--- /dev/null
+/*
+ * 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
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