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authorFernando Fernandez Mancera <ffmancera@riseup.net>2019-07-10 12:05:57 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2019-07-16 13:17:01 +0200
commitb83329fb473f29d34d85d642e3a3313bb2871fa9 (patch)
tree446974de0e1933d23c2b080b815a31b473b3f736 /net/ipv4
parentf41828ee10b36644bb2b2bfa9dd1d02f55aa0516 (diff)
netfilter: synproxy: fix erroneous tcp mss option
Now synproxy sends the mss value set by the user on client syn-ack packet instead of the mss value that client announced. Fixes: 48b1de4c110a ("netfilter: add SYNPROXY core/target") Signed-off-by: Fernando Fernandez Mancera <ffmancera@riseup.net> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/ipt_SYNPROXY.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_SYNPROXY.c b/net/ipv4/netfilter/ipt_SYNPROXY.c
index 8e7f84ec783d..0e70f3f65f6f 100644
--- a/net/ipv4/netfilter/ipt_SYNPROXY.c
+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
@@ -36,6 +36,8 @@ synproxy_tg4(struct sk_buff *skb, const struct xt_action_param *par)
opts.options |= XT_SYNPROXY_OPT_ECN;
opts.options &= info->options;
+ opts.mss_encode = opts.mss;
+ opts.mss = info->mss;
if (opts.options & XT_SYNPROXY_OPT_TIMESTAMP)
synproxy_init_timestamp_cookie(info, &opts);
else