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/signal.h>
  21 #include <linux/slab.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/init.h>
  24 #include <linux/poll.h>
  25 #include <linux/security.h>
  26 #include <net/sock.h>
  27 #include <asm/ebcdic.h>
  28 #include <asm/cpcmd.h>
  29 #include <linux/kmod.h>
  30
  31 #include <net/iucv/af_iucv.h>
  32
  33 #define VERSION "1.2"
  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 static struct iucv_interface *pr_iucv;
  46
  47 /* special AF_IUCV IPRM messages */
  48 static const u8 iprm_shutdown[8] =
  49         {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01};
  50
  51 #define TRGCLS_SIZE     (sizeof(((struct iucv_message *)0)->class))
  52
  53 #define __iucv_sock_wait(sk, condition, timeo, ret)                     \
  54 do {                                                                    \
  55         DEFINE_WAIT(__wait);                                            \
  56         long __timeo = timeo;                                           \
  57         ret = 0;                                                        \
  58         prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE);     \
  59         while (!(condition)) {                                          \
  60                 if (!__timeo) {                                         \
  61                         ret = -EAGAIN;                                  \
  62                         break;                                          \
  63                 }                                                       \
  64                 if (signal_pending(current)) {                          \
  65                         ret = sock_intr_errno(__timeo);                 \
  66                         break;                                          \
  67                 }                                                       \
  68                 release_sock(sk);                                       \
  69                 __timeo = schedule_timeout(__timeo);                    \
  70                 lock_sock(sk);                                          \
  71                 ret = sock_error(sk);                                   \
  72                 if (ret)                                                \
  73                         break;                                          \
  74         }                                                               \
  75         finish_wait(sk_sleep(sk), &__wait);                             \
  76 } while (0)
  77
  78 #define iucv_sock_wait(sk, condition, timeo)                            \
  79 ({                                                                      \
  80         int __ret = 0;                                                  \
  81         if (!(condition))                                               \
  82                 __iucv_sock_wait(sk, condition, timeo, __ret);          \
  83         __ret;                                                          \
  84 })
  85
  86 static void iucv_sock_kill(struct sock *sk);
  87 static void iucv_sock_close(struct sock *sk);
  88 static void iucv_sever_path(struct sock *, int);
  89
  90 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
  91         struct packet_type *pt, struct net_device *orig_dev);
  92 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
  93                    struct sk_buff *skb, u8 flags);
  94 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify);
  95
  96 /* Call Back functions */
  97 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *);
  98 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *);
  99 static void iucv_callback_connack(struct iucv_path *, u8 *);
 100 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *);
 101 static void iucv_callback_connrej(struct iucv_path *, u8 *);
 102 static void iucv_callback_shutdown(struct iucv_path *, u8 *);
 103
 104 static struct iucv_sock_list iucv_sk_list = {
 105         .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock),
 106         .autobind_name = ATOMIC_INIT(0)
 107 };
 108
 109 static struct iucv_handler af_iucv_handler = {
 110         .path_pending     = iucv_callback_connreq,
 111         .path_complete    = iucv_callback_connack,
 112         .path_severed     = iucv_callback_connrej,
 113         .message_pending  = iucv_callback_rx,
 114         .message_complete = iucv_callback_txdone,
 115         .path_quiesced    = iucv_callback_shutdown,
 116 };
 117
 118 static inline void high_nmcpy(unsigned char *dst, char *src)
 119 {
 120        memcpy(dst, src, 8);
 121 }
 122
 123 static inline void low_nmcpy(unsigned char *dst, char *src)
 124 {
 125        memcpy(&dst[8], src, 8);
 126 }
 127
 128 static int afiucv_pm_prepare(struct device *dev)
 129 {
 130 #ifdef CONFIG_PM_DEBUG
 131         printk(KERN_WARNING "afiucv_pm_prepare\n");
 132 #endif
 133         return 0;
 134 }
 135
 136 static void afiucv_pm_complete(struct device *dev)
 137 {
 138 #ifdef CONFIG_PM_DEBUG
 139         printk(KERN_WARNING "afiucv_pm_complete\n");
 140 #endif
 141 }
 142
 143 /**
 144  * afiucv_pm_freeze() - Freeze PM callback
 145  * @dev:        AFIUCV dummy device
 146  *
 147  * Sever all established IUCV communication pathes
 148  */
 149 static int afiucv_pm_freeze(struct device *dev)
 150 {
 151         struct iucv_sock *iucv;
 152         struct sock *sk;
 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, &iucv_sk_list.head) {
 160                 iucv = iucv_sk(sk);
 161                 switch (sk->sk_state) {
 162                 case IUCV_DISCONN:
 163                 case IUCV_CLOSING:
 164                 case IUCV_CONNECTED:
 165                         iucv_sever_path(sk, 0);
 166                         break;
 167                 case IUCV_OPEN:
 168                 case IUCV_BOUND:
 169                 case IUCV_LISTEN:
 170                 case IUCV_CLOSED:
 171                 default:
 172                         break;
 173                 }
 174                 skb_queue_purge(&iucv->send_skb_q);
 175                 skb_queue_purge(&iucv->backlog_skb_q);
 176         }
 177         read_unlock(&iucv_sk_list.lock);
 178         return err;
 179 }
 180
 181 /**
 182  * afiucv_pm_restore_thaw() - Thaw and restore PM callback
 183  * @dev:        AFIUCV dummy device
 184  *
 185  * socket clean up after freeze
 186  */
 187 static int afiucv_pm_restore_thaw(struct device *dev)
 188 {
 189         struct sock *sk;
 190
 191 #ifdef CONFIG_PM_DEBUG
 192         printk(KERN_WARNING "afiucv_pm_restore_thaw\n");
 193 #endif
 194         read_lock(&iucv_sk_list.lock);
 195         sk_for_each(sk, &iucv_sk_list.head) {
 196                 switch (sk->sk_state) {
 197                 case IUCV_CONNECTED:
 198                         sk->sk_err = EPIPE;
 199                         sk->sk_state = IUCV_DISCONN;
 200                         sk->sk_state_change(sk);
 201                         break;
 202                 case IUCV_DISCONN:
 203                 case IUCV_CLOSING:
 204                 case IUCV_LISTEN:
 205                 case IUCV_BOUND:
 206                 case IUCV_OPEN:
 207                 default:
 208                         break;
 209                 }
 210         }
 211         read_unlock(&iucv_sk_list.lock);
 212         return 0;
 213 }
 214
 215 static const struct dev_pm_ops afiucv_pm_ops = {
 216         .prepare = afiucv_pm_prepare,
 217         .complete = afiucv_pm_complete,
 218         .freeze = afiucv_pm_freeze,
 219         .thaw = afiucv_pm_restore_thaw,
 220         .restore = afiucv_pm_restore_thaw,
 221 };
 222
 223 static struct device_driver af_iucv_driver = {
 224         .owner = THIS_MODULE,
 225         .name = "afiucv",
 226         .bus  = NULL,
 227         .pm   = &afiucv_pm_ops,
 228 };
 229
 230 /* dummy device used as trigger for PM functions */
 231 static struct device *af_iucv_dev;
 232
 233 /**
 234  * iucv_msg_length() - Returns the length of an iucv message.
 235  * @msg:        Pointer to struct iucv_message, MUST NOT be NULL
 236  *
 237  * The function returns the length of the specified iucv message @msg of data
 238  * stored in a buffer and of data stored in the parameter list (PRMDATA).
 239  *
 240  * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket
 241  * data:
 242  *      PRMDATA[0..6]   socket data (max 7 bytes);
 243  *      PRMDATA[7]      socket data length value (len is 0xff - PRMDATA[7])
 244  *
 245  * The socket data length is computed by subtracting the socket data length
 246  * value from 0xFF.
 247  * If the socket data len is greater 7, then PRMDATA can be used for special
 248  * notifications (see iucv_sock_shutdown); and further,
 249  * if the socket data len is > 7, the function returns 8.
 250  *
 251  * Use this function to allocate socket buffers to store iucv message data.
 252  */
 253 static inline size_t iucv_msg_length(struct iucv_message *msg)
 254 {
 255         size_t datalen;
 256
 257         if (msg->flags & IUCV_IPRMDATA) {
 258                 datalen = 0xff - msg->rmmsg[7];
 259                 return (datalen < 8) ? datalen : 8;
 260         }
 261         return msg->length;
 262 }
 263
 264 /**
 265  * iucv_sock_in_state() - check for specific states
 266  * @sk:         sock structure
 267  * @state:      first iucv sk state
 268  * @state:      second iucv sk state
 269  *
 270  * Returns true if the socket in either in the first or second state.
 271  */
 272 static int iucv_sock_in_state(struct sock *sk, int state, int state2)
 273 {
 274         return (sk->sk_state == state || sk->sk_state == state2);
 275 }
 276
 277 /**
 278  * iucv_below_msglim() - function to check if messages can be sent
 279  * @sk:         sock structure
 280  *
 281  * Returns true if the send queue length is lower than the message limit.
 282  * Always returns true if the socket is not connected (no iucv path for
 283  * checking the message limit).
 284  */
 285 static inline int iucv_below_msglim(struct sock *sk)
 286 {
 287         struct iucv_sock *iucv = iucv_sk(sk);
 288
 289         if (sk->sk_state != IUCV_CONNECTED)
 290                 return 1;
 291         if (iucv->transport == AF_IUCV_TRANS_IUCV)
 292                 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
 293         else
 294                 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) &&
 295                         (atomic_read(&iucv->pendings) <= 0));
 296 }
 297
 298 /**
 299  * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
 300  */
 301 static void iucv_sock_wake_msglim(struct sock *sk)
 302 {
 303         struct socket_wq *wq;
 304
 305         rcu_read_lock();
 306         wq = rcu_dereference(sk->sk_wq);
 307         if (skwq_has_sleeper(wq))
 308                 wake_up_interruptible_all(&wq->wait);
 309         sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
 310         rcu_read_unlock();
 311 }
 312
 313 /**
 314  * afiucv_hs_send() - send a message through HiperSockets transport
 315  */
 316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock,
 317                    struct sk_buff *skb, u8 flags)
 318 {
 319         struct iucv_sock *iucv = iucv_sk(sock);
 320         struct af_iucv_trans_hdr *phs_hdr;
 321         struct sk_buff *nskb;
 322         int err, confirm_recv = 0;
 323
 324         memset(skb->head, 0, ETH_HLEN);
 325         phs_hdr = skb_push(skb, sizeof(struct af_iucv_trans_hdr));
 326         skb_reset_mac_header(skb);
 327         skb_reset_network_header(skb);
 328         skb_push(skb, ETH_HLEN);
 329         skb_reset_mac_header(skb);
 330         memset(phs_hdr, 0, sizeof(struct af_iucv_trans_hdr));
 331
 332         phs_hdr->magic = ETH_P_AF_IUCV;
 333         phs_hdr->version = 1;
 334         phs_hdr->flags = flags;
 335         if (flags == AF_IUCV_FLAG_SYN)
 336                 phs_hdr->window = iucv->msglimit;
 337         else if ((flags == AF_IUCV_FLAG_WIN) || !flags) {
 338                 confirm_recv = atomic_read(&iucv->msg_recv);
 339                 phs_hdr->window = confirm_recv;
 340                 if (confirm_recv)
 341                         phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN;
 342         }
 343         memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8);
 344         memcpy(phs_hdr->destAppName, iucv->dst_name, 8);
 345         memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8);
 346         memcpy(phs_hdr->srcAppName, iucv->src_name, 8);
 347         ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID));
 348         ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName));
 349         ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID));
 350         ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName));
 351         if (imsg)
 352                 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message));
 353
 354         skb->dev = iucv->hs_dev;
 355         if (!skb->dev)
 356                 return -ENODEV;
 357         if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev))
 358                 return -ENETDOWN;
 359         if (skb->len > skb->dev->mtu) {
 360                 if (sock->sk_type == SOCK_SEQPACKET)
 361                         return -EMSGSIZE;
 362                 else
 363                         skb_trim(skb, skb->dev->mtu);
 364         }
 365         skb->protocol = cpu_to_be16(ETH_P_AF_IUCV);
 366         nskb = skb_clone(skb, GFP_ATOMIC);
 367         if (!nskb)
 368                 return -ENOMEM;
 369         skb_queue_tail(&iucv->send_skb_q, nskb);
 370         err = dev_queue_xmit(skb);
 371         if (net_xmit_eval(err)) {
 372                 skb_unlink(nskb, &iucv->send_skb_q);
 373                 kfree_skb(nskb);
 374         } else {
 375                 atomic_sub(confirm_recv, &iucv->msg_recv);
 376                 WARN_ON(atomic_read(&iucv->msg_recv) < 0);
 377         }
 378         return net_xmit_eval(err);
 379 }
 380
 381 static struct sock *__iucv_get_sock_by_name(char *nm)
 382 {
 383         struct sock *sk;
 384
 385         sk_for_each(sk, &iucv_sk_list.head)
 386                 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8))
 387                         return sk;
 388
 389         return NULL;
 390 }
 391
 392 static void iucv_sock_destruct(struct sock *sk)
 393 {
 394         skb_queue_purge(&sk->sk_receive_queue);
 395         skb_queue_purge(&sk->sk_error_queue);
 396
 397         sk_mem_reclaim(sk);
 398
 399         if (!sock_flag(sk, SOCK_DEAD)) {
 400                 pr_err("Attempt to release alive iucv socket %p\n", sk);
 401                 return;
 402         }
 403
 404         WARN_ON(atomic_read(&sk->sk_rmem_alloc));
 405         WARN_ON(refcount_read(&sk->sk_wmem_alloc));
 406         WARN_ON(sk->sk_wmem_queued);
 407         WARN_ON(sk->sk_forward_alloc);
 408 }
 409
 410 /* Cleanup Listen */
 411 static void iucv_sock_cleanup_listen(struct sock *parent)
 412 {
 413         struct sock *sk;
 414
 415         /* Close non-accepted connections */
 416         while ((sk = iucv_accept_dequeue(parent, NULL))) {
 417                 iucv_sock_close(sk);
 418                 iucv_sock_kill(sk);
 419         }
 420
 421         parent->sk_state = IUCV_CLOSED;
 422 }
 423
 424 /* Kill socket (only if zapped and orphaned) */
 425 static void iucv_sock_kill(struct sock *sk)
 426 {
 427         if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket)
 428                 return;
 429
 430         iucv_sock_unlink(&iucv_sk_list, sk);
 431         sock_set_flag(sk, SOCK_DEAD);
 432         sock_put(sk);
 433 }
 434
 435 /* Terminate an IUCV path */
 436 static void iucv_sever_path(struct sock *sk, int with_user_data)
 437 {
 438         unsigned char user_data[16];
 439         struct iucv_sock *iucv = iucv_sk(sk);
 440         struct iucv_path *path = iucv->path;
 441
 442         if (iucv->path) {
 443                 iucv->path = NULL;
 444                 if (with_user_data) {
 445                         low_nmcpy(user_data, iucv->src_name);
 446                         high_nmcpy(user_data, iucv->dst_name);
 447                         ASCEBC(user_data, sizeof(user_data));
 448                         pr_iucv->path_sever(path, user_data);
 449                 } else
 450                         pr_iucv->path_sever(path, NULL);
 451                 iucv_path_free(path);
 452         }
 453 }
 454
 455 /* Send controlling flags through an IUCV socket for HIPER transport */
 456 static int iucv_send_ctrl(struct sock *sk, u8 flags)
 457 {
 458         int err = 0;
 459         int blen;
 460         struct sk_buff *skb;
 461         u8 shutdown = 0;
 462
 463         blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
 464         if (sk->sk_shutdown & SEND_SHUTDOWN) {
 465                 /* controlling flags should be sent anyway */
 466                 shutdown = sk->sk_shutdown;
 467                 sk->sk_shutdown &= RCV_SHUTDOWN;
 468         }
 469         skb = sock_alloc_send_skb(sk, blen, 1, &err);
 470         if (skb) {
 471                 skb_reserve(skb, blen);
 472                 err = afiucv_hs_send(NULL, sk, skb, flags);
 473         }
 474         if (shutdown)
 475                 sk->sk_shutdown = shutdown;
 476         return err;
 477 }
 478
 479 /* Close an IUCV socket */
 480 static void iucv_sock_close(struct sock *sk)
 481 {
 482         struct iucv_sock *iucv = iucv_sk(sk);
 483         unsigned long timeo;
 484         int err = 0;
 485
 486         lock_sock(sk);
 487
 488         switch (sk->sk_state) {
 489         case IUCV_LISTEN:
 490                 iucv_sock_cleanup_listen(sk);
 491                 break;
 492
 493         case IUCV_CONNECTED:
 494                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
 495                         err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
 496                         sk->sk_state = IUCV_DISCONN;
 497                         sk->sk_state_change(sk);
 498                 }
 499         case IUCV_DISCONN:   /* fall through */
 500                 sk->sk_state = IUCV_CLOSING;
 501                 sk->sk_state_change(sk);
 502
 503                 if (!err && !skb_queue_empty(&iucv->send_skb_q)) {
 504                         if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
 505                                 timeo = sk->sk_lingertime;
 506                         else
 507                                 timeo = IUCV_DISCONN_TIMEOUT;
 508                         iucv_sock_wait(sk,
 509                                         iucv_sock_in_state(sk, IUCV_CLOSED, 0),
 510                                         timeo);
 511                 }
 512
 513         case IUCV_CLOSING:   /* fall through */
 514                 sk->sk_state = IUCV_CLOSED;
 515                 sk->sk_state_change(sk);
 516
 517                 sk->sk_err = ECONNRESET;
 518                 sk->sk_state_change(sk);
 519
 520                 skb_queue_purge(&iucv->send_skb_q);
 521                 skb_queue_purge(&iucv->backlog_skb_q);
 522
 523         default:   /* fall through */
 524                 iucv_sever_path(sk, 1);
 525         }
 526
 527         if (iucv->hs_dev) {
 528                 dev_put(iucv->hs_dev);
 529                 iucv->hs_dev = NULL;
 530                 sk->sk_bound_dev_if = 0;
 531         }
 532
 533         /* mark socket for deletion by iucv_sock_kill() */
 534         sock_set_flag(sk, SOCK_ZAPPED);
 535
 536         release_sock(sk);
 537 }
 538
 539 static void iucv_sock_init(struct sock *sk, struct sock *parent)
 540 {
 541         if (parent) {
 542                 sk->sk_type = parent->sk_type;
 543                 security_sk_clone(parent, sk);
 544         }
 545 }
 546
 547 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern)
 548 {
 549         struct sock *sk;
 550         struct iucv_sock *iucv;
 551
 552         sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern);
 553         if (!sk)
 554                 return NULL;
 555         iucv = iucv_sk(sk);
 556
 557         sock_init_data(sock, sk);
 558         INIT_LIST_HEAD(&iucv->accept_q);
 559         spin_lock_init(&iucv->accept_q_lock);
 560         skb_queue_head_init(&iucv->send_skb_q);
 561         INIT_LIST_HEAD(&iucv->message_q.list);
 562         spin_lock_init(&iucv->message_q.lock);
 563         skb_queue_head_init(&iucv->backlog_skb_q);
 564         iucv->send_tag = 0;
 565         atomic_set(&iucv->pendings, 0);
 566         iucv->flags = 0;
 567         iucv->msglimit = 0;
 568         atomic_set(&iucv->msg_sent, 0);
 569         atomic_set(&iucv->msg_recv, 0);
 570         iucv->path = NULL;
 571         iucv->sk_txnotify = afiucv_hs_callback_txnotify;
 572         memset(&iucv->src_user_id , 0, 32);
 573         if (pr_iucv)
 574                 iucv->transport = AF_IUCV_TRANS_IUCV;
 575         else
 576                 iucv->transport = AF_IUCV_TRANS_HIPER;
 577
 578         sk->sk_destruct = iucv_sock_destruct;
 579         sk->sk_sndtimeo = IUCV_CONN_TIMEOUT;
 580         sk->sk_allocation = GFP_DMA;
 581
 582         sock_reset_flag(sk, SOCK_ZAPPED);
 583
 584         sk->sk_protocol = proto;
 585         sk->sk_state    = IUCV_OPEN;
 586
 587         iucv_sock_link(&iucv_sk_list, sk);
 588         return sk;
 589 }
 590
 591 /* Create an IUCV socket */
 592 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol,
 593                             int kern)
 594 {
 595         struct sock *sk;
 596
 597         if (protocol && protocol != PF_IUCV)
 598                 return -EPROTONOSUPPORT;
 599
 600         sock->state = SS_UNCONNECTED;
 601
 602         switch (sock->type) {
 603         case SOCK_STREAM:
 604                 sock->ops = &iucv_sock_ops;
 605                 break;
 606         case SOCK_SEQPACKET:
 607                 /* currently, proto ops can handle both sk types */
 608                 sock->ops = &iucv_sock_ops;
 609                 break;
 610         default:
 611                 return -ESOCKTNOSUPPORT;
 612         }
 613
 614         sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern);
 615         if (!sk)
 616                 return -ENOMEM;
 617
 618         iucv_sock_init(sk, NULL);
 619
 620         return 0;
 621 }
 622
 623 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk)
 624 {
 625         write_lock_bh(&l->lock);
 626         sk_add_node(sk, &l->head);
 627         write_unlock_bh(&l->lock);
 628 }
 629
 630 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk)
 631 {
 632         write_lock_bh(&l->lock);
 633         sk_del_node_init(sk);
 634         write_unlock_bh(&l->lock);
 635 }
 636
 637 void iucv_accept_enqueue(struct sock *parent, struct sock *sk)
 638 {
 639         unsigned long flags;
 640         struct iucv_sock *par = iucv_sk(parent);
 641
 642         sock_hold(sk);
 643         spin_lock_irqsave(&par->accept_q_lock, flags);
 644         list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q);
 645         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 646         iucv_sk(sk)->parent = parent;
 647         sk_acceptq_added(parent);
 648 }
 649
 650 void iucv_accept_unlink(struct sock *sk)
 651 {
 652         unsigned long flags;
 653         struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent);
 654
 655         spin_lock_irqsave(&par->accept_q_lock, flags);
 656         list_del_init(&iucv_sk(sk)->accept_q);
 657         spin_unlock_irqrestore(&par->accept_q_lock, flags);
 658         sk_acceptq_removed(iucv_sk(sk)->parent);
 659         iucv_sk(sk)->parent = NULL;
 660         sock_put(sk);
 661 }
 662
 663 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
 664 {
 665         struct iucv_sock *isk, *n;
 666         struct sock *sk;
 667
 668         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
 669                 sk = (struct sock *) isk;
 670                 lock_sock(sk);
 671
 672                 if (sk->sk_state == IUCV_CLOSED) {
 673                         iucv_accept_unlink(sk);
 674                         release_sock(sk);
 675                         continue;
 676                 }
 677
 678                 if (sk->sk_state == IUCV_CONNECTED ||
 679                     sk->sk_state == IUCV_DISCONN ||
 680                     !newsock) {
 681                         iucv_accept_unlink(sk);
 682                         if (newsock)
 683                                 sock_graft(sk, newsock);
 684
 685                         release_sock(sk);
 686                         return sk;
 687                 }
 688
 689                 release_sock(sk);
 690         }
 691         return NULL;
 692 }
 693
 694 static void __iucv_auto_name(struct iucv_sock *iucv)
 695 {
 696         char name[12];
 697
 698         sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name));
 699         while (__iucv_get_sock_by_name(name)) {
 700                 sprintf(name, "%08x",
 701                         atomic_inc_return(&iucv_sk_list.autobind_name));
 702         }
 703         memcpy(iucv->src_name, name, 8);
 704 }
 705
 706 /* Bind an unbound socket */
 707 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
 708                           int addr_len)
 709 {
 710         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 711         struct sock *sk = sock->sk;
 712         struct iucv_sock *iucv;
 713         int err = 0;
 714         struct net_device *dev;
 715         char uid[9];
 716
 717         /* Verify the input sockaddr */
 718         if (addr_len < sizeof(struct sockaddr_iucv) ||
 719             addr->sa_family != AF_IUCV)
 720                 return -EINVAL;
 721
 722         lock_sock(sk);
 723         if (sk->sk_state != IUCV_OPEN) {
 724                 err = -EBADFD;
 725                 goto done;
 726         }
 727
 728         write_lock_bh(&iucv_sk_list.lock);
 729
 730         iucv = iucv_sk(sk);
 731         if (__iucv_get_sock_by_name(sa->siucv_name)) {
 732                 err = -EADDRINUSE;
 733                 goto done_unlock;
 734         }
 735         if (iucv->path)
 736                 goto done_unlock;
 737
 738         /* Bind the socket */
 739         if (pr_iucv)
 740                 if (!memcmp(sa->siucv_user_id, iucv_userid, 8))
 741                         goto vm_bind; /* VM IUCV transport */
 742
 743         /* try hiper transport */
 744         memcpy(uid, sa->siucv_user_id, sizeof(uid));
 745         ASCEBC(uid, 8);
 746         rcu_read_lock();
 747         for_each_netdev_rcu(&init_net, dev) {
 748                 if (!memcmp(dev->perm_addr, uid, 8)) {
 749                         memcpy(iucv->src_user_id, sa->siucv_user_id, 8);
 750                         /* Check for unitialized siucv_name */
 751                         if (strncmp(sa->siucv_name, "        ", 8) == 0)
 752                                 __iucv_auto_name(iucv);
 753                         else
 754                                 memcpy(iucv->src_name, sa->siucv_name, 8);
 755                         sk->sk_bound_dev_if = dev->ifindex;
 756                         iucv->hs_dev = dev;
 757                         dev_hold(dev);
 758                         sk->sk_state = IUCV_BOUND;
 759                         iucv->transport = AF_IUCV_TRANS_HIPER;
 760                         if (!iucv->msglimit)
 761                                 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT;
 762                         rcu_read_unlock();
 763                         goto done_unlock;
 764                 }
 765         }
 766         rcu_read_unlock();
 767 vm_bind:
 768         if (pr_iucv) {
 769                 /* use local userid for backward compat */
 770                 memcpy(iucv->src_name, sa->siucv_name, 8);
 771                 memcpy(iucv->src_user_id, iucv_userid, 8);
 772                 sk->sk_state = IUCV_BOUND;
 773                 iucv->transport = AF_IUCV_TRANS_IUCV;
 774                 if (!iucv->msglimit)
 775                         iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 776                 goto done_unlock;
 777         }
 778         /* found no dev to bind */
 779         err = -ENODEV;
 780 done_unlock:
 781         /* Release the socket list lock */
 782         write_unlock_bh(&iucv_sk_list.lock);
 783 done:
 784         release_sock(sk);
 785         return err;
 786 }
 787
 788 /* Automatically bind an unbound socket */
 789 static int iucv_sock_autobind(struct sock *sk)
 790 {
 791         struct iucv_sock *iucv = iucv_sk(sk);
 792         int err = 0;
 793
 794         if (unlikely(!pr_iucv))
 795                 return -EPROTO;
 796
 797         memcpy(iucv->src_user_id, iucv_userid, 8);
 798
 799         write_lock_bh(&iucv_sk_list.lock);
 800         __iucv_auto_name(iucv);
 801         write_unlock_bh(&iucv_sk_list.lock);
 802
 803         if (!iucv->msglimit)
 804                 iucv->msglimit = IUCV_QUEUELEN_DEFAULT;
 805
 806         return err;
 807 }
 808
 809 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr)
 810 {
 811         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 812         struct sock *sk = sock->sk;
 813         struct iucv_sock *iucv = iucv_sk(sk);
 814         unsigned char user_data[16];
 815         int err;
 816
 817         high_nmcpy(user_data, sa->siucv_name);
 818         low_nmcpy(user_data, iucv->src_name);
 819         ASCEBC(user_data, sizeof(user_data));
 820
 821         /* Create path. */
 822         iucv->path = iucv_path_alloc(iucv->msglimit,
 823                                      IUCV_IPRMDATA, GFP_KERNEL);
 824         if (!iucv->path) {
 825                 err = -ENOMEM;
 826                 goto done;
 827         }
 828         err = pr_iucv->path_connect(iucv->path, &af_iucv_handler,
 829                                     sa->siucv_user_id, NULL, user_data,
 830                                     sk);
 831         if (err) {
 832                 iucv_path_free(iucv->path);
 833                 iucv->path = NULL;
 834                 switch (err) {
 835                 case 0x0b:      /* Target communicator is not logged on */
 836                         err = -ENETUNREACH;
 837                         break;
 838                 case 0x0d:      /* Max connections for this guest exceeded */
 839                 case 0x0e:      /* Max connections for target guest exceeded */
 840                         err = -EAGAIN;
 841                         break;
 842                 case 0x0f:      /* Missing IUCV authorization */
 843                         err = -EACCES;
 844                         break;
 845                 default:
 846                         err = -ECONNREFUSED;
 847                         break;
 848                 }
 849         }
 850 done:
 851         return err;
 852 }
 853
 854 /* Connect an unconnected socket */
 855 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
 856                              int alen, int flags)
 857 {
 858         struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr;
 859         struct sock *sk = sock->sk;
 860         struct iucv_sock *iucv = iucv_sk(sk);
 861         int err;
 862
 863         if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV)
 864                 return -EINVAL;
 865
 866         if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND)
 867                 return -EBADFD;
 868
 869         if (sk->sk_state == IUCV_OPEN &&
 870             iucv->transport == AF_IUCV_TRANS_HIPER)
 871                 return -EBADFD; /* explicit bind required */
 872
 873         if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET)
 874                 return -EINVAL;
 875
 876         if (sk->sk_state == IUCV_OPEN) {
 877                 err = iucv_sock_autobind(sk);
 878                 if (unlikely(err))
 879                         return err;
 880         }
 881
 882         lock_sock(sk);
 883
 884         /* Set the destination information */
 885         memcpy(iucv->dst_user_id, sa->siucv_user_id, 8);
 886         memcpy(iucv->dst_name, sa->siucv_name, 8);
 887
 888         if (iucv->transport == AF_IUCV_TRANS_HIPER)
 889                 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN);
 890         else
 891                 err = afiucv_path_connect(sock, addr);
 892         if (err)
 893                 goto done;
 894
 895         if (sk->sk_state != IUCV_CONNECTED)
 896                 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
 897                                                             IUCV_DISCONN),
 898                                      sock_sndtimeo(sk, flags & O_NONBLOCK));
 899
 900         if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED)
 901                 err = -ECONNREFUSED;
 902
 903         if (err && iucv->transport == AF_IUCV_TRANS_IUCV)
 904                 iucv_sever_path(sk, 0);
 905
 906 done:
 907         release_sock(sk);
 908         return err;
 909 }
 910
 911 /* Move a socket into listening state. */
 912 static int iucv_sock_listen(struct socket *sock, int backlog)
 913 {
 914         struct sock *sk = sock->sk;
 915         int err;
 916
 917         lock_sock(sk);
 918
 919         err = -EINVAL;
 920         if (sk->sk_state != IUCV_BOUND)
 921                 goto done;
 922
 923         if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
 924                 goto done;
 925
 926         sk->sk_max_ack_backlog = backlog;
 927         sk->sk_ack_backlog = 0;
 928         sk->sk_state = IUCV_LISTEN;
 929         err = 0;
 930
 931 done:
 932         release_sock(sk);
 933         return err;
 934 }
 935
 936 /* Accept a pending connection */
 937 static int iucv_sock_accept(struct socket *sock, struct socket *newsock,
 938                             int flags, bool kern)
 939 {
 940         DECLARE_WAITQUEUE(wait, current);
 941         struct sock *sk = sock->sk, *nsk;
 942         long timeo;
 943         int err = 0;
 944
 945         lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 946
 947         if (sk->sk_state != IUCV_LISTEN) {
 948                 err = -EBADFD;
 949                 goto done;
 950         }
 951
 952         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
 953
 954         /* Wait for an incoming connection */
 955         add_wait_queue_exclusive(sk_sleep(sk), &wait);
 956         while (!(nsk = iucv_accept_dequeue(sk, newsock))) {
 957                 set_current_state(TASK_INTERRUPTIBLE);
 958                 if (!timeo) {
 959                         err = -EAGAIN;
 960                         break;
 961                 }
 962
 963                 release_sock(sk);
 964                 timeo = schedule_timeout(timeo);
 965                 lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
 966
 967                 if (sk->sk_state != IUCV_LISTEN) {
 968                         err = -EBADFD;
 969                         break;
 970                 }
 971
 972                 if (signal_pending(current)) {
 973                         err = sock_intr_errno(timeo);
 974                         break;
 975                 }
 976         }
 977
 978         set_current_state(TASK_RUNNING);
 979         remove_wait_queue(sk_sleep(sk), &wait);
 980
 981         if (err)
 982                 goto done;
 983
 984         newsock->state = SS_CONNECTED;
 985
 986 done:
 987         release_sock(sk);
 988         return err;
 989 }
 990
 991 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr,
 992                              int *len, int peer)
 993 {
 994         struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr;
 995         struct sock *sk = sock->sk;
 996         struct iucv_sock *iucv = iucv_sk(sk);
 997
 998         addr->sa_family = AF_IUCV;
 999         *len = sizeof(struct sockaddr_iucv);
1000
1001         if (peer) {
1002                 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8);
1003                 memcpy(siucv->siucv_name, iucv->dst_name, 8);
1004         } else {
1005                 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8);
1006                 memcpy(siucv->siucv_name, iucv->src_name, 8);
1007         }
1008         memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port));
1009         memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr));
1010         memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid));
1011
1012         return 0;
1013 }
1014
1015 /**
1016  * iucv_send_iprm() - Send socket data in parameter list of an iucv message.
1017  * @path:       IUCV path
1018  * @msg:        Pointer to a struct iucv_message
1019  * @skb:        The socket data to send, skb->len MUST BE <= 7
1020  *
1021  * Send the socket data in the parameter list in the iucv message
1022  * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter
1023  * list and the socket data len at index 7 (last byte).
1024  * See also iucv_msg_length().
1025  *
1026  * Returns the error code from the iucv_message_send() call.
1027  */
1028 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg,
1029                           struct sk_buff *skb)
1030 {
1031         u8 prmdata[8];
1032
1033         memcpy(prmdata, (void *) skb->data, skb->len);
1034         prmdata[7] = 0xff - (u8) skb->len;
1035         return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0,
1036                                  (void *) prmdata, 8);
1037 }
1038
1039 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg,
1040                              size_t len)
1041 {
1042         struct sock *sk = sock->sk;
1043         struct iucv_sock *iucv = iucv_sk(sk);
1044         size_t headroom = 0;
1045         size_t linear;
1046         struct sk_buff *skb;
1047         struct iucv_message txmsg = {0};
1048         struct cmsghdr *cmsg;
1049         int cmsg_done;
1050         long timeo;
1051         char user_id[9];
1052         char appl_id[9];
1053         int err;
1054         int noblock = msg->msg_flags & MSG_DONTWAIT;
1055
1056         err = sock_error(sk);
1057         if (err)
1058                 return err;
1059
1060         if (msg->msg_flags & MSG_OOB)
1061                 return -EOPNOTSUPP;
1062
1063         /* SOCK_SEQPACKET: we do not support segmented records */
1064         if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR))
1065                 return -EOPNOTSUPP;
1066
1067         lock_sock(sk);
1068
1069         if (sk->sk_shutdown & SEND_SHUTDOWN) {
1070                 err = -EPIPE;
1071                 goto out;
1072         }
1073
1074         /* Return if the socket is not in connected state */
1075         if (sk->sk_state != IUCV_CONNECTED) {
1076                 err = -ENOTCONN;
1077                 goto out;
1078         }
1079
1080         /* initialize defaults */
1081         cmsg_done   = 0;        /* check for duplicate headers */
1082         txmsg.class = 0;
1083
1084         /* iterate over control messages */
1085         for_each_cmsghdr(cmsg, msg) {
1086                 if (!CMSG_OK(msg, cmsg)) {
1087                         err = -EINVAL;
1088                         goto out;
1089                 }
1090
1091                 if (cmsg->cmsg_level != SOL_IUCV)
1092                         continue;
1093
1094                 if (cmsg->cmsg_type & cmsg_done) {
1095                         err = -EINVAL;
1096                         goto out;
1097                 }
1098                 cmsg_done |= cmsg->cmsg_type;
1099
1100                 switch (cmsg->cmsg_type) {
1101                 case SCM_IUCV_TRGCLS:
1102                         if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
1103                                 err = -EINVAL;
1104                                 goto out;
1105                         }
1106
1107                         /* set iucv message target class */
1108                         memcpy(&txmsg.class,
1109                                 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
1110
1111                         break;
1112
1113                 default:
1114                         err = -EINVAL;
1115                         goto out;
1116                 }
1117         }
1118
1119         /* allocate one skb for each iucv message:
1120          * this is fine for SOCK_SEQPACKET (unless we want to support
1121          * segmented records using the MSG_EOR flag), but
1122          * for SOCK_STREAM we might want to improve it in future */
1123         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1124                 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN;
1125                 linear = len;
1126         } else {
1127                 if (len < PAGE_SIZE) {
1128                         linear = len;
1129                 } else {
1130                         /* In nonlinear "classic" iucv skb,
1131                          * reserve space for iucv_array
1132                          */
1133                         headroom = sizeof(struct iucv_array) *
1134                                    (MAX_SKB_FRAGS + 1);
1135                         linear = PAGE_SIZE - headroom;
1136                 }
1137         }
1138         skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear,
1139                                    noblock, &err, 0);
1140         if (!skb)
1141                 goto out;
1142         if (headroom)
1143                 skb_reserve(skb, headroom);
1144         skb_put(skb, linear);
1145         skb->len = len;
1146         skb->data_len = len - linear;
1147         err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len);
1148         if (err)
1149                 goto fail;
1150
1151         /* wait if outstanding messages for iucv path has reached */
1152         timeo = sock_sndtimeo(sk, noblock);
1153         err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
1154         if (err)
1155                 goto fail;
1156
1157         /* return -ECONNRESET if the socket is no longer connected */
1158         if (sk->sk_state != IUCV_CONNECTED) {
1159                 err = -ECONNRESET;
1160                 goto fail;
1161         }
1162
1163         /* increment and save iucv message tag for msg_completion cbk */
1164         txmsg.tag = iucv->send_tag++;
1165         IUCV_SKB_CB(skb)->tag = txmsg.tag;
1166
1167         if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1168                 atomic_inc(&iucv->msg_sent);
1169                 err = afiucv_hs_send(&txmsg, sk, skb, 0);
1170                 if (err) {
1171                         atomic_dec(&iucv->msg_sent);
1172                         goto fail;
1173                 }
1174         } else { /* Classic VM IUCV transport */
1175                 skb_queue_tail(&iucv->send_skb_q, skb);
1176
1177                 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) &&
1178                     skb->len <= 7) {
1179                         err = iucv_send_iprm(iucv->path, &txmsg, skb);
1180
1181                         /* on success: there is no message_complete callback */
1182                         /* for an IPRMDATA msg; remove skb from send queue   */
1183                         if (err == 0) {
1184                                 skb_unlink(skb, &iucv->send_skb_q);
1185                                 kfree_skb(skb);
1186                         }
1187
1188                         /* this error should never happen since the     */
1189                         /* IUCV_IPRMDATA path flag is set... sever path */
1190                         if (err == 0x15) {
1191                                 pr_iucv->path_sever(iucv->path, NULL);
1192                                 skb_unlink(skb, &iucv->send_skb_q);
1193                                 err = -EPIPE;
1194                                 goto fail;
1195                         }
1196                 } else if (skb_is_nonlinear(skb)) {
1197                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1198                         int i;
1199
1200                         /* skip iucv_array lying in the headroom */
1201                         iba[0].address = (u32)(addr_t)skb->data;
1202                         iba[0].length = (u32)skb_headlen(skb);
1203                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1204                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1205
1206                                 iba[i + 1].address =
1207                                         (u32)(addr_t)skb_frag_address(frag);
1208                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1209                         }
1210                         err = pr_iucv->message_send(iucv->path, &txmsg,
1211                                                     IUCV_IPBUFLST, 0,
1212                                                     (void *)iba, skb->len);
1213                 } else { /* non-IPRM Linear skb */
1214                         err = pr_iucv->message_send(iucv->path, &txmsg,
1215                                         0, 0, (void *)skb->data, skb->len);
1216                 }
1217                 if (err) {
1218                         if (err == 3) {
1219                                 user_id[8] = 0;
1220                                 memcpy(user_id, iucv->dst_user_id, 8);
1221                                 appl_id[8] = 0;
1222                                 memcpy(appl_id, iucv->dst_name, 8);
1223                                 pr_err(
1224                 "Application %s on z/VM guest %s exceeds message limit\n",
1225                                         appl_id, user_id);
1226                                 err = -EAGAIN;
1227                         } else {
1228                                 err = -EPIPE;
1229                         }
1230                         skb_unlink(skb, &iucv->send_skb_q);
1231                         goto fail;
1232                 }
1233         }
1234
1235         release_sock(sk);
1236         return len;
1237
1238 fail:
1239         kfree_skb(skb);
1240 out:
1241         release_sock(sk);
1242         return err;
1243 }
1244
1245 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len)
1246 {
1247         size_t headroom, linear;
1248         struct sk_buff *skb;
1249         int err;
1250
1251         if (len < PAGE_SIZE) {
1252                 headroom = 0;
1253                 linear = len;
1254         } else {
1255                 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1);
1256                 linear = PAGE_SIZE - headroom;
1257         }
1258         skb = alloc_skb_with_frags(headroom + linear, len - linear,
1259                                    0, &err, GFP_ATOMIC | GFP_DMA);
1260         WARN_ONCE(!skb,
1261                   "alloc of recv iucv skb len=%lu failed with errcode=%d\n",
1262                   len, err);
1263         if (skb) {
1264                 if (headroom)
1265                         skb_reserve(skb, headroom);
1266                 skb_put(skb, linear);
1267                 skb->len = len;
1268                 skb->data_len = len - linear;
1269         }
1270         return skb;
1271 }
1272
1273 /* iucv_process_message() - Receive a single outstanding IUCV message
1274  *
1275  * Locking: must be called with message_q.lock held
1276  */
1277 static void iucv_process_message(struct sock *sk, struct sk_buff *skb,
1278                                  struct iucv_path *path,
1279                                  struct iucv_message *msg)
1280 {
1281         int rc;
1282         unsigned int len;
1283
1284         len = iucv_msg_length(msg);
1285
1286         /* store msg target class in the second 4 bytes of skb ctrl buffer */
1287         /* Note: the first 4 bytes are reserved for msg tag */
1288         IUCV_SKB_CB(skb)->class = msg->class;
1289
1290         /* check for special IPRM messages (e.g. iucv_sock_shutdown) */
1291         if ((msg->flags & IUCV_IPRMDATA) && len > 7) {
1292                 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) {
1293                         skb->data = NULL;
1294                         skb->len = 0;
1295                 }
1296         } else {
1297                 if (skb_is_nonlinear(skb)) {
1298                         struct iucv_array *iba = (struct iucv_array *)skb->head;
1299                         int i;
1300
1301                         iba[0].address = (u32)(addr_t)skb->data;
1302                         iba[0].length = (u32)skb_headlen(skb);
1303                         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1304                                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1305
1306                                 iba[i + 1].address =
1307                                         (u32)(addr_t)skb_frag_address(frag);
1308                                 iba[i + 1].length = (u32)skb_frag_size(frag);
1309                         }
1310                         rc = pr_iucv->message_receive(path, msg,
1311                                               IUCV_IPBUFLST,
1312                                               (void *)iba, len, NULL);
1313                 } else {
1314                         rc = pr_iucv->message_receive(path, msg,
1315                                               msg->flags & IUCV_IPRMDATA,
1316                                               skb->data, len, NULL);
1317                 }
1318                 if (rc) {
1319                         kfree_skb(skb);
1320                         return;
1321                 }
1322                 WARN_ON_ONCE(skb->len != len);
1323         }
1324
1325         IUCV_SKB_CB(skb)->offset = 0;
1326         if (sk_filter(sk, skb)) {
1327                 atomic_inc(&sk->sk_drops);      /* skb rejected by filter */
1328                 kfree_skb(skb);
1329                 return;
1330         }
1331         if (__sock_queue_rcv_skb(sk, skb))      /* handle rcv queue full */
1332                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
1333 }
1334
1335 /* iucv_process_message_q() - Process outstanding IUCV messages
1336  *
1337  * Locking: must be called with message_q.lock held
1338  */
1339 static void iucv_process_message_q(struct sock *sk)
1340 {
1341         struct iucv_sock *iucv = iucv_sk(sk);
1342         struct sk_buff *skb;
1343         struct sock_msg_q *p, *n;
1344
1345         list_for_each_entry_safe(p, n, &iucv->message_q.list, list) {
1346                 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg));
1347                 if (!skb)
1348                         break;
1349                 iucv_process_message(sk, skb, p->path, &p->msg);
1350                 list_del(&p->list);
1351                 kfree(p);
1352                 if (!skb_queue_empty(&iucv->backlog_skb_q))
1353                         break;
1354         }
1355 }
1356
1357 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg,
1358                              size_t len, int flags)
1359 {
1360         int noblock = flags & MSG_DONTWAIT;
1361         struct sock *sk = sock->sk;
1362         struct iucv_sock *iucv = iucv_sk(sk);
1363         unsigned int copied, rlen;
1364         struct sk_buff *skb, *rskb, *cskb;
1365         int err = 0;
1366         u32 offset;
1367
1368         if ((sk->sk_state == IUCV_DISCONN) &&
1369             skb_queue_empty(&iucv->backlog_skb_q) &&
1370             skb_queue_empty(&sk->sk_receive_queue) &&
1371             list_empty(&iucv->message_q.list))
1372                 return 0;
1373
1374         if (flags & (MSG_OOB))
1375                 return -EOPNOTSUPP;
1376
1377         /* receive/dequeue next skb:
1378          * the function understands MSG_PEEK and, thus, does not dequeue skb */
1379         skb = skb_recv_datagram(sk, flags, noblock, &err);
1380         if (!skb) {
1381                 if (sk->sk_shutdown & RCV_SHUTDOWN)
1382                         return 0;
1383                 return err;
1384         }
1385
1386         offset = IUCV_SKB_CB(skb)->offset;
1387         rlen   = skb->len - offset;             /* real length of skb */
1388         copied = min_t(unsigned int, rlen, len);
1389         if (!rlen)
1390                 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN;
1391
1392         cskb = skb;
1393         if (skb_copy_datagram_msg(cskb, offset, msg, copied)) {
1394                 if (!(flags & MSG_PEEK))
1395                         skb_queue_head(&sk->sk_receive_queue, skb);
1396                 return -EFAULT;
1397         }
1398
1399         /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */
1400         if (sk->sk_type == SOCK_SEQPACKET) {
1401                 if (copied < rlen)
1402                         msg->msg_flags |= MSG_TRUNC;
1403                 /* each iucv message contains a complete record */
1404                 msg->msg_flags |= MSG_EOR;
1405         }
1406
1407         /* create control message to store iucv msg target class:
1408          * get the trgcls from the control buffer of the skb due to
1409          * fragmentation of original iucv message. */
1410         err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS,
1411                        sizeof(IUCV_SKB_CB(skb)->class),
1412                        (void *)&IUCV_SKB_CB(skb)->class);
1413         if (err) {
1414                 if (!(flags & MSG_PEEK))
1415                         skb_queue_head(&sk->sk_receive_queue, skb);
1416                 return err;
1417         }
1418
1419         /* Mark read part of skb as used */
1420         if (!(flags & MSG_PEEK)) {
1421
1422                 /* SOCK_STREAM: re-queue skb if it contains unreceived data */
1423                 if (sk->sk_type == SOCK_STREAM) {
1424                         if (copied < rlen) {
1425                                 IUCV_SKB_CB(skb)->offset = offset + copied;
1426                                 skb_queue_head(&sk->sk_receive_queue, skb);
1427                                 goto done;
1428                         }
1429                 }
1430
1431                 kfree_skb(skb);
1432                 if (iucv->transport == AF_IUCV_TRANS_HIPER) {
1433                         atomic_inc(&iucv->msg_recv);
1434                         if (atomic_read(&iucv->msg_recv) > iucv->msglimit) {
1435                                 WARN_ON(1);
1436                                 iucv_sock_close(sk);
1437                                 return -EFAULT;
1438                         }
1439                 }
1440
1441                 /* Queue backlog skbs */
1442                 spin_lock_bh(&iucv->message_q.lock);
1443                 rskb = skb_dequeue(&iucv->backlog_skb_q);
1444                 while (rskb) {
1445                         IUCV_SKB_CB(rskb)->offset = 0;
1446                         if (__sock_queue_rcv_skb(sk, rskb)) {
1447                                 /* handle rcv queue full */
1448                                 skb_queue_head(&iucv->backlog_skb_q,
1449                                                 rskb);
1450                                 break;
1451                         }
1452                         rskb = skb_dequeue(&iucv->backlog_skb_q);
1453                 }
1454                 if (skb_queue_empty(&iucv->backlog_skb_q)) {
1455                         if (!list_empty(&iucv->message_q.list))
1456                                 iucv_process_message_q(sk);
1457                         if (atomic_read(&iucv->msg_recv) >=
1458                                                         iucv->msglimit / 2) {
1459                                 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN);
1460                                 if (err) {
1461                                         sk->sk_state = IUCV_DISCONN;
1462                                         sk->sk_state_change(sk);
1463                                 }
1464                         }
1465                 }
1466                 spin_unlock_bh(&iucv->message_q.lock);
1467         }
1468
1469 done:
1470         /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */
1471         if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC))
1472                 copied = rlen;
1473
1474         return copied;
1475 }
1476
1477 static inline unsigned int iucv_accept_poll(struct sock *parent)
1478 {
1479         struct iucv_sock *isk, *n;
1480         struct sock *sk;
1481
1482         list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) {
1483                 sk = (struct sock *) isk;
1484
1485                 if (sk->sk_state == IUCV_CONNECTED)
1486                         return POLLIN | POLLRDNORM;
1487         }
1488
1489         return 0;
1490 }
1491
1492 unsigned int iucv_sock_poll(struct file *file, struct socket *sock,
1493                             poll_table *wait)
1494 {
1495         struct sock *sk = sock->sk;
1496         unsigned int mask = 0;
1497
1498         sock_poll_wait(file, sk_sleep(sk), wait);
1499
1500         if (sk->sk_state == IUCV_LISTEN)
1501                 return iucv_accept_poll(sk);
1502
1503         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
1504                 mask |= POLLERR |
1505                         (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0);
1506
1507         if (sk->sk_shutdown & RCV_SHUTDOWN)
1508                 mask |= POLLRDHUP;
1509
1510         if (sk->sk_shutdown == SHUTDOWN_MASK)
1511                 mask |= POLLHUP;
1512
1513         if (!skb_queue_empty(&sk->sk_receive_queue) ||
1514             (sk->sk_shutdown & RCV_SHUTDOWN))
1515                 mask |= POLLIN | POLLRDNORM;
1516
1517         if (sk->sk_state == IUCV_CLOSED)
1518                 mask |= POLLHUP;
1519
1520         if (sk->sk_state == IUCV_DISCONN)
1521                 mask |= POLLIN;
1522
1523         if (sock_writeable(sk) && iucv_below_msglim(sk))
1524                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1525         else
1526                 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
1527
1528         return mask;
1529 }
1530
1531 static int iucv_sock_shutdown(struct socket *sock, int how)
1532 {
1533         struct sock *sk = sock->sk;
1534         struct iucv_sock *iucv = iucv_sk(sk);
1535         struct iucv_message txmsg;
1536         int err = 0;
1537
1538         how++;
1539
1540         if ((how & ~SHUTDOWN_MASK) || !how)
1541                 return -EINVAL;
1542
1543         lock_sock(sk);
1544         switch (sk->sk_state) {
1545         case IUCV_LISTEN:
1546         case IUCV_DISCONN:
1547         case IUCV_CLOSING:
1548         case IUCV_CLOSED:
1549                 err = -ENOTCONN;
1550                 goto fail;
1551         default:
1552                 break;
1553         }
1554
1555         if ((how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) &&
1556             sk->sk_state == IUCV_CONNECTED) {
1557                 if (iucv->transport == AF_IUCV_TRANS_IUCV) {
1558                         txmsg.class = 0;
1559                         txmsg.tag = 0;
1560                         err = pr_iucv->message_send(iucv->path, &txmsg,
1561                                 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8);
1562                         if (err) {
1563                                 switch (err) {
1564                                 case 1:
1565                                         err = -ENOTCONN;
1566                                         break;
1567                                 case 2:
1568                                         err = -ECONNRESET;
1569                                         break;
1570                                 default:
1571                                         err = -ENOTCONN;
1572                                         break;
1573                                 }
1574                         }
1575                 } else
1576                         iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT);
1577         }
1578
1579         sk->sk_shutdown |= how;
1580         if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) {
1581                 if ((iucv->transport == AF_IUCV_TRANS_IUCV) &&
1582                     iucv->path) {
1583                         err = pr_iucv->path_quiesce(iucv->path, NULL);
1584                         if (err)
1585                                 err = -ENOTCONN;
1586 /*                      skb_queue_purge(&sk->sk_receive_queue); */
1587                 }
1588                 skb_queue_purge(&sk->sk_receive_queue);
1589         }
1590
1591         /* Wake up anyone sleeping in poll */
1592         sk->sk_state_change(sk);
1593
1594 fail:
1595         release_sock(sk);
1596         return err;
1597 }
1598
1599 static int iucv_sock_release(struct socket *sock)
1600 {
1601         struct sock *sk = sock->sk;
1602         int err = 0;
1603
1604         if (!sk)
1605                 return 0;
1606
1607         iucv_sock_close(sk);
1608
1609         sock_orphan(sk);
1610         iucv_sock_kill(sk);
1611         return err;
1612 }
1613
1614 /* getsockopt and setsockopt */
1615 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname,
1616                                 char __user *optval, unsigned int optlen)
1617 {
1618         struct sock *sk = sock->sk;
1619         struct iucv_sock *iucv = iucv_sk(sk);
1620         int val;
1621         int rc;
1622
1623         if (level != SOL_IUCV)
1624                 return -ENOPROTOOPT;
1625
1626         if (optlen < sizeof(int))
1627                 return -EINVAL;
1628
1629         if (get_user(val, (int __user *) optval))
1630                 return -EFAULT;
1631
1632         rc = 0;
1633
1634         lock_sock(sk);
1635         switch (optname) {
1636         case SO_IPRMDATA_MSG:
1637                 if (val)
1638                         iucv->flags |= IUCV_IPRMDATA;
1639                 else
1640                         iucv->flags &= ~IUCV_IPRMDATA;
1641                 break;
1642         case SO_MSGLIMIT:
1643                 switch (sk->sk_state) {
1644                 case IUCV_OPEN:
1645                 case IUCV_BOUND:
1646                         if (val < 1 || val > (u16)(~0))
1647                                 rc = -EINVAL;
1648                         else
1649                                 iucv->msglimit = val;
1650                         break;
1651                 default:
1652                         rc = -EINVAL;
1653                         break;
1654                 }
1655                 break;
1656         default:
1657                 rc = -ENOPROTOOPT;
1658                 break;
1659         }
1660         release_sock(sk);
1661
1662         return rc;
1663 }
1664
1665 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname,
1666                                 char __user *optval, int __user *optlen)
1667 {
1668         struct sock *sk = sock->sk;
1669         struct iucv_sock *iucv = iucv_sk(sk);
1670         unsigned int val;
1671         int len;
1672
1673         if (level != SOL_IUCV)
1674                 return -ENOPROTOOPT;
1675
1676         if (get_user(len, optlen))
1677                 return -EFAULT;
1678
1679         if (len < 0)
1680                 return -EINVAL;
1681
1682         len = min_t(unsigned int, len, sizeof(int));
1683
1684         switch (optname) {
1685         case SO_IPRMDATA_MSG:
1686                 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0;
1687                 break;
1688         case SO_MSGLIMIT:
1689                 lock_sock(sk);
1690                 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */
1691                                            : iucv->msglimit;    /* default */
1692                 release_sock(sk);
1693                 break;
1694         case SO_MSGSIZE:
1695                 if (sk->sk_state == IUCV_OPEN)
1696                         return -EBADFD;
1697                 val = (iucv->hs_dev) ? iucv->hs_dev->mtu -
1698                                 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN :
1699                                 0x7fffffff;
1700                 break;
1701         default:
1702                 return -ENOPROTOOPT;
1703         }
1704
1705         if (put_user(len, optlen))
1706                 return -EFAULT;
1707         if (copy_to_user(optval, &val, len))
1708                 return -EFAULT;
1709
1710         return 0;
1711 }
1712
1713
1714 /* Callback wrappers - called from iucv base support */
1715 static int iucv_callback_connreq(struct iucv_path *path,
1716                                  u8 ipvmid[8], u8 ipuser[16])
1717 {
1718         unsigned char user_data[16];
1719         unsigned char nuser_data[16];
1720         unsigned char src_name[8];
1721         struct sock *sk, *nsk;
1722         struct iucv_sock *iucv, *niucv;
1723         int err;
1724
1725         memcpy(src_name, ipuser, 8);
1726         EBCASC(src_name, 8);
1727         /* Find out if this path belongs to af_iucv. */
1728         read_lock(&iucv_sk_list.lock);
1729         iucv = NULL;
1730         sk = NULL;
1731         sk_for_each(sk, &iucv_sk_list.head)
1732                 if (sk->sk_state == IUCV_LISTEN &&
1733                     !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) {
1734                         /*
1735                          * Found a listening socket with
1736                          * src_name == ipuser[0-7].
1737                          */
1738                         iucv = iucv_sk(sk);
1739                         break;
1740                 }
1741         read_unlock(&iucv_sk_list.lock);
1742         if (!iucv)
1743                 /* No socket found, not one of our paths. */
1744                 return -EINVAL;
1745
1746         bh_lock_sock(sk);
1747
1748         /* Check if parent socket is listening */
1749         low_nmcpy(user_data, iucv->src_name);
1750         high_nmcpy(user_data, iucv->dst_name);
1751         ASCEBC(user_data, sizeof(user_data));
1752         if (sk->sk_state != IUCV_LISTEN) {
1753                 err = pr_iucv->path_sever(path, user_data);
1754                 iucv_path_free(path);
1755                 goto fail;
1756         }
1757
1758         /* Check for backlog size */
1759         if (sk_acceptq_is_full(sk)) {
1760                 err = pr_iucv->path_sever(path, user_data);
1761                 iucv_path_free(path);
1762                 goto fail;
1763         }
1764
1765         /* Create the new socket */
1766         nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1767         if (!nsk) {
1768                 err = pr_iucv->path_sever(path, user_data);
1769                 iucv_path_free(path);
1770                 goto fail;
1771         }
1772
1773         niucv = iucv_sk(nsk);
1774         iucv_sock_init(nsk, sk);
1775
1776         /* Set the new iucv_sock */
1777         memcpy(niucv->dst_name, ipuser + 8, 8);
1778         EBCASC(niucv->dst_name, 8);
1779         memcpy(niucv->dst_user_id, ipvmid, 8);
1780         memcpy(niucv->src_name, iucv->src_name, 8);
1781         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
1782         niucv->path = path;
1783
1784         /* Call iucv_accept */
1785         high_nmcpy(nuser_data, ipuser + 8);
1786         memcpy(nuser_data + 8, niucv->src_name, 8);
1787         ASCEBC(nuser_data + 8, 8);
1788
1789         /* set message limit for path based on msglimit of accepting socket */
1790         niucv->msglimit = iucv->msglimit;
1791         path->msglim = iucv->msglimit;
1792         err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk);
1793         if (err) {
1794                 iucv_sever_path(nsk, 1);
1795                 iucv_sock_kill(nsk);
1796                 goto fail;
1797         }
1798
1799         iucv_accept_enqueue(sk, nsk);
1800
1801         /* Wake up accept */
1802         nsk->sk_state = IUCV_CONNECTED;
1803         sk->sk_data_ready(sk);
1804         err = 0;
1805 fail:
1806         bh_unlock_sock(sk);
1807         return 0;
1808 }
1809
1810 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16])
1811 {
1812         struct sock *sk = path->private;
1813
1814         sk->sk_state = IUCV_CONNECTED;
1815         sk->sk_state_change(sk);
1816 }
1817
1818 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg)
1819 {
1820         struct sock *sk = path->private;
1821         struct iucv_sock *iucv = iucv_sk(sk);
1822         struct sk_buff *skb;
1823         struct sock_msg_q *save_msg;
1824         int len;
1825
1826         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1827                 pr_iucv->message_reject(path, msg);
1828                 return;
1829         }
1830
1831         spin_lock(&iucv->message_q.lock);
1832
1833         if (!list_empty(&iucv->message_q.list) ||
1834             !skb_queue_empty(&iucv->backlog_skb_q))
1835                 goto save_message;
1836
1837         len = atomic_read(&sk->sk_rmem_alloc);
1838         len += SKB_TRUESIZE(iucv_msg_length(msg));
1839         if (len > sk->sk_rcvbuf)
1840                 goto save_message;
1841
1842         skb = alloc_iucv_recv_skb(iucv_msg_length(msg));
1843         if (!skb)
1844                 goto save_message;
1845
1846         iucv_process_message(sk, skb, path, msg);
1847         goto out_unlock;
1848
1849 save_message:
1850         save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA);
1851         if (!save_msg)
1852                 goto out_unlock;
1853         save_msg->path = path;
1854         save_msg->msg = *msg;
1855
1856         list_add_tail(&save_msg->list, &iucv->message_q.list);
1857
1858 out_unlock:
1859         spin_unlock(&iucv->message_q.lock);
1860 }
1861
1862 static void iucv_callback_txdone(struct iucv_path *path,
1863                                  struct iucv_message *msg)
1864 {
1865         struct sock *sk = path->private;
1866         struct sk_buff *this = NULL;
1867         struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q;
1868         struct sk_buff *list_skb = list->next;
1869         unsigned long flags;
1870
1871         bh_lock_sock(sk);
1872         if (!skb_queue_empty(list)) {
1873                 spin_lock_irqsave(&list->lock, flags);
1874
1875                 while (list_skb != (struct sk_buff *)list) {
1876                         if (msg->tag == IUCV_SKB_CB(list_skb)->tag) {
1877                                 this = list_skb;
1878                                 break;
1879                         }
1880                         list_skb = list_skb->next;
1881                 }
1882                 if (this)
1883                         __skb_unlink(this, list);
1884
1885                 spin_unlock_irqrestore(&list->lock, flags);
1886
1887                 if (this) {
1888                         kfree_skb(this);
1889                         /* wake up any process waiting for sending */
1890                         iucv_sock_wake_msglim(sk);
1891                 }
1892         }
1893
1894         if (sk->sk_state == IUCV_CLOSING) {
1895                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
1896                         sk->sk_state = IUCV_CLOSED;
1897                         sk->sk_state_change(sk);
1898                 }
1899         }
1900         bh_unlock_sock(sk);
1901
1902 }
1903
1904 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16])
1905 {
1906         struct sock *sk = path->private;
1907
1908         if (sk->sk_state == IUCV_CLOSED)
1909                 return;
1910
1911         bh_lock_sock(sk);
1912         iucv_sever_path(sk, 1);
1913         sk->sk_state = IUCV_DISCONN;
1914
1915         sk->sk_state_change(sk);
1916         bh_unlock_sock(sk);
1917 }
1918
1919 /* called if the other communication side shuts down its RECV direction;
1920  * in turn, the callback sets SEND_SHUTDOWN to disable sending of data.
1921  */
1922 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16])
1923 {
1924         struct sock *sk = path->private;
1925
1926         bh_lock_sock(sk);
1927         if (sk->sk_state != IUCV_CLOSED) {
1928                 sk->sk_shutdown |= SEND_SHUTDOWN;
1929                 sk->sk_state_change(sk);
1930         }
1931         bh_unlock_sock(sk);
1932 }
1933
1934 /***************** HiperSockets transport callbacks ********************/
1935 static void afiucv_swap_src_dest(struct sk_buff *skb)
1936 {
1937         struct af_iucv_trans_hdr *trans_hdr =
1938                                 (struct af_iucv_trans_hdr *)skb->data;
1939         char tmpID[8];
1940         char tmpName[8];
1941
1942         ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
1943         ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
1944         ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
1945         ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
1946         memcpy(tmpID, trans_hdr->srcUserID, 8);
1947         memcpy(tmpName, trans_hdr->srcAppName, 8);
1948         memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8);
1949         memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8);
1950         memcpy(trans_hdr->destUserID, tmpID, 8);
1951         memcpy(trans_hdr->destAppName, tmpName, 8);
1952         skb_push(skb, ETH_HLEN);
1953         memset(skb->data, 0, ETH_HLEN);
1954 }
1955
1956 /**
1957  * afiucv_hs_callback_syn - react on received SYN
1958  **/
1959 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb)
1960 {
1961         struct sock *nsk;
1962         struct iucv_sock *iucv, *niucv;
1963         struct af_iucv_trans_hdr *trans_hdr;
1964         int err;
1965
1966         iucv = iucv_sk(sk);
1967         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
1968         if (!iucv) {
1969                 /* no sock - connection refused */
1970                 afiucv_swap_src_dest(skb);
1971                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1972                 err = dev_queue_xmit(skb);
1973                 goto out;
1974         }
1975
1976         nsk = iucv_sock_alloc(NULL, sk->sk_protocol, GFP_ATOMIC, 0);
1977         bh_lock_sock(sk);
1978         if ((sk->sk_state != IUCV_LISTEN) ||
1979             sk_acceptq_is_full(sk) ||
1980             !nsk) {
1981                 /* error on server socket - connection refused */
1982                 afiucv_swap_src_dest(skb);
1983                 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN;
1984                 err = dev_queue_xmit(skb);
1985                 iucv_sock_kill(nsk);
1986                 bh_unlock_sock(sk);
1987                 goto out;
1988         }
1989
1990         niucv = iucv_sk(nsk);
1991         iucv_sock_init(nsk, sk);
1992         niucv->transport = AF_IUCV_TRANS_HIPER;
1993         niucv->msglimit = iucv->msglimit;
1994         if (!trans_hdr->window)
1995                 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT;
1996         else
1997                 niucv->msglimit_peer = trans_hdr->window;
1998         memcpy(niucv->dst_name, trans_hdr->srcAppName, 8);
1999         memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8);
2000         memcpy(niucv->src_name, iucv->src_name, 8);
2001         memcpy(niucv->src_user_id, iucv->src_user_id, 8);
2002         nsk->sk_bound_dev_if = sk->sk_bound_dev_if;
2003         niucv->hs_dev = iucv->hs_dev;
2004         dev_hold(niucv->hs_dev);
2005         afiucv_swap_src_dest(skb);
2006         trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK;
2007         trans_hdr->window = niucv->msglimit;
2008         /* if receiver acks the xmit connection is established */
2009         err = dev_queue_xmit(skb);
2010         if (!err) {
2011                 iucv_accept_enqueue(sk, nsk);
2012                 nsk->sk_state = IUCV_CONNECTED;
2013                 sk->sk_data_ready(sk);
2014         } else
2015                 iucv_sock_kill(nsk);
2016         bh_unlock_sock(sk);
2017
2018 out:
2019         return NET_RX_SUCCESS;
2020 }
2021
2022 /**
2023  * afiucv_hs_callback_synack() - react on received SYN-ACK
2024  **/
2025 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb)
2026 {
2027         struct iucv_sock *iucv = iucv_sk(sk);
2028         struct af_iucv_trans_hdr *trans_hdr =
2029                                         (struct af_iucv_trans_hdr *)skb->data;
2030
2031         if (!iucv)
2032                 goto out;
2033         if (sk->sk_state != IUCV_BOUND)
2034                 goto out;
2035         bh_lock_sock(sk);
2036         iucv->msglimit_peer = trans_hdr->window;
2037         sk->sk_state = IUCV_CONNECTED;
2038         sk->sk_state_change(sk);
2039         bh_unlock_sock(sk);
2040 out:
2041         kfree_skb(skb);
2042         return NET_RX_SUCCESS;
2043 }
2044
2045 /**
2046  * afiucv_hs_callback_synfin() - react on received SYN_FIN
2047  **/
2048 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb)
2049 {
2050         struct iucv_sock *iucv = iucv_sk(sk);
2051
2052         if (!iucv)
2053                 goto out;
2054         if (sk->sk_state != IUCV_BOUND)
2055                 goto out;
2056         bh_lock_sock(sk);
2057         sk->sk_state = IUCV_DISCONN;
2058         sk->sk_state_change(sk);
2059         bh_unlock_sock(sk);
2060 out:
2061         kfree_skb(skb);
2062         return NET_RX_SUCCESS;
2063 }
2064
2065 /**
2066  * afiucv_hs_callback_fin() - react on received FIN
2067  **/
2068 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb)
2069 {
2070         struct iucv_sock *iucv = iucv_sk(sk);
2071
2072         /* other end of connection closed */
2073         if (!iucv)
2074                 goto out;
2075         bh_lock_sock(sk);
2076         if (sk->sk_state == IUCV_CONNECTED) {
2077                 sk->sk_state = IUCV_DISCONN;
2078                 sk->sk_state_change(sk);
2079         }
2080         bh_unlock_sock(sk);
2081 out:
2082         kfree_skb(skb);
2083         return NET_RX_SUCCESS;
2084 }
2085
2086 /**
2087  * afiucv_hs_callback_win() - react on received WIN
2088  **/
2089 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb)
2090 {
2091         struct iucv_sock *iucv = iucv_sk(sk);
2092         struct af_iucv_trans_hdr *trans_hdr =
2093                                         (struct af_iucv_trans_hdr *)skb->data;
2094
2095         if (!iucv)
2096                 return NET_RX_SUCCESS;
2097
2098         if (sk->sk_state != IUCV_CONNECTED)
2099                 return NET_RX_SUCCESS;
2100
2101         atomic_sub(trans_hdr->window, &iucv->msg_sent);
2102         iucv_sock_wake_msglim(sk);
2103         return NET_RX_SUCCESS;
2104 }
2105
2106 /**
2107  * afiucv_hs_callback_rx() - react on received data
2108  **/
2109 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb)
2110 {
2111         struct iucv_sock *iucv = iucv_sk(sk);
2112
2113         if (!iucv) {
2114                 kfree_skb(skb);
2115                 return NET_RX_SUCCESS;
2116         }
2117
2118         if (sk->sk_state != IUCV_CONNECTED) {
2119                 kfree_skb(skb);
2120                 return NET_RX_SUCCESS;
2121         }
2122
2123         if (sk->sk_shutdown & RCV_SHUTDOWN) {
2124                 kfree_skb(skb);
2125                 return NET_RX_SUCCESS;
2126         }
2127
2128         /* write stuff from iucv_msg to skb cb */
2129         skb_pull(skb, sizeof(struct af_iucv_trans_hdr));
2130         skb_reset_transport_header(skb);
2131         skb_reset_network_header(skb);
2132         IUCV_SKB_CB(skb)->offset = 0;
2133         if (sk_filter(sk, skb)) {
2134                 atomic_inc(&sk->sk_drops);      /* skb rejected by filter */
2135                 kfree_skb(skb);
2136                 return NET_RX_SUCCESS;
2137         }
2138
2139         spin_lock(&iucv->message_q.lock);
2140         if (skb_queue_empty(&iucv->backlog_skb_q)) {
2141                 if (__sock_queue_rcv_skb(sk, skb))
2142                         /* handle rcv queue full */
2143                         skb_queue_tail(&iucv->backlog_skb_q, skb);
2144         } else
2145                 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb);
2146         spin_unlock(&iucv->message_q.lock);
2147         return NET_RX_SUCCESS;
2148 }
2149
2150 /**
2151  * afiucv_hs_rcv() - base function for arriving data through HiperSockets
2152  *                   transport
2153  *                   called from netif RX softirq
2154  **/
2155 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev,
2156         struct packet_type *pt, struct net_device *orig_dev)
2157 {
2158         struct sock *sk;
2159         struct iucv_sock *iucv;
2160         struct af_iucv_trans_hdr *trans_hdr;
2161         char nullstring[8];
2162         int err = 0;
2163
2164         if (skb->len < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr))) {
2165                 WARN_ONCE(1, "AF_IUCV too short skb, len=%d, min=%d",
2166                           (int)skb->len,
2167                           (int)(ETH_HLEN + sizeof(struct af_iucv_trans_hdr)));
2168                 kfree_skb(skb);
2169                 return NET_RX_SUCCESS;
2170         }
2171         if (skb_headlen(skb) < (ETH_HLEN + sizeof(struct af_iucv_trans_hdr)))
2172                 if (skb_linearize(skb)) {
2173                         WARN_ONCE(1, "AF_IUCV skb_linearize failed, len=%d",
2174                                   (int)skb->len);
2175                         kfree_skb(skb);
2176                         return NET_RX_SUCCESS;
2177                 }
2178         skb_pull(skb, ETH_HLEN);
2179         trans_hdr = (struct af_iucv_trans_hdr *)skb->data;
2180         EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName));
2181         EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID));
2182         EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName));
2183         EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID));
2184         memset(nullstring, 0, sizeof(nullstring));
2185         iucv = NULL;
2186         sk = NULL;
2187         read_lock(&iucv_sk_list.lock);
2188         sk_for_each(sk, &iucv_sk_list.head) {
2189                 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) {
2190                         if ((!memcmp(&iucv_sk(sk)->src_name,
2191                                      trans_hdr->destAppName, 8)) &&
2192                             (!memcmp(&iucv_sk(sk)->src_user_id,
2193                                      trans_hdr->destUserID, 8)) &&
2194                             (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) &&
2195                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2196                                      nullstring, 8))) {
2197                                 iucv = iucv_sk(sk);
2198                                 break;
2199                         }
2200                 } else {
2201                         if ((!memcmp(&iucv_sk(sk)->src_name,
2202                                      trans_hdr->destAppName, 8)) &&
2203                             (!memcmp(&iucv_sk(sk)->src_user_id,
2204                                      trans_hdr->destUserID, 8)) &&
2205                             (!memcmp(&iucv_sk(sk)->dst_name,
2206                                      trans_hdr->srcAppName, 8)) &&
2207                             (!memcmp(&iucv_sk(sk)->dst_user_id,
2208                                      trans_hdr->srcUserID, 8))) {
2209                                 iucv = iucv_sk(sk);
2210                                 break;
2211                         }
2212                 }
2213         }
2214         read_unlock(&iucv_sk_list.lock);
2215         if (!iucv)
2216                 sk = NULL;
2217
2218         /* no sock
2219         how should we send with no sock
2220         1) send without sock no send rc checking?
2221         2) introduce default sock to handle this cases
2222
2223          SYN -> send SYN|ACK in good case, send SYN|FIN in bad case
2224          data -> send FIN
2225          SYN|ACK, SYN|FIN, FIN -> no action? */
2226
2227         switch (trans_hdr->flags) {
2228         case AF_IUCV_FLAG_SYN:
2229                 /* connect request */
2230                 err = afiucv_hs_callback_syn(sk, skb);
2231                 break;
2232         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK):
2233                 /* connect request confirmed */
2234                 err = afiucv_hs_callback_synack(sk, skb);
2235                 break;
2236         case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN):
2237                 /* connect request refused */
2238                 err = afiucv_hs_callback_synfin(sk, skb);
2239                 break;
2240         case (AF_IUCV_FLAG_FIN):
2241                 /* close request */
2242                 err = afiucv_hs_callback_fin(sk, skb);
2243                 break;
2244         case (AF_IUCV_FLAG_WIN):
2245                 err = afiucv_hs_callback_win(sk, skb);
2246                 if (skb->len == sizeof(struct af_iucv_trans_hdr)) {
2247                         kfree_skb(skb);
2248                         break;
2249                 }
2250                 /* fall through and receive non-zero length data */
2251         case (AF_IUCV_FLAG_SHT):
2252                 /* shutdown request */
2253                 /* fall through and receive zero length data */
2254         case 0:
2255                 /* plain data frame */
2256                 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class;
2257                 err = afiucv_hs_callback_rx(sk, skb);
2258                 break;
2259         default:
2260                 ;
2261         }
2262
2263         return err;
2264 }
2265
2266 /**
2267  * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets
2268  *                                 transport
2269  **/
2270 static void afiucv_hs_callback_txnotify(struct sk_buff *skb,
2271                                         enum iucv_tx_notify n)
2272 {
2273         struct sock *isk = skb->sk;
2274         struct sock *sk = NULL;
2275         struct iucv_sock *iucv = NULL;
2276         struct sk_buff_head *list;
2277         struct sk_buff *list_skb;
2278         struct sk_buff *nskb;
2279         unsigned long flags;
2280
2281         read_lock_irqsave(&iucv_sk_list.lock, flags);
2282         sk_for_each(sk, &iucv_sk_list.head)
2283                 if (sk == isk) {
2284                         iucv = iucv_sk(sk);
2285                         break;
2286                 }
2287         read_unlock_irqrestore(&iucv_sk_list.lock, flags);
2288
2289         if (!iucv || sock_flag(sk, SOCK_ZAPPED))
2290                 return;
2291
2292         list = &iucv->send_skb_q;
2293         spin_lock_irqsave(&list->lock, flags);
2294         if (skb_queue_empty(list))
2295                 goto out_unlock;
2296         list_skb = list->next;
2297         nskb = list_skb->next;
2298         while (list_skb != (struct sk_buff *)list) {
2299                 if (skb_shinfo(list_skb) == skb_shinfo(skb)) {
2300                         switch (n) {
2301                         case TX_NOTIFY_OK:
2302                                 __skb_unlink(list_skb, list);
2303                                 kfree_skb(list_skb);
2304                                 iucv_sock_wake_msglim(sk);
2305                                 break;
2306                         case TX_NOTIFY_PENDING:
2307                                 atomic_inc(&iucv->pendings);
2308                                 break;
2309                         case TX_NOTIFY_DELAYED_OK:
2310                                 __skb_unlink(list_skb, list);
2311                                 atomic_dec(&iucv->pendings);
2312                                 if (atomic_read(&iucv->pendings) <= 0)
2313                                         iucv_sock_wake_msglim(sk);
2314                                 kfree_skb(list_skb);
2315                                 break;
2316                         case TX_NOTIFY_UNREACHABLE:
2317                         case TX_NOTIFY_DELAYED_UNREACHABLE:
2318                         case TX_NOTIFY_TPQFULL: /* not yet used */
2319                         case TX_NOTIFY_GENERALERROR:
2320                         case TX_NOTIFY_DELAYED_GENERALERROR:
2321                                 __skb_unlink(list_skb, list);
2322                                 kfree_skb(list_skb);
2323                                 if (sk->sk_state == IUCV_CONNECTED) {
2324                                         sk->sk_state = IUCV_DISCONN;
2325                                         sk->sk_state_change(sk);
2326                                 }
2327                                 break;
2328                         }
2329                         break;
2330                 }
2331                 list_skb = nskb;
2332                 nskb = nskb->next;
2333         }
2334 out_unlock:
2335         spin_unlock_irqrestore(&list->lock, flags);
2336
2337         if (sk->sk_state == IUCV_CLOSING) {
2338                 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) {
2339                         sk->sk_state = IUCV_CLOSED;
2340                         sk->sk_state_change(sk);
2341                 }
2342         }
2343
2344 }
2345
2346 /*
2347  * afiucv_netdev_event: handle netdev notifier chain events
2348  */
2349 static int afiucv_netdev_event(struct notifier_block *this,
2350                                unsigned long event, void *ptr)
2351 {
2352         struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
2353         struct sock *sk;
2354         struct iucv_sock *iucv;
2355
2356         switch (event) {
2357         case NETDEV_REBOOT:
2358         case NETDEV_GOING_DOWN:
2359                 sk_for_each(sk, &iucv_sk_list.head) {
2360                         iucv = iucv_sk(sk);
2361                         if ((iucv->hs_dev == event_dev) &&
2362                             (sk->sk_state == IUCV_CONNECTED)) {
2363                                 if (event == NETDEV_GOING_DOWN)
2364                                         iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN);
2365                                 sk->sk_state = IUCV_DISCONN;
2366                                 sk->sk_state_change(sk);
2367                         }
2368                 }
2369                 break;
2370         case NETDEV_DOWN:
2371         case NETDEV_UNREGISTER:
2372         default:
2373                 break;
2374         }
2375         return NOTIFY_DONE;
2376 }
2377
2378 static struct notifier_block afiucv_netdev_notifier = {
2379         .notifier_call = afiucv_netdev_event,
2380 };
2381
2382 static const struct proto_ops iucv_sock_ops = {
2383         .family         = PF_IUCV,
2384         .owner          = THIS_MODULE,
2385         .release        = iucv_sock_release,
2386         .bind           = iucv_sock_bind,
2387         .connect        = iucv_sock_connect,
2388         .listen         = iucv_sock_listen,
2389         .accept         = iucv_sock_accept,
2390         .getname        = iucv_sock_getname,
2391         .sendmsg        = iucv_sock_sendmsg,
2392         .recvmsg        = iucv_sock_recvmsg,
2393         .poll           = iucv_sock_poll,
2394         .ioctl          = sock_no_ioctl,
2395         .mmap           = sock_no_mmap,
2396         .socketpair     = sock_no_socketpair,
2397         .shutdown       = iucv_sock_shutdown,
2398         .setsockopt     = iucv_sock_setsockopt,
2399         .getsockopt     = iucv_sock_getsockopt,
2400 };
2401
2402 static const struct net_proto_family iucv_sock_family_ops = {
2403         .family = AF_IUCV,
2404         .owner  = THIS_MODULE,
2405         .create = iucv_sock_create,
2406 };
2407
2408 static struct packet_type iucv_packet_type = {
2409         .type = cpu_to_be16(ETH_P_AF_IUCV),
2410         .func = afiucv_hs_rcv,
2411 };
2412
2413 static int afiucv_iucv_init(void)
2414 {
2415         int err;
2416
2417         err = pr_iucv->iucv_register(&af_iucv_handler, 0);
2418         if (err)
2419                 goto out;
2420         /* establish dummy device */
2421         af_iucv_driver.bus = pr_iucv->bus;
2422         err = driver_register(&af_iucv_driver);
2423         if (err)
2424                 goto out_iucv;
2425         af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
2426         if (!af_iucv_dev) {
2427                 err = -ENOMEM;
2428                 goto out_driver;
2429         }
2430         dev_set_name(af_iucv_dev, "af_iucv");
2431         af_iucv_dev->bus = pr_iucv->bus;
2432         af_iucv_dev->parent = pr_iucv->root;
2433         af_iucv_dev->release = (void (*)(struct device *))kfree;
2434         af_iucv_dev->driver = &af_iucv_driver;
2435         err = device_register(af_iucv_dev);
2436         if (err)
2437                 goto out_iucv_dev;
2438         return 0;
2439
2440 out_iucv_dev:
2441         put_device(af_iucv_dev);
2442 out_driver:
2443         driver_unregister(&af_iucv_driver);
2444 out_iucv:
2445         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2446 out:
2447         return err;
2448 }
2449
2450 static void afiucv_iucv_exit(void)
2451 {
2452         device_unregister(af_iucv_dev);
2453         driver_unregister(&af_iucv_driver);
2454         pr_iucv->iucv_unregister(&af_iucv_handler, 0);
2455 }
2456
2457 static int __init afiucv_init(void)
2458 {
2459         int err;
2460
2461         if (MACHINE_IS_VM) {
2462                 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err);
2463                 if (unlikely(err)) {
2464                         WARN_ON(err);
2465                         err = -EPROTONOSUPPORT;
2466                         goto out;
2467                 }
2468
2469                 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv");
2470                 if (!pr_iucv) {
2471                         printk(KERN_WARNING "iucv_if lookup failed\n");
2472                         memset(&iucv_userid, 0, sizeof(iucv_userid));
2473                 }
2474         } else {
2475                 memset(&iucv_userid, 0, sizeof(iucv_userid));
2476                 pr_iucv = NULL;
2477         }
2478
2479         err = proto_register(&iucv_proto, 0);
2480         if (err)
2481                 goto out;
2482         err = sock_register(&iucv_sock_family_ops);
2483         if (err)
2484                 goto out_proto;
2485
2486         if (pr_iucv) {
2487                 err = afiucv_iucv_init();
2488                 if (err)
2489                         goto out_sock;
2490         }
2491
2492         err = register_netdevice_notifier(&afiucv_netdev_notifier);
2493         if (err)
2494                 goto out_notifier;
2495
2496         dev_add_pack(&iucv_packet_type);
2497         return 0;
2498
2499 out_notifier:
2500         if (pr_iucv)
2501                 afiucv_iucv_exit();
2502 out_sock:
2503         sock_unregister(PF_IUCV);
2504 out_proto:
2505         proto_unregister(&iucv_proto);
2506 out:
2507         if (pr_iucv)
2508                 symbol_put(iucv_if);
2509         return err;
2510 }
2511
2512 static void __exit afiucv_exit(void)
2513 {
2514         if (pr_iucv) {
2515                 afiucv_iucv_exit();
2516                 symbol_put(iucv_if);
2517         }
2518
2519         unregister_netdevice_notifier(&afiucv_netdev_notifier);
2520         dev_remove_pack(&iucv_packet_type);
2521         sock_unregister(PF_IUCV);
2522         proto_unregister(&iucv_proto);
2523 }
2524
2525 module_init(afiucv_init);
2526 module_exit(afiucv_exit);
2527
2528 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>");
2529 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION);
2530 MODULE_VERSION(VERSION);
2531 MODULE_LICENSE("GPL");
2532 MODULE_ALIAS_NETPROTO(PF_IUCV);
2533