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authorLawrence Brakmo <brakmo@fb.com>2017-06-30 20:02:53 -0700
committerDavid S. Miller <davem@davemloft.net>2017-07-01 16:15:14 -0700
commit13bf96411ad2bd162a4f9470d58c6bb579c96e21 (patch)
tree33d5d9ecfa19d4cc4752a888abf0b03ff42881c4 /net
parent7bc62e28547946ec6e47009730ee1385819e6999 (diff)
bpf: Adds support for setting sndcwnd clamp
Adds a new bpf_setsockopt for TCP sockets, TCP_BPF_SNDCWND_CLAMP, which sets the initial congestion window. It is useful to limit the sndcwnd when the host are close to each other (small RTT). Signed-off-by: Lawrence Brakmo <brakmo@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/filter.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index 794be0a454f5..523b91d25025 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2746,6 +2746,13 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
else
tp->snd_cwnd = val;
break;
+ case TCP_BPF_SNDCWND_CLAMP:
+ if (val <= 0) {
+ ret = -EINVAL;
+ } else {
+ tp->snd_cwnd_clamp = val;
+ tp->snd_ssthresh = val;
+ }
default:
ret = -EINVAL;
}