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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>
This commit is contained in:
Eric Dumazet 2015-12-08 07:22:01 -08:00 committed by David S. Miller
parent b0a8d1a0b6
commit 56f047305d
2 changed files with 10 additions and 2 deletions
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1
include/net/xfrm.h
View File

@ -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)

11
net/xfrm/xfrm_policy.c
View File

@ -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);