ca8e0a57d945dabeb51147f338cef363672040d5
[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/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
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_packed  bstats;
53         struct gnet_stats_queue qstats;
54         struct list_head        list;
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 list_head        flows;          /* NB: "link" is also on this
64                                                    list */
65         struct tasklet_struct   task;           /* dequeue tasklet */
66 };
67
68 /* ------------------------- Class/flow operations ------------------------- */
69
70 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
71 {
72         struct atm_qdisc_data *p = qdisc_priv(sch);
73         struct atm_flow_data *flow;
74
75         list_for_each_entry(flow, &p->flows, list) {
76                 if (flow->classid == classid)
77                         return flow;
78         }
79         return NULL;
80 }
81
82 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
83                         struct Qdisc *new, struct Qdisc **old)
84 {
85         struct atm_qdisc_data *p = qdisc_priv(sch);
86         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
87
88         pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
89                 sch, p, flow, new, old);
90         if (list_empty(&flow->list))
91                 return -EINVAL;
92         if (!new)
93                 new = &noop_qdisc;
94         *old = flow->q;
95         flow->q = new;
96         if (*old)
97                 qdisc_reset(*old);
98         return 0;
99 }
100
101 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
102 {
103         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
104
105         pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
106         return flow ? flow->q : NULL;
107 }
108
109 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
110 {
111         struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
112         struct atm_flow_data *flow;
113
114         pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
115         flow = lookup_flow(sch, classid);
116         if (flow)
117                 flow->ref++;
118         pr_debug("atm_tc_get: flow %p\n", flow);
119         return (unsigned long)flow;
120 }
121
122 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
123                                         unsigned long parent, u32 classid)
124 {
125         return atm_tc_get(sch, classid);
126 }
127
128 /*
129  * atm_tc_put handles all destructions, including the ones that are explicitly
130  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
131  * anything that still seems to be in use.
132  */
133 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
134 {
135         struct atm_qdisc_data *p = qdisc_priv(sch);
136         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
137
138         pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
139         if (--flow->ref)
140                 return;
141         pr_debug("atm_tc_put: destroying\n");
142         list_del_init(&flow->list);
143         pr_debug("atm_tc_put: qdisc %p\n", flow->q);
144         qdisc_destroy(flow->q);
145         tcf_destroy_chain(&flow->filter_list);
146         if (flow->sock) {
147                 pr_debug("atm_tc_put: f_count %ld\n",
148                         file_count(flow->sock->file));
149                 flow->vcc->pop = flow->old_pop;
150                 sockfd_put(flow->sock);
151         }
152         if (flow->excess)
153                 atm_tc_put(sch, (unsigned long)flow->excess);
154         if (flow != &p->link)
155                 kfree(flow);
156         /*
157          * If flow == &p->link, the qdisc no longer works at this point and
158          * needs to be removed. (By the caller of atm_tc_put.)
159          */
160 }
161
162 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
163 {
164         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
165
166         pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
167         VCC2FLOW(vcc)->old_pop(vcc, skb);
168         tasklet_schedule(&p->task);
169 }
170
171 static const u8 llc_oui_ip[] = {
172         0xaa,                   /* DSAP: non-ISO */
173         0xaa,                   /* SSAP: non-ISO */
174         0x03,                   /* Ctrl: Unnumbered Information Command PDU */
175         0x00,                   /* OUI: EtherType */
176         0x00, 0x00,
177         0x08, 0x00
178 };                              /* Ethertype IP (0800) */
179
180 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
181         [TCA_ATM_FD]            = { .type = NLA_U32 },
182         [TCA_ATM_EXCESS]        = { .type = NLA_U32 },
183 };
184
185 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
186                          struct nlattr **tca, unsigned long *arg)
187 {
188         struct atm_qdisc_data *p = qdisc_priv(sch);
189         struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
190         struct atm_flow_data *excess = NULL;
191         struct nlattr *opt = tca[TCA_OPTIONS];
192         struct nlattr *tb[TCA_ATM_MAX + 1];
193         struct socket *sock;
194         int fd, error, hdr_len;
195         void *hdr;
196
197         pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
198                 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
199         /*
200          * The concept of parents doesn't apply for this qdisc.
201          */
202         if (parent && parent != TC_H_ROOT && parent != sch->handle)
203                 return -EINVAL;
204         /*
205          * ATM classes cannot be changed. In order to change properties of the
206          * ATM connection, that socket needs to be modified directly (via the
207          * native ATM API. In order to send a flow to a different VC, the old
208          * class needs to be removed and a new one added. (This may be changed
209          * later.)
210          */
211         if (flow)
212                 return -EBUSY;
213         if (opt == NULL)
214                 return -EINVAL;
215
216         error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
217         if (error < 0)
218                 return error;
219
220         if (!tb[TCA_ATM_FD])
221                 return -EINVAL;
222         fd = nla_get_u32(tb[TCA_ATM_FD]);
223         pr_debug("atm_tc_change: fd %d\n", fd);
224         if (tb[TCA_ATM_HDR]) {
225                 hdr_len = nla_len(tb[TCA_ATM_HDR]);
226                 hdr = nla_data(tb[TCA_ATM_HDR]);
227         } else {
228                 hdr_len = RFC1483LLC_LEN;
229                 hdr = NULL;     /* default LLC/SNAP for IP */
230         }
231         if (!tb[TCA_ATM_EXCESS])
232                 excess = NULL;
233         else {
234                 excess = (struct atm_flow_data *)
235                         atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
236                 if (!excess)
237                         return -ENOENT;
238         }
239         pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
240                  opt->nla_type, nla_len(opt), hdr_len);
241         sock = sockfd_lookup(fd, &error);
242         if (!sock)
243                 return error;   /* f_count++ */
244         pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
245         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
246                 error = -EPROTOTYPE;
247                 goto err_out;
248         }
249         /* @@@ should check if the socket is really operational or we'll crash
250            on vcc->send */
251         if (classid) {
252                 if (TC_H_MAJ(classid ^ sch->handle)) {
253                         pr_debug("atm_tc_change: classid mismatch\n");
254                         error = -EINVAL;
255                         goto err_out;
256                 }
257         } else {
258                 int i;
259                 unsigned long cl;
260
261                 for (i = 1; i < 0x8000; i++) {
262                         classid = TC_H_MAKE(sch->handle, 0x8000 | i);
263                         cl = atm_tc_get(sch, classid);
264                         if (!cl)
265                                 break;
266                         atm_tc_put(sch, cl);
267                 }
268         }
269         pr_debug("atm_tc_change: new id %x\n", classid);
270         flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
271         pr_debug("atm_tc_change: flow %p\n", flow);
272         if (!flow) {
273                 error = -ENOBUFS;
274                 goto err_out;
275         }
276         flow->filter_list = NULL;
277         flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
278         if (!flow->q)
279                 flow->q = &noop_qdisc;
280         pr_debug("atm_tc_change: qdisc %p\n", flow->q);
281         flow->sock = sock;
282         flow->vcc = ATM_SD(sock);       /* speedup */
283         flow->vcc->user_back = flow;
284         pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
285         flow->old_pop = flow->vcc->pop;
286         flow->parent = p;
287         flow->vcc->pop = sch_atm_pop;
288         flow->classid = classid;
289         flow->ref = 1;
290         flow->excess = excess;
291         list_add(&flow->list, &p->link.list);
292         flow->hdr_len = hdr_len;
293         if (hdr)
294                 memcpy(flow->hdr, hdr, hdr_len);
295         else
296                 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
297         *arg = (unsigned long)flow;
298         return 0;
299 err_out:
300         if (excess)
301                 atm_tc_put(sch, (unsigned long)excess);
302         sockfd_put(sock);
303         return error;
304 }
305
306 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
307 {
308         struct atm_qdisc_data *p = qdisc_priv(sch);
309         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
310
311         pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
312         if (list_empty(&flow->list))
313                 return -EINVAL;
314         if (flow->filter_list || flow == &p->link)
315                 return -EBUSY;
316         /*
317          * Reference count must be 2: one for "keepalive" (set at class
318          * creation), and one for the reference held when calling delete.
319          */
320         if (flow->ref < 2) {
321                 pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
322                 return -EINVAL;
323         }
324         if (flow->ref > 2)
325                 return -EBUSY;  /* catch references via excess, etc. */
326         atm_tc_put(sch, arg);
327         return 0;
328 }
329
330 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
331 {
332         struct atm_qdisc_data *p = qdisc_priv(sch);
333         struct atm_flow_data *flow;
334
335         pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
336         if (walker->stop)
337                 return;
338         list_for_each_entry(flow, &p->flows, list) {
339                 if (walker->count >= walker->skip &&
340                     walker->fn(sch, (unsigned long)flow, walker) < 0) {
341                         walker->stop = 1;
342                         break;
343                 }
344                 walker->count++;
345         }
346 }
347
348 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
349 {
350         struct atm_qdisc_data *p = qdisc_priv(sch);
351         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
352
353         pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
354         return flow ? &flow->filter_list : &p->link.filter_list;
355 }
356
357 /* --------------------------- Qdisc operations ---------------------------- */
358
359 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
360 {
361         struct atm_qdisc_data *p = qdisc_priv(sch);
362         struct atm_flow_data *flow;
363         struct tcf_result res;
364         int result;
365         int ret = NET_XMIT_POLICED;
366
367         pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
368         result = TC_POLICE_OK;  /* be nice to gcc */
369         flow = NULL;
370         if (TC_H_MAJ(skb->priority) != sch->handle ||
371             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
372                 list_for_each_entry(flow, &p->flows, list) {
373                         if (flow->filter_list) {
374                                 result = tc_classify_compat(skb,
375                                                             flow->filter_list,
376                                                             &res);
377                                 if (result < 0)
378                                         continue;
379                                 flow = (struct atm_flow_data *)res.class;
380                                 if (!flow)
381                                         flow = lookup_flow(sch, res.classid);
382                                 goto done;
383                         }
384                 }
385                 flow = NULL;
386 done:
387                 ;
388         }
389         if (!flow) {
390                 flow = &p->link;
391         } else {
392                 if (flow->vcc)
393                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
394                 /*@@@ looks good ... but it's not supposed to work :-) */
395 #ifdef CONFIG_NET_CLS_ACT
396                 switch (result) {
397                 case TC_ACT_QUEUED:
398                 case TC_ACT_STOLEN:
399                         kfree_skb(skb);
400                         return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
401                 case TC_ACT_SHOT:
402                         kfree_skb(skb);
403                         goto drop;
404                 case TC_POLICE_RECLASSIFY:
405                         if (flow->excess)
406                                 flow = flow->excess;
407                         else
408                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
409                         break;
410                 }
411 #endif
412         }
413
414         ret = qdisc_enqueue(skb, flow->q);
415         if (ret != NET_XMIT_SUCCESS) {
416 drop: __maybe_unused
417                 if (net_xmit_drop_count(ret)) {
418                         sch->qstats.drops++;
419                         if (flow)
420                                 flow->qstats.drops++;
421                 }
422                 return ret;
423         }
424         /*
425          * Okay, this may seem weird. We pretend we've dropped the packet if
426          * it goes via ATM. The reason for this is that the outer qdisc
427          * expects to be able to q->dequeue the packet later on if we return
428          * success at this place. Also, sch->q.qdisc needs to reflect whether
429          * there is a packet egligible for dequeuing or not. Note that the
430          * statistics of the outer qdisc are necessarily wrong because of all
431          * this. There's currently no correct solution for this.
432          */
433         if (flow == &p->link) {
434                 sch->q.qlen++;
435                 return NET_XMIT_SUCCESS;
436         }
437         tasklet_schedule(&p->task);
438         return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
439 }
440
441 /*
442  * Dequeue packets and send them over ATM. Note that we quite deliberately
443  * avoid checking net_device's flow control here, simply because sch_atm
444  * uses its own channels, which have nothing to do with any CLIP/LANE/or
445  * non-ATM interfaces.
446  */
447
448 static void sch_atm_dequeue(unsigned long data)
449 {
450         struct Qdisc *sch = (struct Qdisc *)data;
451         struct atm_qdisc_data *p = qdisc_priv(sch);
452         struct atm_flow_data *flow;
453         struct sk_buff *skb;
454
455         pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
456         list_for_each_entry(flow, &p->flows, list) {
457                 if (flow == &p->link)
458                         continue;
459                 /*
460                  * If traffic is properly shaped, this won't generate nasty
461                  * little bursts. Otherwise, it may ... (but that's okay)
462                  */
463                 while ((skb = flow->q->ops->peek(flow->q))) {
464                         if (!atm_may_send(flow->vcc, skb->truesize))
465                                 break;
466
467                         skb = qdisc_dequeue_peeked(flow->q);
468                         if (unlikely(!skb))
469                                 break;
470
471                         qdisc_bstats_update(sch, skb);
472                         bstats_update(&flow->bstats, skb);
473                         pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
474                         /* remove any LL header somebody else has attached */
475                         skb_pull(skb, skb_network_offset(skb));
476                         if (skb_headroom(skb) < flow->hdr_len) {
477                                 struct sk_buff *new;
478
479                                 new = skb_realloc_headroom(skb, flow->hdr_len);
480                                 dev_kfree_skb(skb);
481                                 if (!new)
482                                         continue;
483                                 skb = new;
484                         }
485                         pr_debug("sch_atm_dequeue: ip %p, data %p\n",
486                                  skb_network_header(skb), skb->data);
487                         ATM_SKB(skb)->vcc = flow->vcc;
488                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
489                                flow->hdr_len);
490                         atomic_add(skb->truesize,
491                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
492                         /* atm.atm_options are already set by atm_tc_enqueue */
493                         flow->vcc->send(flow->vcc, skb);
494                 }
495         }
496 }
497
498 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
499 {
500         struct atm_qdisc_data *p = qdisc_priv(sch);
501         struct sk_buff *skb;
502
503         pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
504         tasklet_schedule(&p->task);
505         skb = qdisc_dequeue_peeked(p->link.q);
506         if (skb)
507                 sch->q.qlen--;
508         return skb;
509 }
510
511 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
512 {
513         struct atm_qdisc_data *p = qdisc_priv(sch);
514
515         pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
516
517         return p->link.q->ops->peek(p->link.q);
518 }
519
520 static unsigned int atm_tc_drop(struct Qdisc *sch)
521 {
522         struct atm_qdisc_data *p = qdisc_priv(sch);
523         struct atm_flow_data *flow;
524         unsigned int len;
525
526         pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
527         list_for_each_entry(flow, &p->flows, list) {
528                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
529                         return len;
530         }
531         return 0;
532 }
533
534 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
535 {
536         struct atm_qdisc_data *p = qdisc_priv(sch);
537
538         pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
539         INIT_LIST_HEAD(&p->flows);
540         INIT_LIST_HEAD(&p->link.list);
541         list_add(&p->link.list, &p->flows);
542         p->link.q = qdisc_create_dflt(sch->dev_queue,
543                                       &pfifo_qdisc_ops, sch->handle);
544         if (!p->link.q)
545                 p->link.q = &noop_qdisc;
546         pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
547         p->link.filter_list = NULL;
548         p->link.vcc = NULL;
549         p->link.sock = NULL;
550         p->link.classid = sch->handle;
551         p->link.ref = 1;
552         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
553         return 0;
554 }
555
556 static void atm_tc_reset(struct Qdisc *sch)
557 {
558         struct atm_qdisc_data *p = qdisc_priv(sch);
559         struct atm_flow_data *flow;
560
561         pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
562         list_for_each_entry(flow, &p->flows, list)
563                 qdisc_reset(flow->q);
564         sch->q.qlen = 0;
565 }
566
567 static void atm_tc_destroy(struct Qdisc *sch)
568 {
569         struct atm_qdisc_data *p = qdisc_priv(sch);
570         struct atm_flow_data *flow, *tmp;
571
572         pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
573         list_for_each_entry(flow, &p->flows, list)
574                 tcf_destroy_chain(&flow->filter_list);
575
576         list_for_each_entry_safe(flow, tmp, &p->flows, list) {
577                 if (flow->ref > 1)
578                         pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
579                 atm_tc_put(sch, (unsigned long)flow);
580         }
581         tasklet_kill(&p->task);
582 }
583
584 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
585                              struct sk_buff *skb, struct tcmsg *tcm)
586 {
587         struct atm_qdisc_data *p = qdisc_priv(sch);
588         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
589         struct nlattr *nest;
590
591         pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
592                 sch, p, flow, skb, tcm);
593         if (list_empty(&flow->list))
594                 return -EINVAL;
595         tcm->tcm_handle = flow->classid;
596         tcm->tcm_info = flow->q->handle;
597
598         nest = nla_nest_start(skb, TCA_OPTIONS);
599         if (nest == NULL)
600                 goto nla_put_failure;
601
602         if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
603                 goto nla_put_failure;
604         if (flow->vcc) {
605                 struct sockaddr_atmpvc pvc;
606                 int state;
607
608                 pvc.sap_family = AF_ATMPVC;
609                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
610                 pvc.sap_addr.vpi = flow->vcc->vpi;
611                 pvc.sap_addr.vci = flow->vcc->vci;
612                 if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
613                         goto nla_put_failure;
614                 state = ATM_VF2VS(flow->vcc->flags);
615                 if (nla_put_u32(skb, TCA_ATM_STATE, state))
616                         goto nla_put_failure;
617         }
618         if (flow->excess) {
619                 if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->classid))
620                         goto nla_put_failure;
621         } else {
622                 if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
623                         goto nla_put_failure;
624         }
625         nla_nest_end(skb, nest);
626         return skb->len;
627
628 nla_put_failure:
629         nla_nest_cancel(skb, nest);
630         return -1;
631 }
632 static int
633 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
634                         struct gnet_dump *d)
635 {
636         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
637
638         flow->qstats.qlen = flow->q->q.qlen;
639
640         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
641             gnet_stats_copy_queue(d, &flow->qstats) < 0)
642                 return -1;
643
644         return 0;
645 }
646
647 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
648 {
649         return 0;
650 }
651
652 static const struct Qdisc_class_ops atm_class_ops = {
653         .graft          = atm_tc_graft,
654         .leaf           = atm_tc_leaf,
655         .get            = atm_tc_get,
656         .put            = atm_tc_put,
657         .change         = atm_tc_change,
658         .delete         = atm_tc_delete,
659         .walk           = atm_tc_walk,
660         .tcf_chain      = atm_tc_find_tcf,
661         .bind_tcf       = atm_tc_bind_filter,
662         .unbind_tcf     = atm_tc_put,
663         .dump           = atm_tc_dump_class,
664         .dump_stats     = atm_tc_dump_class_stats,
665 };
666
667 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
668         .cl_ops         = &atm_class_ops,
669         .id             = "atm",
670         .priv_size      = sizeof(struct atm_qdisc_data),
671         .enqueue        = atm_tc_enqueue,
672         .dequeue        = atm_tc_dequeue,
673         .peek           = atm_tc_peek,
674         .drop           = atm_tc_drop,
675         .init           = atm_tc_init,
676         .reset          = atm_tc_reset,
677         .destroy        = atm_tc_destroy,
678         .dump           = atm_tc_dump,
679         .owner          = THIS_MODULE,
680 };
681
682 static int __init atm_init(void)
683 {
684         return register_qdisc(&atm_qdisc_ops);
685 }
686
687 static void __exit atm_exit(void)
688 {
689         unregister_qdisc(&atm_qdisc_ops);
690 }
691
692 module_init(atm_init)
693 module_exit(atm_exit)
694 MODULE_LICENSE("GPL");