[Click] help: for the userlevel tohost

[Huiqing Fu]

hi,
Thank you for help.
But I still can not get userlevel tohost work--let the application get the
packets.
Have you succeeded in geting ToHost work now?Or any other suggestions?

2012/7/4 heyeast <zhd5408 at gmail.com>

> hi Huiqing,
>
> It's similar with my work. This function is handled by the kernel click
> easily, but the reason I use userlevel click is that I can't compile
> patchless click on OpenWRT. I guess the same to you.
>
> I tried to set the fake0 device the same as eth0, including ip address and
> mac address. So that fake0 device could read packet from eth0 normally.
> Kernel was success to read packets from fake0 device but failed to send out
> packets from device eth0.
>
>
>
> 2012/7/4 Huiqing Fu <huiqingfu2012 at gmail.com>
>
>> hi,
>> I am trying to read packets from device eth0 to fake0 device, and add some
>> delay to the packets.
>> But, now the server can not get the packets from kernel, I guess maybe the
>> tohost fails returning the packets or the kernel drops the packets.
>> Can anyone help me to deal the problem?
>> My target is that:client send packets to eth0, but server listen to fake0.
>> So the click should read the packets from eth0 and change the packets then
>> return them to kernel, so that server
>> can get the packets.
>> The codes are below:
>>
>> // fromhost-tunnel.click
>>
>>
>>
>> // This configuration demonstrates the use of FromHost, by tunneling all
>>
>> // packets for TEST_NETWORK via the kernel Click configuration. To adapt
>>
>> // for your own use, change the AddressInfo element and replace device
>>
>> // "eth0" with your relevant device.
>>
>>
>>
>> AddressInfo(
>>
>>         // The address of a machine and a network segment.
>>
>>         // This machine will route packets for the network via FromHost,
>>
>>         // using the host address as source.
>>
>>         TEST_NETWORK 192.168.2.3/24,
>>
>>         TEST_MAC 1e:b2:02:2f:6a:0c,
>>
>>
>>
>>         // This host's real address.
>>
>>         MY_ADDR 192.168.1.1,
>>
>>
>>
>>         // The gateway machine this host really uses to send to
>> TEST_NETWORK.
>>
>>         MY_GATEWAY 192.150.187.1)
>>
>>
>>
>> elementclass FixChecksums {
>>
>>     // fix the IP checksum, and any embedded checksums that include data
>>
>>     // from the IP header (TCP and UDP in particular)
>>
>>     input -> SetIPChecksum
>>
>>         -> ipc :: IPClassifier(tcp, udp, -)
>>
>>         -> SetTCPChecksum
>>
>>         -> output;
>>
>>     ipc[1] -> SetUDPChecksum -> output;
>>
>>     ipc[2] -> output
>>
>> }
>>
>>
>>
>> th :: ToHost(fake0);
>>
>>
>>
>> FromHost(fake0, TEST_NETWORK, ETHER TEST_MAC)
>>
>>         // Respond to ARP requests
>>
>>         -> fh_cl :: Classifier(12/0806, 12/0800)
>>
>>         -> ARPResponder(0/0 1:1:1:1:1:1)
>>
>>         ->Print(fharp,60)
>>
>>         -> th
>>
>>
>>
>> // Forward IP packets from the fake device to the real Internet
>>
>> fh_cl[1] -> Strip(14)                           // remove crap Ether
>> header
>>
>>          ->Print(fhip,60)
>>
>>          -> MarkIPHeader(0)
>>
>>         -> StoreIPAddress(MY_ADDR, 12)          // store real address as
>> source
>>
>>         -> FixChecksums                         // recalculate checksum
>>
>>         -> SetIPAddress(MY_GATEWAY)             // route via gateway
>>
>>         ->Print(iparpq)
>>
>>         -> aq :: ARPQuerier(MY_ADDR, eth0)
>>
>>         -> Queue
>>
>>         -> ToDevice(eth0)
>>
>>
>>
>> // listen for ARP responses
>>
>> fd :: FromDevice(eth0,SNIFFER false)
>>
>>         -> fd_cl :: Classifier(12/0806 20/0002, 12/0800, -)
>>
>>         ->Print(fdeth0arpr,60)
>>
>>         -> t::Tee
>>
>>         -> Print(arpq)
>>
>>          -> [1]aq;
>>
>>          t[1]
>>
>>              ->Print(arpdup)
>>
>>               -> th             // ARP responses to us and host
>>
>> fd_cl[2]
>>
>>        -> Print(fdeth0other,60)
>>
>>         -> th
>>
>>
>>
>>
>>
>> // Packets arriving from the Internet from the test network must have
>> their
>>
>> // destination addresses changed, to our fake address
>>
>> fd_cl[1] -> CheckIPHeader(14)
>>
>>         // check for responses from the test network
>>
>>         -> ipc :: IPClassifier(udp port 5500, -)
>>
>>         ->Print(fdeth0ip,60)
>>
>>         // replace the real destination address with the fake address
>>
>>         ->StoreEtherAddress(TEST_MAC,0)
>>
>>         -> StoreIPAddress(TEST_NETWORK, 30)
>>
>>         -> FixChecksums
>>
>>         ->Print(udpdstfake,60)
>>
>>         -> th
>>
>> ipc[1]
>>
>>         ->CheckIPHeader(14)
>>
>>         // check for responses from the test network
>>
>>         ->Print(otherip,60)
>>
>>         // replace the real destination address with the fake address
>>
>>         ->StoreEtherAddress(TEST_MAC,0)
>>
>>         -> StoreIPAddress(TEST_NETWORK, 30)
>>
>>         -> FixChecksums
>>
>>         ->CheckIPHeader(14)
>>
>>         ->Print(dstfake,60)
>>
>>         -> th
>>
>>
>> Thank you.
>>
>> Huiqing Fu
>> _______________________________________________
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>> click at amsterdam.lcs.mit.edu
>> https://amsterdam.lcs.mit.edu/mailman/listinfo/click
>>
>
>