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ip_tunnel: return more precise errno value when adding tunnel fails 

Currently this always returns ENOBUFS, because the return value of
__ip_tunnel_create is discarded.

A more common failure is a duplicate name (EEXIST).  Propagate the real
error code so userspace can display a more meaningful error message.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal 2014-02-14 13:14:39 +01:00 committed by David S. Miller
parent df9d9fdf8f
commit 6dd3c9ec23
1 changed files with 10 additions and 5 deletions
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15
net/ipv4/ip_tunnel.c
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@ -443,7 +443,7 @@ static struct ip_tunnel *ip_tunnel_create(struct net *net,
fbt = netdev_priv(itn->fb_tunnel_dev);
dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
if (IS_ERR(dev))
return NULL;
return ERR_CAST(dev);
dev->mtu = ip_tunnel_bind_dev(dev);
@ -796,9 +796,13 @@ int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
if (!t && (cmd == SIOCADDTUNNEL))
if (!t && (cmd == SIOCADDTUNNEL)) {
t = ip_tunnel_create(net, itn, p);
if (IS_ERR(t)) {
err = PTR_ERR(t);
break;
}
}
if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
if (t != NULL) {
if (t->dev != dev) {
@ -825,8 +829,9 @@ int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
if (t) {
err = 0;
ip_tunnel_update(itn, t, dev, p, true);
} else
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
} else {
err = -ENOENT;
}
break;
case SIOCDELTUNNEL: