mac80211: Add support for BSS max idle period element

Parse the BSS max idle period element and set the BSS configuration
accordingly so the driver can use this information to configure the
max idle period and to use protected management frames for keep alive
when required.

The BSS max idle period element is defined in IEEE802.11-2016,
section 9.4.2.79

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 4a5414481b78..bfc28053639b 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -828,6 +828,7 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
                 case WLAN_EID_EXT_CAPABILITY:
                 case WLAN_EID_CHAN_SWITCH_TIMING:
                 case WLAN_EID_LINK_ID:
+                case WLAN_EID_BSS_MAX_IDLE_PERIOD:
                 /*
                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
                  * that if the content gets bigger it might be needed more than once
@@ -1089,6 +1090,10 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
                         else
                                 elem_parse_failed = true;
                         break;
+                case WLAN_EID_BSS_MAX_IDLE_PERIOD:
+                        if (elen >= sizeof(*elems->max_idle_period_ie))
+                                elems->max_idle_period_ie = (void *)pos;
+                        break;
                 default:
                         break;
                 }
@@ -1983,6 +1988,10 @@ int ieee80211_reconfig(struct ieee80211_local *local)
                         if (sdata->u.mgd.have_beacon)
                                 changed |= BSS_CHANGED_BEACON_INFO;
 
+                        if (sdata->vif.bss_conf.max_idle_period ||
+                            sdata->vif.bss_conf.protected_keep_alive)
+                                changed |= BSS_CHANGED_KEEP_ALIVE;
+
                         sdata_lock(sdata);
                         ieee80211_bss_info_change_notify(sdata, changed);
                         sdata_unlock(sdata);