Date: Thu, 24 Apr 2014 10:24:10 +0400 From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: Chris Smith <chris@nevermind.co.nz>, freebsd-net@freebsd.org Subject: Re: Deleting IPv4 iface-routes from extra FIBs Message-ID: <5358AE0A.6000707@FreeBSD.org> In-Reply-To: <535836F1.5070508@nevermind.co.nz> References: <53569ABA.60007@omnilan.de> <CA%2BP_MZH_iScuJ4S=xiKocnEwTzT1eRJPNpJKbboZDfG3B=TBzA@mail.gmail.com> <535771F3.4070007@freebsd.org> <535836F1.5070508@nevermind.co.nz>
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On 24.04.2014 01:56, Chris Smith wrote: > On 23/04/14 19:55, Julian Elischer wrote: >> 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=revision&revision=248895 >>>> 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: >>>> · Host is multihomed with multiple nics in different subnets. >>>> · Jail's IP (no vnet) is from a different subnet than host's >>>> default-router subnet – jail has no ip in the range of host's >>>> default-router!!! >>>> · 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) TCP >>>> sessions. >>>> >>>> Workarround: >>>> · Abuse packet filter doing some kind of route-to… >>>> · Revert r248895, to be able to delete v4-iface-routes (inet6-routes >>>> can >>>> be deleted without any hack) >>>> >>>> Desired solution: >>>> · Allow deletion of v4-iface-routes if FIB!=0. >>>> >>>> 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… >>>> >>>> Thanks for any help, >>>> >>>> -Harry >>>> >>> Hi, >>> >>> As it was suggested before as immediate workaround you can set >>> net.add_addr_allfibs=0 so that the interface routes are added only in >>> 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. >> > Ah, this explains a thing or two. There is an ongoing work to 1) make fibs/allfibs=0 to work better 2) Move forward to make allfibs=0 as default value. > > So when allfibs=0 and an interface is bought up, it's added to the first > FIB automatically (and cannot be removed). > > Is there a way to change which fib the interface route is bought up on? > I tried to 'setfib x ifconfig ....' which didn't work. This will be fixed in near future. > > Failing that, is there a way to change the systems global FIB without > having to run every service with setfib? Basically, the behavour I want > is for interface routes to be bought up on NO fibs, and manually add > them to the fibs I need it on. If ifconfig_ifaceX="fib X inet 1.2.3.4/30" works as expected (changes interface fib to chosen one and announce interface route and host route in this particular fib) - does this sound OK to you? > >>> >>> --Nikolay >>> _______________________________________________ >>> freebsd-net@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-net >>> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >>> >>> >> >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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