From 5eb3bc6d5594fccfff26329a26225f999e971652 Mon Sep 17 00:00:00 2001
From: "/C=EU/ST=EU/CN=Pablo Neira Ayuso/emailAddress=pablo@netfilter.org"
 </C=EU/ST=EU/CN=Pablo Neira Ayuso/emailAddress=pablo@netfilter.org>
Date: Mon, 16 Apr 2007 19:08:42 +0000
Subject: first step forward to merge conntrackd and conntrack into the same
 building chain

---
 extensions/libct_proto_sctp.c | 164 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 extensions/libct_proto_sctp.c

(limited to 'extensions/libct_proto_sctp.c')

diff --git a/extensions/libct_proto_sctp.c b/extensions/libct_proto_sctp.c
new file mode 100644
index 0000000..1c8f0d1
--- /dev/null
+++ b/extensions/libct_proto_sctp.c
@@ -0,0 +1,164 @@
+/*
+ * (C) 2005 by Harald Welte <laforge@netfilter.org>
+ *     2006 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ *      This program is free software; you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation; either version 2 of the License, or
+ *      (at your option) any later version.
+ *
+ */
+#include <stdio.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+#include <netinet/in.h> /* For htons */
+#include "conntrack.h"
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_sctp.h>
+
+static struct option opts[] = {
+	{"orig-port-src", 1, 0, '1'},
+	{"orig-port-dst", 1, 0, '2'},
+	{"reply-port-src", 1, 0, '3'},
+	{"reply-port-dst", 1, 0, '4'},
+	{"state", 1, 0, '5'},
+	{"tuple-port-src", 1, 0, '6'},
+	{"tuple-port-dst", 1, 0, '7'},
+	{0, 0, 0, 0}
+};
+
+static const char *states[] = {
+	"NONE",
+	"CLOSED",
+	"COOKIE_WAIT",
+	"COOKIE_ECHOED",
+	"ESTABLISHED",
+	"SHUTDOWN_SENT",
+	"SHUTDOWN_RECV",
+	"SHUTDOWN_ACK_SENT",
+};
+
+static 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                SCTP state, fe. ESTABLISHED\n");
+	fprintf(stdout, "--tuple-port-src	expectation tuple src port\n");
+	fprintf(stdout, "--tuple-port-src	expectation tuple dst port\n");
+}
+
+static int parse_options(char c, char *argv[], 
+			 struct nfct_tuple *orig,
+			 struct nfct_tuple *reply,
+			 struct nfct_tuple *exptuple,
+			 struct nfct_tuple *mask,
+			 union nfct_protoinfo *proto,
+			 unsigned int *flags)
+{
+	switch(c) {
+		case '1':
+			if (optarg) {
+				orig->l4src.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_ORIG_SPORT;
+			}
+			break;
+		case '2':
+			if (optarg) {
+				orig->l4dst.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_ORIG_DPORT;
+			}
+			break;
+		case '3':
+			if (optarg) {
+				reply->l4src.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_REPL_SPORT;
+			}
+			break;
+		case '4':
+			if (optarg) {
+				reply->l4dst.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_REPL_DPORT;
+			}
+			break;
+		case '5':
+			if (optarg) {
+				int i;
+				for (i=0; i<10; i++) {
+					if (strcmp(optarg, states[i]) == 0) {
+						/* FIXME: Add state to
+						 * nfct_protoinfo
+						proto->sctp.state = i; */
+						break;
+					}
+				}
+				if (i == 10) {
+					printf("doh?\n");
+					return 0;
+				}
+				*flags |= SCTP_STATE;
+			}
+			break;
+		case '6':
+			if (optarg) {
+				exptuple->l4src.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_EXPTUPLE_SPORT;
+			}
+			break;
+		case '7':
+			if (optarg) {
+				exptuple->l4dst.sctp.port = htons(atoi(optarg));
+				*flags |= SCTP_EXPTUPLE_DPORT;
+			}
+
+	}
+	return 1;
+}
+
+static int final_check(unsigned int flags,
+		       unsigned int command,
+		       struct nfct_tuple *orig,
+		       struct nfct_tuple *reply)
+{
+	int ret = 0;
+	
+	if ((flags & (SCTP_ORIG_SPORT|SCTP_ORIG_DPORT)) 
+	    && !(flags & (SCTP_REPL_SPORT|SCTP_REPL_DPORT))) {
+		reply->l4src.sctp.port = orig->l4dst.sctp.port;
+		reply->l4dst.sctp.port = orig->l4src.sctp.port;
+		ret = 1;
+	} else if (!(flags & (SCTP_ORIG_SPORT|SCTP_ORIG_DPORT))
+	            && (flags & (SCTP_REPL_SPORT|SCTP_REPL_DPORT))) {
+		orig->l4src.sctp.port = reply->l4dst.sctp.port;
+		orig->l4dst.sctp.port = reply->l4src.sctp.port;
+		ret = 1;
+	}
+	if ((flags & (SCTP_ORIG_SPORT|SCTP_ORIG_DPORT)) 
+	    && ((flags & (SCTP_REPL_SPORT|SCTP_REPL_DPORT))))
+		ret = 1;
+
+	/* --state is missing and we are trying to create a conntrack */
+	if (ret && (command & CT_CREATE) && (!(flags & SCTP_STATE)))
+		ret = 0;
+
+	return ret;
+}
+
+static struct ctproto_handler sctp = {
+	.name 			= "sctp",
+	.protonum		= IPPROTO_SCTP,
+	.parse_opts		= parse_options,
+	.final_check		= final_check,
+	.help			= help,
+	.opts			= opts,
+	.version		= VERSION,
+};
+
+static void __attribute__ ((constructor)) init(void);
+
+static void init(void)
+{
+	register_proto(&sctp);
+}
-- 
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