trafgen: l2: Add Ethernet protocol header generation

Add trafgen_l2.c module for generating L2 related headers.

Add Ethernet header generating. By default source MAC address
is used from the specified output device.

Signed-off-by: Vadim Kochan <vadim4j@gmail.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 32 insertions, 0 deletions

diff --git a/trafgen_l2.c b/trafgen_l2.c
new file mode 100644
index 0000000..1082049
--- /dev/null
+++ b/trafgen_l2.c
@@ -0,0 +1,32 @@
+/*
+ * netsniff-ng - the packet sniffing beast
+ * Subject to the GPL, version 2.
+ */
+
+#include "built_in.h"
+#include "trafgen_l2.h"
+#include "trafgen_proto.h"
+
+struct proto_field eth_fields[] = {
+	{ .id = ETH_DST_ADDR, .len = 6, },
+	{ .id = ETH_SRC_ADDR, .len = 6, .offset = 6 },
+	{ .id = ETH_PROTO_ID, .len = 2, .offset = 12 },
+};
+
+static void eth_header_init(struct proto_hdr *hdr)
+{
+	proto_header_fields_add(hdr, eth_fields, array_size(eth_fields));
+
+	proto_field_set_default_dev_mac(hdr, ETH_SRC_ADDR);
+}
+
+static struct proto_hdr eth_hdr = {
+	.id		= PROTO_ETH,
+	.layer		= PROTO_L2,
+	.header_init	= eth_header_init,
+};
+
+void protos_l2_init(void)
+{
+	proto_header_register(&eth_hdr);
+}