From: "Pekka Pietikäinen" <pp@ee.oulu.fi>
To: edumazet@google.com, netfilter-devel@vger.kernel.org
Subject: netfilter: xt_socket: add XT_SOCKET_NOWILDCARD flag causes behavioural change in userspace?
Date: Tue, 22 Oct 2013 16:33:48 +0300 [thread overview]
Message-ID: <52667EBC.5010709@ee.oulu.fi> (raw)
After a kernel update to 3.11 (feat. commit
681f130f39e10087475383e6771b9366e26bab0c) my "generate fake tcp
connections from random ip addresses" app broke, test case as simple as
running (on default gw of victim):
s=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.setsockopt(socket.SOL_IP, socket.IP_TRANSPARENT, 1)
s.bind(("5.5.5.5",6666))
s.connect(("192.168.122.46",22))
---
ip route flush table 100
ip rule add fwmark 1 lookup 100
ip route add local 0.0.0.0/0 dev lo table 100
---
*mangle
-N DIVERT
-A DIVERT -j MARK --set-mark 1
-A DIVERT -j ACCEPT
-A PREROUTING -p tcp -m socket -j DIVERT
and the 3-way handshake never finishes. Without -m socket (or with the
new --nowildcard) it does.
Bug, feature or end-user cluelessness? (no problem fixing my ruleset,
but it's still a behaviourial change :P )
next reply other threads:[~2013-10-22 14:25 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-22 13:33 Pekka Pietikäinen [this message]
2013-10-24 8:28 ` netfilter: xt_socket: add XT_SOCKET_NOWILDCARD flag causes behavioural change in userspace? Jari Turkia
2013-10-24 9:52 ` Pablo Neira Ayuso
2013-10-24 10:15 ` Eric Dumazet
2013-10-24 11:21 ` Pekka Pietikäinen
2013-10-24 12:05 ` Eric Dumazet
2013-10-24 12:27 ` Pekka Pietikäinen
2013-10-24 12:51 ` Florian Westphal
[not found] ` <52691D4F.4080903@ee.oulu.fi>
[not found] ` <20131024132936.GC993@breakpoint.cc>
[not found] ` <52695011.2060902@ee.oulu.fi>
2013-10-24 19:14 ` Florian Westphal
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