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Linux kernel mirror (for testing)
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linux
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_put(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_deprecated(tb, TCA_ATM_MAX, opt, atm_policy,
227 NULL);
228 if (error < 0)
229 return error;
230
231 if (!tb[TCA_ATM_FD])
232 return -EINVAL;
233 fd = nla_get_u32(tb[TCA_ATM_FD]);
234 pr_debug("atm_tc_change: fd %d\n", fd);
235 if (tb[TCA_ATM_HDR]) {
236 hdr_len = nla_len(tb[TCA_ATM_HDR]);
237 hdr = nla_data(tb[TCA_ATM_HDR]);
238 } else {
239 hdr_len = RFC1483LLC_LEN;
240 hdr = NULL; /* default LLC/SNAP for IP */
241 }
242 if (!tb[TCA_ATM_EXCESS])
243 excess = NULL;
244 else {
245 excess = (struct atm_flow_data *)
246 atm_tc_find(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
247 if (!excess)
248 return -ENOENT;
249 }
250 pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
251 opt->nla_type, nla_len(opt), hdr_len);
252 sock = sockfd_lookup(fd, &error);
253 if (!sock)
254 return error; /* f_count++ */
255 pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
256 if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
257 error = -EPROTOTYPE;
258 goto err_out;
259 }
260 /* @@@ should check if the socket is really operational or we'll crash
261 on vcc->send */
262 if (classid) {
263 if (TC_H_MAJ(classid ^ sch->handle)) {
264 pr_debug("atm_tc_change: classid mismatch\n");
265 error = -EINVAL;
266 goto err_out;
267 }
268 } else {
269 int i;
270 unsigned long cl;
271
272 for (i = 1; i < 0x8000; i++) {
273 classid = TC_H_MAKE(sch->handle, 0x8000 | i);
274 cl = atm_tc_find(sch, classid);
275 if (!cl)
276 break;
277 }
278 }
279 pr_debug("atm_tc_change: new id %x\n", classid);
280 flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
281 pr_debug("atm_tc_change: flow %p\n", flow);
282 if (!flow) {
283 error = -ENOBUFS;
284 goto err_out;
285 }
286
287 error = tcf_block_get(&flow->block, &flow->filter_list, sch,
288 extack);
289 if (error) {
290 kfree(flow);
291 goto err_out;
292 }
293
294 flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid,
295 extack);
296 if (!flow->q)
297 flow->q = &noop_qdisc;
298 pr_debug("atm_tc_change: qdisc %p\n", flow->q);
299 flow->sock = sock;
300 flow->vcc = ATM_SD(sock); /* speedup */
301 flow->vcc->user_back = flow;
302 pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
303 flow->old_pop = flow->vcc->pop;
304 flow->parent = p;
305 flow->vcc->pop = sch_atm_pop;
306 flow->common.classid = classid;
307 flow->ref = 1;
308 flow->excess = excess;
309 list_add(&flow->list, &p->link.list);
310 flow->hdr_len = hdr_len;
311 if (hdr)
312 memcpy(flow->hdr, hdr, hdr_len);
313 else
314 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
315 *arg = (unsigned long)flow;
316 return 0;
317err_out:
318 sockfd_put(sock);
319 return error;
320}
321
322static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
323{
324 struct atm_qdisc_data *p = qdisc_priv(sch);
325 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
326
327 pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
328 if (list_empty(&flow->list))
329 return -EINVAL;
330 if (rcu_access_pointer(flow->filter_list) || flow == &p->link)
331 return -EBUSY;
332 /*
333 * Reference count must be 2: one for "keepalive" (set at class
334 * creation), and one for the reference held when calling delete.
335 */
336 if (flow->ref < 2) {
337 pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
338 return -EINVAL;
339 }
340 if (flow->ref > 2)
341 return -EBUSY; /* catch references via excess, etc. */
342 atm_tc_put(sch, arg);
343 return 0;
344}
345
346static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
347{
348 struct atm_qdisc_data *p = qdisc_priv(sch);
349 struct atm_flow_data *flow;
350
351 pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
352 if (walker->stop)
353 return;
354 list_for_each_entry(flow, &p->flows, list) {
355 if (walker->count >= walker->skip &&
356 walker->fn(sch, (unsigned long)flow, walker) < 0) {
357 walker->stop = 1;
358 break;
359 }
360 walker->count++;
361 }
362}
363
364static struct tcf_block *atm_tc_tcf_block(struct Qdisc *sch, unsigned long cl,
365 struct netlink_ext_ack *extack)
366{
367 struct atm_qdisc_data *p = qdisc_priv(sch);
368 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
369
370 pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
371 return flow ? flow->block : p->link.block;
372}
373
374/* --------------------------- Qdisc operations ---------------------------- */
375
376static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
377 struct sk_buff **to_free)
378{
379 struct atm_qdisc_data *p = qdisc_priv(sch);
380 struct atm_flow_data *flow;
381 struct tcf_result res;
382 int result;
383 int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
384
385 pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
386 result = TC_ACT_OK; /* be nice to gcc */
387 flow = NULL;
388 if (TC_H_MAJ(skb->priority) != sch->handle ||
389 !(flow = (struct atm_flow_data *)atm_tc_find(sch, skb->priority))) {
390 struct tcf_proto *fl;
391
392 list_for_each_entry(flow, &p->flows, list) {
393 fl = rcu_dereference_bh(flow->filter_list);
394 if (fl) {
395 result = tcf_classify(skb, fl, &res, true);
396 if (result < 0)
397 continue;
398 flow = (struct atm_flow_data *)res.class;
399 if (!flow)
400 flow = lookup_flow(sch, res.classid);
401 goto done;
402 }
403 }
404 flow = NULL;
405done:
406 ;
407 }
408 if (!flow) {
409 flow = &p->link;
410 } else {
411 if (flow->vcc)
412 ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
413 /*@@@ looks good ... but it's not supposed to work :-) */
414#ifdef CONFIG_NET_CLS_ACT
415 switch (result) {
416 case TC_ACT_QUEUED:
417 case TC_ACT_STOLEN:
418 case TC_ACT_TRAP:
419 __qdisc_drop(skb, to_free);
420 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
421 case TC_ACT_SHOT:
422 __qdisc_drop(skb, to_free);
423 goto drop;
424 case TC_ACT_RECLASSIFY:
425 if (flow->excess)
426 flow = flow->excess;
427 else
428 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
429 break;
430 }
431#endif
432 }
433
434 ret = qdisc_enqueue(skb, flow->q, to_free);
435 if (ret != NET_XMIT_SUCCESS) {
436drop: __maybe_unused
437 if (net_xmit_drop_count(ret)) {
438 qdisc_qstats_drop(sch);
439 if (flow)
440 flow->qstats.drops++;
441 }
442 return ret;
443 }
444 /*
445 * Okay, this may seem weird. We pretend we've dropped the packet if
446 * it goes via ATM. The reason for this is that the outer qdisc
447 * expects to be able to q->dequeue the packet later on if we return
448 * success at this place. Also, sch->q.qdisc needs to reflect whether
449 * there is a packet egligible for dequeuing or not. Note that the
450 * statistics of the outer qdisc are necessarily wrong because of all
451 * this. There's currently no correct solution for this.
452 */
453 if (flow == &p->link) {
454 sch->q.qlen++;
455 return NET_XMIT_SUCCESS;
456 }
457 tasklet_schedule(&p->task);
458 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
459}
460
461/*
462 * Dequeue packets and send them over ATM. Note that we quite deliberately
463 * avoid checking net_device's flow control here, simply because sch_atm
464 * uses its own channels, which have nothing to do with any CLIP/LANE/or
465 * non-ATM interfaces.
466 */
467
468static void sch_atm_dequeue(unsigned long data)
469{
470 struct Qdisc *sch = (struct Qdisc *)data;
471 struct atm_qdisc_data *p = qdisc_priv(sch);
472 struct atm_flow_data *flow;
473 struct sk_buff *skb;
474
475 pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
476 list_for_each_entry(flow, &p->flows, list) {
477 if (flow == &p->link)
478 continue;
479 /*
480 * If traffic is properly shaped, this won't generate nasty
481 * little bursts. Otherwise, it may ... (but that's okay)
482 */
483 while ((skb = flow->q->ops->peek(flow->q))) {
484 if (!atm_may_send(flow->vcc, skb->truesize))
485 break;
486
487 skb = qdisc_dequeue_peeked(flow->q);
488 if (unlikely(!skb))
489 break;
490
491 qdisc_bstats_update(sch, skb);
492 bstats_update(&flow->bstats, skb);
493 pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
494 /* remove any LL header somebody else has attached */
495 skb_pull(skb, skb_network_offset(skb));
496 if (skb_headroom(skb) < flow->hdr_len) {
497 struct sk_buff *new;
498
499 new = skb_realloc_headroom(skb, flow->hdr_len);
500 dev_kfree_skb(skb);
501 if (!new)
502 continue;
503 skb = new;
504 }
505 pr_debug("sch_atm_dequeue: ip %p, data %p\n",
506 skb_network_header(skb), skb->data);
507 ATM_SKB(skb)->vcc = flow->vcc;
508 memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
509 flow->hdr_len);
510 refcount_add(skb->truesize,
511 &sk_atm(flow->vcc)->sk_wmem_alloc);
512 /* atm.atm_options are already set by atm_tc_enqueue */
513 flow->vcc->send(flow->vcc, skb);
514 }
515 }
516}
517
518static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
519{
520 struct atm_qdisc_data *p = qdisc_priv(sch);
521 struct sk_buff *skb;
522
523 pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
524 tasklet_schedule(&p->task);
525 skb = qdisc_dequeue_peeked(p->link.q);
526 if (skb)
527 sch->q.qlen--;
528 return skb;
529}
530
531static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
532{
533 struct atm_qdisc_data *p = qdisc_priv(sch);
534
535 pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
536
537 return p->link.q->ops->peek(p->link.q);
538}
539
540static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt,
541 struct netlink_ext_ack *extack)
542{
543 struct atm_qdisc_data *p = qdisc_priv(sch);
544 int err;
545
546 pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
547 INIT_LIST_HEAD(&p->flows);
548 INIT_LIST_HEAD(&p->link.list);
549 list_add(&p->link.list, &p->flows);
550 p->link.q = qdisc_create_dflt(sch->dev_queue,
551 &pfifo_qdisc_ops, sch->handle, extack);
552 if (!p->link.q)
553 p->link.q = &noop_qdisc;
554 pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
555
556 err = tcf_block_get(&p->link.block, &p->link.filter_list, sch,
557 extack);
558 if (err)
559 return err;
560
561 p->link.vcc = NULL;
562 p->link.sock = NULL;
563 p->link.common.classid = sch->handle;
564 p->link.ref = 1;
565 tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
566 return 0;
567}
568
569static void atm_tc_reset(struct Qdisc *sch)
570{
571 struct atm_qdisc_data *p = qdisc_priv(sch);
572 struct atm_flow_data *flow;
573
574 pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
575 list_for_each_entry(flow, &p->flows, list)
576 qdisc_reset(flow->q);
577 sch->q.qlen = 0;
578}
579
580static void atm_tc_destroy(struct Qdisc *sch)
581{
582 struct atm_qdisc_data *p = qdisc_priv(sch);
583 struct atm_flow_data *flow, *tmp;
584
585 pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
586 list_for_each_entry(flow, &p->flows, list) {
587 tcf_block_put(flow->block);
588 flow->block = NULL;
589 }
590
591 list_for_each_entry_safe(flow, tmp, &p->flows, list) {
592 if (flow->ref > 1)
593 pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
594 atm_tc_put(sch, (unsigned long)flow);
595 }
596 tasklet_kill(&p->task);
597}
598
599static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
600 struct sk_buff *skb, struct tcmsg *tcm)
601{
602 struct atm_qdisc_data *p = qdisc_priv(sch);
603 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
604 struct nlattr *nest;
605
606 pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
607 sch, p, flow, skb, tcm);
608 if (list_empty(&flow->list))
609 return -EINVAL;
610 tcm->tcm_handle = flow->common.classid;
611 tcm->tcm_info = flow->q->handle;
612
613 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
614 if (nest == NULL)
615 goto nla_put_failure;
616
617 if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
618 goto nla_put_failure;
619 if (flow->vcc) {
620 struct sockaddr_atmpvc pvc;
621 int state;
622
623 memset(&pvc, 0, sizeof(pvc));
624 pvc.sap_family = AF_ATMPVC;
625 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
626 pvc.sap_addr.vpi = flow->vcc->vpi;
627 pvc.sap_addr.vci = flow->vcc->vci;
628 if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
629 goto nla_put_failure;
630 state = ATM_VF2VS(flow->vcc->flags);
631 if (nla_put_u32(skb, TCA_ATM_STATE, state))
632 goto nla_put_failure;
633 }
634 if (flow->excess) {
635 if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->common.classid))
636 goto nla_put_failure;
637 } else {
638 if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
639 goto nla_put_failure;
640 }
641 return nla_nest_end(skb, nest);
642
643nla_put_failure:
644 nla_nest_cancel(skb, nest);
645 return -1;
646}
647static int
648atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
649 struct gnet_dump *d)
650{
651 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
652
653 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
654 d, NULL, &flow->bstats) < 0 ||
655 gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
656 return -1;
657
658 return 0;
659}
660
661static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
662{
663 return 0;
664}
665
666static const struct Qdisc_class_ops atm_class_ops = {
667 .graft = atm_tc_graft,
668 .leaf = atm_tc_leaf,
669 .find = atm_tc_find,
670 .change = atm_tc_change,
671 .delete = atm_tc_delete,
672 .walk = atm_tc_walk,
673 .tcf_block = atm_tc_tcf_block,
674 .bind_tcf = atm_tc_bind_filter,
675 .unbind_tcf = atm_tc_put,
676 .dump = atm_tc_dump_class,
677 .dump_stats = atm_tc_dump_class_stats,
678};
679
680static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
681 .cl_ops = &atm_class_ops,
682 .id = "atm",
683 .priv_size = sizeof(struct atm_qdisc_data),
684 .enqueue = atm_tc_enqueue,
685 .dequeue = atm_tc_dequeue,
686 .peek = atm_tc_peek,
687 .init = atm_tc_init,
688 .reset = atm_tc_reset,
689 .destroy = atm_tc_destroy,
690 .dump = atm_tc_dump,
691 .owner = THIS_MODULE,
692};
693
694static int __init atm_init(void)
695{
696 return register_qdisc(&atm_qdisc_ops);
697}
698
699static void __exit atm_exit(void)
700{
701 unregister_qdisc(&atm_qdisc_ops);
702}
703
704module_init(atm_init)
705module_exit(atm_exit)
706MODULE_LICENSE("GPL");