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