From e476a36e65cd8508c6473a19e497fb04487e2214 Mon Sep 17 00:00:00 2001 From: Vadim Kochan Date: Tue, 26 Jan 2016 22:24:59 +0200 Subject: trafgen: Add basic protocol generation logic Add new trafgen_proto.c module with basic protocol header fields generation logic. This will allow to support protocol specific keywords in the trafgen configuration language. Each protocol must implement struct proto_hdr and register it to the global proto list. Protocol headers consist of a set of fields, and each field must be described via struct proto_field by specifying unique id, length and offset (relative to the header start). Fields smaller than 8 bits can be described via left shift & mask. The following callbacks are invoked to perform special actions to build the header during parsing: 1) header_init - required fields must be added to the packet and initialized with default values. 2) header_finish - it is invoked when header is specified, all user specified fields are set. 3) packet_finish - callback is invoked from upper to lower header to calculate fields depending on upper layers such as total length or checksum. The protocol generation API provides convenience protocol field setters/getters to to be used in the parser while crafting the packet. Signed-off-by: Vadim Kochan [tk: wordsmithing on commit message, minor variable type changes] Signed-off-by: Tobias Klauser --- trafgen/Makefile | 1 + 1 file changed, 1 insertion(+) (limited to 'trafgen') diff --git a/trafgen/Makefile b/trafgen/Makefile index bc256b2..2ea684f 100644 --- a/trafgen/Makefile +++ b/trafgen/Makefile @@ -19,6 +19,7 @@ trafgen-objs = xmalloc.o \ timer.o \ sysctl.o \ cpp.o \ + trafgen_proto.o \ trafgen_lexer.yy.o \ trafgen_parser.tab.o \ trafgen.o -- cgit v1.2.3-54-g00ecf