1/*-
2 * Copyright (C) 2000-2003
3 *	Sony Computer Science Laboratories Inc.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $KAME: altq_priq.c,v 1.11 2003/09/17 14:23:25 kjc Exp $
27 * $FreeBSD$
28 */
29/*
30 * priority queue
31 */
32
33#include "opt_altq.h"
34#include "opt_inet.h"
35#include "opt_inet6.h"
36
37#ifdef ALTQ_PRIQ  /* priq is enabled by ALTQ_PRIQ option in opt_altq.h */
38
39#include <sys/param.h>
40#include <sys/malloc.h>
41#include <sys/mbuf.h>
42#include <sys/socket.h>
43#include <sys/sockio.h>
44#include <sys/systm.h>
45#include <sys/proc.h>
46#include <sys/errno.h>
47#include <sys/kernel.h>
48#include <sys/queue.h>
49
50#include <net/if.h>
51#include <net/if_var.h>
52#include <netinet/in.h>
53
54#include <netpfil/pf/pf.h>
55#include <netpfil/pf/pf_altq.h>
56#include <netpfil/pf/pf_mtag.h>
57#include <net/altq/altq.h>
58#ifdef ALTQ3_COMPAT
59#include <net/altq/altq_conf.h>
60#endif
61#include <net/altq/altq_priq.h>
62
63/*
64 * function prototypes
65 */
66#ifdef ALTQ3_COMPAT
67static struct priq_if *priq_attach(struct ifaltq *, u_int);
68static int priq_detach(struct priq_if *);
69#endif
70static int priq_clear_interface(struct priq_if *);
71static int priq_request(struct ifaltq *, int, void *);
72static void priq_purge(struct priq_if *);
73static struct priq_class *priq_class_create(struct priq_if *, int, int, int,
74    int);
75static int priq_class_destroy(struct priq_class *);
76static int priq_enqueue(struct ifaltq *, struct mbuf *, struct altq_pktattr *);
77static struct mbuf *priq_dequeue(struct ifaltq *, int);
78
79static int priq_addq(struct priq_class *, struct mbuf *);
80static struct mbuf *priq_getq(struct priq_class *);
81static struct mbuf *priq_pollq(struct priq_class *);
82static void priq_purgeq(struct priq_class *);
83
84#ifdef ALTQ3_COMPAT
85static int priqcmd_if_attach(struct priq_interface *);
86static int priqcmd_if_detach(struct priq_interface *);
87static int priqcmd_add_class(struct priq_add_class *);
88static int priqcmd_delete_class(struct priq_delete_class *);
89static int priqcmd_modify_class(struct priq_modify_class *);
90static int priqcmd_add_filter(struct priq_add_filter *);
91static int priqcmd_delete_filter(struct priq_delete_filter *);
92static int priqcmd_class_stats(struct priq_class_stats *);
93#endif /* ALTQ3_COMPAT */
94
95static void get_class_stats(struct priq_classstats *, struct priq_class *);
96static struct priq_class *clh_to_clp(struct priq_if *, u_int32_t);
97
98#ifdef ALTQ3_COMPAT
99altqdev_decl(priq);
100
101/* pif_list keeps all priq_if's allocated. */
102static struct priq_if *pif_list = NULL;
103#endif /* ALTQ3_COMPAT */
104
105int
106priq_pfattach(struct pf_altq *a)
107{
108	struct ifnet *ifp;
109	int s, error;
110
111	if ((ifp = ifunit(a->ifname)) == NULL || a->altq_disc == NULL)
112		return (EINVAL);
113	s = splnet();
114	error = altq_attach(&ifp->if_snd, ALTQT_PRIQ, a->altq_disc,
115	    priq_enqueue, priq_dequeue, priq_request, NULL, NULL);
116	splx(s);
117	return (error);
118}
119
120int
121priq_add_altq(struct pf_altq *a)
122{
123	struct priq_if	*pif;
124	struct ifnet	*ifp;
125
126	if ((ifp = ifunit(a->ifname)) == NULL)
127		return (EINVAL);
128	if (!ALTQ_IS_READY(&ifp->if_snd))
129		return (ENODEV);
130
131	pif = malloc(sizeof(struct priq_if), M_DEVBUF, M_NOWAIT | M_ZERO);
132	if (pif == NULL)
133		return (ENOMEM);
134	pif->pif_bandwidth = a->ifbandwidth;
135	pif->pif_maxpri = -1;
136	pif->pif_ifq = &ifp->if_snd;
137
138	/* keep the state in pf_altq */
139	a->altq_disc = pif;
140
141	return (0);
142}
143
144int
145priq_remove_altq(struct pf_altq *a)
146{
147	struct priq_if *pif;
148
149	if ((pif = a->altq_disc) == NULL)
150		return (EINVAL);
151	a->altq_disc = NULL;
152
153	(void)priq_clear_interface(pif);
154
155	free(pif, M_DEVBUF);
156	return (0);
157}
158
159int
160priq_add_queue(struct pf_altq *a)
161{
162	struct priq_if *pif;
163	struct priq_class *cl;
164
165	if ((pif = a->altq_disc) == NULL)
166		return (EINVAL);
167
168	/* check parameters */
169	if (a->priority >= PRIQ_MAXPRI)
170		return (EINVAL);
171	if (a->qid == 0)
172		return (EINVAL);
173	if (pif->pif_classes[a->priority] != NULL)
174		return (EBUSY);
175	if (clh_to_clp(pif, a->qid) != NULL)
176		return (EBUSY);
177
178	cl = priq_class_create(pif, a->priority, a->qlimit,
179	    a->pq_u.priq_opts.flags, a->qid);
180	if (cl == NULL)
181		return (ENOMEM);
182
183	return (0);
184}
185
186int
187priq_remove_queue(struct pf_altq *a)
188{
189	struct priq_if *pif;
190	struct priq_class *cl;
191
192	if ((pif = a->altq_disc) == NULL)
193		return (EINVAL);
194
195	if ((cl = clh_to_clp(pif, a->qid)) == NULL)
196		return (EINVAL);
197
198	return (priq_class_destroy(cl));
199}
200
201int
202priq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes)
203{
204	struct priq_if *pif;
205	struct priq_class *cl;
206	struct priq_classstats stats;
207	int error = 0;
208
209	if ((pif = altq_lookup(a->ifname, ALTQT_PRIQ)) == NULL)
210		return (EBADF);
211
212	if ((cl = clh_to_clp(pif, a->qid)) == NULL)
213		return (EINVAL);
214
215	if (*nbytes < sizeof(stats))
216		return (EINVAL);
217
218	get_class_stats(&stats, cl);
219
220	if ((error = copyout((caddr_t)&stats, ubuf, sizeof(stats))) != 0)
221		return (error);
222	*nbytes = sizeof(stats);
223	return (0);
224}
225
226/*
227 * bring the interface back to the initial state by discarding
228 * all the filters and classes.
229 */
230static int
231priq_clear_interface(struct priq_if *pif)
232{
233	struct priq_class	*cl;
234	int pri;
235
236#ifdef ALTQ3_CLFIER_COMPAT
237	/* free the filters for this interface */
238	acc_discard_filters(&pif->pif_classifier, NULL, 1);
239#endif
240
241	/* clear out the classes */
242	for (pri = 0; pri <= pif->pif_maxpri; pri++)
243		if ((cl = pif->pif_classes[pri]) != NULL)
244			priq_class_destroy(cl);
245
246	return (0);
247}
248
249static int
250priq_request(struct ifaltq *ifq, int req, void *arg)
251{
252	struct priq_if	*pif = (struct priq_if *)ifq->altq_disc;
253
254	IFQ_LOCK_ASSERT(ifq);
255
256	switch (req) {
257	case ALTRQ_PURGE:
258		priq_purge(pif);
259		break;
260	}
261	return (0);
262}
263
264/* discard all the queued packets on the interface */
265static void
266priq_purge(struct priq_if *pif)
267{
268	struct priq_class *cl;
269	int pri;
270
271	for (pri = 0; pri <= pif->pif_maxpri; pri++) {
272		if ((cl = pif->pif_classes[pri]) != NULL && !qempty(cl->cl_q))
273			priq_purgeq(cl);
274	}
275	if (ALTQ_IS_ENABLED(pif->pif_ifq))
276		pif->pif_ifq->ifq_len = 0;
277}
278
279static struct priq_class *
280priq_class_create(struct priq_if *pif, int pri, int qlimit, int flags, int qid)
281{
282	struct priq_class *cl;
283	int s;
284
285#ifndef ALTQ_RED
286	if (flags & PRCF_RED) {
287#ifdef ALTQ_DEBUG
288		printf("priq_class_create: RED not configured for PRIQ!\n");
289#endif
290		return (NULL);
291	}
292#endif
293#ifndef ALTQ_CODEL
294	if (flags & PRCF_CODEL) {
295#ifdef ALTQ_DEBUG
296		printf("priq_class_create: CODEL not configured for PRIQ!\n");
297#endif
298		return (NULL);
299	}
300#endif
301
302	if ((cl = pif->pif_classes[pri]) != NULL) {
303		/* modify the class instead of creating a new one */
304		s = splnet();
305		IFQ_LOCK(cl->cl_pif->pif_ifq);
306		if (!qempty(cl->cl_q))
307			priq_purgeq(cl);
308		IFQ_UNLOCK(cl->cl_pif->pif_ifq);
309		splx(s);
310#ifdef ALTQ_RIO
311		if (q_is_rio(cl->cl_q))
312			rio_destroy((rio_t *)cl->cl_red);
313#endif
314#ifdef ALTQ_RED
315		if (q_is_red(cl->cl_q))
316			red_destroy(cl->cl_red);
317#endif
318#ifdef ALTQ_CODEL
319		if (q_is_codel(cl->cl_q))
320			codel_destroy(cl->cl_codel);
321#endif
322	} else {
323		cl = malloc(sizeof(struct priq_class), M_DEVBUF,
324		    M_NOWAIT | M_ZERO);
325		if (cl == NULL)
326			return (NULL);
327
328		cl->cl_q = malloc(sizeof(class_queue_t), M_DEVBUF,
329		    M_NOWAIT | M_ZERO);
330		if (cl->cl_q == NULL)
331			goto err_ret;
332	}
333
334	pif->pif_classes[pri] = cl;
335	if (flags & PRCF_DEFAULTCLASS)
336		pif->pif_default = cl;
337	if (qlimit == 0)
338		qlimit = 50;  /* use default */
339	qlimit(cl->cl_q) = qlimit;
340	qtype(cl->cl_q) = Q_DROPTAIL;
341	qlen(cl->cl_q) = 0;
342	qsize(cl->cl_q) = 0;
343	cl->cl_flags = flags;
344	cl->cl_pri = pri;
345	if (pri > pif->pif_maxpri)
346		pif->pif_maxpri = pri;
347	cl->cl_pif = pif;
348	cl->cl_handle = qid;
349
350#ifdef ALTQ_RED
351	if (flags & (PRCF_RED|PRCF_RIO)) {
352		int red_flags, red_pkttime;
353
354		red_flags = 0;
355		if (flags & PRCF_ECN)
356			red_flags |= REDF_ECN;
357#ifdef ALTQ_RIO
358		if (flags & PRCF_CLEARDSCP)
359			red_flags |= RIOF_CLEARDSCP;
360#endif
361		if (pif->pif_bandwidth < 8)
362			red_pkttime = 1000 * 1000 * 1000; /* 1 sec */
363		else
364			red_pkttime = (int64_t)pif->pif_ifq->altq_ifp->if_mtu
365			  * 1000 * 1000 * 1000 / (pif->pif_bandwidth / 8);
366#ifdef ALTQ_RIO
367		if (flags & PRCF_RIO) {
368			cl->cl_red = (red_t *)rio_alloc(0, NULL,
369						red_flags, red_pkttime);
370			if (cl->cl_red == NULL)
371				goto err_ret;
372			qtype(cl->cl_q) = Q_RIO;
373		} else
374#endif
375		if (flags & PRCF_RED) {
376			cl->cl_red = red_alloc(0, 0,
377			    qlimit(cl->cl_q) * 10/100,
378			    qlimit(cl->cl_q) * 30/100,
379			    red_flags, red_pkttime);
380			if (cl->cl_red == NULL)
381				goto err_ret;
382			qtype(cl->cl_q) = Q_RED;
383		}
384	}
385#endif /* ALTQ_RED */
386#ifdef ALTQ_CODEL
387	if (flags & PRCF_CODEL) {
388		cl->cl_codel = codel_alloc(5, 100, 0);
389		if (cl->cl_codel != NULL)
390			qtype(cl->cl_q) = Q_CODEL;
391	}
392#endif
393
394	return (cl);
395
396 err_ret:
397	if (cl->cl_red != NULL) {
398#ifdef ALTQ_RIO
399		if (q_is_rio(cl->cl_q))
400			rio_destroy((rio_t *)cl->cl_red);
401#endif
402#ifdef ALTQ_RED
403		if (q_is_red(cl->cl_q))
404			red_destroy(cl->cl_red);
405#endif
406#ifdef ALTQ_CODEL
407		if (q_is_codel(cl->cl_q))
408			codel_destroy(cl->cl_codel);
409#endif
410	}
411	if (cl->cl_q != NULL)
412		free(cl->cl_q, M_DEVBUF);
413	free(cl, M_DEVBUF);
414	return (NULL);
415}
416
417static int
418priq_class_destroy(struct priq_class *cl)
419{
420	struct priq_if *pif;
421	int s, pri;
422
423	s = splnet();
424	IFQ_LOCK(cl->cl_pif->pif_ifq);
425
426#ifdef ALTQ3_CLFIER_COMPAT
427	/* delete filters referencing to this class */
428	acc_discard_filters(&cl->cl_pif->pif_classifier, cl, 0);
429#endif
430
431	if (!qempty(cl->cl_q))
432		priq_purgeq(cl);
433
434	pif = cl->cl_pif;
435	pif->pif_classes[cl->cl_pri] = NULL;
436	if (pif->pif_maxpri == cl->cl_pri) {
437		for (pri = cl->cl_pri; pri >= 0; pri--)
438			if (pif->pif_classes[pri] != NULL) {
439				pif->pif_maxpri = pri;
440				break;
441			}
442		if (pri < 0)
443			pif->pif_maxpri = -1;
444	}
445	IFQ_UNLOCK(cl->cl_pif->pif_ifq);
446	splx(s);
447
448	if (cl->cl_red != NULL) {
449#ifdef ALTQ_RIO
450		if (q_is_rio(cl->cl_q))
451			rio_destroy((rio_t *)cl->cl_red);
452#endif
453#ifdef ALTQ_RED
454		if (q_is_red(cl->cl_q))
455			red_destroy(cl->cl_red);
456#endif
457#ifdef ALTQ_CODEL
458		if (q_is_codel(cl->cl_q))
459			codel_destroy(cl->cl_codel);
460#endif
461	}
462	free(cl->cl_q, M_DEVBUF);
463	free(cl, M_DEVBUF);
464	return (0);
465}
466
467/*
468 * priq_enqueue is an enqueue function to be registered to
469 * (*altq_enqueue) in struct ifaltq.
470 */
471static int
472priq_enqueue(struct ifaltq *ifq, struct mbuf *m, struct altq_pktattr *pktattr)
473{
474	struct priq_if	*pif = (struct priq_if *)ifq->altq_disc;
475	struct priq_class *cl;
476	struct pf_mtag *t;
477	int len;
478
479	IFQ_LOCK_ASSERT(ifq);
480
481	/* grab class set by classifier */
482	if ((m->m_flags & M_PKTHDR) == 0) {
483		/* should not happen */
484		printf("altq: packet for %s does not have pkthdr\n",
485		    ifq->altq_ifp->if_xname);
486		m_freem(m);
487		return (ENOBUFS);
488	}
489	cl = NULL;
490	if ((t = pf_find_mtag(m)) != NULL)
491		cl = clh_to_clp(pif, t->qid);
492#ifdef ALTQ3_COMPAT
493	else if ((ifq->altq_flags & ALTQF_CLASSIFY) && pktattr != NULL)
494		cl = pktattr->pattr_class;
495#endif
496	if (cl == NULL) {
497		cl = pif->pif_default;
498		if (cl == NULL) {
499			m_freem(m);
500			return (ENOBUFS);
501		}
502	}
503#ifdef ALTQ3_COMPAT
504	if (pktattr != NULL)
505		cl->cl_pktattr = pktattr;  /* save proto hdr used by ECN */
506	else
507#endif
508		cl->cl_pktattr = NULL;
509	len = m_pktlen(m);
510	if (priq_addq(cl, m) != 0) {
511		/* drop occurred.  mbuf was freed in priq_addq. */
512		PKTCNTR_ADD(&cl->cl_dropcnt, len);
513		return (ENOBUFS);
514	}
515	IFQ_INC_LEN(ifq);
516
517	/* successfully queued. */
518	return (0);
519}
520
521/*
522 * priq_dequeue is a dequeue function to be registered to
523 * (*altq_dequeue) in struct ifaltq.
524 *
525 * note: ALTDQ_POLL returns the next packet without removing the packet
526 *	from the queue.  ALTDQ_REMOVE is a normal dequeue operation.
527 *	ALTDQ_REMOVE must return the same packet if called immediately
528 *	after ALTDQ_POLL.
529 */
530static struct mbuf *
531priq_dequeue(struct ifaltq *ifq, int op)
532{
533	struct priq_if	*pif = (struct priq_if *)ifq->altq_disc;
534	struct priq_class *cl;
535	struct mbuf *m;
536	int pri;
537
538	IFQ_LOCK_ASSERT(ifq);
539
540	if (IFQ_IS_EMPTY(ifq))
541		/* no packet in the queue */
542		return (NULL);
543
544	for (pri = pif->pif_maxpri;  pri >= 0; pri--) {
545		if ((cl = pif->pif_classes[pri]) != NULL &&
546		    !qempty(cl->cl_q)) {
547			if (op == ALTDQ_POLL)
548				return (priq_pollq(cl));
549
550			m = priq_getq(cl);
551			if (m != NULL) {
552				IFQ_DEC_LEN(ifq);
553				if (qempty(cl->cl_q))
554					cl->cl_period++;
555				PKTCNTR_ADD(&cl->cl_xmitcnt, m_pktlen(m));
556			}
557			return (m);
558		}
559	}
560	return (NULL);
561}
562
563static int
564priq_addq(struct priq_class *cl, struct mbuf *m)
565{
566
567#ifdef ALTQ_RIO
568	if (q_is_rio(cl->cl_q))
569		return rio_addq((rio_t *)cl->cl_red, cl->cl_q, m,
570				cl->cl_pktattr);
571#endif
572#ifdef ALTQ_RED
573	if (q_is_red(cl->cl_q))
574		return red_addq(cl->cl_red, cl->cl_q, m, cl->cl_pktattr);
575#endif
576#ifdef ALTQ_CODEL
577	if (q_is_codel(cl->cl_q))
578		return codel_addq(cl->cl_codel, cl->cl_q, m);
579#endif
580	if (qlen(cl->cl_q) >= qlimit(cl->cl_q)) {
581		m_freem(m);
582		return (-1);
583	}
584
585	if (cl->cl_flags & PRCF_CLEARDSCP)
586		write_dsfield(m, cl->cl_pktattr, 0);
587
588	_addq(cl->cl_q, m);
589
590	return (0);
591}
592
593static struct mbuf *
594priq_getq(struct priq_class *cl)
595{
596#ifdef ALTQ_RIO
597	if (q_is_rio(cl->cl_q))
598		return rio_getq((rio_t *)cl->cl_red, cl->cl_q);
599#endif
600#ifdef ALTQ_RED
601	if (q_is_red(cl->cl_q))
602		return red_getq(cl->cl_red, cl->cl_q);
603#endif
604#ifdef ALTQ_CODEL
605	if (q_is_codel(cl->cl_q))
606		return codel_getq(cl->cl_codel, cl->cl_q);
607#endif
608	return _getq(cl->cl_q);
609}
610
611static struct mbuf *
612priq_pollq(cl)
613	struct priq_class *cl;
614{
615	return qhead(cl->cl_q);
616}
617
618static void
619priq_purgeq(struct priq_class *cl)
620{
621	struct mbuf *m;
622
623	if (qempty(cl->cl_q))
624		return;
625
626	while ((m = _getq(cl->cl_q)) != NULL) {
627		PKTCNTR_ADD(&cl->cl_dropcnt, m_pktlen(m));
628		m_freem(m);
629	}
630	ASSERT(qlen(cl->cl_q) == 0);
631}
632
633static void
634get_class_stats(struct priq_classstats *sp, struct priq_class *cl)
635{
636	sp->class_handle = cl->cl_handle;
637	sp->qlength = qlen(cl->cl_q);
638	sp->qlimit = qlimit(cl->cl_q);
639	sp->period = cl->cl_period;
640	sp->xmitcnt = cl->cl_xmitcnt;
641	sp->dropcnt = cl->cl_dropcnt;
642
643	sp->qtype = qtype(cl->cl_q);
644#ifdef ALTQ_RED
645	if (q_is_red(cl->cl_q))
646		red_getstats(cl->cl_red, &sp->red[0]);
647#endif
648#ifdef ALTQ_RIO
649	if (q_is_rio(cl->cl_q))
650		rio_getstats((rio_t *)cl->cl_red, &sp->red[0]);
651#endif
652#ifdef ALTQ_CODEL
653	if (q_is_codel(cl->cl_q))
654		codel_getstats(cl->cl_codel, &sp->codel);
655#endif
656}
657
658/* convert a class handle to the corresponding class pointer */
659static struct priq_class *
660clh_to_clp(struct priq_if *pif, u_int32_t chandle)
661{
662	struct priq_class *cl;
663	int idx;
664
665	if (chandle == 0)
666		return (NULL);
667
668	for (idx = pif->pif_maxpri; idx >= 0; idx--)
669		if ((cl = pif->pif_classes[idx]) != NULL &&
670		    cl->cl_handle == chandle)
671			return (cl);
672
673	return (NULL);
674}
675
676
677#ifdef ALTQ3_COMPAT
678
679static struct priq_if *
680priq_attach(ifq, bandwidth)
681	struct ifaltq *ifq;
682	u_int bandwidth;
683{
684	struct priq_if *pif;
685
686	pif = malloc(sizeof(struct priq_if),
687	       M_DEVBUF, M_WAITOK);
688	if (pif == NULL)
689		return (NULL);
690	bzero(pif, sizeof(struct priq_if));
691	pif->pif_bandwidth = bandwidth;
692	pif->pif_maxpri = -1;
693	pif->pif_ifq = ifq;
694
695	/* add this state to the priq list */
696	pif->pif_next = pif_list;
697	pif_list = pif;
698
699	return (pif);
700}
701
702static int
703priq_detach(pif)
704	struct priq_if *pif;
705{
706	(void)priq_clear_interface(pif);
707
708	/* remove this interface from the pif list */
709	if (pif_list == pif)
710		pif_list = pif->pif_next;
711	else {
712		struct priq_if *p;
713
714		for (p = pif_list; p != NULL; p = p->pif_next)
715			if (p->pif_next == pif) {
716				p->pif_next = pif->pif_next;
717				break;
718			}
719		ASSERT(p != NULL);
720	}
721
722	free(pif, M_DEVBUF);
723	return (0);
724}
725
726/*
727 * priq device interface
728 */
729int
730priqopen(dev, flag, fmt, p)
731	dev_t dev;
732	int flag, fmt;
733#if (__FreeBSD_version > 500000)
734	struct thread *p;
735#else
736	struct proc *p;
737#endif
738{
739	/* everything will be done when the queueing scheme is attached. */
740	return 0;
741}
742
743int
744priqclose(dev, flag, fmt, p)
745	dev_t dev;
746	int flag, fmt;
747#if (__FreeBSD_version > 500000)
748	struct thread *p;
749#else
750	struct proc *p;
751#endif
752{
753	struct priq_if *pif;
754	int err, error = 0;
755
756	while ((pif = pif_list) != NULL) {
757		/* destroy all */
758		if (ALTQ_IS_ENABLED(pif->pif_ifq))
759			altq_disable(pif->pif_ifq);
760
761		err = altq_detach(pif->pif_ifq);
762		if (err == 0)
763			err = priq_detach(pif);
764		if (err != 0 && error == 0)
765			error = err;
766	}
767
768	return error;
769}
770
771int
772priqioctl(dev, cmd, addr, flag, p)
773	dev_t dev;
774	ioctlcmd_t cmd;
775	caddr_t addr;
776	int flag;
777#if (__FreeBSD_version > 500000)
778	struct thread *p;
779#else
780	struct proc *p;
781#endif
782{
783	struct priq_if *pif;
784	struct priq_interface *ifacep;
785	int	error = 0;
786
787	/* check super-user privilege */
788	switch (cmd) {
789	case PRIQ_GETSTATS:
790		break;
791	default:
792#if (__FreeBSD_version > 700000)
793		if ((error = priv_check(p, PRIV_ALTQ_MANAGE)) != 0)
794			return (error);
795#elsif (__FreeBSD_version > 400000)
796		if ((error = suser(p)) != 0)
797			return (error);
798#else
799		if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
800			return (error);
801#endif
802		break;
803	}
804
805	switch (cmd) {
806
807	case PRIQ_IF_ATTACH:
808		error = priqcmd_if_attach((struct priq_interface *)addr);
809		break;
810
811	case PRIQ_IF_DETACH:
812		error = priqcmd_if_detach((struct priq_interface *)addr);
813		break;
814
815	case PRIQ_ENABLE:
816	case PRIQ_DISABLE:
817	case PRIQ_CLEAR:
818		ifacep = (struct priq_interface *)addr;
819		if ((pif = altq_lookup(ifacep->ifname,
820				       ALTQT_PRIQ)) == NULL) {
821			error = EBADF;
822			break;
823		}
824
825		switch (cmd) {
826		case PRIQ_ENABLE:
827			if (pif->pif_default == NULL) {
828#ifdef ALTQ_DEBUG
829				printf("priq: no default class\n");
830#endif
831				error = EINVAL;
832				break;
833			}
834			error = altq_enable(pif->pif_ifq);
835			break;
836
837		case PRIQ_DISABLE:
838			error = altq_disable(pif->pif_ifq);
839			break;
840
841		case PRIQ_CLEAR:
842			priq_clear_interface(pif);
843			break;
844		}
845		break;
846
847	case PRIQ_ADD_CLASS:
848		error = priqcmd_add_class((struct priq_add_class *)addr);
849		break;
850
851	case PRIQ_DEL_CLASS:
852		error = priqcmd_delete_class((struct priq_delete_class *)addr);
853		break;
854
855	case PRIQ_MOD_CLASS:
856		error = priqcmd_modify_class((struct priq_modify_class *)addr);
857		break;
858
859	case PRIQ_ADD_FILTER:
860		error = priqcmd_add_filter((struct priq_add_filter *)addr);
861		break;
862
863	case PRIQ_DEL_FILTER:
864		error = priqcmd_delete_filter((struct priq_delete_filter *)addr);
865		break;
866
867	case PRIQ_GETSTATS:
868		error = priqcmd_class_stats((struct priq_class_stats *)addr);
869		break;
870
871	default:
872		error = EINVAL;
873		break;
874	}
875	return error;
876}
877
878static int
879priqcmd_if_attach(ap)
880	struct priq_interface *ap;
881{
882	struct priq_if *pif;
883	struct ifnet *ifp;
884	int error;
885
886	if ((ifp = ifunit(ap->ifname)) == NULL)
887		return (ENXIO);
888
889	if ((pif = priq_attach(&ifp->if_snd, ap->arg)) == NULL)
890		return (ENOMEM);
891
892	/*
893	 * set PRIQ to this ifnet structure.
894	 */
895	if ((error = altq_attach(&ifp->if_snd, ALTQT_PRIQ, pif,
896				 priq_enqueue, priq_dequeue, priq_request,
897				 &pif->pif_classifier, acc_classify)) != 0)
898		(void)priq_detach(pif);
899
900	return (error);
901}
902
903static int
904priqcmd_if_detach(ap)
905	struct priq_interface *ap;
906{
907	struct priq_if *pif;
908	int error;
909
910	if ((pif = altq_lookup(ap->ifname, ALTQT_PRIQ)) == NULL)
911		return (EBADF);
912
913	if (ALTQ_IS_ENABLED(pif->pif_ifq))
914		altq_disable(pif->pif_ifq);
915
916	if ((error = altq_detach(pif->pif_ifq)))
917		return (error);
918
919	return priq_detach(pif);
920}
921
922static int
923priqcmd_add_class(ap)
924	struct priq_add_class *ap;
925{
926	struct priq_if *pif;
927	struct priq_class *cl;
928	int qid;
929
930	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
931		return (EBADF);
932
933	if (ap->pri < 0 || ap->pri >= PRIQ_MAXPRI)
934		return (EINVAL);
935	if (pif->pif_classes[ap->pri] != NULL)
936		return (EBUSY);
937
938	qid = ap->pri + 1;
939	if ((cl = priq_class_create(pif, ap->pri,
940	    ap->qlimit, ap->flags, qid)) == NULL)
941		return (ENOMEM);
942
943	/* return a class handle to the user */
944	ap->class_handle = cl->cl_handle;
945
946	return (0);
947}
948
949static int
950priqcmd_delete_class(ap)
951	struct priq_delete_class *ap;
952{
953	struct priq_if *pif;
954	struct priq_class *cl;
955
956	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
957		return (EBADF);
958
959	if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
960		return (EINVAL);
961
962	return priq_class_destroy(cl);
963}
964
965static int
966priqcmd_modify_class(ap)
967	struct priq_modify_class *ap;
968{
969	struct priq_if *pif;
970	struct priq_class *cl;
971
972	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
973		return (EBADF);
974
975	if (ap->pri < 0 || ap->pri >= PRIQ_MAXPRI)
976		return (EINVAL);
977
978	if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
979		return (EINVAL);
980
981	/*
982	 * if priority is changed, move the class to the new priority
983	 */
984	if (pif->pif_classes[ap->pri] != cl) {
985		if (pif->pif_classes[ap->pri] != NULL)
986			return (EEXIST);
987		pif->pif_classes[cl->cl_pri] = NULL;
988		pif->pif_classes[ap->pri] = cl;
989		cl->cl_pri = ap->pri;
990	}
991
992	/* call priq_class_create to change class parameters */
993	if ((cl = priq_class_create(pif, ap->pri,
994	    ap->qlimit, ap->flags, ap->class_handle)) == NULL)
995		return (ENOMEM);
996	return 0;
997}
998
999static int
1000priqcmd_add_filter(ap)
1001	struct priq_add_filter *ap;
1002{
1003	struct priq_if *pif;
1004	struct priq_class *cl;
1005
1006	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
1007		return (EBADF);
1008
1009	if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
1010		return (EINVAL);
1011
1012	return acc_add_filter(&pif->pif_classifier, &ap->filter,
1013			      cl, &ap->filter_handle);
1014}
1015
1016static int
1017priqcmd_delete_filter(ap)
1018	struct priq_delete_filter *ap;
1019{
1020	struct priq_if *pif;
1021
1022	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
1023		return (EBADF);
1024
1025	return acc_delete_filter(&pif->pif_classifier,
1026				 ap->filter_handle);
1027}
1028
1029static int
1030priqcmd_class_stats(ap)
1031	struct priq_class_stats *ap;
1032{
1033	struct priq_if *pif;
1034	struct priq_class *cl;
1035	struct priq_classstats stats, *usp;
1036	int	pri, error;
1037
1038	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
1039		return (EBADF);
1040
1041	ap->maxpri = pif->pif_maxpri;
1042
1043	/* then, read the next N classes in the tree */
1044	usp = ap->stats;
1045	for (pri = 0; pri <= pif->pif_maxpri; pri++) {
1046		cl = pif->pif_classes[pri];
1047		if (cl != NULL)
1048			get_class_stats(&stats, cl);
1049		else
1050			bzero(&stats, sizeof(stats));
1051		if ((error = copyout((caddr_t)&stats, (caddr_t)usp++,
1052				     sizeof(stats))) != 0)
1053			return (error);
1054	}
1055	return (0);
1056}
1057
1058#ifdef KLD_MODULE
1059
1060static struct altqsw priq_sw =
1061	{"priq", priqopen, priqclose, priqioctl};
1062
1063ALTQ_MODULE(altq_priq, ALTQT_PRIQ, &priq_sw);
1064MODULE_DEPEND(altq_priq, altq_red, 1, 1, 1);
1065MODULE_DEPEND(altq_priq, altq_rio, 1, 1, 1);
1066
1067#endif /* KLD_MODULE */
1068
1069#endif /* ALTQ3_COMPAT */
1070#endif /* ALTQ_PRIQ */
1071