net/dst: add new function skb_dst_update_pmtu_no_confirm

BugLink: https://bugs.launchpad.net/bugs/1860602
[ 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 <gnault@redhat.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/include/net/dst.h b/include/net/dst.h
index 0e1169308e13bd9e6636c8f0e48615c08b19ab4d..95ff54df9238f13c8da4c94c98c4a5fabb74512e 100644 (file)
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -532,4 +532,13 @@ static inline void skb_dst_update_pmtu(struct sk_buff *skb, u32 mtu)
                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);
+}
+
 #endif /* _NET_DST_H */