unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

nl80211: refactor common code in scan flags checks

Browse source 
There's a very common pattern to check for a scan flag and
then reject it if an extended feature flag isn't set, factor
this out into a helper function.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
This commit is contained in:
Johannes Berg 2018-05-28 15:47:37 +02:00 committed by Johannes Berg
parent 1d211d4316
commit db0a4ad80d
1 changed files with 31 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

60
net/wireless/nl80211.c
View file

@ -6861,6 +6861,16 @@ static bool cfg80211_off_channel_oper_allowed(struct wireless_dev *wdev)
return regulatory_pre_cac_allowed(wdev->wiphy);
}
static bool nl80211_check_scan_feat(struct wiphy *wiphy, u32 flags, u32 flag,
enum nl80211_ext_feature_index feat)
{
if (!(flags & flag))
return true;
if (wiphy_ext_feature_isset(wiphy, feat))
return true;
return false;
}
static int
nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
void *request, struct nlattr **attrs,
@ -6895,15 +6905,27 @@ nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
if (((*flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
!(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) ||
((*flags & NL80211_SCAN_FLAG_LOW_SPAN) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_LOW_SPAN_SCAN)) ||
((*flags & NL80211_SCAN_FLAG_LOW_POWER) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_LOW_POWER_SCAN)) ||
((*flags & NL80211_SCAN_FLAG_HIGH_ACCURACY) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_HIGH_ACCURACY_SCAN)))
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_LOW_SPAN,
NL80211_EXT_FEATURE_LOW_SPAN_SCAN) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_LOW_POWER,
NL80211_EXT_FEATURE_LOW_POWER_SCAN) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_HIGH_ACCURACY,
NL80211_EXT_FEATURE_HIGH_ACCURACY_SCAN) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_FILS_MAX_CHANNEL_TIME,
NL80211_EXT_FEATURE_FILS_MAX_CHANNEL_TIME) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP,
NL80211_EXT_FEATURE_ACCEPT_BCAST_PROBE_RESP) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION,
NL80211_EXT_FEATURE_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION) ||
!nl80211_check_scan_feat(wiphy, *flags,
NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE,
NL80211_EXT_FEATURE_OCE_PROBE_REQ_HIGH_TX_RATE))
return -EOPNOTSUPP;
if (*flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
@ -6918,26 +6940,6 @@ nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
return err;
}
if ((*flags & NL80211_SCAN_FLAG_FILS_MAX_CHANNEL_TIME) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_FILS_MAX_CHANNEL_TIME))
return -EOPNOTSUPP;
if ((*flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_ACCEPT_BCAST_PROBE_RESP))
return -EOPNOTSUPP;
if ((*flags & NL80211_SCAN_FLAG_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION))
return -EOPNOTSUPP;
if ((*flags & NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_OCE_PROBE_REQ_HIGH_TX_RATE))
return -EOPNOTSUPP;
return 0;
}