[PATCH 3/8] xfrmi: drop ignore_df check before updating pmtu

[Steffen Klassert]

From: Sabrina Dubroca <s...@queasysnail.net>

xfrm interfaces currently test for !skb->ignore_df when deciding
whether to update the pmtu on the skb's dst. Because of this, no pmtu
exception is created when we do something like:

    ping -s 1438 <dest>

By dropping this check, the pmtu exception will be created and the
next ping attempt will work.

Fixes: f203b76d7809 ("xfrm: Add virtual xfrm interfaces")
Reported-by: Xiumei Mu <x...@redhat.com>
Signed-off-by: Sabrina Dubroca <s...@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 net/xfrm/xfrm_interface.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index eb8181987620..a8f66112c52b 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -303,7 +303,7 @@ xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, 
struct flowi *fl)
        }
 
        mtu = dst_mtu(dst);
-       if (!skb->ignore_df && skb->len > mtu) {
+       if (skb->len > mtu) {
                skb_dst_update_pmtu_no_confirm(skb, mtu);
 
                if (skb->protocol == htons(ETH_P_IPV6)) {
-- 
2.17.1