nl80211: enable IBSS support for channel switch announcements

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index af8d84a..ae61711 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5634,15 +5634,26 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
        static struct nlattr *csa_attrs[NL80211_ATTR_MAX+1];
        u8 radar_detect_width = 0;
        int err;
+       bool need_new_beacon = false;
 
        if (!rdev->ops->channel_switch ||
            !(rdev->wiphy.flags & WIPHY_FLAG_HAS_CHANNEL_SWITCH))
                return -EOPNOTSUPP;
 
-       /* may add IBSS support later */
-       if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
-           dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
+       switch (dev->ieee80211_ptr->iftype) {
+       case NL80211_IFTYPE_AP:
+       case NL80211_IFTYPE_P2P_GO:
+               need_new_beacon = true;
+
+               /* useless if AP is not running */
+               if (!wdev->beacon_interval)
+                       return -EINVAL;
+               break;
+       case NL80211_IFTYPE_ADHOC:
+               break;
+       default:
                return -EOPNOTSUPP;
+       }
 
        memset(&params, 0, sizeof(params));
 
@@ -5651,15 +5662,16 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
                return -EINVAL;
 
        /* only important for AP, IBSS and mesh create IEs internally */
-       if (!info->attrs[NL80211_ATTR_CSA_IES])
-               return -EINVAL;
-
-       /* useless if AP is not running */
-       if (!wdev->beacon_interval)
+       if (need_new_beacon &&
+           (!info->attrs[NL80211_ATTR_CSA_IES] ||
+            !info->attrs[NL80211_ATTR_CSA_C_OFF_BEACON]))
                return -EINVAL;
 
        params.count = nla_get_u32(info->attrs[NL80211_ATTR_CH_SWITCH_COUNT]);
 
+       if (!need_new_beacon)
+               goto skip_beacons;
+
        err = nl80211_parse_beacon(info->attrs, &params.beacon_after);
        if (err)
                return err;
@@ -5699,6 +5711,7 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
                        return -EINVAL;
        }
 
+skip_beacons:
        err = nl80211_parse_chandef(rdev, info, &params.chandef);
        if (err)
                return err;
@@ -5706,12 +5719,17 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
        if (!cfg80211_reg_can_beacon(&rdev->wiphy, &params.chandef))
                return -EINVAL;
 
-       err = cfg80211_chandef_dfs_required(wdev->wiphy, &params.chandef);
-       if (err < 0) {
-               return err;
-       } else if (err) {
-               radar_detect_width = BIT(params.chandef.width);
-               params.radar_required = true;
+       /* DFS channels are only supported for AP/P2P GO ... for now. */
+       if (dev->ieee80211_ptr->iftype == NL80211_IFTYPE_AP ||
+           dev->ieee80211_ptr->iftype == NL80211_IFTYPE_P2P_GO) {
+               err = cfg80211_chandef_dfs_required(wdev->wiphy,
+                                                   &params.chandef);
+               if (err < 0) {
+                       return err;
+               } else if (err) {
+                       radar_detect_width = BIT(params.chandef.width);
+                       params.radar_required = true;
+               }
        }
 
        err = cfg80211_can_use_iftype_chan(rdev, wdev, wdev->iftype,
@@ -10740,7 +10758,8 @@ void cfg80211_ch_switch_notify(struct net_device *dev,
        wdev_lock(wdev);
 
        if (WARN_ON(wdev->iftype != NL80211_IFTYPE_AP &&
-                   wdev->iftype != NL80211_IFTYPE_P2P_GO))
+                   wdev->iftype != NL80211_IFTYPE_P2P_GO &&
+                   wdev->iftype != NL80211_IFTYPE_ADHOC))
                goto out;
 
        wdev->channel = chandef->chan;