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/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 extern 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
  44 struct 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
  63 struct 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
  72 static 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
  84 static 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
 103 static 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
 111 static 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
 124 static 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  */
 135 static 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
 164 static 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
 173 static 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
 182 static 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
 187 static 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;
 301 err_out:
 302         if (excess)
 303                 atm_tc_put(sch, (unsigned long)excess);
 304         sockfd_put(sock);
 305         return error;
 306 }
 307
 308 static 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
 332 static 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
 350 static 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
 361 static 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;
 388 done:
 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) {
 418 drop: __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
 452 static 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
 500 static 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
 513 static 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
 522 static 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
 536 static 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
 558 static 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
 569 static 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
 586 static 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                 memset(&pvc, 0, sizeof(pvc));
 610                 pvc.sap_family = AF_ATMPVC;
 611                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 612                 pvc.sap_addr.vpi = flow->vcc->vpi;
 613                 pvc.sap_addr.vci = flow->vcc->vci;
 614                 NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
 615                 state = ATM_VF2VS(flow->vcc->flags);
 616                 NLA_PUT_U32(skb, TCA_ATM_STATE, state);
 617         }
 618         if (flow->excess)
 619                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
 620         else
 621                 NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
 622
 623         nla_nest_end(skb, nest);
 624         return skb->len;
 625
 626 nla_put_failure:
 627         nla_nest_cancel(skb, nest);
 628         return -1;
 629 }
 630 static int
 631 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 632                         struct gnet_dump *d)
 633 {
 634         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 635
 636         flow->qstats.qlen = flow->q->q.qlen;
 637
 638         if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
 639             gnet_stats_copy_queue(d, &flow->qstats) < 0)
 640                 return -1;
 641
 642         return 0;
 643 }
 644
 645 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 646 {
 647         return 0;
 648 }
 649
 650 static const struct Qdisc_class_ops atm_class_ops = {
 651         .graft          = atm_tc_graft,
 652         .leaf           = atm_tc_leaf,
 653         .get            = atm_tc_get,
 654         .put            = atm_tc_put,
 655         .change         = atm_tc_change,
 656         .delete         = atm_tc_delete,
 657         .walk           = atm_tc_walk,
 658         .tcf_chain      = atm_tc_find_tcf,
 659         .bind_tcf       = atm_tc_bind_filter,
 660         .unbind_tcf     = atm_tc_put,
 661         .dump           = atm_tc_dump_class,
 662         .dump_stats     = atm_tc_dump_class_stats,
 663 };
 664
 665 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
 666         .cl_ops         = &atm_class_ops,
 667         .id             = "atm",
 668         .priv_size      = sizeof(struct atm_qdisc_data),
 669         .enqueue        = atm_tc_enqueue,
 670         .dequeue        = atm_tc_dequeue,
 671         .peek           = atm_tc_peek,
 672         .drop           = atm_tc_drop,
 673         .init           = atm_tc_init,
 674         .reset          = atm_tc_reset,
 675         .destroy        = atm_tc_destroy,
 676         .dump           = atm_tc_dump,
 677         .owner          = THIS_MODULE,
 678 };
 679
 680 static int __init atm_init(void)
 681 {
 682         return register_qdisc(&atm_qdisc_ops);
 683 }
 684
 685 static void __exit atm_exit(void)
 686 {
 687         unregister_qdisc(&atm_qdisc_ops);
 688 }
 689
 690 module_init(atm_init)
 691 module_exit(atm_exit)
 692 MODULE_LICENSE("GPL");