[B.A.T.M.A.N.] Batman-adv and Uevent (gateway/client modes)

[B.A.T.M.A.N.] Batman-adv and Uevent (gateway/client modes)

[cmsv]

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I have reached a point where i need to start using the uevent
functionality to work around some network scenarios when the gateways
lose internet access but i am having a bit of a difficult time
understanding how to do it since making use of uevents which is
something new to me.

The explanation here is not helping much either
http://www.open-mesh.org/projects/batman-adv/wiki/Uevent

and i understand that i might need to go to the basics to understand it
and learn how to code.

My need to use uevents to change a nodes behaviour is to change a node
from server to client and vice versa when it loses connectivity to the
WAN (not for example losing connectivity to the dsl router that is
actually the gateway but that has the node as a LAN client)

I am assuming that uevents will allow me to work with this physical
setup correct?

As far as i understand now and if i am not mistaken when a gateway loses
WAN connectivity the node that is making use of uevents will change  the
node from "server" to "client" on batman-adv .

Now my question is if i can also make it to change the dhcp setup from
dhcp server to inactive and receive it´s dhcp service from another
gateway node.

In theory  something like this would be executed on openwrt when a
gateway node detects no connectivity to the wan:

uci set batman-adv.bat0.gw_mode=client ;
uci commit batman-adv ;
batman-adv reboot ;
uci set dhcp.lan.force=0 ;
uci set dhcp.lan.ignore=1 ;
uci commit dhcp ;
/etc/init.d/dnsmasq restart ;

when it detects wan connectivity it will want to become a server and
will auto execute:

uci set batman-adv.bat0.gw_mode=server ;
uci commit batman-adv ;
batman-adv reboot ;
uci set dhcp.lan.force=1 ;
uci set dhcp.lan.ignore=0 ;
uci commit dhcp ;
/etc/init.d/dnsmasq restart ;

A small script can even be made in order so simplify things either
automatically or manually and lets call it:
gateway-mode
client-mode

Upon detecting no WAN connectivity the script will be activated.

Am i on the right track so far (at least in theory) ?

Now the second part is how to detect WAN connectivity which is different
from noticing that there is no connectivity to the actual gw router that
has the node on it's LAN.

I thought about a ping test to a few address from which after 100% loss
reply from all; something or Uevent will activate the gateway/client
mode script but it creates another problem ahead.

In a quick conversation with ordex on irc i understand that i have to
invoke the wiki docs uevent functions with the parameters i want at the
moment i decide.
This can be the gateway/client mode script

correct ?

Since uevent is something new to me; can someone recommend some freshman
tutorial that may take me in the right direction. I have no clue where
or how to start looking to code it and also when coded; where will it be
added.

I also would like to ask anyone that has uevent working how they are
using it for the same type of need and maybe even share some recipe.





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Re: [B.A.T.M.A.N.] Batman-adv and Uevent (gateway/client modes)

[Gui Iribarren]

On 04/26/2013 09:30 PM, cmsv wrote:
> I have reached a point where i need to start using the uevent
> functionality to work around some network scenarios when the gateways
> lose internet access but i am having a bit of a difficult time
> understanding how to do it since making use of uevents which is
> something new to me.
>
> The explanation here is not helping much either
> http://www.open-mesh.org/projects/batman-adv/wiki/Uevent
>
> and i understand that i might need to go to the basics to understand it
> and learn how to code.
>
> My need to use uevents to change a nodes behaviour is to change a node
> from server to client and vice versa when it loses connectivity to the
> WAN (not for example losing connectivity to the dsl router that is
> actually the gateway but that has the node as a LAN client)
>
> I am assuming that uevents will allow me to work with this physical
> setup correct?
>
> As far as i understand now and if i am not mistaken when a gateway loses
> WAN connectivity the node that is making use of uevents will change  the
> node from "server" to "client" on batman-adv .

That won't happen automatically, you need some userspace script to 
handle the event and change batman-adv gw mode

Please check

https://colectivo.altermundi.net/projects/altermesh-packages/repository/show/batman-adv-auto-gw-mode

which in turn depends on

https://colectivo.altermundi.net/projects/altermesh-packages/repository/show/watchping

you should read the source code of batman-adv-auto-gw-mode (just a few 
lines / files) and i'll comment a bit about it along this email,

you can grab the "binaries" (actually ipk-packaged bash scripts) and try 
them right away

http://chef.mesh.altermundi.net/downloads/r36139/ar71xx/packages/batman-adv-auto-gw-mode_2013-04-11-237-1_ar71xx.ipk
http://chef.mesh.altermundi.net/downloads/r36139/ar71xx/packages/watchping_2013-04-11-237-1_ar71xx.ipk


mind you, the default behaviour of sending the hostname in dhcp requests 
has changed in recent trunk builds, so this feature might not work 
reliable; but on the other hand, that might not make any difference in 
your scenario :) (you don't seem to care about hostnames)



> Now my question is if i can also make it to change the dhcp setup from
> dhcp server to inactive and receive it´s dhcp service from another
> gateway node

>
> In theory  something like this would be executed on openwrt when a
> gateway node detects no connectivity to the wan:
>
> uci set batman-adv.bat0.gw_mode=client ;
> uci commit batman-adv ;
> batman-adv reboot ;
> uci set dhcp.lan.force=0 ;
> uci set dhcp.lan.ignore=1 ;
> uci commit dhcp ;
> /etc/init.d/dnsmasq restart ;
>
> when it detects wan connectivity it will want to become a server and
> will auto execute:
>
> uci set batman-adv.bat0.gw_mode=server ;
> uci commit batman-adv ;
> batman-adv reboot ;
> uci set dhcp.lan.force=1 ;
> uci set dhcp.lan.ignore=0 ;
> uci commit dhcp ;
> /etc/init.d/dnsmasq restart ;
>
> A small script can even be made in order so simplify things either
> automatically or manually and lets call it:
> gateway-mode
> client-mode

this would equiv to

/etc/watchping/wan-ok.d/batman-gw
/etc/watchping/wan-fail.d/batman-gw

>

> Upon detecting no WAN connectivity the script will be activated.
>
> Am i on the right track so far (at least in theory) ?
>
> Now the second part is how to detect WAN connectivity which is different
> from noticing that there is no connectivity to the actual gw router that
> has the node on it's LAN.
>
> I thought about a ping test to a few address from which after 100% loss
> reply from all; something or Uevent will activate the gateway/client
> mode script but it creates another problem ahead.
>
> In a quick conversation with ordex on irc i understand that i have to
> invoke the wiki docs uevent functions with the parameters i want at the
> moment i decide.
> This can be the gateway/client mode script

Yes, in my case /etc/hotplug.d/net/99-batman-gw

>
> correct ?
>
> Since uevent is something new to me; can someone recommend some freshman
> tutorial that may take me in the right direction. I have no clue where
> or how to start looking to code it and also when coded; where will it be
> added.
>
> I also would like to ask anyone that has uevent working how they are
> using it for the same type of need and maybe even share some recipe.
>
>
>
>
>

Re: [B.A.T.M.A.N.] Batman-adv and Uevent (gateway/client modes)

[Antonio Quartulli]

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On Fri, Apr 26, 2013 at 03:30:35PM -0400, cmsv wrote:
> I have reached a point where i need to start using the uevent
> functionality to work around some network scenarios when the gateways
> lose internet access but i am having a bit of a difficult time
> understanding how to do it since making use of uevents which is
> something new to me.
> 
> The explanation here is not helping much either
> http://www.open-mesh.org/projects/batman-adv/wiki/Uevent
> 
> and i understand that i might need to go to the basics to understand it
> and learn how to code.
> 
> My need to use uevents to change a nodes behaviour is to change a node
> from server to client and vice versa when it loses connectivity to the
> WAN (not for example losing connectivity to the dsl router that is
> actually the gateway but that has the node as a LAN client)

The uevents in batman-adv (as explained in the wiki) are "messages" sent by
the kernel module when a particular event (internal to batman-adv) occurs.

WAN on/off is an event which comes from an external source and so you do not
need to bother the batman-adv's uevents.

> 
> I am assuming that uevents will allow me to work with this physical
> setup correct?
> 

Not uevents from batman-adv. If something else can trigger a uevent for you then
yes. But you will not get any help from the uevents in batman-adv in this case.


> As far as i understand now and if i am not mistaken when a gateway loses
> WAN connectivity the node that is making use of uevents will change  the
> node from "server" to "client" on batman-adv .
> 

This is a mechanism that you have to implement in your firmware. batman-adv
alone cannot do that because it does not know when the connection goes down.

I can say that this is probably a behaviour that you may want, but batman-adv
won't help you in this.

> Now my question is if i can also make it to change the dhcp setup from
> dhcp server to inactive and receive it´s dhcp service from another
> gateway node.
> 
> In theory  something like this would be executed on openwrt when a
> gateway node detects no connectivity to the wan:
> 
> uci set batman-adv.bat0.gw_mode=client ;
> uci commit batman-adv ;
> batman-adv reboot ;
> uci set dhcp.lan.force=0 ;
> uci set dhcp.lan.ignore=1 ;
> uci commit dhcp ;
> /etc/init.d/dnsmasq restart ;
> 
> when it detects wan connectivity it will want to become a server and
> will auto execute:
> 
> uci set batman-adv.bat0.gw_mode=server ;
> uci commit batman-adv ;
> batman-adv reboot ;
> uci set dhcp.lan.force=1 ;
> uci set dhcp.lan.ignore=0 ;
> uci commit dhcp ;
> /etc/init.d/dnsmasq restart ;
> 
> A small script can even be made in order so simplify things either
> automatically or manually and lets call it:
> gateway-mode
> client-mode
> 
> Upon detecting no WAN connectivity the script will be activated.
> 
> Am i on the right track so far (at least in theory) ?
> 

Maybe. All this stuff I guess have to be applied on an OpenWRT system, but I
don't know it enough to answer. Maybe on the Openwrt channel/list somebody will
be able to help you in this direction.

> Now the second part is how to detect WAN connectivity which is different
> from noticing that there is no connectivity to the actual gw router that
> has the node on it's LAN.
> 
> I thought about a ping test to a few address from which after 100% loss
> reply from all; something or Uevent will activate the gateway/client
> mode script but it creates another problem ahead.
> 
> In a quick conversation with ordex on irc i understand that i have to
> invoke the wiki docs uevent functions with the parameters i want at the
> moment i decide.

This is an internal function that can be used by a developer to "add new uevents
to batman-adv". Here you want to play with something totally external and
totally unrelated to batman-adv. So the uevents wikipage can't help you :)


> This can be the gateway/client mode script
> 
> correct ?
> 
> Since uevent is something new to me; can someone recommend some freshman
> tutorial that may take me in the right direction. I have no clue where
> or how to start looking to code it and also when coded; where will it be
> added.
> 
> I also would like to ask anyone that has uevent working how they are
> using it for the same type of need and maybe even share some recipe.
> 
> 
> 


Sometimes I used ifplugd to detect whether an Ethernet link was UP or not..you
may want to look into it as well.

Cheers,



-- 
Antonio Quartulli

..each of us alone is worth nothing..
Ernesto "Che" Guevara

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Re: [B.A.T.M.A.N.] Batman-adv and Uevent (gateway/client modes)

[cmsv]

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I took a look at your scripts and it seems we both have the same kind of
idea.

On 04/26/2013 04:40 PM, Gui Iribarren wrote:
> On 04/26/2013 09:30 PM, cmsv wrote:
>> I have reached a point where i need to start using the uevent
>> functionality to work around some network scenarios when the gateways
>> lose internet access but i am having a bit of a difficult time
>> understanding how to do it since making use of uevents which is
>> something new to me.
>>
>> The explanation here is not helping much either
>> http://www.open-mesh.org/projects/batman-adv/wiki/Uevent
>>
>> and i understand that i might need to go to the basics to understand it
>> and learn how to code.
>>
>> My need to use uevents to change a nodes behaviour is to change a node
>> from server to client and vice versa when it loses connectivity to the
>> WAN (not for example losing connectivity to the dsl router that is
>> actually the gateway but that has the node as a LAN client)
>>
>> I am assuming that uevents will allow me to work with this physical
>> setup correct?
>>
>> As far as i understand now and if i am not mistaken when a gateway loses
>> WAN connectivity the node that is making use of uevents will change  the
>> node from "server" to "client" on batman-adv .
> 
> That won't happen automatically, you need some userspace script to
> handle the event and change batman-adv gw mode
> 
correct.

> Please check
> 
> https://colectivo.altermundi.net/projects/altermesh-packages/repository/show/batman-adv-auto-gw-mode
> 
> 
> which in turn depends on
> 
> https://colectivo.altermundi.net/projects/altermesh-packages/repository/show/watchping

> 
> 
> you should read the source code of batman-adv-auto-gw-mode (just a few
> lines / files) and i'll comment a bit about it along this email,

The code is very much what i am looking for in terms of functionality


> you can grab the "binaries" (actually ipk-packaged bash scripts) and try
> them right away
> 
> http://chef.mesh.altermundi.net/downloads/r36139/ar71xx/packages/batman-adv-auto-gw-mode_2013-04-11-237-1_ar71xx.ipk
> 
> http://chef.mesh.altermundi.net/downloads/r36139/ar71xx/packages/watchping_2013-04-11-237-1_ar71xx.ipk
> 

I installed both and all files were installed in their proper
directories but for some reason it did not work :
# /etc/init.d/watchping start
uci: Entry not found

and :

# cat /etc/uci-defaults/watchping
#!/bin/sh

uci -q get system.@watchping[0] || {
        uci batch <<EOF
        add system watchping
        set system.@watchping[0].interface=wan
        set system.@watchping[0].timeout=2m
        set system.@watchping[0].pinghosts=8.8.8.8
        set system.@watchping[0].pinginterval=20s
        commit system
EOF
}


/etc/uci-defaults# ./watchping
cfg0a252a

inserted the code into /etc/config/system . that was the only way it got
there. Was it suppose to be auto-configured after the installation of
the package ?


> 
> 
> mind you, the default behaviour of sending the hostname in dhcp requests
> has changed in recent trunk builds, so this feature might not work
> reliable; but on the other hand, that might not make any difference in
> your scenario :) (you don't seem to care about hostnames)
> 
I am currently using:
DISTRIB_ID="OpenWrt"
DISTRIB_RELEASE="Attitude Adjustment"
DISTRIB_REVISION="r35153"
DISTRIB_CODENAME="attitude_adjustment"
DISTRIB_TARGET="ar71xx/generic"
DISTRIB_DESCRIPTION="OpenWrt Attitude Adjustment 12.09-rc1"

and will stay with AA for a while.

> 
> 
>> Now my question is if i can also make it to change the dhcp setup from
>> dhcp server to inactive and receive it´s dhcp service from another
>> gateway node
> 
>>
>> In theory  something like this would be executed on openwrt when a
>> gateway node detects no connectivity to the wan:
>>
>> uci set batman-adv.bat0.gw_mode=client ;
>> uci commit batman-adv ;
>> batman-adv reboot ;
>> uci set dhcp.lan.force=0 ;
>> uci set dhcp.lan.ignore=1 ;
>> uci commit dhcp ;
>> /etc/init.d/dnsmasq restart ;
>>
>> when it detects wan connectivity it will want to become a server and
>> will auto execute:
>>
>> uci set batman-adv.bat0.gw_mode=server ;
>> uci commit batman-adv ;
>> batman-adv reboot ;
>> uci set dhcp.lan.force=1 ;
>> uci set dhcp.lan.ignore=0 ;
>> uci commit dhcp ;
>> /etc/init.d/dnsmasq restart ;
>>
>> A small script can even be made in order so simplify things either
>> automatically or manually and lets call it:
>> gateway-mode
>> client-mode
> 
> this would equiv to
> 
> /etc/watchping/wan-ok.d/batman-gw
> /etc/watchping/wan-fail.d/batman-gw

I do see that inside these directories i have only a README file.
Are these directories to have my own scripts or other scripts that come
with your package ?


> 
>>
> 
>> Upon detecting no WAN connectivity the script will be activated.
>>
>> Am i on the right track so far (at least in theory) ?
>>
>> Now the second part is how to detect WAN connectivity which is different
>> from noticing that there is no connectivity to the actual gw router that
>> has the node on it's LAN.
>>
>> I thought about a ping test to a few address from which after 100% loss
>> reply from all; something or Uevent will activate the gateway/client
>> mode script but it creates another problem ahead.
>>
>> In a quick conversation with ordex on irc i understand that i have to
>> invoke the wiki docs uevent functions with the parameters i want at the
>> moment i decide.
>> This can be the gateway/client mode script
> 
> Yes, in my case /etc/hotplug.d/net/99-batman-gw


The only file i have there is /etc/hotplug.d/net/99-batman-adv  id you
rename me ?
your link to
batman-adv-auto-gw-mode/files/etc/hotplug.d/net/99-batman-gw is empty.
> 
>>
>> correct ?
>>
>> Since uevent is something new to me; can someone recommend some freshman
>> tutorial that may take me in the right direction. I have no clue where
>> or how to start looking to code it and also when coded; where will it be
>> added.
>>
>> I also would like to ask anyone that has uevent working how they are
>> using it for the same type of need and maybe even share some recipe.
>>
>>
>>
>>
>>
> 
> 

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