[NET] ieee80211 subsystem

Contributors:
Host AP contributors
James Ketrenos <jketreno@linux.intel.com>
Francois Romieu <romieu@fr.zoreil.com>
Adrian Bunk <bunk@stusta.de>
Matthew Galgoci <mgalgoci@parcelfarce.linux.th
eplanet.co.uk>

1 files changed, 708 insertions, 0 deletions

diff --git a/net/ieee80211/ieee80211_crypt_tkip.c b/net/ieee80211/ieee80211_crypt_tkip.c
new file mode 100644
index 000000000000..f91d92c6df25
--- /dev/null
+++ b/net/ieee80211/ieee80211_crypt_tkip.c
@@ -0,0 +1,708 @@
+/*
+ * 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/config.h>
+#include <linux/version.h>
+#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 <asm/string.h>
+
+#include <net/ieee80211.h>
+
+
+#include <linux/crypto.h>
+#include <asm/scatterlist.h>
+#include <linux/crc32.h>
+
+MODULE_AUTHOR("Jouni Malinen");
+MODULE_DESCRIPTION("Host AP crypt: TKIP");
+MODULE_LICENSE("GPL");
+
+struct ieee80211_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;
+        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_tfm *tfm_arc4;
+        struct crypto_tfm *tfm_michael;
+
+        /* scratch buffers for virt_to_page() (crypto API) */
+        u8 rx_hdr[16], tx_hdr[16];
+};
+
+static void * ieee80211_tkip_init(int key_idx)
+{
+        struct ieee80211_tkip_data *priv;
+
+        priv = kmalloc(sizeof(*priv), GFP_ATOMIC);
+        if (priv == NULL)
+                goto fail;
+        memset(priv, 0, sizeof(*priv));
+        priv->key_idx = key_idx;
+
+        priv->tfm_arc4 = crypto_alloc_tfm("arc4", 0);
+        if (priv->tfm_arc4 == NULL) {
+                printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
+                       "crypto API arc4\n");
+                goto fail;
+        }
+
+        priv->tfm_michael = crypto_alloc_tfm("michael_mic", 0);
+        if (priv->tfm_michael == NULL) {
+                printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
+                       "crypto API michael_mic\n");
+                goto fail;
+        }
+
+        return priv;
+
+fail:
+        if (priv) {
+                if (priv->tfm_michael)
+                        crypto_free_tfm(priv->tfm_michael);
+                if (priv->tfm_arc4)
+                        crypto_free_tfm(priv->tfm_arc4);
+                kfree(priv);
+        }
+
+        return NULL;
+}
+
+
+static void ieee80211_tkip_deinit(void *priv)
+{
+        struct ieee80211_tkip_data *_priv = priv;
+        if (_priv && _priv->tfm_michael)
+                crypto_free_tfm(_priv->tfm_michael);
+        if (_priv && _priv->tfm_arc4)
+                crypto_free_tfm(_priv->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 le16_to_cpu(*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 ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+        struct ieee80211_tkip_data *tkey = priv;
+        int len;
+        u8 rc4key[16], *pos, *icv;
+        struct ieee80211_hdr *hdr;
+        u32 crc;
+        struct scatterlist sg;
+
+        if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 ||
+            skb->len < hdr_len)
+                return -1;
+
+        hdr = (struct ieee80211_hdr *) skb->data;
+        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);
+
+        len = skb->len - hdr_len;
+        pos = skb_push(skb, 8);
+        memmove(pos, pos + 8, hdr_len);
+        pos += hdr_len;
+        icv = skb_put(skb, 4);
+
+        *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;
+
+        crc = ~crc32_le(~0, pos, len);
+        icv[0] = crc;
+        icv[1] = crc >> 8;
+        icv[2] = crc >> 16;
+        icv[3] = crc >> 24;
+
+        crypto_cipher_setkey(tkey->tfm_arc4, rc4key, 16);
+        sg.page = virt_to_page(pos);
+        sg.offset = offset_in_page(pos);
+        sg.length = len + 4;
+        crypto_cipher_encrypt(tkey->tfm_arc4, &sg, &sg, len + 4);
+
+        tkey->tx_iv16++;
+        if (tkey->tx_iv16 == 0) {
+                tkey->tx_phase1_done = 0;
+                tkey->tx_iv32++;
+        }
+
+        return 0;
+}
+
+static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+        struct ieee80211_tkip_data *tkey = priv;
+        u8 rc4key[16];
+        u8 keyidx, *pos;
+        u32 iv32;
+        u16 iv16;
+        struct ieee80211_hdr *hdr;
+        u8 icv[4];
+        u32 crc;
+        struct scatterlist sg;
+        int plen;
+
+        if (skb->len < hdr_len + 8 + 4)
+                return -1;
+
+        hdr = (struct ieee80211_hdr *) 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 " MAC_FMT "\n", MAC_ARG(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 " MAC_FMT
+                               " with keyid=%d that does not have a configured"
+                               " key\n", MAC_ARG(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 (iv32 < tkey->rx_iv32 ||
+            (iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) {
+                if (net_ratelimit()) {
+                        printk(KERN_DEBUG "TKIP: replay detected: STA=" MAC_FMT
+                               " previous TSC %08x%04x received TSC "
+                               "%08x%04x\n", MAC_ARG(hdr->addr2),
+                               tkey->rx_iv32, tkey->rx_iv16, iv32, iv16);
+                }
+                tkey->dot11RSNAStatsTKIPReplays++;
+                return -4;
+        }
+
+        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;
+
+        crypto_cipher_setkey(tkey->tfm_arc4, rc4key, 16);
+        sg.page = virt_to_page(pos);
+        sg.offset = offset_in_page(pos);
+        sg.length = plen + 4;
+        crypto_cipher_decrypt(tkey->tfm_arc4, &sg, &sg, plen + 4);
+
+        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="
+                               MAC_FMT "\n", MAC_ARG(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 ieee80211_tkip_data *tkey, u8 *key, u8 *hdr,
+                       u8 *data, size_t data_len, u8 *mic)
+{
+        struct scatterlist sg[2];
+
+        if (tkey->tfm_michael == NULL) {
+                printk(KERN_WARNING "michael_mic: tfm_michael == NULL\n");
+                return -1;
+        }
+        sg[0].page = virt_to_page(hdr);
+        sg[0].offset = offset_in_page(hdr);
+        sg[0].length = 16;
+
+        sg[1].page = virt_to_page(data);
+        sg[1].offset = offset_in_page(data);
+        sg[1].length = data_len;
+
+        crypto_digest_init(tkey->tfm_michael);
+        crypto_digest_setkey(tkey->tfm_michael, key, 8);
+        crypto_digest_update(tkey->tfm_michael, sg, 2);
+        crypto_digest_final(tkey->tfm_michael, mic);
+
+        return 0;
+}
+
+static void michael_mic_hdr(struct sk_buff *skb, u8 *hdr)
+{
+        struct ieee80211_hdr *hdr11;
+
+        hdr11 = (struct ieee80211_hdr *) skb->data;
+        switch (le16_to_cpu(hdr11->frame_ctl) &
+                (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
+        case IEEE80211_FCTL_TODS:
+                memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */
+                memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */
+                break;
+        case IEEE80211_FCTL_FROMDS:
+                memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */
+                memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */
+                break;
+        case IEEE80211_FCTL_FROMDS | IEEE80211_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 ieee80211_michael_mic_add(struct sk_buff *skb, int hdr_len, void *priv)
+{
+        struct ieee80211_tkip_data *tkey = priv;
+        u8 *pos;
+
+        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);
+        pos = skb_put(skb, 8);
+        if (michael_mic(tkey, &tkey->key[16], tkey->tx_hdr,
+                        skb->data + hdr_len, skb->len - 8 - hdr_len, pos))
+                return -1;
+
+        return 0;
+}
+
+
+#if WIRELESS_EXT >= 18
+static void ieee80211_michael_mic_failure(struct net_device *dev,
+                                       struct ieee80211_hdr *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);
+}
+#elif WIRELESS_EXT >= 15
+static void ieee80211_michael_mic_failure(struct net_device *dev,
+                                       struct ieee80211_hdr *hdr,
+                                       int keyidx)
+{
+        union iwreq_data wrqu;
+        char buf[128];
+
+        /* TODO: needed parameters: count, keyid, key type, TSC */
+        sprintf(buf, "MLME-MICHAELMICFAILURE.indication(keyid=%d %scast addr="
+                MAC_FMT ")", keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni",
+                MAC_ARG(hdr->addr2));
+        memset(&wrqu, 0, sizeof(wrqu));
+        wrqu.data.length = strlen(buf);
+        wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);
+}
+#else /* WIRELESS_EXT >= 15 */
+static inline void ieee80211_michael_mic_failure(struct net_device *dev,
+                                              struct ieee80211_hdr *hdr,
+                                              int keyidx)
+{
+}
+#endif /* WIRELESS_EXT >= 15 */
+
+
+static int ieee80211_michael_mic_verify(struct sk_buff *skb, int keyidx,
+                                     int hdr_len, void *priv)
+{
+        struct ieee80211_tkip_data *tkey = priv;
+        u8 mic[8];
+
+        if (!tkey->key_set)
+                return -1;
+
+        michael_mic_hdr(skb, tkey->rx_hdr);
+        if (michael_mic(tkey, &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 ieee80211_hdr *hdr;
+                hdr = (struct ieee80211_hdr *) skb->data;
+                printk(KERN_DEBUG "%s: Michael MIC verification failed for "
+                       "MSDU from " MAC_FMT " keyidx=%d\n",
+                       skb->dev ? skb->dev->name : "N/A", MAC_ARG(hdr->addr2),
+                       keyidx);
+                if (skb->dev)
+                        ieee80211_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 ieee80211_tkip_set_key(void *key, int len, u8 *seq, void *priv)
+{
+        struct ieee80211_tkip_data *tkey = priv;
+        int keyidx;
+        struct crypto_tfm *tfm = tkey->tfm_michael;
+        struct crypto_tfm *tfm2 = tkey->tfm_arc4;
+
+        keyidx = tkey->key_idx;
+        memset(tkey, 0, sizeof(*tkey));
+        tkey->key_idx = keyidx;
+        tkey->tfm_michael = tfm;
+        tkey->tfm_arc4 = tfm2;
+        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 ieee80211_tkip_get_key(void *key, int len, u8 *seq, void *priv)
+{
+        struct ieee80211_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 char * ieee80211_tkip_print_stats(char *p, void *priv)
+{
+        struct ieee80211_tkip_data *tkip = priv;
+        p += sprintf(p, "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);
+        return p;
+}
+
+
+static struct ieee80211_crypto_ops ieee80211_crypt_tkip = {
+        .name                   = "TKIP",
+        .init                   = ieee80211_tkip_init,
+        .deinit                 = ieee80211_tkip_deinit,
+        .encrypt_mpdu           = ieee80211_tkip_encrypt,
+        .decrypt_mpdu           = ieee80211_tkip_decrypt,
+        .encrypt_msdu           = ieee80211_michael_mic_add,
+        .decrypt_msdu           = ieee80211_michael_mic_verify,
+        .set_key                = ieee80211_tkip_set_key,
+        .get_key                = ieee80211_tkip_get_key,
+        .print_stats            = ieee80211_tkip_print_stats,
+        .extra_prefix_len       = 4 + 4, /* IV + ExtIV */
+        .extra_postfix_len      = 8 + 4, /* MIC + ICV */
+        .owner                  = THIS_MODULE,
+};
+
+
+static int __init ieee80211_crypto_tkip_init(void)
+{
+        return ieee80211_register_crypto_ops(&ieee80211_crypt_tkip);
+}
+
+
+static void __exit ieee80211_crypto_tkip_exit(void)
+{
+        ieee80211_unregister_crypto_ops(&ieee80211_crypt_tkip);
+}
+
+
+module_init(ieee80211_crypto_tkip_init);
+module_exit(ieee80211_crypto_tkip_exit);