| /* 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 */ |
