From d4b6cacbbb73ceef19c68c404b2d5eadf42d99c2 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Tue, 15 Oct 2013 22:16:29 +0200
Subject: Return allocated ifname on create

---
 fastd.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/fastd.c b/fastd.c
index 00dd41e..abdd17f 100644
--- a/fastd.c
+++ b/fastd.c
@@ -287,6 +287,8 @@ static int fastd_cmd_create(struct sk_buff *skb, struct genl_info *info)
 	u16 mtu = FASTD_DEFAULT_MTU;
 	const char *name = "fastd%d";
 	int err;
+	struct sk_buff *ret;
+	void *skb_head;
 
 	if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 		return -EPERM;
@@ -331,19 +333,41 @@ static int fastd_cmd_create(struct sk_buff *skb, struct genl_info *info)
 	fastd_netdev_init(dev);
 	dev->mtu = mtu;
 
+	ret = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!ret) {
+		err = -ENOMEM;
+		goto err_free_dev;
+	}
+
+	skb_head = genlmsg_put(ret, 0, info->snd_seq, &fastd_nl_family, 0, FASTD_CMD_CREATE);
+	if (!skb_head) {
+		err = -ENOMEM;
+		goto err_free_skb;
+	}
+
 	rtnl_lock();
 	err = register_netdevice(dev);
-	if (err < 0) {
+	if (err) {
 		rtnl_unlock();
 		goto err_free_dev;
 	}
 
 	list_add_rcu(&fastd->list, &fastd_list);
 
+	nla_put_string(ret, FASTD_A_IFNAME, dev->name);
+
 	rtnl_unlock();
 
+	genlmsg_end(ret, skb_head);
+	err = genlmsg_reply(ret, info);
+	if (err)
+		return err;
+
 	return 0;
 
+err_free_skb:
+	kfree_skb(ret);
+
 err_free_dev:
 	free_netdev(dev);
 
-- 
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