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cfg80211: rework chandef checking and export it

Browse source 
Some of the chandef checking that we do in cfg80211
to check if a channel is supported or not is also
needed in mac80211, so rework that a bit and export
the functions that are needed.

Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Johannes Berg 2012-11-22 16:59:45 +01:00
commit 9f5e8f6efc
4 changed files with 85 additions and 72 deletions
Download patch file Download diff file Expand all files Collapse all files

94
net/wireless/chan.c
View file

@ -44,7 +44,7 @@ void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
}
EXPORT_SYMBOL(cfg80211_chandef_create);
bool cfg80211_chan_def_valid(const struct cfg80211_chan_def *chandef)
bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
{
u32 control_freq;
@ -105,6 +105,7 @@ bool cfg80211_chan_def_valid(const struct cfg80211_chan_def *chandef)
return true;
}
EXPORT_SYMBOL(cfg80211_chandef_valid);
static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
int *pri40, int *pri80)
@ -187,9 +188,9 @@ cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
}
EXPORT_SYMBOL(cfg80211_chandef_compatible);
bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
u32 center_freq, u32 bandwidth,
u32 prohibited_flags)
static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
u32 center_freq, u32 bandwidth,
u32 prohibited_flags)
{
struct ieee80211_channel *c;
u32 freq;
@ -205,55 +206,88 @@ bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
return true;
}
static bool cfg80211_check_beacon_chans(struct wiphy *wiphy,
u32 center_freq, u32 bw)
bool cfg80211_chandef_usable(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef,
u32 prohibited_flags)
{
return cfg80211_secondary_chans_ok(wiphy, center_freq, bw,
IEEE80211_CHAN_DISABLED |
IEEE80211_CHAN_PASSIVE_SCAN |
IEEE80211_CHAN_NO_IBSS |
IEEE80211_CHAN_RADAR);
}
struct ieee80211_sta_ht_cap *ht_cap;
struct ieee80211_sta_vht_cap *vht_cap;
u32 width, control_freq;
bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef)
{
u32 width;
bool res;
trace_cfg80211_reg_can_beacon(wiphy, chandef);
if (WARN_ON(!cfg80211_chan_def_valid(chandef))) {
trace_cfg80211_return_bool(false);
if (WARN_ON(!cfg80211_chandef_valid(chandef)))
return false;
}
ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;
control_freq = chandef->chan->center_freq;
switch (chandef->width) {
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_20:
if (!ht_cap->ht_supported)
return false;
case NL80211_CHAN_WIDTH_20_NOHT:
width = 20;
break;
case NL80211_CHAN_WIDTH_40:
width = 40;
if (!ht_cap->ht_supported)
return false;
if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
return false;
if (chandef->center_freq1 < control_freq &&
chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
return false;
if (chandef->center_freq1 > control_freq &&
chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
return false;
break;
case NL80211_CHAN_WIDTH_80:
case NL80211_CHAN_WIDTH_80P80:
if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))
return false;
case NL80211_CHAN_WIDTH_80:
if (!vht_cap->vht_supported)
return false;
width = 80;
break;
case NL80211_CHAN_WIDTH_160:
if (!vht_cap->vht_supported)
return false;
if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ))
return false;
width = 160;
break;
default:
WARN_ON_ONCE(1);
trace_cfg80211_return_bool(false);
return false;
}
res = cfg80211_check_beacon_chans(wiphy, chandef->center_freq1, width);
/* TODO: missing regulatory check on 80/160 bandwidth */
if (res && chandef->center_freq2)
res = cfg80211_check_beacon_chans(wiphy, chandef->center_freq2,
width);
if (!cfg80211_secondary_chans_ok(wiphy, chandef->center_freq1,
width, prohibited_flags))
return false;
if (!chandef->center_freq2)
return true;
return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2,
width, prohibited_flags);
}
EXPORT_SYMBOL(cfg80211_chandef_usable);
bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef)
{
bool res;
trace_cfg80211_reg_can_beacon(wiphy, chandef);
res = cfg80211_chandef_usable(wiphy, chandef,
IEEE80211_CHAN_DISABLED |
IEEE80211_CHAN_PASSIVE_SCAN |
IEEE80211_CHAN_NO_IBSS |
IEEE80211_CHAN_RADAR);
trace_cfg80211_return_bool(res);
return res;

6
net/wireless/core.h
View file

@ -483,12 +483,6 @@ int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
void cfg80211_update_iface_num(struct cfg80211_registered_device *rdev,
enum nl80211_iftype iftype, int num);
bool cfg80211_chan_def_valid(const struct cfg80211_chan_def *chandef);
bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
u32 center_freq, u32 bandwidth,
u32 prohibited_flags);
#define CFG80211_MAX_NUM_DIFFERENT_CHANNELS 10
#ifdef CONFIG_CFG80211_DEVELOPER_WARNINGS

38
net/wireless/nl80211.c
View file

@ -1420,63 +1420,33 @@ static int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
ht_cap = &rdev->wiphy.bands[chandef->chan->band]->ht_cap;
vht_cap = &rdev->wiphy.bands[chandef->chan->band]->vht_cap;
if (!cfg80211_chan_def_valid(chandef))
if (!cfg80211_chandef_valid(chandef))
return -EINVAL;
switch (chandef->width) {
case NL80211_CHAN_WIDTH_20:
if (!ht_cap->ht_supported)
return -EINVAL;
case NL80211_CHAN_WIDTH_20_NOHT:
width = 20;
break;
case NL80211_CHAN_WIDTH_40:
width = 40;
/* quick early regulatory check */
if (chandef->center_freq1 < control_freq &&
chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
return -EINVAL;
if (chandef->center_freq1 > control_freq &&
chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
return -EINVAL;
if (!ht_cap->ht_supported)
return -EINVAL;
if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
return -EINVAL;
break;
case NL80211_CHAN_WIDTH_80:
width = 80;
if (!vht_cap->vht_supported)
return -EINVAL;
break;
case NL80211_CHAN_WIDTH_80P80:
width = 80;
if (!vht_cap->vht_supported)
return -EINVAL;
if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))
return -EINVAL;
break;
case NL80211_CHAN_WIDTH_160:
width = 160;
if (!vht_cap->vht_supported)
return -EINVAL;
if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ))
return -EINVAL;
break;
default:
return -EINVAL;
}
if (!cfg80211_secondary_chans_ok(&rdev->wiphy, chandef->center_freq1,
width, IEEE80211_CHAN_DISABLED))
if (!cfg80211_chandef_usable(&rdev->wiphy, chandef,
IEEE80211_CHAN_DISABLED))
return -EINVAL;
if (chandef->center_freq2 &&
!cfg80211_secondary_chans_ok(&rdev->wiphy, chandef->center_freq2,
width, IEEE80211_CHAN_DISABLED))
return -EINVAL;
/* TODO: missing regulatory check on bandwidth */
return 0;
}
@ -1841,7 +1811,7 @@ static inline u64 wdev_id(struct wireless_dev *wdev)
static int nl80211_send_chandef(struct sk_buff *msg,
struct cfg80211_chan_def *chandef)
{
WARN_ON(!cfg80211_chan_def_valid(chandef));
WARN_ON(!cfg80211_chandef_valid(chandef));
if (nla_put_u32(msg, NL80211_ATTR_WIPHY_FREQ,
chandef->chan->center_freq))