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Miller" , devicetree@vger.kernel.org, Rob Herring , =?utf-8?b?SsOpcsO0bWUgUG91aWxsZXI=?= Subject: [PATCH 13/23] wfx: add key.c/key.h Date: Mon, 12 Oct 2020 12:46:38 +0200 Message-Id: <20201012104648.985256-14-Jerome.Pouiller@silabs.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201012104648.985256-1-Jerome.Pouiller@silabs.com> References: <20201012104648.985256-1-Jerome.Pouiller@silabs.com> X-Originating-IP: [82.67.86.106] X-ClientProxiedBy: PR3P189CA0005.EURP189.PROD.OUTLOOK.COM (2603:10a6:102:52::10) To SN6PR11MB2718.namprd11.prod.outlook.com (2603:10b6:805:63::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pc-42.home (82.67.86.106) by PR3P189CA0005.EURP189.PROD.OUTLOOK.COM (2603:10a6:102:52::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3455.21 via Frontend Transport; Mon, 12 Oct 2020 10:47:28 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 1464c064-32dd-48ab-4d03-08d86e9c379e X-MS-TrafficTypeDiagnostic: SA0PR11MB4734: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:376; 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+ + 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 + +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 */