cfg80211: allow userspace to specify client P2P PS support

Legacy clients don't support P2P power save mechanisms, and thus
if a P2P GO has a legacy client connected to it, it has to make
some changes in the PS behavior.

To handle this, add an attribute to specify whether a station supports
P2P PS or not. If the attribute was not specified cfg80211 will assume
that station supports it for P2P GO interface, and does NOT support it
for AP interface, matching the current assumptions in the code.

Signed-off-by: Ayala Beker <ayala.beker@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 4ece4f961f4056f178e71a79f85fd7b2c07526a8..568c10f6d564da4205f720816b073e94b8380a66 100644 (file)
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -816,6 +816,7 @@ enum station_parameters_apply_mask {
  * @supported_oper_classes_len: number of supported operating classes
  * @opmode_notif: operating mode field from Operating Mode Notification
  * @opmode_notif_used: information if operating mode field is used
+ * @support_p2p_ps: information if station supports P2P PS mechanism
  */
 struct station_parameters {
        const u8 *supported_rates;
@@ -841,6 +842,7 @@ struct station_parameters {
        u8 supported_oper_classes_len;
        u8 opmode_notif;
        bool opmode_notif_used;
+       int support_p2p_ps;
 };
 
 /**

diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index b2a8d8c84a572ead0f1c3d90585e79875b7eecc6..6da52d7b48c47a7cc7d7f48cda687a0f2479598c 100644 (file)
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -1804,6 +1804,9 @@ enum nl80211_commands {
  *     it contains the behaviour-specific attribute containing the parameters for
  *     BSS selection to be done by driver and/or firmware.
  *
+ * @NL80211_ATTR_STA_SUPPORT_P2P_PS: whether P2P PS mechanism supported
+ *     or not. u8, one of the values of &enum nl80211_sta_p2p_ps_status
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2182,6 +2185,8 @@ enum nl80211_attrs {
 
        NL80211_ATTR_BSS_SELECT,
 
+       NL80211_ATTR_STA_SUPPORT_P2P_PS,
+
        /* add attributes here, update the policy in nl80211.c */
 
        __NL80211_ATTR_AFTER_LAST,
@@ -2325,6 +2330,20 @@ enum nl80211_sta_flags {
        NL80211_STA_FLAG_MAX = __NL80211_STA_FLAG_AFTER_LAST - 1
 };
 
+/**
+ * enum nl80211_sta_p2p_ps_status - station support of P2P PS
+ *
+ * @NL80211_P2P_PS_UNSUPPORTED: station doesn't support P2P PS mechanism
+ * @@NL80211_P2P_PS_SUPPORTED: station supports P2P PS mechanism
+ * @NUM_NL80211_P2P_PS_STATUS: number of values
+ */
+enum nl80211_sta_p2p_ps_status {
+       NL80211_P2P_PS_UNSUPPORTED = 0,
+       NL80211_P2P_PS_SUPPORTED,
+
+       NUM_NL80211_P2P_PS_STATUS,
+};
+
 #define NL80211_STA_FLAG_MAX_OLD_API   NL80211_STA_FLAG_TDLS_PEER
 
 /**

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index d6c6449c03893e56c643168e0a9d364f578c9985..824569b1c5a1bb6d7b89dce13ad1600df3111463 100644 (file)
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -403,6 +403,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
        [NL80211_ATTR_REG_INDOOR] = { .type = NLA_FLAG },
        [NL80211_ATTR_PBSS] = { .type = NLA_FLAG },
        [NL80211_ATTR_BSS_SELECT] = { .type = NLA_NESTED },
+       [NL80211_ATTR_STA_SUPPORT_P2P_PS] = { .type = NLA_U8 },
 };
 
 /* policy for the key attributes */
@@ -4006,6 +4007,10 @@ int cfg80211_check_station_change(struct wiphy *wiphy,
            statype != CFG80211_STA_AP_CLIENT_UNASSOC)
                return -EINVAL;
 
+       if (params->support_p2p_ps != -1 &&
+           statype != CFG80211_STA_AP_CLIENT_UNASSOC)
+               return -EINVAL;
+
        if (params->aid &&
            !(params->sta_flags_set & BIT(NL80211_STA_FLAG_TDLS_PEER)) &&
            statype != CFG80211_STA_AP_CLIENT_UNASSOC)
@@ -4299,6 +4304,18 @@ static int nl80211_set_station(struct sk_buff *skb, struct genl_info *info)
        else
                params.listen_interval = -1;
 
+       if (info->attrs[NL80211_ATTR_STA_SUPPORT_P2P_PS]) {
+               u8 tmp;
+
+               tmp = nla_get_u8(info->attrs[NL80211_ATTR_STA_SUPPORT_P2P_PS]);
+               if (tmp >= NUM_NL80211_P2P_PS_STATUS)
+                       return -EINVAL;
+
+               params.support_p2p_ps = tmp;
+       } else {
+               params.support_p2p_ps = -1;
+       }
+
        if (!info->attrs[NL80211_ATTR_MAC])
                return -EINVAL;
 
@@ -4422,6 +4439,23 @@ static int nl80211_new_station(struct sk_buff *skb, struct genl_info *info)
        params.listen_interval =
                nla_get_u16(info->attrs[NL80211_ATTR_STA_LISTEN_INTERVAL]);
 
+       if (info->attrs[NL80211_ATTR_STA_SUPPORT_P2P_PS]) {
+               u8 tmp;
+
+               tmp = nla_get_u8(info->attrs[NL80211_ATTR_STA_SUPPORT_P2P_PS]);
+               if (tmp >= NUM_NL80211_P2P_PS_STATUS)
+                       return -EINVAL;
+
+               params.support_p2p_ps = tmp;
+       } else {
+               /*
+                * if not specified, assume it's supported for P2P GO interface,
+                * and is NOT supported for AP interface
+                */
+               params.support_p2p_ps =
+                       dev->ieee80211_ptr->iftype == NL80211_IFTYPE_P2P_GO;
+       }
+
        if (info->attrs[NL80211_ATTR_PEER_AID])
                params.aid = nla_get_u16(info->attrs[NL80211_ATTR_PEER_AID]);
        else