gdouble internetwork_sampleLatency(Internetwork* internet, GQuark sourceNodeID, GQuark destinationNodeID) {
MAGIC_ASSERT(internet);
Node* sourceNode = internetwork_getNode(internet, sourceNodeID);
in_addr_t sourceIP = node_getDefaultIP(sourceNode);
Node* destinationNode = internetwork_getNode(internet, destinationNodeID);
in_addr_t destinationIP = node_getDefaultIP(destinationNode);
return network_sampleLinkLatency(sourceIP, destinationIP);
}
static Packet* _tcp_createPacket(TCP* tcp, enum ProtocolTCPFlags flags, gconstpointer payload, gsize payloadLength) {
MAGIC_ASSERT(tcp);
/*
* packets from children of a server must appear to be coming from the server
*/
in_addr_t sourceIP = tcp_getIP(tcp);
in_port_t sourcePort = (tcp->child) ? tcp->child->parent->super.boundPort :
tcp->super.boundPort;
in_addr_t destinationIP = tcp_getPeerIP(tcp);
in_port_t destinationPort = (tcp->server) ? tcp->server->lastPeerPort : tcp->super.peerPort;
if(sourceIP == htonl(INADDR_ANY)) {
sourceIP = node_getDefaultIP(worker_getPrivate()->cached_node);
}
g_assert(sourceIP && sourcePort && destinationIP && destinationPort);
/* make sure our receive window is up to date before putting it in the packet */
_tcp_updateReceiveWindow(tcp);
/* control packets have no sequence number
* (except FIN, so we close after sending everything) */
guint sequence = ((payloadLength > 0) || (flags & PTCP_FIN)) ? tcp->send.next : 0;
/* create the TCP packet */
Packet* packet = packet_new(payload, payloadLength);
packet_setTCP(packet, flags, sourceIP, sourcePort, destinationIP, destinationPort,
sequence, tcp->receive.next, tcp->receive.window);
/* update sequence number */
if(sequence > 0) {
tcp->send.next++;
}
return packet;
}
