/**************************************************************************** * wireless/bluetooth/bt_att.c * * Copyright (c) 2016, Intel Corporation * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the copyright holder nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS * ; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include "bt_hcicore.h" #include "bt_conn.h" #include "bt_l2cap.h" #include "bt_att.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #if !defined(CONFIG_BLUETOOTH_DEBUG_ATT) # undef wlinfo # define wlinfo(fmt, ...) #endif #define BT_GATT_PERM_READ_MASK (BT_GATT_PERM_READ | \ BT_GATT_PERM_READ_ENCRYPT | \ BT_GATT_PERM_READ_AUTHEN | \ BT_GATT_PERM_AUTHOR) #define BT_GATT_PERM_WRITE_MASK (BT_GATT_PERM_WRITE | \ BT_GATT_PERM_WRITE_ENCRYPT | \ BT_GATT_PERM_WRITE_AUTHEN | \ BT_GATT_PERM_AUTHOR) #define BT_GATT_PERM_ENCRYPT_MASK (BT_GATT_PERM_READ_ENCRYPT | \ BT_GATT_PERM_WRITE_ENCRYPT) #define BT_GATT_PERM_AUTHEN_MASK (BT_GATT_PERM_READ_AUTHEN | \ BT_GATT_PERM_WRITE_AUTHEN) #define BT_ATT_OP_CMD_MASK (BT_ATT_OP_WRITE_CMD & \ BT_ATT_OP_SIGNED_WRITE_CMD) /**************************************************************************** * Private Types ****************************************************************************/ /* ATT request context */ struct bt_att_req_s { bt_att_func_t func; FAR void *user_data; bt_att_destroy_t destroy; uint8_t op; }; /* ATT channel specific context */ struct bt_att_s { /* The connection this context is associated with */ FAR struct bt_conn_s *conn; uint16_t mtu; struct bt_att_req_s req; /* TODO: Allow more than one pending request */ }; struct find_info_data_s { FAR struct bt_conn_s *conn; FAR struct bt_buf_s *buf; FAR struct bt_att_find_info_rsp_s *rsp; union { FAR struct bt_att_info_16_s *info16; FAR struct bt_att_info_128_s *info128; } u; }; struct find_type_data_s { FAR struct bt_conn_s *conn; FAR struct bt_buf_s *buf; FAR struct bt_att_handle_group_s *group; FAR const void *value; uint8_t value_len; }; struct read_type_data_s { FAR struct bt_conn_s *conn; FAR struct bt_uuid_s *uuid; FAR struct bt_buf_s *buf; FAR struct bt_att_read_type_rsp_s *rsp; FAR struct bt_att_data_s *item; }; struct read_data_s { FAR struct bt_conn_s *conn; uint16_t offset; FAR struct bt_buf_s *buf; FAR struct bt_att_read_rsp_s *rsp; uint8_t err; }; struct read_group_data_s { FAR struct bt_conn_s *conn; FAR struct bt_uuid_s *uuid; FAR struct bt_buf_s *buf; FAR struct bt_att_read_group_rsp_s *rsp; FAR struct bt_att_group_data_s *group; }; struct write_data_s { FAR struct bt_conn_s *conn; FAR struct bt_buf_s *buf; uint8_t op; FAR const void *value; uint8_t len; uint16_t offset; uint8_t err; }; struct flush_data_s { FAR struct bt_conn_s *conn; FAR struct bt_buf_s *buf; uint8_t flags; uint8_t err; }; struct handler_info_s { uint8_t op; CODE uint8_t(*func)(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); uint8_t expect_len; }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static void att_req_destroy(FAR struct bt_att_req_s *req); static void send_err_rsp(struct bt_conn_s *conn, uint8_t req, uint16_t handle, uint8_t err); static uint8_t att_mtu_req(struct bt_conn_s *conn, struct bt_buf_s *data); static uint8_t att_handle_rsp(struct bt_conn_s *conn, void *pdu, uint16_t len, uint8_t err); static uint8_t att_mtu_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static bool range_is_valid(uint16_t start, uint16_t end, FAR uint16_t *err); static uint8_t find_info_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data); static uint8_t att_find_info_rsp(FAR struct bt_conn_s *conn, uint16_t start_handle, uint16_t end_handle); static uint8_t att_find_info_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t find_type_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data); static uint8_t att_find_type_rsp(FAR struct bt_conn_s *conn, FAR uint16_t start_handle, uint16_t end_handle, FAR const void *value, uint8_t value_len); static uint8_t att_find_type_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static bool uuid_create(FAR struct bt_uuid_s *uuid, FAR struct bt_buf_s *data); static uint8_t read_type_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data); static uint8_t att_read_type_rsp(FAR struct bt_conn_s *conn, FAR struct bt_uuid_s *uuid, uint16_t start_handle, uint16_t end_handle); static uint8_t att_read_type_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t err_to_att(int err); static uint8_t check_perm(FAR struct bt_conn_s *conn, FAR const struct bt_gatt_attr_s *attr, uint8_t mask); static uint8_t read_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data); static uint8_t att_read_rsp(FAR struct bt_conn_s *conn, uint8_t op, uint8_t rsp, uint16_t handle, uint16_t offset); static uint8_t att_read_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t att_read_blob_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t att_read_mult_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static uint8_t read_group_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data); static uint8_t att_read_group_rsp(FAR struct bt_conn_s *conn, FAR struct bt_uuid_s *uuid, uint16_t start_handle, uint16_t end_handle); static uint8_t att_read_group_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t write_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data); static uint8_t att_write_rsp(FAR struct bt_conn_s *conn, uint8_t op, uint8_t rsp, uint16_t handle, uint16_t offset, FAR const void *value, uint8_t len); static uint8_t att_write_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t att_prepare_write_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t flush_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data); static uint8_t att_exec_write_rsp(FAR struct bt_conn_s *conn, uint8_t flags); static uint8_t att_exec_write_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t att_write_cmd(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t att_signed_write_cmd(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t att_error_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data); static uint8_t att_handle_find_info_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static uint8_t att_handle_find_type_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static uint8_t att_handle_read_type_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static uint8_t att_handle_read_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static uint8_t att_handle_read_blob_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static uint8_t att_handle_read_mult_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static uint8_t att_handle_write_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf); static void bt_att_receive(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf, FAR void *context, uint16_t cid); static void bt_att_connected(FAR struct bt_conn_s *conn, FAR void *context, uint16_t cid); static void bt_att_disconnected(FAR struct bt_conn_s *conn, FAR void *context, uint16_t cid); /**************************************************************************** * Private Data ****************************************************************************/ static struct bt_att_s g_bt_att_pool[CONFIG_BLUETOOTH_MAX_CONN]; static const struct bt_uuid_s g_primary_uuid = { BT_UUID_16, { BT_UUID_GATT_PRIMARY } }; static const struct bt_uuid_s g_secondary_uuid = { BT_UUID_16, { BT_UUID_GATT_SECONDARY }, }; static const struct handler_info_s g_handlers[] = { { BT_ATT_OP_ERROR_RSP, att_error_rsp, sizeof(struct bt_att_error_rsp_s) }, { BT_ATT_OP_MTU_REQ, att_mtu_req, sizeof(struct bt_att_exchange_mtu_req_s) }, { BT_ATT_OP_MTU_RSP, att_mtu_rsp, sizeof(struct bt_att_exchange_mtu_rsp_s) }, { BT_ATT_OP_FIND_INFO_REQ, att_find_info_req, sizeof(struct bt_att_find_info_req_s) }, { BT_ATT_OP_FIND_INFO_RSP, att_handle_find_info_rsp, sizeof(struct bt_att_find_info_rsp_s) }, { BT_ATT_OP_FIND_TYPE_REQ, att_find_type_req, sizeof(struct bt_att_find_type_req_s) }, { BT_ATT_OP_FIND_TYPE_RSP, att_handle_find_type_rsp, sizeof(struct bt_att_find_type_rsp_s) }, { BT_ATT_OP_READ_TYPE_REQ, att_read_type_req, sizeof(struct bt_att_read_type_req_s) }, { BT_ATT_OP_READ_TYPE_RSP, att_handle_read_type_rsp, sizeof(struct bt_att_read_type_rsp_s) }, { BT_ATT_OP_READ_REQ, att_read_req, sizeof(struct bt_att_read_req_s) }, { BT_ATT_OP_READ_RSP, att_handle_read_rsp, sizeof(struct bt_att_read_rsp_s) }, { BT_ATT_OP_READ_BLOB_REQ, att_read_blob_req, sizeof(struct bt_att_read_blob_req_s) }, { BT_ATT_OP_READ_BLOB_RSP, att_handle_read_blob_rsp, sizeof(struct bt_att_read_blob_rsp_s) }, { BT_ATT_OP_READ_MULT_REQ, att_read_mult_req, BT_ATT_READ_MULT_MIN_LEN_REQ }, { BT_ATT_OP_READ_MULT_RSP, att_handle_read_mult_rsp, sizeof(struct bt_att_read_mult_rsp_s) }, { BT_ATT_OP_READ_GROUP_REQ, att_read_group_req, sizeof(struct bt_att_read_group_req_s) }, { BT_ATT_OP_WRITE_REQ, att_write_req, sizeof(struct bt_att_write_req_s) }, { BT_ATT_OP_WRITE_RSP, att_handle_write_rsp, 0 }, { BT_ATT_OP_PREPARE_WRITE_REQ, att_prepare_write_req, sizeof(struct bt_att_prepare_write_req_s) }, { BT_ATT_OP_EXEC_WRITE_REQ, att_exec_write_req, sizeof(struct bt_att_exec_write_req_s) }, { BT_ATT_OP_WRITE_CMD, att_write_cmd, sizeof(struct bt_att_write_cmd_s) }, { BT_ATT_OP_SIGNED_WRITE_CMD, att_signed_write_cmd, sizeof(struct bt_att_write_cmd_s) + sizeof(struct bt_att_signature_s) } }; #define NHANDLERS (sizeof(g_handlers) / sizeof(struct handler_info_s)) /**************************************************************************** * Private Functions ****************************************************************************/ static void att_req_destroy(FAR struct bt_att_req_s *req) { if (req->destroy) { req->destroy(req->user_data); } memset(req, 0, sizeof(*req)); } static void send_err_rsp(struct bt_conn_s *conn, uint8_t req, uint16_t handle, uint8_t err) { struct bt_att_error_rsp_s *rsp; struct bt_buf_s *buf; /* Ignore opcode 0x00 */ if (!req) { return; } buf = bt_att_create_pdu(conn, BT_ATT_OP_ERROR_RSP, sizeof(*rsp)); if (!buf) { return; } rsp = bt_buf_extend(buf, sizeof(*rsp)); rsp->request = req; rsp->handle = BT_HOST2LE16(handle); rsp->error = err; bt_l2cap_send(conn, BT_L2CAP_CID_ATT, buf); } static uint8_t att_mtu_req(struct bt_conn_s *conn, struct bt_buf_s *data) { FAR struct bt_att_s *att = conn->att; struct bt_att_exchange_mtu_req_s *req; struct bt_att_exchange_mtu_rsp_s *rsp; struct bt_buf_s *buf; uint16_t maxmtu; uint16_t mtu; req = (void *)data->data; mtu = BT_LE162HOST(req->mtu); wlinfo("Client MTU %u\n", mtu); if (mtu > BT_ATT_MAX_LE_MTU || mtu < BT_ATT_DEFAULT_LE_MTU) { return BT_ATT_ERR_INVALID_PDU; } buf = bt_att_create_pdu(conn, BT_ATT_OP_MTU_RSP, sizeof(*rsp)); if (!buf) { return BT_ATT_ERR_UNLIKELY; } /* Select MTU based on the amount of room we have in bt_buf_s including one * extra byte for ATT header. */ maxmtu = bt_buf_tailroom(buf) + 1; if (mtu > maxmtu) { mtu = maxmtu; } wlinfo("Server MTU %u\n", mtu); att->mtu = mtu; rsp = bt_buf_extend(buf, sizeof(*rsp)); rsp->mtu = BT_HOST2LE16(mtu); bt_l2cap_send(conn, BT_L2CAP_CID_ATT, buf); return 0; } static uint8_t att_handle_rsp(struct bt_conn_s *conn, void *pdu, uint16_t len, uint8_t err) { FAR struct bt_att_s *att = conn->att; struct bt_att_req_s req; if (!att->req.func) { return 0; } /* Reset request before callback so another request can be queued */ memcpy(&req, &att->req, sizeof(req)); att->req.func = NULL; req.func(conn, err, pdu, len, req.user_data); att_req_destroy(&req); return 0; } static uint8_t att_mtu_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { FAR struct bt_att_s *att = conn->att; FAR struct bt_att_exchange_mtu_rsp_s *rsp; uint16_t maxmtu; uint16_t mtu; if (!att) { return 0; } rsp = (void *)buf->data; mtu = BT_LE162HOST(rsp->mtu); wlinfo("Server MTU %u\n", mtu); /* Check if MTU is within allowed range */ if (mtu > BT_ATT_MAX_LE_MTU || mtu < BT_ATT_DEFAULT_LE_MTU) { return att_handle_rsp(conn, NULL, 0, BT_ATT_ERR_INVALID_PDU); } /* Clip MTU based on the maximum amount of data bt_buf_s can hold excluding * L2CAP, ACL and driver headers. */ maxmtu = BLUETOOTH_MAX_FRAMELEN - (sizeof(struct bt_l2cap_hdr_s) + sizeof(struct bt_hci_acl_hdr_s) + g_btdev.btdev->head_reserve); if (mtu > maxmtu) { mtu = maxmtu; } att->mtu = mtu; return att_handle_rsp(conn, rsp, buf->len, 0); } static bool range_is_valid(uint16_t start, uint16_t end, FAR uint16_t *err) { /* Handle 0 is invalid */ if (!start || !end) { if (err) { *err = 0; } return false; } /* Check if range is valid */ if (start > end) { if (err) { *err = start; } return false; } return true; } static uint8_t find_info_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data) { FAR struct find_info_data_s *data = user_data; FAR struct bt_att_s *att = data->conn->att; wlinfo("handle 0x%04x\n", attr->handle); /* Initialize rsp at first entry */ if (!data->rsp) { data->rsp = bt_buf_extend(data->buf, sizeof(*data->rsp)); data->rsp->format = (attr->uuid->type == BT_UUID_16) ? BT_ATT_INFO_16 : BT_ATT_INFO_128; } switch (data->rsp->format) { case BT_ATT_INFO_16: if (attr->uuid->type != BT_UUID_16) { return BT_GATT_ITER_STOP; } /* Fast forward to next item position */ data->u.info16 = bt_buf_extend(data->buf, sizeof(*data->u.info16)); data->u.info16->handle = BT_HOST2LE16(attr->handle); data->u.info16->uuid = BT_HOST2LE16(attr->uuid->u.u16); return att->mtu - data->buf->len > sizeof(*data->u.info16) ? BT_GATT_ITER_CONTINUE : BT_GATT_ITER_STOP; case BT_ATT_INFO_128: if (attr->uuid->type != BT_UUID_128) { return BT_GATT_ITER_STOP; } /* Fast forward to next item position */ data->u.info128 = bt_buf_extend(data->buf, sizeof(*data->u.info128)); data->u.info128->handle = BT_HOST2LE16(attr->handle); memcpy(data->u.info128->uuid, attr->uuid->u.u128, sizeof(data->u.info128->uuid)); return att->mtu - data->buf->len > sizeof(*data->u.info128) ? BT_GATT_ITER_CONTINUE : BT_GATT_ITER_STOP; } return BT_GATT_ITER_STOP; } static uint8_t att_find_info_rsp(FAR struct bt_conn_s *conn, uint16_t start_handle, uint16_t end_handle) { struct find_info_data_s data; memset(&data, 0, sizeof(data)); data.buf = bt_att_create_pdu(conn, BT_ATT_OP_FIND_INFO_RSP, 0); if (!data.buf) { return BT_ATT_ERR_UNLIKELY; } data.conn = conn; bt_gatt_foreach_attr(start_handle, end_handle, find_info_cb, &data); if (!data.rsp) { bt_buf_release(data.buf); /* Respond since handle is set */ send_err_rsp(conn, BT_ATT_OP_FIND_INFO_REQ, start_handle, BT_ATT_ERR_ATTRIBUTE_NOT_FOUND); return 0; } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, data.buf); return 0; } static uint8_t att_find_info_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_find_info_req_s *req; uint16_t start_handle; uint16_t end_handle; uint16_t err_handle; req = (void *)data->data; start_handle = BT_LE162HOST(req->start_handle); end_handle = BT_LE162HOST(req->end_handle); wlinfo("start_handle 0x%04x end_handle 0x%04x\n", start_handle, end_handle); if (!range_is_valid(start_handle, end_handle, &err_handle)) { send_err_rsp(conn, BT_ATT_OP_FIND_INFO_REQ, err_handle, BT_ATT_ERR_INVALID_HANDLE); return 0; } return att_find_info_rsp(conn, start_handle, end_handle); } static uint8_t find_type_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data) { FAR struct find_type_data_s *data = user_data; FAR struct bt_att_s *att = data->conn->att; uint8_t uuid[16]; int read; /* Skip if not a primary service */ if (bt_uuid_cmp(attr->uuid, &g_primary_uuid)) { if (data->group && attr->handle > data->group->end_handle) { data->group->end_handle = BT_HOST2LE16(attr->handle); } return BT_GATT_ITER_CONTINUE; } wlinfo("handle 0x%04x\n", attr->handle); /* Stop if there is no space left */ if (att->mtu - data->buf->len < sizeof(*data->group)) { return BT_GATT_ITER_STOP; } /* Read attribute value and store in the buffer */ read = attr->read(data->conn, attr, uuid, sizeof(uuid), 0); if (read < 0) { /* TODO: Return an error if this fails */ return BT_GATT_ITER_STOP; } /* Check if data matches */ if (read != data->value_len || memcmp(data->value, uuid, read)) { /* If a group exists stop otherwise continue */ return data->group ? BT_GATT_ITER_STOP : BT_GATT_ITER_CONTINUE; } /* Fast forward to next item position */ data->group = bt_buf_extend(data->buf, sizeof(*data->group)); data->group->start_handle = BT_HOST2LE16(attr->handle); data->group->end_handle = BT_HOST2LE16(attr->handle); /* Continue to find the end_handle */ return BT_GATT_ITER_CONTINUE; } static uint8_t att_find_type_rsp(FAR struct bt_conn_s *conn, FAR uint16_t start_handle, uint16_t end_handle, FAR const void *value, uint8_t value_len) { struct find_type_data_s data; memset(&data, 0, sizeof(data)); data.buf = bt_att_create_pdu(conn, BT_ATT_OP_FIND_TYPE_RSP, 0); if (!data.buf) { return BT_ATT_ERR_UNLIKELY; } data.conn = conn; data.value = value; data.value_len = value_len; bt_gatt_foreach_attr(start_handle, end_handle, find_type_cb, &data); if (!data.group) { bt_buf_release(data.buf); /* Respond since handle is set */ send_err_rsp(conn, BT_ATT_OP_FIND_TYPE_REQ, start_handle, BT_ATT_ERR_ATTRIBUTE_NOT_FOUND); return 0; } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, data.buf); return 0; } static uint8_t att_find_type_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_find_type_req_s *req; FAR uint8_t *value; uint16_t start_handle; uint16_t end_handle; uint16_t err_handle; uint16_t type; req = (FAR void *)data->data; start_handle = BT_LE162HOST(req->start_handle); end_handle = BT_LE162HOST(req->end_handle); type = BT_LE162HOST(req->type); value = bt_buf_consume(data, sizeof(*req)); wlinfo("start_handle 0x%04x end_handle 0x%04x type %u\n", start_handle, end_handle, type); if (!range_is_valid(start_handle, end_handle, &err_handle)) { send_err_rsp(conn, BT_ATT_OP_FIND_TYPE_REQ, err_handle, BT_ATT_ERR_INVALID_HANDLE); return 0; } /* The Attribute Protocol Find By Type Value Request shall be used with the * Attribute Type parameter set to the UUID for «Primary Service» and the * Attribute Value set to the 16-bit Bluetooth UUID or 128-bit UUID for the * specific primary service. */ if (type != BT_UUID_GATT_PRIMARY) { send_err_rsp(conn, BT_ATT_OP_FIND_TYPE_REQ, start_handle, BT_ATT_ERR_ATTRIBUTE_NOT_FOUND); return 0; } return att_find_type_rsp(conn, start_handle, end_handle, value, data->len); } static bool uuid_create(FAR struct bt_uuid_s *uuid, FAR struct bt_buf_s *data) { if (data->len > sizeof(uuid->u.u128)) { return false; } switch (data->len) { case 2: uuid->type = BT_UUID_16; uuid->u.u16 = bt_buf_get_le16(data); return true; case 16: uuid->type = BT_UUID_128; memcpy(uuid->u.u128, data->data, data->len); return true; } return false; } static uint8_t read_type_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data) { FAR struct read_type_data_s *data = user_data; FAR struct bt_att_s *att = data->conn->att; int read; /* Skip if doesn't match */ if (bt_uuid_cmp(attr->uuid, data->uuid)) { return BT_GATT_ITER_CONTINUE; } wlinfo("handle 0x%04x\n", attr->handle); /* Fast forward to next item position */ data->item = bt_buf_extend(data->buf, sizeof(*data->item)); data->item->handle = BT_HOST2LE16(attr->handle); /* Read attribute value and store in the buffer */ read = attr->read(data->conn, attr, data->buf->data + data->buf->len, att->mtu - data->buf->len, 0); if (read < 0) { /* TODO: Handle read errors */ return BT_GATT_ITER_STOP; } if (!data->rsp->len) { /* Set len to be the first item found */ data->rsp->len = read + sizeof(*data->item); } else if (data->rsp->len != read + sizeof(*data->item)) { /* All items should have the same size */ data->buf->len -= sizeof(*data->item); return BT_GATT_ITER_STOP; } bt_buf_extend(data->buf, read); /* Return true only if there are still space for more items */ return att->mtu - data->buf->len > data->rsp->len ? BT_GATT_ITER_CONTINUE : BT_GATT_ITER_STOP; } static uint8_t att_read_type_rsp(FAR struct bt_conn_s *conn, FAR struct bt_uuid_s *uuid, uint16_t start_handle, uint16_t end_handle) { struct read_type_data_s data; memset(&data, 0, sizeof(data)); data.buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_TYPE_RSP, sizeof(*data.rsp)); if (!data.buf) { return BT_ATT_ERR_UNLIKELY; } data.conn = conn; data.uuid = uuid; data.rsp = bt_buf_extend(data.buf, sizeof(*data.rsp)); data.rsp->len = 0; bt_gatt_foreach_attr(start_handle, end_handle, read_type_cb, &data); if (!data.rsp->len) { bt_buf_release(data.buf); /* Response here since handle is set */ send_err_rsp(conn, BT_ATT_OP_READ_TYPE_REQ, start_handle, BT_ATT_ERR_ATTRIBUTE_NOT_FOUND); return 0; } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, data.buf); return 0; } static uint8_t att_read_type_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_read_type_req_s *req; struct bt_uuid_s uuid; uint16_t start_handle; uint16_t end_handle; uint16_t err_handle; /* Type can only be UUID16 or UUID128 */ if (data->len != sizeof(*req) + sizeof(uuid.u.u16) && data->len != sizeof(*req) + sizeof(uuid.u.u128)) { return BT_ATT_ERR_INVALID_PDU; } req = (FAR void *)data->data; start_handle = BT_LE162HOST(req->start_handle); end_handle = BT_LE162HOST(req->end_handle); bt_buf_consume(data, sizeof(*req)); if (!uuid_create(&uuid, data)) { return BT_ATT_ERR_UNLIKELY; } wlinfo("start_handle 0x%04x end_handle 0x%04x type %u\n", start_handle, end_handle, uuid.u.u16); if (!range_is_valid(start_handle, end_handle, &err_handle)) { send_err_rsp(conn, BT_ATT_OP_READ_TYPE_REQ, err_handle, BT_ATT_ERR_INVALID_HANDLE); return 0; } return att_read_type_rsp(conn, &uuid, start_handle, end_handle); } static uint8_t err_to_att(int err) { wlinfo("%d", err); switch (err) { case -EINVAL: return BT_ATT_ERR_INVALID_OFFSET; case -EFBIG: return BT_ATT_ERR_INVALID_ATTRIBUTE_LEN; default: return BT_ATT_ERR_UNLIKELY; } } static uint8_t check_perm(FAR struct bt_conn_s *conn, FAR const struct bt_gatt_attr_s *attr, uint8_t mask) { if ((mask & BT_GATT_PERM_READ) && !(attr->perm & BT_GATT_PERM_READ)) { return BT_ATT_ERR_READ_NOT_PERMITTED; } if ((mask & BT_GATT_PERM_WRITE) && !(attr->perm & BT_GATT_PERM_WRITE)) { return BT_ATT_ERR_READ_NOT_PERMITTED; } mask &= attr->perm; if (mask & BT_GATT_PERM_AUTHEN_MASK) { /* TODO: Check conn authentication */ return BT_ATT_ERR_AUTHENTICATION; } if ((mask & BT_GATT_PERM_ENCRYPT_MASK) && !conn->encrypt) { return BT_ATT_ERR_INSUFFICIENT_ENCRYPTION; } if (mask & BT_GATT_PERM_AUTHOR) { return BT_ATT_ERR_AUTHORIZATION; } return 0; } static uint8_t read_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data) { FAR struct read_data_s *data = user_data; FAR struct bt_att_s *att = data->conn->att; int read; wlinfo("handle 0x%04x\n", attr->handle); data->rsp = bt_buf_extend(data->buf, sizeof(*data->rsp)); if (!attr->read) { data->err = BT_ATT_ERR_READ_NOT_PERMITTED; return BT_GATT_ITER_STOP; } /* Check attribute permissions */ data->err = check_perm(data->conn, attr, BT_GATT_PERM_READ_MASK); if (data->err) { return BT_GATT_ITER_STOP; } /* Read attribute value and store in the buffer */ read = attr->read(data->conn, attr, data->buf->data + data->buf->len, att->mtu - data->buf->len, data->offset); if (read < 0) { data->err = err_to_att(read); return BT_GATT_ITER_STOP; } bt_buf_extend(data->buf, read); return BT_GATT_ITER_CONTINUE; } static uint8_t att_read_rsp(FAR struct bt_conn_s *conn, uint8_t op, uint8_t rsp, uint16_t handle, uint16_t offset) { struct read_data_s data; if (!handle) { return BT_ATT_ERR_INVALID_HANDLE; } memset(&data, 0, sizeof(data)); data.buf = bt_att_create_pdu(conn, rsp, 0); if (!data.buf) { return BT_ATT_ERR_UNLIKELY; } data.conn = conn; data.offset = offset; bt_gatt_foreach_attr(handle, handle, read_cb, &data); /* In case of error discard data and respond with an error */ if (data.err) { bt_buf_release(data.buf); /* Respond here since handle is set */ send_err_rsp(conn, op, handle, data.err); return 0; } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, data.buf); return 0; } static uint8_t att_read_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_read_req_s *req; uint16_t handle; req = (void *)data->data; handle = BT_LE162HOST(req->handle); wlinfo("handle 0x%04x\n", handle); return att_read_rsp(conn, BT_ATT_OP_READ_REQ, BT_ATT_OP_READ_RSP, handle, 0); } static uint8_t att_read_blob_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_read_blob_req_s *req; uint16_t handle; uint16_t offset; req = (FAR void *)data->data; handle = BT_LE162HOST(req->handle); offset = BT_LE162HOST(req->offset); wlinfo("handle 0x%04x offset %u\n", handle, offset); return att_read_rsp(conn, BT_ATT_OP_READ_BLOB_REQ, BT_ATT_OP_READ_BLOB_RSP, handle, offset); } static uint8_t att_read_mult_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { struct read_data_s data; uint16_t handle; memset(&data, 0, sizeof(data)); data.buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_MULT_RSP, 0); if (!data.buf) { return BT_ATT_ERR_UNLIKELY; } data.conn = conn; while (buf->len >= sizeof(uint16_t)) { handle = bt_buf_get_le16(buf); wlinfo("handle 0x%04x\n", handle); bt_gatt_foreach_attr(handle, handle, read_cb, &data); /* Stop reading in case of error */ if (data.err) { bt_buf_release(data.buf); /* Respond here since handle is set */ send_err_rsp(conn, BT_ATT_OP_READ_MULT_REQ, handle, data.err); return 0; } } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, data.buf); return 0; } static uint8_t read_group_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data) { FAR struct read_group_data_s *data = user_data; FAR struct bt_att_s *att = data->conn->att; int read; /* If UUID don't match update group end_handle */ if (bt_uuid_cmp(attr->uuid, data->uuid)) { if (data->group && attr->handle > data->group->end_handle) { data->group->end_handle = BT_HOST2LE16(attr->handle); } return BT_GATT_ITER_CONTINUE; } wlinfo("handle 0x%04x\n", attr->handle); /* Stop if there is no space left */ if (data->rsp->len && att->mtu - data->buf->len < data->rsp->len) { return BT_GATT_ITER_STOP; } /* Fast forward to next group position */ data->group = bt_buf_extend(data->buf, sizeof(*data->group)); /* Initialize group handle range */ data->group->start_handle = BT_HOST2LE16(attr->handle); data->group->end_handle = BT_HOST2LE16(attr->handle); /* Read attribute value and store in the buffer */ read = attr->read(data->conn, attr, data->buf->data + data->buf->len, att->mtu - data->buf->len, 0); if (read < 0) { /* TODO: Handle read errors */ return BT_GATT_ITER_STOP; } if (!data->rsp->len) { /* Set len to be the first group found */ data->rsp->len = read + sizeof(*data->group); } else if (data->rsp->len != read + sizeof(*data->group)) { /* All groups entries should have the same size */ data->buf->len -= sizeof(*data->group); return false; } bt_buf_extend(data->buf, read); /* Continue to find the end handle */ return BT_GATT_ITER_CONTINUE; } static uint8_t att_read_group_rsp(FAR struct bt_conn_s *conn, FAR struct bt_uuid_s *uuid, uint16_t start_handle, uint16_t end_handle) { struct read_group_data_s data; memset(&data, 0, sizeof(data)); data.buf = bt_att_create_pdu(conn, BT_ATT_OP_READ_GROUP_RSP, sizeof(*data.rsp)); if (!data.buf) { return BT_ATT_ERR_UNLIKELY; } data.conn = conn; data.uuid = uuid; data.rsp = bt_buf_extend(data.buf, sizeof(*data.rsp)); data.rsp->len = 0; bt_gatt_foreach_attr(start_handle, end_handle, read_group_cb, &data); if (!data.rsp->len) { bt_buf_release(data.buf); /* Respond here since handle is set */ send_err_rsp(conn, BT_ATT_OP_READ_GROUP_REQ, start_handle, BT_ATT_ERR_ATTRIBUTE_NOT_FOUND); return 0; } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, data.buf); return 0; } static uint8_t att_read_group_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_read_group_req_s *req; struct bt_uuid_s uuid; uint16_t start_handle; uint16_t end_handle; uint16_t err_handle; /* Type can only be UUID16 or UUID128 */ if (data->len != sizeof(*req) + sizeof(uuid.u.u16) && data->len != sizeof(*req) + sizeof(uuid.u.u128)) { return BT_ATT_ERR_INVALID_PDU; } req = (FAR void *)data->data; start_handle = BT_LE162HOST(req->start_handle); end_handle = BT_LE162HOST(req->end_handle); bt_buf_consume(data, sizeof(*req)); if (!uuid_create(&uuid, data)) { return BT_ATT_ERR_UNLIKELY; } wlinfo("start_handle 0x%04x end_handle 0x%04x type %u\n", start_handle, end_handle, uuid.u.u16); if (!range_is_valid(start_handle, end_handle, &err_handle)) { send_err_rsp(conn, BT_ATT_OP_READ_GROUP_REQ, err_handle, BT_ATT_ERR_INVALID_HANDLE); return 0; } /* Core v4.2, Vol 3, sec 2.5.3 Attribute Grouping: Not all of the grouping * attributes can be used in the ATT Read By Group Type Request. The * «Primary Service» and «Secondary Service» grouping types may be used * in the Read By Group Type Request. The «Characteristic» grouping type * shall not be used in the ATT Read By Group Type Request. */ if (bt_uuid_cmp(&uuid, &g_primary_uuid) && bt_uuid_cmp(&uuid, &g_secondary_uuid)) { send_err_rsp(conn, BT_ATT_OP_READ_GROUP_REQ, start_handle, BT_ATT_ERR_UNSUPPORTED_GROUP_TYPE); return 0; } return att_read_group_rsp(conn, &uuid, start_handle, end_handle); } static uint8_t write_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data) { FAR struct write_data_s *data = user_data; int write; wlinfo("handle 0x%04x\n", attr->handle); /* Check for write support and flush support in case of prepare */ if (!attr->write || (data->op == BT_ATT_OP_PREPARE_WRITE_REQ && !attr->flush)) { data->err = BT_ATT_ERR_WRITE_NOT_PERMITTED; return BT_GATT_ITER_STOP; } /* Check attribute permissions */ data->err = check_perm(data->conn, attr, BT_GATT_PERM_WRITE_MASK); if (data->err) { return BT_GATT_ITER_STOP; } /* Read attribute value and store in the buffer */ write = attr->write(data->conn, attr, data->value, data->len, data->offset); if (write < 0 || write != data->len) { data->err = err_to_att(write); return BT_GATT_ITER_STOP; } /* Flush in case of regular write operation */ if (attr->flush && data->op != BT_ATT_OP_PREPARE_WRITE_REQ) { write = attr->flush(data->conn, attr, BT_GATT_FLUSH_SYNC); if (write < 0) { data->err = err_to_att(write); return BT_GATT_ITER_STOP; } } data->err = 0; return BT_GATT_ITER_CONTINUE; } static uint8_t att_write_rsp(FAR struct bt_conn_s *conn, uint8_t op, uint8_t rsp, uint16_t handle, uint16_t offset, FAR const void *value, uint8_t len) { struct write_data_s data; if (!handle) { return BT_ATT_ERR_INVALID_HANDLE; } memset(&data, 0, sizeof(data)); /* Only allocate buf if required to respond */ if (rsp) { data.buf = bt_att_create_pdu(conn, rsp, 0); if (!data.buf) { return BT_ATT_ERR_UNLIKELY; } } data.conn = conn; data.op = op; data.offset = offset; data.value = value; data.len = len; data.err = BT_ATT_ERR_INVALID_HANDLE; bt_gatt_foreach_attr(handle, handle, write_cb, &data); /* In case of error discard data and respond with an error */ if (data.err) { if (rsp) { bt_buf_release(data.buf); /* Respond here since handle is set */ send_err_rsp(conn, op, handle, data.err); } return 0; } if (data.buf) { /* Add prepare write response */ if (rsp == BT_ATT_OP_PREPARE_WRITE_RSP) { FAR struct bt_att_prepare_write_rsp_s *wrrsp; wrrsp = bt_buf_extend(data.buf, sizeof(*wrrsp)); wrrsp->handle = BT_HOST2LE16(handle); wrrsp->offset = BT_HOST2LE16(offset); bt_buf_extend(data.buf, len); memcpy(wrrsp->value, value, len); } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, data.buf); } return 0; } static uint8_t att_write_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_write_req_s *req; uint16_t handle; req = (FAR void *)data->data; handle = BT_LE162HOST(req->handle); bt_buf_consume(data, sizeof(*req)); wlinfo("handle 0x%04x\n", handle); return att_write_rsp(conn, BT_ATT_OP_WRITE_REQ, BT_ATT_OP_WRITE_RSP, handle, 0, data->data, data->len); } static uint8_t att_prepare_write_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_prepare_write_req_s *req; uint16_t handle; uint16_t offset; req = (FAR void *)data->data; handle = BT_LE162HOST(req->handle); offset = BT_LE162HOST(req->offset); bt_buf_consume(data, sizeof(*req)); wlinfo("handle 0x%04x offset %u\n", handle, offset); return att_write_rsp(conn, BT_ATT_OP_PREPARE_WRITE_REQ, BT_ATT_OP_PREPARE_WRITE_RSP, handle, offset, data->data, data->len); } typedef CODE uint8_t (*bt_gatt_attr_func_t)(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data); static uint8_t flush_cb(FAR const struct bt_gatt_attr_s *attr, FAR void *user_data) { FAR struct flush_data_s *data = user_data; int err; /* If attribute cannot be flushed continue to next */ if (!attr->flush) { return BT_GATT_ITER_CONTINUE; } wlinfo("handle 0x%04x flags 0x%02x\n", attr->handle, data->flags); /* Flush attribute any data cached to be written */ err = attr->flush(data->conn, attr, data->flags); if (err < 0) { data->err = err_to_att(err); return BT_GATT_ITER_STOP; } data->err = 0; return BT_GATT_ITER_CONTINUE; } static uint8_t att_exec_write_rsp(FAR struct bt_conn_s *conn, uint8_t flags) { struct flush_data_s data; memset(&data, 0, sizeof(data)); data.buf = bt_att_create_pdu(conn, BT_ATT_OP_EXEC_WRITE_RSP, 0); if (!data.buf) { return BT_ATT_ERR_UNLIKELY; } data.conn = conn; data.flags = flags; /* Apply to the whole database */ bt_gatt_foreach_attr(0x0000, 0xffff, flush_cb, &data); /* In case of error discard data */ if (data.err) { bt_buf_release(data.buf); return data.err; } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, data.buf); return 0; } static uint8_t att_exec_write_req(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_exec_write_req_s *req; req = (FAR void *)data->data; wlinfo("flags 0x%02x\n", req->flags); return att_exec_write_rsp(conn, req->flags); } static uint8_t att_write_cmd(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_write_cmd_s *req; uint16_t handle; if (data->len < sizeof(*req)) { /* Commands don't have any response */ return 0; } req = (FAR void *)data->data; handle = BT_LE162HOST(req->handle); wlinfo("handle 0x%04x\n", handle); return att_write_rsp(conn, 0, 0, handle, 0, data->data, data->len); } static uint8_t att_signed_write_cmd(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_signed_write_cmd_s *req; uint16_t handle; req = (FAR void *)data->data; handle = BT_LE162HOST(req->handle); bt_buf_consume(data, sizeof(*req)); wlinfo("handle 0x%04x\n", handle); /* TODO: Validate signature */ return att_write_rsp(conn, 0, 0, handle, 0, data->data, data->len - sizeof(struct bt_att_signature_s)); } static uint8_t att_error_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *data) { FAR struct bt_att_s *att = conn->att; FAR struct bt_att_error_rsp_s *rsp; uint8_t err; rsp = (FAR void *)data->data; wlinfo("request 0x%02x handle 0x%04x error 0x%02x\n", rsp->request, BT_LE162HOST(rsp->handle), rsp->error); /* Match request with response */ err = rsp->request == att->req.op ? rsp->error : BT_ATT_ERR_UNLIKELY; return att_handle_rsp(conn, NULL, 0, err); } static uint8_t att_handle_find_info_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { wlinfo("\n"); return att_handle_rsp(conn, buf->data, buf->len, 0); } static uint8_t att_handle_find_type_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { wlinfo("\n"); return att_handle_rsp(conn, buf->data, buf->len, 0); } static uint8_t att_handle_read_type_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { wlinfo("\n"); return att_handle_rsp(conn, buf->data, buf->len, 0); } static uint8_t att_handle_read_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { wlinfo("\n"); return att_handle_rsp(conn, buf->data, buf->len, 0); } static uint8_t att_handle_read_blob_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { wlinfo("\n"); return att_handle_rsp(conn, buf->data, buf->len, 0); } static uint8_t att_handle_read_mult_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { wlinfo("\n"); return att_handle_rsp(conn, buf->data, buf->len, 0); } static uint8_t att_handle_write_rsp(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf) { wlinfo("\n"); return att_handle_rsp(conn, buf->data, buf->len, 0); } static void bt_att_receive(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf, FAR void *context, uint16_t cid) { FAR struct bt_att_hdr_s *hdr = (FAR void *)buf->data; uint8_t err = BT_ATT_ERR_NOT_SUPPORTED; size_t i; DEBUGASSERT(conn->att); if (buf->len < sizeof(*hdr)) { wlerr("ERROR: Too small ATT PDU received\n"); goto done; } wlinfo("Received ATT code 0x%02x len %u\n", hdr->code, buf->len); bt_buf_consume(buf, sizeof(*hdr)); for (i = 0; i < NHANDLERS; i++) { if (hdr->code != g_handlers[i].op) { continue; } if (buf->len < g_handlers[i].expect_len) { wlerr("ERROR: Invalid len %u for code 0x%02x\n", buf->len, hdr->code); err = BT_ATT_ERR_INVALID_PDU; break; } err = g_handlers[i].func(conn, buf); break; } /* Commands don't have response */ if ((hdr->code & BT_ATT_OP_CMD_MASK)) { goto done; } if (err) { wlinfo("ATT error 0x%02x", err); send_err_rsp(conn, hdr->code, 0, err); } done: bt_buf_release(buf); } static void bt_att_connected(FAR struct bt_conn_s *conn, FAR void *context, uint16_t cid) { int i; wlinfo("conn %p handle %u\n", conn, conn->handle); for (i = 0; i < CONFIG_BLUETOOTH_MAX_CONN; i++) { FAR struct bt_att_s *att = &g_bt_att_pool[i]; if (!att->conn) { att->conn = conn; conn->att = att; att->mtu = BT_ATT_DEFAULT_LE_MTU; bt_gatt_connected(conn); return; } } wlerr("ERROR: No available ATT context for conn %p\n", conn); } static void bt_att_disconnected(FAR struct bt_conn_s *conn, FAR void *context, uint16_t cid) { FAR struct bt_att_s *att = conn->att; if (!att) { return; } wlinfo("conn %p handle %u\n", conn, conn->handle); conn->att = NULL; memset(att, 0, sizeof(*att)); bt_gatt_disconnected(conn); } /**************************************************************************** * Public Functions ****************************************************************************/ void bt_att_initialize(void) { static struct bt_l2cap_chan_s chan = { .cid = BT_L2CAP_CID_ATT, .receive = bt_att_receive, .connected = bt_att_connected, .disconnected = bt_att_disconnected, }; bt_l2cap_chan_register(&chan); } FAR struct bt_buf_s *bt_att_create_pdu(FAR struct bt_conn_s *conn, uint8_t op, size_t len) { FAR struct bt_att_hdr_s *hdr; FAR struct bt_buf_s *buf; FAR FAR struct bt_att_s *att = conn->att; if (len + sizeof(op) > att->mtu) { wlwarn("ATT MTU exceeded, max %u, wanted %zu\n", att->mtu, len); return NULL; } buf = bt_l2cap_create_pdu(conn); if (!buf) { return NULL; } hdr = bt_buf_extend(buf, sizeof(*hdr)); hdr->code = op; return buf; } int bt_att_send(FAR struct bt_conn_s *conn, FAR struct bt_buf_s *buf, bt_att_func_t func, FAR void *user_data, bt_att_destroy_t destroy) { FAR struct bt_att_s *att; if (!conn) { return -EINVAL; } att = conn->att; if (!att) { return -ENOTCONN; } if (func) { FAR struct bt_att_hdr_s *hdr; /* Check if there is a request pending */ if (att->req.func) { /* TODO: Allow more than one pending request */ return -EBUSY; } hdr = (void *)buf->data; att->req.op = hdr->code; att->req.func = func; att->req.user_data = user_data; att->req.destroy = destroy; } bt_l2cap_send(conn, BT_L2CAP_CID_ATT, buf); return 0; } void bt_att_cancel(FAR struct bt_conn_s *conn) { FAR struct bt_att_s *att; if (!conn) { return; } att = conn->att; if (!att) { return; } att_req_destroy(&att->req); }