xfrm: add and use xfrm_state_afinfo_get_rcu
xfrm_init_tempstate is always called from within rcu read side section.
We can thus use a simpler function that doesn't call rcu_read_lock
again.
While at it, also make xfrm_init_tempstate return value void, the
return value was never tested.
A followup patch will replace remaining callers of xfrm_state_get_afinfo
with xfrm_state_afinfo_get_rcu variant and then remove the 'old'
get_afinfo interface.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 7830844..b5dad899 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -639,26 +639,23 @@ void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
}
EXPORT_SYMBOL(xfrm_sad_getinfo);
-static int
+static void
xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
const struct xfrm_tmpl *tmpl,
const xfrm_address_t *daddr, const xfrm_address_t *saddr,
unsigned short family)
{
- struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
- if (!afinfo)
- return -1;
- afinfo->init_tempsel(&x->sel, fl);
+ struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family);
+
+ if (afinfo)
+ afinfo->init_tempsel(&x->sel, fl);
if (family != tmpl->encap_family) {
- rcu_read_unlock();
- afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
+ afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family);
if (!afinfo)
- return -1;
+ return;
}
afinfo->init_temprop(x, tmpl, daddr, saddr);
- rcu_read_unlock();
- return 0;
}
static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
@@ -1966,6 +1963,14 @@ int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
}
EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
+struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
+{
+ if (unlikely(family >= NPROTO))
+ return NULL;
+
+ return rcu_dereference(xfrm_state_afinfo[family]);
+}
+
struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
{
struct xfrm_state_afinfo *afinfo;
