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//==========================================================================
//
//      src/sys/net/if.c
//
//==========================================================================
// ####BSDCOPYRIGHTBEGIN####                                    
// -------------------------------------------                  
// This file is part of eCos, the Embedded Configurable Operating System.
//
// Portions of this software may have been derived from FreeBSD 
// or other sources, and if so are covered by the appropriate copyright
// and license included herein.                                 
//
// Portions created by the Free Software Foundation are         
// Copyright (C) 2002 Free Software Foundation, Inc.            
// -------------------------------------------                  
// ####BSDCOPYRIGHTEND####                                      
//==========================================================================
 
/*
 * 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
 * $FreeBSD: src/sys/net/if.c,v 1.85.2.9 2001/07/24 19:10:17 brooks Exp $
 */
 
#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
 
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/radix.h>
#include <net/route.h>
 
#if defined(INET) || defined(INET6)
/*XXX*/
#include <netinet/in.h>
#include <netinet/in_var.h>
#ifdef INET6
#include <netinet6/in6_var.h>
#include <netinet6/in6_ifattach.h>
#endif
#endif
 
/*
 * System initialization
 */
 
static int ifconf __P((u_long, caddr_t));
static 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 *));
static int  if_rtdel __P((struct radix_node *, void *));
 
SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
 
int     ifqmaxlen = IFQ_MAXLEN;
struct  ifnethead ifnet;        /* depend on static init XXX */
 
#ifdef INET6
/*
 * XXX: declare here to avoid to include many inet6 related files..
 * should be more generalized?
 */
extern void     nd6_setmtu __P((struct ifnet *));
#endif
 
struct if_clone *if_clone_lookup __P((const char *, int *));
int if_clone_list __P((struct if_clonereq *));
 
LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
int if_cloners_count;
 
/*
 * Network interface utility routines.
 *
 * Routines with ifa_ifwith* names take sockaddr *'s as
 * parameters.
 */
/* ARGSUSED*/
void
ifinit(dummy)
        void *dummy;
{
#ifdef DEBUG_IFINIT
        struct ifnet *ifp;
        int s;
 
        s = splimp();
        for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
            log(LOG_INIT, "IFP: %p, next: %p\n", ifp, ifp->if_link.tqe_next);
        }
        splx(s);
#endif
        if_slowtimo(0);
}
 
int if_index = 0;
struct ifaddr **ifnet_addrs;
struct ifnet **ifindex2ifnet = NULL;
 
char *
_sa(struct ifaddr *ifa)
{
    struct sockaddr *sa = ifa->ifa_addr;
    static char _unknown[128];
 
    switch (sa->sa_family) {
    case AF_INET:
        return inet_ntoa((struct in_addr)((struct sockaddr_in *)(ifa->ifa_addr))->sin_addr);
#ifdef INET6
    case AF_INET6:
        diag_sprintf(_unknown, "%s/%d", ip6_sprintf(IFA_IN6(ifa)),
                     in6_mask2len(&((struct in6_ifaddr *)ifa)->ia_prefixmask.sin6_addr, NULL));
        return _unknown;
#endif
    case AF_LINK:
        diag_sprintf(_unknown, "<<%p>>", sa);
        return _unknown;
    default:
        diag_sprintf(_unknown, "[%d]", sa->sa_family);
        return _unknown;
    }
}
 
void
_show_ifp(struct ifnet *ifp)
{
    log_(LOG_ADDR) {
        struct ifaddr *ifa;
        diag_printf("IFP: %p (%s%d)\n", ifp, ifp->if_name, ifp->if_unit);
        TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
            diag_printf("IFA: %p - %s\n", ifa, _sa(ifa));
        }
    }
}
 
/*
 * 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 sockaddr_dl *sdl;
        register struct ifaddr *ifa;
        static int if_indexlim = 8;
        static int inited;
 
        if (!inited) {
                TAILQ_INIT(&ifnet);
                inited = 1;
        }
 
        if (ifp->if_snd.ifq_maxlen == 0) {
            ifp->if_snd.ifq_maxlen = ifqmaxlen;
        }
 
        TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
        ifp->if_index = ++if_index;
        /*
         * XXX -
         * The old code would work if the interface passed a pre-existing
         * chain of ifaddrs to this code.  We don't trust our callers to
         * properly initialize the tailq, however, so we no longer allow
         * this unlikely case.
         */
        TAILQ_INIT(&ifp->if_addrhead);
        log_(LOG_ADDR) {
            diag_printf("%s.%d - After initialize list %p\n",
                        __FUNCTION__, __LINE__,
                        &ifp->if_addrlist);
            _show_ifp(ifp);
        }
        TAILQ_INIT(&ifp->if_prefixhead);
        LIST_INIT(&ifp->if_multiaddrs);
        getmicrotime(&ifp->if_lastchange);
        if (ifnet_addrs == 0 || if_index >= if_indexlim) {
                unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
                caddr_t q = malloc(n, M_IFADDR, M_WAITOK);
                bzero(q, n);
                if (ifnet_addrs) {
                        bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);
                        free((caddr_t)ifnet_addrs, M_IFADDR);
                }
                ifnet_addrs = (struct ifaddr **)q;
 
                /* grow ifindex2ifnet */
                n = if_indexlim * sizeof(struct ifnet *);
                q = malloc(n, M_IFADDR, M_WAITOK);
                bzero(q, n);
                if (ifindex2ifnet) {
                        bcopy((caddr_t)ifindex2ifnet, q, n/2);
                        free((caddr_t)ifindex2ifnet, M_IFADDR);
                }
                ifindex2ifnet = (struct ifnet **)q;
        }
 
        ifindex2ifnet[if_index] = ifp;
 
        /*
         * create a Link Level name for this device
         */
        namelen = snprintf(workbuf, sizeof(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)))
        if (socksize < sizeof(*sdl))
                socksize = sizeof(*sdl);
        socksize = ROUNDUP(socksize);
        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_rtrequest = link_rtrequest;
                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;
                TAILQ_INSERT_HEAD(&ifp->if_addrhead, ifa, ifa_link);
                log_(LOG_ADDR) {
                    diag_printf("%s.%d - After inserting %p into list %p\n",
                                __FUNCTION__, __LINE__,
                                ifa, &ifp->if_addrlist);
                    _show_ifp(ifp);
                }
        }
#ifdef ALTQ
        ifp->if_snd.altq_type = 0;
        ifp->if_snd.altq_disc = NULL;
        ifp->if_snd.altq_flags &= ALTQF_CANTCHANGE;
        ifp->if_snd.altq_tbr  = NULL;
        ifp->if_snd.altq_ifp  = ifp;
#endif
}
 
/*
 * Detach an interface, removing it from the
 * list of "active" interfaces.
 */
void
if_detach(ifp)
        struct ifnet *ifp;
{
        struct ifaddr *ifa;
        struct radix_node_head  *rnh;
        int s;
        int i;
 
        /*
         * Remove routes and flush queues.
         */
        s = splnet();
        if_down(ifp);
#ifdef ALTQ
        if (ALTQ_IS_ENABLED(&ifp->if_snd))
                altq_disable(&ifp->if_snd);
        if (ALTQ_IS_ATTACHED(&ifp->if_snd))
                altq_detach(&ifp->if_snd);
#endif
 
        /*
         * Remove address from ifnet_addrs[] and maybe decrement if_index.
         * Clean up all addresses.
         */
        ifnet_addrs[ifp->if_index - 1] = 0;
        while (if_index > 0 && ifnet_addrs[if_index - 1] == 0)
                if_index--;
 
        for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa;
             ifa = TAILQ_FIRST(&ifp->if_addrhead)) {
#ifdef INET
                /* XXX: Ugly!! ad hoc just for INET */
                if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
                        struct ifaliasreq ifr;
 
                        bzero(&ifr, sizeof(ifr));
                        ifr.ifra_addr = *ifa->ifa_addr;
                        if (ifa->ifa_dstaddr)
                                ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
                        if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
                            NULL) == 0)
                                continue;
                }
#endif /* INET */
#ifdef INET6
                if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
                        in6_purgeaddr(ifa);
                        /* ifp_addrhead is already updated */
                        continue;
                }
#endif /* INET6 */
                TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link);
                IFAFREE(ifa);
        }
 
#ifdef INET6
        /*
         * Remove all IPv6 kernel structs related to ifp.  This should be done
         * before removing routing entries below, since IPv6 interface direct
         * routes are expected to be removed by the IPv6-specific kernel API.
         * Otherwise, the kernel will detect some inconsistency and bark it.
         */
        in6_ifdetach(ifp);
#endif
 
        /*
         * Delete all remaining routes using this interface
         * Unfortuneatly the only way to do this is to slog through
         * the entire routing table looking for routes which point
         * to this interface...oh well...
         */
        for (i = 1; i <= AF_MAX; i++) {
                if ((rnh = rt_tables[i]) == NULL)
                        continue;
                (void) rnh->rnh_walktree(rnh, if_rtdel, ifp);
        }
 
        TAILQ_REMOVE(&ifnet, ifp, if_link);
        splx(s);
}
 
/*
 * Delete Routes for a Network Interface
 *
 * Called for each routing entry via the rnh->rnh_walktree() call above
 * to delete all route entries referencing a detaching network interface.
 *
 * Arguments:
 *      rn      pointer to node in the routing table
 *      arg     argument passed to rnh->rnh_walktree() - detaching interface
 *
 * Returns:
 *      0        successful
 *      errno   failed - reason indicated
 *
 */
static int
if_rtdel(rn, arg)
        struct radix_node       *rn;
        void                    *arg;
{
        struct rtentry  *rt = (struct rtentry *)rn;
        struct ifnet    *ifp = arg;
        int             err;
 
        if (rt->rt_ifp == ifp) {
 
                /*
                 * Protect (sorta) against walktree recursion problems
                 * with cloned routes
                 */
                if ((rt->rt_flags & RTF_UP) == 0)
                        return (0);
 
                err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
                                rt_mask(rt), rt->rt_flags,
                                (struct rtentry **) NULL);
                if (err) {
                        log(LOG_WARNING, "if_rtdel: error %d\n", err);
                }
        }
 
        return (0);
}
 
/*
 * Create a clone network interface.
 */
int
if_clone_create(name, len)
        char *name;
        int len;
{
        struct if_clone *ifc;
        char *dp;
        int wildcard;
        int unit;
        int err;
 
        ifc = if_clone_lookup(name, &unit);
        if (ifc == NULL)
                return (EINVAL);
 
        if (ifunit(name) != NULL)
                return (EEXIST);
 
        wildcard = (unit < 0);
 
        err = (*ifc->ifc_create)(ifc, &unit);
        if (err != 0)
                return (err);
 
        /* In the wildcard case, we need to update the name. */
        if (wildcard) {
                for (dp = name; *dp != '\0'; dp++);
                if (snprintf(dp, len - (dp-name), "%d", unit) >
                    len - (dp-name) - 1) {
                        /*
                         * This can only be a programmer error and
                         * there's no straightforward way to recover if
                         * it happens.
                         */
                        panic("if_clone_create(): interface name too long");
                }
 
        }
 
        return (0);
}
 
/*
 * Destroy a clone network interface.
 */
int
if_clone_destroy(name)
        const char *name;
{
        struct if_clone *ifc;
        struct ifnet *ifp;
 
        ifc = if_clone_lookup(name, NULL);
        if (ifc == NULL)
                return (EINVAL);
 
        ifp = ifunit(name);
        if (ifp == NULL)
                return (ENXIO);
 
        if (ifc->ifc_destroy == NULL)
                return (EOPNOTSUPP);
 
        (*ifc->ifc_destroy)(ifp);
        return (0);
}
 
/*
 * Look up a network interface cloner.
 */
struct if_clone *
if_clone_lookup(name, unitp)
        const char *name;
        int *unitp;
{
        struct if_clone *ifc;
        const char *cp;
        int i;
 
        for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
                for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
                        if (ifc->ifc_name[i] != *cp)
                                goto next_ifc;
                }
                goto found_name;
 next_ifc:
                ifc = LIST_NEXT(ifc, ifc_list);
        }
 
        /* No match. */
        return ((struct if_clone *)NULL);
 
 found_name:
        if (*cp == '\0') {
                i = -1;
        } else {
                for (i = 0; *cp != '\0'; cp++) {
                        if (*cp < '0' || *cp > '9') {
                                /* Bogus unit number. */
                                return (NULL);
                        }
                        i = (i * 10) + (*cp - '0');
                }
        }
 
        if (unitp != NULL)
                *unitp = i;
        return (ifc);
}
 
/*
 * Register a network interface cloner.
 */
void
if_clone_attach(ifc)
        struct if_clone *ifc;
{
 
        LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
        if_cloners_count++;
}
 
/*
 * Unregister a network interface cloner.
 */
void
if_clone_detach(ifc)
        struct if_clone *ifc;
{
 
        LIST_REMOVE(ifc, ifc_list);
        if_cloners_count--;
}
 
/*
 * Provide list of interface cloners to userspace.
 */
int
if_clone_list(ifcr)
        struct if_clonereq *ifcr;
{
        char outbuf[IFNAMSIZ], *dst;
        struct if_clone *ifc;
        int count, error = 0;
 
        ifcr->ifcr_total = if_cloners_count;
        if ((dst = ifcr->ifcr_buffer) == NULL) {
                /* Just asking how many there are. */
                return (0);
        }
 
        if (ifcr->ifcr_count < 0)
                return (EINVAL);
 
        count = (if_cloners_count < ifcr->ifcr_count) ?
            if_cloners_count : ifcr->ifcr_count;
 
        for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
             ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
                strncpy(outbuf, ifc->ifc_name, IFNAMSIZ);
                outbuf[IFNAMSIZ - 1] = '\0';    /* sanity */
                error = copyout(outbuf, dst, IFNAMSIZ);
                if (error)
                        break;
        }
 
        return (error);
}
 
/*
 * 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.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
            for (ifa = ifp->if_addrhead.tqh_first; ifa;
                 ifa = ifa->ifa_link.tqe_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 &&
                    /* IP6 doesn't have broadcast */
                    ifa->ifa_broadaddr->sa_len != 0 &&
                    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.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
            if (ifp->if_flags & IFF_POINTOPOINT)
                for (ifa = ifp->if_addrhead.tqh_first; ifa;
                     ifa = ifa->ifa_link.tqe_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;
 
        /*
         * AF_LINK addresses can be looked up directly by their index number,
         * so do that if we can.
         */
        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]);
        }
 
        /*
         * Scan though each interface, looking for ones that have
         * addresses in this address family.
         */
        for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
                for (ifa = ifp->if_addrhead.tqh_first; ifa;
                     ifa = ifa->ifa_link.tqe_next) {
                        register char *cp, *cp2, *cp3;
 
                        if (ifa->ifa_addr->sa_family != af)
next:                           continue;
                        if (
#ifdef INET6 /* XXX: for maching gif tunnel dst as routing entry gateway */
                            addr->sa_family != AF_INET6 &&
#endif
                            ifp->if_flags & IFF_POINTOPOINT) {
                                /*
                                 * This is a bit broken as it doesn't
                                 * take into account that the remote end may
                                 * be a single node in the network we are
                                 * looking for.
                                 * The trouble is that we don't know the
                                 * netmask for the remote end.
                                 */
                                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; /* next address! */
                                /*
                                 * If the netmask of what we just found
                                 * is more specific than what we had before
                                 * (if we had one) then remember the new one
                                 * before continuing to search
                                 * for an even better one.
                                 */
                                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_addrhead.tqh_first; ifa;
             ifa = ifa->ifa_link.tqe_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);
}
 
/*
 * 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_unroute(ifp, flag, fam)
        register struct ifnet *ifp;
        int flag, fam;
{
        register struct ifaddr *ifa;
 
        ifp->if_flags &= ~flag;
        getmicrotime(&ifp->if_lastchange);
        TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
                if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
                        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_route(ifp, flag, fam)
        register struct ifnet *ifp;
        int flag, fam;
{
        register struct ifaddr *ifa;
 
        ifp->if_flags |= flag;
        getmicrotime(&ifp->if_lastchange);
        TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
                if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
                        pfctlinput(PRC_IFUP, ifa->ifa_addr);
        rt_ifmsg(ifp);
#ifdef INET6
        in6_if_up(ifp);
#endif
}
 
/*
 * 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;
{
 
        if_unroute(ifp, IFF_UP, AF_UNSPEC);
}
 
/*
 * 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;
{
 
        if_route(ifp, IFF_UP, AF_UNSPEC);
}
 
/*
 * Flush an interface queue.
 */
static void
if_qflush(ifq)
#ifdef ALTQ
        struct ifaltq *ifq;
#else
        register struct ifqueue *ifq;
#endif
{
        register struct mbuf *m, *n;
 
#ifdef ALTQ
        if (ALTQ_IS_ENABLED(ifq))
                ALTQ_PURGE(ifq);
#endif
        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.tqh_first; ifp; ifp = ifp->if_link.tqe_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(const char *name)
{
        char namebuf[IFNAMSIZ + 1];
        const char *cp;
        struct ifnet *ifp;
        int unit;
        unsigned len, m;
        char c;
 
        len = strlen(name);
        if (len < 2 || len > IFNAMSIZ)
                return NULL;
        cp = name + len - 1;
        c = *cp;
        if (c < '0' || c > '9')
                return NULL;            /* trailing garbage */
        unit = 0;
        m = 1;
        do {
                if (cp == name)
                        return NULL;    /* no interface name */
                unit += (c - '0') * m;
                if (unit > 1000000)
                        return NULL;    /* number is unreasonable */
                m *= 10;
                c = *--cp;
        } while (c >= '0' && c <= '9');
        len = cp - name + 1;
        bcopy(name, namebuf, len);
        namebuf[len] = '\0';
        /*
         * Now search all the interfaces for this name/number
         */
        for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
                if (strcmp(ifp->if_name, namebuf))
                        continue;
                if (unit == ifp->if_unit)
                        break;
        }
        return (ifp);
}
 
 
/*
 * Map interface name in a sockaddr_dl to
 * interface structure pointer.
 */
struct ifnet *
if_withname(sa)
        struct sockaddr *sa;
{
        char ifname[IFNAMSIZ+1];
        struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
 
        if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
             (sdl->sdl_nlen > IFNAMSIZ) )
                return NULL;
 
        /*
         * ifunit wants a null-terminated name.  It may not be null-terminated
         * in the sockaddr.  We don't want to change the caller's sockaddr,
         * and there might not be room to put the trailing null anyway, so we
         * make a local copy that we know we can null terminate safely.
         */
 
        bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
        ifname[sdl->sdl_nlen] = '\0';
        return ifunit(ifname);
}
 
 
// TEMP?
#define _NAME(s) \
  case s: return #s; break; 
char *
_ioctl_name(u_long cmd)
{
    static char unknown[32];
 
    switch (cmd) {
        _NAME(SIOCSHIWAT);
        _NAME(SIOCGHIWAT);
        _NAME(SIOCSLOWAT);
        _NAME(SIOCGLOWAT);
        _NAME(SIOCATMARK);
        _NAME(SIOCSPGRP);
        _NAME(SIOCGPGRP);
        _NAME(SIOCADDRT);
        _NAME(SIOCDELRT);
//_NAME(SIOCGETVIFCNT);
//_NAME(SIOCGETSGCNT);
        _NAME(SIOCSIFADDR);
        _NAME(OSIOCGIFADDR);
        _NAME(SIOCGIFADDR);
        _NAME(SIOCSIFDSTADDR);
        _NAME(OSIOCGIFDSTADDR);
        _NAME(SIOCGIFDSTADDR);
        _NAME(SIOCSIFFLAGS);
        _NAME(SIOCGIFFLAGS);
        _NAME(OSIOCGIFBRDADDR);
        _NAME(SIOCGIFBRDADDR);
        _NAME(SIOCSIFBRDADDR);
        _NAME(OSIOCGIFCONF);
        _NAME(SIOCGIFCONF);
        _NAME(OSIOCGIFNETMASK);
        _NAME(SIOCGIFNETMASK);
        _NAME(SIOCSIFNETMASK);
        _NAME(SIOCGIFMETRIC);
        _NAME(SIOCSIFMETRIC);
        _NAME(SIOCDIFADDR);
        _NAME(SIOCAIFADDR);
        _NAME(SIOCALIFADDR);
        _NAME(SIOCGLIFADDR);
        _NAME(SIOCDLIFADDR);
        _NAME(SIOCADDMULTI);
        _NAME(SIOCDELMULTI);
        _NAME(SIOCGIFMTU);
        _NAME(SIOCSIFMTU);
        _NAME(SIOCGIFPHYS);
        _NAME(SIOCSIFPHYS);
        _NAME(SIOCSIFMEDIA);
        _NAME(SIOCGIFMEDIA);
        _NAME(SIOCSIFPHYADDR  );
        _NAME(SIOCGIFPSRCADDR);
        _NAME(SIOCGIFPDSTADDR);
        _NAME(SIOCDIFPHYADDR);
        _NAME(SIOCSLIFPHYADDR);
        _NAME(SIOCGLIFPHYADDR);
        _NAME(SIOCSIFGENERIC);
        _NAME(SIOCGIFGENERIC);
        _NAME(SIOCGIFSTATUS);
        _NAME(SIOCSIFLLADDR);
        _NAME(SIOCIFCREATE);
        _NAME(SIOCIFDESTROY);
        _NAME(SIOCIFGCLONERS);
        _NAME(FIONBIO);
        _NAME(FIOASYNC);
        _NAME(FIONREAD);
        _NAME(SIOCGIFHWADDR);
        _NAME(SIOCSIFHWADDR);
        _NAME(SIOCGIFSTATSUD);
        _NAME(SIOCGIFSTATS);
    default:
        diag_sprintf(unknown, "0x%08lx", cmd);
        return unknown;
    }
}
// TEMP?
 
/*
 * Interface ioctls.
 */
int
ifioctl(so, cmd, data, p)
        struct socket *so;
        u_long cmd;
        caddr_t data;
        struct proc *p;
{
        register struct ifnet *ifp;
        register struct ifreq *ifr;
        struct ifstat *ifs;
        int error;
        short oif_flags;
 
        log(LOG_IOCTL, "%s: cmd: %s, data:\n", __FUNCTION__, _ioctl_name(cmd));
        switch (cmd) {
 
        case SIOCGIFCONF:
        case OSIOCGIFCONF:
                return (ifconf(cmd, data));
        }
        ifr = (struct ifreq *)data;
 
        switch (cmd) {
        case SIOCIFCREATE:
        case SIOCIFDESTROY:
                return ((cmd == SIOCIFCREATE) ?
                        if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
                        if_clone_destroy(ifr->ifr_name));
 
        case SIOCIFGCLONERS:
                return (if_clone_list((struct if_clonereq *)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:
                ifr->ifr_prevflags = ifp->if_flags;
                if (ifp->if_flags & IFF_SMART) {
                        /* Smart drivers twiddle their own routes */
                } else if (ifp->if_flags & IFF_UP &&
                    (ifr->ifr_flags & IFF_UP) == 0) {
                        int s = splimp();
                        if_down(ifp);
                        splx(s);
                } else 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);
                getmicrotime(&ifp->if_lastchange);
                break;
 
        case SIOCSIFMETRIC:
                ifp->if_metric = ifr->ifr_metric;
                getmicrotime(&ifp->if_lastchange);
                break;
 
        case SIOCSIFPHYS:
                if (!ifp->if_ioctl)
                        return EOPNOTSUPP;
                error = (*ifp->if_ioctl)(ifp, cmd, data);
                if (error == 0)
                        getmicrotime(&ifp->if_lastchange);
                return(error);
 
        case SIOCSIFMTU:
        {
                u_long oldmtu = ifp->if_mtu;
 
                if (ifp->if_ioctl == NULL)
                        return (EOPNOTSUPP);
                if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
                        return (EINVAL);
                error = (*ifp->if_ioctl)(ifp, cmd, data);
                if (error == 0) {
                        getmicrotime(&ifp->if_lastchange);
                        rt_ifmsg(ifp);
                }
                /*
                 * If the link MTU changed, do network layer specific procedure.
                 */
                if (ifp->if_mtu != oldmtu) {
#ifdef INET6
                        nd6_setmtu(ifp);
#endif
                }
                return (error);
        }
 
        case SIOCADDMULTI:
        case SIOCDELMULTI:
 
                /* Don't allow group membership on non-multicast interfaces. */
                if ((ifp->if_flags & IFF_MULTICAST) == 0)
                        return EOPNOTSUPP;
 
                /* Don't let users screw up protocols' entries. */
                if (ifr->ifr_addr.sa_family != AF_LINK)
                        return EINVAL;
 
                log(LOG_IOCTL, "%s: %s Multi\n", __FUNCTION__,
                    (cmd == SIOCADDMULTI) ? "Add" : "Del");
                log_dump(LOG_IOCTL, &ifr->ifr_addr, 32);
                if (cmd == SIOCADDMULTI) {
                        struct ifmultiaddr *ifma;
                        error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
                } else {
                        error = if_delmulti(ifp, &ifr->ifr_addr);
                }
                if (error == 0)
                        getmicrotime(&ifp->if_lastchange);
                return error;
 
        case SIOCSIFPHYADDR:
        case SIOCDIFPHYADDR:
#ifdef INET6
        case SIOCSIFPHYADDR_IN6:
#endif
        case SIOCSLIFPHYADDR:
        case SIOCSIFMEDIA:
        case SIOCSIFGENERIC:
                if (ifp->if_ioctl == 0)
                        return (EOPNOTSUPP);
                error = (*ifp->if_ioctl)(ifp, cmd, data);
                if (error == 0)
                        getmicrotime(&ifp->if_lastchange);
                return error;
 
        case SIOCGIFSTATUS:
                ifs = (struct ifstat *)data;
                ifs->ascii[0] = '\0';
 
        case SIOCGIFPSRCADDR:
        case SIOCGIFPDSTADDR:
        case SIOCGLIFPHYADDR:
        case SIOCGIFMEDIA:
        case SIOCGIFGENERIC:
        case SIOCGIFSTATS:
        case SIOCGIFSTATSUD:
                if (ifp->if_ioctl == 0)
                        return (EOPNOTSUPP);
                return ((*ifp->if_ioctl)(ifp, cmd, data));
 
        case SIOCSIFLLADDR:
                return if_setlladdr(ifp,
                    (u_char *)ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);
 
        default:
                oif_flags = ifp->if_flags;
                if (so->so_proto == 0)
                        return (EOPNOTSUPP);
#ifndef COMPAT_43
                error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
                                                                 data,
                                                                 ifp, p));
#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:
                        cmd = SIOCGIFNETMASK;
                }
                error =  ((*so->so_proto->pr_usrreqs->pru_control)(so,
                                                                   cmd,
                                                                   data,
                                                                   ifp, p));
                switch (ocmd) {
 
                case OSIOCGIFADDR:
                case OSIOCGIFDSTADDR:
                case OSIOCGIFBRDADDR:
                case OSIOCGIFNETMASK:
                        *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
 
                }
            }
#endif /* COMPAT_43 */
 
                if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
#ifdef INET6
#define DELAY cyg_thread_delay
                        DELAY(100);/* XXX: temporary workaround for fxp issue*/
                        if (ifp->if_flags & IFF_UP) {
                                int s = splimp();
                                in6_if_up(ifp);
                                splx(s);
                        }
#endif
                }
                return (error);
 
        }
        return (0);
}
 
/*
 * Set/clear promiscuous mode on interface ifp based on the truth value
 * of pswitch.  The calls are reference counted so that only the first
 * "on" request actually has an effect, as does the final "off" request.
 * Results are undefined if the "off" and "on" requests are not matched.
 */
int
ifpromisc(ifp, pswitch)
        struct ifnet *ifp;
        int pswitch;
{
        struct ifreq ifr;
        int error;
        int oldflags;
 
        oldflags = ifp->if_flags;
        if (pswitch) {
                /*
                 * If the device is not configured up, we cannot put it in
                 * promiscuous mode.
                 */
                if ((ifp->if_flags & IFF_UP) == 0)
                        return (ENETDOWN);
                if (ifp->if_pcount++ != 0)
                        return (0);
                ifp->if_flags |= IFF_PROMISC;
                log(LOG_INFO, "%s%d: promiscuous mode enabled\n",
                    ifp->if_name, ifp->if_unit);
        } else {
                if (--ifp->if_pcount > 0)
                        return (0);
                ifp->if_flags &= ~IFF_PROMISC;
                log(LOG_INFO, "%s%d: promiscuous mode disabled\n",
                    ifp->if_name, ifp->if_unit);
        }
        ifr.ifr_flags = ifp->if_flags;
        error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
        if (error == 0)
                rt_ifmsg(ifp);
        else
                ifp->if_flags = oldflags;
        return error;
}
 
/*
 * Return interface configuration
 * of system.  List may be used
 * in later ioctl's (above) to get
 * other information.
 */
/*ARGSUSED*/
static int
ifconf(cmd, data)
        u_long cmd;
        caddr_t data;
{
        register struct ifconf *ifc = (struct ifconf *)data;
        register struct ifnet *ifp = ifnet.tqh_first;
        register struct ifaddr *ifa;
        struct ifreq ifr, *ifrp;
        int space = ifc->ifc_len, error = 0;
 
        ifrp = ifc->ifc_req;
        for (; space > sizeof (ifr) && ifp; ifp = ifp->if_link.tqe_next) {
                char workbuf[64];
                int ifnlen, addrs;
 
                ifnlen = snprintf(workbuf, sizeof(workbuf),
                    "%s%d", ifp->if_name, ifp->if_unit);
                if(ifnlen + 1 > sizeof ifr.ifr_name) {
                        error = ENAMETOOLONG;
                        break;
                } else {
                        strcpy(ifr.ifr_name, workbuf);
                }
 
                addrs = 0;
                ifa = ifp->if_addrhead.tqh_first;
                for ( ; space > sizeof (ifr) && ifa;
                    ifa = ifa->ifa_link.tqe_next) {
                        register struct sockaddr *sa = ifa->ifa_addr;
                        addrs++;
#ifdef COMPAT_43
                        if (cmd == OSIOCGIFCONF) {
                                struct osockaddr *osa =
                                         (struct osockaddr *)&ifr.ifr_addr;
                                ifr.ifr_addr = *sa;
                                osa->sa_family = sa->sa_family;
                                error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
                                                sizeof (ifr));
                                ifrp++;
                        } else
#endif
                        if (sa->sa_len <= sizeof(*sa)) {
                                ifr.ifr_addr = *sa;
                                error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
                                                sizeof (ifr));
                                ifrp++;
                        } else {
                                if (space < sizeof (ifr) + sa->sa_len -
                                            sizeof(*sa))
                                        break;
                                space -= sa->sa_len - sizeof(*sa);
                                error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
                                                sizeof (ifr.ifr_name));
                                if (error == 0)
                                    error = copyout((caddr_t)sa,
                                      (caddr_t)&ifrp->ifr_addr, sa->sa_len);
                                ifrp = (struct ifreq *)
                                        (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
                        }
                        if (error)
                                break;
                        space -= sizeof (ifr);
                }
                if (error)
                        break;
                if (!addrs) {
                        bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
                        error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
                            sizeof (ifr));
                        if (error)
                                break;
                        space -= sizeof (ifr);
                        ifrp++;
                }
        }
        ifc->ifc_len -= space;
        return (error);
}
 
/*
 * Just like if_promisc(), but for all-multicast-reception mode.
 */
int
if_allmulti(ifp, onswitch)
        struct ifnet *ifp;
        int onswitch;
{
        int error = 0;
        int s = splimp();
 
        if (onswitch) {
                if (ifp->if_amcount++ == 0) {
                        ifp->if_flags |= IFF_ALLMULTI;
                        error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0);
                }
        } else {
                if (ifp->if_amcount > 1) {
                        ifp->if_amcount--;
                } else {
                        ifp->if_amcount = 0;
                        ifp->if_flags &= ~IFF_ALLMULTI;
                        error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0);
                }
        }
        splx(s);
 
        if (error == 0)
                rt_ifmsg(ifp);
        return error;
}
 
/*
 * Add a multicast listenership to the interface in question.
 * The link layer provides a routine which converts
 */
int
if_addmulti(ifp, sa, retifma)
        struct ifnet *ifp;      /* interface to manipulate */
        struct sockaddr *sa;    /* address to add */
        struct ifmultiaddr **retifma;
{
        struct sockaddr *llsa, *dupsa;
        int error, s;
        struct ifmultiaddr *ifma;
 
        /*
         * If the matching multicast address already exists
         * then don't add a new one, just add a reference
         */
        for (ifma = ifp->if_multiaddrs.lh_first; ifma;
             ifma = ifma->ifma_link.le_next) {
                if (equal(sa, ifma->ifma_addr)) {
                        ifma->ifma_refcount++;
                        if (retifma)
                                *retifma = ifma;
                        return 0;
                }
        }
 
        /*
         * Give the link layer a chance to accept/reject it, and also
         * find out which AF_LINK address this maps to, if it isn't one
         * already.
         */
        if (ifp->if_resolvemulti) {
                error = ifp->if_resolvemulti(ifp, &llsa, sa);
                if (error) return error;
        } else {
                llsa = 0;
        }
 
        MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
        MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
        bcopy(sa, dupsa, sa->sa_len);
 
        ifma->ifma_addr = dupsa;
        ifma->ifma_lladdr = llsa;
        ifma->ifma_ifp = ifp;
        ifma->ifma_refcount = 1;
        ifma->ifma_protospec = 0;
        rt_newmaddrmsg(RTM_NEWMADDR, ifma);
 
        /*
         * Some network interfaces can scan the address list at
         * interrupt time; lock them out.
         */
        s = splimp();
        LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
        splx(s);
        *retifma = ifma;
 
        if (llsa != 0) {
                for (ifma = ifp->if_multiaddrs.lh_first; ifma;
                     ifma = ifma->ifma_link.le_next) {
                        if (equal(ifma->ifma_addr, llsa))
                                break;
                }
                if (ifma) {
                        ifma->ifma_refcount++;
                } else {
                        MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
                               M_IFMADDR, M_WAITOK);
                        MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
                               M_IFMADDR, M_WAITOK);
                        bcopy(llsa, dupsa, llsa->sa_len);
                        ifma->ifma_addr = dupsa;
                        ifma->ifma_ifp = ifp;
                        ifma->ifma_refcount = 1;
                        s = splimp();
                        LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
                        splx(s);
                }
        }
        /*
         * We are certain we have added something, so call down to the
         * interface to let them know about it.
         */
        s = splimp();
        ifp->if_ioctl(ifp, SIOCADDMULTI, 0);
        splx(s);
 
        return 0;
}
 
/*
 * Remove a reference to a multicast address on this interface.  Yell
 * if the request does not match an existing membership.
 */
int
if_delmulti(ifp, sa)
        struct ifnet *ifp;
        struct sockaddr *sa;
{
        struct ifmultiaddr *ifma;
        int s;
 
        for (ifma = ifp->if_multiaddrs.lh_first; ifma;
             ifma = ifma->ifma_link.le_next)
                if (equal(sa, ifma->ifma_addr))
                        break;
        if (ifma == 0)
                return ENOENT;
 
        if (ifma->ifma_refcount > 1) {
                ifma->ifma_refcount--;
                return 0;
        }
 
        rt_newmaddrmsg(RTM_DELMADDR, ifma);
        sa = ifma->ifma_lladdr;
        s = splimp();
        LIST_REMOVE(ifma, ifma_link);
        /*
         * Make sure the interface driver is notified
         * in the case of a link layer mcast group being left.
         */
        if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
                ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
        splx(s);
        free(ifma->ifma_addr, M_IFMADDR);
        free(ifma, M_IFMADDR);
        if (sa == 0)
                return 0;
 
        /*
         * Now look for the link-layer address which corresponds to
         * this network address.  It had been squirreled away in
         * ifma->ifma_lladdr for this purpose (so we don't have
         * to call ifp->if_resolvemulti() again), and we saved that
         * value in sa above.  If some nasty deleted the
         * link-layer address out from underneath us, we can deal because
         * the address we stored was is not the same as the one which was
         * in the record for the link-layer address.  (So we don't complain
         * in that case.)
         */
        for (ifma = ifp->if_multiaddrs.lh_first; ifma;
             ifma = ifma->ifma_link.le_next)
                if (equal(sa, ifma->ifma_addr))
                        break;
        if (ifma == 0)
                return 0;
 
        if (ifma->ifma_refcount > 1) {
                ifma->ifma_refcount--;
                return 0;
        }
 
        s = splimp();
        LIST_REMOVE(ifma, ifma_link);
        ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
        splx(s);
        free(ifma->ifma_addr, M_IFMADDR);
        free(sa, M_IFMADDR);
        free(ifma, M_IFMADDR);
 
        return 0;
}
 
/*
 * Set the link layer address on an interface.
 *
 * At this time we only support certain types of interfaces,
 * and we don't allow the length of the address to change.
 */
int
if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
{
        struct sockaddr_dl *sdl;
        struct ifaddr *ifa;
 
        ifa = ifnet_addrs[ifp->if_index - 1];
        if (ifa == NULL)
                return (EINVAL);
        sdl = (struct sockaddr_dl *)ifa->ifa_addr;
        if (sdl == NULL)
                return (EINVAL);
        if (len != sdl->sdl_alen)       /* don't allow length to change */
                return (EINVAL);
        switch (ifp->if_type) {
        case IFT_ETHER:                 /* these types use struct arpcom */
        case IFT_FDDI:
        case IFT_XETHER:
        case IFT_ISO88025:
        case IFT_L2VLAN:
                bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
                bcopy(lladdr, LLADDR(sdl), len);
                break;
        default:
                return (ENODEV);
        }
        /*
         * If the interface is already up, we need
         * to re-init it in order to reprogram its
         * address filter.
         */
        if ((ifp->if_flags & IFF_UP) != 0) {
                ifp->if_flags &= ~IFF_UP;
                (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
                ifp->if_flags |= IFF_UP;
                (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
        }
        return (0);
}
 
struct ifmultiaddr *
ifmaof_ifpforaddr(sa, ifp)
        struct sockaddr *sa;
        struct ifnet *ifp;
{
        struct ifmultiaddr *ifma;
 
        for (ifma = ifp->if_multiaddrs.lh_first; ifma;
             ifma = ifma->ifma_link.le_next)
                if (equal(ifma->ifma_addr, sa))
                        break;
 
        return ifma;
}
 
SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
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Line No.	Rev	Author	Line
1	786	skrzyp	`//==========================================================================`
2			`//`
3			`// src/sys/net/if.c`
4			`//`
5			`//==========================================================================`
6			`// ####BSDCOPYRIGHTBEGIN####`
7			`// -------------------------------------------`
8			`// This file is part of eCos, the Embedded Configurable Operating System.`
9			`//`
10			`// Portions of this software may have been derived from FreeBSD`
11			`// or other sources, and if so are covered by the appropriate copyright`
12			`// and license included herein.`
13			`//`
14			`// Portions created by the Free Software Foundation are`
15			`// Copyright (C) 2002 Free Software Foundation, Inc.`
16			`// -------------------------------------------`
17			`// ####BSDCOPYRIGHTEND####`
18			`//==========================================================================`
19
20			`/*`
21			`* Copyright (c) 1980, 1986, 1993`
22			`* The Regents of the University of California. All rights reserved.`
23			`*`
24			`* Redistribution and use in source and binary forms, with or without`
25			`* modification, are permitted provided that the following conditions`
26			`* are met:`
27			`* 1. Redistributions of source code must retain the above copyright`
28			`* notice, this list of conditions and the following disclaimer.`
29			`* 2. Redistributions in binary form must reproduce the above copyright`
30			`* notice, this list of conditions and the following disclaimer in the`
31			`* documentation and/or other materials provided with the distribution.`
32			`* 3. All advertising materials mentioning features or use of this software`
33			`* must display the following acknowledgement:`
34			`* This product includes software developed by the University of`
35			`* California, Berkeley and its contributors.`
36			`* 4. Neither the name of the University nor the names of its contributors`
37			`* may be used to endorse or promote products derived from this software`
38			`* without specific prior written permission.`
39			`*`
40			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND