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 <jenhunt@us.ibm.com>
   7  *              Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
   8  *  PM functions:
   9  *              Ursula Braun <ursula.braun@de.ibm.com>
  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 const 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 #define __iucv_sock_wait(sk, condition, timeo, ret)                     \
  58 do {                                                                    \
  59         DEFINE_WAIT(__wait);                                            \
  60         long __timeo = timeo;                                           \
  61         ret = 0;                                                        \
  62         prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);     \
  63         while (!(condition)) {                                          \
  64                 if (!__timeo) {                                         \
  65                         ret = -EAGAIN;                                  \
  66                         break;                                          \
  67                 }                                                       \
  68                 if (signal_pending(current)) {                          \
  69                         ret = sock_intr_errno(__timeo);                 \
  70                         break;                                          \
  71                 }                                                       \
  72                 release_sock(sk);                                       \
  73                 __timeo = schedule_timeout(__timeo);                    \
  74                 lock_sock(sk);                                          \
  75                 ret = sock_error(sk);                                   \
  76                 if (ret)                                                \
  77                         break;                                          \
  78         }                                                               \
  79         finish_wait(sk_sleep(sk), &__wait);                             \
  80 } while (0)
  81
  82 #define iucv_sock_wait(sk, condition, timeo)                            \
  83 ({                                                                      \
  84         int __ret = 0;                                                  \
  85         if (!(condition))                                               \
  86                 __iucv_sock_wait(sk, condition, timeo, __ret);          \
  87         __ret;                                                          \
  88 })
  89
  90 static void iucv_sock_kill(struct sock *sk);
  91 static void iucv_sock_close(struct sock *sk);
  92
  93 /* Call Back functions */
  94 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  95 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  96 static void iucv_callback_connack(struct iucv_path *, u8 ipuser[16]);
  97 static int iucv_callback_connreq(struct iucv_path *, u8 ipvmid[8],
  98                                  u8 ipuser[16]);
  99 static void iucv_callback_connrej(struct iucv_path *, u8 ipuser[16]);
 100 static void iucv_callback_shutdown(struct iucv_path *, u8 ipuser[16]);
 101
 102 static struct iucv_sock_list iucv_sk_list = {
 103         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
 104         .autobind_name = ATOMIC_INIT(0)
 105 };
 106
 107 static struct iucv_handler af_iucv_handler = {
 108         .path_pending     = iucv_callback_connreq,
 109         .path_complete    = iucv_callback_connack,
 110         .path_severed     = iucv_callback_connrej,
 111         .message_pending  = iucv_callback_rx,
 112         .message_complete = iucv_callback_txdone,
 113         .path_quiesced    = iucv_callback_shutdown,
 114 };
 115
 116 static inline void high_nmcpy(unsigned char *dst, char *src)
 117 {
 118        memcpy(dst, src, 8);
 119 }
 120
 121 static inline void low_nmcpy(unsigned char *dst, char *src)
 122 {
 123        memcpy(&dst[8], src, 8);
 124 }
 125
 126 static int afiucv_pm_prepare(struct device *dev)
 127 {
 128 #ifdef CONFIG_PM_DEBUG
 129         printk(KERN_WARNING "afiucv_pm_prepare\n");
 130 #endif
 131         return 0;
 132 }
 133
 134 static void afiucv_pm_complete(struct device *dev)
 135 {
 136 #ifdef CONFIG_PM_DEBUG
 137         printk(KERN_WARNING "afiucv_pm_complete\n");
 138 #endif
 139         return;
 140 }
 141
 142 /**
 143  * afiucv_pm_freeze() - Freeze PM callback
 144  * @dev:        AFIUCV dummy device
 145  *
 146  * Sever all established IUCV communication pathes
 147  */
 148 static int afiucv_pm_freeze(struct device *dev)
 149 {
 150         struct iucv_sock *iucv;
 151         struct sock *sk;
 152         struct hlist_node *node;
 153         int err = 0;
 154
 155 #ifdef CONFIG_PM_DEBUG
 156         printk(KERN_WARNING "afiucv_pm_freeze\n");
 157 #endif
 158         read_lock(&iucv_sk_list.lock);
 159         sk_for_each(sk, node, &iucv_sk_list.head) {
 160                 iucv = iucv_sk(sk);
 161                 skb_queue_purge(&iucv->send_skb_q);
 162                 skb_queue_purge(&iucv->backlog_skb_q);
 163                 switch (sk->sk_state) {
 164                 case IUCV_SEVERED:
 165                 case IUCV_DISCONN:
 166                 case IUCV_CLOSING:
 167                 case IUCV_CONNECTED:
 168                         if (iucv->path) {
 169                                 err = iucv_path_sever(iucv->path, NULL);
 170                                 iucv_path_free(iucv->path);
 171                                 iucv->path = NULL;
 172                         }
 173                         break;
 174                 case IUCV_OPEN:
 175                 case IUCV_BOUND:
 176                 case IUCV_LISTEN:
 177                 case IUCV_CLOSED:
 178                 default:
 179                         break;
 180                 }
 181         }
 182         read_unlock(&iucv_sk_list.lock);
 183         return err;
 184 }
 185
 186 /**
 187  * afiucv_pm_restore_thaw() - Thaw and restore PM callback
 188  * @dev:        AFIUCV dummy device
 189  *
 190  * socket clean up after freeze
 191  */
 192 static int afiucv_pm_restore_thaw(struct device *dev)
 193 {
 194         struct iucv_sock *iucv;
 195         struct sock *sk;
 196         struct hlist_node *node;
 197
 198 #ifdef CONFIG_PM_DEBUG
 199         printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
 200 #endif
 201         read_lock(&iucv_sk_list.lock);
 202         sk_for_each(sk, node, &iucv_sk_list.head) {
 203                 iucv = iucv_sk(sk);
 204                 switch (sk->sk_state) {
 205                 case IUCV_CONNECTED:
 206                         sk->sk_err = EPIPE;
 207                         sk->sk_state = IUCV_DISCONN;
 208                         sk->sk_state_change(sk);
 209                         break;
 210                 case IUCV_DISCONN:
 211                 case IUCV_SEVERED:
 212                 case IUCV_CLOSING:
 213                 case IUCV_LISTEN:
 214                 case IUCV_BOUND:
 215                 case IUCV_OPEN:
 216                 default:
 217                         break;
 218                 }
 219         }
 220         read_unlock(&iucv_sk_list.lock);
 221         return 0;
 222 }
 223
 224 static const struct dev_pm_ops afiucv_pm_ops = {
 225         .prepare = afiucv_pm_prepare,
 226         .complete = afiucv_pm_complete,
 227         .freeze = afiucv_pm_freeze,
 228         .thaw = afiucv_pm_restore_thaw,
 229         .restore = afiucv_pm_restore_thaw,
 230 };
 231
 232 static struct device_driver af_iucv_driver = {
 233         .owner = THIS_MODULE,
 234         .name = "afiucv",
 235         .bus  = &iucv_bus,
 236         .pm   = &afiucv_pm_ops,
 237 };
 238
 239 /* dummy device used as trigger for PM functions */
 240 static struct device *af_iucv_dev;
 241
 242 /**
 243  * iucv_msg_length() - Returns the length of an iucv message.
 244  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
 245  *
 246  * The function returns the length of the specified iucv message @msg of data
 247  * stored in a buffer and of data stored in the parameter list (PRMDATA).
 248  *
 249  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 250  * data:
 251  *      PRMDATA[0..6]   socket data (max 7 bytes);
 252  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
 253  *
 254  * The socket data length is computed by substracting the socket data length
 255  * value from 0xFF.
 256  * If the socket data len is greater 7, then PRMDATA can be used for special
 257  * notifications (see iucv_sock_shutdown); and further,
 258  * if the socket data len is > 7, the function returns 8.
 259  *
 260  * Use this function to allocate socket buffers to store iucv message data.
 261  */
 262 static inline size_t iucv_msg_length(struct iucv_message *msg)
 263 {
 264         size_t datalen;
 265
 266         if (msg->flags & IUCV_IPRMDATA) {
 267                 datalen = 0xff - msg->rmmsg[7];
 268                 return (datalen < 8) ? datalen : 8;
 269         }
 270         return msg->length;
 271 }
 272
 273 /**
 274  * iucv_sock_in_state() - check for specific states
 275  * @sk:         sock structure
 276  * @state:      first iucv sk state
 277  * @state:      second iucv sk state
 278  *
 279  * Returns true if the socket in either in the first or second state.
 280  */
 281 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
 282 {
 283         return (sk->sk_state == state || sk->sk_state == state2);
 284 }
 285
 286 /**
 287  * iucv_below_msglim() - function to check if messages can be sent
 288  * @sk:         sock structure
 289  *
 290  * Returns true if the send queue length is lower than the message limit.
 291  * Always returns true if the socket is not connected (no iucv path for
 292  * checking the message limit).
 293  */
 294 static inline int iucv_below_msglim(struct sock *sk)
 295 {
 296         struct iucv_sock *iucv = iucv_sk(sk);
 297
 298         if (sk->sk_state != IUCV_CONNECTED)
 299                 return 1;
 300         return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
 301 }
 302
 303 /**
 304  * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
 305  */
 306 static void iucv_sock_wake_msglim(struct sock *sk)
 307 {
 308         struct socket_wq *wq;
 309
 310         rcu_read_lock();
 311         wq = rcu_dereference(sk->sk_wq);
 312         if (wq_has_sleeper(wq))
 313                 wake_up_interruptible_all(&wq->wait);
 314         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 315         rcu_read_unlock();
 316 }
 317
 318 /* Timers */
 319 static void iucv_sock_timeout(unsigned long arg)
 320 {
 321         struct sock *sk = (struct sock *)arg;
 322
 323         bh_lock_sock(sk);
 324         sk->sk_err = ETIMEDOUT;
 325         sk->sk_state_change(sk);
 326         bh_unlock_sock(sk);
 327
 328         iucv_sock_kill(sk);
 329         sock_put(sk);
 330 }
 331
 332 static void iucv_sock_clear_timer(struct sock *sk)
 333 {
 334         sk_stop_timer(sk, &sk->sk_timer);
 335 }
 336
 337 static struct sock *__iucv_get_sock_by_name(char *nm)
 338 {
 339         struct sock *sk;
 340         struct hlist_node *node;
 341
 342         sk_for_each(sk, node, &iucv_sk_list.head)
 343                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 344                         return sk;
 345
 346         return NULL;
 347 }
 348
 349 static void iucv_sock_destruct(struct sock *sk)
 350 {
 351         skb_queue_purge(&sk->sk_receive_queue);
 352         skb_queue_purge(&sk->sk_write_queue);
 353 }
 354
 355 /* Cleanup Listen */
 356 static void iucv_sock_cleanup_listen(struct sock *parent)
 357 {
 358         struct sock *sk;
 359
 360         /* Close non-accepted connections */
 361         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 362                 iucv_sock_close(sk);
 363                 iucv_sock_kill(sk);
 364         }
 365
 366         parent->sk_state = IUCV_CLOSED;
 367 }
 368
 369 /* Kill socket (only if zapped and orphaned) */
 370 static void iucv_sock_kill(struct sock *sk)
 371 {
 372         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 373                 return;
 374
 375         iucv_sock_unlink(&iucv_sk_list, sk);
 376         sock_set_flag(sk, SOCK_DEAD);
 377         sock_put(sk);
 378 }
 379
 380 /* Close an IUCV socket */
 381 static void iucv_sock_close(struct sock *sk)
 382 {
 383         unsigned char user_data[16];
 384         struct iucv_sock *iucv = iucv_sk(sk);
 385         int err;
 386         unsigned long timeo;
 387
 388         iucv_sock_clear_timer(sk);
 389         lock_sock(sk);
 390
 391         switch (sk->sk_state) {
 392         case IUCV_LISTEN:
 393                 iucv_sock_cleanup_listen(sk);
 394                 break;
 395
 396         case IUCV_CONNECTED:
 397         case IUCV_DISCONN:
 398                 err = 0;
 399
 400                 sk->sk_state = IUCV_CLOSING;
 401                 sk->sk_state_change(sk);
 402
 403                 if (!skb_queue_empty(&iucv->send_skb_q)) {
 404                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 405                                 timeo = sk->sk_lingertime;
 406                         else
 407                                 timeo = IUCV_DISCONN_TIMEOUT;
 408                         err = iucv_sock_wait(sk,
 409                                         iucv_sock_in_state(sk, IUCV_CLOSED, 0),
 410                                         timeo);
 411                 }
 412
 413         case IUCV_CLOSING:   /* fall through */
 414                 sk->sk_state = IUCV_CLOSED;
 415                 sk->sk_state_change(sk);
 416
 417                 if (iucv->path) {
 418                         low_nmcpy(user_data, iucv->src_name);
 419                         high_nmcpy(user_data, iucv->dst_name);
 420                         ASCEBC(user_data, sizeof(user_data));
 421                         err = iucv_path_sever(iucv->path, user_data);
 422                         iucv_path_free(iucv->path);
 423                         iucv->path = NULL;
 424                 }
 425
 426                 sk->sk_err = ECONNRESET;
 427                 sk->sk_state_change(sk);
 428
 429                 skb_queue_purge(&iucv->send_skb_q);
 430                 skb_queue_purge(&iucv->backlog_skb_q);
 431                 break;
 432
 433         default:
 434                 /* nothing to do here */
 435                 break;
 436         }
 437
 438         /* mark socket for deletion by iucv_sock_kill() */
 439         sock_set_flag(sk, SOCK_ZAPPED);
 440
 441         release_sock(sk);
 442 }
 443
 444 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 445 {
 446         if (parent)
 447                 sk->sk_type = parent->sk_type;
 448 }
 449
 450 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio)
 451 {
 452         struct sock *sk;
 453
 454         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto);
 455         if (!sk)
 456                 return NULL;
 457
 458         sock_init_data(sock, sk);
 459         INIT_LIST_HEAD(&iucv_sk(sk)->accept_q);
 460         spin_lock_init(&iucv_sk(sk)->accept_q_lock);
 461         skb_queue_head_init(&iucv_sk(sk)->send_skb_q);
 462         INIT_LIST_HEAD(&iucv_sk(sk)->message_q.list);
 463         spin_lock_init(&iucv_sk(sk)->message_q.lock);
 464         skb_queue_head_init(&iucv_sk(sk)->backlog_skb_q);
 465         iucv_sk(sk)->send_tag = 0;
 466         iucv_sk(sk)->flags = 0;
 467         iucv_sk(sk)->msglimit = IUCV_QUEUELEN_DEFAULT;
 468         iucv_sk(sk)->path = NULL;
 469         memset(&iucv_sk(sk)->src_user_id , 0, 32);
 470
 471         sk->sk_destruct = iucv_sock_destruct;
 472         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 473         sk->sk_allocation = GFP_DMA;
 474
 475         sock_reset_flag(sk, SOCK_ZAPPED);
 476
 477         sk->sk_protocol = proto;
 478         sk->sk_state    = IUCV_OPEN;
 479
 480         setup_timer(&sk->sk_timer, iucv_sock_timeout, (unsigned long)sk);
 481
 482         iucv_sock_link(&iucv_sk_list, sk);
 483         return sk;
 484 }
 485
 486 /* Create an IUCV socket */
 487 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
 488                             int kern)
 489 {
 490         struct sock *sk;
 491
 492         if (protocol && protocol != PF_IUCV)
 493                 return -EPROTONOSUPPORT;
 494
 495         sock->state = SS_UNCONNECTED;
 496
 497         switch (sock->type) {
 498         case SOCK_STREAM:
 499                 sock->ops = &iucv_sock_ops;
 500                 break;
 501         case SOCK_SEQPACKET:
 502                 /* currently, proto ops can handle both sk types */
 503                 sock->ops = &iucv_sock_ops;
 504                 break;
 505         default:
 506                 return -ESOCKTNOSUPPORT;
 507         }
 508
 509         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL);
 510         if (!sk)
 511                 return -ENOMEM;
 512
 513         iucv_sock_init(sk, NULL);
 514
 515         return 0;
 516 }
 517
 518 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 519 {
 520         write_lock_bh(&l->lock);
 521         sk_add_node(sk, &l->head);
 522         write_unlock_bh(&l->lock);
 523 }
 524
 525 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 526 {
 527         write_lock_bh(&l->lock);
 528         sk_del_node_init(sk);
 529         write_unlock_bh(&l->lock);
 530 }
 531
 532 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 533 {
 534         unsigned long flags;
 535         struct iucv_sock *par = iucv_sk(parent);
 536
 537         sock_hold(sk);
 538         spin_lock_irqsave(&par->accept_q_lock, flags);
 539         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 540         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 541         iucv_sk(sk)->parent = parent;
 542         sk_acceptq_added(parent);
 543 }
 544
 545 void iucv_accept_unlink(struct sock *sk)
 546 {
 547         unsigned long flags;
 548         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 549
 550         spin_lock_irqsave(&par->accept_q_lock, flags);
 551         list_del_init(&iucv_sk(sk)->accept_q);
 552         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 553         sk_acceptq_removed(iucv_sk(sk)->parent);
 554         iucv_sk(sk)->parent = NULL;
 555         sock_put(sk);
 556 }
 557
 558 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 559 {
 560         struct iucv_sock *isk, *n;
 561         struct sock *sk;
 562
 563         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 564                 sk = (struct sock *) isk;
 565                 lock_sock(sk);
 566
 567                 if (sk->sk_state == IUCV_CLOSED) {
 568                         iucv_accept_unlink(sk);
 569                         release_sock(sk);
 570                         continue;
 571                 }
 572
 573                 if (sk->sk_state == IUCV_CONNECTED ||
 574                     sk->sk_state == IUCV_SEVERED ||
 575                     sk->sk_state == IUCV_DISCONN ||     /* due to PM restore */
 576                     !newsock) {
 577                         iucv_accept_unlink(sk);
 578                         if (newsock)
 579                                 sock_graft(sk, newsock);
 580
 581                         if (sk->sk_state == IUCV_SEVERED)
 582                                 sk->sk_state = IUCV_DISCONN;
 583
 584                         release_sock(sk);
 585                         return sk;
 586                 }
 587
 588                 release_sock(sk);
 589         }
 590         return NULL;
 591 }
 592
 593 /* Bind an unbound socket */
 594 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 595                           int addr_len)
 596 {
 597         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 598         struct sock *sk = sock->sk;
 599         struct iucv_sock *iucv;
 600         int err;
 601
 602         /* Verify the input sockaddr */
 603         if (!addr || addr->sa_family != AF_IUCV)
 604                 return -EINVAL;
 605
 606         lock_sock(sk);
 607         if (sk->sk_state != IUCV_OPEN) {
 608                 err = -EBADFD;
 609                 goto done;
 610         }
 611
 612         write_lock_bh(&iucv_sk_list.lock);
 613
 614         iucv = iucv_sk(sk);
 615         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 616                 err = -EADDRINUSE;
 617                 goto done_unlock;
 618         }
 619         if (iucv->path) {
 620                 err = 0;
 621                 goto done_unlock;
 622         }
 623
 624         /* Bind the socket */
 625         memcpy(iucv->src_name, sa->siucv_name, 8);
 626
 627         /* Copy the user id */
 628         memcpy(iucv->src_user_id, iucv_userid, 8);
 629         sk->sk_state = IUCV_BOUND;
 630         err = 0;
 631
 632 done_unlock:
 633         /* Release the socket list lock */
 634         write_unlock_bh(&iucv_sk_list.lock);
 635 done:
 636         release_sock(sk);
 637         return err;
 638 }
 639
 640 /* Automatically bind an unbound socket */
 641 static int iucv_sock_autobind(struct sock *sk)
 642 {
 643         struct iucv_sock *iucv = iucv_sk(sk);
 644         char query_buffer[80];
 645         char name[12];
 646         int err = 0;
 647
 648         /* Set the userid and name */
 649         cpcmd("QUERY USERID", query_buffer, sizeof(query_buffer), &err);
 650         if (unlikely(err))
 651                 return -EPROTO;
 652
 653         memcpy(iucv->src_user_id, query_buffer, 8);
 654
 655         write_lock_bh(&iucv_sk_list.lock);
 656
 657         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 658         while (__iucv_get_sock_by_name(name)) {
 659                 sprintf(name, "%08x",
 660                         atomic_inc_return(&iucv_sk_list.autobind_name));
 661         }
 662
 663         write_unlock_bh(&iucv_sk_list.lock);
 664
 665         memcpy(&iucv->src_name, name, 8);
 666
 667         return err;
 668 }
 669
 670 /* Connect an unconnected socket */
 671 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 672                              int alen, int flags)
 673 {
 674         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 675         struct sock *sk = sock->sk;
 676         struct iucv_sock *iucv;
 677         unsigned char user_data[16];
 678         int err;
 679
 680         if (addr->sa_family != AF_IUCV || alen < sizeof(struct sockaddr_iucv))
 681                 return -EINVAL;
 682
 683         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 684                 return -EBADFD;
 685
 686         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 687                 return -EINVAL;
 688
 689         if (sk->sk_state == IUCV_OPEN) {
 690                 err = iucv_sock_autobind(sk);
 691                 if (unlikely(err))
 692                         return err;
 693         }
 694
 695         lock_sock(sk);
 696
 697         /* Set the destination information */
 698         memcpy(iucv_sk(sk)->dst_user_id, sa->siucv_user_id, 8);
 699         memcpy(iucv_sk(sk)->dst_name, sa->siucv_name, 8);
 700
 701         high_nmcpy(user_data, sa->siucv_name);
 702         low_nmcpy(user_data, iucv_sk(sk)->src_name);
 703         ASCEBC(user_data, sizeof(user_data));
 704
 705         iucv = iucv_sk(sk);
 706         /* Create path. */
 707         iucv->path = iucv_path_alloc(iucv->msglimit,
 708                                      IUCV_IPRMDATA, GFP_KERNEL);
 709         if (!iucv->path) {
 710                 err = -ENOMEM;
 711                 goto done;
 712         }
 713         err = iucv_path_connect(iucv->path, &af_iucv_handler,
 714                                 sa->siucv_user_id, NULL, user_data, sk);
 715         if (err) {
 716                 iucv_path_free(iucv->path);
 717                 iucv->path = NULL;
 718                 switch (err) {
 719                 case 0x0b:      /* Target communicator is not logged on */
 720                         err = -ENETUNREACH;
 721                         break;
 722                 case 0x0d:      /* Max connections for this guest exceeded */
 723                 case 0x0e:      /* Max connections for target guest exceeded */
 724                         err = -EAGAIN;
 725                         break;
 726                 case 0x0f:      /* Missing IUCV authorization */
 727                         err = -EACCES;
 728                         break;
 729                 default:
 730                         err = -ECONNREFUSED;
 731                         break;
 732                 }
 733                 goto done;
 734         }
 735
 736         if (sk->sk_state != IUCV_CONNECTED) {
 737                 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
 738                                                             IUCV_DISCONN),
 739                                      sock_sndtimeo(sk, flags & O_NONBLOCK));
 740         }
 741
 742         if (sk->sk_state == IUCV_DISCONN) {
 743                 err = -ECONNREFUSED;
 744         }
 745
 746         if (err) {
 747                 iucv_path_sever(iucv->path, NULL);
 748                 iucv_path_free(iucv->path);
 749                 iucv->path = NULL;
 750         }
 751
 752 done:
 753         release_sock(sk);
 754         return err;
 755 }
 756
 757 /* Move a socket into listening state. */
 758 static int iucv_sock_listen(struct socket *sock, int backlog)
 759 {
 760         struct sock *sk = sock->sk;
 761         int err;
 762
 763         lock_sock(sk);
 764
 765         err = -EINVAL;
 766         if (sk->sk_state != IUCV_BOUND)
 767                 goto done;
 768
 769         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 770                 goto done;
 771
 772         sk->sk_max_ack_backlog = backlog;
 773         sk->sk_ack_backlog = 0;
 774         sk->sk_state = IUCV_LISTEN;
 775         err = 0;
 776
 777 done:
 778         release_sock(sk);
 779         return err;
 780 }
 781
 782 /* Accept a pending connection */
 783 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 784                             int flags)
 785 {
 786         DECLARE_WAITQUEUE(wait, current);
 787         struct sock *sk = sock->sk, *nsk;
 788         long timeo;
 789         int err = 0;
 790
 791         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 792
 793         if (sk->sk_state != IUCV_LISTEN) {
 794                 err = -EBADFD;
 795                 goto done;
 796         }
 797
 798         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 799
 800         /* Wait for an incoming connection */
 801         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 802         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 803                 set_current_state(TASK_INTERRUPTIBLE);
 804                 if (!timeo) {
 805                         err = -EAGAIN;
 806                         break;
 807                 }
 808
 809                 release_sock(sk);
 810                 timeo = schedule_timeout(timeo);
 811                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 812
 813                 if (sk->sk_state != IUCV_LISTEN) {
 814                         err = -EBADFD;
 815                         break;
 816                 }
 817
 818                 if (signal_pending(current)) {
 819                         err = sock_intr_errno(timeo);
 820                         break;
 821                 }
 822         }
 823
 824         set_current_state(TASK_RUNNING);
 825         remove_wait_queue(sk_sleep(sk), &wait);
 826
 827         if (err)
 828                 goto done;
 829
 830         newsock->state = SS_CONNECTED;
 831
 832 done:
 833         release_sock(sk);
 834         return err;
 835 }
 836
 837 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 838                              int *len, int peer)
 839 {
 840         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 841         struct sock *sk = sock->sk;
 842
 843         addr->sa_family = AF_IUCV;
 844         *len = sizeof(struct sockaddr_iucv);
 845
 846         if (peer) {
 847                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->dst_user_id, 8);
 848                 memcpy(siucv->siucv_name, &iucv_sk(sk)->dst_name, 8);
 849         } else {
 850                 memcpy(siucv->siucv_user_id, iucv_sk(sk)->src_user_id, 8);
 851                 memcpy(siucv->siucv_name, iucv_sk(sk)->src_name, 8);
 852         }
 853         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
 854         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
 855         memset(siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
 856
 857         return 0;
 858 }
 859
 860 /**
 861  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
 862  * @path:       IUCV path
 863  * @msg:        Pointer to a struct iucv_message
 864  * @skb:        The socket data to send, skb->len MUST BE <= 7
 865  *
 866  * Send the socket data in the parameter list in the iucv message
 867  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
 868  * list and the socket data len at index 7 (last byte).
 869  * See also iucv_msg_length().
 870  *
 871  * Returns the error code from the iucv_message_send() call.
 872  */
 873 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
 874                           struct sk_buff *skb)
 875 {
 876         u8 prmdata[8];
 877
 878         memcpy(prmdata, (void *) skb->data, skb->len);
 879         prmdata[7] = 0xff - (u8) skb->len;
 880         return iucv_message_send(path, msg, IUCV_IPRMDATA, 0,
 881                                  (void *) prmdata, 8);
 882 }
 883
 884 static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
 885                              struct msghdr *msg, size_t len)
 886 {
 887         struct sock *sk = sock->sk;
 888         struct iucv_sock *iucv = iucv_sk(sk);
 889         struct sk_buff *skb;
 890         struct iucv_message txmsg;
 891         struct cmsghdr *cmsg;
 892         int cmsg_done;
 893         long timeo;
 894         char user_id[9];
 895         char appl_id[9];
 896         int err;
 897         int noblock = msg->msg_flags & MSG_DONTWAIT;
 898
 899         err = sock_error(sk);
 900         if (err)
 901                 return err;
 902
 903         if (msg->msg_flags & MSG_OOB)
 904                 return -EOPNOTSUPP;
 905
 906         /* SOCK_SEQPACKET: we do not support segmented records */
 907         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
 908                 return -EOPNOTSUPP;
 909
 910         lock_sock(sk);
 911
 912         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 913                 err = -EPIPE;
 914                 goto out;
 915         }
 916
 917         /* Return if the socket is not in connected state */
 918         if (sk->sk_state != IUCV_CONNECTED) {
 919                 err = -ENOTCONN;
 920                 goto out;
 921         }
 922
 923         /* initialize defaults */
 924         cmsg_done   = 0;        /* check for duplicate headers */
 925         txmsg.class = 0;
 926
 927         /* iterate over control messages */
 928         for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
 929                 cmsg = CMSG_NXTHDR(msg, cmsg)) {
 930
 931                 if (!CMSG_OK(msg, cmsg)) {
 932                         err = -EINVAL;
 933                         goto out;
 934                 }
 935
 936                 if (cmsg->cmsg_level != SOL_IUCV)
 937                         continue;
 938
 939                 if (cmsg->cmsg_type & cmsg_done) {
 940                         err = -EINVAL;
 941                         goto out;
 942                 }
 943                 cmsg_done |= cmsg->cmsg_type;
 944
 945                 switch (cmsg->cmsg_type) {
 946                 case SCM_IUCV_TRGCLS:
 947                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
 948                                 err = -EINVAL;
 949                                 goto out;
 950                         }
 951
 952                         /* set iucv message target class */
 953                         memcpy(&txmsg.class,
 954                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
 955
 956                         break;
 957
 958                 default:
 959                         err = -EINVAL;
 960                         goto out;
 961                         break;
 962                 }
 963         }
 964
 965         /* allocate one skb for each iucv message:
 966          * this is fine for SOCK_SEQPACKET (unless we want to support
 967          * segmented records using the MSG_EOR flag), but
 968          * for SOCK_STREAM we might want to improve it in future */
 969         skb = sock_alloc_send_skb(sk, len, noblock, &err);
 970         if (!skb)
 971                 goto out;
 972         if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
 973                 err = -EFAULT;
 974                 goto fail;
 975         }
 976
 977         /* wait if outstanding messages for iucv path has reached */
 978         timeo = sock_sndtimeo(sk, noblock);
 979         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
 980         if (err)
 981                 goto fail;
 982
 983         /* return -ECONNRESET if the socket is no longer connected */
 984         if (sk->sk_state != IUCV_CONNECTED) {
 985                 err = -ECONNRESET;
 986                 goto fail;
 987         }
 988
 989         /* increment and save iucv message tag for msg_completion cbk */
 990         txmsg.tag = iucv->send_tag++;
 991         memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
 992         skb_queue_tail(&iucv->send_skb_q, skb);
 993
 994         if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
 995               && skb->len <= 7) {
 996                 err = iucv_send_iprm(iucv->path, &txmsg, skb);
 997
 998                 /* on success: there is no message_complete callback
 999                  * for an IPRMDATA msg; remove skb from send queue */
1000                 if (err == 0) {
1001                         skb_unlink(skb, &iucv->send_skb_q);
1002                         kfree_skb(skb);
1003                 }
1004
1005                 /* this error should never happen since the
1006                  * IUCV_IPRMDATA path flag is set... sever path */
1007                 if (err == 0x15) {
1008                         iucv_path_sever(iucv->path, NULL);
1009                         skb_unlink(skb, &iucv->send_skb_q);
1010                         err = -EPIPE;
1011                         goto fail;
1012                 }
1013         } else
1014                 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
1015                                         (void *) skb->data, skb->len);
1016         if (err) {
1017                 if (err == 3) {
1018                         user_id[8] = 0;
1019                         memcpy(user_id, iucv->dst_user_id, 8);
1020                         appl_id[8] = 0;
1021                         memcpy(appl_id, iucv->dst_name, 8);
1022                         pr_err("Application %s on z/VM guest %s"
1023                                 " exceeds message limit\n",
1024                                 appl_id, user_id);
1025                         err = -EAGAIN;
1026                 } else
1027                         err = -EPIPE;
1028                 skb_unlink(skb, &iucv->send_skb_q);
1029                 goto fail;
1030         }
1031
1032         release_sock(sk);
1033         return len;
1034
1035 fail:
1036         kfree_skb(skb);
1037 out:
1038         release_sock(sk);
1039         return err;
1040 }
1041
1042 /* iucv_fragment_skb() - Fragment a single IUCV message into multiple skb's
1043  *
1044  * Locking: must be called with message_q.lock held
1045  */
1046 static int iucv_fragment_skb(struct sock *sk, struct sk_buff *skb, int len)
1047 {
1048         int dataleft, size, copied = 0;
1049         struct sk_buff *nskb;
1050
1051         dataleft = len;
1052         while (dataleft) {
1053                 if (dataleft >= sk->sk_rcvbuf / 4)
1054                         size = sk->sk_rcvbuf / 4;
1055                 else
1056                         size = dataleft;
1057
1058                 nskb = alloc_skb(size, GFP_ATOMIC | GFP_DMA);
1059                 if (!nskb)
1060                         return -ENOMEM;
1061
1062                 /* copy target class to control buffer of new skb */
1063                 memcpy(CB_TRGCLS(nskb), CB_TRGCLS(skb), CB_TRGCLS_LEN);
1064
1065                 /* copy data fragment */
1066                 memcpy(nskb->data, skb->data + copied, size);
1067                 copied += size;
1068                 dataleft -= size;
1069
1070                 skb_reset_transport_header(nskb);
1071                 skb_reset_network_header(nskb);
1072                 nskb->len = size;
1073
1074                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, nskb);
1075         }
1076
1077         return 0;
1078 }
1079
1080 /* iucv_process_message() - Receive a single outstanding IUCV message
1081  *
1082  * Locking: must be called with message_q.lock held
1083  */
1084 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1085                                  struct iucv_path *path,
1086                                  struct iucv_message *msg)
1087 {
1088         int rc;
1089         unsigned int len;
1090
1091         len = iucv_msg_length(msg);
1092
1093         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1094         /* Note: the first 4 bytes are reserved for msg tag */
1095         memcpy(CB_TRGCLS(skb), &msg->class, CB_TRGCLS_LEN);
1096
1097         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1098         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1099                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1100                         skb->data = NULL;
1101                         skb->len = 0;
1102                 }
1103         } else {
1104                 rc = iucv_message_receive(path, msg, msg->flags & IUCV_IPRMDATA,
1105                                           skb->data, len, NULL);
1106                 if (rc) {
1107                         kfree_skb(skb);
1108                         return;
1109                 }
1110                 /* we need to fragment iucv messages for SOCK_STREAM only;
1111                  * for SOCK_SEQPACKET, it is only relevant if we support
1112                  * record segmentation using MSG_EOR (see also recvmsg()) */
1113                 if (sk->sk_type == SOCK_STREAM &&
1114                     skb->truesize >= sk->sk_rcvbuf / 4) {
1115                         rc = iucv_fragment_skb(sk, skb, len);
1116                         kfree_skb(skb);
1117                         skb = NULL;
1118                         if (rc) {
1119                                 iucv_path_sever(path, NULL);
1120                                 return;
1121                         }
1122                         skb = skb_dequeue(&iucv_sk(sk)->backlog_skb_q);
1123                 } else {
1124                         skb_reset_transport_header(skb);
1125                         skb_reset_network_header(skb);
1126                         skb->len = len;
1127                 }
1128         }
1129
1130         if (sock_queue_rcv_skb(sk, skb))
1131                 skb_queue_head(&iucv_sk(sk)->backlog_skb_q, skb);
1132 }
1133
1134 /* iucv_process_message_q() - Process outstanding IUCV messages
1135  *
1136  * Locking: must be called with message_q.lock held
1137  */
1138 static void iucv_process_message_q(struct sock *sk)
1139 {
1140         struct iucv_sock *iucv = iucv_sk(sk);
1141         struct sk_buff *skb;
1142         struct sock_msg_q *p, *n;
1143
1144         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1145                 skb = alloc_skb(iucv_msg_length(&p->msg), GFP_ATOMIC | GFP_DMA);
1146                 if (!skb)
1147                         break;
1148                 iucv_process_message(sk, skb, p->path, &p->msg);
1149                 list_del(&p->list);
1150                 kfree(p);
1151                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1152                         break;
1153         }
1154 }
1155
1156 static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
1157                              struct msghdr *msg, size_t len, int flags)
1158 {
1159         int noblock = flags & MSG_DONTWAIT;
1160         struct sock *sk = sock->sk;
1161         struct iucv_sock *iucv = iucv_sk(sk);
1162         unsigned int copied, rlen;
1163         struct sk_buff *skb, *rskb, *cskb;
1164         int err = 0;
1165
1166         if ((sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED) &&
1167             skb_queue_empty(&iucv->backlog_skb_q) &&
1168             skb_queue_empty(&sk->sk_receive_queue) &&
1169             list_empty(&iucv->message_q.list))
1170                 return 0;
1171
1172         if (flags & (MSG_OOB))
1173                 return -EOPNOTSUPP;
1174
1175         /* receive/dequeue next skb:
1176          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1177         skb = skb_recv_datagram(sk, flags, noblock, &err);
1178         if (!skb) {
1179                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1180                         return 0;
1181                 return err;
1182         }
1183
1184         rlen   = skb->len;              /* real length of skb */
1185         copied = min_t(unsigned int, rlen, len);
1186
1187         cskb = skb;
1188         if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) {
1189                 if (!(flags & MSG_PEEK))
1190                         skb_queue_head(&sk->sk_receive_queue, skb);
1191                 return -EFAULT;
1192         }
1193
1194         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1195         if (sk->sk_type == SOCK_SEQPACKET) {
1196                 if (copied < rlen)
1197                         msg->msg_flags |= MSG_TRUNC;
1198                 /* each iucv message contains a complete record */
1199                 msg->msg_flags |= MSG_EOR;
1200         }
1201
1202         /* create control message to store iucv msg target class:
1203          * get the trgcls from the control buffer of the skb due to
1204          * fragmentation of original iucv message. */
1205         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1206                         CB_TRGCLS_LEN, CB_TRGCLS(skb));
1207         if (err) {
1208                 if (!(flags & MSG_PEEK))
1209                         skb_queue_head(&sk->sk_receive_queue, skb);
1210                 return err;
1211         }
1212
1213         /* Mark read part of skb as used */
1214         if (!(flags & MSG_PEEK)) {
1215
1216                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1217                 if (sk->sk_type == SOCK_STREAM) {
1218                         skb_pull(skb, copied);
1219                         if (skb->len) {
1220                                 skb_queue_head(&sk->sk_receive_queue, skb);
1221                                 goto done;
1222                         }
1223                 }
1224
1225                 kfree_skb(skb);
1226
1227                 /* Queue backlog skbs */
1228                 spin_lock_bh(&iucv->message_q.lock);
1229                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1230                 while (rskb) {
1231                         if (sock_queue_rcv_skb(sk, rskb)) {
1232                                 skb_queue_head(&iucv->backlog_skb_q,
1233                                                 rskb);
1234                                 break;
1235                         } else {
1236                                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1237                         }
1238                 }
1239                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1240                         if (!list_empty(&iucv->message_q.list))
1241                                 iucv_process_message_q(sk);
1242                 }
1243                 spin_unlock_bh(&iucv->message_q.lock);
1244         }
1245
1246 done:
1247         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1248         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1249                 copied = rlen;
1250
1251         return copied;
1252 }
1253
1254 static inline unsigned int iucv_accept_poll(struct sock *parent)
1255 {
1256         struct iucv_sock *isk, *n;
1257         struct sock *sk;
1258
1259         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1260                 sk = (struct sock *) isk;
1261
1262                 if (sk->sk_state == IUCV_CONNECTED)
1263                         return POLLIN | POLLRDNORM;
1264         }
1265
1266         return 0;
1267 }
1268
1269 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1270                             poll_table *wait)
1271 {
1272         struct sock *sk = sock->sk;
1273         unsigned int mask = 0;
1274
1275         sock_poll_wait(file, sk_sleep(sk), wait);
1276
1277         if (sk->sk_state == IUCV_LISTEN)
1278                 return iucv_accept_poll(sk);
1279
1280         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1281                 mask |= POLLERR;
1282
1283         if (sk->sk_shutdown & RCV_SHUTDOWN)
1284                 mask |= POLLRDHUP;
1285
1286         if (sk->sk_shutdown == SHUTDOWN_MASK)
1287                 mask |= POLLHUP;
1288
1289         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1290             (sk->sk_shutdown & RCV_SHUTDOWN))
1291                 mask |= POLLIN | POLLRDNORM;
1292
1293         if (sk->sk_state == IUCV_CLOSED)
1294                 mask |= POLLHUP;
1295
1296         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_SEVERED)
1297                 mask |= POLLIN;
1298
1299         if (sock_writeable(sk))
1300                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1301         else
1302                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
1303
1304         return mask;
1305 }
1306
1307 static int iucv_sock_shutdown(struct socket *sock, int how)
1308 {
1309         struct sock *sk = sock->sk;
1310         struct iucv_sock *iucv = iucv_sk(sk);
1311         struct iucv_message txmsg;
1312         int err = 0;
1313
1314         how++;
1315
1316         if ((how & ~SHUTDOWN_MASK) || !how)
1317                 return -EINVAL;
1318
1319         lock_sock(sk);
1320         switch (sk->sk_state) {
1321         case IUCV_DISCONN:
1322         case IUCV_CLOSING:
1323         case IUCV_SEVERED:
1324         case IUCV_CLOSED:
1325                 err = -ENOTCONN;
1326                 goto fail;
1327
1328         default:
1329                 sk->sk_shutdown |= how;
1330                 break;
1331         }
1332
1333         if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) {
1334                 txmsg.class = 0;
1335                 txmsg.tag = 0;
1336                 err = iucv_message_send(iucv->path, &txmsg, IUCV_IPRMDATA, 0,
1337                                         (void *) iprm_shutdown, 8);
1338                 if (err) {
1339                         switch (err) {
1340                         case 1:
1341                                 err = -ENOTCONN;
1342                                 break;
1343                         case 2:
1344                                 err = -ECONNRESET;
1345                                 break;
1346                         default:
1347                                 err = -ENOTCONN;
1348                                 break;
1349                         }
1350                 }
1351         }
1352
1353         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1354                 err = iucv_path_quiesce(iucv_sk(sk)->path, NULL);
1355                 if (err)
1356                         err = -ENOTCONN;
1357
1358                 skb_queue_purge(&sk->sk_receive_queue);
1359         }
1360
1361         /* Wake up anyone sleeping in poll */
1362         sk->sk_state_change(sk);
1363
1364 fail:
1365         release_sock(sk);
1366         return err;
1367 }
1368
1369 static int iucv_sock_release(struct socket *sock)
1370 {
1371         struct sock *sk = sock->sk;
1372         int err = 0;
1373
1374         if (!sk)
1375                 return 0;
1376
1377         iucv_sock_close(sk);
1378
1379         /* Unregister with IUCV base support */
1380         if (iucv_sk(sk)->path) {
1381                 iucv_path_sever(iucv_sk(sk)->path, NULL);
1382                 iucv_path_free(iucv_sk(sk)->path);
1383                 iucv_sk(sk)->path = NULL;
1384         }
1385
1386         sock_orphan(sk);
1387         iucv_sock_kill(sk);
1388         return err;
1389 }
1390
1391 /* getsockopt and setsockopt */
1392 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1393                                 char __user *optval, unsigned int optlen)
1394 {
1395         struct sock *sk = sock->sk;
1396         struct iucv_sock *iucv = iucv_sk(sk);
1397         int val;
1398         int rc;
1399
1400         if (level != SOL_IUCV)
1401                 return -ENOPROTOOPT;
1402
1403         if (optlen < sizeof(int))
1404                 return -EINVAL;
1405
1406         if (get_user(val, (int __user *) optval))
1407                 return -EFAULT;
1408
1409         rc = 0;
1410
1411         lock_sock(sk);
1412         switch (optname) {
1413         case SO_IPRMDATA_MSG:
1414                 if (val)
1415                         iucv->flags |= IUCV_IPRMDATA;
1416                 else
1417                         iucv->flags &= ~IUCV_IPRMDATA;
1418                 break;
1419         case SO_MSGLIMIT:
1420                 switch (sk->sk_state) {
1421                 case IUCV_OPEN:
1422                 case IUCV_BOUND:
1423                         if (val < 1 || val > (u16)(~0))
1424                                 rc = -EINVAL;
1425                         else
1426                                 iucv->msglimit = val;
1427                         break;
1428                 default:
1429                         rc = -EINVAL;
1430                         break;
1431                 }
1432                 break;
1433         default:
1434                 rc = -ENOPROTOOPT;
1435                 break;
1436         }
1437         release_sock(sk);
1438
1439         return rc;
1440 }
1441
1442 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1443                                 char __user *optval, int __user *optlen)
1444 {
1445         struct sock *sk = sock->sk;
1446         struct iucv_sock *iucv = iucv_sk(sk);
1447         int val, len;
1448
1449         if (level != SOL_IUCV)
1450                 return -ENOPROTOOPT;
1451
1452         if (get_user(len, optlen))
1453                 return -EFAULT;
1454
1455         if (len < 0)
1456                 return -EINVAL;
1457
1458         len = min_t(unsigned int, len, sizeof(int));
1459
1460         switch (optname) {
1461         case SO_IPRMDATA_MSG:
1462                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1463                 break;
1464         case SO_MSGLIMIT:
1465                 lock_sock(sk);
1466                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1467                                            : iucv->msglimit;    /* default */
1468                 release_sock(sk);
1469                 break;
1470         default:
1471                 return -ENOPROTOOPT;
1472         }
1473
1474         if (put_user(len, optlen))
1475                 return -EFAULT;
1476         if (copy_to_user(optval, &val, len))
1477                 return -EFAULT;
1478
1479         return 0;
1480 }
1481
1482
1483 /* Callback wrappers - called from iucv base support */
1484 static int iucv_callback_connreq(struct iucv_path *path,
1485                                  u8 ipvmid[8], u8 ipuser[16])
1486 {
1487         unsigned char user_data[16];
1488         unsigned char nuser_data[16];
1489         unsigned char src_name[8];
1490         struct hlist_node *node;
1491         struct sock *sk, *nsk;
1492         struct iucv_sock *iucv, *niucv;
1493         int err;
1494
1495         memcpy(src_name, ipuser, 8);
1496         EBCASC(src_name, 8);
1497         /* Find out if this path belongs to af_iucv. */
1498         read_lock(&iucv_sk_list.lock);
1499         iucv = NULL;
1500         sk = NULL;
1501         sk_for_each(sk, node, &iucv_sk_list.head)
1502                 if (sk->sk_state == IUCV_LISTEN &&
1503                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1504                         /*
1505                          * Found a listening socket with
1506                          * src_name == ipuser[0-7].
1507                          */
1508                         iucv = iucv_sk(sk);
1509                         break;
1510                 }
1511         read_unlock(&iucv_sk_list.lock);
1512         if (!iucv)
1513                 /* No socket found, not one of our paths. */
1514                 return -EINVAL;
1515
1516         bh_lock_sock(sk);
1517
1518         /* Check if parent socket is listening */
1519         low_nmcpy(user_data, iucv->src_name);
1520         high_nmcpy(user_data, iucv->dst_name);
1521         ASCEBC(user_data, sizeof(user_data));
1522         if (sk->sk_state != IUCV_LISTEN) {
1523                 err = iucv_path_sever(path, user_data);
1524                 iucv_path_free(path);
1525                 goto fail;
1526         }
1527
1528         /* Check for backlog size */
1529         if (sk_acceptq_is_full(sk)) {
1530                 err = iucv_path_sever(path, user_data);
1531                 iucv_path_free(path);
1532                 goto fail;
1533         }
1534
1535         /* Create the new socket */
1536         nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC);
1537         if (!nsk) {
1538                 err = iucv_path_sever(path, user_data);
1539                 iucv_path_free(path);
1540                 goto fail;
1541         }
1542
1543         niucv = iucv_sk(nsk);
1544         iucv_sock_init(nsk, sk);
1545
1546         /* Set the new iucv_sock */
1547         memcpy(niucv->dst_name, ipuser + 8, 8);
1548         EBCASC(niucv->dst_name, 8);
1549         memcpy(niucv->dst_user_id, ipvmid, 8);
1550         memcpy(niucv->src_name, iucv->src_name, 8);
1551         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1552         niucv->path = path;
1553
1554         /* Call iucv_accept */
1555         high_nmcpy(nuser_data, ipuser + 8);
1556         memcpy(nuser_data + 8, niucv->src_name, 8);
1557         ASCEBC(nuser_data + 8, 8);
1558
1559         /* set message limit for path based on msglimit of accepting socket */
1560         niucv->msglimit = iucv->msglimit;
1561         path->msglim = iucv->msglimit;
1562         err = iucv_path_accept(path, &af_iucv_handler, nuser_data, nsk);
1563         if (err) {
1564                 err = iucv_path_sever(path, user_data);
1565                 iucv_path_free(path);
1566                 iucv_sock_kill(nsk);
1567                 goto fail;
1568         }
1569
1570         iucv_accept_enqueue(sk, nsk);
1571
1572         /* Wake up accept */
1573         nsk->sk_state = IUCV_CONNECTED;
1574         sk->sk_data_ready(sk, 1);
1575         err = 0;
1576 fail:
1577         bh_unlock_sock(sk);
1578         return 0;
1579 }
1580
1581 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1582 {
1583         struct sock *sk = path->private;
1584
1585         sk->sk_state = IUCV_CONNECTED;
1586         sk->sk_state_change(sk);
1587 }
1588
1589 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1590 {
1591         struct sock *sk = path->private;
1592         struct iucv_sock *iucv = iucv_sk(sk);
1593         struct sk_buff *skb;
1594         struct sock_msg_q *save_msg;
1595         int len;
1596
1597         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1598                 iucv_message_reject(path, msg);
1599                 return;
1600         }
1601
1602         spin_lock(&iucv->message_q.lock);
1603
1604         if (!list_empty(&iucv->message_q.list) ||
1605             !skb_queue_empty(&iucv->backlog_skb_q))
1606                 goto save_message;
1607
1608         len = atomic_read(&sk->sk_rmem_alloc);
1609         len += iucv_msg_length(msg) + sizeof(struct sk_buff);
1610         if (len > sk->sk_rcvbuf)
1611                 goto save_message;
1612
1613         skb = alloc_skb(iucv_msg_length(msg), GFP_ATOMIC | GFP_DMA);
1614         if (!skb)
1615                 goto save_message;
1616
1617         iucv_process_message(sk, skb, path, msg);
1618         goto out_unlock;
1619
1620 save_message:
1621         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1622         if (!save_msg)
1623                 return;
1624         save_msg->path = path;
1625         save_msg->msg = *msg;
1626
1627         list_add_tail(&save_msg->list, &iucv->message_q.list);
1628
1629 out_unlock:
1630         spin_unlock(&iucv->message_q.lock);
1631 }
1632
1633 static void iucv_callback_txdone(struct iucv_path *path,
1634                                  struct iucv_message *msg)
1635 {
1636         struct sock *sk = path->private;
1637         struct sk_buff *this = NULL;
1638         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1639         struct sk_buff *list_skb = list->next;
1640         unsigned long flags;
1641
1642         if (!skb_queue_empty(list)) {
1643                 spin_lock_irqsave(&list->lock, flags);
1644
1645                 while (list_skb != (struct sk_buff *)list) {
1646                         if (!memcmp(&msg->tag, CB_TAG(list_skb), CB_TAG_LEN)) {
1647                                 this = list_skb;
1648                                 break;
1649                         }
1650                         list_skb = list_skb->next;
1651                 }
1652                 if (this)
1653                         __skb_unlink(this, list);
1654
1655                 spin_unlock_irqrestore(&list->lock, flags);
1656
1657                 if (this) {
1658                         kfree_skb(this);
1659                         /* wake up any process waiting for sending */
1660                         iucv_sock_wake_msglim(sk);
1661                 }
1662         }
1663         BUG_ON(!this);
1664
1665         if (sk->sk_state == IUCV_CLOSING) {
1666                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1667                         sk->sk_state = IUCV_CLOSED;
1668                         sk->sk_state_change(sk);
1669                 }
1670         }
1671
1672 }
1673
1674 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1675 {
1676         struct sock *sk = path->private;
1677
1678         if (!list_empty(&iucv_sk(sk)->accept_q))
1679                 sk->sk_state = IUCV_SEVERED;
1680         else
1681                 sk->sk_state = IUCV_DISCONN;
1682
1683         sk->sk_state_change(sk);
1684 }
1685
1686 /* called if the other communication side shuts down its RECV direction;
1687  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1688  */
1689 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1690 {
1691         struct sock *sk = path->private;
1692
1693         bh_lock_sock(sk);
1694         if (sk->sk_state != IUCV_CLOSED) {
1695                 sk->sk_shutdown |= SEND_SHUTDOWN;
1696                 sk->sk_state_change(sk);
1697         }
1698         bh_unlock_sock(sk);
1699 }
1700
1701 static const struct proto_ops iucv_sock_ops = {
1702         .family         = PF_IUCV,
1703         .owner          = THIS_MODULE,
1704         .release        = iucv_sock_release,
1705         .bind           = iucv_sock_bind,
1706         .connect        = iucv_sock_connect,
1707         .listen         = iucv_sock_listen,
1708         .accept         = iucv_sock_accept,
1709         .getname        = iucv_sock_getname,
1710         .sendmsg        = iucv_sock_sendmsg,
1711         .recvmsg        = iucv_sock_recvmsg,
1712         .poll           = iucv_sock_poll,
1713         .ioctl          = sock_no_ioctl,
1714         .mmap           = sock_no_mmap,
1715         .socketpair     = sock_no_socketpair,
1716         .shutdown       = iucv_sock_shutdown,
1717         .setsockopt     = iucv_sock_setsockopt,
1718         .getsockopt     = iucv_sock_getsockopt,
1719 };
1720
1721 static const struct net_proto_family iucv_sock_family_ops = {
1722         .family = AF_IUCV,
1723         .owner  = THIS_MODULE,
1724         .create = iucv_sock_create,
1725 };
1726
1727 static int __init afiucv_init(void)
1728 {
1729         int err;
1730
1731         if (!MACHINE_IS_VM) {
1732                 pr_err("The af_iucv module cannot be loaded"
1733                        " without z/VM\n");
1734                 err = -EPROTONOSUPPORT;
1735                 goto out;
1736         }
1737         cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
1738         if (unlikely(err)) {
1739                 WARN_ON(err);
1740                 err = -EPROTONOSUPPORT;
1741                 goto out;
1742         }
1743
1744         err = iucv_register(&af_iucv_handler, 0);
1745         if (err)
1746                 goto out;
1747         err = proto_register(&iucv_proto, 0);
1748         if (err)
1749                 goto out_iucv;
1750         err = sock_register(&iucv_sock_family_ops);
1751         if (err)
1752                 goto out_proto;
1753         /* establish dummy device */
1754         err = driver_register(&af_iucv_driver);
1755         if (err)
1756                 goto out_sock;
1757         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
1758         if (!af_iucv_dev) {
1759                 err = -ENOMEM;
1760                 goto out_driver;
1761         }
1762         dev_set_name(af_iucv_dev, "af_iucv");
1763         af_iucv_dev->bus = &iucv_bus;
1764         af_iucv_dev->parent = iucv_root;
1765         af_iucv_dev->release = (void (*)(struct device *))kfree;
1766         af_iucv_dev->driver = &af_iucv_driver;
1767         err = device_register(af_iucv_dev);
1768         if (err)
1769                 goto out_driver;
1770
1771         return 0;
1772
1773 out_driver:
1774         driver_unregister(&af_iucv_driver);
1775 out_sock:
1776         sock_unregister(PF_IUCV);
1777 out_proto:
1778         proto_unregister(&iucv_proto);
1779 out_iucv:
1780         iucv_unregister(&af_iucv_handler, 0);
1781 out:
1782         return err;
1783 }
1784
1785 static void __exit afiucv_exit(void)
1786 {
1787         device_unregister(af_iucv_dev);
1788         driver_unregister(&af_iucv_driver);
1789         sock_unregister(PF_IUCV);
1790         proto_unregister(&iucv_proto);
1791         iucv_unregister(&af_iucv_handler, 0);
1792 }
1793
1794 module_init(afiucv_init);
1795 module_exit(afiucv_exit);
1796
1797 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
1798 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
1799 MODULE_VERSION(VERSION);
1800 MODULE_LICENSE("GPL");
1801 MODULE_ALIAS_NETPROTO(PF_IUCV);