net/iucv/af_iucv.c

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