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+/*
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+ * Network event notifiers
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+ *
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+ * Authors:
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+ * Tom Tucker <tom@opengridcomputing.com>
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+ * Steve Wise <swise@opengridcomputing.com>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * as published by the Free Software Foundation; either version
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+ * 2 of the License, or (at your option) any later version.
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+ *
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+ * Fixes:
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+ */
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+
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+#include <linux/rtnetlink.h>
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+#include <linux/notifier.h>
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+
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+static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain);
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+
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+/**
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+ * register_netevent_notifier - register a netevent notifier block
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+ * @nb: notifier
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+ *
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+ * Register a notifier to be called when a netevent occurs.
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+ * The notifier passed is linked into the kernel structures and must
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+ * not be reused until it has been unregistered. A negative errno code
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+ * is returned on a failure.
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+ */
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+int register_netevent_notifier(struct notifier_block *nb)
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+{
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+ int err;
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+
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+ err = atomic_notifier_chain_register(&netevent_notif_chain, nb);
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+ return err;
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+}
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+
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+/**
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+ * netevent_unregister_notifier - unregister a netevent notifier block
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+ * @nb: notifier
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+ *
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+ * Unregister a notifier previously registered by
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+ * register_neigh_notifier(). The notifier is unlinked into the
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+ * kernel structures and may then be reused. A negative errno code
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+ * is returned on a failure.
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+ */
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+
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+int unregister_netevent_notifier(struct notifier_block *nb)
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+{
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+ return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
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+}
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+
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+/**
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+ * call_netevent_notifiers - call all netevent notifier blocks
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+ * @val: value passed unmodified to notifier function
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+ * @v: pointer passed unmodified to notifier function
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+ *
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+ * Call all neighbour notifier blocks. Parameters and return value
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+ * are as for notifier_call_chain().
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+ */
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+
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+int call_netevent_notifiers(unsigned long val, void *v)
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+{
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+ return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
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+}
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+
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+EXPORT_SYMBOL_GPL(register_netevent_notifier);
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+EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
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+EXPORT_SYMBOL_GPL(call_netevent_notifiers);
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