mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 06:04:14 +08:00
09a02fdb91
This follows wireless-testing 9236d838c9
("cfg80211: fix extension channel checks to initiate communication") and
fixes accidental case fall-through. Without this fix, HT40 is entirely
blocked.
Signed-off-by: Mark Mentovai <mark@moxienet.com>
Cc: stable@kernel.org
Acked-by: Luis R. Rodriguez <lrodriguez@atheros.com
Signed-off-by: John W. Linville <linville@tuxdriver.com>
136 lines
3.1 KiB
C
136 lines
3.1 KiB
C
/*
|
|
* This file contains helper code to handle channel
|
|
* settings and keeping track of what is possible at
|
|
* any point in time.
|
|
*
|
|
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
|
|
*/
|
|
|
|
#include <net/cfg80211.h>
|
|
#include "core.h"
|
|
|
|
struct ieee80211_channel *
|
|
rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
|
|
int freq, enum nl80211_channel_type channel_type)
|
|
{
|
|
struct ieee80211_channel *chan;
|
|
struct ieee80211_sta_ht_cap *ht_cap;
|
|
|
|
chan = ieee80211_get_channel(&rdev->wiphy, freq);
|
|
|
|
/* Primary channel not allowed */
|
|
if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
|
|
return NULL;
|
|
|
|
if (channel_type == NL80211_CHAN_HT40MINUS &&
|
|
chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
|
|
return NULL;
|
|
else if (channel_type == NL80211_CHAN_HT40PLUS &&
|
|
chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
|
|
return NULL;
|
|
|
|
ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap;
|
|
|
|
if (channel_type != NL80211_CHAN_NO_HT) {
|
|
if (!ht_cap->ht_supported)
|
|
return NULL;
|
|
|
|
if (channel_type != NL80211_CHAN_HT20 &&
|
|
(!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
|
|
ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT))
|
|
return NULL;
|
|
}
|
|
|
|
return chan;
|
|
}
|
|
|
|
static bool can_beacon_sec_chan(struct wiphy *wiphy,
|
|
struct ieee80211_channel *chan,
|
|
enum nl80211_channel_type channel_type)
|
|
{
|
|
struct ieee80211_channel *sec_chan;
|
|
int diff;
|
|
|
|
switch (channel_type) {
|
|
case NL80211_CHAN_HT40PLUS:
|
|
diff = 20;
|
|
break;
|
|
case NL80211_CHAN_HT40MINUS:
|
|
diff = -20;
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
sec_chan = ieee80211_get_channel(wiphy, chan->center_freq + diff);
|
|
if (!sec_chan)
|
|
return false;
|
|
|
|
/* we'll need a DFS capability later */
|
|
if (sec_chan->flags & (IEEE80211_CHAN_DISABLED |
|
|
IEEE80211_CHAN_PASSIVE_SCAN |
|
|
IEEE80211_CHAN_NO_IBSS |
|
|
IEEE80211_CHAN_RADAR))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int cfg80211_set_freq(struct cfg80211_registered_device *rdev,
|
|
struct wireless_dev *wdev, int freq,
|
|
enum nl80211_channel_type channel_type)
|
|
{
|
|
struct ieee80211_channel *chan;
|
|
int result;
|
|
|
|
if (wdev && wdev->iftype == NL80211_IFTYPE_MONITOR)
|
|
wdev = NULL;
|
|
|
|
if (wdev) {
|
|
ASSERT_WDEV_LOCK(wdev);
|
|
|
|
if (!netif_running(wdev->netdev))
|
|
return -ENETDOWN;
|
|
}
|
|
|
|
if (!rdev->ops->set_channel)
|
|
return -EOPNOTSUPP;
|
|
|
|
chan = rdev_freq_to_chan(rdev, freq, channel_type);
|
|
if (!chan)
|
|
return -EINVAL;
|
|
|
|
/* Both channels should be able to initiate communication */
|
|
if (wdev && (wdev->iftype == NL80211_IFTYPE_ADHOC ||
|
|
wdev->iftype == NL80211_IFTYPE_AP ||
|
|
wdev->iftype == NL80211_IFTYPE_AP_VLAN ||
|
|
wdev->iftype == NL80211_IFTYPE_MESH_POINT ||
|
|
wdev->iftype == NL80211_IFTYPE_P2P_GO)) {
|
|
switch (channel_type) {
|
|
case NL80211_CHAN_HT40PLUS:
|
|
case NL80211_CHAN_HT40MINUS:
|
|
if (!can_beacon_sec_chan(&rdev->wiphy, chan,
|
|
channel_type)) {
|
|
printk(KERN_DEBUG
|
|
"cfg80211: Secondary channel not "
|
|
"allowed to initiate communication\n");
|
|
return -EINVAL;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
result = rdev->ops->set_channel(&rdev->wiphy,
|
|
wdev ? wdev->netdev : NULL,
|
|
chan, channel_type);
|
|
if (result)
|
|
return result;
|
|
|
|
if (wdev)
|
|
wdev->channel = chan;
|
|
|
|
return 0;
|
|
}
|