/usr/include/netlink/handlers.h is in libnl2-dev 2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* 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>
#ifdef __cplusplus
extern "C" {
#endif
struct nl_cb;
struct nl_sock;
struct nl_msg;
struct ucred;
/**
* @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)
extern struct nl_cb * nl_cb_alloc(enum nl_cb_kind);
extern struct nl_cb * nl_cb_clone(struct nl_cb *);
extern struct nl_cb * nl_cb_get(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_set_all(struct nl_cb *, 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 *);
extern void nl_cb_overwrite_recvmsgs(struct nl_cb *,
int (*func)(struct nl_sock *,
struct nl_cb *));
extern void nl_cb_overwrite_recv(struct nl_cb *,
int (*func)(struct nl_sock *,
struct sockaddr_nl *,
unsigned char **,
struct ucred **));
extern void nl_cb_overwrite_send(struct nl_cb *,
int (*func)(struct nl_sock *,
struct nl_msg *));
#ifdef __cplusplus
}
#endif
#endif
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