xfrm4: Don't call icmp_send on local error
Calling icmp_send() on a local message size error leads to an incorrect update of the path mtu. So use ip_local_error() instead to notify the socket about the error. Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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