linux/net/mac80211/eht.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * EHT handling
 *
 * Copyright(c) 2021-2025 Intel Corporation
 */

#include "driver-ops.h"
#include "ieee80211_i.h"

void
ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data *sdata,
				    struct ieee80211_supported_band *sband,
				    const u8 *he_cap_ie, u8 he_cap_len,
				    const struct ieee80211_eht_cap_elem *eht_cap_ie_elem,
				    u8 eht_cap_len,
				    struct link_sta_info *link_sta)
{
	struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
	struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
	u8 eht_ppe_size = 0;
	u8 mcs_nss_size;
	u8 eht_total_size = sizeof(eht_cap->eht_cap_elem);
	u8 *pos = (u8 *)eht_cap_ie_elem;

	memset(eht_cap, 0, sizeof(*eht_cap));

	if (!eht_cap_ie_elem ||
	    !ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif))
		return;

	mcs_nss_size = ieee80211_eht_mcs_nss_size(he_cap_ie_elem,
						  &eht_cap_ie_elem->fixed,
						  sdata->vif.type ==
							NL80211_IFTYPE_STATION);

	eht_total_size += mcs_nss_size;

	/* Calculate the PPE thresholds length only if the header is present */
	if (eht_cap_ie_elem->fixed.phy_cap_info[5] &
			IEEE80211_EHT_PHY_CAP5_PPE_THRESHOLD_PRESENT) {
		u16 eht_ppe_hdr;

		if (eht_cap_len < eht_total_size + sizeof(u16))
			return;

		eht_ppe_hdr = get_unaligned_le16(eht_cap_ie_elem->optional + mcs_nss_size);
		eht_ppe_size =
			ieee80211_eht_ppe_size(eht_ppe_hdr,
					       eht_cap_ie_elem->fixed.phy_cap_info);
		eht_total_size += eht_ppe_size;

		/* we calculate as if NSS > 8 are valid, but don't handle that */
		if (eht_ppe_size > sizeof(eht_cap->eht_ppe_thres))
			return;
	}

	if (eht_cap_len < eht_total_size)
		return;

	/* Copy the static portion of the EHT capabilities */
	memcpy(&eht_cap->eht_cap_elem, pos, sizeof(eht_cap->eht_cap_elem));
	pos += sizeof(eht_cap->eht_cap_elem);

	/* Copy MCS/NSS which depends on the peer capabilities */
	memset(&eht_cap->eht_mcs_nss_supp, 0,
	       sizeof(eht_cap->eht_mcs_nss_supp));
	memcpy(&eht_cap->eht_mcs_nss_supp, pos, mcs_nss_size);

	if (eht_ppe_size)
		memcpy(eht_cap->eht_ppe_thres,
		       &eht_cap_ie_elem->optional[mcs_nss_size],
		       eht_ppe_size);

	eht_cap->has_eht = true;

	link_sta->cur_max_bandwidth = ieee80211_sta_cap_rx_bw(link_sta);
	link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);

	/*
	 * The MPDU length bits are reserved on all but 2.4 GHz and get set via
	 * VHT (5 GHz) or HE (6 GHz) capabilities.
	 */
	if (sband->band != NL80211_BAND_2GHZ)
		return;

	switch (u8_get_bits(eht_cap->eht_cap_elem.mac_cap_info[0],
			    IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_MASK)) {
	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_11454:
		link_sta->pub->agg.max_amsdu_len =
			IEEE80211_MAX_MPDU_LEN_VHT_11454;
		break;
	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_7991:
		link_sta->pub->agg.max_amsdu_len =
			IEEE80211_MAX_MPDU_LEN_VHT_7991;
		break;
	case IEEE80211_EHT_MAC_CAP0_MAX_MPDU_LEN_3895:
	default:
		link_sta->pub->agg.max_amsdu_len =
			IEEE80211_MAX_MPDU_LEN_VHT_3895;
		break;
	}

	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, int opt_len)
{
	int len = IEEE80211_MIN_ACTION_SIZE(eml_omn);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_mgmt *mgmt;
	struct sk_buff *skb;

	len += opt_len; /* optional len */
	skb = dev_alloc_skb(local->tx_headroom + len);
	if (!skb)
		return;

	skb_reserve(skb, local->tx_headroom);
	mgmt = skb_put_zero(skb, 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;
	mgmt->u.action.action_code = WLAN_PROTECTED_EHT_ACTION_EML_OP_MODE_NOTIF;
	mgmt->u.action.eml_omn.dialog_token =
		req->u.action.eml_omn.dialog_token;
	mgmt->u.action.eml_omn.control = req->u.action.eml_omn.control &
		~(IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE |
		  IEEE80211_EML_CTRL_INDEV_COEX_ACT);
	/* Copy optional fields from the received notification frame */
	memcpy(mgmt->u.action.eml_omn.variable,
	       req->u.action.eml_omn.variable, opt_len);

	ieee80211_tx_skb(sdata, skb);
}

void ieee80211_rx_eml_op_mode_notif(struct ieee80211_sub_if_data *sdata,
				    struct sk_buff *skb)
{
	int len = IEEE80211_MIN_ACTION_SIZE(eml_omn);
	enum nl80211_iftype type = ieee80211_vif_type_p2p(&sdata->vif);
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	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.eml_omn.control;
	u8 *ptr = mgmt->u.action.eml_omn.variable;
	struct ieee80211_eml_params eml_params = {
		.link_id = status->link_id,
		.control = control,
	};
	struct sta_info *sta;
	int opt_len = 0;

	if (!ieee80211_vif_is_mld(&sdata->vif))
		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_EMLMR_MODE) &&
	    (control & IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE))
		return;

	ift_ext_capa = cfg80211_get_iftype_ext_capa(local->hw.wiphy, type);
	if (!ift_ext_capa)
		return;

	if (!status->link_valid)
		return;

	sta = sta_info_get_bss(sdata, mgmt->sa);
	if (!sta)
		return;

	if (control & IEEE80211_EML_CTRL_EMLSR_MODE) {
		u8 emlsr_param_update_len;

		if (!(ift_ext_capa->eml_capabilities &
		      IEEE80211_EML_CAP_EMLSR_SUPP))
			return;

		opt_len += sizeof(__le16); /* eMLSR link_bitmap */
		/* eMLSR param update field is not part of Notfication frame
		 * sent by the AP to client so account it separately.
		 */
		emlsr_param_update_len =
			!!(control & IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE);

		if (skb->len < len + opt_len + emlsr_param_update_len)
			return;

		if (control & IEEE80211_EML_CTRL_EMLSR_PARAM_UPDATE) {
			u8 pad_delay, trans_delay;

			pad_delay = u8_get_bits(ptr[2],
						IEEE80211_EML_EMLSR_PAD_DELAY);
			if (pad_delay >
			    IEEE80211_EML_CAP_EMLSR_PADDING_DELAY_256US)
				return;

			trans_delay = u8_get_bits(ptr[2],
					IEEE80211_EML_EMLSR_TRANS_DELAY);
			if (trans_delay >
			    IEEE80211_EML_CAP_EMLSR_TRANSITION_DELAY_256US)
				return;

			/* Update sta padding and transition delay */
			sta->sta.eml_cap =
				u8_replace_bits(sta->sta.eml_cap,
						pad_delay,
						IEEE80211_EML_CAP_EMLSR_PADDING_DELAY);
			sta->sta.eml_cap =
				u8_replace_bits(sta->sta.eml_cap,
						trans_delay,
						IEEE80211_EML_CAP_EMLSR_TRANSITION_DELAY);
		}
	}

	if (control & IEEE80211_EML_CTRL_EMLMR_MODE) {
		u8 mcs_map_size;
		int i;

		if (!(ift_ext_capa->eml_capabilities &
		      IEEE80211_EML_CAP_EMLMR_SUPPORT))
			return;

		opt_len += sizeof(__le16); /* eMLMR link_bitmap */
		opt_len++; /* eMLMR mcs_map_count */
		if (skb->len < len + opt_len)
			return;

		eml_params.emlmr_mcs_map_count = ptr[2];
		if (eml_params.emlmr_mcs_map_count > 2)
			return;

		mcs_map_size = 3 * (1 + eml_params.emlmr_mcs_map_count);
		opt_len += mcs_map_size;
		if (skb->len < len + opt_len)
			return;

		for (i = 0; i < mcs_map_size; i++) {
			u8 rx_mcs, tx_mcs;

			rx_mcs = u8_get_bits(ptr[3 + i],
					     IEEE80211_EML_EMLMR_RX_MCS_MAP);
			if (rx_mcs > 8)
				return;

			tx_mcs = u8_get_bits(ptr[3 + i],
					     IEEE80211_EML_EMLMR_TX_MCS_MAP);
			if (tx_mcs > 8)
				return;
		}

		memcpy(eml_params.emlmr_mcs_map_bw, &ptr[3], mcs_map_size);
	}

	if ((control & IEEE80211_EML_CTRL_EMLSR_MODE) ||
	    (control & IEEE80211_EML_CTRL_EMLMR_MODE)) {
		eml_params.link_bitmap = get_unaligned_le16(ptr);
		if ((eml_params.link_bitmap & sdata->vif.active_links) !=
		    eml_params.link_bitmap)
			return;
	}

	if (drv_set_eml_op_mode(sdata, &sta->sta, &eml_params))
		return;

	ieee80211_send_eml_op_mode_notif(sdata, mgmt, opt_len);
}