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/net/sched/sch_atm.c

http://github.com/mirrors/linux
C | 707 lines | 558 code | 75 blank | 74 comment | 87 complexity | b072e1179cbd0dc7d4ab0e6488140321 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
  3
  4/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
  5
  6#include <linux/module.h>
  7#include <linux/slab.h>
  8#include <linux/init.h>
  9#include <linux/interrupt.h>
 10#include <linux/string.h>
 11#include <linux/errno.h>
 12#include <linux/skbuff.h>
 13#include <linux/atmdev.h>
 14#include <linux/atmclip.h>
 15#include <linux/rtnetlink.h>
 16#include <linux/file.h>		/* for fput */
 17#include <net/netlink.h>
 18#include <net/pkt_sched.h>
 19#include <net/pkt_cls.h>
 20
 21/*
 22 * The ATM queuing discipline provides a framework for invoking classifiers
 23 * (aka "filters"), which in turn select classes of this queuing discipline.
 24 * Each class maps the flow(s) it is handling to a given VC. Multiple classes
 25 * may share the same VC.
 26 *
 27 * When creating a class, VCs are specified by passing the number of the open
 28 * socket descriptor by which the calling process references the VC. The kernel
 29 * keeps the VC open at least until all classes using it are removed.
 30 *
 31 * In this file, most functions are named atm_tc_* to avoid confusion with all
 32 * the atm_* in net/atm. This naming convention differs from what's used in the
 33 * rest of net/sched.
 34 *
 35 * Known bugs:
 36 *  - sometimes messes up the IP stack
 37 *  - any manipulations besides the few operations described in the README, are
 38 *    untested and likely to crash the system
 39 *  - should lock the flow while there is data in the queue (?)
 40 */
 41
 42#define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
 43
 44struct atm_flow_data {
 45	struct Qdisc_class_common common;
 46	struct Qdisc		*q;	/* FIFO, TBF, etc. */
 47	struct tcf_proto __rcu	*filter_list;
 48	struct tcf_block	*block;
 49	struct atm_vcc		*vcc;	/* VCC; NULL if VCC is closed */
 50	void			(*old_pop)(struct atm_vcc *vcc,
 51					   struct sk_buff *skb); /* chaining */
 52	struct atm_qdisc_data	*parent;	/* parent qdisc */
 53	struct socket		*sock;		/* for closing */
 54	int			ref;		/* reference count */
 55	struct gnet_stats_basic_packed	bstats;
 56	struct gnet_stats_queue	qstats;
 57	struct list_head	list;
 58	struct atm_flow_data	*excess;	/* flow for excess traffic;
 59						   NULL to set CLP instead */
 60	int			hdr_len;
 61	unsigned char		hdr[];		/* header data; MUST BE LAST */
 62};
 63
 64struct atm_qdisc_data {
 65	struct atm_flow_data	link;		/* unclassified skbs go here */
 66	struct list_head	flows;		/* NB: "link" is also on this
 67						   list */
 68	struct tasklet_struct	task;		/* dequeue tasklet */
 69};
 70
 71/* ------------------------- Class/flow operations ------------------------- */
 72
 73static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
 74{
 75	struct atm_qdisc_data *p = qdisc_priv(sch);
 76	struct atm_flow_data *flow;
 77
 78	list_for_each_entry(flow, &p->flows, list) {
 79		if (flow->common.classid == classid)
 80			return flow;
 81	}
 82	return NULL;
 83}
 84
 85static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
 86			struct Qdisc *new, struct Qdisc **old,
 87			struct netlink_ext_ack *extack)
 88{
 89	struct atm_qdisc_data *p = qdisc_priv(sch);
 90	struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 91
 92	pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
 93		sch, p, flow, new, old);
 94	if (list_empty(&flow->list))
 95		return -EINVAL;
 96	if (!new)
 97		new = &noop_qdisc;
 98	*old = flow->q;
 99	flow->q = new;
100	if (*old)
101		qdisc_reset(*old);
102	return 0;
103}
104
105static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
106{
107	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
108
109	pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
110	return flow ? flow->q : NULL;
111}
112
113static unsigned long atm_tc_find(struct Qdisc *sch, u32 classid)
114{
115	struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
116	struct atm_flow_data *flow;
117
118	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
119	flow = lookup_flow(sch, classid);
120	pr_debug("%s: flow %p\n", __func__, flow);
121	return (unsigned long)flow;
122}
123
124static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
125					unsigned long parent, u32 classid)
126{
127	struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
128	struct atm_flow_data *flow;
129
130	pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
131	flow = lookup_flow(sch, classid);
132	if (flow)
133		flow->ref++;
134	pr_debug("%s: flow %p\n", __func__, flow);
135	return (unsigned long)flow;
136}
137
138/*
139 * atm_tc_put handles all destructions, including the ones that are explicitly
140 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
141 * anything that still seems to be in use.
142 */
143static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
144{
145	struct atm_qdisc_data *p = qdisc_priv(sch);
146	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
147
148	pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
149	if (--flow->ref)
150		return;
151	pr_debug("atm_tc_put: destroying\n");
152	list_del_init(&flow->list);
153	pr_debug("atm_tc_put: qdisc %p\n", flow->q);
154	qdisc_put(flow->q);
155	tcf_block_put(flow->block);
156	if (flow->sock) {
157		pr_debug("atm_tc_put: f_count %ld\n",
158			file_count(flow->sock->file));
159		flow->vcc->pop = flow->old_pop;
160		sockfd_put(flow->sock);
161	}
162	if (flow->excess)
163		atm_tc_put(sch, (unsigned long)flow->excess);
164	if (flow != &p->link)
165		kfree(flow);
166	/*
167	 * If flow == &p->link, the qdisc no longer works at this point and
168	 * needs to be removed. (By the caller of atm_tc_put.)
169	 */
170}
171
172static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
173{
174	struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
175
176	pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
177	VCC2FLOW(vcc)->old_pop(vcc, skb);
178	tasklet_schedule(&p->task);
179}
180
181static const u8 llc_oui_ip[] = {
182	0xaa,			/* DSAP: non-ISO */
183	0xaa,			/* SSAP: non-ISO */
184	0x03,			/* Ctrl: Unnumbered Information Command PDU */
185	0x00,			/* OUI: EtherType */
186	0x00, 0x00,
187	0x08, 0x00
188};				/* Ethertype IP (0800) */
189
190static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
191	[TCA_ATM_FD]		= { .type = NLA_U32 },
192	[TCA_ATM_EXCESS]	= { .type = NLA_U32 },
193};
194
195static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
196			 struct nlattr **tca, unsigned long *arg,
197			 struct netlink_ext_ack *extack)
198{
199	struct atm_qdisc_data *p = qdisc_priv(sch);
200	struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
201	struct atm_flow_data *excess = NULL;
202	struct nlattr *opt = tca[TCA_OPTIONS];
203	struct nlattr *tb[TCA_ATM_MAX + 1];
204	struct socket *sock;
205	int fd, error, hdr_len;
206	void *hdr;
207
208	pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
209		"flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
210	/*
211	 * The concept of parents doesn't apply for this qdisc.
212	 */
213	if (parent && parent != TC_H_ROOT && parent != sch->handle)
214		return -EINVAL;
215	/*
216	 * ATM classes cannot be changed. In order to change properties of the
217	 * ATM connection, that socket needs to be modified directly (via the
218	 * native ATM API. In order to send a flow to a different VC, the old
219	 * class needs to be removed and a new one added. (This may be changed
220	 * later.)
221	 */
222	if (flow)
223		return -EBUSY;
224	if (opt == NULL)
225		return -EINVAL;
226
227	error = nla_parse_nested_deprecated(tb, TCA_ATM_MAX, opt, atm_policy,
228					    NULL);
229	if (error < 0)
230		return error;
231
232	if (!tb[TCA_ATM_FD])
233		return -EINVAL;
234	fd = nla_get_u32(tb[TCA_ATM_FD]);
235	pr_debug("atm_tc_change: fd %d\n", fd);
236	if (tb[TCA_ATM_HDR]) {
237		hdr_len = nla_len(tb[TCA_ATM_HDR]);
238		hdr = nla_data(tb[TCA_ATM_HDR]);
239	} else {
240		hdr_len = RFC1483LLC_LEN;
241		hdr = NULL;	/* default LLC/SNAP for IP */
242	}
243	if (!tb[TCA_ATM_EXCESS])
244		excess = NULL;
245	else {
246		excess = (struct atm_flow_data *)
247			atm_tc_find(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
248		if (!excess)
249			return -ENOENT;
250	}
251	pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
252		 opt->nla_type, nla_len(opt), hdr_len);
253	sock = sockfd_lookup(fd, &error);
254	if (!sock)
255		return error;	/* f_count++ */
256	pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
257	if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
258		error = -EPROTOTYPE;
259		goto err_out;
260	}
261	/* @@@ should check if the socket is really operational or we'll crash
262	   on vcc->send */
263	if (classid) {
264		if (TC_H_MAJ(classid ^ sch->handle)) {
265			pr_debug("atm_tc_change: classid mismatch\n");
266			error = -EINVAL;
267			goto err_out;
268		}
269	} else {
270		int i;
271		unsigned long cl;
272
273		for (i = 1; i < 0x8000; i++) {
274			classid = TC_H_MAKE(sch->handle, 0x8000 | i);
275			cl = atm_tc_find(sch, classid);
276			if (!cl)
277				break;
278		}
279	}
280	pr_debug("atm_tc_change: new id %x\n", classid);
281	flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
282	pr_debug("atm_tc_change: flow %p\n", flow);
283	if (!flow) {
284		error = -ENOBUFS;
285		goto err_out;
286	}
287
288	error = tcf_block_get(&flow->block, &flow->filter_list, sch,
289			      extack);
290	if (error) {
291		kfree(flow);
292		goto err_out;
293	}
294
295	flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid,
296				    extack);
297	if (!flow->q)
298		flow->q = &noop_qdisc;
299	pr_debug("atm_tc_change: qdisc %p\n", flow->q);
300	flow->sock = sock;
301	flow->vcc = ATM_SD(sock);	/* speedup */
302	flow->vcc->user_back = flow;
303	pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
304	flow->old_pop = flow->vcc->pop;
305	flow->parent = p;
306	flow->vcc->pop = sch_atm_pop;
307	flow->common.classid = classid;
308	flow->ref = 1;
309	flow->excess = excess;
310	list_add(&flow->list, &p->link.list);
311	flow->hdr_len = hdr_len;
312	if (hdr)
313		memcpy(flow->hdr, hdr, hdr_len);
314	else
315		memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
316	*arg = (unsigned long)flow;
317	return 0;
318err_out:
319	sockfd_put(sock);
320	return error;
321}
322
323static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
324{
325	struct atm_qdisc_data *p = qdisc_priv(sch);
326	struct atm_flow_data *flow = (struct atm_flow_data *)arg;
327
328	pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
329	if (list_empty(&flow->list))
330		return -EINVAL;
331	if (rcu_access_pointer(flow->filter_list) || flow == &p->link)
332		return -EBUSY;
333	/*
334	 * Reference count must be 2: one for "keepalive" (set at class
335	 * creation), and one for the reference held when calling delete.
336	 */
337	if (flow->ref < 2) {
338		pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
339		return -EINVAL;
340	}
341	if (flow->ref > 2)
342		return -EBUSY;	/* catch references via excess, etc. */
343	atm_tc_put(sch, arg);
344	return 0;
345}
346
347static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
348{
349	struct atm_qdisc_data *p = qdisc_priv(sch);
350	struct atm_flow_data *flow;
351
352	pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
353	if (walker->stop)
354		return;
355	list_for_each_entry(flow, &p->flows, list) {
356		if (walker->count >= walker->skip &&
357		    walker->fn(sch, (unsigned long)flow, walker) < 0) {
358			walker->stop = 1;
359			break;
360		}
361		walker->count++;
362	}
363}
364
365static struct tcf_block *atm_tc_tcf_block(struct Qdisc *sch, unsigned long cl,
366					  struct netlink_ext_ack *extack)
367{
368	struct atm_qdisc_data *p = qdisc_priv(sch);
369	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
370
371	pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
372	return flow ? flow->block : p->link.block;
373}
374
375/* --------------------------- Qdisc operations ---------------------------- */
376
377static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
378			  struct sk_buff **to_free)
379{
380	struct atm_qdisc_data *p = qdisc_priv(sch);
381	struct atm_flow_data *flow;
382	struct tcf_result res;
383	int result;
384	int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
385
386	pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
387	result = TC_ACT_OK;	/* be nice to gcc */
388	flow = NULL;
389	if (TC_H_MAJ(skb->priority) != sch->handle ||
390	    !(flow = (struct atm_flow_data *)atm_tc_find(sch, skb->priority))) {
391		struct tcf_proto *fl;
392
393		list_for_each_entry(flow, &p->flows, list) {
394			fl = rcu_dereference_bh(flow->filter_list);
395			if (fl) {
396				result = tcf_classify(skb, fl, &res, true);
397				if (result < 0)
398					continue;
399				flow = (struct atm_flow_data *)res.class;
400				if (!flow)
401					flow = lookup_flow(sch, res.classid);
402				goto done;
403			}
404		}
405		flow = NULL;
406done:
407		;
408	}
409	if (!flow) {
410		flow = &p->link;
411	} else {
412		if (flow->vcc)
413			ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
414		/*@@@ looks good ... but it's not supposed to work :-) */
415#ifdef CONFIG_NET_CLS_ACT
416		switch (result) {
417		case TC_ACT_QUEUED:
418		case TC_ACT_STOLEN:
419		case TC_ACT_TRAP:
420			__qdisc_drop(skb, to_free);
421			return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
422		case TC_ACT_SHOT:
423			__qdisc_drop(skb, to_free);
424			goto drop;
425		case TC_ACT_RECLASSIFY:
426			if (flow->excess)
427				flow = flow->excess;
428			else
429				ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
430			break;
431		}
432#endif
433	}
434
435	ret = qdisc_enqueue(skb, flow->q, to_free);
436	if (ret != NET_XMIT_SUCCESS) {
437drop: __maybe_unused
438		if (net_xmit_drop_count(ret)) {
439			qdisc_qstats_drop(sch);
440			if (flow)
441				flow->qstats.drops++;
442		}
443		return ret;
444	}
445	/*
446	 * Okay, this may seem weird. We pretend we've dropped the packet if
447	 * it goes via ATM. The reason for this is that the outer qdisc
448	 * expects to be able to q->dequeue the packet later on if we return
449	 * success at this place. Also, sch->q.qdisc needs to reflect whether
450	 * there is a packet egligible for dequeuing or not. Note that the
451	 * statistics of the outer qdisc are necessarily wrong because of all
452	 * this. There's currently no correct solution for this.
453	 */
454	if (flow == &p->link) {
455		sch->q.qlen++;
456		return NET_XMIT_SUCCESS;
457	}
458	tasklet_schedule(&p->task);
459	return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
460}
461
462/*
463 * Dequeue packets and send them over ATM. Note that we quite deliberately
464 * avoid checking net_device's flow control here, simply because sch_atm
465 * uses its own channels, which have nothing to do with any CLIP/LANE/or
466 * non-ATM interfaces.
467 */
468
469static void sch_atm_dequeue(unsigned long data)
470{
471	struct Qdisc *sch = (struct Qdisc *)data;
472	struct atm_qdisc_data *p = qdisc_priv(sch);
473	struct atm_flow_data *flow;
474	struct sk_buff *skb;
475
476	pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
477	list_for_each_entry(flow, &p->flows, list) {
478		if (flow == &p->link)
479			continue;
480		/*
481		 * If traffic is properly shaped, this won't generate nasty
482		 * little bursts. Otherwise, it may ... (but that's okay)
483		 */
484		while ((skb = flow->q->ops->peek(flow->q))) {
485			if (!atm_may_send(flow->vcc, skb->truesize))
486				break;
487
488			skb = qdisc_dequeue_peeked(flow->q);
489			if (unlikely(!skb))
490				break;
491
492			qdisc_bstats_update(sch, skb);
493			bstats_update(&flow->bstats, skb);
494			pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
495			/* remove any LL header somebody else has attached */
496			skb_pull(skb, skb_network_offset(skb));
497			if (skb_headroom(skb) < flow->hdr_len) {
498				struct sk_buff *new;
499
500				new = skb_realloc_headroom(skb, flow->hdr_len);
501				dev_kfree_skb(skb);
502				if (!new)
503					continue;
504				skb = new;
505			}
506			pr_debug("sch_atm_dequeue: ip %p, data %p\n",
507				 skb_network_header(skb), skb->data);
508			ATM_SKB(skb)->vcc = flow->vcc;
509			memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
510			       flow->hdr_len);
511			refcount_add(skb->truesize,
512				   &sk_atm(flow->vcc)->sk_wmem_alloc);
513			/* atm.atm_options are already set by atm_tc_enqueue */
514			flow->vcc->send(flow->vcc, skb);
515		}
516	}
517}
518
519static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
520{
521	struct atm_qdisc_data *p = qdisc_priv(sch);
522	struct sk_buff *skb;
523
524	pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
525	tasklet_schedule(&p->task);
526	skb = qdisc_dequeue_peeked(p->link.q);
527	if (skb)
528		sch->q.qlen--;
529	return skb;
530}
531
532static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
533{
534	struct atm_qdisc_data *p = qdisc_priv(sch);
535
536	pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
537
538	return p->link.q->ops->peek(p->link.q);
539}
540
541static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt,
542		       struct netlink_ext_ack *extack)
543{
544	struct atm_qdisc_data *p = qdisc_priv(sch);
545	int err;
546
547	pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
548	INIT_LIST_HEAD(&p->flows);
549	INIT_LIST_HEAD(&p->link.list);
550	list_add(&p->link.list, &p->flows);
551	p->link.q = qdisc_create_dflt(sch->dev_queue,
552				      &pfifo_qdisc_ops, sch->handle, extack);
553	if (!p->link.q)
554		p->link.q = &noop_qdisc;
555	pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
556
557	err = tcf_block_get(&p->link.block, &p->link.filter_list, sch,
558			    extack);
559	if (err)
560		return err;
561
562	p->link.vcc = NULL;
563	p->link.sock = NULL;
564	p->link.common.classid = sch->handle;
565	p->link.ref = 1;
566	tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
567	return 0;
568}
569
570static void atm_tc_reset(struct Qdisc *sch)
571{
572	struct atm_qdisc_data *p = qdisc_priv(sch);
573	struct atm_flow_data *flow;
574
575	pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
576	list_for_each_entry(flow, &p->flows, list)
577		qdisc_reset(flow->q);
578	sch->q.qlen = 0;
579}
580
581static void atm_tc_destroy(struct Qdisc *sch)
582{
583	struct atm_qdisc_data *p = qdisc_priv(sch);
584	struct atm_flow_data *flow, *tmp;
585
586	pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
587	list_for_each_entry(flow, &p->flows, list) {
588		tcf_block_put(flow->block);
589		flow->block = NULL;
590	}
591
592	list_for_each_entry_safe(flow, tmp, &p->flows, list) {
593		if (flow->ref > 1)
594			pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
595		atm_tc_put(sch, (unsigned long)flow);
596	}
597	tasklet_kill(&p->task);
598}
599
600static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
601			     struct sk_buff *skb, struct tcmsg *tcm)
602{
603	struct atm_qdisc_data *p = qdisc_priv(sch);
604	struct atm_flow_data *flow = (struct atm_flow_data *)cl;
605	struct nlattr *nest;
606
607	pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
608		sch, p, flow, skb, tcm);
609	if (list_empty(&flow->list))
610		return -EINVAL;
611	tcm->tcm_handle = flow->common.classid;
612	tcm->tcm_info = flow->q->handle;
613
614	nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
615	if (nest == NULL)
616		goto nla_put_failure;
617
618	if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
619		goto nla_put_failure;
620	if (flow->vcc) {
621		struct sockaddr_atmpvc pvc;
622		int state;
623
624		memset(&pvc, 0, sizeof(pvc));
625		pvc.sap_family = AF_ATMPVC;
626		pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
627		pvc.sap_addr.vpi = flow->vcc->vpi;
628		pvc.sap_addr.vci = flow->vcc->vci;
629		if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
630			goto nla_put_failure;
631		state = ATM_VF2VS(flow->vcc->flags);
632		if (nla_put_u32(skb, TCA_ATM_STATE, state))
633			goto nla_put_failure;
634	}
635	if (flow->excess) {
636		if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->common.classid))
637			goto nla_put_failure;
638	} else {
639		if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
640			goto nla_put_failure;
641	}
642	return nla_nest_end(skb, nest);
643
644nla_put_failure:
645	nla_nest_cancel(skb, nest);
646	return -1;
647}
648static int
649atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
650			struct gnet_dump *d)
651{
652	struct atm_flow_data *flow = (struct atm_flow_data *)arg;
653
654	if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
655				  d, NULL, &flow->bstats) < 0 ||
656	    gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
657		return -1;
658
659	return 0;
660}
661
662static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
663{
664	return 0;
665}
666
667static const struct Qdisc_class_ops atm_class_ops = {
668	.graft		= atm_tc_graft,
669	.leaf		= atm_tc_leaf,
670	.find		= atm_tc_find,
671	.change		= atm_tc_change,
672	.delete		= atm_tc_delete,
673	.walk		= atm_tc_walk,
674	.tcf_block	= atm_tc_tcf_block,
675	.bind_tcf	= atm_tc_bind_filter,
676	.unbind_tcf	= atm_tc_put,
677	.dump		= atm_tc_dump_class,
678	.dump_stats	= atm_tc_dump_class_stats,
679};
680
681static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
682	.cl_ops		= &atm_class_ops,
683	.id		= "atm",
684	.priv_size	= sizeof(struct atm_qdisc_data),
685	.enqueue	= atm_tc_enqueue,
686	.dequeue	= atm_tc_dequeue,
687	.peek		= atm_tc_peek,
688	.init		= atm_tc_init,
689	.reset		= atm_tc_reset,
690	.destroy	= atm_tc_destroy,
691	.dump		= atm_tc_dump,
692	.owner		= THIS_MODULE,
693};
694
695static int __init atm_init(void)
696{
697	return register_qdisc(&atm_qdisc_ops);
698}
699
700static void __exit atm_exit(void)
701{
702	unregister_qdisc(&atm_qdisc_ops);
703}
704
705module_init(atm_init)
706module_exit(atm_exit)
707MODULE_LICENSE("GPL");