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mac80211: fix rx monitor filter refcounters

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This patch fixes an refcounting bug. Previously it
was possible to corrupt the per-device recv. filter
and monitor management counters when:
	iw dev wlanX set monitor [new flags]
was issued on an active monitor interface.

Acked-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter
2010-10-02 13:17:07 +02:00
committed by John W. Linville
parent 5a254ffe3f
commit 85416a4fa1
3 changed files with 54 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
net/mac80211/iface.c
View File

@ -148,6 +148,26 @@ static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
return 0;
}
void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
const int offset)
{
struct ieee80211_local *local = sdata->local;
u32 flags = sdata->u.mntr_flags;
#define ADJUST(_f, _s) do { \
if (flags & MONITOR_FLAG_##_f) \
local->fif_##_s += offset; \
} while (0)
ADJUST(FCSFAIL, fcsfail);
ADJUST(PLCPFAIL, plcpfail);
ADJUST(CONTROL, control);
ADJUST(CONTROL, pspoll);
ADJUST(OTHER_BSS, other_bss);
#undef ADJUST
}
/*
* NOTE: Be very careful when changing this function, it must NOT return
* an error on interface type changes that have been pre-checked, so most
@ -240,17 +260,7 @@ static int ieee80211_do_open(struct net_device *dev, bool coming_up)
hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
}
if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
local->fif_fcsfail++;
if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
local->fif_plcpfail++;
if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
local->fif_control++;
local->fif_pspoll++;
}
if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
local->fif_other_bss++;
ieee80211_adjust_monitor_flags(sdata, 1);
ieee80211_configure_filter(local);
netif_carrier_on(dev);
@ -477,17 +487,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
}
if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
local->fif_fcsfail--;
if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
local->fif_plcpfail--;
if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL) {
local->fif_pspoll--;
local->fif_control--;
}
if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
local->fif_other_bss--;
ieee80211_adjust_monitor_flags(sdata, -1);
ieee80211_configure_filter(local);
break;
case NL80211_IFTYPE_MESH_POINT: