linux-kernel - [net-next rfc V2 6/8] macvtap: allow TUNSETIFF to create multiqueue device

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Message-Id: <1369994005-5943-7-git-send-email-jasowang@redhat.com>
Date:	Fri, 31 May 2013 17:53:23 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, mst@...hat.com
Cc:	Jason Wang <jasowang@...hat.com>
Subject: [net-next rfc V2 6/8] macvtap: allow TUNSETIFF to create multiqueue device

Though the queue were in fact created by open(), we still need to add this check
to be compatible with tuntap which can let mgmt software use a single API to
manage queues. This patch only validates the device name and moves the TUNSETIFF
to a helper.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/net/macvtap.c |   51 ++++++++++++++++++++++++++++++++++++++----------
 1 files changed, 40 insertions(+), 11 deletions(-)

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index e76484c..eac49cb 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -870,6 +870,7 @@ out:
 	return ret;
 }
 
+
 static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q)
 {
 	struct macvlan_dev *vlan;
@@ -888,6 +889,44 @@ static void macvtap_put_vlan(struct macvlan_dev *vlan)
 	dev_put(vlan->dev);
 }
 
+static int macvtap_set_iff(struct file *file, struct ifreq __user *ifr_u)
+{
+	struct macvtap_queue *q = file->private_data;
+	struct net *net = current->nsproxy->net_ns;
+	struct inode *inode = file_inode(file);
+	struct net_device *dev, *dev2;
+	struct ifreq ifr;
+
+	if (copy_from_user(&ifr, ifr_u, sizeof(struct ifreq)))
+		return -EFAULT;
+
+	/* To keep the same behavior of tuntap, validate ifr_name */
+	if (ifr.ifr_flags & IFF_MULTI_QUEUE) {
+		dev = __dev_get_by_name(net, ifr.ifr_name);
+		if (!dev)
+			return -EINVAL;
+
+		dev2 = dev_get_by_macvtap_minor(iminor(inode));
+		if (!dev2)
+			return -EINVAL;
+
+		if (dev != dev2) {
+			dev_put(dev2);
+			return -EINVAL;
+		}
+
+		dev_put(dev2);
+	}
+
+	if ((ifr.ifr_flags & ~(IFF_VNET_HDR | IFF_MULTI_QUEUE)) !=
+	    (IFF_NO_PI | IFF_TAP))
+		return -EINVAL;
+	else
+		q->flags = ifr.ifr_flags;
+
+	return 0;
+}
+
 /*
  * provide compatibility with generic tun/tap interface
  */
@@ -906,17 +945,7 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
 
 	switch (cmd) {
 	case TUNSETIFF:
-		/* ignore the name, just look at flags */
-		if (get_user(u, &ifr->ifr_flags))
-			return -EFAULT;
-
-		ret = 0;
-		if ((u & ~IFF_VNET_HDR) != (IFF_NO_PI | IFF_TAP))
-			ret = -EINVAL;
-		else
-			q->flags = u;
-
-		return ret;
+		return macvtap_set_iff(file, ifr);
 
 	case TUNGETIFF:
 		vlan = macvtap_get_vlan(q);
-- 
1.7.1

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