[NETFILTER] nfnetlink: nfattr_parse() can never fail, make it void

nfattr_parse (and thus nfattr_parse_nested) always returns success. So we
can make them 'void' and remove all the checking at the caller side.

Based on original patch by Pablo Neira Ayuso <pablo@netfilter.org>

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 10 insertions, 45 deletions

diff --git a/net/ipv4/netfilter/ip_conntrack_netlink.c b/net/ipv4/netfilter/ip_conntrack_netlink.c
index 02f303c..838262e 100644
--- a/net/ipv4/netfilter/ip_conntrack_netlink.c
+++ b/net/ipv4/netfilter/ip_conntrack_netlink.c
@@ -482,9 +482,7 @@ ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
 
 	DEBUGP("entered %s\n", __FUNCTION__);
 
-	
-	if (nfattr_parse_nested(tb, CTA_IP_MAX, attr) < 0)
-		goto nfattr_failure;
+	nfattr_parse_nested(tb, CTA_IP_MAX, attr);
 
 	if (nfattr_bad_size(tb, CTA_IP_MAX, cta_min_ip))
 		return -EINVAL;
@@ -500,9 +498,6 @@ ctnetlink_parse_tuple_ip(struct nfattr *attr, struct ip_conntrack_tuple *tuple)
 	DEBUGP("leaving\n");
 
 	return 0;
-
-nfattr_failure:
-	return -1;
 }
 
 static const int cta_min_proto[CTA_PROTO_MAX] = {
@@ -524,8 +519,7 @@ ctnetlink_parse_tuple_proto(struct nfattr *attr,
 
 	DEBUGP("entered %s\n", __FUNCTION__);
 
-	if (nfattr_parse_nested(tb, CTA_PROTO_MAX, attr) < 0)
-		goto nfattr_failure;
+	nfattr_parse_nested(tb, CTA_PROTO_MAX, attr);
 
 	if (nfattr_bad_size(tb, CTA_PROTO_MAX, cta_min_proto))
 		return -EINVAL;
@@ -542,9 +536,6 @@ ctnetlink_parse_tuple_proto(struct nfattr *attr,
 	}
 	
 	return ret;
-
-nfattr_failure:
-	return -1;
 }
 
 static inline int
@@ -558,8 +549,7 @@ ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
 
 	memset(tuple, 0, sizeof(*tuple));
 
-	if (nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]) < 0)
-		goto nfattr_failure;
+	nfattr_parse_nested(tb, CTA_TUPLE_MAX, cda[type-1]);
 
 	if (!tb[CTA_TUPLE_IP-1])
 		return -EINVAL;
@@ -586,9 +576,6 @@ ctnetlink_parse_tuple(struct nfattr *cda[], struct ip_conntrack_tuple *tuple,
 	DEBUGP("leaving\n");
 
 	return 0;
-
-nfattr_failure:
-	return -1;
 }
 
 #ifdef CONFIG_IP_NF_NAT_NEEDED
@@ -606,11 +593,10 @@ static int ctnetlink_parse_nat_proto(struct nfattr *attr,
 
 	DEBUGP("entered %s\n", __FUNCTION__);
 
-	if (nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr) < 0)
-		goto nfattr_failure;
+	nfattr_parse_nested(tb, CTA_PROTONAT_MAX, attr);
 
 	if (nfattr_bad_size(tb, CTA_PROTONAT_MAX, cta_min_protonat))
-		goto nfattr_failure;
+		return -1;
 
 	npt = ip_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
 	if (!npt)
@@ -629,9 +615,6 @@ static int ctnetlink_parse_nat_proto(struct nfattr *attr,
 
 	DEBUGP("leaving\n");
 	return 0;
-
-nfattr_failure:
-	return -1;
 }
 
 static inline int
@@ -645,8 +628,7 @@ ctnetlink_parse_nat(struct nfattr *cda[],
 
 	memset(range, 0, sizeof(*range));
 	
-	if (nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]) < 0)
-		goto nfattr_failure;
+	nfattr_parse_nested(tb, CTA_NAT_MAX, cda[CTA_NAT-1]);
 
 	if (tb[CTA_NAT_MINIP-1])
 		range->min_ip = *(u_int32_t *)NFA_DATA(tb[CTA_NAT_MINIP-1]);
@@ -668,9 +650,6 @@ ctnetlink_parse_nat(struct nfattr *cda[],
 
 	DEBUGP("leaving\n");
 	return 0;
-
-nfattr_failure:
-	return -1;
 }
 #endif
 
@@ -681,8 +660,7 @@ ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
 
 	DEBUGP("entered %s\n", __FUNCTION__);
 
-	if (nfattr_parse_nested(tb, CTA_HELP_MAX, attr) < 0)
-		goto nfattr_failure;
+	nfattr_parse_nested(tb, CTA_HELP_MAX, attr);
 
 	if (!tb[CTA_HELP_NAME-1])
 		return -EINVAL;
@@ -690,9 +668,6 @@ ctnetlink_parse_help(struct nfattr *attr, char **helper_name)
 	*helper_name = NFA_DATA(tb[CTA_HELP_NAME-1]);
 
 	return 0;
-
-nfattr_failure:
-	return -1;
 }
 
 static int
@@ -960,8 +935,7 @@ ctnetlink_change_protoinfo(struct ip_conntrack *ct, struct nfattr *cda[])
 	u_int16_t npt = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
 	int err = 0;
 
-	if (nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr) < 0)
-		goto nfattr_failure;
+	nfattr_parse_nested(tb, CTA_PROTOINFO_MAX, attr);
 
 	proto = ip_conntrack_proto_find_get(npt);
 	if (!proto)
@@ -972,9 +946,6 @@ ctnetlink_change_protoinfo(struct ip_conntrack *ct, struct nfattr *cda[])
 	ip_conntrack_proto_put(proto); 
 
 	return err;
-
-nfattr_failure:
-	return -ENOMEM;
 }
 
 static int
diff --git a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
index d6701ca..6ea4b22 100644
--- a/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
+++ b/net/ipv4/netfilter/ip_conntrack_proto_tcp.c
@@ -362,8 +362,7 @@ static int nfattr_to_tcp(struct nfattr *cda[], struct ip_conntrack *ct)
 	struct nfattr *attr = cda[CTA_PROTOINFO_TCP-1];
 	struct nfattr *tb[CTA_PROTOINFO_TCP_MAX];
 
-        if (nfattr_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr) < 0)
-                goto nfattr_failure;
+        nfattr_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr);
 
 	if (!tb[CTA_PROTOINFO_TCP_STATE-1])
 		return -EINVAL;
@@ -374,9 +373,6 @@ static int nfattr_to_tcp(struct nfattr *cda[], struct ip_conntrack *ct)
 	write_unlock_bh(&tcp_lock);
 
 	return 0;
-
-nfattr_failure:
-	return -1;
 }
 #endif
 
diff --git a/net/netfilter/nfnetlink.c b/net/netfilter/nfnetlink.c
index 4bc27a6..f8bd7c7 100644
--- a/net/netfilter/nfnetlink.c
+++ b/net/netfilter/nfnetlink.c
@@ -128,7 +128,7 @@ void __nfa_fill(struct sk_buff *skb, int attrtype, int attrlen,
 	memset(NFA_DATA(nfa) + attrlen, 0, NFA_ALIGN(size) - size);
 }
 
-int nfattr_parse(struct nfattr *tb[], int maxattr, struct nfattr *nfa, int len)
+void nfattr_parse(struct nfattr *tb[], int maxattr, struct nfattr *nfa, int len)
 {
 	memset(tb, 0, sizeof(struct nfattr *) * maxattr);
 
@@ -138,8 +138,6 @@ int nfattr_parse(struct nfattr *tb[], int maxattr, struct nfattr *nfa, int len)
 			tb[flavor-1] = nfa;
 		nfa = NFA_NEXT(nfa, len);
 	}
-
-	return 0;
 }
 
 /**