batman-adv: Fix potentially broken skb network header access
commit 53cf037b upstream. The two commits noted below added calls to ip_hdr() and ipv6_hdr(). They need a correctly set skb network header. Unfortunately we cannot rely on the device drivers to set it for us. Therefore setting it in the beginning of the according ndo_start_xmit handler. Fixes: 1d8ab8d3 ("batman-adv: Modified forwarding behaviour for multicast packets") Fixes: ab49886e ("batman-adv: Add IPv4 link-local/IPv6-ll-all-nodes multicast support") Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@meshcoding.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
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