linux-kernel - [PATCH net-next V2 2/3] tun: introduce ioctls to set and get steering policies

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Date:   Tue, 31 Oct 2017 18:32:17 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     mst@...hat.com, willemdebruijn.kernel@...il.com,
        tom@...bertland.com, Jason Wang <jasowang@...hat.com>
Subject: [PATCH net-next V2 2/3] tun: introduce ioctls to set and get steering policies

This patch introduces new ioctl for change packet steering policy for
tun. Only automatic flow steering is supported, more policies will
come.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/net/tun.c           | 35 ++++++++++++++++++++++++++++++++++-
 include/uapi/linux/if_tun.h |  7 +++++++
 2 files changed, 41 insertions(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index bff6259..ab109ff 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -122,7 +122,8 @@ do {								\
 #define TUN_VNET_BE     0x40000000
 
 #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \
-		      IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS)
+		      IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS | \
+		      IFF_MULTI_STEERING)
 
 #define GOODCOPY_LEN 128
 
@@ -2516,6 +2517,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 	unsigned int ifindex;
 	int le;
 	int ret;
+	unsigned int steering;
 
 	if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == SOCK_IOC_TYPE) {
 		if (copy_from_user(&ifr, argp, ifreq_len))
@@ -2774,6 +2776,37 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 		ret = 0;
 		break;
 
+	case TUNSETSTEERING:
+		ret = -EFAULT;
+		if (copy_from_user(&steering, argp, sizeof(steering)))
+			break;
+		ret = 0;
+		switch (steering) {
+		case TUN_STEERING_AUTOMQ:
+			tun->steering_ops = &tun_automq_ops;
+			break;
+		default:
+			ret = -EFAULT;
+		}
+		break;
+
+	case TUNGETSTEERING:
+		ret = 0;
+		if (tun->steering_ops == &tun_automq_ops)
+			steering = TUN_STEERING_AUTOMQ;
+		else
+			BUG();
+		if (copy_to_user(argp, &steering, sizeof(steering)))
+			ret = -EFAULT;
+		break;
+
+	case TUNGETSTEERINGFEATURES:
+		ret = 0;
+		steering = TUN_STEERING_AUTOMQ;
+		if (copy_to_user(argp, &steering, sizeof(steering)))
+			ret = -EFAULT;
+		break;
+
 	default:
 		ret = -EINVAL;
 		break;
diff --git a/include/uapi/linux/if_tun.h b/include/uapi/linux/if_tun.h
index 365ade5..109760e 100644
--- a/include/uapi/linux/if_tun.h
+++ b/include/uapi/linux/if_tun.h
@@ -56,6 +56,9 @@
  */
 #define TUNSETVNETBE _IOW('T', 222, int)
 #define TUNGETVNETBE _IOR('T', 223, int)
+#define TUNSETSTEERING _IOW('T', 224, unsigned int)
+#define TUNGETSTEERING _IOR('T', 225, unsigned int)
+#define TUNGETSTEERINGFEATURES _IOR('T', 226, unsigned int)
 
 /* TUNSETIFF ifr flags */
 #define IFF_TUN		0x0001
@@ -70,6 +73,8 @@
 #define IFF_MULTI_QUEUE 0x0100
 #define IFF_ATTACH_QUEUE 0x0200
 #define IFF_DETACH_QUEUE 0x0400
+#define IFF_MULTI_STEERING 0x2000
+
 /* read-only flag */
 #define IFF_PERSIST	0x0800
 #define IFF_NOFILTER	0x1000
@@ -106,4 +111,6 @@ struct tun_filter {
 	__u8   addr[0][ETH_ALEN];
 };
 
+#define TUN_STEERING_AUTOMQ 0x01 /* Automatic flow steering */
+
 #endif /* _UAPI__IF_TUN_H */
-- 
2.7.4