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