From 888629be2dd5a0b7d2d6707efc8315c96dfb8867 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Thu, 14 Apr 2011 03:07:33 +0200
Subject: Make receiving work

---
 quicktun.c | 37 +++++++++++++++++++++++++++++++++++--
 1 file changed, 35 insertions(+), 2 deletions(-)

diff --git a/quicktun.c b/quicktun.c
index 9d1f722..e745eb1 100644
--- a/quicktun.c
+++ b/quicktun.c
@@ -1,7 +1,9 @@
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
 #include <linux/if_arp.h>
+#include <linux/ip.h>
 #include <linux/netdevice.h>
+#include <linux/udp.h>
 #include <net/genetlink.h>
 #include <net/sock.h>
 
@@ -12,8 +14,6 @@
 #define DRV_VERSION	"0.1"
 #define DRV_DESCRIPTION	"Quicktun tunnel driver"
 
-#define QUICKTUN_READQ_SIZE	500
-
 #define QUICKTUN_TYPE_MASK		0x000f
 #define QUICKTUN_FLAG_REMOTE_FLOAT	0x0010
 
@@ -55,9 +55,32 @@ static netdev_tx_t quicktun_net_xmit(struct sk_buff *skb, struct net_device *dev
 		kernel_sendmsg(tun->sock, &msg, &vec, 1, skb->len);
 	}
 
+	consume_skb(skb);
+
 	return NETDEV_TX_OK;
 }
 
+static void quicktun_udp_data_ready(struct sock *sk, int bytes)
+{
+	int err;
+	struct sk_buff *skb;
+	struct quicktun_struct *tun = sk->sk_user_data;
+
+	skb = skb_recv_datagram(sk, 0, 1, &err);
+	if (!skb) {
+		if (err == -EAGAIN)
+			return;
+		pr_info("Quicktun: UDP socket error %d", err);
+		return;
+	}
+
+	skb_orphan(skb);
+
+	skb_pull(skb, sizeof(struct udphdr));
+	skb->protocol = eth_type_trans(skb, tun->dev);
+	netif_rx_ni(skb);
+}
+
 static int
 quicktun_net_change_mtu(struct net_device *dev, int new_mtu)
 {
@@ -168,6 +191,9 @@ static int quicktun_socket_init(struct net_device *dev)
 	if (err < 0)
 		return err;
 
+	tun->sock->sk->sk_data_ready = quicktun_udp_data_ready;
+	tun->sock->sk->sk_user_data = tun;
+
 	err = kernel_bind(tun->sock, (struct sockaddr*)&tun->local_address, sizeof(tun->local_address));
 	if (err < 0)
 		goto error;
@@ -243,6 +269,8 @@ static int quicktun_cmd_create_device(struct sk_buff *skb, struct genl_info *inf
 	if (err < 0)
 		goto err_free_dev;
 
+	rtnl_lock();
+
 	if (strchr(dev->name, '%')) {
 		err = dev_alloc_name(dev, dev->name);
 		if (err < 0)
@@ -253,9 +281,14 @@ static int quicktun_cmd_create_device(struct sk_buff *skb, struct genl_info *inf
 	if (err < 0)
 		goto err_free_sk;
 
+	rtnl_unlock();
+
 	return 0;
 
  err_free_sk:
+	rtnl_unlock();
+	sock_release(tun->sock);
+
  err_free_dev:
 	free_netdev(dev);
 	return err;
-- 
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