Date: Wed, 01 Mar 2000 12:41:19 -0800 From: Julian Elischer <julian@elischer.org> To: Archie Cobbs <archie@whistle.com> Cc: Alejandro Ramirez <ales@megared.net.mx>, net@freeBSD.org Subject: Re: GRE Support in 4.X ??? Message-ID: <38BD806F.15FB7483@elischer.org> References: <200003012022.MAA71299@bubba.whistle.com>
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Archie Cobbs wrote:
>
>
> You can do GRE in FreeBSD without any modifications simply
> by opening a raw IP socket. This is how mpd does it (actually
> using ng_ksocket(8) to create the socket and ng_pptpgre(8) do
> do the handling of the GRE packets).
Ah that's how I was confused..
so we could add a generic GRE handling netgraph node as well,
so you could do netgraphy tricks as well.
>
> However, really FreeBSD should have built-in support for GRE
> so you could say, eg:
>
> s = socket(PF_INET, SOCK_DGRAM, IPPROTO_GRE);
>
> sin.sin_addr = 192.168.1.1;
> sin.sin_port = 0x883E; // GRE protocol number
>
> bind(s, (struct sockaddr *)&sin, sizeof(sin));
>
> It looks like they have done the first part (create the socket type)
> but not the second part (allow you to bind to a specific GRE protocol).
>
> Instead, they hard code the squid protocol number 0x883E into the
> kernel, turning GRE (generic routing encapsulation) into SRE (specific
> routing encapsulation :-)
>
> These patches would not be necessary if they just used a raw socket.
> On the other hand, we should add (complete) GRE support to FreeBSD
> anyway.
>
> -Archie
>
--
__--_|\ Julian Elischer
/ \ julian@elischer.org
( OZ ) World tour 2000
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