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authorYury Polyanskiy <polyanskiy@gmail.com>2009-11-08 20:58:41 -0800
committerDavid S. Miller <davem@davemloft.net>2009-11-08 20:58:41 -0800
commit9e0d57fd6dad37d72a3ca6db00ca8c76f2215454 (patch)
tree89693eb2e093da06e2228c12b43bde23e95049ad /net/xfrm
parent7a50a240c495478179f01c9df4bd75e39cff79c7 (diff)
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xfrm: SAD entries do not expire correctly after suspend-resume
This fixes the following bug in the current implementation of net/xfrm: SAD entries timeouts do not count the time spent by the machine in the suspended state. This leads to the connectivity problems because after resuming local machine thinks that the SAD entry is still valid, while it has already been expired on the remote server. The cause of this is very simple: the timeouts in the net/xfrm are bound to the old mod_timer() timers. This patch reassigns them to the CLOCK_REALTIME hrtimer. I have been using this version of the patch for a few months on my machines without any problems. Also run a few stress tests w/o any issues. This version of the patch uses tasklet_hrtimer by Peter Zijlstra (commit 9ba5f0). This patch is against 2.6.31.4. Please CC me. Signed-off-by: Yury Polyanskiy <polyanskiy@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_state.c30
1 files changed, 17 insertions, 13 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index f2f7c638083..e9ac0cec087 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -21,6 +21,9 @@
#include <linux/cache.h>
#include <linux/audit.h>
#include <asm/uaccess.h>
+#include <linux/ktime.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
#include "xfrm_hash.h"
@@ -352,7 +355,7 @@ static void xfrm_put_mode(struct xfrm_mode *mode)
static void xfrm_state_gc_destroy(struct xfrm_state *x)
{
- del_timer_sync(&x->timer);
+ tasklet_hrtimer_cancel(&x->mtimer);
del_timer_sync(&x->rtimer);
kfree(x->aalg);
kfree(x->ealg);
@@ -398,9 +401,10 @@ static inline unsigned long make_jiffies(long secs)
return secs*HZ;
}
-static void xfrm_timer_handler(unsigned long data)
+static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
{
- struct xfrm_state *x = (struct xfrm_state*)data;
+ struct tasklet_hrtimer *thr = container_of(me, struct tasklet_hrtimer, timer);
+ struct xfrm_state *x = container_of(thr, struct xfrm_state, mtimer);
struct net *net = xs_net(x);
unsigned long now = get_seconds();
long next = LONG_MAX;
@@ -451,8 +455,9 @@ static void xfrm_timer_handler(unsigned long data)
if (warn)
km_state_expired(x, 0, 0);
resched:
- if (next != LONG_MAX)
- mod_timer(&x->timer, jiffies + make_jiffies(next));
+ if (next != LONG_MAX){
+ tasklet_hrtimer_start(&x->mtimer, ktime_set(next, 0), HRTIMER_MODE_REL);
+ }
goto out;
@@ -474,6 +479,7 @@ expired:
out:
spin_unlock(&x->lock);
+ return HRTIMER_NORESTART;
}
static void xfrm_replay_timer_handler(unsigned long data);
@@ -492,7 +498,7 @@ struct xfrm_state *xfrm_state_alloc(struct net *net)
INIT_HLIST_NODE(&x->bydst);
INIT_HLIST_NODE(&x->bysrc);
INIT_HLIST_NODE(&x->byspi);
- setup_timer(&x->timer, xfrm_timer_handler, (unsigned long)x);
+ tasklet_hrtimer_init(&x->mtimer, xfrm_timer_handler, CLOCK_REALTIME, HRTIMER_MODE_ABS);
setup_timer(&x->rtimer, xfrm_replay_timer_handler,
(unsigned long)x);
x->curlft.add_time = get_seconds();
@@ -843,8 +849,7 @@ found:
hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
}
x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
- x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ;
- add_timer(&x->timer);
+ tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
net->xfrm.state_num++;
xfrm_hash_grow_check(net, x->bydst.next != NULL);
} else {
@@ -921,7 +926,7 @@ static void __xfrm_state_insert(struct xfrm_state *x)
hlist_add_head(&x->byspi, net->xfrm.state_byspi+h);
}
- mod_timer(&x->timer, jiffies + HZ);
+ tasklet_hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
if (x->replay_maxage)
mod_timer(&x->rtimer, jiffies + x->replay_maxage);
@@ -1019,8 +1024,7 @@ static struct xfrm_state *__find_acq_core(struct net *net, unsigned short family
x->props.reqid = reqid;
x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
xfrm_state_hold(x);
- x->timer.expires = jiffies + net->xfrm.sysctl_acq_expires*HZ;
- add_timer(&x->timer);
+ tasklet_hrtimer_start(&x->mtimer, ktime_set(net->xfrm.sysctl_acq_expires, 0), HRTIMER_MODE_REL);
list_add(&x->km.all, &net->xfrm.state_all);
hlist_add_head(&x->bydst, net->xfrm.state_bydst+h);
h = xfrm_src_hash(net, daddr, saddr, family);
@@ -1300,7 +1304,7 @@ out:
memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
x1->km.dying = 0;
- mod_timer(&x1->timer, jiffies + HZ);
+ tasklet_hrtimer_start(&x1->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL);
if (x1->curlft.use_time)
xfrm_state_check_expire(x1);
@@ -1325,7 +1329,7 @@ int xfrm_state_check_expire(struct xfrm_state *x)
if (x->curlft.bytes >= x->lft.hard_byte_limit ||
x->curlft.packets >= x->lft.hard_packet_limit) {
x->km.state = XFRM_STATE_EXPIRED;
- mod_timer(&x->timer, jiffies);
+ tasklet_hrtimer_start(&x->mtimer, ktime_set(0,0), HRTIMER_MODE_REL);
return -EINVAL;
}