On Wed, May 29, 2013 at 08:36:50AM -0700, Mihail Costea wrote: > On 26 May 2013 07:02, Antonio Quartulli <[email protected]> wrote: > > On Fri, May 17, 2013 at 03:27:51PM +0300, Mihail wrote: > >> From: "[email protected]" <[email protected]> > >> > >> Added functions needed for NDP snooping, like getting the IPv6 addresses > >> or getting the target HW address from an Neighbor Advertisement (NA). > >> Also added functions to create NA for Neighbor > >> Solicitations that have already the HW address in DAT. > >> > >> Problems: I have to generate router and override flags for NA. For now > >> I don't now exactly how to get them. From what I've seen, batman could > >> now which nodes are routers, but for override flag, we should find a > >> mechanism to know if the node is proxy or has anycast address. > >> For inspiration I have used the code at: <net/ipv6/ndisc.c>. > > > > What is the concept you have in mind? > > Maybe you first explain a bit more about your idea so that we can help you > > in > > find a way to implement that. > > > > You want to edit the router address and flags carried by the NA? > > > > When creating the NA response for an HW address already contained in > the DAT, I must set 3 flags: router, solicited and override. > > The solicited flag is 1 because I only answer to solicited NS. > > The router flag should be 1 only if the device for which we have the > HW address is a router. From what I've seen there are some functions > in batatv for finding routers, but I'll have to see if they can be > used on the nodes connected to mesh-nodes. Or maybe there is another > way to see if the device is a router.
I guess here you are looking for an IPv6 router, right? so a node which advertised itself as it, correct? In this case in batman-adv there is nothing which can help you because there is no IPv6 detection of any type.. How can we recognise if a node is advertising itself as router? maybe by snooping other NDP messages? > > About the override flag, I don't really have an idea. I didn't > understand very well how it was calculated in net/ipv6/ndisc.c so I > set it to 1 by default (it should be 0 for proxy and anycast address). > mh..ok. We may want to better check this once more to avoid triggering any strange behaviour in the network :) Cheers, -- Antonio Quartulli ..each of us alone is worth nothing.. Ernesto "Che" Guevara
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