linux-kernel - [PATCH bpf-next v2 20/28] HID: add implementation of bpf_hid_raw

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Date:   Fri,  4 Mar 2022 18:28:44 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Jiri Kosina <jikos@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Joe Stringer <joe@...ium.io>
Cc:     Tero Kristo <tero.kristo@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH bpf-next v2 20/28] HID: add implementation of bpf_hid_raw_request

Hook up BPF to hid_hw_raw_request.
Not much to report here except that we need to export hid_get_report
from hid-core so it gets available in hid-bpf.c

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

---

changes in v2:
- split the series by bpf/libbpf/hid/selftests and samples
---
 drivers/hid/hid-bpf.c  | 63 ++++++++++++++++++++++++++++++++++++++++++
 drivers/hid/hid-core.c |  3 +-
 include/linux/hid.h    |  1 +
 3 files changed, 65 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-bpf.c b/drivers/hid/hid-bpf.c
index 8ae247fba5bc..b8c0060f3180 100644
--- a/drivers/hid/hid-bpf.c
+++ b/drivers/hid/hid-bpf.c
@@ -171,6 +171,68 @@ int hid_bpf_set_data(struct hid_device *hdev, u8 *buf, size_t buf_size, u64 offs
 	return n;
 }
 
+int hid_bpf_raw_request(struct hid_device *hdev, u8 *buf, size_t size,
+			u8 rtype, u8 reqtype)
+{
+	struct hid_report *report;
+	struct hid_report_enum *report_enum;
+	u8 *dma_data;
+	u32 report_len;
+	int ret;
+
+	/* check arguments */
+	switch (rtype) {
+	case HID_INPUT_REPORT:
+	case HID_OUTPUT_REPORT:
+	case HID_FEATURE_REPORT:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (reqtype) {
+	case HID_REQ_GET_REPORT:
+	case HID_REQ_GET_IDLE:
+	case HID_REQ_GET_PROTOCOL:
+	case HID_REQ_SET_REPORT:
+	case HID_REQ_SET_IDLE:
+	case HID_REQ_SET_PROTOCOL:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (size < 1)
+		return -EINVAL;
+
+	report_enum = hdev->report_enum + rtype;
+	report = hid_get_report(report_enum, buf);
+	if (!report)
+		return -EINVAL;
+
+	report_len = hid_report_len(report);
+
+	if (size > report_len)
+		size = report_len;
+
+	dma_data = kmemdup(buf, size, GFP_KERNEL);
+	if (!dma_data)
+		return -ENOMEM;
+
+	ret = hid_hw_raw_request(hdev,
+				 dma_data[0],
+				 dma_data,
+				 size,
+				 rtype,
+				 reqtype);
+
+	if (ret > 0)
+		memcpy(buf, dma_data, ret);
+
+	kfree(dma_data);
+	return ret;
+}
+
 static int hid_bpf_run_progs(struct hid_device *hdev, enum bpf_hid_attach_type type,
 			     struct hid_bpf_ctx *ctx, u8 *data, int size)
 {
@@ -272,6 +334,7 @@ int __init hid_bpf_module_init(void)
 		.array_detached = hid_bpf_array_detached,
 		.hid_get_data = hid_bpf_get_data,
 		.hid_set_data = hid_bpf_set_data,
+		.hid_raw_request  = hid_bpf_raw_request,
 	};
 
 	bpf_hid_set_hooks(&hooks);
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index d3f4499ee4cd..d0e015986e17 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -1686,8 +1686,7 @@ int hid_set_field(struct hid_field *field, unsigned offset, __s32 value)
 }
 EXPORT_SYMBOL_GPL(hid_set_field);
 
-static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
-		const u8 *data)
+struct hid_report *hid_get_report(struct hid_report_enum *report_enum, const u8 *data)
 {
 	struct hid_report *report;
 	unsigned int n = 0;	/* Normally report number is 0 */
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 7454e844324c..b2698df31e5b 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -946,6 +946,7 @@ __u32 hid_field_extract(const struct hid_device *hid, __u8 *report,
 		     unsigned offset, unsigned n);
 void implement(const struct hid_device *hid, u8 *report, unsigned int offset, unsigned int n,
 	       u32 value);
+struct hid_report *hid_get_report(struct hid_report_enum *report_enum, const u8 *data);
 
 #ifdef CONFIG_PM
 int hid_driver_suspend(struct hid_device *hdev, pm_message_t state);
-- 
2.35.1