From: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
commit 45a36a18d01907710bad5258d81f76c18882ad88 upstream.
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 <xmu@xxxxxxxxxx>
Signed-off-by: Sabrina Dubroca <sd@xxxxxxxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_interface.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -292,7 +292,7 @@ xfrmi_xmit2(struct sk_buff *skb, struct
}
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)) {
