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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_bpf_ops hid_bpf_ops___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
/* do not define kfunc through vmlinux.h as this messes up our custom hack */
#define BPF_NO_KFUNC_PROTOTYPES
#include "vmlinux.h"
#undef hid_bpf_ctx
#undef hid_bpf_ops
#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
#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 {
struct hid_device *hid;
__u32 allocated_size;
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,
};
struct hid_bpf_ops {
int hid_id;
u32 flags;
struct list_head list;
int (*hid_device_event)(struct hid_bpf_ctx *ctx, enum hid_report_type report_type,
u64 source);
int (*hid_rdesc_fixup)(struct hid_bpf_ctx *ctx);
int (*hid_hw_request)(struct hid_bpf_ctx *ctx, unsigned char reportnum,
enum hid_report_type rtype, enum hid_class_request reqtype,
u64 source);
int (*hid_hw_output_report)(struct hid_bpf_ctx *ctx, u64 source);
struct hid_device *hdev;
};
#ifndef BPF_F_BEFORE
#define BPF_F_BEFORE (1U << 3)
#endif
/* 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) __weak __ksym;
extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __weak __ksym;
extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __weak __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) __weak __ksym;
extern int hid_bpf_hw_output_report(struct hid_bpf_ctx *ctx,
__u8 *buf, size_t buf__sz) __weak __ksym;
extern int hid_bpf_input_report(struct hid_bpf_ctx *ctx,
enum hid_report_type type,
__u8 *data,
size_t buf__sz) __weak __ksym;
extern int hid_bpf_try_input_report(struct hid_bpf_ctx *ctx,
enum hid_report_type type,
__u8 *data,
size_t buf__sz) __weak __ksym;
/* bpf_wq implementation */
extern int bpf_wq_init(struct bpf_wq *wq, void *p__map, unsigned int flags) __weak __ksym;
extern int bpf_wq_start(struct bpf_wq *wq, unsigned int flags) __weak __ksym;
extern int bpf_wq_set_callback_impl(struct bpf_wq *wq,
int (callback_fn)(void *map, int *key, void *wq),
unsigned int flags__k, void *aux__ign) __weak __ksym;
#define bpf_wq_set_callback(timer, cb, flags) \
bpf_wq_set_callback_impl(timer, cb, flags, NULL)
#endif /* __HID_BPF_HELPERS_H */
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