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netfilter: move NAT Kconfig switches out of the iptables scope
Currently, the NAT configs depend on iptables and ip6tables. However, users should be capable of enabling NAT for nft without having to switch on iptables. Fix this by adding new specific IP_NF_NAT and IP6_NF_NAT config switches for iptables and ip6tables NAT support. I have also moved the original NF_NAT_IPV4 and NF_NAT_IPV6 configs out of the scope of iptables to make them independent of it. This patch also adds NETFILTER_XT_NAT which selects the xt_nat combo that provides snat/dnat for iptables. We cannot use NF_NAT anymore since nf_tables can select this. Reported-by: Matteo Croce <technoboy85@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Pablo Neira Ayuso
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2100968666
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8993cf8edf
@ -82,6 +82,52 @@ config NF_TABLES_ARP
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help
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This option enables the ARP support for nf_tables.
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config NF_NAT_IPV4
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tristate "IPv4 NAT"
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depends on NF_CONNTRACK_IPV4
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default m if NETFILTER_ADVANCED=n
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select NF_NAT
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help
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The IPv4 NAT option allows masquerading, port forwarding and other
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forms of full Network Address Port Translation. This can be
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controlled by iptables or nft.
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if NF_NAT_IPV4
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config NF_NAT_SNMP_BASIC
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tristate "Basic SNMP-ALG support"
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depends on NF_CONNTRACK_SNMP
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depends on NETFILTER_ADVANCED
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default NF_NAT && NF_CONNTRACK_SNMP
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---help---
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This module implements an Application Layer Gateway (ALG) for
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SNMP payloads. In conjunction with NAT, it allows a network
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management system to access multiple private networks with
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conflicting addresses. It works by modifying IP addresses
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inside SNMP payloads to match IP-layer NAT mapping.
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This is the "basic" form of SNMP-ALG, as described in RFC 2962
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To compile it as a module, choose M here. If unsure, say N.
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config NF_NAT_PROTO_GRE
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tristate
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depends on NF_CT_PROTO_GRE
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config NF_NAT_PPTP
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tristate
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depends on NF_CONNTRACK
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default NF_CONNTRACK_PPTP
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select NF_NAT_PROTO_GRE
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config NF_NAT_H323
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tristate
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depends on NF_CONNTRACK
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default NF_CONNTRACK_H323
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endif # NF_NAT_IPV4
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config IP_NF_IPTABLES
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tristate "IP tables support (required for filtering/masq/NAT)"
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default m if NETFILTER_ADVANCED=n
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@ -170,19 +216,21 @@ config IP_NF_TARGET_SYNPROXY
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To compile it as a module, choose M here. If unsure, say N.
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# NAT + specific targets: nf_conntrack
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config NF_NAT_IPV4
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tristate "IPv4 NAT"
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config IP_NF_NAT
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tristate "iptables NAT support"
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depends on NF_CONNTRACK_IPV4
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default m if NETFILTER_ADVANCED=n
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select NF_NAT
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select NF_NAT_IPV4
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select NETFILTER_XT_NAT
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help
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The IPv4 NAT option allows masquerading, port forwarding and other
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forms of full Network Address Port Translation. It is controlled by
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the `nat' table in iptables: see the man page for iptables(8).
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This enables the `nat' table in iptables. This allows masquerading,
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port forwarding and other forms of full Network Address Port
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Translation.
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To compile it as a module, choose M here. If unsure, say N.
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if NF_NAT_IPV4
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if IP_NF_NAT
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config IP_NF_TARGET_MASQUERADE
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tristate "MASQUERADE target support"
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@ -214,47 +262,7 @@ config IP_NF_TARGET_REDIRECT
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(e.g. when running oldconfig). It selects
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CONFIG_NETFILTER_XT_TARGET_REDIRECT.
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endif
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config NF_NAT_SNMP_BASIC
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tristate "Basic SNMP-ALG support"
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depends on NF_CONNTRACK_SNMP && NF_NAT_IPV4
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depends on NETFILTER_ADVANCED
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default NF_NAT && NF_CONNTRACK_SNMP
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---help---
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This module implements an Application Layer Gateway (ALG) for
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SNMP payloads. In conjunction with NAT, it allows a network
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management system to access multiple private networks with
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conflicting addresses. It works by modifying IP addresses
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inside SNMP payloads to match IP-layer NAT mapping.
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This is the "basic" form of SNMP-ALG, as described in RFC 2962
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To compile it as a module, choose M here. If unsure, say N.
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# If they want FTP, set to $CONFIG_IP_NF_NAT (m or y),
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# or $CONFIG_IP_NF_FTP (m or y), whichever is weaker.
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# From kconfig-language.txt:
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#
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# <expr> '&&' <expr> (6)
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#
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# (6) Returns the result of min(/expr/, /expr/).
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config NF_NAT_PROTO_GRE
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tristate
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depends on NF_NAT_IPV4 && NF_CT_PROTO_GRE
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config NF_NAT_PPTP
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tristate
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depends on NF_CONNTRACK && NF_NAT_IPV4
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default NF_NAT_IPV4 && NF_CONNTRACK_PPTP
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select NF_NAT_PROTO_GRE
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config NF_NAT_H323
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tristate
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depends on NF_CONNTRACK && NF_NAT_IPV4
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default NF_NAT_IPV4 && NF_CONNTRACK_H323
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endif # IP_NF_NAT
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# mangle + specific targets
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config IP_NF_MANGLE
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@ -43,7 +43,7 @@ obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
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# the three instances of ip_tables
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obj-$(CONFIG_IP_NF_FILTER) += iptable_filter.o
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obj-$(CONFIG_IP_NF_MANGLE) += iptable_mangle.o
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obj-$(CONFIG_NF_NAT_IPV4) += iptable_nat.o
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obj-$(CONFIG_IP_NF_NAT) += iptable_nat.o
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obj-$(CONFIG_IP_NF_RAW) += iptable_raw.o
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obj-$(CONFIG_IP_NF_SECURITY) += iptable_security.o
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@ -60,6 +60,16 @@ config NF_LOG_IPV6
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depends on NETFILTER_ADVANCED
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select NF_LOG_COMMON
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config NF_NAT_IPV6
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tristate "IPv6 NAT"
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depends on NF_CONNTRACK_IPV6
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depends on NETFILTER_ADVANCED
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select NF_NAT
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help
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The IPv6 NAT option allows masquerading, port forwarding and other
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forms of full Network Address Port Translation. This can be
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controlled by iptables or nft.
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config IP6_NF_IPTABLES
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tristate "IP6 tables support (required for filtering)"
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depends on INET && IPV6
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@ -232,19 +242,21 @@ config IP6_NF_SECURITY
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If unsure, say N.
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config NF_NAT_IPV6
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tristate "IPv6 NAT"
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config IP6_NF_NAT
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tristate "ip6tables NAT support"
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depends on NF_CONNTRACK_IPV6
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depends on NETFILTER_ADVANCED
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select NF_NAT
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select NF_NAT_IPV6
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select NETFILTER_XT_NAT
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help
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The IPv6 NAT option allows masquerading, port forwarding and other
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forms of full Network Address Port Translation. It is controlled by
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the `nat' table in ip6tables, see the man page for ip6tables(8).
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This enables the `nat' table in ip6tables. This allows masquerading,
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port forwarding and other forms of full Network Address Port
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Translation.
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To compile it as a module, choose M here. If unsure, say N.
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if NF_NAT_IPV6
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if IP6_NF_NAT
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config IP6_NF_TARGET_MASQUERADE
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tristate "MASQUERADE target support"
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@ -265,7 +277,7 @@ config IP6_NF_TARGET_NPT
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To compile it as a module, choose M here. If unsure, say N.
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endif # NF_NAT_IPV6
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endif # IP6_NF_NAT
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endif # IP6_NF_IPTABLES
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@ -8,7 +8,7 @@ obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
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obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
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obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
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obj-$(CONFIG_IP6_NF_SECURITY) += ip6table_security.o
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obj-$(CONFIG_NF_NAT_IPV6) += ip6table_nat.o
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obj-$(CONFIG_IP6_NF_NAT) += ip6table_nat.o
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# objects for l3 independent conntrack
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nf_conntrack_ipv6-y := nf_conntrack_l3proto_ipv6.o nf_conntrack_proto_icmpv6.o
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@ -95,7 +95,7 @@ obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o
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obj-$(CONFIG_NETFILTER_XT_MARK) += xt_mark.o
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obj-$(CONFIG_NETFILTER_XT_CONNMARK) += xt_connmark.o
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obj-$(CONFIG_NETFILTER_XT_SET) += xt_set.o
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obj-$(CONFIG_NF_NAT) += xt_nat.o
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obj-$(CONFIG_NETFILTER_XT_NAT) += xt_nat.o
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# targets
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obj-$(CONFIG_NETFILTER_XT_TARGET_AUDIT) += xt_AUDIT.o
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