linux PF_PACKET compatibility

[Vlad Galu]

On Fri, Feb 11, 2011 at 11:36 AM, Da Rock <
freebsd-hackers at herveybayaustralia.com.au> wrote:

> On 02/11/11 18:17, Julian Elischer wrote:
>
>> On 2/10/11 11:22 PM, Da Rock wrote:
>>
>>> "In recent versions of the Linux kernel (post-2.0 releases) a new
>>> protocol family has been introduced, named PF_PACKET. This family allows an
>>> application to send and receive packets dealing directly with the network
>>> card driver, thus avoiding the usual protocol stack-handling (e.g., IP/TCP
>>> or IP/UDP processing). That is, any packet sent through the socket will be
>>> directly passed to the Ethernet interface, and any packet received through
>>> the interface will be directly passed to the application."
>>>
>>> I've been chasing the answer to a FreeBSD version of this (approx.
>>> anyway), but I needed to find out what exactly PF_PACKET was first. Finally
>>> found this answer here: http://www.linuxjournal.com/article/4659
>>>
>>> I looked up man socket and I can see possibilities (in my mind anyway),
>>> but I thought I'd be best to check if the gurus here might have a better
>>> idea. My reason for this is I'm attempting to build l2tpns (which supposedly
>>> builds on 7.3?! with no trouble), and I'm chasing the errors which appear to
>>> be linuxisms mostly.
>>>
>>> So in man socket simply looking at the list of protocol families I'd say
>>> network driver level would be similar to PF_LINK link layer interface? Is
>>> there another man page I should be looking at as well?
>>>
>>
>> We don't have an exact equivalent.. but we have ways of doing the same
>>  thing.
>> one way that is suggested is to use pcap and bpf which I am pretty certain
>> has been enhanced to allow sending as
>> well as receiving.
>> you can also hook directly to the interface using netgraph(4)
>> there are other ways too but those are the two that came to mind
>> immediately.
>>
> So I'm going to have to rewrite that interface entirely? Bugger! I just
> can't fathom how this howto could even exist for l2tpns on FreeBSD if it
> isn't even close to buildable... weird!
>
> http://kuapp.com/2010/07/14/how-to-setup-l2tpipsec-vpn-on-freebsd.html
>
> Thanks guys. I'll probably come back with more problems as I slowly crack
> this one... :)
>
>
I suppose you could just use mpd :)

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