netfilter: ctnetlink: remove remaining module refcounting

Convert the remaining refcount users.

As pointed out by Patrick McHardy, the protocols can be accessed safely using RCU.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 9fb7cf7504fa600d958894f47250d93a2af1c41d..735ea9c1a96fff2f64c5ba8291ec68c534c57dc2 100644 (file)
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -599,7 +599,8 @@ ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
 
        nla_parse_nested(tb, CTA_IP_MAX, attr, NULL);
 
-       l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
+       rcu_read_lock();
+       l3proto = __nf_ct_l3proto_find(tuple->src.l3num);
 
        if (likely(l3proto->nlattr_to_tuple)) {
                ret = nla_validate_nested(attr, CTA_IP_MAX,
@@ -608,7 +609,7 @@ ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple)
                        ret = l3proto->nlattr_to_tuple(tb, tuple);
        }
 
-       nf_ct_l3proto_put(l3proto);
+       rcu_read_unlock();
 
        return ret;
 }
@@ -633,7 +634,8 @@ ctnetlink_parse_tuple_proto(struct nlattr *attr,
                return -EINVAL;
        tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
 
-       l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
+       rcu_read_lock();
+       l4proto = __nf_ct_l4proto_find(tuple->src.l3num, tuple->dst.protonum);
 
        if (likely(l4proto->nlattr_to_tuple)) {
                ret = nla_validate_nested(attr, CTA_PROTO_MAX,
@@ -642,7 +644,7 @@ ctnetlink_parse_tuple_proto(struct nlattr *attr,
                        ret = l4proto->nlattr_to_tuple(tb, tuple);
        }
 
-       nf_ct_l4proto_put(l4proto);
+       rcu_read_unlock();
 
        return ret;
 }
@@ -989,10 +991,11 @@ ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[])
 
        nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL);
 
-       l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct));
+       rcu_read_lock();
+       l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
        if (l4proto->from_nlattr)
                err = l4proto->from_nlattr(tb, ct);
-       nf_ct_l4proto_put(l4proto);
+       rcu_read_unlock();
 
        return err;
 }