cfg80211: Add support to notify station's opmode change to userspace

ht/vht action frames will be sent to AP from station to notify
change of its ht/vht opmode(max bandwidth, smps mode or nss) modified
values. Currently these valuse used by driver/firmware for rate control
algorithm. This patch introduces NL80211_CMD_STA_OPMODE_CHANGED
command to notify those modified/current supported values(max bandwidth,
smps mode, max nss) to userspace application. This will be useful for the
application like steering, which closely monitoring station's capability
changes. Since the application has taken these values during station
association.

Signed-off-by: Tamizh chelvam <tamizhr@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index bdb70fe74e3c..cc6ec5bab676 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -14950,6 +14950,61 @@ nl80211_radar_notify(struct cfg80211_registered_device *rdev,
         nlmsg_free(msg);
 }
 
+void cfg80211_sta_opmode_change_notify(struct net_device *dev, const u8 *mac,
+                                       struct sta_opmode_info *sta_opmode,
+                                       gfp_t gfp)
+{
+        struct sk_buff *msg;
+        struct wireless_dev *wdev = dev->ieee80211_ptr;
+        struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
+        void *hdr;
+
+        if (WARN_ON(!mac))
+                return;
+
+        msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
+        if (!msg)
+                return;
+
+        hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_STA_OPMODE_CHANGED);
+        if (!hdr) {
+                nlmsg_free(msg);
+                return;
+        }
+
+        if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx))
+                goto nla_put_failure;
+
+        if (nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex))
+                goto nla_put_failure;
+
+        if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, mac))
+                goto nla_put_failure;
+
+        if ((sta_opmode->changed & STA_OPMODE_SMPS_MODE_CHANGED) &&
+            nla_put_u8(msg, NL80211_ATTR_SMPS_MODE, sta_opmode->smps_mode))
+                goto nla_put_failure;
+
+        if ((sta_opmode->changed & STA_OPMODE_MAX_BW_CHANGED) &&
+            nla_put_u8(msg, NL80211_ATTR_CHANNEL_WIDTH, sta_opmode->bw))
+                goto nla_put_failure;
+
+        if ((sta_opmode->changed & STA_OPMODE_N_SS_CHANGED) &&
+            nla_put_u8(msg, NL80211_ATTR_NSS, sta_opmode->rx_nss))
+                goto nla_put_failure;
+
+        genlmsg_end(msg, hdr);
+
+        genlmsg_multicast_netns(&nl80211_fam, wiphy_net(&rdev->wiphy), msg, 0,
+                                NL80211_MCGRP_MLME, gfp);
+
+        return;
+
+nla_put_failure:
+        nlmsg_free(msg);
+}
+EXPORT_SYMBOL(cfg80211_sta_opmode_change_notify);
+
 void cfg80211_probe_status(struct net_device *dev, const u8 *addr,
                            u64 cookie, bool acked, gfp_t gfp)
 {