netfilter: xtables: generate initial table on-demand

The static initial tables are pretty large, and after the net
namespace has been instantiated, they just hang around for nothing.
This commit removes them and creates tables on-demand at runtime when
needed.

Size shrinks by 7735 bytes (x86_64).

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

3 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/netfilter_arp/arp_tables.h b/include/linux/netfilter_arp/arp_tables.h
index f2336523a9df..0b33980611b2 100644
--- a/include/linux/netfilter_arp/arp_tables.h
+++ b/include/linux/netfilter_arp/arp_tables.h
@@ -258,6 +258,7 @@ struct arpt_error {
         .target.errorname = "ERROR",                                           \
 }
 
+extern void *arpt_alloc_initial_table(const struct xt_table *);
 extern struct xt_table *arpt_register_table(struct net *net,
                                             const struct xt_table *table,
                                             const struct arpt_replace *repl);
diff --git a/include/linux/netfilter_ipv4/ip_tables.h b/include/linux/netfilter_ipv4/ip_tables.h
index 8d1f273d350b..364973b42133 100644
--- a/include/linux/netfilter_ipv4/ip_tables.h
+++ b/include/linux/netfilter_ipv4/ip_tables.h
@@ -282,6 +282,7 @@ struct ipt_error {
         .target.errorname = "ERROR",                                           \
 }
 
+extern void *ipt_alloc_initial_table(const struct xt_table *);
 extern unsigned int ipt_do_table(struct sk_buff *skb,
                                  unsigned int hook,
                                  const struct net_device *in,
diff --git a/include/linux/netfilter_ipv6/ip6_tables.h b/include/linux/netfilter_ipv6/ip6_tables.h
index d2952d2fa658..8031eb486a10 100644
--- a/include/linux/netfilter_ipv6/ip6_tables.h
+++ b/include/linux/netfilter_ipv6/ip6_tables.h
@@ -297,6 +297,7 @@ ip6t_get_target(struct ip6t_entry *e)
 #include <linux/init.h>
 extern void ip6t_init(void) __init;
 
+extern void *ip6t_alloc_initial_table(const struct xt_table *);
 extern struct xt_table *ip6t_register_table(struct net *net,
                                             const struct xt_table *table,
                                             const struct ip6t_replace *repl);