netfilter: xt_nat: fix incorrect hooks for SNAT and DNAT targets

In (c7232c99 netfilter: add protocol independent NAT core), the
hooks were accidentally modified:

SNAT hooks are POST_ROUTING and LOCAL_IN (before it was LOCAL_OUT).
DNAT hooks are PRE_ROUTING and LOCAL_OUT (before it was LOCAL_IN).
Signed-off-by: Elison Niven <elison.niven@cyberoam.com>
Signed-off-by: Sanket Shah <sanket.shah@cyberoam.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/xt_nat.c

@@ -111,7 +111,7 @@ static struct xt_target xt_nat_target_reg[] __read_mostly = {
 		.family		= NFPROTO_IPV4,
 		.table		= "nat",
 		.hooks		= (1 << NF_INET_POST_ROUTING) |
-				  (1 << NF_INET_LOCAL_OUT),
+				  (1 << NF_INET_LOCAL_IN),
 		.me		= THIS_MODULE,
 	},
 	{
@@ -123,7 +123,7 @@ static struct xt_target xt_nat_target_reg[] __read_mostly = {
 		.family		= NFPROTO_IPV4,
 		.table		= "nat",
 		.hooks		= (1 << NF_INET_PRE_ROUTING) |
-				  (1 << NF_INET_LOCAL_IN),
+				  (1 << NF_INET_LOCAL_OUT),
 		.me		= THIS_MODULE,
 	},
 	{
@@ -133,7 +133,7 @@ static struct xt_target xt_nat_target_reg[] __read_mostly = {
 		.targetsize	= sizeof(struct nf_nat_range),
 		.table		= "nat",
 		.hooks		= (1 << NF_INET_POST_ROUTING) |
-				  (1 << NF_INET_LOCAL_OUT),
+				  (1 << NF_INET_LOCAL_IN),
 		.me		= THIS_MODULE,
 	},
 	{
@@ -143,7 +143,7 @@ static struct xt_target xt_nat_target_reg[] __read_mostly = {
 		.targetsize	= sizeof(struct nf_nat_range),
 		.table		= "nat",
 		.hooks		= (1 << NF_INET_PRE_ROUTING) |
-				  (1 << NF_INET_LOCAL_IN),
+				  (1 << NF_INET_LOCAL_OUT),
 		.me		= THIS_MODULE,
 	},
 };