From 0dec879f636f11b0ffda1cb5fd96a1754c59ead3 Mon Sep 17 00:00:00 2001 From: Julian Anastasov Date: Mon, 6 Feb 2017 23:14:16 +0200 Subject: net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP When same struct dst_entry can be used for many different neighbours we can not use it for pending confirmations. The datagram protocols can use MSG_CONFIRM to confirm the neighbour. When used with MSG_PROBE we do not reach the code where neighbour is confirmed, so we have to do the same slow lookup by using the dst_confirm_neigh() helper. When MSG_PROBE is not used, ip_append_data/ip6_append_data will set the skb flag dst_pending_confirm. Reported-by: YueHaibing Fixes: 5110effee8fd ("net: Do delayed neigh confirmation.") Fixes: f2bb4bedf35d ("ipv4: Cache output routes in fib_info nexthops.") Signed-off-by: Julian Anastasov Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/l2tp/l2tp_ip6.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'net/l2tp/l2tp_ip6.c') diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c index 4b06eb415f68..734798a00ca0 100644 --- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -658,7 +658,8 @@ out: return err < 0 ? err : len; do_confirm: - dst_confirm(dst); + if (msg->msg_flags & MSG_PROBE) + dst_confirm_neigh(dst, &fl6.daddr); if (!(msg->msg_flags & MSG_PROBE) || len) goto back_from_confirm; err = 0; -- cgit v1.2.3