[PATCH v9 14/24] wfx: add key.c/key.h

Jerome Pouiller
2022-01-11T17:17:31Z

From: Jérôme Pouiller <jerome.pouiller@silabs.com>

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
---
drivers/net/wireless/silabs/wfx/key.c | 227 ++++++++++++++++++++++++++
drivers/net/wireless/silabs/wfx/key.h | 19 +++
2 files changed, 246 insertions(+)
create mode 100644 drivers/net/wireless/silabs/wfx/key.c
create mode 100644 drivers/net/wireless/silabs/wfx/key.h

diff --git a/drivers/net/wireless/silabs/wfx/key.c b/drivers/net/wireless/silabs/wfx/key.c
new file mode 100644
index 000000000000..8f23e8d42bd4
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/key.c
@@ -0,0 +1,227 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Key management related functions.
+ *
+ * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ */
+#include <linux/etherdevice.h>
+#include <net/mac80211.h>
+
+#include "key.h"
+#include "wfx.h"
+#include "hif_tx_mib.h"
+
+static int wfx_alloc_key(struct wfx_dev *wdev)
+{
+ int idx;
+
+ idx = ffs(~wdev->key_map) - 1;
+ if (idx < 0 || idx >= MAX_KEY_ENTRIES)
+ return -1;
+
+ wdev->key_map |= BIT(idx);
+ return idx;
+}
+
+static void wfx_free_key(struct wfx_dev *wdev, int idx)
+{
+ WARN(!(wdev->key_map & BIT(idx)), "inconsistent key allocation");
+ wdev->key_map &= ~BIT(idx);
+}
+
+static u8 fill_wep_pair(struct wfx_hif_wep_pairwise_key *msg,
+ struct ieee80211_key_conf *key, u8 *peer_addr)
+{
+ WARN(key->keylen > sizeof(msg->key_data), "inconsistent data");
+ msg->key_length = key->keylen;
+ memcpy(msg->key_data, key->key, key->keylen);
+ ether_addr_copy(msg->peer_address, peer_addr);
+ return HIF_KEY_TYPE_WEP_PAIRWISE;
+}
+
+static u8 fill_wep_group(struct wfx_hif_wep_group_key *msg,
+ struct ieee80211_key_conf *key)
+{
+ WARN(key->keylen > sizeof(msg->key_data), "inconsistent data");
+ msg->key_id = key->keyidx;
+ msg->key_length = key->keylen;
+ memcpy(msg->key_data, key->key, key->keylen);
+ return HIF_KEY_TYPE_WEP_DEFAULT;
+}
+
+static u8 fill_tkip_pair(struct wfx_hif_tkip_pairwise_key *msg,
+ struct ieee80211_key_conf *key, u8 *peer_addr)
+{
+ u8 *keybuf = key->key;
+
+ WARN(key->keylen != sizeof(msg->tkip_key_data) + sizeof(msg->tx_mic_key) +
+ sizeof(msg->rx_mic_key), "inconsistent data");
+ memcpy(msg->tkip_key_data, keybuf, sizeof(msg->tkip_key_data));
+ keybuf += sizeof(msg->tkip_key_data);
+ memcpy(msg->tx_mic_key, keybuf, sizeof(msg->tx_mic_key));
+ keybuf += sizeof(msg->tx_mic_key);
+ memcpy(msg->rx_mic_key, keybuf, sizeof(msg->rx_mic_key));
+ ether_addr_copy(msg->peer_address, peer_addr);
+ return HIF_KEY_TYPE_TKIP_PAIRWISE;
+}
+
+static u8 fill_tkip_group(struct wfx_hif_tkip_group_key *msg, struct ieee80211_key_conf *key,
+ struct ieee80211_key_seq *seq, enum nl80211_iftype iftype)
+{
+ u8 *keybuf = key->key;
+
+ WARN(key->keylen != sizeof(msg->tkip_key_data) + 2 * sizeof(msg->rx_mic_key),
+ "inconsistent data");
+ msg->key_id = key->keyidx;
+ memcpy(msg->rx_sequence_counter, &seq->tkip.iv16, sizeof(seq->tkip.iv16));
+ memcpy(msg->rx_sequence_counter + sizeof(u16), &seq->tkip.iv32, sizeof(seq->tkip.iv32));
+ memcpy(msg->tkip_key_data, keybuf, sizeof(msg->tkip_key_data));
+ keybuf += sizeof(msg->tkip_key_data);
+ if (iftype == NL80211_IFTYPE_AP)
+ /* Use Tx MIC Key */
+ memcpy(msg->rx_mic_key, keybuf + 0, sizeof(msg->rx_mic_key));
+ else
+ /* Use Rx MIC Key */
+ memcpy(msg->rx_mic_key, keybuf + 8, sizeof(msg->rx_mic_key));
+ return HIF_KEY_TYPE_TKIP_GROUP;
+}
+
+static u8 fill_ccmp_pair(struct wfx_hif_aes_pairwise_key *msg,
+ struct ieee80211_key_conf *key, u8 *peer_addr)
+{
+ WARN(key->keylen != sizeof(msg->aes_key_data), "inconsistent data");
+ ether_addr_copy(msg->peer_address, peer_addr);
+ memcpy(msg->aes_key_data, key->key, key->keylen);
+ return HIF_KEY_TYPE_AES_PAIRWISE;
+}
+
+static u8 fill_ccmp_group(struct wfx_hif_aes_group_key *msg,
+ struct ieee80211_key_conf *key, struct ieee80211_key_seq *seq)
+{
+ WARN(key->keylen != sizeof(msg->aes_key_data), "inconsistent data");
+ memcpy(msg->aes_key_data, key->key, key->keylen);
+ memcpy(msg->rx_sequence_counter, seq->ccmp.pn, sizeof(seq->ccmp.pn));
+ memreverse(msg->rx_sequence_counter, sizeof(seq->ccmp.pn));
+ msg->key_id = key->keyidx;
+ return HIF_KEY_TYPE_AES_GROUP;
+}
+
+static u8 fill_sms4_pair(struct wfx_hif_wapi_pairwise_key *msg,
+ struct ieee80211_key_conf *key, u8 *peer_addr)
+{
+ u8 *keybuf = key->key;
+
+ WARN(key->keylen != sizeof(msg->wapi_key_data) + sizeof(msg->mic_key_data),
+ "inconsistent data");
+ ether_addr_copy(msg->peer_address, peer_addr);
+ memcpy(msg->wapi_key_data, keybuf, sizeof(msg->wapi_key_data));
+ keybuf += sizeof(msg->wapi_key_data);
+ memcpy(msg->mic_key_data, keybuf, sizeof(msg->mic_key_data));
+ msg->key_id = key->keyidx;
+ return HIF_KEY_TYPE_WAPI_PAIRWISE;
+}
+
+static u8 fill_sms4_group(struct wfx_hif_wapi_group_key *msg,
+ struct ieee80211_key_conf *key)
+{
+ u8 *keybuf = key->key;
+
+ WARN(key->keylen != sizeof(msg->wapi_key_data) + sizeof(msg->mic_key_data),
+ "inconsistent data");
+ memcpy(msg->wapi_key_data, keybuf, sizeof(msg->wapi_key_data));
+ keybuf += sizeof(msg->wapi_key_data);
+ memcpy(msg->mic_key_data, keybuf, sizeof(msg->mic_key_data));
+ msg->key_id = key->keyidx;
+ return HIF_KEY_TYPE_WAPI_GROUP;
+}
+
+static u8 fill_aes_cmac_group(struct wfx_hif_igtk_group_key *msg,
+ struct ieee80211_key_conf *key, struct ieee80211_key_seq *seq)
+{
+ WARN(key->keylen != sizeof(msg->igtk_key_data), "inconsistent data");
+ memcpy(msg->igtk_key_data, key->key, key->keylen);
+ memcpy(msg->ipn, seq->aes_cmac.pn, sizeof(seq->aes_cmac.pn));
+ memreverse(msg->ipn, sizeof(seq->aes_cmac.pn));
+ msg->key_id = key->keyidx;
+ return HIF_KEY_TYPE_IGTK_GROUP;
+}
+
+static int wfx_add_key(struct wfx_vif *wvif, struct ieee80211_sta *sta,
+ struct ieee80211_key_conf *key)
+{
+ int ret;
+ struct wfx_hif_req_add_key k = { };
+ struct ieee80211_key_seq seq;
+ struct wfx_dev *wdev = wvif->wdev;
+ int idx = wfx_alloc_key(wvif->wdev);
+ bool pairwise = key->flags & IEEE80211_KEY_FLAG_PAIRWISE;
+
+ WARN(key->flags & IEEE80211_KEY_FLAG_PAIRWISE && !sta, "inconsistent data");
+ ieee80211_get_key_rx_seq(key, 0, &seq);
+ if (idx < 0)
+ return -EINVAL;
+ k.int_id = wvif->id;
+ k.entry_index = idx;
+ if (key->cipher == WLAN_CIPHER_SUITE_WEP40 ||
+ key->cipher == WLAN_CIPHER_SUITE_WEP104) {
+ if (pairwise)
+ k.type = fill_wep_pair(&k.key.wep_pairwise_key, key, sta->addr);
+ else
+ k.type = fill_wep_group(&k.key.wep_group_key, key);
+ } else if (key->cipher == WLAN_CIPHER_SUITE_TKIP) {
+ if (pairwise)
+ k.type = fill_tkip_pair(&k.key.tkip_pairwise_key, key, sta->addr);
+ else
+ k.type = fill_tkip_group(&k.key.tkip_group_key, key, &seq,
+ wvif->vif->type);
+ } else if (key->cipher == WLAN_CIPHER_SUITE_CCMP) {
+ if (pairwise)
+ k.type = fill_ccmp_pair(&k.key.aes_pairwise_key, key, sta->addr);
+ else
+ k.type = fill_ccmp_group(&k.key.aes_group_key, key, &seq);
+ } else if (key->cipher == WLAN_CIPHER_SUITE_SMS4) {
+ if (pairwise)
+ k.type = fill_sms4_pair(&k.key.wapi_pairwise_key, key, sta->addr);
+ else
+ k.type = fill_sms4_group(&k.key.wapi_group_key, key);
+ } else if (key->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
+ k.type = fill_aes_cmac_group(&k.key.igtk_group_key, key, &seq);
+ key->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIE;
+ } else {
+ dev_warn(wdev->dev, "unsupported key type %d\n", key->cipher);
+ wfx_free_key(wdev, idx);
+ return -EOPNOTSUPP;
+ }
+ ret = wfx_hif_add_key(wdev, &k);
+ if (ret) {
+ wfx_free_key(wdev, idx);
+ return -EOPNOTSUPP;
+ }
+ key->flags |= IEEE80211_KEY_FLAG_PUT_IV_SPACE | IEEE80211_KEY_FLAG_RESERVE_TAILROOM;
+ key->hw_key_idx = idx;
+ return 0;
+}
+
+static int wfx_remove_key(struct wfx_vif *wvif, struct ieee80211_key_conf *key)
+{
+ WARN(key->hw_key_idx >= MAX_KEY_ENTRIES, "corrupted hw_key_idx");
+ wfx_free_key(wvif->wdev, key->hw_key_idx);
+ return wfx_hif_remove_key(wvif->wdev, key->hw_key_idx);
+}
+
+int wfx_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd, struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta, struct ieee80211_key_conf *key)
+{
+ int ret = -EOPNOTSUPP;
+ struct wfx_vif *wvif = (struct wfx_vif *)vif->drv_priv;
+
+ mutex_lock(&wvif->wdev->conf_mutex);
+ if (cmd == SET_KEY)
+ ret = wfx_add_key(wvif, sta, key);
+ if (cmd == DISABLE_KEY)
+ ret = wfx_remove_key(wvif, key);
+ mutex_unlock(&wvif->wdev->conf_mutex);
+ return ret;
+}
+
diff --git a/drivers/net/wireless/silabs/wfx/key.h b/drivers/net/wireless/silabs/wfx/key.h
new file mode 100644
index 000000000000..2234e36dbbcd
--- /dev/null
+++ b/drivers/net/wireless/silabs/wfx/key.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Key management related functions.
+ *
+ * Copyright (c) 2017-2020, Silicon Laboratories, Inc.
+ * Copyright (c) 2010, ST-Ericsson
+ */
+#ifndef WFX_KEY_H
+#define WFX_KEY_H
+
+#include <net/mac80211.h>
+
+struct wfx_dev;
+struct wfx_vif;
+
+int wfx_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd, struct ieee80211_vif *vif,
+ struct ieee80211_sta *sta, struct ieee80211_key_conf *key);
+
+#endif
--
2.34.1