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 #include <net/pkt_cls.h>
  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 __rcu  *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, NULL);
 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         RCU_INIT_POINTER(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 (rcu_access_pointer(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 __rcu **atm_tc_find_tcf(struct Qdisc *sch,
 350                                                 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                           struct sk_buff **to_free)
 363 {
 364         struct atm_qdisc_data *p = qdisc_priv(sch);
 365         struct atm_flow_data *flow;
 366         struct tcf_result res;
 367         int result;
 368         int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 369
 370         pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
 371         result = TC_ACT_OK;     /* be nice to gcc */
 372         flow = NULL;
 373         if (TC_H_MAJ(skb->priority) != sch->handle ||
 374             !(flow = (struct atm_flow_data *)atm_tc_get(sch, skb->priority))) {
 375                 struct tcf_proto *fl;
 376
 377                 list_for_each_entry(flow, &p->flows, list) {
 378                         fl = rcu_dereference_bh(flow->filter_list);
 379                         if (fl) {
 380                                 result = tc_classify(skb, fl, &res, true);
 381                                 if (result < 0)
 382                                         continue;
 383                                 flow = (struct atm_flow_data *)res.class;
 384                                 if (!flow)
 385                                         flow = lookup_flow(sch, res.classid);
 386                                 goto done;
 387                         }
 388                 }
 389                 flow = NULL;
 390 done:
 391                 ;
 392         }
 393         if (!flow) {
 394                 flow = &p->link;
 395         } else {
 396                 if (flow->vcc)
 397                         ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
 398                 /*@@@ looks good ... but it's not supposed to work :-) */
 399 #ifdef CONFIG_NET_CLS_ACT
 400                 switch (result) {
 401                 case TC_ACT_QUEUED:
 402                 case TC_ACT_STOLEN:
 403                         __qdisc_drop(skb, to_free);
 404                         return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
 405                 case TC_ACT_SHOT:
 406                         __qdisc_drop(skb, to_free);
 407                         goto drop;
 408                 case TC_ACT_RECLASSIFY:
 409                         if (flow->excess)
 410                                 flow = flow->excess;
 411                         else
 412                                 ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
 413                         break;
 414                 }
 415 #endif
 416         }
 417
 418         ret = qdisc_enqueue(skb, flow->q, to_free);
 419         if (ret != NET_XMIT_SUCCESS) {
 420 drop: __maybe_unused
 421                 if (net_xmit_drop_count(ret)) {
 422                         qdisc_qstats_drop(sch);
 423                         if (flow)
 424                                 flow->qstats.drops++;
 425                 }
 426                 return ret;
 427         }
 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                         qdisc_bstats_update(sch, skb);
 476                         bstats_update(&flow->bstats, skb);
 477                         pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
 478                         /* remove any LL header somebody else has attached */
 479                         skb_pull(skb, skb_network_offset(skb));
 480                         if (skb_headroom(skb) < flow->hdr_len) {
 481                                 struct sk_buff *new;
 482
 483                                 new = skb_realloc_headroom(skb, flow->hdr_len);
 484                                 dev_kfree_skb(skb);
 485                                 if (!new)
 486                                         continue;
 487                                 skb = new;
 488                         }
 489                         pr_debug("sch_atm_dequeue: ip %p, data %p\n",
 490                                  skb_network_header(skb), skb->data);
 491                         ATM_SKB(skb)->vcc = flow->vcc;
 492                         memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
 493                                flow->hdr_len);
 494                         atomic_add(skb->truesize,
 495                                    &sk_atm(flow->vcc)->sk_wmem_alloc);
 496                         /* atm.atm_options are already set by atm_tc_enqueue */
 497                         flow->vcc->send(flow->vcc, skb);
 498                 }
 499         }
 500 }
 501
 502 static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
 503 {
 504         struct atm_qdisc_data *p = qdisc_priv(sch);
 505         struct sk_buff *skb;
 506
 507         pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
 508         tasklet_schedule(&p->task);
 509         skb = qdisc_dequeue_peeked(p->link.q);
 510         if (skb)
 511                 sch->q.qlen--;
 512         return skb;
 513 }
 514
 515 static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
 516 {
 517         struct atm_qdisc_data *p = qdisc_priv(sch);
 518
 519         pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
 520
 521         return p->link.q->ops->peek(p->link.q);
 522 }
 523
 524 static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
 525 {
 526         struct atm_qdisc_data *p = qdisc_priv(sch);
 527
 528         pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
 529         INIT_LIST_HEAD(&p->flows);
 530         INIT_LIST_HEAD(&p->link.list);
 531         list_add(&p->link.list, &p->flows);
 532         p->link.q = qdisc_create_dflt(sch->dev_queue,
 533                                       &pfifo_qdisc_ops, sch->handle);
 534         if (!p->link.q)
 535                 p->link.q = &noop_qdisc;
 536         pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
 537         RCU_INIT_POINTER(p->link.filter_list, NULL);
 538         p->link.vcc = NULL;
 539         p->link.sock = NULL;
 540         p->link.classid = sch->handle;
 541         p->link.ref = 1;
 542         tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
 543         return 0;
 544 }
 545
 546 static void atm_tc_reset(struct Qdisc *sch)
 547 {
 548         struct atm_qdisc_data *p = qdisc_priv(sch);
 549         struct atm_flow_data *flow;
 550
 551         pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
 552         list_for_each_entry(flow, &p->flows, list)
 553                 qdisc_reset(flow->q);
 554         sch->q.qlen = 0;
 555 }
 556
 557 static void atm_tc_destroy(struct Qdisc *sch)
 558 {
 559         struct atm_qdisc_data *p = qdisc_priv(sch);
 560         struct atm_flow_data *flow, *tmp;
 561
 562         pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
 563         list_for_each_entry(flow, &p->flows, list)
 564                 tcf_destroy_chain(&flow->filter_list);
 565
 566         list_for_each_entry_safe(flow, tmp, &p->flows, list) {
 567                 if (flow->ref > 1)
 568                         pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
 569                 atm_tc_put(sch, (unsigned long)flow);
 570         }
 571         tasklet_kill(&p->task);
 572 }
 573
 574 static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
 575                              struct sk_buff *skb, struct tcmsg *tcm)
 576 {
 577         struct atm_qdisc_data *p = qdisc_priv(sch);
 578         struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 579         struct nlattr *nest;
 580
 581         pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
 582                 sch, p, flow, skb, tcm);
 583         if (list_empty(&flow->list))
 584                 return -EINVAL;
 585         tcm->tcm_handle = flow->classid;
 586         tcm->tcm_info = flow->q->handle;
 587
 588         nest = nla_nest_start(skb, TCA_OPTIONS);
 589         if (nest == NULL)
 590                 goto nla_put_failure;
 591
 592         if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
 593                 goto nla_put_failure;
 594         if (flow->vcc) {
 595                 struct sockaddr_atmpvc pvc;
 596                 int state;
 597
 598                 memset(&pvc, 0, sizeof(pvc));
 599                 pvc.sap_family = AF_ATMPVC;
 600                 pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 601                 pvc.sap_addr.vpi = flow->vcc->vpi;
 602                 pvc.sap_addr.vci = flow->vcc->vci;
 603                 if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
 604                         goto nla_put_failure;
 605                 state = ATM_VF2VS(flow->vcc->flags);
 606                 if (nla_put_u32(skb, TCA_ATM_STATE, state))
 607                         goto nla_put_failure;
 608         }
 609         if (flow->excess) {
 610                 if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->classid))
 611                         goto nla_put_failure;
 612         } else {
 613                 if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
 614                         goto nla_put_failure;
 615         }
 616         return nla_nest_end(skb, nest);
 617
 618 nla_put_failure:
 619         nla_nest_cancel(skb, nest);
 620         return -1;
 621 }
 622 static int
 623 atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 624                         struct gnet_dump *d)
 625 {
 626         struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 627
 628         if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
 629                                   d, NULL, &flow->bstats) < 0 ||
 630             gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
 631                 return -1;
 632
 633         return 0;
 634 }
 635
 636 static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 637 {
 638         return 0;
 639 }
 640
 641 static const struct Qdisc_class_ops atm_class_ops = {
 642         .graft          = atm_tc_graft,
 643         .leaf           = atm_tc_leaf,
 644         .get            = atm_tc_get,
 645         .put            = atm_tc_put,
 646         .change         = atm_tc_change,
 647         .delete         = atm_tc_delete,
 648         .walk           = atm_tc_walk,
 649         .tcf_chain      = atm_tc_find_tcf,
 650         .bind_tcf       = atm_tc_bind_filter,
 651         .unbind_tcf     = atm_tc_put,
 652         .dump           = atm_tc_dump_class,
 653         .dump_stats     = atm_tc_dump_class_stats,
 654 };
 655
 656 static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
 657         .cl_ops         = &atm_class_ops,
 658         .id             = "atm",
 659         .priv_size      = sizeof(struct atm_qdisc_data),
 660         .enqueue        = atm_tc_enqueue,
 661         .dequeue        = atm_tc_dequeue,
 662         .peek           = atm_tc_peek,
 663         .init           = atm_tc_init,
 664         .reset          = atm_tc_reset,
 665         .destroy        = atm_tc_destroy,
 666         .dump           = atm_tc_dump,
 667         .owner          = THIS_MODULE,
 668 };
 669
 670 static int __init atm_init(void)
 671 {
 672         return register_qdisc(&atm_qdisc_ops);
 673 }
 674
 675 static void __exit atm_exit(void)
 676 {
 677         unregister_qdisc(&atm_qdisc_ops);
 678 }
 679
 680 module_init(atm_init)
 681 module_exit(atm_exit)
 682 MODULE_LICENSE("GPL");