[NETFILTER]: nf_conntrack_netlink: clean up NAT protocol parsing

Move responsibility for setting the IP_NAT_RANGE_PROTO_SPECIFIED flag
to the NAT protocol, properly propagate errors and get rid of ugly
return value convention.

Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/ipv4/netfilter/nf_nat_proto_common.c b/net/ipv4/netfilter/nf_nat_proto_common.c
index ef4dc39..4904b86 100644 (file)
--- a/net/ipv4/netfilter/nf_nat_proto_common.c
+++ b/net/ipv4/netfilter/nf_nat_proto_common.c
@@ -105,24 +105,16 @@ EXPORT_SYMBOL_GPL(nf_nat_proto_nlattr_to_range);
 int nf_nat_proto_nlattr_to_range(struct nlattr *tb[],
                                 struct nf_nat_range *range)
 {
-       int ret = 0;
-
-       /* we have to return whether we actually parsed something or not */
-
        if (tb[CTA_PROTONAT_PORT_MIN]) {
-               ret = 1;
                range->min.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MIN]);
+               range->max.all = range->min.tcp.port;
+               range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
        }
-
-       if (!tb[CTA_PROTONAT_PORT_MAX]) {
-               if (ret)
-                       range->max.all = range->min.all;
-       } else {
-               ret = 1;
+       if (tb[CTA_PROTONAT_PORT_MAX]) {
                range->max.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MAX]);
+               range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
        }
-
-       return ret;
+       return 0;
 }
 EXPORT_SYMBOL_GPL(nf_nat_proto_range_to_nlattr);
 #endif

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 4a1b42b..79d5ecd 100644 (file)
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -705,19 +705,10 @@ static int nfnetlink_parse_nat_proto(struct nlattr *attr,
                return err;
 
        npt = nf_nat_proto_find_get(ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum);
-
-       if (!npt->nlattr_to_range) {
-               nf_nat_proto_put(npt);
-               return 0;
-       }
-
-       /* nlattr_to_range returns 1 if it parsed, 0 if not, neg. on error */
-       if (npt->nlattr_to_range(tb, range) > 0)
-               range->flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
-
+       if (npt->nlattr_to_range)
+               err = npt->nlattr_to_range(tb, range);
        nf_nat_proto_put(npt);
-
-       return 0;
+       return err;
 }
 
 static const struct nla_policy nat_nla_policy[CTA_NAT_MAX+1] = {