Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 411 insertions, 0 deletions

diff --git a/drivers/staging/rtl8192e/rtllib_crypt_ccmp.c b/drivers/staging/rtl8192e/rtllib_crypt_ccmp.c
new file mode 100644
index 000000000..f88096bcb
--- /dev/null
+++ b/drivers/staging/rtl8192e/rtllib_crypt_ccmp.c
@@ -0,0 +1,411 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Host AP crypt: host-based CCMP encryption implementation for Host AP driver
+ *
+ * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi>
+ */
+
+#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/string.h>
+#include <linux/wireless.h>
+#include "rtllib.h"
+
+#include <linux/crypto.h>
+#include <crypto/aead.h>
+
+#include <linux/scatterlist.h>
+
+#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 rtllib_ccmp_data {
+	u8 key[CCMP_TK_LEN];
+	int key_set;
+
+	u8 tx_pn[CCMP_PN_LEN];
+	u8 rx_pn[CCMP_PN_LEN];
+
+	u32 dot11rsna_stats_ccmp_format_errors;
+	u32 dot11rsna_stats_ccmp_replays;
+	u32 dot11rsna_stats_ccmp_decrypt_errors;
+
+	int key_idx;
+
+	struct crypto_aead *tfm;
+
+	/* scratch buffers for virt_to_page() (crypto API) */
+	u8 tx_aad[2 * AES_BLOCK_LEN];
+	u8 rx_aad[2 * AES_BLOCK_LEN];
+};
+
+static void *rtllib_ccmp_init(int key_idx)
+{
+	struct rtllib_ccmp_data *priv;
+
+	priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
+	if (priv == NULL)
+		goto fail;
+	priv->key_idx = key_idx;
+
+	priv->tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
+	if (IS_ERR(priv->tfm)) {
+		pr_debug("Could not allocate crypto API aes\n");
+		priv->tfm = NULL;
+		goto fail;
+	}
+	return priv;
+
+fail:
+	if (priv) {
+		if (priv->tfm)
+			crypto_free_aead(priv->tfm);
+		kfree(priv);
+	}
+
+	return NULL;
+}
+
+static void rtllib_ccmp_deinit(void *priv)
+{
+	struct rtllib_ccmp_data *_priv = priv;
+
+	if (_priv && _priv->tfm)
+		crypto_free_aead(_priv->tfm);
+	kfree(priv);
+}
+
+static int ccmp_init_iv_and_aad(struct rtllib_hdr_4addr *hdr,
+				u8 *pn, u8 *iv, u8 *aad)
+{
+	u8 *pos, qc = 0;
+	size_t aad_len;
+	u16 fc;
+	int a4_included, qc_included;
+
+	fc = le16_to_cpu(hdr->frame_ctl);
+	a4_included = ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
+		       (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS));
+
+	qc_included = ((WLAN_FC_GET_TYPE(fc) == RTLLIB_FTYPE_DATA) &&
+		       (WLAN_FC_GET_STYPE(fc) & 0x80));
+	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;
+	}
+	/* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
+	 * mode authentication are not allowed to collide, yet both are derived
+	 * from the same vector. We only set L := 1 here to indicate that the
+	 * data size can be represented in (L+1) bytes. The CCM layer will take
+	 * care of storing the data length in the top (L+1) bytes and setting
+	 * and clearing the other bits as is required to derive the two IVs.
+	 */
+	iv[0] = 0x1;
+
+	/* Nonce: QC | A2 | PN */
+	iv[1] = qc;
+	memcpy(iv + 2, hdr->addr2, ETH_ALEN);
+	memcpy(iv + 8, pn, CCMP_PN_LEN);
+
+	/* 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] = pos[0] & 0x8f;
+	aad[1] = pos[1] & 0xc7;
+	memcpy(&aad[2], &hdr->addr1, ETH_ALEN);
+	memcpy(&aad[8], &hdr->addr2, ETH_ALEN);
+	memcpy(&aad[14], &hdr->addr3, ETH_ALEN);
+	pos = (u8 *)&hdr->seq_ctl;
+	aad[20] = pos[0] & 0x0f;
+	aad[21] = 0; /* all bits masked */
+	memset(aad + 22, 0, 8);
+	if (a4_included)
+		memcpy(aad + 22, hdr->addr4, ETH_ALEN);
+	if (qc_included) {
+		aad[a4_included ? 28 : 22] = qc;
+		/* rest of QC masked */
+	}
+
+	return aad_len;
+}
+
+static int rtllib_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+	struct rtllib_ccmp_data *key = priv;
+	int i;
+	u8 *pos;
+	struct rtllib_hdr_4addr *hdr;
+	struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb +
+				    MAX_DEV_ADDR_SIZE);
+	if (skb_headroom(skb) < CCMP_HDR_LEN ||
+	    skb_tailroom(skb) < CCMP_MIC_LEN ||
+	    skb->len < hdr_len)
+		return -1;
+
+	pos = skb_push(skb, CCMP_HDR_LEN);
+	memmove(pos, pos + CCMP_HDR_LEN, hdr_len);
+	pos += hdr_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 rtllib_hdr_4addr *)skb->data;
+	if (!tcb_desc->bHwSec) {
+		struct aead_request *req;
+		struct scatterlist sg[2];
+		u8 *aad = key->tx_aad;
+		u8 iv[AES_BLOCK_LEN];
+		int aad_len, ret;
+		int data_len = skb->len - hdr_len - CCMP_HDR_LEN;
+
+		req = aead_request_alloc(key->tfm, GFP_ATOMIC);
+		if (!req)
+			return -ENOMEM;
+
+		aad_len = ccmp_init_iv_and_aad(hdr, key->tx_pn, iv, aad);
+
+		skb_put(skb, CCMP_MIC_LEN);
+		sg_init_table(sg, 2);
+		sg_set_buf(&sg[0], aad, aad_len);
+		sg_set_buf(&sg[1], skb->data + hdr_len + CCMP_HDR_LEN,
+			   data_len + CCMP_MIC_LEN);
+
+		aead_request_set_callback(req, 0, NULL, NULL);
+		aead_request_set_ad(req, aad_len);
+		aead_request_set_crypt(req, sg, sg, data_len, iv);
+
+		ret = crypto_aead_encrypt(req);
+		aead_request_free(req);
+
+		return ret;
+	}
+
+	return 0;
+}
+
+static int rtllib_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+	struct rtllib_ccmp_data *key = priv;
+	u8 keyidx, *pos;
+	struct rtllib_hdr_4addr *hdr;
+	struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb +
+				    MAX_DEV_ADDR_SIZE);
+	u8 pn[6];
+
+	if (skb->len < hdr_len + CCMP_HDR_LEN + CCMP_MIC_LEN) {
+		key->dot11rsna_stats_ccmp_format_errors++;
+		return -1;
+	}
+
+	hdr = (struct rtllib_hdr_4addr *)skb->data;
+	pos = skb->data + hdr_len;
+	keyidx = pos[3];
+	if (!(keyidx & (1 << 5))) {
+		if (net_ratelimit()) {
+			pr_debug("CCMP: received packet without ExtIV flag from %pM\n",
+				 hdr->addr2);
+		}
+		key->dot11rsna_stats_ccmp_format_errors++;
+		return -2;
+	}
+	keyidx >>= 6;
+	if (key->key_idx != keyidx) {
+		pr_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()) {
+			pr_debug("CCMP: received packet from %pM with keyid=%d that does not have a configured key\n",
+				 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) {
+		key->dot11rsna_stats_ccmp_replays++;
+		return -4;
+	}
+	if (!tcb_desc->bHwSec) {
+		size_t data_len = skb->len - hdr_len - CCMP_HDR_LEN;
+		struct aead_request *req;
+		struct scatterlist sg[2];
+		u8 *aad = key->rx_aad;
+		u8 iv[AES_BLOCK_LEN];
+		int aad_len, ret;
+
+		req = aead_request_alloc(key->tfm, GFP_ATOMIC);
+		if (!req)
+			return -ENOMEM;
+
+		aad_len = ccmp_init_iv_and_aad(hdr, pn, iv, aad);
+
+		sg_init_table(sg, 2);
+		sg_set_buf(&sg[0], aad, aad_len);
+		sg_set_buf(&sg[1], pos, data_len);
+
+		aead_request_set_callback(req, 0, NULL, NULL);
+		aead_request_set_ad(req, aad_len);
+		aead_request_set_crypt(req, sg, sg, data_len, iv);
+
+		ret = crypto_aead_decrypt(req);
+		aead_request_free(req);
+
+		if (ret) {
+			if (net_ratelimit()) {
+				pr_debug("CCMP: decrypt failed: STA= %pM\n",
+					 hdr->addr2);
+			}
+			key->dot11rsna_stats_ccmp_decrypt_errors++;
+			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 rtllib_ccmp_set_key(void *key, int len, u8 *seq, void *priv)
+{
+	struct rtllib_ccmp_data *data = priv;
+	int keyidx;
+	struct crypto_aead *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];
+		}
+		if (crypto_aead_setauthsize(data->tfm, CCMP_MIC_LEN) ||
+		    crypto_aead_setkey(data->tfm, data->key, CCMP_TK_LEN))
+			return -1;
+	} else if (len == 0) {
+		data->key_set = 0;
+	} else {
+		return -1;
+	}
+
+	return 0;
+}
+
+static int rtllib_ccmp_get_key(void *key, int len, u8 *seq, void *priv)
+{
+	struct rtllib_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 void rtllib_ccmp_print_stats(struct seq_file *m, void *priv)
+{
+	struct rtllib_ccmp_data *ccmp = priv;
+
+	seq_printf(m,
+		   "key[%d] alg=CCMP key_set=%d tx_pn=%pM rx_pn=%pM format_errors=%d replays=%d decrypt_errors=%d\n",
+		   ccmp->key_idx, ccmp->key_set,
+		   ccmp->tx_pn, ccmp->rx_pn,
+		   ccmp->dot11rsna_stats_ccmp_format_errors,
+		   ccmp->dot11rsna_stats_ccmp_replays,
+		   ccmp->dot11rsna_stats_ccmp_decrypt_errors);
+}
+
+static struct lib80211_crypto_ops rtllib_crypt_ccmp = {
+	.name			= "R-CCMP",
+	.init			= rtllib_ccmp_init,
+	.deinit			= rtllib_ccmp_deinit,
+	.encrypt_mpdu		= rtllib_ccmp_encrypt,
+	.decrypt_mpdu		= rtllib_ccmp_decrypt,
+	.encrypt_msdu		= NULL,
+	.decrypt_msdu		= NULL,
+	.set_key		= rtllib_ccmp_set_key,
+	.get_key		= rtllib_ccmp_get_key,
+	.print_stats		= rtllib_ccmp_print_stats,
+	.extra_mpdu_prefix_len = CCMP_HDR_LEN,
+	.extra_mpdu_postfix_len = CCMP_MIC_LEN,
+	.owner			= THIS_MODULE,
+};
+
+static int __init rtllib_crypto_ccmp_init(void)
+{
+	return lib80211_register_crypto_ops(&rtllib_crypt_ccmp);
+}
+
+static void __exit rtllib_crypto_ccmp_exit(void)
+{
+	lib80211_unregister_crypto_ops(&rtllib_crypt_ccmp);
+}
+
+module_init(rtllib_crypto_ccmp_init);
+module_exit(rtllib_crypto_ccmp_exit);
+
+MODULE_LICENSE("GPL");