From: Vlad Yasevich <vyasevic@redhat.com>
Date: Fri, 16 Aug 2013 19:25:01 +0000 (-0400)
Subject: macvtap: Correctly set tap features when IFF_VNET_HDR is disabled.
X-Git-Tag: firefly_0821_release~176^2~5516^2~15
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e558b0188bb7e35ffc4d35253c6b9ea491f3b996;p=firefly-linux-kernel-4.4.55.git

macvtap: Correctly set tap features when IFF_VNET_HDR is disabled.

When the user turns off IFF_VNET_HDR flag, attempts to change
offload features via TUNSETOFFLOAD do not work.  This could cause
GSO packets to be delivered to the user when the user is
not prepared to handle them.

To solve, allow processing of TUNSETOFFLOAD when IFF_VNET_HDR is
disabled.

Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 448f8a505cd9..4acfbce63a7d 100644
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -1163,10 +1163,6 @@ static long macvtap_ioctl(struct file *file, unsigned int cmd,
 			    TUN_F_TSO_ECN | TUN_F_UFO))
 			return -EINVAL;
 
-		/* TODO: only accept frames with the features that
-			 got enabled for forwarded frames */
-		if (!(q->flags & IFF_VNET_HDR))
-			return  -EINVAL;
 		rtnl_lock();
 		ret = set_offload(q, arg);
 		rtnl_unlock();