Previously, the action frames to group address was not encrypted. But
[1] "Table 8-38 Category values" indicates "Mesh" and "Multihop" category
action frames should be encrypted (Group addressed privacy == yes). And the
encyption key should be MGTK ([1] 10.13 Group addressed robust management frame
procedures). So this patch modifies the code to make it suitable for spec.
[1] IEEE Std 802.11-2012
Signed-off-by: Masashi Honma <masashi.honma@xxxxxxxxx>
---
net/mac80211/tx.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 2030443..80afc47 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -578,6 +578,21 @@ ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
return TX_CONTINUE;
}
+static bool debug_noinline
+ieee80211_is_group_privacy_action(struct ieee80211_hdr *hdr)
+{
+ struct ieee80211_mgmt *mgmt;
+
+ if (!ieee80211_is_action(hdr->frame_control) ||
+ !is_multicast_ether_addr(hdr->addr1))
+ return false;
+
+ mgmt = (struct ieee80211_mgmt *)hdr;
+
+ return mgmt->u.action.category == WLAN_CATEGORY_MESH_ACTION ||
+ mgmt->u.action.category == WLAN_CATEGORY_MULTIHOP_ACTION;
+}
+
static ieee80211_tx_result debug_noinline
ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
{
@@ -590,6 +605,9 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
else if (tx->sta &&
(key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
tx->key = key;
+ else if (ieee80211_is_group_privacy_action(hdr) &&
+ (key = rcu_dereference(tx->sdata->default_multicast_key)))
+ tx->key = key;
else if (ieee80211_is_mgmt(hdr->frame_control) &&
is_multicast_ether_addr(hdr->addr1) &&
ieee80211_is_robust_mgmt_frame(tx->skb) &&
@@ -620,6 +638,8 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
+ if (ieee80211_is_group_privacy_action(hdr))
+ break;
if (!ieee80211_is_data_present(hdr->frame_control) &&
!ieee80211_use_mfp(hdr->frame_control, tx->sta,
tx->skb))
--
2.5.0
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
