From 806c37ddcf286665adce5c3a99b5fe4424cbf9fe Mon Sep 17 00:00:00 2001 From: Kalash Nainwal Date: Thu, 10 Feb 2022 14:09:35 -0800 Subject: Generate netlink notification when default IPv6 route preference changes Generate RTM_NEWROUTE netlink notification when the route preference changes on an existing kernel generated default route in response to RA messages. Currently netlink notifications are generated only when this route is added or deleted but not when the route preference changes, which can cause userspace routing application state to go out of sync with kernel. Signed-off-by: Kalash Nainwal Reviewed-by: David Ahern Signed-off-by: David S. Miller --- net/ipv6/ndisc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'net/ipv6/ndisc.c') diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index f03b597e4121..1c06d0cd02f7 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1337,8 +1337,12 @@ static void ndisc_router_discovery(struct sk_buff *skb) return; } neigh->flags |= NTF_ROUTER; - } else if (rt) { + } else if (rt && IPV6_EXTRACT_PREF(rt->fib6_flags) != pref) { + struct nl_info nlinfo = { + .nl_net = net, + }; rt->fib6_flags = (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); + inet6_rt_notify(RTM_NEWROUTE, rt, &nlinfo, NLM_F_REPLACE); } if (rt) -- cgit v1.2.3