Date: Thu, 3 Feb 2011 11:18:36 +0000 (UTC) From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Monthadar Al Jaberi <monthadar@gmail.com> Cc: FreeBSD virtualization mailing list <freebsd-virtualization@freebsd.org> Subject: Re: simulating wireless device (if_alloc panic, VirtualBox, VIMAGE) Message-ID: <20110203111206.S80258@maildrop.int.zabbadoz.net> In-Reply-To: <AANLkTi==53twyjoHL3uc4EQJCkMWdxuc9cvTNJSVuDuy@mail.gmail.com> References: <AANLkTik8D_bLwcUKZdBT-kpkJdDXtPTLvAqfUe0cLoSz@mail.gmail.com> <4D484213.6050100@freebsd.org> <AANLkTikJKZLQVA5X2PQs0oT4iFsZYBw7K07kjQTc9iGD@mail.gmail.com> <4D486108.5060805@freebsd.org> <AANLkTi=mk2vfyXJBaK5mV2sBWEj0-RDZneLs%2BXq_c7sb@mail.gmail.com> <20110202164827.I80258@maildrop.int.zabbadoz.net> <4D4994CE.2090209@freebsd.org> <AANLkTimDZRefv57_nanxGUbHjP1wqeQ41iWHvpXogmvU@mail.gmail.com> <4D49AB29.7070909@freebsd.org> <AANLkTinONnLE9D=c57nQmGBFbWJgqJmeKiRViW3gga2a@mail.gmail.com> <20110203095019.N80258@maildrop.int.zabbadoz.net> <AANLkTinY0AVSsEE5PZaJOqyuinsAN6wkUL9URAqYs0X4@mail.gmail.com> <20110203105747.K80258@maildrop.int.zabbadoz.net> <AANLkTi==53twyjoHL3uc4EQJCkMWdxuc9cvTNJSVuDuy@mail.gmail.com>
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This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --0-689080525-1296731916=:80258 Content-Type: TEXT/PLAIN; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE On Thu, 3 Feb 2011, Monthadar Al Jaberi wrote: > On Thu, Feb 3, 2011 at 11:59 AM, Bjoern A. Zeeb > <bzeeb-lists@lists.zabbadoz.net> wrote: >> On Thu, 3 Feb 2011, Monthadar Al Jaberi wrote: >> >>>>>> I don't understand why you saw a CRED_TO_VNET of 0 >>>>>> I was under the impression that every process/thread in the system >>>>>> would >>>>>> be >>>>>> on vnet0 >>>>>> in a vimage kernel. >>>>> >>>>> This is how my printf looks like: >>>>> struct thread *td =3D curthread; >>>>> struct vnet *v =3D TD_TO_VNET(td); >>>>> struct ucred *cred =3D CRED_TO_VNET(td->ucred); >>>>> struct vnet *td_vnet =3D td->td_vnet; >>>> >>>> here's your problem: >>>> >>>> strcut vnet *vnet =3D cred->cr_prison->pr_vnet; >>> >>> When I add CURVNET_SET(CRED_TO_VNET(curthread->td_ucred)); I get a pani= c >>> too... >>> But your suggestion works if I do like this: >>> curthread->td_vnet =3D curthread->td_ucred->cr_prison->pr_vnet; >>> >>> CRED_TO_VNET(curthread->td_ucred) returns NULL >> >> I wonder how you are building your module and if VIMAGE is properly >> defined. =A0If it's not that would explain a lot of things. > > I have put options VIMAGE, rebuild both world and kernel. > > I can create jails with vnet options... > > I build my module with the standard Makefile for modules: > ... > KMOD =3D wtap > ... > SRCS =3D if_wtap_module.c if_wtap.c if_medium.c hal.c > > .include <bsd.kmod.mk> Right but are you building your module along with the kernel or outside the tree? In the latter case you may want to add soemthing like SRCS+=3D opt_global.h =2Eif defined(KERNBUILDDIR) MKDEP=3D -include ${KERNBUILDDIR}/opt_global.h =2Eelse CFLAGS+=3D -include opt_global.h MKDEP=3D -include opt_global.h opt_global.h: echo "#define VIMAGE 1" > ${.TARGET} =2Eendif and/or point KERNBUILDDIR to where you built your kernels. >> >> >>>>> printf("td=3D%p, td->td_vnet=3D%p, td->td_ucred=3D%p, TD_TO_VNET=3D%p= , >>>>> CRED_TO_VNET=3D%p\n", td, td_vnet, td->td_ucred, v, cred); >>>>> >>>>> I made a fast search in /usr/src for "td_vnet" and found it was >>>>> assigned only in >>>>> int fork1(td, flags, pages, procp): >>>>> #ifdef VIMAGE >>>>> =A0 =A0 =A0 =A0td2->td_vnet =3D NULL; >>>>> =A0 =A0 =A0 =A0td2->td_vnet_lpush =3D NULL; >>>>> #endif >>>> >>>> Nice try. =A0Want another search? =A0Hint: there is this in vnet.h: >>>> >>>> #define curvnet curthread->td_vnet >>>> >>>> And then you'll, again, find the CURVNET_SET_* macros. >>> >>> Thank you >> >> Something you may find useful as well btw is: >> >> http://people.freebsd.org/~bz/20100530-02.vnet.9.html > > weired compiler complains about that there is no <sys/vnet.h>, I > include <net/vnet.h> maybe old documentation? it's net/vnet.h. Documentation bug from a local transisiton time to the general framework. Thanks for catching;) net/vnet.h will obviously stay. --=20 Bjoern A. Zeeb You have to have visions! <ks> Going to jail sucks -- <bz> All my daemons like it! http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html --0-689080525-1296731916=:80258--
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