cfg80211/mac80211: better channel handling
authorJohannes Berg <johannes@sipsolutions.net>
Wed, 5 May 2010 13:25:02 +0000 (15:25 +0200)
committerJohn W. Linville <linville@tuxdriver.com>
Fri, 7 May 2010 18:55:50 +0000 (14:55 -0400)
Currently (all tested with hwsim) you can do stupid
things like setting up an AP on a certain channel,
then adding another virtual interface and making
that associate on another channel -- this will make
the beaconing to move channel but obviously without
the necessary IEs data update.

In order to improve this situation, first make the
configuration APIs (cfg80211 and nl80211) aware of
multi-channel operation -- we'll eventually need
that in the future anyway. There's one userland API
change and one API addition. The API change is that
now SET_WIPHY must be called with virtual interface
index rather than only wiphy index in order to take
effect for that interface -- luckily all current
users (hostapd) do that. For monitor interfaces, the
old setting is preserved, but monitors are always
slaved to other devices anyway so no guarantees.

The second userland API change is the introduction
of a per virtual interface SET_CHANNEL command, that
hostapd should use going forward to make it easier
to understand what's going on (it can automatically
detect a kernel with this command).

Other than mac80211, no existing cfg80211 drivers
are affected by this change because they only allow
a single virtual interface.

mac80211, however, now needs to be aware that the
channel settings are per interface now, and needs
to disallow (for now) real multi-channel operation,
which is another important part of this patch.

One of the immediate benefits is that you can now
start hostapd to operate on a hardware that already
has a connection on another virtual interface, as
long as you specify the same channel.

Note that two things are left unhandled (this is an
improvement -- not a complete fix):

 * different HT/no-HT modes

   currently you could start an HT AP and then
   connect to a non-HT network on the same channel
   which would configure the hardware for no HT;
   that can be fixed fairly easily

 * CSA

   An AP we're connected to on a virtual interface
   might indicate switching channels, and in that
   case we would follow it, regardless of how many
   other interfaces are operating; this requires
   more effort to fix but is pretty rare after all

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
16 files changed:
drivers/net/wireless/libertas/cfg.c
drivers/net/wireless/orinoco/cfg.c
drivers/net/wireless/rndis_wlan.c
include/linux/nl80211.h
include/net/cfg80211.h
net/mac80211/Makefile
net/mac80211/cfg.c
net/mac80211/chan.c [new file with mode: 0644]
net/mac80211/ieee80211_i.h
net/wireless/chan.c
net/wireless/core.h
net/wireless/ibss.c
net/wireless/nl80211.c
net/wireless/sme.c
net/wireless/wext-compat.c
net/wireless/wext-sme.c

index 82ebe1461a77c99721837729c33ddb59e1a56eb7..ea9d0b2ea0d77c4c279b2e95b9a21efe8d7dd311 100644 (file)
@@ -78,6 +78,7 @@ static const u32 cipher_suites[] = {
 
 
 static int lbs_cfg_set_channel(struct wiphy *wiphy,
+       struct net_device *netdev,
        struct ieee80211_channel *chan,
        enum nl80211_channel_type channel_type)
 {
index 81d228de9e5dc855a26e8f582123c8ea1624bc3f..8c4169c227ae8786bdf9429012594b6521cbdbb4 100644 (file)
@@ -159,6 +159,7 @@ static int orinoco_scan(struct wiphy *wiphy, struct net_device *dev,
 }
 
 static int orinoco_set_channel(struct wiphy *wiphy,
+                       struct net_device *netdev,
                        struct ieee80211_channel *chan,
                        enum nl80211_channel_type channel_type)
 {
index aceb95ef7274e348ee542fead3cfd29664782fa3..99d4f0de77ca1888c789fe7b498a57607edb8b2f 100644 (file)
@@ -534,7 +534,7 @@ static int rndis_join_ibss(struct wiphy *wiphy, struct net_device *dev,
 
 static int rndis_leave_ibss(struct wiphy *wiphy, struct net_device *dev);
 
-static int rndis_set_channel(struct wiphy *wiphy,
+static int rndis_set_channel(struct wiphy *wiphy, struct net_device *dev,
        struct ieee80211_channel *chan, enum nl80211_channel_type channel_type);
 
 static int rndis_add_key(struct wiphy *wiphy, struct net_device *netdev,
@@ -2290,7 +2290,7 @@ static int rndis_leave_ibss(struct wiphy *wiphy, struct net_device *dev)
        return deauthenticate(usbdev);
 }
 
-static int rndis_set_channel(struct wiphy *wiphy,
+static int rndis_set_channel(struct wiphy *wiphy, struct net_device *netdev,
        struct ieee80211_channel *chan, enum nl80211_channel_type channel_type)
 {
        struct rndis_wlan_private *priv = wiphy_priv(wiphy);
index f8750f9a65b8f26fe268d174758a03200fcc1080..b7c77f9712f4bedd172ac9ef9ecdfd23a8ac084b 100644 (file)
@@ -52,6 +52,8 @@
  *     %NL80211_ATTR_WIPHY_CHANNEL_TYPE, %NL80211_ATTR_WIPHY_RETRY_SHORT,
  *     %NL80211_ATTR_WIPHY_RETRY_LONG, %NL80211_ATTR_WIPHY_FRAG_THRESHOLD,
  *     and/or %NL80211_ATTR_WIPHY_RTS_THRESHOLD.
+ *     However, for setting the channel, see %NL80211_CMD_SET_CHANNEL
+ *     instead, the support here is for backward compatibility only.
  * @NL80211_CMD_NEW_WIPHY: Newly created wiphy, response to get request
  *     or rename notification. Has attributes %NL80211_ATTR_WIPHY and
  *     %NL80211_ATTR_WIPHY_NAME.
  * @NL80211_CMD_NOTIFY_CQM: Connection quality monitor notification. This
  *     command is used as an event to indicate the that a trigger level was
  *     reached.
+ * @NL80211_CMD_SET_CHANNEL: Set the channel (using %NL80211_ATTR_WIPHY_FREQ
+ *     and %NL80211_ATTR_WIPHY_CHANNEL_TYPE) the given interface (identifed
+ *     by %NL80211_ATTR_IFINDEX) shall operate on.
+ *     In case multiple channels are supported by the device, the mechanism
+ *     with which it switches channels is implementation-defined.
+ *     When a monitor interface is given, it can only switch channel while
+ *     no other interfaces are operating to avoid disturbing the operation
+ *     of any other interfaces, and other interfaces will again take
+ *     precedence when they are used.
  *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
@@ -428,6 +439,8 @@ enum nl80211_commands {
        NL80211_CMD_SET_CQM,
        NL80211_CMD_NOTIFY_CQM,
 
+       NL80211_CMD_SET_CHANNEL,
+
        /* add new commands above here */
 
        /* used to define NL80211_CMD_MAX below */
index 7d10c0182f53b8a6a40612ecfdb4322bcc018cfe..b44a2e5321a365468312d56ac7285c8ff09129ed 100644 (file)
@@ -966,7 +966,11 @@ struct cfg80211_pmksa {
  *
  * @set_txq_params: Set TX queue parameters
  *
- * @set_channel: Set channel
+ * @set_channel: Set channel for a given wireless interface. Some devices
+ *     may support multi-channel operation (by channel hopping) so cfg80211
+ *     doesn't verify much. Note, however, that the passed netdev may be
+ *     %NULL as well if the user requested changing the channel for the
+ *     device itself, or for a monitor interface.
  *
  * @scan: Request to do a scan. If returning zero, the scan request is given
  *     the driver, and will be valid until passed to cfg80211_scan_done().
@@ -1095,7 +1099,7 @@ struct cfg80211_ops {
        int     (*set_txq_params)(struct wiphy *wiphy,
                                  struct ieee80211_txq_params *params);
 
-       int     (*set_channel)(struct wiphy *wiphy,
+       int     (*set_channel)(struct wiphy *wiphy, struct net_device *dev,
                               struct ieee80211_channel *chan,
                               enum nl80211_channel_type channel_type);
 
@@ -1461,6 +1465,8 @@ struct cfg80211_cached_keys;
  * @list: (private) Used to collect the interfaces
  * @netdev: (private) Used to reference back to the netdev
  * @current_bss: (private) Used by the internal configuration code
+ * @channel: (private) Used by the internal configuration code to track
+ *     user-set AP, monitor and WDS channels for wireless extensions
  * @bssid: (private) Used by the internal configuration code
  * @ssid: (private) Used by the internal configuration code
  * @ssid_len: (private) Used by the internal configuration code
@@ -1507,6 +1513,7 @@ struct wireless_dev {
        struct cfg80211_internal_bss *authtry_bsses[MAX_AUTH_BSSES];
        struct cfg80211_internal_bss *auth_bsses[MAX_AUTH_BSSES];
        struct cfg80211_internal_bss *current_bss; /* associated / joined */
+       struct ieee80211_channel *channel;
 
        bool ps;
        int ps_timeout;
index 04420291e7ad7b0d85e3456cbe93c5804dd2d6f9..84b48ba8a77e559dcc5b1d8120f5428b4c07314c 100644 (file)
@@ -23,7 +23,8 @@ mac80211-y := \
        key.o \
        util.o \
        wme.o \
-       event.o
+       event.o \
+       chan.o
 
 mac80211-$(CONFIG_MAC80211_LEDS) += led.o
 mac80211-$(CONFIG_MAC80211_DEBUGFS) += \
index b575a5066219c1eac62397ad3d4c9a666351fb7f..414b7dd7d7fdaaa66c0e891e2bfa3bb74ae35a61 100644 (file)
@@ -1161,11 +1161,24 @@ static int ieee80211_set_txq_params(struct wiphy *wiphy,
 }
 
 static int ieee80211_set_channel(struct wiphy *wiphy,
+                                struct net_device *netdev,
                                 struct ieee80211_channel *chan,
                                 enum nl80211_channel_type channel_type)
 {
        struct ieee80211_local *local = wiphy_priv(wiphy);
 
+       switch (ieee80211_get_channel_mode(local, NULL)) {
+       case CHAN_MODE_HOPPING:
+               return -EBUSY;
+       case CHAN_MODE_FIXED:
+               if (local->oper_channel == chan &&
+                   local->oper_channel_type == channel_type)
+                       return 0;
+               return -EBUSY;
+       case CHAN_MODE_UNDEFINED:
+               break;
+       }
+
        local->oper_channel = chan;
        local->oper_channel_type = channel_type;
 
@@ -1213,6 +1226,20 @@ static int ieee80211_auth(struct wiphy *wiphy, struct net_device *dev,
 static int ieee80211_assoc(struct wiphy *wiphy, struct net_device *dev,
                           struct cfg80211_assoc_request *req)
 {
+       struct ieee80211_local *local = wiphy_priv(wiphy);
+       struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+
+       switch (ieee80211_get_channel_mode(local, sdata)) {
+       case CHAN_MODE_HOPPING:
+               return -EBUSY;
+       case CHAN_MODE_FIXED:
+               if (local->oper_channel == req->bss->channel)
+                       break;
+               return -EBUSY;
+       case CHAN_MODE_UNDEFINED:
+               break;
+       }
+
        return ieee80211_mgd_assoc(IEEE80211_DEV_TO_SUB_IF(dev), req);
 }
 
@@ -1235,8 +1262,22 @@ static int ieee80211_disassoc(struct wiphy *wiphy, struct net_device *dev,
 static int ieee80211_join_ibss(struct wiphy *wiphy, struct net_device *dev,
                               struct cfg80211_ibss_params *params)
 {
+       struct ieee80211_local *local = wiphy_priv(wiphy);
        struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 
+       switch (ieee80211_get_channel_mode(local, sdata)) {
+       case CHAN_MODE_HOPPING:
+               return -EBUSY;
+       case CHAN_MODE_FIXED:
+               if (!params->channel_fixed)
+                       return -EBUSY;
+               if (local->oper_channel == params->channel)
+                       break;
+               return -EBUSY;
+       case CHAN_MODE_UNDEFINED:
+               break;
+       }
+
        return ieee80211_ibss_join(sdata, params);
 }
 
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
new file mode 100644 (file)
index 0000000..08f3832
--- /dev/null
@@ -0,0 +1,57 @@
+/*
+ * mac80211 - channel management
+ */
+
+#include "ieee80211_i.h"
+
+enum ieee80211_chan_mode
+__ieee80211_get_channel_mode(struct ieee80211_local *local,
+                            struct ieee80211_sub_if_data *ignore)
+{
+       struct ieee80211_sub_if_data *sdata;
+
+       WARN_ON(!mutex_is_locked(&local->iflist_mtx));
+
+       list_for_each_entry(sdata, &local->interfaces, list) {
+               if (sdata == ignore)
+                       continue;
+
+               if (!ieee80211_sdata_running(sdata))
+                       continue;
+
+               if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
+                       continue;
+
+               if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+                   !sdata->u.mgd.associated)
+                       continue;
+
+               if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+                       if (!sdata->u.ibss.ssid_len)
+                               continue;
+                       if (!sdata->u.ibss.fixed_channel)
+                               return CHAN_MODE_HOPPING;
+               }
+
+               if (sdata->vif.type == NL80211_IFTYPE_AP &&
+                   !sdata->u.ap.beacon)
+                       continue;
+
+               return CHAN_MODE_FIXED;
+       }
+
+       return CHAN_MODE_UNDEFINED;
+}
+
+enum ieee80211_chan_mode
+ieee80211_get_channel_mode(struct ieee80211_local *local,
+                          struct ieee80211_sub_if_data *ignore)
+{
+       enum ieee80211_chan_mode mode;
+
+       mutex_lock(&local->iflist_mtx);
+       mode = __ieee80211_get_channel_mode(local, ignore);
+       mutex_unlock(&local->iflist_mtx);
+
+       return mode;
+}
index c8077a3647c68b45a28ad3f93e845b92ee4c7551..359edff3147120c9893e1f8188de50a538b3963b 100644 (file)
@@ -1229,6 +1229,17 @@ int ieee80211_wk_remain_on_channel(struct ieee80211_sub_if_data *sdata,
 int ieee80211_wk_cancel_remain_on_channel(
        struct ieee80211_sub_if_data *sdata, u64 cookie);
 
+/* channel management */
+enum ieee80211_chan_mode {
+       CHAN_MODE_UNDEFINED,
+       CHAN_MODE_HOPPING,
+       CHAN_MODE_FIXED,
+};
+
+enum ieee80211_chan_mode
+ieee80211_get_channel_mode(struct ieee80211_local *local,
+                          struct ieee80211_sub_if_data *ignore);
+
 #ifdef CONFIG_MAC80211_NOINLINE
 #define debug_noinline noinline
 #else
index bf1737fc9a7e47fe448e71a058334fb5fdb1b068..d92d088026bf885e30607f81799781a4c94c2794 100644 (file)
@@ -9,38 +9,6 @@
 #include <net/cfg80211.h>
 #include "core.h"
 
-struct ieee80211_channel *
-rdev_fixed_channel(struct cfg80211_registered_device *rdev,
-                  struct wireless_dev *for_wdev)
-{
-       struct wireless_dev *wdev;
-       struct ieee80211_channel *result = NULL;
-
-       WARN_ON(!mutex_is_locked(&rdev->devlist_mtx));
-
-       list_for_each_entry(wdev, &rdev->netdev_list, list) {
-               if (wdev == for_wdev)
-                       continue;
-
-               /*
-                * Lock manually to tell lockdep about allowed
-                * nesting here if for_wdev->mtx is held already.
-                * This is ok as it's all under the rdev devlist
-                * mutex and as such can only be done once at any
-                * given time.
-                */
-               mutex_lock_nested(&wdev->mtx, SINGLE_DEPTH_NESTING);
-               if (wdev->current_bss)
-                       result = wdev->current_bss->pub.channel;
-               wdev_unlock(wdev);
-
-               if (result)
-                       break;
-       }
-
-       return result;
-}
-
 struct ieee80211_channel *
 rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
                  int freq, enum nl80211_channel_type channel_type)
@@ -75,15 +43,22 @@ rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
        return chan;
 }
 
-int rdev_set_freq(struct cfg80211_registered_device *rdev,
-                 struct wireless_dev *for_wdev,
-                 int freq, enum nl80211_channel_type channel_type)
+int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
+                     struct wireless_dev *wdev, int freq,
+                     enum nl80211_channel_type channel_type)
 {
        struct ieee80211_channel *chan;
        int result;
 
-       if (rdev_fixed_channel(rdev, for_wdev))
-               return -EBUSY;
+       if (wdev->iftype == NL80211_IFTYPE_MONITOR)
+               wdev = NULL;
+
+       if (wdev) {
+               ASSERT_WDEV_LOCK(wdev);
+
+               if (!netif_running(wdev->netdev))
+                       return -ENETDOWN;
+       }
 
        if (!rdev->ops->set_channel)
                return -EOPNOTSUPP;
@@ -92,11 +67,14 @@ int rdev_set_freq(struct cfg80211_registered_device *rdev,
        if (!chan)
                return -EINVAL;
 
-       result = rdev->ops->set_channel(&rdev->wiphy, chan, channel_type);
+       result = rdev->ops->set_channel(&rdev->wiphy,
+                                       wdev ? wdev->netdev : NULL,
+                                       chan, channel_type);
        if (result)
                return result;
 
-       rdev->channel = chan;
+       if (wdev)
+               wdev->channel = chan;
 
        return 0;
 }
index b2234b436ead117d4fee49cd56b27fbfa6d36f55..ae930acf75e9fb45bef945da23a0fdd1690e61f6 100644 (file)
@@ -70,9 +70,6 @@ struct cfg80211_registered_device {
        struct work_struct conn_work;
        struct work_struct event_work;
 
-       /* current channel */
-       struct ieee80211_channel *channel;
-
        /* must be last because of the way we do wiphy_priv(),
         * and it should at least be aligned to NETDEV_ALIGN */
        struct wiphy wiphy __attribute__((__aligned__(NETDEV_ALIGN)));
@@ -387,15 +384,12 @@ int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
                          u32 *flags, struct vif_params *params);
 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev);
 
-struct ieee80211_channel *
-rdev_fixed_channel(struct cfg80211_registered_device *rdev,
-                  struct wireless_dev *for_wdev);
 struct ieee80211_channel *
 rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
                  int freq, enum nl80211_channel_type channel_type);
-int rdev_set_freq(struct cfg80211_registered_device *rdev,
-                 struct wireless_dev *for_wdev,
-                 int freq, enum nl80211_channel_type channel_type);
+int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
+                     struct wireless_dev *wdev, int freq,
+                     enum nl80211_channel_type channel_type);
 
 u16 cfg80211_calculate_bitrate(struct rate_info *rate);
 
index 6ef5a491fb4b018b866ff22f19b6e717fb90d4f7..9825317e653aaf748c7511083c64ea62c5bb2417 100644 (file)
@@ -80,15 +80,10 @@ int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
                         struct cfg80211_cached_keys *connkeys)
 {
        struct wireless_dev *wdev = dev->ieee80211_ptr;
-       struct ieee80211_channel *chan;
        int err;
 
        ASSERT_WDEV_LOCK(wdev);
 
-       chan = rdev_fixed_channel(rdev, wdev);
-       if (chan && chan != params->channel)
-               return -EBUSY;
-
        if (wdev->ssid_len)
                return -EALREADY;
 
index c27bef8e0c11a3bebd3b0e34f328551a9d5ec3ed..ec1b4a896c6ea01ad54d57ea56ebbf7f0ea90521 100644 (file)
@@ -588,6 +588,7 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
                i++;
                NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
        }
+       CMD(set_channel, SET_CHANNEL);
 
 #undef CMD
 
@@ -688,10 +689,90 @@ static int parse_txq_params(struct nlattr *tb[],
        return 0;
 }
 
+static bool nl80211_can_set_dev_channel(struct wireless_dev *wdev)
+{
+       /*
+        * You can only set the channel explicitly for AP, mesh
+        * and WDS type interfaces; all others have their channel
+        * managed via their respective "establish a connection"
+        * command (connect, join, ...)
+        *
+        * Monitors are special as they are normally slaved to
+        * whatever else is going on, so they behave as though
+        * you tried setting the wiphy channel itself.
+        */
+       return !wdev ||
+               wdev->iftype == NL80211_IFTYPE_AP ||
+               wdev->iftype == NL80211_IFTYPE_WDS ||
+               wdev->iftype == NL80211_IFTYPE_MESH_POINT ||
+               wdev->iftype == NL80211_IFTYPE_MONITOR;
+}
+
+static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
+                                struct wireless_dev *wdev,
+                                struct genl_info *info)
+{
+       enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
+       u32 freq;
+       int result;
+
+       if (!info->attrs[NL80211_ATTR_WIPHY_FREQ])
+               return -EINVAL;
+
+       if (!nl80211_can_set_dev_channel(wdev))
+               return -EOPNOTSUPP;
+
+       if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
+               channel_type = nla_get_u32(info->attrs[
+                                  NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
+               if (channel_type != NL80211_CHAN_NO_HT &&
+                   channel_type != NL80211_CHAN_HT20 &&
+                   channel_type != NL80211_CHAN_HT40PLUS &&
+                   channel_type != NL80211_CHAN_HT40MINUS)
+                       return -EINVAL;
+       }
+
+       freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
+
+       mutex_lock(&rdev->devlist_mtx);
+       if (wdev) {
+               wdev_lock(wdev);
+               result = cfg80211_set_freq(rdev, wdev, freq, channel_type);
+               wdev_unlock(wdev);
+       } else {
+               result = cfg80211_set_freq(rdev, NULL, freq, channel_type);
+       }
+       mutex_unlock(&rdev->devlist_mtx);
+
+       return result;
+}
+
+static int nl80211_set_channel(struct sk_buff *skb, struct genl_info *info)
+{
+       struct cfg80211_registered_device *rdev;
+       struct net_device *netdev;
+       int result;
+
+       rtnl_lock();
+
+       result = get_rdev_dev_by_info_ifindex(info, &rdev, &netdev);
+       if (result)
+               goto unlock;
+
+       result = __nl80211_set_channel(rdev, netdev->ieee80211_ptr, info);
+
+ unlock:
+       rtnl_unlock();
+
+       return result;
+}
+
 static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 {
        struct cfg80211_registered_device *rdev;
-       int result = 0, rem_txq_params = 0;
+       struct net_device *netdev = NULL;
+       struct wireless_dev *wdev;
+       int result, rem_txq_params = 0;
        struct nlattr *nl_txq_params;
        u32 changed;
        u8 retry_short = 0, retry_long = 0;
@@ -700,16 +781,50 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 
        rtnl_lock();
 
+       /*
+        * Try to find the wiphy and netdev. Normally this
+        * function shouldn't need the netdev, but this is
+        * done for backward compatibility -- previously
+        * setting the channel was done per wiphy, but now
+        * it is per netdev. Previous userland like hostapd
+        * also passed a netdev to set_wiphy, so that it is
+        * possible to let that go to the right netdev!
+        */
        mutex_lock(&cfg80211_mutex);
 
-       rdev = __cfg80211_rdev_from_info(info);
-       if (IS_ERR(rdev)) {
-               mutex_unlock(&cfg80211_mutex);
-               result = PTR_ERR(rdev);
-               goto unlock;
+       if (info->attrs[NL80211_ATTR_IFINDEX]) {
+               int ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);
+
+               netdev = dev_get_by_index(genl_info_net(info), ifindex);
+               if (netdev && netdev->ieee80211_ptr) {
+                       rdev = wiphy_to_dev(netdev->ieee80211_ptr->wiphy);
+                       mutex_lock(&rdev->mtx);
+               } else
+                       netdev = NULL;
        }
 
-       mutex_lock(&rdev->mtx);
+       if (!netdev) {
+               rdev = __cfg80211_rdev_from_info(info);
+               if (IS_ERR(rdev)) {
+                       mutex_unlock(&cfg80211_mutex);
+                       result = PTR_ERR(rdev);
+                       goto unlock;
+               }
+               wdev = NULL;
+               netdev = NULL;
+               result = 0;
+
+               mutex_lock(&rdev->mtx);
+       } else if (netif_running(netdev) &&
+                  nl80211_can_set_dev_channel(netdev->ieee80211_ptr))
+               wdev = netdev->ieee80211_ptr;
+       else
+               wdev = NULL;
+
+       /*
+        * end workaround code, by now the rdev is available
+        * and locked, and wdev may or may not be NULL.
+        */
 
        if (info->attrs[NL80211_ATTR_WIPHY_NAME])
                result = cfg80211_dev_rename(
@@ -748,26 +863,7 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
        }
 
        if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
-               enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
-               u32 freq;
-
-               result = -EINVAL;
-
-               if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
-                       channel_type = nla_get_u32(info->attrs[
-                                          NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
-                       if (channel_type != NL80211_CHAN_NO_HT &&
-                           channel_type != NL80211_CHAN_HT20 &&
-                           channel_type != NL80211_CHAN_HT40PLUS &&
-                           channel_type != NL80211_CHAN_HT40MINUS)
-                               goto bad_res;
-               }
-
-               freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
-
-               mutex_lock(&rdev->devlist_mtx);
-               result = rdev_set_freq(rdev, NULL, freq, channel_type);
-               mutex_unlock(&rdev->devlist_mtx);
+               result = __nl80211_set_channel(rdev, wdev, info);
                if (result)
                        goto bad_res;
        }
@@ -864,6 +960,8 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
 
  bad_res:
        mutex_unlock(&rdev->mtx);
+       if (netdev)
+               dev_put(netdev);
  unlock:
        rtnl_unlock();
        return result;
@@ -3561,9 +3659,8 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
 {
        struct cfg80211_registered_device *rdev;
        struct net_device *dev;
-       struct wireless_dev *wdev;
        struct cfg80211_crypto_settings crypto;
-       struct ieee80211_channel *chan, *fixedchan;
+       struct ieee80211_channel *chan;
        const u8 *bssid, *ssid, *ie = NULL, *prev_bssid = NULL;
        int err, ssid_len, ie_len = 0;
        bool use_mfp = false;
@@ -3606,16 +3703,6 @@ static int nl80211_associate(struct sk_buff *skb, struct genl_info *info)
                goto out;
        }
 
-       mutex_lock(&rdev->devlist_mtx);
-       wdev = dev->ieee80211_ptr;
-       fixedchan = rdev_fixed_channel(rdev, wdev);
-       if (fixedchan && chan != fixedchan) {
-               err = -EBUSY;
-               mutex_unlock(&rdev->devlist_mtx);
-               goto out;
-       }
-       mutex_unlock(&rdev->devlist_mtx);
-
        ssid = nla_data(info->attrs[NL80211_ATTR_SSID]);
        ssid_len = nla_len(info->attrs[NL80211_ATTR_SSID]);
 
@@ -5185,6 +5272,12 @@ static struct genl_ops nl80211_ops[] = {
                .policy = nl80211_policy,
                .flags = GENL_ADMIN_PERM,
        },
+       {
+               .cmd = NL80211_CMD_SET_CHANNEL,
+               .doit = nl80211_set_channel,
+               .policy = nl80211_policy,
+               .flags = GENL_ADMIN_PERM,
+       },
 };
 
 static struct genl_multicast_group nl80211_mlme_mcgrp = {
index dcd7685242f77fc3bbe8b3fd6006c1a43a8b18e0..14cf8163912ad3a28c348c00efe3e455ba0c4311 100644 (file)
@@ -740,7 +740,6 @@ int __cfg80211_connect(struct cfg80211_registered_device *rdev,
                       const u8 *prev_bssid)
 {
        struct wireless_dev *wdev = dev->ieee80211_ptr;
-       struct ieee80211_channel *chan;
        struct cfg80211_bss *bss = NULL;
        int err;
 
@@ -749,10 +748,6 @@ int __cfg80211_connect(struct cfg80211_registered_device *rdev,
        if (wdev->sme_state != CFG80211_SME_IDLE)
                return -EALREADY;
 
-       chan = rdev_fixed_channel(rdev, wdev);
-       if (chan && chan != connect->channel)
-               return -EBUSY;
-
        if (WARN_ON(wdev->connect_keys)) {
                kfree(wdev->connect_keys);
                wdev->connect_keys = NULL;
index 9ab51838849eee380faeceb52772aa128420fd02..75848c6cb22a0d0ee6adda4974148f5ff2dd0ae6 100644 (file)
@@ -781,16 +781,22 @@ int cfg80211_wext_siwfreq(struct net_device *dev,
                return cfg80211_mgd_wext_siwfreq(dev, info, wextfreq, extra);
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_ibss_wext_siwfreq(dev, info, wextfreq, extra);
-       default:
+       case NL80211_IFTYPE_MONITOR:
+       case NL80211_IFTYPE_WDS:
+       case NL80211_IFTYPE_MESH_POINT:
                freq = cfg80211_wext_freq(wdev->wiphy, wextfreq);
                if (freq < 0)
                        return freq;
                if (freq == 0)
                        return -EINVAL;
+               wdev_lock(wdev);
                mutex_lock(&rdev->devlist_mtx);
-               err = rdev_set_freq(rdev, NULL, freq, NL80211_CHAN_NO_HT);
+               err = cfg80211_set_freq(rdev, wdev, freq, NL80211_CHAN_NO_HT);
                mutex_unlock(&rdev->devlist_mtx);
+               wdev_unlock(wdev);
                return err;
+       default:
+               return -EOPNOTSUPP;
        }
 }
 EXPORT_SYMBOL_GPL(cfg80211_wext_siwfreq);
@@ -800,7 +806,6 @@ int cfg80211_wext_giwfreq(struct net_device *dev,
                          struct iw_freq *freq, char *extra)
 {
        struct wireless_dev *wdev = dev->ieee80211_ptr;
-       struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 
        switch (wdev->iftype) {
        case NL80211_IFTYPE_STATION:
@@ -808,9 +813,9 @@ int cfg80211_wext_giwfreq(struct net_device *dev,
        case NL80211_IFTYPE_ADHOC:
                return cfg80211_ibss_wext_giwfreq(dev, info, freq, extra);
        default:
-               if (!rdev->channel)
+               if (!wdev->channel)
                        return -EINVAL;
-               freq->m = rdev->channel->center_freq;
+               freq->m = wdev->channel->center_freq;
                freq->e = 6;
                return 0;
        }
index 5615a88025367f5beaee4e90e9040d5e4deb9f15..8e5ab4f4e9c4b142db5162ef70e5788e10dad53b 100644 (file)
@@ -107,7 +107,7 @@ int cfg80211_mgd_wext_siwfreq(struct net_device *dev,
 
        /* SSID is not set, we just want to switch channel */
        if (chan && !wdev->wext.connect.ssid_len) {
-               err = rdev_set_freq(rdev, wdev, freq, NL80211_CHAN_NO_HT);
+               err = cfg80211_set_freq(rdev, wdev, freq, NL80211_CHAN_NO_HT);
                goto out;
        }