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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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9
net/ipv4/tcp_input.c
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@@ -3759,11 +3759,12 @@ void tcp_parse_options(const struct sk_buff *skb,
!estab && sysctl_tcp_window_scaling) {
__u8 snd_wscale = *(__u8 *)ptr;
opt_rx->wscale_ok = 1;
if (snd_wscale > 14) {
net_info_ratelimited("%s: Illegal window scaling value %d >14 received\n",
if (snd_wscale > TCP_MAX_WSCALE) {
net_info_ratelimited("%s: Illegal window scaling value %d > %u received\n",
__func__,
snd_wscale);
snd_wscale = 14;
snd_wscale,
TCP_MAX_WSCALE);
snd_wscale = TCP_MAX_WSCALE;
}
opt_rx->snd_wscale = snd_wscale;
}