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