diff options
| author | Eric Dumazet <edumazet@google.com> | 2015-12-08 15:22:01 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-12-12 00:22:06 (GMT) |
| commit | 56f047305dd4b6b61771ac4f523718e4111052a8 (patch) | |
| tree | 05de0e01553b3040c009048ee446b849a3f697e1 | |
| parent | b0a8d1a0b6e569b7dd14322ca2df4d576f325908 (diff) | |
| download | linux-56f047305dd4b6b61771ac4f523718e4111052a8.tar.xz | |
xfrm: add rcu grace period in xfrm_policy_destroy()
We will soon switch sk->sk_policy[] to RCU protection,
as SYNACK packets are sent while listener socket is not locked.
This patch simply adds RCU grace period before struct xfrm_policy
freeing, and the corresponding rcu_head in struct xfrm_policy.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/net/xfrm.h | 1 | ||||
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 11 |
2 files changed, 10 insertions, 2 deletions
diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 4a9c21f..8bae1ef 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -548,6 +548,7 @@ struct xfrm_policy { u16 family; struct xfrm_sec_ctx *security; struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH]; + struct rcu_head rcu; }; static inline struct net *xp_net(const struct xfrm_policy *xp) diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 18276f0..f57a571 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -303,6 +303,14 @@ struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp) } EXPORT_SYMBOL(xfrm_policy_alloc); +static void xfrm_policy_destroy_rcu(struct rcu_head *head) +{ + struct xfrm_policy *policy = container_of(head, struct xfrm_policy, rcu); + + security_xfrm_policy_free(policy->security); + kfree(policy); +} + /* Destroy xfrm_policy: descendant resources must be released to this moment. */ void xfrm_policy_destroy(struct xfrm_policy *policy) @@ -312,8 +320,7 @@ void xfrm_policy_destroy(struct xfrm_policy *policy) if (del_timer(&policy->timer) || del_timer(&policy->polq.hold_timer)) BUG(); - security_xfrm_policy_free(policy->security); - kfree(policy); + call_rcu(&policy->rcu, xfrm_policy_destroy_rcu); } EXPORT_SYMBOL(xfrm_policy_destroy); |