netdev - [net-next 0/1] tcp: support window clamp mid-stream

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Message-ID: <20210818212331.3780069-1-ntspring@fb.com>
Date:   Wed, 18 Aug 2021 14:23:30 -0700
From:   Neil Spring <ntspring@...com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>
CC:     <yoshfuji@...ux-ipv6.org>, <dsahern@...nel.org>, <kuba@...nel.org>,
        <netdev@...r.kernel.org>, <ncardwell@...gle.com>,
        <ycheng@...gle.com>, Neil Spring <ntspring@...com>
Subject: [net-next 0/1] tcp: support window clamp mid-stream

The TCP_WINDOW_CLAMP socket option is defined in tcp(7) to "Bound the size of
the advertised window to this value."  Window clamping is distributed across two
variables, window_clamp ("Maximal window to advertise" in tcp.h) and rcv_ssthresh
("Current window clamp").

This patch updates the function where the window clamp is set to also reduce the current
window clamp, rcv_sshthresh, if needed.  With this, setting the TCP_WINDOW_CLAMP option
has the documented effect of limiting the window.

Neil Spring (1):
  tcp: enable mid stream window clamp

 net/ipv4/tcp.c | 2 ++
 1 file changed, 2 insertions(+)

-- 
2.30.2