net/atm/common.c

   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
  34 struct hlist_head vcc_hash[VCC_HTABLE_SIZE];
  35 EXPORT_SYMBOL(vcc_hash);
  36
  37 DEFINE_RWLOCK(vcc_sklist_lock);
  38 EXPORT_SYMBOL(vcc_sklist_lock);
  39
  40 static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);
  41
  42 static 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
  50 void 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 }
  56 EXPORT_SYMBOL(vcc_insert_socket);
  57
  58 static 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
  65 static 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
  82 static 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
  93 static 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
 104 static 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
 112 static 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
 129 static struct proto vcc_proto = {
 130         .name     = "VCC",
 131         .owner    = THIS_MODULE,
 132         .obj_size = sizeof(struct atm_vcc),
 133 };
 134
 135 int 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
 166 static 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
 191 int 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
 205 void 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 }
 215 EXPORT_SYMBOL(vcc_release_async);
 216
 217 void 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 }
 235 EXPORT_SYMBOL(vcc_process_recv_queue);
 236
 237 void 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 }
 252 EXPORT_SYMBOL(atm_dev_signal_change);
 253
 254 void 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 }
 275 EXPORT_SYMBOL(atm_dev_release_vccs);
 276
 277 static 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
 305 static 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
 331 static 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
 375 static 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
 446 fail:
 447         vcc_remove_socket(sk);
 448 fail_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
 455 int 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
 515 int 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
 561 int 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;
 640 out:
 641         release_sock(sk);
 642         return error;
 643 }
 644
 645 unsigned 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
 680 static 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
 704 static 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
 724 static 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
 741 int 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
 788 int 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                 pvc.sap_family = AF_ATMPVC;
 816                 pvc.sap_addr.itf = vcc->dev->number;
 817                 pvc.sap_addr.vpi = vcc->vpi;
 818                 pvc.sap_addr.vci = vcc->vci;
 819                 return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0;
 820         }
 821         default:
 822                 if (level == SOL_SOCKET)
 823                         return -EINVAL;
 824                 break;
 825         }
 826         if (!vcc->dev || !vcc->dev->ops->getsockopt)
 827                 return -EINVAL;
 828         return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
 829 }
 830
 831 int register_atmdevice_notifier(struct notifier_block *nb)
 832 {
 833         return atomic_notifier_chain_register(&atm_dev_notify_chain, nb);
 834 }
 835 EXPORT_SYMBOL_GPL(register_atmdevice_notifier);
 836
 837 void unregister_atmdevice_notifier(struct notifier_block *nb)
 838 {
 839         atomic_notifier_chain_unregister(&atm_dev_notify_chain, nb);
 840 }
 841 EXPORT_SYMBOL_GPL(unregister_atmdevice_notifier);
 842
 843 static int __init atm_init(void)
 844 {
 845         int error;
 846
 847         error = proto_register(&vcc_proto, 0);
 848         if (error < 0)
 849                 goto out;
 850         error = atmpvc_init();
 851         if (error < 0) {
 852                 pr_err("atmpvc_init() failed with %d\n", error);
 853                 goto out_unregister_vcc_proto;
 854         }
 855         error = atmsvc_init();
 856         if (error < 0) {
 857                 pr_err("atmsvc_init() failed with %d\n", error);
 858                 goto out_atmpvc_exit;
 859         }
 860         error = atm_proc_init();
 861         if (error < 0) {
 862                 pr_err("atm_proc_init() failed with %d\n", error);
 863                 goto out_atmsvc_exit;
 864         }
 865         error = atm_sysfs_init();
 866         if (error < 0) {
 867                 pr_err("atm_sysfs_init() failed with %d\n", error);
 868                 goto out_atmproc_exit;
 869         }
 870 out:
 871         return error;
 872 out_atmproc_exit:
 873         atm_proc_exit();
 874 out_atmsvc_exit:
 875         atmsvc_exit();
 876 out_atmpvc_exit:
 877         atmsvc_exit();
 878 out_unregister_vcc_proto:
 879         proto_unregister(&vcc_proto);
 880         goto out;
 881 }
 882
 883 static void __exit atm_exit(void)
 884 {
 885         atm_proc_exit();
 886         atm_sysfs_exit();
 887         atmsvc_exit();
 888         atmpvc_exit();
 889         proto_unregister(&vcc_proto);
 890 }
 891
 892 subsys_initcall(atm_init);
 893
 894 module_exit(atm_exit);
 895
 896 MODULE_LICENSE("GPL");
 897 MODULE_ALIAS_NETPROTO(PF_ATMPVC);
 898 MODULE_ALIAS_NETPROTO(PF_ATMSVC);