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authorHerbert Xu <herbert@gondor.apana.org.au>2007-10-17 21:33:12 -0700
committerDavid S. Miller <davem@davemloft.net>2007-10-17 21:33:12 -0700
commit17c2a42a24e1e8dd6aa7cea4f84e034ab1bfff31 (patch)
tree3ee494a16a43f575f8c4900deaab894b73b2953a /net/xfrm
parent1bfcb10f670f5ff5e1d9f53e59680573524cb142 (diff)
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[IPSEC]: Store afinfo pointer in xfrm_mode
It is convenient to have a pointer from xfrm_state to address-specific functions such as the output function for a family. Currently the address-specific policy code calls out to the xfrm state code to get those pointers when we could get it in an easier way via the state itself. This patch adds an xfrm_state_afinfo to xfrm_mode (since they're address-specific) and changes the policy code to use it. I've also added an owner field to do reference counting on the module providing the afinfo even though it isn't strictly necessary today since IPv6 can't be unloaded yet. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm')
-rw-r--r--net/xfrm/xfrm_state.c26
1 files changed, 17 insertions, 9 deletions
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index dc438f2..48b4a06 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -57,6 +57,9 @@ static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
static unsigned int xfrm_state_num;
static unsigned int xfrm_state_genid;
+static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
+static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
+
static inline unsigned int xfrm_dst_hash(xfrm_address_t *daddr,
xfrm_address_t *saddr,
u32 reqid,
@@ -289,11 +292,18 @@ int xfrm_register_mode(struct xfrm_mode *mode, int family)
err = -EEXIST;
modemap = afinfo->mode_map;
- if (likely(modemap[mode->encap] == NULL)) {
- modemap[mode->encap] = mode;
- err = 0;
- }
+ if (modemap[mode->encap])
+ goto out;
+ err = -ENOENT;
+ if (!try_module_get(afinfo->owner))
+ goto out;
+
+ mode->afinfo = afinfo;
+ modemap[mode->encap] = mode;
+ err = 0;
+
+out:
xfrm_state_unlock_afinfo(afinfo);
return err;
}
@@ -316,6 +326,7 @@ int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
modemap = afinfo->mode_map;
if (likely(modemap[mode->encap] == mode)) {
modemap[mode->encap] = NULL;
+ module_put(mode->afinfo->owner);
err = 0;
}
@@ -1869,7 +1880,7 @@ int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
}
EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
-struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family)
+static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
{
struct xfrm_state_afinfo *afinfo;
if (unlikely(family >= NPROTO))
@@ -1881,14 +1892,11 @@ struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned short family)
return afinfo;
}
-void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
+static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
{
read_unlock(&xfrm_state_afinfo_lock);
}
-EXPORT_SYMBOL(xfrm_state_get_afinfo);
-EXPORT_SYMBOL(xfrm_state_put_afinfo);
-
/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
void xfrm_state_delete_tunnel(struct xfrm_state *x)
{