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HID: add source argument to HID low level functions

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This allows to know who actually sent what when we process the request
to the device.
This will be useful for a BPF firewall program to allow or not requests
coming from a dedicated hidraw node client.

Link: https://patch.msgid.link/20240626-hid_hw_req_bpf-v2-2-cfd60fb6c79f@kernel.org
Acked-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
This commit is contained in:
Benjamin Tissoires
2024-06-26 15:46:23 +02:00
parent ebae0b2a6f
commit 67eccf151d
6 changed files with 87 additions and 54 deletions
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16
include/linux/hid_bpf.h
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@@ -66,10 +66,12 @@ struct hid_ops {
int (*hid_hw_raw_request)(struct hid_device *hdev,
unsigned char reportnum, __u8 *buf,
size_t len, enum hid_report_type rtype,
enum hid_class_request reqtype);
int (*hid_hw_output_report)(struct hid_device *hdev, __u8 *buf, size_t len);
enum hid_class_request reqtype,
__u64 source);
int (*hid_hw_output_report)(struct hid_device *hdev, __u8 *buf, size_t len,
__u64 source);
int (*hid_input_report)(struct hid_device *hid, enum hid_report_type type,
u8 *data, u32 size, int interrupt);
u8 *data, u32 size, int interrupt, u64 source);
struct module *owner;
const struct bus_type *bus_type;
};
@@ -110,7 +112,8 @@ struct hid_bpf_ops {
*
* Context: Interrupt context.
*/
int (*hid_device_event)(struct hid_bpf_ctx *ctx, enum hid_report_type report_type);
int (*hid_device_event)(struct hid_bpf_ctx *ctx, enum hid_report_type report_type,
__u64 source);
/**
* @hid_rdesc_fixup: called when the probe function parses the report descriptor
@@ -146,7 +149,7 @@ struct hid_bpf {
#ifdef CONFIG_HID_BPF
u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
u32 *size, int interrupt);
u32 *size, int interrupt, u64 source);
int hid_bpf_connect_device(struct hid_device *hdev);
void hid_bpf_disconnect_device(struct hid_device *hdev);
void hid_bpf_destroy_device(struct hid_device *hid);
@@ -154,7 +157,8 @@ void hid_bpf_device_init(struct hid_device *hid);
u8 *call_hid_bpf_rdesc_fixup(struct hid_device *hdev, u8 *rdesc, unsigned int *size);
#else /* CONFIG_HID_BPF */
static inline u8 *dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
u8 *data, u32 *size, int interrupt) { return data; }
u8 *data, u32 *size, int interrupt,
u64 source) { return data; }
static inline int hid_bpf_connect_device(struct hid_device *hdev) { return 0; }
static inline void hid_bpf_disconnect_device(struct hid_device *hdev) {}
static inline void hid_bpf_destroy_device(struct hid_device *hid) {}