[PATCH AUTOSEL 4.19 15/59] mac80211: accept deauth frames in IBSS mode
From: Sasha Levin <sashal@kernel.org>
Date: 2019-10-26 13:30:42
Also in:
linux-wireless, lkml, stable
Subsystem:
mac80211, the rest · Maintainers:
Johannes Berg, Linus Torvalds
From: Johannes Berg <redacted>
[ Upstream commit 95697f9907bfe3eab0ef20265a766b22e27dde64 ]
We can process deauth frames and all, but we drop them very
early in the RX path today - this could never have worked.
Fixes: 2cc59e784b54 ("mac80211: reply to AUTH with DEAUTH if sta allocation fails in IBSS")
Signed-off-by: Johannes Berg <redacted>
Signed-off-by: Luca Coelho <redacted>
Link: https://lore.kernel.org/r/20191004123706.15768-2-luca@coelho.fi (local)
Signed-off-by: Johannes Berg <redacted>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/mac80211/rx.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index b12f23c996f4e..02d0b22d01141 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c@@ -3391,9 +3391,18 @@ ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): /* process for all: mesh, mlme, ibss */ break; + case cpu_to_le16(IEEE80211_STYPE_DEAUTH): + if (is_multicast_ether_addr(mgmt->da) && + !is_broadcast_ether_addr(mgmt->da)) + return RX_DROP_MONITOR; + + /* process only for station/IBSS */ + if (sdata->vif.type != NL80211_IFTYPE_STATION && + sdata->vif.type != NL80211_IFTYPE_ADHOC) + return RX_DROP_MONITOR; + break; case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): - case cpu_to_le16(IEEE80211_STYPE_DEAUTH): case cpu_to_le16(IEEE80211_STYPE_DISASSOC): if (is_multicast_ether_addr(mgmt->da) && !is_broadcast_ether_addr(mgmt->da))
--
2.20.1