netfilter: Fix switch statement warnings with recent gcc.

More recent GCC warns about two kinds of switch statement uses:

1) Switching on an enumeration, but not having an explicit case
   statement for all members of the enumeration.  To show the
   compiler this is intentional, we simply add a default case
   with nothing more than a break statement.

2) Switching on a boolean value.  I think this warning is dumb
   but nevertheless you get it wholesale with -Wswitch.

This patch cures all such warnings in netfilter.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>

5 files changed, 17 insertions, 3 deletions

diff --git a/net/bridge/netfilter/nft_reject_bridge.c b/net/bridge/netfilter/nft_reject_bridge.c
index 54a2fdf0f457..ae8141f409d9 100644
--- a/net/bridge/netfilter/nft_reject_bridge.c
+++ b/net/bridge/netfilter/nft_reject_bridge.c
@@ -371,6 +371,8 @@ static int nft_reject_bridge_dump(struct sk_buff *skb,
                 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
                         goto nla_put_failure;
                 break;
+        default:
+                break;
         }
 
         return 0;
diff --git a/net/ipv4/netfilter/nft_reject_ipv4.c b/net/ipv4/netfilter/nft_reject_ipv4.c
index 16a5d4d73d75..a7621faa9678 100644
--- a/net/ipv4/netfilter/nft_reject_ipv4.c
+++ b/net/ipv4/netfilter/nft_reject_ipv4.c
@@ -33,6 +33,8 @@ static void nft_reject_ipv4_eval(const struct nft_expr *expr,
         case NFT_REJECT_TCP_RST:
                 nf_send_reset(pkt->skb, pkt->ops->hooknum);
                 break;
+        default:
+                break;
         }
 
         data[NFT_REG_VERDICT].verdict = NF_DROP;
diff --git a/net/ipv6/netfilter/nft_reject_ipv6.c b/net/ipv6/netfilter/nft_reject_ipv6.c
index f73285924144..71c7be5ee43a 100644
--- a/net/ipv6/netfilter/nft_reject_ipv6.c
+++ b/net/ipv6/netfilter/nft_reject_ipv6.c
@@ -34,6 +34,8 @@ static void nft_reject_ipv6_eval(const struct nft_expr *expr,
         case NFT_REJECT_TCP_RST:
                 nf_send_reset6(net, pkt->skb, pkt->ops->hooknum);
                 break;
+        default:
+                break;
         }
 
         data[NFT_REG_VERDICT].verdict = NF_DROP;
diff --git a/net/netfilter/nft_compat.c b/net/netfilter/nft_compat.c
index 589b8487cd08..0d137c1ac889 100644
--- a/net/netfilter/nft_compat.c
+++ b/net/netfilter/nft_compat.c
@@ -321,11 +321,11 @@ static void nft_match_eval(const struct nft_expr *expr,
                 return;
         }
 
-        switch(ret) {
-        case true:
+        switch (ret ? 1 : 0) {
+        case 1:
                 data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
                 break;
-        case false:
+        case 0:
                 data[NFT_REG_VERDICT].verdict = NFT_BREAK;
                 break;
         }
diff --git a/net/netfilter/nft_ct.c b/net/netfilter/nft_ct.c
index cc5603016242..18d520e0ca0a 100644
--- a/net/netfilter/nft_ct.c
+++ b/net/netfilter/nft_ct.c
@@ -56,6 +56,8 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
                         state = NF_CT_STATE_BIT(ctinfo);
                 dest->data[0] = state;
                 return;
+        default:
+                break;
         }
 
         if (ct == NULL)
@@ -117,6 +119,8 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
                 return;
         }
 #endif
+        default:
+                break;
         }
 
         tuple = &ct->tuplehash[priv->dir].tuple;
@@ -141,6 +145,8 @@ static void nft_ct_get_eval(const struct nft_expr *expr,
         case NFT_CT_PROTO_DST:
                 dest->data[0] = (__force __u16)tuple->dst.u.all;
                 return;
+        default:
+                break;
         }
         return;
 err:
@@ -172,6 +178,8 @@ static void nft_ct_set_eval(const struct nft_expr *expr,
                 }
                 break;
 #endif
+        default:
+                break;
         }
 }