net-sched: fix filter destruction in atm/hfsc qdisc destruction
[linux-3.10.git] / net / sched / sch_atm.c
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/init.h>
7 #include <linux/string.h>
8 #include <linux/errno.h>
9 #include <linux/skbuff.h>
10 #include <linux/atmdev.h>
11 #include <linux/atmclip.h>
12 #include <linux/rtnetlink.h>
13 #include <linux/file.h>         /* for fput */
14 #include <net/netlink.h>
15 #include <net/pkt_sched.h>
16
17 extern struct socket *sockfd_lookup(int fd, int *err);  /* @@@ fix this */
18
19 /*
20  * The ATM queuing discipline provides a framework for invoking classifiers
21  * (aka "filters"), which in turn select classes of this queuing discipline.
22  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
23  * may share the same VC.
24  *
25  * When creating a class, VCs are specified by passing the number of the open
26  * socket descriptor by which the calling process references the VC. The kernel
27  * keeps the VC open at least until all classes using it are removed.
28  *
29  * In this file, most functions are named atm_tc_* to avoid confusion with all
30  * the atm_* in net/atm. This naming convention differs from what's used in the
31  * rest of net/sched.
32  *
33  * Known bugs:
34  *  - sometimes messes up the IP stack
35  *  - any manipulations besides the few operations described in the README, are
36  *    untested and likely to crash the system
37  *  - should lock the flow while there is data in the queue (?)
38  */
39
40 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
41
42 struct atm_flow_data {
43         struct Qdisc            *q;     /* FIFO, TBF, etc. */
44         struct tcf_proto        *filter_list;
45         struct atm_vcc          *vcc;   /* VCC; NULL if VCC is closed */
46         void                    (*old_pop)(struct atm_vcc *vcc,
47                                            struct sk_buff *skb); /* chaining */
48         struct atm_qdisc_data   *parent;        /* parent qdisc */
49         struct socket           *sock;          /* for closing */
50         u32                     classid;        /* x:y type ID */
51         int                     ref;            /* reference count */
52         struct gnet_stats_basic bstats;
53         struct gnet_stats_queue qstats;
54         struct atm_flow_data    *next;
55         struct atm_flow_data    *excess;        /* flow for excess traffic;
56                                                    NULL to set CLP instead */
57         int                     hdr_len;
58         unsigned char           hdr[0];         /* header data; MUST BE LAST */
59 };
60
61 struct atm_qdisc_data {
62         struct atm_flow_data    link;           /* unclassified skbs go here */
63         struct atm_flow_data    *flows;         /* NB: "link" is also on this
64                                                    list */
65         struct tasklet_struct   task;           /* requeue tasklet */
66 };
67
68 /* ------------------------- Class/flow operations ------------------------- */
69
70 static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
71 {
72         struct atm_flow_data *walk;
73
74         pr_debug("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
75         for (walk = qdisc->flows; walk; walk = walk->next)
76                 if (walk == flow)
77                         return 1;
78         pr_debug("find_flow: not found\n");
79         return 0;
80 }
81
82 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
83 {
84         struct atm_qdisc_data *p = qdisc_priv(sch);
85         struct atm_flow_data *flow;
86
87         for (flow = p->flows; flow; flow = flow->next)
88                 if (flow->classid == classid)
89                         break;
90         return flow;
91 }
92
93 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
94                         struct Qdisc *new, struct Qdisc **old)
95 {
96         struct atm_qdisc_data *p = qdisc_priv(sch);
97         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
98
99         pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
100                 sch, p, flow, new, old);
101         if (!find_flow(p, flow))
102                 return -EINVAL;
103         if (!new)
104                 new = &noop_qdisc;
105         *old = xchg(&flow->q, new);
106         if (*old)
107                 qdisc_reset(*old);
108         return 0;
109 }
110
111 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
112 {
113         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
114
115         pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
116         return flow ? flow->q : NULL;
117 }
118
119 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
120 {
121         struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
122         struct atm_flow_data *flow;
123
124         pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
125         flow = lookup_flow(sch, classid);
126         if (flow)
127                 flow->ref++;
128         pr_debug("atm_tc_get: flow %p\n", flow);
129         return (unsigned long)flow;
130 }
131
132 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
133                                         unsigned long parent, u32 classid)
134 {
135         return atm_tc_get(sch, classid);
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  */
143 static 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         struct atm_flow_data **prev;
148
149         pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
150         if (--flow->ref)
151                 return;
152         pr_debug("atm_tc_put: destroying\n");
153         for (prev = &p->flows; *prev; prev = &(*prev)->next)
154                 if (*prev == flow)
155                         break;
156         if (!*prev) {
157                 printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
158                 return;
159         }
160         *prev = flow->next;
161         pr_debug("atm_tc_put: qdisc %p\n", flow->q);
162         qdisc_destroy(flow->q);
163         tcf_destroy_chain(&flow->filter_list);
164         if (flow->sock) {
165                 pr_debug("atm_tc_put: f_count %d\n",
166                         file_count(flow->sock->file));
167                 flow->vcc->pop = flow->old_pop;
168                 sockfd_put(flow->sock);
169         }
170         if (flow->excess)
171                 atm_tc_put(sch, (unsigned long)flow->excess);
172         if (flow != &p->link)
173                 kfree(flow);
174         /*
175          * If flow == &p->link, the qdisc no longer works at this point and
176          * needs to be removed. (By the caller of atm_tc_put.)
177          */
178 }
179
180 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
181 {
182         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
183
184         pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
185         VCC2FLOW(vcc)->old_pop(vcc, skb);
186         tasklet_schedule(&p->task);
187 }
188
189 static const u8 llc_oui_ip[] = {
190         0xaa,                   /* DSAP: non-ISO */
191         0xaa,                   /* SSAP: non-ISO */
192         0x03,                   /* Ctrl: Unnumbered Information Command PDU */
193         0x00,                   /* OUI: EtherType */
194         0x00, 0x00,
195         0x08, 0x00
196 };                              /* Ethertype IP (0800) */
197
198 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
199         [TCA_ATM_FD]            = { .type = NLA_U32 },
200         [TCA_ATM_EXCESS]        = { .type = NLA_U32 },
201 };
202
203 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
204                          struct nlattr **tca, unsigned long *arg)
205 {
206         struct atm_qdisc_data *p = qdisc_priv(sch);
207         struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
208         struct atm_flow_data *excess = NULL;
209         struct nlattr *opt = tca[TCA_OPTIONS];
210         struct nlattr *tb[TCA_ATM_MAX + 1];
211         struct socket *sock;
212         int fd, error, hdr_len;
213         void *hdr;
214
215         pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
216                 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
217         /*
218          * The concept of parents doesn't apply for this qdisc.
219          */
220         if (parent && parent != TC_H_ROOT && parent != sch->handle)
221                 return -EINVAL;
222         /*
223          * ATM classes cannot be changed. In order to change properties of the
224          * ATM connection, that socket needs to be modified directly (via the
225          * native ATM API. In order to send a flow to a different VC, the old
226          * class needs to be removed and a new one added. (This may be changed
227          * later.)
228          */
229         if (flow)
230                 return -EBUSY;
231         if (opt == NULL)
232                 return -EINVAL;
233
234         error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
235         if (error < 0)
236                 return error;
237
238         if (!tb[TCA_ATM_FD])
239                 return -EINVAL;
240         fd = nla_get_u32(tb[TCA_ATM_FD]);
241         pr_debug("atm_tc_change: fd %d\n", fd);
242         if (tb[TCA_ATM_HDR]) {
243                 hdr_len = nla_len(tb[TCA_ATM_HDR]);
244                 hdr = nla_data(tb[TCA_ATM_HDR]);
245         } else {
246                 hdr_len = RFC1483LLC_LEN;
247                 hdr = NULL;     /* default LLC/SNAP for IP */
248         }
249         if (!tb[TCA_ATM_EXCESS])
250                 excess = NULL;
251         else {
252                 excess = (struct atm_flow_data *)
253                         atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
254                 if (!excess)
255                         return -ENOENT;
256         }
257         pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
258                  opt->nla_type, nla_len(opt), hdr_len);
259         sock = sockfd_lookup(fd, &error);
260         if (!sock)
261                 return error;   /* f_count++ */
262         pr_debug("atm_tc_change: f_count %d\n", file_count(sock->file));
263         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
264                 error = -EPROTOTYPE;
265                 goto err_out;
266         }
267         /* @@@ should check if the socket is really operational or we'll crash
268            on vcc->send */
269         if (classid) {
270                 if (TC_H_MAJ(classid ^ sch->handle)) {
271                         pr_debug("atm_tc_change: classid mismatch\n");
272                         error = -EINVAL;
273                         goto err_out;
274                 }
275                 if (find_flow(p, flow)) {
276                         error = -EEXIST;
277                         goto err_out;
278                 }
279         } else {
280                 int i;
281                 unsigned long cl;
282
283                 for (i = 1; i < 0x8000; i++) {
284                         classid = TC_H_MAKE(sch->handle, 0x8000 | i);
285                         cl = atm_tc_get(sch, classid);
286                         if (!cl)
287                                 break;
288                         atm_tc_put(sch, cl);
289                 }
290         }
291         pr_debug("atm_tc_change: new id %x\n", classid);
292         flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
293         pr_debug("atm_tc_change: flow %p\n", flow);
294         if (!flow) {
295                 error = -ENOBUFS;
296                 goto err_out;
297         }
298         flow->filter_list = NULL;
299         flow->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid);
300         if (!flow->q)
301                 flow->q = &noop_qdisc;
302         pr_debug("atm_tc_change: qdisc %p\n", flow->q);
303         flow->sock = sock;
304         flow->vcc = ATM_SD(sock);       /* speedup */
305         flow->vcc->user_back = flow;
306         pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
307         flow->old_pop = flow->vcc->pop;
308         flow->parent = p;
309         flow->vcc->pop = sch_atm_pop;
310         flow->classid = classid;
311         flow->ref = 1;
312         flow->excess = excess;
313         flow->next = p->link.next;
314         p->link.next = flow;
315         flow->hdr_len = hdr_len;
316         if (hdr)
317                 memcpy(flow->hdr, hdr, hdr_len);
318         else
319                 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
320         *arg = (unsigned long)flow;
321         return 0;
322 err_out:
323         if (excess)
324                 atm_tc_put(sch, (unsigned long)excess);
325         sockfd_put(sock);
326         return error;
327 }
328
329 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
330 {
331         struct atm_qdisc_data *p = qdisc_priv(sch);
332         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
333
334         pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
335         if (!find_flow(qdisc_priv(sch), flow))
336                 return -EINVAL;
337         if (flow->filter_list || flow == &p->link)
338                 return -EBUSY;
339         /*
340          * Reference count must be 2: one for "keepalive" (set at class
341          * creation), and one for the reference held when calling delete.
342          */
343         if (flow->ref < 2) {
344                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
345                 return -EINVAL;
346         }
347         if (flow->ref > 2)
348                 return -EBUSY;  /* catch references via excess, etc. */
349         atm_tc_put(sch, arg);
350         return 0;
351 }
352
353 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
354 {
355         struct atm_qdisc_data *p = qdisc_priv(sch);
356         struct atm_flow_data *flow;
357
358         pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
359         if (walker->stop)
360                 return;
361         for (flow = p->flows; flow; flow = flow->next) {
362                 if (walker->count >= walker->skip)
363                         if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
364                                 walker->stop = 1;
365                                 break;
366                         }
367                 walker->count++;
368         }
369 }
370
371 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
372 {
373         struct atm_qdisc_data *p = qdisc_priv(sch);
374         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
375
376         pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
377         return flow ? &flow->filter_list : &p->link.filter_list;
378 }
379
380 /* --------------------------- Qdisc operations ---------------------------- */
381
382 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
383 {
384         struct atm_qdisc_data *p = qdisc_priv(sch);
385         struct atm_flow_data *flow = NULL;      /* @@@ */
386         struct tcf_result res;
387         int result;
388         int ret = NET_XMIT_POLICED;
389
390         pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
391         result = TC_POLICE_OK;  /* be nice to gcc */
392         if (TC_H_MAJ(skb->priority) != sch->handle ||
393             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
394                 for (flow = p->flows; flow; flow = flow->next)
395                         if (flow->filter_list) {
396                                 result = tc_classify_compat(skb,
397                                                             flow->filter_list,
398                                                             &res);
399                                 if (result < 0)
400                                         continue;
401                                 flow = (struct atm_flow_data *)res.class;
402                                 if (!flow)
403                                         flow = lookup_flow(sch, res.classid);
404                                 break;
405                         }
406         if (!flow)
407                 flow = &p->link;
408         else {
409                 if (flow->vcc)
410                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
411                 /*@@@ looks good ... but it's not supposed to work :-) */
412 #ifdef CONFIG_NET_CLS_ACT
413                 switch (result) {
414                 case TC_ACT_QUEUED:
415                 case TC_ACT_STOLEN:
416                         kfree_skb(skb);
417                         return NET_XMIT_SUCCESS;
418                 case TC_ACT_SHOT:
419                         kfree_skb(skb);
420                         goto drop;
421                 case TC_POLICE_RECLASSIFY:
422                         if (flow->excess)
423                                 flow = flow->excess;
424                         else
425                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
426                         break;
427                 }
428 #endif
429         }
430
431         ret = flow->q->enqueue(skb, flow->q);
432         if (ret != 0) {
433 drop: __maybe_unused
434                 sch->qstats.drops++;
435                 if (flow)
436                         flow->qstats.drops++;
437                 return ret;
438         }
439         sch->bstats.bytes += skb->len;
440         sch->bstats.packets++;
441         flow->bstats.bytes += skb->len;
442         flow->bstats.packets++;
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 0;
455         }
456         tasklet_schedule(&p->task);
457         return 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
467 static 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         for (flow = p->link.next; flow; flow = flow->next)
476                 /*
477                  * If traffic is properly shaped, this won't generate nasty
478                  * little bursts. Otherwise, it may ... (but that's okay)
479                  */
480                 while ((skb = flow->q->dequeue(flow->q))) {
481                         if (!atm_may_send(flow->vcc, skb->truesize)) {
482                                 (void)flow->q->ops->requeue(skb, flow->q);
483                                 break;
484                         }
485                         pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
486                         /* remove any LL header somebody else has attached */
487                         skb_pull(skb, skb_network_offset(skb));
488                         if (skb_headroom(skb) < flow->hdr_len) {
489                                 struct sk_buff *new;
490
491                                 new = skb_realloc_headroom(skb, flow->hdr_len);
492                                 dev_kfree_skb(skb);
493                                 if (!new)
494                                         continue;
495                                 skb = new;
496                         }
497                         pr_debug("sch_atm_dequeue: ip %p, data %p\n",
498                                  skb_network_header(skb), skb->data);
499                         ATM_SKB(skb)->vcc = flow->vcc;
500                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
501                                flow->hdr_len);
502                         atomic_add(skb->truesize,
503                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
504                         /* atm.atm_options are already set by atm_tc_enqueue */
505                         flow->vcc->send(flow->vcc, skb);
506                 }
507 }
508
509 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
510 {
511         struct atm_qdisc_data *p = qdisc_priv(sch);
512         struct sk_buff *skb;
513
514         pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
515         tasklet_schedule(&p->task);
516         skb = p->link.q->dequeue(p->link.q);
517         if (skb)
518                 sch->q.qlen--;
519         return skb;
520 }
521
522 static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
523 {
524         struct atm_qdisc_data *p = qdisc_priv(sch);
525         int ret;
526
527         pr_debug("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
528         ret = p->link.q->ops->requeue(skb, p->link.q);
529         if (!ret) {
530                 sch->q.qlen++;
531                 sch->qstats.requeues++;
532         } else {
533                 sch->qstats.drops++;
534                 p->link.qstats.drops++;
535         }
536         return ret;
537 }
538
539 static unsigned int atm_tc_drop(struct Qdisc *sch)
540 {
541         struct atm_qdisc_data *p = qdisc_priv(sch);
542         struct atm_flow_data *flow;
543         unsigned int len;
544
545         pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
546         for (flow = p->flows; flow; flow = flow->next)
547                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
548                         return len;
549         return 0;
550 }
551
552 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
553 {
554         struct atm_qdisc_data *p = qdisc_priv(sch);
555
556         pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
557         p->flows = &p->link;
558         p->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
559         if (!p->link.q)
560                 p->link.q = &noop_qdisc;
561         pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
562         p->link.filter_list = NULL;
563         p->link.vcc = NULL;
564         p->link.sock = NULL;
565         p->link.classid = sch->handle;
566         p->link.ref = 1;
567         p->link.next = NULL;
568         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
569         return 0;
570 }
571
572 static void atm_tc_reset(struct Qdisc *sch)
573 {
574         struct atm_qdisc_data *p = qdisc_priv(sch);
575         struct atm_flow_data *flow;
576
577         pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
578         for (flow = p->flows; flow; flow = flow->next)
579                 qdisc_reset(flow->q);
580         sch->q.qlen = 0;
581 }
582
583 static void atm_tc_destroy(struct Qdisc *sch)
584 {
585         struct atm_qdisc_data *p = qdisc_priv(sch);
586         struct atm_flow_data *flow;
587
588         pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
589         for (flow = p->flows; flow; flow = flow->next)
590                 tcf_destroy_chain(&flow->filter_list);
591
592         /* races ? */
593         while ((flow = p->flows)) {
594                 if (flow->ref > 1)
595                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
596                                flow->ref);
597                 atm_tc_put(sch, (unsigned long)flow);
598                 if (p->flows == flow) {
599                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
600                                "kill it\n", flow);
601                         p->flows = flow->next;  /* brute force */
602                         break;
603                 }
604         }
605         tasklet_kill(&p->task);
606 }
607
608 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
609                              struct sk_buff *skb, struct tcmsg *tcm)
610 {
611         struct atm_qdisc_data *p = qdisc_priv(sch);
612         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
613         struct nlattr *nest;
614
615         pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
616                 sch, p, flow, skb, tcm);
617         if (!find_flow(p, flow))
618                 return -EINVAL;
619         tcm->tcm_handle = flow->classid;
620         tcm->tcm_info = flow->q->handle;
621
622         nest = nla_nest_start(skb, TCA_OPTIONS);
623         if (nest == NULL)
624                 goto nla_put_failure;
625
626         NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
627         if (flow->vcc) {
628                 struct sockaddr_atmpvc pvc;
629                 int state;
630
631                 pvc.sap_family = AF_ATMPVC;
632                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
633                 pvc.sap_addr.vpi = flow->vcc->vpi;
634                 pvc.sap_addr.vci = flow->vcc->vci;
635                 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
636                 state = ATM_VF2VS(flow->vcc->flags);
637                 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
638         }
639         if (flow->excess)
640                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
641         else {
642                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
643         }
644
645         nla_nest_end(skb, nest);
646         return skb->len;
647
648 nla_put_failure:
649         nla_nest_cancel(skb, nest);
650         return -1;
651 }
652 static int
653 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
654                         struct gnet_dump *d)
655 {
656         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
657
658         flow->qstats.qlen = flow->q->q.qlen;
659
660         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
661             gnet_stats_copy_queue(d, &flow->qstats) < 0)
662                 return -1;
663
664         return 0;
665 }
666
667 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
668 {
669         return 0;
670 }
671
672 static const struct Qdisc_class_ops atm_class_ops = {
673         .graft          = atm_tc_graft,
674         .leaf           = atm_tc_leaf,
675         .get            = atm_tc_get,
676         .put            = atm_tc_put,
677         .change         = atm_tc_change,
678         .delete         = atm_tc_delete,
679         .walk           = atm_tc_walk,
680         .tcf_chain      = atm_tc_find_tcf,
681         .bind_tcf       = atm_tc_bind_filter,
682         .unbind_tcf     = atm_tc_put,
683         .dump           = atm_tc_dump_class,
684         .dump_stats     = atm_tc_dump_class_stats,
685 };
686
687 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
688         .cl_ops         = &atm_class_ops,
689         .id             = "atm",
690         .priv_size      = sizeof(struct atm_qdisc_data),
691         .enqueue        = atm_tc_enqueue,
692         .dequeue        = atm_tc_dequeue,
693         .requeue        = atm_tc_requeue,
694         .drop           = atm_tc_drop,
695         .init           = atm_tc_init,
696         .reset          = atm_tc_reset,
697         .destroy        = atm_tc_destroy,
698         .dump           = atm_tc_dump,
699         .owner          = THIS_MODULE,
700 };
701
702 static int __init atm_init(void)
703 {
704         return register_qdisc(&atm_qdisc_ops);
705 }
706
707 static void __exit atm_exit(void)
708 {
709         unregister_qdisc(&atm_qdisc_ops);
710 }
711
712 module_init(atm_init)
713 module_exit(atm_exit)
714 MODULE_LICENSE("GPL");