/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2015 - 2018 Red Hat, Inc.
 */

#include "libnm-glib-aux/nm-default-glib-i18n-lib.h"

#include "nmp-object.h"

#include <unistd.h>
#include <linux/rtnetlink.h>
#include <linux/if.h>
#include <libudev.h>

#include "libnm-glib-aux/nm-secret-utils.h"
#include "libnm-platform/nm-platform-utils.h"
#include "libnm-platform/wifi/nm-wifi-utils.h"
#include "libnm-platform/wpan/nm-wpan-utils.h"

/*****************************************************************************/

#define _NMLOG_DOMAIN LOGD_PLATFORM
#define _NMLOG(level, obj, ...)                                         \
    G_STMT_START                                                        \
    {                                                                   \
        const NMLogLevel __level = (level);                             \
                                                                        \
        if (nm_logging_enabled(__level, _NMLOG_DOMAIN)) {               \
            const NMPObject *const __obj = (obj);                       \
                                                                        \
            _nm_log(__level,                                            \
                    _NMLOG_DOMAIN,                                      \
                    0,                                                  \
                    NULL,                                               \
                    NULL,                                               \
                    "nmp-object[" NM_HASH_OBFUSCATE_PTR_FMT ""          \
                    "/%s]: " _NM_UTILS_MACRO_FIRST(__VA_ARGS__),        \
                    NM_HASH_OBFUSCATE_PTR(__obj),                       \
                    (__obj ? NMP_OBJECT_GET_CLASS(__obj)->obj_type_name \
                           : "???") _NM_UTILS_MACRO_REST(__VA_ARGS__)); \
        }                                                               \
    }                                                                   \
    G_STMT_END

/*****************************************************************************/

typedef struct {
    NMDedupMultiIdxType parent;
    NMPCacheIdType      cache_id_type;
} DedupMultiIdxType;

struct _NMPCache {
    /* the cache contains only one hash table for all object types, and similarly
     * it contains only one NMMultiIndex.
     * This works, because different object types don't ever compare equal and
     * because their index ids also don't overlap.
     *
     * For routes and addresses, the cache contains an address if (and only if) the
     * object was reported via netlink.
     * For links, the cache contain a link if it was reported by either netlink
     * or udev. That means, a link object can be alive, even if it was already
     * removed via netlink.
     *
     * This effectively merges the udev-device cache into the NMPCache.
     */

    NMDedupMultiIndex *multi_idx;

    /* an idx_type entry for each NMP_CACHE_ID_TYPE. Note that NONE (zero)
     * is skipped, so the index is shifted by one: idx_type[cache_id_type - 1].
     *
     * Don't bother, use _idx_type_get() instead! */
    DedupMultiIdxType idx_types[NMP_CACHE_ID_TYPE_MAX];

    gboolean use_udev;
};

/*****************************************************************************/

int
nm_sock_addr_union_cmp(const NMSockAddrUnion *a, const NMSockAddrUnion *b)
{
    nm_assert(!a || NM_IN_SET(a->sa.sa_family, AF_UNSPEC, AF_INET, AF_INET6));
    nm_assert(!b || NM_IN_SET(b->sa.sa_family, AF_UNSPEC, AF_INET, AF_INET6));

    NM_CMP_SELF(a, b);

    NM_CMP_FIELD(a, b, sa.sa_family);
    switch (a->sa.sa_family) {
    case AF_INET:
        NM_CMP_DIRECT(ntohl(a->in.sin_addr.s_addr), ntohl(b->in.sin_addr.s_addr));
        NM_CMP_DIRECT(htons(a->in.sin_port), htons(b->in.sin_port));
        break;
    case AF_INET6:
        NM_CMP_DIRECT_IN6ADDR(&a->in6.sin6_addr, &b->in6.sin6_addr);
        NM_CMP_DIRECT(htons(a->in6.sin6_port), htons(b->in6.sin6_port));
        NM_CMP_FIELD(a, b, in6.sin6_scope_id);
        NM_CMP_FIELD(a, b, in6.sin6_flowinfo);
        break;
    }
    return 0;
}

void
nm_sock_addr_union_hash_update(const NMSockAddrUnion *a, NMHashState *h)
{
    if (!a) {
        nm_hash_update_val(h, 1241364739u);
        return;
    }

    nm_assert(NM_IN_SET(a->sa.sa_family, AF_UNSPEC, AF_INET, AF_INET6));

    switch (a->sa.sa_family) {
    case AF_INET:
        nm_hash_update_vals(h, a->in.sin_family, a->in.sin_addr.s_addr, a->in.sin_port);
        return;
    case AF_INET6:
        nm_hash_update_vals(h,
                            a->in6.sin6_family,
                            a->in6.sin6_addr,
                            a->in6.sin6_port,
                            a->in6.sin6_scope_id,
                            a->in6.sin6_flowinfo);
        return;
    default:
        nm_hash_update_val(h, a->sa.sa_family);
        return;
    }
}

/**
 * nm_sock_addr_union_cpy:
 * @dst: the destination #NMSockAddrUnion. It will always be fully initialized,
 *   to one of the address families AF_INET, AF_INET6, or AF_UNSPEC (in case of
 *   error).
 * @src: (allow-none): the source buffer with an sockaddr to copy. It may be unaligned in
 *   memory. If not %NULL, the buffer must be at least large enough to contain
 *   sa.sa_family, and then, depending on sa.sa_family, it must be large enough
 *   to hold struct sockaddr_in or struct sockaddr_in6.
 *
 * @dst will always be fully initialized (including setting all un-used bytes to zero).
 */
void
nm_sock_addr_union_cpy(NMSockAddrUnion *dst,
                       gconstpointer    src /* unaligned (const NMSockAddrUnion *) */)
{
    struct sockaddr sa;
    gsize           src_len;

    nm_assert(dst);

    *dst = (NMSockAddrUnion) NM_SOCK_ADDR_UNION_INIT_UNSPEC;

    if (!src)
        return;

    memcpy(&sa.sa_family, &((struct sockaddr *) src)->sa_family, sizeof(sa.sa_family));

    if (sa.sa_family == AF_INET)
        src_len = sizeof(struct sockaddr_in);
    else if (sa.sa_family == AF_INET6)
        src_len = sizeof(struct sockaddr_in6);
    else
        return;

    memcpy(dst, src, src_len);
    nm_assert(dst->sa.sa_family == sa.sa_family);
}

/**
 * nm_sock_addr_union_cpy_untrusted:
 * @dst: the destination #NMSockAddrUnion. It will always be fully initialized,
 *   to one of the address families AF_INET, AF_INET6, or AF_UNSPEC (in case of
 *   error).
 * @src: the source buffer with an sockaddr to copy. It may be unaligned in
 *   memory.
 * @src_len: the length of @src in bytes.
 *
 * The function requires @src_len to be either sizeof(struct sockaddr_in) or sizeof (struct sockaddr_in6).
 * If that's the case, then @src will be interpreted as such structure (unaligned), and
 * accessed. It will check sa.sa_family to match the expected sizes, and if it does, the
 * struct will be copied.
 *
 * On any failure, @dst will be set to sa.sa_family AF_UNSPEC.
 * @dst will always be fully initialized (including setting all un-used bytes to zero).
 */
void
nm_sock_addr_union_cpy_untrusted(NMSockAddrUnion *dst,
                                 gconstpointer    src /* unaligned (const NMSockAddrUnion *) */,
                                 gsize            src_len)
{
    int             f_expected;
    struct sockaddr sa;

    nm_assert(dst);

    *dst = (NMSockAddrUnion) NM_SOCK_ADDR_UNION_INIT_UNSPEC;

    if (src_len == sizeof(struct sockaddr_in))
        f_expected = AF_INET;
    else if (src_len == sizeof(struct sockaddr_in6))
        f_expected = AF_INET6;
    else
        return;

    memcpy(&sa.sa_family, &((struct sockaddr *) src)->sa_family, sizeof(sa.sa_family));

    if (sa.sa_family != f_expected)
        return;

    memcpy(dst, src, src_len);
    nm_assert(dst->sa.sa_family == sa.sa_family);
}

const char *
nm_sock_addr_union_to_string(const NMSockAddrUnion *sa, char *buf, gsize len)
{
    char s_addr[NM_INET_ADDRSTRLEN];
    char s_scope_id[40];

    if (!nm_utils_to_string_buffer_init_null(sa, &buf, &len))
        return buf;

    /* maybe we should use getnameinfo(), but here implement it ourself.
     *
     * We want to see the actual bytes for debugging (as we understand them),
     * and now what getnameinfo() makes of it. Also, it's simpler this way. */

    switch (sa->sa.sa_family) {
    case AF_INET:
        g_snprintf(buf,
                   len,
                   "%s:%u",
                   nm_inet4_ntop(sa->in.sin_addr.s_addr, s_addr),
                   (guint) htons(sa->in.sin_port));
        break;
    case AF_INET6:
        g_snprintf(buf,
                   len,
                   "[%s%s]:%u",
                   nm_inet6_ntop(&sa->in6.sin6_addr, s_addr),
                   (sa->in6.sin6_scope_id != 0
                        ? nm_sprintf_buf(s_scope_id, "%u", sa->in6.sin6_scope_id)
                        : ""),
                   (guint) htons(sa->in6.sin6_port));
        break;
    case AF_UNSPEC:
        g_snprintf(buf, len, "unspec");
        break;
    default:
        g_snprintf(buf, len, "{addr-family:%u}", (unsigned) sa->sa.sa_family);
        break;
    }

    return buf;
}

/*****************************************************************************/

const char *
nmp_object_link_udev_device_get_property_value(const NMPObject *obj, const char *key)
{
    nm_assert(key);

    if (!obj)
        return nm_assert_unreachable_val(NULL);

    nm_assert(NMP_OBJECT_GET_TYPE(obj) == NMP_OBJECT_TYPE_LINK);

    if (!obj->_link.udev.device)
        return NULL;

    return udev_device_get_property_value(obj->_link.udev.device, key);
}

/*****************************************************************************/

static const NMDedupMultiIdxTypeClass _dedup_multi_idx_type_class;

static void
_idx_obj_id_hash_update(const NMDedupMultiIdxType *idx_type,
                        const NMDedupMultiObj     *obj,
                        NMHashState               *h)
{
    const NMPObject *o = (NMPObject *) obj;

    nm_assert(idx_type && idx_type->klass == &_dedup_multi_idx_type_class);
    nm_assert(NMP_OBJECT_GET_TYPE(o) != NMP_OBJECT_TYPE_UNKNOWN);

    nmp_object_id_hash_update(o, h);
}

static gboolean
_idx_obj_id_equal(const NMDedupMultiIdxType *idx_type,
                  const NMDedupMultiObj     *obj_a,
                  const NMDedupMultiObj     *obj_b)
{
    const NMPObject *o_a = (NMPObject *) obj_a;
    const NMPObject *o_b = (NMPObject *) obj_b;

    nm_assert(idx_type && idx_type->klass == &_dedup_multi_idx_type_class);
    nm_assert(NMP_OBJECT_GET_TYPE(o_a) != NMP_OBJECT_TYPE_UNKNOWN);
    nm_assert(NMP_OBJECT_GET_TYPE(o_b) != NMP_OBJECT_TYPE_UNKNOWN);

    return nmp_object_id_equal(o_a, o_b);
}

static guint
_idx_obj_part(const DedupMultiIdxType *idx_type,
              const NMPObject         *obj_a,
              const NMPObject         *obj_b,
              NMHashState             *h)
{
    NMPObjectType obj_type;

    /* the hash/equals functions are strongly related. So, keep them
     * side-by-side and do it all in _idx_obj_part(). */

    nm_assert(idx_type);
    nm_assert(idx_type->parent.klass == &_dedup_multi_idx_type_class);
    nm_assert(obj_a);
    nm_assert(NMP_OBJECT_GET_TYPE(obj_a) != NMP_OBJECT_TYPE_UNKNOWN);
    nm_assert(!obj_b || (NMP_OBJECT_GET_TYPE(obj_b) != NMP_OBJECT_TYPE_UNKNOWN));
    nm_assert(!h || !obj_b);

    switch (idx_type->cache_id_type) {
    case NMP_CACHE_ID_TYPE_OBJECT_TYPE:
        if (obj_b)
            return NMP_OBJECT_GET_TYPE(obj_a) == NMP_OBJECT_GET_TYPE(obj_b);
        if (h) {
            nm_hash_update_vals(h, idx_type->cache_id_type, NMP_OBJECT_GET_TYPE(obj_a));
        }
        return 1;

    case NMP_CACHE_ID_TYPE_LINK_BY_IFNAME:
        if (NMP_OBJECT_GET_TYPE(obj_a) != NMP_OBJECT_TYPE_LINK) {
            /* first check, whether obj_a is suitable for this idx_type.
             * If not, return 0 (which is correct for partitionable(), hash() and equal()
             * functions. */
            if (h)
                nm_hash_update_val(h, obj_a);
            return 0;
        }
        if (obj_b) {
            /* we are in equal() mode. Compare obj_b with obj_a. */
            return NMP_OBJECT_GET_TYPE(obj_b) == NMP_OBJECT_TYPE_LINK
                   && nm_streq(obj_a->link.name, obj_b->link.name);
        }
        if (h) {
            nm_hash_update_val(h, idx_type->cache_id_type);
            nm_hash_update_strarr(h, obj_a->link.name);
        }
        /* just return 1, to indicate that obj_a is partitionable by this idx_type. */
        return 1;

    case NMP_CACHE_ID_TYPE_DEFAULT_ROUTES:
        if (!NM_IN_SET(NMP_OBJECT_GET_TYPE(obj_a),
                       NMP_OBJECT_TYPE_IP4_ROUTE,
                       NMP_OBJECT_TYPE_IP6_ROUTE)
            || !NM_PLATFORM_IP_ROUTE_IS_DEFAULT(&obj_a->ip_route)
            || !nmp_object_is_visible(obj_a)) {
            if (h)
                nm_hash_update_val(h, obj_a);
            return 0;
        }
        if (obj_b) {
            return NMP_OBJECT_GET_TYPE(obj_a) == NMP_OBJECT_GET_TYPE(obj_b)
                   && NM_PLATFORM_IP_ROUTE_IS_DEFAULT(&obj_b->ip_route)
                   && nmp_object_is_visible(obj_b);
        }
        if (h) {
            nm_hash_update_vals(h, idx_type->cache_id_type, NMP_OBJECT_GET_TYPE(obj_a));
        }
        return 1;

    case NMP_CACHE_ID_TYPE_OBJECT_BY_IFINDEX:
        if (!NM_IN_SET(NMP_OBJECT_GET_TYPE(obj_a),
                       NMP_OBJECT_TYPE_IP4_ADDRESS,
                       NMP_OBJECT_TYPE_IP6_ADDRESS,
                       NMP_OBJECT_TYPE_IP4_ROUTE,
                       NMP_OBJECT_TYPE_IP6_ROUTE,
                       NMP_OBJECT_TYPE_QDISC,
                       NMP_OBJECT_TYPE_TFILTER,
                       NMP_OBJECT_TYPE_MPTCP_ADDR)
            || !nmp_object_is_visible(obj_a)) {
            if (h)
                nm_hash_update_val(h, obj_a);
            return 0;
        }
        nm_assert(NMP_OBJECT_CAST_OBJ_WITH_IFINDEX(obj_a)->ifindex > 0
                  || (NMP_OBJECT_CAST_OBJ_WITH_IFINDEX(obj_a)->ifindex == 0
                      && NM_IN_SET(NMP_OBJECT_GET_TYPE(obj_a),
                                   NMP_OBJECT_TYPE_IP4_ROUTE,
                                   NMP_OBJECT_TYPE_IP6_ROUTE)));
        if (obj_b) {
            return NMP_OBJECT_GET_TYPE(obj_a) == NMP_OBJECT_GET_TYPE(obj_b)
                   && NMP_OBJECT_CAST_OBJ_WITH_IFINDEX(obj_a)->ifindex
                          == NMP_OBJECT_CAST_OBJ_WITH_IFINDEX(obj_b)->ifindex
                   && nmp_object_is_visible(obj_b);
        }
        if (h) {
            nm_hash_update_vals(h, idx_type->cache_id_type, obj_a->obj_with_ifindex.ifindex);
        }
        return 1;

    case NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID:
        obj_type = NMP_OBJECT_GET_TYPE(obj_a);
        if (!NM_IN_SET(obj_type, NMP_OBJECT_TYPE_IP4_ROUTE, NMP_OBJECT_TYPE_IP6_ROUTE)
            || NMP_OBJECT_CAST_IP_ROUTE(obj_a)->ifindex < 0) {
            if (h)
                nm_hash_update_val(h, obj_a);
            return 0;
        }
        if (obj_b) {
            return obj_type == NMP_OBJECT_GET_TYPE(obj_b)
                   && NMP_OBJECT_CAST_IP_ROUTE(obj_b)->ifindex >= 0
                   && (obj_type == NMP_OBJECT_TYPE_IP4_ROUTE
                           ? (nm_platform_ip4_route_cmp(&obj_a->ip4_route,
                                                        &obj_b->ip4_route,
                                                        NM_PLATFORM_IP_ROUTE_CMP_TYPE_WEAK_ID)
                              == 0)
                           : (nm_platform_ip6_route_cmp(&obj_a->ip6_route,
                                                        &obj_b->ip6_route,
                                                        NM_PLATFORM_IP_ROUTE_CMP_TYPE_WEAK_ID)
                              == 0));
        }
        if (h) {
            nm_hash_update_val(h, idx_type->cache_id_type);
            if (obj_type == NMP_OBJECT_TYPE_IP4_ROUTE)
                nm_platform_ip4_route_hash_update(&obj_a->ip4_route,
                                                  NM_PLATFORM_IP_ROUTE_CMP_TYPE_WEAK_ID,
                                                  h);
            else
                nm_platform_ip6_route_hash_update(&obj_a->ip6_route,
                                                  NM_PLATFORM_IP_ROUTE_CMP_TYPE_WEAK_ID,
                                                  h);
        }
        return 1;

    case NMP_CACHE_ID_TYPE_OBJECT_BY_ADDR_FAMILY:
        obj_type = NMP_OBJECT_GET_TYPE(obj_a);
        /* currently, only routing rules are supported for this cache-id-type. */
        if (obj_type != NMP_OBJECT_TYPE_ROUTING_RULE
            || !NM_IN_SET(obj_a->routing_rule.addr_family, AF_INET, AF_INET6)) {
            if (h)
                nm_hash_update_val(h, obj_a);
            return 0;
        }
        if (obj_b) {
            return NMP_OBJECT_GET_TYPE(obj_b) == NMP_OBJECT_TYPE_ROUTING_RULE
                   && obj_a->routing_rule.addr_family == obj_b->routing_rule.addr_family;
        }
        if (h) {
            nm_hash_update_vals(h, idx_type->cache_id_type, obj_a->routing_rule.addr_family);
        }
        return 1;

    case NMP_CACHE_ID_TYPE_NONE:
    case __NMP_CACHE_ID_TYPE_MAX:
        break;
    }
    nm_assert_not_reached();
    return 0;
}

static gboolean
_idx_obj_partitionable(const NMDedupMultiIdxType *idx_type, const NMDedupMultiObj *obj)
{
    return _idx_obj_part((DedupMultiIdxType *) idx_type, (NMPObject *) obj, NULL, NULL) != 0;
}

static void
_idx_obj_partition_hash_update(const NMDedupMultiIdxType *idx_type,
                               const NMDedupMultiObj     *obj,
                               NMHashState               *h)
{
    _idx_obj_part((DedupMultiIdxType *) idx_type, (NMPObject *) obj, NULL, h);
}

static gboolean
_idx_obj_partition_equal(const NMDedupMultiIdxType *idx_type,
                         const NMDedupMultiObj     *obj_a,
                         const NMDedupMultiObj     *obj_b)
{
    return _idx_obj_part((DedupMultiIdxType *) idx_type,
                         (NMPObject *) obj_a,
                         (NMPObject *) obj_b,
                         NULL);
}

static const NMDedupMultiIdxTypeClass _dedup_multi_idx_type_class = {
    .idx_obj_id_hash_update        = _idx_obj_id_hash_update,
    .idx_obj_id_equal              = _idx_obj_id_equal,
    .idx_obj_partitionable         = _idx_obj_partitionable,
    .idx_obj_partition_hash_update = _idx_obj_partition_hash_update,
    .idx_obj_partition_equal       = _idx_obj_partition_equal,
};

static void
_dedup_multi_idx_type_init(DedupMultiIdxType *idx_type, NMPCacheIdType cache_id_type)
{
    nm_dedup_multi_idx_type_init((NMDedupMultiIdxType *) idx_type, &_dedup_multi_idx_type_class);
    idx_type->cache_id_type = cache_id_type;
}

/*****************************************************************************/

static void
_vlan_xgress_qos_mappings_hash_update(guint n_map, const NMVlanQosMapping *map, NMHashState *h)
{
    /* ensure no padding. */
    G_STATIC_ASSERT(sizeof(NMVlanQosMapping) == 2 * sizeof(guint32));

    nm_hash_update_val(h, n_map);
    if (n_map)
        nm_hash_update(h, map, n_map * sizeof(*map));
}

static int
_vlan_xgress_qos_mappings_cmp(guint                   n_map,
                              const NMVlanQosMapping *map1,
                              const NMVlanQosMapping *map2)
{
    guint i;

    for (i = 0; i < n_map; i++) {
        if (map1[i].from != map2[i].from)
            return map1[i].from < map2[i].from ? -1 : 1;
        if (map1[i].to != map2[i].to)
            return map1[i].to < map2[i].to ? -1 : 1;
    }
    return 0;
}

static void
_vlan_xgress_qos_mappings_cpy(guint                  *dst_n_map,
                              NMVlanQosMapping      **dst_map,
                              guint                   src_n_map,
                              const NMVlanQosMapping *src_map)
{
    if (src_n_map == 0) {
        nm_clear_g_free(dst_map);
        *dst_n_map = 0;
    } else if (src_n_map != *dst_n_map
               || _vlan_xgress_qos_mappings_cmp(src_n_map, *dst_map, src_map) != 0) {
        nm_clear_g_free(dst_map);
        *dst_n_map = src_n_map;
        *dst_map   = nm_memdup(src_map, sizeof(*src_map) * src_n_map);
    }
}

/*****************************************************************************/

static void
_wireguard_allowed_ip_hash_update(const NMPWireGuardAllowedIP *ip, NMHashState *h)
{
    nm_hash_update_vals(h, ip->family, ip->mask);

    if (ip->family == AF_INET)
        nm_hash_update_val(h, ip->addr.addr4);
    else if (ip->family == AF_INET6)
        nm_hash_update_val(h, ip->addr.addr6);
}

static int
_wireguard_allowed_ip_cmp(const NMPWireGuardAllowedIP *a, const NMPWireGuardAllowedIP *b)
{
    NM_CMP_SELF(a, b);

    NM_CMP_FIELD(a, b, family);
    NM_CMP_FIELD(a, b, mask);

    if (a->family == AF_INET)
        NM_CMP_FIELD(a, b, addr.addr4);
    else if (a->family == AF_INET6)
        NM_CMP_FIELD_IN6ADDR(a, b, addr.addr6);

    return 0;
}

static void
_wireguard_peer_hash_update(const NMPWireGuardPeer *peer, NMHashState *h)
{
    guint i;

    nm_hash_update(h, peer->public_key, sizeof(peer->public_key));
    nm_hash_update(h, peer->preshared_key, sizeof(peer->preshared_key));
    nm_hash_update_vals(h,
                        peer->persistent_keepalive_interval,
                        peer->allowed_ips_len,
                        peer->rx_bytes,
                        peer->tx_bytes,
                        peer->last_handshake_time.tv_sec,
                        peer->last_handshake_time.tv_nsec);

    nm_sock_addr_union_hash_update(&peer->endpoint, h);

    for (i = 0; i < peer->allowed_ips_len; i++)
        _wireguard_allowed_ip_hash_update(&peer->allowed_ips[i], h);
}

static int
_wireguard_peer_cmp(const NMPWireGuardPeer *a, const NMPWireGuardPeer *b)
{
    guint i;

    NM_CMP_SELF(a, b);

    NM_CMP_FIELD(a, b, last_handshake_time.tv_sec);
    NM_CMP_FIELD(a, b, last_handshake_time.tv_nsec);
    NM_CMP_FIELD(a, b, rx_bytes);
    NM_CMP_FIELD(a, b, tx_bytes);
    NM_CMP_FIELD(a, b, allowed_ips_len);
    NM_CMP_FIELD(a, b, persistent_keepalive_interval);
    NM_CMP_FIELD(a, b, endpoint.sa.sa_family);
    NM_CMP_FIELD_MEMCMP(a, b, public_key);
    NM_CMP_FIELD_MEMCMP(a, b, preshared_key);

    NM_CMP_RETURN(nm_sock_addr_union_cmp(&a->endpoint, &b->endpoint));

    for (i = 0; i < a->allowed_ips_len; i++) {
        NM_CMP_RETURN(_wireguard_allowed_ip_cmp(&a->allowed_ips[i], &b->allowed_ips[i]));
    }

    return 0;
}

/*****************************************************************************/

static const char *
_link_get_driver(struct udev_device *udevice, const char *kind, int ifindex)
{
    const char *driver = NULL;

    nm_assert(kind == g_intern_string(kind));

    if (udevice) {
        driver = nmp_utils_udev_get_driver(udevice);
        if (driver)
            return driver;
    }

    if (kind)
        return kind;

    if (ifindex > 0) {
        NMPUtilsEthtoolDriverInfo driver_info;

        if (nmp_utils_ethtool_get_driver_info(ifindex, &driver_info)) {
            if (driver_info.driver[0])
                return g_intern_string(driver_info.driver);
        }
    }

    return "unknown";
}

void
_nmp_object_fixup_link_udev_fields(NMPObject **obj_new, NMPObject *obj_orig, gboolean use_udev)
{
    const char *driver      = NULL;
    gboolean    initialized = FALSE;
    NMPObject  *obj;

    nm_assert(obj_orig || *obj_new);
    nm_assert(obj_new);
    nm_assert(!obj_orig || NMP_OBJECT_GET_TYPE(obj_orig) == NMP_OBJECT_TYPE_LINK);
    nm_assert(!*obj_new || NMP_OBJECT_GET_TYPE(*obj_new) == NMP_OBJECT_TYPE_LINK);

    obj = *obj_new ?: obj_orig;

    /* The link contains internal fields that are combined by
     * properties from netlink and udev. Update those properties */

    /* When a link is not in netlink, its udev fields don't matter. */
    if (obj->_link.netlink.is_in_netlink) {
        driver = _link_get_driver(obj->_link.udev.device, obj->link.kind, obj->link.ifindex);
        if (obj->_link.udev.device)
            initialized = TRUE;
        else if (!use_udev) {
            /* If we don't use udev, we immediately mark the link as initialized.
             *
             * For that, we consult @use_udev argument, that is cached via
             * nmp_cache_use_udev_get(). It is on purpose not to test
             * for a writable /sys on every call. A minor reason for that is
             * performance, but the real reason is reproducibility.
             * */
            initialized = TRUE;
        }
    }

    if (nm_streq0(obj->link.driver, driver) && obj->link.initialized == initialized)
        return;

    if (!*obj_new)
        obj = *obj_new = nmp_object_clone(obj, FALSE);

    obj->link.driver      = driver;
    obj->link.initialized = initialized;
}

static void
_nmp_object_fixup_link_master_connected(NMPObject     **obj_new,
                                        NMPObject      *obj_orig,
                                        const NMPCache *cache)
{
    NMPObject *obj;

    nm_assert(obj_orig || *obj_new);
    nm_assert(obj_new);
    nm_assert(!obj_orig || NMP_OBJECT_GET_TYPE(obj_orig) == NMP_OBJECT_TYPE_LINK);
    nm_assert(!*obj_new || NMP_OBJECT_GET_TYPE(*obj_new) == NMP_OBJECT_TYPE_LINK);

    obj = *obj_new ?: obj_orig;

    if (nmp_cache_link_connected_needs_toggle(cache, obj, NULL, NULL)) {
        if (!*obj_new)
            obj = *obj_new = nmp_object_clone(obj, FALSE);
        obj->link.connected = !obj->link.connected;
    }
}

/*****************************************************************************/

static void
_vt_cmd_obj_dispose_link(NMPObject *obj)
{
    if (obj->_link.udev.device) {
        udev_device_unref(obj->_link.udev.device);
        obj->_link.udev.device = NULL;
    }
    g_clear_object(&obj->_link.ext_data);
    nmp_object_unref(obj->_link.netlink.lnk);
}

static void
_vt_cmd_obj_dispose_ip4_route(NMPObject *obj)
{
    nm_clear_g_free((gpointer *) &obj->_ip4_route.extra_nexthops);
}

static void
_vt_cmd_obj_dispose_lnk_vlan(NMPObject *obj)
{
    g_free((gpointer) obj->_lnk_vlan.ingress_qos_map);
    g_free((gpointer) obj->_lnk_vlan.egress_qos_map);
}

static void
_wireguard_clear(NMPObjectLnkWireGuard *lnk)
{
    guint i;

    nm_explicit_bzero(lnk->_public.private_key, sizeof(lnk->_public.private_key));
    for (i = 0; i < lnk->peers_len; i++) {
        NMPWireGuardPeer *peer = (NMPWireGuardPeer *) &lnk->peers[i];

        nm_explicit_bzero(peer->preshared_key, sizeof(peer->preshared_key));
    }
    g_free((gpointer) lnk->peers);
    g_free((gpointer) lnk->_allowed_ips_buf);
}

static void
_vt_cmd_obj_dispose_lnk_wireguard(NMPObject *obj)
{
    _wireguard_clear(&obj->_lnk_wireguard);
}

static gsize
_NMP_OBJECT_STRUCT_SIZE(const NMPClass *klass)
{
    nm_assert(klass);
    nm_assert(klass->sizeof_public > 0);
    nm_assert(klass->sizeof_public <= klass->sizeof_data);

    return klass->sizeof_data + G_STRUCT_OFFSET(NMPObject, object);
}

static NMPObject *
_nmp_object_new_from_class(const NMPClass *klass)
{
    NMPObject *obj;

    obj                    = g_slice_alloc0(_NMP_OBJECT_STRUCT_SIZE(klass));
    obj->_class            = klass;
    obj->parent._ref_count = 1;
    return obj;
}

NMPObject *
nmp_object_new(NMPObjectType obj_type, gconstpointer plobj)
{
    const NMPClass *klass = nmp_class_from_type(obj_type);
    NMPObject      *obj;

    obj = _nmp_object_new_from_class(klass);
    if (plobj)
        memcpy(&obj->object, plobj, klass->sizeof_public);
    return obj;
}

NMPObject *
nmp_object_new_link(int ifindex)
{
    NMPObject *obj;

    obj               = nmp_object_new(NMP_OBJECT_TYPE_LINK, NULL);
    obj->link.ifindex = ifindex;
    return obj;
}

/*****************************************************************************/

static NMPObject *
_nmp_object_stackinit_from_class(NMPObject *obj, const NMPClass *klass)
{
    nm_assert(obj);

    memset(obj, 0, _NMP_OBJECT_STRUCT_SIZE(klass));
    obj->_class            = klass;
    obj->parent._ref_count = NM_OBJ_REF_COUNT_STACKINIT;
    return obj;
}

static NMPObject *
_nmp_object_stackinit_from_type(NMPObject *obj, NMPObjectType obj_type)
{
    return _nmp_object_stackinit_from_class(obj, nmp_class_from_type(obj_type));
}

const NMPObject *
nmp_object_stackinit(NMPObject *obj, NMPObjectType obj_type, gconstpointer plobj)
{
    const NMPClass *klass = nmp_class_from_type(obj_type);

    _nmp_object_stackinit_from_class(obj, klass);
    if (plobj)
        memcpy(&obj->object, plobj, klass->sizeof_public);
    return obj;
}

const NMPObject *
nmp_object_stackinit_id(NMPObject *obj, const NMPObject *src)
{
    const NMPClass *klass;

    nm_assert(NMP_OBJECT_IS_VALID(src));
    nm_assert(obj);

    klass = NMP_OBJECT_GET_CLASS(src);
    _nmp_object_stackinit_from_class(obj, klass);
    if (klass->cmd_plobj_id_copy)
        klass->cmd_plobj_id_copy(&obj->object, &src->object);
    else {
        /* plain memcpy.
         *
         * Note that for NMPObjectIP4Route this also copies extra_nexthops
         * pointer, aliasing it without taking ownership. That is potentially
         * dangerous, but when using a stack allocated instance, you must
         * always take care of ownership. */
        memcpy(&obj->object, &src->object, klass->sizeof_data);
    }
    return obj;
}

const NMPObject *
nmp_object_stackinit_id_link(NMPObject *obj, int ifindex)
{
    _nmp_object_stackinit_from_type(obj, NMP_OBJECT_TYPE_LINK);
    obj->link.ifindex = ifindex;
    return obj;
}

const NMPObject *
nmp_object_stackinit_id_ip4_address(NMPObject *obj,
                                    int        ifindex,
                                    guint32    address,
                                    guint8     plen,
                                    guint32    peer_address)
{
    _nmp_object_stackinit_from_type(obj, NMP_OBJECT_TYPE_IP4_ADDRESS);
    obj->ip4_address.ifindex      = ifindex;
    obj->ip4_address.address      = address;
    obj->ip4_address.plen         = plen;
    obj->ip4_address.peer_address = peer_address;
    return obj;
}

const NMPObject *
nmp_object_stackinit_id_ip6_address(NMPObject *obj, int ifindex, const struct in6_addr *address)
{
    _nmp_object_stackinit_from_type(obj, NMP_OBJECT_TYPE_IP6_ADDRESS);
    obj->ip4_address.ifindex = ifindex;
    if (address)
        obj->ip6_address.address = *address;
    return obj;
}

/*****************************************************************************/

const char *
nmp_object_to_string(const NMPObject      *obj,
                     NMPObjectToStringMode to_string_mode,
                     char                 *buf,
                     gsize                 buf_size)
{
    const NMPClass *klass;
    char            buf2[NM_UTILS_TO_STRING_BUFFER_SIZE];

    if (!nm_utils_to_string_buffer_init_null(obj, &buf, &buf_size))
        return buf;

    g_return_val_if_fail(NMP_OBJECT_IS_VALID(obj), NULL);

    klass = NMP_OBJECT_GET_CLASS(obj);

    if (klass->cmd_obj_to_string) {
        nm_assert(!klass->cmd_plobj_to_string);
        nm_assert(!klass->cmd_plobj_to_string_id);
        return klass->cmd_obj_to_string(obj, to_string_mode, buf, buf_size);
    }

    nm_assert(klass->cmd_plobj_to_string);

    switch (to_string_mode) {
    case NMP_OBJECT_TO_STRING_ID:
        if (klass->cmd_plobj_to_string_id)
            return klass->cmd_plobj_to_string_id(&obj->object, buf, buf_size);
        g_snprintf(buf, buf_size, NM_HASH_OBFUSCATE_PTR_FMT, NM_HASH_OBFUSCATE_PTR(obj));
        return buf;
    case NMP_OBJECT_TO_STRING_ALL:
        g_snprintf(buf,
                   buf_size,
                   "[%s," NM_HASH_OBFUSCATE_PTR_FMT ",%u,%calive,%cvisible; %s]",
                   klass->obj_type_name,
                   NM_HASH_OBFUSCATE_PTR(obj),
                   obj->parent._ref_count,
                   nmp_object_is_alive(obj) ? '+' : '-',
                   nmp_object_is_visible(obj) ? '+' : '-',
                   klass->cmd_plobj_to_string(&obj->object, buf2, sizeof(buf2)));
        return buf;
    case NMP_OBJECT_TO_STRING_PUBLIC:
        klass->cmd_plobj_to_string(&obj->object, buf, buf_size);
        return buf;
    default:
        g_return_val_if_reached("ERROR");
    }
}

static const char *
_vt_cmd_obj_to_string_link(const NMPObject      *obj,
                           NMPObjectToStringMode to_string_mode,
                           char                 *buf,
                           gsize                 buf_size)
{
    const NMPClass *klass = NMP_OBJECT_GET_CLASS(obj);
    char           *b     = buf;

    switch (to_string_mode) {
    case NMP_OBJECT_TO_STRING_ID:
        g_snprintf(buf, buf_size, "%d", obj->link.ifindex);
        return buf;
    case NMP_OBJECT_TO_STRING_ALL:
        nm_strbuf_append(&b,
                         &buf_size,
                         "[%s," NM_HASH_OBFUSCATE_PTR_FMT
                         ",%u,%calive,%cvisible,%cin-nl," NM_HASH_OBFUSCATE_PTR_FMT "; ",
                         klass->obj_type_name,
                         NM_HASH_OBFUSCATE_PTR(obj),
                         obj->parent._ref_count,
                         nmp_object_is_alive(obj) ? '+' : '-',
                         nmp_object_is_visible(obj) ? '+' : '-',
                         obj->_link.netlink.is_in_netlink ? '+' : '-',
                         NM_HASH_OBFUSCATE_PTR(obj->_link.udev.device));
        nm_platform_link_to_string(&obj->link, b, buf_size);
        nm_strbuf_seek_end(&b, &buf_size);
        if (obj->_link.netlink.lnk) {
            nm_strbuf_append_str(&b, &buf_size, "; ");
            nmp_object_to_string(obj->_link.netlink.lnk, NMP_OBJECT_TO_STRING_ALL, b, buf_size);
            nm_strbuf_seek_end(&b, &buf_size);
        }
        nm_strbuf_append_c(&b, &buf_size, ']');
        return buf;
    case NMP_OBJECT_TO_STRING_PUBLIC:
        nm_platform_link_to_string(&obj->link, b, buf_size);
        if (obj->_link.netlink.lnk) {
            nm_strbuf_seek_end(&b, &buf_size);
            nm_strbuf_append_str(&b, &buf_size, "; ");
            nmp_object_to_string(obj->_link.netlink.lnk, NMP_OBJECT_TO_STRING_PUBLIC, b, buf_size);
        }
        return buf;
    default:
        g_return_val_if_reached("ERROR");
    }
}

static const char *
_vt_cmd_obj_to_string_ip4_route(const NMPObject      *obj,
                                NMPObjectToStringMode to_string_mode,
                                char                 *buf,
                                gsize                 buf_size)
{
    const NMPClass *klass;
    char            buf2[NM_UTILS_TO_STRING_BUFFER_SIZE];

    klass = NMP_OBJECT_GET_CLASS(obj);

    switch (to_string_mode) {
    case NMP_OBJECT_TO_STRING_PUBLIC:
    case NMP_OBJECT_TO_STRING_ID:
        nm_platform_ip4_route_to_string_full(&obj->ip4_route,
                                             obj->_ip4_route.extra_nexthops,
                                             buf,
                                             buf_size);
        return buf;
    case NMP_OBJECT_TO_STRING_ALL:
        g_snprintf(buf,
                   buf_size,
                   "[%s," NM_HASH_OBFUSCATE_PTR_FMT ",%u,%calive,%cvisible; %s]",
                   klass->obj_type_name,
                   NM_HASH_OBFUSCATE_PTR(obj),
                   obj->parent._ref_count,
                   nmp_object_is_alive(obj) ? '+' : '-',
                   nmp_object_is_visible(obj) ? '+' : '-',
                   nmp_object_to_string(obj, NMP_OBJECT_TO_STRING_PUBLIC, buf2, sizeof(buf2)));
        return buf;
    default:
        g_return_val_if_reached("ERROR");
    }
}

static const char *
_vt_cmd_obj_to_string_lnk_vlan(const NMPObject      *obj,
                               NMPObjectToStringMode to_string_mode,
                               char                 *buf,
                               gsize                 buf_size)
{
    const NMPClass *klass;
    char            buf2[NM_UTILS_TO_STRING_BUFFER_SIZE];
    char           *b;
    gsize           l;

    klass = NMP_OBJECT_GET_CLASS(obj);

    switch (to_string_mode) {
    case NMP_OBJECT_TO_STRING_ID:
        g_snprintf(buf, buf_size, NM_HASH_OBFUSCATE_PTR_FMT, NM_HASH_OBFUSCATE_PTR(obj));
        return buf;
    case NMP_OBJECT_TO_STRING_ALL:

        g_snprintf(buf,
                   buf_size,
                   "[%s," NM_HASH_OBFUSCATE_PTR_FMT ",%u,%calive,%cvisible; %s]",
                   klass->obj_type_name,
                   NM_HASH_OBFUSCATE_PTR(obj),
                   obj->parent._ref_count,
                   nmp_object_is_alive(obj) ? '+' : '-',
                   nmp_object_is_visible(obj) ? '+' : '-',
                   nmp_object_to_string(obj, NMP_OBJECT_TO_STRING_PUBLIC, buf2, sizeof(buf2)));
        return buf;
    case NMP_OBJECT_TO_STRING_PUBLIC:
        nm_platform_lnk_vlan_to_string(&obj->lnk_vlan, buf, buf_size);

        b = buf;
        l = strlen(b);
        b += l;
        buf_size -= l;

        if (obj->_lnk_vlan.n_ingress_qos_map) {
            nm_platform_vlan_qos_mapping_to_string(" ingress-qos-map",
                                                   obj->_lnk_vlan.ingress_qos_map,
                                                   obj->_lnk_vlan.n_ingress_qos_map,
                                                   b,
                                                   buf_size);
            l = strlen(b);
            b += l;
            buf_size -= l;
        }
        if (obj->_lnk_vlan.n_egress_qos_map) {
            nm_platform_vlan_qos_mapping_to_string(" egress-qos-map",
                                                   obj->_lnk_vlan.egress_qos_map,
                                                   obj->_lnk_vlan.n_egress_qos_map,
                                                   b,
                                                   buf_size);
            l = strlen(b);
            b += l;
            buf_size -= l;
        }

        return buf;
    default:
        g_return_val_if_reached("ERROR");
    }
}

static const char *
_vt_cmd_obj_to_string_lnk_wireguard(const NMPObject      *obj,
                                    NMPObjectToStringMode to_string_mode,
                                    char                 *buf,
                                    gsize                 buf_size)
{
    const NMPClass *klass;
    char            buf2[NM_UTILS_TO_STRING_BUFFER_SIZE];
    char           *b;
    guint           i;

    klass = NMP_OBJECT_GET_CLASS(obj);

    switch (to_string_mode) {
    case NMP_OBJECT_TO_STRING_ID:
        g_snprintf(buf, buf_size, NM_HASH_OBFUSCATE_PTR_FMT, NM_HASH_OBFUSCATE_PTR(obj));
        return buf;
    case NMP_OBJECT_TO_STRING_ALL:
        b = buf;

        nm_strbuf_append(&b,
                         &buf_size,
                         "[%s," NM_HASH_OBFUSCATE_PTR_FMT ",%u,%calive,%cvisible; %s"
                         "%s",
                         klass->obj_type_name,
                         NM_HASH_OBFUSCATE_PTR(obj),
                         obj->parent._ref_count,
                         nmp_object_is_alive(obj) ? '+' : '-',
                         nmp_object_is_visible(obj) ? '+' : '-',
                         nmp_object_to_string(obj, NMP_OBJECT_TO_STRING_PUBLIC, buf2, sizeof(buf2)),
                         obj->_lnk_wireguard.peers_len > 0 ? " peers {" : "");

        for (i = 0; i < obj->_lnk_wireguard.peers_len; i++) {
            const NMPWireGuardPeer *peer = &obj->_lnk_wireguard.peers[i];

            nm_strbuf_append_str(&b, &buf_size, " { ");
            nm_platform_wireguard_peer_to_string(peer, b, buf_size);
            nm_strbuf_seek_end(&b, &buf_size);
            nm_strbuf_append_str(&b, &buf_size, " }");
        }
        if (obj->_lnk_wireguard.peers_len)
            nm_strbuf_append_str(&b, &buf_size, " }");

        return buf;
    case NMP_OBJECT_TO_STRING_PUBLIC:
        nm_platform_lnk_wireguard_to_string(&obj->lnk_wireguard, buf, buf_size);
        return buf;
    default:
        g_return_val_if_reached("ERROR");
    }
}

#define _vt_cmd_plobj_to_string_id(type, plat_type, ...)                                  \
    static const char *_vt_cmd_plobj_to_string_id_##type(const NMPlatformObject *_obj,    \
                                                         char                   *buf,     \
                                                         gsize                   buf_len) \
    {                                                                                     \
        plat_type *const obj = (plat_type *) _obj;                                        \
        _nm_unused char  buf1[NM_INET_ADDRSTRLEN];                                        \
        _nm_unused char  buf2[NM_INET_ADDRSTRLEN];                                        \
                                                                                          \
        g_snprintf(buf, buf_len, __VA_ARGS__);                                            \
        return buf;                                                                       \
    }                                                                                     \
    _NM_DUMMY_STRUCT_FOR_TRAILING_SEMICOLON

_vt_cmd_plobj_to_string_id(
    ip4_address,
    NMPlatformIP4Address,
    "%d: %s/%d%s%s",
    obj->ifindex,
    nm_inet4_ntop(obj->address, buf1),
    obj->plen,
    obj->peer_address != obj->address ? "," : "",
    obj->peer_address != obj->address
        ? nm_inet4_ntop(nm_ip4_addr_clear_host_address(obj->peer_address, obj->plen), buf2)
        : "");

_vt_cmd_plobj_to_string_id(ip6_address,
                           NMPlatformIP6Address,
                           "%d: %s",
                           obj->ifindex,
                           nm_inet6_ntop(&obj->address, buf1));

_vt_cmd_plobj_to_string_id(qdisc, NMPlatformQdisc, "%d: %d", obj->ifindex, obj->parent);

_vt_cmd_plobj_to_string_id(tfilter, NMPlatformTfilter, "%d: %d", obj->ifindex, obj->parent);

void
nmp_object_hash_update_full(const NMPObject *obj, gboolean for_id, NMHashState *h)
{
    const NMPClass *klass;

    g_return_if_fail(NMP_OBJECT_IS_VALID(obj));

    klass = NMP_OBJECT_GET_CLASS(obj);

    nm_assert((!!klass->cmd_plobj_id_cmp) == (!!klass->cmd_plobj_id_hash_update));
    nm_assert((!!klass->cmd_obj_cmp) == (!!klass->cmd_obj_hash_update));
    nm_assert((!!klass->cmd_plobj_cmp) == (!!klass->cmd_plobj_hash_update));

    nm_assert((!!klass->cmd_obj_hash_update) ^ (!!klass->cmd_plobj_hash_update));
    nm_assert((!klass->cmd_obj_hash_update) || (!klass->cmd_plobj_id_hash_update));

    nm_hash_update_val(h, klass->obj_type);

    if (for_id) {
        if (klass->cmd_obj_hash_update)
            klass->cmd_obj_hash_update(obj, TRUE, h);
        else if (klass->cmd_plobj_id_hash_update)
            klass->cmd_plobj_id_hash_update(&obj->object, h);
        else {
            /* The klass doesn't implement ID compare. It means, to use pointer
             * equality. */
            nm_hash_update_val(h, obj);
        }
        return;
    }

    if (klass->cmd_obj_hash_update)
        klass->cmd_obj_hash_update(obj, FALSE, h);
    else
        klass->cmd_plobj_hash_update(&obj->object, h);
}

static void
_vt_cmd_obj_hash_update_link(const NMPObject *obj, gboolean for_id, NMHashState *h)
{
    nm_assert(NMP_OBJECT_GET_TYPE(obj) == NMP_OBJECT_TYPE_LINK);

    if (for_id) {
        nm_hash_update_val(h, obj->link.ifindex);
        return;
    }

    nm_platform_link_hash_update(&obj->link, h);
    nm_hash_update_vals(h, obj->_link.netlink.is_in_netlink, obj->_link.udev.device);
    if (obj->_link.netlink.lnk)
        nmp_object_hash_update(obj->_link.netlink.lnk, h);
}

static void
_vt_cmd_obj_hash_update_ip4_route(const NMPObject *obj, gboolean for_id, NMHashState *h)
{
    guint i;

    nm_assert(NMP_OBJECT_GET_TYPE(obj) == NMP_OBJECT_TYPE_IP4_ROUTE);

    nm_platform_ip4_route_hash_update(&obj->ip4_route,
                                      for_id ? NM_PLATFORM_IP_ROUTE_CMP_TYPE_ID
                                             : NM_PLATFORM_IP_ROUTE_CMP_TYPE_FULL,
                                      h);
    for (i = 1u; i < obj->ip4_route.n_nexthops; i++)
        nm_platform_ip4_rt_nexthop_hash_update(&obj->_ip4_route.extra_nexthops[i - 1u], for_id, h);
}

static void
_vt_cmd_obj_hash_update_lnk_vlan(const NMPObject *obj, gboolean for_id, NMHashState *h)
{
    nm_assert(NMP_OBJECT_GET_TYPE(obj) == NMP_OBJECT_TYPE_LNK_VLAN);

    if (for_id) {
        nm_hash_update_val(h, obj);
        return;
    }

    nm_platform_lnk_vlan_hash_update(&obj->lnk_vlan, h);
    _vlan_xgress_qos_mappings_hash_update(obj->_lnk_vlan.n_ingress_qos_map,
                                          obj->_lnk_vlan.ingress_qos_map,
                                          h);
    _vlan_xgress_qos_mappings_hash_update(obj->_lnk_vlan.n_egress_qos_map,
                                          obj->_lnk_vlan.egress_qos_map,
                                          h);
}

static void
_vt_cmd_obj_hash_update_lnk_wireguard(const NMPObject *obj, gboolean for_id, NMHashState *h)
{
    guint i;

    nm_assert(NMP_OBJECT_GET_TYPE(obj) == NMP_OBJECT_TYPE_LNK_WIREGUARD);

    if (for_id) {
        nm_hash_update_val(h, obj);
        return;
    }

    nm_platform_lnk_wireguard_hash_update(&obj->lnk_wireguard, h);

    nm_hash_update_val(h, obj->_lnk_wireguard.peers_len);
    for (i = 0; i < obj->_lnk_wireguard.peers_len; i++)
        _wireguard_peer_hash_update(&obj->_lnk_wireguard.peers[i], h);
}

int
nmp_object_cmp_full(const NMPObject *obj1, const NMPObject *obj2, NMPObjectCmpFlags flags)
{
    const NMPClass *klass;
    const NMPClass *klass2;
    NMPObject       obj_stackcopy;

    nm_assert(
        !NM_FLAGS_ANY(flags, ~(NMP_OBJECT_CMP_FLAGS_ID | NMP_OBJECT_CMP_FLAGS_IGNORE_IFINDEX)));

    /* The ID flag (currently) cannot be combined with other flags. That's partly because
     * it's not implemented, but also because some objects use only pointer equality. So it's
     * not clear how that combines with other flags (well, they'd be ignored). */
    nm_assert(!NM_FLAGS_HAS(flags, NMP_OBJECT_CMP_FLAGS_ID) || flags == NMP_OBJECT_CMP_FLAGS_ID);

    NM_CMP_SELF(obj1, obj2);

    g_return_val_if_fail(NMP_OBJECT_IS_VALID(obj1), -1);
    g_return_val_if_fail(NMP_OBJECT_IS_VALID(obj2), 1);

    klass = NMP_OBJECT_GET_CLASS(obj1);

    nm_assert(klass);

    nm_assert((!!klass->cmd_plobj_id_cmp) == (!!klass->cmd_plobj_id_hash_update));
    nm_assert((!!klass->cmd_obj_cmp) == (!!klass->cmd_obj_hash_update));
    nm_assert((!!klass->cmd_plobj_cmp) == (!!klass->cmd_plobj_hash_update));

    nm_assert((!!klass->cmd_obj_cmp) ^ (!!klass->cmd_plobj_cmp));
    nm_assert((!klass->cmd_obj_cmp) || (!klass->cmd_plobj_id_cmp));

    klass2 = NMP_OBJECT_GET_CLASS(obj2);

    if (klass != klass2) {
        nm_assert(klass2);
        NM_CMP_DIRECT(klass->obj_type, klass2->obj_type);
        return nm_assert_unreachable_val(0);
    }

    if (NM_FLAGS_HAS(flags, NMP_OBJECT_CMP_FLAGS_ID)) {
        if (klass->cmd_obj_cmp)
            return klass->cmd_obj_cmp(obj1, obj2, TRUE);
        if (klass->cmd_plobj_id_cmp)
            return klass->cmd_plobj_id_cmp(&obj1->object, &obj2->object);

        /* the klass doesn't implement ID cmp(). That means, different objects
         * never compare equal, but the cmp() according to their pointer value. */
        NM_CMP_DIRECT_PTR(obj1, obj2);
        return nm_assert_unreachable_val(0);
    }

    if (NM_FLAGS_HAS(flags, NMP_OBJECT_CMP_FLAGS_IGNORE_IFINDEX)) {
        if (!NM_IN_SET(klass->obj_type,
                       NMP_OBJECT_TYPE_IP4_ADDRESS,
                       NMP_OBJECT_TYPE_IP6_ADDRESS,
                       NMP_OBJECT_TYPE_IP4_ROUTE,
                       NMP_OBJECT_TYPE_IP6_ROUTE)) {
            /* This flag is currently only implemented for certain types.
             * That is, because we just create a stack copy, and that naive
             * approach only knows for types where we know that it works. */
        } else if (obj1->obj_with_ifindex.ifindex != obj2->obj_with_ifindex.ifindex) {
            nmp_object_stackinit(&obj_stackcopy, klass->obj_type, &obj2->obj_with_ifindex);
            obj_stackcopy.obj_with_ifindex.ifindex = obj1->obj_with_ifindex.ifindex;
            if (klass->obj_type == NMP_OBJECT_TYPE_IP4_ROUTE)
                obj_stackcopy._ip4_route.extra_nexthops = obj2->_ip4_route.extra_nexthops;
            obj2 = &obj_stackcopy;
        }
    }

    if (klass->cmd_obj_cmp)
        return klass->cmd_obj_cmp(obj1, obj2, FALSE);
    return klass->cmd_plobj_cmp(&obj1->object, &obj2->object);
}

static int
_vt_cmd_obj_cmp_link(const NMPObject *obj1, const NMPObject *obj2, gboolean for_id)
{
    if (for_id) {
        NM_CMP_FIELD(obj1, obj2, link.ifindex);
        return 0;
    }

    NM_CMP_RETURN(nm_platform_link_cmp(&obj1->link, &obj2->link));
    NM_CMP_DIRECT(obj1->_link.netlink.is_in_netlink, obj2->_link.netlink.is_in_netlink);
    NM_CMP_RETURN(nmp_object_cmp(obj1->_link.netlink.lnk, obj2->_link.netlink.lnk));

    if (obj1->_link.udev.device != obj2->_link.udev.device) {
        if (!obj1->_link.udev.device)
            return -1;
        if (!obj2->_link.udev.device)
            return 1;

        /* Only compare based on pointer values. That is ugly because it's not a
         * stable sort order.
         *
         * Have this check as very last. */
        return (obj1->_link.udev.device < obj2->_link.udev.device) ? -1 : 1;
    }

    return 0;
}

static int
_vt_cmd_obj_cmp_ip4_route(const NMPObject *obj1, const NMPObject *obj2, gboolean for_id)
{
    int   c;
    guint i;

    c = nm_platform_ip4_route_cmp(&obj1->ip4_route,
                                  &obj2->ip4_route,
                                  for_id ? NM_PLATFORM_IP_ROUTE_CMP_TYPE_ID
                                         : NM_PLATFORM_IP_ROUTE_CMP_TYPE_FULL);
    NM_CMP_RETURN_DIRECT(c);

    for (i = 1u; i < obj1->ip4_route.n_nexthops; i++) {
        c = nm_platform_ip4_rt_nexthop_cmp(&obj1->_ip4_route.extra_nexthops[i - 1u],
                                           &obj2->_ip4_route.extra_nexthops[i - 1u],
                                           for_id);
        NM_CMP_RETURN_DIRECT(c);
    }

    return 0;
}

static int
_vt_cmd_obj_cmp_lnk_vlan(const NMPObject *obj1, const NMPObject *obj2, gboolean for_id)
{
    int c;

    if (for_id) {
        NM_CMP_DIRECT_PTR(obj1, obj2);
        return nm_assert_unreachable_val(0);
    }

    c = nm_platform_lnk_vlan_cmp(&obj1->lnk_vlan, &obj2->lnk_vlan);
    if (c)
        return c;

    if (obj1->_lnk_vlan.n_ingress_qos_map != obj2->_lnk_vlan.n_ingress_qos_map)
        return obj1->_lnk_vlan.n_ingress_qos_map < obj2->_lnk_vlan.n_ingress_qos_map ? -1 : 1;
    if (obj1->_lnk_vlan.n_egress_qos_map != obj2->_lnk_vlan.n_egress_qos_map)
        return obj1->_lnk_vlan.n_egress_qos_map < obj2->_lnk_vlan.n_egress_qos_map ? -1 : 1;

    c = _vlan_xgress_qos_mappings_cmp(obj1->_lnk_vlan.n_ingress_qos_map,
                                      obj1->_lnk_vlan.ingress_qos_map,
                                      obj2->_lnk_vlan.ingress_qos_map);
    if (c)
        return c;
    c = _vlan_xgress_qos_mappings_cmp(obj1->_lnk_vlan.n_egress_qos_map,
                                      obj1->_lnk_vlan.egress_qos_map,
                                      obj2->_lnk_vlan.egress_qos_map);

    return c;
}

static int
_vt_cmd_obj_cmp_lnk_wireguard(const NMPObject *obj1, const NMPObject *obj2, gboolean for_id)
{
    guint i;

    if (for_id) {
        NM_CMP_DIRECT_PTR(obj1, obj2);
        return nm_assert_unreachable_val(0);
    }

    NM_CMP_RETURN(nm_platform_lnk_wireguard_cmp(&obj1->lnk_wireguard, &obj2->lnk_wireguard));

    NM_CMP_FIELD(obj1, obj2, _lnk_wireguard.peers_len);

    for (i = 0; i < obj1->_lnk_wireguard.peers_len; i++)
        NM_CMP_RETURN(
            _wireguard_peer_cmp(&obj1->_lnk_wireguard.peers[i], &obj2->_lnk_wireguard.peers[i]));

    return 0;
}

/* @src is a const object, which is not entirely correct for link types, where
 * we increase the ref count for src->_link.udev.device.
 * Hence, nmp_object_copy() can violate the const promise of @src.
 * */
void
nmp_object_copy(NMPObject *dst, const NMPObject *src, gboolean id_only)
{
    g_return_if_fail(NMP_OBJECT_IS_VALID(dst));
    g_return_if_fail(NMP_OBJECT_IS_VALID(src));
    g_return_if_fail(!NMP_OBJECT_IS_STACKINIT(dst));

    if (src != dst) {
        const NMPClass *klass = NMP_OBJECT_GET_CLASS(dst);

        g_return_if_fail(klass == NMP_OBJECT_GET_CLASS(src));

        if (id_only && klass->cmd_plobj_id_copy)
            klass->cmd_plobj_id_copy(&dst->object, &src->object);
        else if (klass->cmd_obj_copy)
            klass->cmd_obj_copy(dst, src);
        else
            memcpy(&dst->object, &src->object, klass->sizeof_data);
    }
}

static void
_vt_cmd_obj_copy_link(NMPObject *dst, const NMPObject *src)
{
    if (dst->_link.udev.device != src->_link.udev.device) {
        if (src->_link.udev.device)
            udev_device_ref(src->_link.udev.device);
        if (dst->_link.udev.device)
            udev_device_unref(dst->_link.udev.device);
        dst->_link.udev.device = src->_link.udev.device;
    }
    if (dst->_link.netlink.lnk != src->_link.netlink.lnk) {
        if (src->_link.netlink.lnk)
            nmp_object_ref(src->_link.netlink.lnk);
        if (dst->_link.netlink.lnk)
            nmp_object_unref(dst->_link.netlink.lnk);
        dst->_link.netlink.lnk = src->_link.netlink.lnk;
    }
    if (dst->_link.ext_data != src->_link.ext_data) {
        if (dst->_link.ext_data)
            g_clear_object(&dst->_link.ext_data);
        if (src->_link.ext_data)
            dst->_link.ext_data = g_object_ref(src->_link.ext_data);
    }
    dst->_link = src->_link;
}

static void
_vt_cmd_obj_copy_ip4_route(NMPObject *dst, const NMPObject *src)
{
    nm_assert(dst != src);

    if (src->ip4_route.n_nexthops <= 1) {
        nm_clear_g_free((gpointer *) &dst->_ip4_route.extra_nexthops);
    } else if (src->ip4_route.n_nexthops != dst->ip4_route.n_nexthops
               || !nm_memeq_n(src->_ip4_route.extra_nexthops,
                              src->ip4_route.n_nexthops - 1u,
                              dst->_ip4_route.extra_nexthops,
                              dst->ip4_route.n_nexthops - 1u,
                              sizeof(NMPlatformIP4RtNextHop))) {
        nm_clear_g_free((gpointer *) &dst->_ip4_route.extra_nexthops);
        dst->_ip4_route.extra_nexthops =
            nm_memdup(src->_ip4_route.extra_nexthops,
                      sizeof(NMPlatformIP4RtNextHop) * (src->ip4_route.n_nexthops - 1u));
    }

    dst->ip4_route = src->ip4_route;
}

static void
_vt_cmd_obj_copy_lnk_vlan(NMPObject *dst, const NMPObject *src)
{
    dst->lnk_vlan = src->lnk_vlan;
    _vlan_xgress_qos_mappings_cpy(
        &dst->_lnk_vlan.n_ingress_qos_map,
        NM_UNCONST_PPTR(NMVlanQosMapping, &dst->_lnk_vlan.ingress_qos_map),
        src->_lnk_vlan.n_ingress_qos_map,
        src->_lnk_vlan.ingress_qos_map);
    _vlan_xgress_qos_mappings_cpy(&dst->_lnk_vlan.n_egress_qos_map,
                                  NM_UNCONST_PPTR(NMVlanQosMapping, &dst->_lnk_vlan.egress_qos_map),
                                  src->_lnk_vlan.n_egress_qos_map,
                                  src->_lnk_vlan.egress_qos_map);
}

static void
_vt_cmd_obj_copy_lnk_wireguard(NMPObject *dst, const NMPObject *src)
{
    guint i;

    nm_assert(dst != src);

    _wireguard_clear(&dst->_lnk_wireguard);

    dst->_lnk_wireguard = src->_lnk_wireguard;

    dst->_lnk_wireguard.peers = nm_memdup(dst->_lnk_wireguard.peers,
                                          sizeof(NMPWireGuardPeer) * dst->_lnk_wireguard.peers_len);
    dst->_lnk_wireguard._allowed_ips_buf =
        nm_memdup(dst->_lnk_wireguard._allowed_ips_buf,
                  sizeof(NMPWireGuardAllowedIP) * dst->_lnk_wireguard._allowed_ips_buf_len);

    /* all the peers' pointers point into the buffer. They need to be readjusted. */
    for (i = 0; i < dst->_lnk_wireguard.peers_len; i++) {
        NMPWireGuardPeer *peer = (NMPWireGuardPeer *) &dst->_lnk_wireguard.peers[i];

        if (peer->allowed_ips_len == 0) {
            nm_assert(!peer->allowed_ips);
            continue;
        }
        nm_assert(dst->_lnk_wireguard._allowed_ips_buf_len > 0);
        nm_assert(src->_lnk_wireguard._allowed_ips_buf);
        nm_assert(peer->allowed_ips >= src->_lnk_wireguard._allowed_ips_buf);
        nm_assert(
            &peer->allowed_ips[peer->allowed_ips_len]
            <= &src->_lnk_wireguard._allowed_ips_buf[src->_lnk_wireguard._allowed_ips_buf_len]);

        peer->allowed_ips =
            &dst->_lnk_wireguard
                 ._allowed_ips_buf[peer->allowed_ips - src->_lnk_wireguard._allowed_ips_buf];
    }

    nm_assert(nmp_object_equal(src, dst));
}

#define _vt_cmd_plobj_id_copy(type, plat_type, cmd)                                                \
    static void _vt_cmd_plobj_id_copy_##type(NMPlatformObject *_dst, const NMPlatformObject *_src) \
    {                                                                                              \
        plat_type *const       dst = (plat_type *) _dst;                                           \
        const plat_type *const src = (const plat_type *) _src;                                     \
        {                                                                                          \
            cmd                                                                                    \
        }                                                                                          \
    }                                                                                              \
    _NM_DUMMY_STRUCT_FOR_TRAILING_SEMICOLON

_vt_cmd_plobj_id_copy(link, NMPlatformLink, { dst->ifindex = src->ifindex; });

_vt_cmd_plobj_id_copy(ip4_address, NMPlatformIP4Address, {
    dst->ifindex      = src->ifindex;
    dst->plen         = src->plen;
    dst->address      = src->address;
    dst->peer_address = src->peer_address;
});

_vt_cmd_plobj_id_copy(ip6_address, NMPlatformIP6Address, {
    dst->ifindex = src->ifindex;
    dst->address = src->address;
});

/* Uses internally nmp_object_copy(), hence it also violates the const
 * promise for @obj.
 * */
NMPObject *
nmp_object_clone(const NMPObject *obj, gboolean id_only)
{
    NMPObject *dst;

    if (!obj)
        return NULL;

    g_return_val_if_fail(NMP_OBJECT_IS_VALID(obj), NULL);

    dst = _nmp_object_new_from_class(NMP_OBJECT_GET_CLASS(obj));
    nmp_object_copy(dst, obj, id_only);
    return dst;
}

#define _vt_cmd_plobj_id_cmp(type, plat_type, cmd)                        \
    static int _vt_cmd_plobj_id_cmp_##type(const NMPlatformObject *_obj1, \
                                           const NMPlatformObject *_obj2) \
    {                                                                     \
        const plat_type *const obj1 = (const plat_type *) _obj1;          \
        const plat_type *const obj2 = (const plat_type *) _obj2;          \
                                                                          \
        NM_CMP_SELF(obj1, obj2);                                          \
        {                                                                 \
            cmd;                                                          \
        }                                                                 \
        return 0;                                                         \
    }                                                                     \
    _NM_DUMMY_STRUCT_FOR_TRAILING_SEMICOLON

static int
_vt_cmd_plobj_id_cmp_ip4_address(const NMPlatformObject *obj1, const NMPlatformObject *obj2)
{
    return nm_platform_ip4_address_cmp((const NMPlatformIP4Address *) obj1,
                                       (const NMPlatformIP4Address *) obj2,
                                       NM_PLATFORM_IP_ADDRESS_CMP_TYPE_ID);
}

static int
_vt_cmd_plobj_id_cmp_ip6_address(const NMPlatformObject *obj1, const NMPlatformObject *obj2)
{
    return nm_platform_ip6_address_cmp((const NMPlatformIP6Address *) obj1,
                                       (const NMPlatformIP6Address *) obj2,
                                       NM_PLATFORM_IP_ADDRESS_CMP_TYPE_ID);
}

_vt_cmd_plobj_id_cmp(qdisc, NMPlatformQdisc, {
    NM_CMP_FIELD(obj1, obj2, ifindex);
    NM_CMP_FIELD(obj1, obj2, parent);
});

_vt_cmd_plobj_id_cmp(tfilter, NMPlatformTfilter, {
    NM_CMP_FIELD(obj1, obj2, ifindex);
    NM_CMP_FIELD(obj1, obj2, handle);
});

static int
_vt_cmd_plobj_id_cmp_ip6_route(const NMPlatformObject *obj1, const NMPlatformObject *obj2)
{
    return nm_platform_ip6_route_cmp((const NMPlatformIP6Route *) obj1,
                                     (const NMPlatformIP6Route *) obj2,
                                     NM_PLATFORM_IP_ROUTE_CMP_TYPE_ID);
}

static int
_vt_cmd_plobj_id_cmp_routing_rule(const NMPlatformObject *obj1, const NMPlatformObject *obj2)
{
    return nm_platform_routing_rule_cmp((const NMPlatformRoutingRule *) obj1,
                                        (const NMPlatformRoutingRule *) obj2,
                                        NM_PLATFORM_ROUTING_RULE_CMP_TYPE_ID);
}

_vt_cmd_plobj_id_cmp(mptcp_addr, NMPlatformMptcpAddr, {
    /* The primary key of an MPTCP endpoint is only the address:port@ifindex.
     *
     * Which does not fully correspond to kernel's view. Kernel's view is determined
     * by the question whether you can add two objects that only differ by one
     * attribute. If you can, the attribute is part of the ID otherwise it isn't.
     *
     * Note that for kernel, the "ifindex" is not part of the identity.
     * That is, you cannot two add two endpoints that only differ by
     * ifindex. However, for our purpose, it is very useful to make
     * the "ifindex" part of the identity. For example, NMPGlobalTracker will use
     * this to track MPTCP addresses from independent callers (NML3Cfg).
     * It would be bad, if objects that differ by "ifindex" would be
     * combined.
     *
     * The "id" is intentionally not part of the identity for us. Note however, that kernel
     * does not allow configuring duplicates "id" -- so the "id" could be a primary key
     * as far as kernel is concerned. However, when we track MPTCP endpoints that
     * we want to configure, the "id" is left undefined (and we let kernel choose it).
     * If the "id" would be part of the NMPObject's ID, we could not lookup
     * an object unless we know the "id" -- which we often don't.
     */
    NM_CMP_FIELD(obj1, obj2, ifindex);
    NM_CMP_FIELD(obj1, obj2, addr_family);
    NM_CMP_FIELD_MEMCMP_LEN(obj1,
                            obj2,
                            addr,
                            nm_utils_addr_family_to_size_untrusted(obj1->addr_family));
    NM_CMP_FIELD(obj1, obj2, port);
});

guint
nmp_object_id_hash(const NMPObject *obj)
{
    NMHashState h;

    if (!obj)
        return nm_hash_static(914932607u);

    nm_hash_init(&h, 914932607u);
    nmp_object_id_hash_update(obj, &h);
    return nm_hash_complete(&h);
}

#define _vt_cmd_plobj_id_hash_update(type, plat_type, cmd)                                        \
    static void _vt_cmd_plobj_id_hash_update_##type(const NMPlatformObject *_obj, NMHashState *h) \
    {                                                                                             \
        const plat_type *const obj = (const plat_type *) _obj;                                    \
        {                                                                                         \
            cmd;                                                                                  \
        }                                                                                         \
    }                                                                                             \
    _NM_DUMMY_STRUCT_FOR_TRAILING_SEMICOLON

_vt_cmd_plobj_id_hash_update(ip4_address, NMPlatformIP4Address, {
    nm_hash_update_vals(
        h,
        obj->ifindex,
        obj->plen,
        obj->address,
        /* for IPv4 we must also consider the net-part of the peer-address (IFA_ADDRESS) */
        nm_ip4_addr_clear_host_address(obj->peer_address, obj->plen));
});

_vt_cmd_plobj_id_hash_update(ip6_address, NMPlatformIP6Address, {
    nm_hash_update_vals(
        h,
        obj->ifindex,
        /* for IPv6 addresses, the prefix length is not part of the primary identifier. */
        obj->address);
});

_vt_cmd_plobj_id_hash_update(ip6_route, NMPlatformIP6Route, {
    nm_platform_ip6_route_hash_update(obj, NM_PLATFORM_IP_ROUTE_CMP_TYPE_ID, h);
});

_vt_cmd_plobj_id_hash_update(routing_rule, NMPlatformRoutingRule, {
    nm_platform_routing_rule_hash_update(obj, NM_PLATFORM_ROUTING_RULE_CMP_TYPE_ID, h);
});

_vt_cmd_plobj_id_hash_update(qdisc, NMPlatformQdisc, {
    nm_hash_update_vals(h, obj->ifindex, obj->parent);
});

_vt_cmd_plobj_id_hash_update(tfilter, NMPlatformTfilter, {
    nm_hash_update_vals(h, obj->ifindex, obj->handle);
});

_vt_cmd_plobj_id_hash_update(mptcp_addr, NMPlatformMptcpAddr, {
    /* See the corresponding ID cmp function for details. */
    nm_hash_update_vals(h, obj->addr_family, obj->port, obj->ifindex);
    nm_hash_update(h, &obj->addr, nm_utils_addr_family_to_size_untrusted(obj->addr_family));
});

static void
_vt_cmd_plobj_hash_update_ip6_route(const NMPlatformObject *obj, NMHashState *h)
{
    return nm_platform_ip6_route_hash_update((const NMPlatformIP6Route *) obj,
                                             NM_PLATFORM_IP_ROUTE_CMP_TYPE_FULL,
                                             h);
}

static int
_vt_cmd_plobj_cmp_ip6_route(const NMPlatformObject *obj1, const NMPlatformObject *obj2)
{
    return nm_platform_ip6_route_cmp((const NMPlatformIP6Route *) obj1,
                                     (const NMPlatformIP6Route *) obj2,
                                     NM_PLATFORM_IP_ROUTE_CMP_TYPE_FULL);
}

static void
_vt_cmd_plobj_hash_update_routing_rule(const NMPlatformObject *obj, NMHashState *h)
{
    return nm_platform_routing_rule_hash_update((const NMPlatformRoutingRule *) obj,
                                                NM_PLATFORM_ROUTING_RULE_CMP_TYPE_FULL,
                                                h);
}

static inline int
_vt_cmd_plobj_cmp_routing_rule(const NMPlatformObject *obj1, const NMPlatformObject *obj2)
{
    return nm_platform_routing_rule_cmp((const NMPlatformRoutingRule *) obj1,
                                        (const NMPlatformRoutingRule *) obj2,
                                        NM_PLATFORM_ROUTING_RULE_CMP_TYPE_FULL);
}

static int
_vt_cmd_plobj_cmp_qdisc(const NMPlatformObject *obj1, const NMPlatformObject *obj2)
{
    return nm_platform_qdisc_cmp((const NMPlatformQdisc *) obj1,
                                 (const NMPlatformQdisc *) obj2,
                                 TRUE);
}

/*****************************************************************************/

guint
nmp_object_indirect_id_hash(gconstpointer a)
{
    const NMPObject *const *p_obj = a;

    return nmp_object_id_hash(*p_obj);
}

gboolean
nmp_object_indirect_id_equal(gconstpointer a, gconstpointer b)
{
    const NMPObject *const *p_obj_a = a;
    const NMPObject *const *p_obj_b = b;

    return nmp_object_id_equal(*p_obj_a, *p_obj_b);
}

/*****************************************************************************/

gboolean
nmp_object_is_alive(const NMPObject *obj)
{
    const NMPClass *klass;

    /* for convenience, allow NULL. */
    if (!obj)
        return FALSE;

    klass = NMP_OBJECT_GET_CLASS(obj);
    return !klass->cmd_obj_is_alive || klass->cmd_obj_is_alive(obj);
}

static gboolean
_vt_cmd_obj_is_alive_link(const NMPObject *obj)
{
    return NMP_OBJECT_CAST_LINK(obj)->ifindex > 0
           && (obj->_link.netlink.is_in_netlink || obj->_link.udev.device);
}

static gboolean
_vt_cmd_obj_is_alive_ipx_address(const NMPObject *obj)
{
    return NMP_OBJECT_CAST_IP_ADDRESS(obj)->ifindex > 0;
}

static gboolean
_vt_cmd_obj_is_alive_ipx_route(const NMPObject *obj)
{
    /* We want to ignore routes that are RTM_F_CLONED but we still
     * let nmp_object_from_nl() create such route objects, instead of
     * returning NULL right away.
     *
     * The idea is, that if we have the same route (according to its id)
     * in the cache with !RTM_F_CLONED, an update that changes the route
     * to be RTM_F_CLONED must remove the instance.
     *
     * If nmp_object_from_nl() would just return NULL, we couldn't look
     * into the cache to see if it contains a route that now disappears
     * (because it changed to be cloned).
     *
     * Instead we create a dead object, and nmp_cache_update_netlink()
     * will remove the old version of the update.
     **/
    return !NM_FLAGS_HAS(NMP_OBJECT_CAST_IP_ROUTE(obj)->r_rtm_flags, RTM_F_CLONED);
}

static gboolean
_vt_cmd_obj_is_alive_routing_rule(const NMPObject *obj)
{
    return NM_IN_SET(obj->routing_rule.addr_family, AF_INET, AF_INET6);
}

static gboolean
_vt_cmd_obj_is_alive_qdisc(const NMPObject *obj)
{
    return NMP_OBJECT_CAST_QDISC(obj)->ifindex > 0;
}

static gboolean
_vt_cmd_obj_is_alive_tfilter(const NMPObject *obj)
{
    return NMP_OBJECT_CAST_TFILTER(obj)->ifindex > 0;
}

static gboolean
_vt_cmd_obj_is_alive_mptcp_addr(const NMPObject *obj)
{
    return NM_IN_SET(obj->mptcp_addr.addr_family, AF_INET, AF_INET6, AF_UNSPEC);
}

gboolean
nmp_object_is_visible(const NMPObject *obj)
{
    const NMPClass *klass;

    /* for convenience, allow NULL. */
    if (!obj)
        return FALSE;

    klass = NMP_OBJECT_GET_CLASS(obj);

    /* a dead object is never visible. */
    if (klass->cmd_obj_is_alive && !klass->cmd_obj_is_alive(obj))
        return FALSE;

    return !klass->cmd_obj_is_visible || klass->cmd_obj_is_visible(obj);
}

static gboolean
_vt_cmd_obj_is_visible_link(const NMPObject *obj)
{
    return obj->_link.netlink.is_in_netlink && obj->link.name[0];
}

/*****************************************************************************/

static const guint8 _supported_cache_ids_object[] = {
    NMP_CACHE_ID_TYPE_OBJECT_TYPE,
    NMP_CACHE_ID_TYPE_OBJECT_BY_IFINDEX,
    0,
};

static const guint8 _supported_cache_ids_link[] = {
    NMP_CACHE_ID_TYPE_OBJECT_TYPE,
    NMP_CACHE_ID_TYPE_LINK_BY_IFNAME,
    0,
};

static const guint8 _supported_cache_ids_ipx_address[] = {
    NMP_CACHE_ID_TYPE_OBJECT_TYPE,
    NMP_CACHE_ID_TYPE_OBJECT_BY_IFINDEX,
    0,
};

static const guint8 _supported_cache_ids_ipx_route[] = {
    NMP_CACHE_ID_TYPE_OBJECT_TYPE,
    NMP_CACHE_ID_TYPE_OBJECT_BY_IFINDEX,
    NMP_CACHE_ID_TYPE_DEFAULT_ROUTES,
    NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID,
    0,
};

static const guint8 _supported_cache_ids_routing_rules[] = {
    NMP_CACHE_ID_TYPE_OBJECT_TYPE,
    NMP_CACHE_ID_TYPE_OBJECT_BY_ADDR_FAMILY,
    0,
};

/*****************************************************************************/

static void
_vt_dedup_obj_destroy(NMDedupMultiObj *obj)
{
    NMPObject      *o = (NMPObject *) obj;
    const NMPClass *klass;

    nm_assert(o->parent._ref_count == 0);
    nm_assert(!o->parent._multi_idx);

    klass = o->_class;
    if (klass->cmd_obj_dispose)
        klass->cmd_obj_dispose(o);
    g_slice_free1(_NMP_OBJECT_STRUCT_SIZE(klass), o);
}

static const NMDedupMultiObj *
_vt_dedup_obj_clone(const NMDedupMultiObj *obj)
{
    return (const NMDedupMultiObj *) nmp_object_clone((const NMPObject *) obj, FALSE);
}

#define DEDUP_MULTI_OBJ_CLASS_INIT()                                                       \
    {                                                                                      \
        .obj_clone = _vt_dedup_obj_clone, .obj_destroy = _vt_dedup_obj_destroy,            \
        .obj_full_hash_update =                                                            \
            (void (*)(const NMDedupMultiObj *obj, NMHashState *h)) nmp_object_hash_update, \
        .obj_full_equal = (gboolean(*)(const NMDedupMultiObj *obj_a,                       \
                                       const NMDedupMultiObj *obj_b)) nmp_object_equal,    \
    }

/*****************************************************************************/

static NMDedupMultiIdxType *
_idx_type_get(const NMPCache *cache, NMPCacheIdType cache_id_type)
{
    nm_assert(cache);
    nm_assert(cache_id_type > NMP_CACHE_ID_TYPE_NONE);
    nm_assert(cache_id_type <= NMP_CACHE_ID_TYPE_MAX);
    nm_assert((int) cache_id_type - 1 >= 0);
    nm_assert((int) cache_id_type - 1 < G_N_ELEMENTS(cache->idx_types));

    return (NMDedupMultiIdxType *) &cache->idx_types[cache_id_type - 1];
}

gboolean
nmp_cache_use_udev_get(const NMPCache *cache)
{
    g_return_val_if_fail(cache, TRUE);

    return cache->use_udev;
}

/*****************************************************************************/

gboolean
nmp_cache_link_connected_for_slave(int ifindex_master, const NMPObject *slave)
{
    nm_assert(NMP_OBJECT_GET_TYPE(slave) == NMP_OBJECT_TYPE_LINK);

    return ifindex_master > 0 && slave->link.master == ifindex_master && slave->link.connected
           && nmp_object_is_visible(slave);
}

/**
 * nmp_cache_link_connected_needs_toggle:
 * @cache: the platform cache
 * @master: the link object, that is checked whether its connected property
 *   needs to be toggled.
 * @potential_slave: (allow-none): an additional link object that is treated
 *   as if it was inside @cache. If given, it shaddows a link in the cache
 *   with the same ifindex.
 * @ignore_slave: (allow-none): if set, the check will pretend that @ignore_slave
 *   is not in the cache.
 *
 * NMPlatformLink has two connected flags: (master->link.flags&IFF_LOWER_UP) (as reported
 * from netlink) and master->link.connected. For bond and bridge master, kernel reports
 * those links as IFF_LOWER_UP if they have no slaves attached. We want to present instead
 * a combined @connected flag that shows masters without slaves as down.
 *
 * Check if the connected flag of @master should be toggled according to the content
 * of @cache (including @potential_slave).
 *
 * Returns: %TRUE, if @master->link.connected should be flipped/toggled.
 **/
gboolean
nmp_cache_link_connected_needs_toggle(const NMPCache  *cache,
                                      const NMPObject *master,
                                      const NMPObject *potential_slave,
                                      const NMPObject *ignore_slave)
{
    gboolean is_lower_up = FALSE;

    if (!master || NMP_OBJECT_GET_TYPE(master) != NMP_OBJECT_TYPE_LINK || master->link.ifindex <= 0
        || !nmp_object_is_visible(master)
        || !NM_IN_SET(master->link.type, NM_LINK_TYPE_BRIDGE, NM_LINK_TYPE_BOND))
        return FALSE;

    /* if native IFF_LOWER_UP is down, link.connected must also be down
     * regardless of the slaves. */
    if (!NM_FLAGS_HAS(master->link.n_ifi_flags, IFF_LOWER_UP))
        return !!master->link.connected;

    if (potential_slave && NMP_OBJECT_GET_TYPE(potential_slave) != NMP_OBJECT_TYPE_LINK)
        potential_slave = NULL;

    if (potential_slave
        && nmp_cache_link_connected_for_slave(master->link.ifindex, potential_slave))
        is_lower_up = TRUE;
    else {
        NMPLookup             lookup;
        NMDedupMultiIter      iter;
        const NMPlatformLink *link = NULL;

        nmp_cache_iter_for_each_link (
            &iter,
            nmp_cache_lookup(cache, nmp_lookup_init_obj_type(&lookup, NMP_OBJECT_TYPE_LINK)),
            &link) {
            const NMPObject *obj = NMP_OBJECT_UP_CAST((NMPlatformObject *) link);

            if ((!potential_slave || potential_slave->link.ifindex != link->ifindex)
                && ignore_slave != obj
                && nmp_cache_link_connected_for_slave(master->link.ifindex, obj)) {
                is_lower_up = TRUE;
                break;
            }
        }
    }
    return !!master->link.connected != is_lower_up;
}

/**
 * nmp_cache_link_connected_needs_toggle_by_ifindex:
 * @cache:
 * @master_ifindex: the ifindex of a potential master that should be checked
 *   whether it needs toggling.
 * @potential_slave: (allow-none): passed to nmp_cache_link_connected_needs_toggle().
 *   It considers @potential_slave as being inside the cache, replacing an existing
 *   link with the same ifindex.
 * @ignore_slave: (allow-onne): passed to nmp_cache_link_connected_needs_toggle().
 *
 * The flag obj->link.connected depends on the state of other links in the
 * @cache. See also nmp_cache_link_connected_needs_toggle(). Given an ifindex
 * of a master, check if the cache contains such a master link that needs
 * toggling of the connected flag.
 *
 * Returns: NULL if there is no master link with ifindex @master_ifindex that should be toggled.
 *   Otherwise, return the link object from inside the cache with the given ifindex.
 *   The connected flag of that master should be toggled.
 */
const NMPObject *
nmp_cache_link_connected_needs_toggle_by_ifindex(const NMPCache  *cache,
                                                 int              master_ifindex,
                                                 const NMPObject *potential_slave,
                                                 const NMPObject *ignore_slave)
{
    const NMPObject *master;

    if (master_ifindex > 0) {
        master = nmp_cache_lookup_link(cache, master_ifindex);
        if (nmp_cache_link_connected_needs_toggle(cache, master, potential_slave, ignore_slave))
            return master;
    }
    return NULL;
}

/*****************************************************************************/

static const NMDedupMultiEntry *
_lookup_entry_with_idx_type(const NMPCache  *cache,
                            NMPCacheIdType   cache_id_type,
                            const NMPObject *obj)
{
    const NMDedupMultiEntry *entry;

    nm_assert(cache);
    nm_assert(NMP_OBJECT_IS_VALID(obj));

    entry =
        nm_dedup_multi_index_lookup_obj(cache->multi_idx, _idx_type_get(cache, cache_id_type), obj);
    nm_assert(!entry
              || (NMP_OBJECT_IS_VALID(entry->obj)
                  && NMP_OBJECT_GET_CLASS(entry->obj) == NMP_OBJECT_GET_CLASS(obj)));
    return entry;
}

static const NMDedupMultiEntry *
_lookup_entry(const NMPCache *cache, const NMPObject *obj)
{
    return _lookup_entry_with_idx_type(cache, NMP_CACHE_ID_TYPE_OBJECT_TYPE, obj);
}

const NMDedupMultiEntry *
nmp_cache_lookup_entry_with_idx_type(const NMPCache  *cache,
                                     NMPCacheIdType   cache_id_type,
                                     const NMPObject *obj)
{
    g_return_val_if_fail(cache, NULL);
    g_return_val_if_fail(obj, NULL);
    g_return_val_if_fail(cache_id_type > NMP_CACHE_ID_TYPE_NONE
                             && cache_id_type <= NMP_CACHE_ID_TYPE_MAX,
                         NULL);

    return _lookup_entry_with_idx_type(cache, cache_id_type, obj);
}

const NMDedupMultiEntry *
nmp_cache_lookup_entry(const NMPCache *cache, const NMPObject *obj)
{
    g_return_val_if_fail(cache, NULL);
    g_return_val_if_fail(obj, NULL);

    return _lookup_entry(cache, obj);
}

const NMDedupMultiEntry *
nmp_cache_lookup_entry_link(const NMPCache *cache, int ifindex)
{
    NMPObject obj_needle;

    g_return_val_if_fail(cache, NULL);
    g_return_val_if_fail(ifindex > 0, NULL);

    nmp_object_stackinit_id_link(&obj_needle, ifindex);
    return _lookup_entry(cache, &obj_needle);
}

const NMPObject *
nmp_cache_lookup_obj(const NMPCache *cache, const NMPObject *obj)
{
    return nm_dedup_multi_entry_get_obj(nmp_cache_lookup_entry(cache, obj));
}

const NMPObject *
nmp_cache_lookup_link(const NMPCache *cache, int ifindex)
{
    return nm_dedup_multi_entry_get_obj(nmp_cache_lookup_entry_link(cache, ifindex));
}

/*****************************************************************************/

const NMDedupMultiHeadEntry *
nmp_cache_lookup_all(const NMPCache  *cache,
                     NMPCacheIdType   cache_id_type,
                     const NMPObject *select_obj)
{
    nm_assert(cache);
    nm_assert(NMP_OBJECT_IS_VALID(select_obj));

    return nm_dedup_multi_index_lookup_head(cache->multi_idx,
                                            _idx_type_get(cache, cache_id_type),
                                            select_obj);
}

static const NMPLookup *
_L(const NMPLookup *lookup)
{
#if NM_MORE_ASSERTS
    DedupMultiIdxType idx_type;

    nm_assert(lookup);
    _dedup_multi_idx_type_init(&idx_type, lookup->cache_id_type);
    nm_assert(
        idx_type.parent.klass->idx_obj_partitionable((NMDedupMultiIdxType *) &idx_type,
                                                     (NMDedupMultiObj *) &lookup->selector_obj));
#endif
    return lookup;
}

const NMPLookup *
nmp_lookup_init_obj_type(NMPLookup *lookup, NMPObjectType obj_type)
{
    nm_assert(lookup);

    switch (obj_type) {
    default:
        nm_assert_not_reached();
        /* fall-through */
    case NMP_OBJECT_TYPE_LINK:
    case NMP_OBJECT_TYPE_IP4_ADDRESS:
    case NMP_OBJECT_TYPE_IP6_ADDRESS:
    case NMP_OBJECT_TYPE_IP4_ROUTE:
    case NMP_OBJECT_TYPE_IP6_ROUTE:
    case NMP_OBJECT_TYPE_ROUTING_RULE:
    case NMP_OBJECT_TYPE_QDISC:
    case NMP_OBJECT_TYPE_TFILTER:
    case NMP_OBJECT_TYPE_MPTCP_ADDR:
        _nmp_object_stackinit_from_type(&lookup->selector_obj, obj_type);
        lookup->cache_id_type = NMP_CACHE_ID_TYPE_OBJECT_TYPE;
        return _L(lookup);
    }
}

const NMPLookup *
nmp_lookup_init_link_by_ifname(NMPLookup *lookup, const char *ifname)
{
    NMPObject *o;

    nm_assert(lookup);
    nm_assert(ifname);
    nm_assert(strlen(ifname) < IFNAMSIZ);

    o = _nmp_object_stackinit_from_type(&lookup->selector_obj, NMP_OBJECT_TYPE_LINK);
    if (g_strlcpy(o->link.name, ifname, sizeof(o->link.name)) >= sizeof(o->link.name))
        nm_assert_not_reached();
    lookup->cache_id_type = NMP_CACHE_ID_TYPE_LINK_BY_IFNAME;
    return _L(lookup);
}

const NMPLookup *
nmp_lookup_init_object_by_ifindex(NMPLookup *lookup, NMPObjectType obj_type, int ifindex)
{
    NMPObject *o;

    nm_assert(lookup);
    nm_assert(NM_IN_SET(obj_type,
                        NMP_OBJECT_TYPE_IP4_ADDRESS,
                        NMP_OBJECT_TYPE_IP6_ADDRESS,
                        NMP_OBJECT_TYPE_IP4_ROUTE,
                        NMP_OBJECT_TYPE_IP6_ROUTE,
                        NMP_OBJECT_TYPE_QDISC,
                        NMP_OBJECT_TYPE_TFILTER,
                        NMP_OBJECT_TYPE_MPTCP_ADDR));
    nm_assert(ifindex > 0
              || (ifindex == 0
                  && NM_IN_SET(obj_type, NMP_OBJECT_TYPE_IP4_ROUTE, NMP_OBJECT_TYPE_IP6_ROUTE)));

    o                           = _nmp_object_stackinit_from_type(&lookup->selector_obj, obj_type);
    o->obj_with_ifindex.ifindex = ifindex;
    lookup->cache_id_type       = NMP_CACHE_ID_TYPE_OBJECT_BY_IFINDEX;
    return _L(lookup);
}

const NMPLookup *
nmp_lookup_init_route_default(NMPLookup *lookup, NMPObjectType obj_type)
{
    NMPObject *o;

    nm_assert(lookup);
    nm_assert(NM_IN_SET(obj_type, NMP_OBJECT_TYPE_IP4_ROUTE, NMP_OBJECT_TYPE_IP6_ROUTE));

    o                     = _nmp_object_stackinit_from_type(&lookup->selector_obj, obj_type);
    o->ip_route.ifindex   = 1;
    lookup->cache_id_type = NMP_CACHE_ID_TYPE_DEFAULT_ROUTES;
    return _L(lookup);
}

const NMPLookup *
nmp_lookup_init_route_by_weak_id(NMPLookup *lookup, const NMPObject *obj)
{
    const NMPlatformIP4Route *r4;
    const NMPlatformIP6Route *r6;

    nm_assert(lookup);

    switch (NMP_OBJECT_GET_TYPE(obj)) {
    case NMP_OBJECT_TYPE_IP4_ROUTE:
        r4 = NMP_OBJECT_CAST_IP4_ROUTE(obj);
        return nmp_lookup_init_ip4_route_by_weak_id(
            lookup,
            nm_platform_route_table_uncoerce(r4->table_coerced, TRUE),
            r4->network,
            r4->plen,
            r4->metric,
            r4->tos);
    case NMP_OBJECT_TYPE_IP6_ROUTE:
        r6 = NMP_OBJECT_CAST_IP6_ROUTE(obj);
        return nmp_lookup_init_ip6_route_by_weak_id(
            lookup,
            nm_platform_route_table_uncoerce(r6->table_coerced, TRUE),
            &r6->network,
            r6->plen,
            r6->metric,
            &r6->src,
            r6->src_plen);
    default:
        nm_assert_not_reached();
        return NULL;
    }
}

const NMPLookup *
nmp_lookup_init_ip4_route_by_weak_id(NMPLookup *lookup,
                                     guint32    route_table,
                                     in_addr_t  network,
                                     guint      plen,
                                     guint32    metric,
                                     guint8     tos)
{
    NMPObject *o;

    nm_assert(lookup);

    o = _nmp_object_stackinit_from_type(&lookup->selector_obj, NMP_OBJECT_TYPE_IP4_ROUTE);
    o->ip4_route.ifindex       = 1;
    o->ip4_route.plen          = plen;
    o->ip4_route.table_coerced = nm_platform_route_table_coerce(route_table);
    o->ip4_route.metric        = metric;
    if (network)
        o->ip4_route.network = network;
    o->ip4_route.tos      = tos;
    lookup->cache_id_type = NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID;
    return _L(lookup);
}

const NMPLookup *
nmp_lookup_init_ip6_route_by_weak_id(NMPLookup             *lookup,
                                     guint32                route_table,
                                     const struct in6_addr *network,
                                     guint                  plen,
                                     guint32                metric,
                                     const struct in6_addr *src,
                                     guint8                 src_plen)
{
    NMPObject *o;

    nm_assert(lookup);

    o = _nmp_object_stackinit_from_type(&lookup->selector_obj, NMP_OBJECT_TYPE_IP6_ROUTE);
    o->ip6_route.ifindex       = 1;
    o->ip6_route.plen          = plen;
    o->ip6_route.table_coerced = nm_platform_route_table_coerce(route_table);
    o->ip6_route.metric        = metric;
    if (network)
        o->ip6_route.network = *network;
    if (src)
        o->ip6_route.src = *src;
    o->ip6_route.src_plen = src_plen;
    lookup->cache_id_type = NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID;
    return _L(lookup);
}

const NMPLookup *
nmp_lookup_init_object_by_addr_family(NMPLookup *lookup, NMPObjectType obj_type, int addr_family)
{
    NMPObject *o;

    nm_assert(lookup);
    nm_assert(NM_IN_SET(obj_type, NMP_OBJECT_TYPE_ROUTING_RULE));

    if (addr_family == AF_UNSPEC)
        return nmp_lookup_init_obj_type(lookup, obj_type);

    nm_assert_addr_family(addr_family);
    o = _nmp_object_stackinit_from_type(&lookup->selector_obj, obj_type);
    NMP_OBJECT_CAST_ROUTING_RULE(o)->addr_family = addr_family;
    lookup->cache_id_type                        = NMP_CACHE_ID_TYPE_OBJECT_BY_ADDR_FAMILY;
    return _L(lookup);
}

/*****************************************************************************/

GArray *
nmp_cache_lookup_to_array(const NMDedupMultiHeadEntry *head_entry,
                          NMPObjectType                obj_type,
                          gboolean                     visible_only)
{
    const NMPClass  *klass = nmp_class_from_type(obj_type);
    NMDedupMultiIter iter;
    const NMPObject *o;
    GArray          *array;

    g_return_val_if_fail(klass, NULL);

    array = g_array_sized_new(FALSE, FALSE, klass->sizeof_public, head_entry ? head_entry->len : 0);
    nmp_cache_iter_for_each (&iter, head_entry, &o) {
        nm_assert(NMP_OBJECT_GET_CLASS(o) == klass);
        if (visible_only && !nmp_object_is_visible(o))
            continue;
        g_array_append_vals(array, &o->object, 1);
    }
    return array;
}

/*****************************************************************************/

const NMPObject *
nmp_cache_lookup_link_full(const NMPCache  *cache,
                           int              ifindex,
                           const char      *ifname,
                           gboolean         visible_only,
                           NMLinkType       link_type,
                           NMPObjectMatchFn match_fn,
                           gpointer         user_data)
{
    NMPObject                    obj_needle;
    const NMPObject             *obj;
    NMDedupMultiIter             iter;
    const NMDedupMultiHeadEntry *head_entry;
    const NMPlatformLink        *link = NULL;
    NMPLookup                    lookup;

    if (ifindex > 0) {
        obj = nmp_cache_lookup_obj(cache, nmp_object_stackinit_id_link(&obj_needle, ifindex));

        if (!obj || (visible_only && !nmp_object_is_visible(obj))
            || (link_type != NM_LINK_TYPE_NONE && obj->link.type != link_type)
            || (ifname && strcmp(obj->link.name, ifname))
            || (match_fn && !match_fn(obj, user_data)))
            return NULL;
        return obj;
    } else if (!ifname && !match_fn)
        return NULL;
    else {
        const NMPObject *obj_best = NULL;

        if (ifname) {
            if (strlen(ifname) >= IFNAMSIZ)
                return NULL;
            nmp_lookup_init_link_by_ifname(&lookup, ifname);
        } else
            nmp_lookup_init_obj_type(&lookup, NMP_OBJECT_TYPE_LINK);

        head_entry = nmp_cache_lookup(cache, &lookup);
        nmp_cache_iter_for_each_link (&iter, head_entry, &link) {
            obj = NMP_OBJECT_UP_CAST(link);

            if (link_type != NM_LINK_TYPE_NONE && obj->link.type != link_type)
                continue;
            if (visible_only && !nmp_object_is_visible(obj))
                continue;
            if (match_fn && !match_fn(obj, user_data))
                continue;

            /* if there are multiple candidates, prefer the visible ones. */
            if (visible_only || nmp_object_is_visible(obj))
                return obj;
            if (!obj_best)
                obj_best = obj;
        }
        return obj_best;
    }
}

/*****************************************************************************/

static NMDedupMultiIdxMode
_obj_get_add_mode(const NMPObject *obj)
{
    /* new objects are usually appended to the list. Except for
     * addresses, which are prepended during `ip address add`.
     *
     * Actually, for routes it is more complicated, because depending on
     * `ip route append`, `ip route replace`, `ip route prepend`, the object
     * will be added at the tail, at the front, or even replace an element
     * in the list. However, that is handled separately by nmp_cache_update_netlink_route()
     * and of no concern here. */
    if (NM_IN_SET(NMP_OBJECT_GET_TYPE(obj),
                  NMP_OBJECT_TYPE_IP4_ADDRESS,
                  NMP_OBJECT_TYPE_IP6_ADDRESS))
        return NM_DEDUP_MULTI_IDX_MODE_PREPEND;
    return NM_DEDUP_MULTI_IDX_MODE_APPEND;
}

static void
_idxcache_update_order_for_dump(NMPCache *cache, const NMDedupMultiEntry *entry)
{
    const NMPClass          *klass;
    const guint8            *i_idx_type;
    const NMDedupMultiEntry *entry2;

    nm_dedup_multi_entry_reorder(entry, NULL, TRUE);

    klass = NMP_OBJECT_GET_CLASS(entry->obj);
    for (i_idx_type = klass->supported_cache_ids; *i_idx_type; i_idx_type++) {
        NMPCacheIdType id_type = *i_idx_type;

        if (id_type == NMP_CACHE_ID_TYPE_OBJECT_TYPE)
            continue;

        entry2 = nm_dedup_multi_index_lookup_obj(cache->multi_idx,
                                                 _idx_type_get(cache, id_type),
                                                 entry->obj);
        if (!entry2)
            continue;

        nm_assert(entry2 != entry);
        nm_assert(entry2->obj == entry->obj);

        nm_dedup_multi_entry_reorder(entry2, NULL, TRUE);
    }
}

static void
_idxcache_update_other_cache_ids(NMPCache        *cache,
                                 NMPCacheIdType   cache_id_type,
                                 const NMPObject *obj_old,
                                 const NMPObject *obj_new,
                                 gboolean         is_dump)
{
    const NMDedupMultiEntry *entry_new;
    const NMDedupMultiEntry *entry_old;
    const NMDedupMultiEntry *entry_order;
    NMDedupMultiIdxType     *idx_type;

    nm_assert(obj_new || obj_old);
    nm_assert(!obj_new || NMP_OBJECT_GET_TYPE(obj_new) != NMP_OBJECT_TYPE_UNKNOWN);
    nm_assert(!obj_old || NMP_OBJECT_GET_TYPE(obj_old) != NMP_OBJECT_TYPE_UNKNOWN);
    nm_assert(!obj_old || !obj_new
              || NMP_OBJECT_GET_CLASS(obj_new) == NMP_OBJECT_GET_CLASS(obj_old));
    nm_assert(!obj_old || !obj_new || !nmp_object_equal(obj_new, obj_old));
    nm_assert(!obj_new || obj_new == nm_dedup_multi_index_obj_find(cache->multi_idx, obj_new));
    nm_assert(!obj_old || obj_old == nm_dedup_multi_index_obj_find(cache->multi_idx, obj_old));

    idx_type = _idx_type_get(cache, cache_id_type);

    if (obj_old) {
        entry_old = nm_dedup_multi_index_lookup_obj(cache->multi_idx, idx_type, obj_old);
        if (!obj_new) {
            if (entry_old)
                nm_dedup_multi_index_remove_entry(cache->multi_idx, entry_old);
            return;
        }
    } else
        entry_old = NULL;

    if (obj_new) {
        if (obj_old && nm_dedup_multi_idx_type_id_equal(idx_type, obj_old, obj_new)
            && nm_dedup_multi_idx_type_partition_equal(idx_type, obj_old, obj_new)) {
            /* optimize. We just looked up the @obj_old entry and @obj_new compares equal
             * according to idx_obj_id_equal(). entry_new is the same as entry_old. */
            entry_new = entry_old;
        } else {
            entry_new = nm_dedup_multi_index_lookup_obj(cache->multi_idx, idx_type, obj_new);
        }

        if (entry_new)
            entry_order = entry_new;
        else if (entry_old
                 && nm_dedup_multi_idx_type_partition_equal(idx_type, entry_old->obj, obj_new))
            entry_order = entry_old;
        else
            entry_order = NULL;
        nm_dedup_multi_index_add_full(
            cache->multi_idx,
            idx_type,
            obj_new,
            is_dump ? NM_DEDUP_MULTI_IDX_MODE_APPEND_FORCE : _obj_get_add_mode(obj_new),
            is_dump ? NULL : entry_order,
            entry_new ?: NM_DEDUP_MULTI_ENTRY_MISSING,
            entry_new ? entry_new->head : (entry_order ? entry_order->head : NULL),
            &entry_new,
            NULL);

#if NM_MORE_ASSERTS
        if (entry_new) {
            nm_assert(idx_type->klass->idx_obj_partitionable);
            nm_assert(idx_type->klass->idx_obj_partition_equal);
            nm_assert(idx_type->klass->idx_obj_partitionable(idx_type, entry_new->obj));
            nm_assert(idx_type->klass->idx_obj_partition_equal(idx_type,
                                                               (gpointer) obj_new,
                                                               entry_new->obj));
        }
#endif
    } else
        entry_new = NULL;

    if (entry_old && entry_old != entry_new)
        nm_dedup_multi_index_remove_entry(cache->multi_idx, entry_old);
}

static void
_idxcache_update(NMPCache                 *cache,
                 const NMDedupMultiEntry  *entry_old,
                 NMPObject                *obj_new,
                 gboolean                  is_dump,
                 const NMDedupMultiEntry **out_entry_new)
{
    const NMPClass          *klass;
    const guint8            *i_idx_type;
    NMDedupMultiIdxType     *idx_type_o     = _idx_type_get(cache, NMP_CACHE_ID_TYPE_OBJECT_TYPE);
    const NMDedupMultiEntry *entry_new      = NULL;
    nm_auto_nmpobj const NMPObject *obj_old = NULL;

    /* we update an object in the cache.
     *
     * Note that @entry_old MUST be what is currently tracked in multi_idx, and it must
     * have the same ID as @obj_new. */

    nm_assert(cache);
    nm_assert(entry_old || obj_new);
    nm_assert(!obj_new || nmp_object_is_alive(obj_new));
    nm_assert(
        !entry_old
        || entry_old
               == nm_dedup_multi_index_lookup_obj(cache->multi_idx, idx_type_o, entry_old->obj));
    nm_assert(!obj_new
              || entry_old
                     == nm_dedup_multi_index_lookup_obj(cache->multi_idx, idx_type_o, obj_new));
    nm_assert(!entry_old || entry_old->head->idx_type == idx_type_o);
    nm_assert(!entry_old || !obj_new
              || nm_dedup_multi_idx_type_partition_equal(idx_type_o, entry_old->obj, obj_new));
    nm_assert(!entry_old || !obj_new
              || nm_dedup_multi_idx_type_id_equal(idx_type_o, entry_old->obj, obj_new));
    nm_assert(!entry_old || !obj_new
              || (obj_new->parent.klass == ((const NMPObject *) entry_old->obj)->parent.klass
                  && !obj_new->parent.klass->obj_full_equal((NMDedupMultiObj *) obj_new,
                                                            entry_old->obj)));

    /* keep a reference to the pre-existing entry */
    if (entry_old)
        obj_old = nmp_object_ref(entry_old->obj);

    /* first update the main index NMP_CACHE_ID_TYPE_OBJECT_TYPE.
     * We already know the pre-existing @entry old, so all that
     * nm_dedup_multi_index_add_full() effectively does, is update the
     * obj reference.
     *
     * We also get the new boxed object, which we need below. */
    if (obj_new) {
        nm_auto_nmpobj NMPObject *obj_old2 = NULL;

        nm_dedup_multi_index_add_full(cache->multi_idx,
                                      idx_type_o,
                                      obj_new,
                                      is_dump ? NM_DEDUP_MULTI_IDX_MODE_APPEND_FORCE
                                              : _obj_get_add_mode(obj_new),
                                      NULL,
                                      entry_old ?: NM_DEDUP_MULTI_ENTRY_MISSING,
                                      NULL,
                                      &entry_new,
                                      (const NMDedupMultiObj **) &obj_old2);
        nm_assert(entry_new);
        nm_assert(obj_old == obj_old2);
        nm_assert(!entry_old || entry_old == entry_new);
    } else
        nm_dedup_multi_index_remove_entry(cache->multi_idx, entry_old);

    /* now update all other indexes. We know the previously boxed entry, and the
     * newly boxed one. */
    klass = NMP_OBJECT_GET_CLASS(entry_new ? entry_new->obj : obj_old);
    for (i_idx_type = klass->supported_cache_ids; *i_idx_type; i_idx_type++) {
        NMPCacheIdType id_type = *i_idx_type;

        if (id_type == NMP_CACHE_ID_TYPE_OBJECT_TYPE)
            continue;
        _idxcache_update_other_cache_ids(cache,
                                         id_type,
                                         obj_old,
                                         entry_new ? entry_new->obj : NULL,
                                         is_dump);
    }

    NM_SET_OUT(out_entry_new, entry_new);
}

NMPCacheOpsType
nmp_cache_remove(NMPCache         *cache,
                 const NMPObject  *obj_needle,
                 gboolean          equals_by_ptr,
                 gboolean          only_dirty,
                 const NMPObject **out_obj_old)
{
    const NMDedupMultiEntry *entry_old;
    const NMPObject         *obj_old;

    entry_old = _lookup_entry(cache, obj_needle);

    if (!entry_old) {
        NM_SET_OUT(out_obj_old, NULL);
        return NMP_CACHE_OPS_UNCHANGED;
    }

    obj_old = entry_old->obj;

    NM_SET_OUT(out_obj_old, nmp_object_ref(obj_old));

    if (equals_by_ptr && obj_old != obj_needle) {
        /* We found an identical object, but we only delete it if it's the same pointer as
         * @obj_needle. */
        return NMP_CACHE_OPS_UNCHANGED;
    }
    if (only_dirty && !entry_old->dirty) {
        /* the entry is not dirty. Skip. */
        return NMP_CACHE_OPS_UNCHANGED;
    }
    _idxcache_update(cache, entry_old, NULL, FALSE, NULL);
    return NMP_CACHE_OPS_REMOVED;
}

NMPCacheOpsType
nmp_cache_remove_netlink(NMPCache         *cache,
                         const NMPObject  *obj_needle,
                         const NMPObject **out_obj_old,
                         const NMPObject **out_obj_new)
{
    const NMDedupMultiEntry  *entry_old;
    const NMDedupMultiEntry  *entry_new = NULL;
    const NMPObject          *obj_old;
    nm_auto_nmpobj NMPObject *obj_new = NULL;

    entry_old = _lookup_entry(cache, obj_needle);

    if (!entry_old) {
        NM_SET_OUT(out_obj_old, NULL);
        NM_SET_OUT(out_obj_new, NULL);
        return NMP_CACHE_OPS_UNCHANGED;
    }

    obj_old = entry_old->obj;

    if (NMP_OBJECT_GET_TYPE(obj_needle) == NMP_OBJECT_TYPE_LINK) {
        /* For nmp_cache_remove_netlink() we have an incomplete @obj_needle instance to be
         * removed from netlink. Link objects are alive without being in netlink when they
         * have a udev-device. All we want to do in this case is clear the netlink.is_in_netlink
         * flag. */

        NM_SET_OUT(out_obj_old, nmp_object_ref(obj_old));

        if (!obj_old->_link.netlink.is_in_netlink) {
            nm_assert(obj_old->_link.udev.device);
            NM_SET_OUT(out_obj_new, nmp_object_ref(obj_old));
            return NMP_CACHE_OPS_UNCHANGED;
        }

        if (!obj_old->_link.udev.device) {
            /* the update would make @obj_old invalid. Remove it. */
            _idxcache_update(cache, entry_old, NULL, FALSE, NULL);
            NM_SET_OUT(out_obj_new, NULL);
            return NMP_CACHE_OPS_REMOVED;
        }

        obj_new                              = nmp_object_clone(obj_old, FALSE);
        obj_new->_link.netlink.is_in_netlink = FALSE;

        _nmp_object_fixup_link_master_connected(&obj_new, NULL, cache);
        _nmp_object_fixup_link_udev_fields(&obj_new, NULL, cache->use_udev);

        _idxcache_update(cache, entry_old, obj_new, FALSE, &entry_new);
        NM_SET_OUT(out_obj_new, nmp_object_ref(entry_new->obj));
        return NMP_CACHE_OPS_UPDATED;
    }

    NM_SET_OUT(out_obj_old, nmp_object_ref(obj_old));
    NM_SET_OUT(out_obj_new, NULL);
    _idxcache_update(cache, entry_old, NULL, FALSE, NULL);
    return NMP_CACHE_OPS_REMOVED;
}

/**
 * nmp_cache_update_netlink:
 * @cache: the platform cache
 * @obj_hand_over: a #NMPObject instance as received from netlink and created via
 *    nmp_object_from_nl(). Especially for link, it must not have the udev
 *    replated fields set.
 *    This instance will be modified and might be put into the cache. When
 *    calling nmp_cache_update_netlink() you hand @obj over to the cache.
 *    Except, that the cache will increment the ref count as appropriate. You
 *    must still unref the obj to release your part of the ownership.
 * @is_dump: whether this update comes during a dump of object of the same kind.
 *    kernel dumps objects in a certain order, which matters especially for routes.
 *    Before a dump we mark all objects as dirty, and remove all untouched objects
 *    afterwards. Hence, during a dump, every update should move the object to the
 *    end of the list, to obtain the correct order. That means, to use NM_DEDUP_MULTI_IDX_MODE_APPEND_FORCE,
 *    instead of NM_DEDUP_MULTI_IDX_MODE_APPEND.
 * @out_obj_old: (allow-none) (out): return the object with same ID as @obj_hand_over,
 *    that was in the cache before update. If an object is returned, the caller must
 *    unref it afterwards.
 * @out_obj_new: (allow-none) (out): return the object from the cache after update.
 *    The caller must unref this object.
 *
 * Returns: how the cache changed.
 *
 * Even if there was no change in the cache (NMP_CACHE_OPS_UNCHANGED), @out_obj_old
 * and @out_obj_new will be set accordingly.
 **/
NMPCacheOpsType
nmp_cache_update_netlink(NMPCache         *cache,
                         NMPObject        *obj_hand_over,
                         gboolean          is_dump,
                         const NMPObject **out_obj_old,
                         const NMPObject **out_obj_new)
{
    const NMDedupMultiEntry *entry_old;
    const NMDedupMultiEntry *entry_new;
    const NMPObject         *obj_old;
    gboolean                 is_alive;

    nm_assert(cache);
    nm_assert(NMP_OBJECT_IS_VALID(obj_hand_over));
    nm_assert(!NMP_OBJECT_IS_STACKINIT(obj_hand_over));
    /* A link object from netlink must have the udev related fields unset.
     * We could implement to handle that, but there is no need to support such
     * a use-case */
    nm_assert(NMP_OBJECT_GET_TYPE(obj_hand_over) != NMP_OBJECT_TYPE_LINK
              || (!obj_hand_over->_link.udev.device && !obj_hand_over->link.driver));
    nm_assert(nm_dedup_multi_index_obj_find(cache->multi_idx, obj_hand_over) != obj_hand_over);

    entry_old = _lookup_entry(cache, obj_hand_over);

    if (!entry_old) {
        NM_SET_OUT(out_obj_old, NULL);

        if (!nmp_object_is_alive(obj_hand_over)) {
            NM_SET_OUT(out_obj_new, NULL);
            return NMP_CACHE_OPS_UNCHANGED;
        }

        if (NMP_OBJECT_GET_TYPE(obj_hand_over) == NMP_OBJECT_TYPE_LINK) {
            _nmp_object_fixup_link_master_connected(&obj_hand_over, NULL, cache);
            _nmp_object_fixup_link_udev_fields(&obj_hand_over, NULL, cache->use_udev);
        }

        _idxcache_update(cache, entry_old, obj_hand_over, is_dump, &entry_new);
        NM_SET_OUT(out_obj_new, nmp_object_ref(entry_new->obj));
        return NMP_CACHE_OPS_ADDED;
    }

    obj_old = entry_old->obj;

    if (NMP_OBJECT_GET_TYPE(obj_hand_over) == NMP_OBJECT_TYPE_LINK) {
        if (!obj_hand_over->_link.netlink.is_in_netlink) {
            if (!obj_old->_link.netlink.is_in_netlink) {
                nm_assert(obj_old->_link.udev.device);
                NM_SET_OUT(out_obj_old, nmp_object_ref(obj_old));
                NM_SET_OUT(out_obj_new, nmp_object_ref(obj_old));
                return NMP_CACHE_OPS_UNCHANGED;
            }
            if (obj_old->_link.udev.device) {
                /* @obj_hand_over is not in netlink.
                 *
                 * This is similar to nmp_cache_remove_netlink(), but there we preserve the
                 * preexisting netlink properties. The use case of that is when kernel_get_object()
                 * cannot load an object (based on the id of a needle).
                 *
                 * Here we keep the data provided from @obj_hand_over. The usecase is when receiving
                 * a valid @obj_hand_over instance from netlink with RTM_DELROUTE.
                 */
                is_alive = TRUE;
            } else
                is_alive = FALSE;
        } else
            is_alive = TRUE;

        if (is_alive) {
            _nmp_object_fixup_link_master_connected(&obj_hand_over, NULL, cache);

            /* Merge the netlink parts with what we have from udev. */
            udev_device_unref(obj_hand_over->_link.udev.device);
            obj_hand_over->_link.udev.device =
                obj_old->_link.udev.device ? udev_device_ref(obj_old->_link.udev.device) : NULL;
            _nmp_object_fixup_link_udev_fields(&obj_hand_over, NULL, cache->use_udev);

            if (obj_hand_over->_link.netlink.lnk) {
                nm_auto_nmpobj const NMPObject *lnk_old = obj_hand_over->_link.netlink.lnk;

                /* let's dedup/intern the lnk object. */
                obj_hand_over->_link.netlink.lnk =
                    nm_dedup_multi_index_obj_intern(cache->multi_idx, lnk_old);
            }
        }
    } else
        is_alive = nmp_object_is_alive(obj_hand_over);

    NM_SET_OUT(out_obj_old, nmp_object_ref(obj_old));

    if (!is_alive) {
        /* the update would make @obj_old invalid. Remove it. */
        _idxcache_update(cache, entry_old, NULL, FALSE, NULL);
        NM_SET_OUT(out_obj_new, NULL);
        return NMP_CACHE_OPS_REMOVED;
    }

    if (nmp_object_equal(obj_old, obj_hand_over)) {
        if (is_dump)
            _idxcache_update_order_for_dump(cache, entry_old);
        nm_dedup_multi_entry_set_dirty(entry_old, FALSE);
        NM_SET_OUT(out_obj_new, nmp_object_ref(obj_old));
        return NMP_CACHE_OPS_UNCHANGED;
    }

    _idxcache_update(cache, entry_old, obj_hand_over, is_dump, &entry_new);
    NM_SET_OUT(out_obj_new, nmp_object_ref(entry_new->obj));
    return NMP_CACHE_OPS_UPDATED;
}

NMPCacheOpsType
nmp_cache_update_netlink_route(NMPCache         *cache,
                               NMPObject        *obj_hand_over,
                               gboolean          is_dump,
                               guint16           nlmsgflags,
                               gboolean          route_is_alive,
                               const NMPObject **out_obj_old,
                               const NMPObject **out_obj_new,
                               const NMPObject **out_obj_replace,
                               gboolean         *out_resync_required)
{
    NMDedupMultiIter             iter;
    const NMDedupMultiEntry     *entry_old;
    const NMDedupMultiEntry     *entry_new;
    const NMDedupMultiEntry     *entry_cur;
    const NMDedupMultiEntry     *entry_replace;
    const NMDedupMultiHeadEntry *head_entry;
    gboolean                     is_alive;
    NMPCacheOpsType              ops_type = NMP_CACHE_OPS_UNCHANGED;
    gboolean                     resync_required;

    nm_assert(cache);
    nm_assert(NMP_OBJECT_IS_VALID(obj_hand_over));
    nm_assert(!NMP_OBJECT_IS_STACKINIT(obj_hand_over));
    nm_assert(NM_IN_SET(NMP_OBJECT_GET_TYPE(obj_hand_over),
                        NMP_OBJECT_TYPE_IP4_ROUTE,
                        NMP_OBJECT_TYPE_IP6_ROUTE));
    nm_assert(nm_dedup_multi_index_obj_find(cache->multi_idx, obj_hand_over) != obj_hand_over);

    if (NM_FLAGS_HAS(nlmsgflags, NLM_F_REPLACE)) {
        /* This means, that the message indicates that another route was replaced.
         * Since we don't cache all routes (see "route_is_alive"), we cannot know
         * with certainty which route was replaced.
         *
         * Even if we would cache *all* routes (which we cannot, if kernel adds new
         * routing features that modify the known nmp_object_id_equal()), it would
         * be hard to find the right route that was replaced. Well, probably we
         * would have to keep NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID sorted by order
         * of notifications, which is hard. The code below actually makes an effort
         * to do that, but it's not actually used, because we just resync.
         *
         * The only proper solution for this would be to improve kernel with [1]
         * and [2].
         *
         * [1] https://bugzilla.redhat.com/show_bug.cgi?id=1337855
         * [2] https://bugzilla.redhat.com/show_bug.cgi?id=1337860
         *
         * We need to resync.
         */
        if (NMP_OBJECT_GET_TYPE(obj_hand_over) == NMP_OBJECT_TYPE_IP4_ROUTE
            && !nmp_cache_lookup_all(cache, NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID, obj_hand_over)) {
            /* For IPv4, we can do a small optimization. We skip the resync, if we have
             * no conflicting routes (by weak-id).
             *
             * This optimization does not work for IPv6 (maybe should be fixed).
             */
        } else {
            entry_replace   = NULL;
            resync_required = TRUE;
            goto out;
        }
    }

    entry_old = _lookup_entry(cache, obj_hand_over);
    entry_new = NULL;

    NM_SET_OUT(out_obj_old, nmp_object_ref(nm_dedup_multi_entry_get_obj(entry_old)));

    is_alive = route_is_alive && nmp_object_is_alive(obj_hand_over);

    if (!entry_old) {
        if (is_alive) {
            _idxcache_update(cache, NULL, obj_hand_over, is_dump, &entry_new);
            ops_type = NMP_CACHE_OPS_ADDED;
        }
        goto update_done;
    }

    if (!is_alive) {
        /* the update would make @entry_old invalid. Remove it. */
        _idxcache_update(cache, entry_old, NULL, FALSE, NULL);
        ops_type = NMP_CACHE_OPS_REMOVED;
        goto update_done;
    }

    if (nmp_object_equal(entry_old->obj, obj_hand_over)) {
        if (is_dump)
            _idxcache_update_order_for_dump(cache, entry_old);
        nm_dedup_multi_entry_set_dirty(entry_old, FALSE);
        goto update_done;
    }

    _idxcache_update(cache, entry_old, obj_hand_over, is_dump, &entry_new);
    ops_type = NMP_CACHE_OPS_UPDATED;

update_done:
    NM_SET_OUT(out_obj_new, nmp_object_ref(nm_dedup_multi_entry_get_obj(entry_new)));

    /* a RTM_GETROUTE event may signal that another object was replaced.
     * Find out whether that is the case and return it as @obj_replaced.
     *
     * Also, fixup the order of @entry_new within NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID
     * index. For most parts, we don't care about the order of objects (including routes).
     * But NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID we must keep in the correct order, to
     * properly find @obj_replaced. */
    resync_required = FALSE;
    entry_replace   = NULL;
    if (is_dump)
        goto out;

    if (!entry_new)
        goto out;

    /* For routes, we only maintain the order correctly for the BY_WEAK_ID
     * index. For all other indexes, their order is not preserved. */
    entry_cur =
        _lookup_entry_with_idx_type(cache, NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID, entry_new->obj);
    if (!entry_cur) {
        nm_assert_not_reached();
        goto out;
    }
    nm_assert(entry_cur->obj == entry_new->obj);

    head_entry = entry_cur->head;
    nm_assert(head_entry
              == nmp_cache_lookup_all(cache, NMP_CACHE_ID_TYPE_ROUTES_BY_WEAK_ID, entry_cur->obj));

    if (head_entry->len == 1) {
        /* there is only one object, and we expect it to be @obj_new. */
        nm_assert(nm_dedup_multi_head_entry_get_idx(head_entry, 0) == entry_cur);
        goto out;
    }

    switch (nlmsgflags & (NLM_F_REPLACE | NLM_F_EXCL | NLM_F_CREATE | NLM_F_APPEND)) {
    case NLM_F_REPLACE:
        /* ip route change */

        /* get the first element (but skip @obj_new). */
        nm_dedup_multi_iter_init(&iter, head_entry);
        if (!nm_dedup_multi_iter_next(&iter))
            nm_assert_not_reached();
        if (iter.current == entry_cur) {
            if (!nm_dedup_multi_iter_next(&iter))
                nm_assert_not_reached();
        }
        entry_replace = iter.current;

        nm_assert(entry_replace && entry_cur != entry_replace);

        nm_dedup_multi_entry_reorder(entry_cur, entry_replace, FALSE);
        break;
    case NLM_F_CREATE | NLM_F_APPEND:
        /* ip route append */
        nm_dedup_multi_entry_reorder(entry_cur, NULL, TRUE);
        break;
    case NLM_F_CREATE:
        /* ip route prepend */
        nm_dedup_multi_entry_reorder(entry_cur, NULL, FALSE);
        break;
    default:
        /* this is an unexpected case, probably a bug that we need to handle better. */
        resync_required = TRUE;
        break;
    }

out:
    NM_SET_OUT(out_obj_replace, nmp_object_ref(nm_dedup_multi_entry_get_obj(entry_replace)));
    NM_SET_OUT(out_resync_required, resync_required);
    return ops_type;
}

NMPCacheOpsType
nmp_cache_update_link_udev(NMPCache           *cache,
                           int                 ifindex,
                           struct udev_device *udevice,
                           const NMPObject   **out_obj_old,
                           const NMPObject   **out_obj_new)
{
    const NMPObject          *obj_old;
    nm_auto_nmpobj NMPObject *obj_new = NULL;
    const NMDedupMultiEntry  *entry_old;
    const NMDedupMultiEntry  *entry_new;

    entry_old = nmp_cache_lookup_entry_link(cache, ifindex);

    if (!entry_old) {
        if (!udevice) {
            NM_SET_OUT(out_obj_old, NULL);
            NM_SET_OUT(out_obj_new, NULL);
            return NMP_CACHE_OPS_UNCHANGED;
        }

        obj_new                    = nmp_object_new(NMP_OBJECT_TYPE_LINK, NULL);
        obj_new->link.ifindex      = ifindex;
        obj_new->_link.udev.device = udev_device_ref(udevice);

        _nmp_object_fixup_link_udev_fields(&obj_new, NULL, cache->use_udev);

        _idxcache_update(cache, NULL, obj_new, FALSE, &entry_new);
        NM_SET_OUT(out_obj_old, NULL);
        NM_SET_OUT(out_obj_new, nmp_object_ref(entry_new->obj));
        return NMP_CACHE_OPS_ADDED;
    } else {
        obj_old = entry_old->obj;
        NM_SET_OUT(out_obj_old, nmp_object_ref(obj_old));

        if (obj_old->_link.udev.device == udevice) {
            NM_SET_OUT(out_obj_new, nmp_object_ref(obj_old));
            return NMP_CACHE_OPS_UNCHANGED;
        }

        if (!udevice && !obj_old->_link.netlink.is_in_netlink) {
            /* the update would make @obj_old invalid. Remove it. */
            _idxcache_update(cache, entry_old, NULL, FALSE, NULL);
            NM_SET_OUT(out_obj_new, NULL);
            return NMP_CACHE_OPS_REMOVED;
        }

        obj_new = nmp_object_clone(obj_old, FALSE);

        udev_device_unref(obj_new->_link.udev.device);
        obj_new->_link.udev.device = udevice ? udev_device_ref(udevice) : NULL;

        _nmp_object_fixup_link_udev_fields(&obj_new, NULL, cache->use_udev);

        _idxcache_update(cache, entry_old, obj_new, FALSE, &entry_new);
        NM_SET_OUT(out_obj_new, nmp_object_ref(entry_new->obj));
        return NMP_CACHE_OPS_UPDATED;
    }
}

NMPCacheOpsType
nmp_cache_update_link_master_connected(NMPCache         *cache,
                                       int               ifindex,
                                       const NMPObject **out_obj_old,
                                       const NMPObject **out_obj_new)
{
    const NMDedupMultiEntry  *entry_old;
    const NMDedupMultiEntry  *entry_new = NULL;
    const NMPObject          *obj_old;
    nm_auto_nmpobj NMPObject *obj_new = NULL;

    entry_old = nmp_cache_lookup_entry_link(cache, ifindex);

    if (!entry_old) {
        NM_SET_OUT(out_obj_old, NULL);
        NM_SET_OUT(out_obj_new, NULL);
        return NMP_CACHE_OPS_UNCHANGED;
    }

    obj_old = entry_old->obj;

    if (!nmp_cache_link_connected_needs_toggle(cache, obj_old, NULL, NULL)) {
        NM_SET_OUT(out_obj_old, nmp_object_ref(obj_old));
        NM_SET_OUT(out_obj_new, nmp_object_ref(obj_old));
        return NMP_CACHE_OPS_UNCHANGED;
    }

    obj_new                 = nmp_object_clone(obj_old, FALSE);
    obj_new->link.connected = !obj_old->link.connected;

    NM_SET_OUT(out_obj_old, nmp_object_ref(obj_old));
    _idxcache_update(cache, entry_old, obj_new, FALSE, &entry_new);
    NM_SET_OUT(out_obj_new, nmp_object_ref(entry_new->obj));
    return NMP_CACHE_OPS_UPDATED;
}

/*****************************************************************************/

void
nmp_cache_dirty_set_all_main(NMPCache *cache, const NMPLookup *lookup)
{
    const NMDedupMultiHeadEntry *head_entry;
    NMDedupMultiIter             iter;

    nm_assert(cache);
    nm_assert(lookup);

    head_entry = nmp_cache_lookup(cache, lookup);

    nm_dedup_multi_iter_init(&iter, head_entry);
    while (nm_dedup_multi_iter_next(&iter)) {
        const NMDedupMultiEntry *main_entry;

        main_entry = nmp_cache_reresolve_main_entry(cache, iter.current, lookup);

        nm_dedup_multi_entry_set_dirty(main_entry, TRUE);
    }
}

/*****************************************************************************/

NMPCache *
nmp_cache_new(NMDedupMultiIndex *multi_idx, gboolean use_udev)
{
    NMPCache *cache = g_slice_new0(NMPCache);
    guint     i;

    for (i = NMP_CACHE_ID_TYPE_NONE + 1; i <= NMP_CACHE_ID_TYPE_MAX; i++)
        _dedup_multi_idx_type_init((DedupMultiIdxType *) _idx_type_get(cache, i), i);

    cache->multi_idx = nm_dedup_multi_index_ref(multi_idx);

    cache->use_udev = !!use_udev;
    return cache;
}

void
nmp_cache_free(NMPCache *cache)
{
    guint i;

    for (i = NMP_CACHE_ID_TYPE_NONE + 1; i <= NMP_CACHE_ID_TYPE_MAX; i++)
        nm_dedup_multi_index_remove_idx(cache->multi_idx, _idx_type_get(cache, i));

    nm_dedup_multi_index_unref(cache->multi_idx);

    g_slice_free(NMPCache, cache);
}

/*****************************************************************************/

void
nmtst_assert_nmp_cache_is_consistent(const NMPCache *cache)
{}

/*****************************************************************************/

/* below, ensure that addr_family get's automatically initialize to AF_UNSPEC. */
G_STATIC_ASSERT(AF_UNSPEC == 0);

typedef const char *(*CmdPlobjToStringFunc)(const NMPlatformObject *obj, char *buf, gsize len);
typedef const char *(*CmdPlobjToStringIdFunc)(const NMPlatformObject *obj, char *buf, gsize len);
typedef void (*CmdPlobjHashUpdateFunc)(const NMPlatformObject *obj, NMHashState *h);
typedef int (*CmdPlobjCmpFunc)(const NMPlatformObject *obj1, const NMPlatformObject *obj2);

const NMPClass _nmp_classes[NMP_OBJECT_TYPE_MAX] = {
    [NMP_OBJECT_TYPE_LINK - 1] =
        {
            .parent              = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type            = NMP_OBJECT_TYPE_LINK,
            .sizeof_data         = sizeof(NMPObjectLink),
            .sizeof_public       = sizeof(NMPlatformLink),
            .obj_type_name       = "link",
            .rtm_gettype         = RTM_GETLINK,
            .signal_type_id      = NM_PLATFORM_SIGNAL_ID_LINK,
            .signal_type         = NM_PLATFORM_SIGNAL_LINK_CHANGED,
            .supported_cache_ids = _supported_cache_ids_link,
            .cmd_obj_hash_update = _vt_cmd_obj_hash_update_link,
            .cmd_obj_cmp         = _vt_cmd_obj_cmp_link,
            .cmd_obj_copy        = _vt_cmd_obj_copy_link,
            .cmd_obj_dispose     = _vt_cmd_obj_dispose_link,
            .cmd_obj_is_alive    = _vt_cmd_obj_is_alive_link,
            .cmd_obj_is_visible  = _vt_cmd_obj_is_visible_link,
            .cmd_obj_to_string   = _vt_cmd_obj_to_string_link,
            .cmd_plobj_id_copy   = _vt_cmd_plobj_id_copy_link,
        },
    [NMP_OBJECT_TYPE_IP4_ADDRESS - 1] =
        {
            .parent                   = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type                 = NMP_OBJECT_TYPE_IP4_ADDRESS,
            .sizeof_data              = sizeof(NMPObjectIP4Address),
            .sizeof_public            = sizeof(NMPlatformIP4Address),
            .obj_type_name            = "ip4-address",
            .addr_family              = AF_INET,
            .rtm_gettype              = RTM_GETADDR,
            .signal_type_id           = NM_PLATFORM_SIGNAL_ID_IP4_ADDRESS,
            .signal_type              = NM_PLATFORM_SIGNAL_IP4_ADDRESS_CHANGED,
            .supported_cache_ids      = _supported_cache_ids_ipx_address,
            .cmd_obj_is_alive         = _vt_cmd_obj_is_alive_ipx_address,
            .cmd_plobj_id_copy        = _vt_cmd_plobj_id_copy_ip4_address,
            .cmd_plobj_id_cmp         = _vt_cmd_plobj_id_cmp_ip4_address,
            .cmd_plobj_id_hash_update = _vt_cmd_plobj_id_hash_update_ip4_address,
            .cmd_plobj_to_string_id   = _vt_cmd_plobj_to_string_id_ip4_address,
            .cmd_plobj_to_string      = (CmdPlobjToStringFunc) nm_platform_ip4_address_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_ip4_address_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_ip4_address_cmp_full,
        },
    [NMP_OBJECT_TYPE_IP6_ADDRESS - 1] =
        {
            .parent                   = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type                 = NMP_OBJECT_TYPE_IP6_ADDRESS,
            .sizeof_data              = sizeof(NMPObjectIP6Address),
            .sizeof_public            = sizeof(NMPlatformIP6Address),
            .obj_type_name            = "ip6-address",
            .addr_family              = AF_INET6,
            .rtm_gettype              = RTM_GETADDR,
            .signal_type_id           = NM_PLATFORM_SIGNAL_ID_IP6_ADDRESS,
            .signal_type              = NM_PLATFORM_SIGNAL_IP6_ADDRESS_CHANGED,
            .supported_cache_ids      = _supported_cache_ids_ipx_address,
            .cmd_obj_is_alive         = _vt_cmd_obj_is_alive_ipx_address,
            .cmd_plobj_id_copy        = _vt_cmd_plobj_id_copy_ip6_address,
            .cmd_plobj_id_cmp         = _vt_cmd_plobj_id_cmp_ip6_address,
            .cmd_plobj_id_hash_update = _vt_cmd_plobj_id_hash_update_ip6_address,
            .cmd_plobj_to_string_id   = _vt_cmd_plobj_to_string_id_ip6_address,
            .cmd_plobj_to_string      = (CmdPlobjToStringFunc) nm_platform_ip6_address_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_ip6_address_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_ip6_address_cmp_full,
        },
    [NMP_OBJECT_TYPE_IP4_ROUTE - 1] =
        {
            .parent              = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type            = NMP_OBJECT_TYPE_IP4_ROUTE,
            .sizeof_data         = sizeof(NMPObjectIP4Route),
            .sizeof_public       = sizeof(NMPlatformIP4Route),
            .obj_type_name       = "ip4-route",
            .addr_family         = AF_INET,
            .rtm_gettype         = RTM_GETROUTE,
            .signal_type_id      = NM_PLATFORM_SIGNAL_ID_IP4_ROUTE,
            .signal_type         = NM_PLATFORM_SIGNAL_IP4_ROUTE_CHANGED,
            .supported_cache_ids = _supported_cache_ids_ipx_route,
            .cmd_obj_is_alive    = _vt_cmd_obj_is_alive_ipx_route,
            .cmd_obj_hash_update = _vt_cmd_obj_hash_update_ip4_route,
            .cmd_obj_cmp         = _vt_cmd_obj_cmp_ip4_route,
            .cmd_obj_copy        = _vt_cmd_obj_copy_ip4_route,
            .cmd_obj_dispose     = _vt_cmd_obj_dispose_ip4_route,
            .cmd_obj_to_string   = _vt_cmd_obj_to_string_ip4_route,
        },
    [NMP_OBJECT_TYPE_IP6_ROUTE - 1] =
        {
            .parent                   = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type                 = NMP_OBJECT_TYPE_IP6_ROUTE,
            .sizeof_data              = sizeof(NMPObjectIP6Route),
            .sizeof_public            = sizeof(NMPlatformIP6Route),
            .obj_type_name            = "ip6-route",
            .addr_family              = AF_INET6,
            .rtm_gettype              = RTM_GETROUTE,
            .signal_type_id           = NM_PLATFORM_SIGNAL_ID_IP6_ROUTE,
            .signal_type              = NM_PLATFORM_SIGNAL_IP6_ROUTE_CHANGED,
            .supported_cache_ids      = _supported_cache_ids_ipx_route,
            .cmd_obj_is_alive         = _vt_cmd_obj_is_alive_ipx_route,
            .cmd_plobj_id_cmp         = _vt_cmd_plobj_id_cmp_ip6_route,
            .cmd_plobj_id_hash_update = _vt_cmd_plobj_id_hash_update_ip6_route,
            .cmd_plobj_to_string_id   = (CmdPlobjToStringIdFunc) nm_platform_ip6_route_to_string,
            .cmd_plobj_to_string      = (CmdPlobjToStringFunc) nm_platform_ip6_route_to_string,
            .cmd_plobj_hash_update    = _vt_cmd_plobj_hash_update_ip6_route,
            .cmd_plobj_cmp            = _vt_cmd_plobj_cmp_ip6_route,
        },
    [NMP_OBJECT_TYPE_ROUTING_RULE - 1] =
        {
            .parent                   = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type                 = NMP_OBJECT_TYPE_ROUTING_RULE,
            .sizeof_data              = sizeof(NMPObjectRoutingRule),
            .sizeof_public            = sizeof(NMPlatformRoutingRule),
            .obj_type_name            = "routing-rule",
            .rtm_gettype              = RTM_GETRULE,
            .signal_type_id           = NM_PLATFORM_SIGNAL_ID_ROUTING_RULE,
            .signal_type              = NM_PLATFORM_SIGNAL_ROUTING_RULE_CHANGED,
            .supported_cache_ids      = _supported_cache_ids_routing_rules,
            .cmd_obj_is_alive         = _vt_cmd_obj_is_alive_routing_rule,
            .cmd_plobj_id_cmp         = _vt_cmd_plobj_id_cmp_routing_rule,
            .cmd_plobj_id_hash_update = _vt_cmd_plobj_id_hash_update_routing_rule,
            .cmd_plobj_to_string_id   = (CmdPlobjToStringIdFunc) nm_platform_routing_rule_to_string,
            .cmd_plobj_to_string      = (CmdPlobjToStringFunc) nm_platform_routing_rule_to_string,
            .cmd_plobj_hash_update    = _vt_cmd_plobj_hash_update_routing_rule,
            .cmd_plobj_cmp            = _vt_cmd_plobj_cmp_routing_rule,
        },
    [NMP_OBJECT_TYPE_QDISC - 1] =
        {
            .parent                   = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type                 = NMP_OBJECT_TYPE_QDISC,
            .sizeof_data              = sizeof(NMPObjectQdisc),
            .sizeof_public            = sizeof(NMPlatformQdisc),
            .obj_type_name            = "qdisc",
            .rtm_gettype              = RTM_GETQDISC,
            .signal_type_id           = NM_PLATFORM_SIGNAL_ID_QDISC,
            .signal_type              = NM_PLATFORM_SIGNAL_QDISC_CHANGED,
            .supported_cache_ids      = _supported_cache_ids_object,
            .cmd_obj_is_alive         = _vt_cmd_obj_is_alive_qdisc,
            .cmd_plobj_id_cmp         = _vt_cmd_plobj_id_cmp_qdisc,
            .cmd_plobj_id_hash_update = _vt_cmd_plobj_id_hash_update_qdisc,
            .cmd_plobj_to_string_id   = _vt_cmd_plobj_to_string_id_qdisc,
            .cmd_plobj_to_string      = (CmdPlobjToStringFunc) nm_platform_qdisc_to_string,
            .cmd_plobj_hash_update    = (CmdPlobjHashUpdateFunc) nm_platform_qdisc_hash_update,
            .cmd_plobj_cmp            = _vt_cmd_plobj_cmp_qdisc,
        },
    [NMP_OBJECT_TYPE_TFILTER - 1] =
        {
            .parent                   = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type                 = NMP_OBJECT_TYPE_TFILTER,
            .sizeof_data              = sizeof(NMPObjectTfilter),
            .sizeof_public            = sizeof(NMPlatformTfilter),
            .obj_type_name            = "tfilter",
            .rtm_gettype              = RTM_GETTFILTER,
            .signal_type_id           = NM_PLATFORM_SIGNAL_ID_TFILTER,
            .signal_type              = NM_PLATFORM_SIGNAL_TFILTER_CHANGED,
            .supported_cache_ids      = _supported_cache_ids_object,
            .cmd_obj_is_alive         = _vt_cmd_obj_is_alive_tfilter,
            .cmd_plobj_id_cmp         = _vt_cmd_plobj_id_cmp_tfilter,
            .cmd_plobj_id_hash_update = _vt_cmd_plobj_id_hash_update_tfilter,
            .cmd_plobj_to_string_id   = _vt_cmd_plobj_to_string_id_tfilter,
            .cmd_plobj_to_string      = (CmdPlobjToStringFunc) nm_platform_tfilter_to_string,
            .cmd_plobj_hash_update    = (CmdPlobjHashUpdateFunc) nm_platform_tfilter_hash_update,
            .cmd_plobj_cmp            = (CmdPlobjCmpFunc) nm_platform_tfilter_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_BRIDGE - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_BRIDGE,
            .sizeof_data           = sizeof(NMPObjectLnkBridge),
            .sizeof_public         = sizeof(NMPlatformLnkBridge),
            .obj_type_name         = "bridge",
            .lnk_link_type         = NM_LINK_TYPE_BRIDGE,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_bridge_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_bridge_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_bridge_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_GRE - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_GRE,
            .sizeof_data           = sizeof(NMPObjectLnkGre),
            .sizeof_public         = sizeof(NMPlatformLnkGre),
            .obj_type_name         = "gre",
            .lnk_link_type         = NM_LINK_TYPE_GRE,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_gre_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_gre_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_gre_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_GRETAP - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_GRETAP,
            .sizeof_data           = sizeof(NMPObjectLnkGre),
            .sizeof_public         = sizeof(NMPlatformLnkGre),
            .obj_type_name         = "gretap",
            .lnk_link_type         = NM_LINK_TYPE_GRETAP,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_gre_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_gre_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_gre_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_INFINIBAND - 1] =
        {
            .parent              = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type            = NMP_OBJECT_TYPE_LNK_INFINIBAND,
            .sizeof_data         = sizeof(NMPObjectLnkInfiniband),
            .sizeof_public       = sizeof(NMPlatformLnkInfiniband),
            .obj_type_name       = "infiniband",
            .lnk_link_type       = NM_LINK_TYPE_INFINIBAND,
            .cmd_plobj_to_string = (CmdPlobjToStringFunc) nm_platform_lnk_infiniband_to_string,
            .cmd_plobj_hash_update =
                (CmdPlobjHashUpdateFunc) nm_platform_lnk_infiniband_hash_update,
            .cmd_plobj_cmp = (CmdPlobjCmpFunc) nm_platform_lnk_infiniband_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_IP6TNL - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_IP6TNL,
            .sizeof_data           = sizeof(NMPObjectLnkIp6Tnl),
            .sizeof_public         = sizeof(NMPlatformLnkIp6Tnl),
            .obj_type_name         = "ip6tnl",
            .lnk_link_type         = NM_LINK_TYPE_IP6TNL,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_ip6tnl_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_ip6tnl_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_ip6tnl_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_IP6GRE - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_IP6GRE,
            .sizeof_data           = sizeof(NMPObjectLnkIp6Tnl),
            .sizeof_public         = sizeof(NMPlatformLnkIp6Tnl),
            .obj_type_name         = "ip6gre",
            .lnk_link_type         = NM_LINK_TYPE_IP6GRE,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_ip6tnl_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_ip6tnl_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_ip6tnl_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_IP6GRETAP - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_IP6GRETAP,
            .sizeof_data           = sizeof(NMPObjectLnkIp6Tnl),
            .sizeof_public         = sizeof(NMPlatformLnkIp6Tnl),
            .obj_type_name         = "ip6gretap",
            .lnk_link_type         = NM_LINK_TYPE_IP6GRETAP,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_ip6tnl_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_ip6tnl_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_ip6tnl_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_IPIP - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_IPIP,
            .sizeof_data           = sizeof(NMPObjectLnkIpIp),
            .sizeof_public         = sizeof(NMPlatformLnkIpIp),
            .obj_type_name         = "ipip",
            .lnk_link_type         = NM_LINK_TYPE_IPIP,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_ipip_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_ipip_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_ipip_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_MACSEC - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_MACSEC,
            .sizeof_data           = sizeof(NMPObjectLnkMacsec),
            .sizeof_public         = sizeof(NMPlatformLnkMacsec),
            .obj_type_name         = "macsec",
            .lnk_link_type         = NM_LINK_TYPE_MACSEC,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_macsec_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_macsec_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_macsec_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_MACVLAN - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_MACVLAN,
            .sizeof_data           = sizeof(NMPObjectLnkMacvlan),
            .sizeof_public         = sizeof(NMPlatformLnkMacvlan),
            .obj_type_name         = "macvlan",
            .lnk_link_type         = NM_LINK_TYPE_MACVLAN,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_macvlan_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_macvlan_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_macvlan_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_MACVTAP - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_MACVTAP,
            .sizeof_data           = sizeof(NMPObjectLnkMacvtap),
            .sizeof_public         = sizeof(NMPlatformLnkMacvlan),
            .obj_type_name         = "macvtap",
            .lnk_link_type         = NM_LINK_TYPE_MACVTAP,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_macvlan_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_macvlan_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_macvlan_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_SIT - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_SIT,
            .sizeof_data           = sizeof(NMPObjectLnkSit),
            .sizeof_public         = sizeof(NMPlatformLnkSit),
            .obj_type_name         = "sit",
            .lnk_link_type         = NM_LINK_TYPE_SIT,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_sit_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_sit_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_sit_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_TUN - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_TUN,
            .sizeof_data           = sizeof(NMPObjectLnkTun),
            .sizeof_public         = sizeof(NMPlatformLnkTun),
            .obj_type_name         = "tun",
            .lnk_link_type         = NM_LINK_TYPE_TUN,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_tun_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_tun_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_tun_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_VLAN - 1] =
        {
            .parent              = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type            = NMP_OBJECT_TYPE_LNK_VLAN,
            .sizeof_data         = sizeof(NMPObjectLnkVlan),
            .sizeof_public       = sizeof(NMPlatformLnkVlan),
            .obj_type_name       = "vlan",
            .lnk_link_type       = NM_LINK_TYPE_VLAN,
            .cmd_obj_hash_update = _vt_cmd_obj_hash_update_lnk_vlan,
            .cmd_obj_cmp         = _vt_cmd_obj_cmp_lnk_vlan,
            .cmd_obj_copy        = _vt_cmd_obj_copy_lnk_vlan,
            .cmd_obj_dispose     = _vt_cmd_obj_dispose_lnk_vlan,
            .cmd_obj_to_string   = _vt_cmd_obj_to_string_lnk_vlan,
        },
    [NMP_OBJECT_TYPE_LNK_VRF - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_VRF,
            .sizeof_data           = sizeof(NMPObjectLnkVrf),
            .sizeof_public         = sizeof(NMPlatformLnkVrf),
            .obj_type_name         = "vrf",
            .lnk_link_type         = NM_LINK_TYPE_VRF,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_vrf_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_vrf_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_vrf_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_VTI - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_VTI,
            .sizeof_data           = sizeof(NMPObjectLnkVti),
            .sizeof_public         = sizeof(NMPlatformLnkVti),
            .obj_type_name         = "vti",
            .lnk_link_type         = NM_LINK_TYPE_VTI,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_vti_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_vti_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_vti_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_VTI6 - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_VTI6,
            .sizeof_data           = sizeof(NMPObjectLnkVti6),
            .sizeof_public         = sizeof(NMPlatformLnkVti6),
            .obj_type_name         = "vti6",
            .lnk_link_type         = NM_LINK_TYPE_VTI6,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_vti6_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_vti6_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_vti6_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_VXLAN - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_VXLAN,
            .sizeof_data           = sizeof(NMPObjectLnkVxlan),
            .sizeof_public         = sizeof(NMPlatformLnkVxlan),
            .obj_type_name         = "vxlan",
            .lnk_link_type         = NM_LINK_TYPE_VXLAN,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_vxlan_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_vxlan_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_vxlan_cmp,
        },
    [NMP_OBJECT_TYPE_LNK_WIREGUARD - 1] =
        {
            .parent              = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type            = NMP_OBJECT_TYPE_LNK_WIREGUARD,
            .sizeof_data         = sizeof(NMPObjectLnkWireGuard),
            .sizeof_public       = sizeof(NMPlatformLnkWireGuard),
            .obj_type_name       = "wireguard",
            .lnk_link_type       = NM_LINK_TYPE_WIREGUARD,
            .cmd_obj_hash_update = _vt_cmd_obj_hash_update_lnk_wireguard,
            .cmd_obj_cmp         = _vt_cmd_obj_cmp_lnk_wireguard,
            .cmd_obj_copy        = _vt_cmd_obj_copy_lnk_wireguard,
            .cmd_obj_dispose     = _vt_cmd_obj_dispose_lnk_wireguard,
            .cmd_obj_to_string   = _vt_cmd_obj_to_string_lnk_wireguard,
        },
    [NMP_OBJECT_TYPE_LNK_BOND - 1] =
        {
            .parent                = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type              = NMP_OBJECT_TYPE_LNK_BOND,
            .sizeof_data           = sizeof(NMPObjectLnkBond),
            .sizeof_public         = sizeof(NMPlatformLnkBond),
            .obj_type_name         = "bond",
            .lnk_link_type         = NM_LINK_TYPE_BOND,
            .cmd_plobj_to_string   = (CmdPlobjToStringFunc) nm_platform_lnk_bond_to_string,
            .cmd_plobj_hash_update = (CmdPlobjHashUpdateFunc) nm_platform_lnk_bond_hash_update,
            .cmd_plobj_cmp         = (CmdPlobjCmpFunc) nm_platform_lnk_bond_cmp,
        },
    [NMP_OBJECT_TYPE_MPTCP_ADDR - 1] =
        {
            .parent                   = DEDUP_MULTI_OBJ_CLASS_INIT(),
            .obj_type                 = NMP_OBJECT_TYPE_MPTCP_ADDR,
            .sizeof_data              = sizeof(NMPObjectMptcpAddr),
            .sizeof_public            = sizeof(NMPlatformMptcpAddr),
            .obj_type_name            = "mptcp-addr",
            .supported_cache_ids      = _supported_cache_ids_object,
            .cmd_obj_is_alive         = _vt_cmd_obj_is_alive_mptcp_addr,
            .cmd_plobj_id_cmp         = _vt_cmd_plobj_id_cmp_mptcp_addr,
            .cmd_plobj_id_hash_update = _vt_cmd_plobj_id_hash_update_mptcp_addr,
            .cmd_plobj_to_string_id   = (CmdPlobjToStringIdFunc) nm_platform_mptcp_addr_to_string,
            .cmd_plobj_to_string      = (CmdPlobjToStringFunc) nm_platform_mptcp_addr_to_string,
            .cmd_plobj_hash_update    = (CmdPlobjHashUpdateFunc) nm_platform_mptcp_addr_hash_update,
            .cmd_plobj_cmp            = (CmdPlobjCmpFunc) nm_platform_mptcp_addr_cmp,
        },
};
