Account for endpoint header size when calculating Route MTU. #12373
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If r.mtu has been set, as it is after #11857, we skip calculating the proper MTU via endpoint.MTU and use r.mtu instead. However nothing in the callstack from tcpip/stack/stack.go:FindRoute to setting r.mtu actually adjusts the size to be able to hold the endpoint header. Hence we need to adjust it. PiperOrigin-RevId: 843416148
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Account for endpoint header size when calculating Route MTU.
If r.mtu has been set, as it is after
#11857, we skip calculating the proper MTU
via endpoint.MTU and use r.mtu instead. However nothing in the callstack from
tcpip/stack/stack.go:FindRoute to setting r.mtu actually adjusts the size to be
able to hold the endpoint header. Hence we need to adjust it.