@@ -1284,6 +1284,8 @@ config HID_KUNIT_TEST
endmenu
+source "drivers/hid/bpf/Kconfig"
+
endif # HID
source "drivers/hid/usbhid/Kconfig"
@@ -5,6 +5,8 @@
hid-y := hid-core.o hid-input.o hid-quirks.o
hid-$(CONFIG_DEBUG_FS) += hid-debug.o
+obj-$(CONFIG_HID_BPF) += bpf/
+
obj-$(CONFIG_HID) += hid.o
obj-$(CONFIG_UHID) += uhid.o
new file mode 100644
@@ -0,0 +1,17 @@
+# SPDX-License-Identifier: GPL-2.0-only
+menu "HID-BPF support"
+
+config HID_BPF
+ bool "HID-BPF support"
+ default HID_SUPPORT
+ depends on BPF && BPF_SYSCALL
+ help
+ This option allows to support eBPF programs on the HID subsystem.
+ eBPF programs can fix HID devices in a lighter way than a full
+ kernel patch and allow a lot more flexibility.
+
+ For documentation, see Documentation/hid/hid-bpf.rst
+
+ If unsure, say Y.
+
+endmenu
new file mode 100644
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for HID-BPF
+#
+
+LIBBPF_INCLUDE = $(srctree)/tools/lib
+
+obj-$(CONFIG_HID_BPF) += hid_bpf.o
+CFLAGS_hid_bpf_dispatch.o += -I$(LIBBPF_INCLUDE)
+CFLAGS_hid_bpf_jmp_table.o += -I$(LIBBPF_INCLUDE)
+hid_bpf-objs += hid_bpf_dispatch.o hid_bpf_jmp_table.o
new file mode 100644
@@ -0,0 +1,93 @@
+# SPDX-License-Identifier: GPL-2.0
+OUTPUT := .output
+abs_out := $(abspath $(OUTPUT))
+
+CLANG ?= clang
+LLC ?= llc
+LLVM_STRIP ?= llvm-strip
+
+TOOLS_PATH := $(abspath ../../../../tools)
+BPFTOOL_SRC := $(TOOLS_PATH)/bpf/bpftool
+BPFTOOL_OUTPUT := $(abs_out)/bpftool
+DEFAULT_BPFTOOL := $(BPFTOOL_OUTPUT)/bootstrap/bpftool
+BPFTOOL ?= $(DEFAULT_BPFTOOL)
+
+LIBBPF_SRC := $(TOOLS_PATH)/lib/bpf
+LIBBPF_OUTPUT := $(abs_out)/libbpf
+LIBBPF_DESTDIR := $(LIBBPF_OUTPUT)
+LIBBPF_INCLUDE := $(LIBBPF_DESTDIR)/include
+BPFOBJ := $(LIBBPF_OUTPUT)/libbpf.a
+
+INCLUDES := -I$(OUTPUT) -I$(LIBBPF_INCLUDE) -I$(TOOLS_PATH)/include/uapi
+CFLAGS := -g -Wall
+
+VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
+ $(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
+ ../../../../vmlinux \
+ /sys/kernel/btf/vmlinux \
+ /boot/vmlinux-$(shell uname -r)
+VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
+ifeq ($(VMLINUX_BTF),)
+$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
+endif
+
+ifeq ($(V),1)
+Q =
+msg =
+else
+Q = @
+msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
+MAKEFLAGS += --no-print-directory
+submake_extras := feature_display=0
+endif
+
+.DELETE_ON_ERROR:
+
+.PHONY: all clean
+
+all: entrypoints.lskel.h
+
+clean:
+ $(call msg,CLEAN)
+ $(Q)rm -rf $(OUTPUT) entrypoints
+
+entrypoints.lskel.h: $(OUTPUT)/entrypoints.bpf.o | $(BPFTOOL)
+ $(call msg,GEN-SKEL,$@)
+ $(Q)$(BPFTOOL) gen skeleton -L $< > $@
+
+
+$(OUTPUT)/entrypoints.bpf.o: entrypoints.bpf.c $(OUTPUT)/vmlinux.h $(BPFOBJ) | $(OUTPUT)
+ $(call msg,BPF,$@)
+ $(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES) \
+ -c $(filter %.c,$^) -o $@ && \
+ $(LLVM_STRIP) -g $@
+
+$(OUTPUT)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
+ifeq ($(VMLINUX_H),)
+ $(call msg,GEN,,$@)
+ $(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
+else
+ $(call msg,CP,,$@)
+ $(Q)cp "$(VMLINUX_H)" $@
+endif
+
+$(OUTPUT) $(LIBBPF_OUTPUT) $(BPFTOOL_OUTPUT):
+ $(call msg,MKDIR,$@)
+ $(Q)mkdir -p $@
+
+$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(LIBBPF_OUTPUT)
+ $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \
+ OUTPUT=$(abspath $(dir $@))/ prefix= \
+ DESTDIR=$(LIBBPF_DESTDIR) $(abspath $@) install_headers
+
+ifeq ($(CROSS_COMPILE),)
+$(DEFAULT_BPFTOOL): $(BPFOBJ) | $(BPFTOOL_OUTPUT)
+ $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \
+ OUTPUT=$(BPFTOOL_OUTPUT)/ \
+ LIBBPF_BOOTSTRAP_OUTPUT=$(LIBBPF_OUTPUT)/ \
+ LIBBPF_BOOTSTRAP_DESTDIR=$(LIBBPF_DESTDIR)/ bootstrap
+else
+$(DEFAULT_BPFTOOL): | $(BPFTOOL_OUTPUT)
+ $(Q)$(MAKE) $(submake_extras) -C $(BPFTOOL_SRC) \
+ OUTPUT=$(BPFTOOL_OUTPUT)/ bootstrap
+endif
new file mode 100644
@@ -0,0 +1,4 @@
+WARNING:
+If you change "entrypoints.bpf.c" do "make -j" in this directory to rebuild "entrypoints.skel.h".
+Make sure to have clang 10 installed.
+See Documentation/bpf/bpf_devel_QA.rst
new file mode 100644
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2022 Benjamin Tissoires */
+
+#include ".output/vmlinux.h"
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+#define HID_BPF_MAX_PROGS 1024
+
+extern bool call_hid_bpf_prog_release(u64 prog, int table_cnt) __ksym;
+
+struct {
+ __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
+ __uint(max_entries, HID_BPF_MAX_PROGS);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(__u32));
+} hid_jmp_table SEC(".maps");
+
+struct {
+ __uint(type, BPF_MAP_TYPE_HASH);
+ __uint(max_entries, HID_BPF_MAX_PROGS * HID_BPF_PROG_TYPE_MAX);
+ __type(key, void *);
+ __type(value, __u8);
+} progs_map SEC(".maps");
+
+SEC("fmod_ret/__hid_bpf_tail_call")
+int BPF_PROG(hid_tail_call, struct hid_bpf_ctx *hctx)
+{
+ bpf_tail_call(ctx, &hid_jmp_table, hctx->index);
+
+ return 0;
+}
+
+static void release_prog(u64 prog)
+{
+ u8 *value;
+
+ value = bpf_map_lookup_elem(&progs_map, &prog);
+ if (!value)
+ return;
+
+ if (call_hid_bpf_prog_release(prog, *value))
+ bpf_map_delete_elem(&progs_map, &prog);
+}
+
+SEC("fexit/bpf_prog_release")
+int BPF_PROG(hid_prog_release, struct inode *inode, struct file *filp)
+{
+ u64 prog = (u64)filp->private_data;
+
+ release_prog(prog);
+
+ return 0;
+}
+
+SEC("fexit/bpf_free_inode")
+int BPF_PROG(hid_free_inode, struct inode *inode)
+{
+ u64 prog = (u64)inode->i_private;
+
+ release_prog(prog);
+
+ return 0;
+}
+
+char LICENSE[] SEC("license") = "GPL";
new file mode 100644
@@ -0,0 +1,648 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+/* THIS FILE IS AUTOGENERATED BY BPFTOOL! */
+#ifndef __ENTRYPOINTS_BPF_SKEL_H__
+#define __ENTRYPOINTS_BPF_SKEL_H__
+
+#include <bpf/skel_internal.h>
+
+struct entrypoints_bpf {
+ struct bpf_loader_ctx ctx;
+ struct {
+ struct bpf_map_desc hid_jmp_table;
+ struct bpf_map_desc progs_map;
+ } maps;
+ struct {
+ struct bpf_prog_desc hid_tail_call;
+ struct bpf_prog_desc hid_prog_release;
+ struct bpf_prog_desc hid_free_inode;
+ } progs;
+ struct {
+ int hid_tail_call_fd;
+ int hid_prog_release_fd;
+ int hid_free_inode_fd;
+ } links;
+};
+
+static inline int
+entrypoints_bpf__hid_tail_call__attach(struct entrypoints_bpf *skel)
+{
+ int prog_fd = skel->progs.hid_tail_call.prog_fd;
+ int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+ if (fd > 0)
+ skel->links.hid_tail_call_fd = fd;
+ return fd;
+}
+
+static inline int
+entrypoints_bpf__hid_prog_release__attach(struct entrypoints_bpf *skel)
+{
+ int prog_fd = skel->progs.hid_prog_release.prog_fd;
+ int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+ if (fd > 0)
+ skel->links.hid_prog_release_fd = fd;
+ return fd;
+}
+
+static inline int
+entrypoints_bpf__hid_free_inode__attach(struct entrypoints_bpf *skel)
+{
+ int prog_fd = skel->progs.hid_free_inode.prog_fd;
+ int fd = skel_raw_tracepoint_open(NULL, prog_fd);
+
+ if (fd > 0)
+ skel->links.hid_free_inode_fd = fd;
+ return fd;
+}
+
+static inline int
+entrypoints_bpf__attach(struct entrypoints_bpf *skel)
+{
+ int ret = 0;
+
+ ret = ret < 0 ? ret : entrypoints_bpf__hid_tail_call__attach(skel);
+ ret = ret < 0 ? ret : entrypoints_bpf__hid_prog_release__attach(skel);
+ ret = ret < 0 ? ret : entrypoints_bpf__hid_free_inode__attach(skel);
+ return ret < 0 ? ret : 0;
+}
+
+static inline void
+entrypoints_bpf__detach(struct entrypoints_bpf *skel)
+{
+ skel_closenz(skel->links.hid_tail_call_fd);
+ skel_closenz(skel->links.hid_prog_release_fd);
+ skel_closenz(skel->links.hid_free_inode_fd);
+}
+static void
+entrypoints_bpf__destroy(struct entrypoints_bpf *skel)
+{
+ if (!skel)
+ return;
+ entrypoints_bpf__detach(skel);
+ skel_closenz(skel->progs.hid_tail_call.prog_fd);
+ skel_closenz(skel->progs.hid_prog_release.prog_fd);
+ skel_closenz(skel->progs.hid_free_inode.prog_fd);
+ skel_closenz(skel->maps.hid_jmp_table.map_fd);
+ skel_closenz(skel->maps.progs_map.map_fd);
+ skel_free(skel);
+}
+static inline struct entrypoints_bpf *
+entrypoints_bpf__open(void)
+{
+ struct entrypoints_bpf *skel;
+
+ skel = skel_alloc(sizeof(*skel));
+ if (!skel)
+ goto cleanup;
+ skel->ctx.sz = (void *)&skel->links - (void *)skel;
+ return skel;
+cleanup:
+ entrypoints_bpf__destroy(skel);
+ return NULL;
+}
+
+static inline int
+entrypoints_bpf__load(struct entrypoints_bpf *skel)
+{
+ struct bpf_load_and_run_opts opts = {};
+ int err;
+
+ opts.ctx = (struct bpf_loader_ctx *)skel;
+ opts.data_sz = 10624;
+ opts.data = (void *)"\
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+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x62\x70\x66\x5f\x66\
+\x72\x65\x65\x5f\x69\x6e\x6f\x64\x65\0\0\x63\x61\x6c\x6c\x5f\x68\x69\x64\x5f\
+\x62\x70\x66\x5f\x70\x72\x6f\x67\x5f\x72\x65\x6c\x65\x61\x73\x65\0\0\0\0\0\0\0";
+ opts.insns_sz = 3152;
+ opts.insns = (void *)"\
+\xbf\x16\0\0\0\0\0\0\xbf\xa1\0\0\0\0\0\0\x07\x01\0\0\x78\xff\xff\xff\xb7\x02\0\
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+\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x01\0\0\0\0\0\0\xd5\x01\
+\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\x18\x60\0\0\0\0\0\0\0\0\
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+\x85\0\0\0\xa8\0\0\0\xbf\x70\0\0\0\0\0\0\x95\0\0\0\0\0\0\0\x61\x60\x08\0\0\0\0\
+\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x30\x23\0\0\x63\x01\0\0\0\0\0\0\x61\x60\x0c\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x2c\x23\0\0\x63\x01\0\0\0\0\0\0\x79\x60\x10\
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+\0\0\x63\x7a\x78\xff\0\0\0\0\x61\x60\x1c\0\0\0\0\0\x15\0\x03\0\0\0\0\0\x18\x61\
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+\0\x63\x71\0\0\0\0\0\0\x61\xa0\x78\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xb0\
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+\x62\0\0\0\0\0\0\0\0\0\0\x80\x23\0\0\xb7\x03\0\0\x48\0\0\0\x85\0\0\0\xa6\0\0\0\
+\xbf\x07\0\0\0\0\0\0\xc5\x07\xab\xff\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x04\0\
+\0\0\x63\x71\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xc8\x23\0\0\x18\x61\0\0\0\
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+\x23\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x58\x24\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\
+\0\0\0\0\0\0\0\0\0\x08\x24\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\xa0\x24\0\0\x7b\x01\
+\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x10\x24\0\0\x18\x61\0\0\0\0\0\0\0\0\0\
+\0\xb0\x24\0\0\x7b\x01\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x40\x24\0\0\x18\
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+\0\0\xc5\x07\x72\xff\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\x50\x24\0\0\x63\x70\
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+\0\x18\x62\0\0\0\0\0\0\0\0\0\0\x50\x24\0\0\xb7\x03\0\0\x8c\0\0\0\x85\0\0\0\xa6\
+\0\0\0\xbf\x07\0\0\0\0\0\0\x18\x60\0\0\0\0\0\0\0\0\0\0\xc0\x24\0\0\x61\x01\0\0\
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+\0\xc0\x26\0\0\x63\x01\0\0\0\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x08\x27\0\0\xb7\
+\x02\0\0\x11\0\0\0\xb7\x03\0\0\x0c\0\0\0\xb7\x04\0\0\0\0\0\0\x85\0\0\0\xa7\0\0\
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+\x26\0\0\x63\x70\x6c\0\0\0\0\0\x77\x07\0\0\x20\0\0\0\x63\x70\x70\0\0\0\0\0\x18\
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+\x08\x04\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x0a\0\0\0\0\0\x63\x78\x04\0\0\0\
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+\x09\x02\0\0\0\0\0\x6a\x08\x02\0\0\0\0\0\x05\0\x04\0\0\0\0\0\x18\x60\0\0\0\0\0\
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+\x01\0\0\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\
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+\0\0\xbf\x19\0\0\0\0\0\0\x85\0\0\0\xa8\0\0\0\xc5\x07\x92\xfe\0\0\0\0\x63\x7a\
+\x88\xff\0\0\0\0\x61\xa1\x78\xff\0\0\0\0\xd5\x01\x02\0\0\0\0\0\xbf\x19\0\0\0\0\
+\0\0\x85\0\0\0\xa8\0\0\0\x61\xa0\x80\xff\0\0\0\0\x63\x06\x38\0\0\0\0\0\x61\xa0\
+\x84\xff\0\0\0\0\x63\x06\x3c\0\0\0\0\0\x61\xa0\x88\xff\0\0\0\0\x63\x06\x40\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x18\0\0\
+\0\0\0\x18\x61\0\0\0\0\0\0\0\0\0\0\x04\0\0\0\x61\x10\0\0\0\0\0\0\x63\x06\x28\0\
+\0\0\0\0\xb7\0\0\0\0\0\0\0\x95\0\0\0\0\0\0\0";
+ err = bpf_load_and_run(&opts);
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+static inline struct entrypoints_bpf *
+entrypoints_bpf__open_and_load(void)
+{
+ struct entrypoints_bpf *skel;
+
+ skel = entrypoints_bpf__open();
+ if (!skel)
+ return NULL;
+ if (entrypoints_bpf__load(skel)) {
+ entrypoints_bpf__destroy(skel);
+ return NULL;
+ }
+ return skel;
+}
+
+__attribute__((unused)) static void
+entrypoints_bpf__assert(struct entrypoints_bpf *s __attribute__((unused)))
+{
+#ifdef __cplusplus
+#define _Static_assert static_assert
+#endif
+#ifdef __cplusplus
+#undef _Static_assert
+#endif
+}
+
+#endif /* __ENTRYPOINTS_BPF_SKEL_H__ */
new file mode 100644
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * HID-BPF support for Linux
+ *
+ * Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/bitops.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/filter.h>
+#include <linux/hid.h>
+#include <linux/hid_bpf.h>
+#include <linux/init.h>
+#include <linux/kfifo.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid_bpf_dispatch.h"
+#include "entrypoints/entrypoints.lskel.h"
+
+struct hid_bpf_ops *hid_bpf_ops;
+EXPORT_SYMBOL(hid_bpf_ops);
+
+/**
+ * hid_bpf_device_event - Called whenever an event is coming in from the device
+ *
+ * @ctx: The HID-BPF context
+ *
+ * @return %0 on success and keep processing; a negative error code to interrupt
+ * the processing of this event
+ *
+ * Declare an %fmod_ret tracing bpf program to this function and attach this
+ * program through hid_bpf_attach_prog() to have this helper called for
+ * any incoming event from the device itself.
+ *
+ * The function is called while on IRQ context, so we can not sleep.
+ */
+/* never used by the kernel but declared so we can load and attach a tracepoint */
+__weak noinline int hid_bpf_device_event(struct hid_bpf_ctx *ctx)
+{
+ return 0;
+}
+ALLOW_ERROR_INJECTION(hid_bpf_device_event, ERRNO);
+
+int
+dispatch_hid_bpf_device_event(struct hid_device *hdev, enum hid_report_type type, u8 *data,
+ u32 size, int interrupt)
+{
+ struct hid_bpf_ctx_kern ctx_kern = {
+ .ctx = {
+ .hid = hdev,
+ .report_type = type,
+ .size = size,
+ },
+ .data = data,
+ };
+
+ if (type >= HID_REPORT_TYPES)
+ return -EINVAL;
+
+ return hid_bpf_prog_run(hdev, HID_BPF_PROG_TYPE_DEVICE_EVENT, &ctx_kern);
+}
+EXPORT_SYMBOL_GPL(dispatch_hid_bpf_device_event);
+
+/**
+ * hid_bpf_get_data - Get the kernel memory pointer associated with the context @ctx
+ *
+ * @ctx: The HID-BPF context
+ * @offset: The offset within the memory
+ * @rdwr_buf_size: the const size of the buffer
+ *
+ * @returns %NULL on error, an %__u8 memory pointer on success
+ */
+noinline __u8 *
+hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t rdwr_buf_size)
+{
+ struct hid_bpf_ctx_kern *ctx_kern;
+
+ if (!ctx)
+ return NULL;
+
+ ctx_kern = container_of(ctx, struct hid_bpf_ctx_kern, ctx);
+
+ if (rdwr_buf_size + offset > ctx->size)
+ return NULL;
+
+ return ctx_kern->data + offset;
+}
+
+/*
+ * The following set contains all functions we agree BPF programs
+ * can use.
+ */
+BTF_SET8_START(hid_bpf_kfunc_ids)
+BTF_ID_FLAGS(func, call_hid_bpf_prog_release)
+BTF_ID_FLAGS(func, hid_bpf_get_data, KF_RET_NULL)
+BTF_SET8_END(hid_bpf_kfunc_ids)
+
+static const struct btf_kfunc_id_set hid_bpf_kfunc_set = {
+ .owner = THIS_MODULE,
+ .set = &hid_bpf_kfunc_ids,
+};
+
+static int device_match_id(struct device *dev, const void *id)
+{
+ struct hid_device *hdev = to_hid_device(dev);
+
+ return hdev->id == *(int *)id;
+}
+
+/**
+ * hid_bpf_attach_prog - Attach the given @prog_fd to the given HID device
+ *
+ * @hid_id: the system unique identifier of the HID device
+ * @prog_fd: an fd in the user process representing the program to attach
+ * @flags: any logical OR combination of &enum hid_bpf_attach_flags
+ *
+ * @returns %0 on success, an error code otherwise.
+ */
+/* called from syscall */
+noinline int
+hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags)
+{
+ struct hid_device *hdev;
+ struct device *dev;
+ int prog_type = hid_bpf_get_prog_attach_type(prog_fd);
+
+ if (!hid_bpf_ops)
+ return -EINVAL;
+
+ if (prog_type < 0)
+ return prog_type;
+
+ if (prog_type >= HID_BPF_PROG_TYPE_MAX)
+ return -EINVAL;
+
+ if ((flags & ~HID_BPF_FLAG_MASK))
+ return -EINVAL;
+
+ dev = bus_find_device(hid_bpf_ops->bus_type, NULL, &hid_id, device_match_id);
+ if (!dev)
+ return -EINVAL;
+
+ hdev = to_hid_device(dev);
+
+ return __hid_bpf_attach_prog(hdev, prog_type, prog_fd, flags);
+}
+
+/* for syscall HID-BPF */
+BTF_SET8_START(hid_bpf_syscall_kfunc_ids)
+BTF_ID_FLAGS(func, hid_bpf_attach_prog)
+BTF_SET8_END(hid_bpf_syscall_kfunc_ids)
+
+static const struct btf_kfunc_id_set hid_bpf_syscall_kfunc_set = {
+ .owner = THIS_MODULE,
+ .set = &hid_bpf_syscall_kfunc_ids,
+};
+
+void hid_bpf_destroy_device(struct hid_device *hdev)
+{
+ if (!hdev)
+ return;
+
+ /* mark the device as destroyed in bpf so we don't reattach it */
+ hdev->bpf.destroyed = true;
+
+ __hid_bpf_destroy_device(hdev);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_destroy_device);
+
+void hid_bpf_device_init(struct hid_device *hdev)
+{
+ spin_lock_init(&hdev->bpf.progs_lock);
+}
+EXPORT_SYMBOL_GPL(hid_bpf_device_init);
+
+static int __init hid_bpf_init(void)
+{
+ int err;
+
+ /* Note: if we exit with an error any time here, we would entirely break HID, which
+ * is probably not something we want. So we log an error and return success.
+ *
+ * This is not a big deal: the syscall allowing to attach a BPF program to a HID device
+ * will not be available, so nobody will be able to use the functionality.
+ */
+
+ err = register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &hid_bpf_kfunc_set);
+ if (err) {
+ pr_warn("error while setting HID BPF tracing kfuncs: %d", err);
+ return 0;
+ }
+
+ err = hid_bpf_preload_skel();
+ if (err) {
+ pr_warn("error while preloading HID BPF dispatcher: %d", err);
+ return 0;
+ }
+
+ /* register syscalls after we are sure we can load our preloaded bpf program */
+ err = register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &hid_bpf_syscall_kfunc_set);
+ if (err) {
+ pr_warn("error while setting HID BPF syscall kfuncs: %d", err);
+ return 0;
+ }
+
+ return 0;
+}
+
+static void __exit hid_bpf_exit(void)
+{
+ /* HID depends on us, so if we hit that code, we are guaranteed that hid
+ * has been removed and thus we do not need to clear the HID devices
+ */
+ hid_bpf_free_links_and_skel();
+}
+
+late_initcall(hid_bpf_init);
+module_exit(hid_bpf_exit);
+MODULE_AUTHOR("Benjamin Tissoires");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef _BPF_HID_BPF_DISPATCH_H
+#define _BPF_HID_BPF_DISPATCH_H
+
+#include <linux/hid.h>
+
+struct hid_bpf_ctx_kern {
+ struct hid_bpf_ctx ctx;
+ u8 *data;
+};
+
+int hid_bpf_preload_skel(void);
+void hid_bpf_free_links_and_skel(void);
+int hid_bpf_get_prog_attach_type(int prog_fd);
+int __hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type, int prog_fd,
+ __u32 flags);
+void __hid_bpf_destroy_device(struct hid_device *hdev);
+int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
+ struct hid_bpf_ctx_kern *ctx_kern);
+
+struct bpf_prog;
+
+/* HID-BPF internal kfuncs API */
+bool call_hid_bpf_prog_release(u64 prog, int table_cnt);
+
+#endif
new file mode 100644
@@ -0,0 +1,568 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+/*
+ * HID-BPF support for Linux
+ *
+ * Copyright (c) 2022 Benjamin Tissoires
+ */
+
+#include <linux/bitops.h>
+#include <linux/btf.h>
+#include <linux/btf_ids.h>
+#include <linux/circ_buf.h>
+#include <linux/filter.h>
+#include <linux/hid.h>
+#include <linux/hid_bpf.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/workqueue.h>
+#include "hid_bpf_dispatch.h"
+#include "entrypoints/entrypoints.lskel.h"
+
+#define HID_BPF_MAX_PROGS 1024 /* keep this in sync with preloaded bpf,
+ * needs to be a power of 2 as we use it as
+ * a circular buffer
+ */
+
+#define NEXT(idx) (((idx) + 1) & (HID_BPF_MAX_PROGS - 1))
+#define PREV(idx) (((idx) - 1) & (HID_BPF_MAX_PROGS - 1))
+
+/*
+ * represents one attached program stored in the hid jump table
+ */
+struct hid_bpf_prog_entry {
+ struct bpf_prog *prog;
+ struct hid_device *hdev;
+ enum hid_bpf_prog_type type;
+ u16 idx;
+};
+
+struct hid_bpf_jmp_table {
+ struct bpf_map *map;
+ struct bpf_map *prog_keys;
+ struct hid_bpf_prog_entry entries[HID_BPF_MAX_PROGS]; /* compacted list, circular buffer */
+ int tail, head;
+ struct bpf_prog *progs[HID_BPF_MAX_PROGS]; /* idx -> progs mapping */
+ unsigned long enabled[BITS_TO_LONGS(HID_BPF_MAX_PROGS)];
+};
+
+#define FOR_ENTRIES(__i, __start, __end) \
+ for (__i = __start; CIRC_CNT(__end, __i, HID_BPF_MAX_PROGS); __i = NEXT(__i))
+
+static struct hid_bpf_jmp_table jmp_table;
+
+static DEFINE_MUTEX(hid_bpf_attach_lock); /* held when attaching/detaching programs */
+
+static void hid_bpf_release_progs(struct work_struct *work);
+
+static DECLARE_WORK(release_work, hid_bpf_release_progs);
+
+BTF_ID_LIST(hid_bpf_btf_ids)
+BTF_ID(func, hid_bpf_device_event) /* HID_BPF_PROG_TYPE_DEVICE_EVENT */
+
+static int hid_bpf_max_programs(enum hid_bpf_prog_type type)
+{
+ switch (type) {
+ case HID_BPF_PROG_TYPE_DEVICE_EVENT:
+ return HID_BPF_MAX_PROGS_PER_DEV;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int hid_bpf_program_count(struct hid_device *hdev,
+ struct bpf_prog *prog,
+ enum hid_bpf_prog_type type)
+{
+ int i, n = 0;
+
+ if (type >= HID_BPF_PROG_TYPE_MAX)
+ return -EINVAL;
+
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+ if (type != HID_BPF_PROG_TYPE_UNDEF && entry->type != type)
+ continue;
+
+ if (hdev && entry->hdev != hdev)
+ continue;
+
+ if (prog && entry->prog != prog)
+ continue;
+
+ n++;
+ }
+
+ return n;
+}
+
+__weak noinline int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx)
+{
+ return 0;
+}
+ALLOW_ERROR_INJECTION(__hid_bpf_tail_call, ERRNO);
+
+int hid_bpf_prog_run(struct hid_device *hdev, enum hid_bpf_prog_type type,
+ struct hid_bpf_ctx_kern *ctx_kern)
+{
+ struct hid_bpf_prog_list *prog_list;
+ int i, idx, err = 0;
+
+ rcu_read_lock();
+ prog_list = rcu_dereference(hdev->bpf.progs[type]);
+
+ if (!prog_list)
+ goto out_unlock;
+
+ for (i = 0; i < prog_list->prog_cnt; i++) {
+ idx = prog_list->prog_idx[i];
+
+ if (!test_bit(idx, jmp_table.enabled))
+ continue;
+
+ ctx_kern->ctx.index = idx;
+ err = __hid_bpf_tail_call(&ctx_kern->ctx);
+ if (err)
+ break;
+ }
+
+ out_unlock:
+ rcu_read_unlock();
+
+ return err;
+}
+
+/*
+ * assign the list of programs attached to a given hid device.
+ */
+static void __hid_bpf_set_hdev_progs(struct hid_device *hdev, struct hid_bpf_prog_list *new_list,
+ enum hid_bpf_prog_type type)
+{
+ struct hid_bpf_prog_list *old_list;
+
+ spin_lock(&hdev->bpf.progs_lock);
+ old_list = rcu_dereference_protected(hdev->bpf.progs[type],
+ lockdep_is_held(&hdev->bpf.progs_lock));
+ rcu_assign_pointer(hdev->bpf.progs[type], new_list);
+ spin_unlock(&hdev->bpf.progs_lock);
+ synchronize_rcu();
+
+ kfree(old_list);
+}
+
+/*
+ * allocate and populate the list of programs attached to a given hid device.
+ *
+ * Must be called under lock.
+ */
+static int hid_bpf_populate_hdev(struct hid_device *hdev, enum hid_bpf_prog_type type)
+{
+ struct hid_bpf_prog_list *new_list;
+ int i;
+
+ if (type >= HID_BPF_PROG_TYPE_MAX || !hdev)
+ return -EINVAL;
+
+ if (hdev->bpf.destroyed)
+ return 0;
+
+ new_list = kzalloc(sizeof(*new_list), GFP_KERNEL);
+ if (!new_list)
+ return -ENOMEM;
+
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+ if (entry->type == type && entry->hdev == hdev &&
+ test_bit(entry->idx, jmp_table.enabled))
+ new_list->prog_idx[new_list->prog_cnt++] = entry->idx;
+ }
+
+ __hid_bpf_set_hdev_progs(hdev, new_list, type);
+
+ return 0;
+}
+
+static void __hid_bpf_do_release_prog(int map_fd, unsigned int idx)
+{
+ skel_map_delete_elem(map_fd, &idx);
+ jmp_table.progs[idx] = NULL;
+}
+
+static void hid_bpf_release_progs(struct work_struct *work)
+{
+ int i, j, n, map_fd = -1;
+
+ if (!jmp_table.map)
+ return;
+
+ /* retrieve a fd of our prog_array map in BPF */
+ map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+ if (map_fd < 0)
+ return;
+
+ mutex_lock(&hid_bpf_attach_lock); /* protects against attaching new programs */
+
+ /* detach unused progs from HID devices */
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+ enum hid_bpf_prog_type type;
+ struct hid_device *hdev;
+
+ if (test_bit(entry->idx, jmp_table.enabled))
+ continue;
+
+ /* we have an attached prog */
+ if (entry->hdev) {
+ hdev = entry->hdev;
+ type = entry->type;
+
+ hid_bpf_populate_hdev(hdev, type);
+
+ /* mark all other disabled progs from hdev of the given type as detached */
+ FOR_ENTRIES(j, i, jmp_table.head) {
+ struct hid_bpf_prog_entry *next;
+
+ next = &jmp_table.entries[j];
+
+ if (test_bit(next->idx, jmp_table.enabled))
+ continue;
+
+ if (next->hdev == hdev && next->type == type)
+ next->hdev = NULL;
+ }
+ }
+ }
+
+ /* remove all unused progs from the jump table */
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+ if (test_bit(entry->idx, jmp_table.enabled))
+ continue;
+
+ if (entry->prog)
+ __hid_bpf_do_release_prog(map_fd, entry->idx);
+ }
+
+ /* compact the entry list */
+ n = jmp_table.tail;
+ FOR_ENTRIES(i, jmp_table.tail, jmp_table.head) {
+ struct hid_bpf_prog_entry *entry = &jmp_table.entries[i];
+
+ if (!test_bit(entry->idx, jmp_table.enabled))
+ continue;
+
+ jmp_table.entries[n] = jmp_table.entries[i];
+ n = NEXT(n);
+ }
+
+ jmp_table.head = n;
+
+ mutex_unlock(&hid_bpf_attach_lock);
+
+ if (map_fd >= 0)
+ close_fd(map_fd);
+}
+
+static void hid_bpf_release_prog_at(int idx)
+{
+ int map_fd = -1;
+
+ /* retrieve a fd of our prog_array map in BPF */
+ map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+ if (map_fd < 0)
+ return;
+
+ __hid_bpf_do_release_prog(map_fd, idx);
+
+ close(map_fd);
+}
+
+/*
+ * Insert the given BPF program represented by its fd in the jmp table.
+ * Returns the index in the jump table or a negative error.
+ */
+static int hid_bpf_insert_prog(int prog_fd, struct bpf_prog *prog)
+{
+ int i, cnt, index = -1, map_fd = -1, progs_map_fd = -1, err = -EINVAL;
+
+ /* retrieve a fd of our prog_array map in BPF */
+ map_fd = skel_map_get_fd_by_id(jmp_table.map->id);
+ /* take an fd for the table of progs we monitor with SEC("fexit/bpf_prog_release") */
+ progs_map_fd = skel_map_get_fd_by_id(jmp_table.prog_keys->id);
+
+ if (map_fd < 0 || progs_map_fd < 0) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ cnt = 0;
+ /* find the first available index in the jmp_table
+ * and count how many time this program has been inserted
+ */
+ for (i = 0; i < HID_BPF_MAX_PROGS; i++) {
+ if (!jmp_table.progs[i] && index < 0) {
+ /* mark the index as used */
+ jmp_table.progs[i] = prog;
+ index = i;
+ __set_bit(i, jmp_table.enabled);
+ cnt++;
+ } else {
+ if (jmp_table.progs[i] == prog)
+ cnt++;
+ }
+ }
+ if (index < 0) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /* insert the program in the jump table */
+ err = skel_map_update_elem(map_fd, &index, &prog_fd, 0);
+ if (err)
+ goto out;
+
+ /* insert the program in the prog list table */
+ err = skel_map_update_elem(progs_map_fd, &prog, &cnt, 0);
+ if (err)
+ goto out;
+
+ /* return the index */
+ err = index;
+
+ out:
+ if (err < 0)
+ __hid_bpf_do_release_prog(map_fd, index);
+ if (map_fd >= 0)
+ close_fd(map_fd);
+ if (progs_map_fd >= 0)
+ close_fd(progs_map_fd);
+ return err;
+}
+
+int hid_bpf_get_prog_attach_type(int prog_fd)
+{
+ struct bpf_prog *prog = NULL;
+ int i;
+ int prog_type = HID_BPF_PROG_TYPE_UNDEF;
+
+ prog = bpf_prog_get(prog_fd);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ for (i = 0; i < HID_BPF_PROG_TYPE_MAX; i++) {
+ if (hid_bpf_btf_ids[i] == prog->aux->attach_btf_id) {
+ prog_type = i;
+ break;
+ }
+ }
+
+ bpf_prog_put(prog);
+
+ return prog_type;
+}
+
+/* called from syscall */
+noinline int
+__hid_bpf_attach_prog(struct hid_device *hdev, enum hid_bpf_prog_type prog_type,
+ int prog_fd, __u32 flags)
+{
+ struct bpf_prog *prog = NULL;
+ struct hid_bpf_prog_entry *prog_entry;
+ int cnt, err = -EINVAL, prog_idx = -1;
+
+ /* take a ref on the prog itself */
+ prog = bpf_prog_get(prog_fd);
+ if (IS_ERR(prog))
+ return PTR_ERR(prog);
+
+ mutex_lock(&hid_bpf_attach_lock);
+
+ /* do not attach too many programs to a given HID device */
+ cnt = hid_bpf_program_count(hdev, NULL, prog_type);
+ if (cnt < 0) {
+ err = cnt;
+ goto out_unlock;
+ }
+
+ if (cnt >= hid_bpf_max_programs(prog_type)) {
+ err = -E2BIG;
+ goto out_unlock;
+ }
+
+ prog_idx = hid_bpf_insert_prog(prog_fd, prog);
+ /* if the jmp table is full, abort */
+ if (prog_idx < 0) {
+ err = prog_idx;
+ goto out_unlock;
+ }
+
+ if (flags & HID_BPF_FLAG_INSERT_HEAD) {
+ /* take the previous prog_entry slot */
+ jmp_table.tail = PREV(jmp_table.tail);
+ prog_entry = &jmp_table.entries[jmp_table.tail];
+ } else {
+ /* take the next prog_entry slot */
+ prog_entry = &jmp_table.entries[jmp_table.head];
+ jmp_table.head = NEXT(jmp_table.head);
+ }
+
+ /* we steal the ref here */
+ prog_entry->prog = prog;
+ prog_entry->idx = prog_idx;
+ prog_entry->hdev = hdev;
+ prog_entry->type = prog_type;
+
+ /* finally store the index in the device list */
+ err = hid_bpf_populate_hdev(hdev, prog_type);
+ if (err)
+ hid_bpf_release_prog_at(prog_idx);
+
+ out_unlock:
+ mutex_unlock(&hid_bpf_attach_lock);
+
+ /* we only use prog as a key in the various tables, so we don't need to actually
+ * increment the ref count.
+ */
+ bpf_prog_put(prog);
+
+ return err;
+}
+
+void __hid_bpf_destroy_device(struct hid_device *hdev)
+{
+ int type, i;
+ struct hid_bpf_prog_list *prog_list;
+
+ rcu_read_lock();
+
+ for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++) {
+ prog_list = rcu_dereference(hdev->bpf.progs[type]);
+
+ if (!prog_list)
+ continue;
+
+ for (i = 0; i < prog_list->prog_cnt; i++)
+ __clear_bit(prog_list->prog_idx[i], jmp_table.enabled);
+ }
+
+ rcu_read_unlock();
+
+ for (type = 0; type < HID_BPF_PROG_TYPE_MAX; type++)
+ __hid_bpf_set_hdev_progs(hdev, NULL, type);
+
+ /* schedule release of all detached progs */
+ schedule_work(&release_work);
+}
+
+noinline bool
+call_hid_bpf_prog_release(u64 prog_key, int table_cnt)
+{
+ /* compare with how many refs are left in the bpf program */
+ struct bpf_prog *prog = (struct bpf_prog *)prog_key;
+ int idx;
+
+ if (!prog)
+ return false;
+
+ if (atomic64_read(&prog->aux->refcnt) != table_cnt)
+ return false;
+
+ /* we don't need locking here because the entries in the progs table
+ * are stable:
+ * if there are other users (and the progs entries might change), we
+ * would return in the statement above.
+ */
+ for (idx = 0; idx < HID_BPF_MAX_PROGS; idx++) {
+ if (jmp_table.progs[idx] == prog) {
+ __clear_bit(idx, jmp_table.enabled);
+ break;
+ }
+ }
+ if (idx >= HID_BPF_MAX_PROGS) {
+ /* should never happen if we get our refcount right */
+ idx = -1;
+ }
+
+ /* schedule release of all detached progs */
+ schedule_work(&release_work);
+ return idx >= 0;
+}
+
+#define HID_BPF_PROGS_COUNT 3
+
+static struct bpf_link *links[HID_BPF_PROGS_COUNT];
+static struct entrypoints_bpf *skel;
+
+void hid_bpf_free_links_and_skel(void)
+{
+ int i;
+
+ /* the following is enough to release all programs attached to hid */
+ if (jmp_table.prog_keys)
+ bpf_map_put_with_uref(jmp_table.prog_keys);
+
+ if (jmp_table.map)
+ bpf_map_put_with_uref(jmp_table.map);
+
+ for (i = 0; i < ARRAY_SIZE(links); i++) {
+ if (!IS_ERR_OR_NULL(links[i]))
+ bpf_link_put(links[i]);
+ }
+ entrypoints_bpf__destroy(skel);
+}
+
+#define ATTACH_AND_STORE_LINK(__name) do { \
+ err = entrypoints_bpf__##__name##__attach(skel); \
+ if (err) \
+ goto out; \
+ \
+ links[idx] = bpf_link_get_from_fd(skel->links.__name##_fd); \
+ if (IS_ERR(links[idx])) { \
+ err = PTR_ERR(links[idx]); \
+ goto out; \
+ } \
+ \
+ /* Avoid taking over stdin/stdout/stderr of init process. Zeroing out \
+ * makes skel_closenz() a no-op later in iterators_bpf__destroy(). \
+ */ \
+ close_fd(skel->links.__name##_fd); \
+ skel->links.__name##_fd = 0; \
+ idx++; \
+} while (0)
+
+int hid_bpf_preload_skel(void)
+{
+ int err, idx = 0;
+
+ skel = entrypoints_bpf__open();
+ if (!skel)
+ return -ENOMEM;
+
+ err = entrypoints_bpf__load(skel);
+ if (err)
+ goto out;
+
+ jmp_table.map = bpf_map_get_with_uref(skel->maps.hid_jmp_table.map_fd);
+ if (IS_ERR(jmp_table.map)) {
+ err = PTR_ERR(jmp_table.map);
+ goto out;
+ }
+
+ jmp_table.prog_keys = bpf_map_get_with_uref(skel->maps.progs_map.map_fd);
+ if (IS_ERR(jmp_table.prog_keys)) {
+ err = PTR_ERR(jmp_table.prog_keys);
+ goto out;
+ }
+
+ ATTACH_AND_STORE_LINK(hid_tail_call);
+ ATTACH_AND_STORE_LINK(hid_prog_release);
+ ATTACH_AND_STORE_LINK(hid_free_inode);
+
+ return 0;
+out:
+ hid_bpf_free_links_and_skel();
+ return err;
+}
@@ -2040,6 +2040,10 @@ int hid_input_report(struct hid_device *hid, enum hid_report_type type, u8 *data
report_enum = hid->report_enum + type;
hdrv = hid->driver;
+ ret = dispatch_hid_bpf_device_event(hid, type, data, size, interrupt);
+ if (ret)
+ goto unlock;
+
if (!size) {
dbg_hid("empty report\n");
ret = -1;
@@ -2790,6 +2794,8 @@ struct hid_device *hid_allocate_device(void)
sema_init(&hdev->driver_input_lock, 1);
mutex_init(&hdev->ll_open_lock);
+ hid_bpf_device_init(hdev);
+
return hdev;
}
EXPORT_SYMBOL_GPL(hid_allocate_device);
@@ -2816,6 +2822,7 @@ static void hid_remove_device(struct hid_device *hdev)
*/
void hid_destroy_device(struct hid_device *hdev)
{
+ hid_bpf_destroy_device(hdev);
hid_remove_device(hdev);
put_device(&hdev->dev);
}
@@ -2902,6 +2909,13 @@ int hid_check_keys_pressed(struct hid_device *hid)
}
EXPORT_SYMBOL_GPL(hid_check_keys_pressed);
+#ifdef CONFIG_HID_BPF
+static struct hid_bpf_ops hid_ops = {
+ .owner = THIS_MODULE,
+ .bus_type = &hid_bus_type,
+};
+#endif
+
static int __init hid_init(void)
{
int ret;
@@ -2916,6 +2930,10 @@ static int __init hid_init(void)
goto err;
}
+#ifdef CONFIG_HID_BPF
+ hid_bpf_ops = &hid_ops;
+#endif
+
ret = hidraw_init();
if (ret)
goto err_bus;
@@ -2931,6 +2949,9 @@ static int __init hid_init(void)
static void __exit hid_exit(void)
{
+#ifdef CONFIG_HID_BPF
+ hid_bpf_ops = NULL;
+#endif
hid_debug_exit();
hidraw_exit();
bus_unregister(&hid_bus_type);
@@ -26,6 +26,7 @@
#include <linux/mutex.h>
#include <linux/power_supply.h>
#include <uapi/linux/hid.h>
+#include <linux/hid_bpf.h>
/*
* We parse each description item into this structure. Short items data
@@ -651,6 +652,10 @@ struct hid_device { /* device report descriptor */
wait_queue_head_t debug_wait;
unsigned int id; /* system unique id */
+
+#ifdef CONFIG_BPF
+ struct hid_bpf bpf; /* hid-bpf data */
+#endif /* CONFIG_BPF */
};
#define to_hid_device(pdev) \
new file mode 100644
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+
+#ifndef __HID_BPF_H
+#define __HID_BPF_H
+
+#include <linux/spinlock.h>
+#include <uapi/linux/hid.h>
+
+struct hid_device;
+
+/*
+ * The following is the user facing HID BPF API.
+ *
+ * Extra care should be taken when editing this part, as
+ * it might break existing out of the tree bpf programs.
+ */
+
+/**
+ * struct hid_bpf_ctx - User accessible data for all HID programs
+ *
+ * ``data`` is not directly accessible from the context. We need to issue
+ * a call to ``hid_bpf_get_data()`` in order to get a pointer to that field.
+ *
+ * All of these fields are currently read-only.
+ *
+ * @index: program index in the jump table. No special meaning (a smaller index
+ * doesn't mean the program will be executed before another program with
+ * a bigger index).
+ * @hid: the ``struct hid_device`` representing the device itself
+ * @report_type: used for ``hid_bpf_device_event()``
+ * @size: Valid data in the data field.
+ *
+ * Programs can get the available valid size in data by fetching this field.
+ */
+struct hid_bpf_ctx {
+ __u32 index;
+ const struct hid_device *hid;
+ enum hid_report_type report_type;
+ __s32 size;
+};
+
+/**
+ * enum hid_bpf_attach_flags - flags used when attaching a HIF-BPF program
+ *
+ * @HID_BPF_FLAG_NONE: no specific flag is used, the kernel choses where to
+ * insert the program
+ * @HID_BPF_FLAG_INSERT_HEAD: insert the given program before any other program
+ * currently attached to the device. This doesn't
+ * guarantee that this program will always be first
+ * @HID_BPF_FLAG_MAX: sentinel value, not to be used by the callers
+ */
+enum hid_bpf_attach_flags {
+ HID_BPF_FLAG_NONE = 0,
+ HID_BPF_FLAG_INSERT_HEAD = _BITUL(0),
+ HID_BPF_FLAG_MAX,
+};
+
+/* Following functions are tracepoints that BPF programs can attach to */
+int hid_bpf_device_event(struct hid_bpf_ctx *ctx);
+
+/* Following functions are kfunc that we export to BPF programs */
+/* only available in tracing */
+__u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx, unsigned int offset, const size_t __sz);
+
+/* only available in syscall */
+int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, __u32 flags);
+
+/*
+ * Below is HID internal
+ */
+
+/* internal function to call eBPF programs, not to be used by anybody */
+int __hid_bpf_tail_call(struct hid_bpf_ctx *ctx);
+
+#define HID_BPF_MAX_PROGS_PER_DEV 64
+#define HID_BPF_FLAG_MASK (((HID_BPF_FLAG_MAX - 1) << 1) - 1)
+
+/* types of HID programs to attach to */
+enum hid_bpf_prog_type {
+ HID_BPF_PROG_TYPE_UNDEF = -1,
+ HID_BPF_PROG_TYPE_DEVICE_EVENT, /* an event is emitted from the device */
+ HID_BPF_PROG_TYPE_MAX,
+};
+
+struct hid_bpf_ops {
+ struct module *owner;
+ struct bus_type *bus_type;
+};
+
+extern struct hid_bpf_ops *hid_bpf_ops;
+
+struct hid_bpf_prog_list {
+ u16 prog_idx[HID_BPF_MAX_PROGS_PER_DEV];
+ u8 prog_cnt;
+};
+
+/* stored in each device */
+struct hid_bpf {
+ struct hid_bpf_prog_list __rcu *progs[HID_BPF_PROG_TYPE_MAX]; /* attached BPF progs */
+ bool destroyed; /* prevents the assignment of any progs */
+
+ spinlock_t progs_lock; /* protects RCU update of progs */
+};
+
+#ifdef CONFIG_HID_BPF
+int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type, u8 *data,
+ u32 size, int interrupt);
+void hid_bpf_destroy_device(struct hid_device *hid);
+void hid_bpf_device_init(struct hid_device *hid);
+#else /* CONFIG_HID_BPF */
+static inline int dispatch_hid_bpf_device_event(struct hid_device *hid, enum hid_report_type type,
+ u8 *data, u32 size, int interrupt) { return 0; }
+static inline void hid_bpf_destroy_device(struct hid_device *hid) {}
+static inline void hid_bpf_device_init(struct hid_device *hid) {}
+#endif /* CONFIG_HID_BPF */
+
+#endif /* __HID_BPF_H */