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netfilter: tcp: Use TCP_MAX_WSCALE instead of literal 14 

The window scale may be enlarged from 14 to 15 according to the itef
draft https://tools.ietf.org/html/draft-nishida-tcpm-maxwin-03.

Use the macro TCP_MAX_WSCALE to support it easily with TCP stack in
the future.

Signed-off-by: Gao Feng <fgao@ikuai8.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Gao Feng 2017-04-19 09:23:42 +08:00 committed by Pablo Neira Ayuso
parent be7be6e161
commit 122868b378
2 changed files with 5 additions and 6 deletions
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7
net/netfilter/nf_conntrack_proto_tcp.c
View File

@ -419,10 +419,9 @@ static void tcp_options(const struct sk_buff *skb,
&& opsize == TCPOLEN_WINDOW) {
state->td_scale = *(u_int8_t *)ptr;
if (state->td_scale > 14) {
/* See RFC1323 */
state->td_scale = 14;
}
if (state->td_scale > TCP_MAX_WSCALE)
state->td_scale = TCP_MAX_WSCALE;
state->flags |=
IP_CT_TCP_FLAG_WINDOW_SCALE;
}

4
net/netfilter/nf_synproxy_core.c
View File

@ -66,8 +66,8 @@ synproxy_parse_options(const struct sk_buff *skb, unsigned int doff,
case TCPOPT_WINDOW:
if (opsize == TCPOLEN_WINDOW) {
opts->wscale = *ptr;
if (opts->wscale > 14)
opts->wscale = 14;
if (opts->wscale > TCP_MAX_WSCALE)
opts->wscale = TCP_MAX_WSCALE;
opts->options |= XT_SYNPROXY_OPT_WSCALE;
}
break;