357 lines
11 KiB
C
357 lines
11 KiB
C
/** @file
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* @brief Bluetooth L2CAP 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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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_INCLUDE_BLUETOOTH_L2CAP_H_
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#define ZEPHYR_INCLUDE_BLUETOOTH_L2CAP_H_
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/**
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* @brief L2CAP
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* @defgroup bt_l2cap L2CAP
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* @ingroup bluetooth
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* @{
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <atomic.h>
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#include <bluetooth/buf.h>
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#include <bluetooth/conn.h>
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#include <bluetooth/hci.h>
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/* L2CAP header size, used for buffer size calculations */
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#define BT_L2CAP_HDR_SIZE 4
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/** @def BT_L2CAP_BUF_SIZE
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*
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* Helper to calculate needed outgoing buffer size, useful e.g. for
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* creating buffer pools.
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*
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* @param mtu Needed L2CAP MTU.
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*
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* @return Needed buffer size to match the requested L2CAP MTU.
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*/
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#define BT_L2CAP_BUF_SIZE(mtu) (CONFIG_BT_HCI_RESERVE + \
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BT_HCI_ACL_HDR_SIZE + BT_L2CAP_HDR_SIZE + \
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(mtu))
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struct bt_l2cap_chan;
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/** @typedef bt_l2cap_chan_destroy_t
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* @brief Channel destroy callback
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*
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* @param chan Channel object.
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*/
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typedef void (*bt_l2cap_chan_destroy_t)(struct bt_l2cap_chan *chan);
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/** @brief Life-span states of L2CAP CoC channel. Used only by internal APIs
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* dealing with setting channel to proper state depending on operational
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* context.
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*/
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typedef enum bt_l2cap_chan_state {
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/** Channel disconnected */
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BT_L2CAP_DISCONNECTED,
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/** Channel in connecting state */
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BT_L2CAP_CONNECT,
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/** Channel in config state, BR/EDR specific */
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BT_L2CAP_CONFIG,
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/** Channel ready for upper layer traffic on it */
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BT_L2CAP_CONNECTED,
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/** Channel in disconnecting state */
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BT_L2CAP_DISCONNECT,
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} __packed bt_l2cap_chan_state_t;
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/** @brief L2CAP Channel structure. */
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struct bt_l2cap_chan {
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/** Channel connection reference */
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struct bt_conn *conn;
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/** Channel operations reference */
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struct bt_l2cap_chan_ops *ops;
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sys_snode_t node;
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bt_l2cap_chan_destroy_t destroy;
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/* Response Timeout eXpired (RTX) timer */
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struct k_delayed_work rtx_work;
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#if defined(CONFIG_BT_L2CAP_DYNAMIC_CHANNEL)
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bt_l2cap_chan_state_t state;
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/** Remote PSM to be connected */
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u16_t psm;
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/** Helps match request context during CoC */
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u8_t ident;
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bt_security_t required_sec_level;
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#endif /* CONFIG_BT_L2CAP_DYNAMIC_CHANNEL */
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};
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/** @brief LE L2CAP Endpoint structure. */
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struct bt_l2cap_le_endpoint {
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/** Endpoint CID */
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u16_t cid;
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/** Endpoint Maximum Transmission Unit */
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u16_t mtu;
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/** Endpoint Maximum PDU payload Size */
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u16_t mps;
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/** Endpoint initial credits */
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u16_t init_credits;
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/** Endpoint credits */
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struct k_sem credits;
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};
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/** @brief LE L2CAP Channel structure. */
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struct bt_l2cap_le_chan {
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/** Common L2CAP channel reference object */
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struct bt_l2cap_chan chan;
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/** Channel Receiving Endpoint */
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struct bt_l2cap_le_endpoint rx;
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/** Channel Transmission Endpoint */
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struct bt_l2cap_le_endpoint tx;
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/** Channel Transmission queue */
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struct k_fifo tx_queue;
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/** Channel Pending Transmission buffer */
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struct net_buf *tx_buf;
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/** Segment SDU packet from upper layer */
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struct net_buf *_sdu;
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u16_t _sdu_len;
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};
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/** @def BT_L2CAP_LE_CHAN(_ch)
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* @brief Helper macro getting container object of type bt_l2cap_le_chan
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* address having the same container chan member address as object in question.
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*
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* @param _ch Address of object of bt_l2cap_chan type
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*
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* @return Address of in memory bt_l2cap_le_chan object type containing
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* the address of in question object.
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*/
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#define BT_L2CAP_LE_CHAN(_ch) CONTAINER_OF(_ch, struct bt_l2cap_le_chan, chan)
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/** @brief BREDR L2CAP Endpoint structure. */
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struct bt_l2cap_br_endpoint {
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/** Endpoint CID */
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u16_t cid;
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/** Endpoint Maximum Transmission Unit */
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u16_t mtu;
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};
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/** @brief BREDR L2CAP Channel structure. */
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struct bt_l2cap_br_chan {
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/** Common L2CAP channel reference object */
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struct bt_l2cap_chan chan;
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/** Channel Receiving Endpoint */
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struct bt_l2cap_br_endpoint rx;
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/** Channel Transmission Endpoint */
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struct bt_l2cap_br_endpoint tx;
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/* For internal use only */
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atomic_t flags[1];
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};
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/** @brief L2CAP Channel operations structure. */
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struct bt_l2cap_chan_ops {
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/** Channel connected callback
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*
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* If this callback is provided it will be called whenever the
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* connection completes.
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*
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* @param chan The channel that has been connected
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*/
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void (*connected)(struct bt_l2cap_chan *chan);
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/** Channel disconnected callback
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*
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* If this callback is provided it will be called whenever the
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* channel is disconnected, including when a connection gets
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* rejected.
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*
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* @param chan The channel that has been Disconnected
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*/
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void (*disconnected)(struct bt_l2cap_chan *chan);
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/** Channel encrypt_change callback
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*
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* If this callback is provided it will be called whenever the
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* security level changed (indirectly link encryption done) or
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* authentication procedure fails. In both cases security initiator
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* and responder got the final status (HCI status) passed by
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* related to encryption and authentication events from local host's
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* controller.
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*
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* @param chan The channel which has made encryption status changed.
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* @param status HCI status of performed security procedure caused
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* by channel security requirements. The value is populated
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* by HCI layer and set to 0 when success and to non-zero (reference to
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* HCI Error Codes) when security/authentication failed.
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*/
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void (*encrypt_change)(struct bt_l2cap_chan *chan, u8_t hci_status);
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/** Channel alloc_buf callback
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*
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* If this callback is provided the channel will use it to allocate
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* buffers to store incoming data.
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*
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* @param chan The channel requesting a buffer.
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*
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* @return Allocated buffer.
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*/
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struct net_buf *(*alloc_buf)(struct bt_l2cap_chan *chan);
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/** Channel recv callback
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*
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* @param chan The channel receiving data.
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* @param buf Buffer containing incoming data.
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*
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* @return 0 in case of success or negative value in case of error.
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* If -EINPROGRESS is returned user has to confirm once the data has
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* been processed by calling bt_l2cap_chan_recv_complete passing back
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* the buffer received with its original user_data which contains the
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* number of segments/credits used by the packet.
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*/
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int (*recv)(struct bt_l2cap_chan *chan, struct net_buf *buf);
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};
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/** @def BT_L2CAP_CHAN_SEND_RESERVE
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* @brief Headroom needed for outgoing buffers
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*/
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#define BT_L2CAP_CHAN_SEND_RESERVE (CONFIG_BT_HCI_RESERVE + 4 + 4)
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/** @brief L2CAP Server structure. */
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struct bt_l2cap_server {
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/** Server PSM. Possible values:
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*
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* 0 A dynamic value will be auto-allocated when
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* bt_l2cap_server_register() is called.
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*
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* 0x0001-0x007f Standard, Bluetooth SIG-assigned fixed values.
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*
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* 0x0080-0x00ff Dynamically allocated. May be pre-set by the
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* application before server registration (not
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* recommended however), or auto-allocated by the
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* stack if the app gave 0 as the value.
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*/
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u16_t psm;
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/** Required minimim security level */
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bt_security_t sec_level;
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/** Server accept callback
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*
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* This callback is called whenever a new incoming connection requires
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* authorization.
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*
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* @param conn The connection that is requesting authorization
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* @param chan Pointer to received the allocated channel
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int (*accept)(struct bt_conn *conn, struct bt_l2cap_chan **chan);
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sys_snode_t node;
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};
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/** @brief Register L2CAP server.
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*
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* Register L2CAP server for a PSM, each new connection is authorized using
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* the accept() callback which in case of success shall allocate the channel
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* structure to be used by the new connection.
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*
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* For fixed, SIG-assigned PSMs (in the range 0x0001-0x007f) the PSM should
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* be assigned to server->psm before calling this API. For dynamic PSMs
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* (in the range 0x0080-0x00ff) server->psm may be pre-set to a given value
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* (this is however not recommended) or be left as 0, in which case upon
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* return a newly allocated value will have been assigned to it. For
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* dynamically allocated values the expectation is that it's exposed through
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* a GATT service, and that's how L2CAP clients discover how to connect to
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* the server.
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*
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* @param server Server structure.
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int bt_l2cap_server_register(struct bt_l2cap_server *server);
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/** @brief Register L2CAP server on BR/EDR oriented connection.
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*
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* Register L2CAP server for a PSM, each new connection is authorized using
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* the accept() callback which in case of success shall allocate the channel
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* structure to be used by the new connection.
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*
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* @param server Server structure.
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int bt_l2cap_br_server_register(struct bt_l2cap_server *server);
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/** @brief Connect L2CAP channel
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*
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* Connect L2CAP channel by PSM, once the connection is completed channel
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* connected() callback will be called. If the connection is rejected
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* disconnected() callback is called instead.
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* Channel object passed (over an address of it) as second parameter shouldn't
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* be instantiated in application as standalone. Instead of, application should
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* create transport dedicated L2CAP objects, i.e. type of bt_l2cap_le_chan for
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* LE and/or type of bt_l2cap_br_chan for BR/EDR. Then pass to this API
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* the location (address) of bt_l2cap_chan type object which is a member
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* of both transport dedicated objects.
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*
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* @param conn Connection object.
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* @param chan Channel object.
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* @param psm Channel PSM to connect to.
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int bt_l2cap_chan_connect(struct bt_conn *conn, struct bt_l2cap_chan *chan,
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u16_t psm);
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/** @brief Disconnect L2CAP channel
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*
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* Disconnect L2CAP channel, if the connection is pending it will be
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* canceled and as a result the channel disconnected() callback is called.
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* Regarding to input parameter, to get details see reference description
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* to bt_l2cap_chan_connect() API above.
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*
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* @param chan Channel object.
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int bt_l2cap_chan_disconnect(struct bt_l2cap_chan *chan);
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/** @brief Send data to L2CAP channel
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*
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* Send data from buffer to the channel. If credits are not available, buf will
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* be queued and sent as and when credits are received from peer.
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* Regarding to first input parameter, to get details see reference description
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* to bt_l2cap_chan_connect() API above.
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*
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* @return Bytes sent in case of success or negative value in case of error.
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*/
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int bt_l2cap_chan_send(struct bt_l2cap_chan *chan, struct net_buf *buf);
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/** @brief Complete receiving L2CAP channel data
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*
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* Complete the reception of incoming data. This shall only be called if the
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* channel recv callback has returned -EINPROGRESS to process some incoming
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* data. The buffer shall contain the original user_data as that is used for
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* storing the credits/segments used by the packet.
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*
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* @param chan Channel object.
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* @param buf Buffer containing the data.
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*
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* @return 0 in case of success or negative value in case of error.
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*/
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int bt_l2cap_chan_recv_complete(struct bt_l2cap_chan *chan,
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struct net_buf *buf);
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#ifdef __cplusplus
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}
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#endif
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/**
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* @}
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*/
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#endif /* ZEPHYR_INCLUDE_BLUETOOTH_L2CAP_H_ */
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