size_t hash, const flow_t *);
static bool rules_match_1wild(const struct cls_rule *fixed,
const struct cls_rule *wild, int field_idx);
+static bool rules_match_2wild(const struct cls_rule *wild1,
+ const struct cls_rule *wild2, int field_idx);
/* Converts the flow in 'flow' into a cls_rule in 'rule', with the given
* 'wildcards' and 'priority'.*/
cls_rule_from_flow(struct cls_rule *rule, const flow_t *flow,
uint32_t wildcards, unsigned int priority)
{
+ assert(!flow->reserved[0] && !flow->reserved[1] && !flow->reserved[2]);
rule->flow = *flow;
flow_wildcards_init(&rule->wc, wildcards);
rule->priority = priority;
return NULL;
}
+/* Checks if the flow defined by 'target' with 'wildcards' at 'priority'
+ * overlaps with any other rule at the same priority in the classifier.
+ * Two rules are considered overlapping if a packet could match both. */
+bool
+classifier_rule_overlaps(const struct classifier *cls,
+ const flow_t *target, uint32_t wildcards,
+ unsigned int priority)
+{
+ struct cls_rule target_rule;
+ const struct hmap *tbl;
+
+ if (!wildcards) {
+ return search_exact_table(cls, flow_hash(target, 0), target) ?
+ true : false;
+ }
+
+ cls_rule_from_flow(&target_rule, target, wildcards, priority);
+
+ for (tbl = &cls->tables[0]; tbl < &cls->tables[CLS_N_FIELDS]; tbl++) {
+ struct cls_bucket *bucket;
+
+ HMAP_FOR_EACH (bucket, struct cls_bucket, hmap_node, tbl) {
+ struct cls_rule *rule;
+
+ LIST_FOR_EACH (rule, struct cls_rule, node.list,
+ &bucket->rules) {
+ if (rule->priority == priority
+ && rules_match_2wild(rule, &target_rule, 0)) {
+ return true;
+ }
+ }
+ }
+ }
+
+ return false;
+}
+
/* Ignores target->priority.
*
* 'callback' is allowed to delete the rule that is passed as its argument, but
wild->wc.nw_dst_mask, field_idx);
}
+/* Returns true if 'wild1' and 'wild2' match, that is, if their fields
+ * are equal modulo wildcards in 'wild1' or 'wild2'.
+ *
+ * 'field_idx' is the index of the first field to be compared; fields before
+ * 'field_idx' are assumed to match. Always returns true if 'field_idx' is
+ * CLS_N_FIELDS. */
+static bool
+rules_match_2wild(const struct cls_rule *wild1, const struct cls_rule *wild2,
+ int field_idx)
+{
+ return rules_match(wild1, wild2,
+ wild1->wc.wildcards | wild2->wc.wildcards,
+ wild1->wc.nw_src_mask & wild2->wc.nw_src_mask,
+ wild1->wc.nw_dst_mask & wild2->wc.nw_dst_mask,
+ field_idx);
+}
+
/* Searches 'bucket' for a rule that matches 'target'. Returns the
* highest-priority match, if one is found, or a null pointer if there is no
* match.