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