diff options
Diffstat (limited to 'drivers/net/wireless/hostap/hostap_crypt_ccmp.c')
-rw-r--r-- | drivers/net/wireless/hostap/hostap_crypt_ccmp.c | 487 |
1 files changed, 0 insertions, 487 deletions
diff --git a/drivers/net/wireless/hostap/hostap_crypt_ccmp.c b/drivers/net/wireless/hostap/hostap_crypt_ccmp.c deleted file mode 100644 index 9e18340f7a38..000000000000 --- a/drivers/net/wireless/hostap/hostap_crypt_ccmp.c +++ /dev/null @@ -1,487 +0,0 @@ -/* - * Host AP crypt: host-based CCMP 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" - -#ifndef CONFIG_CRYPTO -#error CONFIG_CRYPTO is required to build this module. -#endif -#include <linux/crypto.h> -#include <asm/scatterlist.h> - -MODULE_AUTHOR("Jouni Malinen"); -MODULE_DESCRIPTION("Host AP crypt: CCMP"); -MODULE_LICENSE("GPL"); -MODULE_VERSION(PRISM2_VERSION); - - -#define AES_BLOCK_LEN 16 -#define CCMP_HDR_LEN 8 -#define CCMP_MIC_LEN 8 -#define CCMP_TK_LEN 16 -#define CCMP_PN_LEN 6 - - -struct hostap_ccmp_data { - u8 key[CCMP_TK_LEN]; - int key_set; - - u8 tx_pn[CCMP_PN_LEN]; - u8 rx_pn[CCMP_PN_LEN]; - - u32 dot11RSNAStatsCCMPFormatErrors; - u32 dot11RSNAStatsCCMPReplays; - u32 dot11RSNAStatsCCMPDecryptErrors; - - int key_idx; - - struct crypto_tfm *tfm; - - /* scratch buffers for virt_to_page() (crypto API) */ - u8 tx_b0[AES_BLOCK_LEN], tx_b[AES_BLOCK_LEN], - tx_e[AES_BLOCK_LEN], tx_s0[AES_BLOCK_LEN]; - u8 rx_b0[AES_BLOCK_LEN], rx_b[AES_BLOCK_LEN], rx_a[AES_BLOCK_LEN]; -}; - - -void hostap_ccmp_aes_encrypt(struct crypto_tfm *tfm, - const u8 pt[16], u8 ct[16]) -{ - struct scatterlist src, dst; - - src.page = virt_to_page(pt); - src.offset = offset_in_page(pt); - src.length = AES_BLOCK_LEN; - - dst.page = virt_to_page(ct); - dst.offset = offset_in_page(ct); - dst.length = AES_BLOCK_LEN; - - crypto_cipher_encrypt(tfm, &dst, &src, AES_BLOCK_LEN); -} - - -static void * hostap_ccmp_init(int key_idx) -{ - struct hostap_ccmp_data *priv; - - if (!try_module_get(THIS_MODULE)) - return NULL; - - priv = (struct hostap_ccmp_data *) kmalloc(sizeof(*priv), GFP_ATOMIC); - if (priv == NULL) { - goto fail; - } - memset(priv, 0, sizeof(*priv)); - priv->key_idx = key_idx; - - priv->tfm = crypto_alloc_tfm("aes", 0); - if (priv->tfm == NULL) { - printk(KERN_DEBUG "hostap_crypt_ccmp: could not allocate " - "crypto API aes\n"); - goto fail; - } - - return priv; - -fail: - if (priv) { - if (priv->tfm) - crypto_free_tfm(priv->tfm); - kfree(priv); - } - module_put(THIS_MODULE); - return NULL; -} - - -static void hostap_ccmp_deinit(void *priv) -{ - struct hostap_ccmp_data *_priv = priv; - if (_priv && _priv->tfm) - crypto_free_tfm(_priv->tfm); - kfree(priv); - module_put(THIS_MODULE); -} - - -static inline void xor_block(u8 *b, u8 *a, size_t len) -{ - int i; - for (i = 0; i < len; i++) - b[i] ^= a[i]; -} - - -static void ccmp_init_blocks(struct crypto_tfm *tfm, - struct hostap_ieee80211_hdr *hdr, - u8 *pn, size_t dlen, u8 *b0, u8 *auth, - u8 *s0) -{ - u8 *pos, qc = 0; - size_t aad_len; - u16 fc; - int a4_included, qc_included; - u8 aad[2 * AES_BLOCK_LEN]; - - fc = le16_to_cpu(hdr->frame_control); - a4_included = ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) == - (WLAN_FC_TODS | WLAN_FC_FROMDS)); - qc_included = ((HOSTAP_FC_GET_TYPE(fc) == WLAN_FC_TYPE_DATA) && - (HOSTAP_FC_GET_STYPE(fc) & 0x08)); - aad_len = 22; - if (a4_included) - aad_len += 6; - if (qc_included) { - pos = (u8 *) &hdr->addr4; - if (a4_included) - pos += 6; - qc = *pos & 0x0f; - aad_len += 2; - } - - /* CCM Initial Block: - * Flag (Include authentication header, M=3 (8-octet MIC), - * L=1 (2-octet Dlen)) - * Nonce: 0x00 | A2 | PN - * Dlen */ - b0[0] = 0x59; - b0[1] = qc; - memcpy(b0 + 2, hdr->addr2, ETH_ALEN); - memcpy(b0 + 8, pn, CCMP_PN_LEN); - b0[14] = (dlen >> 8) & 0xff; - b0[15] = dlen & 0xff; - - /* AAD: - * FC with bits 4..6 and 11..13 masked to zero; 14 is always one - * A1 | A2 | A3 - * SC with bits 4..15 (seq#) masked to zero - * A4 (if present) - * QC (if present) - */ - pos = (u8 *) hdr; - aad[0] = 0; /* aad_len >> 8 */ - aad[1] = aad_len & 0xff; - aad[2] = pos[0] & 0x8f; - aad[3] = pos[1] & 0xc7; - memcpy(aad + 4, hdr->addr1, 3 * ETH_ALEN); - pos = (u8 *) &hdr->seq_ctrl; - aad[22] = pos[0] & 0x0f; - aad[23] = 0; /* all bits masked */ - memset(aad + 24, 0, 8); - if (a4_included) - memcpy(aad + 24, hdr->addr4, ETH_ALEN); - if (qc_included) { - aad[a4_included ? 30 : 24] = qc; - /* rest of QC masked */ - } - - /* Start with the first block and AAD */ - hostap_ccmp_aes_encrypt(tfm, b0, auth); - xor_block(auth, aad, AES_BLOCK_LEN); - hostap_ccmp_aes_encrypt(tfm, auth, auth); - xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN); - hostap_ccmp_aes_encrypt(tfm, auth, auth); - b0[0] &= 0x07; - b0[14] = b0[15] = 0; - hostap_ccmp_aes_encrypt(tfm, b0, s0); -} - - -static int hostap_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv) -{ - struct hostap_ccmp_data *key = priv; - int data_len, i, blocks, last, len; - u8 *pos, *mic; - struct hostap_ieee80211_hdr *hdr; - u8 *b0 = key->tx_b0; - u8 *b = key->tx_b; - u8 *e = key->tx_e; - u8 *s0 = key->tx_s0; - - if (skb_headroom(skb) < CCMP_HDR_LEN || - skb_tailroom(skb) < CCMP_MIC_LEN || - skb->len < hdr_len) - return -1; - - data_len = skb->len - hdr_len; - pos = skb_push(skb, CCMP_HDR_LEN); - memmove(pos, pos + CCMP_HDR_LEN, hdr_len); - pos += hdr_len; - mic = skb_put(skb, CCMP_MIC_LEN); - - i = CCMP_PN_LEN - 1; - while (i >= 0) { - key->tx_pn[i]++; - if (key->tx_pn[i] != 0) - break; - i--; - } - - *pos++ = key->tx_pn[5]; - *pos++ = key->tx_pn[4]; - *pos++ = 0; - *pos++ = (key->key_idx << 6) | (1 << 5) /* Ext IV included */; - *pos++ = key->tx_pn[3]; - *pos++ = key->tx_pn[2]; - *pos++ = key->tx_pn[1]; - *pos++ = key->tx_pn[0]; - - hdr = (struct hostap_ieee80211_hdr *) skb->data; - ccmp_init_blocks(key->tfm, hdr, key->tx_pn, data_len, b0, b, s0); - - blocks = (data_len + AES_BLOCK_LEN - 1) / AES_BLOCK_LEN; - last = data_len % AES_BLOCK_LEN; - - for (i = 1; i <= blocks; i++) { - len = (i == blocks && last) ? last : AES_BLOCK_LEN; - /* Authentication */ - xor_block(b, pos, len); - hostap_ccmp_aes_encrypt(key->tfm, b, b); - /* Encryption, with counter */ - b0[14] = (i >> 8) & 0xff; - b0[15] = i & 0xff; - hostap_ccmp_aes_encrypt(key->tfm, b0, e); - xor_block(pos, e, len); - pos += len; - } - - for (i = 0; i < CCMP_MIC_LEN; i++) - mic[i] = b[i] ^ s0[i]; - - return 0; -} - - -static int hostap_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv) -{ - struct hostap_ccmp_data *key = priv; - u8 keyidx, *pos; - struct hostap_ieee80211_hdr *hdr; - u8 *b0 = key->rx_b0; - u8 *b = key->rx_b; - u8 *a = key->rx_a; - u8 pn[6]; - int i, blocks, last, len; - size_t data_len = skb->len - hdr_len - CCMP_HDR_LEN - CCMP_MIC_LEN; - u8 *mic = skb->data + skb->len - CCMP_MIC_LEN; - - if (skb->len < hdr_len + CCMP_HDR_LEN + CCMP_MIC_LEN) { - key->dot11RSNAStatsCCMPFormatErrors++; - 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 "CCMP: received packet without ExtIV" - " flag from " MACSTR "\n", MAC2STR(hdr->addr2)); - } - key->dot11RSNAStatsCCMPFormatErrors++; - return -2; - } - keyidx >>= 6; - if (key->key_idx != keyidx) { - printk(KERN_DEBUG "CCMP: RX tkey->key_idx=%d frame " - "keyidx=%d priv=%p\n", key->key_idx, keyidx, priv); - return -6; - } - if (!key->key_set) { - if (net_ratelimit()) { - printk(KERN_DEBUG "CCMP: received packet from " MACSTR - " with keyid=%d that does not have a configured" - " key\n", MAC2STR(hdr->addr2), keyidx); - } - return -3; - } - - pn[0] = pos[7]; - pn[1] = pos[6]; - pn[2] = pos[5]; - pn[3] = pos[4]; - pn[4] = pos[1]; - pn[5] = pos[0]; - pos += 8; - - if (memcmp(pn, key->rx_pn, CCMP_PN_LEN) <= 0) { - if (net_ratelimit()) { - printk(KERN_DEBUG "CCMP: replay detected: STA=" MACSTR - " previous PN %02x%02x%02x%02x%02x%02x " - "received PN %02x%02x%02x%02x%02x%02x\n", - MAC2STR(hdr->addr2), MAC2STR(key->rx_pn), - MAC2STR(pn)); - } - key->dot11RSNAStatsCCMPReplays++; - return -4; - } - - ccmp_init_blocks(key->tfm, hdr, pn, data_len, b0, a, b); - xor_block(mic, b, CCMP_MIC_LEN); - - blocks = (data_len + AES_BLOCK_LEN - 1) / AES_BLOCK_LEN; - last = data_len % AES_BLOCK_LEN; - - for (i = 1; i <= blocks; i++) { - len = (i == blocks && last) ? last : AES_BLOCK_LEN; - /* Decrypt, with counter */ - b0[14] = (i >> 8) & 0xff; - b0[15] = i & 0xff; - hostap_ccmp_aes_encrypt(key->tfm, b0, b); - xor_block(pos, b, len); - /* Authentication */ - xor_block(a, pos, len); - hostap_ccmp_aes_encrypt(key->tfm, a, a); - pos += len; - } - - if (memcmp(mic, a, CCMP_MIC_LEN) != 0) { - if (net_ratelimit()) { - printk(KERN_DEBUG "CCMP: decrypt failed: STA=" - MACSTR "\n", MAC2STR(hdr->addr2)); - } - key->dot11RSNAStatsCCMPDecryptErrors++; - return -5; - } - - memcpy(key->rx_pn, pn, CCMP_PN_LEN); - - /* Remove hdr and MIC */ - memmove(skb->data + CCMP_HDR_LEN, skb->data, hdr_len); - skb_pull(skb, CCMP_HDR_LEN); - skb_trim(skb, skb->len - CCMP_MIC_LEN); - - return keyidx; -} - - -static int hostap_ccmp_set_key(void *key, int len, u8 *seq, void *priv) -{ - struct hostap_ccmp_data *data = priv; - int keyidx; - struct crypto_tfm *tfm = data->tfm; - - keyidx = data->key_idx; - memset(data, 0, sizeof(*data)); - data->key_idx = keyidx; - data->tfm = tfm; - if (len == CCMP_TK_LEN) { - memcpy(data->key, key, CCMP_TK_LEN); - data->key_set = 1; - if (seq) { - data->rx_pn[0] = seq[5]; - data->rx_pn[1] = seq[4]; - data->rx_pn[2] = seq[3]; - data->rx_pn[3] = seq[2]; - data->rx_pn[4] = seq[1]; - data->rx_pn[5] = seq[0]; - } - crypto_cipher_setkey(data->tfm, data->key, CCMP_TK_LEN); - } else if (len == 0) { - data->key_set = 0; - } else - return -1; - - return 0; -} - - -static int hostap_ccmp_get_key(void *key, int len, u8 *seq, void *priv) -{ - struct hostap_ccmp_data *data = priv; - - if (len < CCMP_TK_LEN) - return -1; - - if (!data->key_set) - return 0; - memcpy(key, data->key, CCMP_TK_LEN); - - if (seq) { - seq[0] = data->tx_pn[5]; - seq[1] = data->tx_pn[4]; - seq[2] = data->tx_pn[3]; - seq[3] = data->tx_pn[2]; - seq[4] = data->tx_pn[1]; - seq[5] = data->tx_pn[0]; - } - - return CCMP_TK_LEN; -} - - -static char * hostap_ccmp_print_stats(char *p, void *priv) -{ - struct hostap_ccmp_data *ccmp = priv; - p += sprintf(p, "key[%d] alg=CCMP key_set=%d " - "tx_pn=%02x%02x%02x%02x%02x%02x " - "rx_pn=%02x%02x%02x%02x%02x%02x " - "format_errors=%d replays=%d decrypt_errors=%d\n", - ccmp->key_idx, ccmp->key_set, - MAC2STR(ccmp->tx_pn), MAC2STR(ccmp->rx_pn), - ccmp->dot11RSNAStatsCCMPFormatErrors, - ccmp->dot11RSNAStatsCCMPReplays, - ccmp->dot11RSNAStatsCCMPDecryptErrors); - - return p; -} - - -static struct hostap_crypto_ops hostap_crypt_ccmp = { - .name = "CCMP", - .init = hostap_ccmp_init, - .deinit = hostap_ccmp_deinit, - .encrypt_mpdu = hostap_ccmp_encrypt, - .decrypt_mpdu = hostap_ccmp_decrypt, - .encrypt_msdu = NULL, - .decrypt_msdu = NULL, - .set_key = hostap_ccmp_set_key, - .get_key = hostap_ccmp_get_key, - .print_stats = hostap_ccmp_print_stats, - .extra_prefix_len = CCMP_HDR_LEN, - .extra_postfix_len = CCMP_MIC_LEN -}; - - -static int __init hostap_crypto_ccmp_init(void) -{ - if (hostap_register_crypto_ops(&hostap_crypt_ccmp) < 0) - return -1; - - return 0; -} - - -static void __exit hostap_crypto_ccmp_exit(void) -{ - hostap_unregister_crypto_ops(&hostap_crypt_ccmp); -} - - -module_init(hostap_crypto_ccmp_init); -module_exit(hostap_crypto_ccmp_exit); |