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wireshark/epan/dissectors/packet-btmesh.c

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/* packet-btmesh.c
* Routines for Bluetooth mesh dissection
*
* Copyright 2017, Anders Broman <anders.broman@ericsson.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* Ref: Mesh Profile v1.0
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/prefs.h>
#include <wsutil/ws_printf.h> /* ws_g_warning */
#include <wsutil/wsgcrypt.h>
#include <epan/expert.h>
#include <stdio.h>
#include <epan/uat.h>
void proto_register_btmesh(void);
gint net_mic_size_chosen = 1;
static int proto_btmesh = -1;
/*-------------------------------------
* UAT for BT Mesh
*-------------------------------------
*/
static uat_t * btmesh_uat = NULL;
static guint num_btmesh_uat = 0;
/* UAT entry structure. */
typedef struct {
gchar *network_key_string;
guint8 *network_key;
gint network_key_length;
gchar *ivindex_string;
gint ivindex_string_length;
guint8 *ivindex;
guint8 *privacykey;
guint8 *encryptionkey;
guint8 nid;
} uat_btmesh_record_t;
static uat_btmesh_record_t *uat_btmesh_records = NULL;
static int hf_btmesh_ivi = -1;
static int hf_btmesh_nid = -1;
static int hf_btmesh_obfuscated = -1;
static int hf_btmesh_encrypted = -1;
static int hf_btmesh_netmic = -1;
static int hf_btmesh_ctl = -1;
static int hf_btmesh_ttl = -1;
static int hf_btmesh_seq = -1;
static int hf_btmesh_src = -1;
static int hf_btmesh_dst = -1;
static int hf_btmesh_transp_pdu = -1;
static int hf_btmesh_cntr_seg = -1;
static int hf_btmesh_acc_seg = -1;
static int hf_btmesh_cntr_opcode = -1;
static int hf_btmesh_acc_akf = -1;
static int hf_btmesh_acc_aid = -1;
static int hf_btmesh_obo = -1;
static int hf_btmesh_seqzero = -1;
static int hf_btmesh_rfu = -1;
static int hf_btmesh_blockack = -1;
static int hf_btmesh_criteria_rfu = -1;
static int hf_btmesh_padding = -1;
static int hf_btmesh_fsn = -1;
static int hf_btmesh_criteria_rssifactor = -1;
static int hf_btmesh_criteria_receivewindowfactor = -1;
static int hf_btmesh_criteria_minqueuesizelog = -1;
static int hf_btmesh_receivedelay = -1;
static int hf_btmesh_polltimeout = -1;
static int hf_btmesh_previousaddress = -1;
static int hf_btmesh_numelements = -1;
static int hf_btmesh_lpncounter = -1;
static int hf_btmesh_receivewindow = -1;
static int hf_btmesh_queuesize = -1;
static int hf_btmesh_subscriptionlistsize = -1;
static int hf_btmesh_rssi = -1;
static int hf_btmesh_friendcounter = -1;
static int hf_btmesh_lpnaddress = -1;
static int hf_btmesh_transactionnumber = -1;
static int hf_btmesh_enc_access_pld = -1;
static int hf_btmesh_transtmic = -1;
static int hf_btmesh_szmic = -1;
static int hf_btmesh_seqzero_data = -1;
static int hf_btmesh_sego = -1;
static int hf_btmesh_segn = -1;
static int hf_btmesh_segment = -1;
static int ett_btmesh = -1;
static int ett_btmesh_net_pdu = -1;
static int ett_btmesh_transp_pdu = -1;
static int ett_btmesh_transp_ctrl_msg = -1;
static int ett_btmesh_upper_transp_acc_pdu = -1;
static expert_field ei_btmesh_not_decoded_yet = EI_INIT;
static expert_field ei_btmesh_decrypt_failed = EI_INIT;
static const value_string btmesh_ctl_vals[] = {
{ 0, "Access Message" },
{ 1, "Control Message" },
{ 0, NULL }
};
static const value_string btmesh_ctrl_seg_vals[] = {
{ 0, "Unsegmented Control Message" },
{ 1, "Segmented Control Message" },
{ 0, NULL }
};
static const value_string btmesh_acc_seg_vals[] = {
{ 0, "Unsegmented Access Message" },
{ 1, "Segmented Access Message" },
{ 0, NULL }
};
static const value_string btmesh_acc_akf_vals[] = {
{ 0, "Device key" },
{ 1, "Application key" },
{ 0, NULL }
};
static const value_string btmesh_ctrl_opcode_vals[] = {
{ 0x0, "Segment Acknowledgment" }, /* Reserved for lower transport layer */
{ 0x1, "Friend Poll" },
{ 0x2, "Friend Update" },
{ 0x3, "Friend Request" },
{ 0x4, "Friend Offer" },
{ 0x5, "Friend Clear" },
{ 0x6, "Friend Clear Confirm" },
{ 0x7, "Friend Subscription List Add" },
{ 0x8, "Friend Subscription List Remove" },
{ 0x9, "Friend Subscription List Confirm" },
{ 0xa, "Heartbeat" },
{ 0, NULL }
};
static const true_false_string btmesh_obo = {
"Friend node that is acknowledging this message on behalf of a Low Power node",
"Node that is directly addressed by the received message"
};
static const value_string btmesh_criteria_rssifactor_vals[] = {
{ 0x0, "1" },
{ 0x1, "1.5" },
{ 0x2, "2" },
{ 0x3, "2.5" },
{ 0, NULL }
};
static const value_string btmesh_criteria_receivewindowfactor_vals[] = {
{ 0x0, "1" },
{ 0x1, "1.5" },
{ 0x2, "2" },
{ 0x3, "2.5" },
{ 0, NULL }
};
static const value_string btmesh_criteria_minqueuesizelog_vals[] = {
{ 0x0, "Prohibited" },
{ 0x1, "N = 2" },
{ 0x2, "N = 4" },
{ 0x3, "N = 8" },
{ 0x4, "N = 16" },
{ 0x5, "N = 32" },
{ 0x6, "N = 64" },
{ 0x7, "N = 128" },
{ 0, NULL }
};
static const value_string btmesh_szmic_vals[] = {
{ 0x0, "32-bit" },
{ 0x1, "64-bit" },
{ 0, NULL }
};
static gint
dissect_btmesh_msg_no_decrypt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_item *item;
proto_tree *sub_tree;
int offset = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BT Mesh");
col_clear(pinfo->cinfo, COL_INFO);
item = proto_tree_add_item(tree, proto_btmesh, tvb, offset, -1, ENC_NA);
sub_tree = proto_item_add_subtree(item, ett_btmesh);
/* First byte in plaintext */
/* IVI 1 bit Least significant bit of IV Index */
proto_tree_add_item(sub_tree, hf_btmesh_ivi, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sub_tree, hf_btmesh_nid, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
proto_tree_add_item(sub_tree, hf_btmesh_obfuscated, tvb, offset, 6, ENC_NA);
offset += 6;
proto_tree_add_item(sub_tree, hf_btmesh_encrypted, tvb, offset, -1, ENC_NA);
return tvb_reported_length(tvb);
}
/* A BT Mesh dissector is not realy useful without decryption as all packets are encrypted. Just leave a stub dissector outside of*/
#if GCRYPT_VERSION_NUMBER >= 0x010600 /* 1.6.0 */
/* BT Mesh s1 function */
static gboolean
s1(guint8 *m, size_t mlen, guint8 *salt)
{
gcry_mac_hd_t mac_hd;
int gcrypt_err;
size_t read_digest_length = 16;
guint8 zero[16] = { 0 };
/* Open gcrypt handle */
gcrypt_err = gcry_mac_open(&mac_hd, GCRY_MAC_CMAC_AES, 0, NULL);
if (gcrypt_err != 0) {
return FALSE;
}
/* Set the key */
gcrypt_err = gcry_mac_setkey(mac_hd, &zero, 16);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
gcrypt_err = gcry_mac_write(mac_hd, m, mlen);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return 0;
}
/* Read out the digest */
gcrypt_err = gcry_mac_read(mac_hd, salt, &read_digest_length);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return 0;
}
/* Now close the mac handle */
gcry_mac_close(mac_hd);
return TRUE;
}
/* BT Mesh K2 function
* Allow plen up to 9 char
*
* The key (T) is computed as follows:
* T = AES-CMACSALT (N)
* SALT is the 128-bit value computed as follows
* SALT = s1("smk2")
* The output of the key generation function k2 is as follows:
* T0 = empty string (zero length)
* T1 = AES-CMACT (T0 || P || 0x01)
* T2 = AES-CMACT (T1 || P || 0x02)
* T3 = AES-CMACT (T2 || P || 0x03)
* k2(N, P) = (T1 || T2 || T3) mod 2(pow)263
*/
static gboolean
k2(uat_btmesh_record_t * net_key_set, guint8 *p, size_t plen)
{
gcry_mac_hd_t mac_hd;
int gcrypt_err;
guint8 smk2[4] = { 's', 'm', 'k', '2' };
size_t mlen = 4;
guint8 salt[16];
guint8 t[16];
guint8 t1[16];
guint8 p_t1[9 + 1];
guint8 p_t2[16 + 9 + 1];
guint8 p_t3[16 + 9 + 1];
size_t read_digest_length = 16;
if (plen > 8) {
return FALSE;
}
/* SALT = s1("smk2") */
if (s1(smk2, mlen, salt) == FALSE) {
return FALSE;
}
/* T = AES-CMAC_SALT(N) */
/* Open gcrypt handle */
gcrypt_err = gcry_mac_open(&mac_hd, GCRY_MAC_CMAC_AES, 0, NULL);
if (gcrypt_err != 0) {
return FALSE;
}
/* Set the key */
gcrypt_err = gcry_mac_setkey(mac_hd, &salt, 16);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
gcrypt_err = gcry_mac_write(mac_hd, net_key_set->network_key, 16);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
/* Read out the digest */
gcrypt_err = gcry_mac_read(mac_hd, t, &read_digest_length);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
/* Now close the mac handle */
gcry_mac_close(mac_hd);
// T0 = empty string (zero length)
// T1 = AES-CMAC_T(T0 || P || 0x01)
memcpy(p_t1, p, plen);
p_t1[plen] = 0x01;
/* Open gcrypt handle */
gcrypt_err = gcry_mac_open(&mac_hd, GCRY_MAC_CMAC_AES, 0, NULL);
if (gcrypt_err != 0) {
return FALSE;
}
/* Set the key */
gcrypt_err = gcry_mac_setkey(mac_hd, &t, 16);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
gcrypt_err = gcry_mac_write(mac_hd, &p_t1, plen + 1);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
/* Read out the digest */
gcrypt_err = gcry_mac_read(mac_hd, t1, &read_digest_length);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
net_key_set->nid = (t1[15] & 0x7f);
/* T2 = AES-CMAC_T(T1 || P || 0x02)
* (EncryptionKey)
*/
memcpy(p_t2, t1, 16);
memcpy(&p_t2[16], p, plen);
p_t2[16 + plen] = 0x02;
/* Open gcrypt handle */
gcrypt_err = gcry_mac_open(&mac_hd, GCRY_MAC_CMAC_AES, 0, NULL);
if (gcrypt_err != 0) {
return FALSE;
}
/* Set the key */
gcrypt_err = gcry_mac_setkey(mac_hd, &t, 16);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
gcrypt_err = gcry_mac_write(mac_hd, &p_t2, 16 + plen + 1);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
/* Read out the digest */
gcrypt_err = gcry_mac_read(mac_hd, net_key_set->encryptionkey, &read_digest_length);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
/* T3 = AES-CMAC_T(T2 || P || 0x03) */
/* PrivacyKey */
memcpy(p_t3, net_key_set->encryptionkey, 16);
memcpy(&p_t3[16], p, plen);
p_t3[16 + plen] = 0x03;
/* Open gcrypt handle */
gcrypt_err = gcry_mac_open(&mac_hd, GCRY_MAC_CMAC_AES, 0, NULL);
if (gcrypt_err != 0) {
return FALSE;
}
/* Set the key */
gcrypt_err = gcry_mac_setkey(mac_hd, t, 16);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
gcrypt_err = gcry_mac_write(mac_hd, p_t3, 16 + plen + 1);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
/* Read out the digest */
gcrypt_err = gcry_mac_read(mac_hd, net_key_set->privacykey, &read_digest_length);
if (gcrypt_err != 0) {
gcry_mac_close(mac_hd);
return FALSE;
}
return TRUE;
}
static gboolean
create_master_security_keys(uat_btmesh_record_t * net_key_set)
{
guint8 p[1] = { 0 };
size_t plen = 1;
k2(net_key_set, p, plen);
return TRUE;
}
static tvbuff_t *
btmesh_deobfuscate(tvbuff_t *tvb, packet_info *pinfo, int offset _U_, uat_btmesh_record_t *net_key_set)
{
tvbuff_t *de_obf_tvb = NULL;
/* Decode ObfuscatedData
* Privacy Random = (EncDST || EncTransportPDU || NetMIC)[0-6]
* PECB = e ((PrivacyKey, 0x0000000000 || IV Index || Privacy Random)
* (CTL || TTL || SEQ || SRC) = ObfuscatedData
*/
guint8 in[16]; /* 0x0000000000 || IV Index || Privacy Random */
gcry_cipher_hd_t cipher_hd;
guint8 pecb[16];
guint8 *plaintextnetworkheader = (guint8 *)wmem_alloc(pinfo->pool, 6);
int i;
memset(in, 0x00, 5);
in[5] = net_key_set->ivindex[0];
in[6] = net_key_set->ivindex[1];
in[7] = net_key_set->ivindex[2];
in[8] = net_key_set->ivindex[3];
/* Privacy random */
tvb_memcpy(tvb, (guint8 *)&in+9, 7, 7);
if (gcry_cipher_open(&cipher_hd, GCRY_CIPHER_AES128, GCRY_CIPHER_MODE_ECB, 0)) {
return NULL;
}
if (gcry_cipher_setkey(cipher_hd, net_key_set->privacykey, 16)) {
gcry_cipher_close(cipher_hd);
return NULL;
}
/* Decrypt */
if (gcry_cipher_encrypt(cipher_hd, &pecb, 16, &in, 16)) {
gcry_cipher_close(cipher_hd);
return NULL;
}
/* Now close the mac handle */
gcry_cipher_close(cipher_hd);
for ( i = 0; i<6; i++) {
plaintextnetworkheader[i] = tvb_get_guint8(tvb,i+1) ^ pecb[i];
}
de_obf_tvb = tvb_new_child_real_data(tvb, plaintextnetworkheader, 6, 6);
add_new_data_source(pinfo, de_obf_tvb, "Deobfuscated data");
return de_obf_tvb;
}
static void
dissect_btmesh_transport_constrol_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint32 opcode)
{
proto_tree *sub_tree;
sub_tree = proto_tree_add_subtree_format(tree, tvb, offset, -1, ett_btmesh_transp_ctrl_msg, NULL, "Transport Control Message %s",
val_to_str_const(opcode, btmesh_ctrl_opcode_vals, "Unknown"));
switch (opcode) {
case 1:
/* 3.6.5.1 Friend Poll */
/* Padding 7 bits */
proto_tree_add_item(sub_tree, hf_btmesh_padding, tvb, offset, 1, ENC_BIG_ENDIAN);
/* FSN 1 bit*/
proto_tree_add_item(sub_tree, hf_btmesh_fsn, tvb, offset, 1, ENC_BIG_ENDIAN);
break;
case 2:
/* 3.6.5.2 Friend Update */
/* Flags 1 octet */
/* IV Index 4 octets*/
/* MD 1 octet */
proto_tree_add_expert(sub_tree, pinfo, &ei_btmesh_not_decoded_yet, tvb, offset, -1);
break;
case 3:
/* Friend Request */
/* Criteria 1 octet */
/* RFU 1 bit */
proto_tree_add_item(sub_tree, hf_btmesh_criteria_rfu, tvb, offset, 1, ENC_BIG_ENDIAN);
/* RSSIFactor 2 bits */
proto_tree_add_item(sub_tree, hf_btmesh_criteria_rssifactor, tvb, offset, 1, ENC_BIG_ENDIAN);
/* ReceiveWindowFactor 2 bits */
proto_tree_add_item(sub_tree, hf_btmesh_criteria_receivewindowfactor, tvb, offset, 1, ENC_BIG_ENDIAN);
/* MinQueueSizeLog 3 bits */
proto_tree_add_item(sub_tree, hf_btmesh_criteria_minqueuesizelog, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* ReceiveDelay 1 octet */
proto_tree_add_item(sub_tree, hf_btmesh_receivedelay, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* PollTimeout 3 octets */
proto_tree_add_item(sub_tree, hf_btmesh_polltimeout, tvb, offset, 3, ENC_BIG_ENDIAN);
offset+=3;
/* PreviousAddress 2 octets */
proto_tree_add_item(sub_tree, hf_btmesh_previousaddress, tvb, offset, 2, ENC_BIG_ENDIAN);
offset+=2;
/* NumElements 1 octets */
proto_tree_add_item(sub_tree, hf_btmesh_numelements, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* LPNCounter 1 octets */
proto_tree_add_item(sub_tree, hf_btmesh_lpncounter, tvb, offset, 1, ENC_BIG_ENDIAN);
break;
case 4:
/* 3.6.5.4 Friend Offer */
/* ReceiveWindow 1 octet */
proto_tree_add_item(sub_tree, hf_btmesh_receivewindow, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* QueueSize 1 octet */
proto_tree_add_item(sub_tree, hf_btmesh_queuesize, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* SubscriptionListSize 1 octet */
proto_tree_add_item(sub_tree, hf_btmesh_subscriptionlistsize, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* RSSI 1 octet */
proto_tree_add_item(sub_tree, hf_btmesh_rssi, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* FriendCounter 2 octets */
proto_tree_add_item(sub_tree, hf_btmesh_friendcounter, tvb, offset, 1, ENC_BIG_ENDIAN);
break;
case 5:
/* 3.6.5.5 Friend Clear */
/* LPNAddress 2 octets */
proto_tree_add_item(sub_tree, hf_btmesh_lpnaddress, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 2;
/* LPNCounter 2 octets */
proto_tree_add_item(sub_tree, hf_btmesh_lpncounter, tvb, offset, 1, ENC_BIG_ENDIAN);
break;
case 6:
/* 3.6.5.6 Friend Clear Confirm */
/* LPNAddress 2 octets */
proto_tree_add_item(sub_tree, hf_btmesh_lpnaddress, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 2;
/* LPNCounter 2 octets */
proto_tree_add_item(sub_tree, hf_btmesh_lpncounter, tvb, offset, 1, ENC_BIG_ENDIAN);
break;
case 7:
/* 3.6.5.7 Friend Subscription List Add */
/* TransactionNumber 1 octet */
proto_tree_add_item(sub_tree, hf_btmesh_transactionnumber, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* AddressList 2 * N */
proto_tree_add_expert(sub_tree, pinfo, &ei_btmesh_not_decoded_yet, tvb, offset, -1);
break;
case 8:
/* 3.6.5.8 Friend Subscription List Remove */
proto_tree_add_item(sub_tree, hf_btmesh_transactionnumber, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
/* AddressList 2 * N */
proto_tree_add_expert(sub_tree, pinfo, &ei_btmesh_not_decoded_yet, tvb, offset, -1);
break;
case 9:
/* 3.6.5.9 Friend Subscription List Confirm */
proto_tree_add_item(sub_tree, hf_btmesh_transactionnumber, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
break;
case 10:
/* 3.6.5.10 Heartbeat */
default:
proto_tree_add_expert(sub_tree, pinfo, &ei_btmesh_not_decoded_yet, tvb, offset, -1);
break;
}
}
static void
dissect_btmesh_transport_access_message(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, int offset, int transmic_size)
{
proto_tree *sub_tree;
int length = tvb_reported_length_remaining(tvb, offset);
sub_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_btmesh_upper_transp_acc_pdu, NULL, "Upper Transport Access PDU");
proto_tree_add_item(sub_tree, hf_btmesh_enc_access_pld, tvb, offset, length - transmic_size, ENC_NA);
offset += (length - transmic_size);
proto_tree_add_item(sub_tree, hf_btmesh_transtmic, tvb, offset, transmic_size, ENC_BIG_ENDIAN);
}
static void
dissect_btmesh_transport_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gboolean cntrl)
{
proto_tree *sub_tree;
proto_item *ti;
int offset = 0;
guint32 value, opcode;
/* We receive the full decrypted buffer including DST, skip to opcode */
offset += 2;
sub_tree = proto_tree_add_subtree(tree, tvb, offset, -1, ett_btmesh_transp_pdu, &ti, "Lower Transport PDU");
if (cntrl) {
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_cntr_seg, tvb, offset, 1, ENC_BIG_ENDIAN, &value);
if (value) {
/* Segmented */
} else {
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_cntr_opcode, tvb, offset, 1, ENC_BIG_ENDIAN, &opcode);
offset++;
col_append_fstr(pinfo->cinfo, COL_INFO, "%s",
val_to_str_const(opcode, btmesh_ctrl_opcode_vals, "Unknown"));
if (opcode == 0) {
/* OBO 1 */
proto_tree_add_item(sub_tree, hf_btmesh_obo, tvb, offset, 2, ENC_BIG_ENDIAN);
/* SeqZero 13 */
proto_tree_add_item(sub_tree, hf_btmesh_seqzero, tvb, offset, 2, ENC_BIG_ENDIAN);
/* RFU 2 */
proto_tree_add_item(sub_tree, hf_btmesh_rfu, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* BlockAck 32 */
proto_tree_add_item(sub_tree, hf_btmesh_blockack, tvb, offset, 4, ENC_BIG_ENDIAN);
return;
}
dissect_btmesh_transport_constrol_message(tvb, pinfo, tree, offset, opcode);
}
} else {
/* Access message */
guint32 seg, afk, aid, szmic;
/* Access message */
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_acc_seg, tvb, offset, 1, ENC_BIG_ENDIAN, &seg);
/* AKF 1 Application Key Flag */
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_acc_akf, tvb, offset, 1, ENC_BIG_ENDIAN, &afk);
/* AID 6 Application key identifier */
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_acc_aid, tvb, offset, 1, ENC_BIG_ENDIAN, &aid);
offset++;
if (seg) {
/* Segmented */
/* SZMIC 1 Size of TransMIC */
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_szmic, tvb, offset, 3, ENC_BIG_ENDIAN, &szmic);
/* SeqZero 13 Least significant bits of SeqAuth */
proto_tree_add_item(sub_tree, hf_btmesh_seqzero_data, tvb, offset, 3, ENC_BIG_ENDIAN);
/* SegO 5 Segment Offset number */
proto_tree_add_item(sub_tree, hf_btmesh_sego, tvb, offset, 3, ENC_BIG_ENDIAN);
/* SegN 5 Last Segment number */
proto_tree_add_item(sub_tree, hf_btmesh_segn, tvb, offset, 3, ENC_BIG_ENDIAN);
offset += 3;
/* Segment m 8 to 96 Segment m of the Upper Transport Access PDU */
proto_tree_add_item(sub_tree, hf_btmesh_segment, tvb, offset, -1, ENC_NA);
} else {
proto_item_set_len(ti, 1);
dissect_btmesh_transport_access_message(tvb, pinfo, tree, offset, 4/*TransMic is 32 bits*/);
}
}
}
static gint
dissect_btmesh_msg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_item *item;
proto_tree *netw_tree, *sub_tree;
int offset = 0, enc_offset;
guint i;
guint8 nid;
gboolean found;
guint32 net_mic_size, seq, src;
int enc_data_len;
tvbuff_t *de_obf_tvb;
guint8 networknonce[13];
gcry_cipher_hd_t cipher_hd;
/*gcry_error_t cry_error;*/
gboolean cry_error;
guint64 ccm_lengths[3];
tvbuff_t *de_cry_tvb;
int decry_off;
guint8 *decrypted_data;
uat_btmesh_record_t *record;
nid = tvb_get_guint8(tvb, offset) & 0x7f;
found = FALSE;
/* Get the next record to try */
for (i = 0; i < num_btmesh_uat; i++) {
record = &uat_btmesh_records[i];
if (nid == record->nid) {
found = TRUE;
break;
}
}
if (!found) {
/* No matching UAT records found */
return dissect_btmesh_msg_no_decrypt(tvb, pinfo, tree, data);
}
col_set_str(pinfo->cinfo, COL_PROTOCOL, "BT Mesh");
col_clear(pinfo->cinfo, COL_INFO);
item = proto_tree_add_item(tree, proto_btmesh, tvb, offset, -1, ENC_NA);
netw_tree = proto_item_add_subtree(item, ett_btmesh);
sub_tree = proto_tree_add_subtree(netw_tree, tvb, offset, -1, ett_btmesh_net_pdu, NULL, "Network PDU");
/* Check lengt >= , if not error packet */
/* First byte in plaintext */
/* IVI 1 bit Least significant bit of IV Index */
proto_tree_add_item(sub_tree, hf_btmesh_ivi, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(sub_tree, hf_btmesh_nid, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
de_obf_tvb = btmesh_deobfuscate(tvb, pinfo, offset, record);
if (de_obf_tvb) {
gboolean cntrl;
/* Start setting network nounce.*/
networknonce[0] = 0; /* Nonce Type */
/* CTL 1 bit Network Control*/
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_ctl, de_obf_tvb, 0, 1, ENC_BIG_ENDIAN, &net_mic_size);
/* 32 or 64 bits ( 0 or 1 )*/
cntrl = net_mic_size;
net_mic_size = (net_mic_size + 1) * 4;
/* The TTL field is a 7-bit field */
proto_tree_add_item(sub_tree, hf_btmesh_ttl, de_obf_tvb, 0, 1, ENC_BIG_ENDIAN);
networknonce[1] = tvb_get_guint8(de_obf_tvb,0);/* CTL and TTL */
/* SEQ field is a 24-bit integer */
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_seq, de_obf_tvb, 1, 3, ENC_BIG_ENDIAN, &seq);
networknonce[2] = seq >> 16;
networknonce[3] = seq >> 8;
networknonce[4] = seq;
/* SRC field is a 16-bit value */
proto_tree_add_item_ret_uint(sub_tree, hf_btmesh_src, de_obf_tvb, 4, 2, ENC_BIG_ENDIAN, &src);
offset += 6;
networknonce[5] = src >> 8;
networknonce[6] = src;
networknonce[7] = 0x00; /*Pad*/
networknonce[8] = 0x00; /*Pad*/
networknonce[9] = record->ivindex[0];
networknonce[10] = record->ivindex[1];
networknonce[11] = record->ivindex[2];
networknonce[12] = record->ivindex[3];
enc_data_len = tvb_reported_length(tvb) - 1 - 6 - net_mic_size;
enc_offset = offset;
/* Decrypt packet EXPERIMENTAL CODE */
if (gcry_cipher_open(&cipher_hd, GCRY_CIPHER_AES128, GCRY_CIPHER_MODE_CCM, 0)) {
return offset;
}
cry_error = gcry_cipher_setkey(cipher_hd, record->encryptionkey, 16);
if (cry_error) {
ws_g_warning("gcry_cipher_setkey failed\n");
gcry_cipher_close(cipher_hd);
return offset;
}
/* Load nonce */
cry_error = gcry_cipher_setiv(cipher_hd, &networknonce, 13);
if (cry_error) {
ws_g_warning("gcry_cipher_setiv failed\n");
gcry_cipher_close(cipher_hd);
return offset;
}
/* */
ccm_lengths[0] = enc_data_len;
ccm_lengths[1] = 0; /* aad */
ccm_lengths[2] = net_mic_size; /* icv NOT SURE ABOUT THIS ONE */
cry_error = gcry_cipher_ctl(cipher_hd, GCRYCTL_SET_CCM_LENGTHS, ccm_lengths, sizeof(ccm_lengths));
if (cry_error) {
ws_g_warning("gcry_cipher_ctl failed %s enc_data_len %u\n",
gcry_strerror(cry_error),
enc_data_len);
gcry_cipher_close(cipher_hd);
return offset;
}
decrypted_data = (guint8 *)wmem_alloc(pinfo->pool, enc_data_len);
/* Decrypt */
cry_error = gcry_cipher_decrypt(cipher_hd, decrypted_data, enc_data_len, tvb_get_ptr(tvb, enc_offset, enc_data_len), enc_data_len);
if (cry_error) {
expert_add_info(pinfo, item, &ei_btmesh_decrypt_failed);
ws_g_warning("gcry_cipher_decrypt failed %s\n", gcry_strerror(cry_error));
gcry_cipher_close(cipher_hd);
return offset;
}
/* Now close the cypher handle */
gcry_cipher_close(cipher_hd);
de_cry_tvb = tvb_new_child_real_data(tvb, decrypted_data, enc_data_len, enc_data_len);
add_new_data_source(pinfo, de_cry_tvb, "Decrypted data");
decry_off = 0;
proto_tree_add_item(sub_tree, hf_btmesh_dst, de_cry_tvb, decry_off, 2, ENC_BIG_ENDIAN);
decry_off += 2;
/* TransportPDU */
proto_tree_add_item(sub_tree, hf_btmesh_transp_pdu, de_cry_tvb, decry_off, enc_data_len-2, ENC_NA);
offset += enc_data_len;
proto_tree_add_item(sub_tree, hf_btmesh_netmic, tvb, offset, net_mic_size, ENC_BIG_ENDIAN);
offset += net_mic_size;
if (de_cry_tvb) {
dissect_btmesh_transport_pdu(de_cry_tvb, pinfo, netw_tree, cntrl);
}
} else {
proto_tree_add_item(sub_tree, hf_btmesh_obfuscated, tvb, offset, 6, ENC_NA);
offset += 6;
proto_tree_add_item(sub_tree, hf_btmesh_encrypted, tvb, offset, -1, ENC_NA);
offset = tvb_reported_length(tvb);
}
return offset;
}
#else /* GCRYPT_VERSION_NUMBER >= 0x010600 */
static gboolean
create_master_security_keys(uat_btmesh_record_t * net_key_set _U_)
{
return TRUE;
}
/* Stub dissector if decryption not available on build system */
static gint
dissect_btmesh_msg(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
return dissect_btmesh_msg_no_decrypt(tvb, pinfo, tree, data);
}
#endif /* GCRYPT_VERSION_NUMBER >= 0x010600 */
static gint
compute_ascii_key(guchar **ascii_key, const gchar *key)
{
guint key_len = 0, raw_key_len;
gint hex_digit;
guchar key_byte;
guint i, j;
if (key != NULL)
{
raw_key_len = (guint)strlen(key);
if ((raw_key_len > 2) && (key[0] == '0') && ((key[1] == 'x') || (key[1] == 'X')))
{
/*
* Key begins with "0x" or "0X"; skip that and treat the rest
* as a sequence of hex digits.
*/
i = 2; /* first character after "0[Xx]" */
j = 0;
if (raw_key_len % 2 == 1)
{
/*
* Key has an odd number of characters; we act as if the
* first character had a 0 in front of it, making the
* number of characters even.
*/
key_len = (raw_key_len - 2) / 2 + 1;
*ascii_key = (gchar *)g_malloc((key_len + 1) * sizeof(gchar));
hex_digit = g_ascii_xdigit_value(key[i]);
i++;
if (hex_digit == -1)
{
g_free(*ascii_key);
*ascii_key = NULL;
return -1; /* not a valid hex digit */
}
(*ascii_key)[j] = (guchar)hex_digit;
j++;
}
else
{
/*
* Key has an even number of characters, so we treat each
* pair of hex digits as a single byte value.
*/
key_len = (raw_key_len - 2) / 2;
*ascii_key = (gchar *)g_malloc((key_len + 1) * sizeof(gchar));
}
while (i < (raw_key_len - 1))
{
hex_digit = g_ascii_xdigit_value(key[i]);
i++;
if (hex_digit == -1)
{
g_free(*ascii_key);
*ascii_key = NULL;
return -1; /* not a valid hex digit */
}
key_byte = ((guchar)hex_digit) << 4;
hex_digit = g_ascii_xdigit_value(key[i]);
i++;
if (hex_digit == -1)
{
g_free(*ascii_key);
*ascii_key = NULL;
return -1; /* not a valid hex digit */
}
key_byte |= (guchar)hex_digit;
(*ascii_key)[j] = key_byte;
j++;
}
(*ascii_key)[j] = '\0';
}
else if ((raw_key_len == 2) && (key[0] == '0') && ((key[1] == 'x') || (key[1] == 'X')))
{
return 0;
}
else
{
key_len = raw_key_len;
*ascii_key = g_strdup(key);
}
}
return key_len;
}
static gboolean
uat_btmesh_record_update_cb(void *r, char **err _U_)
{
uat_btmesh_record_t *rec = (uat_btmesh_record_t *)r;
/* Compute keys & lengths once and for all */
if (rec->network_key_string) {
rec->network_key_length = compute_ascii_key(&rec->network_key, rec->network_key_string);
rec->encryptionkey = (guint8 *)g_malloc(16 * sizeof(guint8));
rec->privacykey = (guint8 *)g_malloc(16 * sizeof(guint8));
create_master_security_keys(rec);
}
else {
rec->network_key_length = 0;
rec->network_key = NULL;
}
if (rec->ivindex_string) {
rec-> ivindex_string_length = compute_ascii_key(&rec->ivindex, rec->ivindex_string);
}
return TRUE;
}
static void *
uat_btmesh_record_copy_cb(void *n, const void *o, size_t siz _U_)
{
uat_btmesh_record_t *new_rec = (uat_btmesh_record_t *)n;
const uat_btmesh_record_t* old_rec = (const uat_btmesh_record_t *)o;
/* Copy UAT fields */
new_rec->network_key_string = g_strdup(old_rec->network_key_string);
new_rec->ivindex_string = g_strdup(old_rec->ivindex_string);
/* Parse keys as in an update */
uat_btmesh_record_update_cb(new_rec, NULL);
return new_rec;
}
static void
uat_btmesh_record_free_cb(void *r)
{
uat_btmesh_record_t *rec = (uat_btmesh_record_t *)r;
g_free(rec->network_key_string);
g_free(rec->network_key);
}
UAT_CSTRING_CB_DEF(uat_btmesh_records, network_key_string, uat_btmesh_record_t)
UAT_CSTRING_CB_DEF(uat_btmesh_records, ivindex_string, uat_btmesh_record_t)
void
proto_register_btmesh(void)
{
static hf_register_info hf[] = {
{ &hf_btmesh_ivi,
{ "IVI", "btmesh.ivi",
FT_UINT8, BASE_DEC, NULL, 0x80,
NULL, HFILL }
},
{ &hf_btmesh_nid,
{ "NID", "btmesh.nid",
FT_UINT8, BASE_DEC, NULL, 0x7f,
NULL, HFILL }
},
{ &hf_btmesh_obfuscated,
{ "Obfuscated", "btmesh.obfuscated",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_encrypted,
{ "Encrypted data and NetMIC", "btmesh.encrypted",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_netmic,
{ "NetMIC", "btmesh.netmic",
FT_UINT64, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_ctl,
{ "CTL", "btmesh.ctl",
FT_UINT8, BASE_DEC, VALS(btmesh_ctl_vals), 0x80,
NULL, HFILL }
},
{ &hf_btmesh_ttl,
{ "TTL", "btmesh.ttl",
FT_UINT8, BASE_DEC, NULL, 0x7f,
NULL, HFILL }
},
{ &hf_btmesh_seq,
{ "SEQ", "btmesh.seq",
FT_UINT24, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_src,
{ "SRC", "btmesh.src",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_dst,
{ "DST", "btmesh.dst",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_transp_pdu,
{ "TransportPDU", "btmesh.transp_pdu",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_cntr_seg,
{ "SEG", "btmesh.cntr.seg",
FT_UINT8, BASE_DEC, VALS(btmesh_ctrl_seg_vals), 0x80,
NULL, HFILL }
},
{ &hf_btmesh_acc_seg,
{ "SEG", "btmesh.acc.seg",
FT_UINT8, BASE_DEC, VALS(btmesh_acc_seg_vals), 0x80,
NULL, HFILL }
},
{ &hf_btmesh_cntr_opcode,
{ "Opcode", "btmesh.cntr.opcode",
FT_UINT8, BASE_DEC, VALS(btmesh_ctrl_opcode_vals), 0x7f,
NULL, HFILL }
},
{ &hf_btmesh_acc_akf,
{ "AKF", "btmesh.acc.akf",
FT_UINT8, BASE_DEC, VALS(btmesh_acc_akf_vals), 0x40,
NULL, HFILL }
},
{ &hf_btmesh_acc_aid,
{ "AID", "btmesh.acc.aid",
FT_UINT8, BASE_DEC, NULL, 0x3f,
NULL, HFILL }
},
{ &hf_btmesh_obo,
{ "OBO", "btmesh.obo",
FT_BOOLEAN, 16, TFS(&btmesh_obo), 0x8000,
NULL, HFILL }
},
{ &hf_btmesh_seqzero,
{ "SeqZero", "btmesh.seqzero",
FT_UINT16, BASE_DEC, NULL, 0x7ffc,
NULL, HFILL }
},
{ &hf_btmesh_rfu,
{ "Reserved for Future Use", "btmesh.rfu",
FT_UINT16, BASE_DEC, NULL, 0x0003,
NULL, HFILL }
},
{ &hf_btmesh_blockack,
{ "BlockAck", "btmesh.blockack",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_criteria_rfu,
{ "RFU", "btmesh.criteria.rfu",
FT_UINT8, BASE_DEC, NULL, 0x80,
NULL, HFILL }
},
{ &hf_btmesh_padding,
{ "Padding", "btmesh.padding",
FT_UINT8, BASE_DEC, NULL, 0xfe,
NULL, HFILL }
},
{ &hf_btmesh_fsn,
{ "Friend Sequence Number(FSN)", "btmesh.fsn",
FT_UINT8, BASE_DEC, NULL, 0x01,
NULL, HFILL }
},
{ &hf_btmesh_criteria_rssifactor,
{ "RSSIFactor", "btmesh.criteria.rssifactor",
FT_UINT8, BASE_DEC, VALS(btmesh_criteria_rssifactor_vals), 0x60,
NULL, HFILL }
},
{ &hf_btmesh_criteria_receivewindowfactor,
{ "ReceiveWindowFactor", "btmesh.criteria.receivewindowfactor",
FT_UINT8, BASE_DEC, VALS(btmesh_criteria_receivewindowfactor_vals), 0x18,
NULL, HFILL }
},
{ &hf_btmesh_criteria_minqueuesizelog,
{ "MinQueueSizeLog", "btmesh.criteria.minqueuesizelog",
FT_UINT8, BASE_DEC, VALS(btmesh_criteria_minqueuesizelog_vals), 0x07,
NULL, HFILL }
},
{ &hf_btmesh_receivedelay,
{ "ReceiveDelay", "btmesh.receivedelay",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_polltimeout,
{ "PollTimeout", "btmesh.polltimeout",
FT_UINT24, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_previousaddress,
{ "PreviousAddress", "btmesh.previousaddress",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_numelements,
{ "NumElements", "btmesh.numelements",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_lpncounter,
{ "LPNCounter", "btmesh.lpncounter",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_receivewindow,
{ "ReceiveWindow", "btmesh.receivewindow",
FT_UINT8, BASE_DEC | BASE_UNIT_STRING, &units_milliseconds, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_queuesize,
{ "QueueSize", "btmesh.queuesize",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_subscriptionlistsize,
{ "SubscriptionListSize", "btmesh.subscriptionlistsize",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_rssi,
{ "RSSI", "btmesh.rssi",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_friendcounter,
{ "FriendCounter", "btmesh.friendcounter",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_lpnaddress,
{ "LPNAddress", "btmesh.lpnaddress",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_transactionnumber,
{ "TransactionNumber", "btmesh.transactionnumber",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_enc_access_pld,
{ "Encrypted Access Payload", "btmesh.enc_access_pld",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_transtmic,
{ "TransMIC", "btmesh.transtmic",
FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }
},
{ &hf_btmesh_szmic,
{ "SZMIC", "btmesh.szmic",
FT_UINT24, BASE_DEC, VALS(btmesh_szmic_vals), 0x800000,
NULL, HFILL }
},
{ &hf_btmesh_seqzero_data,
{ "SeqZero", "btmesh.seqzero_data",
FT_UINT24, BASE_DEC, NULL, 0x3ffc00,
NULL, HFILL }
},
{ &hf_btmesh_sego,
{ "Segment Offset number(SegO)", "btmesh.sego",
FT_UINT24, BASE_DEC, NULL, 0x0003e0,
NULL, HFILL }
},
{ &hf_btmesh_segn,
{ "Last Segment number(SegN)", "btmesh.segn",
FT_UINT24, BASE_DEC, NULL, 0x00001f,
NULL, HFILL }
},
{ &hf_btmesh_segment,
{ "Sewgment", "btmesh.segment",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL }
},
};
static gint *ett[] = {
&ett_btmesh,
&ett_btmesh_net_pdu,
&ett_btmesh_transp_pdu,
&ett_btmesh_transp_ctrl_msg,
&ett_btmesh_upper_transp_acc_pdu,
};
static ei_register_info ei[] = {
{ &ei_btmesh_not_decoded_yet,{ "btmesh.not_decoded_yet", PI_PROTOCOL, PI_NOTE, "Not decoded yet", EXPFILL } },
{ &ei_btmesh_decrypt_failed,{ "btmesh.decryption_failed", PI_PROTOCOL, PI_WARN, "Decryption failed", EXPFILL } },
};
expert_module_t* expert_btmesh;
module_t *btmesh_module;
/* UAT defenitions */
static uat_field_t btmesh_uat_flds[] = {
UAT_FLD_CSTRING(uat_btmesh_records, network_key_string, "Network Key", "Network Key"),
UAT_FLD_CSTRING(uat_btmesh_records, ivindex_string, "IVindex", "IVindex"),
UAT_END_FIELDS
};
proto_btmesh = proto_register_protocol("Bluetooth Mesh", "BT Mesh", "btmesh");
proto_register_field_array(proto_btmesh, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_btmesh = expert_register_protocol(proto_btmesh);
expert_register_field_array(expert_btmesh, ei, array_length(ei));
btmesh_module = prefs_register_protocol_subtree("Bluetooth", proto_btmesh, NULL);
btmesh_uat = uat_new("BTMesh Network keys",
sizeof(uat_btmesh_record_t), /* record size */
"btmesh_nw_keys", /* filename */
TRUE, /* from_profile */
&uat_btmesh_records, /* data_ptr */
&num_btmesh_uat, /* numitems_ptr */
UAT_AFFECTS_DISSECTION, /* affects dissection of packets, but not set of named fields */
NULL, /* help */
uat_btmesh_record_copy_cb, /* copy callback */
uat_btmesh_record_update_cb, /* update callback */
uat_btmesh_record_free_cb, /* free callback */
NULL, /* post update callback */
NULL, /* reset callback */
btmesh_uat_flds); /* UAT field definitions */
prefs_register_uat_preference(btmesh_module,
"newtwork_key_table",
"Network keys",
"Preconfigured Network keys",
btmesh_uat);
register_dissector("btmesh.msg", dissect_btmesh_msg, proto_btmesh);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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