FreeBSD/Linux Kernel Cross Reference
sys/netlink/route/nexthop.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.
     */
    
    /*
     * NEXTHOP-related (RTM_<NEW|DEL|GET>NEXTHOP) message header and attributes.
     */
    
    #ifndef _NETLINK_ROUTE_NEXTHOP_H_
    #define _NETLINK_ROUTE_NEXTHOP_H_
    
    /* Base header for all of the relevant messages */
    struct nhmsg {
            unsigned char   nh_family;      /* transport family */
            unsigned char   nh_scope;       /* ignored on RX, filled by kernel */
            unsigned char   nh_protocol;    /* Routing protocol that installed nh */
            unsigned char   resvd;
            unsigned int    nh_flags;       /* RTNH_F_* flags from route.h */
    };
    
    enum {
            NHA_UNSPEC,
            NHA_ID,         /* u32: nexthop userland index, auto-assigned if 0 */
            NHA_GROUP,      /* binary: array of struct nexthop_grp */
            NHA_GROUP_TYPE, /* u16: set to NEXTHOP_GRP_TYPE */
            NHA_BLACKHOLE,  /* flag: nexthop used to blackhole packets */
            NHA_OIF,        /* u32: transmit ifindex */
            NHA_GATEWAY,    /* network: IPv4/IPv6 gateway addr */
            NHA_ENCAP_TYPE, /* not supported */
            NHA_ENCAP,      /* not supported */
            NHA_GROUPS,     /* flag: match nexthop groups */
            NHA_MASTER,     /* not supported */
            NHA_FDB,        /* not supported */
            NHA_RES_GROUP,  /* not supported */
            NHA_RES_BUCKET, /* not supported */
            __NHA_MAX,
    };
    #define NHA_MAX (__NHA_MAX - 1)
    
    /*
     * Attributes that can be used as filters:
     * NHA_ID (nexhop or group), NHA_OIF, NHA_GROUPS,
     */
    
    /*
     * NHA_GROUP: array of the following structures.
     * If attribute is set, the only other valid attributes are
     *  NHA_ID and NHA_GROUP_TYPE.
     *  NHA_RES_GROUP and NHA_RES_BUCKET are not supported yet
     */
    struct nexthop_grp {
            uint32_t        id;             /* nexhop userland index */
            uint8_t         weight;         /* weight of this nexthop */
            uint8_t         resvd1;
            uint16_t        resvd2;
    };
    
    /* NHA_GROUP_TYPE: u16 */
    enum {
            NEXTHOP_GRP_TYPE_MPATH,         /* default nexthop group */
            NEXTHOP_GRP_TYPE_RES,           /* resilient nexthop group */
            __NEXTHOP_GRP_TYPE_MAX,
    };
    #define NEXTHOP_GRP_TYPE_MAX (__NEXTHOP_GRP_TYPE_MAX - 1)
    
    
    /* NHA_RES_GROUP */
    enum {
            NHA_RES_GROUP_UNSPEC,
            NHA_RES_GROUP_PAD = NHA_RES_GROUP_UNSPEC,
            NHA_RES_GROUP_BUCKETS,
            NHA_RES_GROUP_IDLE_TIMER,
            NHA_RES_GROUP_UNBALANCED_TIMER,
            NHA_RES_GROUP_UNBALANCED_TIME,
            __NHA_RES_GROUP_MAX,
    };
   #define NHA_RES_GROUP_MAX       (__NHA_RES_GROUP_MAX - 1)
   
   #endif

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