sch_atm: Convert to use standard list_head facilities.
[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/string.h>
9 #include <linux/errno.h>
10 #include <linux/skbuff.h>
11 #include <linux/atmdev.h>
12 #include <linux/atmclip.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/file.h>         /* for fput */
15 #include <net/netlink.h>
16 #include <net/pkt_sched.h>
17
18 extern struct socket *sockfd_lookup(int fd, int *err);  /* @@@ fix this */
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
43 struct atm_flow_data {
44         struct Qdisc            *q;     /* FIFO, TBF, etc. */
45         struct tcf_proto        *filter_list;
46         struct atm_vcc          *vcc;   /* VCC; NULL if VCC is closed */
47         void                    (*old_pop)(struct atm_vcc *vcc,
48                                            struct sk_buff *skb); /* chaining */
49         struct atm_qdisc_data   *parent;        /* parent qdisc */
50         struct socket           *sock;          /* for closing */
51         u32                     classid;        /* x:y type ID */
52         int                     ref;            /* reference count */
53         struct gnet_stats_basic_packed  bstats;
54         struct gnet_stats_queue qstats;
55         struct list_head        list;
56         struct atm_flow_data    *excess;        /* flow for excess traffic;
57                                                    NULL to set CLP instead */
58         int                     hdr_len;
59         unsigned char           hdr[0];         /* header data; MUST BE LAST */
60 };
61
62 struct atm_qdisc_data {
63         struct atm_flow_data    link;           /* unclassified skbs go here */
64         struct list_head        flows;          /* NB: "link" is also on this
65                                                    list */
66         struct tasklet_struct   task;           /* dequeue tasklet */
67 };
68
69 /* ------------------------- Class/flow operations ------------------------- */
70
71 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
72 {
73         struct atm_qdisc_data *p = qdisc_priv(sch);
74         struct atm_flow_data *flow;
75
76         list_for_each_entry(flow, &p->flows, list) {
77                 if (flow->classid == classid)
78                         return flow;
79         }
80         return NULL;
81 }
82
83 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
84                         struct Qdisc *new, struct Qdisc **old)
85 {
86         struct atm_qdisc_data *p = qdisc_priv(sch);
87         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
88
89         pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
90                 sch, p, flow, new, old);
91         if (list_empty(&flow->list))
92                 return -EINVAL;
93         if (!new)
94                 new = &noop_qdisc;
95         *old = flow->q;
96         flow->q = new;
97         if (*old)
98                 qdisc_reset(*old);
99         return 0;
100 }
101
102 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
103 {
104         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
105
106         pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
107         return flow ? flow->q : NULL;
108 }
109
110 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
111 {
112         struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
113         struct atm_flow_data *flow;
114
115         pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
116         flow = lookup_flow(sch, classid);
117         if (flow)
118                 flow->ref++;
119         pr_debug("atm_tc_get: flow %p\n", flow);
120         return (unsigned long)flow;
121 }
122
123 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
124                                         unsigned long parent, u32 classid)
125 {
126         return atm_tc_get(sch, classid);
127 }
128
129 /*
130  * atm_tc_put handles all destructions, including the ones that are explicitly
131  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
132  * anything that still seems to be in use.
133  */
134 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
135 {
136         struct atm_qdisc_data *p = qdisc_priv(sch);
137         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
138
139         pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
140         if (--flow->ref)
141                 return;
142         pr_debug("atm_tc_put: destroying\n");
143         list_del_init(&flow->list);
144         pr_debug("atm_tc_put: qdisc %p\n", flow->q);
145         qdisc_destroy(flow->q);
146         tcf_destroy_chain(&flow->filter_list);
147         if (flow->sock) {
148                 pr_debug("atm_tc_put: f_count %ld\n",
149                         file_count(flow->sock->file));
150                 flow->vcc->pop = flow->old_pop;
151                 sockfd_put(flow->sock);
152         }
153         if (flow->excess)
154                 atm_tc_put(sch, (unsigned long)flow->excess);
155         if (flow != &p->link)
156                 kfree(flow);
157         /*
158          * If flow == &p->link, the qdisc no longer works at this point and
159          * needs to be removed. (By the caller of atm_tc_put.)
160          */
161 }
162
163 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
164 {
165         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
166
167         pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
168         VCC2FLOW(vcc)->old_pop(vcc, skb);
169         tasklet_schedule(&p->task);
170 }
171
172 static const u8 llc_oui_ip[] = {
173         0xaa,                   /* DSAP: non-ISO */
174         0xaa,                   /* SSAP: non-ISO */
175         0x03,                   /* Ctrl: Unnumbered Information Command PDU */
176         0x00,                   /* OUI: EtherType */
177         0x00, 0x00,
178         0x08, 0x00
179 };                              /* Ethertype IP (0800) */
180
181 static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
182         [TCA_ATM_FD]            = { .type = NLA_U32 },
183         [TCA_ATM_EXCESS]        = { .type = NLA_U32 },
184 };
185
186 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
187                          struct nlattr **tca, unsigned long *arg)
188 {
189         struct atm_qdisc_data *p = qdisc_priv(sch);
190         struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
191         struct atm_flow_data *excess = NULL;
192         struct nlattr *opt = tca[TCA_OPTIONS];
193         struct nlattr *tb[TCA_ATM_MAX + 1];
194         struct socket *sock;
195         int fd, error, hdr_len;
196         void *hdr;
197
198         pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
199                 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
200         /*
201          * The concept of parents doesn't apply for this qdisc.
202          */
203         if (parent && parent != TC_H_ROOT && parent != sch->handle)
204                 return -EINVAL;
205         /*
206          * ATM classes cannot be changed. In order to change properties of the
207          * ATM connection, that socket needs to be modified directly (via the
208          * native ATM API. In order to send a flow to a different VC, the old
209          * class needs to be removed and a new one added. (This may be changed
210          * later.)
211          */
212         if (flow)
213                 return -EBUSY;
214         if (opt == NULL)
215                 return -EINVAL;
216
217         error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
218         if (error < 0)
219                 return error;
220
221         if (!tb[TCA_ATM_FD])
222                 return -EINVAL;
223         fd = nla_get_u32(tb[TCA_ATM_FD]);
224         pr_debug("atm_tc_change: fd %d\n", fd);
225         if (tb[TCA_ATM_HDR]) {
226                 hdr_len = nla_len(tb[TCA_ATM_HDR]);
227                 hdr = nla_data(tb[TCA_ATM_HDR]);
228         } else {
229                 hdr_len = RFC1483LLC_LEN;
230                 hdr = NULL;     /* default LLC/SNAP for IP */
231         }
232         if (!tb[TCA_ATM_EXCESS])
233                 excess = NULL;
234         else {
235                 excess = (struct atm_flow_data *)
236                         atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
237                 if (!excess)
238                         return -ENOENT;
239         }
240         pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
241                  opt->nla_type, nla_len(opt), hdr_len);
242         sock = sockfd_lookup(fd, &error);
243         if (!sock)
244                 return error;   /* f_count++ */
245         pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
246         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
247                 error = -EPROTOTYPE;
248                 goto err_out;
249         }
250         /* @@@ should check if the socket is really operational or we'll crash
251            on vcc->send */
252         if (classid) {
253                 if (TC_H_MAJ(classid ^ sch->handle)) {
254                         pr_debug("atm_tc_change: classid mismatch\n");
255                         error = -EINVAL;
256                         goto err_out;
257                 }
258                 if (!list_empty(&flow->list)) {
259                         error = -EEXIST;
260                         goto err_out;
261                 }
262         } else {
263                 int i;
264                 unsigned long cl;
265
266                 for (i = 1; i < 0x8000; i++) {
267                         classid = TC_H_MAKE(sch->handle, 0x8000 | i);
268                         cl = atm_tc_get(sch, classid);
269                         if (!cl)
270                                 break;
271                         atm_tc_put(sch, cl);
272                 }
273         }
274         pr_debug("atm_tc_change: new id %x\n", classid);
275         flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
276         pr_debug("atm_tc_change: flow %p\n", flow);
277         if (!flow) {
278                 error = -ENOBUFS;
279                 goto err_out;
280         }
281         flow->filter_list = NULL;
282         flow->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
283                                     &pfifo_qdisc_ops, classid);
284         if (!flow->q)
285                 flow->q = &noop_qdisc;
286         pr_debug("atm_tc_change: qdisc %p\n", flow->q);
287         flow->sock = sock;
288         flow->vcc = ATM_SD(sock);       /* speedup */
289         flow->vcc->user_back = flow;
290         pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
291         flow->old_pop = flow->vcc->pop;
292         flow->parent = p;
293         flow->vcc->pop = sch_atm_pop;
294         flow->classid = classid;
295         flow->ref = 1;
296         flow->excess = excess;
297         list_add(&flow->list, &p->link.list);
298         flow->hdr_len = hdr_len;
299         if (hdr)
300                 memcpy(flow->hdr, hdr, hdr_len);
301         else
302                 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
303         *arg = (unsigned long)flow;
304         return 0;
305 err_out:
306         if (excess)
307                 atm_tc_put(sch, (unsigned long)excess);
308         sockfd_put(sock);
309         return error;
310 }
311
312 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
313 {
314         struct atm_qdisc_data *p = qdisc_priv(sch);
315         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
316
317         pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
318         if (list_empty(&flow->list))
319                 return -EINVAL;
320         if (flow->filter_list || flow == &p->link)
321                 return -EBUSY;
322         /*
323          * Reference count must be 2: one for "keepalive" (set at class
324          * creation), and one for the reference held when calling delete.
325          */
326         if (flow->ref < 2) {
327                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
328                 return -EINVAL;
329         }
330         if (flow->ref > 2)
331                 return -EBUSY;  /* catch references via excess, etc. */
332         atm_tc_put(sch, arg);
333         return 0;
334 }
335
336 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
337 {
338         struct atm_qdisc_data *p = qdisc_priv(sch);
339         struct atm_flow_data *flow;
340
341         pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
342         if (walker->stop)
343                 return;
344         list_for_each_entry(flow, &p->flows, list) {
345                 if (walker->count >= walker->skip &&
346                     walker->fn(sch, (unsigned long)flow, walker) < 0) {
347                         walker->stop = 1;
348                         break;
349                 }
350                 walker->count++;
351         }
352 }
353
354 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
355 {
356         struct atm_qdisc_data *p = qdisc_priv(sch);
357         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
358
359         pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
360         return flow ? &flow->filter_list : &p->link.filter_list;
361 }
362
363 /* --------------------------- Qdisc operations ---------------------------- */
364
365 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
366 {
367         struct atm_qdisc_data *p = qdisc_priv(sch);
368         struct atm_flow_data *flow;
369         struct tcf_result res;
370         int result;
371         int ret = NET_XMIT_POLICED;
372
373         pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
374         result = TC_POLICE_OK;  /* be nice to gcc */
375         flow = NULL;
376         if (TC_H_MAJ(skb->priority) != sch->handle ||
377             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
378                 list_for_each_entry(flow, &p->flows, list) {
379                         if (flow->filter_list) {
380                                 result = tc_classify_compat(skb,
381                                                             flow->filter_list,
382                                                             &res);
383                                 if (result < 0)
384                                         continue;
385                                 flow = (struct atm_flow_data *)res.class;
386                                 if (!flow)
387                                         flow = lookup_flow(sch, res.classid);
388                                 goto done;
389                         }
390                 }
391                 flow = NULL;
392         done:
393                 ;               
394         }
395         if (!flow)
396                 flow = &p->link;
397         else {
398                 if (flow->vcc)
399                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
400                 /*@@@ looks good ... but it's not supposed to work :-) */
401 #ifdef CONFIG_NET_CLS_ACT
402                 switch (result) {
403                 case TC_ACT_QUEUED:
404                 case TC_ACT_STOLEN:
405                         kfree_skb(skb);
406                         return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
407                 case TC_ACT_SHOT:
408                         kfree_skb(skb);
409                         goto drop;
410                 case TC_POLICE_RECLASSIFY:
411                         if (flow->excess)
412                                 flow = flow->excess;
413                         else
414                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
415                         break;
416                 }
417 #endif
418         }
419
420         ret = qdisc_enqueue(skb, flow->q);
421         if (ret != 0) {
422 drop: __maybe_unused
423                 if (net_xmit_drop_count(ret)) {
424                         sch->qstats.drops++;
425                         if (flow)
426                                 flow->qstats.drops++;
427                 }
428                 return ret;
429         }
430         sch->bstats.bytes += qdisc_pkt_len(skb);
431         sch->bstats.packets++;
432         flow->bstats.bytes += qdisc_pkt_len(skb);
433         flow->bstats.packets++;
434         /*
435          * Okay, this may seem weird. We pretend we've dropped the packet if
436          * it goes via ATM. The reason for this is that the outer qdisc
437          * expects to be able to q->dequeue the packet later on if we return
438          * success at this place. Also, sch->q.qdisc needs to reflect whether
439          * there is a packet egligible for dequeuing or not. Note that the
440          * statistics of the outer qdisc are necessarily wrong because of all
441          * this. There's currently no correct solution for this.
442          */
443         if (flow == &p->link) {
444                 sch->q.qlen++;
445                 return 0;
446         }
447         tasklet_schedule(&p->task);
448         return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
449 }
450
451 /*
452  * Dequeue packets and send them over ATM. Note that we quite deliberately
453  * avoid checking net_device's flow control here, simply because sch_atm
454  * uses its own channels, which have nothing to do with any CLIP/LANE/or
455  * non-ATM interfaces.
456  */
457
458 static void sch_atm_dequeue(unsigned long data)
459 {
460         struct Qdisc *sch = (struct Qdisc *)data;
461         struct atm_qdisc_data *p = qdisc_priv(sch);
462         struct atm_flow_data *flow;
463         struct sk_buff *skb;
464
465         pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
466         list_for_each_entry(flow, &p->flows, list) {
467                 if (flow == &p->link)
468                         continue;
469                 /*
470                  * If traffic is properly shaped, this won't generate nasty
471                  * little bursts. Otherwise, it may ... (but that's okay)
472                  */
473                 while ((skb = flow->q->ops->peek(flow->q))) {
474                         if (!atm_may_send(flow->vcc, skb->truesize))
475                                 break;
476
477                         skb = qdisc_dequeue_peeked(flow->q);
478                         if (unlikely(!skb))
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
506 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
507 {
508         struct atm_qdisc_data *p = qdisc_priv(sch);
509         struct sk_buff *skb;
510
511         pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
512         tasklet_schedule(&p->task);
513         skb = qdisc_dequeue_peeked(p->link.q);
514         if (skb)
515                 sch->q.qlen--;
516         return skb;
517 }
518
519 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
520 {
521         struct atm_qdisc_data *p = qdisc_priv(sch);
522
523         pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
524
525         return p->link.q->ops->peek(p->link.q);
526 }
527
528 static unsigned int atm_tc_drop(struct Qdisc *sch)
529 {
530         struct atm_qdisc_data *p = qdisc_priv(sch);
531         struct atm_flow_data *flow;
532         unsigned int len;
533
534         pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
535         list_for_each_entry(flow, &p->flows, list) {
536                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
537                         return len;
538         }
539         return 0;
540 }
541
542 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
543 {
544         struct atm_qdisc_data *p = qdisc_priv(sch);
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(qdisc_dev(sch), sch->dev_queue,
551                                       &pfifo_qdisc_ops, sch->handle);
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         p->link.filter_list = NULL;
556         p->link.vcc = NULL;
557         p->link.sock = NULL;
558         p->link.classid = sch->handle;
559         p->link.ref = 1;
560         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
561         return 0;
562 }
563
564 static void atm_tc_reset(struct Qdisc *sch)
565 {
566         struct atm_qdisc_data *p = qdisc_priv(sch);
567         struct atm_flow_data *flow;
568
569         pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
570         list_for_each_entry(flow, &p->flows, list)
571                 qdisc_reset(flow->q);
572         sch->q.qlen = 0;
573 }
574
575 static void atm_tc_destroy(struct Qdisc *sch)
576 {
577         struct atm_qdisc_data *p = qdisc_priv(sch);
578         struct atm_flow_data *flow, *tmp;
579
580         pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
581         list_for_each_entry(flow, &p->flows, list)
582                 tcf_destroy_chain(&flow->filter_list);
583
584         list_for_each_entry_safe(flow, tmp, &p->flows, list) {
585                 if (flow->ref > 1)
586                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
587                                flow->ref);
588                 atm_tc_put(sch, (unsigned long)flow);
589         }
590         tasklet_kill(&p->task);
591 }
592
593 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
594                              struct sk_buff *skb, struct tcmsg *tcm)
595 {
596         struct atm_qdisc_data *p = qdisc_priv(sch);
597         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
598         struct nlattr *nest;
599
600         pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
601                 sch, p, flow, skb, tcm);
602         if (list_empty(&flow->list))
603                 return -EINVAL;
604         tcm->tcm_handle = flow->classid;
605         tcm->tcm_info = flow->q->handle;
606
607         nest = nla_nest_start(skb, TCA_OPTIONS);
608         if (nest == NULL)
609                 goto nla_put_failure;
610
611         NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
612         if (flow->vcc) {
613                 struct sockaddr_atmpvc pvc;
614                 int state;
615
616                 pvc.sap_family = AF_ATMPVC;
617                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
618                 pvc.sap_addr.vpi = flow->vcc->vpi;
619                 pvc.sap_addr.vci = flow->vcc->vci;
620                 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
621                 state = ATM_VF2VS(flow->vcc->flags);
622                 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
623         }
624         if (flow->excess)
625                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
626         else {
627                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
628         }
629
630         nla_nest_end(skb, nest);
631         return skb->len;
632
633 nla_put_failure:
634         nla_nest_cancel(skb, nest);
635         return -1;
636 }
637 static int
638 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
639                         struct gnet_dump *d)
640 {
641         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
642
643         flow->qstats.qlen = flow->q->q.qlen;
644
645         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
646             gnet_stats_copy_queue(d, &flow->qstats) < 0)
647                 return -1;
648
649         return 0;
650 }
651
652 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
653 {
654         return 0;
655 }
656
657 static const struct Qdisc_class_ops atm_class_ops = {
658         .graft          = atm_tc_graft,
659         .leaf           = atm_tc_leaf,
660         .get            = atm_tc_get,
661         .put            = atm_tc_put,
662         .change         = atm_tc_change,
663         .delete         = atm_tc_delete,
664         .walk           = atm_tc_walk,
665         .tcf_chain      = atm_tc_find_tcf,
666         .bind_tcf       = atm_tc_bind_filter,
667         .unbind_tcf     = atm_tc_put,
668         .dump           = atm_tc_dump_class,
669         .dump_stats     = atm_tc_dump_class_stats,
670 };
671
672 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
673         .cl_ops         = &atm_class_ops,
674         .id             = "atm",
675         .priv_size      = sizeof(struct atm_qdisc_data),
676         .enqueue        = atm_tc_enqueue,
677         .dequeue        = atm_tc_dequeue,
678         .peek           = atm_tc_peek,
679         .drop           = atm_tc_drop,
680         .init           = atm_tc_init,
681         .reset          = atm_tc_reset,
682         .destroy        = atm_tc_destroy,
683         .dump           = atm_tc_dump,
684         .owner          = THIS_MODULE,
685 };
686
687 static int __init atm_init(void)
688 {
689         return register_qdisc(&atm_qdisc_ops);
690 }
691
692 static void __exit atm_exit(void)
693 {
694         unregister_qdisc(&atm_qdisc_ops);
695 }
696
697 module_init(atm_init)
698 module_exit(atm_exit)
699 MODULE_LICENSE("GPL");