linux/net/sched/sch_atm.c
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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/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
  18extern 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
  43struct 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
  62struct 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
  71static 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
  83static 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
 102static 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
 110static 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
 123static 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 */
 134static 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
 163static 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
 172static 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
 181static 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
 186static 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;
 300err_out:
 301        if (excess)
 302                atm_tc_put(sch, (unsigned long)excess);
 303        sockfd_put(sock);
 304        return error;
 305}
 306
 307static 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                printk(KERN_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
 331static 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
 349static 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
 360static 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) {
 417drop: __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        sch->bstats.bytes += qdisc_pkt_len(skb);
 426        sch->bstats.packets++;
 427        flow->bstats.bytes += qdisc_pkt_len(skb);
 428        flow->bstats.packets++;
 429        /*
 430         * Okay, this may seem weird. We pretend we've dropped the packet if
 431         * it goes via ATM. The reason for this is that the outer qdisc
 432         * expects to be able to q->dequeue the packet later on if we return
 433         * success at this place. Also, sch->q.qdisc needs to reflect whether
 434         * there is a packet egligible for dequeuing or not. Note that the
 435         * statistics of the outer qdisc are necessarily wrong because of all
 436         * this. There's currently no correct solution for this.
 437         */
 438        if (flow == &p->link) {
 439                sch->q.qlen++;
 440                return NET_XMIT_SUCCESS;
 441        }
 442        tasklet_schedule(&p->task);
 443        return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 444}
 445
 446/*
 447 * Dequeue packets and send them over ATM. Note that we quite deliberately
 448 * avoid checking net_device's flow control here, simply because sch_atm
 449 * uses its own channels, which have nothing to do with any CLIP/LANE/or
 450 * non-ATM interfaces.
 451 */
 452
 453static void sch_atm_dequeue(unsigned long data)
 454{
 455        struct Qdisc *sch = (struct Qdisc *)data;
 456        struct atm_qdisc_data *p = qdisc_priv(sch);
 457        struct atm_flow_data *flow;
 458        struct sk_buff *skb;
 459
 460        pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
 461        list_for_each_entry(flow, &p->flows, list) {
 462                if (flow == &p->link)
 463                        continue;
 464                /*
 465                 * If traffic is properly shaped, this won't generate nasty
 466                 * little bursts. Otherwise, it may ... (but that's okay)
 467                 */
 468                while ((skb = flow->q->ops->peek(flow->q))) {
 469                        if (!atm_may_send(flow->vcc, skb->truesize))
 470                                break;
 471
 472                        skb = qdisc_dequeue_peeked(flow->q);
 473                        if (unlikely(!skb))
 474                                break;
 475
 476                        pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
 477                        /* remove any LL header somebody else has attached */
 478                        skb_pull(skb, skb_network_offset(skb));
 479                        if (skb_headroom(skb) < flow->hdr_len) {
 480                                struct sk_buff *new;
 481
 482                                new = skb_realloc_headroom(skb, flow->hdr_len);
 483                                dev_kfree_skb(skb);
 484                                if (!new)
 485                                        continue;
 486                                skb = new;
 487                        }
 488                        pr_debug("sch_atm_dequeue: ip %p, data %p\n",
 489                                 skb_network_header(skb), skb->data);
 490                        ATM_SKB(skb)->vcc = flow->vcc;
 491                        memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
 492                               flow->hdr_len);
 493                        atomic_add(skb->truesize,
 494                                   &sk_atm(flow->vcc)->sk_wmem_alloc);
 495                        /* atm.atm_options are already set by atm_tc_enqueue */
 496                        flow->vcc->send(flow->vcc, skb);
 497                }
 498        }
 499}
 500
 501static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
 502{
 503        struct atm_qdisc_data *p = qdisc_priv(sch);
 504        struct sk_buff *skb;
 505
 506        pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
 507        tasklet_schedule(&p->task);
 508        skb = qdisc_dequeue_peeked(p->link.q);
 509        if (skb)
 510                sch->q.qlen--;
 511        return skb;
 512}
 513
 514static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
 515{
 516        struct atm_qdisc_data *p = qdisc_priv(sch);
 517
 518        pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
 519
 520        return p->link.q->ops->peek(p->link.q);
 521}
 522
 523static unsigned int atm_tc_drop(struct Qdisc *sch)
 524{
 525        struct atm_qdisc_data *p = qdisc_priv(sch);
 526        struct atm_flow_data *flow;
 527        unsigned int len;
 528
 529        pr_debug("atm_tc_drop(sch %p,[qdisc %p])\n", sch, p);
 530        list_for_each_entry(flow, &p->flows, list) {
 531                if (flow->q->ops->drop && (len = flow->q->ops->drop(flow->q)))
 532                        return len;
 533        }
 534        return 0;
 535}
 536
 537static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt)
 538{
 539        struct atm_qdisc_data *p = qdisc_priv(sch);
 540
 541        pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
 542        INIT_LIST_HEAD(&p->flows);
 543        INIT_LIST_HEAD(&p->link.list);
 544        list_add(&p->link.list, &p->flows);
 545        p->link.q = qdisc_create_dflt(sch->dev_queue,
 546                                      &pfifo_qdisc_ops, sch->handle);
 547        if (!p->link.q)
 548                p->link.q = &noop_qdisc;
 549        pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
 550        p->link.filter_list = NULL;
 551        p->link.vcc = NULL;
 552        p->link.sock = NULL;
 553        p->link.classid = sch->handle;
 554        p->link.ref = 1;
 555        tasklet_init(&p->task, sch_atm_dequeue, (unsigned long)sch);
 556        return 0;
 557}
 558
 559static void atm_tc_reset(struct Qdisc *sch)
 560{
 561        struct atm_qdisc_data *p = qdisc_priv(sch);
 562        struct atm_flow_data *flow;
 563
 564        pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
 565        list_for_each_entry(flow, &p->flows, list)
 566                qdisc_reset(flow->q);
 567        sch->q.qlen = 0;
 568}
 569
 570static void atm_tc_destroy(struct Qdisc *sch)
 571{
 572        struct atm_qdisc_data *p = qdisc_priv(sch);
 573        struct atm_flow_data *flow, *tmp;
 574
 575        pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
 576        list_for_each_entry(flow, &p->flows, list)
 577                tcf_destroy_chain(&flow->filter_list);
 578
 579        list_for_each_entry_safe(flow, tmp, &p->flows, list) {
 580                if (flow->ref > 1)
 581                        printk(KERN_ERR "atm_destroy: %p->ref = %d\n", flow,
 582                               flow->ref);
 583                atm_tc_put(sch, (unsigned long)flow);
 584        }
 585        tasklet_kill(&p->task);
 586}
 587
 588static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
 589                             struct sk_buff *skb, struct tcmsg *tcm)
 590{
 591        struct atm_qdisc_data *p = qdisc_priv(sch);
 592        struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 593        struct nlattr *nest;
 594
 595        pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
 596                sch, p, flow, skb, tcm);
 597        if (list_empty(&flow->list))
 598                return -EINVAL;
 599        tcm->tcm_handle = flow->classid;
 600        tcm->tcm_info = flow->q->handle;
 601
 602        nest = nla_nest_start(skb, TCA_OPTIONS);
 603        if (nest == NULL)
 604                goto nla_put_failure;
 605
 606        NLA_PUT(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr);
 607        if (flow->vcc) {
 608                struct sockaddr_atmpvc pvc;
 609                int state;
 610
 611                pvc.sap_family = AF_ATMPVC;
 612                pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 613                pvc.sap_addr.vpi = flow->vcc->vpi;
 614                pvc.sap_addr.vci = flow->vcc->vci;
 615                NLA_PUT(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc);
 616                state = ATM_VF2VS(flow->vcc->flags);
 617                NLA_PUT_U32(skb, TCA_ATM_STATE, state);
 618        }
 619        if (flow->excess)
 620                NLA_PUT_U32(skb, TCA_ATM_EXCESS, flow->classid);
 621        else {
 622                NLA_PUT_U32(skb, TCA_ATM_EXCESS, 0);
 623        }
 624
 625        nla_nest_end(skb, nest);
 626        return skb->len;
 627
 628nla_put_failure:
 629        nla_nest_cancel(skb, nest);
 630        return -1;
 631}
 632static int
 633atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 634                        struct gnet_dump *d)
 635{
 636        struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 637
 638        flow->qstats.qlen = flow->q->q.qlen;
 639
 640        if (gnet_stats_copy_basic(d, &flow->bstats) < 0 ||
 641            gnet_stats_copy_queue(d, &flow->qstats) < 0)
 642                return -1;
 643
 644        return 0;
 645}
 646
 647static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 648{
 649        return 0;
 650}
 651
 652static const struct Qdisc_class_ops atm_class_ops = {
 653        .graft          = atm_tc_graft,
 654        .leaf           = atm_tc_leaf,
 655        .get            = atm_tc_get,
 656        .put            = atm_tc_put,
 657        .change         = atm_tc_change,
 658        .delete         = atm_tc_delete,
 659        .walk           = atm_tc_walk,
 660        .tcf_chain      = atm_tc_find_tcf,
 661        .bind_tcf       = atm_tc_bind_filter,
 662        .unbind_tcf     = atm_tc_put,
 663        .dump           = atm_tc_dump_class,
 664        .dump_stats     = atm_tc_dump_class_stats,
 665};
 666
 667static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
 668        .cl_ops         = &atm_class_ops,
 669        .id             = "atm",
 670        .priv_size      = sizeof(struct atm_qdisc_data),
 671        .enqueue        = atm_tc_enqueue,
 672        .dequeue        = atm_tc_dequeue,
 673        .peek           = atm_tc_peek,
 674        .drop           = atm_tc_drop,
 675        .init           = atm_tc_init,
 676        .reset          = atm_tc_reset,
 677        .destroy        = atm_tc_destroy,
 678        .dump           = atm_tc_dump,
 679        .owner          = THIS_MODULE,
 680};
 681
 682static int __init atm_init(void)
 683{
 684        return register_qdisc(&atm_qdisc_ops);
 685}
 686
 687static void __exit atm_exit(void)
 688{
 689        unregister_qdisc(&atm_qdisc_ops);
 690}
 691
 692module_init(atm_init)
 693module_exit(atm_exit)
 694MODULE_LICENSE("GPL");
 695