bpf: Add support for changing congestion control
Added support for changing congestion control for SOCK_OPS bpf programs through the setsockopt bpf helper function. It also adds a new SOCK_OPS op, BPF_SOCK_OPS_NEEDS_ECN, that is needed for congestion controls, like dctcp, that need to enable ECN in the SYN packets. Signed-off-by: NLawrence Brakmo <brakmo@fb.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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