Hi Ravi, The path that a packet goes through, from being received by the network driver and up to kernel Layer 3 (IPV4/IPV6) and from there to kernel Layer 4 (UDP/TCP/SCTP/other sockets) and from there to userspace sockets is quite complex. The logic is heavy, on that path there are lookups in routing tables, netfilter hooks, sanity checks, interaction with other subsystems, and more. In order to try to simplify things, and not go into deep technical details, we can say that generally the 5 tuple of the packet (SRC address, DST address, SRC port, DST port and protocol) is what determines to which socket it will go. Regards, Rami Rosen http://ramirose.wixsite.com/ramirosen On 16 June 2018 at 20:16, V.Ravikumar <ravikumar.vallabhu@xxxxxxxxx> wrote: > Hi All, > > I wanted to know how a packet received will be handovered to a correct user > process. > Basically I want to understand what are the various header parameters in > packet which will help to find the open socket descriptor of respective > user process. I'm not able to find the exact answers in the web. > > Thanks in advance > > Regards, > Ravi > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
