mac80211: split ieee80211_txrx_result

The _DROP result will need to be split in the RX path but not
in the TX path, so for preparation split up the type into two
types, one for RX and one for TX. Also make sure (via sparse)
that they cannot be confused.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/ieee80211_i.h

@@ -108,9 +108,16 @@ struct ieee80211_sta_bss {
 };
 
 
-typedef enum {
-	TXRX_CONTINUE, TXRX_DROP, TXRX_QUEUED
-} ieee80211_txrx_result;
+typedef unsigned __bitwise__ ieee80211_tx_result;
+#define TX_CONTINUE	((__force ieee80211_tx_result) 0u)
+#define TX_DROP		((__force ieee80211_tx_result) 1u)
+#define TX_QUEUED	((__force ieee80211_tx_result) 2u)
+
+typedef unsigned __bitwise__ ieee80211_rx_result;
+#define RX_CONTINUE	((__force ieee80211_rx_result) 0u)
+#define RX_DROP		((__force ieee80211_rx_result) 1u)
+#define RX_QUEUED	((__force ieee80211_rx_result) 2u)
+
 
 /* flags used in struct ieee80211_txrx_data.flags */
 /* whether the MSDU was fragmented */
@@ -182,10 +189,10 @@ struct ieee80211_tx_stored_packet {
 	unsigned int last_frag_rate_ctrl_probe;
 };
 
-typedef ieee80211_txrx_result (*ieee80211_tx_handler)
+typedef ieee80211_tx_result (*ieee80211_tx_handler)
 (struct ieee80211_txrx_data *tx);
 
-typedef ieee80211_txrx_result (*ieee80211_rx_handler)
+typedef ieee80211_rx_result (*ieee80211_rx_handler)
 (struct ieee80211_txrx_data *rx);
 
 struct beacon_data {
@@ -729,8 +736,8 @@ int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len);
 void ieee80211_sta_req_auth(struct net_device *dev,
 			    struct ieee80211_if_sta *ifsta);
 int ieee80211_sta_scan_results(struct net_device *dev, char *buf, size_t len);
-ieee80211_txrx_result ieee80211_sta_rx_scan(struct net_device *dev,
-					    struct sk_buff *skb,
+ieee80211_rx_result ieee80211_sta_rx_scan(
+	struct net_device *dev, struct sk_buff *skb,
 	struct ieee80211_rx_status *rx_status);
 void ieee80211_rx_bss_list_init(struct net_device *dev);
 void ieee80211_rx_bss_list_deinit(struct net_device *dev);

net/mac80211/ieee80211_sta.c

@@ -2559,7 +2559,7 @@ static void ieee80211_sta_rx_queued_mgmt(struct net_device *dev,
 }
 
 
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
 		      struct ieee80211_rx_status *rx_status)
 {
@@ -2567,31 +2567,31 @@ ieee80211_sta_rx_scan(struct net_device *dev, struct sk_buff *skb,
 	u16 fc;
 
 	if (skb->len < 2)
-		return TXRX_DROP;
+		return RX_DROP;
 
 	mgmt = (struct ieee80211_mgmt *) skb->data;
 	fc = le16_to_cpu(mgmt->frame_control);
 
 	if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL)
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if (skb->len < 24)
-		return TXRX_DROP;
+		return RX_DROP;
 
 	if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
 		if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP) {
 			ieee80211_rx_mgmt_probe_resp(dev, mgmt,
 						     skb->len, rx_status);
 			dev_kfree_skb(skb);
-			return TXRX_QUEUED;
+			return RX_QUEUED;
 		} else if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BEACON) {
 			ieee80211_rx_mgmt_beacon(dev, mgmt, skb->len,
 						 rx_status);
 			dev_kfree_skb(skb);
-			return TXRX_QUEUED;
+			return RX_QUEUED;
 		}
 	}
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
 

net/mac80211/wep.c

@@ -305,13 +305,13 @@ u8 * ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key)
 	return NULL;
 }
 
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_crypto_wep_decrypt(struct ieee80211_txrx_data *rx)
 {
 	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA &&
 	    ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_MGMT ||
 	     (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_AUTH))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
 		if (ieee80211_wep_decrypt(rx->local, rx->skb, rx->key)) {
@@ -320,7 +320,7 @@ ieee80211_crypto_wep_decrypt(struct ieee80211_txrx_data *rx)
 				printk(KERN_DEBUG "%s: RX WEP frame, decrypt "
 				       "failed\n", rx->dev->name);
 #endif /* CONFIG_MAC80211_DEBUG */
-			return TXRX_DROP;
+			return RX_DROP;
 		}
 	} else if (!(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED)) {
 		ieee80211_wep_remove_iv(rx->local, rx->skb, rx->key);
@@ -328,7 +328,7 @@ ieee80211_crypto_wep_decrypt(struct ieee80211_txrx_data *rx)
 		skb_trim(rx->skb, rx->skb->len - 4);
 	}
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
 static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
@@ -346,7 +346,7 @@ static int wep_encrypt_skb(struct ieee80211_txrx_data *tx, struct sk_buff *skb)
 	return 0;
 }
 
-ieee80211_txrx_result
+ieee80211_tx_result
 ieee80211_crypto_wep_encrypt(struct ieee80211_txrx_data *tx)
 {
 	tx->u.tx.control->iv_len = WEP_IV_LEN;
@@ -355,7 +355,7 @@ ieee80211_crypto_wep_encrypt(struct ieee80211_txrx_data *tx)
 
 	if (wep_encrypt_skb(tx, tx->skb) < 0) {
 		I802_DEBUG_INC(tx->local->tx_handlers_drop_wep);
-		return TXRX_DROP;
+		return TX_DROP;
 	}
 
 	if (tx->u.tx.extra_frag) {
@@ -364,10 +364,10 @@ ieee80211_crypto_wep_encrypt(struct ieee80211_txrx_data *tx)
 			if (wep_encrypt_skb(tx, tx->u.tx.extra_frag[i]) < 0) {
 				I802_DEBUG_INC(tx->local->
 					       tx_handlers_drop_wep);
-				return TXRX_DROP;
+				return TX_DROP;
 			}
 		}
 	}
 
-	return TXRX_CONTINUE;
+	return TX_CONTINUE;
 }

net/mac80211/wep.h

@@ -28,9 +28,9 @@ int ieee80211_wep_decrypt(struct ieee80211_local *local, struct sk_buff *skb,
 			  struct ieee80211_key *key);
 u8 * ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key);
 
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_crypto_wep_decrypt(struct ieee80211_txrx_data *rx);
-ieee80211_txrx_result
+ieee80211_tx_result
 ieee80211_crypto_wep_encrypt(struct ieee80211_txrx_data *tx);
 
 #endif /* WEP_H */

net/mac80211/wpa.c

@@ -70,7 +70,7 @@ static int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da,
 }
 
 
-ieee80211_txrx_result
+ieee80211_tx_result
 ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
 {
 	u8 *data, *sa, *da, *key, *mic, qos_tid;
@@ -84,10 +84,10 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
 
 	if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 ||
 	    !WLAN_FC_DATA_PRESENT(fc))
-		return TXRX_CONTINUE;
+		return TX_CONTINUE;
 
 	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
-		return TXRX_DROP;
+		return TX_DROP;
 
 	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
 	    !(tx->flags & IEEE80211_TXRXD_FRAGMENTED) &&
@@ -95,7 +95,7 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
 	    !wpa_test) {
 		/* hwaccel - with no need for preallocated room for Michael MIC
 		 */
-		return TXRX_CONTINUE;
+		return TX_CONTINUE;
 	}
 
 	if (skb_tailroom(skb) < MICHAEL_MIC_LEN) {
@@ -105,7 +105,7 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
 					      GFP_ATOMIC))) {
 			printk(KERN_DEBUG "%s: failed to allocate more memory "
 			       "for Michael MIC\n", tx->dev->name);
-			return TXRX_DROP;
+			return TX_DROP;
 		}
 	}
 
@@ -119,11 +119,11 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
 	mic = skb_put(skb, MICHAEL_MIC_LEN);
 	michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
 
-	return TXRX_CONTINUE;
+	return TX_CONTINUE;
 }
 
 
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
 {
 	u8 *data, *sa, *da, *key = NULL, qos_tid;
@@ -140,15 +140,15 @@ ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
 	 * No way to verify the MIC if the hardware stripped it
 	 */
 	if (rx->u.rx.status->flag & RX_FLAG_MMIC_STRIPPED)
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
 	    !(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
 	    || data_len < MICHAEL_MIC_LEN)
-		return TXRX_DROP;
+		return RX_DROP;
 
 	data_len -= MICHAEL_MIC_LEN;
 
@@ -162,14 +162,14 @@ ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
 	michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
 	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
 		if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
-			return TXRX_DROP;
+			return RX_DROP;
 
 		printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
 		       "%s\n", rx->dev->name, print_mac(mac, sa));
 
 		mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
 						(void *) skb->data);
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
 	/* remove Michael MIC from payload */
@@ -179,7 +179,7 @@ ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
 	rx->key->u.tkip.iv32_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv32;
 	rx->key->u.tkip.iv16_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv16;
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
 
@@ -242,7 +242,7 @@ static int tkip_encrypt_skb(struct ieee80211_txrx_data *tx,
 }
 
 
-ieee80211_txrx_result
+ieee80211_tx_result
 ieee80211_crypto_tkip_encrypt(struct ieee80211_txrx_data *tx)
 {
 	struct sk_buff *skb = tx->skb;
@@ -257,26 +257,26 @@ ieee80211_crypto_tkip_encrypt(struct ieee80211_txrx_data *tx)
 	    !wpa_test) {
 		/* hwaccel - with no need for preallocated room for IV/ICV */
 		tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
-		return TXRX_CONTINUE;
+		return TX_CONTINUE;
 	}
 
 	if (tkip_encrypt_skb(tx, skb, test) < 0)
-		return TXRX_DROP;
+		return TX_DROP;
 
 	if (tx->u.tx.extra_frag) {
 		int i;
 		for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
 			if (tkip_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
 			    < 0)
-				return TXRX_DROP;
+				return TX_DROP;
 		}
 	}
 
-	return TXRX_CONTINUE;
+	return TX_CONTINUE;
 }
 
 
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
@@ -290,10 +290,10 @@ ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx)
 	hdrlen = ieee80211_get_hdrlen(fc);
 
 	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if (!rx->sta || skb->len - hdrlen < 12)
-		return TXRX_DROP;
+		return RX_DROP;
 
 	if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) {
 		if (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) {
@@ -302,7 +302,7 @@ ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx)
 			 * replay protection, and stripped the ICV/IV so
 			 * we cannot do any checks here.
 			 */
-			return TXRX_CONTINUE;
+			return RX_CONTINUE;
 		}
 
 		/* let TKIP code verify IV, but skip decryption */
@@ -322,7 +322,7 @@ ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx)
 			       "frame from %s (res=%d)\n", rx->dev->name,
 			       print_mac(mac, rx->sta->addr), res);
 #endif /* CONFIG_MAC80211_DEBUG */
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
 	/* Trim ICV */
@@ -332,7 +332,7 @@ ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx)
 	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
 	skb_pull(skb, TKIP_IV_LEN);
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
 
@@ -491,7 +491,7 @@ static int ccmp_encrypt_skb(struct ieee80211_txrx_data *tx,
 }
 
 
-ieee80211_txrx_result
+ieee80211_tx_result
 ieee80211_crypto_ccmp_encrypt(struct ieee80211_txrx_data *tx)
 {
 	struct sk_buff *skb = tx->skb;
@@ -506,26 +506,26 @@ ieee80211_crypto_ccmp_encrypt(struct ieee80211_txrx_data *tx)
 		/* hwaccel - with no need for preallocated room for CCMP "
 		 * header or MIC fields */
 		tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
-		return TXRX_CONTINUE;
+		return TX_CONTINUE;
 	}
 
 	if (ccmp_encrypt_skb(tx, skb, test) < 0)
-		return TXRX_DROP;
+		return TX_DROP;
 
 	if (tx->u.tx.extra_frag) {
 		int i;
 		for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
 			if (ccmp_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
 			    < 0)
-				return TXRX_DROP;
+				return TX_DROP;
 		}
 	}
 
-	return TXRX_CONTINUE;
+	return TX_CONTINUE;
 }
 
 
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
@@ -541,15 +541,15 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx)
 	hdrlen = ieee80211_get_hdrlen(fc);
 
 	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
 	if (!rx->sta || data_len < 0)
-		return TXRX_DROP;
+		return RX_DROP;
 
 	if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
 	    (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	(void) ccmp_hdr2pn(pn, skb->data + hdrlen);
 
@@ -565,7 +565,7 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx)
 		       ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]);
 #endif /* CONFIG_MAC80211_DEBUG */
 		key->u.ccmp.replays++;
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
 	if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
@@ -589,7 +589,7 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx)
 				       "for RX frame from %s\n", rx->dev->name,
 				       print_mac(mac, rx->sta->addr));
 #endif /* CONFIG_MAC80211_DEBUG */
-			return TXRX_DROP;
+			return RX_DROP;
 		}
 	}
 
@@ -600,5 +600,5 @@ ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx)
 	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
 	skb_pull(skb, CCMP_HDR_LEN);
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }

net/mac80211/wpa.h

@@ -13,19 +13,19 @@
 #include <linux/types.h>
 #include "ieee80211_i.h"
 
-ieee80211_txrx_result
+ieee80211_tx_result
 ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx);
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx);
 
-ieee80211_txrx_result
+ieee80211_tx_result
 ieee80211_crypto_tkip_encrypt(struct ieee80211_txrx_data *tx);
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx);
 
-ieee80211_txrx_result
+ieee80211_tx_result
 ieee80211_crypto_ccmp_encrypt(struct ieee80211_txrx_data *tx);
-ieee80211_txrx_result
+ieee80211_rx_result
 ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx);
 
 #endif /* WPA_H */