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mac80211: split 802.11h parsing from transmit power policy

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Decouple the logic of parsing the 802.11d and 802.11h IEs from the
part of deciding what to do about the data (messaging, clamping to
0 dBm, doing the actual setting). This paves the way for the next
patch, which introduces more data sources for transmit power limitation.

Signed-off-by: Steinar H. Gunderson <sgunderson@bigfoot.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Steinar H. Gunderson 2014-09-03 06:22:10 -07:00 committed by Johannes Berg
parent f3000e1b43
commit 24a4e4008c
1 changed files with 41 additions and 19 deletions
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60
net/mac80211/mlme.c
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@ -1171,19 +1171,21 @@ ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
}
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *channel,
const u8 *country_ie, u8 country_ie_len,
const u8 *pwr_constr_elem)
static bool
ieee80211_find_80211h_pwr_constr(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *channel,
const u8 *country_ie, u8 country_ie_len,
const u8 *pwr_constr_elem,
int *chan_pwr, int *pwr_reduction)
{
struct ieee80211_country_ie_triplet *triplet;
int chan = ieee80211_frequency_to_channel(channel->center_freq);
int i, chan_pwr, chan_increment, new_ap_level;
int i, chan_increment;
bool have_chan_pwr = false;
/* Invalid IE */
if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
return 0;
return false;
triplet = (void *)(country_ie + 3);
country_ie_len -= 3;
@ -1211,7 +1213,7 @@ static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
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;
*chan_pwr = triplet->chans.max_power;
break;
}
}
@ -1223,18 +1225,41 @@ static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
country_ie_len -= 3;
}
if (!have_chan_pwr)
return 0;
if (have_chan_pwr)
*pwr_reduction = *pwr_constr_elem;
return have_chan_pwr;
}
new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *channel,
struct ieee80211_mgmt *mgmt,
const u8 *country_ie, u8 country_ie_len,
const u8 *pwr_constr_ie)
{
bool has_80211h_pwr = false;
int chan_pwr, pwr_reduction_80211h;
int new_ap_level;
if (sdata->ap_power_level == new_ap_level)
if (country_ie && pwr_constr_ie &&
mgmt->u.probe_resp.capab_info &
cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT)) {
has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
sdata, channel, country_ie, country_ie_len,
pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
new_ap_level = max_t(int, 0, chan_pwr - pwr_reduction_80211h);
}
if (!has_80211h_pwr)
return 0;
sdata_info(sdata,
"Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
new_ap_level, chan_pwr, *pwr_constr_elem,
new_ap_level, chan_pwr, pwr_reduction_80211h,
sdata->u.mgd.bssid);
if (sdata->ap_power_level == new_ap_level)
return 0;
sdata->ap_power_level = new_ap_level;
if (__ieee80211_recalc_txpower(sdata))
return BSS_CHANGED_TXPOWER;
@ -3204,13 +3229,10 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
rx_status->band, true);
mutex_unlock(&local->sta_mtx);
if (elems.country_elem && elems.pwr_constr_elem &&
mgmt->u.probe_resp.capab_info &
cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
changed |= ieee80211_handle_pwr_constr(sdata, chan,
elems.country_elem,
elems.country_elem_len,
elems.pwr_constr_elem);
changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
elems.country_elem,
elems.country_elem_len,
elems.pwr_constr_elem);
ieee80211_bss_info_change_notify(sdata, changed);
}