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/*
* generic netlink receive message, for libreswan
*
* Copyright (C) 2024 Andrew Cagney
*
* 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 <https://www.gnu.org/licenses/gpl2.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 LINUX_NETLINK_H
#define LINUX_NETLINK_H
#include <stddef.h> /* for size_t */
#include <stdint.h>
#include <stdbool.h>
#include <sys/types.h> /* for pid_t */
#include "verbose.h"
struct nlmsghdr;
struct linux_netlink_context;
struct logger;
/*
* Use struct linux_netlink_context to return the result.
*
* Return FALSE when processing can stop early. Actual status should
* be stored in the linux_netlink_context.
*/
typedef bool linux_netlink_response_processor(struct nlmsghdr *,
struct linux_netlink_context *,
struct verbose verbose);
/*
* Send query and process response.
*
* Returns FALSE when something catastrophic happens.
*
* Note that the processor, above returning FALSE is not catastrophic.
* Things will stop early and return true.
*/
bool linux_netlink_query(const struct nlmsghdr *nlmsg, int netlink_protocol,
linux_netlink_response_processor *processor,
struct linux_netlink_context *context,
struct verbose);
/*
* When reading data from netlink the final packet in each recvfrom()
* will be truncated if it doesn't fit to buffer. Netlink returns up
* to 32KiB of data so always keep that much free.
*/
#define LINUX_NETLINK_BUFSIZE 32768
#endif
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