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| author | Yuchung Cheng <ycheng@google.com> | 2019-01-08 18:12:24 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-27 10:08:04 +0100 |
| commit | b1bf951df56775f4401ece4101470936b47c27c1 (patch) | |
| tree | 38c6828f165a4abddbc887ffd998df350932b7c0 | |
| parent | d6e33e07b8311764414969f5ddde93e052d226ea (diff) | |
| download | linux-stable-b1bf951df56775f4401ece4101470936b47c27c1.tar.gz linux-stable-b1bf951df56775f4401ece4101470936b47c27c1.tar.bz2 linux-stable-b1bf951df56775f4401ece4101470936b47c27c1.zip | |
bpf: correctly set initial window on active Fast Open sender
[ Upstream commit 31aa6503a15ba00182ea6dbbf51afb63bf9e851d ]
The existing BPF TCP initial congestion window (TCP_BPF_IW) does not
to work on (active) Fast Open sender. This is because it changes the
(initial) window only if data_segs_out is zero -- but data_segs_out
is also incremented on SYN-data. This patch fixes the issue by
proerly accounting for SYN-data additionally.
Fixes: fc7478103c84 ("bpf: Adds support for setting initial cwnd")
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Lawrence Brakmo <brakmo@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/core/filter.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 542fd04bc44d..a8a9ff0568b9 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -3128,7 +3128,7 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, /* Only some options are supported */ switch (optname) { case TCP_BPF_IW: - if (val <= 0 || tp->data_segs_out > 0) + if (val <= 0 || tp->data_segs_out > tp->syn_data) ret = -EINVAL; else tp->snd_cwnd = val; |