Hi, Adel, ip_route_output_flow() calls __ip_route_output_key(). The return value is the routing entry, rtable. the parameters for __ip_route_output_key() do not include sock; only net and flow (flp4). And the __ip_route_output_key() is exported. There is a call for xfrm_lookup() which does need a sock in ip_route_output_flow() The xfrm_lookup() is empty when building without IPsec. So in you case, if you know that your solution does not require IPSec traffic, you can use __ip_route_output_key(). rgs. Rami Rosen http://ramirose.wix.com/ramirosen On Fri, Feb 22, 2013 at 3:53 PM, Adel Qodmani <mpcadel@xxxxxxxxx> wrote: > On Fri, Feb 22, 2013 at 3:47 PM, Rami Rosen <roszenrami@xxxxxxxxx> wrote: >> >> Hi, Adel, >> >> You should use >> ip_route_output_flow(). >> For this you should construct a >> flowi4 instance. >> ip_route_output_flow() is exported via EXPORT_SYMBOL_GPL. >> >> See for example how this is done in udp_sendmsg(). >> >> Good luck! >> >> Rami Rosen >> http://ramirose.wix.com/ramirosen >> >> On Fri, Feb 22, 2013 at 2:36 PM, Adel Qodmani <mpcadel@xxxxxxxxx> wrote: >> > Hey, >> > >> > My question is quite simple, I have an sk_buff that I want to transmit, >> > the >> > sk_buff is an ICMP message and so far, I've built the headers and set up >> > everything. >> > >> > The problem is, when I want to do such a thing, I typically use a >> > function >> > called: >> > dev_queue_xmit which takes the skb and transmits the packet using the >> > net_device specified in the skb; but time time I can't set the >> > net_device, I >> > need the packet to go through the routing code and get it sent normally; >> > so >> > what function can I use to that? >> > >> > Some notes: >> > *The kernel I am working on is 3.2.0-37 >> > *I am working using Modules, so symbols that are not exported are >> > unreachable for me >> > *I set the IP header using htons, so my header data is already in >> > network >> > byte-order. >> > >> > Regards, >> > Adel >> > >> > _______________________________________________ >> > Kernelnewbies mailing list >> > Kernelnewbies@xxxxxxxxxxxxxxxxx >> > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > > > Hi Rami, > > Using ip_route_output_flow() or using udp_sendmsg() would require not only > constructing a flowi4 but also a sock; I am intentionally trying to avoid > building a sock at the time being. > Is there a way I can deliver my sk_buff to the routing code so that it'd set > the net_device in there or at least tell me which interface to use and then > I'd set it up myself? > > Thankful, > Adel _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
