Message-Id: <82363bf25c059528b93fbe542d88f147b5081424.1526409690.git.sean@mess.org>
Date:   Tue, 15 May 2018 19:50:19 +0100
From:   Sean Young <sean@...s.org>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexei Starovoitov <ast@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        Matthias Reichl <hias@...us.com>,
        Devin Heitmueller <dheitmueller@...nellabs.com>,
        Y Song <ys114321@...il.com>
Subject: [PATCH v2 1/2] media: rc: introduce BPF_PROG_RAWIR_EVENT

Add support for BPF_PROG_RAWIR_EVENT. 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.

Signed-off-by: Sean Young <sean@...s.org>
---
 drivers/media/rc/Kconfig           |  10 +
 drivers/media/rc/Makefile          |   1 +
 drivers/media/rc/bpf-rawir-event.c | 322 +++++++++++++++++++++++++++++
 drivers/media/rc/lirc_dev.c        |  28 +++
 drivers/media/rc/rc-core-priv.h    |  19 ++
 drivers/media/rc/rc-ir-raw.c       |   3 +
 include/linux/bpf_rcdev.h          |  30 +++
 include/linux/bpf_types.h          |   3 +
 include/uapi/linux/bpf.h           |  55 ++++-
 kernel/bpf/syscall.c               |   7 +
 10 files changed, 477 insertions(+), 1 deletion(-)
 create mode 100644 drivers/media/rc/bpf-rawir-event.c
 create mode 100644 include/linux/bpf_rcdev.h

diff --git a/drivers/media/rc/Kconfig b/drivers/media/rc/Kconfig
index eb2c3b6eca7f..55747af5b978 100644
--- a/drivers/media/rc/Kconfig
+++ b/drivers/media/rc/Kconfig
@@ -25,6 +25,16 @@ config LIRC
 	   passes raw IR to and from userspace, which is needed for
 	   IR transmitting (aka "blasting") and for the lirc daemon.
 
+config BPF_RAWIR_EVENT
+	bool "Enable attaching BPF programs to lirc devices"
+	depends on BPF_SYSCALL
+	depends on RC_CORE=y
+	depends on LIRC
+	help
+	   Enable this option to make it possible to load custom IR
+	   decoders written in BPF. These decoders are type
+	   BPF_PROG_TYPE_RAW_IR_EVENT.
+
 menuconfig RC_DECODERS
 	bool "Remote controller decoders"
 	depends on RC_CORE
diff --git a/drivers/media/rc/Makefile b/drivers/media/rc/Makefile
index 2e1c87066f6c..74907823bef8 100644
--- a/drivers/media/rc/Makefile
+++ b/drivers/media/rc/Makefile
@@ -5,6 +5,7 @@ obj-y += keymaps/
 obj-$(CONFIG_RC_CORE) += rc-core.o
 rc-core-y := rc-main.o rc-ir-raw.o
 rc-core-$(CONFIG_LIRC) += lirc_dev.o
+rc-core-$(CONFIG_BPF_RAWIR_EVENT) += bpf-rawir-event.o
 obj-$(CONFIG_IR_NEC_DECODER) += ir-nec-decoder.o
 obj-$(CONFIG_IR_RC5_DECODER) += ir-rc5-decoder.o
 obj-$(CONFIG_IR_RC6_DECODER) += ir-rc6-decoder.o
diff --git a/drivers/media/rc/bpf-rawir-event.c b/drivers/media/rc/bpf-rawir-event.c
new file mode 100644
index 000000000000..8007841977d6
--- /dev/null
+++ b/drivers/media/rc/bpf-rawir-event.c
@@ -0,0 +1,322 @@
+// SPDX-License-Identifier: GPL-2.0
+// bpf-rawir-event.c - handles bpf
+//
+// Copyright (C) 2018 Sean Young <sean@...s.org>
+
+#include <linux/bpf.h>
+#include <linux/filter.h>
+#include "rc-core-priv.h"
+
+/*
+ * BPF interface for raw IR
+ */
+const struct bpf_prog_ops rawir_event_prog_ops = {
+};
+
+BPF_CALL_1(bpf_rc_repeat, struct bpf_rawir_event*, event)
+{
+	struct ir_raw_event_ctrl *ctrl;
+
+	ctrl = container_of(event, struct ir_raw_event_ctrl, bpf_rawir_event);
+
+	rc_repeat(ctrl->dev);
+
+	return 0;
+}
+
+static const struct bpf_func_proto rc_repeat_proto = {
+	.func	   = bpf_rc_repeat,
+	.gpl_only  = true, /* rc_repeat is EXPORT_SYMBOL_GPL */
+	.ret_type  = RET_INTEGER,
+	.arg1_type = ARG_PTR_TO_CTX,
+};
+
+BPF_CALL_4(bpf_rc_keydown, struct bpf_rawir_event*, event, u32, protocol,
+	   u32, scancode, u32, toggle)
+{
+	struct ir_raw_event_ctrl *ctrl;
+
+	ctrl = container_of(event, struct ir_raw_event_ctrl, bpf_rawir_event);
+
+	rc_keydown(ctrl->dev, protocol, scancode, toggle != 0);
+
+	return 0;
+}
+
+static const struct bpf_func_proto rc_keydown_proto = {
+	.func	   = bpf_rc_keydown,
+	.gpl_only  = true, /* rc_keydown is EXPORT_SYMBOL_GPL */
+	.ret_type  = RET_INTEGER,
+	.arg1_type = ARG_PTR_TO_CTX,
+	.arg2_type = ARG_ANYTHING,
+	.arg3_type = ARG_ANYTHING,
+	.arg4_type = ARG_ANYTHING,
+};
+
+static const struct bpf_func_proto *
+rawir_event_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
+{
+	switch (func_id) {
+	case BPF_FUNC_rc_repeat:
+		return &rc_repeat_proto;
+	case BPF_FUNC_rc_keydown:
+		return &rc_keydown_proto;
+	case BPF_FUNC_map_lookup_elem:
+		return &bpf_map_lookup_elem_proto;
+	case BPF_FUNC_map_update_elem:
+		return &bpf_map_update_elem_proto;
+	case BPF_FUNC_map_delete_elem:
+		return &bpf_map_delete_elem_proto;
+	case BPF_FUNC_ktime_get_ns:
+		return &bpf_ktime_get_ns_proto;
+	case BPF_FUNC_tail_call:
+		return &bpf_tail_call_proto;
+	case BPF_FUNC_get_prandom_u32:
+		return &bpf_get_prandom_u32_proto;
+	default:
+		return NULL;
+	}
+}
+
+static bool rawir_event_is_valid_access(int off, int size,
+					enum bpf_access_type type,
+					const struct bpf_prog *prog,
+					struct bpf_insn_access_aux *info)
+{
+	/* struct bpf_rawir_event has two u32 fields */
+	if (type == BPF_WRITE)
+		return false;
+
+	if (size != sizeof(__u32))
+		return false;
+
+	if (!(off == offsetof(struct bpf_rawir_event, duration) ||
+	      off == offsetof(struct bpf_rawir_event, type)))
+		return false;
+
+	return true;
+}
+
+const struct bpf_verifier_ops rawir_event_verifier_ops = {
+	.get_func_proto  = rawir_event_func_proto,
+	.is_valid_access = rawir_event_is_valid_access
+};
+
+#define BPF_MAX_PROGS 64
+
+static int rc_dev_bpf_attach(struct rc_dev *rcdev, struct bpf_prog *prog)
+{
+	struct ir_raw_event_ctrl *raw;
+	struct bpf_prog_array __rcu *old_array;
+	struct bpf_prog_array *new_array;
+	int ret, i, size;
+
+	if (rcdev->driver_type != RC_DRIVER_IR_RAW)
+		return -EINVAL;
+
+	ret = mutex_lock_interruptible(&rcdev->lock);
+	if (ret)
+		return ret;
+
+	raw = rcdev->raw;
+
+	if (raw->progs) {
+		size = bpf_prog_array_length(raw->progs);
+		for (i = 0; i < size; i++) {
+			if (prog == raw->progs->progs[i]) {
+				ret = -EEXIST;
+				goto out;
+			}
+		}
+
+		if (size >= BPF_MAX_PROGS) {
+			ret = -E2BIG;
+			goto out;
+		}
+	}
+
+	old_array = raw->progs;
+	ret = bpf_prog_array_copy(old_array, NULL, prog, &new_array);
+	if (ret < 0)
+		goto out;
+
+	rcu_assign_pointer(raw->progs, new_array);
+	bpf_prog_array_free(old_array);
+out:
+	mutex_unlock(&rcdev->lock);
+	return ret;
+}
+
+static int rc_dev_bpf_detach(struct rc_dev *rcdev, struct bpf_prog *prog)
+{
+	struct ir_raw_event_ctrl *raw;
+	struct bpf_prog_array __rcu *old_array;
+	struct bpf_prog_array *new_array;
+	int ret;
+
+	if (rcdev->driver_type != RC_DRIVER_IR_RAW)
+		return -EINVAL;
+
+	ret = mutex_lock_interruptible(&rcdev->lock);
+	if (ret)
+		return ret;
+
+	raw = rcdev->raw;
+
+	old_array = raw->progs;
+	ret = bpf_prog_array_copy(old_array, prog, NULL, &new_array);
+	if (ret < 0) {
+		bpf_prog_array_delete_safe(old_array, prog);
+	} else {
+		rcu_assign_pointer(raw->progs, new_array);
+		bpf_prog_array_free(old_array);
+	}
+
+	bpf_prog_put(prog);
+	mutex_unlock(&rcdev->lock);
+	return 0;
+}
+
+void rc_dev_bpf_run(struct rc_dev *rcdev, struct ir_raw_event ev)
+{
+	struct ir_raw_event_ctrl *raw = rcdev->raw;
+
+	if (!raw->progs)
+		return;
+
+	if (unlikely(ev.carrier_report)) {
+		raw->bpf_rawir_event.carrier = ev.carrier;
+		raw->bpf_rawir_event.type = BPF_RAWIR_EVENT_CARRIER;
+	} else {
+		raw->bpf_rawir_event.duration = ev.duration;
+
+		if (ev.pulse)
+			raw->bpf_rawir_event.type = BPF_RAWIR_EVENT_PULSE;
+		else if (ev.timeout)
+			raw->bpf_rawir_event.type = BPF_RAWIR_EVENT_TIMEOUT;
+		else if (ev.reset)
+			raw->bpf_rawir_event.type = BPF_RAWIR_EVENT_RESET;
+		else
+			raw->bpf_rawir_event.type = BPF_RAWIR_EVENT_SPACE;
+	}
+
+	BPF_PROG_RUN_ARRAY(raw->progs, &raw->bpf_rawir_event, BPF_PROG_RUN);
+}
+
+void rc_dev_bpf_put(struct rc_dev *rcdev)
+{
+	struct bpf_prog_array *progs = rcdev->raw->progs;
+	int i, size;
+
+	if (!progs)
+		return;
+
+	size = bpf_prog_array_length(progs);
+	for (i = 0; i < size; i++)
+		bpf_prog_put(progs->progs[i]);
+
+	bpf_prog_array_free(rcdev->raw->progs);
+}
+
+int rc_dev_prog_attach(const union bpf_attr *attr)
+{
+	struct bpf_prog *prog;
+	struct rc_dev *rcdev;
+	int ret;
+
+	if (attr->attach_flags)
+		return -EINVAL;
+
+	prog = bpf_prog_get_type(attr->attach_bpf_fd,
+				 BPF_PROG_TYPE_RAWIR_EVENT);
+	if (IS_ERR(prog))
+		return PTR_ERR(prog);
+
+	rcdev = rc_dev_get_from_fd(attr->target_fd);
+	if (IS_ERR(rcdev)) {
+		bpf_prog_put(prog);
+		return PTR_ERR(rcdev);
+	}
+
+	ret = rc_dev_bpf_attach(rcdev, prog);
+	if (ret)
+		bpf_prog_put(prog);
+
+	put_device(&rcdev->dev);
+
+	return ret;
+}
+
+int rc_dev_prog_detach(const union bpf_attr *attr)
+{
+	struct bpf_prog *prog;
+	struct rc_dev *rcdev;
+	int ret;
+
+	if (attr->attach_flags)
+		return -EINVAL;
+
+	prog = bpf_prog_get_type(attr->attach_bpf_fd,
+				 BPF_PROG_TYPE_RAWIR_EVENT);
+	if (IS_ERR(prog))
+		return PTR_ERR(prog);
+
+	rcdev = rc_dev_get_from_fd(attr->target_fd);
+	if (IS_ERR(rcdev)) {
+		bpf_prog_put(prog);
+		return PTR_ERR(rcdev);
+	}
+
+	ret = rc_dev_bpf_detach(rcdev, prog);
+
+	bpf_prog_put(prog);
+	put_device(&rcdev->dev);
+
+	return ret;
+}
+
+int rc_dev_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr)
+{
+	__u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
+	struct bpf_prog_array *progs;
+	struct rc_dev *rcdev;
+	u32 cnt, flags = 0;
+	int ret;
+
+	if (attr->query.query_flags)
+		return -EINVAL;
+
+	rcdev = rc_dev_get_from_fd(attr->query.target_fd);
+	if (IS_ERR(rcdev))
+		return PTR_ERR(rcdev);
+
+	if (rcdev->driver_type != RC_DRIVER_IR_RAW) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	ret = mutex_lock_interruptible(&rcdev->lock);
+	if (ret)
+		goto out;
+
+	progs = rcdev->raw->progs;
+	cnt = progs ? bpf_prog_array_length(progs) : 0;
+
+	if (copy_to_user(&uattr->query.prog_cnt, &cnt, sizeof(cnt))) {
+		ret = -EFAULT;
+		goto out;
+	}
+	if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags))) {
+		ret = -EFAULT;
+		goto out;
+	}
+
+	if (attr->query.prog_cnt != 0 && prog_ids && cnt)
+		ret = bpf_prog_array_copy_to_user(progs, prog_ids, cnt);
+
+out:
+	mutex_unlock(&rcdev->lock);
+	put_device(&rcdev->dev);
+
+	return ret;
+}
diff --git a/drivers/media/rc/lirc_dev.c b/drivers/media/rc/lirc_dev.c
index 24e9fbb80e81..c3028d0366d1 100644
--- a/drivers/media/rc/lirc_dev.c
+++ b/drivers/media/rc/lirc_dev.c
@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/device.h>
+#include <linux/file.h>
 #include <linux/idr.h>
 #include <linux/poll.h>
 #include <linux/sched.h>
@@ -816,4 +817,31 @@ void __exit lirc_dev_exit(void)
 	unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
 }
 
+struct rc_dev *rc_dev_get_from_fd(int fd)
+{
+	struct rc_dev *dev;
+	struct file *f;
+
+	f = fget_raw(fd);
+	if (!f)
+		return ERR_PTR(-EBADF);
+
+	if (!S_ISCHR(f->f_inode->i_mode) ||
+	    imajor(f->f_inode) != MAJOR(lirc_base_dev)) {
+		fput(f);
+		return ERR_PTR(-EBADF);
+	}
+
+	dev = container_of(f->f_inode->i_cdev, struct rc_dev, lirc_cdev);
+	if (!dev->registered) {
+		fput(f);
+		return ERR_PTR(-ENODEV);
+	}
+
+	get_device(&dev->dev);
+	fput(f);
+
+	return dev;
+}
+
 MODULE_ALIAS("lirc_dev");
diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
index e0e6a17460f6..6db579f425f1 100644
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -13,6 +13,7 @@
 #define	MAX_IR_EVENT_SIZE	512
 
 #include <linux/slab.h>
+#include <uapi/linux/bpf.h>
 #include <media/rc-core.h>
 
 /**
@@ -57,6 +58,11 @@ struct ir_raw_event_ctrl {
 	/* raw decoder state follows */
 	struct ir_raw_event prev_ev;
 	struct ir_raw_event this_ev;
+
+#ifdef CONFIG_BPF_RAWIR_EVENT
+	struct bpf_rawir_event		bpf_rawir_event;
+	struct bpf_prog_array		*progs;
+#endif
 	struct nec_dec {
 		int state;
 		unsigned count;
@@ -288,6 +294,7 @@ void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev);
 void ir_lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc);
 int ir_lirc_register(struct rc_dev *dev);
 void ir_lirc_unregister(struct rc_dev *dev);
+struct rc_dev *rc_dev_get_from_fd(int fd);
 #else
 static inline int lirc_dev_init(void) { return 0; }
 static inline void lirc_dev_exit(void) {}
@@ -299,4 +306,16 @@ static inline int ir_lirc_register(struct rc_dev *dev) { return 0; }
 static inline void ir_lirc_unregister(struct rc_dev *dev) { }
 #endif
 
+/*
+ * bpf interface
+ */
+#ifdef CONFIG_BPF_RAWIR_EVENT
+void rc_dev_bpf_put(struct rc_dev *dev);
+void rc_dev_bpf_run(struct rc_dev *dev, struct ir_raw_event ev);
+#else
+static inline void rc_dev_bpf_put(struct rc_dev *dev) { }
+static inline void rc_dev_bpf_run(struct rc_dev *dev, struct ir_raw_event ev)
+{ }
+#endif
+
 #endif /* _RC_CORE_PRIV */
diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
index 374f83105a23..25828f15faec 100644
--- a/drivers/media/rc/rc-ir-raw.c
+++ b/drivers/media/rc/rc-ir-raw.c
@@ -32,6 +32,7 @@ static int ir_raw_event_thread(void *data)
 				    handler->protocols || !handler->protocols)
 					handler->decode(raw->dev, ev);
 			ir_lirc_raw_event(raw->dev, ev);
+			rc_dev_bpf_run(raw->dev, ev);
 			raw->prev_ev = ev;
 		}
 		mutex_unlock(&ir_raw_handler_lock);
@@ -623,6 +624,8 @@ void ir_raw_event_unregister(struct rc_dev *dev)
 			handler->raw_unregister(dev);
 	mutex_unlock(&ir_raw_handler_lock);
 
+	rc_dev_bpf_put(dev);
+
 	ir_raw_event_free(dev);
 }
 
diff --git a/include/linux/bpf_rcdev.h b/include/linux/bpf_rcdev.h
new file mode 100644
index 000000000000..17a30f30436a
--- /dev/null
+++ b/include/linux/bpf_rcdev.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BPF_RCDEV_H
+#define _BPF_RCDEV_H
+
+#include <linux/bpf.h>
+#include <uapi/linux/bpf.h>
+
+#ifdef CONFIG_BPF_RAWIR_EVENT
+int rc_dev_prog_attach(const union bpf_attr *attr);
+int rc_dev_prog_detach(const union bpf_attr *attr);
+int rc_dev_prog_query(const union bpf_attr *attr, union bpf_attr __user *uattr);
+#else
+static inline int rc_dev_prog_attach(const union bpf_attr *attr)
+{
+	return -EINVAL;
+}
+
+static inline int rc_dev_prog_detach(const union bpf_attr *attr)
+{
+	return -EINVAL;
+}
+
+static inline int rc_dev_prog_query(const union bpf_attr *attr,
+				    union bpf_attr __user *uattr)
+{
+	return -EINVAL;
+}
+#endif
+
+#endif /* _BPF_RCDEV_H */
diff --git a/include/linux/bpf_types.h b/include/linux/bpf_types.h
index d7df1b323082..667d1d557090 100644
--- a/include/linux/bpf_types.h
+++ b/include/linux/bpf_types.h
@@ -25,6 +25,9 @@ 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_RAWIR_EVENT
+BPF_PROG_TYPE(BPF_PROG_TYPE_RAWIR_EVENT, rawir_event)
+#endif
 
 BPF_MAP_TYPE(BPF_MAP_TYPE_ARRAY, array_map_ops)
 BPF_MAP_TYPE(BPF_MAP_TYPE_PERCPU_ARRAY, percpu_array_map_ops)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 02e4112510f8..8ba1be825af0 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -140,6 +140,7 @@ enum bpf_prog_type {
 	BPF_PROG_TYPE_SK_MSG,
 	BPF_PROG_TYPE_RAW_TRACEPOINT,
 	BPF_PROG_TYPE_CGROUP_SOCK_ADDR,
+	BPF_PROG_TYPE_RAWIR_EVENT,
 };
 
 enum bpf_attach_type {
@@ -157,6 +158,7 @@ enum bpf_attach_type {
 	BPF_CGROUP_INET6_CONNECT,
 	BPF_CGROUP_INET4_POST_BIND,
 	BPF_CGROUP_INET6_POST_BIND,
+	BPF_RAWIR_EVENT,
 	__MAX_BPF_ATTACH_TYPE
 };
 
@@ -1855,6 +1857,35 @@ union bpf_attr {
  *             Egress device index on success, 0 if packet needs to continue
  *             up the stack for further processing or a negative error in case
  *             of failure.
+ *
+ * int bpf_rc_keydown(void *ctx, u32 protocol, u32 scancode, u32 toggle)
+ *	Description
+ *		Report decoded scancode with toggle value. For use in
+ *		BPF_PROG_TYPE_RAWIR_EVENT, to report a successfully
+ *		decoded scancode. This is will generate a keydown event,
+ *		and a keyup event once the scancode is no longer repeated.
+ *
+ *		*ctx* pointer to bpf_rawir_event, *protocol* is decoded
+ *		protocol (see RC_PROTO_* enum).
+ *
+ *		Some protocols include a toggle bit, in case the button
+ *		was released and pressed again between consecutive scancodes,
+ *		copy this bit into *toggle* if it exists, else set to 0.
+ *
+ *     Return
+ *		Always return 0 (for now)
+ *
+ * int bpf_rc_repeat(void *ctx)
+ *	Description
+ *		Repeat the last decoded scancode; some IR protocols like
+ *		NEC have a special IR message for repeat last button,
+ *		in case user is holding a button down; the scancode is
+ *		not repeated.
+ *
+ *		*ctx* pointer to bpf_rawir_event.
+ *
+ *     Return
+ *		Always return 0 (for now)
  */
 #define __BPF_FUNC_MAPPER(FN)		\
 	FN(unspec),			\
@@ -1926,7 +1957,9 @@ union bpf_attr {
 	FN(skb_get_xfrm_state),		\
 	FN(get_stack),			\
 	FN(skb_load_bytes_relative),	\
-	FN(fib_lookup),
+	FN(fib_lookup),			\
+	FN(rc_repeat),			\
+	FN(rc_keydown),
 
 /* integer value in 'imm' field of BPF_CALL instruction selects which helper
  * function eBPF program intends to call
@@ -1993,6 +2026,26 @@ enum bpf_hdr_start_off {
 	BPF_HDR_START_NET,
 };
 
+/*
+ * user accessible mirror of in-kernel ir_raw_event
+ */
+#define BPF_RAWIR_EVENT_SPACE		0
+#define BPF_RAWIR_EVENT_PULSE		1
+#define BPF_RAWIR_EVENT_TIMEOUT		2
+#define BPF_RAWIR_EVENT_RESET		3
+#define BPF_RAWIR_EVENT_CARRIER		4
+#define BPF_RAWIR_EVENT_DUTY_CYCLE	5
+
+struct bpf_rawir_event {
+	union {
+		__u32	duration;
+		__u32	carrier;
+		__u32	duty_cycle;
+	};
+
+	__u32	type;
+};
+
 /* user accessible mirror of in-kernel sk_buff.
  * new fields can only be added to the end of this structure
  */
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index e2aeb5e89f44..75c089f407c8 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -11,6 +11,7 @@
  */
 #include <linux/bpf.h>
 #include <linux/bpf_trace.h>
+#include <linux/bpf_rcdev.h>
 #include <linux/btf.h>
 #include <linux/syscalls.h>
 #include <linux/slab.h>
@@ -1567,6 +1568,8 @@ 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_RAWIR_EVENT:
+		return rc_dev_prog_attach(attr);
 	default:
 		return -EINVAL;
 	}
@@ -1637,6 +1640,8 @@ 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_RAWIR_EVENT:
+		return rc_dev_prog_detach(attr);
 	default:
 		return -EINVAL;
 	}
@@ -1684,6 +1689,8 @@ static int bpf_prog_query(const union bpf_attr *attr,
 	case BPF_CGROUP_SOCK_OPS:
 	case BPF_CGROUP_DEVICE:
 		break;
+	case BPF_RAWIR_EVENT:
+		return rc_dev_prog_query(attr, uattr);
 	default:
 		return -EINVAL;
 	}
-- 
2.17.0

Powered by blists - more mailing lists