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cfg80211: Add a function to iterate all BSS entries

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Add a function that iterates over the BSS entries associated with a
given wiphy and calls a callback for each iterated BSS. This can be
used by drivers in various ways, e.g., to evaluate some property for
all the BSSs in the medium.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Ilan Peer 2019-05-29 15:25:32 +03:00 committed by Johannes Berg
parent a0de1ca383
commit 4770c8f902
2 changed files with 41 additions and 0 deletions
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20
include/net/cfg80211.h
View file

@ -5750,6 +5750,26 @@ void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
*/
void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *bss);
/**
* cfg80211_bss_iter - iterate all BSS entries
*
* This function iterates over the BSS entries associated with the given wiphy
* and calls the callback for the iterated BSS. The iterator function is not
* allowed to call functions that might modify the internal state of the BSS DB.
*
* @wiphy: the wiphy
* @chandef: if given, the iterator function will be called only if the channel
* of the currently iterated BSS is a subset of the given channel.
* @iter: the iterator function to call
* @iter_data: an argument to the iterator function
*/
void cfg80211_bss_iter(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
void (*iter)(struct wiphy *wiphy,
struct cfg80211_bss *bss,
void *data),
void *iter_data);
static inline enum nl80211_bss_scan_width
cfg80211_chandef_to_scan_width(const struct cfg80211_chan_def *chandef)
{

21
net/wireless/scan.c
View file

@ -1974,6 +1974,27 @@ void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
}
EXPORT_SYMBOL(cfg80211_unlink_bss);
void cfg80211_bss_iter(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
void (*iter)(struct wiphy *wiphy,
struct cfg80211_bss *bss,
void *data),
void *iter_data)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
struct cfg80211_internal_bss *bss;
spin_lock_bh(&rdev->bss_lock);
list_for_each_entry(bss, &rdev->bss_list, list) {
if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
iter(wiphy, &bss->pub, iter_data);
}
spin_unlock_bh(&rdev->bss_lock);
}
EXPORT_SYMBOL(cfg80211_bss_iter);
#ifdef CONFIG_CFG80211_WEXT
static struct cfg80211_registered_device *
cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)