[GENL]: Add genlmsg_put_reply() to simplify building reply headers

By modyfing genlmsg_put() to take a genl_family and by adding
genlmsg_put_reply() the process of constructing the netlink
and generic netlink headers is simplified.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index 7846937..e8c80f3 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -188,12 +188,9 @@
 	struct netlbl_domhsh_walk_arg *cb_arg = arg;
 	void *data;
 
-	data = netlbl_netlink_hdr_put(cb_arg->skb,
-				      NETLINK_CB(cb_arg->nl_cb->skb).pid,
-				      cb_arg->seq,
-				      netlbl_mgmt_gnl_family.id,
-				      NLM_F_MULTI,
-				      NLBL_MGMT_C_LISTALL);
+	data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid,
+			   cb_arg->seq, &netlbl_mgmt_gnl_family,
+			   NLM_F_MULTI, NLBL_MGMT_C_LISTALL);
 	if (data == NULL)
 		goto listall_cb_failure;
 
@@ -359,12 +356,8 @@
 	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (ans_skb == NULL)
 		return -ENOMEM;
-	data = netlbl_netlink_hdr_put(ans_skb,
-				      info->snd_pid,
-				      info->snd_seq,
-				      netlbl_mgmt_gnl_family.id,
-				      0,
-				      NLBL_MGMT_C_LISTDEF);
+	data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
+				 0, NLBL_MGMT_C_LISTDEF);
 	if (data == NULL)
 		goto listdef_failure;
 
@@ -422,12 +415,9 @@
 	int ret_val = -ENOMEM;
 	void *data;
 
-	data = netlbl_netlink_hdr_put(skb,
-				      NETLINK_CB(cb->skb).pid,
-				      cb->nlh->nlmsg_seq,
-				      netlbl_mgmt_gnl_family.id,
-				      NLM_F_MULTI,
-				      NLBL_MGMT_C_PROTOCOLS);
+	data = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
+			   &netlbl_mgmt_gnl_family, NLM_F_MULTI,
+			   NLBL_MGMT_C_PROTOCOLS);
 	if (data == NULL)
 		goto protocols_cb_failure;
 
@@ -495,12 +485,8 @@
 	ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (ans_skb == NULL)
 		return -ENOMEM;
-	data = netlbl_netlink_hdr_put(ans_skb,
-				      info->snd_pid,
-				      info->snd_seq,
-				      netlbl_mgmt_gnl_family.id,
-				      0,
-				      NLBL_MGMT_C_VERSION);
+	data = genlmsg_put_reply(ans_skb, info, &netlbl_mgmt_gnl_family,
+				 0, NLBL_MGMT_C_VERSION);
 	if (data == NULL)
 		goto version_failure;