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xfrm: Remove ancient sleeping when the SA is in acquire state

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We now queue packets to the policy if the states are not yet resolved,
this replaces the ancient sleeping code. Also the sleeping can cause
indefinite task hangs if the needed state does not get resolved.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2013-08-27 13:43:30 +02:00
parent 283bc9f35b
commit 5b8ef3415a
4 changed files with 5 additions and 44 deletions
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2
include/net/netns/xfrm.h
View file

@ -33,8 +33,6 @@ struct netns_xfrm {
struct hlist_head state_gc_list;
struct work_struct state_gc_work;
wait_queue_head_t km_waitq;
struct list_head policy_all;
struct hlist_head *policy_byidx;
unsigned int policy_idx_hmask;

5
net/key/af_key.c
View file

@ -1380,10 +1380,9 @@ static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, const struct sadb
return 0;
spin_lock_bh(&x->lock);
if (x->km.state == XFRM_STATE_ACQ) {
if (x->km.state == XFRM_STATE_ACQ)
x->km.state = XFRM_STATE_ERROR;
wake_up(&net->xfrm.km_waitq);
}
spin_unlock_bh(&x->lock);
xfrm_state_put(x);
return 0;

21
net/xfrm/xfrm_policy.c
View file

@ -1901,8 +1901,7 @@ static struct xfrm_dst *xfrm_create_dummy_bundle(struct net *net,
if (IS_ERR(xdst))
return xdst;
if (net->xfrm.sysctl_larval_drop || num_xfrms <= 0 ||
(fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP))
if (net->xfrm.sysctl_larval_drop || num_xfrms <= 0)
return xdst;
dst1 = &xdst->u.dst;
@ -2077,7 +2076,6 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
int i, err, num_pols, num_xfrms = 0, drop_pols = 0;
restart:
dst = NULL;
xdst = NULL;
route = NULL;
@ -2157,23 +2155,8 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
return make_blackhole(net, family, dst_orig);
}
if (fl->flowi_flags & FLOWI_FLAG_CAN_SLEEP) {
DECLARE_WAITQUEUE(wait, current);
add_wait_queue(&net->xfrm.km_waitq, &wait);
set_current_state(TASK_INTERRUPTIBLE);
schedule();
set_current_state(TASK_RUNNING);
remove_wait_queue(&net->xfrm.km_waitq, &wait);
if (!signal_pending(current)) {
dst_release(dst);
goto restart;
}
err = -ERESTART;
} else
err = -EAGAIN;
err = -EAGAIN;
XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTNOSTATES);
goto error;

21
net/xfrm/xfrm_state.c
View file

@ -372,8 +372,6 @@ static void xfrm_state_gc_task(struct work_struct *work)
hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
xfrm_state_gc_destroy(x);
wake_up(&net->xfrm.km_waitq);
}
static inline unsigned long make_jiffies(long secs)
@ -388,7 +386,6 @@ static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
{
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;
int warn = 0;
@ -458,12 +455,8 @@ static enum hrtimer_restart xfrm_timer_handler(struct hrtimer * me)
goto out;
expired:
if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
x->km.state = XFRM_STATE_EXPIRED;
wake_up(&net->xfrm.km_waitq);
next = 2;
goto resched;
}
err = __xfrm_state_delete(x);
if (!err)
@ -635,7 +628,6 @@ int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info)
out:
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
wake_up(&net->xfrm.km_waitq);
return err;
}
EXPORT_SYMBOL(xfrm_state_flush);
@ -948,8 +940,6 @@ static void __xfrm_state_insert(struct xfrm_state *x)
if (x->replay_maxage)
mod_timer(&x->rtimer, jiffies + x->replay_maxage);
wake_up(&net->xfrm.km_waitq);
net->xfrm.state_num++;
xfrm_hash_grow_check(net, x->bydst.next != NULL);
@ -1658,16 +1648,12 @@ EXPORT_SYMBOL(km_state_notify);
void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
{
struct net *net = xs_net(x);
struct km_event c;
c.data.hard = hard;
c.portid = portid;
c.event = XFRM_MSG_EXPIRE;
km_state_notify(x, &c);
if (hard)
wake_up(&net->xfrm.km_waitq);
}
EXPORT_SYMBOL(km_state_expired);
@ -1710,16 +1696,12 @@ EXPORT_SYMBOL(km_new_mapping);
void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
{
struct net *net = xp_net(pol);
struct km_event c;
c.data.hard = hard;
c.portid = portid;
c.event = XFRM_MSG_POLEXPIRE;
km_policy_notify(pol, dir, &c);
if (hard)
wake_up(&net->xfrm.km_waitq);
}
EXPORT_SYMBOL(km_policy_expired);
@ -2028,7 +2010,6 @@ int __net_init xfrm_state_init(struct net *net)
INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
init_waitqueue_head(&net->xfrm.km_waitq);
spin_lock_init(&net->xfrm.xfrm_state_lock);
return 0;