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 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 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; 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; 97 extern int hid_bpf_hw_output_report(struct hid_bpf_ctx *ctx, 98 __u8 *buf, size_t buf__sz) __ksym; 99 extern int hid_bpf_input_report(struct hid_bpf_ctx *ctx, 100 enum hid_report_type type, 101 __u8 *data, 102 size_t buf__sz) __ksym; 103 104 #endif /* __HID_BPF_HELPERS_H */ 105