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Diffstat (limited to 'net/ipv6/route.c')
-rw-r--r--net/ipv6/route.c32
1 files changed, 24 insertions, 8 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 87a0561136dd..6181b4a18178 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1274,18 +1274,29 @@ static DEFINE_SPINLOCK(rt6_exception_lock);
static void rt6_remove_exception(struct rt6_exception_bucket *bucket,
struct rt6_exception *rt6_ex)
{
+ struct fib6_info *from;
struct net *net;
if (!bucket || !rt6_ex)
return;
net = dev_net(rt6_ex->rt6i->dst.dev);
+ net->ipv6.rt6_stats->fib_rt_cache--;
+
+ /* purge completely the exception to allow releasing the held resources:
+ * some [sk] cache may keep the dst around for unlimited time
+ */
+ from = rcu_dereference_protected(rt6_ex->rt6i->from,
+ lockdep_is_held(&rt6_exception_lock));
+ rcu_assign_pointer(rt6_ex->rt6i->from, NULL);
+ fib6_info_release(from);
+ dst_dev_put(&rt6_ex->rt6i->dst);
+
hlist_del_rcu(&rt6_ex->hlist);
dst_release(&rt6_ex->rt6i->dst);
kfree_rcu(rt6_ex, rcu);
WARN_ON_ONCE(!bucket->depth);
bucket->depth--;
- net->ipv6.rt6_stats->fib_rt_cache--;
}
/* Remove oldest rt6_ex in bucket and free the memory
@@ -1599,15 +1610,15 @@ static int rt6_remove_exception_rt(struct rt6_info *rt)
static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
{
struct rt6_exception_bucket *bucket;
- struct fib6_info *from = rt->from;
struct in6_addr *src_key = NULL;
struct rt6_exception *rt6_ex;
-
- if (!from ||
- !(rt->rt6i_flags & RTF_CACHE))
- return;
+ struct fib6_info *from;
rcu_read_lock();
+ from = rcu_dereference(rt->from);
+ if (!from || !(rt->rt6i_flags & RTF_CACHE))
+ goto unlock;
+
bucket = rcu_dereference(from->rt6i_exception_bucket);
#ifdef CONFIG_IPV6_SUBTREES
@@ -1626,6 +1637,7 @@ static void rt6_update_exception_stamp_rt(struct rt6_info *rt)
if (rt6_ex)
rt6_ex->stamp = jiffies;
+unlock:
rcu_read_unlock();
}
@@ -2736,20 +2748,24 @@ static int ip6_route_check_nh_onlink(struct net *net,
u32 tbid = l3mdev_fib_table(dev) ? : RT_TABLE_MAIN;
const struct in6_addr *gw_addr = &cfg->fc_gateway;
u32 flags = RTF_LOCAL | RTF_ANYCAST | RTF_REJECT;
+ struct fib6_info *from;
struct rt6_info *grt;
int err;
err = 0;
grt = ip6_nh_lookup_table(net, cfg, gw_addr, tbid, 0);
if (grt) {
+ rcu_read_lock();
+ from = rcu_dereference(grt->from);
if (!grt->dst.error &&
/* ignore match if it is the default route */
- grt->from && !ipv6_addr_any(&grt->from->fib6_dst.addr) &&
+ from && !ipv6_addr_any(&from->fib6_dst.addr) &&
(grt->rt6i_flags & flags || dev != grt->dst.dev)) {
NL_SET_ERR_MSG(extack,
"Nexthop has invalid gateway or device mismatch");
err = -EINVAL;
}
+ rcu_read_unlock();
ip6_rt_put(grt);
}
@@ -4643,7 +4659,7 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
table = rt->fib6_table->tb6_id;
else
table = RT6_TABLE_UNSPEC;
- rtm->rtm_table = table;
+ rtm->rtm_table = table < 256 ? table : RT_TABLE_COMPAT;
if (nla_put_u32(skb, RTA_TABLE, table))
goto nla_put_failure;