Merge branch 'merges' of git://repo.or.cz/unleashed into merges

[unleashed.git] / usr / src / lib / libipadm / common / ipadm_addr.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2013 by Delphix. All rights reserved.
 * Copyright (c) 2016-2017, Chris Fraire <cfraire@me.com>.
 */

/*
 * This file contains functions for address management such as creating
 * an address, deleting an address, enabling an address, disabling an
 * address, bringing an address down or up, setting/getting properties
 * on an address object and listing address information
 * for all addresses in active as well as persistent configuration.
 */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netdb.h>
#include <inet/ip.h>
#include <string.h>
#include <strings.h>
#include <assert.h>
#include <sys/sockio.h>
#include <errno.h>
#include <unistd.h>
#include <stropts.h>
#include <zone.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <ctype.h>
#include <dhcpagent_util.h>
#include <dhcpagent_ipc.h>
#include <dhcp_inittab.h>
#include <dhcp_symbol.h>
#include <ipadm_ndpd.h>
#include <libdladm.h>
#include <libdllink.h>
#include <libdliptun.h>
#include <ifaddrs.h>
#include "libipadm_impl.h"

#define SIN6(a)         ((struct sockaddr_in6 *)a)
#define SIN(a)          ((struct sockaddr_in *)a)

static ipadm_status_t   i_ipadm_create_addr(ipadm_handle_t, ipadm_addrobj_t,
                            uint32_t);
static ipadm_status_t   i_ipadm_create_dhcp(ipadm_handle_t, ipadm_addrobj_t,
                            uint32_t);
static ipadm_status_t   i_ipadm_delete_dhcp(ipadm_handle_t, ipadm_addrobj_t,
                            boolean_t);
static ipadm_status_t   i_ipadm_refresh_dhcp(ipadm_addrobj_t);
static ipadm_status_t   i_ipadm_get_db_addr(ipadm_handle_t, const char *,
                            const char *, nvlist_t **);
static ipadm_status_t   i_ipadm_op_dhcp(ipadm_addrobj_t, dhcp_ipc_type_t,
                            int *);
static ipadm_status_t   i_ipadm_dhcp_status(ipadm_addrobj_t addr,
                            dhcp_status_t *status, int *dhcperror);
static ipadm_status_t   i_ipadm_validate_create_addr(ipadm_handle_t,
                            ipadm_addrobj_t, uint32_t);
static ipadm_status_t   i_ipadm_addr_persist_nvl(ipadm_handle_t, nvlist_t *,
                            uint32_t);
static ipadm_status_t   i_ipadm_get_default_prefixlen(struct sockaddr_storage *,
                            uint32_t *);
static ipadm_status_t   i_ipadm_get_static_addr_db(ipadm_handle_t,
                            ipadm_addrobj_t);
static boolean_t        i_ipadm_is_user_aobjname_valid(const char *);
static ipadm_prop_desc_t        *i_ipadm_get_addrprop_desc(const char *pname);

/*
 * Callback functions to retrieve property values from the kernel. These
 * functions, when required, translate the values from the kernel to a format
 * suitable for printing. They also retrieve DEFAULT, PERM and POSSIBLE values
 * for a given property.
 */
static ipadm_pd_getf_t  i_ipadm_get_prefixlen, i_ipadm_get_addr_flag,
                        i_ipadm_get_zone, i_ipadm_get_broadcast,
                        i_ipadm_get_primary, i_ipadm_get_reqhost;

/*
 * Callback functions to set property values. These functions translate the
 * values to a format suitable for kernel consumption, allocate the necessary
 * ioctl buffers and then invoke ioctl(); or in the case of reqhost, get the
 * collaborating agent to set the value.
 */
static ipadm_pd_setf_t  i_ipadm_set_prefixlen, i_ipadm_set_addr_flag,
                        i_ipadm_set_zone, i_ipadm_set_reqhost;

static ipadm_status_t   i_ipadm_set_aobj_addrprop(ipadm_handle_t iph,
    ipadm_addrobj_t ipaddr, uint_t flags, const char *propname);

/* address properties description table */
ipadm_prop_desc_t ipadm_addrprop_table[] = {
        { "broadcast", NULL, IPADMPROP_CLASS_ADDR, MOD_PROTO_NONE, 0,
            NULL, NULL, i_ipadm_get_broadcast },

        { "deprecated", NULL, IPADMPROP_CLASS_ADDR, MOD_PROTO_NONE, 0,
            i_ipadm_set_addr_flag, i_ipadm_get_onoff,
            i_ipadm_get_addr_flag },

        { IPADM_NVP_PREFIXLEN, NULL, IPADMPROP_CLASS_ADDR, MOD_PROTO_NONE, 0,
            i_ipadm_set_prefixlen, i_ipadm_get_prefixlen,
            i_ipadm_get_prefixlen },

        /*
         * primary is read-only because there is no operation to un-set
         * DHCP_IF_PRIMARY in dhcpagent except to delete-addr and then
         * re-create-addr.
         */
        { "primary", NULL, IPADMPROP_CLASS_ADDR, MOD_PROTO_NONE, 0,
                NULL, NULL, i_ipadm_get_primary },

        { "private", NULL, IPADMPROP_CLASS_ADDR, MOD_PROTO_NONE, 0,
            i_ipadm_set_addr_flag, i_ipadm_get_onoff, i_ipadm_get_addr_flag },

        { IPADM_NVP_REQHOST, NULL, IPADMPROP_CLASS_ADDR, MOD_PROTO_NONE, 0,
            i_ipadm_set_reqhost, NULL, i_ipadm_get_reqhost },

        { "transmit", NULL, IPADMPROP_CLASS_ADDR, MOD_PROTO_NONE, 0,
            i_ipadm_set_addr_flag, i_ipadm_get_onoff, i_ipadm_get_addr_flag },

        { "zone", NULL, IPADMPROP_CLASS_ADDR, MOD_PROTO_NONE, 0,
            i_ipadm_set_zone, NULL, i_ipadm_get_zone },

        { NULL, NULL, 0, 0, 0, NULL, NULL, NULL }
};

static ipadm_prop_desc_t up_addrprop = { "up", NULL, IPADMPROP_CLASS_ADDR,
                                        MOD_PROTO_NONE, 0, NULL, NULL, NULL };

/*
 * Helper function that initializes the `ipadm_ifname', `ipadm_aobjname', and
 * `ipadm_atype' fields of the given `ipaddr'.
 */
void
i_ipadm_init_addr(ipadm_addrobj_t ipaddr, const char *ifname,
    const char *aobjname, ipadm_addr_type_t atype)
{
        bzero(ipaddr, sizeof (struct ipadm_addrobj_s));
        (void) strlcpy(ipaddr->ipadm_ifname, ifname,
            sizeof (ipaddr->ipadm_ifname));
        (void) strlcpy(ipaddr->ipadm_aobjname, aobjname,
            sizeof (ipaddr->ipadm_aobjname));
        ipaddr->ipadm_atype = atype;
}

/*
 * Determine the permission of the property depending on whether it has a
 * set() and/or get() callback functions.
 */
static ipadm_status_t
i_ipadm_pd2permstr(ipadm_prop_desc_t *pdp, char *buf, uint_t *bufsize)
{
        uint_t  perm;
        size_t  nbytes;

        perm = 0;
        if (pdp->ipd_set != NULL)
                perm |= MOD_PROP_PERM_WRITE;
        if (pdp->ipd_get != NULL)
                perm |= MOD_PROP_PERM_READ;

        nbytes = snprintf(buf, *bufsize, "%c%c",
            ((perm & MOD_PROP_PERM_READ) != 0) ? 'r' : '-',
            ((perm & MOD_PROP_PERM_WRITE) != 0) ? 'w' : '-');

        if (nbytes >= *bufsize) {
                /* insufficient buffer space */
                *bufsize = nbytes + 1;
                return (IPADM_NO_BUFS);
        }
        return (IPADM_SUCCESS);
}

/*
 * Given an addrobj with `ipadm_aobjname' filled in, i_ipadm_get_addrobj()
 * retrieves the information necessary for any operation on the object,
 * such as delete-addr, enable-addr, disable-addr, up-addr, down-addr,
 * refresh-addr, get-addrprop or set-addrprop. The information include
 * the logical interface number, address type, address family,
 * the interface id (if the address type is IPADM_ADDR_IPV6_ADDRCONF) and
 * the ipadm_flags that indicate if the address is present in
 * active configuration or persistent configuration or both. If the address
 * is not found, IPADM_NOTSUP is returned.
 */
ipadm_status_t
i_ipadm_get_addrobj(ipadm_handle_t iph, ipadm_addrobj_t ipaddr)
{
        ipmgmt_aobjop_arg_t     larg;
        ipmgmt_aobjop_rval_t    rval, *rvalp;
        int                     err = 0;

        /* populate the door_call argument structure */
        larg.ia_cmd = IPMGMT_CMD_AOBJNAME2ADDROBJ;
        (void) strlcpy(larg.ia_aobjname, ipaddr->ipadm_aobjname,
            sizeof (larg.ia_aobjname));

        rvalp = &rval;
        err = ipadm_door_call(iph, &larg, sizeof (larg), (void **)&rvalp,
            sizeof (rval), B_FALSE);
        if (err != 0)
                return (ipadm_errno2status(err));
        (void) strlcpy(ipaddr->ipadm_ifname, rval.ir_ifname,
            sizeof (ipaddr->ipadm_ifname));
        ipaddr->ipadm_lifnum = rval.ir_lnum;
        ipaddr->ipadm_atype = rval.ir_atype;
        ipaddr->ipadm_af = rval.ir_family;
        ipaddr->ipadm_flags = rval.ir_flags;
        switch (rval.ir_atype) {
        case IPADM_ADDR_IPV6_ADDRCONF:
                ipaddr->ipadm_intfid = rval.ipmgmt_ir_intfid;
                break;
        case IPADM_ADDR_DHCP:
                if (strlcpy(ipaddr->ipadm_reqhost, rval.ipmgmt_ir_reqhost,
                    sizeof (ipaddr->ipadm_reqhost)) >=
                    sizeof (ipaddr->ipadm_reqhost)) {
                        /*
                         * shouldn't get here as the buffers are defined
                         * with same length, MAX_NAME_LEN
                         */
                        return (IPADM_FAILURE);
                }
                break;
        default:
                break;
        }

        return (IPADM_SUCCESS);
}

/*
 * Retrieves the static address (IPv4 or IPv6) for the given address object
 * in `ipaddr' from persistent DB.
 */
static ipadm_status_t
i_ipadm_get_static_addr_db(ipadm_handle_t iph, ipadm_addrobj_t ipaddr)
{
        ipadm_status_t          status;
        nvlist_t                *onvl;
        nvlist_t                *anvl = NULL;
        nvlist_t                *nvladdr;
        nvpair_t                *nvp;
        char                    *name;
        char                    *aobjname = ipaddr->ipadm_aobjname;
        char                    *sname;
        sa_family_t             af = AF_UNSPEC;

        /*
         * Get the address line in the nvlist `onvl' from ipmgmtd daemon.
         */
        status = i_ipadm_get_db_addr(iph, NULL, aobjname, &onvl);
        if (status != IPADM_SUCCESS)
                return (status);
        /*
         * Walk through the nvlist `onvl' to extract the IPADM_NVP_IPV4ADDR
         * or the IPADM_NVP_IPV6ADDR name-value pair.
         */
        for (nvp = nvlist_next_nvpair(onvl, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(onvl, NULL)) {
                if (nvpair_value_nvlist(nvp, &anvl) != 0)
                        continue;
                if (nvlist_exists(anvl, IPADM_NVP_IPV4ADDR) ||
                    nvlist_exists(anvl, IPADM_NVP_IPV6ADDR))
                        break;
        }
        if (nvp == NULL)
                goto fail;
        for (nvp = nvlist_next_nvpair(anvl, NULL);
            nvp != NULL; nvp = nvlist_next_nvpair(anvl, nvp)) {
                name = nvpair_name(nvp);
                if (strcmp(name, IPADM_NVP_IPV4ADDR) == 0) {
                        af = AF_INET;
                        break;
                } else if (strcmp(name, IPADM_NVP_IPV6ADDR) == 0) {
                        af = AF_INET6;
                        break;
                }
        }
        assert(af != AF_UNSPEC);
        if (nvpair_value_nvlist(nvp, &nvladdr) != 0 ||
            nvlist_lookup_string(nvladdr, IPADM_NVP_IPADDRHNAME, &sname) != 0 ||
            ipadm_set_addr(ipaddr, sname, af) != IPADM_SUCCESS) {
                goto fail;
        }
        nvlist_free(onvl);
        return (IPADM_SUCCESS);
fail:
        nvlist_free(onvl);
        return (IPADM_NOTFOUND);
}

/*
 * For the given `addrobj->ipadm_lifnum' and `addrobj->ipadm_af', this function
 * fills in the address objname, the address type and the ipadm_flags.
 */
ipadm_status_t
i_ipadm_get_lif2addrobj(ipadm_handle_t iph, ipadm_addrobj_t addrobj)
{
        ipmgmt_aobjop_arg_t     larg;
        ipmgmt_aobjop_rval_t    rval, *rvalp;
        int                     err;

        larg.ia_cmd = IPMGMT_CMD_LIF2ADDROBJ;
        (void) strlcpy(larg.ia_ifname, addrobj->ipadm_ifname,
            sizeof (larg.ia_ifname));
        larg.ia_lnum = addrobj->ipadm_lifnum;
        larg.ia_family = addrobj->ipadm_af;

        rvalp = &rval;
        err = ipadm_door_call(iph, &larg, sizeof (larg), (void **)&rvalp,
            sizeof (rval), B_FALSE);
        if (err != 0)
                return (ipadm_errno2status(err));
        (void) strlcpy(addrobj->ipadm_aobjname, rval.ir_aobjname,
            sizeof (addrobj->ipadm_aobjname));
        addrobj->ipadm_atype = rval.ir_atype;
        addrobj->ipadm_flags = rval.ir_flags;

        return (IPADM_SUCCESS);
}

/*
 * Adds an addrobj to ipmgmtd daemon's aobjmap (active configuration).
 * with the given name and logical interface number.
 * This API is called by in.ndpd to add addrobjs when new prefixes or
 * dhcpv6 addresses are configured.
 */
ipadm_status_t
ipadm_add_aobjname(ipadm_handle_t iph, const char *ifname, sa_family_t af,
    const char *aobjname, ipadm_addr_type_t atype, int lnum)
{
        ipmgmt_aobjop_arg_t     larg;
        int                     err;

        larg.ia_cmd = IPMGMT_CMD_ADDROBJ_ADD;
        (void) strlcpy(larg.ia_ifname, ifname, sizeof (larg.ia_ifname));
        (void) strlcpy(larg.ia_aobjname, aobjname, sizeof (larg.ia_aobjname));
        larg.ia_atype = atype;
        larg.ia_lnum = lnum;
        larg.ia_family = af;
        err = ipadm_door_call(iph, &larg, sizeof (larg), NULL, 0, B_FALSE);
        return (ipadm_errno2status(err));
}

/*
 * Deletes an address object with given name and logical number from ipmgmtd
 * daemon's aobjmap (active configuration). This API is called by in.ndpd to
 * remove addrobjs when auto-configured prefixes or dhcpv6 addresses are
 * removed.
 */
ipadm_status_t
ipadm_delete_aobjname(ipadm_handle_t iph, const char *ifname, sa_family_t af,
    const char *aobjname, ipadm_addr_type_t atype, int lnum)
{
        struct ipadm_addrobj_s  aobj;

        i_ipadm_init_addr(&aobj, ifname, aobjname, atype);
        aobj.ipadm_af = af;
        aobj.ipadm_lifnum = lnum;
        return (i_ipadm_delete_addrobj(iph, &aobj, IPADM_OPT_ACTIVE));
}

/*
 * Gets all the addresses from active configuration and populates the
 * address information in `addrinfo'.
 */
static ipadm_status_t
i_ipadm_active_addr_info(ipadm_handle_t iph, const char *ifname,
    ipadm_addr_info_t **addrinfo, uint32_t ipadm_flags, int64_t lifc_flags)
{
        ipadm_status_t          status;
        struct ifaddrs          *ifap, *ifa;
        ipadm_addr_info_t       *curr, *prev = NULL;
        struct ifaddrs          *cifaddr;
        struct lifreq           lifr;
        int                     sock;
        uint64_t                flags;
        char                    cifname[LIFNAMSIZ];
        struct sockaddr_in6     *sin6;
        struct ipadm_addrobj_s  ipaddr;
        char                    *sep;
        int                     lnum;

retry:
        *addrinfo = NULL;

        /* Get all the configured addresses */
        if (getallifaddrs(AF_UNSPEC, &ifa, lifc_flags) < 0)
                return (ipadm_errno2status(errno));
        /* Return if there is nothing to process. */
        if (ifa == NULL)
                return (IPADM_SUCCESS);
        bzero(&lifr, sizeof (lifr));
        for (ifap = ifa; ifap != NULL; ifap = ifap->ifa_next) {
                struct sockaddr_storage data;

                (void) strlcpy(cifname, ifap->ifa_name, sizeof (cifname));
                lnum = 0;
                if ((sep = strrchr(cifname, ':')) != NULL) {
                        *sep++ = '\0';
                        lnum = atoi(sep);
                }
                if (ifname != NULL && strcmp(cifname, ifname) != 0)
                        continue;
                if (!(ipadm_flags & IPADM_OPT_ZEROADDR) &&
                    sockaddrunspec(ifap->ifa_addr) &&
                    !(ifap->ifa_flags & IFF_DHCPRUNNING))
                        continue;

                /* Allocate and populate the current node in the list. */
                if ((curr = calloc(1, sizeof (ipadm_addr_info_t))) == NULL)
                        goto fail;

                /* Link to the list in `addrinfo'. */
                if (prev != NULL)
                        prev->ia_ifa.ifa_next = &curr->ia_ifa;
                else
                        *addrinfo = curr;
                prev = curr;

                cifaddr = &curr->ia_ifa;
                if ((cifaddr->ifa_name = strdup(ifap->ifa_name)) == NULL)
                        goto fail;
                cifaddr->ifa_flags = ifap->ifa_flags;
                cifaddr->ifa_addr = malloc(sizeof (struct sockaddr_storage));
                if (cifaddr->ifa_addr == NULL)
                        goto fail;
                (void) memcpy(cifaddr->ifa_addr, ifap->ifa_addr,
                    sizeof (struct sockaddr_storage));
                cifaddr->ifa_netmask = malloc(sizeof (struct sockaddr_storage));
                if (cifaddr->ifa_netmask == NULL)
                        goto fail;
                (void) memcpy(cifaddr->ifa_netmask, ifap->ifa_netmask,
                    sizeof (struct sockaddr_storage));
                if (ifap->ifa_flags & IFF_POINTOPOINT) {
                        cifaddr->ifa_dstaddr = malloc(
                            sizeof (struct sockaddr_storage));
                        if (cifaddr->ifa_dstaddr == NULL)
                                goto fail;
                        (void) memcpy(cifaddr->ifa_dstaddr, ifap->ifa_dstaddr,
                            sizeof (struct sockaddr_storage));
                } else if (ifap->ifa_flags & IFF_BROADCAST) {
                        cifaddr->ifa_broadaddr = malloc(
                            sizeof (struct sockaddr_storage));
                        if (cifaddr->ifa_broadaddr == NULL)
                                goto fail;
                        (void) memcpy(cifaddr->ifa_broadaddr,
                            ifap->ifa_broadaddr,
                            sizeof (struct sockaddr_storage));
                }
                /* Get the addrobj name stored for this logical interface. */
                ipaddr.ipadm_aobjname[0] = '\0';
                (void) strlcpy(ipaddr.ipadm_ifname, cifname,
                    sizeof (ipaddr.ipadm_ifname));
                ipaddr.ipadm_lifnum = lnum;
                ipaddr.ipadm_af = ifap->ifa_addr->sa_family;
                status = i_ipadm_get_lif2addrobj(iph, &ipaddr);

                /*
                 * Find address type from ifa_flags, if we could not get it
                 * from daemon.
                 */
                (void) memcpy(&data, ifap->ifa_addr,
                    sizeof (struct sockaddr_in6));
                sin6 = SIN6(&data);
                flags = ifap->ifa_flags;
                if (status == IPADM_SUCCESS) {
                        (void) strlcpy(curr->ia_aobjname, ipaddr.ipadm_aobjname,
                            sizeof (curr->ia_aobjname));
                        curr->ia_atype = ipaddr.ipadm_atype;
                } else if ((flags & IFF_DHCPRUNNING) && (!(flags & IFF_IPV6) ||
                    !IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))) {
                        curr->ia_atype = IPADM_ADDR_DHCP;
                } else if (flags & IFF_ADDRCONF) {
                        curr->ia_atype = IPADM_ADDR_IPV6_ADDRCONF;
                } else {
                        curr->ia_atype = IPADM_ADDR_STATIC;
                }
                /*
                 * Populate the flags for the active configuration from the
                 * `ifa_flags'.
                 */
                if (!(flags & IFF_UP)) {
                        if (flags & IFF_DUPLICATE)
                                curr->ia_state = IFA_DUPLICATE;
                        else
                                curr->ia_state = IFA_DOWN;
                } else {
                        curr->ia_cflags |= IA_UP;
                        if (flags & IFF_RUNNING) {
                                (void) strlcpy(lifr.lifr_name, ifap->ifa_name,
                                    sizeof (lifr.lifr_name));
                                sock = (ifap->ifa_addr->sa_family == AF_INET) ?
                                    iph->iph_sock : iph->iph_sock6;
                                if (ioctl(sock, SIOCGLIFDADSTATE,
                                    (caddr_t)&lifr) < 0) {
                                        if (errno == ENXIO) {
                                                freeifaddrs(ifa);
                                                ipadm_free_addr_info(*addrinfo);
                                                goto retry;
                                        }
                                        goto fail;
                                }
                                if (lifr.lifr_dadstate == DAD_IN_PROGRESS)
                                        curr->ia_state = IFA_TENTATIVE;
                                else
                                        curr->ia_state = IFA_OK;
                        } else {
                                curr->ia_state = IFA_INACCESSIBLE;
                        }
                }
                if (flags & IFF_UNNUMBERED)
                        curr->ia_cflags |= IA_UNNUMBERED;
                if (flags & IFF_PRIVATE)
                        curr->ia_cflags |= IA_PRIVATE;
                if (flags & IFF_TEMPORARY)
                        curr->ia_cflags |= IA_TEMPORARY;
                if (flags & IFF_DEPRECATED)
                        curr->ia_cflags |= IA_DEPRECATED;

        }

        freeifaddrs(ifa);
        return (IPADM_SUCCESS);

fail:
        /* On error, cleanup everything and return. */
        ipadm_free_addr_info(*addrinfo);
        *addrinfo = NULL;
        freeifaddrs(ifa);
        return (ipadm_errno2status(errno));
}

/*
 * From the given `name', i_ipadm_name2atype() deduces the address type
 * and address family. If the `name' implies an address, it returns B_TRUE.
 * Else, returns B_FALSE and leaves the output parameters unchanged.
 */
boolean_t
i_ipadm_name2atype(const char *name, sa_family_t *af, ipadm_addr_type_t *type)
{
        boolean_t       is_addr = B_TRUE;

        if (strcmp(name, IPADM_NVP_IPV4ADDR) == 0) {
                *af = AF_INET;
                *type = IPADM_ADDR_STATIC;
        } else if (strcmp(name, IPADM_NVP_IPV6ADDR) == 0) {
                *af = AF_INET6;
                *type = IPADM_ADDR_STATIC;
        } else if (strcmp(name, IPADM_NVP_DHCP) == 0) {
                *af = AF_INET;
                *type = IPADM_ADDR_DHCP;
        } else if (strcmp(name, IPADM_NVP_INTFID) == 0) {
                *af = AF_INET6;
                *type = IPADM_ADDR_IPV6_ADDRCONF;
        } else {
                is_addr = B_FALSE;
        }

        return (is_addr);
}

/*
 * Parses the given nvlist `nvl' for an address or an address property.
 * The input nvlist must contain either an address or an address property.
 * `ainfo' is an input as well as output parameter. When an address or an
 * address property is found, `ainfo' is updated with the information found.
 * Some of the fields may be already filled in by the calling function.
 *
 * The fields that will be filled/updated by this function are `ia_pflags',
 * `ia_sname' and `ia_dname'. Values for `ia_pflags' are obtained if the `nvl'
 * contains an address property. `ia_sname', `ia_dname', and `ia_pflags' are
 * obtained if `nvl' contains an address.
 */
static ipadm_status_t
i_ipadm_nvl2ainfo_common(nvlist_t *nvl, ipadm_addr_info_t *ainfo)
{
        nvlist_t                *nvladdr;
        char                    *name;
        char                    *propstr = NULL;
        char                    *sname, *dname;
        nvpair_t                *nvp;
        sa_family_t             af;
        ipadm_addr_type_t       atype;
        boolean_t               is_addr = B_FALSE;
        int                     err;

        for (nvp = nvlist_next_nvpair(nvl, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(nvl, nvp)) {
                name = nvpair_name(nvp);
                if (i_ipadm_name2atype(name, &af, &atype)) {
                        err = nvpair_value_nvlist(nvp, &nvladdr);
                        is_addr = B_TRUE;
                } else if (IPADM_PRIV_NVP(name)) {
                        continue;
                } else {
                        err = nvpair_value_string(nvp, &propstr);
                }
                if (err != 0)
                        return (ipadm_errno2status(err));
        }

        if (is_addr) {
                /*
                 * We got an address from the nvlist `nvl'.
                 * Parse `nvladdr' and populate relevant information
                 * in `ainfo'.
                 */
                switch (atype) {
                case IPADM_ADDR_STATIC:
                        if (strcmp(name, "up") == 0 &&
                            strcmp(propstr, "yes") == 0) {
                                ainfo->ia_pflags |= IA_UP;
                        }
                        /*
                         * For static addresses, we need to get the hostnames.
                         */
                        err = nvlist_lookup_string(nvladdr,
                            IPADM_NVP_IPADDRHNAME, &sname);
                        if (err != 0)
                                return (ipadm_errno2status(err));
                        (void) strlcpy(ainfo->ia_sname, sname,
                            sizeof (ainfo->ia_sname));
                        err = nvlist_lookup_string(nvladdr,
                            IPADM_NVP_IPDADDRHNAME, &dname);
                        if (err == 0) {
                                (void) strlcpy(ainfo->ia_dname, dname,
                                    sizeof (ainfo->ia_dname));
                        }
                        break;
                case IPADM_ADDR_DHCP:
                case IPADM_ADDR_IPV6_ADDRCONF:
                        /*
                         * dhcp and addrconf address objects are always
                         * marked up when re-enabled.
                         */
                        ainfo->ia_pflags |= IA_UP;
                        break;
                default:
                        return (IPADM_FAILURE);
                }
        } else {
                /*
                 * We got an address property from `nvl'. Parse the
                 * name and the property value. Update the `ainfo->ia_pflags'
                 * for the flags.
                 */
                if (strcmp(name, "deprecated") == 0) {
                        if (strcmp(propstr, IPADM_ONSTR) == 0)
                                ainfo->ia_pflags |= IA_DEPRECATED;
                } else if (strcmp(name, "private") == 0) {
                        if (strcmp(propstr, IPADM_ONSTR) == 0)
                                ainfo->ia_pflags |= IA_PRIVATE;
                }
        }

        return (IPADM_SUCCESS);
}

/*
 * Parses the given nvlist `nvl' for an address or an address property.
 * The input nvlist must contain either an address or an address property.
 * `ainfo' is an input as well as output parameter. When an address or an
 * address property is found, `ainfo' is updated with the information found.
 * Some of the fields may be already filled in by the calling function,
 * because of previous calls to i_ipadm_nvl2ainfo_active().
 *
 * Since the address object in `nvl' is also in the active configuration, the
 * fields that will be filled/updated by this function are `ia_pflags',
 * `ia_sname' and `ia_dname'.
 *
 * If this function returns an error, the calling function will take
 * care of freeing the fields in `ainfo'.
 */
static ipadm_status_t
i_ipadm_nvl2ainfo_active(nvlist_t *nvl, ipadm_addr_info_t *ainfo)
{
        return (i_ipadm_nvl2ainfo_common(nvl, ainfo));
}

/*
 * Parses the given nvlist `nvl' for an address or an address property.
 * The input nvlist must contain either an address or an address property.
 * `ainfo' is an input as well as output parameter. When an address or an
 * address property is found, `ainfo' is updated with the information found.
 * Some of the fields may be already filled in by the calling function,
 * because of previous calls to i_ipadm_nvl2ainfo_persist().
 *
 * All the relevant fields in `ainfo' will be filled by this function based
 * on what we find in `nvl'.
 *
 * If this function returns an error, the calling function will take
 * care of freeing the fields in `ainfo'.
 */
static ipadm_status_t
i_ipadm_nvl2ainfo_persist(nvlist_t *nvl, ipadm_addr_info_t *ainfo)
{
        nvlist_t                *nvladdr;
        struct ifaddrs          *ifa;
        char                    *name;
        char                    *ifname = NULL;
        char                    *aobjname = NULL;
        char                    *propstr = NULL;
        nvpair_t                *nvp;
        sa_family_t             af;
        ipadm_addr_type_t       atype;
        boolean_t               is_addr = B_FALSE;
        size_t                  size = sizeof (struct sockaddr_storage);
        uint32_t                plen = 0;
        int                     err;
        ipadm_status_t          status;

        status = i_ipadm_nvl2ainfo_common(nvl, ainfo);
        if (status != IPADM_SUCCESS)
                return (status);

        for (nvp = nvlist_next_nvpair(nvl, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(nvl, nvp)) {
                name = nvpair_name(nvp);
                if (strcmp(name, IPADM_NVP_IFNAME) == 0) {
                        err = nvpair_value_string(nvp, &ifname);
                } else if (strcmp(name, IPADM_NVP_AOBJNAME) == 0) {
                        err = nvpair_value_string(nvp, &aobjname);
                } else if (i_ipadm_name2atype(name, &af, &atype)) {
                        err = nvpair_value_nvlist(nvp, &nvladdr);
                        is_addr = B_TRUE;
                } else {
                        err = nvpair_value_string(nvp, &propstr);
                }
                if (err != 0)
                        return (ipadm_errno2status(err));
        }

        ifa = &ainfo->ia_ifa;
        (void) strlcpy(ainfo->ia_aobjname, aobjname,
            sizeof (ainfo->ia_aobjname));
        if (ifa->ifa_name == NULL && (ifa->ifa_name = strdup(ifname)) == NULL)
                return (IPADM_NO_MEMORY);
        if (is_addr) {
                struct sockaddr_in6 data;

                /*
                 * We got an address from the nvlist `nvl'.
                 * Parse `nvladdr' and populate `ifa->ifa_addr'.
                 */
                ainfo->ia_atype = atype;
                if ((ifa->ifa_addr = calloc(1, size)) == NULL)
                        return (IPADM_NO_MEMORY);
                switch (atype) {
                case IPADM_ADDR_STATIC:
                        ifa->ifa_addr->sa_family = af;
                        break;
                case IPADM_ADDR_DHCP:
                        ifa->ifa_addr->sa_family = AF_INET;
                        break;
                case IPADM_ADDR_IPV6_ADDRCONF:
                        data.sin6_family = AF_INET6;
                        if (i_ipadm_nvl2in6_addr(nvladdr, IPADM_NVP_IPNUMADDR,
                            &data.sin6_addr) != IPADM_SUCCESS)
                                return (IPADM_NO_MEMORY);
                        err = nvlist_lookup_uint32(nvladdr, IPADM_NVP_PREFIXLEN,
                            &plen);
                        if (err != 0)
                                return (ipadm_errno2status(err));
                        if ((ifa->ifa_netmask = malloc(size)) == NULL)
                                return (IPADM_NO_MEMORY);
                        if ((err = plen2mask(plen, af, ifa->ifa_netmask)) != 0)
                                return (ipadm_errno2status(err));
                        (void) memcpy(ifa->ifa_addr, &data, sizeof (data));
                        break;
                default:
                        return (IPADM_FAILURE);
                }
        } else {
                if (strcmp(name, "prefixlen") == 0) {
                        /*
                         * If a prefixlen was found, update the
                         * `ainfo->ia_ifa.ifa_netmask'.
                         */

                        if ((ifa->ifa_netmask = malloc(size)) == NULL)
                                return (IPADM_NO_MEMORY);
                        /*
                         * Address property lines always follow the address
                         * line itself in the persistent db. We must have
                         * found a valid `ainfo->ia_ifa.ifa_addr' by now.
                         */
                        assert(ifa->ifa_addr != NULL);
                        err = plen2mask(atoi(propstr), ifa->ifa_addr->sa_family,
                            ifa->ifa_netmask);
                        if (err != 0)
                                return (ipadm_errno2status(err));
                }
        }

        return (IPADM_SUCCESS);
}

/*
 * Retrieves all addresses from active config and appends to it the
 * addresses that are found only in persistent config. In addition,
 * it updates the persistent fields for each address from information
 * found in persistent config. The output parameter `addrinfo' contains
 * complete information regarding all addresses in active as well as
 * persistent config.
 */
static ipadm_status_t
i_ipadm_get_all_addr_info(ipadm_handle_t iph, const char *ifname,
    ipadm_addr_info_t **addrinfo, uint32_t ipadm_flags, int64_t lifc_flags)
{
        nvlist_t                *nvladdr = NULL;
        nvlist_t                *onvl = NULL;
        nvpair_t                *nvp;
        ipadm_status_t          status;
        ipadm_addr_info_t       *ainfo = NULL;
        ipadm_addr_info_t       *curr;
        ipadm_addr_info_t       *last = NULL;
        char                    *aobjname;

        /* Get all addresses from active config. */
        status = i_ipadm_active_addr_info(iph, ifname, &ainfo, ipadm_flags,
            lifc_flags);
        if (status != IPADM_SUCCESS)
                goto fail;

        /* Get all addresses from persistent config. */
        status = i_ipadm_get_db_addr(iph, ifname, NULL, &onvl);
        /*
         * If no address was found in persistent config, just
         * return what we found in active config.
         */
        if (status == IPADM_NOTFOUND) {
                /*
                 * If nothing was found neither active nor persistent
                 * config, this means that the interface does not exist,
                 * if one was provided in `ifname'.
                 */
                if (ainfo == NULL && ifname != NULL)
                        return (IPADM_ENXIO);
                *addrinfo = ainfo;
                return (IPADM_SUCCESS);
        }
        /* In case of any other error, cleanup and return. */
        if (status != IPADM_SUCCESS)
                goto fail;
        /* we append to make sure, loopback addresses are first */
        if (ainfo != NULL) {
                for (curr = ainfo; IA_NEXT(curr) != NULL; curr = IA_NEXT(curr))
                        ;
                last = curr;
        }

        /*
         * `onvl' will contain all the address lines from the db. Each line
         * could contain the address itself or an address property. Addresses
         * and address properties are found in separate lines.
         *
         * If an address A was found in active, we will already have `ainfo',
         * and it is present in persistent configuration as well, we need to
         * update `ainfo' with persistent information (`ia_pflags).
         * For each address B found only in persistent configuration,
         * append the address to the list with the address info for B from
         * `onvl'.
         */
        for (nvp = nvlist_next_nvpair(onvl, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(onvl, nvp)) {
                if (nvpair_value_nvlist(nvp, &nvladdr) != 0)
                        continue;
                if (nvlist_lookup_string(nvladdr, IPADM_NVP_AOBJNAME,
                    &aobjname) != 0)
                        continue;
                for (curr = ainfo; curr != NULL; curr = IA_NEXT(curr)) {
                        if (strcmp(curr->ia_aobjname, aobjname) == 0)
                                break;
                }
                if (curr == NULL) {
                        /*
                         * We did not find this address object in `ainfo'.
                         * This means that the address object exists only
                         * in the persistent configuration. Get its
                         * details and append to `ainfo'.
                         */
                        curr = calloc(1, sizeof (ipadm_addr_info_t));
                        if (curr == NULL)
                                goto fail;
                        curr->ia_state = IFA_DISABLED;
                        if (last != NULL)
                                last->ia_ifa.ifa_next = &curr->ia_ifa;
                        else
                                ainfo = curr;
                        last = curr;
                }
                /*
                 * Fill relevant fields of `curr' from the persistent info
                 * in `nvladdr'. Call the appropriate function based on the
                 * `ia_state' value.
                 */
                if (curr->ia_state == IFA_DISABLED)
                        status = i_ipadm_nvl2ainfo_persist(nvladdr, curr);
                else
                        status = i_ipadm_nvl2ainfo_active(nvladdr, curr);
                if (status != IPADM_SUCCESS)
                        goto fail;
        }
        *addrinfo = ainfo;
        nvlist_free(onvl);
        return (status);
fail:
        /* On error, cleanup and return. */
        nvlist_free(onvl);
        ipadm_free_addr_info(ainfo);
        *addrinfo = NULL;
        return (status);
}

/*
 * Callback function that sets the property `prefixlen' on the address
 * object in `arg' to the value in `pval'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_set_prefixlen(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, const void *pval, uint_t af, uint_t flags)
{
        struct sockaddr_storage netmask;
        struct lifreq           lifr;
        int                     err, s;
        unsigned long           prefixlen, abits;
        char                    *end;
        ipadm_addrobj_t         ipaddr = (ipadm_addrobj_t)arg;

        if (ipaddr->ipadm_atype == IPADM_ADDR_DHCP)
                return (IPADM_NOTSUP);

        errno = 0;
        prefixlen = strtoul(pval, &end, 10);
        if (errno != 0 || *end != '\0')
                return (IPADM_INVALID_ARG);

        abits = (af == AF_INET ? IP_ABITS : IPV6_ABITS);
        if (prefixlen == 0 || prefixlen == (abits - 1))
                return (IPADM_INVALID_ARG);

        if ((err = plen2mask(prefixlen, af, (struct sockaddr *)&netmask)) != 0)
                return (ipadm_errno2status(err));

        s = (af == AF_INET ? iph->iph_sock : iph->iph_sock6);

        bzero(&lifr, sizeof (lifr));
        i_ipadm_addrobj2lifname(ipaddr, lifr.lifr_name,
            sizeof (lifr.lifr_name));
        (void) memcpy(&lifr.lifr_addr, &netmask, sizeof (netmask));
        if (ioctl(s, SIOCSLIFNETMASK, (caddr_t)&lifr) < 0)
                return (ipadm_errno2status(errno));

        /* now, change the broadcast address to reflect the prefixlen */
        if (af == AF_INET) {
                /*
                 * get the interface address and set it, this should reset
                 * the broadcast address.
                 */
                (void) ioctl(s, SIOCGLIFADDR, (caddr_t)&lifr);
                (void) ioctl(s, SIOCSLIFADDR, (caddr_t)&lifr);
        }

        return (IPADM_SUCCESS);
}


/*
 * Callback function that sets the given value `pval' to one of the
 * properties among `deprecated', `private', and `transmit' as defined in
 * `pdp', on the address object in `arg'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_set_addr_flag(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, const void *pval, uint_t af, uint_t flags)
{
        char            lifname[LIFNAMSIZ];
        uint64_t        on_flags = 0, off_flags = 0;
        boolean_t       on;
        ipadm_addrobj_t ipaddr = (ipadm_addrobj_t)arg;

        if (ipaddr->ipadm_atype == IPADM_ADDR_DHCP &&
            strcmp(pdp->ipd_name, "deprecated") == 0)
                return (IPADM_NOTSUP);

        if (strcmp(pval, IPADM_ONSTR) == 0)
                on = B_TRUE;
        else if (strcmp(pval, IPADM_OFFSTR) == 0)
                on = B_FALSE;
        else
                return (IPADM_INVALID_ARG);

        if (strcmp(pdp->ipd_name, "private") == 0) {
                if (on)
                        on_flags = IFF_PRIVATE;
                else
                        off_flags = IFF_PRIVATE;
        } else if (strcmp(pdp->ipd_name, "transmit") == 0) {
                if (on)
                        off_flags = IFF_NOXMIT;
                else
                        on_flags = IFF_NOXMIT;
        } else if (strcmp(pdp->ipd_name, "deprecated") == 0) {
                if (on)
                        on_flags = IFF_DEPRECATED;
                else
                        off_flags = IFF_DEPRECATED;
        } else {
                return (IPADM_PROP_UNKNOWN);
        }

        i_ipadm_addrobj2lifname(ipaddr, lifname, sizeof (lifname));
        return (i_ipadm_set_flags(iph, lifname, af, on_flags, off_flags));
}

/*
 * Callback function that sets the property `zone' on the address
 * object in `arg' to the value in `pval'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_set_zone(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, const void *pval, uint_t af, uint_t flags)
{
        struct lifreq   lifr;
        zoneid_t        zoneid;
        int             s;

        /*
         * To modify the zone assignment such that it persists across
         * reboots, zonecfg(8) must be used.
         */
        if (flags & IPADM_OPT_PERSIST) {
                return (IPADM_NOTSUP);
        } else if (flags & IPADM_OPT_ACTIVE) {
                /* put logical interface into all zones */
                if (strcmp(pval, "all-zones") == 0) {
                        zoneid = ALL_ZONES;
                } else {
                        /* zone must be ready or running */
                        if ((zoneid = getzoneidbyname(pval)) == -1)
                                return (ipadm_errno2status(errno));
                }
        } else {
                return (IPADM_INVALID_ARG);
        }

        s = (af == AF_INET ? iph->iph_sock : iph->iph_sock6);
        bzero(&lifr, sizeof (lifr));
        i_ipadm_addrobj2lifname((ipadm_addrobj_t)arg, lifr.lifr_name,
            sizeof (lifr.lifr_name));
        lifr.lifr_zoneid = zoneid;
        if (ioctl(s, SIOCSLIFZONE, (caddr_t)&lifr) < 0)
                return (ipadm_errno2status(errno));

        return (IPADM_SUCCESS);
}

/*
 * Callback function that sets the property `reqhost' on the address
 * object in `arg' to the value in `pval'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_set_reqhost(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, const void *pval, uint_t af, uint_t flags)
{
        ipadm_status_t          status;
        ipadm_addrobj_t         ipaddr = (ipadm_addrobj_t)arg;

        if (ipaddr->ipadm_atype != IPADM_ADDR_DHCP)
                return (IPADM_NOTSUP);

        /*
         * If requested to set reqhost just from active config but the
         * address is not in active config, return error.
         */
        if (!(ipaddr->ipadm_flags & IPMGMT_ACTIVE) &&
            (flags & IPADM_OPT_ACTIVE) && !(flags & IPADM_OPT_PERSIST)) {
                return (IPADM_NOTFOUND);
        }

        status = ipadm_set_reqhost(ipaddr, pval);
        if (status != IPADM_SUCCESS)
                return (status);

        if (ipaddr->ipadm_flags & IPMGMT_ACTIVE) {
                status = i_ipadm_refresh_dhcp(ipaddr);

                /*
                 * We do not report a problem for IPADM_DHCP_IPC_TIMEOUT since
                 * it is only a soft error to indicate the caller that the
                 * lease might be renewed after the function returns.
                 */
                if (status != IPADM_SUCCESS && status != IPADM_DHCP_IPC_TIMEOUT)
                        return (status);
        }

        status = i_ipadm_set_aobj_addrprop(iph, ipaddr, flags,
            IPADM_NVP_REQHOST);
        return (status);
}

/*
 * Used by address object property callback functions that need to do a
 * two-stage update because the addrprop is cached on the address object.
 */
static ipadm_status_t
i_ipadm_set_aobj_addrprop(ipadm_handle_t iph, ipadm_addrobj_t ipaddr,
    uint_t flags, const char *propname)
{
        ipadm_status_t  status;
        uint32_t        two_stage_flags;

        /*
         * Send the updated address object information to ipmgmtd, since the
         * cached version of an addrprop resides on an aobjmap, but do
         * not change the ACTIVE/PERSIST state of the aobjmap. Instead, request
         * a two-stage, SET_PROPS update with ACTIVE/PERSIST as the first stage
         * per the existing aobjmap flags and a second stage encoded in
         * IPADM_OPT_PERSIST_PROPS.
         */
        two_stage_flags = (flags | IPADM_OPT_SET_PROPS)
            & ~(IPADM_OPT_ACTIVE | IPADM_OPT_PERSIST);
        if (ipaddr->ipadm_flags & IPMGMT_ACTIVE)
                two_stage_flags |= IPADM_OPT_ACTIVE;
        if (ipaddr->ipadm_flags & IPMGMT_PERSIST)
                two_stage_flags |= IPADM_OPT_PERSIST;
        if (flags & IPADM_OPT_PERSIST)
                two_stage_flags |= IPADM_OPT_PERSIST_PROPS;

        status = i_ipadm_addr_persist(iph, ipaddr, B_FALSE, two_stage_flags,
            propname);
        return (status);
}

/*
 * Callback function that gets the property `broadcast' for the address
 * object in `arg'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_get_broadcast(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, char *buf, uint_t *bufsize, uint_t af,
    uint_t valtype)
{
        struct sockaddr_in      *sin;
        struct lifreq           lifr;
        char                    lifname[LIFNAMSIZ];
        ipadm_addrobj_t         ipaddr = (ipadm_addrobj_t)arg;
        ipadm_status_t          status;
        size_t                  nbytes = 0;
        uint64_t                ifflags = 0;

        i_ipadm_addrobj2lifname(ipaddr, lifname, sizeof (lifname));
        if (ipaddr->ipadm_flags & IPMGMT_ACTIVE) {
                status = i_ipadm_get_flags(iph, lifname, af, &ifflags);
                if (status != IPADM_SUCCESS)
                        return (status);
                if (!(ifflags & IFF_BROADCAST)) {
                        buf[0] = '\0';
                        return (IPADM_SUCCESS);
                }
        }

        switch (valtype) {
        case MOD_PROP_DEFAULT: {
                struct sockaddr_storage mask;
                struct in_addr          broadaddr;
                uint_t                  plen;
                in_addr_t               addr, maddr;
                char                    val[MAXPROPVALLEN];
                uint_t                  valsz = MAXPROPVALLEN;
                ipadm_status_t          status;
                int                     err;
                struct sockaddr_in      *sin;

                if (!(ipaddr->ipadm_flags & IPMGMT_ACTIVE)) {
                        /*
                         * Since the address is unknown we cannot
                         * obtain default prefixlen
                         */
                        if (ipaddr->ipadm_atype == IPADM_ADDR_DHCP ||
                            ipaddr->ipadm_af == AF_INET6) {
                                buf[0] = '\0';
                                return (IPADM_SUCCESS);
                        }
                        /*
                         * For the static address, we get the address from the
                         * persistent db.
                         */
                        status = i_ipadm_get_static_addr_db(iph, ipaddr);
                        if (status != IPADM_SUCCESS)
                                return (status);
                        sin = SIN(&ipaddr->ipadm_static_addr);
                        addr = sin->sin_addr.s_addr;
                } else {
                        /*
                         * If the address object is active, we retrieve the
                         * address from kernel.
                         */
                        bzero(&lifr, sizeof (lifr));
                        (void) strlcpy(lifr.lifr_name, lifname,
                            sizeof (lifr.lifr_name));
                        if (ioctl(iph->iph_sock, SIOCGLIFADDR,
                            (caddr_t)&lifr) < 0)
                                return (ipadm_errno2status(errno));

                        addr = (SIN(&lifr.lifr_addr))->sin_addr.s_addr;
                }
                /*
                 * For default broadcast address, get the address and the
                 * default prefixlen for that address and then compute the
                 * broadcast address.
                 */
                status = i_ipadm_get_prefixlen(iph, arg, NULL, val, &valsz, af,
                    MOD_PROP_DEFAULT);
                if (status != IPADM_SUCCESS)
                        return (status);

                plen = atoi(val);
                if ((err = plen2mask(plen, AF_INET,
                    (struct sockaddr *)&mask)) != 0)
                        return (ipadm_errno2status(err));
                maddr = (SIN(&mask))->sin_addr.s_addr;
                broadaddr.s_addr = (addr & maddr) | ~maddr;
                nbytes = snprintf(buf, *bufsize, "%s", inet_ntoa(broadaddr));
                break;
        }
        case MOD_PROP_ACTIVE:
                bzero(&lifr, sizeof (lifr));
                (void) strlcpy(lifr.lifr_name, lifname,
                    sizeof (lifr.lifr_name));
                if (ioctl(iph->iph_sock, SIOCGLIFBRDADDR,
                    (caddr_t)&lifr) < 0) {
                        return (ipadm_errno2status(errno));
                } else {
                        sin = SIN(&lifr.lifr_addr);
                        nbytes = snprintf(buf, *bufsize, "%s",
                            inet_ntoa(sin->sin_addr));
                }
                break;
        default:
                return (IPADM_INVALID_ARG);
        }
        if (nbytes >= *bufsize) {
                /* insufficient buffer space */
                *bufsize = nbytes + 1;
                return (IPADM_NO_BUFS);
        }
        return (IPADM_SUCCESS);
}

/*
 * Callback function that retrieves the value of the property `prefixlen'
 * for the address object in `arg'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_get_prefixlen(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, char *buf, uint_t *bufsize, uint_t af,
    uint_t valtype)
{
        struct lifreq   lifr;
        ipadm_addrobj_t ipaddr = (ipadm_addrobj_t)arg;
        char            lifname[LIFNAMSIZ];
        int             s;
        uint32_t        prefixlen;
        size_t          nbytes;
        ipadm_status_t  status;
        uint64_t        lifflags;

        i_ipadm_addrobj2lifname(ipaddr, lifname, sizeof (lifname));
        if (ipaddr->ipadm_flags & IPMGMT_ACTIVE) {
                status = i_ipadm_get_flags(iph, lifname, af, &lifflags);
                if (status != IPADM_SUCCESS) {
                        return (status);
                } else if (lifflags & IFF_POINTOPOINT) {
                        buf[0] = '\0';
                        return (status);
                }
        }

        s = (af == AF_INET ? iph->iph_sock : iph->iph_sock6);
        bzero(&lifr, sizeof (lifr));
        (void) strlcpy(lifr.lifr_name, lifname, sizeof (lifr.lifr_name));
        switch (valtype) {
        case MOD_PROP_POSSIBLE:
                if (af == AF_INET)
                        nbytes = snprintf(buf, *bufsize, "1-30,32");
                else
                        nbytes = snprintf(buf, *bufsize, "1-126,128");
                break;
        case MOD_PROP_DEFAULT:
                if (ipaddr->ipadm_flags & IPMGMT_ACTIVE) {
                        /*
                         * For static addresses, we retrieve the address
                         * from kernel if it is active.
                         */
                        if (ioctl(s, SIOCGLIFADDR, (caddr_t)&lifr) < 0)
                                return (ipadm_errno2status(errno));
                        status = i_ipadm_get_default_prefixlen(
                            &lifr.lifr_addr, &prefixlen);
                        if (status != IPADM_SUCCESS)
                                return (status);
                } else if ((ipaddr->ipadm_flags & IPMGMT_PERSIST) &&
                    ipaddr->ipadm_atype == IPADM_ADDR_DHCP) {
                        /*
                         * Since the address is unknown we cannot
                         * obtain default prefixlen
                         */
                        buf[0] = '\0';
                        return (IPADM_SUCCESS);
                } else {
                        /*
                         * If not in active config, we use the address
                         * from persistent store.
                         */
                        status = i_ipadm_get_static_addr_db(iph, ipaddr);
                        if (status != IPADM_SUCCESS)
                                return (status);
                        status = i_ipadm_get_default_prefixlen(
                            &ipaddr->ipadm_static_addr, &prefixlen);
                        if (status != IPADM_SUCCESS)
                                return (status);
                }
                nbytes = snprintf(buf, *bufsize, "%u", prefixlen);
                break;
        case MOD_PROP_ACTIVE:
                if (ioctl(s, SIOCGLIFNETMASK, (caddr_t)&lifr) < 0)
                        return (ipadm_errno2status(errno));
                prefixlen = lifr.lifr_addrlen;
                nbytes = snprintf(buf, *bufsize, "%u", prefixlen);
                break;
        default:
                return (IPADM_INVALID_ARG);
        }
        if (nbytes >= *bufsize) {
                /* insufficient buffer space */
                *bufsize = nbytes + 1;
                return (IPADM_NO_BUFS);
        }
        return (IPADM_SUCCESS);
}

/*
 * Callback function that retrieves the value of one of the properties
 * among `deprecated', `private', and `transmit' for the address object
 * in `arg'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_get_addr_flag(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, char *buf, uint_t *bufsize, uint_t af,
    uint_t valtype)
{
        boolean_t       on = B_FALSE;
        char            lifname[LIFNAMSIZ];
        ipadm_status_t  status = IPADM_SUCCESS;
        uint64_t        ifflags;
        size_t          nbytes;
        ipadm_addrobj_t ipaddr = (ipadm_addrobj_t)arg;

        switch (valtype) {
        case MOD_PROP_DEFAULT:
                if (strcmp(pdp->ipd_name, "private") == 0 ||
                    strcmp(pdp->ipd_name, "deprecated") == 0) {
                        on = B_FALSE;
                } else if (strcmp(pdp->ipd_name, "transmit") == 0) {
                        on = B_TRUE;
                } else {
                        return (IPADM_PROP_UNKNOWN);
                }
                break;
        case MOD_PROP_ACTIVE:
                /*
                 * If the address is present in active configuration, we
                 * retrieve it from kernel to get the property value.
                 * Else, there is no value to return.
                 */
                i_ipadm_addrobj2lifname(ipaddr, lifname, sizeof (lifname));
                status = i_ipadm_get_flags(iph, lifname, af, &ifflags);
                if (status != IPADM_SUCCESS)
                        return (status);
                if (strcmp(pdp->ipd_name, "private") == 0)
                        on = (ifflags & IFF_PRIVATE);
                else if (strcmp(pdp->ipd_name, "transmit") == 0)
                        on = !(ifflags & IFF_NOXMIT);
                else if (strcmp(pdp->ipd_name, "deprecated") == 0)
                        on = (ifflags & IFF_DEPRECATED);
                break;
        default:
                return (IPADM_INVALID_ARG);
        }
        nbytes = snprintf(buf, *bufsize, "%s",
            (on ? IPADM_ONSTR : IPADM_OFFSTR));
        if (nbytes >= *bufsize) {
                /* insufficient buffer space */
                *bufsize = nbytes + 1;
                status = IPADM_NO_BUFS;
        }

        return (status);
}

/*
 * Callback function that retrieves the value of the property `zone'
 * for the address object in `arg'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_get_zone(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, char *buf, uint_t *bufsize, uint_t af,
    uint_t valtype)
{
        struct lifreq   lifr;
        char            zone_name[ZONENAME_MAX];
        int             s;
        size_t          nbytes = 0;

        if (iph->iph_zoneid != GLOBAL_ZONEID) {
                buf[0] = '\0';
                return (IPADM_SUCCESS);
        }

        /*
         * we are in global zone. See if the lifname is assigned to shared-ip
         * zone or global zone.
         */
        switch (valtype) {
        case MOD_PROP_DEFAULT:
                if (getzonenamebyid(GLOBAL_ZONEID, zone_name,
                    sizeof (zone_name)) > 0)
                        nbytes = snprintf(buf, *bufsize, "%s", zone_name);
                else
                        return (ipadm_errno2status(errno));
                break;
        case MOD_PROP_ACTIVE:
                bzero(&lifr, sizeof (lifr));
                i_ipadm_addrobj2lifname((ipadm_addrobj_t)arg, lifr.lifr_name,
                    sizeof (lifr.lifr_name));
                s = (af == AF_INET ? iph->iph_sock : iph->iph_sock6);

                if (ioctl(s, SIOCGLIFZONE, (caddr_t)&lifr) == -1)
                        return (ipadm_errno2status(errno));

                if (lifr.lifr_zoneid == ALL_ZONES) {
                        nbytes = snprintf(buf, *bufsize, "%s", "all-zones");
                } else if (getzonenamebyid(lifr.lifr_zoneid, zone_name,
                    sizeof (zone_name)) < 0) {
                        return (ipadm_errno2status(errno));
                } else {
                        nbytes = snprintf(buf, *bufsize, "%s", zone_name);
                }
                break;
        default:
                return (IPADM_INVALID_ARG);
        }
        if (nbytes >= *bufsize) {
                /* insufficient buffer space */
                *bufsize = nbytes + 1;
                return (IPADM_NO_BUFS);
        }

        return (IPADM_SUCCESS);
}

/*
 * Callback function that retrieves the value of the property `primary'
 * for the address object in `arg'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_get_primary(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, char *buf, uint_t *bufsize, uint_t af,
    uint_t valtype)
{
        ipadm_addrobj_t ipaddr = (ipadm_addrobj_t)arg;
        const char              *onoff = "";
        size_t                  nbytes;

        switch (valtype) {
        case MOD_PROP_DEFAULT:
                if (ipaddr->ipadm_atype == IPADM_ADDR_DHCP)
                        onoff = IPADM_OFFSTR;
                break;
        case MOD_PROP_ACTIVE:
                if (ipaddr->ipadm_atype == IPADM_ADDR_DHCP) {
                        dhcp_status_t   dhcp_status;
                        ipadm_status_t  ipc_status;
                        int                     error;

                        ipc_status = i_ipadm_dhcp_status(ipaddr, &dhcp_status,
                            &error);
                        if (ipc_status != IPADM_SUCCESS &&
                            ipc_status != IPADM_NOTFOUND)
                                return (ipc_status);

                        onoff = dhcp_status.if_dflags & DHCP_IF_PRIMARY ?
                            IPADM_ONSTR : IPADM_OFFSTR;
                }
                break;
        default:
                return (IPADM_INVALID_ARG);
        }

        nbytes = strlcpy(buf, onoff, *bufsize);
        if (nbytes >= *bufsize) {
                /* insufficient buffer space */
                *bufsize = nbytes + 1;
                return (IPADM_NO_BUFS);
        }

        return (IPADM_SUCCESS);
}

/*
 * Callback function that retrieves the value of the property `reqhost'
 * for the address object in `arg'.
 */
/* ARGSUSED */
static ipadm_status_t
i_ipadm_get_reqhost(ipadm_handle_t iph, const void *arg,
    ipadm_prop_desc_t *pdp, char *buf, uint_t *bufsize, uint_t af,
    uint_t valtype)
{
        ipadm_addrobj_t ipaddr = (ipadm_addrobj_t)arg;
        const char      *reqhost = "";
        size_t          nbytes;

        switch (valtype) {
        case MOD_PROP_DEFAULT:
                break;
        case MOD_PROP_ACTIVE:
                if (ipaddr->ipadm_atype == IPADM_ADDR_DHCP)
                        reqhost = ipaddr->ipadm_reqhost;
                break;
        default:
                return (IPADM_INVALID_ARG);
        }

        nbytes = strlcpy(buf, reqhost, *bufsize);
        if (nbytes >= *bufsize) {
                /* insufficient buffer space */
                *bufsize = nbytes + 1;
                return (IPADM_NO_BUFS);
        }

        return (IPADM_SUCCESS);
}

static ipadm_prop_desc_t *
i_ipadm_get_addrprop_desc(const char *pname)
{
        int i;

        for (i = 0; ipadm_addrprop_table[i].ipd_name != NULL; i++) {
                if (strcmp(pname, ipadm_addrprop_table[i].ipd_name) == 0 ||
                    (ipadm_addrprop_table[i].ipd_old_name != NULL &&
                    strcmp(pname, ipadm_addrprop_table[i].ipd_old_name) == 0))
                        return (&ipadm_addrprop_table[i]);
        }
        return (NULL);
}

/*
 * Gets the value of the given address property `pname' for the address
 * object with name `aobjname'.
 */
ipadm_status_t
ipadm_get_addrprop(ipadm_handle_t iph, const char *pname, char *buf,
    uint_t *bufsize, const char *aobjname, uint_t valtype)
{
        struct ipadm_addrobj_s  ipaddr;
        ipadm_status_t          status = IPADM_SUCCESS;
        sa_family_t             af;
        ipadm_prop_desc_t       *pdp = NULL;

        if (iph == NULL || pname == NULL || buf == NULL ||
            bufsize == NULL || *bufsize == 0 || aobjname == NULL) {
                return (IPADM_INVALID_ARG);
        }

        /* find the property in the property description table */
        if ((pdp = i_ipadm_get_addrprop_desc(pname)) == NULL)
                return (IPADM_PROP_UNKNOWN);

        /*
         * For the given aobjname, get the addrobj it represents and
         * retrieve the property value for that object.
         */
        i_ipadm_init_addr(&ipaddr, "", aobjname, IPADM_ADDR_NONE);
        if ((status = i_ipadm_get_addrobj(iph, &ipaddr)) != IPADM_SUCCESS)
                return (status);

        if (ipaddr.ipadm_atype == IPADM_ADDR_IPV6_ADDRCONF)
                return (IPADM_NOTSUP);
        af = ipaddr.ipadm_af;

        /*
         * Call the appropriate callback function to based on the field
         * that was asked for.
         */
        switch (valtype) {
        case IPADM_OPT_PERM:
                status = i_ipadm_pd2permstr(pdp, buf, bufsize);
                break;
        case IPADM_OPT_ACTIVE:
                if (!(ipaddr.ipadm_flags & IPMGMT_ACTIVE)) {
                        buf[0] = '\0';
                } else {
                        status = pdp->ipd_get(iph, &ipaddr, pdp, buf, bufsize,
                            af, MOD_PROP_ACTIVE);
                }
                break;
        case IPADM_OPT_DEFAULT:
                status = pdp->ipd_get(iph, &ipaddr, pdp, buf, bufsize,
                    af, MOD_PROP_DEFAULT);
                break;
        case IPADM_OPT_POSSIBLE:
                if (pdp->ipd_get_range != NULL) {
                        status = pdp->ipd_get_range(iph, &ipaddr, pdp, buf,
                            bufsize, af, MOD_PROP_POSSIBLE);
                        break;
                }
                buf[0] = '\0';
                break;
        case IPADM_OPT_PERSIST:
                status = i_ipadm_get_persist_propval(iph, pdp, buf, bufsize,
                    &ipaddr);
                break;
        default:
                status = IPADM_INVALID_ARG;
                break;
        }

        return (status);
}

/*
 * Sets the value of the given address property `pname' to `pval' for the
 * address object with name `aobjname'.
 */
ipadm_status_t
ipadm_set_addrprop(ipadm_handle_t iph, const char *pname,
    const char *pval, const char *aobjname, uint_t pflags)
{
        struct ipadm_addrobj_s  ipaddr;
        sa_family_t             af;
        ipadm_prop_desc_t       *pdp = NULL;
        char                    defbuf[MAXPROPVALLEN];
        uint_t                  defbufsize = MAXPROPVALLEN;
        boolean_t               reset = (pflags & IPADM_OPT_DEFAULT);
        ipadm_status_t          status = IPADM_SUCCESS;

        /* Check for solaris.network.interface.config authorization */
        if (!ipadm_check_auth())
                return (IPADM_EAUTH);

        if (iph == NULL || pname == NULL || aobjname == NULL || pflags == 0 ||
            pflags == IPADM_OPT_PERSIST ||
            (pflags & ~(IPADM_COMMON_OPT_MASK|IPADM_OPT_DEFAULT)) ||
            (!reset && pval == NULL)) {
                return (IPADM_INVALID_ARG);
        }

        /* find the property in the property description table */
        if ((pdp = i_ipadm_get_addrprop_desc(pname)) == NULL)
                return (IPADM_PROP_UNKNOWN);

        if (pdp->ipd_set == NULL || (reset && pdp->ipd_get == NULL))
                return (IPADM_NOTSUP);

        if (!(pdp->ipd_flags & IPADMPROP_MULVAL) &&
            (pflags & (IPADM_OPT_APPEND|IPADM_OPT_REMOVE))) {
                return (IPADM_INVALID_ARG);
        }

        /*
         * For the given aobjname, get the addrobj it represents and
         * set the property value for that object.
         */
        i_ipadm_init_addr(&ipaddr, "", aobjname, IPADM_ADDR_NONE);
        if ((status = i_ipadm_get_addrobj(iph, &ipaddr)) != IPADM_SUCCESS)
                return (status);

        if (!(ipaddr.ipadm_flags & IPMGMT_ACTIVE))
                return (IPADM_OP_DISABLE_OBJ);

        /* Persistent operation not allowed on a temporary object. */
        if ((pflags & IPADM_OPT_PERSIST) &&
            !(ipaddr.ipadm_flags & IPMGMT_PERSIST))
                return (IPADM_TEMPORARY_OBJ);

        /*
         * Currently, setting an address property on an address object of type
         * IPADM_ADDR_IPV6_ADDRCONF is not supported. Supporting it involves
         * in.ndpd retrieving the address properties from ipmgmtd for given
         * address object and then setting them on auto-configured addresses,
         * whenever in.ndpd gets a new prefix. This will be supported in
         * future releases.
         */
        if (ipaddr.ipadm_atype == IPADM_ADDR_IPV6_ADDRCONF)
                return (IPADM_NOTSUP);

        /*
         * Setting an address property on an address object that is
         * not present in active configuration is not supported.
         */
        if (!(ipaddr.ipadm_flags & IPMGMT_ACTIVE))
                return (IPADM_NOTSUP);

        af = ipaddr.ipadm_af;
        if (reset) {
                /*
                 * If we were asked to reset the value, we need to fetch
                 * the default value and set the default value.
                 */
                status = pdp->ipd_get(iph, &ipaddr, pdp, defbuf, &defbufsize,
                    af, MOD_PROP_DEFAULT);
                if (status != IPADM_SUCCESS)
                        return (status);
                pval = defbuf;
        }
        /* set the user provided or default property value */
        status = pdp->ipd_set(iph, &ipaddr, pdp, pval, af, pflags);
        if (status != IPADM_SUCCESS)
                return (status);

        /*
         * If IPADM_OPT_PERSIST was set in `flags', we need to store
         * property and its value in persistent DB.
         */
        if (pflags & IPADM_OPT_PERSIST) {
                status = i_ipadm_persist_propval(iph, pdp, pval, &ipaddr,
                    pflags);
        }

        return (status);
}

/*
 * Remove the address specified by the address object in `addr'
 * from kernel. If the address is on a non-zero logical interface, we do a
 * SIOCLIFREMOVEIF, otherwise we set the address to INADDR_ANY for IPv4 or
 * :: for IPv6.
 */
ipadm_status_t
i_ipadm_delete_addr(ipadm_handle_t iph, ipadm_addrobj_t addr)
{
        struct lifreq   lifr;
        int             sock;
        ipadm_status_t  status;

        bzero(&lifr, sizeof (lifr));
        i_ipadm_addrobj2lifname(addr, lifr.lifr_name, sizeof (lifr.lifr_name));
        sock = (addr->ipadm_af == AF_INET ? iph->iph_sock : iph->iph_sock6);
        if (addr->ipadm_lifnum == 0) {
                /*
                 * Fake the deletion of the 0'th address by
                 * clearing IFF_UP and setting it to as 0.0.0.0 or ::.
                 */
                status = i_ipadm_set_flags(iph, addr->ipadm_ifname,
                    addr->ipadm_af, 0, IFF_UP);
                if (status != IPADM_SUCCESS)
                        return (status);
                bzero(&lifr.lifr_addr, sizeof (lifr.lifr_addr));
                lifr.lifr_addr.ss_family = addr->ipadm_af;
                if (ioctl(sock, SIOCSLIFADDR, (caddr_t)&lifr) < 0)
                        return (ipadm_errno2status(errno));
                if (ioctl(sock, SIOCSLIFDSTADDR, (caddr_t)&lifr) < 0)
                        return (ipadm_errno2status(errno));
        } else if (ioctl(sock, SIOCLIFREMOVEIF, (caddr_t)&lifr) < 0) {
                return (ipadm_errno2status(errno));
        }

        return (IPADM_SUCCESS);
}

/*
 * Extracts the IPv6 address from the nvlist in `nvl'.
 */
ipadm_status_t
i_ipadm_nvl2in6_addr(nvlist_t *nvl, char *addr_type, in6_addr_t *in6_addr)
{
        uint8_t *addr6;
        uint_t  n;

        if (nvlist_lookup_uint8_array(nvl, addr_type, &addr6, &n) != 0)
                return (IPADM_NOTFOUND);
        assert(n == 16);
        bcopy(addr6, in6_addr->s6_addr, n);
        return (IPADM_SUCCESS);
}

/*
 * Used to validate the given addrobj name string. Length of `aobjname'
 * cannot exceed IPADM_AOBJ_USTRSIZ. `aobjname' should start with an
 * alphabetic character and it can only contain alphanumeric characters.
 */
static boolean_t
i_ipadm_is_user_aobjname_valid(const char *aobjname)
{
        const char      *cp;

        if (aobjname == NULL || strlen(aobjname) >= IPADM_AOBJ_USTRSIZ ||
            !isalpha(*aobjname)) {
                return (B_FALSE);
        }
        for (cp = aobjname + 1; *cp && isalnum(*cp); cp++)
                ;
        return (*cp == '\0');
}

/*
 * Computes the prefixlen for the given `addr' based on the netmask found using
 * the order specified in /etc/nsswitch.conf. If not found, then the
 * prefixlen is computed using the Classful subnetting semantics defined
 * in RFC 791 for IPv4 and RFC 4291 for IPv6.
 */
static ipadm_status_t
i_ipadm_get_default_prefixlen(struct sockaddr_storage *addr, uint32_t *plen)
{
        sa_family_t af = addr->ss_family;
        struct sockaddr_storage mask;
        struct sockaddr_in *m = (struct sockaddr_in *)&mask;
        struct sockaddr_in6 *sin6;
        struct sockaddr_in *sin;
        struct in_addr ia;
        uint32_t prefixlen = 0;

        switch (af) {
        case AF_INET:
                sin = SIN(addr);
                ia.s_addr = ntohl(sin->sin_addr.s_addr);
                get_netmask4(&ia, &m->sin_addr);
                m->sin_addr.s_addr = htonl(m->sin_addr.s_addr);
                m->sin_family = AF_INET;
                prefixlen = mask2plen((struct sockaddr *)&mask);
                break;
        case AF_INET6:
                sin6 = SIN6(addr);
                if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
                        prefixlen = 10;
                else
                        prefixlen = 64;
                break;
        default:
                return (IPADM_INVALID_ARG);
        }
        *plen = prefixlen;
        return (IPADM_SUCCESS);
}

ipadm_status_t
i_ipadm_resolve_addr(const char *name, sa_family_t af,
    struct sockaddr_storage *ss)
{
        struct addrinfo hints, *ai;
        int rc;
        struct sockaddr_in6 *sin6;
        struct sockaddr_in *sin;
        boolean_t is_mapped;

        (void) memset(&hints, 0, sizeof (hints));
        hints.ai_family = af;
        hints.ai_flags = (AI_ALL | AI_V4MAPPED);
        rc = getaddrinfo(name, NULL, &hints, &ai);
        if (rc != 0) {
                if (rc == EAI_NONAME)
                        return (IPADM_BAD_ADDR);
                else
                        return (IPADM_FAILURE);
        }
        if (ai->ai_next != NULL) {
                /* maps to more than one hostname */
                freeaddrinfo(ai);
                return (IPADM_BAD_HOSTNAME);
        }
        /* LINTED E_BAD_PTR_CAST_ALIGN */
        is_mapped = IN6_IS_ADDR_V4MAPPED(&(SIN6(ai->ai_addr))->sin6_addr);
        if (is_mapped) {
                sin = SIN(ss);
                sin->sin_family = AF_INET;
                /* LINTED E_BAD_PTR_CAST_ALIGN */
                IN6_V4MAPPED_TO_INADDR(&(SIN6(ai->ai_addr))->sin6_addr,
                    &sin->sin_addr);
        } else {
                sin6 = SIN6(ss);
                sin6->sin6_family = AF_INET6;
                bcopy(ai->ai_addr, sin6, sizeof (*sin6));
        }
        freeaddrinfo(ai);
        return (IPADM_SUCCESS);
}

/*
 * This takes a static address string <addr>[/<mask>] or a hostname
 * and maps it to a single numeric IP address, consulting DNS if
 * hostname was provided. If a specific address family was requested,
 * an error is returned if the given hostname does not map to an address
 * of the given family. Note that this function returns failure
 * if the name maps to more than one IP address.
 */
ipadm_status_t
ipadm_set_addr(ipadm_addrobj_t ipaddr, const char *astr, sa_family_t af)
{
        char            *prefixlenstr;
        uint32_t        prefixlen = 0;
        char            *endp;
        /*
         * We use (NI_MAXHOST + 5) because the longest possible
         * astr will have (NI_MAXHOST + '/' + {a maximum of 32 for IPv4
         * or a maximum of 128 for IPv6 + '\0') chars
         */
        char            addrstr[NI_MAXHOST + 5];
        ipadm_status_t  status;

        (void) snprintf(addrstr, sizeof (addrstr), "%s", astr);
        if ((prefixlenstr = strchr(addrstr, '/')) != NULL) {
                *prefixlenstr++ = '\0';
                errno = 0;
                prefixlen = strtoul(prefixlenstr, &endp, 10);
                if (errno != 0 || *endp != '\0')
                        return (IPADM_INVALID_ARG);
                if ((af == AF_INET && prefixlen > IP_ABITS) ||
                    (af == AF_INET6 && prefixlen > IPV6_ABITS))
                        return (IPADM_INVALID_ARG);
        }

        status = i_ipadm_resolve_addr(addrstr, af, &ipaddr->ipadm_static_addr);
        if (status == IPADM_SUCCESS) {
                (void) strlcpy(ipaddr->ipadm_static_aname, addrstr,
                    sizeof (ipaddr->ipadm_static_aname));
                ipaddr->ipadm_af = ipaddr->ipadm_static_addr.ss_family;
                ipaddr->ipadm_static_prefixlen = prefixlen;
        }
        return (status);
}

/*
 * Gets the static source address from the address object in `ipaddr'.
 * Memory for `addr' should be already allocated by the caller.
 */
ipadm_status_t
ipadm_get_addr(const ipadm_addrobj_t ipaddr, struct sockaddr_storage *addr)
{
        if (ipaddr == NULL || ipaddr->ipadm_atype != IPADM_ADDR_STATIC ||
            addr == NULL) {
                return (IPADM_INVALID_ARG);
        }
        *addr = ipaddr->ipadm_static_addr;

        return (IPADM_SUCCESS);
}

/*
 * Set up tunnel destination address in ipaddr by contacting DNS.
 * The function works similar to ipadm_set_addr().
 * The dst_addr must resolve to exactly one address. IPADM_BAD_ADDR is returned
 * if dst_addr resolves to more than one address. The caller has to verify
 * that ipadm_static_addr and ipadm_static_dst_addr have the same ss_family
 */
ipadm_status_t
ipadm_set_dst_addr(ipadm_addrobj_t ipaddr, const char *daddrstr, sa_family_t af)
{
        ipadm_status_t  status;

        /* mask lengths are not meaningful for point-to-point interfaces. */
        if (strchr(daddrstr, '/') != NULL)
                return (IPADM_BAD_ADDR);

        status = i_ipadm_resolve_addr(daddrstr, af,
            &ipaddr->ipadm_static_dst_addr);
        if (status == IPADM_SUCCESS) {
                (void) strlcpy(ipaddr->ipadm_static_dname, daddrstr,
                    sizeof (ipaddr->ipadm_static_dname));
        }
        return (status);
}

/*
 * Sets the interface ID in the address object `ipaddr' with the address
 * in the string `interface_id'. This interface ID will be used when
 * ipadm_create_addr() is called with `ipaddr' with address type
 * set to IPADM_ADDR_IPV6_ADDRCONF.
 */
ipadm_status_t
ipadm_set_interface_id(ipadm_addrobj_t ipaddr, const char *interface_id)
{
        struct sockaddr_in6     *sin6;
        char                    *end;
        char                    *cp;
        uint32_t                prefixlen;
        char                    addrstr[INET6_ADDRSTRLEN + 1];

        if (ipaddr == NULL || interface_id == NULL ||
            ipaddr->ipadm_atype != IPADM_ADDR_IPV6_ADDRCONF)
                return (IPADM_INVALID_ARG);

        (void) strlcpy(addrstr, interface_id, sizeof (addrstr));
        if ((cp = strchr(addrstr, '/')) == NULL)
                return (IPADM_INVALID_ARG);
        *cp++ = '\0';
        sin6 = &ipaddr->ipadm_intfid;
        if (inet_pton(AF_INET6, addrstr, &sin6->sin6_addr) == 1) {
                errno = 0;
                prefixlen = strtoul(cp, &end, 10);
                if (errno != 0 || *end != '\0' || prefixlen > IPV6_ABITS)
                        return (IPADM_INVALID_ARG);
                sin6->sin6_family = AF_INET6;
                ipaddr->ipadm_intfidlen = prefixlen;
                return (IPADM_SUCCESS);
        }
        return (IPADM_INVALID_ARG);
}

/*
 * Sets the value for the field `ipadm_stateless' in address object `ipaddr'.
 */
ipadm_status_t
ipadm_set_stateless(ipadm_addrobj_t ipaddr, boolean_t stateless)
{
        if (ipaddr == NULL ||
            ipaddr->ipadm_atype != IPADM_ADDR_IPV6_ADDRCONF)
                return (IPADM_INVALID_ARG);
        ipaddr->ipadm_stateless = stateless;

        return (IPADM_SUCCESS);
}

/*
 * Sets the value for the field `ipadm_stateful' in address object `ipaddr'.
 */
ipadm_status_t
ipadm_set_stateful(ipadm_addrobj_t ipaddr, boolean_t stateful)
{
        if (ipaddr == NULL ||
            ipaddr->ipadm_atype != IPADM_ADDR_IPV6_ADDRCONF)
                return (IPADM_INVALID_ARG);
        ipaddr->ipadm_stateful = stateful;

        return (IPADM_SUCCESS);
}

/*
 * Sets the dhcp parameter `ipadm_primary' in the address object `ipaddr'.
 * The field is used during the address creation with address
 * type IPADM_ADDR_DHCP. It specifies if the interface should be set
 * as a primary interface for getting dhcp global options from the DHCP server.
 */
ipadm_status_t
ipadm_set_primary(ipadm_addrobj_t ipaddr, boolean_t primary)
{
        if (ipaddr == NULL || ipaddr->ipadm_atype != IPADM_ADDR_DHCP)
                return (IPADM_INVALID_ARG);
        ipaddr->ipadm_primary = primary;

        return (IPADM_SUCCESS);
}

/*
 * Sets the dhcp parameter `ipadm_wait' in the address object `ipaddr'.
 * This field is used during the address creation with address type
 * IPADM_ADDR_DHCP. It specifies how long the API ipadm_create_addr()
 * should wait before returning while the dhcp address is being acquired
 * by the dhcpagent.
 * Possible values:
 * - IPADM_DHCP_WAIT_FOREVER : Do not return until dhcpagent returns.
 * - IPADM_DHCP_WAIT_DEFAULT : Wait a default amount of time before returning.
 * - <integer>     : Wait the specified number of seconds before returning.
 */
ipadm_status_t
ipadm_set_wait_time(ipadm_addrobj_t ipaddr, int32_t wait)
{
        if (ipaddr == NULL || ipaddr->ipadm_atype != IPADM_ADDR_DHCP)
                return (IPADM_INVALID_ARG);
        ipaddr->ipadm_wait = wait;
        return (IPADM_SUCCESS);
}

/*
 * Sets the dhcp parameter `ipadm_reqhost' in the address object `ipaddr',
 * but validate any non-nil value using ipadm_is_valid_hostname() and also
 * check length.
 */
ipadm_status_t
ipadm_set_reqhost(ipadm_addrobj_t ipaddr, const char *reqhost)
{
        const size_t HNLEN = sizeof (ipaddr->ipadm_reqhost);

        if (ipaddr == NULL || ipaddr->ipadm_atype != IPADM_ADDR_DHCP)
                return (IPADM_INVALID_ARG);

        if (ipadm_is_nil_hostname(reqhost))
                *ipaddr->ipadm_reqhost = '\0';
        else if (!ipadm_is_valid_hostname(reqhost))
                return (IPADM_INVALID_ARG);
        else if (strlcpy(ipaddr->ipadm_reqhost, reqhost, HNLEN) >= HNLEN)
                return (IPADM_INVALID_ARG);
        return (IPADM_SUCCESS);
}

/*
 * Creates a placeholder for the `ipadm_aobjname' in the ipmgmtd `aobjmap'.
 * If the `aobjname' already exists in the daemon's `aobjmap' then
 * IPADM_ADDROBJ_EXISTS will be returned.
 *
 * If the libipadm consumer set `ipaddr.ipadm_aobjname[0]' to `\0', then the
 * daemon will generate an `aobjname' for the given `ipaddr'.
 */
ipadm_status_t
i_ipadm_lookupadd_addrobj(ipadm_handle_t iph, ipadm_addrobj_t ipaddr)
{
        ipmgmt_aobjop_arg_t     larg;
        ipmgmt_aobjop_rval_t    rval, *rvalp;
        int                     err;

        bzero(&larg, sizeof (larg));
        larg.ia_cmd = IPMGMT_CMD_ADDROBJ_LOOKUPADD;
        (void) strlcpy(larg.ia_aobjname, ipaddr->ipadm_aobjname,
            sizeof (larg.ia_aobjname));
        (void) strlcpy(larg.ia_ifname, ipaddr->ipadm_ifname,
            sizeof (larg.ia_ifname));
        larg.ia_family = ipaddr->ipadm_af;
        larg.ia_atype = ipaddr->ipadm_atype;

        rvalp = &rval;
        err = ipadm_door_call(iph, &larg, sizeof (larg), (void **)&rvalp,
            sizeof (rval), B_FALSE);
        if (err == 0 && ipaddr->ipadm_aobjname[0] == '\0') {
                /* copy the daemon generated `aobjname' into `ipadddr' */
                (void) strlcpy(ipaddr->ipadm_aobjname, rval.ir_aobjname,
                    sizeof (ipaddr->ipadm_aobjname));
        }
        if (err == EEXIST)
                return (IPADM_ADDROBJ_EXISTS);
        return (ipadm_errno2status(err));
}

/*
 * Sets the logical interface number in the ipmgmtd's memory map for the
 * address object `ipaddr'. If another address object has the same
 * logical interface number, IPADM_ADDROBJ_EXISTS is returned.
 */
ipadm_status_t
i_ipadm_setlifnum_addrobj(ipadm_handle_t iph, ipadm_addrobj_t ipaddr)
{
        ipmgmt_aobjop_arg_t     larg;
        ipmgmt_retval_t         rval, *rvalp;
        int                     err;

        if (iph->iph_flags & IPH_IPMGMTD)
                return (IPADM_SUCCESS);

        bzero(&larg, sizeof (larg));
        larg.ia_cmd = IPMGMT_CMD_ADDROBJ_SETLIFNUM;
        (void) strlcpy(larg.ia_aobjname, ipaddr->ipadm_aobjname,
            sizeof (larg.ia_aobjname));
        larg.ia_lnum = ipaddr->ipadm_lifnum;
        (void) strlcpy(larg.ia_ifname, ipaddr->ipadm_ifname,
            sizeof (larg.ia_ifname));
        larg.ia_family = ipaddr->ipadm_af;

        rvalp = &rval;
        err = ipadm_door_call(iph, &larg, sizeof (larg), (void **)&rvalp,
            sizeof (rval), B_FALSE);
        if (err == EEXIST)
                return (IPADM_ADDROBJ_EXISTS);
        return (ipadm_errno2status(err));
}

/*
 * Creates the IPv4 or IPv6 address in the nvlist `nvl' on the interface
 * `ifname'. If a hostname is present, it is resolved before the address
 * is created.
 */
ipadm_status_t
i_ipadm_enable_static(ipadm_handle_t iph, const char *ifname, nvlist_t *nvl,
    sa_family_t af)
{
        char                    *prefixlenstr = NULL;
        char                    *upstr = NULL;
        char                    *sname = NULL, *dname = NULL;
        struct ipadm_addrobj_s  ipaddr;
        char                    *aobjname = NULL;
        nvlist_t                *nvaddr = NULL;
        nvpair_t                *nvp;
        char                    *cidraddr;
        char                    *name;
        ipadm_status_t          status;
        int                     err = 0;
        uint32_t                flags = IPADM_OPT_ACTIVE;

        /* retrieve the address information */
        for (nvp = nvlist_next_nvpair(nvl, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(nvl, nvp)) {
                name = nvpair_name(nvp);
                if (strcmp(name, IPADM_NVP_IPV4ADDR) == 0 ||
                    strcmp(name, IPADM_NVP_IPV6ADDR) == 0) {
                        err = nvpair_value_nvlist(nvp, &nvaddr);
                } else if (strcmp(name, IPADM_NVP_AOBJNAME) == 0) {
                        err = nvpair_value_string(nvp, &aobjname);
                } else if (strcmp(name, IPADM_NVP_PREFIXLEN) == 0) {
                        err = nvpair_value_string(nvp, &prefixlenstr);
                } else if (strcmp(name, "up") == 0) {
                        err = nvpair_value_string(nvp, &upstr);
                }
                if (err != 0)
                        return (ipadm_errno2status(err));
        }
        for (nvp = nvlist_next_nvpair(nvaddr, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(nvaddr, nvp)) {
                name = nvpair_name(nvp);
                if (strcmp(name, IPADM_NVP_IPADDRHNAME) == 0)
                        err = nvpair_value_string(nvp, &sname);
                else if (strcmp(name, IPADM_NVP_IPDADDRHNAME) == 0)
                        err = nvpair_value_string(nvp, &dname);
                if (err != 0)
                        return (ipadm_errno2status(err));
        }

        if (strcmp(upstr, "yes") == 0)
                flags |= IPADM_OPT_UP;

        /* build the address object from the above information */
        i_ipadm_init_addr(&ipaddr, ifname, aobjname, IPADM_ADDR_STATIC);
        if (prefixlenstr != NULL && atoi(prefixlenstr) > 0) {
                if (asprintf(&cidraddr, "%s/%s", sname, prefixlenstr) == -1)
                        return (IPADM_NO_MEMORY);
                status = ipadm_set_addr(&ipaddr, cidraddr, af);
                free(cidraddr);
        } else {
                status = ipadm_set_addr(&ipaddr, sname, af);
        }
        if (status != IPADM_SUCCESS)
                return (status);

        if (dname != NULL) {
                status = ipadm_set_dst_addr(&ipaddr, dname, af);
                if (status != IPADM_SUCCESS)
                        return (status);
        }
        return (i_ipadm_create_addr(iph, &ipaddr, flags));
}

/*
 * Creates a dhcp address on the interface `ifname' based on the
 * IPADM_ADDR_DHCP address object parameters from the nvlist `nvl'.
 */
ipadm_status_t
i_ipadm_enable_dhcp(ipadm_handle_t iph, const char *ifname, nvlist_t *nvl)
{
        int32_t                 wait = IPADM_DHCP_WAIT_DEFAULT;
        boolean_t               primary = B_FALSE;
        nvlist_t                *nvdhcp = NULL;
        nvpair_t                *nvp;
        char                    *name;
        struct ipadm_addrobj_s  ipaddr;
        char                    *aobjname = NULL, *reqhost = NULL;
        int                     err = 0;
        ipadm_status_t          ipadm_err = IPADM_SUCCESS;

        /* Extract the dhcp parameters */
        for (nvp = nvlist_next_nvpair(nvl, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(nvl, nvp)) {
                name = nvpair_name(nvp);
                if (strcmp(name, IPADM_NVP_DHCP) == 0)
                        err = nvpair_value_nvlist(nvp, &nvdhcp);
                else if (strcmp(name, IPADM_NVP_AOBJNAME) == 0)
                        err = nvpair_value_string(nvp, &aobjname);
                else if (strcmp(name, IPADM_NVP_REQHOST) == 0)
                        err = nvpair_value_string(nvp, &reqhost);
                if (err != 0)
                        return (ipadm_errno2status(err));
        }
        for (nvp = nvlist_next_nvpair(nvdhcp, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(nvdhcp, nvp)) {
                name = nvpair_name(nvp);
                if (strcmp(name, IPADM_NVP_WAIT) == 0)
                        err = nvpair_value_int32(nvp, &wait);
                else if (strcmp(name, IPADM_NVP_PRIMARY) == 0)
                        err = nvpair_value_boolean_value(nvp, &primary);
                if (err != 0)
                        return (ipadm_errno2status(err));
        }

        /* Build the address object */
        i_ipadm_init_addr(&ipaddr, ifname, aobjname, IPADM_ADDR_DHCP);
        ipaddr.ipadm_primary = primary;
        if (iph->iph_flags & IPH_INIT)
                ipaddr.ipadm_wait = 0;
        else
                ipaddr.ipadm_wait = wait;
        ipadm_err = ipadm_set_reqhost(&ipaddr, reqhost);
        if (ipadm_err != IPADM_SUCCESS)
                return (ipadm_err);
        ipaddr.ipadm_af = AF_INET;
        return (i_ipadm_create_dhcp(iph, &ipaddr, IPADM_OPT_ACTIVE));
}

/*
 * Creates auto-configured addresses on the interface `ifname' based on
 * the IPADM_ADDR_IPV6_ADDRCONF address object parameters from the nvlist `nvl'.
 */
ipadm_status_t
i_ipadm_enable_addrconf(ipadm_handle_t iph, const char *ifname, nvlist_t *nvl)
{
        struct ipadm_addrobj_s  ipaddr;
        char            *stateful = NULL, *stateless = NULL;
        uint_t          n;
        uint8_t         *addr6 = NULL;
        uint32_t        intfidlen = 0;
        char            *aobjname;
        nvlist_t        *nvaddr;
        nvpair_t        *nvp;
        char            *name;
        int             err = 0;

        /* Extract the parameters */
        for (nvp = nvlist_next_nvpair(nvl, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(nvl, nvp)) {
                name = nvpair_name(nvp);
                if (strcmp(name, IPADM_NVP_INTFID) == 0)
                        err = nvpair_value_nvlist(nvp, &nvaddr);
                else if (strcmp(name, IPADM_NVP_AOBJNAME) == 0)
                        err = nvpair_value_string(nvp, &aobjname);
                if (err != 0)
                        return (ipadm_errno2status(err));
        }
        for (nvp = nvlist_next_nvpair(nvaddr, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(nvaddr, nvp)) {
                name = nvpair_name(nvp);
                if (strcmp(name, IPADM_NVP_IPNUMADDR) == 0)
                        err = nvpair_value_uint8_array(nvp, &addr6, &n);
                if (strcmp(name, IPADM_NVP_PREFIXLEN) == 0)
                        err = nvpair_value_uint32(nvp, &intfidlen);
                else if (strcmp(name, IPADM_NVP_STATELESS) == 0)
                        err = nvpair_value_string(nvp, &stateless);
                else if (strcmp(name, IPADM_NVP_STATEFUL) == 0)
                        err = nvpair_value_string(nvp, &stateful);
                if (err != 0)
                        return (ipadm_errno2status(err));
        }
        /* Build the address object. */
        i_ipadm_init_addr(&ipaddr, ifname, aobjname, IPADM_ADDR_IPV6_ADDRCONF);
        if (intfidlen > 0) {
                ipaddr.ipadm_intfidlen = intfidlen;
                bcopy(addr6, &ipaddr.ipadm_intfid.sin6_addr.s6_addr, n);
        }
        ipaddr.ipadm_stateless = (strcmp(stateless, "yes") == 0);
        ipaddr.ipadm_stateful = (strcmp(stateful, "yes") == 0);
        return (i_ipadm_create_ipv6addrs(iph, &ipaddr, IPADM_OPT_ACTIVE));
}

/*
 * Allocates `ipadm_addrobj_t' and populates the relevant member fields based on
 * the provided `type'. `aobjname' represents the address object name, which
 * is of the form `<ifname>/<addressname>'.
 *
 * The caller has to minimally provide <ifname>. If <addressname> is not
 * provided, then a default one will be generated by the API.
 */
ipadm_status_t
ipadm_create_addrobj(ipadm_addr_type_t type, const char *aobjname,
    ipadm_addrobj_t *ipaddr)
{
        ipadm_addrobj_t newaddr;
        ipadm_status_t  status;
        char            *aname, *cp;
        char            ifname[IPADM_AOBJSIZ];
        ifspec_t        ifsp;

        if (ipaddr == NULL)
                return (IPADM_INVALID_ARG);
        *ipaddr = NULL;

        if (aobjname == NULL || aobjname[0] == '\0')
                return (IPADM_INVALID_ARG);

        if (strlcpy(ifname, aobjname, IPADM_AOBJSIZ) >= IPADM_AOBJSIZ)
                return (IPADM_INVALID_ARG);

        if ((aname = strchr(ifname, '/')) != NULL)
                *aname++ = '\0';

        /* Check if the interface name is valid. */
        if (!ifparse_ifspec(ifname, &ifsp))
                return (IPADM_INVALID_ARG);

        /* Check if the given addrobj name is valid. */
        if (aname != NULL && !i_ipadm_is_user_aobjname_valid(aname))
                return (IPADM_INVALID_ARG);

        if ((newaddr = calloc(1, sizeof (struct ipadm_addrobj_s))) == NULL)
                return (IPADM_NO_MEMORY);

        /*
         * If the ifname has logical interface number, extract it and assign
         * it to `ipadm_lifnum'. Only applications with IPH_LEGACY set will do
         * this today. We will check for the validity later in
         * i_ipadm_validate_create_addr().
         */
        if (ifsp.ifsp_lunvalid) {
                newaddr->ipadm_lifnum = ifsp.ifsp_lun;
                cp = strchr(ifname, IPADM_LOGICAL_SEP);
                *cp = '\0';
        }
        (void) strlcpy(newaddr->ipadm_ifname, ifname,
            sizeof (newaddr->ipadm_ifname));

        if (aname != NULL) {
                (void) snprintf(newaddr->ipadm_aobjname,
                    sizeof (newaddr->ipadm_aobjname), "%s/%s", ifname, aname);
        }

        switch (type) {
        case IPADM_ADDR_IPV6_ADDRCONF:
                newaddr->ipadm_intfidlen = 0;
                newaddr->ipadm_stateful = B_TRUE;
                newaddr->ipadm_stateless = B_TRUE;
                newaddr->ipadm_af = AF_INET6;
                break;

        case IPADM_ADDR_DHCP:
                newaddr->ipadm_primary = B_FALSE;
                newaddr->ipadm_wait = IPADM_DHCP_WAIT_DEFAULT;
                newaddr->ipadm_af = AF_INET;
                break;

        case IPADM_ADDR_STATIC:
                newaddr->ipadm_af = AF_UNSPEC;
                newaddr->ipadm_static_prefixlen = 0;
                break;

        default:
                status = IPADM_INVALID_ARG;
                goto fail;
        }
        newaddr->ipadm_atype = type;
        *ipaddr = newaddr;
        return (IPADM_SUCCESS);
fail:
        free(newaddr);
        return (status);
}

/*
 * Returns `aobjname' from the address object in `ipaddr'.
 */
ipadm_status_t
ipadm_get_aobjname(const ipadm_addrobj_t ipaddr, char *aobjname, size_t len)
{
        if (ipaddr == NULL || aobjname == NULL)
                return (IPADM_INVALID_ARG);
        if (strlcpy(aobjname, ipaddr->ipadm_aobjname, len) >= len)
                return (IPADM_INVALID_ARG);

        return (IPADM_SUCCESS);
}

/*
 * Frees the address object in `ipaddr'.
 */
void
ipadm_destroy_addrobj(ipadm_addrobj_t ipaddr)
{
        free(ipaddr);
}

/*
 * Retrieves the logical interface name from `ipaddr' and stores the
 * string in `lifname'.
 */
void
i_ipadm_addrobj2lifname(ipadm_addrobj_t ipaddr, char *lifname, int lifnamesize)
{
        if (ipaddr->ipadm_lifnum != 0) {
                (void) snprintf(lifname, lifnamesize, "%s:%d",
                    ipaddr->ipadm_ifname, ipaddr->ipadm_lifnum);
        } else {
                (void) snprintf(lifname, lifnamesize, "%s",
                    ipaddr->ipadm_ifname);
        }
}

/*
 * Checks if a non-zero static address is present on the 0th logical interface
 * of the given IPv4 or IPv6 physical interface. For an IPv4 interface, it
 * also checks if the interface is under DHCP control. If the condition is true,
 * the output argument `exists' will be set to B_TRUE. Otherwise, `exists'
 * is set to B_FALSE.
 *
 * Note that *exists will not be initialized if an error is encountered.
 */
static ipadm_status_t
i_ipadm_addr_exists_on_if(ipadm_handle_t iph, const char *ifname,
    sa_family_t af, boolean_t *exists)
{
        struct lifreq   lifr;
        int             sock;

        /* For IPH_LEGACY, a new logical interface will never be added. */
        if (iph->iph_flags & IPH_LEGACY) {
                *exists = B_FALSE;
                return (IPADM_SUCCESS);
        }
        bzero(&lifr, sizeof (lifr));
        (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
        if (af == AF_INET) {
                sock = iph->iph_sock;
                if (ioctl(sock, SIOCGLIFFLAGS, (caddr_t)&lifr) < 0)
                        return (ipadm_errno2status(errno));
                if (lifr.lifr_flags & IFF_DHCPRUNNING) {
                        *exists = B_TRUE;
                        return (IPADM_SUCCESS);
                }
        } else {
                sock = iph->iph_sock6;
        }
        if (ioctl(sock, SIOCGLIFADDR, (caddr_t)&lifr) < 0)
                return (ipadm_errno2status(errno));
        *exists = !sockaddrunspec((struct sockaddr *)&lifr.lifr_addr);

        return (IPADM_SUCCESS);
}

/*
 * Adds a new logical interface in the kernel for interface
 * `addr->ipadm_ifname', if there is a non-zero address on the 0th
 * logical interface or if the 0th logical interface is under DHCP
 * control. On success, it sets the lifnum in the address object `addr'.
 */
ipadm_status_t
i_ipadm_do_addif(ipadm_handle_t iph, ipadm_addrobj_t addr)
{
        ipadm_status_t  status;
        boolean_t       addif;
        struct lifreq   lifr;
        int             sock;

        addr->ipadm_lifnum = 0;
        status = i_ipadm_addr_exists_on_if(iph, addr->ipadm_ifname,
            addr->ipadm_af, &addif);
        if (status != IPADM_SUCCESS)
                return (status);
        if (addif) {
                /*
                 * If there is an address on 0th logical interface,
                 * add a new logical interface.
                 */
                bzero(&lifr, sizeof (lifr));
                (void) strlcpy(lifr.lifr_name, addr->ipadm_ifname,
                    sizeof (lifr.lifr_name));
                sock = (addr->ipadm_af == AF_INET ? iph->iph_sock :
                    iph->iph_sock6);
                if (ioctl(sock, SIOCLIFADDIF, (caddr_t)&lifr) < 0)
                        return (ipadm_errno2status(errno));
                addr->ipadm_lifnum = i_ipadm_get_lnum(lifr.lifr_name);
        }
        return (IPADM_SUCCESS);
}

/*
 * Reads all the address lines from the persistent DB into the nvlist `onvl',
 * when both `ifname' and `aobjname' are NULL. If an `ifname' is provided,
 * it returns all the addresses for the given interface `ifname'.
 * If an `aobjname' is specified, then the address line corresponding to
 * that name will be returned.
 */
static ipadm_status_t
i_ipadm_get_db_addr(ipadm_handle_t iph, const char *ifname,
    const char *aobjname, nvlist_t **onvl)
{
        ipmgmt_getaddr_arg_t    garg;
        ipmgmt_get_rval_t       *rvalp;
        int                     err;
        size_t                  nvlsize;
        char                    *nvlbuf;

        /* Populate the door_call argument structure */
        bzero(&garg, sizeof (garg));
        garg.ia_cmd = IPMGMT_CMD_GETADDR;
        if (aobjname != NULL)
                (void) strlcpy(garg.ia_aobjname, aobjname,
                    sizeof (garg.ia_aobjname));
        if (ifname != NULL)
                (void) strlcpy(garg.ia_ifname, ifname, sizeof (garg.ia_ifname));

        rvalp = malloc(sizeof (ipmgmt_get_rval_t));
        err = ipadm_door_call(iph, &garg, sizeof (garg), (void **)&rvalp,
            sizeof (*rvalp), B_TRUE);
        if (err == 0) {
                nvlsize = rvalp->ir_nvlsize;
                nvlbuf = (char *)rvalp + sizeof (ipmgmt_get_rval_t);
                err = nvlist_unpack(nvlbuf, nvlsize, onvl, NV_ENCODE_NATIVE);
        }
        free(rvalp);
        return (ipadm_errno2status(err));
}

/*
 * Adds the IP address contained in the 'ipaddr' argument to the physical
 * interface represented by 'ifname' after doing the required validation.
 * If the interface does not exist, it is created before the address is
 * added.
 *
 * If IPH_LEGACY is set in iph_flags, flags has to be IPADM_OPT_ACTIVE
 * and a default addrobj name will be generated. Input `addr->ipadm_aobjname',
 * if provided, will be ignored and replaced with the newly generated name.
 * The interface name provided has to be a logical interface name that
 * already exists. No new logical interface will be added in this function.
 *
 * If IPADM_OPT_V46 is passed in the flags, then both IPv4 and IPv6 interfaces
 * are plumbed (if they haven't been already).  Otherwise, just the interface
 * specified in `addr' is plumbed.
 */
ipadm_status_t
ipadm_create_addr(ipadm_handle_t iph, ipadm_addrobj_t addr, uint32_t flags)
{
        ipadm_status_t          status;
        sa_family_t             af;
        sa_family_t             daf;
        sa_family_t             other_af;
        boolean_t               created_af = B_FALSE;
        boolean_t               created_other_af = B_FALSE;
        ipadm_addr_type_t       type;
        char                    *ifname = addr->ipadm_ifname;
        boolean_t               legacy = (iph->iph_flags & IPH_LEGACY);
        boolean_t               aobjfound;
        boolean_t               is_6to4;
        struct lifreq           lifr;
        uint64_t                ifflags;
        boolean_t               is_boot = (iph->iph_flags & IPH_IPMGMTD);

        /* check for solaris.network.interface.config authorization */
        if (!ipadm_check_auth())
                return (IPADM_EAUTH);

        /* Validate the addrobj. This also fills in addr->ipadm_ifname. */
        status = i_ipadm_validate_create_addr(iph, addr, flags);
        if (status != IPADM_SUCCESS)
                return (status);

        /*
         * For Legacy case, check if an addrobj already exists for the
         * given logical interface name. If one does not exist,
         * a default name will be generated and added to the daemon's
         * aobjmap.
         */
        if (legacy) {
                struct ipadm_addrobj_s  ipaddr;

                ipaddr = *addr;
                status = i_ipadm_get_lif2addrobj(iph, &ipaddr);
                if (status == IPADM_SUCCESS) {
                        aobjfound = B_TRUE;
                        /*
                         * With IPH_LEGACY, modifying an address that is not
                         * a static address will return with an error.
                         */
                        if (ipaddr.ipadm_atype != IPADM_ADDR_STATIC)
                                return (IPADM_NOTSUP);
                        /*
                         * we found the addrobj in daemon, copy over the
                         * aobjname to `addr'.
                         */
                        (void) strlcpy(addr->ipadm_aobjname,
                            ipaddr.ipadm_aobjname, IPADM_AOBJSIZ);
                } else if (status == IPADM_NOTFOUND) {
                        aobjfound = B_FALSE;
                } else {
                        return (status);
                }
        }

        af = addr->ipadm_af;
        /*
         * Create a placeholder for this address object in the daemon.
         * Skip this step if we are booting a zone (and therefore being called
         * from ipmgmtd itself), and, for IPH_LEGACY case if the
         * addrobj already exists.
         *
         * Note that the placeholder is not needed in the NGZ boot case,
         * when zoneadmd has itself applied the "allowed-ips" property to clamp
         * down any interface configuration, so the namespace for the interface
         * is fully controlled by the GZ.
         */
        if (!is_boot && (!legacy || !aobjfound)) {
                status = i_ipadm_lookupadd_addrobj(iph, addr);
                if (status != IPADM_SUCCESS)
                        return (status);
        }

        is_6to4 = i_ipadm_is_6to4(iph, ifname);
        /* Plumb the IP interfaces if necessary */
        status = i_ipadm_create_if(iph, ifname, af, flags);
        if (status != IPADM_SUCCESS && status != IPADM_IF_EXISTS) {
                (void) i_ipadm_delete_addrobj(iph, addr, IPADM_OPT_ACTIVE);
                return (status);
        }
        if (status == IPADM_SUCCESS)
                created_af = B_TRUE;
        if (!is_6to4 && !legacy && (flags & IPADM_OPT_V46)) {
                other_af = (af == AF_INET ? AF_INET6 : AF_INET);
                status = i_ipadm_create_if(iph, ifname, other_af, flags);
                if (status != IPADM_SUCCESS && status != IPADM_IF_EXISTS) {
                        (void) i_ipadm_delete_if(iph, ifname, af, flags);
                        return (status);
                }
                if (status == IPADM_SUCCESS)
                        created_other_af = B_TRUE;
        }

        /*
         * Some input validation based on the interface flags:
         * 1. in non-global zones, make sure that we are not persistently
         *    creating addresses on interfaces that are acquiring
         *    address from the global zone.
         * 2. Validate static addresses for IFF_POINTOPOINT interfaces.
         */
        if (addr->ipadm_atype == IPADM_ADDR_STATIC) {
                status = i_ipadm_get_flags(iph, ifname, af, &ifflags);
                if (status != IPADM_SUCCESS)
                        goto fail;

                if (iph->iph_zoneid != GLOBAL_ZONEID &&
                    (ifflags & IFF_L3PROTECT) && (flags & IPADM_OPT_PERSIST)) {
                        status = IPADM_GZ_PERM;
                        goto fail;
                }
                daf = addr->ipadm_static_dst_addr.ss_family;
                if (ifflags & IFF_POINTOPOINT) {
                        if (is_6to4) {
                                if (af != AF_INET6 || daf != AF_UNSPEC) {
                                        status = IPADM_INVALID_ARG;
                                        goto fail;
                                }
                        } else {
                                if (daf != af) {
                                        status = IPADM_INVALID_ARG;
                                        goto fail;
                                }
                                /* Check for a valid dst address. */
                                if (!legacy && sockaddrunspec(
                                    (struct sockaddr *)
                                    &addr->ipadm_static_dst_addr)) {
                                        status = IPADM_BAD_ADDR;
                                        goto fail;
                                }
                        }
                } else {
                        /*
                         * Disallow setting of dstaddr when the link is not
                         * a point-to-point link.
                         */
                        if (daf != AF_UNSPEC)
                                return (IPADM_INVALID_ARG);
                }
        }

        /*
         * For 6to4 interfaces, kernel configures a default link-local
         * address. We need to replace it, if the caller has provided
         * an address that is different from the default link-local.
         */
        if (status == IPADM_SUCCESS && is_6to4) {
                bzero(&lifr, sizeof (lifr));
                (void) strlcpy(lifr.lifr_name, addr->ipadm_ifname,
                    sizeof (lifr.lifr_name));
                if (ioctl(iph->iph_sock6, SIOCGLIFADDR, &lifr) < 0) {
                        status = ipadm_errno2status(errno);
                        goto fail;
                }
                if (sockaddrcmp(&lifr.lifr_addr, &addr->ipadm_static_addr))
                        return (IPADM_SUCCESS);
        }

        /* Create the address. */
        type = addr->ipadm_atype;
        switch (type) {
        case IPADM_ADDR_STATIC:
                status = i_ipadm_create_addr(iph, addr, flags);
                break;
        case IPADM_ADDR_DHCP:
                status = i_ipadm_create_dhcp(iph, addr, flags);
                break;
        case IPADM_ADDR_IPV6_ADDRCONF:
                status = i_ipadm_create_ipv6addrs(iph, addr, flags);
                break;
        default:
                status = IPADM_INVALID_ARG;
                break;
        }

        /*
         * If address was not created successfully, unplumb the interface
         * if it was plumbed implicitly in this function and remove the
         * addrobj created by the ipmgmtd daemon as a placeholder.
         * If IPH_LEGACY is set, then remove the addrobj only if it was
         * created in this function.
         */
fail:
        if (status != IPADM_DHCP_IPC_TIMEOUT &&
            status != IPADM_SUCCESS) {
                if (!legacy) {
                        if (created_af || created_other_af) {
                                if (created_af) {
                                        (void) i_ipadm_delete_if(iph, ifname,
                                            af, flags);
                                }
                                if (created_other_af) {
                                        (void) i_ipadm_delete_if(iph, ifname,
                                            other_af, flags);
                                }
                        } else {
                                (void) i_ipadm_delete_addrobj(iph, addr, flags);
                        }
                } else if (!aobjfound) {
                        (void) i_ipadm_delete_addrobj(iph, addr, flags);
                }
        }

        return (status);
}

/*
 * Creates the static address in `ipaddr' in kernel. After successfully
 * creating it, it updates the ipmgmtd daemon's aobjmap with the logical
 * interface information.
 */
static ipadm_status_t
i_ipadm_create_addr(ipadm_handle_t iph, ipadm_addrobj_t ipaddr, uint32_t flags)
{
        struct lifreq                   lifr;
        ipadm_status_t                  status = IPADM_SUCCESS;
        int                             sock;
        struct sockaddr_storage         m, *mask = &m;
        const struct sockaddr_storage   *addr = &ipaddr->ipadm_static_addr;
        const struct sockaddr_storage   *daddr = &ipaddr->ipadm_static_dst_addr;
        sa_family_t                     af;
        boolean_t                       legacy = (iph->iph_flags & IPH_LEGACY);
        struct ipadm_addrobj_s          legacy_addr;
        boolean_t                       default_prefixlen = B_FALSE;
        boolean_t                       is_boot;

        is_boot = ((iph->iph_flags & IPH_IPMGMTD) != 0);
        af = ipaddr->ipadm_af;
        sock = (af == AF_INET ? iph->iph_sock : iph->iph_sock6);

        /* If prefixlen was not provided, get default prefixlen */
        if (ipaddr->ipadm_static_prefixlen == 0) {
                /* prefixlen was not provided, get default prefixlen */
                status = i_ipadm_get_default_prefixlen(
                    &ipaddr->ipadm_static_addr,
                    &ipaddr->ipadm_static_prefixlen);
                if (status != IPADM_SUCCESS)
                        return (status);
                default_prefixlen = B_TRUE;
        }
        (void) plen2mask(ipaddr->ipadm_static_prefixlen, af,
            (struct sockaddr *)mask);

        /*
         * Create a new logical interface if needed; otherwise, just
         * use the 0th logical interface.
         */
retry:
        if (!(iph->iph_flags & IPH_LEGACY)) {
                status = i_ipadm_do_addif(iph, ipaddr);
                if (status != IPADM_SUCCESS)
                        return (status);
                /*
                 * We don't have to set the lifnum for IPH_INIT case, because
                 * there is no placeholder created for the address object in
                 * this case. For IPH_LEGACY, we don't do this because the
                 * lifnum is given by the caller and it will be set in the
                 * end while we call the i_ipadm_addr_persist().
                 */
                if (!(iph->iph_flags & IPH_INIT)) {
                        status = i_ipadm_setlifnum_addrobj(iph, ipaddr);
                        if (status == IPADM_ADDROBJ_EXISTS)
                                goto retry;
                        if (status != IPADM_SUCCESS)
                                return (status);
                }
        }
        i_ipadm_addrobj2lifname(ipaddr, lifr.lifr_name,
            sizeof (lifr.lifr_name));
        lifr.lifr_addr = *mask;
        if (ioctl(sock, SIOCSLIFNETMASK, (caddr_t)&lifr) < 0) {
                status = ipadm_errno2status(errno);
                goto ret;
        }
        lifr.lifr_addr = *addr;
        if (ioctl(sock, SIOCSLIFADDR, (caddr_t)&lifr) < 0) {
                status = ipadm_errno2status(errno);
                goto ret;
        }
        /* Set the destination address, if one is given. */
        if (daddr->ss_family != AF_UNSPEC) {
                lifr.lifr_addr = *daddr;
                if (ioctl(sock, SIOCSLIFDSTADDR, (caddr_t)&lifr) < 0) {
                        status = ipadm_errno2status(errno);
                        goto ret;
                }
        }

        if (flags & IPADM_OPT_UP) {
                status = i_ipadm_set_flags(iph, lifr.lifr_name, af, IFF_UP, 0);

                /*
                 * IPADM_DAD_FOUND is a soft-error for create-addr.
                 * No need to tear down the address.
                 */
                if (status == IPADM_DAD_FOUND)
                        status = IPADM_SUCCESS;
        }

        if (status == IPADM_SUCCESS && !is_boot) {
                /*
                 * For IPH_LEGACY, we might be modifying the address on
                 * an address object that already exists e.g. by doing
                 * "ifconfig bge0:1 <addr>; ifconfig bge0:1 <newaddr>"
                 * So, we need to store the object only if it does not
                 * already exist in ipmgmtd.
                 */
                if (legacy) {
                        bzero(&legacy_addr, sizeof (legacy_addr));
                        (void) strlcpy(legacy_addr.ipadm_aobjname,
                            ipaddr->ipadm_aobjname,
                            sizeof (legacy_addr.ipadm_aobjname));
                        status = i_ipadm_get_addrobj(iph, &legacy_addr);
                        if (status == IPADM_SUCCESS &&
                            legacy_addr.ipadm_lifnum >= 0) {
                                return (status);
                        }
                }
                status = i_ipadm_addr_persist(iph, ipaddr, default_prefixlen,
                    flags, NULL);
        }
ret:
        if (status != IPADM_SUCCESS && !legacy)
                (void) i_ipadm_delete_addr(iph, ipaddr);
        return (status);
}

/*
 * Removes the address object identified by `aobjname' from both active and
 * persistent configuration. The address object will be removed from only
 * active configuration if IPH_LEGACY is set in `iph->iph_flags'.
 *
 * If the address type is IPADM_ADDR_STATIC or IPADM_ADDR_DHCP, the address
 * in the address object will be removed from the physical interface.
 * If the address type is IPADM_ADDR_DHCP, the flag IPADM_OPT_RELEASE specifies
 * whether the lease should be released. If IPADM_OPT_RELEASE is not
 * specified, the lease will be dropped. This option is not supported
 * for other address types.
 *
 * If the address type is IPADM_ADDR_IPV6_ADDRCONF, the link-local address and
 * all the autoconfigured addresses will be removed.
 * Finally, the address object is also removed from ipmgmtd's aobjmap and from
 * the persistent DB.
 */
ipadm_status_t
ipadm_delete_addr(ipadm_handle_t iph, const char *aobjname, uint32_t flags)
{
        ipadm_status_t          status;
        struct ipadm_addrobj_s  ipaddr;
        boolean_t               release = ((flags & IPADM_OPT_RELEASE) != 0);

        /* check for solaris.network.interface.config authorization */
        if (!ipadm_check_auth())
                return (IPADM_EAUTH);

        /* validate input */
        if (flags == 0 || ((flags & IPADM_OPT_PERSIST) &&
            !(flags & IPADM_OPT_ACTIVE)) ||
            (flags & ~(IPADM_COMMON_OPT_MASK|IPADM_OPT_RELEASE))) {
                return (IPADM_INVALID_ARG);
        }
        bzero(&ipaddr, sizeof (ipaddr));
        if (aobjname == NULL || strlcpy(ipaddr.ipadm_aobjname, aobjname,
            IPADM_AOBJSIZ) >= IPADM_AOBJSIZ) {
                return (IPADM_INVALID_ARG);
        }

        /* Retrieve the address object information from ipmgmtd. */
        status = i_ipadm_get_addrobj(iph, &ipaddr);
        if (status != IPADM_SUCCESS)
                return (status);

        if (release && ipaddr.ipadm_atype != IPADM_ADDR_DHCP)
                return (IPADM_NOTSUP);
        /*
         * If requested to delete just from active config but the address
         * is not in active config, return error.
         */
        if (!(ipaddr.ipadm_flags & IPMGMT_ACTIVE) &&
            (flags & IPADM_OPT_ACTIVE) && !(flags & IPADM_OPT_PERSIST)) {
                return (IPADM_NOTFOUND);
        }

        /*
         * If address is present in active config, remove it from
         * kernel.
         */
        if (ipaddr.ipadm_flags & IPMGMT_ACTIVE) {
                switch (ipaddr.ipadm_atype) {
                case IPADM_ADDR_STATIC:
                        status = i_ipadm_delete_addr(iph, &ipaddr);
                        break;
                case IPADM_ADDR_DHCP:
                        status = i_ipadm_delete_dhcp(iph, &ipaddr, release);
                        break;
                case IPADM_ADDR_IPV6_ADDRCONF:
                        status = i_ipadm_delete_ipv6addrs(iph, &ipaddr);
                        break;
                default:
                        /*
                         * This is the case of address object name residing in
                         * daemon's aobjmap (added by ADDROBJ_LOOKUPADD). Fall
                         * through and delete that address object.
                         */
                        break;
                }

                /*
                 * If the address was previously deleted from the active
                 * config, we will get a IPADM_ENXIO from kernel.
                 * We will still proceed and purge the address information
                 * in the DB.
                 */
                if (status == IPADM_ENXIO)
                        status = IPADM_SUCCESS;
                else if (status != IPADM_SUCCESS)
                        return (status);
        }

        if (!(ipaddr.ipadm_flags & IPMGMT_PERSIST) &&
            (flags & IPADM_OPT_PERSIST)) {
                flags &= ~IPADM_OPT_PERSIST;
        }
        status = i_ipadm_delete_addrobj(iph, &ipaddr, flags);
        if (status == IPADM_NOTFOUND)
                return (status);
        return (IPADM_SUCCESS);
}

/*
 * Starts the dhcpagent and sends it the message DHCP_START to start
 * configuring a dhcp address on the given interface in `addr'.
 * After making the dhcpagent request, it also updates the
 * address object information in ipmgmtd's aobjmap and creates an
 * entry in persistent DB if IPADM_OPT_PERSIST is set in `flags'.
 */
static ipadm_status_t
i_ipadm_create_dhcp(ipadm_handle_t iph, ipadm_addrobj_t addr, uint32_t flags)
{
        ipadm_status_t  status;
        ipadm_status_t  dh_status;

        if (dhcp_start_agent(DHCP_IPC_MAX_WAIT) == -1)
                return (IPADM_DHCP_START_ERROR);
        /*
         * Create a new logical interface if needed; otherwise, just
         * use the 0th logical interface.
         */
retry:
        status = i_ipadm_do_addif(iph, addr);
        if (status != IPADM_SUCCESS)
                return (status);
        /*
         * We don't have to set the lifnum for IPH_INIT case, because
         * there is no placeholder created for the address object in this
         * case.
         */
        if (!(iph->iph_flags & IPH_INIT)) {
                status = i_ipadm_setlifnum_addrobj(iph, addr);
                if (status == IPADM_ADDROBJ_EXISTS)
                        goto retry;
                if (status != IPADM_SUCCESS)
                        return (status);
        }
        /* Send DHCP_START to the dhcpagent. */
        status = i_ipadm_op_dhcp(addr, DHCP_START, NULL);
        /*
         * We do not undo the create-addr operation for IPADM_DHCP_IPC_TIMEOUT
         * since it is only a soft error to indicate the caller that the lease
         * might be required after the function returns.
         */
        if (status != IPADM_SUCCESS && status != IPADM_DHCP_IPC_TIMEOUT)
                goto fail;
        dh_status = status;

        /* Persist the address object information in ipmgmtd. */
        status = i_ipadm_addr_persist(iph, addr, B_FALSE, flags, NULL);
        if (status != IPADM_SUCCESS)
                goto fail;

        return (dh_status);
fail:
        /* In case of error, delete the dhcp address */
        (void) i_ipadm_delete_dhcp(iph, addr, B_TRUE);
        return (status);
}

/*
 * Releases/drops the dhcp lease on the logical interface in the address
 * object `addr'. If `release' is set to B_FALSE, the lease will be dropped.
 */
static ipadm_status_t
i_ipadm_delete_dhcp(ipadm_handle_t iph, ipadm_addrobj_t addr, boolean_t release)
{
        ipadm_status_t  status;
        int             dherr;

        /* Send DHCP_RELEASE or DHCP_DROP to the dhcpagent */
        if (release) {
                status = i_ipadm_op_dhcp(addr, DHCP_RELEASE, &dherr);
                /*
                 * If no lease was obtained on the object, we should
                 * drop the dhcp control on the interface.
                 */
                if (status != IPADM_SUCCESS && dherr == DHCP_IPC_E_OUTSTATE)
                        status = i_ipadm_op_dhcp(addr, DHCP_DROP, NULL);
        } else {
                status = i_ipadm_op_dhcp(addr, DHCP_DROP, NULL);
        }
        if (status != IPADM_SUCCESS)
                return (status);

        /* Delete the logical interface */
        if (addr->ipadm_lifnum != 0) {
                struct lifreq lifr;

                bzero(&lifr, sizeof (lifr));
                i_ipadm_addrobj2lifname(addr, lifr.lifr_name,
                    sizeof (lifr.lifr_name));
                if (ioctl(iph->iph_sock, SIOCLIFREMOVEIF, (caddr_t)&lifr) < 0)
                        return (ipadm_errno2status(errno));
        }

        return (IPADM_SUCCESS);
}

/*
 * Communicates with the dhcpagent to send a dhcp message of type `type'.
 * It returns the dhcp error in `dhcperror' if a non-null pointer is provided
 * in `dhcperror'.
 */
static ipadm_status_t
i_ipadm_op_dhcp(ipadm_addrobj_t addr, dhcp_ipc_type_t type, int *dhcperror)
{
        dhcp_ipc_request_t      *request;
        dhcp_ipc_reply_t        *reply  = NULL;
        dhcp_symbol_t           *entry = NULL;
        dhcp_data_type_t        dtype = DHCP_TYPE_NONE;
        void                    *d4o = NULL;
        uint16_t                d4olen = 0;
        char                    ifname[LIFNAMSIZ];
        int                     error;
        int                     dhcp_timeout;

        /* Construct a message to the dhcpagent. */
        bzero(&ifname, sizeof (ifname));
        i_ipadm_addrobj2lifname(addr, ifname, sizeof (ifname));
        if (addr->ipadm_primary)
                type |= DHCP_PRIMARY;

        /* Set up a CD_HOSTNAME option, if applicable, to send through IPC */
        switch (DHCP_IPC_CMD(type)) {
        case DHCP_START:
        case DHCP_EXTEND:
                if (addr->ipadm_af == AF_INET && addr->ipadm_reqhost != NULL &&
                    *addr->ipadm_reqhost != '\0') {
                        entry = inittab_getbycode(ITAB_CAT_STANDARD,
                            ITAB_CONS_INFO, CD_HOSTNAME);
                        if (entry == NULL) {
                                return (IPADM_FAILURE);
                        } else {
                                d4o = inittab_encode(entry, addr->ipadm_reqhost,
                                    &d4olen, B_FALSE);
                                free(entry);
                                entry = NULL;
                                if (d4o == NULL)
                                        return (IPADM_FAILURE);
                                dtype = DHCP_TYPE_OPTION;
                        }
                }
                break;
        default:
                break;
        }

        request = dhcp_ipc_alloc_request(type, ifname, d4o, d4olen, dtype);
        if (request == NULL) {
                free(d4o);
                return (IPADM_NO_MEMORY);
        }

        if (addr->ipadm_wait == IPADM_DHCP_WAIT_FOREVER)
                dhcp_timeout = DHCP_IPC_WAIT_FOREVER;
        else if (addr->ipadm_wait == IPADM_DHCP_WAIT_DEFAULT)
                dhcp_timeout = DHCP_IPC_WAIT_DEFAULT;
        else
                dhcp_timeout = addr->ipadm_wait;
        /* Send the message to dhcpagent. */
        error = dhcp_ipc_make_request(request, &reply, dhcp_timeout);
        free(request);
        free(d4o);
        if (error == 0) {
                error = reply->return_code;
                free(reply);
        }
        if (error != 0) {
                if (dhcperror != NULL)
                        *dhcperror = error;
                if (error != DHCP_IPC_E_TIMEOUT)
                        return (IPADM_DHCP_IPC_ERROR);
                else if (dhcp_timeout != 0)
                        return (IPADM_DHCP_IPC_TIMEOUT);
        }

        return (IPADM_SUCCESS);
}

/*
 * Communicates with the dhcpagent to send a dhcp message of type
 * DHCP_STATUS, and copy on success into the `status' instance owned by the
 * caller. It returns any dhcp error in `dhcperror' if a non-null pointer
 * is provided.
 */
static ipadm_status_t
i_ipadm_dhcp_status(ipadm_addrobj_t addr, dhcp_status_t *status,
    int *dhcperror)
{
        dhcp_ipc_type_t         type = DHCP_STATUS;
        dhcp_ipc_request_t      *request;
        dhcp_ipc_reply_t        *reply;
        dhcp_status_t           *private_status;
        size_t                  reply_size;
        int                     error;

        if (addr->ipadm_af == AF_INET6)
                type |= DHCP_V6;

        request = dhcp_ipc_alloc_request(type, addr->ipadm_ifname, NULL, 0,
            DHCP_TYPE_NONE);
        if (request == NULL)
                return (IPADM_NO_MEMORY);

        error = dhcp_ipc_make_request(request, &reply, DHCP_IPC_WAIT_DEFAULT);
        free(request);
        if (error != 0) {
                if (dhcperror != NULL)
                        *dhcperror = error;
                return (error != DHCP_IPC_E_TIMEOUT ? IPADM_DHCP_IPC_ERROR
                    : IPADM_DHCP_IPC_TIMEOUT);
        }

        error = reply->return_code;
        if (error == DHCP_IPC_E_UNKIF) {
                free(reply);
                bzero(status, sizeof (dhcp_status_t));
                return (IPADM_NOTFOUND);
        }

        private_status = dhcp_ipc_get_data(reply, &reply_size, NULL);
        if (reply_size < DHCP_STATUS_VER1_SIZE) {
                free(reply);
                return (IPADM_DHCP_IPC_ERROR);
        }

        /*
         * Copy the status out of the memory allocated by this function into
         * memory owned by the caller.
         */
        *status = *private_status;
        free(reply);
        return (IPADM_SUCCESS);
}

/*
 * Returns the IP addresses of the specified interface in both the
 * active and the persistent configuration. If no
 * interface is specified, it returns all non-zero IP addresses
 * configured on all interfaces in active and persistent
 * configurations.
 * `addrinfo' will contain addresses that are
 * (1) in both active and persistent configuration (created persistently)
 * (2) only in active configuration (created temporarily)
 * (3) only in persistent configuration (disabled addresses)
 *
 * Address list that is returned by this function must be freed
 * using the ipadm_freeaddr_info() function.
 */
ipadm_status_t
ipadm_addr_info(ipadm_handle_t iph, const char *ifname,
    ipadm_addr_info_t **addrinfo, uint32_t flags, int64_t lifc_flags)
{
        ifspec_t        ifsp;

        if (addrinfo == NULL || iph == NULL)
                return (IPADM_INVALID_ARG);
        if (ifname != NULL &&
            (!ifparse_ifspec(ifname, &ifsp) || ifsp.ifsp_lunvalid)) {
                return (IPADM_INVALID_ARG);
        }
        return (i_ipadm_get_all_addr_info(iph, ifname, addrinfo,
            flags, lifc_flags));
}

/*
 * Frees the structure allocated by ipadm_addr_info().
 */
void
ipadm_free_addr_info(ipadm_addr_info_t *ainfo)
{
        freeifaddrs((struct ifaddrs *)ainfo);
}

/*
 * Makes a door call to ipmgmtd to update its `aobjmap' with the address
 * object in `ipaddr'. This door call also can update the persistent DB to
 * remember address object to be recreated on next reboot or on an
 * ipadm_enable_addr()/ipadm_enable_if() call.
 */
ipadm_status_t
i_ipadm_addr_persist(ipadm_handle_t iph, const ipadm_addrobj_t ipaddr,
    boolean_t default_prefixlen, uint32_t flags, const char *propname)
{
        char                    *aname = ipaddr->ipadm_aobjname;
        nvlist_t                *nvl;
        int                     err = 0;
        ipadm_status_t          status;
        uint_t                  pflags = 0;

        /*
         * Construct the nvl to send to the door.
         */
        if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
                return (IPADM_NO_MEMORY);
        if ((err = nvlist_add_string(nvl, IPADM_NVP_IFNAME,
            ipaddr->ipadm_ifname)) != 0 ||
            (err = nvlist_add_string(nvl, IPADM_NVP_AOBJNAME, aname)) != 0 ||
            (err = nvlist_add_int32(nvl, IPADM_NVP_LIFNUM,
            ipaddr->ipadm_lifnum)) != 0) {
                status = ipadm_errno2status(err);
                goto ret;
        }
        switch (ipaddr->ipadm_atype) {
        case IPADM_ADDR_STATIC:
                status = i_ipadm_add_ipaddr2nvl(nvl, ipaddr);
                if (status != IPADM_SUCCESS)
                        goto ret;
                if (flags & IPADM_OPT_UP)
                        err = nvlist_add_string(nvl, "up", "yes");
                else
                        err = nvlist_add_string(nvl, "up", "no");
                status = ipadm_errno2status(err);
                break;
        case IPADM_ADDR_DHCP:
                status = i_ipadm_add_dhcp2nvl(nvl, ipaddr->ipadm_primary,
                    ipaddr->ipadm_wait);
                if (status != IPADM_SUCCESS)
                        goto ret;

                /*
                 * For purposes of updating the ipmgmtd cached representation of
                 * reqhost (ipmgmt_am_reqhost), include a value here in `nvl',
                 * but the value is actually fully persisted as a separate
                 * i_ipadm_persist_propval below.
                 */
                err = nvlist_add_string(nvl, IPADM_NVP_REQHOST,
                    ipaddr->ipadm_reqhost);
                status = ipadm_errno2status(err);
                break;
        case IPADM_ADDR_IPV6_ADDRCONF:
                status = i_ipadm_add_intfid2nvl(nvl, ipaddr);
                break;
        }
        if (status != IPADM_SUCCESS)
                goto ret;

        if (iph->iph_flags & IPH_INIT) {
                /*
                 * IPMGMT_INIT tells the ipmgmtd to set both IPMGMT_ACTIVE and
                 * IPMGMT_PERSIST on the address object in its `aobjmap'.
                 * For the callers ipadm_enable_if() and ipadm_enable_addr(),
                 * IPADM_OPT_PERSIST is not set in their flags. They send
                 * IPH_INIT in iph_flags, so that the address object will be
                 * set as both IPMGMT_ACTIVE and IPMGMT_PERSIST.
                 */
                pflags |= IPMGMT_INIT;
        } else {
                if (flags & IPADM_OPT_ACTIVE)
                        pflags |= IPMGMT_ACTIVE;
                if (flags & IPADM_OPT_PERSIST)
                        pflags |= IPMGMT_PERSIST;
                if (flags & IPADM_OPT_SET_PROPS)
                        pflags |= IPMGMT_PROPS_ONLY;
        }
        status = i_ipadm_addr_persist_nvl(iph, nvl, pflags);

        if (flags & IPADM_OPT_SET_PROPS) {
                /*
                 * Set PERSIST per IPADM_OPT_PROPS_PERSIST, and then un-set the
                 * SET_PROPS bits.
                 */
                flags |= IPADM_OPT_ACTIVE;
                if (flags & IPADM_OPT_PERSIST_PROPS)
                        flags |= IPADM_OPT_PERSIST;
                else
                        flags &= ~IPADM_OPT_PERSIST;
                flags &= ~(IPADM_OPT_SET_PROPS | IPADM_OPT_PERSIST_PROPS);
        }

        if (status == IPADM_SUCCESS && (flags & IPADM_OPT_PERSIST)) {
                char            pbuf[MAXPROPVALLEN], *pval = NULL;
                ipadm_prop_desc_t       *pdp = NULL;

                /*
                 * addprop properties are stored on separate lines in the DB and
                 * not along with the address itself. Call the function that
                 * persists address properties.
                 */

                switch (ipaddr->ipadm_atype) {
                case IPADM_ADDR_STATIC:
                        if (!default_prefixlen && (propname == NULL ||
                            strcmp(propname, IPADM_NVP_PREFIXLEN) == 0)) {
                                pdp = i_ipadm_get_addrprop_desc(
                                    IPADM_NVP_PREFIXLEN);
                                (void) snprintf(pbuf, sizeof (pbuf), "%u",
                                    ipaddr->ipadm_static_prefixlen);
                                pval = pbuf;
                        }
                        break;
                case IPADM_ADDR_DHCP:
                        if (propname == NULL ||
                            strcmp(propname, IPADM_NVP_REQHOST) == 0) {
                                pdp = i_ipadm_get_addrprop_desc(
                                    IPADM_NVP_REQHOST);
                                pval = ipaddr->ipadm_reqhost;
                        }
                        break;
                default:
                        break;
                }

                if (pval != NULL) {
                        assert(pdp != NULL);
                        status = i_ipadm_persist_propval(iph, pdp, pval,
                            ipaddr, flags);
                }
        }

ret:
        nvlist_free(nvl);
        return (status);
}

/*
 * Makes the door call to ipmgmtd to store the address object in the
 * nvlist `nvl'.
 */
static ipadm_status_t
i_ipadm_addr_persist_nvl(ipadm_handle_t iph, nvlist_t *nvl, uint32_t flags)
{
        char                    *buf = NULL, *nvlbuf = NULL;
        size_t                  nvlsize, bufsize;
        ipmgmt_setaddr_arg_t    *sargp;
        int                     err;

        err = nvlist_pack(nvl, &nvlbuf, &nvlsize, NV_ENCODE_NATIVE, 0);
        if (err != 0)
                return (ipadm_errno2status(err));
        bufsize = sizeof (*sargp) + nvlsize;
        buf = calloc(1, bufsize);
        sargp = (void *)buf;
        sargp->ia_cmd = IPMGMT_CMD_SETADDR;
        sargp->ia_flags = flags;
        sargp->ia_nvlsize = nvlsize;
        (void) bcopy(nvlbuf, buf + sizeof (*sargp), nvlsize);
        err = ipadm_door_call(iph, buf, bufsize, NULL, 0, B_FALSE);
        free(buf);
        free(nvlbuf);
        return (ipadm_errno2status(err));
}

/*
 * Makes a door call to ipmgmtd to remove the address object in `ipaddr'
 * from its `aobjmap'. This door call also removes the address object and all
 * its properties from the persistent DB if IPADM_OPT_PERSIST is set in
 * `flags', so that the object will not be recreated on next reboot or on an
 * ipadm_enable_addr()/ipadm_enable_if() call.
 */
ipadm_status_t
i_ipadm_delete_addrobj(ipadm_handle_t iph, const ipadm_addrobj_t ipaddr,
    uint32_t flags)
{
        ipmgmt_addr_arg_t       arg;
        int                     err;

        arg.ia_cmd = IPMGMT_CMD_RESETADDR;
        arg.ia_flags = 0;
        if (flags & IPADM_OPT_ACTIVE)
                arg.ia_flags |= IPMGMT_ACTIVE;
        if (flags & IPADM_OPT_PERSIST)
                arg.ia_flags |= IPMGMT_PERSIST;
        (void) strlcpy(arg.ia_aobjname, ipaddr->ipadm_aobjname,
            sizeof (arg.ia_aobjname));
        arg.ia_lnum = ipaddr->ipadm_lifnum;
        err = ipadm_door_call(iph, &arg, sizeof (arg), NULL, 0, B_FALSE);
        return (ipadm_errno2status(err));
}

/*
 * Checks if the caller is authorized for the up/down operation.
 * Retrieves the address object corresponding to `aobjname' from ipmgmtd
 * and retrieves the address flags for that object from kernel.
 * The arguments `ipaddr' and `ifflags' must be allocated by the caller.
 */
static ipadm_status_t
i_ipadm_updown_common(ipadm_handle_t iph, const char *aobjname,
    ipadm_addrobj_t ipaddr, uint32_t ipadm_flags, uint64_t *ifflags)
{
        ipadm_status_t  status;
        char            lifname[LIFNAMSIZ];

        /* check for solaris.network.interface.config authorization */
        if (!ipadm_check_auth())
                return (IPADM_EAUTH);

        /* validate input */
        if (aobjname == NULL || strlcpy(ipaddr->ipadm_aobjname, aobjname,
            IPADM_AOBJSIZ) >= IPADM_AOBJSIZ) {
                return (IPADM_INVALID_ARG);
        }

        /* Retrieve the address object information. */
        status = i_ipadm_get_addrobj(iph, ipaddr);
        if (status != IPADM_SUCCESS)
                return (status);

        if (!(ipaddr->ipadm_flags & IPMGMT_ACTIVE))
                return (IPADM_OP_DISABLE_OBJ);
        if ((ipadm_flags & IPADM_OPT_PERSIST) &&
            !(ipaddr->ipadm_flags & IPMGMT_PERSIST))
                return (IPADM_TEMPORARY_OBJ);
        if (ipaddr->ipadm_atype == IPADM_ADDR_IPV6_ADDRCONF ||
            (ipaddr->ipadm_atype == IPADM_ADDR_DHCP &&
            (ipadm_flags & IPADM_OPT_PERSIST)))
                return (IPADM_NOTSUP);

        i_ipadm_addrobj2lifname(ipaddr, lifname, sizeof (lifname));
        return (i_ipadm_get_flags(iph, lifname, ipaddr->ipadm_af, ifflags));
}

/*
 * Marks the address in the address object `aobjname' up. This operation is
 * not supported for an address object of type IPADM_ADDR_IPV6_ADDRCONF.
 * For an address object of type IPADM_ADDR_DHCP, this operation can
 * only be temporary and no updates will be made to the persistent DB.
 */
ipadm_status_t
ipadm_up_addr(ipadm_handle_t iph, const char *aobjname, uint32_t ipadm_flags)
{
        struct ipadm_addrobj_s ipaddr;
        ipadm_status_t  status;
        uint64_t        flags;
        char            lifname[LIFNAMSIZ];

        status = i_ipadm_updown_common(iph, aobjname, &ipaddr, ipadm_flags,
            &flags);
        if (status != IPADM_SUCCESS)
                return (status);
        if (flags & IFF_UP)
                goto persist;
        /*
         * If the address is already a duplicate, then refresh-addr
         * should be used to mark it up.
         */
        if (flags & IFF_DUPLICATE)
                return (IPADM_DAD_FOUND);

        i_ipadm_addrobj2lifname(&ipaddr, lifname, sizeof (lifname));
        status = i_ipadm_set_flags(iph, lifname, ipaddr.ipadm_af, IFF_UP, 0);
        if (status != IPADM_SUCCESS)
                return (status);

persist:
        /* Update persistent DB. */
        if (ipadm_flags & IPADM_OPT_PERSIST) {
                status = i_ipadm_persist_propval(iph, &up_addrprop,
                    "yes", &ipaddr, 0);
        }

        return (status);
}

/*
 * Marks the address in the address object `aobjname' down. This operation is
 * not supported for an address object of type IPADM_ADDR_IPV6_ADDRCONF.
 * For an address object of type IPADM_ADDR_DHCP, this operation can
 * only be temporary and no updates will be made to the persistent DB.
 */
ipadm_status_t
ipadm_down_addr(ipadm_handle_t iph, const char *aobjname, uint32_t ipadm_flags)
{
        struct ipadm_addrobj_s ipaddr;
        ipadm_status_t  status;
        struct lifreq   lifr;
        uint64_t        flags;

        status = i_ipadm_updown_common(iph, aobjname, &ipaddr, ipadm_flags,
            &flags);
        if (status != IPADM_SUCCESS)
                return (status);
        i_ipadm_addrobj2lifname(&ipaddr, lifr.lifr_name,
            sizeof (lifr.lifr_name));
        if (flags & IFF_UP) {
                status = i_ipadm_set_flags(iph, lifr.lifr_name,
                    ipaddr.ipadm_af, 0, IFF_UP);
                if (status != IPADM_SUCCESS)
                        return (status);
        } else if (flags & IFF_DUPLICATE) {
                /*
                 * Clear the IFF_DUPLICATE flag.
                 */
                if (ioctl(iph->iph_sock, SIOCGLIFADDR, &lifr) < 0)
                        return (ipadm_errno2status(errno));
                if (ioctl(iph->iph_sock, SIOCSLIFADDR, &lifr) < 0)
                        return (ipadm_errno2status(errno));
        }

        /* Update persistent DB */
        if (ipadm_flags & IPADM_OPT_PERSIST) {
                status = i_ipadm_persist_propval(iph, &up_addrprop,
                    "no", &ipaddr, 0);
        }

        return (status);
}

/*
 * Refreshes the address in the address object `aobjname'. If the address object
 * is of type IPADM_ADDR_STATIC, DAD is re-initiated on the address. If
 * `ipadm_flags' has IPADM_OPT_INFORM set, a DHCP_INFORM message is sent to the
 * dhcpagent for this static address. If the address object is of type
 * IPADM_ADDR_DHCP, a DHCP_EXTEND message is sent to the dhcpagent.
 * If a dhcp address has not yet been acquired, a DHCP_START is sent to the
 * dhcpagent. This operation is not supported for an address object of
 * type IPADM_ADDR_IPV6_ADDRCONF.
 */
ipadm_status_t
ipadm_refresh_addr(ipadm_handle_t iph, const char *aobjname,
    uint32_t ipadm_flags)
{
        ipadm_status_t          status = IPADM_SUCCESS;
        uint64_t                flags;
        struct ipadm_addrobj_s  ipaddr;
        sa_family_t             af;
        char                    lifname[LIFNAMSIZ];
        boolean_t               inform =
            ((ipadm_flags & IPADM_OPT_INFORM) != 0);

        /* check for solaris.network.interface.config authorization */
        if (!ipadm_check_auth())
                return (IPADM_EAUTH);

        bzero(&ipaddr, sizeof (ipaddr));
        /* validate input */
        if (aobjname == NULL || strlcpy(ipaddr.ipadm_aobjname, aobjname,
            IPADM_AOBJSIZ) >= IPADM_AOBJSIZ) {
                return (IPADM_INVALID_ARG);
        }

        /* Retrieve the address object information. */
        status = i_ipadm_get_addrobj(iph, &ipaddr);
        if (status != IPADM_SUCCESS)
                return (status);

        if (!(ipaddr.ipadm_flags & IPMGMT_ACTIVE))
                return (IPADM_OP_DISABLE_OBJ);

        if (i_ipadm_is_vni(ipaddr.ipadm_ifname))
                return (IPADM_NOTSUP);
        if (inform && ipaddr.ipadm_atype != IPADM_ADDR_STATIC)
                return (IPADM_INVALID_ARG);
        af = ipaddr.ipadm_af;
        if (ipaddr.ipadm_atype == IPADM_ADDR_STATIC) {
                i_ipadm_addrobj2lifname(&ipaddr, lifname, sizeof (lifname));
                status = i_ipadm_get_flags(iph, lifname, af, &flags);
                if (status != IPADM_SUCCESS)
                        return (status);
                if (inform) {
                        if (dhcp_start_agent(DHCP_IPC_MAX_WAIT) == -1)
                                return (IPADM_DHCP_START_ERROR);

                        ipaddr.ipadm_wait = IPADM_DHCP_WAIT_DEFAULT;
                        return (i_ipadm_op_dhcp(&ipaddr, DHCP_INFORM, NULL));
                }
                if (!(flags & IFF_DUPLICATE))
                        return (IPADM_SUCCESS);
                status = i_ipadm_set_flags(iph, lifname, af, IFF_UP, 0);
        } else if (ipaddr.ipadm_atype == IPADM_ADDR_DHCP) {
                status = i_ipadm_refresh_dhcp(&ipaddr);
        } else {
                status = IPADM_NOTSUP;
        }
        return (status);
}

/*
 * This is called from ipadm_refresh_addr() and i_ipadm_set_reqhost() to
 * send a DHCP_EXTEND message and possibly a DHCP_START message
 * to the dhcpagent.
 */
static ipadm_status_t
i_ipadm_refresh_dhcp(ipadm_addrobj_t ipaddr)
{
        ipadm_status_t          status;
        int                     dherr;

        status = i_ipadm_op_dhcp(ipaddr, DHCP_EXTEND, &dherr);
        /*
         * Restart the dhcp address negotiation with server if no
         * address has been acquired yet.
         */
        if (status != IPADM_SUCCESS && dherr == DHCP_IPC_E_OUTSTATE) {
                ipaddr->ipadm_wait = IPADM_DHCP_WAIT_DEFAULT;
                status = i_ipadm_op_dhcp(ipaddr, DHCP_START, NULL);
        }

        return (status);
}

/*
 * This is called from ipadm_create_addr() to validate the address parameters.
 * It does the following steps:
 * 1. Validates the interface name.
 * 2. Verifies that the interface is not an IPMP meta-interface or an
 *      underlying interface.
 * 3. In case of a persistent operation, verifies that the interface
 *      is persistent. Returns error if interface is not enabled but
 *      is in persistent config.
 * 4. Verifies that the destination address is not set or the address type is
 *      not DHCP or ADDRCONF when the interface is a loopback interface.
 * 5. Verifies that the address type is not DHCP or ADDRCONF when the interface
 *      has IFF_VRRP interface flag set.
 */
static ipadm_status_t
i_ipadm_validate_create_addr(ipadm_handle_t iph, ipadm_addrobj_t ipaddr,
    uint32_t flags)
{
        sa_family_t             af;
        sa_family_t             other_af;
        char                    *ifname;
        ipadm_status_t          status;
        boolean_t               legacy = (iph->iph_flags & IPH_LEGACY);
        boolean_t               islo, isvni;
        uint64_t                ifflags = 0;
        boolean_t               p_exists;
        boolean_t               af_exists, other_af_exists, a_exists;

        if (ipaddr == NULL || flags == 0 || flags == IPADM_OPT_PERSIST ||
            (flags & ~(IPADM_COMMON_OPT_MASK|IPADM_OPT_UP|IPADM_OPT_V46))) {
                return (IPADM_INVALID_ARG);
        }

        if (ipaddr->ipadm_af == AF_UNSPEC)
                return (IPADM_BAD_ADDR);

        if (!legacy && ipaddr->ipadm_lifnum != 0)
                return (IPADM_INVALID_ARG);

        if (legacy && ipaddr->ipadm_atype != IPADM_ADDR_STATIC)
                return (IPADM_NOTSUP);

        ifname = ipaddr->ipadm_ifname;

        if (i_ipadm_is_ipmp(iph, ifname) || i_ipadm_is_under_ipmp(iph, ifname))
                return (IPADM_NOTSUP);

        af = ipaddr->ipadm_af;
        af_exists = ipadm_if_enabled(iph, ifname, af);
        /*
         * For legacy case, interfaces are not implicitly plumbed. We need to
         * check if the interface exists in the active configuration.
         */
        if (legacy && !af_exists)
                return (IPADM_ENXIO);

        other_af = (af == AF_INET ? AF_INET6 : AF_INET);
        other_af_exists = ipadm_if_enabled(iph, ifname, other_af);
        /*
         * Check if one of the v4 or the v6 interfaces exists in the
         * active configuration. An interface is considered disabled only
         * if both v4 and v6 are not active.
         */
        a_exists = (af_exists || other_af_exists);

        /* Check if interface exists in the persistent configuration. */
        status = i_ipadm_if_pexists(iph, ifname, af, &p_exists);
        if (status != IPADM_SUCCESS)
                return (status);
        if (!a_exists && p_exists)
                return (IPADM_OP_DISABLE_OBJ);
        if ((flags & IPADM_OPT_PERSIST) && a_exists && !p_exists) {
                /*
                 * If address has to be created persistently,
                 * and the interface does not exist in the persistent
                 * store but in active config, fail.
                 */
                return (IPADM_TEMPORARY_OBJ);
        }
        if (af_exists) {
                status = i_ipadm_get_flags(iph, ifname, af, &ifflags);
                if (status != IPADM_SUCCESS)
                        return (status);
        }

        /* Perform validation steps (4) and (5) */
        islo = i_ipadm_is_loopback(ifname);
        isvni = i_ipadm_is_vni(ifname);
        switch (ipaddr->ipadm_atype) {
        case IPADM_ADDR_STATIC:
                if ((islo || isvni) && ipaddr->ipadm_static_dname[0] != '\0')
                        return (IPADM_INVALID_ARG);
                /* Check for a valid src address */
                if (!legacy && sockaddrunspec(
                    (struct sockaddr *)&ipaddr->ipadm_static_addr))
                        return (IPADM_BAD_ADDR);
                break;
        case IPADM_ADDR_DHCP:
                if (islo || (ifflags & IFF_VRRP))
                        return (IPADM_NOTSUP);
                break;
        case IPADM_ADDR_IPV6_ADDRCONF:
                if (islo || (ifflags & IFF_VRRP) ||
                    i_ipadm_is_6to4(iph, ifname)) {
                        return (IPADM_NOTSUP);
                }
                break;
        default:
                return (IPADM_INVALID_ARG);
        }

        return (IPADM_SUCCESS);
}

ipadm_status_t
i_ipadm_merge_addrprops_from_nvl(nvlist_t *invl, nvlist_t *onvl,
    const char *aobjname)
{
        const char * const      ADDRPROPS[] =
            { IPADM_NVP_PREFIXLEN, IPADM_NVP_REQHOST };
        const size_t            ADDRPROPSLEN =
            sizeof (ADDRPROPS) / sizeof (*ADDRPROPS);
        nvpair_t        *nvp, *propnvp;
        nvlist_t        *tnvl;
        char            *aname;
        const char      *propname;
        size_t          i;
        int             err;

        for (i = 0; i < ADDRPROPSLEN; ++i) {
                propname = ADDRPROPS[i];

                for (nvp = nvlist_next_nvpair(invl, NULL); nvp != NULL;
                    nvp = nvlist_next_nvpair(invl, nvp)) {
                        if (nvpair_value_nvlist(nvp, &tnvl) == 0 &&
                            nvlist_exists(tnvl, propname) &&
                            nvlist_lookup_string(tnvl, IPADM_NVP_AOBJNAME,
                            &aname) == 0 && strcmp(aname, aobjname) == 0) {

                                /*
                                 * property named `propname' exists for given
                                 * aobj
                                 */
                                (void) nvlist_lookup_nvpair(tnvl, propname,
                                    &propnvp);
                                err = nvlist_add_nvpair(onvl, propnvp);
                                if (err == 0) {
                                        err = nvlist_remove(invl,
                                            nvpair_name(nvp), nvpair_type(nvp));
                                }
                                if (err != 0)
                                        return (ipadm_errno2status(err));
                                break;
                        }
                }
        }
        return (IPADM_SUCCESS);
}

/*
 * Re-enables the address object `aobjname' based on the saved
 * configuration for `aobjname'.
 */
ipadm_status_t
ipadm_enable_addr(ipadm_handle_t iph, const char *aobjname, uint32_t flags)
{
        nvlist_t        *addrnvl, *nvl;
        nvpair_t        *nvp;
        ipadm_status_t  status;
        struct ipadm_addrobj_s ipaddr;

        /* check for solaris.network.interface.config authorization */
        if (!ipadm_check_auth())
                return (IPADM_EAUTH);

        /* validate input */
        if (flags & IPADM_OPT_PERSIST)
                return (IPADM_NOTSUP);
        if (aobjname == NULL || strlcpy(ipaddr.ipadm_aobjname, aobjname,
            IPADM_AOBJSIZ) >= IPADM_AOBJSIZ) {
                return (IPADM_INVALID_ARG);
        }

        /* Retrieve the address object information. */
        status = i_ipadm_get_addrobj(iph, &ipaddr);
        if (status != IPADM_SUCCESS)
                return (status);
        if (ipaddr.ipadm_flags & IPMGMT_ACTIVE)
                return (IPADM_ADDROBJ_EXISTS);

        status = i_ipadm_get_db_addr(iph, NULL, aobjname, &addrnvl);
        if (status != IPADM_SUCCESS)
                return (status);

        assert(addrnvl != NULL);

        for (nvp = nvlist_next_nvpair(addrnvl, NULL); nvp != NULL;
            nvp = nvlist_next_nvpair(addrnvl, nvp)) {
                if (nvpair_value_nvlist(nvp, &nvl) != 0)
                        continue;

                if (nvlist_exists(nvl, IPADM_NVP_IPV4ADDR) ||
                    nvlist_exists(nvl, IPADM_NVP_IPV6ADDR) ||
                    nvlist_exists(nvl, IPADM_NVP_DHCP)) {
                        status = i_ipadm_merge_addrprops_from_nvl(addrnvl, nvl,
                            aobjname);
                        if (status != IPADM_SUCCESS)
                                continue;
                }
                iph->iph_flags |= IPH_INIT;
                status = i_ipadm_init_addrobj(iph, nvl);
                iph->iph_flags &= ~IPH_INIT;
                if (status != IPADM_SUCCESS)
                        break;
        }

        nvlist_free(addrnvl);
        return (status);
}

/*
 * Disables the address object in `aobjname' from the active configuration.
 * Error code return values follow the model in ipadm_delete_addr().
 */
ipadm_status_t
ipadm_disable_addr(ipadm_handle_t iph, const char *aobjname, uint32_t flags)
{
        /* validate input */
        if (flags & IPADM_OPT_PERSIST)
                return (IPADM_NOTSUP);

        return (ipadm_delete_addr(iph, aobjname, IPADM_OPT_ACTIVE));
}