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