net/atm/svc.c

   1 /* net/atm/svc.c - ATM SVC sockets */
   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/string.h>
   8 #include <linux/net.h>          /* struct socket, struct proto_ops */
   9 #include <linux/errno.h>        /* error codes */
  10 #include <linux/kernel.h>       /* printk */
  11 #include <linux/skbuff.h>
  12 #include <linux/wait.h>
  13 #include <linux/sched.h>        /* jiffies and HZ */
  14 #include <linux/fcntl.h>        /* O_NONBLOCK */
  15 #include <linux/init.h>
  16 #include <linux/atm.h>          /* ATM stuff */
  17 #include <linux/atmsap.h>
  18 #include <linux/atmsvc.h>
  19 #include <linux/atmdev.h>
  20 #include <linux/bitops.h>
  21 #include <net/sock.h>           /* for sock_no_* */
  22 #include <linux/uaccess.h>
  23 #include <linux/export.h>
  24
  25 #include "resources.h"
  26 #include "common.h"             /* common for PVCs and SVCs */
  27 #include "signaling.h"
  28 #include "addr.h"
  29
  30 static int svc_create(struct net *net, struct socket *sock, int protocol,
  31                       int kern);
  32
  33 /*
  34  * Note: since all this is still nicely synchronized with the signaling demon,
  35  *       there's no need to protect sleep loops with clis. If signaling is
  36  *       moved into the kernel, that would change.
  37  */
  38
  39
  40 static int svc_shutdown(struct socket *sock, int how)
  41 {
  42         return 0;
  43 }
  44
  45 static void svc_disconnect(struct atm_vcc *vcc)
  46 {
  47         DEFINE_WAIT(wait);
  48         struct sk_buff *skb;
  49         struct sock *sk = sk_atm(vcc);
  50
  51         pr_debug("%p\n", vcc);
  52         if (test_bit(ATM_VF_REGIS, &vcc->flags)) {
  53                 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
  54                 sigd_enq(vcc, as_close, NULL, NULL, NULL);
  55                 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
  56                         schedule();
  57                         prepare_to_wait(sk_sleep(sk), &wait,
  58                                         TASK_UNINTERRUPTIBLE);
  59                 }
  60                 finish_wait(sk_sleep(sk), &wait);
  61         }
  62         /* beware - socket is still in use by atmsigd until the last
  63            as_indicate has been answered */
  64         while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
  65                 atm_return(vcc, skb->truesize);
  66                 pr_debug("LISTEN REL\n");
  67                 sigd_enq2(NULL, as_reject, vcc, NULL, NULL, &vcc->qos, 0);
  68                 dev_kfree_skb(skb);
  69         }
  70         clear_bit(ATM_VF_REGIS, &vcc->flags);
  71         /* ... may retry later */
  72 }
  73
  74 static int svc_release(struct socket *sock)
  75 {
  76         struct sock *sk = sock->sk;
  77         struct atm_vcc *vcc;
  78
  79         if (sk) {
  80                 vcc = ATM_SD(sock);
  81                 pr_debug("%p\n", vcc);
  82                 clear_bit(ATM_VF_READY, &vcc->flags);
  83                 /*
  84                  * VCC pointer is used as a reference,
  85                  * so we must not free it (thereby subjecting it to re-use)
  86                  * before all pending connections are closed
  87                  */
  88                 svc_disconnect(vcc);
  89                 vcc_release(sock);
  90         }
  91         return 0;
  92 }
  93
  94 static int svc_bind(struct socket *sock, struct sockaddr *sockaddr,
  95                     int sockaddr_len)
  96 {
  97         DEFINE_WAIT(wait);
  98         struct sock *sk = sock->sk;
  99         struct sockaddr_atmsvc *addr;
 100         struct atm_vcc *vcc;
 101         int error;
 102
 103         if (sockaddr_len != sizeof(struct sockaddr_atmsvc))
 104                 return -EINVAL;
 105         lock_sock(sk);
 106         if (sock->state == SS_CONNECTED) {
 107                 error = -EISCONN;
 108                 goto out;
 109         }
 110         if (sock->state != SS_UNCONNECTED) {
 111                 error = -EINVAL;
 112                 goto out;
 113         }
 114         vcc = ATM_SD(sock);
 115         addr = (struct sockaddr_atmsvc *) sockaddr;
 116         if (addr->sas_family != AF_ATMSVC) {
 117                 error = -EAFNOSUPPORT;
 118                 goto out;
 119         }
 120         clear_bit(ATM_VF_BOUND, &vcc->flags);
 121             /* failing rebind will kill old binding */
 122         /* @@@ check memory (de)allocation on rebind */
 123         if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
 124                 error = -EBADFD;
 125                 goto out;
 126         }
 127         vcc->local = *addr;
 128         set_bit(ATM_VF_WAITING, &vcc->flags);
 129         prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
 130         sigd_enq(vcc, as_bind, NULL, NULL, &vcc->local);
 131         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
 132                 schedule();
 133                 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
 134         }
 135         finish_wait(sk_sleep(sk), &wait);
 136         clear_bit(ATM_VF_REGIS, &vcc->flags); /* doesn't count */
 137         if (!sigd) {
 138                 error = -EUNATCH;
 139                 goto out;
 140         }
 141         if (!sk->sk_err)
 142                 set_bit(ATM_VF_BOUND, &vcc->flags);
 143         error = -sk->sk_err;
 144 out:
 145         release_sock(sk);
 146         return error;
 147 }
 148
 149 static int svc_connect(struct socket *sock, struct sockaddr *sockaddr,
 150                        int sockaddr_len, int flags)
 151 {
 152         DEFINE_WAIT(wait);
 153         struct sock *sk = sock->sk;
 154         struct sockaddr_atmsvc *addr;
 155         struct atm_vcc *vcc = ATM_SD(sock);
 156         int error;
 157
 158         pr_debug("%p\n", vcc);
 159         lock_sock(sk);
 160         if (sockaddr_len != sizeof(struct sockaddr_atmsvc)) {
 161                 error = -EINVAL;
 162                 goto out;
 163         }
 164
 165         switch (sock->state) {
 166         default:
 167                 error = -EINVAL;
 168                 goto out;
 169         case SS_CONNECTED:
 170                 error = -EISCONN;
 171                 goto out;
 172         case SS_CONNECTING:
 173                 if (test_bit(ATM_VF_WAITING, &vcc->flags)) {
 174                         error = -EALREADY;
 175                         goto out;
 176                 }
 177                 sock->state = SS_UNCONNECTED;
 178                 if (sk->sk_err) {
 179                         error = -sk->sk_err;
 180                         goto out;
 181                 }
 182                 break;
 183         case SS_UNCONNECTED:
 184                 addr = (struct sockaddr_atmsvc *) sockaddr;
 185                 if (addr->sas_family != AF_ATMSVC) {
 186                         error = -EAFNOSUPPORT;
 187                         goto out;
 188                 }
 189                 if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) {
 190                         error = -EBADFD;
 191                         goto out;
 192                 }
 193                 if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS ||
 194                     vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) {
 195                         error = -EINVAL;
 196                         goto out;
 197                 }
 198                 if (!vcc->qos.txtp.traffic_class &&
 199                     !vcc->qos.rxtp.traffic_class) {
 200                         error = -EINVAL;
 201                         goto out;
 202                 }
 203                 vcc->remote = *addr;
 204                 set_bit(ATM_VF_WAITING, &vcc->flags);
 205                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 206                 sigd_enq(vcc, as_connect, NULL, NULL, &vcc->remote);
 207                 if (flags & O_NONBLOCK) {
 208                         finish_wait(sk_sleep(sk), &wait);
 209                         sock->state = SS_CONNECTING;
 210                         error = -EINPROGRESS;
 211                         goto out;
 212                 }
 213                 error = 0;
 214                 while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
 215                         schedule();
 216                         if (!signal_pending(current)) {
 217                                 prepare_to_wait(sk_sleep(sk), &wait,
 218                                                 TASK_INTERRUPTIBLE);
 219                                 continue;
 220                         }
 221                         pr_debug("*ABORT*\n");
 222                         /*
 223                          * This is tricky:
 224                          *   Kernel ---close--> Demon
 225                          *   Kernel <--close--- Demon
 226                          * or
 227                          *   Kernel ---close--> Demon
 228                          *   Kernel <--error--- Demon
 229                          * or
 230                          *   Kernel ---close--> Demon
 231                          *   Kernel <--okay---- Demon
 232                          *   Kernel <--close--- Demon
 233                          */
 234                         sigd_enq(vcc, as_close, NULL, NULL, NULL);
 235                         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
 236                                 prepare_to_wait(sk_sleep(sk), &wait,
 237                                                 TASK_INTERRUPTIBLE);
 238                                 schedule();
 239                         }
 240                         if (!sk->sk_err)
 241                                 while (!test_bit(ATM_VF_RELEASED, &vcc->flags) &&
 242                                        sigd) {
 243                                         prepare_to_wait(sk_sleep(sk), &wait,
 244                                                         TASK_INTERRUPTIBLE);
 245                                         schedule();
 246                                 }
 247                         clear_bit(ATM_VF_REGIS, &vcc->flags);
 248                         clear_bit(ATM_VF_RELEASED, &vcc->flags);
 249                         clear_bit(ATM_VF_CLOSE, &vcc->flags);
 250                             /* we're gone now but may connect later */
 251                         error = -EINTR;
 252                         break;
 253                 }
 254                 finish_wait(sk_sleep(sk), &wait);
 255                 if (error)
 256                         goto out;
 257                 if (!sigd) {
 258                         error = -EUNATCH;
 259                         goto out;
 260                 }
 261                 if (sk->sk_err) {
 262                         error = -sk->sk_err;
 263                         goto out;
 264                 }
 265         }
 266
 267         vcc->qos.txtp.max_pcr = SELECT_TOP_PCR(vcc->qos.txtp);
 268         vcc->qos.txtp.pcr = 0;
 269         vcc->qos.txtp.min_pcr = 0;
 270
 271         error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
 272         if (!error)
 273                 sock->state = SS_CONNECTED;
 274         else
 275                 (void)svc_disconnect(vcc);
 276 out:
 277         release_sock(sk);
 278         return error;
 279 }
 280
 281 static int svc_listen(struct socket *sock, int backlog)
 282 {
 283         DEFINE_WAIT(wait);
 284         struct sock *sk = sock->sk;
 285         struct atm_vcc *vcc = ATM_SD(sock);
 286         int error;
 287
 288         pr_debug("%p\n", vcc);
 289         lock_sock(sk);
 290         /* let server handle listen on unbound sockets */
 291         if (test_bit(ATM_VF_SESSION, &vcc->flags)) {
 292                 error = -EINVAL;
 293                 goto out;
 294         }
 295         if (test_bit(ATM_VF_LISTEN, &vcc->flags)) {
 296                 error = -EADDRINUSE;
 297                 goto out;
 298         }
 299         set_bit(ATM_VF_WAITING, &vcc->flags);
 300         prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
 301         sigd_enq(vcc, as_listen, NULL, NULL, &vcc->local);
 302         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
 303                 schedule();
 304                 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
 305         }
 306         finish_wait(sk_sleep(sk), &wait);
 307         if (!sigd) {
 308                 error = -EUNATCH;
 309                 goto out;
 310         }
 311         set_bit(ATM_VF_LISTEN, &vcc->flags);
 312         vcc_insert_socket(sk);
 313         sk->sk_max_ack_backlog = backlog > 0 ? backlog : ATM_BACKLOG_DEFAULT;
 314         error = -sk->sk_err;
 315 out:
 316         release_sock(sk);
 317         return error;
 318 }
 319
 320 static int svc_accept(struct socket *sock, struct socket *newsock, int flags)
 321 {
 322         struct sock *sk = sock->sk;
 323         struct sk_buff *skb;
 324         struct atmsvc_msg *msg;
 325         struct atm_vcc *old_vcc = ATM_SD(sock);
 326         struct atm_vcc *new_vcc;
 327         int error;
 328
 329         lock_sock(sk);
 330
 331         error = svc_create(sock_net(sk), newsock, 0, 0);
 332         if (error)
 333                 goto out;
 334
 335         new_vcc = ATM_SD(newsock);
 336
 337         pr_debug("%p -> %p\n", old_vcc, new_vcc);
 338         while (1) {
 339                 DEFINE_WAIT(wait);
 340
 341                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 342                 while (!(skb = skb_dequeue(&sk->sk_receive_queue)) &&
 343                        sigd) {
 344                         if (test_bit(ATM_VF_RELEASED, &old_vcc->flags))
 345                                 break;
 346                         if (test_bit(ATM_VF_CLOSE, &old_vcc->flags)) {
 347                                 error = -sk->sk_err;
 348                                 break;
 349                         }
 350                         if (flags & O_NONBLOCK) {
 351                                 error = -EAGAIN;
 352                                 break;
 353                         }
 354                         release_sock(sk);
 355                         schedule();
 356                         lock_sock(sk);
 357                         if (signal_pending(current)) {
 358                                 error = -ERESTARTSYS;
 359                                 break;
 360                         }
 361                         prepare_to_wait(sk_sleep(sk), &wait,
 362                                         TASK_INTERRUPTIBLE);
 363                 }
 364                 finish_wait(sk_sleep(sk), &wait);
 365                 if (error)
 366                         goto out;
 367                 if (!skb) {
 368                         error = -EUNATCH;
 369                         goto out;
 370                 }
 371                 msg = (struct atmsvc_msg *)skb->data;
 372                 new_vcc->qos = msg->qos;
 373                 set_bit(ATM_VF_HASQOS, &new_vcc->flags);
 374                 new_vcc->remote = msg->svc;
 375                 new_vcc->local = msg->local;
 376                 new_vcc->sap = msg->sap;
 377                 error = vcc_connect(newsock, msg->pvc.sap_addr.itf,
 378                                     msg->pvc.sap_addr.vpi,
 379                                     msg->pvc.sap_addr.vci);
 380                 dev_kfree_skb(skb);
 381                 sk->sk_ack_backlog--;
 382                 if (error) {
 383                         sigd_enq2(NULL, as_reject, old_vcc, NULL, NULL,
 384                                   &old_vcc->qos, error);
 385                         error = error == -EAGAIN ? -EBUSY : error;
 386                         goto out;
 387                 }
 388                 /* wait should be short, so we ignore the non-blocking flag */
 389                 set_bit(ATM_VF_WAITING, &new_vcc->flags);
 390                 prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
 391                                 TASK_UNINTERRUPTIBLE);
 392                 sigd_enq(new_vcc, as_accept, old_vcc, NULL, NULL);
 393                 while (test_bit(ATM_VF_WAITING, &new_vcc->flags) && sigd) {
 394                         release_sock(sk);
 395                         schedule();
 396                         lock_sock(sk);
 397                         prepare_to_wait(sk_sleep(sk_atm(new_vcc)), &wait,
 398                                         TASK_UNINTERRUPTIBLE);
 399                 }
 400                 finish_wait(sk_sleep(sk_atm(new_vcc)), &wait);
 401                 if (!sigd) {
 402                         error = -EUNATCH;
 403                         goto out;
 404                 }
 405                 if (!sk_atm(new_vcc)->sk_err)
 406                         break;
 407                 if (sk_atm(new_vcc)->sk_err != ERESTARTSYS) {
 408                         error = -sk_atm(new_vcc)->sk_err;
 409                         goto out;
 410                 }
 411         }
 412         newsock->state = SS_CONNECTED;
 413 out:
 414         release_sock(sk);
 415         return error;
 416 }
 417
 418 static int svc_getname(struct socket *sock, struct sockaddr *sockaddr,
 419                        int *sockaddr_len, int peer)
 420 {
 421         struct sockaddr_atmsvc *addr;
 422
 423         *sockaddr_len = sizeof(struct sockaddr_atmsvc);
 424         addr = (struct sockaddr_atmsvc *) sockaddr;
 425         memcpy(addr, peer ? &ATM_SD(sock)->remote : &ATM_SD(sock)->local,
 426                sizeof(struct sockaddr_atmsvc));
 427         return 0;
 428 }
 429
 430 int svc_change_qos(struct atm_vcc *vcc, struct atm_qos *qos)
 431 {
 432         struct sock *sk = sk_atm(vcc);
 433         DEFINE_WAIT(wait);
 434
 435         set_bit(ATM_VF_WAITING, &vcc->flags);
 436         prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
 437         sigd_enq2(vcc, as_modify, NULL, NULL, &vcc->local, qos, 0);
 438         while (test_bit(ATM_VF_WAITING, &vcc->flags) &&
 439                !test_bit(ATM_VF_RELEASED, &vcc->flags) && sigd) {
 440                 schedule();
 441                 prepare_to_wait(sk_sleep(sk), &wait, TASK_UNINTERRUPTIBLE);
 442         }
 443         finish_wait(sk_sleep(sk), &wait);
 444         if (!sigd)
 445                 return -EUNATCH;
 446         return -sk->sk_err;
 447 }
 448
 449 static int svc_setsockopt(struct socket *sock, int level, int optname,
 450                           char __user *optval, unsigned int optlen)
 451 {
 452         struct sock *sk = sock->sk;
 453         struct atm_vcc *vcc = ATM_SD(sock);
 454         int value, error = 0;
 455
 456         lock_sock(sk);
 457         switch (optname) {
 458         case SO_ATMSAP:
 459                 if (level != SOL_ATM || optlen != sizeof(struct atm_sap)) {
 460                         error = -EINVAL;
 461                         goto out;
 462                 }
 463                 if (copy_from_user(&vcc->sap, optval, optlen)) {
 464                         error = -EFAULT;
 465                         goto out;
 466                 }
 467                 set_bit(ATM_VF_HASSAP, &vcc->flags);
 468                 break;
 469         case SO_MULTIPOINT:
 470                 if (level != SOL_ATM || optlen != sizeof(int)) {
 471                         error = -EINVAL;
 472                         goto out;
 473                 }
 474                 if (get_user(value, (int __user *)optval)) {
 475                         error = -EFAULT;
 476                         goto out;
 477                 }
 478                 if (value == 1)
 479                         set_bit(ATM_VF_SESSION, &vcc->flags);
 480                 else if (value == 0)
 481                         clear_bit(ATM_VF_SESSION, &vcc->flags);
 482                 else
 483                         error = -EINVAL;
 484                 break;
 485         default:
 486                 error = vcc_setsockopt(sock, level, optname, optval, optlen);
 487         }
 488
 489 out:
 490         release_sock(sk);
 491         return error;
 492 }
 493
 494 static int svc_getsockopt(struct socket *sock, int level, int optname,
 495                           char __user *optval, int __user *optlen)
 496 {
 497         struct sock *sk = sock->sk;
 498         int error = 0, len;
 499
 500         lock_sock(sk);
 501         if (!__SO_LEVEL_MATCH(optname, level) || optname != SO_ATMSAP) {
 502                 error = vcc_getsockopt(sock, level, optname, optval, optlen);
 503                 goto out;
 504         }
 505         if (get_user(len, optlen)) {
 506                 error = -EFAULT;
 507                 goto out;
 508         }
 509         if (len != sizeof(struct atm_sap)) {
 510                 error = -EINVAL;
 511                 goto out;
 512         }
 513         if (copy_to_user(optval, &ATM_SD(sock)->sap, sizeof(struct atm_sap))) {
 514                 error = -EFAULT;
 515                 goto out;
 516         }
 517 out:
 518         release_sock(sk);
 519         return error;
 520 }
 521
 522 static int svc_addparty(struct socket *sock, struct sockaddr *sockaddr,
 523                         int sockaddr_len, int flags)
 524 {
 525         DEFINE_WAIT(wait);
 526         struct sock *sk = sock->sk;
 527         struct atm_vcc *vcc = ATM_SD(sock);
 528         int error;
 529
 530         lock_sock(sk);
 531         set_bit(ATM_VF_WAITING, &vcc->flags);
 532         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 533         sigd_enq(vcc, as_addparty, NULL, NULL,
 534                  (struct sockaddr_atmsvc *) sockaddr);
 535         if (flags & O_NONBLOCK) {
 536                 finish_wait(sk_sleep(sk), &wait);
 537                 error = -EINPROGRESS;
 538                 goto out;
 539         }
 540         pr_debug("added wait queue\n");
 541         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
 542                 schedule();
 543                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 544         }
 545         finish_wait(sk_sleep(sk), &wait);
 546         error = xchg(&sk->sk_err_soft, 0);
 547 out:
 548         release_sock(sk);
 549         return error;
 550 }
 551
 552 static int svc_dropparty(struct socket *sock, int ep_ref)
 553 {
 554         DEFINE_WAIT(wait);
 555         struct sock *sk = sock->sk;
 556         struct atm_vcc *vcc = ATM_SD(sock);
 557         int error;
 558
 559         lock_sock(sk);
 560         set_bit(ATM_VF_WAITING, &vcc->flags);
 561         prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 562         sigd_enq2(vcc, as_dropparty, NULL, NULL, NULL, NULL, ep_ref);
 563         while (test_bit(ATM_VF_WAITING, &vcc->flags) && sigd) {
 564                 schedule();
 565                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 566         }
 567         finish_wait(sk_sleep(sk), &wait);
 568         if (!sigd) {
 569                 error = -EUNATCH;
 570                 goto out;
 571         }
 572         error = xchg(&sk->sk_err_soft, 0);
 573 out:
 574         release_sock(sk);
 575         return error;
 576 }
 577
 578 static int svc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 579 {
 580         int error, ep_ref;
 581         struct sockaddr_atmsvc sa;
 582         struct atm_vcc *vcc = ATM_SD(sock);
 583
 584         switch (cmd) {
 585         case ATM_ADDPARTY:
 586                 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
 587                         return -EINVAL;
 588                 if (copy_from_user(&sa, (void __user *) arg, sizeof(sa)))
 589                         return -EFAULT;
 590                 error = svc_addparty(sock, (struct sockaddr *)&sa, sizeof(sa),
 591                                      0);
 592                 break;
 593         case ATM_DROPPARTY:
 594                 if (!test_bit(ATM_VF_SESSION, &vcc->flags))
 595                         return -EINVAL;
 596                 if (copy_from_user(&ep_ref, (void __user *) arg, sizeof(int)))
 597                         return -EFAULT;
 598                 error = svc_dropparty(sock, ep_ref);
 599                 break;
 600         default:
 601                 error = vcc_ioctl(sock, cmd, arg);
 602         }
 603
 604         return error;
 605 }
 606
 607 #ifdef CONFIG_COMPAT
 608 static int svc_compat_ioctl(struct socket *sock, unsigned int cmd,
 609                             unsigned long arg)
 610 {
 611         /* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf.
 612            But actually it takes a struct sockaddr_atmsvc, which doesn't need
 613            compat handling. So all we have to do is fix up cmd... */
 614         if (cmd == COMPAT_ATM_ADDPARTY)
 615                 cmd = ATM_ADDPARTY;
 616
 617         if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
 618                 return svc_ioctl(sock, cmd, arg);
 619         else
 620                 return vcc_compat_ioctl(sock, cmd, arg);
 621 }
 622 #endif /* CONFIG_COMPAT */
 623
 624 static const struct proto_ops svc_proto_ops = {
 625         .family =       PF_ATMSVC,
 626         .owner =        THIS_MODULE,
 627
 628         .release =      svc_release,
 629         .bind =         svc_bind,
 630         .connect =      svc_connect,
 631         .socketpair =   sock_no_socketpair,
 632         .accept =       svc_accept,
 633         .getname =      svc_getname,
 634         .poll =         vcc_poll,
 635         .ioctl =        svc_ioctl,
 636 #ifdef CONFIG_COMPAT
 637         .compat_ioctl = svc_compat_ioctl,
 638 #endif
 639         .listen =       svc_listen,
 640         .shutdown =     svc_shutdown,
 641         .setsockopt =   svc_setsockopt,
 642         .getsockopt =   svc_getsockopt,
 643         .sendmsg =      vcc_sendmsg,
 644         .recvmsg =      vcc_recvmsg,
 645         .mmap =         sock_no_mmap,
 646         .sendpage =     sock_no_sendpage,
 647 };
 648
 649
 650 static int svc_create(struct net *net, struct socket *sock, int protocol,
 651                       int kern)
 652 {
 653         int error;
 654
 655         if (!net_eq(net, &init_net))
 656                 return -EAFNOSUPPORT;
 657
 658         sock->ops = &svc_proto_ops;
 659         error = vcc_create(net, sock, protocol, AF_ATMSVC);
 660         if (error)
 661                 return error;
 662         ATM_SD(sock)->local.sas_family = AF_ATMSVC;
 663         ATM_SD(sock)->remote.sas_family = AF_ATMSVC;
 664         return 0;
 665 }
 666
 667 static const struct net_proto_family svc_family_ops = {
 668         .family = PF_ATMSVC,
 669         .create = svc_create,
 670         .owner = THIS_MODULE,
 671 };
 672
 673
 674 /*
 675  *      Initialize the ATM SVC protocol family
 676  */
 677
 678 int __init atmsvc_init(void)
 679 {
 680         return sock_register(&svc_family_ops);
 681 }
 682
 683 void atmsvc_exit(void)
 684 {
 685         sock_unregister(PF_ATMSVC);
 686 }