See inline please.. On Thu, 16 May 2002, Anand S wrote:
> We are implementing a user space router for Linux > > *******************************************************Our > 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? > | > 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 > >
