1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 5 * Copyright (c) 2002-2006 Atheros Communications, Inc. 6 * 7 * Permission to use, copy, modify, and/or distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 * 19 * $FreeBSD$ 20 */ 21 #include "opt_ah.h" 22 23 #include "ah.h" 24 #include "ah_internal.h" 25 26 #include "ar5211/ar5211.h" 27 #include "ar5211/ar5211reg.h" 28 29 /* 30 * Chips-specific key cache routines. 31 */ 32 33 #define AR_KEYTABLE_SIZE 128 34 #define KEY_XOR 0xaa 35 36 /* 37 * Return the size of the hardware key cache. 38 */ 39 uint32_t 40 ar5211GetKeyCacheSize(struct ath_hal *ah) 41 { 42 return AR_KEYTABLE_SIZE; 43 } 44 45 /* 46 * Return true if the specific key cache entry is valid. 47 */ 48 HAL_BOOL 49 ar5211IsKeyCacheEntryValid(struct ath_hal *ah, uint16_t entry) 50 { 51 if (entry < AR_KEYTABLE_SIZE) { 52 uint32_t val = OS_REG_READ(ah, AR_KEYTABLE_MAC1(entry)); 53 if (val & AR_KEYTABLE_VALID) 54 return AH_TRUE; 55 } 56 return AH_FALSE; 57 } 58 59 /* 60 * Clear the specified key cache entry 61 */ 62 HAL_BOOL 63 ar5211ResetKeyCacheEntry(struct ath_hal *ah, uint16_t entry) 64 { 65 if (entry < AR_KEYTABLE_SIZE) { 66 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0); 67 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0); 68 OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0); 69 OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), 0); 70 OS_REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), 0); 71 OS_REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), 0); 72 OS_REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), 0); 73 OS_REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), 0); 74 return AH_TRUE; 75 } 76 return AH_FALSE; 77 } 78 79 /* 80 * Sets the mac part of the specified key cache entry and mark it valid. 81 */ 82 HAL_BOOL 83 ar5211SetKeyCacheEntryMac(struct ath_hal *ah, uint16_t entry, const uint8_t *mac) 84 { 85 uint32_t macHi, macLo; 86 87 if (entry >= AR_KEYTABLE_SIZE) { 88 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: entry %u out of range\n", 89 __func__, entry); 90 return AH_FALSE; 91 } 92 93 /* 94 * Set MAC address -- shifted right by 1. MacLo is 95 * the 4 MSBs, and MacHi is the 2 LSBs. 96 */ 97 if (mac != AH_NULL) { 98 macHi = (mac[5] << 8) | mac[4]; 99 macLo = (mac[3] << 24)| (mac[2] << 16) 100 | (mac[1] << 8) | mac[0]; 101 macLo >>= 1; 102 macLo |= (macHi & 1) << 31; /* carry */ 103 macHi >>= 1; 104 } else { 105 macLo = macHi = 0; 106 } 107 108 OS_REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), macLo); 109 OS_REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), macHi | AR_KEYTABLE_VALID); 110 return AH_TRUE; 111 } 112 113 /* 114 * Sets the contents of the specified key cache entry. 115 */ 116 HAL_BOOL 117 ar5211SetKeyCacheEntry(struct ath_hal *ah, uint16_t entry, 118 const HAL_KEYVAL *k, const uint8_t *mac, 119 int xorKey) 120 { 121 uint32_t key0, key1, key2, key3, key4; 122 uint32_t keyType; 123 uint32_t xorMask= xorKey ? 124 (KEY_XOR << 24 | KEY_XOR << 16 | KEY_XOR << 8 | KEY_XOR) : 0; 125 126 if (entry >= AR_KEYTABLE_SIZE) { 127 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: entry %u out of range\n", 128 __func__, entry); 129 return AH_FALSE; 130 } 131 switch (k->kv_type) { 132 case HAL_CIPHER_AES_OCB: 133 keyType = AR_KEYTABLE_TYPE_AES; 134 break; 135 case HAL_CIPHER_WEP: 136 if (k->kv_len < 40 / NBBY) { 137 HALDEBUG(ah, HAL_DEBUG_ANY, 138 "%s: WEP key length %u too small\n", 139 __func__, k->kv_len); 140 return AH_FALSE; 141 } 142 if (k->kv_len <= 40 / NBBY) 143 keyType = AR_KEYTABLE_TYPE_40; 144 else if (k->kv_len <= 104 / NBBY) 145 keyType = AR_KEYTABLE_TYPE_104; 146 else 147 keyType = AR_KEYTABLE_TYPE_128; 148 break; 149 case HAL_CIPHER_CLR: 150 keyType = AR_KEYTABLE_TYPE_CLR; 151 break; 152 default: 153 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: cipher %u not supported\n", 154 __func__, k->kv_type); 155 return AH_FALSE; 156 } 157 158 key0 = LE_READ_4(k->kv_val+0) ^ xorMask; 159 key1 = (LE_READ_2(k->kv_val+4) ^ xorMask) & 0xffff; 160 key2 = LE_READ_4(k->kv_val+6) ^ xorMask; 161 key3 = (LE_READ_2(k->kv_val+10) ^ xorMask) & 0xffff; 162 key4 = LE_READ_4(k->kv_val+12) ^ xorMask; 163 if (k->kv_len <= 104 / NBBY) 164 key4 &= 0xff; 165 166 167 /* 168 * Note: WEP key cache hardware requires that each double-word 169 * pair be written in even/odd order (since the destination is 170 * a 64-bit register). Don't reorder these writes w/o 171 * understanding this! 172 */ 173 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0); 174 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1); 175 OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2); 176 OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3); 177 OS_REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4); 178 OS_REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType); 179 return ar5211SetKeyCacheEntryMac(ah, entry, mac); 180 } 181