bpf: Set mac_len in bpf_skb_change_head
[ Upstream commit 84316ca4 ] The skb_change_head() helper did not set "skb->mac_len", which is problematic when it's used in combination with skb_redirect_peer(). Without it, redirecting a packet from a L3 device such as wireguard to the veth peer device will cause skb->data to point to the middle of the IP header on entry to tcp_v4_rcv() since the L2 header is not pulled correctly due to mac_len=0. Fixes: 3a0af8fd ("bpf: BPF for lightweight tunnel infrastructure") Signed-off-by:Jussi Maki <joamaki@gmail.com> Signed-off-by:
Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210519154743.2554771-2-joamaki@gmail.com Signed-off-by:
Sasha Levin <sashal@kernel.org>
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272729d5
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