[IPSEC] Fix xfrm to pfkey SA state conversion

This patch adjusts the SA state conversion in af_key such that
XFRM_STATE_ERROR/XFRM_STATE_DEAD will be converted to SADB_STATE_DEAD
instead of SADB_STATE_DYING.

According to RFC 2367, SADB_STATE_DYING SAs can be turned into
mature ones through updating their lifetime settings.  Since SAs
which are in the states XFRM_STATE_ERROR/XFRM_STATE_DEAD cannot
be resurrected, this value is unsuitable.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 10 insertions, 5 deletions

diff --git a/net/key/af_key.c b/net/key/af_key.c
index d086c117f5f0..560c93c10890 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -656,13 +656,18 @@ static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys,
         sa->sadb_sa_exttype = SADB_EXT_SA;
         sa->sadb_sa_spi = x->id.spi;
         sa->sadb_sa_replay = x->props.replay_window;
-        sa->sadb_sa_state = SADB_SASTATE_DYING;
-        if (x->km.state == XFRM_STATE_VALID && !x->km.dying)
-                sa->sadb_sa_state = SADB_SASTATE_MATURE;
-        else if (x->km.state == XFRM_STATE_ACQ)
+        switch (x->km.state) {
+        case XFRM_STATE_VALID:
+                sa->sadb_sa_state = x->km.dying ?
+                        SADB_SASTATE_DYING : SADB_SASTATE_MATURE;
+                break;
+        case XFRM_STATE_ACQ:
                 sa->sadb_sa_state = SADB_SASTATE_LARVAL;
-        else if (x->km.state == XFRM_STATE_EXPIRED)
+                break;
+        default:
                 sa->sadb_sa_state = SADB_SASTATE_DEAD;
+                break;
+        }
         sa->sadb_sa_auth = 0;
         if (x->aalg) {
                 struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0);