altq_priq.c revision 298133 
1/*	$FreeBSD: stable/10/sys/contrib/altq/altq/altq_priq.c 298133 2016-04-16 22:02:32Z loos $	*/
2/*	$KAME: altq_priq.c,v 1.11 2003/09/17 14:23:25 kjc Exp $	*/
3/*
4 * Copyright (C) 2000-2003
5 *	Sony Computer Science Laboratories Inc.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28/*
29 * priority queue
30 */
31
32#if defined(__FreeBSD__) || defined(__NetBSD__)
33#include "opt_altq.h"
34#include "opt_inet.h"
35#ifdef __FreeBSD__
36#include "opt_inet6.h"
37#endif
38#endif /* __FreeBSD__ || __NetBSD__ */
39
40#ifdef ALTQ_PRIQ  /* priq is enabled by ALTQ_PRIQ option in opt_altq.h */
41
42#include <sys/param.h>
43#include <sys/malloc.h>
44#include <sys/mbuf.h>
45#include <sys/socket.h>
46#include <sys/sockio.h>
47#include <sys/systm.h>
48#include <sys/proc.h>
49#include <sys/errno.h>
50#include <sys/kernel.h>
51#include <sys/queue.h>
52
53#include <net/if.h>
54#include <net/if_var.h>
55#include <netinet/in.h>
56
57#include <netpfil/pf/pf.h>
58#include <netpfil/pf/pf_altq.h>
59#include <netpfil/pf/pf_mtag.h>
60#include <altq/altq.h>
61#ifdef ALTQ3_COMPAT
62#include <altq/altq_conf.h>
63#endif
64#include <altq/altq_priq.h>
65
66/*
67 * function prototypes
68 */
69#ifdef ALTQ3_COMPAT
70static struct priq_if *priq_attach(struct ifaltq *, u_int);
71static int priq_detach(struct priq_if *);
72#endif
73static int priq_clear_interface(struct priq_if *);
74static int priq_request(struct ifaltq *, int, void *);
75static void priq_purge(struct priq_if *);
76static struct priq_class *priq_class_create(struct priq_if *, int, int, int,
77    int);
78static int priq_class_destroy(struct priq_class *);
79static int priq_enqueue(struct ifaltq *, struct mbuf *, struct altq_pktattr *);
80static struct mbuf *priq_dequeue(struct ifaltq *, int);
81
82static int priq_addq(struct priq_class *, struct mbuf *);
83static struct mbuf *priq_getq(struct priq_class *);
84static struct mbuf *priq_pollq(struct priq_class *);
85static void priq_purgeq(struct priq_class *);
86
87#ifdef ALTQ3_COMPAT
88static int priqcmd_if_attach(struct priq_interface *);
89static int priqcmd_if_detach(struct priq_interface *);
90static int priqcmd_add_class(struct priq_add_class *);
91static int priqcmd_delete_class(struct priq_delete_class *);
92static int priqcmd_modify_class(struct priq_modify_class *);
93static int priqcmd_add_filter(struct priq_add_filter *);
94static int priqcmd_delete_filter(struct priq_delete_filter *);
95static int priqcmd_class_stats(struct priq_class_stats *);
96#endif /* ALTQ3_COMPAT */
97
98static void get_class_stats(struct priq_classstats *, struct priq_class *);
99static struct priq_class *clh_to_clp(struct priq_if *, u_int32_t);
100
101#ifdef ALTQ3_COMPAT
102altqdev_decl(priq);
103
104/* pif_list keeps all priq_if's allocated. */
105static struct priq_if *pif_list = NULL;
106#endif /* ALTQ3_COMPAT */
107
108int
109priq_pfattach(struct pf_altq *a)
110{
111	struct ifnet *ifp;
112	int s, error;
113
114	if ((ifp = ifunit(a->ifname)) == NULL || a->altq_disc == NULL)
115		return (EINVAL);
116#ifdef __NetBSD__
117	s = splnet();
118#else
119	s = splimp();
120#endif
121	error = altq_attach(&ifp->if_snd, ALTQT_PRIQ, a->altq_disc,
122	    priq_enqueue, priq_dequeue, priq_request, NULL, NULL);
123	splx(s);
124	return (error);
125}
126
127int
128priq_add_altq(struct pf_altq *a)
129{
130	struct priq_if	*pif;
131	struct ifnet	*ifp;
132
133	if ((ifp = ifunit(a->ifname)) == NULL)
134		return (EINVAL);
135	if (!ALTQ_IS_READY(&ifp->if_snd))
136		return (ENODEV);
137
138	pif = malloc(sizeof(struct priq_if), M_DEVBUF, M_NOWAIT | M_ZERO);
139	if (pif == NULL)
140		return (ENOMEM);
141	pif->pif_bandwidth = a->ifbandwidth;
142	pif->pif_maxpri = -1;
143	pif->pif_ifq = &ifp->if_snd;
144
145	/* keep the state in pf_altq */
146	a->altq_disc = pif;
147
148	return (0);
149}
150
151int
152priq_remove_altq(struct pf_altq *a)
153{
154	struct priq_if *pif;
155
156	if ((pif = a->altq_disc) == NULL)
157		return (EINVAL);
158	a->altq_disc = NULL;
159
160	(void)priq_clear_interface(pif);
161
162	free(pif, M_DEVBUF);
163	return (0);
164}
165
166int
167priq_add_queue(struct pf_altq *a)
168{
169	struct priq_if *pif;
170	struct priq_class *cl;
171
172	if ((pif = a->altq_disc) == NULL)
173		return (EINVAL);
174
175	/* check parameters */
176	if (a->priority >= PRIQ_MAXPRI)
177		return (EINVAL);
178	if (a->qid == 0)
179		return (EINVAL);
180	if (pif->pif_classes[a->priority] != NULL)
181		return (EBUSY);
182	if (clh_to_clp(pif, a->qid) != NULL)
183		return (EBUSY);
184
185	cl = priq_class_create(pif, a->priority, a->qlimit,
186	    a->pq_u.priq_opts.flags, a->qid);
187	if (cl == NULL)
188		return (ENOMEM);
189
190	return (0);
191}
192
193int
194priq_remove_queue(struct pf_altq *a)
195{
196	struct priq_if *pif;
197	struct priq_class *cl;
198
199	if ((pif = a->altq_disc) == NULL)
200		return (EINVAL);
201
202	if ((cl = clh_to_clp(pif, a->qid)) == NULL)
203		return (EINVAL);
204
205	return (priq_class_destroy(cl));
206}
207
208int
209priq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes)
210{
211	struct priq_if *pif;
212	struct priq_class *cl;
213	struct priq_classstats stats;
214	int error = 0;
215
216	if ((pif = altq_lookup(a->ifname, ALTQT_PRIQ)) == NULL)
217		return (EBADF);
218
219	if ((cl = clh_to_clp(pif, a->qid)) == NULL)
220		return (EINVAL);
221
222	if (*nbytes < sizeof(stats))
223		return (EINVAL);
224
225	get_class_stats(&stats, cl);
226
227	if ((error = copyout((caddr_t)&stats, ubuf, sizeof(stats))) != 0)
228		return (error);
229	*nbytes = sizeof(stats);
230	return (0);
231}
232
233/*
234 * bring the interface back to the initial state by discarding
235 * all the filters and classes.
236 */
237static int
238priq_clear_interface(struct priq_if *pif)
239{
240	struct priq_class	*cl;
241	int pri;
242
243#ifdef ALTQ3_CLFIER_COMPAT
244	/* free the filters for this interface */
245	acc_discard_filters(&pif->pif_classifier, NULL, 1);
246#endif
247
248	/* clear out the classes */
249	for (pri = 0; pri <= pif->pif_maxpri; pri++)
250		if ((cl = pif->pif_classes[pri]) != NULL)
251			priq_class_destroy(cl);
252
253	return (0);
254}
255
256static int
257priq_request(struct ifaltq *ifq, int req, void *arg)
258{
259	struct priq_if	*pif = (struct priq_if *)ifq->altq_disc;
260
261	IFQ_LOCK_ASSERT(ifq);
262
263	switch (req) {
264	case ALTRQ_PURGE:
265		priq_purge(pif);
266		break;
267	}
268	return (0);
269}
270
271/* discard all the queued packets on the interface */
272static void
273priq_purge(struct priq_if *pif)
274{
275	struct priq_class *cl;
276	int pri;
277
278	for (pri = 0; pri <= pif->pif_maxpri; pri++) {
279		if ((cl = pif->pif_classes[pri]) != NULL && !qempty(cl->cl_q))
280			priq_purgeq(cl);
281	}
282	if (ALTQ_IS_ENABLED(pif->pif_ifq))
283		pif->pif_ifq->ifq_len = 0;
284}
285
286static struct priq_class *
287priq_class_create(struct priq_if *pif, int pri, int qlimit, int flags, int qid)
288{
289	struct priq_class *cl;
290	int s;
291
292#ifndef ALTQ_RED
293	if (flags & PRCF_RED) {
294#ifdef ALTQ_DEBUG
295		printf("priq_class_create: RED not configured for PRIQ!\n");
296#endif
297		return (NULL);
298	}
299#endif
300#ifndef ALTQ_CODEL
301	if (flags & PRCF_CODEL) {
302#ifdef ALTQ_DEBUG
303		printf("priq_class_create: CODEL not configured for PRIQ!\n");
304#endif
305		return (NULL);
306	}
307#endif
308
309	if ((cl = pif->pif_classes[pri]) != NULL) {
310		/* modify the class instead of creating a new one */
311#ifdef __NetBSD__
312		s = splnet();
313#else
314		s = splimp();
315#endif
316		IFQ_LOCK(cl->cl_pif->pif_ifq);
317		if (!qempty(cl->cl_q))
318			priq_purgeq(cl);
319		IFQ_UNLOCK(cl->cl_pif->pif_ifq);
320		splx(s);
321#ifdef ALTQ_RIO
322		if (q_is_rio(cl->cl_q))
323			rio_destroy((rio_t *)cl->cl_red);
324#endif
325#ifdef ALTQ_RED
326		if (q_is_red(cl->cl_q))
327			red_destroy(cl->cl_red);
328#endif
329#ifdef ALTQ_CODEL
330		if (q_is_codel(cl->cl_q))
331			codel_destroy(cl->cl_codel);
332#endif
333	} else {
334		cl = malloc(sizeof(struct priq_class), M_DEVBUF,
335		    M_NOWAIT | M_ZERO);
336		if (cl == NULL)
337			return (NULL);
338
339		cl->cl_q = malloc(sizeof(class_queue_t), M_DEVBUF,
340		    M_NOWAIT | M_ZERO);
341		if (cl->cl_q == NULL)
342			goto err_ret;
343	}
344
345	pif->pif_classes[pri] = cl;
346	if (flags & PRCF_DEFAULTCLASS)
347		pif->pif_default = cl;
348	if (qlimit == 0)
349		qlimit = 50;  /* use default */
350	qlimit(cl->cl_q) = qlimit;
351	qtype(cl->cl_q) = Q_DROPTAIL;
352	qlen(cl->cl_q) = 0;
353	qsize(cl->cl_q) = 0;
354	cl->cl_flags = flags;
355	cl->cl_pri = pri;
356	if (pri > pif->pif_maxpri)
357		pif->pif_maxpri = pri;
358	cl->cl_pif = pif;
359	cl->cl_handle = qid;
360
361#ifdef ALTQ_RED
362	if (flags & (PRCF_RED|PRCF_RIO)) {
363		int red_flags, red_pkttime;
364
365		red_flags = 0;
366		if (flags & PRCF_ECN)
367			red_flags |= REDF_ECN;
368#ifdef ALTQ_RIO
369		if (flags & PRCF_CLEARDSCP)
370			red_flags |= RIOF_CLEARDSCP;
371#endif
372		if (pif->pif_bandwidth < 8)
373			red_pkttime = 1000 * 1000 * 1000; /* 1 sec */
374		else
375			red_pkttime = (int64_t)pif->pif_ifq->altq_ifp->if_mtu
376			  * 1000 * 1000 * 1000 / (pif->pif_bandwidth / 8);
377#ifdef ALTQ_RIO
378		if (flags & PRCF_RIO) {
379			cl->cl_red = (red_t *)rio_alloc(0, NULL,
380						red_flags, red_pkttime);
381			if (cl->cl_red == NULL)
382				goto err_ret;
383			qtype(cl->cl_q) = Q_RIO;
384		} else
385#endif
386		if (flags & PRCF_RED) {
387			cl->cl_red = red_alloc(0, 0,
388			    qlimit(cl->cl_q) * 10/100,
389			    qlimit(cl->cl_q) * 30/100,
390			    red_flags, red_pkttime);
391			if (cl->cl_red == NULL)
392				goto err_ret;
393			qtype(cl->cl_q) = Q_RED;
394		}
395	}
396#endif /* ALTQ_RED */
397#ifdef ALTQ_CODEL
398	if (flags & PRCF_CODEL) {
399		cl->cl_codel = codel_alloc(5, 100, 0);
400		if (cl->cl_codel != NULL)
401			qtype(cl->cl_q) = Q_CODEL;
402	}
403#endif
404
405	return (cl);
406
407 err_ret:
408	if (cl->cl_red != NULL) {
409#ifdef ALTQ_RIO
410		if (q_is_rio(cl->cl_q))
411			rio_destroy((rio_t *)cl->cl_red);
412#endif
413#ifdef ALTQ_RED
414		if (q_is_red(cl->cl_q))
415			red_destroy(cl->cl_red);
416#endif
417#ifdef ALTQ_CODEL
418		if (q_is_codel(cl->cl_q))
419			codel_destroy(cl->cl_codel);
420#endif
421	}
422	if (cl->cl_q != NULL)
423		free(cl->cl_q, M_DEVBUF);
424	free(cl, M_DEVBUF);
425	return (NULL);
426}
427
428static int
429priq_class_destroy(struct priq_class *cl)
430{
431	struct priq_if *pif;
432	int s, pri;
433
434#ifdef __NetBSD__
435	s = splnet();
436#else
437	s = splimp();
438#endif
439	IFQ_LOCK(cl->cl_pif->pif_ifq);
440
441#ifdef ALTQ3_CLFIER_COMPAT
442	/* delete filters referencing to this class */
443	acc_discard_filters(&cl->cl_pif->pif_classifier, cl, 0);
444#endif
445
446	if (!qempty(cl->cl_q))
447		priq_purgeq(cl);
448
449	pif = cl->cl_pif;
450	pif->pif_classes[cl->cl_pri] = NULL;
451	if (pif->pif_maxpri == cl->cl_pri) {
452		for (pri = cl->cl_pri; pri >= 0; pri--)
453			if (pif->pif_classes[pri] != NULL) {
454				pif->pif_maxpri = pri;
455				break;
456			}
457		if (pri < 0)
458			pif->pif_maxpri = -1;
459	}
460	IFQ_UNLOCK(cl->cl_pif->pif_ifq);
461	splx(s);
462
463	if (cl->cl_red != NULL) {
464#ifdef ALTQ_RIO
465		if (q_is_rio(cl->cl_q))
466			rio_destroy((rio_t *)cl->cl_red);
467#endif
468#ifdef ALTQ_RED
469		if (q_is_red(cl->cl_q))
470			red_destroy(cl->cl_red);
471#endif
472#ifdef ALTQ_CODEL
473		if (q_is_codel(cl->cl_q))
474			codel_destroy(cl->cl_codel);
475#endif
476	}
477	free(cl->cl_q, M_DEVBUF);
478	free(cl, M_DEVBUF);
479	return (0);
480}
481
482/*
483 * priq_enqueue is an enqueue function to be registered to
484 * (*altq_enqueue) in struct ifaltq.
485 */
486static int
487priq_enqueue(struct ifaltq *ifq, struct mbuf *m, struct altq_pktattr *pktattr)
488{
489	struct priq_if	*pif = (struct priq_if *)ifq->altq_disc;
490	struct priq_class *cl;
491	struct pf_mtag *t;
492	int len;
493
494	IFQ_LOCK_ASSERT(ifq);
495
496	/* grab class set by classifier */
497	if ((m->m_flags & M_PKTHDR) == 0) {
498		/* should not happen */
499		printf("altq: packet for %s does not have pkthdr\n",
500		    ifq->altq_ifp->if_xname);
501		m_freem(m);
502		return (ENOBUFS);
503	}
504	cl = NULL;
505	if ((t = pf_find_mtag(m)) != NULL)
506		cl = clh_to_clp(pif, t->qid);
507#ifdef ALTQ3_COMPAT
508	else if ((ifq->altq_flags & ALTQF_CLASSIFY) && pktattr != NULL)
509		cl = pktattr->pattr_class;
510#endif
511	if (cl == NULL) {
512		cl = pif->pif_default;
513		if (cl == NULL) {
514			m_freem(m);
515			return (ENOBUFS);
516		}
517	}
518#ifdef ALTQ3_COMPAT
519	if (pktattr != NULL)
520		cl->cl_pktattr = pktattr;  /* save proto hdr used by ECN */
521	else
522#endif
523		cl->cl_pktattr = NULL;
524	len = m_pktlen(m);
525	if (priq_addq(cl, m) != 0) {
526		/* drop occurred.  mbuf was freed in priq_addq. */
527		PKTCNTR_ADD(&cl->cl_dropcnt, len);
528		return (ENOBUFS);
529	}
530	IFQ_INC_LEN(ifq);
531
532	/* successfully queued. */
533	return (0);
534}
535
536/*
537 * priq_dequeue is a dequeue function to be registered to
538 * (*altq_dequeue) in struct ifaltq.
539 *
540 * note: ALTDQ_POLL returns the next packet without removing the packet
541 *	from the queue.  ALTDQ_REMOVE is a normal dequeue operation.
542 *	ALTDQ_REMOVE must return the same packet if called immediately
543 *	after ALTDQ_POLL.
544 */
545static struct mbuf *
546priq_dequeue(struct ifaltq *ifq, int op)
547{
548	struct priq_if	*pif = (struct priq_if *)ifq->altq_disc;
549	struct priq_class *cl;
550	struct mbuf *m;
551	int pri;
552
553	IFQ_LOCK_ASSERT(ifq);
554
555	if (IFQ_IS_EMPTY(ifq))
556		/* no packet in the queue */
557		return (NULL);
558
559	for (pri = pif->pif_maxpri;  pri >= 0; pri--) {
560		if ((cl = pif->pif_classes[pri]) != NULL &&
561		    !qempty(cl->cl_q)) {
562			if (op == ALTDQ_POLL)
563				return (priq_pollq(cl));
564
565			m = priq_getq(cl);
566			if (m != NULL) {
567				IFQ_DEC_LEN(ifq);
568				if (qempty(cl->cl_q))
569					cl->cl_period++;
570				PKTCNTR_ADD(&cl->cl_xmitcnt, m_pktlen(m));
571			}
572			return (m);
573		}
574	}
575	return (NULL);
576}
577
578static int
579priq_addq(struct priq_class *cl, struct mbuf *m)
580{
581
582#ifdef ALTQ_RIO
583	if (q_is_rio(cl->cl_q))
584		return rio_addq((rio_t *)cl->cl_red, cl->cl_q, m,
585				cl->cl_pktattr);
586#endif
587#ifdef ALTQ_RED
588	if (q_is_red(cl->cl_q))
589		return red_addq(cl->cl_red, cl->cl_q, m, cl->cl_pktattr);
590#endif
591#ifdef ALTQ_CODEL
592	if (q_is_codel(cl->cl_q))
593		return codel_addq(cl->cl_codel, cl->cl_q, m);
594#endif
595	if (qlen(cl->cl_q) >= qlimit(cl->cl_q)) {
596		m_freem(m);
597		return (-1);
598	}
599
600	if (cl->cl_flags & PRCF_CLEARDSCP)
601		write_dsfield(m, cl->cl_pktattr, 0);
602
603	_addq(cl->cl_q, m);
604
605	return (0);
606}
607
608static struct mbuf *
609priq_getq(struct priq_class *cl)
610{
611#ifdef ALTQ_RIO
612	if (q_is_rio(cl->cl_q))
613		return rio_getq((rio_t *)cl->cl_red, cl->cl_q);
614#endif
615#ifdef ALTQ_RED
616	if (q_is_red(cl->cl_q))
617		return red_getq(cl->cl_red, cl->cl_q);
618#endif
619#ifdef ALTQ_CODEL
620	if (q_is_codel(cl->cl_q))
621		return codel_getq(cl->cl_codel, cl->cl_q);
622#endif
623	return _getq(cl->cl_q);
624}
625
626static struct mbuf *
627priq_pollq(cl)
628	struct priq_class *cl;
629{
630	return qhead(cl->cl_q);
631}
632
633static void
634priq_purgeq(struct priq_class *cl)
635{
636	struct mbuf *m;
637
638	if (qempty(cl->cl_q))
639		return;
640
641	while ((m = _getq(cl->cl_q)) != NULL) {
642		PKTCNTR_ADD(&cl->cl_dropcnt, m_pktlen(m));
643		m_freem(m);
644	}
645	ASSERT(qlen(cl->cl_q) == 0);
646}
647
648static void
649get_class_stats(struct priq_classstats *sp, struct priq_class *cl)
650{
651	sp->class_handle = cl->cl_handle;
652	sp->qlength = qlen(cl->cl_q);
653	sp->qlimit = qlimit(cl->cl_q);
654	sp->period = cl->cl_period;
655	sp->xmitcnt = cl->cl_xmitcnt;
656	sp->dropcnt = cl->cl_dropcnt;
657
658	sp->qtype = qtype(cl->cl_q);
659#ifdef ALTQ_RED
660	if (q_is_red(cl->cl_q))
661		red_getstats(cl->cl_red, &sp->red[0]);
662#endif
663#ifdef ALTQ_RIO
664	if (q_is_rio(cl->cl_q))
665		rio_getstats((rio_t *)cl->cl_red, &sp->red[0]);
666#endif
667#ifdef ALTQ_CODEL
668	if (q_is_codel(cl->cl_q))
669		codel_getstats(cl->cl_codel, &sp->codel);
670#endif
671}
672
673/* convert a class handle to the corresponding class pointer */
674static struct priq_class *
675clh_to_clp(struct priq_if *pif, u_int32_t chandle)
676{
677	struct priq_class *cl;
678	int idx;
679
680	if (chandle == 0)
681		return (NULL);
682
683	for (idx = pif->pif_maxpri; idx >= 0; idx--)
684		if ((cl = pif->pif_classes[idx]) != NULL &&
685		    cl->cl_handle == chandle)
686			return (cl);
687
688	return (NULL);
689}
690
691
692#ifdef ALTQ3_COMPAT
693
694static struct priq_if *
695priq_attach(ifq, bandwidth)
696	struct ifaltq *ifq;
697	u_int bandwidth;
698{
699	struct priq_if *pif;
700
701	pif = malloc(sizeof(struct priq_if),
702	       M_DEVBUF, M_WAITOK);
703	if (pif == NULL)
704		return (NULL);
705	bzero(pif, sizeof(struct priq_if));
706	pif->pif_bandwidth = bandwidth;
707	pif->pif_maxpri = -1;
708	pif->pif_ifq = ifq;
709
710	/* add this state to the priq list */
711	pif->pif_next = pif_list;
712	pif_list = pif;
713
714	return (pif);
715}
716
717static int
718priq_detach(pif)
719	struct priq_if *pif;
720{
721	(void)priq_clear_interface(pif);
722
723	/* remove this interface from the pif list */
724	if (pif_list == pif)
725		pif_list = pif->pif_next;
726	else {
727		struct priq_if *p;
728
729		for (p = pif_list; p != NULL; p = p->pif_next)
730			if (p->pif_next == pif) {
731				p->pif_next = pif->pif_next;
732				break;
733			}
734		ASSERT(p != NULL);
735	}
736
737	free(pif, M_DEVBUF);
738	return (0);
739}
740
741/*
742 * priq device interface
743 */
744int
745priqopen(dev, flag, fmt, p)
746	dev_t dev;
747	int flag, fmt;
748#if (__FreeBSD_version > 500000)
749	struct thread *p;
750#else
751	struct proc *p;
752#endif
753{
754	/* everything will be done when the queueing scheme is attached. */
755	return 0;
756}
757
758int
759priqclose(dev, flag, fmt, p)
760	dev_t dev;
761	int flag, fmt;
762#if (__FreeBSD_version > 500000)
763	struct thread *p;
764#else
765	struct proc *p;
766#endif
767{
768	struct priq_if *pif;
769	int err, error = 0;
770
771	while ((pif = pif_list) != NULL) {
772		/* destroy all */
773		if (ALTQ_IS_ENABLED(pif->pif_ifq))
774			altq_disable(pif->pif_ifq);
775
776		err = altq_detach(pif->pif_ifq);
777		if (err == 0)
778			err = priq_detach(pif);
779		if (err != 0 && error == 0)
780			error = err;
781	}
782
783	return error;
784}
785
786int
787priqioctl(dev, cmd, addr, flag, p)
788	dev_t dev;
789	ioctlcmd_t cmd;
790	caddr_t addr;
791	int flag;
792#if (__FreeBSD_version > 500000)
793	struct thread *p;
794#else
795	struct proc *p;
796#endif
797{
798	struct priq_if *pif;
799	struct priq_interface *ifacep;
800	int	error = 0;
801
802	/* check super-user privilege */
803	switch (cmd) {
804	case PRIQ_GETSTATS:
805		break;
806	default:
807#if (__FreeBSD_version > 700000)
808		if ((error = priv_check(p, PRIV_ALTQ_MANAGE)) != 0)
809			return (error);
810#elsif (__FreeBSD_version > 400000)
811		if ((error = suser(p)) != 0)
812			return (error);
813#else
814		if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
815			return (error);
816#endif
817		break;
818	}
819
820	switch (cmd) {
821
822	case PRIQ_IF_ATTACH:
823		error = priqcmd_if_attach((struct priq_interface *)addr);
824		break;
825
826	case PRIQ_IF_DETACH:
827		error = priqcmd_if_detach((struct priq_interface *)addr);
828		break;
829
830	case PRIQ_ENABLE:
831	case PRIQ_DISABLE:
832	case PRIQ_CLEAR:
833		ifacep = (struct priq_interface *)addr;
834		if ((pif = altq_lookup(ifacep->ifname,
835				       ALTQT_PRIQ)) == NULL) {
836			error = EBADF;
837			break;
838		}
839
840		switch (cmd) {
841		case PRIQ_ENABLE:
842			if (pif->pif_default == NULL) {
843#ifdef ALTQ_DEBUG
844				printf("priq: no default class\n");
845#endif
846				error = EINVAL;
847				break;
848			}
849			error = altq_enable(pif->pif_ifq);
850			break;
851
852		case PRIQ_DISABLE:
853			error = altq_disable(pif->pif_ifq);
854			break;
855
856		case PRIQ_CLEAR:
857			priq_clear_interface(pif);
858			break;
859		}
860		break;
861
862	case PRIQ_ADD_CLASS:
863		error = priqcmd_add_class((struct priq_add_class *)addr);
864		break;
865
866	case PRIQ_DEL_CLASS:
867		error = priqcmd_delete_class((struct priq_delete_class *)addr);
868		break;
869
870	case PRIQ_MOD_CLASS:
871		error = priqcmd_modify_class((struct priq_modify_class *)addr);
872		break;
873
874	case PRIQ_ADD_FILTER:
875		error = priqcmd_add_filter((struct priq_add_filter *)addr);
876		break;
877
878	case PRIQ_DEL_FILTER:
879		error = priqcmd_delete_filter((struct priq_delete_filter *)addr);
880		break;
881
882	case PRIQ_GETSTATS:
883		error = priqcmd_class_stats((struct priq_class_stats *)addr);
884		break;
885
886	default:
887		error = EINVAL;
888		break;
889	}
890	return error;
891}
892
893static int
894priqcmd_if_attach(ap)
895	struct priq_interface *ap;
896{
897	struct priq_if *pif;
898	struct ifnet *ifp;
899	int error;
900
901	if ((ifp = ifunit(ap->ifname)) == NULL)
902		return (ENXIO);
903
904	if ((pif = priq_attach(&ifp->if_snd, ap->arg)) == NULL)
905		return (ENOMEM);
906
907	/*
908	 * set PRIQ to this ifnet structure.
909	 */
910	if ((error = altq_attach(&ifp->if_snd, ALTQT_PRIQ, pif,
911				 priq_enqueue, priq_dequeue, priq_request,
912				 &pif->pif_classifier, acc_classify)) != 0)
913		(void)priq_detach(pif);
914
915	return (error);
916}
917
918static int
919priqcmd_if_detach(ap)
920	struct priq_interface *ap;
921{
922	struct priq_if *pif;
923	int error;
924
925	if ((pif = altq_lookup(ap->ifname, ALTQT_PRIQ)) == NULL)
926		return (EBADF);
927
928	if (ALTQ_IS_ENABLED(pif->pif_ifq))
929		altq_disable(pif->pif_ifq);
930
931	if ((error = altq_detach(pif->pif_ifq)))
932		return (error);
933
934	return priq_detach(pif);
935}
936
937static int
938priqcmd_add_class(ap)
939	struct priq_add_class *ap;
940{
941	struct priq_if *pif;
942	struct priq_class *cl;
943	int qid;
944
945	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
946		return (EBADF);
947
948	if (ap->pri < 0 || ap->pri >= PRIQ_MAXPRI)
949		return (EINVAL);
950	if (pif->pif_classes[ap->pri] != NULL)
951		return (EBUSY);
952
953	qid = ap->pri + 1;
954	if ((cl = priq_class_create(pif, ap->pri,
955	    ap->qlimit, ap->flags, qid)) == NULL)
956		return (ENOMEM);
957
958	/* return a class handle to the user */
959	ap->class_handle = cl->cl_handle;
960
961	return (0);
962}
963
964static int
965priqcmd_delete_class(ap)
966	struct priq_delete_class *ap;
967{
968	struct priq_if *pif;
969	struct priq_class *cl;
970
971	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
972		return (EBADF);
973
974	if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
975		return (EINVAL);
976
977	return priq_class_destroy(cl);
978}
979
980static int
981priqcmd_modify_class(ap)
982	struct priq_modify_class *ap;
983{
984	struct priq_if *pif;
985	struct priq_class *cl;
986
987	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
988		return (EBADF);
989
990	if (ap->pri < 0 || ap->pri >= PRIQ_MAXPRI)
991		return (EINVAL);
992
993	if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
994		return (EINVAL);
995
996	/*
997	 * if priority is changed, move the class to the new priority
998	 */
999	if (pif->pif_classes[ap->pri] != cl) {
1000		if (pif->pif_classes[ap->pri] != NULL)
1001			return (EEXIST);
1002		pif->pif_classes[cl->cl_pri] = NULL;
1003		pif->pif_classes[ap->pri] = cl;
1004		cl->cl_pri = ap->pri;
1005	}
1006
1007	/* call priq_class_create to change class parameters */
1008	if ((cl = priq_class_create(pif, ap->pri,
1009	    ap->qlimit, ap->flags, ap->class_handle)) == NULL)
1010		return (ENOMEM);
1011	return 0;
1012}
1013
1014static int
1015priqcmd_add_filter(ap)
1016	struct priq_add_filter *ap;
1017{
1018	struct priq_if *pif;
1019	struct priq_class *cl;
1020
1021	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
1022		return (EBADF);
1023
1024	if ((cl = clh_to_clp(pif, ap->class_handle)) == NULL)
1025		return (EINVAL);
1026
1027	return acc_add_filter(&pif->pif_classifier, &ap->filter,
1028			      cl, &ap->filter_handle);
1029}
1030
1031static int
1032priqcmd_delete_filter(ap)
1033	struct priq_delete_filter *ap;
1034{
1035	struct priq_if *pif;
1036
1037	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
1038		return (EBADF);
1039
1040	return acc_delete_filter(&pif->pif_classifier,
1041				 ap->filter_handle);
1042}
1043
1044static int
1045priqcmd_class_stats(ap)
1046	struct priq_class_stats *ap;
1047{
1048	struct priq_if *pif;
1049	struct priq_class *cl;
1050	struct priq_classstats stats, *usp;
1051	int	pri, error;
1052
1053	if ((pif = altq_lookup(ap->iface.ifname, ALTQT_PRIQ)) == NULL)
1054		return (EBADF);
1055
1056	ap->maxpri = pif->pif_maxpri;
1057
1058	/* then, read the next N classes in the tree */
1059	usp = ap->stats;
1060	for (pri = 0; pri <= pif->pif_maxpri; pri++) {
1061		cl = pif->pif_classes[pri];
1062		if (cl != NULL)
1063			get_class_stats(&stats, cl);
1064		else
1065			bzero(&stats, sizeof(stats));
1066		if ((error = copyout((caddr_t)&stats, (caddr_t)usp++,
1067				     sizeof(stats))) != 0)
1068			return (error);
1069	}
1070	return (0);
1071}
1072
1073#ifdef KLD_MODULE
1074
1075static struct altqsw priq_sw =
1076	{"priq", priqopen, priqclose, priqioctl};
1077
1078ALTQ_MODULE(altq_priq, ALTQT_PRIQ, &priq_sw);
1079MODULE_DEPEND(altq_priq, altq_red, 1, 1, 1);
1080MODULE_DEPEND(altq_priq, altq_rio, 1, 1, 1);
1081
1082#endif /* KLD_MODULE */
1083
1084#endif /* ALTQ3_COMPAT */
1085#endif /* ALTQ_PRIQ */
1086