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Date: Fri, 01 Jun 2012 14:24:12 -0400 (EDT) From: David Miller <davem@...emloft.net> To: eric.dumazet@...il.com Cc: hans.schillstrom@...csson.com, netdev@...r.kernel.org, brouer@...hat.com, ncardwell@...gle.com, therbert@...gle.com Subject: Re: [PATCH] tcp: do not create inetpeer on SYNACK message From: Eric Dumazet <eric.dumazet@...il.com> Date: Fri, 01 Jun 2012 09:00:26 +0200 > From: Eric Dumazet <edumazet@...gle.com> > > Another problem on SYNFLOOD/DDOS attack is the inetpeer cache getting > larger and larger, using lots of memory and cpu time. > > tcp_v4_send_synack() > ->inet_csk_route_req() > ->ip_route_output_flow() > ->rt_set_nexthop() > ->rt_init_metrics() > ->inet_getpeer( create = true) > > This is a side effect of commit a4daad6b09230 (net: Pre-COW metrics for > TCP) added in 2.6.39 > > Possible solution : > > Instruct inet_csk_route_req() to remove FLOWI_FLAG_PRECOW_METRICS ... > Signed-off-by: Eric Dumazet <edumazet@...gle.com> This is definitely the right thing to do. Applied, thanks Eric. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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