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Subject[PATCH 5.4 170/191] net/dst: add new function skb_dst_update_pmtu_no_confirm
From: Hangbin Liu <>

[ Upstream commit 07dc35c6e3cc3c001915d05f5bf21f80a39a0970 ]

Add a new function skb_dst_update_pmtu_no_confirm() for callers who need
update pmtu but should not do neighbor confirm.

v5: No change.
v4: No change.
v3: Do not remove dst_confirm_neigh, but add a new bool parameter in
dst_ops.update_pmtu to control whether we should do neighbor confirm.
Also split the big patch to small ones for each area.
v2: Remove dst_confirm_neigh in __ip6_rt_update_pmtu.

Reviewed-by: Guillaume Nault <>
Acked-by: David Ahern <>
Signed-off-by: Hangbin Liu <>
Signed-off-by: David S. Miller <>
Signed-off-by: Greg Kroah-Hartman <>
include/net/dst.h | 9 +++++++++
1 file changed, 9 insertions(+)

--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -519,6 +519,15 @@ static inline void skb_dst_update_pmtu(s
dst->ops->update_pmtu(dst, NULL, skb, mtu, true);

+/* update dst pmtu but not do neighbor confirm */
+static inline void skb_dst_update_pmtu_no_confirm(struct sk_buff *skb, u32 mtu)
+ struct dst_entry *dst = skb_dst(skb);
+ if (dst && dst->ops->update_pmtu)
+ dst->ops->update_pmtu(dst, NULL, skb, mtu, false);
static inline void skb_tunnel_check_pmtu(struct sk_buff *skb,
struct dst_entry *encap_dst,
int headroom)

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