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mac80211: verify IBSS in interface combinations

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Drivers shouldn't attempt to advertise support
for more than one IBSS interface since mac80211
doesn't support that. Check and return an error
from ieee80211_register_hw() in that case.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-05-14 01:55:23 +02:00 committed by John W. Linville
parent df64962f7d
commit 8e621fc90b
1 changed files with 17 additions and 3 deletions
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20
net/mac80211/main.c
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@ -752,11 +752,25 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
/* mac80211 doesn't support more than 1 channel */
for (i = 0; i < hw->wiphy->n_iface_combinations; i++)
if (hw->wiphy->iface_combinations[i].num_different_channels > 1)
/*
* mac80211 doesn't support more than 1 channel, and also not more
* than one IBSS interface
*/
for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
const struct ieee80211_iface_combination *c;
int j;
c = &hw->wiphy->iface_combinations[i];
if (c->num_different_channels > 1)
return -EINVAL;
for (j = 0; j < c->n_limits; j++)
if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
c->limits[j].max > 1)
return -EINVAL;
}
#ifndef CONFIG_MAC80211_MESH
/* mesh depends on Kconfig, but drivers should set it if they want */
local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);