media: rc: introduce BPF_PROG_LIRC_MODE2
Add support for BPF_PROG_LIRC_MODE2. This type of BPF program can call rc_keydown() to reported decoded IR scancodes, or rc_repeat() to report that the last key should be repeated. The bpf program can be attached to using the bpf(BPF_PROG_ATTACH) syscall; the target_fd must be the /dev/lircN device. Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>zero-colors
Sean Young
Daniel Borkmann
parent
170a7e3ea0
commit
f4364dcfc8
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@ -25,6 +25,19 @@ config LIRC
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passes raw IR to and from userspace, which is needed for
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IR transmitting (aka "blasting") and for the lirc daemon.
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config BPF_LIRC_MODE2
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bool "Support for eBPF programs attached to lirc devices"
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depends on BPF_SYSCALL
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depends on RC_CORE=y
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depends on LIRC
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help
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Allow attaching eBPF programs to a lirc device using the bpf(2)
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syscall command BPF_PROG_ATTACH. This is supported for raw IR
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receivers.
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These eBPF programs can be used to decode IR into scancodes, for
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IR protocols not supported by the kernel decoders.
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menuconfig RC_DECODERS
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bool "Remote controller decoders"
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depends on RC_CORE
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@ -5,6 +5,7 @@ obj-y += keymaps/
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obj-$(CONFIG_RC_CORE) += rc-core.o
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rc-core-y := rc-main.o rc-ir-raw.o
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rc-core-$(CONFIG_LIRC) += lirc_dev.o
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rc-core-$(CONFIG_BPF_LIRC_MODE2) += bpf-lirc.o
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obj-$(CONFIG_IR_NEC_DECODER) += ir-nec-decoder.o
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obj-$(CONFIG_IR_RC5_DECODER) += ir-rc5-decoder.o
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obj-$(CONFIG_IR_RC6_DECODER) += ir-rc6-decoder.o
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@ -0,0 +1,313 @@
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// SPDX-License-Identifier: GPL-2.0
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// bpf-lirc.c - handles bpf
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//
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// Copyright (C) 2018 Sean Young <sean@mess.org>
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#include <linux/bpf.h>
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#include <linux/filter.h>
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#include <linux/bpf_lirc.h>
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#include "rc-core-priv.h"
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/*
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* BPF interface for raw IR
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*/
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const struct bpf_prog_ops lirc_mode2_prog_ops = {
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};
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BPF_CALL_1(bpf_rc_repeat, u32*, sample)
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{
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struct ir_raw_event_ctrl *ctrl;
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ctrl = container_of(sample, struct ir_raw_event_ctrl, bpf_sample);
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rc_repeat(ctrl->dev);
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return 0;
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}
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static const struct bpf_func_proto rc_repeat_proto = {
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.func = bpf_rc_repeat,
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.gpl_only = true, /* rc_repeat is EXPORT_SYMBOL_GPL */
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.ret_type = RET_INTEGER,
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.arg1_type = ARG_PTR_TO_CTX,
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};
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/*
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* Currently rc-core does not support 64-bit scancodes, but there are many
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* known protocols with more than 32 bits. So, define the interface as u64
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* as a future-proof.
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*/
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BPF_CALL_4(bpf_rc_keydown, u32*, sample, u32, protocol, u64, scancode,
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u32, toggle)
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{
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struct ir_raw_event_ctrl *ctrl;
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ctrl = container_of(sample, struct ir_raw_event_ctrl, bpf_sample);
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rc_keydown(ctrl->dev, protocol, scancode, toggle != 0);
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return 0;
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}
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static const struct bpf_func_proto rc_keydown_proto = {
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.func = bpf_rc_keydown,
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.gpl_only = true, /* rc_keydown is EXPORT_SYMBOL_GPL */
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.ret_type = RET_INTEGER,
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.arg1_type = ARG_PTR_TO_CTX,
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.arg2_type = ARG_ANYTHING,
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.arg3_type = ARG_ANYTHING,
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.arg4_type = ARG_ANYTHING,
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};
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static const struct bpf_func_proto *
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lirc_mode2_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
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{
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switch (func_id) {
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case BPF_FUNC_rc_repeat:
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return &rc_repeat_proto;
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case BPF_FUNC_rc_keydown:
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return &rc_keydown_proto;
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case BPF_FUNC_map_lookup_elem:
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return &bpf_map_lookup_elem_proto;
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case BPF_FUNC_map_update_elem:
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return &bpf_map_update_elem_proto;
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case BPF_FUNC_map_delete_elem:
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return &bpf_map_delete_elem_proto;
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case BPF_FUNC_ktime_get_ns:
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return &bpf_ktime_get_ns_proto;
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case BPF_FUNC_tail_call:
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return &bpf_tail_call_proto;
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case BPF_FUNC_get_prandom_u32:
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return &bpf_get_prandom_u32_proto;
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case BPF_FUNC_trace_printk:
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if (capable(CAP_SYS_ADMIN))
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return bpf_get_trace_printk_proto();
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/* fall through */
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default:
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return NULL;
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}
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}
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static bool lirc_mode2_is_valid_access(int off, int size,
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enum bpf_access_type type,
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const struct bpf_prog *prog,
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struct bpf_insn_access_aux *info)
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{
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/* We have one field of u32 */
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return type == BPF_READ && off == 0 && size == sizeof(u32);
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}
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const struct bpf_verifier_ops lirc_mode2_verifier_ops = {
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.get_func_proto = lirc_mode2_func_proto,
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.is_valid_access = lirc_mode2_is_valid_access
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};
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#define BPF_MAX_PROGS 64
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static int lirc_bpf_attach(struct rc_dev *rcdev, struct bpf_prog *prog)
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{
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struct bpf_prog_array __rcu *old_array;
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struct bpf_prog_array *new_array;
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struct ir_raw_event_ctrl *raw;
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int ret;
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if (rcdev->driver_type != RC_DRIVER_IR_RAW)
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return -EINVAL;
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ret = mutex_lock_interruptible(&ir_raw_handler_lock);
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if (ret)
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return ret;
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raw = rcdev->raw;
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if (!raw) {
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ret = -ENODEV;
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goto unlock;
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}
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if (raw->progs && bpf_prog_array_length(raw->progs) >= BPF_MAX_PROGS) {
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ret = -E2BIG;
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goto unlock;
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}
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old_array = raw->progs;
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ret = bpf_prog_array_copy(old_array, NULL, prog, &new_array);
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if (ret < 0)
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goto unlock;
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rcu_assign_pointer(raw->progs, new_array);
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bpf_prog_array_free(old_array);
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unlock:
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mutex_unlock(&ir_raw_handler_lock);
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return ret;
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}
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static int lirc_bpf_detach(struct rc_dev *rcdev, struct bpf_prog *prog)
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{
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struct bpf_prog_array __rcu *old_array;
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struct bpf_prog_array *new_array;
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struct ir_raw_event_ctrl *raw;
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int ret;
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if (rcdev->driver_type != RC_DRIVER_IR_RAW)
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return -EINVAL;
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ret = mutex_lock_interruptible(&ir_raw_handler_lock);
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if (ret)
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return ret;
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raw = rcdev->raw;
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if (!raw) {
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ret = -ENODEV;
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goto unlock;
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}
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old_array = raw->progs;
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ret = bpf_prog_array_copy(old_array, prog, NULL, &new_array);
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/*
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* Do not use bpf_prog_array_delete_safe() as we would end up
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* with a dummy entry in the array, and the we would free the
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* dummy in lirc_bpf_free()
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*/
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if (ret)
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goto unlock;
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rcu_assign_pointer(raw->progs, new_array);
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bpf_prog_array_free(old_array);
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unlock:
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mutex_unlock(&ir_raw_handler_lock);
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return ret;
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}
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void lirc_bpf_run(struct rc_dev *rcdev, u32 sample)
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{
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struct ir_raw_event_ctrl *raw = rcdev->raw;
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raw->bpf_sample = sample;
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if (raw->progs)
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BPF_PROG_RUN_ARRAY(raw->progs, &raw->bpf_sample, BPF_PROG_RUN);
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}
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/*
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* This should be called once the rc thread has been stopped, so there can be
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* no concurrent bpf execution.
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*/
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void lirc_bpf_free(struct rc_dev *rcdev)
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{
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struct bpf_prog **progs;
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if (!rcdev->raw->progs)
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return;
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progs = rcu_dereference(rcdev->raw->progs)->progs;
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while (*progs)
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bpf_prog_put(*progs++);
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bpf_prog_array_free(rcdev->raw->progs);
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}
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int lirc_prog_attach(const union bpf_attr *attr)
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{
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struct bpf_prog *prog;
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struct rc_dev *rcdev;
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int ret;
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if (attr->attach_flags)
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return -EINVAL;
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prog = bpf_prog_get_type(attr->attach_bpf_fd,
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BPF_PROG_TYPE_LIRC_MODE2);
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if (IS_ERR(prog))
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return PTR_ERR(prog);
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rcdev = rc_dev_get_from_fd(attr->target_fd);
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if (IS_ERR(rcdev)) {
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bpf_prog_put(prog);
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return PTR_ERR(rcdev);
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}
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ret = lirc_bpf_attach(rcdev, prog);
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if (ret)
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bpf_prog_put(prog);
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put_device(&rcdev->dev);
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return ret;
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}
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int lirc_prog_detach(const union bpf_attr *attr)
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{
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struct bpf_prog *prog;
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struct rc_dev *rcdev;
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int ret;
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if (attr->attach_flags)
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return -EINVAL;
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prog = bpf_prog_get_type(attr->attach_bpf_fd,
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BPF_PROG_TYPE_LIRC_MODE2);
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if (IS_ERR(prog))
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return PTR_ERR(prog);
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rcdev = rc_dev_get_from_fd(attr->target_fd);
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if (IS_ERR(rcdev)) {
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bpf_prog_put(prog);
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return PTR_ERR(rcdev);
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}
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ret = lirc_bpf_detach(rcdev, prog);
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bpf_prog_put(prog);
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put_device(&rcdev->dev);
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return ret;
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}
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int lirc_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr)
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{
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__u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
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struct bpf_prog_array __rcu *progs;
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struct rc_dev *rcdev;
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u32 cnt, flags = 0;
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int ret;
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if (attr->query.query_flags)
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return -EINVAL;
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rcdev = rc_dev_get_from_fd(attr->query.target_fd);
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if (IS_ERR(rcdev))
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return PTR_ERR(rcdev);
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if (rcdev->driver_type != RC_DRIVER_IR_RAW) {
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ret = -EINVAL;
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goto put;
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}
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ret = mutex_lock_interruptible(&ir_raw_handler_lock);
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if (ret)
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goto put;
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progs = rcdev->raw->progs;
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cnt = progs ? bpf_prog_array_length(progs) : 0;
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if (copy_to_user(&uattr->query.prog_cnt, &cnt, sizeof(cnt))) {
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ret = -EFAULT;
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goto unlock;
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}
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if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags))) {
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ret = -EFAULT;
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goto unlock;
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}
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if (attr->query.prog_cnt != 0 && prog_ids && cnt)
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ret = bpf_prog_array_copy_to_user(progs, prog_ids, cnt);
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unlock:
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mutex_unlock(&ir_raw_handler_lock);
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put:
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put_device(&rcdev->dev);
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return ret;
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}
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@ -20,6 +20,7 @@
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/file.h>
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#include <linux/idr.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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@ -104,6 +105,12 @@ void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
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TO_US(ev.duration), TO_STR(ev.pulse));
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}
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/*
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* bpf does not care about the gap generated above; that exists
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* for backwards compatibility
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*/
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lirc_bpf_run(dev, sample);
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spin_lock_irqsave(&dev->lirc_fh_lock, flags);
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list_for_each_entry(fh, &dev->lirc_fh, list) {
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if (LIRC_IS_TIMEOUT(sample) && !fh->send_timeout_reports)
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@ -816,4 +823,27 @@ void __exit lirc_dev_exit(void)
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unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
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}
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struct rc_dev *rc_dev_get_from_fd(int fd)
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{
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struct fd f = fdget(fd);
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struct lirc_fh *fh;
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struct rc_dev *dev;
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if (!f.file)
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return ERR_PTR(-EBADF);
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if (f.file->f_op != &lirc_fops) {
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fdput(f);
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return ERR_PTR(-EINVAL);
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}
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fh = f.file->private_data;
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dev = fh->rc;
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get_device(&dev->dev);
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fdput(f);
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return dev;
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}
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MODULE_ALIAS("lirc_dev");
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@ -13,6 +13,7 @@
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#define MAX_IR_EVENT_SIZE 512
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#include <linux/slab.h>
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#include <uapi/linux/bpf.h>
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#include <media/rc-core.h>
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/**
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@ -57,6 +58,11 @@ struct ir_raw_event_ctrl {
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/* raw decoder state follows */
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struct ir_raw_event prev_ev;
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struct ir_raw_event this_ev;
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#ifdef CONFIG_BPF_LIRC_MODE2
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u32 bpf_sample;
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struct bpf_prog_array __rcu *progs;
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#endif
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struct nec_dec {
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int state;
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unsigned count;
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@ -126,6 +132,9 @@ struct ir_raw_event_ctrl {
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} imon;
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};
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/* Mutex for locking raw IR processing and handler change */
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extern struct mutex ir_raw_handler_lock;
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/* macros for IR decoders */
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static inline bool geq_margin(unsigned d1, unsigned d2, unsigned margin)
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{
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@ -288,6 +297,7 @@ void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev);
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void ir_lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc);
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int ir_lirc_register(struct rc_dev *dev);
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void ir_lirc_unregister(struct rc_dev *dev);
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struct rc_dev *rc_dev_get_from_fd(int fd);
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#else
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static inline int lirc_dev_init(void) { return 0; }
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static inline void lirc_dev_exit(void) {}
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@ -299,4 +309,15 @@ static inline int ir_lirc_register(struct rc_dev *dev) { return 0; }
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static inline void ir_lirc_unregister(struct rc_dev *dev) { }
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#endif
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/*
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* bpf interface
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*/
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#ifdef CONFIG_BPF_LIRC_MODE2
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void lirc_bpf_free(struct rc_dev *dev);
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void lirc_bpf_run(struct rc_dev *dev, u32 sample);
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#else
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static inline void lirc_bpf_free(struct rc_dev *dev) { }
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static inline void lirc_bpf_run(struct rc_dev *dev, u32 sample) { }
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#endif
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#endif /* _RC_CORE_PRIV */
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@ -14,7 +14,7 @@
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static LIST_HEAD(ir_raw_client_list);
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/* Used to handle IR raw handler extensions */
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static DEFINE_MUTEX(ir_raw_handler_lock);
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DEFINE_MUTEX(ir_raw_handler_lock);
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static LIST_HEAD(ir_raw_handler_list);
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static atomic64_t available_protocols = ATOMIC64_INIT(0);
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@ -621,9 +621,17 @@ void ir_raw_event_unregister(struct rc_dev *dev)
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list_for_each_entry(handler, &ir_raw_handler_list, list)
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if (handler->raw_unregister)
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handler->raw_unregister(dev);
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mutex_unlock(&ir_raw_handler_lock);
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|
||||
lirc_bpf_free(dev);
|
||||
|
||||
ir_raw_event_free(dev);
|
||||
|
||||
/*
|
||||
* A user can be calling bpf(BPF_PROG_{QUERY|ATTACH|DETACH}), so
|
||||
* ensure that the raw member is null on unlock; this is how
|
||||
* "device gone" is checked.
|
||||
*/
|
||||
mutex_unlock(&ir_raw_handler_lock);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
|
|||
|
|
@ -0,0 +1,29 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
#ifndef _BPF_LIRC_H
|
||||
#define _BPF_LIRC_H
|
||||
|
||||
#include <uapi/linux/bpf.h>
|
||||
|
||||
#ifdef CONFIG_BPF_LIRC_MODE2
|
||||
int lirc_prog_attach(const union bpf_attr *attr);
|
||||
int lirc_prog_detach(const union bpf_attr *attr);
|
||||
int lirc_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr);
|
||||
#else
|
||||
static inline int lirc_prog_attach(const union bpf_attr *attr)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static inline int lirc_prog_detach(const union bpf_attr *attr)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static inline int lirc_prog_query(const union bpf_attr *attr,
|
||||
union bpf_attr __user *uattr)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* _BPF_LIRC_H */
|
||||
|
|
@ -26,6 +26,9 @@ BPF_PROG_TYPE(BPF_PROG_TYPE_RAW_TRACEPOINT, raw_tracepoint)
|
|||
#ifdef CONFIG_CGROUP_BPF
|
||||
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_DEVICE, cg_dev)
|
||||
#endif
|
||||
#ifdef CONFIG_BPF_LIRC_MODE2
|
||||
BPF_PROG_TYPE(BPF_PROG_TYPE_LIRC_MODE2, lirc_mode2)
|
||||
#endif
|
||||
|
||||
BPF_MAP_TYPE(BPF_MAP_TYPE_ARRAY, array_map_ops)
|
||||
BPF_MAP_TYPE(BPF_MAP_TYPE_PERCPU_ARRAY, percpu_array_map_ops)
|
||||
|
|
|
|||
|
|
@ -143,6 +143,7 @@ enum bpf_prog_type {
|
|||
BPF_PROG_TYPE_RAW_TRACEPOINT,
|
||||
BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
|
||||
BPF_PROG_TYPE_LWT_SEG6LOCAL,
|
||||
BPF_PROG_TYPE_LIRC_MODE2,
|
||||
};
|
||||
|
||||
enum bpf_attach_type {
|
||||
|
|
@ -162,6 +163,7 @@ enum bpf_attach_type {
|
|||
BPF_CGROUP_INET6_POST_BIND,
|
||||
BPF_CGROUP_UDP4_SENDMSG,
|
||||
BPF_CGROUP_UDP6_SENDMSG,
|
||||
BPF_LIRC_MODE2,
|
||||
__MAX_BPF_ATTACH_TYPE
|
||||
};
|
||||
|
||||
|
|
@ -2005,6 +2007,53 @@ union bpf_attr {
|
|||
* direct packet access.
|
||||
* Return
|
||||
* 0 on success, or a negative error in case of failure.
|
||||
*
|
||||
* int bpf_rc_keydown(void *ctx, u32 protocol, u64 scancode, u32 toggle)
|
||||
* Description
|
||||
* This helper is used in programs implementing IR decoding, to
|
||||
* report a successfully decoded key press with *scancode*,
|
||||
* *toggle* value in the given *protocol*. The scancode will be
|
||||
* translated to a keycode using the rc keymap, and reported as
|
||||
* an input key down event. After a period a key up event is
|
||||
* generated. This period can be extended by calling either
|
||||
* **bpf_rc_keydown** () again with the same values, or calling
|
||||
* **bpf_rc_repeat** ().
|
||||
*
|
||||
* Some protocols include a toggle bit, in case the button was
|
||||
* released and pressed again between consecutive scancodes.
|
||||
*
|
||||
* The *ctx* should point to the lirc sample as passed into
|
||||
* the program.
|
||||
*
|
||||
* The *protocol* is the decoded protocol number (see
|
||||
* **enum rc_proto** for some predefined values).
|
||||
*
|
||||
* This helper is only available is the kernel was compiled with
|
||||
* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
|
||||
* "**y**".
|
||||
*
|
||||
* Return
|
||||
* 0
|
||||
*
|
||||
* int bpf_rc_repeat(void *ctx)
|
||||
* Description
|
||||
* This helper is used in programs implementing IR decoding, to
|
||||
* report a successfully decoded repeat key message. This delays
|
||||
* the generation of a key up event for previously generated
|
||||
* key down event.
|
||||
*
|
||||
* Some IR protocols like NEC have a special IR message for
|
||||
* repeating last button, for when a button is held down.
|
||||
*
|
||||
* The *ctx* should point to the lirc sample as passed into
|
||||
* the program.
|
||||
*
|
||||
* This helper is only available is the kernel was compiled with
|
||||
* the **CONFIG_BPF_LIRC_MODE2** configuration option set to
|
||||
* "**y**".
|
||||
*
|
||||
* Return
|
||||
* 0
|
||||
*/
|
||||
#define __BPF_FUNC_MAPPER(FN) \
|
||||
FN(unspec), \
|
||||
|
|
@ -2083,7 +2132,9 @@ union bpf_attr {
|
|||
FN(lwt_push_encap), \
|
||||
FN(lwt_seg6_store_bytes), \
|
||||
FN(lwt_seg6_adjust_srh), \
|
||||
FN(lwt_seg6_action),
|
||||
FN(lwt_seg6_action), \
|
||||
FN(rc_repeat), \
|
||||
FN(rc_keydown),
|
||||
|
||||
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
|
||||
* function eBPF program intends to call
|
||||
|
|
|
|||
|
|
@ -11,6 +11,7 @@
|
|||
*/
|
||||
#include <linux/bpf.h>
|
||||
#include <linux/bpf_trace.h>
|
||||
#include <linux/bpf_lirc.h>
|
||||
#include <linux/btf.h>
|
||||
#include <linux/syscalls.h>
|
||||
#include <linux/slab.h>
|
||||
|
|
@ -1582,6 +1583,8 @@ static int bpf_prog_attach(const union bpf_attr *attr)
|
|||
case BPF_SK_SKB_STREAM_PARSER:
|
||||
case BPF_SK_SKB_STREAM_VERDICT:
|
||||
return sockmap_get_from_fd(attr, BPF_PROG_TYPE_SK_SKB, true);
|
||||
case BPF_LIRC_MODE2:
|
||||
return lirc_prog_attach(attr);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
|
@ -1654,6 +1657,8 @@ static int bpf_prog_detach(const union bpf_attr *attr)
|
|||
case BPF_SK_SKB_STREAM_PARSER:
|
||||
case BPF_SK_SKB_STREAM_VERDICT:
|
||||
return sockmap_get_from_fd(attr, BPF_PROG_TYPE_SK_SKB, false);
|
||||
case BPF_LIRC_MODE2:
|
||||
return lirc_prog_detach(attr);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
|
@ -1703,6 +1708,8 @@ static int bpf_prog_query(const union bpf_attr *attr,
|
|||
case BPF_CGROUP_SOCK_OPS:
|
||||
case BPF_CGROUP_DEVICE:
|
||||
break;
|
||||
case BPF_LIRC_MODE2:
|
||||
return lirc_prog_query(attr, uattr);
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue