1 files changed, 131 insertions, 0 deletions
diff --git a/src/network.c b/src/network.c
new file mode 100644
index 0000000..6a66a2b
--- /dev/null
+++ b/src/network.c
@@ -0,0 +1,131 @@
+/*
+ * (C) 2006-2007 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include "conntrackd.h"
+#include "network.h"
+#include "log.h"
+
+#include <stdlib.h>
+#include <time.h>
+#include <string.h>
+
+#define NETHDR_ALIGNTO	4
+
+static unsigned int seq_set, cur_seq;
+
+int nethdr_align(int value)
+{
+	return (value + NETHDR_ALIGNTO - 1) & ~(NETHDR_ALIGNTO - 1);
+}
+
+int nethdr_size(int len)
+{
+	return NETHDR_SIZ + len;
+}
+	
+static inline void __nethdr_set(struct nethdr *net, int len)
+{
+	if (!seq_set) {
+		seq_set = 1;
+		cur_seq = time(NULL);
+	}
+	net->version	= CONNTRACKD_PROTOCOL_VERSION;
+	net->len	= len;
+	net->seq	= cur_seq++;
+}
+
+void nethdr_set(struct nethdr *net, int type)
+{
+	__nethdr_set(net, NETHDR_SIZ);
+	net->type = type;
+}
+
+void nethdr_set_ack(struct nethdr *net)
+{
+	__nethdr_set(net, NETHDR_ACK_SIZ);
+}
+
+void nethdr_set_ctl(struct nethdr *net)
+{
+	__nethdr_set(net, NETHDR_SIZ);
+}
+
+static int local_seq_set = 0;
+
+/* this function only tracks, it does not update the last sequence received */
+int nethdr_track_seq(uint32_t seq, uint32_t *exp_seq)
+{
+	int ret = SEQ_UNKNOWN;
+
+	/* netlink sequence tracking initialization */
+	if (!local_seq_set) {
+		ret = SEQ_UNSET;
+		goto out;
+	}
+
+	/* fast path: we received the correct sequence */
+	if (seq == STATE_SYNC(last_seq_recv)+1) {
+		ret = SEQ_IN_SYNC;
+		goto out;
+	}
+
+	/* out of sequence: some messages got lost */
+	if (after(seq, STATE_SYNC(last_seq_recv)+1)) {
+		STATE_SYNC(error).msg_rcv_lost +=
+					seq - STATE_SYNC(last_seq_recv) + 1;
+		ret = SEQ_AFTER;
+		goto out;
+	}
+
+	/* out of sequence: replayed/delayed packet? */
+	if (before(seq, STATE_SYNC(last_seq_recv)+1)) {
+		STATE_SYNC(error).msg_rcv_before++;
+		ret = SEQ_BEFORE;
+	}
+
+out:
+	*exp_seq = STATE_SYNC(last_seq_recv)+1;
+
+	return ret;
+}
+
+void nethdr_track_update_seq(uint32_t seq)
+{
+	if (!local_seq_set)
+		local_seq_set = 1;
+
+	STATE_SYNC(last_seq_recv) = seq;
+}
+
+int nethdr_track_is_seq_set()
+{
+	return local_seq_set;
+}
+
+#include "cache.h"
+
+static int status2type[] = {
+	[C_OBJ_NEW]	= NET_T_STATE_NEW,
+	[C_OBJ_ALIVE]	= NET_T_STATE_UPD,
+	[C_OBJ_DEAD]	= NET_T_STATE_DEL,
+};
+
+int object_status_to_network_type(int status)
+{
+	return status2type[status];
+}