/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <ifaddrs.h>

#include <arpa/inet.h>

#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <netinet6/nd6.h>       /* Define ND6_INFINITE_LIFETIME */

#include "ifconfig.h"
#include "ifconfig_netlink.h"

#ifndef WITHOUT_NETLINK
struct in6_px {
        struct in6_addr         addr;
        int                     plen;
        bool                    set;
};
struct in6_pdata {
        struct in6_px           addr;
        struct in6_px           dst_addr;
        struct in6_addrlifetime lifetime;
        uint32_t                flags;
        uint32_t                vhid;
};

static struct in6_pdata in6_del;
static struct in6_pdata in6_add = {
        .lifetime = { 0, 0, ND6_INFINITE_LIFETIME, ND6_INFINITE_LIFETIME },
};
#else
static  struct in6_ifreq in6_ridreq;
static  struct in6_aliasreq in6_addreq =
  { .ifra_flags = 0,
    .ifra_lifetime = { 0, 0, ND6_INFINITE_LIFETIME, ND6_INFINITE_LIFETIME } };
#endif
static  int ip6lifetime;

#ifdef WITHOUT_NETLINK
static  int prefix(void *, int);
#endif
static  char *sec2str(time_t);
static  int explicit_prefix = 0;
extern  char *f_inet6, *f_addr;

extern void setnd6flags(if_ctx *, const char *, int);
extern void setnd6defif(if_ctx *,const char *, int);
extern void nd6_status(if_ctx *);

static  char addr_buf[NI_MAXHOST];      /*for getnameinfo()*/

static void
setifprefixlen(if_ctx *ctx __netlink_unused, const char *addr, int dummy __unused)
{
#ifdef WITHOUT_NETLINK
        const struct afswtch *afp = ctx->afp;

        if (afp->af_getprefix != NULL)
                afp->af_getprefix(addr, MASK);
#else
        int plen = strtol(addr, NULL, 10);

        if ((plen < 0) || (plen > 128))
                errx(1, "%s: bad value", addr);
        in6_add.addr.plen = plen;
#endif
        explicit_prefix = 1;
}

static void
setip6flags(if_ctx *ctx, const char *dummyaddr __unused, int flag)
{
        const struct afswtch *afp = ctx->afp;

        if (afp->af_af != AF_INET6)
                err(1, "address flags can be set only for inet6 addresses");

#ifdef WITHOUT_NETLINK
        if (flag < 0)
                in6_addreq.ifra_flags &= ~(-flag);
        else
                in6_addreq.ifra_flags |= flag;
#else
        if (flag < 0)
                in6_add.flags &= ~(-flag);
        else
                in6_add.flags |= flag;
#endif
}

static void
setip6lifetime(if_ctx *ctx, const char *cmd, const char *val)
{
        const struct afswtch *afp = ctx->afp;
        struct timespec now;
        time_t newval;
        char *ep;
#ifdef WITHOUT_NETLINK
        struct in6_addrlifetime *lifetime = &in6_addreq.ifra_lifetime;
#else
        struct in6_addrlifetime *lifetime = &in6_add.lifetime;
#endif

        clock_gettime(CLOCK_MONOTONIC_FAST, &now);
        newval = (time_t)strtoul(val, &ep, 0);
        if (val == ep)
                errx(1, "invalid %s", cmd);
        if (afp->af_af != AF_INET6)
                errx(1, "%s not allowed for the AF", cmd);
        if (strcmp(cmd, "vltime") == 0) {
                lifetime->ia6t_expire = now.tv_sec + newval;
                lifetime->ia6t_vltime = newval;
        } else if (strcmp(cmd, "pltime") == 0) {
                lifetime->ia6t_preferred = now.tv_sec + newval;
                lifetime->ia6t_pltime = newval;
        }
}

static void
setip6pltime(if_ctx *ctx, const char *seconds, int dummy __unused)
{
        setip6lifetime(ctx, "pltime", seconds);
}

static void
setip6vltime(if_ctx *ctx, const char *seconds, int dummy __unused)
{
        setip6lifetime(ctx, "vltime", seconds);
}

static void
setip6eui64(if_ctx *ctx, const char *cmd, int dummy __unused)
{
        const struct afswtch *afp = ctx->afp;
        struct ifaddrs *ifap, *ifa;
        const struct sockaddr_in6 *sin6 = NULL;
        const struct in6_addr *lladdr = NULL;
        struct in6_addr *in6;

        if (afp->af_af != AF_INET6)
                errx(EXIT_FAILURE, "%s not allowed for the AF", cmd);
#ifdef WITHOUT_NETLINK
        in6 = (struct in6_addr *)&in6_addreq.ifra_addr.sin6_addr;
#else
        in6 = &in6_add.addr.addr;
#endif
        if (memcmp(&in6addr_any.s6_addr[8], &in6->s6_addr[8], 8) != 0)
                errx(EXIT_FAILURE, "interface index is already filled");
        if (getifaddrs(&ifap) != 0)
                err(EXIT_FAILURE, "getifaddrs");
        for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
                if (ifa->ifa_addr->sa_family == AF_INET6 &&
                    strcmp(ifa->ifa_name, ctx->ifname) == 0) {
                        sin6 = (const struct sockaddr_in6 *)satosin6(ifa->ifa_addr);
                        if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
                                lladdr = &sin6->sin6_addr;
                                break;
                        }
                }
        }
        if (!lladdr)
                errx(EXIT_FAILURE, "could not determine link local address"); 

        memcpy(&in6->s6_addr[8], &lladdr->s6_addr[8], 8);

        freeifaddrs(ifap);
}

static void
print_addr(struct sockaddr_in6 *sin)
{
        int error, n_flags;

        if (f_addr != NULL && strcmp(f_addr, "fqdn") == 0)
                n_flags = 0;
        else if (f_addr != NULL && strcmp(f_addr, "host") == 0)
                n_flags = NI_NOFQDN;
        else
                n_flags = NI_NUMERICHOST;
        error = getnameinfo((struct sockaddr *)sin, sin->sin6_len,
                            addr_buf, sizeof(addr_buf), NULL, 0,
                            n_flags);
        if (error != 0)
                inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf,
                          sizeof(addr_buf));
        printf("\tinet6 %s", addr_buf);
}

static void
print_p2p(struct sockaddr_in6 *sin)
{
        int error;

        error = getnameinfo((struct sockaddr *)sin, sin->sin6_len, addr_buf,
            sizeof(addr_buf), NULL, 0, NI_NUMERICHOST);

        if (error != 0)
                inet_ntop(AF_INET6, &sin->sin6_addr, addr_buf, sizeof(addr_buf));
        printf(" --> %s", addr_buf);
}

static void
print_mask(int plen)
{
        if (f_inet6 != NULL && strcmp(f_inet6, "cidr") == 0)
                printf("/%d", plen);
        else
                printf(" prefixlen %d", plen);
}

static void
print_flags(int flags6)
{
        if ((flags6 & IN6_IFF_ANYCAST) != 0)
                printf(" anycast");
        if ((flags6 & IN6_IFF_TENTATIVE) != 0)
                printf(" tentative");
        if ((flags6 & IN6_IFF_DUPLICATED) != 0)
                printf(" duplicated");
        if ((flags6 & IN6_IFF_DETACHED) != 0)
                printf(" detached");
        if ((flags6 & IN6_IFF_DEPRECATED) != 0)
                printf(" deprecated");
        if ((flags6 & IN6_IFF_AUTOCONF) != 0)
                printf(" autoconf");
        if ((flags6 & IN6_IFF_TEMPORARY) != 0)
                printf(" temporary");
        if ((flags6 & IN6_IFF_PREFER_SOURCE) != 0)
                printf(" prefer_source");

}

static void
print_lifetime(const char *prepend, time_t px_time, struct timespec *now)
{
        printf(" %s", prepend);
        if (px_time == 0)
                printf(" infty");

        printf(" %s", px_time < now->tv_sec ? "0" : sec2str(px_time - now->tv_sec));
}

#ifdef WITHOUT_NETLINK
static void
in6_status(if_ctx *ctx, const struct ifaddrs *ifa)
{
        struct sockaddr_in6 *sin, null_sin = {};
        struct in6_ifreq ifr6;
        int s6;
        u_int32_t flags6;
        struct in6_addrlifetime lifetime;

        sin = satosin6(ifa->ifa_addr);
        if (sin == NULL)
                return;

        strlcpy(ifr6.ifr_name, ctx->ifname, sizeof(ifr6.ifr_name));
        if ((s6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
                warn("socket(AF_INET6,SOCK_DGRAM)");
                return;
        }
        ifr6.ifr_addr = *sin;
        if (ioctl(s6, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
                warn("ioctl(SIOCGIFAFLAG_IN6)");
                close(s6);
                return;
        }
        flags6 = ifr6.ifr_ifru.ifru_flags6;
        memset(&lifetime, 0, sizeof(lifetime));
        ifr6.ifr_addr = *sin;
        if (ioctl(s6, SIOCGIFALIFETIME_IN6, &ifr6) < 0) {
                warn("ioctl(SIOCGIFALIFETIME_IN6)");
                close(s6);
                return;
        }
        lifetime = ifr6.ifr_ifru.ifru_lifetime;
        close(s6);

        print_addr(sin);

        if (ifa->ifa_flags & IFF_POINTOPOINT) {
                sin = satosin6(ifa->ifa_dstaddr);
                /*
                 * some of the interfaces do not have valid destination
                 * address.
                 */
                if (sin != NULL && sin->sin6_family == AF_INET6)
                        print_p2p(sin);
        }

        sin = satosin6(ifa->ifa_netmask);
        if (sin == NULL)
                sin = &null_sin;
        print_mask(prefix(&sin->sin6_addr, sizeof(struct in6_addr)));

        print_flags(flags6);

        if ((satosin6(ifa->ifa_addr))->sin6_scope_id)
                printf(" scopeid 0x%x",
                    (satosin6(ifa->ifa_addr))->sin6_scope_id);

        if (ip6lifetime && (lifetime.ia6t_preferred || lifetime.ia6t_expire)) {
                struct timespec now;

                clock_gettime(CLOCK_MONOTONIC_FAST, &now);
                print_lifetime("pltime", lifetime.ia6t_preferred, &now);
                print_lifetime("vltime", lifetime.ia6t_expire, &now);
        }

        print_vhid(ifa);

        putchar('\n');
}

#else
static void
show_lifetime(struct ifa_cacheinfo *ci)
{
        struct timespec now;
        uint32_t pl, vl;

        if (ci == NULL)
                return;

        int count = ci->ifa_prefered != ND6_INFINITE_LIFETIME;
        count += ci->ifa_valid != ND6_INFINITE_LIFETIME;
        if (count == 0)
                return;

        pl = (ci->ifa_prefered == ND6_INFINITE_LIFETIME) ? 0 : ci->ifa_prefered;
        vl = (ci->ifa_valid == ND6_INFINITE_LIFETIME) ? 0 : ci->ifa_valid;

        clock_gettime(CLOCK_MONOTONIC_FAST, &now);
        print_lifetime("pltime",
            pl + (ip6lifetime ? ci->tstamp / 1000 : now.tv_sec), &now);
        print_lifetime("vltime",
            vl + (ip6lifetime ? ci->tstamp / 1000 : now.tv_sec), &now);
}

static void
in6_status_nl(if_ctx *ctx __unused, if_link_t *link __unused, if_addr_t *ifa)
{
        int plen = ifa->ifa_prefixlen;
        uint32_t scopeid;

        if (ifa->ifa_local == NULL) {
                /* Non-P2P address */
                scopeid = satosin6(ifa->ifa_address)->sin6_scope_id;
                print_addr(satosin6(ifa->ifa_address));
        } else {
                scopeid = satosin6(ifa->ifa_local)->sin6_scope_id;
                print_addr(satosin6(ifa->ifa_local));
                print_p2p(satosin6(ifa->ifa_address));
        }

        print_mask(plen);
        print_flags(ifa->ifaf_flags);

        if (scopeid != 0)
                printf(" scopeid 0x%x", scopeid);

        show_lifetime(ifa->ifa_cacheinfo);

        if (ifa->ifaf_vhid != 0)
                printf(" vhid %d", ifa->ifaf_vhid);

        putchar('\n');
}

static struct in6_px *sin6tab_nl[] = {
        &in6_del.addr,          /* RIDADDR */
        &in6_add.addr,          /* ADDR */
        NULL,                   /* MASK */
        &in6_add.dst_addr,      /* DSTADDR*/
};

static void
in6_copyaddr(if_ctx *ctx __unused, int to, int from)
{
        sin6tab_nl[to]->addr = sin6tab_nl[from]->addr;
        sin6tab_nl[to]->set = sin6tab_nl[from]->set;
}

static void
in6_getaddr(const char *addr_str, int which)
{
        struct in6_px *px = sin6tab_nl[which];

        if (which == MASK)
                errx(1, "netmask: invalid option for inet6");
        if (which == BRDADDR)
                errx(1, "broadcast: invalid option for inet6");

        px->set = true;
        px->plen = 128;
        if (which == ADDR) {
                char *p = NULL;
                if((p = strrchr(addr_str, '/')) != NULL) {
                        *p = '\0';
                        int plen = strtol(p + 1, NULL, 10);
                        if (plen < 0 || plen > 128)
                                errx(1, "%s: bad value", p + 1);
                        px->plen = plen;
                        explicit_prefix = 1;
                }
        }

        struct addrinfo hints = { .ai_family = AF_INET6 };
        struct addrinfo *res;

        int error = getaddrinfo(addr_str, NULL, &hints, &res);
        if (error != 0) {
                if (inet_pton(AF_INET6, addr_str, &px->addr) != 1)
                        errx(1, "%s: bad value", addr_str);
        } else {
                struct sockaddr_in6 *sin6;

                sin6 = (struct sockaddr_in6 *)(void *)res->ai_addr;
                px->addr = sin6->sin6_addr;
                freeaddrinfo(res);
        }
}

static int
in6_exec_nl(if_ctx *ctx, unsigned long action, void *data)
{
        struct in6_pdata *pdata = (struct in6_pdata *)data;
        struct snl_writer nw = {};

        snl_init_writer(ctx->io_ss, &nw);
        struct nlmsghdr *hdr = snl_create_msg_request(&nw, action);
        struct ifaddrmsg *ifahdr = snl_reserve_msg_object(&nw, struct ifaddrmsg);

        ifahdr->ifa_family = AF_INET6;
        ifahdr->ifa_prefixlen = pdata->addr.plen;
        ifahdr->ifa_index = if_nametoindex_nl(ctx->io_ss, ctx->ifname);

        snl_add_msg_attr_ip6(&nw, IFA_LOCAL, &pdata->addr.addr);
        if (action == NL_RTM_NEWADDR && pdata->dst_addr.set)
                snl_add_msg_attr_ip6(&nw, IFA_ADDRESS, &pdata->dst_addr.addr);

        struct ifa_cacheinfo ci = {
                .ifa_prefered = pdata->lifetime.ia6t_pltime,
                .ifa_valid =  pdata->lifetime.ia6t_vltime,
        };
        snl_add_msg_attr(&nw, IFA_CACHEINFO, sizeof(ci), &ci);

        int off = snl_add_msg_attr_nested(&nw, IFA_FREEBSD);
        snl_add_msg_attr_u32(&nw, IFAF_FLAGS, pdata->flags);
        if (pdata->vhid != 0)
                snl_add_msg_attr_u32(&nw, IFAF_VHID, pdata->vhid);
        snl_end_attr_nested(&nw, off);

        if (! (hdr = snl_finalize_msg(&nw)) || !snl_send_message(ctx->io_ss, hdr))
                return (0);

        struct snl_errmsg_data e = {};
        snl_read_reply_code(ctx->io_ss, hdr->nlmsg_seq, &e);

        return (e.error);
}
#endif

#ifdef WITHOUT_NETLINK
static struct   sockaddr_in6 *sin6tab[] = {
        &in6_ridreq.ifr_addr, &in6_addreq.ifra_addr,
        &in6_addreq.ifra_prefixmask, &in6_addreq.ifra_dstaddr
};

static void
in6_copyaddr(if_ctx *ctx __unused, int to, int from)
{
        memcpy(sin6tab[to], sin6tab[from], sizeof(struct sockaddr_in6));
}

static void
in6_getprefix(const char *plen, int which)
{
        struct sockaddr_in6 *sin = sin6tab[which];
        u_char *cp;
        int len = atoi(plen);

        if ((len < 0) || (len > 128))
                errx(1, "%s: bad value", plen);
        sin->sin6_len = sizeof(*sin);
        if (which != MASK)
                sin->sin6_family = AF_INET6;
        if ((len == 0) || (len == 128)) {
                memset(&sin->sin6_addr, 0xff, sizeof(struct in6_addr));
                return;
        }
        memset((void *)&sin->sin6_addr, 0x00, sizeof(sin->sin6_addr));
        for (cp = (u_char *)&sin->sin6_addr; len > 7; len -= 8)
                *cp++ = 0xff;
        *cp = 0xff << (8 - len);
}

static void
in6_getaddr(const char *s, int which)
{
        struct sockaddr_in6 *sin = sin6tab[which];
        struct addrinfo hints, *res;
        int error = -1;

        sin->sin6_len = sizeof(*sin);
        if (which != MASK)
                sin->sin6_family = AF_INET6;

        if (which == ADDR) {
                char *p = NULL;
                if((p = strrchr(s, '/')) != NULL) {
                        *p = '\0';
                        in6_getprefix(p + 1, MASK);
                        explicit_prefix = 1;
                }
        }

        if (sin->sin6_family == AF_INET6) {
                bzero(&hints, sizeof(struct addrinfo));
                hints.ai_family = AF_INET6;
                error = getaddrinfo(s, NULL, &hints, &res);
                if (error != 0) {
                        if (inet_pton(AF_INET6, s, &sin->sin6_addr) != 1)
                                errx(1, "%s: bad value", s);
                } else {
                        bcopy(res->ai_addr, sin, res->ai_addrlen);
                        freeaddrinfo(res);
                }
        }
}

static int
prefix(void *val, int size)
{
        u_char *name = (u_char *)val;
        int byte, bit, plen = 0;

        for (byte = 0; byte < size; byte++, plen += 8)
                if (name[byte] != 0xff)
                        break;
        if (byte == size)
                return (plen);
        for (bit = 7; bit != 0; bit--, plen++)
                if (!(name[byte] & (1 << bit)))
                        break;
        for (; bit != 0; bit--)
                if (name[byte] & (1 << bit))
                        return(0);
        byte++;
        for (; byte < size; byte++)
                if (name[byte])
                        return(0);
        return (plen);
}
#endif

static char *
sec2str(time_t total)
{
        static char result[256];
        int days, hours, mins, secs;
        int first = 1;
        char *p = result;

        if (0) {
                days = total / 3600 / 24;
                hours = (total / 3600) % 24;
                mins = (total / 60) % 60;
                secs = total % 60;

                if (days) {
                        first = 0;
                        p += sprintf(p, "%dd", days);
                }
                if (!first || hours) {
                        first = 0;
                        p += sprintf(p, "%dh", hours);
                }
                if (!first || mins) {
                        first = 0;
                        p += sprintf(p, "%dm", mins);
                }
                sprintf(p, "%ds", secs);
        } else
                sprintf(result, "%lu", (unsigned long)total);

        return(result);
}

static void
in6_postproc(if_ctx *ctx, int newaddr __unused,
    int ifflags __unused)
{
        if (explicit_prefix == 0) {
                /* Aggregatable address architecture defines all prefixes
                   are 64. So, it is convenient to set prefixlen to 64 if
                   it is not specified. */
                setifprefixlen(ctx, "64", 0);
                /* in6_getprefix("64", MASK) if MASK is available here... */
        }
}

static void
in6_status_tunnel(if_ctx *ctx)
{
        char src[NI_MAXHOST];
        char dst[NI_MAXHOST];
        struct in6_ifreq in6_ifr;
        const struct sockaddr *sa = (const struct sockaddr *) &in6_ifr.ifr_addr;

        memset(&in6_ifr, 0, sizeof(in6_ifr));
        strlcpy(in6_ifr.ifr_name, ctx->ifname, sizeof(in6_ifr.ifr_name));

        if (ioctl_ctx(ctx, SIOCGIFPSRCADDR_IN6, (caddr_t)&in6_ifr) < 0)
                return;
        if (sa->sa_family != AF_INET6)
                return;
        if (getnameinfo(sa, sa->sa_len, src, sizeof(src), 0, 0,
            NI_NUMERICHOST) != 0)
                src[0] = '\0';

        if (ioctl_ctx(ctx, SIOCGIFPDSTADDR_IN6, (caddr_t)&in6_ifr) < 0)
                return;
        if (sa->sa_family != AF_INET6)
                return;
        if (getnameinfo(sa, sa->sa_len, dst, sizeof(dst), 0, 0,
            NI_NUMERICHOST) != 0)
                dst[0] = '\0';

        printf("\ttunnel inet6 %s --> %s\n", src, dst);
}

static void
in6_set_tunnel(if_ctx *ctx, struct addrinfo *srcres, struct addrinfo *dstres)
{
        struct in6_aliasreq in6_req = {}; 

        strlcpy(in6_req.ifra_name, ctx->ifname, sizeof(in6_req.ifra_name));
        memcpy(&in6_req.ifra_addr, srcres->ai_addr, srcres->ai_addr->sa_len);
        memcpy(&in6_req.ifra_dstaddr, dstres->ai_addr,
            dstres->ai_addr->sa_len);

        if (ioctl_ctx(ctx, SIOCSIFPHYADDR_IN6, &in6_req) < 0)
                warn("SIOCSIFPHYADDR_IN6");
}

static void
in6_set_vhid(int vhid)
{
#ifdef WITHOUT_NETLINK
        in6_addreq.ifra_vhid = vhid;
#else
        in6_add.vhid = (uint32_t)vhid;
#endif
}

static struct cmd inet6_cmds[] = {
        DEF_CMD_ARG("prefixlen",                        setifprefixlen),
        DEF_CMD("anycast",      IN6_IFF_ANYCAST,        setip6flags),
        DEF_CMD("tentative",    IN6_IFF_TENTATIVE,      setip6flags),
        DEF_CMD("-tentative",   -IN6_IFF_TENTATIVE,     setip6flags),
        DEF_CMD("deprecated",   IN6_IFF_DEPRECATED,     setip6flags),
        DEF_CMD("-deprecated", -IN6_IFF_DEPRECATED,     setip6flags),
        DEF_CMD("autoconf",     IN6_IFF_AUTOCONF,       setip6flags),
        DEF_CMD("-autoconf",    -IN6_IFF_AUTOCONF,      setip6flags),
        DEF_CMD("prefer_source",IN6_IFF_PREFER_SOURCE,  setip6flags),
        DEF_CMD("-prefer_source",-IN6_IFF_PREFER_SOURCE,setip6flags),
        DEF_CMD("accept_rtadv", ND6_IFF_ACCEPT_RTADV,   setnd6flags),
        DEF_CMD("-accept_rtadv",-ND6_IFF_ACCEPT_RTADV,  setnd6flags),
        DEF_CMD("no_radr",      ND6_IFF_NO_RADR,        setnd6flags),
        DEF_CMD("-no_radr",     -ND6_IFF_NO_RADR,       setnd6flags),
        DEF_CMD("defaultif",    1,                      setnd6defif),
        DEF_CMD("-defaultif",   -1,                     setnd6defif),
        DEF_CMD("ifdisabled",   ND6_IFF_IFDISABLED,     setnd6flags),
        DEF_CMD("-ifdisabled",  -ND6_IFF_IFDISABLED,    setnd6flags),
        DEF_CMD("nud",          ND6_IFF_PERFORMNUD,     setnd6flags),
        DEF_CMD("-nud",         -ND6_IFF_PERFORMNUD,    setnd6flags),
        DEF_CMD("auto_linklocal",ND6_IFF_AUTO_LINKLOCAL,setnd6flags),
        DEF_CMD("-auto_linklocal",-ND6_IFF_AUTO_LINKLOCAL,setnd6flags),
        DEF_CMD("no_prefer_iface",ND6_IFF_NO_PREFER_IFACE,setnd6flags),
        DEF_CMD("-no_prefer_iface",-ND6_IFF_NO_PREFER_IFACE,setnd6flags),
        DEF_CMD("no_dad",       ND6_IFF_NO_DAD,         setnd6flags),
        DEF_CMD("-no_dad",      -ND6_IFF_NO_DAD,        setnd6flags),
        DEF_CMD_ARG("pltime",                           setip6pltime),
        DEF_CMD_ARG("vltime",                           setip6vltime),
        DEF_CMD("eui64",        0,                      setip6eui64),
        DEF_CMD("stableaddr",   ND6_IFF_STABLEADDR,     setnd6flags),
        DEF_CMD("-stableaddr",  -ND6_IFF_STABLEADDR,    setnd6flags),
#ifdef EXPERIMENTAL
        DEF_CMD("ipv6_only",    ND6_IFF_IPV6_ONLY_MANUAL,setnd6flags),
        DEF_CMD("-ipv6_only",   -ND6_IFF_IPV6_ONLY_MANUAL,setnd6flags),
#endif
};

static struct afswtch af_inet6 = {
        .af_name        = "inet6",
        .af_af          = AF_INET6,
#ifdef WITHOUT_NETLINK
        .af_status      = in6_status,
#else
        .af_status      = in6_status_nl,
#endif
        .af_getaddr     = in6_getaddr,
        .af_copyaddr    = in6_copyaddr,
#ifdef WITHOUT_NETLINK
        .af_getprefix   = in6_getprefix,
#endif
        .af_other_status = nd6_status,
        .af_postproc    = in6_postproc,
        .af_status_tunnel = in6_status_tunnel,
        .af_settunnel   = in6_set_tunnel,
        .af_setvhid     = in6_set_vhid,
#ifdef WITHOUT_NETLINK
        .af_difaddr     = SIOCDIFADDR_IN6,
        .af_aifaddr     = SIOCAIFADDR_IN6,
        .af_ridreq      = &in6_ridreq,
        .af_addreq      = &in6_addreq,
        .af_exec        = af_exec_ioctl,
#else
        .af_difaddr     = NL_RTM_DELADDR,
        .af_aifaddr     = NL_RTM_NEWADDR,
        .af_ridreq      = &in6_del,
        .af_addreq      = &in6_add,
        .af_exec        = in6_exec_nl,
#endif
};

static void
in6_Lopt_cb(const char *arg __unused)
{
        ip6lifetime++;  /* print IPv6 address lifetime */
}
static struct option in6_Lopt = {
        .opt = "L",
        .opt_usage = "[-L]",
        .cb = in6_Lopt_cb
};

static __constructor void
inet6_ctor(void)
{
        size_t i;

#ifndef RESCUE
        if (!feature_present("inet6"))
                return;
#endif

        for (i = 0; i < nitems(inet6_cmds);  i++)
                cmd_register(&inet6_cmds[i]);
        af_register(&af_inet6);
        opt_register(&in6_Lopt);
}