "6lowpan.nhc.udp.checksum",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_NHC_UDP_CHECKSUM, NULL, HFILL }},
|
|
{ &hf_6lowpan_nhc_udp_src,
|
|
{ "Source port", "6lowpan.nhc.udp.src",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_NHC_UDP_SRCPORT, NULL, HFILL }},
|
|
{ &hf_6lowpan_nhc_udp_dst,
|
|
{ "Destination port", "6lowpan.nhc.udp.dst",
|
|
FT_BOOLEAN, 8, TFS(&lowpan_compression), LOWPAN_NHC_UDP_DSTPORT, NULL, HFILL }},
|
|
|
|
/* Uncompressed IPv6 fields. */
|
|
{ &hf_6lowpan_traffic_class,
|
|
{ "Traffic class", "6lowpan.class",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_flow_label,
|
|
{ "Flow label", "6lowpan.flow",
|
|
FT_UINT24, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_ecn,
|
|
{ "ECN", "6lowpan.ecn",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_dscp,
|
|
{ "DSCP", "6lowpan.dscp",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_next_header,
|
|
{ "Next header", "6lowpan.next",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_hop_limit,
|
|
{ "Hop limit", "6lowpan.hops",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_source,
|
|
{ "Source", "6lowpan.src",
|
|
FT_IPv6, BASE_NONE, NULL, 0x0, "Source IPv6 address", HFILL }},
|
|
{ &hf_6lowpan_dest,
|
|
{ "Destination", "6lowpan.dst",
|
|
FT_IPv6, BASE_NONE, NULL, 0x0, "Destination IPv6 address", HFILL }},
|
|
|
|
/* Uncompressed UDP fields. */
|
|
{ &hf_6lowpan_udp_src,
|
|
{ "Source port", "6lowpan.udp.src",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_udp_dst,
|
|
{ "Destination port", "6lowpan.udp.dst",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_udp_len,
|
|
{ "UDP length", "6lowpan.udp.length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_udp_checksum,
|
|
{ "UDP checksum", "6lowpan.udp.checksum",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
|
|
/* Broadcast header fields. */
|
|
{ &hf_6lowpan_bcast_seqnum,
|
|
{ "Sequence number", "6lowpan.bcast.seqnum",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
/* Mesh header fields. */
|
|
{ &hf_6lowpan_mesh_v,
|
|
{ "V", "6lowpan.mesh.v",
|
|
FT_BOOLEAN, 8, NULL, LOWPAN_MESH_HEADER_V, "short originator address present", HFILL }},
|
|
{ &hf_6lowpan_mesh_f,
|
|
{ "D", "6lowpan.mesh.f",
|
|
FT_BOOLEAN, 8, NULL, LOWPAN_MESH_HEADER_F, "short destination address present", HFILL }},
|
|
{ &hf_6lowpan_mesh_hops,
|
|
{ "Hops left", "6lowpan.mesh.hops",
|
|
FT_UINT8, BASE_DEC, NULL, LOWPAN_MESH_HEADER_HOPS, NULL, HFILL }},
|
|
{ &hf_6lowpan_mesh_hops8,
|
|
{ "Deep Hops left (Flags.Hops left == 15)", "6lowpan.mesh.hops8",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_mesh_orig16,
|
|
{ "Originator", "6lowpan.mesh.orig16",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_mesh_orig64,
|
|
{ "Originator", "6lowpan.mesh.orig64",
|
|
FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_mesh_dest16,
|
|
{ "Destination", "6lowpan.mesh.dest16",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_mesh_dest64,
|
|
{ "Destination", "6lowpan.mesh.dest64",
|
|
FT_UINT64, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
|
|
/* Fragmentation header fields. */
|
|
{ &hf_6lowpan_frag_dgram_size,
|
|
{ "Datagram size", "6lowpan.frag.size",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_frag_dgram_tag,
|
|
{ "Datagram tag", "6lowpan.frag.tag",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_6lowpan_frag_dgram_offset,
|
|
{ "Datagram offset", "6lowpan.frag.offset",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
/* Reassembly fields. */
|
|
{ &hf_6lowpan_fragments,
|
|
{ "Message fragments", "6lowpan.fragments",
|
|
FT_NONE, BASE_NONE, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_fragment,
|
|
{ "Message fragment", "6lowpan.fragment",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_fragment_overlap,
|
|
{ "Message fragment overlap", "6lowpan.fragment.overlap",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_fragment_overlap_conflicts,
|
|
{ "Message fragment overlapping with conflicting data", "6lowpan.fragment.overlap.conflicts",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_fragment_multiple_tails,
|
|
{ "Message has multiple tail fragments", "6lowpan.fragment.multiple_tails",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_fragment_too_long_fragment,
|
|
{ "Message fragment too long", "6lowpan.fragment.too_long_fragment",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_fragment_error,
|
|
{ "Message defragmentation error", "6lowpan.fragment.error",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_fragment_count,
|
|
{ "Message fragment count", "6lowpan.fragment.count",
|
|
FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_reassembled_in,
|
|
{ "Reassembled in", "6lowpan.reassembled.in",
|
|
FT_FRAMENUM, BASE_NONE, NULL, 0x00, NULL, HFILL }},
|
|
{ &hf_6lowpan_reassembled_length,
|
|
{ "Reassembled 6LoWPAN length", "6lowpan.reassembled.length",
|
|
FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL }}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_6lowpan,
|
|
&ett_6lowpan_hc1,
|
|
&ett_6lowpan_hc1_encoding,
|
|
&ett_6lowpan_hc2_udp,
|
|
&ett_6lowpan_iphc,
|
|
&ett_6lowpan_nhc_ext,
|
|
&ett_6lowpan_nhc_udp,
|
|
&ett_6lowpan_bcast,
|
|
&ett_6lowpan_mesh,
|
|
&ett_6lowpan_mesh_flags,
|
|
&ett_6lowpan_frag,
|
|
/* Reassembly subtrees. */
|
|
&ett_6lowpan_fragment,
|
|
&ett_6lowpan_fragments
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_6lowpan_hc1_more_bits, { "6lowpan.hc1_more_bits", PI_MALFORMED, PI_ERROR, "HC1 more bits expected for illegal next header type.", EXPFILL }},
|
|
{ &ei_6lowpan_illegal_dest_addr_mode, { "6lowpan.illegal_dest_addr_mode", PI_MALFORMED, PI_ERROR, "Illegal destination address mode", EXPFILL }},
|
|
{ &ei_6lowpan_bad_ipv6_header_length, { "6lowpan.bad_ipv6_header_length", PI_MALFORMED, PI_ERROR, "Length is less than IPv6 header length", EXPFILL }},
|
|
{ &ei_6lowpan_bad_ext_header_length, { "6lowpan.bad_ext_header_length", PI_MALFORMED, PI_ERROR, "Extension header not 8-octet aligned", EXPFILL }},
|
|
};
|
|
|
|
int i;
|
|
module_t *prefs_module;
|
|
expert_module_t* expert_6lowpan;
|
|
|
|
lowpan_context_table = g_hash_table_new_full(lowpan_context_hash, lowpan_context_equal, lowpan_context_free, lowpan_context_free);
|
|
|
|
proto_6lowpan = proto_register_protocol("IPv6 over IEEE 802.15.4", "6LoWPAN", "6lowpan");
|
|
proto_register_field_array(proto_6lowpan, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_6lowpan = expert_register_protocol(proto_6lowpan);
|
|
expert_register_field_array(expert_6lowpan, ei, array_length(ei));
|
|
|
|
/* Register the dissector with wireshark. */
|
|
handle_6lowpan = register_dissector("6lowpan", dissect_6lowpan, proto_6lowpan);
|
|
|
|
/* Register the dissector init function */
|
|
register_init_routine(proto_init_6lowpan);
|
|
register_cleanup_routine(proto_cleanup_6lowpan);
|
|
|
|
/* Initialize the context preferences. */
|
|
memset((gchar*)lowpan_context_prefs, 0, sizeof(lowpan_context_prefs));
|
|
|
|
/* Register preferences. */
|
|
prefs_module = prefs_register_protocol(proto_6lowpan, prefs_6lowpan_apply);
|
|
|
|
prefs_register_bool_preference(prefs_module, "rfc4944_short_address_format",
|
|
"Derive IID according to RFC 4944",
|
|
"Derive IID from a short 16-bit address according to RFC 4944 (using the PAN ID).",
|
|
&rfc4944_short_address_format);
|
|
|
|
for (i = 0; i < LOWPAN_CONTEXT_MAX; i++) {
|
|
char *pref_name, *pref_title;
|
|
|
|
/*
|
|
* Inspired by the IEEE 802.11 dissector - the preferences are expecting
|
|
* that each pref has a unique string passed in, and will crash if we
|
|
* try to reuse any for multiple preferences.
|
|
*/
|
|
pref_name = wmem_strdup_printf(wmem_epan_scope(), "context%d", i);
|
|
pref_title = wmem_strdup_printf(wmem_epan_scope(), "Context %d", i);
|
|
prefs_register_string_preference(prefs_module, pref_name, pref_title,
|
|
"IPv6 prefix to use for stateful address decompression.",
|
|
&lowpan_context_prefs[i]);
|
|
}
|
|
} /* proto_register_6lowpan */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* proto_init_6lowpan
|
|
* DESCRIPTION
|
|
* 6LoWPAN initialization function.
|
|
* PARAMETERS
|
|
* none ;
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
static void
|
|
proto_init_6lowpan(void)
|
|
{
|
|
/* Initialize the fragment reassembly table. */
|
|
reassembly_table_init(&lowpan_reassembly_table,
|
|
&addresses_reassembly_table_functions);
|
|
|
|
/* Initialize the link-local context. */
|
|
lowpan_context_local.frame = 0;
|
|
lowpan_context_local.plen = LOWPAN_CONTEXT_LINK_LOCAL_BITS;
|
|
memcpy(&lowpan_context_local.prefix, lowpan_llprefix, sizeof(lowpan_llprefix));
|
|
|
|
/* Reload static contexts from our preferences. */
|
|
prefs_6lowpan_apply();
|
|
} /* proto_init_6lowpan */
|
|
|
|
static void
|
|
proto_cleanup_6lowpan(void)
|
|
{
|
|
reassembly_table_destroy(&lowpan_reassembly_table);
|
|
}
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* prefs_6lowpan_apply
|
|
* DESCRIPTION
|
|
* Prefs "apply" callback. Parses the context table for
|
|
* IPv6 addresses/prefixes.
|
|
* PARAMETERS
|
|
* none ;
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
void
|
|
prefs_6lowpan_apply(void)
|
|
{
|
|
int i;
|
|
struct e_in6_addr prefix;
|
|
gchar *prefix_str;
|
|
gchar *prefix_len_str;
|
|
guint32 prefix_len;
|
|
gchar prefix_buf[48]; /* max length of IPv6 str. plus a bit */
|
|
|
|
for (i = 0; i < LOWPAN_CONTEXT_MAX; i++) {
|
|
if (!lowpan_context_prefs[i]) continue;
|
|
g_strlcpy(prefix_buf, lowpan_context_prefs[i], 48);
|
|
if ((prefix_str = strtok(prefix_buf, "/")) == NULL) continue;
|
|
if ((prefix_len_str = strtok(NULL, "/")) == NULL) continue;
|
|
if (sscanf(prefix_len_str, "%u", &prefix_len) != 1) continue;
|
|
if (!str_to_ip6(prefix_str, &prefix)) continue;
|
|
/* Set the prefix */
|
|
lowpan_context_insert(i, IEEE802154_BCAST_PAN, prefix_len, &prefix, 0);
|
|
} /* for */
|
|
} /* prefs_6lowpan_apply */
|
|
|
|
/*FUNCTION:------------------------------------------------------
|
|
* NAME
|
|
* proto_reg_handoff_6lowpan
|
|
* DESCRIPTION
|
|
* Protocol handoff routine for 6LoWPAN. Called after all
|
|
* protocols have been loaded.
|
|
* PARAMETERS
|
|
* none ;
|
|
* RETURNS
|
|
* void ;
|
|
*---------------------------------------------------------------
|
|
*/
|
|
void
|
|
proto_reg_handoff_6lowpan(void)
|
|
{
|
|
ipv6_handle = find_dissector_add_dependency("ipv6", proto_6lowpan);
|
|
|
|
/* Register the 6LoWPAN dissector with IEEE 802.15.4 */
|
|
dissector_add_for_decode_as(IEEE802154_PROTOABBREV_WPAN_PANID, handle_6lowpan);
|
|
heur_dissector_add(IEEE802154_PROTOABBREV_WPAN, dissect_6lowpan_heur, "6LoWPAN over IEEE 802.15.4", "6lowpan_wlan", proto_6lowpan, HEURISTIC_ENABLE);
|
|
|
|
dissector_add_uint("btl2cap.psm", BTL2CAP_PSM_LE_IPSP, handle_6lowpan);
|
|
dissector_add_for_decode_as("btl2cap.cid", handle_6lowpan);
|
|
} /* proto_reg_handoff_6lowpan */
|
|
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|