ipv6: gre: fix ip6gre_err()
ip6gre_err() miscomputes grehlen (sizeof(ipv6h) is 4 or 8, not 40 as expected), and should take into account 'offset' parameter. Also uses pskb_may_pull() to cope with some fragged skbs Signed-off-by: NEric Dumazet <edumazet@google.com> Cc: Dmitry Kozlov <xeb@mail.ru> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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