Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / 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 #if 0 /* control */
20 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
21 #else
22 #define DPRINTK(format,args...)
23 #endif
24
25 #if 0 /* data */
26 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
27 #else
28 #define D2PRINTK(format,args...)
29 #endif
30
31 /*
32  * The ATM queuing discipline provides a framework for invoking classifiers
33  * (aka "filters"), which in turn select classes of this queuing discipline.
34  * Each class maps the flow(s) it is handling to a given VC. Multiple classes
35  * may share the same VC.
36  *
37  * When creating a class, VCs are specified by passing the number of the open
38  * socket descriptor by which the calling process references the VC. The kernel
39  * keeps the VC open at least until all classes using it are removed.
40  *
41  * In this file, most functions are named atm_tc_* to avoid confusion with all
42  * the atm_* in net/atm. This naming convention differs from what's used in the
43  * rest of net/sched.
44  *
45  * Known bugs:
46  *  - sometimes messes up the IP stack
47  *  - any manipulations besides the few operations described in the README, are
48  *    untested and likely to crash the system
49  *  - should lock the flow while there is data in the queue (?)
50  */
51
52 #define PRIV(sch) qdisc_priv(sch)
53 #define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
54
55 struct atm_flow_data {
56         struct Qdisc            *q;     /* FIFO, TBF, etc. */
57         struct tcf_proto        *filter_list;
58         struct atm_vcc          *vcc;   /* VCC; NULL if VCC is closed */
59         void                    (*old_pop)(struct atm_vcc *vcc,
60                                            struct sk_buff * skb); /* chaining */
61         struct atm_qdisc_data   *parent;        /* parent qdisc */
62         struct socket           *sock;          /* for closing */
63         u32                     classid;        /* x:y type ID */
64         int                     ref;            /* reference count */
65         struct gnet_stats_basic bstats;
66         struct gnet_stats_queue qstats;
67         struct atm_flow_data    *next;
68         struct atm_flow_data    *excess;        /* flow for excess traffic;
69                                                    NULL to set CLP instead */
70         int                     hdr_len;
71         unsigned char           hdr[0];         /* header data; MUST BE LAST */
72 };
73
74 struct atm_qdisc_data {
75         struct atm_flow_data    link;           /* unclassified skbs go here */
76         struct atm_flow_data    *flows;         /* NB: "link" is also on this
77                                                    list */
78         struct tasklet_struct   task;           /* requeue tasklet */
79 };
80
81 /* ------------------------- Class/flow operations ------------------------- */
82
83 static int find_flow(struct atm_qdisc_data *qdisc, struct atm_flow_data *flow)
84 {
85         struct atm_flow_data *walk;
86
87         DPRINTK("find_flow(qdisc %p,flow %p)\n", qdisc, flow);
88         for (walk = qdisc->flows; walk; walk = walk->next)
89                 if (walk == flow)
90                         return 1;
91         DPRINTK("find_flow: not found\n");
92         return 0;
93 }
94
95 static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
96 {
97         struct atm_qdisc_data *p = PRIV(sch);
98         struct atm_flow_data *flow;
99
100         for (flow = p->flows; flow; flow = flow->next)
101                 if (flow->classid == classid)
102                         break;
103         return flow;
104 }
105
106 static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
107                         struct Qdisc *new, struct Qdisc **old)
108 {
109         struct atm_qdisc_data *p = PRIV(sch);
110         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
111
112         DPRINTK("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
113                 sch, p, flow, new, old);
114         if (!find_flow(p, flow))
115                 return -EINVAL;
116         if (!new)
117                 new = &noop_qdisc;
118         *old = xchg(&flow->q, new);
119         if (*old)
120                 qdisc_reset(*old);
121         return 0;
122 }
123
124 static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
125 {
126         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
127
128         DPRINTK("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
129         return flow ? flow->q : NULL;
130 }
131
132 static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
133 {
134         struct atm_qdisc_data *p __maybe_unused = PRIV(sch);
135         struct atm_flow_data *flow;
136
137         DPRINTK("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
138         flow = lookup_flow(sch, classid);
139         if (flow)
140                 flow->ref++;
141         DPRINTK("atm_tc_get: flow %p\n", flow);
142         return (unsigned long)flow;
143 }
144
145 static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
146                                         unsigned long parent, u32 classid)
147 {
148         return atm_tc_get(sch, classid);
149 }
150
151 /*
152  * atm_tc_put handles all destructions, including the ones that are explicitly
153  * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
154  * anything that still seems to be in use.
155  */
156 static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
157 {
158         struct atm_qdisc_data *p = PRIV(sch);
159         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
160         struct atm_flow_data **prev;
161
162         DPRINTK("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
163         if (--flow->ref)
164                 return;
165         DPRINTK("atm_tc_put: destroying\n");
166         for (prev = &p->flows; *prev; prev = &(*prev)->next)
167                 if (*prev == flow)
168                         break;
169         if (!*prev) {
170                 printk(KERN_CRIT "atm_tc_put: class %p not found\n", flow);
171                 return;
172         }
173         *prev = flow->next;
174         DPRINTK("atm_tc_put: qdisc %p\n", flow->q);
175         qdisc_destroy(flow->q);
176         tcf_destroy_chain(flow->filter_list);
177         if (flow->sock) {
178                 DPRINTK("atm_tc_put: f_count %d\n",
179                         file_count(flow->sock->file));
180                 flow->vcc->pop = flow->old_pop;
181                 sockfd_put(flow->sock);
182         }
183         if (flow->excess)
184                 atm_tc_put(sch, (unsigned long)flow->excess);
185         if (flow != &p->link)
186                 kfree(flow);
187         /*
188          * If flow == &p->link, the qdisc no longer works at this point and
189          * needs to be removed. (By the caller of atm_tc_put.)
190          */
191 }
192
193 static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
194 {
195         struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
196
197         D2PRINTK("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
198         VCC2FLOW(vcc)->old_pop(vcc, skb);
199         tasklet_schedule(&p->task);
200 }
201
202 static const u8 llc_oui_ip[] = {
203         0xaa,                   /* DSAP: non-ISO */
204         0xaa,                   /* SSAP: non-ISO */
205         0x03,                   /* Ctrl: Unnumbered Information Command PDU */
206         0x00,                   /* OUI: EtherType */
207         0x00, 0x00,
208         0x08, 0x00
209 };                              /* Ethertype IP (0800) */
210
211 static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
212                          struct rtattr **tca, unsigned long *arg)
213 {
214         struct atm_qdisc_data *p = PRIV(sch);
215         struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
216         struct atm_flow_data *excess = NULL;
217         struct rtattr *opt = tca[TCA_OPTIONS - 1];
218         struct rtattr *tb[TCA_ATM_MAX];
219         struct socket *sock;
220         int fd, error, hdr_len;
221         void *hdr;
222
223         DPRINTK("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
224                 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
225         /*
226          * The concept of parents doesn't apply for this qdisc.
227          */
228         if (parent && parent != TC_H_ROOT && parent != sch->handle)
229                 return -EINVAL;
230         /*
231          * ATM classes cannot be changed. In order to change properties of the
232          * ATM connection, that socket needs to be modified directly (via the
233          * native ATM API. In order to send a flow to a different VC, the old
234          * class needs to be removed and a new one added. (This may be changed
235          * later.)
236          */
237         if (flow)
238                 return -EBUSY;
239         if (opt == NULL || rtattr_parse_nested(tb, TCA_ATM_MAX, opt))
240                 return -EINVAL;
241         if (!tb[TCA_ATM_FD - 1] || RTA_PAYLOAD(tb[TCA_ATM_FD - 1]) < sizeof(fd))
242                 return -EINVAL;
243         fd = *(int *)RTA_DATA(tb[TCA_ATM_FD - 1]);
244         DPRINTK("atm_tc_change: fd %d\n", fd);
245         if (tb[TCA_ATM_HDR - 1]) {
246                 hdr_len = RTA_PAYLOAD(tb[TCA_ATM_HDR - 1]);
247                 hdr = RTA_DATA(tb[TCA_ATM_HDR - 1]);
248         } else {
249                 hdr_len = RFC1483LLC_LEN;
250                 hdr = NULL;     /* default LLC/SNAP for IP */
251         }
252         if (!tb[TCA_ATM_EXCESS - 1])
253                 excess = NULL;
254         else {
255                 if (RTA_PAYLOAD(tb[TCA_ATM_EXCESS - 1]) != sizeof(u32))
256                         return -EINVAL;
257                 excess = (struct atm_flow_data *)
258                         atm_tc_get(sch, *(u32 *)RTA_DATA(tb[TCA_ATM_EXCESS - 1]));
259                 if (!excess)
260                         return -ENOENT;
261         }
262         DPRINTK("atm_tc_change: type %d, payload %d, hdr_len %d\n",
263                 opt->rta_type, RTA_PAYLOAD(opt), hdr_len);
264         if (!(sock = sockfd_lookup(fd, &error)))
265                 return error;   /* f_count++ */
266         DPRINTK("atm_tc_change: f_count %d\n", file_count(sock->file));
267         if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
268                 error = -EPROTOTYPE;
269                 goto err_out;
270         }
271         /* @@@ should check if the socket is really operational or we'll crash
272            on vcc->send */
273         if (classid) {
274                 if (TC_H_MAJ(classid ^ sch->handle)) {
275                         DPRINTK("atm_tc_change: classid mismatch\n");
276                         error = -EINVAL;
277                         goto err_out;
278                 }
279                 if (find_flow(p, flow)) {
280                         error = -EEXIST;
281                         goto err_out;
282                 }
283         } else {
284                 int i;
285                 unsigned long cl;
286
287                 for (i = 1; i < 0x8000; i++) {
288                         classid = TC_H_MAKE(sch->handle, 0x8000 | i);
289                         if (!(cl = atm_tc_get(sch, classid)))
290                                 break;
291                         atm_tc_put(sch, cl);
292                 }
293         }
294         DPRINTK("atm_tc_change: new id %x\n", classid);
295         flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
296         DPRINTK("atm_tc_change: flow %p\n", flow);
297         if (!flow) {
298                 error = -ENOBUFS;
299                 goto err_out;
300         }
301         flow->filter_list = NULL;
302         if (!(flow->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid)))
303                 flow->q = &noop_qdisc;
304         DPRINTK("atm_tc_change: qdisc %p\n", flow->q);
305         flow->sock = sock;
306         flow->vcc = ATM_SD(sock);       /* speedup */
307         flow->vcc->user_back = flow;
308         DPRINTK("atm_tc_change: vcc %p\n", flow->vcc);
309         flow->old_pop = flow->vcc->pop;
310         flow->parent = p;
311         flow->vcc->pop = sch_atm_pop;
312         flow->classid = classid;
313         flow->ref = 1;
314         flow->excess = excess;
315         flow->next = p->link.next;
316         p->link.next = flow;
317         flow->hdr_len = hdr_len;
318         if (hdr)
319                 memcpy(flow->hdr, hdr, hdr_len);
320         else
321                 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
322         *arg = (unsigned long)flow;
323         return 0;
324 err_out:
325         if (excess)
326                 atm_tc_put(sch, (unsigned long)excess);
327         sockfd_put(sock);
328         return error;
329 }
330
331 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
332 {
333         struct atm_qdisc_data *p = PRIV(sch);
334         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
335
336         DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
337         if (!find_flow(PRIV(sch), flow))
338                 return -EINVAL;
339         if (flow->filter_list || flow == &p->link)
340                 return -EBUSY;
341         /*
342          * Reference count must be 2: one for "keepalive" (set at class
343          * creation), and one for the reference held when calling delete.
344          */
345         if (flow->ref < 2) {
346                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
347                 return -EINVAL;
348         }
349         if (flow->ref > 2)
350                 return -EBUSY;  /* catch references via excess, etc. */
351         atm_tc_put(sch, arg);
352         return 0;
353 }
354
355 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
356 {
357         struct atm_qdisc_data *p = PRIV(sch);
358         struct atm_flow_data *flow;
359
360         DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
361         if (walker->stop)
362                 return;
363         for (flow = p->flows; flow; flow = flow->next) {
364                 if (walker->count >= walker->skip)
365                         if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
366                                 walker->stop = 1;
367                                 break;
368                         }
369                 walker->count++;
370         }
371 }
372
373 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
374 {
375         struct atm_qdisc_data *p = PRIV(sch);
376         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
377
378         DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
379         return flow ? &flow->filter_list : &p->link.filter_list;
380 }
381
382 /* --------------------------- Qdisc operations ---------------------------- */
383
384 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
385 {
386         struct atm_qdisc_data *p = PRIV(sch);
387         struct atm_flow_data *flow = NULL;      /* @@@ */
388         struct tcf_result res;
389         int result;
390         int ret = NET_XMIT_POLICED;
391
392         D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
393         result = TC_POLICE_OK;  /* be nice to gcc */
394         if (TC_H_MAJ(skb->priority) != sch->handle ||
395             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
396                 for (flow = p->flows; flow; flow = flow->next)
397                         if (flow->filter_list) {
398                                 result = tc_classify_compat(skb,
399                                                             flow->filter_list,
400                                                             &res);
401                                 if (result < 0)
402                                         continue;
403                                 flow = (struct atm_flow_data *)res.class;
404                                 if (!flow)
405                                         flow = lookup_flow(sch, res.classid);
406                                 break;
407                         }
408         if (!flow)
409                 flow = &p->link;
410         else {
411                 if (flow->vcc)
412                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
413                 /*@@@ looks good ... but it's not supposed to work :-) */
414 #ifdef CONFIG_NET_CLS_ACT
415                 switch (result) {
416                 case TC_ACT_QUEUED:
417                 case TC_ACT_STOLEN:
418                         kfree_skb(skb);
419                         return NET_XMIT_SUCCESS;
420                 case TC_ACT_SHOT:
421                         kfree_skb(skb);
422                         goto drop;
423                 case TC_POLICE_RECLASSIFY:
424                         if (flow->excess)
425                                 flow = flow->excess;
426                         else
427                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
428                         break;
429                 }
430 #endif
431         }
432
433         if ((ret = flow->q->enqueue(skb, flow->q)) != 0) {
434 drop: __maybe_unused
435                 sch->qstats.drops++;
436                 if (flow)
437                         flow->qstats.drops++;
438                 return ret;
439         }
440         sch->bstats.bytes += skb->len;
441         sch->bstats.packets++;
442         flow->bstats.bytes += skb->len;
443         flow->bstats.packets++;
444         /*
445          * Okay, this may seem weird. We pretend we've dropped the packet if
446          * it goes via ATM. The reason for this is that the outer qdisc
447          * expects to be able to q->dequeue the packet later on if we return
448          * success at this place. Also, sch->q.qdisc needs to reflect whether
449          * there is a packet egligible for dequeuing or not. Note that the
450          * statistics of the outer qdisc are necessarily wrong because of all
451          * this. There's currently no correct solution for this.
452          */
453         if (flow == &p->link) {
454                 sch->q.qlen++;
455                 return 0;
456         }
457         tasklet_schedule(&p->task);
458         return NET_XMIT_BYPASS;
459 }
460
461 /*
462  * Dequeue packets and send them over ATM. Note that we quite deliberately
463  * avoid checking net_device's flow control here, simply because sch_atm
464  * uses its own channels, which have nothing to do with any CLIP/LANE/or
465  * non-ATM interfaces.
466  */
467
468 static void sch_atm_dequeue(unsigned long data)
469 {
470         struct Qdisc *sch = (struct Qdisc *)data;
471         struct atm_qdisc_data *p = PRIV(sch);
472         struct atm_flow_data *flow;
473         struct sk_buff *skb;
474
475         D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
476         for (flow = p->link.next; flow; flow = flow->next)
477                 /*
478                  * If traffic is properly shaped, this won't generate nasty
479                  * little bursts. Otherwise, it may ... (but that's okay)
480                  */
481                 while ((skb = flow->q->dequeue(flow->q))) {
482                         if (!atm_may_send(flow->vcc, skb->truesize)) {
483                                 (void)flow->q->ops->requeue(skb, flow->q);
484                                 break;
485                         }
486                         D2PRINTK("atm_tc_dequeue: sending on class %p\n", flow);
487                         /* remove any LL header somebody else has attached */
488                         skb_pull(skb, skb_network_offset(skb));
489                         if (skb_headroom(skb) < flow->hdr_len) {
490                                 struct sk_buff *new;
491
492                                 new = skb_realloc_headroom(skb, flow->hdr_len);
493                                 dev_kfree_skb(skb);
494                                 if (!new)
495                                         continue;
496                                 skb = new;
497                         }
498                         D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
499                                  skb_network_header(skb), skb->data);
500                         ATM_SKB(skb)->vcc = flow->vcc;
501                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
502                                flow->hdr_len);
503                         atomic_add(skb->truesize,
504                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
505                         /* atm.atm_options are already set by atm_tc_enqueue */
506                         flow->vcc->send(flow->vcc, skb);
507                 }
508 }
509
510 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
511 {
512         struct atm_qdisc_data *p = PRIV(sch);
513         struct sk_buff *skb;
514
515         D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
516         tasklet_schedule(&p->task);
517         skb = p->link.q->dequeue(p->link.q);
518         if (skb)
519                 sch->q.qlen--;
520         return skb;
521 }
522
523 static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
524 {
525         struct atm_qdisc_data *p = PRIV(sch);
526         int ret;
527
528         D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
529         ret = p->link.q->ops->requeue(skb, p->link.q);
530         if (!ret) {
531                 sch->q.qlen++;
532                 sch->qstats.requeues++;
533         } else {
534                 sch->qstats.drops++;
535                 p->link.qstats.drops++;
536         }
537         return ret;
538 }
539
540 static unsigned int atm_tc_drop(struct Qdisc *sch)
541 {
542         struct atm_qdisc_data *p = PRIV(sch);
543         struct atm_flow_data *flow;
544         unsigned int len;
545
546         DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
547         for (flow = p->flows; flow; flow = flow->next)
548                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
549                         return len;
550         return 0;
551 }
552
553 static int atm_tc_init(struct Qdisc *sch, struct rtattr *opt)
554 {
555         struct atm_qdisc_data *p = PRIV(sch);
556
557         DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
558         p->flows = &p->link;
559         if (!(p->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
560                                             sch->handle)))
561                 p->link.q = &noop_qdisc;
562         DPRINTK("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
563         p->link.filter_list = NULL;
564         p->link.vcc = NULL;
565         p->link.sock = NULL;
566         p->link.classid = sch->handle;
567         p->link.ref = 1;
568         p->link.next = NULL;
569         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
570         return 0;
571 }
572
573 static void atm_tc_reset(struct Qdisc *sch)
574 {
575         struct atm_qdisc_data *p = PRIV(sch);
576         struct atm_flow_data *flow;
577
578         DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
579         for (flow = p->flows; flow; flow = flow->next)
580                 qdisc_reset(flow->q);
581         sch->q.qlen = 0;
582 }
583
584 static void atm_tc_destroy(struct Qdisc *sch)
585 {
586         struct atm_qdisc_data *p = PRIV(sch);
587         struct atm_flow_data *flow;
588
589         DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
590         /* races ? */
591         while ((flow = p->flows)) {
592                 tcf_destroy_chain(flow->filter_list);
593                 flow->filter_list = NULL;
594                 if (flow->ref > 1)
595                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
596                                flow->ref);
597                 atm_tc_put(sch, (unsigned long)flow);
598                 if (p->flows == flow) {
599                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
600                                "kill it\n", flow);
601                         p->flows = flow->next;  /* brute force */
602                         break;
603                 }
604         }
605         tasklet_kill(&p->task);
606 }
607
608 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
609                              struct sk_buff *skb, struct tcmsg *tcm)
610 {
611         struct atm_qdisc_data *p = PRIV(sch);
612         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
613         unsigned char *b = skb_tail_pointer(skb);
614         struct rtattr *rta;
615
616         DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
617                 sch, p, flow, skb, tcm);
618         if (!find_flow(p, flow))
619                 return -EINVAL;
620         tcm->tcm_handle = flow->classid;
621         tcm->tcm_info = flow->q->handle;
622         rta = (struct rtattr *)b;
623         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
624         RTA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
625         if (flow->vcc) {
626                 struct sockaddr_atmpvc pvc;
627                 int state;
628
629                 pvc.sap_family = AF_ATMPVC;
630                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
631                 pvc.sap_addr.vpi = flow->vcc->vpi;
632                 pvc.sap_addr.vci = flow->vcc->vci;
633                 RTA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
634                 state = ATM_VF2VS(flow->vcc->flags);
635                 RTA_PUT(skb, TCA_ATM_STATE, sizeof(state), &state);
636         }
637         if (flow->excess)
638                 RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(u32), &flow->classid);
639         else {
640                 static u32 zero;
641
642                 RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(zero), &zero);
643         }
644         rta->rta_len = skb_tail_pointer(skb) - b;
645         return skb->len;
646
647 rtattr_failure:
648         nlmsg_trim(skb, b);
649         return -1;
650 }
651 static int
652 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
653                         struct gnet_dump *d)
654 {
655         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
656
657         flow->qstats.qlen = flow->q->q.qlen;
658
659         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
660             gnet_stats_copy_queue(d, &flow->qstats) < 0)
661                 return -1;
662
663         return 0;
664 }
665
666 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
667 {
668         return 0;
669 }
670
671 static struct Qdisc_class_ops atm_class_ops = {
672         .graft          = atm_tc_graft,
673         .leaf           = atm_tc_leaf,
674         .get            = atm_tc_get,
675         .put            = atm_tc_put,
676         .change         = atm_tc_change,
677         .delete         = atm_tc_delete,
678         .walk           = atm_tc_walk,
679         .tcf_chain      = atm_tc_find_tcf,
680         .bind_tcf       = atm_tc_bind_filter,
681         .unbind_tcf     = atm_tc_put,
682         .dump           = atm_tc_dump_class,
683         .dump_stats     = atm_tc_dump_class_stats,
684 };
685
686 static struct Qdisc_ops atm_qdisc_ops = {
687         .cl_ops         = &atm_class_ops,
688         .id             = "atm",
689         .priv_size      = sizeof(struct atm_qdisc_data),
690         .enqueue        = atm_tc_enqueue,
691         .dequeue        = atm_tc_dequeue,
692         .requeue        = atm_tc_requeue,
693         .drop           = atm_tc_drop,
694         .init           = atm_tc_init,
695         .reset          = atm_tc_reset,
696         .destroy        = atm_tc_destroy,
697         .dump           = atm_tc_dump,
698         .owner          = THIS_MODULE,
699 };
700
701 static int __init atm_init(void)
702 {
703         return register_qdisc(&atm_qdisc_ops);
704 }
705
706 static void __exit atm_exit(void)
707 {
708         unregister_qdisc(&atm_qdisc_ops);
709 }
710
711 module_init(atm_init)
712 module_exit(atm_exit)
713 MODULE_LICENSE("GPL");