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net.c
1543 lines (1261 loc) · 43.3 KB
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net.c
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/* Bluetooth Mesh */
/*
* Copyright (c) 2017 Intel Corporation
* Additional Copyright (c) 2018 Espressif Systems (Shanghai) PTE LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include "sdkconfig.h"
#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BLE_MESH_DEBUG_NET)
#include "mesh_util.h"
#include "mesh_buf.h"
#include "mesh_main.h"
#include "mesh_trace.h"
#include "mesh.h"
#include "crypto.h"
#include "adv.h"
#include "mesh.h"
#include "net.h"
#include "lpn.h"
#include "friend.h"
#include "proxy_server.h"
#include "transport.h"
#include "access.h"
#include "foundation.h"
#include "beacon.h"
#include "settings.h"
#include "prov.h"
#include "provisioner_main.h"
#include "proxy_client.h"
/* Minimum valid Mesh Network PDU length. The Network headers
* themselves take up 9 bytes. After that there is a minumum of 1 byte
* payload for both CTL=1 and CTL=0 PDUs (smallest OpCode is 1 byte). CTL=1
* PDUs must use a 64-bit (8 byte) NetMIC, whereas CTL=0 PDUs have at least
* a 32-bit (4 byte) NetMIC and AppMIC giving again a total of 8 bytes.
*/
#define BLE_MESH_NET_MIN_PDU_LEN (BLE_MESH_NET_HDR_LEN + 1 + 8)
/* Seq limit after IV Update is triggered */
#define IV_UPDATE_SEQ_LIMIT 8000000
#define IVI(pdu) ((pdu)[0] >> 7)
#define NID(pdu) ((pdu)[0] & 0x7f)
#define CTL(pdu) ((pdu)[1] >> 7)
#define TTL(pdu) ((pdu)[1] & 0x7f)
#define SEQ(pdu) (((u32_t)(pdu)[2] << 16) | \
((u32_t)(pdu)[3] << 8) | (u32_t)(pdu)[4]);
#define SRC(pdu) (sys_get_be16(&(pdu)[5]))
#define DST(pdu) (sys_get_be16(&(pdu)[7]))
/* Determine how many friendship credentials we need */
#if defined(CONFIG_BLE_MESH_FRIEND)
#define FRIEND_CRED_COUNT CONFIG_BLE_MESH_FRIEND_LPN_COUNT
#elif defined(CONFIG_BLE_MESH_LOW_POWER)
#define FRIEND_CRED_COUNT CONFIG_BLE_MESH_SUBNET_COUNT
#else
#define FRIEND_CRED_COUNT 0
#endif
#if FRIEND_CRED_COUNT > 0
static struct friend_cred friend_cred[FRIEND_CRED_COUNT];
#endif
static u64_t msg_cache[CONFIG_BLE_MESH_MSG_CACHE_SIZE];
static u16_t msg_cache_next;
/* Singleton network context (the implementation only supports one) */
struct bt_mesh_net bt_mesh = {
.local_queue = SYS_SLIST_STATIC_INIT(&bt_mesh.local_queue),
.sub = {
[0 ... (CONFIG_BLE_MESH_SUBNET_COUNT - 1)] = {
.net_idx = BLE_MESH_KEY_UNUSED,
}
},
.app_keys = {
[0 ... (CONFIG_BLE_MESH_APP_KEY_COUNT - 1)] = {
.net_idx = BLE_MESH_KEY_UNUSED,
}
},
};
static u32_t dup_cache[4];
static int dup_cache_next;
#if defined(CONFIG_BLE_MESH_RELAY_ADV_BUF)
#define BLE_MESH_MAX_STORED_RELAY_COUNT (CONFIG_BLE_MESH_RELAY_ADV_BUF_COUNT / 2)
#endif
static bool check_dup(struct net_buf_simple *data)
{
const u8_t *tail = net_buf_simple_tail(data);
u32_t val;
int i;
val = sys_get_be32(tail - 4) ^ sys_get_be32(tail - 8);
for (i = 0; i < ARRAY_SIZE(dup_cache); i++) {
if (dup_cache[i] == val) {
return true;
}
}
dup_cache[dup_cache_next++] = val;
dup_cache_next %= ARRAY_SIZE(dup_cache);
return false;
}
static u64_t msg_hash(struct bt_mesh_net_rx *rx, struct net_buf_simple *pdu)
{
u32_t hash1, hash2;
/* Three least significant bytes of IVI + first byte of SEQ */
hash1 = (BLE_MESH_NET_IVI_RX(rx) << 8) | pdu->data[2];
/* Two last bytes of SEQ + SRC */
memcpy(&hash2, &pdu->data[3], 4);
return (u64_t)hash1 << 32 | (u64_t)hash2;
}
static bool msg_cache_match(struct bt_mesh_net_rx *rx,
struct net_buf_simple *pdu)
{
u64_t hash = msg_hash(rx, pdu);
u16_t i;
for (i = 0U; i < ARRAY_SIZE(msg_cache); i++) {
if (msg_cache[i] == hash) {
return true;
}
}
/* Add to the cache */
rx->msg_cache_idx = msg_cache_next++;
msg_cache[rx->msg_cache_idx] = hash;
msg_cache_next %= ARRAY_SIZE(msg_cache);
return false;
}
struct bt_mesh_subnet *bt_mesh_subnet_get(u16_t net_idx)
{
int i;
if (net_idx == BLE_MESH_KEY_ANY) {
return &bt_mesh.sub[0];
}
for (i = 0; i < ARRAY_SIZE(bt_mesh.sub); i++) {
if (bt_mesh.sub[i].net_idx == net_idx) {
return &bt_mesh.sub[i];
}
}
return NULL;
}
int bt_mesh_net_keys_create(struct bt_mesh_subnet_keys *keys,
const u8_t key[16])
{
u8_t p[] = { 0 };
u8_t nid;
int err;
err = bt_mesh_k2(key, p, sizeof(p), &nid, keys->enc, keys->privacy);
if (err) {
BT_ERR("%s, Unable to generate NID, EncKey & PrivacyKey", __func__);
return err;
}
memcpy(keys->net, key, 16);
keys->nid = nid;
BT_DBG("NID 0x%02x EncKey %s", keys->nid, bt_hex(keys->enc, 16));
BT_DBG("PrivacyKey %s", bt_hex(keys->privacy, 16));
err = bt_mesh_k3(key, keys->net_id);
if (err) {
BT_ERR("%s, Unable to generate Net ID", __func__);
return err;
}
BT_DBG("NetID %s", bt_hex(keys->net_id, 8));
#if defined(CONFIG_BLE_MESH_GATT_PROXY_SERVER)
err = bt_mesh_identity_key(key, keys->identity);
if (err) {
BT_ERR("%s, Unable to generate IdentityKey", __func__);
return err;
}
BT_DBG("IdentityKey %s", bt_hex(keys->identity, 16));
#endif /* GATT_PROXY */
err = bt_mesh_beacon_key(key, keys->beacon);
if (err) {
BT_ERR("%s, Unable to generate beacon key", __func__);
return err;
}
BT_DBG("BeaconKey %s", bt_hex(keys->beacon, 16));
return 0;
}
#if (defined(CONFIG_BLE_MESH_LOW_POWER) || \
defined(CONFIG_BLE_MESH_FRIEND))
int friend_cred_set(struct friend_cred *cred, u8_t idx, const u8_t net_key[16])
{
u16_t lpn_addr, frnd_addr;
int err;
u8_t p[9];
#if defined(CONFIG_BLE_MESH_LOW_POWER)
if (cred->addr == bt_mesh.lpn.frnd) {
lpn_addr = bt_mesh_primary_addr();
frnd_addr = cred->addr;
} else {
lpn_addr = cred->addr;
frnd_addr = bt_mesh_primary_addr();
}
#else
lpn_addr = cred->addr;
frnd_addr = bt_mesh_primary_addr();
#endif
BT_DBG("LPNAddress 0x%04x FriendAddress 0x%04x", lpn_addr, frnd_addr);
BT_DBG("LPNCounter 0x%04x FriendCounter 0x%04x", cred->lpn_counter,
cred->frnd_counter);
p[0] = 0x01;
sys_put_be16(lpn_addr, p + 1);
sys_put_be16(frnd_addr, p + 3);
sys_put_be16(cred->lpn_counter, p + 5);
sys_put_be16(cred->frnd_counter, p + 7);
err = bt_mesh_k2(net_key, p, sizeof(p), &cred->cred[idx].nid,
cred->cred[idx].enc, cred->cred[idx].privacy);
if (err) {
BT_ERR("%s, Unable to generate NID, EncKey & PrivacyKey", __func__);
return err;
}
BT_DBG("Friend NID 0x%02x EncKey %s", cred->cred[idx].nid,
bt_hex(cred->cred[idx].enc, 16));
BT_DBG("Friend PrivacyKey %s", bt_hex(cred->cred[idx].privacy, 16));
return 0;
}
void friend_cred_refresh(u16_t net_idx)
{
int i;
for (i = 0; i < ARRAY_SIZE(friend_cred); i++) {
struct friend_cred *cred = &friend_cred[i];
if (cred->addr != BLE_MESH_ADDR_UNASSIGNED &&
cred->net_idx == net_idx) {
memcpy(&cred->cred[0], &cred->cred[1],
sizeof(cred->cred[0]));
}
}
}
int friend_cred_update(struct bt_mesh_subnet *sub)
{
int err, i;
BT_DBG("net_idx 0x%04x", sub->net_idx);
for (i = 0; i < ARRAY_SIZE(friend_cred); i++) {
struct friend_cred *cred = &friend_cred[i];
if (cred->addr == BLE_MESH_ADDR_UNASSIGNED ||
cred->net_idx != sub->net_idx) {
continue;
}
err = friend_cred_set(cred, 1, sub->keys[1].net);
if (err) {
return err;
}
}
return 0;
}
struct friend_cred *friend_cred_create(struct bt_mesh_subnet *sub, u16_t addr,
u16_t lpn_counter, u16_t frnd_counter)
{
struct friend_cred *cred;
int i, err;
BT_DBG("net_idx 0x%04x addr 0x%04x", sub->net_idx, addr);
for (cred = NULL, i = 0; i < ARRAY_SIZE(friend_cred); i++) {
if ((friend_cred[i].addr == BLE_MESH_ADDR_UNASSIGNED) ||
(friend_cred[i].addr == addr &&
friend_cred[i].net_idx == sub->net_idx)) {
cred = &friend_cred[i];
break;
}
}
if (!cred) {
BT_WARN("No free friend credential slots");
return NULL;
}
cred->net_idx = sub->net_idx;
cred->addr = addr;
cred->lpn_counter = lpn_counter;
cred->frnd_counter = frnd_counter;
err = friend_cred_set(cred, 0, sub->keys[0].net);
if (err) {
friend_cred_clear(cred);
return NULL;
}
if (sub->kr_flag) {
err = friend_cred_set(cred, 1, sub->keys[1].net);
if (err) {
friend_cred_clear(cred);
return NULL;
}
}
return cred;
}
void friend_cred_clear(struct friend_cred *cred)
{
cred->net_idx = BLE_MESH_KEY_UNUSED;
cred->addr = BLE_MESH_ADDR_UNASSIGNED;
cred->lpn_counter = 0U;
cred->frnd_counter = 0U;
(void)memset(cred->cred, 0, sizeof(cred->cred));
}
int friend_cred_del(u16_t net_idx, u16_t addr)
{
int i;
for (i = 0; i < ARRAY_SIZE(friend_cred); i++) {
struct friend_cred *cred = &friend_cred[i];
if (cred->addr == addr && cred->net_idx == net_idx) {
friend_cred_clear(cred);
return 0;
}
}
return -ENOENT;
}
int friend_cred_get(struct bt_mesh_subnet *sub, u16_t addr, u8_t *nid,
const u8_t **enc, const u8_t **priv)
{
int i;
BT_DBG("net_idx 0x%04x addr 0x%04x", sub->net_idx, addr);
for (i = 0; i < ARRAY_SIZE(friend_cred); i++) {
struct friend_cred *cred = &friend_cred[i];
if (cred->net_idx != sub->net_idx) {
continue;
}
if (addr != BLE_MESH_ADDR_UNASSIGNED && cred->addr != addr) {
continue;
}
if (nid) {
*nid = cred->cred[sub->kr_flag].nid;
}
if (enc) {
*enc = cred->cred[sub->kr_flag].enc;
}
if (priv) {
*priv = cred->cred[sub->kr_flag].privacy;
}
return 0;
}
return -ENOENT;
}
#else
int friend_cred_get(struct bt_mesh_subnet *sub, u16_t addr, u8_t *nid,
const u8_t **enc, const u8_t **priv)
{
return -ENOENT;
}
#endif /* FRIEND || LOW_POWER */
u8_t bt_mesh_net_flags(struct bt_mesh_subnet *sub)
{
u8_t flags = 0x00;
if (sub && sub->kr_flag) {
flags |= BLE_MESH_NET_FLAG_KR;
}
if (bt_mesh_atomic_test_bit(bt_mesh.flags, BLE_MESH_IVU_IN_PROGRESS)) {
flags |= BLE_MESH_NET_FLAG_IVU;
}
return flags;
}
int bt_mesh_net_beacon_update(struct bt_mesh_subnet *sub)
{
u8_t flags = bt_mesh_net_flags(sub);
struct bt_mesh_subnet_keys *keys;
if (sub->kr_flag) {
BT_DBG("NetIndex %u Using new key", sub->net_idx);
keys = &sub->keys[1];
} else {
BT_DBG("NetIndex %u Using current key", sub->net_idx);
keys = &sub->keys[0];
}
BT_DBG("flags 0x%02x, IVI 0x%08x", flags, bt_mesh.iv_index);
return bt_mesh_beacon_auth(keys->beacon, flags, keys->net_id,
bt_mesh.iv_index, sub->auth);
}
int bt_mesh_net_create(u16_t idx, u8_t flags, const u8_t key[16],
u32_t iv_index)
{
struct bt_mesh_subnet *sub;
int err;
BT_DBG("idx %u flags 0x%02x iv_index %u", idx, flags, iv_index);
BT_DBG("NetKey %s", bt_hex(key, 16));
(void)memset(msg_cache, 0, sizeof(msg_cache));
msg_cache_next = 0U;
sub = &bt_mesh.sub[0];
sub->kr_flag = BLE_MESH_KEY_REFRESH(flags);
if (sub->kr_flag) {
err = bt_mesh_net_keys_create(&sub->keys[1], key);
if (err) {
return -EIO;
}
sub->kr_phase = BLE_MESH_KR_PHASE_2;
} else {
err = bt_mesh_net_keys_create(&sub->keys[0], key);
if (err) {
return -EIO;
}
}
sub->net_idx = idx;
if (IS_ENABLED(CONFIG_BLE_MESH_GATT_PROXY_SERVER)) {
sub->node_id = BLE_MESH_NODE_IDENTITY_STOPPED;
} else {
sub->node_id = BLE_MESH_NODE_IDENTITY_NOT_SUPPORTED;
}
bt_mesh.iv_index = iv_index;
bt_mesh_atomic_set_bit_to(bt_mesh.flags, BLE_MESH_IVU_IN_PROGRESS,
BLE_MESH_IV_UPDATE(flags));
/* Set minimum required hours, since the 96-hour minimum requirement
* doesn't apply straight after provisioning (since we can't know how
* long has actually passed since the network changed its state).
*/
bt_mesh.ivu_duration = BLE_MESH_IVU_MIN_HOURS;
/* Make sure we have valid beacon data to be sent */
bt_mesh_net_beacon_update(sub);
return 0;
}
void bt_mesh_net_revoke_keys(struct bt_mesh_subnet *sub)
{
int i;
BT_DBG("idx 0x%04x", sub->net_idx);
memcpy(&sub->keys[0], &sub->keys[1], sizeof(sub->keys[0]));
for (i = 0; i < ARRAY_SIZE(bt_mesh.app_keys); i++) {
struct bt_mesh_app_key *key = &bt_mesh.app_keys[i];
if (key->net_idx != sub->net_idx || !key->updated) {
continue;
}
memcpy(&key->keys[0], &key->keys[1], sizeof(key->keys[0]));
key->updated = false;
}
}
bool bt_mesh_kr_update(struct bt_mesh_subnet *sub, u8_t new_kr, bool new_key)
{
if (new_kr != sub->kr_flag && sub->kr_phase == BLE_MESH_KR_NORMAL) {
BT_WARN("KR change in normal operation. Are we blacklisted?");
return false;
}
sub->kr_flag = new_kr;
if (sub->kr_flag) {
if (sub->kr_phase == BLE_MESH_KR_PHASE_1) {
BT_DBG("Phase 1 -> Phase 2");
sub->kr_phase = BLE_MESH_KR_PHASE_2;
return true;
}
} else {
switch (sub->kr_phase) {
case BLE_MESH_KR_PHASE_1:
if (!new_key) {
/* Ignore */
break;
}
/* Upon receiving a Secure Network beacon with the KR flag set
* to 0 using the new NetKey in Phase 1, the node shall
* immediately transition to Phase 3, which effectively skips
* Phase 2.
*
* Intentional fall-through.
*/
case BLE_MESH_KR_PHASE_2:
BT_DBG("KR Phase 0x%02x -> Normal", sub->kr_phase);
bt_mesh_net_revoke_keys(sub);
if (IS_ENABLED(CONFIG_BLE_MESH_LOW_POWER) ||
IS_ENABLED(CONFIG_BLE_MESH_FRIEND)) {
friend_cred_refresh(sub->net_idx);
}
sub->kr_phase = BLE_MESH_KR_NORMAL;
return true;
}
}
return false;
}
void bt_mesh_rpl_reset(void)
{
int i;
/* Discard "old old" IV Index entries from RPL and flag
* any other ones (which are valid) as old.
*/
for (i = 0; i < ARRAY_SIZE(bt_mesh.rpl); i++) {
struct bt_mesh_rpl *rpl = &bt_mesh.rpl[i];
if (rpl->src) {
if (rpl->old_iv) {
(void)memset(rpl, 0, sizeof(*rpl));
} else {
rpl->old_iv = true;
}
}
}
}
#if defined(CONFIG_BLE_MESH_IV_UPDATE_TEST)
void bt_mesh_iv_update_test(bool enable)
{
bt_mesh_atomic_set_bit_to(bt_mesh.flags, BLE_MESH_IVU_TEST, enable);
/* Reset the duration variable - needed for some PTS tests */
bt_mesh.ivu_duration = 0U;
}
bool bt_mesh_iv_update(void)
{
if (!bt_mesh_is_provisioned()) {
BT_ERR("%s, Not yet provisioned", __func__);
return false;
}
if (bt_mesh_atomic_test_bit(bt_mesh.flags, BLE_MESH_IVU_IN_PROGRESS)) {
bt_mesh_net_iv_update(bt_mesh.iv_index, false);
} else {
bt_mesh_net_iv_update(bt_mesh.iv_index + 1, true);
}
bt_mesh_net_sec_update(NULL);
return bt_mesh_atomic_test_bit(bt_mesh.flags, BLE_MESH_IVU_IN_PROGRESS);
}
#endif /* CONFIG_BLE_MESH_IV_UPDATE_TEST */
/* Used for sending immediate beacons to Friend queues and GATT clients */
void bt_mesh_net_sec_update(struct bt_mesh_subnet *sub)
{
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND)) {
bt_mesh_friend_sec_update(sub ? sub->net_idx : BLE_MESH_KEY_ANY);
}
if (IS_ENABLED(CONFIG_BLE_MESH_GATT_PROXY_SERVER) &&
bt_mesh_gatt_proxy_get() == BLE_MESH_GATT_PROXY_ENABLED) {
#if CONFIG_BLE_MESH_NODE
bt_mesh_proxy_beacon_send(sub);
#endif
}
}
bool bt_mesh_net_iv_update(u32_t iv_index, bool iv_update)
{
int i;
if (bt_mesh_atomic_test_bit(bt_mesh.flags, BLE_MESH_IVU_IN_PROGRESS)) {
/* We're currently in IV Update mode */
if (iv_index != bt_mesh.iv_index) {
BT_WARN("IV Index mismatch: 0x%08x != 0x%08x",
iv_index, bt_mesh.iv_index);
return false;
}
if (iv_update) {
/* Nothing to do */
BT_DBG("Already in IV Update in Progress state");
return false;
}
} else {
/* We're currently in Normal mode */
if (iv_index == bt_mesh.iv_index) {
BT_DBG("Same IV Index in normal mode");
return false;
}
if (iv_index < bt_mesh.iv_index ||
iv_index > bt_mesh.iv_index + 42) {
BT_ERR("IV Index out of sync: 0x%08x != 0x%08x",
iv_index, bt_mesh.iv_index);
return false;
}
if (iv_index > bt_mesh.iv_index + 1) {
BT_WARN("Performing IV Index Recovery");
(void)memset(bt_mesh.rpl, 0, sizeof(bt_mesh.rpl));
bt_mesh.iv_index = iv_index;
bt_mesh.seq = 0U;
goto do_update;
}
if (iv_index == bt_mesh.iv_index + 1 && !iv_update) {
BT_WARN("Ignoring new index in normal mode");
return false;
}
if (!iv_update) {
/* Nothing to do */
BT_DBG("Already in Normal state");
return false;
}
}
if (!(IS_ENABLED(CONFIG_BLE_MESH_IV_UPDATE_TEST) &&
bt_mesh_atomic_test_bit(bt_mesh.flags, BLE_MESH_IVU_TEST))) {
if (bt_mesh.ivu_duration < BLE_MESH_IVU_MIN_HOURS) {
BT_WARN("IV Update before minimum duration");
return false;
}
}
/* Defer change to Normal Operation if there are pending acks */
if (!iv_update && bt_mesh_tx_in_progress()) {
BT_WARN("IV Update deferred because of pending transfer");
bt_mesh_atomic_set_bit(bt_mesh.flags, BLE_MESH_IVU_PENDING);
return false;
}
do_update:
bt_mesh_atomic_set_bit_to(bt_mesh.flags, BLE_MESH_IVU_IN_PROGRESS, iv_update);
bt_mesh.ivu_duration = 0U;
if (iv_update) {
bt_mesh.iv_index = iv_index;
BT_DBG("IV Update state entered. New index 0x%08x",
bt_mesh.iv_index);
bt_mesh_rpl_reset();
} else {
BT_DBG("Normal mode entered");
bt_mesh.seq = 0U;
}
k_delayed_work_submit(&bt_mesh.ivu_timer, BLE_MESH_IVU_TIMEOUT);
for (i = 0; i < ARRAY_SIZE(bt_mesh.sub); i++) {
if (bt_mesh.sub[i].net_idx != BLE_MESH_KEY_UNUSED) {
bt_mesh_net_beacon_update(&bt_mesh.sub[i]);
}
}
if (IS_ENABLED(CONFIG_BLE_MESH_SETTINGS)) {
bt_mesh_store_iv(false);
}
return true;
}
u32_t bt_mesh_next_seq(void)
{
u32_t seq = bt_mesh.seq++;
if (IS_ENABLED(CONFIG_BLE_MESH_SETTINGS)) {
bt_mesh_store_seq();
}
if (!bt_mesh_atomic_test_bit(bt_mesh.flags, BLE_MESH_IVU_IN_PROGRESS) &&
bt_mesh.seq > IV_UPDATE_SEQ_LIMIT &&
bt_mesh_subnet_get(BLE_MESH_KEY_PRIMARY)) {
#if CONFIG_BLE_MESH_NODE
bt_mesh_beacon_ivu_initiator(true);
#endif
bt_mesh_net_iv_update(bt_mesh.iv_index + 1, true);
bt_mesh_net_sec_update(NULL);
}
return seq;
}
int bt_mesh_net_resend(struct bt_mesh_subnet *sub, struct net_buf *buf,
bool new_key, const struct bt_mesh_send_cb *cb,
void *cb_data)
{
const u8_t *enc, *priv;
u32_t seq;
u16_t dst;
int err;
BT_DBG("net_idx 0x%04x new_key %u len %u", sub->net_idx, new_key,
buf->len);
enc = sub->keys[new_key].enc;
priv = sub->keys[new_key].privacy;
err = bt_mesh_net_obfuscate(buf->data, BLE_MESH_NET_IVI_TX, priv);
if (err) {
BT_ERR("%s, Deobfuscate failed (err %d)", __func__, err);
return err;
}
err = bt_mesh_net_decrypt(enc, &buf->b, BLE_MESH_NET_IVI_TX, false);
if (err) {
BT_ERR("%s, Decrypt failed (err %d)", __func__, err);
return err;
}
/* Update with a new sequence number */
seq = bt_mesh_next_seq();
buf->data[2] = seq >> 16;
buf->data[3] = seq >> 8;
buf->data[4] = seq;
/* Get destination, in case it's a proxy client */
dst = DST(buf->data);
err = bt_mesh_net_encrypt(enc, &buf->b, BLE_MESH_NET_IVI_TX, false);
if (err) {
BT_ERR("%s, Encrypt failed (err %d)", __func__, err);
return err;
}
err = bt_mesh_net_obfuscate(buf->data, BLE_MESH_NET_IVI_TX, priv);
if (err) {
BT_ERR("%s, Obfuscate failed (err %d)", __func__, err);
return err;
}
if (IS_ENABLED(CONFIG_BLE_MESH_GATT_PROXY_SERVER) &&
bt_mesh_proxy_relay(&buf->b, dst)) {
send_cb_finalize(cb, cb_data);
return 0;
}
bt_mesh_adv_send(buf, cb, cb_data);
return 0;
}
static void bt_mesh_net_local(struct k_work *work)
{
struct net_buf *buf;
while ((buf = net_buf_slist_get(&bt_mesh.local_queue))) {
BT_DBG("len %u: %s", buf->len, bt_hex(buf->data, buf->len));
bt_mesh_net_recv(&buf->b, 0, BLE_MESH_NET_IF_LOCAL);
net_buf_unref(buf);
}
}
int bt_mesh_net_encode(struct bt_mesh_net_tx *tx, struct net_buf_simple *buf,
bool proxy)
{
const bool ctl = (tx->ctx->app_idx == BLE_MESH_KEY_UNUSED);
u32_t seq_val;
u8_t nid;
const u8_t *enc, *priv;
u8_t *seq;
int err;
if (ctl && net_buf_simple_tailroom(buf) < 8) {
BT_ERR("%s, Insufficient MIC space for CTL PDU", __func__);
return -EINVAL;
} else if (net_buf_simple_tailroom(buf) < 4) {
BT_ERR("%s, Insufficient MIC space for PDU", __func__);
return -EINVAL;
}
BT_DBG("src 0x%04x dst 0x%04x ctl %u seq 0x%06x",
tx->src, tx->ctx->addr, ctl, bt_mesh.seq);
net_buf_simple_push_be16(buf, tx->ctx->addr);
net_buf_simple_push_be16(buf, tx->src);
seq = net_buf_simple_push(buf, 3);
seq_val = bt_mesh_next_seq();
seq[0] = seq_val >> 16;
seq[1] = seq_val >> 8;
seq[2] = seq_val;
if (ctl) {
net_buf_simple_push_u8(buf, tx->ctx->send_ttl | 0x80);
} else {
net_buf_simple_push_u8(buf, tx->ctx->send_ttl);
}
if (IS_ENABLED(CONFIG_BLE_MESH_LOW_POWER) && tx->friend_cred) {
if (friend_cred_get(tx->sub, BLE_MESH_ADDR_UNASSIGNED,
&nid, &enc, &priv)) {
BT_WARN("Falling back to master credentials");
tx->friend_cred = 0U;
nid = tx->sub->keys[tx->sub->kr_flag].nid;
enc = tx->sub->keys[tx->sub->kr_flag].enc;
priv = tx->sub->keys[tx->sub->kr_flag].privacy;
}
} else {
tx->friend_cred = 0U;
nid = tx->sub->keys[tx->sub->kr_flag].nid;
enc = tx->sub->keys[tx->sub->kr_flag].enc;
priv = tx->sub->keys[tx->sub->kr_flag].privacy;
}
net_buf_simple_push_u8(buf, (nid | (BLE_MESH_NET_IVI_TX & 1) << 7));
err = bt_mesh_net_encrypt(enc, buf, BLE_MESH_NET_IVI_TX, proxy);
if (err) {
return err;
}
return bt_mesh_net_obfuscate(buf->data, BLE_MESH_NET_IVI_TX, priv);
}
int bt_mesh_net_send(struct bt_mesh_net_tx *tx, struct net_buf *buf,
const struct bt_mesh_send_cb *cb, void *cb_data)
{
int err;
BT_DBG("src 0x%04x dst 0x%04x len %u headroom %u tailroom %u",
tx->src, tx->ctx->addr, buf->len, net_buf_headroom(buf),
net_buf_tailroom(buf));
BT_DBG("Payload len %u: %s", buf->len, bt_hex(buf->data, buf->len));
BT_DBG("Seq 0x%06x", bt_mesh.seq);
if (tx->ctx->send_ttl == BLE_MESH_TTL_DEFAULT) {
tx->ctx->send_ttl = bt_mesh_default_ttl_get();
}
err = bt_mesh_net_encode(tx, &buf->b, false);
if (err) {
goto done;
}
/* Deliver to GATT Proxy Clients if necessary. Mesh spec 3.4.5.2:
* "The output filter of the interface connected to advertising or
* GATT bearers shall drop all messages with TTL value set to 1."
*/
#if CONFIG_BLE_MESH_NODE
if (bt_mesh_is_provisioned()) {
if (IS_ENABLED(CONFIG_BLE_MESH_GATT_PROXY_SERVER) &&
tx->ctx->send_ttl != 1U) {
if (bt_mesh_proxy_relay(&buf->b, tx->ctx->addr) &&
BLE_MESH_ADDR_IS_UNICAST(tx->ctx->addr)) {
/* Notify completion if this only went
* through the Mesh Proxy.
*/
send_cb_finalize(cb, cb_data);
err = 0;
goto done;
}
}
}
#endif
#if CONFIG_BLE_MESH_GATT_PROXY_CLIENT
if (tx->ctx->send_ttl != 1U) {
if (bt_mesh_proxy_client_send(&buf->b, tx->ctx->addr)) {
/* If Proxy Client succeeds to send messages with GATT bearer,
* we can directly finish here. And if not, which means no
* connection has been created with Proxy Client, here we will
* use advertising bearer for the messages.
*/
send_cb_finalize(cb, cb_data);
err = 0;
goto done;
}
}
#endif
/* Deliver to local network interface if necessary */
if (IS_ENABLED(CONFIG_BLE_MESH_NODE) && bt_mesh_is_provisioned() &&
(bt_mesh_fixed_group_match(tx->ctx->addr) ||
bt_mesh_elem_find(tx->ctx->addr))) {
if (cb && cb->start) {
cb->start(0, 0, cb_data);
}
net_buf_slist_put(&bt_mesh.local_queue, net_buf_ref(buf));
if (cb && cb->end) {
cb->end(0, cb_data);
}
k_work_submit(&bt_mesh.local_work);
} else if (tx->ctx->send_ttl != 1U) {
/* Deliver to the advertising network interface. Mesh spec
* 3.4.5.2: "The output filter of the interface connected to
* advertising or GATT bearers shall drop all messages with
* TTL value set to 1."
*/
bt_mesh_adv_send(buf, cb, cb_data);
}
done:
net_buf_unref(buf);
return err;
}
static bool auth_match(struct bt_mesh_subnet_keys *keys,
const u8_t net_id[8], u8_t flags,
u32_t iv_index, const u8_t auth[8])
{
u8_t net_auth[8];
if (memcmp(net_id, keys->net_id, 8)) {
return false;
}
bt_mesh_beacon_auth(keys->beacon, flags, keys->net_id, iv_index,
net_auth);
if (memcmp(auth, net_auth, 8)) {
BT_WARN("Authentication Value %s != %s",
bt_hex(auth, 8), bt_hex(net_auth, 8));
return false;
}
return true;
}
struct bt_mesh_subnet *bt_mesh_subnet_find(const u8_t net_id[8], u8_t flags,
u32_t iv_index, const u8_t auth[8],
bool *new_key)
{
int i;
for (i = 0; i < ARRAY_SIZE(bt_mesh.sub); i++) {
struct bt_mesh_subnet *sub = &bt_mesh.sub[i];
if (sub->net_idx == BLE_MESH_KEY_UNUSED) {
continue;
}
if (auth_match(&sub->keys[0], net_id, flags, iv_index, auth)) {
*new_key = false;
return sub;
}