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net: tcp: Define the TCP_MAX_WSCALE instead of literal number 14

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Define one new macro TCP_MAX_WSCALE instead of literal number '14',
and use U16_MAX instead of 65535 as the max value of TCP window.
There is another minor change, use rounddown(space, mss) instead of
(space / mss) * mss;

Signed-off-by: Gao Feng <fgao@ikuai8.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gao Feng
2017-04-04 21:09:48 +08:00
committed by David S. Miller
parent 5e35141066
commit 589c49cbf9
4 changed files with 14 additions and 12 deletions
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2
net/ipv4/tcp.c
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@@ -2393,7 +2393,7 @@ static int tcp_repair_options_est(struct tcp_sock *tp,
u16 snd_wscale = opt.opt_val & 0xFFFF;
u16 rcv_wscale = opt.opt_val >> 16;
if (snd_wscale > 14 || rcv_wscale > 14)
if (snd_wscale > TCP_MAX_WSCALE || rcv_wscale > TCP_MAX_WSCALE)
return -EFBIG;
tp->rx_opt.snd_wscale = snd_wscale;