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mac80211: add supported channels IE during TDLS setup 

This information element is mandatory in case TDLS channel-switching is to
be supported. The channels given are ones supported and allowed to be
active in the current regulatory setting.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arik Nemtsov 2014-11-09 18:50:12 +02:00 committed by Johannes Berg
parent 7528ec5776
commit f0d29cb979
1 changed files with 71 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
net/mac80211/tdls.c
View File

@ -48,6 +48,75 @@ static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb)
*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
}
static u8
ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, u16 start, u16 end,
u16 spacing)
{
u8 subband_cnt = 0, ch_cnt = 0;
struct ieee80211_channel *ch;
struct cfg80211_chan_def chandef;
int i, subband_start;
for (i = start; i <= end; i += spacing) {
if (!ch_cnt)
subband_start = i;
ch = ieee80211_get_channel(sdata->local->hw.wiphy, i);
if (ch) {
/* we will be active on the channel */
u32 flags = IEEE80211_CHAN_DISABLED |
IEEE80211_CHAN_NO_IR;
cfg80211_chandef_create(&chandef, ch,
NL80211_CHAN_HT20);
if (cfg80211_chandef_usable(sdata->local->hw.wiphy,
&chandef, flags)) {
ch_cnt++;
continue;
}
}
if (ch_cnt) {
u8 *pos = skb_put(skb, 2);
*pos++ = ieee80211_frequency_to_channel(subband_start);
*pos++ = ch_cnt;
subband_cnt++;
ch_cnt = 0;
}
}
return subband_cnt;
}
static void
ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb)
{
/*
* Add possible channels for TDLS. These are channels that are allowed
* to be active.
*/
u8 subband_cnt;
u8 *pos = skb_put(skb, 2);
*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
/*
* 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as
* this doesn't happen in real world scenarios.
*/
/* 2GHz, with 5MHz spacing */
subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5);
/* 5GHz, with 20MHz spacing */
subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20);
/* length */
*pos = 2 * subband_cnt;
}
static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata,
u16 status_code)
{
@ -190,6 +259,7 @@ ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata,
ieee80211_add_srates_ie(sdata, skb, false, band);
ieee80211_add_ext_srates_ie(sdata, skb, false, band);
ieee80211_tdls_add_supp_channels(sdata, skb);
/* add any custom IEs that go before Extended Capabilities */
if (extra_ies_len) {
@ -526,6 +596,7 @@ ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev,
26 + /* max(WMM-info, WMM-param) */
2 + max(sizeof(struct ieee80211_ht_cap),
sizeof(struct ieee80211_ht_operation)) +
50 + /* supported channels */
extra_ies_len +
sizeof(struct ieee80211_tdls_lnkie));
if (!skb)