[PATCH] ieee80211: Added handle_deauth() callback, enhanced tkip/ccmp…

… support of varying hw/sw offload

tree de81b55e78e85997642c651ea677078d0554a14f
parent c8030da8c159f8b82712172a6748a42523aea83a
author James Ketrenos <jketreno@linux.intel.com> 1127104380 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127315225 -0500

Added handle_deauth() callback.
Enhanced crypt_{tkip,ccmp} to support varying splits of HW/SW offload.
Changed channel freq to u32 from u16.
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

include/net/ieee80211.h

@@ -808,7 +808,7 @@ enum {
 };
 
 struct ieee80211_channel {
-	u16 freq;
+	u32 freq;
 	u8 channel;
 	u8 flags;
 	u8 max_power;
@@ -862,6 +862,7 @@ struct ieee80211_device {
 	int host_mc_decrypt;
 
 	int host_open_frag;
+	int host_build_iv;
 	int ieee802_1x;		/* is IEEE 802.1X used */
 
 	/* WPA data */
@@ -914,6 +915,8 @@ struct ieee80211_device {
 	/* Typical STA methods */
 	int (*handle_auth) (struct net_device * dev,
 			    struct ieee80211_auth * auth);
+	int (*handle_deauth) (struct net_device * dev,
+			      struct ieee80211_auth * auth);
 	int (*handle_disassoc) (struct net_device * dev,
 				struct ieee80211_disassoc * assoc);
 	int (*handle_beacon) (struct net_device * dev,

include/net/ieee80211_crypt.h

@@ -36,6 +36,8 @@ struct ieee80211_crypto_ops {
 	/* deinitialize crypto context and free allocated private data */
 	void (*deinit) (void *priv);
 
+	int (*build_iv) (struct sk_buff * skb, int hdr_len, void *priv);
+
 	/* encrypt/decrypt return < 0 on error or >= 0 on success. The return
 	 * value from decrypt_mpdu is passed as the keyidx value for
 	 * decrypt_msdu. skb must have enough head and tail room for the

net/ieee80211/ieee80211_crypt_ccmp.c

@@ -191,26 +191,18 @@ static void ccmp_init_blocks(struct crypto_tfm *tfm,
 	ieee80211_ccmp_aes_encrypt(tfm, b0, s0);
 }
 
-static int ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+static int ieee80211_ccmp_hdr(struct sk_buff *skb, int hdr_len, void *priv)
 {
 	struct ieee80211_ccmp_data *key = priv;
-	int data_len, i, blocks, last, len;
-	u8 *pos, *mic;
-	struct ieee80211_hdr_4addr *hdr;
-	u8 *b0 = key->tx_b0;
-	u8 *b = key->tx_b;
-	u8 *e = key->tx_e;
-	u8 *s0 = key->tx_s0;
+	int i;
+	u8 *pos;
 
-	if (skb_headroom(skb) < CCMP_HDR_LEN ||
-	    skb_tailroom(skb) < CCMP_MIC_LEN || skb->len < hdr_len)
+	if (skb_headroom(skb) < CCMP_HDR_LEN || skb->len < hdr_len)
 		return -1;
 
-	data_len = skb->len - hdr_len;
 	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) {
@@ -229,6 +221,30 @@ static int ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
 	*pos++ = key->tx_pn[1];
 	*pos++ = key->tx_pn[0];
 
+	return CCMP_HDR_LEN;
+}
+
+static int ieee80211_ccmp_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+	struct ieee80211_ccmp_data *key = priv;
+	int data_len, i, blocks, last, len;
+	u8 *pos, *mic;
+	struct ieee80211_hdr_4addr *hdr;
+	u8 *b0 = key->tx_b0;
+	u8 *b = key->tx_b;
+	u8 *e = key->tx_e;
+	u8 *s0 = key->tx_s0;
+
+	if (skb_tailroom(skb) < CCMP_MIC_LEN || skb->len < hdr_len)
+		return -1;
+
+	data_len = skb->len - hdr_len;
+	len = ieee80211_ccmp_hdr(skb, hdr_len, priv);
+	if (len < 0)
+		return -1;
+
+	pos = skb->data + hdr_len + CCMP_HDR_LEN;
+	mic = skb_put(skb, CCMP_MIC_LEN);
 	hdr = (struct ieee80211_hdr_4addr *)skb->data;
 	ccmp_init_blocks(key->tfm, hdr, key->tx_pn, data_len, b0, b, s0);
 
@@ -429,6 +445,7 @@ static struct ieee80211_crypto_ops ieee80211_crypt_ccmp = {
 	.name = "CCMP",
 	.init = ieee80211_ccmp_init,
 	.deinit = ieee80211_ccmp_deinit,
+	.build_iv = ieee80211_ccmp_hdr,
 	.encrypt_mpdu = ieee80211_ccmp_encrypt,
 	.decrypt_mpdu = ieee80211_ccmp_decrypt,
 	.encrypt_msdu = NULL,

net/ieee80211/ieee80211_crypt_tkip.c

@@ -260,35 +260,27 @@ static void tkip_mixing_phase2(u8 * WEPSeed, const u8 * TK, const u16 * TTAK,
 #endif
 }
 
-static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+static u8 *ieee80211_tkip_hdr(struct sk_buff *skb, int hdr_len, void *priv)
 {
 	struct ieee80211_tkip_data *tkey = priv;
 	int len;
-	u8 rc4key[16], *pos, *icv;
+	u8 *rc4key, *pos, *icv;
 	struct ieee80211_hdr_4addr *hdr;
 	u32 crc;
-	struct scatterlist sg;
 
 	hdr = (struct ieee80211_hdr_4addr *)skb->data;
 
-	if (tkey->ieee->tkip_countermeasures) {
-		if (net_ratelimit()) {
-			printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
-			       "TX packet to " MAC_FMT "\n",
-			       tkey->ieee->dev->name, MAC_ARG(hdr->addr1));
-		}
-		return -1;
-	}
-
-	if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 ||
-	    skb->len < hdr_len)
-		return -1;
+	if (skb_headroom(skb) < 8 || skb->len < hdr_len)
+		return NULL;
 
 	if (!tkey->tx_phase1_done) {
 		tkip_mixing_phase1(tkey->tx_ttak, tkey->key, hdr->addr2,
 				   tkey->tx_iv32);
 		tkey->tx_phase1_done = 1;
 	}
+	rc4key = kmalloc(16, GFP_ATOMIC);
+	if (!rc4key)
+		return NULL;
 	tkip_mixing_phase2(rc4key, tkey->key, tkey->tx_ttak, tkey->tx_iv16);
 
 	len = skb->len - hdr_len;
@@ -297,9 +289,9 @@ static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
 	pos += hdr_len;
 	icv = skb_put(skb, 4);
 
-	*pos++ = rc4key[0];
-	*pos++ = rc4key[1];
-	*pos++ = rc4key[2];
+	*pos++ = *rc4key;
+	*pos++ = *(rc4key + 1);
+	*pos++ = *(rc4key + 2);
 	*pos++ = (tkey->key_idx << 6) | (1 << 5) /* Ext IV included */ ;
 	*pos++ = tkey->tx_iv32 & 0xff;
 	*pos++ = (tkey->tx_iv32 >> 8) & 0xff;
@@ -312,6 +304,38 @@ static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
 	icv[2] = crc >> 16;
 	icv[3] = crc >> 24;
 
+	return rc4key;
+}
+
+static int ieee80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+	struct ieee80211_tkip_data *tkey = priv;
+	int len;
+	const u8 *rc4key;
+	u8 *pos;
+	struct scatterlist sg;
+
+	if (tkey->ieee->tkip_countermeasures) {
+		if (net_ratelimit()) {
+			struct ieee80211_hdr_4addr *hdr =
+			    (struct ieee80211_hdr_4addr *)skb->data;
+			printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
+			       "TX packet to " MAC_FMT "\n",
+			       tkey->ieee->dev->name, MAC_ARG(hdr->addr1));
+		}
+		return -1;
+	}
+
+	if (skb_tailroom(skb) < 4 || skb->len < hdr_len)
+		return -1;
+
+	len = skb->len - hdr_len;
+	pos = skb->data + hdr_len;
+
+	rc4key = ieee80211_tkip_hdr(skb, hdr_len, priv);
+	if (!rc4key)
+		return -1;
+
 	crypto_cipher_setkey(tkey->tfm_arc4, rc4key, 16);
 	sg.page = virt_to_page(pos);
 	sg.offset = offset_in_page(pos);

net/ieee80211/ieee80211_rx.c

@@ -1534,6 +1534,12 @@ void ieee80211_rx_mgt(struct ieee80211_device *ieee,
 					      header);
 		break;
 
+	case IEEE80211_STYPE_DEAUTH:
+		printk("DEAUTH from AP\n");
+		if (ieee->handle_deauth != NULL)
+			ieee->handle_deauth(ieee->dev, (struct ieee80211_auth *)
+					    header);
+		break;
 	default:
 		IEEE80211_DEBUG_MGMT("received UNKNOWN (%d)\n",
 				     WLAN_FC_GET_STYPE(le16_to_cpu

net/ieee80211/ieee80211_tx.c

@@ -227,7 +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, host_encrypt_msdu;
+	int ether_type, encrypt, host_encrypt, host_encrypt_msdu, host_build_iv;
 	int bytes, fc, hdr_len;
 	struct sk_buff *skb_frag;
 	struct ieee80211_hdr_3addr header = {	/* Ensure zero initialized */
@@ -263,8 +263,10 @@ 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;
+	host_build_iv = ieee->host_build_iv && encrypt;
 
 	if (!encrypt && ieee->ieee802_1x &&
 	    ieee->drop_unencrypted && ether_type != ETH_P_PAE) {
@@ -310,8 +312,10 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 		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;
@@ -418,7 +422,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 	for (; i < nr_frags; i++) {
 		skb_frag = txb->fragments[i];
 
-		if (host_encrypt)
+		if (host_encrypt || host_build_iv)
 			skb_reserve(skb_frag,
 				    crypt->ops->extra_mpdu_prefix_len);
 
@@ -453,6 +457,16 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev)
 		 * to insert the IV between the header and the payload */
 		if (host_encrypt)
 			ieee80211_encrypt_fragment(ieee, skb_frag, hdr_len);
+		else if (host_build_iv) {
+			struct ieee80211_crypt_data *crypt;
+
+			crypt = ieee->crypt[ieee->tx_keyidx];
+			atomic_inc(&crypt->refcnt);
+			if (crypt->ops->build_iv)
+				crypt->ops->build_iv(skb_frag, hdr_len,
+						     crypt->priv);
+			atomic_dec(&crypt->refcnt);
+		}
 
 		if (ieee->config &
 		    (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS))