projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| dbb60c8a BT |
1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* Copyright (c) 2022 Benjamin Tissoires | |
| 3 | */ | |
| 4 | ||
| 5 | #ifndef __HID_BPF_HELPERS_H | |
| 6 | #define __HID_BPF_HELPERS_H | |
| 7 | ||
| ae7487d1 BT |
8 | /* "undefine" structs and enums in vmlinux.h, because we "override" them below */ |
| 9 | #define hid_bpf_ctx hid_bpf_ctx___not_used | |
| 10 | #define hid_report_type hid_report_type___not_used | |
| 11 | #define hid_class_request hid_class_request___not_used | |
| 12 | #define hid_bpf_attach_flags hid_bpf_attach_flags___not_used | |
| 13 | #define HID_INPUT_REPORT HID_INPUT_REPORT___not_used | |
| 14 | #define HID_OUTPUT_REPORT HID_OUTPUT_REPORT___not_used | |
| 15 | #define HID_FEATURE_REPORT HID_FEATURE_REPORT___not_used | |
| 16 | #define HID_REPORT_TYPES HID_REPORT_TYPES___not_used | |
| 17 | #define HID_REQ_GET_REPORT HID_REQ_GET_REPORT___not_used | |
| 18 | #define HID_REQ_GET_IDLE HID_REQ_GET_IDLE___not_used | |
| 19 | #define HID_REQ_GET_PROTOCOL HID_REQ_GET_PROTOCOL___not_used | |
| 20 | #define HID_REQ_SET_REPORT HID_REQ_SET_REPORT___not_used | |
| 21 | #define HID_REQ_SET_IDLE HID_REQ_SET_IDLE___not_used | |
| 22 | #define HID_REQ_SET_PROTOCOL HID_REQ_SET_PROTOCOL___not_used | |
| 23 | #define HID_BPF_FLAG_NONE HID_BPF_FLAG_NONE___not_used | |
| 24 | #define HID_BPF_FLAG_INSERT_HEAD HID_BPF_FLAG_INSERT_HEAD___not_used | |
| 25 | #define HID_BPF_FLAG_MAX HID_BPF_FLAG_MAX___not_used | |
| 26 | ||
| 27 | #include "vmlinux.h" | |
| 28 | ||
| 29 | #undef hid_bpf_ctx | |
| 30 | #undef hid_report_type | |
| 31 | #undef hid_class_request | |
| 32 | #undef hid_bpf_attach_flags | |
| 33 | #undef HID_INPUT_REPORT | |
| 34 | #undef HID_OUTPUT_REPORT | |
| 35 | #undef HID_FEATURE_REPORT | |
| 36 | #undef HID_REPORT_TYPES | |
| 37 | #undef HID_REQ_GET_REPORT | |
| 38 | #undef HID_REQ_GET_IDLE | |
| 39 | #undef HID_REQ_GET_PROTOCOL | |
| 40 | #undef HID_REQ_SET_REPORT | |
| 41 | #undef HID_REQ_SET_IDLE | |
| 42 | #undef HID_REQ_SET_PROTOCOL | |
| 43 | #undef HID_BPF_FLAG_NONE | |
| 44 | #undef HID_BPF_FLAG_INSERT_HEAD | |
| 45 | #undef HID_BPF_FLAG_MAX | |
| 46 | ||
| 47 | #include <bpf/bpf_helpers.h> | |
| 48 | #include <bpf/bpf_tracing.h> | |
| 49 | #include <linux/const.h> | |
| 50 | ||
| 51 | enum hid_report_type { | |
| 52 | HID_INPUT_REPORT = 0, | |
| 53 | HID_OUTPUT_REPORT = 1, | |
| 54 | HID_FEATURE_REPORT = 2, | |
| 55 | ||
| 56 | HID_REPORT_TYPES, | |
| 57 | }; | |
| 58 | ||
| 59 | struct hid_bpf_ctx { | |
| 60 | __u32 index; | |
| 61 | const struct hid_device *hid; | |
| 62 | __u32 allocated_size; | |
| 63 | enum hid_report_type report_type; | |
| 64 | union { | |
| 65 | __s32 retval; | |
| 66 | __s32 size; | |
| 67 | }; | |
| 68 | } __attribute__((preserve_access_index)); | |
| 69 | ||
| 70 | enum hid_class_request { | |
| 71 | HID_REQ_GET_REPORT = 0x01, | |
| 72 | HID_REQ_GET_IDLE = 0x02, | |
| 73 | HID_REQ_GET_PROTOCOL = 0x03, | |
| 74 | HID_REQ_SET_REPORT = 0x09, | |
| 75 | HID_REQ_SET_IDLE = 0x0A, | |
| 76 | HID_REQ_SET_PROTOCOL = 0x0B, | |
| 77 | }; | |
| 78 | ||
| 79 | enum hid_bpf_attach_flags { | |
| 80 | HID_BPF_FLAG_NONE = 0, | |
| 81 | HID_BPF_FLAG_INSERT_HEAD = _BITUL(0), | |
| 82 | HID_BPF_FLAG_MAX, | |
| 83 | }; | |
| 84 | ||
| dbb60c8a BT |
85 | /* following are kfuncs exported by HID for HID-BPF */ |
| 86 | extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, | |
| 87 | unsigned int offset, | |
| 88 | const size_t __sz) __ksym; | |
| 89 | extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym; | |
| 4f7153cf BT |
90 | extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym; |
| 91 | extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym; | |
| 92 | extern int hid_bpf_hw_request(struct hid_bpf_ctx *ctx, | |
| 93 | __u8 *data, | |
| 94 | size_t buf__sz, | |
| 95 | enum hid_report_type type, | |
| 96 | enum hid_class_request reqtype) __ksym; | |
| db624e82 BT |
97 | extern int hid_bpf_hw_output_report(struct hid_bpf_ctx *ctx, |
| 98 | __u8 *buf, size_t buf__sz) __ksym; | |
| dbb60c8a BT |
99 | |
| 100 | #endif /* __HID_BPF_HELPERS_H */ |