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cfg80211: use RTNL locked reg_can_beacon for IR-relaxation 

The RTNL is required to check for IR-relaxation conditions that allow
more channels to beacon. Export an RTNL locked version of reg_can_beacon
and use it where possible in AP/STA interface type flows, where
IR-relaxation may be applicable.

Fixes: 06f207fc54 ("cfg80211: change GO_CONCURRENT to IR_CONCURRENT for STA")
Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Arik Nemtsov 2015-07-08 15:41:44 +03:00 committed by Johannes Berg
parent b3e7de873d
commit 923b352f19
6 changed files with 70 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
include/net/cfg80211.h
View File

@ -4868,6 +4868,23 @@ bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype);
/**
* cfg80211_reg_can_beacon_relax - check if beaconing is allowed with relaxation
* @wiphy: the wiphy
* @chandef: the channel definition
* @iftype: interface type
*
* Return: %true if there is no secondary channel or the secondary channel(s)
* can be used for beaconing (i.e. is not a radar channel etc.). This version
* also checks if IR-relaxation conditions apply, to allow beaconing under
* more permissive conditions.
*
* Requires the RTNL to be held.
*/
bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype);
/*
* cfg80211_ch_switch_notify - update wdev channel and notify userspace
* @dev: the device which switched channels

6
net/mac80211/tdls.c
View File

@ -60,6 +60,7 @@ ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
struct ieee80211_channel *ch;
struct cfg80211_chan_def chandef;
int i, subband_start;
struct wiphy *wiphy = sdata->local->hw.wiphy;
for (i = start; i <= end; i += spacing) {
if (!ch_cnt)
@ -70,9 +71,8 @@ ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata,
/* we will be active on the channel */
cfg80211_chandef_create(&chandef, ch,
NL80211_CHAN_NO_HT);
if (cfg80211_reg_can_beacon(sdata->local->hw.wiphy,
&chandef,
sdata->wdev.iftype)) {
if (cfg80211_reg_can_beacon_relax(wiphy, &chandef,
sdata->wdev.iftype)) {
ch_cnt++;
/*
* check if the next channel is also part of

45
net/wireless/chan.c
View File

@ -797,23 +797,18 @@ static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
return false;
}
bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype)
static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype,
bool check_no_ir)
{
bool res;
u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
IEEE80211_CHAN_RADAR;
trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype);
trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
/*
* Under certain conditions suggested by some regulatory bodies a
* GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
* only if such relaxations are not enabled and the conditions are not
* met.
*/
if (!cfg80211_ir_permissive_chan(wiphy, iftype, chandef->chan))
if (check_no_ir)
prohibited_flags |= IEEE80211_CHAN_NO_IR;
if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
@ -827,8 +822,36 @@ bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
trace_cfg80211_return_bool(res);
return res;
}
bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype)
{
return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
}
EXPORT_SYMBOL(cfg80211_reg_can_beacon);
bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype)
{
bool check_no_ir;
ASSERT_RTNL();
/*
* Under certain conditions suggested by some regulatory bodies a
* GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
* only if such relaxations are not enabled and the conditions are not
* met.
*/
check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
chandef->chan);
return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
}
EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
struct cfg80211_chan_def *chandef)
{

14
net/wireless/nl80211.c
View File

@ -2003,7 +2003,8 @@ static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
switch (iftype) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef, iftype)) {
if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &chandef,
iftype)) {
result = -EINVAL;
break;
}
@ -3403,8 +3404,8 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
} else if (!nl80211_get_ap_channel(rdev, &params))
return -EINVAL;
if (!cfg80211_reg_can_beacon(&rdev->wiphy, &params.chandef,
wdev->iftype))
if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &params.chandef,
wdev->iftype))
return -EINVAL;
if (info->attrs[NL80211_ATTR_ACL_POLICY]) {
@ -6492,8 +6493,8 @@ static int nl80211_channel_switch(struct sk_buff *skb, struct genl_info *info)
if (err)
return err;
if (!cfg80211_reg_can_beacon(&rdev->wiphy, &params.chandef,
wdev->iftype))
if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &params.chandef,
wdev->iftype))
return -EINVAL;
err = cfg80211_chandef_dfs_required(wdev->wiphy,
@ -10170,7 +10171,8 @@ static int nl80211_tdls_channel_switch(struct sk_buff *skb,
return -EINVAL;
/* we will be active on the TDLS link */
if (!cfg80211_reg_can_beacon(&rdev->wiphy, &chandef, wdev->iftype))
if (!cfg80211_reg_can_beacon_relax(&rdev->wiphy, &chandef,
wdev->iftype))
return -EINVAL;
/* don't allow switching to DFS channels */

2
net/wireless/reg.c
View File

@ -1589,7 +1589,7 @@ static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_ADHOC:
return cfg80211_reg_can_beacon(wiphy, &chandef, iftype);
return cfg80211_reg_can_beacon_relax(wiphy, &chandef, iftype);
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
return cfg80211_chandef_usable(wiphy, &chandef,

11
net/wireless/trace.h
View File

@ -2358,20 +2358,23 @@ TRACE_EVENT(cfg80211_cqm_rssi_notify,
TRACE_EVENT(cfg80211_reg_can_beacon,
TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype),
TP_ARGS(wiphy, chandef, iftype),
enum nl80211_iftype iftype, bool check_no_ir),
TP_ARGS(wiphy, chandef, iftype, check_no_ir),
TP_STRUCT__entry(
WIPHY_ENTRY
CHAN_DEF_ENTRY
__field(enum nl80211_iftype, iftype)
__field(bool, check_no_ir)
),
TP_fast_assign(
WIPHY_ASSIGN;
CHAN_DEF_ASSIGN(chandef);
__entry->iftype = iftype;
__entry->check_no_ir = check_no_ir;
),
TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT ", iftype=%d",
WIPHY_PR_ARG, CHAN_DEF_PR_ARG, __entry->iftype)
TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT ", iftype=%d check_no_ir=%s",
WIPHY_PR_ARG, CHAN_DEF_PR_ARG, __entry->iftype,
BOOL_TO_STR(__entry->check_no_ir))
);
TRACE_EVENT(cfg80211_chandef_dfs_required,