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Commit c2f17e82 authored by Hannes Frederic Sowa's avatar Hannes Frederic Sowa Committed by David S. Miller
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ipv6: probe routes asynchronous in rt6_probe 



Routes need to be probed asynchronous otherwise the call stack gets
exhausted when the kernel attemps to deliver another skb inline, like
e.g. xt_TEE does, and we probe at the same time.

We update neigh->updated still at once, otherwise we would send to
many probes.

Cc: Julian Anastasov <ja@ssi.bg>
Signed-off-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3a70417c

net/ipv6/route.c

+31 −7
Original line number Diff line number Diff line
@@ -476,6 +476,24 @@ static inline struct rt6_info *rt6_device_match(struct net *net, 
}



#ifdef CONFIG_IPV6_ROUTER_PREF

struct __rt6_probe_work {

	struct work_struct work;

	struct in6_addr target;

	struct net_device *dev;

};



static void rt6_probe_deferred(struct work_struct *w)

{

	struct in6_addr mcaddr;

	struct __rt6_probe_work *work =

		container_of(w, struct __rt6_probe_work, work);



	addrconf_addr_solict_mult(&work->target, &mcaddr);

	ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL);

	dev_put(work->dev);

	kfree(w);

}



static void rt6_probe(struct rt6_info *rt)

{

	struct neighbour *neigh;
@@ -499,17 +517,23 @@ static void rt6_probe(struct rt6_info *rt) 


	if (!neigh ||

	    time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) {

		struct in6_addr mcaddr;

		struct in6_addr *target;

		struct __rt6_probe_work *work;



		if (neigh) {

		work = kmalloc(sizeof(*work), GFP_ATOMIC);



		if (neigh && work)

			neigh->updated = jiffies;



		if (neigh)

			write_unlock(&neigh->lock);

		}



		target = (struct in6_addr *)&rt->rt6i_gateway;

		addrconf_addr_solict_mult(target, &mcaddr);

		ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL);

		if (work) {

			INIT_WORK(&work->work, rt6_probe_deferred);

			work->target = rt->rt6i_gateway;

			dev_hold(rt->dst.dev);

			work->dev = rt->dst.dev;

			schedule_work(&work->work);

		}

	} else {

out:

		write_unlock(&neigh->lock);