Messages in this thread | | | From | Eric Dumazet <> | Date | Tue, 10 Nov 2020 08:32:52 +0100 | Subject | Re: [PATCH net v5] net: Update window_clamp if SOCK_RCVBUF is set |
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On Tue, Nov 10, 2020 at 1:16 AM Mao Wenan <wenan.mao@linux.alibaba.com> wrote: > > When net.ipv4.tcp_syncookies=1 and syn flood is happened, > cookie_v4_check or cookie_v6_check tries to redo what > tcp_v4_send_synack or tcp_v6_send_synack did, > rsk_window_clamp will be changed if SOCK_RCVBUF is set, > which will make rcv_wscale is different, the client > still operates with initial window scale and can overshot > granted window, the client use the initial scale but local > server use new scale to advertise window value, and session > work abnormally. > > Fixes: e88c64f0a425 ("tcp: allow effective reduction of TCP's rcv-buffer via setsockopt") > Signed-off-by: Mao Wenan <wenan.mao@linux.alibaba.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Thanks !
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