On Sat, Jan 27, 2007 at 12:44:29AM +0900, YOSHIFUJI Hideaki / 吉藤英明 wrote: > In article <[EMAIL PROTECTED]> (at Fri, 26 Jan 2007 09:27:30 -0500), Neil > Horman <[EMAIL PROTECTED]> says: > > > I'm looking for it at the moment, but I too had assumed that redirecting the > > outgoing packet to the default router would happen automatically within the > > routing code as a result of not having a completed neighbor entry available. > > Since I've modified ndisc_send_ns such that we will never send Neighbor > > solicitations from an optimistic address, as per section 3.2, we'll never > > get a > > completed neightbor entry while the address is optimistic. If thats not the > > case, I'd welcome some suggestions on how to implement this (given that I'm > > not > > overly familiar with the code right now). From what I see, I think the > > routing > > code will select the default route when rti6_nexthop is null during route > > selection, which it will be if the neighbor entry doesn't get resolved. Not > > 100% sure though. Let me know what you think. > > (Now I remember that I hit similar issue before when I once > tried to implement this....) > > Well... no, you cannot assume that routing code solves this issue. > This is not so trivial, and I am not aware clean solution yet... > > On reason of this issue is because the source address may not be > probided by user, and the source address selection will be done > after looking up routing table. > > One possibiliy is to solve by rt->rt6i_nexthop->output(), > but I guess we will hit some race condition. > > Hmm... > Is this perhaps something we can do in ip6_output2? We can test the interface flags there and if the interface is optimistic, we can lookup the default route (perhaps via rt6_lookup, using the unspecified address for the daddr), and then replace skb->dst with the dst_entry retrieved from the lookup, which should give us the proper mac header construction starting in ip6_output_finish.
What do you think? Neil - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
