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tcp: enable mid stream window clamp

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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.

Signed-off-by: Neil Spring <ntspring@fb.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20210825210117.1668371-1-ntspring@fb.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Neil Spring 2021-08-25 14:01:17 -07:00 committed by Jakub Kicinski
parent 97c78d0af5
commit 3aa7857fe1
1 changed files with 1 additions and 0 deletions
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net/ipv4/tcp.c
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@ -3338,6 +3338,7 @@ 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_wnd, tp->window_clamp);
}
return 0;
}