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cfg80211: introduce TDLS channel switch commands

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Introduce commands to initiate and cancel TDLS channel-switching. Once
TDLS channel-switching is started, the lower level driver is responsible
for continually initiating channel-switch operations and returning to
the base (AP) channel to listen for beacons from time to time.

Upon cancellation of the channel-switch all communication between the
relevant TDLS peers will continue on the base channel.

Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arik Nemtsov
2014-11-19 12:54:26 +02:00
committed by Johannes Berg
parent c273390569
commit 1057d35ede
6 changed files with 211 additions and 0 deletions
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108
net/wireless/nl80211.c
View File

@@ -9658,6 +9658,98 @@ static int nl80211_del_tx_ts(struct sk_buff *skb, struct genl_info *info)
return err;
}
static int nl80211_tdls_channel_switch(struct sk_buff *skb,
struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct net_device *dev = info->user_ptr[1];
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_chan_def chandef = {};
const u8 *addr;
u8 oper_class;
int err;
if (!rdev->ops->tdls_channel_switch ||
!(rdev->wiphy.features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
return -EOPNOTSUPP;
switch (dev->ieee80211_ptr->iftype) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
break;
default:
return -EOPNOTSUPP;
}
if (!info->attrs[NL80211_ATTR_MAC] ||
!info->attrs[NL80211_ATTR_OPER_CLASS])
return -EINVAL;
err = nl80211_parse_chandef(rdev, info, &chandef);
if (err)
return err;
/*
* Don't allow wide channels on the 2.4Ghz band, as per IEEE802.11-2012
* section 10.22.6.2.1. Disallow 5/10Mhz channels as well for now, the
* specification is not defined for them.
*/
if (chandef.chan->band == IEEE80211_BAND_2GHZ &&
chandef.width != NL80211_CHAN_WIDTH_20_NOHT &&
chandef.width != NL80211_CHAN_WIDTH_20)
return -EINVAL;
/* we will be active on the TDLS link */
if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef, wdev->iftype))
return -EINVAL;
/* don't allow switching to DFS channels */
if (cfg80211_chandef_dfs_required(wdev->wiphy, &chandef, wdev->iftype))
return -EINVAL;
addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
oper_class = nla_get_u8(info->attrs[NL80211_ATTR_OPER_CLASS]);
wdev_lock(wdev);
err = rdev_tdls_channel_switch(rdev, dev, addr, oper_class, &chandef);
wdev_unlock(wdev);
return err;
}
static int nl80211_tdls_cancel_channel_switch(struct sk_buff *skb,
struct genl_info *info)
{
struct cfg80211_registered_device *rdev = info->user_ptr[0];
struct net_device *dev = info->user_ptr[1];
struct wireless_dev *wdev = dev->ieee80211_ptr;
const u8 *addr;
if (!rdev->ops->tdls_channel_switch ||
!rdev->ops->tdls_cancel_channel_switch ||
!(rdev->wiphy.features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH))
return -EOPNOTSUPP;
switch (dev->ieee80211_ptr->iftype) {
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
break;
default:
return -EOPNOTSUPP;
}
if (!info->attrs[NL80211_ATTR_MAC])
return -EINVAL;
addr = nla_data(info->attrs[NL80211_ATTR_MAC]);
wdev_lock(wdev);
rdev_tdls_cancel_channel_switch(rdev, dev, addr);
wdev_unlock(wdev);
return 0;
}
#define NL80211_FLAG_NEED_WIPHY 0x01
#define NL80211_FLAG_NEED_NETDEV 0x02
#define NL80211_FLAG_NEED_RTNL 0x04
@@ -10456,6 +10548,22 @@ static const struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
{
.cmd = NL80211_CMD_TDLS_CHANNEL_SWITCH,
.doit = nl80211_tdls_channel_switch,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
{
.cmd = NL80211_CMD_TDLS_CANCEL_CHANNEL_SWITCH,
.doit = nl80211_tdls_cancel_channel_switch,
.policy = nl80211_policy,
.flags = GENL_ADMIN_PERM,
.internal_flags = NL80211_FLAG_NEED_NETDEV_UP |
NL80211_FLAG_NEED_RTNL,
},
};
/* notification functions */