introduce WEXT scan capabilities

Introduce scan capabilities to WEXT so that userspace can do intelligent
things with scan behavior such as handling hidden SSIDs more gracefully.
If the driver reports a specific scan capability, the driver must
respect the options specified in the iw_scan_req structure when handling
the SIOCSIWSCAN call, unless it's mode or state does not allow it to do
so, in which case it must return an error.

This version switches to Dave Kilroy's suggestion of claiming unused
padding space for the scan_capa field.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/wireless/hostap/hostap_ioctl.c b/drivers/net/wireless/hostap/hostap_ioctl.c
index d8f5efc..3a57d48 100644 (file)
--- a/drivers/net/wireless/hostap/hostap_ioctl.c
+++ b/drivers/net/wireless/hostap/hostap_ioctl.c
@@ -1089,6 +1089,9 @@ static int prism2_ioctl_giwrange(struct net_device *dev,
        range->enc_capa = IW_ENC_CAPA_WPA | IW_ENC_CAPA_WPA2 |
                IW_ENC_CAPA_CIPHER_TKIP | IW_ENC_CAPA_CIPHER_CCMP;
 
+       if (local->sta_fw_ver >= PRISM2_FW_VER(1,3,1))
+               range->scan_capa = IW_SCAN_CAPA_ESSID;
+
        return 0;
 }
 

diff --git a/drivers/net/wireless/ipw2200.c b/drivers/net/wireless/ipw2200.c
index 003f73f..be31304 100644 (file)
--- a/drivers/net/wireless/ipw2200.c
+++ b/drivers/net/wireless/ipw2200.c
@@ -8912,6 +8912,8 @@ static int ipw_wx_get_range(struct net_device *dev,
        range->enc_capa = IW_ENC_CAPA_WPA | IW_ENC_CAPA_WPA2 |
                IW_ENC_CAPA_CIPHER_TKIP | IW_ENC_CAPA_CIPHER_CCMP;
 
+       range->scan_capa = IW_SCAN_CAPA_ESSID | IW_SCAN_CAPA_TYPE;
+
        IPW_DEBUG_WX("GET Range\n");
        return 0;
 }

diff --git a/include/linux/wireless.h b/include/linux/wireless.h
index 0987aa7..74e84ca 100644 (file)
--- a/include/linux/wireless.h
+++ b/include/linux/wireless.h
@@ -541,6 +541,16 @@
 /* Maximum size of returned data */
 #define IW_SCAN_MAX_DATA       4096    /* In bytes */
 
+/* Scan capability flags - in (struct iw_range *)->scan_capa */
+#define IW_SCAN_CAPA_NONE              0x00
+#define IW_SCAN_CAPA_ESSID             0x01
+#define IW_SCAN_CAPA_BSSID             0x02
+#define IW_SCAN_CAPA_CHANNEL   0x04
+#define IW_SCAN_CAPA_MODE              0x08
+#define IW_SCAN_CAPA_RATE              0x10
+#define IW_SCAN_CAPA_TYPE              0x20
+#define IW_SCAN_CAPA_TIME              0x40
+
 /* Max number of char in custom event - use multiple of them if needed */
 #define IW_CUSTOM_MAX          256     /* In bytes */
 
@@ -963,6 +973,9 @@ struct      iw_range
        __u16           old_num_channels;
        __u8            old_num_frequency;
 
+       /* Scan capabilities */
+       __u8            scan_capa;      /* IW_SCAN_CAPA_* bit field */
+
        /* Wireless event capability bitmasks */
        __u32           event_capa[6];
 

diff --git a/net/mac80211/ieee80211_ioctl.c b/net/mac80211/ieee80211_ioctl.c
index 161f3bd..04ddce7 100644 (file)
--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -218,6 +218,8 @@ static int ieee80211_ioctl_giwrange(struct net_device *dev,
        IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWAP);
        IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWSCAN);
 
+       range->scan_capa |= IW_SCAN_CAPA_ESSID;
+
        return 0;
 }