trafgen: proto: Increment proto field at runtime

Implement incrementing of proto field at runtime with min & max
parameters, by default if the 'min' parameter is not specified then
original value is used. For fields which len is greater than 4 - last 4
bytes are incremented as 4 byte value (this trick is used to increment
MAC/IPv6 addresses).

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

1 files changed, 11 insertions, 0 deletions

diff --git a/trafgen_proto.h b/trafgen_proto.h
index 6cdc51f..0a1c3de 100644
--- a/trafgen_proto.h
+++ b/trafgen_proto.h
@@ -51,7 +51,18 @@ struct proto_hdr {
 	size_t len;
 };
 
+enum proto_field_func_t {
+	PROTO_FIELD_FUNC_INC = 1 << 0,
+	PROTO_FIELD_FUNC_MIN = 1 << 1,
+};
+
 struct proto_field_func {
+	enum proto_field_func_t type;
+	uint32_t min;
+	uint32_t max;
+	int32_t inc;
+	uint32_t val;
+
 	void (*update_field)(struct proto_field *field);
 };