int sd_rtnl_message_new_route(sd_netlink *nl, sd_netlink_message **ret, uint16_t nlmsg_type, int rtm_family, unsigned char rtm_protocol);
int sd_rtnl_message_new_neigh(sd_netlink *nl, sd_netlink_message **ret, uint16_t msg_type, int index, int nda_family);
int sd_rtnl_message_new_route(sd_netlink *nl, sd_netlink_message **ret, uint16_t nlmsg_type, int rtm_family, unsigned char rtm_protocol);
int sd_rtnl_message_new_neigh(sd_netlink *nl, sd_netlink_message **ret, uint16_t msg_type, int index, int nda_family);