add libnl-tiny as a small replacement for libnl with only genl support included

SVN-Revision: 15507

package/libnl-tiny/src/include/netlink/handlers.h

@@ -0,0 +1,230 @@
+/*
+ * netlink/handlers.c	default netlink message handlers
+ *
+ *	This library is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU Lesser General Public
+ *	License as published by the Free Software Foundation version 2.1
+ *	of the License.
+ *
+ * Copyright (c) 2003-2006 Thomas Graf <tgraf@suug.ch>
+ */
+
+#ifndef NETLINK_HANDLERS_H_
+#define NETLINK_HANDLERS_H_
+
+#include <stdio.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <netlink/netlink-compat.h>
+#include <netlink/netlink-kernel.h>
+#include <netlink/types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct nl_sock;
+struct nl_msg;
+struct nl_cb;
+/**
+ * @name Callback Typedefs
+ * @{
+ */
+
+/**
+ * nl_recvmsgs() callback for message processing customization
+ * @ingroup cb
+ * @arg msg		netlink message being processed
+ * @arg arg		argument passwd on through caller
+ */
+typedef int (*nl_recvmsg_msg_cb_t)(struct nl_msg *msg, void *arg);
+
+/**
+ * nl_recvmsgs() callback for error message processing customization
+ * @ingroup cb
+ * @arg nla		netlink address of the peer
+ * @arg nlerr		netlink error message being processed
+ * @arg arg		argument passed on through caller
+ */
+typedef int (*nl_recvmsg_err_cb_t)(struct sockaddr_nl *nla,
+				   struct nlmsgerr *nlerr, void *arg);
+
+/** @} */
+
+/**
+ * Callback actions
+ * @ingroup cb
+ */
+enum nl_cb_action {
+	/** Proceed with wathever would come next */
+	NL_OK,
+	/** Skip this message */
+	NL_SKIP,
+	/** Stop parsing altogether and discard remaining messages */
+	NL_STOP,
+};
+
+/**
+ * Callback kinds
+ * @ingroup cb
+ */
+enum nl_cb_kind {
+	/** Default handlers (quiet) */
+	NL_CB_DEFAULT,
+	/** Verbose default handlers (error messages printed) */
+	NL_CB_VERBOSE,
+	/** Debug handlers for debugging */
+	NL_CB_DEBUG,
+	/** Customized handler specified by the user */
+	NL_CB_CUSTOM,
+	__NL_CB_KIND_MAX,
+};
+
+#define NL_CB_KIND_MAX (__NL_CB_KIND_MAX - 1)
+
+/**
+ * Callback types
+ * @ingroup cb
+ */
+enum nl_cb_type {
+	/** Message is valid */
+	NL_CB_VALID,
+	/** Last message in a series of multi part messages received */
+	NL_CB_FINISH,
+	/** Report received that data was lost */
+	NL_CB_OVERRUN,
+	/** Message wants to be skipped */
+	NL_CB_SKIPPED,
+	/** Message is an acknowledge */
+	NL_CB_ACK,
+	/** Called for every message received */
+	NL_CB_MSG_IN,
+	/** Called for every message sent out except for nl_sendto() */
+	NL_CB_MSG_OUT,
+	/** Message is malformed and invalid */
+	NL_CB_INVALID,
+	/** Called instead of internal sequence number checking */
+	NL_CB_SEQ_CHECK,
+	/** Sending of an acknowledge message has been requested */
+	NL_CB_SEND_ACK,
+	__NL_CB_TYPE_MAX,
+};
+
+#define NL_CB_TYPE_MAX (__NL_CB_TYPE_MAX - 1)
+
+struct nl_cb
+{
+	nl_recvmsg_msg_cb_t	cb_set[NL_CB_TYPE_MAX+1];
+	void *			cb_args[NL_CB_TYPE_MAX+1];
+	
+	nl_recvmsg_err_cb_t	cb_err;
+	void *			cb_err_arg;
+
+	/** May be used to replace nl_recvmsgs with your own implementation
+	 * in all internal calls to nl_recvmsgs. */
+	int			(*cb_recvmsgs_ow)(struct nl_sock *,
+						  struct nl_cb *);
+
+	/** Overwrite internal calls to nl_recv, must return the number of
+	 * octets read and allocate a buffer for the received data. */
+	int			(*cb_recv_ow)(struct nl_sock *,
+					      struct sockaddr_nl *,
+					      unsigned char **,
+					      struct ucred **);
+
+	/** Overwrites internal calls to nl_send, must send the netlink
+	 * message. */
+	int			(*cb_send_ow)(struct nl_sock *,
+					      struct nl_msg *);
+
+	int			cb_refcnt;
+};
+
+
+extern struct nl_cb *	nl_cb_alloc(enum nl_cb_kind);
+extern struct nl_cb *	nl_cb_clone(struct nl_cb *);
+extern void		nl_cb_put(struct nl_cb *);
+
+extern int  nl_cb_set(struct nl_cb *, enum nl_cb_type, enum nl_cb_kind,
+		      nl_recvmsg_msg_cb_t, void *);
+extern int  nl_cb_err(struct nl_cb *, enum nl_cb_kind, nl_recvmsg_err_cb_t,
+		      void *);
+
+static inline struct nl_cb *nl_cb_get(struct nl_cb *cb)
+{
+	cb->cb_refcnt++;
+
+	return cb;
+}
+
+/**
+ * Set up a all callbacks
+ * @arg cb		callback set
+ * @arg kind		kind of callback
+ * @arg func		callback function
+ * @arg arg		argument to be passwd to callback function
+ *
+ * @return 0 on success or a negative error code
+ */
+static inline int nl_cb_set_all(struct nl_cb *cb, enum nl_cb_kind kind,
+		  nl_recvmsg_msg_cb_t func, void *arg)
+{
+	int i, err;
+
+	for (i = 0; i <= NL_CB_TYPE_MAX; i++) {
+		err = nl_cb_set(cb, i, kind, func, arg);
+		if (err < 0)
+			return err;
+	}
+
+	return 0;
+}
+
+
+/**
+ * @name Overwriting
+ * @{
+ */
+
+/**
+ * Overwrite internal calls to nl_recvmsgs()
+ * @arg cb		callback set
+ * @arg func		replacement callback for nl_recvmsgs()
+ */
+static inline void nl_cb_overwrite_recvmsgs(struct nl_cb *cb,
+			      int (*func)(struct nl_sock *, struct nl_cb *))
+{
+	cb->cb_recvmsgs_ow = func;
+}
+
+/**
+ * Overwrite internal calls to nl_recv()
+ * @arg cb		callback set
+ * @arg func		replacement callback for nl_recv()
+ */
+static inline void nl_cb_overwrite_recv(struct nl_cb *cb,
+			  int (*func)(struct nl_sock *, struct sockaddr_nl *,
+				      unsigned char **, struct ucred **))
+{
+	cb->cb_recv_ow = func;
+}
+
+/**
+ * Overwrite internal calls to nl_send()
+ * @arg cb		callback set
+ * @arg func		replacement callback for nl_send()
+ */
+static inline void nl_cb_overwrite_send(struct nl_cb *cb,
+			  int (*func)(struct nl_sock *, struct nl_msg *))
+{
+	cb->cb_send_ow = func;
+}
+
+/** @} */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif