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netfilter: nat: merge ipv4 and ipv6 masquerade functionality
Before:
text data bss dec hex filename
13916 1412 4128 19456 4c00 nf_nat.ko
4510 968 4 5482 156a nf_nat_ipv4.ko
5146 944 8 6098 17d2 nf_nat_ipv6.ko
After:
text data bss dec hex filename
16566 1576 4136 22278 5706 nf_nat.ko
3187 844 0 4031 fbf nf_nat_ipv4.ko
3598 844 0 4442 115a nf_nat_ipv6.ko
... so no drastic changes in combined size.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>