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a7e454542b
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
155 lines
3.2 KiB
C
155 lines
3.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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Copyright (c) 2010,2011 Code Aurora Forum. All rights reserved.
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Copyright (c) 2011,2012 Intel Corp.
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*/
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#ifndef __A2MP_H
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#define __A2MP_H
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#include <net/bluetooth/l2cap.h>
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enum amp_mgr_state {
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READ_LOC_AMP_INFO,
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READ_LOC_AMP_ASSOC,
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READ_LOC_AMP_ASSOC_FINAL,
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WRITE_REMOTE_AMP_ASSOC,
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};
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struct amp_mgr {
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struct list_head list;
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struct l2cap_conn *l2cap_conn;
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struct l2cap_chan *a2mp_chan;
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struct l2cap_chan *bredr_chan;
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struct kref kref;
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__u8 ident;
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__u8 handle;
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unsigned long state;
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unsigned long flags;
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struct list_head amp_ctrls;
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struct mutex amp_ctrls_lock;
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};
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struct a2mp_cmd {
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__u8 code;
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__u8 ident;
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__le16 len;
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__u8 data[];
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} __packed;
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/* A2MP command codes */
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#define A2MP_COMMAND_REJ 0x01
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struct a2mp_cmd_rej {
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__le16 reason;
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__u8 data[];
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} __packed;
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#define A2MP_DISCOVER_REQ 0x02
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struct a2mp_discov_req {
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__le16 mtu;
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__le16 ext_feat;
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} __packed;
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struct a2mp_cl {
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__u8 id;
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__u8 type;
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__u8 status;
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} __packed;
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#define A2MP_DISCOVER_RSP 0x03
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struct a2mp_discov_rsp {
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__le16 mtu;
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__le16 ext_feat;
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struct a2mp_cl cl[];
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} __packed;
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#define A2MP_CHANGE_NOTIFY 0x04
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#define A2MP_CHANGE_RSP 0x05
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#define A2MP_GETINFO_REQ 0x06
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struct a2mp_info_req {
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__u8 id;
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} __packed;
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#define A2MP_GETINFO_RSP 0x07
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struct a2mp_info_rsp {
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__u8 id;
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__u8 status;
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__le32 total_bw;
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__le32 max_bw;
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__le32 min_latency;
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__le16 pal_cap;
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__le16 assoc_size;
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} __packed;
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#define A2MP_GETAMPASSOC_REQ 0x08
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struct a2mp_amp_assoc_req {
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__u8 id;
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} __packed;
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#define A2MP_GETAMPASSOC_RSP 0x09
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struct a2mp_amp_assoc_rsp {
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__u8 id;
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__u8 status;
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__u8 amp_assoc[];
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} __packed;
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#define A2MP_CREATEPHYSLINK_REQ 0x0A
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#define A2MP_DISCONNPHYSLINK_REQ 0x0C
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struct a2mp_physlink_req {
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__u8 local_id;
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__u8 remote_id;
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__u8 amp_assoc[];
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} __packed;
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#define A2MP_CREATEPHYSLINK_RSP 0x0B
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#define A2MP_DISCONNPHYSLINK_RSP 0x0D
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struct a2mp_physlink_rsp {
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__u8 local_id;
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__u8 remote_id;
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__u8 status;
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} __packed;
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/* A2MP response status */
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#define A2MP_STATUS_SUCCESS 0x00
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#define A2MP_STATUS_INVALID_CTRL_ID 0x01
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#define A2MP_STATUS_UNABLE_START_LINK_CREATION 0x02
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#define A2MP_STATUS_NO_PHYSICAL_LINK_EXISTS 0x02
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#define A2MP_STATUS_COLLISION_OCCURED 0x03
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#define A2MP_STATUS_DISCONN_REQ_RECVD 0x04
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#define A2MP_STATUS_PHYS_LINK_EXISTS 0x05
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#define A2MP_STATUS_SECURITY_VIOLATION 0x06
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struct amp_mgr *amp_mgr_get(struct amp_mgr *mgr);
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#if IS_ENABLED(CONFIG_BT_HS)
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int amp_mgr_put(struct amp_mgr *mgr);
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struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
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struct sk_buff *skb);
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void a2mp_discover_amp(struct l2cap_chan *chan);
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#else
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static inline int amp_mgr_put(struct amp_mgr *mgr)
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{
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return 0;
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}
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static inline struct l2cap_chan *a2mp_channel_create(struct l2cap_conn *conn,
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struct sk_buff *skb)
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{
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return NULL;
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}
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static inline void a2mp_discover_amp(struct l2cap_chan *chan)
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{
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}
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#endif
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void a2mp_send_getinfo_rsp(struct hci_dev *hdev);
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void a2mp_send_getampassoc_rsp(struct hci_dev *hdev, u8 status);
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void a2mp_send_create_phy_link_req(struct hci_dev *hdev, u8 status);
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void a2mp_send_create_phy_link_rsp(struct hci_dev *hdev, u8 status);
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#endif /* __A2MP_H */
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