const char * ll_type_n2a(int type, char *buf, int len);
const char *ll_addr_n2a(unsigned char *addr, int alen, int type, char *buf, int blen);
const char * ll_type_n2a(int type, char *buf, int len);
const char *ll_addr_n2a(unsigned char *addr, int alen, int type, char *buf, int blen);