Date: Thu, 3 Feb 2011 12:06:45 +0100 From: Monthadar Al Jaberi <monthadar@gmail.com> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: FreeBSD virtualization mailing list <freebsd-virtualization@freebsd.org> Subject: Re: simulating wireless device (if_alloc panic, VirtualBox, VIMAGE) Message-ID: <AANLkTi==53twyjoHL3uc4EQJCkMWdxuc9cvTNJSVuDuy@mail.gmail.com> In-Reply-To: <20110203105747.K80258@maildrop.int.zabbadoz.net> 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>
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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 panic
>> 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>
>
>
>>>> 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?
>
> --
> Bjoern A. Zeeb =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 You have to have visions!
> =A0 =A0 =A0 =A0<ks> Going to jail sucks -- <bz> All my daemons like it!
> =A0http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html
--=20
//Monthadar Al Jaberi
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