From cdc89b97bf23ae3a7869804b6dc13be011ec8f4c Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 18 Feb 2013 23:54:36 +0100 Subject: [PATCH] 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 Signed-off-by: Johannes Berg --- net/wireless/nl80211.c | 38 +++++++++++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 9 deletions(-) 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 inline void *nl80211hdr_put(struct sk_buff *skb, u32 portid, u32 seq, } 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 @@ static int nl80211_msg_put_channel(struct sk_buff *msg, 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 @@ nla_put_failure: } 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 @@ static int nl80211_put_iface_combinations(struct wiphy *wiphy, 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 @@ static int nl80211_send_wiphy(struct cfg80211_registered_device *dev, 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 @@ static int nl80211_send_wiphy(struct cfg80211_registered_device *dev, 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 @@ void nl80211_send_beacon_hint_event(struct wiphy *wiphy, 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 @@ void nl80211_send_beacon_hint_event(struct wiphy *wiphy, 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); -- 2.7.4