1 files changed, 83 insertions, 65 deletions

diff --git a/net/ieee80211/ieee80211_tx.c b/net/ieee80211/ieee80211_tx.c
index f505aa127e21..23a1f88de7cb 100644
--- a/net/ieee80211/ieee80211_tx.c
+++ b/net/ieee80211/ieee80211_tx.c
@@ -128,7 +128,7 @@ payload of each frame is reduced to 492 bytes.
 static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 };
 static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 };
 
-static inline int ieee80211_put_snap(u8 * data, u16 h_proto)
+static inline int ieee80211_copy_snap(u8 * data, u16 h_proto)
 {
         struct ieee80211_snap_hdr *snap;
         u8 *oui;
@@ -159,15 +159,9 @@ static inline int ieee80211_encrypt_fragment(struct ieee80211_device *ieee,
 
         /* To encrypt, frame format is:
          * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) */
-
-        // PR: FIXME: Copied from hostap. Check fragmentation/MSDU/MPDU encryption.
-        /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
-         * call both MSDU and MPDU encryption functions from here. */
         atomic_inc(&crypt->refcnt);
         res = 0;
-        if (crypt->ops->encrypt_msdu)
-                res = crypt->ops->encrypt_msdu(frag, hdr_len, crypt->priv);
-        if (res == 0 && crypt->ops->encrypt_mpdu)
+        if (crypt->ops->encrypt_mpdu)
                 res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv);
 
         atomic_dec(&crypt->refcnt);
@@ -222,7 +216,7 @@ static struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size,
         return txb;
 }
 
-/* Incoming skb is converted to a txb which consist of
+/* Incoming skb is converted to a txb which consists of
  * a block of 802.11 fragment packets (stored as skbs) */
 int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 {
@@ -233,7 +227,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
             rts_required;
         unsigned long flags;
         struct net_device_stats *stats = &ieee->stats;
-        int ether_type, encrypt, host_encrypt;
+        int ether_type, encrypt, host_encrypt, host_encrypt_msdu;
         int bytes, fc, hdr_len;
         struct sk_buff *skb_frag;
         struct ieee80211_hdr_3addr header = {   /* Ensure zero initialized */
@@ -241,8 +235,8 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
                 .seq_ctl = 0
         };
         u8 dest[ETH_ALEN], src[ETH_ALEN];
-
         struct ieee80211_crypt_data *crypt;
+        int snapped = 0;
 
         spin_lock_irqsave(&ieee->lock, flags);
 
@@ -266,6 +260,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
         encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) &&
             ieee->sec.encrypt;
         host_encrypt = ieee->host_encrypt && encrypt;
+        host_encrypt_msdu = ieee->host_encrypt_msdu && encrypt;
 
         if (!encrypt && ieee->ieee802_1x &&
             ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
@@ -291,14 +286,12 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 
         if (ieee->iw_mode == IW_MODE_INFRA) {
                 fc |= IEEE80211_FCTL_TODS;
-                /* To DS: Addr1 = BSSID, Addr2 = SA,
-                   Addr3 = DA */
+                /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
                 memcpy(header.addr1, ieee->bssid, ETH_ALEN);
                 memcpy(header.addr2, src, ETH_ALEN);
                 memcpy(header.addr3, dest, ETH_ALEN);
         } else if (ieee->iw_mode == IW_MODE_ADHOC) {
-                /* not From/To DS: Addr1 = DA, Addr2 = SA,
-                   Addr3 = BSSID */
+                /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
                 memcpy(header.addr1, dest, ETH_ALEN);
                 memcpy(header.addr2, src, ETH_ALEN);
                 memcpy(header.addr3, ieee->bssid, ETH_ALEN);
@@ -306,42 +299,75 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
         header.frame_ctl = cpu_to_le16(fc);
         hdr_len = IEEE80211_3ADDR_LEN;
 
-        /* Determine fragmentation size based on destination (multicast
-         * and broadcast are not fragmented) */
-        if (is_multicast_ether_addr(dest) || is_broadcast_ether_addr(dest))
-                frag_size = MAX_FRAG_THRESHOLD;
-        else
-                frag_size = ieee->fts;
+        /* Encrypt msdu first on the whole data packet. */
+        if ((host_encrypt || host_encrypt_msdu) &&
+            crypt && crypt->ops && crypt->ops->encrypt_msdu) {
+                int res = 0;
+                int len = bytes + hdr_len + crypt->ops->extra_msdu_prefix_len +
+                    crypt->ops->extra_msdu_postfix_len;
+                struct sk_buff *skb_new = dev_alloc_skb(len);
+                if (unlikely(!skb_new))
+                        goto failed;
+                skb_reserve(skb_new, crypt->ops->extra_msdu_prefix_len);
+                memcpy(skb_put(skb_new, hdr_len), &header, hdr_len);
+                snapped = 1;
+                ieee80211_copy_snap(skb_put(skb_new, SNAP_SIZE + sizeof(u16)),
+                                    ether_type);
+                memcpy(skb_put(skb_new, skb->len), skb->data, skb->len);
+                res = crypt->ops->encrypt_msdu(skb_new, hdr_len, crypt->priv);
+                if (res < 0) {
+                        IEEE80211_ERROR("msdu encryption failed\n");
+                        dev_kfree_skb_any(skb_new);
+                        goto failed;
+                }
+                dev_kfree_skb_any(skb);
+                skb = skb_new;
+                bytes += crypt->ops->extra_msdu_prefix_len +
+                    crypt->ops->extra_msdu_postfix_len;
+                skb_pull(skb, hdr_len);
+        }
 
-        /* Determine amount of payload per fragment.  Regardless of if
-         * this stack is providing the full 802.11 header, one will
-         * eventually be affixed to this fragment -- so we must account for
-         * it when determining the amount of payload space. */
-        bytes_per_frag = frag_size - IEEE80211_3ADDR_LEN;
-        if (ieee->config &
-            (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
-                bytes_per_frag -= IEEE80211_FCS_LEN;
+        if (host_encrypt || ieee->host_open_frag) {
+                /* Determine fragmentation size based on destination (multicast
+                 * and broadcast are not fragmented) */
+                if (is_multicast_ether_addr(dest))
+                        frag_size = MAX_FRAG_THRESHOLD;
+                else
+                        frag_size = ieee->fts;
+
+                /* Determine amount of payload per fragment.  Regardless of if
+                 * this stack is providing the full 802.11 header, one will
+                 * eventually be affixed to this fragment -- so we must account
+                 * for it when determining the amount of payload space. */
+                bytes_per_frag = frag_size - IEEE80211_3ADDR_LEN;
+                if (ieee->config &
+                    (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))
+                        bytes_per_frag -= IEEE80211_FCS_LEN;
 
-        /* Each fragment may need to have room for encryptiong pre/postfix */
-        if (host_encrypt)
-                bytes_per_frag -= crypt->ops->extra_prefix_len +
-                    crypt->ops->extra_postfix_len;
-
-        /* Number of fragments is the total bytes_per_frag /
-         * payload_per_fragment */
-        nr_frags = bytes / bytes_per_frag;
-        bytes_last_frag = bytes % bytes_per_frag;
-        if (bytes_last_frag)
-                nr_frags++;
-        else
-                bytes_last_frag = bytes_per_frag;
+                /* Each fragment may need to have room for encryptiong
+                 * pre/postfix */
+                if (host_encrypt)
+                        bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len +
+                            crypt->ops->extra_mpdu_postfix_len;
+
+                /* Number of fragments is the total
+                 * bytes_per_frag / payload_per_fragment */
+                nr_frags = bytes / bytes_per_frag;
+                bytes_last_frag = bytes % bytes_per_frag;
+                if (bytes_last_frag)
+                        nr_frags++;
+                else
+                        bytes_last_frag = bytes_per_frag;
+        } else {
+                nr_frags = 1;
+                bytes_per_frag = bytes_last_frag = bytes;
+                frag_size = bytes + IEEE80211_3ADDR_LEN;
+        }
 
         rts_required = (frag_size > ieee->rts
                         && ieee->config & CFG_IEEE80211_RTS);
         if (rts_required)
                 nr_frags++;
-        else
-                bytes_last_frag = bytes_per_frag;
 
         /* When we allocate the TXB we allocate enough space for the reserve
          * and full fragment bytes (bytes_per_frag doesn't include prefix,
@@ -353,7 +379,11 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
                 goto failed;
         }
         txb->encrypted = encrypt;
-        txb->payload_size = bytes;
+        if (host_encrypt)
+                txb->payload_size = frag_size * (nr_frags - 1) +
+                    bytes_last_frag;
+        else
+                txb->payload_size = bytes;
 
         if (rts_required) {
                 skb_frag = txb->fragments[0];
@@ -385,7 +415,8 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
                 skb_frag = txb->fragments[i];
 
                 if (host_encrypt)
-                        skb_reserve(skb_frag, crypt->ops->extra_prefix_len);
+                        skb_reserve(skb_frag,
+                                    crypt->ops->extra_mpdu_prefix_len);
 
                 frag_hdr =
                     (struct ieee80211_hdr_3addr *)skb_put(skb_frag, hdr_len);
@@ -402,11 +433,10 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
                         bytes = bytes_last_frag;
                 }
 
-                /* Put a SNAP header on the first fragment */
-                if (i == 0) {
-                        ieee80211_put_snap(skb_put
-                                           (skb_frag, SNAP_SIZE + sizeof(u16)),
-                                           ether_type);
+                if (i == 0 && !snapped) {
+                        ieee80211_copy_snap(skb_put
+                                            (skb_frag, SNAP_SIZE + sizeof(u16)),
+                                            ether_type);
                         bytes -= SNAP_SIZE + sizeof(u16);
                 }
 
@@ -420,19 +450,6 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
                 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);
@@ -444,7 +461,8 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
         dev_kfree_skb_any(skb);
 
         if (txb) {
-                if ((*ieee->hard_start_xmit) (txb, dev) == 0) {
+                int ret = (*ieee->hard_start_xmit) (txb, dev);
+                if (ret == 0) {
                         stats->tx_packets++;
                         stats->tx_bytes += txb->payload_size;
                         return 0;