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authorYuchung Cheng <ycheng@google.com>2019-01-08 18:12:24 -0800
committerAlexei Starovoitov <ast@kernel.org>2019-01-09 15:17:46 -0800
commit31aa6503a15ba00182ea6dbbf51afb63bf9e851d (patch)
treec178cabac27fe84159c2385fa85a2e282b048832 /net
parentd972f3dce8d161e2142da0ab1ef25df00e2f21a9 (diff)
downloadlinux-31aa6503a15ba00182ea6dbbf51afb63bf9e851d.tar.bz2
bpf: correctly set initial window on active Fast Open sender
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>
Diffstat (limited to 'net')
-rw-r--r--net/core/filter.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index 447dd1bad31f..2b3b436ef545 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4203,7 +4203,7 @@ 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;