netfilter: remove forward module param confusion.

It used to be an int, and it got changed to a bool parameter at least
7 years ago.  It happens that NF_ACCEPT and NF_DROP are 0 and 1, so
this works, but it's unclear, and the check that it's in range is not
required.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 4 insertions, 14 deletions

diff --git a/net/ipv4/netfilter/iptable_filter.c b/net/ipv4/netfilter/iptable_filter.c
index 0e58f09e59fb..851acec852d2 100644
--- a/net/ipv4/netfilter/iptable_filter.c
+++ b/net/ipv4/netfilter/iptable_filter.c
@@ -52,7 +52,7 @@ iptable_filter_hook(unsigned int hook, struct sk_buff *skb,
 static struct nf_hook_ops *filter_ops __read_mostly;
 
 /* Default to forward because I got too much mail already. */
-static bool forward = NF_ACCEPT;
+static bool forward = true;
 module_param(forward, bool, 0000);
 
 static int __net_init iptable_filter_net_init(struct net *net)
@@ -64,7 +64,7 @@ static int __net_init iptable_filter_net_init(struct net *net)
                 return -ENOMEM;
         /* Entry 1 is the FORWARD hook */
         ((struct ipt_standard *)repl->entries)[1].target.verdict =
-                -forward - 1;
+                forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
 
         net->ipv4.iptable_filter =
                 ipt_register_table(net, &packet_filter, repl);
@@ -88,11 +88,6 @@ static int __init iptable_filter_init(void)
 {
         int ret;
 
-        if (forward < 0 || forward > NF_MAX_VERDICT) {
-                pr_err("iptables forward must be 0 or 1\n");
-                return -EINVAL;
-        }
-
         ret = register_pernet_subsys(&iptable_filter_net_ops);
         if (ret < 0)
                 return ret;
diff --git a/net/ipv6/netfilter/ip6table_filter.c b/net/ipv6/netfilter/ip6table_filter.c
index a8f6da97e3b2..325e59a0224f 100644
--- a/net/ipv6/netfilter/ip6table_filter.c
+++ b/net/ipv6/netfilter/ip6table_filter.c
@@ -44,7 +44,7 @@ ip6table_filter_hook(unsigned int hook, struct sk_buff *skb,
 static struct nf_hook_ops *filter_ops __read_mostly;
 
 /* Default to forward because I got too much mail already. */
-static bool forward = NF_ACCEPT;
+static bool forward = true;
 module_param(forward, bool, 0000);
 
 static int __net_init ip6table_filter_net_init(struct net *net)
@@ -56,7 +56,7 @@ static int __net_init ip6table_filter_net_init(struct net *net)
                 return -ENOMEM;
         /* Entry 1 is the FORWARD hook */
         ((struct ip6t_standard *)repl->entries)[1].target.verdict =
-                -forward - 1;
+                forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
 
         net->ipv6.ip6table_filter =
                 ip6t_register_table(net, &packet_filter, repl);
@@ -80,11 +80,6 @@ static int __init ip6table_filter_init(void)
 {
         int ret;
 
-        if (forward < 0 || forward > NF_MAX_VERDICT) {
-                pr_err("iptables forward must be 0 or 1\n");
-                return -EINVAL;
-        }
-
         ret = register_pernet_subsys(&ip6table_filter_net_ops);
         if (ret < 0)
                 return ret;