After going throught the Channel Availability Check (CAC)
required by DFS enable beaconing. Channels that have
gone through a CAC will be in the NL80211_DFS_AVAILABLE
state. Without this change APs don't start beaconing
after a successful CAC.
Signed-off-by: Janusz Dziedzic <janusz.dziedzic@xxxxxxxxx>
---
net/wireless/chan.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 73 insertions(+), 5 deletions(-)
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 6f2be48..a7168d5 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -426,6 +426,71 @@ bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
}
+static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 bandwidth)
+{
+ struct ieee80211_channel *c;
+ u32 freq, start_freq, end_freq;
+
+ start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+ end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
+
+ /* Check entire range of channels for the bandwidth.
+ * If any channel in between is disabled or has not
+ * had gone through CAC return false
+ */
+ for (freq = start_freq; freq <= end_freq; freq += 20) {
+ c = ieee80211_get_channel(wiphy, freq);
+ if (!c)
+ return false;
+
+ if (c->flags & IEEE80211_CHAN_DISABLED)
+ return false;
+
+ if ((c->flags & IEEE80211_CHAN_RADAR) &&
+ (c->dfs_state != NL80211_DFS_AVAILABLE))
+ return false;
+ }
+
+ return true;
+}
+
+static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef)
+{
+ int width;
+ int r;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return false;
+
+ width = cfg80211_chandef_get_width(chandef);
+ if (width < 0)
+ return false;
+
+ r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
+ width);
+
+ /* If any of channels unavailable for cf1 just return */
+ if (!r)
+ return r;
+
+ switch (chandef->width) {
+ case NL80211_CHAN_WIDTH_80P80:
+ WARN_ON(!chandef->center_freq2);
+ r = cfg80211_get_chans_dfs_available(wiphy,
+ chandef->center_freq2,
+ width);
+ default:
+ WARN_ON(chandef->center_freq2);
+ break;
+ }
+
+ return r;
+}
+
+
static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
u32 center_freq, u32 bandwidth,
u32 prohibited_flags)
@@ -547,11 +612,14 @@ bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
trace_cfg80211_reg_can_beacon(wiphy, chandef);
- res = cfg80211_chandef_usable(wiphy, chandef,
- IEEE80211_CHAN_DISABLED |
- IEEE80211_CHAN_PASSIVE_SCAN |
- IEEE80211_CHAN_NO_IBSS |
- IEEE80211_CHAN_RADAR);
+ if (cfg80211_chandef_dfs_required(wiphy, chandef) > 0)
+ res = cfg80211_chandef_dfs_available(wiphy, chandef);
+ else
+ res = cfg80211_chandef_usable(wiphy, chandef,
+ IEEE80211_CHAN_DISABLED |
+ IEEE80211_CHAN_PASSIVE_SCAN |
+ IEEE80211_CHAN_NO_IBSS |
+ IEEE80211_CHAN_RADAR);
trace_cfg80211_return_bool(res);
return res;
--
1.7.9.5
--
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