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 51enum 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 59struct 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 70enum 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 79enum 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 */ 86extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, 87 unsigned int offset, 88 const size_t __sz) __ksym; 89extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym; 90extern struct hid_bpf_ctx *hid_bpf_allocate_context(unsigned int hid_id) __ksym; 91extern void hid_bpf_release_context(struct hid_bpf_ctx *ctx) __ksym; 92extern 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 98#endif /* __HID_BPF_HELPERS_H */ 99