ref: 79728730d7eba048192efcf6a455beecb5db562d
src/libs/mynewt-nimble/nimble/host/mesh/src/lpn.c
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/* Bluetooth Mesh */ /* * Copyright (c) 2017 Intel Corporation * * SPDX-License-Identifier: Apache-2.0 */ #include "syscfg/syscfg.h" #define MESH_LOG_MODULE BLE_MESH_LOW_POWER_LOG #if MYNEWT_VAL(BLE_MESH_LOW_POWER) #include <stdint.h> #include "mesh/mesh.h" #include "mesh_priv.h" #include "crypto.h" #include "adv.h" #include "net.h" #include "transport.h" #include "heartbeat.h" #include "access.h" #include "beacon.h" #include "foundation.h" #include "lpn.h" #if MYNEWT_VAL(BLE_MESH_LPN_AUTO) #define LPN_AUTO_TIMEOUT K_SECONDS(MYNEWT_VAL(BLE_MESH_LPN_AUTO_TIMEOUT)) #else #define LPN_AUTO_TIMEOUT 0 #endif #define LPN_RECV_DELAY MYNEWT_VAL(BLE_MESH_LPN_RECV_DELAY) #define SCAN_LATENCY min(MYNEWT_VAL(BLE_MESH_LPN_SCAN_LATENCY), \ LPN_RECV_DELAY) #define FRIEND_REQ_RETRY_TIMEOUT K_SECONDS(MYNEWT_VAL(BLE_MESH_LPN_RETRY_TIMEOUT)) #define FRIEND_REQ_WAIT K_MSEC(100) #define FRIEND_REQ_SCAN K_SECONDS(1) #define FRIEND_REQ_TIMEOUT (FRIEND_REQ_WAIT + FRIEND_REQ_SCAN) #define POLL_RETRY_TIMEOUT K_MSEC(100) #define REQ_RETRY_DURATION(lpn) (LPN_RECV_DELAY + (lpn)->adv_duration + \ (lpn)->recv_win + POLL_RETRY_TIMEOUT) #define POLL_TIMEOUT_INIT (MYNEWT_VAL(BLE_MESH_LPN_INIT_POLL_TIMEOUT) * 100) #define POLL_TIMEOUT (MYNEWT_VAL(BLE_MESH_LPN_RECV_DELAY) * 100) #define REQ_ATTEMPTS_MAX 6 #define REQ_ATTEMPTS(lpn) MIN(REQ_ATTEMPTS_MAX, \ POLL_TIMEOUT / REQ_RETRY_DURATION(lpn)) #define POLL_TIMEOUT_MAX(lpn) (POLL_TIMEOUT - \ (REQ_ATTEMPTS(lpn) * REQ_RETRY_DURATION(lpn))) #define CLEAR_ATTEMPTS 3 #define LPN_CRITERIA ((MYNEWT_VAL(BLE_MESH_LPN_MIN_QUEUE_SIZE)) | \ (MYNEWT_VAL(BLE_MESH_LPN_RSSI_FACTOR) << 3) | \ (MYNEWT_VAL(BLE_MESH_LPN_RECV_WIN_FACTOR) << 5)) #define POLL_TO(to) { (uint8_t)((to) >> 16), (uint8_t)((to) >> 8), (uint8_t)(to) } #define LPN_POLL_TO POLL_TO(MYNEWT_VAL(BLE_MESH_LPN_POLL_TIMEOUT)) /* 2 transmissions, 20ms interval */ #define POLL_XMIT BT_MESH_TRANSMIT(1, 20) static void (*lpn_cb)(uint16_t friend_addr, bool established); #if MYNEWT_VAL(BLE_MESH_LOW_POWER_LOG_LVL) == LOG_LEVEL_DEBUG static const char *state2str(int state) { switch (state) { case BT_MESH_LPN_DISABLED: return "disabled"; case BT_MESH_LPN_CLEAR: return "clear"; case BT_MESH_LPN_TIMER: return "timer"; case BT_MESH_LPN_ENABLED: return "enabled"; case BT_MESH_LPN_REQ_WAIT: return "req wait"; case BT_MESH_LPN_WAIT_OFFER: return "wait offer"; case BT_MESH_LPN_ESTABLISHED: return "established"; case BT_MESH_LPN_RECV_DELAY: return "recv delay"; case BT_MESH_LPN_WAIT_UPDATE: return "wait update"; default: return "(unknown)"; } } #endif static inline void lpn_set_state(int state) { #if MYNEWT_VAL(BLE_MESH_LOW_POWER_LOG_LVL) == LOG_LEVEL_DEBUG BT_DBG("%s -> %s", state2str(bt_mesh.lpn.state), state2str(state)); #endif bt_mesh.lpn.state = state; } static inline void group_zero(atomic_t *target) { #if CONFIG_BT_MESH_LPN_GROUPS > 32 int i; for (i = 0; i < ARRAY_SIZE(bt_mesh.lpn.added); i++) { atomic_set(&target[i], 0); } #else atomic_set(target, 0); #endif } static inline void group_set(atomic_t *target, atomic_t *source) { #if CONFIG_BT_MESH_LPN_GROUPS > 32 int i; for (i = 0; i < ARRAY_SIZE(bt_mesh.lpn.added); i++) { atomic_or(&target[i], atomic_get(&source[i])); } #else atomic_or(target, atomic_get(source)); #endif } static inline void group_clear(atomic_t *target, atomic_t *source) { #if CONFIG_BT_MESH_LPN_GROUPS > 32 int i; for (i = 0; i < ARRAY_SIZE(bt_mesh.lpn.added); i++) { atomic_and(&target[i], ~atomic_get(&source[i])); } #else atomic_and(target, ~atomic_get(source)); #endif } static void clear_friendship(bool force, bool disable); static void friend_clear_sent(int err, void *user_data) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; /* Scanning will enable if lpn state still enabled */ lpn->req_attempts++; if (err) { BT_ERR("Sending Friend Request failed (err %d)", err); lpn_set_state(BT_MESH_LPN_ENABLED); clear_friendship(false, lpn->disable); return; } lpn_set_state(BT_MESH_LPN_CLEAR); k_delayed_work_submit(&lpn->timer, FRIEND_REQ_TIMEOUT); } static const struct bt_mesh_send_cb clear_sent_cb = { .end = friend_clear_sent, }; static int send_friend_clear(void) { struct bt_mesh_msg_ctx ctx = { .net_idx = bt_mesh.lpn.sub->net_idx, .app_idx = BT_MESH_KEY_UNUSED, .addr = bt_mesh.lpn.frnd, .send_ttl = 0, }; struct bt_mesh_net_tx tx = { .sub = bt_mesh.lpn.sub, .ctx = &ctx, .src = bt_mesh_primary_addr(), .xmit = bt_mesh_net_transmit_get(), }; struct bt_mesh_ctl_friend_clear req = { .lpn_addr = sys_cpu_to_be16(tx.src), .lpn_counter = sys_cpu_to_be16(bt_mesh.lpn.lpn_counter), }; BT_DBG(""); return bt_mesh_ctl_send(&tx, TRANS_CTL_OP_FRIEND_CLEAR, &req, sizeof(req), &clear_sent_cb, NULL); } static void clear_friendship(bool force, bool disable) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; BT_DBG("force %u disable %u", force, disable); if (!force && lpn->established && !lpn->clear_success && lpn->req_attempts < CLEAR_ATTEMPTS) { send_friend_clear(); lpn->disable = disable; return; } bt_mesh_rx_reset(); k_delayed_work_cancel(&lpn->timer); if (lpn->clear_success) { lpn->old_friend = BT_MESH_ADDR_UNASSIGNED; } else { lpn->old_friend = lpn->frnd; } if (lpn_cb && lpn->frnd != BT_MESH_ADDR_UNASSIGNED) { lpn_cb(lpn->frnd, false); } lpn->frnd = BT_MESH_ADDR_UNASSIGNED; lpn->fsn = 0; lpn->req_attempts = 0; lpn->recv_win = 0; lpn->queue_size = 0; lpn->disable = 0; lpn->sent_req = 0; lpn->established = 0; lpn->clear_success = 0; lpn->sub = NULL; group_zero(lpn->added); group_zero(lpn->pending); group_zero(lpn->to_remove); /* Set this to 1 to force group subscription when the next * Friendship is created, in case lpn->groups doesn't get * modified meanwhile. */ lpn->groups_changed = 1; bt_mesh_hb_feature_changed(BT_MESH_FEAT_LOW_POWER); if (disable) { lpn_set_state(BT_MESH_LPN_DISABLED); return; } lpn_set_state(BT_MESH_LPN_ENABLED); k_delayed_work_submit(&lpn->timer, FRIEND_REQ_RETRY_TIMEOUT); } static void friend_req_sent(uint16_t duration, int err, void *user_data) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; if (err) { BT_ERR("Sending Friend Request failed (err %d)", err); return; } lpn->adv_duration = duration; if (IS_ENABLED(CONFIG_BT_MESH_LPN_ESTABLISHMENT)) { k_delayed_work_submit(&lpn->timer, FRIEND_REQ_WAIT); lpn_set_state(BT_MESH_LPN_REQ_WAIT); } else { k_delayed_work_submit(&lpn->timer, duration + FRIEND_REQ_TIMEOUT); lpn_set_state(BT_MESH_LPN_WAIT_OFFER); } } static const struct bt_mesh_send_cb friend_req_sent_cb = { .start = friend_req_sent, }; static int send_friend_req(struct bt_mesh_lpn *lpn) { const struct bt_mesh_comp *comp = bt_mesh_comp_get(); struct bt_mesh_msg_ctx ctx = { .app_idx = BT_MESH_KEY_UNUSED, .addr = BT_MESH_ADDR_FRIENDS, .send_ttl = 0, }; struct bt_mesh_net_tx tx = { .ctx = &ctx, .src = bt_mesh_primary_addr(), .xmit = POLL_XMIT, }; lpn->lpn_counter++; struct bt_mesh_ctl_friend_req req = { .criteria = LPN_CRITERIA, .recv_delay = LPN_RECV_DELAY, .poll_to = LPN_POLL_TO, .prev_addr = sys_cpu_to_be16(lpn->old_friend), .num_elem = comp->elem_count, .lpn_counter = sys_cpu_to_be16(lpn->lpn_counter), }; BT_DBG(""); lpn->sub = bt_mesh_subnet_next(NULL); if (!lpn->sub) { BT_ERR("No subnets, can't start LPN mode"); return -ENOENT; } ctx.net_idx = lpn->sub->net_idx; tx.sub = lpn->sub; return bt_mesh_ctl_send(&tx, TRANS_CTL_OP_FRIEND_REQ, &req, sizeof(req), &friend_req_sent_cb, NULL); } static void req_sent(uint16_t duration, int err, void *user_data) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; #if MYNEWT_VAL(BLE_MESH_LOW_POWER_LOG_LVL) == LOG_LEVEL_DEBUG BT_DBG("req 0x%02x duration %u err %d state %s", lpn->sent_req, duration, err, state2str(lpn->state)); #endif if (err) { BT_ERR("Sending request failed (err %d)", err); lpn->sent_req = 0; group_zero(lpn->pending); return; } lpn->req_attempts++; lpn->adv_duration = duration; if (lpn->established || IS_ENABLED(CONFIG_BT_MESH_LPN_ESTABLISHMENT)) { lpn_set_state(BT_MESH_LPN_RECV_DELAY); /* We start scanning a bit early to elimitate risk of missing * response data due to HCI and other latencies. */ k_delayed_work_submit(&lpn->timer, LPN_RECV_DELAY - SCAN_LATENCY); } else { lpn_set_state(BT_MESH_LPN_WAIT_UPDATE); k_delayed_work_submit(&lpn->timer, LPN_RECV_DELAY + duration + lpn->recv_win); } } static const struct bt_mesh_send_cb req_sent_cb = { .start = req_sent, }; static int send_friend_poll(void) { struct bt_mesh_msg_ctx ctx = { .net_idx = bt_mesh.lpn.sub->net_idx, .app_idx = BT_MESH_KEY_UNUSED, .addr = bt_mesh.lpn.frnd, .send_ttl = 0, }; struct bt_mesh_net_tx tx = { .sub = bt_mesh.lpn.sub, .ctx = &ctx, .src = bt_mesh_primary_addr(), .xmit = POLL_XMIT, .friend_cred = true, }; struct bt_mesh_lpn *lpn = &bt_mesh.lpn; uint8_t fsn = lpn->fsn; int err; BT_DBG("lpn->sent_req 0x%02x", lpn->sent_req); if (lpn->sent_req) { if (lpn->sent_req != TRANS_CTL_OP_FRIEND_POLL) { lpn->pending_poll = 1; } return 0; } err = bt_mesh_ctl_send(&tx, TRANS_CTL_OP_FRIEND_POLL, &fsn, 1, &req_sent_cb, NULL); if (err == 0) { lpn->pending_poll = 0; lpn->sent_req = TRANS_CTL_OP_FRIEND_POLL; } return err; } void bt_mesh_lpn_disable(bool force) { if (bt_mesh.lpn.state == BT_MESH_LPN_DISABLED) { return; } clear_friendship(force, true); } int bt_mesh_lpn_set(bool enable) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; if (enable) { if (lpn->state != BT_MESH_LPN_DISABLED) { return 0; } } else { if (lpn->state == BT_MESH_LPN_DISABLED) { return 0; } } if (!bt_mesh_is_provisioned()) { if (enable) { lpn_set_state(BT_MESH_LPN_ENABLED); } else { lpn_set_state(BT_MESH_LPN_DISABLED); } return 0; } if (enable) { lpn_set_state(BT_MESH_LPN_ENABLED); if (IS_ENABLED(CONFIG_BT_MESH_LPN_ESTABLISHMENT)) { bt_mesh_scan_disable(); } send_friend_req(lpn); } else { if (IS_ENABLED(CONFIG_BT_MESH_LPN_AUTO) && lpn->state == BT_MESH_LPN_TIMER) { k_delayed_work_cancel(&lpn->timer); lpn_set_state(BT_MESH_LPN_DISABLED); } else { bt_mesh_lpn_disable(false); } } return 0; } static void friend_response_received(struct bt_mesh_lpn *lpn) { BT_DBG("lpn->sent_req 0x%02x", lpn->sent_req); if (lpn->sent_req == TRANS_CTL_OP_FRIEND_POLL) { lpn->fsn++; } k_delayed_work_cancel(&lpn->timer); bt_mesh_scan_disable(); lpn_set_state(BT_MESH_LPN_ESTABLISHED); lpn->req_attempts = 0; lpn->sent_req = 0; } void bt_mesh_lpn_msg_received(struct bt_mesh_net_rx *rx) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; if (lpn->state == BT_MESH_LPN_TIMER) { BT_DBG("Restarting establishment timer"); k_delayed_work_submit(&lpn->timer, LPN_AUTO_TIMEOUT); return; } if (lpn->sent_req != TRANS_CTL_OP_FRIEND_POLL) { BT_WARN("Unexpected message withouth a preceding Poll"); return; } friend_response_received(lpn); BT_DBG("Requesting more messages from Friend"); send_friend_poll(); } static int friend_cred_create(struct bt_mesh_net_cred *cred, const uint8_t key[16]) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; return bt_mesh_friend_cred_create(cred, bt_mesh_primary_addr(), lpn->frnd, lpn->lpn_counter, lpn->frnd_counter, key); } int bt_mesh_lpn_friend_offer(struct bt_mesh_net_rx *rx, struct os_mbuf *buf) { struct bt_mesh_ctl_friend_offer *msg = (void *)buf->om_data; struct bt_mesh_lpn *lpn = &bt_mesh.lpn; uint16_t frnd_counter; int err; if (buf->om_len < sizeof(*msg)) { BT_WARN("Too short Friend Offer"); return -EINVAL; } if (lpn->state != BT_MESH_LPN_WAIT_OFFER) { BT_WARN("Ignoring unexpected Friend Offer"); return 0; } if (!msg->recv_win) { BT_WARN("Prohibited ReceiveWindow value"); return -EINVAL; } frnd_counter = sys_be16_to_cpu(msg->frnd_counter); BT_DBG("recv_win %u queue_size %u sub_list_size %u rssi %d counter %u", msg->recv_win, msg->queue_size, msg->sub_list_size, msg->rssi, frnd_counter); lpn->frnd_counter = frnd_counter; lpn->frnd = rx->ctx.addr; /* Create friend credentials for each of the valid keys in the * friendship subnet: */ for (int i = 0; i < ARRAY_SIZE(lpn->cred); i++) { if (!lpn->sub->keys[i].valid) { continue; } err = friend_cred_create(&lpn->cred[i], lpn->sub->keys[i].net); if (err) { lpn->frnd = BT_MESH_ADDR_UNASSIGNED; return err; } } /* TODO: Add offer acceptance criteria check */ k_delayed_work_cancel(&lpn->timer); lpn->recv_win = msg->recv_win; lpn->queue_size = msg->queue_size; err = send_friend_poll(); if (err) { lpn->sub = NULL; lpn->frnd = BT_MESH_ADDR_UNASSIGNED; lpn->recv_win = 0; lpn->queue_size = 0; return err; } return 0; } int bt_mesh_lpn_friend_clear_cfm(struct bt_mesh_net_rx *rx, struct os_mbuf *buf) { struct bt_mesh_ctl_friend_clear_confirm *msg = (void *)buf->om_data; struct bt_mesh_lpn *lpn = &bt_mesh.lpn; uint16_t addr, counter; if (buf->om_len < sizeof(*msg)) { BT_WARN("Too short Friend Clear Confirm"); return -EINVAL; } if (lpn->state != BT_MESH_LPN_CLEAR) { BT_WARN("Ignoring unexpected Friend Clear Confirm"); return 0; } addr = sys_be16_to_cpu(msg->lpn_addr); counter = sys_be16_to_cpu(msg->lpn_counter); BT_DBG("LPNAddress 0x%04x LPNCounter 0x%04x", addr, counter); if (addr != bt_mesh_primary_addr() || counter != lpn->lpn_counter) { BT_WARN("Invalid parameters in Friend Clear Confirm"); return 0; } lpn->clear_success = 1; clear_friendship(false, lpn->disable); return 0; } static void lpn_group_add(uint16_t group) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; uint16_t *free_slot = NULL; int i; for (i = 0; i < ARRAY_SIZE(lpn->groups); i++) { if (lpn->groups[i] == group) { atomic_clear_bit(lpn->to_remove, i); return; } if (!free_slot && lpn->groups[i] == BT_MESH_ADDR_UNASSIGNED) { free_slot = &lpn->groups[i]; } } if (!free_slot) { BT_WARN("Friend Subscription List exceeded!"); return; } *free_slot = group; lpn->groups_changed = 1; } static void lpn_group_del(uint16_t group) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; int i; for (i = 0; i < ARRAY_SIZE(lpn->groups); i++) { if (lpn->groups[i] == group) { if (atomic_test_bit(lpn->added, i) || atomic_test_bit(lpn->pending, i)) { atomic_set_bit(lpn->to_remove, i); lpn->groups_changed = 1; } else { lpn->groups[i] = BT_MESH_ADDR_UNASSIGNED; } } } } static inline int group_popcount(atomic_t *target) { #if CONFIG_BT_MESH_LPN_GROUPS > 32 int i, count = 0; for (i = 0; i < ARRAY_SIZE(bt_mesh.lpn.added); i++) { count += popcount(atomic_get(&target[i])); } #else return popcount(atomic_get(target)); #endif } static bool sub_update(uint8_t op) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; int added_count = group_popcount(lpn->added); struct bt_mesh_msg_ctx ctx = { .net_idx = lpn->sub->net_idx, .app_idx = BT_MESH_KEY_UNUSED, .addr = lpn->frnd, .send_ttl = 0, }; struct bt_mesh_net_tx tx = { .sub = lpn->sub, .ctx = &ctx, .src = bt_mesh_primary_addr(), .xmit = POLL_XMIT, .friend_cred = true, }; struct bt_mesh_ctl_friend_sub req; size_t i, g; BT_DBG("op 0x%02x sent_req 0x%02x", op, lpn->sent_req); if (lpn->sent_req) { return false; } for (i = 0, g = 0; i < ARRAY_SIZE(lpn->groups); i++) { if (lpn->groups[i] == BT_MESH_ADDR_UNASSIGNED) { continue; } if (op == TRANS_CTL_OP_FRIEND_SUB_ADD) { if (atomic_test_bit(lpn->added, i)) { continue; } } else { if (!atomic_test_bit(lpn->to_remove, i)) { continue; } } if (added_count + g >= lpn->queue_size) { BT_WARN("Friend Queue Size exceeded"); break; } req.addr_list[g++] = sys_cpu_to_be16(lpn->groups[i]); atomic_set_bit(lpn->pending, i); if (g == ARRAY_SIZE(req.addr_list)) { break; } } if (g == 0) { group_zero(lpn->pending); return false; } req.xact = lpn->xact_next++; if (bt_mesh_ctl_send(&tx, op, &req, 1 + g * 2, &req_sent_cb, NULL) < 0) { group_zero(lpn->pending); return false; } lpn->xact_pending = req.xact; lpn->sent_req = op; return true; } static void update_timeout(struct bt_mesh_lpn *lpn) { if (lpn->established) { BT_WARN("No response from Friend during ReceiveWindow"); bt_mesh_scan_disable(); lpn_set_state(BT_MESH_LPN_ESTABLISHED); k_delayed_work_submit(&lpn->timer, POLL_RETRY_TIMEOUT); } else { if (IS_ENABLED(CONFIG_BT_MESH_LPN_ESTABLISHMENT)) { bt_mesh_scan_disable(); } if (lpn->req_attempts < REQ_ATTEMPTS(lpn)) { BT_WARN("Retrying first Friend Poll"); lpn->sent_req = 0; if (send_friend_poll() == 0) { return; } } BT_ERR("Timed out waiting for first Friend Update"); clear_friendship(false, false); } } static void lpn_timeout(struct ble_npl_event *work) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; #if MYNEWT_VAL(BLE_MESH_LOW_POWER_LOG_LVL) == LOG_LEVEL_DEBUG BT_DBG("state: %s", state2str(lpn->state)); #endif switch (lpn->state) { case BT_MESH_LPN_DISABLED: break; case BT_MESH_LPN_CLEAR: clear_friendship(false, bt_mesh.lpn.disable); break; case BT_MESH_LPN_TIMER: BT_DBG("Starting to look for Friend nodes"); lpn_set_state(BT_MESH_LPN_ENABLED); if (IS_ENABLED(CONFIG_BT_MESH_LPN_ESTABLISHMENT)) { bt_mesh_scan_disable(); } /* fall through */ case BT_MESH_LPN_ENABLED: send_friend_req(lpn); break; case BT_MESH_LPN_REQ_WAIT: bt_mesh_scan_enable(); k_delayed_work_submit(&lpn->timer, lpn->adv_duration + FRIEND_REQ_SCAN); lpn_set_state(BT_MESH_LPN_WAIT_OFFER); break; case BT_MESH_LPN_WAIT_OFFER: BT_WARN("No acceptable Friend Offers received"); if (IS_ENABLED(CONFIG_BT_MESH_LPN_ESTABLISHMENT)) { bt_mesh_scan_disable(); } lpn->lpn_counter++; lpn_set_state(BT_MESH_LPN_ENABLED); lpn->sent_req = 0U; k_delayed_work_submit(&lpn->timer, FRIEND_REQ_RETRY_TIMEOUT); break; case BT_MESH_LPN_ESTABLISHED: if (lpn->req_attempts < REQ_ATTEMPTS(lpn)) { uint8_t req = lpn->sent_req; lpn->sent_req = 0; if (!req || req == TRANS_CTL_OP_FRIEND_POLL) { send_friend_poll(); } else { sub_update(req); } break; } BT_ERR("No response from Friend after %u retries", lpn->req_attempts); lpn->req_attempts = 0; clear_friendship(false, false); break; case BT_MESH_LPN_RECV_DELAY: k_delayed_work_submit(&lpn->timer, lpn->adv_duration + SCAN_LATENCY + lpn->recv_win); bt_mesh_scan_enable(); lpn_set_state(BT_MESH_LPN_WAIT_UPDATE); break; case BT_MESH_LPN_WAIT_UPDATE: update_timeout(lpn); break; default: __ASSERT(0, "Unhandled LPN state"); break; } } void bt_mesh_lpn_group_add(uint16_t group) { BT_DBG("group 0x%04x", group); lpn_group_add(group); if (!bt_mesh_lpn_established() || bt_mesh.lpn.sent_req) { return; } sub_update(TRANS_CTL_OP_FRIEND_SUB_ADD); } void bt_mesh_lpn_group_del(uint16_t *groups, size_t group_count) { int i; for (i = 0; i < group_count; i++) { if (groups[i] != BT_MESH_ADDR_UNASSIGNED) { BT_DBG("group 0x%04x", groups[i]); lpn_group_del(groups[i]); } } if (!bt_mesh_lpn_established() || bt_mesh.lpn.sent_req) { return; } sub_update(TRANS_CTL_OP_FRIEND_SUB_REM); } static int32_t poll_timeout(struct bt_mesh_lpn *lpn) { /* If we're waiting for segment acks keep polling at high freq */ if (bt_mesh_tx_in_progress()) { return min(POLL_TIMEOUT_MAX(lpn), K_SECONDS(1)); } if (lpn->poll_timeout < POLL_TIMEOUT_MAX(lpn)) { lpn->poll_timeout *= 2; lpn->poll_timeout = min(lpn->poll_timeout, POLL_TIMEOUT_MAX(lpn)); } BT_DBG("Poll Timeout is %ums", (unsigned) lpn->poll_timeout); return lpn->poll_timeout; } int bt_mesh_lpn_friend_sub_cfm(struct bt_mesh_net_rx *rx, struct os_mbuf *buf) { struct bt_mesh_ctl_friend_sub_confirm *msg = (void *)buf->om_data; struct bt_mesh_lpn *lpn = &bt_mesh.lpn; if (buf->om_len < sizeof(*msg)) { BT_WARN("Too short Friend Subscription Confirm"); return -EINVAL; } BT_DBG("xact 0x%02x", msg->xact); if (!lpn->sent_req) { BT_WARN("No pending subscription list message"); return 0; } if (msg->xact != lpn->xact_pending) { BT_WARN("Transaction mismatch (0x%02x != 0x%02x)", msg->xact, lpn->xact_pending); return 0; } if (lpn->sent_req == TRANS_CTL_OP_FRIEND_SUB_ADD) { group_set(lpn->added, lpn->pending); group_zero(lpn->pending); } else if (lpn->sent_req == TRANS_CTL_OP_FRIEND_SUB_REM) { int i; group_clear(lpn->added, lpn->pending); for (i = 0; i < ARRAY_SIZE(lpn->groups); i++) { if (atomic_test_and_clear_bit(lpn->pending, i) && atomic_test_and_clear_bit(lpn->to_remove, i)) { lpn->groups[i] = BT_MESH_ADDR_UNASSIGNED; } } } else { BT_WARN("Unexpected Friend Subscription Confirm"); return 0; } friend_response_received(lpn); if (lpn->groups_changed) { sub_update(TRANS_CTL_OP_FRIEND_SUB_ADD); sub_update(TRANS_CTL_OP_FRIEND_SUB_REM); if (!lpn->sent_req) { lpn->groups_changed = 0; } } if (lpn->pending_poll) { send_friend_poll(); } if (!lpn->sent_req) { int32_t timeout = poll_timeout(lpn); k_delayed_work_submit(&lpn->timer, K_MSEC(timeout)); } return 0; } int bt_mesh_lpn_friend_update(struct bt_mesh_net_rx *rx, struct os_mbuf *buf) { struct bt_mesh_ctl_friend_update *msg = (void *)buf->om_data; struct bt_mesh_lpn *lpn = &bt_mesh.lpn; struct bt_mesh_subnet *sub = rx->sub; uint32_t iv_index; if (buf->om_len < sizeof(*msg)) { BT_WARN("Too short Friend Update"); return -EINVAL; } if (lpn->sent_req != TRANS_CTL_OP_FRIEND_POLL) { BT_WARN("Unexpected friend update"); return 0; } if (sub->kr_phase == BT_MESH_KR_PHASE_2 && !rx->new_key) { BT_WARN("Ignoring Phase 2 KR Update secured using old key"); return 0; } if (atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_INITIATOR) && (atomic_test_bit(bt_mesh.flags, BT_MESH_IVU_IN_PROGRESS) == BT_MESH_IV_UPDATE(msg->flags))) { bt_mesh_beacon_ivu_initiator(false); } if (!lpn->established) { /* This is normally checked on the transport layer, however * in this state we're also still accepting master * credentials so we need to ensure the right ones (Friend * Credentials) were used for this message. */ if (!rx->friend_cred) { BT_WARN("Friend Update with wrong credentials"); return -EINVAL; } lpn->established = 1; BT_INFO("Friendship established with 0x%04x", lpn->frnd); bt_mesh_hb_feature_changed(BT_MESH_FEAT_LOW_POWER); if (lpn_cb) { lpn_cb(lpn->frnd, true); } /* Set initial poll timeout */ lpn->poll_timeout = min(POLL_TIMEOUT_MAX(lpn), POLL_TIMEOUT_INIT); } friend_response_received(lpn); iv_index = sys_be32_to_cpu(msg->iv_index); BT_DBG("flags 0x%02x iv_index 0x%08x md %u", msg->flags, (unsigned) iv_index, msg->md); bt_mesh_kr_update(sub, BT_MESH_KEY_REFRESH(msg->flags), rx->new_key); bt_mesh_net_iv_update(iv_index, BT_MESH_IV_UPDATE(msg->flags)); if (lpn->groups_changed) { sub_update(TRANS_CTL_OP_FRIEND_SUB_ADD); sub_update(TRANS_CTL_OP_FRIEND_SUB_REM); if (!lpn->sent_req) { lpn->groups_changed = 0; } } if (msg->md) { BT_DBG("Requesting for more messages"); send_friend_poll(); } if (!lpn->sent_req) { int32_t timeout = poll_timeout(lpn); k_delayed_work_submit(&lpn->timer, K_MSEC(timeout)); } return 0; } int bt_mesh_lpn_poll(void) { if (!bt_mesh.lpn.established) { return -EAGAIN; } BT_DBG("Requesting more messages"); return send_friend_poll(); } void bt_mesh_lpn_set_cb(void (*cb)(uint16_t friend_addr, bool established)) { lpn_cb = cb; } static void subnet_evt(struct bt_mesh_subnet *sub, enum bt_mesh_key_evt evt) { switch (evt) { case BT_MESH_KEY_DELETED: if (sub == bt_mesh.lpn.sub) { BT_DBG("NetKey deleted"); clear_friendship(true, false); } break; case BT_MESH_KEY_UPDATED: BT_DBG("NetKey updated"); friend_cred_create(&bt_mesh.lpn.cred[1], sub->keys[1].net); break; default: break; } } int bt_mesh_lpn_init(void) { struct bt_mesh_lpn *lpn = &bt_mesh.lpn; if (!bt_mesh_subnet_cb_list[2]) { bt_mesh_subnet_cb_list[2] = subnet_evt; } BT_DBG(""); lpn->groups_changed = 0; k_delayed_work_init(&lpn->timer, lpn_timeout); if (lpn->state == BT_MESH_LPN_ENABLED) { if (IS_ENABLED(CONFIG_BT_MESH_LPN_ESTABLISHMENT)) { bt_mesh_scan_disable(); } else { bt_mesh_scan_enable(); } send_friend_req(lpn); } else { bt_mesh_scan_enable(); if (IS_ENABLED(CONFIG_BT_MESH_LPN_AUTO)) { BT_DBG("Waiting %u ms for messages", LPN_AUTO_TIMEOUT); lpn_set_state(BT_MESH_LPN_TIMER); k_delayed_work_submit(&lpn->timer, LPN_AUTO_TIMEOUT); } } return 0; } #endif /* MYNEWT_VAL(BLE_MESH_LOW_POWER) */ |