[NETLINK]: Ignore control messages directly in netlink_run_queue()

Changes netlink_rcv_skb() to skip netlink controll messages and don't
pass them on to the message handler.
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/rtnetlink.c

@@ -864,10 +864,6 @@ rtnetlink_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
 
 	type = nlh->nlmsg_type;
 
-	/* A control message: ignore them */
-	if (type < RTM_BASE)
-		return 0;
-
 	/* Unknown message: reply with EINVAL */
 	if (type > RTM_MAX)
 		goto err_inval;

net/netlink/af_netlink.c

@@ -1479,6 +1479,10 @@ static int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
 		if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
 			goto skip;
 
+		/* Skip control messages */
+		if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
+			goto skip;
+
 		if (cb(skb, nlh, &err) < 0) {
 			/* Not an error, but we have to interrupt processing
 			 * here. Note: that in this case we do not pull

net/netlink/genetlink.c

@@ -304,9 +304,6 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	struct genlmsghdr *hdr = nlmsg_data(nlh);
 	int hdrlen, err = -EINVAL;
 
-	if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
-		goto ignore;
-
 	family = genl_family_find_byid(nlh->nlmsg_type);
 	if (family == NULL) {
 		err = -ENOENT;
@@ -364,9 +361,6 @@ static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
 	*errp = err = ops->doit(skb, &info);
 	return err;
 
-ignore:
-	return 0;
-
 errout:
 	*errp = err;
 	return -1;

net/xfrm/xfrm_user.c

@@ -1860,10 +1860,6 @@ static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *err
 
 	type = nlh->nlmsg_type;
 
-	/* A control message: ignore them */
-	if (type < XFRM_MSG_BASE)
-		return 0;
-
 	/* Unknown message: reply with EINVAL */
 	if (type > XFRM_MSG_MAX)
 		goto err_einval;