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-rw-r--r--extensions/libct_proto_tcp.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/extensions/libct_proto_tcp.c b/extensions/libct_proto_tcp.c
index 58005b0..a2243dc 100644
--- a/extensions/libct_proto_tcp.c
+++ b/extensions/libct_proto_tcp.c
@@ -54,6 +54,15 @@ static const char *states[] = {
"LISTEN"
};
+void help()
+{
+ fprintf(stdout, "--orig-port-src original source port\n");
+ fprintf(stdout, "--orig-port-dst original destination port\n");
+ fprintf(stdout, "--reply-port-src reply source port\n");
+ fprintf(stdout, "--reply-port-dst reply destination port\n");
+ fprintf(stdout, "--state TCP state, fe. ESTABLISHED\n");
+}
+
int parse(char c, char *argv[],
struct ip_conntrack_tuple *orig,
struct ip_conntrack_tuple *reply,
@@ -104,6 +113,20 @@ int parse(char c, char *argv[],
return 1;
}
+int final_check(unsigned int flags)
+{
+ if (!(flags & ORIG_SPORT))
+ return 0;
+ else if (!(flags & ORIG_DPORT))
+ return 0;
+ else if (!(flags & REPL_SPORT))
+ return 0;
+ else if (!(flags & REPL_DPORT))
+ return 0;
+
+ return 1;
+}
+
void print_tuple(struct ip_conntrack_tuple *t)
{
fprintf(stdout, "sport=%d dport=%d ", ntohs(t->src.u.tcp.port),
@@ -121,6 +144,8 @@ static struct ctproto_handler tcp = {
.parse = parse,
.print_tuple = print_tuple,
.print_proto = print_proto,
+ .final_check = final_check,
+ .help = help,
.opts = opts
};