FreeBSD/Linux Kernel Cross Reference
sys/netlink/netlink_ctl.h

     /*-
      * 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);
    
    /* 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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