diff options
Diffstat (limited to 'drivers/net/wireless/hostap/hostap_crypt_tkip.c')
-rw-r--r-- | drivers/net/wireless/hostap/hostap_crypt_tkip.c | 697 |
1 files changed, 0 insertions, 697 deletions
diff --git a/drivers/net/wireless/hostap/hostap_crypt_tkip.c b/drivers/net/wireless/hostap/hostap_crypt_tkip.c deleted file mode 100644 index fcf1a014f4a..00000000000 --- a/drivers/net/wireless/hostap/hostap_crypt_tkip.c +++ /dev/null @@ -1,697 +0,0 @@ -/* - * 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 <linux/wireless.h> -#include <net/iw_handler.h> -#include <asm/string.h> - -#include "hostap_crypt.h" -#include "hostap_wlan.h" -#include "hostap_80211.h" -#include "hostap_config.h" - -#ifndef CONFIG_CRYPTO -#error CONFIG_CRYPTO is required to build this module. -#endif -#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"); -MODULE_VERSION(PRISM2_VERSION); - - -struct hostap_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 * hostap_tkip_init(int key_idx) -{ - struct hostap_tkip_data *priv; - - if (!try_module_get(THIS_MODULE)) - return NULL; - - priv = (struct hostap_tkip_data *) 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 "hostap_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 "hostap_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); - } - module_put(THIS_MODULE); - return NULL; -} - - -static void hostap_tkip_deinit(void *priv) -{ - struct hostap_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); - module_put(THIS_MODULE); -} - - -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 hostap_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv) -{ - struct hostap_tkip_data *tkey = priv; - int len; - u8 rc4key[16], *pos, *icv; - struct hostap_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 hostap_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 hostap_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv) -{ - struct hostap_tkip_data *tkey = priv; - u8 rc4key[16]; - u8 keyidx, *pos, icv[4]; - u32 iv32; - u16 iv16; - struct hostap_ieee80211_hdr *hdr; - u32 crc; - struct scatterlist sg; - int plen; - - if (skb->len < hdr_len + 8 + 4) - return -1; - - hdr = (struct hostap_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 " MACSTR "\n", MAC2STR(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 " MACSTR - " with keyid=%d that does not have a configured" - " key\n", MAC2STR(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=" MACSTR - " previous TSC %08x%04x received TSC " - "%08x%04x\n", MAC2STR(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=" - MACSTR "\n", MAC2STR(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 hostap_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 hostap_ieee80211_hdr *hdr11; - - hdr11 = (struct hostap_ieee80211_hdr *) skb->data; - switch (le16_to_cpu(hdr11->frame_control) & - (WLAN_FC_FROMDS | WLAN_FC_TODS)) { - case WLAN_FC_TODS: - memcpy(hdr, hdr11->addr3, ETH_ALEN); /* DA */ - memcpy(hdr + ETH_ALEN, hdr11->addr2, ETH_ALEN); /* SA */ - break; - case WLAN_FC_FROMDS: - memcpy(hdr, hdr11->addr1, ETH_ALEN); /* DA */ - memcpy(hdr + ETH_ALEN, hdr11->addr3, ETH_ALEN); /* SA */ - break; - case WLAN_FC_FROMDS | WLAN_FC_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 hostap_michael_mic_add(struct sk_buff *skb, int hdr_len, void *priv) -{ - struct hostap_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; -} - - -static void hostap_michael_mic_failure(struct net_device *dev, - struct hostap_ieee80211_hdr *hdr, - int keyidx) -{ - union iwreq_data wrqu; - char buf[128]; - - /* TODO: needed parameters: count, keyid, key type, src address, TSC */ - sprintf(buf, "MLME-MICHAELMICFAILURE.indication(keyid=%d %scast addr=" - MACSTR ")", keyidx, hdr->addr1[0] & 0x01 ? "broad" : "uni", - MAC2STR(hdr->addr2)); - memset(&wrqu, 0, sizeof(wrqu)); - wrqu.data.length = strlen(buf); - wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf); -} - - -static int hostap_michael_mic_verify(struct sk_buff *skb, int keyidx, - int hdr_len, void *priv) -{ - struct hostap_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 hostap_ieee80211_hdr *hdr; - hdr = (struct hostap_ieee80211_hdr *) skb->data; - printk(KERN_DEBUG "%s: Michael MIC verification failed for " - "MSDU from " MACSTR " keyidx=%d\n", - skb->dev ? skb->dev->name : "N/A", MAC2STR(hdr->addr2), - keyidx); - if (skb->dev) - hostap_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 hostap_tkip_set_key(void *key, int len, u8 *seq, void *priv) -{ - struct hostap_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 hostap_tkip_get_key(void *key, int len, u8 *seq, void *priv) -{ - struct hostap_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 * hostap_tkip_print_stats(char *p, void *priv) -{ - struct hostap_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 hostap_crypto_ops hostap_crypt_tkip = { - .name = "TKIP", - .init = hostap_tkip_init, - .deinit = hostap_tkip_deinit, - .encrypt_mpdu = hostap_tkip_encrypt, - .decrypt_mpdu = hostap_tkip_decrypt, - .encrypt_msdu = hostap_michael_mic_add, - .decrypt_msdu = hostap_michael_mic_verify, - .set_key = hostap_tkip_set_key, - .get_key = hostap_tkip_get_key, - .print_stats = hostap_tkip_print_stats, - .extra_prefix_len = 4 + 4 /* IV + ExtIV */, - .extra_postfix_len = 8 + 4 /* MIC + ICV */ -}; - - -static int __init hostap_crypto_tkip_init(void) -{ - if (hostap_register_crypto_ops(&hostap_crypt_tkip) < 0) - return -1; - - return 0; -} - - -static void __exit hostap_crypto_tkip_exit(void) -{ - hostap_unregister_crypto_ops(&hostap_crypt_tkip); -} - - -module_init(hostap_crypto_tkip_init); -module_exit(hostap_crypto_tkip_exit); |