Merge remote-tracking branch 'origin/master'

[unleashed/lotheac.git] / usr / src / cmd / cmd-inet / usr.bin / pppd / sys-solaris.c

/*
 * System-dependent procedures for pppd under Solaris 2.x (SunOS 5.x).
 *
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, provided that the above copyright
 * notice appears in all copies.
 *
 * SUN MAKES NO REPRESENTATION OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT.  SUN SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES
 *
 * Copyright (c) 1994 The Australian National University.
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, provided that the above copyright
 * notice appears in all copies.  This software is provided without any
 * warranty, express or implied. The Australian National University
 * makes no representations about the suitability of this software for
 * any purpose.
 *
 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 * THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
 * OR MODIFICATIONS.
 */

#include <limits.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <netdb.h>
#include <termios.h>
#include <signal.h>
#include <string.h>
#include <stropts.h>
#include <utmpx.h>
#include <sys/types.h>
#include <sys/ioccom.h>
#include <sys/stream.h>
#include <sys/stropts.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysmacros.h>
#include <sys/systeminfo.h>
#include <sys/stat.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/route.h>
#include <net/ppp_defs.h>
#include <net/pppio.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <netinet/in.h>
#include <sys/tihdr.h>
#include <inet/mib2.h>
#include <inet/ip.h>
#include <sys/ethernet.h>
#include <sys/ser_sync.h>
#include <libdlpi.h>
#include <arpa/inet.h>

#include "pppd.h"
#include "fsm.h"
#include "lcp.h"
#include "ipcp.h"
#ifdef INET6
#include "ipv6cp.h"
#endif /* INET6 */
#include "ccp.h"

#define PPPSTRTIMOUT    1       /* Timeout in seconds for ioctl */
#define MAX_POLLFDS     32
#define NMODULES        32

#ifndef MAXIFS
#define MAXIFS          256
#endif /* MAXIFS */

#ifdef INET6
#define _IN6_LLX_FROM_EUI64(l, s, eui64, as, len)       \
        (s->sin6_addr.s6_addr32[0] = htonl(as),         \
        eui64_copy(eui64, s->sin6_addr.s6_addr32[2]),   \
        s->sin6_family = AF_INET6,                      \
        l.lifr_addr.ss_family = AF_INET6,               \
        l.lifr_addrlen = len,                           \
        l.lifr_addr = laddr)

/*
 * Generate a link-local address with an interface-id based on the given
 * EUI64 identifier.  Note that the len field is unused by SIOCSLIFADDR.
 */
#define IN6_LLADDR_FROM_EUI64(l, s, eui64)              \
        _IN6_LLX_FROM_EUI64(l, s, eui64, 0xfe800000, 0)

/*
 * Generate an EUI64 based interface-id for use by stateless address
 * autoconfiguration.  These are required to be 64 bits long as defined in
 * the "Interface Identifiers" section of the IPv6 Addressing Architecture
 * (RFC3513).
 */
#define IN6_LLTOKEN_FROM_EUI64(l, s, eui64) \
        _IN6_LLX_FROM_EUI64(l, s, eui64, 0, 64)
#endif /* INET6 */

#define IPCP_ENABLED    ipcp_protent.enabled_flag
#ifdef INET6
#define IPV6CP_ENABLED  ipv6cp_protent.enabled_flag
#endif /* INET6 */

/* For plug-in usage. */
int (*sys_read_packet_hook) __P((int retv, struct strbuf *ctrl,
    struct strbuf *data, int flags)) = NULL;
bool already_ppp = 0;                   /* Already in PPP mode */

static int pppfd = -1;                  /* ppp driver fd */
static int fdmuxid = -1;                /* driver mux fd */
static int ipfd = -1;                   /* IPv4 fd */
static int ipmuxid = -1;                /* IPv4 mux fd */
static int ip6fd = -1;                  /* IPv6 fd */
static int ip6muxid = -1;               /* IPv6 mux fd */
static bool if6_is_up = 0;              /* IPv6 if marked as up */
static bool if_is_up = 0;               /* IPv4 if marked as up */
static bool restore_term = 0;           /* Restore TTY after closing link */
static struct termios inittermios;      /* TTY settings */
static struct winsize wsinfo;           /* Initial window size info */
static pid_t tty_sid;                   /* original sess ID for term */
static struct pollfd pollfds[MAX_POLLFDS]; /* array of polled fd */
static int n_pollfds = 0;               /* total count of polled fd */
static int link_mtu;                    /* link Maximum Transmit Unit */
static int tty_nmodules;                /* total count of TTY modules used */
static char tty_modules[NMODULES][FMNAMESZ+1];
                                        /* array of TTY modules used */
static int tty_npushed;                 /* total count of pushed PPP modules */
static u_int32_t remote_addr;           /* IP address of peer */
static u_int32_t default_route_gateway; /* Gateway for default route */
static u_int32_t proxy_arp_addr;        /* Addr for proxy arp entry */
static u_int32_t lastlink_status;       /* Last link status info */

static bool use_plink = 0;              /* Use I_LINK by default */
static bool plumbed = 0;                /* Use existing interface */

/* Default is to use /dev/sppp as driver. */
static const char *drvnam = PPP_DEV_NAME;
static bool integrated_driver = 0;
static int extra_dev_fd = -1;           /* keep open until ready */

static option_t solaris_option_list[] = {
        { "plink", o_bool, &use_plink, "Use I_PLINK instead of I_LINK",
            OPT_PRIV|1 },
        { "noplink", o_bool, &use_plink, "Use I_LINK instead of I_PLINK",
            OPT_PRIV|0 },
        { "plumbed", o_bool, &plumbed, "Use pre-plumbed interface",
            OPT_PRIV|1 },
        { NULL }
};

/*
 * Prototypes for procedures local to this file.
 */
static int translate_speed __P((int));
static int baud_rate_of __P((int));
static int get_ether_addr __P((u_int32_t, struct sockaddr_dl *, int));
static int strioctl __P((int, int, void *, int, int));
static int plumb_ipif __P((int));
static int unplumb_ipif __P((int));
#ifdef INET6
static int plumb_ip6if __P((int));
static int unplumb_ip6if __P((int));
static int open_ip6fd(void);
#endif /* INET6 */
static int open_ipfd(void);
static int sifroute __P((int, u_int32_t, u_int32_t, int, const char *));
static int giflags __P((u_int32_t, bool *));
static void handle_unbind __P((u_int32_t));
static void handle_bind __P((u_int32_t));

/*
 * Wrapper for regular ioctl; masks out EINTR.
 */
static int
myioctl(int fd, int cmd, void *arg)
{
        int retv;

        errno = 0;
        while ((retv = ioctl(fd, cmd, arg)) == -1) {
                if (errno != EINTR)
                        break;
        }
        return (retv);
}

/*
 * sys_check_options()
 *
 * Check the options that the user specified.
 */
int
sys_check_options(void)
{
        if (plumbed) {
                if (req_unit == -1)
                        req_unit = -2;
                ipmuxid = 0;
                ip6muxid = 0;
        }
        return (1);
}

/*
 * sys_options()
 *
 * Add or remove system-specific options.
 */
void
sys_options(void)
{
        (void) remove_option("ktune");
        (void) remove_option("noktune");
        add_options(solaris_option_list);
}

/*
 * sys_ifname()
 *
 * Set ifname[] to contain name of IP interface for this unit.
 */
void
sys_ifname(void)
{
        const char *cp;

        if ((cp = strrchr(drvnam, '/')) == NULL)
                cp = drvnam;
        else
                cp++;
        (void) slprintf(ifname, sizeof (ifname), "%s%d", cp, ifunit);
}

/*
 * ppp_available()
 *
 * Check whether the system has any ppp interfaces.
 */
int
ppp_available(void)
{
        struct stat buf;
        int fd;
        uint32_t typ;

        if (stat(PPP_DEV_NAME, &buf) >= 0)
                return (1);

        /*
         * Simple check for system using Apollo POS without SUNWpppd
         * (/dev/sppp) installed.  This is intentionally not kept open
         * here, since the user may not have the same privileges (as
         * determined later).  If Apollo were just shipped with the
         * full complement of packages, this wouldn't be an issue.
         */
        if (devnam[0] == '\0' &&
            (fd = open(devnam, O_RDWR | O_NONBLOCK | O_NOCTTY)) >= 0) {
                if (strioctl(fd, PPPIO_GTYPE, &typ, 0, sizeof (typ)) >= 0 &&
                    typ == PPPTYP_MUX) {
                        (void) close(fd);
                        return (1);
                }
                (void) close(fd);
        }
        return (0);
}

static int
open_ipfd(void)
{
        ipfd = open(IP_DEV_NAME, O_RDWR | O_NONBLOCK, 0);
        if (ipfd < 0) {
                error("Couldn't open IP device (%s): %m", IP_DEV_NAME);
        }
        return (ipfd);
}

static int
read_ip_interface(int unit)
{
        struct ifreq ifr;
        struct sockaddr_in sin;

        if (ipfd == -1 && open_ipfd() == -1)
                return (0);

        BZERO(&ifr, sizeof (ifr));
        (void) strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));

        /* Get the existing MTU */
        if (myioctl(ipfd, SIOCGIFMTU, &ifr) < 0) {
                warn("Couldn't get IP MTU on %s: %m", ifr.ifr_name);
                return (0);
        }
        dbglog("got MTU %d from interface", ifr.ifr_metric);
        if (ifr.ifr_metric != 0 &&
            (lcp_allowoptions[unit].mru == 0 ||
            lcp_allowoptions[unit].mru > ifr.ifr_metric))
                lcp_allowoptions[unit].mru = ifr.ifr_metric;

        /* Get the local IP address */
        if (ipcp_wantoptions[unit].ouraddr == 0 ||
            ipcp_from_hostname) {
                if (myioctl(ipfd, SIOCGIFADDR, &ifr) < 0) {
                        warn("Couldn't get local IP address (%s): %m",
                            ifr.ifr_name);
                        return (0);
                }
                BCOPY(&ifr.ifr_addr, &sin, sizeof (struct sockaddr_in));
                ipcp_wantoptions[unit].ouraddr = sin.sin_addr.s_addr;
                dbglog("got local address %I from interface",
                    ipcp_wantoptions[unit].ouraddr);
        }

        /* Get the remote IP address */
        if (ipcp_wantoptions[unit].hisaddr == 0) {
                if (myioctl(ipfd, SIOCGIFDSTADDR, &ifr) < 0) {
                        warn("Couldn't get remote IP address (%s): %m",
                            ifr.ifr_name);
                        return (0);
                }
                BCOPY(&ifr.ifr_dstaddr, &sin, sizeof (struct sockaddr_in));
                ipcp_wantoptions[unit].hisaddr = sin.sin_addr.s_addr;
                dbglog("got remote address %I from interface",
                    ipcp_wantoptions[unit].hisaddr);
        }
        return (1);
}

#ifdef INET6
static int
open_ip6fd(void)
{
        ip6fd = open(IP6_DEV_NAME, O_RDWR | O_NONBLOCK, 0);
        if (ip6fd < 0) {
                error("Couldn't open IPv6 device (%s): %m", IP6_DEV_NAME);
        }
        return (ip6fd);
}

static int
read_ipv6_interface(int unit)
{
        struct lifreq lifr;
        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&lifr.lifr_addr;

        if (ip6fd == -1 && open_ip6fd() == -1)
                return (0);

        BZERO(&lifr, sizeof (lifr));
        (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));

        /* Get the existing MTU */
        if (myioctl(ip6fd, SIOCGLIFMTU, &lifr) < 0) {
                warn("Couldn't get IPv6 MTU on %s: %m", lifr.lifr_name);
                return (0);
        }
        if (lifr.lifr_mtu != 0 &&
            (lcp_allowoptions[unit].mru == 0 ||
            lcp_allowoptions[unit].mru > lifr.lifr_mtu))
                lcp_allowoptions[unit].mru = lifr.lifr_mtu;

        /* Get the local IPv6 address */
        if (eui64_iszero(ipv6cp_wantoptions[unit].ourid) ||
            (ipcp_from_hostname && ipv6cp_wantoptions[unit].use_ip)) {
                if (myioctl(ip6fd, SIOCGLIFADDR, &lifr) < 0) {
                        warn("Couldn't get local IPv6 address (%s): %m",
                            lifr.lifr_name);
                        return (0);
                }
                eui64_copy(sin6->sin6_addr.s6_addr32[2],
                    ipv6cp_wantoptions[unit].ourid);
        }

        /* Get the remote IP address */
        if (eui64_iszero(ipv6cp_wantoptions[unit].hisid)) {
                if (myioctl(ip6fd, SIOCGLIFDSTADDR, &lifr) < 0) {
                        warn("Couldn't get remote IPv6 address (%s): %m",
                            lifr.lifr_name);
                        return (0);
                }
                eui64_copy(sin6->sin6_addr.s6_addr32[2],
                    ipv6cp_wantoptions[unit].hisid);
        }
        return (1);
}
#endif /* INET6 */

/*
 * Read information on existing interface(s) and configure ourselves
 * to negotiate appropriately.
 */
static void
read_interface(int unit)
{
        dbglog("reading existing interface data; %sip %sipv6",
            IPCP_ENABLED ? "" : "!",
#ifdef INET6
            IPV6CP_ENABLED ? "" :
#endif
            "!");
        if (IPCP_ENABLED && !read_ip_interface(unit))
                IPCP_ENABLED = 0;
#ifdef INET6
        if (IPV6CP_ENABLED && !read_ipv6_interface(unit))
                IPV6CP_ENABLED = 0;
#endif
}

/*
 * sys_init()
 *
 * System-dependent initialization.
 */
void
sys_init(bool open_as_user)
{
        uint32_t x;
        uint32_t typ;

        if (pppfd != -1) {
                return;
        }

        if (!direct_tty && devnam[0] != '\0') {
                /*
                 * Check for integrated driver-like devices (such as
                 * POS).  These identify themselves as "PPP
                 * multiplexor" drivers.
                 */
                if (open_as_user)
                        (void) seteuid(getuid());
                pppfd = open(devnam, O_RDWR | O_NONBLOCK);
                if (open_as_user)
                        (void) seteuid(0);
                if (pppfd >= 0 &&
                    strioctl(pppfd, PPPIO_GTYPE, &typ, 0, sizeof (typ)) >= 0 &&
                    typ == PPPTYP_MUX) {
                        integrated_driver = 1;
                        drvnam = devnam;
                } else if (demand) {
                        (void) close(pppfd);
                        pppfd = -1;
                } else {
                        extra_dev_fd = pppfd;
                        pppfd = -1;
                }
        }

        /*
         * Open Solaris PPP device driver.
         */
        if (pppfd < 0)
                pppfd = open(drvnam, O_RDWR | O_NONBLOCK);
        if (pppfd < 0) {
                fatal("Can't open %s: %m", drvnam);
        }
        if (kdebugflag & 1) {
                x = PPPDBG_LOG + PPPDBG_DRIVER;
                if (strioctl(pppfd, PPPIO_DEBUG, &x, sizeof (x), 0) < 0) {
                        warn("PPPIO_DEBUG ioctl for mux failed: %m");
                }
        }
        /*
         * Assign a new PPA and get its unit number.
         */
        x = req_unit;
        if (strioctl(pppfd, PPPIO_NEWPPA, &x, sizeof (x), sizeof (x)) < 0) {
                if (errno == ENXIO && plumbed)
                        fatal("No idle interfaces available for use");
                fatal("PPPIO_NEWPPA ioctl failed: %m");
        }
        ifunit = x;
        if (req_unit >= 0 && ifunit != req_unit) {
                if (plumbed)
                        fatal("unable to get requested unit %d", req_unit);
                else
                        warn("unable to get requested unit %d", req_unit);
        }
        /*
         * Enable packet time-stamping when idle option is specified. Note
         * that we need to only do this on the control stream. Subsequent
         * streams attached to this control stream (ppa) will inherit
         * the time-stamp bit.
         */
        if (idle_time_limit > 0) {
                if (strioctl(pppfd, PPPIO_USETIMESTAMP, NULL, 0, 0) < 0) {
                        warn("PPPIO_USETIMESTAMP ioctl failed: %m");
                }
        }
        if (plumbed) {
                sys_ifname();
                read_interface(0);
        }
}

int
sys_extra_fd(void)
{
        int fd;

        fd = extra_dev_fd;
        extra_dev_fd = -1;
        return (fd);
}

static int
open_udpfd(void)
{
        int udpfd;

        udpfd = open(UDP_DEV_NAME, O_RDWR | O_NONBLOCK, 0);
        if (udpfd < 0) {
                error("Couldn't open UDP device (%s): %m", UDP_DEV_NAME);
        }
        return (udpfd);
}

/*
 * plumb_ipif()
 *
 * Perform IP interface plumbing.
 */
/*ARGSUSED*/
static int
plumb_ipif(int unit)
{
        int udpfd = -1, tmpfd;
        uint32_t x;
        struct ifreq ifr;

        if (!IPCP_ENABLED || (ifunit == -1) || (pppfd == -1)) {
                return (0);
        }
        if (plumbed)
                return (1);
        if (ipfd == -1 && open_ipfd() == -1)
                return (0);
        if (use_plink && (udpfd = open_udpfd()) == -1)
                return (0);
        tmpfd = open(drvnam, O_RDWR | O_NONBLOCK, 0);
        if (tmpfd < 0) {
                error("Couldn't open PPP device (%s): %m", drvnam);
                if (udpfd != -1)
                        (void) close(udpfd);
                return (0);
        }
        if (kdebugflag & 1) {
                x = PPPDBG_LOG + PPPDBG_DRIVER;
                if (strioctl(tmpfd, PPPIO_DEBUG, &x, sizeof (x), 0) < 0) {
                        warn("PPPIO_DEBUG ioctl for mux failed: %m");
                }
        }
        if (myioctl(tmpfd, I_PUSH, IP_MOD_NAME) < 0) {
                error("Couldn't push IP module (%s): %m", IP_MOD_NAME);
                goto err_ret;
        }
        /*
         * Assign ppa according to the unit number returned by ppp device
         * after plumbing is completed above.  Without setting the ppa, ip
         * module will return EINVAL upon setting the interface UP
         * (SIOCSxIFFLAGS).  This is because ip module in 2.8 expects two
         * DLPI_INFO_REQ to be sent down to the driver (below ip) before
         * IFF_UP bit can be set. Plumbing the device causes one DLPI_INFO_REQ
         * to be sent down, and the second DLPI_INFO_REQ is sent upon receiving
         * IF_UNITSEL (old) or SIOCSLIFNAME (new) ioctls. Such setting of the
         * ppa is required because the ppp DLPI provider advertises itself as
         * a DLPI style 2 type, which requires a point of attachment to be
         * specified. The only way the user can specify a point of attachment
         * is via SIOCSLIFNAME or IF_UNITSEL.  Such changes in the behavior of
         * ip module was made to meet new or evolving standards requirements.
         */
        if (myioctl(tmpfd, IF_UNITSEL, &ifunit) < 0) {
                error("Couldn't set ppa for unit %d: %m", ifunit);
                goto err_ret;
        }
        if (use_plink) {
                ipmuxid = myioctl(udpfd, I_PLINK, (void *)tmpfd);
                if (ipmuxid < 0) {
                        error("Can't I_PLINK PPP device to IP: %m");
                        goto err_ret;
                }
        } else {
                ipmuxid = myioctl(ipfd, I_LINK, (void *)tmpfd);
                if (ipmuxid < 0) {
                        error("Can't I_LINK PPP device to IP: %m");
                        goto err_ret;
                }
        }
        BZERO(&ifr, sizeof (ifr));
        (void) strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
        ifr.ifr_ip_muxid = ipmuxid;
        ifr.ifr_arp_muxid = -1;
        if (myioctl(ipfd, SIOCSIFMUXID, (caddr_t)&ifr) < 0) {
                error("Can't set mux ID SIOCSIFMUXID on %s: %m", ifname);
                goto err_ret;
        }
        if (udpfd != -1)
                (void) close(udpfd);
        (void) close(tmpfd);
        return (1);
err_ret:
        if (udpfd != -1)
                (void) close(udpfd);
        (void) close(tmpfd);
        return (0);
}

/*
 * unplumb_ipif()
 *
 * Perform IP interface unplumbing.  Possibly called from die(), so there
 * shouldn't be any call to die() or fatal() here.
 */
static int
unplumb_ipif(int unit)
{
        int udpfd = -1, fd = -1;
        int id;
        struct lifreq lifr;

        if (!IPCP_ENABLED || (ifunit == -1)) {
                return (0);
        }
        if (!plumbed && (ipmuxid == -1 || (ipfd == -1 && !use_plink)))
                return (1);
        id = ipmuxid;
        if (!plumbed && use_plink) {
                if ((udpfd = open_udpfd()) == -1)
                        return (0);
                /*
                 * Note: must re-get mux ID, since any intervening
                 * ifconfigs will change this.
                 */
                BZERO(&lifr, sizeof (lifr));
                (void) strlcpy(lifr.lifr_name, ifname,
                    sizeof (lifr.lifr_name));
                if (myioctl(ipfd, SIOCGLIFMUXID, (caddr_t)&lifr) < 0) {
                        warn("Can't get mux fd: SIOCGLIFMUXID: %m");
                } else {
                        id = lifr.lifr_ip_muxid;
                        fd = myioctl(udpfd, _I_MUXID2FD, (void *)id);
                        if (fd < 0) {
                                warn("Can't get mux fd: _I_MUXID2FD: %m");
                        }
                }
        }
        /*
         * Mark down and unlink the ip interface.
         */
        (void) sifdown(unit);
        if (default_route_gateway != 0) {
                (void) cifdefaultroute(0, default_route_gateway,
                    default_route_gateway);
        }
        if (proxy_arp_addr != 0) {
                (void) cifproxyarp(0, proxy_arp_addr);
        }
        ipmuxid = -1;
        if (plumbed)
                return (1);
        if (use_plink) {
                if (myioctl(udpfd, I_PUNLINK, (void *)id) < 0) {
                        error("Can't I_PUNLINK PPP from IP: %m");
                        if (fd != -1)
                                (void) close(fd);
                        (void) close(udpfd);
                        return (0);
                }
                if (fd != -1)
                        (void) close(fd);
                (void) close(udpfd);
        } else {
                if (myioctl(ipfd, I_UNLINK, (void *)id) < 0) {
                        error("Can't I_UNLINK PPP from IP: %m");
                        return (0);
                }
        }
        return (1);
}

/*
 * sys_cleanup()
 *
 * Restore any system state we modified before exiting: mark the
 * interface down, delete default route and/or proxy arp entry. This
 * should not call die() because it's called from die().
 */
void
sys_cleanup()
{
        (void) unplumb_ipif(0);
#ifdef INET6
        (void) unplumb_ip6if(0);
#endif /* INET6 */
}

/*
 * get_first_hwaddr()
 *
 * Stores the first hardware interface address found in the system
 * into addr and return 1 upon success, or 0 if none is found.  This
 * is also called from the multilink code.
 */
int
get_first_hwaddr(addr, msize)
        uchar_t *addr;
        int msize;
{
        struct ifconf ifc;
        register struct ifreq *pifreq;
        struct ifreq ifr;
        int fd, num_ifs, i;
        uint_t fl, req_size;
        char *req;
        boolean_t found;

        if (addr == NULL) {
                return (0);
        }
        fd = socket(AF_INET, SOCK_DGRAM, 0);
        if (fd < 0) {
                error("get_first_hwaddr: error opening IP socket: %m");
                return (0);
        }
        /*
         * Find out how many interfaces are running
         */
        if (myioctl(fd, SIOCGIFNUM, (caddr_t)&num_ifs) < 0) {
                num_ifs = MAXIFS;
        }
        req_size = num_ifs * sizeof (struct ifreq);
        req = malloc(req_size);
        if (req == NULL) {
                novm("interface request structure.");
        }
        /*
         * Get interface configuration info for all interfaces
         */
        ifc.ifc_len = req_size;
        ifc.ifc_buf = req;
        if (myioctl(fd, SIOCGIFCONF, &ifc) < 0) {
                error("SIOCGIFCONF: %m");
                (void) close(fd);
                free(req);
                return (0);
        }
        /*
         * And traverse each interface to look specifically for the first
         * occurence of an Ethernet interface which has been marked up
         */
        pifreq = ifc.ifc_req;
        found = 0;
        for (i = ifc.ifc_len / sizeof (struct ifreq); i > 0; i--, pifreq++) {

                if (strchr(pifreq->ifr_name, ':') != NULL) {
                        continue;
                }
                BZERO(&ifr, sizeof (ifr));
                (void) strncpy(ifr.ifr_name, pifreq->ifr_name,
                    sizeof (ifr.ifr_name));
                if (myioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
                        continue;
                }
                fl = ifr.ifr_flags;
                if ((fl & (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|IFF_LOOPBACK))
                    != (IFF_UP | IFF_BROADCAST)) {
                        continue;
                }
                if (get_if_hwaddr(addr, msize, ifr.ifr_name) <= 0) {
                        continue;
                }
                found = 1;
                break;
        }
        free(req);
        (void) close(fd);

        return (found);
}

/*
 * get_if_hwaddr()
 *
 * Get the hardware address for the specified network interface device.
 * Return the length of the MAC address (in bytes) or -1 if error.
 */
int
get_if_hwaddr(uchar_t *addrp, int msize, char *linkname)
{
        dlpi_handle_t dh;
        uchar_t physaddr[DLPI_PHYSADDR_MAX];
        size_t physaddrlen = sizeof (physaddr);
        int retv;

        if ((addrp == NULL) || (linkname == NULL))
                return (-1);

        /*
         * Open the link and ask for hardware address.
         */
        if ((retv = dlpi_open(linkname, &dh, 0)) != DLPI_SUCCESS) {
                error("Could not open %s: %s", linkname, dlpi_strerror(retv));
                return (-1);
        }

        retv = dlpi_get_physaddr(dh, DL_CURR_PHYS_ADDR,
            physaddr, &physaddrlen);
        dlpi_close(dh);
        if (retv != DLPI_SUCCESS) {
                error("Could not get physical address on %s: %s", linkname,
                    dlpi_strerror(retv));
                return (-1);
        }

        /*
         * Check if we have enough space to copy the address to.
         */
        if (physaddrlen > msize)
                return (-1);
        (void) memcpy(addrp, physaddr, physaddrlen);
        return (physaddrlen);
}

/*
 * giflags()
 */
static int
giflags(u_int32_t flag, bool *retval)
{
        struct ifreq ifr;
        int fd;

        *retval = 0;
        fd = socket(AF_INET, SOCK_DGRAM, 0);
        if (fd < 0) {
                error("giflags: error opening IP socket: %m");
                return (errno);
        }

        BZERO(&ifr, sizeof (ifr));
        (void) strncpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
        if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
                (void) close(fd);
                return (errno);
        }

        *retval = ((ifr.ifr_flags & flag) != 0);
        (void) close(fd);
        return (errno);
}

/*
 * sys_close()
 *
 * Clean up in a child process before exec-ing.
 */
void
sys_close()
{
        if (ipfd != -1) {
                (void) close(ipfd);
                ipfd = -1;
        }
#ifdef INET6
        if (ip6fd != -1) {
                (void) close(ip6fd);
                ip6fd = -1;
        }
#endif /* INET6 */
        if (pppfd != -1) {
                (void) close(pppfd);
                pppfd = -1;
        }
}

/*
 * any_compressions()
 *
 * Check if compression is enabled or not.  In the STREAMS implementation of
 * kernel-portion pppd, the comp STREAMS module performs the ACFC, PFC, as
 * well CCP and VJ compressions. However, if the user has explicitly declare
 * to not enable them from the command line, there is no point of having the
 * comp module be pushed on the stream.
 */
static int
any_compressions(void)
{
        if ((!lcp_wantoptions[0].neg_accompression) &&
            (!lcp_wantoptions[0].neg_pcompression) &&
            (!ccp_protent.enabled_flag) &&
            (!ipcp_wantoptions[0].neg_vj)) {
                return (0);
        }
        return (1);
}

/*
 * modpush()
 *
 * Push a module on the stream.
 */
static int
modpush(int fd, const char *modname, const char *text)
{
        if (myioctl(fd, I_PUSH, (void *)modname) < 0) {
                error("Couldn't push %s module: %m", text);
                return (-1);
        }
        if (++tty_npushed == 1 && !already_ppp) {
                if (strioctl(fd, PPPIO_LASTMOD, NULL, 0, 0) < 0) {
                        warn("unable to set LASTMOD on %s: %m", text);
                }
        }
        return (0);
}

/*
 * establish_ppp()
 *
 * Turn the serial port into a ppp interface.
 */
int
establish_ppp(fd)
        int fd;
{
        int i;
        uint32_t x;

        if (default_device && !notty) {
                tty_sid = getsid((pid_t)0);
        }

        if (integrated_driver)
                return (pppfd);

        /*
         * Pop any existing modules off the tty stream
         */
        for (i = 0; ; ++i) {
                if ((myioctl(fd, I_LOOK, tty_modules[i]) < 0) ||
                    (strcmp(tty_modules[i], "ptem") == 0) ||
                    (myioctl(fd, I_POP, NULL) < 0)) {
                        break;
                }
        }
        tty_nmodules = i;
        /*
         * Push the async hdlc module and the compressor module
         */
        tty_npushed = 0;
        if (!sync_serial && !already_ppp &&
            modpush(fd, AHDLC_MOD_NAME, "PPP async HDLC") < 0) {
                return (-1);
        }
        /*
         * There's no need to push comp module if we don't intend
         * to compress anything
         */
        if (any_compressions()) {
                (void) modpush(fd, COMP_MOD_NAME, "PPP compression");
        }

        /*
         * Link the serial port under the PPP multiplexor
         */
        if ((fdmuxid = myioctl(pppfd, I_LINK, (void *)fd)) < 0) {
                error("Can't link tty to PPP mux: %m");
                return (-1);
        }
        if (tty_npushed == 0 && !already_ppp) {
                if (strioctl(pppfd, PPPIO_LASTMOD, NULL, 0, 0) < 0) {
                        warn("unable to set LASTMOD on PPP mux: %m");
                }
        }
        /*
         * Debug configuration must occur *after* I_LINK.
         */
        if (kdebugflag & 4) {
                x = PPPDBG_LOG + PPPDBG_AHDLC;
                if (strioctl(pppfd, PPPIO_DEBUG, &x, sizeof (x), 0) < 0) {
                        warn("PPPIO_DEBUG ioctl for ahdlc module failed: %m");
                }
        }
        if (any_compressions() && (kdebugflag & 2)) {
                x = PPPDBG_LOG + PPPDBG_COMP;
                if (strioctl(pppfd, PPPIO_DEBUG, &x, sizeof (x), 0) < 0) {
                        warn("PPPIO_DEBUG ioctl for comp module failed: %m");
                }
        }
        return (pppfd);
}

/*
 * restore_loop()
 *
 * Reattach the ppp unit to the loopback. This doesn't need to do anything
 * because disestablish_ppp does it
 */
void
restore_loop()
{
}

/*
 * disestablish_ppp()
 *
 * Restore the serial port to normal operation.  It attempts to reconstruct
 * the stream with the previously popped modules.  This shouldn't call die()
 * because it's called from die().  Stream reconstruction is needed in case
 * pppd is used for dial-in on /dev/tty and there's an option error.
 */
void
disestablish_ppp(fd)
        int fd;
{
        int i;

        if (fdmuxid == -1 || integrated_driver) {
                return;
        }
        if (myioctl(pppfd, I_UNLINK, (void *)fdmuxid) < 0) {
                if (!hungup) {
                        error("Can't unlink tty from PPP mux: %m");
                }
        }
        fdmuxid = -1;
        if (!hungup) {
                while (tty_npushed > 0 && myioctl(fd, I_POP, NULL) >= 0) {
                        --tty_npushed;
                }
                for (i = tty_nmodules - 1; i >= 0; --i) {
                        if (myioctl(fd, I_PUSH, tty_modules[i]) < 0) {
                                error("Couldn't restore tty module %s: %m",
                                    tty_modules[i]);
                        }
                }
        }
        if (hungup && default_device && tty_sid > 0) {
                /*
                 * If we have received a hangup, we need to send a
                 * SIGHUP to the terminal's controlling process.
                 * The reason is that the original stream head for
                 * the terminal hasn't seen the M_HANGUP message
                 * (it went up through the ppp driver to the stream
                 * head for our fd to /dev/ppp).
                 */
                (void) kill(tty_sid, SIGHUP);
        }
}

/*
 * clean_check()
 *
 * Check whether the link seems not to be 8-bit clean
 */
void
clean_check()
{
        uint32_t x;
        char *s = NULL;

        /*
         * Skip this is synchronous link is used, since spppasyn won't
         * be anywhere in the stream below to handle the ioctl.
         */
        if (sync_serial) {
                return;
        }

        if (strioctl(pppfd, PPPIO_GCLEAN, &x, 0, sizeof (x)) < 0) {
                warn("unable to obtain serial link status: %m");
                return;
        }
        switch (~x) {
        case RCV_B7_0:
                s = "bit 7 set to 1";
                break;
        case RCV_B7_1:
                s = "bit 7 set to 0";
                break;
        case RCV_EVNP:
                s = "odd parity";
                break;
        case RCV_ODDP:
                s = "even parity";
                break;
        }
        if (s != NULL) {
                warn("Serial link is not 8-bit clean:");
                warn("All received characters had %s", s);
        }
}

/*
 * List of valid speeds.
 */
struct speed {
        int speed_int;
        int speed_val;
} speeds [] = {
#ifdef B50
        { 50, B50 },
#endif
#ifdef B75
        { 75, B75 },
#endif
#ifdef B110
        { 110, B110 },
#endif
#ifdef B134
        { 134, B134 },
#endif
#ifdef B150
        { 150, B150 },
#endif
#ifdef B200
        { 200, B200 },
#endif
#ifdef B300
        { 300, B300 },
#endif
#ifdef B600
        { 600, B600 },
#endif
#ifdef B1200
        { 1200, B1200 },
#endif
#ifdef B1800
        { 1800, B1800 },
#endif
#ifdef B2000
        { 2000, B2000 },
#endif
#ifdef B2400
        { 2400, B2400 },
#endif
#ifdef B3600
        { 3600, B3600 },
#endif
#ifdef B4800
        { 4800, B4800 },
#endif
#ifdef B7200
        { 7200, B7200 },
#endif
#ifdef B9600
        { 9600, B9600 },
#endif
#ifdef B19200
        { 19200, B19200 },
#endif
#ifdef B38400
        { 38400, B38400 },
#endif
#ifdef EXTA
        { 19200, EXTA },
#endif
#ifdef EXTB
        { 38400, EXTB },
#endif
#ifdef B57600
        { 57600, B57600 },
#endif
#ifdef B76800
        { 76800, B76800 },
#endif
#ifdef B115200
        { 115200, B115200 },
#endif
#ifdef B153600
        { 153600, B153600 },
#endif
#ifdef B230400
        { 230400, B230400 },
#endif
#ifdef B307200
        { 307200, B307200 },
#endif
#ifdef B460800
        { 460800, B460800 },
#endif
#ifdef B921600
        { 921600, B921600 },
#endif
        { 0, 0 }
};

/*
 * translate_speed()
 *
 * Translate from bits/second to a speed_t
 */
static int
translate_speed(int bps)
{
        struct speed *speedp;

        if (bps == 0) {
                return (0);
        }
        for (speedp = speeds; speedp->speed_int; speedp++) {
                if (bps == speedp->speed_int) {
                        return (speedp->speed_val);
                }
        }
        set_source(&speed_info);
        option_error("speed %d not supported", bps);
        return (0);
}

/*
 * baud_rate_of()
 *
 * Translate from a speed_t to bits/second
 */
static int
baud_rate_of(int speed)
{
        struct speed *speedp;

        if (speed == 0) {
                return (0);
        }
        for (speedp = speeds; speedp->speed_int; speedp++) {
                if (speed == speedp->speed_val) {
                        return (speedp->speed_int);
                }
        }
        return (0);
}

/*
 * set_up_tty()
 *
 * Set up the serial port on `fd' for 8 bits, no parity, at the requested
 * speed, etc.  If `local' is true, set CLOCAL regardless of whether the
 * modem option was specified.
 */
void
set_up_tty(fd, local)
        int fd, local;
{
        int speed;
        struct termios tios;
        struct scc_mode sm;

        if (already_ppp)
                return;

        if (sync_serial) {
                restore_term = 0;
                speed = B0;
                baud_rate = 0;

                if (strioctl(fd, S_IOCGETMODE, &sm, sizeof (sm),
                    sizeof (sm)) < 0) {
                        return;
                }

                baud_rate = sm.sm_baudrate;
                dbglog("synchronous speed appears to be %d bps", baud_rate);
        } else {
                if (tcgetattr(fd, &tios) < 0) {
                        fatal("tcgetattr: %m");
                }
                if (!restore_term) {
                        inittermios = tios;
                        if (myioctl(fd, TIOCGWINSZ, &wsinfo) < 0) {
                                if (errno == EINVAL) {
                                        /*
                                         * ptem returns EINVAL if all zeroes.
                                         * Strange and unfixable code.
                                         */
                                        bzero(&wsinfo, sizeof (wsinfo));
                                } else {
                                        warn("unable to get TTY window "
                                            "size: %m");
                                }
                        }
                }
                tios.c_cflag &= ~(CSIZE | CSTOPB | PARENB | CLOCAL);
                if (crtscts > 0) {
                        tios.c_cflag |= CRTSCTS | CRTSXOFF;
                } else if (crtscts < 0) {
                        tios.c_cflag &= ~CRTSCTS & ~CRTSXOFF;
                }
                tios.c_cflag |= CS8 | CREAD | HUPCL;
                if (local || !modem) {
                        tios.c_cflag |= CLOCAL;
                }
                tios.c_iflag = IGNBRK | IGNPAR;
                tios.c_oflag = 0;
                tios.c_lflag = 0;
                tios.c_cc[VMIN] = 1;
                tios.c_cc[VTIME] = 0;

                if (crtscts == -2) {
                        tios.c_iflag |= IXON | IXOFF;
                        tios.c_cc[VSTOP] = 0x13;        /* DC3 = XOFF = ^S */
                        tios.c_cc[VSTART] = 0x11;       /* DC1 = XON  = ^Q */
                }
                speed = translate_speed(inspeed);
                if (speed) {
                        (void) cfsetospeed(&tios, speed);
                        (void) cfsetispeed(&tios, speed);
                } else {
                        speed = cfgetospeed(&tios);
                        /*
                         * We can't proceed if the serial port speed is 0,
                         * since that implies that the serial port is disabled.
                         */
                        if (speed == B0) {
                                fatal("Baud rate for %s is 0; need explicit "
                                    "baud rate", devnam);
                        }
                }
                if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
                        fatal("tcsetattr: %m");
                }
                baud_rate = baud_rate_of(speed);
                dbglog("%s speed set to %d bps",
                    fd == pty_slave ? "pty" : "serial", baud_rate);
                restore_term = 1;
        }
}

/*
 * restore_tty()
 *
 * Restore the terminal to the saved settings.
 */
void
restore_tty(fd)
        int fd;
{
        if (restore_term == 0) {
                return;
        }
        if (!default_device) {
                /*
                 * Turn off echoing, because otherwise we can get into
                 * a loop with the tty and the modem echoing to each
                 * other. We presume we are the sole user of this tty
                 * device, so when we close it, it will revert to its
                 * defaults anyway.
                 */
                inittermios.c_lflag &= ~(ECHO | ECHONL);
        }
        if (tcsetattr(fd, TCSAFLUSH, &inittermios) < 0) {
                if (!hungup && errno != ENXIO) {
                        warn("tcsetattr: %m");
                }
        }
        if (wsinfo.ws_row != 0 || wsinfo.ws_col != 0 ||
            wsinfo.ws_xpixel != 0 || wsinfo.ws_ypixel != 0) {
                if (myioctl(fd, TIOCSWINSZ, &wsinfo) < 0) {
                        warn("unable to set TTY window size: %m");
                }
        }
        restore_term = 0;
}

/*
 * setdtr()
 *
 * Control the DTR line on the serial port. This is called from die(), so it
 * shouldn't call die()
 */
void
setdtr(fd, on)
        int fd, on;
{
        int modembits = TIOCM_DTR;
        if (!already_ppp &&
            myioctl(fd, (on ? TIOCMBIS : TIOCMBIC), &modembits) < 0) {
                warn("unable to set DTR line %s: %m", (on ? "ON" : "OFF"));
        }
}

/*
 * open_loopback()
 *
 * Open the device we use for getting packets in demand mode. Under Solaris 2,
 * we use our existing fd to the ppp driver.
 */
int
open_ppp_loopback()
{
        /*
         * Plumb the interface.
         */
        if (IPCP_ENABLED && (plumb_ipif(0) == 0)) {
                fatal("Unable to initialize IP interface for demand dial.");
        }
#ifdef INET6
        if (IPV6CP_ENABLED && (plumb_ip6if(0) == 0)) {
                fatal("Unable to initialize IPv6 interface for demand dial.");
        }
#endif /* INET6 */

        return (pppfd);
}

/*
 * output()
 *
 * Output PPP packet downstream
 */
/*ARGSUSED*/
void
output(unit, p, len)
        int unit;
        uchar_t *p;
        int len;
{
        struct strbuf data;
        struct pollfd pfd;
        int retries, n;
        bool sent_ok = 1;

        data.len = len;
        data.buf = (caddr_t)p;
        retries = 4;

        while (putmsg(pppfd, NULL, &data, 0) < 0) {
                if (errno == EINTR)
                        continue;
                if (--retries < 0 ||
                    (errno != EWOULDBLOCK && errno != EAGAIN)) {
                        if (errno != ENXIO) {
                                error("Couldn't send packet: %m");
                                sent_ok = 0;
                        }
                        break;
                }
                pfd.fd = pppfd;
                pfd.events = POLLOUT;
                do {
                        /* wait for up to 0.25 seconds */
                        n = poll(&pfd, 1, 250);
                } while ((n == -1) && (errno == EINTR));
        }
        if (debug && sent_ok) {
                dbglog("sent %P", p, len);
        }
}

/*
 * wait_input()
 *
 * Wait until there is data available, for the length of time specified by
 * timo (indefinite if timo is NULL).
 */
void
wait_input(timo)
        struct timeval *timo;
{
        int t;

        t = (timo == NULL ? -1 : (timo->tv_sec * 1000 + timo->tv_usec / 1000));
        if ((poll(pollfds, n_pollfds, t) < 0) && (errno != EINTR)) {
                fatal("poll: %m");
        }
}

/*
 * add_fd()
 *
 * Add an fd to the set that wait_input waits for.
 */
void
add_fd(fd)
        int fd;
{
        int n;

        if (fd < 0) {
                return;
        }
        for (n = 0; n < n_pollfds; ++n) {
                if (pollfds[n].fd == fd) {
                        return;
                }
        }
        if (n_pollfds < MAX_POLLFDS) {
                pollfds[n_pollfds].fd = fd;
                pollfds[n_pollfds].events = POLLIN | POLLPRI | POLLHUP;
                ++n_pollfds;
        } else {
                fatal("add_fd: too many inputs!");
        }
}

/*
 * remove_fd()
 *
 * Remove an fd from the set that wait_input waits for.
 */
void
remove_fd(fd)
        int fd;
{
        int n;

        for (n = 0; n < n_pollfds; ++n) {
                if (pollfds[n].fd == fd) {
                        while (++n < n_pollfds) {
                                pollfds[n-1] = pollfds[n];
                        }
                        --n_pollfds;
                        break;
                }
        }
}

static void
dump_packet(uchar_t *buf, int len)
{
        uchar_t *bp;
        int proto, offs;
        const char *cp;
        char sbuf[32];
        uint32_t src, dst;
        struct protoent *pep;
        struct in6_addr addr;
        char fromstr[INET6_ADDRSTRLEN];
        char tostr[INET6_ADDRSTRLEN];

        if (len < 4) {
                notice("strange link activity: %.*B", len, buf);
                return;
        }
        bp = buf;
        if (bp[0] == 0xFF && bp[1] == 0x03)
                bp += 2;
        proto = *bp++;
        if (!(proto & 1))
                proto = (proto << 8) + *bp++;
        len -= bp-buf;
        switch (proto) {
        case PPP_IP:
                if (len < IP_HDRLEN || get_ipv(bp) != 4 || get_iphl(bp) < 5) {
                        notice("strange IP packet activity: %16.*B", len, buf);
                        return;
                }
                src = get_ipsrc(bp);
                dst = get_ipdst(bp);
                proto = get_ipproto(bp);
                if ((pep = getprotobynumber(proto)) != NULL) {
                        cp = pep->p_name;
                } else {
                        (void) slprintf(sbuf, sizeof (sbuf), "IP proto %d",
                            proto);
                        cp = sbuf;
                }
                if ((get_ipoff(bp) & IP_OFFMASK) != 0) {
                        len -= get_iphl(bp) * 4;
                        bp += get_iphl(bp) * 4;
                        notice("%s fragment from %I->%I: %8.*B", cp, src, dst,
                            len, bp);
                } else {
                        if (len > get_iplen(bp))
                                len = get_iplen(bp);
                        len -= get_iphl(bp) * 4;
                        bp += get_iphl(bp) * 4;
                        offs = proto == IPPROTO_TCP ? (get_tcpoff(bp)*4) : 8;
                        if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
                                notice("%s data:%d %s%I:%d->%I:%d: %8.*B", cp,
                                    len-offs,
                                    proto == IPPROTO_TCP ?
                                    tcp_flag_decode(get_tcpflags(bp)) : "",
                                    src, get_sport(bp), dst, get_dport(bp),
                                    len-offs, bp+offs);
                        else
                                notice("%s %d bytes %I->%I: %8.*B", cp, len,
                                    src, dst, len, bp);
                }
                return;

        case PPP_IPV6:
                if (len < IP6_HDRLEN) {
                        notice("strange IPv6 activity: %16.*B", len, buf);
                        return;
                }
                (void) BCOPY(get_ip6src(bp), &addr, sizeof (addr));
                (void) inet_ntop(AF_INET6, &addr, fromstr, sizeof (fromstr));
                (void) BCOPY(get_ip6dst(bp), &addr, sizeof (addr));
                (void) inet_ntop(AF_INET6, &addr, tostr, sizeof (tostr));
                proto = get_ip6nh(bp);
                if (proto == IPPROTO_FRAGMENT) {
                        notice("IPv6 fragment from %s->%s", fromstr,
                            tostr);
                        return;
                }
                if ((pep = getprotobynumber(proto)) != NULL) {
                        cp = pep->p_name;
                } else {
                        (void) slprintf(sbuf, sizeof (sbuf), "IPv6 proto %d",
                            proto);
                        cp = sbuf;
                }
                len -= IP6_HDRLEN;
                bp += IP6_HDRLEN;
                offs = proto == IPPROTO_TCP ? (get_tcpoff(bp)*4) : 8;
                if (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
                        notice("%s data:%d %s[%s]%d->[%s]%d: %8.*B", cp,
                            len-offs,
                            proto == IPPROTO_TCP ?
                            tcp_flag_decode(get_tcpflags(bp)) : "",
                            fromstr, get_sport(bp), tostr, get_dport(bp),
                            len-offs, bp+offs);
                else
                        notice("%s %d bytes %s->%s: %8.*B", cp, len,
                            fromstr, tostr, len, bp);
                return;
        }
        if ((cp = protocol_name(proto)) == NULL) {
                (void) slprintf(sbuf, sizeof (sbuf), "0x#X", proto);
                cp = (const char *)sbuf;
        }
        notice("link activity: %s %16.*B", cp, len, bp);
}

/*
 * handle_bind()
 */
static void
handle_bind(u_int32_t reason)
{
        /*
         * Here we might, in the future, handle DL_BIND_REQ notifications
         * in order to close and re-open a NCP when certain interface
         * parameters (addresses, etc.) are changed via external mechanisms
         * such as through the "ifconfig" program.
         */
        switch (reason) {
        case PPP_LINKSTAT_IPV4_BOUND:
                break;
#ifdef INET6
        case PPP_LINKSTAT_IPV6_BOUND:
                break;
#endif
        default:
                error("handle_bind: unrecognized reason");
                break;
        }
}

/*
 * handle_unbind()
 */
static void
handle_unbind(u_int32_t reason)
{
        bool iff_up_isset;
        int rc;
        static const char *unplumb_str = "unplumbed";
        static const char *down_str = "downed";

        /*
         * Since the kernel driver (sppp) notifies this daemon of the
         * DLPI bind/unbind activities (for the purpose of bringing down
         * a NCP), we need to explicitly test the "actual" status of
         * the interface instance for which the notification is destined
         * from.  This is because /dev/ip performs multiple DLPI attach-
         * bind-unbind-detach during the early life of the interface,
         * and when certain interface parameters change.  A DL_UNBIND_REQ
         * coming down to the sppp driver from /dev/ip (which results in
         * our receiving of the PPP_LINKSTAT_*_UNBOUND link status message)
         * is not enough to conclude that the interface has been marked
         * DOWN (its IFF_UP bit is cleared) or is going away.  Therefore,
         * we should query /dev/ip directly, upon receiving such *_UNBOUND
         * notification, to determine whether the interface is DOWN
         * for real, and only take the necessary actions when IFF_UP
         * bit for the interface instance is actually cleared.
         */
        switch (reason) {
        case PPP_LINKSTAT_IPV4_UNBOUND:
                (void) sleep(1);
                rc = giflags(IFF_UP, &iff_up_isset);
                if (!iff_up_isset) {
                        if_is_up = 0;
                        ipmuxid = -1;
                        info("IPv4 interface %s by administrator",
                            ((rc < 0 && rc == ENXIO) ? unplumb_str : down_str));
                        fsm_close(&ipcp_fsm[0],
                            "administratively disconnected");
                }
                break;
#ifdef INET6
        case PPP_LINKSTAT_IPV6_UNBOUND:
                (void) sleep(1);
                rc = giflags(IFF_UP, &iff_up_isset);
                if (!iff_up_isset) {
                        if6_is_up = 0;
                        ip6muxid = -1;
                        info("IPv6 interface %s by administrator",
                            ((rc < 0 && rc == ENXIO) ? unplumb_str : down_str));
                        fsm_close(&ipv6cp_fsm[0],
                            "administratively disconnected");
                }
                break;
#endif
        default:
                error("handle_unbind: unrecognized reason");
                break;
        }
}

/*
 * read_packet()
 *
 * Get a PPP packet from the serial device.
 */
int
read_packet(buf)
        uchar_t *buf;
{
        struct strbuf ctrl;
        struct strbuf data;
        int flags;
        int len;
        int rc;
        struct ppp_ls *plp;
        uint32_t ctrlbuf[1536 / sizeof (uint32_t)];
        bool flushmode;

        flushmode = 0;
        for (;;) {

                data.maxlen = PPP_MRU + PPP_HDRLEN;
                data.buf = (caddr_t)buf;

                ctrl.maxlen = sizeof (ctrlbuf);
                ctrl.buf = (caddr_t)ctrlbuf;

                flags = 0;
                rc = len = getmsg(pppfd, &ctrl, &data, &flags);
                if (sys_read_packet_hook != NULL) {
                        rc = len = (*sys_read_packet_hook)(len, &ctrl, &data,
                            flags);
                }
                if (len < 0) {
                        if (errno == EAGAIN || errno == EINTR) {
                                return (-1);
                        }
                        fatal("Error reading packet: %m");
                }
                if ((data.len > 0) && (ctrl.len < 0)) {
                        /*
                         * If there's more data on stream head, keep reading
                         * but discard, since the stream is now corrupt.
                         */
                        if (rc & MOREDATA) {
                                dbglog("More data; input packet garbled");
                                flushmode = 1;
                                continue;
                        }
                        if (flushmode)
                                return (-1);
                        return (data.len);

                } else if (ctrl.len > 0) {
                        /*
                         * If there's more ctl on stream head, keep reading,
                         * but start discarding.  We can't deal with fragmented
                         * messages at all.
                         */
                        if (rc & MORECTL) {
                                dbglog("More control; stream garbled");
                                flushmode = 1;
                                continue;
                        }
                        if (flushmode)
                                return (-1);
                        if (ctrl.len < sizeof (struct ppp_ls)) {
                                warn("read_packet: ctl.len %d < "
                                    "sizeof ppp_ls %d",
                                    ctrl.len, sizeof (struct ppp_ls));
                                return (-1);
                        }
                        plp = (struct ppp_ls *)ctrlbuf;
                        if (plp->magic != PPPLSMAGIC) {
                                /* Skip, as we don't understand it */
                                dbglog("read_packet: unrecognized control %lX",
                                    plp->magic);
                                return (-1);
                        }

                        lastlink_status = plp->ppp_message;

                        switch (plp->ppp_message) {
                        case PPP_LINKSTAT_HANGUP:
                                return (0);     /* Hangup */
                        /* For use by integrated drivers. */
                        case PPP_LINKSTAT_UP:
                                lcp_lowerdown(0);
                                lcp_lowerup(0);
                                return (0);
                        case PPP_LINKSTAT_NEEDUP:
                                if (data.len > 0)
                                        dump_packet(buf, data.len);
                                return (-1);    /* Demand dial */
                        case PPP_LINKSTAT_IPV4_UNBOUND:
                                (void) handle_unbind(plp->ppp_message);
                                return (-1);
                        case PPP_LINKSTAT_IPV4_BOUND:
                                (void) handle_bind(plp->ppp_message);
                                return (-1);
#ifdef INET6
                        case PPP_LINKSTAT_IPV6_UNBOUND:
                                (void) handle_unbind(plp->ppp_message);
                                return (-1);
                        case PPP_LINKSTAT_IPV6_BOUND:
                                (void) handle_bind(plp->ppp_message);
                                return (-1);
#endif
                        default:
                                warn("read_packet: unknown link status type!");
                                return (-1);
                        }
                } else {
                        /*
                         * We get here on zero length data or control.
                         */
                        return (-1);
                }
        }
}

/*
 * get_loop_output()
 *
 * Get outgoing packets from the ppp device, and detect when we want to bring
 * the real link up. Return value is 1 if we need to bring up the link, or 0
 * otherwise.
 */
int
get_loop_output()
{
        int loops;

        /*
         * In the Solaris 2.x kernel-level portion implementation, packets
         * which are received on a demand-dial interface are immediately
         * discarded, and a notification message is sent up the control
         * stream to the pppd process.  Therefore, the call to read_packet()
         * below is merely there to wait for such message.
         */
        lastlink_status = 0;
        loops = 0;
        while (read_packet(inpacket_buf) > 0) {
                if (++loops > 10)
                        break;
        }
        return (lastlink_status == PPP_LINKSTAT_NEEDUP);
}

#ifdef MUX_FRAME
/*ARGSUSED*/
void
ppp_send_muxoption(unit, muxflag)
        int unit;
        u_int32_t muxflag;
{
        uint32_t        cf[2];

        /*
         * Since muxed frame feature is implemented in the async module,
         * don't send down the ioctl in the synchronous case.
         */
        if (!sync_serial && fdmuxid >= 0 && pppfd != -1) {
                cf[0] = muxflag;
                cf[1] = X_MUXMASK;

                if (strioctl(pppfd, PPPIO_MUX, cf, sizeof (cf), 0) < 0) {
                        error("Couldn't set mux option: %m");
                }
        }
}

/*ARGSUSED*/
void
ppp_recv_muxoption(unit, muxflag)
        int unit;
        u_int32_t muxflag;
{
        uint32_t        cf[2];

        /*
         * Since muxed frame feature is implemented in the async module,
         * don't send down the ioctl in the synchronous case.
         */
        if (!sync_serial && fdmuxid >= 0 && pppfd != -1) {
                cf[0] = muxflag;
                cf[1] = R_MUXMASK;

                if (strioctl(pppfd, PPPIO_MUX, cf, sizeof (cf), 0) < 0) {
                        error("Couldn't set receive mux option: %m");
                }
        }
}
#endif

/*
 * ppp_send_config()
 *
 * Configure the transmit characteristics of the ppp interface.
 */
/*ARGSUSED*/
void
ppp_send_config(unit, mtu, asyncmap, pcomp, accomp)
        int unit;
        int mtu;
        u_int32_t asyncmap;
        int pcomp;
        int accomp;
{
        uint32_t cf[2];

        if (pppfd == -1) {
                error("ppp_send_config called with invalid device handle");
                return;
        }
        cf[0] = link_mtu = mtu;
        if (strioctl(pppfd, PPPIO_MTU, cf, sizeof (cf[0]), 0) < 0) {
                if (hungup && errno == ENXIO) {
                        return;
                }
                error("Couldn't set MTU: %m");
        }
        if (fdmuxid != -1) {
                if (!sync_serial) {
                        if (strioctl(pppfd, PPPIO_XACCM, &asyncmap,
                            sizeof (asyncmap), 0) < 0) {
                                error("Couldn't set transmit ACCM: %m");
                        }
                }
                cf[0] = (pcomp? COMP_PROT: 0) + (accomp? COMP_AC: 0);
                cf[1] = COMP_PROT | COMP_AC;

                if (any_compressions() && strioctl(pppfd, PPPIO_CFLAGS, cf,
                    sizeof (cf), sizeof (cf[0])) < 0) {
                        error("Couldn't set prot/AC compression: %m");
                }
        }
}

/*
 * ppp_set_xaccm()
 *
 * Set the extended transmit ACCM for the interface.
 */
/*ARGSUSED*/
void
ppp_set_xaccm(unit, accm)
        int unit;
        ext_accm accm;
{
        if (sync_serial) {
                return;
        }
        if (fdmuxid != -1 && strioctl(pppfd, PPPIO_XACCM, accm,
            sizeof (ext_accm), 0) < 0) {
                if (!hungup || errno != ENXIO) {
                        warn("Couldn't set extended ACCM: %m");
                }
        }
}

/*
 * ppp_recv_config()
 *
 * Configure the receive-side characteristics of the ppp interface.
 */
/*ARGSUSED*/
void
ppp_recv_config(unit, mru, asyncmap, pcomp, accomp)
        int unit;
        int mru;
        u_int32_t asyncmap;
        int pcomp;
        int accomp;
{
        uint32_t cf[2];

        if (pppfd == -1) {
                error("ppp_recv_config called with invalid device handle");
                return;
        }
        cf[0] = mru;
        if (strioctl(pppfd, PPPIO_MRU, cf, sizeof (cf[0]), 0) < 0) {
                if (hungup && errno == ENXIO) {
                        return;
                }
                error("Couldn't set MRU: %m");
        }
        if (fdmuxid != -1) {
                if (!sync_serial) {
                        if (strioctl(pppfd, PPPIO_RACCM, &asyncmap,
                            sizeof (asyncmap), 0) < 0) {
                                error("Couldn't set receive ACCM: %m");
                        }
                }
                cf[0] = (pcomp ? DECOMP_PROT : 0) + (accomp ? DECOMP_AC : 0);
                cf[1] = DECOMP_PROT | DECOMP_AC;

                if (any_compressions() && strioctl(pppfd, PPPIO_CFLAGS, cf,
                    sizeof (cf), sizeof (cf[0])) < 0) {
                        error("Couldn't set prot/AC decompression: %m");
                }
        }
}

#ifdef NEGOTIATE_FCS
/*
 * ppp_send_fcs()
 *
 * Configure the sender-side FCS.
 */
/*ARGSUSED*/
void
ppp_send_fcs(unit, fcstype)
        int unit, fcstype;
{
        uint32_t fcs;

        if (sync_serial) {
                return;
        }

        if (fcstype & FCSALT_32) {
                fcs = PPPFCS_32;
        } else if (fcstype & FCSALT_NULL) {
                fcs = PPPFCS_NONE;
        } else {
                fcs = PPPFCS_16;
        }
        if (strioctl(pppfd, PPPIO_XFCS, &fcs, sizeof (fcs), 0) < 0) {
                warn("Couldn't set transmit FCS: %m");
        }
}

/*
 * ppp_recv_fcs()
 *
 * Configure the receiver-side FCS.
 */
/*ARGSUSED*/
void
ppp_recv_fcs(unit, fcstype)
        int unit, fcstype;
{
        uint32_t fcs;

        if (sync_serial) {
                return;
        }

        if (fcstype & FCSALT_32) {
                fcs = PPPFCS_32;
        } else if (fcstype & FCSALT_NULL) {
                fcs = PPPFCS_NONE;
        } else {
                fcs = PPPFCS_16;
        }
        if (strioctl(pppfd, PPPIO_RFCS, &fcs, sizeof (fcs), 0) < 0) {
                warn("Couldn't set receive FCS: %m");
        }
}
#endif

/*
 * ccp_test()
 *
 * Ask kernel whether a given compression method is acceptable for use.
 */
/*ARGSUSED*/
int
ccp_test(unit, opt_ptr, opt_len, for_transmit)
        int unit;
        uchar_t *opt_ptr;
        int opt_len;
        int for_transmit;
{
        if (strioctl(pppfd, (for_transmit ? PPPIO_XCOMP : PPPIO_RCOMP),
            opt_ptr, opt_len, 0) >= 0) {
                return (1);
        }
        warn("Error in %s ioctl: %m",
            (for_transmit ? "PPPIO_XCOMP" : "PPPIO_RCOMP"));
        return ((errno == ENOSR) ? 0 : -1);
}

#ifdef COMP_TUNE
/*
 * ccp_tune()
 *
 * Tune compression effort level.
 */
/*ARGSUSED*/
void
ccp_tune(unit, effort)
        int unit, effort;
{
        uint32_t x;

        x = effort;
        if (strioctl(pppfd, PPPIO_COMPLEV, &x, sizeof (x), 0) < 0) {
                warn("unable to set compression effort level: %m");
        }
}
#endif

/*
 * ccp_flags_set()
 *
 * Inform kernel about the current state of CCP.
 */
/*ARGSUSED*/
void
ccp_flags_set(unit, isopen, isup)
        int unit, isopen, isup;
{
        uint32_t cf[2];

        cf[0] = (isopen ? CCP_ISOPEN : 0) + (isup ? CCP_ISUP : 0);
        cf[1] = CCP_ISOPEN | CCP_ISUP | CCP_ERROR | CCP_FATALERROR;

        if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof (cf), sizeof (cf[0]))
            < 0) {
                if (!hungup || errno != ENXIO) {
                        error("Couldn't set kernel CCP state: %m");
                }
        }
}

/*
 * get_idle_time()
 *
 * Return how long the link has been idle.
 */
/*ARGSUSED*/
int
get_idle_time(u, pids)
        int u;
        struct ppp_idle *pids;
{
        int rc;

        rc = strioctl(pppfd, PPPIO_GIDLE, pids, 0, sizeof (struct ppp_idle));
        if (rc < 0) {
                warn("unable to obtain idle time: %m");
        }
        return ((rc == 0) ? 1 : 0);
}

/*
 * get_ppp_stats()
 *
 * Return statistics for the link.
 */
/*ARGSUSED*/
int
get_ppp_stats(u, stats)
        int u;
        struct pppd_stats *stats;
{
        struct ppp_stats64 s64;
        struct ppp_stats s;

        /* Try first to get these from the 64-bit interface */
        if (strioctl(pppfd, PPPIO_GETSTAT64, &s64, 0, sizeof (s64)) >= 0) {
                stats->bytes_in = s64.p.ppp_ibytes;
                stats->bytes_out = s64.p.ppp_obytes;
                stats->pkts_in = s64.p.ppp_ipackets;
                stats->pkts_out = s64.p.ppp_opackets;
                return (1);
        }

        if (strioctl(pppfd, PPPIO_GETSTAT, &s, 0, sizeof (s)) < 0) {
                error("Couldn't get link statistics: %m");
                return (0);
        }
        stats->bytes_in = s.p.ppp_ibytes;
        stats->bytes_out = s.p.ppp_obytes;
        stats->pkts_in = s.p.ppp_ipackets;
        stats->pkts_out = s.p.ppp_opackets;
        return (1);
}

#if defined(FILTER_PACKETS)
/*
 * set_filters()
 *
 * Transfer the pass and active filters to the kernel.
 */
int
set_filters(pass, active)
        struct bpf_program *pass;
        struct bpf_program *active;
{
        int ret = 1;

        if (pass->bf_len > 0) {
                if (strioctl(pppfd, PPPIO_PASSFILT, pass,
                    sizeof (struct bpf_program), 0) < 0) {
                        error("Couldn't set pass-filter in kernel: %m");
                        ret = 0;
                }
        }
        if (active->bf_len > 0) {
                if (strioctl(pppfd, PPPIO_ACTIVEFILT, active,
                    sizeof (struct bpf_program), 0) < 0) {
                        error("Couldn't set active-filter in kernel: %m");
                        ret = 0;
                }
        }
        return (ret);
}
#endif /* FILTER_PACKETS */

/*
 * ccp_fatal_error()
 *
 * Returns 1 if decompression was disabled as a result of an error detected
 * after decompression of a packet, 0 otherwise.  This is necessary because
 * of patent nonsense.
 */
/*ARGSUSED*/
int
ccp_fatal_error(unit)
        int unit;
{
        uint32_t cf[2];

        cf[0] = cf[1] = 0;
        if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof (cf), sizeof (cf[0]))
            < 0) {
                if (errno != ENXIO && errno != EINVAL) {
                        error("Couldn't get compression flags: %m");
                }
                return (0);
        }
        return (cf[0] & CCP_FATALERROR);
}

/*
 * sifvjcomp()
 *
 * Config TCP header compression.
 */
/*ARGSUSED*/
int
sifvjcomp(u, vjcomp, xcidcomp, xmaxcid)
        int u, vjcomp, xcidcomp, xmaxcid;
{
        uint32_t cf[2];
        uchar_t maxcid[2];

        /*
         * Since VJ compression code is in the comp module, there's no
         * point of sending down any ioctls pertaining to VJ compression
         * when the module isn't pushed on the stream.
         */
        if (!any_compressions()) {
                return (1);
        }

        if (vjcomp) {
                maxcid[0] = xcidcomp;
                maxcid[1] = 15;         /* XXX should be rmaxcid */

                if (strioctl(pppfd, PPPIO_VJINIT, maxcid,
                    sizeof (maxcid), 0) < 0) {
                        error("Couldn't initialize VJ compression: %m");
                        return (0);
                }
        }

        cf[0] = (vjcomp ? COMP_VJC + DECOMP_VJC : 0)    /* XXX this is wrong */
                + (xcidcomp? COMP_VJCCID + DECOMP_VJCCID: 0);

        cf[1] = COMP_VJC + DECOMP_VJC + COMP_VJCCID + DECOMP_VJCCID;

        if (strioctl(pppfd, PPPIO_CFLAGS, cf, sizeof (cf), sizeof (cf[0]))
            < 0) {
                if (vjcomp) {
                        error("Couldn't enable VJ compression: %m");
                } else {
                        error("Couldn't disable VJ compression: %m");
                }
                return (0);
        }
        return (1);
}

/*
 * siflags()
 *
 * Set or clear the IP interface flags.
 */
int
siflags(f, set)
        u_int32_t f;
        int set;
{
        struct ifreq ifr;

        if (!IPCP_ENABLED || (ipmuxid == -1)) {
                return (0);
        }
        if (ipfd == -1 && open_ipfd() == -1)
                return (0);
        BZERO(&ifr, sizeof (ifr));
        (void) strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
        if (myioctl(ipfd, SIOCGIFFLAGS, &ifr) < 0) {
                error("Couldn't get IP interface flags: %m");
                return (0);
        }
        if (set) {
                ifr.ifr_flags |= f;
        } else {
                ifr.ifr_flags &= ~f;
        }
        if (myioctl(ipfd, SIOCSIFFLAGS, &ifr) < 0) {
                error("Couldn't set IP interface flags: %m");
                return (0);
        }
        return (1);
}

/*
 * sifup()
 *
 * Config the interface up and enable IP packets to pass.
 */
/*ARGSUSED*/
int
sifup(u)
        int u;
{
        if (if_is_up) {
                return (1);
        } else if (!IPCP_ENABLED) {
                warn("sifup called when IPCP is disabled");
                return (0);
        } else if (ipmuxid == -1) {
                warn("sifup called in wrong state");
                return (0);
        } else if (!siflags(IFF_UP, 1)) {
                error("Unable to mark the IP interface UP");
                return (0);
        }
        if_is_up = 1;
        return (1);
}

/*
 * sifdown()
 *
 * Config the interface down and disable IP.  Possibly called from die(),
 * so there shouldn't be any call to die() here.
 */
/*ARGSUSED*/
int
sifdown(u)
        int u;
{
        if (!IPCP_ENABLED) {
                warn("sifdown called when IPCP is disabled");
                return (0);
        } else if (!if_is_up || (ipmuxid == -1)) {
                return (1);
        } else if (!siflags(IFF_UP, 0)) {
                error("Unable to mark the IP interface DOWN");
                return (0);
        }
        if_is_up = 0;
        return (1);
}

/*
 * sifnpmode()
 *
 * Set the mode for handling packets for a given NP.  Not worried
 * about performance here since this is done only rarely.
 */
/*ARGSUSED*/
int
sifnpmode(u, proto, mode)
        int u;
        int proto;
        enum NPmode mode;
{
        uint32_t npi[2];
        const char *cp;
        static const struct npi_entry {
                enum NPmode ne_value;
                const char *ne_name;
        } npi_list[] = {
                { NPMODE_PASS, "pass" },
                { NPMODE_DROP, "drop" },
                { NPMODE_ERROR, "error" },
                { NPMODE_QUEUE, "queue" },
        };
        int i;
        char pname[32], mname[32];

        npi[0] = proto;
        npi[1] = (uint32_t)mode;

        cp = protocol_name(proto);
        if (cp == NULL)
                (void) slprintf(pname, sizeof (pname), "NP %04X", proto);
        else
                (void) strlcpy(pname, cp, sizeof (pname));
        for (i = 0; i < Dim(npi_list); i++)
                if (npi_list[i].ne_value == mode)
                        break;
        if (i >= Dim(npi_list))
                (void) slprintf(mname, sizeof (mname), "mode %d", (int)mode);
        else
                (void) strlcpy(mname, npi_list[i].ne_name, sizeof (mname));

        if ((proto == PPP_IP && !if_is_up) ||
            (proto == PPP_IPV6 && !if6_is_up)) {
                dbglog("ignoring request to set %s to %s", pname, mname);
                return (1);
        }
        if (strioctl(pppfd, PPPIO_NPMODE, npi, sizeof (npi), 0) < 0) {
                error("unable to set %s to %s: %m", pname, mname);
                return (0);
        }
        return (1);
}

/*
 * sifmtu()
 *
 * Config the interface IP MTU.
 */
int
sifmtu(mtu)
        int mtu;
{
        struct ifreq ifr;

        if (!IPCP_ENABLED || (ipmuxid == -1)) {
                return (0);
        }
        if (ipfd == -1 && open_ipfd() == -1)
                return (0);
        BZERO(&ifr, sizeof (ifr));
        (void) strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
        ifr.ifr_metric = mtu;
        if (myioctl(ipfd, SIOCSIFMTU, &ifr) < 0) {
                error("Couldn't set IP MTU on %s to %d: %m", ifr.ifr_name,
                    mtu);
                return (0);
        }
        return (1);
}

/*
 * sifaddr()
 *
 * Config the interface IP addresses and netmask.
 */
/*ARGSUSED*/
int
sifaddr(u, o, h, m)
        int u;
        u_int32_t o;
        u_int32_t h;
        u_int32_t m;
{
        struct ifreq ifr;
        struct sockaddr_in sin;

        if (!IPCP_ENABLED || (ipmuxid == -1 && plumb_ipif(u) == 0)) {
                return (0);
        }
        if (ipfd == -1 && open_ipfd() == -1)
                return (0);
        /*
         * Set the IP interface MTU.
         */
        if (!sifmtu(link_mtu)) {
                return (0);
        }
        /*
         * Set the IP interface local point-to-point address.
         */
        BZERO(&sin, sizeof (sin));
        sin.sin_family = AF_INET;
        sin.sin_addr.s_addr = o;

        BZERO(&ifr, sizeof (ifr));
        (void) strlcpy(ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
        ifr.ifr_addr = *(struct sockaddr *)&sin;
        if (myioctl(ipfd, SIOCSIFADDR, &ifr) < 0) {
                error("Couldn't set local IP address (%s): %m", ifr.ifr_name);
                return (0);
        }
        /*
         * Set the IP interface remote point-to-point address.
         */
        sin.sin_addr.s_addr = h;

        ifr.ifr_dstaddr = *(struct sockaddr *)&sin;
        if (myioctl(ipfd, SIOCSIFDSTADDR, &ifr) < 0) {
                error("Couldn't set remote IP address (%s): %m", ifr.ifr_name);
                return (0);
        }
        remote_addr = h;
        return (1);
}

/*
 * cifaddr()
 *
 * Clear the interface IP addresses.
 */
/*ARGSUSED*/
int
cifaddr(u, o, h)
        int u;
        u_int32_t o;
        u_int32_t h;
{
        if (!IPCP_ENABLED) {
                return (0);
        }
        /*
         * Most of the work is done in sifdown().
         */
        remote_addr = 0;
        return (1);
}

/*
 * sifroute()
 *
 * Add or delete a route.
 */
/*ARGSUSED*/
static int
sifroute(int u, u_int32_t l, u_int32_t g, int add, const char *str)
{
        struct sockaddr_in sin_dst, sin_gtw;
        struct rtentry rt;

        if (!IPCP_ENABLED || (ipmuxid == -1)) {
                error("Can't %s route: IP is not enabled", str);
                return (0);
        }
        if (ipfd == -1 && open_ipfd() == -1)
                return (0);

        BZERO(&sin_dst, sizeof (sin_dst));
        sin_dst.sin_family = AF_INET;
        sin_dst.sin_addr.s_addr = l;

        BZERO(&sin_gtw, sizeof (sin_gtw));
        sin_gtw.sin_family = AF_INET;
        sin_gtw.sin_addr.s_addr = g;

        BZERO(&rt, sizeof (rt));
        rt.rt_dst = *(struct sockaddr *)&sin_dst;
        rt.rt_gateway = *(struct sockaddr *)&sin_gtw;
        rt.rt_flags = (RTF_GATEWAY|RTF_STATIC);

        if (myioctl(ipfd, (add ? SIOCADDRT : SIOCDELRT), &rt) < 0) {
                error("Can't %s route: %m", str);
                return (0);
        }
        return (1);
}

/*
 * sifdefaultroute()
 *
 * Assign a default route through the address given.
 */
/*ARGSUSED*/
int
sifdefaultroute(u, l, g)
        int u;
        u_int32_t l;
        u_int32_t g;
{
        if (!sifroute(u, 0, g, 1, "add default")) {
                return (0);
        }
        default_route_gateway = g;
        return (1);
}

/*
 * cifdefaultroute()
 *
 * Delete a default route through the address given.
 */
/*ARGSUSED*/
int
cifdefaultroute(u, l, g)
        int u;
        u_int32_t l;
        u_int32_t g;
{
        if (!sifroute(u, 0, g, 0, "delete default")) {
                return (0);
        }
        default_route_gateway = 0;
        return (1);
}

/*
 * sifproxyarp()
 *
 * Make a proxy ARP entry for the peer.
 */
/*ARGSUSED*/
int
sifproxyarp(unit, hisaddr, quietflag)
        int unit;
        u_int32_t hisaddr;
        int quietflag;
{
        struct sockaddr_in sin;
        struct xarpreq arpreq;
        const uchar_t *cp;
        char *str = NULL;

        if (!IPCP_ENABLED || (ipmuxid == -1)) {
                return (0);
        }
        if (ipfd == -1 && open_ipfd() == -1)
                return (0);

        BZERO(&sin, sizeof (sin));
        sin.sin_family = AF_INET;
        sin.sin_addr.s_addr = hisaddr;

        BZERO(&arpreq, sizeof (arpreq));
        if (!get_ether_addr(hisaddr, &arpreq.xarp_ha, quietflag)) {
                return (0);
        }
        BCOPY(&sin, &arpreq.xarp_pa, sizeof (sin));
        arpreq.xarp_flags = ATF_PERM | ATF_PUBL;
        arpreq.xarp_ha.sdl_family = AF_LINK;

        if (myioctl(ipfd, SIOCSXARP, (caddr_t)&arpreq) < 0) {
                if (!quietflag)
                        error("Couldn't set proxy ARP entry: %m");
                return (0);
        }
        cp = (const uchar_t *)LLADDR(&arpreq.xarp_ha);
        str = _link_ntoa(cp, str, arpreq.xarp_ha.sdl_alen, IFT_OTHER);
        if (str != NULL) {
                dbglog("established proxy ARP for %I using %s", hisaddr,
                    str);
                free(str);
        }
        proxy_arp_addr = hisaddr;
        return (1);
}

/*
 * cifproxyarp()
 *
 * Delete the proxy ARP entry for the peer.
 */
/*ARGSUSED*/
int
cifproxyarp(unit, hisaddr)
        int unit;
        u_int32_t hisaddr;
{
        struct sockaddr_in sin;
        struct xarpreq arpreq;

        if (!IPCP_ENABLED || (ipmuxid == -1)) {
                return (0);
        }
        if (ipfd == -1 && open_ipfd() == -1)
                return (0);

        BZERO(&sin, sizeof (sin));
        sin.sin_family = AF_INET;
        sin.sin_addr.s_addr = hisaddr;

        BZERO(&arpreq, sizeof (arpreq));
        BCOPY(&sin, &arpreq.xarp_pa, sizeof (sin));
        arpreq.xarp_ha.sdl_family = AF_LINK;

        if (myioctl(ipfd, SIOCDXARP, (caddr_t)&arpreq) < 0) {
                error("Couldn't delete proxy ARP entry: %m");
                return (0);
        }
        proxy_arp_addr = 0;
        return (1);
}

/*
 * get_ether_addr()
 *
 * Get the hardware address of an interface on the the same subnet as
 * ipaddr.  This routine uses old-style interfaces for intentional
 * backward compatibility -- SIOCGLIF* isn't in older Solaris
 * releases.
 */
static int
get_ether_addr(u_int32_t ipaddr, struct sockaddr_dl *hwaddr, int quietflag)
{
        struct ifreq *ifr, *ifend, ifreq;
        int nif, s, retv;
        struct ifconf ifc;
        u_int32_t ina, mask;
        struct xarpreq req;
        struct sockaddr_in sin;

        if (ipfd == -1 && open_ipfd() == -1)
                return (0);

        /*
         * Scan through the system's network interfaces.
         */
        if (myioctl(ipfd, SIOCGIFNUM, &nif) < 0) {
                nif = MAXIFS;
        }
        if (nif <= 0)
                return (0);
        ifc.ifc_len = nif * sizeof (struct ifreq);
        ifc.ifc_buf = (caddr_t)malloc(ifc.ifc_len);
        if (ifc.ifc_buf == NULL) {
                return (0);
        }
        if (myioctl(ipfd, SIOCGIFCONF, &ifc) < 0) {
                error("Couldn't get system interface list: %m");
                free(ifc.ifc_buf);
                return (0);
        }
        /* LINTED */
        ifend = (struct ifreq *)(ifc.ifc_buf + ifc.ifc_len);
        for (ifr = ifc.ifc_req; ifr < ifend; ++ifr) {
                if (ifr->ifr_addr.sa_family != AF_INET) {
                        continue;
                }
                /*
                 * Check that the interface is up, and not
                 * point-to-point or loopback.
                 */
                (void) strlcpy(ifreq.ifr_name, ifr->ifr_name,
                    sizeof (ifreq.ifr_name));
                if (myioctl(ipfd, SIOCGIFFLAGS, &ifreq) < 0) {
                        continue;
                }
                if ((ifreq.ifr_flags & (IFF_UP|IFF_BROADCAST|IFF_POINTOPOINT|
                    IFF_LOOPBACK|IFF_NOARP)) != (IFF_UP|IFF_BROADCAST)) {
                        continue;
                }
                /*
                 * Get its netmask and check that it's on the right subnet.
                 */
                if (myioctl(ipfd, SIOCGIFNETMASK, &ifreq) < 0) {
                        continue;
                }
                (void) memcpy(&sin, &ifr->ifr_addr, sizeof (sin));
                ina = sin.sin_addr.s_addr;
                (void) memcpy(&sin, &ifreq.ifr_addr, sizeof (sin));
                mask = sin.sin_addr.s_addr;
                if ((ipaddr & mask) == (ina & mask)) {
                        break;
                }
        }
        if (ifr >= ifend) {
                if (!quietflag)
                        warn("No suitable interface found for proxy ARP of %I",
                            ipaddr);
                free(ifc.ifc_buf);
                return (0);
        }
        info("found interface %s for proxy ARP of %I", ifr->ifr_name, ipaddr);

        /*
         * New way - get the address by doing an arp request.
         */
        s = socket(AF_INET, SOCK_DGRAM, 0);
        if (s < 0) {
                error("get_ether_addr: error opening IP socket: %m");
                free(ifc.ifc_buf);
                return (0);
        }
        BZERO(&sin, sizeof (sin));
        sin.sin_family = AF_INET;
        sin.sin_addr.s_addr = ina;

        BZERO(&req, sizeof (req));
        BCOPY(&sin, &req.xarp_pa, sizeof (sin));
        req.xarp_ha.sdl_family = AF_LINK;

        if (myioctl(s, SIOCGXARP, &req) < 0) {
                error("Couldn't get ARP entry for %I: %m", ina);
                retv = 0;
        } else {
                (void) memcpy(hwaddr, &req.xarp_ha,
                    sizeof (struct sockaddr_dl));
                retv = 1;
        }
        (void) close(s);
        free(ifc.ifc_buf);
        return (retv);
}

/*
 * GetMask()
 *
 * Return mask (bogus, but needed for compatibility with other platforms).
 */
/*ARGSUSED*/
u_int32_t
GetMask(addr)
        u_int32_t addr;
{
        return (0xffffffffUL);
}

/*
 * logwtmp()
 *
 * Write an accounting record to the /var/log/wtmp file.
 */
/*ARGSUSED*/
void
logwtmp(line, name, host)
        const char *line;
        const char *name;
        const char *host;
{
        static struct utmpx utmpx;

        if (name[0] != '\0') {
                /*
                 * logging in
                 */
                (void) strncpy(utmpx.ut_user, name, sizeof (utmpx.ut_user));
                (void) strncpy(utmpx.ut_id, ifname, sizeof (utmpx.ut_id));
                (void) strncpy(utmpx.ut_line, line, sizeof (utmpx.ut_line));

                utmpx.ut_pid = getpid();
                utmpx.ut_type = USER_PROCESS;
        } else {
                utmpx.ut_type = DEAD_PROCESS;
        }
        (void) gettimeofday(&utmpx.ut_tv, NULL);
        updwtmpx("/var/log/wtmpx", &utmpx);
}

/*
 * get_host_seed()
 *
 * Return the serial number of this machine.
 */
int
get_host_seed()
{
        char buf[32];

        if (sysinfo(SI_HW_SERIAL, buf, sizeof (buf)) < 0) {
                error("sysinfo: %m");
                return (0);
        }
        return ((int)strtoul(buf, NULL, 16));
}

/*
 * strioctl()
 *
 * Wrapper for STREAMS I_STR ioctl.  Masks out EINTR from caller.
 */
static int
strioctl(int fd, int cmd, void *ptr, int ilen, int olen)
{
        struct strioctl str;

        str.ic_cmd = cmd;
        str.ic_timout = PPPSTRTIMOUT;
        str.ic_len = ilen;
        str.ic_dp = ptr;

        if (myioctl(fd, I_STR, &str) == -1) {
                return (-1);
        }
        if (str.ic_len != olen) {
                dbglog("strioctl: expected %d bytes, got %d for cmd %x\n",
                    olen, str.ic_len, cmd);
        }
        return (0);
}

/*
 * have_route_to()
 *
 * Determine if the system has a route to the specified IP address.
 * Returns 0 if not, 1 if so, -1 if we can't tell. `addr' is in network
 * byte order. For demand mode to work properly, we have to ignore routes
 * through our own interface. XXX Would be nice to use routing socket.
 */
int
have_route_to(addr)
        u_int32_t addr;
{
        int r, flags, i;
        struct {
                struct T_optmgmt_req req;
                struct opthdr hdr;
        } req;
        union {
                struct T_optmgmt_ack ack;
                unsigned char space[64];
        } ack;
        struct opthdr *rh;
        struct strbuf cbuf, dbuf;
        int nroutes;
        mib2_ipRouteEntry_t routes[8];
        mib2_ipRouteEntry_t *rp;

        if (ipfd == -1 && open_ipfd() == -1)
                return (0);

        req.req.PRIM_type = T_OPTMGMT_REQ;
        req.req.OPT_offset = (caddr_t)&req.hdr - (caddr_t)&req;
        req.req.OPT_length = sizeof (req.hdr);
#ifdef T_CURRENT
        req.req.MGMT_flags = T_CURRENT;
#else
        /* Old-style */
        req.req.MGMT_flags = T_CHECK;
#endif

        req.hdr.level = MIB2_IP;
        req.hdr.name = 0;
        req.hdr.len = 0;

        cbuf.buf = (caddr_t)&req;
        cbuf.len = sizeof (req);

        if (putmsg(ipfd, &cbuf, NULL, 0) == -1) {
                warn("have_route_to: putmsg: %m");
                return (-1);
        }

        for (;;) {
                cbuf.buf = (caddr_t)&ack;
                cbuf.maxlen = sizeof (ack);
                dbuf.buf = (caddr_t)routes;
                dbuf.maxlen = sizeof (routes);
                flags = 0;
                r = getmsg(ipfd, &cbuf, &dbuf, &flags);
                if (r == -1) {
                        warn("have_route_to: getmsg: %m");
                        return (-1);
                }

                if (cbuf.len < sizeof (struct T_optmgmt_ack) ||
                    ack.ack.PRIM_type != T_OPTMGMT_ACK ||
                    ack.ack.MGMT_flags != T_SUCCESS ||
                    ack.ack.OPT_length < sizeof (struct opthdr)) {
                        dbglog("have_route_to: bad message len=%d prim=%d",
                            cbuf.len, ack.ack.PRIM_type);
                        return (-1);
                }
                /* LINTED */
                rh = (struct opthdr *)((caddr_t)&ack + ack.ack.OPT_offset);
                if (rh->level == 0 && rh->name == 0) {
                        break;
                }
                if (rh->level != MIB2_IP || rh->name != MIB2_IP_21) {
                        while (r == MOREDATA) {
                                r = getmsg(ipfd, NULL, &dbuf, &flags);
                        }
                        continue;
                }

                /*
                 * Note that we have to skip routes to our own
                 * interface in order for demand dial to work.
                 *
                 * XXX awful hack here.  We don't know our own
                 * ifIndex, so we can't check ipRouteIfIndex here.
                 * Instead, we check the next hop address.
                 */
                for (;;) {
                        nroutes = dbuf.len / sizeof (mib2_ipRouteEntry_t);
                        for (rp = routes, i = 0; i < nroutes; ++i, ++rp) {
                                if (rp->ipRouteNextHop != remote_addr &&
                                    ((addr ^ rp->ipRouteDest) &
                                        rp->ipRouteMask) == 0) {
                                        dbglog("have route to %I/%I via %I",
                                            rp->ipRouteDest,
                                            rp->ipRouteMask,
                                            rp->ipRouteNextHop);
                                        return (1);
                                }
                        }
                        if (r == 0) {
                                break;
                        }
                        r = getmsg(ipfd, NULL, &dbuf, &flags);
                }
        }
        return (0);
}

/*
 * get_pty()
 *
 * Get a pty master/slave pair and chown the slave side to the uid given.
 * Assumes slave_name points to MAXPATHLEN bytes of space.
 */
int
get_pty(master_fdp, slave_fdp, slave_name, uid)
        int *master_fdp;
        int *slave_fdp;
        char *slave_name;
        int uid;
{
        int mfd;
        int sfd;
        char *pty_name;

        mfd = open("/dev/ptmx", O_NOCTTY | O_RDWR);
        if (mfd < 0) {
                error("Couldn't open pty master: %m");
                return (0);
        }
        pty_name = ptsname(mfd);
        if (pty_name == NULL) {
                dbglog("Didn't get pty slave name on first try; sleeping.");
                /* In case "grow" operation is in progress; try again. */
                (void) sleep(1);
                pty_name = ptsname(mfd);
        }
        if (pty_name == NULL) {
                error("Couldn't get name of pty slave");
                (void) close(mfd);
                return (0);
        }
        if (chown(pty_name, uid, -1) < 0) {
                warn("Couldn't change owner of pty slave: %m");
        }
        if (chmod(pty_name, S_IRUSR | S_IWUSR) < 0) {
                warn("Couldn't change permissions on pty slave: %m");
        }
        if (unlockpt(mfd) < 0) {
                warn("Couldn't unlock pty slave: %m");
        }
        sfd = open(pty_name, O_RDWR);
        if (sfd < 0) {
                error("Couldn't open pty slave %s: %m", pty_name);
                (void) close(mfd);
                return (0);
        }
        if (myioctl(sfd, I_PUSH, "ptem") < 0) {
                warn("Couldn't push ptem module on pty slave: %m");
        }
        dbglog("Using %s; master fd %d, slave fd %d", pty_name, mfd, sfd);

        (void) strlcpy(slave_name, pty_name, MAXPATHLEN);

        *master_fdp = mfd;
        *slave_fdp = sfd;

        return (1);
}

#ifdef INET6
static int
open_udp6fd(void)
{
        int udp6fd;

        udp6fd = open(UDP6_DEV_NAME, O_RDWR | O_NONBLOCK, 0);
        if (udp6fd < 0) {
                error("Couldn't open UDPv6 device (%s): %m", UDP6_DEV_NAME);
        }
        return (udp6fd);
}

/*
 * plumb_ip6if()
 *
 * Perform IPv6 interface plumbing.
 */
/*ARGSUSED*/
static int
plumb_ip6if(int unit)
{
        int udp6fd = -1, tmpfd;
        uint32_t x;
        struct lifreq lifr;

        if (!IPV6CP_ENABLED || (ifunit == -1) || (pppfd == -1)) {
                return (0);
        }
        if (plumbed)
                return (1);
        if (ip6fd == -1 && open_ip6fd() == -1)
                return (0);
        if (use_plink && (udp6fd = open_udp6fd()) == -1)
                return (0);
        tmpfd = open(drvnam, O_RDWR | O_NONBLOCK, 0);
        if (tmpfd < 0) {
                error("Couldn't open PPP device (%s): %m", drvnam);
                if (udp6fd != -1)
                        (void) close(udp6fd);
                return (0);
        }
        if (kdebugflag & 1) {
                x = PPPDBG_LOG + PPPDBG_DRIVER;
                if (strioctl(tmpfd, PPPIO_DEBUG, &x, sizeof (x), 0) < 0) {
                        warn("PPPIO_DEBUG ioctl for mux failed: %m");
                }
        }
        if (myioctl(tmpfd, I_PUSH, IP_MOD_NAME) < 0) {
                error("Couldn't push IP module(%s): %m", IP_MOD_NAME);
                goto err_ret;
        }
        /*
         * Sets interface ppa and flags (refer to comments in plumb_ipif for
         * the IF_UNITSEL ioctl). In addition, the IFF_IPV6 bit must be set in
         * order to declare this as an IPv6 interface.
         */
        BZERO(&lifr, sizeof (lifr));
        if (myioctl(tmpfd, SIOCGLIFFLAGS, &lifr) < 0) {
                error("Couldn't get IPv6 interface flags: %m");
                goto err_ret;
        }
        lifr.lifr_flags |= IFF_IPV6;
        lifr.lifr_flags &= ~(IFF_BROADCAST | IFF_IPV4);
        lifr.lifr_ppa = ifunit;
        (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
        if (myioctl(tmpfd, SIOCSLIFNAME, &lifr) < 0) {
                error("Can't set ifname for unit %d: %m", ifunit);
                goto err_ret;
        }
        if (use_plink) {
                ip6muxid = myioctl(udp6fd, I_PLINK, (void *)tmpfd);
                if (ip6muxid < 0) {
                        error("Can't I_PLINK PPP device to IPv6: %m");
                        goto err_ret;
                }
        } else {
                ip6muxid = myioctl(ip6fd, I_LINK, (void *)tmpfd);
                if (ip6muxid < 0) {
                        error("Can't I_LINK PPP device to IPv6: %m");
                        goto err_ret;
                }
        }
        lifr.lifr_ip_muxid = ip6muxid;
        lifr.lifr_arp_muxid = -1;
        if (myioctl(ip6fd, SIOCSLIFMUXID, (caddr_t)&lifr) < 0) {
                error("Can't set mux ID:  SIOCSLIFMUXID: %m");
                goto err_ret;
        }
        (void) close(tmpfd);
        if (udp6fd != -1)
                (void) close(udp6fd);
        return (1);

err_ret:
        (void) close(tmpfd);
        if (udp6fd != -1)
                (void) close(udp6fd);
        return (0);
}

/*
 * unplumb_ip6if()
 *
 * Perform IPv6 interface unplumbing.  Possibly called from die(), so there
 * shouldn't be any call to die() here.
 */
static int
unplumb_ip6if(int unit)
{
        int udp6fd = -1, fd = -1;
        int id;
        struct lifreq lifr;

        if (!IPV6CP_ENABLED || ifunit == -1) {
                return (0);
        }
        if (!plumbed && (ip6muxid == -1 || (ip6fd == -1 && !use_plink))) {
                return (1);
        }
        id = ip6muxid;
        if (!plumbed && use_plink) {
                if ((udp6fd = open_udp6fd()) == -1)
                        return (0);
                /*
                 * Note: must re-get mux ID, since any intervening
                 * ifconfigs will change this.
                 */
                BZERO(&lifr, sizeof (lifr));
                (void) strlcpy(lifr.lifr_name, ifname,
                    sizeof (lifr.lifr_name));
                if (myioctl(ip6fd, SIOCGLIFMUXID, (caddr_t)&lifr) < 0) {
                        warn("Can't get mux fd: SIOCGLIFMUXID: %m");
                } else {
                        id = lifr.lifr_ip_muxid;
                        fd = myioctl(udp6fd, _I_MUXID2FD, (void *)id);
                        if (fd < 0) {
                                warn("Can't get mux fd: _I_MUXID2FD: %m");
                        }
                }
        }
        /*
         * Mark down and unlink the IPv6 interface.
         */
        (void) sif6down(unit);
        if (plumbed)
                return (1);
        ip6muxid = -1;
        if (use_plink) {
                if ((fd = myioctl(udp6fd, _I_MUXID2FD, (void *)id)) < 0) {
                        error("Can't recapture mux fd: _I_MUXID2FD: %m");
                        (void) close(udp6fd);
                        return (0);
                }
                if (myioctl(udp6fd, I_PUNLINK, (void *)id) < 0) {
                        error("Can't I_PUNLINK PPP from IPv6: %m");
                        (void) close(fd);
                        (void) close(udp6fd);
                        return (0);
                }
                (void) close(fd);
                (void) close(udp6fd);
        } else {
                if (myioctl(ip6fd, I_UNLINK, (void *)id) < 0) {
                        error("Can't I_UNLINK PPP from IPv6: %m");
                        return (0);
                }
        }
        return (1);
}

/*
 * sif6flags()
 *
 * Set or clear the IPv6 interface flags.
 */
int
sif6flags(f, set)
        u_int32_t f;
        int set;
{
        struct lifreq lifr;
        int fd;

        if (!IPV6CP_ENABLED || (ip6muxid == -1)) {
                return (0);
        }
        fd = socket(AF_INET6, SOCK_DGRAM, 0);
        if (fd < 0) {
                error("sif6flags: error opening IPv6 socket: %m");
                return (0);
        }
        BZERO(&lifr, sizeof (lifr));
        (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
        if (myioctl(fd, SIOCGLIFFLAGS, &lifr) < 0) {
                error("Couldn't get IPv6 interface flags: %m");
                (void) close(fd);
                return (0);
        }
        if (set) {
                lifr.lifr_flags |= f;
        } else {
                lifr.lifr_flags &= ~f;
        }
        (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
        if (myioctl(fd, SIOCSLIFFLAGS, &lifr) < 0) {
                error("Couldn't set IPv6 interface flags: %m");
                (void) close(fd);
                return (0);
        }
        (void) close(fd);
        return (1);
}

/*
 * sif6up()
 *
 * Config the IPv6 interface up and enable IPv6 packets to pass.
 */
/*ARGSUSED*/
int
sif6up(unit)
        int unit;
{
        if (if6_is_up) {
                return (1);
        } else if (!IPV6CP_ENABLED) {
                warn("sif6up called when IPV6CP is disabled");
                return (0);
        } else if (ip6muxid == -1) {
                warn("sif6up called in wrong state");
                return (0);
        } else if (!sif6flags(IFF_UP, 1)) {
                error("Unable to mark the IPv6 interface UP");
                return (0);
        }
        if6_is_up = 1;
        return (1);
}

/*
 * sif6down()
 *
 * Config the IPv6 interface down and disable IPv6.  Possibly called from
 * die(), so there shouldn't be any call to die() here.
 */
/*ARGSUSED*/
int
sif6down(unit)
        int unit;
{
        if (!IPV6CP_ENABLED) {
                warn("sif6down called when IPV6CP is disabled");
                return (0);
        } else if (!if6_is_up || (ip6muxid == -1)) {
                return (1);
        } else if (!sif6flags(IFF_UP, 0)) {
                error("Unable to mark the IPv6 interface DOWN");
                return (0);
        }
        if6_is_up = 0;
        return (1);
}

/*
 * sif6mtu()
 *
 * Config the IPv6 interface MTU.
 */
int
sif6mtu(mtu)
        int mtu;
{
        struct lifreq lifr;
        int s;

        if (!IPV6CP_ENABLED || (ip6muxid == -1)) {
                return (0);
        }
        s = socket(AF_INET6, SOCK_DGRAM, 0);
        if (s < 0) {
                error("sif6mtu: error opening IPv6 socket: %m");
                return (0);
        }
        BZERO(&lifr, sizeof (lifr));
        (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
        lifr.lifr_mtu = mtu;
        if (myioctl(s, SIOCSLIFMTU, &lifr) < 0) {
                error("Couldn't set IPv6 MTU (%s): %m", lifr.lifr_name);
                (void) close(s);
                return (0);
        }
        (void) close(s);
        return (1);
}

/*
 * sif6addr()
 *
 * Config the interface with an IPv6 link-local address.
 */
/*ARGSUSED*/
int
sif6addr(unit, ourid, hisid)
        int unit;
        eui64_t ourid;
        eui64_t hisid;
{
        struct lifreq lifr;
        struct sockaddr_storage laddr;
        struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&laddr;
        int fd;

        if (!IPV6CP_ENABLED || (ip6muxid == -1 && plumb_ip6if(unit) == 0)) {
                return (0);
        }
        fd = socket(AF_INET6, SOCK_DGRAM, 0);
        if (fd < 0) {
                error("sif6addr: error opening IPv6 socket: %m");
                return (0);
        }
        /*
         * Set the IPv6 interface MTU.
         */
        if (!sif6mtu(link_mtu)) {
                (void) close(fd);
                return (0);
        }
        /*
         * Set the interface address token.  Do this because /dev/ppp responds
         * to DL_PHYS_ADDR_REQ with zero values, hence the interface token
         * came to be zero too, and without this, in.ndpd will complain.
         */
        BZERO(&lifr, sizeof (lifr));
        (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
        BZERO(sin6, sizeof (struct sockaddr_in6));
        IN6_LLTOKEN_FROM_EUI64(lifr, sin6, ourid);
        if (myioctl(fd, SIOCSLIFTOKEN, &lifr) < 0) {
                error("Couldn't set IPv6 token (%s): %m", lifr.lifr_name);
                (void) close(fd);
                return (0);
        }
        /*
         * Set the IPv6 interface local point-to-point address.
         */
        IN6_LLADDR_FROM_EUI64(lifr, sin6, ourid);
        if (myioctl(fd, SIOCSLIFADDR, &lifr) < 0) {
                error("Couldn't set local IPv6 address (%s): %m",
                    lifr.lifr_name);
                (void) close(fd);
                return (0);
        }
        /*
         * Set the IPv6 interface local point-to-point address.
         */
        BZERO(&lifr, sizeof (lifr));
        (void) strlcpy(lifr.lifr_name, ifname, sizeof (lifr.lifr_name));
        IN6_LLADDR_FROM_EUI64(lifr, sin6, hisid);
        if (myioctl(fd, SIOCSLIFDSTADDR, &lifr) < 0) {
                error("Couldn't set remote IPv6 address (%s): %m",
                    lifr.lifr_name);
                (void) close(fd);
                return (0);
        }
        (void) close(fd);
        return (1);
}

/*
 * cif6addr()
 */
/*ARGSUSED*/
int
cif6addr(u, o, h)
        int u;
        eui64_t o;
        eui64_t h;
{
        if (!IPV6CP_ENABLED) {
                return (0);
        }
        /*
         * Do nothing here, as everything has been done in sif6down().
         */
        return (1);
}

/*
 * ether_to_eui64()
 *
 * Convert 48-bit Ethernet address into 64-bit EUI. Walks the list of valid
 * ethernet interfaces, and convert the first found 48-bit MAC address into
 * EUI 64. caller also assumes that the system has a properly configured
 * Ethernet interface for this function to return non-zero.
 */
int
ether_to_eui64(p_eui64)
        eui64_t *p_eui64;
{
        struct ether_addr eth_addr;

        if (p_eui64 == NULL) {
                return (0);
        }
        if (!get_first_hwaddr(eth_addr.ether_addr_octet,
            sizeof (eth_addr.ether_addr_octet))) {
                return (0);
        }
        /*
         * And convert the EUI-48 into EUI-64, per RFC 2472 [sec 4.1]
         */
        p_eui64->e8[0] = (eth_addr.ether_addr_octet[0] & 0xFF) | 0x02;
        p_eui64->e8[1] = (eth_addr.ether_addr_octet[1] & 0xFF);
        p_eui64->e8[2] = (eth_addr.ether_addr_octet[2] & 0xFF);
        p_eui64->e8[3] = 0xFF;
        p_eui64->e8[4] = 0xFE;
        p_eui64->e8[5] = (eth_addr.ether_addr_octet[3] & 0xFF);
        p_eui64->e8[6] = (eth_addr.ether_addr_octet[4] & 0xFF);
        p_eui64->e8[7] = (eth_addr.ether_addr_octet[5] & 0xFF);
        return (1);
}
#endif /* INET6 */

struct bit_ent {
        int val;
        char *off, *on;
};

/* see sbuf[] below if you change this list */
static struct bit_ent bit_list[] = {
        { TIOCM_DTR, "dtr", "DTR" },
        { TIOCM_RTS, "rts", "RTS" },
        { TIOCM_CTS, "cts", "CTS" },
        { TIOCM_CD, "dcd", "DCD" },
        { TIOCM_RI, "ri", "RI" },
        { TIOCM_DSR, "dsr", "DSR" },
#if 0
        { TIOCM_LE, "disabled", "ENABLED" },
        { TIOCM_ST, NULL, "2nd-XMIT" },
        { TIOCM_SR, NULL, "2nd-RECV" },
#endif
        { 0, NULL, NULL }
};

static void
getbits(int fd, char *name, FILE *strptr)
{
        int nmods, i;
        struct str_list strlist;
        struct bit_ent *be;
        int mstate;
        char sbuf[50];          /* sum of string lengths in bit_list */
        char *str;

        nmods = ioctl(fd, I_LIST, NULL);
        if (nmods < 0) {
                error("unable to get module count: %m");
        } else {
                strlist.sl_nmods = nmods;
                strlist.sl_modlist = malloc(sizeof (struct str_mlist) * nmods);
                if (strlist.sl_modlist == NULL)
                        novm("module list");
                if (ioctl(fd, I_LIST, (caddr_t)&strlist) < 0) {
                        error("unable to get module names: %m");
                } else {
                        for (i = 0; i < strlist.sl_nmods; i++)
                                (void) flprintf(strptr, "%d: %s", i,
                                    strlist.sl_modlist[i].l_name);
                        free(strlist.sl_modlist);
                }
        }
        if (ioctl(fd, TIOCMGET, &mstate) < 0) {
                error("unable to get modem state: %m");
        } else {
                sbuf[0] = '\0';
                for (be = bit_list; be->val != 0; be++) {
                        str = (be->val & mstate) ? be->on : be->off;
                        if (str != NULL) {
                                if (sbuf[0] != '\0')
                                        (void) strcat(sbuf, " ");
                                (void) strcat(sbuf, str);
                        }
                }
                (void) flprintf(strptr, "%s: %s\n", name, sbuf);
        }
}

/*
 * Print state of serial link.  The stream might be linked under the
 * /dev/sppp driver.  If it is, then it's necessary to unlink it first
 * and relink it when done.  Otherwise, it's not possible to use
 * ioctl() on the stream.
 */
void
sys_print_state(FILE *strptr)
{
        bool was_linked;

        if (pppfd == -1)
                return;
        if (ttyfd == -1) {
                (void) flprintf(strptr, "serial link is not active");
                return;
        }
        was_linked = fdmuxid != -1;
        if (was_linked && ioctl(pppfd, I_UNLINK, fdmuxid) == -1) {
                error("I_UNLINK: %m");
        } else {
                fdmuxid = -1;
                getbits(ttyfd, devnam, strptr);
                if (was_linked &&
                    (fdmuxid = ioctl(pppfd, I_LINK, (void *)ttyfd)) == -1)
                        fatal("I_LINK: %m");
        }
}

/*
 * send ioctl to driver asking it to block packets with network protocol
 * proto in the control queue until the queue for proto is plumbed.
 */
void
sys_block_proto(uint16_t proto)
{
        if (proto > 0x7fff) {
                warn("cannot block: not a network proto 0x%lx\n", proto);
                return;
        }
        if (strioctl(pppfd, PPPIO_BLOCKNP, &proto, sizeof (proto), 0) < 0) {
                warn("PPPIO_BLOCKNP ioctl failed %m");
        }
}
/*
 * send ioctl to driver asking it to release packets with network protocol
 * proto from control queue to the protocol specific queue.
 */
void
sys_unblock_proto(uint16_t proto)
{
        if (proto > 0x7fff) {
                warn("cannot unblock: not a network proto 0x%lx\n", proto);
                return;
        }
        if (strioctl(pppfd, PPPIO_UNBLOCKNP, &proto, sizeof (proto), 0) < 0) {
                warn("PPPIO_UNBLOCKNP ioctl failed %m");
        }
}