[NETLINK]: Use nlmsg_trim() where appropriate
[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
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/string.h>
9 #include <linux/errno.h>
10 #include <linux/skbuff.h>
11 #include <linux/interrupt.h>
12 #include <linux/atmdev.h>
13 #include <linux/atmclip.h>
14 #include <linux/netdevice.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/file.h> /* for fput */
17 #include <net/netlink.h>
18 #include <net/pkt_sched.h>
19 #include <net/sock.h>
20
21
22 extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
23
24 #if 0 /* control */
25 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
26 #else
27 #define DPRINTK(format,args...)
28 #endif
29
30 #if 0 /* data */
31 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
32 #else
33 #define D2PRINTK(format,args...)
34 #endif
35
36
37 /*
38  * The ATM queuing discipline provides a framework for invoking classifiers
39  * (aka "filters"), which in turn select classes of this queuing discipline.
40  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
41  * may share the same VC.
42  *
43  * When creating a class, VCs are specified by passing the number of the open
44  * socket descriptor by which the calling process references the VC. The kernel
45  * keeps the VC open at least until all classes using it are removed.
46  *
47  * In this file, most functions are named atm_tc_* to avoid confusion with all
48  * the atm_* in net/atm. This naming convention differs from what's used in the
49  * rest of net/sched.
50  *
51  * Known bugs:
52  *  - sometimes messes up the IP stack
53  *  - any manipulations besides the few operations described in the README, are
54  *    untested and likely to crash the system
55  *  - should lock the flow while there is data in the queue (?)
56  */
57
58
59 #define PRIV(sch) qdisc_priv(sch)
60 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
61
62
63 struct atm_flow_data {
64         struct Qdisc            *q;             /* FIFO, TBF, etc. */
65         struct tcf_proto        *filter_list;
66         struct atm_vcc          *vcc;           /* VCC; NULL if VCC is closed */
67         void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); /* chaining */
68         struct atm_qdisc_data   *parent;        /* parent qdisc */
69         struct socket           *sock;          /* for closing */
70         u32                     classid;        /* x:y type ID */
71         int                     ref;            /* reference count */
72         struct gnet_stats_basic bstats;
73         struct gnet_stats_queue qstats;
74         spinlock_t              *stats_lock;
75         struct atm_flow_data    *next;
76         struct atm_flow_data    *excess;        /* flow for excess traffic;
77                                                    NULL to set CLP instead */
78         int                     hdr_len;
79         unsigned char           hdr[0];         /* header data; MUST BE LAST */
80 };
81
82 struct atm_qdisc_data {
83         struct atm_flow_data    link;           /* unclassified skbs go here */
84         struct atm_flow_data    *flows;         /* NB: "link" is also on this
85                                                    list */
86         struct tasklet_struct   task;           /* requeue tasklet */
87 };
88
89
90 /* ------------------------- Class/flow operations ------------------------- */
91
92
93 static int find_flow(struct atm_qdisc_data *qdisc,struct atm_flow_data *flow)
94 {
95         struct atm_flow_data *walk;
96
97         DPRINTK("find_flow(qdisc %p,flow %p)\n",qdisc,flow);
98         for (walk = qdisc->flows; walk; walk = walk->next)
99                 if (walk == flow) return 1;
100         DPRINTK("find_flow: not found\n");
101         return 0;
102 }
103
104
105 static __inline__ struct atm_flow_data *lookup_flow(struct Qdisc *sch,
106     u32 classid)
107 {
108         struct atm_qdisc_data *p = PRIV(sch);
109         struct atm_flow_data *flow;
110
111         for (flow = p->flows; flow; flow = flow->next)
112                 if (flow->classid == classid) break;
113         return flow;
114 }
115
116
117 static int atm_tc_graft(struct Qdisc *sch,unsigned long arg,
118     struct Qdisc *new,struct Qdisc **old)
119 {
120         struct atm_qdisc_data *p = PRIV(sch);
121         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
122
123         DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",sch,
124             p,flow,new,old);
125         if (!find_flow(p,flow)) return -EINVAL;
126         if (!new) new = &noop_qdisc;
127         *old = xchg(&flow->q,new);
128         if (*old) qdisc_reset(*old);
129         return 0;
130 }
131
132
133 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch,unsigned long cl)
134 {
135         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
136
137         DPRINTK("atm_tc_leaf(sch %p,flow %p)\n",sch,flow);
138         return flow ? flow->q : NULL;
139 }
140
141
142 static unsigned long atm_tc_get(struct Qdisc *sch,u32 classid)
143 {
144         struct atm_qdisc_data *p __attribute__((unused)) = PRIV(sch);
145         struct atm_flow_data *flow;
146
147         DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
148         flow = lookup_flow(sch,classid);
149         if (flow) flow->ref++;
150         DPRINTK("atm_tc_get: flow %p\n",flow);
151         return (unsigned long) flow;
152 }
153
154
155 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
156     unsigned long parent, u32 classid)
157 {
158         return atm_tc_get(sch,classid);
159 }
160
161
162 static void destroy_filters(struct atm_flow_data *flow)
163 {
164         struct tcf_proto *filter;
165
166         while ((filter = flow->filter_list)) {
167                 DPRINTK("destroy_filters: destroying filter %p\n",filter);
168                 flow->filter_list = filter->next;
169                 tcf_destroy(filter);
170         }
171 }
172
173
174 /*
175  * atm_tc_put handles all destructions, including the ones that are explicitly
176  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
177  * anything that still seems to be in use.
178  */
179
180 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
181 {
182         struct atm_qdisc_data *p = PRIV(sch);
183         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
184         struct atm_flow_data **prev;
185
186         DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
187         if (--flow->ref) return;
188         DPRINTK("atm_tc_put: destroying\n");
189         for (prev = &p->flows; *prev; prev = &(*prev)->next)
190                 if (*prev == flow) break;
191         if (!*prev) {
192                 printk(KERN_CRIT "atm_tc_put: class %p not found\n",flow);
193                 return;
194         }
195         *prev = flow->next;
196         DPRINTK("atm_tc_put: qdisc %p\n",flow->q);
197         qdisc_destroy(flow->q);
198         destroy_filters(flow);
199         if (flow->sock) {
200                 DPRINTK("atm_tc_put: f_count %d\n",
201                     file_count(flow->sock->file));
202                 flow->vcc->pop = flow->old_pop;
203                 sockfd_put(flow->sock);
204         }
205         if (flow->excess) atm_tc_put(sch,(unsigned long) flow->excess);
206         if (flow != &p->link) kfree(flow);
207         /*
208          * If flow == &p->link, the qdisc no longer works at this point and
209          * needs to be removed. (By the caller of atm_tc_put.)
210          */
211 }
212
213
214 static void sch_atm_pop(struct atm_vcc *vcc,struct sk_buff *skb)
215 {
216         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
217
218         D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n",vcc,skb,p);
219         VCC2FLOW(vcc)->old_pop(vcc,skb);
220         tasklet_schedule(&p->task);
221 }
222
223 static const u8 llc_oui_ip[] = {
224         0xaa,           /* DSAP: non-ISO */
225         0xaa,           /* SSAP: non-ISO */
226         0x03,           /* Ctrl: Unnumbered Information Command PDU */
227         0x00,           /* OUI: EtherType */
228         0x00, 0x00,
229         0x08, 0x00 };   /* Ethertype IP (0800) */
230
231 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
232     struct rtattr **tca, unsigned long *arg)
233 {
234         struct atm_qdisc_data *p = PRIV(sch);
235         struct atm_flow_data *flow = (struct atm_flow_data *) *arg;
236         struct atm_flow_data *excess = NULL;
237         struct rtattr *opt = tca[TCA_OPTIONS-1];
238         struct rtattr *tb[TCA_ATM_MAX];
239         struct socket *sock;
240         int fd,error,hdr_len;
241         void *hdr;
242
243         DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
244             "flow %p,opt %p)\n",sch,p,classid,parent,flow,opt);
245         /*
246          * The concept of parents doesn't apply for this qdisc.
247          */
248         if (parent && parent != TC_H_ROOT && parent != sch->handle)
249                 return -EINVAL;
250         /*
251          * ATM classes cannot be changed. In order to change properties of the
252          * ATM connection, that socket needs to be modified directly (via the
253          * native ATM API. In order to send a flow to a different VC, the old
254          * class needs to be removed and a new one added. (This may be changed
255          * later.)
256          */
257         if (flow) return -EBUSY;
258         if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt))
259                 return -EINVAL;
260         if (!tb[TCA_ATM_FD-1] || RTA_PAYLOAD(tb[TCA_ATM_FD-1]) < sizeof(fd))
261                 return -EINVAL;
262         fd = *(int *) RTA_DATA(tb[TCA_ATM_FD-1]);
263         DPRINTK("atm_tc_change: fd %d\n",fd);
264         if (tb[TCA_ATM_HDR-1]) {
265                 hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR-1]);
266                 hdr = RTA_DATA(tb[TCA_ATM_HDR-1]);
267         }
268         else {
269                 hdr_len = RFC1483LLC_LEN;
270                 hdr = NULL; /* default LLC/SNAP for IP */
271         }
272         if (!tb[TCA_ATM_EXCESS-1]) excess = NULL;
273         else {
274                 if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS-1]) != sizeof(u32))
275                         return -EINVAL;
276                 excess = (struct atm_flow_data *) atm_tc_get(sch,
277                     *(u32 *) RTA_DATA(tb[TCA_ATM_EXCESS-1]));
278                 if (!excess) return -ENOENT;
279         }
280         DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n",
281             opt->rta_type,RTA_PAYLOAD(opt),hdr_len);
282         if (!(sock = sockfd_lookup(fd,&error))) return error; /* f_count++ */
283         DPRINTK("atm_tc_change: f_count %d\n",file_count(sock->file));
284         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
285                 error = -EPROTOTYPE;
286                 goto err_out;
287         }
288         /* @@@ should check if the socket is really operational or we'll crash
289            on vcc->send */
290         if (classid) {
291                 if (TC_H_MAJ(classid ^ sch->handle)) {
292                         DPRINTK("atm_tc_change: classid mismatch\n");
293                         error = -EINVAL;
294                         goto err_out;
295                 }
296                 if (find_flow(p,flow)) {
297                         error = -EEXIST;
298                         goto err_out;
299                 }
300         }
301         else {
302                 int i;
303                 unsigned long cl;
304
305                 for (i = 1; i < 0x8000; i++) {
306                         classid = TC_H_MAKE(sch->handle,0x8000 | i);
307                         if (!(cl = atm_tc_get(sch,classid))) break;
308                         atm_tc_put(sch,cl);
309                 }
310         }
311         DPRINTK("atm_tc_change: new id %x\n",classid);
312         flow = kmalloc(sizeof(struct atm_flow_data)+hdr_len,GFP_KERNEL);
313         DPRINTK("atm_tc_change: flow %p\n",flow);
314         if (!flow) {
315                 error = -ENOBUFS;
316                 goto err_out;
317         }
318         memset(flow,0,sizeof(*flow));
319         flow->filter_list = NULL;
320         if (!(flow->q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops,classid)))
321                 flow->q = &noop_qdisc;
322         DPRINTK("atm_tc_change: qdisc %p\n",flow->q);
323         flow->sock = sock;
324         flow->vcc = ATM_SD(sock); /* speedup */
325         flow->vcc->user_back = flow;
326         DPRINTK("atm_tc_change: vcc %p\n",flow->vcc);
327         flow->old_pop = flow->vcc->pop;
328         flow->parent = p;
329         flow->vcc->pop = sch_atm_pop;
330         flow->classid = classid;
331         flow->ref = 1;
332         flow->excess = excess;
333         flow->next = p->link.next;
334         p->link.next = flow;
335         flow->hdr_len = hdr_len;
336         if (hdr)
337                 memcpy(flow->hdr,hdr,hdr_len);
338         else
339                 memcpy(flow->hdr,llc_oui_ip,sizeof(llc_oui_ip));
340         *arg = (unsigned long) flow;
341         return 0;
342 err_out:
343         if (excess) atm_tc_put(sch,(unsigned long) excess);
344         sockfd_put(sock);
345         return error;
346 }
347
348
349 static int atm_tc_delete(struct Qdisc *sch,unsigned long arg)
350 {
351         struct atm_qdisc_data *p = PRIV(sch);
352         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
353
354         DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
355         if (!find_flow(PRIV(sch),flow)) return -EINVAL;
356         if (flow->filter_list || flow == &p->link) return -EBUSY;
357         /*
358          * Reference count must be 2: one for "keepalive" (set at class
359          * creation), and one for the reference held when calling delete.
360          */
361         if (flow->ref < 2) {
362                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n",flow->ref);
363                 return -EINVAL;
364         }
365         if (flow->ref > 2) return -EBUSY; /* catch references via excess, etc.*/
366         atm_tc_put(sch,arg);
367         return 0;
368 }
369
370
371 static void atm_tc_walk(struct Qdisc *sch,struct qdisc_walker *walker)
372 {
373         struct atm_qdisc_data *p = PRIV(sch);
374         struct atm_flow_data *flow;
375
376         DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
377         if (walker->stop) return;
378         for (flow = p->flows; flow; flow = flow->next) {
379                 if (walker->count >= walker->skip)
380                         if (walker->fn(sch,(unsigned long) flow,walker) < 0) {
381                                 walker->stop = 1;
382                                 break;
383                         }
384                 walker->count++;
385         }
386 }
387
388
389 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch,unsigned long cl)
390 {
391         struct atm_qdisc_data *p = PRIV(sch);
392         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
393
394         DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n",sch,p,flow);
395         return flow ? &flow->filter_list : &p->link.filter_list;
396 }
397
398
399 /* --------------------------- Qdisc operations ---------------------------- */
400
401
402 static int atm_tc_enqueue(struct sk_buff *skb,struct Qdisc *sch)
403 {
404         struct atm_qdisc_data *p = PRIV(sch);
405         struct atm_flow_data *flow = NULL ; /* @@@ */
406         struct tcf_result res;
407         int result;
408         int ret = NET_XMIT_POLICED;
409
410         D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
411         result = TC_POLICE_OK; /* be nice to gcc */
412         if (TC_H_MAJ(skb->priority) != sch->handle ||
413             !(flow = (struct atm_flow_data *) atm_tc_get(sch,skb->priority)))
414                 for (flow = p->flows; flow; flow = flow->next)
415                         if (flow->filter_list) {
416                                 result = tc_classify(skb,flow->filter_list,
417                                     &res);
418                                 if (result < 0) continue;
419                                 flow = (struct atm_flow_data *) res.class;
420                                 if (!flow) flow = lookup_flow(sch,res.classid);
421                                 break;
422                         }
423         if (!flow) flow = &p->link;
424         else {
425                 if (flow->vcc)
426                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
427                         /*@@@ looks good ... but it's not supposed to work :-)*/
428 #ifdef CONFIG_NET_CLS_POLICE
429                 switch (result) {
430                         case TC_POLICE_SHOT:
431                                 kfree_skb(skb);
432                                 break;
433                         case TC_POLICE_RECLASSIFY:
434                                 if (flow->excess) flow = flow->excess;
435                                 else {
436                                         ATM_SKB(skb)->atm_options |=
437                                             ATM_ATMOPT_CLP;
438                                         break;
439                                 }
440                                 /* fall through */
441                         case TC_POLICE_OK:
442                                 /* fall through */
443                         default:
444                                 break;
445                 }
446 #endif
447         }
448         if (
449 #ifdef CONFIG_NET_CLS_POLICE
450             result == TC_POLICE_SHOT ||
451 #endif
452             (ret = flow->q->enqueue(skb,flow->q)) != 0) {
453                 sch->qstats.drops++;
454                 if (flow) flow->qstats.drops++;
455                 return ret;
456         }
457         sch->bstats.bytes += skb->len;
458         sch->bstats.packets++;
459         flow->bstats.bytes += skb->len;
460         flow->bstats.packets++;
461         /*
462          * Okay, this may seem weird. We pretend we've dropped the packet if
463          * it goes via ATM. The reason for this is that the outer qdisc
464          * expects to be able to q->dequeue the packet later on if we return
465          * success at this place. Also, sch->q.qdisc needs to reflect whether
466          * there is a packet egligible for dequeuing or not. Note that the
467          * statistics of the outer qdisc are necessarily wrong because of all
468          * this. There's currently no correct solution for this.
469          */
470         if (flow == &p->link) {
471                 sch->q.qlen++;
472                 return 0;
473         }
474         tasklet_schedule(&p->task);
475         return NET_XMIT_BYPASS;
476 }
477
478
479 /*
480  * Dequeue packets and send them over ATM. Note that we quite deliberately
481  * avoid checking net_device's flow control here, simply because sch_atm
482  * uses its own channels, which have nothing to do with any CLIP/LANE/or
483  * non-ATM interfaces.
484  */
485
486
487 static void sch_atm_dequeue(unsigned long data)
488 {
489         struct Qdisc *sch = (struct Qdisc *) data;
490         struct atm_qdisc_data *p = PRIV(sch);
491         struct atm_flow_data *flow;
492         struct sk_buff *skb;
493
494         D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n",sch,p);
495         for (flow = p->link.next; flow; flow = flow->next)
496                 /*
497                  * If traffic is properly shaped, this won't generate nasty
498                  * little bursts. Otherwise, it may ... (but that's okay)
499                  */
500                 while ((skb = flow->q->dequeue(flow->q))) {
501                         if (!atm_may_send(flow->vcc,skb->truesize)) {
502                                 (void) flow->q->ops->requeue(skb,flow->q);
503                                 break;
504                         }
505                         D2PRINTK("atm_tc_dequeue: sending on class %p\n",flow);
506                         /* remove any LL header somebody else has attached */
507                         skb_pull(skb, skb_network_offset(skb));
508                         if (skb_headroom(skb) < flow->hdr_len) {
509                                 struct sk_buff *new;
510
511                                 new = skb_realloc_headroom(skb,flow->hdr_len);
512                                 dev_kfree_skb(skb);
513                                 if (!new) continue;
514                                 skb = new;
515                         }
516                         D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
517                                  skb_network_header(skb), skb->data);
518                         ATM_SKB(skb)->vcc = flow->vcc;
519                         memcpy(skb_push(skb,flow->hdr_len),flow->hdr,
520                             flow->hdr_len);
521                         atomic_add(skb->truesize,
522                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
523                         /* atm.atm_options are already set by atm_tc_enqueue */
524                         (void) flow->vcc->send(flow->vcc,skb);
525                 }
526 }
527
528
529 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
530 {
531         struct atm_qdisc_data *p = PRIV(sch);
532         struct sk_buff *skb;
533
534         D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n",sch,p);
535         tasklet_schedule(&p->task);
536         skb = p->link.q->dequeue(p->link.q);
537         if (skb) sch->q.qlen--;
538         return skb;
539 }
540
541
542 static int atm_tc_requeue(struct sk_buff *skb,struct Qdisc *sch)
543 {
544         struct atm_qdisc_data *p = PRIV(sch);
545         int ret;
546
547         D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
548         ret = p->link.q->ops->requeue(skb,p->link.q);
549         if (!ret) {
550         sch->q.qlen++;
551         sch->qstats.requeues++;
552     } else {
553                 sch->qstats.drops++;
554                 p->link.qstats.drops++;
555         }
556         return ret;
557 }
558
559
560 static unsigned int atm_tc_drop(struct Qdisc *sch)
561 {
562         struct atm_qdisc_data *p = PRIV(sch);
563         struct atm_flow_data *flow;
564         unsigned int len;
565
566         DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n",sch,p);
567         for (flow = p->flows; flow; flow = flow->next)
568                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
569                         return len;
570         return 0;
571 }
572
573
574 static int atm_tc_init(struct Qdisc *sch,struct rtattr *opt)
575 {
576         struct atm_qdisc_data *p = PRIV(sch);
577
578         DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
579         p->flows = &p->link;
580         if(!(p->link.q = qdisc_create_dflt(sch->dev,&pfifo_qdisc_ops,
581                                            sch->handle)))
582                 p->link.q = &noop_qdisc;
583         DPRINTK("atm_tc_init: link (%p) qdisc %p\n",&p->link,p->link.q);
584         p->link.filter_list = NULL;
585         p->link.vcc = NULL;
586         p->link.sock = NULL;
587         p->link.classid = sch->handle;
588         p->link.ref = 1;
589         p->link.next = NULL;
590         tasklet_init(&p->task,sch_atm_dequeue,(unsigned long) sch);
591         return 0;
592 }
593
594
595 static void atm_tc_reset(struct Qdisc *sch)
596 {
597         struct atm_qdisc_data *p = PRIV(sch);
598         struct atm_flow_data *flow;
599
600         DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n",sch,p);
601         for (flow = p->flows; flow; flow = flow->next) qdisc_reset(flow->q);
602         sch->q.qlen = 0;
603 }
604
605
606 static void atm_tc_destroy(struct Qdisc *sch)
607 {
608         struct atm_qdisc_data *p = PRIV(sch);
609         struct atm_flow_data *flow;
610
611         DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n",sch,p);
612         /* races ? */
613         while ((flow = p->flows)) {
614                 destroy_filters(flow);
615                 if (flow->ref > 1)
616                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n",flow,
617                             flow->ref);
618                 atm_tc_put(sch,(unsigned long) flow);
619                 if (p->flows == flow) {
620                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
621                             "kill it\n",flow);
622                         p->flows = flow->next; /* brute force */
623                         break;
624                 }
625         }
626         tasklet_kill(&p->task);
627 }
628
629
630 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
631     struct sk_buff *skb, struct tcmsg *tcm)
632 {
633         struct atm_qdisc_data *p = PRIV(sch);
634         struct atm_flow_data *flow = (struct atm_flow_data *) cl;
635         unsigned char *b = skb_tail_pointer(skb);
636         struct rtattr *rta;
637
638         DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
639             sch,p,flow,skb,tcm);
640         if (!find_flow(p,flow)) return -EINVAL;
641         tcm->tcm_handle = flow->classid;
642         tcm->tcm_info = flow->q->handle;
643         rta = (struct rtattr *) b;
644         RTA_PUT(skb,TCA_OPTIONS,0,NULL);
645         RTA_PUT(skb,TCA_ATM_HDR,flow->hdr_len,flow->hdr);
646         if (flow->vcc) {
647                 struct sockaddr_atmpvc pvc;
648                 int state;
649
650                 pvc.sap_family = AF_ATMPVC;
651                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
652                 pvc.sap_addr.vpi = flow->vcc->vpi;
653                 pvc.sap_addr.vci = flow->vcc->vci;
654                 RTA_PUT(skb,TCA_ATM_ADDR,sizeof(pvc),&pvc);
655                 state = ATM_VF2VS(flow->vcc->flags);
656                 RTA_PUT(skb,TCA_ATM_STATE,sizeof(state),&state);
657         }
658         if (flow->excess)
659                 RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(u32),&flow->classid);
660         else {
661                 static u32 zero;
662
663                 RTA_PUT(skb,TCA_ATM_EXCESS,sizeof(zero),&zero);
664         }
665         rta->rta_len = skb_tail_pointer(skb) - b;
666         return skb->len;
667
668 rtattr_failure:
669         nlmsg_trim(skb, b);
670         return -1;
671 }
672 static int
673 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
674         struct gnet_dump *d)
675 {
676         struct atm_flow_data *flow = (struct atm_flow_data *) arg;
677
678         flow->qstats.qlen = flow->q->q.qlen;
679
680         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
681             gnet_stats_copy_queue(d, &flow->qstats) < 0)
682                 return -1;
683
684         return 0;
685 }
686
687 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
688 {
689         return 0;
690 }
691
692 static struct Qdisc_class_ops atm_class_ops = {
693         .graft          =       atm_tc_graft,
694         .leaf           =       atm_tc_leaf,
695         .get            =       atm_tc_get,
696         .put            =       atm_tc_put,
697         .change         =       atm_tc_change,
698         .delete         =       atm_tc_delete,
699         .walk           =       atm_tc_walk,
700         .tcf_chain      =       atm_tc_find_tcf,
701         .bind_tcf       =       atm_tc_bind_filter,
702         .unbind_tcf     =       atm_tc_put,
703         .dump           =       atm_tc_dump_class,
704         .dump_stats     =       atm_tc_dump_class_stats,
705 };
706
707 static struct Qdisc_ops atm_qdisc_ops = {
708         .next           =       NULL,
709         .cl_ops         =       &atm_class_ops,
710         .id             =       "atm",
711         .priv_size      =       sizeof(struct atm_qdisc_data),
712         .enqueue        =       atm_tc_enqueue,
713         .dequeue        =       atm_tc_dequeue,
714         .requeue        =       atm_tc_requeue,
715         .drop           =       atm_tc_drop,
716         .init           =       atm_tc_init,
717         .reset          =       atm_tc_reset,
718         .destroy        =       atm_tc_destroy,
719         .change         =       NULL,
720         .dump           =       atm_tc_dump,
721         .owner          =       THIS_MODULE,
722 };
723
724
725 static int __init atm_init(void)
726 {
727         return register_qdisc(&atm_qdisc_ops);
728 }
729
730 static void __exit atm_exit(void)
731 {
732         unregister_qdisc(&atm_qdisc_ops);
733 }
734
735 module_init(atm_init)
736 module_exit(atm_exit)
737 MODULE_LICENSE("GPL");