Staging: add Realtek 8192 PCI wireless driver

This wireless driver should work for the Realtek 8192 PCI devices.

It comes directly from Realtek and has been tested to work on at least
one laptop in the wild.

Cc: Anthony Wong <awong1@novell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 397 insertions, 0 deletions

diff --git a/drivers/staging/rtl8192e/ieee80211/ieee80211_crypt_wep.c b/drivers/staging/rtl8192e/ieee80211/ieee80211_crypt_wep.c
new file mode 100644
index 000000000000..634143551357
--- /dev/null
+++ b/drivers/staging/rtl8192e/ieee80211/ieee80211_crypt_wep.c
@@ -0,0 +1,397 @@
+/*
+ * Host AP crypt: host-based WEP encryption implementation for Host AP driver
+ *
+ * Copyright (c) 2002-2004, 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 <asm/string.h>
+
+#include "ieee80211.h"
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,20))
+//#include "crypto_compat.h"
+#endif
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+#include "rtl_crypto.h"
+#else
+#include <linux/crypto.h>
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20)
+    #include <asm/scatterlist.h>
+#else
+    #include <linux/scatterlist.h>
+#endif
+//#include <asm/scatterlist.h>
+#include <linux/crc32.h>
+//
+/*
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
+#include "rtl_crypto.h"
+#else
+#include <linux/crypto.h>
+#endif
+
+#include <asm/scatterlist.h>
+#include <linux/crc32.h>
+*/
+MODULE_AUTHOR("Jouni Malinen");
+MODULE_DESCRIPTION("Host AP crypt: WEP");
+MODULE_LICENSE("GPL");
+#ifndef OPENSUSE_SLED
+#define OPENSUSE_SLED 0
+#endif
+
+struct prism2_wep_data {
+	u32 iv;
+#define WEP_KEY_LEN 13
+	u8 key[WEP_KEY_LEN + 1];
+	u8 key_len;
+	u8 key_idx;
+#if((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)) && (!OPENSUSE_SLED))
+	struct crypto_tfm *tfm;
+	#else
+        struct crypto_blkcipher *tx_tfm;
+        struct crypto_blkcipher *rx_tfm;
+        #endif
+};
+
+
+static void * prism2_wep_init(int keyidx)
+{
+	struct prism2_wep_data *priv;
+
+	priv = kmalloc(sizeof(*priv), GFP_ATOMIC);
+	if (priv == NULL)
+		goto fail;
+	memset(priv, 0, sizeof(*priv));
+	priv->key_idx = keyidx;
+
+#if((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)) && (!OPENSUSE_SLED))
+	priv->tfm = crypto_alloc_tfm("arc4", 0);
+	if (priv->tfm == NULL) {
+		printk(KERN_DEBUG "ieee80211_crypt_wep: could not allocate "
+		       "crypto API arc4\n");
+		goto fail;
+	}
+	#else
+	priv->tx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
+        if (IS_ERR(priv->tx_tfm)) {
+                printk(KERN_DEBUG "ieee80211_crypt_wep: could not allocate "
+                       "crypto API arc4\n");
+                priv->tx_tfm = NULL;
+                goto fail;
+        }
+        priv->rx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0, CRYPTO_ALG_ASYNC);
+        if (IS_ERR(priv->rx_tfm)) {
+                printk(KERN_DEBUG "ieee80211_crypt_wep: could not allocate "
+                       "crypto API arc4\n");
+                priv->rx_tfm = NULL;
+                goto fail;
+        }
+        #endif
+
+	/* start WEP IV from a random value */
+	get_random_bytes(&priv->iv, 4);
+
+	return priv;
+
+fail:
+#if((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)) && (!OPENSUSE_SLED))
+	if (priv) {
+		if (priv->tfm)
+			crypto_free_tfm(priv->tfm);
+		kfree(priv);
+	}
+	#else
+	if (priv) {
+                if (priv->tx_tfm)
+                        crypto_free_blkcipher(priv->tx_tfm);
+                if (priv->rx_tfm)
+                        crypto_free_blkcipher(priv->rx_tfm);
+                kfree(priv);
+        }
+        #endif
+	return NULL;
+}
+
+
+static void prism2_wep_deinit(void *priv)
+{
+	struct prism2_wep_data *_priv = priv;
+#if((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)) && (!OPENSUSE_SLED))
+	if (_priv && _priv->tfm)
+		crypto_free_tfm(_priv->tfm);
+	#else
+	if (_priv) {
+                if (_priv->tx_tfm)
+                        crypto_free_blkcipher(_priv->tx_tfm);
+                if (_priv->rx_tfm)
+                        crypto_free_blkcipher(_priv->rx_tfm);
+        }
+        #endif
+	kfree(priv);
+}
+
+/* Perform WEP encryption on given skb that has at least 4 bytes of headroom
+ * for IV and 4 bytes of tailroom for ICV. Both IV and ICV will be transmitted,
+ * so the payload length increases with 8 bytes.
+ *
+ * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
+ */
+static int prism2_wep_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+	struct prism2_wep_data *wep = priv;
+	u32 klen, len;
+	u8 key[WEP_KEY_LEN + 3];
+	u8 *pos;
+	cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
+	#if((LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)) || (OPENSUSE_SLED))
+	struct blkcipher_desc desc = {.tfm = wep->tx_tfm};
+	#endif
+	u32 crc;
+	u8 *icv;
+	struct scatterlist sg;
+	if (skb_headroom(skb) < 4 || skb_tailroom(skb) < 4 ||
+	    skb->len < hdr_len)
+		return -1;
+
+	len = skb->len - hdr_len;
+	pos = skb_push(skb, 4);
+	memmove(pos, pos + 4, hdr_len);
+	pos += hdr_len;
+
+	klen = 3 + wep->key_len;
+
+	wep->iv++;
+
+	/* Fluhrer, Mantin, and Shamir have reported weaknesses in the key
+	 * scheduling algorithm of RC4. At least IVs (KeyByte + 3, 0xff, N)
+	 * can be used to speedup attacks, so avoid using them. */
+	if ((wep->iv & 0xff00) == 0xff00) {
+		u8 B = (wep->iv >> 16) & 0xff;
+		if (B >= 3 && B < klen)
+			wep->iv += 0x0100;
+	}
+
+	/* Prepend 24-bit IV to RC4 key and TX frame */
+	*pos++ = key[0] = (wep->iv >> 16) & 0xff;
+	*pos++ = key[1] = (wep->iv >> 8) & 0xff;
+	*pos++ = key[2] = wep->iv & 0xff;
+	*pos++ = wep->key_idx << 6;
+
+	/* Copy rest of the WEP key (the secret part) */
+	memcpy(key + 3, wep->key, wep->key_len);
+
+	if (!tcb_desc->bHwSec)
+	{
+
+		/* Append little-endian CRC32 and encrypt it to produce ICV */
+	#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+		crc = ~crc32_le(~0, pos, len);
+	#else
+		crc = ~ether_crc_le(len, pos);
+	#endif
+		icv = skb_put(skb, 4);
+		icv[0] = crc;
+		icv[1] = crc >> 8;
+		icv[2] = crc >> 16;
+		icv[3] = crc >> 24;
+
+#if((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)) && (!OPENSUSE_SLED))
+		crypto_cipher_setkey(wep->tfm, key, klen);
+		sg.page = virt_to_page(pos);
+		sg.offset = offset_in_page(pos);
+		sg.length = len + 4;
+		crypto_cipher_encrypt(wep->tfm, &sg, &sg, len + 4);
+		return 0;
+	#else
+		crypto_blkcipher_setkey(wep->tx_tfm, key, klen);
+	#if(LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24))
+		sg.page = virt_to_page(pos);
+		sg.offset = offset_in_page(pos);
+		sg.length = len + 4;
+	#else
+		sg_init_one(&sg, pos, len+4);
+	#endif
+		return crypto_blkcipher_encrypt(&desc, &sg, &sg, len + 4);
+	#endif
+	}
+
+	return 0;
+}
+
+
+/* Perform WEP decryption on given buffer. Buffer includes whole WEP part of
+ * the frame: IV (4 bytes), encrypted payload (including SNAP header),
+ * ICV (4 bytes). len includes both IV and ICV.
+ *
+ * Returns 0 if frame was decrypted successfully and ICV was correct and -1 on
+ * failure. If frame is OK, IV and ICV will be removed.
+ */
+static int prism2_wep_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+	struct prism2_wep_data *wep = priv;
+	u32  klen, plen;
+	u8 key[WEP_KEY_LEN + 3];
+	u8 keyidx, *pos;
+	cb_desc *tcb_desc = (cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
+	#if((LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,21)) || (OPENSUSE_SLED))
+	struct blkcipher_desc desc = {.tfm = wep->rx_tfm};
+	#endif
+	u32 crc;
+	u8 icv[4];
+	struct scatterlist sg;
+	if (skb->len < hdr_len + 8)
+		return -1;
+
+	pos = skb->data + hdr_len;
+	key[0] = *pos++;
+	key[1] = *pos++;
+	key[2] = *pos++;
+	keyidx = *pos++ >> 6;
+	if (keyidx != wep->key_idx)
+		return -1;
+
+	klen = 3 + wep->key_len;
+
+	/* Copy rest of the WEP key (the secret part) */
+	memcpy(key + 3, wep->key, wep->key_len);
+
+	/* Apply RC4 to data and compute CRC32 over decrypted data */
+	plen = skb->len - hdr_len - 8;
+
+	if (!tcb_desc->bHwSec)
+	{
+#if((LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)) && (!OPENSUSE_SLED))
+		crypto_cipher_setkey(wep->tfm, key, klen);
+		sg.page = virt_to_page(pos);
+		sg.offset = offset_in_page(pos);
+		sg.length = plen + 4;
+		crypto_cipher_decrypt(wep->tfm, &sg, &sg, plen + 4);
+	#else
+		crypto_blkcipher_setkey(wep->rx_tfm, key, klen);
+	#if(LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24))
+		sg.page = virt_to_page(pos);
+		sg.offset = offset_in_page(pos);
+		sg.length = plen + 4;
+	#else
+		sg_init_one(&sg, pos, plen+4);
+	#endif
+		if (crypto_blkcipher_decrypt(&desc, &sg, &sg, plen + 4))
+			return -7;
+	#endif
+	#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+		crc = ~crc32_le(~0, pos, plen);
+	#else
+		crc = ~ether_crc_le(plen, pos);
+	#endif
+		icv[0] = crc;
+		icv[1] = crc >> 8;
+		icv[2] = crc >> 16;
+		icv[3] = crc >> 24;
+		if (memcmp(icv, pos + plen, 4) != 0) {
+			/* ICV mismatch - drop frame */
+			return -2;
+		}
+	}
+	/* Remove IV and ICV */
+	memmove(skb->data + 4, skb->data, hdr_len);
+	skb_pull(skb, 4);
+	skb_trim(skb, skb->len - 4);
+
+	return 0;
+}
+
+
+static int prism2_wep_set_key(void *key, int len, u8 *seq, void *priv)
+{
+	struct prism2_wep_data *wep = priv;
+
+	if (len < 0 || len > WEP_KEY_LEN)
+		return -1;
+
+	memcpy(wep->key, key, len);
+	wep->key_len = len;
+
+	return 0;
+}
+
+
+static int prism2_wep_get_key(void *key, int len, u8 *seq, void *priv)
+{
+	struct prism2_wep_data *wep = priv;
+
+	if (len < wep->key_len)
+		return -1;
+
+	memcpy(key, wep->key, wep->key_len);
+
+	return wep->key_len;
+}
+
+
+static char * prism2_wep_print_stats(char *p, void *priv)
+{
+	struct prism2_wep_data *wep = priv;
+	p += sprintf(p, "key[%d] alg=WEP len=%d\n",
+		     wep->key_idx, wep->key_len);
+	return p;
+}
+
+
+static struct ieee80211_crypto_ops ieee80211_crypt_wep = {
+	.name			= "WEP",
+	.init			= prism2_wep_init,
+	.deinit			= prism2_wep_deinit,
+	.encrypt_mpdu		= prism2_wep_encrypt,
+	.decrypt_mpdu		= prism2_wep_decrypt,
+	.encrypt_msdu		= NULL,
+	.decrypt_msdu		= NULL,
+	.set_key		= prism2_wep_set_key,
+	.get_key		= prism2_wep_get_key,
+	.print_stats		= prism2_wep_print_stats,
+	.extra_prefix_len	= 4, /* IV */
+	.extra_postfix_len	= 4, /* ICV */
+	.owner			= THIS_MODULE,
+};
+
+
+int __init ieee80211_crypto_wep_init(void)
+{
+	return ieee80211_register_crypto_ops(&ieee80211_crypt_wep);
+}
+
+
+void __exit ieee80211_crypto_wep_exit(void)
+{
+	ieee80211_unregister_crypto_ops(&ieee80211_crypt_wep);
+}
+
+void ieee80211_wep_null(void)
+{
+//	printk("============>%s()\n", __FUNCTION__);
+        return;
+}
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+//EXPORT_SYMBOL(ieee80211_wep_null);
+#else
+EXPORT_SYMBOL_NOVERS(ieee80211_wep_null);
+#endif
+
+//module_init(ieee80211_crypto_wep_init);
+//module_exit(ieee80211_crypto_wep_exit);