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authorFlorian Westphal <fw@strlen.de>2017-02-07 14:52:30 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2017-02-09 10:22:17 +0100
commit960fdfdeb9e85a67bed136bc945c541ba61c2bdd (patch)
treeb0f0894a34a442965d33f4374586c40fabdcf99e /net/xfrm/xfrm_input.c
parentMerge branch 'bridge-improve-cache-utilization' (diff)
downloadlinux-dev-960fdfdeb9e85a67bed136bc945c541ba61c2bdd.tar.xz
linux-dev-960fdfdeb9e85a67bed136bc945c541ba61c2bdd.zip
xfrm: input: constify xfrm_input_afinfo
Nothing writes to these structures (the module owner was not used). While at it, size xfrm_input_afinfo[] by the highest existing xfrm family (INET6), not AF_MAX. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm/xfrm_input.c')
-rw-r--r--net/xfrm/xfrm_input.c31
1 files changed, 11 insertions, 20 deletions
diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 3213fe8027be..8722294c6e59 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -19,19 +19,18 @@
static struct kmem_cache *secpath_cachep __read_mostly;
static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
-static struct xfrm_input_afinfo __rcu *xfrm_input_afinfo[NPROTO];
+static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
static struct gro_cells gro_cells;
static struct net_device xfrm_napi_dev;
-int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo)
+int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
{
int err = 0;
- if (unlikely(afinfo == NULL))
- return -EINVAL;
- if (unlikely(afinfo->family >= NPROTO))
+ if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
return -EAFNOSUPPORT;
+
spin_lock_bh(&xfrm_input_afinfo_lock);
if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
err = -EEXIST;
@@ -42,14 +41,10 @@ int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo)
}
EXPORT_SYMBOL(xfrm_input_register_afinfo);
-int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo)
+int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
{
int err = 0;
- if (unlikely(afinfo == NULL))
- return -EINVAL;
- if (unlikely(afinfo->family >= NPROTO))
- return -EAFNOSUPPORT;
spin_lock_bh(&xfrm_input_afinfo_lock);
if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
@@ -63,12 +58,13 @@ int xfrm_input_unregister_afinfo(struct xfrm_input_afinfo *afinfo)
}
EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
-static struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
+static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
{
- struct xfrm_input_afinfo *afinfo;
+ const struct xfrm_input_afinfo *afinfo;
- if (unlikely(family >= NPROTO))
+ if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
return NULL;
+
rcu_read_lock();
afinfo = rcu_dereference(xfrm_input_afinfo[family]);
if (unlikely(!afinfo))
@@ -76,22 +72,17 @@ static struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
return afinfo;
}
-static void xfrm_input_put_afinfo(struct xfrm_input_afinfo *afinfo)
-{
- rcu_read_unlock();
-}
-
static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
int err)
{
int ret;
- struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
+ const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
if (!afinfo)
return -EAFNOSUPPORT;
ret = afinfo->callback(skb, protocol, err);
- xfrm_input_put_afinfo(afinfo);
+ rcu_read_unlock();
return ret;
}