/*      $NetBSD: altq_priq.c,v 1.30 2026/01/11 16:31:27 christos Exp $  */
/*      $KAME: altq_priq.c,v 1.13 2005/04/13 03:44:25 suz Exp $ */
/*
 * Copyright (C) 2000-2003
 *      Sony Computer Science Laboratories Inc.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY SONY CSL 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 SONY CSL 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.
 */

/*
 * priority queue
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: altq_priq.c,v 1.30 2026/01/11 16:31:27 christos Exp $");

#ifdef _KERNEL_OPT
#include "opt_altq.h"
#include "opt_inet.h"
#include "pf.h"
#endif

#ifdef ALTQ_PRIQ  /* priq is enabled by ALTQ_PRIQ option in opt_altq.h */

#include <sys/param.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/queue.h>
#include <sys/kauth.h>

#include <net/if.h>
#include <netinet/in.h>

#if NPF > 0
#include <net/pfvar.h>
#endif
#include <altq/altq.h>
#include <altq/altq_conf.h>
#include <altq/altq_priq.h>

/*
 * function prototypes
 */
#ifdef ALTQ3_COMPAT
static struct priq_if *priq_attach(struct ifaltq *, u_int);
static void priq_detach(struct priq_if *);
#endif
static int priq_clear_interface(struct priq_if *);
static int priq_request(struct ifaltq *, int, void *);
static void priq_purge(struct priq_if *);
static struct priq_class *priq_class_create(struct priq_if *, int, int, int,
    int);
static int priq_class_destroy(struct priq_class *);
static int priq_enqueue(struct ifaltq *, struct mbuf *);
static struct mbuf *priq_dequeue(struct ifaltq *, int);

static int priq_addq(struct priq_class *, struct mbuf *);
static struct mbuf *priq_getq(struct priq_class *);
static struct mbuf *priq_pollq(struct priq_class *);
static void priq_purgeq(struct priq_class *);

#ifdef ALTQ3_COMPAT
static int priqcmd_if_attach(struct priq_interface *);
static int priqcmd_if_detach(struct priq_interface *);
static int priqcmd_add_class(struct priq_add_class *);
static int priqcmd_delete_class(struct priq_delete_class *);
static int priqcmd_modify_class(struct priq_modify_class *);
static int priqcmd_add_filter(struct priq_add_filter *);
static int priqcmd_delete_filter(struct priq_delete_filter *);
static int priqcmd_class_stats(struct priq_class_stats *);
#endif /* ALTQ3_COMPAT */

static void get_class_stats(struct priq_classstats *, struct priq_class *);
static struct priq_class *clh_to_clp(struct priq_if *, u_int32_t);

#ifdef ALTQ3_COMPAT
altqdev_decl(priq);

/* pif_list keeps all priq_if's allocated. */
static struct priq_if *pif_list = NULL;
#endif /* ALTQ3_COMPAT */

#if NPF > 0
int
priq_pfattach(struct pf_altq *a)
{
        struct ifnet *ifp;
        int s, error;

        if ((ifp = ifunit(a->ifname)) == NULL || a->altq_disc == NULL)
                return EINVAL;
        s = splnet();
        error = altq_attach(&ifp->if_snd, ALTQT_PRIQ, a->altq_disc,
            priq_enqueue, priq_dequeue, priq_request, NULL, NULL);
        splx(s);
        return error;
}

int
priq_add_altq(struct pf_altq *a)
{
        struct priq_if  *pif;
        struct ifnet    *ifp;

        if ((ifp = ifunit(a->ifname)) == NULL)
                return EINVAL;
        if (!ALTQ_IS_READY(&ifp->if_snd))
                return ENODEV;

        pif = malloc(sizeof(struct priq_if), M_DEVBUF, M_WAITOK|M_ZERO);
        if (pif == NULL)
                return ENOMEM;
        pif->pif_bandwidth = a->ifbandwidth;
        pif->pif_maxpri = -1;
        pif->pif_ifq = &ifp->if_snd;

        /* keep the state in pf_altq */
        a->altq_disc = pif;

        return 0;
}

int
priq_remove_altq(struct pf_altq *a)
{
        struct priq_if *pif;

        if ((pif = a->altq_disc) == NULL)
                return EINVAL;
        a->altq_disc = NULL;

        (void)priq_clear_interface(pif);

        free(pif, M_DEVBUF);
        return 0;
}

int
priq_add_queue(struct pf_altq *a)
{
        struct priq_if *pif;
        struct priq_class *cl;

        if ((pif = a->altq_disc) == NULL)
                return EINVAL;

        /* check parameters */
        if (a->priority >= PRIQ_MAXPRI)
                return EINVAL;
        if (a->qid == 0)
                return EINVAL;
        if (pif->pif_classes[a->priority] != NULL)
                return EBUSY;
        if (clh_to_clp(pif, a->qid) != NULL)
                return EBUSY;

        cl = priq_class_create(pif, a->priority, a->qlimit,
            a->pq_u.priq_opts.flags, a->qid);
        if (cl == NULL)
                return ENOMEM;

        return 0;
}

int
priq_remove_queue(struct pf_altq *a)
{
        struct priq_if *pif;
        struct priq_class *cl;

        if ((pif = a->altq_disc) == NULL)
                return EINVAL;

        if ((cl = clh_to_clp(pif, a->qid)) == NULL)
                return EINVAL;

        return priq_class_destroy(cl);
}

int
priq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes)
{
        struct priq_if *pif;
        struct priq_class *cl;
        struct priq_classstats stats;
        int error = 0;

        if ((pif = altq_lookup(a->ifname, ALTQT_PRIQ)) == NULL)
                return EBADF;

        if ((cl = clh_to_clp(pif, a->qid)) == NULL)
                return EINVAL;

        if (*nbytes < sizeof(stats))
                return EINVAL;

        memset(&stats, 0, sizeof(stats));
        get_class_stats(&stats, cl);

        if ((error = copyout((void *)&stats, ubuf, sizeof(stats))) != 0)
                return error;
        *nbytes = sizeof(stats);
        return 0;
}
#endif /* NPF > 0 */

/*
 * bring the interface back to the initial state by discarding
 * all the filters and classes.
 */
static int
priq_clear_interface(struct priq_if *pif)
{
        struct priq_class       *cl;
        int pri;

#ifdef ALTQ3_CLFIER_COMPAT
        /* free the filters for this interface */
        acc_discard_filters(&pif->pif_classifier, NULL, 1);
#endif

        /* clear out the classes */
        for (pri = 0; pri <= pif->pif_maxpri; pri++)
                if ((cl = pif->pif_classes[pri]) != NULL)
                        priq_class_destroy(cl);

        return 0;
}

static int
priq_request(struct ifaltq *ifq, int req, void *arg)
{
        struct priq_if  *pif = (struct priq_if *)ifq->altq_disc;

        switch (req) {
        case ALTRQ_PURGE:
                priq_purge(pif);
                break;
        }
        return 0;
}

/* discard all the queued packets on the interface */
static void
priq_purge(struct priq_if *pif)
{
        struct priq_class *cl;
        int pri;

        for (pri = 0; pri <= pif->pif_maxpri; pri++) {
                if ((cl = pif->pif_classes[pri]) != NULL && !qempty(cl->cl_q))
                        priq_purgeq(cl);
        }
        if (ALTQ_IS_ENABLED(pif->pif_ifq))
                pif->pif_ifq->ifq_len = 0;
}

static struct priq_class *
priq_class_create(struct priq_if *pif, int pri, int qlimit, int flags, int qid)
{
        struct priq_class *cl;
        int s;

#ifndef ALTQ_RED
        if (flags & PRCF_RED) {
#ifdef ALTQ_DEBUG
                printf("priq_class_create: RED not configured for PRIQ!\n");
#endif
                return NULL;
        }
#endif

        if ((cl = pif->pif_classes[pri]) != NULL) {
                /* modify the class instead of creating a new one */
                s = splnet();
                if (!qempty(cl->cl_q))
                        priq_purgeq(cl);
                splx(s);
#ifdef ALTQ_RIO
                if (q_is_rio(cl->cl_q))
                        rio_destroy((rio_t *)cl->cl_red);
#endif
#ifdef ALTQ_RED
                if (q_is_red(cl->cl_q))
                        red_destroy(cl->cl_red);
#endif
        } else {
                cl = malloc(sizeof(struct priq_class), M_DEVBUF,
                    M_WAITOK|M_ZERO);
                if (cl == NULL)
                        return NULL;

                cl->cl_q = malloc(sizeof(class_queue_t), M_DEVBUF,
                    M_WAITOK|M_ZERO);
                if (cl->cl_q == NULL) {
                        free(cl, M_DEVBUF);
                        return NULL;
                }
        }

        pif->pif_classes[pri] = cl;
        if (flags & PRCF_DEFAULTCLASS)
                pif->pif_default = cl;
        if (qlimit == 0)
                qlimit = 50;  /* use default */
        qlimit(cl->cl_q) = qlimit;
        qtype(cl->cl_q) = Q_DROPTAIL;
        qlen(cl->cl_q) = 0;
        cl->cl_flags = flags;
        cl->cl_pri = pri;
        if (pri > pif->pif_maxpri)
                pif->pif_maxpri = pri;
        cl->cl_pif = pif;
        cl->cl_handle = qid;

#ifdef ALTQ_RED
        if (flags & (PRCF_RED|PRCF_RIO)) {
                int red_flags, red_pkttime;

                red_flags = 0;
                if (flags & PRCF_ECN)
                        red_flags |= REDF_ECN;
#ifdef ALTQ_RIO
                if (flags & PRCF_CLEARDSCP)
                        red_flags |= RIOF_CLEARDSCP;
#endif
                if (pif->pif_bandwidth < 8)
                        red_pkttime = 1000 * 1000 * 1000; /* 1 sec */
                else
                        red_pkttime = (int64_t)pif->pif_ifq->altq_ifp->if_mtu
                          * 1000 * 1000 * 1000 / (pif->pif_bandwidth / 8);
#ifdef ALTQ_RIO
                if (flags & PRCF_RIO) {
                        cl->cl_red = (red_t *)rio_alloc(0, NULL,
                                                red_flags, red_pkttime);
                        if (cl->cl_red != NULL)
                                qtype(cl->cl_q) = Q_RIO;
                } else
#endif
                if (flags & PRCF_RED) {
                        cl->cl_red = red_alloc(0, 0,
                            qlimit(cl->cl_q) * 10/100,
                            qlimit(cl->cl_q) * 30/100,
                            red_flags, red_pkttime);
                        if (cl->cl_red != NULL)
                                qtype(cl->cl_q) = Q_RED;
                }
        }
#endif /* ALTQ_RED */

        return cl;
}

static int
priq_class_destroy(struct priq_class *cl)
{
        struct priq_if *pif;
        int s, pri;

        s = splnet();

#ifdef ALTQ3_CLFIER_COMPAT
        /* delete filters referencing to this class */
        acc_discard_filters(&cl->cl_pif->pif_classifier, cl, 0);
#endif

        if (!qempty(cl->cl_q))
                priq_purgeq(cl);

        pif = cl->cl_pif;
        pif->pif_classes[cl->cl_pri] = NULL;
        if (pif->pif_maxpri == cl->cl_pri) {
                for (pri = cl->cl_pri; pri >= 0; pri--)
                        if (pif->pif_classes[pri] != NULL) {
                                pif->pif_maxpri = pri;
                                break;
                        }
                if (pri < 0)
                        pif->pif_maxpri = -1;
        }
        splx(s);

        if (cl->cl_red != NULL) {
#ifdef ALTQ_RIO
                if (q_is_rio(cl->cl_q))
                        rio_destroy((rio_t *)cl->cl_red);
#endif
#ifdef ALTQ_RED
                if (q_is_red(cl->cl_q))
                        red_destroy(cl->cl_red);
#endif
        }
        free(cl->cl_q, M_DEVBUF);
        free(cl, M_DEVBUF);
        return 0;
}

/*
 * priq_enqueue is an enqueue function to be registered to
 * (*altq_enqueue) in struct ifaltq.
 */
static int
priq_enqueue(struct ifaltq *ifq, struct mbuf *m)
{
        struct altq_pktattr pktattr;
        struct priq_if  *pif = (struct priq_if *)ifq->altq_disc;
        struct priq_class *cl;
        struct m_tag *t;
        int len;

        /* grab class set by classifier */
        if ((m->m_flags & M_PKTHDR) == 0) {
                /* should not happen */
                printf("altq: packet for %s does not have pkthdr\n",
                    ifq->altq_ifp->if_xname);
                m_freem(m);
                return ENOBUFS;
        }
        cl = NULL;
        if ((t = m_tag_find(m, PACKET_TAG_ALTQ_QID)) != NULL)
                cl = clh_to_clp(pif, ((struct altq_tag *)(t+1))->qid);
#ifdef ALTQ3_COMPAT
        else if (ifq->altq_flags & ALTQF_CLASSIFY)
                cl = m->m_pkthdr.pattr_class;
#endif
        if (cl == NULL) {
                cl = pif->pif_default;
                if (cl == NULL) {
                        m_freem(m);
                        return ENOBUFS;
                }
        }
#ifdef ALTQ3_COMPAT
        if (m->m_pkthdr.pattr_af != AF_UNSPEC) {
                pktattr.pattr_class = m->m_pkthdr.pattr_class;
                pktattr.pattr_af = m->m_pkthdr.pattr_af;
                pktattr.pattr_hdr = m->m_pkthdr.pattr_hdr;

                cl->cl_pktattr = &pktattr;  /* save proto hdr used by ECN */
        } else
#endif
                cl->cl_pktattr = NULL;
        len = m_pktlen(m);
        if (priq_addq(cl, m) != 0) {
                /* drop occurred.  mbuf was freed in priq_addq. */
                PKTCNTR_ADD(&cl->cl_dropcnt, len);
                return ENOBUFS;
        }
        IFQ_INC_LEN(ifq);

        /* successfully queued. */
        return 0;
}

/*
 * priq_dequeue is a dequeue function to be registered to
 * (*altq_dequeue) in struct ifaltq.
 *
 * note: ALTDQ_POLL returns the next packet without removing the packet
 *      from the queue.  ALTDQ_REMOVE is a normal dequeue operation.
 *      ALTDQ_REMOVE must return the same packet if called immediately
 *      after ALTDQ_POLL.
 */
static struct mbuf *
priq_dequeue(struct ifaltq *ifq, int op)
{
        struct priq_if  *pif = (struct priq_if *)ifq->altq_disc;
        struct priq_class *cl;
        struct mbuf *m;
        int pri;

        if (IFQ_IS_EMPTY(ifq))
                /* no packet in the queue */
                return NULL;

        for (pri = pif->pif_maxpri;  pri >= 0; pri--) {
                if ((cl = pif->pif_classes[pri]) != NULL &&
                    !qempty(cl->cl_q)) {
                        if (op == ALTDQ_POLL)
                                return priq_pollq(cl);

                        m = priq_getq(cl);
                        if (m != NULL) {
                                IFQ_DEC_LEN(ifq);
                                if (qempty(cl->cl_q))
                                        cl->cl_period++;
                                PKTCNTR_ADD(&cl->cl_xmitcnt, m_pktlen(m));
                        }
                        return m;
                }
        }
        return NULL;
}

static int
priq_addq(struct priq_class *cl, struct mbuf *m)
{

#ifdef ALTQ_RIO
        if (q_is_rio(cl->cl_q))
                return rio_addq((rio_t *)cl->cl_red, cl->cl_q, m,
                                cl->cl_pktattr);
#endif
#ifdef ALTQ_RED
        if (q_is_red(cl->cl_q))
                return red_addq(cl->cl_red, cl->cl_q, m, cl->cl_pktattr);
#endif
        if (qlen(cl->cl_q) >= qlimit(cl->cl_q)) {
                m_freem(m);
                return -1;
        }

        if (cl->cl_flags & PRCF_CLEARDSCP)
                write_dsfield(m, cl->cl_pktattr, 0);

        _addq(cl->cl_q, m);

        return 0;
}

static struct mbuf *
priq_getq(struct priq_class *cl)
{
#ifdef ALTQ_RIO
        if (q_is_rio(cl->cl_q))
                return rio_getq((rio_t *)cl->cl_red, cl->cl_q);
#endif
#ifdef ALTQ_RED
        if (q_is_red(cl->cl_q))
                return red_getq(cl->cl_red, cl->cl_q);
#endif
        return _getq(cl->cl_q);
}

static struct mbuf *
priq_pollq(struct priq_class *cl)
{
        return qhead(cl->cl_q);
}

static void
priq_purgeq(struct priq_class *cl)
{
        struct mbuf *m;

        if (qempty(cl->cl_q))
                return;

        while ((m = _getq(cl->cl_q)) != NULL) {
                PKTCNTR_ADD(&cl->cl_dropcnt, m_pktlen(m));
                m_freem(m);
        }
        ASSERT(qlen(cl->cl_q) == 0);
}

static void
get_class_stats(struct priq_classstats *sp, struct priq_class *cl)
{
        memset(sp, 0, sizeof(*sp));

        sp->class_handle = cl->cl_handle;
        sp->qlength = qlen(cl->cl_q);
        sp->qlimit = qlimit(cl->cl_q);
        sp->period = cl->cl_period;
        sp->xmitcnt = cl->cl_xmitcnt;
        sp->dropcnt = cl->cl_dropcnt;

        sp->qtype = qtype(cl->cl_q);
#ifdef ALTQ_RED
        if (q_is_red(cl->cl_q))
                red_getstats(cl->cl_red, &sp->red[0]);
#endif
#ifdef ALTQ_RIO
        if (q_is_rio(cl->cl_q))
                rio_getstats((rio_t *)cl->cl_red, &sp->red[0]);
#endif

}

/* convert a class handle to the corresponding class pointer */
static struct priq_class *
clh_to_clp(struct priq_if *pif, u_int32_t chandle)
{
        struct priq_class *cl;
        int idx;

        if (chandle == 0)
                return NULL;

        for (idx = pif->pif_maxpri; idx >= 0; idx--)
                if ((cl = pif->pif_classes[idx]) != NULL &&
                    cl->cl_handle == chandle)
                        return cl;

        return NULL;
}


#ifdef ALTQ3_COMPAT

static struct priq_if *
priq_attach(struct ifaltq *ifq, u_int bandwidth)
{
        struct priq_if *pif;

        pif = malloc(sizeof(struct priq_if), M_DEVBUF, M_WAITOK|M_ZERO);
        if (pif == NULL)
                return NULL;
        pif->pif_bandwidth = bandwidth;
        pif->pif_maxpri = -1;
        pif->pif_ifq = ifq;

        /* add this state to the priq list */
        pif->pif_next = pif_list;
        pif_list = pif;

        return pif;
}

static void
priq_detach(struct priq_if *pif)
{
        (void)priq_clear_interface(pif);

        /* remove this interface from the pif list */
        if (pif_list == pif)
                pif_list = pif->pif_next;
        else {
                struct priq_if *p;

                for (p = pif_list; p != NULL; p = p->pif_next)
                        if (p->pif_next == pif) {
                                p->pif_next = pif->pif_next;
                                break;
                        }
                ASSERT(p != NULL);
        }

        free(pif, M_DEVBUF);
}

/*
 * priq device interface
 */
int
priqopen(dev_t dev, int flag, int fmt,
    struct lwp *l)
{
        /* everything will be done when the queueing scheme is attached. */
        return 0;
}

int
priqclose(dev_t dev, int flag, int fmt,
    struct lwp *l)
{
        struct priq_if *pif;

        while ((pif = pif_list) != NULL) {
                /* destroy all */
                if (ALTQ_IS_ENABLED(pif->pif_ifq))
                        altq_disable(pif->pif_ifq);

                int error = altq_detach(pif->pif_ifq);
                switch (error) {
                case 0:
                case ENXIO:     /* already disabled */
                        break;
                default:
                        return error;
                }
                priq_detach(pif);
        }

        return 0;
}

int
priqioctl(dev_t dev, ioctlcmd_t cmd, void *addr, int flag,
    struct lwp *l)
{
        struct priq_if *pif;
        struct priq_interface *ifacep;
        int     error = 0;

        /* check super-user privilege */
        switch (cmd) {
        case PRIQ_GETSTATS:
                break;
        default:
                if ((error = kauth_authorize_network(l->l_cred,
                    KAUTH_NETWORK_ALTQ, KAUTH_REQ_NETWORK_ALTQ_PRIQ, NULL,
                    NULL, NULL)) != 0)
                        return (error);
                break;
        }

        switch (cmd) {

        case PRIQ_IF_ATTACH:
                error = priqcmd_if_attach((struct priq_interface *)addr);
                break;

        case PRIQ_IF_DETACH:
                error = priqcmd_if_detach((struct priq_interface *)addr);
                break;

        case PRIQ_ENABLE:
        case PRIQ_DISABLE:
        case PRIQ_CLEAR:
                ifacep = (struct priq_interface *)addr;
                if ((pif = altq_lookup(ifacep->ifname,
                                       ALTQT_PRIQ)) == NULL) {
                        error = EBADF;
                        break;
                }

                switch (cmd) {
                case PRIQ_ENABLE:
                        if (pif->pif_default == NULL) {
#ifdef ALTQ_DEBUG
                                printf("priq: no default class\n");
#endif
                                error = EINVAL;
                                break;
                        }
                        error = altq_enable(pif->pif_ifq);
                        break;

                case PRIQ_DISABLE:
                        error = altq_disable(pif->pif_ifq);
                        break;

                case PRIQ_CLEAR:
                        priq_clear_interface(pif);
                        break;
                }
                break;

        case PRIQ_ADD_CLASS:
                error = priqcmd_add_class((struct priq_add_class *)addr);
                break;

        case PRIQ_DEL_CLASS:
                error = priqcmd_delete_class((struct priq_delete_class *)addr);
                break;

        case PRIQ_MOD_CLASS:
                error = priqcmd_modify_class((struct priq_modify_class *)addr);
                break;

        case PRIQ_ADD_FILTER:
                error = priqcmd_add_filter((struct priq_add_filter *)addr);
                break;

        case PRIQ_DEL_FILTER:
                error = priqcmd_delete_filter((struct priq_delete_filter *)addr);
                break;

        case PRIQ_GETSTATS:
                error = priqcmd_class_stats((struct priq_class_stats *)addr);
                break;

        default:
                error = EINVAL;
                break;
        }
        return error;
}

static int
priqcmd_if_attach(struct priq_interface *ap)
{
        struct priq_if *pif;
        struct ifnet *ifp;
        int error;

        if ((ifp = ifunit(ap->ifname)) == NULL)
                return ENXIO;

        if ((pif = priq_attach(&ifp->if_snd, ap->arg)) == NULL)
                return ENOMEM;

        /*
         * set PRIQ to this ifnet structure.
         */
        if ((error = altq_attach(&ifp->if_snd, ALTQT_PRIQ, pif,
                                 priq_enqueue, priq_dequeue, priq_request,
                                 &pif->pif_classifier, acc_classify)) != 0)
                priq_detach(pif);

        return error;
}

static int
priqcmd_if_detach(struct priq_interface *ap)
{
        struct priq_if *pif;
        int error;

        if ((pif = altq_lookup(ap->ifname, ALTQT_PRIQ)) == NULL)
                return EBADF;

        if (ALTQ_IS_ENABLED(pif->pif_ifq))
                altq_disable(pif->pif_ifq);

        if ((error = altq_detach(pif->pif_ifq)))
                return error;

        priq_detach(pif);
        return 0;
}

static int
priqcmd_add_class(struct priq_add_class *ap)
{
        struct priq_if *pif;
        struct priq_class *cl;
        int qid;

        if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
                return EBADF;

        if (ap->pri < 0 || ap->pri >= PRIQ_MAXPRI)
                return EINVAL;
        if (pif->pif_classes[ap->pri] != NULL)
                return EBUSY;

        qid = ap->pri + 1;
        if ((cl = priq_class_create(pif, ap->pri,
            ap->qlimit, ap->flags, qid)) == NULL)
                return ENOMEM;

        /* return a class handle to the user */
        ap->class_handle = cl->cl_handle;

        return 0;
}

static int
priqcmd_delete_class(struct priq_delete_class *ap)
{
        struct priq_if *pif;
        struct priq_class *cl;

        if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
                return EBADF;

        if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
                return EINVAL;

        return priq_class_destroy(cl);
}

static int
priqcmd_modify_class(struct priq_modify_class *ap)
{
        struct priq_if *pif;
        struct priq_class *cl;

        if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
                return EBADF;

        if (ap->pri < 0 || ap->pri >= PRIQ_MAXPRI)
                return EINVAL;

        if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
                return EINVAL;

        /*
         * if priority is changed, move the class to the new priority
         */
        if (pif->pif_classes[ap->pri] != cl) {
                if (pif->pif_classes[ap->pri] != NULL)
                        return EEXIST;
                pif->pif_classes[cl->cl_pri] = NULL;
                pif->pif_classes[ap->pri] = cl;
                cl->cl_pri = ap->pri;
        }

        /* call priq_class_create to change class parameters */
        if ((cl = priq_class_create(pif, ap->pri,
            ap->qlimit, ap->flags, ap->class_handle)) == NULL)
                return ENOMEM;
        return 0;
}

static int
priqcmd_add_filter(struct priq_add_filter *ap)
{
        struct priq_if *pif;
        struct priq_class *cl;

        if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
                return EBADF;

        if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
                return EINVAL;

        return acc_add_filter(&pif->pif_classifier, &ap->filter,
                              cl, &ap->filter_handle);
}

static int
priqcmd_delete_filter(struct priq_delete_filter *ap)
{
        struct priq_if *pif;

        if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
                return EBADF;

        return acc_delete_filter(&pif->pif_classifier,
                                 ap->filter_handle);
}

static int
priqcmd_class_stats(struct priq_class_stats *ap)
{
        struct priq_if *pif;
        struct priq_class *cl;
        struct priq_classstats stats, *usp;
        int     pri, error;

        if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
                return EBADF;

        ap->maxpri = pif->pif_maxpri;

        /* then, read the next N classes in the tree */
        usp = ap->stats;
        for (pri = 0; pri <= pif->pif_maxpri; pri++) {
                cl = pif->pif_classes[pri];
                memset(&stats, 0, sizeof(stats));
                if (cl != NULL)
                        get_class_stats(&stats, cl);
                if ((error = copyout((void *)&stats, (void *)usp++,
                                     sizeof(stats))) != 0)
                        return error;
        }
        return 0;
}

#ifdef KLD_MODULE

static struct altqsw priq_sw =
        {"priq", priqopen, priqclose, priqioctl};

ALTQ_MODULE(altq_priq, ALTQT_PRIQ, &priq_sw);
MODULE_DEPEND(altq_priq, altq_red, 1, 1, 1);
MODULE_DEPEND(altq_priq, altq_rio, 1, 1, 1);

#endif /* KLD_MODULE */

#endif /* ALTQ3_COMPAT */
#endif /* ALTQ_PRIQ */