diff options
| author | Christian Lamparter <chunkeey@googlemail.com> | 2010-10-02 15:17:07 +0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-10-05 21:35:21 +0400 |
| commit | 85416a4fa193754ef36e12b20bb02fe661cb7f17 (patch) | |
| tree | 45228e888bd76a5f1251c55ea28377ddedfe2914 /net/mac80211/iface.c | |
| parent | 5a254ffe3ffdfa84fe076009bd8e88da412180d2 (diff) | |
| download | linux-85416a4fa193754ef36e12b20bb02fe661cb7f17.tar.xz | |
mac80211: fix rx monitor filter refcounters
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>
Diffstat (limited to 'net/mac80211/iface.c')
| -rw-r--r-- | net/mac80211/iface.c | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 66785739dad3..1300e8859ea7 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -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: |