Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 241 insertions, 0 deletions

diff --git a/drivers/staging/rtl8192e/rtllib_crypt_wep.c b/drivers/staging/rtl8192e/rtllib_crypt_wep.c
new file mode 100644
index 000000000..062285e4d
--- /dev/null
+++ b/drivers/staging/rtl8192e/rtllib_crypt_wep.c
@@ -0,0 +1,241 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Host AP crypt: host-based WEP encryption implementation for Host AP driver
+ *
+ * Copyright (c) 2002-2004, Jouni Malinen <jkmaline@cc.hut.fi>
+ */
+
+#include <crypto/arc4.h>
+#include <linux/fips.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/random.h>
+#include <linux/skbuff.h>
+#include <linux/string.h>
+#include "rtllib.h"
+
+#include <linux/crc32.h>
+
+struct prism2_wep_data {
+	u32 iv;
+#define WEP_KEY_LEN 13
+	u8 key[WEP_KEY_LEN + 1];
+	u8 key_len;
+	u8 key_idx;
+	struct arc4_ctx rx_ctx_arc4;
+	struct arc4_ctx tx_ctx_arc4;
+};
+
+static void *prism2_wep_init(int keyidx)
+{
+	struct prism2_wep_data *priv;
+
+	if (fips_enabled)
+		return NULL;
+
+	priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
+	if (priv == NULL)
+		return NULL;
+	priv->key_idx = keyidx;
+
+	/* start WEP IV from a random value */
+	get_random_bytes(&priv->iv, 4);
+
+	return priv;
+}
+
+static void prism2_wep_deinit(void *priv)
+{
+	kfree_sensitive(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;
+	struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb +
+				    MAX_DEV_ADDR_SIZE);
+	u32 crc;
+	u8 *icv;
+
+	if (skb_headroom(skb) < 4 || skb_tailroom(skb) < 4 ||
+	    skb->len < hdr_len){
+		pr_err("Error!!! headroom=%d tailroom=%d skblen=%d hdr_len=%d\n",
+		       skb_headroom(skb), skb_tailroom(skb), 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 */
+		crc = ~crc32_le(~0, pos, len);
+		icv = skb_put(skb, 4);
+		icv[0] = crc;
+		icv[1] = crc >> 8;
+		icv[2] = crc >> 16;
+		icv[3] = crc >> 24;
+
+		arc4_setkey(&wep->tx_ctx_arc4, key, klen);
+		arc4_crypt(&wep->tx_ctx_arc4, pos, pos, len + 4);
+	}
+
+	return 0;
+}
+
+/* Perform WEP decryption on given struct 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;
+	struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb +
+				    MAX_DEV_ADDR_SIZE);
+	u32 crc;
+	u8 icv[4];
+
+	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) {
+		arc4_setkey(&wep->rx_ctx_arc4, key, klen);
+		arc4_crypt(&wep->rx_ctx_arc4, pos, pos, 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) {
+			/* 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 void prism2_wep_print_stats(struct seq_file *m, void *priv)
+{
+	struct prism2_wep_data *wep = priv;
+
+	seq_printf(m, "key[%d] alg=WEP len=%d\n", wep->key_idx, wep->key_len);
+}
+
+static struct lib80211_crypto_ops rtllib_crypt_wep = {
+	.name			= "R-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_mpdu_prefix_len  = 4,	/* IV */
+	.extra_mpdu_postfix_len = 4,	/* ICV */
+	.owner			= THIS_MODULE,
+};
+
+static int __init rtllib_crypto_wep_init(void)
+{
+	return lib80211_register_crypto_ops(&rtllib_crypt_wep);
+}
+
+static void __exit rtllib_crypto_wep_exit(void)
+{
+	lib80211_unregister_crypto_ops(&rtllib_crypt_wep);
+}
+
+module_init(rtllib_crypto_wep_init);
+module_exit(rtllib_crypto_wep_exit);
+
+MODULE_LICENSE("GPL");