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Re: Snort 3 netmap cant access gateway on FREEBSD

From: Michael Altizer via Snort-devel <snort-devel () lists snort org>
Date: Fri, 2 Nov 2018 13:08:27 -0400
For reference, I just tested on FreeBSD 11.2 with LibDAQ 2.2.2 and the latest Snort3 code and it's working fine here.  Conveniently, you don't even have to recompile the kernel anymore since I first wrote those instructions - netmap is built in and working.
Steps (my two interfaces being bridged in inline mode are em0 and em1, I installed things into /root/install/...): 
1. Build and install libdaq 2.2.2
2. Build and install snort3
3. ifconfig em0 up promisc -lro
4. ifconfig em1 up promisc -lro
5. export LUA_PATH='/root/install/snort3/include/snort/lua/?.lua;;'
6. export SNORT_LUA_PATH=/root/install/snort3/etc/snort/
7. /root/install/snort3/bin/snort --daq-dir /root/install/daq/lib/daq/ --daq netmap -i em0:em1 -Q -c /root/install/snort3/etc/snort/snort.lua
I had no issues passing traffic across the FreeBSD device between two other devices on the same subnet.  It seems we'd need more details to help you.  The Snort shutdown stats like Masud suggested would be helpful. 

On 11/02/2018 11:51 AM, Masud Hasan (mashasan) via Snort-devel wrote:

Hi,
Would you kindly provide Snort shutdown stats to find what shows during exit.
On Nov 1, 2018, at 5:35 AM, yunus.can () arjeta com tr <mailto:yunus.can () arjeta com tr> wrote: 


hello;
We removed lro/gro and enable promiscuous mode and running snort em1:em2 inline mode with daq netmap
then All traffic breaking down to Gateway  example;  ping, ssh, internet connection
cant access (em1 connected computer(192.168.1.12))  ----> 192.168.1.1 (gateway) and cant access (em2 connected different computer(192.168.2.45)) ---> 192.168.2.1 (gateway) 
we have problem but I cant find :S
FreeBSD Version : FreeBSD snort.test 11.2-RELEASE-p4
Snort Version : Version 3.0.0 (Build 247) FreeBSD
31.10.2018, 18:53, "Masud Hasan (mashasan)" <mashasan () cisco com <mailto:mashasan () cisco com>>:
Please turn promiscuous mode on and LRO/GRO off for both of the interface-pair (em1 and em2) as root. Before running snort, please make sure you can reach any machine on the LAN where em2 is connected. After running snort with em1:em2 inlined, you should be able to reach that LAN from the LAN where em1 is connected. You can also enable debug adding "--daq-var debug" to the snort command and adding rc_debug="YES" in the rc.conf file. If netmap does not work, do other daq mode works? Here is an example for Ubuntu: 
http://sublimerobots.com/2016/02/snort-ips-inline-mode-on-ubuntu/
Also, are you on latest FreeBSD with updated netmap, since I find some online forums discussing issues with older netmap builds. 
Thanks,
Masud
On Oct 31, 2018, at 5:58 AM, yunus.can () arjeta com tr <mailto:yunus.can () arjeta com tr> wrote: 
Hello;
We are reagain install snort netmap mode. because ipfw mode not yet supported multithreading 
*rc.conf ----> network configuration*
ifconfig_em0="DHCP" ---->internet uplink      subnet -> (192.168.254.1/24) dhcp lease 
ifconfig_em1="inet 192.168.1.1 netmask 255.255.255.0"
ifconfig_em2="inet 192.168.2.1 netmask 255.255.255.0"

I was start command this :
*ifconfig em1 promisc up*
*/usr/local/snort/bin/snort -c /usr/local/snort/etc/snort/snort.lua --daq-dir /usr/local/lib/daq --daq netmap -i em1 -A alert_full -Q* 
See a Error :
netmap DAQ configured to inline.
Commencing packet processing
++ [0] em1
Can't initialize DAQ netmap (-1) - netmap_daq_initialize: Invalid interface specification: 'em1'! 
-- [0] em1
--------------------------------------------------
Packet Statistics
--------------------------------------------------
Module Statistics
--------------------------------------------------
Summary Statistics
--------------------------------------------------
timing
                  runtime: 00:00:00
                  seconds: 0.1822
                  packets: 0
                 pkts/sec: 0
o")~   Snort exiting
AND reagain diffrerent start multiple interface command this
*ifconfig em1 promisc up*
*/usr/local/snort/bin/snort -c /usr/local/snort/etc/snort/snort.lua --daq-dir /usr/local/lib/daq --daq netmap -i em1:em2 -A alert_full -Q* 
*I was see this success start message : *
port rule counts
             tcp     udp    icmp      ip
     any     472       0       1       0
   total     472       0       1       0
--------------------------------------------------
netmap DAQ configured to inline.
Commencing packet processing
++ [0] em1:em2
[em2]
  nr_tx_slots: 1024
  nr_rx_slots: 1024
  nr_tx_rings: 1
  [TX Ring 0]
    buf_ofs = 7299072
    num_slots = 1024
    nr_buf_size = 2048
    flags = 0x0
  nr_rx_rings: 1
  [RX Ring 0]
    buf_ofs = 7372800
    num_slots = 1024
    nr_buf_size = 2048
    flags = 0x0
  memsize: 343019520
  index:       1

*BUT I cant access gateway ip address*
64 bytes from 192.168.1.1: icmp_seq=6157 ttl=64 time=0.264 ms
64 bytes from 192.168.1.1: icmp_seq=6158 ttl=64 time=0.233 ms
64 bytes from 192.168.1.1: icmp_seq=6159 ttl=64 time=0.325 ms
64 bytes from 192.168.1.1: icmp_seq=6160 ttl=64 time=0.394 ms
64 bytes from 192.168.1.1: icmp_seq=6161 ttl=64 time=0.354 ms
64 bytes from 192.168.1.1: icmp_seq=6162 ttl=64 time=0.326 ms
64 bytes from 192.168.1.1: icmp_seq=6163 ttl=64 time=0.332 ms
64 bytes from 192.168.1.1: icmp_seq=6164 ttl=64 time=0.221 ms
64 bytes from 192.168.1.1: icmp_seq=6165 ttl=64 time=0.339 ms
64 bytes from 192.168.1.1: icmp_seq=6166 ttl=64 time=0.343 ms
64 bytes from 192.168.1.1: icmp_seq=6167 ttl=64 time=0.398 ms
64 bytes from 192.168.1.1: icmp_seq=6168 ttl=64 time=0.435 ms
64 bytes from 192.168.1.1: icmp_seq=6169 ttl=64 time=0.410 ms
64 bytes from 192.168.1.1: icmp_seq=6170 ttl=64 time=0.410 ms
64 bytes from 192.168.1.1: icmp_seq=6171 ttl=64 time=0.383 ms
64 bytes from 192.168.1.1: icmp_seq=6172 ttl=64 time=0.380 ms
64 bytes from 192.168.1.1: icmp_seq=6173 ttl=64 time=0.313 ms
64 bytes from 192.168.1.1: icmp_seq=6174 ttl=64 time=0.369 ms ---> *started snort inline netmap module* 
Request timeout for icmp_seq 6175
Request timeout for icmp_seq 6176
Request timeout for icmp_seq 6177
Request timeout for icmp_seq 6178
Request timeout for icmp_seq 6179
Request timeout for icmp_seq 6180
Request timeout for icmp_seq 6181

*Freebsd Versions :*

FreeBSD snort 11.2-RELEASE-p4

*Snort Versions :*

   ,,_     -*> Snort++ <*-

  o"  )~   Version 3.0.0 (Build 247) FreeBSD

   ''''    By Martin Roesch & The Snort Team

http://snort.org/contact#team
           Copyright (C) 2014-2018 Cisco and/or its affiliates. All rights reserved. 

           Copyright (C) 1998-2013 Sourcefire, Inc., et al.

           Using DAQ version 2.2.2

           Using LuaJIT version 2.0.5

           Using OpenSSL 1.0.2p  14 Aug 2018

           Using libpcap version 1.9.0-PRE-GIT

           Using PCRE version 8.41 2017-07-05

           Using ZLIB version 1.2.11

           Using FlatBuffers 1.8.0

           Using Hyperscan version 4.7.0 2018-10-03

           Using LZMA version 5.2.3

I was read this link
https://github.com/snort3/snort3/blob/master/doc/snort_manual.html --->
20.13.8. Netmap Module
        
        The netmap project is a framework for very high speed packet I/O. It
        is available on both FreeBSD and Linux with varying amounts of
        preparatory setup required. Specific notes for each follow.
        
        ./snort --daq netmap -i <device>
        [--daq-var debug]
        
        If you want to run netmap in inline mode, you must craft the device
        string as one or more interface pairs, where each member of a pair is
        separated by a single colon and each pair is separated by a double
        colon like this:
        
        em1:em2
        
        or this:
        
        em1:em2::em3:em4
        
        Inline operation performs Layer 2 forwarding with no MAC filtering,
        akin to the AFPacket module’s behavior. All packets received on one
        interface in an inline pair will be forwarded out the other interface
        unless dropped by the reader and vice versa.
        
        Important
        
        The interfaces will need to be up and in promiscuous mode in order to
        function (ifconfig em1 up promisc). The DAQ module does not currently
        do either of these configuration steps for itself.
        
        20.13.8.1. FreeBSD
        
        In FreeBSD 10.0, netmap has been integrated into the core OS. In
        order to use it, you must recompile your kernel with the line
        
        device netmap
        
        added to your kernel config.

I searched google but I cant find enough subject for netmap with snort
What is my problem ?
Can u help me ?
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