mac80211: fix A-MSDU outer SA/DA

According to IEEE 802.11-2012 section 8.3.2 table 8-19, the outer SA/DA
of A-MSDU frames need to be changed depending on FromDS/ToDS values.

Signed-off-by: Michael Braun <michael-dev@fami-braun.de>
[use ether_addr_copy and add alignment annotations]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index a810dfc..e50c9e0 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1438,7 +1438,7 @@ enum ieee80211_vif_flags {
 struct ieee80211_vif {
        enum nl80211_iftype type;
        struct ieee80211_bss_conf bss_conf;
-       u8 addr[ETH_ALEN];
+       u8 addr[ETH_ALEN] __aligned(2);
        bool p2p;
        bool csa_active;
        bool mu_mimo_owner;

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 103187c..42d194a 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -443,7 +443,7 @@ struct ieee80211_if_managed {
        struct ieee80211_mgd_auth_data *auth_data;
        struct ieee80211_mgd_assoc_data *assoc_data;
 
-       u8 bssid[ETH_ALEN];
+       u8 bssid[ETH_ALEN] __aligned(2);
 
        u16 aid;
 

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 9661f54..772e369 100644 (file)
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3064,6 +3064,7 @@ static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
        int subframe_len = skb->len - hdr_len;
        void *data;
        u8 *qc, *h_80211_src, *h_80211_dst;
+       const u8 *bssid;
 
        if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
                return false;
@@ -3087,6 +3088,28 @@ static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
        ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
        ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
 
+       /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
+        * fields needs to be changed to BSSID for A-MSDU frames depending
+        * on FromDS/ToDS values.
+        */
+       switch (sdata->vif.type) {
+       case NL80211_IFTYPE_STATION:
+               bssid = sdata->u.mgd.bssid;
+               break;
+       case NL80211_IFTYPE_AP:
+       case NL80211_IFTYPE_AP_VLAN:
+               bssid = sdata->vif.addr;
+               break;
+       default:
+               bssid = NULL;
+       }
+
+       if (bssid && ieee80211_has_fromds(hdr->frame_control))
+               ether_addr_copy(h_80211_src, bssid);
+
+       if (bssid && ieee80211_has_tods(hdr->frame_control))
+               ether_addr_copy(h_80211_dst, bssid);
+
        qc = ieee80211_get_qos_ctl(hdr);
        *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;