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authorShmulik Ladkani <shmulik.ladkani@gmail.com>2016-06-29 21:47:03 +0300
committerDavid S. Miller <davem@davemloft.net>2016-06-30 09:02:48 -0400
commitfedbb6b4ff341c1e2120f4ffbf367fd78ac3e8f3 (patch)
treeaec9b6ddce0a103d82704f52a693f1d3cd238dbb /drivers/net
parent5ab0d6a016b19d8cbd503eafd0ef701cfd854402 (diff)
downloadlinux-fedbb6b4ff341c1e2120f4ffbf367fd78ac3e8f3.tar.gz
ipv4: Fix ip_skb_dst_mtu to use the sk passed by ip_finish_output
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.ladkani@gmail.com> Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
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