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ipv4: consolidate the VIFF_TUNNEL handling in ipmr_new_tunnel

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Also move the dev_set_allmulti call and the error handling into the
ioctl helper.  This allows reusing already looked up tunnel_dev pointer
and the set up argument structure for the deletion in the error handler.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-19 15:03:12 +02:00 committed by David S. Miller
parent c384b8a70c
commit c1fd1182c4
1 changed files with 13 additions and 40 deletions
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53
net/ipv4/ipmr.c
View file

@ -421,37 +421,6 @@ static void ipmr_free_table(struct mr_table *mrt)
/* Service routines creating virtual interfaces: DVMRP tunnels and PIMREG */
static void ipmr_del_tunnel(struct net_device *dev, struct vifctl *v)
{
struct net *net = dev_net(dev);
dev_close(dev);
dev = __dev_get_by_name(net, "tunl0");
if (dev) {
const struct net_device_ops *ops = dev->netdev_ops;
struct ifreq ifr;
struct ip_tunnel_parm p;
memset(&p, 0, sizeof(p));
p.iph.daddr = v->vifc_rmt_addr.s_addr;
p.iph.saddr = v->vifc_lcl_addr.s_addr;
p.iph.version = 4;
p.iph.ihl = 5;
p.iph.protocol = IPPROTO_IPIP;
sprintf(p.name, "dvmrp%d", v->vifc_vifi);
ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
if (ops->ndo_do_ioctl) {
mm_segment_t oldfs = get_fs();
set_fs(KERNEL_DS);
ops->ndo_do_ioctl(dev, &ifr, SIOCDELTUNNEL);
set_fs(oldfs);
}
}
}
/* Initialize ipmr pimreg/tunnel in_device */
static bool ipmr_init_vif_indev(const struct net_device *dev)
{
@ -509,12 +478,22 @@ static struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
if (dev_open(new_dev, NULL))
goto out_unregister;
dev_hold(new_dev);
err = dev_set_allmulti(new_dev, 1);
if (err) {
dev_close(new_dev);
set_fs(KERNEL_DS);
tunnel_dev->netdev_ops->ndo_do_ioctl(tunnel_dev, &ifr,
SIOCDELTUNNEL);
set_fs(oldfs);
dev_put(new_dev);
new_dev = ERR_PTR(err);
}
return new_dev;
out_unregister:
unregister_netdevice(new_dev);
out:
return NULL;
return ERR_PTR(-ENOBUFS);
}
#if defined(CONFIG_IP_PIMSM_V1) || defined(CONFIG_IP_PIMSM_V2)
@ -866,14 +845,8 @@ static int vif_add(struct net *net, struct mr_table *mrt,
break;
case VIFF_TUNNEL:
dev = ipmr_new_tunnel(net, vifc);
if (!dev)
return -ENOBUFS;
err = dev_set_allmulti(dev, 1);
if (err) {
ipmr_del_tunnel(dev, vifc);
dev_put(dev);
return err;
}
if (IS_ERR(dev))
return PTR_ERR(dev);
break;
case VIFF_USE_IFINDEX:
case 0: