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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/interrupt.h>
9#include <linux/string.h>
10#include <linux/errno.h>
11#include <linux/skbuff.h>
12#include <linux/atmdev.h>
13#include <linux/atmclip.h>
14#include <linux/rtnetlink.h>
15#include <linux/file.h> /* for fput */
16#include <net/netlink.h>
17#include <net/pkt_sched.h>
18
19extern struct socket *sockfd_lookup(int fd, int *err); /* @@@ fix this */
20
21/*
22 * The ATM queuing discipline provides a framework for invoking classifiers
23 * (aka "filters"), which in turn select classes of this queuing discipline.
24 * Each class maps the flow(s) it is handling to a given VC. Multiple classes
25 * may share the same VC.
26 *
27 * When creating a class, VCs are specified by passing the number of the open
28 * socket descriptor by which the calling process references the VC. The kernel
29 * keeps the VC open at least until all classes using it are removed.
30 *
31 * In this file, most functions are named atm_tc_* to avoid confusion with all
32 * the atm_* in net/atm. This naming convention differs from what's used in the
33 * rest of net/sched.
34 *
35 * Known bugs:
36 * - sometimes messes up the IP stack
37 * - any manipulations besides the few operations described in the README, are
38 * untested and likely to crash the system
39 * - should lock the flow while there is data in the queue (?)
40 */
41
42#define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
43
44struct atm_flow_data {
45 struct Qdisc *q; /* FIFO, TBF, etc. */
46 struct tcf_proto *filter_list;
47 struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */
48 void (*old_pop)(struct atm_vcc *vcc,
49 struct sk_buff *skb); /* chaining */
50 struct atm_qdisc_data *parent; /* parent qdisc */
51 struct socket *sock; /* for closing */
52 u32 classid; /* x:y type ID */
53 int ref; /* reference count */
54 struct gnet_stats_basic_packed bstats;
55 struct gnet_stats_queue qstats;
56 struct list_head list;
57 struct atm_flow_data *excess; /* flow for excess traffic;
58 NULL to set CLP instead */
59 int hdr_len;
60 unsigned char hdr[0]; /* header data; MUST BE LAST */
61};
62
63struct atm_qdisc_data {
64 struct atm_flow_data link; /* unclassified skbs go here */
65 struct list_head flows; /* NB: "link" is also on this
66 list */
67 struct tasklet_struct task; /* dequeue tasklet */
68};
69
70/* ------------------------- Class/flow operations ------------------------- */
71
72static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
73{
74 struct atm_qdisc_data *p = qdisc_priv(sch);
75 struct atm_flow_data *flow;
76
77 list_for_each_entry(flow, &p->flows, list) {
78 if (flow->classid == classid)
79 return flow;
80 }
81 return NULL;
82}
83
84static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
85 struct Qdisc *new, struct Qdisc **old)
86{
87 struct atm_qdisc_data *p = qdisc_priv(sch);
88 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
89
90 pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
91 sch, p, flow, new, old);
92 if (list_empty(&flow->list))
93 return -EINVAL;
94 if (!new)
95 new = &noop_qdisc;
96 *old = flow->q;
97 flow->q = new;
98 if (*old)
99 qdisc_reset(*old);
100 return 0;
101}
102
103static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
104{
105 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
106
107 pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
108 return flow ? flow->q : NULL;
109}
110
111static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
112{
113 struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
114 struct atm_flow_data *flow;
115
116 pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
117 flow = lookup_flow(sch, classid);
118 if (flow)
119 flow->ref++;
120 pr_debug("atm_tc_get: flow %p\n", flow);
121 return (unsigned long)flow;
122}
123
124static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
125 unsigned long parent, u32 classid)
126{
127 return atm_tc_get(sch, classid);
128}
129
130/*
131 * atm_tc_put handles all destructions, including the ones that are explicitly
132 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
133 * anything that still seems to be in use.
134 */
135static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
136{
137 struct atm_qdisc_data *p = qdisc_priv(sch);
138 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
139
140 pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
141 if (--flow->ref)
142 return;
143 pr_debug("atm_tc_put: destroying\n");
144 list_del_init(&flow->list);
145 pr_debug("atm_tc_put: qdisc %p\n", flow->q);
146 qdisc_destroy(flow->q);
147 tcf_destroy_chain(&flow->filter_list);
148 if (flow->sock) {
149 pr_debug("atm_tc_put: f_count %ld\n",
150 file_count(flow->sock->file));
151 flow->vcc->pop = flow->old_pop;
152 sockfd_put(flow->sock);
153 }
154 if (flow->excess)
155 atm_tc_put(sch, (unsigned long)flow->excess);
156 if (flow != &p->link)
157 kfree(flow);
158 /*
159 * If flow == &p->link, the qdisc no longer works at this point and
160 * needs to be removed. (By the caller of atm_tc_put.)
161 */
162}
163
164static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
165{
166 struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
167
168 pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
169 VCC2FLOW(vcc)->old_pop(vcc, skb);
170 tasklet_schedule(&p->task);
171}
172
173static const u8 llc_oui_ip[] = {
174 0xaa, /* DSAP: non-ISO */
175 0xaa, /* SSAP: non-ISO */
176 0x03, /* Ctrl: Unnumbered Information Command PDU */
177 0x00, /* OUI: EtherType */
178 0x00, 0x00,
179 0x08, 0x00
180}; /* Ethertype IP (0800) */
181
182static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
183 [TCA_ATM_FD] = { .type = NLA_U32 },
184 [TCA_ATM_EXCESS] = { .type = NLA_U32 },
185};
186
187static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
188 struct nlattr **tca, unsigned long *arg)
189{
190 struct atm_qdisc_data *p = qdisc_priv(sch);
191 struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
192 struct atm_flow_data *excess = NULL;
193 struct nlattr *opt = tca[TCA_OPTIONS];
194 struct nlattr *tb[TCA_ATM_MAX + 1];
195 struct socket *sock;
196 int fd, error, hdr_len;
197 void *hdr;
198
199 pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
200 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
201 /*
202 * The concept of parents doesn't apply for this qdisc.
203 */
204 if (parent && parent != TC_H_ROOT && parent != sch->handle)
205 return -EINVAL;
206 /*
207 * ATM classes cannot be changed. In order to change properties of the
208 * ATM connection, that socket needs to be modified directly (via the
209 * native ATM API. In order to send a flow to a different VC, the old
210 * class needs to be removed and a new one added. (This may be changed
211 * later.)
212 */
213 if (flow)
214 return -EBUSY;
215 if (opt == NULL)
216 return -EINVAL;
217
218 error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
219 if (error < 0)
220 return error;
221
222 if (!tb[TCA_ATM_FD])
223 return -EINVAL;
224 fd = nla_get_u32(tb[TCA_ATM_FD]);
225 pr_debug("atm_tc_change: fd %d\n", fd);
226 if (tb[TCA_ATM_HDR]) {
227 hdr_len = nla_len(tb[TCA_ATM_HDR]);
228 hdr = nla_data(tb[TCA_ATM_HDR]);
229 } else {
230 hdr_len = RFC1483LLC_LEN;
231 hdr = NULL; /* default LLC/SNAP for IP */
232 }
233 if (!tb[TCA_ATM_EXCESS])
234 excess = NULL;
235 else {
236 excess = (struct atm_flow_data *)
237 atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
238 if (!excess)
239 return -ENOENT;
240 }
241 pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
242 opt->nla_type, nla_len(opt), hdr_len);
243 sock = sockfd_lookup(fd, &error);
244 if (!sock)
245 return error; /* f_count++ */
246 pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
247 if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
248 error = -EPROTOTYPE;
249 goto err_out;
250 }
251 /* @@@ should check if the socket is really operational or we'll crash
252 on vcc->send */
253 if (classid) {
254 if (TC_H_MAJ(classid ^ sch->handle)) {
255 pr_debug("atm_tc_change: classid mismatch\n");
256 error = -EINVAL;
257 goto err_out;
258 }
259 } else {
260 int i;
261 unsigned long cl;
262
263 for (i = 1; i < 0x8000; i++) {
264 classid = TC_H_MAKE(sch->handle, 0x8000 | i);
265 cl = atm_tc_get(sch, classid);
266 if (!cl)
267 break;
268 atm_tc_put(sch, cl);
269 }
270 }
271 pr_debug("atm_tc_change: new id %x\n", classid);
272 flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
273 pr_debug("atm_tc_change: flow %p\n", flow);
274 if (!flow) {
275 error = -ENOBUFS;
276 goto err_out;
277 }
278 flow->filter_list = NULL;
279 flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
280 if (!flow->q)
281 flow->q = &noop_qdisc;
282 pr_debug("atm_tc_change: qdisc %p\n", flow->q);
283 flow->sock = sock;
284 flow->vcc = ATM_SD(sock); /* speedup */
285 flow->vcc->user_back = flow;
286 pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
287 flow->old_pop = flow->vcc->pop;
288 flow->parent = p;
289 flow->vcc->pop = sch_atm_pop;
290 flow->classid = classid;
291 flow->ref = 1;
292 flow->excess = excess;
293 list_add(&flow->list, &p->link.list);
294 flow->hdr_len = hdr_len;
295 if (hdr)
296 memcpy(flow->hdr, hdr, hdr_len);
297 else
298 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
299 *arg = (unsigned long)flow;
300 return 0;
301err_out:
302 if (excess)
303 atm_tc_put(sch, (unsigned long)excess);
304 sockfd_put(sock);
305 return error;
306}
307
308static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
309{
310 struct atm_qdisc_data *p = qdisc_priv(sch);
311 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
312
313 pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
314 if (list_empty(&flow->list))
315 return -EINVAL;
316 if (flow->filter_list || flow == &p->link)
317 return -EBUSY;
318 /*
319 * Reference count must be 2: one for "keepalive" (set at class
320 * creation), and one for the reference held when calling delete.
321 */
322 if (flow->ref < 2) {
323 pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
324 return -EINVAL;
325 }
326 if (flow->ref > 2)
327 return -EBUSY; /* catch references via excess, etc. */
328 atm_tc_put(sch, arg);
329 return 0;
330}
331
332static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
333{
334 struct atm_qdisc_data *p = qdisc_priv(sch);
335 struct atm_flow_data *flow;
336
337 pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
338 if (walker->stop)
339 return;
340 list_for_each_entry(flow, &p->flows, list) {
341 if (walker->count >= walker->skip &&
342 walker->fn(sch, (unsigned long)flow, walker) < 0) {
343 walker->stop = 1;
344 break;
345 }
346 walker->count++;
347 }
348}
349
350static struct tcf_proto **atm_tc_find_tcf(struct Qdisc *sch, unsigned long cl)
351{
352 struct atm_qdisc_data *p = qdisc_priv(sch);
353 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
354
355 pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
356 return flow ? &flow->filter_list : &p->link.filter_list;
357}
358
359/* --------------------------- Qdisc operations ---------------------------- */
360
361static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch)
362{
363 struct atm_qdisc_data *p = qdisc_priv(sch);
364 struct atm_flow_data *flow;
365 struct tcf_result res;
366 int result;
367 int ret = NET_XMIT_POLICED;
368
369 pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
370 result = TC_POLICE_OK; /* be nice to gcc */
371 flow = NULL;
372 if (TC_H_MAJ(skb->priority) != sch->handle ||
373 !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
374 list_for_each_entry(flow, &p->flows, list) {
375 if (flow->filter_list) {
376 result = tc_classify_compat(skb,
377 flow->filter_list,
378 &res);
379 if (result < 0)
380 continue;
381 flow = (struct atm_flow_data *)res.class;
382 if (!flow)
383 flow = lookup_flow(sch, res.classid);
384 goto done;
385 }
386 }
387 flow = NULL;
388done:
389 ;
390 }
391 if (!flow) {
392 flow = &p->link;
393 } else {
394 if (flow->vcc)
395 ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
396 /*@@@ looks good ... but it's not supposed to work :-) */
397#ifdef CONFIG_NET_CLS_ACT
398 switch (result) {
399 case TC_ACT_QUEUED:
400 case TC_ACT_STOLEN:
401 kfree_skb(skb);
402 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
403 case TC_ACT_SHOT:
404 kfree_skb(skb);
405 goto drop;
406 case TC_POLICE_RECLASSIFY:
407 if (flow->excess)
408 flow = flow->excess;
409 else
410 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
411 break;
412 }
413#endif
414 }
415
416 ret = qdisc_enqueue(skb, flow->q);
417 if (ret != NET_XMIT_SUCCESS) {
418drop: __maybe_unused
419 if (net_xmit_drop_count(ret)) {
420 sch->qstats.drops++;
421 if (flow)
422 flow->qstats.drops++;
423 }
424 return ret;
425 }
426 qdisc_bstats_update(sch, skb);
427 bstats_update(&flow->bstats, skb);
428 /*
429 * Okay, this may seem weird. We pretend we've dropped the packet if
430 * it goes via ATM. The reason for this is that the outer qdisc
431 * expects to be able to q->dequeue the packet later on if we return
432 * success at this place. Also, sch->q.qdisc needs to reflect whether
433 * there is a packet egligible for dequeuing or not. Note that the
434 * statistics of the outer qdisc are necessarily wrong because of all
435 * this. There's currently no correct solution for this.
436 */
437 if (flow == &p->link) {
438 sch->q.qlen++;
439 return NET_XMIT_SUCCESS;
440 }
441 tasklet_schedule(&p->task);
442 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
443}
444
445/*
446 * Dequeue packets and send them over ATM. Note that we quite deliberately
447 * avoid checking net_device's flow control here, simply because sch_atm
448 * uses its own channels, which have nothing to do with any CLIP/LANE/or
449 * non-ATM interfaces.
450 */
451
452static void sch_atm_dequeue(unsigned long data)
453{
454 struct Qdisc *sch = (struct Qdisc *)data;
455 struct atm_qdisc_data *p = qdisc_priv(sch);
456 struct atm_flow_data *flow;
457 struct sk_buff *skb;
458
459 pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
460 list_for_each_entry(flow, &p->flows, list) {
461 if (flow == &p->link)
462 continue;
463 /*
464 * If traffic is properly shaped, this won't generate nasty
465 * little bursts. Otherwise, it may ... (but that's okay)
466 */
467 while ((skb = flow->q->ops->peek(flow->q))) {
468 if (!atm_may_send(flow->vcc, skb->truesize))
469 break;
470
471 skb = qdisc_dequeue_peeked(flow->q);
472 if (unlikely(!skb))
473 break;
474
475 pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
476 /* remove any LL header somebody else has attached */
477 skb_pull(skb, skb_network_offset(skb));
478 if (skb_headroom(skb) < flow->hdr_len) {
479 struct sk_buff *new;
480
481 new = skb_realloc_headroom(skb, flow->hdr_len);
482 dev_kfree_skb(skb);
483 if (!new)
484 continue;
485 skb = new;
486 }
487 pr_debug("sch_atm_dequeue: ip %p, data %p\n",
488 skb_network_header(skb), skb->data);
489 ATM_SKB(skb)->vcc = flow->vcc;
490 memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
491 flow->hdr_len);
492 atomic_add(skb->truesize,
493 &sk_atm(flow->vcc)->sk_wmem_alloc);
494 /* atm.atm_options are already set by atm_tc_enqueue */
495 flow->vcc->send(flow->vcc, skb);
496 }
497 }
498}
499
500static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
501{
502 struct atm_qdisc_data *p = qdisc_priv(sch);
503 struct sk_buff *skb;
504
505 pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
506 tasklet_schedule(&p->task);
507 skb = qdisc_dequeue_peeked(p->link.q);
508 if (skb)
509 sch->q.qlen--;
510 return skb;
511}
512
513static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
514{
515 struct atm_qdisc_data *p = qdisc_priv(sch);
516
517 pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
518
519 return p->link.q->ops->peek(p->link.q);
520}
521
522static unsigned int atm_tc_drop(struct Qdisc *sch)
523{
524 struct atm_qdisc_data *p = qdisc_priv(sch);
525 struct atm_flow_data *flow;
526 unsigned int len;
527
528 pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
529 list_for_each_entry(flow, &p->flows, list) {
530 if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
531 return len;
532 }
533 return 0;
534}
535
536static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
537{
538 struct atm_qdisc_data *p = qdisc_priv(sch);
539
540 pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
541 INIT_LIST_HEAD(&p->flows);
542 INIT_LIST_HEAD(&p->link.list);
543 list_add(&p->link.list, &p->flows);
544 p->link.q = qdisc_create_dflt(sch->dev_queue,
545 &pfifo_qdisc_ops, sch->handle);
546 if (!p->link.q)
547 p->link.q = &noop_qdisc;
548 pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
549 p->link.filter_list = NULL;
550 p->link.vcc = NULL;
551 p->link.sock = NULL;
552 p->link.classid = sch->handle;
553 p->link.ref = 1;
554 tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
555 return 0;
556}
557
558static void atm_tc_reset(struct Qdisc *sch)
559{
560 struct atm_qdisc_data *p = qdisc_priv(sch);
561 struct atm_flow_data *flow;
562
563 pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
564 list_for_each_entry(flow, &p->flows, list)
565 qdisc_reset(flow->q);
566 sch->q.qlen = 0;
567}
568
569static void atm_tc_destroy(struct Qdisc *sch)
570{
571 struct atm_qdisc_data *p = qdisc_priv(sch);
572 struct atm_flow_data *flow, *tmp;
573
574 pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
575 list_for_each_entry(flow, &p->flows, list)
576 tcf_destroy_chain(&flow->filter_list);
577
578 list_for_each_entry_safe(flow, tmp, &p->flows, list) {
579 if (flow->ref > 1)
580 pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
581 atm_tc_put(sch, (unsigned long)flow);
582 }
583 tasklet_kill(&p->task);
584}
585
586static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
587 struct sk_buff *skb, struct tcmsg *tcm)
588{
589 struct atm_qdisc_data *p = qdisc_priv(sch);
590 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
591 struct nlattr *nest;
592
593 pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
594 sch, p, flow, skb, tcm);
595 if (list_empty(&flow->list))
596 return -EINVAL;
597 tcm->tcm_handle = flow->classid;
598 tcm->tcm_info = flow->q->handle;
599
600 nest = nla_nest_start(skb, TCA_OPTIONS);
601 if (nest == NULL)
602 goto nla_put_failure;
603
604 NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
605 if (flow->vcc) {
606 struct sockaddr_atmpvc pvc;
607 int state;
608
609 pvc.sap_family = AF_ATMPVC;
610 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
611 pvc.sap_addr.vpi = flow->vcc->vpi;
612 pvc.sap_addr.vci = flow->vcc->vci;
613 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
614 state = ATM_VF2VS(flow->vcc->flags);
615 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
616 }
617 if (flow->excess)
618 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
619 else
620 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
621
622 nla_nest_end(skb, nest);
623 return skb->len;
624
625nla_put_failure:
626 nla_nest_cancel(skb, nest);
627 return -1;
628}
629static int
630atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
631 struct gnet_dump *d)
632{
633 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
634
635 flow->qstats.qlen = flow->q->q.qlen;
636
637 if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
638 gnet_stats_copy_queue(d, &flow->qstats) < 0)
639 return -1;
640
641 return 0;
642}
643
644static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
645{
646 return 0;
647}
648
649static const struct Qdisc_class_ops atm_class_ops = {
650 .graft = atm_tc_graft,
651 .leaf = atm_tc_leaf,
652 .get = atm_tc_get,
653 .put = atm_tc_put,
654 .change = atm_tc_change,
655 .delete = atm_tc_delete,
656 .walk = atm_tc_walk,
657 .tcf_chain = atm_tc_find_tcf,
658 .bind_tcf = atm_tc_bind_filter,
659 .unbind_tcf = atm_tc_put,
660 .dump = atm_tc_dump_class,
661 .dump_stats = atm_tc_dump_class_stats,
662};
663
664static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
665 .cl_ops = &atm_class_ops,
666 .id = "atm",
667 .priv_size = sizeof(struct atm_qdisc_data),
668 .enqueue = atm_tc_enqueue,
669 .dequeue = atm_tc_dequeue,
670 .peek = atm_tc_peek,
671 .drop = atm_tc_drop,
672 .init = atm_tc_init,
673 .reset = atm_tc_reset,
674 .destroy = atm_tc_destroy,
675 .dump = atm_tc_dump,
676 .owner = THIS_MODULE,
677};
678
679static int __init atm_init(void)
680{
681 return register_qdisc(&atm_qdisc_ops);
682}
683
684static void __exit atm_exit(void)
685{
686 unregister_qdisc(&atm_qdisc_ops);
687}
688
689module_init(atm_init)
690module_exit(atm_exit)
691MODULE_LICENSE("GPL");
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/interrupt.h>
9#include <linux/string.h>
10#include <linux/errno.h>
11#include <linux/skbuff.h>
12#include <linux/atmdev.h>
13#include <linux/atmclip.h>
14#include <linux/rtnetlink.h>
15#include <linux/file.h> /* for fput */
16#include <net/netlink.h>
17#include <net/pkt_sched.h>
18
19/*
20 * The ATM queuing discipline provides a framework for invoking classifiers
21 * (aka "filters"), which in turn select classes of this queuing discipline.
22 * Each class maps the flow(s) it is handling to a given VC. Multiple classes
23 * may share the same VC.
24 *
25 * When creating a class, VCs are specified by passing the number of the open
26 * socket descriptor by which the calling process references the VC. The kernel
27 * keeps the VC open at least until all classes using it are removed.
28 *
29 * In this file, most functions are named atm_tc_* to avoid confusion with all
30 * the atm_* in net/atm. This naming convention differs from what's used in the
31 * rest of net/sched.
32 *
33 * Known bugs:
34 * - sometimes messes up the IP stack
35 * - any manipulations besides the few operations described in the README, are
36 * untested and likely to crash the system
37 * - should lock the flow while there is data in the queue (?)
38 */
39
40#define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
41
42struct atm_flow_data {
43 struct Qdisc *q; /* FIFO, TBF, etc. */
44 struct tcf_proto __rcu *filter_list;
45 struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */
46 void (*old_pop)(struct atm_vcc *vcc,
47 struct sk_buff *skb); /* chaining */
48 struct atm_qdisc_data *parent; /* parent qdisc */
49 struct socket *sock; /* for closing */
50 u32 classid; /* x:y type ID */
51 int ref; /* reference count */
52 struct gnet_stats_basic_packed bstats;
53 struct gnet_stats_queue qstats;
54 struct list_head list;
55 struct atm_flow_data *excess; /* flow for excess traffic;
56 NULL to set CLP instead */
57 int hdr_len;
58 unsigned char hdr[0]; /* header data; MUST BE LAST */
59};
60
61struct atm_qdisc_data {
62 struct atm_flow_data link; /* unclassified skbs go here */
63 struct list_head flows; /* NB: "link" is also on this
64 list */
65 struct tasklet_struct task; /* dequeue tasklet */
66};
67
68/* ------------------------- Class/flow operations ------------------------- */
69
70static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
71{
72 struct atm_qdisc_data *p = qdisc_priv(sch);
73 struct atm_flow_data *flow;
74
75 list_for_each_entry(flow, &p->flows, list) {
76 if (flow->classid == classid)
77 return flow;
78 }
79 return NULL;
80}
81
82static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
83 struct Qdisc *new, struct Qdisc **old)
84{
85 struct atm_qdisc_data *p = qdisc_priv(sch);
86 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
87
88 pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
89 sch, p, flow, new, old);
90 if (list_empty(&flow->list))
91 return -EINVAL;
92 if (!new)
93 new = &noop_qdisc;
94 *old = flow->q;
95 flow->q = new;
96 if (*old)
97 qdisc_reset(*old);
98 return 0;
99}
100
101static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
102{
103 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
104
105 pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
106 return flow ? flow->q : NULL;
107}
108
109static unsigned long atm_tc_get(struct Qdisc *sch, u32 classid)
110{
111 struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
112 struct atm_flow_data *flow;
113
114 pr_debug("atm_tc_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
115 flow = lookup_flow(sch, classid);
116 if (flow)
117 flow->ref++;
118 pr_debug("atm_tc_get: flow %p\n", flow);
119 return (unsigned long)flow;
120}
121
122static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
123 unsigned long parent, u32 classid)
124{
125 return atm_tc_get(sch, classid);
126}
127
128/*
129 * atm_tc_put handles all destructions, including the ones that are explicitly
130 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
131 * anything that still seems to be in use.
132 */
133static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
134{
135 struct atm_qdisc_data *p = qdisc_priv(sch);
136 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
137
138 pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
139 if (--flow->ref)
140 return;
141 pr_debug("atm_tc_put: destroying\n");
142 list_del_init(&flow->list);
143 pr_debug("atm_tc_put: qdisc %p\n", flow->q);
144 qdisc_destroy(flow->q);
145 tcf_destroy_chain(&flow->filter_list);
146 if (flow->sock) {
147 pr_debug("atm_tc_put: f_count %ld\n",
148 file_count(flow->sock->file));
149 flow->vcc->pop = flow->old_pop;
150 sockfd_put(flow->sock);
151 }
152 if (flow->excess)
153 atm_tc_put(sch, (unsigned long)flow->excess);
154 if (flow != &p->link)
155 kfree(flow);
156 /*
157 * If flow == &p->link, the qdisc no longer works at this point and
158 * needs to be removed. (By the caller of atm_tc_put.)
159 */
160}
161
162static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
163{
164 struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
165
166 pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
167 VCC2FLOW(vcc)->old_pop(vcc, skb);
168 tasklet_schedule(&p->task);
169}
170
171static const u8 llc_oui_ip[] = {
172 0xaa, /* DSAP: non-ISO */
173 0xaa, /* SSAP: non-ISO */
174 0x03, /* Ctrl: Unnumbered Information Command PDU */
175 0x00, /* OUI: EtherType */
176 0x00, 0x00,
177 0x08, 0x00
178}; /* Ethertype IP (0800) */
179
180static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
181 [TCA_ATM_FD] = { .type = NLA_U32 },
182 [TCA_ATM_EXCESS] = { .type = NLA_U32 },
183};
184
185static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
186 struct nlattr **tca, unsigned long *arg)
187{
188 struct atm_qdisc_data *p = qdisc_priv(sch);
189 struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
190 struct atm_flow_data *excess = NULL;
191 struct nlattr *opt = tca[TCA_OPTIONS];
192 struct nlattr *tb[TCA_ATM_MAX + 1];
193 struct socket *sock;
194 int fd, error, hdr_len;
195 void *hdr;
196
197 pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
198 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
199 /*
200 * The concept of parents doesn't apply for this qdisc.
201 */
202 if (parent && parent != TC_H_ROOT && parent != sch->handle)
203 return -EINVAL;
204 /*
205 * ATM classes cannot be changed. In order to change properties of the
206 * ATM connection, that socket needs to be modified directly (via the
207 * native ATM API. In order to send a flow to a different VC, the old
208 * class needs to be removed and a new one added. (This may be changed
209 * later.)
210 */
211 if (flow)
212 return -EBUSY;
213 if (opt == NULL)
214 return -EINVAL;
215
216 error = nla_parse_nested(tb, TCA_ATM_MAX, opt, atm_policy);
217 if (error < 0)
218 return error;
219
220 if (!tb[TCA_ATM_FD])
221 return -EINVAL;
222 fd = nla_get_u32(tb[TCA_ATM_FD]);
223 pr_debug("atm_tc_change: fd %d\n", fd);
224 if (tb[TCA_ATM_HDR]) {
225 hdr_len = nla_len(tb[TCA_ATM_HDR]);
226 hdr = nla_data(tb[TCA_ATM_HDR]);
227 } else {
228 hdr_len = RFC1483LLC_LEN;
229 hdr = NULL; /* default LLC/SNAP for IP */
230 }
231 if (!tb[TCA_ATM_EXCESS])
232 excess = NULL;
233 else {
234 excess = (struct atm_flow_data *)
235 atm_tc_get(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
236 if (!excess)
237 return -ENOENT;
238 }
239 pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
240 opt->nla_type, nla_len(opt), hdr_len);
241 sock = sockfd_lookup(fd, &error);
242 if (!sock)
243 return error; /* f_count++ */
244 pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
245 if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
246 error = -EPROTOTYPE;
247 goto err_out;
248 }
249 /* @@@ should check if the socket is really operational or we'll crash
250 on vcc->send */
251 if (classid) {
252 if (TC_H_MAJ(classid ^ sch->handle)) {
253 pr_debug("atm_tc_change: classid mismatch\n");
254 error = -EINVAL;
255 goto err_out;
256 }
257 } else {
258 int i;
259 unsigned long cl;
260
261 for (i = 1; i < 0x8000; i++) {
262 classid = TC_H_MAKE(sch->handle, 0x8000 | i);
263 cl = atm_tc_get(sch, classid);
264 if (!cl)
265 break;
266 atm_tc_put(sch, cl);
267 }
268 }
269 pr_debug("atm_tc_change: new id %x\n", classid);
270 flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
271 pr_debug("atm_tc_change: flow %p\n", flow);
272 if (!flow) {
273 error = -ENOBUFS;
274 goto err_out;
275 }
276 RCU_INIT_POINTER(flow->filter_list, NULL);
277 flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid);
278 if (!flow->q)
279 flow->q = &noop_qdisc;
280 pr_debug("atm_tc_change: qdisc %p\n", flow->q);
281 flow->sock = sock;
282 flow->vcc = ATM_SD(sock); /* speedup */
283 flow->vcc->user_back = flow;
284 pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
285 flow->old_pop = flow->vcc->pop;
286 flow->parent = p;
287 flow->vcc->pop = sch_atm_pop;
288 flow->classid = classid;
289 flow->ref = 1;
290 flow->excess = excess;
291 list_add(&flow->list, &p->link.list);
292 flow->hdr_len = hdr_len;
293 if (hdr)
294 memcpy(flow->hdr, hdr, hdr_len);
295 else
296 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
297 *arg = (unsigned long)flow;
298 return 0;
299err_out:
300 if (excess)
301 atm_tc_put(sch, (unsigned long)excess);
302 sockfd_put(sock);
303 return error;
304}
305
306static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
307{
308 struct atm_qdisc_data *p = qdisc_priv(sch);
309 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
310
311 pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
312 if (list_empty(&flow->list))
313 return -EINVAL;
314 if (rcu_access_pointer(flow->filter_list) || flow == &p->link)
315 return -EBUSY;
316 /*
317 * Reference count must be 2: one for "keepalive" (set at class
318 * creation), and one for the reference held when calling delete.
319 */
320 if (flow->ref < 2) {
321 pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
322 return -EINVAL;
323 }
324 if (flow->ref > 2)
325 return -EBUSY; /* catch references via excess, etc. */
326 atm_tc_put(sch, arg);
327 return 0;
328}
329
330static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
331{
332 struct atm_qdisc_data *p = qdisc_priv(sch);
333 struct atm_flow_data *flow;
334
335 pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
336 if (walker->stop)
337 return;
338 list_for_each_entry(flow, &p->flows, list) {
339 if (walker->count >= walker->skip &&
340 walker->fn(sch, (unsigned long)flow, walker) < 0) {
341 walker->stop = 1;
342 break;
343 }
344 walker->count++;
345 }
346}
347
348static struct tcf_proto __rcu **atm_tc_find_tcf(struct Qdisc *sch,
349 unsigned long cl)
350{
351 struct atm_qdisc_data *p = qdisc_priv(sch);
352 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
353
354 pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
355 return flow ? &flow->filter_list : &p->link.filter_list;
356}
357
358/* --------------------------- Qdisc operations ---------------------------- */
359
360static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
361 struct sk_buff **to_free)
362{
363 struct atm_qdisc_data *p = qdisc_priv(sch);
364 struct atm_flow_data *flow;
365 struct tcf_result res;
366 int result;
367 int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
368
369 pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
370 result = TC_ACT_OK; /* be nice to gcc */
371 flow = NULL;
372 if (TC_H_MAJ(skb->priority) != sch->handle ||
373 !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
374 struct tcf_proto *fl;
375
376 list_for_each_entry(flow, &p->flows, list) {
377 fl = rcu_dereference_bh(flow->filter_list);
378 if (fl) {
379 result = tc_classify(skb, fl, &res, true);
380 if (result < 0)
381 continue;
382 flow = (struct atm_flow_data *)res.class;
383 if (!flow)
384 flow = lookup_flow(sch, res.classid);
385 goto done;
386 }
387 }
388 flow = NULL;
389done:
390 ;
391 }
392 if (!flow) {
393 flow = &p->link;
394 } else {
395 if (flow->vcc)
396 ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
397 /*@@@ looks good ... but it's not supposed to work :-) */
398#ifdef CONFIG_NET_CLS_ACT
399 switch (result) {
400 case TC_ACT_QUEUED:
401 case TC_ACT_STOLEN:
402 __qdisc_drop(skb, to_free);
403 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
404 case TC_ACT_SHOT:
405 __qdisc_drop(skb, to_free);
406 goto drop;
407 case TC_ACT_RECLASSIFY:
408 if (flow->excess)
409 flow = flow->excess;
410 else
411 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
412 break;
413 }
414#endif
415 }
416
417 ret = qdisc_enqueue(skb, flow->q, to_free);
418 if (ret != NET_XMIT_SUCCESS) {
419drop: __maybe_unused
420 if (net_xmit_drop_count(ret)) {
421 qdisc_qstats_drop(sch);
422 if (flow)
423 flow->qstats.drops++;
424 }
425 return ret;
426 }
427 /*
428 * Okay, this may seem weird. We pretend we've dropped the packet if
429 * it goes via ATM. The reason for this is that the outer qdisc
430 * expects to be able to q->dequeue the packet later on if we return
431 * success at this place. Also, sch->q.qdisc needs to reflect whether
432 * there is a packet egligible for dequeuing or not. Note that the
433 * statistics of the outer qdisc are necessarily wrong because of all
434 * this. There's currently no correct solution for this.
435 */
436 if (flow == &p->link) {
437 sch->q.qlen++;
438 return NET_XMIT_SUCCESS;
439 }
440 tasklet_schedule(&p->task);
441 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
442}
443
444/*
445 * Dequeue packets and send them over ATM. Note that we quite deliberately
446 * avoid checking net_device's flow control here, simply because sch_atm
447 * uses its own channels, which have nothing to do with any CLIP/LANE/or
448 * non-ATM interfaces.
449 */
450
451static void sch_atm_dequeue(unsigned long data)
452{
453 struct Qdisc *sch = (struct Qdisc *)data;
454 struct atm_qdisc_data *p = qdisc_priv(sch);
455 struct atm_flow_data *flow;
456 struct sk_buff *skb;
457
458 pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
459 list_for_each_entry(flow, &p->flows, list) {
460 if (flow == &p->link)
461 continue;
462 /*
463 * If traffic is properly shaped, this won't generate nasty
464 * little bursts. Otherwise, it may ... (but that's okay)
465 */
466 while ((skb = flow->q->ops->peek(flow->q))) {
467 if (!atm_may_send(flow->vcc, skb->truesize))
468 break;
469
470 skb = qdisc_dequeue_peeked(flow->q);
471 if (unlikely(!skb))
472 break;
473
474 qdisc_bstats_update(sch, skb);
475 bstats_update(&flow->bstats, skb);
476 pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
477 /* remove any LL header somebody else has attached */
478 skb_pull(skb, skb_network_offset(skb));
479 if (skb_headroom(skb) < flow->hdr_len) {
480 struct sk_buff *new;
481
482 new = skb_realloc_headroom(skb, flow->hdr_len);
483 dev_kfree_skb(skb);
484 if (!new)
485 continue;
486 skb = new;
487 }
488 pr_debug("sch_atm_dequeue: ip %p, data %p\n",
489 skb_network_header(skb), skb->data);
490 ATM_SKB(skb)->vcc = flow->vcc;
491 memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
492 flow->hdr_len);
493 atomic_add(skb->truesize,
494 &sk_atm(flow->vcc)->sk_wmem_alloc);
495 /* atm.atm_options are already set by atm_tc_enqueue */
496 flow->vcc->send(flow->vcc, skb);
497 }
498 }
499}
500
501static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
502{
503 struct atm_qdisc_data *p = qdisc_priv(sch);
504 struct sk_buff *skb;
505
506 pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
507 tasklet_schedule(&p->task);
508 skb = qdisc_dequeue_peeked(p->link.q);
509 if (skb)
510 sch->q.qlen--;
511 return skb;
512}
513
514static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
515{
516 struct atm_qdisc_data *p = qdisc_priv(sch);
517
518 pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
519
520 return p->link.q->ops->peek(p->link.q);
521}
522
523static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
524{
525 struct atm_qdisc_data *p = qdisc_priv(sch);
526
527 pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
528 INIT_LIST_HEAD(&p->flows);
529 INIT_LIST_HEAD(&p->link.list);
530 list_add(&p->link.list, &p->flows);
531 p->link.q = qdisc_create_dflt(sch->dev_queue,
532 &pfifo_qdisc_ops, sch->handle);
533 if (!p->link.q)
534 p->link.q = &noop_qdisc;
535 pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
536 RCU_INIT_POINTER(p->link.filter_list, NULL);
537 p->link.vcc = NULL;
538 p->link.sock = NULL;
539 p->link.classid = sch->handle;
540 p->link.ref = 1;
541 tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
542 return 0;
543}
544
545static void atm_tc_reset(struct Qdisc *sch)
546{
547 struct atm_qdisc_data *p = qdisc_priv(sch);
548 struct atm_flow_data *flow;
549
550 pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
551 list_for_each_entry(flow, &p->flows, list)
552 qdisc_reset(flow->q);
553 sch->q.qlen = 0;
554}
555
556static void atm_tc_destroy(struct Qdisc *sch)
557{
558 struct atm_qdisc_data *p = qdisc_priv(sch);
559 struct atm_flow_data *flow, *tmp;
560
561 pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
562 list_for_each_entry(flow, &p->flows, list)
563 tcf_destroy_chain(&flow->filter_list);
564
565 list_for_each_entry_safe(flow, tmp, &p->flows, list) {
566 if (flow->ref > 1)
567 pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
568 atm_tc_put(sch, (unsigned long)flow);
569 }
570 tasklet_kill(&p->task);
571}
572
573static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
574 struct sk_buff *skb, struct tcmsg *tcm)
575{
576 struct atm_qdisc_data *p = qdisc_priv(sch);
577 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
578 struct nlattr *nest;
579
580 pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
581 sch, p, flow, skb, tcm);
582 if (list_empty(&flow->list))
583 return -EINVAL;
584 tcm->tcm_handle = flow->classid;
585 tcm->tcm_info = flow->q->handle;
586
587 nest = nla_nest_start(skb, TCA_OPTIONS);
588 if (nest == NULL)
589 goto nla_put_failure;
590
591 if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
592 goto nla_put_failure;
593 if (flow->vcc) {
594 struct sockaddr_atmpvc pvc;
595 int state;
596
597 memset(&pvc, 0, sizeof(pvc));
598 pvc.sap_family = AF_ATMPVC;
599 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
600 pvc.sap_addr.vpi = flow->vcc->vpi;
601 pvc.sap_addr.vci = flow->vcc->vci;
602 if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
603 goto nla_put_failure;
604 state = ATM_VF2VS(flow->vcc->flags);
605 if (nla_put_u32(skb, TCA_ATM_STATE, state))
606 goto nla_put_failure;
607 }
608 if (flow->excess) {
609 if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->classid))
610 goto nla_put_failure;
611 } else {
612 if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
613 goto nla_put_failure;
614 }
615 return nla_nest_end(skb, nest);
616
617nla_put_failure:
618 nla_nest_cancel(skb, nest);
619 return -1;
620}
621static int
622atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
623 struct gnet_dump *d)
624{
625 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
626
627 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
628 d, NULL, &flow->bstats) < 0 ||
629 gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
630 return -1;
631
632 return 0;
633}
634
635static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
636{
637 return 0;
638}
639
640static const struct Qdisc_class_ops atm_class_ops = {
641 .graft = atm_tc_graft,
642 .leaf = atm_tc_leaf,
643 .get = atm_tc_get,
644 .put = atm_tc_put,
645 .change = atm_tc_change,
646 .delete = atm_tc_delete,
647 .walk = atm_tc_walk,
648 .tcf_chain = atm_tc_find_tcf,
649 .bind_tcf = atm_tc_bind_filter,
650 .unbind_tcf = atm_tc_put,
651 .dump = atm_tc_dump_class,
652 .dump_stats = atm_tc_dump_class_stats,
653};
654
655static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
656 .cl_ops = &atm_class_ops,
657 .id = "atm",
658 .priv_size = sizeof(struct atm_qdisc_data),
659 .enqueue = atm_tc_enqueue,
660 .dequeue = atm_tc_dequeue,
661 .peek = atm_tc_peek,
662 .init = atm_tc_init,
663 .reset = atm_tc_reset,
664 .destroy = atm_tc_destroy,
665 .dump = atm_tc_dump,
666 .owner = THIS_MODULE,
667};
668
669static int __init atm_init(void)
670{
671 return register_qdisc(&atm_qdisc_ops);
672}
673
674static void __exit atm_exit(void)
675{
676 unregister_qdisc(&atm_qdisc_ops);
677}
678
679module_init(atm_init)
680module_exit(atm_exit)
681MODULE_LICENSE("GPL");