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-rw-r--r--include/net/xfrm.h1
-rw-r--r--net/xfrm/xfrm_device.c2
-rw-r--r--net/xfrm/xfrm_policy.c127
-rw-r--r--net/xfrm/xfrm_state.c5
4 files changed, 132 insertions, 3 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index e0feba2ce76a..afb4929d7232 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -317,6 +317,7 @@ int xfrm_policy_register_afinfo(const struct xfrm_policy_afinfo *afinfo, int fam
void xfrm_policy_unregister_afinfo(const struct xfrm_policy_afinfo *afinfo);
void km_policy_notify(struct xfrm_policy *xp, int dir,
const struct km_event *c);
+void xfrm_policy_cache_flush(void);
void km_state_notify(struct xfrm_state *x, const struct km_event *c);
struct xfrm_tmpl;
diff --git a/net/xfrm/xfrm_device.c b/net/xfrm/xfrm_device.c
index 1f9a079e08b0..5cd7a244e88d 100644
--- a/net/xfrm/xfrm_device.c
+++ b/net/xfrm/xfrm_device.c
@@ -153,6 +153,7 @@ static int xfrm_dev_register(struct net_device *dev)
static int xfrm_dev_unregister(struct net_device *dev)
{
+ xfrm_policy_cache_flush();
return NOTIFY_DONE;
}
@@ -175,6 +176,7 @@ static int xfrm_dev_down(struct net_device *dev)
if (dev->features & NETIF_F_HW_ESP)
xfrm_dev_state_flush(dev_net(dev), dev, true);
+ xfrm_policy_cache_flush();
return NOTIFY_DONE;
}
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 0f1db4c18b22..06c3bf7ab86b 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -24,6 +24,7 @@
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/cache.h>
+#include <linux/cpu.h>
#include <linux/audit.h>
#include <net/dst.h>
#include <net/flow.h>
@@ -44,6 +45,8 @@ struct xfrm_flo {
u8 flags;
};
+static DEFINE_PER_CPU(struct xfrm_dst *, xfrm_last_dst);
+static struct work_struct *xfrm_pcpu_work __read_mostly;
static DEFINE_SPINLOCK(xfrm_policy_afinfo_lock);
static struct xfrm_policy_afinfo const __rcu *xfrm_policy_afinfo[AF_INET6 + 1]
__read_mostly;
@@ -972,6 +975,8 @@ int xfrm_policy_flush(struct net *net, u8 type, bool task_valid)
}
if (!cnt)
err = -ESRCH;
+ else
+ xfrm_policy_cache_flush();
out:
spin_unlock_bh(&net->xfrm.xfrm_policy_lock);
return err;
@@ -1700,6 +1705,102 @@ static int xfrm_expand_policies(const struct flowi *fl, u16 family,
}
+static void xfrm_last_dst_update(struct xfrm_dst *xdst, struct xfrm_dst *old)
+{
+ this_cpu_write(xfrm_last_dst, xdst);
+ if (old)
+ dst_release(&old->u.dst);
+}
+
+static void __xfrm_pcpu_work_fn(void)
+{
+ struct xfrm_dst *old;
+
+ old = this_cpu_read(xfrm_last_dst);
+ if (old && !xfrm_bundle_ok(old))
+ xfrm_last_dst_update(NULL, old);
+}
+
+static void xfrm_pcpu_work_fn(struct work_struct *work)
+{
+ local_bh_disable();
+ rcu_read_lock();
+ __xfrm_pcpu_work_fn();
+ rcu_read_unlock();
+ local_bh_enable();
+}
+
+void xfrm_policy_cache_flush(void)
+{
+ struct xfrm_dst *old;
+ bool found = 0;
+ int cpu;
+
+ local_bh_disable();
+ rcu_read_lock();
+ for_each_possible_cpu(cpu) {
+ old = per_cpu(xfrm_last_dst, cpu);
+ if (old && !xfrm_bundle_ok(old)) {
+ if (smp_processor_id() == cpu) {
+ __xfrm_pcpu_work_fn();
+ continue;
+ }
+ found = true;
+ break;
+ }
+ }
+
+ rcu_read_unlock();
+ local_bh_enable();
+
+ if (!found)
+ return;
+
+ get_online_cpus();
+
+ for_each_possible_cpu(cpu) {
+ bool bundle_release;
+
+ rcu_read_lock();
+ old = per_cpu(xfrm_last_dst, cpu);
+ bundle_release = old && !xfrm_bundle_ok(old);
+ rcu_read_unlock();
+
+ if (!bundle_release)
+ continue;
+
+ if (cpu_online(cpu)) {
+ schedule_work_on(cpu, &xfrm_pcpu_work[cpu]);
+ continue;
+ }
+
+ rcu_read_lock();
+ old = per_cpu(xfrm_last_dst, cpu);
+ if (old && !xfrm_bundle_ok(old)) {
+ per_cpu(xfrm_last_dst, cpu) = NULL;
+ dst_release(&old->u.dst);
+ }
+ rcu_read_unlock();
+ }
+
+ put_online_cpus();
+}
+
+static bool xfrm_pol_dead(struct xfrm_dst *xdst)
+{
+ unsigned int num_pols = xdst->num_pols;
+ unsigned int pol_dead = 0, i;
+
+ for (i = 0; i < num_pols; i++)
+ pol_dead |= xdst->pols[i]->walk.dead;
+
+ /* Mark DST_OBSOLETE_DEAD to fail the next xfrm_dst_check() */
+ if (pol_dead)
+ xdst->u.dst.obsolete = DST_OBSOLETE_DEAD;
+
+ return pol_dead;
+}
+
static struct xfrm_dst *
xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
const struct flowi *fl, u16 family,
@@ -1707,10 +1808,22 @@ xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
{
struct net *net = xp_net(pols[0]);
struct xfrm_state *xfrm[XFRM_MAX_DEPTH];
+ struct xfrm_dst *xdst, *old;
struct dst_entry *dst;
- struct xfrm_dst *xdst;
int err;
+ xdst = this_cpu_read(xfrm_last_dst);
+ if (xdst &&
+ xdst->u.dst.dev == dst_orig->dev &&
+ xdst->num_pols == num_pols &&
+ !xfrm_pol_dead(xdst) &&
+ memcmp(xdst->pols, pols,
+ sizeof(struct xfrm_policy *) * num_pols) == 0) {
+ dst_hold(&xdst->u.dst);
+ return xdst;
+ }
+
+ old = xdst;
/* Try to instantiate a bundle */
err = xfrm_tmpl_resolve(pols, num_pols, fl, xfrm, family);
if (err <= 0) {
@@ -1731,6 +1844,9 @@ xfrm_resolve_and_create_bundle(struct xfrm_policy **pols, int num_pols,
memcpy(xdst->pols, pols, sizeof(struct xfrm_policy *) * num_pols);
xdst->policy_genid = atomic_read(&pols[0]->genid);
+ atomic_set(&xdst->u.dst.__refcnt, 2);
+ xfrm_last_dst_update(xdst, old);
+
return xdst;
}
@@ -2843,6 +2959,15 @@ static struct pernet_operations __net_initdata xfrm_net_ops = {
void __init xfrm_init(void)
{
+ int i;
+
+ xfrm_pcpu_work = kmalloc_array(NR_CPUS, sizeof(*xfrm_pcpu_work),
+ GFP_KERNEL);
+ BUG_ON(!xfrm_pcpu_work);
+
+ for (i = 0; i < NR_CPUS; i++)
+ INIT_WORK(&xfrm_pcpu_work[i], xfrm_pcpu_work_fn);
+
register_pernet_subsys(&xfrm_net_ops);
seqcount_init(&xfrm_policy_hash_generation);
xfrm_input_init();
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 6c0956d10db6..82cbbce69b79 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -724,9 +724,10 @@ restart:
}
}
}
- if (cnt)
+ if (cnt) {
err = 0;
-
+ xfrm_policy_cache_flush();
+ }
out:
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
return err;