[PATCH wireless-next 1/2] wifi: mac80211: Add EMLSR/EMLMR action frame parsing support
Lorenzo Bianconi
lorenzo at kernel.org
Thu Jan 22 05:51:33 PST 2026
Introduce support in AP mode for parsing of the Operating Mode Notification
frame sent by the client to enable/disable MLO eMLSR or eMLMR if supported
by both the AP and the client.
Tested-by: Christian Marangi <ansuelsmth at gmail.com>
Signed-off-by: Lorenzo Bianconi <lorenzo at kernel.org>
---
include/linux/ieee80211-eht.h | 5 +++
include/linux/ieee80211.h | 6 ++++
net/mac80211/eht.c | 76 +++++++++++++++++++++++++++++++++++++++++++
net/mac80211/ieee80211_i.h | 2 ++
net/mac80211/iface.c | 10 +++++-
net/mac80211/rx.c | 8 +++++
6 files changed, 106 insertions(+), 1 deletion(-)
diff --git a/include/linux/ieee80211-eht.h b/include/linux/ieee80211-eht.h
index f9782e46c5e5241bccc84c3bbc18b1cc9ec1879c..f409469d3db87c5714c68f8dada6fa212dff5c55 100644
--- a/include/linux/ieee80211-eht.h
+++ b/include/linux/ieee80211-eht.h
@@ -558,6 +558,11 @@ struct ieee80211_mle_tdls_common_info {
#define IEEE80211_MLC_PRIO_ACCESS_PRES_AP_MLD_MAC_ADDR 0x0010
+#define IEEE80211_EML_CTRL_EMLSR_MODE BIT(0)
+#define IEEE80211_EML_CTRL_EMLMR_MODE BIT(1)
+#define IEEE80211_EML_CTRL_PARAM_UPDATE BIT(2)
+#define IEEE80211_EML_CTRL_INDEV_COEX_ACT BIT(3)
+
/* no fixed fields in PRIO_ACCESS */
/**
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index fbde215c25aa79efd339aa530896a29dbb1a8ff8..f2c6f34f39f24ce59cbb2650f70e898d24d12901 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -1186,6 +1186,12 @@ struct ieee80211_mgmt {
u8 action_code;
u8 variable[];
} __packed epcs;
+ struct {
+ u8 action_code;
+ u8 dialog_token;
+ u8 control;
+ u8 variable[];
+ } __packed eml_omn;
} u;
} __packed action;
DECLARE_FLEX_ARRAY(u8, body); /* Generic frame body */
diff --git a/net/mac80211/eht.c b/net/mac80211/eht.c
index fd41046e3b681b753e6cc7ddf82046e4bc5df9b3..f1f60d41fccfc2da4ecd2961f6a524e94a6bfa6c 100644
--- a/net/mac80211/eht.c
+++ b/net/mac80211/eht.c
@@ -102,3 +102,79 @@ ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data *sdata,
ieee80211_sta_recalc_aggregates(&link_sta->sta->sta);
}
+
+static void
+ieee80211_send_eml_op_mode_notif(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *req, u8 act_len)
+{
+ int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.eml_omn);
+ struct ieee80211_local *local = sdata->local;
+ struct ieee80211_mgmt *mgmt;
+ struct sk_buff *skb;
+
+ skb = dev_alloc_skb(local->tx_headroom + hdr_len + act_len);
+ if (!skb)
+ return;
+
+ skb_reserve(skb, local->tx_headroom);
+ mgmt = skb_put_zero(skb, hdr_len);
+ mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
+ IEEE80211_STYPE_ACTION);
+ memcpy(mgmt->da, req->sa, ETH_ALEN);
+ memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
+ memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
+
+ mgmt->u.action.category = WLAN_CATEGORY_PROTECTED_EHT;
+ memcpy(&mgmt->u.action.u.eml_omn, &req->u.action.u.eml_omn, act_len);
+ mgmt->u.action.u.eml_omn.control &= ~(IEEE80211_EML_CTRL_PARAM_UPDATE |
+ IEEE80211_EML_CTRL_INDEV_COEX_ACT);
+ ieee80211_tx_skb(sdata, skb);
+}
+
+void ieee80211_rx_eml_op_mode_notif(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb)
+{
+ int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.eml_omn);
+ enum nl80211_iftype type = ieee80211_vif_type_p2p(&sdata->vif);
+ const struct wiphy_iftype_ext_capab *ift_ext_capa;
+ struct ieee80211_mgmt *mgmt = (void *)skb->data;
+ struct ieee80211_local *local = sdata->local;
+ u8 control = mgmt->u.action.u.eml_omn.control;
+ u8 *ptr = mgmt->u.action.u.eml_omn.variable;
+ u8 act_len = 3; /* action_code + dialog_token + control */
+
+ if (!ieee80211_vif_is_mld(&sdata->vif))
+ return;
+
+ ift_ext_capa = cfg80211_get_iftype_ext_capa(local->hw.wiphy, type);
+ if (!ift_ext_capa)
+ return;
+
+ if (!(ift_ext_capa->eml_capabilities & IEEE80211_EML_CAP_EMLSR_SUPP) &&
+ !(ift_ext_capa->eml_capabilities & IEEE80211_EML_CAP_EMLMR_SUPPORT))
+ return;
+
+ /* eMLSR and eMLMR can't be enabled at the same time */
+ if ((control & IEEE80211_EML_CTRL_EMLSR_MODE) &&
+ (control & IEEE80211_EML_CTRL_EMLMR_MODE))
+ return;
+
+ if ((control & IEEE80211_EML_CTRL_EMLSR_MODE) ||
+ (control & IEEE80211_EML_CTRL_EMLMR_MODE))
+ act_len += sizeof(__le16); /* eMLSR/eMLMR link_bitmap */
+
+ if (control & IEEE80211_EML_CTRL_EMLMR_MODE) {
+ u8 mcs_map_count = ptr[3];
+
+ if (mcs_map_count > 2)
+ return;
+
+ /* mcs_map_count_control and mcs_map_bw */
+ act_len += 2 + mcs_map_count;
+ }
+
+ if (skb->len < hdr_len + act_len)
+ return;
+
+ ieee80211_send_eml_op_mode_notif(sdata, mgmt, act_len);
+}
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index dc757cb329740d621f6a9deb4e9ffe258e1b7d67..3ef93cd1fb33e2614c3e06c51d6b1ebcafa4824c 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -2837,6 +2837,8 @@ void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache);
u8 ieee80211_ie_len_eht_cap(struct ieee80211_sub_if_data *sdata);
+void ieee80211_rx_eml_op_mode_notif(struct ieee80211_sub_if_data *sdata,
+ struct sk_buff *skb);
void
ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data *sdata,
struct ieee80211_supported_band *sband,
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 3ce94b95decd64eea4ea063ae98c111bdfd57e9c..17476fd9259b68b3d9c649eabad10efa42d56cd7 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1664,7 +1664,15 @@ static void ieee80211_iface_process_skb(struct ieee80211_local *local,
}
} else if (ieee80211_is_action(mgmt->frame_control) &&
mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) {
- if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+ if (sdata->vif.type == NL80211_IFTYPE_AP) {
+ switch (mgmt->u.action.u.eml_omn.action_code) {
+ case WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF:
+ ieee80211_rx_eml_op_mode_notif(sdata, skb);
+ break;
+ default:
+ break;
+ }
+ } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
switch (mgmt->u.action.u.ttlm_req.action_code) {
case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
ieee80211_process_neg_ttlm_req(sdata, mgmt,
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index ac437256f5d5c4b34601fd4c8a6f6f80469b2522..521e44c9e8dac498122e7a595d1eb8bb5751789d 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3928,6 +3928,14 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
u.action.u.epcs))
goto invalid;
goto queue;
+ case WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF:
+ if (sdata->vif.type != NL80211_IFTYPE_AP)
+ break;
+
+ if (len < offsetofend(typeof(*mgmt),
+ u.action.u.eml_omn))
+ goto invalid;
+ goto queue;
default:
break;
}
--
2.52.0
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