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bpf: Add sock_ops RTO callback

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Adds an optional call to sock_ops BPF program based on whether the
BPF_SOCK_OPS_RTO_CB_FLAG is set in bpf_sock_ops_flags.
The BPF program is passed 2 arguments: icsk_retransmits and whether the
RTO has expired.

Signed-off-by: Lawrence Brakmo <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
This commit is contained in:
Lawrence Brakmo 2018-01-25 16:14:11 -08:00 • committed by Alexei Starovoitov
commit f89013f66d
2 changed files with 14 additions and 1 deletions
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7
net/ipv4/tcp_timer.c
View file

@ -213,11 +213,18 @@ static int tcp_write_timeout(struct sock *sk)
icsk->icsk_user_timeout);
}
tcp_fastopen_active_detect_blackhole(sk, expired);
if (BPF_SOCK_OPS_TEST_FLAG(tp, BPF_SOCK_OPS_RTO_CB_FLAG))
tcp_call_bpf_3arg(sk, BPF_SOCK_OPS_RTO_CB,
icsk->icsk_retransmits,
icsk->icsk_rto, (int)expired);
if (expired) {
/* Has it gone just too far? */
tcp_write_err(sk);
return 1;
}
return 0;
}