[NETFILTER]: Kconfig: improve dependency handling

Instead of depending on internally needed options and letting users
figure out what is needed, select them when needed:

- IP_NF_IPTABLES, IP_NF_ARPTABLES and IP6_NF_IPTABLES select
  NETFILTER_XTABLES

- NETFILTER_XT_TARGET_CONNMARK, NETFILTER_XT_MATCH_CONNMARK and
  IP_NF_TARGET_CLUSTERIP select NF_CONNTRACK_MARK

- NETFILTER_XT_MATCH_CONNBYTES selects NF_CT_ACCT
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv4/netfilter/Kconfig

@@ -226,7 +226,7 @@ config IP_NF_QUEUE
 
 config IP_NF_IPTABLES
 	tristate "IP tables support (required for filtering/masq/NAT)"
-	depends on NETFILTER_XTABLES
+	select NETFILTER_XTABLES
 	help
 	  iptables is a general, extensible packet identification framework.
 	  The packet filtering and full NAT (masquerading, port forwarding,
@@ -606,7 +606,9 @@ config IP_NF_TARGET_TTL
 config IP_NF_TARGET_CLUSTERIP
 	tristate "CLUSTERIP target support (EXPERIMENTAL)"
 	depends on IP_NF_MANGLE && EXPERIMENTAL
-	depends on (IP_NF_CONNTRACK && IP_NF_CONNTRACK_MARK) || (NF_CONNTRACK_MARK && NF_CONNTRACK_IPV4)
+	depends on IP_NF_CONNTRACK || NF_CONNTRACK_IPV4
+	select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
+	select NF_CONNTRACK_MARK if NF_CONNTRACK_IPV4
 	help
 	  The CLUSTERIP target allows you to build load-balancing clusters of
 	  network servers without having a dedicated load-balancing
@@ -629,7 +631,7 @@ config IP_NF_RAW
 # ARP tables
 config IP_NF_ARPTABLES
 	tristate "ARP tables support"
-	depends on NETFILTER_XTABLES
+	select NETFILTER_XTABLES
 	help
 	  arptables is a general, extensible packet identification framework.
 	  The ARP packet filtering and mangling (manipulation)subsystems

net/ipv6/netfilter/Kconfig

@@ -42,7 +42,8 @@ config IP6_NF_QUEUE
 
 config IP6_NF_IPTABLES
 	tristate "IP6 tables support (required for filtering)"
-	depends on INET && IPV6 && EXPERIMENTAL && NETFILTER_XTABLES
+	depends on INET && IPV6 && EXPERIMENTAL
+	select NETFILTER_XTABLES
 	help
 	  ip6tables is a general, extensible packet identification framework.
 	  Currently only the packet filtering and packet mangling subsystem

net/netfilter/Kconfig

@@ -302,7 +302,9 @@ config NETFILTER_XT_TARGET_CONNMARK
 	tristate  '"CONNMARK" target support'
 	depends on NETFILTER_XTABLES
 	depends on IP_NF_MANGLE || IP6_NF_MANGLE
-	depends on (IP_NF_CONNTRACK && IP_NF_CONNTRACK_MARK) || (NF_CONNTRACK_MARK && NF_CONNTRACK)
+	depends on IP_NF_CONNTRACK || NF_CONNTRACK
+	select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
+	select NF_CONNTRACK_MARK if NF_CONNTRACK
 	help
 	  This option adds a `CONNMARK' target, which allows one to manipulate
 	  the connection mark value.  Similar to the MARK target, but
@@ -434,7 +436,9 @@ config NETFILTER_XT_MATCH_COMMENT
 config NETFILTER_XT_MATCH_CONNBYTES
 	tristate  '"connbytes" per-connection counter match support'
 	depends on NETFILTER_XTABLES
-	depends on (IP_NF_CONNTRACK && IP_NF_CT_ACCT) || (NF_CT_ACCT && NF_CONNTRACK)
+	depends on IP_NF_CONNTRACK || NF_CONNTRACK
+	select IP_NF_CT_ACCT if IP_NF_CONNTRACK
+	select NF_CT_ACCT if NF_CONNTRACK
 	help
 	  This option adds a `connbytes' match, which allows you to match the
 	  number of bytes and/or packets for each direction within a connection.
@@ -445,7 +449,9 @@ config NETFILTER_XT_MATCH_CONNBYTES
 config NETFILTER_XT_MATCH_CONNMARK
 	tristate  '"connmark" connection mark match support'
 	depends on NETFILTER_XTABLES
-	depends on (IP_NF_CONNTRACK && IP_NF_CONNTRACK_MARK) || (NF_CONNTRACK_MARK && NF_CONNTRACK)
+	depends on IP_NF_CONNTRACK || NF_CONNTRACK
+	select IP_NF_CONNTRACK_MARK if IP_NF_CONNTRACK
+	select NF_CONNTRACK_MARK if NF_CONNTRACK
 	help
 	  This option adds a `connmark' match, which allows you to match the
 	  connection mark value previously set for the session by `CONNMARK'.