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