[Redirected to -net as more appropriate] On Tue, Sep 02, 2003 at 03:06:16PM -0700, Jerry Toung wrote: > BMS, > please be patient. I guess I am still a little bit confuse as to how a > packet goes from a real NIC (i.e xl0) to the gre pseudo-device.
No problem. :-) > in if_gre.c, you define a new protocol switch in the inetdomain and > gre_input as the input processing function. > My understanding is that NIC receives a data, device driver unwraps it and > places it in &ipintrq. Then (*inetsw[ip_protox[ip->ip_p]].pr_input) in > ip_input.c points to gre_input and that's how we land in the gre module. Yes, that is broadly how it works on the inbound path. > gre_output on the other hand prepends or insert headers and make a call > to ip_output which I think will transmit the packet to the physical interface > (i.e xl0). That is also broadly how it works on the outbound path. > With all respect, I don't see any call to IF_HANDOFF in the gre code. only in > if_gif that you also wrote. I didn't write if_gif, it came from KAME. :-) Also I should add I'm looking at my own tree (which is closer to 5.1-RELEASE than -CURRENT right now), you probably want to browse source in cvsweb to get an up-to-date picture of things. BMS _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "[EMAIL PROTECTED]"
