1 files changed, 370 insertions, 0 deletions
diff --git a/sys/contrib/dev/iwlwifi/mld/key.c b/sys/contrib/dev/iwlwifi/mld/key.c
new file mode 100644
index 000000000000..13462a5ad79a
--- /dev/null
+++ b/sys/contrib/dev/iwlwifi/mld/key.c
@@ -0,0 +1,370 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Copyright (C) 2024 Intel Corporation
+ */
+#include "key.h"
+#include "iface.h"
+#include "sta.h"
+#include "fw/api/datapath.h"
+
+static u32 iwl_mld_get_key_flags(struct iwl_mld *mld,
+				 struct ieee80211_vif *vif,
+				 struct ieee80211_sta *sta,
+				 struct ieee80211_key_conf *key)
+{
+	struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
+	bool pairwise = key->flags & IEEE80211_KEY_FLAG_PAIRWISE;
+	bool igtk = key->keyidx == 4 || key->keyidx == 5;
+	u32 flags = 0;
+
+	if (!pairwise)
+		flags |= IWL_SEC_KEY_FLAG_MCAST_KEY;
+
+	switch (key->cipher) {
+	case WLAN_CIPHER_SUITE_TKIP:
+		flags |= IWL_SEC_KEY_FLAG_CIPHER_TKIP;
+		break;
+	case WLAN_CIPHER_SUITE_AES_CMAC:
+	case WLAN_CIPHER_SUITE_CCMP:
+		flags |= IWL_SEC_KEY_FLAG_CIPHER_CCMP;
+		break;
+	case WLAN_CIPHER_SUITE_GCMP_256:
+	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+		flags |= IWL_SEC_KEY_FLAG_KEY_SIZE;
+		fallthrough;
+	case WLAN_CIPHER_SUITE_GCMP:
+	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+		flags |= IWL_SEC_KEY_FLAG_CIPHER_GCMP;
+		break;
+	}
+
+	if (!sta && vif->type == NL80211_IFTYPE_STATION)
+		sta = mld_vif->ap_sta;
+
+	/* If we are installing an iGTK (in AP or STA mode), we need to tell
+	 * the firmware this key will en/decrypt MGMT frames.
+	 * Same goes if we are installing a pairwise key for an MFP station.
+	 * In case we're installing a groupwise key (which is not an iGTK),
+	 * then, we will not use this key for MGMT frames.
+	 */
+	if ((sta && sta->mfp && pairwise) || igtk)
+		flags |= IWL_SEC_KEY_FLAG_MFP;
+
+	if (key->flags & IEEE80211_KEY_FLAG_SPP_AMSDU)
+		flags |= IWL_SEC_KEY_FLAG_SPP_AMSDU;
+
+	return flags;
+}
+
+static u32 iwl_mld_get_key_sta_mask(struct iwl_mld *mld,
+				    struct ieee80211_vif *vif,
+				    struct ieee80211_sta *sta,
+				    struct ieee80211_key_conf *key)
+{
+	struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
+	struct ieee80211_link_sta *link_sta;
+	int sta_id;
+
+	lockdep_assert_wiphy(mld->wiphy);
+
+	/* AP group keys are per link and should be on the mcast/bcast STA */
+	if (vif->type == NL80211_IFTYPE_AP &&
+	    !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
+		struct iwl_mld_link *link = NULL;
+
+		if (key->link_id >= 0)
+			link = iwl_mld_link_dereference_check(mld_vif,
+							      key->link_id);
+
+		if (WARN_ON(!link))
+			return 0;
+
+		/* In this stage we should have both the bcast and mcast STAs */
+		if (WARN_ON(link->bcast_sta.sta_id == IWL_INVALID_STA ||
+			    link->mcast_sta.sta_id == IWL_INVALID_STA))
+			return 0;
+
+		/* IGTK/BIGTK to bcast STA */
+		if (key->keyidx >= 4)
+			return BIT(link->bcast_sta.sta_id);
+
+		/* GTK for data to mcast STA */
+		return BIT(link->mcast_sta.sta_id);
+	}
+
+	/* for client mode use the AP STA also for group keys */
+	if (!sta && vif->type == NL80211_IFTYPE_STATION)
+		sta = mld_vif->ap_sta;
+
+	/* STA should be non-NULL now */
+	if (WARN_ON(!sta))
+		return 0;
+
+	/* Key is not per-link, get the full sta mask */
+	if (key->link_id < 0)
+		return iwl_mld_fw_sta_id_mask(mld, sta);
+
+	/* The link_sta shouldn't be NULL now, but this is checked in
+	 * iwl_mld_fw_sta_id_mask
+	 */
+	link_sta = link_sta_dereference_check(sta, key->link_id);
+
+	sta_id = iwl_mld_fw_sta_id_from_link_sta(mld, link_sta);
+	if (sta_id < 0)
+		return 0;
+
+	return BIT(sta_id);
+}
+
+static int iwl_mld_add_key_to_fw(struct iwl_mld *mld, u32 sta_mask,
+				 u32 key_flags, struct ieee80211_key_conf *key)
+{
+	struct iwl_sec_key_cmd cmd = {
+		.action = cpu_to_le32(FW_CTXT_ACTION_ADD),
+		.u.add.sta_mask = cpu_to_le32(sta_mask),
+		.u.add.key_id = cpu_to_le32(key->keyidx),
+		.u.add.key_flags = cpu_to_le32(key_flags),
+		.u.add.tx_seq = cpu_to_le64(atomic64_read(&key->tx_pn)),
+	};
+	bool tkip = key->cipher == WLAN_CIPHER_SUITE_TKIP;
+	int max_key_len = sizeof(cmd.u.add.key);
+
+#ifdef CONFIG_PM_SLEEP
+	/* If there was a rekey in wowlan, FW already has the key */
+	if (mld->fw_status.resuming)
+		return 0;
+#endif
+
+	if (WARN_ON(!sta_mask))
+		return -EINVAL;
+
+	if (WARN_ON(key->keylen > max_key_len))
+		return -EINVAL;
+
+	memcpy(cmd.u.add.key, key->key, key->keylen);
+
+	if (tkip) {
+		memcpy(cmd.u.add.tkip_mic_rx_key,
+		       key->key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY,
+		       8);
+		memcpy(cmd.u.add.tkip_mic_tx_key,
+		       key->key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY,
+		       8);
+	}
+
+	return iwl_mld_send_cmd_pdu(mld, WIDE_ID(DATA_PATH_GROUP, SEC_KEY_CMD),
+				    &cmd);
+}
+
+static void iwl_mld_remove_key_from_fw(struct iwl_mld *mld, u32 sta_mask,
+				       u32 key_flags, u32 keyidx)
+{
+	struct iwl_sec_key_cmd cmd = {
+		.action = cpu_to_le32(FW_CTXT_ACTION_REMOVE),
+		.u.remove.sta_mask = cpu_to_le32(sta_mask),
+		.u.remove.key_id = cpu_to_le32(keyidx),
+		.u.remove.key_flags = cpu_to_le32(key_flags),
+	};
+
+#ifdef CONFIG_PM_SLEEP
+	/* If there was a rekey in wowlan, FW already removed the key */
+	if (mld->fw_status.resuming)
+		return;
+#endif
+
+	if (WARN_ON(!sta_mask))
+		return;
+
+	iwl_mld_send_cmd_pdu(mld, WIDE_ID(DATA_PATH_GROUP, SEC_KEY_CMD), &cmd);
+}
+
+void iwl_mld_remove_key(struct iwl_mld *mld, struct ieee80211_vif *vif,
+			struct ieee80211_sta *sta,
+			struct ieee80211_key_conf *key)
+{
+	u32 sta_mask = iwl_mld_get_key_sta_mask(mld, vif, sta, key);
+	u32 key_flags = iwl_mld_get_key_flags(mld, vif, sta, key);
+	struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
+
+	lockdep_assert_wiphy(mld->wiphy);
+
+	if (!sta_mask)
+		return;
+
+	if (key->keyidx == 4 || key->keyidx == 5) {
+		struct iwl_mld_link *mld_link;
+		unsigned int link_id = 0;
+
+		/* set to -1 for non-MLO right now */
+		if (key->link_id >= 0)
+			link_id = key->link_id;
+
+		mld_link = iwl_mld_link_dereference_check(mld_vif, link_id);
+		if (WARN_ON(!mld_link))
+			return;
+
+		if (mld_link->igtk == key)
+			mld_link->igtk = NULL;
+
+		mld->num_igtks--;
+	}
+
+	iwl_mld_remove_key_from_fw(mld, sta_mask, key_flags, key->keyidx);
+
+	/* no longer in HW */
+	key->hw_key_idx = STA_KEY_IDX_INVALID;
+}
+
+int iwl_mld_add_key(struct iwl_mld *mld,
+		    struct ieee80211_vif *vif,
+		    struct ieee80211_sta *sta,
+		    struct ieee80211_key_conf *key)
+{
+	u32 sta_mask = iwl_mld_get_key_sta_mask(mld, vif, sta, key);
+	u32 key_flags = iwl_mld_get_key_flags(mld, vif, sta, key);
+	struct iwl_mld_vif *mld_vif = iwl_mld_vif_from_mac80211(vif);
+	struct iwl_mld_link *mld_link = NULL;
+	bool igtk = key->keyidx == 4 || key->keyidx == 5;
+	int ret;
+
+	lockdep_assert_wiphy(mld->wiphy);
+
+	if (!sta_mask)
+		return -EINVAL;
+
+	if (igtk) {
+		if (mld->num_igtks == IWL_MAX_NUM_IGTKS)
+			return -EOPNOTSUPP;
+
+		u8 link_id = 0;
+
+		/* set to -1 for non-MLO right now */
+		if (key->link_id >= 0)
+			link_id = key->link_id;
+
+		mld_link = iwl_mld_link_dereference_check(mld_vif, link_id);
+
+		if (WARN_ON(!mld_link))
+			return -EINVAL;
+
+		if (mld_link->igtk) {
+			IWL_DEBUG_MAC80211(mld, "remove old IGTK %d\n",
+					   mld_link->igtk->keyidx);
+			iwl_mld_remove_key(mld, vif, sta, mld_link->igtk);
+		}
+
+		WARN_ON(mld_link->igtk);
+	}
+
+	ret = iwl_mld_add_key_to_fw(mld, sta_mask, key_flags, key);
+	if (ret)
+		return ret;
+
+	if (mld_link) {
+		mld_link->igtk = key;
+		mld->num_igtks++;
+	}
+
+	/* We don't really need this, but need it to be not invalid,
+	 * so we will know if the key is in fw.
+	 */
+	key->hw_key_idx = 0;
+
+	return 0;
+}
+
+struct remove_ap_keys_iter_data {
+	u8 link_id;
+	struct ieee80211_sta *sta;
+};
+
+static void iwl_mld_remove_ap_keys_iter(struct ieee80211_hw *hw,
+					struct ieee80211_vif *vif,
+					struct ieee80211_sta *sta,
+					struct ieee80211_key_conf *key,
+					void *_data)
+{
+	struct iwl_mld *mld = IWL_MAC80211_GET_MLD(hw);
+	struct remove_ap_keys_iter_data *data = _data;
+
+	if (key->hw_key_idx == STA_KEY_IDX_INVALID)
+		return;
+
+	/* All the pairwise keys should have been removed by now */
+	if (WARN_ON(sta))
+		return;
+
+	if (key->link_id >= 0 && key->link_id != data->link_id)
+		return;
+
+	iwl_mld_remove_key(mld, vif, data->sta, key);
+}
+
+void iwl_mld_remove_ap_keys(struct iwl_mld *mld, struct ieee80211_vif *vif,
+			    struct ieee80211_sta *sta, unsigned int link_id)
+{
+	struct remove_ap_keys_iter_data iter_data = {
+		.link_id = link_id,
+		.sta = sta,
+	};
+
+	if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION))
+		return;
+
+	ieee80211_iter_keys(mld->hw, vif,
+			    iwl_mld_remove_ap_keys_iter,
+			    &iter_data);
+}
+
+struct iwl_mvm_sta_key_update_data {
+	struct ieee80211_sta *sta;
+	u32 old_sta_mask;
+	u32 new_sta_mask;
+	int err;
+};
+
+static void iwl_mld_update_sta_key_iter(struct ieee80211_hw *hw,
+					struct ieee80211_vif *vif,
+					struct ieee80211_sta *sta,
+					struct ieee80211_key_conf *key,
+					void *_data)
+{
+	struct iwl_mvm_sta_key_update_data *data = _data;
+	struct iwl_mld *mld = IWL_MAC80211_GET_MLD(hw);
+	struct iwl_sec_key_cmd cmd = {
+		.action = cpu_to_le32(FW_CTXT_ACTION_MODIFY),
+		.u.modify.old_sta_mask = cpu_to_le32(data->old_sta_mask),
+		.u.modify.new_sta_mask = cpu_to_le32(data->new_sta_mask),
+		.u.modify.key_id = cpu_to_le32(key->keyidx),
+		.u.modify.key_flags =
+			cpu_to_le32(iwl_mld_get_key_flags(mld, vif, sta, key)),
+	};
+	int err;
+
+	/* only need to do this for pairwise keys (link_id == -1) */
+	if (sta != data->sta || key->link_id >= 0)
+		return;
+
+	err = iwl_mld_send_cmd_pdu(mld, WIDE_ID(DATA_PATH_GROUP, SEC_KEY_CMD),
+				   &cmd);
+
+	if (err)
+		data->err = err;
+}
+
+int iwl_mld_update_sta_keys(struct iwl_mld *mld,
+			    struct ieee80211_vif *vif,
+			    struct ieee80211_sta *sta,
+			    u32 old_sta_mask,
+			    u32 new_sta_mask)
+{
+	struct iwl_mvm_sta_key_update_data data = {
+		.sta = sta,
+		.old_sta_mask = old_sta_mask,
+		.new_sta_mask = new_sta_mask,
+	};
+
+	ieee80211_iter_keys(mld->hw, vif, iwl_mld_update_sta_key_iter,
+			    &data);
+	return data.err;
+}