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@xxxxxxxxxxxxx>
--
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
