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Commit 6dd3c9ec authored by Florian Westphal's avatar Florian Westphal Committed by David S. Miller
Browse files

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: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent df9d9fdf

net/ipv4/ip_tunnel.c

+10 −5
Original line number Diff line number Diff line
@@ -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: