linux-kernel - [RFC 1/3] uapi: vhost: add vhost-net netfilter offload API

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Message-ID: <20260208143441.2177372-2-lulu@redhat.com>
Date: Sun,  8 Feb 2026 22:32:22 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com,
	mst@...hat.com,
	jasowang@...hat.com,
	kvm@...r.kernel.org,
	virtualization@...ts.linux.dev,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [RFC 1/3] uapi: vhost: add vhost-net netfilter offload API

Add VHOST_NET_SET_FILTER ioctl and the filter socket protocol used for
vhost-net filter offload.

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 include/uapi/linux/vhost.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index c57674a6aa0d..d9a0ca7a3df0 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -131,6 +131,26 @@
  * device.  This can be used to stop the ring (e.g. for migration). */
 #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
 
+/* VHOST_NET filter offload (kernel vhost-net dataplane through QEMU netfilter) */
+struct vhost_net_filter {
+	__s32 fd;
+};
+
+enum {
+	VHOST_NET_FILTER_MSG_REQUEST = 1,
+};
+
+#define VHOST_NET_FILTER_DIRECTION_TX 1
+
+struct vhost_net_filter_msg {
+	__u16 type;
+	__u16 direction;
+	__u32 len;
+};
+
+
+#define VHOST_NET_SET_FILTER _IOW(VHOST_VIRTIO, 0x31, struct vhost_net_filter)
+
 /* VHOST_SCSI specific defines */
 
 #define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
-- 
2.52.0