/*
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* Copyright (c) 2009 Atheros Communications Inc.
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* Copyright (c) 2010 Bruno Randolf <br1@einfach.org>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <linux/export.h>
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#include <asm/unaligned.h>
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#include <net/mac80211.h>
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#include "ath.h"
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#include "reg.h"
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#define REG_READ (common->ops->read)
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#define REG_WRITE(_ah, _reg, _val) (common->ops->write)(_ah, _val, _reg)
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#define ENABLE_REGWRITE_BUFFER(_ah) \
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if (common->ops->enable_write_buffer) \
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common->ops->enable_write_buffer((_ah));
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#define REGWRITE_BUFFER_FLUSH(_ah) \
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if (common->ops->write_flush) \
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common->ops->write_flush((_ah));
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|
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#define IEEE80211_WEP_NKID 4 /* number of key ids */
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/************************/
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/* Key Cache Management */
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/************************/
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bool ath_hw_keyreset(struct ath_common *common, u16 entry)
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{
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u32 keyType;
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void *ah = common->ah;
|
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if (entry >= common->keymax) {
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ath_err(common, "keyreset: keycache entry %u out of range\n",
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entry);
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return false;
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}
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keyType = REG_READ(ah, AR_KEYTABLE_TYPE(entry));
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ENABLE_REGWRITE_BUFFER(ah);
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REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0);
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REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0);
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REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0);
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REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), 0);
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REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), 0);
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REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), AR_KEYTABLE_TYPE_CLR);
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REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), 0);
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REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), 0);
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if (keyType == AR_KEYTABLE_TYPE_TKIP) {
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u16 micentry = entry + 64;
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REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), 0);
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REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0);
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REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), 0);
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REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0);
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if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) {
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REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0);
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REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
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AR_KEYTABLE_TYPE_CLR);
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}
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}
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REGWRITE_BUFFER_FLUSH(ah);
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return true;
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}
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EXPORT_SYMBOL(ath_hw_keyreset);
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bool ath_hw_keysetmac(struct ath_common *common, u16 entry, const u8 *mac)
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{
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u32 macHi, macLo;
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u32 unicast_flag = AR_KEYTABLE_VALID;
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void *ah = common->ah;
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if (entry >= common->keymax) {
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ath_err(common, "keysetmac: keycache entry %u out of range\n",
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entry);
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return false;
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}
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if (mac != NULL) {
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/*
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* AR_KEYTABLE_VALID indicates that the address is a unicast
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* address, which must match the transmitter address for
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* decrypting frames.
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* Not setting this bit allows the hardware to use the key
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* for multicast frame decryption.
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*/
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if (mac[0] & 0x01)
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unicast_flag = 0;
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macLo = get_unaligned_le32(mac);
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macHi = get_unaligned_le16(mac + 4);
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macLo >>= 1;
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macLo |= (macHi & 1) << 31;
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macHi >>= 1;
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} else {
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macLo = macHi = 0;
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}
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ENABLE_REGWRITE_BUFFER(ah);
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REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), macLo);
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REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), macHi | unicast_flag);
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REGWRITE_BUFFER_FLUSH(ah);
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return true;
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}
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EXPORT_SYMBOL(ath_hw_keysetmac);
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static bool ath_hw_set_keycache_entry(struct ath_common *common, u16 entry,
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const struct ath_keyval *k,
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const u8 *mac)
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{
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void *ah = common->ah;
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u32 key0, key1, key2, key3, key4;
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u32 keyType;
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if (entry >= common->keymax) {
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ath_err(common, "set-entry: keycache entry %u out of range\n",
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entry);
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return false;
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}
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switch (k->kv_type) {
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case ATH_CIPHER_AES_OCB:
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keyType = AR_KEYTABLE_TYPE_AES;
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break;
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case ATH_CIPHER_AES_CCM:
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if (!(common->crypt_caps & ATH_CRYPT_CAP_CIPHER_AESCCM)) {
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ath_dbg(common, ANY,
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"AES-CCM not supported by this mac rev\n");
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return false;
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}
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keyType = AR_KEYTABLE_TYPE_CCM;
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break;
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case ATH_CIPHER_TKIP:
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keyType = AR_KEYTABLE_TYPE_TKIP;
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if (entry + 64 >= common->keymax) {
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ath_dbg(common, ANY,
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"entry %u inappropriate for TKIP\n", entry);
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return false;
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}
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break;
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case ATH_CIPHER_WEP:
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if (k->kv_len < WLAN_KEY_LEN_WEP40) {
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ath_dbg(common, ANY, "WEP key length %u too small\n",
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k->kv_len);
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return false;
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}
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if (k->kv_len <= WLAN_KEY_LEN_WEP40)
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keyType = AR_KEYTABLE_TYPE_40;
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else if (k->kv_len <= WLAN_KEY_LEN_WEP104)
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keyType = AR_KEYTABLE_TYPE_104;
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else
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keyType = AR_KEYTABLE_TYPE_128;
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break;
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case ATH_CIPHER_CLR:
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keyType = AR_KEYTABLE_TYPE_CLR;
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break;
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default:
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ath_err(common, "cipher %u not supported\n", k->kv_type);
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return false;
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}
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key0 = get_unaligned_le32(k->kv_val + 0);
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key1 = get_unaligned_le16(k->kv_val + 4);
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key2 = get_unaligned_le32(k->kv_val + 6);
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key3 = get_unaligned_le16(k->kv_val + 10);
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key4 = get_unaligned_le32(k->kv_val + 12);
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if (k->kv_len <= WLAN_KEY_LEN_WEP104)
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key4 &= 0xff;
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/*
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* Note: Key cache registers access special memory area that requires
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* two 32-bit writes to actually update the values in the internal
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* memory. Consequently, the exact order and pairs used here must be
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* maintained.
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*/
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if (keyType == AR_KEYTABLE_TYPE_TKIP) {
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u16 micentry = entry + 64;
|
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/*
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* Write inverted key[47:0] first to avoid Michael MIC errors
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* on frames that could be sent or received at the same time.
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* The correct key will be written in the end once everything
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* else is ready.
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*/
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REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), ~key0);
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REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), ~key1);
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/* Write key[95:48] */
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REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2);
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REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3);
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/* Write key[127:96] and key type */
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REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4);
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REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType);
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/* Write MAC address for the entry */
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(void) ath_hw_keysetmac(common, entry, mac);
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if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) {
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/*
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* TKIP uses two key cache entries:
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* Michael MIC TX/RX keys in the same key cache entry
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* (idx = main index + 64):
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* key0 [31:0] = RX key [31:0]
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* key1 [15:0] = TX key [31:16]
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* key1 [31:16] = reserved
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* key2 [31:0] = RX key [63:32]
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* key3 [15:0] = TX key [15:0]
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* key3 [31:16] = reserved
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* key4 [31:0] = TX key [63:32]
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*/
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u32 mic0, mic1, mic2, mic3, mic4;
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mic0 = get_unaligned_le32(k->kv_mic + 0);
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mic2 = get_unaligned_le32(k->kv_mic + 4);
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mic1 = get_unaligned_le16(k->kv_txmic + 2) & 0xffff;
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mic3 = get_unaligned_le16(k->kv_txmic + 0) & 0xffff;
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mic4 = get_unaligned_le32(k->kv_txmic + 4);
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ENABLE_REGWRITE_BUFFER(ah);
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/* Write RX[31:0] and TX[31:16] */
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REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0);
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REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), mic1);
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/* Write RX[63:32] and TX[15:0] */
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REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2);
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REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), mic3);
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/* Write TX[63:32] and keyType(reserved) */
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REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), mic4);
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REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
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AR_KEYTABLE_TYPE_CLR);
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REGWRITE_BUFFER_FLUSH(ah);
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} else {
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/*
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* TKIP uses four key cache entries (two for group
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* keys):
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* Michael MIC TX/RX keys are in different key cache
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* entries (idx = main index + 64 for TX and
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* main index + 32 + 96 for RX):
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* key0 [31:0] = TX/RX MIC key [31:0]
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* key1 [31:0] = reserved
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* key2 [31:0] = TX/RX MIC key [63:32]
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* key3 [31:0] = reserved
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* key4 [31:0] = reserved
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*
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* Upper layer code will call this function separately
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* for TX and RX keys when these registers offsets are
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* used.
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*/
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u32 mic0, mic2;
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mic0 = get_unaligned_le32(k->kv_mic + 0);
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mic2 = get_unaligned_le32(k->kv_mic + 4);
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ENABLE_REGWRITE_BUFFER(ah);
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/* Write MIC key[31:0] */
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REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0);
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REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0);
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/* Write MIC key[63:32] */
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REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2);
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REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0);
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/* Write TX[63:32] and keyType(reserved) */
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REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), 0);
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REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry),
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AR_KEYTABLE_TYPE_CLR);
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REGWRITE_BUFFER_FLUSH(ah);
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}
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ENABLE_REGWRITE_BUFFER(ah);
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/* MAC address registers are reserved for the MIC entry */
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REG_WRITE(ah, AR_KEYTABLE_MAC0(micentry), 0);
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REG_WRITE(ah, AR_KEYTABLE_MAC1(micentry), 0);
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/*
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* Write the correct (un-inverted) key[47:0] last to enable
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* TKIP now that all other registers are set with correct
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* values.
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*/
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REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0);
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REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1);
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REGWRITE_BUFFER_FLUSH(ah);
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} else {
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ENABLE_REGWRITE_BUFFER(ah);
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/* Write key[47:0] */
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REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0);
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REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1);
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/* Write key[95:48] */
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REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2);
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REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3);
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/* Write key[127:96] and key type */
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REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4);
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REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType);
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REGWRITE_BUFFER_FLUSH(ah);
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/* Write MAC address for the entry */
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(void) ath_hw_keysetmac(common, entry, mac);
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}
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return true;
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}
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static int ath_setkey_tkip(struct ath_common *common, u16 keyix, const u8 *key,
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struct ath_keyval *hk, const u8 *addr,
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bool authenticator)
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{
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const u8 *key_rxmic;
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const u8 *key_txmic;
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key_txmic = key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
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key_rxmic = key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
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if (addr == NULL) {
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/*
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* Group key installation - only two key cache entries are used
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* regardless of splitmic capability since group key is only
|
* used either for TX or RX.
|
*/
|
if (authenticator) {
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memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_mic));
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} else {
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memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
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memcpy(hk->kv_txmic, key_rxmic, sizeof(hk->kv_mic));
|
}
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return ath_hw_set_keycache_entry(common, keyix, hk, addr);
|
}
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if (common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) {
|
/* TX and RX keys share the same key cache entry. */
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memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
|
memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
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return ath_hw_set_keycache_entry(common, keyix, hk, addr);
|
}
|
|
/* Separate key cache entries for TX and RX */
|
|
/* TX key goes at first index, RX key at +32. */
|
memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
|
if (!ath_hw_set_keycache_entry(common, keyix, hk, NULL)) {
|
/* TX MIC entry failed. No need to proceed further */
|
ath_err(common, "Setting TX MIC Key Failed\n");
|
return 0;
|
}
|
|
memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
|
/* XXX delete tx key on failure? */
|
return ath_hw_set_keycache_entry(common, keyix + 32, hk, addr);
|
}
|
|
static int ath_reserve_key_cache_slot_tkip(struct ath_common *common)
|
{
|
int i;
|
|
for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
|
if (test_bit(i, common->keymap) ||
|
test_bit(i + 64, common->keymap))
|
continue; /* At least one part of TKIP key allocated */
|
if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED) &&
|
(test_bit(i + 32, common->keymap) ||
|
test_bit(i + 64 + 32, common->keymap)))
|
continue; /* At least one part of TKIP key allocated */
|
|
/* Found a free slot for a TKIP key */
|
return i;
|
}
|
return -1;
|
}
|
|
static int ath_reserve_key_cache_slot(struct ath_common *common,
|
u32 cipher)
|
{
|
int i;
|
|
if (cipher == WLAN_CIPHER_SUITE_TKIP)
|
return ath_reserve_key_cache_slot_tkip(common);
|
|
/* First, try to find slots that would not be available for TKIP. */
|
if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) {
|
for (i = IEEE80211_WEP_NKID; i < common->keymax / 4; i++) {
|
if (!test_bit(i, common->keymap) &&
|
(test_bit(i + 32, common->keymap) ||
|
test_bit(i + 64, common->keymap) ||
|
test_bit(i + 64 + 32, common->keymap)))
|
return i;
|
if (!test_bit(i + 32, common->keymap) &&
|
(test_bit(i, common->keymap) ||
|
test_bit(i + 64, common->keymap) ||
|
test_bit(i + 64 + 32, common->keymap)))
|
return i + 32;
|
if (!test_bit(i + 64, common->keymap) &&
|
(test_bit(i , common->keymap) ||
|
test_bit(i + 32, common->keymap) ||
|
test_bit(i + 64 + 32, common->keymap)))
|
return i + 64;
|
if (!test_bit(i + 64 + 32, common->keymap) &&
|
(test_bit(i, common->keymap) ||
|
test_bit(i + 32, common->keymap) ||
|
test_bit(i + 64, common->keymap)))
|
return i + 64 + 32;
|
}
|
} else {
|
for (i = IEEE80211_WEP_NKID; i < common->keymax / 2; i++) {
|
if (!test_bit(i, common->keymap) &&
|
test_bit(i + 64, common->keymap))
|
return i;
|
if (test_bit(i, common->keymap) &&
|
!test_bit(i + 64, common->keymap))
|
return i + 64;
|
}
|
}
|
|
/* No partially used TKIP slots, pick any available slot */
|
for (i = IEEE80211_WEP_NKID; i < common->keymax; i++) {
|
/* Do not allow slots that could be needed for TKIP group keys
|
* to be used. This limitation could be removed if we know that
|
* TKIP will not be used. */
|
if (i >= 64 && i < 64 + IEEE80211_WEP_NKID)
|
continue;
|
if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) {
|
if (i >= 32 && i < 32 + IEEE80211_WEP_NKID)
|
continue;
|
if (i >= 64 + 32 && i < 64 + 32 + IEEE80211_WEP_NKID)
|
continue;
|
}
|
|
if (!test_bit(i, common->keymap))
|
return i; /* Found a free slot for a key */
|
}
|
|
/* No free slot found */
|
return -1;
|
}
|
|
/*
|
* Configure encryption in the HW.
|
*/
|
int ath_key_config(struct ath_common *common,
|
struct ieee80211_vif *vif,
|
struct ieee80211_sta *sta,
|
struct ieee80211_key_conf *key)
|
{
|
struct ath_keyval hk;
|
const u8 *mac = NULL;
|
u8 gmac[ETH_ALEN];
|
int ret = 0;
|
int idx;
|
|
memset(&hk, 0, sizeof(hk));
|
|
switch (key->cipher) {
|
case 0:
|
hk.kv_type = ATH_CIPHER_CLR;
|
break;
|
case WLAN_CIPHER_SUITE_WEP40:
|
case WLAN_CIPHER_SUITE_WEP104:
|
hk.kv_type = ATH_CIPHER_WEP;
|
break;
|
case WLAN_CIPHER_SUITE_TKIP:
|
hk.kv_type = ATH_CIPHER_TKIP;
|
break;
|
case WLAN_CIPHER_SUITE_CCMP:
|
hk.kv_type = ATH_CIPHER_AES_CCM;
|
break;
|
default:
|
return -EOPNOTSUPP;
|
}
|
|
hk.kv_len = key->keylen;
|
if (key->keylen)
|
memcpy(&hk.kv_values, key->key, key->keylen);
|
|
if (!(key->flags & IEEE80211_KEY_FLAG_PAIRWISE)) {
|
switch (vif->type) {
|
case NL80211_IFTYPE_AP:
|
memcpy(gmac, vif->addr, ETH_ALEN);
|
gmac[0] |= 0x01;
|
mac = gmac;
|
idx = ath_reserve_key_cache_slot(common, key->cipher);
|
break;
|
case NL80211_IFTYPE_ADHOC:
|
if (!sta) {
|
idx = key->keyidx;
|
break;
|
}
|
memcpy(gmac, sta->addr, ETH_ALEN);
|
gmac[0] |= 0x01;
|
mac = gmac;
|
idx = ath_reserve_key_cache_slot(common, key->cipher);
|
break;
|
default:
|
idx = key->keyidx;
|
break;
|
}
|
} else if (key->keyidx) {
|
if (WARN_ON(!sta))
|
return -EOPNOTSUPP;
|
mac = sta->addr;
|
|
if (vif->type != NL80211_IFTYPE_AP) {
|
/* Only keyidx 0 should be used with unicast key, but
|
* allow this for client mode for now. */
|
idx = key->keyidx;
|
} else
|
return -EIO;
|
} else {
|
if (WARN_ON(!sta))
|
return -EOPNOTSUPP;
|
mac = sta->addr;
|
|
idx = ath_reserve_key_cache_slot(common, key->cipher);
|
}
|
|
if (idx < 0)
|
return -ENOSPC; /* no free key cache entries */
|
|
if (key->cipher == WLAN_CIPHER_SUITE_TKIP)
|
ret = ath_setkey_tkip(common, idx, key->key, &hk, mac,
|
vif->type == NL80211_IFTYPE_AP);
|
else
|
ret = ath_hw_set_keycache_entry(common, idx, &hk, mac);
|
|
if (!ret)
|
return -EIO;
|
|
set_bit(idx, common->keymap);
|
if (key->cipher == WLAN_CIPHER_SUITE_CCMP)
|
set_bit(idx, common->ccmp_keymap);
|
|
if (key->cipher == WLAN_CIPHER_SUITE_TKIP) {
|
set_bit(idx + 64, common->keymap);
|
set_bit(idx, common->tkip_keymap);
|
set_bit(idx + 64, common->tkip_keymap);
|
if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) {
|
set_bit(idx + 32, common->keymap);
|
set_bit(idx + 64 + 32, common->keymap);
|
set_bit(idx + 32, common->tkip_keymap);
|
set_bit(idx + 64 + 32, common->tkip_keymap);
|
}
|
}
|
|
return idx;
|
}
|
EXPORT_SYMBOL(ath_key_config);
|
|
/*
|
* Delete Key.
|
*/
|
void ath_key_delete(struct ath_common *common, u8 hw_key_idx)
|
{
|
/* Leave CCMP and TKIP (main key) configured to avoid disabling
|
* encryption for potentially pending frames already in a TXQ with the
|
* keyix pointing to this key entry. Instead, only clear the MAC address
|
* to prevent RX processing from using this key cache entry.
|
*/
|
if (test_bit(hw_key_idx, common->ccmp_keymap) ||
|
test_bit(hw_key_idx, common->tkip_keymap))
|
ath_hw_keysetmac(common, hw_key_idx, NULL);
|
else
|
ath_hw_keyreset(common, hw_key_idx);
|
if (hw_key_idx < IEEE80211_WEP_NKID)
|
return;
|
|
clear_bit(hw_key_idx, common->keymap);
|
clear_bit(hw_key_idx, common->ccmp_keymap);
|
if (!test_bit(hw_key_idx, common->tkip_keymap))
|
return;
|
|
clear_bit(hw_key_idx + 64, common->keymap);
|
|
clear_bit(hw_key_idx, common->tkip_keymap);
|
clear_bit(hw_key_idx + 64, common->tkip_keymap);
|
|
if (!(common->crypt_caps & ATH_CRYPT_CAP_MIC_COMBINED)) {
|
ath_hw_keyreset(common, hw_key_idx + 32);
|
clear_bit(hw_key_idx + 32, common->keymap);
|
clear_bit(hw_key_idx + 64 + 32, common->keymap);
|
|
clear_bit(hw_key_idx + 32, common->tkip_keymap);
|
clear_bit(hw_key_idx + 64 + 32, common->tkip_keymap);
|
}
|
}
|
EXPORT_SYMBOL(ath_key_delete);
|
