Commit 711059b9 authored by Florian Westphal's avatar Florian Westphal Committed by Steffen Klassert

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: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent af5d27c4
......@@ -343,6 +343,7 @@ struct xfrm_state_afinfo {
int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
struct xfrm_input_afinfo {
unsigned int family;
......
......@@ -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;
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;
......
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