+int message_new_synthetic_error(int error, uint32_t serial, sd_rtnl_message **ret) {
+ struct nlmsgerr *err;
+ int r;
+
+ assert(error <= 0);
+
+ r = message_new(ret, NLMSG_SPACE(sizeof(struct nlmsgerr)));
+ if (r < 0)
+ return r;
+
+ (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct nlmsgerr));
+ (*ret)->hdr->nlmsg_type = NLMSG_ERROR;
+ (*ret)->hdr->nlmsg_seq = serial;
+
+ err = NLMSG_DATA((*ret)->hdr);
+
+ err->error = error;
+
+ return 0;
+}
+
+bool message_type_is_route(uint16_t type) {
+ switch (type) {
+ case RTM_NEWROUTE:
+ case RTM_GETROUTE:
+ case RTM_DELROUTE:
+ return true;
+ default:
+ return false;
+ }
+}
+
+bool message_type_is_link(uint16_t type) {
+ switch (type) {
+ case RTM_NEWLINK:
+ case RTM_SETLINK:
+ case RTM_GETLINK:
+ case RTM_DELLINK:
+ return true;
+ default:
+ return false;
+ }
+}
+
+bool message_type_is_addr(uint16_t type) {
+ switch (type) {
+ case RTM_NEWADDR:
+ case RTM_GETADDR:
+ case RTM_DELADDR:
+ return true;
+ default:
+ return false;
+ }
+}
+
+int sd_rtnl_message_route_set_dst_prefixlen(sd_rtnl_message *m, unsigned char prefixlen) {
+ struct rtmsg *rtm;
+
+ rtm = NLMSG_DATA(m->hdr);
+
+ rtm->rtm_dst_len = prefixlen;
+
+ return 0;
+}
+
+int sd_rtnl_message_route_new(uint16_t nlmsg_type, unsigned char rtm_family,
+ sd_rtnl_message **ret) {
+ struct rtmsg *rtm;
+ int r;
+
+ assert_return(message_type_is_route(nlmsg_type), -EINVAL);
+ assert_return(rtm_family == AF_INET || rtm_family == AF_INET6, -EINVAL);
+ assert_return(ret, -EINVAL);
+
+ r = message_new(ret, NLMSG_SPACE(sizeof(struct rtmsg)));
+ if (r < 0)
+ return r;
+
+ (*ret)->hdr->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
+ (*ret)->hdr->nlmsg_type = nlmsg_type;
+ if (nlmsg_type == RTM_NEWROUTE)
+ (*ret)->hdr->nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+
+ rtm = NLMSG_DATA((*ret)->hdr);
+
+ UPDATE_RTA(*ret, RTM_RTA(rtm));
+
+ rtm->rtm_family = rtm_family;
+ rtm->rtm_scope = RT_SCOPE_UNIVERSE;
+ rtm->rtm_type = RTN_UNICAST;
+ rtm->rtm_table = RT_TABLE_MAIN;
+ rtm->rtm_protocol = RTPROT_BOOT;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_set_flags(sd_rtnl_message *m, unsigned flags) {
+ struct ifinfomsg *ifi;
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ ifi->ifi_flags = flags;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_set_type(sd_rtnl_message *m, unsigned type) {
+ struct ifinfomsg *ifi;
+
+ ifi = NLMSG_DATA(m->hdr);
+
+ ifi->ifi_type = type;
+
+ return 0;
+}
+
+int sd_rtnl_message_link_new(uint16_t nlmsg_type, int index, sd_rtnl_message **ret) {