lib: Add nexthop labels cmp functions

Add a function to compare nexthop labels.

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>

diff --git a/lib/nexthop.c b/lib/nexthop.c
index 2a65c4d54625f5327f4e29334c4675c540408421..c616ea857e1c5a80e66e7d75c365259c9562cfe7 100644 (file)
--- a/lib/nexthop.c
+++ b/lib/nexthop.c
@@ -36,6 +36,34 @@
 DEFINE_MTYPE_STATIC(LIB, NEXTHOP, "Nexthop")
 DEFINE_MTYPE_STATIC(LIB, NH_LABEL, "Nexthop label")
 
+static int nexthop_labels_cmp(const struct nexthop *nh1,
+                             const struct nexthop *nh2)
+{
+       const struct mpls_label_stack *nhl1 = NULL;
+       const struct mpls_label_stack *nhl2 = NULL;
+
+       nhl1 = nh1->nh_label;
+       nhl2 = nh2->nh_label;
+
+       /* No labels is a match */
+       if (!nhl1 && !nhl2)
+               return 0;
+
+       if (nhl1 && !nhl2)
+               return 1;
+
+       if (nhl2 && !nhl1)
+               return -1;
+
+       if (nhl1->num_labels > nhl2->num_labels)
+               return 1;
+
+       if (nhl1->num_labels < nhl2->num_labels)
+               return -1;
+
+       return memcmp(nhl1->label, nhl2->label, nhl1->num_labels);
+}
+
 int nexthop_cmp(const struct nexthop *next1, const struct nexthop *next2)
 {
        int ret;