[Bluez-devel] PAN and kernel 2.4.26

[Bluez-devel] PAN and kernel 2.4.26

[Bastian Ballmann]

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Hello,
I've got a little problem using PAN with a kernel 2.4.26.
If I start pand I'll get the error:
pand[698]: Bluetooth PAN daemon
pand[698]: Failed to get L2CAP options. Invalid argument(22)
I tried the same using kernel 2.6.7. and it works, but I have
to use kernel 2.4, because of a wlan driver, which is not supported
for kernel 2.6.
I tried to l2ping the bluetooth adapter, that works and I can also 
open a l2cap socket on that host, so l2cap works.
I've installed the newest bluez packages and also patched the kernel
using patch-2.4.26-mh1.gz. No effect.
Any suggestions?
Thx & Greets

Basti

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Re: [Bluez-devel] PAN and kernel 2.4.26

[Marcel Holtmann]

Hi Bastian,

> I've got a little problem using PAN with a kernel 2.4.26.
> If I start pand I'll get the error:
> pand[698]: Bluetooth PAN daemon
> pand[698]: Failed to get L2CAP options. Invalid argument(22)
> I tried the same using kernel 2.6.7. and it works, but I have
> to use kernel 2.4, because of a wlan driver, which is not supported
> for kernel 2.6.
> I tried to l2ping the bluetooth adapter, that works and I can also 
> open a l2cap socket on that host, so l2cap works.
> I've installed the newest bluez packages and also patched the kernel
> using patch-2.4.26-mh1.gz. No effect.

this should actually not fail. Do you had any 2.4 version working? What
bluez-utils version is installed?

Regards

Marcel




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Re: [Bluez-devel] PAN and kernel 2.4.26

[Bastian Ballmann]

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Hi Marcel,

On Sun, 2004-06-27 at 21:20, Marcel Holtmann wrote:

> this should actually not fail. 

I've got a 2.4.26 on my laptop and PAN is working without any 
problems, therefore it cannot be a problem with this kernel version, but
I wonder, that it's working togehter with 2.6.7.
I've absolutly no idea why this could fail on my 2.4.26er kernel...

> What bluez-utils version is installed?

It's bluez-utils-2.7. Same result using version 2.3.
Greets

Basti

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Re: [Bluez-devel] PAN and kernel 2.4.26

[Marcel Holtmann]

Hi Bastian,

> > this should actually not fail. 
> 
> I've got a 2.4.26 on my laptop and PAN is working without any 
> problems, therefore it cannot be a problem with this kernel version, but
> I wonder, that it's working togehter with 2.6.7.
> I've absolutly no idea why this could fail on my 2.4.26er kernel...

so about what kernel version are we talking that fails? I am little bit
lost.

Regards

Marcel




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Re: [Bluez-devel] PAN and kernel 2.4.26

[Bastian Ballmann]

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Hi Marcel,

On Mon, 2004-06-28 at 09:01, Marcel Holtmann wrote:

> so about what kernel version are we talking that fails? I am little bit
> lost.

PAN on 2.4.26 fails with "Failed to get L2CAP options. Invalid argument(22)",
but it cannot be a problem with that kernel version, because I am
now using the same kernel version on my laptop and PAN is working.
Greets

Basti

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Re: [Bluez-devel] PAN and kernel 2.4.26

[Marcel Holtmann]

Hi Bastian,

> > so about what kernel version are we talking that fails? I am little bit
> > lost.
> 
> PAN on 2.4.26 fails with "Failed to get L2CAP options. Invalid argument(22)",
> but it cannot be a problem with that kernel version, because I am
> now using the same kernel version on my laptop and PAN is working.

now I understand it. Is this a vanilla 2.4.26 from kernel.org?

Regards

Marcel




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Re: [Bluez-devel] PAN and kernel 2.4.26

[Bastian Ballmann]

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Hi Marcel,

On Mon, 2004-06-28 at 11:19, Marcel Holtmann wrote:
> Is this a vanilla 2.4.26 from kernel.org?

Yes it is. Including the security patch from openwall.com.
Greets

Basti

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Re: [Bluez-devel] PAN and kernel 2.4.26

[Marcel Holtmann]

Hi Bastian,

> > Is this a vanilla 2.4.26 from kernel.org?
> 
> Yes it is. Including the security patch from openwall.com.

remove the security patch and try again.

Regards

Marcel




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Re: [Bluez-devel] PAN and kernel 2.4.26

[Marcel Holtmann]

Hi Bastian,

> > remove the security patch and try again.
> 
> Same effect.

I don't think so, because I looked at the patch and this seems to
introducing the problem:

diff -urPX nopatch linux-2.4.26/net/socket.c linux/net/socket.c
--- linux-2.4.26/net/socket.c   Fri Feb 20 10:07:45 2004
+++ linux/net/socket.c  Sat Apr 17 02:13:55 2004
@@ -1307,10 +1307,18 @@
 asmlinkage long sys_getsockopt(int fd, int level, int optname, char *optval, int *optlen)
 {
        int err;
+       int len;
        struct socket *sock;
 
        if ((sock = sockfd_lookup(fd, &err))!=NULL)
        {
+               /* XXX: insufficient for SMP, but should be redundant anyway */
+               if (get_user(len, optlen))
+                       err = -EFAULT;
+               else
+               if (len < 0)
+                       err = -EINVAL;
+               else
                if (level == SOL_SOCKET)
                        err=sock_getsockopt(sock,level,optname,optval,optlen);
                else

And here is the fix for pand to also work with the patch:

diff -u -r1.4 main.c
--- main.c      31 May 2004 22:21:42 -0000      1.4
+++ main.c      28 Jun 2004 10:56:35 -0000
@@ -136,6 +136,7 @@
        }
 
        /* Setup L2CAP options according to BNEP spec */
+       olen = sizeof(l2o);
        if (getsockopt(sk, SOL_L2CAP, L2CAP_OPTIONS, &l2o, &olen) < 0) {
                syslog(LOG_ERR, "Failed to get L2CAP options. %s(%d)",
                                strerror(errno), errno);
@@ -257,6 +258,7 @@
        }
 
        /* Setup L2CAP options according to BNEP spec */
+       olen = sizeof(l2o);
        getsockopt(sk, SOL_L2CAP, L2CAP_OPTIONS, &l2o, &olen);
        l2o.imtu = l2o.omtu = BNEP_MTU;
        setsockopt(sk, SOL_L2CAP, L2CAP_OPTIONS, &l2o, sizeof(l2o));

I committed this one already to CVS, because it is an obvious fix.

Regards

Marcel




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Re: [Bluez-devel] PAN and kernel 2.4.26

[Bastian Ballmann]

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Hi Marcel,

On Mon, 2004-06-28 at 14:58, Marcel Holtmann wrote:

> I don't think so, because I looked at the patch and this seems to
> introducing the problem:

I thought it would be enough to disable all patches in my .config
and recompile the kernel, but that seems to be wrong...

> And here is the fix for pand to also work with the patch:

Yes, that works. Thanks a lot! :P
Greets

Basti

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