FreeBSD/Linux Kernel Cross Reference
sys/netlink/route/neigh.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.
     */
    
    /*
     * Neighbors-related (RTM_<NEW|DEL|GET>NEIGH) message header and attributes.
     */
    
    #ifndef _NETLINK_ROUTE_NEIGH_H_
    #define _NETLINK_ROUTE_NEIGH_H_
    
    /* Base header for all of the relevant messages */
    struct ndmsg {
            uint8_t         ndm_family;
            uint8_t         ndm_pad1;
            uint16_t        ndm_pad2;
            int32_t         ndm_ifindex;
            uint16_t        ndm_state;
            uint8_t         ndm_flags;
            uint8_t         ndm_type;
    };
    
    /* Attributes */
    enum {
            NDA_UNSPEC,
            NDA_DST,                /* binary: neigh l3 address */
            NDA_LLADDR,             /* binary: neigh link-level address */
            NDA_CACHEINFO,          /* binary, struct nda_cacheinfo */
            NDA_PROBES,             /* XXX */
            NDA_VLAN,               /* upper 802.1Q tag */
            NDA_PORT,               /* not supported */
            NDA_VNI,                /* not supported */
            NDA_IFINDEX,            /* interface index */
            NDA_MASTER,             /* not supported */
            NDA_LINK_NETNSID,       /* not supported */
            NDA_SRC_VNI,            /* not supported */
            NDA_PROTOCOL,           /* XXX */
            NDA_NH_ID,              /* not supported */
            NDA_FDB_EXT_ATTRS,      /* not supported */
            NDA_FLAGS_EXT,          /* u32: ndm_flags */
            NDA_NDM_STATE_MASK,     /* XXX */
            NDA_NDM_FLAGS_MASK,     /* XXX */
            __NDA_MAX
    };
    
    #define NDA_MAX (__NDA_MAX - 1)
    
    
    /* ndm_flags / NDA_FLAGS_EXT */
    #define NTF_USE                 0x0001  /* XXX */
    #define NTF_SELF                0x0002  /* local station */
    #define NTF_MASTER              0x0004  /* XXX */
    #define NTF_PROXY               0x0008  /* proxy entry */
    #define NTF_EXT_LEARNED         0x0010  /* not used */
    #define NTF_OFFLOADED           0x0020  /* not used */
    #define NTF_STICKY              0x0040  /* permament entry */
    #define NTF_ROUTER              0x0080  /* dst indicated itself as a router */
    /* start of NDA_FLAGS_EXT */
    #define NTF_EXT_MANAGED         0x0100  /* not used */
    
    /* ndm_state */
    #define NUD_INCOMPLETE          0x01    /* No lladdr, address resolution in progress */
    #define NUD_REACHABLE           0x02    /* reachable & recently resolved */
    #define NUD_STALE               0x04    /* has lladdr but it's stale */
    #define NUD_DELAY               0x08    /* has lladdr, is stale, probes delayed */
    #define NUD_PROBE               0x10    /* has lladdr, is stale, probes sent */
    #define NUD_FAILED              0x20    /* unused */
    
    /* Dummy states */
    #define NUD_NOARP               0x40    /* not used */
    #define NUD_PERMANENT           0x80    /* not flushed */
    #define NUD_NONE                0x00
    
    /* NDA_CACHEINFO */
    struct nda_cacheinfo {
            uint32_t        ndm_confirmed;  /* seconds since ARP/ND was received from neigh */
           uint32_t        ndm_used;       /* seconds since last used (not provided) */
           uint32_t        ndm_updated;    /* seconds since state was updated last */
           uint32_t        ndm_refcnt;     /* number of references held */
   };
   
   #endif

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