diff mbox series

[bpf-next,1/2] bpf: Adds support for setting window clamp

Message ID 20201201000339.3310760-2-prankgup@fb.com
State New
Headers show
Series Add support to set window_clamp from bpf setsockops | expand

Commit Message

Prankur gupta Dec. 1, 2020, 12:03 a.m. UTC 
Adds a new bpf_setsockopt for TCP sockets, TCP_BPF_WINDOW_CLAMP,
which sets the maximum receiver window size. It will be useful for
limiting receiver window based on RTT.

Signed-off-by: Prankur gupta <prankgup@fb.com>
---
 net/core/filter.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/net/core/filter.c b/net/core/filter.c
index 2ca5eecebacf..cb006962b677 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4910,6 +4910,14 @@  static int _bpf_setsockopt(struct sock *sk, int level, int optname,
 				tp->notsent_lowat = val;
 				sk->sk_write_space(sk);
 				break;
+			case TCP_WINDOW_CLAMP:
+				if (val <= 0)
+					ret = -EINVAL;
+				else
+					tp->window_clamp =
+						max_t(int, val,
+						      SOCK_MIN_RCVBUF / 2);
+				break;
 			default:
 				ret = -EINVAL;
 			}