#include "nf_internals.h"
+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);
+
/* In this code, we can be waiting indefinitely for userspace to
* service a packet if a hook returns NF_QUEUE. We could keep a count
* of skbuffs queued for userspace, and not deregister a hook unless