Using Lua with Pktgen

Lua is a high level dynamic programming language. It is small and lightweight and can easily be embedded in applications written in other languages. It is also suitable for loading and wrapping dynamic libraries.

Lua is used in pktgen to script and configure the application and also to plug into DPDK functions to expose configuration and statistics.

The following are some of the examples included in the test directory of pktgen repository.

Example: Hello World

A simple “hello world” example to ensure that everything is working correctly:

package.path = package.path ..";?.lua;test/?.lua;app/?.lua;"

printf("Lua Version      : %s\n", pktgen.info.Lua_Version);
printf("Pktgen Version   : %s\n", pktgen.info.Pktgen_Version);
printf("Pktgen Copyright : %s\n", pktgen.info.Pktgen_Copyright);
printf("Pktgen Authors   : %s\n", pktgen.info.Pktgen_Authors);

printf("\nHello World!!!!\n");

Example: Info

A simple example to print out some metadata and configuration information from pktgen:

package.path = package.path ..";?.lua;test/?.lua;app/?.lua;"

-- A list of the test script for Pktgen and Lua.
-- Each command somewhat mirrors the pktgen command line versions.
-- A couple of the arguments have be changed to be more like the others.
--
pktgen.screen("off");
pktgen.pause("Screen off\n", 2000);

printf("Lua Version      : %s\n", pktgen.info.Lua_Version);
printf("Pktgen Version   : %s\n", pktgen.info.Pktgen_Version);
printf("Pktgen Copyright : %s\n", pktgen.info.Pktgen_Copyright);

prints("pktgen.info", pktgen.info);

printf("Port Count %d\n", pktgen.portCount());
printf("Total port Count %d\n", pktgen.totalPorts());

Example: More Info

Another example to print out data from a running pktgen instance:

package.path = package.path ..";?.lua;test/?.lua;app/?.lua;"

-- A list of the test script for Pktgen and Lua.
-- Each command somewhat mirrors the pktgen command line versions.
-- A couple of the arguments have be changed to be more like the others.
--

prints("linkState", pktgen.linkState("all"));
prints("isSending", pktgen.isSending("all"));
prints("portSizes", pktgen.portSizes("all"));
prints("pktStats", pktgen.pktStats("all"));
prints("portRates", pktgen.portStats("all", "rate"));
prints("portStats", pktgen.portStats("all", "port"));

Example: Sequence

An example to set a packet sequence:

Example: Main

A more complex example showing most of the features available via the Lua interface and also show interaction with the user:

package.path = package.path ..";?.lua;test/?.lua;app/?.lua;"

-- A list of the test script for Pktgen and Lua.
-- Each command somewhat mirrors the pktgen command line versions.
-- A couple of the arguments have be changed to be more like the others.
--
pktgen.screen("off");
pktgen.pause("Screen off\n", 2000);
pktgen.screen("on");
pktgen.pause("Screen on\n", 2000);
pktgen.screen("off");
pktgen.pause("Screen off\n", 2000);

printf("delay for 1 second\n");
pktgen.delay(1000);
printf("done\n");

-- 'set' commands for a number of per port values
pktgen.set("all", "count", 100);
pktgen.set("all", "rate", 50);
pktgen.set("all", "size", 256);
pktgen.set("all", "burst", 128);
pktgen.set("all", "sport", 0x5678);
pktgen.set("all", "dport", 0x9988);
pktgen.set("all", "prime", 3);
pktgen.set("all", "seq_cnt", 3);

pktgen.rnd("all", 1, 20, "XX111000.. ..xx11");

pktgen.vlanid("all", 55);

pktgen.screen("on");
pktgen.pause("Screen on\n", 2000);
pktgen.screen("off");

-- sequence command in one line
pktgen.seq(0, "all", "0000:4455:6677", "0000:1234:5678", "10.11.0.1", "10.10.0.1/16", 5, 6, "ipv4", "udp", 1, 128);
prints("seq", pktgen.decompile(0, "all"));

-- sequence command using a table of packet configurations
local seq_table = {
    ["eth_dst_addr"] = "0011:4455:6677",
    ["eth_src_addr"] = "0011:1234:5678",
    ["ip_dst_addr"] = "10.12.0.1",
    ["ip_src_addr"] = "10.12.0.1/16",
    ["sport"] = 9,
    ["dport"] = 10,
    ["ethType"] = "ipv4",
    ["ipProto"] = "udp",
    ["vlanid"] = 1,
    ["pktSize"] = 128
  };
pktgen.seqTable(0, "all", seq_table );

prints("seqTable", pktgen.decompile(0, "all"));

pktgen.ports_per_page(2);
pktgen.icmp_echo("all", "on");
pktgen.send_arp("all", "g");
pktgen.set_mac("0-2", "0000:1122:3344");
pktgen.mac_from_arp("on");
pktgen.set_ipaddr("0", "dst", "10.10.2.2");
pktgen.set_ipaddr("0", "src", "10.10.1.2/24");
pktgen.set_ipaddr("1", "dst", "10.10.2.2");
pktgen.set_ipaddr("1", "src", "10.10.2.2/24");
pktgen.set_proto("all", "udp");
pktgen.set_type("all", "ipv6");
pktgen.ping4("all");
--pktgen.ping6("all");
--pktgen.show("all", "scan");
pktgen.pcap("all", "on");
pktgen.ports_per_page(4);
pktgen.start("all");
pktgen.stop("all");
pktgen.prime("all");
pktgen.delay(1000);

pktgen.screen("on");
pktgen.clear("all");
pktgen.cls();
pktgen.reset("all");

pktgen.pause("Do range commands\n", 1000);
pktgen.page("range");
pktgen.dst_mac("all", "start", "0011:2233:4455");
pktgen.src_mac("all", "start", "0033:2233:4455");

pktgen.delay(1000);
pktgen.dst_ip("all", "start", "10.12.0.1");
pktgen.dst_ip("all", "inc", "0.0.0.2");
pktgen.dst_ip("all", "min", "10.12.0.1");
pktgen.dst_ip("all", "max", "10.12.0.64");

pktgen.delay(1000);
pktgen.src_ip("all", "start", "10.13.0.1");
pktgen.src_ip("all", "inc", "0.0.0.3");
pktgen.src_ip("all", "min", "10.13.0.1");
pktgen.src_ip("all", "max", "10.13.0.64");

pktgen.delay(1000);
pktgen.dst_port("all", "start", 1234);
pktgen.dst_port("all", "inc", 4);
pktgen.dst_port("all", "min", 1234);
pktgen.dst_port("all", "max", 2345);

pktgen.delay(1000);
pktgen.src_port("all", "start", 5678);
pktgen.src_port("all", "inc", 5);
pktgen.src_port("all", "min", 1234);
pktgen.src_port("all", "max", 9999);

pktgen.delay(1000);
pktgen.vlan_id("all", "start", 1);
pktgen.vlan_id("all", "inc", 0);
pktgen.vlan_id("all", "min", 1);
pktgen.vlan_id("all", "max", 4094);

pktgen.delay(1000);
pktgen.pkt_size("all", "start", 128);
pktgen.pkt_size("all", "inc", 2);
pktgen.pkt_size("all", "min", 64);
pktgen.pkt_size("all", "max", 1518);

pktgen.pause("Wait a second, then go back to main page\n", 2000);

pktgen.page("0");
pktgen.pause("About to do range\n", 1000);
pktgen.set_range("all", "on");

pktgen.port(2);
pktgen.process("all", "on");
pktgen.blink("0", "on");
pktgen.pause("Pause for a while, then turn off screen\n", 4000);
pktgen.screen("off");

printf("Lua Version      : %s\n", pktgen.info.Lua_Version);
printf("Pktgen Version   : %s\n", pktgen.info.Pktgen_Version);
printf("Pktgen Copyright : %s\n", pktgen.info.Pktgen_Copyright);

prints("pktgen.info", pktgen.info);

printf("Port Count %d\n", pktgen.portCount());
printf("Total port Count %d\n", pktgen.totalPorts());

printf("\nDone, Key pressed is (%s)\n", pktgen.continue("\nPress any key: "));
if ( key == "s" ) then
	pktgen.set("all", "seq_cnt", 4);
	pktgen.save("foobar.cmd");
	pktgen.continue("Saved foobar.cmd, press key to load that file: ");
	pktgen.load("foobar.cmd");
end