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path: root/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
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Diffstat (limited to 'drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c')
-rw-r--r--drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c421
1 files changed, 0 insertions, 421 deletions
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
deleted file mode 100644
index f17d07dad56d..000000000000
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_ccmp.c
+++ /dev/null
@@ -1,421 +0,0 @@
-// 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 "ieee80211.h"
-
-#include <linux/crypto.h>
-#include <crypto/aead.h>
- #include <linux/scatterlist.h>
-
-MODULE_AUTHOR("Jouni Malinen");
-MODULE_DESCRIPTION("Host AP crypt: CCMP");
-MODULE_LICENSE("GPL");
-
-#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 ieee80211_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_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 *ieee80211_ccmp_init(int key_idx)
-{
- struct ieee80211_ccmp_data *priv;
-
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (!priv)
- 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("ieee80211_crypt_ccmp: 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 ieee80211_ccmp_deinit(void *priv)
-{
- struct ieee80211_ccmp_data *_priv = priv;
-
- if (_priv && _priv->tfm)
- crypto_free_aead(_priv->tfm);
- kfree(priv);
-}
-
-static int ccmp_init_iv_and_aad(struct rtl_80211_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 & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
- (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS));
- /* qc_included = ((WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA) &&
- * (WLAN_FC_GET_STYPE(fc) & 0x08));
- */
- /* fixed by David :2006.9.6 */
- qc_included = (WLAN_FC_GET_TYPE(fc) == IEEE80211_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 ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
-{
- struct ieee80211_ccmp_data *key = priv;
- int i;
- u8 *pos;
- struct rtl_80211_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;
- /* 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) | BIT(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 rtl_80211_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;
- size_t 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 ieee80211_ccmp_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
-{
- struct ieee80211_ccmp_data *key = priv;
- u8 keyidx, *pos;
- struct rtl_80211_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->dot11RSNAStatsCCMPFormatErrors++;
- return -1;
- }
-
- hdr = (struct rtl_80211_hdr_4addr *)skb->data;
- pos = skb->data + hdr_len;
- keyidx = pos[3];
- if (!(keyidx & BIT(5))) {
- if (net_ratelimit()) {
- netdev_dbg(skb->dev, "CCMP: received packet without ExtIV flag from %pM\n",
- hdr->addr2);
- }
- key->dot11RSNAStatsCCMPFormatErrors++;
- return -2;
- }
- keyidx >>= 6;
- if (key->key_idx != keyidx) {
- netdev_dbg(skb->dev, "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()) {
- netdev_dbg(skb->dev, "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) {
- if (net_ratelimit()) {
- netdev_dbg(skb->dev, "CCMP: replay detected: STA=%pM previous PN %pm received PN %pm\n",
- hdr->addr2, key->rx_pn, pn);
- }
- key->dot11RSNAStatsCCMPReplays++;
- return -4;
- }
- if (!tcb_desc->bHwSec) {
- struct aead_request *req;
- struct scatterlist sg[2];
- u8 *aad = key->rx_aad;
- u8 iv[AES_BLOCK_LEN];
- int aad_len, ret;
- size_t 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, 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()) {
- netdev_dbg(skb->dev, "CCMP: decrypt failed: STA=%pM\n",
- 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 ieee80211_ccmp_set_key(void *key, int len, u8 *seq, void *priv)
-{
- struct ieee80211_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;
- 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(tfm, CCMP_MIC_LEN) ||
- crypto_aead_setkey(tfm, data->key, CCMP_TK_LEN))
- return -1;
- } else if (len == 0) {
- data->key_set = 0;
- } else {
- return -1;
- }
-
- return 0;
-}
-
-static int ieee80211_ccmp_get_key(void *key, int len, u8 *seq, void *priv)
-{
- struct ieee80211_ccmp_data *data = priv;
-
- if (len < CCMP_TK_LEN)
- return 0;
-
- 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 *ieee80211_ccmp_print_stats(char *p, void *priv)
-{
- struct ieee80211_ccmp_data *ccmp = priv;
-
- p += sprintf(p, "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->dot11RSNAStatsCCMPFormatErrors,
- ccmp->dot11RSNAStatsCCMPReplays,
- ccmp->dot11RSNAStatsCCMPDecryptErrors);
-
- return p;
-}
-
-static struct ieee80211_crypto_ops ieee80211_crypt_ccmp = {
- .name = "CCMP",
- .init = ieee80211_ccmp_init,
- .deinit = ieee80211_ccmp_deinit,
- .encrypt_mpdu = ieee80211_ccmp_encrypt,
- .decrypt_mpdu = ieee80211_ccmp_decrypt,
- .encrypt_msdu = NULL,
- .decrypt_msdu = NULL,
- .set_key = ieee80211_ccmp_set_key,
- .get_key = ieee80211_ccmp_get_key,
- .print_stats = ieee80211_ccmp_print_stats,
- .extra_prefix_len = CCMP_HDR_LEN,
- .extra_postfix_len = CCMP_MIC_LEN,
- .owner = THIS_MODULE,
-};
-
-int __init ieee80211_crypto_ccmp_init(void)
-{
- return ieee80211_register_crypto_ops(&ieee80211_crypt_ccmp);
-}
-
-void ieee80211_crypto_ccmp_exit(void)
-{
- ieee80211_unregister_crypto_ops(&ieee80211_crypt_ccmp);
-}