bool smap_add_once(struct smap *, const char *, const char *);
void smap_add_format(struct smap *, const char *key, const char *, ...)
OVS_PRINTF_FORMAT(3, 4);
+void smap_add_ipv6(struct smap *, const char *, struct in6_addr *);
void smap_replace(struct smap *, const char *, const char *);
void smap_remove(struct smap *, const char *);