103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
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/* SPDX-License-Identifier: MIT */
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/* batman-adv helpers functions library
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*
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* Copyright (c) 2017, Sven Eckelmann <sven@narfation.org>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef _BATADV_GENL_H_
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#define _BATADV_GENL_H_
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#include <netlink/netlink.h>
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#include <netlink/genl/genl.h>
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#include <netlink/genl/ctrl.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include "batman_adv.h"
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/**
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* struct batadv_nlquery_opts - internal state for batadv_genl_query()
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*
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* This structure should be used as member of a struct which tracks the state
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* for the callback. The macro batadv_container_of can be used to convert the
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* arg pointer from batadv_nlquery_opts to the member which contains this
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* struct.
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*/
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struct batadv_nlquery_opts {
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/** @err: current error */
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int err;
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};
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/**
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* BATADV_ARRAY_SIZE() - Get number of items in static array
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* @x: array with known length
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*
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* Return: number of items in array
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*/
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#ifndef BATADV_ARRAY_SIZE
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#define BATADV_ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
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#endif
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/**
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* batadv_container_of() - Calculate address of object that contains address ptr
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* @ptr: pointer to member variable
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* @type: type of the structure containing ptr
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* @member: name of the member variable in struct @type
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*
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* Return: @type pointer of object containing ptr
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*/
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#ifndef batadv_container_of
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#define batadv_container_of(ptr, type, member) __extension__ ({ \
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const __typeof__(((type *)0)->member) *__pmember = (ptr); \
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(type *)((char *)__pmember - offsetof(type, member)); })
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#endif
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/**
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* batadv_genl_missing_attrs() - Check whether @attrs is missing mandatory
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* attribute
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* @attrs: attributes which was parsed by nla_parse()
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* @mandatory: list of required attributes
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* @num: number of required attributes in @mandatory
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*
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* Return: Return true when a attribute is missing, false otherwise
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*/
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static inline bool
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batadv_genl_missing_attrs(struct nlattr *attrs[],
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const enum batadv_nl_attrs mandatory[], size_t num)
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{
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size_t i;
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for (i = 0; i < num; i++) {
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if (!attrs[mandatory[i]])
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return true;
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}
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return false;
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}
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extern struct nla_policy batadv_genl_policy[];
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int batadv_genl_query(const char *mesh_iface, enum batadv_nl_commands nl_cmd,
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nl_recvmsg_msg_cb_t callback, int flags,
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struct batadv_nlquery_opts *query_opts);
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#endif /* _BATADV_GENL_H_ */
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