SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/iucv/af_iucv.c

   1 /*
   2  *  linux/net/iucv/af_iucv.c
   3  *
   4  *  IUCV protocol stack for Linux on zSeries
   5  *
   6  *  Copyright 2006 IBM Corporation
   7  *
   8  *  Author(s):  Jennifer Hunt <jenhunt@us.ibm.com>
   9  */
  10
  11 #define KMSG_COMPONENT "af_iucv"
  12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/list.h>
  17 #include <linux/errno.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/slab.h>
  21 #include <linux/skbuff.h>
  22 #include <linux/init.h>
  23 #include <linux/poll.h>
  24 #include <net/sock.h>
  25 #include <asm/ebcdic.h>
  26 #include <asm/cpcmd.h>
  27 #include <linux/kmod.h>
  28
  29 #include <net/iucv/iucv.h>
  30 #include <net/iucv/af_iucv.h>
  31
  32 #define VERSION "1.1"
  33
  34 static char iucv_userid[80];
  35
  36 static struct proto_ops iucv_sock_ops;
  37
  38 static struct proto iucv_proto = {
  39         .name           = "AF_IUCV",
  40         .owner          = THIS_MODULE,
  41         .obj_size       = sizeof(struct iucv_sock),
  42 };
  43
  44 /* special AF_IUCV IPRM messages */
  45 static const u8 iprm_shutdown[8] =
  46         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  47
  48 static void iucv_sock_kill(struct sock *sk);
  49 static void iucv_sock_close(struct sock *sk);
  50
  51 /* Call Back functions */
  52 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  53 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  54 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
  55 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
  56                                  u8 ipuser[16]);
  57 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
  58 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
  59
  60 static struct iucv_sock_list iucv_sk_list = {
  61         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
  62         .autobind_name = ATOMIC_INIT(0)
  63 };
  64
  65 static struct iucv_handler af_iucv_handler = {
  66         .path_pending     = iucv_callback_connreq,
  67         .path_complete    = iucv_callback_connack,
  68         .path_severed     = iucv_callback_connrej,
  69         .message_pending  = iucv_callback_rx,
  70         .message_complete = iucv_callback_txdone,
  71         .path_quiesced    = iucv_callback_shutdown,
  72 };
  73
  74 static inline void high_nmcpy(unsigned char *dst, char *src)
  75 {
  76        memcpy(dst, src, 8);
  77 }
  78
  79 static inline void low_nmcpy(unsigned char *dst, char *src)
  80 {
  81        memcpy(&dst[8], src, 8);
  82 }
  83
  84 /**
  85  * iucv_msg_length() - Returns the length of an iucv message.
  86  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
  87  *
  88  * The function returns the length of the specified iucv message @msg of data
  89  * stored in a buffer and of data stored in the parameter list (PRMDATA).
  90  *
  91  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
  92  * data:
  93  *      PRMDATA[0..6]   socket data (max 7 bytes);
  94  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
  95  *
  96  * The socket data length is computed by substracting the socket data length
  97  * value from 0xFF.
  98  * If the socket data len is greater 7, then PRMDATA can be used for special
  99  * notifications (see iucv_sock_shutdown); and further,
 100  * if the socket data len is > 7, the function returns 8.
 101  *
 102  * Use this function to allocate socket buffers to store iucv message data.
 103  */
 104 static inline size_t iucv_msg_length(struct iucv_message *msg)
 105 {
 106         size_t datalen;
 107
 108         if (msg->flags & IUCV_IPRMDATA) {
 109                 datalen = 0xff - msg->rmmsg[7];
 110                 return (datalen < 8) ? datalen : 8;
 111         }
 112         return msg->length;
 113 }
 114
 115 /* Timers */
 116 static void iucv_sock_timeout(unsigned long arg)
 117 {
 118         struct sock *sk = (struct sock *)arg;
 119
 120         bh_lock_sock(sk);
 121         sk->sk_err = ETIMEDOUT;
 122         sk->sk_state_change(sk);
 123         bh_unlock_sock(sk);
 124
 125         iucv_sock_kill(sk);
 126         sock_put(sk);
 127 }
 128
 129 static void iucv_sock_clear_timer(struct sock *sk)
 130 {
 131         sk_stop_timer(sk, &sk->sk_timer);
 132 }
 133
 134 static struct sock *__iucv_get_sock_by_name(char *nm)
 135 {
 136         struct sock *sk;
 137         struct hlist_node *node;
 138
 139         sk_for_each(sk, node, &iucv_sk_list.head)
 140                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 141                         return sk;
 142
 143         return NULL;
 144 }
 145
 146 static void iucv_sock_destruct(struct sock *sk)
 147 {
 148         skb_queue_purge(&sk->sk_receive_queue);
 149         skb_queue_purge(&sk->sk_write_queue);
 150 }
 151
 152 /* Cleanup Listen */
 153 static void iucv_sock_cleanup_listen(struct sock *parent)
 154 {
 155         struct sock *sk;
 156
 157         /* Close non-accepted connections */
 158         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 159                 iucv_sock_close(sk);
 160                 iucv_sock_kill(sk);
 161         }
 162
 163         parent->sk_state = IUCV_CLOSED;
 164         sock_set_flag(parent, SOCK_ZAPPED);
 165 }
 166
 167 /* Kill socket */
 168 static void iucv_sock_kill(struct sock *sk)
 169 {
 170         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 171                 return;
 172
 173         iucv_sock_unlink(&iucv_sk_list, sk);
 174         sock_set_flag(sk, SOCK_DEAD);
 175         sock_put(sk);
 176 }
 177
 178 /* Close an IUCV socket */
 179 static void iucv_sock_close(struct sock *sk)
 180 {
 181         unsigned char user_data[16];
 182         struct iucv_sock *iucv = iucv_sk(sk);
 183         int err;
 184         unsigned long timeo;
 185
 186         iucv_sock_clear_timer(sk);
 187         lock_sock(sk);
 188
 189         switch (sk->sk_state) {
 190         case IUCV_LISTEN:
 191                 iucv_sock_cleanup_listen(sk);
 192                 break;
 193
 194         case IUCV_CONNECTED:
 195         case IUCV_DISCONN:
 196                 err = 0;
 197
 198                 sk->sk_state = IUCV_CLOSING;
 199                 sk->sk_state_change(sk);
 200
 201                 if (!skb_queue_empty(&iucv->send_skb_q)) {
 202                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 203                                 timeo = sk->sk_lingertime;
 204                         else
 205                                 timeo = IUCV_DISCONN_TIMEOUT;
 206                         err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
 207                 }
 208
 209                 sk->sk_state = IUCV_CLOSED;
 210                 sk->sk_state_change(sk);
 211
 212                 if (iucv->path) {
 213                         low_nmcpy(user_data, iucv->src_name);
 214                         high_nmcpy(user_data, iucv->dst_name);
 215                         ASCEBC(user_data, sizeof(user_data));
 216                         err = iucv_path_sever(iucv->path, user_data);
 217                         iucv_path_free(iucv->path);
 218                         iucv->path = NULL;
 219                 }
 220
 221                 sk->sk_err = ECONNRESET;
 222                 sk->sk_state_change(sk);
 223
 224                 skb_queue_purge(&iucv->send_skb_q);
 225                 skb_queue_purge(&iucv->backlog_skb_q);
 226
 227                 sock_set_flag(sk, SOCK_ZAPPED);
 228                 break;
 229
 230         default:
 231                 sock_set_flag(sk, SOCK_ZAPPED);
 232                 break;
 233         }
 234
 235         release_sock(sk);
 236         iucv_sock_kill(sk);
 237 }
 238
 239 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 240 {
 241         if (parent)
 242                 sk->sk_type = parent->sk_type;
 243 }
 244
 245 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 246 {
 247         struct sock *sk;
 248
 249         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
 250         if (!sk)
 251                 return NULL;
 252
 253         sock_init_data(sock, sk);
 254         INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
 255         spin_lock_init(&iucv_sk(sk)->accept_q_lock);
 256         skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
 257         INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
 258         spin_lock_init(&iucv_sk(sk)->message_q.lock);
 259         skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
 260         iucv_sk(sk)->send_tag = 0;
 261         iucv_sk(sk)->flags = 0;
 262
 263         sk->sk_destruct = iucv_sock_destruct;
 264         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 265         sk->sk_allocation = GFP_DMA;
 266
 267         sock_reset_flag(sk, SOCK_ZAPPED);
 268
 269         sk->sk_protocol = proto;
 270         sk->sk_state    = IUCV_OPEN;
 271
 272         setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
 273
 274         iucv_sock_link(&iucv_sk_list, sk);
 275         return sk;
 276 }
 277
 278 /* Create an IUCV socket */
 279 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
 280 {
 281         struct sock *sk;
 282
 283         if (sock->type != SOCK_STREAM)
 284                 return -ESOCKTNOSUPPORT;
 285
 286         sock->state = SS_UNCONNECTED;
 287         sock->ops = &iucv_sock_ops;
 288
 289         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
 290         if (!sk)
 291                 return -ENOMEM;
 292
 293         iucv_sock_init(sk, NULL);
 294
 295         return 0;
 296 }
 297
 298 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 299 {
 300         write_lock_bh(&l->lock);
 301         sk_add_node(sk, &l->head);
 302         write_unlock_bh(&l->lock);
 303 }
 304
 305 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 306 {
 307         write_lock_bh(&l->lock);
 308         sk_del_node_init(sk);
 309         write_unlock_bh(&l->lock);
 310 }
 311
 312 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 313 {
 314         unsigned long flags;
 315         struct iucv_sock *par = iucv_sk(parent);
 316
 317         sock_hold(sk);
 318         spin_lock_irqsave(&par->accept_q_lock, flags);
 319         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 320         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 321         iucv_sk(sk)->parent = parent;
 322         parent->sk_ack_backlog++;
 323 }
 324
 325 void iucv_accept_unlink(struct sock *sk)
 326 {
 327         unsigned long flags;
 328         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 329
 330         spin_lock_irqsave(&par->accept_q_lock, flags);
 331         list_del_init(&iucv_sk(sk)->accept_q);
 332         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 333         iucv_sk(sk)->parent->sk_ack_backlog--;
 334         iucv_sk(sk)->parent = NULL;
 335         sock_put(sk);
 336 }
 337
 338 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 339 {
 340         struct iucv_sock *isk, *n;
 341         struct sock *sk;
 342
 343         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 344                 sk = (struct sock *) isk;
 345                 lock_sock(sk);
 346
 347                 if (sk->sk_state == IUCV_CLOSED) {
 348                         iucv_accept_unlink(sk);
 349                         release_sock(sk);
 350                         continue;
 351                 }
 352
 353                 if (sk->sk_state == IUCV_CONNECTED ||
 354                     sk->sk_state == IUCV_SEVERED ||
 355                     !newsock) {
 356                         iucv_accept_unlink(sk);
 357                         if (newsock)
 358                                 sock_graft(sk, newsock);
 359
 360                         if (sk->sk_state == IUCV_SEVERED)
 361                                 sk->sk_state = IUCV_DISCONN;
 362
 363                         release_sock(sk);
 364                         return sk;
 365                 }
 366
 367                 release_sock(sk);
 368         }
 369         return NULL;
 370 }
 371
 372 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
 373                          unsigned long timeo)
 374 {
 375         DECLARE_WAITQUEUE(wait, current);
 376         int err = 0;
 377
 378         add_wait_queue(sk->sk_sleep, &wait);
 379         while (sk->sk_state != state && sk->sk_state != state2) {
 380                 set_current_state(TASK_INTERRUPTIBLE);
 381
 382                 if (!timeo) {
 383                         err = -EAGAIN;
 384                         break;
 385                 }
 386
 387                 if (signal_pending(current)) {
 388                         err = sock_intr_errno(timeo);
 389                         break;
 390                 }
 391
 392                 release_sock(sk);
 393                 timeo = schedule_timeout(timeo);
 394                 lock_sock(sk);
 395
 396                 err = sock_error(sk);
 397                 if (err)
 398                         break;
 399         }
 400         set_current_state(TASK_RUNNING);
 401         remove_wait_queue(sk->sk_sleep, &wait);
 402         return err;
 403 }
 404
 405 /* Bind an unbound socket */
 406 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 407                           int addr_len)
 408 {
 409         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 410         struct sock *sk = sock->sk;
 411         struct iucv_sock *iucv;
 412         int err;
 413
 414         /* Verify the input sockaddr */
 415         if (!addr || addr->sa_family != AF_IUCV)
 416                 return -EINVAL;
 417
 418         lock_sock(sk);
 419         if (sk->sk_state != IUCV_OPEN) {
 420                 err = -EBADFD;
 421                 goto done;
 422         }
 423
 424         write_lock_bh(&iucv_sk_list.lock);
 425
 426         iucv = iucv_sk(sk);
 427         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 428                 err = -EADDRINUSE;
 429                 goto done_unlock;
 430         }
 431         if (iucv->path) {
 432                 err = 0;
 433                 goto done_unlock;
 434         }
 435
 436         /* Bind the socket */
 437         memcpy(iucv->src_name, sa->siucv_name, 8);
 438
 439         /* Copy the user id */
 440         memcpy(iucv->src_user_id, iucv_userid, 8);
 441         sk->sk_state = IUCV_BOUND;
 442         err = 0;
 443
 444 done_unlock:
 445         /* Release the socket list lock */
 446         write_unlock_bh(&iucv_sk_list.lock);
 447 done:
 448         release_sock(sk);
 449         return err;
 450 }
 451
 452 /* Automatically bind an unbound socket */
 453 static int iucv_sock_autobind(struct sock *sk)
 454 {
 455         struct iucv_sock *iucv = iucv_sk(sk);
 456         char query_buffer[80];
 457         char name[12];
 458         int err = 0;
 459
 460         /* Set the userid and name */
 461         cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
 462         if (unlikely(err))
 463                 return -EPROTO;
 464
 465         memcpy(iucv->src_user_id, query_buffer, 8);
 466
 467         write_lock_bh(&iucv_sk_list.lock);
 468
 469         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 470         while (__iucv_get_sock_by_name(name)) {
 471                 sprintf(name, "%08x",
 472                         atomic_inc_return(&iucv_sk_list.autobind_name));
 473         }
 474
 475         write_unlock_bh(&iucv_sk_list.lock);
 476
 477         memcpy(&iucv->src_name, name, 8);
 478
 479         return err;
 480 }
 481
 482 /* Connect an unconnected socket */
 483 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 484                              int alen, int flags)
 485 {
 486         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 487         struct sock *sk = sock->sk;
 488         struct iucv_sock *iucv;
 489         unsigned char user_data[16];
 490         int err;
 491
 492         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 493                 return -EINVAL;
 494
 495         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 496                 return -EBADFD;
 497
 498         if (sk->sk_type != SOCK_STREAM)
 499                 return -EINVAL;
 500
 501         iucv = iucv_sk(sk);
 502
 503         if (sk->sk_state == IUCV_OPEN) {
 504                 err = iucv_sock_autobind(sk);
 505                 if (unlikely(err))
 506                         return err;
 507         }
 508
 509         lock_sock(sk);
 510
 511         /* Set the destination information */
 512         memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
 513         memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
 514
 515         high_nmcpy(user_data, sa->siucv_name);
 516         low_nmcpy(user_data, iucv_sk(sk)->src_name);
 517         ASCEBC(user_data, sizeof(user_data));
 518
 519         iucv = iucv_sk(sk);
 520         /* Create path. */
 521         iucv->path = iucv_path_alloc(IUCV_QUEUELEN_DEFAULT,
 522                                      IUCV_IPRMDATA, GFP_KERNEL);
 523         if (!iucv->path) {
 524                 err = -ENOMEM;
 525                 goto done;
 526         }
 527         err = iucv_path_connect(iucv->path, &af_iucv_handler,
 528                                 sa->siucv_user_id, NULL, user_data, sk);
 529         if (err) {
 530                 iucv_path_free(iucv->path);
 531                 iucv->path = NULL;
 532                 switch (err) {
 533                 case 0x0b:      /* Target communicator is not logged on */
 534                         err = -ENETUNREACH;
 535                         break;
 536                 case 0x0d:      /* Max connections for this guest exceeded */
 537                 case 0x0e:      /* Max connections for target guest exceeded */
 538                         err = -EAGAIN;
 539                         break;
 540                 case 0x0f:      /* Missing IUCV authorization */
 541                         err = -EACCES;
 542                         break;
 543                 default:
 544                         err = -ECONNREFUSED;
 545                         break;
 546                 }
 547                 goto done;
 548         }
 549
 550         if (sk->sk_state != IUCV_CONNECTED) {
 551                 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
 552                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 553         }
 554
 555         if (sk->sk_state == IUCV_DISCONN) {
 556                 err = -ECONNREFUSED;
 557         }
 558
 559         if (err) {
 560                 iucv_path_sever(iucv->path, NULL);
 561                 iucv_path_free(iucv->path);
 562                 iucv->path = NULL;
 563         }
 564
 565 done:
 566         release_sock(sk);
 567         return err;
 568 }
 569
 570 /* Move a socket into listening state. */
 571 static int iucv_sock_listen(struct socket *sock, int backlog)
 572 {
 573         struct sock *sk = sock->sk;
 574         int err;
 575
 576         lock_sock(sk);
 577
 578         err = -EINVAL;
 579         if (sk->sk_state != IUCV_BOUND || sock->type != SOCK_STREAM)
 580                 goto done;
 581
 582         sk->sk_max_ack_backlog = backlog;
 583         sk->sk_ack_backlog = 0;
 584         sk->sk_state = IUCV_LISTEN;
 585         err = 0;
 586
 587 done:
 588         release_sock(sk);
 589         return err;
 590 }
 591
 592 /* Accept a pending connection */
 593 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 594                             int flags)
 595 {
 596         DECLARE_WAITQUEUE(wait, current);
 597         struct sock *sk = sock->sk, *nsk;
 598         long timeo;
 599         int err = 0;
 600
 601         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 602
 603         if (sk->sk_state != IUCV_LISTEN) {
 604                 err = -EBADFD;
 605                 goto done;
 606         }
 607
 608         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 609
 610         /* Wait for an incoming connection */
 611         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 612         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 613                 set_current_state(TASK_INTERRUPTIBLE);
 614                 if (!timeo) {
 615                         err = -EAGAIN;
 616                         break;
 617                 }
 618
 619                 release_sock(sk);
 620                 timeo = schedule_timeout(timeo);
 621                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 622
 623                 if (sk->sk_state != IUCV_LISTEN) {
 624                         err = -EBADFD;
 625                         break;
 626                 }
 627
 628                 if (signal_pending(current)) {
 629                         err = sock_intr_errno(timeo);
 630                         break;
 631                 }
 632         }
 633
 634         set_current_state(TASK_RUNNING);
 635         remove_wait_queue(sk->sk_sleep, &wait);
 636
 637         if (err)
 638                 goto done;
 639
 640         newsock->state = SS_CONNECTED;
 641
 642 done:
 643         release_sock(sk);
 644         return err;
 645 }
 646
 647 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 648                              int *len, int peer)
 649 {
 650         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 651         struct sock *sk = sock->sk;
 652
 653         addr->sa_family = AF_IUCV;
 654         *len = sizeof(struct sockaddr_iucv);
 655
 656         if (peer) {
 657                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
 658                 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
 659         } else {
 660                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
 661                 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
 662         }
 663         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 664         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
 665         memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
 666
 667         return 0;
 668 }
 669
 670 /**
 671  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
 672  * @path:       IUCV path
 673  * @msg:        Pointer to a struct iucv_message
 674  * @skb:        The socket data to send, skb->len MUST BE <= 7
 675  *
 676  * Send the socket data in the parameter list in the iucv message
 677  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
 678  * list and the socket data len at index 7 (last byte).
 679  * See also iucv_msg_length().
 680  *
 681  * Returns the error code from the iucv_message_send() call.
 682  */
 683 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
 684                           struct sk_buff *skb)
 685 {
 686         u8 prmdata[8];
 687
 688         memcpy(prmdata, (void *) skb->data, skb->len);
 689         prmdata[7] = 0xff - (u8) skb->len;
 690         return iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
 691                                  (void *) prmdata, 8);
 692 }
 693
 694 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 695                              struct msghdr *msg, size_t len)
 696 {
 697         struct sock *sk = sock->sk;
 698         struct iucv_sock *iucv = iucv_sk(sk);
 699         struct sk_buff *skb;
 700         struct iucv_message txmsg;
 701         char user_id[9];
 702         char appl_id[9];
 703         int err;
 704
 705         err = sock_error(sk);
 706         if (err)
 707                 return err;
 708
 709         if (msg->msg_flags & MSG_OOB)
 710                 return -EOPNOTSUPP;
 711
 712         lock_sock(sk);
 713
 714         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 715                 err = -EPIPE;
 716                 goto out;
 717         }
 718
 719         if (sk->sk_state == IUCV_CONNECTED) {
 720                 if (!(skb = sock_alloc_send_skb(sk, len,
 721                                                 msg->msg_flags & MSG_DONTWAIT,
 722                                                 &err)))
 723                         goto out;
 724
 725                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 726                         err = -EFAULT;
 727                         goto fail;
 728                 }
 729
 730                 txmsg.class = 0;
 731                 memcpy(&txmsg.class, skb->data, skb->len >= 4 ? 4 : skb->len);
 732                 txmsg.tag = iucv->send_tag++;
 733                 memcpy(skb->cb, &txmsg.tag, 4);
 734                 skb_queue_tail(&iucv->send_skb_q, skb);
 735
 736                 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
 737                     && skb->len <= 7) {
 738                         err = iucv_send_iprm(iucv->path, &txmsg, skb);
 739
 740                         /* on success: there is no message_complete callback
 741                          * for an IPRMDATA msg; remove skb from send queue */
 742                         if (err == 0) {
 743                                 skb_unlink(skb, &iucv->send_skb_q);
 744                                 kfree_skb(skb);
 745                         }
 746
 747                         /* this error should never happen since the
 748                          * IUCV_IPRMDATA path flag is set... sever path */
 749                         if (err == 0x15) {
 750                                 iucv_path_sever(iucv->path, NULL);
 751                                 skb_unlink(skb, &iucv->send_skb_q);
 752                                 err = -EPIPE;
 753                                 goto fail;
 754                         }
 755                 } else
 756                         err = iucv_message_send(iucv->path, &txmsg, 0, 0,
 757                                                 (void *) skb->data, skb->len);
 758                 if (err) {
 759                         if (err == 3) {
 760                                 user_id[8] = 0;
 761                                 memcpy(user_id, iucv->dst_user_id, 8);
 762                                 appl_id[8] = 0;
 763                                 memcpy(appl_id, iucv->dst_name, 8);
 764                                 pr_err("Application %s on z/VM guest %s"
 765                                        " exceeds message limit\n",
 766                                        user_id, appl_id);
 767                         }
 768                         skb_unlink(skb, &iucv->send_skb_q);
 769                         err = -EPIPE;
 770                         goto fail;
 771                 }
 772
 773         } else {
 774                 err = -ENOTCONN;
 775                 goto out;
 776         }
 777
 778         release_sock(sk);
 779         return len;
 780
 781 fail:
 782         kfree_skb(skb);
 783 out:
 784         release_sock(sk);
 785         return err;
 786 }
 787
 788 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
 789 {
 790         int dataleft, size, copied = 0;
 791         struct sk_buff *nskb;
 792
 793         dataleft = len;
 794         while (dataleft) {
 795                 if (dataleft >= sk->sk_rcvbuf / 4)
 796                         size = sk->sk_rcvbuf / 4;
 797                 else
 798                         size = dataleft;
 799
 800                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
 801                 if (!nskb)
 802                         return -ENOMEM;
 803
 804                 memcpy(nskb->data, skb->data + copied, size);
 805                 copied += size;
 806                 dataleft -= size;
 807
 808                 skb_reset_transport_header(nskb);
 809                 skb_reset_network_header(nskb);
 810                 nskb->len = size;
 811
 812                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
 813         }
 814
 815         return 0;
 816 }
 817
 818 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
 819                                  struct iucv_path *path,
 820                                  struct iucv_message *msg)
 821 {
 822         int rc;
 823         unsigned int len;
 824
 825         len = iucv_msg_length(msg);
 826
 827         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
 828         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
 829                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
 830                         skb->data = NULL;
 831                         skb->len = 0;
 832                 }
 833         } else {
 834                 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
 835                                           skb->data, len, NULL);
 836                 if (rc) {
 837                         kfree_skb(skb);
 838                         return;
 839                 }
 840                 if (skb->truesize >= sk->sk_rcvbuf / 4) {
 841                         rc = iucv_fragment_skb(sk, skb, len);
 842                         kfree_skb(skb);
 843                         skb = NULL;
 844                         if (rc) {
 845                                 iucv_path_sever(path, NULL);
 846                                 return;
 847                         }
 848                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
 849                 } else {
 850                         skb_reset_transport_header(skb);
 851                         skb_reset_network_header(skb);
 852                         skb->len = len;
 853                 }
 854         }
 855
 856         if (sock_queue_rcv_skb(sk, skb))
 857                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
 858 }
 859
 860 static void iucv_process_message_q(struct sock *sk)
 861 {
 862         struct iucv_sock *iucv = iucv_sk(sk);
 863         struct sk_buff *skb;
 864         struct sock_msg_q *p, *n;
 865
 866         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
 867                 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
 868                 if (!skb)
 869                         break;
 870                 iucv_process_message(sk, skb, p->path, &p->msg);
 871                 list_del(&p->list);
 872                 kfree(p);
 873                 if (!skb_queue_empty(&iucv->backlog_skb_q))
 874                         break;
 875         }
 876 }
 877
 878 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
 879                              struct msghdr *msg, size_t len, int flags)
 880 {
 881         int noblock = flags & MSG_DONTWAIT;
 882         struct sock *sk = sock->sk;
 883         struct iucv_sock *iucv = iucv_sk(sk);
 884         int target, copied = 0;
 885         struct sk_buff *skb, *rskb, *cskb;
 886         int err = 0;
 887
 888         if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
 889             skb_queue_empty(&iucv->backlog_skb_q) &&
 890             skb_queue_empty(&sk->sk_receive_queue) &&
 891             list_empty(&iucv->message_q.list))
 892                 return 0;
 893
 894         if (flags & (MSG_OOB))
 895                 return -EOPNOTSUPP;
 896
 897         target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
 898
 899         skb = skb_recv_datagram(sk, flags, noblock, &err);
 900         if (!skb) {
 901                 if (sk->sk_shutdown & RCV_SHUTDOWN)
 902                         return 0;
 903                 return err;
 904         }
 905
 906         copied = min_t(unsigned int, skb->len, len);
 907
 908         cskb = skb;
 909         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
 910                 skb_queue_head(&sk->sk_receive_queue, skb);
 911                 if (copied == 0)
 912                         return -EFAULT;
 913                 goto done;
 914         }
 915
 916         len -= copied;
 917
 918         /* Mark read part of skb as used */
 919         if (!(flags & MSG_PEEK)) {
 920                 skb_pull(skb, copied);
 921
 922                 if (skb->len) {
 923                         skb_queue_head(&sk->sk_receive_queue, skb);
 924                         goto done;
 925                 }
 926
 927                 kfree_skb(skb);
 928
 929                 /* Queue backlog skbs */
 930                 rskb = skb_dequeue(&iucv->backlog_skb_q);
 931                 while (rskb) {
 932                         if (sock_queue_rcv_skb(sk, rskb)) {
 933                                 skb_queue_head(&iucv->backlog_skb_q,
 934                                                 rskb);
 935                                 break;
 936                         } else {
 937                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
 938                         }
 939                 }
 940                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
 941                         spin_lock_bh(&iucv->message_q.lock);
 942                         if (!list_empty(&iucv->message_q.list))
 943                                 iucv_process_message_q(sk);
 944                         spin_unlock_bh(&iucv->message_q.lock);
 945                 }
 946
 947         } else
 948                 skb_queue_head(&sk->sk_receive_queue, skb);
 949
 950 done:
 951         return err ? : copied;
 952 }
 953
 954 static inline unsigned int iucv_accept_poll(struct sock *parent)
 955 {
 956         struct iucv_sock *isk, *n;
 957         struct sock *sk;
 958
 959         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 960                 sk = (struct sock *) isk;
 961
 962                 if (sk->sk_state == IUCV_CONNECTED)
 963                         return POLLIN | POLLRDNORM;
 964         }
 965
 966         return 0;
 967 }
 968
 969 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
 970                             poll_table *wait)
 971 {
 972         struct sock *sk = sock->sk;
 973         unsigned int mask = 0;
 974
 975         poll_wait(file, sk->sk_sleep, wait);
 976
 977         if (sk->sk_state == IUCV_LISTEN)
 978                 return iucv_accept_poll(sk);
 979
 980         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
 981                 mask |= POLLERR;
 982
 983         if (sk->sk_shutdown & RCV_SHUTDOWN)
 984                 mask |= POLLRDHUP;
 985
 986         if (sk->sk_shutdown == SHUTDOWN_MASK)
 987                 mask |= POLLHUP;
 988
 989         if (!skb_queue_empty(&sk->sk_receive_queue) ||
 990             (sk->sk_shutdown & RCV_SHUTDOWN))
 991                 mask |= POLLIN | POLLRDNORM;
 992
 993         if (sk->sk_state == IUCV_CLOSED)
 994                 mask |= POLLHUP;
 995
 996         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
 997                 mask |= POLLIN;
 998
 999         if (sock_writeable(sk))
1000                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1001         else
1002                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1003
1004         return mask;
1005 }
1006
1007 static int iucv_sock_shutdown(struct socket *sock, int how)
1008 {
1009         struct sock *sk = sock->sk;
1010         struct iucv_sock *iucv = iucv_sk(sk);
1011         struct iucv_message txmsg;
1012         int err = 0;
1013
1014         how++;
1015
1016         if ((how & ~SHUTDOWN_MASK) || !how)
1017                 return -EINVAL;
1018
1019         lock_sock(sk);
1020         switch (sk->sk_state) {
1021         case IUCV_CLOSED:
1022                 err = -ENOTCONN;
1023                 goto fail;
1024
1025         default:
1026                 sk->sk_shutdown |= how;
1027                 break;
1028         }
1029
1030         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1031                 txmsg.class = 0;
1032                 txmsg.tag = 0;
1033                 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
1034                                         (void *) iprm_shutdown, 8);
1035                 if (err) {
1036                         switch (err) {
1037                         case 1:
1038                                 err = -ENOTCONN;
1039                                 break;
1040                         case 2:
1041                                 err = -ECONNRESET;
1042                                 break;
1043                         default:
1044                                 err = -ENOTCONN;
1045                                 break;
1046                         }
1047                 }
1048         }
1049
1050         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1051                 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
1052                 if (err)
1053                         err = -ENOTCONN;
1054
1055                 skb_queue_purge(&sk->sk_receive_queue);
1056         }
1057
1058         /* Wake up anyone sleeping in poll */
1059         sk->sk_state_change(sk);
1060
1061 fail:
1062         release_sock(sk);
1063         return err;
1064 }
1065
1066 static int iucv_sock_release(struct socket *sock)
1067 {
1068         struct sock *sk = sock->sk;
1069         int err = 0;
1070
1071         if (!sk)
1072                 return 0;
1073
1074         iucv_sock_close(sk);
1075
1076         /* Unregister with IUCV base support */
1077         if (iucv_sk(sk)->path) {
1078                 iucv_path_sever(iucv_sk(sk)->path, NULL);
1079                 iucv_path_free(iucv_sk(sk)->path);
1080                 iucv_sk(sk)->path = NULL;
1081         }
1082
1083         sock_orphan(sk);
1084         iucv_sock_kill(sk);
1085         return err;
1086 }
1087
1088 /* getsockopt and setsockopt */
1089 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1090                                 char __user *optval, int optlen)
1091 {
1092         struct sock *sk = sock->sk;
1093         struct iucv_sock *iucv = iucv_sk(sk);
1094         int val;
1095         int rc;
1096
1097         if (level != SOL_IUCV)
1098                 return -ENOPROTOOPT;
1099
1100         if (optlen < sizeof(int))
1101                 return -EINVAL;
1102
1103         if (get_user(val, (int __user *) optval))
1104                 return -EFAULT;
1105
1106         rc = 0;
1107
1108         lock_sock(sk);
1109         switch (optname) {
1110         case SO_IPRMDATA_MSG:
1111                 if (val)
1112                         iucv->flags |= IUCV_IPRMDATA;
1113                 else
1114                         iucv->flags &= ~IUCV_IPRMDATA;
1115                 break;
1116         default:
1117                 rc = -ENOPROTOOPT;
1118                 break;
1119         }
1120         release_sock(sk);
1121
1122         return rc;
1123 }
1124
1125 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1126                                 char __user *optval, int __user *optlen)
1127 {
1128         struct sock *sk = sock->sk;
1129         struct iucv_sock *iucv = iucv_sk(sk);
1130         int val, len;
1131
1132         if (level != SOL_IUCV)
1133                 return -ENOPROTOOPT;
1134
1135         if (get_user(len, optlen))
1136                 return -EFAULT;
1137
1138         if (len < 0)
1139                 return -EINVAL;
1140
1141         len = min_t(unsigned int, len, sizeof(int));
1142
1143         switch (optname) {
1144         case SO_IPRMDATA_MSG:
1145                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1146                 break;
1147         default:
1148                 return -ENOPROTOOPT;
1149         }
1150
1151         if (put_user(len, optlen))
1152                 return -EFAULT;
1153         if (copy_to_user(optval, &val, len))
1154                 return -EFAULT;
1155
1156         return 0;
1157 }
1158
1159
1160 /* Callback wrappers - called from iucv base support */
1161 static int iucv_callback_connreq(struct iucv_path *path,
1162                                  u8 ipvmid[8], u8 ipuser[16])
1163 {
1164         unsigned char user_data[16];
1165         unsigned char nuser_data[16];
1166         unsigned char src_name[8];
1167         struct hlist_node *node;
1168         struct sock *sk, *nsk;
1169         struct iucv_sock *iucv, *niucv;
1170         int err;
1171
1172         memcpy(src_name, ipuser, 8);
1173         EBCASC(src_name, 8);
1174         /* Find out if this path belongs to af_iucv. */
1175         read_lock(&iucv_sk_list.lock);
1176         iucv = NULL;
1177         sk = NULL;
1178         sk_for_each(sk, node, &iucv_sk_list.head)
1179                 if (sk->sk_state == IUCV_LISTEN &&
1180                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1181                         /*
1182                          * Found a listening socket with
1183                          * src_name == ipuser[0-7].
1184                          */
1185                         iucv = iucv_sk(sk);
1186                         break;
1187                 }
1188         read_unlock(&iucv_sk_list.lock);
1189         if (!iucv)
1190                 /* No socket found, not one of our paths. */
1191                 return -EINVAL;
1192
1193         bh_lock_sock(sk);
1194
1195         /* Check if parent socket is listening */
1196         low_nmcpy(user_data, iucv->src_name);
1197         high_nmcpy(user_data, iucv->dst_name);
1198         ASCEBC(user_data, sizeof(user_data));
1199         if (sk->sk_state != IUCV_LISTEN) {
1200                 err = iucv_path_sever(path, user_data);
1201                 iucv_path_free(path);
1202                 goto fail;
1203         }
1204
1205         /* Check for backlog size */
1206         if (sk_acceptq_is_full(sk)) {
1207                 err = iucv_path_sever(path, user_data);
1208                 iucv_path_free(path);
1209                 goto fail;
1210         }
1211
1212         /* Create the new socket */
1213         nsk = iucv_sock_alloc(NULL, SOCK_STREAM, GFP_ATOMIC);
1214         if (!nsk) {
1215                 err = iucv_path_sever(path, user_data);
1216                 iucv_path_free(path);
1217                 goto fail;
1218         }
1219
1220         niucv = iucv_sk(nsk);
1221         iucv_sock_init(nsk, sk);
1222
1223         /* Set the new iucv_sock */
1224         memcpy(niucv->dst_name, ipuser + 8, 8);
1225         EBCASC(niucv->dst_name, 8);
1226         memcpy(niucv->dst_user_id, ipvmid, 8);
1227         memcpy(niucv->src_name, iucv->src_name, 8);
1228         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1229         niucv->path = path;
1230
1231         /* Call iucv_accept */
1232         high_nmcpy(nuser_data, ipuser + 8);
1233         memcpy(nuser_data + 8, niucv->src_name, 8);
1234         ASCEBC(nuser_data + 8, 8);
1235
1236         path->msglim = IUCV_QUEUELEN_DEFAULT;
1237         err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1238         if (err) {
1239                 err = iucv_path_sever(path, user_data);
1240                 iucv_path_free(path);
1241                 iucv_sock_kill(nsk);
1242                 goto fail;
1243         }
1244
1245         iucv_accept_enqueue(sk, nsk);
1246
1247         /* Wake up accept */
1248         nsk->sk_state = IUCV_CONNECTED;
1249         sk->sk_data_ready(sk, 1);
1250         err = 0;
1251 fail:
1252         bh_unlock_sock(sk);
1253         return 0;
1254 }
1255
1256 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1257 {
1258         struct sock *sk = path->private;
1259
1260         sk->sk_state = IUCV_CONNECTED;
1261         sk->sk_state_change(sk);
1262 }
1263
1264 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1265 {
1266         struct sock *sk = path->private;
1267         struct iucv_sock *iucv = iucv_sk(sk);
1268         struct sk_buff *skb;
1269         struct sock_msg_q *save_msg;
1270         int len;
1271
1272         if (sk->sk_shutdown & RCV_SHUTDOWN)
1273                 return;
1274
1275         if (!list_empty(&iucv->message_q.list) ||
1276             !skb_queue_empty(&iucv->backlog_skb_q))
1277                 goto save_message;
1278
1279         len = atomic_read(&sk->sk_rmem_alloc);
1280         len += iucv_msg_length(msg) + sizeof(struct sk_buff);
1281         if (len > sk->sk_rcvbuf)
1282                 goto save_message;
1283
1284         skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1285         if (!skb)
1286                 goto save_message;
1287
1288         spin_lock(&iucv->message_q.lock);
1289         iucv_process_message(sk, skb, path, msg);
1290         spin_unlock(&iucv->message_q.lock);
1291
1292         return;
1293
1294 save_message:
1295         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1296         if (!save_msg)
1297                 return;
1298         save_msg->path = path;
1299         save_msg->msg = *msg;
1300
1301         spin_lock(&iucv->message_q.lock);
1302         list_add_tail(&save_msg->list, &iucv->message_q.list);
1303         spin_unlock(&iucv->message_q.lock);
1304 }
1305
1306 static void iucv_callback_txdone(struct iucv_path *path,
1307                                  struct iucv_message *msg)
1308 {
1309         struct sock *sk = path->private;
1310         struct sk_buff *this = NULL;
1311         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1312         struct sk_buff *list_skb = list->next;
1313         unsigned long flags;
1314
1315         if (!skb_queue_empty(list)) {
1316                 spin_lock_irqsave(&list->lock, flags);
1317
1318                 while (list_skb != (struct sk_buff *)list) {
1319                         if (!memcmp(&msg->tag, list_skb->cb, 4)) {
1320                                 this = list_skb;
1321                                 break;
1322                         }
1323                         list_skb = list_skb->next;
1324                 }
1325                 if (this)
1326                         __skb_unlink(this, list);
1327
1328                 spin_unlock_irqrestore(&list->lock, flags);
1329
1330                 kfree_skb(this);
1331         }
1332         BUG_ON(!this);
1333
1334         if (sk->sk_state == IUCV_CLOSING) {
1335                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1336                         sk->sk_state = IUCV_CLOSED;
1337                         sk->sk_state_change(sk);
1338                 }
1339         }
1340
1341 }
1342
1343 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1344 {
1345         struct sock *sk = path->private;
1346
1347         if (!list_empty(&iucv_sk(sk)->accept_q))
1348                 sk->sk_state = IUCV_SEVERED;
1349         else
1350                 sk->sk_state = IUCV_DISCONN;
1351
1352         sk->sk_state_change(sk);
1353 }
1354
1355 /* called if the other communication side shuts down its RECV direction;
1356  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1357  */
1358 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1359 {
1360         struct sock *sk = path->private;
1361
1362         bh_lock_sock(sk);
1363         if (sk->sk_state != IUCV_CLOSED) {
1364                 sk->sk_shutdown |= SEND_SHUTDOWN;
1365                 sk->sk_state_change(sk);
1366         }
1367         bh_unlock_sock(sk);
1368 }
1369
1370 static struct proto_ops iucv_sock_ops = {
1371         .family         = PF_IUCV,
1372         .owner          = THIS_MODULE,
1373         .release        = iucv_sock_release,
1374         .bind           = iucv_sock_bind,
1375         .connect        = iucv_sock_connect,
1376         .listen         = iucv_sock_listen,
1377         .accept         = iucv_sock_accept,
1378         .getname        = iucv_sock_getname,
1379         .sendmsg        = iucv_sock_sendmsg,
1380         .recvmsg        = iucv_sock_recvmsg,
1381         .poll           = iucv_sock_poll,
1382         .ioctl          = sock_no_ioctl,
1383         .mmap           = sock_no_mmap,
1384         .socketpair     = sock_no_socketpair,
1385         .shutdown       = iucv_sock_shutdown,
1386         .setsockopt     = iucv_sock_setsockopt,
1387         .getsockopt     = iucv_sock_getsockopt,
1388 };
1389
1390 static struct net_proto_family iucv_sock_family_ops = {
1391         .family = AF_IUCV,
1392         .owner  = THIS_MODULE,
1393         .create = iucv_sock_create,
1394 };
1395
1396 static int __init afiucv_init(void)
1397 {
1398         int err;
1399
1400         if (!MACHINE_IS_VM) {
1401                 pr_err("The af_iucv module cannot be loaded"
1402                        " without z/VM\n");
1403                 err = -EPROTONOSUPPORT;
1404                 goto out;
1405         }
1406         cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1407         if (unlikely(err)) {
1408                 WARN_ON(err);
1409                 err = -EPROTONOSUPPORT;
1410                 goto out;
1411         }
1412
1413         err = iucv_register(&af_iucv_handler, 0);
1414         if (err)
1415                 goto out;
1416         err = proto_register(&iucv_proto, 0);
1417         if (err)
1418                 goto out_iucv;
1419         err = sock_register(&iucv_sock_family_ops);
1420         if (err)
1421                 goto out_proto;
1422         return 0;
1423
1424 out_proto:
1425         proto_unregister(&iucv_proto);
1426 out_iucv:
1427         iucv_unregister(&af_iucv_handler, 0);
1428 out:
1429         return err;
1430 }
1431
1432 static void __exit afiucv_exit(void)
1433 {
1434         sock_unregister(PF_IUCV);
1435         proto_unregister(&iucv_proto);
1436         iucv_unregister(&af_iucv_handler, 0);
1437 }
1438
1439 module_init(afiucv_init);
1440 module_exit(afiucv_exit);
1441
1442 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1443 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1444 MODULE_VERSION(VERSION);
1445 MODULE_LICENSE("GPL");
1446 MODULE_ALIAS_NETPROTO(PF_IUCV);