AW: netlink error -95 (Operation not supported) with can-utils/cangw

AW: netlink error -95 (Operation not supported) with can-utils/cangw

[Sandro Anders | CarMedialab]

Hi all,

I was able to compile the can-utils/* apps without any errors and the
most are working. But if I call the cangw command I get the following
error message: cangw -A -s can1 -d can3
netlink error -95 (Operation not supported)

Both CAN's are up and running. My assumption is that there is some
netlink support missing in my Kernel, isn't it? Thanks for your help.

Sandro 

Re: AW: netlink error -95 (Operation not supported) with can-utils/cangw

[Oliver Hartkopp]

Hi Sandro,

did you load the can-gw module?

When can-gw is not loaded the netlink functions for cangw are not registered.

Regards,
Oliver

On 04.02.2014 11:55, Sandro Anders | CarMedialab wrote:
> Hi all,
> 
> I was able to compile the can-utils/* apps without any errors and the
> most are working. But if I call the cangw command I get the following
> error message: cangw -A -s can1 -d can3
> netlink error -95 (Operation not supported)
> 
> Both CAN's are up and running. My assumption is that there is some
> netlink support missing in my Kernel, isn't it? Thanks for your help.
> 
> Sandro 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-can" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Re: AW: netlink error -95 (Operation not supported) with can-utils/cangw

[Oliver Hartkopp]

ps. You would probably like to have the option '-e' too

On 04.02.2014 12:37, Oliver Hartkopp wrote:
> Hi Sandro,
> 
> did you load the can-gw module?
> 
> When can-gw is not loaded the netlink functions for cangw are not registered.
> 
> Regards,
> Oliver
> 
> On 04.02.2014 11:55, Sandro Anders | CarMedialab wrote:
>> Hi all,
>>
>> I was able to compile the can-utils/* apps without any errors and the
>> most are working. But if I call the cangw command I get the following
>> error message: cangw -A -s can1 -d can3
>> netlink error -95 (Operation not supported)
>>
>> Both CAN's are up and running. My assumption is that there is some
>> netlink support missing in my Kernel, isn't it? Thanks for your help.
>>
>> Sandro 
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-can" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-can" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

AW: AW: netlink error -95 (Operation not supported) with can-utils/cangw

[Sandro Anders | CarMedialab]

Hi Olli,

Hmm it wasn't clear to me that an additional module is necessary for using this feature. But anyway this explains the behaviour. Is there any documentation? I couldn't find anything about can-gw in the can.txt file.

Many thanks to you and best regards,
Sandro

> -----Ursprüngliche Nachricht-----
> Von: linux-can-owner@vger.kernel.org [mailto:linux-can-
> owner@vger.kernel.org] Im Auftrag von Oliver Hartkopp
> Gesendet: Dienstag, 4. Februar 2014 12:38
> An: Sandro Anders | CarMedialab; linux-can@vger.kernel.org
> Betreff: Re: AW: netlink error -95 (Operation not supported) with can-
> utils/cangw
> 
> Hi Sandro,
> 
> did you load the can-gw module?
> 
> When can-gw is not loaded the netlink functions for cangw are not
> registered.
> 
> Regards,
> Oliver
> 
> On 04.02.2014 11:55, Sandro Anders | CarMedialab wrote:
> > Hi all,
> >
> > I was able to compile the can-utils/* apps without any errors and the
> > most are working. But if I call the cangw command I get the following
> > error message: cangw -A -s can1 -d can3
> > netlink error -95 (Operation not supported)
> >
> > Both CAN's are up and running. My assumption is that there is some
> > netlink support missing in my Kernel, isn't it? Thanks for your help.
> >
> > Sandro
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-can" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >
> --
> To unsubscribe from this list: send the line "unsubscribe linux-can" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: AW: netlink error -95 (Operation not supported) with can-utils/cangw

[Yegor Yefremov]

Hi Sandro,

you could cangw description here: http://elinux.org/Can-utils as soon
as you sort the things out.

Regards,
Yegor

On Tue, Feb 4, 2014 at 1:02 PM, Sandro Anders | CarMedialab
<sandro.anders@carmedialab.com> wrote:
> Hi Olli,
>
> Hmm it wasn't clear to me that an additional module is necessary for using this feature. But anyway this explains the behaviour. Is there any documentation? I couldn't find anything about can-gw in the can.txt file.
>
> Many thanks to you and best regards,
> Sandro
>
>> -----Ursprüngliche Nachricht-----
>> Von: linux-can-owner@vger.kernel.org [mailto:linux-can-
>> owner@vger.kernel.org] Im Auftrag von Oliver Hartkopp
>> Gesendet: Dienstag, 4. Februar 2014 12:38
>> An: Sandro Anders | CarMedialab; linux-can@vger.kernel.org
>> Betreff: Re: AW: netlink error -95 (Operation not supported) with can-
>> utils/cangw
>>
>> Hi Sandro,
>>
>> did you load the can-gw module?
>>
>> When can-gw is not loaded the netlink functions for cangw are not
>> registered.
>>
>> Regards,
>> Oliver
>>
>> On 04.02.2014 11:55, Sandro Anders | CarMedialab wrote:
>> > Hi all,
>> >
>> > I was able to compile the can-utils/* apps without any errors and the
>> > most are working. But if I call the cangw command I get the following
>> > error message: cangw -A -s can1 -d can3
>> > netlink error -95 (Operation not supported)
>> >
>> > Both CAN's are up and running. My assumption is that there is some
>> > netlink support missing in my Kernel, isn't it? Thanks for your help.
>> >
>> > Sandro
>> > --
>> > To unsubscribe from this list: send the line "unsubscribe linux-can" in
>> > the body of a message to majordomo@vger.kernel.org
>> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> >
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-can" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> --
> To unsubscribe from this list: send the line "unsubscribe linux-can" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

AW: AW: netlink error -95 (Operation not supported) with can-utils/cangw

[Sandro Anders | CarMedialab]

Hi Yegor, Hi Olli,

thanks to you it's working now. 

Regards,
Sandro

> -----Ursprüngliche Nachricht-----
> Von: linux-can-owner@vger.kernel.org [mailto:linux-can-
> owner@vger.kernel.org] Im Auftrag von Yegor Yefremov
> Gesendet: Dienstag, 4. Februar 2014 17:03
> An: Sandro Anders | CarMedialab
> Cc: Oliver Hartkopp; linux-can@vger.kernel.org
> Betreff: Re: AW: netlink error -95 (Operation not supported) with can-
> utils/cangw
> 
> Hi Sandro,
> 
> you could cangw description here: http://elinux.org/Can-utils as soon
> as you sort the things out.
> 
> Regards,
> Yegor
> 
> On Tue, Feb 4, 2014 at 1:02 PM, Sandro Anders | CarMedialab
> <sandro.anders@carmedialab.com> wrote:
> > Hi Olli,
> >
> > Hmm it wasn't clear to me that an additional module is necessary for
> using this feature. But anyway this explains the behaviour. Is there any
> documentation? I couldn't find anything about can-gw in the can.txt file.
> >
> > Many thanks to you and best regards,
> > Sandro
> >
> >> -----Ursprüngliche Nachricht-----
> >> Von: linux-can-owner@vger.kernel.org [mailto:linux-can-
> >> owner@vger.kernel.org] Im Auftrag von Oliver Hartkopp
> >> Gesendet: Dienstag, 4. Februar 2014 12:38
> >> An: Sandro Anders | CarMedialab; linux-can@vger.kernel.org
> >> Betreff: Re: AW: netlink error -95 (Operation not supported) with can-
> >> utils/cangw
> >>
> >> Hi Sandro,
> >>
> >> did you load the can-gw module?
> >>
> >> When can-gw is not loaded the netlink functions for cangw are not
> >> registered.
> >>
> >> Regards,
> >> Oliver
> >>
> >> On 04.02.2014 11:55, Sandro Anders | CarMedialab wrote:
> >> > Hi all,
> >> >
> >> > I was able to compile the can-utils/* apps without any errors and the
> >> > most are working. But if I call the cangw command I get the following
> >> > error message: cangw -A -s can1 -d can3
> >> > netlink error -95 (Operation not supported)
> >> >
> >> > Both CAN's are up and running. My assumption is that there is some
> >> > netlink support missing in my Kernel, isn't it? Thanks for your help.
> >> >
> >> > Sandro
> >> > --
> >> > To unsubscribe from this list: send the line "unsubscribe linux-can"
> in
> >> > the body of a message to majordomo@vger.kernel.org
> >> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> >> >
> >> --
> >> To unsubscribe from this list: send the line "unsubscribe linux-can" in
> >> the body of a message to majordomo@vger.kernel.org
> >> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-can" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> --
> To unsubscribe from this list: send the line "unsubscribe linux-can" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: AW: AW: netlink error -95 (Operation not supported) with can-utils/cangw

[Oliver Hartkopp]

On 04.02.2014 13:02, Sandro Anders | CarMedialab wrote:
> 
> Is there any documentation?
> 

Hi Sandro,

it's mostly 'documented by sourcecode' :-)

E.g. the netlink interface is described here:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/can/gw.h

and the cangw tool (which C-file is a good example too) has a big help text:

$ cangw 

Usage: cangw [options]

Commands:  -A (add a new rule)
           -D (delete a rule)
           -F (flush / delete all rules)
           -L (list all rules)
Mandatory: -s <src_dev>  (source netdevice)
           -d <dst_dev>  (destination netdevice)
Options:   -t (preserve src_dev rx timestamp)
           -e (echo sent frames - recommended on vcanx)
           -i (allow to route to incoming interface)
           -l <hops> (limit the number of frame hops / routings)
           -f <filter> (set CAN filter)
           -m <mod> (set frame modifications)
           -x <from_idx>:<to_idx>:<result_idx>:<init_xor_val> (XOR checksum)
           -c <from>:<to>:<result>:<init_val>:<xor_val>:<crctab[256]> (CRC8 cs)
           -p <profile>:[<profile_data>] (CRC8 checksum profile & parameters)

Values are given and expected in hexadecimal values. Leading 0s can be omitted.

<filter> is a <value><mask> CAN identifier filter
   <can_id>:<can_mask> (matches when <received_can_id> & mask == can_id & mask)
   <can_id>~<can_mask> (matches when <received_can_id> & mask != can_id & mask)

<mod> is a CAN frame modification instruction consisting of
<instruction>:<can_frame-elements>:<can_id>.<can_dlc>.<can_data>
 - <instruction> is one of 'AND' 'OR' 'XOR' 'SET'
 - <can_frame-elements> is _one_ or _more_ of 'I'dentifier 'L'ength 'D'ata
 - <can_id> is an u32 value containing the CAN Identifier
 - <can_dlc> is an u8 value containing the data length code (0 .. 8)
 - <can_data> is always eight(!) u8 values containing the CAN frames data
The max. four modifications are performed in the order AND -> OR -> XOR -> SET

Example:
cangw -A -s can0 -d vcan3 -e -f 123:C00007FF -m SET:IL:333.4.1122334455667788

Supported CRC 8 profiles:
Profile '1' (1U8)       - add one additional u8 value
Profile '2' (16U8)      - add u8 value from table[16] indexed by (data[1] & 0xF)
Profile '3' (SFFID_XOR) - add u8 value (can_id & 0xFF) ^ (can_id >> 8 & 0xFF)

$ _

The idea behind the output format of 'cangw -L' is, that all the routing jobs
can be re-directed into a (script-)file to set up the configuration again.

Regards,
Oliver