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net: device name allocation cleanups 

Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Octavian Purdila 2009-11-18 02:36:59 +00:00 committed by David S. Miller
parent 7adcdb4c11
commit d90310243f
1 changed files with 24 additions and 45 deletions
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69
net/core/dev.c
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@ -893,7 +893,8 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
free_page((unsigned long) inuse);
}
snprintf(buf, IFNAMSIZ, name, i);
if (buf != name)
snprintf(buf, IFNAMSIZ, name, i);
if (!__dev_get_by_name(net, buf))
return i;
@ -933,6 +934,21 @@ int dev_alloc_name(struct net_device *dev, const char *name)
}
EXPORT_SYMBOL(dev_alloc_name);
static int dev_get_valid_name(struct net *net, const char *name, char *buf,
bool fmt)
{
if (!dev_valid_name(name))
return -EINVAL;
if (fmt && strchr(name, '%'))
return __dev_alloc_name(net, name, buf);
else if (__dev_get_by_name(net, name))
return -EEXIST;
else if (buf != name)
strlcpy(buf, name, IFNAMSIZ);
return 0;
}
/**
* dev_change_name - change name of a device
@ -956,22 +972,14 @@ int dev_change_name(struct net_device *dev, const char *newname)
if (dev->flags & IFF_UP)
return -EBUSY;
if (!dev_valid_name(newname))
return -EINVAL;
if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
return 0;
memcpy(oldname, dev->name, IFNAMSIZ);
if (strchr(newname, '%')) {
err = dev_alloc_name(dev, newname);
if (err < 0)
return err;
} else if (__dev_get_by_name(net, newname))
return -EEXIST;
else
strlcpy(dev->name, newname, IFNAMSIZ);
err = dev_get_valid_name(net, newname, dev->name, 1);
if (err < 0)
return err;
rollback:
/* For now only devices in the initial network namespace
@ -4883,8 +4891,6 @@ EXPORT_SYMBOL(netdev_fix_features);
int register_netdevice(struct net_device *dev)
{
struct hlist_head *head;
struct hlist_node *p;
int ret;
struct net *net = dev_net(dev);
@ -4913,26 +4919,14 @@ int register_netdevice(struct net_device *dev)
}
}
if (!dev_valid_name(dev->name)) {
ret = -EINVAL;
ret = dev_get_valid_name(net, dev->name, dev->name, 0);
if (ret)
goto err_uninit;
}
dev->ifindex = dev_new_index(net);
if (dev->iflink == -1)
dev->iflink = dev->ifindex;
/* Check for existence of name */
head = dev_name_hash(net, dev->name);
hlist_for_each(p, head) {
struct net_device *d
= hlist_entry(p, struct net_device, name_hlist);
if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
ret = -EEXIST;
goto err_uninit;
}
}
/* Fix illegal checksum combinations */
if ((dev->features & NETIF_F_HW_CSUM) &&
(dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
@ -5460,8 +5454,6 @@ EXPORT_SYMBOL(unregister_netdev);
int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
{
char buf[IFNAMSIZ];
const char *destname;
int err;
ASSERT_RTNL();
@ -5494,20 +5486,11 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
* we can use it in the destination network namespace.
*/
err = -EEXIST;
destname = dev->name;
if (__dev_get_by_name(net, destname)) {
if (__dev_get_by_name(net, dev->name)) {
/* We get here if we can't use the current device name */
if (!pat)
goto out;
if (!dev_valid_name(pat))
goto out;
if (strchr(pat, '%')) {
if (__dev_alloc_name(net, pat, buf) < 0)
goto out;
destname = buf;
} else
destname = pat;
if (__dev_get_by_name(net, destname))
if (dev_get_valid_name(net, pat, dev->name, 1))
goto out;
}
@ -5544,10 +5527,6 @@ int dev_change_net_namespace(struct net_device *dev, struct net *net, const char
/* Actually switch the network namespace */
dev_net_set(dev, net);
/* Assign the new device name */
if (destname != dev->name)
strcpy(dev->name, destname);
/* If there is an ifindex conflict assign a new one */
if (__dev_get_by_index(net, dev->ifindex)) {
int iflink = (dev->iflink == dev->ifindex);