netfilter: synproxy: extract SYNPROXY infrastructure from {ipt, ip6t}_SYNPROXY
Add common functions into nf_synproxy_core.c to prepare for nftables support.
The prototypes of the functions used by {ipt, ip6t}_SYNPROXY are in the new
file nf_synproxy.h
Signed-off-by:
Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by:
Pablo Neira Ayuso <pablo@netfilter.org>
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