mac80211: handle power constraint/country IE better

Currently, mac80211 uses the power constraint IE, and reduces
the regulatory max TX power by it. This can cause issues if
the AP is advertising a large power constraint value matching
a high TX power in its country IE, for example in this case:

...
Country: US  Environment: Indoor/Outdoor
    ...
    Channels [157 - 157] @ 30 dBm
    ...
Power constraint: 13 dB
...

What happened here is that our local regulatory TX power is
15 dBm, and gets reduced by 13 dB so we end up with only
2 dBm effective TX power, which is way too low.

Instead, handle the country IE/power constraint IE combined
and restrict our TX power to the max of the regulatory power
and the maximum power advertised by the AP, in this case
17 dBm (= 30 dBm - 13 dB).

Also print a message when this happens to let the user know
and help us debug issues with it.

Reported-by: Carl A. Cook <CACook@quantum-equities.com>
Tested-by: Carl A. Cook <CACook@quantum-equities.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index d11a6f8..8c80455 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1059,7 +1059,7 @@ struct ieee80211_local {
        bool disable_dynamic_ps;
 
        int user_power_level; /* in dBm */
-       int power_constr_level; /* in dBm */
+       int ap_power_level; /* in dBm */
 
        enum ieee80211_smps_mode smps_mode;
 

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index bd75293..416e85e 100644 (file)
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -150,13 +150,11 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 
        if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
            test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
-           test_bit(SCAN_HW_SCANNING, &local->scanning))
+           test_bit(SCAN_HW_SCANNING, &local->scanning) ||
+           !local->ap_power_level)
                power = chan->max_power;
        else
-               power = local->power_constr_level ?
-                       min(chan->max_power,
-                               (chan->max_reg_power  - local->power_constr_level)) :
-                       chan->max_power;
+               power = min(chan->max_power, local->ap_power_level);
 
        if (local->user_power_level >= 0)
                power = min(power, local->user_power_level);

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 0ca3413..45a9fa6 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -779,18 +779,71 @@ void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
 }
 
 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
-                                       u16 capab_info, u8 *pwr_constr_elem)
+                                       struct ieee80211_channel *channel,
+                                       const u8 *country_ie, u8 country_ie_len,
+                                       const u8 *pwr_constr_elem)
 {
-       struct ieee80211_conf *conf = &sdata->local->hw.conf;
+       struct ieee80211_country_ie_triplet *triplet;
+       int chan = ieee80211_frequency_to_channel(channel->center_freq);
+       int i, chan_pwr, chan_increment, new_ap_level;
+       bool have_chan_pwr = false;
 
-       if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
+       /* Invalid IE */
+       if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
                return;
 
-       if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
-           (*pwr_constr_elem != sdata->local->power_constr_level)) {
-               sdata->local->power_constr_level = *pwr_constr_elem;
-               ieee80211_hw_config(sdata->local, 0);
+       triplet = (void *)(country_ie + 3);
+       country_ie_len -= 3;
+
+       switch (channel->band) {
+       default:
+               WARN_ON_ONCE(1);
+               /* fall through */
+       case IEEE80211_BAND_2GHZ:
+       case IEEE80211_BAND_60GHZ:
+               chan_increment = 1;
+               break;
+       case IEEE80211_BAND_5GHZ:
+               chan_increment = 4;
+               break;
        }
+
+       /* find channel */
+       while (country_ie_len >= 3) {
+               u8 first_channel = triplet->chans.first_channel;
+
+               if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
+                       goto next;
+
+               for (i = 0; i < triplet->chans.num_channels; i++) {
+                       if (first_channel + i * chan_increment == chan) {
+                               have_chan_pwr = true;
+                               chan_pwr = triplet->chans.max_power;
+                               break;
+                       }
+               }
+               if (have_chan_pwr)
+                       break;
+
+ next:
+               triplet++;
+               country_ie_len -= 3;
+       }
+
+       if (!have_chan_pwr)
+               return;
+
+       new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
+
+       if (sdata->local->ap_power_level == new_ap_level)
+               return;
+
+       sdata_info(sdata,
+                  "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
+                  new_ap_level, chan_pwr, *pwr_constr_elem,
+                  sdata->u.mgd.bssid);
+       sdata->local->ap_power_level = new_ap_level;
+       ieee80211_hw_config(sdata->local, 0);
 }
 
 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
@@ -1394,7 +1447,7 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
        memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
        memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
 
-       local->power_constr_level = 0;
+       local->ap_power_level = 0;
 
        del_timer_sync(&local->dynamic_ps_timer);
        cancel_work_sync(&local->dynamic_ps_enable_work);
@@ -2499,14 +2552,13 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
                                                  bssid, true);
        }
 
-       /* Note: country IE parsing is done for us by cfg80211 */
-       if (elems.country_elem) {
-               /* TODO: IBSS also needs this */
-               if (elems.pwr_constr_elem)
-                       ieee80211_handle_pwr_constr(sdata,
-                               le16_to_cpu(mgmt->u.probe_resp.capab_info),
-                               elems.pwr_constr_elem);
-       }
+       if (elems.country_elem && elems.pwr_constr_elem &&
+           mgmt->u.probe_resp.capab_info &
+                               cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
+               ieee80211_handle_pwr_constr(sdata, local->oper_channel,
+                                           elems.country_elem,
+                                           elems.country_elem_len,
+                                           elems.pwr_constr_elem);
 
        ieee80211_bss_info_change_notify(sdata, changed);
 }