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-rw-r--r--net/mac80211/rx.c96
1 files changed, 77 insertions, 19 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 0ba98ad9bc85..91a13aee4378 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -6,7 +6,7 @@
* Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright(c) 2015 - 2017 Intel Deutschland GmbH
- * Copyright (C) 2018-2019 Intel Corporation
+ * Copyright (C) 2018-2020 Intel Corporation
*/
#include <linux/jiffies.h>
@@ -983,7 +983,8 @@ static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
return -1;
- if (!ieee80211_is_robust_mgmt_frame(skb))
+ if (!ieee80211_is_robust_mgmt_frame(skb) &&
+ !ieee80211_is_beacon(hdr->frame_control))
return -1; /* not a robust management frame */
mmie = (struct ieee80211_mmie *)
@@ -1450,8 +1451,7 @@ ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx)
return RX_CONTINUE;
if (ieee80211_is_ctl(hdr->frame_control) ||
- ieee80211_is_nullfunc(hdr->frame_control) ||
- ieee80211_is_qos_nullfunc(hdr->frame_control) ||
+ ieee80211_is_any_nullfunc(hdr->frame_control) ||
is_multicast_ether_addr(hdr->addr1))
return RX_CONTINUE;
@@ -1838,8 +1838,7 @@ ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
* Drop (qos-)data::nullfunc frames silently, since they
* are used only to control station power saving mode.
*/
- if (ieee80211_is_nullfunc(hdr->frame_control) ||
- ieee80211_is_qos_nullfunc(hdr->frame_control)) {
+ if (ieee80211_is_any_nullfunc(hdr->frame_control)) {
I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc);
/*
@@ -1870,6 +1869,41 @@ ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
return RX_CONTINUE;
} /* ieee80211_rx_h_sta_process */
+static struct ieee80211_key *
+ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx)
+{
+ struct ieee80211_key *key = NULL;
+ struct ieee80211_sub_if_data *sdata = rx->sdata;
+ int idx2;
+
+ /* Make sure key gets set if either BIGTK key index is set so that
+ * ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected
+ * Beacon frames and Beacon frames that claim to use another BIGTK key
+ * index (i.e., a key that we do not have).
+ */
+
+ if (idx < 0) {
+ idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS;
+ idx2 = idx + 1;
+ } else {
+ if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS)
+ idx2 = idx + 1;
+ else
+ idx2 = idx - 1;
+ }
+
+ if (rx->sta)
+ key = rcu_dereference(rx->sta->gtk[idx]);
+ if (!key)
+ key = rcu_dereference(sdata->keys[idx]);
+ if (!key && rx->sta)
+ key = rcu_dereference(rx->sta->gtk[idx2]);
+ if (!key)
+ key = rcu_dereference(sdata->keys[idx2]);
+
+ return key;
+}
+
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
{
@@ -1887,17 +1921,18 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
/*
* Key selection 101
*
- * There are four types of keys:
+ * There are five types of keys:
* - GTK (group keys)
* - IGTK (group keys for management frames)
+ * - BIGTK (group keys for Beacon frames)
* - PTK (pairwise keys)
* - STK (station-to-station pairwise keys)
*
* When selecting a key, we have to distinguish between multicast
* (including broadcast) and unicast frames, the latter can only
- * use PTKs and STKs while the former always use GTKs and IGTKs.
- * Unless, of course, actual WEP keys ("pre-RSNA") are used, then
- * unicast frames can also use key indices like GTKs. Hence, if we
+ * use PTKs and STKs while the former always use GTKs, IGTKs, and
+ * BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used,
+ * then unicast frames can also use key indices like GTKs. Hence, if we
* don't have a PTK/STK we check the key index for a WEP key.
*
* Note that in a regular BSS, multicast frames are sent by the
@@ -1941,6 +1976,20 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
/* Skip decryption if the frame is not protected. */
if (!ieee80211_has_protected(fc))
return RX_CONTINUE;
+ } else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) {
+ /* Broadcast/multicast robust management frame / BIP */
+ if ((status->flag & RX_FLAG_DECRYPTED) &&
+ (status->flag & RX_FLAG_IV_STRIPPED))
+ return RX_CONTINUE;
+
+ if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS ||
+ mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS +
+ NUM_DEFAULT_BEACON_KEYS)
+ return RX_DROP_MONITOR; /* unexpected BIP keyidx */
+
+ rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx);
+ if (!rx->key)
+ return RX_CONTINUE; /* Beacon protection not in use */
} else if (mmie_keyidx >= 0) {
/* Broadcast/multicast robust management frame / BIP */
if ((status->flag & RX_FLAG_DECRYPTED) &&
@@ -1970,11 +2019,12 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
struct ieee80211_sub_if_data *sdata = rx->sdata;
int i;
- if (ieee80211_is_mgmt(fc) &&
- is_multicast_ether_addr(hdr->addr1) &&
- (key = rcu_dereference(rx->sdata->default_mgmt_key)))
- rx->key = key;
- else {
+ if (ieee80211_is_beacon(fc)) {
+ key = ieee80211_rx_get_bigtk(rx, -1);
+ } else if (ieee80211_is_mgmt(fc) &&
+ is_multicast_ether_addr(hdr->addr1)) {
+ key = rcu_dereference(rx->sdata->default_mgmt_key);
+ } else {
if (rx->sta) {
for (i = 0; i < NUM_DEFAULT_KEYS; i++) {
key = rcu_dereference(rx->sta->gtk[i]);
@@ -1989,9 +2039,9 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
break;
}
}
- if (key)
- rx->key = key;
}
+ if (key)
+ rx->key = key;
return RX_CONTINUE;
} else {
/*
@@ -2319,7 +2369,7 @@ static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc)
/* Drop unencrypted frames if key is set. */
if (unlikely(!ieee80211_has_protected(fc) &&
- !ieee80211_is_nullfunc(fc) &&
+ !ieee80211_is_any_nullfunc(fc) &&
ieee80211_is_data(fc) && rx->key))
return -EACCES;
@@ -2360,6 +2410,9 @@ static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx)
rx->skb->len);
return -EACCES;
}
+ if (unlikely(ieee80211_is_beacon(fc) && rx->key &&
+ ieee80211_get_mmie_keyidx(rx->skb) < 0))
+ return -EACCES;
/*
* When using MFP, Action frames are not allowed prior to
* having configured keys.
@@ -2444,7 +2497,8 @@ static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
struct net_device *dev = sdata->dev;
if (unlikely((skb->protocol == sdata->control_port_protocol ||
- skb->protocol == cpu_to_be16(ETH_P_PREAUTH)) &&
+ (skb->protocol == cpu_to_be16(ETH_P_PREAUTH) &&
+ !sdata->control_port_no_preauth)) &&
sdata->control_port_over_nl80211)) {
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED);
@@ -3084,6 +3138,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
enum ieee80211_smps_mode smps_mode;
struct sta_opmode_info sta_opmode = {};
+ if (sdata->vif.type != NL80211_IFTYPE_AP &&
+ sdata->vif.type != NL80211_IFTYPE_AP_VLAN)
+ goto handled;
+
/* convert to HT capability */
switch (mgmt->u.action.u.ht_smps.smps_control) {
case WLAN_HT_SMPS_CONTROL_DISABLED:
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-30 16:57:15 +0000