bpf: Add BPF_SOCK_OPS_RETRANS_CB

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Adds support for calling sock_ops BPF program when there is a
retransmission. Three arguments are used; one for the sequence number,
another for the number of segments retransmitted, and the last one for
the return value of tcp_transmit_skb (0 => success).
Does not include syn-ack retransmissions.

New op: BPF_SOCK_OPS_RETRANS_CB.

Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Lawrence Brakmo 2018-01-25 16:14:14 -08:00 • committed by Alexei Starovoitov

parent 6f9bd3d731

commit a31ad29e6a

2 changed files with 12 additions and 1 deletions

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9

include/uapi/linux/bpf.h

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