Copy route MTU from net namespace and adjust for network header size #12373
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In the original version of this commit #11857, If r.mtu has been set we skip calculating the proper MTU in tcpip/stack/route.go:Route.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. Fixes #11856 PiperOrigin-RevId: 843416148
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Copy route MTU from net namespace and adjust for network header size
In the original version of this commit
#11857, If r.mtu has been set we skip
calculating the proper MTU in tcpip/stack/route.go:Route.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.
Fixes #11856