Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/ath/ath_hal/ar5212/ar5212_keycache.c
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1 /*- 2 * SPDX-License-Identifier: ISC 3 * 4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 5 * Copyright (c) 2002-2008 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 "ar5212/ar5212.h" 27 #include "ar5212/ar5212reg.h" 28 #include "ar5212/ar5212desc.h" 29 30 /* 31 * Note: The key cache hardware requires that each double-word 32 * pair be written in even/odd order (since the destination is 33 * a 64-bit register). Don't reorder the writes in this code 34 * w/o considering this! 35 */ 36 #define KEY_XOR 0xaa 37 38 #define IS_MIC_ENABLED(ah) \ 39 (AH5212(ah)->ah_staId1Defaults & AR_STA_ID1_CRPT_MIC_ENABLE) 40 41 /* 42 * Return the size of the hardware key cache. 43 */ 44 uint32_t 45 ar5212GetKeyCacheSize(struct ath_hal *ah) 46 { 47 return AH_PRIVATE(ah)->ah_caps.halKeyCacheSize; 48 } 49 50 /* 51 * Return true if the specific key cache entry is valid. 52 */ 53 HAL_BOOL 54 ar5212IsKeyCacheEntryValid(struct ath_hal *ah, uint16_t entry) 55 { 56 if (entry < AH_PRIVATE(ah)->ah_caps.halKeyCacheSize) { 57 uint32_t val = OS_REG_READ(ah, AR_KEYTABLE_MAC1(entry)); 58 if (val & AR_KEYTABLE_VALID) 59 return AH_TRUE; 60 } 61 return AH_FALSE; 62 } 63 64 /* 65 * Clear the specified key cache entry and any associated MIC entry. 66 */ 67 HAL_BOOL 68 ar5212ResetKeyCacheEntry(struct ath_hal *ah, uint16_t entry) 69 { 70 uint32_t keyType; 71 72 if (entry >= AH_PRIVATE(ah)->ah_caps.halKeyCacheSize) { 73 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: entry %u out of range\n", 74 __func__, entry); 75 return AH_FALSE; 76 } 77 keyType = OS_REG_READ(ah, AR_KEYTABLE_TYPE(entry)); 78 79 /* XXX why not clear key type/valid bit first? */ 80 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), 0); 81 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), 0); 82 OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), 0); 83 OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), 0); 84 OS_REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), 0); 85 OS_REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), AR_KEYTABLE_TYPE_CLR); 86 OS_REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), 0); 87 OS_REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), 0); 88 if (keyType == AR_KEYTABLE_TYPE_TKIP && IS_MIC_ENABLED(ah)) { 89 uint16_t micentry = entry+64; /* MIC goes at slot+64 */ 90 91 HALASSERT(micentry < AH_PRIVATE(ah)->ah_caps.halKeyCacheSize); 92 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), 0); 93 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), 0); 94 OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), 0); 95 OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), 0); 96 /* NB: key type and MAC are known to be ok */ 97 } 98 return AH_TRUE; 99 } 100 101 /* 102 * Sets the mac part of the specified key cache entry (and any 103 * associated MIC entry) and mark them valid. 104 * 105 * Since mac[0] is shifted off and not presented to the hardware, 106 * it does double duty as a "don't use for unicast, use for multicast 107 * matching" flag. This interface should later be extended to 108 * explicitly do that rather than overloading a bit in the MAC 109 * address. 110 */ 111 HAL_BOOL 112 ar5212SetKeyCacheEntryMac(struct ath_hal *ah, uint16_t entry, const uint8_t *mac) 113 { 114 uint32_t macHi, macLo; 115 uint32_t unicast_flag = AR_KEYTABLE_VALID; 116 117 if (entry >= AH_PRIVATE(ah)->ah_caps.halKeyCacheSize) { 118 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: entry %u out of range\n", 119 __func__, entry); 120 return AH_FALSE; 121 } 122 /* 123 * Set MAC address -- shifted right by 1. MacLo is 124 * the 4 MSBs, and MacHi is the 2 LSBs. 125 */ 126 if (mac != AH_NULL) { 127 /* 128 * AR_KEYTABLE_VALID indicates that the address is a unicast 129 * address, which must match the transmitter address for 130 * decrypting frames. 131 * Not setting this bit allows the hardware to use the key 132 * for multicast frame decryption. 133 */ 134 if (mac[0] & 0x01) 135 unicast_flag = 0; 136 137 macHi = (mac[5] << 8) | mac[4]; 138 macLo = (mac[3] << 24)| (mac[2] << 16) 139 | (mac[1] << 8) | mac[0]; 140 macLo >>= 1; 141 macLo |= (macHi & 1) << 31; /* carry */ 142 macHi >>= 1; 143 } else { 144 macLo = macHi = 0; 145 } 146 OS_REG_WRITE(ah, AR_KEYTABLE_MAC0(entry), macLo); 147 OS_REG_WRITE(ah, AR_KEYTABLE_MAC1(entry), macHi | unicast_flag); 148 return AH_TRUE; 149 } 150 151 /* 152 * Sets the contents of the specified key cache entry 153 * and any associated MIC entry. 154 */ 155 HAL_BOOL 156 ar5212SetKeyCacheEntry(struct ath_hal *ah, uint16_t entry, 157 const HAL_KEYVAL *k, const uint8_t *mac, 158 int xorKey) 159 { 160 struct ath_hal_5212 *ahp = AH5212(ah); 161 const HAL_CAPABILITIES *pCap = &AH_PRIVATE(ah)->ah_caps; 162 uint32_t key0, key1, key2, key3, key4; 163 uint32_t keyType; 164 uint32_t xorMask = xorKey ? 165 (KEY_XOR << 24 | KEY_XOR << 16 | KEY_XOR << 8 | KEY_XOR) : 0; 166 167 if (entry >= pCap->halKeyCacheSize) { 168 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: entry %u out of range\n", 169 __func__, entry); 170 return AH_FALSE; 171 } 172 switch (k->kv_type) { 173 case HAL_CIPHER_AES_OCB: 174 keyType = AR_KEYTABLE_TYPE_AES; 175 break; 176 case HAL_CIPHER_AES_CCM: 177 if (!pCap->halCipherAesCcmSupport) { 178 HALDEBUG(ah, HAL_DEBUG_ANY, 179 "%s: AES-CCM not supported by mac rev 0x%x\n", 180 __func__, AH_PRIVATE(ah)->ah_macRev); 181 return AH_FALSE; 182 } 183 keyType = AR_KEYTABLE_TYPE_CCM; 184 break; 185 case HAL_CIPHER_TKIP: 186 keyType = AR_KEYTABLE_TYPE_TKIP; 187 if (IS_MIC_ENABLED(ah) && entry+64 >= pCap->halKeyCacheSize) { 188 HALDEBUG(ah, HAL_DEBUG_ANY, 189 "%s: entry %u inappropriate for TKIP\n", 190 __func__, entry); 191 return AH_FALSE; 192 } 193 break; 194 case HAL_CIPHER_WEP: 195 if (k->kv_len < 40 / NBBY) { 196 HALDEBUG(ah, HAL_DEBUG_ANY, 197 "%s: WEP key length %u too small\n", 198 __func__, k->kv_len); 199 return AH_FALSE; 200 } 201 if (k->kv_len <= 40 / NBBY) 202 keyType = AR_KEYTABLE_TYPE_40; 203 else if (k->kv_len <= 104 / NBBY) 204 keyType = AR_KEYTABLE_TYPE_104; 205 else 206 keyType = AR_KEYTABLE_TYPE_128; 207 break; 208 case HAL_CIPHER_CLR: 209 keyType = AR_KEYTABLE_TYPE_CLR; 210 break; 211 default: 212 HALDEBUG(ah, HAL_DEBUG_ANY, "%s: cipher %u not supported\n", 213 __func__, k->kv_type); 214 return AH_FALSE; 215 } 216 217 key0 = LE_READ_4(k->kv_val+0) ^ xorMask; 218 key1 = (LE_READ_2(k->kv_val+4) ^ xorMask) & 0xffff; 219 key2 = LE_READ_4(k->kv_val+6) ^ xorMask; 220 key3 = (LE_READ_2(k->kv_val+10) ^ xorMask) & 0xffff; 221 key4 = LE_READ_4(k->kv_val+12) ^ xorMask; 222 if (k->kv_len <= 104 / NBBY) 223 key4 &= 0xff; 224 225 /* 226 * Note: key cache hardware requires that each double-word 227 * pair be written in even/odd order (since the destination is 228 * a 64-bit register). Don't reorder these writes w/o 229 * considering this! 230 */ 231 if (keyType == AR_KEYTABLE_TYPE_TKIP && IS_MIC_ENABLED(ah)) { 232 uint16_t micentry = entry+64; /* MIC goes at slot+64 */ 233 uint32_t mic0, mic1, mic2, mic3, mic4; 234 235 /* 236 * Invalidate the encrypt/decrypt key until the MIC 237 * key is installed so pending rx frames will fail 238 * with decrypt errors rather than a MIC error. 239 */ 240 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), ~key0); 241 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), ~key1); 242 OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2); 243 OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3); 244 OS_REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4); 245 OS_REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType); 246 (void) ar5212SetKeyCacheEntryMac(ah, entry, mac); 247 248 /* 249 * Write MIC entry according to new or old key layout. 250 * The MISC_MODE register is assumed already set so 251 * these writes will be handled properly (happens on 252 * attach and at every reset). 253 */ 254 /* RX mic */ 255 mic0 = LE_READ_4(k->kv_mic+0); 256 mic2 = LE_READ_4(k->kv_mic+4); 257 if (ahp->ah_miscMode & AR_MISC_MODE_MIC_NEW_LOC_ENABLE) { 258 /* 259 * Both RX and TX mic values can be combined into 260 * one cache slot entry: 261 * 8*N + 800 31:0 RX Michael key 0 262 * 8*N + 804 15:0 TX Michael key 0 [31:16] 263 * 8*N + 808 31:0 RX Michael key 1 264 * 8*N + 80C 15:0 TX Michael key 0 [15:0] 265 * 8*N + 810 31:0 TX Michael key 1 266 * 8*N + 814 15:0 reserved 267 * 8*N + 818 31:0 reserved 268 * 8*N + 81C 14:0 reserved 269 * 15 key valid == 0 270 */ 271 /* TX mic */ 272 mic1 = LE_READ_2(k->kv_txmic+2) & 0xffff; 273 mic3 = LE_READ_2(k->kv_txmic+0) & 0xffff; 274 mic4 = LE_READ_4(k->kv_txmic+4); 275 } else { 276 mic1 = mic3 = mic4 = 0; 277 } 278 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(micentry), mic0); 279 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(micentry), mic1); 280 OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(micentry), mic2); 281 OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(micentry), mic3); 282 OS_REG_WRITE(ah, AR_KEYTABLE_KEY4(micentry), mic4); 283 OS_REG_WRITE(ah, AR_KEYTABLE_TYPE(micentry), 284 AR_KEYTABLE_TYPE_CLR); 285 /* NB: MIC key is not marked valid and has no MAC address */ 286 OS_REG_WRITE(ah, AR_KEYTABLE_MAC0(micentry), 0); 287 OS_REG_WRITE(ah, AR_KEYTABLE_MAC1(micentry), 0); 288 289 /* correct intentionally corrupted key */ 290 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0); 291 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1); 292 } else { 293 OS_REG_WRITE(ah, AR_KEYTABLE_KEY0(entry), key0); 294 OS_REG_WRITE(ah, AR_KEYTABLE_KEY1(entry), key1); 295 OS_REG_WRITE(ah, AR_KEYTABLE_KEY2(entry), key2); 296 OS_REG_WRITE(ah, AR_KEYTABLE_KEY3(entry), key3); 297 OS_REG_WRITE(ah, AR_KEYTABLE_KEY4(entry), key4); 298 OS_REG_WRITE(ah, AR_KEYTABLE_TYPE(entry), keyType); 299 300 (void) ar5212SetKeyCacheEntryMac(ah, entry, mac); 301 } 302 return AH_TRUE; 303 }
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