[Click] Sending packets with a monitor mode interface

[Torquato Bertani]

There are some posts about madwifi-ng drivers and click, look for them
with Google.

For example: https://amsterdam.lcs.mit.edu/pipermail/click/2006-August/005111.html

However, IMO, the problem is that you don't use AthdescEncap() and
AthdescDecap(). I use them and it works perfectly.

Bye
Thor

On 12/11/06, David Fuste <dfuste at ac.upc.edu> wrote:
> Hello,
> I have a basic doubt with click-1.5.0 and madwifi-ng/ath0raw0 interface.
> I have a PC1 (with ath0=00:20:a6:58:55:b8) running this simple config file:
>
> ------------
> AddressInfo(safe_addr 6.0.0.1/8 ath0);
> winfo :: WirelessInfo(BSSID 00:00:00:00:00:00);
>
> InfiniteSource(DATA \<00 20 a6 58 56 40  00 20 a6 58 55 b8  0800
> 45 00 00 54  00 00 40 00  40 01 2e a7  06 00 00 02
> 06 00 00 01  08 00 97 97  03 09 00 01  60 7a 75 45
> 98 9b 04 00  08 09 0a 0b  0c 0d 0e 0f  10 11 12 13
> 14 15 16 17  18 19 1a 1b  1c 1d 1e 1f  20 21 22 23
> 24 25 26 27  28 29 2a 2b  2c 2d 2e 2f  30 31 32 33
> 34 35 36 37>, LIMIT 1, STOP true)
>         -> encap :: WifiEncap(0x0, WIRELESS_INFO winfo)
>         -> set_power :: SetTXPower(63)
>         -> set_rate :: SetTXRate(2)
>         -> radiotap_encap :: RadiotapEncap()
>         -> Print(ToDevicePC1)
>         -> ToDevice(ath0raw0);
>
> FromDevice(ath0raw0)
>        -> prism2_decap :: Prism2Decap()
>        -> extra_decap :: ExtraDecap()
>        -> radiotap_decap :: RadiotapDecap()
>        -> phyerr_filter :: FilterPhyErr()
>        -> tx_filter :: FilterTX()
>        -> dupe :: WifiDupeFilter()
>        -> wifi_cl :: Classifier(0/08%0c 1/00%03) //nods data
>        -> WifiDecap()
>        -> Print(ToHostPC1)
>        -> SetPacketType(HOST)
>        -> Discard;
> ------------
>
> The InfiniteSource data is an echo request to another PC2
> (with MAC=00:20:a6:58:56:40), which is running this other config file:
>
> ------------
> AddressInfo(safe_addr 6.0.0.2/8 ath0);
> winfo :: WirelessInfo(BSSID 00:00:00:00:00:00);
>
> FromHost(safe, safe_addr, ETHER safe_addr)
> -> Print(FromHostPC2)
> -> q :: Queue()
> -> encap :: WifiEncap(0x0, WIRELESS_INFO winfo)
> -> set_power :: SetTXPower(63)
> -> set_rate :: SetTXRate(2)
> -> radiotap_encap :: RadiotapEncap()
> -> Print(ToDevicePC2)
> -> to_dev :: ToDevice(ath0raw0);
>
>
> from_dev :: FromDevice(ath0raw0)
> -> prism2_decap :: Prism2Decap()
> -> extra_decap :: ExtraDecap()
> -> radiotap_decap :: RadiotapDecap()
> -> phyerr_filter :: FilterPhyErr()
> -> tx_filter :: FilterTX()
> -> dupe :: WifiDupeFilter()
> -> wifi_cl :: Classifier(0/08%0c 1/00%03) //nods data
> -> WifiDecap()
> -> SetPacketType(HOST)
> -> Print(ToHostPC2)
> -> ToHost(safe);
> ------------
>
> PC2 has the corresponding MAC-IP translation of PC1 in its ARP Table (added
> manually). So, when I run these click config files (in user-level mode),
> PC1 sends the echo request to PC2 and PC2 prints the received echo
> request (Print(ToHostPC2)). Moreover, PC2 generates the echo reply and
> passes
> it to click through the FromHost element. Then, click prints the echo
> reply (Print(FromHostPC2)). But from here on, click does not print the echo
> reply (Print(ToDevicePC2)) and so, does not send it.
>
> My question is, why does not the packet leave the queue? is it because the
> ToDevice element does not pull packets? why?
> I have created the ath0raw0 interface using these commands:
> %>wlanconfig ath0raw create wlandev wifi0 wlanmode monitor
> %>ifconfig ath0 up
> %>Radiotap headers:  echo '803' > /proc/sys/net/ath0/dev_type
> and I read in the madwifi web page that this monitor mode interface can
> both
> receive and send packets. So, where is my mistake?
> Is maybe a madwifi (and not click) issue?
> Could anybody tell me a good solution to perform this simple operation
> in click?
>
> I have tried a lot of configurations and I never get the correct
> operation...
> Thanks a lot!
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