diff options
author | Octavian Purdila <opurdila@ixiacom.com> | 2009-11-18 02:36:59 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2009-11-18 05:03:35 -0800 |
commit | d90310243fd750240755e217c5faa13e24f41536 (patch) | |
tree | 05496a71a478bd5b273dd425c275f781e3bd1b58 /net/core/dev.c | |
parent | 7adcdb4c1142dc446ab9d4c51ab09cc87e0749c9 (diff) |
net: device name allocation cleanups
Signed-off-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r-- | net/core/dev.c | 69 |
1 files changed, 24 insertions, 45 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index c128af708eb..9977288583b 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -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); |