linux/net/atm/common.c
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   1/* net/atm/common.c - ATM sockets (common part for PVC and SVC) */
   2
   3/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   4
   5#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   6
   7#include <linux/module.h>
   8#include <linux/kmod.h>
   9#include <linux/net.h>          /* struct socket, struct proto_ops */
  10#include <linux/atm.h>          /* ATM stuff */
  11#include <linux/atmdev.h>
  12#include <linux/socket.h>       /* SOL_SOCKET */
  13#include <linux/errno.h>        /* error codes */
  14#include <linux/capability.h>
  15#include <linux/mm.h>
  16#include <linux/sched.h>
  17#include <linux/time.h>         /* struct timeval */
  18#include <linux/skbuff.h>
  19#include <linux/bitops.h>
  20#include <linux/init.h>
  21#include <linux/slab.h>
  22#include <net/sock.h>           /* struct sock */
  23#include <linux/uaccess.h>
  24#include <linux/poll.h>
  25
  26#include <linux/atomic.h>
  27
  28#include "resources.h"          /* atm_find_dev */
  29#include "common.h"             /* prototypes */
  30#include "protocols.h"          /* atm_init_<transport> */
  31#include "addr.h"               /* address registry */
  32#include "signaling.h"          /* for WAITING and sigd_attach */
  33
  34struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
  35EXPORT_SYMBOL(vcc_hash);
  36
  37DEFINE_RWLOCK(vcc_sklist_lock);
  38EXPORT_SYMBOL(vcc_sklist_lock);
  39
  40static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
  41
  42static void __vcc_insert_socket(struct sock *sk)
  43{
  44        struct atm_vcc *vcc = atm_sk(sk);
  45        struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)];
  46        sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
  47        sk_add_node(sk, head);
  48}
  49
  50void vcc_insert_socket(struct sock *sk)
  51{
  52        write_lock_irq(&vcc_sklist_lock);
  53        __vcc_insert_socket(sk);
  54        write_unlock_irq(&vcc_sklist_lock);
  55}
  56EXPORT_SYMBOL(vcc_insert_socket);
  57
  58static void vcc_remove_socket(struct sock *sk)
  59{
  60        write_lock_irq(&vcc_sklist_lock);
  61        sk_del_node_init(sk);
  62        write_unlock_irq(&vcc_sklist_lock);
  63}
  64
  65static struct sk_buff *alloc_tx(struct atm_vcc *vcc, unsigned int size)
  66{
  67        struct sk_buff *skb;
  68        struct sock *sk = sk_atm(vcc);
  69
  70        if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) {
  71                pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
  72                         sk_wmem_alloc_get(sk), size, sk->sk_sndbuf);
  73                return NULL;
  74        }
  75        while (!(skb = alloc_skb(size, GFP_KERNEL)))
  76                schedule();
  77        pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
  78        atomic_add(skb->truesize, &sk->sk_wmem_alloc);
  79        return skb;
  80}
  81
  82static void vcc_sock_destruct(struct sock *sk)
  83{
  84        if (atomic_read(&sk->sk_rmem_alloc))
  85                printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
  86                       __func__, atomic_read(&sk->sk_rmem_alloc));
  87
  88        if (atomic_read(&sk->sk_wmem_alloc))
  89                printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
  90                       __func__, atomic_read(&sk->sk_wmem_alloc));
  91}
  92
  93static void vcc_def_wakeup(struct sock *sk)
  94{
  95        struct socket_wq *wq;
  96
  97        rcu_read_lock();
  98        wq = rcu_dereference(sk->sk_wq);
  99        if (wq_has_sleeper(wq))
 100                wake_up(&wq->wait);
 101        rcu_read_unlock();
 102}
 103
 104static inline int vcc_writable(struct sock *sk)
 105{
 106        struct atm_vcc *vcc = atm_sk(sk);
 107
 108        return (vcc->qos.txtp.max_sdu +
 109                atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
 110}
 111
 112static void vcc_write_space(struct sock *sk)
 113{
 114        struct socket_wq *wq;
 115
 116        rcu_read_lock();
 117
 118        if (vcc_writable(sk)) {
 119                wq = rcu_dereference(sk->sk_wq);
 120                if (wq_has_sleeper(wq))
 121                        wake_up_interruptible(&wq->wait);
 122
 123                sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 124        }
 125
 126        rcu_read_unlock();
 127}
 128
 129static void vcc_release_cb(struct sock *sk)
 130{
 131        struct atm_vcc *vcc = atm_sk(sk);
 132
 133        if (vcc->release_cb)
 134                vcc->release_cb(vcc);
 135}
 136
 137static struct proto vcc_proto = {
 138        .name     = "VCC",
 139        .owner    = THIS_MODULE,
 140        .obj_size = sizeof(struct atm_vcc),
 141        .release_cb = vcc_release_cb,
 142};
 143
 144int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
 145{
 146        struct sock *sk;
 147        struct atm_vcc *vcc;
 148
 149        sock->sk = NULL;
 150        if (sock->type == SOCK_STREAM)
 151                return -EINVAL;
 152        sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto);
 153        if (!sk)
 154                return -ENOMEM;
 155        sock_init_data(sock, sk);
 156        sk->sk_state_change = vcc_def_wakeup;
 157        sk->sk_write_space = vcc_write_space;
 158
 159        vcc = atm_sk(sk);
 160        vcc->dev = NULL;
 161        memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
 162        memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
 163        vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
 164        atomic_set(&sk->sk_wmem_alloc, 1);
 165        atomic_set(&sk->sk_rmem_alloc, 0);
 166        vcc->push = NULL;
 167        vcc->pop = NULL;
 168        vcc->owner = NULL;
 169        vcc->push_oam = NULL;
 170        vcc->release_cb = NULL;
 171        vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
 172        vcc->atm_options = vcc->aal_options = 0;
 173        sk->sk_destruct = vcc_sock_destruct;
 174        return 0;
 175}
 176
 177static void vcc_destroy_socket(struct sock *sk)
 178{
 179        struct atm_vcc *vcc = atm_sk(sk);
 180        struct sk_buff *skb;
 181
 182        set_bit(ATM_VF_CLOSE, &vcc->flags);
 183        clear_bit(ATM_VF_READY, &vcc->flags);
 184        if (vcc->dev) {
 185                if (vcc->dev->ops->close)
 186                        vcc->dev->ops->close(vcc);
 187                if (vcc->push)
 188                        vcc->push(vcc, NULL); /* atmarpd has no push */
 189                module_put(vcc->owner);
 190
 191                while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 192                        atm_return(vcc, skb->truesize);
 193                        kfree_skb(skb);
 194                }
 195
 196                module_put(vcc->dev->ops->owner);
 197                atm_dev_put(vcc->dev);
 198        }
 199
 200        vcc_remove_socket(sk);
 201}
 202
 203int vcc_release(struct socket *sock)
 204{
 205        struct sock *sk = sock->sk;
 206
 207        if (sk) {
 208                lock_sock(sk);
 209                vcc_destroy_socket(sock->sk);
 210                release_sock(sk);
 211                sock_put(sk);
 212        }
 213
 214        return 0;
 215}
 216
 217void vcc_release_async(struct atm_vcc *vcc, int reply)
 218{
 219        struct sock *sk = sk_atm(vcc);
 220
 221        set_bit(ATM_VF_CLOSE, &vcc->flags);
 222        sk->sk_shutdown |= RCV_SHUTDOWN;
 223        sk->sk_err = -reply;
 224        clear_bit(ATM_VF_WAITING, &vcc->flags);
 225        sk->sk_state_change(sk);
 226}
 227EXPORT_SYMBOL(vcc_release_async);
 228
 229void vcc_process_recv_queue(struct atm_vcc *vcc)
 230{
 231        struct sk_buff_head queue, *rq;
 232        struct sk_buff *skb, *tmp;
 233        unsigned long flags;
 234
 235        __skb_queue_head_init(&queue);
 236        rq = &sk_atm(vcc)->sk_receive_queue;
 237
 238        spin_lock_irqsave(&rq->lock, flags);
 239        skb_queue_splice_init(rq, &queue);
 240        spin_unlock_irqrestore(&rq->lock, flags);
 241
 242        skb_queue_walk_safe(&queue, skb, tmp) {
 243                __skb_unlink(skb, &queue);
 244                vcc->push(vcc, skb);
 245        }
 246}
 247EXPORT_SYMBOL(vcc_process_recv_queue);
 248
 249void atm_dev_signal_change(struct atm_dev *dev, char signal)
 250{
 251        pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
 252                __func__, signal, dev, dev->number, dev->signal);
 253
 254        /* atm driver sending invalid signal */
 255        WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
 256
 257        if (dev->signal == signal)
 258                return; /* no change */
 259
 260        dev->signal = signal;
 261
 262        atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
 263}
 264EXPORT_SYMBOL(atm_dev_signal_change);
 265
 266void atm_dev_release_vccs(struct atm_dev *dev)
 267{
 268        int i;
 269
 270        write_lock_irq(&vcc_sklist_lock);
 271        for (i = 0; i < VCC_HTABLE_SIZE; i++) {
 272                struct hlist_head *head = &vcc_hash[i];
 273                struct hlist_node *tmp;
 274                struct sock *s;
 275                struct atm_vcc *vcc;
 276
 277                sk_for_each_safe(s, tmp, head) {
 278                        vcc = atm_sk(s);
 279                        if (vcc->dev == dev) {
 280                                vcc_release_async(vcc, -EPIPE);
 281                                sk_del_node_init(s);
 282                        }
 283                }
 284        }
 285        write_unlock_irq(&vcc_sklist_lock);
 286}
 287EXPORT_SYMBOL(atm_dev_release_vccs);
 288
 289static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
 290{
 291        int max_sdu;
 292
 293        if (!tp->traffic_class)
 294                return 0;
 295        switch (aal) {
 296        case ATM_AAL0:
 297                max_sdu = ATM_CELL_SIZE-1;
 298                break;
 299        case ATM_AAL34:
 300                max_sdu = ATM_MAX_AAL34_PDU;
 301                break;
 302        default:
 303                pr_warning("AAL problems ... (%d)\n", aal);
 304                /* fall through */
 305        case ATM_AAL5:
 306                max_sdu = ATM_MAX_AAL5_PDU;
 307        }
 308        if (!tp->max_sdu)
 309                tp->max_sdu = max_sdu;
 310        else if (tp->max_sdu > max_sdu)
 311                return -EINVAL;
 312        if (!tp->max_cdv)
 313                tp->max_cdv = ATM_MAX_CDV;
 314        return 0;
 315}
 316
 317static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
 318{
 319        struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
 320        struct sock *s;
 321        struct atm_vcc *walk;
 322
 323        sk_for_each(s, head) {
 324                walk = atm_sk(s);
 325                if (walk->dev != vcc->dev)
 326                        continue;
 327                if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
 328                    walk->vci == vci && ((walk->qos.txtp.traffic_class !=
 329                    ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
 330                    (walk->qos.rxtp.traffic_class != ATM_NONE &&
 331                    vcc->qos.rxtp.traffic_class != ATM_NONE)))
 332                        return -EADDRINUSE;
 333        }
 334
 335        /* allow VCCs with same VPI/VCI iff they don't collide on
 336           TX/RX (but we may refuse such sharing for other reasons,
 337           e.g. if protocol requires to have both channels) */
 338
 339        return 0;
 340}
 341
 342static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
 343{
 344        static short p;        /* poor man's per-device cache */
 345        static int c;
 346        short old_p;
 347        int old_c;
 348        int err;
 349
 350        if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
 351                err = check_ci(vcc, *vpi, *vci);
 352                return err;
 353        }
 354        /* last scan may have left values out of bounds for current device */
 355        if (*vpi != ATM_VPI_ANY)
 356                p = *vpi;
 357        else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
 358                p = 0;
 359        if (*vci != ATM_VCI_ANY)
 360                c = *vci;
 361        else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
 362                        c = ATM_NOT_RSV_VCI;
 363        old_p = p;
 364        old_c = c;
 365        do {
 366                if (!check_ci(vcc, p, c)) {
 367                        *vpi = p;
 368                        *vci = c;
 369                        return 0;
 370                }
 371                if (*vci == ATM_VCI_ANY) {
 372                        c++;
 373                        if (c >= 1 << vcc->dev->ci_range.vci_bits)
 374                                c = ATM_NOT_RSV_VCI;
 375                }
 376                if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
 377                    *vpi == ATM_VPI_ANY) {
 378                        p++;
 379                        if (p >= 1 << vcc->dev->ci_range.vpi_bits)
 380                                p = 0;
 381                }
 382        } while (old_p != p || old_c != c);
 383        return -EADDRINUSE;
 384}
 385
 386static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
 387                         int vci)
 388{
 389        struct sock *sk = sk_atm(vcc);
 390        int error;
 391
 392        if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
 393            vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
 394            vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
 395                return -EINVAL;
 396        if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
 397                return -EPERM;
 398        error = -ENODEV;
 399        if (!try_module_get(dev->ops->owner))
 400                return error;
 401        vcc->dev = dev;
 402        write_lock_irq(&vcc_sklist_lock);
 403        if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
 404            (error = find_ci(vcc, &vpi, &vci))) {
 405                write_unlock_irq(&vcc_sklist_lock);
 406                goto fail_module_put;
 407        }
 408        vcc->vpi = vpi;
 409        vcc->vci = vci;
 410        __vcc_insert_socket(sk);
 411        write_unlock_irq(&vcc_sklist_lock);
 412        switch (vcc->qos.aal) {
 413        case ATM_AAL0:
 414                error = atm_init_aal0(vcc);
 415                vcc->stats = &dev->stats.aal0;
 416                break;
 417        case ATM_AAL34:
 418                error = atm_init_aal34(vcc);
 419                vcc->stats = &dev->stats.aal34;
 420                break;
 421        case ATM_NO_AAL:
 422                /* ATM_AAL5 is also used in the "0 for default" case */
 423                vcc->qos.aal = ATM_AAL5;
 424                /* fall through */
 425        case ATM_AAL5:
 426                error = atm_init_aal5(vcc);
 427                vcc->stats = &dev->stats.aal5;
 428                break;
 429        default:
 430                error = -EPROTOTYPE;
 431        }
 432        if (!error)
 433                error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
 434        if (!error)
 435                error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
 436        if (error)
 437                goto fail;
 438        pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
 439        pr_debug("  TX: %d, PCR %d..%d, SDU %d\n",
 440                 vcc->qos.txtp.traffic_class,
 441                 vcc->qos.txtp.min_pcr,
 442                 vcc->qos.txtp.max_pcr,
 443                 vcc->qos.txtp.max_sdu);
 444        pr_debug("  RX: %d, PCR %d..%d, SDU %d\n",
 445                 vcc->qos.rxtp.traffic_class,
 446                 vcc->qos.rxtp.min_pcr,
 447                 vcc->qos.rxtp.max_pcr,
 448                 vcc->qos.rxtp.max_sdu);
 449
 450        if (dev->ops->open) {
 451                error = dev->ops->open(vcc);
 452                if (error)
 453                        goto fail;
 454        }
 455        return 0;
 456
 457fail:
 458        vcc_remove_socket(sk);
 459fail_module_put:
 460        module_put(dev->ops->owner);
 461        /* ensure we get dev module ref count correct */
 462        vcc->dev = NULL;
 463        return error;
 464}
 465
 466int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
 467{
 468        struct atm_dev *dev;
 469        struct atm_vcc *vcc = ATM_SD(sock);
 470        int error;
 471
 472        pr_debug("(vpi %d, vci %d)\n", vpi, vci);
 473        if (sock->state == SS_CONNECTED)
 474                return -EISCONN;
 475        if (sock->state != SS_UNCONNECTED)
 476                return -EINVAL;
 477        if (!(vpi || vci))
 478                return -EINVAL;
 479
 480        if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
 481                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 482        else
 483                if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
 484                        return -EINVAL;
 485        pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
 486                 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
 487                 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
 488                 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
 489                 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
 490                 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
 491                 vcc->qos.aal == ATM_AAL5 ? "" :
 492                 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
 493                 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
 494        if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
 495                return -EBADFD;
 496        if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
 497            vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
 498                return -EINVAL;
 499        if (likely(itf != ATM_ITF_ANY)) {
 500                dev = try_then_request_module(atm_dev_lookup(itf),
 501                                              "atm-device-%d", itf);
 502        } else {
 503                dev = NULL;
 504                mutex_lock(&atm_dev_mutex);
 505                if (!list_empty(&atm_devs)) {
 506                        dev = list_entry(atm_devs.next,
 507                                         struct atm_dev, dev_list);
 508                        atm_dev_hold(dev);
 509                }
 510                mutex_unlock(&atm_dev_mutex);
 511        }
 512        if (!dev)
 513                return -ENODEV;
 514        error = __vcc_connect(vcc, dev, vpi, vci);
 515        if (error) {
 516                atm_dev_put(dev);
 517                return error;
 518        }
 519        if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
 520                set_bit(ATM_VF_PARTIAL, &vcc->flags);
 521        if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
 522                sock->state = SS_CONNECTED;
 523        return 0;
 524}
 525
 526int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 527                size_t size, int flags)
 528{
 529        struct sock *sk = sock->sk;
 530        struct atm_vcc *vcc;
 531        struct sk_buff *skb;
 532        int copied, error = -EINVAL;
 533
 534        if (sock->state != SS_CONNECTED)
 535                return -ENOTCONN;
 536
 537        /* only handle MSG_DONTWAIT and MSG_PEEK */
 538        if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
 539                return -EOPNOTSUPP;
 540
 541        vcc = ATM_SD(sock);
 542        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 543            test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 544            !test_bit(ATM_VF_READY, &vcc->flags))
 545                return 0;
 546
 547        skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
 548        if (!skb)
 549                return error;
 550
 551        copied = skb->len;
 552        if (copied > size) {
 553                copied = size;
 554                msg->msg_flags |= MSG_TRUNC;
 555        }
 556
 557        error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 558        if (error)
 559                return error;
 560        sock_recv_ts_and_drops(msg, sk, skb);
 561
 562        if (!(flags & MSG_PEEK)) {
 563                pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
 564                         skb->truesize);
 565                atm_return(vcc, skb->truesize);
 566        }
 567
 568        skb_free_datagram(sk, skb);
 569        return copied;
 570}
 571
 572int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
 573                size_t total_len)
 574{
 575        struct sock *sk = sock->sk;
 576        DEFINE_WAIT(wait);
 577        struct atm_vcc *vcc;
 578        struct sk_buff *skb;
 579        int eff, error;
 580        const void __user *buff;
 581        int size;
 582
 583        lock_sock(sk);
 584        if (sock->state != SS_CONNECTED) {
 585                error = -ENOTCONN;
 586                goto out;
 587        }
 588        if (m->msg_name) {
 589                error = -EISCONN;
 590                goto out;
 591        }
 592        if (m->msg_iovlen != 1) {
 593                error = -ENOSYS; /* fix this later @@@ */
 594                goto out;
 595        }
 596        buff = m->msg_iov->iov_base;
 597        size = m->msg_iov->iov_len;
 598        vcc = ATM_SD(sock);
 599        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 600            test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 601            !test_bit(ATM_VF_READY, &vcc->flags)) {
 602                error = -EPIPE;
 603                send_sig(SIGPIPE, current, 0);
 604                goto out;
 605        }
 606        if (!size) {
 607                error = 0;
 608                goto out;
 609        }
 610        if (size < 0 || size > vcc->qos.txtp.max_sdu) {
 611                error = -EMSGSIZE;
 612                goto out;
 613        }
 614
 615        eff = (size+3) & ~3; /* align to word boundary */
 616        prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 617        error = 0;
 618        while (!(skb = alloc_tx(vcc, eff))) {
 619                if (m->msg_flags & MSG_DONTWAIT) {
 620                        error = -EAGAIN;
 621                        break;
 622                }
 623                schedule();
 624                if (signal_pending(current)) {
 625                        error = -ERESTARTSYS;
 626                        break;
 627                }
 628                if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 629                    test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 630                    !test_bit(ATM_VF_READY, &vcc->flags)) {
 631                        error = -EPIPE;
 632                        send_sig(SIGPIPE, current, 0);
 633                        break;
 634                }
 635                prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 636        }
 637        finish_wait(sk_sleep(sk), &wait);
 638        if (error)
 639                goto out;
 640        skb->dev = NULL; /* for paths shared with net_device interfaces */
 641        ATM_SKB(skb)->atm_options = vcc->atm_options;
 642        if (copy_from_user(skb_put(skb, size), buff, size)) {
 643                kfree_skb(skb);
 644                error = -EFAULT;
 645                goto out;
 646        }
 647        if (eff != size)
 648                memset(skb->data + size, 0, eff-size);
 649        error = vcc->dev->ops->send(vcc, skb);
 650        error = error ? error : size;
 651out:
 652        release_sock(sk);
 653        return error;
 654}
 655
 656unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
 657{
 658        struct sock *sk = sock->sk;
 659        struct atm_vcc *vcc;
 660        unsigned int mask;
 661
 662        sock_poll_wait(file, sk_sleep(sk), wait);
 663        mask = 0;
 664
 665        vcc = ATM_SD(sock);
 666
 667        /* exceptional events */
 668        if (sk->sk_err)
 669                mask = POLLERR;
 670
 671        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 672            test_bit(ATM_VF_CLOSE, &vcc->flags))
 673                mask |= POLLHUP;
 674
 675        /* readable? */
 676        if (!skb_queue_empty(&sk->sk_receive_queue))
 677                mask |= POLLIN | POLLRDNORM;
 678
 679        /* writable? */
 680        if (sock->state == SS_CONNECTING &&
 681            test_bit(ATM_VF_WAITING, &vcc->flags))
 682                return mask;
 683
 684        if (vcc->qos.txtp.traffic_class != ATM_NONE &&
 685            vcc_writable(sk))
 686                mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
 687
 688        return mask;
 689}
 690
 691static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
 692{
 693        int error;
 694
 695        /*
 696         * Don't let the QoS change the already connected AAL type nor the
 697         * traffic class.
 698         */
 699        if (qos->aal != vcc->qos.aal ||
 700            qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
 701            qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
 702                return -EINVAL;
 703        error = adjust_tp(&qos->txtp, qos->aal);
 704        if (!error)
 705                error = adjust_tp(&qos->rxtp, qos->aal);
 706        if (error)
 707                return error;
 708        if (!vcc->dev->ops->change_qos)
 709                return -EOPNOTSUPP;
 710        if (sk_atm(vcc)->sk_family == AF_ATMPVC)
 711                return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
 712        return svc_change_qos(vcc, qos);
 713}
 714
 715static int check_tp(const struct atm_trafprm *tp)
 716{
 717        /* @@@ Should be merged with adjust_tp */
 718        if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
 719                return 0;
 720        if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
 721            !tp->max_pcr)
 722                return -EINVAL;
 723        if (tp->min_pcr == ATM_MAX_PCR)
 724                return -EINVAL;
 725        if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
 726            tp->min_pcr > tp->max_pcr)
 727                return -EINVAL;
 728        /*
 729         * We allow pcr to be outside [min_pcr,max_pcr], because later
 730         * adjustment may still push it in the valid range.
 731         */
 732        return 0;
 733}
 734
 735static int check_qos(const struct atm_qos *qos)
 736{
 737        int error;
 738
 739        if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
 740                return -EINVAL;
 741        if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
 742            qos->txtp.traffic_class && qos->rxtp.traffic_class &&
 743            qos->txtp.traffic_class != ATM_ANYCLASS &&
 744            qos->rxtp.traffic_class != ATM_ANYCLASS)
 745                return -EINVAL;
 746        error = check_tp(&qos->txtp);
 747        if (error)
 748                return error;
 749        return check_tp(&qos->rxtp);
 750}
 751
 752int vcc_setsockopt(struct socket *sock, int level, int optname,
 753                   char __user *optval, unsigned int optlen)
 754{
 755        struct atm_vcc *vcc;
 756        unsigned long value;
 757        int error;
 758
 759        if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
 760                return -EINVAL;
 761
 762        vcc = ATM_SD(sock);
 763        switch (optname) {
 764        case SO_ATMQOS:
 765        {
 766                struct atm_qos qos;
 767
 768                if (copy_from_user(&qos, optval, sizeof(qos)))
 769                        return -EFAULT;
 770                error = check_qos(&qos);
 771                if (error)
 772                        return error;
 773                if (sock->state == SS_CONNECTED)
 774                        return atm_change_qos(vcc, &qos);
 775                if (sock->state != SS_UNCONNECTED)
 776                        return -EBADFD;
 777                vcc->qos = qos;
 778                set_bit(ATM_VF_HASQOS, &vcc->flags);
 779                return 0;
 780        }
 781        case SO_SETCLP:
 782                if (get_user(value, (unsigned long __user *)optval))
 783                        return -EFAULT;
 784                if (value)
 785                        vcc->atm_options |= ATM_ATMOPT_CLP;
 786                else
 787                        vcc->atm_options &= ~ATM_ATMOPT_CLP;
 788                return 0;
 789        default:
 790                if (level == SOL_SOCKET)
 791                        return -EINVAL;
 792                break;
 793        }
 794        if (!vcc->dev || !vcc->dev->ops->setsockopt)
 795                return -EINVAL;
 796        return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
 797}
 798
 799int vcc_getsockopt(struct socket *sock, int level, int optname,
 800                   char __user *optval, int __user *optlen)
 801{
 802        struct atm_vcc *vcc;
 803        int len;
 804
 805        if (get_user(len, optlen))
 806                return -EFAULT;
 807        if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
 808                return -EINVAL;
 809
 810        vcc = ATM_SD(sock);
 811        switch (optname) {
 812        case SO_ATMQOS:
 813                if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
 814                        return -EINVAL;
 815                return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
 816                        ? -EFAULT : 0;
 817        case SO_SETCLP:
 818                return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
 819                                (unsigned long __user *)optval) ? -EFAULT : 0;
 820        case SO_ATMPVC:
 821        {
 822                struct sockaddr_atmpvc pvc;
 823
 824                if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
 825                        return -ENOTCONN;
 826                memset(&pvc, 0, sizeof(pvc));
 827                pvc.sap_family = AF_ATMPVC;
 828                pvc.sap_addr.itf = vcc->dev->number;
 829                pvc.sap_addr.vpi = vcc->vpi;
 830                pvc.sap_addr.vci = vcc->vci;
 831                return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
 832        }
 833        default:
 834                if (level == SOL_SOCKET)
 835                        return -EINVAL;
 836                break;
 837        }
 838        if (!vcc->dev || !vcc->dev->ops->getsockopt)
 839                return -EINVAL;
 840        return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
 841}
 842
 843int register_atmdevice_notifier(struct notifier_block *nb)
 844{
 845        return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
 846}
 847EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
 848
 849void unregister_atmdevice_notifier(struct notifier_block *nb)
 850{
 851        atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
 852}
 853EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
 854
 855static int __init atm_init(void)
 856{
 857        int error;
 858
 859        error = proto_register(&vcc_proto, 0);
 860        if (error < 0)
 861                goto out;
 862        error = atmpvc_init();
 863        if (error < 0) {
 864                pr_err("atmpvc_init() failed with %d\n", error);
 865                goto out_unregister_vcc_proto;
 866        }
 867        error = atmsvc_init();
 868        if (error < 0) {
 869                pr_err("atmsvc_init() failed with %d\n", error);
 870                goto out_atmpvc_exit;
 871        }
 872        error = atm_proc_init();
 873        if (error < 0) {
 874                pr_err("atm_proc_init() failed with %d\n", error);
 875                goto out_atmsvc_exit;
 876        }
 877        error = atm_sysfs_init();
 878        if (error < 0) {
 879                pr_err("atm_sysfs_init() failed with %d\n", error);
 880                goto out_atmproc_exit;
 881        }
 882out:
 883        return error;
 884out_atmproc_exit:
 885        atm_proc_exit();
 886out_atmsvc_exit:
 887        atmsvc_exit();
 888out_atmpvc_exit:
 889        atmsvc_exit();
 890out_unregister_vcc_proto:
 891        proto_unregister(&vcc_proto);
 892        goto out;
 893}
 894
 895static void __exit atm_exit(void)
 896{
 897        atm_proc_exit();
 898        atm_sysfs_exit();
 899        atmsvc_exit();
 900        atmpvc_exit();
 901        proto_unregister(&vcc_proto);
 902}
 903
 904subsys_initcall(atm_init);
 905
 906module_exit(atm_exit);
 907
 908MODULE_LICENSE("GPL");
 909MODULE_ALIAS_NETPROTO(PF_ATMPVC);
 910MODULE_ALIAS_NETPROTO(PF_ATMSVC);
 911