--- Ravi Samprathi <[EMAIL PROTECTED]> wrote: > See inline please.. > > On Thu, 16 May 2002, Anand S wrote: > > > We are implementing a user space router for Linux > > > > > ************************************************** > > out architecture is as follows > > > > User Space Router architecture > > ------------------------------ > > > > Incoming packet -> NETFILTER -> Queued > > packet - > > handler | > > | > > v > > reinject <- device driver <- User space > > into kernel for reinjection router > > From the device driver, you can make direct call to > the interrupt routine netif_rx(), which eventually, > thru > bh ends up calling net_rx_action in net/core/dev.c. > Is this what you are looking for?
*** we thought of calling ip_finish_output() or deve_queue_xmit() insted - will it make any difference? in any case could any one tell what are the fields in the skb and perticulerly skb->dst that i need to fill up before calling these functions ( we capture packets from NF_IP_PREROUTING) *** > > | > > V > > packet goes out > > > > > > We have implemented the "Queued packet handler" to > > take the packets given by NETFILTER and gives it > to > > the user space program > > > > The "user space routing program" takes the routing > > decision and write the packet back using write() > of > > the device driver. > > > > write() calls NETFILTER's nf_reinject() to put the > > packet back on track > > > > > *******************************************************The > > problem we have is: > > > > We want to indicate the next hop IP address for > the > > packet while reinjecting through nf_reinject(), > i.e. > > We want the forwarding to be done based on the IP > > address supplied by the user space program > > > > > ******************************************************* > > how do we do this ? > > > > We could think of these ways > > 1. setting skb->dst to correspond to the > >information about this IP address > > If you setup skb->dst yourself, you can call > ip_route_output(), > since at this point, you already have the info about > the route > (next hop). > > > 2. directly call ip_route_input() with proper > > parameters > > 3. lookup the information about this IP address > from > > the kernel's routing table > > You have to do this anyways todo [1] above. > > > > > Is any of these feasible ? > > Is there a better way ? > > Do you indicate netfilter about your stolen packet? > > > > ******************************************************* > > THANKS IN ADVANCE > > > > __________________________________________________ > > Do You Yahoo!? > > LAUNCH - Your Yahoo! Music Experience > > http://launch.yahoo.com > > > > > > __________________________________________________ Do You Yahoo!? LAUNCH - Your Yahoo! Music Experience http://launch.yahoo.com
