+static DEFINE_SPINLOCK(afinfo_lock);
+
+struct nf_afinfo *nf_afinfo[NPROTO];
+EXPORT_SYMBOL(nf_afinfo);
+
+int nf_register_afinfo(struct nf_afinfo *afinfo)
+{
+ spin_lock(&afinfo_lock);
+ rcu_assign_pointer(nf_afinfo[afinfo->family], afinfo);
+ spin_unlock(&afinfo_lock);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nf_register_afinfo);
+
+void nf_unregister_afinfo(struct nf_afinfo *afinfo)
+{
+ spin_lock(&afinfo_lock);
+ rcu_assign_pointer(nf_afinfo[afinfo->family], NULL);
+ spin_unlock(&afinfo_lock);
+ synchronize_rcu();
+}
+EXPORT_SYMBOL_GPL(nf_unregister_afinfo);
+