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-...@fami-braun.de>

--
v5:
 - single out amsdu_hdr to ptr conversion before
v4:
 - h_80211_src/dst has been memmove'd and thus needs to be fixed
v3:
 - write to outer 802.11 header instead of inner amsdu subframe header
v2:
 - avoid the extra write to amsdu_hdr
 - avoid copy of asmdu_hdr into skb, use ptr instead
---
 net/mac80211/tx.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 56a883b..7fcd4b6 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -3051,6 +3051,7 @@ 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;
@@ -3074,6 +3075,28 @@ 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))
+               memcpy(h_80211_src, bssid, ETH_ALEN);
+
+       if (bssid && ieee80211_has_tods(hdr->frame_control))
+               memcpy(h_80211_dst, bssid, ETH_ALEN);
+
        qc = ieee80211_get_qos_ctl(hdr);
        *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 
-- 
2.1.4

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