+static void rtnl_rule_request(struct relayd_interface *rif, bool add)
+{
+ static struct {
+ struct nlmsghdr nl;
+ struct rtmsg rt;
+ struct {
+ struct rtattr rta;
+ int table;
+ } __packed table;
+ struct {
+ struct rtattr rta;
+ char ifname[IFNAMSIZ + 1];
+ } __packed dev;
+ } __packed req = {
+ .rt = {
+ .rtm_family = AF_INET,
+ .rtm_table = RT_TABLE_UNSPEC,
+ .rtm_scope = RT_SCOPE_UNIVERSE,
+ .rtm_protocol = RTPROT_BOOT,
+ },
+ .table.rta = {
+ .rta_type = FRA_TABLE,
+ .rta_len = sizeof(req.table),
+ },
+ .dev.rta = {
+ .rta_type = FRA_IFNAME,
+ },
+ };
+
+ int padding = sizeof(req.dev.ifname);
+ padding -= strlen(rif->ifname) + 1;
+
+ strcpy(req.dev.ifname, rif->ifname);
+ req.dev.rta.rta_len = sizeof(req.dev.rta) + strlen(rif->ifname) + 1;
+ req.table.table = rif->rt_table;
+ req.nl.nlmsg_len = sizeof(req) - padding;
+
+ req.nl.nlmsg_flags = NLM_F_REQUEST;
+ if (add) {
+ req.nl.nlmsg_type = RTM_NEWRULE;
+ req.nl.nlmsg_flags |= NLM_F_CREATE | NLM_F_EXCL;
+
+ req.rt.rtm_type = RTN_UNICAST;
+ } else {
+ req.nl.nlmsg_type = RTM_DELRULE;
+ req.rt.rtm_type = RTN_UNSPEC;
+ }
+
+ send(rtnl_sock.fd, &req, req.nl.nlmsg_len, 0);
+ rtnl_flush();
+}
+
+void rtnl_route_set(struct relayd_host *host, bool add)
+{
+ struct relayd_interface *rif;
+
+ list_for_each_entry(rif, &interfaces, list) {
+ if (rif == host->rif)
+ continue;
+
+ rtnl_route_request(rif, host, add);
+ }
+}
+
+void relayd_add_interface_routes(struct relayd_interface *rif)