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ipv6: probe routes asynchronous in rt6_probe

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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: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa 2013-10-21 06:17:15 +02:00 committed by David S. Miller
parent 3a70417c1d
commit c2f17e827b
1 changed files with 32 additions and 8 deletions
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40
net/ipv6/route.c
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@ -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;
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 (neigh)
write_unlock(&neigh->lock);
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);