Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.8 034/124] xfrmi: drop ignore_df check before updating pmtu | Date | Mon, 12 Oct 2020 15:30:38 +0200 |
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From: Sabrina Dubroca <sd@queasysnail.net>
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@redhat.com> Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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)) {
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