/*
- * Copyright (c) 2010, 2011, 2012 Nicira Networks.
+ * Copyright (c) 2010, 2011, 2012 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
fsr->out_port = fm.out_port;
fsr->table_id = fm.table_id;
}
+
+/* Parses a specification of a flow from 's' into 'flow'. 's' must take the
+ * form FIELD=VALUE[,FIELD=VALUE]... where each FIELD is the name of a
+ * mf_field. Fields must be specified in a natural order for satisfying
+ * prerequisites.
+ *
+ * Returns NULL on success, otherwise a malloc()'d string that explains the
+ * problem. */
+char *
+parse_ofp_exact_flow(struct flow *flow, const char *s)
+{
+ char *pos, *key, *value_s;
+ char *error = NULL;
+ char *copy;
+
+ memset(flow, 0, sizeof *flow);
+
+ pos = copy = xstrdup(s);
+ while (ofputil_parse_key_value(&pos, &key, &value_s)) {
+ const struct protocol *p;
+ if (parse_protocol(key, &p)) {
+ if (flow->dl_type) {
+ error = xasprintf("%s: Ethernet type set multiple times", s);
+ goto exit;
+ }
+ flow->dl_type = htons(p->dl_type);
+
+ if (p->nw_proto) {
+ if (flow->nw_proto) {
+ error = xasprintf("%s: network protocol set "
+ "multiple times", s);
+ goto exit;
+ }
+ flow->nw_proto = p->nw_proto;
+ }
+ } else {
+ const struct mf_field *mf;
+ union mf_value value;
+ char *field_error;
+
+ mf = mf_from_name(key);
+ if (!mf) {
+ error = xasprintf("%s: unknown field %s", s, key);
+ goto exit;
+ }
+
+ if (!mf_are_prereqs_ok(mf, flow)) {
+ error = xasprintf("%s: prerequisites not met for setting %s",
+ s, key);
+ goto exit;
+ }
+
+ if (!mf_is_zero(mf, flow)) {
+ error = xasprintf("%s: field %s set multiple times", s, key);
+ goto exit;
+ }
+
+ field_error = mf_parse_value(mf, value_s, &value);
+ if (field_error) {
+ error = xasprintf("%s: bad value for %s (%s)",
+ s, key, field_error);
+ free(field_error);
+ goto exit;
+ }
+
+ mf_set_flow_value(mf, &value, flow);
+ }
+ }
+
+exit:
+ free(copy);
+
+ if (error) {
+ memset(flow, 0, sizeof *flow);
+ }
+ return error;
+}