void Arp::arp_resolve(IP4::addr next_hop) {
PRINT("<ARP RESOLVE> %s\n", next_hop.str().c_str());
auto req = static_unique_ptr_cast<PacketArp>(inet_.create_packet());
req->init(mac_, inet_.ip_addr(), next_hop);
req->set_dest_mac(MAC::BROADCAST);
req->set_opcode(H_request);
// Stat increment requests sent
requests_tx_++;
linklayer_out_(std::move(req), MAC::BROADCAST, Ethertype::ARP);
}
void Arp::arp_resolve(Packet_ptr pckt) {
debug("<ARP RESOLVE> %s\n", pckt->next_hop().str().c_str());
const auto next_hop = pckt->next_hop();
await_resolution(std::move(pckt), next_hop);
auto req = static_unique_ptr_cast<PacketArp>(inet_.create_packet(sizeof(header)));
req->init(mac_, inet_.ip_addr());
req->set_dest_mac(Ethernet::BROADCAST_FRAME);
req->set_dest_ip(next_hop);
req->set_opcode(H_request);
// Stat increment requests sent
requests_tx_++;
linklayer_out_(std::move(req));
}
void Arp::arp_respond(header* hdr_in) {
debug2("\t IP Match. Constructing ARP Reply\n");
// Stat increment replies sent
replies_tx_++;
// Populate ARP-header
auto res = static_unique_ptr_cast<PacketArp>(inet_.create_packet(sizeof(header)));
res->init(mac_, inet_.ip_addr());
res->set_dest_mac(hdr_in->shwaddr);
res->set_dest_ip(hdr_in->sipaddr);
res->set_opcode(H_reply);
debug2("\t My IP: %s belongs to My Mac: %s\n",
res->source_ip().str().c_str(), res->source_mac().str().c_str());
linklayer_out_(std::move(res));
}
void Arp::arp_respond(header* hdr_in, IP4::addr ack_ip) {
PRINT("\t IP Match. Constructing ARP Reply\n");
// Stat increment replies sent
replies_tx_++;
// Populate ARP-header
auto res = static_unique_ptr_cast<PacketArp>(inet_.create_packet());
res->init(mac_, ack_ip, hdr_in->sipaddr);
res->set_dest_mac(hdr_in->shwaddr);
res->set_opcode(H_reply);
PRINT("\t IP: %s is at My Mac: %s\n",
res->source_ip().str().c_str(), res->source_mac().str().c_str());
MAC::Addr dest = hdr_in->shwaddr;
PRINT("<ARP -> physical> Sending response to %s. Linklayer begin: buf + %i \n",
dest.str().c_str(), res->layer_begin() - res->buf() );
linklayer_out_(std::move(res), dest, Ethertype::ARP);
}
