/virtual/main.c:288:12: error: use of undeclared identifier 'port_md'
  int_md = port_md.lookup(&inport_key);
           ^
/virtual/main.c:292:8: error: no member named 'packet_len' in 'struct pkt_metadata'
    md.packet_len = int_md->packet_len;
    ~~ ^
/virtual/main.c:292:29: error: no member named 'packet_len' in 'struct pkt_metadata'
    md.packet_len = int_md->packet_len;
                    ~~~~~~  ^
/virtual/main.c:310:5: error: conflicting types for 'iovnet_pkt_redirect'
int iovnet_pkt_redirect(struct CTXTYPE *pkt, struct pkt_metadata *md, int out_port) {
    ^
/virtual/main.c:81:5: note: previous declaration is here
int iovnet_pkt_redirect(struct CTXTYPE *skb,
    ^
/virtual/main.c:313:5: error: use of undeclared identifier 'xdp_nodes'
    xdp_nodes.call(pkt, *next);
    ^
/virtual/main.c:323:3: error: use of undeclared identifier 'port_md'
  port_md.update(&inport_key, md);
  ^
/virtual/main.c:325:3: error: use of undeclared identifier 'xdp_nodes'
  xdp_nodes.call(pkt, CONTROLLER_XDP_MODULE_ID);
  ^
/virtual/main.c:325:23: error: use of undeclared identifier 'CONTROLLER_XDP_MODULE_ID'
  xdp_nodes.call(pkt, CONTROLLER_XDP_MODULE_ID);
                      ^
8 errors generated.
[2018-01-16 14:50:04.868] [iovnetd] [error] failed to init XDP program: Unable to initialize BPF program