ipv6: send only one NEWLINK when RA causes changes

Signed-off-by: NMarius Tomaschewski <mt@suse.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv6/ndisc.c

@@ -1079,6 +1079,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 	int optlen;
 	unsigned int pref = 0;
 	__u32 old_if_flags;
+	bool send_ifinfo_notify = false;
 
 	__u8 *opt = (__u8 *)(ra_msg + 1);
 
@@ -1158,7 +1159,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 					IF_RA_OTHERCONF : 0);
 
 	if (old_if_flags != in6_dev->if_flags)
-		inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
+		send_ifinfo_notify = true;
 
 	if (!in6_dev->cnf.accept_ra_defrtr) {
 		ND_PRINTK(2, info,
@@ -1261,7 +1262,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 				rtime = HZ/10;
 			NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime);
 			in6_dev->tstamp = jiffies;
-			inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
+			send_ifinfo_notify = true;
 		}
 
 		rtime = ntohl(ra_msg->reachable_time);
@@ -1278,11 +1279,17 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 					      GC_STALETIME, 3 * rtime);
 				in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
 				in6_dev->tstamp = jiffies;
-				inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
+				send_ifinfo_notify = true;
 			}
 		}
 	}
 
+	/*
+	 *	Send a notify if RA changed managed/otherconf flags or timer settings
+	 */
+	if (send_ifinfo_notify)
+		inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
+
 skip_linkparms:
 
 	/*