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pfring aware applications do not reveive pkts from non-pfring NICS

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enrico.papi at cern

Sep 26, 2011, 3:33 AM

Post #1 of 7 (648 views)
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pfring aware applications do not reveive pkts from non-pfring NICS

Hi Luca,

this is our system setup:

* RedHatEnterpriseLinux 6.1
* Kernel 2.6.38.8
* libnl-devel installed
* libpcap-1.1.1-ring
* PF_RING 5.1 [modprobe pf_ring transparent_mode=1 enable_tx_capture=0
quick_mode=1]
* NICS:
o Intel 82576 with PF_RING_aware driver using NAPI (DCA and MSI-X)
[module loadef aftet pf_ring.ko]
o *Chelsio T4 using vanilla kernel driver cxgb4* [module loadef
aftet pf_ring.ko]
o another Broadcom card for management using vanilla kernel driver.

And we want to use the following software:

* tcpdump, for sniffing and testing libpcap / performance on all NICS
* snort :
o *in passive mode using daq pcap (passive) module on the Chelsio
T4 NIC
*
o *leveraging PF_RING aware drivers using daq pf_ring (passive)
module *for the Intel NIC

_Everything works fine_ if we simply:

* sniff traffic with tcpdump (compiled with -lpf_ring) on the Intel NIC
* start snort (compiled with -lpf_ring) with daq pf_ring on the Intel NIC

_Problems appears when_ we want to:

* sniff traffic with the same tcpdump (compiled with -lpf_ring) on the
Chelsio T4 NIC: *tcpdump starts but it does not receive/see any
packets. at the kernel level (ifconfig) pkts arrives...*
* start the same snort with daq pcap (compiled with -lpf_ring) on the
Chelsio T4 NIC:
o *"pcap DAQ configured to passive.
Acquiring network traffic from "eth2".
ERROR: Can't set DAQ BPF filter to
'/usr/local/etc/snort/vlan/snort.conf' (pcap_daq_set_filter:
pcap_compile: syntax error)!"*
* exactly the same happens on the Broadcom mgmt NIC.*
*

To get everything working at the same time we have to recompile libpcap
and daq and tcpdump without pf_ring support (so we lose support for
intel pf_ring drivers)
So in a few words the problem is that we cannot use with the same
sniffing software with both pf_ring aware drivers and vanilla drivers.
Accordingly to pf_ring docs and manuals and webpages and blogs this
should be possible , expecially with transparent_mode=1

This looks like a problem of the pfring library to me and not of the
pf_ring kernel module or drivers.
*For example, if we do not load pf_ring module and pf_ring aware
drivers, and simply sniff the traffic on the Chelsio T4 with Snort or
TCPDump, we have the same problems!!!
*So these applications, once they are compiled on *libpcap-1.1.1-pfring
, cannot sniff on standard NICS.*

.......
i have absolutely no other clues....
also i would like to report that in the same system with the same tools
/ versions the igb - DNA drivers causes a kernel panic when we start a
pcap dependent application on it.

Any suggestion is welcome.

Enrico.

deri at ntop

Sep 26, 2011, 5:39 AM

Post #2 of 7 (763 views)
Permalink

Re: pfring aware applications do not reveive pkts from non-pfring NICS [In reply to]

Enrico
the libpfring library is not able to set BPF filters as they fall into the libpcap domain, not PF_RING. MY colleague Alfredo is working at a fix for it that will be out later this week, so you won't have to wait too long.

Can you please let us know how to reproduce the DNA issues?

Regards Luca

On Sep 26, 2011, at 12:33 PM, Enrico Papi wrote:

> Hi Luca,
>
> this is our system setup:
> • RedHatEnterpriseLinux 6.1
> • Kernel 2.6.38.8
> • libnl-devel installed
> • libpcap-1.1.1-ring
> • PF_RING 5.1 [modprobe pf_ring transparent_mode=1 enable_tx_capture=0 quick_mode=1]
> • NICS:
> • Intel 82576 with PF_RING_aware driver using NAPI (DCA and MSI-X) [module loadef aftet pf_ring.ko]
> • Chelsio T4 using vanilla kernel driver cxgb4 [module loadef aftet pf_ring.ko]
> • another Broadcom card for management using vanilla kernel driver.
> And we want to use the following software:
> • tcpdump, for sniffing and testing libpcap / performance on all NICS
> • snort :
> • in passive mode using daq pcap (passive) module on the Chelsio T4 NIC
> • leveraging PF_RING aware drivers using daq pf_ring (passive) module for the Intel NIC
> Everything works fine if we simply:
> • sniff traffic with tcpdump (compiled with -lpf_ring) on the Intel NIC
> • start snort (compiled with -lpf_ring) with daq pf_ring on the Intel NIC
> Problems appears when we want to:
> • sniff traffic with the same tcpdump (compiled with -lpf_ring) on the Chelsio T4 NIC: tcpdump starts but it does not receive/see any packets. at the kernel level (ifconfig) pkts arrives...
> • start the same snort with daq pcap (compiled with -lpf_ring) on the Chelsio T4 NIC:
> • "pcap DAQ configured to passive.
> Acquiring network traffic from "eth2".
> ERROR: Can't set DAQ BPF filter to '/usr/local/etc/snort/vlan/snort.conf' (pcap_daq_set_filter: pcap_compile: syntax error)!"
> • exactly the same happens on the Broadcom mgmt NIC.
> To get everything working at the same time we have to recompile libpcap and daq and tcpdump without pf_ring support (so we lose support for intel pf_ring drivers)
> So in a few words the problem is that we cannot use with the same sniffing software with both pf_ring aware drivers and vanilla drivers.
> Accordingly to pf_ring docs and manuals and webpages and blogs this should be possible , expecially with transparent_mode=1
>
> This looks like a problem of the pfring library to me and not of the pf_ring kernel module or drivers.
> For example, if we do not load pf_ring module and pf_ring aware drivers, and simply sniff the traffic on the Chelsio T4 with Snort or TCPDump, we have the same problems!!!
> So these applications, once they are compiled on libpcap-1.1.1-pfring , cannot sniff on standard NICS.
>
> .......
> i have absolutely no other clues....
> also i would like to report that in the same system with the same tools / versions the igb - DNA drivers causes a kernel panic when we start a pcap dependent application on it.
>
> Any suggestion is welcome.
>
> Enrico.
>
> _______________________________________________
> Ntop-misc mailing list
> Ntop-misc [at] listgateway
> http://listgateway.unipi.it/mailman/listinfo/ntop-misc

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enrico.papi at cern

Sep 26, 2011, 11:48 AM

Post #3 of 7 (623 views)
Permalink

Re: pfring aware applications do not reveive pkts from non-pfring NICS [In reply to]

* we are not setting any BPF filter in snort config
* consider my previous post without that snort output error.

our problem shows up doing the following steps:

1. compile the tcpdump included in the pf_ring tar with
libpcap-1.1.1-pf_ring support
2. start sniffing with that tcpdump on an interface_not _pf_ring aware
after loading pf_ring module in trasparent mode = 1
3. _results: you do not see any packets_

is it normal? can you try it?

you can reproduce the same problem (no packets received) using a pf_ring
aware snort with daq PCAP (not daq pfring) on a non pf_ring nic.
in both those cases libpfring should not be used as i am not sniffing on
a pfring nic but on a standard nic and i should see packets since i am
simply using tcpdump on a standard nic.
for now i have solved in the following way:

* use snort daq pfring for all snort instances (even on the NICs not
pfring aware) -- is it correct? why it works ???
* use a tcpdump version compiled using libpcap-pfring library but
without -lpf_ring flag -- why it works ???

a further question:
can i put pf_ring in transparent mode=2 and use pf_ring aware
applications also for standard NICS?
for example, in the same enviroment described in the previous post, it
would mean using snort with daq pfring on the intel NIC and the same
snort binary with daq pcap on the Chelsio T4.
accordingly to what happens now in my system i would not see the packets
flowing in the Chelsio......

about DNA igb driver:
i have to say that we have done simply a test and we do not intend to
use dna features.

you can reproduce the problem doing:

1. compile pf_ring kernel mod, compile libpfing with dna support,
compile libpcap-pfiring, compile tcpdump with libpcap-pfring support
2. load pfring module in trasparent_mode = 2 , no tx mode, quickmode=1
3. compile and load igb 3.x DNA driver
4. start sniffing with tcpdump like this #tcpdump -i dna0
5. SYSTEM HANGS.....(i do not have trace file)

the system spec are the same of the prev. post.

On 09/26/2011 12:33 PM, Enrico Papi wrote:
> Enrico
> the libpfring library is not able to set BPF filters as they fall into
> the libpcap domain, not PF_RING. MY colleague Alfredo is working at a
> fix for it that will be out later this week, so you won't have to wait
> too long.
>
> Can you please let us know how to reproduce the DNA issues?
>
> Regards Luca
>
>

cardigliano at ntop

Sep 27, 2011, 12:56 AM

Post #4 of 7 (614 views)
Permalink

Re: pfring aware applications do not reveive pkts from non-pfring NICS [In reply to]

Enrico
see inline

On Sep 26, 2011, at 8:48 PM, Enrico Papi wrote:

> we are not setting any BPF filter in snort config
> consider my previous post without that snort output error.
> our problem shows up doing the following steps:
> compile the tcpdump included in the pf_ring tar with libpcap-1.1.1-pf_ring support
> start sniffing with that tcpdump on an interface not pf_ring aware after loading pf_ring module in trasparent mode = 1
> results: you do not see any packets
> is it normal? can you try it?

Yes, it is normal.
When PF_RING is in transparent_mode=1,2, it expects to receive packets directly from the NIC, and does *not* listen for packets coming from the linux stack.

>
> you can reproduce the same problem (no packets received) using a pf_ring aware snort with daq PCAP (not daq pfring) on a non pf_ring nic.
> in both those cases libpfring should not be used as i am not sniffing on a pfring nic but on a standard nic and i should see packets since i am simply using tcpdump on a standard nic.
> for now i have solved in the following way:
> use snort daq pfring for all snort instances (even on the NICs not pfring aware) -- is it correct? why it works ???
> use a tcpdump version compiled using libpcap-pfring library but without -lpf_ring flag -- why it works ???
>
> a further question:
> can i put pf_ring in transparent mode=2 and use pf_ring aware applications also for standard NICS?

No, with vanilla drivers you have to use transparent_mode=0

Best regards
Alfredo

> for example, in the same enviroment described in the previous post, it would mean using snort with daq pfring on the intel NIC and the same snort binary with daq pcap on the Chelsio T4.
> accordingly to what happens now in my system i would not see the packets flowing in the Chelsio......
>
> about DNA igb driver:
> i have to say that we have done simply a test and we do not intend to use dna features.
>
> you can reproduce the problem doing:
> compile pf_ring kernel mod, compile libpfing with dna support, compile libpcap-pfiring, compile tcpdump with libpcap-pfring support
> load pfring module in trasparent_mode = 2 , no tx mode, quickmode=1
> compile and load igb 3.x DNA driver
> start sniffing with tcpdump like this #tcpdump -i dna0
> SYSTEM HANGS.....(i do not have trace file)
> the system spec are the same of the prev. post.
>
>
> On 09/26/2011 12:33 PM, Enrico Papi wrote:
>>
>> Enrico
>> the libpfring library is not able to set BPF filters as they fall into the libpcap domain, not PF_RING. MY colleague Alfredo is working at a fix for it that will be out later this week, so you won't have to wait too long.
>>
>> Can you please let us know how to reproduce the DNA issues?
>>
>> Regards Luca
>>
>>
>
> _______________________________________________
> Ntop-misc mailing list
> Ntop-misc [at] listgateway
> http://listgateway.unipi.it/mailman/listinfo/ntop-misc

deri at ntop

Sep 27, 2011, 12:59 AM

Post #5 of 7 (623 views)
Permalink

Re: pfring aware applications do not reveive pkts from non-pfring NICS [In reply to]

Enrico
as follow up to your email can you please confirm if the DNA problem you reported is still present in PF_RING 5.1? If so, what hardware platform do you use?

Luca

On Sep 27, 2011, at 9:56 AM, Alfredo Cardigliano wrote:

> Enrico
> see inline
>
> On Sep 26, 2011, at 8:48 PM, Enrico Papi wrote:
>
>> we are not setting any BPF filter in snort config
>> consider my previous post without that snort output error.
>> our problem shows up doing the following steps:
>> compile the tcpdump included in the pf_ring tar with libpcap-1.1.1-pf_ring support
>> start sniffing with that tcpdump on an interface not pf_ring aware after loading pf_ring module in trasparent mode = 1
>> results: you do not see any packets
>> is it normal? can you try it?
>
> Yes, it is normal.
> When PF_RING is in transparent_mode=1,2, it expects to receive packets directly from the NIC, and does *not* listen for packets coming from the linux stack.
>
>>
>> you can reproduce the same problem (no packets received) using a pf_ring aware snort with daq PCAP (not daq pfring) on a non pf_ring nic.
>> in both those cases libpfring should not be used as i am not sniffing on a pfring nic but on a standard nic and i should see packets since i am simply using tcpdump on a standard nic.
>> for now i have solved in the following way:
>> use snort daq pfring for all snort instances (even on the NICs not pfring aware) -- is it correct? why it works ???
>> use a tcpdump version compiled using libpcap-pfring library but without -lpf_ring flag -- why it works ???
>>
>> a further question:
>> can i put pf_ring in transparent mode=2 and use pf_ring aware applications also for standard NICS?
>
> No, with vanilla drivers you have to use transparent_mode=0
>
> Best regards
> Alfredo
>
>> for example, in the same enviroment described in the previous post, it would mean using snort with daq pfring on the intel NIC and the same snort binary with daq pcap on the Chelsio T4.
>> accordingly to what happens now in my system i would not see the packets flowing in the Chelsio......
>>
>> about DNA igb driver:
>> i have to say that we have done simply a test and we do not intend to use dna features.
>>
>> you can reproduce the problem doing:
>> compile pf_ring kernel mod, compile libpfing with dna support, compile libpcap-pfiring, compile tcpdump with libpcap-pfring support
>> load pfring module in trasparent_mode = 2 , no tx mode, quickmode=1
>> compile and load igb 3.x DNA driver
>> start sniffing with tcpdump like this #tcpdump -i dna0
>> SYSTEM HANGS.....(i do not have trace file)
>> the system spec are the same of the prev. post.
>>
>>
>> On 09/26/2011 12:33 PM, Enrico Papi wrote:
>>>
>>> Enrico
>>> the libpfring library is not able to set BPF filters as they fall into the libpcap domain, not PF_RING. MY colleague Alfredo is working at a fix for it that will be out later this week, so you won't have to wait too long.
>>>
>>> Can you please let us know how to reproduce the DNA issues?
>>>
>>> Regards Luca
>>>
>>>
>>
>> _______________________________________________
>> Ntop-misc mailing list
>> Ntop-misc [at] listgateway
>> http://listgateway.unipi.it/mailman/listinfo/ntop-misc
>
> _______________________________________________
> Ntop-misc mailing list
> Ntop-misc [at] listgateway
> http://listgateway.unipi.it/mailman/listinfo/ntop-misc

enrico.papi at cern

Sep 29, 2011, 7:37 AM

Post #6 of 7 (611 views)
Permalink

pfring aware applications do not reveive pkts from non-pfring NICS [In reply to]

ok, thank you for your reply.

in general we managed the applications for working both with pfring
drivers and vanilla drivers in transparent_mode=1

anyway, it would be more appropriate defining exactly what is the
behaviuor of the applications once pfring manages the system network.
the information on the manual contain this description:

"· transparent_mode=0 (default)
Packets are received via the standard Linux interface. Any driver can
use this mode.
· transparent_mode=1 (Both vanilla and PF_RING-aware drivers)
Packets are memcpy() to PF_RING and also to the standard Linux path.
· transparent_mode=2 (PF_RING -aware drivers only)
Packets are ONLY memcpy() to PF_RING and not to the standard Linux
path (i.e. tcpdump won't
see anything).
"

from a user point of view it would be better defining, (>> for each of
the 3 modes <<), the following functionalities:

* applications compiled _with_ pfring support:
o use pfring network drivers for sniffing/injecting packets (yes/no)
o use vanilla network drivers for sniffing/injecting packets (yes/no)
* applications compiled _without_ pfring support:
o use pfring network drivers for sniffing/injecting packets (yes/no)
o use vanilla network drivers for sniffing/injecting packets (yes/no)

these 4 situazions i think can all behave in a different way.
and to further clarify describe if 'pfring support' means: pfring
support just for the library that takes care of the packtes (libpcap) or
also for the application itself.

one more thing:
reading the official documentation it can be understood that with
transparent mode = 2 all NOT pfring application will not see traffic
from ANY network interface even from the vanilla ones becasue PF_RING is
steering all the packets in his stack and not the one of the kernel.
now WHY, if i load PFRING in mode=2, i can still reach my machine with
SSH after that ??
the documentation is a bit wrong in this case, i think it must be
specified that still in in mode = 2 NOT pfring applications can still
read and write pkts on vanilla interfaces.
i think this is because of a completely separated network stack for each
of the network card on the system managed by the kernel.

for vanilla drivers loaded even AFTER of before pfring modules, all
standard applications still work and packets are still processed from
the linux kernel, even on mode=2.
so in the end the statement in the documentation on mode=2 " tcpdump
won't see anything " can be misleading and should be changed in
"tcpdump compiled without pfring support and on an interface with pfring
drivers"

regarding our problem with the dna version of igb:
we have a Dell PowerEdge 1950
i do not know for example if the problem can be the pci-e bus of only 4x

this is the output after loading the pfring version NOT the DNA!!!, now
i cannot test it again.
igb 0000:0b:00.1: PCI INT B disabled
igb 0000:0b:00.0: PCI INT A disabled
igb 0000:0b:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
igb 0000:0b:00.0: setting latency timer to 64
igb: 0000:0b:00.0: igb_validate_option: Interrupt Mode set to 2
igb 0000:0b:00.0: irq 122 for MSI/MSI-X
igb 0000:0b:00.0: irq 123 for MSI/MSI-X
igb 0000:0b:00.0: Intel(R) Gigabit Ethernet Network Connection
igb 0000:0b:00.0: eth0: (PCIe:2.5GT/s:Width x4) 00:1b:21:48:3c:ec
igb 0000:0b:00.0: eth0: PBA No: E43709-003
igb 0000:0b:00.0: Using MSI-X interrupts. 1 rx queue(s), 1 tx queue(s)
igb 0000:0b:00.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
igb 0000:0b:00.1: setting latency timer to 64
igb 0000:0b:00.1: irq 124 for MSI/MSI-X
igb 0000:0b:00.1: irq 125 for MSI/MSI-X
igb 0000:0b:00.0: MTU > 9216 not supported.
igb 0000:0b:00.1: Intel(R) Gigabit Ethernet Network Connection
igb 0000:0b:00.1: eth1: (PCIe:2.5GT/s:Width x4) 00:1b:21:48:3c:ed
igb 0000:0b:00.1: eth1: PBA No: E43709-003
igb 0000:0b:00.1: Using MSI-X interrupts. 1 rx queue(s), 1 tx queue(s)
igb 0000:0b:00.1: MTU > 9216 not supported.
igb: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
igb: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX

Enrico.

deri at ntop

Sep 29, 2011, 7:40 AM

Post #7 of 7 (632 views)
Permalink

Re: pfring aware applications do not reveive pkts from non-pfring NICS [In reply to]

Enrico
can you please split your questions into various emails? We cannot handle so long discussions

Thanks Luca

On Sep 29, 2011, at 4:37 PM, Enrico Papi wrote:

> ok, thank you for your reply.
>
> in general we managed the applications for working both with pfring drivers and vanilla drivers in transparent_mode=1
>
> anyway, it would be more appropriate defining exactly what is the behaviuor of the applications once pfring manages the system network.
> the information on the manual contain this description:
>
> "· transparent_mode=0 (default)
> Packets are received via the standard Linux interface. Any driver can use this mode.
> · transparent_mode=1 (Both vanilla and PF_RING-aware drivers)
> Packets are memcpy() to PF_RING and also to the standard Linux path.
> · transparent_mode=2 (PF_RING -aware drivers only)
> Packets are ONLY memcpy() to PF_RING and not to the standard Linux path (i.e. tcpdump won't
> see anything).
> "
>
> from a user point of view it would be better defining, (>> for each of the 3 modes <<), the following functionalities:
>
> • applications compiled with pfring support:
> • use pfring network drivers for sniffing/injecting packets (yes/no)
> • use vanilla network drivers for sniffing/injecting packets (yes/no)
> • applications compiled without pfring support:
> • use pfring network drivers for sniffing/injecting packets (yes/no)
> • use vanilla network drivers for sniffing/injecting packets (yes/no)
> these 4 situazions i think can all behave in a different way.
> and to further clarify describe if 'pfring support' means: pfring support just for the library that takes care of the packtes (libpcap) or also for the application itself.
>
> one more thing:
> reading the official documentation it can be understood that with transparent mode = 2 all NOT pfring application will not see traffic from ANY network interface even from the vanilla ones becasue PF_RING is steering all the packets in his stack and not the one of the kernel.
> now WHY, if i load PFRING in mode=2, i can still reach my machine with SSH after that ??
> the documentation is a bit wrong in this case, i think it must be specified that still in in mode = 2 NOT pfring applications can still read and write pkts on vanilla interfaces.
> i think this is because of a completely separated network stack for each of the network card on the system managed by the kernel.
>
> for vanilla drivers loaded even AFTER of before pfring modules, all standard applications still work and packets are still processed from the linux kernel, even on mode=2.
> so in the end the statement in the documentation on mode=2 " tcpdump won't see anything " can be misleading and should be changed in "tcpdump compiled without pfring support and on an interface with pfring drivers"
>
> regarding our problem with the dna version of igb:
> we have a Dell PowerEdge 1950
> i do not know for example if the problem can be the pci-e bus of only 4x
>
> this is the output after loading the pfring version NOT the DNA!!!, now i cannot test it again.
> igb 0000:0b:00.1: PCI INT B disabled
> igb 0000:0b:00.0: PCI INT A disabled
> igb 0000:0b:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
> igb 0000:0b:00.0: setting latency timer to 64
> igb: 0000:0b:00.0: igb_validate_option: Interrupt Mode set to 2
> igb 0000:0b:00.0: irq 122 for MSI/MSI-X
> igb 0000:0b:00.0: irq 123 for MSI/MSI-X
> igb 0000:0b:00.0: Intel(R) Gigabit Ethernet Network Connection
> igb 0000:0b:00.0: eth0: (PCIe:2.5GT/s:Width x4) 00:1b:21:48:3c:ec
> igb 0000:0b:00.0: eth0: PBA No: E43709-003
> igb 0000:0b:00.0: Using MSI-X interrupts. 1 rx queue(s), 1 tx queue(s)
> igb 0000:0b:00.1: PCI INT B -> GSI 17 (level, low) -> IRQ 17
> igb 0000:0b:00.1: setting latency timer to 64
> igb 0000:0b:00.1: irq 124 for MSI/MSI-X
> igb 0000:0b:00.1: irq 125 for MSI/MSI-X
> igb 0000:0b:00.0: MTU > 9216 not supported.
> igb 0000:0b:00.1: Intel(R) Gigabit Ethernet Network Connection
> igb 0000:0b:00.1: eth1: (PCIe:2.5GT/s:Width x4) 00:1b:21:48:3c:ed
> igb 0000:0b:00.1: eth1: PBA No: E43709-003
> igb 0000:0b:00.1: Using MSI-X interrupts. 1 rx queue(s), 1 tx queue(s)
> igb 0000:0b:00.1: MTU > 9216 not supported.
> igb: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
> igb: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX/TX
>
> Enrico.
>
>
> _______________________________________________
> Ntop-misc mailing list
> Ntop-misc [at] listgateway
> http://listgateway.unipi.it/mailman/listinfo/ntop-misc

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