Method Init

core/modules/generic_encap.cc:104–126

Takes a list of fields. Each field is either: * * 1. {'size': X, 'value': Y} (for constant values) * 2. {'size': X, 'attribute': Y} (for metadata attributes) * * e.g.: GenericEncap([{'size': 4, 'value': 0xdeadbeef}, * {'size': 2, 'attribute': 'foo'}, * {'size': 2, 'value': 0x1234}]) * will prepend a 8-byte header: * de ad be ef 12 34

 * for each packet.
 */
CommandResponse GenericEncap::Init(const bess::pb::GenericEncapArg &arg) {
  int size_acc = 0;

  for (int i = 0; i < arg.fields_size(); i++) {
    const auto &field = arg.fields(i);
    CommandResponse err;
    struct Field *f = &fields_[i];

    f->pos = size_acc;

    err = AddFieldOne(field, f, i);
    if (err.error().code() != 0) {
      return err;
    }

    size_acc += f->size;
  }

  encap_size_ = size_acc;
  num_fields_ = arg.fields_size();

  return CommandSuccess();
}

void GenericEncap::ProcessBatch(Context *ctx, bess::PacketBatch *batch) {
  int cnt = batch->cnt();