lpm: check rule existence

[dpdk.git] / lib / librte_lpm / rte_lpm6.c

diff --git a/lib/librte_lpm/rte_lpm6.c b/lib/librte_lpm/rte_lpm6.c
index 56c74a1..32690cb 100644 (file)
--- a/lib/librte_lpm/rte_lpm6.c
+++ b/lib/librte_lpm/rte_lpm6.c
@@ -663,6 +663,37 @@ rule_find(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth)
        return -ENOENT;
 }
 
+/*
+ * Look for a rule in the high-level rules table
+ */
+int
+rte_lpm6_is_rule_present(struct rte_lpm6 *lpm, uint8_t *ip, uint8_t depth,
+uint8_t *next_hop)
+{
+       uint8_t ip_masked[RTE_LPM6_IPV6_ADDR_SIZE];
+       int32_t rule_index;
+
+       /* Check user arguments. */
+       if ((lpm == NULL) || next_hop == NULL || ip == NULL ||
+                       (depth < 1) || (depth > RTE_LPM6_MAX_DEPTH))
+               return -EINVAL;
+
+       /* Copy the IP and mask it to avoid modifying user's input data. */
+       memcpy(ip_masked, ip, RTE_LPM6_IPV6_ADDR_SIZE);
+       mask_ip(ip_masked, depth);
+
+       /* Look for the rule using rule_find. */
+       rule_index = rule_find(lpm, ip_masked, depth);
+
+       if (rule_index >= 0) {
+               *next_hop = lpm->rules_tbl[rule_index].next_hop;
+               return 1;
+       }
+
+       /* If rule is not found return 0. */
+       return 0;
+}
+
 /*
  * Delete a rule from the rule table.
  * NOTE: Valid range for depth parameter is 1 .. 128 inclusive.