[NET_SCHED]: Kill CONFIG_NET_CLS_POLICE
[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 #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 = kmalloc(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         memset(flow, 0, sizeof(*flow));
302         flow->filter_list = NULL;
303         if (!(flow->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, classid)))
304                 flow->q = &noop_qdisc;
305         DPRINTK("atm_tc_change: qdisc %p\n", flow->q);
306         flow->sock = sock;
307         flow->vcc = ATM_SD(sock);       /* speedup */
308         flow->vcc->user_back = flow;
309         DPRINTK("atm_tc_change: vcc %p\n", flow->vcc);
310         flow->old_pop = flow->vcc->pop;
311         flow->parent = p;
312         flow->vcc->pop = sch_atm_pop;
313         flow->classid = classid;
314         flow->ref = 1;
315         flow->excess = excess;
316         flow->next = p->link.next;
317         p->link.next = flow;
318         flow->hdr_len = hdr_len;
319         if (hdr)
320                 memcpy(flow->hdr, hdr, hdr_len);
321         else
322                 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
323         *arg = (unsigned long)flow;
324         return 0;
325 err_out:
326         if (excess)
327                 atm_tc_put(sch, (unsigned long)excess);
328         sockfd_put(sock);
329         return error;
330 }
331
332 static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
333 {
334         struct atm_qdisc_data *p = PRIV(sch);
335         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
336
337         DPRINTK("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
338         if (!find_flow(PRIV(sch), flow))
339                 return -EINVAL;
340         if (flow->filter_list || flow == &p->link)
341                 return -EBUSY;
342         /*
343          * Reference count must be 2: one for "keepalive" (set at class
344          * creation), and one for the reference held when calling delete.
345          */
346         if (flow->ref < 2) {
347                 printk(KERN_ERR "atm_tc_delete: flow->ref == %d\n", flow->ref);
348                 return -EINVAL;
349         }
350         if (flow->ref > 2)
351                 return -EBUSY;  /* catch references via excess, etc. */
352         atm_tc_put(sch, arg);
353         return 0;
354 }
355
356 static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
357 {
358         struct atm_qdisc_data *p = PRIV(sch);
359         struct atm_flow_data *flow;
360
361         DPRINTK("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
362         if (walker->stop)
363                 return;
364         for (flow = p->flows; flow; flow = flow->next) {
365                 if (walker->count >= walker->skip)
366                         if (walker->fn(sch, (unsigned long)flow, walker) < 0) {
367                                 walker->stop = 1;
368                                 break;
369                         }
370                 walker->count++;
371         }
372 }
373
374 static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
375 {
376         struct atm_qdisc_data *p = PRIV(sch);
377         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
378
379         DPRINTK("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
380         return flow ? &flow->filter_list : &p->link.filter_list;
381 }
382
383 /* --------------------------- Qdisc operations ---------------------------- */
384
385 static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
386 {
387         struct atm_qdisc_data *p = PRIV(sch);
388         struct atm_flow_data *flow = NULL;      /* @@@ */
389         struct tcf_result res;
390         int result;
391         int ret = NET_XMIT_POLICED;
392
393         D2PRINTK("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
394         result = TC_POLICE_OK;  /* be nice to gcc */
395         if (TC_H_MAJ(skb->priority) != sch->handle ||
396             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority)))
397                 for (flow = p->flows; flow; flow = flow->next)
398                         if (flow->filter_list) {
399                                 result = tc_classify_compat(skb,
400                                                             flow->filter_list,
401                                                             &res);
402                                 if (result < 0)
403                                         continue;
404                                 flow = (struct atm_flow_data *)res.class;
405                                 if (!flow)
406                                         flow = lookup_flow(sch, res.classid);
407                                 break;
408                         }
409         if (!flow)
410                 flow = &p->link;
411         else {
412                 if (flow->vcc)
413                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
414                 /*@@@ looks good ... but it's not supposed to work :-) */
415 #ifdef CONFIG_NET_CLS_ACT
416                 switch (result) {
417                 case TC_ACT_QUEUED:
418                 case TC_ACT_STOLEN:
419                         kfree_skb(skb);
420                         return NET_XMIT_SUCCESS;
421                 case TC_ACT_SHOT:
422                         kfree_skb(skb);
423                         goto drop;
424                 case TC_POLICE_RECLASSIFY:
425                         if (flow->excess)
426                                 flow = flow->excess;
427                         else
428                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
429                         break;
430                 }
431 #endif
432         }
433
434         if ((ret = flow->q->enqueue(skb, flow->q)) != 0) {
435 drop: __maybe_unused
436                 sch->qstats.drops++;
437                 if (flow)
438                         flow->qstats.drops++;
439                 return ret;
440         }
441         sch->bstats.bytes += skb->len;
442         sch->bstats.packets++;
443         flow->bstats.bytes += skb->len;
444         flow->bstats.packets++;
445         /*
446          * Okay, this may seem weird. We pretend we've dropped the packet if
447          * it goes via ATM. The reason for this is that the outer qdisc
448          * expects to be able to q->dequeue the packet later on if we return
449          * success at this place. Also, sch->q.qdisc needs to reflect whether
450          * there is a packet egligible for dequeuing or not. Note that the
451          * statistics of the outer qdisc are necessarily wrong because of all
452          * this. There's currently no correct solution for this.
453          */
454         if (flow == &p->link) {
455                 sch->q.qlen++;
456                 return 0;
457         }
458         tasklet_schedule(&p->task);
459         return NET_XMIT_BYPASS;
460 }
461
462 /*
463  * Dequeue packets and send them over ATM. Note that we quite deliberately
464  * avoid checking net_device's flow control here, simply because sch_atm
465  * uses its own channels, which have nothing to do with any CLIP/LANE/or
466  * non-ATM interfaces.
467  */
468
469 static void sch_atm_dequeue(unsigned long data)
470 {
471         struct Qdisc *sch = (struct Qdisc *)data;
472         struct atm_qdisc_data *p = PRIV(sch);
473         struct atm_flow_data *flow;
474         struct sk_buff *skb;
475
476         D2PRINTK("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
477         for (flow = p->link.next; flow; flow = flow->next)
478                 /*
479                  * If traffic is properly shaped, this won't generate nasty
480                  * little bursts. Otherwise, it may ... (but that's okay)
481                  */
482                 while ((skb = flow->q->dequeue(flow->q))) {
483                         if (!atm_may_send(flow->vcc, skb->truesize)) {
484                                 (void)flow->q->ops->requeue(skb, flow->q);
485                                 break;
486                         }
487                         D2PRINTK("atm_tc_dequeue: sending on class %p\n", flow);
488                         /* remove any LL header somebody else has attached */
489                         skb_pull(skb, skb_network_offset(skb));
490                         if (skb_headroom(skb) < flow->hdr_len) {
491                                 struct sk_buff *new;
492
493                                 new = skb_realloc_headroom(skb, flow->hdr_len);
494                                 dev_kfree_skb(skb);
495                                 if (!new)
496                                         continue;
497                                 skb = new;
498                         }
499                         D2PRINTK("sch_atm_dequeue: ip %p, data %p\n",
500                                  skb_network_header(skb), skb->data);
501                         ATM_SKB(skb)->vcc = flow->vcc;
502                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
503                                flow->hdr_len);
504                         atomic_add(skb->truesize,
505                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
506                         /* atm.atm_options are already set by atm_tc_enqueue */
507                         flow->vcc->send(flow->vcc, skb);
508                 }
509 }
510
511 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
512 {
513         struct atm_qdisc_data *p = PRIV(sch);
514         struct sk_buff *skb;
515
516         D2PRINTK("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
517         tasklet_schedule(&p->task);
518         skb = p->link.q->dequeue(p->link.q);
519         if (skb)
520                 sch->q.qlen--;
521         return skb;
522 }
523
524 static int atm_tc_requeue(struct sk_buff *skb, struct Qdisc *sch)
525 {
526         struct atm_qdisc_data *p = PRIV(sch);
527         int ret;
528
529         D2PRINTK("atm_tc_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
530         ret = p->link.q->ops->requeue(skb, p->link.q);
531         if (!ret) {
532                 sch->q.qlen++;
533                 sch->qstats.requeues++;
534         } else {
535                 sch->qstats.drops++;
536                 p->link.qstats.drops++;
537         }
538         return ret;
539 }
540
541 static unsigned int atm_tc_drop(struct Qdisc *sch)
542 {
543         struct atm_qdisc_data *p = PRIV(sch);
544         struct atm_flow_data *flow;
545         unsigned int len;
546
547         DPRINTK("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
548         for (flow = p->flows; flow; flow = flow->next)
549                 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
550                         return len;
551         return 0;
552 }
553
554 static int atm_tc_init(struct Qdisc *sch, struct rtattr *opt)
555 {
556         struct atm_qdisc_data *p = PRIV(sch);
557
558         DPRINTK("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
559         p->flows = &p->link;
560         if (!(p->link.q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
561                                             sch->handle)))
562                 p->link.q = &noop_qdisc;
563         DPRINTK("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
564         p->link.filter_list = NULL;
565         p->link.vcc = NULL;
566         p->link.sock = NULL;
567         p->link.classid = sch->handle;
568         p->link.ref = 1;
569         p->link.next = NULL;
570         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
571         return 0;
572 }
573
574 static void atm_tc_reset(struct Qdisc *sch)
575 {
576         struct atm_qdisc_data *p = PRIV(sch);
577         struct atm_flow_data *flow;
578
579         DPRINTK("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
580         for (flow = p->flows; flow; flow = flow->next)
581                 qdisc_reset(flow->q);
582         sch->q.qlen = 0;
583 }
584
585 static void atm_tc_destroy(struct Qdisc *sch)
586 {
587         struct atm_qdisc_data *p = PRIV(sch);
588         struct atm_flow_data *flow;
589
590         DPRINTK("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
591         /* races ? */
592         while ((flow = p->flows)) {
593                 tcf_destroy_chain(flow->filter_list);
594                 flow->filter_list = NULL;
595                 if (flow->ref > 1)
596                         printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
597                                flow->ref);
598                 atm_tc_put(sch, (unsigned long)flow);
599                 if (p->flows == flow) {
600                         printk(KERN_ERR "atm_destroy: putting flow %p didn't "
601                                "kill it\n", flow);
602                         p->flows = flow->next;  /* brute force */
603                         break;
604                 }
605         }
606         tasklet_kill(&p->task);
607 }
608
609 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
610                              struct sk_buff *skb, struct tcmsg *tcm)
611 {
612         struct atm_qdisc_data *p = PRIV(sch);
613         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
614         unsigned char *b = skb_tail_pointer(skb);
615         struct rtattr *rta;
616
617         DPRINTK("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
618                 sch, p, flow, skb, tcm);
619         if (!find_flow(p, flow))
620                 return -EINVAL;
621         tcm->tcm_handle = flow->classid;
622         tcm->tcm_info = flow->q->handle;
623         rta = (struct rtattr *)b;
624         RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
625         RTA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
626         if (flow->vcc) {
627                 struct sockaddr_atmpvc pvc;
628                 int state;
629
630                 pvc.sap_family = AF_ATMPVC;
631                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
632                 pvc.sap_addr.vpi = flow->vcc->vpi;
633                 pvc.sap_addr.vci = flow->vcc->vci;
634                 RTA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
635                 state = ATM_VF2VS(flow->vcc->flags);
636                 RTA_PUT(skb, TCA_ATM_STATE, sizeof(state), &state);
637         }
638         if (flow->excess)
639                 RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(u32), &flow->classid);
640         else {
641                 static u32 zero;
642
643                 RTA_PUT(skb, TCA_ATM_EXCESS, sizeof(zero), &zero);
644         }
645         rta->rta_len = skb_tail_pointer(skb) - b;
646         return skb->len;
647
648 rtattr_failure:
649         nlmsg_trim(skb, b);
650         return -1;
651 }
652 static int
653 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
654                         struct gnet_dump *d)
655 {
656         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
657
658         flow->qstats.qlen = flow->q->q.qlen;
659
660         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
661             gnet_stats_copy_queue(d, &flow->qstats) < 0)
662                 return -1;
663
664         return 0;
665 }
666
667 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
668 {
669         return 0;
670 }
671
672 static struct Qdisc_class_ops atm_class_ops = {
673         .graft          = atm_tc_graft,
674         .leaf           = atm_tc_leaf,
675         .get            = atm_tc_get,
676         .put            = atm_tc_put,
677         .change         = atm_tc_change,
678         .delete         = atm_tc_delete,
679         .walk           = atm_tc_walk,
680         .tcf_chain      = atm_tc_find_tcf,
681         .bind_tcf       = atm_tc_bind_filter,
682         .unbind_tcf     = atm_tc_put,
683         .dump           = atm_tc_dump_class,
684         .dump_stats     = atm_tc_dump_class_stats,
685 };
686
687 static struct Qdisc_ops atm_qdisc_ops = {
688         .cl_ops         = &atm_class_ops,
689         .id             = "atm",
690         .priv_size      = sizeof(struct atm_qdisc_data),
691         .enqueue        = atm_tc_enqueue,
692         .dequeue        = atm_tc_dequeue,
693         .requeue        = atm_tc_requeue,
694         .drop           = atm_tc_drop,
695         .init           = atm_tc_init,
696         .reset          = atm_tc_reset,
697         .destroy        = atm_tc_destroy,
698         .dump           = atm_tc_dump,
699         .owner          = THIS_MODULE,
700 };
701
702 static int __init atm_init(void)
703 {
704         return register_qdisc(&atm_qdisc_ops);
705 }
706
707 static void __exit atm_exit(void)
708 {
709         unregister_qdisc(&atm_qdisc_ops);
710 }
711
712 module_init(atm_init)
713 module_exit(atm_exit)
714 MODULE_LICENSE("GPL");