[NET_SCHED]: Use nla_nest_start/nla_nest_end
[linux-2.6.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 int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
199                          struct nlattr **tca, unsigned long *arg)
200 {
201         struct atm_qdisc_data *p = qdisc_priv(sch);
202         struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
203         struct atm_flow_data *excess = NULL;
204         struct nlattr *opt = tca[TCA_OPTIONS];
205         struct nlattr *tb[TCA_ATM_MAX + 1];
206         struct socket *sock;
207         int fd, error, hdr_len;
208         void *hdr;
209
210         pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
211                 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
212         /*
213          * The concept of parents doesn't apply for this qdisc.
214          */
215         if (parent && parent != TC_H_ROOT && parent != sch->handle)
216                 return -EINVAL;
217         /*
218          * ATM classes cannot be changed. In order to change properties of the
219          * ATM connection, that socket needs to be modified directly (via the
220          * native ATM API. In order to send a flow to a different VC, the old
221          * class needs to be removed and a new one added. (This may be changed
222          * later.)
223          */
224         if (flow)
225                 return -EBUSY;
226         if (opt == NULL)
227                 return -EINVAL;
228         error = nla_parse_nested(tb, TCA_ATM_MAX, opt, NULL);
229         if (error < 0)
230                 return error;
231
232         if (!tb[TCA_ATM_FD] || nla_len(tb[TCA_ATM_FD]) < sizeof(fd))
233                 return -EINVAL;
234         fd = *(int *)nla_data(tb[TCA_ATM_FD]);
235         pr_debug("atm_tc_change: fd %d\n", fd);
236         if (tb[TCA_ATM_HDR]) {
237                 hdr_len = nla_len(tb[TCA_ATM_HDR]);
238                 hdr = nla_data(tb[TCA_ATM_HDR]);
239         } else {
240                 hdr_len = RFC1483LLC_LEN;
241                 hdr = NULL;     /* default LLC/SNAP for IP */
242         }
243         if (!tb[TCA_ATM_EXCESS])
244                 excess = NULL;
245         else {
246                 if (nla_len(tb[TCA_ATM_EXCESS]) != sizeof(u32))
247                         return -EINVAL;
248                 excess = (struct atm_flow_data *)
249                         atm_tc_get(sch, *(u32 *)nla_data(tb[TCA_ATM_EXCESS]));
250                 if (!excess)
251                         return -ENOENT;
252         }
253         pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
254                  opt->nla_type, nla_len(opt), hdr_len);
255         sock = sockfd_lookup(fd, &error);
256         if (!sock)
257                 return error;   /* f_count++ */
258         pr_debug("atm_tc_change: f_count %d\n", file_count(sock->file));
259         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
260                 error = -EPROTOTYPE;
261                 goto err_out;
262         }
263         /* @@@ should check if the socket is really operational or we'll crash
264            on vcc->send */
265         if (classid) {
266                 if (TC_H_MAJ(classid ^ sch->handle)) {
267                         pr_debug("atm_tc_change: classid mismatch\n");
268                         error = -EINVAL;
269                         goto err_out;
270                 }
271                 if (find_flow(p, flow)) {
272                         error = -EEXIST;
273                         goto err_out;
274                 }
275         } else {
276                 int i;
277                 unsigned long cl;
278
279                 for (i = 1; i < 0x8000; i++) {
280                         classid = TC_H_MAKE(sch->handle, 0x8000 | i);
281                         cl = atm_tc_get(sch, classid);
282                         if (!cl)
283                                 break;
284                         atm_tc_put(sch, cl);
285                 }
286         }
287         pr_debug("atm_tc_change: new id %x\n", classid);
288         flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
289         pr_debug("atm_tc_change: flow %p\n", flow);
290         if (!flow) {
291                 error = -ENOBUFS;
292                 goto err_out;
293         }
294         flow->filter_list = NULL;
295         flow->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid);
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->classid = classid;
307         flow->ref = 1;
308         flow->excess = excess;
309         flow->next = p->link.next;
310         p->link.next = flow;
311         flow->hdr_len = hdr_len;
312         if (hdr)
313                 memcpy(flow->hdr, hdr, hdr_len);
314         else
315                 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
316         *arg = (unsigned long)flow;
317         return 0;
318 err_out:
319         if (excess)
320                 atm_tc_put(sch, (unsigned long)excess);
321         sockfd_put(sock);
322         return error;
323 }
324
325 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
326 {
327         struct atm_qdisc_data *p = qdisc_priv(sch);
328         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
329
330         pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
331         if (!find_flow(qdisc_priv(sch), flow))
332                 return -EINVAL;
333         if (flow->filter_list || flow == &p->link)
334                 return -EBUSY;
335         /*
336          * Reference count must be 2: one for "keepalive" (set at class
337          * creation), and one for the reference held when calling delete.
338          */
339         if (flow->ref < 2) {
340                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
341                 return -EINVAL;
342         }
343         if (flow->ref > 2)
344                 return -EBUSY;  /* catch references via excess, etc. */
345         atm_tc_put(sch, arg);
346         return 0;
347 }
348
349 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
350 {
351         struct atm_qdisc_data *p = qdisc_priv(sch);
352         struct atm_flow_data *flow;
353
354         pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
355         if (walker->stop)
356                 return;
357         for (flow = p->flows; flow; flow = flow->next) {
358                 if (walker->count >= walker->skip)
359                         if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
360                                 walker->stop = 1;
361                                 break;
362                         }
363                 walker->count++;
364         }
365 }
366
367 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
368 {
369         struct atm_qdisc_data *p = qdisc_priv(sch);
370         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
371
372         pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
373         return flow ? &flow->filter_list : &p->link.filter_list;
374 }
375
376 /* --------------------------- Qdisc operations ---------------------------- */
377
378 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
379 {
380         struct atm_qdisc_data *p = qdisc_priv(sch);
381         struct atm_flow_data *flow = NULL;      /* @@@ */
382         struct tcf_result res;
383         int result;
384         int ret = NET_XMIT_POLICED;
385
386         pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
387         result = TC_POLICE_OK;  /* be nice to gcc */
388         if (TC_H_MAJ(skb->priority) != sch->handle ||
389             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
390                 for (flow = p->flows; flow; flow = flow->next)
391                         if (flow->filter_list) {
392                                 result = tc_classify_compat(skb,
393                                                             flow->filter_list,
394                                                             &res);
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                                 break;
401                         }
402         if (!flow)
403                 flow = &p->link;
404         else {
405                 if (flow->vcc)
406                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
407                 /*@@@ looks good ... but it's not supposed to work :-) */
408 #ifdef CONFIG_NET_CLS_ACT
409                 switch (result) {
410                 case TC_ACT_QUEUED:
411                 case TC_ACT_STOLEN:
412                         kfree_skb(skb);
413                         return NET_XMIT_SUCCESS;
414                 case TC_ACT_SHOT:
415                         kfree_skb(skb);
416                         goto drop;
417                 case TC_POLICE_RECLASSIFY:
418                         if (flow->excess)
419                                 flow = flow->excess;
420                         else
421                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
422                         break;
423                 }
424 #endif
425         }
426
427         ret = flow->q->enqueue(skb, flow->q);
428         if (ret != 0) {
429 drop: __maybe_unused
430                 sch->qstats.drops++;
431                 if (flow)
432                         flow->qstats.drops++;
433                 return ret;
434         }
435         sch->bstats.bytes += skb->len;
436         sch->bstats.packets++;
437         flow->bstats.bytes += skb->len;
438         flow->bstats.packets++;
439         /*
440          * Okay, this may seem weird. We pretend we've dropped the packet if
441          * it goes via ATM. The reason for this is that the outer qdisc
442          * expects to be able to q->dequeue the packet later on if we return
443          * success at this place. Also, sch->q.qdisc needs to reflect whether
444          * there is a packet egligible for dequeuing or not. Note that the
445          * statistics of the outer qdisc are necessarily wrong because of all
446          * this. There's currently no correct solution for this.
447          */
448         if (flow == &p->link) {
449                 sch->q.qlen++;
450                 return 0;
451         }
452         tasklet_schedule(&p->task);
453         return NET_XMIT_BYPASS;
454 }
455
456 /*
457  * Dequeue packets and send them over ATM. Note that we quite deliberately
458  * avoid checking net_device's flow control here, simply because sch_atm
459  * uses its own channels, which have nothing to do with any CLIP/LANE/or
460  * non-ATM interfaces.
461  */
462
463 static void sch_atm_dequeue(unsigned long data)
464 {
465         struct Qdisc *sch = (struct Qdisc *)data;
466         struct atm_qdisc_data *p = qdisc_priv(sch);
467         struct atm_flow_data *flow;
468         struct sk_buff *skb;
469
470         pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
471         for (flow = p->link.next; flow; flow = flow->next)
472                 /*
473                  * If traffic is properly shaped, this won't generate nasty
474                  * little bursts. Otherwise, it may ... (but that's okay)
475                  */
476                 while ((skb = flow->q->dequeue(flow->q))) {
477                         if (!atm_may_send(flow->vcc, skb->truesize)) {
478                                 (void)flow->q->ops->requeue(skb, flow->q);
479                                 break;
480                         }
481                         pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
482                         /* remove any LL header somebody else has attached */
483                         skb_pull(skb, skb_network_offset(skb));
484                         if (skb_headroom(skb) < flow->hdr_len) {
485                                 struct sk_buff *new;
486
487                                 new = skb_realloc_headroom(skb, flow->hdr_len);
488                                 dev_kfree_skb(skb);
489                                 if (!new)
490                                         continue;
491                                 skb = new;
492                         }
493                         pr_debug("sch_atm_dequeue: ip %p, data %p\n",
494                                  skb_network_header(skb), skb->data);
495                         ATM_SKB(skb)->vcc = flow->vcc;
496                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
497                                flow->hdr_len);
498                         atomic_add(skb->truesize,
499                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
500                         /* atm.atm_options are already set by atm_tc_enqueue */
501                         flow->vcc->send(flow->vcc, skb);
502                 }
503 }
504
505 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
506 {
507         struct atm_qdisc_data *p = qdisc_priv(sch);
508         struct sk_buff *skb;
509
510         pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
511         tasklet_schedule(&p->task);
512         skb = p->link.q->dequeue(p->link.q);
513         if (skb)
514                 sch->q.qlen--;
515         return skb;
516 }
517
518 static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
519 {
520         struct atm_qdisc_data *p = qdisc_priv(sch);
521         int ret;
522
523         pr_debug("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
524         ret = p->link.q->ops->requeue(skb, p->link.q);
525         if (!ret) {
526                 sch->q.qlen++;
527                 sch->qstats.requeues++;
528         } else {
529                 sch->qstats.drops++;
530                 p->link.qstats.drops++;
531         }
532         return ret;
533 }
534
535 static unsigned int atm_tc_drop(struct Qdisc *sch)
536 {
537         struct atm_qdisc_data *p = qdisc_priv(sch);
538         struct atm_flow_data *flow;
539         unsigned int len;
540
541         pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
542         for (flow = p->flows; flow; flow = flow->next)
543                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
544                         return len;
545         return 0;
546 }
547
548 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
549 {
550         struct atm_qdisc_data *p = qdisc_priv(sch);
551
552         pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
553         p->flows = &p->link;
554         p->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
555         if (!p->link.q)
556                 p->link.q = &noop_qdisc;
557         pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
558         p->link.filter_list = NULL;
559         p->link.vcc = NULL;
560         p->link.sock = NULL;
561         p->link.classid = sch->handle;
562         p->link.ref = 1;
563         p->link.next = NULL;
564         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
565         return 0;
566 }
567
568 static 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         for (flow = p->flows; flow; flow = flow->next)
575                 qdisc_reset(flow->q);
576         sch->q.qlen = 0;
577 }
578
579 static void atm_tc_destroy(struct Qdisc *sch)
580 {
581         struct atm_qdisc_data *p = qdisc_priv(sch);
582         struct atm_flow_data *flow;
583
584         pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
585         /* races ? */
586         while ((flow = p->flows)) {
587                 tcf_destroy_chain(flow->filter_list);
588                 flow->filter_list = NULL;
589                 if (flow->ref > 1)
590                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
591                                flow->ref);
592                 atm_tc_put(sch, (unsigned long)flow);
593                 if (p->flows == flow) {
594                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
595                                "kill it\n", flow);
596                         p->flows = flow->next;  /* brute force */
597                         break;
598                 }
599         }
600         tasklet_kill(&p->task);
601 }
602
603 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
604                              struct sk_buff *skb, struct tcmsg *tcm)
605 {
606         struct atm_qdisc_data *p = qdisc_priv(sch);
607         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
608         struct nlattr *nest;
609
610         pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
611                 sch, p, flow, skb, tcm);
612         if (!find_flow(p, flow))
613                 return -EINVAL;
614         tcm->tcm_handle = flow->classid;
615         tcm->tcm_info = flow->q->handle;
616
617         nest = nla_nest_start(skb, TCA_OPTIONS);
618         if (nest == NULL)
619                 goto nla_put_failure;
620
621         NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
622         if (flow->vcc) {
623                 struct sockaddr_atmpvc pvc;
624                 int state;
625
626                 pvc.sap_family = AF_ATMPVC;
627                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
628                 pvc.sap_addr.vpi = flow->vcc->vpi;
629                 pvc.sap_addr.vci = flow->vcc->vci;
630                 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
631                 state = ATM_VF2VS(flow->vcc->flags);
632                 NLA_PUT(skb, TCA_ATM_STATE, sizeof(state), &state);
633         }
634         if (flow->excess)
635                 NLA_PUT(skb, TCA_ATM_EXCESS, sizeof(u32), &flow->classid);
636         else {
637                 static u32 zero;
638
639                 NLA_PUT(skb, TCA_ATM_EXCESS, sizeof(zero), &zero);
640         }
641
642         nla_nest_end(skb, nest);
643         return skb->len;
644
645 nla_put_failure:
646         nla_nest_cancel(skb, nest);
647         return -1;
648 }
649 static int
650 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
651                         struct gnet_dump *d)
652 {
653         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
654
655         flow->qstats.qlen = flow->q->q.qlen;
656
657         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
658             gnet_stats_copy_queue(d, &flow->qstats) < 0)
659                 return -1;
660
661         return 0;
662 }
663
664 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
665 {
666         return 0;
667 }
668
669 static const struct Qdisc_class_ops atm_class_ops = {
670         .graft          = atm_tc_graft,
671         .leaf           = atm_tc_leaf,
672         .get            = atm_tc_get,
673         .put            = atm_tc_put,
674         .change         = atm_tc_change,
675         .delete         = atm_tc_delete,
676         .walk           = atm_tc_walk,
677         .tcf_chain      = atm_tc_find_tcf,
678         .bind_tcf       = atm_tc_bind_filter,
679         .unbind_tcf     = atm_tc_put,
680         .dump           = atm_tc_dump_class,
681         .dump_stats     = atm_tc_dump_class_stats,
682 };
683
684 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
685         .cl_ops         = &atm_class_ops,
686         .id             = "atm",
687         .priv_size      = sizeof(struct atm_qdisc_data),
688         .enqueue        = atm_tc_enqueue,
689         .dequeue        = atm_tc_dequeue,
690         .requeue        = atm_tc_requeue,
691         .drop           = atm_tc_drop,
692         .init           = atm_tc_init,
693         .reset          = atm_tc_reset,
694         .destroy        = atm_tc_destroy,
695         .dump           = atm_tc_dump,
696         .owner          = THIS_MODULE,
697 };
698
699 static int __init atm_init(void)
700 {
701         return register_qdisc(&atm_qdisc_ops);
702 }
703
704 static void __exit atm_exit(void)
705 {
706         unregister_qdisc(&atm_qdisc_ops);
707 }
708
709 module_init(atm_init)
710 module_exit(atm_exit)
711 MODULE_LICENSE("GPL");