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