{nl,cfg}80211: add a flags word to scan requests

Add a flags word to direct and scheduled scan requests; it will
be used for control of optional behaviours such as flushing the
bss cache prior to doing a scan.

Signed-off-by: Sam Leffler <sleffler@chromium.org>
Tested-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 607b5c0..d95da8f 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1002,6 +1002,7 @@ struct cfg80211_ssid {
  * @n_channels: total number of channels to scan
  * @ie: optional information element(s) to add into Probe Request or %NULL
  * @ie_len: length of ie in octets
+ * @flags: bit field of flags controlling operation
  * @rates: bitmap of rates to advertise for each band
  * @wiphy: the wiphy this was for
  * @wdev: the wireless device to scan for
@@ -1014,6 +1015,7 @@ struct cfg80211_scan_request {
        u32 n_channels;
        const u8 *ie;
        size_t ie_len;
+       u32 flags;
 
        u32 rates[IEEE80211_NUM_BANDS];
 
@@ -1046,6 +1048,7 @@ struct cfg80211_match_set {
  * @interval: interval between each scheduled scan cycle
  * @ie: optional information element(s) to add into Probe Request or %NULL
  * @ie_len: length of ie in octets
+ * @flags: bit field of flags controlling operation
  * @match_sets: sets of parameters to be matched for a scan result
  *     entry to be considered valid and to be passed to the host
  *     (others are filtered out).
@@ -1063,6 +1066,7 @@ struct cfg80211_sched_scan_request {
        u32 interval;
        const u8 *ie;
        size_t ie_len;
+       u32 flags;
        struct cfg80211_match_set *match_sets;
        int n_match_sets;
        s32 rssi_thold;

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 71ab23b..4d0b49e 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1279,6 +1279,8 @@ enum nl80211_commands {
  * @NL80211_ATTR_VHT_CAPABILITY: VHT Capability information element (from
  *     association request when used with NL80211_CMD_NEW_STATION)
  *
+ * @NL80211_ATTR_SCAN_FLAGS: scan request control flags (u32)
+ *
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
  */
@@ -1540,6 +1542,8 @@ enum nl80211_attrs {
 
        NL80211_ATTR_VHT_CAPABILITY,
 
+       NL80211_ATTR_SCAN_FLAGS,
+
        /* add attributes here, update the policy in nl80211.c */
 
        __NL80211_ATTR_AFTER_LAST,
@@ -3086,4 +3090,15 @@ enum nl80211_connect_failed_reason {
        NL80211_CONN_FAIL_BLOCKED_CLIENT,
 };
 
+/**
+ * enum nl80211_scan_flags -  scan request control flags
+ *
+ * Scan request control flags are used to control the handling
+ * of NL80211_CMD_TRIGGER_SCAN and NL80211_CMD_START_SCHED_SCAN
+ * requests.
+ * (will be filled)
+enum nl80211_scan_flags {
+};
+ */
+
 #endif /* __LINUX_NL80211_H */

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index ef170e9..dc08211 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -356,6 +356,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
        [NL80211_ATTR_USER_REG_HINT_TYPE] = { .type = NLA_U32 },
        [NL80211_ATTR_SAE_DATA] = { .type = NLA_BINARY, },
        [NL80211_ATTR_VHT_CAPABILITY] = { .len = NL80211_VHT_CAPABILITY_LEN },
+       [NL80211_ATTR_SCAN_FLAGS] = { .type = NLA_U32 },
 };
 
 /* policy for the key attributes */
@@ -4367,6 +4368,10 @@ static int nl80211_trigger_scan(struct sk_buff *skb, struct genl_info *info)
                }
        }
 
+       if (info->attrs[NL80211_ATTR_SCAN_FLAGS])
+               request->flags = nla_get_u32(
+                       info->attrs[NL80211_ATTR_SCAN_FLAGS]);
+
        request->no_cck =
                nla_get_flag(info->attrs[NL80211_ATTR_TX_NO_CCK_RATE]);
 
@@ -4598,6 +4603,10 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
                       request->ie_len);
        }
 
+       if (info->attrs[NL80211_ATTR_SCAN_FLAGS])
+               request->flags = nla_get_u32(
+                       info->attrs[NL80211_ATTR_SCAN_FLAGS]);
+
        request->dev = dev;
        request->wiphy = &rdev->wiphy;
        request->interval = interval;
@@ -7663,6 +7672,9 @@ static int nl80211_add_scan_req(struct sk_buff *msg,
            nla_put(msg, NL80211_ATTR_IE, req->ie_len, req->ie))
                goto nla_put_failure;
 
+       if (req->flags)
+               nla_put_u32(msg, NL80211_ATTR_SCAN_FLAGS, req->flags);
+
        return 0;
  nla_put_failure:
        return -ENOBUFS;