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>

1 files changed, 75 insertions, 75 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 0989c212b7c..ffd68d9a001 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -351,16 +351,16 @@ static u32 ieee80211_rx_load_stats(struct ieee80211_local *local,
 
 /* rx handlers */
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_if_stats(struct ieee80211_txrx_data *rx)
 {
 	if (rx->sta)
 		rx->sta->channel_use_raw += rx->u.rx.load;
 	rx->sdata->channel_use_raw += rx->u.rx.load;
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_local *local = rx->local;
@@ -372,21 +372,21 @@ ieee80211_rx_h_passive_scan(struct ieee80211_txrx_data *rx)
 	if (unlikely(local->sta_sw_scanning)) {
 		/* drop all the other packets during a software scan anyway */
 		if (ieee80211_sta_rx_scan(rx->dev, skb, rx->u.rx.status)
-		    != TXRX_QUEUED)
+		    != RX_QUEUED)
 			dev_kfree_skb(skb);
-		return TXRX_QUEUED;
+		return RX_QUEUED;
 	}
 
 	if (unlikely(rx->flags & IEEE80211_TXRXD_RXIN_SCAN)) {
 		/* scanning finished during invoking of handlers */
 		I802_DEBUG_INC(local->rx_handlers_drop_passive_scan);
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_hdr *hdr;
@@ -401,14 +401,14 @@ ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
 				rx->local->dot11FrameDuplicateCount++;
 				rx->sta->num_duplicates++;
 			}
-			return TXRX_DROP;
+			return RX_DROP;
 		} else
 			rx->sta->last_seq_ctrl[rx->u.rx.queue] = hdr->seq_ctrl;
 	}
 
 	if (unlikely(rx->skb->len < 16)) {
 		I802_DEBUG_INC(rx->local->rx_handlers_drop_short);
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
 	/* Drop disallowed frame classes based on STA auth/assoc state;
@@ -430,23 +430,23 @@ ieee80211_rx_h_check(struct ieee80211_txrx_data *rx)
 		    || !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)) {
 			/* Drop IBSS frames and frames for other hosts
 			 * silently. */
-			return TXRX_DROP;
+			return RX_DROP;
 		}
 
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 	int keyidx;
 	int hdrlen;
-	ieee80211_txrx_result result = TXRX_DROP;
+	ieee80211_rx_result result = RX_DROP;
 	struct ieee80211_key *stakey = NULL;
 
 	/*
@@ -476,14 +476,14 @@ ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
 	 */
 
 	if (!(rx->fc & IEEE80211_FCTL_PROTECTED))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	/*
 	 * No point in finding a key and decrypting if the frame is neither
 	 * addressed to us nor a multicast frame.
 	 */
 	if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if (rx->sta)
 		stakey = rcu_dereference(rx->sta->key);
@@ -502,12 +502,12 @@ ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
 		 */
 		if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
 		    (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
-			return TXRX_CONTINUE;
+			return RX_CONTINUE;
 
 		hdrlen = ieee80211_get_hdrlen(rx->fc);
 
 		if (rx->skb->len < 8 + hdrlen)
-			return TXRX_DROP; /* TODO: count this? */
+			return RX_DROP; /* TODO: count this? */
 
 		/*
 		 * no need to call ieee80211_wep_get_keyidx,
@@ -536,7 +536,7 @@ ieee80211_rx_h_decrypt(struct ieee80211_txrx_data *rx)
 			printk(KERN_DEBUG "%s: RX protected frame,"
 			       " but have no key\n", rx->dev->name);
 #endif /* CONFIG_MAC80211_DEBUG */
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
 	/* Check for weak IVs if possible */
@@ -629,7 +629,7 @@ static int ap_sta_ps_end(struct net_device *dev, struct sta_info *sta)
 	return sent;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 {
 	struct sta_info *sta = rx->sta;
@@ -637,7 +637,7 @@ ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
 
 	if (!sta)
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	/* Update last_rx only for IBSS packets which are for the current
 	 * BSSID to avoid keeping the current IBSS network alive in cases where
@@ -658,7 +658,7 @@ ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 	}
 
 	if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	sta->rx_fragments++;
 	sta->rx_bytes += rx->skb->len;
@@ -685,10 +685,10 @@ ieee80211_rx_h_sta_process(struct ieee80211_txrx_data *rx)
 		 * as a dropped packed. */
 		sta->rx_packets++;
 		dev_kfree_skb(rx->skb);
-		return TXRX_QUEUED;
+		return RX_QUEUED;
 	}
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 } /* ieee80211_rx_h_sta_process */
 
 static inline struct ieee80211_fragment_entry *
@@ -774,7 +774,7 @@ ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata,
 	return NULL;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_hdr *hdr;
@@ -811,7 +811,7 @@ ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 			       rx->key->u.ccmp.rx_pn[rx->u.rx.queue],
 			       CCMP_PN_LEN);
 		}
-		return TXRX_QUEUED;
+		return RX_QUEUED;
 	}
 
 	/* This is a fragment for a frame that should already be pending in
@@ -821,7 +821,7 @@ ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 					  rx->u.rx.queue, hdr);
 	if (!entry) {
 		I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
 	/* Verify that MPDUs within one MSDU have sequential PN values.
@@ -830,7 +830,7 @@ ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 		int i;
 		u8 pn[CCMP_PN_LEN], *rpn;
 		if (!rx->key || rx->key->conf.alg != ALG_CCMP)
-			return TXRX_DROP;
+			return RX_DROP;
 		memcpy(pn, entry->last_pn, CCMP_PN_LEN);
 		for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
 			pn[i]++;
@@ -848,7 +848,7 @@ ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 				       rpn[0], rpn[1], rpn[2], rpn[3], rpn[4],
 				       rpn[5], pn[0], pn[1], pn[2], pn[3],
 				       pn[4], pn[5]);
-			return TXRX_DROP;
+			return RX_DROP;
 		}
 		memcpy(entry->last_pn, pn, CCMP_PN_LEN);
 	}
@@ -859,7 +859,7 @@ ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 	entry->extra_len += rx->skb->len;
 	if (rx->fc & IEEE80211_FCTL_MOREFRAGS) {
 		rx->skb = NULL;
-		return TXRX_QUEUED;
+		return RX_QUEUED;
 	}
 
 	rx->skb = __skb_dequeue(&entry->skb_list);
@@ -869,7 +869,7 @@ ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 					      GFP_ATOMIC))) {
 			I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag);
 			__skb_queue_purge(&entry->skb_list);
-			return TXRX_DROP;
+			return RX_DROP;
 		}
 	}
 	while ((skb = __skb_dequeue(&entry->skb_list))) {
@@ -887,10 +887,10 @@ ieee80211_rx_h_defragment(struct ieee80211_txrx_data *rx)
 		rx->local->dot11MulticastReceivedFrameCount++;
 	else
 		ieee80211_led_rx(rx->local);
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
@@ -902,11 +902,11 @@ ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
 		   (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL ||
 		   (rx->fc & IEEE80211_FCTL_STYPE) != IEEE80211_STYPE_PSPOLL ||
 		   !(rx->flags & IEEE80211_TXRXD_RXRA_MATCH)))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if ((sdata->vif.type != IEEE80211_IF_TYPE_AP) &&
 	    (sdata->vif.type != IEEE80211_IF_TYPE_VLAN))
-		return TXRX_DROP;
+		return RX_DROP;
 
 	skb = skb_dequeue(&rx->sta->tx_filtered);
 	if (!skb) {
@@ -957,14 +957,14 @@ ieee80211_rx_h_ps_poll(struct ieee80211_txrx_data *rx)
 
 	}
 
-	/* Free PS Poll skb here instead of returning TXRX_DROP that would
+	/* Free PS Poll skb here instead of returning RX_DROP that would
 	 * count as an dropped frame. */
 	dev_kfree_skb(rx->skb);
 
-	return TXRX_QUEUED;
+	return RX_QUEUED;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
 {
 	u16 fc = rx->fc;
@@ -972,7 +972,7 @@ ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) data;
 
 	if (!WLAN_FC_IS_QOS_DATA(fc))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	/* remove the qos control field, update frame type and meta-data */
 	memmove(data + 2, data, ieee80211_get_hdrlen(fc) - 2);
@@ -981,7 +981,7 @@ ieee80211_rx_h_remove_qos_control(struct ieee80211_txrx_data *rx)
 	rx->fc = fc &= ~IEEE80211_STYPE_QOS_DATA;
 	hdr->frame_control = cpu_to_le16(fc);
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
 static int
@@ -1238,7 +1238,7 @@ ieee80211_deliver_skb(struct ieee80211_txrx_data *rx)
 	}
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
 {
 	struct net_device *dev = rx->dev;
@@ -1254,17 +1254,17 @@ ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
 
 	fc = rx->fc;
 	if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
-		return TXRX_DROP;
+		return RX_DROP;
 
 	if (!(rx->flags & IEEE80211_TXRXD_RX_AMSDU))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	err = ieee80211_data_to_8023(rx);
 	if (unlikely(err))
-		return TXRX_DROP;
+		return RX_DROP;
 
 	skb->dev = dev;
 
@@ -1274,7 +1274,7 @@ ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
 	/* skip the wrapping header */
 	eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 	if (!eth)
-		return TXRX_DROP;
+		return RX_DROP;
 
 	while (skb != frame) {
 		u8 padding;
@@ -1289,7 +1289,7 @@ ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
 		/* the last MSDU has no padding */
 		if (subframe_len > remaining) {
 			printk(KERN_DEBUG "%s: wrong buffer size", dev->name);
-			return TXRX_DROP;
+			return RX_DROP;
 		}
 
 		skb_pull(skb, sizeof(struct ethhdr));
@@ -1301,7 +1301,7 @@ ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
 					      subframe_len);
 
 			if (frame == NULL)
-				return TXRX_DROP;
+				return RX_DROP;
 
 			skb_reserve(frame, local->hw.extra_tx_headroom +
 				    sizeof(struct ethhdr));
@@ -1314,7 +1314,7 @@ ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
 				printk(KERN_DEBUG "%s: wrong buffer size ",
 				       dev->name);
 				dev_kfree_skb(frame);
-				return TXRX_DROP;
+				return RX_DROP;
 			}
 		}
 
@@ -1344,7 +1344,7 @@ ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
 
 		if (!ieee80211_frame_allowed(rx)) {
 			if (skb == frame) /* last frame */
-				return TXRX_DROP;
+				return RX_DROP;
 			dev_kfree_skb(frame);
 			continue;
 		}
@@ -1352,10 +1352,10 @@ ieee80211_rx_h_amsdu(struct ieee80211_txrx_data *rx)
 		ieee80211_deliver_skb(rx);
 	}
 
-	return TXRX_QUEUED;
+	return RX_QUEUED;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
 {
 	struct net_device *dev = rx->dev;
@@ -1364,17 +1364,17 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
 
 	fc = rx->fc;
 	if (unlikely((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if (unlikely(!WLAN_FC_DATA_PRESENT(fc)))
-		return TXRX_DROP;
+		return RX_DROP;
 
 	err = ieee80211_data_to_8023(rx);
 	if (unlikely(err))
-		return TXRX_DROP;
+		return RX_DROP;
 
 	if (!ieee80211_frame_allowed(rx))
-		return TXRX_DROP;
+		return RX_DROP;
 
 	rx->skb->dev = dev;
 
@@ -1383,10 +1383,10 @@ ieee80211_rx_h_data(struct ieee80211_txrx_data *rx)
 
 	ieee80211_deliver_skb(rx);
 
-	return TXRX_QUEUED;
+	return RX_QUEUED;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_local *local = rx->local;
@@ -1398,15 +1398,15 @@ ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx)
 	u16 tid;
 
 	if (likely((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_CTL))
-		return TXRX_CONTINUE;
+		return RX_CONTINUE;
 
 	if ((rx->fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_BACK_REQ) {
 		if (!rx->sta)
-			return TXRX_CONTINUE;
+			return RX_CONTINUE;
 		tid = le16_to_cpu(bar->control) >> 12;
 		tid_agg_rx = &(rx->sta->ampdu_mlme.tid_rx[tid]);
 		if (tid_agg_rx->state != HT_AGG_STATE_OPERATIONAL)
-			return TXRX_CONTINUE;
+			return RX_CONTINUE;
 
 		start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4;
 
@@ -1423,19 +1423,19 @@ ieee80211_rx_h_ctrl(struct ieee80211_txrx_data *rx)
 		ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL,
 						 start_seq_num, 1);
 		rcu_read_unlock();
-		return TXRX_DROP;
+		return RX_DROP;
 	}
 
-	return TXRX_CONTINUE;
+	return RX_CONTINUE;
 }
 
-static ieee80211_txrx_result
+static ieee80211_rx_result
 ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
 {
 	struct ieee80211_sub_if_data *sdata;
 
 	if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
-		return TXRX_DROP;
+		return RX_DROP;
 
 	sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev);
 	if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
@@ -1443,39 +1443,39 @@ ieee80211_rx_h_mgmt(struct ieee80211_txrx_data *rx)
 	    !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 		ieee80211_sta_rx_mgmt(rx->dev, rx->skb, rx->u.rx.status);
 	else
-		return TXRX_DROP;
+		return RX_DROP;
 
-	return TXRX_QUEUED;
+	return RX_QUEUED;
 }
 
-static inline ieee80211_txrx_result __ieee80211_invoke_rx_handlers(
+static inline ieee80211_rx_result __ieee80211_invoke_rx_handlers(
 				struct ieee80211_local *local,
 				ieee80211_rx_handler *handlers,
 				struct ieee80211_txrx_data *rx,
 				struct sta_info *sta)
 {
 	ieee80211_rx_handler *handler;
-	ieee80211_txrx_result res = TXRX_DROP;
+	ieee80211_rx_result res = RX_DROP;
 
 	for (handler = handlers; *handler != NULL; handler++) {
 		res = (*handler)(rx);
 
 		switch (res) {
-		case TXRX_CONTINUE:
+		case RX_CONTINUE:
 			continue;
-		case TXRX_DROP:
+		case RX_DROP:
 			I802_DEBUG_INC(local->rx_handlers_drop);
 			if (sta)
 				sta->rx_dropped++;
 			break;
-		case TXRX_QUEUED:
+		case RX_QUEUED:
 			I802_DEBUG_INC(local->rx_handlers_queued);
 			break;
 		}
 		break;
 	}
 
-	if (res == TXRX_DROP)
+	if (res == RX_DROP)
 		dev_kfree_skb(rx->skb);
 	return res;
 }
@@ -1486,7 +1486,7 @@ static inline void ieee80211_invoke_rx_handlers(struct ieee80211_local *local,
 						struct sta_info *sta)
 {
 	if (__ieee80211_invoke_rx_handlers(local, handlers, rx, sta) ==
-	    TXRX_CONTINUE)
+	    RX_CONTINUE)
 		dev_kfree_skb(rx->skb);
 }