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Intel Threading Building Blocks
book

Intel Threading Building Blocks

by James Reinders
July 2007
Intermediate to advanced content levelIntermediate to advanced
332 pages
10h 4m
English
O'Reilly Media, Inc.
Content preview from Intel Threading Building Blocks

Class gateway : public tbb::filter

The filter class gateway (Example 11-47), in this simple example, only checks for FTP applications. If it is an FTP command, it looks at the application payload that would contain a command port somewhere. (In this packet trace input, all the rest of the packet has been thrown away.) The ALG modifies the mapped_ports_table to anticipate receiving FTP packets for this command port.

Example 11-47. Filter to check for specific (FTP) applications

class gateway : public tbb::filter { const ip_t outgoing_ip; const nic_t outgoing_nic; // port => address, // where port={router mapped port | home device port} // and // address = {home device port | pair(IP, router mapped port)} mapped_ports_table& mapped_ports; public: gateway (ip_t& _outgoing_ip, nic_t& _outgoing_nic, mapped_ports_table& _mapped_ports) : outgoing_ip(_outgoing_ip), outgoing_nic(_outgoing_nic), mapped_ports(_mapped_ports), filter (true /* is_serial*/) { } void* operator() (void* item) { packet_trace* packet = static_cast<packet_trace*> (item); if (packet->packetDestPort == FTPcmdPort) { // outbound packet sends FTP command // packetPayloadApp contains data port – // save it in ports table add_new_mapping (packet->packetSrcIp, packet->packetPayloadApp, packet->packetSrcPort); packet->packetSrcIp = outgoing_ip; packet->packetPayloadApp = packet->packetSrcPort; } return packet; } port_t& add_new_mapping (ip_t& ip, port_t& port, port_t& new_port) { port_number* mapped_port = new port_number (port); ...
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Publisher Resources

ISBN: 9780596514808Errata Page