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authorSabrina Dubroca <sd@queasysnail.net>2018-04-10 16:28:56 +0200
committerDavid S. Miller <davem@davemloft.net>2018-04-11 14:48:05 -0400
commit83c1f36f9880814b24cdf6c2f91f66f61db65326 (patch)
treef80ca21c633842383f1f9950a821e4ce5bd7d26a /drivers/net
parent9fffc5c6dd7dafb2e021dbbe9a30be2566a6949a (diff)
tun: send netlink notification when the device is modified
I added dumping of link information about tun devices over netlink in commit 1ec010e70593 ("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: 1ec010e70593 ("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>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/tun.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index c9e68fd76a37..28583aa0c17d 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -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)