zephyr/net/bluetooth/att.c

/* att.c - Attribute protocol handling */

/*
 * Copyright (c) 2015 Intel Corporation
 *
 * 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 Intel Corporation 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.
 */

#include <nanokernel.h>
#include <toolchain.h>
#include <string.h>
#include <errno.h>
#include <misc/byteorder.h>

#include <bluetooth/hci.h>
#include <bluetooth/bluetooth.h>

#include "hci_core.h"
#include "conn.h"
#include "l2cap.h"
#include "att.h"

static void send_err_rsp(struct bt_conn *conn, uint8_t req, uint16_t handle,
			 uint8_t err)
{
	struct bt_att_error_rsp *rsp;
	struct bt_att_hdr *hdr;
	struct bt_buf *buf;

	buf = bt_l2cap_create_pdu(conn, BT_L2CAP_CID_ATT,
				  sizeof(*hdr) + sizeof(*rsp));
	if (!buf) {
		return;
	}

	hdr = (void *)bt_buf_add(buf, sizeof(*hdr));
	hdr->code = BT_ATT_OP_ERROR_RSP;

	rsp = (void *)bt_buf_add(buf, sizeof(*rsp));
	rsp->request = req;
	rsp->handle = sys_cpu_to_le16(handle);
	rsp->error = err;

	bt_conn_send(conn, buf);
}

void bt_att_recv(struct bt_conn *conn, struct bt_buf *buf)
{
	struct bt_att_hdr *hdr = (void *)buf->data;

	if (buf->len < sizeof(*hdr)) {
		BT_ERR("Too small ATT PDU received\n");
		goto done;
	}

	BT_DBG("Received ATT code %u len %u\n", buf->len);

	bt_buf_pull(buf, sizeof*hdr);

	switch (hdr->code) {
	default:
		BT_DBG("Unhandled ATT code %u\n", hdr->code);
		send_err_rsp(conn, hdr->code, 0, BT_ATT_ERR_NOT_SUPPORTED);
		break;
	}

done:
	bt_buf_put(buf);
}