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Revert "xfrm: destroy xfrm_state synchronously on net exit path"

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This reverts commit f75a2804da.

With all states (whether user or kern) removed from the hashtables
during deletion, there's no need for synchronous destruction of
states. xfrm6_tunnel states still need to have been destroyed (which
will be the case when its last user is deleted (not destroyed)) so
that xfrm6_tunnel_free_spi removes it from the per-netns hashtable
before the netns is destroyed.

This has the benefit of skipping one synchronize_rcu per state (in
__xfrm_state_destroy(sync=true)) when we exit a netns.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Sabrina Dubroca 2025-07-04 16:54:34 +02:00 • committed by Steffen Klassert
parent b441cf3f8c
commit 2a198bbec6
5 changed files with 15 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

12
include/net/xfrm.h
View file

@ -915,7 +915,7 @@ static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
xfrm_pol_put(pols[i]);
}
void __xfrm_state_destroy(struct xfrm_state *, bool);
void __xfrm_state_destroy(struct xfrm_state *);
static inline void __xfrm_state_put(struct xfrm_state *x)
{
@ -925,13 +925,7 @@ static inline void __xfrm_state_put(struct xfrm_state *x)
static inline void xfrm_state_put(struct xfrm_state *x)
{
if (refcount_dec_and_test(&x->refcnt))
__xfrm_state_destroy(x, false);
}
static inline void xfrm_state_put_sync(struct xfrm_state *x)
{
if (refcount_dec_and_test(&x->refcnt))
__xfrm_state_destroy(x, true);
__xfrm_state_destroy(x);
}
static inline void xfrm_state_hold(struct xfrm_state *x)
@ -1769,7 +1763,7 @@ struct xfrmk_spdinfo {
struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq, u32 pcpu_num);
int xfrm_state_delete(struct xfrm_state *x);
int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync);
int xfrm_state_flush(struct net *net, u8 proto, bool task_valid);
int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid);
int xfrm_dev_policy_flush(struct net *net, struct net_device *dev,
bool task_valid);

2
net/ipv6/xfrm6_tunnel.c
View file

@ -334,7 +334,7 @@ static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
unsigned int i;
xfrm_state_flush(net, 0, false, true);
xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
xfrm_flush_gc();
for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)

2
net/key/af_key.c
View file

@ -1766,7 +1766,7 @@ static int pfkey_flush(struct sock *sk, struct sk_buff *skb, const struct sadb_m
if (proto == 0)
return -EINVAL;
err = xfrm_state_flush(net, proto, true, false);
err = xfrm_state_flush(net, proto, true);
err2 = unicast_flush_resp(sk, hdr);
if (err || err2) {
if (err == -ESRCH) /* empty table - go quietly */

15
net/xfrm/xfrm_state.c
View file

@ -592,7 +592,7 @@ void xfrm_state_free(struct xfrm_state *x)
}
EXPORT_SYMBOL(xfrm_state_free);
static void ___xfrm_state_destroy(struct xfrm_state *x)
static void xfrm_state_gc_destroy(struct xfrm_state *x)
{
if (x->mode_cbs && x->mode_cbs->destroy_state)
x->mode_cbs->destroy_state(x);
@ -631,7 +631,7 @@ static void xfrm_state_gc_task(struct work_struct *work)
synchronize_rcu();
hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
___xfrm_state_destroy(x);
xfrm_state_gc_destroy(x);
}
static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
@ -795,20 +795,15 @@ void xfrm_dev_state_free(struct xfrm_state *x)
}
#endif
void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
void __xfrm_state_destroy(struct xfrm_state *x)
{
WARN_ON(x->km.state != XFRM_STATE_DEAD);
if (sync) {
synchronize_rcu();
___xfrm_state_destroy(x);
} else {
spin_lock_bh(&xfrm_state_gc_lock);
hlist_add_head(&x->gclist, &xfrm_state_gc_list);
spin_unlock_bh(&xfrm_state_gc_lock);
schedule_work(&xfrm_state_gc_work);
}
}
EXPORT_SYMBOL(__xfrm_state_destroy);
static void xfrm_state_delete_tunnel(struct xfrm_state *x);
@ -922,7 +917,7 @@ xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool
}
#endif
int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
int xfrm_state_flush(struct net *net, u8 proto, bool task_valid)
{
int i, err = 0, cnt = 0;
@ -3283,7 +3278,7 @@ void xfrm_state_fini(struct net *net)
unsigned int sz;
flush_work(&net->xfrm.state_hash_work);
xfrm_state_flush(net, 0, false, true);
xfrm_state_flush(net, IPSEC_PROTO_ANY, false);
flush_work(&xfrm_state_gc_work);
WARN_ON(!list_empty(&net->xfrm.state_all));

2
net/xfrm/xfrm_user.c
View file

@ -2635,7 +2635,7 @@ static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
struct xfrm_usersa_flush *p = nlmsg_data(nlh);
int err;
err = xfrm_state_flush(net, p->proto, true, false);
err = xfrm_state_flush(net, p->proto, true);
if (err) {
if (err == -ESRCH) /* empty table */
return 0;