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ipv6: Keep track of DST_NOCACHE routes in case of iface down/unregister

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This patch keeps track of the DST_NOCACHE routes in a list and replaces its
dev with loopback during the iface down/unregister event.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau 2015-05-22 20:56:04 -07:00 committed by David S. Miller
parent 3da59bd945
commit 8d0b94afdc
2 changed files with 79 additions and 2 deletions
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3
include/net/ip6_fib.h
View File

@ -120,6 +120,9 @@ struct rt6_info {
struct rt6key rt6i_src;
struct rt6key rt6i_prefsrc;
struct list_head rt6i_uncached;
struct uncached_list *rt6i_uncached_list;
struct inet6_dev *rt6i_idev;
u32 rt6i_metric;

78
net/ipv6/route.c
View File

@ -105,6 +105,67 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
const struct in6_addr *gwaddr, int ifindex);
#endif
struct uncached_list {
spinlock_t lock;
struct list_head head;
};
static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
static void rt6_uncached_list_add(struct rt6_info *rt)
{
struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
rt->dst.flags |= DST_NOCACHE;
rt->rt6i_uncached_list = ul;
spin_lock_bh(&ul->lock);
list_add_tail(&rt->rt6i_uncached, &ul->head);
spin_unlock_bh(&ul->lock);
}
static void rt6_uncached_list_del(struct rt6_info *rt)
{
if (!list_empty(&rt->rt6i_uncached)) {
struct uncached_list *ul = rt->rt6i_uncached_list;
spin_lock_bh(&ul->lock);
list_del(&rt->rt6i_uncached);
spin_unlock_bh(&ul->lock);
}
}
static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
{
struct net_device *loopback_dev = net->loopback_dev;
int cpu;
for_each_possible_cpu(cpu) {
struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
struct rt6_info *rt;
spin_lock_bh(&ul->lock);
list_for_each_entry(rt, &ul->head, rt6i_uncached) {
struct inet6_dev *rt_idev = rt->rt6i_idev;
struct net_device *rt_dev = rt->dst.dev;
if (rt_idev && (rt_idev->dev == dev || !dev) &&
rt_idev->dev != loopback_dev) {
rt->rt6i_idev = in6_dev_get(loopback_dev);
in6_dev_put(rt_idev);
}
if (rt_dev && (rt_dev == dev || !dev) &&
rt_dev != loopback_dev) {
rt->dst.dev = loopback_dev;
dev_hold(rt->dst.dev);
dev_put(rt_dev);
}
}
spin_unlock_bh(&ul->lock);
}
}
static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
{
struct rt6_info *rt = (struct rt6_info *)dst;
@ -262,6 +323,7 @@ static inline struct rt6_info *ip6_dst_alloc(struct net *net,
memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
INIT_LIST_HEAD(&rt->rt6i_siblings);
INIT_LIST_HEAD(&rt->rt6i_uncached);
}
return rt;
}
@ -269,11 +331,14 @@ static inline struct rt6_info *ip6_dst_alloc(struct net *net,
static void ip6_dst_destroy(struct dst_entry *dst)
{
struct rt6_info *rt = (struct rt6_info *)dst;
struct inet6_dev *idev = rt->rt6i_idev;
struct dst_entry *from = dst->from;
struct inet6_dev *idev;
dst_destroy_metrics_generic(dst);
rt6_uncached_list_del(rt);
idev = rt->rt6i_idev;
if (idev) {
rt->rt6i_idev = NULL;
in6_dev_put(idev);
@ -920,7 +985,7 @@ redo_rt6_select:
dst_release(&rt->dst);
if (uncached_rt)
uncached_rt->dst.flags |= DST_NOCACHE;
rt6_uncached_list_add(uncached_rt);
else
uncached_rt = net->ipv6.ip6_null_entry;
dst_hold(&uncached_rt->dst);
@ -2367,6 +2432,7 @@ void rt6_ifdown(struct net *net, struct net_device *dev)
fib6_clean_all(net, fib6_ifdown, &adn);
icmp6_clean_all(fib6_ifdown, &adn);
rt6_uncached_list_flush_dev(net, dev);
}
struct rt6_mtu_change_arg {
@ -3263,6 +3329,7 @@ static struct notifier_block ip6_route_dev_notifier = {
int __init ip6_route_init(void)
{
int ret;
int cpu;
ret = -ENOMEM;
ip6_dst_ops_template.kmem_cachep =
@ -3322,6 +3389,13 @@ int __init ip6_route_init(void)
if (ret)
goto out_register_late_subsys;
for_each_possible_cpu(cpu) {
struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
INIT_LIST_HEAD(&ul->head);
spin_lock_init(&ul->lock);
}
out:
return ret;