Commit fc1ad92d authored Mar 11, 2009 by Eric Dumazet Committed by David S. Miller Mar 11, 2009

tcp: allow timestamps even if SYN packet has tsval=0

Some systems send SYN packets with apparently wrong RFC1323 timestamp
option values [timestamp tsval=0 tsecr=0].
It might be for security reasons (http://www.secuobs.com/plugs/25220.shtml

 )

Linux TCP stack ignores this option and sends back a SYN+ACK packet
without timestamp option, thus many TCP flows cannot use timestamps
and lose some benefit of RFC1323.

Other operating systems seem to not care about initial tsval value, and let
tcp flows to negotiate timestamp option.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 3e1a3ce2

net/ipv4/tcp_ipv4.c

+0 −9

Original line number	Diff line number	Diff line
		@@ -1226,15 +1226,6 @@ int tcp_v4_conn_request(struct sock sk, struct sk_buff skb)
		if (want_cookie && !tmp_opt.saw_tstamp)
		tcp_clear_options(&tmp_opt);

		if (tmp_opt.saw_tstamp && !tmp_opt.rcv_tsval) {
		/* Some OSes (unknown ones, but I see them on web server, which
		* contains information interesting only for windows'
		* users) do not send their stamp in SYN. It is easy case.
		* We simply do not advertise TS support.
		*/
		tmp_opt.saw_tstamp = 0;
		tmp_opt.tstamp_ok = 0;
		}
		tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;

		tcp_openreq_init(req, &tmp_opt, skb);