Move these options inside the scope of the 'if' NF_TABLES and
NF_TABLES_IPV6 dependencies. This patch fixes:

   net/ipv6/netfilter/nft_chain_nat_ipv6.o: In function `nft_nat_do_chain':
>> net/ipv6/netfilter/nft_chain_nat_ipv6.c:37: undefined reference to 
>> `nft_do_chain'
   net/ipv6/netfilter/nft_chain_nat_ipv6.o: In function 
`nft_chain_nat_ipv6_exit':
>> net/ipv6/netfilter/nft_chain_nat_ipv6.c:94: undefined reference to 
>> `nft_unregister_chain_type'
   net/ipv6/netfilter/nft_chain_nat_ipv6.o: In function 
`nft_chain_nat_ipv6_init':
>> net/ipv6/netfilter/nft_chain_nat_ipv6.c:87: undefined reference to 
>> `nft_register_chain_type'

that happens with:

CONFIG_NF_TABLES=m
CONFIG_NFT_CHAIN_NAT_IPV6=y

Fixes: 02c7b25e5f54 ("netfilter: nf_tables: build-in filter chain type")
Reported-by: kbuild test robot <l...@intel.com>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 net/ipv6/netfilter/Kconfig | 55 +++++++++++++++++++++++-----------------------
 1 file changed, 28 insertions(+), 27 deletions(-)

diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index ccbfa83e4bb0..ce77bcc2490c 100644
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -48,6 +48,34 @@ config NFT_CHAIN_ROUTE_IPV6
          fields such as the source, destination, flowlabel, hop-limit and
          the packet mark.
 
+if NF_NAT_IPV6
+
+config NFT_CHAIN_NAT_IPV6
+       tristate "IPv6 nf_tables nat chain support"
+       help
+         This option enables the "nat" chain for IPv6 in nf_tables. This
+         chain type is used to perform Network Address Translation (NAT)
+         packet transformations such as the source, destination address and
+         source and destination ports.
+
+config NFT_MASQ_IPV6
+       tristate "IPv6 masquerade support for nf_tables"
+       depends on NFT_MASQ
+       select NF_NAT_MASQUERADE_IPV6
+       help
+         This is the expression that provides IPv4 masquerading support for
+         nf_tables.
+
+config NFT_REDIR_IPV6
+       tristate "IPv6 redirect support for nf_tables"
+       depends on NFT_REDIR
+       select NF_NAT_REDIRECT
+       help
+         This is the expression that provides IPv4 redirect support for
+         nf_tables.
+
+endif # NF_NAT_IPV6
+
 config NFT_REJECT_IPV6
        select NF_REJECT_IPV6
        default NFT_REJECT
@@ -107,39 +135,12 @@ config NF_NAT_IPV6
 
 if NF_NAT_IPV6
 
-config NFT_CHAIN_NAT_IPV6
-       depends on NF_TABLES_IPV6
-       tristate "IPv6 nf_tables nat chain support"
-       help
-         This option enables the "nat" chain for IPv6 in nf_tables. This
-         chain type is used to perform Network Address Translation (NAT)
-         packet transformations such as the source, destination address and
-         source and destination ports.
-
 config NF_NAT_MASQUERADE_IPV6
        tristate "IPv6 masquerade support"
        help
          This is the kernel functionality to provide NAT in the masquerade
          flavour (automatic source address selection) for IPv6.
 
-config NFT_MASQ_IPV6
-       tristate "IPv6 masquerade support for nf_tables"
-       depends on NF_TABLES_IPV6
-       depends on NFT_MASQ
-       select NF_NAT_MASQUERADE_IPV6
-       help
-         This is the expression that provides IPv4 masquerading support for
-         nf_tables.
-
-config NFT_REDIR_IPV6
-       tristate "IPv6 redirect support for nf_tables"
-       depends on NF_TABLES_IPV6
-       depends on NFT_REDIR
-       select NF_NAT_REDIRECT
-       help
-         This is the expression that provides IPv4 redirect support for
-         nf_tables.
-
 endif # NF_NAT_IPV6
 
 config IP6_NF_IPTABLES
-- 
2.11.0

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