[XFRM]: Add sorting interface for state and template.

Under two transformation policies it is required to merge them.
This is a platform to sort state for outbound and templates
for inbound respectively.
It will be used when Mobile IPv6 and IPsec are used at the same time.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index a26ef6952c30..622e92a08d0b 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -728,6 +728,44 @@ xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
 }
 EXPORT_SYMBOL(xfrm_find_acq);
 
+#ifdef CONFIG_XFRM_SUB_POLICY
+int
+xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
+               unsigned short family)
+{
+        int err = 0;
+        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
+        if (!afinfo)
+                return -EAFNOSUPPORT;
+
+        spin_lock_bh(&xfrm_state_lock);
+        if (afinfo->tmpl_sort)
+                err = afinfo->tmpl_sort(dst, src, n);
+        spin_unlock_bh(&xfrm_state_lock);
+        xfrm_state_put_afinfo(afinfo);
+        return err;
+}
+EXPORT_SYMBOL(xfrm_tmpl_sort);
+
+int
+xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
+                unsigned short family)
+{
+        int err = 0;
+        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
+        if (!afinfo)
+                return -EAFNOSUPPORT;
+
+        spin_lock_bh(&xfrm_state_lock);
+        if (afinfo->state_sort)
+                err = afinfo->state_sort(dst, src, n);
+        spin_unlock_bh(&xfrm_state_lock);
+        xfrm_state_put_afinfo(afinfo);
+        return err;
+}
+EXPORT_SYMBOL(xfrm_state_sort);
+#endif
+
 /* Silly enough, but I'm lazy to build resolution list */
 
 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq)