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/*

 * Copyright (c) 1980, 1986, 1993

 *      The Regents of the University of California.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *      This product includes software developed by the University of

 *      California, Berkeley and its contributors.

 * 4. Neither the name of the University nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 *

 *      @(#)if.c        8.3 (Berkeley) 1/4/94

 * $Id: if.c,v 1.2 2001-09-27 12:01:54 chris Exp $

 */

#include <sys/param.h>

#include <sys/queue.h>

#include <sys/mbuf.h>

#include <sys/systm.h>

#include <sys/proc.h>

#include <sys/socket.h>

#include <sys/socketvar.h>

#include <sys/protosw.h>

#include <sys/kernel.h>

#include <sys/ioctl.h>

#include <sys/errno.h>

#include <sys/syslog.h>

#include <sys/sysctl.h>

#include <net/if.h>

#include <net/if_dl.h>

#include <net/if_types.h>

#include <net/radix.h>

/*

 * System initialization

 */

static int ifconf __P((int, caddr_t));

       void ifinit __P((void *));

static void if_qflush __P((struct ifqueue *));

static void if_slowtimo __P((void *));

static void link_rtrequest __P((int, struct rtentry *, struct sockaddr *));

SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)

int     ifqmaxlen = IFQ_MAXLEN;

struct  ifnet *ifnet;

/*

 * Network interface utility routines.

 *

 * Routines with ifa_ifwith* names take sockaddr *'s as

 * parameters.

 *

 * This routine assumes that it will be called at splimp() or higher.

 */

/* ARGSUSED*/

void

ifinit(dummy)

        void *dummy;

{

        register struct ifnet *ifp;

        for (ifp = ifnet; ifp; ifp = ifp->if_next)

                if (ifp->if_snd.ifq_maxlen == 0)

                        ifp->if_snd.ifq_maxlen = ifqmaxlen;

        if_slowtimo(0);

}

int if_index = 0;

struct ifaddr **ifnet_addrs;

/*

 * Attach an interface to the

 * list of "active" interfaces.

 */

void

if_attach(ifp)

        struct ifnet *ifp;

{

        unsigned socksize, ifasize;

        int namelen, masklen;

        char workbuf[64];

        register struct ifnet **p = &ifnet;

        register struct sockaddr_dl *sdl;

        register struct ifaddr *ifa;

        static int if_indexlim = 8;

        while (*p)

                p = &((*p)->if_next);

        *p = ifp;

        ifp->if_index = ++if_index;

        microtime(&ifp->if_lastchange);

        if (ifnet_addrs == 0 || if_index >= if_indexlim) {

                unsigned n = (if_indexlim <<= 1) * sizeof(ifa);

                struct ifaddr **q = (struct ifaddr **)

                                        malloc(n, M_IFADDR, M_WAITOK);

                bzero((caddr_t)q, n);

                if (ifnet_addrs) {

                        bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);

                        free((caddr_t)ifnet_addrs, M_IFADDR);

                }

                ifnet_addrs = q;

        }

        /*

         * create a Link Level name for this device

         */

        namelen = sprintf(workbuf, "%s%d", ifp->if_name, ifp->if_unit);

#define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))

        masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;

        socksize = masklen + ifp->if_addrlen;

#define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))

        socksize = ROUNDUP(socksize);

        if (socksize < sizeof(*sdl))

                socksize = sizeof(*sdl);

        ifasize = sizeof(*ifa) + 2 * socksize;

        ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK);

        if (ifa) {

                bzero((caddr_t)ifa, ifasize);

                sdl = (struct sockaddr_dl *)(ifa + 1);

                sdl->sdl_len = socksize;

                sdl->sdl_family = AF_LINK;

                bcopy(workbuf, sdl->sdl_data, namelen);

                sdl->sdl_nlen = namelen;

                sdl->sdl_index = ifp->if_index;

                sdl->sdl_type = ifp->if_type;

                ifnet_addrs[if_index - 1] = ifa;

                ifa->ifa_ifp = ifp;

                ifa->ifa_next = ifp->if_addrlist;

                ifa->ifa_rtrequest = link_rtrequest;

                ifp->if_addrlist = ifa;

                ifa->ifa_addr = (struct sockaddr *)sdl;

                sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);

                ifa->ifa_netmask = (struct sockaddr *)sdl;

                sdl->sdl_len = masklen;

                while (namelen != 0)

                        sdl->sdl_data[--namelen] = 0xff;

        }

}

/*

 * Locate an interface based on a complete address.

 */

/*ARGSUSED*/

struct ifaddr *

ifa_ifwithaddr(addr)

        register struct sockaddr *addr;

{

        register struct ifnet *ifp;

        register struct ifaddr *ifa;

#define equal(a1, a2) \

  (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)

        for (ifp = ifnet; ifp; ifp = ifp->if_next)

            for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {

                if (ifa->ifa_addr->sa_family != addr->sa_family)

                        continue;

                if (equal(addr, ifa->ifa_addr))

                        return (ifa);

                if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&

                    equal(ifa->ifa_broadaddr, addr))

                        return (ifa);

        }

        return ((struct ifaddr *)0);

}

/*

 * Locate the point to point interface with a given destination address.

 */

/*ARGSUSED*/

struct ifaddr *

ifa_ifwithdstaddr(addr)

        register struct sockaddr *addr;

{

        register struct ifnet *ifp;

        register struct ifaddr *ifa;

        for (ifp = ifnet; ifp; ifp = ifp->if_next)

            if (ifp->if_flags & IFF_POINTOPOINT)

                for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {

                        if (ifa->ifa_addr->sa_family != addr->sa_family)

                                continue;

                        if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))

                                return (ifa);

        }

        return ((struct ifaddr *)0);

}

/*

 * Find an interface on a specific network.  If many, choice

 * is most specific found.

 */

struct ifaddr *

ifa_ifwithnet(addr)

        struct sockaddr *addr;

{

        register struct ifnet *ifp;

        register struct ifaddr *ifa;

        struct ifaddr *ifa_maybe = (struct ifaddr *) 0;

        u_int af = addr->sa_family;

        char *addr_data = addr->sa_data, *cplim;

        if (af == AF_LINK) {

            register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;

            if (sdl->sdl_index && sdl->sdl_index <= if_index)

                return (ifnet_addrs[sdl->sdl_index - 1]);

        }

        for (ifp = ifnet; ifp; ifp = ifp->if_next) {

                for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {

                        register char *cp, *cp2, *cp3;

                        if (ifa->ifa_addr->sa_family != af)

                                next: continue;

                        if (ifp->if_flags & IFF_POINTOPOINT) {

                                if (ifa->ifa_dstaddr != 0

                                    && equal(addr, ifa->ifa_dstaddr))

                                        return (ifa);

                        } else {

                                /*

                                 * if we have a special address handler,

                                 * then use it instead of the generic one.

                                 */

                                if (ifa->ifa_claim_addr) {

                                        if ((*ifa->ifa_claim_addr)(ifa, addr)) {

                                                return (ifa);

                                        } else {

                                                continue;

                                        }

                                }

                                /*

                                 * Scan all the bits in the ifa's address.

                                 * If a bit dissagrees with what we are

                                 * looking for, mask it with the netmask

                                 * to see if it really matters.

                                 * (A byte at a time)

                                 */

                                if (ifa->ifa_netmask == 0)

                                        continue;

                                cp = addr_data;

                                cp2 = ifa->ifa_addr->sa_data;

                                cp3 = ifa->ifa_netmask->sa_data;

                                cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;

                                while (cp3 < cplim)

                                        if ((*cp++ ^ *cp2++) & *cp3++)

                                                goto next;

                                if (ifa_maybe == 0 ||

                                    rn_refines((caddr_t)ifa->ifa_netmask,

                                    (caddr_t)ifa_maybe->ifa_netmask))

                                        ifa_maybe = ifa;

                        }

                }

        }

        return (ifa_maybe);

}

/*

 * Find an interface address specific to an interface best matching

 * a given address.

 */

struct ifaddr *

ifaof_ifpforaddr(addr, ifp)

        struct sockaddr *addr;

        register struct ifnet *ifp;

{

        register struct ifaddr *ifa;

        register char *cp, *cp2, *cp3;

        register char *cplim;

        struct ifaddr *ifa_maybe = 0;

        u_int af = addr->sa_family;

        if (af >= AF_MAX)

                return (0);

        for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {

                if (ifa->ifa_addr->sa_family != af)

                        continue;

                if (ifa_maybe == 0)

                        ifa_maybe = ifa;

                if (ifa->ifa_netmask == 0) {

                        if (equal(addr, ifa->ifa_addr) ||

                            (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))

                                return (ifa);

                        continue;

                }

                if (ifp->if_flags & IFF_POINTOPOINT) {

                        if (equal(addr, ifa->ifa_dstaddr))

                                return (ifa);

                } else {

                        cp = addr->sa_data;

                        cp2 = ifa->ifa_addr->sa_data;

                        cp3 = ifa->ifa_netmask->sa_data;

                        cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;

                        for (; cp3 < cplim; cp3++)

                                if ((*cp++ ^ *cp2++) & *cp3)

                                        break;

                        if (cp3 == cplim)

                                return (ifa);

                }

        }

        return (ifa_maybe);

}

#include <net/route.h>

/*

 * Default action when installing a route with a Link Level gateway.

 * Lookup an appropriate real ifa to point to.

 * This should be moved to /sys/net/link.c eventually.

 */

static void

link_rtrequest(cmd, rt, sa)

        int cmd;

        register struct rtentry *rt;

        struct sockaddr *sa;

{

        register struct ifaddr *ifa;

        struct sockaddr *dst;

        struct ifnet *ifp;

        if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||

            ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))

                return;

        ifa = ifaof_ifpforaddr(dst, ifp);

        if (ifa) {

                IFAFREE(rt->rt_ifa);

                rt->rt_ifa = ifa;

                ifa->ifa_refcnt++;

                if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)

                        ifa->ifa_rtrequest(cmd, rt, sa);

        }

}

/*

 * Mark an interface down and notify protocols of

 * the transition.

 * NOTE: must be called at splnet or eqivalent.

 */

void

if_down(ifp)

        register struct ifnet *ifp;

{

        register struct ifaddr *ifa;

        ifp->if_flags &= ~IFF_UP;

        microtime(&ifp->if_lastchange);

        for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)

                pfctlinput(PRC_IFDOWN, ifa->ifa_addr);

        if_qflush(&ifp->if_snd);

        rt_ifmsg(ifp);

}

/*

 * Mark an interface up and notify protocols of

 * the transition.

 * NOTE: must be called at splnet or eqivalent.

 */

void

if_up(ifp)

        register struct ifnet *ifp;

{

        ifp->if_flags |= IFF_UP;

        microtime(&ifp->if_lastchange);

#ifdef notyet

        register struct ifaddr *ifa;

        /* this has no effect on IP, and will kill all iso connections XXX */

        for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)

                pfctlinput(PRC_IFUP, ifa->ifa_addr);

#endif

        rt_ifmsg(ifp);

}

/*

 * Flush an interface queue.

 */

static void

if_qflush(ifq)

        register struct ifqueue *ifq;

{

        register struct mbuf *m, *n;

        n = ifq->ifq_head;

        while ((m = n) != 0) {

                n = m->m_act;

                m_freem(m);

        }

        ifq->ifq_head = 0;

        ifq->ifq_tail = 0;

        ifq->ifq_len = 0;

}

/*

 * Handle interface watchdog timer routines.  Called

 * from softclock, we decrement timers (if set) and

 * call the appropriate interface routine on expiration.

 */

static void

if_slowtimo(arg)

        void *arg;

{

        register struct ifnet *ifp;

        int s = splimp();

        for (ifp = ifnet; ifp; ifp = ifp->if_next) {

                if (ifp->if_timer == 0 || --ifp->if_timer)

                        continue;

                if (ifp->if_watchdog)

                        (*ifp->if_watchdog)(ifp);

        }

        splx(s);

        timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);

}

/*

 * Map interface name to

 * interface structure pointer.

 */

struct ifnet *

ifunit(name)

        register char *name;

{

        register char *cp;

        register struct ifnet *ifp;

        int unit;

        unsigned len;

        char *ep, c;

        for (cp = name; cp < name + IFNAMSIZ && *cp; cp++)

                if (*cp >= '0' && *cp <= '9')

                        break;

        if (*cp == '\0' || cp == name + IFNAMSIZ)

                return ((struct ifnet *)0);

        /*

         * Save first char of unit, and pointer to it,

         * so we can put a null there to avoid matching

         * initial substrings of interface names.

         */

        len = cp - name + 1;

        c = *cp;

        ep = cp;

        for (unit = 0; *cp >= '0' && *cp <= '9'; )

                unit = unit * 10 + *cp++ - '0';

        if (*cp != '\0')

                return 0;        /* no trailing garbage allowed */

        *ep = 0;

        for (ifp = ifnet; ifp; ifp = ifp->if_next) {

                if (bcmp(ifp->if_name, name, len))

                        continue;

                if (unit == ifp->if_unit)

                        break;

        }

        *ep = c;

        return (ifp);

}

/*

 * Interface ioctls.

 */

int

ifioctl(so, cmd, data, p)

        struct socket *so;

        int cmd;

        caddr_t data;

        struct proc *p;

{

        register struct ifnet *ifp;

        register struct ifreq *ifr;

        int error;

        switch (cmd) {

        case SIOCGIFCONF:

        case OSIOCGIFCONF:

                return (ifconf(cmd, data));

        }

        ifr = (struct ifreq *)data;

        ifp = ifunit(ifr->ifr_name);

        if (ifp == 0)

                return (ENXIO);

        switch (cmd) {

        case SIOCGIFFLAGS:

                ifr->ifr_flags = ifp->if_flags;

                break;

        case SIOCGIFMETRIC:

                ifr->ifr_metric = ifp->if_metric;

                break;

        case SIOCGIFMTU:

                ifr->ifr_mtu = ifp->if_mtu;

                break;

        case SIOCGIFPHYS:

                ifr->ifr_phys = ifp->if_physical;

                break;

        case SIOCSIFFLAGS:

                error = suser(p->p_ucred, &p->p_acflag);

                if (error)

                        return (error);

                if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {

                        int s = splimp();

                        if_down(ifp);

                        splx(s);

                }

                if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) {

                        int s = splimp();

                        if_up(ifp);

                        splx(s);

                }

                ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |

                        (ifr->ifr_flags &~ IFF_CANTCHANGE);

                if (ifp->if_ioctl)

                        (void) (*ifp->if_ioctl)(ifp, cmd, data);

                microtime(&ifp->if_lastchange);

                break;

        case SIOCSIFMETRIC:

                error = suser(p->p_ucred, &p->p_acflag);

                if (error)

                        return (error);

                ifp->if_metric = ifr->ifr_metric;

                microtime(&ifp->if_lastchange);

                break;

        case SIOCSIFPHYS:

                error = suser(p->p_ucred, &p->p_acflag);

                if (error)

                        return error;

                if (!ifp->if_ioctl)

                        return EOPNOTSUPP;

                error = (*ifp->if_ioctl)(ifp, cmd, data);

                if (error == 0)

                        microtime(&ifp->if_lastchange);

                return(error);

        case SIOCSIFMTU:

                error = suser(p->p_ucred, &p->p_acflag);

                if (error)

                        return (error);

                if (ifp->if_ioctl == NULL)

                        return (EOPNOTSUPP);

                /*

                 * 72 was chosen below because it is the size of a TCP/IP

                 * header (40) + the minimum mss (32).

                 */

                if (ifr->ifr_mtu < 72 || ifr->ifr_mtu > 65535)

                        return (EINVAL);

                error = (*ifp->if_ioctl)(ifp, cmd, data);

                if (error == 0)

                        microtime(&ifp->if_lastchange);

                return(error);

        case SIOCADDMULTI:

        case SIOCDELMULTI:

                error = suser(p->p_ucred, &p->p_acflag);

                if (error)

                        return (error);

                if (ifp->if_ioctl == NULL)

                        return (EOPNOTSUPP);

                error = (*ifp->if_ioctl)(ifp, cmd, data);

                if (error == 0 )

                        microtime(&ifp->if_lastchange);

                return(error);

        case SIOCSIFMEDIA:

                error = suser(p->p_ucred, &p->p_acflag);

                if (error)

                        return (error);

                if (ifp->if_ioctl == 0)

                        return (EOPNOTSUPP);

                error = (*ifp->if_ioctl)(ifp, cmd, data);

                if (error == 0)

                        microtime(&ifp->if_lastchange);

                return error;

        case SIOCGIFMEDIA:

                if (ifp->if_ioctl == 0)

                        return (EOPNOTSUPP);

                return ((*ifp->if_ioctl)(ifp, cmd, data));

        default:

                if (so->so_proto == 0)

                        return (EOPNOTSUPP);

#ifndef COMPAT_43

                return ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,

                                                                 data,

                                                                 ifp));

#else

            {

                int ocmd = cmd;

                switch (cmd) {

                case SIOCSIFDSTADDR:

                case SIOCSIFADDR:

                case SIOCSIFBRDADDR:

                case SIOCSIFNETMASK:

#if BYTE_ORDER != BIG_ENDIAN

                        if (ifr->ifr_addr.sa_family == 0 &&

                            ifr->ifr_addr.sa_len < 16) {

                                ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;

                                ifr->ifr_addr.sa_len = 16;

                        }

#else

                        if (ifr->ifr_addr.sa_len == 0)

                                ifr->ifr_addr.sa_len = 16;

#endif

                        break;

                case OSIOCGIFADDR:

                        cmd = SIOCGIFADDR;

                        break;

                case OSIOCGIFDSTADDR:

                        cmd = SIOCGIFDSTADDR;

                        break;

                case OSIOCGIFBRDADDR:

                        cmd = SIOCGIFBRDADDR;

                        break;

                case OSIOCGIFNETMASK: