[ovs-dev] [PATCH v3 1/4] nx-match: Fix oxm decode.

[Yi-Hung Wei]

decode_nx_packet_in2() may be used by the switch to parse NXT_RESUME messages,
where we need exact match on the oxm header. Therefore, change
oxm_decode_loose() to oxm_decode() that takes an extra argument to indicate whether
we want strict or loose match.

Fixes: 7befb20d0f70 ("ofp-util: Ignore unknown fields in ofputil_decode_packet_in2()")
Signed-off-by: Yi-Hung Wei <yihung.wei at gmail.com>
---
 lib/nx-match.c | 10 +++++-----
 lib/nx-match.h |  4 ++--
 lib/ofp-util.c |  5 ++---
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/lib/nx-match.c b/lib/nx-match.c
index 35a312f0e094..df7d6238a1b3 100644
--- a/lib/nx-match.c
+++ b/lib/nx-match.c
@@ -683,14 +683,14 @@ oxm_pull_match_loose(struct ofpbuf *b, const struct tun_table *tun_table,
  *
  * Returns 0 if successful, otherwise an OpenFlow error code.
  *
- * Encountering unknown OXM headers or missing field prerequisites are not
- * considered as error conditions.
+ * If 'loose' is true, encountering unknown OXM headers or missing field
+ * prerequisites are not considered as error conditions.
  */
 enum ofperr
-oxm_decode_match_loose(const void *oxm, size_t oxm_len,
-                       const struct tun_table *tun_table, struct match *match)
+oxm_decode_match(const void *oxm, size_t oxm_len, bool loose,
+                 const struct tun_table *tun_table, struct match *match)
 {
-    return nx_pull_raw(oxm, oxm_len, false, match, NULL, NULL, tun_table);
+    return nx_pull_raw(oxm, oxm_len, !loose, match, NULL, NULL, tun_table);
 }
 
 /* Verify an array of OXM TLVs treating value of each TLV as a mask,
diff --git a/lib/nx-match.h b/lib/nx-match.h
index b599731f1472..8d0229097d15 100644
--- a/lib/nx-match.h
+++ b/lib/nx-match.h
@@ -61,8 +61,8 @@ enum ofperr oxm_pull_match(struct ofpbuf *, const struct tun_table *,
                            struct match *);
 enum ofperr oxm_pull_match_loose(struct ofpbuf *, const struct tun_table *,
                                  struct match *);
-enum ofperr oxm_decode_match_loose(const void *, size_t,
-                                   const struct tun_table *, struct match *);
+enum ofperr oxm_decode_match(const void *, size_t, bool,
+                             const struct tun_table *, struct match *);
 enum ofperr oxm_pull_field_array(const void *, size_t fields_len,
                                  struct field_array *);
 
diff --git a/lib/ofp-util.c b/lib/ofp-util.c
index 78814806d5e7..83ade9973668 100644
--- a/lib/ofp-util.c
+++ b/lib/ofp-util.c
@@ -3397,9 +3397,8 @@ decode_nx_packet_in2(const struct ofp_header *oh, bool loose,
         }
 
         case NXPINT_METADATA:
-            error = oxm_decode_match_loose(payload.msg,
-                                           ofpbuf_msgsize(&payload),
-                                           tun_table, &pin->flow_metadata);
+            error = oxm_decode_match(payload.msg, ofpbuf_msgsize(&payload),
+                                     loose, tun_table, &pin->flow_metadata);
             break;
 
         case NXPINT_USERDATA:
-- 
2.7.4