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tun: send netlink notification when the device is modified 

I added dumping of link information about tun devices over netlink in
commit 1ec010e705 ("tun: export flags, uid, gid, queue information
over netlink"), but didn't add the missing netlink notifications when
the device's exported properties change.

This patch adds notifications when owner/group or flags are modified,
when queues are attached/detached, and when a tun fd is closed.

Reported-by: Thomas Haller <thaller@redhat.com>
Fixes: 1ec010e705 ("tun: export flags, uid, gid, queue information over netlink")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sabrina Dubroca 2018-04-10 16:28:56 +02:00 committed by David S. Miller
parent 9fffc5c6dd
commit 83c1f36f98
1 changed files with 22 additions and 2 deletions
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24
drivers/net/tun.c
View File

@ -743,8 +743,15 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
static void tun_detach(struct tun_file *tfile, bool clean)
{
struct tun_struct *tun;
struct net_device *dev;
rtnl_lock();
tun = rtnl_dereference(tfile->tun);
dev = tun ? tun->dev : NULL;
__tun_detach(tfile, clean);
if (dev)
netdev_state_change(dev);
rtnl_unlock();
}
@ -2562,13 +2569,15 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
/* One or more queue has already been attached, no need
* to initialize the device again.
*/
netdev_state_change(dev);
return 0;
}
tun->flags = (tun->flags & ~TUN_FEATURES) |
(ifr->ifr_flags & TUN_FEATURES);
}
else {
netdev_state_change(dev);
} else {
char *name;
unsigned long flags = 0;
int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ?
@ -2808,6 +2817,9 @@ static int tun_set_queue(struct file *file, struct ifreq *ifr)
} else
ret = -EINVAL;
if (ret >= 0)
netdev_state_change(tun->dev);
unlock:
rtnl_unlock();
return ret;
@ -2848,6 +2860,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
unsigned int ifindex;
int le;
int ret;
bool do_notify = false;
if (cmd == TUNSETIFF || cmd == TUNSETQUEUE ||
(_IOC_TYPE(cmd) == SOCK_IOC_TYPE && cmd != SIOCGSKNS)) {
@ -2944,10 +2957,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
if (arg && !(tun->flags & IFF_PERSIST)) {
tun->flags |= IFF_PERSIST;
__module_get(THIS_MODULE);
do_notify = true;
}
if (!arg && (tun->flags & IFF_PERSIST)) {
tun->flags &= ~IFF_PERSIST;
module_put(THIS_MODULE);
do_notify = true;
}
tun_debug(KERN_INFO, tun, "persist %s\n",
@ -2962,6 +2977,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
break;
}
tun->owner = owner;
do_notify = true;
tun_debug(KERN_INFO, tun, "owner set to %u\n",
from_kuid(&init_user_ns, tun->owner));
break;
@ -2974,6 +2990,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
break;
}
tun->group = group;
do_notify = true;
tun_debug(KERN_INFO, tun, "group set to %u\n",
from_kgid(&init_user_ns, tun->group));
break;
@ -3133,6 +3150,9 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
break;
}
if (do_notify)
netdev_state_change(tun->dev);
unlock:
rtnl_unlock();
if (tun)