Date: Mon, 13 Oct 2014 10:35:33 +0200 From: Harald Schmalzbauer <h.schmalzbauer@omnilan.de> To: Julian Elischer <julian@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org>, FreeBSD <freebsd-stable@freebsd.org> Subject: Re: Deleting IPv4 iface-routes from extra FIBs Message-ID: <543B8ED5.6040206@omnilan.de> In-Reply-To: <535771F3.4070007@freebsd.org> References: <53569ABA.60007@omnilan.de> <CA%2BP_MZH_iScuJ4S=xiKocnEwTzT1eRJPNpJKbboZDfG3B=TBzA@mail.gmail.com> <535771F3.4070007@freebsd.org>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig6230EC5227E68E506CAFA445 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Bez=C3=BCglich Julian Elischer's Nachricht vom 23.04.2014 09:55 (localti= me): > On 4/23/14, 4:38 AM, Nikolay Denev wrote: >> On Tue, Apr 22, 2014 at 5:37 PM, Harald Schmalzbauer >> <h.schmalzbauer@omnilan.de> wrote: >>> Hello, >>> >>> here, http://svnweb.freebsd.org/base?view=3Drevision&revision=3D24889= 5 >>> interface route protection was added (so the following problem arose >>> with 9.2). >>> >>> Unfortunately, in my case, I must be able to delete these routes; >>> not in >>> the default FIB, but in jail's fibs, because: >>> =C2=B7 Host is multihomed with multiple nics in different subnets. >>> =C2=B7 Jail's IP (no vnet) is from a different subnet than host's >>> default-router subnet =E2=80=93 jail has no ip in the range of host's= >>> default-router!!! >>> =C2=B7 FIB used by jail contains valid default-router. >>> >>> Problem: >>> If iface-routes exist in jail's FIB, answer-packets take the >>> iface-shortcut, not trespassing the router (default gateway); hence >>> 3way-handshake never finishes and firewall terminates (half-opened) T= CP >>> sessions. >>> >>> Workarround: >>> =C2=B7 Abuse packet filter doing some kind of route-to=E2=80=A6 >>> =C2=B7 Revert r248895, to be able to delete v4-iface-routes (inet6-ro= utes >>> can >>> be deleted without any hack) >>> >>> Desired solution: >>> =C2=B7 Allow deletion of v4-iface-routes if FIB!=3D0. >>> >>> Unfortunately my C skills don't allow me to implement this myself :-(= >>> I can't even follow the code, I guess that was originally considered,= >>> but possibly doesn't work bacause of a simple bug?!? I took the lazy >>> way >>> and simply reverted r248895 instead of trying to understand >>> rtrequest1_fib(). I wish I had the time to learn=E2=80=A6 >>> >>> Thanks for any help, >>> >>> -Harry >>> >> Hi, >> >> As it was suggested before as immediate workaround you can set >> net.add_addr_allfibs=3D0 so that the interface routes are added only i= n >> the default FIB. > > yes, we made two behaviours. > Add interface routes to all active FIBS or only add them to the first > fib and let the user populate other fibs as needed. > It appears you want the second behaviour, so I suggest you use that > option and set up all your routes manually. Hello, last time I had the iface-route problem, I just reverted r248895 (for 9.3). There was inconsitent behaviour with v6 iface routes and net.add_addr_allfibs=3D0. Now I checked with 10.1 ans it seems net.add_addr_allfibs=3D0 doesn't wor= k any more: netstat -f inet -nr Routing tables Internet: Destination Gateway Flags Netif Expire default 172.21.32.1 UGS egn 127.0.0.1 link#2 UH lo0 172.21.32.0/19 link#1 U egn 172.21.35.1 link#1 UHS lo0 netstat -F 1 -f inet -nr Routing tables (fib: 1) Internet: Destination Gateway Flags Netif Expire 127.0.0.1 link#2 UH lo0 172.21.32.0/19 link#1 U egn 'sysctl net.add_addr_allfibs' net.add_addr_allfibs: 0 Shouldn't the routing table for fib1 stay empty? Can't remember the result when I testet that with 9.3 :-( Thanks, -Harry --------------enig6230EC5227E68E506CAFA445 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAlQ7jtYACgkQLDqVQ9VXb8gJHQCfQKViwDAMUH8tgn4hfo0G93k3 mhUAoKjj8OX/wKIwfyQmvAwCWEfJdOja =zn/y -----END PGP SIGNATURE----- --------------enig6230EC5227E68E506CAFA445--
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