blob: b6f488dc5425094003ce5f95b7331a242d55610a [file] [log] [blame]
/*
* Copyright (c) 2017 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <string.h>
#include <errno.h>
#include <stdbool.h>
#include <sys/atomic.h>
#include <sys/util.h>
#include <sys/byteorder.h>
#include <net/buf.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/conn.h>
#include <bluetooth/mesh.h>
#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_MESH_DEBUG_NET)
#define LOG_MODULE_NAME bt_mesh_net
#include "common/log.h"
#include "crypto.h"
#include "adv.h"
#include "mesh.h"
#include "net.h"
#include "rpl.h"
#include "lpn.h"
#include "friend.h"
#include "proxy.h"
#include "proxy_cli.h"
#include "transport.h"
#include "access.h"
#include "foundation.h"
#include "beacon.h"
#include "settings.h"
#include "host/ecc.h"
#include "prov.h"
#include "cfg.h"
#define LOOPBACK_MAX_PDU_LEN (BT_MESH_NET_HDR_LEN + 16)
/* Seq limit after IV Update is triggered */
#define IV_UPDATE_SEQ_LIMIT CONFIG_BT_MESH_IV_UPDATE_SEQ_LIMIT
#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) (sys_get_be24(&pdu[2]))
#define SRC(pdu) (sys_get_be16(&(pdu)[5]))
#define DST(pdu) (sys_get_be16(&(pdu)[7]))
/** Define CONFIG_BT_MESH_SEQ_STORE_RATE even if settings are disabled to
* compile the code.
*/
#ifndef CONFIG_BT_SETTINGS
#define CONFIG_BT_MESH_SEQ_STORE_RATE 1
#endif
/* Mesh network information for persistent storage. */
struct net_val {
uint16_t primary_addr;
uint8_t dev_key[16];
} __packed;
/* Sequence number information for persistent storage. */
struct seq_val {
uint8_t val[3];
} __packed;
/* IV Index & IV Update information for persistent storage. */
struct iv_val {
uint32_t iv_index;
uint8_t iv_update:1,
iv_duration:7;
} __packed;
static struct {
uint32_t src : 15, /* MSb of source is always 0 */
seq : 17;
} msg_cache[CONFIG_BT_MESH_MSG_CACHE_SIZE];
static uint16_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),
};
/* Mesh Profile Specification 3.10.6
* The node shall not execute more than one IV Index Recovery within a period of
* 192 hours.
*
* Mark that the IV Index Recovery has been done to prevent two recoveries to be
* done before a normal IV Index update has been completed within 96h+96h.
*/
static bool ivi_was_recovered;
struct loopback_buf {
sys_snode_t node;
struct bt_mesh_subnet *sub;
uint8_t len;
uint8_t data[LOOPBACK_MAX_PDU_LEN];
};
K_MEM_SLAB_DEFINE(loopback_buf_pool,
sizeof(struct loopback_buf),
CONFIG_BT_MESH_LOOPBACK_BUFS, __alignof__(struct loopback_buf));
static uint32_t dup_cache[CONFIG_BT_MESH_MSG_CACHE_SIZE];
static int dup_cache_next;
static bool check_dup(struct net_buf_simple *data)
{
const uint8_t *tail = net_buf_simple_tail(data);
uint32_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 bool msg_cache_match(struct net_buf_simple *pdu)
{
uint16_t i;
for (i = 0U; i < ARRAY_SIZE(msg_cache); i++) {
if (msg_cache[i].src == SRC(pdu->data) &&
msg_cache[i].seq == (SEQ(pdu->data) & BIT_MASK(17))) {
return true;
}
}
return false;
}
static void msg_cache_add(struct bt_mesh_net_rx *rx)
{
rx->msg_cache_idx = msg_cache_next++;
msg_cache[rx->msg_cache_idx].src = rx->ctx.addr;
msg_cache[rx->msg_cache_idx].seq = rx->seq;
msg_cache_next %= ARRAY_SIZE(msg_cache);
}
static void store_iv(bool only_duration)
{
bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_IV_PENDING);
if (!only_duration) {
/* Always update Seq whenever IV changes */
bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_SEQ_PENDING);
}
}
static void store_seq(void)
{
if (CONFIG_BT_MESH_SEQ_STORE_RATE > 1 &&
(bt_mesh.seq % CONFIG_BT_MESH_SEQ_STORE_RATE)) {
return;
}
bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_SEQ_PENDING);
}
int bt_mesh_net_create(uint16_t idx, uint8_t flags, const uint8_t key[16],
uint32_t iv_index)
{
int err;
BT_DBG("idx %u flags 0x%02x iv_index %u", idx, flags, iv_index);
BT_DBG("NetKey %s", bt_hex(key, 16));
if (BT_MESH_KEY_REFRESH(flags)) {
err = bt_mesh_subnet_set(idx, BT_MESH_KR_PHASE_2, NULL, key);
} else {
err = bt_mesh_subnet_set(idx, BT_MESH_KR_NORMAL, key, NULL);
}
if (err) {
BT_ERR("Failed creating subnet");
return err;
}
(void)memset(msg_cache, 0, sizeof(msg_cache));
msg_cache_next = 0U;
bt_mesh.iv_index = iv_index;
atomic_set_bit_to(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS,
BT_MESH_IV_UPDATE(flags));
/* If IV Update is already in progress, set minimum required hours,
* since the 96-hour minimum requirement doesn't apply in this case straight
* after provisioning.
*/
if (BT_MESH_IV_UPDATE(flags)) {
bt_mesh.ivu_duration = BT_MESH_IVU_MIN_HOURS;
}
if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
BT_DBG("Storing network information persistently");
bt_mesh_subnet_store(idx);
store_iv(false);
}
return 0;
}
#if defined(CONFIG_BT_MESH_IV_UPDATE_TEST)
void bt_mesh_iv_update_test(bool enable)
{
atomic_set_bit_to(bt_mesh.flags, BT_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("Not yet provisioned");
return false;
}
if (atomic_test_bit(bt_mesh.flags, BT_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);
}
return atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS);
}
#endif /* CONFIG_BT_MESH_IV_UPDATE_TEST */
static bool is_iv_recovery(uint32_t iv_index, bool iv_update)
{
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) ||
(iv_index == bt_mesh.iv_index + 1 &&
(atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS) || !iv_update))) {
if (ivi_was_recovered &&
(bt_mesh.ivu_duration < (2 * BT_MESH_IVU_MIN_HOURS))) {
BT_ERR("IV Index Recovery before minimum delay");
return false;
}
/* The Mesh profile specification allows to initiate an
* IV Index Recovery procedure if previous IV update has
* been missed. This allows the node to remain
* functional.
*
* Upon receiving and successfully authenticating a
* Secure Network beacon for a primary subnet whose
* IV Index is 1 or more higher than the current known IV
* Index, the node shall set its current IV Index and its
* current IV Update procedure state from the values in
* this Secure Network beacon.
*/
BT_WARN("Performing IV Index Recovery");
ivi_was_recovered = true;
bt_mesh_rpl_clear();
bt_mesh.iv_index = iv_index;
bt_mesh.seq = 0U;
return true;
}
return false;
}
bool bt_mesh_net_iv_update(uint32_t iv_index, bool iv_update)
{
if (atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS)) {
/* We're currently in IV Update mode */
if (iv_index != bt_mesh.iv_index) {
if (is_iv_recovery(iv_index, iv_update)) {
goto do_update;
}
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 + 1) {
if (is_iv_recovery(iv_index, iv_update)) {
goto do_update;
}
return false;
}
if (!iv_update) {
/* Nothing to do */
BT_DBG("Already in IV normal mode");
return false;
}
}
if (!(IS_ENABLED(CONFIG_BT_MESH_IV_UPDATE_TEST) &&
atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_TEST))) {
if (bt_mesh.ivu_duration < BT_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");
atomic_set_bit(bt_mesh.flags, BT_MESH_IVU_PENDING);
return false;
}
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();
ivi_was_recovered = false;
} else {
BT_DBG("Normal mode entered");
bt_mesh.seq = 0U;
}
do_update:
atomic_set_bit_to(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS, iv_update);
bt_mesh.ivu_duration = 0U;
k_work_reschedule(&bt_mesh.ivu_timer, BT_MESH_IVU_TIMEOUT);
/* Notify other modules */
if (IS_ENABLED(CONFIG_BT_MESH_FRIEND)) {
bt_mesh_friend_sec_update(BT_MESH_KEY_ANY);
}
bt_mesh_subnet_foreach(bt_mesh_beacon_update);
if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) &&
bt_mesh_gatt_proxy_get() == BT_MESH_GATT_PROXY_ENABLED) {
bt_mesh_proxy_beacon_send(NULL);
}
if (IS_ENABLED(CONFIG_BT_MESH_CDB)) {
bt_mesh_cdb_iv_update(iv_index, iv_update);
}
if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
store_iv(false);
}
return true;
}
uint32_t bt_mesh_next_seq(void)
{
uint32_t seq = bt_mesh.seq++;
if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
store_seq();
}
if (!atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS) &&
bt_mesh.seq > IV_UPDATE_SEQ_LIMIT &&
bt_mesh_subnet_get(BT_MESH_KEY_PRIMARY)) {
bt_mesh_beacon_ivu_initiator(true);
bt_mesh_net_iv_update(bt_mesh.iv_index + 1, true);
}
return seq;
}
static void bt_mesh_net_local(struct k_work *work)
{
struct net_buf_simple sbuf;
sys_snode_t *node;
while ((node = sys_slist_get(&bt_mesh.local_queue))) {
struct loopback_buf *buf = CONTAINER_OF(node, struct loopback_buf, node);
struct bt_mesh_net_rx rx = {
.ctx = {
.net_idx = buf->sub->net_idx,
/* Initialize AppIdx to a sane value */
.app_idx = BT_MESH_KEY_UNUSED,
.recv_ttl = TTL(buf->data),
/* TTL=1 only goes to local IF */
.send_ttl = 1U,
.addr = SRC(buf->data),
.recv_dst = DST(buf->data),
.recv_rssi = 0,
},
.net_if = BT_MESH_NET_IF_LOCAL,
.sub = buf->sub,
.old_iv = (IVI(buf->data) != (bt_mesh.iv_index & 0x01)),
.ctl = CTL(buf->data),
.seq = SEQ(buf->data),
.new_key = SUBNET_KEY_TX_IDX(buf->sub),
.local_match = 1U,
.friend_match = 0U,
};
BT_DBG("src: 0x%04x dst: 0x%04x seq 0x%06x sub %p", rx.ctx.addr,
rx.ctx.addr, rx.seq, buf->sub);
net_buf_simple_init_with_data(&sbuf, buf->data, buf->len);
(void)bt_mesh_trans_recv(&sbuf, &rx);
k_mem_slab_free(&loopback_buf_pool, (void **)&buf);
}
}
static const struct bt_mesh_net_cred *net_tx_cred_get(struct bt_mesh_net_tx *tx)
{
#if defined(CONFIG_BT_MESH_LOW_POWER)
if (tx->friend_cred && bt_mesh.lpn.frnd) {
return &bt_mesh.lpn.cred[SUBNET_KEY_TX_IDX(tx->sub)];
}
#endif
tx->friend_cred = 0U;
return &tx->sub->keys[SUBNET_KEY_TX_IDX(tx->sub)].msg;
}
static int net_header_encode(struct bt_mesh_net_tx *tx, uint8_t nid,
struct net_buf_simple *buf)
{
const bool ctl = (tx->ctx->app_idx == BT_MESH_KEY_UNUSED);
if (ctl && net_buf_simple_tailroom(buf) < 8) {
BT_ERR("Insufficient MIC space for CTL PDU");
return -EINVAL;
} else if (net_buf_simple_tailroom(buf) < 4) {
BT_ERR("Insufficient MIC space for PDU");
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);
net_buf_simple_push_be24(buf, bt_mesh_next_seq());
if (ctl) {
net_buf_simple_push_u8(buf, tx->ctx->send_ttl | 0x80);
} else {
net_buf_simple_push_u8(buf, tx->ctx->send_ttl);
}
net_buf_simple_push_u8(buf, (nid | (BT_MESH_NET_IVI_TX & 1) << 7));
return 0;
}
static int net_encrypt(struct net_buf_simple *buf,
const struct bt_mesh_net_cred *cred, uint32_t iv_index,
bool proxy)
{
int err;
err = bt_mesh_net_encrypt(cred->enc, buf, iv_index, proxy);
if (err) {
return err;
}
return bt_mesh_net_obfuscate(buf->data, iv_index, cred->privacy);
}
int bt_mesh_net_encode(struct bt_mesh_net_tx *tx, struct net_buf_simple *buf,
bool proxy)
{
const struct bt_mesh_net_cred *cred;
int err;
cred = net_tx_cred_get(tx);
err = net_header_encode(tx, cred->nid, buf);
if (err) {
return err;
}
return net_encrypt(buf, cred, BT_MESH_NET_IVI_TX, proxy);
}
static int loopback(const struct bt_mesh_net_tx *tx, const uint8_t *data,
size_t len)
{
int err;
struct loopback_buf *buf;
err = k_mem_slab_alloc(&loopback_buf_pool, (void **)&buf, K_NO_WAIT);
if (err) {
BT_WARN("Unable to allocate loopback");
return -ENOMEM;
}
buf->sub = tx->sub;
(void)memcpy(buf->data, data, len);
buf->len = len;
sys_slist_append(&bt_mesh.local_queue, &buf->node);
k_work_submit(&bt_mesh.local_work);
return 0;
}
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)
{
const struct bt_mesh_net_cred *cred;
int err;
BT_DBG("src 0x%04x dst 0x%04x len %u headroom %zu tailroom %zu",
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);
cred = net_tx_cred_get(tx);
err = net_header_encode(tx, cred->nid, &buf->b);
if (err) {
goto done;
}
/* Deliver to local network interface if necessary */
if (bt_mesh_fixed_group_match(tx->ctx->addr) ||
bt_mesh_has_addr(tx->ctx->addr)) {
err = loopback(tx, buf->data, buf->len);
/* Local unicast messages should not go out to network */
if (BT_MESH_ADDR_IS_UNICAST(tx->ctx->addr) ||
tx->ctx->send_ttl == 1U) {
if (!err) {
send_cb_finalize(cb, cb_data);
}
goto done;
}
}
/* 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 a TTL=1 packet wasn't for a local interface, it is
* invalid.
*/
if (tx->ctx->send_ttl == 1U) {
err = -EINVAL;
goto done;
}
err = net_encrypt(&buf->b, cred, BT_MESH_NET_IVI_TX, false);
if (err) {
goto done;
}
BT_MESH_ADV(buf)->cb = cb;
BT_MESH_ADV(buf)->cb_data = cb_data;
/* Deliver to GATT Proxy Clients if necessary. */
if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) &&
bt_mesh_proxy_relay(buf, tx->ctx->addr) &&
BT_MESH_ADDR_IS_UNICAST(tx->ctx->addr)) {
err = 0;
goto done;
}
/* Deliver to GATT Proxy Servers if necessary. */
if (IS_ENABLED(CONFIG_BT_MESH_PROXY_CLIENT)) {
(void)bt_mesh_proxy_cli_relay(buf);
}
bt_mesh_adv_send(buf, cb, cb_data);
done:
net_buf_unref(buf);
return err;
}
void bt_mesh_net_loopback_clear(uint16_t net_idx)
{
sys_slist_t new_list;
sys_snode_t *node;
BT_DBG("0x%04x", net_idx);
sys_slist_init(&new_list);
while ((node = sys_slist_get(&bt_mesh.local_queue))) {
struct loopback_buf *buf = CONTAINER_OF(node, struct loopback_buf, node);
if (net_idx == BT_MESH_KEY_ANY || net_idx == buf->sub->net_idx) {
BT_DBG("Dropped 0x%06x", SEQ(buf->data));
k_mem_slab_free(&loopback_buf_pool, (void **)&buf);
} else {
sys_slist_append(&new_list, &buf->node);
}
}
bt_mesh.local_queue = new_list;
}
static bool net_decrypt(struct bt_mesh_net_rx *rx, struct net_buf_simple *in,
struct net_buf_simple *out,
const struct bt_mesh_net_cred *cred)
{
bool proxy = (rx->net_if == BT_MESH_NET_IF_PROXY_CFG);
if (NID(in->data) != cred->nid) {
return false;
}
BT_DBG("NID 0x%02x", NID(in->data));
BT_DBG("IVI %u net->iv_index 0x%08x", IVI(in->data), bt_mesh.iv_index);
rx->old_iv = (IVI(in->data) != (bt_mesh.iv_index & 0x01));
net_buf_simple_reset(out);
net_buf_simple_add_mem(out, in->data, in->len);
if (bt_mesh_net_obfuscate(out->data, BT_MESH_NET_IVI_RX(rx),
cred->privacy)) {
return false;
}
rx->ctx.addr = SRC(out->data);
if (!BT_MESH_ADDR_IS_UNICAST(rx->ctx.addr)) {
BT_DBG("Ignoring non-unicast src addr 0x%04x", rx->ctx.addr);
return false;
}
if (bt_mesh_has_addr(rx->ctx.addr)) {
BT_DBG("Dropping locally originated packet");
return false;
}
if (rx->net_if == BT_MESH_NET_IF_ADV && msg_cache_match(out)) {
BT_DBG("Duplicate found in Network Message Cache");
return false;
}
BT_DBG("src 0x%04x", rx->ctx.addr);
return bt_mesh_net_decrypt(cred->enc, out, BT_MESH_NET_IVI_RX(rx),
proxy) == 0;
}
/* Relaying from advertising to the advertising bearer should only happen
* if the Relay state is set to enabled. Locally originated packets always
* get sent to the advertising bearer. If the packet came in through GATT,
* then we should only relay it if the GATT Proxy state is enabled.
*/
static bool relay_to_adv(enum bt_mesh_net_if net_if)
{
switch (net_if) {
case BT_MESH_NET_IF_ADV:
return (bt_mesh_relay_get() == BT_MESH_RELAY_ENABLED);
case BT_MESH_NET_IF_PROXY:
return (bt_mesh_gatt_proxy_get() == BT_MESH_GATT_PROXY_ENABLED);
default:
return false;
}
}
static void bt_mesh_net_relay(struct net_buf_simple *sbuf,
struct bt_mesh_net_rx *rx)
{
const struct bt_mesh_net_cred *cred;
struct net_buf *buf;
uint8_t transmit;
if (rx->ctx.recv_ttl <= 1U) {
return;
}
if (rx->net_if == BT_MESH_NET_IF_ADV &&
!rx->friend_cred &&
bt_mesh_relay_get() != BT_MESH_RELAY_ENABLED &&
bt_mesh_gatt_proxy_get() != BT_MESH_GATT_PROXY_ENABLED) {
return;
}
BT_DBG("TTL %u CTL %u dst 0x%04x", rx->ctx.recv_ttl, rx->ctl,
rx->ctx.recv_dst);
/* The Relay Retransmit state is only applied to adv-adv relaying.
* Anything else (like GATT to adv, or locally originated packets)
* use the Network Transmit state.
*/
if (rx->net_if == BT_MESH_NET_IF_ADV && !rx->friend_cred) {
transmit = bt_mesh_relay_retransmit_get();
} else {
transmit = bt_mesh_net_transmit_get();
}
buf = bt_mesh_adv_create(BT_MESH_ADV_DATA, BT_MESH_RELAY_ADV,
transmit, K_NO_WAIT);
if (!buf) {
BT_WARN("Out of relay buffers");
return;
}
/* Leave CTL bit intact */
sbuf->data[1] &= 0x80;
sbuf->data[1] |= rx->ctx.recv_ttl - 1U;
net_buf_add_mem(buf, sbuf->data, sbuf->len);
cred = &rx->sub->keys[SUBNET_KEY_TX_IDX(rx->sub)].msg;
BT_DBG("Relaying packet. TTL is now %u", TTL(buf->data));
/* Update NID if RX or RX was with friend credentials */
if (rx->friend_cred) {
buf->data[0] &= 0x80; /* Clear everything except IVI */
buf->data[0] |= cred->nid;
}
/* We re-encrypt and obfuscate using the received IVI rather than
* the normal TX IVI (which may be different) since the transport
* layer nonce includes the IVI.
*/
if (net_encrypt(&buf->b, cred, BT_MESH_NET_IVI_RX(rx), false)) {
BT_ERR("Re-encrypting failed");
goto done;
}
/* When the Friend node relays message for lpn, the message will be
* retransmitted using the managed flooding security credentials and
* the Network PDU shall be retransmitted to all network interfaces.
*/
if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) &&
(rx->friend_cred ||
bt_mesh_gatt_proxy_get() == BT_MESH_GATT_PROXY_ENABLED)) {
bt_mesh_proxy_relay(buf, rx->ctx.recv_dst);
}
if (relay_to_adv(rx->net_if) || rx->friend_cred) {
bt_mesh_adv_send(buf, NULL, NULL);
}
done:
net_buf_unref(buf);
}
void bt_mesh_net_header_parse(struct net_buf_simple *buf,
struct bt_mesh_net_rx *rx)
{
rx->old_iv = (IVI(buf->data) != (bt_mesh.iv_index & 0x01));
rx->ctl = CTL(buf->data);
rx->ctx.recv_ttl = TTL(buf->data);
rx->seq = SEQ(buf->data);
rx->ctx.addr = SRC(buf->data);
rx->ctx.recv_dst = DST(buf->data);
}
int bt_mesh_net_decode(struct net_buf_simple *in, enum bt_mesh_net_if net_if,
struct bt_mesh_net_rx *rx, struct net_buf_simple *out)
{
if (in->len < BT_MESH_NET_MIN_PDU_LEN) {
BT_WARN("Dropping too short mesh packet (len %u)", in->len);
BT_WARN("%s", bt_hex(in->data, in->len));
return -EINVAL;
}
if (in->len > BT_MESH_NET_MAX_PDU_LEN) {
BT_WARN("Dropping too long mesh packet (len %u)", in->len);
return -EINVAL;
}
if (net_if == BT_MESH_NET_IF_ADV && check_dup(in)) {
return -EINVAL;
}
BT_DBG("%u bytes: %s", in->len, bt_hex(in->data, in->len));
rx->net_if = net_if;
if (!bt_mesh_net_cred_find(rx, in, out, net_decrypt)) {
BT_DBG("Unable to find matching net for packet");
return -ENOENT;
}
/* Initialize AppIdx to a sane value */
rx->ctx.app_idx = BT_MESH_KEY_UNUSED;
rx->ctx.recv_ttl = TTL(out->data);
/* Default to responding with TTL 0 for non-routed messages */
if (rx->ctx.recv_ttl == 0U) {
rx->ctx.send_ttl = 0U;
} else {
rx->ctx.send_ttl = BT_MESH_TTL_DEFAULT;
}
rx->ctl = CTL(out->data);
rx->seq = SEQ(out->data);
rx->ctx.recv_dst = DST(out->data);
BT_DBG("Decryption successful. Payload len %u", out->len);
if (net_if != BT_MESH_NET_IF_PROXY_CFG &&
rx->ctx.recv_dst == BT_MESH_ADDR_UNASSIGNED) {
BT_ERR("Destination address is unassigned; dropping packet");
return -EBADMSG;
}
BT_DBG("src 0x%04x dst 0x%04x ttl %u", rx->ctx.addr, rx->ctx.recv_dst,
rx->ctx.recv_ttl);
BT_DBG("PDU: %s", bt_hex(out->data, out->len));
msg_cache_add(rx);
return 0;
}
void bt_mesh_net_recv(struct net_buf_simple *data, int8_t rssi,
enum bt_mesh_net_if net_if)
{
NET_BUF_SIMPLE_DEFINE(buf, BT_MESH_NET_MAX_PDU_LEN);
struct bt_mesh_net_rx rx = { .ctx.recv_rssi = rssi };
struct net_buf_simple_state state;
BT_DBG("rssi %d net_if %u", rssi, net_if);
if (!bt_mesh_is_provisioned()) {
return;
}
if (bt_mesh_net_decode(data, net_if, &rx, &buf)) {
return;
}
/* Save the state so the buffer can later be relayed */
net_buf_simple_save(&buf, &state);
rx.local_match = (bt_mesh_fixed_group_match(rx.ctx.recv_dst) ||
bt_mesh_has_addr(rx.ctx.recv_dst));
if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) &&
net_if == BT_MESH_NET_IF_PROXY) {
bt_mesh_proxy_addr_add(data, rx.ctx.addr);
if (bt_mesh_gatt_proxy_get() == BT_MESH_GATT_PROXY_DISABLED &&
!rx.local_match) {
BT_INFO("Proxy is disabled; ignoring message");
return;
}
}
/* The transport layer has indicated that it has rejected the message,
* but would like to see it again if it is received in the future.
* This can happen if a message is received when the device is in
* Low Power mode, but the message was not encrypted with the friend
* credentials. Remove it from the message cache so that we accept
* it again in the future.
*/
if (bt_mesh_trans_recv(&buf, &rx) == -EAGAIN) {
BT_WARN("Removing rejected message from Network Message Cache");
msg_cache[rx.msg_cache_idx].src = BT_MESH_ADDR_UNASSIGNED;
/* Rewind the next index now that we're not using this entry */
msg_cache_next = rx.msg_cache_idx;
}
/* Relay if this was a group/virtual address, or if the destination
* was neither a local element nor an LPN we're Friends for.
*/
if (!BT_MESH_ADDR_IS_UNICAST(rx.ctx.recv_dst) ||
(!rx.local_match && !rx.friend_match)) {
net_buf_simple_restore(&buf, &state);
bt_mesh_net_relay(&buf, &rx);
}
}
static void ivu_refresh(struct k_work *work)
{
if (!bt_mesh_is_provisioned()) {
return;
}
bt_mesh.ivu_duration = MIN(UINT8_MAX,
bt_mesh.ivu_duration + BT_MESH_IVU_HOURS);
BT_DBG("%s for %u hour%s",
atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS) ?
"IVU in Progress" : "IVU Normal mode",
bt_mesh.ivu_duration, bt_mesh.ivu_duration == 1U ? "" : "s");
if (bt_mesh.ivu_duration < BT_MESH_IVU_MIN_HOURS) {
if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
store_iv(true);
}
goto end;
}
/* Because the beacon may be cached, iv update or iv recovery
* cannot be performed after 96 hours or 192 hours.
* So we need clear beacon cache.
*/
if (!(bt_mesh.ivu_duration % BT_MESH_IVU_MIN_HOURS)) {
bt_mesh_subnet_foreach(bt_mesh_beacon_cache_clear);
}
if (atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS)) {
bt_mesh_beacon_ivu_initiator(true);
bt_mesh_net_iv_update(bt_mesh.iv_index, false);
} else if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
store_iv(true);
}
end:
k_work_reschedule(&bt_mesh.ivu_timer, BT_MESH_IVU_TIMEOUT);
}
void bt_mesh_net_init(void)
{
k_work_init_delayable(&bt_mesh.ivu_timer, ivu_refresh);
k_work_init(&bt_mesh.local_work, bt_mesh_net_local);
}
static int net_set(const char *name, size_t len_rd, settings_read_cb read_cb,
void *cb_arg)
{
struct net_val net;
int err;
if (len_rd == 0) {
BT_DBG("val (null)");
bt_mesh_comp_unprovision();
(void)memset(bt_mesh.dev_key, 0, sizeof(bt_mesh.dev_key));
return 0;
}
err = bt_mesh_settings_set(read_cb, cb_arg, &net, sizeof(net));
if (err) {
BT_ERR("Failed to set \'net\'");
return err;
}
memcpy(bt_mesh.dev_key, net.dev_key, sizeof(bt_mesh.dev_key));
bt_mesh_comp_provision(net.primary_addr);
BT_DBG("Provisioned with primary address 0x%04x", net.primary_addr);
BT_DBG("Recovered DevKey %s", bt_hex(bt_mesh.dev_key, 16));
return 0;
}
BT_MESH_SETTINGS_DEFINE(net, "Net", net_set);
static int iv_set(const char *name, size_t len_rd, settings_read_cb read_cb,
void *cb_arg)
{
struct iv_val iv;
int err;
if (len_rd == 0) {
BT_DBG("IV deleted");
bt_mesh.iv_index = 0U;
atomic_clear_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS);
return 0;
}
err = bt_mesh_settings_set(read_cb, cb_arg, &iv, sizeof(iv));
if (err) {
BT_ERR("Failed to set \'iv\'");
return err;
}
bt_mesh.iv_index = iv.iv_index;
atomic_set_bit_to(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS, iv.iv_update);
bt_mesh.ivu_duration = iv.iv_duration;
BT_DBG("IV Index 0x%04x (IV Update Flag %u) duration %u hours",
iv.iv_index, iv.iv_update, iv.iv_duration);
return 0;
}
BT_MESH_SETTINGS_DEFINE(iv, "IV", iv_set);
static int seq_set(const char *name, size_t len_rd, settings_read_cb read_cb,
void *cb_arg)
{
struct seq_val seq;
int err;
if (len_rd == 0) {
BT_DBG("val (null)");
bt_mesh.seq = 0U;
return 0;
}
err = bt_mesh_settings_set(read_cb, cb_arg, &seq, sizeof(seq));
if (err) {
BT_ERR("Failed to set \'seq\'");
return err;
}
bt_mesh.seq = sys_get_le24(seq.val);
if (CONFIG_BT_MESH_SEQ_STORE_RATE > 0) {
/* Make sure we have a large enough sequence number. We
* subtract 1 so that the first transmission causes a write
* to the settings storage.
*/
bt_mesh.seq += (CONFIG_BT_MESH_SEQ_STORE_RATE -
(bt_mesh.seq % CONFIG_BT_MESH_SEQ_STORE_RATE));
bt_mesh.seq--;
}
BT_DBG("Sequence Number 0x%06x", bt_mesh.seq);
return 0;
}
BT_MESH_SETTINGS_DEFINE(seq, "Seq", seq_set);
static void clear_iv(void)
{
int err;
err = settings_delete("bt/mesh/IV");
if (err) {
BT_ERR("Failed to clear IV");
} else {
BT_DBG("Cleared IV");
}
}
static void store_pending_iv(void)
{
struct iv_val iv;
int err;
iv.iv_index = bt_mesh.iv_index;
iv.iv_update = atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS);
iv.iv_duration = bt_mesh.ivu_duration;
err = settings_save_one("bt/mesh/IV", &iv, sizeof(iv));
if (err) {
BT_ERR("Failed to store IV value");
} else {
BT_DBG("Stored IV value");
}
}
void bt_mesh_net_pending_iv_store(void)
{
if (atomic_test_bit(bt_mesh.flags, BT_MESH_VALID)) {
store_pending_iv();
} else {
clear_iv();
}
}
static void clear_net(void)
{
int err;
err = settings_delete("bt/mesh/Net");
if (err) {
BT_ERR("Failed to clear Network");
} else {
BT_DBG("Cleared Network");
}
}
static void store_pending_net(void)
{
struct net_val net;
int err;
BT_DBG("addr 0x%04x DevKey %s", bt_mesh_primary_addr(),
bt_hex(bt_mesh.dev_key, 16));
net.primary_addr = bt_mesh_primary_addr();
memcpy(net.dev_key, bt_mesh.dev_key, 16);
err = settings_save_one("bt/mesh/Net", &net, sizeof(net));
if (err) {
BT_ERR("Failed to store Network value");
} else {
BT_DBG("Stored Network value");
}
}
void bt_mesh_net_pending_net_store(void)
{
if (atomic_test_bit(bt_mesh.flags, BT_MESH_VALID)) {
store_pending_net();
} else {
clear_net();
}
}
void bt_mesh_net_pending_seq_store(void)
{
struct seq_val seq;
int err;
if (atomic_test_bit(bt_mesh.flags, BT_MESH_VALID)) {
sys_put_le24(bt_mesh.seq, seq.val);
err = settings_save_one("bt/mesh/Seq", &seq, sizeof(seq));
if (err) {
BT_ERR("Failed to stor Seq value");
} else {
BT_DBG("Stored Seq value");
}
} else {
err = settings_delete("bt/mesh/Seq");
if (err) {
BT_ERR("Failed to clear Seq value");
} else {
BT_DBG("Cleared Seq value");
}
}
}
void bt_mesh_net_clear(void)
{
bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_NET_PENDING);
bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_IV_PENDING);
bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_CFG_PENDING);
bt_mesh_settings_store_schedule(BT_MESH_SETTINGS_SEQ_PENDING);
}
void bt_mesh_net_settings_commit(void)
{
if (bt_mesh.ivu_duration < BT_MESH_IVU_MIN_HOURS) {
k_work_reschedule(&bt_mesh.ivu_timer, BT_MESH_IVU_TIMEOUT);
}
}