hi,
after I create arp and ethernet message, how to wrapping them into
packet-out message ?
what's wrong with my code ? Any idea is appreciated.
// Create the ARP Reply message
arp arp_packet = arp();
arp_packet.hrd = arp::ETHER; // -- format of
hardware address.
arp_packet.pro = ethernet::IP; // -- format of
protocol address.
arp_packet.hln = htons(6); // --
length of hardware address.
arp_packet.pln = htons(4); // --
length of protocol address.
arp_packet.op = arp::REPLY; // -- arp opcode
(command).
arp_packet.sha = dstmac; // Sender
hardware address
arp_packet.sip = htons(pie.flow.nw_dst); // Sender
IP address
arp_packet.tha = pie.flow.dl_src; // Target
hardware address
arp_packet.tip = htons(pie.flow.nw_src); // Target
IP address
assert(sizeof(arp_packet) >= 28);
// Create the ethernet packet, fill in the info
and set the arp as payload
ethernet eth_pkt = ethernet();
eth_pkt.daddr = pie.flow.dl_src; // destination
ethernet address
eth_pkt.saddr = dstmac; // source
ethernet address
eth_pkt.type = ethernet::ARP; // packet type
ID
assert(sizeof(eth_pkt) >= 14);
//Create the packet_out message
uint8_t actions_len = 8;
size_t opo_size = sizeof(ofp_packet_out) +
actions_len + sizeof(eth_pkt);
assert(opo_size <= UINT16_MAX);
Array_buffer b(opo_size);
ofp_packet_out& opo = b.at<ofp_packet_out>(0);
memset(&opo, 0, sizeof opo);
opo.header.version = OFP_VERSION;
opo.header.type = OFPT_PACKET_OUT;
opo.header.length = htons(opo_size);
opo.header.xid =
htons(openflow_pack::get_xid()); //how to fill this field?
opo.buffer_id = htons(-1);
opo.in_port = htons(pie.flow.in_port);
opo.actions_len = htons(actions_len);
ofp_action_header actions;
memset(&actions,0,sizeof(ofp_action_header));
actions.type = OFPAT_OUTPUT;
actions.len = sizeof(ofp_action_header);
memcpy((uint8_t *)opo.actions, &actions,
actions.len);
memcpy((uint8_t *)opo.actions + actions.len,
ð_pkt, sizeof(eth_pkt));
memcpy((uint8_t *)opo.actions + actions.len +
sizeof(eth_pkt),&arp_packet,sizeof(arp_packet));
//send arp reply message
send_openflow_packet(pie.datapath_id,b,opo.actions,actions.len+sizeof(eth_pkt)+sizeof(arp_packet),opo.in_port,false);
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