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Intermediate Functional Block (IFB = x-IMQ) usage ?
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tnt
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PostPosted: Tue Apr 11, 2006 7:24 pm    Post subject: Intermediate Functional Block (IFB = x-IMQ) usage ? Reply with quote

There is Intermediate Functional Block (IFB) that replaces Intermediate Queuing Machine (IMQ) in recent kernels.

Can someone tell me how to use new IFB?

I was able to bring up ifb0 device but I can't redirect traffic to it.
In old IMQ I've been using something like this:
Code:
iptables -t mangle -A PREROUTING -i eth2 -j IMQ --todev 0

but now it doesn't work.

Any ideas?
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PostPosted: Wed Apr 12, 2006 4:30 pm    Post subject: Reply with quote

Use tc ???

I found in source code of drivers/net/ifb.c folowing comment:
Quote:
You need the tc action mirror or redirect to feed this device
packets.


Let us know if U will sucesfull. I have no time to test it but I will need it soon :)
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frido
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PostPosted: Thu Apr 20, 2006 4:06 pm    Post subject: Reply with quote

check this http://linux-net.osdl.org/index.php/IFB
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tnt
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PostPosted: Thu Apr 20, 2006 7:18 pm    Post subject: Reply with quote

when I try example given there I get:
Code:
modprobe ifb

ifconfig ifb0 up

ifconfig
eth0      Link encap:Ethernet  HWaddr 00:15:F2:AC:F7:AC
          inet addr:10.0.9.66  Bcast:10.0.9.127  Mask:255.255.255.192
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2404385 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2203654 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2592797554 (2472.6 Mb)  TX bytes:1974750383 (1883.2 Mb)
          Interrupt:217 Memory:db000000-0

ifb0      Link encap:Ethernet  HWaddr 4A:98:47:A7:2C:BB
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:32
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:17728 errors:0 dropped:0 overruns:0 frame:0
          TX packets:17728 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:3233642 (3.0 Mb)  TX bytes:3233642 (3.0 Mb)

lsmod
Module                  Size  Used by
xt_mark                 2240  0
xt_MARK                 2944  0
ifb                     4104  0
it87                   23268  0
hwmon_vid               2624  1 it87
i2c_isa                 4608  1 it87

tc filter add dev eth0 parent ffff: protocol ip prio 10 u32 \
> match u32 0 0 flowid 1:1 \
> action ipt -j MARK --set-mark 1 \
> action mirred egress redirect dev ifb0
/usr/local/lib/iptables/libipt_mark.so: cannot open shared object file: No such file or directory
 failed to find target MARK

bad action parsing
parse_action: bad value (11:ipt)!
Illegal "action"


what do I miss?
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frido
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PostPosted: Sat Apr 22, 2006 7:39 pm    Post subject: Reply with quote

Quote:

Code:

tc filter add dev eth0 parent ffff: protocol ip prio 10 u32 \
> match u32 0 0 flowid 1:1 \
> action ipt -j MARK --set-mark 1 \
> action mirred egress redirect dev ifb0
/usr/local/lib/iptables/libipt_mark.so: cannot open shared object file: No such file or directory
 failed to find target MARK

bad action parsing
parse_action: bad value (11:ipt)!
Illegal "action"



This is strange. Is your iproute2 installed by emerge ??
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tnt
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PostPosted: Sun Apr 23, 2006 2:36 pm    Post subject: Reply with quote

frido wrote:
This is strange. Is your iproute2 installed by emerge ??

Yes, it is:
Code:
emerge -pv iproute2

These are the packages that I would merge, in order:

Calculating dependencies ...done!
[ebuild   R   ] sys-apps/iproute2-2.6.15.20060110  -atm -berkdb -minimal 0 kB

Total size of downloads: 0 kB

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PostPosted: Sun Apr 30, 2006 1:36 am    Post subject: Reply with quote

I had to make symbolic link
Code:
/usr/local/lib/iptables -> /lib/iptables

to be able to use those example scripts.
It's
Code:
/usr/local/lib/iptables -> /lib64/iptables

on amd64 systems.

On x86 system everything works fine, but unfortunately on amd64 I've got hard-lock at this point:
Code:
manchester tc # ./script.bsh
tablename: mangle hook: NF_IP_PRE_ROUTING
        target: MARK set 0x1  index 0
Action 4 device ifb0 ifindex 5
     


Connection with that machine disappeared and I'll have to go there to reset it manualy. :(
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PostPosted: Sun Apr 30, 2006 9:42 pm    Post subject: Reply with quote

here is the (very sad) epilogue of whole story:

http://forums.gentoo.org/viewtopic-t-458545.html


:cry:
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