net/iucv/af_iucv.c

   1 /*
   2  *  IUCV protocol stack for Linux on zSeries
   3  *
   4  *  Copyright IBM Corp. 2006, 2009
   5  *
   6  *  Author(s):  Jennifer Hunt <[email protected]>
   7  *              Hendrik Brueckner <[email protected]>
   8  *  PM functions:
   9  *              Ursula Braun <[email protected]>
  10  */
  11
  12 #define KMSG_COMPONENT "af_iucv"
  13 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/list.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/slab.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/init.h>
  24 #include <linux/poll.h>
  25 #include <net/sock.h>
  26 #include <asm/ebcdic.h>
  27 #include <asm/cpcmd.h>
  28 #include <linux/kmod.h>
  29
  30 #include <net/iucv/iucv.h>
  31 #include <net/iucv/af_iucv.h>
  32
  33 #define VERSION "1.1"
  34
  35 static char iucv_userid[80];
  36
  37 static struct proto_ops iucv_sock_ops;
  38
  39 static struct proto iucv_proto = {
  40         .name           = "AF_IUCV",
  41         .owner          = THIS_MODULE,
  42         .obj_size       = sizeof(struct iucv_sock),
  43 };
  44
  45 /* special AF_IUCV IPRM messages */
  46 static const u8 iprm_shutdown[8] =
  47         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  48
  49 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
  50
  51 /* macros to set/get socket control buffer at correct offset */
  52 #define CB_TAG(skb)     ((skb)->cb)             /* iucv message tag */
  53 #define CB_TAG_LEN      (sizeof(((struct iucv_message *) 0)->tag))
  54 #define CB_TRGCLS(skb)  ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
  55 #define CB_TRGCLS_LEN   (TRGCLS_SIZE)
  56
  57
  58 static void iucv_sock_kill(struct sock *sk);
  59 static void iucv_sock_close(struct sock *sk);
  60
  61 /* Call Back functions */
  62 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  63 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  64 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
  65 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
  66                                  u8 ipuser[16]);
  67 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
  68 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
  69
  70 static struct iucv_sock_list iucv_sk_list = {
  71         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
  72         .autobind_name = ATOMIC_INIT(0)
  73 };
  74
  75 static struct iucv_handler af_iucv_handler = {
  76         .path_pending     = iucv_callback_connreq,
  77         .path_complete    = iucv_callback_connack,
  78         .path_severed     = iucv_callback_connrej,
  79         .message_pending  = iucv_callback_rx,
  80         .message_complete = iucv_callback_txdone,
  81         .path_quiesced    = iucv_callback_shutdown,
  82 };
  83
  84 static inline void high_nmcpy(unsigned char *dst, char *src)
  85 {
  86        memcpy(dst, src, 8);
  87 }
  88
  89 static inline void low_nmcpy(unsigned char *dst, char *src)
  90 {
  91        memcpy(&dst[8], src, 8);
  92 }
  93
  94 static int afiucv_pm_prepare(struct device *dev)
  95 {
  96 #ifdef CONFIG_PM_DEBUG
  97         printk(KERN_WARNING "afiucv_pm_prepare\n");
  98 #endif
  99         return 0;
 100 }
 101
 102 static void afiucv_pm_complete(struct device *dev)
 103 {
 104 #ifdef CONFIG_PM_DEBUG
 105         printk(KERN_WARNING "afiucv_pm_complete\n");
 106 #endif
 107         return;
 108 }
 109
 110 /**
 111  * afiucv_pm_freeze() - Freeze PM callback
 112  * @dev:        AFIUCV dummy device
 113  *
 114  * Sever all established IUCV communication pathes
 115  */
 116 static int afiucv_pm_freeze(struct device *dev)
 117 {
 118         struct iucv_sock *iucv;
 119         struct sock *sk;
 120         struct hlist_node *node;
 121         int err = 0;
 122
 123 #ifdef CONFIG_PM_DEBUG
 124         printk(KERN_WARNING "afiucv_pm_freeze\n");
 125 #endif
 126         read_lock(&iucv_sk_list.lock);
 127         sk_for_each(sk, node, &iucv_sk_list.head) {
 128                 iucv = iucv_sk(sk);
 129                 skb_queue_purge(&iucv->send_skb_q);
 130                 skb_queue_purge(&iucv->backlog_skb_q);
 131                 switch (sk->sk_state) {
 132                 case IUCV_SEVERED:
 133                 case IUCV_DISCONN:
 134                 case IUCV_CLOSING:
 135                 case IUCV_CONNECTED:
 136                         if (iucv->path) {
 137                                 err = iucv_path_sever(iucv->path, NULL);
 138                                 iucv_path_free(iucv->path);
 139                                 iucv->path = NULL;
 140                         }
 141                         break;
 142                 case IUCV_OPEN:
 143                 case IUCV_BOUND:
 144                 case IUCV_LISTEN:
 145                 case IUCV_CLOSED:
 146                 default:
 147                         break;
 148                 }
 149         }
 150         read_unlock(&iucv_sk_list.lock);
 151         return err;
 152 }
 153
 154 /**
 155  * afiucv_pm_restore_thaw() - Thaw and restore PM callback
 156  * @dev:        AFIUCV dummy device
 157  *
 158  * socket clean up after freeze
 159  */
 160 static int afiucv_pm_restore_thaw(struct device *dev)
 161 {
 162         struct iucv_sock *iucv;
 163         struct sock *sk;
 164         struct hlist_node *node;
 165
 166 #ifdef CONFIG_PM_DEBUG
 167         printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
 168 #endif
 169         read_lock(&iucv_sk_list.lock);
 170         sk_for_each(sk, node, &iucv_sk_list.head) {
 171                 iucv = iucv_sk(sk);
 172                 switch (sk->sk_state) {
 173                 case IUCV_CONNECTED:
 174                         sk->sk_err = EPIPE;
 175                         sk->sk_state = IUCV_DISCONN;
 176                         sk->sk_state_change(sk);
 177                         break;
 178                 case IUCV_DISCONN:
 179                 case IUCV_SEVERED:
 180                 case IUCV_CLOSING:
 181                 case IUCV_LISTEN:
 182                 case IUCV_BOUND:
 183                 case IUCV_OPEN:
 184                 default:
 185                         break;
 186                 }
 187         }
 188         read_unlock(&iucv_sk_list.lock);
 189         return 0;
 190 }
 191
 192 static struct dev_pm_ops afiucv_pm_ops = {
 193         .prepare = afiucv_pm_prepare,
 194         .complete = afiucv_pm_complete,
 195         .freeze = afiucv_pm_freeze,
 196         .thaw = afiucv_pm_restore_thaw,
 197         .restore = afiucv_pm_restore_thaw,
 198 };
 199
 200 static struct device_driver af_iucv_driver = {
 201         .owner = THIS_MODULE,
 202         .name = "afiucv",
 203         .bus  = &iucv_bus,
 204         .pm   = &afiucv_pm_ops,
 205 };
 206
 207 /* dummy device used as trigger for PM functions */
 208 static struct device *af_iucv_dev;
 209
 210 /**
 211  * iucv_msg_length() - Returns the length of an iucv message.
 212  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
 213  *
 214  * The function returns the length of the specified iucv message @msg of data
 215  * stored in a buffer and of data stored in the parameter list (PRMDATA).
 216  *
 217  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 218  * data:
 219  *      PRMDATA[0..6]   socket data (max 7 bytes);
 220  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
 221  *
 222  * The socket data length is computed by substracting the socket data length
 223  * value from 0xFF.
 224  * If the socket data len is greater 7, then PRMDATA can be used for special
 225  * notifications (see iucv_sock_shutdown); and further,
 226  * if the socket data len is > 7, the function returns 8.
 227  *
 228  * Use this function to allocate socket buffers to store iucv message data.
 229  */
 230 static inline size_t iucv_msg_length(struct iucv_message *msg)
 231 {
 232         size_t datalen;
 233
 234         if (msg->flags & IUCV_IPRMDATA) {
 235                 datalen = 0xff - msg->rmmsg[7];
 236                 return (datalen < 8) ? datalen : 8;
 237         }
 238         return msg->length;
 239 }
 240
 241 /* Timers */
 242 static void iucv_sock_timeout(unsigned long arg)
 243 {
 244         struct sock *sk = (struct sock *)arg;
 245
 246         bh_lock_sock(sk);
 247         sk->sk_err = ETIMEDOUT;
 248         sk->sk_state_change(sk);
 249         bh_unlock_sock(sk);
 250
 251         iucv_sock_kill(sk);
 252         sock_put(sk);
 253 }
 254
 255 static void iucv_sock_clear_timer(struct sock *sk)
 256 {
 257         sk_stop_timer(sk, &sk->sk_timer);
 258 }
 259
 260 static struct sock *__iucv_get_sock_by_name(char *nm)
 261 {
 262         struct sock *sk;
 263         struct hlist_node *node;
 264
 265         sk_for_each(sk, node, &iucv_sk_list.head)
 266                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 267                         return sk;
 268
 269         return NULL;
 270 }
 271
 272 static void iucv_sock_destruct(struct sock *sk)
 273 {
 274         skb_queue_purge(&sk->sk_receive_queue);
 275         skb_queue_purge(&sk->sk_write_queue);
 276 }
 277
 278 /* Cleanup Listen */
 279 static void iucv_sock_cleanup_listen(struct sock *parent)
 280 {
 281         struct sock *sk;
 282
 283         /* Close non-accepted connections */
 284         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 285                 iucv_sock_close(sk);
 286                 iucv_sock_kill(sk);
 287         }
 288
 289         parent->sk_state = IUCV_CLOSED;
 290         sock_set_flag(parent, SOCK_ZAPPED);
 291 }
 292
 293 /* Kill socket */
 294 static void iucv_sock_kill(struct sock *sk)
 295 {
 296         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 297                 return;
 298
 299         iucv_sock_unlink(&iucv_sk_list, sk);
 300         sock_set_flag(sk, SOCK_DEAD);
 301         sock_put(sk);
 302 }
 303
 304 /* Close an IUCV socket */
 305 static void iucv_sock_close(struct sock *sk)
 306 {
 307         unsigned char user_data[16];
 308         struct iucv_sock *iucv = iucv_sk(sk);
 309         int err;
 310         unsigned long timeo;
 311
 312         iucv_sock_clear_timer(sk);
 313         lock_sock(sk);
 314
 315         switch (sk->sk_state) {
 316         case IUCV_LISTEN:
 317                 iucv_sock_cleanup_listen(sk);
 318                 break;
 319
 320         case IUCV_CONNECTED:
 321         case IUCV_DISCONN:
 322                 err = 0;
 323
 324                 sk->sk_state = IUCV_CLOSING;
 325                 sk->sk_state_change(sk);
 326
 327                 if (!skb_queue_empty(&iucv->send_skb_q)) {
 328                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 329                                 timeo = sk->sk_lingertime;
 330                         else
 331                                 timeo = IUCV_DISCONN_TIMEOUT;
 332                         err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
 333                 }
 334
 335         case IUCV_CLOSING:   /* fall through */
 336                 sk->sk_state = IUCV_CLOSED;
 337                 sk->sk_state_change(sk);
 338
 339                 if (iucv->path) {
 340                         low_nmcpy(user_data, iucv->src_name);
 341                         high_nmcpy(user_data, iucv->dst_name);
 342                         ASCEBC(user_data, sizeof(user_data));
 343                         err = iucv_path_sever(iucv->path, user_data);
 344                         iucv_path_free(iucv->path);
 345                         iucv->path = NULL;
 346                 }
 347
 348                 sk->sk_err = ECONNRESET;
 349                 sk->sk_state_change(sk);
 350
 351                 skb_queue_purge(&iucv->send_skb_q);
 352                 skb_queue_purge(&iucv->backlog_skb_q);
 353
 354                 sock_set_flag(sk, SOCK_ZAPPED);
 355                 break;
 356
 357         default:
 358                 sock_set_flag(sk, SOCK_ZAPPED);
 359                 break;
 360         }
 361
 362         release_sock(sk);
 363         iucv_sock_kill(sk);
 364 }
 365
 366 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 367 {
 368         if (parent)
 369                 sk->sk_type = parent->sk_type;
 370 }
 371
 372 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 373 {
 374         struct sock *sk;
 375
 376         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
 377         if (!sk)
 378                 return NULL;
 379
 380         sock_init_data(sock, sk);
 381         INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
 382         spin_lock_init(&iucv_sk(sk)->accept_q_lock);
 383         skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
 384         INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
 385         spin_lock_init(&iucv_sk(sk)->message_q.lock);
 386         skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
 387         iucv_sk(sk)->send_tag = 0;
 388         iucv_sk(sk)->flags = 0;
 389         iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT;
 390         iucv_sk(sk)->path = NULL;
 391         memset(&iucv_sk(sk)->src_user_id , 0, 32);
 392
 393         sk->sk_destruct = iucv_sock_destruct;
 394         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 395         sk->sk_allocation = GFP_DMA;
 396
 397         sock_reset_flag(sk, SOCK_ZAPPED);
 398
 399         sk->sk_protocol = proto;
 400         sk->sk_state    = IUCV_OPEN;
 401
 402         setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
 403
 404         iucv_sock_link(&iucv_sk_list, sk);
 405         return sk;
 406 }
 407
 408 /* Create an IUCV socket */
 409 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol)
 410 {
 411         struct sock *sk;
 412
 413         if (protocol && protocol != PF_IUCV)
 414                 return -EPROTONOSUPPORT;
 415
 416         sock->state = SS_UNCONNECTED;
 417
 418         switch (sock->type) {
 419         case SOCK_STREAM:
 420                 sock->ops = &iucv_sock_ops;
 421                 break;
 422         case SOCK_SEQPACKET:
 423                 /* currently, proto ops can handle both sk types */
 424                 sock->ops = &iucv_sock_ops;
 425                 break;
 426         default:
 427                 return -ESOCKTNOSUPPORT;
 428         }
 429
 430         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
 431         if (!sk)
 432                 return -ENOMEM;
 433
 434         iucv_sock_init(sk, NULL);
 435
 436         return 0;
 437 }
 438
 439 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 440 {
 441         write_lock_bh(&l->lock);
 442         sk_add_node(sk, &l->head);
 443         write_unlock_bh(&l->lock);
 444 }
 445
 446 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 447 {
 448         write_lock_bh(&l->lock);
 449         sk_del_node_init(sk);
 450         write_unlock_bh(&l->lock);
 451 }
 452
 453 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 454 {
 455         unsigned long flags;
 456         struct iucv_sock *par = iucv_sk(parent);
 457
 458         sock_hold(sk);
 459         spin_lock_irqsave(&par->accept_q_lock, flags);
 460         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 461         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 462         iucv_sk(sk)->parent = parent;
 463         parent->sk_ack_backlog++;
 464 }
 465
 466 void iucv_accept_unlink(struct sock *sk)
 467 {
 468         unsigned long flags;
 469         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 470
 471         spin_lock_irqsave(&par->accept_q_lock, flags);
 472         list_del_init(&iucv_sk(sk)->accept_q);
 473         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 474         iucv_sk(sk)->parent->sk_ack_backlog--;
 475         iucv_sk(sk)->parent = NULL;
 476         sock_put(sk);
 477 }
 478
 479 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 480 {
 481         struct iucv_sock *isk, *n;
 482         struct sock *sk;
 483
 484         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 485                 sk = (struct sock *) isk;
 486                 lock_sock(sk);
 487
 488                 if (sk->sk_state == IUCV_CLOSED) {
 489                         iucv_accept_unlink(sk);
 490                         release_sock(sk);
 491                         continue;
 492                 }
 493
 494                 if (sk->sk_state == IUCV_CONNECTED ||
 495                     sk->sk_state == IUCV_SEVERED ||
 496                     !newsock) {
 497                         iucv_accept_unlink(sk);
 498                         if (newsock)
 499                                 sock_graft(sk, newsock);
 500
 501                         if (sk->sk_state == IUCV_SEVERED)
 502                                 sk->sk_state = IUCV_DISCONN;
 503
 504                         release_sock(sk);
 505                         return sk;
 506                 }
 507
 508                 release_sock(sk);
 509         }
 510         return NULL;
 511 }
 512
 513 int iucv_sock_wait_state(struct sock *sk, int state, int state2,
 514                          unsigned long timeo)
 515 {
 516         DECLARE_WAITQUEUE(wait, current);
 517         int err = 0;
 518
 519         add_wait_queue(sk->sk_sleep, &wait);
 520         while (sk->sk_state != state && sk->sk_state != state2) {
 521                 set_current_state(TASK_INTERRUPTIBLE);
 522
 523                 if (!timeo) {
 524                         err = -EAGAIN;
 525                         break;
 526                 }
 527
 528                 if (signal_pending(current)) {
 529                         err = sock_intr_errno(timeo);
 530                         break;
 531                 }
 532
 533                 release_sock(sk);
 534                 timeo = schedule_timeout(timeo);
 535                 lock_sock(sk);
 536
 537                 err = sock_error(sk);
 538                 if (err)
 539                         break;
 540         }
 541         set_current_state(TASK_RUNNING);
 542         remove_wait_queue(sk->sk_sleep, &wait);
 543         return err;
 544 }
 545
 546 /* Bind an unbound socket */
 547 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 548                           int addr_len)
 549 {
 550         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 551         struct sock *sk = sock->sk;
 552         struct iucv_sock *iucv;
 553         int err;
 554
 555         /* Verify the input sockaddr */
 556         if (!addr || addr->sa_family != AF_IUCV)
 557                 return -EINVAL;
 558
 559         lock_sock(sk);
 560         if (sk->sk_state != IUCV_OPEN) {
 561                 err = -EBADFD;
 562                 goto done;
 563         }
 564
 565         write_lock_bh(&iucv_sk_list.lock);
 566
 567         iucv = iucv_sk(sk);
 568         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 569                 err = -EADDRINUSE;
 570                 goto done_unlock;
 571         }
 572         if (iucv->path) {
 573                 err = 0;
 574                 goto done_unlock;
 575         }
 576
 577         /* Bind the socket */
 578         memcpy(iucv->src_name, sa->siucv_name, 8);
 579
 580         /* Copy the user id */
 581         memcpy(iucv->src_user_id, iucv_userid, 8);
 582         sk->sk_state = IUCV_BOUND;
 583         err = 0;
 584
 585 done_unlock:
 586         /* Release the socket list lock */
 587         write_unlock_bh(&iucv_sk_list.lock);
 588 done:
 589         release_sock(sk);
 590         return err;
 591 }
 592
 593 /* Automatically bind an unbound socket */
 594 static int iucv_sock_autobind(struct sock *sk)
 595 {
 596         struct iucv_sock *iucv = iucv_sk(sk);
 597         char query_buffer[80];
 598         char name[12];
 599         int err = 0;
 600
 601         /* Set the userid and name */
 602         cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
 603         if (unlikely(err))
 604                 return -EPROTO;
 605
 606         memcpy(iucv->src_user_id, query_buffer, 8);
 607
 608         write_lock_bh(&iucv_sk_list.lock);
 609
 610         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 611         while (__iucv_get_sock_by_name(name)) {
 612                 sprintf(name, "%08x",
 613                         atomic_inc_return(&iucv_sk_list.autobind_name));
 614         }
 615
 616         write_unlock_bh(&iucv_sk_list.lock);
 617
 618         memcpy(&iucv->src_name, name, 8);
 619
 620         return err;
 621 }
 622
 623 /* Connect an unconnected socket */
 624 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 625                              int alen, int flags)
 626 {
 627         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 628         struct sock *sk = sock->sk;
 629         struct iucv_sock *iucv;
 630         unsigned char user_data[16];
 631         int err;
 632
 633         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 634                 return -EINVAL;
 635
 636         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 637                 return -EBADFD;
 638
 639         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 640                 return -EINVAL;
 641
 642         if (sk->sk_state == IUCV_OPEN) {
 643                 err = iucv_sock_autobind(sk);
 644                 if (unlikely(err))
 645                         return err;
 646         }
 647
 648         lock_sock(sk);
 649
 650         /* Set the destination information */
 651         memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
 652         memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
 653
 654         high_nmcpy(user_data, sa->siucv_name);
 655         low_nmcpy(user_data, iucv_sk(sk)->src_name);
 656         ASCEBC(user_data, sizeof(user_data));
 657
 658         iucv = iucv_sk(sk);
 659         /* Create path. */
 660         iucv->path = iucv_path_alloc(iucv->msglimit,
 661                                      IUCV_IPRMDATA, GFP_KERNEL);
 662         if (!iucv->path) {
 663                 err = -ENOMEM;
 664                 goto done;
 665         }
 666         err = iucv_path_connect(iucv->path, &af_iucv_handler,
 667                                 sa->siucv_user_id, NULL, user_data, sk);
 668         if (err) {
 669                 iucv_path_free(iucv->path);
 670                 iucv->path = NULL;
 671                 switch (err) {
 672                 case 0x0b:      /* Target communicator is not logged on */
 673                         err = -ENETUNREACH;
 674                         break;
 675                 case 0x0d:      /* Max connections for this guest exceeded */
 676                 case 0x0e:      /* Max connections for target guest exceeded */
 677                         err = -EAGAIN;
 678                         break;
 679                 case 0x0f:      /* Missing IUCV authorization */
 680                         err = -EACCES;
 681                         break;
 682                 default:
 683                         err = -ECONNREFUSED;
 684                         break;
 685                 }
 686                 goto done;
 687         }
 688
 689         if (sk->sk_state != IUCV_CONNECTED) {
 690                 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
 691                                 sock_sndtimeo(sk, flags & O_NONBLOCK));
 692         }
 693
 694         if (sk->sk_state == IUCV_DISCONN) {
 695                 err = -ECONNREFUSED;
 696         }
 697
 698         if (err) {
 699                 iucv_path_sever(iucv->path, NULL);
 700                 iucv_path_free(iucv->path);
 701                 iucv->path = NULL;
 702         }
 703
 704 done:
 705         release_sock(sk);
 706         return err;
 707 }
 708
 709 /* Move a socket into listening state. */
 710 static int iucv_sock_listen(struct socket *sock, int backlog)
 711 {
 712         struct sock *sk = sock->sk;
 713         int err;
 714
 715         lock_sock(sk);
 716
 717         err = -EINVAL;
 718         if (sk->sk_state != IUCV_BOUND)
 719                 goto done;
 720
 721         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 722                 goto done;
 723
 724         sk->sk_max_ack_backlog = backlog;
 725         sk->sk_ack_backlog = 0;
 726         sk->sk_state = IUCV_LISTEN;
 727         err = 0;
 728
 729 done:
 730         release_sock(sk);
 731         return err;
 732 }
 733
 734 /* Accept a pending connection */
 735 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 736                             int flags)
 737 {
 738         DECLARE_WAITQUEUE(wait, current);
 739         struct sock *sk = sock->sk, *nsk;
 740         long timeo;
 741         int err = 0;
 742
 743         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 744
 745         if (sk->sk_state != IUCV_LISTEN) {
 746                 err = -EBADFD;
 747                 goto done;
 748         }
 749
 750         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 751
 752         /* Wait for an incoming connection */
 753         add_wait_queue_exclusive(sk->sk_sleep, &wait);
 754         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 755                 set_current_state(TASK_INTERRUPTIBLE);
 756                 if (!timeo) {
 757                         err = -EAGAIN;
 758                         break;
 759                 }
 760
 761                 release_sock(sk);
 762                 timeo = schedule_timeout(timeo);
 763                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 764
 765                 if (sk->sk_state != IUCV_LISTEN) {
 766                         err = -EBADFD;
 767                         break;
 768                 }
 769
 770                 if (signal_pending(current)) {
 771                         err = sock_intr_errno(timeo);
 772                         break;
 773                 }
 774         }
 775
 776         set_current_state(TASK_RUNNING);
 777         remove_wait_queue(sk->sk_sleep, &wait);
 778
 779         if (err)
 780                 goto done;
 781
 782         newsock->state = SS_CONNECTED;
 783
 784 done:
 785         release_sock(sk);
 786         return err;
 787 }
 788
 789 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 790                              int *len, int peer)
 791 {
 792         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 793         struct sock *sk = sock->sk;
 794
 795         addr->sa_family = AF_IUCV;
 796         *len = sizeof(struct sockaddr_iucv);
 797
 798         if (peer) {
 799                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
 800                 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
 801         } else {
 802                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
 803                 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
 804         }
 805         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 806         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
 807         memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
 808
 809         return 0;
 810 }
 811
 812 /**
 813  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
 814  * @path:       IUCV path
 815  * @msg:        Pointer to a struct iucv_message
 816  * @skb:        The socket data to send, skb->len MUST BE <= 7
 817  *
 818  * Send the socket data in the parameter list in the iucv message
 819  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
 820  * list and the socket data len at index 7 (last byte).
 821  * See also iucv_msg_length().
 822  *
 823  * Returns the error code from the iucv_message_send() call.
 824  */
 825 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
 826                           struct sk_buff *skb)
 827 {
 828         u8 prmdata[8];
 829
 830         memcpy(prmdata, (void *) skb->data, skb->len);
 831         prmdata[7] = 0xff - (u8) skb->len;
 832         return iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
 833                                  (void *) prmdata, 8);
 834 }
 835
 836 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 837                              struct msghdr *msg, size_t len)
 838 {
 839         struct sock *sk = sock->sk;
 840         struct iucv_sock *iucv = iucv_sk(sk);
 841         struct sk_buff *skb;
 842         struct iucv_message txmsg;
 843         struct cmsghdr *cmsg;
 844         int cmsg_done;
 845         char user_id[9];
 846         char appl_id[9];
 847         int err;
 848
 849         err = sock_error(sk);
 850         if (err)
 851                 return err;
 852
 853         if (msg->msg_flags & MSG_OOB)
 854                 return -EOPNOTSUPP;
 855
 856         /* SOCK_SEQPACKET: we do not support segmented records */
 857         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
 858                 return -EOPNOTSUPP;
 859
 860         lock_sock(sk);
 861
 862         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 863                 err = -EPIPE;
 864                 goto out;
 865         }
 866
 867         if (sk->sk_state == IUCV_CONNECTED) {
 868                 /* initialize defaults */
 869                 cmsg_done   = 0;        /* check for duplicate headers */
 870                 txmsg.class = 0;
 871
 872                 /* iterate over control messages */
 873                 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
 874                      cmsg = CMSG_NXTHDR(msg, cmsg)) {
 875
 876                         if (!CMSG_OK(msg, cmsg)) {
 877                                 err = -EINVAL;
 878                                 goto out;
 879                         }
 880
 881                         if (cmsg->cmsg_level != SOL_IUCV)
 882                                 continue;
 883
 884                         if (cmsg->cmsg_type & cmsg_done) {
 885                                 err = -EINVAL;
 886                                 goto out;
 887                         }
 888                         cmsg_done |= cmsg->cmsg_type;
 889
 890                         switch (cmsg->cmsg_type) {
 891                         case SCM_IUCV_TRGCLS:
 892                                 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
 893                                         err = -EINVAL;
 894                                         goto out;
 895                                 }
 896
 897                                 /* set iucv message target class */
 898                                 memcpy(&txmsg.class,
 899                                         (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
 900
 901                                 break;
 902
 903                         default:
 904                                 err = -EINVAL;
 905                                 goto out;
 906                                 break;
 907                         }
 908                 }
 909
 910                 /* allocate one skb for each iucv message:
 911                  * this is fine for SOCK_SEQPACKET (unless we want to support
 912                  * segmented records using the MSG_EOR flag), but
 913                  * for SOCK_STREAM we might want to improve it in future */
 914                 if (!(skb = sock_alloc_send_skb(sk, len,
 915                                                 msg->msg_flags & MSG_DONTWAIT,
 916                                                 &err)))
 917                         goto out;
 918
 919                 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 920                         err = -EFAULT;
 921                         goto fail;
 922                 }
 923
 924                 /* increment and save iucv message tag for msg_completion cbk */
 925                 txmsg.tag = iucv->send_tag++;
 926                 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
 927                 skb_queue_tail(&iucv->send_skb_q, skb);
 928
 929                 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
 930                     && skb->len <= 7) {
 931                         err = iucv_send_iprm(iucv->path, &txmsg, skb);
 932
 933                         /* on success: there is no message_complete callback
 934                          * for an IPRMDATA msg; remove skb from send queue */
 935                         if (err == 0) {
 936                                 skb_unlink(skb, &iucv->send_skb_q);
 937                                 kfree_skb(skb);
 938                         }
 939
 940                         /* this error should never happen since the
 941                          * IUCV_IPRMDATA path flag is set... sever path */
 942                         if (err == 0x15) {
 943                                 iucv_path_sever(iucv->path, NULL);
 944                                 skb_unlink(skb, &iucv->send_skb_q);
 945                                 err = -EPIPE;
 946                                 goto fail;
 947                         }
 948                 } else
 949                         err = iucv_message_send(iucv->path, &txmsg, 0, 0,
 950                                                 (void *) skb->data, skb->len);
 951                 if (err) {
 952                         if (err == 3) {
 953                                 user_id[8] = 0;
 954                                 memcpy(user_id, iucv->dst_user_id, 8);
 955                                 appl_id[8] = 0;
 956                                 memcpy(appl_id, iucv->dst_name, 8);
 957                                 pr_err("Application %s on z/VM guest %s"
 958                                        " exceeds message limit\n",
 959                                        user_id, appl_id);
 960                         }
 961                         skb_unlink(skb, &iucv->send_skb_q);
 962                         err = -EPIPE;
 963                         goto fail;
 964                 }
 965
 966         } else {
 967                 err = -ENOTCONN;
 968                 goto out;
 969         }
 970
 971         release_sock(sk);
 972         return len;
 973
 974 fail:
 975         kfree_skb(skb);
 976 out:
 977         release_sock(sk);
 978         return err;
 979 }
 980
 981 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
 982 {
 983         int dataleft, size, copied = 0;
 984         struct sk_buff *nskb;
 985
 986         dataleft = len;
 987         while (dataleft) {
 988                 if (dataleft >= sk->sk_rcvbuf / 4)
 989                         size = sk->sk_rcvbuf / 4;
 990                 else
 991                         size = dataleft;
 992
 993                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
 994                 if (!nskb)
 995                         return -ENOMEM;
 996
 997                 /* copy target class to control buffer of new skb */
 998                 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
 999
1000                 /* copy data fragment */
1001                 memcpy(nskb->data, skb->data + copied, size);
1002                 copied += size;
1003                 dataleft -= size;
1004
1005                 skb_reset_transport_header(nskb);
1006                 skb_reset_network_header(nskb);
1007                 nskb->len = size;
1008
1009                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1010         }
1011
1012         return 0;
1013 }
1014
1015 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1016                                  struct iucv_path *path,
1017                                  struct iucv_message *msg)
1018 {
1019         int rc;
1020         unsigned int len;
1021
1022         len = iucv_msg_length(msg);
1023
1024         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1025         /* Note: the first 4 bytes are reserved for msg tag */
1026         memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1027
1028         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1029         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1030                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1031                         skb->data = NULL;
1032                         skb->len = 0;
1033                 }
1034         } else {
1035                 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
1036                                           skb->data, len, NULL);
1037                 if (rc) {
1038                         kfree_skb(skb);
1039                         return;
1040                 }
1041                 /* we need to fragment iucv messages for SOCK_STREAM only;
1042                  * for SOCK_SEQPACKET, it is only relevant if we support
1043                  * record segmentation using MSG_EOR (see also recvmsg()) */
1044                 if (sk->sk_type == SOCK_STREAM &&
1045                     skb->truesize >= sk->sk_rcvbuf / 4) {
1046                         rc = iucv_fragment_skb(sk, skb, len);
1047                         kfree_skb(skb);
1048                         skb = NULL;
1049                         if (rc) {
1050                                 iucv_path_sever(path, NULL);
1051                                 return;
1052                         }
1053                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1054                 } else {
1055                         skb_reset_transport_header(skb);
1056                         skb_reset_network_header(skb);
1057                         skb->len = len;
1058                 }
1059         }
1060
1061         if (sock_queue_rcv_skb(sk, skb))
1062                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1063 }
1064
1065 static void iucv_process_message_q(struct sock *sk)
1066 {
1067         struct iucv_sock *iucv = iucv_sk(sk);
1068         struct sk_buff *skb;
1069         struct sock_msg_q *p, *n;
1070
1071         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1072                 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1073                 if (!skb)
1074                         break;
1075                 iucv_process_message(sk, skb, p->path, &p->msg);
1076                 list_del(&p->list);
1077                 kfree(p);
1078                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1079                         break;
1080         }
1081 }
1082
1083 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1084                              struct msghdr *msg, size_t len, int flags)
1085 {
1086         int noblock = flags & MSG_DONTWAIT;
1087         struct sock *sk = sock->sk;
1088         struct iucv_sock *iucv = iucv_sk(sk);
1089         unsigned int copied, rlen;
1090         struct sk_buff *skb, *rskb, *cskb;
1091         int err = 0;
1092
1093         if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
1094             skb_queue_empty(&iucv->backlog_skb_q) &&
1095             skb_queue_empty(&sk->sk_receive_queue) &&
1096             list_empty(&iucv->message_q.list))
1097                 return 0;
1098
1099         if (flags & (MSG_OOB))
1100                 return -EOPNOTSUPP;
1101
1102         /* receive/dequeue next skb:
1103          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1104         skb = skb_recv_datagram(sk, flags, noblock, &err);
1105         if (!skb) {
1106                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1107                         return 0;
1108                 return err;
1109         }
1110
1111         rlen   = skb->len;              /* real length of skb */
1112         copied = min_t(unsigned int, rlen, len);
1113
1114         cskb = skb;
1115         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
1116                 if (!(flags & MSG_PEEK))
1117                         skb_queue_head(&sk->sk_receive_queue, skb);
1118                 return -EFAULT;
1119         }
1120
1121         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1122         if (sk->sk_type == SOCK_SEQPACKET) {
1123                 if (copied < rlen)
1124                         msg->msg_flags |= MSG_TRUNC;
1125                 /* each iucv message contains a complete record */
1126                 msg->msg_flags |= MSG_EOR;
1127         }
1128
1129         /* create control message to store iucv msg target class:
1130          * get the trgcls from the control buffer of the skb due to
1131          * fragmentation of original iucv message. */
1132         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1133                         CB_TRGCLS_LEN, CB_TRGCLS(skb));
1134         if (err) {
1135                 if (!(flags & MSG_PEEK))
1136                         skb_queue_head(&sk->sk_receive_queue, skb);
1137                 return err;
1138         }
1139
1140         /* Mark read part of skb as used */
1141         if (!(flags & MSG_PEEK)) {
1142
1143                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1144                 if (sk->sk_type == SOCK_STREAM) {
1145                         skb_pull(skb, copied);
1146                         if (skb->len) {
1147                                 skb_queue_head(&sk->sk_receive_queue, skb);
1148                                 goto done;
1149                         }
1150                 }
1151
1152                 kfree_skb(skb);
1153
1154                 /* Queue backlog skbs */
1155                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1156                 while (rskb) {
1157                         if (sock_queue_rcv_skb(sk, rskb)) {
1158                                 skb_queue_head(&iucv->backlog_skb_q,
1159                                                 rskb);
1160                                 break;
1161                         } else {
1162                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1163                         }
1164                 }
1165                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1166                         spin_lock_bh(&iucv->message_q.lock);
1167                         if (!list_empty(&iucv->message_q.list))
1168                                 iucv_process_message_q(sk);
1169                         spin_unlock_bh(&iucv->message_q.lock);
1170                 }
1171         }
1172
1173 done:
1174         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1175         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1176                 copied = rlen;
1177
1178         return copied;
1179 }
1180
1181 static inline unsigned int iucv_accept_poll(struct sock *parent)
1182 {
1183         struct iucv_sock *isk, *n;
1184         struct sock *sk;
1185
1186         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1187                 sk = (struct sock *) isk;
1188
1189                 if (sk->sk_state == IUCV_CONNECTED)
1190                         return POLLIN | POLLRDNORM;
1191         }
1192
1193         return 0;
1194 }
1195
1196 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1197                             poll_table *wait)
1198 {
1199         struct sock *sk = sock->sk;
1200         unsigned int mask = 0;
1201
1202         poll_wait(file, sk->sk_sleep, wait);
1203
1204         if (sk->sk_state == IUCV_LISTEN)
1205                 return iucv_accept_poll(sk);
1206
1207         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1208                 mask |= POLLERR;
1209
1210         if (sk->sk_shutdown & RCV_SHUTDOWN)
1211                 mask |= POLLRDHUP;
1212
1213         if (sk->sk_shutdown == SHUTDOWN_MASK)
1214                 mask |= POLLHUP;
1215
1216         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1217             (sk->sk_shutdown & RCV_SHUTDOWN))
1218                 mask |= POLLIN | POLLRDNORM;
1219
1220         if (sk->sk_state == IUCV_CLOSED)
1221                 mask |= POLLHUP;
1222
1223         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
1224                 mask |= POLLIN;
1225
1226         if (sock_writeable(sk))
1227                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1228         else
1229                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1230
1231         return mask;
1232 }
1233
1234 static int iucv_sock_shutdown(struct socket *sock, int how)
1235 {
1236         struct sock *sk = sock->sk;
1237         struct iucv_sock *iucv = iucv_sk(sk);
1238         struct iucv_message txmsg;
1239         int err = 0;
1240
1241         how++;
1242
1243         if ((how & ~SHUTDOWN_MASK) || !how)
1244                 return -EINVAL;
1245
1246         lock_sock(sk);
1247         switch (sk->sk_state) {
1248         case IUCV_DISCONN:
1249         case IUCV_CLOSING:
1250         case IUCV_SEVERED:
1251         case IUCV_CLOSED:
1252                 err = -ENOTCONN;
1253                 goto fail;
1254
1255         default:
1256                 sk->sk_shutdown |= how;
1257                 break;
1258         }
1259
1260         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1261                 txmsg.class = 0;
1262                 txmsg.tag = 0;
1263                 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
1264                                         (void *) iprm_shutdown, 8);
1265                 if (err) {
1266                         switch (err) {
1267                         case 1:
1268                                 err = -ENOTCONN;
1269                                 break;
1270                         case 2:
1271                                 err = -ECONNRESET;
1272                                 break;
1273                         default:
1274                                 err = -ENOTCONN;
1275                                 break;
1276                         }
1277                 }
1278         }
1279
1280         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1281                 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
1282                 if (err)
1283                         err = -ENOTCONN;
1284
1285                 skb_queue_purge(&sk->sk_receive_queue);
1286         }
1287
1288         /* Wake up anyone sleeping in poll */
1289         sk->sk_state_change(sk);
1290
1291 fail:
1292         release_sock(sk);
1293         return err;
1294 }
1295
1296 static int iucv_sock_release(struct socket *sock)
1297 {
1298         struct sock *sk = sock->sk;
1299         int err = 0;
1300
1301         if (!sk)
1302                 return 0;
1303
1304         iucv_sock_close(sk);
1305
1306         /* Unregister with IUCV base support */
1307         if (iucv_sk(sk)->path) {
1308                 iucv_path_sever(iucv_sk(sk)->path, NULL);
1309                 iucv_path_free(iucv_sk(sk)->path);
1310                 iucv_sk(sk)->path = NULL;
1311         }
1312
1313         sock_orphan(sk);
1314         iucv_sock_kill(sk);
1315         return err;
1316 }
1317
1318 /* getsockopt and setsockopt */
1319 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1320                                 char __user *optval, int optlen)
1321 {
1322         struct sock *sk = sock->sk;
1323         struct iucv_sock *iucv = iucv_sk(sk);
1324         int val;
1325         int rc;
1326
1327         if (level != SOL_IUCV)
1328                 return -ENOPROTOOPT;
1329
1330         if (optlen < sizeof(int))
1331                 return -EINVAL;
1332
1333         if (get_user(val, (int __user *) optval))
1334                 return -EFAULT;
1335
1336         rc = 0;
1337
1338         lock_sock(sk);
1339         switch (optname) {
1340         case SO_IPRMDATA_MSG:
1341                 if (val)
1342                         iucv->flags |= IUCV_IPRMDATA;
1343                 else
1344                         iucv->flags &= ~IUCV_IPRMDATA;
1345                 break;
1346         case SO_MSGLIMIT:
1347                 switch (sk->sk_state) {
1348                 case IUCV_OPEN:
1349                 case IUCV_BOUND:
1350                         if (val < 1 || val > (u16)(~0))
1351                                 rc = -EINVAL;
1352                         else
1353                                 iucv->msglimit = val;
1354                         break;
1355                 default:
1356                         rc = -EINVAL;
1357                         break;
1358                 }
1359                 break;
1360         default:
1361                 rc = -ENOPROTOOPT;
1362                 break;
1363         }
1364         release_sock(sk);
1365
1366         return rc;
1367 }
1368
1369 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1370                                 char __user *optval, int __user *optlen)
1371 {
1372         struct sock *sk = sock->sk;
1373         struct iucv_sock *iucv = iucv_sk(sk);
1374         int val, len;
1375
1376         if (level != SOL_IUCV)
1377                 return -ENOPROTOOPT;
1378
1379         if (get_user(len, optlen))
1380                 return -EFAULT;
1381
1382         if (len < 0)
1383                 return -EINVAL;
1384
1385         len = min_t(unsigned int, len, sizeof(int));
1386
1387         switch (optname) {
1388         case SO_IPRMDATA_MSG:
1389                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1390                 break;
1391         case SO_MSGLIMIT:
1392                 lock_sock(sk);
1393                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1394                                            : iucv->msglimit;    /* default */
1395                 release_sock(sk);
1396                 break;
1397         default:
1398                 return -ENOPROTOOPT;
1399         }
1400
1401         if (put_user(len, optlen))
1402                 return -EFAULT;
1403         if (copy_to_user(optval, &val, len))
1404                 return -EFAULT;
1405
1406         return 0;
1407 }
1408
1409
1410 /* Callback wrappers - called from iucv base support */
1411 static int iucv_callback_connreq(struct iucv_path *path,
1412                                  u8 ipvmid[8], u8 ipuser[16])
1413 {
1414         unsigned char user_data[16];
1415         unsigned char nuser_data[16];
1416         unsigned char src_name[8];
1417         struct hlist_node *node;
1418         struct sock *sk, *nsk;
1419         struct iucv_sock *iucv, *niucv;
1420         int err;
1421
1422         memcpy(src_name, ipuser, 8);
1423         EBCASC(src_name, 8);
1424         /* Find out if this path belongs to af_iucv. */
1425         read_lock(&iucv_sk_list.lock);
1426         iucv = NULL;
1427         sk = NULL;
1428         sk_for_each(sk, node, &iucv_sk_list.head)
1429                 if (sk->sk_state == IUCV_LISTEN &&
1430                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1431                         /*
1432                          * Found a listening socket with
1433                          * src_name == ipuser[0-7].
1434                          */
1435                         iucv = iucv_sk(sk);
1436                         break;
1437                 }
1438         read_unlock(&iucv_sk_list.lock);
1439         if (!iucv)
1440                 /* No socket found, not one of our paths. */
1441                 return -EINVAL;
1442
1443         bh_lock_sock(sk);
1444
1445         /* Check if parent socket is listening */
1446         low_nmcpy(user_data, iucv->src_name);
1447         high_nmcpy(user_data, iucv->dst_name);
1448         ASCEBC(user_data, sizeof(user_data));
1449         if (sk->sk_state != IUCV_LISTEN) {
1450                 err = iucv_path_sever(path, user_data);
1451                 iucv_path_free(path);
1452                 goto fail;
1453         }
1454
1455         /* Check for backlog size */
1456         if (sk_acceptq_is_full(sk)) {
1457                 err = iucv_path_sever(path, user_data);
1458                 iucv_path_free(path);
1459                 goto fail;
1460         }
1461
1462         /* Create the new socket */
1463         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1464         if (!nsk) {
1465                 err = iucv_path_sever(path, user_data);
1466                 iucv_path_free(path);
1467                 goto fail;
1468         }
1469
1470         niucv = iucv_sk(nsk);
1471         iucv_sock_init(nsk, sk);
1472
1473         /* Set the new iucv_sock */
1474         memcpy(niucv->dst_name, ipuser + 8, 8);
1475         EBCASC(niucv->dst_name, 8);
1476         memcpy(niucv->dst_user_id, ipvmid, 8);
1477         memcpy(niucv->src_name, iucv->src_name, 8);
1478         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1479         niucv->path = path;
1480
1481         /* Call iucv_accept */
1482         high_nmcpy(nuser_data, ipuser + 8);
1483         memcpy(nuser_data + 8, niucv->src_name, 8);
1484         ASCEBC(nuser_data + 8, 8);
1485
1486         /* set message limit for path based on msglimit of accepting socket */
1487         niucv->msglimit = iucv->msglimit;
1488         path->msglim = iucv->msglimit;
1489         err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1490         if (err) {
1491                 err = iucv_path_sever(path, user_data);
1492                 iucv_path_free(path);
1493                 iucv_sock_kill(nsk);
1494                 goto fail;
1495         }
1496
1497         iucv_accept_enqueue(sk, nsk);
1498
1499         /* Wake up accept */
1500         nsk->sk_state = IUCV_CONNECTED;
1501         sk->sk_data_ready(sk, 1);
1502         err = 0;
1503 fail:
1504         bh_unlock_sock(sk);
1505         return 0;
1506 }
1507
1508 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1509 {
1510         struct sock *sk = path->private;
1511
1512         sk->sk_state = IUCV_CONNECTED;
1513         sk->sk_state_change(sk);
1514 }
1515
1516 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1517 {
1518         struct sock *sk = path->private;
1519         struct iucv_sock *iucv = iucv_sk(sk);
1520         struct sk_buff *skb;
1521         struct sock_msg_q *save_msg;
1522         int len;
1523
1524         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1525                 iucv_message_reject(path, msg);
1526                 return;
1527         }
1528
1529         spin_lock(&iucv->message_q.lock);
1530
1531         if (!list_empty(&iucv->message_q.list) ||
1532             !skb_queue_empty(&iucv->backlog_skb_q))
1533                 goto save_message;
1534
1535         len = atomic_read(&sk->sk_rmem_alloc);
1536         len += iucv_msg_length(msg) + sizeof(struct sk_buff);
1537         if (len > sk->sk_rcvbuf)
1538                 goto save_message;
1539
1540         skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1541         if (!skb)
1542                 goto save_message;
1543
1544         iucv_process_message(sk, skb, path, msg);
1545         goto out_unlock;
1546
1547 save_message:
1548         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1549         if (!save_msg)
1550                 return;
1551         save_msg->path = path;
1552         save_msg->msg = *msg;
1553
1554         list_add_tail(&save_msg->list, &iucv->message_q.list);
1555
1556 out_unlock:
1557         spin_unlock(&iucv->message_q.lock);
1558 }
1559
1560 static void iucv_callback_txdone(struct iucv_path *path,
1561                                  struct iucv_message *msg)
1562 {
1563         struct sock *sk = path->private;
1564         struct sk_buff *this = NULL;
1565         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1566         struct sk_buff *list_skb = list->next;
1567         unsigned long flags;
1568
1569         if (!skb_queue_empty(list)) {
1570                 spin_lock_irqsave(&list->lock, flags);
1571
1572                 while (list_skb != (struct sk_buff *)list) {
1573                         if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1574                                 this = list_skb;
1575                                 break;
1576                         }
1577                         list_skb = list_skb->next;
1578                 }
1579                 if (this)
1580                         __skb_unlink(this, list);
1581
1582                 spin_unlock_irqrestore(&list->lock, flags);
1583
1584                 kfree_skb(this);
1585         }
1586         BUG_ON(!this);
1587
1588         if (sk->sk_state == IUCV_CLOSING) {
1589                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1590                         sk->sk_state = IUCV_CLOSED;
1591                         sk->sk_state_change(sk);
1592                 }
1593         }
1594
1595 }
1596
1597 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1598 {
1599         struct sock *sk = path->private;
1600
1601         if (!list_empty(&iucv_sk(sk)->accept_q))
1602                 sk->sk_state = IUCV_SEVERED;
1603         else
1604                 sk->sk_state = IUCV_DISCONN;
1605
1606         sk->sk_state_change(sk);
1607 }
1608
1609 /* called if the other communication side shuts down its RECV direction;
1610  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1611  */
1612 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1613 {
1614         struct sock *sk = path->private;
1615
1616         bh_lock_sock(sk);
1617         if (sk->sk_state != IUCV_CLOSED) {
1618                 sk->sk_shutdown |= SEND_SHUTDOWN;
1619                 sk->sk_state_change(sk);
1620         }
1621         bh_unlock_sock(sk);
1622 }
1623
1624 static struct proto_ops iucv_sock_ops = {
1625         .family         = PF_IUCV,
1626         .owner          = THIS_MODULE,
1627         .release        = iucv_sock_release,
1628         .bind           = iucv_sock_bind,
1629         .connect        = iucv_sock_connect,
1630         .listen         = iucv_sock_listen,
1631         .accept         = iucv_sock_accept,
1632         .getname        = iucv_sock_getname,
1633         .sendmsg        = iucv_sock_sendmsg,
1634         .recvmsg        = iucv_sock_recvmsg,
1635         .poll           = iucv_sock_poll,
1636         .ioctl          = sock_no_ioctl,
1637         .mmap           = sock_no_mmap,
1638         .socketpair     = sock_no_socketpair,
1639         .shutdown       = iucv_sock_shutdown,
1640         .setsockopt     = iucv_sock_setsockopt,
1641         .getsockopt     = iucv_sock_getsockopt,
1642 };
1643
1644 static struct net_proto_family iucv_sock_family_ops = {
1645         .family = AF_IUCV,
1646         .owner  = THIS_MODULE,
1647         .create = iucv_sock_create,
1648 };
1649
1650 static int __init afiucv_init(void)
1651 {
1652         int err;
1653
1654         if (!MACHINE_IS_VM) {
1655                 pr_err("The af_iucv module cannot be loaded"
1656                        " without z/VM\n");
1657                 err = -EPROTONOSUPPORT;
1658                 goto out;
1659         }
1660         cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1661         if (unlikely(err)) {
1662                 WARN_ON(err);
1663                 err = -EPROTONOSUPPORT;
1664                 goto out;
1665         }
1666
1667         err = iucv_register(&af_iucv_handler, 0);
1668         if (err)
1669                 goto out;
1670         err = proto_register(&iucv_proto, 0);
1671         if (err)
1672                 goto out_iucv;
1673         err = sock_register(&iucv_sock_family_ops);
1674         if (err)
1675                 goto out_proto;
1676         /* establish dummy device */
1677         err = driver_register(&af_iucv_driver);
1678         if (err)
1679                 goto out_sock;
1680         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
1681         if (!af_iucv_dev) {
1682                 err = -ENOMEM;
1683                 goto out_driver;
1684         }
1685         dev_set_name(af_iucv_dev, "af_iucv");
1686         af_iucv_dev->bus = &iucv_bus;
1687         af_iucv_dev->parent = iucv_root;
1688         af_iucv_dev->release = (void (*)(struct device *))kfree;
1689         af_iucv_dev->driver = &af_iucv_driver;
1690         err = device_register(af_iucv_dev);
1691         if (err)
1692                 goto out_driver;
1693
1694         return 0;
1695
1696 out_driver:
1697         driver_unregister(&af_iucv_driver);
1698 out_sock:
1699         sock_unregister(PF_IUCV);
1700 out_proto:
1701         proto_unregister(&iucv_proto);
1702 out_iucv:
1703         iucv_unregister(&af_iucv_handler, 0);
1704 out:
1705         return err;
1706 }
1707
1708 static void __exit afiucv_exit(void)
1709 {
1710         device_unregister(af_iucv_dev);
1711         driver_unregister(&af_iucv_driver);
1712         sock_unregister(PF_IUCV);
1713         proto_unregister(&iucv_proto);
1714         iucv_unregister(&af_iucv_handler, 0);
1715 }
1716
1717 module_init(afiucv_init);
1718 module_exit(afiucv_exit);
1719
1720 MODULE_AUTHOR("Jennifer Hunt <[email protected]>");
1721 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1722 MODULE_VERSION(VERSION);
1723 MODULE_LICENSE("GPL");
1724 MODULE_ALIAS_NETPROTO(PF_IUCV);