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Commit 50a30657 authored by Alexey Dobriyan's avatar Alexey Dobriyan Committed by David S. Miller
Browse files

netns xfrm: per-netns km_waitq 



Disallow spurious wakeups in __xfrm_lookup().

Signed-off-by: default avatarAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c7837144

include/net/netns/xfrm.h

+3 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#define __NETNS_XFRM_H



#include <linux/list.h>

#include <linux/wait.h>

#include <linux/workqueue.h>



struct netns_xfrm {
@@ -22,6 +23,8 @@ struct netns_xfrm { 
	struct work_struct	state_hash_work;

	struct hlist_head	state_gc_list;

	struct work_struct	state_gc_work;



	wait_queue_head_t	km_waitq;

};



#endif

include/net/xfrm.h

+0 −1
Original line number Diff line number Diff line
@@ -1459,7 +1459,6 @@ extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type, 
			struct xfrm_kmaddress *k);

#endif



extern wait_queue_head_t km_waitq;

extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);

extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);

extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);

net/key/af_key.c

+1 −1
Original line number Diff line number Diff line
@@ -1411,7 +1411,7 @@ static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg * 
	spin_lock_bh(&x->lock);

	if (x->km.state == XFRM_STATE_ACQ) {

		x->km.state = XFRM_STATE_ERROR;

		wake_up(&km_waitq);

		wake_up(&init_net.xfrm.km_waitq);

	}

	spin_unlock_bh(&x->lock);

	xfrm_state_put(x);

net/xfrm/xfrm_policy.c

+2 −2
Original line number Diff line number Diff line
@@ -1691,11 +1691,11 @@ int __xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl, 
			if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) {

				DECLARE_WAITQUEUE(wait, current);



				add_wait_queue(&km_waitq, &wait);

				add_wait_queue(&init_net.xfrm.km_waitq, &wait);

				set_current_state(TASK_INTERRUPTIBLE);

				schedule();

				set_current_state(TASK_RUNNING);

				remove_wait_queue(&km_waitq, &wait);

				remove_wait_queue(&init_net.xfrm.km_waitq, &wait);



				nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);

net/xfrm/xfrm_state.c

+7 −9
Original line number Diff line number Diff line
@@ -170,9 +170,6 @@ static void xfrm_hash_resize(struct work_struct *work) 
	mutex_unlock(&hash_resize_mutex);

}



DECLARE_WAIT_QUEUE_HEAD(km_waitq);

EXPORT_SYMBOL(km_waitq);



static DEFINE_RWLOCK(xfrm_state_afinfo_lock);

static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
@@ -399,7 +396,7 @@ static void xfrm_state_gc_task(struct work_struct *work) 
	hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)

		xfrm_state_gc_destroy(x);



	wake_up(&km_waitq);

	wake_up(&net->xfrm.km_waitq);

}



static inline unsigned long make_jiffies(long secs)
@@ -470,7 +467,7 @@ static void xfrm_timer_handler(unsigned long data) 
expired:

	if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {

		x->km.state = XFRM_STATE_EXPIRED;

		wake_up(&km_waitq);

		wake_up(&init_net.xfrm.km_waitq);

		next = 2;

		goto resched;

	}
@@ -638,7 +635,7 @@ int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info) 


out:

	spin_unlock_bh(&xfrm_state_lock);

	wake_up(&km_waitq);

	wake_up(&init_net.xfrm.km_waitq);

	return err;

}

EXPORT_SYMBOL(xfrm_state_flush);
@@ -929,7 +926,7 @@ static void __xfrm_state_insert(struct xfrm_state *x) 
	if (x->replay_maxage)

		mod_timer(&x->rtimer, jiffies + x->replay_maxage);



	wake_up(&km_waitq);

	wake_up(&init_net.xfrm.km_waitq);



	init_net.xfrm.state_num++;
@@ -1743,7 +1740,7 @@ void km_state_expired(struct xfrm_state *x, int hard, u32 pid) 
	km_state_notify(x, &c);



	if (hard)

		wake_up(&km_waitq);

		wake_up(&init_net.xfrm.km_waitq);

}



EXPORT_SYMBOL(km_state_expired);
@@ -1794,7 +1791,7 @@ void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid) 
	km_policy_notify(pol, dir, &c);



	if (hard)

		wake_up(&km_waitq);

		wake_up(&init_net.xfrm.km_waitq);

}

EXPORT_SYMBOL(km_policy_expired);
@@ -2089,6 +2086,7 @@ 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);

	return 0;



out_byspi: