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    Subject[PATCH v2 14/24] wfx: add key.c/key.h
    Date
    From: Jérôme Pouiller <jerome.pouiller@silabs.com>

    Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
    ---
    drivers/net/wireless/silabs/wfx/key.c | 241 ++++++++++++++++++++++++++
    drivers/net/wireless/silabs/wfx/key.h | 20 +++
    2 files changed, 261 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..2ab82bed4c1b
    --- /dev/null
    +++ b/drivers/net/wireless/silabs/wfx/key.c
    @@ -0,0 +1,241 @@
    +// 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 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 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 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 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 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 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 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 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 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 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 = 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 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..70a44d0ca35e
    --- /dev/null
    +++ b/drivers/net/wireless/silabs/wfx/key.h
    @@ -0,0 +1,20 @@
    +/* SPDX-License-Identifier: GPL-2.0-only */
    +/*
    + * Implementation of mac80211 API.
    + *
    + * 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 /* WFX_STA_H */
    --
    2.28.0
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