[PATCH wireless-next 04/18] wifi: cfg80211/mac80211: Configure AP with SMD capabilities

[Pooventhiran G <pooventhiran.g@oss.qualcomm.com>]

From: Rohan Dutta <drohan@qti.qualcomm.com>

When an AP is getting started, configure the AP as SMD-enabled if
userspace defines configuration for the Seamless Mobility Domain (SMD).

The SMD parameters are:
 - SMD Identifier: unique identifier of the SMD
 - SMD Preparation Timeout: Valid duration for a prepared target AP MLD
 - Downlink Data Forwarding: Forwarding support for buffered DL packets
 - Max number of Peer AP MLDs: Number of target AP MLDs a non-AP MLD can
       prepare with
 - SMD Type: Type of SMD
 - SMD PTK Mode: PTK mode used in the SMD
 - Neighbor Probing: UHR Neighboring AP Probing

Without these parameters configured, drivers and lower layers cannot be
able to support SMD BSS Transition.

Signed-off-by: Rohan Dutta <drohan@qti.qualcomm.com>
Co-developed-by: Aditya Sathish <asathish@qti.qualcomm.com>
Signed-off-by: Aditya Sathish <asathish@qti.qualcomm.com>
Co-developed-by: Sidhanta Sahu <sidhanta.sahu@oss.qualcomm.com>
Signed-off-by: Sidhanta Sahu <sidhanta.sahu@oss.qualcomm.com>
Signed-off-by: Pooventhiran G <pooventhiran.g@oss.qualcomm.com>
---
 include/net/cfg80211.h | 25 ++++++++++++++++
 include/net/mac80211.h |  2 ++
 net/mac80211/cfg.c     |  5 ++++
 net/wireless/nl80211.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 110 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 6461a7bd0169..d0a269f4c711 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -1587,6 +1587,29 @@ struct cfg80211_s1g_short_beacon {
 	size_t short_tail_len;
 };
 
+/**
+ * struct cfg80211_smd_params - Seamless Mobility Domain parameters
+ *
+ * @smd_enabled: SMD is enabled on this device
+ * @smd_identifier: SMD ID (ETH_ALEN bytes)
+ * @smd_timeout: timeout in 64 TUs for ST preparation
+ * @dl_data_fwd: MSDU forwarding supported
+ * @max_num_of_peer_apmlds: max prepared AP MLDs supported (0-7)
+ * @smd_type: SMD type
+ * @ptk_mode: PTK mode
+ * @neighbor_probing: UHR Neighboring AP Probing supported
+ */
+struct cfg80211_smd_params {
+	bool smd_enabled;
+	u8 smd_identifier[ETH_ALEN];
+	u16 smd_timeout;
+	bool dl_data_fwd;
+	u8 max_num_of_peer_apmlds;
+	enum nl80211_smd_type smd_type;
+	enum nl80211_smd_ptk_mode ptk_mode;
+	bool neighbor_probing;
+};
+
 /**
  * struct cfg80211_ap_settings - AP configuration
  *
@@ -1623,6 +1646,7 @@ struct cfg80211_s1g_short_beacon {
  * @mbssid_config: AP settings for multiple bssid
  * @s1g_long_beacon_period: S1G long beacon period
  * @s1g_short_beacon: S1G short beacon data
+ * @smd_params: Seamless Mobility Domain (SMD) parameters
  */
 struct cfg80211_ap_settings {
 	struct cfg80211_chan_def chandef;
@@ -1655,6 +1679,7 @@ struct cfg80211_ap_settings {
 	struct cfg80211_mbssid_config mbssid_config;
 	u8 s1g_long_beacon_period;
 	struct cfg80211_s1g_short_beacon s1g_short_beacon;
+	struct cfg80211_smd_params smd_params;
 };
 
 
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 7bb4618065b6..6b82ca07fbf0 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -797,6 +797,7 @@ struct ieee80211_bss_npca_params {
  * @s1g_long_beacon_period: number of beacon intervals between each long
  *	beacon transmission.
  * @npca: NPCA parameters
+ * @smd_params: SMD parameters
  */
 struct ieee80211_bss_conf {
 	struct ieee80211_vif *vif;
@@ -904,6 +905,7 @@ struct ieee80211_bss_conf {
 	u8 s1g_long_beacon_period;
 
 	struct ieee80211_bss_npca_params npca;
+	struct cfg80211_smd_params smd_params;
 };
 
 #define IEEE80211_NAN_MAX_CHANNELS 3
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 23f4f9ec86d0..b4b42790c5d7 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1796,6 +1796,11 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
 		}
 	}
 
+	if (params->smd_params.smd_enabled)
+		link_conf->smd_params = params->smd_params;
+	else
+		link_conf->smd_params.smd_enabled = false;
+
 	if (sdata->vif.type == NL80211_IFTYPE_AP &&
 	    params->mbssid_config.tx_wdev) {
 		err = ieee80211_set_ap_mbssid_options(sdata,
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 22d71f32815f..aa7aa70a5b41 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -7224,6 +7224,78 @@ static int nl80211_check_npca(struct cfg80211_registered_device *rdev,
 	return -EINVAL;
 }
 
+static int nl80211_parse_smd_params(struct genl_info *info,
+				    struct cfg80211_smd_params *smd_params)
+{
+	struct nlattr *smd_params_attr = info->attrs[NL80211_ATTR_SMD_PARAMS];
+	struct cfg80211_registered_device *rdev = info->user_ptr[0];
+	struct net_device *dev = info->user_ptr[1];
+	struct wireless_dev *wdev = dev->ieee80211_ptr;
+	struct nlattr *tb[NL80211_SMD_PARAMS_ATTR_MAX + 1];
+	int err;
+
+	if (!wiphy_ext_feature_isset(&rdev->wiphy,
+				     NL80211_EXT_FEATURE_SMD)) {
+		GENL_SET_ERR_MSG(info, "SMD is not supported");
+		return -EOPNOTSUPP;
+	}
+
+	if (!wdev->valid_links) {
+		GENL_SET_ERR_MSG(info, "SMD is not allowed without MLO");
+		return -EINVAL;
+	}
+
+	err = nla_parse_nested(tb, NL80211_SMD_PARAMS_ATTR_MAX,
+			       smd_params_attr, nl80211_smd_params_policy,
+			       NULL);
+	if (err) {
+		GENL_SET_ERR_MSG(info, "failed to parse SMD parameters");
+		return err;
+	}
+
+	if (!tb[NL80211_SMD_PARAMS_ATTR_IDENTIFIER] ||
+	    !tb[NL80211_SMD_PARAMS_ATTR_TIMEOUT] ||
+	    !tb[NL80211_SMD_PARAMS_ATTR_MAX_PEER_APMLDS] ||
+	    !tb[NL80211_SMD_PARAMS_ATTR_TYPE] ||
+	    !tb[NL80211_SMD_PARAMS_ATTR_PTK_MODE]) {
+		GENL_SET_ERR_MSG(info, "required SMD parameters are missing");
+		return -EINVAL;
+	}
+
+	memcpy(smd_params->smd_identifier,
+	       nla_data(tb[NL80211_SMD_PARAMS_ATTR_IDENTIFIER]),
+	       ETH_ALEN);
+
+	smd_params->smd_timeout =
+		nla_get_u16(tb[NL80211_SMD_PARAMS_ATTR_TIMEOUT]);
+
+	smd_params->dl_data_fwd =
+		!!tb[NL80211_SMD_PARAMS_ATTR_DL_DATA_FORWARDING];
+	if (smd_params->dl_data_fwd &&
+	    !wiphy_ext_feature_isset(&rdev->wiphy,
+				     NL80211_EXT_FEATURE_SMD_DL_PKT_FORWARDING)) {
+		GENL_SET_ERR_MSG(info,
+				 "SMD DL packet forwarding is not supported");
+		return -EOPNOTSUPP;
+	}
+
+	smd_params->max_num_of_peer_apmlds =
+		nla_get_u8(tb[NL80211_SMD_PARAMS_ATTR_MAX_PEER_APMLDS]);
+
+	smd_params->smd_type =
+		nla_get_u8(tb[NL80211_SMD_PARAMS_ATTR_TYPE]);
+
+	smd_params->ptk_mode =
+		nla_get_u8(tb[NL80211_SMD_PARAMS_ATTR_PTK_MODE]);
+
+	smd_params->neighbor_probing =
+		!!tb[NL80211_SMD_PARAMS_ATTR_NEIGHBOR_PROBING];
+
+	smd_params->smd_enabled = true;
+
+	return 0;
+}
+
 static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 {
 	struct cfg80211_registered_device *rdev = info->user_ptr[0];
@@ -7505,6 +7577,12 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 
 	/* FIXME: validate MLO/link-id against driver capabilities */
 
+	if (info->attrs[NL80211_ATTR_SMD_PARAMS]) {
+		err = nl80211_parse_smd_params(info, &params->smd_params);
+		if (err)
+			goto out;
+	}
+
 	err = rdev_start_ap(rdev, dev, params);
 	if (!err) {
 		wdev->links[link_id].ap.beacon_interval = params->beacon_interval;

-- 
2.34.1