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