168 lines
5.0 KiB
C
168 lines
5.0 KiB
C
/** @file
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* @brief Internal APIs for Bluetooth RFCOMM handling.
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*/
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/*
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* Copyright (c) 2015-2016 Intel Corporation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <bluetooth/rfcomm.h>
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/* RFCOMM signalling connection specific context */
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struct bt_rfcomm_session {
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/* L2CAP channel this context is associated with */
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struct bt_l2cap_br_chan br_chan;
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struct bt_rfcomm_dlc *dlcs;
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uint16_t mtu;
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uint8_t state;
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bt_rfcomm_role_t role;
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};
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enum {
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BT_RFCOMM_STATE_IDLE,
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BT_RFCOMM_STATE_INIT,
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BT_RFCOMM_STATE_SECURITY_PENDING,
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BT_RFCOMM_STATE_CONNECTING,
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BT_RFCOMM_STATE_CONNECTED,
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BT_RFCOMM_STATE_CONFIG,
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BT_RFCOMM_STATE_DISCONNECTED,
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};
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struct bt_rfcomm_hdr {
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uint8_t address;
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uint8_t control;
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uint8_t length;
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} __packed;
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#define BT_RFCOMM_SABM 0x2f
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#define BT_RFCOMM_UA 0x63
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#define BT_RFCOMM_UIH 0xef
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struct bt_rfcomm_msg_hdr {
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uint8_t type;
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uint8_t len;
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} __packed;
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#define BT_RFCOMM_PN 0x20
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struct bt_rfcomm_pn {
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uint8_t dlci;
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uint8_t flow_ctrl;
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uint8_t priority;
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uint8_t ack_timer;
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uint16_t mtu;
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uint8_t max_retrans;
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uint8_t credits;
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} __packed;
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#define BT_RFCOMM_MSC 0x38
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struct bt_rfcomm_msc {
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uint8_t dlci;
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uint8_t v24_signal;
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} __packed;
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#define BT_RFCOMM_DISC 0x43
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#define BT_RFCOMM_DM 0x0f
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/* DV = 1 IC = 0 RTR = 1 RTC = 1 FC = 0 EXT = 0 */
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#define BT_RFCOMM_DEFAULT_V24_SIG 0x8d
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#define BT_RFCOMM_SIG_MIN_MTU 23
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#define BT_RFCOMM_SIG_MAX_MTU 32767
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#define BT_RFCOMM_CHECK_MTU(mtu) (!!((mtu) >= BT_RFCOMM_SIG_MIN_MTU && \
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(mtu) <= BT_RFCOMM_SIG_MAX_MTU))
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/* Helper to calculate needed outgoing buffer size.
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* Length in rfcomm header can be two bytes depending on user data length.
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* One byte in the tail should be reserved for FCS.
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*/
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#define BT_RFCOMM_BUF_SIZE(mtu) (CONFIG_BLUETOOTH_HCI_SEND_RESERVE + \
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sizeof(struct bt_hci_acl_hdr) + \
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sizeof(struct bt_l2cap_hdr) + \
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sizeof(struct bt_rfcomm_hdr) + 1 + (mtu) + \
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BT_RFCOMM_FCS_SIZE)
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#define BT_RFCOMM_GET_DLCI(addr) (((addr) & 0xfc) >> 2)
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#define BT_RFCOMM_GET_FRAME_TYPE(ctrl) ((ctrl) & 0xef)
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#define BT_RFCOMM_GET_MSG_TYPE(type) (((type) & 0xfc) >> 2)
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#define BT_RFCOMM_GET_MSG_CR(type) (((type) & 0x02) >> 1)
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#define BT_RFCOMM_GET_LEN(len) (((len) & 0xfe) >> 1)
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#define BT_RFCOMM_GET_CHANNEL(dlci) ((dlci) >> 1)
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#define BT_RFCOMM_GET_PF(ctrl) (((ctrl) & 0x10) >> 4)
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#define BT_RFCOMM_SET_ADDR(dlci, cr) ((((dlci) & 0x3f) << 2) | \
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((cr) << 1) | 0x01)
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#define BT_RFCOMM_SET_CTRL(type, pf) (((type) & 0xef) | ((pf) << 4))
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#define BT_RFCOMM_SET_LEN_8(len) (((len) << 1) | 1)
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#define BT_RFCOMM_SET_LEN_16(len) ((len) << 1)
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#define BT_RFCOMM_SET_MSG_TYPE(type, cr) (((type) << 2) | (cr << 1) | 0x01)
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#define BT_RFCOMM_LEN_EXTENDED(len) (!((len) & 0x01))
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/* For CR in UIH Packet header
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* Initiating station have the C/R bit set to 1 and those sent by the
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* responding station have the C/R bit set to 0
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*/
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#define BT_RFCOMM_UIH_CR(role) ((role) == BT_RFCOMM_ROLE_INITIATOR)
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/* For CR in Non UIH Packet header
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* Command
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* Initiator --> Responder 1
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* Responder --> Initiator 0
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* Response
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* Initiator --> Responder 0
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* Responder --> Initiator 1
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*/
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#define BT_RFCOMM_CMD_CR(role) ((role) == BT_RFCOMM_ROLE_INITIATOR)
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#define BT_RFCOMM_RESP_CR(role) ((role) == BT_RFCOMM_ROLE_ACCEPTOR)
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/* For CR in MSG header
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* If the C/R bit is set to 1 the message is a command,
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* if it is set to 0 the message is a response.
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*/
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#define BT_RFCOMM_MSG_CMD_CR 1
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#define BT_RFCOMM_MSG_RESP_CR 0
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#define BT_RFCOMM_DLCI(role, channel) ((((channel) & 0x1f) << 1) | \
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((role) == BT_RFCOMM_ROLE_ACCEPTOR))
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/* Excluding ext bit */
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#define BT_RFCOMM_MAX_LEN_8 127
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/* Length can be 2 bytes depending on data size */
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#define BT_RFCOMM_HDR_SIZE (sizeof(struct bt_rfcomm_hdr) + 1)
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#define BT_RFCOMM_FCS_SIZE 1
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#define BT_RFCOMM_FCS_LEN_UIH 2
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#define BT_RFCOMM_FCS_LEN_NON_UIH 3
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/* For non UIH packets
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* The P bit set to 1 shall be used to solicit a response frame with the
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* F bit set to 1 from the other station.
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*/
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#define BT_RFCOMM_PF_NON_UIH 1
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/* For UIH packets
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* Both stations set the P-bit to 0
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* If credit based flow control is used, If P/F is 1 then one credit byte
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* will be there after control in the frame else no credit byte.
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*/
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#define BT_RFCOMM_PF_UIH 0
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#define BT_RFCOMM_PF_UIH_CREDIT 1
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#define BT_RFCOMM_PF_UIH_NO_CREDIT 0
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/* Initialize RFCOMM signal layer */
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void bt_rfcomm_init(void);
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