Hello hackers, for another purpose, I am trying to understand the relationship between gre_input and the gre pseudo-device. My understanding is that gre_input is called by IP everytime it receives a packet with a gre headers which after some processing performs IF_ENQUEUE(ifq,m) to put it back on the IPqueue so that higher protocol such TCP can do their thing. :-) I don't see how /dev/gre is ever used on receiving or sending, through if_clone_attach??. Somebody educate me on my missing link. Thank you all, Jerry.
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