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/* Bluetooth Mesh */
/*
* SPDX-FileCopyrightText: 2017 Intel Corporation
* SPDX-FileContributor: 2018-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <errno.h>
#include "crypto.h"
#include "tag.h"
#include "adv.h"
#include "mesh.h"
#include "lpn.h"
#include "rpl.h"
#include "friend.h"
#include "access.h"
#include "foundation.h"
#include "settings.h"
#include "transport.h"
#include "mesh/main.h"
#include "fast_prov.h"
#include "mesh/common.h"
#include "mesh/cfg_srv.h"
#include "heartbeat.h"
#if CONFIG_BLE_MESH_V11_SUPPORT
#include "mesh_v1.1/utils.h"
#endif
/* The transport layer needs at least three buffers for itself to avoid
* deadlocks. Ensure that there are a sufficient number of advertising
* buffers available compared to the maximum supported outgoing segment
* count.
*/
_Static_assert(CONFIG_BLE_MESH_ADV_BUF_COUNT >= (CONFIG_BLE_MESH_TX_SEG_MAX + 3),
"Too small BLE Mesh adv buffer count");
#define AID_MASK ((uint8_t)(BIT_MASK(6)))
#define SEG(data) ((data)[0] >> 7)
#define AKF(data) (((data)[0] >> 6) & 0x01)
#define AID(data) ((data)[0] & AID_MASK)
#define ASZMIC(data) (((data)[1] >> 7) & 1)
#define APP_MIC_LEN(aszmic) ((aszmic) ? BLE_MESH_MIC_LONG : BLE_MESH_MIC_SHORT)
#define UNSEG_HDR(akf, aid) ((akf << 6) | (aid & AID_MASK))
#define SEG_HDR(akf, aid) (UNSEG_HDR(akf, aid) | 0x80)
#define BLOCK_COMPLETE(seg_n) (uint32_t)(((uint64_t)1 << (seg_n + 1)) - 1)
#define SEQ_AUTH(iv_index, seq) (((uint64_t)iv_index) << 24 | (uint64_t)seq)
/* Number of retransmit attempts (after the initial transmit) per segment */
#define SEG_RETRANSMIT_ATTEMPTS 4
/* "This timer shall be set to a minimum of 200 + 50 * TTL milliseconds.".
* We use 400 since 300 is a common send duration for standard HCI, and we
* need to have a timeout that's bigger than that.
*/
#define SEG_RETRANSMIT_TIMEOUT_UNICAST(tx) (K_MSEC(400) + 50 * (tx)->ttl)
/* When sending to a group, the messages are not acknowledged, and there's no
* reason to delay the repetitions significantly. Delaying by more than 0 ms
* to avoid flooding the network.
*/
#define SEG_RETRANSMIT_TIMEOUT_GROUP K_MSEC(50)
#define SEG_RETRANSMIT_TIMEOUT(tx) \
(BLE_MESH_ADDR_IS_UNICAST((tx)->dst) ? \
SEG_RETRANSMIT_TIMEOUT_UNICAST(tx) : \
SEG_RETRANSMIT_TIMEOUT_GROUP)
/* How long to wait for available buffers before giving up */
#define BUF_TIMEOUT K_NO_WAIT
static struct seg_tx {
struct bt_mesh_subnet *sub;
struct net_buf *seg[CONFIG_BLE_MESH_TX_SEG_MAX];
uint64_t seq_auth;
uint16_t dst;
uint8_t xmit; /* Segment transmit */
uint8_t seg_n:5, /* Last segment index */
new_key:1; /* New/old key */
uint8_t nack_count; /* Number of unacked segs */
uint8_t ttl;
uint8_t seg_pending; /* Number of segments pending */
uint8_t attempts; /* Transmit attempts */
uint8_t cred; /* Security credentials */
uint8_t tag; /* Additional metadata */
const struct bt_mesh_send_cb *cb;
void *cb_data;
struct k_delayed_work rtx_timer; /* Segment Retransmission timer */
} seg_tx[CONFIG_BLE_MESH_TX_SEG_MSG_COUNT];
static struct seg_rx {
struct bt_mesh_subnet *sub;
uint64_t seq_auth;
uint8_t seg_n:5,
ctl:1,
in_use:1,
obo:1;
uint8_t hdr;
uint8_t ttl;
uint16_t src;
uint16_t dst;
uint32_t block;
uint32_t last;
struct k_delayed_work ack_timer;
struct net_buf_simple buf;
} seg_rx[CONFIG_BLE_MESH_RX_SEG_MSG_COUNT] = {
[0 ... (CONFIG_BLE_MESH_RX_SEG_MSG_COUNT - 1)] = {
.buf.size = CONFIG_BLE_MESH_RX_SDU_MAX,
},
};
static uint8_t seg_rx_buf_data[(CONFIG_BLE_MESH_RX_SEG_MSG_COUNT *
CONFIG_BLE_MESH_RX_SDU_MAX)];
static bt_mesh_mutex_t seg_tx_lock;
static bt_mesh_mutex_t seg_rx_lock;
static inline void bt_mesh_seg_tx_lock(void)
{
bt_mesh_mutex_lock(&seg_tx_lock);
}
static inline void bt_mesh_seg_tx_unlock(void)
{
bt_mesh_mutex_unlock(&seg_tx_lock);
}
static inline void bt_mesh_seg_rx_lock(void)
{
bt_mesh_mutex_lock(&seg_rx_lock);
}
static inline void bt_mesh_seg_rx_unlock(void)
{
bt_mesh_mutex_unlock(&seg_rx_lock);
}
uint8_t bt_mesh_get_seg_rtx_num(void)
{
return SEG_RETRANSMIT_ATTEMPTS;
}
int32_t bt_mesh_get_seg_rtx_timeout(uint16_t dst, uint8_t ttl)
{
/* This function will be used when a client model sending an
* acknowledged message. And if the dst of a message is not
* a unicast address, the function will not be invoked.
* So we can directly use the SEG_RETRANSMIT_TIMEOUT_UNICAST
* macro here.
*/
struct seg_tx tx = {
.ttl = ttl,
};
return SEG_RETRANSMIT_TIMEOUT_UNICAST(&tx);
}
struct bt_mesh_app_key *bt_mesh_app_key_get(uint16_t app_idx)
{
if (bt_mesh_is_provisioned()) {
#if CONFIG_BLE_MESH_NODE
if (!IS_ENABLED(CONFIG_BLE_MESH_FAST_PROV)) {
for (int i = 0; i < ARRAY_SIZE(bt_mesh.app_keys); i++) {
if (bt_mesh.app_keys[i].net_idx != BLE_MESH_KEY_UNUSED &&
bt_mesh.app_keys[i].app_idx == app_idx) {
return &bt_mesh.app_keys[i];
}
}
} else {
return bt_mesh_fast_prov_app_key_find(app_idx);
}
#endif
} else if (bt_mesh_is_provisioner_en()) {
#if CONFIG_BLE_MESH_PROVISIONER
for (int i = 0; i < ARRAY_SIZE(bt_mesh.p_app_keys); i++) {
if (bt_mesh.p_app_keys[i] &&
bt_mesh.p_app_keys[i]->net_idx != BLE_MESH_KEY_UNUSED &&
bt_mesh.p_app_keys[i]->app_idx == app_idx) {
return bt_mesh.p_app_keys[i];
}
}
#endif
}
return NULL;
}
int bt_mesh_upper_key_get(const struct bt_mesh_subnet *subnet, uint16_t app_idx,
const uint8_t **key, uint8_t *aid, uint16_t dst)
{
struct bt_mesh_app_key *app_key = NULL;
if (app_idx == BLE_MESH_KEY_DEV) {
*key = bt_mesh_dev_key_get(dst);
if (!*key) {
BT_ERR("DevKey of 0x%04x not found", dst);
return -EINVAL;
}
*aid = 0U;
return 0;
}
if (!subnet) {
BT_ERR("Invalid subnet");
return -EINVAL;
}
app_key = bt_mesh_app_key_get(app_idx);
if (!app_key) {
BT_ERR("AppKey 0x%04x not found", app_idx);
return -ENOENT;
}
if (subnet->kr_phase == BLE_MESH_KR_PHASE_2 && app_key->updated) {
*key = app_key->keys[1].val;
*aid = app_key->keys[1].id;
} else {
*key = app_key->keys[0].val;
*aid = app_key->keys[0].id;
}
return 0;
}
static int send_unseg(struct bt_mesh_net_tx *tx, struct net_buf_simple *sdu,
const struct bt_mesh_send_cb *cb, void *cb_data,
const uint8_t *ctl_op)
{
struct net_buf *buf = NULL;
BT_DBG("src 0x%04x dst 0x%04x app_idx 0x%04x sdu_len %u",
tx->src, tx->ctx->addr, tx->ctx->app_idx, sdu->len);
buf = bt_mesh_adv_create(BLE_MESH_ADV_DATA, BUF_TIMEOUT);
if (!buf) {
BT_ERR("Out of network buffers");
return -ENOBUFS;
}
net_buf_reserve(buf, BLE_MESH_NET_HDR_LEN);
if (ctl_op) {
net_buf_add_u8(buf, TRANS_CTL_HDR(*ctl_op, 0));
} else if (tx->ctx->app_idx == BLE_MESH_KEY_DEV) {
net_buf_add_u8(buf, UNSEG_HDR(0, 0));
} else {
net_buf_add_u8(buf, UNSEG_HDR(1, tx->aid));
}
net_buf_add_mem(buf, sdu->data, sdu->len);
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND)) {
if (!bt_mesh_friend_queue_has_space(tx->sub->net_idx,
tx->src, tx->ctx->addr,
NULL, 1)) {
if (BLE_MESH_ADDR_IS_UNICAST(tx->ctx->addr)) {
BT_ERR("Not enough space in Friend Queue");
net_buf_unref(buf);
return -ENOBUFS;
}
BT_WARN("No space in Friend Queue");
goto send;
}
if (bt_mesh_friend_enqueue_tx(tx, BLE_MESH_FRIEND_PDU_SINGLE,
NULL, 1, &buf->b) &&
BLE_MESH_ADDR_IS_UNICAST(tx->ctx->addr)) {
/* PDUs for a specific Friend should only go
* out through the Friend Queue.
*/
net_buf_unref(buf);
send_cb_finalize(cb, cb_data);
return 0;
}
}
send:
return bt_mesh_net_send(tx, buf, cb, cb_data);
}
static inline uint8_t seg_len(bool ctl)
{
if (ctl) {
return BLE_MESH_CTL_SEG_SDU_MAX;
}
return BLE_MESH_APP_SEG_SDU_MAX;
}
bool bt_mesh_tx_in_progress(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(seg_tx); i++) {
if (seg_tx[i].nack_count) {
return true;
}
}
return false;
}
static void seg_tx_done(struct seg_tx *tx, uint8_t seg_idx)
{
bt_mesh_adv_buf_ref_debug(__func__, tx->seg[seg_idx], 3U, BLE_MESH_BUF_REF_SMALL);
/**
* When cancelling a segment that is still in the adv sending queue, `tx->seg_pending`
* must else be decremented by one. More detailed information
* can be found in BLEMESH24-26.
*/
if (bt_mesh_atomic_cas(&BLE_MESH_ADV_BUSY(tx->seg[seg_idx]), 1, 0)) {
tx->seg_pending--;
}
net_buf_unref(tx->seg[seg_idx]);
tx->seg[seg_idx] = NULL;
tx->nack_count--;
}
static void seg_tx_reset(struct seg_tx *tx)
{
int i;
bt_mesh_seg_tx_lock();
k_delayed_work_cancel(&tx->rtx_timer);
tx->cb = NULL;
tx->cb_data = NULL;
tx->seq_auth = 0U;
tx->sub = NULL;
tx->dst = BLE_MESH_ADDR_UNASSIGNED;
for (i = 0; i <= tx->seg_n && tx->nack_count; i++) {
if (!tx->seg[i]) {
continue;
}
seg_tx_done(tx, i);
}
tx->nack_count = 0U;
bt_mesh_seg_tx_unlock();
if (bt_mesh_atomic_test_and_clear_bit(bt_mesh.flags, BLE_MESH_IVU_PENDING)) {
BT_DBG("Proceeding with pending IV Update");
/* bt_mesh_net_iv_update() will re-enable the flag if this
* wasn't the only transfer.
*/
if (bt_mesh_net_iv_update(bt_mesh.iv_index, false)) {
bt_mesh_net_sec_update(NULL);
}
}
}
static inline void seg_tx_complete(struct seg_tx *tx, int err)
{
const struct bt_mesh_send_cb *cb = tx->cb;
void *cb_data = tx->cb_data;
seg_tx_reset(tx);
/* TODO: notify the completion of sending segmented message */
if (cb && cb->end) {
cb->end(err, cb_data);
}
}
static void schedule_retransmit(struct seg_tx *tx)
{
if (--tx->seg_pending) {
return;
}
if (!BLE_MESH_ADDR_IS_UNICAST(tx->dst) && !tx->attempts) {
BT_INFO("Complete tx sdu to group");
seg_tx_complete(tx, 0);
return;
}
k_delayed_work_submit(&tx->rtx_timer, SEG_RETRANSMIT_TIMEOUT(tx));
}
static void seg_first_send_start(uint16_t duration, int err, void *user_data)
{
struct seg_tx *tx = user_data;
if (tx->cb && tx->cb->start) {
tx->cb->start(duration, err, tx->cb_data);
}
}
static void seg_send_start(uint16_t duration, int err, void *user_data)
{
struct seg_tx *tx = user_data;
/* If there's an error in transmitting the 'sent' callback will never
* be called. Make sure that we kick the retransmit timer also in this
* case since otherwise we risk the transmission of becoming stale.
*/
if (err) {
schedule_retransmit(tx);
}
}
static void seg_sent(int err, void *user_data)
{
struct seg_tx *tx = user_data;
schedule_retransmit(tx);
}
static const struct bt_mesh_send_cb first_sent_cb = {
.start = seg_first_send_start,
.end = seg_sent,
};
static const struct bt_mesh_send_cb seg_sent_cb = {
.start = seg_send_start,
.end = seg_sent,
};
static void seg_tx_send_unacked(struct seg_tx *tx)
{
int i, err = 0;
bt_mesh_seg_tx_lock();
if (!(tx->attempts--)) {
BT_WARN("Ran out of retransmit attempts");
bt_mesh_seg_tx_unlock();
seg_tx_complete(tx, -ETIMEDOUT);
return;
}
BT_INFO("Attempts: %u", tx->attempts);
for (i = 0; i <= tx->seg_n; i++) {
struct net_buf *seg = tx->seg[i];
if (!seg) {
continue;
}
if (bt_mesh_atomic_get(&BLE_MESH_ADV_BUSY(seg))) {
BT_DBG("Skipping segment that's still advertising");
continue;
}
tx->seg_pending++;
BT_INFO("Resending %u/%u, cred 0x%02x", i, tx->seg_n, tx->cred);
/* TODO:
* tx->new_key should be replaced with sub->kr_flag,
* since there is a chance that the key is refreshed
* during the retransmission of segments.
*/
err = bt_mesh_net_resend(tx->sub, seg, tx->new_key,
&tx->cred, tx->tag,
&seg_sent_cb, tx);
if (err) {
BT_ERR("Sending segment failed");
bt_mesh_seg_tx_unlock();
seg_tx_complete(tx, -EIO);
return;
}
}
bt_mesh_seg_tx_unlock();
}
static void seg_retransmit(struct k_work *work)
{
struct seg_tx *tx = CONTAINER_OF(work, struct seg_tx, rtx_timer);
seg_tx_send_unacked(tx);
}
static int send_seg(struct bt_mesh_net_tx *net_tx, struct net_buf_simple *sdu,
const struct bt_mesh_send_cb *cb, void *cb_data,
const uint8_t *ctl_op)
{
struct seg_tx *tx = NULL;
uint16_t seq_zero = 0U;
uint8_t seg_hdr = 0U;
uint8_t seg_o = 0U;
int i;
BT_DBG("src 0x%04x dst 0x%04x app_idx 0x%04x aszmic %u sdu_len %u",
net_tx->src, net_tx->ctx->addr, net_tx->ctx->app_idx,
net_tx->aszmic, sdu->len);
for (tx = NULL, i = 0; i < ARRAY_SIZE(seg_tx); i++) {
if (!seg_tx[i].nack_count) {
tx = &seg_tx[i];
break;
}
}
if (!tx) {
BT_ERR("No multi-segment message contexts available");
return -EBUSY;
}
if (ctl_op) {
seg_hdr = TRANS_CTL_HDR(*ctl_op, 1);
} else if (net_tx->ctx->app_idx == BLE_MESH_KEY_DEV) {
seg_hdr = SEG_HDR(0, 0);
} else {
seg_hdr = SEG_HDR(1, net_tx->aid);
}
tx->dst = net_tx->ctx->addr;
if (sdu->len) {
tx->seg_n = (sdu->len - 1) / seg_len(!!ctl_op);
} else {
tx->seg_n = 0;
}
tx->nack_count = tx->seg_n + 1;
tx->seq_auth = SEQ_AUTH(BLE_MESH_NET_IVI_TX, bt_mesh.seq);
tx->sub = net_tx->sub;
tx->new_key = net_tx->sub->kr_flag;
tx->attempts = SEG_RETRANSMIT_ATTEMPTS;
tx->seg_pending = 0;
tx->cred = net_tx->ctx->send_cred;
tx->tag = net_tx->ctx->send_tag;
tx->cb = cb;
tx->cb_data = cb_data;
if (net_tx->ctx->send_ttl == BLE_MESH_TTL_DEFAULT) {
tx->ttl = bt_mesh_default_ttl_get();
} else {
tx->ttl = net_tx->ctx->send_ttl;
}
seq_zero = tx->seq_auth & TRANS_SEQ_ZERO_MASK;
BT_DBG("SeqZero 0x%04x", seq_zero);
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) &&
!bt_mesh_friend_queue_has_space(tx->sub->net_idx, net_tx->src,
tx->dst, &tx->seq_auth,
tx->seg_n + 1) &&
BLE_MESH_ADDR_IS_UNICAST(tx->dst)) {
BT_ERR("Not enough space in Friend Queue for %u segments",
tx->seg_n + 1);
seg_tx_reset(tx);
return -ENOBUFS;
}
for (seg_o = 0U; sdu->len; seg_o++) {
struct net_buf *seg = NULL;
uint16_t len = 0U;
int err = 0;
seg = bt_mesh_adv_create(BLE_MESH_ADV_DATA, BUF_TIMEOUT);
if (!seg) {
BT_ERR("Out of segment buffers");
seg_tx_reset(tx);
return -ENOBUFS;
}
net_buf_reserve(seg, BLE_MESH_NET_HDR_LEN);
net_buf_add_u8(seg, seg_hdr);
net_buf_add_u8(seg, (net_tx->aszmic << 7) | seq_zero >> 6);
net_buf_add_u8(seg, (((seq_zero & 0x3f) << 2) | (seg_o >> 3)));
net_buf_add_u8(seg, ((seg_o & 0x07) << 5) | tx->seg_n);
len = MIN(sdu->len, seg_len(!!ctl_op));
net_buf_add_mem(seg, net_buf_simple_pull_mem(sdu, len), len);
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND)) {
enum bt_mesh_friend_pdu_type type = BLE_MESH_FRIEND_PDU_PARTIAL;
if (seg_o == tx->seg_n) {
type = BLE_MESH_FRIEND_PDU_COMPLETE;
} else {
type = BLE_MESH_FRIEND_PDU_PARTIAL;
}
if (bt_mesh_friend_enqueue_tx(net_tx, type,
&tx->seq_auth,
tx->seg_n + 1,
&seg->b) &&
BLE_MESH_ADDR_IS_UNICAST(net_tx->ctx->addr)) {
/* PDUs for a specific Friend should only go
* out through the Friend Queue.
*/
net_buf_unref(seg);
continue;
}
}
tx->seg[seg_o] = net_buf_ref(seg);
BT_DBG("Sending %u/%u", seg_o, tx->seg_n);
tx->seg_pending++;
err = bt_mesh_net_send(net_tx, seg,
seg_o ? &seg_sent_cb : &first_sent_cb,
tx);
if (err) {
BT_ERR("Sending segment failed (err %d)", err);
seg_tx_reset(tx);
return err;
}
/* If security credentials is updated in the network layer,
* need to store the security credentials for the segments,
* which will be used for retransmission later.
*/
if (tx->cred != net_tx->ctx->send_cred) {
tx->cred = net_tx->ctx->send_cred;
}
}
/* This can happen if segments only went into the Friend Queue */
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) && !tx->seg[0]) {
seg_tx_reset(tx);
/* If there was a callback notify sending immediately since
* there's no other way to track this (at least currently)
* with the Friend Queue.
*/
send_cb_finalize(cb, cb_data);
}
if (IS_ENABLED(CONFIG_BLE_MESH_LOW_POWER) &&
bt_mesh_lpn_established()) {
bt_mesh_lpn_poll();
}
return 0;
}
int bt_mesh_trans_send(struct bt_mesh_net_tx *tx, struct net_buf_simple *msg,
const struct bt_mesh_send_cb *cb, void *cb_data)
{
const uint8_t *key = NULL;
uint8_t *ad = NULL;
uint8_t aid = 0U;
int err = 0;
if (msg->len < 1) {
BT_ERR("Zero-length SDU not allowed");
return -EINVAL;
}
if (msg->len > BLE_MESH_SDU_UNSEG_MAX) {
tx->ctx->send_tag |= BLE_MESH_TAG_SEND_SEGMENTED;
}
BT_DBG("net_idx 0x%04x app_idx 0x%04x dst 0x%04x", tx->sub->net_idx,
tx->ctx->app_idx, tx->ctx->addr);
BT_DBG("len %u: %s", msg->len, bt_hex(msg->data, msg->len));
err = bt_mesh_upper_key_get(tx->sub, tx->ctx->app_idx, &key,
&aid, tx->ctx->addr);
if (err) {
return err;
}
tx->aid = aid;
if (!bt_mesh_tag_send_segmented(tx->ctx->send_tag) ||
tx->ctx->send_szmic == BLE_MESH_SEG_SZMIC_SHORT ||
net_buf_simple_tailroom(msg) < BLE_MESH_MIC_LONG) {
tx->aszmic = 0U;
} else {
tx->aszmic = 1U;
}
BT_INFO("%s, send_tag 0x%02x, send_szmic %d, aszmic %d",
bt_mesh_tag_send_segmented(tx->ctx->send_tag) ? "Seg" : "Unseg",
tx->ctx->send_tag, tx->ctx->send_szmic, tx->aszmic);
if (BLE_MESH_ADDR_IS_VIRTUAL(tx->ctx->addr)) {
ad = bt_mesh_label_uuid_get(tx->ctx->addr);
} else {
ad = NULL;
}
err = bt_mesh_app_encrypt(key, tx->ctx->app_idx == BLE_MESH_KEY_DEV,
tx->aszmic, msg, ad, tx->src,
tx->ctx->addr, bt_mesh.seq,
BLE_MESH_NET_IVI_TX);
if (err) {
BT_ERR("Encrypt failed (err %d)", err);
return err;
}
if (bt_mesh_tag_send_segmented(tx->ctx->send_tag)) {
return send_seg(tx, msg, cb, cb_data, NULL);
}
return send_unseg(tx, msg, cb, cb_data, NULL);
}
static void revoke_dev_key(const uint8_t *dev_key)
{
if (!memcmp(dev_key, bt_mesh.dev_key_ca, 16)) {
BT_INFO("Revoke Device Key");
memcpy(bt_mesh.dev_key, bt_mesh.dev_key_ca, 16);
memset(bt_mesh.dev_key_ca, 0, 16);
if (IS_ENABLED(CONFIG_BLE_MESH_SETTINGS)) {
bt_mesh_store_net();
bt_mesh_clear_dkca();
}
}
}
static int sdu_recv(struct bt_mesh_net_rx *rx, uint32_t seq, uint8_t hdr,
uint8_t aszmic, struct net_buf_simple *buf)
{
struct net_buf_simple *sdu = NULL;
size_t array_size = 0U;
uint8_t *ad = NULL;
size_t i = 0U;
int err = 0;
BT_DBG("ASZMIC %u AKF %u AID 0x%02x", aszmic, AKF(&hdr), AID(&hdr));
BT_DBG("len %u: %s", buf->len, bt_hex(buf->data, buf->len));
if (buf->len < 1 + APP_MIC_LEN(aszmic)) {
BT_ERR("Too short SDU + MIC (len %u)", buf->len);
return -EINVAL;
}
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) && !rx->local_match) {
BT_DBG("Ignoring PDU for LPN 0x%04x of this Friend",
rx->ctx.recv_dst);
return 0;
}
if (BLE_MESH_ADDR_IS_VIRTUAL(rx->ctx.recv_dst)) {
ad = bt_mesh_label_uuid_get(rx->ctx.recv_dst);
} else {
ad = NULL;
}
/* Adjust the length to not contain the MIC at the end */
buf->len -= APP_MIC_LEN(aszmic);
/* Use bt_mesh_alloc_buf() instead of NET_BUF_SIMPLE_DEFINE to avoid
* causing btu task stack overflow.
*/
sdu = bt_mesh_alloc_buf(CONFIG_BLE_MESH_RX_SDU_MAX - BLE_MESH_MIC_SHORT);
if (!sdu) {
BT_ERR("%s, Out of memory", __func__);
return -ENOMEM;
}
if (!AKF(&hdr)) {
array_size = bt_mesh_rx_devkey_size();
for (i = 0U; i < array_size; i++) {
const uint8_t *dev_key = NULL;
dev_key = bt_mesh_rx_devkey_get(i, rx->ctx.addr);
if (!dev_key) {
BT_DBG("DevKey not found");
continue;
}
net_buf_simple_reset(sdu);
err = bt_mesh_app_decrypt(dev_key, true, aszmic, buf,
sdu, ad, rx->ctx.addr,
rx->ctx.recv_dst, seq,
BLE_MESH_NET_IVI_RX(rx));
if (err) {
continue;
}
BT_BQB(BLE_MESH_BQB_TEST_LOG_LEVEL_PRIMARY_ID_NODE | \
BLE_MESH_BQB_TEST_LOG_LEVEL_SUB_ID_TNPT,
"\nTNPTRecv: ctl: 0x%04x, ttl: 0x%04x, src: 0x%04x, dst: 0x%04x, payload: 0x%s",
rx->ctl, rx->ctx.recv_ttl, rx->ctx.addr, rx->ctx.recv_dst,
bt_hex(sdu->data, sdu->len));
/* When the Device Key Candidate is available, and an access message
* is decrypted using the Device Key Candidate that was delivered to
* the access layer, then the node shall revoke the device key, the
* Device Key Candidate shall become the device key, and the Device
* Key Candidate shall become unavailable.
*/
revoke_dev_key(dev_key);
rx->ctx.app_idx = BLE_MESH_KEY_DEV;
bt_mesh_model_recv(rx, sdu);
bt_mesh_free_buf(sdu);
return 0;
}
BT_WARN("Unable to decrypt with DevKey");
bt_mesh_free_buf(sdu);
return -ENODEV;
}
array_size = bt_mesh_rx_appkey_size();
for (i = 0U; i < array_size; i++) {
struct bt_mesh_app_keys *keys = NULL;
struct bt_mesh_app_key *key = NULL;
key = bt_mesh_rx_appkey_get(i);
if (!key) {
BT_DBG("AppKey not found");
continue;
}
/* Make sure that this AppKey matches received net_idx */
if (key->net_idx != rx->sub->net_idx) {
continue;
}
if (rx->new_key && key->updated) {
keys = &key->keys[1];
} else {
keys = &key->keys[0];
}
/* Check that the AppKey ID matches */
if (AID(&hdr) != keys->id) {
continue;
}
net_buf_simple_reset(sdu);
err = bt_mesh_app_decrypt(keys->val, false, aszmic, buf,
sdu, ad, rx->ctx.addr,
rx->ctx.recv_dst, seq,
BLE_MESH_NET_IVI_RX(rx));
BT_BQB(BLE_MESH_BQB_TEST_LOG_LEVEL_PRIMARY_ID_NODE | \
BLE_MESH_BQB_TEST_LOG_LEVEL_SUB_ID_TNPT,
"\nTNPTRecv: ctl: 0x%04x, ttl: 0x%04x, src: 0x%04x, dst: 0x%04x, payload: 0x%s",
rx->ctl, rx->ctx.recv_ttl, rx->ctx.addr, rx->ctx.recv_dst,
bt_hex(sdu->data, sdu->len));
if (err) {
BT_DBG("Unable to decrypt with AppKey 0x%03x",
key->app_idx);
continue;
}
rx->ctx.app_idx = key->app_idx;
bt_mesh_model_recv(rx, sdu);
bt_mesh_free_buf(sdu);
return 0;
}
if (rx->local_match) {
BT_WARN("No matching AppKey");
}
bt_mesh_free_buf(sdu);
return 0;
}
static struct seg_tx *seg_tx_lookup(uint16_t seq_zero, uint8_t obo, uint16_t addr)
{
struct seg_tx *tx = NULL;
int i;
for (i = 0; i < ARRAY_SIZE(seg_tx); i++) {
tx = &seg_tx[i];
if ((tx->seq_auth & TRANS_SEQ_ZERO_MASK) != seq_zero) {
continue;
}
if (tx->dst == addr) {
return tx;
}
/* If the expected remote address doesn't match,
* but the OBO flag is set and this is the first
* acknowledgement, assume it's a Friend that's
* responding and therefore accept the message.
*/
if (obo && tx->nack_count == tx->seg_n + 1) {
tx->dst = addr;
return tx;
}
}
return NULL;
}
static int trans_ack(struct bt_mesh_net_rx *rx, uint8_t hdr,
struct net_buf_simple *buf, uint64_t *seq_auth)
{
struct seg_tx *tx = NULL;
unsigned int bit = 0;
uint32_t ack = 0U;
uint16_t seq_zero = 0U;
uint8_t obo = 0U;
if (buf->len != 6) {
BT_ERR("Malformed Segment Ack (len %u)", buf->len);
return -EINVAL;
}
seq_zero = net_buf_simple_pull_be16(buf);
obo = seq_zero >> 15;
seq_zero = (seq_zero >> 2) & TRANS_SEQ_ZERO_MASK;
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) && rx->friend_match) {
BT_DBG("Ack for LPN 0x%04x of this Friend", rx->ctx.recv_dst);
/* Best effort - we don't have enough info for true SeqAuth */
*seq_auth = SEQ_AUTH(BLE_MESH_NET_IVI_RX(rx), seq_zero);
return 0;
}
ack = net_buf_simple_pull_be32(buf);
BT_DBG("OBO %u seq_zero 0x%04x ack 0x%08x", obo, seq_zero, ack);
tx = seg_tx_lookup(seq_zero, obo, rx->ctx.addr);
if (!tx) {
BT_INFO("No matching TX context for Seg Ack");
return -EINVAL;
}
if (!BLE_MESH_ADDR_IS_UNICAST(tx->dst)) {
BT_WARN("Received ack for segments to group");
return -EINVAL;
}
*seq_auth = tx->seq_auth;
if (!ack) {
BT_WARN("SDU canceled");
seg_tx_complete(tx, -ECANCELED);
return 0;
}
if (find_msb_set(ack) - 1 > tx->seg_n) {
BT_ERR("Too large segment number in ack");
return -EINVAL;
}
k_delayed_work_cancel(&tx->rtx_timer);
while ((bit = find_lsb_set(ack))) {
if (tx->seg[bit - 1]) {
BT_INFO("Seg %u/%u acked", bit - 1, tx->seg_n);
bt_mesh_seg_tx_lock();
seg_tx_done(tx, bit - 1);
bt_mesh_seg_tx_unlock();
}
ack &= ~BIT(bit - 1);
}
if (tx->nack_count) {
seg_tx_send_unacked(tx);
} else {
BT_DBG("SDU TX complete");
seg_tx_complete(tx, 0);
}
return 0;
}
static int trans_heartbeat(struct bt_mesh_net_rx *rx,
struct net_buf_simple *buf)
{
uint8_t init_ttl = 0U, hops = 0U;
uint16_t feat = 0U;
if (buf->len != 3) {
BT_ERR("Malformed heartbeat message (len %u)", buf->len);
return -EINVAL;
}
if (IS_ENABLED(CONFIG_BLE_MESH_NODE) && bt_mesh_is_provisioned() &&
rx->ctx.recv_dst != bt_mesh_get_hb_sub_dst()) {
BT_WARN("Ignoring heartbeat to non-subscribed destination");
return 0;
}
init_ttl = (net_buf_simple_pull_u8(buf) & 0x7f);
feat = net_buf_simple_pull_be16(buf);
hops = (init_ttl - rx->ctx.recv_ttl + 1);
BT_INFO("src 0x%04x TTL %u InitTTL %u (%u hop%s) feat 0x%04x",
rx->ctx.addr, rx->ctx.recv_ttl, init_ttl, hops,
(hops == 1U) ? "" : "s", feat);
if (IS_ENABLED(CONFIG_BLE_MESH_NODE) && bt_mesh_is_provisioned()) {
bt_mesh_heartbeat_recv(rx->ctx.addr, rx->ctx.recv_dst, hops, feat);
} else if (IS_ENABLED(CONFIG_BLE_MESH_PROVISIONER_RECV_HB) && bt_mesh_is_provisioner_en()) {
bt_mesh_pvnr_heartbeat_recv(rx->ctx.addr, rx->ctx.recv_dst,
init_ttl, rx->ctx.recv_ttl,
hops, feat, rx->ctx.recv_rssi);
}
return 0;
}
static int ctl_recv(struct bt_mesh_net_rx *rx, uint8_t hdr,
struct net_buf_simple *buf, uint64_t *seq_auth)
{
uint8_t ctl_op = TRANS_CTL_OP(&hdr);
BT_DBG("OpCode 0x%02x len %u", ctl_op, buf->len);
BT_BQB(BLE_MESH_BQB_TEST_LOG_LEVEL_PRIMARY_ID_NODE | \
BLE_MESH_BQB_TEST_LOG_LEVEL_SUB_ID_TNPT,
"\nTNPTRecv: ctl: 0x%04x, ttl: 0x%04x, src: 0x%04x, dst: 0x%04x, payload: 0x%s",
rx->ctl, rx->ctx.recv_ttl, rx->ctx.addr, rx->ctx.recv_dst,
bt_hex(buf->data, buf->len));
switch (ctl_op) {
case TRANS_CTL_OP_ACK:
return trans_ack(rx, hdr, buf, seq_auth);
case TRANS_CTL_OP_HEARTBEAT:
return trans_heartbeat(rx, buf);
}
/* Only acks and heartbeats may need processing without local_match */
if (!rx->local_match) {
return 0;
}
#if CONFIG_BLE_MESH_DF_SRV
switch (ctl_op) {
case TRANS_CTL_OP_PATH_REQ:
case TRANS_CTL_OP_PATH_REPLY:
case TRANS_CTL_OP_PATH_CFM:
case TRANS_CTL_OP_PATH_ECHO_REQ:
case TRANS_CTL_OP_PATH_ECHO_REPLY:
case TRANS_CTL_OP_DEP_NODE_UPDATE:
case TRANS_CTL_OP_PATH_REQ_SOLIC:
return bt_mesh_directed_forwarding_ctl_recv(ctl_op, rx, buf);
}
#endif
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) && !bt_mesh_lpn_established()) {
switch (ctl_op) {
case TRANS_CTL_OP_FRIEND_POLL:
return bt_mesh_friend_poll(rx, buf);
case TRANS_CTL_OP_FRIEND_REQ:
return bt_mesh_friend_req(rx, buf);
case TRANS_CTL_OP_FRIEND_CLEAR:
return bt_mesh_friend_clear(rx, buf);
case TRANS_CTL_OP_FRIEND_CLEAR_CFM:
return bt_mesh_friend_clear_cfm(rx, buf);
case TRANS_CTL_OP_FRIEND_SUB_ADD:
return bt_mesh_friend_sub_add(rx, buf);
case TRANS_CTL_OP_FRIEND_SUB_REM:
return bt_mesh_friend_sub_rem(rx, buf);
}
}
#if CONFIG_BLE_MESH_LOW_POWER
if (ctl_op == TRANS_CTL_OP_FRIEND_OFFER) {
return bt_mesh_lpn_friend_offer(rx, buf);
}
if (rx->ctx.addr == bt_mesh.lpn.frnd) {
if (ctl_op == TRANS_CTL_OP_FRIEND_CLEAR_CFM) {
return bt_mesh_lpn_friend_clear_cfm(rx, buf);
}
if (rx->ctx.recv_cred != BLE_MESH_FRIENDSHIP_CRED) {
BT_WARN("Message from friend with wrong credentials");
return -EINVAL;
}
switch (ctl_op) {
case TRANS_CTL_OP_FRIEND_UPDATE:
return bt_mesh_lpn_friend_update(rx, buf);
case TRANS_CTL_OP_FRIEND_SUB_CFM:
return bt_mesh_lpn_friend_sub_cfm(rx, buf);
}
}
#endif /* CONFIG_BLE_MESH_LOW_POWER */
BT_WARN("Unhandled TransOpCode 0x%02x", ctl_op);
return -ENOENT;
}
static int trans_unseg(struct net_buf_simple *buf, struct bt_mesh_net_rx *rx,
uint64_t *seq_auth)
{
uint8_t hdr = 0U;
BT_DBG("AFK %u AID 0x%02x", AKF(buf->data), AID(buf->data));
if (buf->len < 1) {
BT_ERR("Too small unsegmented PDU");
return -EINVAL;
}
if (bt_mesh_rpl_check(rx, NULL)) {
BT_WARN("Replay: src 0x%04x dst 0x%04x seq 0x%06x",
rx->ctx.addr, rx->ctx.recv_dst, rx->seq);
return -EINVAL;
}
hdr = net_buf_simple_pull_u8(buf);
if (rx->ctl) {
return ctl_recv(rx, hdr, buf, seq_auth);
}
/* SDUs must match a local element or an LPN of this Friend. */
if (!rx->local_match && !rx->friend_match) {
return 0;
}
return sdu_recv(rx, rx->seq, hdr, 0, buf);
}
static inline int32_t ack_timeout(struct seg_rx *rx)
{
int32_t to = 0;
uint8_t ttl = 0U;
if (rx->ttl == BLE_MESH_TTL_DEFAULT) {
ttl = bt_mesh_default_ttl_get();
} else {
ttl = rx->ttl;
}
/* The acknowledgment timer shall be set to a minimum of
* 150 + 50 * TTL milliseconds.
*/
to = K_MSEC(150 + (ttl * 50U));
/* 100 ms for every not yet received segment */
to += K_MSEC(((rx->seg_n + 1) - popcount(rx->block)) * 100U);
/* Make sure we don't send more frequently than the duration for
* each packet (default is 300ms).
*/
return MAX(to, K_MSEC(400));
}
int bt_mesh_ctl_send(struct bt_mesh_net_tx *tx, uint8_t ctl_op, void *data,
size_t data_len, const struct bt_mesh_send_cb *cb,
void *cb_data)
{
struct net_buf_simple buf = {0};
net_buf_simple_init_with_data(&buf, data, data_len);
if (data_len > BLE_MESH_SDU_UNSEG_MAX) {
tx->ctx->send_tag |= BLE_MESH_TAG_SEND_SEGMENTED;
}
/* Set app_idx to unused here since CTL is only encrypted with NetKey */
tx->ctx->app_idx = BLE_MESH_KEY_UNUSED;
BT_DBG("src 0x%04x dst 0x%04x ttl 0x%02x ctl 0x%02x", tx->src,
tx->ctx->addr, tx->ctx->send_ttl, ctl_op);
BT_DBG("len %zu: %s", data_len, bt_hex(data, data_len));
if (bt_mesh_tag_send_segmented(tx->ctx->send_tag)) {
return send_seg(tx, &buf, cb, cb_data, &ctl_op);
}
return send_unseg(tx, &buf, cb, cb_data, &ctl_op);
}
static int send_ack(struct bt_mesh_subnet *sub, uint16_t src, uint16_t dst,
uint8_t ttl, uint64_t *seq_auth, uint32_t block, uint8_t obo)
{
struct bt_mesh_msg_ctx ctx = {
.net_idx = sub->net_idx,
.app_idx = BLE_MESH_KEY_UNUSED,
.addr = dst,
.send_ttl = ttl,
/* TODO:
* Could be Managed flooding/Friendship/Directed security credentials.
* The "recv_cred" could be used to initialize "send_cred".
*/
.send_cred = BLE_MESH_FLOODING_CRED,
};
struct bt_mesh_net_tx tx = {
.sub = sub,
.ctx = &ctx,
.src = obo ? bt_mesh_primary_addr() : src,
.xmit = bt_mesh_net_transmit_get(),
};
uint16_t seq_zero = *seq_auth & TRANS_SEQ_ZERO_MASK;
uint8_t buf[6] = {0};
BT_DBG("SeqZero 0x%04x Block 0x%08x OBO %u", seq_zero, block, obo);
if (bt_mesh_lpn_established()) {
BT_WARN("Not sending ack when LPN is enabled");
return 0;
}
/* This can happen if the segmented message was destined for a group
* or virtual address.
*/
if (!BLE_MESH_ADDR_IS_UNICAST(src)) {
BT_INFO("Not sending ack for non-unicast address");
return 0;
}
sys_put_be16(((seq_zero << 2) & 0x7ffc) | (obo << 15), buf);
sys_put_be32(block, &buf[2]);
return bt_mesh_ctl_send(&tx, TRANS_CTL_OP_ACK, buf, sizeof(buf),
NULL, NULL);
}
static void seg_rx_reset(struct seg_rx *rx, bool full_reset)
{
bt_mesh_seg_rx_lock();
k_delayed_work_cancel(&rx->ack_timer);
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) && rx->obo &&
rx->block != BLOCK_COMPLETE(rx->seg_n)) {
BT_WARN("Clearing incomplete buffers from Friend queue");
bt_mesh_friend_clear_incomplete(rx->sub, rx->src, rx->dst,
&rx->seq_auth);
}
rx->in_use = 0U;
/* We don't always reset these values since we need to be able to
* send an ack if we receive a segment after we've already received
* the full SDU.
*/
if (full_reset) {
rx->seq_auth = 0U;
rx->sub = NULL;
rx->src = BLE_MESH_ADDR_UNASSIGNED;
rx->dst = BLE_MESH_ADDR_UNASSIGNED;
}
bt_mesh_seg_rx_unlock();
}
static uint32_t incomplete_timeout(struct seg_rx *rx)
{
uint32_t timeout = 0U;
uint8_t ttl = 0U;
if (rx->ttl == BLE_MESH_TTL_DEFAULT) {
ttl = bt_mesh_default_ttl_get();
} else {
ttl = rx->ttl;
}
/* "The incomplete timer shall be set to a minimum of 10 seconds." */
timeout = K_SECONDS(10);
/* The less segments being received, the shorter timeout will be used. */
timeout += K_MSEC(ttl * popcount(rx->block) * 100U);
return MIN(timeout, K_SECONDS(60));
}
static void seg_ack(struct k_work *work)
{
struct seg_rx *rx = CONTAINER_OF(work, struct seg_rx, ack_timer);
bt_mesh_seg_rx_lock();
if (k_uptime_get_32() - rx->last > incomplete_timeout(rx)) {
BT_WARN("Incomplete timer expired");
bt_mesh_seg_rx_unlock();
seg_rx_reset(rx, false);
return;
}
/* Add this check in case the timeout handler is just executed
* after the seg_rx_reset() which may reset rx->sub to NULL.
*/
if (rx->sub == NULL) {
bt_mesh_seg_rx_unlock();
return;
}
send_ack(rx->sub, rx->dst, rx->src, rx->ttl, &rx->seq_auth,
rx->block, rx->obo);
k_delayed_work_submit(&rx->ack_timer, ack_timeout(rx));
bt_mesh_seg_rx_unlock();
}
static inline bool sdu_len_is_ok(bool ctl, uint8_t seg_n)
{
return ((seg_n + 1) * seg_len(ctl) <= CONFIG_BLE_MESH_RX_SDU_MAX);
}
static struct seg_rx *seg_rx_find(struct bt_mesh_net_rx *net_rx,
const uint64_t *seq_auth)
{
int i;
for (i = 0; i < ARRAY_SIZE(seg_rx); i++) {
struct seg_rx *rx = &seg_rx[i];
if (rx->src != net_rx->ctx.addr ||
rx->dst != net_rx->ctx.recv_dst) {
continue;
}
/* When ">=" is used, return newer RX context in addition to an exact match,
* so the calling function can properly discard an old SeqAuth.
*/
#if CONFIG_BLE_MESH_DISCARD_OLD_SEQ_AUTH
if (rx->seq_auth >= *seq_auth) {
#else
if (rx->seq_auth == *seq_auth) {
#endif
return rx;
}
if (rx->in_use) {
BT_WARN("Duplicate SDU from src 0x%04x", net_rx->ctx.addr);
/* Clear out the old context since the sender
* has apparently started sending a new SDU.
*/
seg_rx_reset(rx, true);
/* Return non-match so caller can re-allocate */
return NULL;
}
}
return NULL;
}
static bool seg_rx_is_valid(struct seg_rx *rx, struct bt_mesh_net_rx *net_rx,
const uint8_t *hdr, uint8_t seg_n)
{
if (rx->hdr != *hdr || rx->seg_n != seg_n) {
BT_ERR("Invalid segment for ongoing session");
return false;
}
if (rx->src != net_rx->ctx.addr || rx->dst != net_rx->ctx.recv_dst) {
BT_ERR("Invalid source or destination for segment");
return false;
}
if (rx->ctl != net_rx->ctl) {
BT_ERR("Inconsistent CTL in segment");
return false;
}
return true;
}
static struct seg_rx *seg_rx_alloc(struct bt_mesh_net_rx *net_rx,
const uint8_t *hdr, const uint64_t *seq_auth,
uint8_t seg_n)
{
int i;
for (i = 0; i < ARRAY_SIZE(seg_rx); i++) {
struct seg_rx *rx = &seg_rx[i];
if (rx->in_use) {
continue;
}
rx->in_use = 1U;
net_buf_simple_reset(&rx->buf);
rx->sub = net_rx->sub;
rx->ctl = net_rx->ctl;
rx->seq_auth = *seq_auth;
rx->seg_n = seg_n;
rx->hdr = *hdr;
rx->ttl = net_rx->ctx.send_ttl;
rx->src = net_rx->ctx.addr;
rx->dst = net_rx->ctx.recv_dst;
rx->block = 0U;
BT_DBG("New RX context. Block Complete 0x%08x",
BLOCK_COMPLETE(seg_n));
return rx;
}
return NULL;
}
static int trans_seg(struct net_buf_simple *buf, struct bt_mesh_net_rx *net_rx,
enum bt_mesh_friend_pdu_type *pdu_type, uint64_t *seq_auth,
uint8_t *seg_count)
{
struct bt_mesh_rpl *rpl = NULL;
struct seg_rx *rx = NULL;
uint8_t *hdr = buf->data;
uint16_t seq_zero = 0U;
uint8_t seg_n = 0U;
uint8_t seg_o = 0U;
int err = 0;
if (buf->len < 5) {
BT_ERR("Too short segmented message (len %u)", buf->len);
return -EINVAL;
}
if (bt_mesh_rpl_check(net_rx, &rpl)) {
BT_WARN("Replay: src 0x%04x dst 0x%04x seq 0x%06x",
net_rx->ctx.addr, net_rx->ctx.recv_dst, net_rx->seq);
return -EINVAL;
}
BT_DBG("ASZMIC %u AKF %u AID 0x%02x", ASZMIC(hdr), AKF(hdr), AID(hdr));
net_buf_simple_pull(buf, 1);
seq_zero = net_buf_simple_pull_be16(buf);
seg_o = (seq_zero & 0x03) << 3;
seq_zero = (seq_zero >> 2) & TRANS_SEQ_ZERO_MASK;
seg_n = net_buf_simple_pull_u8(buf);
seg_o |= seg_n >> 5;
seg_n &= 0x1f;
BT_DBG("SeqZero 0x%04x SegO %u SegN %u", seq_zero, seg_o, seg_n);
if (seg_o > seg_n) {
BT_ERR("SegO greater than SegN (%u > %u)", seg_o, seg_n);
return -EINVAL;
}
/* According to Mesh 1.0 specification:
* "The SeqAuth is composed of the IV Index and the sequence number
* (SEQ) of the first segment"
*
* Therefore we need to calculate very first SEQ in order to find
* seqAuth. We can calculate as below:
*
* SEQ(0) = SEQ(n) - (delta between seqZero and SEQ(n) by looking into
* 14 least significant bits of SEQ(n))
*
* Mentioned delta shall be >= 0, if it is not then seq_auth will
* be broken and it will be verified by the code below.
*/
*seq_auth = SEQ_AUTH(BLE_MESH_NET_IVI_RX(net_rx),
(net_rx->seq -
((((net_rx->seq & BIT_MASK(14)) - seq_zero)) & BIT_MASK(13))));
*seg_count = seg_n + 1;
/* Look for old RX sessions */
rx = seg_rx_find(net_rx, seq_auth);
if (rx) {
/* Discard old SeqAuth packet */
if (rx->seq_auth > *seq_auth) {
BT_WARN("Ignoring old SeqAuth, src 0x%04x, dst 0x%04x",
rx->src, rx->dst);
return -EINVAL;
}
if (!seg_rx_is_valid(rx, net_rx, hdr, seg_n)) {
return -EINVAL;
}
if (rx->in_use) {
BT_DBG("Existing RX context. Block 0x%08x", rx->block);
goto found_rx;
}
if (rx->block == BLOCK_COMPLETE(rx->seg_n)) {
BT_INFO("Got segment for already complete SDU");
send_ack(net_rx->sub, net_rx->ctx.recv_dst,
net_rx->ctx.addr, net_rx->ctx.send_ttl,
seq_auth, rx->block, rx->obo);
if (rpl) {
bt_mesh_update_rpl(rpl, net_rx);
}
return -EALREADY;
}
/* We ignore instead of sending block ack 0 since the
* ack timer is always smaller than the incomplete
* timer, i.e. the sender is misbehaving.
*/
BT_WARN("Got segment for canceled SDU");
return -EINVAL;
}
/* Bail out early if we're not ready to receive such a large SDU */
if (!sdu_len_is_ok(net_rx->ctl, seg_n)) {
BT_ERR("Too big incoming SDU length");
send_ack(net_rx->sub, net_rx->ctx.recv_dst, net_rx->ctx.addr,
net_rx->ctx.send_ttl, seq_auth, 0,
net_rx->friend_match);
return -EMSGSIZE;
}
/* Verify early that there will be space in the Friend Queue(s) in
* case this message is destined to an LPN of ours.
*/
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) &&
net_rx->friend_match && !net_rx->local_match &&
!bt_mesh_friend_queue_has_space(net_rx->sub->net_idx,
net_rx->ctx.addr,
net_rx->ctx.recv_dst, seq_auth,
*seg_count)) {
BT_ERR("No space in Friend Queue for %u segments", *seg_count);
send_ack(net_rx->sub, net_rx->ctx.recv_dst, net_rx->ctx.addr,
net_rx->ctx.send_ttl, seq_auth, 0,
net_rx->friend_match);
return -ENOBUFS;
}
/* Look for free slot for a new RX session */
rx = seg_rx_alloc(net_rx, hdr, seq_auth, seg_n);
if (!rx) {
/* Warn but don't cancel since the existing slots will
* eventually be freed up and we'll be able to process
* this one.
*/
BT_WARN("No free slots for new incoming segmented messages");
return -ENOMEM;
}
rx->obo = net_rx->friend_match;
found_rx:
if (BIT(seg_o) & rx->block) {
BT_INFO("Received already received fragment");
return -EALREADY;
}
/* All segments, except the last one, must either have 8 bytes of
* payload (for 64bit Net MIC) or 12 bytes of payload (for 32bit
* Net MIC).
*/
if (seg_o == seg_n) {
/* Set the expected final buffer length */
rx->buf.len = seg_n * seg_len(rx->ctl) + buf->len;
BT_DBG("Target len %u * %u + %u = %u", seg_n, seg_len(rx->ctl),
buf->len, rx->buf.len);
if (rx->buf.len > CONFIG_BLE_MESH_RX_SDU_MAX) {
BT_ERR("Too large SDU len");
send_ack(net_rx->sub, net_rx->ctx.recv_dst,
net_rx->ctx.addr, net_rx->ctx.send_ttl,
seq_auth, 0, rx->obo);
seg_rx_reset(rx, true);
return -EMSGSIZE;
}
} else {
if (buf->len != seg_len(rx->ctl)) {
BT_ERR("Incorrect segment size for message type");
return -EINVAL;
}
}
/* Reset the Incomplete Timer */
rx->last = k_uptime_get_32();
if (!k_delayed_work_remaining_get(&rx->ack_timer) &&
!bt_mesh_lpn_established()) {
k_delayed_work_submit(&rx->ack_timer, ack_timeout(rx));
}
/* Location in buffer can be calculated based on seg_o & rx->ctl */
memcpy(rx->buf.data + (seg_o * seg_len(rx->ctl)), buf->data, buf->len);
BT_INFO("Seg %u/%u received", seg_o, seg_n);
/* Mark segment as received */
rx->block |= BIT(seg_o);
if (rx->block != BLOCK_COMPLETE(seg_n)) {
*pdu_type = BLE_MESH_FRIEND_PDU_PARTIAL;
return 0;
}
BT_DBG("Complete SDU");
if (rpl) {
bt_mesh_update_rpl(rpl, net_rx);
}
*pdu_type = BLE_MESH_FRIEND_PDU_COMPLETE;
k_delayed_work_cancel(&rx->ack_timer);
send_ack(net_rx->sub, net_rx->ctx.recv_dst, net_rx->ctx.addr,
net_rx->ctx.send_ttl, seq_auth, rx->block, rx->obo);
if (net_rx->ctl) {
err = ctl_recv(net_rx, *hdr, &rx->buf, seq_auth);
} else {
err = sdu_recv(net_rx, (rx->seq_auth & 0xffffff), *hdr,
ASZMIC(hdr), &rx->buf);
}
seg_rx_reset(rx, false);
return err;
}
int bt_mesh_trans_recv(struct net_buf_simple *buf, struct bt_mesh_net_rx *rx)
{
uint64_t seq_auth = TRANS_SEQ_AUTH_NVAL;
enum bt_mesh_friend_pdu_type pdu_type = BLE_MESH_FRIEND_PDU_SINGLE;
struct net_buf_simple_state state = {0};
uint8_t seg_count = 0U;
int err = 0;
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND)) {
rx->friend_match = bt_mesh_friend_match(rx->sub->net_idx,
rx->ctx.recv_dst);
} else {
rx->friend_match = false;
}
BT_DBG("src 0x%04x dst 0x%04x seq 0x%08x friend_match %u",
rx->ctx.addr, rx->ctx.recv_dst, rx->seq, rx->friend_match);
/* Remove network headers */
net_buf_simple_pull(buf, BLE_MESH_NET_HDR_LEN);
BT_DBG("Payload %s", bt_hex(buf->data, buf->len));
/* If LPN mode is enabled messages are only accepted when we've
* requested the Friend to send them. The messages must also
* be encrypted using the Friend Credentials.
*/
if (IS_ENABLED(CONFIG_BLE_MESH_LOW_POWER) &&
bt_mesh_lpn_established() && rx->net_if == BLE_MESH_NET_IF_ADV &&
(!bt_mesh_lpn_waiting_update() ||
rx->ctx.recv_cred != BLE_MESH_FRIENDSHIP_CRED)) {
BT_WARN("Ignoring unexpected message in Low Power mode");
return -EAGAIN;
}
/* Save the app-level state so the buffer can later be placed in
* the Friend Queue.
*/
net_buf_simple_save(buf, &state);
if (SEG(buf->data)) {
/* Segmented messages must match a local element or an
* LPN of this Friend.
*/
if (!rx->local_match && !rx->friend_match) {
return 0;
}
err = trans_seg(buf, rx, &pdu_type, &seq_auth, &seg_count);
} else {
seg_count = 1U;
err = trans_unseg(buf, rx, &seq_auth);
}
/* Notify LPN state machine so a Friend Poll will be sent. If the
* message was a Friend Update it's possible that a Poll was already
* queued for sending, however that's fine since then the
* bt_mesh_lpn_waiting_update() function will return false:
* we still need to go through the actual sending to the bearer and
* wait for ReceiveDelay before transitioning to WAIT_UPDATE state.
* Another situation where we want to notify the LPN state machine
* is if it's configured to use an automatic Friendship establishment
* timer, in which case we want to reset the timer at this point.
*
*/
if (IS_ENABLED(CONFIG_BLE_MESH_LOW_POWER) &&
(bt_mesh_lpn_timer() ||
(bt_mesh_lpn_established() && bt_mesh_lpn_waiting_update()))) {
bt_mesh_lpn_msg_received(rx);
}
net_buf_simple_restore(buf, &state);
if (IS_ENABLED(CONFIG_BLE_MESH_FRIEND) && rx->friend_match && !err) {
if (seq_auth == TRANS_SEQ_AUTH_NVAL) {
bt_mesh_friend_enqueue_rx(rx, pdu_type, NULL,
seg_count, buf);
} else {
bt_mesh_friend_enqueue_rx(rx, pdu_type, &seq_auth,
seg_count, buf);
}
}
return err;
}
void bt_mesh_rx_reset(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(seg_rx); i++) {
seg_rx_reset(&seg_rx[i], true);
}
}
void bt_mesh_tx_reset(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(seg_tx); i++) {
seg_tx_reset(&seg_tx[i]);
}
}
void bt_mesh_rx_reset_single(uint16_t src)
{
int i;
if (!BLE_MESH_ADDR_IS_UNICAST(src)) {
return;
}
for (i = 0; i < ARRAY_SIZE(seg_rx); i++) {
struct seg_rx *rx = &seg_rx[i];
if (src == rx->src) {
seg_rx_reset(rx, true);
}
}
}
void bt_mesh_tx_reset_single(uint16_t dst)
{
int i;
if (!BLE_MESH_ADDR_IS_UNICAST(dst)) {
return;
}
for (i = 0; i < ARRAY_SIZE(seg_tx); i++) {
struct seg_tx *tx = &seg_tx[i];
if (dst == tx->dst) {
seg_tx_reset(tx);
}
}
}
void bt_mesh_trans_init(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(seg_tx); i++) {
k_delayed_work_init(&seg_tx[i].rtx_timer, seg_retransmit);
}
for (i = 0; i < ARRAY_SIZE(seg_rx); i++) {
k_delayed_work_init(&seg_rx[i].ack_timer, seg_ack);
seg_rx[i].buf.__buf = (seg_rx_buf_data +
(i * CONFIG_BLE_MESH_RX_SDU_MAX));
seg_rx[i].buf.data = seg_rx[i].buf.__buf;
}
bt_mesh_mutex_create(&seg_tx_lock);
bt_mesh_mutex_create(&seg_rx_lock);
}
#if CONFIG_BLE_MESH_DEINIT
void bt_mesh_trans_deinit(bool erase)
{
int i;
bt_mesh_rx_reset();
bt_mesh_tx_reset();
bt_mesh_rpl_reset(erase);
for (i = 0; i < ARRAY_SIZE(seg_tx); i++) {
k_delayed_work_free(&seg_tx[i].rtx_timer);
}
for (i = 0; i < ARRAY_SIZE(seg_rx); i++) {
k_delayed_work_free(&seg_rx[i].ack_timer);
}
bt_mesh_mutex_free(&seg_tx_lock);
bt_mesh_mutex_free(&seg_rx_lock);
}
#endif /* CONFIG_BLE_MESH_DEINIT */
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