Date: Wed, 1 Mar 2000 16:04:38 -0500 (EST) From: Garrett Wollman <wollman@khavrinen.lcs.mit.edu> To: Archie Cobbs <archie@whistle.com> Cc: wollman@khavrinen.lcs.mit.edu (Garrett Wollman), julian@elischer.org (Julian Elischer), ales@megared.net.mx (Alejandro Ramirez), net@FreeBSD.ORG Subject: Re: GRE Support in 4.X ??? Message-ID: <200003012104.QAA64880@khavrinen.lcs.mit.edu> In-Reply-To: <200003012039.MAA71524@bubba.whistle.com> References: <200003012036.PAA64720@khavrinen.lcs.mit.edu> <200003012039.MAA71524@bubba.whistle.com>
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<<On Wed, 1 Mar 2000 12:39:19 -0800 (PST), Archie Cobbs <archie@whistle.com> said:
> Sorry, I don't understand your point here. What does TCP
> have to do with anything?
Look at the code for a moment:
if (ntohl(gre->type) != GRE_PROTOCOL_TYPE) {
rip_input(m, iphlen);
return;
}
So, if it's not the protocol we're expecting, we just punt it to the
SOCK_RAW interface.
len = m->m_len - len;
if (ip->ip_len != len) {
if (len > ip->ip_len || len < sizeof(struct ip)) {
m_freem(m);
return;
}
m_adj(m, iphlen + sizeof(struct gre));
}
ip_input(m);
Otherwise, decapsulate the packet and hand it directly to the IP layer
to be acted upon as if it had been received directly. The user then
configures IPFIREWALL_FORWARD to send the packet to lo0 where it gets
interpreted by the local protocol stack.
-GAWollman
--
Garrett A. Wollman | O Siem / We are all family / O Siem / We're all the same
wollman@lcs.mit.edu | O Siem / The fires of freedom
Opinions not those of| Dance in the burning flame
MIT, LCS, CRS, or NSA| - Susan Aglukark and Chad Irschick
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