[PATCH] ieee80211: Hardware crypto and fragmentation offload support

tree 5322d496af90d03ffbec27292dc1a6268a746ede
parent 6c9364386ccb786e4a84427ab3ad712f0b7b8904
author James Ketrenos <jketreno@linux.intel.com> 1124432367 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127311810 -0500

Hardware crypto and fragmentation offload support added (Zhu Yi)
Signed-off-by: James Ketrenos <jketreno@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

include/net/ieee80211.h

@@ -434,12 +434,12 @@ struct ieee80211_device;
 #define SEC_KEY_2		(1<<1)
 #define SEC_KEY_3		(1<<2)
 #define SEC_KEY_4		(1<<3)
-#define SEC_KEY_MASK      (SEC_KEY_1 | SEC_KEY_2 | SEC_KEY_3 | SEC_KEY_4)
 #define SEC_ACTIVE_KEY		(1<<4)
 #define SEC_AUTH_MODE		(1<<5)
 #define SEC_UNICAST_GROUP	(1<<6)
 #define SEC_LEVEL		(1<<7)
 #define SEC_ENABLED		(1<<8)
+#define SEC_TGI_KEY_RESET	(1<<9)
 
 #define SEC_LEVEL_0		0	/* None */
 #define SEC_LEVEL_1		1	/* WEP 40 and 104 bit */
@@ -449,12 +449,15 @@ struct ieee80211_device;
 
 #define WEP_KEYS		4
 #define WEP_KEY_LEN		13
+#define SCM_KEY_LEN		32
+#define SCM_TEMPORAL_KEY_LENGTH	16
 
 struct ieee80211_security {
 	u16 active_key:2,
-	    enabled:1, auth_mode:2, auth_algo:4, unicast_uses_group:1;
+	    enabled:1,
+	    auth_mode:2, auth_algo:4, unicast_uses_group:1, encrypt:1;
 	u8 key_sizes[WEP_KEYS];
-	u8 keys[WEP_KEYS][WEP_KEY_LEN];
+	u8 keys[WEP_KEYS][SCM_KEY_LEN];
 	u8 level;
 	u16 flags;
 } __attribute__ ((packed));
@@ -636,6 +639,7 @@ enum ieee80211_state {
 
 struct ieee80211_device {
 	struct net_device *dev;
+	struct ieee80211_security sec;
 
 	/* Bookkeeping structures */
 	struct net_device_stats stats;

net/ieee80211/ieee80211_tx.c

@@ -231,7 +231,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 	int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size;
 	unsigned long flags;
 	struct net_device_stats *stats = &ieee->stats;
-	int ether_type, encrypt;
+	int ether_type, encrypt, host_encrypt;
 	int bytes, fc, hdr_len;
 	struct sk_buff *skb_frag;
 	struct ieee80211_hdr header = {	/* Ensure zero initialized */
@@ -262,7 +262,8 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 	crypt = ieee->crypt[ieee->tx_keyidx];
 
 	encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
-	    ieee->host_encrypt && crypt && crypt->ops;
+	    ieee->sec.encrypt;
+	host_encrypt = ieee->host_encrypt && encrypt;
 
 	if (!encrypt && ieee->ieee802_1x &&
 	    ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
@@ -280,7 +281,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 	/* Determine total amount of storage required for TXB packets */
 	bytes = skb->len + SNAP_SIZE + sizeof(u16);
 
-	if (encrypt)
+	if (host_encrypt)
 		fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA |
 		    IEEE80211_FCTL_PROTECTED;
 	else
@@ -320,7 +321,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 		bytes_per_frag -= IEEE80211_FCS_LEN;
 
 	/* Each fragment may need to have room for encryptiong pre/postfix */
-	if (encrypt)
+	if (host_encrypt)
 		bytes_per_frag -= crypt->ops->extra_prefix_len +
 		    crypt->ops->extra_postfix_len;
 
@@ -348,7 +349,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 	for (i = 0; i < nr_frags; i++) {
 		skb_frag = txb->fragments[i];
 
-		if (encrypt)
+		if (host_encrypt)
 			skb_reserve(skb_frag, crypt->ops->extra_prefix_len);
 
 		frag_hdr = (struct ieee80211_hdr *)skb_put(skb_frag, hdr_len);
@@ -380,8 +381,22 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 
 		/* Encryption routine will move the header forward in order
 		 * to insert the IV between the header and the payload */
-		if (encrypt)
+		if (host_encrypt)
 			ieee80211_encrypt_fragment(ieee, skb_frag, hdr_len);
+
+		/* ipw2200/2915 Hardware encryption doesn't support TKIP MIC */
+		if (!ieee->host_encrypt && encrypt &&
+		    (ieee->sec.level == SEC_LEVEL_2) &&
+		    crypt && crypt->ops && crypt->ops->encrypt_msdu) {
+			int res = 0;
+			res = crypt->ops->encrypt_msdu(skb_frag, hdr_len,
+						       crypt->priv);
+			if (res < 0) {
+				IEEE80211_ERROR("TKIP MIC encryption failed\n");
+				goto failed;
+			}
+		}
+
 		if (ieee->config &
 		    (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
 			skb_put(skb_frag, 4);

net/ieee80211/ieee80211_wx.c

@@ -278,6 +278,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
 	};
 	int i, key, key_provided, len;
 	struct ieee80211_crypt_data **crypt;
+	int host_crypto = ieee->host_encrypt || ieee->host_decrypt;
 
 	IEEE80211_DEBUG_WX("SET_ENCODE\n");
 
@@ -318,6 +319,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
 
 		if (i == WEP_KEYS) {
 			sec.enabled = 0;
+			sec.encrypt = 0;
 			sec.level = SEC_LEVEL_0;
 			sec.flags |= SEC_ENABLED | SEC_LEVEL;
 		}
@@ -326,6 +328,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
 	}
 
 	sec.enabled = 1;
+	sec.encrypt = 1;
 	sec.flags |= SEC_ENABLED;
 
 	if (*crypt != NULL && (*crypt)->ops != NULL &&
@@ -335,7 +338,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
 		ieee80211_crypt_delayed_deinit(ieee, crypt);
 	}
 
-	if (*crypt == NULL) {
+	if (*crypt == NULL && host_crypto) {
 		struct ieee80211_crypt_data *new_crypt;
 
 		/* take WEP into use */
@@ -375,6 +378,7 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
 				   key, escape_essid(sec.keys[key], len),
 				   erq->length, len);
 		sec.key_sizes[key] = len;
+		if (*crypt)
 			(*crypt)->ops->set_key(sec.keys[key], len, NULL,
 					       (*crypt)->priv);
 		sec.flags |= (1 << key);
@@ -382,24 +386,26 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
 		 * explicitely set */
 		if (key == sec.active_key)
 			sec.flags |= SEC_ACTIVE_KEY;
+
 	} else {
+		if (host_crypto) {
 			len = (*crypt)->ops->get_key(sec.keys[key], WEP_KEY_LEN,
 						     NULL, (*crypt)->priv);
 			if (len == 0) {
 				/* Set a default key of all 0 */
-			IEEE80211_DEBUG_WX("Setting key %d to all zero.\n",
-					   key);
+				IEEE80211_DEBUG_WX("Setting key %d to all "
+						   "zero.\n", key);
 				memset(sec.keys[key], 0, 13);
 				(*crypt)->ops->set_key(sec.keys[key], 13, NULL,
 						       (*crypt)->priv);
 				sec.key_sizes[key] = 13;
 				sec.flags |= (1 << key);
 			}
-
+		}
 		/* No key data - just set the default TX key index */
 		if (key_provided) {
-			IEEE80211_DEBUG_WX
-			    ("Setting key %d to default Tx key.\n", key);
+			IEEE80211_DEBUG_WX("Setting key %d to default Tx "
+					   "key.\n", key);
 			ieee->tx_keyidx = key;
 			sec.active_key = key;
 			sec.flags |= SEC_ACTIVE_KEY;
@@ -442,6 +448,7 @@ int ieee80211_wx_get_encode(struct ieee80211_device *ieee,
 	struct iw_point *erq = &(wrqu->encoding);
 	int len, key;
 	struct ieee80211_crypt_data *crypt;
+	struct ieee80211_security *sec = &ieee->sec;
 
 	IEEE80211_DEBUG_WX("GET_ENCODE\n");
 
@@ -456,13 +463,13 @@ int ieee80211_wx_get_encode(struct ieee80211_device *ieee,
 	crypt = ieee->crypt[key];
 	erq->flags = key + 1;
 
-	if (crypt == NULL || crypt->ops == NULL) {
+	if (!sec->enabled) {
 		erq->length = 0;
 		erq->flags |= IW_ENCODE_DISABLED;
 		return 0;
 	}
 
-	if (strcmp(crypt->ops->name, "WEP") != 0) {
+	if (sec->level != SEC_LEVEL_1) {
 		/* only WEP is supported with wireless extensions, so just
 		 * report that encryption is used */
 		erq->length = 0;
@@ -470,9 +477,10 @@ int ieee80211_wx_get_encode(struct ieee80211_device *ieee,
 		return 0;
 	}
 
-	len = crypt->ops->get_key(keybuf, WEP_KEY_LEN, NULL, crypt->priv);
-	erq->length = (len >= 0 ? len : 0);
+	len = sec->key_sizes[key];
+	memcpy(keybuf, sec->keys[key], len);
 
+	erq->length = (len >= 0 ? len : 0);
 	erq->flags |= IW_ENCODE_ENABLED;
 
 	if (ieee->open_wep)