+ .table.rta = {
+ .rta_type = FRA_TABLE,
+ .rta_len = sizeof(req.table),
+ },
+ };
+ const char *ifname = "lo";
+ int padding = sizeof(req.dev.ifname);
+
+ if (rif)
+ ifname = rif->ifname;
+
+ if (!(flags & RULE_F_DEFGW_WORKAROUND)) {
+ req.dev.rta.rta_type = FRA_IFNAME;
+ padding -= strlen(ifname) + 1;
+ strcpy(req.dev.ifname, ifname);
+ req.dev.rta.rta_len = sizeof(req.dev.rta) + strlen(ifname) + 1;
+ } else {
+ req.dev.rta.rta_type = FRA_PRIORITY;
+ req.dev.rta.rta_len = sizeof(req.dev.rta) + sizeof(uint32_t);
+ padding -= sizeof(uint32_t);
+ *((uint32_t *) &req.dev.ifname) = 1;
+ }
+ req.table.table = get_route_table(rif);
+ req.nl.nlmsg_len = sizeof(req) - padding;
+
+ req.nl.nlmsg_flags = NLM_F_REQUEST;
+ if (flags & RULE_F_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();
+}
+
+struct rtnl_addr {
+ struct rtattr rta;
+ uint8_t ipaddr[4];
+} __packed;
+
+static struct rtnl_addr *
+rtnl_add_addr(struct rtnl_addr *addr, int *len, int type, const uint8_t *ipaddr)
+{
+ addr->rta.rta_type = type;
+ memcpy(addr->ipaddr, ipaddr, 4);
+ *len += sizeof(*addr);
+ return addr + 1;
+}
+
+static void
+rtnl_route_request(struct relayd_interface *rif, struct relayd_host *host,
+ struct relayd_route *route, bool add)
+{
+ static struct {
+ struct nlmsghdr nl;
+ struct rtmsg rt;
+ struct {
+ struct rtattr rta;
+ int table;
+ } __packed table;
+ struct {
+ struct rtattr rta;
+ int ifindex;
+ } __packed dev;
+ struct rtnl_addr addr[3];
+ } __packed req = {