Add L3 test

Listen for ARP packets and print something out when we see them.

build.mk

@@ -19,7 +19,7 @@ CXXFLAGS += -pthread
 # Ubuntu fails without this, see https://bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1228201
 CXXFLAGS += -Wl,--no-as-needed 
 
-tests = test-reactor fileiotest virtiotest
+tests = test-reactor fileiotest virtiotest l3_test
 
 link = $(CXX) $(CXXFLAGS) -o $@ $^
 
@@ -42,4 +42,6 @@ fileiotest: fileiotest.o reactor.o
 
 virtiotest: virtiotest.o virtio.o reactor.o net.o ip.o
 
+l3_test: l3_test.o virtio.o reactor.o net.o ip.o
+
 -include *.d

l3_test.cc

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2014 Cloudius Systems, Ltd.
+ */
+
+#include "net.hh"
+#include "reactor.hh"
+#include "virtio.hh"
+
+using namespace net;
+
+void dump_arp_packets(l3_protocol& proto) {
+    proto.receive().then([&proto] (packet p, ethernet_address from) {
+        std::cout << "seen arp packet\n";
+        dump_arp_packets(proto);
+    });
+}
+
+int main(int ac, char** av) {
+    auto vnet = create_virtio_net_device("tap0");
+    interface netif(std::move(vnet));
+    netif.run();
+    l3_protocol arp(&netif, 0x0806);
+    dump_arp_packets(arp);
+    the_reactor.run();
+    return 0;
+}
+