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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _NETLINK_NETLINK_CTL_H_
#define _NETLINK_NETLINK_CTL_H_
#ifdef _KERNEL
/*
* This file provides headers for the public KPI of the netlink
* subsystem
*/
MALLOC_DECLARE(M_NETLINK);
/*
* Macro for handling attribute TLVs
*/
#define _roundup2(x, y) (((x)+((y)-1))&(~((y)-1)))
#define NETLINK_ALIGN_SIZE sizeof(uint32_t)
#define NETLINK_ALIGN(_len) _roundup2(_len, NETLINK_ALIGN_SIZE)
#define NLA_ALIGN_SIZE sizeof(uint32_t)
#define NLA_ALIGN(_len) _roundup2(_len, NLA_ALIGN_SIZE)
#define NLA_HDRLEN ((int)sizeof(struct nlattr))
#define NLA_DATA_LEN(_nla) ((int)((_nla)->nla_len - NLA_HDRLEN))
#define NLA_DATA(_nla) NL_ITEM_DATA(_nla, NLA_HDRLEN)
#define NLA_DATA_CONST(_nla) NL_ITEM_DATA_CONST(_nla, NLA_HDRLEN)
#define NLA_TYPE(_nla) ((_nla)->nla_type & 0x3FFF)
#ifndef typeof
#define typeof __typeof
#endif
#define NLA_NEXT(_attr) (struct nlattr *)((char *)_attr + NLA_ALIGN(_attr->nla_len))
#define _NLA_END(_start, _len) ((char *)(_start) + (_len))
#define NLA_FOREACH(_attr, _start, _len) \
for (typeof(_attr) _end = (typeof(_attr))_NLA_END(_start, _len), _attr = (_start); \
((char *)_attr < (char *)_end) && \
((char *)NLA_NEXT(_attr) <= (char *)_end); \
_attr = (_len -= NLA_ALIGN(_attr->nla_len), NLA_NEXT(_attr)))
#define NL_ARRAY_LEN(_a) (sizeof(_a) / sizeof((_a)[0]))
#include <netlink/netlink_message_writer.h>
#include <netlink/netlink_message_parser.h>
/* Protocol handlers */
struct nl_pstate;
typedef int (*nl_handler_f)(struct nlmsghdr *hdr, struct nl_pstate *npt);
bool netlink_register_proto(int proto, const char *proto_name, nl_handler_f handler);
bool netlink_unregister_proto(int proto);
/* Common helpers */
bool nl_has_listeners(int netlink_family, uint32_t groups_mask);
bool nlp_has_priv(struct nlpcb *nlp, int priv);
struct ucred *nlp_get_cred(struct nlpcb *nlp);
/* netlink_generic.c */
struct genl_cmd {
const char *cmd_name;
nl_handler_f cmd_cb;
uint32_t cmd_flags;
uint32_t cmd_priv;
uint32_t cmd_num;
};
uint32_t genl_register_family(const char *family_name, size_t hdrsize,
int family_version, int max_attr_idx);
bool genl_unregister_family(const char *family_name);
bool genl_register_cmds(const char *family_name, const struct genl_cmd *cmds,
int count);
uint32_t genl_register_group(const char *family_name, const char *group_name);
/* Debug */
uint32_t nlp_get_pid(const struct nlpcb *nlp);
#endif
#endif
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