2 files changed, 121 insertions, 13 deletions

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 86f777af79e8..977da58fb7ea 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -308,21 +308,86 @@ struct key_params {
 /**
  * struct cfg80211_chan_def - channel definition
  * @chan: the (control) channel
- * @_type: the channel type, don't use this field,
- *      use cfg80211_get_chandef_type() if needed.
+ * @width: channel width
+ * @center_freq1: center frequency of first segment
+ * @center_freq2: center frequency of second segment
+ *      (only with 80+80 MHz)
  */
 struct cfg80211_chan_def {
         struct ieee80211_channel *chan;
-        enum nl80211_channel_type _type;
+        enum nl80211_chan_width width;
+        u32 center_freq1;
+        u32 center_freq2;
 };
 
+/**
+ * cfg80211_get_chandef_type - return old channel type from chandef
+ * @chandef: the channel definition
+ *
+ * Returns the old channel type (NOHT, HT20, HT40+/-) from a given
+ * chandef, which must have a bandwidth allowing this conversion.
+ */
 static inline enum nl80211_channel_type
 cfg80211_get_chandef_type(const struct cfg80211_chan_def *chandef)
 {
-        return chandef->_type;
+        switch (chandef->width) {
+        case NL80211_CHAN_WIDTH_20_NOHT:
+                return NL80211_CHAN_NO_HT;
+        case NL80211_CHAN_WIDTH_20:
+                return NL80211_CHAN_HT20;
+        case NL80211_CHAN_WIDTH_40:
+                if (chandef->center_freq1 > chandef->chan->center_freq)
+                        return NL80211_CHAN_HT40PLUS;
+                return NL80211_CHAN_HT40MINUS;
+        default:
+                WARN_ON(1);
+                return NL80211_CHAN_NO_HT;
+        }
+}
+
+/**
+ * cfg80211_chandef_create - create channel definition using channel type
+ * @chandef: the channel definition struct to fill
+ * @channel: the control channel
+ * @chantype: the channel type
+ *
+ * Given a channel type, create a channel definition.
+ */
+void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
+                             struct ieee80211_channel *channel,
+                             enum nl80211_channel_type chantype);
+
+/**
+ * cfg80211_chandef_identical - check if two channel definitions are identical
+ * @chandef1: first channel definition
+ * @chandef2: second channel definition
+ *
+ * Returns %true if the channels defined by the channel definitions are
+ * identical, %false otherwise.
+ */
+static inline bool
+cfg80211_chandef_identical(const struct cfg80211_chan_def *chandef1,
+                           const struct cfg80211_chan_def *chandef2)
+{
+        return (chandef1->chan == chandef2->chan &&
+                chandef1->width == chandef2->width &&
+                chandef1->center_freq1 == chandef2->center_freq1 &&
+                chandef1->center_freq2 == chandef2->center_freq2);
 }
 
 /**
+ * cfg80211_chandef_compatible - check if two channel definitions are compatible
+ * @chandef1: first channel definition
+ * @chandef2: second channel definition
+ *
+ * Returns %NULL if the given channel definitions are incompatible,
+ * chandef1 or chandef2 otherwise.
+ */
+const struct cfg80211_chan_def *
+cfg80211_chandef_compatible(const struct cfg80211_chan_def *chandef1,
+                            const struct cfg80211_chan_def *chandef2);
+
+/**
  * enum survey_info_flags - survey information flags
  *
  * @SURVEY_INFO_NOISE_DBM: noise (in dBm) was filled in
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 82b5ad38435b..84f9c7d84c69 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -118,8 +118,9 @@
  *      to get a list of all present wiphys.
  * @NL80211_CMD_SET_WIPHY: set wiphy parameters, needs %NL80211_ATTR_WIPHY or
  *      %NL80211_ATTR_IFINDEX; can be used to set %NL80211_ATTR_WIPHY_NAME,
- *      %NL80211_ATTR_WIPHY_TXQ_PARAMS, %NL80211_ATTR_WIPHY_FREQ,
- *      %NL80211_ATTR_WIPHY_CHANNEL_TYPE, %NL80211_ATTR_WIPHY_RETRY_SHORT,
+ *      %NL80211_ATTR_WIPHY_TXQ_PARAMS, %NL80211_ATTR_WIPHY_FREQ (and the
+ *      attributes determining the channel width; this is used for setting
+ *      monitor mode channel),  %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
@@ -171,7 +172,7 @@
  *      %NL80211_ATTR_AKM_SUITES, %NL80211_ATTR_PRIVACY,
  *      %NL80211_ATTR_AUTH_TYPE and %NL80211_ATTR_INACTIVITY_TIMEOUT.
  *      The channel to use can be set on the interface or be given using the
- *      %NL80211_ATTR_WIPHY_FREQ and %NL80211_ATTR_WIPHY_CHANNEL_TYPE attrs.
+ *      %NL80211_ATTR_WIPHY_FREQ and the attributes determining channel width.
  * @NL80211_CMD_NEW_BEACON: old alias for %NL80211_CMD_START_AP
  * @NL80211_CMD_STOP_AP: Stop AP operation on the given interface
  * @NL80211_CMD_DEL_BEACON: old alias for %NL80211_CMD_STOP_AP
@@ -471,8 +472,8 @@
  *      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.
+ *      and the attributes determining channel width) 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
@@ -566,8 +567,8 @@
  *
  * @NL80211_CMD_CH_SWITCH_NOTIFY: An AP or GO may decide to switch channels
  *      independently of the userspace SME, send this event indicating
- *      %NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ with
- *      %NL80211_ATTR_WIPHY_CHANNEL_TYPE.
+ *      %NL80211_ATTR_IFINDEX is now on %NL80211_ATTR_WIPHY_FREQ and the
+ *      attributes determining channel width.
  *
  * @NL80211_CMD_START_P2P_DEVICE: Start the given P2P Device, identified by
  *      its %NL80211_ATTR_WDEV identifier. It must have been created with
@@ -771,14 +772,26 @@ enum nl80211_commands {
  *      /sys/class/ieee80211/<phyname>/index
  * @NL80211_ATTR_WIPHY_NAME: wiphy name (used for renaming)
  * @NL80211_ATTR_WIPHY_TXQ_PARAMS: a nested array of TX queue parameters
- * @NL80211_ATTR_WIPHY_FREQ: frequency of the selected channel in MHz
+ * @NL80211_ATTR_WIPHY_FREQ: frequency of the selected channel in MHz,
+ *      defines the channel together with the (deprecated)
+ *      %NL80211_ATTR_WIPHY_CHANNEL_TYPE attribute or the attributes
+ *      %NL80211_ATTR_CHANNEL_WIDTH and if needed %NL80211_ATTR_CENTER_FREQ1
+ *      and %NL80211_ATTR_CENTER_FREQ2
+ * @NL80211_ATTR_CHANNEL_WIDTH: u32 attribute containing one of the values
+ *      of &enum nl80211_chan_width, describing the channel width. See the
+ *      documentation of the enum for more information.
+ * @NL80211_ATTR_CENTER_FREQ1: Center frequency of the first part of the
+ *      channel, used for anything but 20 MHz bandwidth
+ * @NL80211_ATTR_CENTER_FREQ2: Center frequency of the second part of the
+ *      channel, used only for 80+80 MHz bandwidth
  * @NL80211_ATTR_WIPHY_CHANNEL_TYPE: included with NL80211_ATTR_WIPHY_FREQ
- *      if HT20 or HT40 are allowed (i.e., 802.11n disabled if not included):
+ *      if HT20 or HT40 are to be used (i.e., HT disabled if not included):
  *      NL80211_CHAN_NO_HT = HT not allowed (i.e., same as not including
  *              this attribute)
  *      NL80211_CHAN_HT20 = HT20 only
  *      NL80211_CHAN_HT40MINUS = secondary channel is below the primary channel
  *      NL80211_CHAN_HT40PLUS = secondary channel is above the primary channel
+ *      This attribute is now deprecated.
  * @NL80211_ATTR_WIPHY_RETRY_SHORT: TX retry limit for frames whose length is
  *      less than or equal to the RTS threshold; allowed range: 1..255;
  *      dot11ShortRetryLimit; u8
@@ -1553,6 +1566,10 @@ enum nl80211_attrs {
 
         NL80211_ATTR_SCAN_FLAGS,
 
+        NL80211_ATTR_CHANNEL_WIDTH,
+        NL80211_ATTR_CENTER_FREQ1,
+        NL80211_ATTR_CENTER_FREQ2,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,
@@ -2455,6 +2472,32 @@ enum nl80211_channel_type {
 };
 
 /**
+ * enum nl80211_chan_width - channel width definitions
+ *
+ * These values are used with the %NL80211_ATTR_CHANNEL_WIDTH
+ * attribute.
+ *
+ * @NL80211_CHAN_WIDTH_20_NOHT: 20 MHz, non-HT channel
+ * @NL80211_CHAN_WIDTH_20: 20 MHz HT channel
+ * @NL80211_CHAN_WIDTH_40: 40 MHz channel, the %NL80211_ATTR_CENTER_FREQ1
+ *      attribute must be provided as well
+ * @NL80211_CHAN_WIDTH_80: 80 MHz channel, the %NL80211_ATTR_CENTER_FREQ1
+ *      attribute must be provided as well
+ * @NL80211_CHAN_WIDTH_80P80: 80+80 MHz channel, the %NL80211_ATTR_CENTER_FREQ1
+ *      and %NL80211_ATTR_CENTER_FREQ2 attributes must be provided as well
+ * @NL80211_CHAN_WIDTH_160: 160 MHz channel, the %NL80211_ATTR_CENTER_FREQ1
+ *      attribute must be provided as well
+ */
+enum nl80211_chan_width {
+        NL80211_CHAN_WIDTH_20_NOHT,
+        NL80211_CHAN_WIDTH_20,
+        NL80211_CHAN_WIDTH_40,
+        NL80211_CHAN_WIDTH_80,
+        NL80211_CHAN_WIDTH_80P80,
+        NL80211_CHAN_WIDTH_160,
+};
+
+/**
  * enum nl80211_bss - netlink attributes for a BSS
  *
  * @__NL80211_BSS_INVALID: invalid