When nominal bandwidth falls completely or partly
within the band 5600MHz to 5650MHz the CAC time shall
be 10 minutes.
This is ETSI requirement. FCC forbids weather channels usage.
Signed-off-by: Janusz Dziedzic <janusz.dziedzic@xxxxxxxxx>
---
include/net/cfg80211.h | 5 ++-
net/wireless/chan.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++
net/wireless/core.h | 4 +++
net/wireless/nl80211.c | 6 +++-
4 files changed, 92 insertions(+), 2 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index d43fa0a..c40847e 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -125,9 +125,12 @@ enum ieee80211_channel_flags {
#define IEEE80211_CHAN_NO_HT40 \
(IEEE80211_CHAN_NO_HT40PLUS | IEEE80211_CHAN_NO_HT40MINUS)
-#define IEEE80211_DFS_MIN_CAC_TIME_MS 60000
+#define IEEE80211_DFS_MIN_CAC_TIME_MS (60 * 1000)
#define IEEE80211_DFS_MIN_NOP_TIME_MS (30 * 60 * 1000)
+/* ETSI EN 301 893 V1.7.0 - Table D.1 */
+#define IEEE80211_DFS_WEATHER_MIN_CAC_TIME_MS (10 * 60 * 1000)
+
/**
* struct ieee80211_channel - channel definition
*
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 78559b5..057edde 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -490,6 +490,85 @@ static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
return r;
}
+static int cfg80211_get_chans_dfs_is_weather(struct wiphy *wiphy,
+ u32 center_freq,
+ u32 bandwidth)
+{
+ u32 start_freq, end_freq;
+
+ start_freq = cfg80211_get_start_freq(center_freq, bandwidth) - 10;
+ end_freq = cfg80211_get_end_freq(center_freq, bandwidth) + 10;
+
+ /*
+ * ETSI EN 301 893 V1.7.0 Table D.1
+ * TODO In the future we can get this from regdb eg. channel flag
+ * IEEE80211_CHAN_TDWR.
+ */
+ if ((start_freq >= 5600 && start_freq < 5650) ||
+ (end_freq > 5600 && end_freq <= 5650))
+ return 1;
+
+ return 0;
+}
+
+static int
+cfg80211_chandef_dfs_is_weather(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef)
+{
+ int width;
+ int r;
+
+ if (WARN_ON(!cfg80211_chandef_valid(chandef)))
+ return -EINVAL;
+
+ width = cfg80211_chandef_get_width(chandef);
+ if (width < 0)
+ return -EINVAL;
+
+ r = cfg80211_get_chans_dfs_is_weather(wiphy,
+ chandef->center_freq1,
+ width);
+
+ if (r)
+ return r;
+
+ switch (chandef->width) {
+ case NL80211_CHAN_WIDTH_80P80:
+ WARN_ON(!chandef->center_freq2);
+ r = cfg80211_get_chans_dfs_is_weather(wiphy,
+ chandef->center_freq2,
+ width);
+ default:
+ WARN_ON(chandef->center_freq2);
+ break;
+ }
+
+ return r;
+}
+
+unsigned int
+cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef,
+ enum nl80211_dfs_regions dfs_region)
+{
+ unsigned int timeout_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
+
+ switch (dfs_region) {
+ case NL80211_DFS_ETSI:
+ if (cfg80211_chandef_dfs_is_weather(wiphy, chandef))
+ timeout_ms = IEEE80211_DFS_WEATHER_MIN_CAC_TIME_MS;
+ break;
+ /* TODO check JP CAC time */
+ case NL80211_DFS_JP:
+ break;
+ /* FCC don't allow weather channels */
+ case NL80211_DFS_FCC:
+ default:
+ break;
+ }
+
+ return timeout_ms;
+}
static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
u32 center_freq, u32 bandwidth,
diff --git a/net/wireless/core.h b/net/wireless/core.h
index 5390aeb..f497ea1 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -401,6 +401,10 @@ void cfg80211_set_dfs_state(struct wiphy *wiphy,
void cfg80211_dfs_channels_update_work(struct work_struct *work);
+unsigned int
+cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
+ const struct cfg80211_chan_def *chandef,
+ enum nl80211_dfs_regions dfs_region);
static inline int
cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 59d7522..313502d 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5632,6 +5632,7 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_chan_def chandef;
enum nl80211_dfs_regions dfs_region;
+ unsigned int cac_time_ms;
int err;
dfs_region = reg_get_dfs_region(wdev->wiphy);
@@ -5667,8 +5668,11 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
if (err)
return err;
+ cac_time_ms = cfg80211_chandef_dfs_cac_time(&rdev->wiphy, &chandef,
+ dfs_region);
+
err = rdev->ops->start_radar_detection(&rdev->wiphy, dev, &chandef,
- IEEE80211_DFS_MIN_CAC_TIME_MS);
+ cac_time_ms);
if (!err) {
wdev->channel = chandef.chan;
wdev->cac_started = true;
--
1.7.9.5
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