[NET]: Network Event Notifier Mechanism.

This patch uses notifier blocks to implement a network event
notifier mechanism.

Clients register their callback function by calling
register_netevent_notifier() like this:

static struct notifier_block nb = {
        .notifier_call = my_callback_func
};

...

register_netevent_notifier(&nb);

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/netevent.h b/include/net/netevent.h
new file mode 100644 (file)
index 0000000..e5d2162
--- /dev/null
+++ b/include/net/netevent.h
@@ -0,0 +1,33 @@
+#ifndef _NET_EVENT_H
+#define _NET_EVENT_H
+
+/*
+ *     Generic netevent notifiers
+ *
+ *     Authors:
+ *      Tom Tucker              <tom@opengridcomputing.com>
+ *      Steve Wise              <swise@opengridcomputing.com>
+ *
+ *     Changes:
+ */
+#ifdef __KERNEL__
+
+#include <net/dst.h>
+
+struct netevent_redirect {
+       struct dst_entry *old;
+       struct dst_entry *new;
+};
+
+enum netevent_notif_type {
+       NETEVENT_NEIGH_UPDATE = 1, /* arg is struct neighbour ptr */
+       NETEVENT_PMTU_UPDATE,      /* arg is struct dst_entry ptr */
+       NETEVENT_REDIRECT,         /* arg is struct netevent_redirect ptr */
+};
+
+extern int register_netevent_notifier(struct notifier_block *nb);
+extern int unregister_netevent_notifier(struct notifier_block *nb);
+extern int call_netevent_notifiers(unsigned long val, void *v);
+
+#endif
+#endif

diff --git a/net/core/netevent.c b/net/core/netevent.c
new file mode 100644 (file)
index 0000000..35d02c3
--- /dev/null
+++ b/net/core/netevent.c
@@ -0,0 +1,69 @@
+/*
+ *     Network event notifiers
+ *
+ *     Authors:
+ *      Tom Tucker             <tom@opengridcomputing.com>
+ *      Steve Wise             <swise@opengridcomputing.com>
+ *
+ *     This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ *
+ *     Fixes:
+ */
+
+#include <linux/rtnetlink.h>
+#include <linux/notifier.h>
+
+static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain);
+
+/**
+ *     register_netevent_notifier - register a netevent notifier block
+ *     @nb: notifier
+ *
+ *     Register a notifier to be called when a netevent occurs.
+ *     The notifier passed is linked into the kernel structures and must
+ *     not be reused until it has been unregistered. A negative errno code
+ *     is returned on a failure.
+ */
+int register_netevent_notifier(struct notifier_block *nb)
+{
+       int err;
+
+       err = atomic_notifier_chain_register(&netevent_notif_chain, nb);
+       return err;
+}
+
+/**
+ *     netevent_unregister_notifier - unregister a netevent notifier block
+ *     @nb: notifier
+ *
+ *     Unregister a notifier previously registered by
+ *     register_neigh_notifier(). The notifier is unlinked into the
+ *     kernel structures and may then be reused. A negative errno code
+ *     is returned on a failure.
+ */
+
+int unregister_netevent_notifier(struct notifier_block *nb)
+{
+       return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
+}
+
+/**
+ *     call_netevent_notifiers - call all netevent notifier blocks
+ *      @val: value passed unmodified to notifier function
+ *      @v:   pointer passed unmodified to notifier function
+ *
+ *     Call all neighbour notifier blocks.  Parameters and return value
+ *     are as for notifier_call_chain().
+ */
+
+int call_netevent_notifiers(unsigned long val, void *v)
+{
+       return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
+}
+
+EXPORT_SYMBOL_GPL(register_netevent_notifier);
+EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
+EXPORT_SYMBOL_GPL(call_netevent_notifiers);