odp-util: Include tun_id when nonzero even if "key" flag not set.

When a flow_tnl is being translated to Netlink attributes, the tun_id field
was included only if the FLOW_TNL_F_KEY flag was set.  This meant that for
a mask, where one would not necessarily expect that flag to be set even if
there were a key, the tun_id could be omitted even if it were nonzero.
This led to kernel flows that did not match on a field that was required
to be matched (possibly causing incorrect treatment of packets) and
premature deletion of kernel flows due to mask mismatch.  This commit
fixes the problem.

Bug #1192516.
Reported-by: Krishna Miriyala <miriyalak@vmware.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>

diff --git a/lib/odp-util.c b/lib/odp-util.c
index 18ad5c6..ff313c0 100644 (file)
--- a/lib/odp-util.c
+++ b/lib/odp-util.c
@@ -857,7 +857,8 @@ tun_key_to_attr(struct ofpbuf *a, const struct flow_tnl *tun_key)
 
     tun_key_ofs = nl_msg_start_nested(a, OVS_KEY_ATTR_TUNNEL);
 
-    if (tun_key->flags & FLOW_TNL_F_KEY) {
+    /* tun_id != 0 without FLOW_TNL_F_KEY is valid if tun_key is a mask. */
+    if (tun_key->tun_id || tun_key->flags & FLOW_TNL_F_KEY) {
         nl_msg_put_be64(a, OVS_TUNNEL_KEY_ATTR_ID, tun_key->tun_id);
     }
     if (tun_key->ip_src) {