{pktgen, xfrm} Introduce xfrm_state_lookup_byspi for pktgen

Introduce xfrm_state_lookup_byspi to find user specified by custom
from "pgset spi xxx". Using this scheme, any flow regardless its
saddr/daddr could be transform by SA specified with configurable
spi.

Signed-off-by: Fan Du <fan.du@windriver.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 300744094ad8..62181486ead8 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -915,6 +915,28 @@ xfrm_stateonly_find(struct net *net, u32 mark,
 }
 EXPORT_SYMBOL(xfrm_stateonly_find);
 
+struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
+                                              unsigned short family)
+{
+        struct xfrm_state *x;
+        struct xfrm_state_walk *w;
+
+        spin_lock_bh(&net->xfrm.xfrm_state_lock);
+        list_for_each_entry(w, &net->xfrm.state_all, all) {
+                x = container_of(w, struct xfrm_state, km);
+                if (x->props.family != family ||
+                        x->id.spi != spi)
+                        continue;
+
+                spin_unlock_bh(&net->xfrm.xfrm_state_lock);
+                xfrm_state_hold(x);
+                return x;
+        }
+        spin_unlock_bh(&net->xfrm.xfrm_state_lock);
+        return NULL;
+}
+EXPORT_SYMBOL(xfrm_state_lookup_byspi);
+
 static void __xfrm_state_insert(struct xfrm_state *x)
 {
         struct net *net = xs_net(x);