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appletalk: factor out a atrtr_ioctl_addrt helper 

Add a helper than can be shared with the upcoming compat ioctl 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 2020-05-18 08:28:07 +02:00 committed by David S. Miller
parent 3986912f6a
commit a500492354
1 changed files with 20 additions and 13 deletions
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33
net/appletalk/ddp.c
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@ -867,6 +867,24 @@ static int atif_ioctl(int cmd, void __user *arg)
return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
}
static int atrtr_ioctl_addrt(struct rtentry *rt)
{
struct net_device *dev = NULL;
if (rt->rt_dev) {
char name[IFNAMSIZ];
if (copy_from_user(name, rt->rt_dev, IFNAMSIZ-1))
return -EFAULT;
name[IFNAMSIZ-1] = '\0';
dev = __dev_get_by_name(&init_net, name);
if (!dev)
return -ENODEV;
}
return atrtr_create(rt, dev);
}
/* Routing ioctl() calls */
static int atrtr_ioctl(unsigned int cmd, void __user *arg)
{
@ -882,19 +900,8 @@ static int atrtr_ioctl(unsigned int cmd, void __user *arg)
return atrtr_delete(&((struct sockaddr_at *)
&rt.rt_dst)->sat_addr);
case SIOCADDRT: {
struct net_device *dev = NULL;
if (rt.rt_dev) {
char name[IFNAMSIZ];
if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
return -EFAULT;
name[IFNAMSIZ-1] = '\0';
dev = __dev_get_by_name(&init_net, name);
if (!dev)
return -ENODEV;
}
return atrtr_create(&rt, dev);
}
case SIOCADDRT:
return atrtr_ioctl_addrt(&rt);
}
return -EINVAL;
}