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net: add support for netdev notifier error injection

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This module allows to insert errors in some of netdevice's notifier
events. All network drivers use these notifiers to signal various events
and to check if they are allowed, e.g. PRECHANGEMTU and CHANGEMTU
afterwards. Until recently I had to run failure tests by injecting
a custom module, but now this infrastructure makes it trivial to test
these failure paths. Some of the recent bugs I fixed were found using
this module.
Here's an example:
 $ cd /sys/kernel/debug/notifier-error-inject/netdev
 $ echo -22 > actions/NETDEV_CHANGEMTU/error
 $ ip link set eth0 mtu 1024
 RTNETLINK answers: Invalid argument

CC: Akinobu Mita <akinobu.mita@gmail.com>
CC: "David S. Miller" <davem@davemloft.net>
CC: netdev <netdev@vger.kernel.org>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2015-11-28 13:45:28 +01:00 • committed by David S. Miller
parent 27a70af3f4
commit 02fff96a79
4 changed files with 102 additions and 0 deletions
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54
lib/netdev-notifier-error-inject.c Normal file
View file

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#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include "notifier-error-inject.h"
static int priority;
module_param(priority, int, 0);
MODULE_PARM_DESC(priority, "specify netdevice notifier priority");
static struct notifier_err_inject netdev_notifier_err_inject = {
.actions = {
{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_REGISTER) },
{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_CHANGEMTU) },
{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_CHANGENAME) },
{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRE_UP) },
{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRE_TYPE_CHANGE) },
{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_POST_INIT) },
{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRECHANGEMTU) },
{ NOTIFIER_ERR_INJECT_ACTION(NETDEV_PRECHANGEUPPER) },
{}
}
};
static struct dentry *dir;
static int netdev_err_inject_init(void)
{
int err;
dir = notifier_err_inject_init("netdev", notifier_err_inject_dir,
&netdev_notifier_err_inject, priority);
if (IS_ERR(dir))
return PTR_ERR(dir);
err = register_netdevice_notifier(&netdev_notifier_err_inject.nb);
if (err)
debugfs_remove_recursive(dir);
return err;
}
static void netdev_err_inject_exit(void)
{
unregister_netdevice_notifier(&netdev_notifier_err_inject.nb);
debugfs_remove_recursive(dir);
}
module_init(netdev_err_inject_init);
module_exit(netdev_err_inject_exit);
MODULE_DESCRIPTION("Netdevice notifier error injection module");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nikolay Aleksandrov <razor@blackwall.org>");