2eba256fd2
This replaces initiator flag of session and dlc to enum which has two values INITIATOR and ACCEPTOR. Also this defines macros for CRs in header. Basically there are three types fo CRs. Frame header CR has different meaning for UIH and non UIH packets. Also this renames the existing msg hdr CR to make it consistent. These changes are basically done to make it more readable Change-Id: Ic15e93465b0afbd19d8805f27d7a43f34ef38689 Signed-off-by: Jaganath Kanakkassery <jaganathx.kanakkassery@intel.com>
151 lines
4.4 KiB
C
151 lines
4.4 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_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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/* 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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#define BT_RFCOMM_PF_CREDIT 1
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#define BT_RFCOMM_PF_NO_CREDIT 0
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/* Initialize RFCOMM signal layer */
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void bt_rfcomm_init(void);
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