netfilter: nf_nat: support IPv6 in amanda NAT helper

Signed-off-by: Patrick McHardy <kaber@trash.net>

net/ipv4/netfilter/Kconfig

@@ -231,11 +231,6 @@ config NF_NAT_TFTP
 	depends on NF_CONNTRACK && NF_NAT_IPV4
 	default NF_NAT_IPV4 && NF_CONNTRACK_TFTP
 
-config NF_NAT_AMANDA
-	tristate
-	depends on NF_CONNTRACK && NF_NAT_IPV4
-	default NF_NAT_IPV4 && NF_CONNTRACK_AMANDA
-
 config NF_NAT_PPTP
 	tristate
 	depends on NF_CONNTRACK && NF_NAT_IPV4

net/ipv4/netfilter/Makefile

@@ -20,7 +20,6 @@ obj-$(CONFIG_NF_NAT_IPV4) += nf_nat_ipv4.o
 obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o
 
 # NAT helpers (nf_conntrack)
-obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
 obj-$(CONFIG_NF_NAT_H323) += nf_nat_h323.o
 obj-$(CONFIG_NF_NAT_IRC) += nf_nat_irc.o
 obj-$(CONFIG_NF_NAT_PPTP) += nf_nat_pptp.o

net/netfilter/Kconfig

@@ -380,6 +380,11 @@ config NF_NAT_PROTO_SCTP
 	depends on NF_NAT && NF_CT_PROTO_SCTP
 	select LIBCRC32C
 
+config NF_NAT_AMANDA
+	tristate
+	depends on NF_CONNTRACK && NF_NAT
+	default NF_NAT && NF_CONNTRACK_AMANDA
+
 config NF_NAT_FTP
 	tristate
 	depends on NF_CONNTRACK && NF_NAT

net/netfilter/Makefile

@@ -55,6 +55,7 @@ obj-$(CONFIG_NF_NAT_PROTO_UDPLITE) += nf_nat_proto_udplite.o
 obj-$(CONFIG_NF_NAT_PROTO_SCTP) += nf_nat_proto_sctp.o
 
 # NAT helpers
+obj-$(CONFIG_NF_NAT_AMANDA) += nf_nat_amanda.o
 obj-$(CONFIG_NF_NAT_FTP) += nf_nat_ftp.o
 
 # transparent proxy support

net/netfilter/nf_conntrack_amanda.c

@@ -155,8 +155,7 @@ static int amanda_help(struct sk_buff *skb,
 				  IPPROTO_TCP, NULL, &port);
 
 		nf_nat_amanda = rcu_dereference(nf_nat_amanda_hook);
-		if (nf_nat_amanda && nf_ct_l3num(ct) == NFPROTO_IPV4 &&
-		    ct->status & IPS_NAT_MASK)
+		if (nf_nat_amanda && ct->status & IPS_NAT_MASK)
 			ret = nf_nat_amanda(skb, ctinfo, protoff,
 					    off - dataoff, len, exp);
 		else if (nf_ct_expect_related(exp) != 0)