linux/net/atm/common.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/* net/atm/common.c - ATM sockets (common part for PVC and SVC) */
   3
   4/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
   5
   6#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
   7
   8#include <linux/module.h>
   9#include <linux/kmod.h>
  10#include <linux/net.h>          /* struct socket, struct proto_ops */
  11#include <linux/atm.h>          /* ATM stuff */
  12#include <linux/atmdev.h>
  13#include <linux/socket.h>       /* SOL_SOCKET */
  14#include <linux/errno.h>        /* error codes */
  15#include <linux/capability.h>
  16#include <linux/mm.h>
  17#include <linux/sched/signal.h>
  18#include <linux/time64.h>       /* 64-bit time for seconds */
  19#include <linux/skbuff.h>
  20#include <linux/bitops.h>
  21#include <linux/init.h>
  22#include <linux/slab.h>
  23#include <net/sock.h>           /* struct sock */
  24#include <linux/uaccess.h>
  25#include <linux/poll.h>
  26
  27#include <linux/atomic.h>
  28
  29#include "resources.h"          /* atm_find_dev */
  30#include "common.h"             /* prototypes */
  31#include "protocols.h"          /* atm_init_<transport> */
  32#include "addr.h"               /* address registry */
  33#include "signaling.h"          /* for WAITING and sigd_attach */
  34
  35struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
  36EXPORT_SYMBOL(vcc_hash);
  37
  38DEFINE_RWLOCK(vcc_sklist_lock);
  39EXPORT_SYMBOL(vcc_sklist_lock);
  40
  41static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
  42
  43static void __vcc_insert_socket(struct sock *sk)
  44{
  45        struct atm_vcc *vcc = atm_sk(sk);
  46        struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)];
  47        sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1);
  48        sk_add_node(sk, head);
  49}
  50
  51void vcc_insert_socket(struct sock *sk)
  52{
  53        write_lock_irq(&vcc_sklist_lock);
  54        __vcc_insert_socket(sk);
  55        write_unlock_irq(&vcc_sklist_lock);
  56}
  57EXPORT_SYMBOL(vcc_insert_socket);
  58
  59static void vcc_remove_socket(struct sock *sk)
  60{
  61        write_lock_irq(&vcc_sklist_lock);
  62        sk_del_node_init(sk);
  63        write_unlock_irq(&vcc_sklist_lock);
  64}
  65
  66static bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size)
  67{
  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 false;
  74        }
  75        return true;
  76}
  77
  78static void vcc_sock_destruct(struct sock *sk)
  79{
  80        if (atomic_read(&sk->sk_rmem_alloc))
  81                printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
  82                       __func__, atomic_read(&sk->sk_rmem_alloc));
  83
  84        if (refcount_read(&sk->sk_wmem_alloc))
  85                printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
  86                       __func__, refcount_read(&sk->sk_wmem_alloc));
  87}
  88
  89static void vcc_def_wakeup(struct sock *sk)
  90{
  91        struct socket_wq *wq;
  92
  93        rcu_read_lock();
  94        wq = rcu_dereference(sk->sk_wq);
  95        if (skwq_has_sleeper(wq))
  96                wake_up(&wq->wait);
  97        rcu_read_unlock();
  98}
  99
 100static inline int vcc_writable(struct sock *sk)
 101{
 102        struct atm_vcc *vcc = atm_sk(sk);
 103
 104        return (vcc->qos.txtp.max_sdu +
 105                refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
 106}
 107
 108static void vcc_write_space(struct sock *sk)
 109{
 110        struct socket_wq *wq;
 111
 112        rcu_read_lock();
 113
 114        if (vcc_writable(sk)) {
 115                wq = rcu_dereference(sk->sk_wq);
 116                if (skwq_has_sleeper(wq))
 117                        wake_up_interruptible(&wq->wait);
 118
 119                sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 120        }
 121
 122        rcu_read_unlock();
 123}
 124
 125static void vcc_release_cb(struct sock *sk)
 126{
 127        struct atm_vcc *vcc = atm_sk(sk);
 128
 129        if (vcc->release_cb)
 130                vcc->release_cb(vcc);
 131}
 132
 133static struct proto vcc_proto = {
 134        .name     = "VCC",
 135        .owner    = THIS_MODULE,
 136        .obj_size = sizeof(struct atm_vcc),
 137        .release_cb = vcc_release_cb,
 138};
 139
 140int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
 141{
 142        struct sock *sk;
 143        struct atm_vcc *vcc;
 144
 145        sock->sk = NULL;
 146        if (sock->type == SOCK_STREAM)
 147                return -EINVAL;
 148        sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern);
 149        if (!sk)
 150                return -ENOMEM;
 151        sock_init_data(sock, sk);
 152        sk->sk_state_change = vcc_def_wakeup;
 153        sk->sk_write_space = vcc_write_space;
 154
 155        vcc = atm_sk(sk);
 156        vcc->dev = NULL;
 157        memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
 158        memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
 159        vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
 160        refcount_set(&sk->sk_wmem_alloc, 1);
 161        atomic_set(&sk->sk_rmem_alloc, 0);
 162        vcc->push = NULL;
 163        vcc->pop = NULL;
 164        vcc->owner = NULL;
 165        vcc->push_oam = NULL;
 166        vcc->release_cb = NULL;
 167        vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
 168        vcc->atm_options = vcc->aal_options = 0;
 169        sk->sk_destruct = vcc_sock_destruct;
 170        return 0;
 171}
 172
 173static void vcc_destroy_socket(struct sock *sk)
 174{
 175        struct atm_vcc *vcc = atm_sk(sk);
 176        struct sk_buff *skb;
 177
 178        set_bit(ATM_VF_CLOSE, &vcc->flags);
 179        clear_bit(ATM_VF_READY, &vcc->flags);
 180        if (vcc->dev) {
 181                if (vcc->dev->ops->close)
 182                        vcc->dev->ops->close(vcc);
 183                if (vcc->push)
 184                        vcc->push(vcc, NULL); /* atmarpd has no push */
 185                module_put(vcc->owner);
 186
 187                while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 188                        atm_return(vcc, skb->truesize);
 189                        kfree_skb(skb);
 190                }
 191
 192                module_put(vcc->dev->ops->owner);
 193                atm_dev_put(vcc->dev);
 194        }
 195
 196        vcc_remove_socket(sk);
 197}
 198
 199int vcc_release(struct socket *sock)
 200{
 201        struct sock *sk = sock->sk;
 202
 203        if (sk) {
 204                lock_sock(sk);
 205                vcc_destroy_socket(sock->sk);
 206                release_sock(sk);
 207                sock_put(sk);
 208        }
 209
 210        return 0;
 211}
 212
 213void vcc_release_async(struct atm_vcc *vcc, int reply)
 214{
 215        struct sock *sk = sk_atm(vcc);
 216
 217        set_bit(ATM_VF_CLOSE, &vcc->flags);
 218        sk->sk_shutdown |= RCV_SHUTDOWN;
 219        sk->sk_err = -reply;
 220        clear_bit(ATM_VF_WAITING, &vcc->flags);
 221        sk->sk_state_change(sk);
 222}
 223EXPORT_SYMBOL(vcc_release_async);
 224
 225void vcc_process_recv_queue(struct atm_vcc *vcc)
 226{
 227        struct sk_buff_head queue, *rq;
 228        struct sk_buff *skb, *tmp;
 229        unsigned long flags;
 230
 231        __skb_queue_head_init(&queue);
 232        rq = &sk_atm(vcc)->sk_receive_queue;
 233
 234        spin_lock_irqsave(&rq->lock, flags);
 235        skb_queue_splice_init(rq, &queue);
 236        spin_unlock_irqrestore(&rq->lock, flags);
 237
 238        skb_queue_walk_safe(&queue, skb, tmp) {
 239                __skb_unlink(skb, &queue);
 240                vcc->push(vcc, skb);
 241        }
 242}
 243EXPORT_SYMBOL(vcc_process_recv_queue);
 244
 245void atm_dev_signal_change(struct atm_dev *dev, char signal)
 246{
 247        pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
 248                __func__, signal, dev, dev->number, dev->signal);
 249
 250        /* atm driver sending invalid signal */
 251        WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
 252
 253        if (dev->signal == signal)
 254                return; /* no change */
 255
 256        dev->signal = signal;
 257
 258        atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
 259}
 260EXPORT_SYMBOL(atm_dev_signal_change);
 261
 262void atm_dev_release_vccs(struct atm_dev *dev)
 263{
 264        int i;
 265
 266        write_lock_irq(&vcc_sklist_lock);
 267        for (i = 0; i < VCC_HTABLE_SIZE; i++) {
 268                struct hlist_head *head = &vcc_hash[i];
 269                struct hlist_node *tmp;
 270                struct sock *s;
 271                struct atm_vcc *vcc;
 272
 273                sk_for_each_safe(s, tmp, head) {
 274                        vcc = atm_sk(s);
 275                        if (vcc->dev == dev) {
 276                                vcc_release_async(vcc, -EPIPE);
 277                                sk_del_node_init(s);
 278                        }
 279                }
 280        }
 281        write_unlock_irq(&vcc_sklist_lock);
 282}
 283EXPORT_SYMBOL(atm_dev_release_vccs);
 284
 285static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
 286{
 287        int max_sdu;
 288
 289        if (!tp->traffic_class)
 290                return 0;
 291        switch (aal) {
 292        case ATM_AAL0:
 293                max_sdu = ATM_CELL_SIZE-1;
 294                break;
 295        case ATM_AAL34:
 296                max_sdu = ATM_MAX_AAL34_PDU;
 297                break;
 298        default:
 299                pr_warn("AAL problems ... (%d)\n", aal);
 300                /* fall through */
 301        case ATM_AAL5:
 302                max_sdu = ATM_MAX_AAL5_PDU;
 303        }
 304        if (!tp->max_sdu)
 305                tp->max_sdu = max_sdu;
 306        else if (tp->max_sdu > max_sdu)
 307                return -EINVAL;
 308        if (!tp->max_cdv)
 309                tp->max_cdv = ATM_MAX_CDV;
 310        return 0;
 311}
 312
 313static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
 314{
 315        struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
 316        struct sock *s;
 317        struct atm_vcc *walk;
 318
 319        sk_for_each(s, head) {
 320                walk = atm_sk(s);
 321                if (walk->dev != vcc->dev)
 322                        continue;
 323                if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
 324                    walk->vci == vci && ((walk->qos.txtp.traffic_class !=
 325                    ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
 326                    (walk->qos.rxtp.traffic_class != ATM_NONE &&
 327                    vcc->qos.rxtp.traffic_class != ATM_NONE)))
 328                        return -EADDRINUSE;
 329        }
 330
 331        /* allow VCCs with same VPI/VCI iff they don't collide on
 332           TX/RX (but we may refuse such sharing for other reasons,
 333           e.g. if protocol requires to have both channels) */
 334
 335        return 0;
 336}
 337
 338static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
 339{
 340        static short p;        /* poor man's per-device cache */
 341        static int c;
 342        short old_p;
 343        int old_c;
 344        int err;
 345
 346        if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
 347                err = check_ci(vcc, *vpi, *vci);
 348                return err;
 349        }
 350        /* last scan may have left values out of bounds for current device */
 351        if (*vpi != ATM_VPI_ANY)
 352                p = *vpi;
 353        else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
 354                p = 0;
 355        if (*vci != ATM_VCI_ANY)
 356                c = *vci;
 357        else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
 358                        c = ATM_NOT_RSV_VCI;
 359        old_p = p;
 360        old_c = c;
 361        do {
 362                if (!check_ci(vcc, p, c)) {
 363                        *vpi = p;
 364                        *vci = c;
 365                        return 0;
 366                }
 367                if (*vci == ATM_VCI_ANY) {
 368                        c++;
 369                        if (c >= 1 << vcc->dev->ci_range.vci_bits)
 370                                c = ATM_NOT_RSV_VCI;
 371                }
 372                if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
 373                    *vpi == ATM_VPI_ANY) {
 374                        p++;
 375                        if (p >= 1 << vcc->dev->ci_range.vpi_bits)
 376                                p = 0;
 377                }
 378        } while (old_p != p || old_c != c);
 379        return -EADDRINUSE;
 380}
 381
 382static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
 383                         int vci)
 384{
 385        struct sock *sk = sk_atm(vcc);
 386        int error;
 387
 388        if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
 389            vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
 390            vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
 391                return -EINVAL;
 392        if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
 393                return -EPERM;
 394        error = -ENODEV;
 395        if (!try_module_get(dev->ops->owner))
 396                return error;
 397        vcc->dev = dev;
 398        write_lock_irq(&vcc_sklist_lock);
 399        if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
 400            (error = find_ci(vcc, &vpi, &vci))) {
 401                write_unlock_irq(&vcc_sklist_lock);
 402                goto fail_module_put;
 403        }
 404        vcc->vpi = vpi;
 405        vcc->vci = vci;
 406        __vcc_insert_socket(sk);
 407        write_unlock_irq(&vcc_sklist_lock);
 408        switch (vcc->qos.aal) {
 409        case ATM_AAL0:
 410                error = atm_init_aal0(vcc);
 411                vcc->stats = &dev->stats.aal0;
 412                break;
 413        case ATM_AAL34:
 414                error = atm_init_aal34(vcc);
 415                vcc->stats = &dev->stats.aal34;
 416                break;
 417        case ATM_NO_AAL:
 418                /* ATM_AAL5 is also used in the "0 for default" case */
 419                vcc->qos.aal = ATM_AAL5;
 420                /* fall through */
 421        case ATM_AAL5:
 422                error = atm_init_aal5(vcc);
 423                vcc->stats = &dev->stats.aal5;
 424                break;
 425        default:
 426                error = -EPROTOTYPE;
 427        }
 428        if (!error)
 429                error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
 430        if (!error)
 431                error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
 432        if (error)
 433                goto fail;
 434        pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
 435        pr_debug("  TX: %d, PCR %d..%d, SDU %d\n",
 436                 vcc->qos.txtp.traffic_class,
 437                 vcc->qos.txtp.min_pcr,
 438                 vcc->qos.txtp.max_pcr,
 439                 vcc->qos.txtp.max_sdu);
 440        pr_debug("  RX: %d, PCR %d..%d, SDU %d\n",
 441                 vcc->qos.rxtp.traffic_class,
 442                 vcc->qos.rxtp.min_pcr,
 443                 vcc->qos.rxtp.max_pcr,
 444                 vcc->qos.rxtp.max_sdu);
 445
 446        if (dev->ops->open) {
 447                error = dev->ops->open(vcc);
 448                if (error)
 449                        goto fail;
 450        }
 451        return 0;
 452
 453fail:
 454        vcc_remove_socket(sk);
 455fail_module_put:
 456        module_put(dev->ops->owner);
 457        /* ensure we get dev module ref count correct */
 458        vcc->dev = NULL;
 459        return error;
 460}
 461
 462int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
 463{
 464        struct atm_dev *dev;
 465        struct atm_vcc *vcc = ATM_SD(sock);
 466        int error;
 467
 468        pr_debug("(vpi %d, vci %d)\n", vpi, vci);
 469        if (sock->state == SS_CONNECTED)
 470                return -EISCONN;
 471        if (sock->state != SS_UNCONNECTED)
 472                return -EINVAL;
 473        if (!(vpi || vci))
 474                return -EINVAL;
 475
 476        if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
 477                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 478        else
 479                if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
 480                        return -EINVAL;
 481        pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
 482                 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
 483                 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
 484                 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
 485                 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
 486                 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
 487                 vcc->qos.aal == ATM_AAL5 ? "" :
 488                 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
 489                 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
 490        if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
 491                return -EBADFD;
 492        if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
 493            vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
 494                return -EINVAL;
 495        if (likely(itf != ATM_ITF_ANY)) {
 496                dev = try_then_request_module(atm_dev_lookup(itf),
 497                                              "atm-device-%d", itf);
 498        } else {
 499                dev = NULL;
 500                mutex_lock(&atm_dev_mutex);
 501                if (!list_empty(&atm_devs)) {
 502                        dev = list_entry(atm_devs.next,
 503                                         struct atm_dev, dev_list);
 504                        atm_dev_hold(dev);
 505                }
 506                mutex_unlock(&atm_dev_mutex);
 507        }
 508        if (!dev)
 509                return -ENODEV;
 510        error = __vcc_connect(vcc, dev, vpi, vci);
 511        if (error) {
 512                atm_dev_put(dev);
 513                return error;
 514        }
 515        if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
 516                set_bit(ATM_VF_PARTIAL, &vcc->flags);
 517        if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
 518                sock->state = SS_CONNECTED;
 519        return 0;
 520}
 521
 522int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 523                int flags)
 524{
 525        struct sock *sk = sock->sk;
 526        struct atm_vcc *vcc;
 527        struct sk_buff *skb;
 528        int copied, error = -EINVAL;
 529
 530        if (sock->state != SS_CONNECTED)
 531                return -ENOTCONN;
 532
 533        /* only handle MSG_DONTWAIT and MSG_PEEK */
 534        if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
 535                return -EOPNOTSUPP;
 536
 537        vcc = ATM_SD(sock);
 538        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 539            test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 540            !test_bit(ATM_VF_READY, &vcc->flags))
 541                return 0;
 542
 543        skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
 544        if (!skb)
 545                return error;
 546
 547        copied = skb->len;
 548        if (copied > size) {
 549                copied = size;
 550                msg->msg_flags |= MSG_TRUNC;
 551        }
 552
 553        error = skb_copy_datagram_msg(skb, 0, msg, copied);
 554        if (error)
 555                return error;
 556        sock_recv_ts_and_drops(msg, sk, skb);
 557
 558        if (!(flags & MSG_PEEK)) {
 559                pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
 560                         skb->truesize);
 561                atm_return(vcc, skb->truesize);
 562        }
 563
 564        skb_free_datagram(sk, skb);
 565        return copied;
 566}
 567
 568int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
 569{
 570        struct sock *sk = sock->sk;
 571        DEFINE_WAIT(wait);
 572        struct atm_vcc *vcc;
 573        struct sk_buff *skb;
 574        int eff, error;
 575
 576        lock_sock(sk);
 577        if (sock->state != SS_CONNECTED) {
 578                error = -ENOTCONN;
 579                goto out;
 580        }
 581        if (m->msg_name) {
 582                error = -EISCONN;
 583                goto out;
 584        }
 585        vcc = ATM_SD(sock);
 586        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 587            test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 588            !test_bit(ATM_VF_READY, &vcc->flags)) {
 589                error = -EPIPE;
 590                send_sig(SIGPIPE, current, 0);
 591                goto out;
 592        }
 593        if (!size) {
 594                error = 0;
 595                goto out;
 596        }
 597        if (size > vcc->qos.txtp.max_sdu) {
 598                error = -EMSGSIZE;
 599                goto out;
 600        }
 601
 602        eff = (size+3) & ~3; /* align to word boundary */
 603        prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 604        error = 0;
 605        while (!vcc_tx_ready(vcc, eff)) {
 606                if (m->msg_flags & MSG_DONTWAIT) {
 607                        error = -EAGAIN;
 608                        break;
 609                }
 610                schedule();
 611                if (signal_pending(current)) {
 612                        error = -ERESTARTSYS;
 613                        break;
 614                }
 615                if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 616                    test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 617                    !test_bit(ATM_VF_READY, &vcc->flags)) {
 618                        error = -EPIPE;
 619                        send_sig(SIGPIPE, current, 0);
 620                        break;
 621                }
 622                prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 623        }
 624        finish_wait(sk_sleep(sk), &wait);
 625        if (error)
 626                goto out;
 627
 628        skb = alloc_skb(eff, GFP_KERNEL);
 629        if (!skb) {
 630                error = -ENOMEM;
 631                goto out;
 632        }
 633        pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
 634        atm_account_tx(vcc, skb);
 635
 636        skb->dev = NULL; /* for paths shared with net_device interfaces */
 637        if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) {
 638                kfree_skb(skb);
 639                error = -EFAULT;
 640                goto out;
 641        }
 642        if (eff != size)
 643                memset(skb->data + size, 0, eff-size);
 644        error = vcc->dev->ops->send(vcc, skb);
 645        error = error ? error : size;
 646out:
 647        release_sock(sk);
 648        return error;
 649}
 650
 651__poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
 652{
 653        struct sock *sk = sock->sk;
 654        struct atm_vcc *vcc;
 655        __poll_t mask;
 656
 657        sock_poll_wait(file, sock, wait);
 658        mask = 0;
 659
 660        vcc = ATM_SD(sock);
 661
 662        /* exceptional events */
 663        if (sk->sk_err)
 664                mask = EPOLLERR;
 665
 666        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 667            test_bit(ATM_VF_CLOSE, &vcc->flags))
 668                mask |= EPOLLHUP;
 669
 670        /* readable? */
 671        if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
 672                mask |= EPOLLIN | EPOLLRDNORM;
 673
 674        /* writable? */
 675        if (sock->state == SS_CONNECTING &&
 676            test_bit(ATM_VF_WAITING, &vcc->flags))
 677                return mask;
 678
 679        if (vcc->qos.txtp.traffic_class != ATM_NONE &&
 680            vcc_writable(sk))
 681                mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
 682
 683        return mask;
 684}
 685
 686static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
 687{
 688        int error;
 689
 690        /*
 691         * Don't let the QoS change the already connected AAL type nor the
 692         * traffic class.
 693         */
 694        if (qos->aal != vcc->qos.aal ||
 695            qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
 696            qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
 697                return -EINVAL;
 698        error = adjust_tp(&qos->txtp, qos->aal);
 699        if (!error)
 700                error = adjust_tp(&qos->rxtp, qos->aal);
 701        if (error)
 702                return error;
 703        if (!vcc->dev->ops->change_qos)
 704                return -EOPNOTSUPP;
 705        if (sk_atm(vcc)->sk_family == AF_ATMPVC)
 706                return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
 707        return svc_change_qos(vcc, qos);
 708}
 709
 710static int check_tp(const struct atm_trafprm *tp)
 711{
 712        /* @@@ Should be merged with adjust_tp */
 713        if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
 714                return 0;
 715        if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
 716            !tp->max_pcr)
 717                return -EINVAL;
 718        if (tp->min_pcr == ATM_MAX_PCR)
 719                return -EINVAL;
 720        if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
 721            tp->min_pcr > tp->max_pcr)
 722                return -EINVAL;
 723        /*
 724         * We allow pcr to be outside [min_pcr,max_pcr], because later
 725         * adjustment may still push it in the valid range.
 726         */
 727        return 0;
 728}
 729
 730static int check_qos(const struct atm_qos *qos)
 731{
 732        int error;
 733
 734        if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
 735                return -EINVAL;
 736        if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
 737            qos->txtp.traffic_class && qos->rxtp.traffic_class &&
 738            qos->txtp.traffic_class != ATM_ANYCLASS &&
 739            qos->rxtp.traffic_class != ATM_ANYCLASS)
 740                return -EINVAL;
 741        error = check_tp(&qos->txtp);
 742        if (error)
 743                return error;
 744        return check_tp(&qos->rxtp);
 745}
 746
 747int vcc_setsockopt(struct socket *sock, int level, int optname,
 748                   char __user *optval, unsigned int optlen)
 749{
 750        struct atm_vcc *vcc;
 751        unsigned long value;
 752        int error;
 753
 754        if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
 755                return -EINVAL;
 756
 757        vcc = ATM_SD(sock);
 758        switch (optname) {
 759        case SO_ATMQOS:
 760        {
 761                struct atm_qos qos;
 762
 763                if (copy_from_user(&qos, optval, sizeof(qos)))
 764                        return -EFAULT;
 765                error = check_qos(&qos);
 766                if (error)
 767                        return error;
 768                if (sock->state == SS_CONNECTED)
 769                        return atm_change_qos(vcc, &qos);
 770                if (sock->state != SS_UNCONNECTED)
 771                        return -EBADFD;
 772                vcc->qos = qos;
 773                set_bit(ATM_VF_HASQOS, &vcc->flags);
 774                return 0;
 775        }
 776        case SO_SETCLP:
 777                if (get_user(value, (unsigned long __user *)optval))
 778                        return -EFAULT;
 779                if (value)
 780                        vcc->atm_options |= ATM_ATMOPT_CLP;
 781                else
 782                        vcc->atm_options &= ~ATM_ATMOPT_CLP;
 783                return 0;
 784        default:
 785                if (level == SOL_SOCKET)
 786                        return -EINVAL;
 787                break;
 788        }
 789        if (!vcc->dev || !vcc->dev->ops->setsockopt)
 790                return -EINVAL;
 791        return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
 792}
 793
 794int vcc_getsockopt(struct socket *sock, int level, int optname,
 795                   char __user *optval, int __user *optlen)
 796{
 797        struct atm_vcc *vcc;
 798        int len;
 799
 800        if (get_user(len, optlen))
 801                return -EFAULT;
 802        if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
 803                return -EINVAL;
 804
 805        vcc = ATM_SD(sock);
 806        switch (optname) {
 807        case SO_ATMQOS:
 808                if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
 809                        return -EINVAL;
 810                return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
 811                        ? -EFAULT : 0;
 812        case SO_SETCLP:
 813                return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
 814                                (unsigned long __user *)optval) ? -EFAULT : 0;
 815        case SO_ATMPVC:
 816        {
 817                struct sockaddr_atmpvc pvc;
 818
 819                if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
 820                        return -ENOTCONN;
 821                memset(&pvc, 0, sizeof(pvc));
 822                pvc.sap_family = AF_ATMPVC;
 823                pvc.sap_addr.itf = vcc->dev->number;
 824                pvc.sap_addr.vpi = vcc->vpi;
 825                pvc.sap_addr.vci = vcc->vci;
 826                return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
 827        }
 828        default:
 829                if (level == SOL_SOCKET)
 830                        return -EINVAL;
 831                break;
 832        }
 833        if (!vcc->dev || !vcc->dev->ops->getsockopt)
 834                return -EINVAL;
 835        return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
 836}
 837
 838int register_atmdevice_notifier(struct notifier_block *nb)
 839{
 840        return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
 841}
 842EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
 843
 844void unregister_atmdevice_notifier(struct notifier_block *nb)
 845{
 846        atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
 847}
 848EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
 849
 850static int __init atm_init(void)
 851{
 852        int error;
 853
 854        error = proto_register(&vcc_proto, 0);
 855        if (error < 0)
 856                goto out;
 857        error = atmpvc_init();
 858        if (error < 0) {
 859                pr_err("atmpvc_init() failed with %d\n", error);
 860                goto out_unregister_vcc_proto;
 861        }
 862        error = atmsvc_init();
 863        if (error < 0) {
 864                pr_err("atmsvc_init() failed with %d\n", error);
 865                goto out_atmpvc_exit;
 866        }
 867        error = atm_proc_init();
 868        if (error < 0) {
 869                pr_err("atm_proc_init() failed with %d\n", error);
 870                goto out_atmsvc_exit;
 871        }
 872        error = atm_sysfs_init();
 873        if (error < 0) {
 874                pr_err("atm_sysfs_init() failed with %d\n", error);
 875                goto out_atmproc_exit;
 876        }
 877out:
 878        return error;
 879out_atmproc_exit:
 880        atm_proc_exit();
 881out_atmsvc_exit:
 882        atmsvc_exit();
 883out_atmpvc_exit:
 884        atmsvc_exit();
 885out_unregister_vcc_proto:
 886        proto_unregister(&vcc_proto);
 887        goto out;
 888}
 889
 890static void __exit atm_exit(void)
 891{
 892        atm_proc_exit();
 893        atm_sysfs_exit();
 894        atmsvc_exit();
 895        atmpvc_exit();
 896        proto_unregister(&vcc_proto);
 897}
 898
 899subsys_initcall(atm_init);
 900
 901module_exit(atm_exit);
 902
 903MODULE_LICENSE("GPL");
 904MODULE_ALIAS_NETPROTO(PF_ATMPVC);
 905MODULE_ALIAS_NETPROTO(PF_ATMSVC);
 906