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/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright (c) 2022 Benjamin Tissoires
*/
#ifndef __HID_BPF_HELPERS_H
#define __HID_BPF_HELPERS_H
/* "undefine" structs and enums in vmlinux.h, because we "override" them below */
#define hid_bpf_ctx hid_bpf_ctx___not_used
#define hid_report_type hid_report_type___not_used
#define hid_class_request hid_class_request___not_used
#define hid_bpf_attach_flags hid_bpf_attach_flags___not_used
#define HID_INPUT_REPORT HID_INPUT_REPORT___not_used
#define HID_OUTPUT_REPORT HID_OUTPUT_REPORT___not_used
#define HID_FEATURE_REPORT HID_FEATURE_REPORT___not_used
#define HID_REPORT_TYPES HID_REPORT_TYPES___not_used
#define HID_REQ_GET_REPORT HID_REQ_GET_REPORT___not_used
#define HID_REQ_GET_IDLE HID_REQ_GET_IDLE___not_used
#define HID_REQ_GET_PROTOCOL HID_REQ_GET_PROTOCOL___not_used
#define HID_REQ_SET_REPORT HID_REQ_SET_REPORT___not_used
#define HID_REQ_SET_IDLE HID_REQ_SET_IDLE___not_used
#define HID_REQ_SET_PROTOCOL HID_REQ_SET_PROTOCOL___not_used
#define HID_BPF_FLAG_NONE HID_BPF_FLAG_NONE___not_used
#define HID_BPF_FLAG_INSERT_HEAD HID_BPF_FLAG_INSERT_HEAD___not_used
#define HID_BPF_FLAG_MAX HID_BPF_FLAG_MAX___not_used
#include "vmlinux.h"
#undef hid_bpf_ctx
#undef hid_report_type
#undef hid_class_request
#undef hid_bpf_attach_flags
#undef HID_INPUT_REPORT
#undef HID_OUTPUT_REPORT
#undef HID_FEATURE_REPORT
#undef HID_REPORT_TYPES
#undef HID_REQ_GET_REPORT
#undef HID_REQ_GET_IDLE
#undef HID_REQ_GET_PROTOCOL
#undef HID_REQ_SET_REPORT
#undef HID_REQ_SET_IDLE
#undef HID_REQ_SET_PROTOCOL
#undef HID_BPF_FLAG_NONE
#undef HID_BPF_FLAG_INSERT_HEAD
#undef HID_BPF_FLAG_MAX
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <linux/const.h>
enum hid_report_type {
HID_INPUT_REPORT = 0,
HID_OUTPUT_REPORT = 1,
HID_FEATURE_REPORT = 2,
HID_REPORT_TYPES,
};
struct hid_bpf_ctx {
__u32 index;
const struct hid_device *hid;
__u32 allocated_size;
enum hid_report_type report_type;
union {
__s32 retval;
__s32 size;
};
} __attribute__((preserve_access_index));
enum hid_class_request {
HID_REQ_GET_REPORT = 0x01,
HID_REQ_GET_IDLE = 0x02,
HID_REQ_GET_PROTOCOL = 0x03,
HID_REQ_SET_REPORT = 0x09,
HID_REQ_SET_IDLE = 0x0A,
HID_REQ_SET_PROTOCOL = 0x0B,
};
enum hid_bpf_attach_flags {
HID_BPF_FLAG_NONE = 0,
HID_BPF_FLAG_INSERT_HEAD = _BITUL(0),
HID_BPF_FLAG_MAX,
};
/* following are kfuncs exported by HID for HID-BPF */
extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
unsigned int offset,
const size_t __sz) __ksym;
extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym;
extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym;
extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx,
__u8 *data,
size_t buf__sz,
enum hid_report_type type,
enum hid_class_request reqtype) __ksym;
#endif /* __HID_BPF_HELPERS_H */
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