Subject: [net 1/1] tcp: enable mid stream window clamp

From: Neil Spring <[email-masked]>
Date: Wed, 18 Aug 2021 14:23:31 -0700

Signed-off-by: Neil Spring <[email-masked]>
---
 net/ipv4/tcp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index f931def6302e..2dc6212d5888 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -3338,6 +3338,8 @@ int tcp_set_window_clamp(struct sock *sk, int val)
 	} else {
 		tp->window_clamp = val < SOCK_MIN_RCVBUF / 2 ?
 			SOCK_MIN_RCVBUF / 2 : val;
+		tp->rcv_ssthresh = min(tp->rcv_ssthresh,
+				       tp->window_clamp);
 	}
 	return 0;
 }
-- 
2.30.2