libhydra: Move all kernel plugins to libcharon

1 files changed, 104 insertions, 0 deletions

diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.h b/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.h
new file mode 100644
index 000000000..b034326d7
--- /dev/null
+++ b/src/libcharon/plugins/kernel_netlink/kernel_netlink_shared.h
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#ifndef KERNEL_NETLINK_SHARED_H_
+#define KERNEL_NETLINK_SHARED_H_
+
+#include <library.h>
+
+#include <linux/rtnetlink.h>
+
+/**
+ * Default buffer size.
+ *
+ * 1024 byte is currently sufficient for all operations.
+ */
+#ifndef KERNEL_NETLINK_BUFSIZE
+#define KERNEL_NETLINK_BUFSIZE 1024
+#endif
+
+/**
+ * General purpose netlink buffer.
+ *
+ * Some platforms require an enforced aligment to four bytes (e.g. ARM).
+ */
+typedef union {
+	struct nlmsghdr hdr;
+	u_char bytes[KERNEL_NETLINK_BUFSIZE];
+} netlink_buf_t __attribute__((aligned(RTA_ALIGNTO)));
+
+typedef struct netlink_socket_t netlink_socket_t;
+
+/**
+ * Wrapper around a netlink socket.
+ */
+struct netlink_socket_t {
+
+	/**
+	 * Send a netlink message and wait for a reply.
+	 *
+	 * @param	in		netlink message to send
+	 * @param	out 	received netlink message
+	 * @param	out_len	length of the received message
+	 */
+	status_t (*send)(netlink_socket_t *this, struct nlmsghdr *in,
+					 struct nlmsghdr **out, size_t *out_len);
+
+	/**
+	 * Send a netlink message and wait for its acknowledge.
+	 *
+	 * @param	in		netlink message to send
+	 */
+	status_t (*send_ack)(netlink_socket_t *this, struct nlmsghdr *in);
+
+	/**
+	 * Destroy the socket.
+	 */
+	void (*destroy)(netlink_socket_t *this);
+};
+
+/**
+ * Create a netlink_socket_t object.
+ *
+ * @param protocol	protocol type (e.g. NETLINK_XFRM or NETLINK_ROUTE)
+ * @param names		optional enum names for Netlink messages
+ * @param parallel	support parallel queries on this Netlink socket
+ */
+netlink_socket_t *netlink_socket_create(int protocol, enum_name_t *names,
+										bool parallel);
+
+/**
+ * Creates an rtattr and adds it to the given netlink message.
+ *
+ * @param hdr			netlink message
+ * @param rta_type		type of the rtattr
+ * @param data			data to add to the rtattr
+ * @param buflen		length of the netlink message buffer
+ */
+void netlink_add_attribute(struct nlmsghdr *hdr, int rta_type, chunk_t data,
+						   size_t buflen);
+
+/**
+ * Reserve space in a netlink message for given size and type, returning buffer.
+ *
+ * @param hdr			netlink message
+ * @param buflen		size of full netlink buffer
+ * @param type			RTA type
+ * @param len			length of RTA data
+ * @return				buffer to len bytes of attribute data, NULL on error
+ */
+void* netlink_reserve(struct nlmsghdr *hdr, int buflen, int type, int len);
+
+#endif /* KERNEL_NETLINK_SHARED_H_ */