Merge branch 'net-devname_alloc_cleanups'
Rasmus Villemoes says: ==================== net: core: devname allocation cleanups It's somewhat confusing to have both dev_alloc_name and dev_get_valid_name. I can't see why the former is less strict than the latter, so make them (or rather dev_alloc_name_ns and dev_get_valid_name) equivalent, hardening dev_alloc_name() a little. Obvious follow-up patches would be to only export one function, and make dev_alloc_name a static inline wrapper for that (whichever name is chosen for the exported interface). But maybe there is a good reason the two exported interfaces do different checking, so I'll refrain from including the trivial but tree-wide renaming in this series. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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f6b3716dcd
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@ -1064,7 +1064,10 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
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unsigned long *inuse;
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unsigned long *inuse;
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struct net_device *d;
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struct net_device *d;
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p = strnchr(name, IFNAMSIZ-1, '%');
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if (!dev_valid_name(name))
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return -EINVAL;
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p = strchr(name, '%');
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if (p) {
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if (p) {
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/*
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/*
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* Verify the string as this thing may have come from
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* Verify the string as this thing may have come from
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@ -1095,8 +1098,7 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
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free_page((unsigned long) inuse);
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free_page((unsigned long) inuse);
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}
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}
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if (buf != name)
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snprintf(buf, IFNAMSIZ, name, i);
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snprintf(buf, IFNAMSIZ, name, i);
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if (!__dev_get_by_name(net, buf))
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if (!__dev_get_by_name(net, buf))
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return i;
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return i;
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@ -1104,7 +1106,21 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
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* when the name is long and there isn't enough space left
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* when the name is long and there isn't enough space left
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* for the digits, or if all bits are used.
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* for the digits, or if all bits are used.
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*/
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*/
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return -ENFILE;
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return p ? -ENFILE : -EEXIST;
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}
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static int dev_alloc_name_ns(struct net *net,
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struct net_device *dev,
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const char *name)
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{
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char buf[IFNAMSIZ];
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int ret;
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BUG_ON(!net);
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ret = __dev_alloc_name(net, name, buf);
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if (ret >= 0)
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strlcpy(dev->name, buf, IFNAMSIZ);
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return ret;
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}
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}
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/**
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/**
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@ -1123,48 +1139,14 @@ static int __dev_alloc_name(struct net *net, const char *name, char *buf)
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int dev_alloc_name(struct net_device *dev, const char *name)
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int dev_alloc_name(struct net_device *dev, const char *name)
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{
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{
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char buf[IFNAMSIZ];
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return dev_alloc_name_ns(dev_net(dev), dev, name);
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struct net *net;
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int ret;
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BUG_ON(!dev_net(dev));
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net = dev_net(dev);
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ret = __dev_alloc_name(net, name, buf);
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if (ret >= 0)
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strlcpy(dev->name, buf, IFNAMSIZ);
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return ret;
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}
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}
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EXPORT_SYMBOL(dev_alloc_name);
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EXPORT_SYMBOL(dev_alloc_name);
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static int dev_alloc_name_ns(struct net *net,
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struct net_device *dev,
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const char *name)
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{
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char buf[IFNAMSIZ];
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int ret;
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ret = __dev_alloc_name(net, name, buf);
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if (ret >= 0)
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strlcpy(dev->name, buf, IFNAMSIZ);
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return ret;
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}
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int dev_get_valid_name(struct net *net, struct net_device *dev,
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int dev_get_valid_name(struct net *net, struct net_device *dev,
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const char *name)
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const char *name)
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{
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{
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BUG_ON(!net);
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return dev_alloc_name_ns(net, dev, name);
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if (!dev_valid_name(name))
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return -EINVAL;
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if (strchr(name, '%'))
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return dev_alloc_name_ns(net, dev, name);
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else if (__dev_get_by_name(net, name))
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return -EEXIST;
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else if (dev->name != name)
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strlcpy(dev->name, name, IFNAMSIZ);
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return 0;
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}
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}
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EXPORT_SYMBOL(dev_get_valid_name);
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EXPORT_SYMBOL(dev_get_valid_name);
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