forked from luck/tmp_suning_uos_patched
tcp: accommodate sequence number to a peer's shrunk receive window caused by precision loss in window scaling
Prevent sending out a left-shifted sequence number from a Linux sender in response to a peer's shrunk receive-window caused by losing least significant bits in window-scaling. Cc: "David S. Miller" <davem@davemloft.net> Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Cc: James Morris <jmorris@namei.org> Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org> Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Cheng Cui <Cheng.Cui@netapp.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -83,7 +83,8 @@ static void tcp_event_new_data_sent(struct sock *sk, const struct sk_buff *skb)
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tcp_skb_pcount(skb));
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}
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/* SND.NXT, if window was not shrunk.
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/* SND.NXT, if window was not shrunk or the amount of shrunk was less than one
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* window scaling factor due to loss of precision.
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* If window has been shrunk, what should we make? It is not clear at all.
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* Using SND.UNA we will fail to open window, SND.NXT is out of window. :-(
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* Anything in between SND.UNA...SND.UNA+SND.WND also can be already
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@ -93,7 +94,9 @@ static inline __u32 tcp_acceptable_seq(const struct sock *sk)
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{
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const struct tcp_sock *tp = tcp_sk(sk);
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if (!before(tcp_wnd_end(tp), tp->snd_nxt))
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if (!before(tcp_wnd_end(tp), tp->snd_nxt) ||
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(tp->rx_opt.wscale_ok &&
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((tp->snd_nxt - tcp_wnd_end(tp)) < (1 << tp->rx_opt.rcv_wscale))))
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return tp->snd_nxt;
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else
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return tcp_wnd_end(tp);
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