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cfg80211: support creating wiphy with suggested name

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Kernel will attempt to use the name if it is supplied,
but if name cannot be used for some reason, the default
phyX name will be used instead.

Signed-off-by: Ben Greear <greearb@candelatech.com>
[while at it, use wiphy_name() instead of dev_name(),
 fix format string issue reported by Kees Cook]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Ben Greear 2014-10-22 12:23:00 -07:00 committed by Johannes Berg
parent 8cdd9e1c37
commit 1998d90ad4
2 changed files with 72 additions and 13 deletions
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23
include/net/cfg80211.h
View file

@ -3184,6 +3184,23 @@ static inline const char *wiphy_name(const struct wiphy *wiphy)
return dev_name(&wiphy->dev);
}
/**
* wiphy_new_nm - create a new wiphy for use with cfg80211
*
* @ops: The configuration operations for this device
* @sizeof_priv: The size of the private area to allocate
* @requested_name: Request a particular name.
* NULL is valid value, and means use the default phy%d naming.
*
* Create a new wiphy and associate the given operations with it.
* @sizeof_priv bytes are allocated for private use.
*
* Return: A pointer to the new wiphy. This pointer must be
* assigned to each netdev's ieee80211_ptr for proper operation.
*/
struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
const char *requested_name);
/**
* wiphy_new - create a new wiphy for use with cfg80211
*
@ -3196,7 +3213,11 @@ static inline const char *wiphy_name(const struct wiphy *wiphy)
* Return: A pointer to the new wiphy. This pointer must be
* assigned to each netdev's ieee80211_ptr for proper operation.
*/
struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv);
static inline struct wiphy *wiphy_new(const struct cfg80211_ops *ops,
int sizeof_priv)
{
return wiphy_new_nm(ops, sizeof_priv, NULL);
}
/**
* wiphy_register - register a wiphy with cfg80211

62
net/wireless/core.c
View file

@ -86,11 +86,11 @@ struct wiphy *wiphy_idx_to_wiphy(int wiphy_idx)
return &rdev->wiphy;
}
int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
char *newname)
static int cfg80211_dev_check_name(struct cfg80211_registered_device *rdev,
const char *newname)
{
struct cfg80211_registered_device *rdev2;
int wiphy_idx, taken = -1, result, digits;
int wiphy_idx, taken = -1, digits;
ASSERT_RTNL();
@ -109,16 +109,29 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
return -EINVAL;
}
/* Ignore nop renames */
if (strcmp(newname, dev_name(&rdev->wiphy.dev)) == 0)
return 0;
/* Ensure another device does not already have this name. */
list_for_each_entry(rdev2, &cfg80211_rdev_list, list)
if (strcmp(newname, dev_name(&rdev2->wiphy.dev)) == 0)
if (strcmp(newname, wiphy_name(&rdev2->wiphy)) == 0)
return -EINVAL;
return 0;
}
int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
char *newname)
{
int result;
ASSERT_RTNL();
/* Ignore nop renames */
if (strcmp(newname, wiphy_name(&rdev->wiphy)) == 0)
return 0;
result = cfg80211_dev_check_name(rdev, newname);
if (result < 0)
return result;
result = device_rename(&rdev->wiphy.dev, newname);
if (result)
return result;
@ -309,7 +322,8 @@ static void cfg80211_destroy_iface_wk(struct work_struct *work)
/* exported functions */
struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv,
const char *requested_name)
{
static atomic_t wiphy_counter = ATOMIC_INIT(0);
@ -346,7 +360,31 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
rdev->wiphy_idx--;
/* give it a proper name */
dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
if (requested_name && requested_name[0]) {
int rv;
rtnl_lock();
rv = cfg80211_dev_check_name(rdev, requested_name);
if (rv < 0) {
rtnl_unlock();
goto use_default_name;
}
rv = dev_set_name(&rdev->wiphy.dev, "%s", requested_name);
rtnl_unlock();
if (rv)
goto use_default_name;
} else {
use_default_name:
/* NOTE: This is *probably* safe w/out holding rtnl because of
* the restrictions on phy names. Probably this call could
* fail if some other part of the kernel (re)named a device
* phyX. But, might should add some locking and check return
* value, and use a different name if this one exists?
*/
dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx);
}
INIT_LIST_HEAD(&rdev->wdev_list);
INIT_LIST_HEAD(&rdev->beacon_registrations);
@ -406,7 +444,7 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
return &rdev->wiphy;
}
EXPORT_SYMBOL(wiphy_new);
EXPORT_SYMBOL(wiphy_new_nm);
static int wiphy_verify_combinations(struct wiphy *wiphy)
{