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netfilter: synproxy: correct wscale option passing

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Timestamp are used to store additional syncookie parameters such as sack,
ecn, and wscale. The wscale value we need to encode is the client's
wscale, since we can't recover that later in the session. Next overwrite
the wscale option so the later synproxy_send_client_synack will send
the backend's wscale to the client.

Signed-off-by: Martin Topholm <[email protected]>
Reviewed-by: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: Pablo Neira Ayuso <[email protected]>
This commit is contained in:
Martin Topholm 2013-11-14 15:35:31 +01:00 • committed by Pablo Neira Ayuso
commit c1898c4c29
1 changed files with 4 additions and 3 deletions
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7
net/netfilter/nf_synproxy_core.c
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@ -151,9 +151,10 @@ void synproxy_init_timestamp_cookie(const struct xt_synproxy_info *info,
opts->tsecr = opts->tsval;
opts->tsval = tcp_time_stamp & ~0x3f;
if (opts->options & XT_SYNPROXY_OPT_WSCALE)
opts->tsval |= info->wscale;
else
if (opts->options & XT_SYNPROXY_OPT_WSCALE) {
opts->tsval |= opts->wscale;
opts->wscale = info->wscale;
} else
opts->tsval |= 0xf;
if (opts->options & XT_SYNPROXY_OPT_SACK_PERM)