Netgraph ng_patch and ng_input: where to find packets?

[Julian Elischer]

On 11/24/13, 5:05 AM, Victor Gamov wrote:
> Hi All
>
> I want to get 2 or 3 copies of input packet at my system to resend it to new destinations.  So I prepare following configuration:
>
> # ipfw add 10000 ngtee 100 udp from any to 239.0.0.19 dst-port 1234 in via vlan999
>
> # ngctl mkpeer ipfw: hub 100 hub-in
> # ngctl name ipfw:100 hub100
>
> # ngctl mkpeer hub100: patch hub100-out1 in
> # ngctl name hub100:hub100-out1 patch100
> # ngctl msg patch100: setconfig '{ count=1 csum_flags=1 ops=[ { value=0xc0a8e680 offset=16 length=4 mode=1 } ] }'
>
> Now when I connect to patch:out as
> # nghook -a patch100: out
>
> then I see packets with new IP:
>
> 0000:  45 00 05 40 00 00 40 00 ff 11 b9 27 c0 a8 0d 12
> 0010:  c0 a8 e6 80 04 dc 04 dc 05 2c 00 00 47 4c ef 1a
>
> Now I want to put this packets back into IP processing to send it to new destination 192.168.230.128 (0xc0a8e680):
>
> # ngctl mkpeer patch100: ip_input out new100_to_dst_1
>
> But packets not shown on outgoing interface:
>
> # ifconfig vlan333
> vlan333: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
> 	options=103<RXCSUM,TXCSUM,TSO4>
> 	ether 00:1b:21:5b:7e:e9
> 	inet 192.168.230.9 netmask 0xffffff00 broadcast 192.168.230.255
>
> # arp 192.168.230.128
> ? (192.168.230.128) at 62:99:4c:3b:22:fc on vlan333 expires in 1190 seconds
  I would looking at giving the packet back to the firewall as suggested..

   netgraph cookie
              Divert packet into netgraph with given cookie.  The 
search termi-
              nates.  If packet is later returned from netgraph it is 
either
              accepted or continues with the next rule, depending on
              net.inet.ip.fw.one_pass sysctl variable.
see ng_ipfw for more details..

>
>
> Can somebody explain me where I was wrong?
>
> Thanks!
>
> --
> CU,
> Victor Gamov
>
>
>
>
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