From 0ad97454e708a7f0ca0db36c2b90d1ae6c74ae30 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 15 Apr 2011 04:13:32 +0200
Subject: Update packet, byte and drop stats.

---
 quicktun.c | 41 +++++++++++++++++++++++++++++++++--------
 1 file changed, 33 insertions(+), 8 deletions(-)

diff --git a/quicktun.c b/quicktun.c
index 3ecc0cc..6899a05 100644
--- a/quicktun.c
+++ b/quicktun.c
@@ -43,7 +43,7 @@ static netdev_tx_t quicktun_net_xmit(struct sk_buff *skb, struct net_device *dev
 	if (tun->remote_address.sin_addr.s_addr) {
 		err = skb_linearize(skb);
 		if (err < 0)
-			goto err;
+			goto drop;
 
 		vec.iov_base = skb->data;
 		vec.iov_len = skb->len;
@@ -55,24 +55,31 @@ static netdev_tx_t quicktun_net_xmit(struct sk_buff *skb, struct net_device *dev
 		msg.msg_flags = MSG_DONTWAIT;
 
 		kernel_sendmsg(tun->sock, &msg, &vec, 1, skb->len);
+
+		tun->dev->stats.tx_packets++;
+		tun->dev->stats.tx_bytes += skb->len;
 	}
+	else
+		goto drop;
 
 	consume_skb(skb);
 
 	return NETDEV_TX_OK;
 
- err:
+ drop:
 	kfree_skb(skb);
 
+	tun->dev->stats.tx_dropped++;
 	return NETDEV_TX_OK;
 }
 
 static void quicktun_udp_data_ready(struct sock *sk, int bytes)
 {
-	int err;
 	struct sk_buff *skb;
+	unsigned int len;
 	struct quicktun_struct *tun = sk->sk_user_data;
-	struct iphdr *iphdr;
+	int err;
+
 
 	skb = skb_recv_datagram(sk, 0, 1, &err);
 	if (!skb) {
@@ -86,27 +93,45 @@ static void quicktun_udp_data_ready(struct sock *sk, int bytes)
 
 	err = skb_linearize(skb);
 	if (err < 0)
-		goto err;
+		goto drop;
 
 	__skb_pull(skb, sizeof(struct udphdr));
 
+	len = skb->len;
+
 	switch (tun->flags & QUICKTUN_MODE_MASK) {
 	case QUICKTUN_MODE_ETHERNET:
 		skb->protocol = eth_type_trans(skb, tun->dev);
 		break;
+
 	case QUICKTUN_MODE_IP:
 		__skb_tunnel_rx(skb, tun->dev);
 		skb_reset_network_header(skb);
 
-		iphdr = (struct iphdr*)skb->data;
-		skb->protocol = htons((iphdr->version == 6) ? ETH_P_IPV6 : ETH_P_IP);
+		switch (skb->data[0] & 0xf0) {
+		case 0x40:
+			skb->protocol = htons(ETH_P_IP);
+			break;
+		case 0x60:
+			skb->protocol = htons(ETH_P_IPV6);
+			break;
+		default:
+			goto drop;
+		}
 		break;
+
+	default:
+		goto drop;
 	}
 
 	netif_rx_ni(skb);
+
+	tun->dev->stats.rx_packets++;
+	tun->dev->stats.rx_bytes += len;
 	return;
 
- err:
+ drop:
+	tun->dev->stats.rx_dropped++;
 	kfree_skb(skb);
 }
 
-- 
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