Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / staging / rtl8192e / rtllib_crypt_tkip.c
diff --git a/kernel/drivers/staging/rtl8192e/rtllib_crypt_tkip.c b/kernel/drivers/staging/rtl8192e/rtllib_crypt_tkip.c
new file mode 100644 (file)
index 0000000..656b4b3
--- /dev/null
@@ -0,0 +1,779 @@
+/*
+ * Host AP crypt: host-based TKIP encryption implementation for Host AP driver
+ *
+ * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation. See README and COPYING for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_arp.h>
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+#include <linux/crc32.h>
+
+#include "rtllib.h"
+
+struct rtllib_tkip_data {
+#define TKIP_KEY_LEN 32
+       u8 key[TKIP_KEY_LEN];
+       int key_set;
+
+       u32 tx_iv32;
+       u16 tx_iv16;
+       u16 tx_ttak[5];
+       int tx_phase1_done;
+
+       u32 rx_iv32;
+       u16 rx_iv16;
+       bool initialized;
+       u16 rx_ttak[5];
+       int rx_phase1_done;
+       u32 rx_iv32_new;
+       u16 rx_iv16_new;
+
+       u32 dot11RSNAStatsTKIPReplays;
+       u32 dot11RSNAStatsTKIPICVErrors;
+       u32 dot11RSNAStatsTKIPLocalMICFailures;
+
+       int key_idx;
+       struct crypto_blkcipher *rx_tfm_arc4;
+       struct crypto_hash *rx_tfm_michael;
+       struct crypto_blkcipher *tx_tfm_arc4;
+       struct crypto_hash *tx_tfm_michael;
+       /* scratch buffers for virt_to_page() (crypto API) */
+       u8 rx_hdr[16], tx_hdr[16];
+};
+
+static void *rtllib_tkip_init(int key_idx)
+{
+       struct rtllib_tkip_data *priv;
+
+       priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
+       if (priv == NULL)
+               goto fail;
+       priv->key_idx = key_idx;
+       priv->tx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
+                       CRYPTO_ALG_ASYNC);
+       if (IS_ERR(priv->tx_tfm_arc4)) {
+               printk(KERN_DEBUG
+                      "rtllib_crypt_tkip: could not allocate crypto API arc4\n");
+               priv->tx_tfm_arc4 = NULL;
+               goto fail;
+       }
+
+       priv->tx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
+                       CRYPTO_ALG_ASYNC);
+       if (IS_ERR(priv->tx_tfm_michael)) {
+               printk(KERN_DEBUG
+                      "rtllib_crypt_tkip: could not allocate crypto API michael_mic\n");
+               priv->tx_tfm_michael = NULL;
+               goto fail;
+       }
+
+       priv->rx_tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)", 0,
+                       CRYPTO_ALG_ASYNC);
+       if (IS_ERR(priv->rx_tfm_arc4)) {
+               printk(KERN_DEBUG
+                      "rtllib_crypt_tkip: could not allocate crypto API arc4\n");
+               priv->rx_tfm_arc4 = NULL;
+               goto fail;
+       }
+
+       priv->rx_tfm_michael = crypto_alloc_hash("michael_mic", 0,
+                       CRYPTO_ALG_ASYNC);
+       if (IS_ERR(priv->rx_tfm_michael)) {
+               printk(KERN_DEBUG
+                      "rtllib_crypt_tkip: could not allocate crypto API michael_mic\n");
+               priv->rx_tfm_michael = NULL;
+               goto fail;
+       }
+       return priv;
+
+fail:
+       if (priv) {
+               if (priv->tx_tfm_michael)
+                       crypto_free_hash(priv->tx_tfm_michael);
+               if (priv->tx_tfm_arc4)
+                       crypto_free_blkcipher(priv->tx_tfm_arc4);
+               if (priv->rx_tfm_michael)
+                       crypto_free_hash(priv->rx_tfm_michael);
+               if (priv->rx_tfm_arc4)
+                       crypto_free_blkcipher(priv->rx_tfm_arc4);
+               kfree(priv);
+       }
+
+       return NULL;
+}
+
+
+static void rtllib_tkip_deinit(void *priv)
+{
+       struct rtllib_tkip_data *_priv = priv;
+
+       if (_priv) {
+               if (_priv->tx_tfm_michael)
+                       crypto_free_hash(_priv->tx_tfm_michael);
+               if (_priv->tx_tfm_arc4)
+                       crypto_free_blkcipher(_priv->tx_tfm_arc4);
+               if (_priv->rx_tfm_michael)
+                       crypto_free_hash(_priv->rx_tfm_michael);
+               if (_priv->rx_tfm_arc4)
+                       crypto_free_blkcipher(_priv->rx_tfm_arc4);
+       }
+       kfree(priv);
+}
+
+
+static inline u16 RotR1(u16 val)
+{
+       return (val >> 1) | (val << 15);
+}
+
+
+static inline u8 Lo8(u16 val)
+{
+       return val & 0xff;
+}
+
+
+static inline u8 Hi8(u16 val)
+{
+       return val >> 8;
+}
+
+
+static inline u16 Lo16(u32 val)
+{
+       return val & 0xffff;
+}
+
+
+static inline u16 Hi16(u32 val)
+{
+       return val >> 16;
+}
+
+
+static inline u16 Mk16(u8 hi, u8 lo)
+{
+       return lo | (((u16) hi) << 8);
+}
+
+
+static inline u16 Mk16_le(u16 *v)
+{
+       return *v;
+}
+
+
+static const u16 Sbox[256] = {
+       0xC6A5, 0xF884, 0xEE99, 0xF68D, 0xFF0D, 0xD6BD, 0xDEB1, 0x9154,
+       0x6050, 0x0203, 0xCEA9, 0x567D, 0xE719, 0xB562, 0x4DE6, 0xEC9A,
+       0x8F45, 0x1F9D, 0x8940, 0xFA87, 0xEF15, 0xB2EB, 0x8EC9, 0xFB0B,
+       0x41EC, 0xB367, 0x5FFD, 0x45EA, 0x23BF, 0x53F7, 0xE496, 0x9B5B,
+       0x75C2, 0xE11C, 0x3DAE, 0x4C6A, 0x6C5A, 0x7E41, 0xF502, 0x834F,
+       0x685C, 0x51F4, 0xD134, 0xF908, 0xE293, 0xAB73, 0x6253, 0x2A3F,
+       0x080C, 0x9552, 0x4665, 0x9D5E, 0x3028, 0x37A1, 0x0A0F, 0x2FB5,
+       0x0E09, 0x2436, 0x1B9B, 0xDF3D, 0xCD26, 0x4E69, 0x7FCD, 0xEA9F,
+       0x121B, 0x1D9E, 0x5874, 0x342E, 0x362D, 0xDCB2, 0xB4EE, 0x5BFB,
+       0xA4F6, 0x764D, 0xB761, 0x7DCE, 0x527B, 0xDD3E, 0x5E71, 0x1397,
+       0xA6F5, 0xB968, 0x0000, 0xC12C, 0x4060, 0xE31F, 0x79C8, 0xB6ED,
+       0xD4BE, 0x8D46, 0x67D9, 0x724B, 0x94DE, 0x98D4, 0xB0E8, 0x854A,
+       0xBB6B, 0xC52A, 0x4FE5, 0xED16, 0x86C5, 0x9AD7, 0x6655, 0x1194,
+       0x8ACF, 0xE910, 0x0406, 0xFE81, 0xA0F0, 0x7844, 0x25BA, 0x4BE3,
+       0xA2F3, 0x5DFE, 0x80C0, 0x058A, 0x3FAD, 0x21BC, 0x7048, 0xF104,
+       0x63DF, 0x77C1, 0xAF75, 0x4263, 0x2030, 0xE51A, 0xFD0E, 0xBF6D,
+       0x814C, 0x1814, 0x2635, 0xC32F, 0xBEE1, 0x35A2, 0x88CC, 0x2E39,
+       0x9357, 0x55F2, 0xFC82, 0x7A47, 0xC8AC, 0xBAE7, 0x322B, 0xE695,
+       0xC0A0, 0x1998, 0x9ED1, 0xA37F, 0x4466, 0x547E, 0x3BAB, 0x0B83,
+       0x8CCA, 0xC729, 0x6BD3, 0x283C, 0xA779, 0xBCE2, 0x161D, 0xAD76,
+       0xDB3B, 0x6456, 0x744E, 0x141E, 0x92DB, 0x0C0A, 0x486C, 0xB8E4,
+       0x9F5D, 0xBD6E, 0x43EF, 0xC4A6, 0x39A8, 0x31A4, 0xD337, 0xF28B,
+       0xD532, 0x8B43, 0x6E59, 0xDAB7, 0x018C, 0xB164, 0x9CD2, 0x49E0,
+       0xD8B4, 0xACFA, 0xF307, 0xCF25, 0xCAAF, 0xF48E, 0x47E9, 0x1018,
+       0x6FD5, 0xF088, 0x4A6F, 0x5C72, 0x3824, 0x57F1, 0x73C7, 0x9751,
+       0xCB23, 0xA17C, 0xE89C, 0x3E21, 0x96DD, 0x61DC, 0x0D86, 0x0F85,
+       0xE090, 0x7C42, 0x71C4, 0xCCAA, 0x90D8, 0x0605, 0xF701, 0x1C12,
+       0xC2A3, 0x6A5F, 0xAEF9, 0x69D0, 0x1791, 0x9958, 0x3A27, 0x27B9,
+       0xD938, 0xEB13, 0x2BB3, 0x2233, 0xD2BB, 0xA970, 0x0789, 0x33A7,
+       0x2DB6, 0x3C22, 0x1592, 0xC920, 0x8749, 0xAAFF, 0x5078, 0xA57A,
+       0x038F, 0x59F8, 0x0980, 0x1A17, 0x65DA, 0xD731, 0x84C6, 0xD0B8,
+       0x82C3, 0x29B0, 0x5A77, 0x1E11, 0x7BCB, 0xA8FC, 0x6DD6, 0x2C3A,
+};
+
+
+static inline u16 _S_(u16 v)
+{
+       u16 t = Sbox[Hi8(v)];
+       return Sbox[Lo8(v)] ^ ((t << 8) | (t >> 8));
+}
+
+
+#define PHASE1_LOOP_COUNT 8
+
+
+static void tkip_mixing_phase1(u16 *TTAK, const u8 *TK, const u8 *TA, u32 IV32)
+{
+       int i, j;
+
+       /* Initialize the 80-bit TTAK from TSC (IV32) and TA[0..5] */
+       TTAK[0] = Lo16(IV32);
+       TTAK[1] = Hi16(IV32);
+       TTAK[2] = Mk16(TA[1], TA[0]);
+       TTAK[3] = Mk16(TA[3], TA[2]);
+       TTAK[4] = Mk16(TA[5], TA[4]);
+
+       for (i = 0; i < PHASE1_LOOP_COUNT; i++) {
+               j = 2 * (i & 1);
+               TTAK[0] += _S_(TTAK[4] ^ Mk16(TK[1 + j], TK[0 + j]));
+               TTAK[1] += _S_(TTAK[0] ^ Mk16(TK[5 + j], TK[4 + j]));
+               TTAK[2] += _S_(TTAK[1] ^ Mk16(TK[9 + j], TK[8 + j]));
+               TTAK[3] += _S_(TTAK[2] ^ Mk16(TK[13 + j], TK[12 + j]));
+               TTAK[4] += _S_(TTAK[3] ^ Mk16(TK[1 + j], TK[0 + j])) + i;
+       }
+}
+
+
+static void tkip_mixing_phase2(u8 *WEPSeed, const u8 *TK, const u16 *TTAK,
+                              u16 IV16)
+{
+       /* Make temporary area overlap WEP seed so that the final copy can be
+        * avoided on little endian hosts.
+        */
+       u16 *PPK = (u16 *) &WEPSeed[4];
+
+       /* Step 1 - make copy of TTAK and bring in TSC */
+       PPK[0] = TTAK[0];
+       PPK[1] = TTAK[1];
+       PPK[2] = TTAK[2];
+       PPK[3] = TTAK[3];
+       PPK[4] = TTAK[4];
+       PPK[5] = TTAK[4] + IV16;
+
+       /* Step 2 - 96-bit bijective mixing using S-box */
+       PPK[0] += _S_(PPK[5] ^ Mk16_le((u16 *) &TK[0]));
+       PPK[1] += _S_(PPK[0] ^ Mk16_le((u16 *) &TK[2]));
+       PPK[2] += _S_(PPK[1] ^ Mk16_le((u16 *) &TK[4]));
+       PPK[3] += _S_(PPK[2] ^ Mk16_le((u16 *) &TK[6]));
+       PPK[4] += _S_(PPK[3] ^ Mk16_le((u16 *) &TK[8]));
+       PPK[5] += _S_(PPK[4] ^ Mk16_le((u16 *) &TK[10]));
+
+       PPK[0] += RotR1(PPK[5] ^ Mk16_le((u16 *) &TK[12]));
+       PPK[1] += RotR1(PPK[0] ^ Mk16_le((u16 *) &TK[14]));
+       PPK[2] += RotR1(PPK[1]);
+       PPK[3] += RotR1(PPK[2]);
+       PPK[4] += RotR1(PPK[3]);
+       PPK[5] += RotR1(PPK[4]);
+
+       /* Step 3 - bring in last of TK bits, assign 24-bit WEP IV value
+        * WEPSeed[0..2] is transmitted as WEP IV
+        */
+       WEPSeed[0] = Hi8(IV16);
+       WEPSeed[1] = (Hi8(IV16) | 0x20) & 0x7F;
+       WEPSeed[2] = Lo8(IV16);
+       WEPSeed[3] = Lo8((PPK[5] ^ Mk16_le((u16 *) &TK[0])) >> 1);
+
+#ifdef __BIG_ENDIAN
+       {
+               int i;
+
+               for (i = 0; i < 6; i++)
+                       PPK[i] = (PPK[i] << 8) | (PPK[i] >> 8);
+       }
+#endif
+}
+
+
+static int rtllib_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+       struct rtllib_tkip_data *tkey = priv;
+               int len;
+       u8 *pos;
+       struct rtllib_hdr_4addr *hdr;
+       struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb +
+                                   MAX_DEV_ADDR_SIZE);
+       struct blkcipher_desc desc = {.tfm = tkey->tx_tfm_arc4};
+       int ret = 0;
+       u8 rc4key[16],  *icv;
+       u32 crc;
+       struct scatterlist sg;
+
+       if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 ||
+           skb->len < hdr_len)
+               return -1;
+
+       hdr = (struct rtllib_hdr_4addr *) skb->data;
+
+       if (!tcb_desc->bHwSec) {
+               if (!tkey->tx_phase1_done) {
+                       tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2,
+                                       tkey->tx_iv32);
+                       tkey->tx_phase1_done = 1;
+               }
+               tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak,
+                                  tkey->tx_iv16);
+       } else
+       tkey->tx_phase1_done = 1;
+
+
+       len = skb->len - hdr_len;
+       pos = skb_push(skb, 8);
+       memmove(pos, pos + 8, hdr_len);
+       pos += hdr_len;
+
+       if (tcb_desc->bHwSec) {
+               *pos++ = Hi8(tkey->tx_iv16);
+               *pos++ = (Hi8(tkey->tx_iv16) | 0x20) & 0x7F;
+               *pos++ = Lo8(tkey->tx_iv16);
+       } else {
+               *pos++ = rc4key[0];
+               *pos++ = rc4key[1];
+               *pos++ = rc4key[2];
+       }
+
+       *pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */;
+       *pos++ = tkey->tx_iv32 & 0xff;
+       *pos++ = (tkey->tx_iv32 >> 8) & 0xff;
+       *pos++ = (tkey->tx_iv32 >> 16) & 0xff;
+       *pos++ = (tkey->tx_iv32 >> 24) & 0xff;
+
+       if (!tcb_desc->bHwSec) {
+               icv = skb_put(skb, 4);
+               crc = ~crc32_le(~0, pos, len);
+               icv[0] = crc;
+               icv[1] = crc >> 8;
+               icv[2] = crc >> 16;
+               icv[3] = crc >> 24;
+
+               sg_init_one(&sg, pos, len+4);
+
+
+               crypto_blkcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
+               ret = crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4);
+       }
+
+       tkey->tx_iv16++;
+       if (tkey->tx_iv16 == 0) {
+               tkey->tx_phase1_done = 0;
+               tkey->tx_iv32++;
+       }
+
+       if (!tcb_desc->bHwSec)
+               return ret;
+       else
+               return 0;
+
+
+}
+
+static int rtllib_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+       struct rtllib_tkip_data *tkey = priv;
+       u8 keyidx, *pos;
+       u32 iv32;
+       u16 iv16;
+       struct rtllib_hdr_4addr *hdr;
+       struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb +
+                                   MAX_DEV_ADDR_SIZE);
+       struct blkcipher_desc desc = {.tfm = tkey->rx_tfm_arc4};
+       u8 rc4key[16];
+       u8 icv[4];
+       u32 crc;
+       struct scatterlist sg;
+       int plen;
+
+       if (skb->len < hdr_len + 8 + 4)
+               return -1;
+
+       hdr = (struct rtllib_hdr_4addr *) skb->data;
+       pos = skb->data + hdr_len;
+       keyidx = pos[3];
+       if (!(keyidx & (1 << 5))) {
+               if (net_ratelimit()) {
+                       printk(KERN_DEBUG
+                              "TKIP: received packet without ExtIV flag from %pM\n",
+                              hdr->addr2);
+               }
+               return -2;
+       }
+       keyidx >>= 6;
+       if (tkey->key_idx != keyidx) {
+               printk(KERN_DEBUG
+                      "TKIP: RX tkey->key_idx=%d frame keyidx=%d priv=%p\n",
+                      tkey->key_idx, keyidx, priv);
+               return -6;
+       }
+       if (!tkey->key_set) {
+               if (net_ratelimit()) {
+                       printk(KERN_DEBUG
+                              "TKIP: received packet from %pM with keyid=%d that does not have a configured key\n",
+                              hdr->addr2, keyidx);
+               }
+               return -3;
+       }
+       iv16 = (pos[0] << 8) | pos[2];
+       iv32 = pos[4] | (pos[5] << 8) | (pos[6] << 16) | (pos[7] << 24);
+       pos += 8;
+
+       if (!tcb_desc->bHwSec || (skb->cb[0] == 1)) {
+               if ((iv32 < tkey->rx_iv32 ||
+                   (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) &&
+                   tkey->initialized) {
+                       if (net_ratelimit()) {
+                               printk(KERN_DEBUG
+                                      "TKIP: replay detected: STA= %pM previous TSC %08x%04x received TSC %08x%04x\n",
+                                      hdr->addr2, tkey->rx_iv32, tkey->rx_iv16,
+                                      iv32, iv16);
+                       }
+                       tkey->dot11RSNAStatsTKIPReplays++;
+                       return -4;
+               }
+               tkey->initialized = true;
+
+               if (iv32 != tkey->rx_iv32 || !tkey->rx_phase1_done) {
+                       tkip_mixing_phase1(tkey->rx_ttak, tkey->key,
+                                          hdr->addr2, iv32);
+                       tkey->rx_phase1_done = 1;
+               }
+               tkip_mixing_phase2(rc4key, tkey->key, tkey->rx_ttak, iv16);
+
+               plen = skb->len - hdr_len - 12;
+
+               sg_init_one(&sg, pos, plen+4);
+
+               crypto_blkcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16);
+               if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4)) {
+                       if (net_ratelimit()) {
+                               printk(KERN_DEBUG
+                                      ": TKIP: failed to decrypt received packet from %pM\n",
+                                      hdr->addr2);
+                       }
+                       return -7;
+               }
+
+               crc = ~crc32_le(~0, pos, plen);
+               icv[0] = crc;
+               icv[1] = crc >> 8;
+               icv[2] = crc >> 16;
+               icv[3] = crc >> 24;
+
+               if (memcmp(icv, pos + plen, 4) != 0) {
+                       if (iv32 != tkey->rx_iv32) {
+                               /* Previously cached Phase1 result was already
+                                * lost, so it needs to be recalculated for the
+                                * next packet.
+                                */
+                               tkey->rx_phase1_done = 0;
+                       }
+                       if (net_ratelimit()) {
+                               printk(KERN_DEBUG
+                                      "TKIP: ICV error detected: STA= %pM\n",
+                                      hdr->addr2);
+                       }
+                       tkey->dot11RSNAStatsTKIPICVErrors++;
+                       return -5;
+               }
+
+       }
+
+       /* Update real counters only after Michael MIC verification has
+        * completed
+        */
+       tkey->rx_iv32_new = iv32;
+       tkey->rx_iv16_new = iv16;
+
+       /* Remove IV and ICV */
+       memmove(skb->data + 8, skb->data, hdr_len);
+       skb_pull(skb, 8);
+       skb_trim(skb, skb->len - 4);
+
+       return keyidx;
+}
+
+
+static int michael_mic(struct crypto_hash *tfm_michael, u8 *key, u8 *hdr,
+                      u8 *data, size_t data_len, u8 *mic)
+{
+       struct hash_desc desc;
+       struct scatterlist sg[2];
+
+       if (tfm_michael == NULL) {
+               pr_warn("michael_mic: tfm_michael == NULL\n");
+               return -1;
+       }
+       sg_init_table(sg, 2);
+       sg_set_buf(&sg[0], hdr, 16);
+       sg_set_buf(&sg[1], data, data_len);
+
+       if (crypto_hash_setkey(tfm_michael, key, 8))
+               return -1;
+
+       desc.tfm = tfm_michael;
+       desc.flags = 0;
+       return crypto_hash_digest(&desc, sg, data_len + 16, mic);
+}
+
+static void michael_mic_hdr(struct sk_buff *skb, u8 *hdr)
+{
+       struct rtllib_hdr_4addr *hdr11;
+
+       hdr11 = (struct rtllib_hdr_4addr *) skb->data;
+       switch (le16_to_cpu(hdr11->frame_ctl) &
+               (RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS)) {
+       case RTLLIB_FCTL_TODS:
+               memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
+               memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
+               break;
+       case RTLLIB_FCTL_FROMDS:
+               memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
+               memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */
+               break;
+       case RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS:
+               memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
+               memcpy(hdr + ETH_ALEN, hdr11->addr4, ETH_ALEN); /* SA */
+               break;
+       case 0:
+               memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
+               memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
+               break;
+       }
+
+       hdr[12] = 0; /* priority */
+
+       hdr[13] = hdr[14] = hdr[15] = 0; /* reserved */
+}
+
+
+static int rtllib_michael_mic_add(struct sk_buff *skb, int hdr_len, void *priv)
+{
+       struct rtllib_tkip_data *tkey = priv;
+       u8 *pos;
+       struct rtllib_hdr_4addr *hdr;
+
+       hdr = (struct rtllib_hdr_4addr *) skb->data;
+
+       if (skb_tailroom(skb) < 8 || skb->len < hdr_len) {
+               printk(KERN_DEBUG
+                      "Invalid packet for Michael MIC add (tailroom=%d hdr_len=%d skb->len=%d)\n",
+                      skb_tailroom(skb), hdr_len, skb->len);
+               return -1;
+       }
+
+       michael_mic_hdr(skb, tkey->tx_hdr);
+
+       if (RTLLIB_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl)))
+               tkey->tx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07;
+       pos = skb_put(skb, 8);
+       if (michael_mic(tkey->tx_tfm_michael, &tkey->key[16], tkey->tx_hdr,
+           skb->data + hdr_len, skb->len - 8 - hdr_len, pos))
+               return -1;
+
+       return 0;
+}
+
+
+static void rtllib_michael_mic_failure(struct net_device *dev,
+                                      struct rtllib_hdr_4addr *hdr,
+                                      int keyidx)
+{
+       union iwreq_data wrqu;
+       struct iw_michaelmicfailure ev;
+
+       /* TODO: needed parameters: count, keyid, key type, TSC */
+       memset(&ev, 0, sizeof(ev));
+       ev.flags = keyidx & IW_MICFAILURE_KEY_ID;
+       if (hdr->addr1[0] & 0x01)
+               ev.flags |= IW_MICFAILURE_GROUP;
+       else
+               ev.flags |= IW_MICFAILURE_PAIRWISE;
+       ev.src_addr.sa_family = ARPHRD_ETHER;
+       memcpy(ev.src_addr.sa_data, hdr->addr2, ETH_ALEN);
+       memset(&wrqu, 0, sizeof(wrqu));
+       wrqu.data.length = sizeof(ev);
+       wireless_send_event(dev, IWEVMICHAELMICFAILURE, &wrqu, (char *) &ev);
+}
+
+static int rtllib_michael_mic_verify(struct sk_buff *skb, int keyidx,
+                                    int hdr_len, void *priv)
+{
+       struct rtllib_tkip_data *tkey = priv;
+       u8 mic[8];
+       struct rtllib_hdr_4addr *hdr;
+
+       hdr = (struct rtllib_hdr_4addr *) skb->data;
+
+       if (!tkey->key_set)
+               return -1;
+
+       michael_mic_hdr(skb, tkey->rx_hdr);
+       if (RTLLIB_QOS_HAS_SEQ(le16_to_cpu(hdr->frame_ctl)))
+               tkey->rx_hdr[12] = *(skb->data + hdr_len - 2) & 0x07;
+
+       if (michael_mic(tkey->rx_tfm_michael, &tkey->key[24], tkey->rx_hdr,
+                       skb->data + hdr_len, skb->len - 8 - hdr_len, mic))
+               return -1;
+
+       if (memcmp(mic, skb->data + skb->len - 8, 8) != 0) {
+               struct rtllib_hdr_4addr *hdr;
+
+               hdr = (struct rtllib_hdr_4addr *) skb->data;
+               printk(KERN_DEBUG
+                      "%s: Michael MIC verification failed for MSDU from %pM keyidx=%d\n",
+                      skb->dev ? skb->dev->name : "N/A", hdr->addr2,
+                      keyidx);
+               printk(KERN_DEBUG "%d\n",
+                      memcmp(mic, skb->data + skb->len - 8, 8) != 0);
+               if (skb->dev) {
+                       pr_info("skb->dev != NULL\n");
+                       rtllib_michael_mic_failure(skb->dev, hdr, keyidx);
+               }
+               tkey->dot11RSNAStatsTKIPLocalMICFailures++;
+               return -1;
+       }
+
+       /* Update TSC counters for RX now that the packet verification has
+        * completed.
+        */
+       tkey->rx_iv32 = tkey->rx_iv32_new;
+       tkey->rx_iv16 = tkey->rx_iv16_new;
+
+       skb_trim(skb, skb->len - 8);
+
+       return 0;
+}
+
+
+static int rtllib_tkip_set_key(void *key, int len, u8 *seq, void *priv)
+{
+       struct rtllib_tkip_data *tkey = priv;
+       int keyidx;
+       struct crypto_hash *tfm = tkey->tx_tfm_michael;
+       struct crypto_blkcipher *tfm2 = tkey->tx_tfm_arc4;
+       struct crypto_hash *tfm3 = tkey->rx_tfm_michael;
+       struct crypto_blkcipher *tfm4 = tkey->rx_tfm_arc4;
+
+       keyidx = tkey->key_idx;
+       memset(tkey, 0, sizeof(*tkey));
+       tkey->key_idx = keyidx;
+       tkey->tx_tfm_michael = tfm;
+       tkey->tx_tfm_arc4 = tfm2;
+       tkey->rx_tfm_michael = tfm3;
+       tkey->rx_tfm_arc4 = tfm4;
+
+       if (len == TKIP_KEY_LEN) {
+               memcpy(tkey->key, key, TKIP_KEY_LEN);
+               tkey->key_set = 1;
+               tkey->tx_iv16 = 1; /* TSC is initialized to 1 */
+               if (seq) {
+                       tkey->rx_iv32 = (seq[5] << 24) | (seq[4] << 16) |
+                               (seq[3] << 8) | seq[2];
+                       tkey->rx_iv16 = (seq[1] << 8) | seq[0];
+               }
+       } else if (len == 0)
+               tkey->key_set = 0;
+       else
+               return -1;
+
+       return 0;
+}
+
+
+static int rtllib_tkip_get_key(void *key, int len, u8 *seq, void *priv)
+{
+       struct rtllib_tkip_data *tkey = priv;
+
+       if (len < TKIP_KEY_LEN)
+               return -1;
+
+       if (!tkey->key_set)
+               return 0;
+       memcpy(key, tkey->key, TKIP_KEY_LEN);
+
+       if (seq) {
+               /* Return the sequence number of the last transmitted frame. */
+               u16 iv16 = tkey->tx_iv16;
+               u32 iv32 = tkey->tx_iv32;
+
+               if (iv16 == 0)
+                       iv32--;
+               iv16--;
+               seq[0] = tkey->tx_iv16;
+               seq[1] = tkey->tx_iv16 >> 8;
+               seq[2] = tkey->tx_iv32;
+               seq[3] = tkey->tx_iv32 >> 8;
+               seq[4] = tkey->tx_iv32 >> 16;
+               seq[5] = tkey->tx_iv32 >> 24;
+       }
+
+       return TKIP_KEY_LEN;
+}
+
+
+static void rtllib_tkip_print_stats(struct seq_file *m, void *priv)
+{
+       struct rtllib_tkip_data *tkip = priv;
+
+       seq_printf(m,
+                  "key[%d] alg=TKIP key_set=%d tx_pn=%02x%02x%02x%02x%02x%02x rx_pn=%02x%02x%02x%02x%02x%02x replays=%d icv_errors=%d local_mic_failures=%d\n",
+                  tkip->key_idx, tkip->key_set,
+                  (tkip->tx_iv32 >> 24) & 0xff,
+                  (tkip->tx_iv32 >> 16) & 0xff,
+                  (tkip->tx_iv32 >> 8) & 0xff,
+                  tkip->tx_iv32 & 0xff,
+                  (tkip->tx_iv16 >> 8) & 0xff,
+                  tkip->tx_iv16 & 0xff,
+                  (tkip->rx_iv32 >> 24) & 0xff,
+                  (tkip->rx_iv32 >> 16) & 0xff,
+                  (tkip->rx_iv32 >> 8) & 0xff,
+                  tkip->rx_iv32 & 0xff,
+                  (tkip->rx_iv16 >> 8) & 0xff,
+                  tkip->rx_iv16 & 0xff,
+                  tkip->dot11RSNAStatsTKIPReplays,
+                  tkip->dot11RSNAStatsTKIPICVErrors,
+                  tkip->dot11RSNAStatsTKIPLocalMICFailures);
+}
+
+static struct lib80211_crypto_ops rtllib_crypt_tkip = {
+       .name                   = "R-TKIP",
+       .init                   = rtllib_tkip_init,
+       .deinit                 = rtllib_tkip_deinit,
+       .encrypt_mpdu           = rtllib_tkip_encrypt,
+       .decrypt_mpdu           = rtllib_tkip_decrypt,
+       .encrypt_msdu           = rtllib_michael_mic_add,
+       .decrypt_msdu           = rtllib_michael_mic_verify,
+       .set_key                = rtllib_tkip_set_key,
+       .get_key                = rtllib_tkip_get_key,
+       .print_stats            = rtllib_tkip_print_stats,
+       .extra_mpdu_prefix_len = 4 + 4, /* IV + ExtIV */
+       .extra_mpdu_postfix_len = 4,    /* ICV */
+       .extra_msdu_postfix_len = 8,    /* MIC */
+       .owner                  = THIS_MODULE,
+};
+
+
+static int __init rtllib_crypto_tkip_init(void)
+{
+       return lib80211_register_crypto_ops(&rtllib_crypt_tkip);
+}
+
+
+static void __exit rtllib_crypto_tkip_exit(void)
+{
+       lib80211_unregister_crypto_ops(&rtllib_crypt_tkip);
+}
+
+module_init(rtllib_crypto_tkip_init);
+module_exit(rtllib_crypto_tkip_exit);
+
+MODULE_LICENSE("GPL");