linux/net/sched/sch_atm.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
   3
   4/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
   5
   6#include <linux/module.h>
   7#include <linux/slab.h>
   8#include <linux/init.h>
   9#include <linux/interrupt.h>
  10#include <linux/string.h>
  11#include <linux/errno.h>
  12#include <linux/skbuff.h>
  13#include <linux/atmdev.h>
  14#include <linux/atmclip.h>
  15#include <linux/rtnetlink.h>
  16#include <linux/file.h>         /* for fput */
  17#include <net/netlink.h>
  18#include <net/pkt_sched.h>
  19#include <net/pkt_cls.h>
  20
  21/*
  22 * The ATM queuing discipline provides a framework for invoking classifiers
  23 * (aka "filters"), which in turn select classes of this queuing discipline.
  24 * Each class maps the flow(s) it is handling to a given VC. Multiple classes
  25 * may share the same VC.
  26 *
  27 * When creating a class, VCs are specified by passing the number of the open
  28 * socket descriptor by which the calling process references the VC. The kernel
  29 * keeps the VC open at least until all classes using it are removed.
  30 *
  31 * In this file, most functions are named atm_tc_* to avoid confusion with all
  32 * the atm_* in net/atm. This naming convention differs from what's used in the
  33 * rest of net/sched.
  34 *
  35 * Known bugs:
  36 *  - sometimes messes up the IP stack
  37 *  - any manipulations besides the few operations described in the README, are
  38 *    untested and likely to crash the system
  39 *  - should lock the flow while there is data in the queue (?)
  40 */
  41
  42#define VCC2FLOW(vcc) ((struct atm_flow_data *) ((vcc)->user_back))
  43
  44struct atm_flow_data {
  45        struct Qdisc_class_common common;
  46        struct Qdisc            *q;     /* FIFO, TBF, etc. */
  47        struct tcf_proto __rcu  *filter_list;
  48        struct tcf_block        *block;
  49        struct atm_vcc          *vcc;   /* VCC; NULL if VCC is closed */
  50        void                    (*old_pop)(struct atm_vcc *vcc,
  51                                           struct sk_buff *skb); /* chaining */
  52        struct atm_qdisc_data   *parent;        /* parent qdisc */
  53        struct socket           *sock;          /* for closing */
  54        int                     ref;            /* reference count */
  55        struct gnet_stats_basic_packed  bstats;
  56        struct gnet_stats_queue qstats;
  57        struct list_head        list;
  58        struct atm_flow_data    *excess;        /* flow for excess traffic;
  59                                                   NULL to set CLP instead */
  60        int                     hdr_len;
  61        unsigned char           hdr[];          /* header data; MUST BE LAST */
  62};
  63
  64struct atm_qdisc_data {
  65        struct atm_flow_data    link;           /* unclassified skbs go here */
  66        struct list_head        flows;          /* NB: "link" is also on this
  67                                                   list */
  68        struct tasklet_struct   task;           /* dequeue tasklet */
  69};
  70
  71/* ------------------------- Class/flow operations ------------------------- */
  72
  73static inline struct atm_flow_data *lookup_flow(struct Qdisc *sch, u32 classid)
  74{
  75        struct atm_qdisc_data *p = qdisc_priv(sch);
  76        struct atm_flow_data *flow;
  77
  78        list_for_each_entry(flow, &p->flows, list) {
  79                if (flow->common.classid == classid)
  80                        return flow;
  81        }
  82        return NULL;
  83}
  84
  85static int atm_tc_graft(struct Qdisc *sch, unsigned long arg,
  86                        struct Qdisc *new, struct Qdisc **old,
  87                        struct netlink_ext_ack *extack)
  88{
  89        struct atm_qdisc_data *p = qdisc_priv(sch);
  90        struct atm_flow_data *flow = (struct atm_flow_data *)arg;
  91
  92        pr_debug("atm_tc_graft(sch %p,[qdisc %p],flow %p,new %p,old %p)\n",
  93                sch, p, flow, new, old);
  94        if (list_empty(&flow->list))
  95                return -EINVAL;
  96        if (!new)
  97                new = &noop_qdisc;
  98        *old = flow->q;
  99        flow->q = new;
 100        if (*old)
 101                qdisc_reset(*old);
 102        return 0;
 103}
 104
 105static struct Qdisc *atm_tc_leaf(struct Qdisc *sch, unsigned long cl)
 106{
 107        struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 108
 109        pr_debug("atm_tc_leaf(sch %p,flow %p)\n", sch, flow);
 110        return flow ? flow->q : NULL;
 111}
 112
 113static unsigned long atm_tc_find(struct Qdisc *sch, u32 classid)
 114{
 115        struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
 116        struct atm_flow_data *flow;
 117
 118        pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
 119        flow = lookup_flow(sch, classid);
 120        pr_debug("%s: flow %p\n", __func__, flow);
 121        return (unsigned long)flow;
 122}
 123
 124static unsigned long atm_tc_bind_filter(struct Qdisc *sch,
 125                                        unsigned long parent, u32 classid)
 126{
 127        struct atm_qdisc_data *p __maybe_unused = qdisc_priv(sch);
 128        struct atm_flow_data *flow;
 129
 130        pr_debug("%s(sch %p,[qdisc %p],classid %x)\n", __func__, sch, p, classid);
 131        flow = lookup_flow(sch, classid);
 132        if (flow)
 133                flow->ref++;
 134        pr_debug("%s: flow %p\n", __func__, flow);
 135        return (unsigned long)flow;
 136}
 137
 138/*
 139 * atm_tc_put handles all destructions, including the ones that are explicitly
 140 * requested (atm_tc_destroy, etc.). The assumption here is that we never drop
 141 * anything that still seems to be in use.
 142 */
 143static void atm_tc_put(struct Qdisc *sch, unsigned long cl)
 144{
 145        struct atm_qdisc_data *p = qdisc_priv(sch);
 146        struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 147
 148        pr_debug("atm_tc_put(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 149        if (--flow->ref)
 150                return;
 151        pr_debug("atm_tc_put: destroying\n");
 152        list_del_init(&flow->list);
 153        pr_debug("atm_tc_put: qdisc %p\n", flow->q);
 154        qdisc_put(flow->q);
 155        tcf_block_put(flow->block);
 156        if (flow->sock) {
 157                pr_debug("atm_tc_put: f_count %ld\n",
 158                        file_count(flow->sock->file));
 159                flow->vcc->pop = flow->old_pop;
 160                sockfd_put(flow->sock);
 161        }
 162        if (flow->excess)
 163                atm_tc_put(sch, (unsigned long)flow->excess);
 164        if (flow != &p->link)
 165                kfree(flow);
 166        /*
 167         * If flow == &p->link, the qdisc no longer works at this point and
 168         * needs to be removed. (By the caller of atm_tc_put.)
 169         */
 170}
 171
 172static void sch_atm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
 173{
 174        struct atm_qdisc_data *p = VCC2FLOW(vcc)->parent;
 175
 176        pr_debug("sch_atm_pop(vcc %p,skb %p,[qdisc %p])\n", vcc, skb, p);
 177        VCC2FLOW(vcc)->old_pop(vcc, skb);
 178        tasklet_schedule(&p->task);
 179}
 180
 181static const u8 llc_oui_ip[] = {
 182        0xaa,                   /* DSAP: non-ISO */
 183        0xaa,                   /* SSAP: non-ISO */
 184        0x03,                   /* Ctrl: Unnumbered Information Command PDU */
 185        0x00,                   /* OUI: EtherType */
 186        0x00, 0x00,
 187        0x08, 0x00
 188};                              /* Ethertype IP (0800) */
 189
 190static const struct nla_policy atm_policy[TCA_ATM_MAX + 1] = {
 191        [TCA_ATM_FD]            = { .type = NLA_U32 },
 192        [TCA_ATM_EXCESS]        = { .type = NLA_U32 },
 193};
 194
 195static int atm_tc_change(struct Qdisc *sch, u32 classid, u32 parent,
 196                         struct nlattr **tca, unsigned long *arg,
 197                         struct netlink_ext_ack *extack)
 198{
 199        struct atm_qdisc_data *p = qdisc_priv(sch);
 200        struct atm_flow_data *flow = (struct atm_flow_data *)*arg;
 201        struct atm_flow_data *excess = NULL;
 202        struct nlattr *opt = tca[TCA_OPTIONS];
 203        struct nlattr *tb[TCA_ATM_MAX + 1];
 204        struct socket *sock;
 205        int fd, error, hdr_len;
 206        void *hdr;
 207
 208        pr_debug("atm_tc_change(sch %p,[qdisc %p],classid %x,parent %x,"
 209                "flow %p,opt %p)\n", sch, p, classid, parent, flow, opt);
 210        /*
 211         * The concept of parents doesn't apply for this qdisc.
 212         */
 213        if (parent && parent != TC_H_ROOT && parent != sch->handle)
 214                return -EINVAL;
 215        /*
 216         * ATM classes cannot be changed. In order to change properties of the
 217         * ATM connection, that socket needs to be modified directly (via the
 218         * native ATM API. In order to send a flow to a different VC, the old
 219         * class needs to be removed and a new one added. (This may be changed
 220         * later.)
 221         */
 222        if (flow)
 223                return -EBUSY;
 224        if (opt == NULL)
 225                return -EINVAL;
 226
 227        error = nla_parse_nested_deprecated(tb, TCA_ATM_MAX, opt, atm_policy,
 228                                            NULL);
 229        if (error < 0)
 230                return error;
 231
 232        if (!tb[TCA_ATM_FD])
 233                return -EINVAL;
 234        fd = nla_get_u32(tb[TCA_ATM_FD]);
 235        pr_debug("atm_tc_change: fd %d\n", fd);
 236        if (tb[TCA_ATM_HDR]) {
 237                hdr_len = nla_len(tb[TCA_ATM_HDR]);
 238                hdr = nla_data(tb[TCA_ATM_HDR]);
 239        } else {
 240                hdr_len = RFC1483LLC_LEN;
 241                hdr = NULL;     /* default LLC/SNAP for IP */
 242        }
 243        if (!tb[TCA_ATM_EXCESS])
 244                excess = NULL;
 245        else {
 246                excess = (struct atm_flow_data *)
 247                        atm_tc_find(sch, nla_get_u32(tb[TCA_ATM_EXCESS]));
 248                if (!excess)
 249                        return -ENOENT;
 250        }
 251        pr_debug("atm_tc_change: type %d, payload %d, hdr_len %d\n",
 252                 opt->nla_type, nla_len(opt), hdr_len);
 253        sock = sockfd_lookup(fd, &error);
 254        if (!sock)
 255                return error;   /* f_count++ */
 256        pr_debug("atm_tc_change: f_count %ld\n", file_count(sock->file));
 257        if (sock->ops->family != PF_ATMSVC && sock->ops->family != PF_ATMPVC) {
 258                error = -EPROTOTYPE;
 259                goto err_out;
 260        }
 261        /* @@@ should check if the socket is really operational or we'll crash
 262           on vcc->send */
 263        if (classid) {
 264                if (TC_H_MAJ(classid ^ sch->handle)) {
 265                        pr_debug("atm_tc_change: classid mismatch\n");
 266                        error = -EINVAL;
 267                        goto err_out;
 268                }
 269        } else {
 270                int i;
 271                unsigned long cl;
 272
 273                for (i = 1; i < 0x8000; i++) {
 274                        classid = TC_H_MAKE(sch->handle, 0x8000 | i);
 275                        cl = atm_tc_find(sch, classid);
 276                        if (!cl)
 277                                break;
 278                }
 279        }
 280        pr_debug("atm_tc_change: new id %x\n", classid);
 281        flow = kzalloc(sizeof(struct atm_flow_data) + hdr_len, GFP_KERNEL);
 282        pr_debug("atm_tc_change: flow %p\n", flow);
 283        if (!flow) {
 284                error = -ENOBUFS;
 285                goto err_out;
 286        }
 287
 288        error = tcf_block_get(&flow->block, &flow->filter_list, sch,
 289                              extack);
 290        if (error) {
 291                kfree(flow);
 292                goto err_out;
 293        }
 294
 295        flow->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, classid,
 296                                    extack);
 297        if (!flow->q)
 298                flow->q = &noop_qdisc;
 299        pr_debug("atm_tc_change: qdisc %p\n", flow->q);
 300        flow->sock = sock;
 301        flow->vcc = ATM_SD(sock);       /* speedup */
 302        flow->vcc->user_back = flow;
 303        pr_debug("atm_tc_change: vcc %p\n", flow->vcc);
 304        flow->old_pop = flow->vcc->pop;
 305        flow->parent = p;
 306        flow->vcc->pop = sch_atm_pop;
 307        flow->common.classid = classid;
 308        flow->ref = 1;
 309        flow->excess = excess;
 310        list_add(&flow->list, &p->link.list);
 311        flow->hdr_len = hdr_len;
 312        if (hdr)
 313                memcpy(flow->hdr, hdr, hdr_len);
 314        else
 315                memcpy(flow->hdr, llc_oui_ip, sizeof(llc_oui_ip));
 316        *arg = (unsigned long)flow;
 317        return 0;
 318err_out:
 319        sockfd_put(sock);
 320        return error;
 321}
 322
 323static int atm_tc_delete(struct Qdisc *sch, unsigned long arg,
 324                         struct netlink_ext_ack *extack)
 325{
 326        struct atm_qdisc_data *p = qdisc_priv(sch);
 327        struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 328
 329        pr_debug("atm_tc_delete(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 330        if (list_empty(&flow->list))
 331                return -EINVAL;
 332        if (rcu_access_pointer(flow->filter_list) || flow == &p->link)
 333                return -EBUSY;
 334        /*
 335         * Reference count must be 2: one for "keepalive" (set at class
 336         * creation), and one for the reference held when calling delete.
 337         */
 338        if (flow->ref < 2) {
 339                pr_err("atm_tc_delete: flow->ref == %d\n", flow->ref);
 340                return -EINVAL;
 341        }
 342        if (flow->ref > 2)
 343                return -EBUSY;  /* catch references via excess, etc. */
 344        atm_tc_put(sch, arg);
 345        return 0;
 346}
 347
 348static void atm_tc_walk(struct Qdisc *sch, struct qdisc_walker *walker)
 349{
 350        struct atm_qdisc_data *p = qdisc_priv(sch);
 351        struct atm_flow_data *flow;
 352
 353        pr_debug("atm_tc_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
 354        if (walker->stop)
 355                return;
 356        list_for_each_entry(flow, &p->flows, list) {
 357                if (walker->count >= walker->skip &&
 358                    walker->fn(sch, (unsigned long)flow, walker) < 0) {
 359                        walker->stop = 1;
 360                        break;
 361                }
 362                walker->count++;
 363        }
 364}
 365
 366static struct tcf_block *atm_tc_tcf_block(struct Qdisc *sch, unsigned long cl,
 367                                          struct netlink_ext_ack *extack)
 368{
 369        struct atm_qdisc_data *p = qdisc_priv(sch);
 370        struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 371
 372        pr_debug("atm_tc_find_tcf(sch %p,[qdisc %p],flow %p)\n", sch, p, flow);
 373        return flow ? flow->block : p->link.block;
 374}
 375
 376/* --------------------------- Qdisc operations ---------------------------- */
 377
 378static int atm_tc_enqueue(struct sk_buff *skb, struct Qdisc *sch,
 379                          struct sk_buff **to_free)
 380{
 381        struct atm_qdisc_data *p = qdisc_priv(sch);
 382        struct atm_flow_data *flow;
 383        struct tcf_result res;
 384        int result;
 385        int ret = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 386
 387        pr_debug("atm_tc_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
 388        result = TC_ACT_OK;     /* be nice to gcc */
 389        flow = NULL;
 390        if (TC_H_MAJ(skb->priority) != sch->handle ||
 391            !(flow = (struct atm_flow_data *)atm_tc_find(sch, skb->priority))) {
 392                struct tcf_proto *fl;
 393
 394                list_for_each_entry(flow, &p->flows, list) {
 395                        fl = rcu_dereference_bh(flow->filter_list);
 396                        if (fl) {
 397                                result = tcf_classify(skb, fl, &res, true);
 398                                if (result < 0)
 399                                        continue;
 400                                flow = (struct atm_flow_data *)res.class;
 401                                if (!flow)
 402                                        flow = lookup_flow(sch, res.classid);
 403                                goto done;
 404                        }
 405                }
 406                flow = NULL;
 407done:
 408                ;
 409        }
 410        if (!flow) {
 411                flow = &p->link;
 412        } else {
 413                if (flow->vcc)
 414                        ATM_SKB(skb)->atm_options = flow->vcc->atm_options;
 415                /*@@@ looks good ... but it's not supposed to work :-) */
 416#ifdef CONFIG_NET_CLS_ACT
 417                switch (result) {
 418                case TC_ACT_QUEUED:
 419                case TC_ACT_STOLEN:
 420                case TC_ACT_TRAP:
 421                        __qdisc_drop(skb, to_free);
 422                        return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
 423                case TC_ACT_SHOT:
 424                        __qdisc_drop(skb, to_free);
 425                        goto drop;
 426                case TC_ACT_RECLASSIFY:
 427                        if (flow->excess)
 428                                flow = flow->excess;
 429                        else
 430                                ATM_SKB(skb)->atm_options |= ATM_ATMOPT_CLP;
 431                        break;
 432                }
 433#endif
 434        }
 435
 436        ret = qdisc_enqueue(skb, flow->q, to_free);
 437        if (ret != NET_XMIT_SUCCESS) {
 438drop: __maybe_unused
 439                if (net_xmit_drop_count(ret)) {
 440                        qdisc_qstats_drop(sch);
 441                        if (flow)
 442                                flow->qstats.drops++;
 443                }
 444                return ret;
 445        }
 446        /*
 447         * Okay, this may seem weird. We pretend we've dropped the packet if
 448         * it goes via ATM. The reason for this is that the outer qdisc
 449         * expects to be able to q->dequeue the packet later on if we return
 450         * success at this place. Also, sch->q.qdisc needs to reflect whether
 451         * there is a packet egligible for dequeuing or not. Note that the
 452         * statistics of the outer qdisc are necessarily wrong because of all
 453         * this. There's currently no correct solution for this.
 454         */
 455        if (flow == &p->link) {
 456                sch->q.qlen++;
 457                return NET_XMIT_SUCCESS;
 458        }
 459        tasklet_schedule(&p->task);
 460        return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
 461}
 462
 463/*
 464 * Dequeue packets and send them over ATM. Note that we quite deliberately
 465 * avoid checking net_device's flow control here, simply because sch_atm
 466 * uses its own channels, which have nothing to do with any CLIP/LANE/or
 467 * non-ATM interfaces.
 468 */
 469
 470static void sch_atm_dequeue(struct tasklet_struct *t)
 471{
 472        struct atm_qdisc_data *p = from_tasklet(p, t, task);
 473        struct Qdisc *sch = qdisc_from_priv(p);
 474        struct atm_flow_data *flow;
 475        struct sk_buff *skb;
 476
 477        pr_debug("sch_atm_dequeue(sch %p,[qdisc %p])\n", sch, p);
 478        list_for_each_entry(flow, &p->flows, list) {
 479                if (flow == &p->link)
 480                        continue;
 481                /*
 482                 * If traffic is properly shaped, this won't generate nasty
 483                 * little bursts. Otherwise, it may ... (but that's okay)
 484                 */
 485                while ((skb = flow->q->ops->peek(flow->q))) {
 486                        if (!atm_may_send(flow->vcc, skb->truesize))
 487                                break;
 488
 489                        skb = qdisc_dequeue_peeked(flow->q);
 490                        if (unlikely(!skb))
 491                                break;
 492
 493                        qdisc_bstats_update(sch, skb);
 494                        bstats_update(&flow->bstats, skb);
 495                        pr_debug("atm_tc_dequeue: sending on class %p\n", flow);
 496                        /* remove any LL header somebody else has attached */
 497                        skb_pull(skb, skb_network_offset(skb));
 498                        if (skb_headroom(skb) < flow->hdr_len) {
 499                                struct sk_buff *new;
 500
 501                                new = skb_realloc_headroom(skb, flow->hdr_len);
 502                                dev_kfree_skb(skb);
 503                                if (!new)
 504                                        continue;
 505                                skb = new;
 506                        }
 507                        pr_debug("sch_atm_dequeue: ip %p, data %p\n",
 508                                 skb_network_header(skb), skb->data);
 509                        ATM_SKB(skb)->vcc = flow->vcc;
 510                        memcpy(skb_push(skb, flow->hdr_len), flow->hdr,
 511                               flow->hdr_len);
 512                        refcount_add(skb->truesize,
 513                                   &sk_atm(flow->vcc)->sk_wmem_alloc);
 514                        /* atm.atm_options are already set by atm_tc_enqueue */
 515                        flow->vcc->send(flow->vcc, skb);
 516                }
 517        }
 518}
 519
 520static struct sk_buff *atm_tc_dequeue(struct Qdisc *sch)
 521{
 522        struct atm_qdisc_data *p = qdisc_priv(sch);
 523        struct sk_buff *skb;
 524
 525        pr_debug("atm_tc_dequeue(sch %p,[qdisc %p])\n", sch, p);
 526        tasklet_schedule(&p->task);
 527        skb = qdisc_dequeue_peeked(p->link.q);
 528        if (skb)
 529                sch->q.qlen--;
 530        return skb;
 531}
 532
 533static struct sk_buff *atm_tc_peek(struct Qdisc *sch)
 534{
 535        struct atm_qdisc_data *p = qdisc_priv(sch);
 536
 537        pr_debug("atm_tc_peek(sch %p,[qdisc %p])\n", sch, p);
 538
 539        return p->link.q->ops->peek(p->link.q);
 540}
 541
 542static int atm_tc_init(struct Qdisc *sch, struct nlattr *opt,
 543                       struct netlink_ext_ack *extack)
 544{
 545        struct atm_qdisc_data *p = qdisc_priv(sch);
 546        int err;
 547
 548        pr_debug("atm_tc_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
 549        INIT_LIST_HEAD(&p->flows);
 550        INIT_LIST_HEAD(&p->link.list);
 551        list_add(&p->link.list, &p->flows);
 552        p->link.q = qdisc_create_dflt(sch->dev_queue,
 553                                      &pfifo_qdisc_ops, sch->handle, extack);
 554        if (!p->link.q)
 555                p->link.q = &noop_qdisc;
 556        pr_debug("atm_tc_init: link (%p) qdisc %p\n", &p->link, p->link.q);
 557        p->link.vcc = NULL;
 558        p->link.sock = NULL;
 559        p->link.common.classid = sch->handle;
 560        p->link.ref = 1;
 561
 562        err = tcf_block_get(&p->link.block, &p->link.filter_list, sch,
 563                            extack);
 564        if (err)
 565                return err;
 566
 567        tasklet_setup(&p->task, sch_atm_dequeue);
 568        return 0;
 569}
 570
 571static void atm_tc_reset(struct Qdisc *sch)
 572{
 573        struct atm_qdisc_data *p = qdisc_priv(sch);
 574        struct atm_flow_data *flow;
 575
 576        pr_debug("atm_tc_reset(sch %p,[qdisc %p])\n", sch, p);
 577        list_for_each_entry(flow, &p->flows, list)
 578                qdisc_reset(flow->q);
 579        sch->q.qlen = 0;
 580}
 581
 582static void atm_tc_destroy(struct Qdisc *sch)
 583{
 584        struct atm_qdisc_data *p = qdisc_priv(sch);
 585        struct atm_flow_data *flow, *tmp;
 586
 587        pr_debug("atm_tc_destroy(sch %p,[qdisc %p])\n", sch, p);
 588        list_for_each_entry(flow, &p->flows, list) {
 589                tcf_block_put(flow->block);
 590                flow->block = NULL;
 591        }
 592
 593        list_for_each_entry_safe(flow, tmp, &p->flows, list) {
 594                if (flow->ref > 1)
 595                        pr_err("atm_destroy: %p->ref = %d\n", flow, flow->ref);
 596                atm_tc_put(sch, (unsigned long)flow);
 597        }
 598        tasklet_kill(&p->task);
 599}
 600
 601static int atm_tc_dump_class(struct Qdisc *sch, unsigned long cl,
 602                             struct sk_buff *skb, struct tcmsg *tcm)
 603{
 604        struct atm_qdisc_data *p = qdisc_priv(sch);
 605        struct atm_flow_data *flow = (struct atm_flow_data *)cl;
 606        struct nlattr *nest;
 607
 608        pr_debug("atm_tc_dump_class(sch %p,[qdisc %p],flow %p,skb %p,tcm %p)\n",
 609                sch, p, flow, skb, tcm);
 610        if (list_empty(&flow->list))
 611                return -EINVAL;
 612        tcm->tcm_handle = flow->common.classid;
 613        tcm->tcm_info = flow->q->handle;
 614
 615        nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
 616        if (nest == NULL)
 617                goto nla_put_failure;
 618
 619        if (nla_put(skb, TCA_ATM_HDR, flow->hdr_len, flow->hdr))
 620                goto nla_put_failure;
 621        if (flow->vcc) {
 622                struct sockaddr_atmpvc pvc;
 623                int state;
 624
 625                memset(&pvc, 0, sizeof(pvc));
 626                pvc.sap_family = AF_ATMPVC;
 627                pvc.sap_addr.itf = flow->vcc->dev ? flow->vcc->dev->number : -1;
 628                pvc.sap_addr.vpi = flow->vcc->vpi;
 629                pvc.sap_addr.vci = flow->vcc->vci;
 630                if (nla_put(skb, TCA_ATM_ADDR, sizeof(pvc), &pvc))
 631                        goto nla_put_failure;
 632                state = ATM_VF2VS(flow->vcc->flags);
 633                if (nla_put_u32(skb, TCA_ATM_STATE, state))
 634                        goto nla_put_failure;
 635        }
 636        if (flow->excess) {
 637                if (nla_put_u32(skb, TCA_ATM_EXCESS, flow->common.classid))
 638                        goto nla_put_failure;
 639        } else {
 640                if (nla_put_u32(skb, TCA_ATM_EXCESS, 0))
 641                        goto nla_put_failure;
 642        }
 643        return nla_nest_end(skb, nest);
 644
 645nla_put_failure:
 646        nla_nest_cancel(skb, nest);
 647        return -1;
 648}
 649static int
 650atm_tc_dump_class_stats(struct Qdisc *sch, unsigned long arg,
 651                        struct gnet_dump *d)
 652{
 653        struct atm_flow_data *flow = (struct atm_flow_data *)arg;
 654
 655        if (gnet_stats_copy_basic(qdisc_root_sleeping_running(sch),
 656                                  d, NULL, &flow->bstats) < 0 ||
 657            gnet_stats_copy_queue(d, NULL, &flow->qstats, flow->q->q.qlen) < 0)
 658                return -1;
 659
 660        return 0;
 661}
 662
 663static int atm_tc_dump(struct Qdisc *sch, struct sk_buff *skb)
 664{
 665        return 0;
 666}
 667
 668static const struct Qdisc_class_ops atm_class_ops = {
 669        .graft          = atm_tc_graft,
 670        .leaf           = atm_tc_leaf,
 671        .find           = atm_tc_find,
 672        .change         = atm_tc_change,
 673        .delete         = atm_tc_delete,
 674        .walk           = atm_tc_walk,
 675        .tcf_block      = atm_tc_tcf_block,
 676        .bind_tcf       = atm_tc_bind_filter,
 677        .unbind_tcf     = atm_tc_put,
 678        .dump           = atm_tc_dump_class,
 679        .dump_stats     = atm_tc_dump_class_stats,
 680};
 681
 682static struct Qdisc_ops atm_qdisc_ops __read_mostly = {
 683        .cl_ops         = &atm_class_ops,
 684        .id             = "atm",
 685        .priv_size      = sizeof(struct atm_qdisc_data),
 686        .enqueue        = atm_tc_enqueue,
 687        .dequeue        = atm_tc_dequeue,
 688        .peek           = atm_tc_peek,
 689        .init           = atm_tc_init,
 690        .reset          = atm_tc_reset,
 691        .destroy        = atm_tc_destroy,
 692        .dump           = atm_tc_dump,
 693        .owner          = THIS_MODULE,
 694};
 695
 696static int __init atm_init(void)
 697{
 698        return register_qdisc(&atm_qdisc_ops);
 699}
 700
 701static void __exit atm_exit(void)
 702{
 703        unregister_qdisc(&atm_qdisc_ops);
 704}
 705
 706module_init(atm_init)
 707module_exit(atm_exit)
 708MODULE_LICENSE("GPL");
 709
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