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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// SPDX-License-Identifier: GPL-2.0-only
2/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
3
4/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
5
6#include <linux/module.h>
7#include <linux/slab.h>
8#include <linux/init.h>
9#include <linux/interrupt.h>
10#include <linux/string.h>
11#include <linux/errno.h>
12#include <linux/skbuff.h>
13#include <linux/atmdev.h>
14#include <linux/atmclip.h>
15#include <linux/rtnetlink.h>
16#include <linux/file.h> /* for fput */
17#include <net/netlink.h>
18#include <net/pkt_sched.h>
19#include <net/pkt_cls.h>
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_class_common common;
46 struct Qdisc *q; /* FIFO, TBF, etc. */
47 struct tcf_proto __rcu *filter_list;
48 struct tcf_block *block;
49 struct atm_vcc *vcc; /* VCC; NULL if VCC is closed */
50 void (*old_pop)(struct atm_vcc *vcc,
51 struct sk_buff *skb); /* chaining */
52 struct atm_qdisc_data *parent; /* parent qdisc */
53 struct socket *sock; /* for closing */
54 int ref; /* reference count */
55 struct gnet_stats_basic_packed bstats;
56 struct gnet_stats_queue qstats;
57 struct list_head list;
58 struct atm_flow_data *excess; /* flow for excess traffic;
59 NULL to set CLP instead */
60 int hdr_len;
61 unsigned char hdr[]; /* header data; MUST BE LAST */
62};
63
64struct atm_qdisc_data {
65 struct atm_flow_data link; /* unclassified skbs go here */
66 struct list_head flows; /* NB: "link" is also on this
67 list */
68 struct tasklet_struct task; /* dequeue tasklet */
69};
70
71/* ------------------------- Class/flow operations ------------------------- */
72
73static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
74{
75 struct atm_qdisc_data *p = qdisc_priv(sch);
76 struct atm_flow_data *flow;
77
78 list_for_each_entry(flow, &p->flows, list) {
79 if (flow->common.classid == classid)
80 return flow;
81 }
82 return NULL;
83}
84
85static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
86 struct Qdisc *new, struct Qdisc **old,
87 struct netlink_ext_ack *extack)
88{
89 struct atm_qdisc_data *p = qdisc_priv(sch);
90 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
91
92 pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
93 sch, p, flow, new, old);
94 if (list_empty(&flow->list))
95 return -EINVAL;
96 if (!new)
97 new = &noop_qdisc;
98 *old = flow->q;
99 flow->q = new;
100 if (*old)
101 qdisc_reset(*old);
102 return 0;
103}
104
105static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
106{
107 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
108
109 pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
110 return flow ? flow->q : NULL;
111}
112
113static unsigned long atm_tc_find(struct Qdisc *sch, u32 classid)
114{
115 struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
116 struct atm_flow_data *flow;
117
118 pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
119 flow = lookup_flow(sch, classid);
120 pr_debug("%s: flow %p\n", __func__, 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 struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
128 struct atm_flow_data *flow;
129
130 pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
131 flow = lookup_flow(sch, classid);
132 if (flow)
133 flow->ref++;
134 pr_debug("%s: flow %p\n", __func__, flow);
135 return (unsigned long)flow;
136}
137
138/*
139 * atm_tc_put handles all destructions, including the ones that are explicitly
140 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
141 * anything that still seems to be in use.
142 */
143static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
144{
145 struct atm_qdisc_data *p = qdisc_priv(sch);
146 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
147
148 pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
149 if (--flow->ref)
150 return;
151 pr_debug("atm_tc_put: destroying\n");
152 list_del_init(&flow->list);
153 pr_debug("atm_tc_put: qdisc %p\n", flow->q);
154 qdisc_put(flow->q);
155 tcf_block_put(flow->block);
156 if (flow->sock) {
157 pr_debug("atm_tc_put: f_count %ld\n",
158 file_count(flow->sock->file));
159 flow->vcc->pop = flow->old_pop;
160 sockfd_put(flow->sock);
161 }
162 if (flow->excess)
163 atm_tc_put(sch, (unsigned long)flow->excess);
164 if (flow != &p->link)
165 kfree(flow);
166 /*
167 * If flow == &p->link, the qdisc no longer works at this point and
168 * needs to be removed. (By the caller of atm_tc_put.)
169 */
170}
171
172static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
173{
174 struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
175
176 pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
177 VCC2FLOW(vcc)->old_pop(vcc, skb);
178 tasklet_schedule(&p->task);
179}
180
181static const u8 llc_oui_ip[] = {
182 0xaa, /* DSAP: non-ISO */
183 0xaa, /* SSAP: non-ISO */
184 0x03, /* Ctrl: Unnumbered Information Command PDU */
185 0x00, /* OUI: EtherType */
186 0x00, 0x00,
187 0x08, 0x00
188}; /* Ethertype IP (0800) */
189
190static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
191 [TCA_ATM_FD] = { .type = NLA_U32 },
192 [TCA_ATM_EXCESS] = { .type = NLA_U32 },
193};
194
195static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
196 struct nlattr **tca, unsigned long *arg,
197 struct netlink_ext_ack *extack)
198{
199 struct atm_qdisc_data *p = qdisc_priv(sch);
200 struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
201 struct atm_flow_data *excess = NULL;
202 struct nlattr *opt = tca[TCA_OPTIONS];
203 struct nlattr *tb[TCA_ATM_MAX + 1];
204 struct socket *sock;
205 int fd, error, hdr_len;
206 void *hdr;
207
208 pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
209 "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
210 /*
211 * The concept of parents doesn't apply for this qdisc.
212 */
213 if (parent && parent != TC_H_ROOT && parent != sch->handle)
214 return -EINVAL;
215 /*
216 * ATM classes cannot be changed. In order to change properties of the
217 * ATM connection, that socket needs to be modified directly (via the
218 * native ATM API. In order to send a flow to a different VC, the old
219 * class needs to be removed and a new one added. (This may be changed
220 * later.)
221 */
222 if (flow)
223 return -EBUSY;
224 if (opt == NULL)
225 return -EINVAL;
226
227 error = nla_parse_nested_deprecated(tb, TCA_ATM_MAX, opt, atm_policy,
228 NULL);
229 if (error < 0)
230 return error;
231
232 if (!tb[TCA_ATM_FD])
233 return -EINVAL;
234 fd = nla_get_u32(tb[TCA_ATM_FD]);
235 pr_debug("atm_tc_change: fd %d\n", fd);
236 if (tb[TCA_ATM_HDR]) {
237 hdr_len = nla_len(tb[TCA_ATM_HDR]);
238 hdr = nla_data(tb[TCA_ATM_HDR]);
239 } else {
240 hdr_len = RFC1483LLC_LEN;
241 hdr = NULL; /* default LLC/SNAP for IP */
242 }
243 if (!tb[TCA_ATM_EXCESS])
244 excess = NULL;
245 else {
246 excess = (struct atm_flow_data *)
247 atm_tc_find(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
248 if (!excess)
249 return -ENOENT;
250 }
251 pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
252 opt->nla_type, nla_len(opt), hdr_len);
253 sock = sockfd_lookup(fd, &error);
254 if (!sock)
255 return error; /* f_count++ */
256 pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
257 if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
258 error = -EPROTOTYPE;
259 goto err_out;
260 }
261 /* @@@ should check if the socket is really operational or we'll crash
262 on vcc->send */
263 if (classid) {
264 if (TC_H_MAJ(classid ^ sch->handle)) {
265 pr_debug("atm_tc_change: classid mismatch\n");
266 error = -EINVAL;
267 goto err_out;
268 }
269 } else {
270 int i;
271 unsigned long cl;
272
273 for (i = 1; i < 0x8000; i++) {
274 classid = TC_H_MAKE(sch->handle, 0x8000 | i);
275 cl = atm_tc_find(sch, classid);
276 if (!cl)
277 break;
278 }
279 }
280 pr_debug("atm_tc_change: new id %x\n", classid);
281 flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
282 pr_debug("atm_tc_change: flow %p\n", flow);
283 if (!flow) {
284 error = -ENOBUFS;
285 goto err_out;
286 }
287
288 error = tcf_block_get(&flow->block, &flow->filter_list, sch,
289 extack);
290 if (error) {
291 kfree(flow);
292 goto err_out;
293 }
294
295 flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid,
296 extack);
297 if (!flow->q)
298 flow->q = &noop_qdisc;
299 pr_debug("atm_tc_change: qdisc %p\n", flow->q);
300 flow->sock = sock;
301 flow->vcc = ATM_SD(sock); /* speedup */
302 flow->vcc->user_back = flow;
303 pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
304 flow->old_pop = flow->vcc->pop;
305 flow->parent = p;
306 flow->vcc->pop = sch_atm_pop;
307 flow->common.classid = classid;
308 flow->ref = 1;
309 flow->excess = excess;
310 list_add(&flow->list, &p->link.list);
311 flow->hdr_len = hdr_len;
312 if (hdr)
313 memcpy(flow->hdr, hdr, hdr_len);
314 else
315 memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
316 *arg = (unsigned long)flow;
317 return 0;
318err_out:
319 sockfd_put(sock);
320 return error;
321}
322
323static int atm_tc_delete(struct Qdisc *sch, unsigned long arg)
324{
325 struct atm_qdisc_data *p = qdisc_priv(sch);
326 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
327
328 pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
329 if (list_empty(&flow->list))
330 return -EINVAL;
331 if (rcu_access_pointer(flow->filter_list) || flow == &p->link)
332 return -EBUSY;
333 /*
334 * Reference count must be 2: one for "keepalive" (set at class
335 * creation), and one for the reference held when calling delete.
336 */
337 if (flow->ref < 2) {
338 pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
339 return -EINVAL;
340 }
341 if (flow->ref > 2)
342 return -EBUSY; /* catch references via excess, etc. */
343 atm_tc_put(sch, arg);
344 return 0;
345}
346
347static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
348{
349 struct atm_qdisc_data *p = qdisc_priv(sch);
350 struct atm_flow_data *flow;
351
352 pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
353 if (walker->stop)
354 return;
355 list_for_each_entry(flow, &p->flows, list) {
356 if (walker->count >= walker->skip &&
357 walker->fn(sch, (unsigned long)flow, walker) < 0) {
358 walker->stop = 1;
359 break;
360 }
361 walker->count++;
362 }
363}
364
365static struct tcf_block *atm_tc_tcf_block(struct Qdisc *sch, unsigned long cl,
366 struct netlink_ext_ack *extack)
367{
368 struct atm_qdisc_data *p = qdisc_priv(sch);
369 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
370
371 pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
372 return flow ? flow->block : p->link.block;
373}
374
375/* --------------------------- Qdisc operations ---------------------------- */
376
377static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
378 struct sk_buff **to_free)
379{
380 struct atm_qdisc_data *p = qdisc_priv(sch);
381 struct atm_flow_data *flow;
382 struct tcf_result res;
383 int result;
384 int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
385
386 pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
387 result = TC_ACT_OK; /* be nice to gcc */
388 flow = NULL;
389 if (TC_H_MAJ(skb->priority) != sch->handle ||
390 !(flow = (struct atm_flow_data *)atm_tc_find(sch, skb->priority))) {
391 struct tcf_proto *fl;
392
393 list_for_each_entry(flow, &p->flows, list) {
394 fl = rcu_dereference_bh(flow->filter_list);
395 if (fl) {
396 result = tcf_classify(skb, fl, &res, true);
397 if (result < 0)
398 continue;
399 flow = (struct atm_flow_data *)res.class;
400 if (!flow)
401 flow = lookup_flow(sch, res.classid);
402 goto done;
403 }
404 }
405 flow = NULL;
406done:
407 ;
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 case TC_ACT_TRAP:
420 __qdisc_drop(skb, to_free);
421 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
422 case TC_ACT_SHOT:
423 __qdisc_drop(skb, to_free);
424 goto drop;
425 case TC_ACT_RECLASSIFY:
426 if (flow->excess)
427 flow = flow->excess;
428 else
429 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
430 break;
431 }
432#endif
433 }
434
435 ret = qdisc_enqueue(skb, flow->q, to_free);
436 if (ret != NET_XMIT_SUCCESS) {
437drop: __maybe_unused
438 if (net_xmit_drop_count(ret)) {
439 qdisc_qstats_drop(sch);
440 if (flow)
441 flow->qstats.drops++;
442 }
443 return ret;
444 }
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 NET_XMIT_SUCCESS;
457 }
458 tasklet_schedule(&p->task);
459 return NET_XMIT_SUCCESS | __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
469static void sch_atm_dequeue(unsigned long data)
470{
471 struct Qdisc *sch = (struct Qdisc *)data;
472 struct atm_qdisc_data *p = qdisc_priv(sch);
473 struct atm_flow_data *flow;
474 struct sk_buff *skb;
475
476 pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
477 list_for_each_entry(flow, &p->flows, list) {
478 if (flow == &p->link)
479 continue;
480 /*
481 * If traffic is properly shaped, this won't generate nasty
482 * little bursts. Otherwise, it may ... (but that's okay)
483 */
484 while ((skb = flow->q->ops->peek(flow->q))) {
485 if (!atm_may_send(flow->vcc, skb->truesize))
486 break;
487
488 skb = qdisc_dequeue_peeked(flow->q);
489 if (unlikely(!skb))
490 break;
491
492 qdisc_bstats_update(sch, skb);
493 bstats_update(&flow->bstats, skb);
494 pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
495 /* remove any LL header somebody else has attached */
496 skb_pull(skb, skb_network_offset(skb));
497 if (skb_headroom(skb) < flow->hdr_len) {
498 struct sk_buff *new;
499
500 new = skb_realloc_headroom(skb, flow->hdr_len);
501 dev_kfree_skb(skb);
502 if (!new)
503 continue;
504 skb = new;
505 }
506 pr_debug("sch_atm_dequeue: ip %p, data %p\n",
507 skb_network_header(skb), skb->data);
508 ATM_SKB(skb)->vcc = flow->vcc;
509 memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
510 flow->hdr_len);
511 refcount_add(skb->truesize,
512 &sk_atm(flow->vcc)->sk_wmem_alloc);
513 /* atm.atm_options are already set by atm_tc_enqueue */
514 flow->vcc->send(flow->vcc, skb);
515 }
516 }
517}
518
519static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
520{
521 struct atm_qdisc_data *p = qdisc_priv(sch);
522 struct sk_buff *skb;
523
524 pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
525 tasklet_schedule(&p->task);
526 skb = qdisc_dequeue_peeked(p->link.q);
527 if (skb)
528 sch->q.qlen--;
529 return skb;
530}
531
532static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
533{
534 struct atm_qdisc_data *p = qdisc_priv(sch);
535
536 pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
537
538 return p->link.q->ops->peek(p->link.q);
539}
540
541static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt,
542 struct netlink_ext_ack *extack)
543{
544 struct atm_qdisc_data *p = qdisc_priv(sch);
545 int err;
546
547 pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
548 INIT_LIST_HEAD(&p->flows);
549 INIT_LIST_HEAD(&p->link.list);
550 list_add(&p->link.list, &p->flows);
551 p->link.q = qdisc_create_dflt(sch->dev_queue,
552 &pfifo_qdisc_ops, sch->handle, extack);
553 if (!p->link.q)
554 p->link.q = &noop_qdisc;
555 pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
556 p->link.vcc = NULL;
557 p->link.sock = NULL;
558 p->link.common.classid = sch->handle;
559 p->link.ref = 1;
560
561 err = tcf_block_get(&p->link.block, &p->link.filter_list, sch,
562 extack);
563 if (err)
564 return err;
565
566 tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
567 return 0;
568}
569
570static void atm_tc_reset(struct Qdisc *sch)
571{
572 struct atm_qdisc_data *p = qdisc_priv(sch);
573 struct atm_flow_data *flow;
574
575 pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
576 list_for_each_entry(flow, &p->flows, list)
577 qdisc_reset(flow->q);
578 sch->q.qlen = 0;
579}
580
581static void atm_tc_destroy(struct Qdisc *sch)
582{
583 struct atm_qdisc_data *p = qdisc_priv(sch);
584 struct atm_flow_data *flow, *tmp;
585
586 pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
587 list_for_each_entry(flow, &p->flows, list) {
588 tcf_block_put(flow->block);
589 flow->block = NULL;
590 }
591
592 list_for_each_entry_safe(flow, tmp, &p->flows, list) {
593 if (flow->ref > 1)
594 pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
595 atm_tc_put(sch, (unsigned long)flow);
596 }
597 tasklet_kill(&p->task);
598}
599
600static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
601 struct sk_buff *skb, struct tcmsg *tcm)
602{
603 struct atm_qdisc_data *p = qdisc_priv(sch);
604 struct atm_flow_data *flow = (struct atm_flow_data *)cl;
605 struct nlattr *nest;
606
607 pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
608 sch, p, flow, skb, tcm);
609 if (list_empty(&flow->list))
610 return -EINVAL;
611 tcm->tcm_handle = flow->common.classid;
612 tcm->tcm_info = flow->q->handle;
613
614 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
615 if (nest == NULL)
616 goto nla_put_failure;
617
618 if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
619 goto nla_put_failure;
620 if (flow->vcc) {
621 struct sockaddr_atmpvc pvc;
622 int state;
623
624 memset(&pvc, 0, sizeof(pvc));
625 pvc.sap_family = AF_ATMPVC;
626 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
627 pvc.sap_addr.vpi = flow->vcc->vpi;
628 pvc.sap_addr.vci = flow->vcc->vci;
629 if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
630 goto nla_put_failure;
631 state = ATM_VF2VS(flow->vcc->flags);
632 if (nla_put_u32(skb, TCA_ATM_STATE, state))
633 goto nla_put_failure;
634 }
635 if (flow->excess) {
636 if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->common.classid))
637 goto nla_put_failure;
638 } else {
639 if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
640 goto nla_put_failure;
641 }
642 return nla_nest_end(skb, nest);
643
644nla_put_failure:
645 nla_nest_cancel(skb, nest);
646 return -1;
647}
648static int
649atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
650 struct gnet_dump *d)
651{
652 struct atm_flow_data *flow = (struct atm_flow_data *)arg;
653
654 if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
655 d, NULL, &flow->bstats) < 0 ||
656 gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
657 return -1;
658
659 return 0;
660}
661
662static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
663{
664 return 0;
665}
666
667static const struct Qdisc_class_ops atm_class_ops = {
668 .graft = atm_tc_graft,
669 .leaf = atm_tc_leaf,
670 .find = atm_tc_find,
671 .change = atm_tc_change,
672 .delete = atm_tc_delete,
673 .walk = atm_tc_walk,
674 .tcf_block = atm_tc_tcf_block,
675 .bind_tcf = atm_tc_bind_filter,
676 .unbind_tcf = atm_tc_put,
677 .dump = atm_tc_dump_class,
678 .dump_stats = atm_tc_dump_class_stats,
679};
680
681static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
682 .cl_ops = &atm_class_ops,
683 .id = "atm",
684 .priv_size = sizeof(struct atm_qdisc_data),
685 .enqueue = atm_tc_enqueue,
686 .dequeue = atm_tc_dequeue,
687 .peek = atm_tc_peek,
688 .init = atm_tc_init,
689 .reset = atm_tc_reset,
690 .destroy = atm_tc_destroy,
691 .dump = atm_tc_dump,
692 .owner = THIS_MODULE,
693};
694
695static int __init atm_init(void)
696{
697 return register_qdisc(&atm_qdisc_ops);
698}
699
700static void __exit atm_exit(void)
701{
702 unregister_qdisc(&atm_qdisc_ops);
703}
704
705module_init(atm_init)
706module_exit(atm_exit)
707MODULE_LICENSE("GPL");