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Diffstat (limited to 'net/mac80211/rx.c')
-rw-r--r--net/mac80211/rx.c86
1 files changed, 68 insertions, 18 deletions
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index e48724a6725e..4d7543d1a62c 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -208,6 +208,51 @@ ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local,
return len;
}
+static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb,
+ int rtap_vendor_space)
+{
+ struct {
+ struct ieee80211_hdr_3addr hdr;
+ u8 category;
+ u8 action_code;
+ } __packed action;
+
+ if (!sdata)
+ return;
+
+ BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1);
+
+ if (skb->len < rtap_vendor_space + sizeof(action) +
+ VHT_MUMIMO_GROUPS_DATA_LEN)
+ return;
+
+ if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr))
+ return;
+
+ skb_copy_bits(skb, rtap_vendor_space, &action, sizeof(action));
+
+ if (!ieee80211_is_action(action.hdr.frame_control))
+ return;
+
+ if (action.category != WLAN_CATEGORY_VHT)
+ return;
+
+ if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT)
+ return;
+
+ if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr))
+ return;
+
+ skb = skb_copy(skb, GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
+ skb_queue_tail(&sdata->skb_queue, skb);
+ ieee80211_queue_work(&sdata->local->hw, &sdata->work);
+}
+
/*
* ieee80211_add_rx_radiotap_header - add radiotap header
*
@@ -515,7 +560,6 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
struct net_device *prev_dev = NULL;
int present_fcs_len = 0;
unsigned int rtap_vendor_space = 0;
- struct ieee80211_mgmt *mgmt;
struct ieee80211_sub_if_data *monitor_sdata =
rcu_dereference(local->monitor_sdata);
@@ -553,6 +597,8 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
return remove_monitor_info(local, origskb, rtap_vendor_space);
}
+ ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_vendor_space);
+
/* room for the radiotap header based on driver features */
rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, origskb);
needed_headroom = rt_hdrlen - rtap_vendor_space;
@@ -618,23 +664,6 @@ ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb,
ieee80211_rx_stats(sdata->dev, skb->len);
}
- mgmt = (void *)skb->data;
- if (monitor_sdata &&
- skb->len >= IEEE80211_MIN_ACTION_SIZE + 1 + VHT_MUMIMO_GROUPS_DATA_LEN &&
- ieee80211_is_action(mgmt->frame_control) &&
- mgmt->u.action.category == WLAN_CATEGORY_VHT &&
- mgmt->u.action.u.vht_group_notif.action_code == WLAN_VHT_ACTION_GROUPID_MGMT &&
- is_valid_ether_addr(monitor_sdata->u.mntr.mu_follow_addr) &&
- ether_addr_equal(mgmt->da, monitor_sdata->u.mntr.mu_follow_addr)) {
- struct sk_buff *mu_skb = skb_copy(skb, GFP_ATOMIC);
-
- if (mu_skb) {
- mu_skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME;
- skb_queue_tail(&monitor_sdata->skb_queue, mu_skb);
- ieee80211_queue_work(&local->hw, &monitor_sdata->work);
- }
- }
-
if (prev_dev) {
skb->dev = prev_dev;
netif_receive_skb(skb);
@@ -3610,6 +3639,27 @@ static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx)
!ether_addr_equal(bssid, hdr->addr1))
return false;
}
+
+ /*
+ * 802.11-2016 Table 9-26 says that for data frames, A1 must be
+ * the BSSID - we've checked that already but may have accepted
+ * the wildcard (ff:ff:ff:ff:ff:ff).
+ *
+ * It also says:
+ * The BSSID of the Data frame is determined as follows:
+ * a) If the STA is contained within an AP or is associated
+ * with an AP, the BSSID is the address currently in use
+ * by the STA contained in the AP.
+ *
+ * So we should not accept data frames with an address that's
+ * multicast.
+ *
+ * Accepting it also opens a security problem because stations
+ * could encrypt it with the GTK and inject traffic that way.
+ */
+ if (ieee80211_is_data(hdr->frame_control) && multicast)
+ return false;
+
return true;
case NL80211_IFTYPE_WDS:
if (bssid || !ieee80211_is_data(hdr->frame_control))