int sd_rtnl_message_open_container(sd_rtnl_message *m, unsigned short type);
int sd_rtnl_message_close_container(sd_rtnl_message *m);
-int sd_rtnl_message_read(sd_rtnl_message *m, unsigned short *type, void **data);
int sd_rtnl_message_read_string(sd_rtnl_message *m, unsigned short type, char **data);
int sd_rtnl_message_read_u8(sd_rtnl_message *m, unsigned short type, uint8_t *data);
int sd_rtnl_message_read_u16(sd_rtnl_message *m, unsigned short type, uint16_t *data);
int sd_rtnl_message_read_ether_addr(sd_rtnl_message *m, unsigned short type, struct ether_addr *data);
int sd_rtnl_message_read_in_addr(sd_rtnl_message *m, unsigned short type, struct in_addr *data);
int sd_rtnl_message_read_in6_addr(sd_rtnl_message *m, unsigned short type, struct in6_addr *data);
+int sd_rtnl_message_enter_container(sd_rtnl_message *m, unsigned short type);
int sd_rtnl_message_exit_container(sd_rtnl_message *m);
int sd_rtnl_message_rewind(sd_rtnl_message *m);