Commit 45a36a18 authored Aug 04, 2020 by Sabrina Dubroca Committed by Steffen Klassert Aug 27, 2020

xfrmi: drop ignore_df check before updating pmtu



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: f203b76d ("xfrm: Add virtual xfrm interfaces")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

parent 4eb2e134

net/xfrm/xfrm_interface.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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)) {

Admin message