cfg80211: check radar interface combinations
To ease further DFS development regarding interface combinations, use
the interface combinations structure to test for radar capabilities.
Drivers can specify which channel widths they support, and in which
modes. Right now only a single AP interface is allowed, but as the
DFS code evolves other combinations can be enabled.
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 747dd93..0e702cd 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -382,8 +382,11 @@
c = &wiphy->iface_combinations[i];
- /* Combinations with just one interface aren't real */
- if (WARN_ON(c->max_interfaces < 2))
+ /*
+ * Combinations with just one interface aren't real,
+ * however we make an exception for DFS.
+ */
+ if (WARN_ON((c->max_interfaces < 2) && !c->radar_detect_widths))
return -EINVAL;
/* Need at least one channel */
@@ -398,6 +401,11 @@
CFG80211_MAX_NUM_DIFFERENT_CHANNELS))
return -EINVAL;
+ /* DFS only works on one channel. */
+ if (WARN_ON(c->radar_detect_widths &&
+ (c->num_different_channels > 1)))
+ return -EINVAL;
+
if (WARN_ON(!c->n_limits))
return -EINVAL;