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bpf: Move skb->len == 0 checks into __bpf_redirect
[ Upstream commit 114039b ] To avoid potentially breaking existing users. Both mac/no-mac cases have to be amended; mac_header >= network_header is not enough (verified with a new test, see next patch). Fixes: fd18942 ("bpf: Don't redirect packets with invalid pkt_len") Signed-off-by: Stanislav Fomichev <sdf@google.com> Link: https://lore.kernel.org/r/20221121180340.1983627-1-sdf@google.com Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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