diff options
author | Johannes Berg <johannes.berg@intel.com> | 2020-03-26 16:09:42 +0300 |
---|---|---|
committer | Sasha Levin <sashal@kernel.org> | 2021-08-26 15:37:25 +0300 |
commit | ca37ab969cce230dce0d478d46c4dc7db8d3a267 (patch) | |
tree | c87fcf1ee352a731981f031678fd3e798a0e50c3 | |
parent | 2c20065df835c0f3b480bbaf200857d41b9eb3c8 (diff) | |
download | linux-ca37ab969cce230dce0d478d46c4dc7db8d3a267.tar.xz |
mac80211: drop data frames without key on encrypted links
commit a0761a301746ec2d92d7fcb82af69c0a6a4339aa upstream.
If we know that we have an encrypted link (based on having had
a key configured for TX in the past) then drop all data frames
in the key selection handler if there's no key anymore.
This fixes an issue with mac80211 internal TXQs - there we can
buffer frames for an encrypted link, but then if the key is no
longer there when they're dequeued, the frames are sent without
encryption. This happens if a station is disconnected while the
frames are still on the TXQ.
Detecting that a link should be encrypted based on a first key
having been configured for TX is fine as there are no use cases
for a connection going from with encryption to no encryption.
With extended key IDs, however, there is a case of having a key
configured for only decryption, so we can't just trigger this
behaviour on a key being configured.
Cc: stable@vger.kernel.org
Reported-by: Jouni Malinen <j@w1.fi>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20200326150855.6865c7f28a14.I9fb1d911b064262d33e33dfba730cdeef83926ca@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[pali: Backported to 4.19 and older versions]
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | net/mac80211/debugfs_sta.c | 1 | ||||
-rw-r--r-- | net/mac80211/key.c | 1 | ||||
-rw-r--r-- | net/mac80211/sta_info.h | 1 | ||||
-rw-r--r-- | net/mac80211/tx.c | 12 |
4 files changed, 12 insertions, 3 deletions
diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c index 14ec63a02669..91b94ac9a88a 100644 --- a/net/mac80211/debugfs_sta.c +++ b/net/mac80211/debugfs_sta.c @@ -80,6 +80,7 @@ static const char * const sta_flag_names[] = { FLAG(MPSP_OWNER), FLAG(MPSP_RECIPIENT), FLAG(PS_DELIVER), + FLAG(USES_ENCRYPTION), #undef FLAG }; diff --git a/net/mac80211/key.c b/net/mac80211/key.c index 4e23f240f599..a0d9507cb6a7 100644 --- a/net/mac80211/key.c +++ b/net/mac80211/key.c @@ -334,6 +334,7 @@ static void ieee80211_key_replace(struct ieee80211_sub_if_data *sdata, if (sta) { if (pairwise) { rcu_assign_pointer(sta->ptk[idx], new); + set_sta_flag(sta, WLAN_STA_USES_ENCRYPTION); sta->ptk_idx = idx; ieee80211_check_fast_xmit(sta); } else { diff --git a/net/mac80211/sta_info.h b/net/mac80211/sta_info.h index fd31c4db1282..0909332965bc 100644 --- a/net/mac80211/sta_info.h +++ b/net/mac80211/sta_info.h @@ -100,6 +100,7 @@ enum ieee80211_sta_info_flags { WLAN_STA_MPSP_OWNER, WLAN_STA_MPSP_RECIPIENT, WLAN_STA_PS_DELIVER, + WLAN_STA_USES_ENCRYPTION, NUM_WLAN_STA_FLAGS, }; diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index eebbddccb47b..48d0dd0beaa5 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -588,10 +588,13 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; - if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) + if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) { tx->key = NULL; - else if (tx->sta && - (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) + return TX_CONTINUE; + } + + if (tx->sta && + (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx]))) tx->key = key; else if (ieee80211_is_group_privacy_action(tx->skb) && (key = rcu_dereference(tx->sdata->default_multicast_key))) @@ -652,6 +655,9 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) if (!skip_hw && tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) info->control.hw_key = &tx->key->conf; + } else if (!ieee80211_is_mgmt(hdr->frame_control) && tx->sta && + test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) { + return TX_DROP; } return TX_CONTINUE; |