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xfrm: add and use xfrm_state_afinfo_get_rcu

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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>
This commit is contained in:
Florian Westphal 2017-01-09 14:20:48 +01:00 • committed by Steffen Klassert
parent af5d27c4e1
commit 711059b975
2 changed files with 16 additions and 10 deletions
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1
include/net/xfrm.h
View file

@ -343,6 +343,7 @@ struct xfrm_state_afinfo {
int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo); int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
int xfrm_state_unregister_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_get_afinfo(unsigned int family);
struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
struct xfrm_input_afinfo { struct xfrm_input_afinfo {
unsigned int family; unsigned int family;

25
net/xfrm/xfrm_state.c
View file

@ -639,26 +639,23 @@ void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
} }
EXPORT_SYMBOL(xfrm_sad_getinfo); EXPORT_SYMBOL(xfrm_sad_getinfo);
static int static void
xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl, xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
const struct xfrm_tmpl *tmpl, const struct xfrm_tmpl *tmpl,
const xfrm_address_t *daddr, const xfrm_address_t *saddr, const xfrm_address_t *daddr, const xfrm_address_t *saddr,
unsigned short family) unsigned short family)
{ {
struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family); struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family);
if (!afinfo)
return -1; if (afinfo)
afinfo->init_tempsel(&x->sel, fl); afinfo->init_tempsel(&x->sel, fl);
if (family != tmpl->encap_family) { if (family != tmpl->encap_family) {
rcu_read_unlock(); afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family);
afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
if (!afinfo) if (!afinfo)
return -1; return;
} }
afinfo->init_temprop(x, tmpl, daddr, saddr); afinfo->init_temprop(x, tmpl, daddr, saddr);
rcu_read_unlock();
return 0;
} }
static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark, 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); 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 *xfrm_state_get_afinfo(unsigned int family)
{ {
struct xfrm_state_afinfo *afinfo; struct xfrm_state_afinfo *afinfo;