can: gw: Properly fill the netlink header when responding to RTM_GETROUTE

 - set message type to RTM_NEWROUTE
 - relate to original request by inheriting the sequence and port number.
 - set NLM_F_MULTI because it's a dump and more messages will follow

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

net/can/gw.c

@@ -444,11 +444,14 @@ static int cgw_notifier(struct notifier_block *nb,
 	return NOTIFY_DONE;
 }
 
-static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj)
+static int cgw_put_job(struct sk_buff *skb, struct cgw_job *gwj, int type,
+		       u32 pid, u32 seq, int flags)
 {
 	struct cgw_frame_mod mb;
 	struct rtcanmsg *rtcan;
-	struct nlmsghdr *nlh = nlmsg_put(skb, 0, 0, 0, sizeof(*rtcan), 0);
+	struct nlmsghdr *nlh;
+
+	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtcan), flags);
 	if (!nlh)
 		return -EMSGSIZE;
 
@@ -546,7 +549,8 @@ static int cgw_dump_jobs(struct sk_buff *skb, struct netlink_callback *cb)
 		if (idx < s_idx)
 			goto cont;
 
-		if (cgw_put_job(skb, gwj) < 0)
+		if (cgw_put_job(skb, gwj, RTM_NEWROUTE, NETLINK_CB(cb->skb).pid,
+		    cb->nlh->nlmsg_seq, NLM_F_MULTI) < 0)
 			break;
 cont:
 		idx++;