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The br_netfilter frag output function calls skb_cow_head() so in case it needs a larger headroom to e.g. re-add a previously stripped PPPOE or VLAN header things will still work (at cost of reallocation). We can then move nf_bridge_encap_header_len to br_netfilter. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>