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   1 From 4b08d1b6a994dbb593557bd2095ba4f0c3c47819 Mon Sep 17 00:00:00 2001
   2 From: Johannes Berg <johannes.berg@intel.com>
   3 Date: Fri, 30 Aug 2019 14:24:51 +0300
   4 Subject: [PATCH] mac80211: IBSS: send deauth when expiring inactive STAs
   5
   6 When we expire an inactive station, try to send it a deauth. This
   7 helps if it's actually still around, and just has issues with
   8 beacon distribution (or we do), and it will not also remove us.
   9 Then, if we have shared state, this may not be reset properly,
  10 causing problems; for example, we saw a case where aggregation
  11 sessions weren't removed properly (due to the TX start being
  12 offloaded to firmware and it relying on deauth for stop), causing
  13 a lot of traffic to get lost due to the SN reset after remove/add
  14 of the peer.
  15
  16 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  17 Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
  18 Link: https://lore.kernel.org/r/20190830112451.21655-9-luca@coelho.fi
  19 Signed-off-by: Johannes Berg <johannes.berg@intel.com>
  20 ---
  21  net/mac80211/ibss.c        |  8 ++++++++
  22  net/mac80211/ieee80211_i.h |  3 ++-
  23  net/mac80211/mlme.c        | 11 ++++++-----
  24  net/mac80211/util.c        |  5 +++--
  25  4 files changed, 19 insertions(+), 8 deletions(-)
  26
  27 --- a/net/mac80211/ibss.c
  28 +++ b/net/mac80211/ibss.c
  29 @@ -1253,6 +1253,7 @@ void ieee80211_ibss_rx_no_sta(struct iee
  30
  31  static void ieee80211_ibss_sta_expire(struct ieee80211_sub_if_data *sdata)
  32  {
  33 +       struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
  34         struct ieee80211_local *local = sdata->local;
  35         struct sta_info *sta, *tmp;
  36         unsigned long exp_time = IEEE80211_IBSS_INACTIVITY_LIMIT;
  37 @@ -1269,10 +1270,17 @@ static void ieee80211_ibss_sta_expire(st
  38                 if (time_is_before_jiffies(last_active + exp_time) ||
  39                     (time_is_before_jiffies(last_active + exp_rsn) &&
  40                      sta->sta_state != IEEE80211_STA_AUTHORIZED)) {
  41 +                       u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
  42 +
  43                         sta_dbg(sta->sdata, "expiring inactive %sSTA %pM\n",
  44                                 sta->sta_state != IEEE80211_STA_AUTHORIZED ?
  45                                 "not authorized " : "", sta->sta.addr);
  46
  47 +                       ieee80211_send_deauth_disassoc(sdata, sta->sta.addr,
  48 +                                                      ifibss->bssid,
  49 +                                                      IEEE80211_STYPE_DEAUTH,
  50 +                                                      WLAN_REASON_DEAUTH_LEAVING,
  51 +                                                      true, frame_buf);
  52                         WARN_ON(__sta_info_destroy(sta));
  53                 }
  54         }
  55 --- a/net/mac80211/ieee80211_i.h
  56 +++ b/net/mac80211/ieee80211_i.h
  57 @@ -2069,7 +2069,8 @@ void ieee80211_send_auth(struct ieee8021
  58                          const u8 *da, const u8 *key, u8 key_len, u8 key_idx,
  59                          u32 tx_flags);
  60  void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
  61 -                                   const u8 *bssid, u16 stype, u16 reason,
  62 +                                   const u8 *da, const u8 *bssid,
  63 +                                   u16 stype, u16 reason,
  64                                     bool send_frame, u8 *frame_buf);
  65
  66  enum {
  67 --- a/net/mac80211/mlme.c
  68 +++ b/net/mac80211/mlme.c
  69 @@ -2203,8 +2203,9 @@ static void ieee80211_set_disassoc(struc
  70                     !ifmgd->have_beacon)
  71                         drv_mgd_prepare_tx(sdata->local, sdata, 0);
  72
  73 -               ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
  74 -                                              reason, tx, frame_buf);
  75 +               ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid,
  76 +                                              ifmgd->bssid, stype, reason,
  77 +                                              tx, frame_buf);
  78         }
  79
  80         /* flush out frame - make sure the deauth was actually sent */
  81 @@ -4369,7 +4370,7 @@ void ieee80211_mgd_quiesce(struct ieee80
  82                  * cfg80211 won't know and won't actually abort those attempts,
  83                  * thus we need to do that ourselves.
  84                  */
  85 -               ieee80211_send_deauth_disassoc(sdata, bssid,
  86 +               ieee80211_send_deauth_disassoc(sdata, bssid, bssid,
  87                                                IEEE80211_STYPE_DEAUTH,
  88                                                WLAN_REASON_DEAUTH_LEAVING,
  89                                                false, frame_buf);
  90 @@ -5349,7 +5350,7 @@ int ieee80211_mgd_deauth(struct ieee8021
  91                            ieee80211_get_reason_code_string(req->reason_code));
  92
  93                 drv_mgd_prepare_tx(sdata->local, sdata, 0);
  94 -               ieee80211_send_deauth_disassoc(sdata, req->bssid,
  95 +               ieee80211_send_deauth_disassoc(sdata, req->bssid, req->bssid,
  96                                                IEEE80211_STYPE_DEAUTH,
  97                                                req->reason_code, tx,
  98                                                frame_buf);
  99 @@ -5369,7 +5370,7 @@ int ieee80211_mgd_deauth(struct ieee8021
 100                            ieee80211_get_reason_code_string(req->reason_code));
 101
 102                 drv_mgd_prepare_tx(sdata->local, sdata, 0);
 103 -               ieee80211_send_deauth_disassoc(sdata, req->bssid,
 104 +               ieee80211_send_deauth_disassoc(sdata, req->bssid, req->bssid,
 105                                                IEEE80211_STYPE_DEAUTH,
 106                                                req->reason_code, tx,
 107                                                frame_buf);
 108 --- a/net/mac80211/util.c
 109 +++ b/net/mac80211/util.c
 110 @@ -1433,7 +1433,8 @@ void ieee80211_send_auth(struct ieee8021
 111  }
 112
 113  void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
 114 -                                   const u8 *bssid, u16 stype, u16 reason,
 115 +                                   const u8 *da, const u8 *bssid,
 116 +                                   u16 stype, u16 reason,
 117                                     bool send_frame, u8 *frame_buf)
 118  {
 119         struct ieee80211_local *local = sdata->local;
 120 @@ -1444,7 +1445,7 @@ void ieee80211_send_deauth_disassoc(stru
 121         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
 122         mgmt->duration = 0; /* initialize only */
 123         mgmt->seq_ctrl = 0; /* initialize only */
 124 -       memcpy(mgmt->da, bssid, ETH_ALEN);
 125 +       memcpy(mgmt->da, da, ETH_ALEN);
 126         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
 127         memcpy(mgmt->bssid, bssid, ETH_ALEN);
 128         /* u.deauth.reason_code == u.disassoc.reason_code */