mac80111: Add BIP-CMAC-256 cipher

This allows mac80211 to configure BIP-CMAC-256 to the driver and also
use software-implementation within mac80211 when the driver does not
support this with hardware accelaration.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

11 files changed, 180 insertions, 21 deletions

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index dbf417bf25bf..b9c7897dc566 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -1017,6 +1017,15 @@ struct ieee80211_mmie {
         u8 mic[8];
 } __packed;
 
+/* Management MIC information element (IEEE 802.11w) for GMAC and CMAC-256 */
+struct ieee80211_mmie_16 {
+        u8 element_id;
+        u8 length;
+        __le16 key_id;
+        u8 sequence_number[6];
+        u8 mic[16];
+} __packed;
+
 struct ieee80211_vendor_ie {
         u8 element_id;
         u8 len;
diff --git a/net/mac80211/aes_cmac.c b/net/mac80211/aes_cmac.c
index 9b9009f99551..4192806be3d3 100644
--- a/net/mac80211/aes_cmac.c
+++ b/net/mac80211/aes_cmac.c
@@ -18,8 +18,8 @@
 #include "key.h"
 #include "aes_cmac.h"
 
-#define AES_CMAC_KEY_LEN 16
 #define CMAC_TLEN 8 /* CMAC TLen = 64 bits (8 octets) */
+#define CMAC_TLEN_256 16 /* CMAC TLen = 128 bits (16 octets) */
 #define AAD_LEN 20
 
 
@@ -35,9 +35,9 @@ static void gf_mulx(u8 *pad)
                 pad[AES_BLOCK_SIZE - 1] ^= 0x87;
 }
 
-
-static void aes_128_cmac_vector(struct crypto_cipher *tfm, size_t num_elem,
-                                const u8 *addr[], const size_t *len, u8 *mac)
+static void aes_cmac_vector(struct crypto_cipher *tfm, size_t num_elem,
+                            const u8 *addr[], const size_t *len, u8 *mac,
+                            size_t mac_len)
 {
         u8 cbc[AES_BLOCK_SIZE], pad[AES_BLOCK_SIZE];
         const u8 *pos, *end;
@@ -88,7 +88,7 @@ static void aes_128_cmac_vector(struct crypto_cipher *tfm, size_t num_elem,
         for (i = 0; i < AES_BLOCK_SIZE; i++)
                 pad[i] ^= cbc[i];
         crypto_cipher_encrypt_one(tfm, pad, pad);
-        memcpy(mac, pad, CMAC_TLEN);
+        memcpy(mac, pad, mac_len);
 }
 
 
@@ -107,17 +107,35 @@ void ieee80211_aes_cmac(struct crypto_cipher *tfm, const u8 *aad,
         addr[2] = zero;
         len[2] = CMAC_TLEN;
 
-        aes_128_cmac_vector(tfm, 3, addr, len, mic);
+        aes_cmac_vector(tfm, 3, addr, len, mic, CMAC_TLEN);
 }
 
+void ieee80211_aes_cmac_256(struct crypto_cipher *tfm, const u8 *aad,
+                            const u8 *data, size_t data_len, u8 *mic)
+{
+        const u8 *addr[3];
+        size_t len[3];
+        u8 zero[CMAC_TLEN_256];
+
+        memset(zero, 0, CMAC_TLEN_256);
+        addr[0] = aad;
+        len[0] = AAD_LEN;
+        addr[1] = data;
+        len[1] = data_len - CMAC_TLEN_256;
+        addr[2] = zero;
+        len[2] = CMAC_TLEN_256;
+
+        aes_cmac_vector(tfm, 3, addr, len, mic, CMAC_TLEN_256);
+}
 
-struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[])
+struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[],
+                                                   size_t key_len)
 {
         struct crypto_cipher *tfm;
 
         tfm = crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC);
         if (!IS_ERR(tfm))
-                crypto_cipher_setkey(tfm, key, AES_CMAC_KEY_LEN);
+                crypto_cipher_setkey(tfm, key, key_len);
 
         return tfm;
 }
diff --git a/net/mac80211/aes_cmac.h b/net/mac80211/aes_cmac.h
index 0ce6487af795..3702041f44fd 100644
--- a/net/mac80211/aes_cmac.h
+++ b/net/mac80211/aes_cmac.h
@@ -11,9 +11,12 @@
 
 #include <linux/crypto.h>
 
-struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[]);
+struct crypto_cipher *ieee80211_aes_cmac_key_setup(const u8 key[],
+                                                   size_t key_len);
 void ieee80211_aes_cmac(struct crypto_cipher *tfm, const u8 *aad,
                         const u8 *data, size_t data_len, u8 *mic);
+void ieee80211_aes_cmac_256(struct crypto_cipher *tfm, const u8 *aad,
+                            const u8 *data, size_t data_len, u8 *mic);
 void ieee80211_aes_cmac_key_free(struct crypto_cipher *tfm);
 
 #endif /* AES_CMAC_H */
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index ef84441c119c..b7e528bbecce 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -164,6 +164,7 @@ static int ieee80211_add_key(struct wiphy *wiphy, struct net_device *dev,
         case WLAN_CIPHER_SUITE_CCMP:
         case WLAN_CIPHER_SUITE_CCMP_256:
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
         case WLAN_CIPHER_SUITE_GCMP:
         case WLAN_CIPHER_SUITE_GCMP_256:
                 break;
@@ -362,6 +363,7 @@ static int ieee80211_get_key(struct wiphy *wiphy, struct net_device *dev,
                 params.seq_len = 6;
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
                 seq[0] = pn64;
                 seq[1] = pn64 >> 8;
diff --git a/net/mac80211/debugfs_key.c b/net/mac80211/debugfs_key.c
index 64de07b16092..d1b60eb014a8 100644
--- a/net/mac80211/debugfs_key.c
+++ b/net/mac80211/debugfs_key.c
@@ -101,6 +101,7 @@ static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
                                 (u8)(pn >> 16), (u8)(pn >> 8), (u8)pn);
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 pn = atomic64_read(&key->u.aes_cmac.tx_pn);
                 len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
                                 (u8)(pn >> 40), (u8)(pn >> 32), (u8)(pn >> 24),
@@ -153,6 +154,7 @@ static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
                 len = p - buf;
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 rpn = key->u.aes_cmac.rx_pn;
                 p += scnprintf(p, sizeof(buf)+buf-p,
                                "%02x%02x%02x%02x%02x%02x\n",
@@ -191,6 +193,7 @@ static ssize_t key_replays_read(struct file *file, char __user *userbuf,
                 len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 len = scnprintf(buf, sizeof(buf), "%u\n",
                                 key->u.aes_cmac.replays);
                 break;
@@ -214,6 +217,7 @@ static ssize_t key_icverrors_read(struct file *file, char __user *userbuf,
 
         switch (key->conf.cipher) {
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 len = scnprintf(buf, sizeof(buf), "%u\n",
                                 key->u.aes_cmac.icverrors);
                 break;
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index 83c61085c3f0..7ceea9d9fcd2 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -165,6 +165,7 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
         case WLAN_CIPHER_SUITE_CCMP:
         case WLAN_CIPHER_SUITE_CCMP_256:
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
         case WLAN_CIPHER_SUITE_GCMP:
         case WLAN_CIPHER_SUITE_GCMP_256:
                 /* all of these we can do in software - if driver can */
@@ -417,8 +418,12 @@ ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
                 }
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 key->conf.iv_len = 0;
-                key->conf.icv_len = sizeof(struct ieee80211_mmie);
+                if (cipher == WLAN_CIPHER_SUITE_AES_CMAC)
+                        key->conf.icv_len = sizeof(struct ieee80211_mmie);
+                else
+                        key->conf.icv_len = sizeof(struct ieee80211_mmie_16);
                 if (seq)
                         for (j = 0; j < IEEE80211_CMAC_PN_LEN; j++)
                                 key->u.aes_cmac.rx_pn[j] =
@@ -428,7 +433,7 @@ ieee80211_key_alloc(u32 cipher, int idx, size_t key_len,
                  * it does not need to be initialized for every packet.
                  */
                 key->u.aes_cmac.tfm =
-                        ieee80211_aes_cmac_key_setup(key_data);
+                        ieee80211_aes_cmac_key_setup(key_data, key_len);
                 if (IS_ERR(key->u.aes_cmac.tfm)) {
                         err = PTR_ERR(key->u.aes_cmac.tfm);
                         kfree(key);
@@ -481,6 +486,7 @@ static void ieee80211_key_free_common(struct ieee80211_key *key)
                 ieee80211_aes_key_free(key->u.ccmp.tfm);
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 ieee80211_aes_cmac_key_free(key->u.aes_cmac.tfm);
                 break;
         case WLAN_CIPHER_SUITE_GCMP:
@@ -804,6 +810,7 @@ void ieee80211_get_key_tx_seq(struct ieee80211_key_conf *keyconf,
                 seq->ccmp.pn[0] = pn64 >> 40;
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 pn64 = atomic64_read(&key->u.aes_cmac.tx_pn);
                 seq->ccmp.pn[5] = pn64;
                 seq->ccmp.pn[4] = pn64 >> 8;
@@ -854,6 +861,7 @@ void ieee80211_get_key_rx_seq(struct ieee80211_key_conf *keyconf,
                 memcpy(seq->ccmp.pn, pn, IEEE80211_CCMP_PN_LEN);
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 if (WARN_ON(tid != 0))
                         return;
                 pn = key->u.aes_cmac.rx_pn;
@@ -897,6 +905,7 @@ void ieee80211_set_key_tx_seq(struct ieee80211_key_conf *keyconf,
                 atomic64_set(&key->u.ccmp.tx_pn, pn64);
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 pn64 = (u64)seq->aes_cmac.pn[5] |
                        ((u64)seq->aes_cmac.pn[4] << 8) |
                        ((u64)seq->aes_cmac.pn[3] << 16) |
@@ -948,6 +957,7 @@ void ieee80211_set_key_rx_seq(struct ieee80211_key_conf *keyconf,
                 memcpy(pn, seq->ccmp.pn, IEEE80211_CCMP_PN_LEN);
                 break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                 if (WARN_ON(tid != 0))
                         return;
                 pn = key->u.aes_cmac.rx_pn;
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index a5ad2d5bb29b..053a17c5023a 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -671,7 +671,8 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
                 WLAN_CIPHER_SUITE_GCMP_256,
 
                 /* keep last -- depends on hw flags! */
-                WLAN_CIPHER_SUITE_AES_CMAC
+                WLAN_CIPHER_SUITE_AES_CMAC,
+                WLAN_CIPHER_SUITE_BIP_CMAC_256,
         };
 
         if (local->hw.flags & IEEE80211_HW_SW_CRYPTO_CONTROL ||
@@ -710,7 +711,7 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 
                 if (!have_mfp)
-                        local->hw.wiphy->n_cipher_suites--;
+                        local->hw.wiphy->n_cipher_suites -= 2;
 
                 if (!have_wep) {
                         local->hw.wiphy->cipher_suites += 2;
@@ -736,9 +737,9 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
                 if (have_wep)
                         n_suites += 2;
 
-                /* check if we have AES_CMAC */
+                /* check if we have AES_CMAC, BIP-CMAC-256 */
                 if (have_mfp)
-                        n_suites++;
+                        n_suites += 2;
 
                 suites = kmalloc(sizeof(u32) * n_suites, GFP_KERNEL);
                 if (!suites)
@@ -755,8 +756,10 @@ static int ieee80211_init_cipher_suites(struct ieee80211_local *local)
                         suites[w++] = WLAN_CIPHER_SUITE_WEP104;
                 }
 
-                if (have_mfp)
+                if (have_mfp) {
                         suites[w++] = WLAN_CIPHER_SUITE_AES_CMAC;
+                        suites[w++] = WLAN_CIPHER_SUITE_BIP_CMAC_256;
+                }
 
                 for (r = 0; r < local->hw.n_cipher_schemes; r++)
                         suites[w++] = cs[r].cipher;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index e8c6ba5ce70b..93ebc9525478 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -647,6 +647,7 @@ static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 {
         struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data;
         struct ieee80211_mmie *mmie;
+        struct ieee80211_mmie_16 *mmie16;
 
         if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da))
                 return -1;
@@ -656,11 +657,18 @@ static int ieee80211_get_mmie_keyidx(struct sk_buff *skb)
 
         mmie = (struct ieee80211_mmie *)
                 (skb->data + skb->len - sizeof(*mmie));
-        if (mmie->element_id != WLAN_EID_MMIE ||
-            mmie->length != sizeof(*mmie) - 2)
-                return -1;
-
-        return le16_to_cpu(mmie->key_id);
+        if (mmie->element_id == WLAN_EID_MMIE &&
+            mmie->length == sizeof(*mmie) - 2)
+                return le16_to_cpu(mmie->key_id);
+
+        mmie16 = (struct ieee80211_mmie_16 *)
+                (skb->data + skb->len - sizeof(*mmie16));
+        if (skb->len >= 24 + sizeof(*mmie16) &&
+            mmie16->element_id == WLAN_EID_MMIE &&
+            mmie16->length == sizeof(*mmie16) - 2)
+                return le16_to_cpu(mmie16->key_id);
+
+        return -1;
 }
 
 static int iwl80211_get_cs_keyid(const struct ieee80211_cipher_scheme *cs,
@@ -1660,6 +1668,9 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
         case WLAN_CIPHER_SUITE_AES_CMAC:
                 result = ieee80211_crypto_aes_cmac_decrypt(rx);
                 break;
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+                result = ieee80211_crypto_aes_cmac_256_decrypt(rx);
+                break;
         case WLAN_CIPHER_SUITE_GCMP:
         case WLAN_CIPHER_SUITE_GCMP_256:
                 result = ieee80211_crypto_gcmp_decrypt(rx);
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index be57e0afd019..909c27be1fdc 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -639,6 +639,7 @@ ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
                                         ieee80211_is_mgmt(hdr->frame_control);
                         break;
                 case WLAN_CIPHER_SUITE_AES_CMAC:
+                case WLAN_CIPHER_SUITE_BIP_CMAC_256:
                         if (!ieee80211_is_mgmt(hdr->frame_control))
                                 tx->key = NULL;
                         break;
@@ -1021,6 +1022,8 @@ ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
                         tx, IEEE80211_CCMP_256_MIC_LEN);
         case WLAN_CIPHER_SUITE_AES_CMAC:
                 return ieee80211_crypto_aes_cmac_encrypt(tx);
+        case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+                return ieee80211_crypto_aes_cmac_256_encrypt(tx);
         case WLAN_CIPHER_SUITE_GCMP:
         case WLAN_CIPHER_SUITE_GCMP_256:
                 return ieee80211_crypto_gcmp_encrypt(tx);
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index ae654de9782a..549af118de9f 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -955,6 +955,48 @@ ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
         return TX_CONTINUE;
 }
 
+ieee80211_tx_result
+ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
+{
+        struct sk_buff *skb;
+        struct ieee80211_tx_info *info;
+        struct ieee80211_key *key = tx->key;
+        struct ieee80211_mmie_16 *mmie;
+        u8 aad[20];
+        u64 pn64;
+
+        if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
+                return TX_DROP;
+
+        skb = skb_peek(&tx->skbs);
+
+        info = IEEE80211_SKB_CB(skb);
+
+        if (info->control.hw_key)
+                return TX_CONTINUE;
+
+        if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
+                return TX_DROP;
+
+        mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
+        mmie->element_id = WLAN_EID_MMIE;
+        mmie->length = sizeof(*mmie) - 2;
+        mmie->key_id = cpu_to_le16(key->conf.keyidx);
+
+        /* PN = PN + 1 */
+        pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn);
+
+        bip_ipn_set64(mmie->sequence_number, pn64);
+
+        bip_aad(skb, aad);
+
+        /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
+         */
+        ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
+                               skb->data + 24, skb->len - 24, mmie->mic);
+
+        return TX_CONTINUE;
+}
 
 ieee80211_rx_result
 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
@@ -1006,6 +1048,56 @@ ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
         return RX_CONTINUE;
 }
 
+ieee80211_rx_result
+ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
+{
+        struct sk_buff *skb = rx->skb;
+        struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
+        struct ieee80211_key *key = rx->key;
+        struct ieee80211_mmie_16 *mmie;
+        u8 aad[20], mic[16], ipn[6];
+        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+
+        if (!ieee80211_is_mgmt(hdr->frame_control))
+                return RX_CONTINUE;
+
+        /* management frames are already linear */
+
+        if (skb->len < 24 + sizeof(*mmie))
+                return RX_DROP_UNUSABLE;
+
+        mmie = (struct ieee80211_mmie_16 *)
+                (skb->data + skb->len - sizeof(*mmie));
+        if (mmie->element_id != WLAN_EID_MMIE ||
+            mmie->length != sizeof(*mmie) - 2)
+                return RX_DROP_UNUSABLE; /* Invalid MMIE */
+
+        bip_ipn_swap(ipn, mmie->sequence_number);
+
+        if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
+                key->u.aes_cmac.replays++;
+                return RX_DROP_UNUSABLE;
+        }
+
+        if (!(status->flag & RX_FLAG_DECRYPTED)) {
+                /* hardware didn't decrypt/verify MIC */
+                bip_aad(skb, aad);
+                ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
+                                       skb->data + 24, skb->len - 24, mic);
+                if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
+                        key->u.aes_cmac.icverrors++;
+                        return RX_DROP_UNUSABLE;
+                }
+        }
+
+        memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
+
+        /* Remove MMIE */
+        skb_trim(skb, skb->len - sizeof(*mmie));
+
+        return RX_CONTINUE;
+}
+
 ieee80211_tx_result
 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
 {
diff --git a/net/mac80211/wpa.h b/net/mac80211/wpa.h
index 43e109f27a89..06b7f167a176 100644
--- a/net/mac80211/wpa.h
+++ b/net/mac80211/wpa.h
@@ -32,8 +32,12 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
 
 ieee80211_tx_result
 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx);
+ieee80211_tx_result
+ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx);
 ieee80211_rx_result
 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx);
+ieee80211_rx_result
+ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx);
 ieee80211_tx_result
 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx);
 ieee80211_rx_result