commit cdc89b97bf23ae3a7869804b6dc13be011ec8f4c
author Johannes Berg <johannes.berg@intel.com> Mon Feb 18 23:54:36 2013 +0100
committer Johannes Berg <johannes.berg@intel.com> Wed Mar 06 16:35:43 2013 +0100
tree 6296fa56d6a553c5c14c893b3681ea2b1359e7b3
parent 3713b4e364effef4b170c97d54528b1cdb16aa6b

nl80211: conditionally add back radar information

If userspace is updated to deal with large split wiphy
information dumps, add back the radar information that
could otherwise push the data over the limit of the
netlink dump messages.

Cc: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f187a92..7701538 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -540,7 +540,8 @@
 }
 
 static int nl80211_msg_put_channel(struct sk_buff *msg,
-				   struct ieee80211_channel *chan)
+				   struct ieee80211_channel *chan,
+				   bool large)
 {
 	if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_FREQ,
 			chan->center_freq))
@@ -555,9 +556,22 @@
 	if ((chan->flags & IEEE80211_CHAN_NO_IBSS) &&
 	    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_IBSS))
 		goto nla_put_failure;
-	if ((chan->flags & IEEE80211_CHAN_RADAR) &&
-	    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_RADAR))
-		goto nla_put_failure;
+	if (chan->flags & IEEE80211_CHAN_RADAR) {
+		if (nla_put_flag(msg, NL80211_FREQUENCY_ATTR_RADAR))
+			goto nla_put_failure;
+		if (large) {
+			u32 time;
+
+			time = elapsed_jiffies_msecs(chan->dfs_state_entered);
+
+			if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_DFS_STATE,
+					chan->dfs_state))
+				goto nla_put_failure;
+			if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_DFS_TIME,
+					time))
+				goto nla_put_failure;
+		}
+	}
 
 	if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
 			DBM_TO_MBM(chan->max_power)))
@@ -833,7 +847,8 @@
 }
 
 static int nl80211_put_iface_combinations(struct wiphy *wiphy,
-					  struct sk_buff *msg)
+					  struct sk_buff *msg,
+					  bool large)
 {
 	struct nlattr *nl_combis;
 	int i, j;
@@ -882,6 +897,10 @@
 		    nla_put_u32(msg, NL80211_IFACE_COMB_MAXNUM,
 				c->max_interfaces))
 			goto nla_put_failure;
+		if (large &&
+		    nla_put_u32(msg, NL80211_IFACE_COMB_RADAR_DETECT_WIDTHS,
+				c->radar_detect_widths))
+			goto nla_put_failure;
 
 		nla_nest_end(msg, nl_combi);
 	}
@@ -1231,7 +1250,8 @@
 
 					chan = &sband->channels[i];
 
-					if (nl80211_msg_put_channel(msg, chan))
+					if (nl80211_msg_put_channel(msg, chan,
+								    split))
 						goto nla_put_failure;
 
 					nla_nest_end(msg, nl_freq);
@@ -1385,7 +1405,7 @@
 					dev->wiphy.software_iftypes))
 			goto nla_put_failure;
 
-		if (nl80211_put_iface_combinations(&dev->wiphy, msg))
+		if (nl80211_put_iface_combinations(&dev->wiphy, msg, split))
 			goto nla_put_failure;
 
 		(*split_start)++;
@@ -9377,7 +9397,7 @@
 	nl_freq = nla_nest_start(msg, NL80211_ATTR_FREQ_BEFORE);
 	if (!nl_freq)
 		goto nla_put_failure;
-	if (nl80211_msg_put_channel(msg, channel_before))
+	if (nl80211_msg_put_channel(msg, channel_before, false))
 		goto nla_put_failure;
 	nla_nest_end(msg, nl_freq);
 
@@ -9385,7 +9405,7 @@
 	nl_freq = nla_nest_start(msg, NL80211_ATTR_FREQ_AFTER);
 	if (!nl_freq)
 		goto nla_put_failure;
-	if (nl80211_msg_put_channel(msg, channel_after))
+	if (nl80211_msg_put_channel(msg, channel_after, false))
 		goto nla_put_failure;
 	nla_nest_end(msg, nl_freq);