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/signal.h>
  17#include <linux/time64.h>       /* 64-bit time for seconds */
  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 bool vcc_tx_ready(struct atm_vcc *vcc, unsigned int size)
  66{
  67        struct sock *sk = sk_atm(vcc);
  68
  69        if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) {
  70                pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n",
  71                         sk_wmem_alloc_get(sk), size, sk->sk_sndbuf);
  72                return false;
  73        }
  74        return true;
  75}
  76
  77static void vcc_sock_destruct(struct sock *sk)
  78{
  79        if (atomic_read(&sk->sk_rmem_alloc))
  80                printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n",
  81                       __func__, atomic_read(&sk->sk_rmem_alloc));
  82
  83        if (refcount_read(&sk->sk_wmem_alloc))
  84                printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n",
  85                       __func__, refcount_read(&sk->sk_wmem_alloc));
  86}
  87
  88static void vcc_def_wakeup(struct sock *sk)
  89{
  90        struct socket_wq *wq;
  91
  92        rcu_read_lock();
  93        wq = rcu_dereference(sk->sk_wq);
  94        if (skwq_has_sleeper(wq))
  95                wake_up(&wq->wait);
  96        rcu_read_unlock();
  97}
  98
  99static inline int vcc_writable(struct sock *sk)
 100{
 101        struct atm_vcc *vcc = atm_sk(sk);
 102
 103        return (vcc->qos.txtp.max_sdu +
 104                refcount_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf;
 105}
 106
 107static void vcc_write_space(struct sock *sk)
 108{
 109        struct socket_wq *wq;
 110
 111        rcu_read_lock();
 112
 113        if (vcc_writable(sk)) {
 114                wq = rcu_dereference(sk->sk_wq);
 115                if (skwq_has_sleeper(wq))
 116                        wake_up_interruptible(&wq->wait);
 117
 118                sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 119        }
 120
 121        rcu_read_unlock();
 122}
 123
 124static void vcc_release_cb(struct sock *sk)
 125{
 126        struct atm_vcc *vcc = atm_sk(sk);
 127
 128        if (vcc->release_cb)
 129                vcc->release_cb(vcc);
 130}
 131
 132static struct proto vcc_proto = {
 133        .name     = "VCC",
 134        .owner    = THIS_MODULE,
 135        .obj_size = sizeof(struct atm_vcc),
 136        .release_cb = vcc_release_cb,
 137};
 138
 139int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern)
 140{
 141        struct sock *sk;
 142        struct atm_vcc *vcc;
 143
 144        sock->sk = NULL;
 145        if (sock->type == SOCK_STREAM)
 146                return -EINVAL;
 147        sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern);
 148        if (!sk)
 149                return -ENOMEM;
 150        sock_init_data(sock, sk);
 151        sk->sk_state_change = vcc_def_wakeup;
 152        sk->sk_write_space = vcc_write_space;
 153
 154        vcc = atm_sk(sk);
 155        vcc->dev = NULL;
 156        memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc));
 157        memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc));
 158        vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */
 159        refcount_set(&sk->sk_wmem_alloc, 1);
 160        atomic_set(&sk->sk_rmem_alloc, 0);
 161        vcc->push = NULL;
 162        vcc->pop = NULL;
 163        vcc->owner = NULL;
 164        vcc->push_oam = NULL;
 165        vcc->release_cb = NULL;
 166        vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */
 167        vcc->atm_options = vcc->aal_options = 0;
 168        sk->sk_destruct = vcc_sock_destruct;
 169        return 0;
 170}
 171
 172static void vcc_destroy_socket(struct sock *sk)
 173{
 174        struct atm_vcc *vcc = atm_sk(sk);
 175        struct sk_buff *skb;
 176
 177        set_bit(ATM_VF_CLOSE, &vcc->flags);
 178        clear_bit(ATM_VF_READY, &vcc->flags);
 179        if (vcc->dev) {
 180                if (vcc->dev->ops->close)
 181                        vcc->dev->ops->close(vcc);
 182                if (vcc->push)
 183                        vcc->push(vcc, NULL); /* atmarpd has no push */
 184                module_put(vcc->owner);
 185
 186                while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
 187                        atm_return(vcc, skb->truesize);
 188                        kfree_skb(skb);
 189                }
 190
 191                module_put(vcc->dev->ops->owner);
 192                atm_dev_put(vcc->dev);
 193        }
 194
 195        vcc_remove_socket(sk);
 196}
 197
 198int vcc_release(struct socket *sock)
 199{
 200        struct sock *sk = sock->sk;
 201
 202        if (sk) {
 203                lock_sock(sk);
 204                vcc_destroy_socket(sock->sk);
 205                release_sock(sk);
 206                sock_put(sk);
 207        }
 208
 209        return 0;
 210}
 211
 212void vcc_release_async(struct atm_vcc *vcc, int reply)
 213{
 214        struct sock *sk = sk_atm(vcc);
 215
 216        set_bit(ATM_VF_CLOSE, &vcc->flags);
 217        sk->sk_shutdown |= RCV_SHUTDOWN;
 218        sk->sk_err = -reply;
 219        clear_bit(ATM_VF_WAITING, &vcc->flags);
 220        sk->sk_state_change(sk);
 221}
 222EXPORT_SYMBOL(vcc_release_async);
 223
 224void vcc_process_recv_queue(struct atm_vcc *vcc)
 225{
 226        struct sk_buff_head queue, *rq;
 227        struct sk_buff *skb, *tmp;
 228        unsigned long flags;
 229
 230        __skb_queue_head_init(&queue);
 231        rq = &sk_atm(vcc)->sk_receive_queue;
 232
 233        spin_lock_irqsave(&rq->lock, flags);
 234        skb_queue_splice_init(rq, &queue);
 235        spin_unlock_irqrestore(&rq->lock, flags);
 236
 237        skb_queue_walk_safe(&queue, skb, tmp) {
 238                __skb_unlink(skb, &queue);
 239                vcc->push(vcc, skb);
 240        }
 241}
 242EXPORT_SYMBOL(vcc_process_recv_queue);
 243
 244void atm_dev_signal_change(struct atm_dev *dev, char signal)
 245{
 246        pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n",
 247                __func__, signal, dev, dev->number, dev->signal);
 248
 249        /* atm driver sending invalid signal */
 250        WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND);
 251
 252        if (dev->signal == signal)
 253                return; /* no change */
 254
 255        dev->signal = signal;
 256
 257        atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev);
 258}
 259EXPORT_SYMBOL(atm_dev_signal_change);
 260
 261void atm_dev_release_vccs(struct atm_dev *dev)
 262{
 263        int i;
 264
 265        write_lock_irq(&vcc_sklist_lock);
 266        for (i = 0; i < VCC_HTABLE_SIZE; i++) {
 267                struct hlist_head *head = &vcc_hash[i];
 268                struct hlist_node *tmp;
 269                struct sock *s;
 270                struct atm_vcc *vcc;
 271
 272                sk_for_each_safe(s, tmp, head) {
 273                        vcc = atm_sk(s);
 274                        if (vcc->dev == dev) {
 275                                vcc_release_async(vcc, -EPIPE);
 276                                sk_del_node_init(s);
 277                        }
 278                }
 279        }
 280        write_unlock_irq(&vcc_sklist_lock);
 281}
 282EXPORT_SYMBOL(atm_dev_release_vccs);
 283
 284static int adjust_tp(struct atm_trafprm *tp, unsigned char aal)
 285{
 286        int max_sdu;
 287
 288        if (!tp->traffic_class)
 289                return 0;
 290        switch (aal) {
 291        case ATM_AAL0:
 292                max_sdu = ATM_CELL_SIZE-1;
 293                break;
 294        case ATM_AAL34:
 295                max_sdu = ATM_MAX_AAL34_PDU;
 296                break;
 297        default:
 298                pr_warn("AAL problems ... (%d)\n", aal);
 299                /* fall through */
 300        case ATM_AAL5:
 301                max_sdu = ATM_MAX_AAL5_PDU;
 302        }
 303        if (!tp->max_sdu)
 304                tp->max_sdu = max_sdu;
 305        else if (tp->max_sdu > max_sdu)
 306                return -EINVAL;
 307        if (!tp->max_cdv)
 308                tp->max_cdv = ATM_MAX_CDV;
 309        return 0;
 310}
 311
 312static int check_ci(const struct atm_vcc *vcc, short vpi, int vci)
 313{
 314        struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)];
 315        struct sock *s;
 316        struct atm_vcc *walk;
 317
 318        sk_for_each(s, head) {
 319                walk = atm_sk(s);
 320                if (walk->dev != vcc->dev)
 321                        continue;
 322                if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi &&
 323                    walk->vci == vci && ((walk->qos.txtp.traffic_class !=
 324                    ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) ||
 325                    (walk->qos.rxtp.traffic_class != ATM_NONE &&
 326                    vcc->qos.rxtp.traffic_class != ATM_NONE)))
 327                        return -EADDRINUSE;
 328        }
 329
 330        /* allow VCCs with same VPI/VCI iff they don't collide on
 331           TX/RX (but we may refuse such sharing for other reasons,
 332           e.g. if protocol requires to have both channels) */
 333
 334        return 0;
 335}
 336
 337static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci)
 338{
 339        static short p;        /* poor man's per-device cache */
 340        static int c;
 341        short old_p;
 342        int old_c;
 343        int err;
 344
 345        if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) {
 346                err = check_ci(vcc, *vpi, *vci);
 347                return err;
 348        }
 349        /* last scan may have left values out of bounds for current device */
 350        if (*vpi != ATM_VPI_ANY)
 351                p = *vpi;
 352        else if (p >= 1 << vcc->dev->ci_range.vpi_bits)
 353                p = 0;
 354        if (*vci != ATM_VCI_ANY)
 355                c = *vci;
 356        else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits)
 357                        c = ATM_NOT_RSV_VCI;
 358        old_p = p;
 359        old_c = c;
 360        do {
 361                if (!check_ci(vcc, p, c)) {
 362                        *vpi = p;
 363                        *vci = c;
 364                        return 0;
 365                }
 366                if (*vci == ATM_VCI_ANY) {
 367                        c++;
 368                        if (c >= 1 << vcc->dev->ci_range.vci_bits)
 369                                c = ATM_NOT_RSV_VCI;
 370                }
 371                if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) &&
 372                    *vpi == ATM_VPI_ANY) {
 373                        p++;
 374                        if (p >= 1 << vcc->dev->ci_range.vpi_bits)
 375                                p = 0;
 376                }
 377        } while (old_p != p || old_c != c);
 378        return -EADDRINUSE;
 379}
 380
 381static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi,
 382                         int vci)
 383{
 384        struct sock *sk = sk_atm(vcc);
 385        int error;
 386
 387        if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY &&
 388            vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC &&
 389            vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits))
 390                return -EINVAL;
 391        if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE))
 392                return -EPERM;
 393        error = -ENODEV;
 394        if (!try_module_get(dev->ops->owner))
 395                return error;
 396        vcc->dev = dev;
 397        write_lock_irq(&vcc_sklist_lock);
 398        if (test_bit(ATM_DF_REMOVED, &dev->flags) ||
 399            (error = find_ci(vcc, &vpi, &vci))) {
 400                write_unlock_irq(&vcc_sklist_lock);
 401                goto fail_module_put;
 402        }
 403        vcc->vpi = vpi;
 404        vcc->vci = vci;
 405        __vcc_insert_socket(sk);
 406        write_unlock_irq(&vcc_sklist_lock);
 407        switch (vcc->qos.aal) {
 408        case ATM_AAL0:
 409                error = atm_init_aal0(vcc);
 410                vcc->stats = &dev->stats.aal0;
 411                break;
 412        case ATM_AAL34:
 413                error = atm_init_aal34(vcc);
 414                vcc->stats = &dev->stats.aal34;
 415                break;
 416        case ATM_NO_AAL:
 417                /* ATM_AAL5 is also used in the "0 for default" case */
 418                vcc->qos.aal = ATM_AAL5;
 419                /* fall through */
 420        case ATM_AAL5:
 421                error = atm_init_aal5(vcc);
 422                vcc->stats = &dev->stats.aal5;
 423                break;
 424        default:
 425                error = -EPROTOTYPE;
 426        }
 427        if (!error)
 428                error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal);
 429        if (!error)
 430                error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal);
 431        if (error)
 432                goto fail;
 433        pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal);
 434        pr_debug("  TX: %d, PCR %d..%d, SDU %d\n",
 435                 vcc->qos.txtp.traffic_class,
 436                 vcc->qos.txtp.min_pcr,
 437                 vcc->qos.txtp.max_pcr,
 438                 vcc->qos.txtp.max_sdu);
 439        pr_debug("  RX: %d, PCR %d..%d, SDU %d\n",
 440                 vcc->qos.rxtp.traffic_class,
 441                 vcc->qos.rxtp.min_pcr,
 442                 vcc->qos.rxtp.max_pcr,
 443                 vcc->qos.rxtp.max_sdu);
 444
 445        if (dev->ops->open) {
 446                error = dev->ops->open(vcc);
 447                if (error)
 448                        goto fail;
 449        }
 450        return 0;
 451
 452fail:
 453        vcc_remove_socket(sk);
 454fail_module_put:
 455        module_put(dev->ops->owner);
 456        /* ensure we get dev module ref count correct */
 457        vcc->dev = NULL;
 458        return error;
 459}
 460
 461int vcc_connect(struct socket *sock, int itf, short vpi, int vci)
 462{
 463        struct atm_dev *dev;
 464        struct atm_vcc *vcc = ATM_SD(sock);
 465        int error;
 466
 467        pr_debug("(vpi %d, vci %d)\n", vpi, vci);
 468        if (sock->state == SS_CONNECTED)
 469                return -EISCONN;
 470        if (sock->state != SS_UNCONNECTED)
 471                return -EINVAL;
 472        if (!(vpi || vci))
 473                return -EINVAL;
 474
 475        if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC)
 476                clear_bit(ATM_VF_PARTIAL, &vcc->flags);
 477        else
 478                if (test_bit(ATM_VF_PARTIAL, &vcc->flags))
 479                        return -EINVAL;
 480        pr_debug("(TX: cl %d,bw %d-%d,sdu %d; "
 481                 "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n",
 482                 vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr,
 483                 vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu,
 484                 vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr,
 485                 vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu,
 486                 vcc->qos.aal == ATM_AAL5 ? "" :
 487                 vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ",
 488                 vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal);
 489        if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
 490                return -EBADFD;
 491        if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
 492            vcc->qos.rxtp.traffic_class == ATM_ANYCLASS)
 493                return -EINVAL;
 494        if (likely(itf != ATM_ITF_ANY)) {
 495                dev = try_then_request_module(atm_dev_lookup(itf),
 496                                              "atm-device-%d", itf);
 497        } else {
 498                dev = NULL;
 499                mutex_lock(&atm_dev_mutex);
 500                if (!list_empty(&atm_devs)) {
 501                        dev = list_entry(atm_devs.next,
 502                                         struct atm_dev, dev_list);
 503                        atm_dev_hold(dev);
 504                }
 505                mutex_unlock(&atm_dev_mutex);
 506        }
 507        if (!dev)
 508                return -ENODEV;
 509        error = __vcc_connect(vcc, dev, vpi, vci);
 510        if (error) {
 511                atm_dev_put(dev);
 512                return error;
 513        }
 514        if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC)
 515                set_bit(ATM_VF_PARTIAL, &vcc->flags);
 516        if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags))
 517                sock->state = SS_CONNECTED;
 518        return 0;
 519}
 520
 521int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
 522                int flags)
 523{
 524        struct sock *sk = sock->sk;
 525        struct atm_vcc *vcc;
 526        struct sk_buff *skb;
 527        int copied, error = -EINVAL;
 528
 529        if (sock->state != SS_CONNECTED)
 530                return -ENOTCONN;
 531
 532        /* only handle MSG_DONTWAIT and MSG_PEEK */
 533        if (flags & ~(MSG_DONTWAIT | MSG_PEEK))
 534                return -EOPNOTSUPP;
 535
 536        vcc = ATM_SD(sock);
 537        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 538            test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 539            !test_bit(ATM_VF_READY, &vcc->flags))
 540                return 0;
 541
 542        skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
 543        if (!skb)
 544                return error;
 545
 546        copied = skb->len;
 547        if (copied > size) {
 548                copied = size;
 549                msg->msg_flags |= MSG_TRUNC;
 550        }
 551
 552        error = skb_copy_datagram_msg(skb, 0, msg, copied);
 553        if (error)
 554                return error;
 555        sock_recv_ts_and_drops(msg, sk, skb);
 556
 557        if (!(flags & MSG_PEEK)) {
 558                pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc),
 559                         skb->truesize);
 560                atm_return(vcc, skb->truesize);
 561        }
 562
 563        skb_free_datagram(sk, skb);
 564        return copied;
 565}
 566
 567int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size)
 568{
 569        struct sock *sk = sock->sk;
 570        DEFINE_WAIT(wait);
 571        struct atm_vcc *vcc;
 572        struct sk_buff *skb;
 573        int eff, error;
 574
 575        lock_sock(sk);
 576        if (sock->state != SS_CONNECTED) {
 577                error = -ENOTCONN;
 578                goto out;
 579        }
 580        if (m->msg_name) {
 581                error = -EISCONN;
 582                goto out;
 583        }
 584        vcc = ATM_SD(sock);
 585        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 586            test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 587            !test_bit(ATM_VF_READY, &vcc->flags)) {
 588                error = -EPIPE;
 589                send_sig(SIGPIPE, current, 0);
 590                goto out;
 591        }
 592        if (!size) {
 593                error = 0;
 594                goto out;
 595        }
 596        if (size > vcc->qos.txtp.max_sdu) {
 597                error = -EMSGSIZE;
 598                goto out;
 599        }
 600
 601        eff = (size+3) & ~3; /* align to word boundary */
 602        prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 603        error = 0;
 604        while (!vcc_tx_ready(vcc, eff)) {
 605                if (m->msg_flags & MSG_DONTWAIT) {
 606                        error = -EAGAIN;
 607                        break;
 608                }
 609                schedule();
 610                if (signal_pending(current)) {
 611                        error = -ERESTARTSYS;
 612                        break;
 613                }
 614                if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 615                    test_bit(ATM_VF_CLOSE, &vcc->flags) ||
 616                    !test_bit(ATM_VF_READY, &vcc->flags)) {
 617                        error = -EPIPE;
 618                        send_sig(SIGPIPE, current, 0);
 619                        break;
 620                }
 621                prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 622        }
 623        finish_wait(sk_sleep(sk), &wait);
 624        if (error)
 625                goto out;
 626
 627        skb = alloc_skb(eff, GFP_KERNEL);
 628        if (!skb) {
 629                error = -ENOMEM;
 630                goto out;
 631        }
 632        pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
 633        atm_account_tx(vcc, skb);
 634
 635        skb->dev = NULL; /* for paths shared with net_device interfaces */
 636        if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) {
 637                kfree_skb(skb);
 638                error = -EFAULT;
 639                goto out;
 640        }
 641        if (eff != size)
 642                memset(skb->data + size, 0, eff-size);
 643        error = vcc->dev->ops->send(vcc, skb);
 644        error = error ? error : size;
 645out:
 646        release_sock(sk);
 647        return error;
 648}
 649
 650__poll_t vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
 651{
 652        struct sock *sk = sock->sk;
 653        struct atm_vcc *vcc;
 654        __poll_t mask;
 655
 656        sock_poll_wait(file, sock, wait);
 657        mask = 0;
 658
 659        vcc = ATM_SD(sock);
 660
 661        /* exceptional events */
 662        if (sk->sk_err)
 663                mask = EPOLLERR;
 664
 665        if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
 666            test_bit(ATM_VF_CLOSE, &vcc->flags))
 667                mask |= EPOLLHUP;
 668
 669        /* readable? */
 670        if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
 671                mask |= EPOLLIN | EPOLLRDNORM;
 672
 673        /* writable? */
 674        if (sock->state == SS_CONNECTING &&
 675            test_bit(ATM_VF_WAITING, &vcc->flags))
 676                return mask;
 677
 678        if (vcc->qos.txtp.traffic_class != ATM_NONE &&
 679            vcc_writable(sk))
 680                mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND;
 681
 682        return mask;
 683}
 684
 685static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
 686{
 687        int error;
 688
 689        /*
 690         * Don't let the QoS change the already connected AAL type nor the
 691         * traffic class.
 692         */
 693        if (qos->aal != vcc->qos.aal ||
 694            qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
 695            qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
 696                return -EINVAL;
 697        error = adjust_tp(&qos->txtp, qos->aal);
 698        if (!error)
 699                error = adjust_tp(&qos->rxtp, qos->aal);
 700        if (error)
 701                return error;
 702        if (!vcc->dev->ops->change_qos)
 703                return -EOPNOTSUPP;
 704        if (sk_atm(vcc)->sk_family == AF_ATMPVC)
 705                return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET);
 706        return svc_change_qos(vcc, qos);
 707}
 708
 709static int check_tp(const struct atm_trafprm *tp)
 710{
 711        /* @@@ Should be merged with adjust_tp */
 712        if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS)
 713                return 0;
 714        if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
 715            !tp->max_pcr)
 716                return -EINVAL;
 717        if (tp->min_pcr == ATM_MAX_PCR)
 718                return -EINVAL;
 719        if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
 720            tp->min_pcr > tp->max_pcr)
 721                return -EINVAL;
 722        /*
 723         * We allow pcr to be outside [min_pcr,max_pcr], because later
 724         * adjustment may still push it in the valid range.
 725         */
 726        return 0;
 727}
 728
 729static int check_qos(const struct atm_qos *qos)
 730{
 731        int error;
 732
 733        if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
 734                return -EINVAL;
 735        if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
 736            qos->txtp.traffic_class && qos->rxtp.traffic_class &&
 737            qos->txtp.traffic_class != ATM_ANYCLASS &&
 738            qos->rxtp.traffic_class != ATM_ANYCLASS)
 739                return -EINVAL;
 740        error = check_tp(&qos->txtp);
 741        if (error)
 742                return error;
 743        return check_tp(&qos->rxtp);
 744}
 745
 746int vcc_setsockopt(struct socket *sock, int level, int optname,
 747                   char __user *optval, unsigned int optlen)
 748{
 749        struct atm_vcc *vcc;
 750        unsigned long value;
 751        int error;
 752
 753        if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
 754                return -EINVAL;
 755
 756        vcc = ATM_SD(sock);
 757        switch (optname) {
 758        case SO_ATMQOS:
 759        {
 760                struct atm_qos qos;
 761
 762                if (copy_from_user(&qos, optval, sizeof(qos)))
 763                        return -EFAULT;
 764                error = check_qos(&qos);
 765                if (error)
 766                        return error;
 767                if (sock->state == SS_CONNECTED)
 768                        return atm_change_qos(vcc, &qos);
 769                if (sock->state != SS_UNCONNECTED)
 770                        return -EBADFD;
 771                vcc->qos = qos;
 772                set_bit(ATM_VF_HASQOS, &vcc->flags);
 773                return 0;
 774        }
 775        case SO_SETCLP:
 776                if (get_user(value, (unsigned long __user *)optval))
 777                        return -EFAULT;
 778                if (value)
 779                        vcc->atm_options |= ATM_ATMOPT_CLP;
 780                else
 781                        vcc->atm_options &= ~ATM_ATMOPT_CLP;
 782                return 0;
 783        default:
 784                if (level == SOL_SOCKET)
 785                        return -EINVAL;
 786                break;
 787        }
 788        if (!vcc->dev || !vcc->dev->ops->setsockopt)
 789                return -EINVAL;
 790        return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen);
 791}
 792
 793int vcc_getsockopt(struct socket *sock, int level, int optname,
 794                   char __user *optval, int __user *optlen)
 795{
 796        struct atm_vcc *vcc;
 797        int len;
 798
 799        if (get_user(len, optlen))
 800                return -EFAULT;
 801        if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
 802                return -EINVAL;
 803
 804        vcc = ATM_SD(sock);
 805        switch (optname) {
 806        case SO_ATMQOS:
 807                if (!test_bit(ATM_VF_HASQOS, &vcc->flags))
 808                        return -EINVAL;
 809                return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos))
 810                        ? -EFAULT : 0;
 811        case SO_SETCLP:
 812                return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0,
 813                                (unsigned long __user *)optval) ? -EFAULT : 0;
 814        case SO_ATMPVC:
 815        {
 816                struct sockaddr_atmpvc pvc;
 817
 818                if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags))
 819                        return -ENOTCONN;
 820                memset(&pvc, 0, sizeof(pvc));
 821                pvc.sap_family = AF_ATMPVC;
 822                pvc.sap_addr.itf = vcc->dev->number;
 823                pvc.sap_addr.vpi = vcc->vpi;
 824                pvc.sap_addr.vci = vcc->vci;
 825                return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
 826        }
 827        default:
 828                if (level == SOL_SOCKET)
 829                        return -EINVAL;
 830                break;
 831        }
 832        if (!vcc->dev || !vcc->dev->ops->getsockopt)
 833                return -EINVAL;
 834        return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
 835}
 836
 837int register_atmdevice_notifier(struct notifier_block *nb)
 838{
 839        return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
 840}
 841EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
 842
 843void unregister_atmdevice_notifier(struct notifier_block *nb)
 844{
 845        atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
 846}
 847EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
 848
 849static int __init atm_init(void)
 850{
 851        int error;
 852
 853        error = proto_register(&vcc_proto, 0);
 854        if (error < 0)
 855                goto out;
 856        error = atmpvc_init();
 857        if (error < 0) {
 858                pr_err("atmpvc_init() failed with %d\n", error);
 859                goto out_unregister_vcc_proto;
 860        }
 861        error = atmsvc_init();
 862        if (error < 0) {
 863                pr_err("atmsvc_init() failed with %d\n", error);
 864                goto out_atmpvc_exit;
 865        }
 866        error = atm_proc_init();
 867        if (error < 0) {
 868                pr_err("atm_proc_init() failed with %d\n", error);
 869                goto out_atmsvc_exit;
 870        }
 871        error = atm_sysfs_init();
 872        if (error < 0) {
 873                pr_err("atm_sysfs_init() failed with %d\n", error);
 874                goto out_atmproc_exit;
 875        }
 876out:
 877        return error;
 878out_atmproc_exit:
 879        atm_proc_exit();
 880out_atmsvc_exit:
 881        atmsvc_exit();
 882out_atmpvc_exit:
 883        atmsvc_exit();
 884out_unregister_vcc_proto:
 885        proto_unregister(&vcc_proto);
 886        goto out;
 887}
 888
 889static void __exit atm_exit(void)
 890{
 891        atm_proc_exit();
 892        atm_sysfs_exit();
 893        atmsvc_exit();
 894        atmpvc_exit();
 895        proto_unregister(&vcc_proto);
 896}
 897
 898subsys_initcall(atm_init);
 899
 900module_exit(atm_exit);
 901
 902MODULE_LICENSE("GPL");
 903MODULE_ALIAS_NETPROTO(PF_ATMPVC);
 904MODULE_ALIAS_NETPROTO(PF_ATMSVC);
 905