[ovs-dev] [PATCH 09/12] ofproto: Do not add flow on flow mod if new_cookie is UINT64_MAX

[Simon Horman]

Internally a new_cookie value UINT64_MAX is used for
an OpenFlow 1.2 flow mod whose command is not Add.
Open Flow 1.2 does not permit adding flows for such commands.
Also, UINT64_MAX is a prohibited cookie value, and the
existing code created a flow with that value as for the cookie.

Signed-off-by: Simon Horman <horms at verge.net.au>

---

v13
* Fix logic error in modify_flows_add.
  - Zero should be returned if fm->cookie_mask is non-zero.
* Fix endienness issues in modify_flows_add()

v12
* No change

v11
* Initial post
---
 ofproto/ofproto.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/ofproto/ofproto.c b/ofproto/ofproto.c
index 06a394c..1f1cd60 100644
--- a/ofproto/ofproto.c
+++ b/ofproto/ofproto.c
@@ -3129,6 +3129,17 @@ modify_flows__(struct ofproto *ofproto, struct ofconn *ofconn,
     return error;
 }
 
+static enum ofperr
+modify_flows_add(struct ofproto *ofproto, struct ofconn *ofconn,
+                 const struct ofputil_flow_mod *fm,
+                 const struct ofp_header *request)
+{
+    if (fm->cookie_mask != htonll(0) || fm->new_cookie == htonll(UINT64_MAX)) {
+        return 0;
+    }
+    return add_flow(ofproto, ofconn, fm, request);
+}
+
 /* Implements OFPFC_MODIFY.  Returns 0 on success or an OpenFlow error code on
  * failure.
  *
@@ -3148,7 +3159,7 @@ modify_flows_loose(struct ofproto *ofproto, struct ofconn *ofconn,
     if (error) {
         return error;
     } else if (list_is_empty(&rules)) {
-        return fm->cookie_mask ? 0 : add_flow(ofproto, ofconn, fm, request);
+        return modify_flows_add(ofproto, ofconn, fm, request);
     } else {
         return modify_flows__(ofproto, ofconn, fm, request, &rules);
     }
@@ -3174,7 +3185,7 @@ modify_flow_strict(struct ofproto *ofproto, struct ofconn *ofconn,
     if (error) {
         return error;
     } else if (list_is_empty(&rules)) {
-        return fm->cookie_mask ? 0 : add_flow(ofproto, ofconn, fm, request);
+        return modify_flows_add(ofproto, ofconn, fm, request);
     } else {
         return list_is_singleton(&rules) ? modify_flows__(ofproto, ofconn,
                                                           fm, request, &rules)
-- 
1.7.10.4