+struct ofputil_flow_mod_flag {
+ uint16_t raw_flag;
+ enum ofp_version min_version, max_version;
+ enum ofputil_flow_mod_flags flag;
+};
+
+static const struct ofputil_flow_mod_flag ofputil_flow_mod_flags[] = {
+ { OFPFF_SEND_FLOW_REM, OFP10_VERSION, 0, OFPUTIL_FF_SEND_FLOW_REM },
+ { OFPFF_CHECK_OVERLAP, OFP10_VERSION, 0, OFPUTIL_FF_CHECK_OVERLAP },
+ { OFPFF10_EMERG, OFP10_VERSION, OFP10_VERSION,
+ OFPUTIL_FF_EMERG },
+ { OFPFF12_RESET_COUNTS, OFP12_VERSION, 0, OFPUTIL_FF_RESET_COUNTS },
+ { OFPFF13_NO_PKT_COUNTS, OFP13_VERSION, 0, OFPUTIL_FF_NO_PKT_COUNTS },
+ { OFPFF13_NO_BYT_COUNTS, OFP13_VERSION, 0, OFPUTIL_FF_NO_BYT_COUNTS },
+ { 0, 0, 0, 0 },
+};
+
+static enum ofperr
+ofputil_decode_flow_mod_flags(ovs_be16 raw_flags_,
+ enum ofp_flow_mod_command command,
+ enum ofp_version version,
+ enum ofputil_flow_mod_flags *flagsp)
+{
+ uint16_t raw_flags = ntohs(raw_flags_);
+ const struct ofputil_flow_mod_flag *f;
+
+ *flagsp = 0;
+ for (f = ofputil_flow_mod_flags; f->raw_flag; f++) {
+ if (raw_flags & f->raw_flag
+ && version >= f->min_version
+ && (!f->max_version || version <= f->max_version)) {
+ raw_flags &= ~f->raw_flag;
+ *flagsp |= f->flag;
+ }
+ }
+
+ /* In OF1.0 and OF1.1, "add" always resets counters, and other commands
+ * never do.
+ *
+ * In OF1.2 and later, OFPFF12_RESET_COUNTS controls whether each command
+ * resets counters. */
+ if ((version == OFP10_VERSION || version == OFP11_VERSION)
+ && command == OFPFC_ADD) {
+ *flagsp |= OFPUTIL_FF_RESET_COUNTS;
+ }
+
+ return raw_flags ? OFPERR_OFPFMFC_BAD_FLAGS : 0;
+}
+
+static ovs_be16
+ofputil_encode_flow_mod_flags(enum ofputil_flow_mod_flags flags,
+ enum ofp_version version)
+{
+ const struct ofputil_flow_mod_flag *f;
+ uint16_t raw_flags;
+
+ raw_flags = 0;
+ for (f = ofputil_flow_mod_flags; f->raw_flag; f++) {
+ if (f->flag & flags
+ && version >= f->min_version
+ && (!f->max_version || version <= f->max_version)) {
+ raw_flags |= f->raw_flag;
+ }
+ }
+
+ return htons(raw_flags);
+}
+