/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2015 Joyent, Inc. All rights reserved.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/stropts.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/socket_proto.h>
#include <sys/sockio.h>
#include <sys/strsun.h>
#include <sys/kstat.h>
#include <sys/modctl.h>
#include <sys/policy.h>
#include <sys/priv_const.h>
#include <sys/tihdr.h>
#include <sys/zone.h>
#include <sys/time.h>
#include <sys/ethernet.h>
#include <sys/llc1.h>
#include <fs/sockfs/sockcommon.h>
#include <net/if.h>
#include <inet/ip_arp.h>

#include <sys/dls.h>
#include <sys/mac.h>
#include <sys/mac_client.h>
#include <sys/mac_provider.h>
#include <sys/mac_client_priv.h>

#include <netpacket/packet.h>

static void pfp_close(mac_handle_t, mac_client_handle_t);
static int pfp_dl_to_arphrd(int);
static int pfp_getpacket_sockopt(sock_lower_handle_t, int, void *,
    socklen_t *);
static int pfp_ifreq_getlinkid(intptr_t, struct ifreq *, datalink_id_t *, int);
static int pfp_lifreq_getlinkid(intptr_t, struct lifreq *, datalink_id_t *,
    int);
static int pfp_open_index(int, mac_handle_t *, mac_client_handle_t *,
    cred_t *);
static void pfp_packet(void *, mac_resource_handle_t, mblk_t *, boolean_t);
static void pfp_release_bpf(struct pfpsock *);
static int pfp_set_promisc(struct pfpsock *, mac_client_promisc_type_t);
static int pfp_setsocket_sockopt(sock_lower_handle_t, int, const void *,
    socklen_t);
static int pfp_setpacket_sockopt(sock_lower_handle_t, int, const void *,
    socklen_t);

/*
 * PFP sockfs operations
 * Most are currently no-ops because they have no meaning for a connectionless
 * socket.
 */
static void sdpfp_activate(sock_lower_handle_t, sock_upper_handle_t,
    sock_upcalls_t *, int, struct cred *);
static int sdpfp_bind(sock_lower_handle_t, struct sockaddr *, socklen_t,
    struct cred *);
static int sdpfp_close(sock_lower_handle_t, int, struct cred *);
static void sdpfp_clr_flowctrl(sock_lower_handle_t);
static int sdpfp_getsockopt(sock_lower_handle_t, int, int, void *,
    socklen_t *, struct cred *);
static int sdpfp_ioctl(sock_lower_handle_t, int, intptr_t, int, int32_t *,
    struct cred *);
static int sdpfp_senduio(sock_lower_handle_t, struct uio *, struct nmsghdr *,
    struct cred *);
static int sdpfp_setsockopt(sock_lower_handle_t, int, int, const void *,
    socklen_t, struct cred *);

static sock_lower_handle_t sockpfp_create(int, int, int, sock_downcalls_t **,
    uint_t *, int *, int, cred_t *);

static int sockpfp_init(void);
static void sockpfp_fini(void);

static kstat_t *pfp_ksp;
static pfp_kstats_t ks_stats;
static pfp_kstats_t pfp_kstats = {
        /*
         * Each one of these kstats is a different return path in handling
         * a packet received from the mac layer.
         */
        { "recvMacHeaderFail",  KSTAT_DATA_UINT64 },
        { "recvBadProtocol",    KSTAT_DATA_UINT64 },
        { "recvAllocbFail",     KSTAT_DATA_UINT64 },
        { "recvOk",             KSTAT_DATA_UINT64 },
        { "recvFail",           KSTAT_DATA_UINT64 },
        { "recvFiltered",       KSTAT_DATA_UINT64 },
        { "recvFlowControl",    KSTAT_DATA_UINT64 },
        /*
         * A global set of counters is maintained to track the behaviour
         * of the system (kernel & applications) in sending packets.
         */
        { "sendUnbound",        KSTAT_DATA_UINT64 },
        { "sendFailed",         KSTAT_DATA_UINT64 },
        { "sendTooBig",         KSTAT_DATA_UINT64 },
        { "sendAllocFail",      KSTAT_DATA_UINT64 },
        { "sendUiomoveFail",    KSTAT_DATA_UINT64 },
        { "sendNoMemory",       KSTAT_DATA_UINT64 },
        { "sendOpenFail",       KSTAT_DATA_UINT64 },
        { "sendWrongFamily",    KSTAT_DATA_UINT64 },
        { "sendShortMsg",       KSTAT_DATA_UINT64 },
        { "sendOk",             KSTAT_DATA_UINT64 }
};

sock_downcalls_t pfp_downcalls = {
        sdpfp_activate,
        sock_accept_notsupp,
        sdpfp_bind,
        sock_listen_notsupp,
        sock_connect_notsupp,
        sock_getpeername_notsupp,
        sock_getsockname_notsupp,
        sdpfp_getsockopt,
        sdpfp_setsockopt,
        sock_send_notsupp,
        sdpfp_senduio,
        NULL,
        sock_poll_notsupp,
        sock_shutdown_notsupp,
        sdpfp_clr_flowctrl,
        sdpfp_ioctl,
        sdpfp_close,
};

static smod_reg_t sinfo = {
        SOCKMOD_VERSION,
        "sockpfp",
        SOCK_UC_VERSION,
        SOCK_DC_VERSION,
        sockpfp_create,
        NULL
};

static int accepted_protos[3][2] = {
        { ETH_P_ALL,    0 },
        { ETH_P_802_2,  LLC_SNAP_SAP },
        { ETH_P_803_3,  0 },
};

/*
 * This sets an upper bound on the size of the receive buffer for a PF_PACKET
 * socket. More properly, this should be controlled through ipadm, ala TCP, UDP,
 * SCTP, etc. Until that's done, this provides a hard cap of 4 MB and allows an
 * opportunity for it to be changed, should it be needed.
 */
int sockmod_pfp_rcvbuf_max = 1024 * 1024 * 4;

/*
 * Module linkage information for the kernel.
 */
static struct modlsockmod modlsockmod = {
        &mod_sockmodops, "PF Packet socket module", &sinfo
};

static struct modlinkage modlinkage = {
        MODREV_1,
        &modlsockmod,
        NULL
};

int
_init(void)
{
        int error;

        error = sockpfp_init();
        if (error != 0)
                return (error);

        error = mod_install(&modlinkage);
        if (error != 0)
                sockpfp_fini();

        return (error);
}

int
_fini(void)
{
        int error;

        error = mod_remove(&modlinkage);
        if (error == 0)
                sockpfp_fini();

        return (error);
}

int
_info(struct modinfo *modinfop)
{
        return (mod_info(&modlinkage, modinfop));
}

/*
 * sockpfp_init: called as part of the initialisation of the module when
 * loaded into the kernel.
 *
 * Being able to create and record the kstats data in the kernel is not
 * considered to be vital to the operation of this kernel module, thus
 * its failure is tolerated.
 */
static int
sockpfp_init(void)
{
        (void) memset(&ks_stats, 0, sizeof (ks_stats));

        (void) memcpy(&ks_stats, &pfp_kstats, sizeof (pfp_kstats));

        pfp_ksp = kstat_create("pfpacket", 0, "global", "misc",
            KSTAT_TYPE_NAMED, sizeof (pfp_kstats) / sizeof (kstat_named_t),
            KSTAT_FLAG_VIRTUAL);
        if (pfp_ksp != NULL) {
                pfp_ksp->ks_data = &ks_stats;
                kstat_install(pfp_ksp);
        }

        return (0);
}

/*
 * sockpfp_fini: called when the operating system wants to unload the
 * socket module from the kernel.
 */
static void
sockpfp_fini(void)
{
        if (pfp_ksp != NULL)
                kstat_delete(pfp_ksp);
}

/*
 * Due to sockets being created read-write by default, all PF_PACKET sockets
 * therefore require the NET_RAWACCESS priviliege, even if the socket is only
 * being used for reading packets from.
 *
 * This create function enforces this module only being used with PF_PACKET
 * sockets and the policy that we support via the config file in sock2path.d:
 * PF_PACKET sockets must be either SOCK_DGRAM or SOCK_RAW.
 */
/* ARGSUSED */
static sock_lower_handle_t
sockpfp_create(int family, int type, int proto,
    sock_downcalls_t **sock_downcalls, uint_t *smodep, int *errorp,
    int sflags, cred_t *cred)
{
        struct pfpsock *ps;
        int kmflags;
        int newproto;
        int i;

        if (secpolicy_net_rawaccess(cred) != 0) {
                *errorp = EACCES;
                return (NULL);
        }

        if (family != AF_PACKET) {
                *errorp = EAFNOSUPPORT;
                return (NULL);
        }

        if ((type != SOCK_RAW) && (type != SOCK_DGRAM)) {
                *errorp = ESOCKTNOSUPPORT;
                return (NULL);
        }

        /*
         * First check to see if the protocol number passed in via the socket
         * creation should be mapped to a different number for internal use.
         */
        for (i = 0, newproto = -1;
            i < sizeof (accepted_protos)/ sizeof (accepted_protos[0]); i++) {
                if (accepted_protos[i][0] == proto) {
                        newproto = accepted_protos[i][1];
                        break;
                }
        }

        /*
         * If the mapping of the protocol that was under 0x800 failed to find
         * a local equivalent then fail the socket creation. If the protocol
         * for the socket is over 0x800 and it was not found in the mapping
         * table above, then use the value as is.
         */
        if (newproto == -1) {
                if (proto < 0x800) {
                        *errorp = ENOPROTOOPT;
                        return (NULL);
                }
                newproto = proto;
        }
        proto = newproto;

        kmflags = (sflags & SOCKET_NOSLEEP) ? KM_NOSLEEP : KM_SLEEP;
        ps = kmem_zalloc(sizeof (*ps), kmflags);
        if (ps == NULL) {
                *errorp = ENOMEM;
                return (NULL);
        }

        ps->ps_type = type;
        ps->ps_proto = proto;
        rw_init(&ps->ps_bpflock, NULL, RW_DRIVER, NULL);
        mutex_init(&ps->ps_lock, NULL, MUTEX_DRIVER, NULL);

        *sock_downcalls = &pfp_downcalls;
        /*
         * Setting this causes bytes from a packet that do not fit into the
         * destination user buffer to be discarded. Thus the API is one
         * packet per receive and callers are required to use a buffer large
         * enough for the biggest packet that the interface can provide.
         */
        *smodep = SM_ATOMIC;

        return ((sock_lower_handle_t)ps);
}

/* ************************************************************************* */

/*
 * pfp_packet is the callback function that is given to the mac layer for
 * PF_PACKET to receive packets with. One packet at a time is passed into
 * this function from the mac layer. Each packet is a private copy given
 * to PF_PACKET to modify or free as it wishes and does not harm the original
 * packet from which it was cloned.
 */
/* ARGSUSED */
static void
pfp_packet(void *arg, mac_resource_handle_t mrh, mblk_t *mp, boolean_t flag)
{
        struct T_unitdata_ind *tunit;
        struct sockaddr_ll *sll;
        struct sockaddr_ll *sol;
        mac_header_info_t hdr;
        struct pfpsock *ps;
        size_t tusz;
        mblk_t *mp0;
        int error;

        if (mp == NULL)
                return;

        ps = arg;
        if (ps->ps_flow_ctrld) {
                ps->ps_flow_ctrl_drops++;
                ps->ps_stats.tp_drops++;
                ks_stats.kp_recv_flow_cntrld.value.ui64++;
                freemsg(mp);
                return;
        }

        if (mac_header_info(ps->ps_mh, mp, &hdr) != 0) {
                /*
                 * Can't decode the packet header information so drop it.
                 */
                ps->ps_stats.tp_drops++;
                ks_stats.kp_recv_mac_hdr_fail.value.ui64++;
                freemsg(mp);
                return;
        }

        if (mac_type(ps->ps_mh) == DL_ETHER &&
            hdr.mhi_bindsap == ETHERTYPE_VLAN) {
                struct ether_vlan_header *evhp;
                struct ether_vlan_header evh;

                hdr.mhi_hdrsize = sizeof (struct ether_vlan_header);
                hdr.mhi_istagged = B_TRUE;

                if (MBLKL(mp) >= sizeof (*evhp)) {
                        evhp = (struct ether_vlan_header *)mp->b_rptr;
                } else {
                        int sz = sizeof (*evhp);
                        char *s = (char *)&evh;
                        mblk_t *tmp;
                        int len;

                        for (tmp = mp; sz > 0 && tmp != NULL;
                            tmp = tmp->b_cont) {
                                len = min(sz, MBLKL(tmp));
                                bcopy(tmp->b_rptr, s, len);
                                sz -= len;
                        }
                        evhp = &evh;
                }
                hdr.mhi_tci = ntohs(evhp->ether_tci);
                hdr.mhi_bindsap = ntohs(evhp->ether_type);
        }

        if ((ps->ps_proto != 0) && (ps->ps_proto != hdr.mhi_bindsap)) {
                /*
                 * The packet is not of interest to this socket so
                 * drop it on the floor. Here the SAP is being used
                 * as a very course filter.
                 */
                ps->ps_stats.tp_drops++;
                ks_stats.kp_recv_bad_proto.value.ui64++;
                freemsg(mp);
                return;
        }

        /*
         * This field is not often set, even for ethernet,
         * by mac_header_info, so compute it if it is 0.
         */
        if (hdr.mhi_pktsize == 0)
                hdr.mhi_pktsize = msgdsize(mp);

        /*
         * If a BPF filter is present, pass the raw packet into that.
         * A failed match will result in zero being returned, indicating
         * that this socket is not interested in the packet.
         */
        if (ps->ps_bpf.bf_len != 0) {
                uchar_t *buffer;
                int buflen;

                buflen = MBLKL(mp);
                if (hdr.mhi_pktsize == buflen) {
                        buffer = mp->b_rptr;
                } else {
                        buflen = 0;
                        buffer = (uchar_t *)mp;
                }
                rw_enter(&ps->ps_bpflock, RW_READER);
                if (bpf_filter(ps->ps_bpf.bf_insns, buffer,
                    hdr.mhi_pktsize, buflen) == 0) {
                        rw_exit(&ps->ps_bpflock);
                        ps->ps_stats.tp_drops++;
                        ks_stats.kp_recv_filtered.value.ui64++;
                        freemsg(mp);
                        return;
                }
                rw_exit(&ps->ps_bpflock);
        }

        if (ps->ps_type == SOCK_DGRAM) {
                /*
                 * SOCK_DGRAM socket expect a "layer 3" packet, so advance
                 * past the link layer header.
                 */
                mp->b_rptr += hdr.mhi_hdrsize;
                hdr.mhi_pktsize -= hdr.mhi_hdrsize;
        }

        tusz = sizeof (struct T_unitdata_ind) + sizeof (struct sockaddr_ll);
        if (ps->ps_auxdata) {
                tusz += _TPI_ALIGN_TOPT(sizeof (struct tpacket_auxdata));
                tusz += _TPI_ALIGN_TOPT(sizeof (struct T_opthdr));
        }

        /*
         * It is tempting to think that this could be optimised by having
         * the base mblk_t allocated and hung off the pfpsock structure,
         * except that then another one would need to be allocated for the
         * sockaddr_ll that is included. Even creating a template to copy
         * from is of questionable value, as read-write from one structure
         * to the other is going to be slower than all of the initialisation.
         */
        mp0 = allocb(tusz, BPRI_HI);
        if (mp0 == NULL) {
                ps->ps_stats.tp_drops++;
                ks_stats.kp_recv_alloc_fail.value.ui64++;
                freemsg(mp);
                return;
        }

        (void) memset(mp0->b_rptr, 0, tusz);

        mp0->b_datap->db_type = M_PROTO;
        mp0->b_wptr = mp0->b_rptr + tusz;

        tunit = (struct T_unitdata_ind *)mp0->b_rptr;
        tunit->PRIM_type = T_UNITDATA_IND;
        tunit->SRC_length = sizeof (struct sockaddr);
        tunit->SRC_offset = sizeof (*tunit);

        sol = &ps->ps_sock;
        sll = (struct sockaddr_ll *)(mp0->b_rptr + sizeof (*tunit));
        sll->sll_ifindex = sol->sll_ifindex;
        sll->sll_hatype = (uint16_t)hdr.mhi_origsap;
        sll->sll_halen = sol->sll_halen;
        if (hdr.mhi_saddr != NULL)
                (void) memcpy(sll->sll_addr, hdr.mhi_saddr, sll->sll_halen);

        switch (hdr.mhi_dsttype) {
        case MAC_ADDRTYPE_MULTICAST :
                sll->sll_pkttype = PACKET_MULTICAST;
                break;
        case MAC_ADDRTYPE_BROADCAST :
                sll->sll_pkttype = PACKET_BROADCAST;
                break;
        case MAC_ADDRTYPE_UNICAST :
                if (memcmp(sol->sll_addr, hdr.mhi_daddr, sol->sll_halen) == 0)
                        sll->sll_pkttype = PACKET_HOST;
                else
                        sll->sll_pkttype = PACKET_OTHERHOST;
                break;
        }

        if (ps->ps_auxdata) {
                struct tpacket_auxdata *aux;
                struct T_opthdr *topt;

                tunit->OPT_offset = _TPI_ALIGN_TOPT(tunit->SRC_offset +
                    sizeof (struct sockaddr_ll));
                tunit->OPT_length = _TPI_ALIGN_TOPT(sizeof (struct T_opthdr)) +
                    _TPI_ALIGN_TOPT(sizeof (struct tpacket_auxdata));

                topt = (struct T_opthdr *)(mp0->b_rptr + tunit->OPT_offset);
                aux = (struct tpacket_auxdata *)
                    ((char *)topt + _TPI_ALIGN_TOPT(sizeof (*topt)));

                topt->len = tunit->OPT_length;
                topt->level = SOL_PACKET;
                topt->name = PACKET_AUXDATA;
                topt->status = 0;
                /*
                 * libpcap doesn't seem to use any other field,
                 * so it isn't clear how they should be filled in.
                 */
                aux->tp_vlan_vci = hdr.mhi_tci;
        }

        linkb(mp0, mp);

        (void) gethrestime(&ps->ps_timestamp);

        ps->ps_upcalls->su_recv(ps->ps_upper, mp0, hdr.mhi_pktsize, 0,
            &error, NULL);

        if (error == 0) {
                ps->ps_stats.tp_packets++;
                ks_stats.kp_recv_ok.value.ui64++;
        } else {
                mutex_enter(&ps->ps_lock);
                if (error == ENOSPC) {
                        ps->ps_upcalls->su_recv(ps->ps_upper, NULL, 0, 0,
                            &error, NULL);
                        if (error == ENOSPC)
                                ps->ps_flow_ctrld = B_TRUE;
                }
                mutex_exit(&ps->ps_lock);
                ps->ps_stats.tp_drops++;
                ks_stats.kp_recv_fail.value.ui64++;
        }
}

/*
 * Bind a PF_PACKET socket to a network interface.
 *
 * The default operation of this bind() is to place the socket (and thus the
 * network interface) into promiscuous mode. It is then up to the application
 * to turn that down by issuing the relevant ioctls, if desired.
 */
static int
sdpfp_bind(sock_lower_handle_t handle, struct sockaddr *addr,
    socklen_t addrlen, struct cred *cred)
{
        struct sockaddr_ll *addr_ll, *sol;
        mac_client_handle_t mch;
        struct pfpsock *ps;
        mac_handle_t mh;
        int error;

        ps = (struct pfpsock *)handle;
        if (ps->ps_bound)
                return (EINVAL);

        if (addrlen < sizeof (struct sockaddr_ll) || addr == NULL)
                return (EINVAL);

        addr_ll = (struct sockaddr_ll *)addr;

        error = pfp_open_index(addr_ll->sll_ifindex, &mh, &mch, cred);
        if (error != 0)
                return (error);
        /*
         * Ensure that each socket is only bound once.
         */
        mutex_enter(&ps->ps_lock);
        if (ps->ps_mh != 0) {
                mutex_exit(&ps->ps_lock);
                pfp_close(mh, mch);
                return (EADDRINUSE);
        }
        ps->ps_mh = mh;
        ps->ps_mch = mch;
        mutex_exit(&ps->ps_lock);

        /*
         * Cache all of the information from bind so that it's in an easy
         * place to get at when packets are received.
         */
        sol = &ps->ps_sock;
        sol->sll_family = AF_PACKET;
        sol->sll_ifindex = addr_ll->sll_ifindex;
        sol->sll_protocol = addr_ll->sll_protocol;
        sol->sll_halen = mac_addr_len(ps->ps_mh);
        mac_unicast_primary_get(ps->ps_mh, sol->sll_addr);
        mac_sdu_get(ps->ps_mh, NULL, &ps->ps_max_sdu);
        ps->ps_linkid = addr_ll->sll_ifindex;

        error = mac_promisc_add(ps->ps_mch, MAC_CLIENT_PROMISC_ALL,
            pfp_packet, ps, &ps->ps_phd, MAC_PROMISC_FLAGS_VLAN_TAG_STRIP);
        if (error == 0) {
                ps->ps_promisc = MAC_CLIENT_PROMISC_ALL;
                ps->ps_bound = B_TRUE;
        }

        return (error);
}

/* ARGSUSED */
static void
sdpfp_activate(sock_lower_handle_t lower, sock_upper_handle_t upper,
    sock_upcalls_t *upcalls, int flags, cred_t *cred)
{
        struct pfpsock *ps;

        ps = (struct pfpsock *)lower;
        ps->ps_upper = upper;
        ps->ps_upcalls = upcalls;
}

/*
 * This module only implements getting socket options for the new socket
 * option level (SOL_PACKET) that it introduces. All other requests are
 * passed back to the sockfs layer.
 */
/* ARGSUSED */
static int
sdpfp_getsockopt(sock_lower_handle_t handle, int level, int option_name,
    void *optval, socklen_t *optlenp, struct cred *cred)
{
        struct pfpsock *ps;
        int error = 0;

        ps = (struct pfpsock *)handle;

        switch (level) {
        case SOL_PACKET :
                error = pfp_getpacket_sockopt(handle, option_name, optval,
                    optlenp);
                break;

        case SOL_SOCKET :
                if (option_name == SO_RCVBUF) {
                        if (*optlenp < sizeof (int32_t))
                                return (EINVAL);
                        *((int32_t *)optval) = ps->ps_rcvbuf;
                        *optlenp = sizeof (int32_t);
                } else {
                        error = ENOPROTOOPT;
                }
                break;

        default :
                /*
                 * If sockfs code receives this error in return from the
                 * getsockopt downcall it handles the option locally, if
                 * it can.
                 */
                error = ENOPROTOOPT;
                break;
        }

        return (error);
}

/*
 * PF_PACKET supports setting socket options at only two levels:
 * SOL_SOCKET and SOL_PACKET.
 */
/* ARGSUSED */
static int
sdpfp_setsockopt(sock_lower_handle_t handle, int level, int option_name,
    const void *optval, socklen_t optlen, struct cred *cred)
{
        int error = 0;

        switch (level) {
        case SOL_SOCKET :
                error = pfp_setsocket_sockopt(handle, option_name, optval,
                    optlen);
                break;
        case SOL_PACKET :
                error = pfp_setpacket_sockopt(handle, option_name, optval,
                    optlen);
                break;
        default :
                error = EINVAL;
                break;
        }

        return (error);
}

/*
 * This function is incredibly inefficient for sending any packet that
 * comes with a msghdr asking to be sent to an interface to which the
 * socket has not been bound. Some possibilities here are keeping a
 * cache of all open mac's and mac_client's, for the purpose of sending,
 * and closing them after some amount of inactivity. Clearly, applications
 * should not be written to use one socket for multiple interfaces if
 * performance is desired with the code as is.
 */
/* ARGSUSED */
static int
sdpfp_senduio(sock_lower_handle_t handle, struct uio *uiop,
    struct nmsghdr *msg, struct cred *cred)
{
        struct sockaddr_ll *sol;
        mac_client_handle_t mch;
        struct pfpsock *ps;
        boolean_t new_open;
        mac_handle_t mh;
        size_t mpsize;
        uint_t maxsdu;
        mblk_t *mp0;
        mblk_t *mp;
        int error;

        mp = NULL;
        mp0 = NULL;
        new_open = B_FALSE;
        ps = (struct pfpsock *)handle;
        mh = ps->ps_mh;
        mch = ps->ps_mch;
        maxsdu = ps->ps_max_sdu;

        sol = (struct sockaddr_ll *)msg->msg_name;
        if (sol == NULL) {
                /*
                 * If no sockaddr_ll has been provided with the send call,
                 * use the one constructed when the socket was bound to an
                 * interface and fail if it hasn't been bound.
                 */
                if (!ps->ps_bound) {
                        ks_stats.kp_send_unbound.value.ui64++;
                        return (EPROTO);
                }
                sol = &ps->ps_sock;
        } else {
                /*
                 * Verify the sockaddr_ll message passed down before using
                 * it to send a packet out with. If it refers to an interface
                 * that has not been bound, it is necessary to open it.
                 */
                struct sockaddr_ll *sll;

                if (msg->msg_namelen < sizeof (struct sockaddr_ll)) {
                        ks_stats.kp_send_short_msg.value.ui64++;
                        return (EINVAL);
                }

                if (sol->sll_family != AF_PACKET) {
                        ks_stats.kp_send_wrong_family.value.ui64++;
                        return (EAFNOSUPPORT);
                }

                sll = &ps->ps_sock;
                if (sol->sll_ifindex != sll->sll_ifindex) {
                        error = pfp_open_index(sol->sll_ifindex, &mh, &mch,
                            cred);
                        if (error != 0) {
                                ks_stats.kp_send_open_fail.value.ui64++;
                                return (error);
                        }
                        mac_sdu_get(mh, NULL, &maxsdu);
                        new_open = B_TRUE;
                }
        }

        mpsize = uiop->uio_resid;
        if (mpsize > maxsdu) {
                ks_stats.kp_send_too_big.value.ui64++;
                error = EMSGSIZE;
                goto done;
        }

        if ((mp = allocb(mpsize, BPRI_HI)) == NULL) {
                ks_stats.kp_send_alloc_fail.value.ui64++;
                error = ENOBUFS;
                goto done;
        }

        mp->b_wptr = mp->b_rptr + mpsize;
        error = uiomove(mp->b_rptr, mpsize, UIO_WRITE, uiop);
        if (error != 0) {
                ks_stats.kp_send_uiomove_fail.value.ui64++;
                goto done;
        }

        if (ps->ps_type == SOCK_DGRAM) {
                mp0 = mac_header(mh, sol->sll_addr, sol->sll_protocol, mp, 0);
                if (mp0 == NULL) {
                        ks_stats.kp_send_no_memory.value.ui64++;
                        error = ENOBUFS;
                        goto done;
                }
                linkb(mp0, mp);
                mp = mp0;
        }

        /*
         * As this is sending datagrams and no promise is made about
         * how or if a packet will be sent/delivered, no effort is to
         * be expended in recovering from a situation where the packet
         * cannot be sent - it is just dropped.
         */
        error = mac_tx(mch, mp, 0, MAC_DROP_ON_NO_DESC, NULL);
        if (error == 0) {
                mp = NULL;
                ks_stats.kp_send_ok.value.ui64++;
        } else {
                ks_stats.kp_send_failed.value.ui64++;
        }

done:

        if (new_open) {
                ASSERT(mch != ps->ps_mch);
                ASSERT(mh != ps->ps_mh);
                pfp_close(mh, mch);
        }
        if (mp != NULL)
                freemsg(mp);

        return (error);

}

/*
 * There's no use of a lock here, or at the bottom of pfp_packet() where
 * ps_flow_ctrld is set to true, because in a situation where these two
 * are racing to set the flag one way or the other, the end result is
 * going to be ultimately determined by the scheduler anyway - which of
 * the two threads gets the lock first? In such an operational environment,
 * we've got packets arriving too fast to be delt with so packets are going
 * to be dropped. Grabbing a lock just makes the drop more expensive.
 */
static void
sdpfp_clr_flowctrl(sock_lower_handle_t handle)
{
        struct pfpsock *ps;

        ps = (struct pfpsock *)handle;

        mutex_enter(&ps->ps_lock);
        ps->ps_flow_ctrld = B_FALSE;
        mutex_exit(&ps->ps_lock);
}

/*
 * The implementation of this ioctl() handler is intended to function
 * in the absence of a bind() being made before it is called. Thus the
 * function calls mac_open() itself to provide a handle
 * This function is structured like this:
 * - determine the linkid for the interface being targetted
 * - open the interface with said linkid
 * - perform ioctl
 * - copy results back to caller
 *
 * The ioctls that interact with interface flags have been implented below
 * to assume that the interface is always up and running (IFF_RUNNING) and
 * to use the state of this socket to determine whether or not the network
 * interface is in promiscuous mode. Thus an ioctl to get the interface flags
 * of an interface that has been put in promiscuous mode by another socket
 * (in the same program or different), will not report that status.
 */
/* ARGSUSED */
static int
sdpfp_ioctl(sock_lower_handle_t handle, int cmd, intptr_t arg, int mod,
    int32_t *rval, struct cred *cr)
{
        struct timeval tival;
        mac_client_promisc_type_t mtype;
        struct sockaddr_dl *sock;
        datalink_id_t linkid;
        struct lifreq lifreq;
        struct ifreq ifreq;
        struct pfpsock *ps;
        mac_handle_t mh;
        int error;

        ps = (struct pfpsock *)handle;

        switch (cmd) {
        /*
         * ioctls that work on "struct lifreq"
         */
        case SIOCSLIFFLAGS :
        case SIOCGLIFINDEX :
        case SIOCGLIFFLAGS :
        case SIOCGLIFMTU :
        case SIOCGLIFHWADDR :
                error = pfp_lifreq_getlinkid(arg, &lifreq, &linkid, mod);
                if (error != 0)
                        return (error);
                break;

        /*
         * ioctls that work on "struct ifreq".
         * Not all of these have a "struct lifreq" partner, for example
         * SIOCGIFHWADDR, for the simple reason that the logical interface
         * does not have a hardware address.
         */
        case SIOCSIFFLAGS :
        case SIOCGIFINDEX :
        case SIOCGIFFLAGS :
        case SIOCGIFMTU :
        case SIOCGIFHWADDR :
                error = pfp_ifreq_getlinkid(arg, &ifreq, &linkid, mod);
                if (error != 0)
                        return (error);
                break;

        case SIOCGSTAMP :
                tival.tv_sec = (time_t)ps->ps_timestamp.tv_sec;
                tival.tv_usec = ps->ps_timestamp.tv_nsec / 1000;
                if (get_udatamodel() == DATAMODEL_NATIVE) {
                        error = ddi_copyout(&tival, (void *)arg,
                            sizeof (tival), mod);
                }
#ifdef _SYSCALL32_IMPL
                else {
                        struct timeval32 tv32;
                        TIMEVAL_TO_TIMEVAL32(&tv32, &tival);
                        error = ddi_copyout(&tv32, (void *)arg,
                            sizeof (tv32), mod);
                }
#endif
                return (error);
        }

        error =  mac_open_by_linkid(linkid, &mh);
        if (error != 0)
                return (error);

        switch (cmd) {
        case SIOCGLIFINDEX :
                lifreq.lifr_index = linkid;
                break;

        case SIOCGIFINDEX :
                ifreq.ifr_index = linkid;
                break;

        case SIOCGIFFLAGS :
                ifreq.ifr_flags = IFF_RUNNING;
                if (ps->ps_promisc == MAC_CLIENT_PROMISC_ALL)
                        ifreq.ifr_flags |= IFF_PROMISC;
                break;

        case SIOCGLIFFLAGS :
                lifreq.lifr_flags = IFF_RUNNING;
                if (ps->ps_promisc == MAC_CLIENT_PROMISC_ALL)
                        lifreq.lifr_flags |= IFF_PROMISC;
                break;

        case SIOCSIFFLAGS :
                if (linkid != ps->ps_linkid) {
                        error = EINVAL;
                } else {
                        if ((ifreq.ifr_flags & IFF_PROMISC) != 0)
                                mtype = MAC_CLIENT_PROMISC_ALL;
                        else
                                mtype = MAC_CLIENT_PROMISC_FILTERED;
                        error = pfp_set_promisc(ps, mtype);
                }
                break;

        case SIOCSLIFFLAGS :
                if (linkid != ps->ps_linkid) {
                        error = EINVAL;
                } else {
                        if ((lifreq.lifr_flags & IFF_PROMISC) != 0)
                                mtype = MAC_CLIENT_PROMISC_ALL;
                        else
                                mtype = MAC_CLIENT_PROMISC_FILTERED;
                        error = pfp_set_promisc(ps, mtype);
                }
                break;

        case SIOCGIFMTU :
                mac_sdu_get(mh, NULL, &ifreq.ifr_mtu);
                break;

        case SIOCGLIFMTU :
                mac_sdu_get(mh, NULL, &lifreq.lifr_mtu);
                break;

        case SIOCGIFHWADDR :
                if (mac_addr_len(mh) > sizeof (ifreq.ifr_addr.sa_data)) {
                        error = EPFNOSUPPORT;
                        break;
                }

                if (mac_addr_len(mh) == 0) {
                        (void) memset(ifreq.ifr_addr.sa_data, 0,
                            sizeof (ifreq.ifr_addr.sa_data));
                } else {
                        mac_unicast_primary_get(mh,
                            (uint8_t *)ifreq.ifr_addr.sa_data);
                }

                /*
                 * The behaviour here in setting sa_family is consistent
                 * with what applications such as tcpdump would expect
                 * for a Linux PF_PACKET socket.
                 */
                ifreq.ifr_addr.sa_family = pfp_dl_to_arphrd(mac_type(mh));
                break;

        case SIOCGLIFHWADDR :
                lifreq.lifr_type = 0;
                sock = (struct sockaddr_dl *)&lifreq.lifr_addr;

                if (mac_addr_len(mh) > sizeof (sock->sdl_data)) {
                        error = EPFNOSUPPORT;
                        break;
                }

                /*
                 * Fill in the sockaddr_dl with link layer details. Of note,
                 * the index is returned as 0 for a couple of reasons:
                 * (1) there is no public API that uses or requires it
                 * (2) the MAC index is currently 32bits and sdl_index is 16.
                 */
                sock->sdl_family = AF_LINK;
                sock->sdl_index = 0;
                sock->sdl_type = mac_type(mh);
                sock->sdl_nlen = 0;
                sock->sdl_alen = mac_addr_len(mh);
                sock->sdl_slen = 0;
                if (mac_addr_len(mh) == 0) {
                        (void) memset(sock->sdl_data, 0,
                            sizeof (sock->sdl_data));
                } else {
                        mac_unicast_primary_get(mh, (uint8_t *)sock->sdl_data);
                }
                break;

        default :
                break;
        }

        mac_close(mh);

        if (error == 0) {
                /*
                 * Only the "GET" ioctls need to copy data back to userace.
                 */
                switch (cmd) {
                case SIOCGLIFINDEX :
                case SIOCGLIFFLAGS :
                case SIOCGLIFMTU :
                case SIOCGLIFHWADDR :
                        error = ddi_copyout(&lifreq, (void *)arg,
                            sizeof (lifreq), mod);
                        break;

                case SIOCGIFINDEX :
                case SIOCGIFFLAGS :
                case SIOCGIFMTU :
                case SIOCGIFHWADDR :
                        error = ddi_copyout(&ifreq, (void *)arg,
                            sizeof (ifreq), mod);
                        break;
                default :
                        break;
                }
        }

        return (error);
}

/*
 * Closing the socket requires that all open references to network
 * interfaces be closed.
 */
/* ARGSUSED */
static int
sdpfp_close(sock_lower_handle_t handle, int flag, struct cred *cr)
{
        struct pfpsock *ps = (struct pfpsock *)handle;

        if (ps->ps_phd != 0) {
                mac_promisc_remove(ps->ps_phd);
                ps->ps_phd = 0;
        }

        if (ps->ps_mch != 0) {
                mac_client_close(ps->ps_mch, 0);
                ps->ps_mch = 0;
        }

        if (ps->ps_mh != 0) {
                mac_close(ps->ps_mh);
                ps->ps_mh = 0;
        }

        kmem_free(ps, sizeof (*ps));

        return (0);
}

/* ************************************************************************* */

/*
 * Given a pointer (arg) to a "struct ifreq" (potentially in user space),
 * determine the linkid for the interface name stored in that structure.
 * name is used as a buffer so that we can ensure a trailing \0 is appended
 * to the name safely.
 */
static int
pfp_ifreq_getlinkid(intptr_t arg, struct ifreq *ifreqp,
    datalink_id_t *linkidp, int mode)
{
        char name[IFNAMSIZ + 1];
        int error;

        if (ddi_copyin((void *)arg, ifreqp, sizeof (*ifreqp), mode) != 0)
                return (EFAULT);

        (void) strlcpy(name, ifreqp->ifr_name, sizeof (name));

        error = dls_mgmt_get_linkid(name, linkidp);
        if (error != 0)
                error = dls_devnet_macname2linkid(name, linkidp);

        return (error);
}

/*
 * Given a pointer (arg) to a "struct lifreq" (potentially in user space),
 * determine the linkid for the interface name stored in that structure.
 * name is used as a buffer so that we can ensure a trailing \0 is appended
 * to the name safely.
 */
static int
pfp_lifreq_getlinkid(intptr_t arg, struct lifreq *lifreqp,
    datalink_id_t *linkidp, int mode)
{
        char name[LIFNAMSIZ + 1];
        int error;

        if (ddi_copyin((void *)arg, lifreqp, sizeof (*lifreqp), mode) != 0)
                return (EFAULT);

        (void) strlcpy(name, lifreqp->lifr_name, sizeof (name));

        error = dls_mgmt_get_linkid(name, linkidp);
        if (error != 0)
                error = dls_devnet_macname2linkid(name, linkidp);

        return (error);
}

/*
 * Although there are several new SOL_PACKET options that can be set and
 * are specific to this implementation of PF_PACKET, the current API does
 * not support doing a get on them to retrieve accompanying status. Thus
 * it is only currently possible to use SOL_PACKET with getsockopt to
 * retrieve statistical information. This remains consistant with the
 * Linux API at the time of writing.
 */
static int
pfp_getpacket_sockopt(sock_lower_handle_t handle, int option_name,
    void *optval, socklen_t *optlenp)
{
        struct pfpsock *ps;
        struct tpacket_stats_short tpss;
        int error = 0;

        ps = (struct pfpsock *)handle;

        switch (option_name) {
        case PACKET_STATISTICS :
                if (*optlenp < sizeof (ps->ps_stats)) {
                        error = EINVAL;
                        break;
                }
                *optlenp = sizeof (ps->ps_stats);
                bcopy(&ps->ps_stats, optval, sizeof (ps->ps_stats));
                break;
        case PACKET_STATISTICS_SHORT :
                if (*optlenp < sizeof (tpss)) {
                        error = EINVAL;
                        break;
                }
                *optlenp = sizeof (tpss);
                tpss.tp_packets = ps->ps_stats.tp_packets;
                tpss.tp_drops = ps->ps_stats.tp_drops;
                bcopy(&tpss, optval, sizeof (tpss));
                break;
        default :
                error = EINVAL;
                break;
        }

        return (error);
}

/*
 * The SOL_PACKET level for socket options supports three options,
 * PACKET_ADD_MEMBERSHIP, PACKET_DROP_MEMBERSHIP and PACKET_AUXDATA.
 * This function is responsible for mapping the two socket options
 * that manage multicast membership into the appropriate internal
 * function calls to bring the option into effect. Whilst direct
 * changes to the multicast membership (ADD/DROP) groups is handled
 * by calls directly into the mac module, changes to the promiscuos
 * mode are vectored through pfp_set_promisc() so that the logic for
 * managing the promiscuous mode is in one place.
 */
/* ARGSUSED */
static int
pfp_setpacket_sockopt(sock_lower_handle_t handle, int option_name,
    const void *optval, socklen_t optlen)
{
        struct packet_mreq mreq;
        struct pfpsock *ps;
        int error = 0;
        int opt;

        ps = (struct pfpsock *)handle;
        if (!ps->ps_bound)
                return (EPROTO);

        if ((option_name == PACKET_ADD_MEMBERSHIP) ||
            (option_name == PACKET_DROP_MEMBERSHIP)) {
                if (!ps->ps_bound)
                        return (EPROTO);
                bcopy(optval, &mreq, sizeof (mreq));
                if (ps->ps_linkid != mreq.mr_ifindex)
                        return (EINVAL);
        }

        switch (option_name) {
        case PACKET_ADD_MEMBERSHIP :
                switch (mreq.mr_type) {
                case PACKET_MR_MULTICAST :
                        if (mreq.mr_alen != ps->ps_sock.sll_halen)
                                return (EINVAL);

                        error = mac_multicast_add(ps->ps_mch, mreq.mr_address);
                        break;

                case PACKET_MR_PROMISC :
                        error = pfp_set_promisc(ps, MAC_CLIENT_PROMISC_ALL);
                        break;

                case PACKET_MR_ALLMULTI :
                        error = pfp_set_promisc(ps, MAC_CLIENT_PROMISC_MULTI);
                        break;
                }
                break;

        case PACKET_DROP_MEMBERSHIP :
                switch (mreq.mr_type) {
                case PACKET_MR_MULTICAST :
                        if (mreq.mr_alen != ps->ps_sock.sll_halen)
                                return (EINVAL);

                        mac_multicast_remove(ps->ps_mch, mreq.mr_address);
                        break;

                case PACKET_MR_PROMISC :
                        if (ps->ps_promisc != MAC_CLIENT_PROMISC_ALL)
                                return (EINVAL);
                        error = pfp_set_promisc(ps,
                            MAC_CLIENT_PROMISC_FILTERED);
                        break;

                case PACKET_MR_ALLMULTI :
                        if (ps->ps_promisc != MAC_CLIENT_PROMISC_MULTI)
                                return (EINVAL);
                        error = pfp_set_promisc(ps,
                            MAC_CLIENT_PROMISC_FILTERED);
                        break;
                }
                break;

        case PACKET_AUXDATA :
                if (optlen == sizeof (int)) {
                        opt = *(int *)optval;
                        ps->ps_auxdata = (opt != 0);
                } else {
                        error = EINVAL;
                }
                break;
        default :
                error = EINVAL;
                break;
        }

        return (error);
}

/*
 * There are only two special setsockopt's for SOL_SOCKET with PF_PACKET:
 * SO_ATTACH_FILTER and SO_DETACH_FILTER.
 *
 * Both of these setsockopt values are candidates for being handled by the
 * socket layer itself in future, however this requires understanding how
 * they would interact with all other sockets.
 */
static int
pfp_setsocket_sockopt(sock_lower_handle_t handle, int option_name,
    const void *optval, socklen_t optlen)
{
        struct bpf_program prog;
        struct bpf_insn *fcode;
        struct pfpsock *ps;
        struct sock_proto_props sopp;
        int error = 0;
        int size;

        ps = (struct pfpsock *)handle;

        switch (option_name) {
        case SO_ATTACH_FILTER :
#ifdef _LP64
                if (optlen == sizeof (struct bpf_program32)) {
                        struct bpf_program32 prog32;

                        bcopy(optval, &prog32, sizeof (prog32));
                        prog.bf_len = prog32.bf_len;
                        prog.bf_insns = (void *)(uint64_t)prog32.bf_insns;
                } else
#endif
                if (optlen == sizeof (struct bpf_program)) {
                        bcopy(optval, &prog, sizeof (prog));
                } else if (optlen != sizeof (struct bpf_program)) {
                        return (EINVAL);
                }
                if (prog.bf_len > BPF_MAXINSNS)
                        return (EINVAL);

                size = prog.bf_len * sizeof (*prog.bf_insns);
                fcode = kmem_alloc(size, KM_SLEEP);
                if (ddi_copyin(prog.bf_insns, fcode, size, 0) != 0) {
                        kmem_free(fcode, size);
                        return (EFAULT);
                }

                if (bpf_validate(fcode, (int)prog.bf_len)) {
                        rw_enter(&ps->ps_bpflock, RW_WRITER);
                        pfp_release_bpf(ps);
                        ps->ps_bpf.bf_insns = fcode;
                        ps->ps_bpf.bf_len = size;
                        rw_exit(&ps->ps_bpflock);

                        return (0);
                }
                kmem_free(fcode, size);
                error = EINVAL;
                break;

        case SO_DETACH_FILTER :
                pfp_release_bpf(ps);
                break;

        case SO_RCVBUF :
                size = *(int32_t *)optval;
                if (size > sockmod_pfp_rcvbuf_max || size < 0)
                        return (ENOBUFS);
                sopp.sopp_flags = SOCKOPT_RCVHIWAT;
                sopp.sopp_rxhiwat = size;
                ps->ps_upcalls->su_set_proto_props(ps->ps_upper, &sopp);
                ps->ps_rcvbuf = size;
                break;

        default :
                error = ENOPROTOOPT;
                break;
        }

        return (error);
}

/*
 * pfp_open_index is an internal function used to open a MAC device by
 * its index. Both a mac_handle_t and mac_client_handle_t are acquired
 * because some of the interfaces provided by the mac layer require either
 * only the mac_handle_t or both it and mac_handle_t.
 *
 * Whilst inside the kernel we can access data structures supporting any
 * zone, access to interfaces from non-global zones is restricted to those
 * interfaces (if any) that are exclusively assigned to a zone.
 */
static int
pfp_open_index(int index, mac_handle_t *mhp, mac_client_handle_t *mcip,
    cred_t *cred)
{
        mac_client_handle_t mch;
        zoneid_t ifzoneid;
        mac_handle_t mh;
        zoneid_t zoneid;
        int error;

        mh = 0;
        mch = 0;
        error = mac_open_by_linkid(index, &mh);
        if (error != 0)
                goto bad_open;

        error = mac_client_open(mh, &mch, NULL,
            MAC_OPEN_FLAGS_USE_DATALINK_NAME);
        if (error != 0)
                goto bad_open;

        zoneid = crgetzoneid(cred);
        if (zoneid != GLOBAL_ZONEID) {
                mac_perim_handle_t perim;

                mac_perim_enter_by_mh(mh, &perim);
                error = dls_link_getzid(mac_name(mh), &ifzoneid);
                mac_perim_exit(perim);
                if (error != 0)
                        goto bad_open;
                if (ifzoneid != zoneid) {
                        error = EACCES;
                        goto bad_open;
                }
        }

        *mcip = mch;
        *mhp = mh;

        return (0);
bad_open:
        if (mch != 0)
                mac_client_close(mch, 0);
        if (mh != 0)
                mac_close(mh);
        return (error);
}

static void
pfp_close(mac_handle_t mh, mac_client_handle_t mch)
{
        mac_client_close(mch, 0);
        mac_close(mh);
}

/*
 * The purpose of this function is to provide a single place where we free
 * the loaded BPF program and reset all pointers/counters associated with
 * it.
 */
static void
pfp_release_bpf(struct pfpsock *ps)
{
        if (ps->ps_bpf.bf_len != 0) {
                kmem_free(ps->ps_bpf.bf_insns, ps->ps_bpf.bf_len);
                ps->ps_bpf.bf_len = 0;
                ps->ps_bpf.bf_insns = NULL;
        }
}

/*
 * Set the promiscuous mode of a network interface.
 * This function only calls the mac layer when there is a change to the
 * status of a network interface's promiscous mode. Tracking of how many
 * sockets have the network interface in promiscuous mode, and thus the
 * control over the physical device's status, is left to the mac layer.
 */
static int
pfp_set_promisc(struct pfpsock *ps, mac_client_promisc_type_t turnon)
{
        int error = 0;
        int flags;

        /*
         * There are 4 combinations of turnon/ps_promisc.
         * This if handles 2 (both false, both true) and the if() below
         * handles the remaining one - when change is required.
         */
        if (turnon == ps->ps_promisc)
                return (error);

        if (ps->ps_phd != 0) {
                mac_promisc_remove(ps->ps_phd);
                ps->ps_phd = 0;

                /*
                 * ps_promisc is set here in case the call to mac_promisc_add
                 * fails: leaving it to indicate that the interface is still
                 * in some sort of promiscuous mode is false.
                 */
                if (ps->ps_promisc != MAC_CLIENT_PROMISC_FILTERED) {
                        ps->ps_promisc = MAC_CLIENT_PROMISC_FILTERED;
                        flags = MAC_PROMISC_FLAGS_NO_PHYS;
                } else {
                        flags = 0;
                }
                flags |= MAC_PROMISC_FLAGS_VLAN_TAG_STRIP;
        }

        error = mac_promisc_add(ps->ps_mch, turnon, pfp_packet, ps,
            &ps->ps_phd, flags);
        if (error == 0)
                ps->ps_promisc = turnon;

        return (error);
}

/*
 * This table maps the MAC types in Solaris to the ARPHRD_* values used
 * on Linux. This is used with the SIOCGIFHWADDR/SIOCGLIFHWADDR ioctl.
 *
 * The symbols in this table are *not* pulled in from <net/if_arp.h>,
 * they are pulled from <netpacket/packet.h>, thus it acts as a source
 * of supplementary information to the ARP table.
 */
static uint_t arphrd_to_dl[][2] = {
        { ARPHRD_IEEE80211,     DL_WIFI },
        { ARPHRD_TUNNEL,        DL_IPV4 },
        { ARPHRD_TUNNEL,        DL_IPV6 },
        { ARPHRD_TUNNEL,        DL_6TO4 },
        { ARPHRD_AX25,          DL_X25 },
        { ARPHRD_ATM,           DL_ATM },
        { 0,                    0 }
};

static int
pfp_dl_to_arphrd(int dltype)
{
        int i;

        for (i = 0; arphrd_to_dl[i][0] != 0; i++)
                if (arphrd_to_dl[i][1] == dltype)
                        return (arphrd_to_dl[i][0]);
        return (arp_hw_type(dltype));
}