| /* Bluetooth Mesh */ |
| |
| /* |
| * Copyright (c) 2017 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include "syscfg/syscfg.h" |
| #define MESH_LOG_MODULE BLE_MESH_NET_LOG |
| |
| #include <string.h> |
| #include <errno.h> |
| #include <stdbool.h> |
| |
| #include "os/os_mbuf.h" |
| #include "mesh/mesh.h" |
| |
| #include "crypto.h" |
| #include "adv.h" |
| #include "mesh_priv.h" |
| #include "net.h" |
| #include "rpl.h" |
| #include "lpn.h" |
| #include "friend.h" |
| #include "proxy.h" |
| #include "transport.h" |
| #include "access.h" |
| #include "foundation.h" |
| #include "beacon.h" |
| #include "settings.h" |
| #include "prov.h" |
| #include "mesh/glue.h" |
| #include "mesh/slist.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 BT_MESH_NET_MIN_PDU_LEN (BT_MESH_NET_HDR_LEN + 1 + 8) |
| |
| #define LOOPBACK_MAX_PDU_LEN (BT_MESH_NET_HDR_LEN + 16) |
| #define LOOPBACK_USER_DATA_SIZE sizeof(struct bt_mesh_subnet *) |
| #define LOOPBACK_BUF_SUB(buf) (*(struct bt_mesh_subnet **)net_buf_user_data(buf)) |
| |
| /* 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) (sys_get_be24(&pdu[2])) |
| #define SRC(pdu) (sys_get_be16(&(pdu)[5])) |
| #define DST(pdu) (sys_get_be16(&(pdu)[7])) |
| |
| static struct { |
| uint32_t src : 15, /* MSb of source is always 0 */ |
| seq : 17; |
| } msg_cache[MYNEWT_VAL(BLE_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 = STAILQ_HEAD_INITIALIZER(bt_mesh.local_queue), |
| }; |
| |
| static struct os_mempool loopback_buf_pool_mem; |
| static struct os_mbuf_pool loopback_buf_pool; |
| |
| static uint32_t dup_cache[MYNEWT_VAL(BLE_MESH_MSG_CACHE_SIZE)]; |
| static int dup_cache_next; |
| |
| static bool check_dup(struct os_mbuf *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 os_mbuf *pdu) |
| { |
| uint16_t i; |
| |
| for (i = 0; i < ARRAY_SIZE(msg_cache); i++) { |
| if (msg_cache[i].src == SRC(pdu->om_data) && |
| msg_cache[i].seq == (SEQ(pdu->om_data) & BIT_MASK(17))) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| static void msg_cache_add(struct bt_mesh_net_rx *rx) |
| { |
| /* Add to the cache */ |
| 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); |
| } |
| |
| 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)); |
| |
| /* 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 = BT_MESH_IVU_MIN_HOURS; |
| |
| if (IS_ENABLED(CONFIG_BT_SETTINGS)) { |
| BT_DBG("Storing network information persistently"); |
| bt_mesh_store_net(); |
| bt_mesh_store_subnet(idx); |
| bt_mesh_store_iv(false); |
| } |
| |
| return 0; |
| } |
| |
| #if MYNEWT_VAL(BLE_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 = 0; |
| } |
| |
| 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 */ |
| |
| 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) { |
| BT_WARN("IV Index mismatch: 0x%08x != 0x%08x", |
| (unsigned) iv_index, |
| (unsigned) 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", |
| (unsigned) iv_index, |
| (unsigned) bt_mesh.iv_index); |
| return false; |
| } |
| |
| if (iv_index > bt_mesh.iv_index + 1) { |
| BT_WARN("Performing IV Index Recovery"); |
| bt_mesh_rpl_clear(); |
| bt_mesh.iv_index = iv_index; |
| bt_mesh.seq = 0; |
| 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_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; |
| } |
| |
| do_update: |
| atomic_set_bit_to(bt_mesh.flags, BT_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", |
| (unsigned) bt_mesh.iv_index); |
| |
| bt_mesh_rpl_reset(); |
| } else { |
| BT_DBG("Normal mode entered"); |
| bt_mesh.seq = 0; |
| } |
| |
| k_delayed_work_submit(&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); |
| } |
| |
| if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) && |
| bt_mesh_gatt_proxy_get() == BT_MESH_GATT_PROXY_ENABLED) { |
| bt_mesh_proxy_beacon_send(NULL); |
| } |
| |
| bt_mesh_subnet_foreach(bt_mesh_beacon_update); |
| |
| if (MYNEWT_VAL(BLE_MESH_CDB)) { |
| bt_mesh_cdb_iv_update(iv_index, iv_update); |
| } |
| |
| if (IS_ENABLED(CONFIG_BT_SETTINGS)) { |
| bt_mesh_store_iv(false); |
| } |
| |
| return true; |
| } |
| |
| uint32_t bt_mesh_next_seq(void) |
| { |
| uint32_t seq = bt_mesh.seq++; |
| |
| if (IS_ENABLED(CONFIG_BT_SETTINGS)) { |
| bt_mesh_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 ble_npl_event *work) |
| { |
| struct os_mbuf *buf; |
| |
| while ((buf = net_buf_slist_get(&bt_mesh.local_queue))) { |
| struct bt_mesh_subnet *sub = LOOPBACK_BUF_SUB(buf); |
| struct bt_mesh_net_rx rx = { |
| .ctx = { |
| .net_idx = sub->net_idx, |
| /* Initialize AppIdx to a sane value */ |
| .app_idx = BT_MESH_KEY_UNUSED, |
| .recv_ttl = TTL(buf->om_data), |
| /* TTL=1 only goes to local IF */ |
| .send_ttl = 1U, |
| .addr = SRC(buf->om_data), |
| .recv_dst = DST(buf->om_data), |
| .recv_rssi = 0, |
| }, |
| .net_if = BT_MESH_NET_IF_LOCAL, |
| .sub = sub, |
| .old_iv = (IVI(buf->om_data) != (bt_mesh.iv_index & 0x01)), |
| .ctl = CTL(buf->om_data), |
| .seq = SEQ(buf->om_data), |
| .new_key = SUBNET_KEY_TX_IDX(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, sub); |
| |
| (void) bt_mesh_trans_recv(buf, &rx); |
| net_buf_unref(buf); |
| } |
| } |
| |
| static const struct bt_mesh_net_cred *net_tx_cred_get(struct bt_mesh_net_tx *tx) |
| { |
| #if defined(BLE_MESH_LOW_POWER) |
| if (tx->friend_cred && bt_mesh_lpn_established()) { |
| 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 os_mbuf *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 os_mbuf *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->om_data, iv_index, cred->privacy); |
| } |
| |
| int bt_mesh_net_encode(struct bt_mesh_net_tx *tx, struct os_mbuf *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) |
| { |
| struct os_mbuf *buf; |
| |
| buf = os_mbuf_get(&loopback_buf_pool, 0); |
| if (!buf) { |
| BT_WARN("Unable to allocate loopback"); |
| return -ENOMEM; |
| } |
| |
| BT_DBG(""); |
| |
| LOOPBACK_BUF_SUB(buf) = tx->sub; |
| |
| net_buf_add_mem(buf, data, len); |
| |
| net_buf_slist_put(&bt_mesh.local_queue, buf); |
| |
| k_work_submit(&bt_mesh.local_work); |
| |
| return 0; |
| } |
| |
| int bt_mesh_net_send(struct bt_mesh_net_tx *tx, struct os_mbuf *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->om_len, net_buf_headroom(buf), |
| net_buf_tailroom(buf)); |
| BT_DBG("Payload len %u: %s", buf->om_len, bt_hex(buf->om_data, buf->om_len)); |
| BT_DBG("Seq 0x%06x", bt_mesh.seq); |
| |
| if (tx->ctx->send_ttl == BT_MESH_TTL_DEFAULT) { |
| tx->ctx->send_ttl = bt_mesh_default_ttl_get(); |
| } |
| |
| cred = net_tx_cred_get(tx); |
| err = net_header_encode(tx, cred->nid, buf); |
| if (err) { |
| goto done; |
| } |
| |
| BT_DBG("encoded %u bytes: %s", buf->om_len, |
| bt_hex(buf->om_data, buf->om_len)); |
| |
| /* Deliver to local network interface if necessary */ |
| if (bt_mesh_fixed_group_match(tx->ctx->addr) || |
| bt_mesh_elem_find(tx->ctx->addr)) { |
| err = loopback(tx, buf->om_data, buf->om_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, cred, BT_MESH_NET_IVI_TX, false); |
| if (err) { |
| goto done; |
| } |
| |
| /* 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)) { |
| /* Notify completion if this only went through the Mesh Proxy */ |
| send_cb_finalize(cb, cb_data); |
| |
| err = 0; |
| goto done; |
| } |
| |
| 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) |
| { |
| struct net_buf_slist_t new_list; |
| struct os_mbuf *buf; |
| |
| BT_DBG("0x%04x", net_idx); |
| |
| net_buf_slist_init(&new_list); |
| |
| while ((buf = net_buf_slist_get(&bt_mesh.local_queue))) { |
| struct bt_mesh_subnet *sub = LOOPBACK_BUF_SUB(buf); |
| |
| if (net_idx == BT_MESH_KEY_ANY || net_idx == sub->net_idx) { |
| BT_DBG("Dropped 0x%06x", SEQ(buf->om_data)); |
| net_buf_unref(buf); |
| } else { |
| net_buf_slist_put(&new_list, buf); |
| } |
| } |
| |
| bt_mesh.local_queue = new_list; |
| } |
| |
| static bool net_decrypt(struct bt_mesh_net_rx *rx, struct os_mbuf *in, |
| struct os_mbuf *out, |
| const struct bt_mesh_net_cred *cred) |
| { |
| bool proxy = (rx->net_if == BT_MESH_NET_IF_PROXY_CFG); |
| |
| if (NID(in->om_data) != cred->nid) { |
| return false; |
| } |
| |
| BT_DBG("NID 0x%02x", NID(in->om_data)); |
| BT_DBG("IVI %u net->iv_index 0x%08x", IVI(in->om_data), bt_mesh.iv_index); |
| |
| rx->old_iv = (IVI(in->om_data) != (bt_mesh.iv_index & 0x01)); |
| os_mbuf_reset(out); |
| net_buf_simple_add_mem(out, in->om_data, in->om_len); |
| |
| if (bt_mesh_net_obfuscate(out->om_data, BT_MESH_NET_IVI_RX(rx), |
| cred->privacy)) { |
| return false; |
| } |
| |
| rx->ctx.addr = SRC(out->om_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_elem_find(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 os_mbuf *sbuf, |
| struct bt_mesh_net_rx *rx) |
| { |
| const struct bt_mesh_net_cred *cred; |
| struct os_mbuf *buf; |
| uint8_t transmit; |
| |
| if (rx->ctx.recv_ttl <= 1U) { |
| return; |
| } |
| |
| if (rx->net_if == BT_MESH_NET_IF_ADV && |
| 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) { |
| transmit = bt_mesh_relay_retransmit_get(); |
| } else { |
| transmit = bt_mesh_net_transmit_get(); |
| } |
| |
| buf = bt_mesh_adv_create(BT_MESH_ADV_DATA, transmit, K_NO_WAIT); |
| if (!buf) { |
| BT_ERR("Out of relay buffers"); |
| return; |
| } |
| |
| /* Leave CTL bit intact */ |
| sbuf->om_data[1] &= 0x80; |
| sbuf->om_data[1] |= rx->ctx.recv_ttl - 1U; |
| |
| net_buf_add_mem(buf, sbuf->om_data, sbuf->om_len); |
| |
| cred = &rx->sub->keys[SUBNET_KEY_TX_IDX(rx->sub)].msg; |
| |
| BT_DBG("Relaying packet. TTL is now %u", TTL(buf->om_data)); |
| |
| /* Update NID if RX or RX was with friend credentials */ |
| if (rx->friend_cred) { |
| buf->om_data[0] &= 0x80; /* Clear everything except IVI */ |
| buf->om_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, cred, BT_MESH_NET_IVI_RX(rx), false)) { |
| BT_ERR("Re-encrypting failed"); |
| goto done; |
| } |
| |
| BT_DBG("encoded %u bytes: %s", buf->om_len, |
| bt_hex(buf->om_data, buf->om_len)); |
| |
| /* Sending to the GATT bearer should only happen if GATT Proxy |
| * is enabled. |
| */ |
| if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) && |
| bt_mesh_gatt_proxy_get() == BT_MESH_GATT_PROXY_ENABLED) { |
| if (bt_mesh_proxy_relay(buf, rx->ctx.recv_dst) && |
| BT_MESH_ADDR_IS_UNICAST(rx->ctx.recv_dst)) { |
| goto done; |
| } |
| } |
| |
| if (relay_to_adv(rx->net_if)) { |
| bt_mesh_adv_send(buf, NULL, NULL); |
| } |
| |
| done: |
| net_buf_unref(buf); |
| } |
| |
| void bt_mesh_net_header_parse(struct os_mbuf *buf, |
| struct bt_mesh_net_rx *rx) |
| { |
| rx->old_iv = (IVI(buf->om_data) != (bt_mesh.iv_index & 0x01)); |
| rx->ctl = CTL(buf->om_data); |
| rx->ctx.recv_ttl = TTL(buf->om_data); |
| rx->seq = SEQ(buf->om_data); |
| rx->ctx.addr = SRC(buf->om_data); |
| rx->ctx.recv_dst = DST(buf->om_data); |
| } |
| |
| int bt_mesh_net_decode(struct os_mbuf *in, enum bt_mesh_net_if net_if, |
| struct bt_mesh_net_rx *rx, struct os_mbuf *out) |
| { |
| if (in->om_len < BT_MESH_NET_MIN_PDU_LEN) { |
| BT_WARN("Dropping too short mesh packet (len %u)", in->om_len); |
| BT_WARN("%s", bt_hex(in->om_data, in->om_len)); |
| return -EINVAL; |
| } |
| |
| if (net_if == BT_MESH_NET_IF_ADV && check_dup(in)) { |
| BT_DBG("duplicate packet; dropping %u bytes: %s", in->om_len, |
| bt_hex(in->om_data, in->om_len)); |
| return -EINVAL; |
| } |
| |
| BT_DBG("%u bytes: %s", in->om_len, bt_hex(in->om_data, in->om_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->om_data); |
| |
| /* Default to responding with TTL 0 for non-routed messages */ |
| if (rx->ctx.recv_ttl == 0) { |
| rx->ctx.send_ttl = 0; |
| } else { |
| rx->ctx.send_ttl = BT_MESH_TTL_DEFAULT; |
| } |
| |
| rx->ctl = CTL(out->om_data); |
| rx->seq = SEQ(out->om_data); |
| rx->ctx.recv_dst = DST(out->om_data); |
| |
| BT_DBG("Decryption successful. Payload len %u: %s", out->om_len, |
| bt_hex(out->om_data, out->om_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->om_data, out->om_len)); |
| |
| msg_cache_add(rx); |
| |
| return 0; |
| } |
| |
| void bt_mesh_net_recv(struct os_mbuf *data, int8_t rssi, |
| enum bt_mesh_net_if net_if) |
| { |
| struct os_mbuf *buf = NET_BUF_SIMPLE(29); |
| 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()) { |
| BT_ERR("Not provisioned; dropping packet"); |
| goto done; |
| } |
| |
| if (bt_mesh_net_decode(data, net_if, &rx, buf)) { |
| goto done; |
| } |
| |
| /* Save the state so the buffer can later be relayed */ |
| os_mbuf_save(buf, &state); |
| |
| rx.local_match = (bt_mesh_fixed_group_match(rx.ctx.recv_dst) || |
| bt_mesh_elem_find(rx.ctx.recv_dst)); |
| |
| if ((MYNEWT_VAL(BLE_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"); |
| goto done; |
| } |
| } |
| |
| /* 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)) { |
| os_mbuf_restore(buf, &state); |
| bt_mesh_net_relay(buf, &rx); |
| } |
| |
| done: |
| os_mbuf_free_chain(buf); |
| } |
| |
| static void ivu_refresh(struct ble_npl_event *work) |
| { |
| 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 == 1 ? "" : "s"); |
| |
| if (bt_mesh.ivu_duration < BT_MESH_IVU_MIN_HOURS) { |
| if (IS_ENABLED(CONFIG_BT_SETTINGS)) { |
| bt_mesh_store_iv(true); |
| } |
| |
| k_delayed_work_submit(&bt_mesh.ivu_timer, BT_MESH_IVU_TIMEOUT); |
| return; |
| } |
| |
| 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)) { |
| bt_mesh_store_iv(true); |
| } |
| } |
| |
| void bt_mesh_net_start(void) |
| { |
| if (bt_mesh_beacon_get() == BT_MESH_BEACON_ENABLED) { |
| bt_mesh_beacon_enable(); |
| } else { |
| bt_mesh_beacon_disable(); |
| } |
| |
| if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) && |
| bt_mesh_gatt_proxy_get() != BT_MESH_GATT_PROXY_NOT_SUPPORTED) { |
| bt_mesh_proxy_gatt_enable(); |
| bt_mesh_adv_update(); |
| } |
| |
| if (IS_ENABLED(CONFIG_BT_MESH_LOW_POWER)) { |
| bt_mesh_lpn_init(); |
| } else { |
| bt_mesh_scan_enable(); |
| } |
| |
| if (IS_ENABLED(CONFIG_BT_MESH_FRIEND)) { |
| bt_mesh_friend_init(); |
| } |
| |
| if (IS_ENABLED(CONFIG_BT_MESH_PROV)) { |
| struct bt_mesh_subnet *sub = bt_mesh_subnet_next(NULL); |
| uint16_t addr = bt_mesh_primary_addr(); |
| |
| bt_mesh_prov_complete(sub->net_idx, addr); |
| } |
| } |
| |
| void bt_mesh_net_init(void) |
| { |
| k_delayed_work_init(&bt_mesh.ivu_timer, ivu_refresh); |
| |
| k_work_init(&bt_mesh.local_work, bt_mesh_net_local); |
| net_buf_slist_init(&bt_mesh.local_queue); |
| |
| os_mbuf_pool_init(&loopback_buf_pool, |
| &loopback_buf_pool_mem, |
| (LOOPBACK_MAX_PDU_LEN + LOOPBACK_USER_DATA_SIZE), |
| MYNEWT_VAL(BLE_MESH_LOOPBACK_BUFS)); |
| |
| } |