From: Shmulik Ladkani <shmulik.ladk...@gmail.com> Date: Wed, 29 Jun 2016 21:47:03 +0300
> ip_skb_dst_mtu uses skb->sk, assuming it is an AF_INET socket (e.g. it > calls ip_sk_use_pmtu which casts sk as an inet_sk). > > However, in the case of UDP tunneling, the skb->sk is not necessarily an > inet socket (could be AF_PACKET socket, or AF_UNSPEC if arriving from > tun/tap). > > OTOH, the sk passed as an argument throughout IP stack's output path is > the one which is of PMTU interest: > - In case of local sockets, sk is same as skb->sk; > - In case of a udp tunnel, sk is the tunneling socket. > > Fix, by passing ip_finish_output's sk to ip_skb_dst_mtu. > This augments 7026b1ddb6 'netfilter: Pass socket pointer down through okfn().' > > Signed-off-by: Shmulik Ladkani <shmulik.ladk...@gmail.com> Applied, thanks.
