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//==========================================================================

//

//      src/sys/net/if_ethersubr.c

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD, 

// FreeBSD or other sources, and are covered by the appropriate

// copyright disclaimers included herein.

//

// Portions created by Red Hat are

// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

/*

 * Copyright (c) 1982, 1989, 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_ethersubr.c      8.1 (Berkeley) 6/10/93

 * $FreeBSD: src/sys/net/if_ethersubr.c,v 1.70.2.17 2001/08/01 00:47:49 fenner Exp $

 */

#include <sys/param.h>

#include <sys/malloc.h>

#include <sys/mbuf.h>

#include <sys/socket.h>

#include <sys/sockio.h>

#include <net/if.h>

#include <net/netisr.h>

#include <net/route.h>

#include <net/if_dl.h>

#include <net/if_types.h>

#include <net/ethernet.h>

#if defined(INET) || defined(INET6)

#include <netinet/in.h>

#include <netinet/in_var.h>

#include <netinet/if_ether.h>

#endif

#ifdef INET6

#include <netinet6/nd6.h>

#endif

#ifdef IPX

#include <netipx/ipx.h>

#include <netipx/ipx_if.h>

int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);

int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,

                struct sockaddr *dst, short *tp, int *hlen);

#endif

#ifdef NS

#include <netns/ns.h>

#include <netns/ns_if.h>

ushort ns_nettype;

int ether_outputdebug = 0;

int ether_inputdebug = 0;

#endif

#ifdef NETATALK

#include <netatalk/at.h>

#include <netatalk/at_var.h>

#include <netatalk/at_extern.h>

#define llc_snap_org_code llc_un.type_snap.org_code

#define llc_snap_ether_type llc_un.type_snap.ether_type

extern u_char   at_org_code[3];

extern u_char   aarp_org_code[3];

#endif /* NETATALK */

#ifdef BRIDGE

#include <net/bridge.h>

#endif

#define NVLAN 0

#if NVLAN > 0

#include <net/if_vlan_var.h>

#endif /* NVLAN > 0 */

/* netgraph node hooks for ng_ether(4) */

void    (*ng_ether_input_p)(struct ifnet *ifp,

                struct mbuf **mp, struct ether_header *eh);

void    (*ng_ether_input_orphan_p)(struct ifnet *ifp,

                struct mbuf *m, struct ether_header *eh);

int     (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);

void    (*ng_ether_attach_p)(struct ifnet *ifp);

void    (*ng_ether_detach_p)(struct ifnet *ifp);

static  int ether_resolvemulti __P((struct ifnet *, struct sockaddr **,

                                    struct sockaddr *));

u_char  etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

#define senderr(e) do { error = (e); goto bad;} while (0)

#define IFP2AC(IFP) ((struct arpcom *)IFP)

/*

 * Ethernet output routine.

 * Encapsulate a packet of type family for the local net.

 * Use trailer local net encapsulation if enough data in first

 * packet leaves a multiple of 512 bytes of data in remainder.

 * Assumes that ifp is actually pointer to arpcom structure.

 */

int

ether_output(ifp, m, dst, rt0)

        register struct ifnet *ifp;

        struct mbuf *m;

        struct sockaddr *dst;

        struct rtentry *rt0;

{

        short type;

        int error = 0, hdrcmplt = 0;

        u_char esrc[6], edst[6];

        register struct rtentry *rt;

        register struct ether_header *eh;

        int off, loop_copy = 0;

        int hlen;       /* link layer header lenght */

        struct arpcom *ac = IFP2AC(ifp);

        if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))

                senderr(ENETDOWN);

        rt = rt0;

        if (rt) {

                if ((rt->rt_flags & RTF_UP) == 0) {

                        rt0 = rt = rtalloc1(dst, 1, 0UL);

                        if (rt0)

                                rt->rt_refcnt--;

                        else

                                senderr(EHOSTUNREACH);

                }

                if (rt->rt_flags & RTF_GATEWAY) {

                        if (rt->rt_gwroute == 0)

                                goto lookup;

                        if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {

                                rtfree(rt); rt = rt0;

                        lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,

                                                          0UL);

                                if ((rt = rt->rt_gwroute) == 0)

                                        senderr(EHOSTUNREACH);

                        }

                }

                if (rt->rt_flags & RTF_REJECT)

                        if (rt->rt_rmx.rmx_expire == 0 ||

                            time_second < rt->rt_rmx.rmx_expire)

                                senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);

        }

        hlen = ETHER_HDR_LEN;

        switch (dst->sa_family) {

#ifdef INET

        case AF_INET:

                if (!arpresolve(ac, rt, m, dst, edst, rt0))

                        return (0);      /* if not yet resolved */

                off = m->m_pkthdr.len - m->m_len;

                type = htons(ETHERTYPE_IP);

                break;

#endif

#ifdef INET6

        case AF_INET6:

                if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {

                        /* Something bad happened */

                        return(0);

                }

                off = m->m_pkthdr.len - m->m_len;

                type = htons(ETHERTYPE_IPV6);

                break;

#endif

#ifdef IPX

        case AF_IPX:

                if (ef_outputp) {

                    error = ef_outputp(ifp, &m, dst, &type, &hlen);

                    if (error)

                        goto bad;

                } else

                    type = htons(ETHERTYPE_IPX);

                bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host),

                    (caddr_t)edst, sizeof (edst));

                break;

#endif

#ifdef NETATALK

        case AF_APPLETALK:

          {

            struct at_ifaddr *aa;

            if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) {

                    goto bad;

            }

            if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst))

                    return (0);

            /*

             * In the phase 2 case, need to prepend an mbuf for the llc header.

             * Since we must preserve the value of m, which is passed to us by

             * value, we m_copy() the first mbuf, and use it for our llc header.

             */

            if ( aa->aa_flags & AFA_PHASE2 ) {

                struct llc llc;

                M_PREPEND(m, sizeof(struct llc), M_WAIT);

                llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;

                llc.llc_control = LLC_UI;

                bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code));

                llc.llc_snap_ether_type = htons( ETHERTYPE_AT );

                bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc));

                type = htons(m->m_pkthdr.len);

                hlen = sizeof(struct llc) + ETHER_HDR_LEN;

            } else {

                type = htons(ETHERTYPE_AT);

            }

            break;

          }

#endif /* NETATALK */

#ifdef NS

        case AF_NS:

                switch(ns_nettype){

                default:

                case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */

                        type = 0x8137;

                        break;

                case 0x0: /* Novell 802.3 */

                        type = htons( m->m_pkthdr.len);

                        break;

                case 0xe0e0: /* Novell 802.2 and Token-Ring */

                        M_PREPEND(m, 3, M_WAIT);

                        type = htons( m->m_pkthdr.len);

                        cp = mtod(m, u_char *);

                        *cp++ = 0xE0;

                        *cp++ = 0xE0;

                        *cp++ = 0x03;

                        break;

                }

                bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),

                    (caddr_t)edst, sizeof (edst));

                /*

                 * XXX if ns_thishost is the same as the node's ethernet

                 * address then just the default code will catch this anyhow.

                 * So I'm not sure if this next clause should be here at all?

                 * [JRE]

                 */

                if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){

                        m->m_pkthdr.rcvif = ifp;

                        schednetisr(NETISR_NS);

                        inq = &nsintrq;

                        s = splimp();

                        if (IF_QFULL(inq)) {

                                IF_DROP(inq);

                                m_freem(m);

                        } else

                                IF_ENQUEUE(inq, m);

                        splx(s);

                        return (error);

                }

                if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){

                        m->m_flags |= M_BCAST;

                }

                break;

#endif /* NS */

        case pseudo_AF_HDRCMPLT:

                hdrcmplt = 1;

                eh = (struct ether_header *)dst->sa_data;

                (void)memcpy(esrc, eh->ether_shost, sizeof (esrc));

                /* FALLTHROUGH */

        case AF_UNSPEC:

                loop_copy = -1; /* if this is for us, don't do it */

                eh = (struct ether_header *)dst->sa_data;

                (void)memcpy(edst, eh->ether_dhost, sizeof (edst));

                type = eh->ether_type;

                break;

        default:

                printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,

                        dst->sa_family);

                senderr(EAFNOSUPPORT);

        }

        /*

         * Add local net header.  If no space in first mbuf,

         * allocate another.

         */

        M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);

        if (m == 0)

                senderr(ENOBUFS);

        eh = mtod(m, struct ether_header *);

        (void)memcpy(&eh->ether_type, &type,

                sizeof(eh->ether_type));

        (void)memcpy(eh->ether_dhost, edst, sizeof (edst));

        if (hdrcmplt)

                (void)memcpy(eh->ether_shost, esrc,

                        sizeof(eh->ether_shost));

        else

                (void)memcpy(eh->ether_shost, ac->ac_enaddr,

                        sizeof(eh->ether_shost));

        /*

         * If a simplex interface, and the packet is being sent to our

         * Ethernet address or a broadcast address, loopback a copy.

         * XXX To make a simplex device behave exactly like a duplex

         * device, we should copy in the case of sending to our own

         * ethernet address (thus letting the original actually appear

         * on the wire). However, we don't do that here for security

         * reasons and compatibility with the original behavior.

         */

        if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {

                if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {

                        struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);

                        (void) if_simloop(ifp, n, dst->sa_family, hlen);

                } else if (bcmp(eh->ether_dhost,

                    eh->ether_shost, ETHER_ADDR_LEN) == 0) {

                        (void) if_simloop(ifp, m, dst->sa_family, hlen);

                        return (0);      /* XXX */

                }

        }

        /* Handle ng_ether(4) processing, if any */

        if (ng_ether_output_p != NULL) {

                if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {

bad:                    if (m != NULL)

                                m_freem(m);

                        return (error);

                }

                if (m == NULL)

                        return (0);

        }

        /* Continue with link-layer output */

        return ether_output_frame(ifp, m);

}

/*

 * Ethernet link layer output routine to send a raw frame to the device.

 *

 * This assumes that the 14 byte Ethernet header is present and contiguous

 * in the first mbuf (if BRIDGE'ing).

 */

int

ether_output_frame(ifp, m)

        struct ifnet *ifp;

        struct mbuf *m;

{

        int s, len, error = 0;

        short mflags;

#ifdef ALTQ

        struct altq_pktattr pktattr;

#endif

#ifdef BRIDGE

        if (do_bridge && BDG_USED(ifp) ) {

                struct ether_header *eh; /* a ptr suffices */

                m->m_pkthdr.rcvif = NULL;

                eh = mtod(m, struct ether_header *);

                m_adj(m, ETHER_HDR_LEN);

                m = bdg_forward(m, eh, ifp);

                if (m != NULL)

                        m_freem(m);

                return (0);

        }

#endif

#ifdef ALTQ

        if (ALTQ_IS_ENABLED(&ifp->if_snd))

                altq_etherclassify(&ifp->if_snd, m, &pktattr);

#endif

        mflags = m->m_flags;

        len = m->m_pkthdr.len;

        s = splimp();

        /*

         * Queue message on interface, and start output if interface

         * not yet active.

         */

#ifdef ALTQ

        IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error);

#else

        IFQ_ENQUEUE(&ifp->if_snd, m, error);

#endif

        if (error) {

                /* mbuf is already freed */

                splx(s);

                return (error);

        }

        ifp->if_obytes += len;

        if (mflags & M_MCAST)

                ifp->if_omcasts++;

        if ((ifp->if_flags & IFF_OACTIVE) == 0)

                (*ifp->if_start)(ifp);

        splx(s);

        return (error);

}

/*

 * Process a received Ethernet packet;

 * the packet is in the mbuf chain m without

 * the ether header, which is provided separately.

 *

 * First we perform any link layer operations, then continue

 * to the upper layers with ether_demux().

 */

void

ether_input(ifp, eh, m)

        struct ifnet *ifp;

        struct ether_header *eh;

        struct mbuf *m;

{

#ifdef BRIDGE

        struct ether_header save_eh;

#endif

#ifdef BPF

        /* Check for a BPF tap */

        if (ifp->if_bpf != NULL) {

                struct m_hdr mh;

                /* This kludge is OK; BPF treats the "mbuf" as read-only */

                mh.mh_next = m;

                mh.mh_data = (char *)eh;

                mh.mh_len = ETHER_HDR_LEN;

                bpf_mtap(ifp, (struct mbuf *)&mh);

        }

#endif

        /* Handle ng_ether(4) processing, if any */

        if (ng_ether_input_p != NULL) {

                (*ng_ether_input_p)(ifp, &m, eh);

                if (m == NULL)

                        return;

        }

#ifdef BRIDGE

        /* Check for bridging mode */

        if (do_bridge && BDG_USED(ifp) ) {

                struct ifnet *bif;

                /* Check with bridging code */

                if ((bif = bridge_in(ifp, eh)) == BDG_DROP) {

                        m_freem(m);

                        return;

                }

                if (bif != BDG_LOCAL) {

                        struct mbuf *oldm = m ;

                        save_eh = *eh ; /* because it might change */

                        m = bdg_forward(m, eh, bif);    /* needs forwarding */

                        /*

                         * Do not continue if bdg_forward() processed our

                         * packet (and cleared the mbuf pointer m) or if

                         * it dropped (m_free'd) the packet itself.

                         */

                        if (m == NULL) {

                            if (bif == BDG_BCAST || bif == BDG_MCAST)

                                printf("bdg_forward drop MULTICAST PKT\n");

                            return;

                        }

                        if (m != oldm) /* m changed! */

                            eh = &save_eh ;

                }

                if (bif == BDG_LOCAL

                    || bif == BDG_BCAST

                    || bif == BDG_MCAST)

                        goto recvLocal;                 /* receive locally */

                /* If not local and not multicast, just drop it */

                if (m != NULL)

                        m_freem(m);

                return;

       }

#endif

#ifdef BRIDGE

recvLocal:

#endif

        /* Continue with upper layer processing */

        ether_demux(ifp, eh, m);

}

/*

 * Upper layer processing for a received Ethernet packet.

 */

void

ether_demux(ifp, eh, m)

        struct ifnet *ifp;

        struct ether_header *eh;

        struct mbuf *m;

{

        struct ifqueue *inq;

        u_short ether_type;

        int s;

#if defined(NETATALK)

        register struct llc *l;

#endif

#ifdef BRIDGE

    if (! (do_bridge && BDG_USED(ifp) ) )

#endif

        /* Discard packet if upper layers shouldn't see it because it was

           unicast to a different Ethernet address. If the driver is working

           properly, then this situation can only happen when the interface

           is in promiscuous mode. */

        if ((ifp->if_flags & IFF_PROMISC) != 0

            && (eh->ether_dhost[0] & 1) == 0

            && bcmp(eh->ether_dhost,

              IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN) != 0) {

                m_freem(m);

                return;

        }

        /* Discard packet if interface is not up */

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

                m_freem(m);

                return;

        }

        if (eh->ether_dhost[0] & 1) {

                /*

                 * If this is not a simplex interface, drop the packet

                 * if it came from us.

                 */

                if ((ifp->if_flags & IFF_SIMPLEX) == 0) {

                        struct ifaddr *ifa;

                        struct sockaddr_dl *sdl = NULL;

                        /* find link-layer address */

                        TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)

                                if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&

                                    sdl->sdl_family == AF_LINK)

                                        break;

                        if (sdl && bcmp(LLADDR(sdl), eh->ether_shost,

                            ETHER_ADDR_LEN) == 0) {

                                m_freem(m);

                                return;

                        }

                }

                if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,

                         sizeof(etherbroadcastaddr)) == 0)

                        m->m_flags |= M_BCAST;

                else

                        m->m_flags |= M_MCAST;

        }

        if (m->m_flags & (M_BCAST|M_MCAST))

                ifp->if_imcasts++;

        ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);

        ether_type = ntohs(eh->ether_type);

#if NVLAN > 0

        if (ether_type == vlan_proto) {

                if (vlan_input(eh, m) < 0)

                        ifp->if_data.ifi_noproto++;

                return;

        }

#endif /* NVLAN > 0 */

        switch (ether_type) {

#ifdef INET

        case ETHERTYPE_IP:

                if (ipflow_fastforward(m))

                        return;

                schednetisr(NETISR_IP);

                inq = &ipintrq;

                break;

        case ETHERTYPE_ARP:

                if (ifp->if_flags & IFF_NOARP) {

                        /* Discard packet if ARP is disabled on interface */

                        m_freem(m);

                        return;

                }

                schednetisr(NETISR_ARP);

                inq = &arpintrq;

                break;

#endif

#ifdef IPX

        case ETHERTYPE_IPX:

                if (ef_inputp && ef_inputp(ifp, eh, m) == 0)

                        return;

                schednetisr(NETISR_IPX);

                inq = &ipxintrq;

                break;

#endif

#ifdef INET6

        case ETHERTYPE_IPV6:

                schednetisr(NETISR_IPV6);

                inq = &ip6intrq;

                break;

#endif

#ifdef NS

        case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */

                schednetisr(NETISR_NS);

                inq = &nsintrq;

                break;

#endif /* NS */

#ifdef NETATALK

        case ETHERTYPE_AT:

                schednetisr(NETISR_ATALK);

                inq = &atintrq1;

                break;

        case ETHERTYPE_AARP:

                /* probably this should be done with a NETISR as well */

                aarpinput(IFP2AC(ifp), m); /* XXX */

                return;

#endif /* NETATALK */

        default:

#ifdef IPX

                if (ef_inputp && ef_inputp(ifp, eh, m) == 0)

                        return;

#endif /* IPX */

#ifdef NS

                checksum = mtod(m, ushort *);

                /* Novell 802.3 */

                if ((ether_type <= ETHERMTU) &&

                        ((*checksum == 0xffff) || (*checksum == 0xE0E0))){

                        if(*checksum == 0xE0E0) {

                                m->m_pkthdr.len -= 3;

                                m->m_len -= 3;

                                m->m_data += 3;

                        }

                                schednetisr(NETISR_NS);

                                inq = &nsintrq;

                                break;

                }

#endif /* NS */

#if defined(NETATALK)

                if (ether_type > ETHERMTU)

                        goto dropanyway;

                l = mtod(m, struct llc *);