Patch "ipv6: probe routes asynchronous in rt6_probe" has been added to the 3.11-stable tree

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This is a note to let you know that I've just added the patch titled

    ipv6: probe routes asynchronous in rt6_probe

to the 3.11-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ipv6-probe-routes-asynchronous-in-rt6_probe.patch
and it can be found in the queue-3.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 1d98ddb501bedeee62c916d3d6999109f0a22198 Mon Sep 17 00:00:00 2001
From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Date: Mon, 21 Oct 2013 06:17:15 +0200
Subject: ipv6: probe routes asynchronous in rt6_probe

From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>

[ Upstream commit c2f17e827b419918c856131f592df9521e1a38e3 ]

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@xxxxxx>
Signed-off-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv6/route.c |   38 +++++++++++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 7 deletions(-)

--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -477,6 +477,24 @@ out:
 }
 
 #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;
@@ -500,17 +518,23 @@ static void rt6_probe(struct rt6_info *r
 
 	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);


Patches currently in stable-queue which might be from hannes@xxxxxxxxxxxxxxxxxxx are

queue-3.11/ipv6-always-prefer-rt6i_gateway-if-present.patch
queue-3.11/netfilter-nf_conntrack-fix-rt6i_gateway-checks-for-h.323-helper.patch
queue-3.11/inet-fix-possible-memory-corruption-with-udp_cork-and-ufo.patch
queue-3.11/ipv6-probe-routes-asynchronous-in-rt6_probe.patch
queue-3.11/ipv6-fill-rt6i_gateway-with-nexthop-address.patch
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