[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>

3 files changed, 75 insertions, 48 deletions

diff --git a/include/net/ieee80211.h b/include/net/ieee80211.h
index ed06a9454edc..fa14360dbc9d 100644
--- a/include/net/ieee80211.h
+++ b/include/net/ieee80211.h
@@ -430,31 +430,34 @@ struct ieee80211_device;
 
 #include "ieee80211_crypt.h"
 
-#define SEC_KEY_1         (1<<0)
-#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_LEVEL_0      0      /* None */
-#define SEC_LEVEL_1      1      /* WEP 40 and 104 bit */
-#define SEC_LEVEL_2      2      /* Level 1 + TKIP */
-#define SEC_LEVEL_2_CKIP 3      /* Level 1 + CKIP */
-#define SEC_LEVEL_3      4      /* Level 2 + CCMP */
-
-#define WEP_KEYS 4
-#define WEP_KEY_LEN 13
+#define SEC_KEY_1               (1<<0)
+#define SEC_KEY_2               (1<<1)
+#define SEC_KEY_3               (1<<2)
+#define SEC_KEY_4               (1<<3)
+#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 */
+#define SEC_LEVEL_2             2       /* Level 1 + TKIP */
+#define SEC_LEVEL_2_CKIP        3       /* Level 1 + CKIP */
+#define SEC_LEVEL_3             4       /* Level 2 + CCMP */
+
+#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;
diff --git a/net/ieee80211/ieee80211_tx.c b/net/ieee80211/ieee80211_tx.c
index 435ef5a73d75..785e76f7e4e9 100644
--- a/net/ieee80211/ieee80211_tx.c
+++ b/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);
diff --git a/net/ieee80211/ieee80211_wx.c b/net/ieee80211/ieee80211_wx.c
index fc4e1377aba7..f88c8116a23c 100644
--- a/net/ieee80211/ieee80211_wx.c
+++ b/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 */
@@ -375,31 +378,34 @@ int ieee80211_wx_set_encode(struct ieee80211_device *ieee,
                                    key, escape_essid(sec.keys[key], len),
                                    erq->length, len);
                 sec.key_sizes[key] = len;
-                (*crypt)->ops->set_key(sec.keys[key], len, NULL,
-                                       (*crypt)->priv);
+                if (*crypt)
+                        (*crypt)->ops->set_key(sec.keys[key], len, NULL,
+                                               (*crypt)->priv);
                 sec.flags |= (1 << key);
                 /* This ensures a key will be activated if no key is
                  * explicitely set */
                 if (key == sec.active_key)
                         sec.flags |= SEC_ACTIVE_KEY;
+
         } else {
-                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);
-                        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);
+                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);
+                                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)