[PATCH] mac80211: separate monitor/subif_start_xmit

This patch separates the monitor interface start_xmit from the
subif start xmit (those other devices have 802.3 framing, monitor
interfaces have radiotap framing)
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJiri Benc <jbenc@suse.cz>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>

net/mac80211/ieee80211.c

@@ -1673,44 +1673,11 @@ static int ieee80211_master_start_xmit(struct sk_buff *skb,
 }
 
 
-/**
- * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
- * subinterfaces (wlan#, WDS, and VLAN interfaces)
- * @skb: packet to be sent
- * @dev: incoming interface
- *
- * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
- * not be freed, and caller is responsible for either retrying later or freeing
- * skb).
- *
- * This function takes in an Ethernet header and encapsulates it with suitable
- * IEEE 802.11 header based on which interface the packet is coming in. The
- * encapsulated packet will then be passed to master interface, wlan#.11, for
- * transmission (through low-level driver).
- */
-static int ieee80211_subif_start_xmit(struct sk_buff *skb,
+int ieee80211_monitor_start_xmit(struct sk_buff *skb,
 				 struct net_device *dev)
 {
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	struct ieee80211_tx_packet_data *pkt_data;
-	struct ieee80211_sub_if_data *sdata;
-	int ret = 1, head_need;
-	u16 ethertype, hdrlen, fc;
-	struct ieee80211_hdr hdr;
-	const u8 *encaps_data;
-	int encaps_len, skip_header_bytes;
-	int nh_pos, h_pos, no_encrypt = 0;
-	struct sta_info *sta;
-
-	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
-	if (unlikely(skb->len < ETH_HLEN)) {
-		printk(KERN_DEBUG "%s: short skb (len=%d)\n",
-		       dev->name, skb->len);
-		ret = 0;
-		goto fail;
-	}
-
-	if (unlikely(sdata->type == IEEE80211_IF_TYPE_MNTR)) {
 	struct ieee80211_radiotap_header *prthdr =
 		(struct ieee80211_radiotap_header *)skb->data;
 	u16 len;
@@ -1721,15 +1688,15 @@ static int ieee80211_subif_start_xmit(struct sk_buff *skb,
 	 */
 	if (unlikely(prthdr->it_version)) {
 		/* only version 0 is supported */
-			ret = 0;
-			goto fail;
+		dev_kfree_skb(skb);
+		return NETDEV_TX_OK;
 	}
 
 	skb->dev = local->mdev;
 
 	pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 	memset(pkt_data, 0, sizeof(*pkt_data));
-		pkt_data->ifindex = sdata->dev->ifindex;
+	pkt_data->ifindex = dev->ifindex;
 	pkt_data->mgmt_iface = 0;
 	pkt_data->do_not_encrypt = 1;
 
@@ -1743,8 +1710,8 @@ static int ieee80211_subif_start_xmit(struct sk_buff *skb,
 	 */
 	len = le16_to_cpu(get_unaligned(&prthdr->it_len));
 	skb_set_mac_header(skb, len);
-		skb_set_network_header(skb, len + sizeof(hdr));
-		skb_set_transport_header(skb, len + sizeof(hdr));
+	skb_set_network_header(skb, len + sizeof(struct ieee80211_hdr));
+	skb_set_transport_header(skb, len + sizeof(struct ieee80211_hdr));
 
 	/*
 	 * pass the radiotap header up to
@@ -1752,7 +1719,45 @@ static int ieee80211_subif_start_xmit(struct sk_buff *skb,
 	 */
 	dev_queue_xmit(skb);
 
-		return 0;
+	return NETDEV_TX_OK;
+}
+
+
+/**
+ * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type
+ * subinterfaces (wlan#, WDS, and VLAN interfaces)
+ * @skb: packet to be sent
+ * @dev: incoming interface
+ *
+ * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will
+ * not be freed, and caller is responsible for either retrying later or freeing
+ * skb).
+ *
+ * This function takes in an Ethernet header and encapsulates it with suitable
+ * IEEE 802.11 header based on which interface the packet is coming in. The
+ * encapsulated packet will then be passed to master interface, wlan#.11, for
+ * transmission (through low-level driver).
+ */
+int ieee80211_subif_start_xmit(struct sk_buff *skb,
+			       struct net_device *dev)
+{
+	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+	struct ieee80211_tx_packet_data *pkt_data;
+	struct ieee80211_sub_if_data *sdata;
+	int ret = 1, head_need;
+	u16 ethertype, hdrlen, fc;
+	struct ieee80211_hdr hdr;
+	const u8 *encaps_data;
+	int encaps_len, skip_header_bytes;
+	int nh_pos, h_pos, no_encrypt = 0;
+	struct sta_info *sta;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	if (unlikely(skb->len < ETH_HLEN)) {
+		printk(KERN_DEBUG "%s: short skb (len=%d)\n",
+		       dev->name, skb->len);
+		ret = 0;
+		goto fail;
 	}
 
 	nh_pos = skb_network_header(skb) - skb->data;
@@ -1882,7 +1887,7 @@ static int ieee80211_subif_start_xmit(struct sk_buff *skb,
 
 	pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 	memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
-	pkt_data->ifindex = sdata->dev->ifindex;
+	pkt_data->ifindex = dev->ifindex;
 	pkt_data->mgmt_iface = (sdata->type == IEEE80211_IF_TYPE_MGMT);
 	pkt_data->do_not_encrypt = no_encrypt;
 

net/mac80211/ieee80211_i.h

@@ -720,6 +720,8 @@ void ieee80211_prepare_rates(struct ieee80211_local *local,
 			     struct ieee80211_hw_mode *mode);
 void ieee80211_tx_set_iswep(struct ieee80211_txrx_data *tx);
 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr);
+int ieee80211_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev);
+int ieee80211_subif_start_xmit(struct sk_buff *skb, struct net_device *dev);
 void ieee80211_if_setup(struct net_device *dev);
 void ieee80211_if_mgmt_setup(struct net_device *dev);
 int ieee80211_init_rate_ctrl_alg(struct ieee80211_local *local,

net/mac80211/ieee80211_iface.c

@@ -157,6 +157,8 @@ void ieee80211_if_set_type(struct net_device *dev, int type)
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	int oldtype = sdata->type;
 
+	dev->hard_start_xmit = ieee80211_subif_start_xmit;
+
 	sdata->type = type;
 	switch (type) {
 	case IEEE80211_IF_TYPE_WDS:
@@ -196,6 +198,7 @@ void ieee80211_if_set_type(struct net_device *dev, int type)
 	}
 	case IEEE80211_IF_TYPE_MNTR:
 		dev->type = ARPHRD_IEEE80211_RADIOTAP;
+		dev->hard_start_xmit = ieee80211_monitor_start_xmit;
 		break;
 	default:
 		printk(KERN_WARNING "%s: %s: Unknown interface type 0x%x",