cfg80211/nl80211: scanning (and mac80211 update to use it)

This patch adds basic scan capability to cfg80211/nl80211 and
changes mac80211 to use it. The BSS list that cfg80211 maintains
is made driver-accessible with a private area in each BSS struct,
but mac80211 doesn't yet use it. That's another large project.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 65 insertions, 0 deletions

diff --git a/include/linux/nl80211.h b/include/linux/nl80211.h
index 4bc27049f4e5..8802d1bda382 100644
--- a/include/linux/nl80211.h
+++ b/include/linux/nl80211.h
@@ -143,6 +143,13 @@
  *      added to all specified management frames generated by
  *      kernel/firmware/driver.
  *
+ * @NL80211_CMD_GET_SCAN: get scan results
+ * @NL80211_CMD_TRIGGER_SCAN: trigger a new scan with the given parameters
+ * @NL80211_CMD_NEW_SCAN_RESULTS: scan notification (as a reply to
+ *      NL80211_CMD_GET_SCAN and on the "scan" multicast group)
+ * @NL80211_CMD_SCAN_ABORTED: scan was aborted, for unspecified reasons,
+ *      partial scan results may be available
+ *
  * @NL80211_CMD_MAX: highest used command number
  * @__NL80211_CMD_AFTER_LAST: internal use
  */
@@ -192,6 +199,11 @@ enum nl80211_commands {
 
         NL80211_CMD_GET_REG,
 
+        NL80211_CMD_GET_SCAN,
+        NL80211_CMD_TRIGGER_SCAN,
+        NL80211_CMD_NEW_SCAN_RESULTS,
+        NL80211_CMD_SCAN_ABORTED,
+
         /* add new commands above here */
 
         /* used to define NL80211_CMD_MAX below */
@@ -305,6 +317,18 @@ enum nl80211_commands {
  * @NL80211_ATTR_IE: Information element(s) data (used, e.g., with
  *      %NL80211_CMD_SET_MGMT_EXTRA_IE).
  *
+ * @NL80211_ATTR_MAX_NUM_SCAN_SSIDS: number of SSIDs you can scan with
+ *      a single scan request, a wiphy attribute.
+ *
+ * @NL80211_ATTR_SCAN_FREQUENCIES: nested attribute with frequencies (in MHz)
+ * @NL80211_ATTR_SCAN_SSIDS: nested attribute with SSIDs, leave out for passive
+ *      scanning and include a zero-length SSID (wildcard) for wildcard scan
+ * @NL80211_ATTR_SCAN_GENERATION: the scan generation increases whenever the
+ *      scan result list changes (BSS expired or added) so that applications
+ *      can verify that they got a single, consistent snapshot (when all dump
+ *      messages carried the same generation number)
+ * @NL80211_ATTR_BSS: scan result BSS
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -372,6 +396,13 @@ enum nl80211_attrs {
         NL80211_ATTR_MGMT_SUBTYPE,
         NL80211_ATTR_IE,
 
+        NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
+
+        NL80211_ATTR_SCAN_FREQUENCIES,
+        NL80211_ATTR_SCAN_SSIDS,
+        NL80211_ATTR_SCAN_GENERATION,
+        NL80211_ATTR_BSS,
+
         /* add attributes here, update the policy in nl80211.c */
 
         __NL80211_ATTR_AFTER_LAST,
@@ -841,4 +872,38 @@ enum nl80211_channel_type {
         NL80211_CHAN_HT40MINUS,
         NL80211_CHAN_HT40PLUS
 };
+
+/**
+ * enum nl80211_bss - netlink attributes for a BSS
+ *
+ * @__NL80211_BSS_INVALID: invalid
+ * @NL80211_BSS_FREQUENCY: frequency in MHz (u32)
+ * @NL80211_BSS_TSF: TSF of the received probe response/beacon (u64)
+ * @NL80211_BSS_BEACON_INTERVAL: beacon interval of the (I)BSS (u16)
+ * @NL80211_BSS_CAPABILITY: capability field (CPU order, u16)
+ * @NL80211_BSS_INFORMATION_ELEMENTS: binary attribute containing the
+ *      raw information elements from the probe response/beacon (bin)
+ * @NL80211_BSS_SIGNAL_MBM: signal strength of probe response/beacon
+ *      in mBm (100 * dBm) (s32)
+ * @NL80211_BSS_SIGNAL_UNSPEC: signal strength of the probe response/beacon
+ *      in unspecified units, scaled to 0..100 (u8)
+ * @__NL80211_BSS_AFTER_LAST: internal
+ * @NL80211_BSS_MAX: highest BSS attribute
+ */
+enum nl80211_bss {
+        __NL80211_BSS_INVALID,
+        NL80211_BSS_BSSID,
+        NL80211_BSS_FREQUENCY,
+        NL80211_BSS_TSF,
+        NL80211_BSS_BEACON_INTERVAL,
+        NL80211_BSS_CAPABILITY,
+        NL80211_BSS_INFORMATION_ELEMENTS,
+        NL80211_BSS_SIGNAL_MBM,
+        NL80211_BSS_SIGNAL_UNSPEC,
+
+        /* keep last */
+        __NL80211_BSS_AFTER_LAST,
+        NL80211_BSS_MAX = __NL80211_BSS_AFTER_LAST - 1
+};
+
 #endif /* __LINUX_NL80211_H */