9588bbd552
Add new commands for requesting the driver to remain awake on a specified channel for the specified amount of time (and another command to cancel such an operation). This can be used to implement userspace-controlled off-channel operations, like Public Action frame exchange on another channel than the operation channel. The off-channel operation should behave similarly to scan, i.e. the local station (if associated) moves into power save mode to request the AP to buffer frames for it and then moves to the other channel to allow the off-channel operation to be completed. The duration parameter can be used to request enough time to receive a response from the target station. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
/*
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* This file contains helper code to handle channel
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* settings and keeping track of what is possible at
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* any point in time.
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*
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <net/cfg80211.h>
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#include "core.h"
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struct ieee80211_channel *
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rdev_fixed_channel(struct cfg80211_registered_device *rdev,
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struct wireless_dev *for_wdev)
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{
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struct wireless_dev *wdev;
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struct ieee80211_channel *result = NULL;
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WARN_ON(!mutex_is_locked(&rdev->devlist_mtx));
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list_for_each_entry(wdev, &rdev->netdev_list, list) {
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if (wdev == for_wdev)
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continue;
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/*
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* Lock manually to tell lockdep about allowed
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* nesting here if for_wdev->mtx is held already.
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* This is ok as it's all under the rdev devlist
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* mutex and as such can only be done once at any
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* given time.
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*/
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mutex_lock_nested(&wdev->mtx, SINGLE_DEPTH_NESTING);
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if (wdev->current_bss)
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result = wdev->current_bss->pub.channel;
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wdev_unlock(wdev);
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if (result)
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break;
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}
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return result;
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}
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struct ieee80211_channel *
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rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
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int freq, enum nl80211_channel_type channel_type)
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{
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struct ieee80211_channel *chan;
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struct ieee80211_sta_ht_cap *ht_cap;
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chan = ieee80211_get_channel(&rdev->wiphy, freq);
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/* Primary channel not allowed */
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if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
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return NULL;
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if (channel_type == NL80211_CHAN_HT40MINUS &&
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chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
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return NULL;
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else if (channel_type == NL80211_CHAN_HT40PLUS &&
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chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
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return NULL;
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ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap;
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if (channel_type != NL80211_CHAN_NO_HT) {
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if (!ht_cap->ht_supported)
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return NULL;
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if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
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ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
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return NULL;
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}
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return chan;
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}
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int rdev_set_freq(struct cfg80211_registered_device *rdev,
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struct wireless_dev *for_wdev,
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int freq, enum nl80211_channel_type channel_type)
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{
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struct ieee80211_channel *chan;
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int result;
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if (rdev_fixed_channel(rdev, for_wdev))
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return -EBUSY;
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if (!rdev->ops->set_channel)
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return -EOPNOTSUPP;
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chan = rdev_freq_to_chan(rdev, freq, channel_type);
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if (!chan)
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return -EINVAL;
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result = rdev->ops->set_channel(&rdev->wiphy, chan, channel_type);
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if (result)
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return result;
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rdev->channel = chan;
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return 0;
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}
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