// Inputs provided by control-plane
action set_next_hop(bit<32> next_hop) {
  if (next_hop == 0) {
    metadata.next_hop = hdr.ipv4.dst;
  } else {
    metadata.next_hop = next_hop;
  }
}

// Inputs provided by data-plane
action swap_mac(inout bit<48> x,
                inout bit<48> y) {
  bit<48> tmp = x;
  x = y;
  y = tmp;
}

// Inputs provided by control/data-plane
action forward(in bit<9> p, bit<48> d) {
  standard_metadata.egress_spec = p;
  headers.ethernet.dstAddr = d;
}

// Remove header from packet
action decap_ip_ip() {
    hdr.ipv4 = hdr.inner_ipv4;
    hdr.inner_ipv4.setInvalid();
}