kernel - Fix callout_stop/callout_reset rearm race

[dragonfly.git] / sys / net / if_ethersubr.c

/*
 * 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. 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 1.70.2.33 2003/04/28 15:45:53 archie Exp $
 */

#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_mpls.h"
#include "opt_netgraph.h"
#include "opt_carp.h"
#include "opt_rss.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/globaldata.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/msgport.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/thread.h>

#include <sys/thread2.h>
#include <sys/mplock2.h>

#include <net/if.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/if_llc.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/ifq_var.h>
#include <net/bpf.h>
#include <net/ethernet.h>
#include <net/vlan/if_vlan_ether.h>
#include <net/vlan/if_vlan_var.h>
#include <net/netmsg2.h>
#include <net/netisr2.h>

#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <netinet/ip_var.h>
#include <netinet/tcp_var.h>
#include <netinet/if_ether.h>
#include <netinet/ip_flow.h>
#include <net/ipfw/ip_fw.h>
#include <net/ipfw3/ip_fw.h>
#include <net/dummynet/ip_dummynet.h>
#endif
#ifdef INET6
#include <netinet6/nd6.h>
#endif

#ifdef CARP
#include <netinet/ip_carp.h>
#endif

#ifdef MPLS
#include <netproto/mpls/mpls.h>
#endif

/* netgraph node hooks for ng_ether(4) */
void    (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
void    (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
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);

void    (*vlan_input_p)(struct mbuf *);

static int ether_output(struct ifnet *, struct mbuf *, struct sockaddr *,
                        struct rtentry *);
static void ether_restore_header(struct mbuf **, const struct ether_header *,
                                 const struct ether_header *);
static int ether_characterize(struct mbuf **);
static void ether_dispatch(int, struct mbuf *, int);

/*
 * if_bridge support
 */
struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
int (*bridge_output_p)(struct ifnet *, struct mbuf *);
void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
struct ifnet *(*bridge_interface_p)(void *if_bridge);

static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
                              struct sockaddr *);

/*
 * if_lagg(4) support
 */
void    (*lagg_input_p)(struct ifnet *, struct mbuf *); 
int (*lagg_output_p)(struct ifnet *, struct mbuf *);

const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN] = {
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};

#define gotoerr(e) do { error = (e); goto bad; } while (0)
#define IFP2AC(ifp) ((struct arpcom *)(ifp))

static boolean_t ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst,
                                struct ip_fw **rule,
                                const struct ether_header *eh);

static int ether_ipfw;
static u_long ether_restore_hdr;
static u_long ether_prepend_hdr;
static u_long ether_input_wronghash;
static int ether_debug;

#ifdef RSS_DEBUG
static u_long ether_pktinfo_try;
static u_long ether_pktinfo_hit;
static u_long ether_rss_nopi;
static u_long ether_rss_nohash;
static u_long ether_input_requeue;
#endif
static u_long ether_input_wronghwhash;
static int ether_input_ckhash;

#define ETHER_TSOLEN_DEFAULT    (4 * ETHERMTU)

#define ETHER_NMBCLUSTERS_DEFMIN        32
#define ETHER_NMBCLUSTERS_DEFAULT       256

static int ether_tsolen_default = ETHER_TSOLEN_DEFAULT;
TUNABLE_INT("net.link.ether.tsolen", &ether_tsolen_default);

static int ether_nmbclusters_default = ETHER_NMBCLUSTERS_DEFAULT;
TUNABLE_INT("net.link.ether.nmbclusters", &ether_nmbclusters_default);

SYSCTL_DECL(_net_link);
SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
SYSCTL_INT(_net_link_ether, OID_AUTO, debug, CTLFLAG_RW,
    &ether_debug, 0, "Ether debug");
SYSCTL_INT(_net_link_ether, OID_AUTO, ipfw, CTLFLAG_RW,
    &ether_ipfw, 0, "Pass ether pkts through firewall");
SYSCTL_ULONG(_net_link_ether, OID_AUTO, restore_hdr, CTLFLAG_RW,
    &ether_restore_hdr, 0, "# of ether header restoration");
SYSCTL_ULONG(_net_link_ether, OID_AUTO, prepend_hdr, CTLFLAG_RW,
    &ether_prepend_hdr, 0,
    "# of ether header restoration which prepends mbuf");
SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_wronghash, CTLFLAG_RW,
    &ether_input_wronghash, 0, "# of input packets with wrong hash");
SYSCTL_INT(_net_link_ether, OID_AUTO, tsolen, CTLFLAG_RW,
    &ether_tsolen_default, 0, "Default max TSO length");

#ifdef RSS_DEBUG
SYSCTL_ULONG(_net_link_ether, OID_AUTO, rss_nopi, CTLFLAG_RW,
    &ether_rss_nopi, 0, "# of packets do not have pktinfo");
SYSCTL_ULONG(_net_link_ether, OID_AUTO, rss_nohash, CTLFLAG_RW,
    &ether_rss_nohash, 0, "# of packets do not have hash");
SYSCTL_ULONG(_net_link_ether, OID_AUTO, pktinfo_try, CTLFLAG_RW,
    &ether_pktinfo_try, 0,
    "# of tries to find packets' msgport using pktinfo");
SYSCTL_ULONG(_net_link_ether, OID_AUTO, pktinfo_hit, CTLFLAG_RW,
    &ether_pktinfo_hit, 0,
    "# of packets whose msgport are found using pktinfo");
SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_requeue, CTLFLAG_RW,
    &ether_input_requeue, 0, "# of input packets gets requeued");
#endif
SYSCTL_ULONG(_net_link_ether, OID_AUTO, input_wronghwhash, CTLFLAG_RW,
    &ether_input_wronghwhash, 0, "# of input packets with wrong hw hash");
SYSCTL_INT(_net_link_ether, OID_AUTO, always_ckhash, CTLFLAG_RW,
    &ether_input_ckhash, 0, "always check hash");

#define ETHER_KTR_STR           "ifp=%p"
#define ETHER_KTR_ARGS  struct ifnet *ifp
#ifndef KTR_ETHERNET
#define KTR_ETHERNET            KTR_ALL
#endif
KTR_INFO_MASTER(ether);
KTR_INFO(KTR_ETHERNET, ether, pkt_beg, 0, ETHER_KTR_STR, ETHER_KTR_ARGS);
KTR_INFO(KTR_ETHERNET, ether, pkt_end, 1, ETHER_KTR_STR, ETHER_KTR_ARGS);
KTR_INFO(KTR_ETHERNET, ether, disp_beg, 2, ETHER_KTR_STR, ETHER_KTR_ARGS);
KTR_INFO(KTR_ETHERNET, ether, disp_end, 3, ETHER_KTR_STR, ETHER_KTR_ARGS);
#define logether(name, arg)     KTR_LOG(ether_ ## name, arg)

/*
 * 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.
 */
static int
ether_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
             struct rtentry *rt)
{
        struct ether_header *eh, *deh;
        u_char *edst;
        int loop_copy = 0;
        int hlen = ETHER_HDR_LEN;       /* link layer header length */
        struct arpcom *ac = IFP2AC(ifp);
        int error;

        ASSERT_NETISR_NCPUS(mycpuid);
        ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);

        if (ifp->if_flags & IFF_MONITOR)
                gotoerr(ENETDOWN);
        if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING))
                gotoerr(ENETDOWN);

        M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT);
        if (m == NULL)
                return (ENOBUFS);
        m->m_pkthdr.csum_lhlen = sizeof(struct ether_header);
        eh = mtod(m, struct ether_header *);
        edst = eh->ether_dhost;

        /*
         * Fill in the destination ethernet address and frame type.
         */
        switch (dst->sa_family) {
#ifdef INET
        case AF_INET:
                if (!arpresolve(ifp, rt, m, dst, edst))
                        return (0);     /* if not yet resolved */
#ifdef MPLS
                if (m->m_flags & M_MPLSLABELED)
                        eh->ether_type = htons(ETHERTYPE_MPLS);
                else
#endif
                        eh->ether_type = htons(ETHERTYPE_IP);
                break;
#endif
#ifdef INET6
        case AF_INET6:
                if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, edst))
                        return (0);             /* Something bad happenned. */
                eh->ether_type = htons(ETHERTYPE_IPV6);
                break;
#endif
        case pseudo_AF_HDRCMPLT:
        case AF_UNSPEC:
                loop_copy = -1; /* if this is for us, don't do it */
                deh = (struct ether_header *)dst->sa_data;
                memcpy(edst, deh->ether_dhost, ETHER_ADDR_LEN);
                eh->ether_type = deh->ether_type;
                break;

        default:
                if_printf(ifp, "can't handle af%d\n", dst->sa_family);
                gotoerr(EAFNOSUPPORT);
        }

        if (dst->sa_family == pseudo_AF_HDRCMPLT)       /* unlikely */
                memcpy(eh->ether_shost,
                       ((struct ether_header *)dst->sa_data)->ether_shost,
                       ETHER_ADDR_LEN);
        else
                memcpy(eh->ether_shost, ac->ac_enaddr, ETHER_ADDR_LEN);

        /*
         * Bridges require special output handling.
         */
        if (ifp->if_bridge) {
                KASSERT(bridge_output_p != NULL,
                        ("%s: if_bridge not loaded!", __func__));
                return bridge_output_p(ifp, m);
        }
#if 0 /* XXX */
        if (ifp->if_lagg) {
                KASSERT(lagg_output_p != NULL,
                        ("%s: if_lagg not loaded!", __func__));
                return lagg_output_p(ifp, m);
        }
#endif

        /*
         * 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)) {
                int csum_flags = 0;

                if (m->m_pkthdr.csum_flags & CSUM_IP)
                        csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
                if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
                        csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR);
                if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
                        struct mbuf *n;

                        if ((n = m_copypacket(m, M_NOWAIT)) != NULL) {
                                n->m_pkthdr.csum_flags |= csum_flags;
                                if (csum_flags & CSUM_DATA_VALID)
                                        n->m_pkthdr.csum_data = 0xffff;
                                if_simloop(ifp, n, dst->sa_family, hlen);
                        } else
                                IFNET_STAT_INC(ifp, iqdrops, 1);
                } else if (bcmp(eh->ether_dhost, eh->ether_shost,
                                ETHER_ADDR_LEN) == 0) {
                        m->m_pkthdr.csum_flags |= csum_flags;
                        if (csum_flags & CSUM_DATA_VALID)
                                m->m_pkthdr.csum_data = 0xffff;
                        if_simloop(ifp, m, dst->sa_family, hlen);
                        return (0);     /* XXX */
                }
        }

#ifdef CARP
        if (ifp->if_type == IFT_CARP) {
                ifp = carp_parent(ifp);
                if (ifp == NULL)
                        gotoerr(ENETUNREACH);

                ac = IFP2AC(ifp);

                /*
                 * Check precondition again
                 */
                ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);

                if (ifp->if_flags & IFF_MONITOR)
                        gotoerr(ENETDOWN);
                if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) !=
                    (IFF_UP | IFF_RUNNING))
                        gotoerr(ENETDOWN);
        }
#endif

        /* Handle ng_ether(4) processing, if any */
        if (ng_ether_output_p != NULL) {
                /*
                 * Hold BGL and recheck ng_ether_output_p
                 */
                get_mplock();
                if (ng_ether_output_p != NULL) {
                        if ((error = ng_ether_output_p(ifp, &m)) != 0) {
                                rel_mplock();
                                goto bad;
                        }
                        if (m == NULL) {
                                rel_mplock();
                                return (0);
                        }
                }
                rel_mplock();
        }

        /* Continue with link-layer output */
        return ether_output_frame(ifp, m);

bad:
        m_freem(m);
        return (error);
}

/*
 * Returns the bridge interface an ifp is associated
 * with.
 *
 * Only call if ifp->if_bridge != NULL.
 */
struct ifnet *
ether_bridge_interface(struct ifnet *ifp)
{
        if (bridge_interface_p)
                return(bridge_interface_p(ifp->if_bridge));
        return (ifp);
}

/*
 * 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.
 */
int
ether_output_frame(struct ifnet *ifp, struct mbuf *m)
{
        struct ip_fw *rule = NULL;
        int error = 0;
        struct altq_pktattr pktattr;

        ASSERT_IFNET_NOT_SERIALIZED_ALL(ifp);

        if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
                struct m_tag *mtag;

                /* Extract info from dummynet tag */
                mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
                KKASSERT(mtag != NULL);
                rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
                KKASSERT(rule != NULL);

                m_tag_delete(m, mtag);
                m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
        }

        if (ifq_is_enabled(&ifp->if_snd))
                altq_etherclassify(&ifp->if_snd, m, &pktattr);
        crit_enter();
        if ((IPFW_LOADED || IPFW3_LOADED) && ether_ipfw != 0) {
                struct ether_header save_eh, *eh;

                eh = mtod(m, struct ether_header *);
                save_eh = *eh;
                m_adj(m, ETHER_HDR_LEN);
                if (!ether_ipfw_chk(&m, ifp, &rule, eh)) {
                        crit_exit();
                        if (m != NULL) {
                                m_freem(m);
                                return ENOBUFS; /* pkt dropped */
                        } else
                                return 0;       /* consumed e.g. in a pipe */
                }

                /* packet was ok, restore the ethernet header */
                ether_restore_header(&m, eh, &save_eh);
                if (m == NULL) {
                        crit_exit();
                        return ENOBUFS;
                }
        }
        crit_exit();

        /*
         * Queue message on interface, update output statistics if
         * successful, and start output if interface not yet active.
         */
        error = ifq_dispatch(ifp, m, &pktattr);
        return (error);
}

/*
 * ipfw processing for ethernet packets (in and out).
 * The second parameter is NULL from ether_demux(), and ifp from
 * ether_output_frame().
 */
static boolean_t
ether_ipfw_chk(struct mbuf **m0, struct ifnet *dst, struct ip_fw **rule,
               const struct ether_header *eh)
{
        struct ether_header save_eh = *eh;      /* might be a ptr in *m0 */
        struct ip_fw_args args;
        struct m_tag *mtag;
        struct mbuf *m;
        int i;

        if (*rule != NULL && fw_one_pass)
                return TRUE; /* dummynet packet, already partially processed */

        /*
         * I need some amount of data to be contiguous.
         */
        i = min((*m0)->m_pkthdr.len, max_protohdr);
        if ((*m0)->m_len < i) {
                *m0 = m_pullup(*m0, i);
                if (*m0 == NULL)
                        return FALSE;
        }

        /*
         * Clean up tags
         */
        if ((mtag = m_tag_find(*m0, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
                m_tag_delete(*m0, mtag);
        if ((*m0)->m_pkthdr.fw_flags & IPFORWARD_MBUF_TAGGED) {
                mtag = m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL);
                KKASSERT(mtag != NULL);
                m_tag_delete(*m0, mtag);
                (*m0)->m_pkthdr.fw_flags &= ~IPFORWARD_MBUF_TAGGED;
        }

        args.m = *m0;           /* the packet we are looking at         */
        args.oif = dst;         /* destination, if any                  */
        args.rule = *rule;      /* matching rule to restart             */
        args.eh = &save_eh;     /* MAC header for bridged/MAC packets   */
        i = ip_fw_chk_ptr(&args);
        *m0 = args.m;
        *rule = args.rule;

        if (*m0 == NULL)
                return FALSE;

        switch (i) {
        case IP_FW_PASS:
                return TRUE;

        case IP_FW_DIVERT:
        case IP_FW_TEE:
        case IP_FW_DENY:
                /*
                 * XXX at some point add support for divert/forward actions.
                 * If none of the above matches, we have to drop the pkt.
                 */
                return FALSE;

        case IP_FW_DUMMYNET:
                /*
                 * Pass the pkt to dummynet, which consumes it.
                 */
                m = *m0;        /* pass the original to dummynet */
                *m0 = NULL;     /* and nothing back to the caller */

                ether_restore_header(&m, eh, &save_eh);
                if (m == NULL)
                        return FALSE;

                ip_fw_dn_io_ptr(m, args.cookie,
                                dst ? DN_TO_ETH_OUT: DN_TO_ETH_DEMUX, &args);
                ip_dn_queue(m);
                return FALSE;

        default:
                panic("unknown ipfw return value: %d", i);
        }
}

/*
 * Perform common duties while attaching to interface list
 */
void
ether_ifattach(struct ifnet *ifp, const uint8_t *lla,
    lwkt_serialize_t serializer)
{
        ether_ifattach_bpf(ifp, lla, DLT_EN10MB, sizeof(struct ether_header),
            serializer);
}

void
ether_ifattach_bpf(struct ifnet *ifp, const uint8_t *lla,
    u_int dlt, u_int hdrlen, lwkt_serialize_t serializer)
{
        struct sockaddr_dl *sdl;
        char ethstr[ETHER_ADDRSTRLEN + 1];
        struct ifaltq *ifq;
        int i;

        /*
         * If driver does not configure # of mbuf clusters/jclusters
         * that could sit on the device queues for quite some time,
         * we then assume:
         * - The device queues only consume mbuf clusters.
         * - No more than ether_nmbclusters_default (by default 256)
         *   mbuf clusters will sit on the device queues for quite
         *   some time.
         */
        if (ifp->if_nmbclusters <= 0 && ifp->if_nmbjclusters <= 0) {
                if (ether_nmbclusters_default < ETHER_NMBCLUSTERS_DEFMIN) {
                        kprintf("ether nmbclusters %d -> %d\n",
                            ether_nmbclusters_default,
                            ETHER_NMBCLUSTERS_DEFAULT);
                        ether_nmbclusters_default = ETHER_NMBCLUSTERS_DEFAULT;
                }
                ifp->if_nmbclusters = ether_nmbclusters_default;
        }

        ifp->if_type = IFT_ETHER;
        ifp->if_addrlen = ETHER_ADDR_LEN;
        ifp->if_hdrlen = ETHER_HDR_LEN;
        if_attach(ifp, serializer);
        ifq = &ifp->if_snd;
        for (i = 0; i < ifq->altq_subq_cnt; ++i) {
                struct ifaltq_subque *ifsq = ifq_get_subq(ifq, i);

                ifsq->ifsq_maxbcnt = ifsq->ifsq_maxlen *
                    (ETHER_MAX_LEN - ETHER_CRC_LEN);
        }
        ifp->if_mtu = ETHERMTU;
        if (ifp->if_tsolen <= 0) {
                if ((ether_tsolen_default / ETHERMTU) < 2) {
                        kprintf("ether TSO maxlen %d -> %d\n",
                            ether_tsolen_default, ETHER_TSOLEN_DEFAULT);
                        ether_tsolen_default = ETHER_TSOLEN_DEFAULT;
                }
                ifp->if_tsolen = ether_tsolen_default;
        }
        if (ifp->if_baudrate == 0)
                ifp->if_baudrate = 10000000;
        ifp->if_output = ether_output;
        ifp->if_input = ether_input;
        ifp->if_resolvemulti = ether_resolvemulti;
        ifp->if_broadcastaddr = etherbroadcastaddr;
        sdl = IF_LLSOCKADDR(ifp);
        sdl->sdl_type = IFT_ETHER;
        sdl->sdl_alen = ifp->if_addrlen;
        bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
        /*
         * XXX Keep the current drivers happy.
         * XXX Remove once all drivers have been cleaned up
         */
        if (lla != IFP2AC(ifp)->ac_enaddr)
                bcopy(lla, IFP2AC(ifp)->ac_enaddr, ifp->if_addrlen);
        bpfattach(ifp, dlt, hdrlen);
        if (ng_ether_attach_p != NULL)
                (*ng_ether_attach_p)(ifp);

        if_printf(ifp, "MAC address: %s\n", kether_ntoa(lla, ethstr));
}

/*
 * Perform common duties while detaching an Ethernet interface
 */
void
ether_ifdetach(struct ifnet *ifp)
{
        if_down(ifp);

        if (ng_ether_detach_p != NULL)
                (*ng_ether_detach_p)(ifp);
        bpfdetach(ifp);
        if_detach(ifp);
}

int
ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
        struct ifaddr *ifa = (struct ifaddr *) data;
        struct ifreq *ifr = (struct ifreq *) data;
        int error = 0;

#define IF_INIT(ifp) \
do { \
        if (((ifp)->if_flags & IFF_UP) == 0) { \
                (ifp)->if_flags |= IFF_UP; \
                (ifp)->if_init((ifp)->if_softc); \
        } \
} while (0)

        ASSERT_IFNET_SERIALIZED_ALL(ifp);

        switch (command) {
        case SIOCSIFADDR:
                switch (ifa->ifa_addr->sa_family) {
#ifdef INET
                case AF_INET:
                        IF_INIT(ifp);   /* before arpwhohas */
                        arp_ifinit(ifp, ifa);
                        break;
#endif
                default:
                        IF_INIT(ifp);
                        break;
                }
                break;

        case SIOCGIFADDR:
                bcopy(IFP2AC(ifp)->ac_enaddr,
                      ((struct sockaddr *)ifr->ifr_data)->sa_data,
                      ETHER_ADDR_LEN);
                break;

        case SIOCSIFMTU:
                /*
                 * Set the interface MTU.
                 */
                if (ifr->ifr_mtu > ETHERMTU) {
                        error = EINVAL;
                } else {
                        ifp->if_mtu = ifr->ifr_mtu;
                }
                break;
        default:
                error = EINVAL;
                break;
        }
        return (error);

#undef IF_INIT
}

static int
ether_resolvemulti(
        struct ifnet *ifp,
        struct sockaddr **llsa,
        struct sockaddr *sa)
{
        struct sockaddr_dl *sdl;
#ifdef INET
        struct sockaddr_in *sin;
#endif
#ifdef INET6
        struct sockaddr_in6 *sin6;
#endif
        u_char *e_addr;

        switch(sa->sa_family) {
        case AF_LINK:
                /*
                 * No mapping needed. Just check that it's a valid MC address.
                 */
                sdl = (struct sockaddr_dl *)sa;
                e_addr = LLADDR(sdl);
                if ((e_addr[0] & 1) != 1)
                        return EADDRNOTAVAIL;
                *llsa = NULL;
                return 0;

#ifdef INET
        case AF_INET:
                sin = (struct sockaddr_in *)sa;
                if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
                        return EADDRNOTAVAIL;
                sdl = kmalloc(sizeof *sdl, M_IFMADDR, M_WAITOK | M_ZERO);
                sdl->sdl_len = sizeof *sdl;
                sdl->sdl_family = AF_LINK;
                sdl->sdl_index = ifp->if_index;
                sdl->sdl_type = IFT_ETHER;
                sdl->sdl_alen = ETHER_ADDR_LEN;
                e_addr = LLADDR(sdl);
                ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
                *llsa = (struct sockaddr *)sdl;
                return 0;
#endif
#ifdef INET6
        case AF_INET6:
                sin6 = (struct sockaddr_in6 *)sa;
                if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
                        /*
                         * An IP6 address of 0 means listen to all
                         * of the Ethernet multicast address used for IP6.
                         * (This is used for multicast routers.)
                         */
                        ifp->if_flags |= IFF_ALLMULTI;
                        *llsa = NULL;
                        return 0;
                }
                if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
                        return EADDRNOTAVAIL;
                sdl = kmalloc(sizeof *sdl, M_IFMADDR, M_WAITOK | M_ZERO);
                sdl->sdl_len = sizeof *sdl;
                sdl->sdl_family = AF_LINK;
                sdl->sdl_index = ifp->if_index;
                sdl->sdl_type = IFT_ETHER;
                sdl->sdl_alen = ETHER_ADDR_LEN;
                e_addr = LLADDR(sdl);
                ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
                *llsa = (struct sockaddr *)sdl;
                return 0;
#endif

        default:
                /*
                 * Well, the text isn't quite right, but it's the name
                 * that counts...
                 */
                return EAFNOSUPPORT;
        }
}

#if 0
/*
 * This is for reference.  We have a table-driven version
 * of the little-endian crc32 generator, which is faster
 * than the double-loop.
 */
uint32_t
ether_crc32_le(const uint8_t *buf, size_t len)
{
        uint32_t c, crc, carry;
        size_t i, j;

        crc = 0xffffffffU;      /* initial value */

        for (i = 0; i < len; i++) {
                c = buf[i];
                for (j = 0; j < 8; j++) {
                        carry = ((crc & 0x01) ? 1 : 0) ^ (c & 0x01);
                        crc >>= 1;
                        c >>= 1;
                        if (carry)
                                crc = (crc ^ ETHER_CRC_POLY_LE);
                }
        }

        return (crc);
}
#else
uint32_t
ether_crc32_le(const uint8_t *buf, size_t len)
{
        static const uint32_t crctab[] = {
                0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
                0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
                0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
                0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
        };
        uint32_t crc;
        size_t i;

        crc = 0xffffffffU;      /* initial value */

        for (i = 0; i < len; i++) {
                crc ^= buf[i];
                crc = (crc >> 4) ^ crctab[crc & 0xf];
                crc = (crc >> 4) ^ crctab[crc & 0xf];
        }

        return (crc);
}
#endif

uint32_t
ether_crc32_be(const uint8_t *buf, size_t len)
{
        uint32_t c, crc, carry;
        size_t i, j;

        crc = 0xffffffffU;      /* initial value */

        for (i = 0; i < len; i++) {
                c = buf[i];
                for (j = 0; j < 8; j++) {
                        carry = ((crc & 0x80000000U) ? 1 : 0) ^ (c & 0x01);
                        crc <<= 1;
                        c >>= 1;
                        if (carry)
                                crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
                }
        }

        return (crc);
}

/*
 * find the size of ethernet header, and call classifier
 */
void
altq_etherclassify(struct ifaltq *ifq, struct mbuf *m,
                   struct altq_pktattr *pktattr)
{
        struct ether_header *eh;
        uint16_t ether_type;
        int hlen, af, hdrsize;

        hlen = sizeof(struct ether_header);
        eh = mtod(m, struct ether_header *);

        ether_type = ntohs(eh->ether_type);
        if (ether_type < ETHERMTU) {
                /* ick! LLC/SNAP */
                struct llc *llc = (struct llc *)(eh + 1);
                hlen += 8;

                if (m->m_len < hlen ||
                    llc->llc_dsap != LLC_SNAP_LSAP ||
                    llc->llc_ssap != LLC_SNAP_LSAP ||
                    llc->llc_control != LLC_UI)
                        goto bad;  /* not snap! */

                ether_type = ntohs(llc->llc_un.type_snap.ether_type);
        }

        if (ether_type == ETHERTYPE_IP) {
                af = AF_INET;
                hdrsize = 20;  /* sizeof(struct ip) */
#ifdef INET6
        } else if (ether_type == ETHERTYPE_IPV6) {
                af = AF_INET6;
                hdrsize = 40;  /* sizeof(struct ip6_hdr) */
#endif
        } else
                goto bad;

        while (m->m_len <= hlen) {
                hlen -= m->m_len;
                m = m->m_next;
        }
        if (m->m_len < hlen + hdrsize) {
                /*
                 * ip header is not in a single mbuf.  this should not
                 * happen in the current code.
                 * (todo: use m_pulldown in the future)
                 */
                goto bad;
        }
        m->m_data += hlen;
        m->m_len -= hlen;
        ifq_classify(ifq, m, af, pktattr);
        m->m_data -= hlen;
        m->m_len += hlen;

        return;

bad:
        pktattr->pattr_class = NULL;
        pktattr->pattr_hdr = NULL;
        pktattr->pattr_af = AF_UNSPEC;
}

static void
ether_restore_header(struct mbuf **m0, const struct ether_header *eh,
                     const struct ether_header *save_eh)
{
        struct mbuf *m = *m0;

        ether_restore_hdr++;

        /*
         * Prepend the header, optimize for the common case of
         * eh pointing into the mbuf.
         */
        if ((const void *)(eh + 1) == (void *)m->m_data) {
                m->m_data -= ETHER_HDR_LEN;
                m->m_len += ETHER_HDR_LEN;
                m->m_pkthdr.len += ETHER_HDR_LEN;
        } else {
                ether_prepend_hdr++;

                M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
                if (m != NULL) {
                        bcopy(save_eh, mtod(m, struct ether_header *),
                              ETHER_HDR_LEN);
                }
        }
        *m0 = m;
}

/*
 * Upper layer processing for a received Ethernet packet.
 */
void
ether_demux_oncpu(struct ifnet *ifp, struct mbuf *m)
{
        struct ether_header *eh;
        int isr, discard = 0;
        u_short ether_type;
        struct ip_fw *rule = NULL;

        M_ASSERTPKTHDR(m);
        KASSERT(m->m_len >= ETHER_HDR_LEN,
                ("ether header is not contiguous!"));

        eh = mtod(m, struct ether_header *);

        if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
                struct m_tag *mtag;

                /* Extract info from dummynet tag */
                mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
                KKASSERT(mtag != NULL);
                rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
                KKASSERT(rule != NULL);

                m_tag_delete(m, mtag);
                m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;

                /* packet is passing the second time */
                goto post_stats;
        }

        /*
         * We got a packet which 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.  We defer the packet discarding until the
         * vlan processing is done, so that vlan/bridge or vlan/netgraph
         * could work.
         */
        if (((ifp->if_flags & (IFF_PROMISC | IFF_PPROMISC)) == IFF_PROMISC) &&
            !ETHER_IS_MULTICAST(eh->ether_dhost) &&
            bcmp(eh->ether_dhost, IFP2AC(ifp)->ac_enaddr, ETHER_ADDR_LEN)) {
                if (ether_debug & 1) {
                        kprintf("%02x:%02x:%02x:%02x:%02x:%02x "
                                "%02x:%02x:%02x:%02x:%02x:%02x "
                                "%04x vs %02x:%02x:%02x:%02x:%02x:%02x\n",
                                eh->ether_dhost[0],
                                eh->ether_dhost[1],
                                eh->ether_dhost[2],
                                eh->ether_dhost[3],
                                eh->ether_dhost[4],
                                eh->ether_dhost[5],
                                eh->ether_shost[0],
                                eh->ether_shost[1],
                                eh->ether_shost[2],
                                eh->ether_shost[3],
                                eh->ether_shost[4],
                                eh->ether_shost[5],
                                eh->ether_type,
                                ((u_char *)IFP2AC(ifp)->ac_enaddr)[0],
                                ((u_char *)IFP2AC(ifp)->ac_enaddr)[1],
                                ((u_char *)IFP2AC(ifp)->ac_enaddr)[2],
                                ((u_char *)IFP2AC(ifp)->ac_enaddr)[3],
                                ((u_char *)IFP2AC(ifp)->ac_enaddr)[4],
                                ((u_char *)IFP2AC(ifp)->ac_enaddr)[5]
                        );
                }
                if ((ether_debug & 2) == 0)
                        discard = 1;
        }

post_stats:
        if ((IPFW_LOADED || IPFW3_LOADED) && ether_ipfw != 0 && !discard) {
                struct ether_header save_eh = *eh;

                /* XXX old crufty stuff, needs to be removed */
                m_adj(m, sizeof(struct ether_header));

                if (!ether_ipfw_chk(&m, NULL, &rule, eh)) {
                        m_freem(m);
                        return;
                }

                ether_restore_header(&m, eh, &save_eh);
                if (m == NULL)
                        return;
                eh = mtod(m, struct ether_header *);
        }

        ether_type = ntohs(eh->ether_type);
        KKASSERT(ether_type != ETHERTYPE_VLAN);

        /* Handle input from a lagg(4) port */
        if (ifp->if_type == IFT_IEEE8023ADLAG) {
                KASSERT(lagg_input_p != NULL,
                    ("%s: if_lagg not loaded!", __func__));
                (*lagg_input_p)(ifp, m);
                return;
        }

        if (m->m_flags & M_VLANTAG) {
                void (*vlan_input_func)(struct mbuf *);

                vlan_input_func = vlan_input_p;
                /* Make sure 'vlan_input_func' is really used. */
                cpu_ccfence();
                if (vlan_input_func != NULL) {
                        vlan_input_func(m);
                } else {
                        IFNET_STAT_INC(m->m_pkthdr.rcvif, noproto, 1);
                        m_freem(m);
                }
                return;
        }

        /*
         * If we have been asked to discard this packet
         * (e.g. not for us), drop it before entering
         * the upper layer.
         */
        if (discard) {
                m_freem(m);
                return;
        }

        /*
         * Clear protocol specific flags,
         * before entering the upper layer.
         */
        m->m_flags &= ~M_ETHER_FLAGS;

        /* Strip ethernet header. */
        m_adj(m, sizeof(struct ether_header));

        switch (ether_type) {
#ifdef INET
        case ETHERTYPE_IP:
                if ((m->m_flags & M_LENCHECKED) == 0) {
                        if (!ip_lengthcheck(&m, 0))
                                return;
                }
                if (ipflow_fastforward(m))
                        return;
                isr = NETISR_IP;
                break;

        case ETHERTYPE_ARP:
                if (ifp->if_flags & IFF_NOARP) {
                        /* Discard packet if ARP is disabled on interface */
                        m_freem(m);
                        return;
                }
                isr = NETISR_ARP;
                break;
#endif

#ifdef INET6
        case ETHERTYPE_IPV6:
                isr = NETISR_IPV6;
                break;
#endif

#ifdef MPLS
        case ETHERTYPE_MPLS:
        case ETHERTYPE_MPLS_MCAST:
                /* Should have been set by ether_input(). */
                KKASSERT(m->m_flags & M_MPLSLABELED);
                isr = NETISR_MPLS;
                break;
#endif

        default:
                /*
                 * The accurate msgport is not determined before
                 * we reach here, so recharacterize packet.
                 */
                m->m_flags &= ~M_HASH;
                if (ng_ether_input_orphan_p != NULL) {
                        /*
                         * Put back the ethernet header so netgraph has a
                         * consistent view of inbound packets.
                         */
                        M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
                        if (m == NULL) {
                                /*
                                 * M_PREPEND frees the mbuf in case of failure.
                                 */
                                return;
                        }
                        /*
                         * Hold BGL and recheck ng_ether_input_orphan_p
                         */
                        get_mplock();
                        if (ng_ether_input_orphan_p != NULL) {
                                ng_ether_input_orphan_p(ifp, m);
                                rel_mplock();
                                return;
                        }
                        rel_mplock();
                }
                m_freem(m);
                return;
        }

        if (m->m_flags & M_HASH) {
                if (&curthread->td_msgport ==
                    netisr_hashport(m->m_pkthdr.hash)) {
                        netisr_handle(isr, m);
                        return;
                } else {
                        /*
                         * XXX Something is wrong,
                         * we probably should panic here!
                         */
                        m->m_flags &= ~M_HASH;
                        atomic_add_long(&ether_input_wronghash, 1);
                }
        }
#ifdef RSS_DEBUG
        atomic_add_long(&ether_input_requeue, 1);
#endif
        netisr_queue(isr, m);
}

/*
 * First we perform any link layer operations, then continue to the
 * upper layers with ether_demux_oncpu().
 */
static void
ether_input_oncpu(struct ifnet *ifp, struct mbuf *m)
{
#ifdef CARP
        void *carp;
#endif

        if ((ifp->if_flags & (IFF_UP | IFF_MONITOR)) != IFF_UP) {
                /*
                 * Receiving interface's flags are changed, when this
                 * packet is waiting for processing; discard it.
                 */
                m_freem(m);
                return;
        }

        /*
         * Tap the packet off here for a bridge.  bridge_input()
         * will return NULL if it has consumed the packet, otherwise
         * it gets processed as normal.  Note that bridge_input()
         * will always return the original packet if we need to
         * process it locally.
         */
        if (ifp->if_bridge) {
                KASSERT(bridge_input_p != NULL,
                        ("%s: if_bridge not loaded!", __func__));

                if(m->m_flags & M_ETHER_BRIDGED) {
                        m->m_flags &= ~M_ETHER_BRIDGED;
                } else {
                        m = bridge_input_p(ifp, m);
                        if (m == NULL)
                                return;

                        KASSERT(ifp == m->m_pkthdr.rcvif,
                                ("bridge_input_p changed rcvif"));
                }
        }

#ifdef CARP
        carp = ifp->if_carp;
        if (carp) {
                m = carp_input(carp, m);
                if (m == NULL)
                        return;
                KASSERT(ifp == m->m_pkthdr.rcvif,
                    ("carp_input changed rcvif"));
        }
#endif

        /* Handle ng_ether(4) processing, if any */
        if (ng_ether_input_p != NULL) {
                /*
                 * Hold BGL and recheck ng_ether_input_p
                 */
                get_mplock();
                if (ng_ether_input_p != NULL)
                        ng_ether_input_p(ifp, &m);
                rel_mplock();

                if (m == NULL)
                        return;
        }

        /* Continue with upper layer processing */
        ether_demux_oncpu(ifp, m);
}

/*
 * Perform certain functions of ether_input():
 * - Test IFF_UP
 * - Update statistics
 * - Run bpf(4) tap if requested
 * Then pass the packet to ether_input_oncpu().
 *
 * This function should be used by pseudo interface (e.g. vlan(4)),
 * when it tries to claim that the packet is received by it.
 *
 * REINPUT_KEEPRCVIF
 * REINPUT_RUNBPF
 */
void
ether_reinput_oncpu(struct ifnet *ifp, struct mbuf *m, int reinput_flags)
{
        /* Discard packet if interface is not up */
        if (!(ifp->if_flags & IFF_UP)) {
                m_freem(m);
                return;
        }

        /*
         * Change receiving interface.  The bridge will often pass a flag to
         * ask that this not be done so ARPs get applied to the correct
         * side.
         */
        if ((reinput_flags & REINPUT_KEEPRCVIF) == 0 ||
            m->m_pkthdr.rcvif == NULL) {
                m->m_pkthdr.rcvif = ifp;
        }

        /* Update statistics */
        IFNET_STAT_INC(ifp, ipackets, 1);
        IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len);
        if (m->m_flags & (M_MCAST | M_BCAST))
                IFNET_STAT_INC(ifp, imcasts, 1);

        if (reinput_flags & REINPUT_RUNBPF)
                BPF_MTAP(ifp, m);

        ether_input_oncpu(ifp, m);
}

static __inline boolean_t
ether_vlancheck(struct mbuf **m0)
{
        struct mbuf *m = *m0;
        struct ether_header *eh;
        uint16_t ether_type;

        eh = mtod(m, struct ether_header *);
        ether_type = ntohs(eh->ether_type);

        if (ether_type == ETHERTYPE_VLAN && (m->m_flags & M_VLANTAG) == 0) {
                /*
                 * Extract vlan tag if hardware does not do it for us
                 */
                vlan_ether_decap(&m);
                if (m == NULL)
                        goto failed;

                eh = mtod(m, struct ether_header *);
                ether_type = ntohs(eh->ether_type);
        }

        if (ether_type == ETHERTYPE_VLAN && (m->m_flags & M_VLANTAG)) {
                /*
                 * To prevent possible dangerous recursion,
                 * we don't do vlan-in-vlan
                 */
                IFNET_STAT_INC(m->m_pkthdr.rcvif, noproto, 1);
                goto failed;
        }
        KKASSERT(ether_type != ETHERTYPE_VLAN);

        m->m_flags |= M_ETHER_VLANCHECKED;
        *m0 = m;
        return TRUE;
failed:
        if (m != NULL)
                m_freem(m);
        *m0 = NULL;
        return FALSE;
}

static void
ether_input_handler(netmsg_t nmsg)
{
        struct netmsg_packet *nmp = &nmsg->packet;      /* actual size */
        struct ether_header *eh;
        struct ifnet *ifp;
        struct mbuf *m;

        m = nmp->nm_packet;
        M_ASSERTPKTHDR(m);

        if ((m->m_flags & M_ETHER_VLANCHECKED) == 0) {
                if (!ether_vlancheck(&m)) {
                        KKASSERT(m == NULL);
                        return;
                }
        }
        if ((m->m_flags & (M_HASH | M_CKHASH)) == (M_HASH | M_CKHASH) ||
            __predict_false(ether_input_ckhash)) {
                int isr;

                /*
                 * Need to verify the hash supplied by the hardware
                 * which could be wrong.
                 */
                m->m_flags &= ~(M_HASH | M_CKHASH);
                isr = ether_characterize(&m);
                if (m == NULL)
                        return;
                KKASSERT(m->m_flags & M_HASH);

                if (netisr_hashcpu(m->m_pkthdr.hash) != mycpuid) {
                        /*
                         * Wrong hardware supplied hash; redispatch
                         */
                        ether_dispatch(isr, m, -1);
                        if (__predict_false(ether_input_ckhash))
                                atomic_add_long(&ether_input_wronghwhash, 1);
                        return;
                }
        }
        ifp = m->m_pkthdr.rcvif;

        eh = mtod(m, struct ether_header *);
        if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
                if (bcmp(ifp->if_broadcastaddr, eh->ether_dhost,
                         ifp->if_addrlen) == 0)
                        m->m_flags |= M_BCAST;
                else
                        m->m_flags |= M_MCAST;
                IFNET_STAT_INC(ifp, imcasts, 1);
        }

        ether_input_oncpu(ifp, m);
}

/*
 * Send the packet to the target netisr msgport
 *
 * At this point the packet must be characterized (M_HASH set),
 * so we know which netisr to send it to.
 */
static void
ether_dispatch(int isr, struct mbuf *m, int cpuid)
{
        struct netmsg_packet *pmsg;
        int target_cpuid;

        KKASSERT(m->m_flags & M_HASH);
        target_cpuid = netisr_hashcpu(m->m_pkthdr.hash);

        pmsg = &m->m_hdr.mh_netmsg;
        netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport,
                    0, ether_input_handler);
        pmsg->nm_packet = m;
        pmsg->base.lmsg.u.ms_result = isr;

        logether(disp_beg, NULL);
        if (target_cpuid == cpuid) {
                lwkt_sendmsg_oncpu(netisr_cpuport(target_cpuid),
                    &pmsg->base.lmsg);
        } else {
                lwkt_sendmsg(netisr_cpuport(target_cpuid),
                    &pmsg->base.lmsg);
        }
        logether(disp_end, NULL);
}

/*
 * Process a received Ethernet packet.
 *
 * The ethernet header is assumed to be in the mbuf so the caller
 * MUST MAKE SURE that there are at least sizeof(struct ether_header)
 * bytes in the first mbuf.
 *
 * If the caller knows that the current thread is stick to the current
 * cpu, e.g. the interrupt thread or the netisr thread, the current cpuid
 * (mycpuid) should be passed through 'cpuid' argument.  Else -1 should
 * be passed as 'cpuid' argument.
 */
void
ether_input(struct ifnet *ifp, struct mbuf *m, const struct pktinfo *pi,
    int cpuid)
{
        int isr;

        M_ASSERTPKTHDR(m);

        /* Discard packet if interface is not up */
        if (!(ifp->if_flags & IFF_UP)) {
                m_freem(m);
                return;
        }

        if (m->m_len < sizeof(struct ether_header)) {
                /* XXX error in the caller. */
                m_freem(m);
                return;
        }

        m->m_pkthdr.rcvif = ifp;

        logether(pkt_beg, ifp);

        ETHER_BPF_MTAP(ifp, m);

        IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len);

        if (ifp->if_flags & IFF_MONITOR) {
                struct ether_header *eh;

                eh = mtod(m, struct ether_header *);
                if (ETHER_IS_MULTICAST(eh->ether_dhost))
                        IFNET_STAT_INC(ifp, imcasts, 1);

                /*
                 * Interface marked for monitoring; discard packet.
                 */
                m_freem(m);

                logether(pkt_end, ifp);
                return;
        }

        /*
         * If the packet has been characterized (pi->pi_netisr / M_HASH)
         * we can dispatch it immediately with trivial checks.
         */
        if (pi != NULL && (m->m_flags & M_HASH)) {
#ifdef RSS_DEBUG
                atomic_add_long(&ether_pktinfo_try, 1);
#endif
                netisr_hashcheck(pi->pi_netisr, m, pi);
                if (m->m_flags & M_HASH) {
                        ether_dispatch(pi->pi_netisr, m, cpuid);
#ifdef RSS_DEBUG
                        atomic_add_long(&ether_pktinfo_hit, 1);
#endif
                        logether(pkt_end, ifp);
                        return;
                }
        }
#ifdef RSS_DEBUG
        else if (ifp->if_capenable & IFCAP_RSS) {
                if (pi == NULL)
                        atomic_add_long(&ether_rss_nopi, 1);
                else
                        atomic_add_long(&ether_rss_nohash, 1);
        }
#endif

        /*
         * Packet hash will be recalculated by software, so clear
         * the M_HASH and M_CKHASH flag set by the driver; the hash
         * value calculated by the hardware may not be exactly what
         * we want.
         */
        m->m_flags &= ~(M_HASH | M_CKHASH);

        if (!ether_vlancheck(&m)) {
                KKASSERT(m == NULL);
                logether(pkt_end, ifp);
                return;
        }

        isr = ether_characterize(&m);
        if (m == NULL) {
                logether(pkt_end, ifp);
                return;
        }

        /*
         * Finally dispatch it
         */
        ether_dispatch(isr, m, cpuid);

        logether(pkt_end, ifp);
}

static int
ether_characterize(struct mbuf **m0)
{
        struct mbuf *m = *m0;
        struct ether_header *eh;
        uint16_t ether_type;
        int isr;

        eh = mtod(m, struct ether_header *);
        ether_type = ntohs(eh->ether_type);

        /*
         * Map ether type to netisr id.
         */
        switch (ether_type) {
#ifdef INET
        case ETHERTYPE_IP:
                isr = NETISR_IP;
                break;

        case ETHERTYPE_ARP:
                isr = NETISR_ARP;
                break;
#endif

#ifdef INET6
        case ETHERTYPE_IPV6:
                isr = NETISR_IPV6;
                break;
#endif

#ifdef MPLS
        case ETHERTYPE_MPLS:
        case ETHERTYPE_MPLS_MCAST:
                m->m_flags |= M_MPLSLABELED;
                isr = NETISR_MPLS;
                break;
#endif

        default:
                /*
                 * NETISR_MAX is an invalid value; it is chosen to let
                 * netisr_characterize() know that we have no clear
                 * idea where this packet should go.
                 */
                isr = NETISR_MAX;
                break;
        }

        /*
         * Ask the isr to characterize the packet since we couldn't.
         * This is an attempt to optimally get us onto the correct protocol
         * thread.
         */
        netisr_characterize(isr, &m, sizeof(struct ether_header));

        *m0 = m;
        return isr;
}

static void
ether_demux_handler(netmsg_t nmsg)
{
        struct netmsg_packet *nmp = &nmsg->packet;      /* actual size */
        struct ifnet *ifp;
        struct mbuf *m;

        m = nmp->nm_packet;
        M_ASSERTPKTHDR(m);
        ifp = m->m_pkthdr.rcvif;

        ether_demux_oncpu(ifp, m);
}

void
ether_demux(struct mbuf *m)
{
        struct netmsg_packet *pmsg;
        int isr;

        isr = ether_characterize(&m);
        if (m == NULL)
                return;

        KKASSERT(m->m_flags & M_HASH);
        pmsg = &m->m_hdr.mh_netmsg;
        netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport,
            0, ether_demux_handler);
        pmsg->nm_packet = m;
        pmsg->base.lmsg.u.ms_result = isr;

        lwkt_sendmsg(netisr_hashport(m->m_pkthdr.hash), &pmsg->base.lmsg);
}

u_char *
kether_aton(const char *macstr, u_char *addr)
{
        unsigned int o0, o1, o2, o3, o4, o5;
        int n;

        if (macstr == NULL || addr == NULL)
                return NULL;

        n = ksscanf(macstr, "%x:%x:%x:%x:%x:%x", &o0, &o1, &o2,
            &o3, &o4, &o5);
        if (n != 6)
                return NULL;

        addr[0] = o0;
        addr[1] = o1;
        addr[2] = o2;
        addr[3] = o3;
        addr[4] = o4;
        addr[5] = o5;

        return addr;
}

char *
kether_ntoa(const u_char *addr, char *buf)
{
        int len = ETHER_ADDRSTRLEN + 1;
        int n;

        n = ksnprintf(buf, len, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0],
            addr[1], addr[2], addr[3], addr[4], addr[5]);

        if (n < 17)
                return NULL;

        return buf;
}

MODULE_VERSION(ether, 1);